Screw taking-out device

Abstract

The utility model discloses a screw taking-out device, which belongs to the technical field of aeronautical manufacturing and maintenance and 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 triangle-like shape formed by connecting three linear sections and three arc sections at intervals, the locking ring is provided with three strip-shaped cylindrical rolling grooves, and the cylindrical rolling shaft is arranged in the cylindrical rolling grooves. And the two are combined and then 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. When the screw rod is disassembled, torque applied to the screw rod acts on the axis of the screw rod, the screw rod is prevented from being broken in the rotating and taking-out process, the quality of a product fastened by a bolt is guaranteed, and meanwhile the disassembling work efficiency is not affected.

Description

Technical Field

[0001] This utility model belongs to the field of aviation manufacturing and maintenance technology, and relates to a screw removal device. Background Technology

[0002] During aircraft maintenance, it is often necessary to disassemble fasteners such as bolts. Due to prolonged flight and maintenance, some bolts may become corroded, frequently resulting in head breakage during disassembly, which complicates the subsequent disassembly process. The common method for disassembling bolts with broken heads is to use pliers to grip the end of the bolt and apply torque to break it off. However, because the axis of the manually applied torque does not coincide with the central axis of the bolt, the bolt may break within the fixed threaded hole, affecting the disassembly progress and increasing the difficulty of repair. Furthermore, tapping the bolt hole of the broken bolt can easily enlarge the hole diameter or damage the threads, significantly impacting the quality of the disassembled product. Therefore, a device is needed to disassemble bolts after breakage, ensuring the quality of the products fastened by the bolt without compromising the efficiency of the disassembly process. Utility Model Content

[0003] This invention provides a screw removal device that applies torque to the screw axis during screw disassembly, preventing the screw from breaking during rotation and removal. This ensures the quality of the products fastened by the bolts without affecting the efficiency of the disassembly process.

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

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

[0006] The sleeve has an outer contour that is an integral structure of a cylinder and a hexagonal prism. A square groove is made at the center of the end face of the hexagonal prism for fixing a square wrench. The cylindrical part is a hollow structure, and its inner hole cross-section is a triangle formed by three straight segments and three circular arc segments 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. Slots A and B are made at the junction of the inner hole and the circular groove. Slot B is adjacent to the circular groove, and slot A is adjacent to the inner hole. Slots A and B are used to install gaskets and sealing washers, respectively.

[0007] The locking ring is a hollow cylindrical structure with three strip-shaped cylindrical grooves on one end of its outer wall. These three cylindrical grooves are evenly distributed along the circumference to hold cylindrical rollers. The outer diameter of the locking ring is smaller than the minimum inner diameter of the sleeve's inner hole, the inner diameter of the locking ring is larger than the outer diameter of the screw to be disassembled, and the height of the locking ring is smaller than the length of the sleeve's inner hole.

[0008] The cylindrical roller is a cylinder with a height not less than the length of the cylindrical groove on the locking ring and an outer diameter less than the width of the cylindrical groove. Three cylindrical rollers of identical structural dimensions are placed in the three cylindrical grooves, allowing radial movement within each groove. The cylindrical rollers, combined with the locking ring, are inserted into the inner hole of the sleeve, with the bottom contacting the connection between the cylindrical and hexagonal prism portions of the sleeve. The combined height matches the length of the sleeve's inner hole and allows rotation within the inner hole. The three cylindrical rollers engage 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 located at the arc segment of the inner hole, they are in a non-compression state; when they are located at the straight segment of the inner hole, they are in a compression state, where the three cylindrical rollers press against the screw to be disassembled.

[0009] The gasket is an annular washer installed in slot A to confine the combination of the cylindrical roller and the locking ring within the sleeve.

[0010] The sealing washer is a C-shaped washer, installed in the slot B, used to seal the gasket, and thus seal the cylindrical roller and the locking ring.

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

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

[0013] In use, first place the cylindrical roller in the cylindrical groove of the locking ring, then insert the combination of the cylindrical roller and the locking ring through the circular groove of the sleeve into the inner hole. Next, place the washer into slot A and secure the sealing washer in slot B. Insert the screw to be disassembled through the circular groove between the three cylindrical rollers inside the locking ring. In the non-compression state, the outer side of the cylindrical roller is adjacent to the arc segment of the inner hole of the sleeve, and the cylindrical roller surrounds the screw to be disassembled. Insert the square wrench into the square groove of the hexagonal prism part of the socket to fix the screw removal device. Rotate the square wrench in the loosening direction. Under the friction of the screw thread, the locking ring and cylindrical roller lag behind the rotation of the socket, causing the cylindrical roller to slide to the straight section of the inner hole. Since the constraint dimension is smaller at the straight section, the cylindrical roller moves closer to the axis of the screw to be disassembled, clamping the screw. Continue to rotate the socket, and the cylindrical roller applies a torque to the screw to be disassembled that coincides with the axis of the screw, causing the screw to rotate. Continuously rotating the square wrench drives the screw to rotate continuously, thus unscrewing the screw.

[0014] The beneficial effects of this utility model are:

[0015] (1) This utility model adopts a parts combination method. The parts are simple to process and have a large tolerance after assembly, and are not easily damaged during use.

[0016] (2) The method of using this utility model is simple and does not require the use of other complex auxiliary tools. After use, it can improve the work efficiency of the decomposition operation. Attached Figure Description

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

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

[0019] Figure 3 This is an isometric view of the sleeve of a screw extraction device.

[0020] Figure 4 for Figure 1 AA sectional view.

[0021] Figure 5 for Figure 2 BB cross-sectional view.

[0022] Figure 6 for Figure 2 CC section view.

[0023] Figure 7 This is the main view of the locking ring.

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

[0025] Figure 9 This is an isometric drawing of the locking ring.

[0026] Figure 10 This is an isometric drawing of a cylindrical roller.

[0027] Figure 11 This is an isometric drawing of the gasket.

[0028] Figure 12 Isometric drawing of a sealing washer.

[0029] Figure 13 This is an isometric drawing of the overall assembly relationship of a screw extraction device.

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

[0031] Figure 15 This is a schematic diagram of the internal state of a screw extraction device under clamping conditions.

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

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the specific embodiments of this utility model will be described in detail below.

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

[0035] The sleeve 1 has an outer contour that is an integral structure of a cylinder and a hexagonal prism. A square groove is formed at the center of the end face of the hexagonal prism for fixing a square wrench. The cylindrical part is hollow, and its inner hole cross-section is a triangular shape formed by three straight segments 10 and three circular arc segments 9 connected at intervals. A circular groove with a diameter larger than the maximum outer diameter of the inner hole is formed at the opening of the inner hole. Slots A3 and B2 are formed at the junction of the inner hole and the circular groove, with slot B2 adjacent to the circular groove and slot A3 adjacent to the inner hole. Slots A3 and B2 are used to install the gasket 7 and the sealing washer 8, respectively. A through hole is formed at the connection between the cylindrical part and the hexagonal prism part. Figures 1 to 6 .

[0036] The locking ring 4 is a hollow cylindrical structure with three strip-shaped cylindrical grooves 5 formed at one end of its outer wall. These three grooves 5 are evenly distributed along the circumference to accommodate the cylindrical rollers 6. The outer diameter of the locking ring 4 is smaller than the minimum inner diameter 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. Figures 7 to 9 .

[0037] like Figure 10 The cylindrical roller 6 is a cylinder with a height not less than the length of the cylindrical groove 5 on the locking ring 4, and an outer diameter smaller than the width of the cylindrical groove 5. Three cylindrical rollers 6 of identical structural dimensions are provided and placed in three cylindrical grooves 5 respectively. The cylindrical roller 6 can move radially within the cylindrical grooves 5. After being combined with the locking ring 4, the cylindrical roller 6 is placed into the inner hole of the sleeve 1, with the bottom contacting the connection between the cylindrical part and the hexagonal prism part of the sleeve. The combined height... The length of the cylindrical roller 6 matches the inner hole of the sleeve 1, and it can rotate within the inner hole. The ratio of the diameter of the cylindrical roller 6 to the diameter of the circular groove inside the sleeve 1 is 1:3.5, and the ratio of the diameter of the cylindrical roller 6 to the diameter of the arc segment 9 corresponding to the inner hole of the sleeve is 2:5. The three cylindrical rollers 6 fit into 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, they are in a non-compression state. Figure 14When the three cylindrical rollers 6 are located in the straight section 10 of the inner hole, they are in a compression state. At this time, the three cylindrical rollers 6 are pressed against the screw to be disassembled, such as... Figure 15 .

[0038] The gasket 7 is an annular washer, installed in the slot A 3, used to confine the assembly of the cylindrical roller 6 and the locking ring 4 within the sleeve 1, as shown. Figure 11 .

[0039] The sealing washer 8 is a C-shaped washer, installed in the slot B2, used to seal the gasket 7, and thus seal the cylindrical roller 6 and the locking ring 4, as shown. Figure 12 .

[0040] In use, first place the cylindrical roller 6 into the cylindrical groove 5 of the locking ring 4, then insert the assembly of the cylindrical roller 6 and the locking ring 4 through the circular groove of the sleeve 1 into the inner hole, then place the gasket 7 into the slot A3, and finally secure the sealing washer 8 into the slot B2. Figure 13 The screw to be disassembled is inserted through the circular groove into the locking ring 4 between the three cylindrical rollers 6. In the non-compression state, the outer side of the cylindrical rollers 6 is adjacent to the arc segment 9 of the inner hole of the sleeve 1, and the cylindrical rollers 6 surround the screw to be disassembled. A square wrench is inserted into the square groove of the hexagonal prism part of the sleeve 1 to fix the screw removal device. The square wrench is rotated in the loosening direction. Under the friction of the screw thread, the locking ring 4 and the cylindrical rollers 6 lag behind the rotation of the sleeve 1, causing the cylindrical rollers 6 to slide to the straight section 10 of the inner hole. Due to the reduced constraint size at the straight section 10, the cylindrical rollers 6 move closer to the axis of the screw to be disassembled, clamping the screw. The sleeve 1 is continued to rotate, applying a torque through the cylindrical rollers 6 that coincides with the axis of the screw to be disassembled, causing the screw to rotate. Continuous rotation of the square wrench drives the screw to rotate continuously, thus unscrewing the screw.

[0041] In summary, the above are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A screw extraction device, characterized in that, The screw removal device includes a sleeve (1), a locking ring (4), and a cylindrical roller (6); The sleeve (1) has an outer contour that is an integral structure of a cylinder and a hexagonal prism. The cylindrical part is a hollow structure. Its inner hole cross-section is a triangle formed by three straight segments (10) and three circular arc segments (9) connected at intervals. A circular groove with a diameter greater 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 with three strip-shaped cylindrical grooves (5) on one end of its outer wall. The three cylindrical grooves (5) are evenly distributed along the circumference and are used to place 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 with a height not less than the length of the cylindrical groove (5) on the locking ring (4) and an outer diameter less than the width of the cylindrical groove (5). There are three cylindrical rollers (6) with the same structural dimensions, which are placed in the three cylindrical grooves (5) respectively. The cylindrical roller (6) can move radially in the cylindrical 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 between the cylindrical part and the hexagonal prism part of the sleeve (1). The height of the two after combination 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 section (9) of the inner hole, they are in a non-compression state. When the three cylindrical rollers (6) are located at the straight section (10) of the inner hole, they are in a compression state.

2. The screw extraction device according to claim 1, characterized in that, The hexagonal prism portion of the sleeve (1) has a square groove at the center of its end face for fixing a square wrench.

3. The screw extraction device according to claim 1, characterized in that, The inner hole of the sleeve (1) is connected to the circular groove, and the grooves are A (3) and B (2). The grooves are adjacent to the circular groove and A (3) is adjacent to the inner hole. The grooves are used to install the gasket (7) and the sealing washer (8), respectively. The gasket (7) is an annular washer installed in the groove A (3) to restrict the combination of the cylindrical roller (6) and the locking ring (4) within the sleeve (1). The sealing washer (8) is a C-shaped washer installed in the groove B (2) to seal the gasket (7) and thus seal the cylindrical roller (6) and the locking ring (4).

4. The 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 inside the sleeve (1) is between 1:4 and 1:3.

3.

5. A screw extraction device according to claim 1, characterized in that, Furthermore, the ratio of the diameter of the cylindrical roller (6) to the diameter of the arc segment (9) corresponding to the inner hole of the sleeve (1) is between 2:5 and 9:20.

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