JPH0648387Y2 - Material testing machine - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a material testing machine equipped with a gripper shake prevention device.

B. Prior Art In the material testing machine, as shown in FIG. 4, the crosshead 4 is arranged above the table 3 so as to be vertically movable by an appropriate means such as a screw rod. For example, the upper grip 1 via the load cell 5 to the crosshead 4
The lower grip 2 is fixed to the table 3 by the lower joint 6, and the crosshead 4 is lifted to apply a tensile load to the test piece, and the load cell 5 detects the tensile load.

In such a configuration, the universal joint 7 is interposed between the load cell 5 and the upper grip 1 so that the eccentric load does not act on the load cell 5.

C. Problem to be Solved by the Invention When setting the test piece, while holding the test piece vertically, the handle 8 of the gripping tool is turned to grip the test piece by the gripping teeth. When is hung from the universal joint 7, the upper grip 1 swings. For this reason, it is necessary to set while suppressing shaking, and there is a problem that it is difficult to set especially in the case of a foil-shaped test piece having low rigidity.

The technical problem of the present invention is to make it possible to restrain and release the universal joint with a simple operation.

D. Means for Solving the Problems The material testing machine of the present invention is a gripping tool that is attached to a suspension member such as a crosshead of a testing machine through a universal joint such as a universal joint formed by connecting a pair of elements. A gripper shake prevention device for preventing shaking is provided, and the gripper shake prevention device includes a support member provided on the test piece side element of the universal joint, a locking member provided on the hanging member side element, and the support member. And a fixing member that is movably provided in the axial direction and that can be locked by the locking member.

If a crosshead, load cell, or the like can be used as the locking member, the locking member is omitted and the fixing member is locked to the crosshead, load cell, or the like.

As a method of locking the fixing member, a method of pressing the locking member or the hanging member with a spring, a method of pressing with a screw or a locking member, a method of engaging the upper part of the fixing member with the hanging member, or the like can be used. .

E. Action When setting the test piece, move the fixed member to the suspension member side and lock it with the locking member or the suspension member to fix the pair of universal joints. Alternatively, the test piece side element is fixed to the suspension member. This constrains the universal joint. If the fixing member is moved to the test piece side and supported by the supporting member, the universal joint is unfixed and the test can be performed.

F. Example An example of the material testing machine according to the present invention will be described with reference to FIGS. 1 to 3.

FIG. 1 shows the first embodiment, the right half of FIG. 1 shows the released state of the universal joint, and the left half shows the restrained state.

The universal joint 7 is composed of, for example, a suspension member side element 7U, which is a crosshead, and a test piece side element 7L, and the test piece side element 7L of the universal joint 7 includes:
A support member 9 having a flange 9A at the lower portion is attached by a push screw 12, and a ring-shaped locking member 10 is attached by a push screw 13 to the crosshead side element 7U. A fixing member 11 is attached to the support member 9 so as to be movable in the axial direction.

In the first embodiment, the support member 9 is a sleeve-like collar, and the lower portion of the fixing member 11 is slidably inserted into the support member 9 so as to be interposed between the upper end of the supporting member 9 and the upper end portion of the fixing member 11. A spring (14) is provided and the fixing member (11) is urged upward by the spring (14). The pin 15 protruding from the support member 9 is movable in the axial direction in the key groove 16 formed on the inner peripheral surface of the fixing member 11, and at the same time, the fixing member is fixed.
A lock groove 17 that is continuous with the key groove 16 in 11 is movable in the rotation direction. That is, the locking groove 17 is fixed to the fixing member 11.
Is formed in a horizontal fan shape at the lower part of the pin to lock the upward movement of the pin 15 (see FIG. 2), and the key groove 16 is formed at one end of the locking groove 17 in the vertical direction.

In the released state, the pin 15 is in the locking groove 17, and from this state, when the fixing member 11 is rotated to position the pin 15 in the key groove 16 to release the force, the fixing member 11 is urged by the spring 14. It slides upward and is pressed against the locking member 10. By this pressing force, the respective members 9, 10, 11 are integrated, and the upper and lower elements 7L, 7U are fixed as shown in the left half of FIG. When the setting of the test piece is completed, when the fixing member 11 is pulled down and rotated, the pin 15 is locked in the locking groove 17 and the fixing member 11 is fixed to the support member 9. This releases the fixation of the elements 7L, 7U as shown in the right half of FIG.

FIG. 3 shows a second embodiment, in which the left half shows the released state of the universal joint 7, and the right half shows the restrained state. In FIG. 3, the same parts as those in FIG. 1 are designated by the same reference numerals.

In this embodiment, the support member 9 is a collar having a male thread 9a and the flange 9A is formed from a positioning nut. A female screw 11 a is formed on the fixing member 11 and screwed to the supporting member 9. When setting the test piece, the fixing member 11 is rotated and pressed against the locking member 10. This pressing force fixes the upper and lower elements 7L, 7U as shown in the right half of FIG. When the test piece setting is completed, turn the fixing member 11 in the opposite direction to the locking member.
Separate from 10 and lower until it contacts flange 9A. As a result, the universal joint 7 is released as shown in the left half of FIG.

The crosshead 4 or the load cell 5 may be configured to press the fixing member 11. In this case, the locking member 10 can be omitted. Further, the support member 9 and the locking member 10 may be formed integrally with each of the elements 7L and 7U, but if they are screw-fixed as in the above embodiment, the existing universal joint will be prevented from swinging of this kind. There is an advantage that the device can be mounted.

G. Effect of the Invention The gripper shake prevention device provided in the material testing machine of the present invention provides a support member on the test piece side element of the universal joint, and a fixing member movably provided on this holding member. Since it can be locked to the locking member or the suspension member, the universal joint can be easily fixed to prevent the gripping tool from shaking when the test piece is set, and the test piece can be easily set. In addition, the fixation of the universal joint can be easily released after the test piece is set.

[Brief description of drawings]

1 is a sectional view showing a first embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is a sectional view showing a second embodiment, and FIG. 4 is a material test. It is a schematic front view which shows a machine. 1: Upper grip, 4: Crosshead 5: Load cell 7: Universal joint 7U: Lifting member side element, 7L: Specimen side element 9: Support member, 10: Locking member 11: Fixing member

Claims (2)

[Scope of utility model registration request] 1. A material testing machine equipped with a device for preventing swinging of a grip attached to a suspension member of a testing machine through a universal joint formed by connecting a pair of elements, the test of the universal joint being performed. A gripping tool having a support member provided on the one-side element, a locking member provided on the hanging-member side element, and a fixing member movably provided on the support member in the axial direction and capable of locking the locking member. A material testing machine equipped with a shake prevention device. 2. A material testing machine equipped with a device for preventing swinging of a grip provided on a suspension member of a testing machine through a universal joint formed by connecting a pair of elements, the test of the universal joint being performed. A material test comprising a gripper shake prevention device having a support member provided on one-sided element and a fixing member that is movably attached to the support member in the axial direction and can be locked to the suspension member. Machine.