Device for testing compressive property of steel pipe

Abstract

The utility model relates to the technical field of testing devices, and discloses a steel pipe compression resistance testing device which comprises a testing table, a steel pipe arranged on the top surface of the testing table and a compression resistance testing assembly used for carrying out compression resistance testing on the steel pipe, and the compression resistance testing assembly is arranged on the top surface of the testing table. Through the mutual cooperative use of the test table, the steel pipe, the moving pipe, the fixed plate, the first hydraulic cylinder, the first moving plate and the first clamping plate, the effect of testing the compression resistance of the steel pipe can be achieved, and the first clamping plate applies pressure to the two sides of the steel pipe; the upper portions of the left side and the right side of a steel pipe are pressed downwards through a rotating second clamping plate, deviation caused by insufficient transverse fixing of the steel pipe in the detection process is avoided, the fixing effect on the steel pipe is guaranteed, meanwhile, supporting on the steel pipe can be canceled by starting a third hydraulic cylinder to push a moving table to move upwards, a bending resistance test can be conducted, and the device is practical.

Description

A device for testing the compressive strength of steel pipes Technical Field

[0001] This utility model relates to the field of testing device technology, and in particular to a testing device for the compressive strength of steel pipes. Background Technology

[0002] Compressive strength testing of steel pipes evaluates their performance under external pressure, ensuring their safety and reliability in practical applications. Compressive strength refers to the ultimate strength under applied external force. Bending strength testing is a method for evaluating the performance of materials under bending loads, primarily used to understand the material's elasticity, strength, and durability. By applying gradually increasing bending force until the sample breaks or deforms, relevant data are recorded to analyze material properties. To understand the characteristics of steel pipes and their suitability for engineering applications, mechanical strength tests must first be performed. Strength tests mainly include compressive strength and bending strength tests; the main difference lies in whether the bottom of the steel pipe is fully supported. With societal development, the demand for such compressive strength testing equipment for steel pipes is increasing daily.

[0003] An existing steel tube compression testing device (notification number: CN211453147U) used in vehicle frame production has at least the following drawbacks:

[0004] In the aforementioned patent, the steel pipe is fixed by tightening the bolts and using the curved clips to clamp and lock it. However, the steel pipe can only be fixed by pressing down, and the steel pipe lacks lateral restraint. In addition, the device can only perform pressure resistance testing on the steel pipe. When there is a need for bending resistance testing, the machine needs to be replaced, which is inconvenient to use and has certain limitations. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a steel pipe compressive strength testing device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A steel pipe compressive strength testing device includes a test platform with a steel pipe mounted on its top surface. It also includes a compressive strength testing assembly for testing the steel pipe's compressive strength. The assembly is located on the top surface of the test platform and includes two movable tubes, both fixedly mounted on the top surface of the test platform. Two first movable plates are movably fitted inside each movable tube. A first clamping plate is fixedly mounted on the top surface of each first movable plate. Fixed plates are fixedly mounted on both sides of each movable tube. A first circular through hole is formed on one side of each fixed plate. A first hydraulic cylinder is fixedly sleeved on the inner wall of the first circular through hole. One end of the telescopic shaft of the first hydraulic cylinder is fixedly installed with the first moving plate. A rotating plate is movably sleeved inside the first clamping plate. Rotating columns are fixedly installed on both sides of the rotating plate. A second circular through hole is opened on both sides of the first clamping plate. The inner wall of the second circular through hole is movably sleeved with the rotating column. A fixing hole is opened on the outer wall of the rotating plate. A second hydraulic cylinder is fixedly sleeved on the inner wall of the fixing hole. A second clamping plate is fixedly installed on the bottom surface of the telescopic shaft of the second hydraulic cylinder.

[0008] As a further embodiment of this utility model, a support frame is fixedly sleeved on the outside of the test platform. A fourth circular through hole is opened on the top surface of the support frame. A fourth hydraulic cylinder is fixedly sleeved on the inner circular wall of the fourth circular through hole. A second moving plate is fixedly installed on the bottom surface of the telescopic shaft of the fourth hydraulic cylinder. A pressure detector is fixedly installed on the bottom surface of the second moving plate. A lower pressure plate is fixedly installed on the bottom surface of the pressure detector. The pressure detector is electrically connected to the PLC controller.

[0009] As a further embodiment of this utility model, the outer circular wall of the rotating plate is provided with two first limiting holes, and the inner circular wall of the first limiting hole is movably sleeved with a second limiting post, and the second limiting post is fixedly installed with the second clamping plate.

[0010] As a further embodiment of this utility model, the top surface of the test platform is provided with a rectangular groove, the bottom surface of the rectangular groove is provided with a third circular through hole, the inner circular wall of the third circular through hole is fixedly sleeved with a third hydraulic cylinder, and the top surface of the telescopic shaft of the third hydraulic cylinder is fixedly installed with a moving platform.

[0011] As a further embodiment of this utility model, a plurality of first limiting posts are fixedly installed on the bottom surface of the mobile platform, and a plurality of limiting grooves are opened on the inner bottom surface of the rectangular groove, the limiting grooves being movably connected to the first limiting posts.

[0012] As a further embodiment of this utility model, the top surface of the second movable plate is provided with two second limiting holes, which are movably connected to the support frame.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] By using the test platform, steel pipe, moving pipe, fixed plate, first hydraulic cylinder, first moving plate, and first clamping plate in coordination, the compressive strength test of the steel pipe can be achieved. The first clamping plate applies pressure to both sides of the steel pipe, while the rotating second clamping plate presses down on the upper left and right sides of the steel pipe, preventing the steel pipe from shifting during the test due to insufficient lateral fixation. This multi-directional limitation of the steel pipe ensures its fixation. At the same time, by activating the third hydraulic cylinder to push the moving platform upward, the support for the steel pipe can be removed, allowing for bending resistance testing. This method is quite practical. Attached Figure Description

[0015] Figure 1 is a schematic diagram of the overall structure of a steel pipe compressive strength testing device proposed in this utility model;

[0016] Figure 2 is a schematic diagram of the test bench structure of a steel pipe compressive strength testing device proposed in this utility model.

[0017] Figure 3 is a partial structural diagram of A in Figure 2;

[0018] Figure 4 is a schematic diagram of the limiting groove structure of a steel pipe compressive strength testing device proposed in this utility model.

[0019] In the diagram: 1. Test bench; 2. Steel pipe; 3. Moving pipe; 4. Fixed plate; 5. First hydraulic cylinder; 6. First moving plate; 7. First clamping plate; 8. Rotating plate; 9. Fixed hole; 10. Second clamping plate; 11. Second hydraulic cylinder; 12. First limiting hole; 13. Rotating column; 14. Third hydraulic cylinder; 15. Moving table; 16. Limiting groove; 17. First limiting column; 18. Support frame; 19. Fourth hydraulic cylinder; 20. Second moving plate; 21. Pressure detector; 22. Lower pressure plate; 23. Second limiting hole; 24. Second limiting column. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0021] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] Referring to Figures 1-4, a steel pipe compressive strength testing device includes a test platform 1, on the top surface of which a steel pipe 2 is mounted. The device also includes a compressive strength testing assembly for testing the compressive strength of the steel pipe 2. The assembly comprises two movable tubes 3, both fixedly mounted on the top surface of the test platform 1. Two first movable plates 6 are movably sleeved inside each movable tube 3. A first clamping plate 7 is fixedly mounted on the top surface of each first movable plate 6. Fixed plates 4 are fixedly mounted on both sides of each movable tube 3. A first circular through hole is provided on one side of each fixed plate 4. A first hydraulic cylinder 5 is fixedly sleeved on the inner wall of the first circular through hole. One end of the telescopic shaft of the first hydraulic cylinder 5 is fixedly installed with the first moving plate 6. A rotating plate 8 is movably sleeved inside the first clamping plate 7. Rotating columns 13 are fixedly installed on both sides of the rotating plate 8. A second circular through hole is opened on both sides of the first clamping plate 7. The inner wall of the second circular through hole is movably sleeved with the rotating column 13. A fixing hole 9 is opened on the outer wall of the rotating plate 8. A second hydraulic cylinder 11 is fixedly sleeved on the inner wall of the fixing hole 9. A second clamping plate 10 is fixedly installed on the bottom surface of the telescopic shaft of the second hydraulic cylinder 11.

[0024] In this embodiment, a support frame 18 is fixedly sleeved on the outside of the test bench 1. A fourth circular through hole is opened on the top surface of the support frame 18. A fourth hydraulic cylinder 19 is fixedly sleeved on the inner circular wall of the fourth circular through hole. A second moving plate 20 is fixedly installed on the bottom surface of the telescopic shaft of the fourth hydraulic cylinder 19. A pressure detector 21 is fixedly installed on the bottom surface of the second moving plate 20. A lower pressure plate 22 is fixedly installed on the bottom surface of the pressure detector 21. The pressure detector 21 is electrically connected to the PLC controller. Two first limiting holes 12 are opened on the outer circular wall of the rotating plate 8. A second limiting post 24 is movably sleeved on the inner circular wall of the first limiting hole 12. The second limiting post 24 is fixedly installed with the second clamping plate 10. A rectangular groove is opened on the top surface of the test bench 1. A third circular through hole is opened on the bottom surface of the rectangular groove. A third hydraulic cylinder 14 is fixedly sleeved on the inner circular wall of the third circular through hole. A moving stage 15 is fixedly installed on the top surface of the telescopic shaft of the third hydraulic cylinder 14. Several first limiting posts 17 are fixedly installed on the bottom surface of the movable platform 15, and several limiting grooves 16 are opened on the inner bottom surface of the rectangular groove. The limiting grooves 16 are movably sleeved with the first limiting posts 17. Two second limiting holes 23 are opened on the top surface of the second movable plate 20. The second limiting holes 23 are movably sleeved with the support frame 18.

[0025] From the above description, it can be seen that the above embodiments of this utility model achieve the following technical effects: When the user needs to perform a pressure test on the steel pipe 2, the user picks up the steel pipe 2 and places it between the top surface of the moving pipe 3 and the two first clamping plates 7. Then, the two first hydraulic cylinders 5 are activated to push the first moving plate 6 to move, causing the first clamping plates 7 to move towards each other, thus squeezing the steel pipe 2. Then, the second hydraulic cylinder 11 is activated to push the second clamping plate 10 to move, and the second hydraulic cylinder 11 is rotated around the rotating column 13, so that the second clamping plate 10 faces the outer wall of the steel pipe 2. The second hydraulic cylinder 11 pushes the two second clamping plates 10 to move, squeezing the outer wall of the steel pipe 2, thus allowing downward pressure and limiting on the left and right sides of the steel pipe 2, limiting the steel pipe 2 in multiple directions, ensuring the fixing effect of the steel pipe 2. Afterwards, the fourth hydraulic cylinder 19 is activated to push the second moving plate 20 downward. The movement of the pressure detector 21 and the lower pressure plate 22 causes them to move downwards, thereby pressing down on the steel pipe 2 through the lower pressure plate 22 to perform a compressive strength test on the steel pipe 2. The pressure detector 21 detects the downward pressure. At the same time, the third hydraulic cylinder 14 is activated to move the moving platform 15 downwards, so that the moving platform 15 no longer supports the bottom of the steel pipe 2, allowing for a bending resistance test on the steel pipe 2 to be performed, thus testing the bending resistance effect of the steel pipe 2. This achieves the comprehensive effect of testing the compressive strength performance of the steel pipe 2. The first clamping plate 7 applies pressure to both sides of the steel pipe 2, and the rotating second clamping plate 10 presses down on the upper left and right sides of the steel pipe 2, limiting the steel pipe in multiple directions and preventing the steel pipe 2 from shifting during the test due to insufficient lateral fixation, thus ensuring the fixation effect of the steel pipe 2. At the same time, by activating the third hydraulic cylinder 14 to push the moving platform 15 upwards, the support for the steel pipe 2 can be removed, allowing for a bending resistance test, which is quite practical.

[0026] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A steel pipe compressive strength testing device, comprising a testing platform (1), wherein a steel pipe (2) is disposed on the top surface of the testing platform (1), characterized in that, It also includes a compressive strength testing assembly for performing a compressive strength test on the steel pipe (2). The compressive strength testing assembly is disposed on the top surface of the test bench (1). The compressive strength testing assembly includes: two movable pipes (3), both of which are fixedly installed on the top surface of the test bench (1). Two first movable plates (6) are movably sleeved inside the movable pipes (3). A first clamping plate (7) is fixedly installed on the top surface of the first movable plate (6). Fixed plates (4) are fixedly installed on both sides of the movable pipes (3). A first circular through hole is opened on one side of the fixed plate (4). A first hydraulic cylinder (5) is fixedly sleeved on the inner circular wall of the first circular through hole. One end of the telescopic shaft of the first hydraulic cylinder (5) is fixedly installed with the first moving plate (6). The first clamping plate (7) is movably sleeved with a rotating plate (8). Rotating columns (13) are fixedly installed on both sides of the rotating plate (8). The first clamping plate (7) has a second circular through hole on both sides. The inner wall of the second circular through hole is movably sleeved with the rotating column (13). The outer wall of the rotating plate (8) has a fixing hole (9). The inner wall of the fixing hole (9) is fixedly sleeved with a second hydraulic cylinder (11). The bottom surface of the telescopic shaft of the second hydraulic cylinder (11) is fixedly installed with a second clamping plate (10).

2. The device for testing the compressive resistance of a steel pipe according to claim 1, wherein The test bench (1) is externally fixedly fitted with a support frame (18). The top surface of the support frame (18) is provided with a fourth circular through hole. The inner wall of the fourth circular through hole is fixedly fitted with a fourth hydraulic cylinder (19). The bottom surface of the telescopic shaft of the fourth hydraulic cylinder (19) is fixedly installed with a second moving plate (20). The bottom surface of the second moving plate (20) is fixedly installed with a pressure detector (21). The bottom surface of the pressure detector (21) is fixedly installed with a lower pressure plate (22). The pressure detector (21) is electrically connected to the PLC controller.

3. The device for testing the compressive resistance of a steel pipe according to claim 1, wherein The outer circular wall of the rotating plate (8) has two first limiting holes (12), and the inner circular wall of the first limiting hole (12) is movably sleeved with a second limiting post (24), and the second limiting post (24) is fixedly installed with the second clamping plate (10).

4. The device for testing the compressive resistance of a steel pipe according to claim 1, wherein The test bench (1) has a rectangular groove on its top surface and a third circular through hole on the bottom surface of the rectangular groove. A third hydraulic cylinder (14) is fixedly sleeved on the inner wall of the third circular through hole, and a moving platform (15) is fixedly installed on the top surface of the telescopic shaft of the third hydraulic cylinder (14).

5. The device for testing the compressive resistance of a steel pipe according to claim 4, wherein The bottom surface of the mobile platform (15) is fixedly equipped with several first limiting posts (17), and the bottom surface of the rectangular groove is provided with several limiting grooves (16), which are movably connected to the first limiting posts (17).

6. The steel pipe compressive strength testing device according to claim 2, characterized in that, The top surface of the second movable plate (20) has two second limiting holes (23), which are movably connected to the support frame (18).

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