CN216788961U

CN216788961U - Double-nut self-locking check bolt

Info

Publication number: CN216788961U
Application number: CN202123442531.0U
Authority: CN
Inventors: 钟声; 刘春波; 许喆
Original assignee: BAOSTEEL CONSTRUCTION CO LTD
Current assignee: BAOSTEEL CONSTRUCTION CO LTD
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-06-21
Anticipated expiration: 2031-12-31

Abstract

The utility model discloses a double-nut self-locking check bolt which is characterized in that a main fastening nut and a check nut adopt an anti-loosening structure that a spring ball pin and a pin groove are locked, and the main fastening nut is a hexagon nut provided with the spring ball pin; the anti-loose nut is a hexagon nut provided with a pin slot; one end of the pin slot is a one-way notch of a semicircular hole; after the bolt is fastened with equipment or facilities by the main fastening nut, the lock nut is screwed into the bolt until the spring ball pin on the main fastening nut enters the one-way notch of the semicircular hole to lock the bolt, so that the main fastening nut and the lock nut do not rotate or are not connected and loosened after the bolt is fastened. Compared with the prior art, the utility model has the advantages of simple structure, effective prevention of loosening of fastening bolts, low manufacturing cost and good effect of preventing connection loosening, can be widely used for connection of equipment with larger vibration, can judge whether to finish field operation or not by the sound of the auditory ball pin entering the pin slot during construction, and ensures the effectiveness and reliability of the whole bolt connection.

Description

Double-nut self-locking check bolt

Technical Field

The utility model relates to the technical field of bolt connection, in particular to a double-nut self-locking check bolt.

Background

When the bolt and the nut are connected, a situation often exists, namely when the bolt or the nut has a thread which generates thread slipping, the nut is difficult to unscrew from the bolt. At the moment, the nut and the bolt can be connected basically without looseness, and the connection looseness prevention of the nut and the bolt is rarely ensured by destroying the threads in practical operation. In the case of small vibration, a double-nut structure is also generally adopted for fastening, which is also called as anti-loosening of a top nut. After the two opposite-top nuts are screwed, the pressure of interaction always exists between the two opposite-top nuts, any one of the two nuts needs to rotate to overcome the friction force between the screwing threads, and even if the external load changes, the pressure between the opposite-top nuts also exists all the time, 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 to provide a double-nut self-locking anti-loose bolt aiming at the defects of the prior art, which adopts a locking structure which is arranged between two nuts and is locked by a spring ball pin to ensure that the ball pin enters a pin groove after a main fastening nut and an anti-loose nut are screwed. If the locknut is not flexible, then take place to rotate along the screw thread, the locknut outwards removes the process and receives the one-way notch inner spring ball round pin to block, and can't continue to take place to rotate, ensures whole bolted connection's effective reliable.

The purpose of the utility model is realized as follows: a double-nut self-locking anti-loose bolt is characterized in that a main fastening nut and an anti-loose nut adopt an anti-loose structure that a spring ball pin and a pin groove are locked, the bolt is fastened without rotating or connecting loose, and the main fastening nut is a hexagon nut provided with a round hole; a spring ball pin is placed in the round hole; the anti-loose nut is a hexagon nut provided with a pin slot; the pin groove is a chute with gradually changed groove width and groove depth, and one end of the pin groove is a one-way notch of a semicircular hole; after the bolt is fastened with equipment or facilities by the main fastening nut, the check nut is screwed into the bolt until the spring ball pin on the main fastening nut enters the one-way notch of the semicircular hole to lock the bolt, so that the main fastening nut and the check nut do not rotate or are not connected and loosened after the bolt is fastened.

The pin groove is a groove with an inclination along the fastening reverse direction, and when the nut rotates in the fastening direction, the spring ball pin arranged on the main fastening nut can be pressed into the one-way notch of the semicircular hole along the inclined surface of the pin groove, so that the continuous fastening is ensured to meet the construction requirement; when the bolt is loosened reversely, the spring ball pin can lock the two nuts.

Compared with the prior art, the utility model has the advantages of simple structure, effective prevention of the loosening of the fastening bolt, low manufacturing cost and good effect of preventing the loosening of the connection, can be widely used for the connection of equipment with larger vibration, can judge whether to finish the field operation or not by the sound of the auditory ball pin entering the pin slot during the construction, ensures the effective and reliable connection of the whole bolt and effectively prevents the loosening of the fastening bolt.

Drawings

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

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a cross-sectional view taken along line B-B of FIG. 2;

fig. 4 is a cross-sectional view taken along line C-C of fig. 2.

Detailed Description

Referring to fig. 1 to 2, the present invention includes: the bolt comprises a bolt 1, a main fastening nut 2 and a locknut 3, wherein two symmetrically arranged round holes 6 are formed in the end face of the main fastening nut 2; a spring ball pin 4 is placed in the round hole 6; a plurality of pin grooves 7 which are arranged corresponding to the spring ball pins 4 are arranged on the end surface of the locknut 3; the bolt 1 is fastened with equipment or facilities by the main fastening nut 2 and then screwed into the locknut 3, the spring ball pin 4 is pressed into the one-way notch 5 of the semicircular hole along the inclined plane of the pin slot 7, the screwed locknut 3 is blocked by the spring ball pin 4 in the one-way notch 5 and cannot rotate reversely, self-locking of the locknut 3 and the main fastening nut 2 is realized, and the fastened bolt 1 is prevented from rotating or being connected and loosened.

The keyway 7 is for seting up along the reverse of nut fastening, and towards the chute of one-way notch 5, when locknut 3 screwed up, the spring ball round pin 4 on the main fastening nut 2 impresses two nut auto-locks in the one-way notch 5 of semicircle orifice along the inclined plane, and during the antiport, the spring ball round pin 4 then receives blockking of one-way notch 5 for locknut 3 can only one-way screw up, and it is not hard up to ensure that bolt 1 after the fastening does not take place to rotate or connect.

The semi-circular hole of the one-way notch 5 has the same diameter as the spring ball pin 4 or a little larger than the spring ball pin 4.

Referring to fig. 3, the main fastening nut 2 is a hexagonal nut provided with a circular hole 6; the two round holes 6 are symmetrically arranged on the end face of the main fastening nut 2.

Referring to fig. 4, the locknut 3 is a hexagon nut provided with pin grooves 7, six pin grooves 7 which are vertically and correspondingly arranged with the spring ball pins 4 are uniformly arranged on the end surface of the locknut, the pin grooves 7 are oblique grooves with gradually changed groove widths and groove depths, and one end of each pin groove is a one-way notch 5 with a semicircular hole.

The utility model is used as follows: the main fastening nut 2 and the bolt 1 are fastened on equipment or facilities, after the pre-tightening requirement is met, the locknut 3 is screwed into the bolt 1 until the spring ball pin 4 on the main fastening nut 2 enters the pin slot 7 in the locknut 3, and when the locknut 3 rotates in the tightening direction, the spring ball pin 4 can be pressed into the semicircular hole of the one-way notch 5 along the inclined plane of the pin slot 7, so that the continuous fastening is ensured to meet the construction requirement.

When the bolt rotates reversely, the spring ball pin 4 is blocked by the one-way notch 5, so that the locknut 3 can only be screwed in one way, and the fastened bolt 1 is ensured not to rotate or loose in connection.

The utility model has been described in further detail in order to avoid limiting the scope of the utility model, and it is intended that all such equivalent embodiments be included within the scope of the following claims.

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), two symmetrically arranged round holes (6) are arranged on the end surface of the main fastening nut (2), and a spring ball pin (4) is arranged in the round holes; a plurality of pin grooves (7) which vertically correspond to the spring ball pins (4) are arranged on the end surface of the locknut (3); the pin groove (7) is a chute with gradually changed groove width and groove depth, and one end of the pin groove is a one-way notch (5) with a semicircular hole; the bolt (1) is fastened by the main fastening nut (2) and equipment or facilities and then screwed into the check nut (3), the spring ball pin (4) is pressed into the semicircular hole along the inclined plane of the pin groove (7), the tightened check nut (3) is blocked by the spring ball pin (4) in the one-way notch (5) and cannot rotate reversely, the self-locking of the check nut (3) and the main fastening nut (2) is realized, and the fastened bolt (1) is prevented from rotating or is not connected loosely.

2. The double-nut self-locking anti-loose bolt according to claim 1, characterized in that the pin slot (7) is formed along the reverse direction of nut fastening and faces to the chute of the one-way notch (5), when the anti-loose nut (3) is tightened, the spring ball pin (4) on the main fastening nut (2) is pressed into the one-way notch (5) of the semicircular hole along the inclined plane to self-lock the two nuts, and when the anti-loose nut is tightened in the reverse direction, the spring ball pin (4) is blocked by the one-way notch (5), so that the anti-loose nut (3) can be tightened only in one direction, and the bolt (1) after being tightened is ensured not to rotate or be loose in connection.

3. The double-nut self-locking anti-loose bolt according to claim 1, characterized in that the semi-circular hole of the one-way notch (5) has the same diameter as the spring ball pin (4) or slightly larger than the diameter of the spring ball pin (4).