CN216343256U

CN216343256U - Expansion bolt

Info

Publication number: CN216343256U
Application number: CN202122161074.1U
Authority: CN
Inventors: 潘云峰; 潘树江
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-09-08
Filing date: 2021-09-08
Publication date: 2022-04-19
Anticipated expiration: 2031-09-08
Also published as: WO2023036107A1; CN216913719U; WO2023036106A1

Abstract

The utility model provides an expansion bolt which comprises a bolt main body, a sleeve, a washer and a nut, wherein the bolt main body comprises a bolt head, a bolt body and a bolt tail of a thread section, a cutting groove is formed in the position, close to the bolt head, of the sleeve, the bolt head is conical, the conical degree is smaller than or equal to 1:2, the inner diameter of the sleeve is the same as the thread diameter of the bolt tail, and the sleeve and the bolt tail are in clearance fit. The utility model has good stability, firm installation and repeated use.

Description

Expansion bolt

Technical Field

The utility model belongs to the field of fasteners, and particularly relates to an expansion bolt and a disassembling tool thereof.

Background

Expansion bolts are a type of fastener currently commonly used for mounting objects, and existing expansion bolts are sometimes good and sometimes difficult to use. The main reason for difficult use is: 1. after the bolt is knocked into the drill hole, if the error of the drill hole is larger, the whole bolt can rotate when the nut is screwed down, and the nut cannot be screwed down. Sometimes, the sleeve is not moved, the bolt body can also rotate, and the nut cannot be screwed tightly; 2. sometimes, the bolt body of the bolt is loosened and the nut cannot be screwed up by slightly screwing after the nut is screwed up, so that the bolt cannot be screwed up again when feeling a certain tightness; 3. sometimes, the nut is not screwed up all the time, and the sleeve at the drilling hole is deformed and cannot be screwed up; 4. the expansion bolt can be loosened or even separated soon after the object with large shaking, vibration or pulling-out force is installed, so that a lot of troubles are caused and a lot of potential safety hazards are caused; 5. the bolt tail of the bolt has large swing amplitude, so that the drilling is easy to damage, and the installed objects are difficult to standardize; 6. the tightened bolt is generally difficult to remove, and even if the bolt is removed with great force, the sleeve is easily damaged and cannot be reused.

SUMMERY OF THE UTILITY MODEL

In view of the shortcomings in the background art, the first purpose of the utility model is to provide an expansion bolt which is good in stability, firm in installation and reusable, and the second purpose is to provide a special tool for assembling and disassembling the expansion bolt.

The first object of the present invention is achieved by: an expansion bolt comprises a bolt main body, a sleeve, a washer and a nut, wherein the bolt main body comprises a bolt head, a bolt body and a bolt tail of a thread section, a cutting groove is formed in the position, close to the bolt head, of the sleeve, the bolt head is conical, the conical degree is smaller than or equal to 1:2, the inner diameter of the sleeve is the same as the thread diameter of the bolt tail, and the sleeve and the bolt tail are in clearance fit.

The expansion bolt head in the prior art is shorter, namely the taper of the bolt head is far larger than 1:2, the wall of a sleeve is thinner, and the inner diameter of the sleeve is far larger than the outer diameter of the bolt tail of the bolt body; the bolt head adopts a long head, namely the taper of the bolt head is less than or equal to 1:2, and simultaneously, under the condition of meeting the assembly condition, the inner diameter of the sleeve is the same as the outer diameter of the bolt tail of the bolt body as much as possible so as to increase the wall thickness of the sleeve to the maximum extent, wherein the wall thickness is more than 2 to 3 times of the wall thickness of the sleeve in the prior art, and the bolt head has the following beneficial effects: 1. when the bolt head is installed and used, after the bolt head is squeezed into the sleeve, the thicker the sleeve wall is, the larger the expansion amplitude is, the larger the expansion force is, the higher the stability is, and the bolt after being screwed is not easy to loosen and fall off. 2. The bolt head adopts a 'long head' structure, so that an installer can flexibly use expansion force on the wall of a drilled hole generated by expansion amplitude formed by different bolt head inclined surface sections acting on the sleeve according to the error of the wall drilled hole made of different materials to fasten the bolt. In actual use, the maximum expansion amplitude of the sleeve is generally not used for fixing the bolt, generally, the expansion amplitude is increased by screwing more nuts when the sleeve is soft or the drilled hole is larger, otherwise, the nuts can be screwed less, and a user can select different installation tightness. 3. The "long head" in combination with the "thick wall" construction also allows the expansion bolts of the present invention to be "tighter and tighter" because the expansion forces generated by the maximum expansion of the casing are generally not available, and most often are generated by the expansion of the mid-section of the head ramp and the casing front end. The bolt main body can be driven to move outwards when the fixed object moves outwards, and the bolt main body is fixed by the friction force between the sleeve and the wall of the drill hole, so that the bolt head can be further extruded into the sleeve to increase the expansion amplitude by moving outwards, the expansion force at the bolt head is automatically enhanced, the fastening degree is automatically improved, the bolt becomes stable, and the expansion bolt has the self-stabilizing function.

Further, the bolt head is provided with a rib, and the width of the rib close to the sleeve end is smaller than that of the cutting groove. The convex edges arranged in the expansion bolt are embedded into the cutting grooves, the sleeves can be driven to rotate together when the bolt is taken out, the bolt can be taken out easily, the taken-out expansion bolt can be reused due to small deformation of the sleeves, waste is reduced, and social resources are saved.

Preferably, the width of the other end of the rib is greater than the width of the end adjacent the sleeve. This arrangement facilitates the engagement of the rib in and close fit with the slot.

Further, the slot of the sleeve has a through slot extending to the other end of the sleeve. The arrangement of the through cutting groove can enable the sleeve to shrink due to the reduction of the drill hole when the bolt is knocked in, so that the applicability of the sleeve is improved, secondly, the sleeve can clamp the bolt main body through shrinkage, the nut can be screwed conveniently, the shaking is further reduced, thirdly, the sleeve can rotate along with the bolt main body when the bolt is taken out, the fixed screw layer fragments of the drill hole are scraped out through rotation, the fragments are contained, and the bolt can be taken out easily; the through slot also has the function of wedging a wedge from the drilling hole to increase the tightness of the bolt during special installation.

Preferably, the diameter of the bolt body is the same as the major diameter of the thread of the bolt tail. The major diameter of the bolt tail thread of the existing bolt is generally larger than the diameter of the bolt body, and the diameter of the bolt body and the major diameter of the bolt tail thread are arranged in the same way, so that the inner diameter of the sleeve can be reduced under the condition that the strength of the bolt body is the same, and the wall thickness of the sleeve can be further increased.

Preferably, the number of the convex ribs and the grooves is 4, and the convex ribs and the grooves correspond to each other in position.

Preferably, the outer diameter of the casing is transition fit with the inner diameter of the borehole for installation. Due to the arrangement of the through cutting groove, the sleeve can be reduced when the knock-in bolt is installed, so that the outer diameter of the sleeve can be further increased, the wall thickness of the sleeve is further increased, and the installation applicability and reliability of the sleeve are improved.

Compared with the prior art, the expansion bolt of the utility model has the following advantages:

the second object of the present invention is achieved by: the tool for disassembling and assembling the expansion bolt comprises a tool main body, wherein a sleeve for loosening and tightening the nut and a jacking pipe for jacking the nut into the sleeve are arranged on the tool main body, the outer diameter of the jacking pipe is smaller than or equal to that of the sleeve, and the inner diameter of the jacking pipe is larger than or equal to that of the sleeve.

Furthermore, a nut is further arranged on the tool main body, the nut is a blind hole, threads are arranged in the nut, and the threads are matched with the threads on the bolt tail.

Preferably, the tool main body is cross-shaped, the number of the sleeves, the number of the jacking pipes and the number of the screw taking nuts are two, the two sleeves are arranged at two ends of the cross-shaped tool main body, the other two jacking pipes are arranged at the other two ends of the cross-shaped tool main body, the two screw taking nuts are arranged at the center of the cross-shaped tool main body, and the two sleeves, the two jacking pipes and the two screw taking nuts are different in size, so that two sets of disassembling tools with two specifications are formed.

The expansion bolt can be conveniently and effectively assembled and disassembled by using the disassembling tool.

Drawings

FIG. 1 is a schematic structural view of an expansion bolt of the present invention;

FIG. 2 is a schematic cross-sectional view of FIG. 1;

FIG. 3 is a schematic view of the bolt body;

FIG. 4 is a partial schematic view of the plug of FIG. 3;

FIG. 5 is a view from direction A-A of FIG. 3;

FIG. 6 is a schematic view of a cannula;

FIG. 7 is a schematic top view of FIG. 6;

FIG. 8 is a schematic right side view of FIG. 6;

FIG. 9 is a schematic structural view of a tool for setting and removing an expansion bolt according to the present invention;

FIG. 10 is a schematic left side view of FIG. 9;

FIG. 11 is a view from the direction B-B in FIG. 10;

in the figure: 1-bolt body, 11-bolt head, 111-rib, 12-bolt body, 13-bolt tail, 2-sleeve, 21-cutting groove, 211-through cutting groove, 3-washer, 4-nut, 5, tool body, 51-sleeve, 52-top pipe and 53-nut taking.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The expansion bolt shown in fig. 1 to 8 comprises a bolt body 1, a sleeve 2, a washer 3 and a nut 4, wherein the bolt body 1 comprises a bolt head 11, a bolt body 12 and a bolt tail 13 with a threaded section, the bolt head 11 is conical, the taper of the taper is 1:5, the bolt head 11 is provided with 4 ribs 111, the width b of the end of the rib 111 close to the sleeve 2 is smaller than the width a of the cutting slot 21, the width c of the other end of the rib 111 is larger than the width b close to the sleeve 2, the diameter of the bolt body 12 is the same as the thread major diameter of the bolt tail 13, the sleeve 2 is provided with 4 cutting slots 21 close to the bolt head 11, one of which is a through slot 211 extending to the other end of the sleeve 2, the inner diameter of the sleeve 2 is the same as the major diameter of the thread of the bolt tail 13, the sleeve 2 is in clearance fit with each other, the outer diameter of the sleeve 2 is in transition fit with the inner diameter of a drill hole for installation, and the sleeve 2 can also realize the thick wall by overlapping and sleeving two or more thin-wall pipes together.

The working principle and the working process of the expansion bolt are as follows: when the bolt is installed, the bolt is knocked into a drill hole, and the sleeve 2 is in transition fit with the drill hole, so that the sleeve 2 is reduced due to the through cutting groove 211 in the process and is tightly attached to the bolt body 12, the bolt body 1 is enabled to be less prone to moving, the nut 4 is screwed, and the bolt head 11 is squeezed into the sleeve 2 to enable the sleeve 2 to expand, so that the bolt is fastened; when the bolt body 1 is disassembled, the bolt body 1 is slightly knocked into a drill hole, the sleeve 2 is small in deformation due to the thick wall, the sleeve is still in an elastic deformation stage or a micro plastic deformation stage generally, the sleeve 2 is easy to shrink and restore, the bolt body 1 is rotated, the rib 111 is located in the cutting groove 21, the sleeve 2 is driven to rotate together, the chips on the thread fixing layer of the drill hole are rotationally scraped out, and the chips are accommodated by the cutting groove 21 and the through cutting groove 211, so that the bolt is easily taken out.

The tool for disassembling and assembling the expansion bolt shown in fig. 9 to 11 comprises a cross-shaped tool body 5, wherein two ends of the tool body 5 are provided with sleeves 51 for tightening and loosening nuts 4, the sleeves 51 are outer hexagonal or double offset ring socket wrenches, the other two ends are provided with jacking pipes 52 for jacking the casing 2, the outer diameter of the jacking pipes 52 is slightly smaller than the outer diameter of the casing 2, the inner diameter of the jacking pipes is slightly larger than the inner diameter of the casing 2, the center of the jacking pipes is provided with two back-to-back nut-taking nuts 53, each nut-taking nut 53 is a blind hole and internally provided with threads, the threads are matched with the threads of the bolt tail 13, one group of the sleeves 51, the jacking pipes 52 and the nut-taking nuts 53 is 12, and the other group of the sleeves 51, the jacking pipes 52 and the nut-taking nuts 53 is 14.

During installation, the expansion bolt is placed in a drill hole, the sleeve 2 is pushed in by using a top pipe 52 of an assembling and disassembling tool after the sleeve 2 is blocked, and then the nut 4 is screwed by using a sleeve 51 to finish installation; during disassembly, the nut 4 is loosened by the sleeve 51, the bolt tail 13 is slightly knocked into the drill hole, then the taking nut 53 is screwed into the bolt tail 13, the bolt tail 13 is pushed to the bottom of the taking nut 53 and then continuously rotates, the taking nut 53 drives the bolt body 1 to rotate, the convex ridge 111 on the bolt body 1 drives the sleeve 2 to rotate, and therefore the expansion bolt is easily taken out.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. An expansion bolt, includes bolt main part (1), sleeve pipe (2), packing ring (3) and nut (4), bolt main part (1) is including tieing head (11), bolt body (12) and bolt tail (13) of screw thread section, sleeve pipe (2) are close to tieing head (11) end is equipped with grooving (21), its characterized in that: the bolt head (11) is conical, the conical degree of the conical shape is less than or equal to 1:2, the inner diameter of the sleeve (2) is the same as the thread diameter of the bolt tail (13), and the inner diameter and the thread diameter are in clearance fit with each other.

2. The expansion bolt as claimed in claim 1, wherein: the bolt head (11) is provided with a rib (111), and the width (b) of the rib (111) close to the end of the sleeve (2) is smaller than the width (a) of the cutting groove (21).

3. The expansion bolt as claimed in claim 2, wherein: the width (c) of the other end of the rib (111) is greater than the width (b) of the end close to the sleeve (2).

4. An expansion bolt according to any one of claims 1 to 3, characterized in that: the slot (21) of the sleeve (2) has a through slot (211) extending to the other end of the sleeve (2).

5. The expansion bolt as claimed in claim 4, wherein: the diameter of the bolt body (12) is the same as the major diameter of the thread of the bolt tail (13).

6. The expansion bolt as claimed in claim 4, wherein: the outer diameter of the sleeve (2) is in transition fit with the inner diameter of a drill hole for installation.