JP2860636B2 - Mark detection mechanism in tensile test - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tension test for detecting displacement of a mark line marked on a test piece when a tensile test is performed on a material having large elongation such as plastic or rubber in a thermostat. It relates to a line detection mechanism.

[0002]

2. Description of the Related Art Conventionally, in a tensile test of a flexible material such as plastic or rubber, a mark line marked on a test piece is deformed when being pulled. Means for accurately detecting the position of the line has been required. Therefore, for example, Japanese Utility Model Publication No. 4-21090 proposes an optical non-contact type marker detection device, and Japanese Utility Model Publication No. 6-18269 proposes an electric contact type inter-marker displacement measuring apparatus.

[0003] In addition to the above, a contact type marker detection device shown in FIG. 6 has been known. In this conventional apparatus, a vertical guide rod 34 is inserted through an upper clip portion 32 and a lower clip portion 33 that hold a test piece 31, and the upper clip portion 32 is connected to a balancer via a single wire 36. The wire 36 is hooked on pulleys 38 provided on an upper surface plate 45 of the mark detection device. Thus, the upper clip portion 32 and the balancer 35 are vertically supported by the pulleys 38 and 38 so as to be vertically movable. Similarly, the lower clip portion 33 and the balancer 37 are supported by pulleys 39 and 39 and one wire 44 so as to be vertically movable up and down.

[0004] Both ends of the test piece 31 are gripped by the knobs 41, 41 of the tensile tester.
Reference numerals 1 and 41 are connected to the upper and lower crossheads of the tensile tester. Therefore, the tip of the upper clip portion 32 sandwiches the upper side of the test piece 31. Similarly, the distal end of the lower clip portion 33 holds the lower side of the test piece 31. In the figure, reference numeral 40 denotes a thermostat. Here, a substantial portion of the vertical guide rod 34, the upper clip portion 32, the lower clip portion 33, and the test piece 31 are arranged in a thermostat 40.

At the time of a tensile test, the knobs 41, 41
Since the test piece 31 is moved in the extending direction, the test piece 31 is extended and the position of the mark is displaced. The amount of this displacement is
8 and a rotation detector 43 directly connected to the pulley 39.

[0006]

Conventionally, in an optical non-contact type mark tracing device, when a tensile test is performed at a low temperature, when a test piece is replaced, a mark marked on the test piece by opening and closing a test tank door. There is a problem in that frost adheres to the viewing window for detecting the mark, which hinders the system for optically detecting the displacement of the marked line. In addition, this device has a problem that the mark detection mechanism and the measurement control system are more expensive than those of the contact signal mark tracking device of the electric signal type.

Further, in the contact-type mark-tracking device, since the detection mechanism penetrates from the inside of the thermostat to the outside of the thermostat, the amount of heat flowing in and out through the detection mechanism increases. And the temperature control system (heater capacity, refrigerator capacity). In addition, there is a problem in that a notch is provided in the thermostat so that the operation of the detection mechanism is not hindered, and a modification for minimizing the amount of heat flowing in and out of the notch is required. Was. In this contact type, the detection mechanism and measurement control system can be configured more economically than a non-contact type mark tracking device. There was a problem that it could not be configured.

The contact-type mark detection device shown in FIG. 6 has a great advantage that it can be economically constructed because of its simple structure. However, since a substantial part of the vertical guide rod and a pair of upper and lower clips into which the vertical guide rod has been inserted are integrally disposed in the constant temperature bath, during a test at a high temperature, the vertical guide rod may be thermally deformed. In addition, at the time of the test at a low temperature, there is a problem that the frost adhering to the vertical guide bar hinders the up-and-down movement of the clip portion, so that the displacement of the marking line cannot be accurately detected.

The present invention has been made to solve the above problems,
In addition to minimizing the remodeling of the thermostat, minimizing the air flow between the inside and the outside of the thermostat and economically providing a gauge detection mechanism in the tensile test that accurately detects the displacement of the gauge marked on the test piece. The purpose is to provide.

[0010]

According to the present invention, there is provided a mark detection mechanism in a tensile test, comprising: an upper clip arm and a lower clip arm for holding a test piece in a thermostat; The balance weights corresponding to the respective clip arms and the corresponding balance weights are provided so as to be able to move up and down outside the constant temperature bath, and the upper clip arm and the corresponding balance weights are connected by parallel wires spaced apart, with a rotating portion interposed therebetween, The upper clip arm can be lifted up and down and supported stably in an equilibrium manner. Similarly, the lower clip arm and the corresponding balance weight are connected by parallel wires spaced apart, and the lower clip is It is characterized in that the arm is supported vertically and stably and equilibrium.

[0011] Another rotating portion is provided with a pair of guide pulleys at a position opposite to the rotating portion, and the wire is interposed between the upper clip arm and the balance weight by interposing the other rotating portion. It is stretched in parallel at an interval, and another rotating part is also interposed between the lower clip arm and the balance weight, and the wire is stretched in parallel at an interval, and the clip arm and the balance weight are Are connected in a loop.

[0012]

Since the pair of upper and lower clip arms for holding the test piece are lifted up and down and supported in a stable manner in an equilibrium manner, the pair of upper and lower clip arms can be accurately tested. It moves up and down following the displacement of the marked line marked on one side.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG.
This will be described with reference to FIGS. First, a pair of upper clip arms 1 and lower clip arms 2 for holding a test piece S are provided in a thermostat R. On the other hand, a rectangular thick plate-shaped front balance weight 17 is provided on a vertically guided front guide rod 8 on a frame body 3 arranged outside the thermostatic chamber R, and a rectangular thick plate is similarly mounted on a rear guide rod 9. A rear balance weight 18 is provided so as to be vertically movable.

The frame 3 is composed of a horizontal rectangular upper surface plate 6 and a lower surface plate 7, and vertical columns 4, 4 and columns 5, 5 fixed to four corners of the upper and lower plates 6, 7, respectively. It is formed in a slightly high rectangular shape. The front guide rod 8 is provided upright from the center between the columns 4 forming the front frame of the frame and slightly inward from the center, and is provided across the upper plate 6 and the lower plate 7. It is. Posts 5, 5 also forming a rear frame
A rear guide bar 9 is provided upright at a position slightly inward from the center between the rear guide bars. The front balance weight 17
Has formed a guide hole that passes vertically through its center,
The front guide rod 8 is loosely inserted into this guide hole. Similarly, the rear guide bar 9 is loosely inserted into a guide hole formed in the rear balance weight 18. Note that, on the upper surface plate 6, a front rotation unit 10 and a rear rotation unit 11, which will be described later, are provided as a pair.

The upper clip arm 1 and the lower clip arm 2 are both formed in a long rectangular shape. The upper clip arm 1 has a slightly longer base end 1A.
And a slightly shorter distal end portion 1B are integrally formed. Similarly, the lower clip arm 2 is formed by integrating a base end portion 2A and a distal end portion 2B. The tip 1B holds the upper side of the test piece S vertically positioned in the figure, and the tip 2B
Hold the lower side of the test piece S. The upper clip arm 1 and the lower clip arm 2 have base ends 1A, 2A, respectively.
Supported by

The distal ends of two parallel wires 19 are separately fixed at two places spaced apart along the longitudinal direction of the upper surface of the base end 1A of the upper clip arm 1. The other ends of the two wires 19 are separately fixed to the upper surface of the front balance weight 17 at two places spaced apart from each other along the longitudinal direction with the guide hole as a center. As a result, the upper clip arm 1 and the front balance weight 17 are connected to each other by the two parallel wires 19 spaced from each other with the front rotating portion 10 interposed therebetween. The base end 1A has a small hole 2 for loosely inserting another wire 20.
1 are formed at two places with an interval.

The distal ends of the two wires 20 are separately fixed to two locations spaced apart along the longitudinal direction of the upper surface of the base end 2A of the lower clip arm 2. The other end of the wire 20 is separately fixed to two places spaced apart along the longitudinal direction of the guide hole on the upper surface of the rear balance weight 18 with the guide hole as a center. Thereby, the lower clip arm 2
The rear balance weight 18 and the rear balance weight 18 are connected to each other by two spaced parallel wires 20 with the rear rotating part 11 interposed therebetween. At this time, the wire 20 has passed through the pores 21, 21. The wire 19
The wire 20 is a thin wire.

With the above structure, the upper clip arm 1
The lower clip arm 2 and the lower clip arm 2 are horizontally suspended in the thermostat R. Therefore, the upper clip arm 1 is balanced with the front balance weight 17 so as to be vertically movable and equilibrium-stably supported. Similarly, the lower clip arm 2 is lifted up and down in balance with the rear balance weight 18, and is supported in a balanced and stable manner. Further, the upper clip arm 1 is supported by two spaced parallel wires 19 at two places spaced apart from each other at the base end 1A, and the lower clip arm 2 is supported at the base end 1A. It is supported by two parallel spaced wire rods 20 at two places spaced apart by 2A. With this configuration, there is no danger that the upper and lower clip arms 1 and 2 will alternately swing vertically (pitch) at the left and right ends. Therefore, during the tensile test of the test piece S, there is no possibility that an external force which may hinder the detection of the displacement of the marked lines marked on the upper and lower portions of the test piece S is applied to the test piece S.

Here, the configuration and operation of the front rotation unit 10 and the rear rotation unit 11 provided on the upper surface of the upper plate 6 will be described. The front rotating portion 10 is formed by an outer front guide pulley 12 which is arranged slightly in parallel with the outside, and an inner front guide pulley 12 which is in contact with an arrow L in FIG.
The outer front guide pulley 12 is provided with a rotation detector 22 for detecting a displacement of a marked line above the test piece S. Similarly, the rear rotating portion 11 includes an outer rear guide pulley 13.
And an inner rear guide pulley 13. The outer rear guide pulley 13 is also provided with a rotation detector 22 for detecting displacement of a lower marked line.

The front rotation unit 10 and the rear rotation unit 11 are provided so that the inner front guide pulley 12 and the inner rear guide pulley 13 are opposed to each other, and are shifted slightly closer to each other. . This front guide pulley 12, 1
2 and the rear guide pulleys 13 and 13 are both provided with a pair of pulleys at both ends of a rotatable rotary shaft at intervals. A V-shaped groove is formed on the outer peripheral edge of each of the pulleys, and the bottom of the groove forms a circumferential strip 23 around the pulley. The wire 19 and the wire 20 are hung on each of the circumferential ridges 23.

The above-mentioned arrow line L is a center line which is on the same plane as a plane including the axis of the above-mentioned rotation axis and is parallel to these axes. From the intersection of the arrow line L and the circumferential strip 23 of the pair of pulleys of the inner front guide pulley 12, the wires 19, 19 hang vertically downward in the figure, and are formed in the upper end wall of the constant temperature bath R. Through 26, the upper clip arm 1 in the thermostat R is supported vertically and freely and equilibrium stably. From the intersection of this arrow line L and the circumferential strip 23 of the pair of pulleys of the inner rear guide pulley 13, the wires 20, 20
Hangs vertically downward in the figure, passes through the insertion hole 26,
The lower clip arm 2 inside is vertically supported and stably supported in an equilibrium manner.

The outer line 24 in the drawing is parallel to the arrow line L and intersects with the circumferential stripe 23 of the pair of pulleys of the outer front guide pulley 12, and the center point 25 of the outer line 24
Is located on an extension of the center axis of the front guide rod 8.
Wires 19, 19 hanging from the intersection of the outer wire 24 and the circumferential ridge 23 pass through a small hole formed in the upper surface plate 6,
Outside the constant temperature bath R, a front balance weight 17 provided on the front guide rod 8 so as to be able to move up and down is supported. Similarly, the wires 20, 20 hanging from the pair of pulleys 23 of the outer rear guide pulley 13 pass through the small holes in the upper surface plate 6 and can be moved up and down on the rear guide rod 9 outside the thermostat R. Is supported by the rear balance weight 18 provided for.

In the figure, in addition to an upper clip arm 1 and a lower clip arm 2, a test piece S, a grip 14 for gripping the upper end of the test piece S, and a lower end thereof are held in a thermostatic chamber R. The grip portion 15 and the support rods 16 are arranged. The grip 14 and the grip 15 are supported by the support rod 1.
It is connected to the upper and lower crossheads of the tensile tester via 6, 16. Since the support rods 16 move up and down during the tensile test, insertion holes therefor are formed in the upper end wall and the lower end wall of the constant temperature bath R. Since the flow passage between the thermostat R and the outside air is limited to the insertion holes of the wires 19 and 20 and the insertion holes of the support rods, the temperature in the thermostat R is accurately maintained. Furthermore, in tensile tests at high and low temperatures,
Since there is no disturbance factor such as frost or deformation that hinders the lifting and lowering of the upper clip arm 1 and the lower clip arm 2, the displacement of the marking line can be accurately detected in a stable state over a wide temperature range.

It is easy to connect the rotation detector of the rotating part to the measurement control system to control the tensile test and to analyze the displacement of the mark marked on the test piece. . This measurement control system may be provided, for example, in the mark detection mechanism of the present invention, or may be incorporated in a control system of a tensile tester.

FIGS. 4 and 5 show another embodiment. Frame 3
Front pulleys 27, 27 on the lower surface of the lower plate 7
It is provided at a position opposite to the front guide pulleys 12 provided on the upper surface of the upper plate 6. Similarly, rear guide pulleys 28 are provided on the lower surface of the lower plate 7 at positions opposite to the rear guide pulleys 13 provided on the upper surface of the upper plate 6. With the above-described configuration, the upper clip arm 1 and the front balance weight 17 are connected in a loop by the wire 19 with the front guide pulleys 27 and 27 and the front guide pulleys 12 and 12 interposed therebetween. . Similarly, the lower clip arm 2 and the rear balance weight 18 are connected to the wire rod 2 via the rear guide pulleys 28 and 28 and the rear guide pulleys 13 and 13.
0 is connected in a loop.

That is, two wires 19 spaced apart in parallel.
Is fixed to two places spaced apart from each other on the upper surface of the base end 1A of the upper clip arm 1, and this wire 19 is passed through the flow hole 26 and the front guide pulleys 12, 12 and the other end is 2 with a space between the upper surfaces of the balance weights 17
It is fixed at the place. On the other hand, the tip of another two parallel wire rods 19 is fixed to two places spaced apart from each other on the lower surface of the front balance weight 17, and the wire rods 19 are passed through the front guide pulleys 27 and 27 to the constant temperature chamber R. By passing through the insertion hole 30 formed in the lower end wall, rising vertically, and fixing the other end to two places spaced apart from the lower surface of the base end 1A, the two parallel wires 19 are separated from each other. It is stretched out. At this time, this wire 19 is provided with fine holes 29, 29 formed at intervals at the base end 2A of the lower clip arm 2.
Is passing through. The lower clip arm 2 and the rear balance weight 18 are connected in a loop by a wire 20 in the same manner as described above.

[0027]

The marking line detection mechanism in the tensile test according to the present invention includes a pair of upper clip arms and a lower clip arm for holding a test piece in a thermostat, and corresponds to the respective clip arms outside the thermostat. The balance weight is provided to be able to move up and down freely, and the upper clip arm and the corresponding balance weight are connected by parallel wires spaced apart, and the upper clip arm can be moved up and down freely and equilibrium stably with a rotating part interposed. The lower clip arm is connected to the lower clip arm and the corresponding balance weight by parallel wires spaced apart from each other, and the lower clip arm is lifted up and down freely and equilibrium stably supported by another rotating part. Therefore, the pair of upper and lower clip arms,
Since there is no danger of pitching, the displacement of the mark marked on the test piece can be accurately detected. The pair of upper and lower clip arms can be lifted and lowered in a suspended state and supported stably in an equilibrium manner, so that they have an effect of following the displacement of the marking line with almost no resistance.

Since the pair of upper and lower clip arms are arranged in the thermostat, the air flow passage between the thermostat and the outside air is limited, so that the temperature in the thermostat can be accurately maintained. At low temperatures, there is no frost that hinders the vertical movement of the pair of upper and lower clip arms, and even at high temperatures,
Since the pair of upper and lower clip arms can be lifted up and down and supported stably in an equilibrium, the displacement of the marking line can be accurately detected in a stable state over a wide temperature range. Moreover, when using the existing thermostat, there is an effect that the thermostat can be easily remodeled economically.

Another rotating portion is provided in a position opposite to the rotating portion with a pair of guide pulleys, and the wire is parallelized with another rotating portion interposed between the upper clip arm and the balance weight. At the same time, and another rotating part is also interposed between the lower clip arm and the balance weight, and the wire is stretched at a parallel interval at the same time to connect the clip arm and the balance weight. Since the clip arms are connected in a loop, there is an effect that the pair of upper and lower clip arms can be supported more stably.

[Brief description of the drawings]

FIG. 1 is a front view showing a mark detection mechanism in a tensile test of the present invention.

FIG. 2 is a side view showing a mark detection mechanism.

FIG. 3 is a plan view showing the mark detection mechanism.

FIG. 4 is a front view showing another embodiment.

FIG. 5 is a side view of the same.

FIG. 6 is an explanatory view showing a conventional contact type mark detection device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 upper clip arm 2 lower clip arm 3 frame 4 support 5 support 8 front guide rod 9 rear guide rod 10 front rotation section 11 rear rotation section 17 front balance weight 18 rear balance weight 19 wire rod 20 wire rod S test piece R constant temperature Tank

Claims (1)

(57) [Claims] 1. A pair of upper and lower clip arms for holding a test piece are provided in a thermostat, and a balance weight corresponding to each of the clip arms is provided outside the thermostat so as to be movable up and down. and a balance weight corresponding to the arm connected by equilibrium wires spaced, with intervening rotation unit, a stable well Tsuri支the upper clip arm liftable and equilibrium, the
Put the guide pulley as a pair at a position
Moving part, and the upper clip arm and balance weight
And separate the wires in parallel with another rotating part
The lower clip arm and the corresponding balance weight are also connected by parallel wires spaced apart from each other, and the lower clip arm can be raised and lowered freely and equilibrium stably with another rotating part interposed. Support , clip arm and bar
A mark detection mechanism in a tensile test, wherein a lance weight is connected in a loop .