CN104500522A - Double-nut locking mechanism - Google Patents

Abstract

The present invention discloses a door body installation fastener, and in particular, relates to a double nut locking mechanism. The double nut locking mechanism of the present invention, the nut locking mechanism, comprises a bolt and a first nut and a second nut threadedly connected to the rear end of the bolt, wherein the second nut is arranged between the first nut and the bolt head, and further comprises an outer sleeve and an inner sleeve, the axis center lines of the inner and outer sleeves are consistent, the inner sleeve is fixed to the upper end of the outer sleeve; the upper end of the inner sleeve abuts against the first nut, and the lower end of the inner sleeve abuts against the second nut; and further comprises an annular hoop, the annular hoop comprises an outer ring and a group of protruding teeth arranged on the inner circumference of the outer ring, the protruding teeth all abut against the side surface of the second nut, and the annular hoop is fixed on the inner wall of the outer sleeve. The present invention solves the defect of the nut being easy to loosen in the prior art, and provides a double nut locking mechanism that can enhance the connection stability between the bolt and the nut.

Description

Double Nut Locking Mechanism

technical field

The invention relates to a door body installation fastener, in particular to a double-nut locking mechanism.

Background technique

Bolt connection is a detachable connection made of threaded parts. It has a simple structure and is easy to assemble and disassemble. It is widely used in various mechanical equipment. However, under the action of shock, vibration or variable load, or under the condition of high temperature or large temperature change, the pretightening force and friction force in the bolted connection will gradually decrease or may disappear instantaneously, resulting in failure of the connection. Once the bolt connection fails, it will seriously affect the normal operation of the machine and even cause accidents.

In order to solve the above problems, a bolt structure with double nuts is provided in the prior art, that is, another nut is installed under the original nut to prevent the original nut from moving down. Although this can reduce the probability of nut loosening (the probability that two nuts close together are affected by external mechanical disturbances to loosen synchronously is lower than the probability of a single nut loosening), but long-term use will still cause nut loosening.

Contents of the invention

The technical problem to be solved by the present invention is to provide a double-nut locking mechanism capable of enhancing the stability of the connection between the bolt and the nut.

In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:

A double-nut locking mechanism, comprising a bolt and a first nut and a second nut threadedly connected to the tail end of the bolt, wherein the second nut is arranged between the first nut and the head of the bolt, and also includes an outer sleeve and an inner sleeve Sleeve, the axis lines of the inner and outer sleeves are consistent, the inner sleeve is fixedly connected to the upper end of the outer sleeve; the upper end of the inner sleeve is offset against the first nut, and the lower end of the inner sleeve is offset against the second nut It also includes an annular hoop, the annular hoop includes an outer ring and a group of protruding teeth arranged on the inner peripheral side of the outer ring, and the protruding teeth are all against the side of the second nut, and the annular hoop is fixed on the outer sleeve on the inner wall.

Adopting the double nut locking mechanism of the present invention has the following technical effects:

The inner sleeve is sandwiched between the first and second nuts, and since the inner sleeve is fixedly connected to the upper end of the outer sleeve, the inner sleeve can also be positioned. Since the annular hoop is fixed on the inner wall of the outer sleeve, the annular hoop includes a set of protruding teeth against the side of the second nut, and the outer peripheral side of the second nut is all protruding teeth against the second nut, so that the The second nut is limited in the protruding teeth. If the second nut is to rotate, it will cause the ring hoop, the outer sleeve, and the inner sleeve to rotate synchronously, and the second nut will move upward while rotating, and the inner sleeve is located between the first nut and the second nut Therefore, when the second nut moves up, it will offset the first nut through the inner sleeve. The double-nut locking mechanism of the present invention prolongs the connection between the first nut and the second nut, so that the second nut cannot directly act on the The first nut, thereby enhancing the stability of the nut and avoiding premature loosening of the nut.

Further, the outer sleeve is provided with an annular groove, and the outer ring is embedded in the annular groove.

The way of inserting the slot can conveniently realize the detachable fixed connection between the outer ring and the annular groove.

Further, the protruding teeth include at least one positioning protruding tooth, and the length of the positioning protruding tooth extending to the inner side of the ring hoop exceeds the distance between the ring hoop and the second nut by 0.5-0.8 cm.

The positioning protruding teeth are relatively long, and when installed in this way, the protruding teeth will be deformed when they contact the side of the second nut, and the positioning protruding teeth will tilt upwards or downwards, and the deformation of the protruding teeth will produce a shock on the second nut. Stronger force (mainly directed towards the axis of the second nut axis).

Further, the lower end of the outer sleeve is provided with an open groove leading into the annular groove, and the protruding teeth include connecting protruding teeth extending to the outside of the annular hoop into the open groove.

In order to facilitate the insertion of the ring hoop into the ring groove of the outer sleeve, the connecting protruding teeth are inserted into the opening groove, positioned first, and then the ring hoop is squeezed into the outer sleeve from the lower port of the outer sleeve, and then the outer sleeve is inserted The ring fits into the annular groove. The connecting protruding teeth extend to the outside of the ring hoop and into the open groove, which also increases the synchronicity of the rotation of the ring hoop and the outer sleeve.

Description of drawings

Fig. 1 is a structural schematic diagram of a double-nut locking mechanism of the present invention.

Fig. 2 is a schematic cross-sectional view of A-A in Fig. 1 .

Bolt 1, bolt head 2, first nut 4, second nut 3, outer sleeve 5, inner sleeve 6, positioning protruding tooth 7, connecting protruding tooth 8, dividing line 9, plate 10.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the technical solution of the present invention is further described:

The double-nut locking mechanism of the present invention includes a bolt 1 and a first nut 4 and a second nut 3 threadedly connected to the tail end of the bolt 1, wherein the second nut 3 is arranged between the first nut 4 and the bolt head 2, and the second nut 3 Between the two nuts 3 and the bolt head 2 is a plate 10 that needs to be clamped and fixed.

The double-nut locking mechanism of the present invention also includes an outer sleeve 5 and an inner sleeve 6, the axes of the inner and outer sleeves 5 are consistent, and the inner sleeve 6 is fixedly connected to the upper end of the outer sleeve 5; The upper end of the inner sleeve 6 abuts against the first nut 4 , and the lower end of the inner sleeve 6 abuts against the second nut 3 .

The middle part of the inner sleeve 6 has a hole, the size of the hole is at least enough for the shaft of the bolt 1 to pass through, and the surface wall of the inner sleeve 6 is smooth. For design requirements, it is not necessary to set threads on the surface wall of the inner sleeve 6 .

The double-nut locking mechanism of the present invention also includes an annular hoop. The annular hoop includes an outer ring and a set of protruding teeth arranged on the inner peripheral side of the outer ring. It is fixed on the inner wall of the outer sleeve 5 . The overall material of the ring hoop is made of beryllium bronze. Beryllium bronze has the best elasticity. After solution treatment and heat treatment, the tensile strength can reach 1250-1500MPa. Both the stability of elasticity and dimensional stability are better than spring steel.

The outer sleeve 5 is provided with an annular groove, and the outer ring is embedded in the annular groove.

As shown in FIG. 2 , there are five positioning protruding teeth 7 in the protruding teeth, and the length of the positioning protruding teeth 7 extending to the inner side of the ring hoop exceeds the distance between the ring hoop and the second nut 3 by 0.7 cm. The lower end of the outer sleeve 5 is provided with an open groove leading into the annular groove, and there is also a connecting protruding tooth 8 in the protruding teeth, and the connecting protruding tooth 8 extends into the open groove to the outside of the ring hoop.

For the convenience of installation, the annular hoop is divided into two according to the dividing line 9, and a part of the annular hoop is firstly put into the outer sleeve 5, and then the remaining part is installed. Because the ring hoop is to be positioned by being embedded in the annular groove, the outer diameter of the ring hoop will be larger than the inner diameter of the lower end of the outer sleeve 5. The ring hoop is divided for the convenience of installation, and the certain metal elasticity of the ring hoop itself is utilized. Fit the ring hoop into the ring groove.

What has been described above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, some modifications and improvements can be made, and these should also be regarded as the present invention. The scope of protection, these will not affect the effect of the implementation of the present invention and the practicability of the patent.

Claims (4)

1. A double-nut locking mechanism, comprising a bolt and a first nut and a second nut that are threadedly connected to the tail end of the bolt, wherein the second nut is arranged between the first nut and the head of the bolt, and is characterized in that: it also includes An outer sleeve and an inner sleeve, the axis lines of the inner and outer sleeves are consistent, and the inner sleeve is fixedly connected to the upper end of the outer sleeve; the upper end of the inner sleeve is offset against the first nut, and the inner sleeve The lower end abuts against the second nut; it also includes an annular hoop, the annular hoop includes an outer ring and a set of protruding teeth arranged on the inner peripheral side of the outer ring, and the protruding teeth all abut against the side of the second nut, and the annular hoop is fastened It is arranged on the inner wall of the outer sleeve. 2. The double-nut locking mechanism according to claim 1, wherein an annular groove is provided on the outer sleeve, and the outer ring is embedded in the annular groove. 3. The double-nut locking mechanism according to claim 2, characterized in that: said protruding teeth include at least one positioning protruding tooth, and the length of the positioning protruding tooth extending to the inner side of the hoop exceeds the distance between the hoop and the second nut. The distance value is 0.5~0.8cm. 4. The double-nut locking mechanism according to claim 3, characterized in that: the lower end of the outer sleeve is provided with an opening groove leading into the annular groove, and the protruding teeth include an opening extending to the outside of the ring hoop. Connecting prongs in slots.