Multi-stage flexible potential energy self-locking nut connecting piece, manufacturing method and using method

Abstract

The invention discloses a multistage flexible potential energy self-locking nut connecting piece and a manufacturing method and using method.The connecting piece comprises a locking spring and a nut body, the nut body comprises a screwing part and a wrenching part, a containing cavity matched with the locking spring is formed in the screwing part, a locking hole communicated with the containing cavity is formed in the side face of the screwing part, and the locking hole is communicated with the locking spring. A multi-stage locking groove is formed in the inner wall surface of the accommodating cavity; an inner threaded hole communicated with the containing cavity is formed in the wrenching part, the containing cavity and the threaded hole are coaxially arranged in the nut body, the locking spring is arranged in the containing cavity, the lower end of the locking spring is clamped in the multi-stage locking groove, and the upper end of the locking spring is located in the locking hole. The self-locking nut connecting piece and the manufacturing and using method have the advantages of being controllable in locking torque, free of damage to mounting bolts, smooth in assembly, capable of being repeatedly disassembled, free of attenuation of the locking torque, reliable in locking performance and the like, and are particularly suitable for the field of mechanical connection with high locking performance requirements and frequent disassembly.

Description

Technical Field

[0001] The present invention relates to the technical field of self-locking nut connectors, and particularly to a multi-stage flexible potential energy self-locking nut connector, a manufacturing method and a usage method thereof. Background Art

[0002] In modern product design, there is a trend towards intelligent design, functional design, minimum mass design and safety design. During the product design process, mechanical connection is an essential process. The anti-loosening safety and reliability of mechanical connection are one of the important indicators in the product design process. When the product moves smoothly, the mechanical connection relies on the friction force of the self-locking angle of the thread, the friction force generated by the positive pressure applied by the spring washer, and the residual pre-tightening force generated after the bolt and the nut are tightened, which can ensure the anti-loosening reliability of the mechanical connection. However, when used on products such as aircraft, locomotives, and submersibles with large working condition changes and unstable operation, the above-mentioned conventional mechanical connections cannot meet the anti-loosening reliability requirements of mechanical connections.

[0003] To solve the above technical problems, self-locking nuts with locking performance are commonly used in mechanical design in cooperation with bolts to achieve the anti-loosening reliability of mechanical connections. Anti-loosening reliability is the most critical parameter. Traditional self-locking nuts use rigid closing to deform the internal thread and achieve anti-loosening and locking through interference. The self-locking nuts are basically disposable. When used for the second time, their locking performance is greatly attenuated and cannot meet the locking performance requirements. After assembly, the threads of the bolts are severely damaged due to interference during assembly and cannot be used for the second time. Therefore, both the bolts and the nuts are used in pairs and are disposable, resulting in a high cost and a sharp increase in the product maintenance cost. In many product designs, the requirements for the outer dimension, tensile property, and load-bearing property of the self-locking nuts are exactly the same, only the locking performance requirements are different. Therefore, it is necessary to manufacture many self-locking nuts with different locking performances. If different locking requirements can be achieved on the same self-locking nut, it is an urgent need for design and manufacturing.

[0004] Therefore, in order to be able to achieve a controllable locking torque, different required locking torques can be obtained on the same product, and it can be repeatedly disassembled under the condition of not damaging the installation bolt and smooth assembly, with no attenuation of its locking torque, and the locking performance of flexible closing is more stable and reliable than that of rigid closing. Such mechanical connections are very necessary. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the problems existing in the background technology, and thus provide a multi-stage flexible potential energy self-locking nut connector. By using this connector and adopting a flexible closing method, a controllable locking torque can be achieved, and different required locking torques can be obtained on the same product. Under the condition of not damaging the installation bolt and ensuring smooth assembly, it can be disassembled repeatedly, and its locking torque does not decay, and the locking performance is reliable, so as to meet the usage requirements of anti-loosening. Specifically, it is a multi-stage flexible potential energy self-locking nut connector, as well as its manufacturing method and usage method.

[0006] To solve the above technical problem, the technical solution adopted by the present invention is: a multi-stage flexible potential energy self-locking nut connector, the connector includes a locking spring and a nut body. The nut body includes a screwing part and a wrenching part. In the screwing part, there is a receiving cavity matching the locking spring. On the side surface of the screwing part, there is a locking hole communicating with the receiving cavity, and on the inner wall surface of the receiving cavity, there are multi-stage locking grooves; in the wrenching part, there is an internal thread hole communicating with the receiving cavity, and the receiving cavity and the thread hole are coaxially arranged in the nut body. The locking spring is placed in the receiving cavity, its lower end is clamped in the multi-stage locking grooves, and its upper end is located in the locking hole.

[0007] Furthermore, for the multi-stage flexible potential energy self-locking nut connector of the present invention, the connector is also equipped with an installation bolt. The installation bolt is screwed with the wrenching part in the nut body through the internal thread hole and extends upward to the outside of the nut body. The installation bolt is in contact connection with the locking spring placed in the receiving cavity.

[0008] Furthermore, for the multi-stage flexible potential energy self-locking nut connector of the present invention, the internal thread hole in the wrenching part uses metric thread or imperial thread, and the thread in the installation bolt matches the internal thread hole.

[0009] Furthermore, for the multi-stage flexible potential energy self-locking nut connector of the present invention, the locking spring is a torsion spring, its diameter is not greater than four times the pitch of the installation bolt, the pitch of the locking spring is the same as the pitch of the installation bolt, and the two are jointly screwed with the installation bolt and the internal thread hole, and the elastic potential energy of the locking spring is used to achieve locking.

[0010] Furthermore, for the multi-stage flexible potential energy self-locking nut connector of the present invention, the multi-stage locking grooves are composed of a plurality of limiting grooves evenly arranged along the inner wall surface of the receiving cavity. The limiting grooves match the outer diameter of the locking spring, and the locking spring is clamped in the limiting grooves to ensure the stability of the locking torque.

[0011] Furthermore, for the multi-stage flexible potential energy self-locking nut connector of the present invention, the position accuracy of the locking hole and the multi-stage locking grooves are both controlled within ±0.5 mm.

[0012] The present invention also discloses a manufacturing method of the above multi-stage flexible potential energy self-locking nut connector. The manufacturing method mainly includes the following steps: S1. Manufacturing the nut body: A bar material is molded or forged into a nut blank at high temperature, and the blank is rapidly cooled and then formed by mechanical finishing. Finally, a locking hole and multi-stage locking grooves are made to obtain the finished nut body. S2. Manufacturing the locking spring: A steel wire is wound into a spiral structure in the shape of a thread on a special spring machine. Among them, the top of the locking spring is a straight line segment that fits the locking hole, and the bottom is a straight line segment that fits the multi-stage locking grooves. After being wound into a torsion spring structure, the finished locking spring is obtained.

[0013] Furthermore, adopting the manufacturing method of the present invention, the blank for manufacturing the nut body is a cold-drawn hexagonal bar or an alloy steel material or a martensitic stainless steel material strengthened by heat treatment. After being processed by pressure, it does not break and forms a streamline arrangement, making the grain streamline uniform and complete. After being formed by mechanical processing and finally undergoing cold work hardening by pressure processing, the blank can be obtained. Among them, the screwing part is a cylindrical structure, and the wrenching part is a wrenching hexagonal surface structure.

[0014] Furthermore, adopting the manufacturing method of the present invention, the steel wire used for manufacturing the locking spring is carbon spring steel wire or alloy spring steel wire. The carbon spring steel wire or alloy spring steel wire meets certain elastic requirements through heat treatment. It is required that there is no fracture and failure under 1000 times of repeated bending of fatigue strength. At the same time, when winding the steel wire into shape, it is required that the pitch between adjacent turns is equal to the pitch of the installation bolt, and the diameter of the steel wire is not greater than four times the pitch of the installation bolt. When winding into shape, the inner diameter size of the locking spring is determined according to the tightening performance requirements and in combination with the heat treatment index of the locking spring.

[0015] The present invention also discloses a using method of the above multi-stage flexible potential energy self-locking nut connector. The using method mainly includes the following steps: S1. According to the thickness and connection hole size of the to-be-connected and fixed to-be-connected part Ⅰ and to-be-connected part Ⅱ, select the nut body and the locking spring in advance, and configure the corresponding installation bolt according to the determined nut body. S2. First, place the locking spring inside the accommodation cavity in the screwing part. The straight line segment at the bottom is clamped in one of the locking grooves in the multi-stage locking grooves, and the straight line segment at the top is inserted into the locking hole to complete the assembly of the nut body and the locking spring. S3. Overlap the connector - to - be Ⅰ and the connector - to - be Ⅱ from top to bottom. Then, insert the mounting bolt through the connector - to - be Ⅱ and the connector Ⅰ from bottom to top. After that, screw the assembled nut body onto the mounting bolt through the internal - thread hole, and make the bottom surface of the nut body abut against the connector Ⅰ. The upper end of the mounting bolt extends outside the upper surface of the nut body. Through the cooperation of the locking spring placed in the accommodating cavity and the mounting bolt, self - locking of the mounting bolt is achieved to ensure the stability of the locking torque.

[0016] When using a multi - stage flexible potential - energy self - locking nut connector, its manufacturing method and usage method according to the present invention, compared with the prior art, the beneficial effects are as follows: Since an accommodating cavity is provided in the screwing part, and a locking hole communicating with the accommodating cavity is provided on the side surface of the screwing part. At the same time, multi - stage locking grooves are provided on the inner wall surface of the accommodating cavity. The locking spring is installed in the accommodating cavity, the straight - line segment at its bottom is clamped in the multi - stage locking grooves, and the straight - line segment at its top is inserted into the locking hole. Through the cooperation of the locking spring placed in the accommodating cavity and the mounting bolt, locking is achieved by using the elastic potential energy of the locking spring. In this way, different requirements for locking torques can be obtained on the same product, realizing multi - stage control. This is one of the keys of the present invention. Secondly, the locking requirement is realized in the form of a combination. Through the cooperation of the locking spring and the nut body, rigid closing is avoided. This is the second key of the present invention. Thirdly, a flexible elastic - potential - energy locking method is adopted. When repeatedly disassembling and assembling, the locking torque does not decay. Compared with the traditional locking scheme formed by subsequent press - working closing, its locking performance is flexible, avoiding traditional rigid closing, without damaging the mounting bolt, and the locking performance does not decay during repeated disassembly. The flexible closing has more stable locking performance than the rigid closing. Locking is achieved by using the elastic potential energy of the locking spring, effectively avoiding the interference friction between the closing point and the mating bolt during rigid locking, and the problem that the closing point has large wear due to friction and the locking torque decays severely. The locking spring tightly holds the mating bolt. When the change amount of the thread size of the mating bolt is within the proportional limit of the deformation amount of the locking spring, the change of the locking torque is extremely small and tends to be constant. Adopting flexible closing and the locking torque does not decay during repeated disassembly. This is the third key of the present invention. Fourthly, the flexible elastic - potential - energy locking has more stable locking performance than the rigid closing. By using the elastic potential energy of the locking spring, locking can be achieved. The locking torque tends to be constant by using the elastic potential energy of the locking spring. This is the fourth key of the present invention. Fifthly, adopting the flexible elastic - potential - energy locking method, the internal - thread hole in the nut body is not deformed, so there is no damage to the mounting bolt, the thread profile of the nut is complete, and the assembly with the mounting bolt is smooth. This is the fifth key of the present invention. Finally, locking is achieved by using the elastic potential energy of the locking spring, the internal - thread hole in the nut body is not deformed, and on the premise of no damage to the mounting bolt, the thread profile of the nut is complete and can be repeatedly disassembled, which is convenient for maintenance. In this way, the maintenance cost can be reduced. This is the sixth key of the present invention.

[0017] In summary, by adopting the self-locking nut connector, manufacturing method and usage method of the present invention, a new connection solution can be provided for the self-locking nut connector, and the requirements of locking torques with different needs can be obtained on the same product. It can not only achieve multi-level control, but also realize controllable locking torque, without damaging the installation bolt, ensuring smooth assembly, being able to be disassembled repeatedly, and ensuring that the locking torque does not decay, with high locking safety and reliability, stable mechanical properties, and convenient maintenance. Thus, it meets the usage requirements of anti-loosening and is particularly suitable for popularization and application in the field of mechanical connection with high locking performance requirements and frequent disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described in detail below with reference to the accompanying drawings.

[0019] Figure 1 is a schematic structural diagram of the self-locking nut connector of the present invention; Figure 2 is Figure 1 a top view of Figure 3 is a schematic structural diagram of the nut body in the present invention; Figure 4 is Figure 3 a top view of Figure 5 is a schematic structural diagram of the locking spring in the present invention; Figure 6 is Figure 5 a top view of Figure 7 is an application example diagram of the self-locking nut connector of the present invention.

[0020] As shown in the figure: 1 - locking spring, 2 - nut body, 3 - internal thread hole, 4 - locking hole, 5 - inner cylindrical surface, 6 - upper surface, 7 - multi-stage locking groove, 8 - screwing part, 9 - wrenching part, 10 - bottom surface, 11 - installation bolt, 12 - to-be-connected part Ⅰ, 13 - to-be-connected part Ⅱ. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following specific embodiments illustrate the implementation manners of the present invention, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0022] It should be noted that the structures, proportions, sizes, etc. depicted in the accompanying drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the conditions for the implementation of the present invention. Therefore, they do not have substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", etc. cited in this specification are only for the convenience of description and are not used to limit the scope for the implementation of the present invention. The change or adjustment of their relative relationship, without substantial change in the technical content, should also be regarded as the scope within which the present invention can be implemented.

[0023] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "provided with" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] It should be noted that the term "comprising" or any other variant is intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such a process, method, article, or device. Embodiment 1

[0025] As Figures 1 to 6 shown, a multi-stage flexible potential energy self-locking nut connector provided by the present invention is adopted. The connector includes a locking spring 1 and a nut body 2. At the same time, an installation bolt 11 is also configured. The nut body 2 includes a screwing portion 8 and a wrenching portion 9. A receiving cavity matching the locking spring 1 is provided in the screwing portion 8. A locking hole 4 communicating with the receiving cavity is provided on the side surface of the screwing portion 8, and a multi-stage locking groove 7 is provided on the inner wall surface of the receiving cavity; an internal thread hole 3 communicating with the receiving cavity is provided in the wrenching portion 9, and the receiving cavity and the thread hole 3 are coaxially arranged in the nut body 2. The locking spring 1 is placed in the receiving cavity, its lower end is clamped in the multi-stage locking groove 7, and its upper end is located in the locking hole 4; the installation bolt 11 is screwed with the wrenching portion 9 in the nut body 2 through the internal thread hole 3 and extends upward to the outside of the nut body 2. The installation bolt 11 is in contact connection with the locking spring 1 placed in the receiving cavity.

[0026] Further, a multi - stage flexible potential energy self - locking nut connector provided by this embodiment is adopted. The internal thread hole 3 in the wrenching part 9 uses metric thread or imperial thread, and the thread in the mounting bolt 11 matches the internal thread hole 3. In addition, the locking spring 1 is a torsion spring, whose diameter is not greater than four times the pitch of the mounting bolt 11. The pitch of the locking spring 1 is the same as the pitch of the mounting bolt 11, and the two are jointly screwed with the mounting bolt 11 and the internal thread hole 3 to achieve locking by using the elastic potential energy of the locking spring 1.

[0027] Further, a multi - stage flexible potential energy self - locking nut connector provided by this embodiment is adopted. The multi - stage locking groove 7 is composed of a plurality of limiting grooves uniformly arranged along the inner wall surface of the accommodating cavity. The limiting grooves match the outer diameter of the locking spring 1, and the locking spring 1 is clamped in the limiting grooves to ensure the stability of the locking torque. At the same time, the position accuracy of both the locking hole 4 and the multi - stage locking groove 7 is controlled within ±0.5 mm to ensure the stability of the locking torque. The nominal dimension of the relative position is determined according to the locking performance requirements in combination with the heat treatment index of the locking spring 1. Embodiment 2

[0028] The present invention also provides a manufacturing method for the multi - stage flexible potential energy self - locking nut connector described in Embodiment 1. The manufacturing method mainly includes the following steps: S1. Manufacturing the nut body: A bar is used to be molded or forged into a nut blank at high temperature, and the blank is rapidly cooled and then formed by mechanical precision machining. Finally, the locking hole 4 and the multi - stage locking groove 7 are made to obtain the finished nut body 2. The obtained finished nut body 2 includes a screwing part 8 and a wrenching part 9. The top of the screwing part 8 is the upper surface 6, and the bottom of the wrenching part 9 is the bottom surface 10. The outer side surface of the screwing part 8 is the outer cylindrical surface 6, and the accommodating cavity in the screwing part 8 has an inner cylindrical surface 5. The multi - stage locking groove 7 is arranged on the inner cylindrical surface 5. The internal thread hole 3 in the wrenching part 9 and the accommodating cavity in the screwing part 8 are coaxially arranged in the nut body 2. It is required that the position accuracy of both the locking hole 4 and the multi - stage locking groove 7 is controlled within ±0.5 mm to ensure the stability of the locking torque. The nominal dimension of the relative position is determined according to the locking performance requirements in combination with the heat treatment index of the locking spring 1. S2. Manufacturing the locking spring: A wire is used to be wound into a spiral structure in the shape of a thread on a special spring machine. Among them, the top of the locking spring 1 is a straight line segment that matches the locking hole 4, and its bottom is a straight line segment that matches the multi - stage locking groove 7. After being wound into a torsion spring structure, the finished locking spring 1 is obtained.

[0029] Furthermore, by adopting the manufacturing method of the present invention, the blank for manufacturing the nut body 2 is made of cold-drawn hexagonal bar or alloy steel material or martensitic stainless steel material strengthened by heat treatment. After pressure processing, it does not break and forms a streamline arrangement, making the grain streamline uniform and complete. After being formed by machining and finally undergoing cold work hardening through pressure processing, the blank can be obtained. Among them, the screwing part 8 is a cylindrical structure, and the wrenching part 9 is a wrenching hexagonal surface structure.

[0030] In the specific manufacturing method, by adopting the manufacturing method of this embodiment, the steel wire used for manufacturing the locking spring 1 is carbon spring steel wire or alloy spring steel wire. The carbon spring steel wire or alloy spring steel wire meets certain elastic requirements through heat treatment. Considering factors such as product disassembly, it is required that there is no fracture and failure under 1000 times of repeated bending of fatigue strength. At the same time, when forming by winding the steel wire, it is required that the pitch between adjacent turns is equal to the pitch of the mounting bolt 11, and the diameter of the steel wire is not greater than four times the pitch of the mounting bolt 11. When winding and forming, the inner diameter size of the locking spring 1 is determined according to the pressing performance requirements and combined with the heat treatment index of the locking spring 1. Embodiment 3

[0031] The present invention provides a usage method of the multi-stage flexible potential energy self-locking nut connector described in Embodiment 1. During the actual assembly and use process, the usage method mainly includes the following steps: S1. According to the thickness and connection hole size of the to-be-connected member I 12 and the to-be-connected member II 13 to be connected and fixed, select the nut body 2 and the locking spring 1 in advance, and configure the corresponding mounting bolt 11 according to the determined nut body 2; S2. First, place the locking spring 1 inside the accommodating cavity in the screwing part 8. The straight section at its bottom is clamped in one of the locking grooves in the multi-stage locking groove 7, and the straight section at its top is inserted into the locking hole 4 to complete the assembly of the nut body 2 and the locking spring 1; S3. Stack the to-be-connected member I 12 and the to-be-connected member II 13 from top to bottom, then pass the mounting bolt 11 through the to-be-connected member II 13 and the connecting member I 12 from bottom to top in sequence. Then, screw the assembled nut body 2 with the mounting bolt 11 through the internal thread hole 3, and make the bottom surface of the nut body 2 abut against the to-be-connected member I 12. The upper end of the mounting bolt 11 extends to the outside of the upper surface of the nut body 2. Through the cooperation of the locking spring 1 placed inside the accommodating cavity and the mounting bolt 11, self-locking of the mounting bolt 11 is realized to ensure stable locking torque.

[0032] In summary, by adopting the self-locking nut connector, manufacturing method and usage method of the present invention, through the cooperation of the locking spring 1 and the nut body 2, and utilizing the elastic potential energy of the locking spring 1, multi-stage flexible locking can be achieved, which can provide a new connection solution for the self-locking nut connector, and can meet the requirements of obtaining locking torques with different needs on the same product. It can not only achieve multi-stage control, but also achieve a controllable locking torque, without damaging the installation bolt, ensuring smooth assembly, being able to be disassembled repeatedly, and ensuring that the locking torque does not decay, with high locking safety and reliability, stable mechanical properties, and convenient maintenance. Thus, it can meet the usage requirements of preventing loosening, and is particularly suitable for popularization and application in the field of mechanical connection with high locking performance requirements and frequent disassembly.

[0033] Other details not elaborated in the present invention are all well-known conventional technologies in the art.

[0034] The protection scope of the present invention is not limited to the technical solutions disclosed in the specific embodiments. The above are only the preferred embodiments of the present invention and do not limit the present invention. Any minor modifications, equivalent substitutions and improvements made based on the technical solutions of the present invention should be included within the protection scope of the technical solutions of the present invention.

Claims

1. A multi-stage flexible potential energy self-locking nut connecting piece, characterized in that: The connecting piece includes a locking spring (1) and a nut body (2). The nut body (2) includes a screwing part (8) and a wrenching part (9). An accommodating cavity matching the locking spring (1) is provided in the screwing part (8). A locking hole (4) communicating with the accommodating cavity is provided on the side surface of the screwing part (8), and a multi-stage locking groove (7) is provided on the inner wall surface of the accommodating cavity. An internal threaded hole (3) communicating with the accommodating cavity is provided in the wrenching part (9), and the accommodating cavity and the threaded hole (3) are coaxially arranged in the nut body (2). The locking spring (1) is placed in the accommodating cavity, its lower end is clamped in the multi-stage locking groove (7), and its upper end is located in the locking hole (4).

2. The multi-stage flexible potential energy self-locking nut connector according to claim 1, characterized in that: The connecting piece is further configured with a mounting bolt (11). The mounting bolt (11) is screwed with the wrenching part (9) in the nut body (2) through the internal threaded hole (3) and extends upward to the outside of the nut body (2). The mounting bolt (11) is in contact connection with the locking spring (1) placed in the accommodating cavity.

3. The multi-stage flexible potential energy self-locking nut connecting piece according to claim 2, characterized in that: The internal threaded hole (3) in the wrenching part (9) adopts a metric thread or an imperial thread, and the thread in the mounting bolt (11) matches the internal threaded hole (3).

4. A multi-stage flexible potential energy self-locking nut connector according to claim 3, characterized in that: The locking spring (1) is a torsion spring, and its diameter is not greater than four times the pitch of the mounting bolt (11). The pitch of the locking spring (1) is the same as the pitch of the mounting bolt (11), and the two are jointly screwed with the mounting bolt (11) and the internal threaded hole (3) to achieve locking by using the elastic potential energy of the locking spring (1).

5. The multi-stage flexible potential energy self-locking nut connecting piece according to claim 4, wherein: The multi-stage locking groove (7) is composed of a plurality of limiting grooves uniformly arranged along the inner wall surface of the accommodating cavity. The limiting grooves match the outer diameter of the locking spring (1), and the locking spring (1) is clamped in the limiting grooves to ensure the stability of the locking torque.

6. The multi-stage flexible potential energy self-locking nut connector according to claim 5, characterized in that: The position accuracy of the locking hole (4) and the multi-stage locking groove (7) is controlled within ±0.5 mm.

7. A method for manufacturing a multi-stage flexible potential energy self-locking nut connector according to any one of claims 1 to 6, characterized in that: The manufacturing method mainly includes the following steps: S1. Manufacturing the nut body: A bar is used to be molded or forged into a nut blank at high temperature, and the blank is rapidly cooled and then formed by mechanical finishing. Finally, the locking hole (4) and the multi-stage locking groove (7) are made to obtain the finished nut body (2). S2. Manufacturing the locking spring: A wire is used to be wound into a spiral structure in the shape of a thread on a special spring machine. Among them, the top of the locking spring (1) is a straight line segment matching the locking hole (4), and its bottom is a straight line segment matching the multi-stage locking groove (7), and it is wound into a torsion spring structure to obtain the finished locking spring (1).

8. The manufacturing method according to claim 7, characterized in that: The blank for manufacturing the nut body (2) adopts a cold-drawn hexagonal bar or an alloy steel material or a martensitic stainless steel material strengthened by heat treatment. After pressure processing, it does not break and forms a streamline arrangement, making the grain streamline uniform and complete. After being formed by mechanical processing and finally undergoing cold work hardening through pressure processing, the blank can be obtained. Among them, the screwing part (8) is a cylindrical structure, and the wrenching part (9) is a wrenching hexagonal surface structure.

9. The manufacturing method according to claim 7, characterized in that: The steel wire used for manufacturing the locking spring (1) is carbon spring steel wire or alloy spring steel wire. The carbon spring steel wire or alloy spring steel wire meets certain elastic requirements through heat treatment, and it is required that there is no fracture or failure under 1000 times of repeated bending in terms of fatigue strength. At the same time, when using wire winding to form, it is required that the pitch between adjacent turns is equal to the pitch of the mounting bolt (11), and the wire diameter is not greater than four times the pitch of the mounting bolt (11). When winding and forming, the inner diameter size of the locking spring (1) is determined according to the fastening performance requirements and in combination with the heat treatment index of the locking spring (1).

10. A method of using the multi-stage flexible potential energy self-locking nut connecting member according to any one of claims 1 to 6, characterized in that: The usage method mainly includes the following steps: S1. According to the thicknesses and connection hole sizes of the to-be-connected and fixed to-be-connected parts I and II, select the nut body (2) and the locking spring (1) in advance, and configure the corresponding mounting bolt (11) according to the determined nut body (2); S2. First, place the locking spring (1) inside the accommodation cavity in the screwing part (8), with the straight section at its bottom clamped in one of the locking grooves in the multi-stage locking groove (7), and the straight section at its top inserted into the locking hole (4) to complete the assembly of the nut body (2) and the locking spring (1); S3. Stack the to-be-connected part I and the to-be-connected part II from top to bottom, then pass the mounting bolt (11) through the to-be-connected part II and the to-be-connected part I from bottom to top in sequence. After that, screw the assembled nut body (2) with the mounting bolt (11) through the internal thread hole (3), and make the bottom surface of the nut body (2) abut against the to-be-connected part I, while the upper end of the mounting bolt (11) extends to the outside of the upper surface of the nut body (2). Through the cooperation of the locking spring (1) placed inside the accommodation cavity and the mounting bolt (11), self-locking of the mounting bolt (11) is achieved to ensure the stability of the locking torque.

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