Anti-falling expansion bolt structure

Abstract

The utility model relates to an anti-drop expansion bolt structure which comprises an expansion sleeve and a screw rod, threads are arranged on the periphery of the screw rod, an auxiliary fixing sleeve is arranged on the end portion of one side of the expansion sleeve, a plurality of installation grooves are formed in the periphery of the auxiliary fixing sleeve and are evenly distributed along the circumference, jacking blocks are rotationally connected in the installation grooves, and the jacking blocks are arranged on the periphery of the screw rod. The height of the jacking blocks is sequentially increased in the screw retreating direction of the screw, inclined guide side walls are formed, a push block is arranged at the end of one side of the screw, the height of the push block is sequentially increased in the screw retreating direction of the screw, inclined connection side walls are formed, the connection side walls are matched with the guide side walls, and the push block is used for pushing the jacking blocks. And therefore, the top supporting block is extruded between the mounting hole and the screw rod to form friction self-locking. The expansion screw has the following advantages and effects that when the expansion sleeve is broken, the expansion screw can still be fixed, so that the fixing stability of the expansion screw is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of bolts, in particular to an anti-falling expansion bolt structure. Background Art

[0002] Expansion bolts are bolt assemblies that are tightened by generating frictional gripping force through the compression and expansion of the sheath slope on the outer circumference of the expansion sleeve. They are widely used because of their strong tightening performance.

[0003] For example, a Chinese patent document with publication number CN218030990U discloses an expansion bolt, comprising a screw rod, an expansion sleeve and a movable sleeve, wherein the expansion sleeve is sleeved on the screw rod, the movable sleeve is sleeved on the screw rod and is threadedly connected to the screw rod, the movable sleeve can move along the screw rod as the screw rod rotates to compress the expansion sleeve, and the expansion sleeve is provided with a plurality of strip openings spaced apart along the circumference of the expansion sleeve, and the strip openings extend along the axial spiral of the expansion sleeve.

[0004] It can be seen from the above disclosed content that in the above technical solution, by providing a plurality of strip-shaped openings extending spirally along the axial direction of the expansion sleeve on the expansion sleeve, the expansion sleeve is spirally contracted during the compression process, which can effectively prevent the expansion sleeve from breaking. However, the expansion sleeve is mostly made of rubber, and during use, the expansion sleeve is easily broken due to aging, making the expansion sleeve ineffective, thereby affecting the fixing effect of the expansion bolt. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the utility model is to provide an anti-falling expansion bolt structure, when the expansion sleeve is broken, the expansion screw can still be fixed, so as to improve the stability of the expansion bolt when being fixed.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an anti-falling expansion bolt structure, comprising an expansion sleeve and a screw rod, the outer circumference of the screw rod is provided with a thread, one side end of the expansion sleeve is provided with an auxiliary fixing sleeve, the outer circumference of the auxiliary fixing sleeve is provided with a mounting groove, the mounting grooves are multiple and evenly distributed along the circumference, a top support block is rotatably connected in the mounting groove, the height of the top support block increases successively along the direction of screw thread withdrawal and forms an inclined guide side wall, one side end of the screw rod is provided with a push block, the height of the push block increases successively along the direction of screw thread withdrawal and forms an inclined connecting side wall, the connecting side wall is adapted to the guide side wall, and the push block is used to push the top support block so that the top support block is squeezed between the mounting hole and the screw rod to form friction self-locking.

[0007] The utility model is further configured as follows: the surface of the expansion sleeve is provided with corrugated grooves, the corrugated grooves are multiple and evenly distributed along the circumference, and a mounting area is formed between adjacent corrugated grooves.

[0008] The utility model is further configured as follows: an anti-slipping block is arranged in the installation area, the anti-slipping blocks are multiple and are arranged at intervals from each other along the horizontal direction, and the anti-slipping blocks are in a wedge shape.

[0009] The utility model is further configured as follows: an elastic pad is fixed on the surface of the top support block, and a gripping spike is arranged on the surface of the elastic pad. There are multiple gripping spikes, which are arranged at intervals from each other in the horizontal direction and the vertical direction.

[0010] The utility model is further configured as follows: a protruding connection flange is provided at the end of the expansion sleeve, and a connection groove is provided on the side of the auxiliary fixing sleeve facing the expansion sleeve, and the connection groove is adapted to the connection flange.

[0011] The utility model is further configured as follows: a plate-like block is provided on a side of the expansion sleeve away from the auxiliary fixing sleeve, the plate-like blocks are multiple and evenly distributed along the circumference, and the plate-like blocks are used to improve the installation stability of the expansion sleeve in the installation hole.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] By connecting the auxiliary fixing sleeve to the end of the expansion sleeve, when the screw is screwed into the expansion sleeve, the screw can squeeze the expansion sleeve to form a friction self-locking, and in the process of screwing the screw in, the connecting side wall can gradually contact the guide side wall, so that the push block can push the support block as the screw is screwed in, so that the support block can be squeezed between the mounting hole and the screw to form a friction self-locking. Therefore, through the mutual cooperation of the expansion sleeve and the auxiliary fixing sleeve, the stability of the expansion bolt fixation can be improved. Even if the expansion sleeve breaks, the friction force generated between the auxiliary fixing sleeve, the screw and the mounting hole can still prevent the expansion bolt from falling off. Therefore, the technical problem in the prior art that if the expansion sleeve breaks, the expansion bolt will fall off is effectively solved. Furthermore, when the expansion sleeve breaks, the expansion screw can still be fixed to improve the stability of the expansion bolt when it is fixed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the explosion structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the overall structure of the auxiliary fixing sleeve in the utility model;

[0016] Figure 3 It is a schematic diagram of the matching relationship between the push block and the top support block in the utility model. DETAILED DESCRIPTION

[0017] The technical solution of the present invention will be described clearly and completely below 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 creative work are within the scope of protection of the present invention.

[0018] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0019] like Figures 1 to 3 As shown, the utility model discloses an anti-falling expansion bolt structure, including an expansion sleeve 1 and a screw rod 2, wherein the outer circumference of the screw rod 2 is provided with a thread, an auxiliary fixing sleeve 3 is provided at one end of the expansion sleeve 1, and an installation groove 31 is provided at the outer circumference of the auxiliary fixing sleeve 3, wherein the installation groove 31 is multiple and evenly distributed along the circumference, and a top support block 32 is rotatably connected in the installation groove 31, and the top support block 32 increases in height in the direction of the screw rod 2 withdrawing the thread and forms an inclined guide side wall 321, and a push block 21 is provided at one end of the screw rod 2, and the push block 21 increases in height in the direction of the screw rod 2 withdrawing the thread and forms an inclined connecting side wall 211, and the connecting side wall 211 is adapted to the guide side wall 321, and the push block 21 is used to push the top support block 32, so that the top support block 32 is squeezed between the installation hole and the screw rod 2 to form a friction self-locking;

[0020] When the screw rod 2 is screwed into the expansion sleeve 1, the screw rod 2 can squeeze the expansion sleeve 1 to form a friction self-locking, and in the process of screwing the screw rod 2 in, the connecting side wall 211 can gradually contact the guide side wall 321, so that the push block 21 can push the support block 32 as the screw rod 2 is screwed in. In addition, by adapting the guide side wall 321 and the connecting side wall 211 to each other, it can be ensured that the connecting side wall 211 and the guide side wall 321 are in full contact, so that it is convenient for the push block 21 to push the support block 32 to rotate. During the rotation of the support block 32, the support block 32 can be squeezed between the mounting hole and the screw rod 2 to form a friction self-locking. Therefore, through the mutual cooperation between the expansion sleeve 1 and the auxiliary fixing sleeve 3, the stability of the expansion bolt fixation can be improved. Even if the expansion sleeve 1 breaks, the friction force generated between the auxiliary fixing sleeve 3, the screw rod 2 and the mounting hole can still prevent the expansion bolt from falling off. Then, when the expansion sleeve 1 breaks, the expansion screw can still be fixed to improve the stability of the expansion bolt when it is fixed.

[0021] In this embodiment, a corrugated groove 111 is provided on the surface of the expansion sleeve 1. There are multiple corrugated grooves 111 and they are evenly distributed around the circumference. An installation area 112 is formed between adjacent corrugated grooves 111. By evenly arranging multiple corrugated grooves 111 on the surface of the expansion sleeve 1, it is possible to prevent the stress of the expansion sleeve 1 from being concentrated in a certain area when it is squeezed, thereby effectively preventing the expansion sleeve 1 from breaking during the extrusion process.

[0022] In this embodiment, an anti-slip block 4 is further provided in the installation area 112. There are multiple anti-slip blocks 4, which are arranged at intervals from each other in the horizontal direction. The anti-slip blocks 4 are wedge-shaped. By providing multiple anti-slip blocks 4, after the screw 2 is screwed into the expansion sleeve 1, the anti-slip blocks 4 can be squeezed toward the wall in the installation hole, thereby further improving the stability of the expansion sleeve 1 installed in the installation hole.

[0023] In this embodiment, an elastic pad 5 is further fixed on the surface of the top support block 32, and a gripping nail 51 is provided on the surface of the elastic pad 5. There are multiple gripping nails 51, and they are arranged at intervals from each other in the horizontal direction and the vertical direction. Through the set elastic pad 5, when the push block 21 squeezes the top support block 32, the elastic pad 5 is compressed and deformed. The force generated thereby can make the elastic pad 5 fully squeezed between the screw rod 2 and the mounting hole, and the gripping nails 51 arranged on the surface of the elastic pad 5 can further prevent the auxiliary fixing sleeve 3 from rotating in the mounting hole, thereby further improving the stability of the expansion bolt when being fixed.

[0024] In this embodiment, a protruding connecting flange 113 is provided at the end of the expansion sleeve 1, and a connecting groove 33 is provided on the side of the auxiliary fixing sleeve 3 facing the expansion sleeve 1, and the connecting groove 33 is adapted to the connecting flange 113, so that a detachable connection can be formed between the auxiliary fixing sleeve 3 and the expansion sleeve 1. Therefore, when the expansion sleeve 1 is broken and needs to be replaced, it is only necessary to remove the expansion sleeve 1 and replace the expansion sleeve 1, and there is no need to replace the auxiliary fixing sleeve 3 and the expansion sleeve 1 together, thereby reducing the use cost. When connecting, the connecting flange 113 is inserted into the connecting groove 33, so that the friction generated between the connecting flange 113 and the connecting groove 33 can achieve the fixation between the expansion sleeve 1 and the auxiliary fixing sleeve 3.

[0025] In this embodiment, a plate-like block 6 is provided on the side of the expansion sleeve 1 away from the auxiliary fixing sleeve 3. There are multiple plate-like blocks 6 that are evenly distributed around the circumference. After the expansion sleeve 1 is inserted into the mounting hole opened on the wall, the plate-like block 6 can be deformed, thereby improving the installation stability of the expansion sleeve 1 in the mounting hole. Therefore, when the screw 2 is screwed into the expansion sleeve 1, the expansion sleeve 1 can be prevented from falling off from the mounting hole.

[0026] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. An anti-falling expansion bolt structure, characterized in that: It includes an expansion sleeve and a screw rod, the outer circumference of the screw rod is provided with a thread, one side end of the expansion sleeve is provided with an auxiliary fixing sleeve, the outer circumference of the auxiliary fixing sleeve is provided with a mounting groove, the mounting grooves are multiple and evenly distributed along the circumference, a top support block is rotatably connected in the mounting groove, the height of the top support block increases successively along the direction of screw thread withdrawal and forms an inclined guide side wall, one side end of the screw rod is provided with a push block, the height of the push block increases successively along the direction of screw thread withdrawal and forms an inclined connecting side wall, the connecting side wall is adapted to the guide side wall, and the push block is used to push the top support block so that the top support block is squeezed between the mounting hole and the screw rod to form friction self-locking.

2. The anti-falling expansion bolt structure according to claim 1, characterized in that: The surface of the expansion sleeve is provided with corrugated grooves, and the corrugated grooves are multiple and evenly distributed along the circumference, and a mounting area is formed between adjacent corrugated grooves.

3. The anti-falling expansion bolt structure according to claim 2, characterized in that: An anti-slipping block is arranged in the installation area. There are a plurality of anti-slipping blocks, which are arranged at intervals from each other in the horizontal direction, and the anti-slipping blocks are in a wedge shape.

4. The anti-falling expansion bolt structure according to claim 1, characterized in that: An elastic pad is fixed on the surface of the top support block, and a ground-grasping spike is arranged on the surface of the elastic pad. There are a plurality of ground-grasping spikes, which are arranged at intervals from each other in the horizontal direction and the vertical direction.

5. The anti-falling expansion bolt structure according to claim 1, characterized in that: A protruding connection flange is provided at the end of the expansion sleeve, and a connection groove is provided on the side of the auxiliary fixing sleeve facing the expansion sleeve, and the connection groove is matched with the connection flange.

6. The anti-falling expansion bolt structure according to claim 1, characterized in that: The expansion sleeve is provided with a plate-like block on a side away from the auxiliary fixing sleeve. The plate-like blocks are multiple and evenly distributed along the circumference. The plate-like blocks are used to improve the installation stability of the expansion sleeve in the installation hole.

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