High-strength composite anti-loose structure bolt for high-speed rail main shaft

Abstract

The invention belongs to the technical field of bolt fasteners for high-speed rail spindles, and discloses a high-strength composite anti-loosening structure bolt for a high-speed rail spindle, which comprises a nut I. A cylinder is fixedly mounted at the bottom of the nut I. A bolt is fixedly mounted at the bottom of the cylinder, and an anti-loosening mechanism I is arranged in the cylinder. A first anti-loosening mechanism is arranged on the outer wall of the bolt, a second anti-loosening mechanism is arranged on the outer wall of the bolt, the first anti-loosening mechanism is used for connecting the fastening device and the hole groove to increase the locking force, and the second anti-loosening mechanism is used for assisting the first anti-loosening mechanism in secondary reinforcement. Through mutual cooperation of a cylinder, a rotating rod, a moving ring, a first protruding block, an arc-shaped block and other components, when loosening occurs, a pull ring is pulled to be away from a first nut, the cylinder is rotated to drive the rotating rod to move in the vertical direction, the moving ring can push the first protruding block, and therefore a moving block is driven to move outwards; and finally, the arc-shaped block is tightly attached to the interior of the main shaft part, the stability of the arc-shaped block is ensured, and looseness caused by external force is effectively prevented.

Description

Technical Field

[0001] The present invention belongs to the technical field of bolt fasteners for high - speed rail spindles, and specifically relates to a high - strength composite anti - loosening structure bolt for high - speed rail spindles. Background Technique

[0002] The background technique of the high - strength composite anti - loosening structure bolt for high - speed rail spindles mainly involves the fastening connection technology of high - speed rail, especially the connection of components with extremely high requirements for safety, stability, and reliability in high - speed rail equipment. As a high - speed and high - load transportation tool, key components such as the spindle, wheels, and bogies of high - speed rail need to be strongly fastened to ensure firmness and stability under conditions of high - speed operation, frequent vibration, and long - term use. Therefore, as the main connecting piece, the anti - loosening performance of bolts is particularly important.

[0003] There is now disclosed a bolt anti - loosening structure with the publication number CN118188684A, belonging to the technical field of fastener connections. It includes a bolt, and a deformation area is provided at the tail of the bolt; an anti - loosening fitting, with a protrusion provided at one end of the anti - loosening fitting, and the protrusion is adapted to the deformation area. The protrusion is used to cause the deformation area to deform to achieve the fixation between the workpiece and the fastened workpiece. The structure of the present invention is simple and convenient to use, and can achieve the anti - loosening function in blind holes.

[0004] However, in the application environment of high - speed rail, due to the influence of factors such as high - speed operation, temperature change, external force vibration, and continuous dynamic loading, the above - mentioned bolts may loosen during use, which will not only affect the connection stability of the high - speed rail spindle but also may cause potential safety hazards. Therefore, it is necessary to improve and optimize them. Summary of the Invention

[0005] To solve the problems raised in the above - mentioned background technique, the present invention provides a high - strength composite anti - loosening structure bolt for high - speed rail spindles.

[0006] To achieve the above - mentioned purpose, the present invention provides the following technical solution: A high - strength composite anti - loosening structure bolt for high - speed rail spindles, including a first nut, a cylinder is fixedly installed at the bottom of the first nut, a bolt is fixedly installed at the bottom of the cylinder, an anti - loosening mechanism one is arranged inside the cylinder, and an anti - loosening mechanism two is arranged on the outer wall of the bolt. The anti - loosening mechanism one is used to fasten the connection between the device and the hole groove, increasing the locking force, and the anti - loosening mechanism two is used to assist the anti - loosening mechanism one for secondary reinforcement;

[0007] The anti - loosening mechanism one includes a driving component and a moving component, where the driving component is used to control the locking degree of the device, and the moving component is used to actively adjust the locking degree between the device and the hole groove.

[0008] Preferably, the driving component includes a rotating rod rotatably installed on the inner wall of the bottom of the cylinder. Threads are provided on the outer wall of the rotating rod. The other end of the rotating rod is fixedly installed with a cylinder. A groove is provided at the top of the cylinder. By inserting a rotating tool into the groove and rotating the groove, the cylinder and the rotating rod are driven to rotate, providing power for the moving component.

[0009] Preferably, a moving ring is threadedly sleeved on the outer wall of the rotating rod. Four first bumps are fixedly installed on the outer wall of the moving ring. The four first bumps are evenly distributed around the axis of the rotating rod. The shapes of the four first bumps are trapezoidal, and the area value of the upper base is greater than that of the lower base. The inclined surface design of the inverted trapezoid of the first bump is used to drive the moving component to move.

[0010] Preferably, the driving component includes four first sliding grooves opened on the outer wall of the cylinder. The four first sliding grooves correspond to the corresponding first bumps respectively, and moving blocks are respectively slidably installed on the inner walls of the four first sliding grooves. Second sliding grooves are respectively opened on the inner sides of the four moving blocks. The four first bumps are respectively adapted to and slidably connected with the corresponding second sliding grooves.

[0011] Preferably, arc-shaped blocks are respectively fixedly installed on the other sides of the four moving blocks. The diameter value of the cylindrical cross-section formed when the four arc-shaped blocks gather is the same as the cross-section diameter value of the bolt. Threads are respectively provided on the outer sides of the four arc-shaped blocks and cover the entire outer walls of the arc-shaped blocks.

[0012] Preferably, the four moving blocks are elastically connected by two annular springs for recycling and resetting the four moving blocks.

[0013] Preferably, a first circular groove is opened at the center of the top of the first nut. The first circular groove is rotatably connected with the cylinder. A number of second circular grooves are circumferentially and evenly opened on the top of the first nut with the first circular groove as the center.

[0014] Preferably, a fixing block is provided on the top of the first nut. A second bump and a number of cylindrical grooves are fixedly installed at the bottom of the fixing block. The number of cylindrical grooves and the second bump are respectively slidably connected with the corresponding second circular grooves and the first circular groove. By inserting the fixing block into the first nut, the cylinder inside the first nut is limited to prevent it from moving due to external force.

[0015] Preferably, a pull ring is provided on the top of the fixing block, facilitating the user to install the fixing block.

[0016] Preferably, the second anti-loosening mechanism includes a second nut threadedly sleeved on the outer wall of the bolt. An installation groove is opened at the top of the second nut. A number of top blocks are provided above the installation groove. The number of top blocks and the inner wall of the installation groove are elastically connected by two springs respectively.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] Through the mutual cooperation of components such as a cylinder, a rotating rod, a moving ring, a first convex block, and an arc-shaped block, when loosening occurs, the staff can pull the pull ring away from the first nut and drive the rotating rod to move in the vertical direction by rotating the cylinder. The moving ring will push the first convex block, thereby driving the moving block to move outwards, and finally making the arc-shaped block closely fit the inside of the main shaft component to ensure its stability. This not only effectively prevents loosening caused by external forces, but also ensures the stability and safety of the system through the limiting mechanism, avoiding possible failures caused by misoperation or external force influence.

[0019] Through the cooperation of the first nut and the second nut, and by the contact of a number of top blocks with the high-speed rail main shaft component and the action of the springs, the loosening phenomenon of the high-speed rail main shaft component caused by external forces or vibrations during use is prevented. When the second nut slowly approaches the main shaft component, the top blocks compress the springs, and as the position of the second nut is confirmed, the springs rebound, making the top blocks closely fit the outer wall of the main shaft component. This design effectively ensures the firm connection between the fastener and the main shaft component, prevents the generation of gaps due to loosening, ensures the stability and safety of the high-speed rail main shaft component during high-speed operation, and further improves the anti-vibration performance and durability of the fastening system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 is an exploded structure diagram of the second nut, the top blocks, and the springs of the present invention;

[0022] Figure 3 is an exploded diagram of the fixed block and the first nut of the structure of the present invention;

[0023] Figure 4 is a partial sectional structure diagram of the first anti-loosening mechanism of the present invention;

[0024] Figure 5 is an exploded structure diagram of the first anti-loosening mechanism of the present invention;

[0025] Figure 6 is an exploded structure diagram of the cylinder and the first anti-loosening mechanism of the present invention;

[0026] Figure 7 is a partial structure diagram of the driving component of the present invention;

[0027] Figure 8 is a partial structure diagram of the first anti-loosening mechanism of the present invention.

[0028] In the figure: 1. First nut; 101. First circular groove; 102. Second circular groove; 2. Cylinder; 201. First sliding groove; 3. Bolt; 4. Rotating rod; 401. Thread; 5. Cylinder; 501. Groove; 6. Moving ring; 601. First convex block; 7. Moving block; 71. Second sliding groove; 701. Arc-shaped block; 702. Annular spring; 8. Fixed block; 801. Second convex block; 802. Cylindrical groove; 803. Pull ring; 9. Second nut; 901. Installation groove; 10. Top block; 1001. Spring. Specific implementation mode

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] As Figures 1 to 8 shown, the present invention provides a high-strength composite anti-loosening structure bolt for a high-speed rail main shaft, including a first nut 1,

[0031] A cylinder 2 is fixedly installed at the bottom of the first nut 1, a bolt 3 is fixedly installed at the bottom of the cylinder 2, a first anti-loosening mechanism is arranged inside the cylinder 2, and a second anti-loosening mechanism is arranged on the outer wall of the bolt 3. The first anti-loosening mechanism is used to fasten the connection between the device and the hole groove and increase the locking force, and the second anti-loosening mechanism is used to assist the first anti-loosening mechanism for secondary reinforcement;

[0032] The first anti-loosening mechanism includes a driving component and a moving component. Among them, the driving component is used to control the locking degree of the device, and the moving component is used to actively adjust the locking degree between the device and the hole groove. The driving component includes a rotating rod 4 rotatably installed on the inner wall of the bottom of the cylinder 2. Threads 401 are provided on the outer wall of the rotating rod 4. The other end of the rotating rod 4 is fixedly installed with a cylinder 5. A groove 501 is provided at the top of the cylinder 5. By inserting a rotating tool into the groove 501 and rotating the groove 501, the cylinder 5 and the rotating rod 4 are driven to rotate, providing power for the moving component. A moving ring 6 is threadedly sleeved on the outer wall of the rotating rod 4. Four first convex blocks 601 are fixedly installed on the outer wall of the moving ring 6. The four first convex blocks 601 are all designed to be equidistantly distributed around the axis of the rotating rod 4. The shapes of the four first convex blocks 601 are trapezoidal, and the area of the upper base is greater than the area of the lower base. The inclined surface design of the inverted trapezoid of the first convex block 601 is used to drive the moving component to move.

[0033] Adopting the above solution: The fastening effect between the bolt 3 and its connecting parts is realized through the cooperation of the driving component and the moving component. Through the rotation of the rotating rod 4 in the driving component, the locking degree of the entire anti-loosening mechanism can be controlled. The cooperation between the external thread 401 of the rotating rod 4 and the moving ring 6 enables the moving ring 6 to be effectively pushed to move along the axis of the rotating rod 4 when the rotating rod 4 is rotated, thereby driving the first convex block 601 to move together. The first convex block 601 is designed as an inverted trapezoid, and its upper bottom area is larger than the lower bottom area. The cooperation between the inclined surface on one side of the convex block and the bottom structure can generate a driving force during the movement, so as to actively adjust the locking degree between the device and the hole groove. Under the action of the inclined surface design, the first convex block 601 can effectively drive the moving ring 6 to move axially along the rotating rod 4 by contacting the corresponding hole groove wall surface. Since the first convex block 601 has a trapezoidal structure, the external inclined surface enables the moving ring 6 to not only maintain stable sliding during rotation, but also increase the locking force and effectively reduce the influence of vibration and friction on loosening. When the rotating rod 4 rotates, through the cooperation with the moving ring 6, the torque generated between the inside and outside of the first convex block 601 will further strengthen the fastening effect on the bolt 3 and the connecting parts, and can maintain the stability of the connecting parts for a long time, avoiding loosening caused by external forces or mechanical vibrations;

[0034] Through the auxiliary effect of the anti-loosening mechanism two, the anti-loosening effect is further enhanced. The design of the anti-loosening mechanism two can play a role in secondary reinforcement to prevent loosening caused by vibration, temperature change or external interference during long-term use. Therefore, the anti-loosening mechanism two not only works synergistically with the anti-loosening mechanism one in terms of structure, but also can achieve double protection for the system during the fastening process, significantly improving the overall anti-loosening effect and enhancing the stability and safety of the system.

[0035] Such as Figures 3 to 8As shown in the figure, the driving component includes four first sliding grooves 201 formed on the outer wall of the cylinder 2. The four first sliding grooves 201 respectively correspond to the corresponding first bumps 601, and moving blocks 7 are respectively and slidably installed on the inner walls of the four first sliding grooves 201. Second sliding grooves 71 are respectively formed on the inner sides of the four moving blocks 7 facing inward. The four first bumps 601 respectively match and are slidably connected to the corresponding second sliding grooves 71. Arc-shaped blocks 701 are respectively and fixedly installed on the other sides of the four moving blocks 7. The diameter value of the cylindrical cross-section formed when the four arc-shaped blocks 701 gather is the same as the cross-section diameter value of the bolt 3. Threads are respectively formed on the outer sides of the four arc-shaped blocks 701 and cover the outer walls of the entire arc-shaped blocks 701. The four moving blocks 7 are elastically connected by two annular springs 702 for recycling and resetting the four moving blocks 7. A first circular groove 101 is formed at the center of the top of the first nut 1. The first circular groove 101 is rotatably connected to the cylinder 5. A number of second circular grooves 102 are equidistantly formed on the top of the first nut 1 in a circumferential manner with the first circular groove 101 as the center. A fixing block 8 is arranged on the top of the first nut 1. A second bump 801 and a number of cylindrical grooves 802 are fixedly installed at the bottom of the fixing block 8. The number of cylindrical grooves 802 and the second bump 801 are respectively slidably connected to the corresponding second circular grooves 102 and the first circular groove 101. By inserting the fixing block 8 into the first nut 1, the cylinder 5 inside the first nut 1 is limited to prevent it from moving due to external forces. A pull ring 803 is arranged on the top of the fixing block 8, which is convenient for the user to install the fixing block 8.

[0036] Adopting the above scheme: The precise positioning and sliding of each moving block 7 are realized through the cooperation between the four first sliding grooves 201 and the corresponding first bumps 601, ensuring the smoothness and responsiveness of the overall driving system. The moving blocks 7 installed on the inner walls of each first sliding groove 201 can effectively reduce the friction during the sliding process, thereby improving the overall efficiency and service life of the system;

[0037] The cooperation between the second sliding grooves 71 provided on the four moving blocks 7 and the first bump 601 enables each moving block 7 to maintain stable positioning during movement, avoiding unnecessary displacement or imbalance of components during operation, which helps to achieve higher-precision control. Especially during the cooperation between the second sliding grooves 71 opened on the inward side and the first bump 601, the accuracy of the moving block 7 during return can be ensured, preventing return failure or deviation caused by component loosening. The design that the diameter value of the cylindrical cross-section formed when the arc-shaped blocks 701 gather is the same as the cross-section diameter value of the bolt 3 can ensure the tight cooperation of each component during connection, increasing the stability of the system and the ability to resist external forces. At the same time, the thread setting on the outer side of the arc-shaped blocks 701 ensures the firm connection and smooth operation between components. The four moving blocks 7 are elastically connected by two annular springs 702 to achieve the recovery and reset of the moving blocks 7. The circular groove 101 at the center of the top of the first nut 1 is rotatably connected to the cylinder 5. At the same time, multiple circular grooves 102 at the top of the first nut 1 are evenly distributed, which enables the system to maintain uniform force and precise movement trajectory in all directions. In addition, the design of the fixed block 8, in cooperation with the cylindrical groove 802 and the second bump 801 and the inner part of the first nut 1, realizes the effective limit of the cylinder 5, preventing unnecessary displacement of the cylinder 5 due to external interference and ensuring the overall stability of the system. The pull ring 803 provided at the top of the fixed block 8 improves the installation convenience of the components, enabling the operator to easily complete the installation of the fixed block 8 during installation and effectively restricting and stabilizing other components through the fixed block 8, thereby further improving the use convenience and stability of the overall system.

[0038] As Figures 1 to 2 shown, the second anti-loosening mechanism includes a second nut 9 threadedly sleeved on the outer wall of the bolt 3. An installation groove 901 is opened at the top of the second nut 9, and several top blocks 10 are arranged above the installation groove 901. The several top blocks 10 and the inner wall of the installation groove 901 are elastically connected by two springs 1001 respectively.

[0039] Adopting the above solution: The second nut 9 and the bolt 3 are tightly combined: The second nut 9 is sleeved on the outer wall of the bolt 3. Through the cooperation of the threads, the second nut 9 can be tightly fixed to the bolt 3, ensuring the reliable connection between components and preventing loosening caused by external forces or vibrations;

[0040] The cooperation between the installation groove 901 and the top blocks 10: The installation groove 901 at the top of the second nut 9 is ingeniously designed and cooperates with several top blocks 10. The top blocks 10 are located on the inner wall of the installation groove 901, and multiple springs 1001 are arranged above them for elastic connection, enabling the top blocks 10 to maintain flexibility when the second nut 9 is subjected to external forces and keeping the close contact between the top blocks 10 and the high-speed rail spindle components through elastic recovery, thereby effectively preventing the loosening or falling off of the second nut 9;

[0041] Function of spring 1001: The spring 1001 has an important buffering function. When external factors such as vibration and load change cause the second nut 9 to have a slight displacement, the spring 1001 can quickly return to its original position, ensuring that the top block 10 always maintains an effective support for the high-speed rail spindle component. This structure effectively improves the anti-loosening effect. Especially in environments such as high-speed rail and machinery with high-speed operation or high load, it can work stably for a long time, avoiding common mechanical failures or safety hazards caused by loosening.

[0042] Remarkable anti-loosening effect: Due to the elastic action provided by the spring 1001, the top block 10 can continuously adjust the contact pressure with the high-speed rail spindle component, ensuring a more firm connection between the components. It has better adaptability compared with traditional anti-loosening structures and can automatically adjust to adapt to different degrees of external vibration and pressure changes, providing a more stable and reliable fixing effect, which is particularly crucial in high-speed mechanical systems.

[0043] Working principle and usage process of the present invention:

[0044] The first nut 1, the cylinder 2 and the bolt 3 form a whole. First, the staff picks up the first nut 1, aligns the bolt 3 with the hole slot on the high-speed rail spindle component to be connected, and uses a tool to rotate the first nut 1. By driving the cylinder 2 and the bolt 3 to rotate through the first nut 1, then on the back of the high-speed rail spindle component, the second nut 9 is threadedly connected to the bolt 3 using a tool, so that the high-speed rail spindle component is fixed in the middle by the first nut 1 and the second nut 9. During the process of the second nut 9 slowly approaching the high-speed rail spindle component, several top blocks 10 first come into contact with the high-speed rail spindle component and compress the spring 1001 as the second nut 9 moves. When the second nut 9 is in place, the spring 1001 rebounds, making several top blocks 10 closely fit the outer wall of the high-speed rail spindle component, preventing gaps and loosening of the fasteners.

[0045] If external force occurs or after long-term use, the arc-shaped block 701 becomes loose at the threaded part of the high-speed rail main shaft component. First, pull the pull ring 803 to drive the fixed block 8 away from the first nut 1, and then insert a tool into the groove 501 and rotate the cylinder 5. The rotation of the cylinder 5 drives the rotating rod 4 to rotate. Due to the threaded connection between the moving ring 6 and the thread 401, the rotation of the rotating rod 4 is converted into the vertical movement of the moving ring 6 along the axis of the rotating rod 4. Through the sliding connection between the first convex block 601 and the arc-shaped block 701, when the first convex block 601 gets closer and closer to the bolt 3, due to the trapezoidal design of the first convex block 601, when the first convex block 601 is moving, it will push the four moving blocks 7 to move outward, and drive the arc-shaped block 701 to move together through the moving blocks 7, so as to be able to fit and clamp with the inside of the loose high-speed rail main shaft component to achieve the fastening effect. Then, in order to prevent the cylinder 5 from rotating accidentally, align the second convex block 801 on the outer wall of the fixed block 8, the cylindrical groove 802, the second circular groove 102 and the groove 501, so that the fixed block 8 is inserted into the first nut 1 and the cylinder 5 to limit the first nut 1 and the cylinder 5.

[0046] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprises", "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion, such that a process, method, article or apparatus comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or apparatus.

[0047] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-strength composite anti-loosening structural bolt for a high-speed railway main shaft, characterized in that: Includes nut one (1), A cylinder (2) is fixedly mounted on the bottom of the nut (1), a bolt (3) is fixedly mounted on the bottom of the cylinder (2), an anti-loosening mechanism (1) is arranged inside the cylinder (2), an anti-loosening mechanism (2) is arranged on the outer wall of the bolt (3), the anti-loosening mechanism (1) is used for fastening the connection between the device and the hole groove to increase the locking force, and the anti-loosening mechanism (2) is used for assisting the anti-loosening mechanism (1) to perform secondary reinforcement; The anti-loosening mechanism 1 includes a driving component and a moving component, wherein the driving component is used to control the locking degree of the device, and the moving component is used to actively adjust the locking degree between the device and the hole groove.

2. The high-strength composite anti-loosening structural bolt for high-speed railway main shaft according to claim 1 is characterized in that: The driving assembly comprises a rotating rod (4) rotatably mounted on the inner wall of the bottom of the cylinder (2); a thread (401) is provided on the outer wall of the rotating rod (4); a cylinder (5) is fixedly mounted on the other end of the rotating rod (4); a groove (501) is provided on the top of the cylinder (5); a rotating tool is inserted into the groove (501) and the groove (501) is rotated, thereby driving the cylinder (5) and the rotating rod (4) to rotate, thereby providing power for the moving assembly.

3. The high-strength composite anti-loosening structural bolt for high-speed railway main shaft according to claim 2 is characterized in that: A moving ring (6) is threadedly sleeved on the outer wall of the rotating rod (4), and four protrusions (601) are fixedly installed on the outer wall of the moving ring (6). The four protrusions (601) are designed to be distributed at equal distances with the axis of the rotating rod (4) as the center of the circle. The four protrusions (601) are designed to be trapezoidal in shape and the upper base area value is greater than the lower base area value. The inverted trapezoidal inclined surface of the protrusion (601) is designed to drive the moving component to move.

4. The high-strength composite anti-loosening structural bolt for high-speed railway main shaft according to claim 3 is characterized in that: The driving assembly comprises four sliding grooves (201) formed on the outer wall of the cylinder (2), the four sliding grooves (201) respectively corresponding to the corresponding protrusions (601), and a moving block (7) is slidably mounted on the inner wall of each sliding groove (201), a sliding groove (71) is formed on the inner side of the four moving blocks (7), and the four protrusions (601) are respectively matched with and slidably connected to the corresponding sliding grooves (71).

5. The high-strength composite anti-loosening structural bolt for high-speed railway main shaft according to claim 4 is characterized in that: The other sides of the four moving blocks (7) are respectively fixedly mounted with arc blocks (701); the diameter value of the cylindrical cross section formed when the four arc blocks (701) are gathered together is the same as the cross-sectional diameter value of the bolt (3); and the outward sides of the four arc blocks (701) are respectively provided with threads which cover the entire outer wall of the arc blocks (701).

6. The high-strength composite anti-loosening structural bolt for high-speed railway main shaft according to claim 5 is characterized in that: The four moving blocks (7) are elastically connected via two annular springs (702) for recovering and resetting the four moving blocks (7).

7. The high-strength composite anti-loosening structural bolt for high-speed railway main shaft according to claim 1 is characterized in that: A circular groove (101) is provided at the center of the top of the nut (1), and the circular groove (101) is rotatably connected to the cylinder (5). A plurality of circular grooves (102) are provided at equal distances on the top of the nut (1) with the circular groove (101) as the center.

8. The high-strength composite anti-loosening structural bolt for high-speed railway main shaft according to claim 7 is characterized in that: A fixing block (8) is arranged on the top of the nut one (1), and a convex block two (801) and a plurality of cylindrical grooves (802) are fixedly installed on the bottom of the fixing block (8), and the plurality of cylindrical grooves (802) and the convex block two (801) are respectively slidably connected with the corresponding circular groove two (102) and circular groove one (101), and the fixing block (8) is inserted into the nut one (1) so as to limit the cylindrical body (5) inside the nut one (1) and prevent the cylindrical body (5) from moving due to external force.

9. The high-strength composite anti-loosening structural bolt for high-speed railway main shaft according to claim 8, characterized in that: A pull ring (803) is provided on the top of the fixing block (8) to facilitate the user to install the fixing block (8).

10. The high-strength composite anti-loosening structural bolt for high-speed railway main shaft according to claim 1, characterized in that: The second anti-loosening mechanism comprises a second nut (9) threadedly sleeved on the outer wall of the bolt (3); a mounting groove (901) is provided on the top of the second nut (9); a plurality of top blocks (10) are arranged above the mounting groove (901); and the plurality of top blocks (10) are elastically connected to the inner wall of the mounting groove (901) via two springs (1001).

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