JPH1137869A - Method for measuring fastening torque of bolt or the like and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately and uniformly measure the torque of a fastened bolt by storing the position of an automatically fastened bolt without adding a counter mark to the fastened bolt, returning the bolt, and re-fastening it until the first position. SOLUTION: A socket 21 engaged with a bolt or the like with a torque weak enough for preventing the fastened bolt from being rotated to a fastening direction is rotated by a servo motor 6, and an angular position at which this is stopped is detected and stored as a mark position. Then, the socket 21 is returned in a prescribed amounts, and the bolt or the like is loosened. Then, the socket 21 is rotated until the detected mark position by the servo motor 6, and the bolt or the like is re-fastened. Thus, a torque at the time of re- fastening can be measured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring a tightening torque of a bolt or the like for measuring a tightening torque of a bolt for fixing a rail of a railway to a concrete sleeper and a measuring apparatus of a tightening torque of a bolt or the like.

[0002]

2. Description of the Related Art Conventionally, when measuring the tightening torque of a bolt that has been tightened, a mark is manually attached to the bolt and the object to be tightened, and the bolt is loosened. Is retightened to the point where the matching mark is matched, the torque at that time is read, and this is used as the bolt tightening torque.

[0003]

The measurement of the tightening torque of a bolt tightened in a conventional manner has the following disadvantages. (1) A matching mark must be provided for each bolt to be measured, which is troublesome and troublesome. (2) The bolt re-tightening operation must be performed manually using a torque wrench, and the matching mark must be accurately adjusted. This operation is difficult, and it is difficult to measure accurately. (3) Since the bolt re-tightening operation is a manual operation using a torque wrench, it is difficult to perform the tightening operation such that the bolts are aligned with the matching mark at the same angular velocity for each measurement, and it is difficult to measure an accurate and uniform tightening torque. . (4) For bolts with a large pitch, such as fastening bolts for concrete sleepers on railway rails,
Due to the drawback (3), it is difficult to reduce the variation in the measured torque value.

The present invention has been made in view of the above-mentioned conventional drawbacks,
Automatically memorizes the tightened bolt position without putting a matching mark on the tightened bolt, and tightens or re-tightens to the initial position after returning it at the specified angular speed, and the torque of the tightened bolt It is an object of the present invention to provide a method of measuring a tightening torque of a bolt and the like and a measuring device of a tightening torque of a bolt and the like, which can measure the torque accurately and uniformly.

The foregoing and other objects and novel features of the invention will become more fully apparent when the following description is read in conjunction with the accompanying drawings. However, the drawings are for explanation only, and do not limit the technical scope of the present invention.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a servo motor, wherein a socket engaged with a bolt or the like is weakly torqued so that the bolt or the like does not rotate in the tightening direction. A mark position detecting step of detecting and storing the angular position at which rotation and stop are performed as a mark position, and a loosening step of a bolt or the like for returning the socket by a predetermined amount by a servomotor to loosen the bolt after the mark position detecting step; After the loosening step, the socket is rotated by a servomotor to the mark position detected in the mark position detecting step, the bolts and the like are re-tightened, and the tightening torque of the bolts and the like are measured in the tightening torque measuring step of measuring the torque at the time of re-tightening. The measurement method is configured.

Further, the present invention provides a cylindrical case body having a handle, a torque sensor installed substantially at the center of the case body, and an input shaft of the torque sensor attached to an upper end of the case body. A servomotor to which a drive shaft is connected via a speed reducer, an output having a socket protruding outward from a lower end portion of the case body connected to an output shaft of the torque sensor and being engaged with a bolt or the like at a tip end portion; A tightening torque measuring device main body comprising a shaft, a rotary encoder attached to a lower end portion of the case body for detecting a rotational angular position of the output shaft, and a bolt to be inspected being tightened are rotated in the tightening direction. The socket engaged with the bolt or the like is rotated by the servo motor with a weak torque that does not move, and the stopped angular position is marked by the rotary encoder. After detecting and storing the position as a mark, after detecting the mark position, the servo motor returns the socket by a predetermined amount to loosen bolts and the like, and thereafter, the servo motor is rotated to the mark position to rotate the bolt and the like. A torque measurement control device for retightening and measuring the torque at the time of retightening constitutes a device for measuring a tightening torque of a bolt or the like.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings.

In the first embodiment of the present invention shown in FIGS. 1 to 9, reference numeral 1 denotes a cylindrical case body formed with handles 3, 3 having start switches 2 projecting left and right outward. The case body 1 includes an upper case 4 on which the handles 3 are formed, and a lower case 5 fitted and fixed to a lower end of the upper case 4.

Reference numeral 6 denotes a motor plate 8 fixed to the upper end of the upper case 4 of the case body 1 by a plurality of bolts 7 so that the drive shaft 10 is positioned in the upper case 4 by a plurality of bolts 9. With the attached servo motor, the servo motor 6 can be set so that a bolt or the like to be tightened or loosened can be driven at a predetermined angular velocity, and can be rotated at a large angular velocity at the beginning and at a small angular velocity at the end. Things.

Reference numeral 11 denotes a torque sensor which is installed substantially in the center of the case body 1 and which is installed so that an input shaft 12 and an output shaft 13 protrude in upper and lower portions of the case body 1.

Numeral 14 denotes bearings 15, 1 in the upper case 4.
One end attached via the first and second motors 6 and 17 is connected to the drive shaft 10 of the servo motor 6, and the other end is connected to the torque sensor 1.
This is a speed reducer connected to one input shaft 12.

Reference numeral 18 denotes bearings 19, 2 in the lower case 5.
0, one end rotatably mounted is connected to the output shaft 13 of the torque sensor 11, the other end protrudes outward from the lower end of the lower case 5, and a socket engaged with a bolt or the like at the end. An output shaft 21 is detachably attached with bolts 22.

A rotary encoder 23 is attached to the lower end of the lower case 5 so as to cover the outer peripheral portion of the output shaft 18 and detects the angular position at which the output shaft 18 rotates.

Reference numeral 24 denotes a tightening torque measuring device composed of the above-described components. Measurement of tightening torque of bolts and the like connected to the servomotor 6, the torque sensor 11, and the rotary encoder 23 of the main body 25 of the tightening torque. The torque measurement control device is capable of selectively performing operations such as tightening a bolt or the like tightened to a preset tightening torque to a set torque after the measurement of the predetermined torque or loosening the tightened bolt or the like. 24 is a numerical input keyboard 26,
A liquid crystal display 27 for displaying numerical values input or measured by the numerical input keyboard 26, a printer 28 for writing measured values and the like, and the torque sensor 11 and the rotary encoder under the conditions input by the numerical input keyboard 26. 23, a sequencer 29 for driving the servo motor 6 using the numerical controller 23. When measuring the tightening torque of a bolt or the like, input the torque measurement with the numerical input keyboard 26, hold the handles 3, 3 with both hands, 21 is engaged with a bolt 30 or the like to be measured.

At this time, if the tightening bolt has a small torque, the handles 3, 3 held by both hands are supported so as not to rotate, and if the tightening bolt has a large torque, as shown in FIG. This is performed using a support tool 31 that supports the handles 3 and 3 so as not to rotate.

When the socket 21 is engaged with the bolt 30 or the like, the start switch 2 of the handle 3 is turned on, so that the bolt 30 or the like is weakly rotated so as not to rotate in the tightening direction as shown in FIG. The socket 21 engaged with the socket 21 is rotated to perform a mark position detecting step 32 of detecting and storing the stopped angular position as a mark position. Thereafter, the socket 21 is returned by a predetermined amount, for example, a predetermined angle, or a predetermined angle is returned. Return to torque value and bolt 3
Performing a bolt loosening step 33 for loosening 0, etc., then rotating the socket 21 to the mark position detected in the mark position detecting step 32, re-tightening the bolt 30 and the like, and reducing the torque at the time of re-tightening. The torque measurement control device 24 operates so as to automatically perform a torque measurement step 34 of measuring and displaying on the liquid crystal display 27 and recording on the printer 28.

When the bending does not occur from the rotary encoder 23 to the socket 21, the torsion correction is unnecessary. However, when the bending occurs, the rotary encoder 23 is related to the torque value detected from the torque sensor 11.
The additional rotation of the bending angle from the mounting position to the socket 21 is performed, and the torque at the time of retightening is measured.

Further, by setting the angular velocity of rotation of the servo motor 6 to a constant value when tightening the bolt 30 or the like, more accurate and uniform torque measurement can be performed.

After measuring the tightening torque of bolts and the like,
When tightening a bolt or the like with a preset torque, as shown in FIG. 7, the tightening torque of the bolt or the like and a predetermined angular velocity are set by the numerical value input keyboard 26, the torque measurement tightening is input, and the handles 3, 3 are held with both hands. And the socket 21 is engaged with the bolt 30 or the like to be measured,
By turning on the start switch 2 as described above, the torque is measured through the same steps as described above. In addition,
When inputting the torque measurement tightening, the work can be efficiently performed by setting the tightening at a large angular velocity at the beginning and the tightening at the low angular velocity at the end.

After the torque is measured, a bolt loosening step 33 is performed, and the torque measuring control is performed so that a bolt tightening step 35 for tightening the bolt 30 or the like is automatically performed so as to have a preset tightening torque. The device 24 operates.

When the bolts 30 and the like are tightened so as to have a preset tightening torque, the tightening torque of the bolts and the like is set by the numerical input keyboard 26,
The bolts or the like are inputted, the handles 3 and 3 are held with both hands, and the socket 21 is engaged with the bolts 30 or the like for tightening the socket 21. As shown in FIG. The tokule measurement control device 24 operates in such a manner as to perform the measurement in a suitable manner. When the bolts or the like are tightened so as to have a preset tightening torque, the bolts or the like may be tightened only in the bolting step 35.

When loosening the tightened bolts or the like, the user inputs the loosening of the bolts or the like with the numerical value input keyboard 26, and
Holding the handles 3, 3 with both hands, engaging the bolts 30 or the like for loosening the socket 21 and automatically performing the bolt loosening step 33 as shown in FIG. The device 24 is a measuring device 36 for measuring a tightening torque of a bolt or the like on which the device 24 operates.

[0024]

FIG. 10 to FIG.
Hereinafter, different embodiments of the present invention will be described. In the description of the different embodiments of the present invention, the same components as those of the first embodiment of the present invention are denoted by the same reference numerals, and duplicate description will be omitted.

The second embodiment of the present invention shown in FIGS. 10 to 12 is different from the first embodiment of the present invention mainly in the case 1 or the handles 3, 3,.
The embodiment of the present invention is characterized in that arm-shaped supports 37, 37 for preventing the rotation of the handles 3, 3 are rotatably attached to the handles 3, 3, such as a bolt or the like configured in this manner. Even with the tightening torque measuring device 36A, the same operation and effect as those of the first embodiment of the present invention can be obtained.

The third embodiment of the present invention shown in FIGS. 13 to 15 is mainly different from the first embodiment of the present invention in that it travels on rails 38, 38 of a railway. The case body 1 is placed on a slidable support base 40 that can be fixed to an arbitrary position in the width direction on a trolley 39 that can be slid, and a vertically movable base 41 that can be vertically moved and fixed on the support base 40 at an arbitrary position in the height direction. At the fixed point, the tightening torque measuring device 36B for bolts and the like configured as described above may be used.

The fourth embodiment of the present invention shown in FIGS. 16 to 18 is different from the first embodiment of the present invention mainly in that a tripod-like support base 42 is provided so as to be vertically movable. At the point where the body 1 is attached, the measuring device 36 </ b> C for measuring the tightening torque of the bolt or the like configured as described above may be used.

[0028]

As apparent from the above description, the following effects can be obtained in the present invention.

(1) The socket engaged with the bolt or the like is rotated by a servomotor with a weak torque such that the bolt or the like being tightened does not rotate in the tightening direction, and the angular position at which the socket is stopped is detected as a mark position. A mark position detecting step to be stored, a step of loosening a bolt or the like after returning the socket by a predetermined amount by a servomotor after the mark position detecting step, and a step of arranging the mark position detected in the mark position detecting step after the loosening step. The socket is rotated by a servo motor to re-tighten the bolts and the like, and a tightening torque measuring step of measuring the torque at the time of re-tightening. Can be measured.

(2) According to the above (1), since the socket engaged with the bolt to be measured is rotated by the servomotor, even one person can easily and accurately measure the tightening torque of the bolt and the like.

(3) According to the above (1), the detection of the mark position, the return of the predetermined amount, and the retightening up to the mark position can be automatically performed, so that the bolt to be measured can be measured almost uniformly. it can. Therefore, the measurement accuracy can be improved.

(4) According to the above (1), since a servomotor is used, it is possible to perform more accurate and uniform torque measurement by setting the tightening of bolts and the like at a predetermined angular velocity. it can.

(5) Claims 2, 3 and 4 also have the above (1) to (4).
The same effect as (4) can be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a first embodiment of the present invention.

FIG. 2 is a partially cutaway front view of the main body of the measuring device for the tightening torque;

FIG. 3 is a partially cutaway plan view of a main body of the measuring device for the tightening torque;

FIG. 4 is a partially cutaway bottom view of the main body of the measuring device for the tightening torque;

FIG. 5 is an explanatory diagram of a use state according to the first embodiment of the present invention.

FIG. 6 is a process chart of a method for measuring a tightening torque of a bolt or the like.

FIG. 7 is a process diagram in the case of tightening with a set torque after torque measurement.

FIG. 8 is a process chart in the case of tightening with a set torque.

FIG. 9 is a process diagram in the case of loosening a tightened bolt.

FIG. 10 is an explanatory diagram of a second embodiment of the present invention.

FIG. 11 is a partially cutaway front view of the main body of the measuring device for the tightening torque;

FIG. 12 is a side view of the use state of the second embodiment of the present invention.

FIG. 13 is an explanatory diagram of a third embodiment of the present invention.

FIG. 14 is a front view of the use state of the third embodiment of the present invention.

FIG. 15 is a front view of the use state of the third embodiment of the present invention.

FIG. 16 is an explanatory diagram of the fourth embodiment of the present invention.

FIG. 17 is a partially cutaway front view of the main body of the measuring device for the tightening torque;

FIG. 18 is a bottom view of the main body of the measuring device for the tightening torque;

[Explanation of symbols]

1: Case body, 2: Start switch, 3: Handle, 4: Upper case, 5: Lower case, 6: Servo motor, 7: Bolt, 8: Motor plate, 9: Bolt 10: Drive shaft, 11: Torque sensor , 12: input shaft, 13: output shaft, 14: reduction gear, 15: bearing, 16: bearing, 17: bearing, 18: output shaft, 19: bearing, 20: bearing, 21: socket, 22: bolt, 23 : Rotary encoder, 24: Torque measurement control device, 25: Tightening torque measurement device main body, 26: Numeric input keyboard, 27: Liquid crystal display, 28: Printer, 29: Sequencer, 30: Bolt to be measured, 31: Support , 32: mark position detection step, 33: bolt and other loosening step, 34: torque measurement step, 35: bolt and other tightening step, 36, 36A 36B, 36C: apparatus for measuring the tightening torque of bolts, 37: arm-shaped support, 38: railway rail, 39: carriage, 40: support base, 41: vertical moving base, 42: support base.

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[Procedure amendment]

[Submission date] August 22, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

Claims (5)

[Claims] An angle position at which a socket engaged with a bolt or the like is rotated by a servomotor with a weak torque so that the bolt or the like being tightened does not rotate in a tightening direction is stopped and detected as a mark position and stored. A mark position detecting step to be performed, a step of loosening a bolt or the like after returning the socket by a predetermined amount by a servomotor after the mark position detecting step, and a step of loosening the bolt or the like to the mark position detected in the mark position detecting step after the loosening step. A method of measuring a tightening torque of a bolt or the like, comprising: rotating a socket with a servo motor to re-tighten a bolt or the like, and measuring a torque at the time of the re-tightening. 2. An angular position at which a socket engaged with a bolt or the like is rotated by a servomotor with a weak torque so that the bolt or the like being tightened does not rotate in the tightening direction is stopped and detected as a mark position and stored. A mark position detecting step to be performed, a step of loosening a bolt or the like after returning the socket by a predetermined amount with a servomotor after the mark position detecting step, and a step of loosening the bolt or the like to the mark position detected in the mark position detecting step after the loosening and fixing. A torque measuring step of rotating the socket, retightening the bolts and the like, measuring the torque at the time of the retightening, and automatically recording a measured value in a printer, and measuring the tightening torque of the bolts and the like. . 3. A cylindrical case body formed with a handle,
A torque sensor installed substantially at the center of the case body, a servomotor connected to an input shaft of the torque sensor attached to the upper end of the case body and a drive shaft via a speed reducer, and an output of the torque sensor An output shaft that protrudes outward from a lower end of the case body connected to a shaft and has a socket that is engaged with a bolt or the like at a tip end thereof, and that the output shaft attached to the lower end of the case body rotates. A tightening torque measuring device main body comprising a rotary encoder for detecting an angular position, and the socket engaged with the bolts or the like with a weak torque such that a tightened inspection bolt or the like does not rotate in the tightening direction. It is rotated by a servomotor, and the angular position at which it is stopped is detected and stored as a mark position by the rotary encoder. Return the socket by a predetermined amount with a servo motor to loosen the bolts and the like, and then rotate the servo motor to the mark position to re-tighten the bolts and the like, and measure the torque at the time of the re-tightening. A measuring device for a tightening torque of a bolt or the like, comprising a control device. 4. A cylindrical case body formed with a handle,
A torque sensor installed substantially at the center of the case body, a servomotor connected to an input shaft of the torque sensor attached to the upper end of the case body and a drive shaft via a speed reducer, and an output of the torque sensor An output shaft that protrudes outward from a lower end of the case body connected to a shaft and has a socket that is engaged with a bolt or the like at a tip end thereof, and that the output shaft attached to the lower end of the case body rotates. A tightening torque measuring device main body comprising a rotary encoder for detecting an angular position, and the socket engaged with the bolts or the like with a weak torque such that a tightened inspection bolt or the like does not rotate in the tightening direction. It is rotated by a servomotor, and the angular position at which it is stopped is detected and stored as a mark position by the rotary encoder. Return the socket by a predetermined amount with a servo motor to loosen the bolts and the like, and then rotate the servo motor to the socket to the mark position and re-tighten the bolts and the like, and measure the torque at the time of re-tightening, An apparatus for measuring a tightening torque of a bolt or the like, comprising a torque measurement control apparatus for recording a measured value by a printer. 5. A cylindrical case body formed with a handle,
A torque sensor installed substantially at the center of the case body, a servomotor connected to an input shaft of the torque sensor attached to the upper end of the case body and a drive shaft via a speed reducer, and an output of the torque sensor An output shaft that protrudes outward from a lower end of the case body connected to a shaft and has a socket that is engaged with a bolt or the like at a tip end thereof, and that the output shaft attached to the lower end of the case body rotates. A tightening torque measuring device main body comprising a rotary encoder for detecting an angular position, and the socket engaged with the bolts or the like with a weak torque such that a tightened inspection bolt or the like does not rotate in the tightening direction. It is rotated by a servomotor, and the angular position at which it is stopped is detected and stored as a mark position by the rotary encoder. Return the socket by a predetermined amount with a servo motor to loosen the bolts and the like, and then rotate the servo motor to the socket to the mark position and re-tighten the bolts and the like, and measure the torque at the time of re-tightening, And a torque measurement control device that operates the servomotor so that the torque becomes a preset torque after recording the measured value with a printer.