Screw taking-out device and using method thereof

Abstract

The invention discloses a screw taking-out device and a using method thereof, and belongs to the technical field of aeronautical manufacturing and maintenance, the screw taking-out device comprises a sleeve, a locking ring, a cylindrical rolling shaft and the like, the cross section of an inner hole of the sleeve is a similar triangle formed by connecting three linear sections and three arc sections at intervals, and the locking ring is provided with three strip-shaped cylindrical rolling grooves; and the cylindrical rolling shaft and the cylindrical rolling groove are combined and then are placed and limited in the inner hole of the sleeve. During use, the screw rod is inserted among the three cylindrical rolling shafts in the locking ring, the outer sides of the cylindrical rolling shafts are adjacent to the arc section of the inner hole in a non-extrusion state, the sleeve is rotated, the cylindrical rolling shafts slide to the linear section of the inner hole under the friction force action of threads of the screw rod, the screw rod is clamped by the cylindrical rolling shafts, and the sleeve is continuously rotated to screw out the screw rod. According to the screw disassembling device, when the screw is disassembled, torque applied to the screw acts on the axis of the screw, the screw is prevented from being broken in the rotating and taking-out process, and the disassembling work efficiency is not affected while the quality of a product fastened by a bolt is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of aviation manufacturing and maintenance, and relates to a screw removal device and a use method thereof. Background Art

[0002] During the maintenance of aircraft, it is often necessary to disassemble fasteners such as bolts. Due to the long-term flight and maintenance of aircraft, some bolts will be rusted. During the disassembly process, the screw head often breaks, which brings difficulties to the subsequent disassembly work. For screws with broken heads, the usual disassembly method is to clamp the end of the screw with pliers and disassemble it by applying torque. However, since the axis of the manually applied torque does not coincide with the central axis of the screw, the screw breaks in the fixed threaded hole, affecting the progress of the disassembly work and increasing the difficulty of the repair work. In addition, in the process of tapping the bolt hole of the broken screw, it is easy to cause the expansion of the aperture or damage to the thread, which can easily affect the disassembly quality of the product. For this reason, it is necessary to make a device that can meet the disassembly of the screw after the bolt breaks, while ensuring the quality of the product fastened by the bolt, without affecting the efficiency of the disassembly work. Summary of the invention

[0003] The present invention provides a screw removal device and a method for using the same, which can apply torque to the screw to act on the screw axis when disassembling the screw, thereby preventing the screw from breaking during the process of rotation and removal, while ensuring the quality of the product fastened by the bolt and not affecting the efficiency of the disassembly work.

[0004] The present invention adopts the following technical solution:

[0005] A screw removal device comprises a sleeve, a locking ring, a cylindrical roller, a gasket and a sealing gasket.

[0006] The outer contour of the sleeve is an integrated structure of a cylinder and a hexagonal prism. A square groove is formed at the center of the end face of the hexagonal prism part for fixing with a square wrench. The cylindrical part is a hollow structure, and the cross-section of its inner hole is a quasi-triangular shape formed by three straight line segments and three circular arc segments connected at intervals. A circular groove with a diameter greater than the maximum outer diameter of the inner hole is formed at the opening of the inner hole. A card groove A and a card groove B are formed at the junction of the inner hole and the circular groove, and the card groove B is adjacent to the circular groove, and the card groove A is adjacent to the inner hole. The card groove A and the card groove B are used to install the gasket and the sealing gasket respectively.

[0007] The locking ring is a hollow cylindrical structure, and three strip-shaped cylindrical rolling grooves are formed at one end of its outer wall, and the three cylindrical rolling grooves are evenly distributed along the circumference for placing cylindrical rollers; the outer diameter of the locking ring is smaller than the minimum inner diameter of the inner hole of the sleeve, the inner diameter of the locking ring is larger than the outer diameter of the screw to be decomposed, and the height of the locking ring is smaller than the length of the inner hole of the sleeve.

[0008] The described cylindrical roller is a cylinder, whose height is not less than the length of the cylindrical rolling groove on the locking ring, and its outer diameter is less than the width of the cylindrical rolling groove. There are 3 cylindrical rollers with the same structural dimensions, which are respectively placed in the three cylindrical rolling grooves, and the cylindrical rollers can move radially in the cylindrical rolling grooves. After the cylindrical rollers and the locking ring are combined, they are placed in the inner hole of the sleeve, and the bottom contacts the connection between the cylindrical part and the hexagonal prism part of the sleeve. The combined height matches the length of the inner hole of the sleeve and can rotate in the inner hole. The three cylindrical rollers cooperate with the inner hole of the sleeve to clamp the screw to be disassembled. The screw is inserted between the three cylindrical rollers. When the three cylindrical rollers are at the arc section of the inner hole, it is in a non-extrusion state, and when the three cylindrical rollers are at the straight section of the inner hole, it is in an extrusion state. At this time, the three cylindrical rollers are extruded on the screw to be disassembled.

[0009] The described gasket is an annular washer, which is installed in the groove A to limit the combination of the cylindrical roller and the locking ring in the sleeve.

[0010] The described sealing washer is a C-shaped washer, which is installed in the groove B to seal the gasket, and further seal the cylindrical roller and the locking ring.

[0011] Further, the ratio of the diameter of the cylindrical roller to the diameter of the circular groove in the sleeve is between 1:4 and 1:3.3.

[0012] Further, the ratio of the diameter of the cylindrical roller to the diameter of the arc corresponding to the arc section of the inner hole of the sleeve is between 2:5 and 9:20.

[0013] A using method of the above screw removal device includes: First, place the cylindrical roller in the cylindrical rolling groove of the locking ring, then pass the combination of the cylindrical roller and the locking ring through the circular groove of the sleeve and put it into the inner hole, then put the gasket into the groove A and the sealing washer into the groove B. Pass the screw to be disassembled through the circular groove and insert it between the three cylindrical rollers in the locking ring. When the cylindrical rollers are in the non-extrusion state, the outer sides are adjacent to the arc section of the inner hole of the sleeve, and the cylindrical rollers surround the screw to be disassembled. Insert the square wrench into the square groove of the hexagonal prism part of the sleeve to fix the screw removal device, and rotate the square wrench in the loosening direction. Under the action of the friction force of the thread of the screw to be disassembled, the rotation of the locking ring and the cylindrical roller relative to the sleeve lags behind, so that the cylindrical rollers slide to the straight section of the inner hole. Since the constraint dimension at the straight section becomes smaller, the cylindrical rollers move closer to the axis of the screw to be disassembled and clamp the screw to be disassembled. Continue to rotate the sleeve, and apply a torque coinciding with the axis of the screw to be disassembled to the screw through the cylindrical rollers, so that the screw rotates. Continuously rotate the square wrench to drive the screw to rotate continuously, and then screw out the screw.

[0014] The beneficial effects of the present invention:

[0015] (1) The present invention adopts a component combination method. The components used are simple to process, have a relatively large tolerance after assembly, and are not easily damaged during use.

[0016] (2) The usage method of the present invention is simple, without the need to rely on other complex auxiliary tools, and can improve the working efficiency of disassembly operations after use. Description of the Drawings

[0017] Figure 1 It is the front view of the sleeve of a screw extraction device.

[0018] Figure 2 It is the bottom view of the sleeve of a screw extraction device.

[0019] Figure 3 It is the axonometric view of the sleeve of a screw extraction device.

[0020] Figure 4 It is Figure 1 the A - A cross - sectional view of

[0021] Figure 5 It is Figure 2 the B - B cross - sectional view of

[0022] Figure 6 It is Figure 2 the C - C cross - sectional view of

[0023] Figure 7 It is the front view of the locking ring.

[0024] Figure 8 It is the left view of the locking ring.

[0025] Figure 9 It is the axonometric view of the locking ring.

[0026] Figure 10 It is the axonometric view of the cylindrical roller.

[0027] Figure 11 It is the axonometric view of the gasket.

[0028] Figure 12 It is the axonometric view of the sealing washer.

[0029] Figure 13 It is the axonometric view of the overall assembly relationship of a screw extraction device.

[0030] Figure 14 It is the schematic diagram of the internal state of a screw extraction device in the non - clamped state.

[0031] Figure 15 It is the schematic diagram of the internal state of a screw extraction device in the clamped state.

[0032] Wherein: 1 - sleeve; 2 - slot B; 3 - slot A; 4 - locking ring; 5 - cylindrical rolling groove; 6 - cylindrical roller; 7 - gasket; 8 - sealing washer; 9 - arc segment; 10 - straight segment. Detailed implementation manner

[0033] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, the following will describe the detailed implementation manner of the present invention according to the technical solutions.

[0034] A screw removing device, the screw removing device includes a sleeve 1, a locking ring 4, a cylindrical roller 6, a gasket 7 and a sealing washer 8.

[0035] The outer contour of the sleeve 1 is an integrated structure of a cylinder and a hexagonal prism butt joint. A square groove is made at the center position of the end face of the hexagonal prism part for fixing with a square wrench. The cylinder part is a hollow structure. The cross-section of its inner hole is a triangular shape formed by three straight segments 10 and three arc segments 9 connected at intervals. A circular groove with a diameter larger than the maximum outer diameter of the inner hole is made at the opening of the inner hole. A slot A 3 and a slot B 2 are made at the connection of the inner hole and the circular groove. And the slot B 2 is adjacent to the circular groove, and the slot A 3 is adjacent to the inner hole. The slot A 3 and the slot B 2 are respectively used for installing the gasket 7 and the sealing washer 8. A through hole is made at the connection of the cylinder part and the hexagonal prism part, as Figures 1 to 6 .

[0036] The locking ring 4 is a hollow cylinder structure. One end of its outer wall is made with three strip-shaped cylindrical rolling grooves 5, and the three cylindrical rolling grooves 5 are evenly distributed along the circumference for placing the cylindrical roller 6; the outer diameter of the locking ring 4 is smaller than the minimum inner diameter of the inner hole of the sleeve 1, the inner diameter of the locking ring 4 is larger than the outer diameter of the screw to be disassembled, and the height of the locking ring 4 is smaller than the length of the inner hole of the sleeve 1, as Figures 7 to 9 .

[0037] As Figure 10 , the cylindrical roller 6 is a cylinder, its height is not less than the length of the cylindrical rolling groove 5 on the locking ring 4, its outer diameter is smaller than the width of the cylindrical rolling groove 5. There are 3 cylindrical rollers 6 with the same structural dimensions, which are respectively placed in the three cylindrical rolling grooves 5, and the cylindrical roller 6 can make radial movement in the cylindrical rolling groove 5. After the cylindrical roller 6 and the locking ring 4 are combined, they are placed in the inner hole of the sleeve 1, and the bottom contacts the connection of the cylinder part and the hexagonal prism part of the sleeve. The combined height of the two is matched with the length of the inner hole of the sleeve 1 and can rotate in the inner hole. The ratio of the diameter of the cylindrical roller 6 to the diameter of the circular groove in the sleeve 1 is 1:3.5, and the ratio of the diameter of the cylindrical roller 6 to the diameter of the arc corresponding to the arc segment 9 of the inner hole of the sleeve is 2:5; the three cylindrical rollers 6 cooperate with the inner hole of the sleeve 1 to clamp the screw to be disassembled. The screw is inserted between the three cylindrical rollers 6. When the three cylindrical rollers 6 are located at the arc segment 9 of the inner hole, it is in a non-extrusion state, as Figure 14, when the three cylindrical rollers 6 are located at the straight section 10 of the inner hole, it is in the extrusion state. At this time, the three cylindrical rollers 6 are extruded on the screw to be disassembled, as Figure 15 .

[0038] The gasket 7 is an annular washer and is installed in the card slot A3 to limit the combination of the cylindrical roller 6 and the locking ring 4 within the sleeve 1, as Figure 11 .

[0039] The sealing washer 8 is a C-shaped washer and is installed in the card slot B 2 to seal the gasket 7, and further seal the cylindrical roller 6 and the locking ring 4, as Figure 12 .

[0040] A method for using the above screw removal device includes: First, place the cylindrical roller 6 in the cylindrical groove 5 of the locking ring 4, then pass the combination of the cylindrical roller 6 and the locking ring 4 through the circular groove of the sleeve 1 into the inner hole, then put the gasket 7 into the card slot A3, and clamp the sealing washer 8 in the card slot B 2, as Figure 13 . Insert the screw to be disassembled through the circular groove into the space between the three cylindrical rollers 6 inside the locking ring 4. When the cylindrical rollers 6 are in the non-extrusion state, the outer sides of the cylindrical rollers 6 are adjacent to the arc section 9 of the inner hole of the sleeve 1, and the cylindrical rollers 6 surround the screw to be disassembled. Insert a square wrench into the square groove of the hexagonal prism part of the sleeve 1 to fix the screw removal device. Rotate the square wrench in the loosening direction. Under the action of the frictional force of the thread of the screw to be disassembled, the rotation of the locking ring 4 and the cylindrical rollers 6 relative to the sleeve 1 lags behind, so that the cylindrical rollers 6 slide to the straight section 10 of the inner hole. Since the constraint dimension at the straight section 10 becomes smaller, the cylindrical rollers 6 move closer to the axis of the screw to be disassembled and clamp the screw to be disassembled. Continue to rotate the sleeve 1, and apply a torque coinciding with the axis of the screw to be disassembled to the screw to be disassembled through the cylindrical rollers 6, causing the screw to rotate. Continuously rotate the square wrench to drive the screw to rotate continuously, and then screw out the screw.

[0041] In summary, the above is only the preferred embodiment of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A screw extraction device, characterized in that, The described screw extraction device includes a sleeve (1), a locking ring (4), and cylindrical rollers (6); The outer contour of the sleeve (1) is an integrated structure formed by docking a cylinder and a hexagonal prism. The cylinder part is a hollow structure, and the cross-section of its inner hole is a quasi-triangle formed by the intermittent connection of three straight line segments (10) and three arc segments (9). A circular groove with a diameter larger than the maximum outer diameter of the inner hole is made at the opening of the inner hole; The locking ring (4) is a hollow cylindrical structure. One end of its outer wall is provided with three strip-shaped cylindrical rolling grooves (5), and the three cylindrical rolling grooves (5) are evenly distributed along the circumference for placing the cylindrical rollers (6); the outer diameter of the locking ring (4) is smaller than the minimum inner diameter of the inner hole of the sleeve (1), the inner diameter of the locking ring (4) is larger than the outer diameter of the screw to be disassembled, and the height of the locking ring (4) is smaller than the length of the inner hole of the sleeve (1); The cylindrical roller (6) is a cylinder. Its height is not less than the length of the cylindrical rolling groove (5) on the locking ring (4), its outer diameter is smaller than the width of the cylindrical rolling groove (5). There are 3 cylindrical rollers (6) with the same structural dimensions, which are respectively placed in the three cylindrical rolling grooves (5), and the cylindrical roller (6) can move radially in the cylindrical rolling groove (5). After the cylindrical roller (6) and the locking ring (4) are combined, they are placed in the inner hole of the sleeve (1), and the bottom contacts the connection part of the cylinder part and the hexagonal prism part of the sleeve (1). The combined height of the two matches the length of the inner hole of the sleeve (1) and can rotate in the inner hole. When the three cylindrical rollers (6) are located at the arc segment (9) of the inner hole, it is in a non-extrusion state, and when the three cylindrical rollers (6) are located at the straight line segment (10) of the inner hole, it is in an extrusion state.

2. The screw extraction device according to claim 1, characterized in that, At the center position of the end face of the hexagonal prism part of the sleeve (1), a square groove is made for fixing with a square wrench.

3. The screw extraction device according to claim 1, characterized in that, At the connection of the inner hole of the sleeve (1) and the circular groove, a clamping groove A (3) and a clamping groove B (2) are made. The clamping groove B (2) is close to the circular groove, and the clamping groove A (3) is close to the inner hole. The clamping groove A (3) and the clamping groove B (2) are respectively used for installing a gasket (7) and a sealing washer (8); the gasket (7) is an annular washer and is installed in the clamping groove A (3) to limit the combined body of the cylindrical roller (6) and the locking ring (4) in the sleeve (1); the sealing washer (8) is a C-shaped washer and is installed in the clamping groove B (2) to seal the gasket (7), and thus seal the cylindrical roller (6) and the locking ring (4).

4. A screw extraction device according to claim 1, characterized in that, The ratio of the diameter of the cylindrical roller (6) to the diameter of the circular groove in the sleeve (1) is between 1:4 and 1:3.

3.

5. A screw extraction device according to claim 1, characterized in that, The ratio of the diameter of the cylindrical roller (6) to the diameter of the arc corresponding to the arc segment (9) of the inner hole of the sleeve (1) is between 2:5 and 9:

20.

6. A method for using the screw extraction device according to any one of claims 1 to 5, characterized in that, The described usage method includes: First, place the cylindrical roller (6) in the cylindrical roller groove (5) of the locking ring (4), and then put the combination of the cylindrical roller (6) and the locking ring (4) into and restrict it in the inner hole; insert the screw to be disassembled between the three cylindrical rollers (6) in the locking ring (4). The outer side of the cylindrical roller (6) is adjacent to the arc section (9) of the inner hole of the sleeve (1) in the non-extruded state. Rotate the sleeve (1) in the loosening direction. Under the frictional force of the threads of the screw to be disassembled, the rotation of the locking ring (4) and the cylindrical roller (6) relative to the sleeve (1) lags, causing the cylindrical roller (6) to slide to the straight section (10) of the inner hole. Since the constraint dimension at the straight section (10) becomes smaller, the cylindrical roller (6) moves closer to and clamps the axis of the screw to be disassembled. Continue to rotate the sleeve (1), and apply a torque coinciding with the axis of the screw to be disassembled to the screw through the cylindrical roller (6), causing the screw to rotate. Continuously rotate the sleeve (1) to unscrew the screw.

Images