Expansion pipe with two-end expansion characteristic and expansion bolt

Abstract

The utility model relates to a bolt, and particularly discloses an expansion pipe with the two-end expansion characteristic and an expansion bolt. The expansion pipe comprises a pipe body, one end of the pipe body is a front end, the other end of the pipe body is a tail end, an expansion channel is arranged in the pipe body, and the expansion channel extends to the tail end in the axial direction. The pipe body is provided with a front expansion groove and a rear expansion groove, and the front expansion groove and the rear expansion groove extend in the axial direction of the pipe body; the front expansion groove extends to the front end of the pipe body and is not communicated with the tail end of the pipe body; the rear expansion groove extends to the tail end of the pipe body and is not communicated with the front end of the pipe body; in the circumferential direction of the pipe body, the front expansion grooves and the rear expansion grooves are arranged in a staggered mode. The head part and the tail part of the expansion pipe have expansion and expansion capabilities, so that the expansion pipe can well adapt to base parts with different thicknesses, and the connection reliability is ensured.

Description

Technical Field

[0001] The utility model relates to a bolt, in particular to an expansion tube and an expansion bolt with expansion characteristics at both ends. Background Art

[0002] Expansion bolts are threaded connectors used to connect equipment to surfaces such as walls, floors, and panels. Unlike conventional bolts, expansion bolts incorporate an expansion tube. During use, the bolt is screwed into the tube by rotating it. The tube expands and deforms, tightening against the opening in the base, providing excellent connection reliability.

[0003] Expansion bolts typically have a large aspect ratio. To ensure a secure connection, a deep hole is typically drilled into the base to accommodate the bolt. However, for thin bases, such as hollow bricks and gypsum boards, even with a through hole, the effective contact length between the base and the expansion bolt is limited. In particular, conventional expansion bolts typically expand at the head but lack the ability to expand at the tail. Using conventional expansion bolts poses the risk of insufficient connection strength, hindering reliable connection. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide an expansion tube and an expansion bolt with expansion characteristics at both ends, which have expansion and expansion capabilities at the head and the tail, can well adapt to bases of different thicknesses, and ensure the reliability of the connection.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: an expansion tube with expansion characteristics at both ends, comprising a tube body, one end of the tube body being a front end and the other end being a tail end, an expansion channel being provided in the tube body, and the expansion channel extending axially to the tail end;

[0006] The tube body is provided with a front expansion groove and a rear expansion groove, and the front expansion groove and the rear expansion groove extend axially along the tube body; the front expansion groove extends to the front end of the tube body and is not connected with the rear end of the tube body; the rear expansion groove extends to the rear end of the tube body and is not connected with the front end of the tube body; in the circumferential direction of the tube body, the front expansion groove and the rear expansion groove are staggered.

[0007] After the matching screws are screwed in, the tube expands outward along the front and rear expansion grooves, achieving a tight connection with the base hole on the base. When the base is thicker, the front and rear ends of the tube expand in different directions, achieving a better connection effect. When the base is thinner, the provision of the rear expansion groove can also ensure sufficient connection force. The expansion tube of the present application has expansion capabilities at both the head and tail, which can well adapt to bases of varying thicknesses and ensure a reliable connection.

[0008] Preferably, in the axial direction of the tube body, the front expansion groove and the rear expansion groove are at least partially overlapped, so that the entire tube body can expand outward in the axial direction, and the connection reliability is very good.

[0009] Preferably, the outer side surface of the rear end of the tube body is provided with a plurality of ribs, which extend axially along the tube body and are evenly distributed in an annular pattern around the circumference of the tube body. The connecting ribs can cooperate well with the base to prevent the expansion tube from rotating during screw insertion, ensuring a smooth connection operation.

[0010] Preferably, an annular retaining ring is provided at the tail end of the tube body, and the annular retaining ring can play an axial positioning role for the insertion of the tube body.

[0011] Preferably, the outer side of the tube body is provided with a plurality of grooves distributed along the axial direction. After the tube body is expanded, the provision of the grooves can increase the friction between the outer side of the tube body and the base, further improving the connection reliability.

[0012] Preferably, the outer side of the tube body is provided with a fin plate, which is inclined toward the rear end of the tube body. During the insertion of the expansion tube into the base, the fin plate contracts to ensure smooth insertion of the tube body. After the expansion tube is fully inserted, the outward expansion trend of the fin plate can prevent the expansion tube from being withdrawn.

[0013] An expansion bolt with expansion characteristics at both ends comprises an expansion tube and a screw, wherein the expansion tube is the expansion tube described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of an expansion tube with expansion characteristics at both ends of this embodiment;

[0015] Figure 2 This is a schematic structural diagram of the expansion tube with expansion characteristics at both ends of this embodiment from another perspective. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Example

[0017] like Figure 1 and Figure 2 As shown, an expansion tube with expansion characteristics at both ends includes a tube body, one end of the tube body is a front end 1, and the other end is a tail end 8. An expansion channel 9 is provided in the tube body, and the expansion channel 9 extends axially to the tail end 8.

[0018] like Figure 1 and Figure 2 As shown, the tube body is provided with a front expansion groove 2 and a rear expansion groove 3, and the front expansion groove 2 and the rear expansion groove 3 extend along the axial direction of the tube body. The front expansion groove 2 extends to the front end 1 of the tube body and is not connected to the rear end 8 of the tube body; the rear expansion groove 3 extends to the rear end 8 of the tube body and is not connected to the front end 1 of the tube body. In the circumferential direction of the tube body, the front expansion groove 2 and the rear expansion groove 3 are staggered. In the axial direction of the tube body, the front expansion groove 2 and the rear expansion groove 3 are at least partially overlapped. In the radial direction of the tube body, the front expansion groove 2 and the rear expansion groove 3 are set through the tube body.

[0019] After the matching screws are screwed in, the tube body expands outwards along the front expansion groove 2 and the rear expansion groove 3 respectively, achieving a compressed connection with the base hole on the base. The tube body can expand outwards as a whole in the axial direction, and the connection reliability is very good. When the thickness of the base is large, the front end 1 and the tail end 8 of the tube body expand in different directions, which can achieve a better connection effect. When the thickness of the base is small, the setting of the rear expansion groove 3 can also ensure that sufficient connection force is provided. The expansion tube of the present application has expansion and expansion capabilities at both the head and the tail, and can adapt well to bases of different thicknesses to ensure the reliability of the connection.

[0020] like Figure 1 and Figure 2 As shown, the outer side of the tube's tail end 8 is provided with several ribs 5. These ribs 5 extend axially along the tube and are evenly distributed around the circumference of the tube. The connecting ribs 5 cooperate well with the base, preventing the expansion tube from rotating during screw insertion and ensuring a smooth connection. The tube's tail end 8 is also provided with an annular retaining ring 4, which provides axial positioning for insertion.

[0021] like Figure 1 and Figure 2 As shown, the outer side of the tube body is provided with a plurality of grooves 7 distributed axially. After the tube body is expanded, the grooves 7 increase the friction between the outer side of the tube body and the base, further improving the connection reliability. The outer side of the tube body is provided with fins 6, which are arranged inclined toward the rear end 8 of the tube body. During the insertion of the expansion tube into the base, the fins 6 retract to ensure smooth insertion of the tube body. Once the expansion tube is in place, the outward expansion of the fins 6 prevents the expansion tube from being withdrawn.

[0022] An expansion bolt with expansion characteristics at both ends comprises an expansion tube and a screw, wherein the expansion tube is the expansion tube described above.

[0023] In short, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An expansion tube with a two-end expansion characteristic, comprising a tube body, one end of the tube body being a front end and the other end being a tail end, an expansion channel being provided in the tube body, the expansion channel extending axially to the tail end; Its characteristics are: The tube body is provided with a front expansion groove and a rear expansion groove, and the front expansion groove and the rear expansion groove extend axially along the tube body; the front expansion groove extends to the front end of the tube body and is not connected with the rear end of the tube body; the rear expansion groove extends to the rear end of the tube body and is not connected with the front end of the tube body; in the circumferential direction of the tube body, the front expansion groove and the rear expansion groove are staggered.

2. The expansion tube according to claim 1, characterized in that: In the axial direction of the tube body, the front expansion groove and the rear expansion groove are at least partially overlapped.

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

4. The expansion tube according to claim 1, characterized in that: An annular retaining ring is provided at the tail end of the tube body.

5. The expansion tube according to claim 1, characterized in that: A plurality of grooves are distributed axially on the outer side surface 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 tube body is provided with a fin plate, and the fin plate is arranged obliquely toward the rear end of the tube body.

7. An expansion bolt with expansion characteristics at both ends, comprising an expansion tube and a screw, characterized in that: The expansion tube is the expansion tube as claimed in any one of claims 1 to 6.

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