JP2000055797A - Tensile strength-testing equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent drive that can be easily measured and inspected at a site and does not require any drive means by providing a drive control means for stopping the drive means based on the detection result of a detection means. SOLUTION: Testing equipment applies tensile force to a base material 19 where a screw member 17 is mounted in a direction for pulling the screw member 17 from the base material 19 to measure the tensile force. Then, the testing equipment is provided with a seating attachment 7 for touching the base material 19, a motor 30 for rotating the seating attachment 7, a tensile shaft 9 for pulling the screw member 17 while the tensile shaft 9 is screwed to the screw member 17 of the base material 19, a strain gauge 6C for measuring tensile force being generated by the tensile shaft 9, a storage means for storing a specific value, a comparison means for comparing a value that is measured by the strain gauge 6C with a set value being stored in the storage means, and a detection means for detecting a rupture value that indicates that the screw member 17 has been removed from the base material 19, and a drive control means for stopping the drive means based on the detection result of the detection means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tensile strength tester, and more particularly to a tensile strength tester capable of measuring a tensile strength when a screw member is pulled out from a base material to which the screw member is attached.

[0002]

2. Description of the Related Art Generally, when a screw portion is formed on a resin-formed product or a thin plate and other members are screwed together, in order to obtain a sufficient strength of these joined portions, the screw portion is formed as a separate member with a base material. For example, it is used as an insert nut for resin, a press caulking nut, or a welding nut by embedding, welding, press fitting, or the like. by the way,
Since the screw member joined to the base material as a separate member ensures the strength of the joint, it is necessary to conduct a joint strength test between the base material and the screw member. In the bond strength test, the base material is fixed, a tensile force is applied to the screw member, and the maximum bond strength, that is, the tensile force between the base material and the screw member, A tensile strength tester for measuring the strength is used.

As a conventional tensile strength tester of this type, for example, there is one as shown in FIG. In FIG.
Reference numeral 1 denotes a pull-out strength tester, for which, for example, an Amsler tensile tester is used although not shown in detail. An object to be measured 103 formed by injection molding is engaged with the fixing portion 102 of the pull-out strength tester 101, and a screw member 105 is embedded in a base material 104 of the object to be measured 103. That is, the DUT 103 has the base member 104 together with the screw member 105.
It is cut out in advance to a size that can be attached to 2. At the time of measurement, a bolt 106 is screwed into the screw member 105, and the pull-down fitting 107 of the pull-out strength tester 101 is screwed to the bolt 106.
Is engaged with the tension fitting 107 in the upward direction in the figure, that is, the DUT 103 supported by the fixing portion 102.
A tensile force in the direction of pulling out the screw member 105 is applied. Then, when the tensile force is increased, the screw member 105 is separated from the base material 104 and falls off, and the pull-out strength of the base material 104 and the screw member 105 is measured from the tensile force at the start of separation.

[0004]

However, in such a conventional tensile strength tester, since the pull-out strength tester 101 is a stationary Amsler tensile tester or the like, the following problems arise. there were.

That is, it is necessary to cut out the DUT 103 in advance in accordance with the fixed portion 102 to have a specific shape, so that the preparation work for the measurement becomes complicated, the setup takes time, and the measurement requires skill. . Furthermore, since the test device is a general-purpose device, there is a problem that it is expensive. Moreover, since the pull-out strength tester 101 is large and stationary, it is almost impossible to measure the pull-out strength of the base material 104 and the screw member 105 at the site of injection molding or the like. There was a problem of doing.

In particular, the measurement of the pull-out strength is intended to improve the quality by feeding back the measurement result to the product production process, and a pull-out strength tester which can be easily measured and inspected on site is demanded. Was.

It is an object of the present invention to provide a tensile strength tester which can be easily measured and inspected on site and can prevent unnecessary driving of the driving means.

[0008]

To achieve the above object, a tensile strength tester according to claim 1 applies a tensile force to a base material to which a screw member is attached in a direction in which the screw member is pulled out from the base material. In the tensile strength tester for measuring the tensile force, a contact means for contacting the base material, a driving means for rotating the contact means, and screwed to a screw member of the base material Tension means for pulling the screw member, measurement means for measuring the tensile force generated by the tension means, storage means for storing a predetermined value, and the measured value measured by the measurement means Comparison means for comparing the set value stored in the storage means, detection means for detecting a break value indicating that the screw member has been removed from the base material, and based on a detection result of the detection means The driving means is stopped It is characterized by comprising a drive control unit that.

A tensile strength tester according to a second aspect of the present invention is the tensile strength tester according to the first aspect, further comprising display means for displaying the breaking value.

A tensile strength tester according to a third aspect of the present invention is the tensile strength tester according to the first aspect, wherein the screw member detached from the base material screwed to the tension means is removed from the tension means. It is characterized by having removing means.

A tensile strength tester according to a fourth aspect of the present invention provides a tensile strength test for measuring a tensile force by applying a tensile force to a base material to which a screw member is attached in a direction in which the screw member is pulled out from the base material. A measuring unit, an arithmetic unit, and a driving unit, wherein: 1) the measuring unit is engaged with a tensioned portion having a threaded portion formed at a distal end thereof and a proximal end of the tensioned portion; By rotating, the rotating portion for screwing the pulling portion to the screw member, the fixing portion rotatably holding the pulling portion and abutting against the base material, the pulling portion A measuring unit for measuring a tensile force generated by being screwed into the screw member; 2) the arithmetic unit includes a storage unit for storing a measured value measured by the measuring unit as needed; Is a rupture value that is substantially zero. And a determination unit for constant for 3) wherein the drive unit includes a drive unit, a drive transmitting part for transmitting the driving force generated by the driving unit to the rotating unit,
A drive control unit that stops driving the drive unit when the determination unit determines that the measured value is the breakage value.

A tensile strength tester according to a fifth aspect of the present invention is the tensile strength tester according to the fourth aspect, further comprising a display unit for visually or audibly recognizing the fracture value determined by the determination unit. It is characterized by having.

According to a sixth aspect of the present invention, in the tensile strength tester according to the fourth aspect, the fixing portion has an outer cylindrical portion and a seating attachment that comes into contact with the base material, And the outer cylinder part are screwed together,
The seat attachment is movable along a direction in which the pulling force is generated with respect to the outer cylindrical portion, and an inner surface shape of the seat attachment is substantially the same as an outer surface shape of the screw member. I have.

According to a seventh aspect of the present invention, there is provided a tensile strength tester according to the sixth aspect, wherein the threaded shape of the seat attachment and the outer cylindrical portion is different from the threaded shape at the tip of the tensile portion. Is characterized by being formed in a reverse screw.

According to a tenth aspect of the present invention, in the tensile strength tester according to the fourth aspect, the rotating part and the tensile part are connected by screwing each other. I have.

According to a ninth aspect of the present invention, in the tensile strength tester according to the fourth aspect, the rotating portion has a hollow body and a rotating connecting portion connected to the tensile portion. And
The pulling portion has a pulling connection portion on the base end side, and the rotating connection portion is disposed below the trunk along the axis of the pulling portion, and the pulling portion is inserted through the trunk. The rotation connecting portion and the pulling connecting portion are connected to each other.

According to a tenth aspect of the present invention, in the tensile strength tester according to the fourth aspect, the measuring section includes a strain gauge for measuring a deformation in a thrust direction and a thin-walled section to which the strain gauge is attached. And a contact portion that is in contact with the rotating portion via a bearing, and a fixing portion that is fixed to the outer cylinder member.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. (1) (Embodiment of Tensile Strength Tester for Applying Rotational Force with Knob) Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In addition, in order to avoid redundant and complicated description, the same configuration,
Similar components are denoted by common reference numerals, and description thereof is omitted.

FIG. 1 is a front sectional view showing a tensile strength tester according to a first embodiment of the present invention, in which a rotary force is applied by a knob. As shown in FIG. 1, a tensile strength tester 1 according to the first embodiment includes a handle 2 as a knob, a rotating shaft 3 as a hollow drive shaft fixed to the handle 2 with a set screw 14b. An outer cylindrical member 5 for rotatably holding the rotating shaft 3 via a single-row deep groove ball bearing 4 as a radial bearing, and a small screw 16 coaxially with the outer cylindrical member 5 at the lower end of the outer cylindrical member 5. Compression type load converter 6 fixed through
A seating attachment 7 which is detachably screwed to the lower end of the rotary shaft 3 coaxially with the outer cylinder member 5, a driving plate 8 with a hexagonal hole fixed to the lower end of the rotating shaft 3 via a small screw 16, and a hexagonal hole. Tension shaft 9 in which hexagonal head 9a is fitted into hexagonal hole 8a of drive plate 8
A thrust needle roller bearing 11, which is a thrust bearing for rotatably holding the pulling shaft 9 on the load converter 6 via the pedestal 10, and a center hole 2a of the handle portion 2, which is screwed to the rotating shaft. 3
, A stopper plug 12 that is inserted into the central hole 3a of the tension shaft 9 and abuts the hexagonal head 9a of the tension shaft 9, a receptacle connector 15 that extracts an electric signal from the load converter 6, and an electrical component connected to the electrode of the receptacle connector 15. 25 (see FIG. 2).

In the present embodiment, an object to be measured by the tensile strength tester 1 is, for example, a welding nut which is a screw member 17 welded to a steel plate 19 as a base material. The pull-out strength of the screw member 17 as the object to be measured is measured by the tensile strength tester 1.

The seating attachment 7 is formed with a concave portion 7a having an inner diameter D in the axial direction and a hole 7b through which the tension shaft 9 is loosely inserted in communication with the concave portion 7a. The inner diameter D of the concave portion 7a is set to be larger than the maximum outer diameter d of the screw member 17, and when the tensile strength tester 1 measures the pull-out strength of the object to be measured, the seating portion 7c of the seating attachment 7
Is configured to abut on the upper surface of the steel plate 19 at the outer periphery. That is, the seat attachment 7 is
The tensile strength tester 1 is seated on the upper surface of the steel plate 19,
Has a function as a seating portion for supporting In addition, since the seating attachments 7 having various inner diameters are prepared and the seating attachments 7 are detachably provided on the load converter 6, the seating attachments corresponding to the maximum outer diameter of the screw member 17 can be easily provided. 7 can be exchanged. Further, since the seat attachment 7 is screwed to the load converter 6, by rotating the seat attachment 7, the protruding height from the load converter 6 can be arbitrarily adjusted.

A tension shaft having a shaft portion 9b having a threaded portion 9c at the distal end and a hexagonal head 9a having a larger diameter than the shaft portion 9b provided at the base end of the shaft portion 9b is provided in a hole 7b of the seating attachment 7. 9 is coaxially inserted with the seat attachment 7. The shaft portion 9b of the tension shaft 9 penetrates through the seating attachment 7, and the screw portion 9c at the distal end is screwed to the screw member 17 of the object to be measured, and the hexagonal head 9a at the base end portion of the driving plate 8 with a hexagonal hole. It is fitted in the hexagonal hole 8a. Then, the rotating power transmitted to the driving plate 8 with hexagonal holes is transmitted to the tension shaft 9.

The rotating shaft 3 to which the driving plate 8 with hexagonal holes is fixed is rotatably held via the upper and lower single row deep groove ball bearings 4 as described above, and is mounted on the upper ball bearing 4. Is provided with a seal ring 13 for preventing entry of foreign matter.
The center hole 3a of the rotating shaft 3 is a hexagonal head 9a of the pulling shaft 9.
And the pulling shaft 9a is configured to be freely inserted and removed from the center hole 3a.

The rotating shaft 3 is provided with a set screw 14
b, when the handle 2 is rotated,
The turning power of the handle part 2 is transmitted to the rotating shaft 3. Then, the rotating power of the rotating shaft 3 is transmitted to the driving plate 8 with a hexagonal hole, and the rotating power of the driving plate 8 with a hexagonal hole is transmitted to the tension shaft 9. As a result, the tension shaft 9 includes the hexagonal head 9a of the tension shaft 9, the pedestal 10,
While applying a reaction force to the steel plate 19 via the roller bearing 11, the load converter 6, and the seat attachment 7, a tensile force corresponding to the rotation angle is applied to the welding nut 17.

Like the seat attachment 7, the tension shaft 9 is prepared by forming a male screw having a screw thread of various sizes on a screw portion 9c at the tip thereof. From the center hole 3 of the rotating shaft 3
Since the tension shaft 9 can be pulled out from a, it is possible to easily replace the tension shaft 9 with the screw diameter of the screw member 17 that matches the screw diameter.

The thrust bearing 1 on the upper surface of the load transducer 6
Since the roller bearing 1 is a roller bearing, it has excellent durability even when a large load is applied. When a large load is not applied, a ball bearing may be used. Also, a tapered roller bearing can be used.

By disposing a thick base 10 having a predetermined thickness between the thrust bearing 11 and the lower surface of the hexagonal head 9a of the tension shaft 9, the diameter of the hexagonal head 9a of the tension shaft 9 is reduced. When the contact area between the hexagonal head 9a and the thrust bearing 11 is small, it is possible to prevent the local load from acting on the thrust bearing 11 when the maximum outer diameter is smaller than the maximum outer diameter. That is, the stress propagates at an angle of 45 degrees by interposing the thick pedestal 10, so that the load uniformly acts on the thrust bearing 11. Therefore, by interposing the thick base 10, the hexagonal head 9 a of the tension shaft 9 is formed.
Can be reduced, and the size and weight can be reduced.

The outer tubular member 5 constitutes the body of the tensile strength tester 1 and is formed in a hollow tubular shape with an appropriate thickness that can be gripped by one hand by an adult.

A load converter 6 is provided at the lower end of the outer cylinder member 5.
Has been fixed. The load transducer 6 is screwed and fixed to the outer cylinder member 5 via a small screw 16 at a first flange 6d formed at the lower end in the figure, and is thrust-fastened at a second flange 6a formed at the upper end. It is in contact with the lower surface of the hexagonal head 9a of the tension shaft 9 via the bearing 11 and the base 10. Thereby, it is configured to receive a reaction force of the tensile force generated in the tensile shaft 9 as a compressive force. In addition, the first flange portion 6
A sensing portion 6b as a thin portion elastically deformed by receiving the compressive force is provided integrally with the second flange portion 6d and the second flange portion 6a, and the compressive force is applied to the sensing portion 6b. Four strain gauges 6c, which are strain sensors as measuring means for measuring the strain of the sensing portion 6b when receiving the signal, are attached at four locations around the circumference at equal intervals, and are converted into electric signals by a bridge circuit as shown in FIG. Measure the load. In the present embodiment, the sensitivity is increased by using the sensing portion 6b as a thin portion, and a space for disposing the strain gauge 6c is secured.

The sensing portion 6b includes a first flange portion 6d,
Since the second flange portion 6a and the sensing portion 6b are screwed and fixed to the outer cylinder member 5 as an integral cylindrical body, the first flange portion 6d and the second flange portion 6a are formed as a part of the outer cylinder member 5. It constitutes a thin portion provided between them. The strain gauge 6c is provided on the sensing part 6b of the load converter 6, and measures the tensile force acting on the tensile shaft 9 from the amount of strain (deformation) in the thrust direction.

In this embodiment, since the receptacle connector 15 is arranged near the strain gauge 6c, the wiring in the measuring instrument can be shortened. FIG. 2 is a block diagram of the electrical unit for this measurement. When the sensing section 6b is compressed and elastically deformed, the strain gauge 6c outputs an electric signal proportional to the distortion rate of the sensing section 6b, and the output signal of the strain sensor 6c, which is a strain gauge, is intermediate. The signal is input to the electrical unit 25 via a terminal and wiring having a shield structure. The electrical unit 25 is a microcomputer, an amplifier 1
5b, a control unit 15 including a peak hold circuit 15c, etc.
a, an A / D conversion unit 15d and a digital display unit 15e, amplifying the electric signal output from the strain gauge 6c, converting the electric signal into a digital signal, holding the peak, and displaying the peak value on the digital display unit 15e at all times. It has become.

Next, the operation of the above embodiment will be described. First, the tensile shaft 9 having a screw diameter suitable for the screw member 17 to be measured is attached to the tensile strength tester 1 in advance. For this attachment, first, the stopper plug 12 is removed from the handle portion 2, then the tension shaft 9 is inserted into the center hole 3a of the rotating shaft 3 from the distal end side, and then the hexagonal head 9a on the base end side is hexagonal. The stopper plate 12 is fitted into the hexagonal hole 8 a of the drive plate 8 with a hole, and then the stopper plug 12 is screwed into the handle 2, and the tip end of the stopper plug 12 is brought into contact with the hexagonal head 9 a of the tension shaft 9. Thereby, the axial movement of the tension shaft 9 can be prevented.

At the time of measurement, the seating part of the seating attachment 7 of the tensile strength tester 1 is brought into contact with the upper surface of the steel plate 19 of the object to be measured, and then the handle part 2 is rotated so that the tip of the tensile shaft 9 is screwed. 17 screw. When the handle 2 is further rotated and the rotation angle of the tension shaft 9 gradually increases from the rotation angle when the seating attachment 7 contacts the steel plate 19,
Due to the screw action between the distal end portion and the screw member 17, a tensile force in the direction of pulling out the screw member 17, which is proportional to the rotation angle, is applied to the screw member 17. At this time, a seating attachment 7 having an inner diameter larger than the maximum outer diameter of the screw member 17 is attached to the load converter 6 in advance, and the tension shaft 9 is coaxial with the seating attachment 7, so that the seating portion of the seating attachment 7 Automatically comes into close contact with the steel plate 19 at the outer periphery of the screw member 17 and supports the reaction force of the tension shaft 9 via the load transducer 6, the thrust bearing 11, the pedestal 10, and the hexagonal head 9a of the tension shaft 9. Then, the reaction force of the pulling force generated in the pulling shaft 9 is transmitted to the second flange portion 6d of the load converter 6 in the reverse order of the above-described members, and is equal to the pulling force of the screw member 17 in the sensing portion 6b. A reverse compression force is applied. At this time, the thrust bearing 11 acts to reduce the rotational load on the handle 2.

The sensible portion 6b of the load converter 6 is compressed and deformed in the axial direction by the tensile force generated on the tensile shaft 9, and accordingly, an electric signal proportional to the tensile force of the screw member 17 is generated by the strain gauge 6c. Is connected to the electrical unit 25 via the intermediate terminal and the wiring.
(See FIG. 2), the electric signal is amplified by the amplifier 15b of the electrical unit 25, is further converted into a digital value, is displayed on the display unit 15e so as to be directly readable, and the tensile force in the direction of pulling out the screw member 17 is obtained. Can be measured.

When the handle portion 2 is further rotated, the tensile force finally becomes greater than the joining force between the steel plate 19 and the screw member 17, and the screw member 17 starts to come off the steel plate 19. At this time, the tensile force P becomes the maximum value (extraction force) and can be read by the display unit 15e of the electrical unit 25 having the peak hold function. That is, the pull-out strength of the measured object can be measured immediately at the work site. By forming a lubricating film such as oily or liquid Teflon on the threaded portion 9c at the tip of the tension shaft 9 and the threaded portion of the screw member 17 of the object to be measured, a large pulling force P can be obtained with a small turning force of the handle. This can occur, and the life of the tension shaft 9 used repeatedly can be extended.

As described above, in the present embodiment, the seating portion of the seating attachment 7 is brought into contact with the upper surface of the steel plate 19 around the screw member 17 to support the tensile strength tester 1 and to fix the distal end of the tensile shaft 9. It is screwed into the screw member 17, and the grip portion 2 is rotated to apply a tensile force P to the screw member 17, and the tension shaft 9
Of the load transducer 6 provided between the hexagonal head 9a and the seating attachment 7 is compressed and deformed in the axial direction, and the maximum tensile force of the screw member 17 by the strain gauge 6c and the electrical component 25, that is, Measure pullout strength.

Further, the seat attachment 7 and the tension shaft 9 can be attached to and detached from the tensile strength tester 1 so as to correspond to the shape and dimensions of the screw member 17 without exchanging the handle portion 2. Can be easily carried, and there is no need to cut out the screw member 17 from the steel plate 19, so that the strength of the object to be measured can be easily measured at the work site.

Further, in the present embodiment, the amount of deformation is measured by the strain gauge 6c using the sensing portion 6b as a thin elastic deformation portion, so that a very small measuring instrument having a simple configuration is realized. be able to. Moreover, since the wiring from the load transducer 6 to the electrical component 25 is provided in the outer cylinder member 5 while having a shield structure, it is possible to improve noise resistance and prevent disconnection during work. The reliability can be greatly improved, and the operability of the measuring instrument can be extremely improved.

FIG. 23 is a view showing a modification of the load converter 6 of the present invention. In the figure, reference numeral 141 denotes a tubular load converter of a tension type. The load converter 141 is a thin portion having a middle portion 142 and a strain for measuring the strain (deformation) of the middle portion 142 in the thrust direction. And a gauge 126. One end of the load converter 141 is connected to a screw 144 via a first flange portion 143 formed integrally with the intermediate portion 142.
The main body 111 is fixed to the upper part of the main body 111. The first flange portion 143 is provided with a step portion 143a formed coaxially with the main body portion 111 so that the first flange portion 143 can be smoothly fitted to the inner periphery 111a of the main body portion 111. Is fixed to the body 111, the load converter 141 is automatically positioned coaxially with the tension shaft 117. The other end of the load converter 141 is provided integrally with the intermediate portion 142 from the second flange portion 145 having a cap shape, and the lower end of the transmission shaft 146 is in contact with the upper surface of the second flange portion 145. The transmission shaft 146 is formed in a hollow cylindrical shape, is coaxially inserted into the load converter 141, and the tension shaft 117 smoothly penetrates the inner periphery. In the present embodiment,
Although the lower end of the conduction shaft 146 is configured to abut on the upper surface of the second flange 145, as shown in FIG.
The lower end of the transmission shaft 146 may be configured to be screwed to the second flange portion 145 of the load converter 141, and in any case, the transmission shaft 146 is provided to be coaxial with the load converter 141. Anything can be used.
On the other hand, a flange 146 a is formed at the upper end of the transmission shaft 146, and the flange 146 a and the first part of the load converter 141 are formed.
The height of the cylindrical portion 146 b of the transmission shaft 146 is set to be larger than the inner depth of the load converter 141 so that a gap of a predetermined size is provided between the flange portions 143. Further, a rotation preventing pin or the like can be implanted in the first flange portion 143, and the pin can be engaged with the flange portion 146a of the transmission shaft 146 to prevent the rotation with the tension shaft 117. 147 is a flange 146a of the transmission shaft 146.
The thrust bearing is disposed between the handle 118 and the handle 118 so that the transmission shaft 146 and the thrust bearing 147 do not fall off the main body 111 by a not-shown retaining ring or the like, and further, the thrust bearing 147 can rotate smoothly. It is positioned and fixed to body trunk 111. That is,
First flange portion 143, intermediate portion 14 of load converter 141
2 and the second flange 145 are integrally formed with the main body 1
11, and the intermediate portion 142 is attached to the main body 111.
(A thin portion of the outer cylinder member).

According to such a configuration, the seating surface 113b of the seating attachment 113 is
When the handle 118 is rotated around the screw member 116 and the handle 118 is rotated, the tension shaft 117 is rotated and the tip 117a is screwed into the screw member 116. A tensile force P in the direction of pulling out from the base material 115 is applied. The reaction force of the pulling force P generated on the pulling shaft 117 is transmitted to the second flange portion 145 of the load converter 141 via the pulling shaft 117, the thrust bearing 147, and the transmission shaft 146, and the first flange portion 143 is connected to the main body 1
11, the screw member 1 is attached to the intermediate portion 142.
A tensile force equal to 16 tensile forces P acts. Therefore, when the tension shaft 117 is rotated and a tensile force P corresponding to the rotation angle θ is applied to the screw member 116, the intermediate portion 142 of the load converter 141 is deformed in the axial direction by receiving a tensile force equal to the tensile force P. I do. The plurality of strain gauges 126 attached to the outer periphery of the intermediate portion 142 are deformed by receiving a tensile force, and output an electric signal proportional to the tensile force P to the electrical component section 130.
Other configurations and operations are the same as those of the above-described embodiment, and the same effects can be obtained in this embodiment.

Further, in the tensile strength tester 1 shown in FIG. 1, a stopper plug 12 is inserted into the hollow portion 3a of the rotating shaft 3 and screwed to the handle portion 2 to prevent the pulling shaft 9 from coming off upward. I'm preventing. In addition, a seating attachment 7 having an inner diameter larger than the maximum outer diameter of the member to be measured (for example, a welding nut) is screwed into the remaining end of the load converter 6 that supports the tensile peeling force via the thrust bearing 11. . For this reason, the screw member 17
The seating attachment 7 can be easily replaced according to the nominal diameter of the nut. The rotating shaft 3 is supported by a single-row deep groove ball bearing 4 coaxially with the outer cylindrical member 5 so as not to move freely in the axial direction.

In the tensile strength tester according to the first embodiment, a metal base material such as an iron plate or a plastic base material such as ABS is welded, caulked, press-fitted, or integrally molded and screwed into a nut or bolt. A screw portion 9c is provided at the distal end to apply a pulling force (axial force) based on the principle of a female screw to the nut and the bolt.
A tension shaft 9 having a hexagonal head 9a that receives a reaction force of a tension force (axial force) via a thrust bearing 11 is rotatably provided at a rotation center of the rotation force, and receives a rotation force of the tension shaft 9. The tension shaft 9 is fitted to the load portion to apply a rotational force to the tension shaft 9.
Since the hollow rotary shaft 3 having an inner diameter larger than the maximum outer diameter of the hexagonal head 9a is rotatably provided coaxially with the tension shaft 9, the tension shaft 9 is not loosened and the nominal diameter of the object to be measured. Changes,
The attachment and detachment of the tension shaft due to wear, breakage, and the like of the tension shaft 9 can be quickly performed.

FIG. 3 is a perspective view of a tensile strength tester according to a second embodiment, cut along a plane including an axis. The tensile strength tester 21 of the second embodiment differs from the tensile strength tester 1 of the first embodiment in that the position of the receptacle connector 15 is provided near the handle. When the position of the receptacle connector 15 is provided near the handle as described above, even when the screw member 17 is arranged in a narrow space such as the depth of a hole, when the receptacle connector 15 is inserted, Since the receptacle connector 15 does not become an obstacle, it is possible to measure up to a portion having a diameter close to the diameter of the outer cylinder member 5.

In the tensile strength tester 1 shown in FIG. 1, a driving plate 8 having a hexagonal hole 8a provided at the center thereof with a hexagonal head 9a of a tensioning shaft 9 is fixed to a tip of the rotating shaft 3 with a screw 16. However, in this case, a bottom may be integrally formed at the tip of the rotating shaft 3 and a driving hole (a hexagonal hole in this case) may be provided at the center of the bottom.
The drive hole is not limited to a hexagon, and may have any shape as long as a rotational force can be given.

FIGS. 4A and 4B are views showing a tensile strength tester according to the third embodiment, wherein FIG. 4A is a perspective view cut along a plane including a shaft, FIG. 4B is an enlarged perspective view of a main part, and FIG. It is a perspective view of a modification. FIG. 5 is a diagram showing the fourth embodiment, and FIG.
3 is a perspective view cut along a plane including the shaft, and FIG. 3B is an enlarged perspective view of the tension shaft.

For example, as shown in FIG.
Is a hexagon socket head cap screw having a hexagonal hole 39d at the head 39a and a screw portion 39c at the tip of the shaft portion.
A hexagonal rod 38 having a convex portion 38a that fits into the hexagonal hole 39d of the hexagonal bolt 39 at the tip of the bolt 39 may be provided on the center of rotation. In this case, the shape of the hole is not limited to the hexagon as described above. For example, as shown in FIG. 4C, a groove 49d of the head 49a and a rotating shaft 3 that engages with the groove 49d.
It may be a combination with a protrusion (not shown) on the third side. Also,
As shown in FIG. 5, the head 49a of the tension shaft 49 is defined as a notch circle, and the recess fitted into the notch circle is formed as a driving plate 48.
May be provided. As these effects, there is no looseness of the tension shaft 49 and the replacement is easy, and a rotational force can be easily applied to the tension shaft 49.

FIG. 6 is a perspective view of a tensile strength tester according to a fifth embodiment cut along a plane including an axis. In the tensile strength tester 51 of the fifth embodiment, instead of gripping the outer cylindrical member 5, the outer cylindrical member 5 has a grip portion 5 protruding in the radial direction.
1a, a wire is passed through the inside of the grip portion 51a,
Since the receptacle connector 15 is provided at the end of the grip portion 51a, it is easier to operate and a larger load can be applied as compared with the tensile strength tester of the embodiment of FIGS.

7 to 9 are views showing a tensile strength tester according to a sixth embodiment. FIG. 7 is a front sectional view, and FIG. 8 is cut along a plane including a shaft with a ratchet handle removed. FIG. 9 is a perspective view cut along a plane including a shaft with a ratchet handle mounted.

In the tensile strength tester 61 of the sixth embodiment, similarly to the knob-type tensile strength tester of FIG. 1, a strain gauge 6c is attached to a member supporting the tensile shaft 9 via the thrust bearing 4, and the tensile force is measured. Although the compression force is detected and output as a voltage as a reaction force, the elastic deformation of the head of the tension shaft 9 may be detected and output with a displacement meter or the like.

In the case of the tensile strength tester of the sixth embodiment, similarly to the tensile strength tester of FIG. 1, the tip of the hollow rotary shaft 63 for giving a rotational driving force is connected to the hexagonal head 9a of the tensile shaft 9. It has a hexagonal hole so as to provide a rotational force when fitted, and the head of the tension shaft 9 has a hexagonal head. The hollow portion of the rotating shaft 63 has a size through which the tension shaft 9 can freely pass.

In the tensile strength tester of FIG. 7, similarly to the tensile strength tester of FIG. Although the screw is fixed to the tip, the bottom may be integrally formed at the tip of the rotating shaft 63 and a driving hole (in this case, a hexagonal hole) may be provided at the center of the bottom. The drive hole is not limited to a hexagon, and may have any shape as long as a rotational force can be given. For example, if the tension shaft 9 is a hexagon socket head bolt, a hexagonal rod that fits into the hexagon socket of the hexagon socket head bolt may be provided at the tip of the rotating shaft 63 on the center of rotation. In this case, the shape of the hole is not limited to the hexagon as described above. As these effects, there is no loosening of the tension shaft, the replacement is easy, and a rotating force can be easily applied to the tension shaft.

In the tensile strength tester shown in FIG. 7, similarly to the tensile strength tester shown in FIG. 1, the stopper plug 12 is screwed into the hollow portion of the rotating shaft 63 to prevent the pulling shaft 9 from falling off. In. In addition, the remaining end of the member 6 that supports the tensile peel force via the thrust bearing 11 has a member to be measured (for example,
A seating attachment 7 having a sleeve having an inner diameter larger than the maximum outer diameter of the welding nut) is screwed. For this reason,
The sleeve can be easily changed according to the nominal diameter of the nut.
The rotating shaft 9 is supported by a single row deep groove ball bearing coaxially with the main body so as not to move freely in the axial direction, similarly to the tensile strength tester 1 of FIG.

In the pull-out strength measuring device shown in FIG. 7, the base end of the rotating shaft 63 fitted to the ratchet handle 51a has a hexagonal shape. Good, ratchet handle 5
When a one-way bearing is provided at the rotation center of 1a, it may be a circle fitted with this one-way bearing.

In the case of the tensile strength tester 61 shown in FIG. 7, the main body is supported by the handle 51a so that a large rotational force can be given, and the rotational force is given by the ratchet handle 61a. A tensile peel force can be easily generated.

The present invention can also be used for detecting the pull-out force of a resin insert nut, press caulking nut, or welding nut. As an application field, the present invention can also be used for measuring the removal force of a bearing pressed into a gear or a sprocket.

A strain gauge is attached to a member that supports the tension shaft via a thrust bearing, and a compression force is detected as a reaction force of the tension force and output as a voltage. As shown in FIG.
The amount of elastic deformation of the head 9 a of the tension shaft 9 may be detected by the displacement meter 76 or the like and output 75. As the displacement meter 76, for example, an eddy current displacement sensor can be used. The principle of the eddy current displacement sensor is that when a metal such as iron is placed within a high frequency time, eddy current is generated by electromagnetic induction according to the magnetic field and distance on the metal surface, and the eddy current generated itself Since it generates a magnetic field in the opposite direction to the magnetic field (Lenz's law),
When a metal such as iron approaches the high frequency magnetic field,
This has the effect of reducing the strength of the magnetic field. Therefore, the distance between the metal and the sensor 76a can be known by measuring the degree to which the metal such as iron approaches the sensor (high-frequency generating coil) and the original magnetic field is canceled out and becomes weak. .

(2) (Embodiment relating to motor drive) Hereinafter, an embodiment relating to motor drive of the present invention will be described with reference to the drawings. In the following second to fourth embodiments, only portions different from the first embodiment will be described, and the other portions are the same as the first embodiment.

FIG. 11 is a front sectional view showing a tensile strength tester according to an eighth embodiment of the present invention, and FIG. 12 is a side view showing the tensile strength tester. It was configured to be provided by driving means.

As shown in FIGS. 11 and 12, the tensile strength tester 1 according to the eighth embodiment comprises a body 5 of a cover member 5.
a handle part 2 which is a grip part protruding to the side of a, a motor 20 which is driving means housed in the handle part 2,
A drive shaft provided on the motor 20 and having a worm at the tip, a rotation shaft 3 having a worm gear on the outer periphery, and the rotation shaft 3 rotatably via a single row deep groove ball bearing 4 which is a radial bearing. Cover member 5 to be held, and trunk portion 5 of cover member 5
a (compressor) load converter 6 fixed coaxially to the body 5a below the outer cylinder member, and a seating attachment detachably screwed coaxially to the lower end of the load converter 6 coaxially with the load converter. 7, a driving plate 8 having a hexagonal hole fixed to the lower end of the rotating shaft 3 via a small screw 16, and a tension shaft 9 having a hexagonal head 9a fitted in a hexagonal hole 8a of the driving plate 8 having a hexagonal hole. A thrust needle roller bearing 11, which is a thrust bearing for rotatably holding the tension shaft 9 on the load converter 6 via the pedestal 10, and a rotating shaft 3
A stopper plug 12 that is inserted into the center hole 3a of the tension shaft 9 and contacts the hexagonal head 9a of the tension shaft 9, a holding lid that contacts the stopper plug 12, a power supply to the motor 20, and an electric signal from the load converter 6. Receptacle connector 15 for taking out, and electrical unit 25 connected to the electrode of receptacle connector 15
(See FIG. 13).

As shown in FIGS. 20A and 20B,
The handle part 2 has a handle member 118c that can project radially outward by rotating in the direction perpendicular to the axis thereof.
If necessary, the handle member 118c is rotated around the pin 118d, so that a sufficient operating torque can be secured. The handle member 118c of the handle portion 2 may be as shown in FIG. 21, or may be a shaft member or the like housed in the handle portion 2 so as to be able to protrude and retract radially outward.

An on / off switch for driving means is mounted near the body of the cover member. Since the on / off switch is arranged near the body in this manner, the force pressing the switch acts near the center of gravity, so that the tensile strength tester can be prevented from moving due to the force pressing the switch.

The bearings are provided at a predetermined distance from each other in the direction of the rotation axis, and a worm gear of driving force transmitting means is arranged between these bearings so as to suppress the generation of a thrust load. The center of gravity of the tensile strength tester is configured to be located between the bearings.

Since the worm gear is arranged between the bearings as described above, it is possible to prevent the vibration caused by the coaxial rotation and to suppress the generation of the thrust load. In addition, it is desirable that the center of gravity of the tester be arranged between the bearings.

In the present embodiment, the object to be measured by the tensile strength tester 1 is, for example, a welding nut which is a screw member 17 welded 18 to a steel plate 19. The tensile strength of the DUT 17 is measured by the tensile strength tester 1.

The seat attachment 7 is formed with a hole 7a which penetrates in the axial direction and into which the tension shaft 9 is loosely inserted.
The inner diameter D of the hole 7a is set to be larger than the maximum outer diameter d of the screw member 17, and when the tensile strength tester 1 measures the tensile strength of the object to be measured, the seating portion 7c of the seating attachment 7
Are configured to contact the upper surface of the steel plate 19 at the outer periphery of the screw member 17. That is, the seat attachment 7
Has a function as a seating portion for supporting the steel plate 19 by sitting the tensile strength tester 1 on the upper surface of the steel plate 19 at the time of measurement. In addition, since the seating attachments 7 having various inner diameters are prepared and the seating attachments 7 are detachably provided on the load converter 6, the seating attachments corresponding to the maximum outer diameter of the screw member 17 can be easily provided. 7 can be exchanged. Further, since the seat attachment 7 is screwed to the load converter 6, by rotating the seat attachment 7, the protruding height from the load converter 6 can be arbitrarily adjusted.

A tension shaft having a shaft portion 9b having a screw portion 9c at the tip and a hexagonal head 9a having a larger diameter than the shaft portion 9b provided at the base end of the shaft portion 9b is provided in the hole 7a of the seat attachment 7. 9 is coaxially inserted with the seat attachment 7. The shaft portion 9b of the tension shaft 9 penetrates through the seating attachment 7, and the screw portion 9c at the distal end is screwed to the screw member 17 of the object to be measured, and the hexagonal head 9a at the base end portion of the driving plate 8 with a hexagonal hole. It is fitted in the hexagonal hole 8a. Then, the rotating power transmitted to the driving plate 8 with hexagonal holes is transmitted to the tension shaft 9.

The center hole 3a of the rotating shaft 3 to which the hexagonal holed driving plate 8 is fixed has a diameter larger than the maximum outer diameter of the hexagonal head 9a of the tension shaft 9, and the center hole 3a extends from the center hole 3a. 9a
Are configured to be freely insertable and removable.

When the drive shaft 14, the worm 14a and the worm gear 3b are turned by the drive of the motor 20, the turning shaft 3 transmits the turning power. Then, the rotating power of the rotating shaft 3 is transmitted to the driving plate 8 with a hexagonal hole, and the rotating power of the driving plate 8 with a hexagonal hole is transmitted to the tension shaft 9. Thus, the tension shaft 9 applies a reaction force to the steel plate 19 via the hexagonal head 9 a of the tension shaft 9, the pedestal 10, the roller bearing 11, the load converter 6, and the seating attachment 7, and the tension according to the rotation angle. A force is applied to the welding nut 17.

As described above, since the worm gear device is used as the driving force transmitting means, a load of several ton class can be applied to the member to be measured, and the size of the motor 20 can be reduced.

The tension shaft 9 is prepared in the same manner as the seating attachment 7 in that male screws having various sizes of screw diameters are formed in the screw portion 9c at the distal end, and the stopper plug 12 is connected to the knob 13a. Since the pulling shaft 9 can be pulled out from the center hole 3a of the rotating shaft 3 by removing it, it is possible to easily replace the pulling shaft 9 with the screw diameter matching the screw diameter of the screw member 17.

The thrust bearing 1 on the upper surface of the load converter 6
Since the roller bearing 1 is a roller bearing, it has excellent durability even when a large load is applied. When a large load is not applied, a ball bearing may be used. Also, a tapered roller bearing can be used.

Since a thick base 10 having a predetermined thickness is arranged between the thrust bearing 11 and the lower surface of the hexagonal head 9a of the tension shaft 9, the diameter of the hexagonal head 9a of the tension shaft 9 is reduced. When the contact area between the hexagonal head 9a and the thrust bearing 11 is small, it is possible to prevent the local load from acting on the thrust bearing 11 when the maximum outer diameter is smaller than the maximum outer diameter. That is, the stress propagates at an angle of 45 degrees by interposing the thick pedestal 10, so that the load uniformly acts on the thrust bearing 11. Therefore, by interposing the thick base 10, the hexagonal head 9 a of the tension shaft 9 is formed.
Can be reduced, and the size and weight can be reduced.

The cover member 5 is composed of a body part of the tensile strength tester 1 and a handle part protruding to the side of the body part.

The load converter 6 is fixed to the cover member 5 with a first flange 6d formed at the lower end in the figure, and connects the thrust bearing 11 and the pedestal 10 with a second flange 6a formed at the upper end. It is in contact with the lower surface of the hexagonal head 9a of the tension shaft 9 through the intermediary. Thereby, it is configured to receive a reaction force of the tensile force generated in the tensile shaft 9 as a compressive force. Further, between the first flange portion 6d and the second flange portion 6a, a sensing portion 6b as a thin portion elastically deformed by receiving the compressive force is provided integrally therewith.
A strain gauge 6c as a measuring means for measuring the strain of the sensing portion 6b when receiving the compressive force, at equal intervals around the circumference,
For example, it is mounted at four places and converted into an electric signal by a bridge circuit to measure the load. In the present embodiment, the sensitivity is increased by using the sensing portion 6b as a thin portion and the strain gauge 6c is formed.
Space is secured.

The sensing portion 6b includes a first flange portion 6d,
Since the second flange portion 6a and the sensing portion 6b are fixed to the lower end portion of the cover member 5 as an integral tubular body, the first flange portion 6d and the second flange portion 6a are formed as a part of the cover member 5. It constitutes a thin portion provided between them. The strain gauge 6c is provided on the sensing portion 6b of the load converter 6 and has a tension shaft 9 based on the amount of strain (deformation) in the thrust direction.
Is measured.

FIG. 13 is a block diagram of the electrical unit for this measurement. The electrical unit 25 includes an amplifier 25a
, An A / D converter 25b, a control means 26, a display means 20, and a switch means 21.

As shown in FIG. 14, the control means 26 comprises a storage means 26a, a comparing means 26b, a counting means 26c, a reverse rotation time determining means 26d, a control signal generating means 26e, and a mode switching means 26f. And can be configured using a microcomputer. The storage unit 26a can store one or both of the set value of the tensile force and the measured value of the tensile force.

The comparing means 26b can compare the measured value measured by the measuring means 6c with the set value stored in the storage means 26a. Also, the comparison means 26b
Compares the measured value stored in the storage means 26a with the measured value subsequently measured by the measuring means 6c.

The counting means 26c is connected to the switch 21
The rotation time based on the number of rotations from turning on of the motor 20 to stopping the motor 20 can be counted. The reverse rotation time determination means 26d can determine the reverse rotation time of the motor 20 from the rotation time based on the number of rotations counted by the counting means 26c.

The control signal generating means 26 e can send a measurement start signal to the strain gauge 6 c and a rotation drive signal to the motor 20. The mode switching means 26f is provided in a break value measurement mode (step S
5 to 7), an intensity value measurement mode (modes in steps S8 to S11 described later), and a peak value measurement mode (modes in steps S12 to S17 described later).

FIG. 15 is a flowchart showing the control program. When the program is executed, in step S1, the motor 20 is started and rotates at a low speed until a predetermined time in step S2 elapses, and after the predetermined time elapses, the process proceeds to step S3. Step S3
Then, the counting means 26c is operated, and the process proceeds to step S4. In step S4, the rotation speed of the motor 20 is increased to rotate at high speed, and the process proceeds to step S5.

In step S5, the tensile force is measured based on an electric signal output from the strain gauge 6c and proportional to the tensile force of the screw member, and the flow advances to step S6. Step S6
Then, it is determined whether or not a break has occurred based on a sudden change in the electric signal output from the strain gauge 6c. If the break has occurred, the process proceeds to step S7, and if not, the process proceeds to step S8. In step S7, the measured value is displayed on the display unit 25c as a break value, and the process proceeds to step S18. In step S8, the tensile force is measured based on an electric signal output from the strain gauge 6c and proportional to the tensile force of the screw member, and the process proceeds to step S9. In step S9, the measured value of the tensile force is stored in the storage means, and the process proceeds to step S10.

In step S10, the measured value stored in step S9 is compared with the set value of the tensile force. If the set value is larger, the process proceeds to step S11, and if not, the process proceeds to step S12. In step S11,
The measured value is displayed as an intensity value on the display means 25c, and the process proceeds to step S18. In step S12, the tensile force is measured based on an electric signal output from the strain gauge 6c and proportional to the tensile force of the screw member, and the process proceeds to step S13. In step S13, the measured value measured in step S12 is stored in the storage unit, and the process proceeds to step S14. Step S
At 14, the tensile force is measured based on an electric signal output from the strain gauge 6c and proportional to the tensile force of the screw member, and the process proceeds to step S15.

In step S15, the stored value (measured value) stored in step S13 is compared with the measured value measured in step S14. If the measured value is larger, the process proceeds to step S16; To step S17
Proceed to. In step S16, the measured value of step S12 stored in the storage unit is updated to the measured value of step S14 and stored, and the process returns to step S14 to measure the tensile force again. In step S17, the stored value is displayed on the display unit 25c as a peak value, and the process proceeds to step S18.
In step S18, the motor 20 is temporarily stopped, and the process proceeds to step S19. In step S19, the counting means 26c operated in step S3 is stopped, and in step S20
Proceed to.

At step S20, the counting means 26c
Motor 2 for a time corresponding to the number of revolutions counted by
0 is reversed, and the process proceeds to step S21. Step S21
Then, the motor 20 is stopped.

Next, the operation of the above embodiment will be described. First, the tensile shaft 9 having a screw diameter suitable for the screw member 17 to be measured is attached to the tensile strength tester 1 in advance. At the time of this attachment, first, the holding lid 13 is removed from the knob 2, then the stopper plug 12 is pulled out from the opening of the knob 2, and then the tension shaft 9 is inserted into the center hole 3 a of the rotating shaft 3 from the tip side. Next, the hexagonal head 9a on the base end side is fitted into the hexagonal hole 8a of the driving plate 8 with a hexagonal hole, and then the stopper plug 12 is
a, and the tip of the stopper plug 12 is brought into contact with the hexagonal head 9 a of the tension shaft 9. Thereby, the axial movement of the tension shaft 9 can be prevented.

At the time of measurement, the seating portion of the seating attachment 7 of the tensile strength tester 1 is brought into contact with the upper surface of the steel plate 19 of the object to be measured, and then the motor 20 is rotated at a low speed to rotate the worm 14a to the worm gear 3b. Is transmitted to the pulling shaft via the rotating shaft 3 and the driving plate 8 with a hexagonal hole, whereby the tip of the pulling shaft 9 is screwed to the screw member 17. When the motor 20 is further rotated at a higher speed and the rotation angle of the tension shaft 9 gradually increases from the rotation angle when the seating attachment 7 comes into contact with the steel plate 19, the rotation angle is increased by the screw action between the distal end portion and the screw member 17. Is applied to the screw member 17 in the direction in which the screw member 17 is pulled out. At this time, a seating attachment 7 having an inner diameter larger than the maximum outer diameter of the screw member 17 is attached to the load converter 6 in advance, and the tension shaft 9 is coaxial with the seating attachment 7, so that the seating portion of the seating attachment 7 Automatically adheres to the steel plate 19 around the outside of the screw member 17,
Load transducer 6, thrust bearing 11, pedestal 10, tension shaft 9
The reaction force of the tension shaft 9 is supported through the hexagonal head 9a. Then, the reaction force of the pulling force generated in the pulling shaft 9 is transmitted to the second flange portion 6d of the load converter 6 in the reverse order of the above-described members, and is equal to the pulling force of the screw member 17 in the sensing portion 6b. A reverse compression force is applied. At this time, the thrust bearing 11 functions to reduce the rotational load of the motor 20.

The sensible portion 6b of the load converter 6 is compressed and deformed in the axial direction by the tensile force generated on the tensile shaft 9, and accordingly, an electric signal proportional to the tensile force of the screw member 17 is generated by the strain gauge 6c. Is output to the electrical unit 25 (see FIG. 13) via the receptacle connector 15, and the electrical signal is amplified by the amplifier 15b of the electrical unit 25, converted into a digital value, and displayed on the display unit 15e so as to be directly readable. The tensile force in the direction in which the screw member 17 is pulled out can be measured.

As described above, in the present embodiment, the seating portion of the seating attachment 7 is brought into contact with the upper surface of the steel plate 19 around the screw member 17 to support the tensile strength tester 1 and to fix the tip end of the tensile shaft 9. Screwed to the screw member 17, the motor 20 is rotated to apply a tensile force P to the screw member 17, and the load sensor 6 provided between the hexagonal head 9 a of the tension shaft 9 and the seating attachment 7 receives the force. The portion 6b is compressed and deformed in the axial direction, and the screw member 17 is
The maximum tensile force, tensile strength, etc. are measured.

Further, the seat attachment 7 and the tension shaft 9 can be attached to and detached from the tensile strength tester 1 so as to correspond to the shape and dimensions of the screw member 17, and the tensile strength tester 1 is reduced in size and can be freely carried. Since it is not necessary to cut out the screw member 17 from the steel plate 19, it is possible to easily measure the pull-out strength of the workpiece at the work site.

Further, in the present embodiment, since the sensing portion 6b is a thin elastic deformation portion and the amount of the deformation is measured by the strain gauge 6c, a very simple and very small test device is realized. be able to. Moreover, since the wiring from the load transducer 6 to the electrical unit 25 is provided in the cover member 5 while having a shield structure, it is possible to improve noise resistance and prevent disconnection during work, and to improve the reliability of the measurement result. In addition to greatly improving the operability, the operability of the tester can be extremely improved.

In the tensile strength tester 1 of FIG. 11, a stopper 12 is inserted into the hollow portion 3a of the rotating shaft 3 to prevent the pulling shaft 9 from coming off in the upward direction. In addition, a seating attachment 7 having an inner diameter larger than the maximum outer diameter of the member to be measured (for example, a welding nut) is screwed into the remaining end of the load converter 6 that supports the tensile peeling force via the thrust bearing 11. . For this reason, the seating attachment 7 can be easily replaced according to the nominal diameter of the nut which is the screw member 17.

In the tensile strength tester of the above embodiment, a screw is screwed into a nut or bolt connected to a metal base material such as an iron plate or a plastic base material such as ABS by welding, caulking, press-fitting, or integral molding. A screw portion 9c for applying a tensile force (axial force) to the nut or bolt according to the principle of the above is provided at the distal end portion, and a rotational drive force is received at a proximal end portion, and a reaction force of the tensile force (axial force) is transmitted to a thrust bearing. A tension shaft 9 having a hexagonal head 9a received via the rotary shaft 11 is rotatably provided at the center of rotation of the rotational force, and is fitted to a rotational force receiving portion of the tensile shaft 9 to apply a rotational force to the tensile shaft 9. Since the hollow rotating shaft 3 having an inner diameter larger than the maximum outer diameter of the hexagonal head 9a of the pulling shaft 9 is rotatably provided coaxially with the pulling shaft 9, the pulling shaft 9 is not loosened. Changes in the nominal diameter of the measured object, wear or breakage of the tension shaft 9 Detachment exchange of drawing axis by, can be performed quickly.

Further, the steel plate 19 with the screw member 17 attached thereto
In a tensile strength tester for applying a tensile force in the direction of pulling out the screw member 17 from the steel plate and measuring the tensile strength from the tensile force, a body portion 5a which is a hollow outer cylindrical portion for fixing the seating portion 7c in contact with the steel plate. A hexagonal head 9a via a hollow rotary shaft 3 rotatably held by the trunk 5a and a driving plate 8 with hexagonal holes as connecting means so that rotational power is transmitted from the rotary shaft 3. Are connected to the screw member 17 at the tip end of the shaft portion 9b having a smaller diameter than the hexagonal head 9a, and the tension shaft 9 for applying a tensile force to the screw member 17 in accordance with the rotation angle, and the tension shaft 9 A strain gauge 6c, which is a measuring means for measuring the generated tensile force; a grip 2, which protrudes from a side surface of the body 5a; a motor 20, which is a driving means disposed in the grip 2, a motor 20; Driving force transmitting means (worm 14a, worm Is provided with the car 3b) and, while ensuring the exchange of drawing axis 9 from above, since the tensile strength tester 1 by held horizontally can stand vertically,
The automatic drive by the motor 20 can be stabilized.

Since the driving force transmitting means is a worm gear device comprising the worm 14a on the motor 20 side and the worm gear 3b on the rotating shaft 3 meshing with the worm 14a, even a small motor 20 can be easily enlarged. It is possible to gain torque, and the degree of freedom of arrangement of the motor 20 increases,
The motor 20 can be housed inside the handle 2 of the tensile strength tester 1.

As shown in FIG. 16A, the drive shaft 14 of the motor 20 is offset from the center of rotation of the rotary shaft 3, so that the handle 2 is also necessarily offset. When viewed from a direction parallel to 2,
The visibility of the positioning / setting of the tension shaft 9 with respect to the screw member 17 which is the portion to be measured can be improved.

The motor 20, the worm 14a, the worm gear 3b, and the handle 2 are provided on a horizontal axis passing through the center of gravity G of the tensile strength tester 1.
With the driving of the motor 20 and the rotation by the tension shaft 9, a stable holding property can be secured. In addition, stabilization of the center of gravity position G can be achieved.

The rotating shaft 3 is supported by a plurality of bearings 4 spaced apart in the axial direction. Since the worm 14a and the worm gear 3b are arranged between the adjacent bearings 4, a thrust load is generated. Can be suppressed.

Further, as shown in FIGS. 17A and 17B, the driving force transmitting means is bevel gears 34a and 23b, so that the motor 20 and the handle 2 can be moved horizontally with a simple configuration through the position of the center of gravity. It can be located on the axis.

The on / off switch 2 of the motor 20
1 is provided in the vicinity of the body 5a of the handle 2, even if the center of gravity is shifted from the center of rotation due to the offset, a force pressing the switch 21 is applied to a position close to the center of gravity G, and the pull by the action of the force is applied. The influence on the strength tester main body can be suppressed.

As shown in FIG. 17C, the drive shaft 14 is connected to the worm 14a via the universal joint U, and the handle 2 is disposed on a horizontal line passing through the rotation center of the rotation shaft 3. Since the handle 2 is provided on a horizontal line passing through the center of rotation, the displacement of the center of gravity G can be suppressed, and the displacement of the tensile strength tester main body due to this can be prevented.

As shown in FIG. 16B, since the second handle portion 2B is provided at a position different from the handle portion 2 on the outer cylindrical portion 5a, the center of gravity G fluctuates due to the offset. In this case, the holdability can be improved in order to suppress the displacement of the tensile strength tester main body due to the fluctuation.
Further, as shown in FIG. 16A, by disposing the switch 21 so as to be substantially opposed to the handle portion 2 with the rotation axis K interposed therebetween, the main body does not displace due to the pressing force of the switch 21.

Further, since the second handle 2B has a point-symmetrical shape with respect to the handle 2 having the motor 20, the change of the center of gravity G due to the offset can be prevented.

In the tensile strength tester 1 shown in FIG. 11, a driving plate 8 having a hexagonal hole 8a provided at the center with a hexagonal head 9a of a tensioning shaft 9 is fixed to a tip of the rotating shaft 3 with a screw 16. However, in this case, a bottom may be integrally formed at the tip of the rotating shaft 3 and a driving hole (a hexagonal hole in this case) may be provided at the center of the bottom. The drive hole is not limited to a hexagon, and may have any shape as long as a rotational force can be given.

Since the motor drive can be applied to other embodiments described below, this embodiment will be described in detail.

(3) (Other Embodiment Regarding Motor Driving) Hereinafter, a specific description will be given based on an embodiment of the present invention.
38 and 19 to 21 show another embodiment of the present invention. First, the configuration will be described. 38 and 19,
Reference numeral 111 denotes a tensile strength tester which is a tensile strength tester.
The main body 111 is formed in a hollow cylindrical shape with an appropriate thickness that can be gripped by one hand by an adult,
At the lower end in the figure, a substantially hollow cylindrical seating attachment 113 of the pull-out strength measuring device 12 is provided. 114
Is an object to be measured composed of, for example, a synthetic resin plate-shaped base material 115 formed by injection molding and a screw member 116 inserted into the boss portion 115a of the base material 115. Pullout strength measuring instrument 1
12 measured. In this embodiment, the screw member 116 is an embedded nut.

The seat attachment 113 is provided on the main body 11.
1 is detachably screwed to the lower end portion, and a through hole 113a having an inner diameter D is formed in the axial direction. The inner diameter D of the through hole 113a is set to be larger than the maximum outer diameter d of the screw member 116, and when the pull-out strength measuring device 112 measures the pull-out strength of the DUT 114, the seating surface 113b of the seat attachment 113 is connected to the screw member 116. Is configured to abut the upper end surface of the boss portion 115a around the outside. That is, at the time of measurement, the seat attachment 113 has the function of the pull-out strength measuring device 112 seated on the base material 115 and as a seating portion for supporting the base material 115. In addition, since the seating attachments 113 having various sizes of inner diameters are prepared and the seating attachments 113 are detachably provided on the main body 111, the seating attachments corresponding to the maximum outer diameter d of the screw member 116 are easily provided. The attachment 113 can be replaced. In addition, the seat attachment 113
Is screwed to the main body 111, and by rotating the seat attachment 113, the height of the protrusion from the main body 111 can be arbitrarily adjusted.

[0108] Through hole 113a of seat attachment 113
A tension shaft 117 (tensile member) is seated on the attachment 1.
13, the tension shaft 117 penetrates through the seat attachment 113, the distal end 117 a is screwed into the screw member 116 of the DUT 114, and the base end 117 b is located at the upper part of the body trunk 111. It is screwed to a handle 118 provided. That is, when the pulling shaft 117 is rotated by the handle 118, the pulling force P according to the turning angle is applied while applying a reaction force to the base material 115 via the body trunk 111 and the screw member 1 is rotated.
16, the main body 111 is rotatably housed in the main body 111. Then, the seat attachment 113
In the same manner as described above, a tension shaft 117 having male threads of various sizes formed at the tip 117a is prepared, and the tension shaft 117 is removably housed in the main body 111 so that it can be easily mounted. It is possible to replace the tension shaft 117 with the screw diameter of the screw member 116. The boss 118 a of the handle 118 to be inserted into the body 111 is provided with:
After the base end 117b of the tension shaft 117 is screwed, a set screw 119 for fixing the tension shaft 117 to the boss 118a is attached. When the tension shaft 117 is replaced, the set screw 119 is loosened to remove the handle 118. From pulling shaft 117
Can be easily removed. Also, the handle 118
A groove 118b is formed all around the outer periphery of the boss portion 118a, and a screw 120 screwed on the upper portion of the main body 111 protrudes from the inner peripheral surface 111a of the main body 111 to form the groove 118a. Engage to prevent falling off. As shown in FIG. 39, the motor 20 may be directly built in and fixed to the outer cylinder member 111, and the motor shaft 151 may be directly attached to the tension shaft 117 to rotate the tension shaft 117.

Reference numeral 121 denotes a compression type load converter. The load converter 121 is screwed and fixed to the body 111 of the main body by a first flange portion 122 (first flange portion) formed at a lower end portion in the figure. , A second flange portion 123 formed on the upper end portion
(The second flange portion) abuts the boss portion 118a via the thrust bearing 125. The second flange portion 123 is configured to be attached to the tension shaft 117 via the thrust bearing 125 and the boss portion 118a so as to receive a reaction force of the tension force P generated on the tension shaft 117 as a compression force. Further, the compressive force (that is, the reaction force of the tensile force P) is applied between the first flange portion 122 and the second flange portion 123.
A sensing part 124 as a thin part which elastically deforms in response to the pressure is provided integrally therewith, and the sensing part 124 serves as a measuring means for measuring the strain of the sensing part 124 which has received the compressive force. A strain gauge 126 is mounted. Sensing part 124
The first flange 122 is formed as a part of the main body 111 by screwing and fixing the first flange 122, the second flange 123, and the sensing part 124 to the main body 111 as an integral cylindrical body. A thin portion provided between the second flange portion 123 and the second flange portion 123 is formed. Also, the strain gauge 126
Measures the tensile force P acting on the tensile shaft 117 from the amount of distortion (deformation) in the thrust direction provided on the sensing portion 124 of the body 111 of the main body. Specifically, when the sensing unit 124 is compressed and elastically changes, the strain gauge 126 outputs an electric signal proportional to the distortion rate of the sensing unit 124. The output signal of the strain gauge 126 is Intermediate terminal 112
7. The signal is input to the electrical unit 130 via the wirings 128 and 129 having the shield structure. The electrical component unit 130 has a control circuit including a microcomputer and an amplifier (not shown) in addition to a display unit 131, an operation switch group 132, a zero reset switch 133, and a battery 134, and outputs an electric signal output from the strain gauge 126. The signal is amplified, digitally converted, peak-held, and the peak value is always displayed on the display unit 131. Furthermore, the electrical component 1
Numeral 30 compares the standard value of the pull-out strength stored in the memory of the microcomputer (set in advance by the operation switch group 132) with the display value of the display unit 131, and displays a failure when the pull-out force deviates from the standard value. Turn on a lamp (not shown). It should be noted that a sound may be emitted instead of turning on the defective display lamp (pass / fail determination signal).

Next, the operation will be described. First, a tensile shaft 117 having a screw diameter suitable for the screw member 116 to be measured is attached to the pull-out strength measuring device 112 in advance. Then, at the time of measurement, the seating surface 113b of the seating attachment 113 of the pull-out strength measuring device 112 is brought into contact with the upper end of the boss 115a with the base material 115 of the measured object 114, and then the handle 118 is rotated to rotate the tip of the pulling shaft 117. The portion 117a is screwed into the screw member 116. When the boss portion 118a is further rotated and the rotation angle θ of the tension shaft 117 gradually increases from the rotation angle θ ₀ when the seat attachment 113 comes in contact with the base material 115 as shown in FIG.
The rotation angle θ is formed by the screw action between the screw member 7a and the screw member 116.
Is applied to the screw member 116 in the direction in which the screw member 116 is pulled out. At this time, the inner diameter D of the main body 111 is larger than the maximum outer diameter d of the screw member 116 in advance.
Is attached, and the tension shaft 117 is coaxial with the seating attachment 113. Therefore, the seating surface 113b of the seating attachment 113 is attached.
Automatically comes into close contact with the base material 115 around the outer periphery of the screw member 116, and the distal end portion 111 b of the body trunk 111, the load converter 12
1. The reaction force of the tension shaft 117 is supported via the conductive shaft thrust bearing 125 and the handle 118. And the tension shaft 11
7 is transmitted to the second flange portion 123 of the load converter 121 in the reverse order of the members described above,
An opposite compressive force equal to the tensile force P of the screw member 116 is applied to the sensing portion 124. At this time, the thrust bearing 125 acts to reduce the rotational load of the boss 118a.

The sensible portion 124 of the load converter 121 is compressed and deformed in the axial direction by the tensile force generated on the tensile shaft 117, and accordingly, the screw member 11 is distorted by the strain gauge 126.
6 is output to the electrical unit via the intermediate terminal 127 and the wirings 128 and 129, and the electrical signal is amplified by the amplifier of the electrical unit 130, further converted into a digital value, and converted into a digital value. Is displayed so that it can be read directly,
The tensile force P in the direction in which the screw member 116 is pulled out can be measured. In addition, by setting the standard value of the tensile force P by operating the operation switch group 132 in advance, it is possible to easily judge a defect from the lighting of the defect display lamp when the pull-out strength is insufficient.

When the boss 118a is further rotated,
Eventually, the tensile force P becomes larger than the bonding force between the base material 115 and the screw member 116, and the screw member 116 starts to come off from the base material 115. At this time, the tensile force P becomes the maximum value (extraction force) Pmax shown in FIG. 22, and can be read by the display unit 131 of the electrical component unit 130 having the peak hold function. That is, the pull-out strength of the workpiece 114 can be measured immediately at the work site. The tension shaft 11
By forming a lubricating film such as an oily or liquid Teflon on the threaded portion of the tip 117a of FIG. 7 and the threaded portion of the screw member 116 of the DUT 114, a large pulling force P can be generated with a small rotating force of the handle 118. And the life of the tension shaft 117 used repeatedly can be prolonged.

When the current measurement is completed, the main body 111
Reset switch 1 with the thumb of one hand
33, the display value of the display unit 131 is set to zero to prepare for the next measurement, or the operation switch group 132 is turned on / off.
The operation is completed by pressing the FF switch 132a.

As described above, in the present embodiment, the seating surface 113b of the seating attachment 113 is brought into contact with the upper end of the boss 115a of the base material 115 around the screw member 116 to support the pull-out strength measuring instrument 112 and to pull out. Axis 1
17 is screwed into a screw member, and a handle 118 is
Is rotated to apply a tensile force P to the screw member 116, and the load converter 12 provided between the main body 111 and the tensile shaft 117 is rotated.
1 by compressing and deforming the sensing portion 124 in the axial direction.
6 and the electrical component 130, the maximum tensile force Pmax of the screw member 116, that is, the pull-out strength is measured. When the pull-out strength is insufficient, the pass / fail judgment can be made immediately based on the lighting of the defective display lamp or the dial tone, and the operator can easily perform the pull-out strength test in a short time. In addition, the seat attachment 113 and the tension shaft 117 can be attached to and detached from the pull-out strength measuring device 112, and the shape and dimensions of the screw member 116 can be adjusted without replacing the handle 118, so that the pull-out strength measuring device 112 can be downsized. Since it is possible to carry freely, and it is not necessary to cut out the portion of the screw member 116 from the base material 115, it is possible to easily measure the pull-out strength of the workpiece 114 at the work site. The time required for this measurement was 1/1 of the conventional case using a tensile tester.
It is reduced to 10/1/50.

Further, in the present embodiment, the sensing section 124 is used as a thin elastically deformable portion and the amount of the deformation is measured by the strain gauge 12.
Since the measurement is performed at 6, a very small measuring instrument having a simple configuration can be realized. Moreover, since the wires 128 and 129 from the load converter 121 to the electrical component are provided in the main body 111 while having a shield structure, noise resistance can be improved and disconnection during work can be prevented.
The reliability of the measurement result can be greatly improved, and the operability of the measuring instrument can be extremely improved.

In the first and second embodiments, the screw member 116 is an embedded nut having a female screw. However, as shown in FIG.
51 may be insert-molded.
17 has a female screw 1 corresponding to the male screw member 151
52 are formed. Further, the thrust bearing 12 for transmitting the reaction force from the screw member 116 to the load converters 121 and 141.
Needless to say, other types of bearings that can support the thrust load can be used instead of the bearings 5 and 147.

The following two motor drive control techniques can be used as the control techniques for motor drive in the above two embodiments. Next, the drive control of this motor will be described in detail, for example, when applied to the embodiment of FIG.

(4) <Embodiment relating to drive control of motor> (5) (Embodiment in which motor is started at low speed and controlled so as to measure at constant speed)

As shown in FIGS. 13 to 15, the tensile strength tester 1 is configured such that a tensile force in a direction of pulling out the screw member 17 from the steel plate 19 is screwed onto the steel plate 19 to which the screw member 17 is attached. And a strain gauge 6c for measuring a tensile force generated on the tensile shaft 9 in a tensile strength tester for measuring a pull-out strength from the tensile force. From the predetermined time, that is, the time until the tension shaft 9 and the screw member 17 are screwed together, the tension shaft 9 rotates at a lower speed than the rotation speed at the time of measurement,
Since the control means 26 is provided so as to control the rotation speed at the time of measurement after a predetermined time elapses, that is, after screwing, the tension shaft 9 is measured for a predetermined time from the start of driving of the motor 20. By rotating the pulling shaft 9 and the screw member 17 at a lower speed than the rotating speed at the time, the screwing of the tension shaft 9 and the screw member 17 can be facilitated. Furthermore, after the predetermined time has passed and screwed, since it is controlled so as to be the rotation speed at the time of measurement,
Even if a driving means such as the motor 20 is used, the screwing can be surely and stably performed, and the measurement can be speeded up.

[0120] The tensile strength tester 1 is used to remove the screw member 17 from the steel plate 19 to which the screw member 17 is attached.
In a tensile strength tester which applies a pulling force in the direction of pulling out via a motor 20 for driving a pulling shaft 9 screwed to a screw member 17 and measures the pulling strength from the pulling force,
A hollow body 5a for fixing a seating portion 7c abutting on the body 9;
A hollow rotating shaft 3 rotatably held by the body 5a is connected to a hexagonal head 9a via a connecting means so that rotational power is transmitted from the rotating shaft 3. A tension shaft 9 that is screwed to the screw member 17 at the tip end of the small-diameter shaft portion 9b and applies a tensile force to the screw member 17 in accordance with the rotation angle, and a strain gauge that measures the tensile force generated on the tension shaft 9 6c and the motor 20
A predetermined time from the start of the driving of the
And a control means 26 for controlling the tension shaft 9 to rotate at a lower speed than the rotation speed at the time of measurement until a predetermined time elapses, that is, after the screwing, so that the rotation speed at the time of measurement is reached. The rotation axis 3 and the tension axis 9
In the connecting portion with the connecting member, the turning power of the rotating shaft 3 can be transmitted to the pulling shaft 9 while absorbing the reaction force, so that the loosening of the connecting portion can be prevented. Further, by rotating the tension shaft 9 at a lower speed than the rotational speed at the time of measurement for a predetermined time from the start of driving of the motor 20, the tension shaft 9 and the screw member 1 are rotated.
7 is easily screwed, and after a predetermined time elapses,
Since the rotation speed is controlled so as to be the rotation speed at the time of measurement, the screwing can be surely and stably performed by using a driving means such as the motor 20, and the measurement can be speeded up.

The tensile strength tester has a storage means 26a for storing a set value of the tensile force, and a comparison means for comparing the measured value measured by the strain gauge 6c with the set value stored in the storage means 26a. 26b and a control signal generating means 26e for generating a control signal for stopping the motor 20 based on the comparison result of the comparing means 26b.
Therefore, the strength value can be measured based on the set value that guarantees safety, and it is possible to correspond to an object to be measured that is evaluated with the strength at a certain set value. Further, since there is no need to break the workpiece, there is no possibility that the screw member 17 bites into the tension shaft 9.

Further, before reaching the set tensile force value stored by the storage means 26a, the tensile strength tester 1
When the peak value / rupture value of the tensile force is measured, the control means 26 for controlling the motor 20 to stop is provided. By stopping the motor 20, unnecessary driving of the motor 20 can be prevented.

Further, since the tensile strength tester 1 is provided with the display means 25c for displaying the measured peak value / break value, the peak value / break value can be displayed. This is a small tensile strength tester that can be easily carried to carry out pull-out force measurement and pull-out strength inspection.

The tensile strength tester 1 has a storage means 26 for storing a measured value measured by the strain gauge 6c.
a, a comparing unit 26b for comparing the measured value stored in the storing unit 26a with a measured value thereafter measured by the strain gauge 6c, and stopping the motor 20 based on the comparison result of the comparing unit 26b. Since the control unit 26 includes the control signal generation unit 26e that generates the control signal, the motor 20 can be stopped based on the comparison result of the comparison unit 26b.

Further, the strength of the measured object can be known only by knowing the intensity peak value, and the tensile strength tester 1 can store the set value of the tensile force. 26a, storage means 26a for storing the tensile force measurement value measured by the strain gauge 6c, and comparing means 26 for comparing the stored tensile force measurement value with the set tensile force value.
b, when the measured value of the tensile force is larger than the set value of the tensile force, the set value of the tensile force is updated to the measured value of the tensile force, stored as the updated set value of the tensile force, and the tensile force is measured again. If the updated set value of the tensile force is larger, the updated set value of the tensile force is displayed as a peak value on the display unit 2.
5c, a control signal generating means 26e for generating a control signal is provided, so that the peak value can be found if the measured value is lower than the stored value, and the stored value is used as the peak value. , And the peak value can be measured, whereby the intensity of the measured object can be measured.

Further, the tensile strength tester 1 controls the control signal from the control signal generating means 26e so that the control means 26 reversely rotates the motor 20 after displaying the peak value and stops the motor 20 after the reverse rotation. Therefore, it is easy to remove the screw member 17 from the tension shaft 9.

The tensile strength tester 1 has a storage means 26a for storing the set value of the tensile force and a storage means 26a for storing the measured value of the tensile force measured by the strain gauge 6c.
Means 2 for comparing the measured value with the set value
6b, a control means 26 for controlling the control signal generation means 26e to generate a control signal so as to stop the motor 20 based on the comparison result of the comparison means 26b, and a tensile force setting stored by the storage means 26a. If the peak value / break value of the tensile force is measured before reaching the value, the measured peak value / break value is displayed on the display means 25c as the peak value / break value, and the motor 20 is stopped. If the measured force value is larger than the set tensile force value, the set tensile force value is updated to the measured tensile force value and stored in the storage means 26a as the updated set tensile force value, and the tensile force is measured again. If the updated tension setting value is larger, the updated tension setting value is set as a peak value in the display means 2.
5c to control the driving means so as to stop the driving means. Therefore, before reaching the set tensile force value stored by the storage means 26a, the peak value of the tensile force /
When the break value is measured, the measured peak value / break value is displayed on the display means 25c as the peak value / break value and the motor 20 is stopped, so that the peak value / break value is reached before reaching the tensile force set value. Even when the break value is measured, the peak value / break value can be measured. If the measured tensile force value is larger than the set tensile force value, the set tensile force value is updated to the measured tensile force value and updated. The stored tensile force set value is stored in the storage means 26a, and the tensile force is measured again.
When the updated set value of the pulling force is larger, the updated set value of the pulling force is displayed as a peak value on the display means 25c and the motor 20 is stopped, so that the peak value can be known.

The tensile strength tester 1 controls the control means 26 to generate a control signal from the control signal generation means 26e so as to rotate the motor 20 in the reverse direction before stopping the motor 20. It is easy to remove the screw member 17 from.

Further, the tensile strength tester 1 comprises a motor 2
0, a switch 21 for turning on / off 0, a counting means 26c for counting a rotation time from when the switch 21 is turned on to a stop of the motor 20, and a reverse rotation time of the motor 20 based on the rotation time counted by the counting means 26c. And a reverse rotation time determining means 26d for determining, after the set value / peak value is measured, the control means 26 reversely rotates the motor 20 based on the reverse rotation time determined by the reverse rotation time determining means 26d, Since the control signal is generated from the control signal generating means 26e so as to stop the motor 20 after the elapse of the reverse rotation time, the motor 20 is controlled based on the forward rotation time of the motor 20 before the motor 20 is stopped.
Can be rotated in the reverse direction, and the screw member 17 can be
It is very easy to remove.

In the tensile strength tester shown in FIGS.
As with the tensile strength tester 1 of FIGS.
0, a motor 20, a drive shaft 14, a worm 14a,
The worm gear 3b, the electrical unit 25, etc. are housed, and FIGS.
By using the same control device as in the fifth embodiment, the above-described effects can be obtained.

In the above, the measurement start may be commanded when the motor torque is detected and the torque becomes stable, or the time until the constant speed is reached as shown in FIGS. The measurement may be started in accordance with the operation of the counter after the predetermined time elapses.

With this configuration, it is possible to evaluate the tensile force with high accuracy by measuring the tensile force after the rotation is stabilized.

Further, in FIG. 14, the motor is rotated at a constant speed (first speed) at a constant speed. However, the rotation is made slower than the constant speed at the time of measurement so that the tension shaft is easily screwed into the screw member. The constant speed of the predetermined constant speed (second
The speed may be gradually increased until the speed reaches (speed).

(6) (Explanation of Mode) The mode is (A) a set mode in which a set value is determined and measured, and the set value is used to measure whether or not a screw member (nut, bolt, etc.) is removed from the base material. It comprises three modes: (B) a peak value measurement mode for measuring a peak value, and (C) a break value measurement mode for measuring a break value.

(7) (Description of (A) Setting Mode) As shown in FIG. 15, in step S10, the measured value stored in step S9 is compared with the measured tensile force. Proceeds to step S12. In step S11, the measured value is displayed on the display unit 25c as an intensity value, and the process proceeds to step S18. In step S12,
The tensile force is measured based on an electric signal output from the strain gauge 6c and proportional to the tensile force of the screw member, and step S1 is performed.
Proceed to 3. In step S13, the measured value measured in step S12 is stored in the storage unit, and the process proceeds to step S14. In step S14, the tensile force is measured based on an electric signal output from the strain gauge 6c and proportional to the tensile force of the screw member, and the process proceeds to step S15.

In step S15, the stored value (measured value) stored in step S13 is compared with the measured value measured in step S14. If the measured value is not larger, the process proceeds to step S17. In step S17, the stored value is displayed on the display unit 25c as a peak value, and the process proceeds to step S1.
Proceed to 8. In step S18, the motor 20 is temporarily stopped (stopped). By performing such control, it is possible to determine and measure the set value, and to measure whether the screw member (nut, bolt, etc.) is not removed from the base material even with the set value.

Further, after the motor is temporarily stopped in step S18, in step S19, the counting means 26c operated in step S3 is stopped, and the process proceeds to step S20.

In the step S20, the counting means 26c
Motor 2 for a time corresponding to the number of revolutions counted by
0 is reversed, and the process proceeds to step S21. Step S21
Then, the motor 20 is stopped. By controlling in this way and rotating the motor 20 in the reverse direction, the tension shaft can be automatically released from the nut.

The tensile strength tester 1 shown in FIG.
In a tensile strength tester for applying a tensile force in the direction of pulling out the screw member 17 from the steel plate 19 to the steel plate 19 to which the steel plate 7 is attached, and measuring the pull-out strength from the tensile force, a hollow body for fixing the seating portion 7c contacting the steel plate 17 A hexagonal head 9a via a hexagonal hole driving plate 8 so that a rotating power is transmitted from the rotating shaft 3 and a hollow rotating shaft 3 rotatably held by the body 5a. Shaft 9b that is connected and has a smaller diameter than hexagonal head 9a
A tension shaft 9 that is screwed to the screw member 17 at the tip of the shaft to apply a tensile force corresponding to the rotation angle to the screw member 17, a strain gauge 6c for measuring the tensile force generated in the tension shaft 9, and a rotation shaft. 3, a storage unit 26a for storing a set value of the tensile force, a comparison unit 26b for comparing the measured value measured by the strain gauge 6c with the set value, and a comparison unit 26b.
And control means 26 for controlling the motor 20 to stop when the set value is greater than the measured value. With this configuration, if the tensile limit is exceeded, there is a risk that the tester will be broken. Therefore, measurement can be performed within the measurement limit of the tester, and damage to the tester can be prevented.

In the tensile strength tester 1, the driving means comprises a motor 20, and the control means 26 controls the motor 20 to rotate in the reverse direction before stopping. With such a configuration, it is easy to remove the screw member 17 from the tension shaft 9.

The tensile strength tester 1 is counted by a switch 17 for turning on / off the motor 20, a counting means 26c for counting the rotation time from the turning on of the switch 17 to the stop of the motor 20, and a counting means 26c. Reverse rotation time determining means 26d for determining the reverse rotation time of the motor 20 based on the measured rotation time, and the control means 26 determines the reverse rotation time after the set value / peak value is measured. The motor 20 reversely rotates based on the reverse rotation time, and after the reverse rotation time elapses, the motor 20
Is controlled to stop. With such a configuration, it is extremely easy to remove the screw member 17 from the tension shaft 9.

(Case where the break value is reached before reaching the set value and the motor drive is stopped in an emergency) As shown in FIG. 15, in step S6, a sudden change in the electric signal output from the strain gauge 6c is performed. It is determined whether or not the rupture has occurred based on the above. If the rupture has occurred, the process proceeds to step S7. In step S7, the display unit 25c uses the measured value as a break value.
And the process proceeds to step S18. In step S18, the motor 20 is temporarily stopped (emergency stop), and
Proceed to 19. In step S19, the counting means 26c operated in step S3 is stopped, and the process proceeds to step S20.

In the step S20, the counting means 26c
Motor 2 for a time corresponding to the number of revolutions counted by
0 is reversed, and the process proceeds to step S21. Step S21
Then, the motor 20 is stopped.

Also, the tensile strength tester 1 shown in FIGS.
Before the measured value measured by the strain gauge 6c reaches the tensile force set value stored by the storage means 26a,
When the peak value / rupture value of the tensile force is measured, the control means 26 for controlling the motor 20 to stop is provided. By stopping the motor 20, unnecessary driving of the motor 20 can be prevented.

Further, since the tensile strength tester 1 has display means for displaying the measured peak value / rupture value,
The peak value / rupture value can be displayed, and it can be carried to a molding work site or the like, and the removal force can be easily measured, and the pass / fail inspection of the drawing strength can be performed.

(When the peak value is reached before the measured value, the motor drive is reduced to a low speed (third speed))

FIG. 26 is a flowchart showing the control program in FIGS. When the program is executed, in step S1, the motor 20
Is started and the motor rotates at a low speed until a predetermined time in step S2 elapses, and after the predetermined time elapses, the process proceeds to step S3. In step S3, the counting means 26c is operated, and the process proceeds to step S4. In step S4, the motor 2
0 rotation speed and high speed rotation, step S
Go to 5.

In step S5, the tensile force is measured based on an electric signal output from the strain gauge 6c and proportional to the tensile force of the screw member, and the flow advances to step S6. Step S6
Then, it is determined whether or not a break has occurred based on a sudden change in the electric signal output from the strain gauge 6c. If the break has occurred, the process proceeds to step S7, and if not, the process proceeds to step S8. In step S7, the measured value is displayed on the display unit 25c as a break value, and the process proceeds to step S18. In step S8, the tensile force is measured based on an electric signal output from the strain gauge 6c and proportional to the tensile force of the screw member, and the process proceeds to step S9. In step S9, the measured value of the tensile force is stored in the storage means, and the process proceeds to step S10.

In step S10, the measured value stored in step S9 is compared with the measured tensile force. If the measured value is larger, the process proceeds to step S11, and if not, the process proceeds to step S12. In step S11,
The measured value is displayed as an intensity value on the display means 25c, and the process proceeds to step S18. In step S12, the tensile force is measured based on an electric signal output from the strain gauge 6c and proportional to the tensile force of the screw member, and the process proceeds to step S13. In step S13, the measured value measured in step S12 is stored in the storage unit, and the process proceeds to step S14. Step S
At 14, the tensile force is measured based on an electric signal output from the strain gauge 6c and proportional to the tensile force of the screw member, and the process proceeds to step S15.

In step S15, the stored value (measured value) stored in step S13 is compared with the measured value measured in step S14. If the measured value is larger, the process proceeds to step S16. To step S17
Proceed to. In step S16, the measured value of step S12 stored in the storage unit is updated to the measured value of step S14 and stored, and the process returns to step S14 to measure the tensile force again.

In step S17, the stored value is displayed on the display means 25c as a peak value, and the flow advances to step S18.
In step S18, the drive torque of the motor 20 is reduced. In this way, by reducing the driving torque of the motor 20 in step S18, when the steel plate 19 and the screw member 17 break sharply, the load on the motor can be reduced.

In step S19, the motor 20 is temporarily stopped, and the flow advances to step S20. In step S20, the counting unit 26c operated in step S3 is stopped, and the process proceeds to step S21.

In the step S21, the counting means 26c
Motor 2 for a time corresponding to the number of revolutions counted by
0 is reversed, and the process proceeds to step S22. Step S22
Then, the motor 20 is stopped.

Note that the third speed may be the same as the second speed. However, in this case, a constant speed is preferable because the measurement is being performed.

(Regarding Display) The sensing portion 6b of the load transducer 6 is compressed and deformed in the axial direction by the tensile force generated on the tensile shaft 9 in FIG. 1, and accordingly, the tensile force of the screw member 17 is changed by the strain gauge 6c. Is output to the electrical unit 25 (see FIG. 13) via the receptacle connector 15,
The electric signal is amplified by the amplifier 25a of the electrical unit 25,
Further, it is converted into a digital value and displayed so as to be directly readable by the display means 25c, and the tensile force in the direction in which the screw member 17 is pulled out can be measured.

Since the tensile strength tester 1 has display means for displaying the measured peak value / rupture value,
The peak value / rupture value can be displayed, and it can be carried to a molding work site or the like, and the removal force can be easily measured, and the pass / fail inspection of the drawing strength can be performed.

The tensile strength tester 1 is connected to a steel plate 19 to which the screw member 17 is attached via a motor 20 for driving a tension shaft 9 for screwing the tensile force in the direction of pulling out the screw member 17 from the steel plate 19 to the screw member 17. In addition, in a tensile strength tester for measuring pull-out strength from the tensile force, a strain gauge 6c for measuring a tensile force generated on the tensile shaft 9, storage means 26a for storing a set value of the tensile force, and a strain gauge 6c Storage means 26a for storing the measured value measured by the measuring means, comparison means 26b for comparing the measured value measured by the strain gauge 6c with the set value stored in the storage means 26a, and stored in the storage means 26a. Measured value followed by strain gauge 6
comparing means 26 for comparing with the measured value measured by c.
b, the set mode for stopping the motor 20 is compared with the measured value stored in the storage means 26a and the subsequently measured value based on the comparison result of comparing the measured value and the set value. The mode switching means 26f for switching between the peak value measurement mode in which the motor 20 is stopped and the peak value measurement mode is provided based on the comparison result, so that the intensity of the measured object can be known only by knowing the intensity peak value. Since the peak value can be determined when the measured value is lower than the stored value, the peak value can be measured by using the stored value as the peak value, whereby the intensity of the measured object can be measured.

Further, the tensile strength tester 1 updates the peak value measurement mode by updating the set tensile force value to the measured tensile force value when the measured tensile force value is larger than the set tensile force value. In addition to storing the tensile force set value, the tensile force is measured again, and if the updated tensile force set value is larger than the measured tensile force value, the updated tensile force set value is displayed as a peak value. Since it is controlled, the peak value can be displayed.

In the peak value measurement mode, when the measured tensile force is larger than the set tensile force, the set tensile force is updated to the measured tensile force and stored as the updated set tensile force. Measure the tensile force again, and if the updated tensile force set value is greater than the measured tensile force value, control is performed so that the updated tensile force set value is displayed as the peak value, so the peak value is displayed can do.

(8) ((B) Peak Value Measurement Mode) As shown in FIG. 14, the control signal generation means 26e sends a measurement start signal to the strain gauge 6c and
A rotation drive signal can be sent to zero. The mode switching means 26f includes a break value measurement mode (steps S5 to S7 described later), an intensity value measurement mode (steps S8 to S11 described later), and a peak value measurement mode (steps S12 to S17 described later). Mode).

As shown in FIG. 15, in step S15, the stored value (measured value) stored in step S13 is compared with the measured value measured in step S14, and if the measured value is larger, step S15 is performed. The process proceeds to S16, and if not, the process proceeds to Step S17. In step S16,
The measured value of step S12 stored in the storage means is updated to the measured value of step S14, and stored.
Returning to 4, the tensile force is measured again. In step S17, the stored value is displayed on the display unit 25c as a peak value,
Proceed to step S18. In step S18, the motor 2
0 is temporarily stopped, and the process proceeds to step S19. Step S1
In step 9, the counting means 26c operated in step S3 is stopped, and the process proceeds to step S20.

The tensile strength tester 1 shown in FIGS. 11 and 12 drives the tension shaft 9 for screwing the screw member 17 into the steel plate 19 to which the screw member 17 is attached, in the direction of pulling out the screw member 17 from the steel plate 19. A strain gauge 6c for measuring a tensile force generated on the tensile shaft 9 and a measured value measured by the strain gauge 6c in a tensile strength tester for measuring a pull-out strength from a tensile force applied through a motor 20 to be applied. A storage unit 26a, a comparison unit 26b for comparing the measurement value stored in the storage unit 26a with a measurement value subsequently measured by the strain gauge 6c, and a pre-data based on the result compared by the comparison unit 26b. The control means 26 for controlling the peak value at which the sample 20 is stopped is provided, so that conventionally, only the break value was supported. Seen alone can know the strength of itself, also, the measurement value from the storage value is lower understand peak value, it can be the stored value and the peak value.

The tensile strength tester 1 has a storage means 26a for storing the set value of the tensile force and a comparing means 26b for comparing the stored measured measured tensile force with the set tensile force.
If the measured value of the tensile force is larger than the set value of the tensile force, the set value of the tensile force is updated to the measured value of the tensile force and stored as the updated set value of the tensile force. When the set tensile force set value is larger, the control means 26 controls the display so that the updated set tensile force value is displayed as a peak value. Alone, the strength of the object can be known.If the measured value is lower than the memorized value, the peak value can be known, and the peak value can be measured by using the memorized value as the peak value. Can be measured.

In the tensile strength tester 1, the driving means is constituted by a motor, and the control means 26 controls the motor to rotate in the reverse direction after the display, and to stop the motor after the reverse rotation. It is easy to remove the screw member 17 from the shaft 9.

The tensile strength tester 1 is counted by a switch 21 for turning on / off the motor 20, a counting means 26c for counting the rotation time from the turning on of the switch 21 to the stop of the motor 20, and a counting means 26c. Reverse rotation time determining means 26d for determining the reverse rotation time of the motor 20 based on the measured rotation time, and the control means 26 determines the reverse rotation time after the set value / peak value is measured. The motor 20 reversely rotates based on the reverse rotation time, and after the reverse rotation time elapses, the motor 20
Is stopped so that the motor 20 is rotated in the reverse direction based on the forward rotation time, so that it is extremely easy to remove the screw member 17 from the tension shaft 9.

(Regarding Stop of Driving) As shown in FIG. 14, the counting means 26c can count the rotation time based on the number of rotations from when the switch 21 is turned on to when the motor 20 is stopped. Reverse rotation time determination means 26d
Can determine the reverse rotation time of the motor 20 from the rotation time based on the number of rotations counted by the counting means 26c.

As shown in FIG. 15, in step S15, the stored value (measured value) stored in step S13 is compared with the measured value measured in step S14, and if the measured value is larger, step S15 is performed. The process proceeds to S16, and if not, the process proceeds to Step S17. In step S16,
The measured value of step S12 stored in the storage means is updated to the measured value of step S14, and stored.
Returning to 4, the tensile force is measured again. In step S17, the stored value is displayed on the display unit 25c as a peak value,
Proceed to step S18. In step S18, the motor 2
0 is temporarily stopped, and the process proceeds to step S19. Step S1
In step 9, the counting means 26c operated in step S3 is stopped, and the process proceeds to step S20.

In the step S20, the counting means 26c
Motor 2 for a time corresponding to the number of revolutions counted by
0 is reversed, and the process proceeds to step S21. Step S21
Then, the motor 20 is stopped.

The tensile strength tester 1 shown in FIGS. 11 and 12 drives the tensile shaft 9 for screwing the screw member 17 to the steel plate 19 to which the screw member 17 is attached, by applying a pulling force in the direction of pulling out the screw member 17 from the steel plate 19. A tensile strength tester for measuring the pull-out strength from the tensile force,
A strain gauge 6c for measuring a tensile force generated on the tensile shaft 9,
A storage unit 26a for storing a set value of the tensile force, a comparison unit 26b for comparing a measured value measured by the strain gauge 6c with a set value stored in the storage unit 26a, and a comparison unit 26b based on a comparison result. And the control means 26 for controlling the motor 20 to stop. Conventionally, only a manual breaking value was measured. can do.

Further, the tensile strength tester 1 has a strain gauge 6c.
Control means 26 for controlling motor 20 to stop when the peak value / rupture value of the tensile force is measured before the measured value measured by the storage means 26a reaches the tensile force set value stored by storage means 26a. Since data is provided that breaks early and breaks due to poor strength, etc.
Unnecessary driving of the motor 20 can be prevented by stopping the motor 20.

Further, since the tensile strength tester 1 is provided with display means for displaying the measured peak value / rupture value,
The peak value / rupture value can be displayed, and the measurement can be carried out easily at a molding work site or the like, and the removal force can be easily measured and the pass / fail inspection of the drawing strength can be performed.

The tensile strength tester 1 is connected to a steel plate 19 on which the screw member 17 is attached via a motor 20 for driving a tension shaft 9 for screwing the tensile force in the direction of pulling out the screw member 17 from the steel plate 19 to the screw member 17. In addition, in a tensile strength tester for measuring pull-out strength from the tensile force, a strain gauge 6c for measuring a tensile force generated on the tensile shaft 9, storage means 26a for storing a set value of the tensile force, and a strain gauge 6c Storage means 26a for storing the measured value measured by the measuring means, comparison means 26b for comparing the measured value measured by the strain gauge 6c with the set value stored in the storage means 26a, and stored in the storage means 26a. Measured value followed by strain gauge 6
comparing means 26 for comparing with the measured value measured by c.
b, the set mode for stopping the motor 20 is compared with the measured value stored in the storage means 26a and the subsequently measured value based on the comparison result of comparing the measured value and the set value. The mode switching means 26f for switching between the peak value measurement mode in which the motor 20 is stopped and the peak value measurement mode is provided based on the comparison result, so that the intensity of the measured object can be known only by knowing the intensity peak value. Since the peak value can be determined when the measured value is lower than the stored value, the peak value can be measured by using the stored value as the peak value, whereby the intensity of the measured object can be measured.

The tensile strength tester 1 updates the peak value measurement mode by updating the set tensile force value to the measured tensile force value when the measured tensile force value is larger than the set tensile force value. In addition to storing the tensile force set value, the tensile force is measured again, and if the updated tensile force set value is larger than the measured tensile force value, the updated tensile force set value is displayed as a peak value. Since it is controlled, the peak value can be displayed.

In the tensile strength tester 1, the driving means is constituted by the motor 20, the motor 20 is rotated in the reverse direction after the display, and the motor 20 is stopped after the reverse rotation. Easy to remove.

The tensile strength tester 1 has a switch 21 for turning on / off the motor 20, a counting means 26c for counting the rotation time from the turning on of the switch 21 to the stop of the motor 20, and a counting means 26c. Reverse rotation time determination means 26d for determining the reverse rotation time of the front motor 20 based on the rotation time thus obtained. After the set value / peak value is measured, the control means 26 controls the reverse rotation time determination means 26d. The motor 20 is rotated in reverse based on the determined reverse rotation time, and the motor 20 is controlled to stop after the reverse rotation time has elapsed.
Before the motor is stopped, the motor 20 is controlled to perform reverse rotation and reverse rotation based on the reverse rotation time, so that it is extremely easy to remove the screw member from the tension member.

FIG. 13 is a block diagram of the electrical unit for this measurement. The electrical unit 25 includes an amplifier 25a, an A / D converter 25b, a control unit 26, a display unit 20, and a switch unit 21.

As shown in FIG. 14, the control means 26 comprises a storage means 26a, a comparing means 26b, a counting means 26c, a reverse rotation time determining means 26d, a control signal generating means 26e, and a mode switching means 26f. And can be configured using a microcomputer. The storage unit 26a can store one or both of the set value of the tensile force and the measured value of the tensile force.

The comparing means 26b can compare the measured value measured by the measuring means 6c with the set value stored in the storage means 26a. Also, the comparison means 26b
Compares the measured value stored in the storage means 26a with the measured value subsequently measured by the measuring means 6c.

The counting means 26c includes a switch 21
The rotation time based on the number of rotations from turning on of the motor 20 to stopping the motor 20 can be counted. The reverse rotation time determination means 26d can determine the reverse rotation time of the motor 20 from the rotation time based on the number of rotations counted by the counting means 26c.

As shown in FIG. 15, in step S20, the motor 20 is rotated reversely for a time corresponding to the number of revolutions counted by the counting means 26c.
Proceed to. In step S21, the motor 20 is stopped.

The tensile strength tester 1 shown in FIGS.
The driving means is constituted by the motor 20 and the control means 26
Since the motor 20 is controlled to rotate in the reverse direction before the motor 20 is stopped, it is easy to remove the screw member 17 from the tension shaft 9.

The tensile strength tester 1 is counted by a switch 17 for turning on / off the motor 20, a counting means 26c for counting the rotation time from the turning on of the switch 17 to the stop of the motor 20, and a counting means 26c. Reverse rotation time determining means 26d for determining the reverse rotation time of the motor 20 based on the measured rotation time, and the control means 26 determines the reverse rotation time after the set value / peak value is measured. The motor 20 reversely rotates based on the reverse rotation time, and after the reverse rotation time elapses, the motor 20
Is stopped so that it is extremely easy to remove the screw member 17 from the tension shaft 9.

(9) ((C) Rupture value measurement mode) This Rupture value measurement mode is basically the same as the measurement contents of the tensile strength tester shown in FIGS. 1 to 10 or FIGS. .

FIG. 27 is a front sectional view showing a tensile strength tester according to a twelfth embodiment of the present invention, and FIG. 12 is a side view showing the same. It was configured to be provided by driving means.

As shown in FIGS. 27 and 12, the tensile strength tester 1A according to the twelfth embodiment comprises a handle portion 2 which is a grip portion protruding to the side of the body 5a of the cover member 5, and
The motor 20 which is a driving means housed in the handle portion 2
And a drive shaft provided on the motor 20 and having a worm at the tip, a rotating shaft 3 having a worm gear on the outer periphery, and rotating the rotating shaft 3 via a single-row deep groove ball bearing 4 which is a radial bearing. A cover member 5 that can be freely held, a compression-type load transducer 6 fixed coaxially with the body 5a below the body 5a (outer cylindrical member) of the cover member 5, and a lower end of the load transducer 6 A seating attachment 7 which is detachably screwed coaxially with the load converter, a hexagonal hole driving plate 8 fixed to the lower end of the rotating shaft 3 via small screws 16, and a hexagonal hole of the hexagonal hole driving plate 8 Hole 8
a tension shaft 9 which is a tension member in which a hexagonal head 9a is fitted
And a thrust needle roller bearing 11, which is a thrust bearing for rotatably holding the tension shaft 9 on the load converter 6 via a pedestal 10, and a tension shaft 9 inserted through the center hole 3a of the rotation shaft 3.
A stopper 12 abutting against the hexagonal head 9a, a retainer lid abutting the stopper 12, a receptacle connector 15 for supplying power to the motor 20 and extracting an electric signal from the load converter 6, and a receptacle connector 15. And an electrical unit 25 (see FIG. 13) connected to the electrodes.

The seat attachment 7 is screwed to the lower end of the load converter 6 which is a compressive force sensing portion. And
The thread portion 7d of the seat attachment 7 is formed in a reverse thread to the thread portion 9c of the tension shaft 9. Further, the seat attachment 7 is formed with an uneven portion 7h, which is a locking means with which the broken nut 17 comes into contact. Further, the portion including the seating portion 7c, which is the tip of the seating attachment 7, is magnetized to be a magnet.

The tension shaft 9 is formed to have such a length that its tip is located above the lower end of the seating attachment 7. That is, the tip of the tension shaft 9 is attached to the seat attachment 7.
At the lower end of the seating portion 7c at the lower end. Further, at least the tip of the tension shaft 9 is magnetized.

An on / off switch 21 of a driving means 20 is mounted near the body 5a of the cover member 5. Since the on / off switch 21 is disposed near the body 5a in this manner, the force pressing the switch 21 acts near the center of gravity G, and therefore, the tensile strength tester 1A is prevented from moving by the force pressing the switch 21. can do.

The bearings 4 are provided at a predetermined distance from each other in the direction of the rotating shaft, and a worm gear 3b of driving force transmitting means is arranged between these bearings 4 so as to suppress the generation of a thrust load. I have. In addition, tensile strength tester 1A
Is configured to be located between the bearings 4.

Since the worm gear 3b is arranged between the bearings 4 as described above, it is possible to prevent the shake caused by the rotation of the rotating shaft 3 and to suppress the generation of the thrust load. Further, it is desirable to arrange the center of gravity G of the tensile strength tester 1A between the bearings 4.

The object to be measured by the tensile strength tester 1A is, for example, a welding nut which is a screw member 17 welded 18 to a steel plate 19 in this embodiment. The tensile strength of the DUT 17 is measured by the tensile strength tester 1A.

The seat attachment 7 is formed with a hole 7a which penetrates in the axial direction and into which the tension shaft 9 is loosely inserted.
The inner diameter D of the hole 7a is set to be larger than the maximum outer diameter d of the screw member 17, and when the tensile strength tester 1A measures the tensile strength of the object to be measured, the seating portion 7 of the seating attachment 7
c is configured to abut on the upper surface of the steel plate 19 at the outer periphery of the screw member 17. That is, the seating attachment 7 has a function as a seating portion that supports the steel plate 19 by measuring the tensile strength tester 1A on the upper surface of the steel plate 19 during measurement. In addition, seating attachments 7 having inner diameters of various sizes are prepared.
Are detachably provided on the load converter 6, so that the seating attachment 7 corresponding to the maximum outer diameter of the screw member 17 can be easily replaced. Further, since the seat attachment 7 is screwed to the load converter 6, by rotating the seat attachment 7, the protruding height from the load converter 6 can be arbitrarily adjusted.

A hole 7a of the seat attachment 7 has a shaft portion 9b having a screw portion 9c at the tip and a hexagonal head 9a having a larger diameter than the shaft portion 9b provided at the base end of the shaft portion 9b. 9 is coaxially inserted with the seat attachment 7. The shaft portion 9b of the tension shaft 9 penetrates through the seating attachment 7, and the screw portion 9c at the distal end is screwed to the screw member 17 of the object to be measured, and the hexagonal head 9a at the base end portion of the driving plate 8 with a hexagonal hole. It is fitted in the hexagonal hole 8a. Then, the rotating power transmitted to the driving plate 8 with hexagonal holes is transmitted to the tension shaft 9.

The center hole 3a of the rotating shaft 3 to which the driving plate 8 with hexagonal holes is fixed has a diameter larger than the maximum outer diameter of the hexagonal head 9a of the tension shaft 9, and the center shaft 3a extends from the center hole 3a. 9a
Are configured to be freely insertable and removable.

When the drive shaft 14, the worm 14a, and the worm gear 3b are rotated by the drive of the motor 20, the rotating shaft 3 transmits the rotating power. Then, the rotating power of the rotating shaft 3 is transmitted to the driving plate 8 with a hexagonal hole, and the rotating power of the driving plate 8 with a hexagonal hole is transmitted to the tension shaft 9. Thus, the tension shaft 9 applies a reaction force to the steel plate 19 via the hexagonal head 9 a of the tension shaft 9, the pedestal 10, the roller bearing 11, the load converter 6, and the seating attachment 7, and the tension according to the rotation angle. A force is applied to the welding nut 17.

As described above, since the worm gear device is used as the driving force transmitting means, a load of several ton class can be applied to the member to be measured, and the size of the motor 20 can be reduced.

Like the seating attachment 7, the pulling shaft 9 is prepared by forming a male screw having a screw thread of various sizes in the threaded portion 9c at the distal end. The stopper plug 12 is connected to the knob 13a. Since the pulling shaft 9 can be pulled out from the center hole 3a of the rotating shaft 3 by removing it, it is possible to easily replace the pulling shaft 9 with the screw diameter matching the screw diameter of the screw member 17.

The thrust bearing 1 on the upper surface of the load converter 6
Since the roller bearing 1 is a roller bearing, it has excellent durability even when a large load is applied. When a large load is not applied, a ball bearing may be used. Also, a tapered roller bearing can be used.

By disposing a thick base 10 having a predetermined thickness between the thrust bearing 11 and the lower surface of the hexagonal head 9a of the tension shaft 9, the diameter of the hexagonal head 9a of the tension shaft 9 is reduced. When the contact area between the hexagonal head 9a and the thrust bearing 11 is small, it is possible to prevent the local load from acting on the thrust bearing 11 when the maximum outer diameter is smaller than the maximum outer diameter. That is, the stress propagates at an angle of 45 degrees by interposing the thick pedestal 10, so that the load uniformly acts on the thrust bearing 11. Therefore, by interposing the thick base 10, the hexagonal head 9 a of the tension shaft 9 is formed.
Can be reduced, and the size and weight can be reduced.

The cover member 5 is provided with a tensile strength tester 1A.
Of the main body and a handle protruding to the side of the main body.

The load converter 6 is fixed to the cover member 5 with a first flange 6d formed at the lower end in the figure, and connects the thrust bearing 11 and the pedestal 10 with a second flange 6a formed at the upper end. It is in contact with the lower surface of the hexagonal head 9a of the tension shaft 9 through the intermediary. Thereby, it is configured to receive a reaction force of the tensile force generated in the tensile shaft 9 as a compressive force. Further, between the first flange portion 6d and the second flange portion 6a, a compressive force sensing portion 6b as a thin portion elastically deformed by receiving the compressive force is provided integrally therewith. Strain gauges 6c as measuring means for measuring the distortion of the sensing section 6b when receiving the compressive force are attached to the sensing section 6b at equal intervals around the circumference, for example, at four places, and converted into electric signals by a bridge circuit. And measure the load. In the present embodiment, the sensitivity is increased by using the sensing portion 6b as a thin portion, and a space for disposing the strain gauge 6c is secured.

The sensing portion 6b includes a first flange portion 6d,
Since the second flange portion 6a and the sensing portion 6b are fixed to the lower end portion of the cover member 5 as an integral tubular body, the first flange portion 6d and the second flange portion 6a are formed as a part of the cover member 5. It constitutes a thin portion provided between them. The strain gauge 6c is provided on the sensing portion 6b of the load converter 6 and has a tension shaft 9 based on the amount of strain (deformation) in the thrust direction.
Is measured.

FIG. 13 is a block diagram of an electrical unit for this measurement. The electrical unit 25 includes an amplifier 25a
, An A / D conversion unit 25b, a control unit 26, a display unit 25c, and a switch unit 21.

As shown in FIG. 14, the control means 26 comprises a storage means 26a, a comparing means 26b, a counting means 26c, a reverse rotation time determining means 26d, a control signal generating means 26e, and a mode switching means 26f. And can be configured using a microcomputer. The storage unit 26a can store one or both of the set value of the tensile force and the measured value of the tensile force.

The comparing means 26b can compare the measured value measured by the measuring means 6c with the set value stored in the storage means 26a. Also, the comparison means 26b
Compares the measured value stored in the storage means 26a with the measured value subsequently measured by the measuring means 6c.

The counting means 26c includes a switch 21
The rotation time based on the number of rotations from turning on of the motor 20 to stopping the motor 20 can be counted. The reverse rotation time determination means 26d can determine the reverse rotation time of the motor 20 from the rotation time based on the number of rotations counted by the counting means 26c.

The control signal generating means 26e can send a measurement start signal to the strain gauge 6c and send a rotation drive signal to the motor 20. The mode switching means 26f is provided in a break value measurement mode (step S
5 to 7), an intensity value measurement mode (modes in steps S8 to S11 described later), and a peak value measurement mode (modes in steps S12 to S17 described later).

FIG. 26 is a flowchart showing the control program. When the program is executed, in step S1, the motor 20 is started and rotates at a low speed until a predetermined time in step S2 elapses, and after the predetermined time elapses, the process proceeds to step S3. Step S3
Then, the counting means 26c is operated, and the process proceeds to step S4. In step S4, the rotation speed of the motor 20 is increased to rotate at high speed, and the process proceeds to step S5.

[0209] In step S5, the tensile force is measured based on an electric signal output from the strain gauge 6c and proportional to the tensile force of the screw member, and the flow advances to step S6. Step S6
Then, it is determined whether or not a break has occurred based on a sudden change in the electric signal output from the strain gauge 6c. If the break has occurred, the process proceeds to step S7, and if not, the process proceeds to step S8. In step S7, the measured value is displayed on the display unit 25c as a break value, and the process proceeds to step S18. In step S8, the tensile force is measured based on an electric signal output from the strain gauge 6c and proportional to the tensile force of the screw member, and the process proceeds to step S9. In step S9, the measured value of the tensile force is stored in the storage means, and the process proceeds to step S10.

In step S10, the measured value stored in step S9 is compared with the measured tensile force. If the measured value is larger, the process proceeds to step S11, and if not, the process proceeds to step S12. In step S11,
The measured value is displayed as an intensity value on the display means 25c, and the process proceeds to step S18. In step S12, the tensile force is measured based on an electric signal output from the strain gauge 6c and proportional to the tensile force of the screw member, and the process proceeds to step S13. In step S13, the measured value measured in step S12 is stored in the storage unit, and the process proceeds to step S14. Step S
At 14, the tensile force is measured based on an electric signal output from the strain gauge 6c and proportional to the tensile force of the screw member, and the process proceeds to step S15.

In step S15, the stored value (measured value) stored in step S13 is compared with the measured value measured in step S14. If the measured value is larger, the process proceeds to step S16; To step S17
Proceed to. In step S16, the measured value of step S12 stored in the storage unit is updated to the measured value of step S14 and stored, and the process returns to step S14 to measure the tensile force again.

In step S17, the stored value is displayed as a peak value on the display means 25c, and the flow advances to step S18.
In step S18, the drive torque of the motor 20 is reduced. In this way, by reducing the driving torque of the motor 20 in step S18, when the steel plate 19 and the screw member 17 break sharply, the load on the motor can be reduced.

In step S19, the motor 20 is temporarily stopped, and the flow advances to step S20. In step S20, the counting unit 26c operated in step S3 is stopped, and the process proceeds to step S21.

At step S21, the counting means 26c
Motor 2 for a time corresponding to the number of revolutions counted by
0 is reversed, and the process proceeds to step S22. Step S22
Then, the motor 20 is stopped.

Next, the operation of the above embodiment will be described. First, the tensile shaft 9 having a screw diameter suitable for the screw member 17 to be measured is previously attached to the tensile strength tester 1A. At the time of this attachment, first, the holding lid 13 is removed from the knob 13a, then the stopper plug 12 is pulled out from the opening of the knob 2, and then the tension shaft 9 is inserted into the center hole 3a of the rotating shaft 3 from the front end side. Next, the hexagonal head 9a on the base end side is fitted into the hexagonal hole 8a of the driving plate 8 with a hexagonal hole, and then the stopper plug 12 is screwed into the knob 13a. It is brought into contact with the hexagonal head 9a. Thereby, the axial movement of the tension shaft 9 can be prevented.

Then, at the time of measurement, the tensile strength tester 1A
The seating portion of the seating attachment 7 is a steel plate 19 of the object to be measured.
Then, the motor 20 is rotated at a low speed to transmit a rotational force from the worm 14a to the worm gear 3b, and this rotational force is transmitted to the pulling shaft via the rotating shaft 3 and the driving plate 8 with a hexagonal hole. As a result, the tip of the tension shaft 9 is
To screw. The motor 20 is further rotated at a higher speed and the tension shaft 9 is rotated.
When the rotation angle gradually increases from the rotation angle when the seat attachment 7 comes into contact with the steel plate 19, the rotation angle is proportional to the rotation angle due to the screw action between the distal end portion and the screw member 17.
A tensile force in the direction in which the screw member 17 is pulled out is applied to the screw member 17. At this time, the screw member 17 is previously attached to the load converter 6.
Since the seating attachment 7 having an inner diameter larger than the maximum outer diameter of the seating member 7 is attached and the tension shaft 9 is coaxial with the seating attachment 7, the seating portion of the seating attachment 7 is automatically placed around the outer periphery of the screw member 17. And supports the reaction force of the tension shaft 9 via the load transducer 6, the thrust bearing 11, the pedestal 10, and the hexagonal head 9a of the tension shaft 9. Then, the reaction force of the pulling force generated in the pulling shaft 9 is transmitted to the second flange portion 6d of the load converter 6 in the reverse order of the above-described members, and is equal to the pulling force of the screw member 17 in the sensing portion 6b. A reverse compression force is applied. At this time, the thrust bearing 11 functions to reduce the rotational load of the motor 20.

The sensing portion 6b of the load converter 6 is compressed and deformed in the axial direction by the tensile force generated on the tensile shaft 9, and the electric signal proportional to the tensile force of the screw member 17 is generated by the strain gauge 6c. Is output to the electrical unit 25 (see FIG. 13) via the receptacle connector 15, and the electrical signal is amplified by the amplifier 25a of the electrical unit 25, converted into a digital value, and displayed on the display means 25c so as to be directly readable.
The tensile force in the direction in which the screw member 17 is pulled out can be measured.

As described above, in the present embodiment, the seating portion of the seating attachment 7 is brought into contact with the upper surface of the steel plate 19 around the screw member 17 to support the tensile strength tester 1A and to fix the tip end of the tensile shaft 9. Screwed to the screw member 17, the motor 20 is rotated to apply a tensile force P to the screw member 17, and the load sensor 6 provided between the hexagonal head 9 a of the tension shaft 9 and the seating attachment 7 receives the force. The portion 6b is compressed and deformed in the axial direction, and the screw member 1 is formed by the strain gauge 6c and the electrical component 25.
The maximum tensile force, tensile strength, etc. of No. 7 are measured.

Further, the seat attachment 7 and the tension shaft 9 can be attached to and detached from the tensile strength tester 1A so as to correspond to the shape and dimensions of the screw member 17.
Can be easily carried, and there is no need to cut out the screw member 17 from the steel plate 19, so that the strength of the object to be measured can be easily measured at the work site.

Further, in the present embodiment, since the sensing portion 6b is a thin elastic deformation portion and the amount of the deformation is measured by the strain gauge 6c, a simple and very small test device is realized. be able to. Moreover, since the wiring from the load transducer 6 to the electrical unit 25 is provided in the cover member 5 while having a shield structure, it is possible to improve noise resistance and prevent disconnection during work, and to improve the reliability of the measurement result. In addition to greatly improving the operability, the operability of the tester can be extremely improved.

In the tensile strength tester 1A shown in FIG.
The stopper plug 12 is inserted into the hollow portion 3a of the rotating shaft 3 to prevent the pulling shaft 9 from dropping upward. In addition, a seating attachment 7 having an inner diameter larger than the maximum outer diameter of the member to be measured (for example, a welding nut) is screwed into the remaining end of the load converter 6 that supports the tensile peeling force via the thrust bearing 11. . For this reason, the seating attachment 7 can be easily replaced according to the nominal diameter of the nut which is the screw member 17.

In the tensile strength tester of the above embodiment, a screw is screwed to a nut or bolt connected to a metal base material such as an iron plate or a plastic base material such as ABS by welding, caulking, press-fitting, or integral molding. A screw portion 9c for applying a tensile force (axial force) to the nut or bolt according to the principle of the above is provided at the distal end portion, and a rotational drive force is received at a proximal end portion, and a reaction force of the tensile force (axial force) is transmitted to a thrust bearing. A tension shaft 9 having a hexagonal head 9a received via the rotary shaft 11 is rotatably provided at the center of rotation of the rotational force, and is fitted to a rotational force receiving portion of the tensile shaft 9 to apply a rotational force to the tensile shaft 9. Since the hollow rotating shaft 3 having an inner diameter larger than the maximum outer diameter of the hexagonal head 9a of the pulling shaft 9 is rotatably provided coaxially with the pulling shaft 9, the pulling shaft 9 is not loosened. Changes in the nominal diameter of the measured object, wear or breakage of the tension shaft 9 Detachment exchange of drawing axis by, can be performed quickly.

Further, the steel plate 19 to which the screw member 17 is attached
In a tensile strength tester for applying a tensile force in the direction of pulling out the screw member 17 from the steel plate and measuring the tensile strength from the tensile force, a body portion 5a which is a hollow outer cylindrical portion for fixing the seating portion 7c in contact with the steel plate. A hexagonal head 9a via a hollow rotary shaft 3 rotatably held by the trunk 5a and a driving plate 8 with hexagonal holes as connecting means so that rotational power is transmitted from the rotary shaft 3. Are connected to the screw member 17 at the tip end of the shaft portion 9b having a smaller diameter than the hexagonal head 9a, and the tension shaft 9 for applying a tensile force to the screw member 17 in accordance with the rotation angle, and the tension shaft 9 A strain gauge 6c, which is a measuring means for measuring the generated tensile force; a grip 2, which protrudes from a side surface of the body 5a; a motor 20, which is a driving means disposed in the grip 2, a motor 20; Driving force transmitting means (worm 14a, worm Since the wheel 3b) is provided, the tensile strength tester 1A can be set up vertically by holding it sideways while ensuring the exchangeability of the pulling shaft 9 from above, so that the motor 20 can stabilize even if it is automatically driven. Can be.

Further, since the driving force transmitting means is a worm gear device comprising the worm 14a on the motor 20 side and the worm gear 3b on the rotating shaft 3 meshing with the worm 14a, even a small motor 20 can be easily enlarged. It is possible to gain torque, and the degree of freedom of arrangement of the motor 20 increases,
The motor 20 can be housed inside the handle 2 of the tensile strength tester 1A.

As shown in FIG. 16A, the drive shaft 14 of the motor 20 is offset from the center of rotation of the rotary shaft 3, so that the handle 2 is also necessarily offset. When viewed from a direction parallel to 2,
The visibility of the positioning / setting of the tension shaft 9 with respect to the screw member 17 which is the portion to be measured can be improved.

Further, since the motor 20, the worm 14a, the worm gear 3b and the handle 2 are provided on a horizontal axis passing through the center of gravity G of the tensile strength tester 1A, the driving of the motor 20 and the pulling shaft 9 are performed. As a result, stable holding properties can be secured. In addition, stabilization of the center of gravity position G can be achieved.

The rotating shaft 3 is supported by a plurality of bearings 4 spaced apart in the axial direction. Since the worm 14a and the worm gear 3b are arranged between the adjacent bearings 4, a thrust load is generated. Can be suppressed.

As shown in the tenth embodiment of FIGS. 17A and 17B, the driving force transmitting means is a bevel gear 34.
a and 23b, the motor 20 and the handle 2 can be arranged on a horizontal axis passing through the position of the center of gravity with a simple configuration.

The on / off switch 2 of the motor 20
1 is provided in the vicinity of the body 5a of the handle 2, even if the center of gravity is shifted from the center of rotation due to the offset, a force pressing the switch 21 is applied to a position close to the center of gravity G, and the pull by the action of the force is applied. The influence on the strength tester main body can be suppressed.

As shown in the eleventh embodiment of FIG. 17C, the drive shaft 14 is connected to the worm 14a via the universal joint U, and the handle 2 Since the handle portion 2 is provided on a horizontal line passing through the center of rotation, the handle portion 2 is provided on a horizontal line passing through the center of rotation. Therefore, it is possible to suppress the displacement of the center of gravity G, thereby preventing the displacement of the tensile strength tester main body.

As shown in the ninth embodiment in FIG. 16B, the outer cylinder 5a
Since the handle portion 2B is provided, when the center of gravity G fluctuates due to the offset, the holdability can be improved in order to suppress the fluctuation of the tensile strength tester main body due to the fluctuation. Further, as shown in FIG. 16A, by disposing the switch 21 so as to be substantially opposed to the handle portion 2 with the rotation axis K interposed therebetween, the main body does not displace due to the pressing force of the switch 21.

Further, since the second handle portion 2B has a point-symmetrical shape with respect to the handle portion 2 containing the motor 20, it is possible to prevent a change in the center of gravity G due to the offset.

In the tensile strength tester 1A shown in FIG. 27, a driving plate 8 having a hexagonal hole 8a provided at the center thereof with a hexagonal head 9a of a tensioning shaft 9 is fixed to the tip of the rotating shaft 3 with a screw 16. However, in this case, a bottom may be integrally formed at the tip of the rotating shaft 3 and a driving hole (a hexagonal hole in this case) may be provided at the center of the bottom. The drive hole is not limited to a hexagon, and may have any shape as long as a rotational force can be given.

[0234] The tensile strength tester 1A shown in FIG.
Is applied via a motor 20 that drives a tension shaft 9 screwed into the screw member 17, and a tensile force generated on the tension shaft 9 is measured by a tensile strength tester that measures the pull-out strength from the tensile force. For a predetermined time from the start of driving of the strain gauge 6c for measuring the force and the motor 20, that is, the time until the tension shaft 9 and the screw member 17 are screwed, the tension shaft 9 is rotated at a lower speed than the rotational speed at the time of measurement, and Control means 26 for controlling the rotation speed at the time of measurement after the elapse of time, that is, after screwing, so that the tension shaft 9 is measured for a predetermined time from the start of driving of the motor 20. By rotating at a lower speed than the rotation speed of, the screwing of the tension shaft 9 and the screw member 17 is facilitated, and after the predetermined time has passed, the screwing is controlled so that the rotation speed at the time of measurement is obtained. Motor 20 It is possible to be used in the drive means engaged reliably and stably screw, can achieve faster measurement.

[0235] The tensile strength tester 1A is provided on the steel plate 19 to which the screw member 17 is attached.
In a tensile strength tester for applying a pulling force in the pulling-out direction to a screw member 17 via a motor 20 for driving a pulling shaft 9 screwed into a screw member 17 and measuring the pulling strength from the pulling force, a seating portion abutting on a steel plate 19. Hollow body 5a for fixing 7c
And a hollow rotary shaft 3 rotatably held by the body 5a
The hexagonal head 9a is connected via a connecting means so that the rotating power is transmitted from the rotating shaft 3, and is screwed to the screw member 17 at the tip end of the shaft portion 9b having a smaller diameter than the hexagonal head 9a. A pulling shaft 9 for applying a pulling force corresponding to the rotation angle to the screw member 17, a strain gauge 6 c for measuring a pulling force generated on the pulling shaft 9, and a predetermined time from the start of driving of the motor 20, that is, the pulling shaft 9. Until the screw member 17 is screwed, the tension shaft 9 is rotated at a lower speed than the rotation speed at the time of measurement, and after a predetermined time elapses, that is, after the screwing, the control means 26 controls the rotation speed at the time of measurement. Therefore, at the connecting portion between the rotating shaft 3 and the pulling shaft 9, the turning power of the rotating shaft 3 can be transmitted to the pulling shaft 9 while absorbing the reaction force, and It is possible to prevent the loosening of the portion, For a predetermined time, the tension shaft 9 is rotated at a lower speed than the rotation speed at the time of measurement, thereby facilitating the screwing of the tension shaft 9 and the screw member 17. As a result, the screwing can be surely and stably performed even by using a driving means such as the motor 20, and the measurement can be speeded up.

The tensile strength tester has a storage means 26a for storing the set value of the tensile force, and a comparing means for comparing the measured value measured by the strain gauge 6c with the set value stored in the storage means 26a. 26b and a control signal generating means 26e for generating a control signal for stopping the motor 20 based on the comparison result of the comparing means 26b.
Therefore, the strength value can be measured based on the set value that guarantees safety, and it is possible to correspond to an object to be measured that is evaluated with the strength at a certain set value. Further, since there is no need to break the workpiece, there is no possibility that the screw member 17 bites into the tension shaft 9.

Further, the tensile strength tester 1A stops the motor 20 when the peak value / rupture value of the tensile force is measured before reaching the set tensile force value stored by the storage means 26a. The control means 26 controls the motor 20 to stop the motor 20 unnecessarily when the data is measured to be broken early due to poor strength or the like and the data is broken. .

Further, since the tensile strength tester 1A includes the display means 25c for displaying the measured peak value / break value, the peak value / break value can be displayed.
This is a small tensile strength tester that can be easily carried to a molding work site or the like to easily measure the pull-out force and inspect the pull-out strength.

The tensile strength tester 1A is provided with a storage means 2 for storing a measured value measured by the strain gauge 6c.
6a, a comparing means 26b for comparing the measured value stored in the storing means 26a with a measured value thereafter measured by the strain gauge 6c, and the motor 20 is stopped based on the comparison result of the comparing means 26b. Since the control unit 26 includes the control signal generation unit 26e that generates the control signal, the motor 20 can be stopped based on the comparison result of the comparison unit 26b.

Further, the strength of the measured object can be known only by knowing the intensity peak value, and the tensile strength tester 1A is capable of storing the set value of the tensile force. 26a, storage means 26a for storing the tensile force measurement value measured by the strain gauge 6c, and comparing means 2 for comparing the stored tensile force measurement value with the tensile force set value.
6b, when the measured tensile force is larger than the set tensile force, the set tensile force is updated to the measured tensile force and stored as the updated set tensile force, and the tensile force is measured again. And a control signal generating means for generating a control signal such that the updated tensile force set value is displayed on the display means as a peak value when the updated tensile force set value is larger than the control means. Therefore, if the measured value is lower than the stored value, the peak value is known, and the peak value can be measured by using the stored value as the peak value, whereby the intensity of the measured object can be measured.

Further, the tensile strength tester 1A controls the control signal from the control signal generation means 26e so that the control means 26 reversely rotates the motor 20 after displaying the peak value and stops the motor 20 after the reverse rotation. Therefore, it is easy to remove the screw member 17 from the tension shaft 9.

The tensile strength tester 1A has a storage means 26a for storing a set value of the tensile force and a storage means 26 for storing a measured value of the tensile force measured by the strain gauge 6c.
a, a comparing means 26b for comparing the stored measurement value and the set value, and a control signal generating means 26e for generating a control signal from the control signal generating means 26e to stop the motor 20 based on the comparison result of the comparing means 26b. The control means 26 for controlling, and if the peak value / rupture value of the tensile force is measured before reaching the tensile force set value stored by the storage means 26a, the measured peak value / rupture value is converted to the peak value / rupture value. When the measured value of the tensile force is larger than the set value of the tensile force, the set value of the tensile force is updated to the measured value of the tensile force, and the updated tensile force is displayed. The tensile force is measured again while being stored in the storage means 26a as a set value, and when the updated tensile force set value is larger, the updated tensile force set value is displayed as a peak value on the display means 2.
5c to control the driving means so as to stop the driving means. Therefore, before reaching the set tensile force value stored by the storage means 26a, the peak value of the tensile force /
When the break value is measured, the measured peak value / break value is displayed on the display means 25c as the peak value / break value and the motor 20 is stopped, so that the peak value / break value is reached before reaching the tensile force set value. Even when the break value is measured, the peak value / break value can be measured. If the measured tensile force value is larger than the set tensile force value, the set tensile force value is updated to the measured tensile force value and updated. The stored tensile force set value is stored in the storage means 26a, and the tensile force is measured again.
When the updated set value of the pulling force is larger, the updated set value of the pulling force is displayed as a peak value on the display means 25c and the motor 20 is stopped, so that the peak value can be known.

The tensile strength tester 1A controls the control means 26 so that the control signal is generated from the control signal generation means 26e so that the motor 20 is rotated in the reverse direction before the motor 20 is stopped. It is easy to remove the screw member 17 from.

The tensile strength tester 1A includes a switch 21 for turning on / off the motor 20, a counting means 26c for counting the rotation time from the turning on of the switch 21 to the stop of the motor 20, and a counting means 26c. Reverse rotation time determining means 26d for determining the reverse rotation time of the motor 20 based on the determined rotation time. After the set value / peak value is measured, the control means 26 determines the reverse rotation time by the reverse rotation time determining means 26d. The motor 20 is reversely rotated based on the reverse rotation time, and the control signal is generated from the control signal generating means 26e so as to stop the motor 20 after the reverse rotation time has elapsed. Motor 2 based on the forward rotation time of the motor 20
0 can be reversely rotated, and the screw member 1 can be
It is very easy to remove 7.

FIG. 35 is a front sectional view showing a tensile strength tester 1B according to the sixteenth embodiment. In the tensile strength tester 1B of the sixteenth embodiment, the motor driving and control parts are the same as those of the tensile strength tester 1A of the twelfth embodiment.

The seat attachment 47 is screwed to the lower end of the load converter 6 which is a compressive force sensing portion. The screw portion 47d of the seat attachment 47 is formed in a reverse thread to the screw portion 9c of the tension shaft 9. Further, the seat attachment 7 is formed with an uneven portion 47h, which is a locking means with which the broken nut 17 comes into contact. Further, the portion including the seating portion 47c, which is the tip of the seating attachment 47, is magnetized to be a magnet.

The tension shaft 9 is formed to have a length such that its tip is located above the lower end of the seat attachment 47. That is, the distal end of the tension shaft 9 is located farther back than the seating surface 47c at the lower end of the seating attachment 47.

The regulating member 4 which comes into contact with the holding lid 13
1 is provided. The regulating member 41 regulates the amount of retraction of the tension shaft 9. In other words, the hexagonal head 9a of the tension shaft 9 is not detached from the driving plate 8 with hexagonal holes. A spring 42, which is an elastic member, is disposed between the regulating member 41 and the tension shaft 9 so as to urge the tension shaft 9 downward. Instead of the spring 42, another elastic member such as rubber may be used.

FIG. 30 is a view showing a seat attachment and members to which the seat attachment is screwed.
Is a perspective view of a member to which the seating attachment is screwed, (B)
7 is a perspective view of a seating attachment, (C) is a cross-sectional view of a modification of the seating attachment, and (D) is a cross-sectional view of another modification of the seating attachment.

As shown in FIG. 30A, a ring-shaped fixing member 43 provided between the body 5a and the seating attachment 47 and press-fitted and fixed to the body 5a has a load converter 6 on its inner periphery. And a screw portion 43a for screwing the screw portion 6e of the seat attachment 47 with the screw portion 47d of the seat attachment 47. The screw portions 43a are formed at equal intervals in the circumferential direction and are separated from each other.

As shown in FIG. 30 (B), the seating attachment 47 has a hole 47b into which the tension shaft 9 fits, and screw portions 47d screwed to the screw portion 43a are separated from each other at equal intervals in the circumferential direction. It is formed. The fixing member 43 and the seat attachment 47 are screwed together with the screw portion 43a and the screw portion 47d, and are rotated by a predetermined angle around the axis, so that the screwing is released and the positions can be adjusted in the axial direction. .

As shown in FIG. 30C, a seating attachment 47A may be provided by providing a taper portion 47f as a locking means instead of the above-mentioned uneven portion 7h.
As shown in FIG. 0 (D), for example, a hexagonal hole 47g, which is a locking means that can be engaged with the screw member 17 around the axis, may be provided as the seating attachment 47B.

As described above, according to the tensile strength tester, the steel plate 19 to which the screw member 17 is attached
In the tensile strength tester for applying a tensile force in the direction of pulling out the screw member 17 from the tension member 9 through the tension shaft 9 and measuring the tensile strength from the tensile force, the seating attachments 7 and 47 abutting on the steel plate 19 have the trunk 5a. Since the screw is screwed to the compression force sensing portion 6b, the height adjustment is facilitated by rotating the seating attachments 7, 47, and the tension shaft 9 is brought into contact with the screw member 17 and screwed first. At this time, the seating attachments 7, 47 can be brought into contact with the steel plate 19, and the main body can be stably screwed without shaking. Further, since the seat attachments 7, 47 are attached by screwing, the seat attachments 7, 47 can be easily replaced.

According to the tensile strength tester, the threaded portions 7d and 47d of the seat attachments 7 and 47 are
And the screw portion 9c of the seating attachment 7, 47 and the screw portion 9c of the tension shaft 9 can be prevented from rotating together.

According to the tensile strength tester, the tensile shaft 9
Is located on the back side of the tip of the seating attachment 7, 47, so that it is easier to adjust the back side, the span is shorter and the length for adjustment is shorter, 19 is easy to set.

Further, according to the tensile strength tester, since the locking members 7h and 47h for locking the screw member 17 are provided at the contact portions of the screw members 17 of the seat attachments 7 and 47, the seat attachments 7 and 47 can be attached. When and after the contact with the steel plate 19, the distal ends of the seating attachments 7, 47 are sucked by the steel plate 19, so that the setability to the steel plate 19 can be improved.

According to the tensile strength tester, since at least the distal end of the seating attachment 4, 47 is a magnet, the seating attachment 4, 47 is brought into contact with the steel plate 19 and after the contacting. Is sucked by the steel plate 19, so that the setability to the steel plate 19 can be improved.

Further, according to the tensile strength tester, the inner diameter shape 7, 47 of the seating attachment engages with the outer diameter shape of the screw member 17 at least in the rotation direction. The screw member 17 can be removed from the screw.

According to the tensile strength tester, the threaded portions 7d and 47d of the seating attachments 7 and 47 are formed at predetermined intervals in a part of the circumferential direction, and the threaded portions of the fixing member 43 of the body 5a. 43a (the thread portion of the load converter 6) is also formed at a predetermined interval in a part of the circumferential direction, and the seating attachments 7, 47 and the body portion 5a are formed so as to be freely disengageable in the axial direction according to the rotation angle of each other. Since the seating attachments 7, 47 and the body 5a / load converter 6 are formed so as to be axially disengageable in accordance with the rotation angle of each other, the seating attachments 7, 47 are moved up and down. Then, the height can be quickly adjusted.

Further, according to the tensile strength tester, a tensile force in the direction of pulling out the screw member 17 from the steel plate 19 is applied to the steel plate 19 to which the screw member 17 is attached via the tensile member 9, and the pulling strength is calculated from the tensile force. In the tensile strength tester for measuring, the distal end of the tensile member 9 is disposed deeper than the distal ends of the seating attachments 7, 47 abutting on the steel plate 19, so that the main body is stably screwed without shaking. Therefore, the tension member 9 can be connected to the screw member 1.
7 is easy to set.

According to the tensile strength tester, since at least the distal ends of the seating attachments 7 and 47 are magnets, the main body can be stably screwed together without shaking. It is easy to set on the screw member 17 and the setability on the steel plate 19 is improved.

Further, according to the tensile strength tester, since the inner diameter of the seat attachments 4, 47 is formed so as to engage with the outer diameter of the screw member 17 at least in the rotational direction, the seat attachment 7 , 47 can be removed from the tension member 9.

According to the tensile strength tester, a tensile force in the direction of pulling out the screw member 17 from the steel plate 19 is applied to the steel plate 19 to which the screw member 17 is attached, and the tensile shaft 9 screwed to the screw member 17 is driven. In a tensile strength tester for measuring pull-out strength from a tensile force applied via a motor 20, a hollow outer cylinder member 5a for fixing a seating portion 7c abutting on a steel plate 19 and a rotatably held by the outer cylinder member 5a. A hexagonal head 9a is connected via a hollow rotary shaft 3 and a driving plate 8 with a hexagonal hole so that rotational power is transmitted from the rotary shaft 3, and a shaft portion having a smaller diameter than the hexagonal head 9a. A tension shaft 9 which is screwed to the screw member 17 at the distal end and applies a tensile force to the screw member 17 according to the rotation angle.
And the elastic member 42 for elastically holding the hexagonal head 9a of the tension shaft 9 via the stopper 13 so that the hexagonal head 9a The tension shaft 9 held by the elastic member 42 is retracted, the impact of the contact is reduced, and the reliability of screwing is greatly increased.

Further, according to the tensile strength tester, since the amount of retraction of the tensile shaft 9 is the amount of retraction of the seating attachments 7, 47 contacting the steel plate 19, the seating attachments 7, 47 contact the steel plate 19. It is possible.

According to the tensile strength tester, the stopper 41 restricts the amount of pulling of the tension shaft 9 into the stopper 13.
Since a is provided, the retracting amount of the tension shaft 9 can be regulated by the regulating means 41a.

According to the tensile strength tester, since at least the tip of the seat attachment is a magnet,
When the seat attachments 7 and 47 come into contact with the steel plate 19 and after the abutment, the distal ends of the seat attachments 7 and 47 are sucked by the steel plate 19, so that the setability to the steel plate 19 can be improved.

According to the tensile strength tester, at least the distal end of the tensile shaft 9 is magnetized, so that the screw member 17 can easily contact the distal end of the tensile shaft 9.

According to the tensile strength tester, a strain gauge 6c for applying a tensile force in the direction of pulling out the screw member 17 from the steel plate 19 to the steel plate 19 to which the screw member 17 is attached, and measuring the pulling strength from the tensile force is provided. A storage unit 26a for storing the measured tensile force measured by the strain gauge 6c, a comparing unit 26b for comparing the stored measured tensile force value with the set tensile force value, If the value is larger than the set tension value, the set tension value is updated to the measured tension value and stored as the updated set tension value. If the value is larger, the updated pulling force set value is displayed as a peak value on the display means 25c, and the control means for controlling the motor 20 to reduce the driving torque is reduced. Since a 26, it is possible to measure the peak value, when the sudden rupture, it is possible to reduce the load on the motor 20.

Further, according to the tensile strength tester, the control means 26 controls the motor 20 to rotate in the reverse direction after the display, and to stop the motor 20 after the reverse rotation.
It is easy to remove the screw member from the tension member.

(10) (Regarding Display) In FIG. 19, the display unit 131 amplifies the electric signal output from the strain gauge 126, converts the electric signal into a digital signal, holds the peak signal, and displays the peak value at all times. Has become.

Further, the display unit 131 is provided with a mode selection switch. According to the mode selection switch, (A) in the case of the setting mode, at least the set value and the measured value measured at any time are displayed. In the peak value measurement mode, at least the peak value is displayed. (C) In the break value measurement mode, at least the break value is displayed. Of course, this display is the same as in the embodiment shown in FIGS.
It is also possible to display in a manually rotated embodiment such as the embodiment shown in FIGS.

(11) (Regarding the Seated Attachment) The seated attachment can be applied to the embodiment of the manual rotation like the embodiment shown in FIGS. 1 to 10 and the embodiment shown in FIGS. .

As shown in FIG. 27, the seat attachment 7 is screwed to the lower end of the load converter 6 which is a compressive force sensing portion. Then, the screw portion 7 of the seat attachment 7
d is formed in the threaded portion 9c of the tension shaft 9 and the reverse screw. The seat attachment 7 has a broken nut 17.
A concave / convex portion 7h, which is a locking means with which abutment is provided, is formed. Further, the portion including the seating surface 7c, which is the tip of the seating attachment 7, is magnetized to be a magnet. The tension shaft 9 is formed to have a length such that its tip is located above the lower end of the seating attachment 7. That is, the distal end of the pulling shaft 9 is disposed on the back side of the seating surface 7c at the lower end of the seating attachment 7. Further, at least the tip of the tension shaft 9 is magnetized.

[0274] The tensile strength tester 1A shown in FIG.
Is applied via a motor 20 that drives a tension shaft 9 screwed into the screw member 17, and a tensile force generated on the tension shaft 9 is measured by a tensile strength tester that measures the pull-out strength from the tensile force. For a predetermined time from the start of driving of the strain gauge 6c for measuring the force and the motor 20, that is, the time until the tension shaft 9 and the screw member 17 are screwed, the tension shaft 9 is rotated at a lower speed than the rotational speed at the time of measurement, and Control means 26 for controlling the rotation speed at the time of measurement after the elapse of time, that is, after screwing, so that the tension shaft 9 is measured for a predetermined time from the start of driving of the motor 20. By rotating at a lower speed than the rotation speed of, the screwing of the tension shaft 9 and the screw member 17 is facilitated, and after the predetermined time has passed, the screwing is controlled so that the rotation speed at the time of measurement is obtained. Motor 20 It is possible to be used in the drive means engaged reliably and stably screw, can achieve faster measurement.

Further, the tensile strength tester 1A is configured such that the steel plate 19 to which the screw member 17 is attached
In a tensile strength tester for applying a pulling force in the pulling-out direction to a screw member 17 via a motor 20 for driving a pulling shaft 9 screwed into a screw member 17 and measuring the pulling strength from the pulling force, a seating portion abutting on a steel plate 19. Hollow body 5a for fixing 7c
And a hollow rotary shaft 3 rotatably held by the body 5a
The hexagonal head 9a is connected via a connecting means so that the rotating power is transmitted from the rotating shaft 3, and is screwed to the screw member 17 at the tip end of the shaft portion 9b having a smaller diameter than the hexagonal head 9a. A pulling shaft 9 for applying a pulling force corresponding to the rotation angle to the screw member 17, a strain gauge 6 c for measuring a pulling force generated on the pulling shaft 9, and a predetermined time from the start of driving of the motor 20, that is, the pulling shaft 9. Until the screw member 17 is screwed, the tension shaft 9 is rotated at a lower speed than the rotation speed at the time of measurement, and after a predetermined time elapses, that is, after the screwing, the control means 26 controls the rotation speed at the time of measurement. Therefore, at the connecting portion between the rotating shaft 3 and the pulling shaft 9, the turning power of the rotating shaft 3 can be transmitted to the pulling shaft 9 while absorbing the reaction force, and It is possible to prevent the loosening of the portion, For a predetermined time, the tension shaft 9 is rotated at a lower speed than the rotation speed at the time of measurement, thereby facilitating the screwing of the tension shaft 9 and the screw member 17. As a result, the screwing can be surely and stably performed even by using a driving means such as the motor 20, and the measurement can be speeded up.

The tensile strength tester has a storage means 26a for storing the set value of the tensile force, and a comparing means for comparing the measured value measured by the strain gauge 6c with the set value stored in the storage means 26a. 26b and a control signal generating means 26e for generating a control signal for stopping the motor 20 based on the comparison result of the comparing means 26b.
Therefore, the strength value can be measured based on the set value that guarantees safety, and it is possible to correspond to an object to be measured that is evaluated with the strength at a certain set value. Further, since there is no need to break the workpiece, there is no possibility that the screw member 17 bites into the tension shaft 9.

The tensile strength tester 1A stops the motor 20 when the peak value / rupture value of the tensile force is measured before reaching the set tensile force value stored by the storage means 26a. The control means 26 controls the motor 20 to stop the motor 20 unnecessarily when the data is measured to be broken early due to poor strength or the like and the data is broken. .

Further, since the tensile strength tester 1A has the display means 25c for displaying the measured peak value / break value, the peak value / break value can be displayed.
This is a small tensile strength tester that can be easily carried to a molding work site or the like to easily measure the pull-out force and inspect the pull-out strength.

[0279] Further, the tensile strength tester 1A is provided with a storage means 2 for storing a measurement value measured by the strain gauge 6c.
6a, a comparing means 26b for comparing the measured value stored in the storing means 26a with a measured value thereafter measured by the strain gauge 6c, and the motor 20 is stopped based on the comparison result of the comparing means 26b. Since the control unit 26 includes the control signal generation unit 26e that generates the control signal, the motor 20 can be stopped based on the comparison result of the comparison unit 26b.

Further, the strength of the measured object can be known only by knowing the intensity peak value, and the tensile strength tester 1A is capable of storing the set value of the tensile force. 26a, storage means 26a for storing the tensile force measurement value measured by the strain gauge 6c, and comparing means 2 for comparing the stored tensile force measurement value with the tensile force set value.
6b, when the measured tensile force is larger than the set tensile force, the set tensile force is updated to the measured tensile force and stored as the updated set tensile force, and the tensile force is measured again. And a control signal generating means for generating a control signal such that the updated tensile force set value is displayed on the display means as a peak value when the updated tensile force set value is larger than the control means. Therefore, if the measured value is lower than the stored value, the peak value is known, and the peak value can be measured by using the stored value as the peak value, whereby the intensity of the measured object can be measured.

Also, the tensile strength tester 1A controls the control signal from the control signal generation means 26e so that the control means 26 reversely rotates the motor 20 after displaying the peak value and stops the motor 20 after the reverse rotation. Therefore, it is easy to remove the screw member 17 from the tension shaft 9.

The tensile strength tester 1A has a storage means 26a for storing the set value of the tensile force and a storage means 26 for storing the measured value of the tensile force measured by the strain gauge 6c.
a, a comparing means 26b for comparing the stored measurement value and the set value, and a control signal generating means 26e for generating a control signal from the control signal generating means 26e to stop the motor 20 based on the comparison result of the comparing means 26b. The control means 26 for controlling, and if the peak value / rupture value of the tensile force is measured before reaching the tensile force set value stored by the storage means 26a, the measured peak value / rupture value is converted to the peak value / rupture value. When the measured value of the tensile force is larger than the set value of the tensile force, the set value of the tensile force is updated to the measured value of the tensile force, and the updated tensile force is displayed. The tensile force is measured again while being stored in the storage means 26a as a set value, and when the updated tensile force set value is larger, the updated tensile force set value is displayed as a peak value on the display means 2.
5c to control the driving means so as to stop the driving means. Therefore, before reaching the set tensile force value stored by the storage means 26a, the peak value of the tensile force /
When the break value is measured, the measured peak value / break value is displayed on the display means 25c as the peak value / break value and the motor 20 is stopped, so that the peak value / break value is reached before reaching the tensile force set value. Even when the break value is measured, the peak value / break value can be measured. If the measured tensile force value is larger than the set tensile force value, the set tensile force value is updated to the measured tensile force value and updated. The stored tensile force set value is stored in the storage means 26a, and the tensile force is measured again.
When the updated set value of the pulling force is larger, the updated set value of the pulling force is displayed as a peak value on the display means 25c and the motor 20 is stopped, so that the peak value can be known.

The tensile strength tester 1A controls the control means 26 so that the control signal is generated from the control signal generation means 26e so as to rotate the motor 20 in the reverse direction before the motor 20 is stopped. It is easy to remove the screw member 17 from.

The tensile strength tester 1A includes a switch 21 for turning on / off the motor 20, a counting means 26c for counting the rotation time from the turning on of the switch 21 to the stop of the motor 20, and a counting means 26c. Reverse rotation time determining means 26d for determining the reverse rotation time of the motor 20 based on the determined rotation time. After the set value / peak value is measured, the control means 26 determines the reverse rotation time by the reverse rotation time determining means 26d. The motor 20 is reversely rotated based on the reverse rotation time, and the control signal is generated from the control signal generating means 26e so as to stop the motor 20 after the reverse rotation time has elapsed. Motor 2 based on the forward rotation time of the motor 20
0 can be reversely rotated, and the screw member 1 can be
It is very easy to remove 7.

FIG. 28 is a front sectional view showing a tensile strength tester 1B according to the thirteenth embodiment. The seat attachment 47 is screwed to a lower end of the load converter 6 which is a compressive force sensing portion. The screw portion 47d of the seat attachment 47 is formed in a reverse thread to the screw portion 9c of the tension shaft 9. Further, the seat attachment 7 is formed with an uneven portion 47h, which is a locking means with which the broken nut 17 comes into contact. Further, the portion including the seating surface 47c, which is the tip of the seating attachment 47, is magnetized to be a magnet.

The tension shaft 9 is formed to have such a length that its tip is located above the lower end of the seat attachment 47. That is, the distal end of the tension shaft 9 is located farther back than the seating surface 47c at the lower end of the seating attachment 47.

[0287] The regulating member 4 which comes into contact with the holding lid 13 is also provided.
1 is provided. The regulating member 41 regulates the amount of retraction of the tension shaft 9. In other words, the hexagonal head 9a of the tension shaft 9 is not detached from the driving plate 8 with hexagonal holes.

A spring 42, which is an elastic member, is disposed between the regulating member 41 and the tension shaft 9 so as to urge the tension shaft 9 downward. Instead of the spring 42, another elastic member such as rubber may be used.

FIG. 30 is a view showing a seat attachment and members to which the seat attachment is screwed.
Is a perspective view of a member to which the seating attachment is screwed, (B)
7 is a perspective view of a seating attachment, (C) is a cross-sectional view of a modification of the seating attachment, and (D) is a cross-sectional view of another modification of the seating attachment.

As shown in FIG. 30A, a ring-shaped fixing member 43 provided between the body 5a and the seating attachment 47 and press-fitted and fixed to the body 5a has a load converter 6 on its inner periphery. And a screw portion 43a for screwing the screw portion 6e of the seat attachment 47 with the screw portion 47d of the seat attachment 47. The screw portions 43a are formed at equal intervals in the circumferential direction and are separated from each other.

As shown in FIG. 30 (B), the seat attachment 47 has a hole 47b into which the tension shaft 9 fits, and the screw portions 47d screwed to the screw portions 43a are spaced apart from each other at equal intervals in the circumferential direction. It is formed. The fixing member 43 and the seat attachment 47 are screwed together with the screw portion 43a and the screw portion 47d, and are rotated by a predetermined angle around the axis, so that the screwing is released and the positions can be adjusted in the axial direction. .

As shown in FIG. 30 (C), a tapered portion 47f as a locking means may be provided in place of the above-mentioned uneven portion 7h. As shown in FIG. For example, a hexagonal hole 47g, which is a locking means capable of engaging around the axis, may be provided.

FIG. 29 is a front sectional view showing a tensile strength tester according to the fourteenth embodiment. In the tensile strength tester 1C of the fourteenth embodiment, the motor drive and control part of the tensile strength tester 1A of the twelfth embodiment is applied to the tensile strength tester 1B of the thirteenth embodiment.

As described above, according to the tensile strength tester, a tensile force in the direction of pulling out the screw member 17 from the steel plate 19 is applied to the steel plate 19 to which the screw member 17 is attached via the tensile shaft 9. In the tensile strength tester for measuring the tensile strength from the tensile force, the seating attachments 7, 47 abutting on the steel plate 19 are screwed to the body 5a / load converter 6, so that the seating attachments 7, 47 are provided. By rotating the shaft, the height adjustment becomes easy, the tensioning shaft 9 is brought into contact with the screw member 17, and the seating attachments 7, 47 can be brought into contact with the steel plate 19 at the time of first screwing, so that the main body is unstable. And can be screwed together stably. Further, since the seat attachments 7, 47 are attached by screwing, the seat attachments 7, 47 can be easily replaced.

Further, according to the tensile strength tester, since the threaded portions 7d and 47d of the seating attachments 7 and 47 are formed in the reverse thread with the threaded portion 9c of the tension shaft 9, the seating attachments 7 and 47 are formed. The screw portions 7d and 47d and the screw portion 9c of the tension shaft 9 can be prevented from rotating together.

Further, according to the tensile strength tester, since the distal end of the tensile shaft 9 is located at the back of the distal ends of the seating attachments 7 and 47, the distal end is adjusted more preferably at the back. It is easy to set the length on the steel plate 19 because the span is short and the length for adjustment is short.

Further, according to the tensile strength tester, since the locking members 7h and 47h for locking the screw member 17 are provided at the contact portions of the screw members 17 of the seat attachments 7 and 47, the seat attachments 7 and 47 are provided. The tip of the seating attachment 7, 47 is attracted to the steel plate 19 when and after contact with the steel plate 19, so that the setability to the steel plate 19 can be improved.

According to the tensile strength tester, since at least the tip of the seating attachment 4, 47 is a magnet, the seating attachment 4, 47 is brought into contact with the steel plate 19 and after the seating attachment 4, 47 is brought into contact with the steel plate 19. 47
Is sucked by the steel plate 19, so that the setability to the steel plate 19 can be improved.

Further, according to the tensile strength tester, the inner diameter shape 7, 47 of the seating attachment engages with the outer diameter shape of the screw member 17 at least in the rotating direction. 9 to screw member 17
Can be removed.

According to the tensile strength tester, the threaded portions 7d and 47d of the seat attachments 7 and 47 are formed at predetermined intervals in a part of the circumferential direction, and the trunk portion 5a is formed.
The screw portion 43a of the fixing member 43 (the screw portion of the load converter 6) is also formed at a predetermined interval in a part of the circumferential direction. The seating attachments 7, 47 and the body 5a / load converter 6 are formed so as to be axially detachable in accordance with the rotation angle of each other, so that the seating attachment 7, , 47 can be moved up and down to quickly adjust the height.

According to the tensile strength tester, a tensile force in a direction of pulling out the screw member 17 from the steel plate 19 is applied to the steel plate 19 to which the screw member 17 is attached, via the tensile shaft 9.
In the tensile strength tester for measuring the pull-out strength from the tensile force, the distal end of the tensile shaft 9 is located behind the distal ends of the seating attachments 7, 47 abutting on the steel plate 19. Since the distal end portion is disposed deeper than the distal end portions of the seat attachments 7 and 47 abutting on the steel plate 19, the tensile tester main body can be stably screwed without shaking.

Further, according to the tensile strength tester, since at least the distal ends of the seating attachments 7 and 47 are magnets, the body can be stably screwed without shaking. Therefore, it is easy to set the tension shaft 9 to the screw member 17 and the setting property to the steel plate 19 is improved.

Further, according to the tensile strength tester, the inner diameter of the seat attachments 7, 47 is formed so as to engage with the outer diameter of the screw member 17 at least in the rotational direction. , 47 can remove the screw member 17 from the tension shaft 9. Thereby, if the screw member 17 and the steel plate 19 are broken, it is possible to prevent the screw member 17 on the back side between the tension shaft 9 and the seating attachments 7 and 47 from being difficult to be dislocated.

(In the case of a tensile strength tester aiming at easy setting)

As described above, according to the tensile strength tester of FIG. 27, the tensile force in the direction of pulling out the screw member 17 from the steel plate 19 is applied to the steel plate 19 to which the screw member 17 is attached via the tensile shaft 9. In addition, in the tensile strength tester for measuring the tensile strength from the tensile force, the seating attachments 7, 47 abutting on the steel plate 19 are screwed to the body 5a / load converter 6, so that the seating attachments 7 , 47
By rotating the shaft, the height adjustment becomes easy, the tensioning shaft 9 is brought into contact with the screw member 17, and the seating attachments 7, 47 can be brought into contact with the steel plate 19 at the time of first screwing, so that the main body is unstable. And can be screwed together stably. Further, since the seat attachments 7, 47 are attached by screwing, the seat attachments 7, 47 are attached.
Replacement of 47 is easy.

According to the tensile strength tester, the threaded portions 7d and 47d of the seat attachments 7 and 47 are
And the screw portion 9c of the seating attachment 7, 47 and the screw portion 9c of the tension shaft 9 can be prevented from rotating together.

According to the tensile strength tester, the tensile shaft 9
Is located on the back side of the tip of the seating attachment 7, 47, so that it is easier to adjust the back side, the span is shorter and the length for adjustment is shorter, 19 is easy to set.

Further, according to the tensile strength tester, since the locking means 7h and 47h for locking the screw member 17 are provided at the abutting portions of the screw members 17 of the seat attachments 7 and 47, the seat attachments 7 and 47 can be used. When and after the contact with the steel plate 19, the distal ends of the seating attachments 7, 47 are sucked by the steel plate 19, so that the setability to the steel plate 19 can be improved.

According to the tensile strength tester, since at least the distal end of the seating attachment 4, 47 is a magnet, the seating attachment 4, 47 is brought into contact with the steel plate 19 and after the contact. Is sucked by the steel plate 19, so that the setability to the steel plate 19 can be improved.

Further, according to the tensile strength tester, the inner diameter shape 7, 47 of the seating attachment engages with the outer diameter shape of the screw member 17 at least in the rotating direction. The screw member 17 can be removed from the screw.

Further, according to the tensile strength tester, the threaded portions 7d and 47d of the seat attachments 7 and 47 are formed at predetermined intervals in a part of the circumferential direction, and the threaded portions of the fixing member 43 of the body 5a. 43a (the thread portion of the load converter 6) is also formed at a predetermined interval in a part of the circumferential direction, and the seating attachments 7, 47 and the body portion 5a are formed so as to be freely disengageable in the axial direction according to the rotation angle of each other. Since the seating attachments 7, 47 and the body 5a / load converter 6 are formed so as to be axially disengageable in accordance with the rotation angle of each other, the seating attachments 7, 47 are moved up and down. Then, the height can be quickly adjusted.

(In the Case of a Tensile Strength Tester Aimed at Improving the Removability of the Screw Member) As shown in FIG. 31, the seating attachment 7 is, for example, a lower end portion of an outer cylindrical portion 5a which is a body portion of the cover member 5. The seat attachment 7 is driven in the vertical direction, that is, in the direction in which the seat attachment 19 is separated from the steel plate 19 by the seat attachment drive motor 30 attached to the vehicle.

FIG. 32 is a block diagram of the electrical unit for this measurement. The electrical unit 25 includes an amplifier 25a
, An A / D conversion unit 25b, a control unit 26, a display unit 25c, a switch unit 21, a seat attachment driving unit 27, a contact detection unit 28, and a nut detection unit 2.
9 is provided. The seat attachment driving means 2
7 includes a motor (not shown) and the like.
Similarly to the transmission of the driving force between the rotary shaft 3 and the rotary shaft 3, the seat attachment 7 is rotated substantially in the same direction as the tension shaft 9 via the worm gear device in both the forward and reverse directions, that is, is rotated.

The contact detecting means 28 detects the contact between the seating attachment 7 and the steel plate 19, and this detection can be detected by the torque fluctuation of the motor of the seating attachment driving means 27. Alternatively, a voltage may be applied between the seat attachment 27 and the steel plate 19 so that a minute current flows due to conduction due to contact, and the detection may be performed. The nut detecting means 27 can detect whether or not the nut has entered a gap formed between the seating attachment and the tension shaft.

As shown in FIG. 33, the control means 26 includes a storage means 26a, a comparing means 26b, a counting means 26c, a reverse rotation time determining means 26d, a control signal generating means 26e, and a mode switching means 26f. And can be configured using a microcomputer. The storage unit 26a can store one or both of the set value of the tensile force and the measured value of the tensile force.

The comparison means 26b can compare the measured value measured by the measurement means 6c with the set value stored in the storage means 26a. Also, the comparison means 26b
Compares the measured value stored in the storage means 26a with the measured value subsequently measured by the measuring means 6c.

The counting means 26c is provided with the switch 21
The rotation time based on the number of rotations from turning on of the motor 20 to stopping the motor 20 can be counted. The reverse rotation time determination means 26d can determine the reverse rotation time of the motor 20 from the rotation time based on the number of rotations counted by the counting means 26c.

The control signal generating means 26e can send a measurement start signal to the strain gauge 6c and send a rotation drive signal to the motor 20. The mode switching means 26f is provided in a break value measurement mode (step S
7-9), intensity value measurement mode (steps S12-15 described later), and peak value measurement mode (modes S16-21 described later).
Can be switched.

FIG. 34 is a flowchart showing the control program. When the program is executed, in step S1, as shown in FIG. 36A, the seat attachment drive motor 30 is started, the seat attachment 7 is extended, and the process proceeds to step S2.

In step S2, as shown in FIG. 36B, when the seat attachment 7 comes into contact with the steel plate 19, the seat attachment drive motor 30 is stopped, and the flow advances to step S3.

In step S3, as shown in FIG. 36 (C), the motor 20 is started and is rotated at a low speed until a predetermined time in step S4 elapses. When the threaded portion 9b starts screwing into the nut 17, the process proceeds to step S5.

In step S5, the counting means 26c is operated, and the flow advances to step S6. In step S6, as shown in FIG. 36 (D), the rotation speed of the motor 20 is increased to rotate at high speed, and the process proceeds to step S7.

In step S7, the tensile force is measured based on an electric signal output from the strain gauge 6c and proportional to the tensile force of the screw member, and the flow advances to step S8. Step S8
Then, it is determined whether or not a break has occurred based on a sudden change in the electric signal output from the strain gauge 6c. If the break has occurred, the process proceeds to step S9, and if not, the process proceeds to step S12.

In step S9, the measured value is displayed on the display means 25c as a break value, and the flow advances to step S10. In step S10, the nut detection means 29 detects whether the nut 17 serving as a screw member is screwed into the back side between the seating attachment 7 and the tension shaft 9, and determines whether the screw 17 is screwed into the back side. If there is, the process proceeds to step S11, and if not, the process proceeds to step S22.

[0325] In step S11, the rotation of the seat attachment 7 in the feed-out direction and the rotation of the tension shaft 9 in reverse to the rotation of the seat attachment 7 are performed, and the flow advances to step S22. In step S12, the tensile force is measured based on an electric signal output from the strain gauge 6c and proportional to the tensile force of the screw member, and the process proceeds to step S13. Step S13
Then, the measured value of the pulling force is stored in the storage means, and step S
Proceed to 14.

At step S14, the measured value stored at step S13 is compared with the measured tensile force. If the measured value is larger, the process proceeds to step S15, and if not, the process proceeds to step S16. In step S15, the measured value is displayed on the display unit 25c as an intensity value, and the process proceeds to step S22.

In step S16, the tensile force is measured based on an electric signal output from the strain gauge 6c and proportional to the tensile force of the screw member, and the flow advances to step S17. In step S17, the measured value measured in step S16 is stored in the storage unit, and the process proceeds to step S18.

In step S18, the tensile force is measured based on an electric signal output from the strain gauge 6c and proportional to the tensile force of the screw member, and the flow advances to step S19.

In step S19, the stored value (measured value) stored in step S17 is compared with the measured value measured in step S18. If the measured value is larger, the process proceeds to step S20; To step S21
Proceed to. Is

At step S20, the measured value at step S16 stored in the storage means 26a is stored in step S18.
The measured value is updated and stored, and the process returns to step S18.
Measure the tensile force again.

In step S21, the stored value is displayed on the display means 25c as a peak value, and the flow advances to step S22.
In step S22, the motor 20 is temporarily stopped, and the process proceeds to step S23.

[0332] In step S23, the counting means 26c operated in step S5 is stopped, and the flow advances to step S24.

In the step S24, the counting means 26c
Motor 2 for a time corresponding to the number of revolutions counted by
0 is reversely rotated, and the process proceeds to step S25. Step S25
Then, the motor 20 is stopped.

According to the tensile strength tester shown in FIG. 31, the screw member 1 is attached to the steel plate 19 to which the screw member 17 is attached.
7 is applied to the steel plate 19 by a tensile strength tester 1A or 1B which measures the pull-out strength from the pulling force by applying a pulling force in the pulling-out direction to the screw member 17 via a motor 20 for driving the pulling shaft 9. Touching seating attachments 7, 47
Attachment driving means 30 for driving the seat in the approaching / separating direction
Detecting means 28 for driving the seating attachments 7 and 47 by the seating attachment driving means 30 to detect contact with the steel plate 19; and control means 26 for driving the tension shaft 9 based on the detection result of the detecting means 28. By driving the tension shaft 9 by detecting that the seating attachments 7, 47 are in contact with the steel plate 19, the tension shaft 9 can be stably screwed to the screw member 17. .

Further, according to the tensile strength tester, since the detecting means 28 detects by the torque fluctuation of the seat attachment drive motor 30, the seat attachments 7, 4 are detected by the torque fluctuation of the seat attachment drive motor 30.
The tension shaft 9 can be stably screwed to the screw member 17 by detecting that the 7 has contacted the steel plate 19.

Further, according to the tensile strength tester, since the detecting means 28 detects by the torque fluctuation of the seat attachment driving motor 30, the seat attachments 7, 4 are detected by the torque fluctuation of the seat attachment driving motor 30.
The tension shaft 9 can be stably screwed to the screw member 17 by detecting that the 7 has contacted the steel plate 19.

In the above description, when the tension shaft 9 comes off the screw member 17, the idle rotation occurs. Therefore, the second detection means for detecting that the screw member has been removed from the base material is provided, and the torque of the motor 20 is reduced. May be detected, and the drive control means may stop the drive means based on the detection result of the second detection means.

The present invention is not limited to the above embodiment. That is, various modifications can be made without departing from the gist of the present invention.

[0339]

As described above, according to the present invention, the drive means is controlled so as to stop when a breakage value is detected. In this case, by stopping the driving unit, unnecessary driving of the driving unit can be prevented. In the case where a display is provided, the breaking value can be displayed. In the case where the removing means is provided, the screw member detached from the base material can be removed from the pulling means. When the display unit is provided, the break value determined by the determination unit can be visually or audibly recognized. Further, when the inner surface shape of the seat attachment is substantially the same as the outer surface shape of the screw member, the position where the seat attachment comes into contact with the base material can be arranged close to the screw member, and the base material of the base material can be arranged. Deformation such as bending can be prevented. Further, when the screw shape of the seating attachment and the outer cylindrical portion is formed in a reverse thread to the screw shape of the tip of the pulling portion, when the pulling portion is removed from the screw member, the seating attachment and the outer cylindrical portion are not screwed. Will not come off.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a tensile strength tester according to a first embodiment of the present invention.

FIG. 2 is a block diagram of an electrical component.

FIG. 3 is a perspective view of a tensile strength tester according to a second embodiment cut along a plane including an axis.

4A and 4B are diagrams showing a tensile strength tester according to a third embodiment, wherein FIG. 4A is a perspective view cut along a plane including a shaft, FIG. 4B is an enlarged perspective view of a main part, and FIG. It is a perspective view.

FIG. 5 is a view showing a fourth embodiment, in which (A) is a perspective view cut along a plane including a shaft, and (B) is an enlarged perspective view of a tension shaft.

FIG. 6 is a perspective view of a tensile strength tester of a fifth embodiment cut along a plane including an axis.

FIG. 7 is a front sectional view showing a tensile strength tester according to a sixth embodiment.

FIG. 8 is a perspective view of a tensile strength tester according to a sixth embodiment, cut along a plane including a shaft with a ratchet handle removed.

FIG. 9 is a perspective view of a tensile strength tester of a sixth embodiment cut along a plane including a shaft with a ratchet handle mounted.

FIG. 10 is a perspective view of a tensile strength tester according to a seventh embodiment cut along a plane including an axis.

FIG. 11 is a front sectional view showing a tensile strength tester according to an eighth embodiment of the present invention.

FIG. 12 is a side view common to the tensile strength tester of FIG. 11 and the tensile strength tester of FIG. 27;

FIG. 13 is a block diagram of an electrical component of the tensile strength tester of the present invention.

FIG. 14 is a block diagram showing a control unit of the tensile strength tester of the present invention.

FIG. 15 is a flowchart showing a control operation of the tensile strength tester of the present invention.

FIG. 16 is a schematic plan view of a tensile strength tester of the present invention, wherein (A) shows a tensile strength tester of an eighth embodiment,
(B) shows the tensile strength tester of the ninth embodiment.

17A and 17B are schematic diagrams showing a driving force transmitting portion of the tensile strength tester of the present invention, wherein FIG. 17A is a schematic plan view when the bevel gear of the tenth embodiment is used, and FIG. ,
(C) is a schematic plan view at the time of using the universal joint of 11th Embodiment.

FIG. 18 is a front sectional view of a tensile strength tester to which the present invention is applied.

19 is a top view common to the tensile strength tester of FIG. 18 and the tensile strength tester of FIG. 38.

FIG. 20 is a perspective view of the handle, in which (a) shows a state before the handle member is protruded, and (b) shows a state after the handle member is protruded.

FIG. 21 is a perspective view showing another mode of the handle.

FIG. 22 is a graph showing a relationship between a tensile force applied to a screw member and a rotation angle of the handle.

FIG. 23 is a front sectional view showing a modified example of the load converter.

FIG. 24 is a sectional view showing another mode of the conduction shaft.

FIG. 25 is a cross-sectional view showing another example of the object to be measured and the tensile shaft in another embodiment.

FIG. 26 is a flowchart showing a control operation of the tensile strength tester of the present invention.

FIG. 27 is a front sectional view showing a tensile strength tester according to a twelfth embodiment of the present invention.

FIG. 28 is a front sectional view showing a tensile strength tester according to a thirteenth embodiment.

FIG. 29 is a front sectional view showing a tensile strength tester according to a fourteenth embodiment.

30A and 30B are views showing a seat attachment and a member to which the seat attachment is screwed, wherein FIG. 30A is a perspective view of a member to which the seat attachment is screwed, FIG. 30B is a perspective view of the seat attachment, and FIG. FIG. 13D is a cross-sectional view of a modification of the attachment, and FIG. 14D is a cross-sectional view of another modification of the seating attachment.

FIG. 31 is a front sectional view showing a tensile strength tester according to a fifteenth embodiment of the present invention.

FIG. 32 is a block diagram of an electrical unit of the tensile strength tester of the present invention.

FIG. 33 is a block diagram showing a control unit of the tensile strength tester of the present invention.

FIG. 34 is a flowchart showing a control operation of the tensile strength tester of the present invention.

FIG. 35 is a front sectional view showing a tensile strength tester according to a sixteenth embodiment.

FIG. 36 is a cross-sectional view of a main part showing a threaded engagement of a tension shaft;
(A) shows the start of the seat attachment drive motor, (B) shows the contact between the seat attachment and the base material, (C) shows the start of the screwing of the tension shaft and the nut,
(D) is a diagram showing a state in which the rotational speed of the motor is increased to measure the tensile force.

FIG. 37 is a view showing a conventional pull-out strength tester.

FIG. 38 is a front sectional view showing another embodiment relating to motor driving.

FIG. 39 is a front sectional view showing another embodiment related to motor driving.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tensile strength tester 2 Handle part 2B 2nd handle part 3 Rotation shaft (rotation member, rotation means) 3b Worm gear (drive force transmission means) 4 Bearing 5a Body part (outer cylinder part, outer cylinder means) 6c Strain gauge (measuring means) 7c Seating part 8 Drive plate with hexagonal hole (connection means, second connection part) 9 Tension shaft (tension member, tension means) 9a Hex head (first connection part) 9b Shaft part Reference Signs List 14 drive shaft of drive means 14a worm (drive force transmission means, drive means) 17 screw member 19 steel plate (base material) 20 motor (drive means) 21 on / off switch 23b bevel gear (drive force transmission means) 25c display means 26 control Means 26a Storage means 26b Comparison means 26c Counting means 26d Reverse rotation time determining means 26e Control signal generating means 34a Bevel gear (driving force transmitting means) G Center of gravity K Rotation of rotating member Heart U universal joint

Claims (10)

[Claims] 1. A tensile strength tester for applying a tensile force to a base material to which a screw member is attached in a direction in which the screw member is pulled out from the base material, and measuring the tensile force. Contact means, a driving means for rotating the contact means, a tension means for screwing the screw member of the base material to pull the screw member, and measuring a tensile force generated by the tension means. A measuring unit for storing a predetermined value; a comparing unit for comparing a measured value measured by the measuring unit with a set value stored in the storing unit; Detecting means for detecting a breaking value indicating that the material has been removed from the base material; and a driving control means for stopping the driving means based on a detection result of the detecting means. Tester. 2. The tensile strength tester according to claim 1, further comprising display means for displaying the breaking value. 3. The tensile strength tester according to claim 1, further comprising removing means for removing the screw member detached from the base material screwed to the pulling means from the pulling means. 4. A tensile strength tester for applying a tensile force to a base material to which a screw member is attached in a direction in which the screw member is pulled out from the base material, and measuring the tensile force. , A driving unit, and 1) the measuring unit includes a tension portion having a threaded portion formed at a distal end thereof, and a tension portion which is engaged with a base end of the tension portion and rotates the tension portion. A rotating portion that is screwed into the screw member, a fixed portion that rotatably holds the pulling portion and abuts against the base material, and a screw member that is screwed into the pulling portion. 2) the arithmetic unit includes a storage unit for storing a measurement value measured by the measurement unit as needed, and a breaking value at which the measurement value becomes substantially zero. A determination unit for determining whether or not there is, 3) the above Moving unit includes a driving unit, a drive transmitting part for transmitting the driving force generated by the driving unit to the rotating unit,
A drive control unit that stops driving the drive unit when the determination unit determines that the measured value is the break value. 5. The tensile strength tester according to claim 4, further comprising a display unit for visually or audibly recognizing the fracture value determined by the determination unit. 6. The fixing portion has an outer cylinder portion and a seating attachment that comes into contact with a base material, the seating attachment and the outer cylinder portion are screwed together, and the seating attachment is attached to the outer cylinder portion. The tensile strength test according to claim 4, wherein the inner surface of the seat attachment is substantially the same as the outer surface of the screw member. vessel. 7. The tensile strength test according to claim 6, wherein a screw shape of the seat attachment and the outer cylindrical portion is formed in a reverse thread to a screw shape of a tip of the tension portion. vessel. 8. The tensile strength tester according to claim 4, wherein the rotating portion and the tension portion are connected by screwing each other. 9. The rotating part has a hollow body and a rotating connecting part connected to the pulling part, the pulling part has a pulling connecting part on a base end side, and the turning part The connecting portion is disposed below the trunk along the axis of the pulling portion, and is configured to insert the pulling portion through the trunk to connect the rotating connection portion and the pulling connecting portion. The tensile strength tester according to claim 4, wherein: 10. A measuring device comprising: a strain gauge for measuring a deformation in a thrust direction; a thin portion to which the strain gauge is attached; The tensile strength tester according to claim 4, further comprising a fixing portion fixed to the outer cylinder member.