CN219673037U - Expansion screw - Google Patents

Abstract

The utility model relates to an expansion screw, which comprises a sleeve and an expansion pipe, wherein a plurality of fins are arranged on an annular array at the upper part of the expansion pipe, the sleeve is positioned above the expansion pipe, the outer wall at the lower part of the sleeve is abutted against the inner wall at the upper part of the fins, a stud is inserted in the sleeve in a penetrating and sliding manner, the top end of the stud extends to the upper part of the sleeve and is fixedly connected with an end cap, a placing groove is formed in the bottom end of the expansion pipe, a nut matched with the stud is arranged in the placing groove in a sliding manner, the bottom end of the stud penetrates through the expansion pipe and extends to the lower part of the expansion pipe after passing through the nut, and the upper part of one side of the fin close to the sleeve and the outer wall at the lower part of the sleeve are arc-shaped.

Description

Expansion screw

Technical Field

The utility model relates to an expansion screw, and belongs to the technical field of expansion screws.

Background

The expansion screw is generally a metal expansion screw, the expansion screw is fixed by utilizing wedge-shaped inclination to promote expansion to generate friction grip force so as to achieve the fixing effect, one end of the screw is threaded, one end of the screw is tapered, an iron sheet (some steel pipes) is covered outside, one half of an iron sheet cylinder (steel pipes) is provided with a plurality of notches, the iron sheet cylinder (steel pipes) are plugged into holes formed in a wall together, then nuts are locked, the nuts pull the screw outwards, the taper is pulled into the iron sheet cylinder, the iron sheet cylinder is expanded and then tightly fixed on the wall, and the iron sheet cylinder is generally used for fastening guard rails, awning, air conditioners and the like on materials such as cement, bricks and the like, but the fixing is not very reliable, and if the load has large vibration, the iron sheet cylinder (steel pipes) can be loosened, so the iron sheet cylinder is not recommended for installing ceiling fans and the like.

When the common expansion screw is used, the expansion screw is required to be inserted into a preset drilling hole, then the tool is used for rotating the nut on the expansion screw, and the nut rotates on the screw rod of the expansion screw, so that the cylinder is expanded or the fin bends and abuts against the hole wall, and the expansion screw is mainly fixed by the friction force between the fin and the wall at the moment and can fall off under the condition of high tension.

Disclosure of Invention

The utility model aims to provide an expansion screw, and by changing the bending direction of a fin, the stability of the expansion screw in use can be effectively improved, so that the safety of the expansion screw in use is effectively improved, the practicability of the expansion screw is improved, and the problems in the background art are solved.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the expansion screw comprises a sleeve and an expansion pipe, wherein a plurality of fins are arranged on an annular array on the upper portion of the expansion pipe, the sleeve is located above the expansion pipe, the outer wall of the lower portion of the sleeve is in conflict with the inner wall on the upper portion of the fins, a stud is inserted in the sleeve in a penetrating and sliding manner, the top end of the stud extends to the upper portion of the sleeve and is fixedly connected with an end cap, a placing groove is formed in the bottom end of the expansion pipe, a nut matched with the stud is arranged in the placing groove in a sliding manner, and the bottom end of the stud penetrates through the expansion pipe and extends to the lower portion of the expansion pipe after passing through the nut.

Furthermore, the upper part of one side of the fin, which is close to the sleeve, and the outer wall of the lower part of the sleeve are arc-shaped, and the fin, the sleeve and the expansion pipe are all the same in material.

Further, the top end of the sleeve is provided with a limiting ring, the top end of the limiting ring is abutted against the bottom end of the end cap, a through hole matched with the stud is formed in the limiting ring in a penetrating mode, the diameter of the end cap is larger than that of the sleeve, and the diameter of the limiting ring is larger than that of the end cap.

Further, the bottom end of the limiting ring is fixedly connected with the top end of the sleeve through welding.

Further, the cross section of the placing groove is of a polygonal structure.

Further, a plurality of pressing sheets are fixedly arranged at the bottom end annular array of the expansion pipe, and the other ends of the pressing sheets are abutted to the bottom ends of the nuts.

Furthermore, the pressing sheets are made of metal materials, and the number of the pressing sheets is 3-6.

The beneficial effects of the utility model are as follows:

according to the utility model, the sleeve and the nut are arranged, when the expansion screw is used, the device is placed in a pre-reserved drilling hole, then the tool is used for rotating the end cap, so that the end cap drives the stud to rotate, at the moment, the stud rotates in the nut, the nut drives the expansion pipe to move towards the sleeve direction, at the moment, the fin bends under the action of the sleeve, so that the top end of the fin is abutted against the inner wall of the drilling hole, when the expansion screw is pulled by external force, the top end of the fin is inserted into the inner wall of the drilling hole, the fin bites the inner wall of the drilling hole, and the tension can be increased, the expansion screw is pulled more tightly, the stability of the expansion screw in use can be effectively improved, and by arranging the limiting ring, the end cap can be prevented from entering the pre-set hole, the normal use of the device is further influenced, at the moment, the limiting ring can play a limiting role on the sleeve end cap and the gasket, and at the same time, the limiting ring can play a role of a gasket, and after the nut is placed in the placing groove by arranging the pressing piece, the tool is used, so that the fin bends and the fin is abutted against the inner wall of the drilling hole, the nut can be screwed into the inner wall of the drilling hole, the nut by using the tool, the nut can be effectively bent, and the stability of the nut can be improved, and the stability can be improved when the nut is effectively screwed into the nut.

Drawings

The accompanying drawings are included to provide a further understanding of the utility model, and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the description serve to explain the utility model.

FIG. 1 is a front view of an expansion screw of the present utility model;

FIG. 2 is a schematic view of the structure of the expansion screw of the present utility model;

FIG. 3 is a schematic perspective view of an expansion tube and fin of the expansion screw of the present utility model;

FIG. 4 is a bottom view of the expansion tube of the expansion screw of the present utility model;

reference numerals in the drawings: 1. a sleeve; 2. an expansion tube; 3. a fin; 4. a stud; 5. an end cap; 6. a placement groove; 7. a nut; 8. a limiting ring; 9. tabletting.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-4, the present utility model provides a technical solution:

the expansion screw comprises a sleeve 1 and an expansion pipe 2, wherein a plurality of fins 3 are arranged on an annular array on the upper portion of the expansion pipe 2, the sleeve 1 is located above the expansion pipe 2, the outer wall of the lower portion of the sleeve 1 is abutted against the inner wall on the upper portion of the fins 3, a stud 4 is inserted in the sleeve 1 in a penetrating and sliding manner, the top end of the stud 4 extends to the upper portion of the sleeve 1 and is fixedly connected with an end cap 5, a placing groove 6 is formed in the bottom end of the expansion pipe 2, nuts 7 matched with the stud 4 are arranged in the placing groove 6 in a sliding manner, and the bottom end of the stud 4 penetrates through the expansion pipe 2 and passes through the nuts 7 to extend to the lower portion of the expansion pipe 2.

Specifically, as shown in fig. 1-3, the upper portion of one side of the fin 3, which is close to the sleeve 1, and the outer wall of the lower portion of the sleeve 1 are arc-shaped, and the fin 3, the sleeve 1 and the expansion pipe 2 are all made of the same material, and arc-shaped structures are arranged on the upper portion of the fin 3 and the lower portion of the sleeve 1, so that the contact area between the fin 3 and the sleeve 1 can be reduced, the friction force between the fin 3 and the sleeve 1 can be reduced, and the fin 3 is bent through the sleeve 1 conveniently.

Specifically, as shown in fig. 1 and fig. 2, the top of sleeve 1 is equipped with spacing ring 8, the top of spacing ring 8 with the bottom of end cap 5 is contradicted, run through on the spacing ring 8 set up with double-screw bolt 4 assorted through-hole, the diameter of end cap 5 is greater than the diameter of sleeve 1, the diameter of spacing ring 8 is greater than the diameter of end cap 5, the cross section of standing groove 6 is polygonal structure, through setting up spacing ring 8 to in can avoiding end cap 5 to get into the hole of predetermineeing, and then influence the normal use of device, spacing ring 8 can play spacing effect to sleeve 1 and end cap 5 this moment, and spacing ring 8 also can play the effect of gasket simultaneously.

Specifically, as shown in fig. 1-3, the bottom annular array of the expansion pipe 2 is fixedly provided with a plurality of pressing sheets 9, the other ends of the pressing sheets 9 are all in contact with the bottom end of the nut 7, the pressing sheets 9 are made of metal materials, the number of the pressing sheets 9 is 3-6, after the nut 7 is placed in the placing groove 6 through the pressing sheets 9, a user bends the pressing sheets 9 by using a tool at the moment, so that the pressing sheets 9 are in contact with the nut 7, the nut 7 can be fixed in the placing groove 6, and the screw bolt 4 is conveniently screwed into the nut 7.

Referring to fig. 2 and fig. 4, the cross section of the placement groove 6 is of a polygonal structure, and by setting the placement groove 6 to be of a polygonal structure, the stability of the nut 7 in the placement groove 6 can be improved, and further the rotation of the nut 7 in the placement groove 6 during the rotation of the stud 4 can be avoided, so that the stability of the nut 7 in the placement groove 6 can be improved.

The working principle of the utility model is as follows: after placing the nut 7 in the placing groove 6, at this time, a user bends the pressing sheet 9 by using a tool, so that the pressing sheet 9 can be abutted against the nut 7, and then the nut 7 can be fixed in the placing groove 6, so that the stud 4 is conveniently screwed into the nut 7, then the device is placed in a pre-reserved drilling hole, then the tool is used for rotating the end cap 5, so that the end cap 5 drives the stud 4 to rotate, at this time, the stud 4 rotates in the nut 7, so that the nut 7 drives the expansion pipe 2 to move towards the sleeve 1, at this time, the fin 3 bends under the action of the sleeve 1, so that the top end of the fin 3 is abutted against the inner wall of the drilling hole, at this time, when the expansion screw is pulled by external force, the top end of the fin 3 is inserted into the inner wall of the drilling hole, and the inner wall of the drilling hole is snapped by using the fin 3, so that the pulling force can be increased, the expansion screw is pulled more tightly, the stability of the expansion screw in use can be effectively improved, the end cap 5 can be prevented from entering a preset hole by arranging the limiting ring 8, the normal use of the device is further affected, the limiting ring 8 can play a limiting role on the sleeve 1 and the end cap 5, meanwhile, the limiting ring 8 can play a role of a gasket, the contact area between the fin 3 and the sleeve 1 can be reduced by arranging the arc-shaped structure on the upper part of the fin 3 and the lower part of the sleeve 1, the friction force between the fin 3 and the sleeve 1 can be reduced, the fin 3 can be bent conveniently through the sleeve 1, the stability of the nut 7 in the placing groove 6 can be improved by arranging the placing groove 6 into a polygonal structure, the nut 7 can be prevented from rotating in the placing groove 6 in the rotating process of the stud 4, so that the stability of the nut 7 when it is positioned in the placement groove 6 can be improved.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model 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 disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims (7)

1. The expansion screw comprises a sleeve (1) and an expansion pipe (2), and is characterized in that: the upper annular array of expansion pipe (2) is equipped with a plurality of fin (3), sleeve pipe (1) is located the top of expansion pipe (2), the lower part outer wall of sleeve pipe (1) with the upper portion inner wall of fin (3) is contradicted, run through in sleeve pipe (1) and slide and insert and be equipped with double-screw bolt (4), extend to top and fixedly connected with end cap (5) of sleeve pipe (1) on double-screw bolt (4), standing groove (6) have been seted up to the bottom of expansion pipe (2), be equipped with in standing groove (6) in the slip with double-screw bolt (4) assorted nut (7), the bottom of double-screw bolt (4) runs through expansion pipe (2) and pass through behind nut (7) extend to the below of expansion pipe (2).

2. The expansion screw of claim 1, wherein: the fin (3) is close to one side upper portion of the sleeve (1) and the outer wall of the lower portion of the sleeve (1) are arc-shaped, and materials of the fin (3), the sleeve (1) and the expansion pipe (2) are the same.

3. The expansion screw of claim 1, wherein: the top of sleeve pipe (1) is equipped with spacing ring (8), the top of spacing ring (8) with the bottom of end cap (5) is contradicted, run through on spacing ring (8) set up with double-screw bolt (4) assorted through-hole, the diameter of end cap (5) is greater than the diameter of sleeve pipe (1), the diameter of spacing ring (8) is greater than the diameter of end cap (5).

4. An expansion screw according to claim 3, wherein: the bottom end of the limiting ring (8) is fixedly connected with the top end of the sleeve (1) through welding.

5. The expansion screw of claim 1, wherein: the cross section of the placing groove (6) is of a polygonal structure.

6. The expansion screw of claim 1, wherein: the bottom annular array of expansion pipe (2) is fixed and is equipped with a plurality of preforming (9), the other end of preforming (9) all with the bottom of nut (7) is contradicted.

7. The expansion screw of claim 6, wherein: the pressing pieces (9) are made of metal materials, and the number of the pressing pieces (9) is 3-6.