Clamp for tensile test of high-carbon steel material

Abstract

The invention discloses a clamp for a high-carbon steel tensile test, and belongs to the technical field of steel tensile test clamps, the clamp comprises a test machine table, a hollow cross beam is fixedly connected to the test machine table, a scrap falling concave table is arranged above the test machine table, and guide sliding grooves are formed in the two sides of the test machine table. According to the steel stretching device, an electric push rod is started to push a moving plate to move, a second guide groove is promoted to push a sliding rod, two clamping plates are driven to move oppositely in a first guide groove through a sliding block, so that steel is clamped, a driving motor is started to rotate a threaded lead screw, a moving table drives a clamping table to move, and therefore the steel is stretched; and through stretching in the horizontal state, chippings generated by deformation can fall on a chipping falling concave table, so that the situation that the chippings influence the clamping effect is avoided, a worker can further screw a connecting block to enable a threaded rod to push a pressing block to press and fix the steel, and therefore the clamping effect is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of steel tensile test fixtures, in particular to a fixture used for high-carbon steel tensile test. Background Art

[0002] High carbon steel is carbon steel with a carbon content greater than 0.65%. High carbon steel includes carbon tool steel and some carbon structural steel. It is hard and brittle and can be quenched. High carbon steel is mainly used to make smaller tools and connecting springs. After the production of high carbon steel is completed, the steel needs to be sampled to determine the chemical or physical properties of the material, including the tensile test of steel. The tensile test refers to a test method for determining the properties of a material under an axial tensile load, also known as a tensile test. It is one of the basic methods for testing the mechanical properties of materials. It is mainly used to test whether the material meets the specified standards and to study the performance of the material.

[0003] At present, most steel tensile testing machines use a vertical method to perform tensile tests on steel. During the stretching, the steel will deform or even break, and the debris produced by the deformation and breakage of the steel will fall on the fixture. Since the steel used for tensile tests is mostly bars, which are difficult to fix, the falling debris will further reduce the clamping effect of the fixture, and the debris flying around will also cause harm to the surrounding staff. Summary of the invention

[0004] In order to overcome the above-mentioned defects, the present invention provides a clamp for tensile testing of high-carbon steel, which solves the problem that the steel may be deformed or even broken during stretching, and the debris produced by the deformation and fracture will fall on the clamp, thereby reducing the clamping effect of the clamp, and the debris will splash everywhere and cause harm to the surrounding staff.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a fixture for tensile testing of high-carbon steel, comprising a test platform, a hollow crossbeam is fixedly connected to the test platform, a chip-dropping concave platform is arranged above the test platform, guide slides are provided on both sides of the test platform, a protective cover shell is slidably installed on the test platform through the guide slides, a fixing frame is fixedly connected to one side of the hollow crossbeam, a driving motor is installed on the fixing frame, and a threaded screw is connected to the output shaft of the driving motor;

[0006] A movable platform is installed on the threaded screw rod, a clamping platform is connected to the movable platform and one side of the test machine platform, a guide sleeve is installed on the movable platform, a first guide groove is provided on the clamping platform, an electric push rod is fixedly installed inside the clamping platform, a movable end of the electric push rod is fixedly connected to a movable plate, a second guide groove is provided on the movable plate, and a sliding rod is slidably connected in the second guide groove;

[0007] A sliding block is fixedly connected above the sliding rod, a clamping plate is fixedly connected above the sliding block, a threaded rod is threadedly connected to the clamping plate, a clamping block is rotatably connected to one end of the threaded rod, and a connecting block is fixedly connected to the other end of the threaded rod, fixed slats are fixedly connected to both sides of the lower side of the protective cover shell, an observation window is installed on the protective cover shell, and a handle is fixedly connected to the protective cover shell.

[0008] As a further solution of the present invention: the protective cover shell is designed to be U-shaped as a whole, connecting springs are fixedly connected inside the two ends of the fixed slats, and a fixed block is fixedly connected to one end of the connecting spring, and the fixed block slides inside the fixed slats.

[0009] As a further solution of the present invention: a guide cross bar is fixedly connected inside the hollow cross beam, the guide cross bar is located directly above the threaded screw, a through hole is opened on the movable platform, the movable platform is slidably connected to the guide cross bar through the through hole, and the movable platform is in contact with the inner wall of the hollow cross beam.

[0010] As a further solution of the present invention: there are two second guide grooves and both are skewedly arranged on the movable plate, the two skewed second guide grooves mutually form a V-shaped structure, and the sliding block is T-shaped and slides in the first guide groove.

[0011] As a further solution of the present invention: a notch groove is provided on one side of the clamping plate, the clamping block and the notch groove on one side of the clamping plate are interlocked with each other, one side of the clamping block is arc-shaped and connected to a rubber pad, the rubber pad is provided with anti-slip texture, and the connecting block is provided with a hexagonal groove.

[0012] As a further solution of the present invention: the interior of the clamping table is hollow in design, the movable plate slides inside the clamping table, limiting plates are fixedly connected on both sides of the movable plate, limiting grooves are provided on the inner walls on both sides of the clamping table, and the limiting plates slide in the limiting grooves.

[0013] As a further solution of the present invention: the threaded screw is rotatably connected in the hollow crossbeam, the guide sleeve is threadably matched with the threaded screw, support blocks are fixedly connected to the four corners below the test machine, and anti-slip pads are connected below the support blocks.

[0014] As a further solution of the present invention: the fixed slat is slidably connected to the guide slot, a plurality of fixed slots are provided on the slot walls on both sides of the guide slot, and one side of the fixed block is designed as a spherical surface and is embedded in the fixed slot.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. In the present invention, a threaded screw, a movable table, a clamping table, a movable plate, a first guide groove, a second guide groove, a sliding rod, a sliding block, a clamping plate and a pressing block are arranged, and the movable plate is pushed to move in the clamping table by starting the electric push rod. When the movable plate moves, the second guide groove pushes the sliding rod, causing the sliding block to slide along the first guide groove. The two second guide grooves forming a V-shaped structure enable the sliding rod to drive the two clamping plates to move toward each other through the sliding block, thereby clamping and fixing the metal bar. Then, the driving motor is started to rotate the threaded screw, so that the movable table passes The threads of the guide sleeve and the threaded screw cooperate to drive the clamping table to move along the threaded screw, thereby stretching the metal bar. The stretching in the horizontal state can make the debris generated by the deformation fall directly on the chip dropping recess, thereby avoiding the debris from affecting the clamping effect and facilitating cleaning by the staff. The staff can also twist the connecting block to make the threaded rod push the clamping block to move, prompting the clamping block to further clamp and fix the metal bar, and the rubber pad on the clamping block will fit in contact with the metal bar to prevent the metal bar from slipping during stretching, thereby improving the clamping effect.

[0017] 2. In the present invention, by arranging a handle, a protective cover shell, a fixed slat, a guide slot, a connecting spring, a fixed block and a fixed slot, a staff member pulls the protective cover shell by the handle to make the fixed slat slide in the guide slot, thereby adjusting the horizontal position of the protective cover shell on the test machine, and the tensile test area is covered by the protective cover shell to prevent the metal bar from breaking and generating debris flying everywhere, thereby protecting the surrounding staff from being injured, and when the fixed slat slides, the fixed block will be pushed into the fixed slat by the wall of the guide slot, prompting the fixed block to compress the connecting spring, so that the elastic force of the connecting spring rebounds to make the fixed block fit into the fixed slot, thereby fixing the position of the protective cover shell and preventing the protective cover shell from sliding accidentally, and the multiple fixed slots on the wall of the guide slot increase the adjustment range of the position of the protective cover shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the cross-sectional structure of the hollow beam of the present invention;

[0020] Figure 3 It is a schematic diagram of the cross-sectional structure of the clamping table of the present invention;

[0021] Figure 4 It is a schematic diagram of the three-dimensional structure of the clamping plate of the present invention;

[0022] Figure 5 It is a schematic diagram of the cross-sectional structure of the fixed slats of the present invention;

[0023] Figure 6 for Figure 5Schematic diagram of the enlarged structure in part A;

[0024] In the figure: 1. test machine table; 2. hollow crossbeam; 3. chip removal concave table; 4. guide slide groove; 5. protective cover shell; 6. fixed frame; 7. drive motor; 8. threaded screw; 9. movable table; 10. clamping table; 11. guide sleeve; 12. first guide groove; 13. electric push rod; 14. movable plate; 15. second guide groove; 16. sliding rod; 17. sliding block; 18. clamping plate; 19. threaded rod; 20. clamping block; 21. connecting block; 22. fixing strip; 23. observation window; 24. handle; 25. connecting spring; 26. fixing block; 27. guide cross bar; 28. through hole; 29. ​​rubber pad; 30. limit plate; 31. limit groove; 32. support block; 33. anti-skid pad; 34. fixing groove. DETAILED DESCRIPTION

[0025] The technical solution of the present application is further described in detail below in conjunction with specific implementation methods.

[0026] like Figure 1-6 As shown, the present invention provides a technical solution: a fixture for tensile testing of high carbon steel, including a test platform 1, support blocks 32 are fixedly connected at the four corners below the test platform 1, and anti-skid pads 33 are connected below the support blocks 32. The anti-skid pads 33 below the support blocks 32 can increase the friction between the support blocks 32 and the ground, thereby preventing the support blocks 32 and the test platform 1 from sliding, thereby improving the stability of the test platform 1.

[0027] Guide slots 4 are provided on both sides of the test bench 1, and a protective cover shell 5 is slidably installed on the test bench 1 through the guide slots 4. Fixed slats 22 are fixedly connected to both sides of the lower side of the protective cover shell 5, an observation window 23 is installed on the protective cover shell 5, and a handle 24 is fixedly connected to the protective cover shell 5. Specifically, the protective cover shell 5 is designed in a U-shape as a whole, and connecting springs 25 are fixedly connected to the inside of the two ends of the fixed slats 22, and a fixed block 26 is fixedly connected to one end of the connecting spring 25, and the fixed block 26 slides inside the fixed slats 22; the fixed slats 22 are slidably connected to the guide slots 4, and a plurality of fixed slots 34 are provided on the groove walls on both sides of the guide slots 4, and one side of the fixed block 26 is designed as a spherical curved surface and is embedded in the fixed slots 34.

[0028] When the staff pulls the protective cover shell 5 by the handle 24, the fixed slat 22 will move along the guide groove 4, so that the movement of the protective cover shell 5 is guided by the guide groove 4, so that the staff can move the protective cover shell 5 in the horizontal direction to prevent the protective cover shell 5 from tilting during movement. The spherical surface on one side of the fixed block 26 makes it possible for the groove wall of the guide groove 4 to easily push the fixed block 26 to move when the fixed slat 22 slides in the guide groove 4, so that the fixed block 26 can slide into the fixed slat 22, thereby facilitating the staff to pull the protective cover shell 5 and adjust the position of the protective cover shell 5 to cover and isolate the tensile test area.

[0029] A hollow crossbeam 2 is fixedly connected to the test machine 1, a fixing frame 6 is fixedly connected to one side of the hollow crossbeam 2, a driving motor 7 is installed on the fixing frame 6, a threaded screw 8 is connected to the output shaft of the driving motor 7, the threaded screw 8 is rotatably connected in the hollow crossbeam 2, a movable platform 9 is installed on the threaded screw 8, a guide sleeve 11 is installed on the movable platform 9, and the guide sleeve 11 is threadedly matched with the threaded screw 8. A guide crossbar 27 is fixedly connected inside the hollow crossbeam 2, and the guide crossbar 27 is located directly above the threaded screw 8. A through hole 28 is opened on the movable platform 9, and the movable platform 9 is slidably connected to the guide crossbar 27 through the through hole 28, and the movable platform 9 is in contact with the inner wall of the hollow crossbeam 2.

[0030] The through hole 28 enables the movable platform 9 to move along the guide cross bar 27, so that when the threaded screw 8 rotates to make the movable platform 9 move along the threaded screw 8 through the guide sleeve 11, the guide cross bar 27 can guide the movement of the movable platform 9, so that the movable platform 9 can move smoothly along the threaded screw 8, avoiding the movable platform 9 from rotating together with the rotating threaded screw 8 and causing skew, so that the metal bar can be stretched smoothly in the horizontal direction.

[0031] A clamping table 10 is connected to the movable table 9 and one side of the test machine table 1. A first guide groove 12 is provided on the clamping table 10. An electric push rod 13 is fixedly installed inside the clamping table 10. A movable plate 14 is fixedly connected to the movable end of the electric push rod 13. The interior of the clamping table 10 is hollow in design. The movable plate 14 slides inside the clamping table 10. Limiting plates 30 are fixedly connected on both sides of the movable plate 14. Limiting grooves 31 are provided on the inner walls on both sides of the clamping table 10. The limiting plates 30 slide in the limiting grooves 31. When the electric push rod 13 is started to push the movable plate 14 to move in the clamping table 10, the limiting plates 30 on both sides of the movable plate 14 will slide along the limiting grooves 31, thereby limiting and guiding the movement of the movable plate 14, avoiding the movable plate 14 from tilting during movement, and promoting the movable plate 14 to move smoothly in the clamping table 10. The threads of the guide sleeve 11 cooperate with the threaded screw 8, so that when the threaded screw 8 rotates, the movable table 9 can drive the clamping table 10 to move along the threaded screw 8 through the guide sleeve 11, thereby horizontally stretching the tested metal bar. A chip dropping recess 3 is provided above the test machine 1, and the metal debris generated by the stretching deformation of the metal bar will directly fall on the chip dropping recess 3, so that the staff can clean and collect it conveniently.

[0032] A second guide groove 15 is provided on the movable plate 14, in which a sliding rod 16 is slidably connected, a sliding block 17 is fixedly connected above the sliding rod 16, and a clamping plate 18 is fixedly connected above the sliding block 17. There are two second guide grooves 15 and both are skewedly arranged on the movable plate 14. The two skewed second guide grooves 15 form a V-shaped structure with each other. The sliding block 17 is T-shaped and slides in the first guide groove 12. When the electric push rod 13 pushes the movable plate 14 to move, the sliding rod 16 will slide in the second guide groove 15, and the two skewed second guide grooves 15 forming a V-shaped structure can push the sliding rod 16, so that the sliding block 17 drives the two clamping plates 18 to move toward each other along the first guide groove 12, thereby clamping and fixing the metal bar used for the test to prevent the metal bar from falling off and affecting the tensile test, and the T-shaped sliding block 17 can make the clamping plate 18 move smoothly to avoid the clamping effect being reduced due to the skew of the clamping plate 18.

[0033] A threaded rod 19 is threadedly connected to the clamping plate 18, one end of the threaded rod 19 is rotatably connected to a clamping block 20, and the other end of the threaded rod 19 is fixedly connected to a connecting block 21. A notch groove is provided on one side of the clamping plate 18, and the clamping block 20 is engaged with the notch groove on one side of the clamping plate 18. One side of the clamping block 20 is arc-shaped and connected to a rubber pad 29, and the rubber pad 29 is provided with anti-slip textures. A hexagonal groove is provided on the connecting block 21, and the arc surface on one side of the clamping block 20 can increase the contact surface with the test bar, thereby improving the clamping After the electric push rod 13 is started to clamp the metal bar with the clamping plate 18, the staff can use the Allen wrench to twist the connecting block 21 to rotate the threaded rod 19, so that the threaded rod 19 can push the clamping block 20 to move, so that the clamping block 20 can clamp and fix the metal bar. At this time, the rubber pad 29 will be squeezed and deformed to fit the metal bar, thereby increasing the friction between the rubber pad 29 and the metal bar through the anti-slip texture on the rubber pad 29, thereby preventing the metal bar from accidentally slipping during the tensile test.

[0034] The protective cover shell 5 is fixedly connected to fixed slats 22 on both sides below, an observation window 23 is installed on the protective cover shell 5, and a handle 24 is fixedly connected to the protective cover shell 5. The protective cover shell 5 is designed in a U shape as a whole. Connecting springs 25 are fixedly connected to the two ends of the fixing slats 22, and a fixing block 26 is fixedly connected to one end of the connecting spring 25. The fixing block 26 slides inside the fixing slats 22, and the fixing block 26 and the fixing groove 34 are engaged with each other through the elastic force of the connecting spring 25, so that the fixing block 26 can be flexibly moved, so that the staff can quickly pull the protective cover shell 5, thereby adjusting the position of the protective cover shell 5 on the test machine 1, covering and protecting the tensile test area, avoiding the debris generated by the deformation and fracture of the metal bar from splashing everywhere, thereby improving the safety of the test, and through the covering and blocking of the protective cover shell 5, the splashing debris generated by the fracture of the metal bar can be concentrated and dropped on the chip dropping recess 3, so as to be collected and convenient for the staff to clean, and the staff can observe the stretching condition of the metal bar through the observation window 23.

[0035] The working principle of the present invention is:

[0036] During the test, the staff first pulls the protective cover 5 to one side of the test machine 1 through the handle 24, and then starts the electric push rod 13, so that the electric push rod 13 pushes the movable plate 14 to move in the clamping table 10. At this time, the limit plate 30 will slide in the limit groove 31, so as to prevent the movable plate 14 from being skewed during movement, and promote the movable plate 14 to move smoothly in the clamping table 10. When the movable plate 14 moves, the sliding rod 16 will slide in the second guide groove 15, and the two second guide grooves 15 that are skewed to each other to form a V-shaped structure can push the sliding rod 16, so as to promote the sliding block 17 to slide along the first guide groove 12, so that the two clamping plates 18 can move toward each other, so as to clamp the metal bar to be tested;

[0037] Then the staff member uses the hexagonal wrench to turn the connecting block 21 to rotate the threaded rod 19, so that the threaded rod 19 can push the clamping block 20 to move, so that the clamping block 20 can clamp and fix the metal bar. At this time, the rubber pad 29 will be squeezed and deformed, so as to fit with the metal bar, and the anti-skid pattern on the rubber pad 29 increases the friction between the rubber pad 29 and the bar to prevent the metal bar from slipping during the tensile test. Then, the protective cover 5 is pushed to make the fixed strip 22 slide in the guide slot 4. When the fixed strip 22 slides, the fixed block 26 will be pushed into the fixed strip 22 by the groove walls on both sides of the guide slot 4, so that the fixed block 26 can compress the connecting spring 25.

[0038] The elastic force of the connecting spring 25 rebounds to engage the fixing block 26 with the fixing groove 34, thereby fixing the position of the protective cover shell 5 on the test machine 1 to prevent the protective cover shell 5 from accidentally sliding, so that the protective cover shell 5 can cover and protect the tensile test area, and prevent the debris generated by the deformation and breakage of the metal bar from splashing everywhere, thereby improving the safety of the test. After that, the driving motor 7 is started to rotate the threaded screw 8, so that the movable table 9 drives the clamping table 10 to move along the threaded screw 8 through the thread cooperation of the guide sleeve 11 and the threaded screw 8, thereby stretching the metal bar in the horizontal direction, and the metal debris generated by the stretching deformation of the metal bar will directly fall on the chip dropping recess 3 to facilitate the staff to clean and collect it.

[0039] In the description of the present invention, it is necessary to understand that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present invention, unless otherwise clearly specified and limited, the first feature "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one scheme", "some schemes", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the scheme or example are included in at least one scheme or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same scheme or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more schemes or examples in a suitable manner.

Claims

1. A fixture for tensile testing of high carbon steel, comprising a test bench (1), characterized in that: The test machine platform (1) is fixedly connected to a hollow crossbeam (2), a chip removal concave platform (3) is arranged above the test machine platform (1), guide grooves (4) are provided on both sides of the test machine platform (1), a protective cover shell (5) is slidably installed on the test machine platform (1) through the guide grooves (4), a fixing frame (6) is fixedly connected to one side of the hollow crossbeam (2), a driving motor (7) is installed on the fixing frame (6), and a threaded screw (8) is connected to the output shaft of the driving motor (7); A movable platform (9) is installed on the threaded screw rod (8), and a clamping platform (10) is connected to one side of the movable platform (9) and the test machine platform (1), and a guide sleeve (11) is installed on the movable platform (9). A first guide groove (12) is provided on the clamping platform (10), and an electric push rod (13) is fixedly installed inside the clamping platform (10). A movable end of the electric push rod (13) is fixedly connected to a movable plate (14), and a second guide groove (15) is provided on the movable plate (14), and a sliding rod (16) is slidably connected in the second guide groove (15); A sliding block (17) is fixedly connected above the sliding rod (16), a clamping plate (18) is fixedly connected above the sliding block (17), a threaded rod (19) is threadedly connected to the clamping plate (18), one end of the threaded rod (19) is rotatably connected to a pressing block (20), and the other end of the threaded rod (19) is fixedly connected to a connecting block (21), fixed strips (22) are fixedly connected to both sides of the lower side of the protective cover shell (5), an observation window (23) is installed on the protective cover shell (5), and a handle (24) is fixedly connected to the protective cover shell (5).

2. A fixture for tensile testing of high carbon steel as claimed in claim 1, characterized in that: The protective cover shell (5) is designed to be U-shaped as a whole, and connecting springs (25) are fixedly connected inside the two ends of the fixed strip (22), and one end of the connecting spring (25) is fixedly connected to a fixing block (26), and the fixing block (26) slides inside the fixed strip (22).

3. A fixture for tensile testing of high carbon steel as claimed in claim 1, characterized in that: A guide cross bar (27) is fixedly connected inside the hollow cross beam (2), and the guide cross bar (27) is located directly above the threaded screw (8). A through hole (28) is provided on the movable platform (9), and the movable platform (9) is slidably connected to the guide cross bar (27) through the through hole (28), and the movable platform (9) is in contact with the inner wall of the hollow cross beam (2).

4. A fixture for tensile testing of high carbon steel as claimed in claim 1, characterized in that: There are two second guide grooves (15) in total and both are arranged skewed on the movable plate (14). The two skewed second guide grooves (15) mutually form a V-shaped structure. The sliding block (17) is T-shaped and slides in the first guide groove (12).

5. A fixture for tensile testing of high carbon steel as claimed in claim 1, characterized in that: A notch groove is provided on one side of the clamping plate (18), and the clamping block (20) is interlocked with the notch groove on one side of the clamping plate (18). One side of the clamping block (20) is arc-shaped and connected to a rubber pad (29), and the rubber pad (29) is provided with anti-slip grooves. The connecting block (21) is provided with a hexagonal groove.

6. A fixture for tensile testing of high carbon steel as claimed in claim 1, characterized in that: The interior of the clamping platform (10) is of hollow design, the movable plate (14) slides inside the clamping platform (10), both sides of the movable plate (14) are fixedly connected to limiting plates (30), and limiting grooves (31) are provided on the inner walls on both sides of the clamping platform (10), and the limiting plates (30) slide in the limiting grooves (31).

7. A fixture for tensile testing of high carbon steel as claimed in claim 1, characterized in that: The threaded screw (8) is rotatably connected in the hollow crossbeam (2), the guide sleeve (11) is threadably matched with the threaded screw (8), and support blocks (32) are fixedly connected at the four corners below the test machine (1), and an anti-slip pad (33) is connected below the support block (32).

8. A fixture for tensile testing of high carbon steel as claimed in claim 2, characterized in that: The fixed strip (22) is slidably connected to the guide slot (4), a plurality of fixed slots (34) are provided on the slot walls on both sides of the guide slot (4), and one side of the fixed block (26) is designed as a spherical curved surface and is embedded in the fixed slot (34).

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