阅读说明：本技术 一种可拆卸双螺纹卡紧型防松螺母 (Detachable double-thread clamping type locknut ) 是由 詹昌海 曹东兴 于 2021-05-25 设计创作，主要内容包括：本发明公开了一种可拆卸双螺纹卡紧型防松螺母,包括螺栓、主螺母、弹簧、同步卡壳和卡紧螺母等。将常规螺栓尾段螺纹处重新切割出新的螺纹槽,在不影响主螺母的正常装配的情况下,通过卡紧螺母实现双螺距卡紧。同步卡壳嵌套在主螺母上,能在正常情况下刚好后移一端,卡住卡紧螺母。螺栓尾段螺纹处重新切割出新的螺纹槽后可依次旋进主螺母和卡紧螺母,由于主螺母和卡紧螺母螺纹旋向和螺距都不同。由于螺母受力主要集中在前3牙,因此充分利用后半段螺纹用于安装卡紧螺母,在不影响强度的前提下摆脱了螺母装配对于预紧力以及螺纹之间摩擦力的高要求,虽然对加工难度有所提高,但对使用者要求大大降低,同时防松效果可靠,稳定性强。(The invention discloses a detachable double-thread clamping type locknut which comprises a bolt, a main nut, a spring, a synchronous clamping shell, a clamping nut and the like. And a new thread groove is cut at the thread part of the tail section of the conventional bolt again, and double-pitch clamping is realized through the clamping nut under the condition of not influencing the normal assembly of the main nut. The synchronous clamping shell is nested on the main nut, and one end of the synchronous clamping shell can be moved backwards just under normal conditions to clamp the clamping nut. And after a new thread groove is cut at the thread position of the tail section of the bolt again, the main nut and the clamping nut can be screwed in sequence, and the thread turning direction and the thread pitch of the main nut and the clamping nut are different. Because the nut atress is mainly concentrated on first 3 teeth, consequently make full use of back half section screw thread is used for installing the chucking nut, has swung under the prerequisite that does not influence intensity and has taken off the high requirement of nut assembly to pretightning force and frictional force between the screw thread, though improve to some extent the processing degree of difficulty, nevertheless require greatly reduced to the user, locking effect is reliable simultaneously, and stability is strong.)

1. The utility model provides a can dismantle double thread chucking type locknut which characterized in that: the synchronous clamping nut comprises a bolt (1), main nuts (3), springs (5), synchronous clamping shells (8) and clamping nuts (9), wherein four main nut convex blocks (4) are welded on the upper surface and the lower surface of each main nut (3), one spring (5) and one synchronous clamping shell convex block (7) are clamped between the two main nut convex blocks (4) on the surface of each main nut (3), the two synchronous clamping shell convex blocks (7) are welded and connected in a synchronous clamping shell welding groove (6), one main nut (3) and the two springs (5) form a whole in a clamping fit mode through the two synchronous clamping shell convex blocks (7), the synchronous clamping shell (8) extends backwards under the thrust of the springs (5) to form a small section for embedding and sleeving the clamping nuts (9), and the main nuts (3) and the clamping nuts (9) synchronously rotate, namely, and have the same rotation angle and rotation direction; when the nut is disassembled, the synchronous clamping shell (8) is pushed forwards to separate the clamping nut (9) from the synchronous clamping shell (8), so that the clamping nut (9) can move freely relative to the main nut (3); a clamping thread groove (11) is cut at the tail section of the first thread of the bolt (1), and a clamping thread (10) is arranged on the clamping nut (9) and is used for being matched with the clamping thread groove (11) on the bolt (1).

2. A removable double-threaded gripping type locknut as claimed in claim 1, further characterized by: a clamping thread groove (11) is cut at the thread position of the tail section of the bolt again, and double-thread clamping is realized through a clamping nut (9) without influencing the assembly of the main nut (3); when the main nut (3) and the clamping nut (9) rotate in place, the main nut (3) and the clamping nut (9) rotate in the same direction and rotation angle through the synchronous clamping shell (8), the clamping screw thread and the main screw thread rotate in opposite directions, when the main nut (3) rotates clockwise, the main nut moves forwards, the clamping nut (9) moves backwards, a workpiece is arranged in front of the main nut (3), and therefore no forward space exists, and the clamping nut (9) is prevented from moving backwards in reverse; when the anti-clockwise rotation is carried out, the main nut (3) retreats, the clamping nut (9) advances, the two contact is tighter, and the main nut (3) has no retreating space. Therefore, the main nut (3) and the clamping nut (9) are fixed in place and mutually restricted to realize looseness prevention.

3. A removable double-threaded gripping type locknut as claimed in claim 1, wherein: the combined nut is integrated by the two synchronous clamping shells (8), the two springs (5) and the main nut (3), when the clamping nut (9) and the main nut (3) are not needed to be synchronous, the synchronous clamping shell (8) on the main nut (3) is pushed forwards, the free movement of the clamping nut (9) is realized, and the assembling and disassembling process can be repeatedly used without damaging the threads.

4. A removable double-threaded gripping type locknut as claimed in claim 1, wherein: the destruction of main thread (2) is only concentrated on the back end on bolt (1), because the nut atress is concentrated on three preceding teeth, consequently bolt (1) back end thread damage does not have too big influence to joint strength, and this patent can reach daily lectotype standard according to the bolt that daily use extends a segment backward.

5. A removable double-threaded gripping type locknut as claimed in claim 1, wherein: through the combination of the main nut (3), the clamping nut (9) and the synchronous clamping shell (8), the main nut (3) does not need to consider the pretightening force and the friction force between the main nut (3) and the screw thread of the bolt (1), and on the premise of not considering the clamping pressure between workpieces, if the screw thread is machined smoothly, a user can directly tighten and fix the screw thread by hand, so that the use requirements on tools such as a wrench are greatly reduced, and the error work and the mistake caused by frequent replacement of the wrench are avoided.

6. A removable double-threaded gripping type locknut as claimed in claim 1, further characterized by: in order to lead the clamping nut (9) to be smoothly screwed into the bolt (1), the inner diameter of the clamping nut (9) is larger than the large diameter of the first thread on the bolt (1).

7. A removable double-threaded gripping type locknut as claimed in claim 1, wherein: the thread pitch of the clamping nut (9) is larger than that of the main thread (2).

8. A removable double-threaded gripping type locknut as claimed in claim 1, wherein: chucking nut (9) appearance and synchronous card shell (8) inner circle shape all are the hexagonal limit type, because chucking nut (9) and main nut (3) pitch are different, probably respective hexagonal limit appearance is not aligned when chucking nut (9) and main nut (3) laminating, synchronous card shell (8) can't nested chucking nut (9), need chucking nut (9) to be required to be close to main nut (3) under synchronous card shell (8) can nested prerequisite.

9. A removable double-threaded gripping type locknut as claimed in claim 3, wherein: the welding work of the combined nut is finished when leaving a factory, and a user only has 3 parts when using the combined nut.

10. A removable double-threaded gripping type locknut as claimed in claim 1, wherein: the restriction with main nut (3) is realized through chucking nut (9), the rotation direction and the rotation angle of chucking nut (9) and main nut (3) are the same through synchronous card shell (8), the axial displacement is the same through reaching main nut (3) and chucking nut (9) in the use, thereby realize the mutual restriction, or through directly cutting out a small segment cylinder at the bolt tail section, again process the screw thread that the pitch is different on this section cylinder, realize the double thread chucking.

Technical Field

The invention relates to a detachable double-thread clamping type locknut, which can effectively realize mechanical locknut and is convenient to assemble and disassemble, belongs to the field of fasteners, and particularly relates to a locknut.

Background

With the progress of the times, basic parts such as bolts and nuts are applied more and more widely in the industry, but with the increasingly complex industrial environment, the looseness prevention of threads occupies more and more important position, particularly relates to machines with serious vibration such as high-speed rails and machine tools, the bolts and nuts can never loosen during use, otherwise, the brought consequences are unimaginable, but the looseness prevention of the conventional bolts and nuts inevitably has various problems, such as spring washers, counter nuts and other looseness prevention modes increase the friction force between thread pairs by increasing the axial force between the nuts, but the looseness prevention mode still does not break away from the limitation of single threads, the looseness prevention effect is not obvious when the tightening torque is too small, and the looseness prevention is difficult to disassemble when the tightening torque is too large. The device is inconvenient to disassemble and assemble due to adhesion or bonding of special materials, great trouble can be brought to maintenance when the device fails, and the anti-loosening effect is obviously reduced after partial threaded connection mode is disassembled and assembled. The invention of the prior used or disclosed locknut has the disadvantages of poor locknut reliability, complex structure and complex manufacture, which causes inconvenient operation. Although industrial hadamard nuts overcome the above disadvantages and have a good anti-loosening effect, their wide spread is limited by the high manufacturing difficulty and expensive selling price.

Above shortcoming is overcome to this patent, develops new chucking thread groove with conventional bolt tail section screw thread in a new way creatively, realizes the different pitch of main nut and chucking nut, and rotation through synchronous main nut of synchronous card shell and chucking nut reaches main nut and chucking nut and restricts locking effect each other, has got rid of traditional locknut to the requirement of pretightning force and thread pair friction power, easy dismounting, repeatedly usable always. Meanwhile, the principle is emphasized in the patent, the manufacturing difficulty and the manufacturing precision are not emphasized, and common fastener manufacturers can automatically transform corresponding fastener production equipment according to the principle to carry out batch production.

Disclosure of Invention

The invention aims to provide a check bolt nut which aims at preventing the looseness of threads, can be disassembled without damage and can keep bearing long-time impact vibration.

1. The core technical characteristics of the invention are as follows: the novel clamping thread groove is cut at the tail section thread position of the conventional bolt again, double-thread clamping is realized through the clamping nut under normal assembly without influencing the main nut, the thread pitch and the screwing direction of the main nut are different, the number of turns and the direction of rotation required by the same advancing distance are also different, the main nut and the clamping nut can be rotated in the same direction and are consistent with the rotation angle through the synchronous clamping shell when the main nut and the clamping nut are rotated in place, the main nut and the clamping nut are rotated in the same direction due to the fact that the screwing direction of the clamping nut and the main thread are opposite, the main nut advances clockwise, the clamping nut retreats, the front of the main nut is a workpiece, the advancing space is not provided, the clamping nut is prevented from retreating in reverse mode, the counterclockwise rotation is carried out, the main nut retreats, the clamping nut advances, the two contact is more tight, and the main nut is not provided with the retreating space. Therefore, the main nut and the clamping nut are fixed in place and mutually restricted, and looseness prevention is realized. Meanwhile, a synchronous clamping shell is welded on the main nut, the clamping nut is embedded under the thrust of the spring under the synchronous clamping shell in a daily state, the main nut and the clamping nut are synchronous, when the state needs to be changed, the synchronous clamping shell can be withdrawn from the embedding of the clamping nut only by pushing the synchronous clamping shell forwards, the free rotation of the clamping nut is realized, and the main nut can also rotate freely at the moment. Because the nut atress is mainly concentrated on first 3 teeth, consequently make full use of back half section screw thread is used for installing the chucking nut, has swung under the prerequisite that does not influence intensity and has taken off the high requirement of nut assembly to pretightning force and frictional force between the screw thread, though improve to some extent the processing degree of difficulty, nevertheless require greatly reduced to the user, locking effect is reliable simultaneously, and stability is strong.

The invention adopts the technical scheme that the detachable double-thread clamping type locknut comprises a bolt (1), a main nut (3), a spring (5), a synchronous clamping shell (8), a clamping nut (9) and the like, wherein 4 main nut convex blocks (4) are welded on the upper surface and the lower surface of the main nut (3) compared with a conventional nut, 1 spring (5) and 1 synchronous clamping shell convex block (7) are clamped between 2 main nut convex blocks (4) on the surface of each main nut (3), 2 synchronous clamping shell convex blocks (7) are welded and connected in a synchronous clamping shell welding groove (6), 1 main nut (3) and 2 springs (5) are clamped and matched by 2 synchronous clamping shell convex blocks (7) to form a whole, when the synchronous clamping shell (8) is in a normal state, a small section extends backwards under the thrust of the spring (5) to be embedded and sleeved on the clamping nut (9), synchronous rotation of the main nut (3) and the clamping nut (9) is realized, namely, the main nut and the clamping nut have the same rotation angle and rotation direction. When the nut is disassembled, the synchronous clamping shell (8) is pushed forwards to achieve the purpose that the synchronous clamping shell (8) is separated from the clamping nut (9), and the clamping nut (9) can move freely relative to the main nut (3). Bolt (1) surface is the same with conventional bolt, nevertheless cuts out a new chucking thread groove (11) in first screw thread tail section department, and chucking nut (9) self has a chucking screw thread (10) for with bolt (1) go up chucking thread groove (11) cooperation, because the nut atress mainly concentrates on 3 preceding teeth, consequently can make full use of back half section screw thread be used for installing chucking nut (9), realize locking under the condition that does not influence threaded connection spare intensity.

A new clamping thread groove (11) is cut at the thread position of the tail section of the conventional bolt again, double-thread clamping is realized through the clamping nut (9) under the condition that normal assembly of the main nut (3) is not influenced, the screw pitch and the screw direction of the main nut (3) and the clamping nut (9) are different, the rotating turns and the rotating directions of the main nut (3) and the clamping nut (9) which move forward at the same distance are different, when the main nut (3) and the clamping nut (9) rotate in place, the rotating directions and the rotating angles of the main nut (3) and the clamping nut (9) can be consistent through the synchronous clamping shell (8), as the clamping threads and the main threads rotate in opposite directions, when the main nut (3) rotates clockwise, the main nut (3) moves forward, the clamping nut (9) retreats, as the workpiece is arranged in front of the main nut (3), no forward space exists, the clamping nut (9) is reversely hindered from retreating, and when the main nut (3) rotates counterclockwise, the clamping nut (9) advances, the two contact is tighter, and the main nut (3) has no retreating space. Therefore, the main nut (3) and the clamping nut (9) are fixed in place and mutually restricted to realize looseness prevention.

A new combined nut is integrated through 2 synchronous clamping shells (8), 2 springs (5) and 1 main nut (3), when the clamping nut (9) and the main nut (3) are not needed to be synchronous, the synchronous clamping shell (8) on the main nut (3) can be pushed forwards, the free movement of the clamping nut (9) is achieved, the purpose of convenience in assembly and disassembly is achieved, the assembly and disassembly process is free of damage to threads, and the combined nut can be used repeatedly.

The damage of the main thread (2) on the bolt (1) is only concentrated on the tail section, and the nut is mainly concentrated on the front three teeth due to stress, so that the damage of the tail section thread of the bolt (1) has no great influence on the bonding strength, the thickness between workpieces and the thickness of the nut need to be considered firstly when the bolt and the nut are used daily, and the length of the bolt (1) needs to be selected, and the bolt can be extended backwards by a small section according to the bolt used daily to achieve the standard of daily model selection.

Through the combination of the main nut (3), the clamping nut (9) and the synchronous clamping shell (8), the main nut (3) does not need to consider the pretightening force and the friction force between the main nut (3) and the screw thread of the bolt (1), and on the premise of not considering the clamping pressure between workpieces, if the screw thread is machined smoothly, a user can even directly screw down and fix the screw thread by hand, so that the use requirements on tools such as a wrench are greatly reduced, and the error work and the time caused by frequently replacing the wrench are avoided.

In order to lead the clamping nut (9) to be smoothly screwed into the bolt (1), the inner diameter of the clamping nut (9) is slightly larger than the large diameter of the first thread on the bolt (1).

The thread pitch of the clamping nut (9) is larger than that of the main thread (2), but not too large, and theoretically, if the thread pitch is too large, the clamping nut (9) can move freely in the axial direction of the bolt (1), so that the significance is lost.

Chucking nut (9) appearance and synchronous card shell (8) inner circle shape all are the hexagonal limit type, because chucking nut (9) and main nut (3) pitch are different, probably respective hexagonal limit appearance is not aligned when chucking nut (9) and main nut (3) laminating, synchronous card shell (8) can't nested chucking nut (9), consequently need be close main nut (3) as far as possible under the prerequisite that synchronous card shell (8) can be nested at chucking nut (9).

Will integrate a new combination formula nut through 2 synchronous card shells (8), 2 spring (5) and 1 main nut (3) through combination formula installation and welding, weldment work should leave the factory and just accomplish, and the user only has 3 parts during the use, has more one than conventional bolt and nut, has avoided the manifold equipment part of traditional check bolt, requires greatly reduced to the user.

Compared with the prior art, the invention has the following beneficial effects.

(1) The invention provides a double-thread clamping method for looseness prevention aiming at a conventional looseness prevention method, avoids the high requirements of the traditional looseness prevention method on nut pretightening force and friction force between thread pairs, and has an obvious looseness prevention effect of a main nut under the combination of a clamping nut and the main nut.

(2) The invention integrates a new combined nut by combining the synchronous clamping shell, the 2 springs and the 1 main nut, and the welding assembly is finished when the combined nut leaves the factory, thereby avoiding the diversified part requirements of the traditional anti-loosening mode

(3) The synchronous clamping shell is innovatively provided, so that the clamping nut can be synchronized with or separated from the main nut at any time, and the clamping nut is firmly nested in the synchronous clamping shell under the action of the spring in daily use.

(4) The invention avoids the damage to the surface of the workpiece clamp and the thread pair when the locknut is disassembled or assembled, and can be repeatedly disassembled.

Drawings

FIG. 1 is a half plane view of a detachable double-thread clamping type locknut of the present invention;

FIG. 2 is an overall view of a removable double-threaded clamping type locknut of the present invention;

FIG. 3 is a detail view of a removable double-threaded clamping type locknut main nut of the present invention;

FIG. 4 is a detail view of a removable double thread jam-type locknut of the present invention;

FIG. 5 is a detail view of a removable double-threaded clamping type locknut synchronous clamping shell of the present invention;

FIG. 6 is a detailed view of a clamping thread groove of a detachable double-thread clamping type locknut of the present invention, FIG. 1;

FIG. 7 is a detailed view of a clamping thread groove of a detachable double-thread clamping type locknut of the present invention, FIG. 2;

the numbers in the figures 1 to 5 are uniform, (1) is a bolt, (2) is a main thread, (3) is a main nut, (4) is a main nut lug, (5) is a spring, (6) is a synchronous clamping shell welding groove, (7) is a synchronous clamping shell lug, (8) is a synchronous clamping shell, (9) is a clamping nut, (10) is a clamping thread, and (11) is a clamping thread groove.

Detailed Description

In order to fully understand the advantages of the present invention, the following detailed description of the present invention is provided in conjunction with the accompanying drawings and the specific embodiments, which are only used for explaining the present invention and do not limit the protection scope of the present invention.

Example (b): as shown in figures 1 to 7, the detachable double-thread clamping type locknut is characterized in that a main thread (2) is arranged on a bolt (1), and meanwhile, a clamping thread groove (11) can be arranged and cut at the tail section of the bolt (1) for being matched with a clamping thread (10) on a clamping nut (9), wherein the thread pitch of the clamping thread (10) is larger than that of the main nut (2). The main nut (3) is provided with 4 main nut lugs (4) in total for being matched with the springs (5) and the synchronous clamping shell lugs (7), two synchronous clamping shells (8) can be combined with 1 main nut (2) and 2 springs (5) through welding to form a new nut, the springs (5) push the synchronous clamping shell lugs (7) under normal conditions to enable the synchronous clamping shell lugs (7) to be in contact with the main nut lugs (4), at the moment, the synchronous clamping shells (8) extend backwards for a small section relative to the main nut (2), and the extending part is just used for nesting the clamping nut (10), so that the clamping nut (10) and the main nut (3) are synchronous and only have the same rotating direction and rotating angle. When the synchronous clamping shell (8) is pushed to exit from the synchronous state, the synchronous clamping shell protruding block (7) compresses the spring (5), the back-off and the disengagement of the clamping nut (10) are realized, and the respective free rotation of the clamping nut (10) and the main nut (3) is realized. The damage of the main thread (2) on the bolt (1) is only concentrated on the tail section, and the nut is mainly concentrated on the front three teeth due to stress, so that the damage of the tail section thread of the bolt (1) has no great influence on the bonding strength, the thickness between workpieces and the thickness of the nut need to be considered in daily use of the bolt and the nut, and therefore the length of the bolt needs to be selected.

As shown in figures 1 and 2, a new combined nut is integrated by 2 synchronous clamping shells (8), 2 springs (5) and 1 main nut (3), when the clamping nut (9) and the main nut (3) are not required to be synchronous, the synchronous clamping shell (8) on the main nut (3) can be pushed forwards, the free movement of the clamping nut (9) is realized, the purpose of convenient assembly and disassembly is achieved, the thread is not damaged in the assembly and disassembly process, and the combined nut can be repeatedly used.

Through the combination of the main nut (3), the clamping nut (9) and the synchronous clamping shell (8), the main nut (3) does not need to consider the pretightening force and the friction force between the main nut (3) and the screw thread of the bolt (1), and on the premise of not considering the clamping pressure between workpieces, if the screw thread is machined smoothly, a user can even directly screw down and fix the screw thread by hand, so that the use requirements on tools such as a wrench are greatly reduced, and the error work and the time caused by frequently replacing the wrench are avoided.

As shown in fig. 1, in this example, to facilitate the screwing of the clamping nut (9) into the bolt (1), the inner diameter of the clamping nut (9) should be slightly larger than the major diameter of the first thread on the bolt (1).

As shown in fig. 1 and 2, in the present embodiment, the outer shape of the clamping nut (9) and the inner ring shape of the synchronous clamping shell (8) are both hexagonal edge type, and because the thread pitches of the clamping nut (9) and the main nut (3) are different, when the clamping nut (9) and the main nut (3) are fitted, it is likely that the respective hexagonal edge outer shapes are not aligned, and the synchronous clamping shell (8) cannot nest the clamping nut (9), so that the clamping nut (9) needs to be as close to the main nut (3) as possible on the premise that the synchronous clamping shell (8) can nest.

Will integrate a new combination formula nut through 2 synchronous card shells (8), 2 spring (5) and 1 main nut (3) through combination formula installation and welding, weldment work should leave the factory and just accomplish, and the user only has 3 parts during the use, has more one than conventional bolt and nut, has avoided the manifold equipment part of traditional check bolt, requires greatly reduced to the user.

2. As shown in fig. 6 and 7, in the present embodiment, a new clamping thread groove (11) is cut at the thread of the tail section of the conventional bolt, double-thread clamping is realized by the clamping nut (9) without affecting the normal assembly of the main nut (3), the number of turns and the direction of rotation required for advancing the same distance are different due to the different thread pitches and the different directions of the main nut (3) and the clamping nut (9), when the main nut (3) and the clamping nut (9) rotate to the right position, the rotation directions and the rotation angles of the main nut (3) and the clamping nut (9) are consistent through the synchronous clamping shell (8), when the clamping thread and the main thread are opposite, clockwise rotation is performed, the main nut (3) advances, the clamping nut (9) retreats, due to the workpiece in front of the main nut (3), there is no advancing space, and the reverse retreat of the clamping nut (9) is hindered, when the anti-clockwise rotation is carried out, the main nut (3) retreats, the clamping nut (9) advances, the two contact is tighter, and the main nut (3) has no retreating space. Therefore, the main nut (3) and the clamping nut (9) are fixed in place, and the main nut (3) and the clamping nut (9) are mutually restricted to realize looseness prevention.

The pitch of the clamping nut (9) as shown in fig. 6 and 7 should be larger than the pitch of the main thread (2), but not too large, and theoretically the pitch could move freely in the axial direction of the bolt (1) if the clamping nut (9) is too large, losing meaning.

In this embodiment, need select suitable nut and bolt according to the thickness of work piece in advance when actual conditions uses, only three parts during the use, namely bolt, chucking nut and combination nut, when the installation, earlier with the combination nut revolve to anticipated position, again with the chucking nut revolve on the position of being close to the combination nut, compress the synchronous card shell on the main nut forward through manual, leave the space that the chucking nut gos forward, at this moment revolve the chucking nut again, the chucking nut is the better under the condition that respective hexagonal appearance aligns, the synchronous card shell is released this moment, synchronous card shell will nest the chucking nut under spring thrust, realize the synchronization of chucking nut and synchronous card shell, the installation is accomplished promptly. When needs are dismantled, compress forward the synchronous card shell on the main nut through manual, reserve the space that the chucking nut backs off, unscrew the chucking nut again, unscrew the combination nut again this moment and can accomplish and dismantle.

Compared with the traditional locknut, the detachable double-thread clamping type locknut adopts a brand-new locking method, avoids the high requirements of the old locking method on the nut pretightening force and the friction force between thread pairs, and simultaneously cannot damage the workpiece due to too much pressure generated on the surface of the workpiece. The anti-loosening device has the advantages of good anti-loosening effect, convenience in disassembly, repeated disassembly, higher use value, simple principle, easiness in vigorous popularization and difficulty in generating technical obstacles.

The core idea of the invention is that a new clamping thread groove is developed through the tail section of the conventional bolt, the clamping nut is used for realizing the restriction with the main nut, the synchronous clamping shell is used for realizing the same rotation direction and rotation angle of the clamping nut and the main nut, the effect of mutual restriction is achieved, in actual use, the same displacement of the main nut and the clamping nut can be achieved through other mechanisms, and the effect of mutual restriction is also achieved, or a small section of cylinder with smaller diameter is directly cut at the tail section of the bolt, threads with different thread pitches are processed on the section of cylinder, and the effect of double-thread clamping can be also achieved, and the effects belong to the protection range of the invention.

Although the present invention has been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made without departing from the spirit of the present invention, which falls within the scope of the present invention.