CN214196892U

CN214196892U - Novel expansion screw

Info

Publication number: CN214196892U
Application number: CN202022348668.9U
Authority: CN
Inventors: 张陈泓; 李小平
Original assignee: Individual
Current assignee: Zhejiang Swordfish Construction Technology Co ltd
Priority date: 2020-10-14
Filing date: 2020-10-14
Publication date: 2021-09-14
Anticipated expiration: 2030-10-14

Abstract

The utility model provides a novel expansion screw belongs to mechanical technical field. It has solved prior art and has had the poor problem of stability. This novel inflation screw includes screw rod, inflation pipe and nut, and above-mentioned inflation pipe is the tubulose, and above-mentioned screw rod lower extreme has convex expansion section, and above-mentioned inflation pipe lower extreme has a plurality of breachs, forms the inflation piece that is the lamella form between two adjacent breachs, and above-mentioned inflation pipe box is on the screw rod and the inflation piece supports and leans on in expansion section department, and above-mentioned nut box is at screw rod upper end and both threaded connection, and above-mentioned inflation pipe is located between nut and expansion section, outside department of inflation piece lower extreme has anti group structure, can increase behind the inflation screw expansion state through anti group structure and the building inflation hole between anti group intensity. This novel inflation screw stability is high.

Description

Novel expansion screw

Technical Field

The utility model belongs to the technical field of machinery, a novel inflation screw is related to.

Background

The expansion screw is a fastener, and the expansion screw is fixed by utilizing wedge-shaped slope to promote expansion to generate friction gripping force so as to achieve the fixing effect. That is, after the expansion pipe is extruded by the expansion section at the end part of the bolt, the end part of the expansion pipe is expanded, and the expansion pipe is embedded in the expansion hole of the building, so that the end part of the whole expansion bolt is stably connected with the building through the expanded expansion pipe.

The expansion pipe in the existing expansion screw is usually in a tubular integrated structure, and the expansion pipe is in tight fit with an expansion hole of a building after being expanded due to direct contact between the expansion pipe and the expansion hole. It can be seen that the existing expansion screw has lower anti-pulling strength and poorer stability.

Disclosure of Invention

The utility model aims at the above-mentioned problem that prior art exists, provide a high and compact structure's of stability novel inflation screw.

The purpose of the utility model can be realized by the following technical proposal:

the utility model provides a novel expansion screw, includes screw rod, expansion pipe and nut, and above-mentioned expansion pipe is the tubulose, and above-mentioned screw rod lower extreme has convex expansion section, and above-mentioned expansion pipe lower extreme has a plurality of breachs, forms the inflation piece that is the lamella form between two adjacent breachs, and above-mentioned expansion pipe box just the inflation piece supports and leans on in expansion section department on the screw rod, and above-mentioned nut cover is in screw rod upper end and both threaded connection, and above-mentioned expansion pipe is located between nut and expansion section, its characterized in that, outside department of inflation piece lower extreme has anti group structure, can increase behind the expansion screw inflation state and the building inflation hole between anti group intensity through anti group structure.

In the initial state, the expansion pipe is sleeved on the screw rod, and two ends of the expansion pipe are respectively abutted against the expansion section and the nut.

After one end of the expansion section on the expansion screw is embedded into an expansion hole of a building, external force is applied to rotate the nut. The expansion pipe is pushed and extruded by the nut, and the expansion sheet at the lower end of the expansion pipe deforms and expands along the expansion section.

Because the outside department of inflation piece lower extreme has anti dialling the structure, can effectively increase the anti intensity of dialling between inflation screw and the building under the effect of anti dialling the structure, improved its connection stability.

Of course, in order to improve the installation efficiency and reduce the labor intensity of the operation during the installation process, an electric torque wrench can be adopted to realize quick installation.

In the novel expansion screw, the anti-poking structure is a blade protruding from the outer side of the expansion sheet.

The inner end of the cutting edge is stably connected with the expansion sheet, and the outer end of the cutting edge is provided with a sharp cutting edge. The structure enables the blade to be stably embedded in a building, further improves the connection stability between the expansion sheet and the building, and effectively improves the poking resistance strength of the expansion sheet.

In the above-mentioned novel expansion screw, the quantity of cutting edge is a plurality of, and a plurality of cutting edges from top to bottom align to grid is in inflation piece lower extreme department.

The arrangement of a plurality of cutting edges can further increase its resistance to plucking intensity.

In the novel expansion screw, the cutting edge and the expansion sheet are of an integrated structure.

This can suitably improve the compactness thereof.

In the novel expansion screw, the expansion section is conical.

After the expansion pipe is pushed and extruded by the nut, the expansion sheet can gradually deform along the expansion section.

In the novel expansion screw, the outer side of the expansion pipe is provided with a limit mark, and the limit mark is close to the upper end of the expansion pipe.

The preassembling position of the expansion screw can be intuitively informed to an assembler through the limit mark, so that the limit mark of the expansion screw is aligned with the port of the expansion hole in the building.

In the above-mentioned new expansion screw, the limit mark is a groove recessed in a ring shape.

In the above new expansion screw, a washer is further included, the washer is sleeved on the screw rod and is tightly pressed between the nut and the expansion pipe.

The nut can be stably pushed and extruded on the expansion pipe through the washer.

Compared with the prior art, the novel expansion screw has the anti-pulling structure on the expansion sheet of the expansion pipe, so that the anti-pulling strength between the expansion screw and a building can be effectively improved under the action of the anti-pulling structure, and the stability of the novel expansion screw is higher.

Simultaneously, can also inform installer this expansion screw's pre-installation position under limit mark's effect, can effectively improve the installation effectiveness like this and install portably, have very high practical value.

In addition, the anti-poking structure is positioned at the lower end of the expansion sheet, so that the expansion sheet does not occupy extra space, and the structure is compact.

Drawings

Fig. 1 is a schematic structural diagram of the novel expansion screw.

Fig. 2 is a schematic sectional structure view of the expansion screw of the present invention.

Fig. 3 is a schematic structural diagram of the expansion screw of the present invention in an expanded connection state.

Fig. 4 is a schematic sectional structure view of the expansion screw of the present invention in an expanded connection state.

In the figure, 1, a screw; 1a, an expansion section; 2. an expansion tube; 2a, an expansion sheet; 2a1, knife edge; 2b, limiting marks; 3. a nut; 4. a gasket.

Detailed Description

As shown in fig. 1 and 2 and fig. 3 and 4, the novel expansion screw includes a screw rod 1, an expansion tube 2 and a nut 3, the expansion tube 2 is tubular, the lower end of the screw rod 1 has a convex expansion section 1a, the lower end of the expansion tube 2 has a plurality of gaps, a petal-shaped expansion piece 2a is formed between two adjacent gaps, the expansion tube 2 is sleeved on the screw rod 1, the expansion piece 2a abuts against the expansion section 1a, the nut 3 is sleeved on the upper end of the screw rod 1 and is in threaded connection with the screw rod 1, the expansion tube 2 is positioned between the nut 3 and the expansion section 1a, the outer side of the lower end of the expansion piece 2a has an anti-pulling structure, and the anti-pulling strength between the expansion screw and the expansion hole of the building after the expansion state can be increased by the anti-pulling structure.

The poking-resisting structure is a blade 2a1 protruding from the outer side of the expansion sheet 2 a.

The number of the cutting edges 2a1 is several, and the cutting edges 2a1 are evenly arranged at the lower end of the expansion sheet 2a from top to bottom.

The blade 2a1 and the expansion sheet 2 are of an integral structure.

The expansion section 1a is conical.

The expansion pipe 2 is provided with a limit mark 2b at the outer side, and the limit mark 2b is close to the upper end of the expansion pipe 2.

The limiting mark 2b is a concave groove in an annular shape.

And the washer 4 is sleeved on the screw rod 1, and the washer 4 is tightly pressed between the nut 3 and the expansion pipe 2.

Claims

1. The utility model provides a novel expansion screw, includes screw rod, expansion pipe and nut, and above-mentioned expansion pipe is the tubulose, and above-mentioned screw rod lower extreme has convex expansion section, and above-mentioned expansion pipe lower extreme has a plurality of breachs, forms the inflation piece that is the lamella form between two adjacent breachs, and above-mentioned expansion pipe box just the inflation piece supports and leans on in expansion section department on the screw rod, and above-mentioned nut cover is in screw rod upper end and both threaded connection, and above-mentioned expansion pipe is located between nut and expansion section, its characterized in that, outside department of inflation piece lower extreme has anti group structure, can increase behind the expansion screw inflation state and the building inflation hole between anti group intensity through anti group structure.

2. The novel expansion screw as claimed in claim 1, wherein the anti-pick structure is a blade protruding from the outer side of the expansion sheet.

3. The novel expansion screw as claimed in claim 2, wherein the number of the blades is several, and several blades are uniformly arranged at the lower end of the expansion sheet from top to bottom.

4. The novel expansion screw of claim 3 wherein said blade and expansion blade are of one-piece construction.

5. The novel expansion screw of claim 4 wherein said flared section is tapered.

6. The novel expansion screw of claim 5, wherein the expansion tube has a limit marker on the outside, the limit marker being located near the upper end of the expansion tube.

7. The new expansion screw of claim 6 wherein said limit mark is a groove recessed in a ring shape.

8. The expansion screw of claim 7 further comprising a washer which is fitted over the shank and which is compressed between the nut and the expansion tube.