CN223004278U - Expansion bolt and connecting assembly - Google Patents

Abstract

The utility model relates to an expansion bolt and a connecting assembly, wherein the expansion bolt comprises a movable sleeve, a screw rod and a nut, a thread matched with the nut is arranged on the side wall of a first end of the screw rod, a tooth trace is arranged on the side wall of a second end of the screw rod, the movable sleeve is extruded and then expands radially outwards, an inner tooth trace matched with the tooth trace of the screw rod is arranged on the inner side wall of the movable sleeve, and friction traces for enhancing friction force are arranged on the outer side wall of the movable sleeve. When the screw rod fixing device is used, the movable sleeve is plugged into the hole, then the screw rod is knocked into the movable sleeve, the screw rod extrudes the movable sleeve through the insection to expand outwards, so that the movable sleeve is fixed in the hole, and the screw rod is also fixed through interaction of the insection, so that the screw rod is prevented from loosening and withdrawing. According to the scheme, the external side wall of the screw rod of the expansion bolt is provided with the insection, the inner wall of the movable sleeve is provided with the insection, and the outer wall of the movable sleeve is provided with the friction insection, so that the fixing effect of the expansion bolt is well enhanced, and the loosening of the fixing frame is avoided.

Description

Expansion bolt and connecting assembly

Technical Field

The utility model relates to the technical field of mechanical parts, in particular to an expansion bolt and a connecting assembly.

Background

Bolt assemblies are known as "adhesives" between mechanical parts and are commonly used to effect fastening of workpieces. The expansion bolt is a special threaded connector for fixing the pipeline support/hanging/bracket or equipment on a wall, a floor slab and a column. The existing expansion bolt consists of a countersunk head bolt, an expansion pipe, a flat washer, a spring pad and a hexagonal nut. When the fixing device is used, holes with corresponding sizes are drilled on the fixing body, then the bolts and the expansion pipes are arranged in the holes, and the bolts, the expansion pipes, the mounting pieces and the fixing body can be expanded into a whole by screwing the nuts. However, the existing expansion bolts are easy to loosen for a softer foundation body, so that the phenomenon of unstable bolt fixation greatly influences the fixation effect, and the problem of unstable fixation and even possible component falling-off can occur due to fewer expansion pipe fixing points of the existing expansion bolts.

Disclosure of utility model

Accordingly, it is necessary to provide an expansion bolt and a connecting assembly for solving the problem that the conventional expansion bolt is not firmly fixed.

The embodiment provides an expansion bolt, which comprises a movable sleeve, a screw rod and a nut;

The first end side wall of the screw is provided with threads matched with the nut, and the second end side wall of the screw is provided with insections;

The movable sleeve is extruded and then radially expands outwards, the inner side wall of the movable sleeve is provided with inner corrugations matched with the corrugations of the screw, and the outer side wall of the movable sleeve is provided with friction corrugations for enhancing friction force.

Further, the insection of the screw rod and the insection of the movable sleeve are annular insections. The insections of the screw gradually incline radially outwards from the second end to the first end. The internal teeth of the movable sleeve taper radially inwardly from the first end toward the second end.

Further, the movable sleeve is made of metal sheets which are bent into a ring shape, and a plurality of protruding parts are arranged on the outer side wall of the movable sleeve.

Further, a raised beating portion is arranged at the first end face position of the screw, and the diameter of the beating portion is smaller than that of the screw body.

Further, the thickness of the wall of the movable sleeve gradually increases from the first end to the second end, or the thickness of the screw gradually increases from the second end to the first end.

On the other hand, the utility model also provides a connecting assembly which is fixed by using the expansion bolt.

According to the scheme provided by the utility model, the external side wall of the screw rod of the expansion bolt is provided with the insections, the inner wall of the movable sleeve is provided with the insections, and the outer wall of the movable sleeve is provided with the friction insections, so that the fixing effect of the expansion bolt is well enhanced, and the loosening of the fixing frame is avoided. When the screw rod fixing device is used, the movable sleeve is plugged into the hole, then the screw rod is knocked into the movable sleeve, the screw rod extrudes the movable sleeve through the insection to expand outwards, so that the movable sleeve is fixed in the hole, and the screw rod is also fixed through interaction of the insection, so that the screw rod is prevented from loosening and withdrawing.

Drawings

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

FIG. 2 is a schematic view showing the construction of an expansion bolt according to an embodiment of the present utility model at the time of the first step of installation;

FIG. 3 is a schematic view showing the construction of an expansion bolt according to an embodiment of the present utility model at the time of the second step of installation;

FIG. 4 is a schematic view of a movable sleeve of an expansion bolt according to an embodiment of the present utility model;

FIG. 5 is a schematic view of an expansion bolt according to an embodiment of the present utility model after the expansion sleeve is expanded;

FIG. 6 is a schematic cross-sectional view of an expansion bolt according to an embodiment of the present utility model;

fig. 7 is a schematic view showing a screw structure of an expansion bolt according to an embodiment of the present utility model.

In the drawings, the list of components represented by the various numbers is as follows:

1. The movable sleeve comprises a movable sleeve body, an inner tooth line, a friction line, a screw rod, a screw thread, a tooth line, a beating part, a nut, a spring pad and a gasket.

Detailed Description

So that the manner in which the above recited objects, features and advantages of the present utility model can be understood in detail, a more particular description of the utility model, briefly summarized below, may be had by reference to the appended drawings. It is apparent that the specific details described below are only some of the embodiments of the present utility model and that the present utility model may be practiced in many other embodiments that depart from those described herein. Based on the embodiments of the present utility model, all other embodiments obtained by a person of ordinary skill in the art without making any inventive effort are within the scope of the present utility model.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

In one embodiment, referring to fig. 1 to 7, the present utility model provides an expansion bolt, comprising a movable sleeve 1, a screw 2 and a nut 3, wherein,

The first end side wall of the screw rod 2 is provided with threads 21 matched with the nut 3, and the second end side wall of the screw rod 2 is provided with insections 22;

The movable sleeve 1 is radially outwards expanded after being extruded, the inner side wall of the movable sleeve 1 is provided with inner corrugations 11 which are matched with the corrugations 22 of the screw rod 2, and the outer side wall of the movable sleeve 1 is provided with friction corrugations 12 which are used for enhancing friction force.

Referring to fig. 2 and 3, the scheme provided by the utility model has the advantages that the external side wall of the screw rod 2 of the expansion bolt is provided with the insection 22, the inner wall of the movable sleeve 1 is provided with the insection 11, and the outer wall is provided with the insection 12, so that the fixing effect of the expansion bolt is well enhanced, and the loosening of the fixing frame is avoided. When the screw rod 2 is used, the movable sleeve 1 is plugged into the hole, the screw rod 2 is knocked into the movable sleeve 1, the screw rod 2 is extruded to expand outwards through the insection, the movable sleeve 1 is fixed in the hole, and the screw rod 2 is fixed through interaction of the insection, so that the screw rod 2 is prevented from loosening and withdrawing.

Referring to fig. 4, 5 and 6, in the embodiment of the present utility model, the insection 22 of the screw 2 and the insection 11 of the movable sleeve 1 are both annular insections. The flights 22 of the screw 2 taper radially outwardly from the second end to the first end. The internal teeth of the movable sleeve 1 taper radially inwards from the first end towards the second end.

It can be understood that the annular insection structure is convenient for process, and the insection of slope is convenient for screw rod 2 insert movable sleeve, can avoid screw rod 2 not hard up withdrawal movable sleeve after fixed completion, has promoted the convenience, the stability of bolt assembly by a wide margin.

Referring to fig. 6, in the present embodiment, further, a raised striking portion 23 is provided at the first end face position of the screw 2, and the diameter of the striking portion 23 is smaller than the diameter of the screw 2 main body. Specifically, the striking portion 23 has a truncated cone shape gradually radially reduced in the axial direction of the screw 2.

It should be noted that, when the screw 2 is installed, the screw is required to be knocked and then enters the movable sleeve 1, and the end surface of the screw 2 may be deformed during the knocking, and in this embodiment, the reduced knocking portion 23 is provided on the end surface, so that the nut 3 cannot be sleeved into the screw 2 to be screwed after the screw is prevented from being deformed.

Further, referring to fig. 5, the movable sleeve 1 is made of metal sheet bent into a ring shape, and the outer side wall of the movable sleeve 1 is uniformly provided with a plurality of protruding parts. The shape and position distribution of the protruding portion are not so versatile as to enhance the fixing effect, and are not limited in this embodiment.

Wherein, the movable sleeve 1 which is made of metal sheet and is bent into a ring shape is convenient for radial outward expansion after being extruded by the screw rod 2, thereby realizing the product function. Wherein the movable sleeve may be made of iron, steel or other materials, which is not described as a limitation in this embodiment.

It can be understood that when in use, the movable sleeve 1 is expanded, the protruding part is extruded into the wall body to form a plurality of fixing points, the fixing effect of the expansion bolts is greatly enhanced, the problem of loosening of the bolts caused by single fixing points is avoided, and the stability of the product is ensured.

In an embodiment of the present utility model, the thickness of the wall of the movable sleeve 1 gradually increases from the first end toward the second end. It can be appreciated that through this kind of structure, at the in-process that screw rod 2 beaten into movable sleeve 1, movable sleeve 1 can be expanded gradually after being extruded by screw rod 2 to with the wall body extrusion fixed in the outside, can promote fixed effect well through this structure, prevent to loosen and take off. Of course, other structures may be used for the purpose of squeezing the expandable active sleeve 1 according to the solution of the present utility model, which is not intended to be limiting in this embodiment.

In another embodiment of the utility model, the screw 2 tapers from the second end towards the first end. It should be noted that, in the same way as the previous embodiment, during the process of driving the screw rod 2 into the movable sleeve 1, the movable sleeve 1 is gradually expanded after being extruded by the screw rod 2 and is extruded and fixed with the wall body at the outer side, and the fixing effect can be well improved by the structure, so as to prevent loosening.

In the embodiment of the utility model, a spring pad 4 and a gasket 5 are sequentially arranged between the movable sleeve 1 and the nut 3, and the nut 3 is a locknut 3. Through the structure, the combination tightness degree between the screw rods 2 of the nuts 3 is increased, the loosening of the nuts 3 is avoided, and the fixing effect is improved. The locknut 3 may be mechanical, friction, or structural, among others, and is not described as a limitation in this embodiment.

On the other hand, the utility model also provides a connecting component which uses the expansion bolt and the related matched component to carry out fixed connection work.

When the expansion bolt is used, the corresponding movable sleeve 1 is sleeved in a drill hole, the screw rod 2 is inserted, and the end head of the screw rod 2 is beaten by using weights such as hammers, so that the movable sleeve 1 is matched with the screw rod 2 in terms of width and small inside. The screw rod 2 extends into the movable sleeve 1 through hammering, the screw rod 2 is tightly meshed with the sleeve through the tooth patterns matched with the screw rod 2 of the movable sleeve 1, the movable sleeve 1 is opened in the hammering process, and the movable sleeve 1 is tightly attached to a wall. Because the rough raised friction lines 12 are arranged on the outer side of the movable sleeve 1, the friction force with the wall is increased, the raised parts are fastened in a mode of being embedded into the wall, and the like, a plurality of fixing points are formed, and loosening caused by a single fixing point of a traditional expansion bolt is avoided. The scheme not only solves the problem that the expansion bolts are easy to loosen, but also is more suitable for places with softer foundations than the traditional expansion bolts. After the movable sleeve 1 and the screw rod 2 are installed, a fixed workpiece can be assembled, and then the elastic sheet, the anti-loose gasket 5 and the fastening anti-loose nut 3 are installed in sequence.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that modifications, substitutions and improvements can be made by those skilled in the art without departing from the spirit of the utility model, and are intended to be within the scope of the utility model. Accordingly, the protection scope of the present utility model is subject to the claims.

Claims (10)

1. An expansion bolt is characterized by comprising a movable sleeve, a screw rod and a nut;

The first end side wall of the screw is provided with threads matched with the nut, and the second end side wall of the screw is provided with insections;

The movable sleeve is extruded and then radially expands outwards, the inner side wall of the movable sleeve is provided with inner corrugations matched with the corrugations of the screw, and the outer side wall of the movable sleeve is provided with friction corrugations for enhancing friction force.

2. The expansion bolt according to claim 1, wherein the insection of the screw and the insection of the movable sleeve are both annular insections.

3. Expansion bolt according to claim 1, wherein the toothing of the screw tapers radially outwards from the second end in the direction of the first end and the internal toothing of the movable sleeve tapers radially inwards from the first end in the direction of the second end.

4. The expansion bolt according to claim 1, wherein the first end face position of the screw is provided with a raised striking portion having a diameter smaller than that of the screw body.

5. Expansion bolt according to claim 1, wherein the movable sleeve is made of sheet metal bent into a ring shape.

6. The expansion bolt according to claim 1, wherein the outer side wall of the movable sleeve is provided with a plurality of projections.

7. The expansion bolt according to any of claims 1 to 6, wherein the thickness of the wall of the movable sleeve increases gradually from the first end towards the second end.

8. The expansion bolt according to any one of claims 1 to 6, wherein the shank is tapered from the second end toward the first end.

9. The expansion bolt according to claim 1, wherein a spring pad and a gasket are further arranged between the movable sleeve and the nut in sequence, and the nut is a locknut.

10. A connection assembly comprising an expansion bolt according to claim 1 to 9.