CN213954107U

CN213954107U - Step-by-step pre-fastening expansion bolt

Info

Publication number: CN213954107U
Application number: CN202023076049.5U
Authority: CN
Inventors: 董立夫; 董永宁
Original assignee: Shanxi Lifu Industry And Trade Co ltd
Current assignee: Shanxi Lifu Industry And Trade Co ltd
Priority date: 2020-12-18
Filing date: 2020-12-18
Publication date: 2021-08-13
Anticipated expiration: 2030-12-18

Abstract

The utility model provides a step-by-step pre-fastening expansion bolt, relating to a bolt fastener; the expansion sleeve is arranged outside the screw rod, and the rear end of the screw rod is connected with a nut; the screw is provided with a plurality of conical bosses, and the longer radius bottom surface of the most front boss of the screw is back to the nut; the longer radius bottom surfaces of other bosses face the nut; a plurality of expansion ring openings are formed in the expansion sleeve, and the positions of the expansion ring openings correspond to the bosses on the screw; a compression sleeve is sleeved outside the screw rod and is positioned between the expansion sleeve and the nut; after entering the wall body, the utility model carries out pre-fastening and reinforced fastening step by step in advance, and forms a stable whole with the wall body; can realize the anchor of full drilling, it is fixed effectual, intensity effectively improves.

Description

Step-by-step pre-fastening expansion bolt

Technical Field

The utility model relates to a bolt fastener specifically is a fasten expansion bolts step by step in advance.

Background

At present, expansion bolts in the market generally utilize the bolt tip toper to realize expansion fixation after expanding the expansion sleeve, and this kind of expansion principle defect is many: firstly, the end part of the bolt is a flush head, and the bolt is difficult to place in a hole; secondly, the expansion multiple is small, the expansion friction points are few, and the fixed strength is too low and unstable; furthermore, when the outer hanger is fixed, since the pre-fastening cannot be performed, when the outer hanger is fixed, it is difficult to screw the nut. When the bolt is fastened, the screw rod is pulled out from inside to outside all the time, the anchoring section is shallow, the bearing point is only on the surface layer of the wall body, the anchoring strength is low, and the potential safety hazard is great; in conclusion, the fixing effect is poor. Certain safety risk and waste of secondary installation or maintenance exist in the use process in the later period, and even the wall body is damaged.

SUMMERY OF THE UTILITY MODEL

The utility model overcomes prior art's is not enough, provides a fasten expansion bolts in advance step by step, solves the defect that current expansion bolts exists.

In order to achieve the above purpose, the present invention is achieved by the following technical solutions.

A step-by-step pre-fastened expansion bolt comprises a screw rod, an expansion sleeve and a nut, wherein the expansion sleeve and the nut are arranged outside the screw rod; the screw is provided with a plurality of conical bosses, and the longer radius bottom surface of the most front boss of the screw is back to the nut; the longer radius bottom surfaces of other bosses face the nut; a plurality of expansion ring openings are formed in the expansion sleeve, and the positions of the expansion ring openings correspond to the bosses on the screw; and a compression sleeve is sleeved outside the screw rod and is positioned between the expansion sleeve and the nut.

Furthermore, the end head of the front end of the screw rod is a conical table, and the bottom surface of the conical table with the shorter radius is back to the nut.

Further, a nut washer is arranged on the inner side of the nut.

Furthermore, the cross section of the boss is circular.

Furthermore, the lug boss and the screw rod are arranged in a split movable manner.

Furthermore, the expansion sleeve is of a split and multi-section structure, and the expansion sleeve and the bosses are alternately sleeved on the screw rod.

Furthermore, the bosses are uniformly distributed on the screw rod.

Furthermore, a plurality of expansion ring openings are arranged on the same section of the expansion sleeve.

The utility model discloses produced beneficial effect for prior art does:

1. the utility model can realize that the expansion bolt is pre-fastened and reinforced fastened step by step in advance after entering the wall body, and forms a stable whole with the wall body; the installation is convenient.

2. The utility model discloses the toper end that sets up puts into the wall body drilling with expansion bolts more easily.

3. The front end of the expansion bolt is expanded in a forward and reverse inner supporting mode, the realized expansion amplitude is increased by friction resistance, full-drilling anchoring can be realized, the fixing strength and the safety stability are greatly improved, and the safety accident occurrence coefficient is reduced.

4. Expansion bolts can realize full drilling anchor, and the structure is more stable, connects more firmly.

The utility model discloses the maintenance that significantly reduces, the fault rate is lower, and is fixed effectual, and intensity improves greatly, and efficiency is increased substantially, the repeated input that reduces, the installation use cost that significantly reduces.

Drawings

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly understood, the following drawings are combined for illustration:

fig. 1 is a schematic structural view of an expansion bolt according to the embodiment.

Fig. 2 is a schematic structural view of the expansion bolt according to the embodiment when fastened.

FIG. 3 is a cross-sectional view of an embodiment of an expansion sleeve at an opening of an expansion ring.

FIG. 4 is a development view of the expansion sleeve according to the embodiment.

In the figure, 1 is a screw, 2 is an expansion sleeve, 3 is a nut, 4 is a boss, 5 is an expansion ring opening, 6 is a compression sleeve, 7 is a front end head, 8 is a nut washer, 9 is a drill hole, 10 is a wall body, 401 is a first-stage forward expansion joint, 402 is a second-stage reverse expansion joint, 403 is a third-stage reverse expansion joint, 404 is a fourth-stage reverse expansion joint, and 405 is a fifth-stage reverse expansion joint.

Detailed Description

In order to make the technical problem, technical scheme and beneficial effect that the utility model will solve more clearly understand, combine embodiment and attached drawing, it is right to go on further detailed description the utility model discloses. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solution of the present invention is described in detail below with reference to the embodiments and the drawings, but the scope of protection is not limited thereto.

As shown in fig. 1, the stepwise pre-fastened expansion bolt comprises a screw 1, four expansion sleeves 2, a nut 3 and five conical bosses 4, wherein a boss 4 is sleeved at the front end of the screw 1 to form a primary forward expansion joint 401, then a first expansion sleeve 2 is sleeved, then a second boss 4 is sleeved to form a secondary reverse expansion joint 402, then a third reverse expansion joint 403 formed by the second expansion sleeve 2 and the third boss 4, a fourth reverse expansion joint 404 formed by the third expansion sleeve 2 and the fourth boss 4, a fourth expansion sleeve 2 and a fifth reverse expansion joint 405 formed by the fifth boss 4 are sequentially sleeved, then a compression sleeve 6 is sleeved, the nut 3 is connected at the rear end of the screw 1, and a nut gasket 8 is arranged on the inner side of the nut 3; wherein, the longer radius bottom surface of the primary forward expansion joint 401 is back to the nut 3; the longer radius bottom surfaces of the second-stage reverse expansion joint 402, the third-stage reverse expansion joint 403, the fourth-stage reverse expansion joint 404 and the fifth-stage reverse expansion joint 405 face the nut 3; the first section of expansion sleeve 2 is twice as long as the other expansion sleeves 2, and two ends of the first section of expansion sleeve are respectively and uniformly provided with four expansion ring openings 5, one end of each of the other expansion sleeves 2 is provided with four expansion ring openings 5, and the positions of the expansion ring openings 5 correspond to the bosses 4 on the screw rod 1 (as shown in fig. 3 and 4). The front end 7 of the screw rod 1 is a conical table, and the bottom surface of the conical table with the shorter radius is back to the nut 3. In the embodiment, a structure of five bosses 4 is adopted, and the number of the bosses 4 and the number of the expansion sleeves 2 can be adjusted according to factors such as the length of an actual hole.

As shown in fig. 2, it is a schematic structural view of the expansion bolt in the use process of entering the wall body; this expansion bolts gets into behind the wall body, because the one-level forward expansion joint 401 and the reverse expansion joint 402 of second grade of screw rod 1 front end cooperate, and multistage reverse expansion joint, realize that expansion bolts forms the multiple spot friction expansion contact with the wall body in earlier stage, thereby realize carrying out pretension step by step in advance and strengthen the fastening, when fixing expansion bolts, can form the stable whole of high strength with the wall body, can realize full drilling anchor simultaneously, it is shallow to have solved current expansion bolts anchor section, easily take off insecure problem, improve expansion bolts's fixed strength greatly, the installation of also being convenient for simultaneously.

The end of the expansion bolt is expanded in a forward and reverse internal supporting mode, the expansion amplitude and the reverse expansion sleeve are larger in friction resistance, the fixing strength and the safety stability are greatly improved, full drilling anchoring is basically realized, and the safety accident occurrence coefficient is reduced; and the expansion bolt is more easily put into the drilling hole 9 of the wall body 10 through the front end head 7 in the shape of the conical table, and the expansion bolt is particularly suitable for the drilling hole walls of the wall bodies with different hardness, so that the maintenance is greatly reduced, the later safety failure rate is lower, the fixing effect is good, the strength is greatly improved, the efficiency is greatly improved, and the wall body is more effectively protected.

The above description is for further details of the present invention with reference to specific preferred embodiments, and it should not be understood that the embodiments of the present invention are limited thereto, and it will be apparent to those skilled in the art that the present invention can be implemented in a plurality of simple deductions or substitutions without departing from the scope of the present invention, and all such alterations and substitutions should be considered as belonging to the present invention, which is defined by the appended claims.

Claims

1. A step-by-step pre-fastened expansion bolt comprises a screw rod (1), an expansion sleeve (2) and a nut (3), wherein the expansion sleeve (2) and the nut (3) are arranged outside the screw rod (1), the front end of the expansion sleeve (2) is flush with the front end of the screw rod (1), and the rear end of the screw rod (1) is connected with the nut (3); the screw is characterized in that a plurality of conical bosses (4) are arranged on the screw (1), and the longer radius bottom surface of the most front boss (4) of the screw (1) is back to the nut (3); the longer radius bottom surfaces of other bosses (4) face the nut (3); a plurality of expansion ring openings (5) are formed in the expansion sleeve (2), and the positions of the expansion ring openings (5) correspond to the bosses (4) on the screw (1); and a compression sleeve (6) is further sleeved outside the screw rod (1), and the compression sleeve (6) is positioned between the expansion sleeve (2) and the nut (3).

2. The progressive pre-tightening expansion bolt as recited in claim 1, wherein the front end (7) of the screw (1) is a conical table, and the bottom surface of the shorter radius of the conical table faces away from the nut (3).

3. A progressive pre-tightening expansion bolt according to claim 1, characterised in that the nut (3) is provided with a nut washer (8) on the inside.

4. A progressive pre-tightened expansion bolt according to claim 1, characterised in that the cross-section of the boss (4) is circular.

5. The progressive pre-tightening expansion bolt as recited in claim 1, wherein the boss (4) is movably disposed separately from the screw (1).

6. The progressive pre-tightening expansion bolt as claimed in claim 5, wherein the expansion sleeve (2) is of a split and multi-section structure, and the expansion sleeve (2) and the bosses (4) are alternately sleeved on the screw rod (1).

7. A progressive pre-tightened expansion bolt according to claim 1, characterised in that said bosses (4) are evenly distributed on the screw (1).

8. A progressive pre-tightened expansion bolt according to claim 1, characterised in that the expansion sleeve (2) is provided with a plurality of expansion ring openings (5) in the same cross-section.