CN215950071U

CN215950071U - Expansion screw

Info

Publication number: CN215950071U
Application number: CN202122416392.8U
Authority: CN
Inventors: 杨创通
Original assignee: Guizhou Chuangtong Chenghao Trading Co ltd
Current assignee: Guizhou Chuangtong Chenghao Trading Co ltd
Priority date: 2021-10-08
Filing date: 2021-10-08
Publication date: 2022-03-04
Anticipated expiration: 2031-10-08

Abstract

The utility model discloses an expansion screw which comprises an expansion sleeve, a flat washer, a screw rod and a nut, wherein one end of the expansion sleeve is an expansion end, the other end of the expansion sleeve is a fixed end, the screw rod axially penetrates through the expansion sleeve, the nut is screwed at the threaded end of the screw rod, the flat washer is sleeved on the screw rod and is positioned between the expansion sleeve and the nut, and a plurality of outer inverted cone bulges facing the flat washer are uniformly arranged on the outer annular wall of the fixed end of the expansion sleeve upwards; when the expansion screw is installed, the screw rod can be driven by the rotary nut to rotate outwards to the drill hole until the tapered end of the screw rod pushes the expansion end to radially expand outwards so as to be attached to the hole wall. This inflation screw sets up outer back taper arch and can make the expanded casing's stiff end adapt to the drilling that the aperture is big partially, has reduced the requirement to drilling aperture error, enlarges inflation screw's use scene.

Description

Expansion screw

Technical Field

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

Background

The expansion screw utilizes the wedge-shaped slope to promote expansion to generate friction gripping force, thereby achieving the fixing effect. The expansion screw used at present generally comprises a nut, a screw rod and an expansion sleeve, wherein one end of the screw rod is provided with threads, the other end of the screw rod is provided with conicity, one end of the expansion sleeve is axially grooved, and the screw rod expands the expansion sleeve along with the screwing of the nut so as to achieve the fastening effect.

The existing expansion screw has the defects that 1, the requirement on the hole diameter of a drilled hole is strict, namely, the drilled hole cannot be too large and too deep, otherwise, the fixed effect cannot be realized, the expansion screw is easy to fall off, 2, the contact area of an expansion end and the inner wall of the drilled hole is small, the friction gripping force is limited, the fixing effect of the expansion screw is limited, and the use scene is limited.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an expansion screw, so that the fixing strength of the expansion screw is increased, the requirement on the aperture of a drilled hole is reduced, and the use scene is enlarged.

In order to achieve the purpose, the expansion screw provided by the utility model comprises an expansion sleeve, a flat washer, a screw rod and a nut, wherein one end of the expansion sleeve is an expansion end, the other end of the expansion sleeve is a fixed end, the screw rod axially penetrates through the expansion sleeve, the nut is screwed at the threaded end of the screw rod, the flat washer is sleeved on the screw rod and is positioned between the expansion sleeve and the nut, and a plurality of outer inverted cone bulges facing the flat washer are uniformly arranged upwards on an outer annular wall ring of the fixed end of the expansion sleeve; when the expansion screw is installed, the screw rod can be driven by the rotary nut to rotate outwards to the drill hole until the tapered end of the screw rod pushes the expansion end to radially expand outwards so as to be attached to the hole wall.

When the expansion screw is used, firstly, a hole is drilled in a wall body or other objects, the expansion end of the expansion sleeve and the taper end of the screw rod are arranged in the hole, then the nut is rotated outwards, the taper end of the screw rod moves outwards the hole to prop open the expansion end of the expansion sleeve along with the continuous tightening of the nut, so that the expansion end of the expansion sleeve is tightly attached to the hole wall of the hole expanding part of the hole, the fastening purpose is achieved, the fixed end of the expansion sleeve can adapt to the hole with larger hole diameter by arranging the outer inverted cone protrusion, the requirement on the hole diameter error of the hole is reduced, and the use scene of the expansion screw is expanded.

In the above technical solution, the present invention may further be modified as follows:

preferably, the expansion end is formed by uniformly arranging a plurality of axial grooves on the annular surface of one end of the expansion sleeve far away from the flat gasket in a separated mode.

Preferably, the expansion sleeve is provided with a plurality of diameter expansion grooves corresponding to the axial grooves one to one, one end of each diameter expansion groove is connected with the axial groove, and the other end of each diameter expansion groove is a closed end.

Preferably, the outer wall of the expansion end is provided with a plurality of adherent friction bulges.

Preferably, the expansion sleeve comprises an expansion outer pipe and an expansion inner pipe which is positioned inside the expansion outer pipe and is coaxial with the expansion outer pipe, wherein both ends of the expansion inner pipe and the expansion outer pipe, which are far away from the flat gasket, are expansion ends, and when the expansion ends of the expansion outer pipe and the expansion inner pipe are completely unfolded, the expansion ends of the expansion outer pipe and the expansion inner pipe enclose an annular structure.

Preferably, the inner wall of the expansion inner pipe is annularly and upwards provided with a plurality of inner inverted cone bulges deviating from the flat gasket, and the inner inverted cone bulges are abutted against the outer wall of the screw rod.

Preferably, the length of the expansion inner tube is shorter than the length of the expansion outer tube, and the expansion inner tube and the expansion outer tube are flush with the mating end of the flat washer.

Preferably, the screw rod further comprises a spring washer, wherein the spring washer is arranged between the flat washer and the nut and sleeved outside the screw rod.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

In order to more clearly illustrate the detailed description of the utility model or the technical solutions in the prior art, the drawings that are needed in the detailed description of the utility model or the prior art will be briefly described below.

FIG. 1 is a schematic structural diagram of an expansion screw according to an embodiment of the present invention;

FIG. 2 is a schematic view of an internal structure of an expansion screw according to an embodiment of the present invention;

FIG. 3 is a schematic view of the direction A-A in FIG. 1;

FIG. 4 is a schematic representation of the expanded end of the outer inflation tube and the expanded end of the inner inflation tube of FIG. 3 after deployment;

in the drawing, the expansion outer tube 11, the outer inverted cone protrusion 111, the axial groove 112, the diameter expanding groove 113, the adherence friction protrusion 113, the axial groove 112, the expansion inner tube 12, the inner inverted cone protrusion 121, the flat washer 2, the screw 3, the nut 4 and the spring washer 5.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

Referring to fig. 1 to 4, the present embodiment discloses an expansion screw, which includes an expansion sleeve, a flat washer 2, a screw rod 3 and a nut 4.

As shown in fig. 1, one end of the expansion sleeve is an expansion end, the other end is a fixed end, the screw rod 3 axially penetrates through the expansion sleeve, a nut 4 is screwed on the threaded end of the screw rod 3, the flat washer 2 is sleeved outside the screw rod 3 and is located between the expansion sleeve and the nut 4, and a plurality of outer inverted cone protrusions 111 facing the flat washer 2 are uniformly arranged on the outer annular wall of the fixed end of the expansion sleeve upwards; when the expansion screw is installed, the rotary nut 4 can drive the screw rod 3 to rotate outwards towards the drill hole until the tapered end of the screw rod 3 pushes the expansion end to radially expand outwards so as to be attached to the hole wall.

Based on the above, when the expansion screw is used, firstly, a hole is drilled in a wall body or other objects, the expansion end of the expansion sleeve and the taper end of the screw rod 3 are arranged in the hole, then the nut 4 is rotated outwards, the taper end of the screw rod 3 moves outwards the hole to prop open the expansion end of the expansion sleeve along with the continuous tightening of the nut 4, so that the expansion end of the expansion sleeve is tightly attached to the hole wall of the hole expanding part of the hole, the fastening purpose is achieved, the fixed end of the expansion sleeve can adapt to the hole with larger hole diameter by arranging the outer inverted cone protrusion 111, the requirement on the hole diameter error of the hole is reduced, and the use scene of the expansion screw is expanded.

As shown in fig. 1, the expansion end is formed by uniformly forming a plurality of axial grooves 112 on the annular surface of one end of the expansion sleeve far away from the flat gasket 2 in a separated manner, the number of the axial grooves 112 is between 3 and 6, a plurality of diameter-expanding grooves 113 corresponding to the axial grooves 112 in a one-to-one manner are formed on the expansion sleeve, one end of each diameter-expanding groove 113 is connected with the axial groove 112, the other end of each diameter-expanding groove is a closed end, and the diameter-expanding grooves 113 are formed to enable the expansion end to be expanded to a larger angle, so that the gripping force of the expansion screw is increased.

In this embodiment, the outer wall of inflation end is equipped with a plurality of adherence friction protrusion 113, and adherence friction protrusion 113 becomes sheet structure, sets up adherence friction protrusion 113 and helps increasing the frictional force between inflation end and the pore wall, and then increases the bond stress of inflation screw.

As shown in fig. 2 to 4, the expansion sleeve includes an expansion outer tube 11 and an expansion inner tube 12 located inside the expansion outer tube 11 and coaxial with the expansion outer tube 11, both ends of the expansion inner tube 12 and the expansion outer tube 11 far from the flat washer 2 are expansion ends, when the expansion ends of the expansion outer tube 11 and the expansion end of the expansion inner tube 12 are completely expanded, the expansion end of the expansion outer tube 11 and the expansion end of the expansion inner tube 12 enclose an annular structure, by adding the expansion inner tube 12, the tapered end of the screw 3 can be pressed against the expansion end of the expansion outer tube 11 and the expansion end of the expansion inner tube 12 against the hole wall of the hole expanding portion, the friction area between the tapered end and the hole wall of the hole expanding portion is increased, so that the friction between the expansion end and the hole wall of the hole expanding portion is increased, and the holding force of the expansion screw is increased.

In this embodiment, the inner wall of the inner expansion pipe 12 is provided with a plurality of inner inverted cone protrusions 121 upwardly away from the flat gasket 2, and the tapered end of the screw rod 3 pushes the inner inverted cone protrusions 121 to rapidly expand the expansion end of the outer expansion pipe 11.

In this embodiment, the length of the inner expansion tube 12 is shorter than the length of the outer expansion tube 11, and the inner expansion tube 12 and the outer expansion tube 11 are flush with the mating end of the flat washer 2, so that the inner expansion tube 12 pushes the outer expansion tube 11 before deployment.

In this embodiment, a spring washer 5 is further included, the spring washer 5 is disposed between the flat washer 2 and the nut 4 and is externally sleeved on the screw rod 3, and the spring washer 5 is disposed to prevent the screw rod 3 from excessively moving outwards.

In summary, the expansion screw provided in this embodiment can adapt to a drill hole with a larger aperture by adding the outer inverted cone protrusion 111, so as to reduce the requirement for the aperture error of the drill hole; and through setting up inflation inner tube 12 and interior back taper protruding 121, the area of contact in multiplicable screw rod 3 tapering end and drilling aperture, and then increase the grip of inflation screw for the inflation screw use scene is wider.

Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the utility model as defined in the appended claims. The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.

Claims

1. An expansion screw comprises an expansion sleeve, a flat washer (2), a screw rod (3) and a nut (4), and is characterized in that one end of the expansion sleeve is an expansion end, the other end of the expansion sleeve is a fixed end, the screw rod (3) axially penetrates through the expansion sleeve, the nut (4) is screwed at the threaded end of the screw rod (3), the flat washer (2) is sleeved on the screw rod (3) and is positioned between the expansion sleeve and the nut (4), and a plurality of outer inverted cone bulges (111) facing the flat washer (2) are uniformly arranged on the outer annular wall of the fixed end of the expansion sleeve in an upward direction; when the expansion screw is installed, the rotary nut (4) can drive the screw rod (3) to rotate outwards of the drilled hole, so that the tapered end of the screw rod (3) pushes the expansion end to expand outwards in the radial direction to be attached to the hole wall of the drilled hole.

2. Expansion screw according to claim 1, characterised in that the expansion end is obtained by a plurality of axial grooves (112) uniformly spaced around the circumference of the expansion sleeve at the end remote from the flat washer (2).

3. The expansion screw as claimed in claim 2, wherein the expansion sleeve is provided with a plurality of diameter-expanding grooves (113) corresponding to the axial grooves (112), one end of each diameter-expanding groove (113) is connected with the axial groove (112), and the other end of each diameter-expanding groove is a closed end.

4. Expansion screw according to claim 3, characterized in that the outer wall of the expansion end is provided with a plurality of adherent friction protrusions (114).

5. The expansion screw according to claim 1, characterized in that the expansion sleeve comprises an expansion outer tube (11) and an expansion inner tube (12) which is positioned inside the expansion outer tube (11) and is coaxial with the expansion outer tube (11), the ends of the expansion inner tube (12) and the expansion outer tube (11) far away from the flat washer (2) are expansion ends, and when the expansion ends of the expansion outer tube (11) and the expansion inner tube (12) are completely unfolded, the expansion ends of the expansion outer tube (11) and the expansion end of the expansion inner tube (12) enclose an annular structure.

6. Expansion screw according to claim 5, characterized in that the inner wall of the inner expansion tube (12) is provided with a plurality of inner inverted cone-shaped protrusions (121) which are away from the flat washer (2) and are arranged annularly upwards, and the inner inverted cone-shaped protrusions (121) are abutted against the outer wall of the screw rod (3).

7. Expansion screw according to claim 6, characterized in that the length of the expansion inner tube (12) is shorter than the length of the expansion outer tube (11) and the end surface of the fixed end of the expansion inner tube (12) is flush with the end surface of the fixed end of the expansion outer tube (11).

8. Expansion screw according to claim 1, further comprising a spring washer (5), wherein the spring washer (5) is placed between the flat washer (2) and the nut (4) and is externally sleeved on the screw (3).