CN213575094U

CN213575094U - Double-nut self-locking check bolt

Info

Publication number: CN213575094U
Application number: CN202021648223.6U
Authority: CN
Inventors: 钟声; 曹兴臻
Original assignee: BAOSTEEL CONSTRUCTION CO LTD
Current assignee: BAOSTEEL CONSTRUCTION CO LTD
Priority date: 2020-08-10
Filing date: 2020-08-10
Publication date: 2021-06-29
Anticipated expiration: 2030-08-10

Abstract

The utility model discloses a double-nut self-locking anti-loose bolt, which is characterized in that the bolt adopts an anti-loose structure locked by a main fastening nut and an anti-loose nut, the main fastening nut is in threaded connection with the anti-loose nut, and the main fastening nut is provided with a spring bayonet lock and an external thread; the anti-loosening nut is provided with an internal thread connected with the bolt and the external thread of the main fastening nut; the check nut is screwed in the bolt, and simultaneously, the external thread of the main fastening nut is screwed in until the spring clamping pin enters the annular notch of the check nut to lock the spring clamping pin, so that the main fastening nut and the check nut do not rotate or are not connected loosely after the bolt is fastened. Compared with the prior art, the utility model have simple structure, it is effectual to prevent becoming flexible, can extensively be used for shaking great equipment connection, ensures whole bolted connection's effective reliable, has effectively prevented fastening bolt's not hard up.

Description

Double-nut self-locking check bolt

Technical Field

The utility model belongs to the technical field of the bolted connection technique and specifically relates to a two nut auto-lock check bolt.

Background

When current bolt and nut are connected, often there is a condition, when bolt or nut have a screw thread to take place the smooth silk, the nut just is difficult to be unscrewed from the bolt, and nut and bolted connection can guarantee basically that the connection does not become flexible this moment, and it is locking to adopt the connection of guaranteeing nut and bolt to destroy the screw thread in the actual operation seldom. Under the condition of small vibration, a double-nut structure is also adopted for fastening, namely, the opposite-top nuts are anti-loose, when the two opposite-top nuts are screwed, the two opposite-top nuts always have interactive pressure, and any one of the two nuts needs to rotate to overcome the friction force between screwing threads. Even if the external load changes, the pressure between the opposite nuts is always kept, so that the anti-loosening effect can be achieved.

The double nuts of the prior art are prevented from loosening, and under the condition of large vibration, the upper nut is usually loosened firstly, and then the lower nut is loosened, so that the connection is finally failed.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the not enough of prior art and a double nut auto-lock check bolt that provides adopts to set for one between two nuts and uses the locking structure that moves of spring bayonet lock female locking, ensures main fastening nut and lock nut after screwing up, and the spring bayonet lock gets into in the ring channel. If locknut is not hard up, takes place rotatoryly along the screw thread, locknut outwards removes the process and receives the interior spring bayonet lock of ring channel and stop, and can't continue to take place rotatoryly, ensures that whole bolted connection's is effective reliable, and simple structure has effectively prevented fastening bolt's not hard up, and the cost of manufacture is low, prevents to connect not hard up effectually.

The purpose of the utility model is realized like this: a double-nut self-locking anti-loose bolt is characterized in that the bolt adopts an anti-loose structure locked by a main fastening nut and an anti-loose nut, the main fastening nut is in threaded connection with the anti-loose nut, and the main fastening nut is a hexagon nut provided with a circular truncated cone; one end of the circular truncated cone is provided with a first annular notch and an external thread; a spring bayonet lock is arranged in the first annular notch; the anti-loose nut is a hexagonal nut provided with a stepped screw hole; the upper screw hole of the stepped screw hole is connected with the bolt screw thread, the lower screw hole of the stepped screw hole is connected with the external thread screw thread of the main fastening nut, and a second annular notch is formed in the stepped screw hole connected with the external thread; after the bolt is fastened with equipment or facilities by the main fastening nut, the check nut is screwed into the bolt, and simultaneously, the external thread of the main fastening nut is screwed until the spring clamping pin on the main fastening nut enters the second annular notch of the check nut to lock the second annular notch, so that the main fastening nut and the check nut do not rotate or are not connected and loosened after the bolt is fastened.

And a conical surface transition is arranged between the second annular notch and the lower screw hole of the stepped screw hole, so that the spring clamping pin of the main fastening nut enters the second annular notch of the locknut along the conical surface, the self-locking of the main fastening nut is realized, and the main fastening nut and the locknut do not rotate or are connected and loosened after the bolt is fastened.

After one end of the spring clamping pin enters the second annular notch of the locknut, the other end of the spring clamping pin is still in the annular notch of the main fastening nut; when the locknut is reversely screwed, the spring clamping pin is pressed into the first annular groove by the conical surface, so that the main fastening nut is unlocked, and the locknut is sequentially screwed out of the main fastening nut and the bolt.

Compared with the prior art, the utility model has the advantages of simple structure, the bolt is prevented connecting not hard up effectually, can extensively be used for shaking great equipment and connecting to listen sound during easily the construction and just can judge whether accomplish the field operation, ensure that whole bolted connection is effective reliable, effectively prevented fastening bolt's not hard up.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a schematic view of a main fastening nut;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;

FIG. 5 is a schematic structural view of a locknut;

fig. 6 is a schematic view of the self-locking state of the present invention.

Detailed Description

Referring to fig. 1-2, the bolt 1 of the present invention adopts an anti-loosening structure locked by a main fastening nut 2 and a lock nut 3, and the main fastening nut 2 and the lock nut 3 are connected by screw threads.

Referring to fig. 3, the main fastening nut 2 is a hexagonal nut provided with a circular truncated cone 6; one end of the circular truncated cone 6 is provided with a first annular notch 5 and an external thread 7.

Referring to fig. 4, a spring latch 4 is provided in the first annular notch 5.

Referring to fig. 5, the locknut 3 is a hexagon nut with a stepped screw hole 8; the upper screw hole of the stepped screw hole 8 is in threaded connection with the bolt 1, the lower screw hole of the stepped screw hole is in threaded connection with the external thread 7 of the main fastening nut 2, and the stepped screw hole 8 connected with the external thread 7 is provided with a second annular notch 9. And a conical surface 10 is arranged between the second annular notch 9 and the lower screw hole of the stepped screw hole 8 for transition.

Referring to fig. 6, after the bolt 1 is fastened by the main fastening nut 2 with equipment or facilities, and the locknut 3 is screwed into the bolt 1, the external thread 7 of the main fastening nut 2 is screwed until the spring bayonet 4 on the main fastening nut 2 enters the second annular notch 9 of the locknut 3 to lock the bolt, so that the main fastening nut 2 and the locknut 3 fastened by the bolt 1 do not rotate or loose connection.

The utility model discloses a use like this: fastening on equipment or facility at main fastening nut 2 and bolt 1, and reach the pretension requirement after, locknut 3 twists bolt 1, twist into the external screw thread 7 of main fastening nut 2 last one end simultaneously, until spring bayonet lock 4 on main fastening nut 2 along conical surface 10 entering second annular notch 9 in locknut 3, realize main fastening nut's auto-lock, spring bayonet lock 4 can make a sound get into locking operating condition simultaneously, make behind the fastening of bolt 1 main fastening nut 2 and locknut 3 not take place to rotate or connect not hard up.

When the locknut 3 is reversely screwed, the spring bayonet 4 is pressed into the first annular groove 5 by the conical surface 10, so that the main fastening nut 2 is unlocked, and the locknut 3 is sequentially screwed out of the main fastening nut 2 and the bolt 1.

The present invention is further described above, but not limited to this patent, and all equivalent implementations of the present invention are intended to be encompassed by the scope of the claims of this patent.

Claims

1. A double-nut self-locking anti-loose bolt is characterized in that a bolt (1) adopts an anti-loose structure locked by a main fastening nut (2) and an anti-loose nut (3), the main fastening nut (2) is in threaded connection with the anti-loose nut (3), and the main fastening nut (2) is a hexagon nut provided with a circular truncated cone (6); one end of the circular truncated cone (6) is provided with a first annular notch (5) and an external thread (7); a spring bayonet lock (4) is arranged in the first annular notch (5); the anti-loose nut (3) is a hexagonal nut provided with a stepped screw hole (8); the upper screw hole of the stepped screw hole (8) is in threaded connection with the bolt (1), the lower screw hole of the stepped screw hole is in threaded connection with the external thread (7) of the main fastening nut (2), and a second annular notch (9) is formed in the stepped screw hole (8) connected with the external thread (7); after the bolt (1) is fastened with equipment or facilities by the main fastening nut (2), the check nut (3) is screwed into the bolt (1) and simultaneously the external thread (7) of the main fastening nut (2) is screwed until the spring clamping pin (4) on the main fastening nut (2) enters the second annular notch (9) of the check nut (3) to lock the spring clamping pin, so that the main fastening nut (2) and the check nut (3) fastened by the bolt (1) are not rotated or connected loosely.

2. The double-nut self-locking anti-loose bolt according to claim 1, characterized in that a conical surface (10) is arranged between the second annular notch (9) and the lower screw hole of the stepped screw hole (8) for transition.