CN206144950U - Bolt group with locking function - Google Patents

Abstract

A bolt group with an anti-loosening function, comprising two sections of bolts, pre-tightening nuts, and anti-loosening nuts, the two sections of bolts are provided with two sections of threaded sections with different diameters, and the two sections of threads have opposite directions of rotation; The tightening nut is screwed with the large-diameter threaded section, and the locknut is screwed with the small-diameter threaded section; a groove is provided on the end surface of the pre-tightening nut, and the locknut is connected with the pre-tightening nut. A through hole is provided at a position corresponding to the position of the tight nut groove, and a top wire is screwed at one end of the through hole, a steel ball is provided at the other end of the through hole, and a spring is arranged between the steel ball and the top wire. The utility model acts on the same bolt with nuts of different pitches and directions of rotation, and at the same time arranges steel balls and grooves that cooperate with each other between the two nuts to play a positioning role after the two nuts are tightened. This structure can make the two nuts offset each other's vibration under the action of alternating load, and restrict each other in the direction of trend movement, so as to be self-locking and anti-loosening.

Description

A bolt group with anti-loosening function

technical field

The utility model relates to the field of mechanical installation, in particular to a bolt group with an anti-loosening function.

Background technique

Bolt is a common part of multi-piece connection and plays a vital role in mechanical connection. However, in the environment of alternating loads, the bolted connection is very easy to loosen, thus losing the connection function, causing the connection to fail and easily causing safety accidents.

Utility model content

The purpose of the utility model is to provide a bolt group with anti-loosening function, which is a bolt assembly with self-locking function and independent anti-loosening function. Compared with common bolts, it is safer and more reliable, and has better anti-loosening effect.

In order to achieve the above object, the utility model adopts the following technical solutions:

A bolt group with an anti-loosening function, comprising two sections of bolts, pre-tightening nuts, and anti-loosening nuts, the two sections of bolts are provided with two sections of threaded sections with different diameters, and the two sections of threads have opposite directions of rotation; The tightening nut is screwed with the large-diameter threaded section, and the locknut is screwed with the small-diameter threaded section; a groove is provided on the end surface of the pre-tightening nut, and the locknut is connected with the pre-tightening nut. A through hole is provided at a position corresponding to the position of the tight nut groove, and a top wire is screwed at one end of the through hole, a steel ball is provided at the other end of the through hole, and a spring is arranged between the steel ball and the top wire.

The thread of the large-diameter thread segment is a coarse thread.

The thread of the small-diameter thread segment is a fine pitch thread.

The grooves on the pre-tightening nut are evenly distributed in the circumferential direction.

Compared with the prior art, the beneficial effects of the utility model are:

1) In this utility model, nuts with different pitches and directions of rotation act on the same bolt, and at the same time, steel balls and grooves that cooperate with each other are arranged between the two nuts, which play a role in positioning after the two nuts are tightened. This structure can make the two nuts offset each other's vibration under the action of alternating load, and restrict each other in the direction of trend movement, so as to be self-locking and anti-loosening.

2) The large-diameter thread section is a coarse-thread thread that increases the pre-tightening strength, and the small-diameter thread section is a fine-pitch thread that has a self-locking function and plays two functions of preventing loosening and pre-tightening.

Description of drawings

Fig. 1 is a structural representation of a bolt group with anti-loosening function of the utility model;

Fig. 2 is the A direction view of Fig. 1;

Fig. 3 is an enlarged view of point B in Fig. 1 .

In the figure: 1-two-section bolt, 2-pre-tightening nut, 3-large diameter thread section, 4-small diameter thread section, 5-top wire, 6-lock nut, 7-spring, 8-steel ball, 9- Groove, 10-workpiece 1, 11-workpiece 2.

detailed description

Below in conjunction with accompanying drawing the embodiment of the present utility model is further described:

As shown in Figures 1-2, a bolt group with anti-loosening function includes two sections of bolts 1, pre-tightening nuts 2, and locknuts 6. The two sections of bolts 1 are provided with two sections of thread sections with different diameters. The direction of rotation of the two threads is opposite; the pre-tightening nut 2 is screwed with the large-diameter threaded segment 3, and the locknut 6 is screwed with the small-diameter threaded segment 4; on the end face of the pre-tightened nut 2 A groove 9 is provided on the top, and a through hole is provided at a position corresponding to the position of the pre-tightening nut groove 9 on the locknut 6. One end of the through hole is screwed with a top screw 5, and the other end of the through hole is screwed. A steel ball 8 is provided at one end, and a spring 7 is provided between the steel ball 8 and the top wire 5 .

As shown in Figure 3, one end of the ball 8 installed in the through hole of the locknut is set as a wedge-shaped mouth, the inner diameter of the through hole of the locknut is slightly larger than the ball 8, and the diameter of the wedge-shaped mouth is slightly smaller than the diameter of the ball 8. After the ball 8 is loaded, the spring 7 Under the pressing action of the steel ball 8, a part is exposed. The groove 9 arranged on the end surface of the pre-tightening nut 2 cooperates with the steel ball 8 . The reset length of the spring 7 should be longer than the length of the through hole for easy removal.

The two-section bolt 1 is designed to have two diameters in order to facilitate the passage of the pre-tightening nut 2 .

The thread of the large-diameter thread segment 3 is a coarse thread.

The thread of the small-diameter thread segment 4 is a fine pitch thread.

The grooves 9 on the preload nut 2 are evenly distributed in the circumferential direction. In order to cooperate with the groove 9 on the pre-tightening nut 2, the position of the through hole on the locknut 6 will be consistent with the position of the groove 9 on the pre-tightening nut (the relevant parameters such as hole distance and quantity are the same).

A method for using a bolt group with an anti-loosening function, the specific method is as follows:

1) Determine the length of the two bolts 1 according to the thickness of the connector;

According to the total thickness L of the two workpieces 10, 11, the length of the large-diameter threaded section 3 is determined so that the exposed workpiece length L is the thickness of the pre _- tightening nut 2.

2) Insert the two-section bolt 1 into the bolt hole of the connector, screw in the pre-tightening nut 2 first, tighten the pre-tightening nut 2, then screw in the locknut 6, and tighten the locknut 6 together;

3) Put the steel ball 8 and the spring 7 into the through hole of the anti-loosening nut 6 in turn, and finally screw the jacking wire 5 into the through hole, and push a part of the steel ball 8 into the pre-tightening nut under the elastic force of the spring 7 2 in groove 9;

4) During the operation of the equipment, the vibration of the equipment will cause the pre-tightening nut 2 to loosen and rotate. Since the pre-tightening nut 2 and the anti-loosening nut 6 are screwed in reverse, the pre-tightening nut 2 Under the cooperating force between the steel ball 8 and the groove 9 between the anti-loosening nut 6, the rotary movement trend of the pre-tightening nut 2 will drive the anti-loosening nut 6 to be tightened in reverse, so that the entire bolt group is self-locking;

5) When the equipment is overhauled, the bolt group can be disassembled: first unscrew the top screw 5, take out the spring 7, and then unscrew the lock nut 6 and the pre-tightening nut 2 in sequence. Jackscrew can adopt countersunk head bolt.

Claims (4)

1. a kind of bolt group with locking functions, it is characterised in that described including two sections of bolts, pre-load nut, stop nuts Two sections of bolts are provided with the thread segment of two sections of different-diameters, two sections of screw threads it is oppositely oriented；The pre-load nut and major diameter spiral shell The cooperation of stricture of vagina section is spirally connected, and the stop nut is spirally connected with small diameter thread section cooperation；It is provided with the end face of described pre-load nut Groove, is provided with through hole, in one end of through hole on described stop nut at the position corresponding with pre-load nut groove location Jackscrew is bolted with, the other end of through hole is provided with steel ball, spring is provided between steel ball and jackscrew.

2. a kind of bolt group with locking functions according to claim 1, it is characterised in that the large-diameter thread section Screw thread be coarse thread.

3. a kind of bolt group with locking functions according to claim 1, it is characterised in that the small diameter thread section Screw thread be fine thread.

4. a kind of bolt group with locking functions according to claim 1, it is characterised in that on the pre-load nut Groove is uniform in a circumferential direction.