CN213744351U - Expansion screw - Google Patents

Abstract

The utility model belongs to the technical field of the fastener technique and specifically relates to an expansion screw. The utility model provides a following technical scheme: the utility model provides an expansion screw, includes screw rod, inflation sleeve pipe, flat pad and nut, its characterized in that: the flat cushion and the nut are integrally formed, a plurality of expansion pieces are arranged at one end, far away from the nut, of the expansion sleeve along the circumferential direction, the expansion pieces are elastic and bend inwards, the adjacent expansion pieces are connected through thin iron wires, one end, corresponding to the expansion pieces, of the screw rod is provided with a cutting block capable of cutting the thin iron wires, and the cutting block corresponds to the axial position of the thin iron wires; the utility model discloses remove the circular cone column structure of screw rod, solved the problem that the size that the inflation screw needs drilling is difficult to confirm.

Description

Expansion screw

Technical Field

The utility model belongs to the technical field of the fastener technique and specifically relates to an expansion screw.

Background

The expansion screw consists of a screw rod, an expansion pipe and other parts, the tail part of the screw rod is conical, and the inner diameter of the cone is larger than that of the expansion pipe. When the nut is screwed down, the screw rod moves outwards, the conical part moves through the axial movement of the threads, so that a large positive pressure is formed on the peripheral surface of the expansion pipe, and the angle of the cone is small, so that friction self-locking is formed among the wall body, the expansion pipe and the cone, and the fixing effect is achieved.

Need drill on the wall earlier before the installation inflation screw, but because the screw rod afterbody is coniform, its size slightly is greater than the inflation pipe for the size of drilling is not good to be held, and the hole drill has been little can make the screw rod afterbody can't stretch into downthehole, and the hole drill has been big can make the inflation pipe inflation back not enough to the pressure of hole inner wall, can't fix.

Disclosure of Invention

To the problem that exists among the prior art, the utility model provides an expansion screw.

In order to achieve the above purpose, the utility model provides a following technical scheme: the utility model provides an expansion screw, includes screw rod, inflation sleeve pipe, flat pad and nut, its characterized in that: flat pad and nut integrated into one piece, the one end that the nut was kept away from to the expansion sleeve pipe is equipped with a plurality of inflation pieces along circumference, the inflation piece has elasticity and to the inside side bending, and is adjacent connect through thin iron wire between the inflation piece, the one end that the screw rod corresponds the inflation piece is equipped with the stripping and slicing that can cut open thin iron wire, the stripping and slicing is corresponding with the axial position of thin iron wire.

Adopt above-mentioned technical scheme, the in-process that the nut was screwed up, the screw rod can outwards be removed, the stripping and slicing also outwards removes along with the screw rod, then cut thin iron wire, cut off the connection between the inflation piece, make the inflation piece resume the bending after not having the external force constraint, form great pressure to the wall body with the wall body contact, and then reach the fixed action, wherein, the circular cone column structure who has got rid of the screw rod makes the size of screw rod afterbody be less than the inflation pipe, the size in hole and the external diameter of inflation pipe unanimous can, make drilling more convenient, the size of having solved the inflation screw and needing drilling is difficult to the problem of confirming, secondly through flat pad and nut integrated into one piece, it is more convenient to install and operate.

Furthermore, the outer surface of the flat pad is provided with anti-skid grains.

By adopting the technical scheme, the friction force is increased, and the screw rod and the nut of the expansion screw can be prevented from rotating along with the nut in the screwing process of the nut.

Furthermore, the nut and the flat gasket form a hexagonal flange nut.

By adopting the technical scheme, the installation is convenient.

The utility model has the advantages that: the conical structure of the screw rod is removed, and the problem that the size of the expansion screw needing to be drilled is difficult to determine is solved.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

The following will further describe the embodiments of the present invention with reference to the drawings and examples.

An inflation screw as shown in fig. 1, including screw rod 1, expansion sleeve 2, flat pad 3 and nut 4 integrated into one piece, the one end that nut 4 was kept away from to expansion sleeve 2 is equipped with a plurality of inflation pieces 201 along circumference, inflation piece 201 has elasticity and inside side bend, and is adjacent connect through thin iron wire 5 between the inflation piece 201, the one end that screw rod 1 corresponds inflation piece 201 is equipped with the cutting block 6 that can cut open thin iron wire 5, cutting block 6 is corresponding with the axial position of thin iron wire 5, be equipped with anti-skidding line 301 on the surface of flat pad 3, nut 4 constitutes hexagonal flange face nut with flat pad 3.

Claims (3)

1. The utility model provides an expansion screw, includes screw rod, inflation sleeve pipe, flat pad and nut, its characterized in that: flat pad and nut integrated into one piece, the one end that the nut was kept away from to the expansion sleeve pipe is equipped with a plurality of inflation pieces along circumference, the inflation piece has elasticity and to the inside side bending, and is adjacent connect through thin iron wire between the inflation piece, the one end that the screw rod corresponds the inflation piece is equipped with the stripping and slicing that can cut open thin iron wire, the stripping and slicing is corresponding with the axial position of thin iron wire.

2. The expansion screw of claim 1, wherein: and anti-skid grains are arranged on the outer surface of the flat pad.

3. An expansion screw according to claim 1, wherein: the nut and the flat gasket form a hexagonal flange nut.

Images