Anti-thread-slipping expansion bolt

Abstract

The utility model relates to the technical field of expansion bolts, in particular to an anti-thread-slipping expansion bolt which comprises a connecting sleeve, two first expansion pipes are symmetrically arranged at the bottom of the connecting sleeve and are each of an arc-shaped structure, when the ends of the two first expansion pipes abut against each other, a cylindrical cavity is formed between the two first expansion pipes, an inner threaded rod is arranged in the cavity, and an outer threaded rod is arranged in the inner threaded rod. The two ends of the inner screw extend out of the first expansion pipe, and the top of the inner screw further penetrates through the connecting sleeve and extends to the position above the connecting sleeve. The two first expansion pipes can horizontally move along the limiting skirt edge under the cooperation of the limiting skirt edge and the second connecting block, the second expansion pipe can be supported through the pushing head, and under the cooperation of the pushing head and the second expansion pipe, the second expansion pipe only generates counter-acting force in the horizontal direction on the pushing head; and therefore, the engaged threads between the inner screw rod and the fastening nut are not subjected to overlarge external force, thread slipping is avoided, and the using effect is improved.

Description

Technical Field

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

[0002] Expansion bolts are special threaded connectors used to fix pipe supports, hangers, brackets or equipment to walls, floors, and columns. During the installation process, workers are required to first make installation holes of preset sizes on walls and other parts, then insert the expansion tube of the expansion bolt into the installation hole, and then tighten the nut on the collision bolt. The nut will drive the inner screw to move, so that the big head at the other end of the inner screw will expand the expansion tube to complete the installation.

[0003] In existing expansion bolts, the end of the inner screw near the expansion tube is generally beveled. During use, the bevel will expand the expansion tube and clamp it into the installation hole. However, because the contact area between the expansion tube and the inner screw is beveled, the inner screw will decompose the reaction force of the expansion tube into horizontal and vertical forces under the action of the bevel. As a result, the threads where the nut and the inner screw mesh will be damaged by excessive external force, which will cause the expansion bolt to slip, resulting in poor performance. Moreover, during installation, there is no anti-loosening device between the nut and the inner screw, which makes the nut easily loose or fall off during the connection process, resulting in poor performance. To this end, we propose an expansion bolt with anti-slip threads. Utility Model Content

[0004] The purpose of the utility model is to solve the above-mentioned shortcomings in the prior art and to propose an expansion bolt with anti-slip wire.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an expansion bolt with anti-slip wire is designed, comprising a connecting sleeve, two first expansion tubes are symmetrically provided at the bottom of the connecting sleeve, both of which are arc-shaped structures, and when the ends of the two first expansion tubes are abutted, a cylindrical cavity is formed between the two first expansion tubes, an inner screw is provided in the cavity, both ends of the inner screw extend to the outside of the first expansion tube, and the top of the inner screw also penetrates the connecting sleeve and extends above the connecting sleeve;

[0006] A first connecting plate is installed on the bottom edge of the connecting sleeve. Limiting skirts are installed on both ends of the bottom edge of the first connecting plate. The cross-section of the limiting skirt is "L"-shaped, and a limiting groove is formed between the bottom of the limiting skirt and the bottom of the first connecting plate. A second connecting plate is installed on the top of each first expansion tube, and one end of each second connecting plate extends into the corresponding limiting groove.

[0007] A second expansion tube is provided at the bottom of each first expansion tube, and the top of each second expansion tube is connected to the corresponding first expansion tube through a first inclined surface. A push head is connected to the bottom of the inner screw through a second inclined surface, and the push head extends between the two second expansion tubes.

[0008] The top of the inner screw is covered with a fastening nut, which is threadedly connected to the inner screw, and a first support ring is connected to the bottom edge of the fastening nut, and a second support ring is installed on the top of the connecting sleeve. Two connecting rings are provided between the first support ring and the second support ring. The two connecting rings are connected by an elastic metal sheet. The elastic metal sheet is spirally arranged and the elastic metal sheet is slidably covered on the inner screw;

[0009] The adjacent surfaces of the first support ring and the second support ring are both installed with first anti-slip teeth, and the sides of the two connecting rings away from each other are both installed with second anti-slip teeth. When the fastening nut is tightened, the adjacent first anti-slip teeth and second anti-slip teeth engage with each other.

[0010] Preferably, the first inclined surface and the second inclined surface have the same inclination angle, and when the second inclined surface contacts the inner surface of the first inclined surface, the push head extends into the interior of the second expansion tube.

[0011] Preferably, the outer surface of each first expansion tube is installed with a plurality of first anti-slip teeth, and the outer surface of each second expansion tube is installed with a plurality of second anti-slip teeth. The first anti-slip teeth and the second anti-slip teeth are both inclined, and the ends of the first anti-slip teeth are flush with the ends of the second anti-slip teeth.

[0012] Preferably, positioning grooves are provided on both sides of the top of the inner screw, and positioning blocks are installed on both sides of the interior of the connecting sleeve, with one end of the positioning block extending into the corresponding positioning groove and fitting with the inner wall clearance of the positioning groove.

[0013] Preferably, when the proximal ends of the two second expansion tubes abut against each other, a cylindrical space is formed between the two second expansion tubes, and the diameter of the space is larger than the diameter of the inner screw and smaller than the diameter of the push head.

[0014] Preferably, the second expansion tube is made of elastic metal material.

[0015] Preferably, the inner surface of the limiting skirt is gap-fitted with the edge of the second connecting plate.

[0016] The design scheme proposed by the utility model has the following beneficial effects during application:

[0017] 1. The cooperation between the limiting skirt and the second connecting block allows the two first expansion tubes to move horizontally along the limiting skirt, and the second expansion tube can be supported by the push head. Under the cooperation of the push head and the second expansion tube, the second expansion tube will only generate a horizontal reaction force on the push head, so that the meshing threads between the inner screw and the fastening nut will not be subjected to excessive external force, and thus will not slip, thereby improving the use effect.

[0018] 2. The elastic force of the elastic metal sheet can apply thrust to the fastening nut, thereby increasing the friction between the fastening nut and the threaded teeth of the inner screw when tightening. The cooperation of the first anti-slip teeth and the second anti-slip teeth can limit the fastening nut, thereby preventing the fastening nut from loosening during the connection process and improving the use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the utility model;

[0020] Figure 2 This is a schematic diagram of the connecting sleeve and the first expansion tube structure of the utility model;

[0021] Figure 3 This is a side sectional view of the structure of the utility model;

[0022] Figure 4 This is a side view of the structure of the utility model installed in a wall mounting hole.

[0023] In the figure: 1. inner screw; 2. positioning groove; 3. fastening nut; 4. first support ring; 5. first anti-slip tooth; 6. second support ring; 7. first connecting plate; 8. limiting skirt; 9. second connecting plate; 10. connecting sleeve; 11. first expansion tube; 12. first anti-slip tooth; 13. first inclined surface; 14. second anti-slip tooth; 15. second expansion tube; 16. second inclined surface; 17. push head; 18. positioning block; 19. second anti-slip tooth; 20. elastic metal sheet; 21. connecting ring. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] Reference Figures 1-4 , an expansion bolt with anti-slip wire, including a connecting sleeve 10, two first expansion tubes 11 are symmetrically provided at the bottom of the connecting sleeve 10, and the two first expansion tubes 11 are both arc-shaped structures. When the ends of the two first expansion tubes 11 are against each other, a cylindrical cavity is formed between the two first expansion tubes 11, and an inner screw 1 is provided in the cavity. Both ends of the inner screw 1 extend to the outside of the first expansion tube 11, and the top of the inner screw 1 also passes through the connecting sleeve 10 and extends above the connecting sleeve 10. In actual use, Figure 4 As shown, the inner screw 1 can be inserted into the first expansion tube 11, and then the first expansion tube 11 can be inserted into the preset hole on the wall to complete the installation.

[0026] like Figure 2As shown, a first connecting plate 7 is installed on the bottom edge of the connecting sleeve 10, and limiting skirts 8 are installed on the two end edges of the bottom of the first connecting plate 7. The cross-section of the limiting skirt 8 is "L"-shaped, and a limiting groove is formed between the bottom of the limiting skirt 8 and the bottom of the first connecting plate 7. A second connecting plate 9 is installed on the top of each first expansion tube 11, and one end of each second connecting plate 9 extends into the corresponding limiting groove. In actual use, through the cooperation of the second connecting plate 9 and the limiting skirt 8, the first expansion tube 11 can be horizontally moved along the first connecting plate 7, and the distance between the two first expansion tubes 11 can be adjusted.

[0027] A fastening nut 3 is sleeved on the top of the inner screw 1, and the fastening nut 3 is threadedly connected to the inner screw 1, and a first support ring 4 is connected to the bottom edge of the fastening nut 3, and a second support ring 6 is installed on the top of the connecting sleeve 10. Two connecting rings 21 are provided between the first support ring 4 and the second support ring 6. The two connecting rings 21 are connected by an elastic metal sheet 20. The elastic metal sheet 20 is spirally arranged and the elastic metal sheet 20 is slidably sleeved on the inner screw 1. In actual use, when the fastening nut 3 is tightened, the distance between the first support ring 4 and the second support ring 6 is reduced, and the two connecting rings 21 will be squeezed, causing the elastic metal sheet 20 to deform. Under the action of the elastic force of the elastic metal sheet 20, the fastening nut 3 will be pushed to generate thrust, thereby increasing the friction between the fastening nut 3 and the thread teeth of the inner screw 1 to prevent the fastening nut 3 from loosening.

[0028] like Figure 1 As shown, the adjacent surfaces of the first support ring 4 and the second support ring 6 are both installed with first anti-slip teeth 5, and the sides of the two connecting rings 21 away from each other are both installed with second anti-slip teeth 19. When the fastening nut 3 is tightened, the adjacent first anti-slip teeth 5 and second anti-slip teeth 19 are engaged with each other. Under the action of the first anti-slip teeth 5 and the second anti-slip teeth 19, the first support ring 4 and the connecting ring 21 as well as the second support ring 6 and the connecting ring 21 can be limited to avoid relative rotation between the first support ring 4 and the second support ring 6, and further prevent the wall fastening nut 3 from loosening during connection.

[0029] like Figure 1 and Figure 3As shown, a second expansion tube 15 is provided at the bottom of each first expansion tube 11. The top of each second expansion tube 15 is connected to the corresponding first expansion tube 11 via a first inclined surface 13. A push head 17 is connected to the bottom of the inner screw 1 via a second inclined surface 16. The push head 17 extends between the two second expansion tubes 15. When the proximal ends of the two second expansion tubes 15 abut against each other, a cylindrical space is formed between the two second expansion tubes 15. The diameter of the space is larger than the diameter of the inner screw 1 and smaller than the diameter of the push head 17. In actual use, when the fastening nut 3 is tightened, the push head 17 will extend into the second expansion tube 15, expand the second expansion tube 15, and make the second expansion tube 15 tightly against the inner wall of the wall mounting hole, completing the fixation.

[0030] like Figure 3 As shown, the first bevel 13 and the second bevel 16 have the same inclination angle. When the second bevel 16 contacts the inner surface of the first bevel 13, the push head 17 extends into the second expansion tube 15. Therefore, when tightening the fastening nut 3, the second bevel 16 will first move into the second expansion tube 15. Under the action of the second bevel 16, the second expansion tube 15 can be expanded, so that the inner screw 1 will not be stuck in the second expansion tube 15.

[0031] It should be noted that when the push head 17 moves into the second expansion tube 15, the extrusion force exerted on the push head 17 by the second expansion tube 15 is only a horizontal force (such as Figure 3 In this way, no additional force will be applied to the threads of the fastening nut 3 and the inner screw 1, thereby preventing the expansion bolt from slipping.

[0032] When the first and second expansion tubes 11 and 15 are moved to the preset positions, the staff tightens the fastening nut 3 and drives the inner screw 1 to move toward the outside of the installation hole. When the inner screw 1 moves, it drives the push head 17 to move, so that the push head 17 moves into the second expansion tube 15, and the two second expansion tubes 15 and the two first expansion tubes 11 are stretched to both sides. At the same time, each second expansion tube 15 is also stretched open by the push head 17, so that the second anti-slip teeth 14 on the second expansion tube 15 and the first anti-slip teeth 12 ends on the first expansion tube 11 are tightly against the inner wall of the installation hole, fixing the expansion bolt in the installation hole and fixing it. When the nut 3 is tightened, the first anti-slip teeth 5 and the second anti-slip teeth 19 can cooperate with each other to limit the position of the nut 3 and prevent the nut 3 from rotating on its own, thereby further enhancing the anti-loosening effect of the nut 3.

[0033] Furthermore, if Figure 1 and Figure 4 As shown, the outer surface of each first expansion tube 11 is installed with a plurality of first anti-slip teeth 12, and the outer surface of each second expansion tube 15 is installed with a plurality of second anti-slip teeth 14. The first anti-slip teeth 12 and the second anti-slip teeth 14 are both inclined, and the ends of the first anti-slip teeth 12 and the second anti-slip teeth 14 are flush. In actual use, when the second expansion tube 15 and the first expansion tube 11 are stretched apart by the push head 17, the ends of the first anti-slip teeth 12 and the second anti-slip teeth 14 will be tightly against the inner wall of the wall mounting hole to prevent them from falling off.

[0034] Furthermore, if Figure 1 and Figure 3As shown, positioning grooves 2 are provided on both sides of the top of the inner screw 1, and positioning blocks 18 are installed on both sides of the inside of the connecting sleeve 10. One end of the positioning block 18 extends into the corresponding positioning groove 2 and fits with the inner wall clearance of the positioning groove 2. With the cooperation of the positioning block 18 and the positioning groove 2, the inner screw 1 and the connecting sleeve 10 can be limited to prevent the inner screw 1 from rotating with the fastening nut 3 when tightening the fastening nut 3.

[0035] Furthermore, the second expansion tube 15 is made of elastic metal material. In this way, when the push head 17 moves into the second expansion tube 15, it will not only push the two second expansion tubes 15 apart from each other on both sides of the wall mounting hole, but also push the second expansion tube 15 itself apart, so that the second anti-slip teeth 14 will fully contact the wall mounting hole.

[0036] Furthermore, the inner surface of the limiting skirt 8 is gap-fitted with the edge of the second connecting plate 9 , so that when in use, the second connecting plate 9 will not rock inside the limiting skirt 8 , thereby improving the stability between the first expansion tube 11 and the connecting sleeve 10 .

[0037] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An expansion bolt with an anti-slip wire, comprising a connecting sleeve (10), characterized in that: Two first expansion tubes (11) are symmetrically provided at the bottom of the connecting sleeve (10), and both of the two first expansion tubes (11) are arc-shaped structures. When the ends of the two first expansion tubes (11) are butted against each other, a cylindrical cavity is formed between the two first expansion tubes (11), and an inner screw (1) is provided in the cavity. Both ends of the inner screw (1) extend to the outside of the first expansion tube (11), and the top of the inner screw (1) also penetrates the connecting sleeve (10) and extends to the top of the connecting sleeve (10); A first connecting plate (7) is installed on the bottom edge of the connecting sleeve (10), and limiting skirts (8) are installed on both end edges of the bottom of the first connecting plate (7). The limiting skirt (8) has an L-shaped cross section, and a limiting groove is formed between the bottom of the limiting skirt (8) and the bottom of the first connecting plate (7). A second connecting plate (9) is installed on the top of each first expansion tube (11), and one end of each second connecting plate (9) extends into the corresponding limiting groove. A second expansion tube (15) is provided at the bottom of each first expansion tube (11), and the top of each second expansion tube (15) is connected to the corresponding first expansion tube (11) through a first inclined surface (13), and a push head (17) is connected to the bottom of the inner screw (1) through a second inclined surface (16), and the push head (17) extends between the two second expansion tubes (15); A fastening nut (3) is sleeved on the top of the inner screw (1), the fastening nut (3) is threadedly connected to the inner screw (1), and a first support ring (4) is connected to the bottom edge of the fastening nut (3), a second support ring (6) is installed on the top of the connecting sleeve (10), two connecting rings (21) are provided between the first support ring (4) and the second support ring (6), and the two connecting rings (21) are connected by an elastic metal sheet (20), the elastic metal sheet (20) is spirally arranged, and the elastic metal sheet (20) is slidably sleeved on the inner screw (1); First anti-slip teeth (5) are installed on adjacent surfaces of the first support ring (4) and the second support ring (6), and second anti-slip teeth (19) are installed on the sides of the two connecting rings (21) away from each other. When the fastening nut (3) is tightened, the adjacent first anti-slip teeth (5) and second anti-slip teeth (19) are meshed with each other.

2. The expansion bolt with anti-slip wire according to claim 1, characterized in that: The first inclined surface (13) and the second inclined surface (16) have the same inclination angle. When the second inclined surface (16) contacts the inner surface of the first inclined surface (13), the push head (17) extends into the interior of the second expansion tube (15).

3. The expansion bolt with anti-slip wire according to claim 1, characterized in that: The outer surface of each first expansion tube (11) is equipped with a plurality of first anti-slip teeth (12), and the outer surface of each second expansion tube (15) is equipped with a plurality of second anti-slip teeth (14). The first anti-slip teeth (12) and the second anti-slip teeth (14) are both arranged at an angle, and the ends of the first anti-slip teeth (12) and the second anti-slip teeth (14) are flush with each other.

4. The expansion bolt with anti-slip wire according to claim 1, characterized in that: Positioning grooves (2) are provided on both sides of the top of the inner screw (1), and positioning blocks (18) are installed on both sides of the interior of the connecting sleeve (10). One end of the positioning block (18) extends into the corresponding positioning groove (2) and is clearance-matched with the inner wall of the positioning groove (2).

5. The expansion bolt with anti-slip wire according to claim 1, characterized in that: When the two second expansion tubes (15) are close to each other at their ends, a cylindrical space is formed between the two second expansion tubes (15), and the diameter of the space is larger than the diameter of the inner screw (1) and smaller than the diameter of the push head (17).

6. The expansion bolt with anti-slip wire according to claim 5, characterized in that: The second expansion tube (15) is made of elastic metal material.

7. The expansion bolt with anti-slip wire according to claim 1, characterized in that: The inner surface of the limiting skirt (8) is gap-matched with the edge of the second connecting plate (9).

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