Retaining type bolt and nut assembly
By using a tapered cavity and inner liner design, the inner liner clamps the bolts to prevent the nuts from loosening, solving the problem of traditional nuts easily loosening in vibration environments, and achieving simplified structure and efficient installation.
Patent Information
- Application Number
- CN202520742517.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-18
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-04-18
AI Technical Summary
Traditional nuts are prone to loosening in vibrating environments, and existing anti-loosening structures are complex and inconvenient to operate.
The structure employs a tapered cavity and inner liner plate. The inner liner plate slides along the tapered cavity to clamp the bolts, and the clamping force of the inner liner plate prevents the nuts from loosening, simplifying the structure and installation steps.
It effectively prevents nuts from loosening in vibrating environments, improves connection stability, simplifies the installation process, and increases operational efficiency.
Smart Images
Figure CN223894735U_ABST
Abstract
Description
Technical Field
[0001] The embodiments disclosed herein relate to the field of bolt and nut technology, and more specifically, to a non-retractable bolt and nut assembly. Background Technology
[0002] Bolts and nuts are commonly used fasteners. However, when equipment is in a vibrating environment or subjected to dynamic loads, traditional nuts may loosen or move backward due to repeated vibrations.
[0003] To solve the problem of loose nuts, most existing nuts use a pin to connect two nuts with opposite directions of rotation, intending to limit the rotation of the nuts. However, in actual use, it has been found that the pins themselves may also fall off under the influence of external vibrations. Moreover, in the process of engaging and tightening the nuts and bolts, it is necessary to both tighten the nuts and install pins on each nut, which is extremely inconvenient and seriously affects work efficiency. Utility Model Content
[0004] To overcome the above-mentioned defects, the embodiments of this disclosure provide a locking bolt and nut assembly, which solves the technical problems of poor loosening effect and cumbersome installation steps of conventional locking nuts in the prior art.
[0005] According to one aspect, at least one embodiment of this disclosure provides a lock-up bolt and nut assembly, including a bolt and a nut, the nut comprising:
[0006] The outer cylinder has a tapered cavity whose diameter gradually decreases along the axial direction, and the bottom of the tapered cavity has a second abutment surface;
[0007] The inner lining plate comprises several plates, each of which is slidably disposed on the inner wall of the tapered cavity along the axial direction of the cavity, with the bottom end of each inner lining plate abutting against the second abutting surface. The inner lining plates are arranged circumferentially. After sliding along the tapered cavity, the inner lining plates slide away from the second abutting surface. The tapered cavity is used to guide adjacent inner lining plates to move closer to each other so that the inner lining plates clamp the bolts.
[0008] Optionally, the top of the outer cylinder has a threaded hole, through which the outer cylinder is threadedly connected to a bolt.
[0009] Optionally, the bottom of the outer cylinder has a circular hole, and both the circular hole and the threaded hole are coaxially arranged with and communicate with the tapered cavity. A first abutting surface is formed between the threaded hole and the tapered cavity. The first abutting surface is used to limit the top of the inner liner plate. A second abutting surface is formed between the circular hole and the tapered cavity. The second abutting surface is used to limit the bottom of the inner liner plate.
[0010] Optionally, each of the inner liner plates has internal threads, and the inner liner plate is threaded to a bolt through the internal threads;
[0011] The bottom of the inner liner plate has a protrusion that penetrates the circular hole, and the bottom surface of the protrusion is located outside the bottom surface of the circular hole. The protrusion can abut against the nut of the bolt or the workpiece and drive the inner liner plate to move along the tapered cavity.
[0012] Optionally, the inner wall of the tapered cavity has several axially opening limiting grooves, and each inner liner plate is provided with a slider on its outer side, and each slider is slidably disposed in one of the limiting grooves.
[0013] Optionally, a spring sheet is further provided between the first contact surface and the top of the inner liner plate, the spring sheet being used to press the inner liner plate so that the protrusion extends to the outside of the circular hole.
[0014] Optionally, the top edge of the inner liner has a slope, which cooperates with the inner wall of the tapered cavity to form an anti-detachment groove, and the spring sheet has an outward expansion portion located within the anti-detachment groove.
[0015] Optionally, the spring sheet has a receiving space, and a rubber body is disposed in the receiving space to support the spring sheet.
[0016] Optionally, the sidewall of the protrusion is provided with a slot, and the outer cylinder has a mounting groove near the protrusion. An elastic retainer is provided in the mounting groove, and the elastic retainer engages with the slot. The elastic retainer includes:
[0017] A push rod is slidably disposed in a mounting groove, and the push rod has a locking tooth near the groove, the locking tooth engaging with the groove;
[0018] A spring is disposed in the mounting groove, with one end of the spring abutting against the push rod and the other end of the spring abutting against the inner wall of the mounting groove. The spring is used to press the retaining teeth into the retaining groove.
[0019] Optionally, the mounting groove is a through hole, and the elastic clip further includes:
[0020] A push rod is detachably mounted in the mounting groove, and the end of the spring away from the slot abuts against the push rod;
[0021] An inner plug is detachably disposed within the mounting groove. The end of the push rod away from the spring abuts against the inner plug. The inner plug is used to seal the mounting groove and support the push rod.
[0022] The beneficial effects of the embodiments disclosed herein are as follows:
[0023] In this disclosure, the nut is normally placed on the end of the bolt and tightened using tools such as a wrench. As the nut rotates, it gradually moves downwards along the bolt's axial direction. When the bottom surface of the nut's inner liner plate comes into contact with the workpiece or the nut itself, the inner liner plate begins to slide along the inner wall of the tapering cavity, moving away from the nut. During this sliding process, as the diameter of the tapering cavity gradually decreases, the distance between adjacent inner liner plates continuously shrinks. When the nut is tightened to near-tightness, the inner liner plates move closer together, tightly clamping the bolt. Therefore, once the nut is tightened, the inner liner plate effectively prevents the nut from loosening due to equipment vibration. In a vibrating environment, traditional nuts are prone to backward slippage and loosening due to vibration. This nut, however, utilizes the clamping force of the inner liner plate to effectively suppress the rotation and displacement of the nut, greatly improving the stability of the connection. Furthermore, it eliminates the complex structure of traditional nuts requiring pin connections, achieving the anti-loosening function solely through the nut itself, simplifying the structure and installation steps. Attached Figure Description
[0024] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.
[0025] Figure 1 This is a schematic diagram of the structure of a bolt and nut in one embodiment of this disclosure;
[0026] Figure 2 for Figure 1 A schematic diagram of the external structure of the nut in the embodiment;
[0027] Figure 3 for Figure 2 Sectional view at point AA;
[0028] Figure 4 for Figure 2 A schematic diagram of the internal structure of the nut in the embodiment;
[0029] Figure 5 for Figure 2 A schematic diagram of the bottom structure of the nut in the embodiment;
[0030] Figure 6 for Figure 2 A schematic diagram of the inner lining plate structure in the embodiment;
[0031] Figure 7 for Figure 2 Enlarged view of a portion of point A in the middle;
[0032] Figure 8 for Figure 7 A schematic diagram of the spring sheet structure in the embodiment;
[0033] Figure 9 for Figure 2 Enlarged view of section B in the middle.
[0034] In the diagram: 1. Bolt, 2. Nut, 21. Outer cylinder, 210. Gradient cavity, 211. Limiting groove, 212. Mounting groove, 22. Inner liner, 201. Inclined surface, 220. Internal thread, 221. Protrusion, 223. Slot, 23. Threaded hole, 231. First contact surface, 24. Round hole, 241. Second contact surface, 25. Slider, 26. Anti-disengagement groove, 3. Spring plate, 31. Outward expansion, 32. Accommodation space, 100. Elastic clamp, 4. Rubber body, 5. Push rod, 501. Clamping tooth, 6. Spring, 7. Push rod, 8. Inner plug. Detailed Implementation
[0035] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.
[0036] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."
[0037] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.
[0038] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0039] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.
[0040] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0041] like Figures 1-9 As shown, a non-retractable bolt and nut assembly according to an embodiment of the present disclosure is illustrated, including a bolt 1 and a nut 2. The nut 2 includes an outer cylinder 21 and a plurality of inner liner plates 22. The outer cylinder 21 has a tapered cavity 210 whose diameter gradually decreases along its axial direction. The plurality of inner liner plates 22 are arranged circumferentially and are all slidably disposed on the inner wall of the tapered cavity 210 along the cavity axis. After the inner liner plates 22 slide along the tapered cavity 210, the tapered cavity 210 is used to guide adjacent inner liner plates 22 to move closer to each other so that the inner liner plates 22 clamp the bolt 1.
[0042] For example, such as Figures 1-3 As shown, nut 2 is normally placed on the end of bolt 1, and nut 2 is tightened with a wrench or other tools. As nut 2 rotates, it gradually moves downwards along the axial direction of bolt 1. When the bottom surface of the inner liner 22 of nut 2 abuts against the workpiece or nut 2, the inner liner 22 begins to slide along the inner wall of the tapering cavity 210 in the direction away from the nut. During the sliding process of the inner liner 22 along the tapering cavity 210, as the diameter of the tapering cavity 210 gradually decreases, the distance between adjacent inner liner 22 continuously decreases. When nut 2 is tightened to a near-tight state, the inner liner 22 move closer to each other to a certain extent, tightly clamping bolt 1. Therefore, after nut 2 is tightened, the inner liner 22 can effectively prevent nut 2 from loosening due to equipment vibration.
[0043] In a vibrating environment, traditional nuts 2 are prone to backing back and loosening due to vibration. However, this nut 2 utilizes the clamping force of the inner liner 22 to effectively suppress the rotation and displacement of the nut 2, greatly improving the stability of the connection. Furthermore, it eliminates the complex structure of traditional nuts 2 that requires pin connections, achieving the anti-loosening function solely through the nut 2 itself, simplifying the structure and installation steps.
[0044] In some examples, the outer cylinder 21 has a threaded hole 23 at the top, through which the outer cylinder 21 is threadedly connected to the bolt 1, and the outer cylinder 21 has a round hole 24 at the bottom. Both the round hole 24 and the threaded hole 23 are coaxially arranged with the tapered cavity 210 and communicate with each other.
[0045] For example, such as Figure 2 , Figure 4 and Figure 5 As shown, during installation, bolt 1 first enters the circular hole 24 and then passes through the threaded hole 23. The diameter of the circular hole 24 is larger than the diameter of the threaded hole 23. The threaded hole 23 ensures that bolt 1 and nut 2 are coaxially connected, while the larger diameter of the circular hole 24 facilitates the entry of bolt 1 into nut 2. It should be noted that the diameter of the threaded hole 23 formed by the internal threads 220 of several inner liner plates 22 is the same as the diameter of the threaded hole 23. Therefore, in the early stage (i.e., before the bottom surface of the inner liner plate 22 abuts against the workpiece and nut), the nut 2 of this application is no different from a regular nut 2 during installation, which facilitates the installation operation for workers.
[0046] In some examples, a first abutment surface 231 is formed at the junction of the threaded hole 23 and the tapered cavity 210, and the first abutment surface 231 is horizontal. A second abutment surface 241 is formed at the junction of the circular hole 24 and the tapered cavity 210, and the first abutment surface 231 is horizontal and has a smooth surface.
[0047] For example, such as Figure 2 and Figure 6 As shown, the distance between the first abutment surface 231 and the second abutment surface 241 is set according to the length of the inner liner 22 and the actual required sliding stroke, ensuring that the inner liner 22 can slide sufficiently to achieve the clamping function without slipping out of the tapered cavity 210 due to excessive sliding. When the nut 2 is not screwed on, the inner liner 22 is pressed against the second abutment surface 241. Due to the presence of the second abutment surface 241, the inner liner 22 will not slip off from the outer cylinder 21. Similarly, when the inner liner 22 moves upward, due to the presence of the first abutment surface 231, the inner liner 22 will not slip off from the outer cylinder 21.
[0048] The first contact surface 231 and the second contact surface 241 limit the sliding range of the inner liner 22, and at the same time prevent the inner liner 22 from slipping off the outer cylinder 21, and also facilitate the normal transportation of the nut 2.
[0049] In some examples, each inner liner 22 has an internal thread 220, and the inner liner 22 is threadedly connected to the bolt 1 through the internal thread 220; the bottom of the inner liner 22 has a protrusion 221, which penetrates the circular hole 24, and the bottom surface of the protrusion 221 is located outside the bottom surface of the circular hole 24. After the protrusion 221 abuts against the nut or workpiece of the bolt 1, the protrusion 221 can move into the tapered cavity 210 so that the inner liner 22 can move along the tapered cavity 210.
[0050] For example, such as Figure 2 As shown, when installing nut 2, as nut 2 is tightened, the protrusion 221 at the bottom of the inner liner 22 gradually approaches the nut of bolt 1 or the workpiece below it. When the protrusion 221 contacts the nut or workpiece, continuing to tighten nut 2 will cause the protrusion 221 to be subjected to an upward reaction force, causing the protrusion 221 to move into the converging cavity 210. Since the protrusion 221 and the inner liner 22 are an integral structure, the movement of the protrusion 221 causes the inner liner 22 to slide upward in the converging cavity 210, thereby causing the inner liner 22 to move closer to each other and tightly clamp bolt 1.
[0051] The inner liner 22 is connected to the bolt 1 via an internal thread 220, which greatly enhances the tightness of the connection and further improves the anti-loosening capability of the component. The protrusion 221 makes full use of the force generated during the installation process, converting the force generated by tightening the nut 2 into the power for the inner liner 22 to clamp the bolt 1, thus realizing the function of the inner liner 22 automatically clamping the bolt 1. Not only is the operation simple and convenient, but the anti-loosening effect is also significantly improved, effectively ensuring the reliability of the connection in working environments with frequent vibration.
[0052] In some examples, a number of limiting grooves 211 are uniformly provided on the inner wall of the tapered cavity 210 along the axial direction. The number of limiting grooves 211 is the same as the number of inner liner plates 22. The limiting grooves 211 can also prevent the inner liner plates 22 from falling off the inner wall of the tapered cavity 210.
[0053] For example, such as Figure 2 As shown, during installation, when the inner liner 22 begins to slide within the tapered cavity 210, the slider 25 on the back side moves synchronously along the limiting groove 211. This effectively ensures that the inner liner 22 slides within the tapered cavity 210, avoiding possible offset or rotation during the sliding process. It also ensures that the inner liner 22 can apply a uniform clamping force when clamping the bolt 1, preventing uneven clamping force caused by positional deviation of the inner liner 22, thus greatly improving the reliability of the assembly.
[0054] In some examples, a spring sheet 3 is also provided between the first abutment surface 231 and the top of the inner liner 22. The spring sheet 3 is used to press the inner liner 22 so that the protrusion 221 extends to the outside of the circular hole 24.
[0055] The spring plate 3 is typically made of high-strength spring steel and undergoes a special heat treatment process, giving it excellent elasticity and fatigue resistance. The spring plate 3 is C-shaped to ensure uniform pressure is applied to each inner liner plate 22. In its natural state, the spring plate 3 is under a certain degree of compression, and the resulting elastic force continuously acts on the inner liner plate 22, causing the protrusion 221 at the bottom of the inner liner plate 22 to extend to the outside of the circular hole 24, preparing for subsequent installation and clamping operations.
[0056] Specifically, before installing nut 2, spring plate 3 is pre-installed and compressed, continuously applying downward pressure to inner liner plate 22, causing the protrusion 221 at the bottom of inner liner plate 22 to protrude from the bottom surface of circular hole 24. When nut 2 is installed and tightened, as nut 2 moves downward, the inner liner plate 22 moves upward when the protrusion 221 is subjected to compressive force, and spring plate 3 is compressed. After nut 2 is tightened to the correct position, the elastic force of spring plate 3 remains, continuously acting on inner liner plate 22 to provide preload force, helping inner liner plate 22 maintain a tight clamping state to bolt 1.
[0057] In some examples, the top edge of the inner liner has a bevel 201, which cooperates with the inner wall of the tapered cavity 210 to form an anti-detachment groove 26, and the spring sheet 3 has an outward expansion 31 located within the anti-detachment groove 26.
[0058] For example, such as Figure 7 and Figure 8 As shown, the anti-detachment groove 26 can provide a stable placement space for the spring sheet 3.
[0059] In some examples, the spring sheet 3 has a receiving space 32, and a rubber body 4 is disposed in the receiving space 32 to support the spring sheet 3.
[0060] For example, the rubber body 4 is a rubber ring or a rubber block, which can significantly enhance the elastic performance of the spring plate 3. The rubber body 4 enables the spring plate 3 to maintain a stable preload during long-term use, continuously providing a reliable preload to the inner liner plate 22 even under frequent vibration, impact, and other complex external forces. This further improves the anti-loosening effect of the assembly in vibration environments and extends the service life of the spring plate 3 and the entire nut 2.
[0061] In some examples, the sidewall of the protrusion 221 is provided with a slot 223, and the outer cylinder 21 has a mounting groove 212 near the protrusion 221. The mounting groove 212 is perpendicular to the axial direction of the outer cylinder 21. An elastic locking member 100 is provided in the mounting groove 212 and engages with the slot 223. The elastic locking member 100 includes a push rod 5 and a spring 6. The push rod 5 is slidably disposed in the mounting groove 212. The push rod 5 has a locking tooth 501 near the slot 223 and engages with the slot 223. The spring 6 is disposed in the mounting groove 212. One end of the spring 6 abuts against the push rod 5, and the other end of the spring 6 abuts against the inner wall of the mounting groove 212. The spring 6 is used to press the locking tooth 501 into the slot 223.
[0062] For example, such as Figure 9 As shown, the spring 6 is installed in the mounting groove 212, with one end tightly abutting against the push rod 5 and the other end fixed to the inner wall of the mounting groove 212. In its natural state, the spring 6 has a certain amount of pre-compression, which can ensure that the locking teeth 501 on the push rod 5 always have a tendency to extend outward.
[0063] When the protrusion 221 at the bottom of the inner liner 22 moves to the position corresponding to the mounting groove 212 as the nut 2 is screwed on, the push rod 5 slides outward along the mounting groove 212 under the action of the spring 6, and the push rod 5 engages with the corresponding groove 223 of the protrusion 221. Once the locking teeth 501 engage with the grooves 223, an effective lock is formed, restricting the movement of the protrusion 221. Since the protrusion 221 and the inner liner 22 are an integral structure, the restriction of the movement of the protrusion 221 further fixes the position of the inner liner 22, enhancing the clamping effect on the inner liner 22.
[0064] After the nut 2 is tightened, the elastic retainer 100 further prevents the inner liner 22 from loosening, improving the stability and reliability of the entire assembly under vibration. Compared to relying solely on the cooperation between the inner liner 22 and the tapered cavity 210, the addition of the elastic retainer 100 significantly enhances the assembly's anti-loosening capability, enabling it to better adapt to various complex and harsh working conditions.
[0065] In some examples, the mounting hole is a through-hole structure, facilitating the installation and removal of the various components of the elastic clip 100. Besides the push rod 5 and spring 6, the elastic clip 100 also includes a push rod 7 and an inner plug 8. These are detachably mounted within the mounting groove 212. The end of the spring 6 furthest from the groove 223 abuts tightly against the push rod 7, transmitting the spring force of the spring 6 through the push rod 7. The inner plug 8 is also detachably mounted within the mounting groove 212. The end of the push rod 7 furthest from the spring 6 abuts against the inner plug 8. The function of the inner plug 8 is to seal the mounting groove 212, preventing external dust and debris from entering, while also providing stable support for the push rod 7. The inner plug 8 is generally made of rubber or plastic, possessing a certain degree of elasticity and sealing properties.
[0066] For example, such as Figure 9 As shown, when installing the elastic clip 100, first place the spring 6 and the push rod 5 into the mounting groove 212, at which point the spring 6 is in its natural state. Next, place the push rod 7 into the mounting groove 212, with one end abutting against the spring 6. Then, apply a certain pressure to the inner plug 8, slowly pressing the inner plug 8 into the mounting groove 212. As the inner plug 8 goes deeper, the spring 6 is gradually compressed, and the locking teeth 501 on the push rod 5 protrude from the mounting groove 212. When the protrusion 221 at the bottom of the inner liner 22 moves to the appropriate position, the locking teeth 501 smoothly engage with the slot 223. When it is necessary to disassemble the elastic clip 100, first use a tool to remove the inner plug 8, and then remove the push rod 7, spring 6, and push rod 5 in sequence. The operation is simple and convenient.
[0067] The installation and disassembly of the elastic clamp 100 are improved, greatly facilitating equipment maintenance and replacement. During routine equipment maintenance, maintenance personnel can quickly disassemble and install the elastic clamp 100. Simultaneously, the cooperation between the push rod 7 and the inner plug 8 further ensures the stability of the elastic clamp 100, guaranteeing that it can effectively fix the inner liner plate 22 during equipment operation, thus improving the practicality and reliability of the component.
[0068] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.
Claims
1. A locking bolt and nut assembly, comprising a bolt (1) and a nut (2), characterized in that, The nut (2) includes: The outer cylinder (21) has a tapered cavity (210) whose diameter gradually decreases along the axial direction, and the bottom of the tapered cavity (210) has a second abutment surface (241). The inner lining plate (22) is a plurality of such plates, each of which is slidably disposed on the inner wall of the tapered cavity (210) along the axial direction of the tapered cavity (210), and the bottom end of the inner lining plate (22) abuts against the second abutment surface (241). The plurality of inner lining plates (22) are arranged in a circle. After sliding along the tapered cavity (210), the inner lining plate (22) slides away from the second abutment surface (241). The tapered cavity (210) is used to guide adjacent inner lining plates (22) to move closer to each other so that the inner lining plate (22) clamps the bolt (1). The outer cylinder (21) has a threaded hole (23) at the top, and the outer cylinder (21) is threadedly connected to the bolt (1) through the threaded hole (23); The outer cylinder (21) has a circular hole (24) at the bottom. The circular hole (24) and the threaded hole (23) are coaxially arranged with the tapered cavity (210) and communicate with each other. A first abutting surface (231) is formed between the threaded hole (23) and the tapered cavity (210). The first abutting surface (231) is used to limit the top of the inner liner (22). A second abutting surface (241) is formed between the circular hole (24) and the tapered cavity (210). The second abutting surface (241) is used to limit the bottom of the inner liner (22). Each of the inner lining plates (22) has an internal thread (220), and the inner lining plate (22) is threadedly connected to the bolt (1) through the internal thread (220); The inner liner (22) has a protrusion (221) at the bottom, the protrusion (221) penetrates the circular hole (24), and the bottom surface of the protrusion (221) is located outside the bottom surface of the circular hole (24). The protrusion (221) can abut against the nut of the bolt (1) or the workpiece and drive the inner liner (22) to move along the tapered cavity (210).
2. The anti-reverse bolt and nut assembly according to claim 1, characterized in that, The inner wall of the tapered cavity (210) has several axially oriented limiting grooves (211), and each inner liner plate (22) is provided with a slider (25) on its outer side, and each slider (25) is slidably disposed in one of the limiting grooves (211).
3. The anti-reverse bolt and nut assembly according to claim 1, characterized in that, A spring sheet (3) is also provided between the first contact surface (231) and the top of the inner liner (22), the spring sheet (3) being used to press the inner liner (22) so that the protrusion (221) extends to the outside of the round hole (24).
4. The anti-reverse bolt and nut assembly according to claim 3, characterized in that, The inner lining plate (22) has a slope (201) at the top edge. The slope (201) cooperates with the inner wall of the tapered cavity (210) to form an anti-detachment groove (26). The spring plate (3) has an outward expansion (31) located inside the anti-detachment groove (26).
5. A non-retractable bolt and nut assembly according to claim 3, characterized in that, The spring sheet (3) has a receiving space (32), and a rubber body (4) is provided in the receiving space (32). The rubber body (4) is used to support the spring sheet (3).
6. The anti-reverse bolt and nut assembly according to claim 1, characterized in that, The side wall of the protrusion (221) is provided with a slot (223), and the outer cylinder (21) has a mounting groove (212) near the protrusion (221). An elastic locking member (100) is provided in the mounting groove (212), and the elastic locking member (100) engages with the slot (223). The elastic locking member (100) includes: The push rod (5) is slidably disposed in the mounting groove (212). The push rod (5) has a locking tooth (501) near the slot (223), and the locking tooth (501) engages with the slot (223). A spring (6) is disposed in the mounting groove (212). One end of the spring (6) abuts against the push rod (5), and the other end of the spring (6) abuts against the inner wall of the mounting groove (212). The spring (6) is used to press the locking tooth (501) against the locking groove (223).
7. A non-retractable bolt and nut assembly according to claim 6, characterized in that, The mounting groove (212) is a through hole, and the elastic clip (100) further includes: The top rod (7) is detachably installed in the mounting groove (212), and the end of the spring (6) away from the slot (223) abuts against the top rod (7); The inner plug (8) is detachably disposed in the mounting groove (212). The end of the push rod (7) away from the spring (6) abuts against the inner plug (8). The inner plug (8) is used to seal the mounting groove (212) and support the push rod (7).