Tension testing machine with high detection precision

Abstract

The utility model relates to a tensile testing machine with high detection precision, and belongs to the field of tensile detection, the tensile testing machine comprises two stand columns, a first connecting plate and a second connecting plate, the first connecting plate is fixedly connected with the two stand columns, the second connecting plate is slidably connected with the side walls, close to each other, of the two stand columns, and a driving part for driving the second connecting plate to move is arranged on the first connecting plate; clamping mechanisms which are oppositely arranged are fixedly connected to the first connecting plate and the second connecting plate, each clamping mechanism comprises a connecting plate connected with the first connecting plate or the second connecting plate, the connecting plate is fixedly connected with a first clamping plate and a second clamping plate which is oppositely arranged with the first clamping plate, and a clamping moving part is arranged on the second clamping plate; a first limiting assembly used for limiting the position of the steel plate is arranged on the side, close to the second clamping plate, of the first clamping plate and comprises two oppositely-arranged clamping blocks, and a limiting driving piece for driving the two clamping blocks to move is arranged on one side of the first clamping plate. The clamping device has the effect that the rectangular plate is kept in a vertical state in the clamping process.

Description

Technical Field

[0001] The present application relates to the field of tensile testing, and in particular to a tensile testing machine with high detection accuracy. Background Art

[0002] Tensile testing machine is also known as universal material testing machine. Universal testing machine is a mechanical force testing machine used to test the mechanical properties of various materials such as static load, stretching, compression, bending, shearing, tearing, peeling, etc. It is suitable for various physical and mechanical properties of materials such as plastic plates, pipes, special-shaped materials, plastic films, rubber, wires and cables, steel, glass fiber, etc. The test is an indispensable testing equipment for material development, physical property testing, teaching research, quality control, etc.

[0003] The existing Chinese utility model patent with authorization announcement number CN213842865U discloses a single-column high-precision electronic tensile testing machine, including an upper clamping assembly and a lower clamping assembly, the upper clamping assembly includes a connecting block, the lower surface of the connecting block is connected to a fixed block, the lower surface of the fixed block is provided with a clamping mechanism, the clamping mechanism includes a fixed plate and a movable plate, a motor is installed inside the fixed plate, a threaded groove is provided on the side of the movable plate close to the fixed plate, a threaded rod is threadedly connected to the thread in the threaded groove, one end of the threaded rod passes through the threaded groove and is fixedly connected to the output shaft of the motor, a blocking block is fixedly installed on the end of the threaded rod away from the motor, and the structural composition and connection method of the lower clamping assembly are the same as those of the upper clamping assembly.

[0004] When performing a tensile test on a rectangular plate or other plate, the rectangular plate is first placed between the fixed plate and the movable plate of the upper clamping assembly, the motor is started to drive the lead screw to rotate, and the rotation of the lead screw drives the movable plate to move in the direction close to the fixed plate, thereby clamping the rectangular plate between the movable plate and the fixed plate, and then the driver drives the connecting rod to move upward, and the lower end of the rectangular plate is placed between the fixed plate and the movable plate of the lower clamping assembly, the motor is started to drive the lead screw to rotate, and the rotation of the lead screw drives the movable plate to move in the direction close to the fixed plate, thereby clamping the lower end of the rectangular plate, and then the driver is started again to drive the connecting rod to move downward, and the movable plate and the fixed plate of the lower clamping assembly clamp the lower end of the rectangular plate and move downward, thereby stretching the rectangular plate.

[0005] With respect to the above-mentioned related technologies, the inventors found that when placing the rectangular plate between the fixed plate and the movable plate of the upper clamping assembly, the staff could not observe whether the upper surface of the rectangular plate was in a horizontal state after the rectangular plate entered between the fixed plate and the movable plate. Simply relying on the staff's sense to place the rectangular plate is prone to errors, causing the rectangular plate to be in a tilted state during the test, resulting in inaccurate test results of the tensile testing machine. Utility Model Content

[0006] In order to keep the rectangular plate in a vertical state during the clamping process, the present application provides a tensile testing machine with high detection accuracy.

[0007] The present application provides a tensile testing machine with high detection accuracy, which adopts the following technical solutions:

[0008] 14. The swiftly and minutely adjusting device for a wood-planer working table as claimed in claim 13, wherein the first and second connecting plates are respectively provided with a toothed structure and a pair of toothed structures. The toothed structure comprises a first wheel and a second wheel. The wheeled structure comprises a first wheel and a pair of toothed structures. The first wheel and the second wheel are respectively provided with a toothed structure and a pair of toothed structures. The first wheel and the second wheel are respectively provided with a toothed structure and a pair of toothed structures.

[0009] By adopting the above technical scheme, when it is necessary to detect the tensile strength of the rectangular plate, first place the two ends of the rectangular plate in the clamping mechanism located between the two columns, and then place one side of the rectangular plate between the two clamping blocks located on one side of the first clamping plate, and then start the limit moving component, the limit moving component drives the clamping block to move, and clamps the rectangular plate, and then start the clamping moving component, the clamping moving component drives the second clamping plate to move toward the side close to the first clamping plate, thereby clamping the rectangular plate, and limiting the rectangular plate by two clamping blocks, thereby reducing the inaccurate measurement of the tensile strength of the rectangular plate caused by the inclination of the rectangular plate when the first clamping plate and the second clamping plate are clamped.

[0010] Optionally, a first slide groove is provided on one side of the first splint close to the second splint, the two clamping blocks are located inside the first slide groove and are slidably connected to the inner wall of the first slide groove, and the two sides of the two clamping blocks close to each other and one end close to the second splint are both set as inclined surfaces.

[0011] By adopting the above technical solution, when the rectangular plate needs to be placed in the middle of the two clamps, since the side of the two clamps close to each other is set as an inclined surface, the work efficiency when placing the rectangular plate is accelerated and the trouble of manually adjusting the inclination angle of the rectangular plate is reduced.

[0012] Optionally, the limit drive component includes a bidirectional screw rotatably connected to the first clamping plate on the side close to the second clamping plate, the bidirectional screw passes through the two clamping blocks and is threadedly connected to the two clamping blocks, one end of the bidirectional screw passes through the first clamping plate and is provided with a locking component for locking the bidirectional screw.

[0013] By adopting the above technical solution, after placing the rectangular plate between the two clamping blocks, the bidirectional lead screw is rotated, and the bidirectional lead screw drives the two clamping blocks to move toward the side close to each other to clamp the rectangular plate. By driving the clamping blocks to move by the bidirectional lead screw, on the one hand, the rectangular plate between the two clamping blocks can be clamped more effectively, and on the other hand, the rectangular plate can be located in the middle position of the first clamping plate, so that the measurement result is more accurate and the occurrence of uneven force caused by the offset of the position of the rectangular plate is reduced.

[0014] Optionally, the locking member includes a locking ratchet fixedly sleeved on the bidirectional lead screw and penetrating one end of the first clamping plate, and a locking pawl meshing with the locking ratchet is installed on one side of the first clamping plate close to the locking ratchet.

[0015] By adopting the above technical solution, after the two-way bolt drives the clamping block to clamp the rectangular plate, the locking ratchet at one end of the two-way bolt abuts against the locking pawl, thereby reducing the occurrence of the rectangular plate detaching from the clamping block due to the reverse rotation of the two-way screw.

[0016] Optionally, lifting grooves are provided on both sides of the two columns close to each other, and the two ends of the second connecting plate are respectively located in the lifting grooves on both sides, and the driving member includes a plurality of lifting hydraulic cylinders located on the side of the first connecting plate away from the clamping mechanism, and the piston rod of the lifting hydraulic cylinder is fixedly connected to the part of the second connecting plate located in the lifting groove.

[0017] By adopting the above technical solution, after the rectangular plate is clamped by the clamping assembly and the clamping block, the lifting hydraulic cylinder is started, and the lifting hydraulic cylinder drives the second connecting plate to move to the side away from the first connecting plate, so as to measure the tensile performance of the rectangular plate. Pulling the rectangular plate by the lifting hydraulic cylinder can reduce the operating difficulty of the staff in the process of stretching the rectangular plate, thereby further increasing the work efficiency of the entire measurement process.

[0018] Optionally, an accordion plate is installed on one side of the two lifting slots close to the clamping assembly.

[0019] By adopting the above technical solution, during the detection process, the rectangular plate needs to be pulled until it breaks. Therefore, when the rectangular plate breaks, the debris on the rectangular plate will splash. The presence of the accordion plate can reduce the occurrence of rectangular plate debris falling into the lifting slot, thereby reducing the trouble of cleaning for the measurement personnel.

[0020] Optionally, a second slide groove is provided on one side of the second clamping plate close to the first clamping plate, and a second limit assembly is also provided inside the second slide groove. The second limit assembly includes two relatively arranged limit blocks which are slidably connected to the inner side wall of the second slide groove, and pressure springs are fixedly connected to the two sides of the two limit blocks which are away from each other, and the side of the pressure spring which is away from the limit blocks is fixedly connected to the inner side wall of the second slide groove.

[0021] By adopting the above technical solution, after one side of the rectangular plate is limited by two clamping blocks, in the process of moving the second clamping plate close to the first clamping plate, the side of the rectangular plate away from the clamping block is inserted between the two limit blocks. Then, under the action of the pressure spring, the two limit blocks approach each other to limit the rectangular plate located between the two limit blocks, thereby further reducing the occurrence of inaccurate measurement results caused by the offset of the rectangular plate.

[0022] Optionally, a side where the two limit blocks are close to each other and one end away from the inner side wall of the second sliding groove is set as an inclined surface.

[0023] By adopting the above technical solution, when the rectangular plate is inserted into the middle position of the two limit blocks, since the part where the rectangular plate first contacts the two limit blocks is set as an inclined surface, the occurrence of damage to the surface of the rectangular plate caused by the contact between the rectangular plate and the limit blocks during the insertion process is reduced.

[0024] Optionally, the clamping movable member includes a clamping screw, one end of which passes through the second clamping plate and is threadedly connected to the second clamping plate, the other end of which is rotatably connected to the first clamping plate, and a driving motor is provided on one side of the first clamping plate, and the output shaft of the driving motor is fixedly connected to the clamping screw.

[0025] By adopting the above technical solution, when the second clamping plate needs to be moved, the driving motor is started, the driving motor drives the clamping screw to rotate, and the clamping screw drives the second clamping plate to move to the side close to the first clamping plate, so that the second clamping plate and the first clamping plate cooperate with each other to clamp the rectangular plate. By driving the second clamping plate to move by the driving motor, the labor cost required for the staff to move the second clamping plate is reduced.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. Through the cooperation of the two clamping blocks, the rectangular plate can be in a vertical state before clamping, thereby increasing the accuracy of the measurement results;

[0028] 2. Due to the presence of the second limiting assembly on the second clamping plate, when the second clamping plate and the first clamping plate clamp the rectangular plate, the second limiting assembly further limits the rectangular plate, thereby reducing the occurrence of the rectangular plate position deviation phenomenon;

[0029] 3. By installing accordion plates in the lifting grooves of the columns on both sides, it is possible to reduce the splashing of rectangular plate debris into the lifting grooves, which would make it difficult for surveyors to clean up. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0031] Figure 2 It is a schematic diagram of the half-section structure of an embodiment of the present application.

[0032] Figure 3 It is a schematic diagram of the clamping mechanism structure of an embodiment of the present application.

[0033] Figure 4 It is a structural schematic diagram of the connection relationship between the locking member and the bidirectional lead screw in an embodiment of the present application.

[0034] Figure 5 It is a schematic diagram of the half-section structure of the clamping mechanism of an embodiment of the present application.

[0035] Description of reference numerals: 1, column; 11, lifting groove; 12, accordion plate; 13, first connecting plate; 14, second connecting plate; 141, lifting hydraulic cylinder; 2, clamping mechanism; 3, clamping assembly; 31, connecting plate; 311, slide groove; 312, support plate; 32, first clamping plate; 321, first groove; 3211, limit slide groove; 322, placement groove; 33, second clamping plate; 331, second groove; 3311, slide Shift groove; 332, slider; 34, clamping movable part; 341, clamping screw; 3411, limit plate; 342, driving motor; 4, first limit assembly; 41, clamping block; 411, limit slider; 42, limit driving part; 421, bidirectional screw; 422, locking ratchet; 423, locking pawl; 424, handle; 5, second limit assembly; 51, limit block; 511, sliding block; 52, pressure spring. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1 -Attached Figure 5 This application is described in further detail.

[0037] The present application embodiment discloses a tensile testing machine with high detection accuracy. Figure 1 and Figure 2A tensile testing machine with high detection accuracy comprises two columns 1, the upper ends of the two columns 1 are fixedly connected with a first connecting plate 13, a second connecting plate 14 is arranged between the two columns 1, vertically arranged lifting grooves 11 are opened on both sides of the two columns 1 close to each other, and the outsides of the two lifting grooves 11 are fixedly connected with accordion plates 12 for blocking the lifting grooves 11, the two ends of the second connecting plate 14 respectively penetrate the accordion plates 12 and are fixedly connected to the accordion plates 12, the two ends of the second connecting plate 14 penetrate the accordion plates 12 and are respectively slidably connected to the inner side walls of the two lifting grooves 11, the first connecting plate 13 and the second connecting plate 14 are spaced a certain distance apart, and a driving member is arranged on the side of the first connecting plate 13 away from the second connecting plate 14, and the driving member is set to two lifting hydraulic cylinders 141, the two lifting hydraulic cylinders 141 are evenly distributed at the two ends of the first connecting plate 13, and the piston rods of the two lifting hydraulic cylinders 141 penetrate the first connecting plate 13 and are respectively fixedly connected to the ends of the second connecting plate 14.

[0038] A clamping mechanism 2 is provided on one side of the first connecting plate 13 close to the second connecting plate 14 , and a clamping mechanism 2 with the same structure and arranged in the opposite direction is provided on one end of the second connecting plate 14 close to the first connecting plate 13 .

[0039] Reference Figure 3 and Figure 4 The clamping mechanism 2 includes a support plate 312 fixedly connected to the first connecting plate 13 or the second connecting plate 14, the support plate 312 is vertically arranged with the first connecting plate 13 or the second connecting plate 14, one end of the support plate 312 away from the first connecting plate 13 or the second connecting plate 14 is fixedly connected with a connecting plate 31, one end of the connecting plate 31 away from the side of the support plate 312 is fixedly connected with a first clamping plate 32, the first clamping plate 32 is vertically arranged with the connecting plate 31, and one end of the connecting plate 31 away from the side of the support plate 312 and away from the first clamping plate 32 is provided with a second clamping plate 32 3, the center line of the second clamping plate 33 is arranged parallel to the center line of the first clamping plate 32, a slider 332 is fixedly connected to the side of the second clamping plate 33 close to the connecting plate 31, a sliding groove 311 for placing the slider 332 is opened on the side of the connecting plate 31 close to the second connecting plate 14, the sliding groove 311 is opened along the side close to the second clamping plate 33 to the side close to the first clamping plate 32, and the outer wall of the slider 332 is slidably connected to the inner wall of the sliding groove 311. In this embodiment, the shape of the slider 332 is preferably a T-shaped slider 332.

[0040] Reference Figure 3 and Figure 5The second clamping plate 33 is provided with a clamping movable member 34 for driving the second clamping plate 33 to move, and the clamping movable member 34 includes a clamping screw 341 located between the first clamping plate 32 and the second clamping plate 33, and the clamping screw 341 is vertically arranged to the first clamping plate 32, one end of the clamping screw 341 passes through the second clamping plate 33 and is threadedly connected to the second clamping plate 33, one end of the clamping screw 341 passes through the second clamping plate 33 and is fixedly connected to the limiting plate 3411, and the end of the clamping screw 341 away from the second clamping plate 33 is rotatably connected to the first clamping plate 32, and a placement groove 322 is opened on the side of the first clamping plate 32 away from the clamping screw 341, and the inner side wall of the placement groove 322 is fixedly connected to a driving motor 342, and the output shaft of the driving motor 342 passes through the first clamping plate 32 and is fixedly connected to the clamping screw 341.

[0041] When it is necessary to clamp the rectangular plate, first place the two ends of the rectangular plate between the first clamping plate 32 and the second clamping plate 33 located on the first connecting plate 13 and the second connecting plate 14, then start the drive motor 342, the drive motor 342 drives the clamping screw 341 to rotate, the clamping screw 341 rotates and drives the second clamping plate 33 threadedly connected to it to move toward the side close to the first clamping plate 32, thereby clamping the rectangular plate located between the first clamping plate 32 and the second clamping plate 33, then start the lifting hydraulic cylinder 141 to drive the second connecting plate 14 to move toward the side away from the first connecting plate 13, thereby realizing the detection of the tensile performance of the rectangular plate.

[0042] Reference Figure 3 and Figure 5 A first groove 321 is provided on one side of the first clamping plate 32 close to the second clamping plate 33, and a first limiting component 4 is provided inside the first groove 321. The first limiting component 4 includes a block 41 at one end of which is located inside the first groove 321 and is slidably connected to the inner side wall of the first groove 321. Two blocks 41 are provided, and the two blocks 41 are arranged opposite to each other. The width of the two blocks 41 is greater than the depth of the first groove 321. Both sides of the two blocks 41 away from one end of the connecting plate 31 and close to each other are set as inclined surfaces, and the two inclined surfaces gradually incline from the side close to the connecting plate 31 to the side away from the connecting plate 31 toward the two sides of the two blocks 41 away from each other.

[0043] The two clamping blocks 41 are fixedly connected to the limiting slider 411 on one side of the inner side wall close to the first groove 321. The inner side wall of the first groove 321 is provided with a limiting slide groove 3211 for placing the limiting slider 411. The outer side wall of the limiting slider 411 is slidably connected to the inner side wall of the limiting slide groove 3211. In this embodiment, the limiting slider 411 is preferably T-shaped. The length direction of the limiting slide groove 3211 is perpendicular to the center line of the clamping block 41.

[0044] A limit drive member 42 is also provided on one side of the first clamping plate 32, and the limit drive member 42 includes a bidirectional lead screw 421, the center line of which is parallel to the first clamping plate 32, the bidirectional lead screw 421 is located inside the first groove 321 and the two ends of the bidirectional lead screw 421 are rotatably connected to the inner side wall of the first groove 321, the bidirectional lead screw 421 passes through the two blocks 41 located inside the first groove 321, and the bidirectional lead screw 421 is threadedly connected to the two blocks 41.

[0045] Reference Figure 4 and Figure 5 One end of the bidirectional screw 421 passes through the first clamping plate 32, and a locking piece is provided at one end of the bidirectional screw 421 passing through the first clamping plate 32. The locking piece includes a locking ratchet 422 sleeved on one end of the bidirectional screw 421 passing through the first clamping plate 32, and a locking pawl 423 is installed on one side of the first clamping plate 32. The locking pawl 423 engages with the locking ratchet 422, and a handle 424 is fixedly connected to the end of the bidirectional screw 421 passing through the first clamping plate 32.

[0046] Before clamping the rectangular plate by the first clamping plate 32 and the second clamping plate 33, first place one side of the rectangular plate into the middle position of the two clamping blocks 41 along the inclined surfaces of the two clamping blocks 41, and then turn the handle 424, the handle 424 drives the bidirectional screw 421 to rotate, and the bidirectional screw 421 drives the two clamping blocks 41 to move toward each other, thereby clamping the rectangular plate located in the middle position of the two clamping blocks 41. When the clamping block 41 clamps the rectangular plate, the rectangular plate can be kept in a vertical state between the first clamping plate 32 and the second clamping plate 33, so that the measurement result is more accurate.

[0047] A second groove 331 is provided on one side of the second clamping plate 33 close to the first clamping plate 32, and a second stopper assembly 5 is provided inside the second groove 331. The second stopper assembly 5 includes two stopper blocks 51. A sliding block 511 is fixedly connected to one side of the stopper block 51 close to the inner side wall of the second groove 331. A sliding groove 3311 is provided on the inner side wall of the second groove 331 for the sliding block 511 to be placed. The sliding block 511 is slidably connected to the inner side wall of the sliding groove 3311, and the length direction of the sliding groove 3311 is perpendicular to the center line of the stopper block 51. Pressure springs 52 are fixedly connected to the two sides of the two stopper blocks 51 away from each other, and one end of the two pressure springs 52 away from the stopper blocks 51 is fixedly connected to the inner side wall of the second groove 331.

[0048] The two ends of the two stoppers 51 that are away from the second groove 331 and close to each other are arranged as inclined surfaces, and the inclined surfaces gradually incline from the side close to the inner side wall of the second groove 331 to the side away from the inner side wall of the second groove 331 toward the two sides of the two stoppers 51 that are away from each other. The width of the stopper 51 is greater than the depth of the second groove 331, and the inclined surface portion of the stopper 51 is located outside the second groove 331.

[0049] After the rectangular plate is clamped by the first limiting assembly 4, the driving motor 342 is started to drive the second clamping plate 33 to move toward the side close to the first clamping plate 32, so that the side of the rectangular plate away from the clamping block 41 is inserted into the middle position of the two limiting blocks 51, and then under the elastic force of the pressure spring 52, the two limiting blocks 51 clamp the rectangular plate located in the middle position of the two limiting blocks 51 toward the middle, thereby further limiting the rectangular plate.

[0050] The implementation principle of a tensile testing machine with high detection accuracy in an embodiment of the present application is: first, a rectangular plate is vertically placed in the middle position of two columns 1, and then the two ends of one side of the rectangular plate are placed between the two blocks 41 located on the first connecting plate 13 and the second connecting plate 14, and then the handle 424 is turned to make the two sides of the two blocks 41 close to each other abut against the rectangular plate.

[0051] Then, the driving motor 342 is started, and the driving motor 342 drives the second clamping plate 33 to move toward the side close to the first clamping plate 32. Then, the side of the rectangular plate away from the clamping block 41 is inserted into the middle position of the limit block 51, and the limit block 51 is pushed by the pressure spring 52 to further limit the rectangular plate, so that the rectangular plate is in a vertical state, and the rectangular plate is clamped by the first clamping plate 32 and the second clamping plate 33.

[0052] Then, the lifting hydraulic cylinder 141 is started, and the lifting hydraulic cylinder 141 drives the second connecting plate 14 to move to a side away from the first connecting plate 13, thereby realizing the measurement of the tensile strength of the rectangular plate.

[0053] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A tensile testing machine with high detection accuracy, characterized in that: The invention comprises two upright posts (1), a first connecting plate (13) and a second connecting plate (14), wherein the first connecting plate (13) is fixedly connected to the two upright posts (1), and the second connecting plate (14) is slidably connected to the side walls of the two upright posts (1) that are close to each other, and the first connecting plate (13) is provided with a driving member for driving the second connecting plate (14) to move, and the first connecting plate (13) and the second connecting plate (14) are fixedly connected to oppositely arranged clamping mechanisms (2) on both sides that are close to each other, and the clamping mechanism (2) comprises a clamping assembly (3), and the clamping assembly (3) comprises a clamping member connected to the first connecting plate (13) or the second connecting plate (14). A connecting plate (31), wherein the connecting plate (31) is fixedly connected to a first clamping plate (32), and a second clamping plate (33) is slidably connected to the connecting plate (31) at a relative position to the first clamping plate (32), and the second clamping plate (33) is provided with a clamping movable member (34) for driving the second clamping plate (33) to move, and a first limiting component (4) for limiting the position of the rectangular plate is provided on a side of the first clamping plate (32) close to the second clamping plate (33), and the first limiting component (4) includes two relatively arranged clamping blocks (41), and a limiting driving member (42) for driving the two clamping blocks (41) to move is provided on one side of the first clamping plate (32).

2. A tensile testing machine with high detection accuracy according to claim 1, characterized in that: A sliding groove (311) is provided on one side of the first clamping plate (32) close to the second clamping plate (33); the two clamping blocks (41) are located inside the sliding groove (311) and are slidably connected to the inner side wall of the sliding groove (311); and the two sides of the two clamping blocks (41) close to each other and one end close to the second clamping plate (33) are both arranged as inclined surfaces.

3. A tensile testing machine with high detection accuracy according to claim 2, characterized in that: The limit drive component (42) includes a bidirectional lead screw (421) rotatably connected to the first clamping plate (32) near the second clamping plate (33), the bidirectional lead screw (421) passes through the two clamping blocks (41) and is threadedly connected to the two clamping blocks (41), and one end of the bidirectional lead screw (421) passes through the first clamping plate (32) and is provided with a locking component for locking the bidirectional lead screw (421).

4. A tensile testing machine with high detection accuracy according to claim 3, characterized in that: The locking member comprises a locking ratchet (422) fixedly sleeved on the bidirectional lead screw (421) and penetrating one end of the first clamping plate (32); a locking pawl (423) meshing with the locking ratchet (422) is installed on one side of the first clamping plate (32) close to the locking ratchet (422).

5. A tensile testing machine with high detection accuracy according to claim 1, characterized in that: Both sides of the two columns (1) close to each other are provided with lifting grooves (11), and the two ends of the second connecting plate (14) are respectively located in the lifting grooves (11) on both sides. The driving member includes a plurality of lifting hydraulic cylinders (141) located on the side of the first connecting plate (13) away from the clamping mechanism (2), and the piston rod of the lifting hydraulic cylinder (141) is fixedly connected to the part of the second connecting plate (14) located in the lifting groove (11).

6. A tensile testing machine with high detection accuracy according to claim 5, characterized in that: An accordion plate (12) is installed on one side of the two lifting slots (11) close to the clamping assembly (3).

7. A tensile testing machine with high detection accuracy according to claim 1, characterized in that: A slide groove (311) is provided on one side of the second clamping plate (33) close to the first clamping plate (32), and a second limit assembly (5) is also provided inside the slide groove (311). The second limit assembly (5) includes two relatively arranged limit blocks (51) slidably connected to the inner side wall of the slide groove (311), and pressure springs (52) are fixedly connected to the two sides of the two limit blocks (51) away from each other, and the side of the pressure spring (52) away from the limit blocks (51) is fixedly connected to the inner side wall of the slide groove (311).

8. A tensile testing machine with high detection accuracy according to claim 7, characterized in that: One end of the two limit blocks (51) that is close to each other and away from the inner wall of the sliding groove (311) is arranged as an inclined surface.

9. A tensile testing machine with high detection accuracy according to claim 1, characterized in that: The clamping movable member (34) includes a clamping screw (341), one end of which passes through the second clamping plate (33) and is threadedly connected to the second clamping plate (33), and the other end of the clamping screw (341) is rotatably connected to the first clamping plate (32). A driving motor (342) is provided on one side of the first clamping plate (32), and the output shaft of the driving motor (342) is fixedly connected to the clamping screw (341).

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