Anti-loosening and anti-theft nut

Abstract

The utility model relates to a kind of anti-disassembly theft-proof nut, belong to nut technical field;Including built-in nut and external nut, built-in nut is set in the internal of external nut, built-in nut is screwed to the outside of bolt, there is a set of limiting mechanism between built-in nut and external nut, the limiting mechanism includes first limit block and second limit block, wherein first limit block is slidably arranged in the internal of external nut, first limit block is slidably arranged between built-in nut and external nut, first limit block and second limit block are clamped;Solve the problem that the current nut anti-looseness theft-proof effect is poor.

Description

Technical Field

[0001] This utility model belongs to the field of nut technology, specifically relating to an anti-removal and anti-theft nut. Background Technology

[0002] In the field of mechanical connections, nuts are widely used to achieve fastening connections between components. In various industries such as machinery, construction facilities, and automobile manufacturing, nuts are often widely used in environments with complex conditions such as vibration and impact to ensure the stability and safety of the connection.

[0003] However, traditional devices do not have anti-removal and anti-theft functions, which means that in actual use, the nuts may become loose or even be illegally removed due to external environmental factors or human factors. Once the nuts become loose, the vibration generated by the continuous operation of the equipment can easily cause gaps or displacement in the connection parts, which in turn reduces the accuracy and damages the performance of the equipment.

[0004] This will not only affect the normal operation of the equipment, leading to reduced production efficiency and decreased product quality, but also increase maintenance costs and downtime due to frequent equipment failures, thereby affecting the smooth operation of the entire production process and potentially causing safety accidents, posing a potential threat to personnel and property. Utility Model Content

[0005] This invention overcomes the shortcomings of existing technologies and proposes an anti-loosening and anti-theft nut; solving the problem of poor anti-loosening and anti-theft effects of current nuts.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution.

[0007] An anti-removal and anti-theft nut includes an inner nut and an outer nut. The inner nut is disposed inside the outer nut and screwed onto the outside of a bolt. A limiting mechanism is provided between the inner nut and the outer nut. The limiting mechanism includes a first limiting block and a second limiting block. The first limiting block is slidably disposed inside the outer nut and between the inner nut and the outer nut. The first limiting block and the second limiting block are engaged with each other.

[0008] Furthermore, the external nut has a hexagonal prism structure, and a first through hole with two ends connected is provided inside the external nut. The first through hole includes a first cylindrical cavity, a second cylindrical cavity, and a third cylindrical cavity that are connected in sequence and have gradually increasing inner diameters. A ring of countersunk holes is provided on the end face of the second cylindrical cavity near the first cylindrical cavity, and an internal pin is placed inside each countersunk hole.

[0009] Furthermore, six square mounting slots arranged in a circular array are provided on the inner wall of the second cylindrical cavity. Each mounting slot has a square outer limiting slot on the inner wall of the side away from the axis of the external nut. The six outer limiting slots are located at the middle of the six outer sides of the external nut.

[0010] Furthermore, six first perforations arranged in a circular array are provided on the end face of the third cylindrical cavity near the second cylindrical cavity, with one end of the first perforation extending into the mounting groove.

[0011] Furthermore, the built-in nut includes a hemispherical segment, a first cylindrical segment, a second cylindrical segment, and a third cylindrical segment connected in sequence and with their axes coinciding. The diameter of the hemispherical segment is smaller than the outer diameter of the first cylindrical segment, the outer diameter of the first cylindrical segment is larger than the outer diameter of the second cylindrical segment, and the outer diameter of the second cylindrical segment is larger than the outer diameter of the third cylindrical segment. A second through hole with its two ends connected is provided at the axis of the built-in nut. The inner diameter of the second through hole is equal to the inner diameter of the first cylindrical cavity, and an internal thread is provided on the inner wall of the second through hole.

[0012] Furthermore, six square inner limiting grooves arranged in a circular array are provided on the side wall of the third cylindrical segment; six circular twisted grooves are provided on the outer spherical surface of the hemispherical segment, and a second through hole is provided on the bottom surface of each twisted groove, the second through hole passing through the first cylindrical segment and the second cylindrical segment.

[0013] Furthermore, the third cylindrical section of the built-in nut is inserted into the second cylindrical cavity of the external nut, and the second cylindrical section of the built-in nut is inserted into the third cylindrical cavity of the external nut. The six outer limiting grooves on the external nut correspond one-to-one with the six inner limiting grooves on the built-in nut; the six first through holes on the external nut correspond one-to-one with the six second through holes on the built-in nut.

[0014] Furthermore, a square bearing frame with two connected ends is fixedly installed inside each mounting slot of the external nut. A guide rail is fixedly installed on each side inside the bearing frame. Two guide posts are also fixedly installed inside the bearing frame, located between the two guide rails. A first limiting block is slidably installed inside each bearing frame. The first limiting block is slidably installed outside the two guide posts, and its two ends are engaged with the guide rails on both sides.

[0015] Furthermore, the six pressing columns pass through the six first through holes of the external nut, the six second through holes of the internal nut, and the six side walls of the bearing frame in sequence, and are then fixedly connected to the six first limiting blocks.

[0016] Furthermore, the six second limiting blocks pass through the six outer limiting grooves of the outer nut and the six bearing frames in sequence and extend into the six inner limiting grooves of the inner nut. Each second limiting block is provided with a U-shaped groove, and the first limiting block engages with the U-shaped groove on the second limiting block.

[0017] The beneficial effects of this utility model compared to the prior art are as follows: 1. This device, with its multiple sets of grooves on the built-in nut and multiple sets of countersunk holes and built-in pins on the external nut, allows users to rotate the built-in nut using a special tool in conjunction with the grooves, improving the ease of operation. Before initially screwing the built-in nut and bolt together, the user can further secure the external nut to the external connection structure by inserting the built-in pin into the countersunk hole, eliminating concerns about the nut loosening under vibration or other conditions, thus enhancing the device's anti-loosening capability.

[0018] 2. When using this device, the user can press multiple sets of pressing pins to move the first limiting block within the guide rail, allowing the user to control the connection between the first and second limiting blocks, thus improving the operability of the device's limiting structure. Furthermore, through the cooperation of multiple limiting structures with the inner limiting groove on the built-in nut and the outer limiting groove on the external nut, the device can prevent the nut from being accidentally disassembled in complex usage environments, providing reliable anti-theft protection and improving its anti-removal and anti-theft performance. Attached Figure Description

[0019] The present invention will now be described in further detail with reference to the accompanying drawings: Figure 1 This is a three-dimensional schematic diagram of the entire utility model; Figure 2 This is a front view of the entire utility model; Figure 3 This is an exploded view of the interior nut and the exterior nut; Figure 4 This is a three-dimensional schematic diagram of the present invention after half-section of the internal nut and the external nut; Figure 5 This is a front sectional view of the present invention; Figure 6 This is a 3D schematic diagram of an external nut; Figure 7 This is a front sectional view of the external nut; Figure 8 This is a 3D schematic diagram of the built-in nut; Figure 9 This is a front sectional view of the built-in nut; Figure 10 This is a schematic diagram of the limiting mechanism; Figure 11 This is an exploded view of the limit mechanism; Among them, 1 is the built-in nut, 2 is the external nut, 3 is the first limiting block, 4 is the second limiting block, 5 is the first cylindrical cavity, 6 is the second cylindrical cavity, 7 is the third cylindrical cavity, 9 is the built-in pin, 10 is the mounting groove, 11 is the outer limiting groove, 12 is the first through hole, 13 is the hemispherical segment, 14 is the first cylindrical segment, 15 is the second cylindrical segment, 16 is the third cylindrical segment, 17 is the internal thread, 18 is the inner limiting groove, 19 is the twist groove, 20 is the second through hole, 21 is the bearing frame, 22 is the guide rail, 23 is the guide post, and 24 is the pressing post. Detailed Implementation

[0020] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, this utility model will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit it. The technical solution of this utility model will be described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0021] like Figure 1 As shown in Figure 11, this utility model provides an anti-removal and anti-theft nut, including an inner nut 1 and an outer nut 2. The inner nut 1 is disposed inside the outer nut 2 and is screwed to the outside of the bolt. A limiting mechanism is provided between the inner nut 1 and the outer nut 2. The limiting mechanism includes a first limiting block 3 and a second limiting block 4. The first limiting block 3 is slidably disposed inside the outer nut 2 and between the inner nut 1 and the outer nut 2. The first limiting block 3 and the second limiting block 4 are engaged with each other.

[0022] The external nut 2 has a hexagonal prism structure. Inside the external nut 2, there is a first through hole with both ends connected. The first through hole includes a first cylindrical cavity 5, a second cylindrical cavity 6, and a third cylindrical cavity 7 connected sequentially with gradually increasing inner diameters. A ring of countersunk holes is provided on the end face of the second cylindrical cavity 6 near the first cylindrical cavity 5. An internal pin 9 is placed inside each countersunk hole, with its end extending to the outer side of the end face of the external nut 2. Six square mounting slots 10 arranged in a circular array are provided on the inner wall of the second cylindrical cavity 6. Each mounting slot 10 has a square outer limiting groove 11 on its inner wall away from the axis of the external nut 2. The six outer limiting grooves 11 are located at the center of the six outer sides of the external nut 2. The height of the mounting slot 10 is greater than the height of the outer limiting groove 11, and the width of the mounting slot 10 is greater than the width of the outer limiting groove 11. On the end face of the third cylindrical cavity 7 near the second cylindrical cavity 6, there are six first through holes 12 arranged in a circular array. The axis of the first through holes 12 is parallel to the axis of the external nut 2, and one end of the inner side of the first through holes 12 extends into the mounting groove 10.

[0023] The built-in nut 1 comprises a hemispherical segment 13, a first cylindrical segment 14, a second cylindrical segment 15, and a third cylindrical segment 16 connected sequentially and with their axes coinciding. The diameter of the hemispherical segment 13 is smaller than the outer diameter of the first cylindrical segment 14, the outer diameter of the first cylindrical segment 14 is larger than the outer diameter of the second cylindrical segment 15, and the outer diameter of the second cylindrical segment 15 is larger than the outer diameter of the third cylindrical segment 16. A second through hole with both ends connected is provided at the axis of the built-in nut 1. The inner diameter of the second through hole is equal to the inner diameter of the first cylindrical cavity 5, and an internal thread 17 is provided on the inner wall of the second through hole. Six square inner limiting grooves 18 arranged in a circular array are provided on the side wall of the third cylindrical segment 16. The width and height of the inner limiting grooves 18 are equal to the width and height of the outer limiting grooves 11. Six circularly arranged twisted grooves 19 are provided on the outer spherical surface of the hemispherical segment 13. A second through hole 20 is provided on the bottom surface of each twisted groove 19. The axis of the second through hole 20 is parallel to the axis of the built-in nut 1. The second through hole 20 passes through the first cylindrical segment 14 and the second cylindrical segment 15.

[0024] The third cylindrical segment 16 of the built-in nut 1 is inserted into the second cylindrical cavity 6 of the external nut 2, and the second cylindrical segment 15 of the built-in nut 1 is inserted into the third cylindrical cavity 7 of the external nut 2. The end face of the built-in nut 1 near the third cylindrical segment 16 is in contact with the end face of the second cylindrical cavity 6 of the external nut 2 near the first cylindrical cavity 5. The six outer limiting grooves 11 on the external nut 2 correspond one-to-one with the six inner limiting grooves 18 on the built-in nut 1. The six first through holes 12 on the external nut 2 correspond one-to-one with the six second through holes 20 on the built-in nut 1.

[0025] The limiting mechanism also includes a support frame 21, guide rails 22, guide posts 23, and pressing posts 24. A square support frame 21 with open ends is fixedly installed inside each mounting slot 10 of the external nut 2. A guide rail 22 is fixedly installed on each side of the support frame 21. Two guide posts 23 are also fixedly installed inside the support frame (21), located between the two guide rails 22, with the axis of the guide posts 23 parallel to the axis of the external nut 2. A first limiting block 3 is slidably installed inside each support frame 21, slidingly positioned outside the two guide posts 23, with both ends of the first limiting block 3 engaging with the guide rails 22 on both sides. Six pressing posts 24 pass sequentially through the six first through holes 12 of the external nut 2, the six second through holes 20 of the internal nut 1, and the side walls of the six support frames 21, and are then fixedly connected to the six first limiting blocks 3. The six second limiting blocks 4 pass through the six outer limiting grooves 11 and the six bearing frames 21 of the outer nut 2 in sequence and extend into the six inner limiting grooves 18 of the inner nut 1. The second limiting blocks 4 are located between the two guide posts 23. Each second limiting block 4 is provided with a U-shaped groove, and the first limiting block 3 engages with the U-shaped groove on the second limiting block 4.

[0026] The built-in nut 1 is the core component that directly mates with the bolt, and its internal thread 17 enables a tight connection with the bolt. The external nut 2 serves as a protective and limiting component. Its internal first cylindrical cavity 5, second cylindrical cavity 6, and third cylindrical cavity 7 provide a stepped space to accommodate the built-in nut 1, adapting to its installation depth. A torsion spring, used with a special tool during assembly, drives the built-in nut 1 to rotate. A limiting mechanism is installed in the mounting slot 10 of the external nut 2, providing anti-loosening and anti-theft constraints for the built-in nut 1. A countersunk hole provides a channel for the external nut 2 to connect to external structures or for auxiliary limiting; the double-nut structure increases the difficulty of disassembly.

[0027] The working principle of this utility model is as follows: First, an internal pin 9 is placed inside each countersunk hole of the external nut 2, so that the end of the internal pin 9 extends to the outside of the end face of the external nut 2.

[0028] Then, the built-in nut 1 is placed inside the external nut 2, ensuring that the inner diameter of the first cylindrical cavity 5 of the external nut 2 matches the inner diameter of the second through hole of the built-in nut 1, to avoid gap shaking after assembly. Ensure that the bearing frames 21 inside the six mounting slots 10 of the external nut 2 are all installed in place, and that the guide rails 22, guide posts 23, and first limiting blocks 3 inside each bearing frame 21 are all installed in place. The first limiting blocks 3 are slidably set outside the two guide posts 23, and the first limiting blocks 3 are slidably engaged with the guide rails 22 on both sides. At this time, one end of the outer side of the pressing post 24 extends to the outer side of the first through hole 12, so that the first limiting blocks 3 are located at the top of the inner side of the bearing frame (21). Then, the second limiting block 4 is inserted from the outer limiting groove 11 of the external nut 2 and passes between the two pressing posts 24 of the bearing frame 21.

[0029] Then, using a special tool, insert it into the groove 19 of the built-in nut 1 and rotate the built-in nut 1 to keep the internal thread 17 on the built-in nut 1 firmly connected to the bolt until the preset tightening force is reached. As the built-in nut 1 and the bolt are continuously tightened, a ring of built-in pins 9 is continuously pushed towards the end of the external connection structure. The end of the built-in pins 9 is locked with the end face of the external connection structure, thereby preventing the nut from being pried open by force and ensuring that the external nut 2 can no longer rotate relative to the external connection structure.

[0030] Then, push the outer end of the second limiting block 4 so that the inner end of the second limiting block 4 extends into the inner limiting groove 18 of the built-in nut 1. At this time, the U-shaped groove on the second limiting block 4 corresponds to the first limiting block 3. Then press the outer end of each pressing post 24 so that the outer end of the pressing post 24 enters into the first through hole 12. The pressing post 24 drives the first limiting block 3 to move closer to the second limiting block 4 until the first limiting block 3 and the U-shaped groove on the second limiting block 4 are engaged, completing the mechanical locking. Once the outer end of the pressing column 24 enters the first through hole 12, it cannot be pulled out in the opposite direction. Therefore, the first limiting block 3 is always engaged with the U-shaped groove on the second limiting block 4. Due to the obstruction of the first limiting block 3, the second limiting block 4 cannot be dislodged from the inner nut 1 and the outer nut 2. Since the second limiting block 4 is simultaneously inserted into the outer limiting groove 11 of the outer nut 2 and the inner limiting groove 18 of the inner nut 1, the inner nut 1 can no longer rotate relative to the outer nut 2. Since the outer nut 2 can also not rotate relative to the external connecting structure, the rotation path of the inner nut 1 is completely blocked, and the inner nut 1 can no longer rotate relative to the bolt, thus achieving anti-loosening.

[0031] Finally, check whether each limiting component is installed in place, ensuring that the U-shaped groove on the first limiting block 3 engages with the second limiting block 4, the second limiting block 4 extends into the inner limiting groove 18 of the built-in nut 1, and the outer end of the pressing column 24 extends into the first through hole 12 without loosening, thus completing the anti-disassembly and anti-theft assembly.

[0032] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A type of anti-removal and anti-theft nut, characterized in that: It includes an internal nut (1) and an external nut (2). The internal nut (1) is located inside the external nut (2) and is screwed to the outside of the bolt. A limiting mechanism is provided between the internal nut (1) and the external nut (2). The limiting mechanism includes a first limiting block (3) and a second limiting block (4). The first limiting block (3) is slidably located inside the external nut (2) and slidably located between the internal nut (1) and the external nut (2). The first limiting block (3) and the second limiting block (4) are engaged with each other.

2. The anti-removal and anti-theft nut according to claim 1, characterized in that: The external nut (2) is a hexagonal prism structure. A first through hole with two ends connected is provided inside the external nut (2). The first through hole includes a first cylindrical cavity (5), a second cylindrical cavity (6), and a third cylindrical cavity (7) connected in sequence with gradually increasing inner diameter. A ring of countersunk holes is provided on the end face of the second cylindrical cavity (6) near the first cylindrical cavity (5). An internal pin (9) is placed inside each countersunk hole.

3. The anti-removal and anti-theft nut according to claim 2, characterized in that: On the inner wall of the second cylindrical cavity (6), there are six square mounting slots (10) arranged in a circular array. Each mounting slot (10) has a square outer limiting slot (11) on the inner wall of the side away from the axis of the external nut (2). The six outer limiting slots (11) are located in the middle of the six outer sides of the external nut (2).

4. The anti-removal and anti-theft nut according to claim 3, characterized in that: Six circular array first perforations (12) are provided on the end face of the third cylindrical cavity (7) near the second cylindrical cavity (6), and one end of the first perforation (12) extends into the mounting groove (10).

5. The anti-removal and anti-theft nut according to claim 4, characterized in that: The built-in nut (1) includes a hemispherical segment (13), a first cylindrical segment (14), a second cylindrical segment (15), and a third cylindrical segment (16) connected in sequence and with their axes overlapping. The diameter of the hemispherical segment (13) is smaller than the outer diameter of the first cylindrical segment (14), the outer diameter of the first cylindrical segment (14) is larger than the outer diameter of the second cylindrical segment (15), and the outer diameter of the second cylindrical segment (15) is larger than the outer diameter of the third cylindrical segment (16). A second through hole with both ends connected is provided at the axis of the built-in nut (1). The inner diameter of the second through hole is equal to the inner diameter of the first cylindrical cavity (5), and an internal thread (17) is provided on the inner wall of the second through hole.

6. The anti-removal and anti-theft nut according to claim 5, characterized in that: Six square inner limiting grooves (18) arranged in a circular array are provided on the side wall of the third cylindrical section (16); six circular twisted grooves (19) are provided on the outer spherical surface of the hemispherical section (13), and a second through hole (20) is provided on the bottom surface of each twisted groove (19), the second through hole (20) passes through the first cylindrical section (14) and the second cylindrical section (15).

7. The anti-removal and anti-theft nut according to claim 6, characterized in that: The third cylindrical section (16) of the built-in nut (1) is inserted into the second cylindrical cavity (6) of the external nut (2), and the second cylindrical section (15) of the built-in nut (1) is inserted into the third cylindrical cavity (7) of the external nut (2). The six outer limiting grooves (11) on the external nut (2) correspond one-to-one with the six inner limiting grooves (18) on the built-in nut (1). The six first through holes (12) on the external nut (2) correspond one-to-one with the six second through holes (20) on the built-in nut (1).

8. The anti-removal and anti-theft nut according to claim 7, characterized in that: Inside each mounting slot (10) of the external nut (2), a square bearing frame (21) with two connected ends is fixedly installed. Inside the bearing frame (21), a guide rail (22) is fixedly installed on both sides. Inside the bearing frame (21), two guide posts (23) are also fixedly installed. The two guide posts (23) are located between the two guide rails (22). Inside each bearing frame (21), a first limiting block (3) is slidably installed. The first limiting block (3) is slidably installed outside the two guide posts (23). The two ends of the first limiting block (3) are respectively engaged with the guide rails (22) on both sides.

9. The anti-removal and anti-theft nut according to claim 8, characterized in that: The six pressing columns (24) pass through the six first through holes (12) of the external nut (2), the six second through holes (20) of the internal nut (1), and the side wall of the six bearing frames (21) in sequence, and are then fixedly connected to the six first limiting blocks (3).

10. The anti-removal and anti-theft nut according to claim 9, characterized in that: The six second limiting blocks (4) pass through the six outer limiting grooves (11) and six bearing frames (21) of the outer nut (2) in sequence and then extend into the six inner limiting grooves (18) of the inner nut (1). Each second limiting block (4) is provided with a U-shaped groove. The first limiting block (3) engages with the U-shaped groove on the second limiting block (4).

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