Bolt locking device for engineering

Abstract

The invention discloses an engineering bolt locking device which comprises a bolt and a fastening nut, the bolt comprises a threaded 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 in threaded connection with the threaded 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, the use requirement is met, the national standard is met, and the bolt is also an innovation point, is 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 invention relates to the technical field of bolt connection, and in particular to a bolt anti-loosening device for engineering. Background Art

[0002] Bolts are a widely used detachable fixed connection structure with the advantages of simple structure, reliable connection and convenient assembly and disassembly, so they are widely used in various industries. Commonly used bolts need to cooperate with nuts to be used to fasten and connect two parts with through holes. If the nut is unscrewed from the bolt, the two parts can be separated, so the bolt connection is a detachable connection. During the long-term use of bolts, the nuts often become loose due to the influence of various factors such as friction, vibration and temperature. The loose nuts will cause the bolts to fall off, which will not only affect the operation of the equipment, but may even cause safety accidents, posing a major safety hazard. Therefore, in order to avoid the loosening of the nuts, sometimes glue bonding or welding is used to fix them, but this method is difficult to disassemble the bolts, which makes maintenance and disassembly very difficult.

[0003] Especially in the field of tower cranes, tower cranes are essential special equipment on construction sites. They are different from other mechanical equipment because they are not only exposed to the atmosphere for a long time, but also have to withstand extreme environments such as wind-induced vibration, dancing, and line deicing. Once the fastening bolts and fastening nuts of the standard section become loose, they will fall, causing the tower crane to overturn, thus causing a major accident with mass casualties. Therefore, for tower cranes, anti-loosening of bolt connections is particularly important.

[0004] In order to prevent the bolts used in the tower crane field from loosening due to vibration during long-term use, the applicant applied for a patent on December 25, 2019, entitled "A threaded anti-loosening device", and the authorization announcement number of the patent is CN211117063U. In daily application, in order to facilitate use and achieve the purpose of anti-loosening, the applicant applied for another patent on August 27, 2020, entitled "A threaded anti-loosening device", and the authorization announcement number of the patent is CN212838901U. In order to facilitate disassembly and assembly and achieve the purpose of anti-loosening, the applicant applied for another patent on August 20, 2024, entitled "Anti-loosening bolt that is easy to disassemble", and the application publication number of the patent is CN118669406A. The above three patent documents are all improvements made by the applicant in daily application according to the purpose of bolt anti-loosening. In the existing engineering field, especially for tower cranes used in construction sites, a large number of bolts are needed, involving different bolt structures. In order to reduce costs, facilitate disassembly and installation, and meet the bolt use requirements in different engineering fields, the existing anti-loosening bolt structure is improved, thereby providing an engineering bolt anti-loosening device, which aims to simultaneously solve the two contradictory problems of low self-locking ability when the existing bolts are connected to the workpiece, frequent loosening, or difficult to loosen but difficult to disassemble. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an anti-loosening device with a simple structure and convenient disassembly and installation in response to the problems existing in the background technology. The anti-loosening device can effectively solve the two contradictory problems of low self-locking ability when the existing bolts are connected to the workpiece, frequent loosening, or difficult to disassemble although not easy to loosen, but also reduce the production cost, so as to meet the anti-loosening requirements of bolts for different engineering projects and effectively eliminate safety hazards. Specifically, it is an anti-loosening device for bolts for engineering projects.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a bolt anti-loosening device for engineering, including a bolt and a fastening nut, the bolt includes an integrally formed threaded section, a screw section and a bolt head fixed to the end of the screw section, the fastening nut includes an outer nut and an inner nut, the outer nut and the inner nut are respectively screwed on the threaded section in the bolt, and an anti-loosening structural part that can be in contact with the outer nut and connected is provided in the threaded section.

[0007] Furthermore, an anti-loosening device for engineering bolts described in the present invention is adopted, and the anti-loosening structural component includes an anti-loosening nut, a fastening screw and a locking screw. An open keyway matching the fastening screw is provided along the side of the threaded section, and the open keyway is arranged in the threaded section away from one end of the bolt head, and is located at a non-stressed position near the top of the bolt. A first threaded through hole matching the fastening screw is provided on the side of the anti-loosening nut, and a second threaded through hole matching the locking screw is provided on the top surface of the anti-loosening nut. The anti-loosening nut can be detachably screwed on the threaded section in the bolt, and the fastening screw passes through the first threaded through hole and is clamped with the open keyway to achieve radial limitation of the anti-loosening nut; and the locking screw passes downward through the second threaded through hole in the anti-loosening nut, and can be abutted and contacted with the top surface of the outer nut in the fastening nut to achieve axial limitation of the outer nut in the fastening nut.

[0008] Furthermore, an engineering bolt anti-loosening device according to the present invention is adopted, an oil storage chamber is formed between the anti-loosening nut in the anti-loosening structural component and the top surface of the bolt, and the oil storage chamber is filled with semi-fluid grease.

[0009] Furthermore, in an engineering bolt anti-loosening device described in the present invention, two fastening screws are provided in the anti-loosening structural member, and the two fastening screws are symmetrically screwed to the outer surface of the anti-loosening nut through the first screw through hole.

[0010] Furthermore, in an engineering bolt anti-loosening device described in the present invention, two locking screws are provided in the anti-loosening structural member, and the two locking screws are symmetrically threaded on the top surface of the anti-loosening nut through the second threaded through hole.

[0011] Furthermore, in the engineering bolt anti-loosening device described in the present invention, the anti-loosening nut in the anti-loosening structural component has the same structure as the outer nut and the inner nut in the fastening nut, both of which are hexagonal nut structures.

[0012] Furthermore, the engineering bolt anti-loosening device described in the present invention also includes a protective cover detachably connected to the anti-loosening structural member, the protective cover is arranged as a cylindrical structure with an open bottom, the protective cover is detachably sleeved on the outside of the anti-loosening nut, and is respectively contacted and connected with the fastening screw and the locking screw.

[0013] Furthermore, using the engineering bolt anti-loosening device described in the present invention, a limiting structure matching the fastening screw is provided on the inner wall surface of the protective cover, the fastening screw is in contact and connected with the inner wall surface of the protective cover through the limiting structure, and the locking screw is in contact and connected with the inner top wall surface of the protective cover.

[0014] Furthermore, an engineering bolt anti-loosening device described in the present invention is adopted, and the limiting structure includes a first limiting groove, a second limiting groove and a third limiting groove, wherein the first limiting groove and the third limiting groove are arranged on the inner wall surface of the protective cover along the axial direction, and the second limiting groove is arranged on the inner wall surface of the protective cover along the circumferential direction of the protective cover, the first limiting groove and the third limiting groove are connected through the second limiting groove, and the first limiting groove extends downward to the bottom opening of the protective cover.

[0015] Compared with the prior art, the invention provides a bolt anti-loosening device for engineering use, which has the following beneficial effects: according to relevant national standards, when the fastening nut in the bolt is locked, it is generally necessary to expose at least 3 to 5 threads on the bolt, and the open keyway provided in the threaded section is located at a non-stressed position near the top of the bolt, which will not affect the strength of the bolt. Through the anti-loosening structural member, a detachable assembly method is adopted, the anti-loosening nut is first screwed on the threaded section in the bolt and located above the fastening nut, and then the fastening screw is screwed into the first screw through hole, and its end is clamped with the open keyway provided in the bolt, so that the anti-loosening nut can be radially limited to prevent the anti-loosening nut from rotating; at the same time, the locking screw is screwed with the second screw through hole in the anti-loosening nut, and its end extends downward to the bottom of the anti-loosening nut. When the fastening nut is loose, it contacts the locking screw during the upward movement along the threaded section, so that the outer nut in the fastening nut can be axially limited. Through radial and axial limiting, the anti-loosening effect can be further improved to achieve the purpose of anti-loosening; in addition, since a protective cover is also configured and a limiting structure is provided in the protective cover, the limiting structure includes a first limiting groove, a second limiting groove and a third limiting groove. Through the set limiting structure, the fastening screw on the side of the anti-loosening nut can be set in the third limiting groove. The protective cover can not only play a dust and rust protection role, but also prevent the fastening screw from falling off due to loosening, thereby enhancing its stability and safety; finally, since an oil storage chamber is formed between the anti-loosening nut and the top surface of the bolt, and semi-fluid grease is filled in the oil storage chamber, the filled semi-fluid grease can be used to lubricate the bolts and the fastening nuts, thereby improving the service life of the bolts and the fastening nuts.

[0016] It can be seen that the anti-loosening device described in the present invention adopts a detachable manner, and the anti-loosening structure and protective cover are configured in the existing bolt, and the anti-loosening nut is fixed by a fastening screw, so that the anti-loosening nut can be radially limited to prevent the anti-loosening nut from rotating in the opposite direction; and the locking screw is used to support the outer nut in the fastening nut, so that the outer nut can be axially limited to prevent the outer nut from continuing to rotate in the opposite direction upward; through radial and axial limitation, the anti-loosening effect can be further improved, and the purpose of anti-loosening can be achieved.

[0017] To sum up, the anti-loosening device described in the present invention is adopted, and an anti-loosening method integrating anti-loosening, rainproof, dustproof and anti-rust lubrication functions is adopted, which effectively solves the two contradictory problems of low self-locking ability when the existing bolts are connected to the workpiece, frequent loosening or difficult to disassemble although not easy to loosen. Through the anti-loosening device set up, it can meet the use requirements and comply with national standards without destroying the mechanical properties and structure of the existing bolt products. This is the highlight of the present invention and also its innovation point. Its overall structure is simple, easy to operate, highly reliable, safe, and of high practical value, which is conducive to its promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention; Figure 2 It is a schematic diagram of a partial cross-sectional structure of Example 1 of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the bolt of the present invention; Figure 4 This is a schematic diagram of the structure when the anti-loosening structural member in Example 1 is against the fastening nut; Figure 5 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Figure 6 This is a schematic diagram of the structure of Embodiment 3 of the present invention; Figure 7 It is a schematic diagram of the structure of the protective cover of the present invention; Figure 8 This is a schematic diagram of the structure of Example 4 of the present invention.

[0020] As shown in the accompanying drawings: 1-bolt, 11-threaded section, 12-screw section, 13-bolt head, 2-fastening nut, 21-external nut, 22-inner nut, 3-anti-loosening structural member, 31-anti-loosening nut, 32-fastening screw, 33-locking screw, 34-open keyway, 35-first threaded through hole, 36-second threaded through hole, 4-semi-fluid grease, 5-protective cover, 51-first limiting groove, 52-second limiting groove, 53-third limiting groove. DETAILED DESCRIPTION

[0021] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0022] It should be noted that the structures, proportions, sizes, etc. drawn in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical content disclosed by the present invention. 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 the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[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 ordinary technicians in this field, 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 "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 other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus. Example 1

[0025] like Figures 1 to 4As shown, this embodiment provides a bolt anti-loosening device for engineering, including a bolt 1 and a fastening nut 2, wherein 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, and the fastening nut 2 includes an outer nut 21 and an inner nut 22, wherein the outer nut 21 and the inner nut 22 are respectively screwed on the threaded section 11 in the bolt 1, and an anti-loosening structural member 3 that can be in contact and connected with the outer nut 21 is provided in the threaded section 11. Among them, the anti-loosening structural member 3 includes an anti-loosening nut 31, a fastening screw 32 and a locking screw 33, and an open keyway 34 matching the fastening screw 32 is provided along the side surface of the threaded section 11, and the open keyway 34 is provided in the threaded section 11 away from one end of the bolt head 13, and is located at a non-stressed position near the top of the bolt 1, and a first screw connection through hole 35 matching the fastening screw 32 is provided on the side surface of the anti-loosening nut 31, and a locking screw 33 matching 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, so as 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 abutted and contacted with the top surface of the outer nut 21 in the fastening nut 2, so as to achieve axial limitation of the outer nut 21 in the fastening nut 2.

[0026] 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.

[0027] By using the anti-loosening device provided in this embodiment, in a specific application process, since the open keyway 34 arranged in the threaded section 11 is located on the bolt 1 at one end away from the bolt head 13 and at a non-stressed position close to 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; and the locking screw 33 is threaded in the second threaded through hole 36 in the anti-loosening nut 31 and extends downward to the bottom of the anti-loosening nut 31, and 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

[0028] like Figure 5 As shown, this embodiment is based on the embodiment 1. In order to improve its anti-loosening effect and achieve the anti-loosening purpose, this embodiment provides an engineering bolt anti-loosening device, in which two fastening screws 32 and locking screws 33 are provided in the anti-loosening structure 3, 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 structure 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.

[0029] By using the anti-loosening device provided in this embodiment, in a specific application process, the two fastening screws 32 and the locking screws 33 are configured, which can not only 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

[0030] like Figure 6 and Figure 7 As shown, this embodiment is based on the embodiment 1, firstly, to improve the service life of the bolt 1, secondly, to prevent the fastening screw 32 in the anti-loosening structure 3 from being elastic during use, thirdly, to achieve a fixed limit function for the anti-loosening nut 31, and fourthly, to achieve waterproof and dustproof, enhance its lubrication effect, so as to achieve the purpose of protection. The anti-loosening device for bolts for engineering provided by this embodiment also includes a protective cover 5 detachably connected to the anti-loosening structure 3, the protective cover 5 is set as a cylindrical structure with an opening at the bottom, the protective cover 5 is detachably sleeved 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.

[0031] 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 of the protective cover 5, 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.

[0032] By adopting the anti-loosening device provided in this embodiment, in a specific application process, the protective cover 5 is configured. Since a limiting structure matching the fastening screw 32 is provided on the inner wall surface of the protective cover 5, the limiting structure forms a "Z"-shaped structure through the first limiting groove 51, the second limiting groove 52 and the third limiting groove 53, which can effectively prevent the protective cover 5 from shaking, and the fastening screw 32 is limited by the limiting structure, which can effectively prevent the fastening screw 32 from falling off after being loosened due to external factors such as vibration. At the same time, due to the formation between the anti-loosening nut 31 and the top surface of the bolt 1 There is an oil storage chamber, and the oil storage chamber is filled with semi-fluid grease 4, so that the semi-fluid grease 4 filled in the oil storage chamber can be used to lubricate the bolt 1 and the fastening nut 2, and the protective cover 5 can also be used to prevent the fastening screw 32 from being elastic during use, thereby reducing safety risks. At the same time, under the action of the protective cover 5 and the semi-fluid grease 4, it can not only prevent dust and rust, but also has anti-collision, waterproof, dustproof, automatic refueling and no-cleaning functions. By protecting the bolt 1 and the fastening nut 2, the service life of the bolt is improved. Example 4

[0033] like Figure 8 As shown, this embodiment is based on the embodiment 2, in order to increase the service life of the bolt 1, prevent the fastening screw 32 from bouncing outward during use, achieve the fixed limit effect on the anti-loosening nut 31, and to be waterproof and dustproof and enhance its lubrication effect, thereby achieving the purpose of protection. An engineering bolt anti-loosening device provided in this embodiment is adopted, which also includes a protective cover 5 detachably connected to the anti-loosening structural member 3, and the protective cover 5 can be the protective cover 5 described in the embodiment 3.

[0034] Since the existing finished bolts or the bolts in use are generally not equipped with a locking device, if locking and anti-loosening is to be achieved, the bolts with anti-loosening devices must be remade, and the existing and in-use bolts must be scrapped, causing a great waste. The anti-loosening device of the present invention can easily solve the above problem without destroying the mechanical properties and structure of the existing bolt products. Through the anti-loosening structural member 3, a detachable assembly method is adopted. First, the anti-loosening nut 31 is screwed on the threaded section 11 in the bolt 1 and is located above the fastening nut 2. Then, the fastening screw 32 is screwed into the first screw-connected through hole 35, and its end is engaged with the open keyway 34 set in the bolt 1. In this way, the anti-loosening nut 31 can be radially limited to prevent the anti-loosening nut 31 from rotating. At the same time, the locking screw 33 is screwed into the second screw-connected through hole 36 in the anti-loosening nut 31, and its end extends downward to the bottom of the anti-loosening nut 31. When the fastening nut 2 is loose, it moves up along the threaded section 11 and contacts with the locking screw 33. In this way, the outer nut 21 in the fastening nut 2 can be axially limited. Through radial and axial limitation, the anti-loosening effect can be further improved to achieve the purpose of anti-loosening.

[0035] In addition, since a protective cover 5 is also configured, and a limiting structure is provided in the protective cover 5, the limiting structure includes a first limiting groove 51, a second limiting groove 52 and a third limiting groove 53, and the limiting structure forms a "Z"-shaped structure through the first limiting groove 51, the second limiting groove 52 and the third limiting groove 53. Through the set limiting structure, the fastening screw 32 on the side of the anti-loosening nut 31 can be set in the third limiting groove 53. The protective cover can not only play a dust and rust protection role, but also prevent the fastening screw 32 from falling off due to loosening, thereby enhancing its stability and safety; finally, since an oil storage chamber is formed between the anti-loosening nut 31 and the top surface of the bolt 1, and the semi-fluid grease 4 is filled in the oil storage chamber, the semi-fluid grease filled can be used to lubricate the bolt 1 and the fastening nut 2, thereby improving the service life of the bolt 1 and the fastening nut 2.

[0036] It can be seen that the anti-loosening device described in the present invention is adopted in a detachable manner. By configuring the anti-loosening structural member 3 and the protective cover 5 in the existing bolt, the anti-loosening nut 31 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; and the locking screw 33 is used to 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; through radial and axial limitation, the anti-loosening effect can be further improved to achieve the purpose of anti-loosening.

[0037] To sum up, the anti-loosening device described in the present invention is adopted, and an anti-loosening method integrating anti-loosening, rainproof, dustproof and anti-rust lubrication functions is adopted, which effectively solves the two contradictory problems of low self-locking ability when the existing bolts are connected to the workpiece, frequent loosening or difficult to disassemble although not easy to loosen. Through the anti-loosening device set up, it can meet the use requirements and comply with national standards without destroying the mechanical properties and structure of the existing bolt products. This is the highlight of the present invention and also its innovation point. Its overall structure is simple, easy to operate, highly reliable, safe, and of high practical value, which is conducive to its promotion and application.

[0038] Other aspects of the present invention that are not described in detail are all conventional techniques known to those skilled in the art.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A bolt anti-loosening device for engineering, comprising a bolt (1) and a fastening nut (2), characterized in that: The bolt (1) comprises 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) comprises an outer nut (21) and an inner nut (22); the outer nut (21) and the inner nut (22) are respectively screwed onto the threaded section (11) in the bolt (1); and an anti-loosening structural member (3) which can be in contact with the outer nut (21) is provided in the threaded section (11).

2. The bolt anti-loosening device for engineering use according to claim 1, characterized in that: The anti-loosening structural component (3) comprises 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) at one end away from the bolt head (13) and is located at a non-stressed portion of the top of the bolt (1); a first screw-connecting through hole (35) matching the fastening screw (32) is provided on the side surface of the anti-loosening nut (31); and a locking screw (33) matching the fastening screw (32) is provided on the top surface of the anti-loosening nut (31). The locking screw (33) is connected to the second threaded through hole (36) of the locking nut (31) so as to be connected with the outer nut (21) in the fastening nut (2) and ... and the second threaded through hole (36) and the second threaded through hole (36) and the second threaded through hole (36) and the second threaded through hole (36) and the second threaded through hole (36) and the second threaded through hole (36) and the second threaded through hole (36) and the second threaded through hole (36) and the second threaded through hole (36) and the second threaded through hole (36) and the second threaded through hole (36) and the second threaded through hole (36) and the second threaded through hole (36) and the second threaded through hole (36) and the second threaded through hole (36) 3. The bolt anti-loosening device for engineering use according to claim 2, 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).

4. The bolt anti-loosening device for engineering use according to claim 2, characterized in that: Two fastening screws (32) are provided in the anti-loosening structural component (3), and the two fastening screws (32) are symmetrically threadedly connected to the outer surface of the anti-loosening nut (31) through the first threaded through hole (35).

5. The bolt anti-loosening device for engineering use according to claim 2, characterized in that: Two locking screws (33) are provided in the anti-loosening structural component (3), and the two locking screws (33) are symmetrically threadedly connected to the top surface of the anti-loosening nut (31) through the second threaded through holes (36).

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

7. A bolt anti-loosening device for engineering use according to any one of claims 1 to 6, characterized in that: It 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, and the protective cover (5) is detachably sleeved on the outside of the anti-loosening nut (31) and is respectively in contact with the fastening screw (32) and the locking screw (33).

8. The bolt anti-loosening device for engineering use according to claim 7, 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) via 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).

9. The bolt anti-loosening device for engineering use according to claim 8, 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 wall surface of the protective cover (5) along the axial direction thereof, and the second limiting groove (52) is arranged on the inner wall surface of the protective cover (5) along the circumferential direction thereof, the first limiting groove (51) and the third limiting groove (53) are connected via 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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