Movable self-locking nut for composite sandwich structure

Abstract

A traveling self-locking nut for a composite sandwich structure is characterized in that a nut is mounted in a supporting structure from the reverse side, and then the nut mounted in the supporting structure is mounted in a top cover together; due to the fact that knurling treatment is carried out on the supporting mechanism, the anti-rotation effect is achieved after the whole assembly is embedded into a machine body; meanwhile, the tail end of the supporting structure is slotted, so that the effect of preventing the nut from rotating when the bolt is screwed into the nut is ensured; the supporting mechanism is made of austenitic stainless steel, so that the corrosion resistance of the product is improved on the premise of ensuring the use function of the product, and meanwhile, the material cost is also reduced; the nut is of a through hole structure, and the problem that due to inaccurate blind hole tapping positioning, the thread length is too short or the end face deforms is solved through the structure; meanwhile, the moving amount of 0.81 mm is formed between the nut and the supporting structure, so that the problem that the bolt cannot be screwed into the nut due to inaccurate positioning is solved; the top cover is made of aluminum alloy, so that the weight of the whole product is reduced.

Description

Technical Field

[0001] The invention relates to a floating self-locking nut for a composite material sandwich structure and belongs to the field of fastener design. Background Art

[0002] The existing floating self-locking nut is a self-locking nut embedded in a blind hole of a honeycomb structure, such as Figure 1 As shown: The product has the following problems during manufacturing and use: 1. During the manufacturing process, since one end of the product is a blind hole, inaccurate positioning may cause the effective length of the tapped thread to be too short during the internal thread processing, resulting in the inability to screw the bolt to the bottom during assembly. Or the effective thread may be too long, causing deformation of the blind hole end face, resulting in an uneven end face after assembly. At the same time, due to the blind hole tapping, problems such as heat dissipation and chip removal of the tap will reduce the service life of the tap.

[0003] 2. During use, the product is directly embedded into the body and then the bolts are screwed in, which requires high positioning. It is easy for the bolts to fail to be screwed in. At the same time, in order to ensure the locking performance, the product is usually made of alloy steel or high-temperature alloy, which makes the product heavy and is not conducive to the weight reduction design of the aircraft. Summary of the invention

[0004] The problem to be solved by the present invention is that the entire assembly plays an anti-rotation role after being embedded in the machine body, and plays a role in preventing the nut from rotating when the bolt is screwed into the nut. At the same time, the corrosion resistance of the product is improved under the premise of ensuring the use function of the product, and the material cost is also reduced; it can also avoid the short thread length or end face deformation caused by inaccurate positioning of blind hole tapping, and also solve the problems of heat dissipation, chip removal, etc. that cause the life of the tap, and the inability of the bolt to be screwed into the nut due to inaccurate positioning; at the same time, it can also reduce the weight of the entire product. After stretching and forming, it is assembled with the nut and the supporting structure for use. At the same time, it also solves the technical problem of ensuring the flatness of the rear end face after assembly.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: A floating self-locking nut for a composite sandwich structure comprises a supporting structure, a nut and a top cover. The nut is installed into the supporting structure from the reverse side, and then the nut installed into the supporting structure is installed into the top cover together. The support mechanism is knurled; the tail end of the support structure is slotted; the support mechanism is made of austenitic stainless steel; The nut is a through-hole structure; there is a play of 0.81 mm between the nut and the supporting structure; The top cover is made of aluminum alloy.

[0006] The grooves of the support structure are rounded or at right angles.

[0007] The beneficial effects of adopting the above technical solutions are as follows: 1. Since the supporting mechanism of the present invention is knurled, it solves the problem of anti-rotation after the whole component is embedded in the body; at the same time, the end of the supporting structure is grooved, so as to prevent the nut from rotating when the bolt is screwed into the nut; the supporting mechanism is processed with austenitic stainless steel, which improves the corrosion resistance of the product on the premise of ensuring the use function of the product, and also reduces the material cost; 2. The nut of the present invention has a through-hole structure, which avoids problems such as short thread length or end face deformation caused by inaccurate blind hole tapping positioning, and also solves the problem of tap life caused by heat dissipation, chip removal and other problems; at the same time, there is a play of 0.81 mm between the nut and the supporting structure, thus solving the problem that the bolt cannot be screwed into the nut due to inaccurate positioning; 3. The top cover of the present invention is made of aluminum alloy, which reduces the weight of the whole product. It is assembled with the nut and the supporting structure after stretch forming. At the same time, it also ensures the flatness of the end face after assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic structural diagram of an existing floating self-locking nut.

[0009] Figure 2 It is a schematic structural diagram of the floating self-locking nut for the composite material sandwich structure of the present invention.

[0010] In the figure: 1 - supporting structure, 2 - nut, 3 - top cover.

[0011] Figure 3 is Figure 2 A schematic structural diagram of the right-angled groove of the supporting structure in

[0012] Figure 4 is Figure 2 A schematic structural diagram of the rounded groove of the supporting structure in

[0013] Figure 5 is Figure 2 The partial enlarged view at I in

[0014] Figure 6 is Figure 2 A schematic structural diagram of the supporting structure in

[0015] Figure 7 is Figure 2 A schematic structural diagram of the nut in

[0016] Figure 8 is Figure 2 A schematic structural diagram of the top cover in

[0017] Figure 9 This is the structural schematic diagram of the floating self-locking nut for the composite material sandwich structure of the present invention after assembly. Specific embodiments

[0018] To make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0019] A floating self-locking nut for a composite material sandwich structure includes a support structure 1, a nut 2 and a top cover 3. The nut 2 is inserted into the support structure 1 from the reverse side, and then the nut 2 inserted into the support mechanism 1 is inserted into the top cover 3 together. Finally, a conical opening die is used to press and deform the top cover 3. During use, the entire assembly is first embedded in the body and then a bolt is inserted. The support structure 1 is knurled to increase the friction force, which plays a role in preventing the entire assembly from rotating with the body. At the same time, the groove between the nut 2 and the support structure 1 also plays a role in preventing rotation; The support mechanism 1 is knurled, and its main function is to prevent rotation when the entire assembly is embedded in the body; the tail end of the support structure 1 is grooved, and its main function is to prevent the nut from rotating when the bolt is screwed into the nut; the support mechanism 1 is processed from austenitic stainless steel, which improves the corrosion resistance of the product while ensuring the use function of the product, and also reduces the material cost; The nut 2 has a through-hole structure, which avoids problems such as short thread length or end face deformation caused by inaccurate blind hole tapping positioning, and also solves the problem of tap life caused by problems such as heat dissipation and chip removal; there is a floating amount of 0.81 mm between the nut 2 and the support structure 1, which solves the problem that the bolt cannot be screwed into the nut due to inaccurate positioning; The top cover 3 is made of aluminum alloy, which reduces the weight of the entire product. It is assembled and used with the nut and the support structure after stretch forming. It also plays a role in ensuring the flatness of the end face after assembly.

[0020] The groove of the support structure 1 is rounded or right-angled, and the groove is used for injecting glue or exhausting air.

Claims

1. A floating self-locking nut for a composite material sandwich structure, Characterized in that: It includes a support structure (1), a nut (2) and a top cover (3). The nut (2) is inserted into the support structure (1) from the reverse side, and then the nut (2) inserted into the support mechanism (1) is inserted into the top cover (3) together; Knurling treatment is carried out on the support mechanism (1); slotting treatment is carried out at the tail end of the support structure (1); the support mechanism (1) is made of austenitic stainless steel; The nut (2) has a through-hole structure; there is a floating amount of 0.81 mm between the nut (2) and the support structure (1); The top cover (3) is made of aluminum alloy.

2. The floating self-locking nut for a composite material sandwich structure according to claim 1, Characterized in that: The slot of the support structure (1) is rounded or at a right angle.

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