A fixture device for bolt tension load testing

Abstract

The utility model relates to guardrail manufacturing technical field especially relates to a clamp device for bolt tensile load test, including the inner clamp for connecting the both ends of the bolt to be tested and the outer clamp located the outer of inner clamp, the outer wall of inner clamp is equipped with limiting portion, the outer clamp is equipped with the accommodating cavity, one end of accommodating cavity is equipped with inner clamp through -hole, the outside wall of outer clamp is equipped with the placement hole with accommodating cavity intercommunication, the outer clamp is equipped with clamp connecting rod in the other end away from inner clamp through -hole, the inner clamp can pass through placement hole and enter accommodating cavity, and extend into inner clamp through -hole, and limiting portion can be limited with the inner wall of accommodating cavity and fixed, the utility model reserves the connecting port with other accessories, can directly carry out bolt tensile load test, improves test efficiency.

Description

Technical Field

[0001] This utility model relates to the field of guardrail manufacturing technology, and in particular to a clamping device for bolt tensile load testing. Background Technology

[0002] A corrugated steel guardrail is a type of movable steel guardrail made of corrugated steel plates used at openings in the median strip of a highway. The guardrail consists of two corrugated steel guardrail plates and two posts fixedly clamped between them.

[0003] According to the standard GB / T 31439.1–2015 for tensile load tests on bolted connections, existing test fixtures consist of an inner sleeve and an outer sleeve. The inner sleeve is responsible for loading the bolts, while the outer sleeve is used to clamp the inner sleeve and connect to the material testing machine fixture. The outer sleeve fixture requires additional matching to the inner sleeve, which makes test preparation cumbersome and complex, increasing not only time costs but also the probability of test errors. This is because existing test fixtures, in their design, only focus on achieving their basic functions, without reserving comprehensive interfaces and designs for compatibility with other equipment or components. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art. This utility model provides a clamp device for bolt tensile load testing, which has reserved connection ports with other accessories, enabling direct bolt tensile load testing and improving testing efficiency.

[0005] To address the aforementioned problems, this utility model proposes a clamping device for bolt tensile load testing, comprising an inner clamp for connecting the two ends of the bolt to be tested and an outer clamp disposed outside the inner clamp;

[0006] The outer wall of the inner clamp is provided with a limiting part;

[0007] The outer clamp has a receiving cavity, one end of which has an inner clamp through hole, and the outer side wall of the outer clamp has a placement hole communicating with the receiving cavity. The outer clamp has a clamp connecting rod at the other end away from the inner clamp through hole.

[0008] The inner clamp can enter the receiving cavity through the placement hole and extend into the inner clamp through hole, and the limiting part can be limited and fixed with the inner wall of the receiving cavity.

[0009] As an improvement to the above technical solution, the limiting part is provided along the outer wall of the inner clamp, and the limiting part and the outer wall of the inner clamp have a stepped structure;

[0010] A stepped portion is provided at the junction of the receiving cavity and the through hole of the inner clamp, and the limiting portion can be limited and fixed with the stepped portion.

[0011] As an improvement to the above technical solution, the placement hole is provided with a clearance hole at one end near the inner clamp through hole, and the clearance hole communicates with the inner clamp through hole.

[0012] As an improvement to the above technical solution, the opening width of the placement hole is greater than or equal to the outer diameter of the limiting part, the diameter of the inner clamp through hole is equal to the outer diameter of the inner clamp, and the opening width of the clearance hole is less than the opening width of the placement hole.

[0013] As an improvement to the above technical solution, the inner clamp is provided with a mounting cavity, and the bottom of the mounting cavity is provided with a mounting through hole.

[0014] As an improvement to the above technical solution, the inner clamp provided at the top of the bolt is the first inner clamp, and the inner clamp provided at the bottom of the bolt is the second inner clamp.

[0015] The first inner clamp has a limiting groove at the junction of the mounting cavity and the mounting through hole. The bottom end of the bolt passes through the mounting cavity and the mounting through hole in sequence, and the end of the bolt is fixed to the mounting cavity. The bottom end of the bolt passes through the mounting through hole and the mounting cavity of the second inner clamp in sequence, and a nut is threaded to the bottom of the bolt.

[0016] As an improvement to the above technical solution, the limiting groove is symmetrically arranged on both sides of the mounting through hole, and the inner wall of the limiting groove is an arc surface structure.

[0017] As an improvement to the above technical solution, the connecting rod, the inner clamp through hole, the mounting cavity, and the mounting through hole are all coaxially arranged.

[0018] The following are the beneficial effects of implementing this utility model:

[0019] This utility model includes an inner clamp and an outer clamp; both ends of the bolt to be tested are connected to the inner clamp, and the outer wall of the inner clamp is provided with a limiting part. Compared with the prior art, the above-mentioned outer clamp has a receiving cavity, one end of which has a through hole for the inner clamp, and the outer side wall of the outer clamp has a placement hole communicating with the receiving cavity. The outer clamp provides a corresponding interface and installation space for the installation of the inner clamp. In addition, the outer clamp is also provided with a connecting rod for connecting to the testing machine. That is, after the outer clamp and the inner clamp are installed together, tensile load testing can be performed. It can adapt to various specifications of test fixtures, ensuring that the combined fixture is more stable and reliable during the test, and effectively improving the testing efficiency. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of the clamp in one embodiment of the present invention;

[0021] Figure 2This is a front view of an embodiment of the external clamp of this utility model;

[0022] Figure 3 This is a cross-sectional view of the external and internal clamps during installation according to an embodiment of the present invention. Detailed Implementation

[0023] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0024] See Figures 1 to 3 As shown, this utility model embodiment provides a clamping device for bolt tensile load testing, including an inner clamp 1 for connecting the two ends of the bolt to be tested and an outer clamp 2 disposed outside the inner clamp 1;

[0025] The outer wall of the inner clamp 1 is provided with a limiting part 11;

[0026] The outer clamp 2 has a receiving cavity 21 inside, one end of the receiving cavity 21 has an inner clamp through hole 22, the outer side wall of the outer clamp 2 has a placement hole 23 communicating with the receiving cavity 21, and the other end of the outer clamp 2 away from the inner clamp through hole 22 has a clamp connecting rod 25.

[0027] The inner clamp 1 can enter the receiving cavity 21 through the placement hole 23 and extend into the inner clamp through hole 22. The limiting part 11 can be limited and fixed with the inner wall of the receiving cavity 21.

[0028] The inner clamp 1 enters the receiving cavity 21 through the placement hole 23 and is embedded into the inner clamp through hole 22 along the receiving cavity 21. The limiting part 11 on the side wall of the inner clamp 1 is limited and fixed to the inner wall of the receiving cavity 21. At this time, the installation of the outer clamp 2 onto the inner clamp 1 is completed. Then, the two ends of the bolt 3 to be tested are connected to the inner clamp 1 respectively, and then connected to the clamp of the testing machine by the connecting rod 25 of the outer clamp 2, so that the tensile load test can be carried out.

[0029] This utility model includes an inner clamp 1 and an outer clamp 2. Both ends of the bolt 3 to be tested are connected to the inner clamp 1, and the outer wall of the inner clamp 1 is provided with a limiting part 11. Compared with the prior art, the outer clamp 2 has a receiving cavity 21, one end of which has an inner clamp through hole 22, and the outer wall of the outer clamp 2 has a placement hole 23 communicating with the receiving cavity 21. The outer clamp 2 provides a corresponding interface and installation space for the installation of the inner clamp 1. In addition, the outer clamp 2 is also provided with a connecting rod 25 for connecting to the testing machine. That is, after the outer clamp 2 and the inner clamp 1 are installed together, tensile load testing can be performed. It can adapt to various specifications of test fixtures, ensuring that the combined fixture is more stable and reliable during the test, and effectively improving testing efficiency.

[0030] To address the issue of unstable posture caused by displacement within the outer clamp 2 during testing of the inner clamp 1, preferably, the limiting part 11 is disposed along the outer wall of the inner clamp 1, and the limiting part 11 and the outer wall of the inner clamp 1 have a stepped structure;

[0031] A stepped portion is provided at the junction of the receiving cavity 21 and the inner clamp through hole 22, and the limiting portion 11 can be limited and fixed with the stepped portion.

[0032] The limiting part 11 is arranged around the outside of the inner clamp 1 and has a stepped structure with the outer wall of the inner clamp 1. The stepped structure of the inner clamp 1 and the aforementioned stepped part mutually limit and abut against each other. This ensures that the inner clamp 1 and the outer clamp 2 cannot undergo relative displacement during the tensile load test, thus ensuring the stability of the test process.

[0033] To optimize the installation process of the bolt to be tested, preferably, the placement hole 23 has a clearance hole 24 at one end near the inner clamp through hole 22, and the clearance hole 24 communicates with the inner clamp through hole 22. Because of the clearance hole 24, both ends of the bolt to be tested 3 can be connected to the inner clamp 1 first. The clearance hole 24 provides clearance space for the bolt 3, allowing the inner clamp 1, after connecting the bolt 3, to enter the placement hole 23 and complete the step of embedding into the inner clamp through hole 22.

[0034] More preferably, the opening width of the placement hole 23 is greater than or equal to the outer diameter of the limiting part 11, the diameter of the inner clamp through hole 21 is equal to the outer diameter of the inner clamp 1, and the opening width of the clearance hole 24 is less than the opening width of the placement hole 23.

[0035] Preferably, the inner clamp 1 has a mounting cavity 12, and the bottom of the mounting cavity 12 has a mounting through hole 13. The end of the bolt 3 enters the mounting cavity 12 and extends into the mounting through hole 13. The end of the bolt 3 or the nut can be embedded in the mounting cavity 12 and can be fixed and limited by the bottom of the mounting cavity 12, thus completing the connection between the bolt 3 and the inner clamp 1.

[0036] More preferably, the inner clamp 1 located at the top of the bolt 3 is the first inner clamp, and the inner clamp located at the bottom of the bolt is the second inner clamp;

[0037] A limiting groove 14 is provided at the junction of the mounting cavity 12 and the mounting through hole of the first inner clamp. The bottom end of the bolt 3 passes through the mounting cavity 12 and the mounting through hole 13 in sequence, and the end of the bolt 3 is fixedly positioned with the mounting cavity 12. The bottom end of the bolt 3 passes through the mounting through hole 13 and the mounting cavity 12 of the second inner clamp in sequence, and a nut is threadedly connected to the bottom of the bolt 3. A stepped structure is provided at the junction of the end of the bolt to be tested and its shaft. The limiting groove 14 provides a space for the stepped structure and limits and fixes the end.

[0038] More preferably, the limiting groove 14 is symmetrically arranged on both sides of the mounting through hole 13, and the inner wall of the limiting groove 14 is an arc surface structure.

[0039] More preferably, the connecting rod 25, the inner clamp through hole 22, the mounting cavity 12, and the mounting through hole 13 are all coaxially arranged. This coaxial arrangement ensures that the tensile force being tested can be transmitted along the axis of the clamp during the tensile load test, thereby improving the stability of the test.

[0040] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.

Claims

1. A clamping device for bolt tensile load testing, characterized in that, It includes an inner clamp for connecting the two ends of the bolt to be tested and an outer clamp located outside the inner clamp; The outer wall of the inner clamp is provided with a limiting part; The outer clamp has a receiving cavity, one end of which has an inner clamp through hole, and the outer side wall of the outer clamp has a placement hole communicating with the receiving cavity. The outer clamp has a clamp connecting rod at the other end away from the inner clamp through hole. The inner clamp can enter the receiving cavity through the placement hole and extend into the inner clamp through hole, and the limiting part can be limited and fixed with the inner wall of the receiving cavity.

2. The clamping device as described in claim 1, characterized in that, The limiting part is provided along the outer wall of the inner clamp, and the limiting part and the outer wall of the inner clamp have a stepped structure; A stepped portion is provided at the junction of the receiving cavity and the through hole of the inner clamp, and the limiting portion can be limited and fixed with the stepped portion.

3. The clamping device as described in claim 2, characterized in that, The placement hole has a clearance hole at one end near the inner clamp through hole, and the clearance hole communicates with the inner clamp through hole.

4. The clamping device as described in claim 3, characterized in that, The opening width of the placement hole is greater than or equal to the outer diameter of the limiting part, the diameter of the inner clamp through hole is equal to the outer diameter of the inner clamp, and the opening width of the clearance hole is less than the opening width of the placement hole.

5. The clamping device as described in claim 1, characterized in that, The inner clamp has a mounting cavity, and the bottom of the mounting cavity has a mounting through hole.

6. The clamping device as described in claim 5, characterized in that, The inner clamp located at the top of the bolt is the first inner clamp, and the inner clamp located at the bottom of the bolt is the second inner clamp; The first inner clamp has a limiting groove at the junction of the mounting cavity and the mounting through hole. The bottom end of the bolt passes through the mounting cavity and the mounting through hole in sequence, and the end of the bolt is fixed to the mounting cavity. The bottom end of the bolt passes through the mounting through hole and the mounting cavity of the second inner clamp in sequence, and a nut is threaded to the bottom of the bolt.

7. The clamping device as described in claim 6, characterized in that, The limiting grooves are symmetrically arranged on both sides of the mounting through hole, and the inner wall of the limiting grooves is an arc surface structure.

8. The clamping device as described in claim 6, characterized in that, The connecting rod, the inner clamp through hole, the mounting cavity, and the mounting through hole are all coaxially arranged.

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