Anti-drop bolt assembly

Abstract

The present invention relates to the field of bolt technology, specifically to an anti-falling bolt assembly, comprising a bolt body and a locking nut matched with the bolt body, the bolt body comprising a bolt head and a bolt rod, the bolt rod being provided with a first threaded portion, the locking nut comprising a base and an inner hole, the inner hole being provided with a second threaded portion matched with the first threaded portion, the first threaded portion being provided with a plurality of locking grooves, the base of the locking nut being provided with a slide groove, a locking block being slidably installed inside the slide groove, a cover plate being provided at one end of the slide groove away from the inner hole, a push spring being provided between the cover plate and the locking block, the push spring being used to push the locking block toward the direction of the axis of the inner hole. The present invention uses a locking groove and a locking block, and when the locking nut is loosened and rotated, the push spring pushes the locking block into the locking groove, so that the locking nut can no longer rotate along the thread, thereby ensuring that the locking nut will not fall off the bolt.

Description

Technical Field

[0001] The invention relates to the technical field of bolts, in particular to an anti-dropping bolt assembly. Background Art

[0002] In production, various mechanical equipment or mechanical components are needed, and various mechanical equipment and mechanical components usually use bolts and nuts to connect and assemble parts. During the use of various mechanical equipment, the rotation of the motor will cause the equipment to vibrate. Long-term equipment vibration will cause the nuts to loosen from the bolts, which will cause the bolts and nuts to tighten the parts, causing the equipment to make loud noises during operation, affecting the health of workers. Loose bolts and nuts will further increase the vibration amplitude of the parts, and collisions between mechanical parts will easily affect the service life of the equipment. In addition, if the bolts and nuts fall off due to vibration, it may also cause safety accidents.

[0003] In order to solve the problem that bolts and nuts are easily loosened and separated after the equipment vibrates, a Chinese invention patent with application number: CN201810431818.7 and name: "Anti-falling bolt and anti-falling bolt assembly and method of use thereof" proposed a solution, which is to set a receiving groove and a limiting groove on the bolt head, and rotatably set a bayonet inside the receiving groove and the limiting groove, so that the bayonet can be stuck in the limiting groove to prevent the nut from falling off from the end of the bolt, thereby ensuring the safety of mechanical construction and extending the service life of the machinery to a certain extent.

[0004] However, although the above invention patent prevents the nut from falling off from the end of the bolt by setting a bayonet, since the position of the limit groove is fixed, during actual use, after the nut cooperates with the bolt to lock the workpiece, the bayonet may not be able to just press against the back of the nut, that is, there is a gap between the nut and the bayonet. The larger the gap between the nut and the bayonet, the greater the distance the nut can loosen along the bolt. Although the bayonet can prevent the nut from falling off the bolt, it is difficult to limit the loosening of the nut. When the degree of nut loosening is too large after long-term use, the vibration amplitude of the parts during equipment operation will also increase, and thus the impact on the bayonet will also increase. The bayonet is also easily damaged under long-term large vibration impact, which can cause the nut to fall off the bolt, thereby causing damage to the equipment.

[0005] Therefore, an anti-dropping bolt assembly is proposed to solve the problem that the nut loosens from the bolt and causes damage to the equipment. Summary of the invention

[0006] The object of the present invention is to provide an anti-dropping bolt assembly, which solves the problem of equipment damage caused by the loosening of the nut from the bolt proposed in the above background technology by reducing the distance that the nut loosens along the bolt and thereby reducing the amplitude of vibration impact between parts.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] 14. The nut as claimed in claim 13, wherein the locking nut has a first threaded portion and a second threaded portion that matches the first threaded portion. The locking nut comprises a base and an inner hole, and a second threaded portion that matches the first threaded portion is disposed in the inner hole. The first threaded portion is provided with a plurality of locking grooves, and the locking grooves are all arranged along the axial direction of the bolt rod. The plurality of locking grooves are evenly distributed on the bolt body with the axis of the bolt rod as the reference circumference, and the depths of the locking grooves are all greater than the tooth height of the first threaded portion. The base of the locking nut is provided with a sliding groove, and the sliding groove is perpendicular to the axial direction of the inner hole. The sliding groove passes through the base and is connected with the inner hole. A locking block is slidably installed in the sliding groove. A cover plate is provided at one end of the sliding groove away from the inner hole, and a push spring is provided between the cover plate and the locking block. The push spring is used to push the locking block in the direction of the axis of the inner hole.

[0009] After tightening the nut, the locking block is installed by sliding it inside the slide groove, and a push spring is set at the end of the locking block away from the inner hole, and finally the cover plate is covered and fixed to the base of the nut, so that the push spring always squeezes the locking block toward the inner hole. In this way, when the nut is loose, when the locking block is rotated to align with the locking groove, the locking block will be stuck in the locking groove under the push of the push spring, making it impossible for the nut to continue to rotate, preventing the nut from continuing to loosen, effectively avoiding the equipment from loosening due to the loosening of the nut, and ensuring the stability and safety of the equipment during use.

[0010] The multiple locking grooves are arranged to limit the loosening range of the nut, so that before the nut rotates one circle, the locking block can be stuck in the locking groove to prevent the locking nut from further loosening.

[0011] Preferably, the two end faces of the base body perpendicular to the inner hole axis are respectively an extrusion face and a free face, a spring is fixedly mounted on the extrusion face, the spring is arranged at an angle to the extrusion face, an extrusion plate is arranged at one end of the spring away from the extrusion face, and the extrusion plate is arranged parallel to the extrusion face. When the nut and the workpiece are in extrusion contact, the spring can increase the pre-tightening force of the nut and the bolt on the workpiece, thereby increasing the friction between the first threaded portion and the second threaded portion to prevent the nut from loosening. The extrusion plate increases the contact area between the spring and the workpiece, thereby increasing the friction between the spring and the workpiece.

[0012] Preferably, a through groove is provided on the base body, and the through groove passes through the base body along the axial direction of the inner hole, the through groove is aligned with the slide groove and is connected with the slide groove, and the through groove is aligned with the extrusion plate, an extrusion block is slidably installed inside the through groove, the extrusion block is located above the slide groove, and an arc-shaped extrusion portion is provided at the lower end of the extrusion block, and an inclined guide portion is provided at the end of the locking block away from the axis of the inner hole, the guide portion is located on the upper side of the locking block and is inclined downward in the direction of the extrusion surface, and an avoidance groove for avoiding a push spring is provided at the lower end of the extrusion block, and two flexible connecting cables are respectively provided on both sides of the avoidance groove, and the two connecting cables are connected to the extrusion plate below the through groove.

[0013] The bottom of the extrusion block is connected to the extrusion plate below through a connecting cable. When the nut is loosened, the extrusion plate pulls the extrusion block downward through the connecting cable under the action of elastic force, and the extrusion part presses the guide part, further providing a pressure to the locking block in the direction of the inner hole axis, thereby preventing the nut from loosening.

[0014] A flexible connecting rope is used because after the extrusion plate is extruded, it does not move in a straight line along the axis of the inner hole, but will deviate in a direction perpendicular to the axis of the inner hole. If the connecting rope is rigid, it will easily break at the connection point.

[0015] Preferably, a rubber sheet is fixedly mounted on the bottom of the extrusion plate, and a first anti-skid pattern is provided on the bottom of the rubber sheet. The rubber sheet and the anti-skid pattern can increase the friction resistance between the extrusion plate and the workpiece, thereby effectively preventing the nut from rotating due to vibration, thereby preventing the nut from loosening from the bolt due to vibration.

[0016] Preferably, rubber blocks are fixedly installed on both sides of the locking groove, and second anti-skid patterns are evenly arranged on the rubber blocks along the axis direction of the bolt rod. The rubber blocks and the second anti-skid patterns can lock the friction between the blocks and the two sides of the locking groove, thereby reducing the possibility of the locking blocks detaching from the locking groove due to vibration, further improving the stability of the bolt assembly during use, preventing the nut from loosening and falling off the bolt, and ensuring the safety and stability of the equipment during use.

[0017] In addition, the rubber blocks on both sides can reduce the collision between the locking block and the locking groove due to vibration, play a buffering role, and can effectively reduce the possibility of damage to the locking block and the locking groove due to collision, thereby increasing the service life of the locking block and the locking groove.

[0018] Preferably, a pull rod is fixedly installed at one end of the locking block away from the inner hole axis, the pull rod is located at the lower side of the guide part, the pull rod is arranged along the slide slot and passes through the cover plate to extend outside the slide slot, the push spring is wound around the pull rod, and a pull plate is fixedly installed at one end of the pull rod extending outside the slide slot. The pull rod can pull the locking block in a direction away from the inner hole, making it convenient to rotate the nut along the thread of the bolt rod, and the pull plate is convenient for manual grasping, thereby improving the convenience of using the pull rod.

[0019] The setting of the pull rod allows the cover to be completely fixed on the base without the need for disassembly, preventing the cover from being separated from the base due to the elastic force of the push spring, which in turn causes the push spring to be unable to effectively keep the locking block pushed toward the inner hole, resulting in the failure of the anti-loosening and anti-falling effect of the nut.

[0020] The setting of the pull rod can also effectively improve the convenience of using the anti-drop bolt assembly. When installing or removing the nut, there is no need to remove the locking block from the nut. The nut can be rotated along the thread of the bolt rod by pulling the pull rod.

[0021] Preferably, the rubber block is provided with a guide ramp on one side of the notch of the locking groove, and the guide ramp is inclined from the notch direction of the locking groove toward the bottom of the locking groove. The locking block is provided with a step portion at one end facing the axis of the inner hole, and the step portion is in the shape of a quadrangular platform, with the smaller bottom surface of the step portion facing the direction of the axis of the inner hole. The provision of the guide ramp and the step portion can guide the locking block, so that the locking block can be more smoothly inserted into the locking groove, complete the locking of the nut, and prevent the nut from continuing to loosen. This prevents the locking block from failing to enter the locking groove in time when passing through the locking groove, and effectively ensures the stability of the bolt assembly.

[0022] Preferably, the connecting cable is flat, the width of the flat connecting cable is D, the width direction of the connecting cable is set along the direction of the axis of the push spring, the pitch of the push spring is t, and D>t. Because the connecting cable is a flexible material, when the nut is locked, the extrusion plate will be moved in the direction of the extrusion surface, and the connecting cable will no longer be straightened. The connecting cable may be stuck between the pitches of the push spring. When the locking block needs to be pulled away from the axis of the inner hole, the locking spring and the connecting cable are easily stuck due to interference. Letting D>t can effectively solve the above problem, ensure that the nut can be smoothly removed from the bolt when needed, and ensure the stability of the bolt assembly.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. An anti-falling bolt assembly designed by the present invention is provided with a locking groove and a locking block. When the locking nut is loosened and rotated, a spring is pushed to push the locking block into the locking groove, so that the locking nut can no longer rotate along the thread, thereby ensuring that the locking nut will not fall off the bolt. There are multiple locking grooves, which can lock the locking nut before it rotates one circle, effectively reducing the distance that the nut is loosened on the bolt, thereby ensuring the safety and stability of the production equipment during use.

[0025] 2. The anti-drop bolt assembly designed by the present invention also has a spring sheet and an extrusion plate arranged on the extrusion surface of the nut. When the nut is tightened, the spring sheet and the extrusion plate can increase the pre-tightening force of the bolt assembly on the workpiece, thereby increasing the friction between the first threaded portion and the second threaded portion to prevent the nut from loosening from the bolt. In addition, a rubber sheet is arranged at the bottom of the extrusion plate and a first anti-slip pattern is arranged on the rubber sheet to further increase the friction between the extrusion plate and the workpiece to prevent the nut from loosening.

[0026] 3. An anti-falling bolt assembly designed by the present invention is also provided with a through groove on the base of the nut, and an extrusion block is slidably installed inside the through groove. The bottom of the extrusion block is connected to the extrusion plate below by a connecting rope. When the nut is loosened, the extrusion plate pulls the extrusion block downward under the action of elastic force, further providing a pressure to the locking block in the direction of the inner hole axis, thereby preventing the nut from loosening. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A top perspective view of the present invention;

[0028] Figure 2 For the present invention Figure 1 The enlarged view of point A in the middle;

[0029] Figure 3 A bottom-up stereogram of the present invention;

[0030] Figure 4 For the present invention Figure 3 The enlarged view of point B in the middle;

[0031] Figure 5 A top view of the present invention;

[0032] Figure 6 For the present invention Figure 5 Sectional view at CC;

[0033] Figure 7 For the present invention Figure 6 Enlarged view of point E in the middle;

[0034] Figure 8 A three-dimensional diagram of the internal structure of the locking nut in the present invention;

[0035] Fig. 9 It is a schematic diagram of the three-dimensional structure of the extrusion block in the present invention.

[0036] In the figure: 1. bolt body; 101. bolt head; 102. bolt rod; 2. locking nut; 201. base; 202. inner hole; 3. first threaded portion; 4. second threaded portion; 5. locking groove; 6. slide groove; 7. locking block; 8. cover plate; 9. push spring; 10. extrusion surface; 11. free surface; 12. spring leaf; 13. extrusion plate; 14. through groove; 15. extrusion block; 16. extrusion portion; 17. guide portion; 18. avoidance groove; 19. connecting rope; 20. rubber sheet; 21. first anti-skid pattern; 22. rubber block; 23. second anti-skid pattern; 24. pull rod; 25. pull plate; 26. guide slope; 27. step portion. DETAILED DESCRIPTION

[0037] See also Figures 1 to 9 The present invention provides an anti-dropping bolt assembly, and the technical solution is as follows:

[0038] An anti-drop bolt assembly includes a bolt body 1 and a locking nut 2 matched with the bolt body 1, wherein the bolt body 1 includes a bolt head 101 and a bolt rod 102, wherein the bolt rod 102 is provided with a first threaded portion 3, and the locking nut 2 includes a base 201 and an inner hole 202, wherein the inner hole 202 is provided with a second threaded portion 4 matched with the first threaded portion 3, and the first threaded portion 3 is provided with four locking grooves 5, wherein the locking grooves 5 are all arranged along the axis direction of the bolt rod 102, and the four locking grooves 5 are evenly distributed on the bolt body 1 with the axis of the bolt rod 102 as the reference circumference, and the depth of the locking grooves 5 is greater than the tooth height of the first threaded portion 3. A rubber block 22 is fixedly installed on both sides of each locking groove 5, and a second anti-slip pattern 23 is evenly arranged on the rubber block 22 along the axis direction of the bolt rod 102. A guide slope 26 is arranged on one side of the notch of the locking groove 5, and the guide slope 26 is inclined from the notch direction of the locking groove 5 toward the groove bottom direction of the locking groove 5.

[0039] refer to Figures 6 to 8, two slide grooves 6 are provided on the base 201 of the locking nut 2, and the two slide grooves 6 are symmetrically arranged about the inner hole 202. The slide grooves 6 are perpendicular to the axis direction of the inner hole 202, and the slide grooves 6 pass through the base 201 and communicate with the inner hole 202. Locking blocks 7 are slidably installed inside the slide grooves 6. The ends of the locking blocks 7 away from the axis of the inner hole 202 are provided with inclined guide parts 17. The guide parts 17 are located on the upper side of the locking blocks 7 and are inclined downward in the direction of the extrusion surface 10. Cover plates 8 are welded to the ends of the slide grooves 6 away from the inner hole 202. Push springs 9 are arranged between the cover plates 8 and the locking blocks 7. Pull rods 24 are fixedly installed at the ends of the locking blocks 7 away from the axis of the inner hole 202. The pull rods 24 are located at the lower side of the guide parts 17. Each pull rod 24 is arranged along the slide groove 6 and passes through the cover plates 8 to extend out of the slide groove 6. Push springs 9 are wound around the pull rods 24. A pull plate 25 is also fixedly installed at the ends of each pull rod 24 extending out of the slide groove 6.

[0040] refer to Figure 7 A step portion 27 is provided at one end of the locking block 7 facing the axis of the inner hole 202 . The step portion 27 is in the shape of a quadrangular pyramid, and a smaller bottom surface of the step portion 27 faces the direction of the axis of the inner hole 202 .

[0041] refer to Figure 3 , Figure 4 , Figure 6 and Figure 8 The two end surfaces of the base 201 perpendicular to the axis of the inner hole 202 are respectively an extrusion surface 10 and a free surface 11. Two springs 12 are fixedly installed on the extrusion surface 10. The two springs 12 are symmetrically arranged about the inner hole 202. The springs 12 and the extrusion surface 10 are both inclined. An extrusion plate 13 is fixedly installed at one end of the spring 12 away from the extrusion surface 10. The extrusion plate 13 is arranged parallel to the extrusion surface 10. A rubber sheet 20 is fixedly installed at the bottom of the extrusion plate 13. The bottom of the rubber sheet 20 is provided with a first anti-slip pattern 21.

[0042] refer to Figure 6 and Figure 7The base 201 is provided with two through grooves 14, which are also symmetrical about the inner hole 202. The two through grooves 14 penetrate the base 201 along the axial direction of the inner hole 202. The two through grooves 14 are respectively aligned with the two slide grooves 6 and communicate with the slide grooves 6, and the two through grooves 14 are respectively aligned with the extrusion plate 13 in the axial direction of the inner hole 202. Extrusion blocks 15 are slidably installed inside the through grooves 14. The extrusion blocks 15 are located above the slide grooves 6. The lower end of the extrusion block 15 is provided with an arc-shaped extrusion portion 16. The lower end of the pressure block 15 is provided with an avoidance groove 18 for avoiding the push spring 9, and two flexible connecting cables 19 are fixedly connected on both sides of the avoidance groove 18, and the connecting cables 19 are flat, and the width of the flat connecting cables 19 is D. The width direction of the connecting cables 19 is set along the direction of the axis of the push spring 9, and the pitch of the push spring 9 is t, D>t. The two connecting cables 19 pass through both sides of the pull rod 24, and the two connecting cables 19 extend from under the through slot 14 and are connected to the extrusion plate 13 under the through slot 14.

[0043] When using, refer to Figure 1 , Figure 3 , Figure 4 , Figure 7 and Figure 8 , pull the pull rod 24, let the locking block 7 move away from the inner hole 202 in a direction perpendicular to the axis of the inner hole 202, then align the inner hole 202 of the nut with the bolt rod 102, and turn the extrusion surface 10 toward the direction of the bolt head 101, so that the first threaded portion 3 is engaged with the second threaded portion 4. Then, the base 201 of the locking nut 2 is continuously rotated until the locking nut 2 is tightly squeezed onto the workpiece. The extrusion plate 13 is pressed toward the extrusion surface 10 and fits onto the extrusion surface 10, and the connecting cable 19 is in a relaxed state. Then, the pull rod 24 is loosened to complete the connection between the bolt body 1 and the locking nut 2. At this time, the end of the locking block 7 facing the inner hole 202 abuts against the first threaded portion 3 under the elastic force of the push spring 9, and the bolt head 101 and the locking nut 2 cooperate with each other to clamp the workpiece. The spring leaf 12 increases the pre-tightening force on the workpiece, thereby increasing the friction between the first threaded portion 3 and the second threaded portion 4, and preventing the locking nut 2 from loosening from the bolt body 1.

[0044] When the workpiece vibrates during use, refer to Figure 3 , Figure 4 as well as Figures 6 to 8If the locking nut 2 is loosened due to vibration, when the locking nut 2 is loosened and rotated, when the locking block 7 passes through the locking groove 5, the locking block 7 is pushed toward the inside of the locking groove 5 by the pushing spring 9 under the action of the pushing spring 9, and the locking block 7 is stuck in the locking groove 5. In this way, the locking nut 2 can no longer rotate, and the locking nut 2 is locked to prevent the locking nut 2 from continuing to loosen. The spring leaf 12 is deformed under the action of its own elastic force and causes the extrusion plate 13 to continue to abut against the workpiece, the extrusion plate 13 is separated from the extrusion surface 10, and the spring leaf 12 continues to provide pre-tightening force for the workpiece. Since the extrusion plate 13 is disengaged from the extrusion surface 10, the extrusion plate 13 pulls the connecting rope 19 and pulls the extrusion block 15 toward the bolt head 101, so that the extrusion plate 13 of the extrusion block 15 is pressed on the guide portion 17 of the locking block 7, and further pushes the locking block 7 toward the locking groove 5, preventing the locking block 7 from disengaging from the inside of the locking groove 5, thereby ensuring that the locking nut 2 will not continue to loosen, thereby ensuring the stability of the workpiece and the equipment.

[0045] A specific embodiment of the present invention is described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above described embodiment. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments without departing from the principles and ideas of the present invention should still fall within the scope of protection of the present invention.

Claims

1. An anti-dropping bolt assembly, comprising a bolt body (1) and a locking nut (2) matching the bolt body (1), wherein the bolt body (1) comprises a bolt head (101) and a bolt rod (102), wherein the bolt rod (102) is provided with a first threaded portion (3), and the locking nut (2) comprises a base (201) and an inner hole (202), wherein the inner hole (202) is provided with a second threaded portion (4) matching the first threaded portion (3), wherein: The first threaded portion (3) is provided with a plurality of locking grooves (5), the locking grooves (5) are all arranged along the axial direction of the bolt rod (102), the plurality of locking grooves (5) are evenly distributed on the bolt body (1) with the axis of the bolt rod (102) as the reference circumference, the depth of the locking grooves (5) is greater than the tooth height of the first threaded portion (3), the base (201) of the locking nut (2) is provided with a slide groove (6), the slide groove (6) is perpendicular to the axial direction of the inner hole (202), the slide groove (6) passes through the base (201) and is connected with the inner hole (202), a locking block (7) is slidably installed inside the slide groove (6), a cover plate (8) is arranged at one end of the slide groove (6) away from the inner hole (202), a push spring (9) is arranged between the cover plate (8) and the locking block (7), and the push spring (9) is used to push the locking block (7) toward the direction of the axis of the inner hole (202).

2. The anti-drop bolt assembly according to claim 1, characterized in that: The two end surfaces of the base (201) perpendicular to the axis of the inner hole (202) are respectively an extrusion surface (10) and a free surface (11); a spring leaf (12) is fixedly mounted on the extrusion surface (10); the spring leaf (12) is arranged obliquely to the extrusion surface (10); an extrusion plate (13) is arranged at one end of the spring leaf (12) away from the extrusion surface (10); and the extrusion plate (13) is arranged parallel to the extrusion surface (10).

3. The anti-drop bolt assembly according to claim 2, characterized in that: The base body (201) is provided with a through groove (14), the through groove (14) passes through the base body (201) along the axial direction of the inner hole (202), the through groove (14) is aligned with the slide groove (6) and communicates with the slide groove (6), and the through groove (14) is aligned with the extrusion plate (13), an extrusion block (15) is slidably installed inside the through groove (14), the extrusion block (15) is located above the slide groove (6), and the lower end of the extrusion block (15) is provided with an arc-shaped extrusion portion (16), the An inclined guide portion (17) is provided at one end of the locking block (7) away from the axis of the inner hole (202), the guide portion (17) is located on the upper side of the locking block (7) and is inclined downward in the direction of the extrusion surface (10), and an avoidance groove (18) for avoiding the push spring (9) is provided at the lower end of the extrusion block (15), and two flexible connecting cables (19) are respectively provided on both sides of the avoidance groove (18), and the two connecting cables (19) are connected to the extrusion plate (13) below the through groove (14).

4. The anti-drop bolt assembly according to claim 2, characterized in that: A rubber sheet (20) is fixedly mounted on the bottom of the extrusion plate (13), and a first anti-slip pattern (21) is provided on the bottom of the rubber sheet (20).

5. The anti-drop bolt assembly according to claim 1, characterized in that: Rubber blocks (22) are arranged on both the left and right sides of the locking groove (5), and second anti-slip patterns (23) are evenly arranged on the rubber blocks (22) along the axial direction of the bolt rod (102).

6. The anti-drop bolt assembly according to claim 3, characterized in that: A pull rod (24) is fixedly installed on one end of the locking block (7) away from the axis of the inner hole (202), and the pull rod (24) is located on the lower side of the guide portion (17). The pull rod (24) is arranged along the slide groove (6) and passes through the cover plate (8) and extends out of the slide groove (6). The push spring (9) is wound around the pull rod (24), and a pull plate (25) is also fixedly installed on the end of the pull rod (24) extending out of the slide groove (6).

7. The anti-drop bolt assembly according to claim 5, characterized in that: The rubber block (22) is provided with a guide slope (26) on one side of the notch of the locking groove (5), and the guide slope (26) is inclined from the notch direction of the locking groove (5) toward the groove bottom direction of the locking groove (5). The locking block (7) is provided with a step portion (27) at one end facing the axis of the inner hole (202), and the step portion (27) is in the shape of a quadrangular pyramid, and a smaller bottom surface of the step portion (27) faces the direction of the axis of the inner hole (202).

8. The anti-drop bolt assembly according to claim 3, characterized in that: The connecting rope (19) is flat, the width of the flat connecting rope (19) is D, the width direction of the connecting rope (19) is arranged along the direction of the axis of the pushing spring (9), the pitch of the pushing spring (9) is t, and D>t.

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