Anti-rotation expansion screw anchor bolt

Abstract

The utility model discloses an anti-rotation expansion screw anchor bolt which comprises an expansion sleeve, an expansion part, an expansion part and a fixing bolt, the expansion sleeve is provided with an expansion block arranged at the bottom of the expansion sleeve, the expansion part is arranged in the expansion sleeve, and the expansion part is provided with an expansion head abutting against the bottom of the expansion sleeve. An internal thread vertically penetrating through the expansion head is formed in the expansion head, the expansion part is arranged at the top of the expansion sleeve, the expansion part is provided with a sliding frame arranged at the top of the expansion sleeve in a sliding mode, a gasket is arranged at the top of the sliding frame, and a plurality of expansion rods are arranged on the side face of the sliding frame. According to the anchor bolt, the expansion part and the expansion part are arranged, the expansion head can be driven to axially displace through rotation of the fixing bolt, so that the expansion block is pushed to radially expand, meanwhile, the axial displacement of the fixing bolt extrudes the sliding frame, the expansion rod expands outwards, and the fixing effect of the anchor bolt is further enhanced; and the self-rotation condition of the expansion screw anchor bolt is prevented.

Description

Technical Field

[0001] This utility model relates to the field of screw anchor technology, specifically to an anti-rotation expansion screw anchor. Background Technology

[0002] An expansion bolt consists of an outer sleeve and an inner core. The sleeve has expansion tongues that are separated from each other by slits extending along the longitudinal direction of the expansion bolt. Expansion bolts are mainly used to fix objects to building walls. An expansion bolt generally consists of components such as a bolt body, expansion head, expansion sleeve, nut, washer, and gasket.

[0003] Currently, the expansion bolt sleeve structure commonly used in the market is relatively simple, typically consisting of only a single sleeve assembly. The expansion sleeve has a very smooth surface and a low roughness (Ra value), resulting in insufficient friction coefficient. During installation, when torque is applied for tightening, the static friction torque between the sleeve and the base hole wall is less than the tightening torque, causing axial relative displacement, i.e., rotation. This rotational displacement not only affects installation accuracy and leads to uneven distribution of preload, but may also reduce the overall load-bearing capacity of the anchoring system, affecting the safety and reliability of the structure. Utility Model Content

[0004] The purpose of this invention is to provide an anti-rotation expansion bolt anchor, addressing the issue raised in the background section where the commonly used expansion bolt sleeve structure is relatively simple, typically consisting of only a single sleeve assembly. The expansion sleeve has a very smooth surface and a low roughness (Ra value), resulting in insufficient friction coefficient. During installation, when torque is applied for tightening, the static friction torque between the sleeve and the base hole wall is less than the tightening torque, causing axial relative displacement, i.e., rotation.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an anti-rotation expansion screw anchor, comprising an expansion sleeve, an expansion portion, an expansion part, and a fixing bolt:

[0006] The expansion sleeve has an expansion block located at the bottom of the expansion sleeve, an expansion portion located inside the expansion sleeve, an expansion head abutting against the bottom of the expansion sleeve, an internal thread running vertically through the expansion head, an expansion portion located at the top of the expansion sleeve, a sliding frame slidably mounted on the top of the expansion sleeve, a gasket on the top of the sliding frame, and several expansion rods on the side of the sliding frame, a fixing bolt located inside the expansion sleeve, the fixing bolt running vertically through the entire expansion sleeve and threadedly connected to the expansion head, the fixing bolt rotating to drive the expansion head to move and cause the expansion block to open, the fixing bolt moving to squeeze the sliding frame to cause the expansion rods to open.

[0007] By adopting the above technical solution, the expansion head can be axially displaced by rotating the fixing bolt, thereby pushing the expansion block to expand radially. At the same time, the axial displacement of the fixing bolt squeezes the sliding frame, causing the expansion rod to expand outward, further enhancing the fixing effect of the anchor bolt and preventing the expansion screw anchor bolt from rotating on its own.

[0008] Preferably, the expansion sleeve also has a vertical cavity formed inside the expansion sleeve, the inner diameter of which is larger than the outer diameter of the fixing bolt.

[0009] By adopting the above technical solution, it can be ensured that the fixing bolt can rotate freely and move axially within the cavity, while reducing frictional resistance.

[0010] Preferably, the expansion sleeve also has anti-slip textures on the outside of the expansion block.

[0011] By adopting the above technical solution, the friction between the expansion block and the wall of the mounting hole can be increased, preventing the anchor bolt from sliding or loosening during installation or use.

[0012] Preferably, there are four expansion blocks, and the four expansion blocks are arranged in a central rotational symmetric structure around the center of the expansion sleeve.

[0013] By adopting the above technical solution, it is possible to ensure uniform stress during the expansion of the expansion block, thereby improving the stability and load-bearing capacity of the anchor bolt.

[0014] Preferably, the expansion portion also has four protrusions disposed on the side of the expansion head, with gaps between adjacent expansion blocks, and the protrusions are slidably connected to the expansion blocks by being embedded in the gaps.

[0015] By adopting the above technical solution, it can be used to push the expansion block outward when the expansion head moves axially, while limiting the radial displacement range of the expansion block.

[0016] Preferably, the expansion sleeve also has an inclined surface a disposed inside the expansion block, and an inclined surface b disposed at the top of the expansion head, the inclined surface a abutting against the inclined surface b.

[0017] By adopting the above technical solution, the radial expansion of the expansion block can be achieved through inclined plane cooperation, while ensuring the stability and controllability of the expansion process.

[0018] Preferably, the expansion sleeve also has a groove formed on the side of the expansion sleeve, into which the expansion rod is embedded.

[0019] By adopting the above technical solution, the radial displacement range of the expansion rod can be limited, while ensuring that the expansion rod can expand outward smoothly under the push of the sliding frame.

[0020] Preferably, there are six expansion rods, which are arranged in a central rotational symmetric structure around the center of the sliding frame.

[0021] By adopting the above technical solution, the expansion rod can be subjected to uniform force during the expansion process, thereby improving the overall stability and load-bearing capacity of the anchor bolt.

[0022] Compared with the prior art, the beneficial effects of this utility model are: by providing an expansion part and an expansion part, the expansion head can be driven to move axially by rotating the fixing bolt, thereby pushing the expansion block to expand radially. At the same time, the axial displacement of the fixing bolt squeezes the sliding frame, causing the expansion rod to expand outward, further enhancing the fixing effect of the anchor bolt. By providing two expansion points in different positions, the stability of the connection with the wall is improved, and the expansion screw anchor bolt is prevented from rotating on its own. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this application;

[0024] Figure 2 This is a schematic diagram of the overall structure of this application;

[0025] Figure 3 This is a schematic diagram of the overall cross-sectional structure of this application;

[0026] Figure 4 This is a schematic diagram of the expansion sleeve structure of this application;

[0027] Figure 5 This is a schematic diagram of the expanded head structure of this application;

[0028] Figure 6 This is a schematic diagram of the sliding frame structure of this application.

[0029] In the diagram: 1. Expansion sleeve; 101. Cavity; 102. Expansion block; 103. Anti-slip texture; 104. Inclined surface a; 105. Slide groove; 2. Expansion part; 201. Expansion head; 202. Inclined surface b; 203. Protrusion; 204. Internal thread; 3. Expansion part; 301. Sliding frame; 302. Expansion rod; 303. Gasket; 4. Fixing bolt. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Example 1

[0032] Please see Figure 1 , Figure 2 and Figure 3 This embodiment provides a technical solution: an anti-rotation expansion bolt anchor, comprising an expansion sleeve 1, an expansion portion 2, an expansion portion 3, and a fixing bolt 4.

[0033] The expansion sleeve 1 has an expansion block 102 located at its bottom. A vertical cavity 101 is formed inside the expansion sleeve 1, with an inner diameter larger than the outer diameter of the fixing bolt 4. This ensures that the fixing bolt 4 can rotate freely and move axially within the cavity 101, while reducing frictional resistance. Anti-slip textures 103 are provided on the outer side of the expansion block 102 to increase the friction between the expansion block 102 and the mounting hole wall, preventing the anchor bolt from sliding or loosening during installation or use. Four expansion blocks 102 are provided, arranged in a centrally rotationally symmetrical structure around the center of the expansion sleeve 1. This ensures uniform force distribution during expansion, improving the stability and load-bearing capacity of the anchor bolt.

[0034] An expansion section 2 is disposed inside the expansion sleeve 1. The expansion section 2 has an expansion head 201 that abuts against the bottom of the expansion sleeve 1. An internal thread 204 is formed inside the expansion head 201, which penetrates vertically. An expansion section 3 is disposed at the top of the expansion sleeve 1. The expansion section 3 has a sliding frame 301 that is slidably disposed at the top of the expansion sleeve 1. A gasket 303 is disposed at the top of the sliding frame 301. Several expansion rods 302 are disposed on the side of the sliding frame 301. A fixing bolt 4 is disposed inside the expansion sleeve 1 and penetrates vertically throughout the entire expansion sleeve 1. The expansion sleeve 1 is threadedly connected to the expansion head 201. The fixing bolt 4 is rotated to drive the expansion head 201 to move so that the expansion block 102 opens. The displacement of the fixing bolt 4 squeezes the sliding frame 301 to open the expansion rod 302. The rotation of the fixing bolt 4 can drive the expansion head 201 to move axially, thereby pushing the expansion block 102 to expand radially. At the same time, the axial displacement of the fixing bolt 4 squeezes the sliding frame 301, causing the expansion rod 302 to expand outward, further enhancing the fixing effect of the anchor bolt and preventing the expansion screw anchor bolt from rotating on its own.

[0035] Example 2

[0036] Please see Figure 4 , Figure 5 and Figure 6 This embodiment provides a technical solution: an anti-rotation expansion bolt anchor, comprising an expansion sleeve 1, an expansion portion 2, and an expansion head 201.

[0037] Four protrusions 203 are integrally provided on the side of the expansion head 201. There is a gap between adjacent expansion blocks 102. The protrusions 203 are inserted into the gap and slidably connected with the expansion blocks 102. They can be used to push the expansion blocks 102 outward when the expansion head 201 moves axially, while limiting the radial displacement range of the expansion blocks 102.

[0038] An inclined surface a104 is provided on the inner side of the expansion block 102, and an inclined surface b202 is provided on the top of the expansion head 201. The inclined surface a104 abuts against the inclined surface b202, and the radial expansion of the expansion block 102 can be achieved through the cooperation of the inclined surfaces, while ensuring the stability and controllability of the expansion process.

[0039] Example 3

[0040] Please see Figure 4 , Figure 5 and Figure 6 This embodiment provides a technical solution: an anti-rotation expansion bolt anchor, comprising an expansion sleeve 1, an expansion portion 3, and an expansion rod 302.

[0041] A groove 105 is provided on the side of the expansion sleeve 1. The expansion rod 302 is embedded in the groove 105, which can be used to limit the radial displacement range of the expansion rod 302, while ensuring that the expansion rod 302 can expand outward smoothly under the push of the sliding frame 301.

[0042] There are six expansion rods 302, which are arranged in a central rotational symmetry structure around the center of the sliding frame 301. This structure ensures that the expansion rods 302 are subjected to uniform force during expansion, thereby improving the overall stability and load-bearing capacity of the anchor bolt.

[0043] Working principle: First, during use, the anchor bolt is inserted into the pre-made installation hole. At this time, the expansion block 102 and expansion rod 302 are in an unexpanded state, and the anchor bolt can be freely adjusted. Then, by rotating the fixing bolt 4, the expansion head 201 is moved upward along the axis. The inclined surface b202 at the top of the expansion head 201 abuts against the inclined surface a104 on the inner side of the expansion block 102, so that the expansion head 201 can push the expansion block 102 outward. The anti-slip texture 103 on the outer side of the expansion block 102 generates high friction with the wall of the installation hole, preventing the anchor bolt from sliding or loosening during installation or use. At the same time, the symmetrical distribution design of the expansion block 102 ensures uniform radial force, improving the load-bearing capacity and stability of the anchor bolt. As the fixing bolt 4 moves downward, it will push the washer 303, which in turn will push the sliding frame 301 to move downward along the top of the expansion sleeve 1. The expansion rod 302 on the side of the sliding frame 301 is embedded in the groove 105 on the side of the expansion sleeve 1. Under the push of the sliding frame 301, the expansion rod 302 expands outward along the groove 105, further increasing the contact area between the anchor bolt and the mounting hole wall. The dual expansion mechanism of the expansion block 102 and the expansion rod 302 significantly improves the overall fixing effect of the anchor bolt. The expansion block 102 provides the main radial support force, while the expansion rod 302 enhances the anchor bolt's pull-out resistance and torsional resistance through multi-point contact, effectively preventing the anchor bolt from rotating or loosening under dynamic loads.

[0044] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0045] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An anti-rotation expansion bolt anchor, characterized in that, include: An expansion sleeve having an expansion block disposed at the bottom of the expansion sleeve; An expansion section is provided inside the expansion sleeve. The expansion section has an expansion head that abuts against the bottom of the expansion sleeve. The expansion head has an internal thread that runs vertically through the expansion head. An expansion section is provided on the top of an expansion sleeve. The expansion section has a sliding frame that is slidably disposed on the top of the expansion sleeve. A gasket is provided on the top of the sliding frame, and several expansion rods are provided on the side of the sliding frame. A fixing bolt is located inside the expansion sleeve. The fixing bolt extends vertically through the entire expansion sleeve and is threadedly connected to the expansion head. The fixing bolt rotates to drive the expansion head to displace, causing the expansion block to open. The displacement of the fixing bolt compresses the sliding frame, causing the expansion rod to open.

2. The anti-rotation expansion bolt anchor according to claim 1, characterized in that: The expansion sleeve also has a vertical cavity inside the expansion sleeve, the inner diameter of which is larger than the outer diameter of the fixing bolt.

3. The anti-rotation expansion bolt anchor according to claim 1, characterized in that: The expansion sleeve also features anti-slip textures on the outside of the expansion block.

4. The anti-rotation expansion bolt anchor according to claim 1, characterized in that: There are four expansion blocks, which are arranged in a central rotational symmetric structure around the center of the expansion sleeve.

5. The anti-rotation expansion bolt anchor according to claim 4, characterized in that: The expansion section also has four protrusions on the side of the expansion head, with gaps between adjacent expansion blocks, and the protrusions are slidably connected to the expansion blocks by being embedded in the gaps.

6. The anti-rotation expansion bolt anchor according to claim 1, characterized in that: The expansion sleeve also has an inclined surface a disposed inside the expansion block, and an inclined surface b disposed at the top of the expansion head, the inclined surface a abutting against the inclined surface b.

7. The anti-rotation expansion bolt anchor according to claim 1, characterized in that: The expansion sleeve also has a groove on the side of the expansion sleeve, into which the expansion rod is embedded.

8. The anti-rotation expansion bolt anchor according to claim 7, characterized in that: There are six expansion rods, which are arranged in a central rotational symmetric structure around the center of the sliding frame.

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