Anti-loosening bolt assembly, use method, and repeatable removal and use method

Abstract

An anti-loosening bolt assembly, a use method, and a repeatable removal and use method. The anti-loosening bolt assembly comprises: a screw rod (100), the screw rod (100) comprising a head portion (110), and a rod portion (120) sequentially passing through a first workpiece (300) and a second workpiece (400), the outer wall of the rod portion (120) being provided with an outer thread (121), and the side of the outer thread (121) facing towards the head portion (110) being provided with a plurality of locking slots (1201) arranged at equal intervals along the extension direction of the outer thread (121); and a locking nut (200) connected to the rod portion, the locking nut (200) being provided with an inner thread (210), the side of the inner thread (210) facing away from the head portion (110) being provided with locking protrusions (211), the inner thread (210) fitting the outer thread (121) to drive the locking nut (200) to move towards the second workpiece (400) and press the second workpiece (400), and to drive the locking protrusions (211) to sequentially pass through the plurality of locking slots (1201) in the screw-in direction of the locking nut (200) and be in embedded fit with the locking slots (1201), so as to prevent the locking nut (200) from screwing out.

Description

Anti-loosening bolt assembly, method of use, and method of repeatable removal of use TECHNICAL FIELD

[0001] The present application relates to the technical field of fastening anti-loosening connection, in particular to an anti-loosening bolt assembly, a method of use applied to the anti-loosening bolt assembly, and a method of repeatable removal of use applied to the anti-loosening bolt assembly. BACKGROUND

[0002] In the use sites of high-speed rail, automobiles, aircraft, ships and high-power industrial equipment, it is crucial to ensure that the installed workpiece will not loosen under long-term strong vibration environment. There are currently two main types of anti-loosening technologies on the market: one is mainly based on over-tight clearance fit, such as oval bolt nuts and Shibilao nuts, etc. These technologies achieve the purpose of anti-loosening by increasing the friction between the bolt and the nut; the other is the use of positive and reverse locking assembly technology, which designs a special thread structure, such as positive and reverse locking thread, so that when subjected to vibration, the thread generates an opposite force to the tightening direction, thereby preventing the bolt from loosening.

[0003] However, these existing technologies have certain limitations.

[0004] For the over-tight clearance fit technology, although it can achieve the purpose of anti-loosening by increasing the friction, this way will cause a large stress concentration on the bolt, resulting in irreversible deformation of the bolt when subjected to vibration, which greatly shortens the service life of the bolt. In general, once disassembled, a new piece needs to be replaced, which not only increases the difficulty of maintenance, but also limits the reusability of the fastener.

[0005] As for the positive and reverse locking assembly technology, although it tries to improve the anti-loosening effect through a special thread structure, in actual application, this structure is still limited in anti-loosening effect, especially in a strong vibration environment, it may still loosen, which poses a hidden danger to the safe operation of the system, and this design also has the problem of inconvenient disassembly.

[0006] In summary, although the existing technologies can solve the anti-loosening problem of fasteners in a vibration environment to some extent, they still have problems such as insufficient durability, inconvenient disassembly, and poor reliability, therefore, there is an urgent need for a new type of anti-loosening bolt assembly to solve the above technical problems. SUMMARY

[0007] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application proposes an anti-loosening bolt assembly, which can be firmly installed and used under long-term strong vibration environment and is not easy to fall off, not only enhancing the anti-loosening performance, but also ensuring the reusability of the assembly, significantly improving the durability and reliability.

[0008] The application further provides a method for using the anti-loose bolt assembly and a method for repeatedly disassembling and using the anti-loose bolt assembly.

[0009] The anti-loose bolt assembly comprises:

[0010] The screw rod comprises a head and a rod part, the rod part is used for sequentially penetrating the first workpiece and the second workpiece, an outer wall of the rod part is provided with external threads, the external threads are provided with a plurality of retreat-stop grooves on a side facing the head, and the plurality of retreat-stop grooves are equidistantly arranged along an extension direction of the external threads.

[0011] The retreat-stop nut is connected to the rod part, the retreat-stop nut is provided with internal threads, and the internal threads are provided with retreat-stop protrusions on a side facing away from the head.

[0012] The internal threads are adapted to threadedly cooperate with the external threads, drive the retreat-stop nut to move towards a side of the second workpiece and press the second workpiece, and drive the retreat-stop protrusions to sequentially pass through the plurality of retreat-stop grooves and be embeddedly matched with the retreat-stop grooves along a screwing-in direction of the retreat-stop nut, so as to block the retreat of the retreat-stop nut.

[0013] The anti-loose bolt assembly has at least the following beneficial effects: the retreat-stop grooves are arranged on the outer wall of the screw rod, and the retreat-stop protrusions corresponding to the retreat-stop grooves are arranged on the retreat-stop nut, so that the retreat-stop protrusions are embeddedly matched with the retreat-stop grooves during the screwing-in process of the nut, thereby effectively preventing the nut from being loosened and screwed out due to vibration, and further ensuring the fastening state between the nut and the workpiece.

[0014] The plurality of retreat-stop protrusions are equidistantly arranged along an extension direction of the internal threads, and intervals of adjacent retreat-stop protrusions are equal to intervals of adjacent retreat-stop grooves.

[0015] The retreat-stop protrusions are arranged at an outermost circle of the internal threads.

[0016] The retreat-stop grooves are wedge-shaped, and shapes of the retreat-stop protrusions correspond to a shape of the retreat-stop grooves.

[0017] The retreat-stop grooves are provided with a blocking surface on a side facing a screwing-out direction of the retreat-stop nut, an included angle between the blocking surface and an axial section of the rod part is A, and 85°≤A≤90° is satisfied.

[0018] According to the anti-loosening bolt assembly of some embodiments of the present application, an elastic washer is arranged between the retreat-stop nut and the head, and one side of the elastic washer is pressed against the second workpiece, and the other side of the elastic washer is pressed against the retreat-stop nut, so as to drive the retreat-stop protrusion to be embedded in the retreat-stop groove.

[0019] According to the anti-loosening bolt assembly of some embodiments of the present application, a fastening nut is arranged between the elastic washer and the second workpiece, and the fastening nut is adapted to be screwed with the rod and to press the second workpiece, and the fastening nut is arranged integrally or separately with the elastic washer, so as to adjust the compression amount of the elastic washer.

[0020] According to the anti-loosening bolt assembly of some embodiments of the present application, an auxiliary nut is arranged on the side of the retreat-stop nut away from the fastening nut, and the auxiliary nut is screwed with the rod and pushes the retreat-stop nut to move towards the side of the elastic washer, so as to drive the retreat-stop protrusion to be separated from the retreat-stop groove, and the fastening nut, the retreat-stop nut and the auxiliary nut are removed together.

[0021] According to the use method of the present application, the method is applied to the anti-loosening bolt assembly of the present application, and the method comprises the following steps: workpiece alignment: the first workpiece is provided with a first mounting hole, the second workpiece is provided with a second mounting hole, the first workpiece and the second workpiece are placed in alignment, and the first mounting hole and the second mounting hole are driven to be communicated; screw rod insertion: the rod is sequentially inserted into the first mounting hole and the second mounting hole, and the head is abutted against the wall surface on the side of the first workpiece away from the second workpiece; retreat-stop nut screwing: the retreat-stop nut is screwed from the side of the rod away from the head, and is pressed against the wall surface of the second workpiece, so as to drive the second workpiece to be fixedly pressed against the first workpiece.

[0022] According to the use method of the present application, at least the following beneficial effects are achieved: through the alignment of the first workpiece and the second workpiece, the screw rod is sequentially inserted into the two workpieces, and the retreat-stop nut is screwed, so as to ensure that the fastener can be correctly installed and provide stable fastening effect.

[0023] The repeated dismounting and using method according to the application is applied to the anti-loose bolt assembly according to the application, and comprises the following steps: workpiece alignment: a first workpiece is provided with a first mounting hole, a second workpiece is provided with a second mounting hole, the first workpiece and the second workpiece are placed in alignment, and the first mounting hole and the second mounting hole are caused to communicate; screw rod insertion: the rod portion is sequentially inserted into the first mounting hole and the second mounting hole, and the head portion abuts against the wall surface on the side of the first workpiece away from the second workpiece; pre-disassembly component installation: the fastening nut and the elastic washer are sleeved on the side of the rod portion away from the head portion, the fastening nut is tightened and pressed against the wall surface of the second workpiece, so as to cause the second workpiece to be pressed and fixed with the first workpiece; when dismounting is required, the following steps are further included: auxiliary nut insertion: the auxiliary nut is inserted from the side of the rod portion away from the head portion, the stop nut is pushed to move to the side of the elastic washer, so as to cause the stop protrusion to be separated from the stop groove, and then, the fastening nut, the stop nut and the auxiliary nut are rotated out as a whole.

[0024] The repeated dismounting and using method according to the application has at least the following beneficial effects: in addition to the installation step, the common dismounting of the fastening nut, the stop nut and the auxiliary nut is realized by inserting the auxiliary nut, which not only simplifies the dismounting process, but also ensures the safe and reliable repeated use of the stop nut, and improves the maintainability and economy.

[0025] Additional aspects and advantages of the application will be made apparent by the following description and the appended claims. BRIEF DESCRIPTION OF DRAWINGS

[0026] The above and / or additional aspects and advantages of the application will become apparent and be readily understood by considering the following detailed description, from which the singular aspects become apparent.

[0027] Fig. 1 is a structural schematic view of an anti-loose bolt assembly according to some embodiments of the application;

[0028] Fig. 2 is a schematic view of installing a fastening nut when the anti-loose bolt assembly according to the embodiments of the application is applied;

[0029] Fig. 3 is a schematic view of installing an elastic washer and a stop nut when the anti-loose bolt assembly according to the embodiments of the application is applied;

[0030] Fig. 4 is a schematic view of tightening the stop nut when the anti-loose bolt assembly according to the embodiments of the application is applied;

[0031] Fig. 5 is a schematic view of inserting an auxiliary nut when the anti-loose bolt assembly according to the embodiments of the application is applied;

[0032] Fig. 6 is a flow chart corresponding to the use method shown in Fig. 1;

[0033] Fig. 7 is a flow chart corresponding to the reusable use method shown in Figs. 2 to 5.

[0034] BRIEF DESCRIPTION OF DRAWINGS Screw 100; head 110; shank 120; retreat stop groove 1201; blocking surface 12011; external thread 121; retreat stop nut 200; internal thread 210; retreat stop protrusion 211; first workpiece 300; first mounting hole 301; second workpiece 400; second mounting hole 401; elastic washer 500; fastening nut 600; auxiliary nut 700. DETAILED DESCRIPTION

[0035] Embodiments of the present application are described in detail below with reference to the accompanying drawings, in which like reference numerals indicate like elements or elements having the same or similar function throughout the several views. The embodiments described below are exemplary only, and are not to be construed as limiting the present application.

[0036] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0037] In the description of the present application, several meanings are one or more, and the meaning of multiple is two or more, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If the first, second is described, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of technical features indicated.

[0038] In the description of the present application, unless otherwise explicitly limited, the words such as setting, mounting, connecting, etc. should be broadly understood, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0039] In the description of the application, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In this specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in one or more embodiments or examples.

[0040] In high-speed rail, automobile, aircraft, ship and high-power industrial equipment and other use sites, it is crucial to ensure that the installed workpiece does not loosen in a long-time strong vibration environment. There are currently two types of anti-loosening technologies on the market: one is mainly based on over-tight clearance fit technology, such as oval bolt and nut and Sempol nut, which increases the friction between the bolt and the nut to achieve the purpose of anti-loosening; the other is to use a reverse thread assembly technology, which designs a special thread structure, such as a reverse thread, so that when subjected to vibration, the thread generates a force opposite to the tightening direction, thereby preventing the bolt from loosening.

[0041] However, these existing technologies have certain limitations.

[0042] For the over-tight clearance fit technology, although it can achieve the purpose of anti-loosening by increasing the friction, this way will cause a large stress concentration on the bolt, resulting in irreversible deformation of the bolt when subjected to vibration, which greatly shortens the service life of the bolt. In general, once disassembled, a new piece needs to be replaced, which not only increases the maintenance difficulty, but also limits the reusability of the fastener.

[0043] And for the reverse thread assembly technology, although it tries to improve the anti-loosening effect through special thread structure, in actual application, this structure is still limited in anti-loosening effect, especially in a strong vibration environment, loosening phenomenon may still occur, which brings hidden danger to the safe operation of the system, and this design also has the problem of inconvenient disassembly.

[0044] In summary, although the existing technology can solve the anti-loosening problem of the fastener in the vibration environment to some extent, it still has problems of insufficient durability, inconvenient disassembly and poor reliability, therefore, a new type of anti-loosening bolt assembly is needed to solve the above technical problems.

[0045] To this end, as shown in FIG. 1, the anti-loose bolt assembly provided by the present application comprises a screw rod 100 and a stop nut 200, which are cooperated to fasten a first workpiece 300 and a second workpiece 400. Specifically, the screw rod 100 comprises a head 110 and a rod 120, and the rod 120 is sequentially arranged through the first workpiece 300 and the second workpiece 400. The outer wall of the rod 120 is provided with external threads 121, and the stop nut 200 is connected to the rod 120. The stop nut 200 is provided with internal threads 210 which are adapted to be threadedly cooperated with the external threads 121. Further, the side of the external threads 121 towards the head 110 is provided with stop grooves 1201, and the stop grooves 1201 are multiple and equidistantly arranged along the extension direction of the external threads 121. Correspondingly, the side of the internal threads 210 away from the head 110 is provided with stop protrusions 211. In use, the internal threads 210 are threadedly cooperated with the external threads 121, which drives the stop nut 200 to move towards the side of the second workpiece 400 and press the second workpiece 400, and drives the stop protrusions 211 to sequentially pass through the multiple stop grooves 1201 and be embeddedly cooperated with the stop grooves 1201 along the screwing direction of the stop nut 200, so as to block the stop nut 200 from being unscrewed. It should be noted that, by arranging the stop grooves 1201 on the outer wall of the screw rod 100 and arranging the corresponding stop protrusions 211 on the stop nut 200, the stop protrusions 211 are embeddedly cooperated with the stop grooves 1201 during the screwing process of the nut, so as to effectively prevent the nut from being unscrewed due to vibration and further ensure the fastening state between the nut and the workpiece.

[0046] Referring back to FIG. 1, in some embodiments of the present application, the plurality of retreat prevention protrusions 211 are equidistantly arranged along the extension direction of the internal thread 210, and the interval between adjacent retreat prevention protrusions 211 is equal to the interval between adjacent retreat prevention grooves 1201, which ensures that the retreat prevention protrusions 211 of the retreat prevention nut 200 can be more uniformly embedded in the retreat prevention grooves 1201 on the rod portion 120 during the tightening process, thereby improving the overall stability of the fastener and ensuring that the loosening of the nut can be effectively prevented at any rotational position, thereby improving the reliability and safety of the fastener. Further, the retreat prevention protrusions 211 are arranged on the outermost circle of the internal thread 210. On the one hand, the retreat prevention protrusions 211 on the outermost circle are easy to process and form; on the other hand, the retreat prevention protrusions 211 on the outermost circle can be more effectively embedded in the retreat prevention grooves 1201, thereby improving the anti-loosening ability during use, while also reducing the frictional resistance of the fastener during the tightening process, making the tightening operation more smooth. Optionally, the retreat prevention grooves 1201 are wedge-shaped, and the shape of the retreat prevention protrusions 211 corresponds to the shape of the retreat prevention grooves 1201, so that the retreat prevention protrusions 211 can form a tighter engagement with the retreat prevention grooves 1201 during the tightening process, thereby improving the ability of the fastener to resist vibration. Moreover, the wedge-shaped design helps to gradually increase the tightening force during the tightening process of the retreat prevention nut 200, and in addition, it can also ensure that a good tightening state can be maintained even under strong vibration. Specifically, in some embodiments of the present application, the retreat prevention groove 1201 is provided with a blocking surface 12011 on the side facing the loosening direction of the retreat prevention nut 200, and the included angle between the blocking surface 12011 and the axial section of the rod portion 120 is A, which satisfies: 85°≤A≤90°, which ensures that the retreat prevention nut 200 can be reliably blocked after tightening to prevent it from being accidentally loosened in a vibrating environment, thereby improving the stability of the fastener. For example, A=90°, i.e. the blocking surface 12011 is arranged parallel to the center line of the rod portion 120, which maximally blocks the retreat prevention protrusions 211 from being loosened from the retreat prevention grooves 1201.

[0047] It is easy to understand that the direct use of the above-mentioned retreat prevention nut 200 and screw rod 100 can be well applied to the first workpiece 300 and second workpiece 400 that can be deformed, for example, the retreat prevention nut 200 is constantly tightened to press against the second workpiece 400, causing the second workpiece 400 to deform, so that when the second workpiece 400 returns to its original state after loosening the retreat prevention nut 200, it will push the retreat prevention nut 200, causing the retreat prevention protrusions 211 to be embedded in the retreat prevention grooves 1201. It is easy to understand that when the first workpiece 300 and the second workpiece 400 are steel parts, a small amount of deformation can also occur, thereby directly cooperating with the retreat prevention nut 200 for use. When the first workpiece 300 and the second workpiece 400 are aluminum or plastic parts with lower hardness, the use effect of the retreat prevention nut 200 is better.

[0048] Further, the elastic washer 500 is arranged between the retainer nut 200 and the head 110, one side of the elastic washer 500 is pressed against the second workpiece 400, and the other side is pressed against the retainer nut 200, so as to drive the retainer protrusion 211 to be embedded in the retainer groove 1201. In addition, the elastic washer 500 can also absorb part of the vibration energy, further improving the reliability and durability of the fastener. In some embodiments of the present application, a fastening nut 600 is arranged between the elastic washer 500 and the second workpiece 400, the fastening nut 600 is adapted to be screwed with the rod 120 and press the second workpiece 400, the fastening nut 600 is arranged integrally or separately with the elastic washer 500, so as to adjust the compression amount of the elastic washer 500, and the flexibility of adjusting the compression amount of the elastic washer 500 is provided, so that the user can adjust the fastening force according to different application scenarios, and the application range of the fastener is improved. In some applications, the fastening nut 600 and the elastic washer 500 are arranged separately, the fastening nut 600 is screwed into the screw rod 100 and presses the second workpiece 400 and the first workpiece 300, and the two sides of the elastic washer 500 are pressed against the fastening nut 600 and the retainer nut 200 respectively, so as to provide pre-tightening force for the fastening nut 600 and the retainer nut 200 respectively, and further improve the anti-loose performance. In some applications, the elastic washer is a customized part, and the elastic washer is arranged integrally with the fastening nut, or the side of the elastic washer facing the second workpiece is provided with a hexagonal base (not shown in the figure) for wrench operation. In addition, the auxiliary nut 700 is used to assist in the operation when the retainer nut 200 is removed, the auxiliary nut 700 is arranged on the side of the retainer nut 200 away from the fastening nut 600, the auxiliary nut 700 is screwed with the rod 120 and pushes the retainer nut 200 to move towards the side of the elastic washer 500, so as to drive the retainer protrusion 211 to be separated from the retainer groove 1201, so that the fastening nut 600, the retainer nut 200 and the auxiliary nut 700 are removed together. When the retainer nut 200 needs to be removed, the auxiliary nut 700 can push the retainer nut 200 to overcome the elastic force of the elastic washer 500, so that the retainer protrusion 211 is separated from the retainer groove 1201, and the fastening nut 600, the retainer nut 200 and the auxiliary nut 700 are rotated as a whole. This design simplifies the disassembly process of all nuts, improves the maintenance efficiency, and ensures the safe and reliable reuse of the retainer nut 200. It should be noted that when the retainer nut 200 compresses the elastic washer 500, the elastic washer 500 cannot be compressed to the bottom, and at least 2mm of compression allowance must be reserved, otherwise the retainer nut 200 cannot be removed by further compression with the auxiliary nut 700.

[0049] In some special designs of the inner thread 210 of the retainer nut 200 and the outer thread 121 of the shank 120, the groove width of the outer thread 121 of the shank 120 and the inner thread 210 of the retainer nut 200 is 2-3 times the width of the protrusion of the common thread, so as to facilitate the disengagement of the engagement of the teeth by the pressure of the special tool assembly when disassembling, thereby withdrawing the retainer nut 200. In addition, by selecting elastic washers 500 with different stiffness, it can be ensured that the bolt is not loose and the nut can be disassembled smoothly.

[0050] It is easy to understand that the fastening nut 600 and the auxiliary nut 700 are common threaded nuts, or directly use national standard nuts, and do not need to be provided with the retainer protrusion 211.

[0051] Referring to FIGS. 1 and 6, according to the use method of the embodiment of the application, applied to the anti-loose bolt assembly according to the embodiment of the application, the use method comprises the following steps performed in sequence:

[0052] S100, workpiece alignment: the first workpiece 300 is provided with a first mounting hole 301, the second workpiece 400 is provided with a second mounting hole 401, the first workpiece 300 and the second workpiece 400 are placed in alignment, and the first mounting hole 301 and the second mounting hole 401 are caused to communicate;

[0053] S200, inserting the shank 120 into the first mounting hole 301 and the second mounting hole 401 in sequence, and the head 110 abuts against the wall surface on the side of the first workpiece 300 away from the second workpiece 400;

[0054] S300, screwing in the retainer nut 200: screwing the retainer nut 200 into the shank 120 from the side away from the head 110, and pressing against the wall surface of the second workpiece 400, so as to cause the second workpiece 400 to abut against and be fixed with the first workpiece 300.

[0055] According to the use method of the embodiment of the application, the anti-loose bolt assembly of the embodiment of the application is adopted, the first workpiece 300 and the second workpiece 400 are aligned, the shank 120 is inserted into the two workpieces in sequence, and then the retainer nut 200 is screwed in, so as to ensure that the fastener can be correctly installed and provide stable fastening effect.

[0056] Other configurations and operations of the use method according to the embodiment of the application are known to those skilled in the art, and will not be described in detail here.

[0057] Referring to Figs. 2-7, the repeated dismounting and using method according to the embodiment of the present application is applied to the anti-loose bolt assembly according to the embodiment of the present application, and compared with the above-mentioned using method directly using the screw rod 100 and the retainer nut 200, the repeated dismounting and using method comprises S400 before the retainer nut 200 is screwed in, and installing the pre-disassembly part: the fastening nut 600 and the elastic washer 500 are sleeved from the side of the rod part 120 away from the head part 110, the fastening nut 600 is tightened and pressed against the wall surface of the second workpiece 400, so as to drive the second workpiece 400 to be pressed against and fixed with the first workpiece 300.

[0058] When dismounting is needed, S500 after the retainer nut 200 is screwed in, and the auxiliary nut 700 is screwed in: the auxiliary nut 700 is screwed in from the side of the rod part 120 away from the head part 110, the retainer nut 200 is pushed to move to the side of the elastic washer 500, so as to drive the retainer protrusion 211 to be separated from the retainer groove 1201, then, the fastening nut 600, the retainer nut 200 and the auxiliary nut 700 are rotated out as a whole.

[0059] According to the repeated dismounting and using method of the embodiment of the present application, the fastening nut 600, the retainer nut 200 and the auxiliary nut 700 are dismounted together by screwing in the auxiliary nut 700, which not only simplifies the dismounting process, but also ensures the safe and reliable repeated use of the retainer nut 200, and improves the maintainability and economy.

[0060] Other configurations and operations of the repeated dismounting and using method according to the embodiment of the present application are known to those skilled in the art, and will not be described in detail here.

[0061] The above describes the embodiment of the present application in detail in combination with the drawings, but the present application is not limited to the above-mentioned embodiment, and various changes can be made within the knowledge range of those skilled in the art without departing from the purpose of the present application.

Claims

1. A check bolt assembly, characterized by The screw rod comprises a head and a rod part, the rod part is used to sequentially pass through a first workpiece and a second workpiece, an outer wall of the rod part is provided with an external thread, the external thread is provided with a plurality of retreat-stop grooves on one side of the head, and the plurality of retreat-stop grooves are equidistantly arranged along an extension direction of the external thread. The retreat-stop nut is connected to the rod part, the retreat-stop nut is provided with an internal thread, and the internal thread is provided with a retreat-stop protrusion on a side away from the head. The internal thread is suitable for threadedly cooperating with the external thread, drives the retreat-stop nut to move towards one side of the second workpiece and press the second workpiece, and drives the retreat-stop protrusion to sequentially pass through and be embeddedly matched with the plurality of retreat-stop grooves along a screwing-in direction of the retreat-stop nut to block the retreat of the retreat-stop nut. The plurality of retreat-stop protrusions are equidistantly arranged along an extension direction of the internal thread, and intervals of adjacent retreat-stop protrusions are equal to intervals of adjacent retreat-stop grooves.

2. The check bolt assembly of claim 1, wherein: The retreat-stop protrusions are arranged at an outermost circle of the internal thread.

3. The check bolt assembly of claim 1, wherein: The retreat-stop grooves are wedge-shaped, and shapes of the retreat-stop protrusions correspond to shapes of the retreat-stop grooves.

4. A check bolt assembly according to any one of claims 1 to 3, wherein: The retreat-stop grooves are provided with a blocking surface on one side of a screwing-out direction of the retreat-stop nut, and an included angle between the blocking surface and an axial section of the rod part is A, and 85°≤A≤90° is satisfied.

5. The check bolt assembly of claim 4, wherein: The elastic washer is arranged between the retreat-stop nut and the head, one side of the elastic washer is pressed against the second workpiece, and the other side of the elastic washer is pressed against the retreat-stop nut to drive the retreat-stop protrusion to be embedded in the retreat-stop groove.

6. The check bolt assembly of claim 1, wherein: The fastening nut is arranged between the elastic washer and the second workpiece, the fastening nut is suitable for threadedly cooperating with the rod part and pressing the second workpiece, and the fastening nut is integrally arranged with the elastic washer or separately arranged with the elastic washer to adjust a compression amount of the elastic washer.

7. The check bolt assembly of claim 6, wherein: The auxiliary nut is arranged on a side of the retreat-stop nut away from the fastening nut, the auxiliary nut is threadedly connected with the rod part and pushes the retreat-stop nut to move towards one side of the elastic washer to drive the retreat-stop protrusion to be separated from the retreat-stop groove, so that the fastening nut, the retreat-stop nut and the auxiliary nut are collectively removed.

8. The check bolt assembly of claim 7, wherein:

9. A use method, characterized in that: the use method comprises the following steps: workpiece alignment: the first workpiece is provided with a first mounting hole, the second workpiece is provided with a second mounting hole, the first workpiece and the second workpiece are placed in alignment, and the first mounting hole and the second mounting hole are driven to be communicated; screw rod penetration: the rod part is sequentially penetrated into the first mounting hole and the second mounting hole, and the head is abutted against a wall surface on a side of the first workpiece away from the second workpiece; screw-in of the retreat-stop nut: the retreat-stop nut is screwed in from a side of the rod part away from the head and is pressed against a wall surface of the second workpiece to drive the second workpiece to be fixedly pressed against the first workpiece.

10. A repeatable removal use method, characterized in that: the repeatable removal use method comprises the following steps: ​ ​ ​ Workpiece alignment: the first workpiece is provided with a first mounting hole, and the second workpiece is provided with a second mounting hole, the first workpiece and the second workpiece are placed in alignment, and the first mounting hole and the second mounting hole are driven to communicate; Threaded rod: sequentially thread the rod into the first mounting hole and the second mounting hole, and the head abuts against the wall surface on the side of the first workpiece away from the second workpiece; Install the pre-disassembly part: the fastening nut and the elastic washer are sleeved from the side of the rod away from the head, the fastening nut is tightened and pressed against the wall surface of the second workpiece, so as to drive the second workpiece to be pressed and fixed with the first workpiece; Tighten the stop nut: tighten the stop nut from the side of the rod away from the head, press and drive the elastic washer to compress, so that the elastic force of the elastic washer on the stop nut is greater than the required fastening force between the first workpiece and the second workpiece; When it is necessary to disassemble, the following steps are further included: Tighten the auxiliary nut: tighten the auxiliary nut from the side of the rod away from the head, push the stop nut to move towards the side of the elastic washer, so as to drive the stop protrusion to disengage from the stop groove, and then, the fastening nut, the stop nut and the auxiliary nut are rotated out as a whole.

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