Double-nut anti-loosening fastening structure

Abstract

The utility model discloses a double-nut anti-loosening fastening structure which comprises a first nut and a second nut, the first nut and the second nut both comprise nut bodies, grooves are inwards formed in the upper end face and the lower end face of each nut body, through threaded holes are formed in the middles of the two grooves, and a limiting plate is downwards arranged on the lower end face of the first nut. The upper end face of the second nut is downwards provided with a limiting groove allowing the limiting plate to be inserted therein, an inclined plate is arranged at the bottom of a groove in the upper end of a threaded hole of the second nut, a through fixing groove is further formed between the upper groove and the lower groove of the first nut, and a fixing rod is arranged in the fixing groove. The fixing rod is inserted into a gap between the inclined plate and the vertical groove wall of the groove in the upper end of the second nut. The two sets of nuts are limited to form a whole through the eccentric limiting plate and the eccentric limiting groove, and the stability of the screwing bolt is improved; on the other hand, the inclined plate is additionally arranged on the inner side of the nut and clamped with the bolt, the stability of nut connection is further improved, meanwhile, the inclined plate is limited by the fixing rod, and stability is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of nut fastening, in particular to a double-nut anti-loosening fastening structure. Background Art

[0002] Nuts are one of the common fasteners and are generally used in conjunction with bolts for threaded connection. However, the conventional connection between nuts and bolts is achieved through the threads of the two, and there is a situation of rotational looseness under vibration conditions. In order to increase the anti-loosening performance, the prior art includes methods such as adding gaskets, using adhesives, and using multiple sets of nuts. The existing utility model with application number 202022357757.X discloses a double-proof nut, which increases the stability of the connection between the nut and the bolt by setting two sets of nuts and fixing the two sets of nuts together as a whole. The connection method of the two sets of nuts is achieved through structures such as hexagonal shells, slide grooves, movable grooves, springs, blocks, threaded holes, and protrusions. However, in the above structure, the structure is complex, and at the same time, the limit stability emphasis is also low, and there is room for improvement. Utility Model Content

[0003] The utility model aims to provide a double nut connection structure with simple structure and good anti-loosening effect in view of the deficiencies existing in the above-mentioned background technology.

[0004] In order to achieve the above purpose, the utility model provides a double nut anti-loosening fastening structure, which adopts the following technical solutions:

[0005] A double-nut anti-loosening fastening structure comprises a first nut and a second nut, wherein the first nut and the second nut both comprise a nut body, wherein grooves are provided inwardly on the upper and lower end surfaces of the nut body, and a threaded hole is provided through the middle of the two grooves, wherein a limiting plate is provided downwardly on the lower end surface of the first nut, and a limiting groove for inserting the limiting plate is provided downwardly on the upper end surface of the second nut, and an inclined plate is arranged on the bottom of the groove at the upper end of the threaded hole of the second nut, and the inclined plate is inclined upward and to the side where the threaded hole is located, and a through fixing groove is also provided between the upper and lower grooves of the first nut, and a fixing rod is provided in the fixing groove, and the fixing rod is inserted into the gap between the inclined plate and the vertical groove wall of the groove at the upper end of the second nut.

[0006] A further improvement of the double-nut anti-loosening fastening structure of the utility model is that a fixing thread is arranged on the vertical groove wall of the groove at the upper end of the first nut, and a screw connection piece is connected to the fixing thread, and the screw connection piece abuts against the fixing rod.

[0007] A further improvement of the double-nut anti-loosening fastening structure of the utility model is that a notch for the bolt to pass through is provided in the middle of the screw-connecting member, and an annular elastic pad is provided at the notch.

[0008] A further improvement of the double-nut anti-loosening fastening structure of the utility model is that the limiting plate and the limiting groove are both annular and arranged eccentrically relative to the threaded hole.

[0009] Compared with the prior art, the beneficial effects of the utility model are:

[0010] The utility model uses an eccentric limiting plate and a limiting groove to limit the two groups of nuts to form a whole, thereby improving the stability of the screw-connected bolts; on the other hand, an inclined plate is added to the inner side of the nut to clamp the bolt, further improving the stability of the nut connection. At the same time, the inclined plate is limited by a fixed rod to ensure stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the utility model;

[0012] In the figure: 1 first nut, 2 second nut, 3 groove, 4 limiting plate, 5 limiting groove, 6 threaded hole, 7 inclined plate, 8 fixing groove. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0014] like Figure 1 As shown, a double nut anti-loosening fastening structure includes a first nut 1 and a second nut 2. The first nut and the second nut both include a nut body. The upper and lower end surfaces of the nut body are provided with grooves 3 inwardly. The middle of the two grooves is provided with a threaded hole 6 that penetrates up and down. The lower end surface of the first nut is provided with a limit plate 4 downwardly. The upper end surface of the second nut is provided with a limit groove 5 for inserting the limit plate downwardly. Preferably, the limit plate and the limit groove are both annular and eccentrically arranged relative to the threaded hole. An inclined plate 7 is arranged on the bottom of the groove at the upper end of the threaded hole of the second nut. The inclined plate is inclined upward and inclined to the side where the threaded hole is located. The inclined plate has a certain elasticity to facilitate the passage of the bolt. A through fixing groove 8 is also provided between the upper and lower grooves of the first nut. A fixing rod is provided in the fixing groove. The fixing rod is inserted into the gap between the inclined plate and the vertical groove wall of the groove at the upper end of the second nut. At least four groups of fixing rods, fixing grooves, and inclined plates are arranged evenly.

[0015] Furthermore, a fixing thread is provided on the vertical groove wall of the groove at the upper end of the first nut, and a screw connection piece (not shown in the figure) is connected to the fixing thread, and the screw connection piece abuts against the fixing rod. A notch is provided in the middle of the screw connection piece for the bolt to pass through, and a ring-shaped elastic pad is provided at the notch. While the screw connection piece abuts against the fixing rod to limit the position, the elastic pad also further limits the position of the bolt, further improving the stability of the nut-bolt connection.

[0016] The working principle of the utility model is as follows: the first nut and the second nut are inserted into each other to form a whole, and the whole is screwed with a bolt. At this time, the inclined plate is against the bolt to achieve further limiting. After the two sets of nuts are in place, the fixing rod is inserted so that the fixing rod is stuck in the gap between the inclined plate and the groove, and then the screw connection is connected. While limiting the fixing rod, the stability of the connection with the bolt is also increased.

[0017] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A double nut anti-loosening fastening structure, characterized in that: The present invention comprises a first nut and a second nut, wherein the first nut and the second nut both comprise a nut body, the upper and lower end surfaces of the nut body are provided with grooves inwardly, a threaded hole is provided through the middle of the two grooves, a limiting plate is provided downwardly provided on the lower end surface of the first nut, a limiting groove for inserting the limiting plate is provided downwardly provided on the upper end surface of the second nut, an inclined plate is arranged on the bottom of the groove at the upper end of the threaded hole of the second nut, the inclined plate is inclined upward and to the side where the threaded hole is located, a fixing groove is also provided through the upper and lower grooves of the first nut, a fixing rod is arranged in the fixing groove, the fixing rod is inserted into the gap between the inclined plate and the vertical groove wall of the groove at the upper end of the second nut, the limiting plate and the limiting groove are both annular and arranged eccentrically with respect to the threaded hole.

2. A double nut anti-loosening fastening structure according to claim 1, characterized in that: A fixing thread is arranged on the vertical groove wall of the groove at the upper end of the first nut, and a screw connection piece is connected to the fixing thread, and the screw connection piece abuts against the fixing rod.

3. A double nut anti-loosening fastening structure according to claim 2, characterized in that: A notch is provided in the middle of the screw connection piece for the bolt to pass through, and an annular elastic pad is provided at the notch.

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