CN219888437U

CN219888437U - Expansion screw

Info

Publication number: CN219888437U
Application number: CN202223594761.3U
Authority: CN
Inventors: 李云; 何佳建; 罗全和; 盛应青; 周占学; 刘泳琳
Original assignee: Foshan Kuiloon Metal Products Co ltd
Current assignee: Foshan Kuiloon Metal Products Co ltd
Priority date: 2022-12-28
Filing date: 2022-12-28
Publication date: 2023-10-24
Anticipated expiration: 2032-12-28

Abstract

The utility model discloses an expansion screw, which comprises a screw rod, an expansion pipe and a nut, wherein the expansion pipe is sleeved outside the screw rod, a plurality of through grooves are formed in the middle of the expansion pipe, a plurality of V-shaped grooves are formed in the top of the expansion pipe, a plurality of first slits are formed in the expansion pipe, the through grooves, the V-shaped grooves and the first slits are in one-to-one correspondence, one end of each first slit is connected with the top of each through groove, and the other end of each first slit is connected with the bottom of each V-shaped groove; the bottom of the screw is provided with a threaded part, and the nut is connected with the threaded part in a matching way; when the expansion screw disclosed by the utility model is installed, the expansion pipe can be effectively unfolded through the matching of the through groove, the slit and the V-shaped groove on the expansion pipe, the contact area between the expansion pipe and the inner wall of the installation hole is increased, the expansion pipe is tightly matched with the inner wall of the installation hole, the friction force between the expansion pipe and the inner wall of the installation hole is increased, and the expansion screw is ensured to be effectively fixed.

Description

Expansion screw

Technical Field

The utility model relates to the technical field of fasteners, in particular to an expansion screw.

Background

The expansion screw is generally made of metal materials, is a screw with strong static fixing force, is commonly used for various decoration occasions in life, such as air conditioners, ceiling lamps, water heaters, range hoods and the like, does not generate vibration objects, and is fixed by utilizing wedge-shaped inclination to promote sleeve expansion to be spread and generate friction holding force with a hole surface to be installed so as to achieve a fixing effect; under the condition of unstable load, if the load has larger vibration, the drilling hole is overlarge in installation or the expansion degree is overlarge, the expansion screw is easy to loosen, and the fastening effect is further affected.

It can be seen that there is a need for improvements and improvements in the art.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, an object of the present utility model is to provide an expansion screw, which can ensure that an expansion pipe is tightly matched with an inner wall of a mounting hole, and reduce the probability of loosening of the expansion screw.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the expansion screw comprises a screw rod, an expansion pipe and a nut, wherein the expansion pipe is sleeved outside the screw rod, a plurality of through grooves are formed in the middle of the expansion pipe, a plurality of V-shaped grooves are formed in the top of the expansion pipe, a plurality of first slits are formed in the expansion pipe, the through grooves, the V-shaped grooves and the first slits are in one-to-one correspondence, one end of each first slit is connected with the top of each through groove, and the other end of each first slit is connected with the bottom of each V-shaped groove; the bottom of the screw rod is provided with a threaded part, and the nut is connected with the threaded part in a matched mode.

In the expansion screw, a plurality of protruding blocks are further arranged on the expansion pipe, and any protruding block is arranged between every two adjacent through grooves.

In the expansion screw, the through groove is a kidney-shaped groove, the lug is a kidney-shaped lug, and the length of the through groove is larger than that of the lug.

In the expansion screw, a second slit is further formed in the expansion pipe, one end of the second slit is connected with the bottom of any through groove, and the other end of the second slit is connected with the bottom of the expansion pipe.

In the expansion screw, a friction part is further arranged at the top of the expansion pipe.

In the expansion screw, the friction part is a plurality of cross slits formed in the top of the expansion pipe.

The expansion screw further comprises a flat gasket and an elastic gasket which are arranged up and down, and the flat gasket and the elastic gasket are positioned between the expansion pipe and the nut.

The beneficial effects are that:

the utility model provides an expansion screw, which can realize the effective expansion of an expansion pipe by matching a through groove, a slit and a V-shaped groove on the expansion pipe when the expansion screw is installed, increase the contact area between the expansion pipe and the inner wall of an installation hole, enable the expansion pipe to be tightly matched with the inner wall of the installation hole, reduce the probability of loosening after the expansion screw is installed, and ensure that the expansion screw is effectively fixed.

Drawings

FIG. 1 is a schematic view of an expansion screw according to the present utility model;

fig. 2 is an exploded view of the expansion screw provided by the present utility model.

Description of main reference numerals: 1-screw, 11-screw thread portion, 2-expansion pipe, 21-through groove, 22-V-shaped groove, 23-first slit, 24-lug, 25-friction portion, 26-second slit, 3-nut, 4-flat gasket, 5-elastic washer.

Detailed Description

The utility model provides an expansion screw, which is further described in detail below with reference to the accompanying drawings and examples in order to make the purpose, technical scheme and effect of the utility model clearer and more definite.

In the description of the present utility model, it should be understood that the azimuth or positional relationship indicated by the terms "top", "bottom", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description of the present utility model and for simplification of description, and are not to be construed as limiting the present utility model; furthermore, the terms "mounted," "connected," and the like, are to be construed broadly and, as appropriate, the specific meaning of the terms in the present utility model will be understood by those of ordinary skill in the art.

Referring to fig. 1 and 2, the utility model provides an expansion screw, which comprises a screw 1, an expansion pipe 2 and a nut 3, wherein the expansion pipe 2 is sleeved outside the screw 1, a plurality of through grooves 21 are formed in the middle of the expansion pipe 2, a plurality of V-shaped grooves 22 are formed in the top of the expansion pipe 2, a plurality of first open seams 23 are formed in the expansion pipe 2, the through grooves 21, the V-shaped grooves 22 and the first open seams 23 are in one-to-one correspondence, one end of the first open seams 23 are connected with the top of the through grooves 21, and the other end of the first open seams 23 are connected with the bottom of the V-shaped grooves 22; the bottom of the screw 1 is provided with a threaded part 11, and the nut 3 is connected with the threaded part 11 in a matching way; in one embodiment, the expansion pipe 2 is provided with 3 through grooves 21, 3V-shaped grooves 22 and 3 first slits 23.

According to the expansion screw disclosed by the utility model, when the expansion screw is installed, the expansion pipe 2 is outwards expanded under the action of wedge-shaped inclination, the expansion pipe 2 can be effectively expanded by matching the through groove 21, the slit and the V-shaped groove 22 on the expansion pipe 2, the contact area between the expansion pipe 2 and the inner wall of the installation hole is increased, the expansion pipe 2 is tightly matched with the inner wall of the installation hole, the probability of loosening problem after the expansion screw is installed is reduced, and the expansion screw is ensured to be effectively fixed; in addition, the through groove 21 can be used for containing dust particles generated by the inner wall of the mounting hole in the mounting process, so that the friction force between the expansion pipe 2 and the inner wall of the mounting hole is increased, and the stability of the expansion screw after being mounted is further improved.

Further, referring to fig. 1 and 2, the expansion pipe 2 is further provided with a plurality of protruding blocks 24, any protruding block 24 is disposed between the adjacent through grooves 21, and the protruding blocks 24 are disposed, so that the middle position of the expansion pipe 2 can be ensured to effectively squeeze the inner wall of the mounting hole, and the connection tightness between the expansion pipe 2 and the inner wall of the mounting hole is further improved, namely the stability of the expansion screw after being mounted is further improved; in one embodiment, 3 protruding blocks 24 are arranged on the expansion pipe 2, and the protruding blocks 24 and the expansion pipe 2 are integrally formed.

Further, referring to fig. 1 and 2, the through groove 21 is a kidney-shaped groove, that is, the area of the through groove 21 is large enough to fully accommodate dust particles on the inner wall of the mounting hole, so as to increase the friction between the expansion pipe 2 and the inner wall of the mounting hole, and facilitate the expansion pipe 2 to be opened; the convex blocks 24 are waist-shaped convex blocks 24, so that the contact area between the middle part of the expansion pipe 2 and the inner wall of the mounting hole can be increased, and the connection compactness between the expansion pipe 2 and the inner wall of the mounting hole can be improved; the length of the through groove 21 is greater than the length of the bump 24.

Further, a second slit 26 is further provided on the expansion pipe 2, one end of the second slit 26 is connected with the bottom of any through groove 21, and the other end of the second slit 26 is connected with the bottom of the expansion pipe 2; the arrangement of the second slit 26 can disperse the extrusion force received by the expansion pipe 2 during installation to a certain extent, avoid the problem of deformation of the expansion pipe 2 due to excessive stress during the installation process, and ensure the normal installation and use of the expansion screw.

Further, referring to fig. 1 and 2, a friction portion 25 is further disposed at the top of the expansion tube 2, so as to further increase the friction between the expansion tube 2 and the inner wall of the mounting hole, i.e. further increase the connection tightness between the expansion tube 2 and the inner wall of the mounting hole; in one embodiment, the friction portion 25 is a plurality of intersecting slits formed in the top of the expansion pipe 2.

Further, referring to fig. 1 and 2, the expansion screw further includes a flat washer 4 and an elastic washer 5 disposed up and down, the flat washer 4 and the elastic washer 5 are located between the expansion pipe 2 and the nut 3, that is, the flat washer 4 is close to the expansion pipe 2, and the elastic washer 5 is close to the nut 3; the flat gasket 4 and the elastic gasket 5 are arranged, so that the nut 3 can be prevented from directly extruding the expansion pipe 2, the extrusion force of the nut 3 to the expansion pipe 2 can be buffered, the problem that the expansion pipe 2 is deformed due to excessive stress is avoided, and the normal installation and use of the expansion screw are ensured.

It will be understood that equivalents and modifications will occur to those skilled in the art based on the present utility model and its spirit, and all such modifications and substitutions are intended to be included within the scope of the present utility model.

Claims

1. The expansion screw is characterized by comprising a screw rod, an expansion pipe and a nut, wherein the expansion pipe is sleeved outside the screw rod, a plurality of through grooves are formed in the middle of the expansion pipe, a plurality of V-shaped grooves are formed in the top of the expansion pipe, a plurality of first slits are formed in the expansion pipe, the through grooves, the V-shaped grooves and the first slits are in one-to-one correspondence, one end of each first slit is connected with the top of each through groove, and the other end of each first slit is connected with the bottom of each V-shaped groove; the bottom of the screw is provided with a threaded part, and the nut is connected with the threaded part in a matching way;

the top of the expansion pipe is also provided with a friction part, and the friction part is a plurality of cross slits formed in the top of the expansion pipe.

2. An expansion screw according to claim 1, wherein the expansion pipe is further provided with a plurality of projections, and any one of the projections is provided between adjacent through grooves.

3. The expansion screw according to claim 2, wherein the through groove is a kidney-shaped groove, the lug is a kidney-shaped lug, and the length of the through groove is greater than the length of the lug.

4. An expansion screw according to claim 1, wherein the expansion pipe is further provided with a second slit, one end of the second slit is connected to the bottom of any one of the through grooves, and the other end of the second slit is connected to the bottom of the expansion pipe.

5. An expansion screw according to claim 1, further comprising flat washers and elastic washers arranged one above the other, said flat washers and elastic washers being located between said expansion tube and said nut.