Bolt locking device for engineering

Abstract

The utility model discloses a bolt locking device for engineering, which comprises a bolt and a fastening nut, the bolt comprises a thread section, a screw section and a bolt head which are integrally formed, the fastening nut comprises an outer nut and an inner nut, and the outer nut and the inner nut are respectively screwed on the thread section in the bolt. And an anti-loosening structural part which can be in contact connection with the outer nut is arranged in the threaded section. According to the anti-loosening device, the anti-loosening mode integrating the anti-loosening function, the rainproof function, the dustproof function, the anti-rust function and the lubricating function is adopted, and the two contradictory problems that when an existing bolt is connected with a workpiece, the self-locking capacity is low, loosening often occurs or the bolt is difficult to disassemble although the bolt is not prone to loosening are effectively solved; on the premise that the mechanical property and the structure of an existing bolt product are not damaged, using requirements are met, the national standard is met, and the bolt is characterized by being simple in overall structure, high in reliability, good in safety, high in practical value and beneficial to achieving application and popularization.

Description

TECHNICAL FIELD

[0001] The utility model relates to bolt connection technical field, concretely relates to a bolt anti-loose device for engineering. BACKGROUND

[0002] Bolt is a kind of widely used detachable fixed connection structure, has simple structure, reliable connection and easy to assemble and disassemble etc.Advantages, and is widely used in various industries.The commonly used bolt needs to cooperate with nut, can be used for fastening connection two parts with through hole, such as the nut is unscrewed from the bolt, again can make two parts separate, so bolt connection belongs to detachable connection.Bolt in the long-term use process, because of friction, vibration and temperature and other factors, often nut loosening, nut loosening leads to bolt drop, not only will affect the operation of equipment, even can occur safety accident, there is major safety hazard.Therefore, in order to avoid nut loosening, sometimes have to use the way of gluing or welding dead fixed, but the mode is difficult to disassemble bolt, this makes maintenance and disassembly become very difficult.

[0003] Especially in the field of tower crane, tower crane belongs to the indispensable special equipment on construction site, it is different from other mechanical equipment, since tower crane not only long-term exposure in atmospheric environment, also withstand wind-induced vibration, dancing, line ice shedding and other extreme environmental test.Once the fastening bolt and fastening nut of standard section appear loosening, will lead to fastening bolt and fastening nut fall, will cause tower crane overturning, thereby causing major accident of group death and injury, therefore, for tower crane, bolt connection anti-loose is particularly important.

[0004] In order to avoid the loosening of the bolt applied in the field of tower crane due to vibration during long-term use, the applicant applied for a patent with the name of a thread anti-loosening device on December 25, 2019, the authorized publication number of which is CN211117063U. In daily application process, in order to facilitate use and achieve the purpose of anti-loosening, the applicant applied for a patent with the name of a thread anti-loosening device on August 27, 2020, the authorized publication number of which is CN212838901U. In order to facilitate disassembly and assembly and achieve the purpose of anti-loosening, the applicant applied for a patent with the name of a anti-loosening bolt easy to disassemble on August 20, 2024, the application publication number of which is CN118669406A. The above three patent documents are improvements made by the applicant in daily application process according to the purpose of bolt anti-loosening. In the existing engineering field, especially for the tower crane used in construction site, a large number of bolts are needed, involving different bolt structures. In order to reduce cost, facilitate disassembly and installation, and meet the bolt use requirements in different engineering fields, the existing anti-loosening bolt structure is improved, so as to provide an engineering bolt anti-loosening device, which aims to simultaneously solve the two contradictory problems that the self-locking ability of the existing bolt and workpiece connection is low, and frequent loosening or difficult disassembly occurs. Practical new type content

[0005] The technical problem to be solved by the present utility model is to provide a anti-loosening device with simple structure, convenient disassembly and installation, which can effectively solve the two contradictory problems that the self-locking ability of the existing bolt and workpiece connection is low, and frequent loosening or difficult disassembly occurs, and reduce the production cost, so as to meet the anti-loosening requirements of different engineering bolts, effectively eliminate safety hazards, and specifically a engineering bolt anti-loosening device.

[0006] To solve the above technical problems, the technical scheme adopted by the present utility model is as follows: a engineering bolt anti-loosening device, comprising a bolt and a fastening nut, the bolt comprises a thread segment, a screw rod segment and a bolt head fixed at the end of the screw rod segment, the fastening nut comprises an outer nut and an inner nut, the outer nut and the inner nut are respectively screwed on the thread segment in the bolt, and an anti-loosening structure is arranged in the thread segment and connected with the outer nut.

[0007] Further, the utility model discloses a kind of engineering bolt anti-loosening devices, the anti-loosening structure piece includes lock nut, fastening screw and locking screw, opening key groove matched with the fastening screw is equipped in the side of the thread section, the opening key groove is arranged in the thread section away from bolt head one end, and is located at the non-stress part close to the bolt top, first screw joint through hole matched with fastening screw is equipped in the side of the lock nut, and second screw joint through hole matched with locking screw is equipped in the top surface of the lock nut, the lock nut is detachably screwed on the thread section in bolt, and is clamped to first screw joint through hole and opening key groove by fastening screw, realize the radial location of the lock nut;And the locking screw passes through second screw joint through hole in lock nut downwards, can be contacted with the top surface of outer nut in fastening nut abutting connection, realize the axial location of outer nut in fastening nut.

[0008] Further, the utility model discloses a kind of engineering bolt anti-loosening devices, the lock nut in the anti-loosening structure piece is formed with oil storage chamber between bolt top surface, and is filled with semi-fluid lubricating grease in the oil storage chamber.

[0009] Further, the utility model discloses a kind of engineering bolt anti-loosening devices, the fastening screw in the anti-loosening structure piece is equipped with two, two fastening screws are symmetrically screwed on the outer side of lock nut by first screw joint through hole.

[0010] Further, the utility model discloses a kind of engineering bolt anti-loosening devices, the locking screw in the anti-loosening structure piece is equipped with two, two locking screws are symmetrically screwed on the top surface of lock nut by second screw joint through hole.

[0011] Further, the utility model discloses a kind of engineering bolt anti-loosening devices, the lock nut in the anti-loosening structure piece and the outer nut and inner nut structure in the fastening nut are same, all are hexagon nut structure.

[0012] Further, the utility model discloses a kind of engineering bolt anti-loosening devices, further include with the detachable connection of the anti-loosening structure piece protective cover, the protective cover is set to the bottom opening cylinder structure, the protective cover is detachably covered in lock nut outer side, and respectively with fastening screw and locking screw contact connection.

[0013] Further, the utility model discloses a kind of engineering bolt anti-loosening devices, still be equipped with the limiting structure matched with the fastening screw on the inner wall surface of the protective cover, the fastening screw is contacted with the inner side wall surface of protective cover by limiting structure connection, and the locking screw is contacted with the inner top wall surface of protective cover connection.

[0014] Further, the utility model discloses a kind of engineering bolt anti-loosening devices, the limiting structure includes first limiting groove, second limiting groove and third limiting groove, wherein, the first limiting groove and third limiting groove are arranged on the inner side wall surface of the protective cover along the axial direction of the protective cover, and the second limiting groove is arranged on the inner side wall surface of the protective cover along the circumferential direction of the protective cover, the first limiting groove and third limiting groove are communicated by second limiting groove, and the first limiting groove extends downward to the opening at the bottom of protective cover.

[0015] Compared with prior art, the utility model discloses a kind of engineering bolt anti-loosening devices, and its beneficial effects are as follows: according to relevant national standards, when the locking nut in bolt is locked, at least 3 to 5 thread teeth are generally exposed on bolt, and the opening key groove arranged in threaded segment is located at the non-stress position close to the top of the bolt, so that the strength of the bolt is not affected. By configuring the anti-loosening structure, a detachable assembly method is used. The locking nut is first screwed onto the threaded segment in the bolt and located above the locking nut. Then, the locking screw is screwed into the first screw hole, and the end is connected with the opening key groove arranged in the bolt. This can achieve radial limiting of the locking nut to prevent the locking nut from rotating. At the same time, the locking screw is screwed into the second screw hole in the locking nut, and the end extends downward below the locking nut. When the locking nut loosens, it moves upward along the threaded segment and comes into contact with the locking screw. This can achieve axial limiting of the outer nut in the locking nut. By radial and axial limiting, the anti-loosening effect is further improved, achieving the purpose of anti-loosening. In addition, since the protective cover is also configured, and the limiting structure is provided in the protective cover, the limiting structure includes first limiting groove, second limiting groove and third limiting groove. By setting the limiting structure, the locking screw on the side of the locking nut can be arranged in the third limiting groove. The protective cover not only has the protection effect of dust and rust prevention, but also prevents the locking screw from falling out due to loosening, thereby enhancing the stability and safety. Finally, since the locking nut and the top surface of the bolt form an oil storage chamber, and the oil storage chamber is filled with semi-fluid lubricating grease, the semi-fluid lubricating grease can lubricate the bolt and the locking nut, thereby prolonging the service life of the bolt and the locking nut.

[0016] Therefore, the anti-loosening device has the advantages of detachable assembly, anti-loosening structure and protective cover. The locking screw is used to fix the locking nut, which can achieve radial limiting of the locking nut to prevent the locking nut from rotating in the opposite direction. The locking screw is used to press against the outer nut in the locking nut, which can achieve axial limiting of the outer nut to prevent the outer nut from continuing to rotate in the opposite direction. Radial and axial limiting can further improve the anti-loosening effect and achieve the purpose of anti-loosening.

[0017] In summary, the anti-loose device, adopt the anti-loose, rain, dust and anti-rust lubrication function in one of the anti-loose way, effectively solve the existing bolt and workpiece connection when the self-locking ability is low, often loose or not easy to loosen but difficult to remove the two contradictory problems, through the setting of anti-loose device, without damaging the existing bolt product mechanical properties and structure under the premise of meeting the use requirements, in line with national standards, this is the highlight of the utility model, also its innovation, its overall structure is simple, convenient operation, high reliability, good safety, high practical value, conducive to realize the popularization and application. BRIEF DESCRIPTION OF DRAWINGS

[0018] The utility model will be further explained in detail in combination with the drawings.

[0019] Figure 1 It is structural schematic diagram of the utility model embodiment 1;

[0020] Figure 2 It is local section structure schematic diagram of the utility model embodiment 1;

[0021] Figure 3 It is the three-dimensional structure schematic diagram of the bolt of the utility model;

[0022] Figure 4 It is the structure schematic diagram when the anti-loose structure piece of embodiment 1 stops the fastening nut;

[0023] Figure 5 It is structural schematic diagram of the utility model embodiment 2;

[0024] Figure 6 It is structural schematic diagram of the utility model embodiment 3;

[0025] Figure 7 It is the structure schematic diagram of the protective cover of the utility model;

[0026] Figure 8 It is structural schematic diagram of the utility model embodiment 4.

[0027] Shown in the drawings: 1-bolt, 11-thread section, 12-screw section, 13-bolt head, 2-fastening nut, 21-outer nut, 22-inner nut, 3-anti-loose structure piece, 31-anti-loose nut, 32-fastening screw, 33-locking screw, 34-opening key groove, 35-first screw connection through hole, 36-second screw connection through hole, 4-semi-fluid grease, 5-protective cover, 51-first limit slot, 52-second limit slot, 53-third limit slot. DETAILED DESCRIPTION

[0028] The following describes the implementation of the present invention through specific embodiments. People familiar with this technology can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0029] It should be noted that the structures, proportions, sizes, etc. depicted in the drawings of this specification are only used to match the contents disclosed in this specification for the understanding and reading of those familiar with this technology. They are not used to limit the conditions for the implementation of this utility model and therefore have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed in this utility model without affecting the efficacy and purpose of the utility model. At the same time, the terms such as "upper", "lower", "left", "right", etc. quoted in this specification are only for the convenience of description and are not used to limit the scope of the implementation of this utility model. Changes or adjustments in their relative relationships should also be considered as the scope of the implementation of this utility model without substantially changing the technical content.

[0030] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "connected" and "provided with" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0031] It should be noted that the term "comprise" or any other variation is intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements that are inherent to such process, method, article or apparatus. Example 1

[0032] like Figures 1 to 4As shown, this embodiment provides an anti-loosening device for bolts used in engineering, including a bolt 1 and a fastening nut 2. The bolt 1 includes an integrally formed threaded section 11, a screw section 12, and a bolt head 13 fixed to the end of the screw section 12. The fastening nut 2 includes an outer nut 21 and an inner nut 22. The outer nut 21 and the inner nut 22 are respectively screwed to the threaded section 11 in the bolt 1. An anti-loosening structural member 3 that can be in contact with and connected to the outer nut 21 is provided in the threaded section 11. The anti-loosening structural member 3 includes an anti-loosening nut 31, a fastening screw 32, and a locking screw 33. An open keyway 34 that matches the fastening screw 32 is provided along the side surface of the threaded section 11. The open keyway 34 is provided in the threaded section 11 away from one end of the bolt head 13 and is located near the non-stressed portion of the top of the bolt 1. A first screw through hole 35 that matches the fastening screw 32 is provided on the side surface of the anti-loosening nut 31, and a locking screw 33 that matches the fastening screw 32 is provided on the top surface of the anti-loosening nut 31. The locking screw 33 matches the second threaded through hole 36, and the anti-loosening nut 31 can be detachably threaded on the threaded section 11 in the bolt 1, and the fastening screw 32 passes through the first threaded through hole 35 and is engaged with the open keyway 34 to achieve radial limitation of the anti-loosening nut 31; and the locking screw 33 passes downward through the second threaded through hole 36 in the anti-loosening nut 31, and can be in contact with the top surface of the outer nut 21 in the fastening nut 2 to achieve axial limitation of the outer nut 21 in the fastening nut 2.

[0033] Furthermore, an engineering bolt anti-loosening device described in this embodiment is used, and an oil storage chamber is formed between the anti-loosening nut 31 in the anti-loosening structural component 3 and the top surface of the bolt 1, and the oil storage chamber is filled with semi-fluid grease 4.

[0034] The anti-loosening device provided by this embodiment is used. In a specific application process, since the open keyway 34 provided in the threaded section 11 is located on the bolt 1 away from one end of the bolt head 13 and is located at a non-stressed position near the top of the bolt 1, it will not affect the mechanical properties of the bolt 1. The anti-loosening nut 31 threaded in the threaded section 11 is fixed by the fastening screw 32, so that the anti-loosening nut 31 can be radially limited to prevent the anti-loosening nut 31 from rotating in the opposite direction. The locking screw 33 is screwed into the second threaded through hole 36 in the anti-loosening nut 31 and extends downward to the bottom of the anti-loosening nut 31. The locking screw 33 is used to support the outer nut 21 in the fastening nut 2. Its structure is as follows Figure 4 As shown, this can achieve axial limitation of the outer nut 21 to prevent the outer nut 21 from continuing to rotate upward in the opposite direction. Through radial and axial limitation, this can further improve its anti-loosening effect and achieve the purpose of anti-loosening. Example 2

[0035] likeFigure 5 As shown, this embodiment is based on Example 1. In order to improve its anti-loosening effect and achieve the anti-loosening purpose, this embodiment provides an engineering bolt anti-loosening device, and the fastening screws 32 and locking screws 33 in the anti-loosening structural member 3 are each provided with two, wherein the two fastening screws 32 are symmetrically screwed on the outer surface of the anti-loosening nut 31 through the first screw through hole 35; and the two locking screws 33 are symmetrically screwed on the top surface of the anti-loosening nut 31 through the second screw through hole 36. At the same time, the anti-loosening nut 31 in the anti-loosening structural member 3 has the same structure as the outer nut 21 and the inner nut 22 in the fastening nut 2, both of which are hexagonal nut structures.

[0036] By using the anti-loosening device provided in this embodiment, during specific application, the two fastening screws 32 and locking screws 33 are configured, which not only can effectively prevent the anti-loosening nut 31 from rotating in the opposite direction, but also the two locking screws 33 can support the outer nut 21 in the fastening nut 2, so that the outer nut 21 can be axially limited to prevent the outer nut 21 from continuing to rotate in the opposite direction upward, which can further improve its anti-loosening effect and achieve the purpose of anti-loosening. Example 3

[0037] like Figure 6 and Figure 7 As shown, this embodiment is based on the embodiment 1, and is intended to improve the service life of the bolt 1, prevent the fastening screw 32 in the anti-loosening structure 3 from springing out during use, and achieve a fixed limit function for the anti-loosening nut 31. Fourth, it is intended to be waterproof and dustproof and enhance its lubrication effect, thereby achieving the purpose of protection. The anti-loosening device for engineering bolts provided by this embodiment also includes a protective cover 5 detachably connected to the anti-loosening structure 3. The protective cover 5 is configured as a cylindrical structure with an open bottom. The protective cover 5 is detachably placed on the outside of the anti-loosening nut 31 and is respectively in contact with the fastening screw 32 and the locking screw 33. At the same time, a limiting structure matching the fastening screw 32 is also provided on the inner wall surface of the protective cover 5. The fastening screw 32 is in contact with the inner wall surface of the protective cover 5 through the limiting structure, and the locking screw 33 is in contact with the inner top wall surface of the protective cover 5.

[0038] Furthermore, an engineering bolt anti-loosening device described in this embodiment is adopted, and the limiting structure includes a first limiting groove 51, a second limiting groove 52 and a third limiting groove 53, wherein the first limiting groove 51 and the third limiting groove 53 are arranged on the inner wall surface of the protective cover 5 along the axial direction, and the second limiting groove 52 is arranged on the inner wall surface of the protective cover 5 along the circumferential direction, the first limiting groove 51 and the third limiting groove 53 are connected through the second limiting groove 52, and the first limiting groove 51 extends downward to the bottom opening of the protective cover 5.

[0039] The anti-loose device provided by the embodiment is used in specific application. The protective cover 5 is configured. The inner side wall surface of the protective cover 5 is provided with a limiting structure matched with the fastening screw 32. The limiting structure is composed of the first limiting groove 51, the second limiting groove 52 and the third limiting groove 53 to form a “Z” shape structure. Thus, the protective cover 5 can be effectively prevented from shaking. The limiting structure limits the fastening screw 32. The fastening screw 32 can be effectively prevented from falling due to vibration and other external factors. The anti-loose nut 31 and the top surface of the bolt 1 form an oil storage chamber. The semi-fluid lubricating grease 4 is filled in the oil storage chamber. The semi-fluid lubricating grease 4 filled in the oil storage chamber can be used to lubricate the bolt 1 and the fastening nut 2. The protective cover 5 can also be used to prevent the fastening screw 32 from being ejected during use, thereby reducing the safety risk. Under the action of the protective cover 5 and the semi-fluid lubricating grease 4, dust and rust can be prevented. The bolt 1 and the fastening nut 2 can be protected, thereby prolonging the service life of the bolt. Embodiment 4

[0040] As shown in Figure 8 the embodiment is based on the embodiment 2. In order to prolong the service life of the bolt 1 and prevent the fastening screw 32 from being ejected during use, the anti-loose nut 31 is fixed and limited. In order to prevent water and dust, enhance the lubricating effect and achieve the purpose of protection, the anti-loose device for the bolt for engineering use provided by the embodiment further comprises a protective cover 5 detachably connected with the anti-loose structure 3. The protective cover 5 is the protective cover 5 described in the embodiment 3.

[0041] Because the existing finished bolt or the bolt in use generally does not configure a locking device, if locking is to be achieved, the existing and in-use bolts must be scrapped, causing great waste. The anti-loosening device solves the above problems without damaging the mechanical properties and structure of the existing bolt product. The anti-loosening structure 3 is configured in a detachable assembly manner. The anti-loosening nut 31 is screwed on the threaded section 11 in the bolt 1 and located above the fastening nut 2. The fastening screw 32 is screwed in the first screw hole 35, and the end thereof is clamped with the opening key groove 34 arranged in the bolt 1. Thus, the anti-loosening nut 31 is radially limited, and the anti-loosening nut 31 is prevented from rotating. Meanwhile, the locking screw 33 is screwed with the second screw hole 36 in the anti-loosening nut 31, and the end thereof extends downward below the anti-loosening nut 31. When the fastening nut 2 loosens, the fastening nut 2 moves upward along the threaded section 11 and abuts against the locking screw 33. Thus, the outer nut 21 in the fastening nut 2 is axially limited. Through the radial and axial limitation, the anti-loosening effect is further improved, and the purpose of anti-loosening is achieved.

[0042] In addition, the protective cover 5 is further configured, and a limiting structure is arranged in the protective cover 5. The limiting structure comprises a first limiting groove 51, a second limiting groove 52 and a third limiting groove 53. The limiting structure comprises a “Z” shape structure through the first limiting groove 51, the second limiting groove 52 and the third limiting groove 53. The fastening screw 32 on the side of the anti-loosening nut 31 is arranged in the third limiting groove 53 through the limiting structure. The protective cover not only has the protection effect of dustproof and rustproof, but also prevents the fastening screw 32 from falling out due to loosening, thereby enhancing the stability and safety. Finally, the oil storage chamber is formed between the anti-loosening nut 31 and the top surface of the bolt 1, and the semi-fluid lubricating grease 4 is filled in the oil storage chamber. The semi-fluid lubricating grease can lubricate the bolt 1 and the fastening nut 2, thereby prolonging the service life of the bolt 1 and the fastening nut 2.

[0043] Therefore, the anti-loosening device is detachable. The anti-loosening structure 3 and the protective cover 5 are arranged in the existing bolt. The fastening screw 32 is used to fix the anti-loosening nut 31. Thus, the anti-loosening nut 31 is radially limited, and the anti-loosening nut 31 is prevented from rotating in the reverse direction. The locking screw 33 abuts against the outer nut 21 in the fastening nut 2. Thus, the outer nut 21 is axially limited, and the outer nut 21 is prevented from rotating in the reverse direction. Through the radial and axial limitation, the anti-loosening effect is further improved, and the purpose of anti-loosening is achieved.

[0044] In summary, the anti-loose device, adopt the anti-loose, rain, dust and rust lubrication function in one of the anti-loose way, effectively solve the existing bolt and workpiece connection when the self-locking ability is low, often loose or although not easy to loosen but difficult to remove these two contradictory problems, through the setting of anti-loose device, without destroying the existing bolt product mechanical properties and structure under the premise of, can meet the requirements, in line with national standards, this is the highlight of the utility model, and it is the innovation point, its overall structure is simple, convenient operation, high reliability, good safety, high practical value, conducive to realize popularization and application.

[0045] The other details of the utility model are conventional techniques known to those skilled in the art.

[0046] The above is only the preferred embodiment of the utility model, and does not limit the utility model, and the utility model can have various changes and changes for those skilled in the art, and any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A bolt anti-loosening device for engineering, comprising a bolt (1) and a fastening nut (2), characterized in that: The bolt (1) includes an integrally formed threaded section (11), a screw section (12) and a bolt head (13) fixed to the end of the screw section (12); the fastening nut (2) includes an outer nut (21) and an inner nut (22); the outer nut (21) and the inner nut (22) are respectively screwed to the threaded section (11) in the bolt (1); an anti-loosening structure (3) that can be in contact with the outer nut (21) is provided in the threaded section (11); wherein the anti-loosening structure (3) includes an anti-loosening nut (31), a fastening screw (32) and a locking screw (33); an open keyway (34) matching the fastening screw (32) is provided along the side surface of the threaded section (11); the open keyway (34) is provided on the threaded section (11) away from the end of the bolt head (13) and is positioned At a non-stressed portion of the top of the bolt (1), a first threaded through hole (35) matching the fastening screw (32) is provided on the side of the anti-loosening nut (31), and a second threaded through hole (36) matching the locking screw (33) is provided on the top surface of the anti-loosening nut (31). The anti-loosening nut (31) is detachably threaded on the threaded section (11) in the bolt (1), and the fastening screw (32) passes through the first threaded through hole (35) and is engaged with the open keyway (34), thereby realizing radial limitation of the anti-loosening nut (31); and the locking screw (33) passes downward through the second threaded through hole (36) in the anti-loosening nut (31) and can be in contact with the top surface of the outer nut (21) in the fastening nut (2), thereby realizing axial limitation of the outer nut (21) in the fastening nut (2).

2. The bolt anti-loosening device for engineering use according to claim 1, characterized in that: An oil storage chamber is formed between the anti-loosening nut (31) in the anti-loosening structural component (3) and the top surface of the bolt (1), and the oil storage chamber is filled with semi-fluid grease (4).

3. The bolt anti-loosening device for engineering use according to claim 1, characterized in that: Two fastening screws (32) are provided in the anti-loosening structural component (3), and the two fastening screws (32) are symmetrically screwed onto the outer surface of the anti-loosening nut (31) through the first screw-connecting through-hole (35).

4. The bolt anti-loosening device for engineering use according to claim 1, characterized in that: Two locking screws (33) are provided in the anti-loosening structural component (3), and the two locking screws (33) are symmetrically screwed onto the top surface of the anti-loosening nut (31) through the second screw-connecting through-holes (36).

5. The bolt anti-loosening device for engineering use according to claim 1, characterized in that: The anti-loosening nut (31) in the anti-loosening structural member (3) has the same structure as the outer nut (21) and the inner nut (22) in the fastening nut (2), both of which are hexagonal nut structures.

6. A bolt anti-loosening device for engineering use according to any one of claims 1 to 5, characterized in that: The invention also includes a protective cover (5) detachably connected to the anti-loosening structure (3), wherein the protective cover (5) is configured as a cylindrical structure with an open bottom. The protective cover (5) is detachably placed on the outside of the anti-loosening nut (31) and is respectively in contact with the fastening screw (32) and the locking screw (33).

7. The bolt anti-loosening device for engineering use according to claim 6, characterized in that: A limiting structure matching the fastening screw (32) is also provided on the inner wall surface of the protective cover (5); the fastening screw (32) is in contact with and connected to the inner wall surface of the protective cover (5) through the limiting structure, while the locking screw (33) is in contact with and connected to the inner top wall surface of the protective cover (5).

8. The bolt anti-loosening device for engineering use according to claim 7, characterized in that: The limiting structure comprises a first limiting groove (51), a second limiting groove (52) and a third limiting groove (53), wherein the first limiting groove (51) and the third limiting groove (53) are arranged on the inner side wall surface of the protective cover (5) along the axial direction thereof, and the second limiting groove (52) is arranged on the inner side wall surface of the protective cover (5) along the circumferential direction thereof, the first limiting groove (51) and the third limiting groove (53) are communicated with each other through the second limiting groove (52), and the first limiting groove (51) extends downward to the bottom opening of the protective cover (5).

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