CN211778400U - Novel expansion bolt - Google Patents

Abstract

The utility model discloses a new type of expansion bolt, which comprises a hexagonal bolt, an expansion pipe and a special-shaped nut. The hexagonal bolt is provided with a cylindrical part and a threaded part; the expansion pipe is provided with a circular pipe part and an expansion part; The outer diameter of the threaded portion is matched with the inner diameter of the circular pipe portion, and the threaded portion is threadedly connected to the special-shaped nut through the expansion portion. The special-shaped nut is provided with a conical truncated portion and a circular truncated portion. The outer diameter of the expansion part is larger than the inner diameter of the expansion part in the free state, the outer diameter of the circular truncated part matches the inner diameter of the expansion part in the free state, the outer circumference of the expansion part is provided with a slotted guide groove, the The outer circumference of the circular truncated portion is provided with a guide block matched with the slotted guide groove. The utility model has the advantages of simple structure, convenient use and dismantling, anti-skid and repeated use.

Description

A new type of expansion bolt

technical field

The utility model relates to a threaded connecting piece, in particular to a novel expansion bolt.

Background technique

To screw a screw on a brick wall or concrete wall, you need to use an electric drill to make a suitable size hole in the wall, then insert the bolt and tighten the nut. Therefore, in the actual operation process, it is often encountered that the punched holes are not suitable. It needs to drill multiple times or need something to cushion the bolts. The operation is cumbersome and time-consuming, and sometimes there are insufficient bolt strength and low service life. Happening. In order to ensure the strength of use, more expansion bolts are currently used. The expansion bolts currently used generally include a screw, a nut and an expansion sleeve. When in use, the front end of the expansion sleeve is expanded by screwing in the screw, so that the bolt is stuck on the wall of the wall. in the hole. Although the expansion bolts can ensure the subsequent use strength, the existing expansion bolts are difficult to remove after installation and difficult to be used repeatedly. Once installed, they are difficult to remove from the wall and can only be used as disposable consumables. Moreover, the expansion bolts exposed on the outside of the wall will also affect the aesthetics and hinder the change of safety. In addition, since the diameter of the existing expansion bolt is fixed, when the installation hole is too large, the expansion sleeve is easily driven and slipped during the process of tightening the nut, which cannot meet the installation requirements.

Utility model content

The technical problem to be solved by the utility model is to provide a new type of expansion bolt with simple structure, convenient operation, anti-skid and reusability.

In order to solve the above technical problems, the utility model provides a new type of expansion bolt, which includes a hexagonal bolt, an expansion pipe and a special-shaped nut, the hexagonal bolt is provided with a cylindrical part and a threaded part, and the expansion pipe is provided with a circular pipe part and a special-shaped nut. The expansion part, the outer diameter of the cylindrical part is matched with the inner diameter of the circular pipe part, the threaded part passes through the expansion part and is threadedly connected with the special-shaped nut, and the special-shaped nut is provided with a conical truncated part and a circular truncated part. , the outer diameter of the truncated cone part is larger than the inner diameter of the expansion part in the free state, the outer diameter of the truncated cone part is matched with the inner diameter of the expansion part in the free state, and the outer circumference of the expansion part is provided with an opening A slot guide groove is provided, and a guide block matched with the slot guide slot is arranged on the outer circumference of the circular truncated portion.

As a preferred solution of the present invention, the end of the threaded portion is provided with an axial limiter for preventing the special-shaped nut from being separated from the threaded portion.

As a preferred solution of the present invention, the axial limiting member is a split pin, and the end of the threaded portion is provided with a pin hole connected with the split pin.

As a preferred solution of the present invention, the cross-section of the slotted guide groove is T-shaped, and the cross-section of the guide block is T-shaped.

As a preferred solution of the present invention, the expansion pipe is provided with a hexagonal head.

Compared with the prior art, a new type of expansion bolt provided by the utility model has the following beneficial effects:

When in use, insert the entire expansion bolt into the installation hole. When the expansion pipe is matched with the installation hole, the expansion pipe is relatively fixed, and then the hexagonal bolt is rotated to make the special-shaped nut expand under the constraint of the slotted guide groove and the guide block. The inside of the tube moves. As the hexagonal bolts are gradually screwed in, the conical truncated part of the special-shaped nut expands the expansion part of the expansion tube, so that the bolts are stuck in the installation holes; when the installation holes are too large, the hexagonal bolts can be rotated in advance to expand the expansion pipe. The expansion part of the pipe expands to the extent that it fits with the installation hole, and then inserts it into the installation hole for tightening and fixing, so as to prevent the expansion pipe from being easily driven and slipping during the process of tightening the hexagonal bolts, and the use is flexible to meet the installation requirements; When expanding the bolts, the hexagonal bolts can be loosened by reverse rotation, so as to avoid damage to the area near the installation hole (such as the wall) during the removal process, and the guide block can pull the slit to guide the special-shaped nut during the movement of the expansion pipe. The groove shrinks the expansion part to the original state, so as to avoid the expansion tube from being unable to reset after being expanded and affecting the next use. It can be seen that the expansion bolt of the present invention has the advantages of simple structure, convenient use and dismantling, anti-slip, and can be reused.

Description of drawings

1 is a schematic structural diagram of a new type of expansion bolt provided by an embodiment of the present invention;

2 is an exploded view of a new type of expansion bolt provided by an embodiment of the present invention;

3 is a cross-sectional view of a new type of expansion bolt provided by an embodiment of the present invention;

In the figure, 1, hexagonal bolt; 11, cylindrical part; 12, threaded part; 2, expansion pipe; 21, round pipe part; 22, expansion part; 23, slotted guide groove; 3, special-shaped nut; 31, truncated cone part; 32, circular truncated part; 33, guide block; 4, axial limiter.

Detailed ways

The specific embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "horizontal", "top", "bottom", "front", "rear" and "left" are used in the present invention , "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, only for the purpose of It is for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first", "second", and "third" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

As shown in FIGS. 1 to 3 , a preferred embodiment of a new type of expansion bolt according to the preferred embodiment of the present invention includes a hexagonal bolt 1 , an expansion tube 2 and a special-shaped nut 3 , and the hexagonal bolt 1 is provided with a cylindrical The expansion pipe 2 is provided with a circular pipe part 21 and an expansion part 22, the outer diameter of the cylindrical part 11 is matched with the inner diameter of the circular pipe part 21, and the threaded part 12 passes through the The expansion part 22 is threadedly connected with the special-shaped nut 3, and the special-shaped nut 3 is provided with a truncated cone part 31 and a circular truncated part 32, and the outer diameter of the truncated cone part 31 is larger than the inner diameter of the expansion part 22 in a free state , the outer diameter of the truncated portion 32 is matched with the inner diameter of the expansion portion 22 in a free state, the outer circumference of the expansion portion 22 is provided with a slotted guide groove 23, and the outer circumference of the circular truncated portion 32 is provided with the The guide block 33 matched with the slotted guide groove 23 . When in use, insert the entire expansion bolt into the installation hole, when the expansion pipe 2 is matched with the installation hole, the expansion pipe 2 is relatively fixed, and then rotate the hexagonal bolt 1, so that the special-shaped nut 3 is in the slotted guide groove 23 and the guide block. Under the constraint of 33, it moves to the inside of the expansion pipe 2, and as the hexagonal bolt 1 is gradually screwed in, the conical frustum 31 of the special-shaped nut 3 expands the expansion part 22 of the expansion pipe 2, so that the bolt is stuck in the installation hole; When the hole is too large, you can pre-rotate the hexagonal bolt 1 to expand the expansion part 22 of the expansion pipe 2 to the extent that it fits with the installation hole, and then insert it into the installation hole for tightening and fixing, so as to prevent the expansion pipe during the process of tightening the hexagonal bolt 1. 2 It is easy to be driven and slipped, and it is flexible to use and meets the installation requirements; when the expansion bolt needs to be removed, the hexagonal bolt 1 can be loosened by reverse rotation, so as to avoid damage to the area near the installation hole (such as the wall) during the removal process, and the special-shaped During the movement of the nut 3 out of the expansion tube 2, the guide block 33 can pull the slotted guide groove 23 to shrink the expansion part 22 to the original state, so as to prevent the expansion tube 2 from being unable to reset after being expanded and affecting the next use. It can be seen that the expansion bolt of the present invention has the advantages of simple structure, convenient use and dismantling, anti-slip, and can be reused.

Exemplarily, the end of the threaded portion 12 is provided with an axial limiting member 4 for preventing the special-shaped nut 3 from being separated from the threaded portion 12 . Specifically, the axial limiting member 4 is a split pin, and the end of the threaded portion 12 is provided with a pin hole connected with the split pin.

Exemplarily, the cross-section of the slotted guide groove 23 is T-shaped, and the cross-section of the guide block 33 is T-shaped. Specifically, three slotted guide grooves 23 are evenly arranged along the circumferential direction of the expansion portion 22 , and the slotted guide slots 23 are parallel to the axis of the expansion tube 2 .

Exemplarily, the expansion tube 2 is provided with a hexagonal head, which is an integrally formed structure to facilitate the use of a wrench to fix the expansion tube to ensure smooth subsequent operations, and at the same time, it also replaces the arrangement of gaskets, reducing parts and facilitating operations.

In the description of the present invention, it should be understood that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" in the present invention should be understood in a broad sense, for example, it may be a fixed connection It can also be a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or the internal communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, some improvements and replacements can be made without departing from the technical principles of the present invention. These improvements And replacement should also be regarded as the protection scope of the present invention.

Claims (5)

1. a novel expansion bolt, is characterized in that, comprises hexagonal bolt, expansion pipe and special-shaped nut, described hexagonal bolt is provided with cylindrical part and threaded part, described expansion pipe is provided with circular pipe part and expansion part, described cylindrical The outer diameter of the threaded portion is matched with the inner diameter of the circular pipe portion, and the threaded portion is threadedly connected to the special-shaped nut through the expansion portion. The special-shaped nut is provided with a conical truncated portion and a circular truncated portion. The outer diameter of the expansion part is larger than the inner diameter of the expansion part in the free state, the outer diameter of the circular truncated part matches the inner diameter of the expansion part in the free state, the outer circumference of the expansion part is provided with a slotted guide groove, the The outer periphery of the circular truncated portion is provided with a guide block matched with the slotted guide groove. 2 . The new type of expansion bolt according to claim 1 , wherein the end of the threaded portion is provided with an axial limiter for preventing the special-shaped nut from being separated from the threaded portion. 3 . 3 . The new type of expansion bolt according to claim 2 , wherein the axial limiting member is a split pin, and the end of the threaded portion is provided with a pin hole connected with the split pin. 4 . 4 . The new type of expansion bolt according to claim 1 , wherein the cross-section of the slotted guide groove is T-shaped, and the cross-section of the guide block is T-shaped. 5 . 5. The new type of expansion bolt according to claim 1, wherein the expansion pipe is provided with a hexagonal head.

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