JPH0441294B2 - - Google Patents

Description

[Detailed description of the invention] (a) Field of industrial application The present invention relates to a tensile torsion testing machine that applies a tensile load to a test piece and simultaneously applies a compressive load to test the test piece in tensile torsion. especially,
The present invention relates to a torsion load verification device that verifies the torsion load detector.

(b) Prior Art For example, electric overhead lines installed on steel towers in mountainous regions are subjected to tensile loads and torsional loads due to snow and wind. Therefore, it is necessary to apply a tensile load to this type of overhead wire and at the same time apply a torsional load to it and perform a tensile torsion test. Figure 1 shows a testing machine that performs tensile torsion tests on test specimens such as electrical overhead lines in mountainous regions. This testing machine is a horizontal type in which a fixed crosshead 1 and a movable crosshead 2 are arranged laterally with an interval between them. It is guided so that it can move in the direction. The test piece is held by a pair of grips 4L and 4R. One grip 4L is rotatably supported by the fixed crosshead 1. Further, the fixed crosshead 1 is provided with a torsional load loading mechanism consisting of a motor 5, and the grip 4L is connected to the motor 5 via a reducer 6 and a transmission 7.
is transmission connected to. The other grip 4R is rotatably supported by the movable crosshead 2, and is restrained in the direction of rotation with respect to the movable crosshead 2 via a torsional load detector. Further, a base 8 is disposed on the opposite side of the test specimen to the movable crosshead 2, and a tensile load applying mechanism consisting of a cylinder 9 and a ram 10 is provided on this base 8. The movable crosshead 2 is transmission connected to the ram 10 of the cylinder 9 by a strut 11 and a yoke 12.

In this testing machine, when the cylinder 9 is driven, the yoke 12 is pressed by the ram 10, and the movable crosshead 2 moves integrally with the column 11. Therefore, a tensile load is applied to the test piece by the grip 4R of the movable crosshead 2. At the same time, when the motor 5 of the fixed crosshead 1 is driven, the grip 4 is moved by the transmission 7 and reduction gear 6.
Rotational torque is applied to L. Therefore, a torsional load is applied to the test piece by the grip 4L, and the test piece is subjected to a tensile torsion test. The reaction force of the torsional load on the test piece is transmitted from the grip 4R to the movable crosshead 2 via the torsional load detector. Therefore, the torsional load on the test piece can be detected by the torsional load detector.

This testing machine can also perform fatigue tests on specimens. The test piece is held by a pair of grips 13L, 13
One grip 13L is transmission-connected to a servo hydraulic actuator 15 on the base 14. The other grip 13R is fixed to the fixed crosshead 1. Therefore, when the actuator 15 is driven, a repetitive load is applied to the test piece by the grip 13L, and the test piece is subjected to a fatigue test. The reaction force of the repeated load is the grip 13
R to the fixed crosshead 1.

In this tensile torsion testing machine, in order to verify the torsional load detector of the movable crosshead 2, a verification torsion load is applied to the grip 4R of the movable crosshead 2 using a verification torsion load loading mechanism such as a hydraulic jack. Then, the verification torsion load may be compared with the detected value of the torsion load detector. This allows the torsion load detector to be verified. However, when a test piece is actually subjected to a tensile torsion test, a tensile load is applied to the test piece, so the grip 4R of the movable crosshead 2 receives a reaction force of the tensile load in addition to the torsional load. Therefore, it is inevitable that the reaction force of the tensile load will affect the detected value of the torsional load detector. Conventionally, only the verification torsional load was applied to the grip 4R of the movable crosshead 2.
In addition to this, the torsional load detector was also verified using this method. For this reason, when actually performing a tensile torsion test on a test piece, it was not possible to accurately detect the torsional load.

(c) Purpose Therefore, the present invention is capable of accurately verifying the torsion load detector of this type of tensile torsion testing machine and accurately detecting the torsional load when actually performing a tensile torsion test on a test piece. This was done to make it possible.

(d) Configuration This invention provides a tensile torsion testing machine in which a movable crosshead is moved by a tensile load loading mechanism in the base to apply a tensile load to a test piece, and a compression rod is arranged between the movable crosshead and the base. do. Then, place this compression rod against the end surface of the grip of the movable crosshead and the wall surface of the base,
A thrust bearing is interposed between the end face of the grip and the compression rod or between the wall surface of the base and the compression rod, and the movable crosshead is moved by a tensile load loading mechanism to apply a compression load to the compression rod. Further, a verification torsion load is applied to the grip of the movable crosshead by a verification torsion load loading mechanism attached to the movable crosshead, and this verification torsion load is compared with the detected value of the torsion load detector. This allows the torsion load detector to be verified.

(E) Examples Examples of the present invention will be described below. FIG. 3 shows the testing machine of FIG. 1 in which the present invention is applied. As shown in FIG. 4, the movable crosshead 2 includes a plurality of rotatably supported rollers 16.
, and each roller 16 is rotatably engaged with the frame 3. Movable crosshead 2 has roller 1
6 on the frame 3 and guided so as to be movable in the lateral direction. Further, a base 8 is arranged on the opposite side of the test piece with respect to the movable crosshead 2,
This base 8 is provided with a tensile load loading mechanism consisting of a cylinder 9 and a ram 10, as in the case of FIG. Movable crosshead 2 is attached to column 1
1 and the yoke 12 of the ram 1 of the cylinder 9
It is transmission connected to 0.

The torsional load on the test piece is measured by a pair of load cells 17.
It is detected by a torsional load detector consisting of:
The grip 4R of the movable crosshead 2 has a support shaft 18 passing through the movable crosshead 2 and a nut 19 screwed onto the protruding end of the support shaft 18, and includes a self-aligning radial bearing 20 and a self-aligning thrust bearing 21.
It is rotatably supported by. Each load cell 17 is spaced apart from each other and fixed to the movable crosshead 2. The grip 4R has a detection arm 22 extending between the load cells 17,
The detection arm 22 is fixed to the grip 4R with a key. The detection arm 22 is the load cell 17
, and the grip 4R is restrained in the rotational direction with respect to the movable crosshead 2 via the load cell 17.

This device has a compression rod 23 of suitable length. The compression rod 23 is connected to the movable crosshead 2 and the base 8.
It is arranged on the load axis W of the tensile load between them, and faces the end face of the nut 19, that is, the end face of the grip 4R of the movable crosshead 2. A thrust bearing 2 is placed between the end face of the nut 19 and the compression rod 23.
4 is provided, the thrust bearing 24 is fixed to the nut 19, and the compression rod 23 is engaged with the thrust bearing 24. Furthermore, the compression rod 23 faces the wall surface of the base 8 and is fixed to this wall surface.

A hydraulic jack 25 is used as the verification torsional load loading mechanism, and the hydraulic jack 25 is mounted on a beam 26 attached to the movable crosshead 2. The grip 4R of the movable crosshead 2 has a flat plate-shaped verification arm 27, and the verification arm 27 is fixed to the grip 4R with a bolt.
Furthermore, a loop type detector 28 consisting of a leaf spring and a dial gauge is connected to the tip of the verification arm 27 and the connecting rod 2.
The verification arm 27 is transmission connected to a connecting rod 29 via a detector 28, and is connected to a hydraulic jack 25 by the connecting rod 29. The loop type detector 28 is a hydraulic jack 2
Detect the test torsional load of 5.

This device can accurately test the torsional load detector, that is, the load cell 17. To test the load cell 17, the cylinder 9 of the base 8 is actuated to move the movable crosshead 2 laterally. The movable crosshead 2 approaches the base 8, and the compression rod 23 is sandwiched between the thrust bearing 24 and the wall of the base 8. A compressive load is therefore applied to the compression rod 23. The reaction force is transmitted from the thrust bearing 24 to the nut 19 of the grip 4R, and the grip 4R receives the reaction force of the compressive load. At the same time, when the hydraulic jack 25 of the beam 26 is driven, the connecting rod 29 and the loop detector 28
Rotational torque is transmitted to the verification arm 27, and a torsional load is applied to the grip 4R of the movable crosshead 2. The leaf spring of the loop type detector 28 deforms according to the rotational torque of the verification arm 17,
The dial gauge detects the amount of deformation of the leaf spring. Therefore, the loop-type detector 28 detects the verification torsional load of the grip 4R. The thrust bearing 24 transmits the reaction force of the compressive load of the compression rod 23 to the grip 4R, and at the same time functions to allow rotation of the grip 4R. Therefore, grip 4R
The reaction force of the test torsional load is transmitted to the load cell 17 by the detection arm 22, and the load cell 17 receives the transmitted reaction force. Therefore, the test torsional load of the grip 4R is detected by the load cell 17. Therefore, when the detected value of the loop type detector 28 and the detected value of the load cell 17 are compared,
Load cell 17 can be verified.

When a test piece is actually subjected to a tensile torsion test, a tensile load is applied to the test piece, and the grip 4R receives a reaction force from the tensile load. Therefore, as described above, the reaction force of the tensile load influences the detected value of the load cell 17. In this device, since a compressive load is applied to the compression rod 23, the grip 4R receives a reaction force of the compressive load in addition to the verification torsional load. compression rod 2
3 is placed between the movable crosshead 2 and the base 8, its compressive load acts on the grip 4R in the same direction as the tensile load of the test piece. Therefore, the grip 4R receives a reaction force corresponding to the reaction force of the tensile load on the test piece. Therefore, the load cell 17 can be accurately verified, and when a test piece is actually subjected to a tensile torsion test, the load cell 17 can accurately detect the torsional load. Unlike the test piece actually tested, the compression rod 23
may be made of any material and shape, and its cost is low.

It should be noted that various modifications of the present invention are possible in addition to the above-mentioned embodiments. For example, it is also possible to support the compression rod 23 by the struts 11 of the movable crosshead 2 until it is clamped and held between the thrust bearing 24 and the wall of the base 5. Further, in the above embodiment, the thrust bearing 24 is interposed between the end face of the nut 19, that is, the end face of the grip 4R, and the compression rod 23. may be interposed. Grip 4
In addition to the hydraulic jack 25, various types of verification torsion load loading mechanisms can be considered for applying the verification torsion load to R.

(f) Effects As explained above, the present invention can accurately detect torsional load using a torsional load detector and accurately detect torsional load when actually performing a tensile torsion test on a test piece, thereby achieving the intended purpose. can be achieved.

[Brief explanation of drawings]

Fig. 1 is a plan view of a horizontal tensile torsion testing machine, Fig. 2 is a side view of Fig. 1, Fig. 3 is a plan view showing an embodiment of the present invention, and Fig. 4 is a front view of Fig. 3. It is. 1...Fixed crosshead, 2...Movable crosshead, 4L, 4R...Gripper, 5...Motor,
8... Base, 9... Cylinder, 17... Load cell, 23... Compression rod, 24... Thrust bearing,
25...Hydraulic jack, 28...Loop type detector.

Claims (1)

[Claims] 1. A test piece is gripped by a pair of grips, one grip is rotatably supported on a fixed crosshead, and the other grip is connected to a torsional load loading mechanism provided on the fixed crosshead. The test piece is rotatably supported on a movable crosshead, and restrained in the rotational direction via a torsional load detector, and a base is disposed on the opposite side of the test piece to the movable crosshead. is transmission connected to a tensile load applying mechanism provided on the base, and the movable crosshead is moved by the tensile load applying mechanism to apply a tensile load to the test piece, and at the same time, the torsional load applying mechanism moves the movable crosshead. In a tensile torsion testing machine in which a torsional load is applied to a test piece and the torsional load on the test piece is detected by the torsional load detector, a compression rod is disposed between the movable crosshead and the base, A rod is opposed to the end surface of the grip of the movable crosshead and the wall surface of the base, and a thrust bearing is interposed between the end surface of the grip and the compression rod or between the wall surface of the base and the compression rod, and the tensile load is applied. The movable crosshead is moved by a mechanism, a compression load is applied to the compression rod, and a verification torsional load is applied to the grip of the movable crosshead by a verification torsional load loading mechanism attached to the movable crosshead, and the verification is performed. A torsional load verification device characterized in that the torsional load detector is verified by comparing the torsional load with a detected value of the torsional load verification device.