Expansion pipe and expansion bolt

Abstract

The utility model relates to a bolt, and particularly discloses an expansion pipe and an expansion bolt. The expansion pipe comprises a pipe body, and an expansion channel is arranged in the pipe body. The pipe body sequentially comprises a head section, a middle section and a tail section in the axial direction, the expansion channel comprises a first section and a second section, and the inner diameter of the first section is smaller than that of the second section; the middle subsection is provided with at least two main expansion grooves extending in the axial direction, a deformation part is arranged between every two adjacent main expansion grooves in the circumferential direction of the pipe body, the outer side face of each deformation part is provided with an auxiliary expansion groove extending in the axial direction, and the auxiliary expansion grooves are not communicated with the expansion channel; convex ribs are arranged on the inner wall of the deformation part, and the convex ribs and the auxiliary expansion grooves are arranged in a staggered mode in the circumferential direction. The expansion pipe can perform expansion deformation in different forms aiming at the base parts with different thicknesses, so that the expansion pipe is well suitable for the base parts with different thicknesses, and the connection reliability is ensured.

Description

Technical Field

[0001] This utility model relates to a bolt, specifically to an expansion tube and an expansion bolt. Background Technology

[0002] Expansion bolts are threaded fasteners used to connect equipment to bases such as walls, floors, and boards. Compared to conventional bolts, expansion bolts include an expansion tube. During use, the bolt is screwed into the expansion tube by rotating it. The expansion tube expands and deforms, tightening with the opening in the base, thus providing excellent connection reliability.

[0003] Expansion bolts typically have a large length-to-diameter ratio. To ensure reliable connections, a deep pre-drilled hole is usually drilled in the base to accommodate the bolt. However, for thinner bases, such as hollow bricks or gypsum board, even with through holes, the effective contact length between the base and the expansion bolt is limited. In particular, conventional expansion bolts usually expand at the head, while their expansion deformation capacity at the tail is weak. Using conventional expansion bolts carries the risk of insufficient connection strength, making it impossible to guarantee reliable connections. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide an expansion tube and expansion bolt that can expand and deform in different forms for bases of different thicknesses, adapt well to bases of various thicknesses, and ensure the reliability of the connection.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an expansion tube, comprising a tube body, wherein an expansion channel is provided within the tube body; the tube body comprises, along the axial direction, a head segment, a middle segment, and a tail segment; the expansion channel comprises a first segment and a second segment, wherein the inner diameter of the first segment is smaller than the inner diameter of the second segment; wherein the first segment corresponds to the head segment, and the second segment corresponds to the middle segment and the tail segment;

[0006] The intermediate section is provided with at least two axially extending main expansion grooves, which penetrate the side wall of the pipe body; in the circumferential direction of the pipe body, there is a deformation section between two adjacent main expansion grooves, and the outer side of the deformation section is provided with an axially extending auxiliary expansion groove, which is not connected to the expansion channel; the inner wall of the deformation section is provided with a rib, which is offset from the auxiliary expansion groove in the circumferential direction.

[0007] When in use, the expansion tube is inserted into the base hole with the head facing inward. The diameter of the matching screw is larger than the diameter of the first section but smaller than the diameter of the second section. When the screw is screwed into the second section of the expansion channel, the screw only engages with the rib. When screwed into the second section, the screw can engage with the first section.

[0008] When the base thickness is large, after the expansion tube is inserted into the base hole, the middle section is at least mostly located inside the base hole. When the screw is screwed into the middle section, the screw engages with the raised rib and pushes the deformed part outward. The deformed part is pressed against the hole wall of the base hole, thus achieving the connection between the expansion tube and the base. When the screw is screwed into the head section, the head section tends to move towards the tail section, but due to the constraint of the base hole, the head section cannot move.

[0009] When the base thickness is small, the base hole is a through hole. After the expansion tube is inserted into the base hole, most of the middle section passes through the base hole and extends out. When the screw is screwed into the middle section, the deformable part expands outward. However, since there is no external constraint on the middle section, the expansion tube cannot be reliably connected to the base. As the screw continues to be screwed into the head section, the head section moves towards the tail section, the deformable part expands outward, the auxiliary expansion groove cracks, and the deformable part eventually winds into an end, preventing the expansion tube from exiting the base, thus achieving a reliable connection between the expansion tube and the base.

[0010] The expansion tube of this application can undergo different forms of expansion deformation for bases of different thicknesses, adapting well to bases of various thicknesses and ensuring the reliability of the connection.

[0011] Preferably, the expansion channel is provided to extend through the pipe body axially.

[0012] Preferably, the top of the rib is provided with an engagement groove, which extends radially along the tube body. The engagement groove guides the screw to engage and screw into the rib, making the screw insertion smoother and the outward squeezing effect on the rib more pronounced.

[0013] Preferably, the auxiliary expansion groove has a V-shaped cross-section, which allows it to crack more easily when used in bases with small thicknesses.

[0014] Preferably, the outer surface of the intermediate segment has several grooves distributed along the axial direction, and the grooves extend circumferentially around the axis of the tube body. The grooves increase the reliability of the contact between the intermediate segment and the base hole.

[0015] Preferably, there are two main expansion grooves, and the two main expansion grooves are symmetrically arranged with respect to the axis of the tube body; each of the deformable parts is provided with two auxiliary expansion grooves, and the convex ribs in the circumferential direction are located between the two auxiliary expansion grooves.

[0016] Preferably, the sidewall of the main expansion groove is provided with guide notches, which are positioned opposite each other on both sides of the main expansion groove. The guide notches can reduce the stiffness of the deformable part and guide its outward expansion.

[0017] Preferably, the outer surface of the segmented tail end of the tube is provided with several ribs, which extend along the axial direction of the tube and are evenly distributed in a ring around the axis of the tube. The ribs can fit well with the base, preventing the expansion tube from rotating during screw insertion and ensuring smooth connection operation.

[0018] Preferably, the tail end of the tube is provided with annular retaining rings in sections, which can provide axial positioning for the insertion of the tube.

[0019] An expansion bolt includes an expansion tube and a screw, wherein the expansion tube is an expansion tube as described above. Attached Figure Description

[0020] Figure 1 This is a front view of the expansion tube and expansion bolt in this embodiment;

[0021] Figure 2 This is a structural view of the expansion tube and expansion bolt from a first-person perspective in this embodiment;

[0022] Figure 3 This is a structural view of the expansion tube and expansion bolt from a second perspective in this embodiment;

[0023] Figure 4 This is an axial sectional view of the expansion tube and expansion bolt in this embodiment;

[0024] Figure 5 This is a radial sectional view of the expansion tube and expansion bolt in this embodiment. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. Example

[0026] like Figures 1-4 As shown, an expansion tube includes a tube body with an expansion channel 5 inside. Specifically, the expansion channel 5 extends axially through the tube body. The tube body sequentially includes a head segment 8, a middle segment 9, and a tail segment 10 along the axial direction. The outer surface of the middle segment 9 has a plurality of grooves 3 distributed axially, and the grooves 3 extend circumferentially around the axis of the tube body. The grooves 3 increase the reliability of the contact between the middle segment 9 and the base hole. The expansion channel 5 includes a first segment 13 and a second segment 12, where the inner diameter of the first segment 13 is smaller than the inner diameter of the second segment 12. The first segment 13 corresponds to the head segment 8, and the second segment 12 corresponds to the middle segment 9 and the tail segment 10.

[0027] Furthermore, such as Figure 2and Figure 3 As shown, the outer surface of the segmented tail end of the tube is provided with several ribs 4. The ribs 4 extend along the axial direction of the tube and are evenly distributed in a ring around the axis of the tube. The ribs 4 can fit well with the base, preventing the expansion tube from rotating during screw insertion and ensuring smooth connection operation. The segmented tail end of the tube is provided with an annular retaining ring 6, which can provide axial positioning for the insertion of the tube.

[0028] like Figure 2 and Figure 3 As shown, the intermediate segment 9 is provided with at least two axially extending main expansion grooves 1, which penetrate the side wall of the pipe body. Specifically, the side wall of the main expansion groove 1 is provided with guide notches 11, which are positioned opposite each other on both sides of the main expansion groove 1. The guide notches 11 can reduce the stiffness of the deformable part and guide the outward expansion of the deformable part.

[0029] like Figure 2 and Figure 3 As shown, in the circumferential direction of the tube body, there is a deformation section between two adjacent main expansion grooves 1. The outer side of the deformation section is provided with an auxiliary expansion groove 2 extending axially. The auxiliary expansion groove 2 is not connected to the expansion channel 5. Specifically, the cross-section of the auxiliary expansion groove 2 is V-shaped, which allows the auxiliary expansion groove 2 to crack more easily when used for bases with small thicknesses.

[0030] like Figure 4 and Figure 5 As shown, the inner wall of the deformable part is provided with a raised rib 7, which is offset from the auxiliary expansion groove 2 in the circumferential direction. Specifically, there are two main expansion grooves 1, which are symmetrically arranged with respect to the axis of the tube body. Each deformable part is provided with two auxiliary expansion grooves 2, and the raised rib 7 is located between the two auxiliary expansion grooves 2 in the circumferential direction.

[0031] like Figure 4 and Figure 5 As shown, the top of the rib 7 is provided with an engagement groove 71, which extends radially along the tube body. The engagement groove 71 guides the screw to engage and screw into the rib 7, making the screw insertion smoother and the outward squeezing effect on the rib 7 more obvious.

[0032] When in use, the expansion tube is inserted into the base hole of the base with the head facing inward. The diameter of the matching screw is larger than the diameter of the first segment 13 and smaller than the diameter of the second segment 12. When the screw is screwed into the second segment 12 of the expansion channel 5, the screw only engages with the rib 7. When screwed into the second segment 12, the screw can engage with the first segment 13.

[0033] When the base thickness is large, after the expansion tube is inserted into the base hole, the middle segment 9 is at least mostly located inside the base hole. When the screw is screwed into the middle segment 9, the screw engages with the rib 7 and pushes the deformed part outward. The deformed part is pressed against the hole wall of the base hole, thus achieving the connection between the expansion tube and the base. When the screw is screwed into the head segment 8, the head segment 8 tends to move towards the tail segment 10, but due to the constraint of the base hole, the head segment 8 cannot move.

[0034] When the base thickness is small, the base hole is a through hole. After the expansion tube is inserted into the base hole, most of the middle segment 9 passes through the base hole and extends out. When the screw is screwed into the middle segment 9, the deformable part expands outward. However, since there is no external constraint on the middle segment 9, the expansion tube cannot be reliably connected to the base. When the screw continues to be screwed into the head segment 8, the head segment 8 moves towards the tail segment 10 as the screw is screwed in. The deformable part expands outward, the auxiliary expansion groove 2 cracks, and the deformable part eventually winds into an end, preventing the expansion tube from exiting the base, thereby achieving a reliable connection between the expansion tube and the base.

[0035] The expansion tube of this application can undergo different forms of expansion deformation for bases of different thicknesses, adapting well to bases of various thicknesses and ensuring the reliability of the connection.

[0036] An expansion bolt includes an expansion tube and a screw, wherein the expansion tube is an expansion tube as described above.

[0037] In summary, the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An expansion tube, comprising a tube body, wherein an expansion channel is provided within the tube body; characterized in that: The tube body comprises, along the axial direction, a head section, a middle section, and a tail section. The expansion channel comprises a first section and a second section, wherein the inner diameter of the first section is smaller than the inner diameter of the second section. The first section corresponds to the head section, and the second section corresponds to the middle section and the tail section. The intermediate section is provided with at least two axially extending main expansion grooves, which penetrate the side wall of the pipe body; in the circumferential direction of the pipe body, there is a deformation section between two adjacent main expansion grooves, and the outer side of the deformation section is provided with an axially extending auxiliary expansion groove, which is not connected to the expansion channel; the inner wall of the deformation section is provided with a rib, which is offset from the auxiliary expansion groove in the circumferential direction.

2. The expansion tube according to claim 1, characterized in that: The expansion channel is arranged axially through the pipe body.

3. The expansion tube according to claim 1, characterized in that: The top of the rib is provided with an engagement groove, which extends radially along the tube body.

4. The expansion tube according to claim 3, characterized in that: The cross-section of the auxiliary expansion groove is V-shaped.

5. The expansion tube according to claim 1, characterized in that: The outer surface of the middle section has several grooves distributed along the axial direction, and the grooves extend circumferentially around the axis of the tube.

6. The expansion tube according to claim 1, characterized in that: There are two main expansion grooves, and the two main expansion grooves are symmetrically arranged with respect to the axis of the tube body; each of the deformable parts is provided with two auxiliary expansion grooves, and the convex ribs in the circumferential direction are located between the two auxiliary expansion grooves.

7. The expansion tube according to claim 1, characterized in that: The main expansion groove has guide notches on its sidewalls, and the guide notches are positioned opposite each other on both sides of the main expansion groove.

8. The expansion tube according to claim 1, characterized in that: The outer side of the segment at the tail end of the tube is provided with several ribs, which extend along the axial direction of the tube and are evenly distributed in a ring around the axis of the tube.

9. The expansion tube according to claim 1, characterized in that: The tail end of the tube is provided with annular retaining rings in sections.

10. An expansion bolt, comprising an expansion tube and a screw, characterized in that: The expansion tube therein is the expansion tube as described in any one of claims 1-9.

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