CN111577736B - Bolt and nut assemblies - Google Patents
Bolt and nut assemblies Download PDFInfo
- Publication number
- CN111577736B CN111577736B CN202010474627.6A CN202010474627A CN111577736B CN 111577736 B CN111577736 B CN 111577736B CN 202010474627 A CN202010474627 A CN 202010474627A CN 111577736 B CN111577736 B CN 111577736B
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- Prior art keywords
- threaded rod
- nut
- bolt
- threads
- fastener
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
- F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
- F16B39/24—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by means of washers, spring washers, or resilient plates that lock against the object
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
- Connection Of Plates (AREA)
Abstract
本发明实施例提出一种螺栓螺母组件，涉及机械紧固技术领域。螺栓螺母组件包括螺栓本体、紧固件、第一锁紧螺母和第二锁紧螺母。螺栓本体包括主螺纹杆和次螺纹杆；第二锁紧螺母的螺纹孔与主螺纹杆的螺纹进行螺纹配合连接；紧固件凹设有预留槽，预留槽的底部开设有贯通的避让孔，次螺纹杆穿过并伸出避让孔，并且预留槽开口处的紧固件端面与第二锁紧螺母抵持，预留槽是呈空洞状态；第一锁紧螺母的螺纹孔与次螺纹杆的螺纹进行螺纹配合连接。第二锁紧螺母和第一锁紧螺母之间锁紧紧固件，在锁紧件受到挤压时，使得锁紧件强烈弹性反弹，以迫使螺栓本体、第二锁紧螺母、紧固件、第一锁紧螺母连接为更稳固的整体结构，从而达到防止松动的技术效果。
The embodiment of the present invention proposes a bolt and nut assembly, which relates to the technical field of mechanical fastening. The bolt and nut assembly includes a bolt body, a fastener, a first locking nut and a second locking nut. The bolt body includes a main threaded rod and a secondary threaded rod; the threaded hole of the second locking nut is threadedly matched with the thread of the main threaded rod; the fastener is recessed with a reserved groove, and a through avoidance hole is opened at the bottom of the reserved groove, and the secondary threaded rod passes through and extends out of the avoidance hole, and the end face of the fastener at the opening of the reserved groove abuts against the second locking nut, and the reserved groove is in a hollow state; the threaded hole of the first locking nut is threadedly matched with the thread of the secondary threaded rod. The fastener is locked between the second locking nut and the first locking nut, and when the locking member is squeezed, the locking member rebounds strongly elastically, so as to force the bolt body, the second locking nut, the fastener, and the first locking nut to be connected into a more stable overall structure, thereby achieving a technical effect of preventing loosening.
Description
Technical Field
The embodiment of the invention relates to the technical field of mechanical fastening, in particular to a bolt and nut assembly.
Background
Bolts and nuts are mechanical parts, and the cooperation of bolts and nuts can be used to fixedly connect multiple parts, which connection is called bolting.
Bolt connections are widely used in machine equipment, however, prior art bolt and nut assemblies tend to loosen between the bolt and nut during long periods of operation of the machine when assembled to the machine, thereby making the parts on the machine unstable.
Disclosure of Invention
The embodiment of the invention aims to provide a bolt and nut assembly, which can solve the technical problem that the bolt and nut assembly is easy to loose in the use process in the prior art.
The embodiment of the invention adopts the following technical scheme:
A bolt and nut assembly comprising:
The bolt comprises a bolt body, wherein the bolt body comprises a main threaded rod and a secondary threaded rod, threads are arranged on the outer side of the main threaded rod, one end of the main threaded rod extends outwards to form the secondary threaded rod, and threads are arranged on the outer side of the secondary threaded rod;
The first locking nut is provided with a threaded hole;
the second locking nut is provided with a threaded hole, and the threaded hole of the second locking nut is in threaded fit connection with the thread of the main threaded rod;
the fastener, the concave reservation groove that is equipped with of fastener, the hole of dodging that link up has been seted up to the bottom of reservation groove, the opening orientation of reservation groove second lock nut, secondary threaded rod passes and stretches out dodge the hole, and reservation groove opening part the fastener terminal surface with second lock nut supports and holds, the reservation groove is the cavity state:
the threaded hole of the first locking nut is in threaded fit connection with the thread of the secondary threaded rod.
Optionally, the primary threaded rod is cylindrical, threads spirally extend along the length direction of the primary threaded rod, one end of the secondary threaded rod in the length direction of the threaded rod is outwardly extended, and the secondary threaded rod is cylindrical and spirally extends along the length direction of the secondary threaded rod.
Optionally, the one end extension that the primary threaded rod kept away from secondary threaded rod is provided with the bolt cap, the bolt cap the primary threaded rod with secondary threaded rod integrated into one piece sets up.
Optionally, the screw direction of the screw thread located at the primary threaded rod is opposite to the screw direction of the screw thread located at the secondary threaded rod.
Optionally, the pitch of the thread located in the primary threaded rod is different from the pitch of the thread located in the secondary threaded rod.
Optionally, the fastening piece is in a cover-shaped structure, and the reserved groove is concavely formed along the length direction of the fastening piece from one end surface of the fastening piece.
Optionally, the opening part of the reserve tank is provided with threads, one side of the second locking nut is convexly provided with an annular boss, the outer side surface of the annular boss is provided with threads, and the threads positioned on the annular boss are in threaded fit connection with the threads positioned at the opening part of the reserve tank.
Optionally, the secondary threaded rod has a smaller thread diameter than the primary threaded rod, the relief hole has a larger thread diameter than the secondary threaded rod, and the relief hole has a smaller thread diameter than the primary threaded rod.
Optionally, the first locking nut is provided with one or more through holes, correspondingly, the fastening piece is provided with locking holes corresponding to the one or more through holes, and the bolt and nut assembly further comprises one or more fastening screws, wherein the fastening screws penetrate through the through holes and are in threaded fit connection with the locking holes.
The bolt and nut assembly comprises a main threaded rod, a first locking nut, a second locking nut, a first clamping nut, a second clamping nut and a second clamping nut, wherein the first clamping nut is in threaded fit connection with the main threaded rod, threads are formed on the outer side surface of the second locking nut, the second clamping nut is in threaded fit connection with the outer side surface of the second locking nut, and the first clamping nut and the second clamping nut are in abutting fixation.
Compared with the prior art, in the bolt-nut assembly of the embodiment, the bolt body comprises a main threaded rod and a secondary threaded rod which are integrally connected. The utility model discloses a screw thread locking device, including main threaded rod, secondary threaded rod, second lock nut, reservation groove, fastener terminal surface, second lock nut, reservation groove opening part, first lock nut's screw thread and the screw thread that is located the main threaded rod carries out screw thread fit connection, the opening orientation of reservation groove second lock nut, secondary threaded rod passes and stretches out dodge the hole, and reservation groove opening part the fastener terminal surface with second lock nut supports, the reservation groove is the cavity state, the screw thread of first lock nut with be located the screw thread of secondary threaded rod carries out screw thread fit connection. Therefore, the fastener is locked between the second lock nut and the first lock nut, the reserved groove in the fastener is in a hollow state, and when the locking piece is extruded, the locking piece is enabled to strongly and elastically rebound, so that the bolt body, the second lock nut, the fastener and the first lock nut are forced to be connected into a firmer integral structure, and the technical effect of preventing loosening is achieved.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.
FIG. 1 is a schematic view of a bolt and nut assembly according to one embodiment of the present invention;
FIG. 2 is a schematic view of a bolt and nut assembly according to another embodiment of the present invention;
FIG. 3 is a schematic view of the first lock nut shown in FIG. 2;
Fig. 4 is a schematic structural view of a bolt-nut assembly according to another embodiment of the present invention.
Detailed Description
In order that the invention may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. It will be understood that when an element is referred to as being "fixed" to another element, it can be directly on the other element or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "upper," "lower," "inner," "outer," "vertical," "horizontal," and the like as used in this specification, refer to an orientation or positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not denote or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.
In addition, the technical features mentioned in the different embodiments of the invention described below can be combined with one another as long as they do not conflict with one another.
Referring to fig. 1-4, an embodiment of the present invention provides a locking bolt-nut assembly 100, wherein the components of the bolt-nut assembly 100 are connected in a matching manner, so that the bolt-nut assembly 100 has a strong stability.
Referring to fig. 1, the bolt-nut assembly 100 includes a bolt body 10, a fastener 20, a first lock nut 30, and a second lock nut 40. The bolt body 10 is the metal material, the bolt body 10 includes main threaded rod 11 and secondary threaded rod 12, wherein, main threaded rod 11 is cylindrically the outside of main threaded rod 11 is provided with the edge main threaded rod 11 length direction screw extension's screw thread the outside extension of threaded rod length direction one end has secondary threaded rod 12. The secondary threaded rod 12 is cylindrical, and threads extending helically along the length direction of the secondary threaded rod 12 are arranged on the outer side of the secondary threaded rod 12, wherein the thread diameter of the secondary threaded rod 12 is smaller than that of the primary threaded rod 11. Further, a bolt cap 13 is extended from an end of the main threaded rod 11 away from the sub threaded rod 12, for example, the bolt body 10 is a hexagonal bolt, that is, the cross section of the bolt cap 13 is a regular hexagon. Optionally, the bolt cap 13, the primary threaded rod 11 and the secondary threaded rod 12 are integrally formed, and may be formed by casting at one time through a casting process.
Wherein the screw direction of the screw of the main screw rod 11 is opposite to the screw direction of the screw of the sub screw rod 12. And/or the pitch of the thread of the primary threaded rod 11 is different from the pitch of the thread of the secondary threaded rod 12, for example, the pitch of the thread of the primary threaded rod 11 is greater than the pitch of the thread of the secondary threaded rod 12, or the pitch of the thread of the primary threaded rod 11 is less than the pitch of the thread of the secondary threaded rod 12.
In other embodiments, the screw direction of the screw thread of the primary threaded rod 11 is opposite to the screw direction of the screw thread of the secondary threaded rod 12, the screw pitch of the screw thread of the primary threaded rod 11 is the same as the screw pitch of the screw thread of the secondary threaded rod 12, or the screw direction of the screw thread of the primary threaded rod 11 is the same as the screw direction of the screw thread of the secondary threaded rod 12, and the screw pitch of the screw thread of the primary threaded rod 11 is different from the screw pitch of the screw thread of the secondary threaded rod 12.
In this embodiment, the second lock nut 40 is made of metal, and the second lock nut 40 is provided with a threaded hole, and optionally, a through threaded hole is provided in the middle of the second lock nut 40. The threaded hole of the second lock nut 40 is in threaded fit connection with the thread of the main threaded rod 11, so that the second lock nut 40 is sleeved on the main threaded rod 11.
The fastening piece 20 is made of metal, the fastening piece 20 is in a cover-shaped structure, the outer contour of the fastening piece 20 is in a regular geometric figure, for example, the cross section of the fastening piece 20 is in a regular hexagon shape or a round shape. From an end face of the fastener 20, a reserved groove 21 is concavely formed along the length direction of the fastener 20, an opening of the reserved groove 21 faces the second lock nut 40, the end face of the fastener 20 at the opening of the reserved groove 21 abuts against the second lock nut 40, and the reserved groove 21 is in a hollow state. In this embodiment, the pre-groove 21 is cylindrical, a thread is disposed at an opening of the pre-groove 21, an annular boss 41 is protruding on one side of the second lock nut 40, and a thread is disposed on an outer side surface of the annular boss 41. The threads on the annular boss 41 are in threaded engagement with the threads on the opening of the recess 21. The bottom of reservation groove 21 has seted up the hole 22 of dodging that link up, dodge the aperture ratio of hole 22 the screw diameter of secondary threaded rod 12 is big, and dodge the aperture ratio of hole 22 the screw diameter of primary threaded rod 11 is little, so that secondary threaded rod 12 can pass dodge hole 22, and dodge the hole 22 can hinder primary threaded rod 11 passes, thereby fastener 20 can block bolt body 10 is further to secondary threaded rod 12 one side removes, wherein, the terminal surface of primary threaded rod 11 supports and holds the bottom of reservation groove 21.
In other embodiments, the relief hole 22 is provided with threads, and the relief hole 22 is in threaded engagement with the secondary threaded rod 12.
The first lock nut 30 is made of metal, a threaded hole is formed in the first lock nut 30, and the threaded hole of the first lock nut 30 is in threaded fit connection with the thread of the secondary threaded rod 12. The second lock nut 40 is screwed into the main threaded rod 11, the secondary threaded rod 12 passes through and extends out of the avoidance hole 22, the thread at the opening of the reserved groove 21 is in threaded fit connection with the thread of the annular boss 41, the fastener 20 is abutted to the second lock nut 40, and the first lock nut 30 is screwed into the secondary threaded rod 12, so that the bolt body 10, the second lock nut 40, the fastener 20 and the first lock nut 30 are connected into an integral structure, the bolt and nut assembly 100 has stronger stability, and the technical effect of looseness prevention is achieved.
Further, referring to fig. 2-3, the first lock nut 30 is provided with one or more through holes 31 therethrough, and accordingly, the fastener 20 is provided with lock holes 23 corresponding to the positions of the one or more through holes 31. The bolt-nut assembly 100 further includes one or more fastening screws 50, wherein the fastening screws 50 pass through the through holes 31 and are in threaded engagement with the locking holes 23, so as to enhance the firmness between the first locking nut 30 and the fastening member 20. Optionally, the first lock nut 30 is a hexagonal nut, a threaded hole in the middle of the first lock nut 30 is provided to be in threaded fit with the secondary threaded rod 12, and if the number of through holes 31 is plural, the plural through holes 31 are uniformly distributed along the circumference of the threaded hole of the first lock nut 30.
Further, referring to fig. 4, the bolt-nut assembly 100 further includes a first tightening nut 61 and a second tightening nut 62. The first tightening nut 61 is in threaded fit connection with the main threaded rod 11, the outer side surface of the second locking nut 40 is provided with threads, and the second tightening nut 62 is in threaded fit connection with the outer side surface of the second locking nut 40. The first tightening nut 61 is screwed into the main threaded rod 11 (i.e., the first tightening nut 61 is in threaded fit connection with the main threaded rod 11), the second tightening nut 62 is in threaded fit connection with the outer side surface of the second locking nut 40, and the first tightening nut 61 and the second tightening nut 62 are in abutting fixation, so as to enhance the stability of the bolt-nut assembly 100.
In this embodiment, a method for using the bolt-nut assembly 100 is provided as follows:
the first tightening nut 61 is screwed into the main threaded rod 11, the second tightening nut 40 is screwed into the main threaded rod 11, the secondary threaded rod 12 passes through and extends out of the avoidance hole 22, threads at the opening of the reserved groove 21 are in threaded fit connection with threads of the annular boss 41, the fastener 20 is abutted with the second tightening nut 40, the first tightening nut 30 is screwed into the secondary threaded rod 12, the second tightening nut 62 is screwed into the second tightening nut 40, namely, the second tightening nut 62 is in threaded fit connection with threads on the outer side surface of the second tightening nut 40, and the first tightening nut 61 and the second tightening nut 62 are abutted and fixed. In this embodiment, when the loosening abnormality occurs in the bolt body 10, since the screw direction of the screw of the main screw rod 11 is opposite to the screw direction of the screw of the sub screw rod 12, or the screw pitch of the screw of the main screw rod 11 is different from the screw pitch of the screw of the sub screw rod 12, the fastener 20 is more strongly locked between the second lock nut 40 and the first lock nut 30. Meanwhile, the reserved groove 21 in the fastener 20 is in a hollow state, when the locking member is pressed, the locking member is made to rebound strongly and elastically, so that the bolt body 10, the second locking nut 40, the fastener 20 and the first locking nut 30 are forced to be connected into a more stable integral structure, and thus the technical effect of preventing loosening is achieved.
It should finally be noted that the above embodiments are only intended to illustrate the technical solution of the present invention and not to limit it, that the technical features of the above embodiments or of the different embodiments may be combined in any order, and that many other variations in the different aspects of the present invention as described above exist, which are not provided in details for the sake of brevity, and that although the invention has been described in the detailed description with reference to the foregoing embodiments, it should be understood by those skilled in the art that it may still make modifications to the technical solution described in the foregoing embodiments or equivalent to some of the technical features thereof, where these modifications or substitutions do not depart from the essence of the corresponding technical solution from the scope of the technical solution of the embodiments of the present invention.
Claims (7)
1. A bolt and nut assembly comprising:
The bolt comprises a bolt body, wherein the bolt body comprises a main threaded rod and a secondary threaded rod, threads are arranged on the outer side of the main threaded rod, one end of the main threaded rod extends outwards to form the secondary threaded rod, and threads are arranged on the outer side of the secondary threaded rod;
The first locking nut is provided with a threaded hole;
the second locking nut is provided with a threaded hole, and the threaded hole of the second locking nut is in threaded fit connection with the thread of the main threaded rod;
The fastener is concavely provided with a reserved groove, the bottom of the reserved groove is provided with a through avoidance hole, the opening of the reserved groove faces the second lock nut, the secondary threaded rod passes through and extends out of the avoidance hole, the end face of the fastener at the opening of the reserved groove is propped against the second lock nut, and the reserved groove is in a hollow state;
The threaded hole of the first locking nut is in threaded fit connection with the thread of the secondary threaded rod;
The main threaded rod is cylindrical, threads spirally extend along the length direction of the main threaded rod, and one end of the secondary threaded rod in the length direction of the threaded rod is outwardly extended;
the spiral direction of the threads of the main threaded rod is opposite to the spiral direction of the threads of the secondary threaded rod;
The bolt and nut assembly further comprises a first tightening nut and a second tightening nut, the first tightening nut is in threaded fit connection with the main threaded rod, threads are arranged on the outer side surface of the second locking nut, the second tightening nut is in threaded fit connection with the outer side surface of the second locking nut, and the first tightening nut and the second tightening nut are in supporting and fixing.
2. The bolt and nut assembly according to claim 1, wherein the end of the primary threaded rod remote from the secondary threaded rod is provided with a bolt cap in an extending manner, and the bolt cap, the primary threaded rod and the secondary threaded rod are integrally formed.
3. The bolt and nut assembly of claim 1 wherein the pitch of the threads on the primary threaded rod is different from the pitch of the threads on the secondary threaded rod.
4. The bolt and nut assembly according to claim 1, wherein the fastener is of a hood-like configuration, and the recess is recessed from an end face of the fastener along a length of the fastener.
5. The bolt and nut assembly according to claim 4, wherein threads are arranged at the opening of the reserved groove, an annular boss is arranged on one side of the second locking nut in a protruding mode, threads are arranged on the outer side surface of the annular boss, and the threads located on the annular boss are in threaded fit connection with the threads located at the opening of the reserved groove.
6. The bolt and nut assembly of claim 1, wherein the minor threaded rod has a smaller thread diameter than the major threaded rod, the relief hole has a larger aperture than the minor threaded rod, and the relief hole has a smaller aperture than the major threaded rod.
7. The bolt and nut assembly according to claim 1, wherein the first lock nut is provided with one or more through holes therethrough, and the fastener is provided with a locking hole corresponding to the one or more through holes, and the bolt and nut assembly further comprises one or more fastening screws passing through the through holes and being in threaded engagement with the locking hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010474627.6A CN111577736B (en) | 2020-05-29 | 2020-05-29 | Bolt and nut assemblies |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010474627.6A CN111577736B (en) | 2020-05-29 | 2020-05-29 | Bolt and nut assemblies |
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| Publication Number | Publication Date |
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| CN111577736A CN111577736A (en) | 2020-08-25 |
| CN111577736B true CN111577736B (en) | 2025-02-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010474627.6A Active CN111577736B (en) | 2020-05-29 | 2020-05-29 | Bolt and nut assemblies |
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| CN (1) | CN111577736B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115681287B (en) * | 2022-09-15 | 2025-12-12 | 西北工业大学 | A bolt for use with a wedge-threaded nut. |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105257667A (en) * | 2015-09-29 | 2016-01-20 | 玉环胜友工具有限公司 | Looseness-proof machinery fastening mechanism |
| CN108425932A (en) * | 2018-05-15 | 2018-08-21 | 湖北振邦高新技术有限公司 | A kind of high iron catenary self-locking device |
| CN212479862U (en) * | 2020-05-29 | 2021-02-05 | 陶金波 | Bolt and nut assembly |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05288210A (en) * | 1992-04-07 | 1993-11-02 | Michiko Ueda | Locking nut |
| CN208778454U (en) * | 2018-08-15 | 2019-04-23 | 吴雁南 | A kind of anti-loose fastener of compound thread |
-
2020
- 2020-05-29 CN CN202010474627.6A patent/CN111577736B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105257667A (en) * | 2015-09-29 | 2016-01-20 | 玉环胜友工具有限公司 | Looseness-proof machinery fastening mechanism |
| CN108425932A (en) * | 2018-05-15 | 2018-08-21 | 湖北振邦高新技术有限公司 | A kind of high iron catenary self-locking device |
| CN212479862U (en) * | 2020-05-29 | 2021-02-05 | 陶金波 | Bolt and nut assembly |
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| CN111577736A (en) | 2020-08-25 |
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