An expansion screw

Abstract

The utility model relates to the technical field of expansion screws, especially to an expansion screw, which comprises an antiskid sleeve, mounting seats are arranged on both sides of the outer end of the antiskid sleeve, the pull ring is pulled to drive the movable rod to move outward, the compression spring is compressed by the limiting plate at the same time, the clamping block exits the limiting slot of the limiting column and moves to the inner side of the cavity, the radial constraint on the limiting column is released, the pull ring is loosened during installation, the compression spring releases the elastic potential energy to push the movable rod to reset, the clamping block is clamped into the limiting slot again to realize the quick locking of the mounting seat and the limiting column, the screw body can be recycled after installation, when the screw body is rotated to be connected to the antiskid sleeve, the end fixing ring of the screw body pushes the limiting ring, the limiting ring is self-adapted and attached through the elastic effect of the telescopic rod and the reset spring, the sliding block slides along the guide rod to ensure the smooth movement of the limiting ring, the axial displacement of the screw body is limited, the screw body is stably connected to the inside of the antiskid sleeve, and the practicability is better.

Description

Technical Field

[0001] This utility model relates to the technical field of expansion screws, and in particular to an expansion screw. Background Technology

[0002] Expansion bolts are fasteners widely used in construction, decoration, and mechanical installation. They achieve a stable anchoring effect through a unique mechanical structure. The core principle is to use the friction and mechanical interlocking force generated by material deformation to fix objects to hard substrates such as concrete and brick walls. Specifically, an expansion bolt consists of a screw and an anti-slip sleeve. After the anti-slip sleeve is placed on the inner wall of the hole at the installation position, the screw is turned into the anti-slip sleeve, which expands the anti-slip sleeve, thereby improving the stability of the connection between the objects.

[0003] However, because traditional screws are relatively small, during installation, workers need to hold the screw and anti-slip sleeve to position it, and then use a screwdriver or electric drill to tighten the screw. During this process, the screw is prone to slipping or being scratched while holding it, which reduces the stability and safety of the expansion screw installation process and makes it less practical, thus having certain drawbacks.

[0004] Therefore, in order to solve the above problems, this utility model provides an expansion screw. Utility Model Content

[0005] The purpose of this invention is to provide an expansion screw to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an expansion screw, comprising an anti-slip sleeve, with mounting seats on both sides of the outer end of the anti-slip sleeve, a limiting hole being formed at the outer end of the mounting seat, a limiting post being installed on the outer side of the mounting seat and inside the limiting hole, a guide rod being installed at the outer end of the mounting seat away from the limiting hole, a slider being installed on the outer ring surface of the guide rod, a telescopic rod being installed at the outer end of the slider, a return spring being installed on the outer ring surface of the telescopic rod, a limiting ring being installed at one end of the telescopic rod, a screw body being disposed on the outer side of the anti-slip sleeve and between the two mounting seats, and a fixing ring being installed on the outer ring surface of the end of the screw body and between the two limiting rings.

[0007] Preferably, the outer ring surface dimension of the limiting post is adapted to the inner sidewall dimension of the limiting hole, and the mounting seat is tightly attached to the outside of the anti-slip sleeve after being connected to the outside of the limiting post through the limiting hole.

[0008] Preferably, the mounting base has a cavity at one end, a movable rod is installed between the inner sidewalls of the cavity, a compression spring is installed on the outer ring surface of the movable rod, a limit plate is installed on the outer ring surface of the movable rod and in close contact with the compression spring, a pull ring is installed at one end of the movable rod extending to the outside of the mounting base, and a locking block is installed at the end of the movable rod away from the pull ring and inside the limit hole.

[0009] Preferably, a limiting groove is provided at one end of the limiting post, and the locking block can be engaged into the limiting groove when it moves with the movable rod to the inside of the limiting hole.

[0010] Preferably, the outer ring surface of the guide rod is slidably connected to the interior of the slider, and a limit block is installed at one end of the guide rod.

[0011] Preferably, the inner wall of the limiting ring is provided with a groove, and when the two limiting rings are fitted together, the inner groove is located exactly outside the fixing ring.

[0012] In summary, this utility model has the following beneficial technical effects: This type of expansion screw involves pulling a pull ring to move a movable rod outward. The compression spring is compressed by the limiting plate, while the locking block exits the limiting groove of the limiting post and moves to the inside of the cavity, releasing the radial constraint on the limiting post. During installation, releasing the pull ring releases the elastic potential energy of the compression spring, pushing the movable rod back to its original position, allowing the locking block to re-engage in the limiting groove, achieving quick locking between the mounting base and the limiting post. It is easy to install and disassemble, facilitating the recycling of the screw body after installation. When the screw body rotates into the anti-slip sleeve, its end fixing ring pushes the limiting ring. The limiting ring achieves adaptive engagement through the elastic action of the telescopic rod and the return spring. Simultaneously, the slider slides along the guide rod to ensure smooth movement of the limiting ring. Finally, the grooves of the two limiting rings and the fixing ring form a mechanical engagement, restricting the axial displacement of the screw body and ensuring stable engagement of the screw body into the anti-slip sleeve. This design offers convenient operation and superior practicality. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a utility model Figure 1 Schematic diagram on the right side of the structure; Figure 3 This is a utility model Figure 2 Schematic diagram of structural layering; Figure 4 This is a utility model Figure 3 Schematic diagram of the internal structure of the mounting base.

[0014] Explanation of reference numerals in the attached drawings: 1. Anti-slip sleeve; 2. Mounting base; 201. Limiting hole; 202. Cavity; 3. Limiting post; 301. Limiting groove; 4. Guide rod; 5. Slider; 6. Telescopic rod; 7. Return spring; 8. Limiting ring; 9. Screw body; 10. Fixing ring; 11. Movable rod; 12. Compression spring; 13. Limiting plate; 14. Pull ring; 15. Locking block; 16. Limiting block. Detailed Implementation

[0015] The following is in conjunction with the appendix Figure 1 - Figure 4 The present invention will be described in further detail below.

[0016] An expansion screw, see reference Figure 1 - Figure 4 The system includes an anti-slip sleeve 1, with mounting bases 2 on both sides of the outer end of the anti-slip sleeve 1. A limiting hole 201 is formed at the outer end of the mounting base 2. A limiting post 3 is installed on the outer side of the mounting base 2 and inside the limiting hole 201. A guide rod 4 is installed at the outer end of the mounting base 2 away from the limiting hole 201. A slider 5 is installed on the outer ring surface of the guide rod 4. A telescopic rod 6 is installed at the outer end of the slider 5. A return spring 7 is installed on the outer ring surface of the telescopic rod 6. A limiting ring 8 is installed at one end of the telescopic rod 6. A screw body 9 is provided on the outer side of the anti-slip sleeve 1 and between the two mounting bases 2. A fixing ring 10 is installed on the outer ring surface of the end of the screw body 9 and between the two limiting rings 8.

[0017] Reference Figure 1 - Figure 3 The outer ring size of the limiting post 3 is adapted to the inner wall size of the limiting hole 201, and the mounting seat 2 is connected to the outside of the limiting post 3 through the limiting hole 201 and then closely adheres to the outside of the anti-slip sleeve 1, which makes it easy to fix the mounting seat 2 to the outside of the anti-slip sleeve 1 later.

[0018] Reference Figure 1 - Figure 4A cavity 202 is provided at one end of the mounting base 2. A movable rod 11 is installed between the inner walls of the cavity 202. A compression spring 12 is installed on the outer ring surface of the movable rod 11. A limit plate 13 is installed on the outer ring surface of the movable rod 11 and in close contact with the compression spring 12. A pull ring 14 is installed at one end of the movable rod 11 that extends to the outside of the mounting base 2. A locking block 15 is installed at the end of the movable rod 11 away from the pull ring 14 and inside the limit hole 201. A limit groove 301 is provided at the outer end of the limit post 3. When the locking block 15 moves with the movable rod 11 into the limit hole 201, it can be engaged into the limit groove 301. When it is necessary to disassemble the mounting base 2, pulling the pull ring 14 moves the movable rod 11 outward. The compression spring 12 is compressed by the limit plate 13, and the locking block 15 is disengaged from the limit. The limiting groove 301 of the column 3 is moved to the inside of the cavity 202, releasing the radial constraint on the limiting column 3. During installation, the pull ring 14 is loosened, the compression spring 12 releases elastic potential energy to push the movable rod 11 to reset, so that the locking block 15 is re-locked into the limiting groove 301, realizing the quick locking of the mounting base 2 and the limiting column 3. It is convenient to disassemble and assemble, and it is easy to recycle the screw body 9 after installation. The inner wall of the limiting ring 8 is provided with a groove. When the two limiting rings 8 are in contact, their inner grooves are located on the outside of the fixed ring 10. By moving the two limiting rings 8 away from each other, the telescopic rod 6 and the return spring 7 will be squeezed. Then, the two limiting rings 8 are moved to the outside of the fixed ring 10 and the limiting rings 8 are released. The restriction of the return spring 7 is released, and the two limiting rings 8 can be driven to reset and connect to the outside of the fixed ring 10 respectively.

[0019] Reference Figure 1 - Figure 3 The outer ring surface of the guide rod 4 is slidably connected to the inside of the slider 5. A limit block 16 is installed at one end of the guide rod 4. The guide rod 4 provides a linear motion trajectory for the slider 5. When the screw body 9 rotates into the anti-slip sleeve 1, its end fixing ring 10 pushes the limit ring 8. The limit ring 8 achieves adaptive fitting through the elastic action of the telescopic rod 6 and the return spring 7. At the same time, the slider 5 slides along the guide rod 4 to ensure the smooth movement of the limit ring 8. Finally, the grooves of the two limit rings 8 and the fixing ring 10 form a mechanical engagement, restricting the axial displacement of the screw body 9 and ensuring that the screw body 9 is stably connected into the inside of the anti-slip sleeve 1.

[0020] The implementation principle of an expansion screw according to this utility model embodiment is as follows: When using the expansion screw, the anti-slip sleeve 1 is pre-embedded in the mounting hole during installation. The mounting base 2 is connected to the outside of the limiting post 3 through the limiting hole 201 and is tightly attached to the outside of the anti-slip sleeve 1, which facilitates the subsequent fixing of the mounting base 2 to the outside of the anti-slip sleeve 1. When it is necessary to install or remove the mounting base 2, the pull ring 14 is pulled to drive the movable rod 11 to move outward. The compression spring 12 is compressed by the limiting plate 13, and the locking block 15 exits the limiting groove 301 of the limiting post 3 and moves to the inside of the cavity 202, releasing the radial constraint on the limiting post 3. During installation, the pull ring 14 is released, the compression spring 12 releases elastic potential energy to push the movable rod 11 to reset, so that the locking block 15 re-engages into the limiting groove 301, realizing the quick locking of the mounting base 2 and the limiting post 3. The installation and removal are convenient, and it is easy to clean the screw body 9. After installation, the screw is recycled. By moving the two limiting rings 8 away from each other, the telescopic rod 6 and the return spring 7 are squeezed. Then, the two limiting rings 8 are moved to the outside of the fixed ring 10 and released. The restriction of the return spring 7 is released, and the two limiting rings 8 can be driven to return to the outside of the fixed ring 10. The guide rod 4 provides a linear motion trajectory for the slider 5. When the screw body 9 rotates into the anti-slip sleeve 1, its end fixed ring 10 pushes the limiting ring 8. The limiting ring 8 achieves adaptive fitting through the elastic action of the telescopic rod 6 and the return spring 7. At the same time, the slider 5 slides along the guide rod 4 to ensure the smooth movement of the limiting ring 8. Finally, the grooves of the two limiting rings 8 form a mechanical engagement with the fixed ring 10, restricting the axial displacement of the screw body 9 and ensuring that the screw body 9 is stably connected to the inside of the anti-slip sleeve 1. The operation is convenient and the practicality is better.

[0021] Finally, the following points should be noted: First, in the description of this utility model, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be interpreted broadly, and can be mechanical connection or electrical connection, or internal connection between two components, or direct connection. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationship. When the absolute position of the described object changes, the relative positional relationship may change. Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other. Finally: 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, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

[0022] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. An expansion screw, comprising an anti-slip sleeve (1), characterized in that: Mounting seats (2) are provided on both sides of the outer end of the anti-slip sleeve (1). A limiting hole (201) is opened at the outer end of the mounting seat (2). A limiting post (3) is installed on the outer side of the mounting seat (2) and inside the limiting hole (201). A guide rod (4) is installed on the outer end of the mounting seat (2) away from the limiting hole (201). A slider (5) is installed on the outer ring surface of the guide rod (4). A telescopic rod (6) is installed on the outer end of the slider (5). A return spring (7) is installed on the outer ring surface of the telescopic rod (6). A limiting ring (8) is installed on one end of the telescopic rod (6). A screw body (9) is provided on the outer side of the anti-slip sleeve (1) and between the two mounting seats (2). A fixing ring (10) is installed on the outer ring surface of the end of the screw body (9) and between the two limiting rings (8).

2. An expansion screw according to claim 1, characterized in that: The outer ring size of the limiting post (3) is adapted to the inner wall size of the limiting hole (201), and the mounting seat (2) is connected to the outside of the limiting post (3) through the limiting hole (201) and then closely attached to the outside of the anti-slip sleeve (1).

3. An expansion screw according to claim 1, characterized in that: A cavity (202) is provided at one end of the mounting base (2). A movable rod (11) is installed between the inner walls of the cavity (202). A compression spring (12) is installed on the outer ring surface of the movable rod (11). A limiting plate (13) is installed on the outer ring surface of the movable rod (11) and close to the compression spring (12). A pull ring (14) is installed at one end of the movable rod (11) after it extends to the outside of the mounting base (2). A locking block (15) is installed at the end of the movable rod (11) away from the pull ring (14) and inside the limiting hole (201).

4. An expansion screw according to claim 3, characterized in that: The limiting post (3) has a limiting groove (301) at one end. When the locking block (15) moves with the movable rod (11) to the inside of the limiting hole (201), it can be connected to the inside of the limiting groove (301).

5. An expansion screw according to claim 1, characterized in that: The outer ring surface of the guide rod (4) is slidably connected to the inside of the slider (5), and a limit block (16) is installed at one end of the guide rod (4).

6. An expansion screw according to claim 1, characterized in that: The inner wall of the limiting ring (8) is provided with a groove, and when the two limiting rings (8) are fitted together, their inner grooves are located on the outside of the fixing ring (10).

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