A pull-out test fixture equipped with a clamping mechanism

Abstract

This utility model provides a pull-out testing fixture with a clamping mechanism, relating to the field of pull-out testing technology. It includes a base, with a rectangular seat fixed to the upper end of the base. Clamping blocks are movably mounted on the four inner walls of the rectangular seat. A driving assembly is located at the lower end of the rectangular seat. The driving assembly includes movably mounted connecting rods and connecting rings. The upper end of each connecting rod is integrally formed with the lower end of a clamping block. The four connecting rods are sleeved with the connecting rings. Each connecting rod has a ramp on its outer surface, and the ramp abuts against the inner wall of the connecting ring. This utility model uses an electric telescopic rod to flexibly raise and lower the connecting rings. After the connecting rings move upwards, they slide from the lower end of the ramp to the upper end, causing each connecting rod to simultaneously move towards the axis of the rectangular seat. This allows the connecting rods to drive each clamping block to move synchronously, clamping the material simultaneously, ensuring uniform force on the material, simplifying the operation process, and improving testing efficiency.

Description

Technical Field

[0001] This utility model relates to the field of pull-out testing technology, and specifically to a pull-out testing fixture equipped with a clamping mechanism. Background Technology

[0002] Tensile strength is the maximum ability of a material to resist tensile failure and is one of the important mechanical properties of materials. Pull-out tests subject a material to axial tensile force until it fractures, accurately determining the maximum tensile force the material can withstand, and thus calculating its tensile strength. This is crucial for determining whether a material can meet the strength requirements of an engineering structure under tensile loads. For example, steel bars used in construction and cables for bridges require clearly defined tensile strengths to ensure structural safety. During the testing process, a pull-out test fixture is used to clamp the material.

[0003] For example, prior art application number CN201922500942.7 relates to a clamping fixture and a pull-out testing device. The clamping fixture includes a mounting base and a clamping mechanism. The mounting base has an open cavity for mounting a workpiece to be clamped. The open cavity has at least three opposing inner walls, each of which has a threaded hole. The clamping mechanism includes a connecting shaft and a clamping block. The outer side wall of the connecting shaft has an external thread. The clamping block is rotatably connected to the end of the connecting shaft. The connecting shaft has a nut. The clamping mechanism consists of at least two sets, and all the clamping mechanisms are evenly spaced circumferentially to form a clamping cavity for clamping the workpiece to be clamped.

[0004] The existing technology described above, through practical use, mainly involves sequentially tightening each bolt to allow multiple clamping blocks to clamp the material for testing. However, only by sequentially tightening each bolt can multiple clamping blocks clamp the material, and the different displacements of each clamping block can easily cause uneven stress on the material. In addition, the operation is cumbersome and inefficient. Therefore, based on actual usage, we have improved the existing technology described above. Utility Model Content

[0005] To address the aforementioned problems, this utility model aims to provide a pull-out test fixture equipped with a clamping mechanism.

[0006] To achieve this technical objective, the present invention provides a pull-out test fixture with a clamping mechanism, comprising a base, a rectangular seat fixed to the upper end of the base, and clamping blocks movably disposed on the four inner walls of the rectangular seat; a driving assembly is disposed at the lower end of the rectangular seat; the driving assembly comprises movably disposed connecting rods and connecting rings, the upper end of each connecting rod being integrally disposed with the lower end of the clamping block, the four connecting rods being sleeved with the connecting rings, and the outer surface of each connecting rod being provided with a ramp that abuts against the inner wall of the connecting ring.

[0007] Preferably, the upper end of the base is fixed to the lower surface of the rectangular base by a fixing rod, and an electric telescopic rod is fixed to the upper surface of the base by bolts. The output end of the electric telescopic rod is fixed to a crossbar by a mounting bracket. One end of the crossbar is welded to the outer surface of the connecting ring to drive the connecting ring to rise and fall.

[0008] Preferably, each of the four seats of the rectangular seat is provided with an elastic element, the elastic element including a slide rod and a spring; each of the four seats of the rectangular seat is provided with a slide rod, and one end of each slide rod is welded to a clamping block, and a circular block is welded to one end of each slide rod.

[0009] Preferably, a spring is fitted onto the outer surface of the slide rod, with one end of the spring welded to the outer surface of the rectangular base and the other end of the spring welded to the circular block.

[0010] Preferably, a pressure sensor is fixed to the inner side of each of the clamping blocks;

[0011] Beneficial effects:

[0012] 1. In use, the material is first placed between multiple clamping blocks. Then, the electric telescopic rod in the drive assembly is activated to drive the crossbar and connecting ring to rise and fall flexibly. After the connecting ring moves up, it slides from the lower end of the ramp to the upper end, causing each connecting rod to move towards the axis of the rectangular base at the same time. In this way, the connecting rod drives each clamping block to move synchronously and clamp the material synchronously, which can ensure that the material is subjected to uniform force. At the same time, multiple clamping blocks can move synchronously through the moving connecting ring, simplifying the operation process and thus improving the efficiency of material pull-out detection.

[0013] 2. When the clamping block moves inward, it will pull the slide rod to compress the spring. In this way, when the connecting ring moves down and does not actively press against the ramp, the spring will drive the clamping block back into place, which will facilitate the placement of materials for the next test.

[0014] 3. At the same time, the pressure sensor can display the pressure applied to the material by each clamping block in real time, so that the operator can adjust the clamping force to the optimal value according to the material characteristics and test requirements, which can ensure that the material does not slip during the test and avoid damage to the material due to excessive clamping force, thus affecting the test results. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a front view schematic diagram of the present invention;

[0017] Figure 3 This is a schematic diagram of the drive component of this utility model;

[0018] Figure 4This is a schematic diagram of the elastic component of this utility model;

[0019] Figure 5 This utility model Figure 1 Enlarged schematic diagram of point a in the middle.

[0020] The components include: 1. Base; 2. Rectangular base; 3. Clamping block; 4. Drive assembly; 41. Connecting rod; 42. Connecting ring; 43. Ramp; 44. Electric telescopic rod; 45. Crossbar; 5. Elastic component; 51. Slide rod; 52. Spring; 53. Circular block; and 6. Pressure sensor. Detailed Implementation

[0021] The utility model of this application will be further described in detail below with reference to the accompanying drawings and specific embodiments. In order to provide a clear and complete description of the technical solution, the following embodiments are selected for illustration; other embodiments obtained based on the content described in this application without creative effort are all within the scope of protection of this utility model.

[0022] In the following embodiments, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "top / bottom" and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the purpose of clearly describing this embodiment, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, and therefore should not be construed as a limitation of this application.

[0023] like Figures 1 to 5 As shown, this embodiment of the invention provides a pull-out test fixture with a clamping mechanism, including a base 1, a rectangular seat 2 fixed to the upper end of the base 1, and clamping blocks 3 movably disposed on the four inner walls of the rectangular seat 2. A driving assembly 4 is disposed at the lower end of the rectangular seat 2. The driving assembly 4 includes movably disposed connecting rods 41 and connecting rings 42. The upper end of each connecting rod 41 is integrally disposed with the lower end of the clamping block 3. The four connecting rods 41 and the connecting rings 42 are sleeved together. The outer surface of each connecting rod 41 is provided with a slope 43, and the slope 43 abuts against the inner wall of the connecting ring 42. The angle of the slope 43 is 30-70 degrees, and the higher part of the slope 43 faces outward and the lower part faces inward.

[0024] refer to Figure 1 and Figure 3 The upper end of the base 1 is fixed to the lower surface of the rectangular base 2 by a fixing rod. An electric telescopic rod 44 is fixed to the upper surface of the base 1 by bolts, and a crossbar 45 is fixed to the output end of the electric telescopic rod 44 by a mounting bracket. One end of the crossbar 45 is welded to the outer surface of the connecting ring 42 to drive the connecting ring 42 to rise and fall. The connecting rod 41 and the connecting ring 42 are made of metal steel. The inner wall of the connecting ring 42 is smooth to reduce wear with the ramp 43.

[0025] refer to Figure 4Each of the four seats of the rectangular base 2 is provided with an elastic element 5, which includes a slide rod 51 and a spring 52. Each of the four seats of the rectangular base 2 has a slide rod 51 inserted through it, and one end of each slide rod 51 is welded to the clamping block 3. A circular block 53 is welded to one end of each slide rod 51. A spring 52 is fitted on the outer surface of the slide rod 51, and one end of the spring 52 is welded to the outer surface of the rectangular base 2. The other end of the spring 52 is welded to the circular block 53. When the slide rod 51 slides inward, it will cause the circular block 53 to apply pressure to the spring 52.

[0026] refer to Figure 1 Each clamping block 3 has a pressure sensor 6 fixed to its inner side. First, it's crucial to determine the range of clamping force applied by the clamping block 3 to the material during the material pull-out test. The clamping force varies significantly depending on the material and test requirements. For example, softer materials require relatively less clamping force, while high-strength metals may require a larger clamping force to prevent slippage during the pull-out process. Therefore, the range of the pressure sensor 6 should be selected based on the maximum possible clamping force. Generally, the range should be slightly larger than the maximum expected clamping force to ensure the pressure sensor 6 is not damaged by overload while maintaining measurement accuracy. A certain margin should be allowed: Considering potential unforeseen circumstances during testing, such as operational errors leading to a sudden increase in clamping force, a certain margin should be allowed in the range, typically around 10%-20%.

[0027] Working principle: In use, the material is first placed between multiple clamping blocks 3. Then, by activating the electric telescopic rod 44 in the drive assembly 4, the crossbar 45 and the connecting ring 42 are flexibly raised and lowered. After the connecting ring 42 moves upward, it slides from the lower end of the ramp 43 to the upper end of the ramp 43, causing each connecting rod 41 to move towards the axis of the rectangular seat 2 at the same time. In this way, the connecting rod 41 drives each clamping block 3 to move synchronously and clamp the material synchronously, which can ensure that the material is subjected to uniform force. At the same time, multiple clamping blocks 3 can move synchronously through the moving connecting ring 42, simplifying the operation process and thus improving the efficiency of material pull-out detection.

[0028] When the clamping block 3 moves inward, it will pull the slide bar 51 to compress the spring 52. In this way, when the connecting ring 42 moves down and does not actively press against the ramp 43, the spring 52 will drive the clamping block 3 to return to its position, which will facilitate the placement of materials for the next test.

[0029] Meanwhile, the pressure sensor 6 can display the pressure applied to the material by each clamping block 3 in real time, so that the operator can adjust the clamping force to the optimal value according to the material characteristics and test requirements, so as to ensure that the material does not slip during the test and avoid damage to the material due to excessive clamping force, which would affect the test results.

[0030] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any minor modifications, equivalent substitutions and improvements made to the above embodiments based on the technical essence of the present utility model should be included within the protection scope of the technical solution of the present utility model.

Claims

1. A tensile testing fixture provided with a clamping mechanism, comprising a base (1), the upper end of the base (1) is fixed with a rectangular seat (2), and the four inner walls of the rectangular seat (2) are movably provided with clamping blocks (3), characterized in that: The lower end of the rectangular base (2) is provided with a driving component (4); The drive assembly (4) includes a movable connecting rod (41) and a connecting ring (42). The upper end of each connecting rod (41) is integrally set with the lower end of the clamping block (3). The four connecting rods (41) and the connecting ring (42) are sleeved together. The outer surface of each connecting rod (41) is provided with a ramp (43) and the ramp (43) abuts against the inner wall of the connecting ring (42).

2. The pull-out testing fixture with a clamping mechanism according to claim 1, characterized in that: The upper end of the base (1) is fixed to the lower surface of the rectangular base (2) by a fixing rod. An electric telescopic rod (44) is fixed to the upper surface of the base (1) by bolts, and a crossbar (45) is fixed to the output end of the electric telescopic rod (44) by a mounting bracket. One end of the crossbar (45) is welded to the outer surface of the connecting ring (42) to drive the connecting ring (42) to rise and fall.

3. The pull-out testing fixture with a clamping mechanism according to claim 2, characterized in that: The rectangular base (2) is provided with elastic elements (5) in each of its four seats. The elastic elements (5) include a slide rod (51) and a spring (52). Each of the four seats of the rectangular seat (2) is equipped with a slide rod (51), and one end of each slide rod (51) is welded to the clamping block (3). A circular block (53) is welded to one end of each slide rod (51).

4. The pull-out test fixture with a clamping mechanism according to claim 3, characterized in that: A spring (52) is fitted on the outer surface of the slide bar (51), and one end of the spring (52) is welded to the outer surface of the rectangular seat (2), while the other end of the spring (52) is welded to the circular block (53).

5. The pull-out testing fixture with a clamping mechanism according to claim 1 or 2, characterized in that: A pressure sensor (6) is fixed to the inside of each clamping block (3).

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