CN217327989U

CN217327989U - Expansion bolt

Info

Publication number: CN217327989U
Application number: CN202121346813.8U
Authority: CN
Inventors: 吴飞龙
Original assignee: Nanjing Rising Loong Fasteners Co ltd
Current assignee: Nanjing Rising Loong Fasteners Co ltd
Priority date: 2021-06-17
Filing date: 2021-06-17
Publication date: 2022-08-30
Anticipated expiration: 2031-06-17

Abstract

The utility model relates to an expansion bolt, include: a bolt rod, a nut and an expansion sleeve; the expansion sleeve is sleeved on the periphery of the bolt rod; the top of the bolt rod is provided with a thread structure; the nut and the thread structure of the bolt rod form threaded connection; a cone is formed at the bottom of the bolt rod; the bottom of the expansion sleeve is provided with a plurality of separation grooves so as to separate the bottom of the expansion sleeve into a plurality of expansion sheets; the expansion sheet is matched with the cone body, and the cone body is extruded into the bottom of the expansion sleeve so that the expansion sheet can be expanded outwards to form a barb structure; the outer wall surface of the expansion sheet is provided with a grinding layer; the top of the expansion sleeve is provided with a plurality of driving grooves which are used for rotating the expansion sleeve so as to enable the inner wall surface of the grinding layer grinding wall hole to form a taper hole which is attached to the expansion sheet; the number of the separation grooves and the number of the driving grooves are multiple and equal. The utility model discloses an useful part lies in, need not process the bell mouth in advance with the help of extra appurtenance, and the installation is simple.

Description

Expansion bolt

Technical Field

The utility model relates to an expansion bolt.

Background

Expansion bolts generally comprise: a bolt shank, a nut, and an expansion sleeve. The bottom of the bolt rod is provided with a circular truncated cone. The bottom of the expansion casing is provided with a plurality of separation grooves so as to separate the bottom of the expansion casing into a plurality of expansion sheets. The cone is extruded into the bottom of the expansion sleeve so that the expansion pieces can be expanded outwards to form a barb structure.

When the traditional expansion bolt is installed, firstly, a pre-hole needs to be drilled in a wall body, and then a conical hole is machined in the wall of the pre-hole by using a special tool. The expanding sheet is embedded into the conical hole after being expanded to realize the anti-falling function. The installation process is complicated.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an expansion bolts to solve the problem that proposes in the above-mentioned background art.

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

an expansion bolt comprising: a bolt shank, a nut and an expansion sleeve; the expansion sleeve is sleeved on the periphery of the bolt rod; the top of the bolt rod is provided with a thread structure; the nut and the thread structure of the bolt rod form thread connection; a cone is formed at the bottom of the bolt rod; the bottom of the expansion sleeve is provided with a plurality of separation grooves so as to separate the bottom of the expansion sleeve into a plurality of expansion sheets; the expansion sheet is matched with the cone body, and the cone body is extruded into the bottom of the expansion sleeve so that the expansion sheet can be expanded outwards to form a barb structure;

the outer wall surface of the expansion sheet is provided with a grinding layer; the top of the expansion sleeve is provided with a plurality of driving grooves which are used for rotating the expansion sleeve so that the inner wall surface of the grinding layer grinding wall hole forms a conical hole which is attached to the expansion sheet; the number of the separation grooves and the number of the driving grooves are multiple and equal; a plurality of drive slots are evenly distributed around the top of the expansion casing; a plurality of separation grooves are evenly distributed around the bottom of the expansion casing.

As a further aspect of the present invention: the grinding layer is a carborundum grinding layer.

the outer wall surface of the expansion sheet is provided with a grinding layer; the top of the expansion sleeve is provided with a plurality of driving grooves which are used for rotating the expansion sleeve so that the inner wall surface of the grinding layer grinding wall hole forms a taper hole which is jointed with the expansion sheet.

As a further aspect of the present invention: the expansion bolt further comprises: a gasket; the bolt rod penetrates through the gasket; the washer is disposed between the nut and the expansion sleeve.

As a further aspect of the present invention: the width of the driving groove is larger than that of the separation groove.

As a further aspect of the present invention: the driving grooves are uniformly distributed around the top of the expansion casing; a plurality of spaced grooves are evenly distributed around the bottom of the expansion sleeve.

As a further aspect of the present invention: the number of the separation grooves is multiple.

As a further aspect of the present invention: the number of the separation grooves is equal to the number of the driving grooves.

the outer wall surface of the expansion sheet is provided with a grinding layer which grinds the inner wall surface of the wall hole when the expansion sleeve rotates so as to form a conical hole jointed with the expansion sheet.

An installation method of an expansion bolt, comprising the steps of:

the expansion sleeve is rotated while the bolt shank is moved axially relative to the expansion sleeve so that the inner wall surface of the wall hole can be ground by the grinding layer to form a tapered hole which is in close contact with the expansion piece.

Compared with the prior art, the beneficial effects of the utility model are that: the conical hole is not required to be processed in advance by an additional auxiliary tool, and the installation process is simple.

When the expansion sleeve is installed, the expansion sleeve is rotated to enable the inner wall surface of the wall hole to be ground by the grinding layer to form a tapered hole, and the tapered hole is attached to the expansion sheet. Because the tapered hole is formed by processing the grinding layer on the expansion sheet, the tapered hole and the expansion sheet can be tightly matched, and compared with the mode of processing the tapered hole in advance and then installing the expansion bolt, the method has high precision and high reliability.

The traditional installation mode is changed, a tapered hole is machined on the wall of a pre-drilled hole (wall hole) in advance without a special tool, and the installation process is simplified.

Drawings

FIG. 1 is a schematic view of an expansion bolt;

FIG. 2 is an exploded view of one of the expansion bolts of FIG. 1;

FIG. 3 is a cross-sectional view taken at A-A of an expansion bolt of FIG. 1;

fig. 4 is a schematic view of the expansion bolt of fig. 1 installed in a wall.

The expansion bolt comprises an expansion bolt 100, a bolt rod 10, a cone 11, a nut 20, an expansion sleeve 30, a separation groove 31, an expansion sheet 32, a grinding layer 321, a driving groove 33, a gasket 40 and a tapered hole 200.

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.

Referring to fig. 1 to 4, in an embodiment of the present invention, an expansion bolt 100 includes: a bolt shank 10, a nut 20 and an expansion sleeve 30. An expansion sleeve 30 is fitted around the outer periphery of the bolt shank 10. The top of the bolt shank 10 is provided with a threaded structure. The nut 20 is in threaded connection with the thread structure of the bolt shank 10. The bottom of the bolt shank 10 is formed with a circular truncated cone 11. The bottom of the expansion casing 30 is provided with a plurality of separation grooves 31. The dividing groove 31 divides the bottom portion of the expansion sleeve 30 into a plurality of expansion tabs 32. The expansion piece 32 is matched with the cone 11, and the cone 11 is squeezed into the bottom of the expansion sleeve 30 so as to enable the expansion piece 32 to expand outwards to form a barb structure.

The outer wall surface of the expansion piece 32 is provided with a grinding layer 321. The grinding layer 321 grinds the inner wall surface of the wall hole when the expansion sleeve 30 rotates to form the tapered hole 200 in abutment with the expansion tab 32. The top of the expansion sleeve 30 is formed with a plurality of driving grooves 33. The driving groove 33 is used to rotate the expansion sleeve 30 so that the grinding layer 321 grinds the inner wall surface of the wall hole to form the tapered hole 200 in abutment with the expansion tab 32. The width of the driving groove 33 is greater than the width of the separation groove 31.

As a specific embodiment, the grinding layer 321 is a diamond grinding layer 321.

As a specific embodiment, the expansion bolt 100 further includes: a shim 40. The bolt shank 10 passes through the washer 40. A washer 40 is disposed between the nut 20 and the expansion sleeve 30.

As a specific embodiment, a plurality of drive slots 33 are evenly distributed around the top of the expansion casing 30. A number of separate grooves 31 are evenly distributed around the bottom of the expansion sleeve 30. Specifically, the number of the plurality of driving grooves 33, i.e., the driving grooves 33, is 2 or more. The number of the separation grooves 31 and the number of the driving grooves 33 are equal to each other, and the number of the separation grooves 31 and the number of the driving grooves 33 are equal to each other. More specifically, a plurality of drive slots 33 are evenly distributed around the top of the expansion casing 30; a plurality of separation grooves 31 are evenly distributed around the bottom of the expansion sleeve 30. The number of the plurality of driving grooves 33, i.e., the driving grooves 33, is 3 or more than 3. The number of the separation grooves 31 and the number of the drive grooves 33 are each plural, and the number of the separation grooves 31 and the number of the drive grooves 33 are equal. Specifically, the number of the driving grooves 33 is 4.

As a specific embodiment, the expansion sleeve 30 is rotated while the bolt shank 10 is axially moved relative to the expansion sleeve 30 so that the tapered hole 200 can be formed by grinding the inner wall surface of the wall hole with the grinding layer 321. Tapered hole 200 is engaged with expansion tab 32.

Specifically, the cone 11 is squeezed into the bottom of the expansion sleeve 30 so as to expand the expansion piece 32 outwards to form a barb structure, and the expansion sleeve 30 is rotated during the expansion process, so that the grinding layer on the expansion piece 32 grinds the wall hole on the wall to avoid forming the tapered hole 200. The expansion piece 32 is tightly attached to the tapered hole 200, and the installation stability is high.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. An expansion bolt comprising: a bolt shank, a nut and an expansion sleeve; the expansion sleeve is sleeved on the periphery of the bolt rod; the top of the bolt rod is provided with a thread structure; the nut and the thread structure of the bolt rod form a threaded connection; a cone is formed at the bottom of the bolt rod; the bottom of the expansion sleeve is provided with a plurality of separation grooves so as to separate the bottom of the expansion sleeve into a plurality of expansion sheets; the expansion sheet is matched with the cone-shaped body, and the cone-shaped body is extruded into the bottom of the expansion sleeve so that the expansion sheet can be expanded outwards to form a barb structure;

the expansion piece is characterized in that the outer wall surface of the expansion piece is provided with a grinding layer; the top of the expansion sleeve is provided with a plurality of driving grooves which are used for rotating the expansion sleeve to enable the inner wall surface of the grinding layer grinding wall hole to form a conical hole attached to the expansion sheet; the number of the separation grooves and the number of the driving grooves are multiple, and the separation grooves and the driving grooves are equal in number; a plurality of said drive slots are evenly distributed around the top of said expansion casing; a plurality of said separator grooves are evenly distributed around the bottom of said expansion casing.

2. Expansion bolt according to claim 1,

the grinding layer is a carborundum grinding layer.

3. An expansion bolt comprising: a bolt rod, a nut and an expansion sleeve; the expansion sleeve is sleeved on the periphery of the bolt rod; the top of the bolt rod is provided with a thread structure; the nut and the thread structure of the bolt rod form a threaded connection;

a circular table body is formed at the bottom of the bolt rod; the bottom of the expansion sleeve is provided with a plurality of separation grooves so as to separate the bottom of the expansion sleeve into a plurality of expansion sheets; the expansion sheet is matched with the cone-shaped body, and the cone-shaped body is extruded into the bottom of the expansion sleeve so that the expansion sheet can be expanded outwards to form a barb structure;

the expansion piece is characterized in that the outer wall surface of the expansion piece is provided with a grinding layer; and a plurality of driving grooves used for rotating the expansion sleeve to enable the inner wall surface of the grinding layer grinding wall hole to form a conical hole attached to the expansion sheet are formed at the top of the expansion sleeve.

4. Expansion bolt according to claim 3,

the expansion bolt further comprises: a gasket; the bolt shank penetrates through the gasket; the washer is disposed between the nut and the expansion sleeve.

5. Expansion bolt according to claim 3,

the width of the driving groove is larger than that of the separation groove.

6. Expansion bolt according to claim 3,

a plurality of the driving grooves are uniformly distributed around the top of the expansion casing; a plurality of said separator grooves are evenly distributed around the bottom of said expansion casing.

7. Expansion bolt according to claim 3,

the number of the separation grooves is multiple.

8. Expansion bolt according to claim 7,

the number of the separation grooves is equal to the number of the driving grooves.

9. Expansion bolt according to claim 3,

the grinding layer is a carborundum grinding layer.

10. An expansion bolt comprising: a bolt rod, a nut and an expansion sleeve; the expansion sleeve is sleeved on the periphery of the bolt rod; the top of the bolt rod is provided with a thread structure; the nut and the thread structure of the bolt rod form a threaded connection; a cone is formed at the bottom of the bolt rod; the bottom of the expansion sleeve is provided with a plurality of separation grooves so as to separate the bottom of the expansion sleeve into a plurality of expansion sheets; the expansion sheet is matched with the cone-shaped body, and the cone-shaped body is extruded into the bottom of the expansion sleeve so that the expansion sheet can be expanded outwards to form a barb structure;

the expansion sleeve is characterized in that the outer wall surface of the expansion sheet is provided with a grinding layer which is used for grinding the inner wall surface of the wall hole when the expansion sleeve rotates so as to form a conical hole attached to the expansion sheet.