CN207393691U - A kind of derotation self-locking loose-proof thread fastener - Google Patents

Abstract

The utility model is related to a kind of derotation self-locking loose-proof thread fasteners, the derotation self-locking screw thread fastening includes threaded fastener body and derotation self-locking ring, it utilizes the opposite screw thread in anti-loose structure both ends direction of rotation, and combine the taper hole fit structure of one end, by increasing locking frictional force, reducing the pressure to basal body structure, reduction anti-loose structure rotary inertia, the locking of threaded fastener is realized.The threaded fastener of the utility model possess can repeated disassembled and assembled, be installed in place after directly use, inelastic component, long storage period the characteristics of, efficiently solve the problems, such as metal and low-density, brittle non-metal countersunk head or immerse oneself in the locking of helicitic texture.

Description

Anti-rotation self-locking anti-loosening threaded fastener

technical field

The utility model relates to an anti-rotation self-locking anti-loosening threaded fastener, which belongs to the field of threaded fasteners.

Background technique

The limitations of the use environment and conditions put forward higher requirements for the flatness of the structural surface. When using threaded fasteners, the nail head of the fastener is not allowed to protrude from the structural surface. At the same time, combined with the requirements of load and operability, often The connection form shown in Figure 1 appears. For this form of anti-loosening treatment of threaded fasteners, the traditional methods generally use spring washers, self-locking nuts, thread glue, and MJ self-locking threads for anti-loosening. Among them, when the spring washer is used alone, the anti-loosening effect is poor. Self-locking nuts have a limit on the number of times they can be used and affect the application of tightening torque for threaded fasteners. Thread glue is inconvenient to apply to parts that need to be disassembled repeatedly, and a certain glue drying cycle is required after glue application, which affects the use of the product. MJ self-locking thread must be used with response bolts, and the number of uses is limited. For other anti-loosening measures, such as playing insurance, thread punching points, stop washers, etc., all cannot be implemented because the nail head sinks in the matrix structure.

In addition, with the extensive use of composite materials, due to the special characteristics of the material itself, such as anisotropy, low density, and brittleness, a large number of traditional metal structure anti-loosening methods can no longer be used, especially when solving composite materials as shown in Figure 2. When there are problems such as rapid sealing of surface openings, it is generally only possible to rely on glue to prevent loosening, which seriously restricts the use and maintainability of the structure.

To sum up, the existing thread anti-loosening methods have certain limitations, especially not suitable for anti-loosening of countersunk or countersunk thread structures, and are likely to have a negative impact on the overall use and maintainability.

Contents of the invention

(1) Technical problems to be solved

Aiming at the above-mentioned deficiencies in the prior art, the utility model relates to a reverse-rotating self-locking threaded fastener and its use method, which utilizes the anti-loosening structure with threads opposite to the rotation direction at both ends, and combines the tapered hole matching structure at one end, through Increase the anti-loosening friction, reduce the pressure on the base structure, reduce the moment of inertia of the anti-loosening structure, and realize the anti-loosening of threaded fasteners. The threaded fastener of the utility model has the characteristics of repeated disassembly and assembly, direct use after being installed in place, no elastic elements, and long storage period, which effectively solves the problem of loosening of metal and low-density, brittle non-metallic countersunk head or countersunk thread structures. question.

(2) Technical solution

An anti-rotation self-locking and anti-loosening threaded fastener of the utility model comprises a threaded fastener body and an anti-rotation self-locking ring, one end of the threaded fastener body has a body thread, and the other end has a head. The head has a first inner angle structure that facilitates its screwing or loosening. The head is fixedly connected with a boss toward the threaded side of the body. The diameter of the boss is larger than that of the head and around it. has a boss thread; the anti-rotation self-locking ring has an inverted tapered outer wall that is inverted from top to bottom, and the upper section of the inner ring of the anti-rotation self-locking ring has a second ring that facilitates its tightening or loosening. Inner angle structure, the lower part of the inner ring of the anti-rotation self-locking ring has a reverse-rotation self-locking ring thread; the boss thread is adapted to the anti-rotation self-locking ring thread to form a threaded connection, and the direction of rotation of the body thread The thread of the boss and the thread of the anti-rotation self-locking ring are opposite in direction; the reverse tapered outer wall has a higher surface roughness than other surfaces of the threaded fastener.

(3) Beneficial effects

The beneficial technical effect of the utility model is:

1. The utility model is suitable for countersunk or countersunk threaded fasteners with anti-loosening requirements, and can be widely used for anti-loosening threaded fasteners with surface smoothness requirements;

2. The utility model is suitable for express sealing and thread loosening of non-metallic structure openings with material properties such as low density, brittleness, and low compressive strength;

3. In the process of repeated disassembly, the utility model will not cause local damage to the thread of the base body, produce redundant objects and other adverse effects, and the anti-loosening effect is not limited by the number of times of use;

4. The utility model has the ability of repeated disassembly, and the assembly and disassembly process is simple and easy to operate, and has the potential for rapid operation;

5. The utility model does not use any elastic elements and denatured elements, so the storage period is long.

Description of drawings

Fig. 1 Two connection forms of threaded connectors in the prior art.

Fig. 2 is a schematic diagram of a structure for rapid plugging of pores on the surface of a composite material in the prior art.

Fig. 3 is a perspective view of the anti-rotation self-locking anti-loosening threaded fastener of the utility model.

Fig. 4 The usage method of the anti-rotation self-locking anti-loosening threaded fastener of the utility model.

In the figure: 1-first base structure, 2-second base structure, 3-spring washer, 4-threaded fastener, 5, composite material, 6-thread anti-loose glue coating part, 7-plug, 8-thread Fastener body, 9-anti-rotation self-locking ring, 10-inner thread of anti-rotation self-locking ring, 11-inverted tapered outer wall, 12-boss thread, 13-body thread, 14-inverted tapered counterbore, 15 - first through hole, 16 - second through hole.

Detailed ways

Referring to FIG. 3 , a reverse-rotation self-locking anti-loosening threaded fastener of the present invention includes a threaded fastener body 8 and a reverse-rotation self-locking ring 9 , and one end of the threaded fastener body 8 has a body thread 13 , The other end has a head, and the head has a first inner angle structure that facilitates its tightening or loosening. The head is fixedly connected with a boss toward the side of the body thread 13, and the diameter of the boss is larger than the diameter of the boss. the diameter of the head and has a boss thread 12 in its circumferential direction; the anti-rotation self-locking ring 9 has an inverted tapered outer wall 11 that is inverted from top to bottom The upper section of the ring has a second inner angle structure that facilitates its tightening or loosening, and the lower section of the inner ring of the anti-rotation self-locking ring 9 has an anti-rotation self-locking ring thread 10; the boss thread 12 is connected with the anti-rotation self-locking The ring thread 10 is adapted to form a threaded connection, and the direction of rotation of the body thread 13 is opposite to that of the boss thread 12 and the counter-rotating self-locking ring thread 10; Other surfaces of the threaded fasteners described above have a higher surface roughness.

Referring to Figure 4, the method of using the anti-rotation self-locking anti-loosening threaded fastener of the present invention includes installation steps and disassembly steps:

The installation steps include:

1. The installation of the threaded fastener body 8 .

On the upper surface of the first base structure 1, an inverted conical counterbore 14 is processed, and a first through hole 15 is processed below the inverted conical counterbore 14, and the first through hole 15 is a light hole. In the second base structure 2 The second through hole 16 is processed on the top, and the second through hole 16 is a threaded hole or a light hole plus a partial threaded hole. The inverted tapered counterbore 14, the first through hole 15, the second through hole 16 Pass through the first base structure 1 and the second base structure 2 from top to bottom and set them concentrically; insert the threaded fastener body 8 into the inverted tapered counterbore 14 and fix it with a tool adapted to the first inner angle structure Screw into the first through hole 15 and the second through hole 16 in sequence and tighten them. At this time, the first base structure 1 and the second base structure 2 are threadedly connected through the threaded fastener body 8 .

Wherein, the first base structure 1 is a composite material, a metal, or a low-density brittle non-metal.

2. The installation of anti-rotation self-locking ring 9.

The threaded fastener body 8 is limited so that it does not rotate with a tool adapted to the first inner angle structure, and the anti-rotation self-locking ring 9 is reversely screwed into the inverted tapered sink with a tool adapted to the second inner angle structure. In the hole 14, the anti-rotation self-locking ring internal thread 10 and the boss thread 12 are tightened, and the two tools are removed to complete the installation of the anti-rotation self-locking ring 9.

The operation sequence of the disassembly step is reverse to that of the installation step.

After being installed in place, the anti-rotation self-locking ring 9 uses the taper and high surface roughness to maintain a large friction force between it and the first base structure 1. At the same time, due to its small size and light weight, the friction force in the outer ring It is also difficult to rotate when it is large. At the same time, the upper and lower ends of the threaded fastener body 8 are respectively installed in the anti-rotation self-locking ring 9 and the first base structure 1 and the second base structure 2 through threads in opposite directions. The rotation tendency of the side will be restrained by the thread at one end, as long as the anti-rotation self-locking ring 9 is not loose, the threaded fastener body 8 will not be loose. At the same time, since the anti-twist self-locking ring 9 is not on the load-bearing path of the threaded fastener body 8, it can be machined using lightweight materials. In addition, the anti-rotation self-locking ring 9 itself is small in size, and its moment of inertia is small, so it is difficult to loosen. Finally, the anti-loosening of threaded fasteners is realized.

Claims (1)

1. An anti-rotation self-locking anti-loosening threaded fastener is characterized in that it comprises a threaded fastener body and an anti-rotation self-locking ring, one end of the threaded fastener body has a body thread, and the other end has a head, The head has a first inner angle structure that facilitates its screwing or loosening, and the head is fixedly connected with a boss toward the threaded side of the body, the diameter of the boss is larger than the diameter of the head and Its circumference has boss threads; the anti-rotation self-locking ring has an inverted tapered outer wall from top to bottom, and the upper part of the inner ring of the anti-rotation self-locking ring has a The second inner angle structure, the lower part of the inner ring of the anti-rotation self-locking ring has a reverse-rotation self-locking ring thread; the boss thread is adapted to the anti-rotation self-locking ring thread to form a threaded connection, and the body thread The direction of rotation is opposite to that of the thread of the boss and the thread of the anti-rotation self-locking ring; the outer wall of the reverse taper has a higher surface roughness than other surfaces of the threaded fastener.