Device for testing mechanical property of hot-rolled ribbed steel bar

Abstract

The invention discloses a hot-rolled ribbed steel bar mechanical property testing device, and relates to the technical field of mechanical property testing, the hot-rolled ribbed steel bar mechanical property testing device comprises an H-shaped column and an operation table, the upper portion of the H-shaped column is fixedly connected with the operation table, one side, away from the H-shaped column, of the operation table is movably connected with a transverse plate, and the H-shaped column, the operation table and the transverse plate are jointly provided with a pressure bending degree testing assembly; the pressure value of the hot-rolled ribbed steel bar can be tested through downward pressing of the extrusion block, the two ends of the hot-rolled ribbed steel bar can be bent upwards through the electric telescopic rods so that the bending degree of the hot-rolled ribbed steel bar can be tested, and the H-shaped column and the operation table are jointly provided with a mechanical tension testing assembly. Relative movement of a tension block can pull a steel wire rope to perform mechanical tension test on the hot-rolled ribbed steel bar, by arranging a pressure curvature test assembly, a rotating plate can prevent the two ends of the hot-rolled ribbed steel bar from upwarping, and downward pressing of an extrusion block can test the pressure value of the hot-rolled ribbed steel bar.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical property testing, and in particular to a mechanical property testing device for hot-rolled ribbed steel bars. Background Art

[0002] Hot-rolled ribbed steel bars are an important building material widely used in the construction industry. Their quality and performance are directly related to the safety and durability of building structures. With the continuous advancement of construction engineering technology and the increasing requirements for engineering quality, higher requirements are also put forward for the mechanical properties testing of hot-rolled ribbed steel bars. In order to meet this demand, a hot-rolled ribbed steel bar mechanical properties testing device came into being. The device can simulate the stress conditions of steel bars in actual use and accurately test their key mechanical properties indicators such as tensile strength, yield strength, and elongation.

[0003] After searching, the invention patent with Chinese patent number CN115839879A discloses an on-site detection device for the mechanical properties of steel bars in reinforced concrete components. Compared with the prior art, the invention with Chinese patent number CN115839879A is a device for testing the mechanical properties of steel bars in reinforced concrete components in conjunction with a portable mechanical properties tester, which is suitable for beams, columns, shear walls and floor slabs. The device is fixed to the surface of the reinforced concrete component by expansion bolts, and then the portable indentation mechanical properties tester is fixed to the device to achieve mechanical testing of the steel bars in the reinforced concrete. The device is equipped with a coordinate slider, which allows the machine to move within a certain range of X and Y coordinates without disassembly, thereby achieving mechanical testing of different points on the part to be tested. In this way, the relevant mechanical properties test of the specimen can be completed with one fixation.

[0004] However, in actual use, the above-mentioned device mainly evaluates the mechanical properties of steel bars through indentation tests, and it is difficult to directly and accurately measure the mechanical response of steel bars in a bending state, such as key indicators such as bending strength and bending stiffness. This limits its comprehensiveness in evaluating the overall mechanical properties of steel bars. At the same time, although the device can be used to apply tensile force to the steel bars for testing, since the device is fixed on the surface of reinforced concrete components, it is difficult to completely simulate the free state of the steel bars, which may lead to a certain deviation between the test results and the actual usage. Therefore, it is necessary to propose a mechanical properties testing device for hot-rolled ribbed steel bars. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings in the prior art that it is difficult to directly and accurately measure the mechanical response of steel bars in a bending state, it is difficult to completely simulate the free state of the steel bars, and this may lead to a certain deviation between the test results and the actual usage conditions, and to propose a hot-rolled ribbed steel bar mechanical properties testing device.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A hot-rolled ribbed steel bar mechanical property testing device comprises an H-shaped column and an operating table, wherein the upper part of the H-shaped column is fixedly connected to the operating table, and a transverse plate is movably connected to the side of the operating table away from the H-shaped column, and a pressure bending test assembly is commonly provided on the H-shaped column, the operating table and the transverse plate, and the pressure bending test assembly comprises an extrusion block movably connected to the transverse plate, a hot-rolled ribbed steel bar and a rotating plate movably connected to the operating table, and an electric telescopic rod movably connected to the H-shaped column, wherein the rotating plate prevents the two ends of the hot-rolled ribbed steel bar from warping upwards, The downward pressure of the extrusion block can test the pressure value of the hot-rolled ribbed steel bars, and the electric telescopic rod will make the two ends of the hot-rolled ribbed steel bars bend upward to test the bending degree of the hot-rolled ribbed steel bars. The H-shaped column and the operating table are jointly provided with a mechanical tensile test component, and the mechanical tensile test component includes a threaded pipe and a tension plate movably connected on the operating table, and a steel wire rope and a tension block movably connected on the H-shaped column. The threaded pipe will lock the hot-rolled ribbed steel bars, and the relative movement of the tension block will pull the steel wire rope to perform a mechanical tensile test on the hot-rolled ribbed steel bars.

[0008] The above technical solution further includes:

[0009] A plurality of support columns are fixedly connected to one side of the operating table away from the H-shaped column, and one end of the plurality of support columns away from the operating table is fixedly connected to the cross plate. The function of the support columns is to connect the operating table and the cross plate and to support the cross plate. A telescopic motor is fixedly connected to one side of the cross plate away from the support columns, and the telescopic motor is placed on the upper part of the cross plate.

[0010] The output shaft end of the telescopic motor is fixedly connected with a telescopic shaft, and one end of the telescopic shaft away from the telescopic motor is fixedly connected to the extrusion block, and the movement of the telescopic shaft in the vertical direction will drive the extrusion block to move in the vertical direction.

[0011] A cross bar is fixedly connected to the side of the operating table away from the H-column, a placement groove is opened inside the cross bar, the inner side of the placement groove is movably connected to the hot-rolled ribbed steel bars, and a fixed axis is symmetrically fixedly connected to the side of the operating table away from the H-column, the outer side of the fixed axis is rotatably connected to a rotating plate, and the rotating plate is rotated to contact the upper surface of the cross bar, which can prevent the two ends of the hot-rolled ribbed steel bars from warping upward on the inner side of the placement groove.

[0012] A U-shaped plate is fixedly connected to the outer side of the H-shaped column, a servo motor is fixedly connected to the side of the U-shaped plate close to the operating table, a first bidirectional threaded rod is fixedly connected to the end of the output shaft of the servo motor, the start of the servo motor can drive the first bidirectional threaded rod to rotate, the first bidirectional threaded rod and the operating table are movably connected, the first limit rod and the second limit rod are fixedly connected to the opposite sides of the two groups of H-shaped columns, and the first limit rod and the second limit rod are both used for limiting the position.

[0013] The first bidirectional threaded rod is threadedly connected to the moving block, and there are two groups of moving blocks. Both groups of moving blocks are slidably connected to the first limit rod. The side of the moving block close to the operating table is fixedly connected to the electric telescopic rod, and the end of the electric telescopic rod away from the moving block is in contact with the hot-rolled ribbed steel bar. The upward lifting of the electric telescopic rod can test the bending degree of the hot-rolled ribbed steel bar.

[0014] The operating table and the cross bar are jointly provided with a plurality of through holes, and the plurality of through holes are linearly and evenly distributed along the operating table. The plurality of through holes can be used to test the bending degree of the hot-rolled ribbed steel bars at different locations.

[0015] The cross bar and the threaded tube are threadedly connected, and the number of the threaded tubes is two groups. The end of the threaded tube away from the cross bar is rotatably connected to the tension plate, and the threaded tube can be connected to one end of the hot-rolled ribbed steel bar. The end of the tension plate away from the threaded tube is fixedly connected to the steel wire rope. The tension plate can increase the force-bearing area of ​​the tension, and the number of the steel wire ropes is two groups.

[0016] The outer side of the operating table is symmetrically provided with opening grooves, the inner side of the opening grooves is rotatably connected with a rotating shaft, the outer side of the rotating shaft is in contact with the wire rope, the rotating shaft rotates on the inner side of the opening grooves, and the rotating shaft can change the pulling direction of the wire rope.

[0017] The outer side of the first bidirectional threaded rod is connected to a transmission belt, and one end of the transmission belt away from the first bidirectional threaded rod is connected to a second bidirectional threaded rod. The outer side of the second bidirectional threaded rod is rotatably connected to the H-shaped column, and the tension block and the second bidirectional threaded rod are threadedly connected. There are two groups of tension blocks, and the side of the tension block close to the H-shaped column is fixedly connected to the steel wire rope. The relative movement of the tension block will pull the steel wire rope to perform a mechanical tension test on the hot-rolled ribbed steel bars, which can directly measure the mechanical properties of the steel bars under tension. The tension block is slidably connected to the second limit rod.

[0018] The present invention has the following beneficial effects:

[0019] 1. In the present invention, by setting a pressure bending test component, the rotating plate can prevent the two ends of the hot-rolled ribbed steel bars from curling up, the downward pressure of the extrusion block can test the pressure value of the hot-rolled ribbed steel bars, and the cooperation between the extrusion block and the electric telescopic rod will make the two ends of the hot-rolled ribbed steel bars bend upward to test the curvature of the hot-rolled ribbed steel bars. The bending performance test of the steel bars can be directly carried out, and the bending strength and bending stiffness under pressure can be accurately evaluated.

[0020] 2. In the present invention, by setting a mechanical tensile test component, the threaded pipe will further lock the hot-rolled ribbed steel bar, and the relative movement of the tension block will pull the steel wire rope to perform a mechanical tensile test on the hot-rolled ribbed steel bar, which can directly measure the mechanical properties of the steel bar in a tensile state, such as tensile strength, and can completely simulate the free state of the steel bar, so that there is no deviation between the test result and the actual use situation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of a hot-rolled ribbed steel bar mechanical properties testing device proposed by the present invention;

[0022] Figure 2 This is a schematic diagram of the overall side view of a hot-rolled ribbed steel bar mechanical properties testing device proposed by the present invention;

[0023] Figure 3 This is a schematic diagram of the overall bottom view structure of a hot-rolled ribbed steel bar mechanical properties testing device proposed by the present invention;

[0024] Figure 4 for Figure 1 A schematic diagram of the structure enlargement in the middle;

[0025] Figure 5 for Figure 3 A magnified schematic diagram of the structure at B in the middle;

[0026] Figure 6 for Figure 1 A magnified schematic diagram of the structure at C in the middle;

[0027] Figure 7 for Figure 3 Enlarged schematic diagram of the structure at point D in the middle.

[0028] In the figure: 1. H-shaped column; 2. operating table; 3. supporting column; 4. cross plate; 5. telescopic motor; 6. telescopic shaft; 7. extrusion block; 8. cross bar; 9. placement slot; 10. hot-rolled ribbed steel bar; 11. fixed axis; 12. rotating plate; 13. U-shaped plate; 14. servo motor; 15. first bidirectional threaded rod; 16. moving block; 17. electric telescopic rod; 18. first limit rod; 19. through hole; 20. transmission belt; 21. second bidirectional threaded rod; 22. threaded pipe; 23. tension plate; 24. wire rope; 25. hole slot; 26. rotating shaft; 27. tension block; 28. second limit rod. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Embodiment 1

[0031] like Figure 1-Figure 7 As shown, a hot-rolled ribbed steel bar mechanical property testing device proposed by the present invention comprises an H-shaped column 1 and an operating table 2, wherein the upper part of the H-shaped column 1 is fixedly connected to the operating table 2, and a side of the operating table 2 away from the H-shaped column 1 is movably connected to a transverse plate 4, and the H-shaped column 1, the operating table 2 and the transverse plate 4 are jointly provided with a pressure bending test assembly, and the pressure bending test assembly comprises an extrusion block 7 movably connected to the transverse plate 4, a hot-rolled ribbed steel bar 10 and a rotating plate 12 movably connected to the operating table 2, and an electric telescopic rod 17 movably connected to the H-shaped column 1, and the rotating plate 12 prevents the two ends of the hot-rolled ribbed steel bar 10 from warping upward The downward pressure of the extrusion block 7 can test the pressure value of the hot-rolled ribbed steel bar 10, and the electric telescopic rod 17 will make the two ends of the hot-rolled ribbed steel bar 10 bend upward to test the bending degree of the hot-rolled ribbed steel bar 10. A mechanical tensile test component is jointly arranged on the H-shaped column 1 and the operating table 2. The mechanical tensile test component includes a threaded tube 22 and a tension plate 23 movably connected on the operating table 2, and a steel wire rope 24 and a tension block 27 movably connected on the H-shaped column 1. The threaded tube 22 will lock the hot-rolled ribbed steel bar 10, and the relative movement of the tension block 27 will pull the steel wire rope 24 to perform a mechanical tensile test on the hot-rolled ribbed steel bar 10.

[0032] A plurality of support columns 3 are fixedly connected to one side of the operating table 2 away from the H-shaped column 1, and one end of the plurality of support columns 3 away from the operating table 2 is fixedly connected to the cross board 4. The function of the support columns 3 is to connect the operating table 2 and the cross board 4 and to support the cross board 4. A telescopic motor 5 is fixedly connected to one side of the cross board 4 away from the support columns 3, and the telescopic motor 5 is placed on the upper part of the cross board 4.

[0033] The output shaft end of the telescopic motor 5 is fixedly connected with a telescopic shaft 6, and the end of the telescopic shaft 6 away from the telescopic motor 5 is fixedly connected to the extrusion block 7. The movement of the telescopic shaft 6 in the vertical direction will drive the extrusion block 7 to move in the vertical direction.

[0034] A cross bar 8 is fixedly connected to the side of the operating table 2 away from the H-shaped column 1, and a placement groove 9 is opened inside the cross bar 8. The inner side of the placement groove 9 is movably connected to the hot-rolled ribbed steel bar 10. A fixed axis 11 is symmetrically fixedly connected to the side of the operating table 2 away from the H-shaped column 1, and the outer side of the fixed axis 11 is rotatably connected to a rotating plate 12. The rotating plate 12 is rotated to contact the upper surface of the cross bar 8, which can prevent the two ends of the hot-rolled ribbed steel bar 10 from curling upward on the inner side of the placement groove 9.

[0035] A U-shaped plate 13 is fixedly connected to the outer side of the H-shaped column 1, and a servo motor 14 is fixedly connected to the side of the U-shaped plate 13 close to the operating table 2. A first bidirectional threaded rod 15 is fixedly connected to the end of the output shaft of the servo motor 14. The start of the servo motor 14 can drive the first bidirectional threaded rod 15 to rotate. The first bidirectional threaded rod 15 and the operating table 2 are movably connected. The opposite sides of the two groups of H-shaped columns 1 are commonly fixedly connected with a first limit rod 18 and a second limit rod 28. The first limit rod 18 and the second limit rod 28 are both used for limiting the position.

[0036] In this embodiment, the rotating plate 12 can prevent the two ends of the hot-rolled ribbed steel bars 10 from curling up, the downward pressure of the extrusion block 7 can test the pressure value of the hot-rolled ribbed steel bars 10, and the mutual cooperation of the extrusion block 7 and the electric telescopic rod 17 can make the two ends of the hot-rolled ribbed steel bars 10 bend upward to test the bending degree of the hot-rolled ribbed steel bars 10, and the bending performance test of the steel bars can be directly performed. The specific implementation method is that the H-shaped column 1 mainly plays a supporting role, the function of the operating table 2 is to connect the H-shaped column 1 and the support column 3, the support column 3 mainly plays a supporting role and connects the operating table 2 and the cross plate 4, the telescopic motor 5 is placed above the cross plate 4, and the output shaft end of the telescopic motor 5 is fixedly connected to the telescopic shaft 6. When the telescopic motor 5 is started, the output shaft end of the telescopic motor 5 can bring The movable telescopic shaft 6 moves back and forth in the vertical direction. The movement of the telescopic shaft 6 can drive the extrusion block 7 to move downward. When performing a pressure test on the hot-rolled ribbed steel bar 10, the rotating plate 12 needs to be rotated so that the rotating plate 12 contacts the upper surface of the cross bar 8. The rotating plate 12 is connected to the operating table 2 through the fixed shaft 11. The function of the rotating plate 12 is to prevent the two ends of the hot-rolled ribbed steel bar 10 from tilting upward when the extrusion block 7 performs a pressure test on the hot-rolled ribbed steel bar 10, thereby affecting the accuracy of the pressure test. After the extrusion block 7 performs a pressure test on the hot-rolled ribbed steel bar 10, the rotating plate 12 needs to be rotated to the outside of the cross bar 8, and the extrusion block 7 contacts the outer surface of the hot-rolled ribbed steel bar 10. The function of the U-shaped plate 13 is to connect the H-shaped column 1 and the servo motor 14;

[0037] Start the servo motor 14, the output shaft end of the servo motor 14 will drive the first bidirectional threaded rod 15 to rotate, because the first bidirectional threaded rod 15 and the moving block 16 are threadedly connected, the first limit rod 18 can limit the position of the moving block 16, the moving block 16 can be translated to a suitable position, the movement of the moving block 16 can drive the electric telescopic rod 17 to move, a plurality of through holes 19 are provided between the operating table 2 and the cross bar 8, the electric telescopic rod 17 passes through the through holes 19 and contacts the hot-rolled ribbed steel bars 10 on the inner side of the cross bar 8, at this time, start the electric telescopic rod 17, the end of the electric telescopic rod 17 will squeeze the hot-rolled ribbed steel bars 10 upward, the extrusion block 7 has a position limit on the hot-rolled ribbed steel bars 10 at the top, the mutual cooperation between the extrusion block 7 and the electric telescopic rod 17 will make the two ends of the hot-rolled ribbed steel bars 10 bend upward to test the bending degree of the hot-rolled ribbed steel bars 10, and the bending performance test of the steel bars can be directly performed, and the bending strength and bending stiffness under pressure can be accurately evaluated.

[0038] Embodiment 2

[0039] like Figure 1-Figure 7As shown, based on the first embodiment, the first bidirectional threaded rod 15 and the moving block 16 are threadedly connected, the number of the moving blocks 16 is two groups, the two groups of moving blocks 16 are slidably connected to the first limit rod 18, the side of the moving block 16 close to the operating table 2 is fixedly connected to the electric telescopic rod 17, the end of the electric telescopic rod 17 away from the moving block 16 is in contact with the hot-rolled ribbed steel bar 10, and the upward lifting of the electric telescopic rod 17 can test the bending degree of the hot-rolled ribbed steel bar 10.

[0040] The operating table 2 and the cross bar 8 are provided with a plurality of through holes 19 , which are evenly distributed linearly along the operating table 2 . The plurality of through holes 19 can be used to test the curvature of the hot-rolled ribbed steel bars 10 at different locations.

[0041] The cross bar 8 and the threaded tube 22 are threadedly connected, and the number of the threaded tube 22 is two groups. The end of the threaded tube 22 away from the cross bar 8 is rotatably connected to the tension plate 23. The threaded tube 22 can be connected to one end of the hot-rolled ribbed steel bar 10. The end of the tension plate 23 away from the threaded tube 22 is fixedly connected to the steel wire rope 24. The tension plate 23 can increase the force-bearing area of ​​the tension. The number of the steel wire rope 24 is two groups.

[0042] The outer side of the operating table 2 is symmetrically provided with an opening groove 25, and the inner side of the opening groove 25 is rotatably connected with a rotating shaft 26. The outer side of the rotating shaft 26 is in contact with the wire rope 24. The rotating shaft 26 rotates on the inner side of the opening groove 25, and the rotating shaft 26 can change the pulling direction of the wire rope 24.

[0043] The outer side of the first bidirectional threaded rod 15 is connected to a transmission belt 20, and one end of the transmission belt 20 away from the first bidirectional threaded rod 15 is connected to a second bidirectional threaded rod 21. The outer side of the second bidirectional threaded rod 21 is rotatably connected to the H-shaped column 1, and the tension block 27 and the second bidirectional threaded rod 21 are threadedly connected. There are two groups of tension blocks 27, and the tension block 27 is fixedly connected to the side of the H-shaped column 1 and the steel wire rope 24. The relative movement of the tension block 27 will pull the steel wire rope 24 to perform a mechanical tension test on the hot-rolled ribbed steel bar 10, which can directly measure the mechanical properties of the steel bar under tension. The tension block 27 is slidably connected to the second limit rod 28.

[0044] In this embodiment, further, the threaded tube 22 will lock the hot-rolled ribbed steel bar 10, and the relative movement of the tension block 27 will pull the steel wire rope 24 to perform a mechanical tension test on the hot-rolled ribbed steel bar 10, which can directly measure the mechanical properties of the steel bar in a tensile state. The specific implementation method is that when performing a mechanical tension test, the position of the hot-rolled ribbed steel bar 10 is limited by the contact extrusion block 7, so that the hot-rolled ribbed steel bar 10 is in a free state, and the threaded tube 22 is rotated to engage with the hot-rolled ribbed steel bar 10. At this time, the upper end of the electric telescopic rod 17 is no longer in contact with the hot-rolled ribbed steel bar 10, but is retracted on the operating table 2. , the start of the servo motor 14 can drive the first bidirectional threaded rod 15 to rotate, the rotation of the first bidirectional threaded rod 15 can rotate the second bidirectional threaded rod 21 through the transmission belt 20, the rotation of the second bidirectional threaded rod 21 can drive the relative movement of the two sets of tension blocks 27, the movement of the tension blocks 27 will pull the steel wire rope 24, thereby pulling the hot-rolled ribbed steel bar 10 for tension testing, an opening slot 25 is provided on the outer side of the operating table 2, the function of the rotating shaft 26 is to change the direction of the steel wire rope 24, the rotating shaft 26 can rotate on the inner side of the opening slot 25, thereby assisting the steering of the steel wire rope 24.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hot-rolled ribbed steel bar mechanical properties testing device, comprising an H-shaped column (1) and an operating table (2), characterized in that: The upper part of the H-shaped column (1) is fixedly connected to the operating platform (2); a side of the operating platform (2) away from the H-shaped column (1) is movably connected to a transverse plate (4); the H-shaped column (1), the operating platform (2) and the transverse plate (4) are jointly provided with a pressure bending test assembly, the pressure bending test assembly comprising an extrusion block (7) movably connected to the transverse plate (4), a hot-rolled ribbed steel bar (10) and a rotating plate (12) movably connected to the operating platform (2), and an electric telescopic rod (17) movably connected to the H-shaped column (1); the rotating plate (12) prevents the two ends of the hot-rolled ribbed steel bar (10) from tilting upwards; the downward pressure of the extrusion block (7) can test the pressure value of the hot-rolled ribbed steel bar (10); the electric telescopic rod (17) causes the two ends of the hot-rolled ribbed steel bar (10) to bend upwards for testing the bending degree of the hot-rolled ribbed steel bar (10); The H-shaped column (1) and the operating table (2) are jointly provided with a mechanical tensile test assembly, the mechanical tensile test assembly comprising a threaded tube (22) and a tension plate (23) movably connected on the operating table (2), and a steel wire rope (24) and a tension block (27) movably connected on the H-shaped column (1), the threaded tube (22) will lock the hot-rolled ribbed steel bar (10), and the relative movement of the tension block (27) will pull the steel wire rope (24) to perform a mechanical tensile test on the hot-rolled ribbed steel bar (10).

2. A hot-rolled ribbed steel bar mechanical properties testing device according to claim 1, characterized in that: A plurality of support columns (3) are fixedly connected to a side of the operating table (2) away from the H-shaped column (1); one end of the plurality of support columns (3) away from the operating table (2) is fixedly connected to a horizontal plate (4); and a telescopic motor (5) is fixedly connected to a side of the horizontal plate (4) away from the support columns (3).

3. A hot-rolled ribbed steel bar mechanical properties testing device according to claim 2, characterized in that: The end of the output shaft of the telescopic motor (5) is fixedly connected to a telescopic shaft (6), and one end of the telescopic shaft (6) away from the telescopic motor (5) is fixedly connected to an extrusion block (7).

4. A hot-rolled ribbed steel bar mechanical properties testing device according to claim 1, characterized in that: A cross bar (8) is fixedly connected to the side of the operating platform (2) away from the H-shaped column (1), a placement groove (9) is provided inside the cross bar (8), the inner side of the placement groove (9) is movably connected to the hot-rolled ribbed steel bar (10), and a fixed shaft (11) is symmetrically fixedly connected to the side of the operating platform (2) away from the H-shaped column (1), and the outer side of the fixed shaft (11) is rotatably connected to the rotating plate (12).

5. The hot-rolled ribbed steel bar mechanical properties testing device according to claim 1, characterized in that: A U-shaped plate (13) is fixedly connected to the outer side of the H-shaped column (1); a servo motor (14) is fixedly connected to the side of the U-shaped plate (13) close to the operating table (2); a first bidirectional threaded rod (15) is fixedly connected to the end of the output shaft of the servo motor (14); the first bidirectional threaded rod (15) and the operating table (2) are movably connected; and a first limiting rod (18) and a second limiting rod (28) are fixedly connected to the opposite sides of the two groups of H-shaped columns (1).

6. A hot-rolled ribbed steel bar mechanical properties testing device according to claim 5, characterized in that: The first bidirectional threaded rod (15) and the moving block (16) are threadedly connected, the moving blocks (16) are in two groups, both groups of the moving blocks (16) are slidably connected to the first limit rod (18), the side of the moving block (16) close to the operating table (2) is fixedly connected to the electric telescopic rod (17), and the end of the electric telescopic rod (17) away from the moving block (16) is in contact with the hot-rolled ribbed steel bar (10).

7. A hot-rolled ribbed steel bar mechanical properties testing device according to claim 4, characterized in that: The operating table (2) and the crossbar (8) are jointly provided with a plurality of through holes (19), and the plurality of through holes (19) are linearly and evenly distributed along the operating table (2).

8. A hot-rolled ribbed steel bar mechanical properties testing device according to claim 4, characterized in that: The cross bar (8) and the threaded tube (22) are threadedly connected, and the number of the threaded tube (22) is two groups. The end of the threaded tube (22) away from the cross bar (8) is rotatably connected to the tension plate (23), and the end of the tension plate (23) away from the threaded tube (22) is fixedly connected to the steel wire rope (24), and the number of the steel wire rope (24) is two groups.

9. A hot-rolled ribbed steel bar mechanical properties testing device according to claim 1, characterized in that: The outer side of the operating table (2) is symmetrically provided with an opening slot (25), the inner side of the opening slot (25) is rotatably connected with a rotating shaft (26), and the outer side of the rotating shaft (26) is in contact with the steel wire rope (24).

10. A hot-rolled ribbed steel bar mechanical properties testing device according to claim 5, characterized in that: The outer side of the first bidirectional threaded rod (15) is transmission-connected with a transmission belt (20), and one end of the transmission belt (20) away from the first bidirectional threaded rod (15) is transmission-connected with a second bidirectional threaded rod (21). The outer side of the second bidirectional threaded rod (21) is rotationally connected to the H-shaped column (1), and the tension block (27) and the second bidirectional threaded rod (21) are threadedly connected. The tension blocks (27) are provided in two groups. The side of the tension block (27) close to the H-shaped column (1) is fixedly connected to the steel wire rope (24), and the tension block (27) and the second limit rod (28) are slidably connected.

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