Expansion pipe bolt

Abstract

The utility model discloses an expansion pipe bolt, which belongs to the technical field of bolt fasteners and solves the problem of poor assembly stability of the expansion pipe bolt in the prior art, the expansion pipe bolt comprises a fastening bolt and an expansion sleeve, the end part of the expansion sleeve is provided with an expansion part, and the expansion part is formed by circumferentially distributing saw teeth; in addition, the expansion sleeve is further provided with a tubular part, barbs are distributed on the side wall of the tubular part, and included angles exist between the barbs and distribution lines, axially distributed on the side wall of the expansion sleeve, of the expansion sleeve, so that the number of anchor points of the expansion pipe bolt and a wall is increased when the expansion pipe bolt is used, and the stabilizing effect is guaranteed. The end of the expansion sleeve is further provided with the notches, when the notches are matched with the sawteeth, the stability of the expansion sleeve in use is enhanced, in addition, the expansion sleeve is provided with the open grooves to form the expansion portion, and the expansion portion is not prone to deformation. After the conical table at the end of the fastening bolt enters the expansion sleeve, the expansion part expands, and the fastening effect of the expansion pipe bolt and the wall is further guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of bolt fasteners, and in particular relates to an expansion tube bolt. Background Art

[0002] An expansion tube bolt is a component that is opened in a wall and fastened in the hole in the wall for assembling other components. Currently, the wall is built with foam bricks. Since foam bricks have a hollow structure, the wall built with foam bricks is a hollow wall structure. When the expansion tube bolt is fixed to the wall, it is easy to loosen, causing certain inconveniences to the subsequent assembly of other components.

[0003] At present, the structure of expansion tube bolts is diverse. For example, Chinese utility model patent CN216895237U applied by patentee Yang Jukui discloses an expansion tube bolt specially used for foam bricks. The expansion tube bolt comprises a bolt body, an expansion sleeve and a nut for tightening the expansion sleeve. One end of the expansion sleeve in the expansion tube bolt is provided with serrations, and the expansion sleeve is provided with raised single barbs and double barbs, the single barbs and double barbs are arranged at intervals along the axial direction, and there is a double barb between every two adjacent single barbs along the axial direction. When the above-mentioned expansion tube bolt is used, the single barb and the double barb pierce into the hole wall of the foam brick, which makes the expansion tube bolt more firmly bite and prevent it from falling off, thereby achieving the purpose of fastening and assembly.

[0004] Although the above-mentioned expansion tube bolt can enhance the firmness with the wall when in use, the above-mentioned expansion tube bolt still has the following inconveniences during use. For example, the single barb and the double barb in the above-mentioned expansion tube bolt are oriented in the same direction and are both located on the side wall of the expansion sleeve along the axial direction of the expansion sleeve. Therefore, after the expansion sleeve enters the hole in the wall, there are scratches between the single barb and the double barb and the wall due to the tip of the barb. The tip of the next single barb or double barb distributed along the longitudinal direction will not enter the scratch caused by the previous single barb or double barb, thereby resulting in a decrease in the tightness between the expansion tube bolt and the wall, causing certain inconveniences in the use of the collision tube bolt. Utility Model Content

[0005] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and utility model name of this application to avoid blurring the purpose of this section, specification abstract and utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0006] In order to solve the problem in the prior art that the expansion tube bolts are not assembled tightly enough with the wall when in use, the utility model adopts the following technical solution.

[0007] An expansion tube bolt comprises a fastening bolt and an expansion sleeve, wherein the expansion sleeve is threadedly sleeved on the fastening bolt, and a horn portion and a tubular portion are arranged at the end of the expansion sleeve, wherein the horn portion comprises a plurality of serrations axially distributed at the end of the expansion sleeve, and a plurality of barbs are distributed on the side wall of the tubular portion of the expansion sleeve, and an angle exists between the direction of the barbs and the distribution line of the projection of the axis of the expansion sleeve on the side wall of the expansion sleeve.

[0008] Preferably, in the above expansion tube bolt, the angle between the direction of the barb and the distribution line of the projection of the axis of the expansion casing on the side wall of the expansion casing is between 0 and 30 degrees.

[0009] Preferably, in the above expansion tube bolt, the barbs are circumferentially distributed on the side wall of the expansion casing, or the barbs are spirally distributed on the side wall of the expansion casing.

[0010] Preferably, the expansion tube bolts are composed of a plurality of expansion sleeves connected in sequence and fastening bolts, and the fastening bolts penetrate the plurality of expansion sleeves connected in sequence and are threadedly connected to the expansion sleeves.

[0011] Preferably, in the above expansion tube bolt, a notch is provided at the end of the expansion sleeve away from the horn portion, and when adjacent expansion sleeves are connected in sequence, the serrations at the end of the expansion sleeve enter into the notch of the adjacent expansion sleeve.

[0012] Preferably, in the above expansion tube bolt, a conical platform is provided at one end of the fastening bolt away from the flared portion of the expansion casing, the outer diameter of the conical platform is larger than the outer diameter of the tubular portion of the expansion casing, and the conical platform abuts against the end of the expansion casing after the fastening bolt passes through the expansion casing.

[0013] Preferably, in the above expansion tube bolt, the expansion sleeve also includes an expansion portion, which is adjacent to the tubular portion, and barbs are distributed on the side wall of the expansion portion of the expansion sleeve. When the expansion tube bolt is in use, the expansion portion expands so that the barbs are anchored on the wall.

[0014] Preferably, in the above-mentioned expansion tube bolt, an open groove is provided on the side wall of the expansion part of the expansion sleeve, and the open groove is annularly distributed on the side wall of the expansion part. After the conical platform of the fastening bolt enters the expansion sleeve, the conical platform cooperates with the open groove to drive the side wall of the expansion part to expand.

[0015] Preferably, in the above expansion tube bolt, the distance between the tip of the serrations at the end of the expansion sleeve and the side wall of the expansion sleeve is between 1 and 1.5 mm.

[0016] Preferably, in the above-mentioned expansion tube bolt, the outer diameter of the tubular portion of the expansion sleeve is 3 mm.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] (1) The expansion tube bolt in the utility model comprises an expansion sleeve and a fastening bolt. A plurality of barbs are distributed on the side wall of the expansion sleeve, and the direction of the barbs forms an angle with the distribution line of the expansion sleeve axially distributed on the side wall of the expansion sleeve, thereby increasing the number of anchor points between the barbs and the wall after the expansion sleeve enters the wall, thereby ensuring the fastening effect between the expansion tube bolt and the wall.

[0019] (2) There are multiple expansion sleeves in the expansion tube bolt in the utility model, and serrations and grooves are provided at both ends of the expansion sleeves. When adjacent expansion sleeves are connected, the serrations enter into the grooves of the adjacent expansion sleeves, thereby improving the overall stability of the expansion sleeves, ensuring the tightness between the expansion tube bolt and the wall, and improving the stabilization effect.

[0020] (3) The expansion sleeve in the expansion tube bolt of the utility model is provided with an expansion part, an open groove is provided at the position of the expansion part, and a conical platform is provided at the end of the fastening bolt. When the expansion tube bolt enters the wall and the fastening bolt moves in the expansion sleeve, the conical platform drives the expansion part to expand, so that the fastening between the barbs on the expansion part and the wall is enhanced, further ensuring the stability between the expansion tube bolt and the wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the expansion tube bolt in the utility model;

[0022] Figure 2 for Figure 1 The local structure diagram in ;

[0023] Figure 3 for Figure 1 A front view of

[0024] Figure 4 It is a schematic diagram of the split structure of the expansion tube bolt in the utility model;

[0025] Figure 5 This is a structural schematic diagram of another embodiment of the expansion tube bolt in the utility model;

[0026] Figure 6 It is a structural schematic diagram of the expansion casing in the utility model;

[0027] Figure 7 for Figure 6 The use status diagram of the expansion casing;

[0028] Figure 8 for Figure 7 Structural schematic diagram of the expansion bolts in use status.

[0029] The corresponding relationship between the various figure labels and component names in the figure is as follows:

[0030] 100, fastening bolt; 101, fastening nut; 102, flat washer; 103, conical platform;

[0031] 200, expansion sleeve; 201, barb; 202, serration; 203, notch; 204, open slot. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0033] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0034] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments. The present invention provides the following embodiments.

[0035] like Figures 1 to 3 As shown, it is a schematic diagram of the structure of the expansion tube bolt in this embodiment. The expansion tube bolt in this embodiment is used to be assembled on a wall made of foam bricks. The expansion tube bolt in this embodiment includes a fastening bolt 100 and an expansion sleeve 200 threadedly assembled on the fastening bolt 100. When assembling the expansion tube bolt in this embodiment, a hole is first opened on the wall, and the above-mentioned expansion tube bolt is assembled in the hole. The expansion tube bolt also includes a fastening nut 101 and a flat washer 102. After the expansion tube bolt enters the hole in the wall, the fastening nut 101 is screwed to drive the expansion sleeve 200 to move. In the embodiment, barbs 201 are provided on the side wall of the expansion sleeve 200. When the expansion sleeve 200 moves, the barbs 201 open and form anchor points with the wall, thereby achieving the purpose of tightening the expansion tube bolts. In addition, the fastening bolt 100 in this embodiment is integrally formed with a conical platform 103 at one end away from the fastening bolt 100. The expansion sleeve 200 is threadedly sleeved on the outside of the fastening bolt 100 and the conical platform 103 abuts against the end of the expansion sleeve 200. In this embodiment, the outer diameter of the conical platform 103 is larger than the inner diameter of the expansion sleeve 200, thereby avoiding the problem of the fastening bolt 100 and the expansion sleeve 200 being detached.

[0036] like Figure 1 , Figure 2As shown, in this embodiment, the barbs 201 on the side wall of the expansion casing 200 are located on the side wall of the expansion casing 200 and are distributed along the axial direction of the expansion casing 200. Figure 3 As shown, the expansion sleeve 200 in this embodiment is divided into a tubular portion and a trumpet portion, the tubular portion is a hollow cylindrical structure, the trumpet portion is located at one end of the expansion sleeve 200 and presents a trumpet distribution shape, and the trumpet portion in this embodiment is composed of a plurality of serrations 202, and the serrations 202 are circumferentially distributed at one end of the expansion sleeve 200 and distributed outwardly to form a trumpet shape, in this embodiment, the distance between the tip of the serrations 202 and the side wall of the expansion sleeve 200 is between 1 and 1.5 mm, and the outer diameter of the tubular portion of the expansion sleeve 200 is 3 mm, in this embodiment, after the expansion tube bolt enters the hole in the wall, the expansion sleeve 200 is driven to move by tightening the fastening nut 101 so that the serrations 202 and the barbs on the side wall of the expansion sleeve 200 are anchored into the wall to achieve fixation between the expansion tube bolt and the wall.

[0037] It is worth noting that the barbs 201 in this embodiment are distributed on the side wall of the expansion casing 200, the tip of the barb 201 is oriented in the same direction as the axis of the expansion casing 200, and / or the direction of the barb 201 is offset relative to the axis of the expansion casing 200, such as Figure 2 As shown, in this embodiment, the angle between the direction of the barb 201 and the distribution line of the projection of the axis of the expansion sleeve 200 on the side wall of the expansion sleeve 200 is α. In this embodiment, the angle α is between 0 and 30°. In this embodiment, the barb 201 is offset on the side wall of the expansion sleeve 200, so that when the expansion tube bolt enters the wall, different scratches are generated on the tips of the barbs 201 adjacent to each other along the longitudinal direction of the expansion sleeve 200, thereby increasing the number of anchor points between the expansion tube bolt and the wall and ensuring the tightness between the expansion tube bolt and the wall.

[0038] It is also worth noting that the barbs 201 in this embodiment are distributed in a circular shape on the side wall of the expansion sleeve 200, and can also be distributed in a spiral shape on the side wall of the expansion sleeve 200. In this embodiment, the stability of the expansion tube bolt assembly in the wall is improved by offsetting and / or distributing the tip of the barb 201.

[0039] like Figure 4 as well as Figure 5As shown, the expansion tube bolt in this embodiment also includes a fastening bolt 100 and a plurality of expansion sleeves 200 arranged in sequence. The expansion sleeve 200 in this embodiment is also provided with a slot 203 on the side wall of the port away from the end of the horn portion. In this embodiment, when a plurality of expansion sleeves 200 are sequentially connected to the fastening bolt 100, the serrations 202 of the expansion sleeve 200 are located in the slot 203 of the adjacent expansion sleeve 200, so that the plurality of expansion sleeves 200 are connected as a whole, thereby avoiding the rotation of individual expansion sleeves 200 and further ensuring the stability of the expansion tube bolt.

[0040] In addition, if Figures 6 to 8 As shown, it is a structural schematic diagram of another embodiment of the expansion casing 200 in this embodiment. The expansion casing 200 in this embodiment has an open groove 204 on its side wall. The open groove 204 in this embodiment is distributed along the axial direction on the side wall of the expansion casing 200 and extends to the port of the expansion casing 200. Figure 6 as well as Figure 7 As shown, the expansion sleeve 200 includes a tubular portion, a horn portion and an expansion portion. The opening groove 204 is located on the side wall of the expansion portion of the expansion sleeve 200. After the expansion tube bolt enters the wall hole, the fastening nut 101 rotates to drive the fastening bolt 100 to move, and the conical platform 103 at the end of the fastening bolt 100 moves into the expansion sleeve 200 to push the side wall of the expansion portion of the expansion sleeve 200 to open. The effect is as follows Figure 8 As shown, when the side wall of the expansion portion is opened, the barbs 201 on the side wall of the expansion sleeve 200 are in close contact with the wall to form an anchor point, which further ensures the stability of the expansion tube bolt and the wall and improves the fastening effect. In this embodiment, the direction of the barbs 201 on the side wall of the expansion sleeve 200 is offset and the notch 203 or the open groove 204 is set to ensure the assembly effect of the expansion tube bolt and the wall.

[0041] The above content is a further detailed description of the utility model in combination with specific implementation methods. It cannot be determined that the specific implementation of the utility model is limited to these descriptions. For ordinary technicians in the technical field to which the utility model belongs, without departing from the concept of the utility model, they can also make several simple deductions or substitutions, which should be regarded as belonging to the scope of protection determined by the claims submitted for the utility model.

Claims

1. An expansion pipe bolt, comprising a fastening bolt (100) and an expansion sleeve (200), wherein the expansion sleeve (200) is threadedly sleeved on the fastening bolt (100), and the end of the expansion sleeve (200) is provided with a flared portion and a tubular portion, wherein the flared portion is composed of a plurality of saw teeth (202) axially distributed on the end of the expansion sleeve (200), and a plurality of barbs (201) are distributed on the side wall of the tubular portion of the expansion sleeve (200), characterized in that: There is an angle between the direction of the barb (201) and the distribution line of the axis of the expansion casing (200) projected on the side wall of the expansion casing (200).

2. The expansion tube bolt according to claim 1, characterized in that: The angle between the direction of the barb (201) and the distribution line of the axis of the expansion casing (200) projected on the side wall of the expansion casing (200) is between 0 and 30 degrees.

3. The expansion tube bolt according to claim 1, characterized in that: The barbs (201) are circumferentially distributed on the side wall of the expansion casing (200), or the barbs (201) are spirally distributed on the side wall of the expansion casing (200).

4. The expansion tube bolt according to claim 1, characterized in that: The invention is composed of a plurality of expansion sleeves (200) connected in sequence and a fastening bolt (100). The fastening bolt (100) penetrates the plurality of expansion sleeves (200) connected in sequence and is threadedly connected to the expansion sleeves (200).

5. The expansion tube bolt according to claim 4, characterized in that: A notch (203) is provided at the port of the expansion sleeve (200) away from the horn portion. When adjacent expansion sleeves (200) are connected in sequence, the serrations (202) at the end of the expansion sleeve (200) enter into the notch (203) of the adjacent expansion sleeve (200).

6. The expansion tube bolt according to any one of claims 1 to 5, characterized in that: A conical platform (103) is provided at one end of the fastening bolt (100) away from the horn portion of the expansion sleeve (200); the outer diameter of the conical platform (103) is greater than the outer diameter of the tubular portion of the expansion sleeve (200); after the fastening bolt (100) passes through the expansion sleeve (200), the conical platform (103) abuts against the end of the expansion sleeve (200).

7. The expansion tube bolt according to claim 6, characterized in that: The expansion sleeve (200) further comprises an expansion portion, which is adjacent to the tubular portion, and barbs (201) are distributed on the side wall of the expansion portion of the expansion sleeve (200). When the expansion tube bolt is in use, the expansion portion expands so that the barbs (201) are anchored on the wall.

8. The expansion tube bolt according to claim 7, characterized in that: An open groove (204) is provided on the side wall of the expansion part of the expansion sleeve (200), and the open groove (204) is distributed in an annular shape on the side wall of the expansion part. After the conical platform (103) of the fastening bolt (100) enters the expansion sleeve (200), the conical platform (103) cooperates with the open groove (204) to drive the side wall of the expansion part to expand.

9. The expansion tube bolt according to claim 1, characterized in that: The distance between the tip of the serration teeth (202) at the end of the expansion casing (200) and the side wall of the expansion casing (200) is between 1 and 1.5 mm.

10. The expansion tube bolt according to claim 1, characterized in that: The outer diameter of the tubular portion of the expansion sleeve (200) is 3 mm.

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