Novel wet installation temporary positioning fastener

Abstract

The utility model relates to a novel temporary positioning fastener for wet installation. The novel temporary positioning fastener comprises a cylindrical pin, a hexagonal nut, a check ring for a hole, a compression spring, an internal thread sleeve, a shell, a chuck, a flat shaft and a limiting cap. The temporary positioning and clamping device is suitable for temporary positioning and clamping of a structure with the aperture ranging from phi 5 mm to phi 30 mm and the thickness range of a superposed interlayer ranging from 1 mm to 100 mm. The method is suitable for the wet installation and use environment with any combination of materials such as 7050-T7451, Ti6Al4V, T700, T900 and GH2132. In the wet installation process, a large part of redundant sealant can intrude into the gap between the chuck and the flat shaft, so that when a temporary fastener is disassembled, the head of the chuck can be freely contracted, it is guaranteed that the fastener is smoothly pulled out of a structural hole, working efficiency is improved, working hours and tool losses are reduced, and therefore production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of fasteners, in particular to a novel wet-installation temporary positioning fastener. Background Art

[0002] At present, when assembling all structural elements of an aircraft fuselage, the joint surfaces between several stacked metal plates and composite material plates, between metal plates or between composite material plates need to be sealed to prevent leakage of liquid and gas and intrusion of foreign objects, ensuring the safety of the aircraft structure. Generally, a sealing adhesive is used to achieve the sealing effect. During the curing period of the sealing adhesive, positioning fasteners are usually used to temporarily position and clamp the sealing structure. After the sealing adhesive is cured and relevant processes are completed, the positioning fasteners are removed. The current positioning fasteners have the following disadvantages:

[0003] The adhesive between the joint surfaces will invade the chuck of the positioning fastener, making it impossible to install and disassemble normally. Seriously, it can cause the chuck to fail to contract and the structure to fail.

[0004] Therefore, there is an urgent need for a temporary positioning fastener suitable for wet installation. Content of the Utility Model

[0005] In order to overcome the deficiencies of the prior art, the present invention provides a temporary positioning fastener suitable for wet installation. It is particularly suitable for use environments with a large amount of adhesive. The principle is as follows: On the structure of the relevant parts of the positioning fastener, corresponding storage spaces are reserved to store the excess sealing adhesive. During the curing period, a large part of it will flow into them. After the sealing adhesive is cured, it will not affect the normal contraction of the head of the chuck, thus ensuring the smooth disassembly of the positioning fastener from the structure.

[0006] To solve the above technical problems, the present invention is realized through the following technical solutions: A novel wet-installation temporary positioning fastener, including a cylindrical pin, a hexagon nut, a hole retaining ring, a compression spring, an internal thread sleeve, a housing, a chuck, a flat shaft and a limit cap. The hexagon nut and the internal thread sleeve are fixedly connected through the cylindrical pin. The flat shaft is assembled in the groove of the chuck and slides in the groove. The chuck equipped with the flat shaft is inserted into the inner part of one side of the housing. The tail of the flat shaft is inserted into the "one" character groove at one end of the housing to limit the rotational freedom of the flat shaft. The limit cap is assembled on the cylindrical surface at one end of the housing and is fixedly connected with the housing by interference fit. The compression spring is located between the housing and the internal thread sleeve, with one end pressing on one side of the shoulder of the internal thread sleeve and the other end pressing on one end of the hole retaining ring in the hole, to ensure the smooth screwing of the internal thread in the internal thread sleeve and the external thread of the chuck.

[0007] Preferably, the outer wall of the flat shaft is provided with a first groove, a second groove and a third groove. The first groove is located on the upper and lower parallel surfaces of the flat shaft. The surface has only semi-circular grooves with a radius of R1.5mm. The semi-circular grooves are parallel to each other. There is a section of original plane between the semi-circular grooves, with a width of 1mm. The axis of the semi-circular groove is parallel to the original upper and lower surfaces, and the axial length is 60mm.

[0008] Preferably, the second groove is located on the side surfaces of the upper and lower parallel surfaces of the flat shaft. The shape is an arc-shaped groove. There are 3 such grooves on the upper and lower sides respectively, with a center distance of 20mm, R12mm. Its axis is perpendicular to the upper and lower surfaces. The arc-shaped grooves are parallel to each other. There is a section of original outer cylindrical surface between the grooves, and the axial length is about 5.5mm.

[0009] Preferably, the third groove is located at the four corner positions of the cylindrical surface and the upper and lower surfaces of the flat shaft, and is an "L"-shaped groove with a size of 2.2mm×2.2mm and an axial length of 58mm.

[0010] Preferably, the outer wall of the chuck is sleeved with a left sandwich plate and a right sandwich plate. The cylindrical pin, hexagonal nut, hole retaining ring, compression spring, internal thread sleeve, housing, chuck, flat shaft and limit cap cooperate to fixedly connect the left sandwich plate and the right sandwich plate.

[0011] The number of such grooves is not limited to 3, and theoretically can be 1...n; and the shape of the groove is not limited to semi-circular grooves, arc-shaped grooves or "L"-shaped grooves. It can also be a rectangular groove or any shape of groove that can store excess sealant.

[0012] Preferably, both the left sandwich plate and the right sandwich plate are composed of a single layer of aluminum alloy and a single layer of T700. The total thickness of the sandwich is 20mm, and the hole diameter is 7.5mm.

[0013] It is applicable to the aperture range of aircraft structures from φ5mm to φ30mm, and the superimposed sandwich thickness range from 1mm to 100mm.

[0014] It is applicable to the use environment of wet installation with any combination of materials such as 7050-T7451, Ti6Al4V, T700, T900, GH2132, etc.

[0015] The beneficial effects of the present utility model are:

[0016] The utility model is applicable to the temporary positioning and clamping of aircraft structures with aperture ranges from φ5mm to φ30mm and superimposed sandwich thickness ranges from 1mm to 100mm. It is applicable to the wet installation environments with any combination of materials such as 7050-T7451, Ti6Al4V, T700, T900, GH2132, etc. During the wet installation process, a large part of the excess sealant will invade the gap between the chuck and the flat shaft, enabling the head of the chuck to freely contract when disassembling the temporary fastener, ensuring the smooth extraction of the fastener from the structural hole, improving work efficiency, reducing man-hours and tool wear, and thus reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the overall exploded structure schematic diagram of the utility model.

[0018] Figure 2 is the overall fully-sectioned structure schematic diagram of the utility model.

[0019] Figure 3 is the schematic diagram of the flat shaft structure of the utility model.

[0020] Figure 4 is the schematic diagram of the second state of the overall fully-sectioned structure of the utility model.

[0021] Figure 5 is the schematic diagram of the side structure of the flat shaft of the utility model.

[0022] Figure 6 is the schematic diagram of the front structure of the flat shaft of the utility model.

[0023] Figure 7 is the schematic diagram of the sectional structure at A-A of the flat shaft of the utility model.

[0024] Figures 1-7 In the figure: 1, cylindrical pin; 2, hexagon nut; 3, hole retaining ring; 4, compression spring; 5, internal thread sleeve; 6, housing; 7, chuck; 8, flat shaft; 81, first groove; 82, second groove; 83, third groove; 9, limit cap; 10, left sandwich plate; 11, right sandwich plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0026] As Figures 1-7 shown, the new wet-installation temporary positioning fastener includes a cylindrical pin 1, a hexagonal nut 2, a hole retaining ring 3, a compression spring 4, an internal thread sleeve 5, a housing 6, a chuck 7, a flat shaft 8, and a limit cap 9. The hexagonal nut 2 and the internal thread sleeve 5 are fixedly connected through the cylindrical pin 1. The flat shaft 8 is assembled in the groove of the chuck 7 and slides in the groove. The chuck equipped with the flat shaft 8 is inserted into the inside of one side of the housing 6. The tail of the flat shaft 8 is inserted into the "one" character groove at one end of the housing 6 to limit the rotational freedom of the flat shaft 8. The limit cap 9 is assembled on the cylindrical surface at one end of the housing 6 and is fixedly connected with the housing 6 by interference fit. The compression spring 4 is located between the housing 6 and the internal thread sleeve 5, with one end pressing on one side of the shoulder of the internal thread sleeve 5 and the other end pressing on one end of the hole retaining ring 3 in the hole, to ensure the smooth screwing of the internal thread in the internal thread sleeve 5 and the external thread of the chuck.

[0027] The outer wall of the flat shaft 8 is provided with a first groove 81, a second groove 82, and a third groove 83. The first groove 81 is located on the upper and lower parallel surfaces of the flat shaft 8, with 14 semi-circular grooves R1.5mm on the surface. The semi-circular grooves are parallel to each other, and there is a section of original plane between the semi-circular grooves, with a width of 1mm. The axis of the semi-circular groove is parallel to the original upper and lower surfaces, and the axial length is 60mm.

[0028] The second groove 82 is located on the side of the upper and lower parallel surfaces of the flat shaft 8, and its shape is an arc-shaped groove. There are 3 places on the upper and lower sides respectively, with a center distance of 20mm, R12mm. Its axis is perpendicular to the upper and lower surfaces. The arc-shaped grooves are parallel to each other, and there is a section of original outer cylindrical surface between the grooves, with an axial length of about 5.5mm.

[0029] The third groove 83 is located at the four corner positions of the cylindrical surface and the upper and lower surfaces of the flat shaft 8, and is in the shape of an "L" groove, with a size of 2.2mm×2.2mm and an axial length of 58mm.

[0030] The outer wall of the chuck 7 is sleeved with a left sandwich plate 10 and a right sandwich plate 11. The cylindrical pin 1, the hexagonal nut 2, the hole retaining ring 3, the compression spring 4, the internal thread sleeve 5, the housing 6, the chuck 7, the flat shaft 8, and the limit cap 9 cooperate to fixedly connect the left sandwich plate 10 and the right sandwich plate 11.

[0031] Both the left sandwich plate 10 and the right sandwich plate 11 are composed of a single layer of aluminum alloy and a single layer of T700, with a total sandwich thickness of 20mm and a hole diameter of 7.5mm.

[0032] Typical usage method of the positioning fastener:

[0033] 1) Before use, the head of the chuck of the positioning fastener is in a contracted state, and the head diameter is smaller than the structure hole diameter;

[0034] 2) Manually insert the head of the positioning fastener chuck into the holes of the two-layer structural plates, and make the limit cap closely adhere to the surface of the sandwich plate;

[0035] 3) Use an internal hexagonal socket wrench to turn the hexagonal nut clockwise. The chuck moves to the left, and the flat shaft expands the head of the chuck until the two-layer structural plates are clamped by the chuck;

[0036] During disassembly, use an internal hexagonal socket wrench to turn the hexagonal nut counterclockwise. The chuck moves to the right, and the head of the chuck begins to contract until the diameter of the chuck is smaller than the hole diameter of the structure. Manually pull out the positioning fastener along the axis direction of the structure hole.

[0037] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A novel wet-installation temporary positioning fastener, comprising a cylindrical pin (1), a hexagonal nut (2), a retaining ring for a hole (3), a compression spring (4), an internally threaded sleeve (5), a housing (6), a chuck (7), a flat shaft (8) and a limiting cap (9), characterized in that: The hexagonal nut (2) is fixedly connected to the internally threaded sleeve (5) via a cylindrical pin (1); the flat shaft (8) is assembled in the groove of the chuck (7) and slides in the groove; the chuck equipped with the flat shaft (8) is inserted into one side of the shell (6); the tail of the flat shaft (8) is inserted into the "I" groove at one end of the shell (6) to limit the rotational freedom of the flat shaft (8); the limit cap (9) is assembled on the cylindrical surface at one end of the shell (6) and is fixedly connected to the shell (6) by an interference fit; the compression spring (4) is located between the shell (6) and the internally threaded sleeve (5), one end of which is pressed on one side of the shaft shoulder of the internally threaded sleeve (5) and the other end of which is pressed on one end of the retaining ring (3) for the hole in the hole to ensure smooth screwing of the internal thread of the internally threaded sleeve (5) and the external thread of the chuck.

2. The novel wet-installation temporary positioning fastener according to claim 1 is characterized in that: The outer wall of the flat shaft (8) is provided with a first groove (81), a second groove (82) and a third groove (83), wherein the first groove (81) is located on the upper and lower parallel surfaces of the flat shaft (8), and the surface is provided with 14 semicircular grooves R1.5 mm, the semicircular grooves are parallel to each other, and an original plane with a width of 1 mm is retained between the semicircular grooves, the axes of the semicircular grooves are parallel to the original upper and lower surfaces, and the axial length is 60 mm.

3. The novel wet-installation temporary positioning fastener according to claim 2 is characterized in that: The second groove (82) is located on the side of the upper and lower parallel surfaces of the flat shaft (8) and is in the shape of an arc-shaped groove, with 3 grooves on the upper and lower sides, a center distance of 20mm, R12mm, and an axis perpendicular to the upper and lower surfaces. The arc-shaped grooves are parallel to each other, and a section of the original outer cylindrical surface is retained between the grooves, with an axial length of about 5.5mm.

4. The novel wet-installation temporary positioning fastener according to claim 2 is characterized in that: The third groove (83) is located at the four corners between the cylindrical surface and the upper and lower surfaces of the flat shaft (8), and is an "L"-shaped groove with a size of 2.2mm×2.2mm and an axial length of 58mm.

5. The novel wet-installation temporary positioning fastener according to claim 1 is characterized in that: The outer wall of the chuck (7) is sleeved with a left sandwich plate (10) and a right sandwich plate (11); the cylindrical pin (1), the hexagonal nut (2), the hole retaining ring (3), the compression spring (4), the internal thread sleeve (5), the shell (6), the chuck (7), the flat shaft (8) and the limiting cap (9) cooperate to fix the left sandwich plate (10) and the right sandwich plate (11) together.

6. The novel wet-installation temporary positioning fastener according to claim 5 is characterized in that: The left sandwich plate (10) and the right sandwich plate (11) are both made of a combination of a single-layer aluminum alloy and a single-layer T700, with a total sandwich thickness of 20 mm and a hole diameter of 7.5 mm.

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