Screw with anti-theft and locking functions

Abstract

The utility model provides a screw with anti-theft and locking functions, which belongs to the technical field of screws and comprises a bolt and a nut. The nut is in threaded fit with the bolt; the nut comprises a nut body; the nut body is circular, and an annular mounting groove is formed in the circular wall of the nut body along the circumference of the nut body. A regular polygon columnar connecting matching body is fixedly arranged in the mounting groove; the connecting matching body is made of a soft elastic material, and the interior of the connecting matching body is hollow to form an accommodating cavity; the containing cavity is filled with magnetorheological fluid. The diameter of the inscribed circle of the regular polygon is larger than or equal to the diameter of the nut body. A regular polygonal annular embedding body is arranged outside the connecting matching body in a matching manner; the annular embedded body is a magnet. The hardness of the nut is changed by controlling the magnetorheological fluid, so that the screw has an anti-theft function.

Description

Technical Field

[0001] This invention relates to the field of screw technology, and specifically to a screw with anti-theft and locking functions. Background Technology

[0002] Screws are common fasteners widely used in various mechanical equipment, building structures, furniture manufacturing, and other fields. A screw typically consists of two parts: a head and a threaded shank. The head comes in different shapes, such as round, square, and hexagonal, to suit different tightening tools and usage scenarios. The threaded shank has threads that engage with a nut or a component with internal threads to achieve a fastening connection. Currently, most screw nuts are polygonal in structure to facilitate use with tools such as wrenches. After tightening, the nut is often exposed outside the fastener for easy disassembly, but this exposed nut also makes the screw easily detachable, resulting in poor anti-theft performance. Therefore, this invention provides a screw with both anti-theft and locking functions. Summary of the Invention

[0003] The purpose of this invention is to provide a screw with anti-theft and locking functions.

[0004] To solve the above-mentioned technical problems, the objective of this invention is achieved as follows:

[0005] A screw with anti-theft and locking functions includes: a bolt and a nut; the nut is threadedly engaged with the bolt;

[0006] The nut includes a nut body; the nut body is circular, and an annular mounting groove along its circumference is formed on its circular wall; a regular polygonal columnar connecting body is fixedly installed in the mounting groove; the connecting body is made of soft elastic material and has a hollow interior forming a receiving cavity; the receiving cavity is filled with magnetorheological fluid; the diameter of the inscribed circle of the regular polygon is greater than or equal to the diameter of the nut body.

[0007] The connecting body is externally fitted with a regular polygonal annular interlocking body; the annular interlocking body is a magnet.

[0008] Based on the above scheme and as a preferred embodiment of the above scheme, the connecting compound is made of fluororubber, silicone rubber or EPDM rubber.

[0009] Based on the above scheme and as a preferred embodiment of the above scheme, the annular interlocking body is a samarium cobalt permanent magnet or an aluminum nickel cobalt permanent magnet.

[0010] Based on the above scheme and as a preferred embodiment of the above scheme, the connecting body is covered with a metal wire braided mesh; the upper and lower ends of the metal wire braided mesh are fixedly connected to the nut body.

[0011] Based on the above scheme and as a preferred embodiment of the above scheme, the nut body is provided with a plurality of fixing rods arranged along its axial direction and evenly distributed along its circumference in the mounting groove; the connecting body is provided with a plurality of through holes adapted to the fixing rods.

[0012] Based on the above scheme and as a preferred embodiment of the above scheme, the top of the nut body is provided with an outwardly extending extension; the extension is magnetic and extends to be able to cooperate with the annular interlocking body.

[0013] Based on the above scheme and as a preferred embodiment of the above scheme, the bottom of the extension part is provided with a number of positioning protrusions; the top of the annular interlocking body is provided with a number of positioning grooves that are adapted to the positioning protrusions.

[0014] Based on the above scheme and as a preferred embodiment of the above scheme, the extension part is circular, and the top is provided with a number of first wedge-shaped protrusions evenly distributed along its circumference; a locking washer is fitted on the bolt; the bottom surface of the locking washer is provided with a second wedge-shaped protrusion that matches the first wedge-shaped protrusions, and the top surface is provided with a number of anti-slip protrusions.

[0015] The beneficial effects of this invention are as follows: The nut is fitted with a connecting body made of a soft, elastic material, and the connecting body is filled with a magnetorheological fluid. In the absence of a magnetic field, the magnetorheological fluid has a low viscosity and is liquid, causing the connecting body to remain soft and elastic, making it impossible to turn the nut with a wrench or other tools. When the annular fitting is fitted outside the connecting body, its magnetic properties harden the magnetorheological fluid, allowing the nut to be turned with a tool. This invention requires specific accessories to turn the nut, thus providing an anti-theft effect. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention.

[0017] Figure 2 This is a front view of part of the structure of the present invention.

[0018] Figure 3 for Figure 2 Sectional view at point AA.

[0019] Figure 4 This is an exploded view of part of the structure of the present invention.

[0020] Figure 5 This is a schematic diagram of the nut exploding according to the present invention.

[0021] In the diagram: 1. Bolt; 2. Nut; 21. Nut body; 22. Connecting mating body; 23. Wire mesh; 24. Fixing rod; 25. Through hole; 26. Extension part; 27. Positioning protrusion; 28. First wedge-shaped protrusion; 3. Annular interlocking body; 31. Positioning groove; 4. Locking washer; 41. Second wedge-shaped protrusion; 42. Anti-slip protrusion. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] like Figure 1 As shown, a screw with anti-theft and locking functions includes: a bolt 1 and a nut 2, wherein the nut 2 is threadedly engaged with the bolt 1.

[0024] Among them, such as Figure 5 As shown, the nut 2 includes a nut body 21, which has a cylindrical structure with a central hole to fit the screw 1, and an annular mounting groove along its circumference on its outer wall.

[0025] A regular polygonal columnar connecting body 22 is fixedly installed within the mounting groove. The connecting body 22 is made of a soft, elastic material, with a hollow interior forming a receiving cavity filled with magnetorheological fluid. The soft, elastic material allows the connecting body 22 to maintain its regular polygonal columnar structure. Preferably, the connecting body 22 is made of fluororubber, silicone rubber, or EPDM rubber. Rubber is not only soft and elastic but also has advantages such as wear resistance, durability, and corrosion resistance, meeting the requirements for long-term use.

[0026] The diameter of the inscribed circle of the regular polygon is greater than or equal to the diameter of the nut body 21, so that the size of the connecting mating body 22 is larger than the size of the nut body 21, and its edge protrudes from the nut body 21 for easy mating.

[0027] like Figure 2 and Figure 4 As shown, a regular polygonal annular fitting 3 is fitted to the outside of the connecting body 22. The annular fitting 3 is a magnet. In this embodiment, the connecting body 22 is a regular hexagonal prism structure, and the annular fitting 3 is a regular hexagonal ring structure, fitting snugly around the outside of the regular hexagonal connecting body 22. This causes the magnetorheological fluid inside the connecting body 22 to solidify, making the connecting body 22 hard. Together with the annular fitting 3, they form a rotating part. By clamping the rotating part with a wrench or other tools, the nut can be rotated. Preferably, the annular fitting 3 is a samarium cobalt permanent magnet or an alnico permanent magnet, which not only has high magnetic strength but also high hardness and high rigidity, thus meeting the requirements for nut rotation.

[0028] like Figure 3 and Figure 4As shown, a metal wire mesh 23 is provided as an outer cover for the connecting body 22, and the upper and lower ends of the metal wire mesh 23 are fixedly connected to the nut body 21. The metal wire mesh 23 is thin and flexible, and can fit against the outer surface of the connecting body 22, providing isolation and protection. The rubber connecting body 22 is easily scratched and punctured; covering it with the metal wire mesh 23 can improve its durability. Preferably, the metal wire mesh 23 is a nickel-titanium alloy wire mesh.

[0029] The nut body 21 has several fixing rods 24 arranged axially and evenly distributed circumferentially within the mounting groove. The connecting body 22 has several through holes 25 that are adapted to the fixing rods 24. The fixing rods 24 can improve the connection stability of the connecting body 22 and ensure that the connecting body 22 and the nut body 21 rotate synchronously.

[0030] like Figure 4 and Figure 5 As shown, the top of the nut body 21 is provided with an outwardly extending extension 26. The extension 26 is magnetic and extends to engage with the annular fitting 3. When the nut is rotated using the annular fitting 3, it is magnetically attracted to the magnetic extension 26 by its own magnetic force to ensure stable connection to the nut, preventing it from moving up and down and detaching from the nut during rotation. Furthermore, the bottom of the extension 26 is provided with several positioning protrusions 27, and the top of the annular fitting 3 is provided with several positioning grooves 31 that are adapted to the positioning protrusions 27. The engagement of the positioning protrusions 27 and the positioning grooves 31 improves the connection stability between the annular fitting 3 and the extension 26.

[0031] The extension portion 26 is circular, with several first wedge-shaped protrusions 28 evenly distributed along its circumference on its top. A locking washer 4 is fitted onto the bolt 1. The bottom surface of the locking washer 4 has second wedge-shaped protrusions 41 that match the first wedge-shaped protrusions 28, and the top surface has several anti-slip protrusions 42. The circular extension portion 26 and the locking washer 4 are arranged opposite each other to form a locking washer. When the bolt and nut are tightened, the nut 2 exerts pressure on the locking washer, causing the wedge-shaped protrusions of the locking washer to squeeze against each other. Since the slope angle α of the wedge-shaped protrusions is greater than the bolt thread angle β, the wedge-shaped protrusions of the locking washer will generate a radial component force along the inclined surface of the bolt thread, making the locking washer fit tightly between the nut 2 and the fastened part, generating a large frictional force, preventing the nut 2 from loosening, and achieving the locking of the screw. The anti-slip protrusions 42 on the top surface of the locking washer 4 contact the fastened part, increasing the frictional force and preventing slippage.

[0032] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A screw with anti-theft and locking functions, characterized in that, include: Bolt (1) and nut (2); the nut (2) is threadedly engaged with the bolt (1); The nut (2) includes a nut body (21); the nut body (21) is circular, and an annular mounting groove along its circumference is formed on its circular wall; a regular polygonal columnar connecting body (22) is fixedly installed in the mounting groove; the connecting body (22) is made of soft elastic material and has a hollow interior forming a receiving cavity; the receiving cavity is filled with magnetorheological fluid; the diameter of the inscribed circle of the regular polygon is greater than or equal to the diameter of the nut body (21); The connecting body (22) is externally fitted with a regular polygonal ring-shaped interlocking body (3); the ring-shaped interlocking body (3) is a magnet.

2. A screw with anti-theft and locking functions according to claim 1, characterized in that, The connecting complex (22) is made of fluororubber, silicone rubber or EPDM rubber.

3. A screw with anti-theft and locking functions according to claim 1, characterized in that, The annular interlocking body (3) is a samarium cobalt permanent magnet or an aluminum nickel cobalt permanent magnet.

4. A screw with anti-theft and locking functions according to claim 1, characterized in that, The connecting body (22) is covered with a metal wire mesh (23); the upper and lower ends of the metal wire mesh (23) are fixedly connected to the nut body (21).

5. A screw with anti-theft and locking functions according to claim 1, characterized in that, The nut body (21) has a plurality of fixing rods (24) arranged along its axial direction and evenly distributed along its circumference in the mounting groove; the connecting body (22) has a plurality of through holes (25) adapted to the fixing rods (24).

6. A screw with anti-theft and locking functions according to claim 1, characterized in that, The nut body (21) has an outwardly extending extension (26) at its top; the extension (26) is magnetic and extends to engage with the annular interlocking body (3).

7. A screw with anti-theft and locking functions according to claim 6, characterized in that, The bottom of the extension (26) is provided with a plurality of positioning protrusions (27); the top of the annular fitting (3) is provided with a plurality of positioning grooves (31) that are adapted to the positioning protrusions (27).

8. A screw with anti-theft and locking functions according to claim 6, characterized in that, The extension (26) is circular, and a number of first wedge-shaped protrusions (28) are evenly distributed along its circumference at the top; a locking washer (4) is fitted on the bolt (1); the bottom surface of the locking washer (4) is provided with a second wedge-shaped protrusion (41) that matches the first wedge-shaped protrusions (28), and a number of anti-slip protrusions (42) are provided on the top surface.

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