A multi-redundant anti-loosening load-equalizing nut system based on double axial clamping and vibration energy conversion and an assembling method thereof

Abstract

The application provides a multiple-redundancy anti-loosening uniform load nut system based on biaxial counter-pressing and vibration energy conversion and an assembling method, which comprises an anti-loosening locking module and a standard nut; the anti-loosening locking module is used for cooperating with a bolt; the standard nut is used for cooperating with the bolt; when the anti-loosening locking module and the standard nut cooperate to lock a workpiece, biaxial counter-pressing is formed between the standard nut and the anti-loosening locking module. The application establishes a static mechanical balance of biaxial counter-pressing, and utilizes the rotation direction characteristics of the positive and reverse threads to lock the nut and intelligently convert the energy component leading to loosening in random transverse vibration into a driving force of dynamic enhanced locking force, so that a positive feedback anti-loosening mechanism of the tighter the better is realized.

Description

Technical Field

[0001] This invention relates to the field of mechanical fastener technology, and in particular to a multi-redundant anti-loosening load-equalizing nut system and assembly method based on biaxial alignment and vibration energy conversion. Background Technology

[0002] In fields such as construction machinery, rail transportation, and wind power generation, bolted connections are prone to loosening under continuous vibration, posing a major risk of equipment failure and safety accidents. Existing anti-loosening technologies can be mainly categorized as follows:

[0003] 1. Friction-based anti-loosening type: such as spring washers, double nuts, etc., rely on increased friction, but the effect is limited and it fails rapidly as the preload decreases.

[0004] 2. Structural locking type: such as nylon insert nuts, wedge thread nuts (such as Spirax), and eccentric counter-nuts (such as Hardlock). This type of solution achieves excellent anti-loosening through one-time structural interference, but its performance is static and unidirectionally decaying, unable to cope with infinite continuous vibration energy input, and failure may lead to connection collapse.

[0005] 3. Chemical locking type: such as threadlocking adhesive, which has the best effect but is for single use and is inconvenient to maintain.

[0006] The common flaw in existing anti-loosening technologies lies in their passive resistance logic, which involves designing a more robust static structure to absorb vibrational energy. Ultimately, this inevitably leads to failure due to energy accumulation (wear and loosening). Therefore, there is a lack of a fundamental anti-loosening solution that can actively utilize vibrational energy to maintain and enhance its locking state.

[0007] According to a study by Majzoobi et al. published in Proceedings of the Institution of Mechanical Engineers, Part C, for M20 and larger bolts subjected to axial loads, the first thread bears 58% of the total load on the threaded pair. This load distribution pattern causes the first thread to be under high stress for a long time, becoming the main cause of fatigue failure and creep loosening in threaded connections. Existing anti-loosening technologies (such as friction anti-loosening and mechanical locking anti-loosening) cannot change this load distribution. Their anti-loosening effect relies on the friction between the threaded pairs, but the friction will decay due to factors such as vibration, wear, and temperature, and cannot fundamentally solve the problem of overload on the first thread. Summary of the Invention

[0008] Purpose of the invention: To address the shortcomings of existing anti-loosening technologies and the uneven load distribution on threads, this invention proposes a multi-redundant anti-loosening load-equalizing nut system and assembly method based on biaxial alignment and vibration energy conversion. This system exhibits extremely high anti-loosening reliability under vibration and impact loads and can convert vibration energy into locking force, thus optimizing dynamic layered load distribution.

[0009] Technical solution: In the first aspect, the present invention proposes a multi-redundant anti-loosening load-equalizing nut system based on biaxial alignment and vibration energy conversion, comprising: an anti-loosening locking module and a standard nut; the anti-loosening locking module is used to cooperate with a bolt; the standard nut is used to cooperate with a bolt; when the anti-loosening locking module and the standard nut cooperate to lock the workpiece, a biaxial alignment is formed between the standard nut and the anti-loosening locking module.

[0010] Furthermore, the anti-loosening locking module includes a main nut and a reverse-thread locking nut; the main nut has internal and external threads, the internal thread mates with the bolt, and the external thread is in the opposite direction to the internal thread;

[0011] The reverse-tooth locking nut has an internal thread that mates with the external thread of the main nut; the external thread of the main nut is located on the lower side of the main nut.

[0012] Furthermore, the standard nut has an internal thread that mates with the bolt. When the standard nut is tightened, there is a gap between the standard nut and the main nut to ensure that there is no interaction force between the two.

[0013] Furthermore, the upper end face of the main body nut contacts the workpiece and applies the main preload force, and there is a gap between the lower end face of the main body nut and the upper end face of the standard nut. The external thread of the main body nut is located on the lower side of the main body nut, and the reverse thread locking nut and the external thread of the main body nut form a thread pair.

[0014] Furthermore, the upper end face of the standard nut contacts the lower end face of the reverse thread nut, and there is a gap between the upper end face of the standard nut and the lower end face of the main nut. The external thread of the main nut is located on the lower side of the main nut, and the reverse thread locking nut and the external thread of the main nut form a threaded pair.

[0015] Furthermore, assuming that when the reverse-threaded locking nut is tightened onto the main nut, the axial clamping force applied by the lower end of the reverse-threaded locking nut to the upper end of the standard nut is between the minimum value that ensures no slippage of the threaded pair and the maximum value that prevents plastic deformation of the bolt and nut materials.

[0016] Furthermore, the ratio of the axial clamping force to the preload applied to the workpiece by the main nut is between 0.3 and 0.7.

[0017] Furthermore, the main nut engages with the bolt via its internal thread, applying 50% to 70% of the total preload; the threaded pair formed by the external threads of the reverse-thread locking nut and the main nut applies 30% to 50% of the total preload.

[0018] Secondly, this invention proposes an assembly method for a multi-redundant anti-loosening load-equalizing nut system based on biaxial alignment and vibration energy conversion, comprising:

[0019] Step 1: The reverse-threaded locking nut is not locked onto the main nut;

[0020] Step 2: Screw the main nut into the bolt and tighten it with the workpiece. Then screw the standard nut into the bolt. Before the standard nut is finally tightened, there is a gap between the opposing end faces of the main nut and the standard nut.

[0021] Step 3: Tighten the reverse thread lock nut to apply an axial clamping force to the standard nut, forming a counter-clamping (the reverse thread nut and the main nut form a threaded connection, and their end faces do not contact each other), thus obtaining a multi-redundant anti-loosening load-equalizing nut system based on biaxial counter-clamping and vibration energy conversion.

[0022] Beneficial Effects: This invention establishes a bidirectional axial counter-rotating mechanical balance through a main nut with internal and external threads, a matching reverse-thread locking nut, and a standard nut. Utilizing the rotational characteristics of the positive and negative threads, the nut is locked in place. The energy component causing loosening during random lateral vibration is intelligently converted into a dynamically enhanced locking force, achieving a positive feedback anti-loosening mechanism that tightens with vibration. Simultaneously, this invention employs a functional separation design, providing triple redundancy in anti-loosening measures from static locking and intelligent locking to load-bearing preservation, ensuring absolute fail-safe characteristics. This invention fundamentally changes the logic of passive anti-loosening, providing an ultimate solution for critical connections under extreme vibration conditions. Furthermore, the load-sharing principle of this invention cleverly reduces the force on the first thread by 58% (M20 and above), eliminating the first thread as a weak point in the threaded connection. This is the first time in the history of threaded connection technology that true load distribution has been structurally achieved, making the leap in load-bearing capacity a natural physical law. Overall fatigue life is increased by 8 to 20 times. This invention represents a qualitative leap in bolt-nut connections. The overall performance of this invention is mainly based on structural locking and force-controlled locking, and it has extremely high immunity to precision requirements. Attached Figure Description

[0023] Figure 1 This invention presents a schematic diagram of the internal and external threaded main nut of a multi-redundant anti-loosening load-equalizing nut system based on biaxial alignment and vibration energy conversion;

[0024] Figure 2 This invention presents an installation diagram of a multi-redundant anti-loosening load-equalizing nut system based on biaxial alignment and vibration energy conversion. Detailed Implementation

[0025] The technical solution of this embodiment will now be further described in conjunction with the accompanying drawings and examples.

[0026] This invention proposes a multi-redundant anti-loosening load-equalizing nut system based on biaxial alignment and vibration energy conversion, mainly comprising: an anti-loosening locking module and a standard nut. The anti-loosening locking module is designed to cooperate with bolt 4 and apply a main preload F0. The standard nut 3 has a standard internal thread and cooperates with bolt 4, forming a rigid anchor body. Specifically, in this embodiment, the anti-loosening locking module includes a main nut 1 and a reverse-thread locking nut 2 that mates with the external thread of the main nut. The main nut 1 has internal and external threads; its internal thread 11 mates with bolt 4, and its external thread 12 is in the opposite direction to the internal thread 11. See details [link to relevant documentation]. Figure 1 In some embodiments, the main nut 1 is a grade 8 high-strength nut conforming to the Chinese national standard GB / T 6170-2005 ("Hexagonal Nuts") with its thickness reduced to half. The outer diameter is machined with M24 reverse threads. The main nut contacts the workpiece and applies the main preload force F0.

[0027] Correspondingly, in this embodiment, the reverse-thread locking nut 2 has an internal thread that mates with the external thread of the main nut 1. The reverse-thread locking nut is a grade 8 high-strength nut conforming to Chinese national standard GB6175.

[0028] For example, the main body nut M20 (GB6170 grade 8, obtained by machining an M24 reverse thread using a machine tool with half the thickness of the outer diameter) contacts the workpiece and applies a main preload force F0300 N.m. The standard nut M20 (GB6170 grade 8) is manually screwed until it fits against the main body nut, and finally the reverse thread locking nut M24 (GB6175 grade 8) is tightened, applying an axial tightening force F1200 N.m to the standard nut to form a counter-clamping force.

[0029] like Figure 2As shown, during installation, the reverse-threaded locking nut is not locked onto the main nut. The main nut is first pressed against the workpiece, and then the standard nut is screwed in. Before final tightening, there is a controlled micro-gap (Δ) between the opposing end faces of the main nut and the standard nut. For example, this controlled micro-gap is 2mm. Finally, by tightening the reverse-threaded locking nut, an axial tightening force F1 is applied to the standard nut, forming an opposing force. In the nut system of this embodiment, the axial tightening force F1 and the preload force F0 generated by the bolt tension and acting on the main nut form the total preload force. The total preload force and the resultant force of the axial tightening force F1 and the preload force F0 of the main nut acting on the main nut are opposite in direction and mutually balanced. Even if the main nut produces a vibration component with a counterclockwise loosening tendency, it is either crushed by F1 or absorbed and dissipated by the system structure. Through mechanical transmission, it is transformed into a tendency to drive the reverse-threaded locking nut to rotate slightly along its tightening direction, thereby dynamically maintaining or enhancing the axial tightening force F1. The tightening torque of the reverse-threaded locking nut is preset so that the value of the axial tightening force F1 is between the minimum value that ensures the threaded pair does not slip and the maximum value that prevents plastic deformation of the system component material. The ratio of the axial tightening force F1 to the preload F0 is between 0.3 and 0.7, with a lower limit of 0.5 for heavy loads. Once the axial tightening force F1 and the preload F0 are established, if the main nut attempts to loosen along the internal thread, this tendency will be blocked by the engagement between its reverse external thread and the reverse-threaded locking nut, resulting in a mechanical lock. In this embodiment of the invention, the anti-loosening function of the anti-loosening locking module and the load-bearing function of the main nut are physically and mechanically separated, ensuring that even in the event of extreme failure of the anti-loosening locking module, the connection pair formed by the main nut and the bolt remains effectively tightened.

[0030] For example, during assembly, the main nut is tightened to 60% ± 5% of the total preload, and the upper end face of the main nut presses against the connected part, establishing the main preload F0 (approximately 75kN for M20 / 8.8 grade). The standard nut is hand-tightened until it is flush with the lower end face of the reverse-threaded locking nut, with no axial pressure between them, only geometric alignment, without changing the preload. The reverse-threaded locking nut is then tightened, causing it to tend to move upward axially relative to the bolt. Because the lower end face of the reverse-threaded locking nut is locked by the standard nut, the displacement tendency is converted into a 50kN axial lifting force. The reverse-threaded locking nut applies a 50kN axial thrust to the main nut, forming a closed loop of internal forces. The lower end face of the reverse-threaded locking nut presses against the upper end face of the standard nut with a 50kN pressure, and the standard nut transmits the pressure to the bolt thread, causing local elastic compression of the bolt. That is, the tightening direction of the reverse thread lock nut is the same as its normal loosening direction (counterclockwise), but due to the thread direction design and end face constraint, this rotational action is converted into a self-balancing closed-loop force inside the system.

[0031] The anti-loosening mechanism of each nut will now be further explained.

[0032] For the main nut, its internal and external threaded surfaces simultaneously press against the bolt thread, with positive pressure covering the entire engagement section. This main nut is subjected to a downward axial thrust from the reverse-threaded locking nut through the reverse thread pair. For the main nut to rotate, the following conditions must be overcome simultaneously:

[0033] (1) The main nut moves downward, and this displacement needs to overcome the 50kN tension of the reverse-tooth locking nut.

[0034] (2) The main nut moves upward, and this displacement needs to overcome the 125kN support reaction force of the connected part.

[0035] (3) The axial rotation is constrained by the climbing angle and direction of the positive and negative threads respectively.

[0036] Axial displacements are geometrically mutually exclusive, and their forces are mutually inhibiting: neither upward nor downward movement of the main nut is possible. Therefore, the rotational degree of freedom of the main nut is physically reduced to zero.

[0037] For a reverse-threaded lock nut, which mates with the main nut, it withstands a downward axial thrust, and the lower end face of the reverse-threaded lock nut is rigidly opposed to the upper end face of the standard nut. Any torque attempting to move the reverse-threaded lock nut downwards will immediately trigger the following chain reaction: the tendency to loosen leads to an increase in the lifting force of the reverse-threaded nut, which increases the pressure on the end face, increases the frictional torque of the thread pair, increases the resistance torque to loosening, and ultimately the tendency to loosen is self-locked. This forms a dynamically stable self-locking steady state for the reverse-threaded lock nut. Any slight perturbation will cause it to revert to a "tighter" direction.

[0038] The Tang-style thread is statically interlocked by left- or right-handed nuts, with no dynamic gain. In contrast, the reverse-thread locking nut in this embodiment has positive feedback self-locking, and the disturbance is amplified into a locking force.

[0039] For a standard nut, its upper end face is pressed shut by the lower end face of a reverse-threaded locking nut with an axial pressure of 50kN, leaving its lower end face completely unsupported. The internal thread of the standard nut engages with the bolt, bearing the 50kN axial pressure. This axial pressure is transmitted from the end face pressure of the reverse-threaded locking nut through the nut body to the thread. When this 50kN axial pressure is applied to the bolt through the standard nut thread, the bolt undergoes axial elongation elastic deformation in that localized area (a tendency for the bolt to "elongate"). This elastic deformation effect generates a large, uniformly distributed positive pressure on the thread contact surface. Therefore, the standard nut is not prevented from loosening by "pressing against a fastener," but rather by the bolt's own elastic restoring force and the end face pressure of the reverse-threaded nut axially clamping its threaded joint.

[0040] When a standard nut attempts to loosen, a counter-clockwise torque is applied to the end face of the reverse-thread nut. The reverse thread self-locks, increasing the pressure on the end face and thus increasing friction. Therefore, the more force is applied, the tighter the reverse thread becomes, and the friction approaches infinity.

[0041] For a standard nut to loosen, a fixed counterforce fulcrum is needed to apply torque. In a traditional double-nut countersink configuration, this fulcrum is the upper nut's end face, meaning the upper nut is pressed down by the workpiece and remains stationary. In this embodiment, the counterpart to the upper end face is a reverse-threaded locking nut, which is not fixed but operates in a positive feedback self-locking cycle. Any torque attempting to drive the standard nut counterclockwise will, through end-face friction, drive the reverse-threaded locking nut counterclockwise (i.e., in the "tightening upwards" direction), making the system lock even tighter.

[0042] In this embodiment of the invention, the main nut mates with the bolt, applying 50% to 70% of the total preload. The threaded pair formed by the reverse-thread locking nut and the outer nut of the main nut is independently connected in parallel with the main nut, applying 30% to 50% of the total preload. This structure reduces the load proportion of the first thread of the main nut to between 58% × (50% to 70%) = 29% to 41%, meaning that the invention reduces the working stress of the first thread of the main nut by more than 40% compared to traditional connections. This stress reduction is a mathematical inevitability guaranteed by the fundamental laws of thread mechanics, rather than relying on material or process optimization. The 40% stress reduction increases the fatigue life of the main nut threaded pair by 300% to 500%. This load distribution ratio is precisely controlled by the system's geometric topology and installation torque, and is independent of the friction coefficient and surface roughness of the threaded pair, exhibiting high repeatability and long-term stability. Furthermore, the ultimate load-bearing capacity of the nut system of this invention is determined by the parallel connection of the main nut and the threaded pair. Under the same material grade, the static load-bearing capacity of this invention is increased by 67% (1 / 0.6 = 1.667) compared to a traditional single nut.

[0043] In summary, on the one hand, the system proposed in this embodiment of the invention achieves optimized load distribution between the two threaded pairs through sequential torque control and clearance control. On the other hand, the system proposed in this embodiment of the invention can directionally convert the lateral vibration energy acting on it: the vibration component that causes the main nut to loosen counterclockwise is absorbed and dissipated by the system structure; while the vibration component that causes the main nut to rotate clockwise is converted into a tendency to drive the reverse-thread locking nut to rotate slightly further along its tightening direction through mechanical transmission, thereby dynamically maintaining or enhancing the axial tightening force F1.

[0044] In some embodiments, the positions of the standard nut and the anti-locking module can be interchanged, as long as the reverse-threaded locking nut is located between the standard nut and the main nut. For example, the standard nut M20 (GB6170 grade 8) contacts the workpiece and applies a main preload force F0300 N.m. The main nut M20 (GB6170 grade 8, obtained by modifying half the thickness of the outer diameter to M24 reverse thread using a machine tool) is screwed to a distance of 2 mm from the standard nut, and finally the reverse-threaded locking nut M24 (GB6175 grade 8) is tightened, applying an axial clamping force F1200 N.m to the standard nut, forming a counter-clamping force.

[0045] In some embodiments, the standard nut can be replaced by an existing nut, such as a blind-hole bolt head. For example, the main nut engages with a reverse-thread nut, and the bolt enters the nut from the reverse-thread nut and is manually screwed until it fits. The entire bolt and nut are then inserted into the blind hole and screwed until the nut fits against the connector, with the main nut tightened to F0 300 N.m. Finally, the reverse-thread locking nut M24 (GB61758 grade) is tightened, applying an axial clamping force F1200 N.m to the bolt, forming a counter-clamping force.

[0046] The inventiveness of this invention and the resulting synergistic effects are concentrated in the following aspects:

[0047] (1) Geometric deadlock, eliminating rotational loosening: When the reverse-tooth locking nut is finally tightened, its tightening force F1 on the standard nut and the preload force F0 of the main nut form a self-balancing "static tension arch" in the system. This structure deprives the nut of the freedom of rotational loosening from a kinematic perspective, achieving the first level of anti-loosening.

[0048] (2) Intelligent sorting and conversion of vibration energy: The system can intelligently respond to the bidirectional torque of random vibration (taking the right-hand thread of a bolt as an example).

[0049] The energy of the counterclockwise torque that causes the main nut to loosen is absorbed and dissipated by the system structure ("turning bad things into nothing").

[0050] For clockwise torque, through mechanical transmission, it will drive the reverse-thread lock nut to produce a slight "thread creep" action, thereby dynamically increasing the top force F1, achieving "the more it vibrates, the tighter it becomes" ("bad things are reinforced"). This is a positive feedback loop, constituting the second level of active anti-loosening.

[0051] (3) Triple redundancy, fault-safe: This invention constructs a defense-in-depth system:

[0052] Level 1 (Static Locking): The main nut, which is geometrically locked with internal and external positive and negative teeth by the huge thread friction force generated by the top, has a loosening resistance that rivals the top static solution.

[0053] Level Two (Intelligent Lockout): If static lockout fails, the dynamic mechanism described above will take effect, and the system will approach a state of never loosening.

[0054] Level 3 (Bearing Preservation): Under extreme assumptions, the anti-loosening module completely fails, and the system degenerates into a standard high-strength connection composed of the main nut. It can still ensure that the connection does not collapse within a certain period of time, achieving the highest "fail-safe" level.

[0055] (4) The design of the inner and outer positive and negative teeth of the main body nut causes the main body nut to loosen along the inner thread. This movement trend will be locked by the reverse tooth locking nut on the outer thread to establish a tightening force F1 on the rigid anchor body, thus forming a mechanical lock.

[0056] (5) Active load-bearing optimization: By precisely controlling the preload distribution, the bolt load can be guided to be shared by the two sets of threaded pairs of the main nut and the rigid anchor body of the second nut, significantly reducing the specific pressure of a single thread tooth, improving uneven load distribution, and automatically compensating for the static attenuation of preload caused by factors such as material creep, embedment relaxation, and temperature changes, thus achieving stable performance of the connection throughout its service life. This fundamentally improves the fatigue life and static strength of the connection. An automatic compensation mechanism for achieving long-term dynamic stability of preload has been established.

[0057] (6) Controllable failure modes: Through design, the strength of the connected system can be matched to be higher than that of the threaded pair but slightly lower than that of the bolt shank, forcing potential failures to occur in the tensile fracture of the bolt shank, which is stronger and more predictable, rather than the unpredictable thread stripping, greatly improving safety and designability.

[0058] (7) High reliability and adaptability: The all-metal structure is resistant to high temperatures and aging, and its performance does not degrade over time. The rigid locking area provides the main line of defense against impacts, protecting the precise dynamic adjustment area, giving the system both extremely high strength and intelligence. The modular design can be flexibly matched with standard bolts of different strength grades.

[0059] (8) Non-destructive installation and strong compatibility: The system can be installed as an independent module at the tail of the existing standard bolt connection without replacing the original bolts and main nuts, which greatly reduces the upgrade cost and risk.

[0060] (9) Excellent engineering applicability and platform expansion potential:

[0061] Full lifecycle compatibility: The components of this invention can be directly screwed into ordinary threaded parts of the current national standard (GB) and international standard (ISO) for use. The upgrade cost for users is extremely low and the modification is simple.

[0062] Repeatability: It has the ability to be assembled, disassembled and used without damage, and its total life cycle cost and reliability are significantly better than most existing technologies.

[0063] Adaptability to harsh environments: Its performance is derived from the elasticity of metals, and its sensitivity to extreme environments such as temperature cycling, irradiation, and deep-sea high pressure is far lower than that of technologies that rely on polymers or chemical bonding.

[0064] Platform-based applications: As a general "mechanical interface optimization method", this technology can be widely used in: a) adjustment and locking mechanisms of precision optical / instrument equipment; b) load-bearing connections of heavy structures such as wind turbine main shafts and pressure vessel end caps; c) maintenance-free extreme environment connections such as aerospace vehicle compartments and implanted medical devices; d) power transmission and overload protection interfaces such as servo motor rotors and transmission splines.

Claims

1. A multi-redundant anti-loosening load-equalizing nut system based on biaxial alignment and vibration energy conversion, characterized in that: include: Anti-loosening locking module and standard nut; the anti-loosening locking module is used to mate with the bolt; the standard nut is used to mate with the bolt; When the anti-loosening locking module and the standard nut are used to lock the workpiece, the standard nut and the anti-loosening locking module form a bidirectional axial opposing force.

2. The multi-redundant anti-loosening load-equalizing nut system based on biaxial alignment and vibration energy conversion as described in claim 1, characterized in that: The anti-loosening locking module includes a main nut and a reverse-thread locking nut; the main nut has internal and external threads, the internal thread mates with the bolt, and the external thread is in the opposite direction to the internal thread. The reverse-tooth locking nut has an internal thread that mates with the external thread of the main nut; the external thread of the main nut is located on the lower side of the main nut.

3. The multi-redundant anti-loosening load-equalizing nut system based on biaxial alignment and vibration energy conversion according to claim 2, characterized in that: The standard nut has an internal thread that mates with the bolt, and when the standard nut is tightened, there is a gap between the standard nut and the main nut.

4. The multi-redundant anti-loosening load-equalizing nut system based on biaxial alignment and vibration energy conversion as described in claim 3, characterized in that: The upper end face of the main nut contacts the workpiece and applies the main preload force. There is a gap between the lower end face of the main nut and the upper end face of the standard nut. The external thread of the main nut is located on the lower side of the main nut. The reverse thread locking nut and the external thread of the main nut form a thread pair.

5. The multi-redundant anti-loosening load-equalizing nut system based on biaxial alignment and vibration energy conversion according to claim 3, characterized in that: The upper end face of the standard nut contacts the lower end face of the reverse thread nut, and there is a gap between the upper end face of the standard nut and the lower end face of the main nut. The external thread of the main nut is located on the lower side of the main nut, and the reverse thread locking nut and the external thread of the main nut form a thread pair.

6. The multi-redundant anti-loosening load-equalizing nut system based on biaxial alignment and vibration energy conversion according to claim 4, characterized in that: Assuming that when the reverse-threaded lock nut is tightened onto the main nut, the axial clamping force applied by the lower end of the reverse-threaded lock nut to the upper end of the standard nut is between the minimum value that ensures no slippage of the threaded pair and the maximum value that prevents plastic deformation of the bolt and nut materials.

7. A multi-redundant anti-loosening load-equalizing nut system based on biaxial alignment and vibration energy conversion as described in claim 6, characterized in that: The ratio of the axial clamping force to the preload applied to the workpiece by the main nut is between 0.3 and 0.

7.

8. A multi-redundant anti-loosening load-equalizing nut system based on biaxial alignment and vibration energy conversion as described in claim 2, characterized in that: The main nut engages with the bolt via its internal thread, applying 50% to 70% of the total preload; the threaded pair formed by the external threads of the reverse-thread locking nut and the main nut applies 30% to 50% of the total preload.

9. An assembly method for a multi-redundant anti-loosening load-equalizing nut system based on biaxial alignment and vibration energy conversion, characterized in that: include: Step 1: The reverse-threaded locking nut is not locked onto the main nut; Step 2: Screw the main nut into the bolt and tighten it with the workpiece. Then screw the standard nut into the bolt. Before the standard nut is finally tightened, there is a gap between the opposing end faces of the main nut and the standard nut. Step 3: Tighten the reverse-threaded locking nut to apply an axial clamping force to the standard nut, forming a counter-clamping, thus obtaining a multi-redundant anti-loosening load-equalizing nut system based on biaxial counter-clamping and vibration energy conversion as described in any one of claims 2 to 4.

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