Expansion pipe and expansion bolt suitable for thin-wall materials

Abstract

The utility model relates to a bolt, and particularly discloses an expansion pipe and an expansion bolt which are suitable for thin-wall materials. The expansion pipe comprises a pipe body, an expansion channel is arranged in the pipe body, the pipe body sequentially comprises a head portion, a middle section and a tail portion in the axial direction, no less than two guide grooves are formed in the middle section, and the guide grooves are spirally arranged in the axial direction of the pipe body. The expansion channel comprises a screwing section and a guiding section which are communicated with each other, the diameter of the screwing section is smaller than that of the guiding section, the screwing section corresponds to the head part, and the guiding section extends to the tail part. Under the guide that the expansion pipe is screwed in in the specific direction of the screw, the middle section firstly expands outwards and then is wound into a cluster, the expansion pipe is prevented from retreating from the base part, then reliable connection is achieved, and the requirement for the thickness of base part materials is effectively lowered.

Description

TECHNICAL FIELD

[0001] The utility model relates to a bolt, specifically relates to an expansion pipe and expansion bolt suitable for thin wall material. BACKGROUND

[0002] The expansion bolt is a threaded connecting piece for connecting equipment on the base such as wall surface, ground and board. Compared with the conventional bolt, the expansion bolt comprises an expansion pipe, in use, the bolt is screwed into the expansion pipe, the expansion pipe can be deformed and expanded to be tightly expanded with the hole on the base, thus having good connection reliability.

[0003] The expansion bolt usually has a large length-diameter ratio, in order to ensure the connection reliability, a deep base hole is usually provided on the base to cooperate with the expansion bolt. However, for the base with small thickness such as hollow brick, gypsum board and other thin boards, even if a through hole is provided, the effective contact length of the base with the expansion bolt is limited, the conventional expansion bolt structure has the risk of insufficient connection strength, and the connection reliability cannot be ensured. SUMMARY

[0004] The utility model solves the technical problem to provide an expansion pipe and expansion bolt suitable for thin wall material, under the guidance of screwing in a specific direction, the middle section is first expanded outward and then wound into a group, and the expansion pipe is prevented from being pulled out of the base, thereby realizing reliable connection and effectively reducing the thickness requirement of the base material.

[0005] In order to solve the above technical problem, the utility model provides the technical scheme as follows: an expansion pipe suitable for thin wall material, comprising a pipe body, an expansion channel is arranged in the pipe body, the pipe body comprises a head, a middle section and a tail along the axial direction in sequence, at least two guide grooves are arranged on the middle section, and the guide grooves are arranged in a spiral along the axial direction of the pipe body.

[0006] The expansion channel comprises a screwing section and a guide section which are communicated with each other, the diameter of the screwing section is smaller than that of the guide section, the screwing section corresponds to the head, and the guide section extends to the tail.

[0007] In use, the expansion pipe is inserted into the base hole of the base, and then the screw is screwed in, the diameter of the matched screw is slightly smaller than that of the guide section and larger than that of the screwing section, so that the screw is engaged with the screwing section and rotates. The rotation direction of the screw is opposite to that of the guide groove, under the rotation of the screw, the middle section is first expanded outward under the guidance of the guide groove, and then wound into a group, and the expansion pipe is prevented from being pulled out of the base, thereby realizing reliable connection and effectively reducing the thickness requirement of the base material, and the base connection working condition of large thickness and small thickness can be simultaneously adapted.

[0008] As preferred, the outer side of the pipe body is provided with a transition groove, which is arranged between the head and the middle section, and between the middle section and the tail. The transition groove can increase the friction between the outer side of the pipe body and the base, and further improve the connection reliability.

[0009] As preferred, the head is provided with an expansion groove, which is arranged along the pipe body in the radial direction. The expansion groove can form a connection force between the head and the base along with the expansion and expansion of the head during the insertion of the screw.

[0010] As preferred, the outer side of the tail of the pipe body is provided with a plurality of rib plates, which extend along the pipe body in the axial direction and are uniformly distributed in the circumferential direction around the pipe body. The connection rib plate can be well matched with the base to avoid the rotation of the expansion pipe during the screw rotation, and ensure the smooth operation of the connection.

[0011] As preferred, the tail of the pipe body is provided with an annular stop ring, which can play an axial positioning role for the insertion of the pipe body.

[0012] As preferred, the outer side of the middle section is concave, which can provide sufficient space for the expansion and winding of the middle section.

[0013] An expansion bolt suitable for thin-walled materials, which comprises an expansion pipe and a screw, wherein the expansion pipe is the expansion pipe as described above, and the diameter of the screw is greater than that of the screwing section and smaller than that of the guide section. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 The structure diagram of the expansion pipe suitable for thin-walled materials of the embodiment;

[0015] Fig. 2 The front view of the expansion pipe suitable for thin-walled materials of the embodiment;

[0016] Fig. 3 The front view of the expansion pipe suitable for thin-walled materials of the embodiment; DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the utility model more clear, the following will be further described in detail by combining with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model, and are not used to limit the utility model. EMBODIMENT

[0018] As Figs. 1-3As shown in the figure, an expansion pipe suitable for thin-wall material includes a pipe body, the pipe body is provided with an expansion channel 8, the pipe body includes a head 1, an intermediate section 2 and a tail 3 in sequence along the axial direction, the intermediate section 2 is provided with not less than two guide grooves 7, the guide grooves 7 are provided in a spiral along the axial direction of the pipe body. The outer side of the intermediate section 2 is concave, which provides sufficient space for the expansion and winding of the intermediate section 2. The head 1 is provided with an expansion groove 11, the expansion groove 11 is provided through the pipe body along the radial direction of the pipe body. With the insertion of the screw, the expansion and expansion of the head 1 along the expansion groove 11 form a connecting force between the head 1 and the base. As a specific embodiment, the expansion groove 11 extends to the tail 3. Specifically, the expansion groove 11 can extend to the end face of the tail 3 of the pipe body.

[0019] As shown in the figure, Figs. 1-3 The expansion channel 8 includes a screwing section 81 and a guide section 82 which are in communication with each other, the diameter of the screwing section 81 is smaller than that of the guide section 82, the screwing section 81 corresponds to the head 1, and the guide section 82 extends to the tail 3.

[0020] In use, the expansion pipe is inserted into the base hole of the base, and then the screw is screwed in, the diameter of the matched screw is slightly smaller than that of the guide section 82 and larger than that of the screwing section 81, so that the screw engages with the screwing section 81 and rotates with it. The rotation direction of the screw is opposite to that of the guide groove 7. With the screwing of the screw, the intermediate section 2 is first expanded outward under the guidance of the guide groove 7, and then wound into a bundle, thereby preventing the expansion pipe from being pulled out of the base, and further realizing reliable connection and effectively reducing the thickness requirement of the base material. It can also adapt to the connection working conditions of bases with large and small thicknesses at the same time.

[0021] As shown in the figure, Figs. 1-3 Further, the outer side of the pipe body is provided with a transition groove 6, which is arranged between the head 1 and the intermediate section 2, and between the intermediate section 2 and the tail 3. The arrangement of the transition groove 6 can increase the friction between the outer side of the pipe body and the base, and further improve the connection reliability.

[0022] As shown in the figure, Figs. 1-3 The outer side of the tail 3 of the pipe body is provided with a plurality of rib plates 5, which extend along the axial direction of the pipe body and are uniformly distributed in a ring shape around the pipe body. The connection rib plate 5 can be well matched with the base to avoid the rotation of the expansion pipe during the screwing process, and ensure the smooth operation of the connection operation. The tail 3 of the pipe body is provided with a ring-shaped stop ring 4, which can axially position the insertion of the pipe body.

[0023] An expansion bolt suitable for thin-wall material includes an expansion pipe and a screw, wherein the expansion pipe is the expansion pipe as described above, and the diameter of the screw is larger than that of the screwing section 81 and smaller than that of the guide section 82.

[0024] In summary, the above only for the preferred embodiments of the present application, and not to limit the present application, any modification, equivalent replacement and improvement, etc. made within the spirit and principles of the present application, should be included in the scope of protection of the present application.

Claims

1. An expansion tube suitable for thin-walled materials, comprising a tube body, wherein the tube body is provided with an expansion channel, characterized in that: The tube body comprises a head, a middle section and a tail in sequence along the axial direction, and the middle section is provided with at least two guide grooves, and the guide grooves are spirally arranged along the axial direction of the tube body; The expansion channel includes a spiral segment and a guide segment that are interconnected. The diameter of the spiral segment is smaller than that of the guide segment. The spiral segment corresponds to the head portion, and the guide segment extends to the tail portion.

2. The expansion tube according to claim 1, characterized in that: The outer side surface of the tube body is provided with a transition groove, and the transition groove is arranged between the head and the middle section, and between the middle section and the tail.

3. The expansion tube according to claim 1, characterized in that: The head is provided with an expansion groove, and the expansion groove is arranged along the radial direction of the tube body and penetrates the tube body.

4. The expansion tube according to claim 1, characterized in that: A plurality of ribs are provided on the outer side surface of the tail portion of the tube body. The ribs extend axially along the tube body and are evenly distributed in an annular shape around the circumference of the tube body.

5. The expansion tube according to claim 4, characterized in that: An annular retaining ring is provided at the tail of the tube body.

6. The expandable tube according to any one of claims 1 to 5, characterized in that: The outer side surface of the middle segment is concave.

7. An expansion bolt suitable for thin-walled materials, comprising an expansion tube and a screw, characterized in that: The expansion tube is the expansion tube according to any one of claims 1 to 6, and the diameter of the screw is larger than the screwing segment and smaller than the guide segment.

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