Lockable variable thread lock bolt and nut device

Abstract

A lockable variable thread anti-loosening bolt and nut device includes: a bolt that can be inserted into two connecting plates; a fastening nut fitted onto the bolt; an anti-loosening nut fitted onto the bolt and positioned above the fastening nut; an arc-shaped groove along the length of one side of the outer wall of the bolt, with a limiting groove at the bottom of the arc-shaped groove; a threaded pin, which is a cylindrical trihedron with three arc-shaped sides, inserted into the arc-shaped groove of the bolt, with the first and second arc surfaces located inside the arc-shaped groove, the first arc surface corresponding to the arc surface of the arc-shaped groove of the bolt; the second arc surface being a concave arc surface, with a locking groove at the bottom; and a third arc surface located outside the arc-shaped groove, with external threads on the third arc surface; and a locking pin with a protrusion along the circumferential direction on its lower outer wall, and a cross-shaped groove at the bottom of the locking pin, forming a split structure; the locking pin is inserted into the arc-shaped groove of the bolt, and the protrusion is embedded in the locking groove at the bottom of the second arc surface.

Description

Technical Field

[0001] This utility model relates to the field of bolt connection technology, specifically to a lockable variable thread anti-loosening bolt and nut device. Background Technology

[0002] When bolts and nuts are connected, a double-nut structure is often used for fastening in situations with minimal vibration; this is also known as a counter-nut anti-loosening method. Once the two counter-nuts are tightened, there is always an interactive pressure between them. For either nut to rotate, it must overcome the friction between the engaged threads. Even if the external load changes, if specialized technical measures are used to ensure the upper nut does not loosen, the pressure between the counter-nuts remains constant, thus preventing loosening.

[0003] In existing double-nut anti-loosening technology, under conditions of significant vibration, the anti-loosening nut usually loosens first, followed by the main fastening nut, ultimately leading to connection failure. Summary of the Invention

[0004] The purpose of this invention is to design a lockable variable thread anti-loosening bolt and nut device, which effectively prevents the bolt from loosening, has a good anti-loosening effect, and can be widely used in the connection of equipment with large vibrations.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A lockable variable thread anti-loosening bolt and nut device, comprising,

[0007] Bolts can be inserted into two connecting plates;

[0008] Tighten the nut and fit it onto the bolt;

[0009] The lock nut is fitted onto the bolt and positioned above the fastening nut.

[0010] An arc-shaped groove is provided on one side of the outer wall of the bolt along the length direction. The length of the arc-shaped groove is less than the thickness of the two connecting plates plus the thickness of the fastening nut. A limiting groove is opened at the bottom of the arc-shaped groove.

[0011] The threaded pin is a cylindrical trihedron with three curved sides, which is inserted into the arc-shaped groove of the bolt, wherein...

[0012] The first and second arc surfaces are located inside the arc-shaped groove. The first arc surface corresponds to the arc surface of the arc-shaped groove of the bolt, and the two arc surfaces match. The second arc surface is a concave arc surface, which forms a channel with the inner wall of the arc-shaped groove. A locking groove is provided at the lower part of the second arc surface. The third arc surface is located outside the arc-shaped groove, and the third arc surface has external threads. The pitch of the threads is the same as the pitch of the threads in the arc-shaped groove.

[0013] The locking pin has a circumferential protrusion on its lower outer wall and a cross groove at the bottom, forming a split body structure. The locking pin is inserted into the channel formed by the arc-shaped groove of the bolt and the second arc surface of the threaded pin, and the protrusion is embedded in the locking groove at the bottom of the second arc surface.

[0014] In the lockable variable thread anti-loosening bolt and nut device described in this utility model...

[0015] The threaded pin is a rotatable trihedron with a threaded surface on one side. The thread pitch is the same as the bolt pitch, ensuring the nut can be easily inserted. Simultaneously, if the threaded pin rotates counterclockwise along the thread, it breaks the thread, thus locking the nut. The threaded pin and the locking pin have an arc-shaped bottom groove at their bottom positions, which corresponds to the arc-shaped bottom groove at the bottom of the bolt slot.

[0016] The locking pin has a cross-shaped groove at the bottom, forming a split structure with a retractable function, ensuring that the locking pin can be smoothly inserted into the bolt and threaded pin. After the locking pin is installed, if the threaded pin rotates counterclockwise along the thread, it cannot return to its original shape, thus completely locking the bolt and nut.

[0017] The lockable variable thread anti-loosening bolt and nut device of this utility model is characterized by a rotatable threaded pin, which ensures smooth installation of the nut and locks the bolt and nut by rotating the threaded pin. When locking is not required, another nut can be installed on top, ensuring that the current nut and anti-loosening nut can be easily removed after installation. If locking the bolt and nut is required, a locking pin is simply driven into the designed position. If the threaded pin rotates counterclockwise along the thread, the thread is broken, preventing it from returning to its original state and completely locking the bolt and nut.

[0018] Compared with the prior art, the advantages of this utility model are:

[0019] This utility model adopts the thread position change of the threaded pin and the locking pin to fix the threaded pin, thus achieving an anti-loosening structure for the nut and bolt.

[0020] This utility model has a simple structure, effectively prevents the fastening bolts from loosening, has a good anti-loosening effect, and has low manufacturing cost. It can be widely used for connecting equipment with large vibrations. Attached Figure Description

[0021] Figure 1 This is a front view of an embodiment of the present utility model;

[0022] Figure 2 This is a top view of an embodiment of the present utility model;

[0023] Figure 3 for Figure 2 A magnified view of a portion of the image;

[0024] Figure 4 This is a top view of the bolt in an embodiment of this utility model;

[0025] Figure 5 for Figure 4 AA cross-section view;

[0026] Figure 6 for Figure 5 BB cross-section;

[0027] Figure 7 This is a top view of the threaded pin in an embodiment of this utility model;

[0028] Figure 8 for Figure 7 CC cross-section;

[0029] Figure 9 for Figure 7 DD cross-section;

[0030] Figure 10 This is a top view of the locking pin in an embodiment of this utility model;

[0031] Figure 11 for Figure 10 EE cross-section;

[0032] Figure 12 for Figure 10 FF cross-section. Detailed Implementation

[0033] See Figures 1-12 The lockable variable thread anti-loosening bolt and nut device of this utility model includes,

[0034] Bolt 1 can be inserted into the two connecting plates 100;

[0035] Tighten nut 2 and fit it onto bolt 1;

[0036] The anti-loosening nut 3 is fitted onto the bolt 1 and positioned above the fastening nut 2;

[0037] The outer wall of one side of the bolt 1 is provided with an arc-shaped groove 11 along the length direction. The length of the arc-shaped groove 11 is less than the thickness of the two connecting plates 100 plus the thickness of the fastening nut 2. A limiting groove 12 is opened at the bottom of the arc-shaped groove 11.

[0038] The threaded pin 4 is a cylindrical trihedron with three curved sides, which is inserted into the arc-shaped groove 11 of the bolt 1.

[0039] The first arc surface 41 and the second arc surface 42 are located inside the arc-shaped groove 11. The first arc surface 41 corresponds to the arc surface of the arc-shaped groove 11 of the bolt 1, and the two arc surfaces match. The second arc surface 42 is a concave arc surface, which forms a channel 6 with the inner wall of the arc-shaped groove 11. Furthermore, a locking groove 421 is provided at the lower part of the second arc surface 42. The third arc surface 43 is located outside the arc-shaped groove 11, and the third arc surface 43 has an external thread, the pitch of which is the same as the thread pitch of the arc-shaped groove 11.

[0040] The locking pin 5 has a protrusion 51 on its lower outer wall along the circumference, and a cross groove 52 is opened at the bottom of the locking pin 5 to form a split body structure; the locking pin 5 is inserted into the channel 6 formed by the arc-shaped groove 11 of the bolt 1 and the second arc surface 42 of the threaded pin 4, and the protrusion 51 is embedded in the locking groove 421 at the lower part of the second arc surface 42.

[0041] When in use, tighten the fastening nut and bolt on the equipment or facility, and after the pre-tightening requirement is met, screw the lock nut into the bolt and threaded pin until the lock nut is tightened in place.

[0042] If the bolt and nut do not need to be locked, a temporary nut can be installed on the top of the bolt to ensure that the threaded pin will not rotate when the fastening nut and anti-loosening nut are removed, and there is no need to drive in a locking pin.

[0043] If the bolt and nut need to be locked, drive in the locking pin. The lower protrusion of the locking pin can smoothly enter the threaded pin and embed into the locking groove at the bottom of the second arc surface. The locking pin is fixed and at the same time ensures that the threaded pin can rotate outward along the arc surface, causing the external thread of the threaded pin to misalign with the bolt thread, achieving the effect of thread destruction, so that the anti-loosening nut cannot rotate, thus ensuring that the bolt and nut are locked.

Claims

1. A lockable variable thread anti-loosening bolt and nut device, comprising, Bolts can be inserted into two connecting plates; Tighten the nut and fit it onto the bolt; A lock nut, fitted onto a bolt and positioned above a fastening nut; characterized in that, An arc-shaped groove is provided on one side of the outer wall of the bolt along the length direction. The length of the arc-shaped groove is less than the thickness of the two connecting plates plus the thickness of the fastening nut. A limiting groove is opened at the bottom of the arc-shaped groove. The threaded pin is a cylindrical trihedron with three curved sides, which is inserted into the arc-shaped groove of the bolt, wherein... The first and second arc surfaces are located inside the arc-shaped groove. The first arc surface corresponds to the arc surface of the arc-shaped groove of the bolt, and the two arc surfaces match. The second arc surface is a concave arc surface, which forms a channel with the inner wall of the arc-shaped groove. A locking groove is provided at the lower part of the second arc surface. The third arc surface is located outside the arc-shaped groove, and the third arc surface has external threads. The pitch of the threads is the same as the pitch of the threads in the arc-shaped groove. The locking pin has a circumferential protrusion on its lower outer wall and a cross groove at the bottom, forming a split body structure. The locking pin is inserted into the channel formed by the arc-shaped groove of the bolt and the second arc surface of the threaded pin, and the protrusion is embedded in the locking groove at the bottom of the second arc surface.

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