Tensile property testing device for column production

Abstract

This invention discloses a tensile performance testing device for column production, specifically relating to the field of column tensile testing technology. It includes a sleeve block, a sliding sleeve block, a stable test piece, and a moving block. The sliding sleeve block is fixed to the bottom end of the sleeve block; the stable test piece is mounted on the sliding sleeve block, and a moving block is located on one side of the sleeve block, with the stable test piece and the moving block connected. This invention employs a long grooved rod, a medium grooved rod, and a short grooved rod in conjunction with a stepped separator and a stepped power component. An electric cylinder drives a slider to sequentially separate the long grooved rod, the medium grooved rod, and the short grooved rod via a linkage bar and multiple diverter blocks, achieving a multi-step fluctuating impact tensile condition. This accurately reproduces the transient impact response of the column, and intelligent sensors are used to assess the column's tensile impact resistance. The device has a wider testing applicability, thus solving the problems of accurately reproducing the transient impact response of a column under actual stress and the difficulty in using intelligent sensors to assess the column's tensile impact resistance, which previously had a narrower testing scope.

Description

Technical Field

[0001] This invention relates to the field of column tensile testing technology, and more specifically, to a tensile performance testing device for column production. Background Technology

[0002] In the production of galvanized guardrail posts, tensile performance testing equipment is crucial for quality control. By applying axial tensile force, it accurately measures the key mechanical parameters of the post material, such as tensile strength, yield strength, and elongation at break, ensuring that the steel meets performance standards after cold bending. It can also quickly verify the reliability of the bond between the galvanized layer and the substrate, preventing guardrail failure under impact due to process deviations.

[0003] Patent publication number CN103512801A discloses a tensile force sensor technical solution. This solution employs a notch at the other end of the mounting portion, located along the extension of the force-measuring portion's length direction. The notch communicates with a groove, and the width of the notch is smaller than the width of the groove. The specimen extends out of the mounting portion through the notch. The tensile force sensor also includes a cover plate disposed above the groove, which is tightly and fixedly connected to the mounting portion by multiple fasteners. The tensile force sensor of this invention is small in size, simple in structure, low in cost, and has good testing results; however, it has the following problems.

[0004] During the production of galvanized guardrail posts, tensile performance tests are required to verify their mechanical strength. However, existing tests often use pressure sensors to measure force values. This method is difficult to accurately simulate the fluctuating impact tensile conditions of stepped forces after reaching a specified tensile force, and it is difficult to truly reproduce the transient impact response of the post under actual stress. This results in a large deviation between the critical impact tensile test results of galvanized guardrail posts and actual working conditions, making it difficult to use smart sensors to assess the tensile impact resistance of the posts and limiting the applicability of the tests. Summary of the Invention

[0005] To address the aforementioned problems in the prior art, the present invention provides the following technical solution: a tensile performance testing device for column production, comprising a sleeve block, wherein a sliding sleeve block is fixed at the bottom end of the sleeve block;

[0006] A stability test piece is mounted on a sliding block, and a moving block is provided on one side of the sliding block. The stability test piece is connected to the moving block.

[0007] The long groove rod, the medium groove rod, and the short groove rod all slide on the inner wall of the sleeve block. The length of the long groove rod is greater than the length of the medium groove rod, and the length of the medium groove rod is greater than the length of the short groove rod.

[0008] A stepped separator is installed on the outer wall of the long grooved rod;

[0009] A stepped power component is located at one end of the sleeve block;

[0010] The stability test piece is configured to drive the sliding block to move the sleeve block, and simultaneously drive the moving block to move synchronously, so as to perform a stability intelligent sensing tensile test on the column.

[0011] The stepped separator is configured such that when the column reaches a specified stable tensile force during the test, the long groove rod is separated first, then the middle groove rod is separated, and finally the short groove rod is separated.

[0012] The stepped power component is configured to: drive the long grooved rod to impact the moving block first, then drive the middle grooved rod to impact the moving block, and finally drive the short grooved rod to impact the moving block.

[0013] In a preferred embodiment, the stability test piece includes:

[0014] A screw is threadedly connected to the inner wall of the sliding sleeve block, and an outer seat is connected to the outer wall of the sliding sleeve block. The outer seat is used to guide the sliding of the sliding sleeve block.

[0015] Two guide rods are located on both sides of the sliding block, and the guide rods are used to guide the sliding block to slide. The guide rods are fixedly connected to the outer seat.

[0016] A geared motor is mounted at one end of the outer casing, and the geared motor is used to drive the screw to rotate.

[0017] The movable sleeve slides on the upper surface of the outer seat, and one side of the movable sleeve is provided with a fixed sleeve that is fixedly connected to the outer seat;

[0018] A frame block is fixed to the outer wall of the movable sleeve. A protruding rod is fixedly connected to one side of the frame block, and the protruding rod is slidably connected to the sliding sleeve block.

[0019] A linkage block is connected to one end of a protruding rod, and both the protruding rod and the moving block are fixedly connected to the linkage block;

[0020] The first pressure sensor is located above the protruding rod. The first pressure sensor is fixedly connected to the sliding block, and the sensing end of the first pressure sensor abuts against the linkage block.

[0021] The second pressure sensor is installed at one end of the linkage block. A bracket is connected to one end of the second pressure sensor. Both the sliding block and the second pressure sensor are fixedly connected to the bracket. The sensing end of the second pressure sensor abuts against the linkage block.

[0022] In a preferred embodiment, a gap is provided between the fixed sleeve and the movable sleeve, and the upper surface of the fixed sleeve and the upper surface of the movable sleeve are at the same horizontal plane.

[0023] In a preferred embodiment, threaded bolts are embedded in the inner walls of both the movable sleeve and the fixed sleeve, and the bolts are used to press and lock the column.

[0024] In a preferred embodiment, a controller is provided on one side of the outer seat, and both the second pressure sensor and the first pressure sensor are electrically connected to the controller.

[0025] In a preferred embodiment, the stepped power component includes:

[0026] A cavity sleeve is fixedly connected to one end of the sleeve block, and the long groove rod, the middle groove rod, and the short groove rod are all slidably connected to the cavity sleeve.

[0027] A shunt tube is connected to one side of the outer wall of the cavity sleeve. A valve is fixedly connected to the outer wall of the shunt tube. An air pressure sensor for measuring air pressure is embedded at the top of the shunt tube.

[0028] Multiple pistons slide on the inner wall of the cavity sleeve, and the multiple pistons are fixedly connected to the long groove rod, the middle groove rod and the short groove rod respectively;

[0029] Each piston has a limiting rod on one side that abuts against it, and the limiting rod is fixedly connected to the cavity sleeve.

[0030] In a preferred embodiment, the plurality of pistons and the plurality of limiting rods are arranged sequentially from top to bottom.

[0031] In a preferred embodiment, a gap is provided between the piston and one side of the inner wall of the cavity sleeve, and the long groove rod, the middle groove rod, and the short groove rod are arranged sequentially from top to bottom.

[0032] In a preferred embodiment, the stepped separator includes:

[0033] Multiple diversion blocks are disposed on one side of the outer wall of the long groove rod, and the length of the multiple diversion blocks increases sequentially from top to bottom;

[0034] A linkage bar is provided at one end of the diversion block, and multiple diversion blocks are fixedly connected to the linkage bar;

[0035] A slider is fixed to the top of the linkage bar. The slider is slidably connected to the sleeve block. An electric cylinder is provided on one side of the slider. The outer wall of the electric cylinder is fixedly connected to the sleeve block. The electric cylinder is used to push the slider to move.

[0036] The technical effects and advantages of the present invention.

[0037] This invention employs long, medium, and short grooved rods in conjunction with stepped separators and stepped power components. After the column is stably stretched to a specified force value, an electric cylinder drives a slider to sequentially separate the long, medium, and short grooved rods along with a linkage bar and multiple diverter blocks. Then, multiple pistons within the cavity impact the moving block sequentially under air pressure, achieving a multi-step fluctuating impact stretching condition. This accurately reproduces the column's transient impact response, resulting in a smaller deviation between the test results and actual working conditions. The invention utilizes intelligent sensors, including a first pressure sensor, a second pressure sensor, and an air pressure sensor, to assess the column's tensile impact resistance, thus broadening the testing applicability.

[0038] 2. This invention uses a cavity sleeve connecting the diversion pipe and valve, and an air pressure sensor to monitor the air pressure in real time. Multiple pistons and limit rods are arranged to allow the long groove rod, the middle groove rod, and the short groove rod to release impact kinetic energy in sequence under the drive of pressurized air. The magnitude of the stepped impact force can be precisely controlled by the air pressure, realizing the accurate testing of the column's tensile impact resistance performance by intelligent sensors. The testing range is not only wider, but also more stable and accurate. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the main structure of the tensile performance testing device for column production according to the present invention.

[0040] Figure 2 This is a schematic diagram of the vertical cross-section structure of the tensile performance testing device for column production according to the present invention.

[0041] Figure 3 This is a bottom view of the cross-section of the tensile performance testing device for column production according to the present invention.

[0042] Figure 4 This is a partial structural diagram of the connection between the protruding rod and the linkage block of the present invention.

[0043] Figure 5 This is a partial structural diagram of the connection between the protruding rod and the frame block in this invention.

[0044] Figure 6 This is a schematic diagram of the structure of the present invention.

[0045] Figure 7 This is a partial structural diagram of the vertical cross-section at the connection between the sleeve block and the cavity sleeve of the present invention.

[0046] Figure 8 This is a partial structural diagram of the vertical cross-section of the long groove rod, the medium groove rod, and the short groove rod of the present invention.

[0047] The attached figures are labeled as follows: 1. Sleeve block; 2. Moving block; 3. Long grooved rod; 4. Middle grooved rod; 5. Short grooved rod; 6. Sliding sleeve block; 7. Screw; 8. Outer seat; 9. Guide rod; 10. Gear motor; 11. Movable sleeve; 12. Fixed sleeve; 13. Frame block; 14. Protruding rod; 15. Linkage block; 16. First pressure sensor; 17. Second pressure sensor; 18. Bracket; 19. Bolt; 20. Controller; 21. Cavity sleeve; 22. Diverter pipe; 23. Valve; 24. Air pressure sensor; 25. Piston; 26. Limiting rod; 27. Diverter block; 28. Linkage bar; 29. ​​Slider; 30. Electric cylinder. Detailed Implementation

[0048] The technical solution of the present invention will be clearly and completely described below with reference to the figures and specific embodiments. Example 1:

[0049] In this embodiment, as Figure 1 The tensile performance testing device for column production shown includes a sleeve block 1, with a sliding block 6 fixed to the bottom end of the sleeve block 1; a stable test piece, set on the sliding block 6, with a moving block 2 on one side of the sleeve block 1, and the stable test piece connected to the moving block 2; a long grooved rod 3, a middle grooved rod 4, and a short grooved rod 5, all sliding on the inner wall of the sleeve block 1, with the length of the long grooved rod 3 being greater than the length of the middle grooved rod 4, and the length of the middle grooved rod 4 being greater than the length of the short grooved rod 5; a stepped separator, set on the outer wall of the long grooved rod 3; and a stepped power component, set at one end of the sleeve block 1.

[0050] In use, the outer seat 8 needs to be welded to the test platform. Keeping the outer seat 8 stationary, the stable test piece can drive the sliding block 6 to move the sleeve block 1, and simultaneously drive the moving block 2 to move synchronously, so as to perform a stable intelligent sensing tensile test on the column. When the column reaches the specified stable tensile force during the test, the stepped separation component first separates the long groove rod 3, then separates the middle groove rod 4, and finally separates the short groove rod 5. The stepped power component starts to drive the long groove rod 3 to impact the moving block 2, then drives the middle groove rod 4 to impact the moving block 2, and finally drives the short groove rod 5 to impact the moving block 2. When the column reaches the specified force in the stable tensile test, a multi-step impact test is performed. The critical impact tensile test results of the galvanized guardrail column are relatively close to the actual working conditions. By using intelligent sensors to test the tensile impact resistance of the column, the testing scope is wider. Example 2:

[0051] In this embodiment, as Figure 1 - Figure 5As shown, the stability test piece includes: a screw 7, threadedly connected to the inner wall of the sliding block 6, with an outer seat 8 connected to the outer wall of the sliding block 6, the outer seat 8 being used to guide the sliding block 6 to slide; two guide rods 9, located on both sides of the sliding block 6 respectively, the guide rods 9 being used to guide the sliding block 6 to slide, and the guide rods 9 being fixedly connected to the outer seat 8; a reduction motor 10, installed at one end of the outer seat 8, the reduction motor 10 being used to drive the screw 7 to rotate; and a movable sleeve 11, sliding on the upper surface of the outer seat 8, with a fixed sleeve 12 fixedly connected to the outer seat 8 on one side of the movable sleeve 11.

[0052] A frame block 13 is fixed to the outer wall of the movable sleeve 11. A protruding rod 14 is fixedly connected to one side of the frame block 13, and the protruding rod 14 is slidably connected to the sliding sleeve block 6. A linkage block 15 is connected to one end of the protruding rod 14, and both the protruding rod 14 and the movable block 2 are fixedly connected to the linkage block 15. A first pressure sensor 16 is disposed above the protruding rod 14, and the first pressure sensor 16 is fixedly connected to the sliding sleeve block 6. The sensing end of the first pressure sensor 16 abuts against the linkage block 15. A second pressure sensor 17 is installed at one end of the linkage block 15, and a bracket 18 is connected to one end of the second pressure sensor 17. Both the sliding sleeve block 6 and the second pressure sensor 17 are fixedly connected to the bracket 18, and the sensing end of the second pressure sensor 17 abuts against the linkage block 15. A gap is provided between the fixed sleeve 12 and the movable sleeve 11, and the upper surface of the fixed sleeve 12 and the upper surface of the movable sleeve 11 are at the same horizontal plane.

[0053] In this embodiment, as Figure 2 As shown, threaded bolts 19 are embedded in the inner walls of both the movable sleeve 11 and the fixed sleeve 12. The bolts 19 are used to press and lock the column.

[0054] In this embodiment, as Figure 1 As shown, a controller 20 is provided on one side of the outer seat 8. The second pressure sensor 17 and the first pressure sensor 16 are both electrically connected to the controller 20. In this way, the pressure values ​​of the second pressure sensor 17 and the first pressure sensor 16 can be displayed on the display screen built into the controller 20, and the controller 20 stores and records them.

[0055] In use, the column is placed on the inner walls of the fixed sleeve 12 and the movable sleeve 11. By rotating two bolts 19, one bolt 19 engages with the inner wall of the movable sleeve 11 and moves downwards, while the other bolt 19 engages with the inner wall of the fixed sleeve 12 and moves downwards. These two bolts 19 press against the upper surface of the column. The controller 20 starts the reduction motor 10, whose output drives the screw 7 to rotate. The screw 7 rotates on the inner wall of the outer seat 8, causing the sliding sleeve block 6 to move to the right under the force of the threaded engagement. Simultaneously, the sliding sleeve block 6 moves the first pressure sensor 16 to the right, and the sliding sleeve block 6 moves the bracket 18 to the right. The bracket 18 moves the second pressure sensor 17 to the right, and the sensing end of the first pressure sensor 16 presses against the connecting rod. Moving block 15 moves to the right, linkage block 15 drives sleeve block 1 to move to the right, and linkage block 15 drives protruding rod 14 to move to the right. Protruding rod 14 drives frame block 13 to move to the right. Frame block 13 drives movable sleeve 11 to move to the right. Movable sleeve 11 pulls the column. The other end of the column is supported and limited by outer seat 8. In this way, the column is subjected to a stable tensile test. At the same time, the sensing end of the first pressure sensor 16 is squeezed by linkage block 15. When the squeezing force value sensed by the first pressure sensor 16 is the same as the squeezing force set vertically by controller 20, the set critical test tensile force value is reached. The column is subjected to a stable tensile test until the specified force is reached. The bracket 18 is supported by sliding sleeve block 6. The bracket 18 supports the second pressure sensor 17. The second pressure sensor 17 senses the pressure on the right side of linkage block 15. Example 3:

[0056] In this embodiment, as Figure 6 - Figure 7 As shown, the stepped power component includes: a cavity sleeve 21, fixedly connected to one end of the sleeve block 1, with the long groove rod 3, the middle groove rod 4, and the short groove rod 5 all slidably connected to the cavity sleeve 21; a diverter pipe 22, connected and installed on one side of the outer wall of the cavity sleeve 21, with a valve 23 fixedly connected to the outer wall of the diverter pipe 22, and an air pressure sensor 24 for measuring air pressure embedded at the top of the diverter pipe 22; multiple pistons 25, all sliding on the inner wall of the cavity sleeve 21, with each piston 25 correspondingly and fixedly connected to the long groove rod 3, the middle groove rod 4, and the short groove rod 5; and a limiting rod 26 on one side of each piston 25, which is fixedly connected to the cavity sleeve 21. The multiple pistons 25 and the multiple limiting rods 26 are arranged sequentially from top to bottom. A gap is provided between the piston 25 and one side of the inner wall of the cavity sleeve 21, and the long groove rod 3, the middle groove rod 4, and the short groove rod 5 are arranged sequentially from top to bottom.

[0057] In the initial stamping stage, valve 23 is opened to inject pressurized air into it. The air is then injected into the distribution pipe 22 and into multiple cavities inside the sleeve 21. The pressure compresses the first piston 25, which in turn compresses the long grooved rod 3. Simultaneously, the limiting rod 26 creates a gap between the first piston 25 and one side of the inner wall of the sleeve 21. Under the pressure of the high-pressure air, the second piston 25 compresses the middle grooved rod 4, and the third piston 25 compresses the short grooved rod 5. Thus, the long grooved rod 3, the middle grooved rod 4, and the short grooved rod 5 are all subjected to high pressure. Example 4:

[0058] In this embodiment, as Figure 8 As shown, the stepped separator includes: multiple diversion blocks 27, which are disposed on one side of the outer wall of the long groove rod 3, and the length of the multiple diversion blocks 27 increases sequentially from top to bottom; a linkage bar 28, which is disposed at one end of the diversion blocks 27, and the multiple diversion blocks 27 are fixedly connected to the linkage bar 28; a slider 29, which is fixed to the top of the linkage bar 28, and the slider 29 is slidably connected to the sleeve block 1. An electric cylinder 30 is provided on one side of the slider 29, and the outer wall of the electric cylinder 30 is fixedly connected to the sleeve block 1. The electric cylinder 30 is used to push the slider 29 to move.

[0059] When this technology is used, the long groove rod 3, the middle groove rod 4, and the short groove rod 5 are all subjected to high pressure. At this time, the first diversion block 27 restricts the movement of the long groove rod 3, the second diversion block 27 restricts the movement of the middle groove rod 4, and the third diversion block 27 restricts the movement of the short groove rod 5.

[0060] When the sliding sleeve block 6 moves to the right, the sliding sleeve block 6 will simultaneously cause the sleeve block 1 to move to the right. The sleeve block 1 drives the cavity sleeve 21 to move, the cavity sleeve 21 drives the slider 29 to move to the right, the slider 29 causes the linkage bar 28 to move to the right, the linkage bar 28 drives multiple diverter blocks 27 to move to the right synchronously, and the long groove rod 3, the middle groove rod 4 and the short groove rod 5 also move to the right at the same time.

[0061] When the set critical test tensile force value is reached, the controller 20 starts the electric cylinder 30. The output end of the electric cylinder 30 pushes the slider 29 forward. The slider 29 slides forward along the sleeve block 1. At the same time, the slider 29 drives the linkage bar 28 forward. Since the length of the multiple diverting blocks 27 increases sequentially from top to bottom, the linkage bar 28 drives the first diverting block 27 forward. The first diverting block 27 separates from the long groove rod 3 first, then the second diverting block 27 separates from the middle groove rod 4, and finally the third diverting block 27 separates from the short groove rod 5.

[0062] The pressurized air compresses the first piston 25. Under pressure, piston 25 moves the long grooved rod 3 to the right, impacting the moving block 2. The moving block 2 then moves the linkage block 15 to the right, which in turn moves the protruding rod 14 to the right. Simultaneously, the sliding sleeve 6 remains stationary, guiding the protruding rod 14 to the right. The sliding sleeve 6 also supports the bracket 18, which in turn supports the second pressure sensor 17. The second pressure sensor 17 senses the initial impact pressure of the linkage block 15 and records it on the controller 20. Next, the air compresses the second piston 25, which moves the middle grooved rod 4 to the right. Rod 4 impacts the moving block 2 again, causing the moving block 2 to press against the sensing end of the second pressure sensor 17. The second pressure sensor 17 then senses the impact pressure of the linkage block 15 for the second time and records it on the controller 20. Finally, the short groove rod 5 impacts the moving block 2, causing the moving block 2 to move the linkage block 15 to the right. The linkage block 15 then presses against the sensing end of the second pressure sensor 17, and the second pressure sensor 17 senses the impact pressure of the linkage block 15 for the third time. When the long groove rod 3, the middle groove rod 4, and the short groove rod 5 reach the tensile critical value, they can perform impact tests with different forces in a stepped manner.

[0063] The above description is only a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Modifications, equivalent substitutions, etc., made within the scope of the technical solution of the present invention should all fall within the protection scope of the present invention.

Claims

1. A tensile performance testing device for column production, comprising a sleeve (1), characterized in that: The bottom end of the sleeve (1) is fixed with a sliding sleeve (6). A stability test piece is set on a sliding block (6), and a moving block (2) is provided on one side of the sliding block (1). The stability test piece is connected to the moving block (2). The long groove rod (3), the middle groove rod (4) and the short groove rod (5) all slide on the inner wall of the sleeve block (1). The length of the long groove rod (3) is greater than the length of the middle groove rod (4), and the length of the middle groove rod (4) is greater than the length of the short groove rod (5). A stepped separator is installed on the outer wall of the long groove rod (3); A stepped power component is installed at one end of the sleeve block (1); The stability test piece is configured to drive the sliding block (6) to move the sleeve block (1) and simultaneously drive the moving block (2) to move synchronously, so as to perform a stability intelligent sensing tensile test on the column. The stepped separator is configured such that when the column reaches the specified stable tensile force during the test, the long groove rod (3) is separated first, then the middle groove rod (4) is separated, and finally the short groove rod (5) is separated. The stepped power component is configured to: drive the long groove rod (3) to impact the moving block (2) first, then drive the middle groove rod (4) to impact the moving block (2), and finally drive the short groove rod (5) to impact the moving block (2).

2. The tensile property testing device for column production according to claim 1, characterized in that: The stability test specimen includes: The screw (7) is threadedly connected to the inner wall of the sliding block (6), and the outer wall of the sliding block (6) is connected to an outer seat (8), which is used to guide the sliding block (6) to slide. Two guide rods (9) are located on both sides of the sliding block (6). The guide rods (9) are used to guide the sliding block (6) to slide. The guide rods (9) are fixedly connected to the outer seat (8). A geared motor (10) is installed at one end of the outer seat (8), and the geared motor (10) is used to drive the screw (7) to rotate; The movable sleeve (11) slides on the upper surface of the outer seat (8), and a fixed sleeve (12) is provided on one side of the movable sleeve (11) and is fixedly connected to the outer seat (8). A frame block (13) is fixed to the outer wall of the movable sleeve (11). A protruding rod (14) is fixedly connected to one side of the frame block (13). The protruding rod (14) is slidably connected to the sliding sleeve block (6). Linkage block (15) is connected to one end of protruding rod (14), and both protruding rod (14) and moving block (2) are fixedly connected to linkage block (15); The first pressure sensor (16) is located above the protruding rod (14). The first pressure sensor (16) is fixedly connected to the sliding block (6). The sensing end of the first pressure sensor (16) abuts against the linkage block (15). The second pressure sensor (17) is installed at one end of the linkage block (15). One end of the second pressure sensor (17) is connected to a bracket (18). The sliding block (6) and the second pressure sensor (17) are both fixedly connected to the bracket (18). The sensing end of the second pressure sensor (17) is in contact with the linkage block (15).

3. The tensile property testing device for column production according to claim 2, characterized in that: A gap is provided between the fixed sleeve (12) and the movable sleeve (11), and the upper surface of the fixed sleeve (12) and the upper surface of the movable sleeve (11) are on the same horizontal plane.

4. The tensile property testing device for column production according to claim 2, characterized in that: The inner walls of both the movable sleeve (11) and the fixed sleeve (12) are embedded with threaded bolts (19), which are used to press and lock the column.

5. The tensile property testing device for column production according to claim 2, characterized in that: A controller (20) is provided on one side of the outer seat (8), and the second pressure sensor (17) and the first pressure sensor (16) are both electrically connected to the controller (20).

6. The tensile property testing device for column production according to claim 1, characterized in that: The stepped power component includes: The cavity sleeve (21) is fixedly connected to one end of the sleeve block (1), and the long groove rod (3), the middle groove rod (4) and the short groove rod (5) are all slidably connected to the cavity sleeve (21); A shunt tube (22) is connected to one side of the outer wall of the cavity sleeve (21). A valve (23) is fixedly connected to the outer wall of the shunt tube (22). An air pressure sensor (24) for measuring air pressure is embedded at the top of the shunt tube (22). Multiple pistons (25) slide on the inner wall of the cavity sleeve (21), and the multiple pistons (25) are respectively fixedly connected to the long groove rod (3), the middle groove rod (4) and the short groove rod (5); Each piston (25) has a corresponding limiting rod (26) on one side, and the limiting rod (26) is fixedly connected to the cavity sleeve (21).

7. The tensile property testing device for column production according to claim 6, characterized in that: The multiple pistons (25) and the multiple limiting rods (26) are arranged sequentially from top to bottom.

8. The tensile property testing device for column production according to claim 6, characterized in that: A gap is provided between the piston (25) and one side of the inner wall of the cavity sleeve (21), and the long groove rod (3), the middle groove rod (4) and the short groove rod (5) are arranged in sequence from top to bottom.

9. The tensile property testing device for column production according to claim 1, characterized in that: The stepped separator includes: Multiple diversion blocks (27) are disposed on one side of the outer wall of the long groove rod (3), and the length of the multiple diversion blocks (27) increases sequentially from top to bottom; Linkage bar (28) is provided at one end of the diversion block (27), and multiple diversion blocks (27) are fixedly connected to the linkage bar (28); The slider (29) is fixed to the top of the linkage bar (28). The slider (29) is slidably connected to the sleeve block (1). An electric cylinder (30) is provided on one side of the slider (29). The outer wall of the electric cylinder (30) is fixedly connected to the sleeve block (1). The electric cylinder (30) is used to push the slider (29) to move.

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