A tamperproof one-way stainless steel nut

Abstract

The utility model provides a kind of anti-disassembly one-way stainless steel nut, to solve the problems of the insufficient anti-disassembly performance, poor structural stability and high production cost of the existing nut device, including inner sleeve and hex block, the nut body is equipped with inner sleeve inside, the hex block is sleeved in the outer portion of inner sleeve, the inner sleeve outer wall is matched with the inner wall of hex block;The inner thread I is equipped in the inner sleeve inside along the axial direction, the inner sleeve is equipped with anti-disassembly mechanism, the anti-disassembly mechanism includes one-way limiting ring, one-way tooth and limiting spring, the limiting spring is connected inner sleeve and one-way limiting ring, the inner wall of one-way limiting ring is equipped with a plurality of one-way tooth that is evenly distributed along the circumferential direction, the anti-disassembly performance of the present application is improved, the structural stability is enhanced and convenient to operate, suitable for modern industrial manufacturing, mechanical equipment, electronic equipment and all kinds of engineering construction fields, can be widely applied to the connection and fixed link of various equipment and device.

Description

Technical Field

[0001] This utility model relates to the field of nut technology, and in particular to a one-way stainless steel nut that is resistant to disassembly. Background Technology

[0002] In modern industrial manufacturing, machinery and equipment, electronic equipment, and various engineering construction fields, nuts, as a basic and critical fastener, are widely used in the connection and fixing of various equipment and devices. However, with the development of technology and the increasing complexity and diversity of application scenarios, the performance requirements for nuts are also constantly increasing, especially their anti-disassembly performance, which has become one of the focuses of attention in many fields. In many practical applications, if the nut connection of some important equipment or key parts is arbitrarily disassembled, it may cause serious safety problems, equipment failures, or even economic losses.

[0003] The utility model patent with authorization announcement number CN203023242U discloses a "one-way tightening nut for municipal facilities", which includes a hexagonal nut body. Each of the six corners of the hexagonal nut body has a locking tongue with a pawl at its front end. The locking tongue is positioned on the hexagonal nut body through a fixing hole at its tail and a fixing shaft. A spring plate is also provided on the fixing shaft, and the spring plate acts on the locking tongue. This utility model has a simple overall structure and is easy to use. It can be applied to highway bridges or railway bridges, as well as power transmission towers and various large steel structure devices, ensuring the stability and reliability of various fastening nuts, preventing loosening in one direction. However, this utility model only uses a simple locking structure, which only increases the difficulty of disassembly and cannot effectively prevent disassembly by professional tools. Furthermore, the anti-disassembly components are prone to failure after long-term use or under external impact, causing the nut's anti-disassembly function to gradually weaken or even be completely lost, affecting the reliability of the equipment or device.

[0004] To improve the anti-disassembly effect, the utility model with authorization announcement number CN220337246U discloses an "anti-disassembly one-way stainless steel nut", including a threaded sleeve with a threaded hole; an anti-disassembly mechanism, the anti-disassembly mechanism including a fixed sleeve, the fixed sleeve is connected to the top of the threaded sleeve, and the upper and lower parts of the fixed sleeve are open. A hot melt adhesive sleeve is connected to the inner surface of the fixed sleeve, and the inner diameter of the hot melt adhesive sleeve is the same as the diameter of the threaded hole of the threaded sleeve, for heating and melting. The fixed sleeve is a stainless steel component, and a rubber ring with a thickness of two millimeters is connected to the bottom of the threaded sleeve for friction limiting. This utility model adopts a design in which the hot melt adhesive sleeve can melt in the fixed sleeve, resulting in better stability of the device and less likelihood of jamming during rotation installation; however, this utility model uses high-cost materials, increasing production costs, making the manufacturing process cumbersome, reducing production efficiency, and requiring special processing technology.

[0005] In summary, existing nut assemblies typically have the following drawbacks: 1) Insufficient anti-disassembly performance: Some existing nut devices only use simple locking structures, such as anti-slip textures or complex thread shapes on the nut. However, these structures often only increase the difficulty of disassembly and cannot effectively prevent disassembly by professional tools. Moreover, the anti-disassembly components are prone to failure after long-term use or when subjected to external impact, which leads to the gradual weakening or even complete loss of the nut's anti-disassembly function, affecting the reliability of the equipment or device. 2) Poor structural stability: Some existing nut devices have unreasonable internal structural designs, which makes it easy for parts to loosen or fall off during use. The nut connection is not tight enough, which can easily cause relative displacement, affecting the fastening effect of the nut and even causing equipment failure. When subjected to large external forces, the nut device is prone to deformation or damage, thereby reducing the service life and reliability of the nut. 3) High production costs: Some existing nut devices use complex and precise mechanical structures or materials to achieve the anti-disassembly function. This not only increases production costs, but also makes the manufacturing process cumbersome and reduces production efficiency. Special processing technology or high-precision molds are required to manufacture anti-disassembly parts, which further increases production costs. Summary of the Invention

[0006] The purpose of this invention is to solve the problems in the prior art by proposing a one-way stainless steel nut that is resistant to disassembly, which can solve the problems of insufficient anti-disassembly performance, poor structural stability and high production cost.

[0007] To achieve the above objectives, this utility model proposes a detachable one-way stainless steel nut, comprising an inner sleeve and a hexagonal block. The inner sleeve is located inside the nut body, and the hexagonal block is fitted onto the outside of the inner sleeve. The outer wall of the inner sleeve mates with the inner wall of the hexagonal block. The inner sleeve has an internal thread I along the axial direction and is equipped with an detachable mechanism. The detachable mechanism includes a one-way limiting ring, one-way teeth, and a limiting spring. The limiting spring connects the inner sleeve and the one-way limiting ring. The inner wall of the one-way limiting ring has several one-way teeth evenly distributed circumferentially. The top of the hexagonal block has an annular groove, and the end of the annular groove near the inner sleeve has an inwardly protruding retaining tooth. The outer surface of the hexagonal block has hexagonal edges, and a protective sleeve is provided on the outer side of the hexagonal block. The side wall of the inner sleeve has several pin holes, and the hexagonal block has a positioning hole at a corresponding position. The positioning pin is installed by engaging with the positioning hole and the pin hole.

[0008] Preferably, the inner sleeve further includes an external thread, and the hexagonal block is provided with an internal thread II that matches the external thread, and the inner sleeve is threadedly connected to the hexagonal block.

[0009] Preferably, one side of the unidirectional tooth is an inclined surface and the other side is a straight surface, the inclination angle of the inclined surface is 30° to 60°, and the straight surface is perpendicular to the axis of the inner sleeve.

[0010] Preferably, each edge of the hexagonal edge is provided with a positioning hole, the number of positioning holes is greater than the number of pin holes, and the diameter of the positioning pin matches the diameter of the positioning hole and the pin hole.

[0011] Preferably, the connection between the locking teeth and the annular groove is an arc-shaped transition, and the protrusion direction of the locking teeth is consistent with the opening direction of the annular groove.

[0012] Preferably, the protective sleeve is a hexagonal cavity that matches the outer contour of the hexagonal block, and the inner wall of the protective sleeve fits against the outer wall of the hexagonal block.

[0013] The beneficial effects of this utility model are: 1) Enhanced anti-disassembly performance: The unique one-way teeth significantly enhance the anti-disassembly performance. Through the clever combination of the beveled and straight surfaces of the one-way teeth, the beveled surfaces of the one-way teeth interact with the bolt during tightening, allowing the one-way limiting ring to pass smoothly, while the straight surfaces form a strong barrier during reverse disassembly. 2) Enhanced structural stability: The inner sleeve and hexagonal block are connected by threaded joints, locking teeth, annular grooves and locating pins, which makes the components fit tightly and form a stable connection. Multiple locating holes at the hexagonal edges fit with the pin holes of the inner sleeve, further enhancing structural stability. Even under long-term use or external impact, it can still maintain good connection performance, reduce problems such as loosening and falling off of components, reduce the risk of equipment failure and improve equipment reliability. 3) Improved ease of operation: The hexagonal block has hexagonal edges on its outer surface, which meet the standard hexagonal tool size requirements, making installation convenient and quick. The one-way tooth tilt angle has been optimized, making the tightening process smooth and effortless. Users can quickly complete the installation operation, improving work efficiency. While maintaining high efficiency and anti-disassembly performance, the operation process has been simplified, enhancing the user experience.

[0014] The features and advantages of this utility model will be described in detail through embodiments and accompanying drawings. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 yes Figure 1 Enlarged schematic diagram of a one-way limiting ring; Figure 3 This is an external schematic diagram of the hexagonal block of this utility model; Figure 4 This is a top view of the inner sleeve of this utility model; Figure 5This is a top view of the hexagonal block of this utility model.

[0016] The following numbers are used in the diagram: 1-Nut body; 2-Inner sleeve; 21-Internal thread I; 22-External thread; 3-Hexagonal block; 31-Internal thread II; 32-Annular groove; 33-Clamping tooth; 34-Hexagonal edge; 4-Protective sleeve; 5-Anti-disassembly mechanism; 51-One-way limiting ring; 52-One-way tooth; 521-Beveled surface; 522-Straight surface; 53-Limiting spring; 6-Positioning pin; 61-Positioning hole; 62-Pin hole. Detailed Implementation

[0017] Example 1: See Figures 1 to 5 This utility model discloses a detachable one-way stainless steel nut, comprising an inner sleeve 2 and a hexagonal block 3, as shown below. Figure 1 As shown, the nut body 1 has an inner sleeve 2 inside, and the hexagonal block 3 is sleeved on the outside of the inner sleeve 2. The outer wall of the inner sleeve 2 mates with the inner wall of the hexagonal block 3. The inner sleeve 2 has an internal thread I21 along the axial direction inside, and the inner sleeve 2 is equipped with an anti-disassembly mechanism 5, such as... Figure 2 As shown, the anti-disassembly mechanism 5 includes a one-way limiting ring 51, a one-way tooth 52, and a limiting spring 53. The limiting spring 53 connects the inner sleeve 2 and the one-way limiting ring 51, as shown. Figure 4 As shown, the inner wall of the unidirectional limiting ring 51 is provided with a plurality of unidirectional teeth 52 evenly distributed along the circumference; as Figure 5 As shown, the hexagonal block 3 has an annular groove 32 at its top, and an inwardly protruding retaining tooth 33 at one end of the annular groove 32 near the inner sleeve 2. The outer surface of the hexagonal block 3 has hexagonal edges 34, and a protective sleeve 4 is provided on the outer side of the hexagonal block 3. Figure 3 As shown, the inner sleeve 2 has several pin holes 62 on its side wall, and the hexagonal block 3 has a positioning hole 61 at the corresponding position. The positioning pin 6 is installed in conjunction with the positioning hole 61 and the pin hole 62.

[0018] The inner sleeve 2 also includes an external thread 22, and the hexagonal block 3 is provided with an internal thread II 31 that matches the external thread 22. The inner sleeve 2 is threadedly connected to the hexagonal block 3. One side of the one-way tooth 52 is a bevel 521, and the other side is a straight surface 522. The inclination angle of the bevel 521 is 30° to 60°, and the straight surface 522 is perpendicular to the axis of the inner sleeve 2. Each edge of the hexagonal edge 34 is provided with a positioning hole 61. The number of positioning holes 61 is greater than the number of pin holes 62. The diameter of the positioning pin 6 matches the diameter of the positioning holes 61 and the pin holes 62. The connection between the retaining tooth 33 and the annular groove 32 is an arc transition. The protrusion direction of the retaining tooth 33 is consistent with the opening direction of the annular groove 32. The protective sleeve 4 is a hexagonal cavity that matches the outer contour of the hexagonal block 3. The inner wall of the protective sleeve 4 fits against the outer wall of the hexagonal block 3.

[0019] In this embodiment, the inner sleeve 2 is provided with an internal thread I21 along the axial direction. The internal thread I21 is a trapezoidal thread. The inner wall of the one-way limiting ring 51 is provided with a number of one-way teeth 52 evenly distributed along the circumference. One side of the one-way teeth 52 is a slope 521 with an inclination angle of 30°, and the other side is a straight surface 522. The top of the hexagonal block 3 is provided with an annular groove 32, and the end near the inner sleeve 2 is provided with an inwardly protruding locking tooth 33. The locking tooth 33 is arc-shaped. Each edge of the hexagonal block 3 is evenly distributed with 6 positioning holes 61, and the side wall of the inner sleeve 2 is provided with 2 pin holes 62.

[0020] In this embodiment, the nut body 1, inner sleeve 2, hexagonal block 3, one-way limiting ring 51, limiting spring 53, retaining tooth 33, protective sleeve 4, and other components are all made of 304 stainless steel. Stainless steel has strong corrosion resistance, good mechanical properties, and a long service life. The trapezoidal internal thread I21 makes the connection between the inner sleeve 2 and the external bolts and other mating components tighter and has good load-bearing performance, capable of withstanding greater tensile and compressive forces. The arc-shaped retaining tooth 33 provides a good clamping effect when it mates with the annular groove 32, effectively preventing relative rotation between the hexagonal block 3 and the inner sleeve 2. This design is suitable for equipment and devices with high requirements for connection strength and corrosion resistance, such as chemical equipment and marine equipment.

[0021] Example 2: This embodiment is basically the same as embodiment 1, except that: the internal thread I21 adopts a sawtooth thread, the inclined surface 521 of the one-way tooth 52 inside the inner sleeve 2 has an inclination angle of 45°, the locking tooth 33 at the top of the hexagonal block 3 is semi-circular, and the side wall of the inner sleeve 2 is provided with 4 pin holes 62.

[0022] In this embodiment, the internal thread I21 adopts a sawtooth thread. The sawtooth thread provides a firm connection and has good one-way self-locking performance, which can prevent the nut from loosening. This thread shape makes the connection between the inner sleeve 2 and the external bolts and other mating parts more secure, and has good one-way self-locking performance, which can effectively prevent the nut from loosening due to vibration or other reasons during use. The retaining tooth 33 is semi-circular in shape. This shape makes the transition between the retaining tooth 33 and the annular groove 32 smoother, reduces stress concentration, and improves the connection strength and reliability between the hexagonal block 3 and the inner sleeve 2. It is suitable for some equipment and devices with extremely high requirements for connection stability and corrosion resistance, such as nuclear power plant equipment and aerospace equipment.

[0023] Example 3: This embodiment is basically the same as embodiment 1, except that: the internal thread Ⅰ21 inside the inner sleeve 2 is a rectangular thread, the inclined surface 521 of the one-way tooth 52 has an inclination angle of 60°, the locking tooth 33 at the top of the hexagonal block 3 is square in shape, and the side wall of the inner sleeve 2 is provided with 6 pin holes 62.

[0024] In this embodiment, the protective sleeve 4 on the outside of the hexagonal block 3 is made of titanium alloy. Titanium alloy has high strength and light weight, which can reduce the weight of the equipment. This material has higher strength and lighter weight, which can reduce the weight of the equipment while ensuring the strength of the nut. The internal thread I21 adopts a rectangular thread. This thread shape makes the contact area between the inner sleeve 2 and the external bolts and other mating parts larger, the force is more even, and it can withstand greater torque and tension. The retaining tooth 33 is square in shape. This shape makes the fit between the retaining tooth 33 and the annular groove 32 tighter and has better anti-disassembly performance. Titanium alloy has high strength and light weight, which can reduce the weight of the equipment. It is suitable for some equipment and devices with strict requirements for connection strength and weight, such as sports equipment and medical devices.

[0025] Working principle: When the nut body 1 is rotated clockwise for tightening, the bolt or other threaded parts gradually screw into the internal thread I21 of the inner sleeve 2. At this time, the inclined surface 521 of the one-way tooth 52 contacts the surface of the mating part and generates a force. Due to the inclined angle design of the inclined surface 521, this force pushes the one-way limiting ring 51 to overcome the elastic force of the limiting spring 53, causing the one-way limiting ring 51 to move outward along the axial direction of the inner sleeve 2. As the nut is continuously tightened, the one-way limiting ring 51 is gradually compressed until the nut is fully tightened. During this process, the hexagonal block 3 and the inner sleeve 2 maintain a relatively stable state through the threaded connection and the engagement of the retaining tooth 33 and the annular groove 32, ensuring the tightness and stability of the entire nut structure. When attempting to disassemble the nut body 1 by rotating it counterclockwise, due to the one-way tooth... The other side of 52 is a straight surface 522, which is perpendicular to the axis of the inner sleeve 2. At this time, the straight surface 522 of the one-way tooth 52 is in contact with the surface of the bolt or other mating parts. The design of the straight surface 522 allows the one-way tooth 52 to firmly lock the mating parts, generating strong resistance and preventing the nut from rotating in the opposite direction. The elastic force of the limit spring 53 always pushes the one-way limit ring 51 towards the mating parts, making the contact between the one-way tooth 52 and the mating parts tighter and further enhancing the anti-disassembly effect. At the same time, the engagement of the locking teeth 33 between the hexagonal block 3 and the inner sleeve 2 and the annular groove 32, as well as the connection between the positioning pin 6 and the positioning hole 61 and the pin hole 62, also play an auxiliary role in preventing disassembly, ensuring that when the nut is subjected to disassembly force, there will be no relative displacement or loosening between the parts, thereby effectively preventing the nut from being disassembled without authorization.

[0026] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the protection scope of the present invention.

Claims

1. A detachable one-way stainless steel nut, comprising an inner sleeve (2) and a hexagonal block (3), characterized in that: The nut body (1) has an inner sleeve (2) inside, and the hexagonal block (3) is sleeved on the outside of the inner sleeve (2). The outer wall of the inner sleeve (2) is matched with the inner wall of the hexagonal block (3). The inner sleeve (2) has an internal thread I (21) along the axial direction. The inner sleeve (2) is provided with an anti-disassembly mechanism (5). The anti-disassembly mechanism (5) includes a one-way limiting ring (51), a one-way tooth (52), and a limiting spring (53). The limiting spring (53) connects the inner sleeve (2) and the one-way limiting ring (51). The inner wall of the one-way limiting ring (51) is provided with... There are several unidirectional teeth (52) evenly distributed along the circumference; the top of the hexagonal block (3) is provided with an annular groove (32), and the end of the annular groove (32) near the inner sleeve (2) is provided with an inwardly protruding locking tooth (33); the outer surface of the hexagonal block (3) is provided with a hexagonal edge (34), and the outer side of the hexagonal block (3) is provided with a protective sleeve (4); the side wall of the inner sleeve (2) is provided with several pin holes (62), and the hexagonal block (3) is provided with a positioning hole (61) at the corresponding position; the positioning pin (6) is installed in conjunction with the positioning hole (61) and the pin hole (62).

2. The unidirectional stainless steel nut with anti-disassembly as described in claim 1, characterized in that: The inner sleeve (2) also includes an external thread (22), and the hexagonal block (3) is provided with an internal thread II (31) that meshes with the external thread (22). The inner sleeve (2) and the hexagonal block (3) are threadedly connected.

3. The unidirectional stainless steel nut with anti-disassembly as described in claim 1, characterized in that: One side of the unidirectional tooth (52) is an inclined surface (521), and the other side is a straight surface (522). The inclination angle of the inclined surface (521) is 30° to 60°, and the straight surface (522) is perpendicular to the axis of the inner sleeve (2).

4. The unidirectional stainless steel nut with anti-disassembly as described in claim 1, characterized in that: Each edge of the hexagonal edge (34) is provided with a positioning hole (61), the number of positioning holes (61) is greater than the number of pin holes (62), and the diameter of the positioning pin (6) matches the diameter of the positioning hole (61) and the pin hole (62).

5. The unidirectional stainless steel nut with anti-disassembly as described in claim 1, characterized in that: The connection between the locking tooth (33) and the annular groove (32) is an arc transition, and the protrusion direction of the locking tooth (33) is consistent with the opening direction of the annular groove (32).

6. The unidirectional stainless steel nut with anti-disassembly as described in claim 1, characterized in that: The protective sleeve (4) is a hexagonal cavity that matches the outer contour of the hexagonal block (3), and the inner wall of the protective sleeve (4) is in contact with the outer wall of the hexagonal block (3).

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