The structure of unloading stripped bolts in the torque coefficient test of high-strength bolts

Abstract

The present invention discloses a structure for unloading a threaded bolt in a high-strength bolt torque coefficient test, comprising a nut baffle, an unloading cylinder provided on the top of the nut baffle, a sealing door installed on the front end surface of the unloading cylinder, a first threaded tube fixedly connected to the top of the nut baffle, a rotating handle fixedly connected to the outer walls of both sides of the first threaded tube, an unloading seat fixedly connected to the inner wall of the bottom end of the unloading cylinder, an unloading groove provided on the top of the unloading seat, a through hole provided at the bottom center of the unloading groove and the center of the nut baffle, a test bolt inserted into the groove, a test nut threadedly connected to the test bolt, an unloading mechanism provided above the unloading seat, and a clamping mechanism provided at the bottom of the nut baffle. The present invention can effectively solve the problem of threaded bolts being difficult to unload in a high-strength bolt torque coefficient test, saves time and effort, has low labor intensity, and has high stability and is not easy to slip.

Description

Technical Field

[0001] The invention relates to the technical field of high-strength bolts, in particular to a structure for unloading a stripped bolt in a high-strength bolt torque coefficient test. Background Art

[0002] High-strength bolts are bolts made of high-strength steel or require a high preload. High-strength bolts are commonly used in bridges, railroads, and high- and ultra-high-voltage equipment. These bolts typically fracture due to brittle fracture. High-strength bolts used in ultra-high-voltage equipment require a high preload to ensure a sealed container.

[0003] After production, high-strength bolts need to be tested for their torque coefficient. Current high-strength bolt torque coefficient testing often results in thread slippage in substandard bolts, making it impossible to remove the slipped bolts. This, in turn, impacts subsequent high-strength bolt torque coefficient testing. Therefore, a structure for removing slipped bolts during high-strength bolt torque coefficient testing is proposed to address this issue. Summary of the Invention

[0004] The technical problem solved by the present invention is to overcome the defects of the prior art and provide a structure for unloading a stripped bolt in a torque coefficient test of a high-strength bolt.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a structure for unloading a threaded bolt in a torque coefficient test of a high-strength bolt, comprising a nut baffle, an unloading cylinder provided on the top of the nut baffle, a sealing door installed on the front end surface of the unloading cylinder, a plurality of positioning holes provided at the bottom edge thereof, positioning bolts inserted into the positioning holes, a plurality of thread grooves matching the positioning bolts provided on the top surface of the nut baffle, a first threaded tube fixedly connected to the top of the unloading cylinder, a rotating handle fixedly connected to both sides of the outer wall of the first threaded tube, a movable groove provided on both sides of the cylinder wall surface of the unloading cylinder, and an unloading seat fixedly connected to the bottom inner wall of the unloading cylinder, an unloading groove provided on the top of the unloading seat, the unloading groove is circular, a through hole is provided at the center of the bottom thereof and the center of the nut baffle, a test bolt is inserted into the unloading groove, the bottom end of the test bolt passes through the through hole and extends to the bottom of the nut baffle, and a test nut matching therewith is threadedly connected to the test bolt, an unloading mechanism is provided above the unloading seat, and a clamping mechanism is provided at the bottom of the nut baffle.

[0006] Preferably, the unloading mechanism includes a first threaded rod, which is threadedly connected in the first threaded tube, and the top end of the first threaded rod is fixedly connected to a crank, and the bottom end of the first threaded rod is provided with a pressure plate, and the pressure plate is located in the unloading cylinder, and the bottom end thereof is fixedly connected to a pressure block, and the side walls on both sides of the pressure plate are fixedly connected to moving blocks, and the moving block passes through the moving groove and extends to the outside of the unloading cylinder, and the top end thereof is fixedly connected to a first spring, and the top end of the first spring is fixedly connected to a fixed block, and the fixed block is fixedly connected to the top outer wall of the unloading cylinder.

[0007] Preferably, the cross section of the pressing block is circular, the diameter of which is equal to the diameter of the unloading groove, and the bottom of the pressing block is engraved with herringbone anti-slip grooves.

[0008] Preferably, a slot is provided on the top surface of the pressure plate, the slot is circular, the diameter of the slot is equal to the diameter of the first threaded rod, and the center of the slot and the first threaded rod are located on the same straight line.

[0009] Preferably, the clamping mechanism includes a fixed tube, which is fixedly connected to the bottom of the nut baffle, and a plurality of second threaded tubes are fixedly connected to its tube wall, and a second threaded rod is threadedly connected to the inner thread of the second threaded tube. A plurality of clamping blocks are arranged in the fixed tube, and the number of the clamping blocks is the same as the number of the second threaded tubes. A transmission frame is fixedly connected to the side close to the inner wall of the fixed tube, and a second spring is fixedly connected between the clamping block and the inner wall of the fixed tube, and the second spring is symmetrically arranged with respect to the transmission frame. The end of the second threaded rod passes through the transmission frame and is fixedly connected to the transmission block, and the transmission block is located in the transmission frame.

[0010] Preferably, the clamping block is arc-shaped and arranged in a ring shape with the test nut as the center, and the arc-shaped inner wall surface of each clamping block is provided with a layer of anti-slip pad, and the surface of the anti-slip pad is engraved with herringbone anti-slip patterns.

[0011] Preferably, the rotating handle is covered with an anti-slip cover, which is a silicone cover structure, and a plurality of hemispherical protrusions are evenly arranged on the surface of the anti-slip cover.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. The present invention can remove a bolt that has stripped threads during the high-strength bolt torque coefficient test from the corresponding nut through the mutual cooperation between the various components in the unloading mechanism, so as to complete the bolt unloading work, saving time and effort, and having low labor intensity, and effectively solving the problem that stripped bolts cannot be easily unloaded during the high-strength bolt torque coefficient test;

[0014] 2. The present invention can clamp the test nut matched with the test bolt through the mutual cooperation between the various components in the clamping mechanism, so as to improve the stability of the test nut, thereby preventing it from slipping during the unloading process and affecting the unloading of the stripped bolt;

[0015] 3. The present invention can lock the test bolt in place through the cooperation of the unloading groove and the through hole, thereby improving the stability of the test bolt and preventing it from slipping during unloading. In addition, the test bolt can be pressed and fixed by the pressure block in the unloading mechanism to facilitate subsequent unloading work.

[0016] 4. The present invention can drive the first threaded tube to rotate together with the unloading cylinder by rotating the handle to perform the unloading work of the test bolt, and the anti-slip sleeve can effectively increase the friction between the human hand and the handle to prevent slipping and slipping. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional diagram of the external structure of the present invention;

[0018] Figure 2 It is a front structural cross-sectional view of the present invention;

[0019] Figure 3 A bottom view of the nut baffle and the clamping mechanism;

[0020] Figure 4 It is a top view of the unloading cylinder.

[0021] Numbers in the figure: 1. nut baffle; 2. unloading cylinder; 3. positioning hole; 4. positioning bolt; 5. threaded groove; 6. first threaded tube; 7. turning handle; 8. moving groove; 9. unloading seat; 10. unloading groove; 11. through hole; 12. test bolt; 13. test nut; 14. first threaded rod; 15. crank; 16. pressure plate; 17. pressure block; 18. moving block; 19. first spring; 20. fixed block; 21. slot; 22. fixed tube; 23. second threaded tube; 24. second threaded rod; 25. clamping block; 26. transmission frame; 27. second spring; 28. transmission block; 29. ​​anti-slip pad; 30. anti-slip sleeve; 31. sealing door. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0023] See also Figure 1-4The present invention provides a technical solution: a structure for unloading a threaded bolt in a high-strength bolt torque coefficient test, comprising a nut baffle 1, an unloading cylinder 2 is provided on the top of the nut baffle 1, a sealing door 31 is installed on the front end surface of the unloading cylinder 2, a plurality of positioning holes 3 are provided at the bottom edge thereof, positioning bolts 4 are inserted into the positioning holes 3, a plurality of thread grooves 5 are provided on the top surface of the nut baffle 1 to match the positioning bolts 4, the ends of the positioning bolts 4 can be screwed into the corresponding thread grooves 5, the unloading cylinder 2 can be fixedly installed on the nut baffle 1 through the mutual cooperation between the positioning bolts 4 and the thread grooves 5, and the top of the unloading cylinder 2 is fixedly connected to a first threaded tube 6 , the outer walls of both sides of the first threaded tube 6 are fixedly connected with a turning handle 7, the surfaces of the cylinder walls on both sides of the unloading cylinder 2 are provided with a movable groove 8, and the inner wall of the bottom end of the unloading cylinder 2 is fixedly connected with an unloading seat 9, and the top of the unloading seat 9 is provided with an unloading groove 10, the unloading groove 10 is circular, and a through hole 11 is provided at the center of its bottom and the center of the nut baffle 1, and a test bolt 12 is inserted into the unloading groove 10, the bottom end of the test bolt 12 passes through the through hole 11 and extends to the bottom of the nut baffle 1, and a test nut 13 matched with it is threadedly connected to the test bolt 12, an unloading mechanism is provided above the unloading seat 9, and a clamping mechanism is provided at the bottom of the nut baffle 1;

[0024] The unloading mechanism includes a first threaded rod 14, which is threadedly connected to the first threaded tube 6, and a crank 15 is fixedly connected to the top thereof, and a pressure plate 16 is provided at the bottom end of the first threaded rod 14, which is located in the unloading cylinder 2, and a pressure block 17 is fixedly connected to the bottom thereof, and both side walls of the pressure plate 16 are fixedly connected to moving blocks 18, which pass through the moving groove 8 and extend to the outside of the unloading cylinder 2, and a first spring 19 is fixedly connected to the top thereof, and a fixed block 20 is fixedly connected to the top outer wall of the unloading cylinder 2, and the first threaded rod 14 can be driven to move downward along the first threaded tube 6 by rotating the crank 15. When the bottom end of the first threaded rod 14 contacts the pressure plate 16, the pressure plate 16 can be driven to move downward and stretch the first spring 19 until the pressure block 17 is inserted into the unloading groove 10. When the pressure block 17 is inserted into the unloading groove 10, it can be tightly pressed against the top of the test bolt 12. At this time, the test bolt 12 can be pressed and fixed by the pressure block 17 for subsequent unloading work. The cross section of the pressure block 17 is circular, and its diameter is equal to the diameter of the unloading groove 10. The bottom of the pressure block 17 is engraved with a herringbone anti-skid pattern, which can increase the friction between the pressure block 17 and the test bolt 12, so as to improve the stability of the test bolt 12, thereby preventing it from slipping during unloading;

[0025] A slot 21 is formed on the top surface of the pressure plate 16. The slot 21 is circular and has a diameter equal to the diameter of the first threaded rod 14. The slot 21 and the center of the first threaded rod 14 are located on the same straight line. The bottom end of the first threaded rod 14 can be inserted into the slot 21. The slot 21 can be used to lock the first threaded rod 14 in place to prevent it from shifting.

[0026] The clamping mechanism includes a fixed tube 22, which is fixedly connected to the bottom of the nut baffle 1, and a plurality of second threaded tubes 23 are fixedly connected to its tube wall, and a second threaded rod 24 is connected to the inner thread of the second threaded tube 23. A plurality of clamping blocks 25 are provided in the fixed tube 22, and the number of the clamping blocks 25 is the same as that of the second threaded tube 23. A transmission frame 26 is fixedly connected to the side close to the inner wall of the fixed tube 22, and a second spring 27 is fixedly connected between the clamping block 25 and the inner wall of the fixed tube 22. The second spring 27 is symmetrically arranged with respect to the transmission frame 26. The end of the second threaded rod 24 passes through the transmission frame 26 and is fixedly connected to the transmission block 28. The transmission block 28 is located in the transmission frame 26. By rotating the second threaded rod 24, it can be moved along the second threaded tube 23 toward the direction of the test nut 13. When When the transmission block 28 at the end of the second threaded rod 24 contacts the clamping block 25, the transmission block 28 can push the clamping block 25 together with the transmission frame 26 toward the direction of the test nut 13 until the clamping block 25 contacts the test nut 13. The clamping block 25 is arc-shaped and is arranged in a ring shape with the test nut 13 as the center. Each clamping block 25 can be fitted on the side wall of the test nut 13. The test nut 13 can be clamped by the clamping block 25 to unload the test bolt 12 that has slipped. The arc-shaped inner wall surface of each clamping block 25 is provided with a layer of anti-skid pad 29. The surface of the anti-skid pad 29 is engraved with a herringbone anti-skid pattern, which can increase the friction between the test nut 13 and the clamping block 25, so as to improve the stability of the test nut 13, thereby preventing it from slipping during the unloading process;

[0027] An anti-slip sleeve 30 is provided on the handle 7. The anti-slip sleeve 30 is a silicone sleeve structure with a number of hemispherical protrusions evenly arranged on its surface. By rotating the handle 7, the first threaded tube 6 can be driven to rotate together with the unloading cylinder 2 to perform the unloading work of the test bolt 12. When a person holds the handle 7, the anti-slip sleeve 30 can effectively increase the friction between the hand and the handle 7 to prevent slipping and slipping.

[0028] Working principle: When using the present invention, the sealing door 31 is opened and the test bolt 12 to be tested is inserted into the unloading groove 10, and the bottom end of the test bolt 12 is passed through the through hole 11 and extends to the bottom of the nut baffle 1, and then the matching test nut 13 is threadedly connected to the test bolt 12. When performing a high-strength bolt torque coefficient test, a tightening force is applied to the test nut 13. If the quality of the test bolt 12 is unqualified, the test bolt 12 will slip, making it impossible to continue to apply force. Since the thread has been damaged, As a result, the test bolt 12 cannot be unloaded. At this time, the crank 15 is first turned to drive the first threaded rod 14 to move downward along the first threaded tube 6 until the bottom end of the first threaded rod 14 is inserted into the groove 21 on the surface of the pressure plate 16. When the bottom end of the first threaded rod 14 contacts the pressure plate 16, the pressure plate 16 can be driven to move downward and stretch the first spring 19 until the pressure block 17 is inserted into the unloading groove 10. When the pressure block 17 is inserted into the unloading groove 10, it can be tightly pressed against the top of the test bolt 12. At this time, the test bolt 12 can be pressed and fixed by the pressure block 17. The bottom of the block 17 is engraved with a herringbone anti-skid pattern, which can increase the friction between the pressure block 17 and the test bolt 12, so as to improve the stability of the test bolt 12, thereby preventing it from slipping during unloading. Then, the second threaded rod 24 is rotated to move it along the second threaded tube 23 toward the test nut 13 until the transmission block 28 at the end of the second threaded rod 24 contacts the clamping block 25. At this time, the second threaded rod 24 can push the clamping block 25 together with the transmission frame 26 toward the test nut 13 through the transmission block 28 until the clamping block 25 is in contact with the test nut 13. The test nut 13 is clamped by the clamping blocks 25. The arc-shaped inner wall surface of each clamping block 25 is provided with a non-slip pad 29, which can increase the friction between the test nut 13 and the clamping block 25, so as to improve the stability of the test nut 13 and prevent it from slipping during the unloading process. Then, the positioning bolt 4 is unscrewed from the thread groove 5, and the handle 7 is held to drive the first threaded tube 6 to rotate together with the unloading cylinder 2. When the unloading cylinder 2 rotates, the unloading seat 9 can be driven together with the test bolt 12 in the unloading groove 10. The first threaded rod 14 is disengaged from the test nut 13 and the first threaded rod 14 is disengaged from the test nut 13. The first threaded rod 14 is disengaged from the test nut 13 by rotating the crank 15. The moving block 18 can drive the pressure plate 16 and the pressure block 17 to move upward under the elastic reset action of the first spring 19 until the pressure block 17 is pulled out of the unloading groove 10. The test bolt 12 with slipped threads is then pulled out of the unloading groove 10, and the sealing door 31 is opened to remove it from the unloading cylinder 2. The unloading of the entire slipped bolt is completed.

[0029] While 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 these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A structure for unloading a threaded bolt in a high-strength bolt torque coefficient test, comprising a nut baffle (1), characterized in that: The top of the nut baffle (1) is provided with an unloading cylinder (2), the front end surface of the unloading cylinder (2) is provided with a sealing door (31), the bottom edge of the unloading cylinder (2) is provided with a plurality of positioning holes (3), the positioning holes (3) are inserted with positioning bolts (4), the top surface of the nut baffle (1) is provided with a plurality of threaded grooves (5) that match the positioning bolts (4), the top of the unloading cylinder (2) is fixedly connected with a first threaded tube (6), the outer walls of both sides of the first threaded tube (6) are fixedly connected with a rotating handle (7), the wall surfaces of both sides of the unloading cylinder (2) are provided with a movable groove (8), and the unloading cylinder (2) is provided with a plurality of threaded grooves (5) that match the positioning bolts (4). The inner wall of the bottom end is fixedly connected with an unloading seat (9), the top of the unloading seat (9) is provided with an unloading groove (10), the unloading groove (10) is circular, and a through hole (11) is provided at the center of the bottom thereof and the center of the nut baffle (1), and a test bolt (12) is inserted into the unloading groove (10), the bottom end of the test bolt (12) passes through the through hole (11) and extends to the bottom of the nut baffle (1), and a test nut (13) matched therewith is threadedly connected to the test bolt (12), an unloading mechanism is provided above the unloading seat (9), and a clamping mechanism is provided at the bottom of the nut baffle (1); The unloading mechanism includes a first threaded rod (14), the first threaded rod (14) is threadedly connected in the first threaded tube (6), the top of the first threaded rod (14) is fixedly connected to a crank (15), and the bottom of the first threaded rod (14) is provided with a pressure plate (16), the pressure plate (16) is located in the unloading cylinder (2), the bottom of the pressure plate (16) is fixedly connected to a pressure block (17), and both side walls of the pressure plate (16) are fixedly connected to a moving block (18), the moving block (18) passes through the moving groove (8) and extends to the outside of the unloading cylinder (2), the top of the moving block (18) is fixedly connected to a first spring (19), the top of the first spring (19) is fixedly connected to a fixed block (20), and the fixed block (20) is fixedly connected to the top outer wall of the unloading cylinder (2).

2. The structure for unloading a stripped bolt in a high-strength bolt torque coefficient test according to claim 1, characterized in that: The cross section of the pressing block (17) is circular, the diameter of which is equal to the diameter of the unloading groove (10), and the bottom of the pressing block (17) is engraved with a herringbone anti-slip pattern.

3. The structure for unloading a stripped bolt in a high-strength bolt torque coefficient test according to claim 1, characterized in that: A slot (21) is provided on the top surface of the pressure plate (16). The slot (21) is circular, and its diameter is equal to the rod diameter of the first threaded rod (14). The centers of the slot (21) and the first threaded rod (14) are located on the same straight line.

4. The structure for unloading a stripped bolt in a high-strength bolt torque coefficient test according to claim 1, characterized in that: The clamping mechanism comprises a fixed tube (22), the fixed tube (22) being fixedly connected to the bottom of the nut baffle (1), a plurality of second threaded tubes (23) being fixedly connected to the tube wall thereof, a second threaded rod (24) being internally threadedly connected to the second threaded tube (23), a plurality of clamping blocks (25) being arranged in the fixed tube (22), the number of the clamping blocks (25) being the same as the number of the second threaded tubes (23), a transmission frame (26) being fixedly connected to the side of the clamping block (25) close to the inner wall of the fixed tube (22), and a second spring (27) being fixedly connected between the clamping block (25) and the inner wall of the fixed tube (22), the second spring (27) being symmetrically arranged with respect to the transmission frame (26), the end of the second threaded rod (24) passing through the transmission frame (26) and being fixedly connected to the transmission block (28), the transmission block (28) being located in the transmission frame (26).

5. The structure for unloading a stripped bolt in a high-strength bolt torque coefficient test according to claim 4, characterized in that: The clamping block (25) is arc-shaped and arranged in a ring shape with the test nut (13) as the center, and a layer of anti-skid pad (29) is provided on the arc-shaped inner wall surface of each clamping block (25), and the surface of the anti-skid pad (29) is engraved with herringbone anti-skid patterns.

6. The structure for unloading a stripped bolt in a high-strength bolt torque coefficient test according to claim 1, characterized in that: The rotating handle (7) is covered with an anti-slip cover (30), which is a silicone cover structure, and a plurality of hemispherical protrusions are evenly arranged on its surface.

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