An adjustable rectangular specimen stop for a tensile testing machine
By setting an adjustable limiting device on the fixture of the tensile testing machine, the problem of inaccurate limiting of rectangular specimens is solved, and the center line of the specimen is accurately aligned with the center line of the fixture, thereby improving the accuracy and efficiency of testing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HANGXIN MATERIAL TECH CO LTD
- Filing Date
- 2025-07-31
- Publication Date
- 2026-07-03
Smart Images
Figure CN224456380U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of clamping of tensile testing machines, and specifically to an adjustable rectangular specimen limiting device for tensile testing machines. Background Technology
[0002] When performing tensile tests on metallic materials at room temperature using a tensile testing machine, it is crucial to ensure that the specimen is subjected to uniaxial force, meaning that the centerline of the specimen must coincide with the centerline of the fixture. Misalignment will affect the accuracy of the test results. For specimens with circular or rectangular cross-sections, a circular groove is typically created in the fixture to ensure the centerline of the specimen aligns with the fixture's centerline. However, when fixing rectangular specimens, double-sided tape is often used to attach positioning baffles to the fixture to achieve this alignment. In practice, however, it has been found that with an increased number of tests and frequent clamping, the baffles tend to shift, affecting the reliability of the positioning and the accuracy of the test results. Furthermore, the continuous adjustment of the baffle positions wastes time and reduces testing efficiency. Utility Model Content
[0003] The purpose of this invention is to provide an adjustable rectangular specimen limiting device for a tensile testing machine, which solves the problems of difficult and inefficient specimen limiting for rectangular cross-sections without damaging the clamping surface.
[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0005] A rectangular specimen limiting device for a tensile testing machine, applied to an upper clamp and a lower clamp, includes a connecting base and a limiting rod, wherein the limiting rod is bolted to the connecting base; a pin hole is provided on one side of both the upper clamp and the lower clamp, and a pin is provided on the connecting base, wherein the pin is inserted into the pin hole.
[0006] Furthermore, the limiting rod is L-shaped and includes a connecting part and a limiting part. The connecting part is provided with an elongated hole. The top of the connecting base is provided with a slot, and the slot is provided with a bolt hole. The connecting part is placed in the slot and is detachably connected to the top of the connecting base by bolts.
[0007] Furthermore, the connecting part is provided with a scale, which is located on one side of the elongated hole.
[0008] Furthermore, the pin is located at the corner of the bottom of the connecting base.
[0009] By adopting the above technical solution, the beneficial technical effects of this utility model are:
[0010] This invention adds adjustable limiting devices to both the upper and lower clamps. By measuring the width of the rectangular cross-section sample and the clamp width, the limiting distance can be accurately calculated. The relative position of the connecting base and the limiting rod is adjusted through the elongated hole and scale lines, and the limiting connecting rod is locked with a stud. When the sample abuts against the limiting rod, the centerline of the sample coincides with the centerline of the clamp, ensuring the coaxiality of the sample under uniaxial force and tension. This invention solves the limiting problem in room temperature tensile testing of rectangular metal samples, improving testing efficiency and accuracy. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of an adjustable rectangular specimen limiting device for a tensile testing machine.
[0012] Figure 2 This is a schematic diagram of the limit rod.
[0013] Figure 3 This is a schematic diagram of the connection base.
[0014] Figure 4 This is a schematic diagram of a limit device applied to a fixture. Detailed Implementation
[0015] like Figure 1 As shown, an adjustable rectangular specimen limiting device for a tensile testing machine is applied to an upper clamp 30 and a lower clamp 31. It includes a connecting base 1 and a limiting rod 2. The inner side of the connecting base 1 is parallel to and at the same height as the side of the clamping surface, ensuring that the lower surface of the limiting rod is in contact with the clamping surface. The limiting rod 2 is bolted to a slot in the connecting base 1. Both the upper clamp 30 and the lower clamp 31 have pin holes 32 on one side. A pin 3 is provided on the connecting base 1, located at a corner at the bottom of the connecting base 1, and inserted into the pin hole 32.
[0016] like Figure 4As shown, according to the specifications of the fixture, the upper fixture 30 clamps the upper end of the sample through the gap 33, and the lower fixture 31 clamps the lower end of the sample through the gap 33. The length of the gap 33 or the width of the fixture can be obtained according to the specifications of the fixture. Then, by measuring the width of the sample's clamping end, the specific value of the distance between the edge of the sample's clamping end and the edge of the gap 33 is calculated before clamping. Then, the position between the connecting base 1 and the limiting rod 2 is adjusted to restrict the edge of the sample, so that the center line of the sample coincides with the center line of the fixture. For example, assuming the length of the gap 33 is 8 cm and the measured width of the sample's clamping end is 5 cm, then the distance between the edges of the sample's clamping end on both sides and the edges of the gap 33 on both sides needs to be 1.5 cm. Therefore, the position of the limiting rod needs to be adjusted so that the distance between the same inner side of the limiting part 22 of the limiting rod and the closer end of the gap 33 is 1.5 cm, and the distance between the same inner side of the limiting part 22 and the edge of the gap 33 is 6.5 cm. During clamping, the outer edge of the sample will adhere to the inner wall of the limiting rod 2. The position of the limiting rod 2 on the connecting base 1 is adjusted by the elongated hole so that when the edge of the sample adheres to the inner wall of the limiting rod 2, the limiting purpose is achieved, that is, the center line of the sample coincides with the center line of the fixture.
[0017] like Figure 2 and Figure 3 As shown, the limiting rod 2 is L-shaped, including a connecting part 21 and a limiting part 22. The connecting part 21 has an elongated hole 23. The top of the connecting base 1 has a slot 11 with a bolt hole 12. The connecting part 21 is placed in the slot 11 and detachably connected to the top of the connecting base 1 by bolts. The connecting part 21 has a scale, which is located on one side of the elongated hole 23, and the smallest unit of the scale is millimeters. When the bolt is connected to the outermost edge of the elongated hole 23, the 0 mark of the scale coincides with the end face of the connecting base 1, and the end face of the connecting base 1 is in contact with the surface of the fixture. The end line of the scale coincides with the inner side of the limiting part 22. The edge of the sample clamping end will be in contact with the inner wall of the limiting part 22. By adjusting the position between the connecting base 1 and the limiting rod 2 with precision according to the scale, the edge of the sample will be in contact with the inner wall of the limiting part 22, thus achieving the purpose of aligning the center line of the sample with the center line of the fixture.
[0018] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.
Claims
1. An adjustable rectangular specimen limiting device for a tensile testing machine, applied to the upper and lower clamps, characterized in that, It includes a connecting base and a limiting rod, the limiting rod being bolted to the connecting base; each of the upper and lower clamps has a pin hole on one side, and a pin is provided on the connecting base, the pin being inserted into the pin hole.
2. A rectangular specimen gage device for a tensile testing machine according to claim 1, wherein, The limiting rod is L-shaped and includes a connecting part and a limiting part. The connecting part is provided with an elongated hole. The top of the connecting base is provided with a slot, and the slot is provided with a bolt hole. The connecting part is placed in the slot and is detachably connected to the top of the connecting base by bolts.
3. The adjustable rectangular specimen limiting device for a tensile testing machine according to claim 2, characterized in that, The connecting part is provided with a scale, which is located on one side of the elongated hole.
4. A rectangular specimen gage device for a tensile testing machine according to claim 1 wherein, The pin is located at the corner of the bottom of the connecting base.