Auxiliary Device for Repairing Wind Turbine Yaw Brake Disc and Its Usage Method

Abstract

The present invention belongs to the technical field of maintenance of the wind turbine yaw system, and discloses an auxiliary device for repairing the wind turbine yaw brake disc, including a rotating table. A first motor is fixedly connected to the middle of the interior of the rotating table. Both the left and right sides of the first motor are fixedly connected with rotating rods. The other sides of the rotating rods are respectively hinged with movable rods. The other sides of the movable rods are hinged with connecting rods. A grinding device is hinged to the top of the connecting rod. Through the cooperation of structures such as the first motor, the rotating rods, the movable rods, the connecting rods, and the grinding device, the device is convenient for removing rust from nuts. The first motor drives the rotating rods to rotate, the rotating rods drive the movable rods, the movable rods can first drive the connecting rods to jack up, then the movable rods drive the connecting rods to move downward, the connecting rods drive the movable pipes to move downward, and the movable pipes can drive the grinding plates to reciprocate up and down through the limiting columns, so as to remove rust and polish the surface of the nuts.

Description

Technical Field

[0001] The invention belongs to the technical field of maintenance of the yaw system of a wind turbine, and specifically relates to an auxiliary device for repairing a yaw brake disc of a wind turbine and a using method thereof. Background Technique

[0002] During the active yaw process of the wind turbine yaw system, it is inevitable that the vibration amplitude and noise will increase significantly, resulting in poor uniformity of the active yaw movement of the wind turbine yaw system and easy generation of impacts, ultimately affecting the accuracy of the wind turbine yaw control system. In order to ensure the smooth movement of the huge nacelle and the rotor, the yaw brake maintains a certain damping on the yaw brake disc. This damping used to maintain the smooth movement of the nacelle will cause wear on the brake pads and the yaw brake disc. Since the hardness of the brake disc material is higher than that of the friction material of the friction plate, after the unit has been running for a period of time, the friction material will be completely lost. At this time, the steel part of the friction plate will rub against the brake disc, causing excessive surface wear, which will further cause jitter during the yaw process and even instability.

[0003] In the prior art, when repairing the brake disc, since the brake disc is installed inside the wind turbine, and the outer shell of the wind turbine and the installation of the brake disc are mostly fixed by nuts, tools such as wrenches are often required to disassemble the nuts, and then disassemble the brake disc for repair. However, since the nuts are made of metal, rust or thread slipping often occurs after long-term use, resulting in difficulty in disassembling the nuts with tools such as wrenches. Now, an auxiliary device for repairing the yaw brake disc of a wind turbine and a using method thereof are proposed to solve the above problems. Summary of the Invention

[0004] To solve the problems raised in the above background technique, the invention provides an auxiliary device for repairing a yaw brake disc of a wind turbine and a using method thereof, which solves the problem that the nuts rust or slip during the disassembly of the brake disc, resulting in inconvenient disassembly.

[0005] To achieve the above object, the invention provides the following technical solution: An auxiliary device for repairing a yaw brake disc of a wind turbine, including a rotating table, a first motor is fixedly connected to the middle of the inside of the rotating table, rotating rods are fixedly connected to both the left and right sides of the first motor, movable rods are hinged to the other sides of the rotating rods, connecting rods are hinged to the other sides of the movable rods, a grinding device is hinged to the top of the connecting rods, a limiter is fixedly connected to the outside of the grinding device, a limiting rod is movably clamped in the middle of the grinding device, a second motor is fixedly connected to the middle of the bottom of the rotating table, and a housing is fixedly connected to the bottom of the second motor.

[0006] Preferably, the grinder includes a movable tube. On one side inside the movable tube, a spring is fixedly connected. On the other side of the spring, a limit post is fixedly connected. On the other side of the limit post, a grinding plate is fixedly connected. In the middle of the limit post near the spring side, a moving post is fixedly connected. On the other side of the moving post, a limit ring is fixedly connected. Inside the limit ring, a limit belt is movably connected. On the top of the limit belt, a runner is fixedly connected. In the middle of the runner, a rotating post is fixedly connected. On the other side of the rotating post, a connecting rope is wound. At the bottom of the connecting rope, a support rod is fixedly connected. On the other side of the rotating post, a hairspring is fixedly connected. On the outer end of the hairspring, a sealing cover is fixedly connected.

[0007] Preferably, the limiter includes a first stop rod and a fixed cylinder. On the side of the first stop rod away from the grinding plate, a second stop rod is hinged. In the middle of the fixed cylinder, a rotating cylinder is rotatably connected. On the upper and lower sides of the outer side of the rotating cylinder, magnets are fixedly connected. On the front and back sides of the outer side of the rotating cylinder, top blocks are fixedly connected.

[0008] Preferably, the bottom of the rotating table is connected to the housing by a bearing. The bottom of the limit rod is fixedly connected to the rotating table. The outer side of the rotating rod is connected to the limit rod by a bearing. The middle of the connecting rod is movably connected to the rotating table.

[0009] Preferably, the middle of the movable tube is movably clamped with the limit rod. The outer side of the moving post is movably connected to the movable tube. The side of the grinding plate away from the limit rod is a rough surface. The outer side of the moving post is movably sleeved with the spring.

[0010] Preferably, the bottom of the limit belt is fixedly connected to the movable tube. The two ends of the rotating post are rotatably connected to the movable tube. The other side of the sealing cover is fixedly connected to the movable tube. Rubber layers are provided on both the left and right sides of the support rod. The outer side of the rubber layer is movably clamped with the limit rod.

[0011] Preferably, both the upper and lower sides of the side of the grinding plate close to the limit rod are hinged to the first stop rod. The side of the movable tube close to the grinding plate is hinged to the second stop rod.

[0012] Preferably, the side of the fixed cylinder close to the limit rod is fixedly connected to the movable tube. The rotating cylinder is located at the bottom of the middle of the first stop rod and the fixed cylinder.

[0013] Preferably, the outer end of the limit post is provided with limit convex strips at equal angles in a ring shape. The outer side of the limit convex strips is movably clamped with the movable tube. The limit belt is located between the movable tube and the limit ring.

[0014] The usage method of the auxiliary device for repairing the wind turbine yaw brake disc is as follows:

[0015] First, place the nut to be disassembled between two grinding plates. The elastic force of the spring clamps the two grinding plates. The first motor drives the rotating rod to rotate. The rotating rod drives the movable rod. The movable rod can first drive the connecting rod to jack up. The connecting rod can push the movable tube to move upward along the limiting rod. Then the movable rod drives the connecting rod to move downward, and the connecting rod drives the movable tube to move downward. The movable tube can drive the grinding plate to move up and down reciprocally through the limiting column, and can grind both sides of the nut.

[0016] Then pull the support rod downward. The support rod drives the connecting rope to unwind downward, causing the rotating column to drive the rotating wheel to rotate. The rotation of the rotating wheel can drive the limiting belt to wind. The limiting belt can tighten and push the moving column to move. The moving column can push the grinding plate to clamp the nut through the limiting column. The grinding plate drives the first stop rod, making the first stop rod and the second stop rod rotate to the horizontal. The first stop rod and the second stop rod can be adsorbed and fixed by the magnet, so that the grinding plate does not reset due to the elastic force of the spring, enabling the grinding plate to clamp the nut. The second motor drives the rotating table, and the rotating table drives the grinding plate to rotate, enabling the device to rotate and unscrew the nut to complete the operation.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] Through the cooperation of structures such as the first motor, rotating rod, movable rod, connecting rod, and grinder, the device of the present invention facilitates the rust removal of nuts. Place the nut to be disassembled between two grinding plates. The elastic force of the spring clamps the two grinding plates. The first motor drives the rotating rod to rotate. The rotating rod drives the movable rod. The movable rod can first drive the connecting rod to jack up. The connecting rod can push the movable tube to move upward along the limiting rod. Then the movable rod drives the connecting rod to move downward, and the connecting rod drives the movable tube to move downward. The movable tube can drive the grinding plate to move up and down reciprocally through the limiting column, and can grind both sides of the nut, and can rust-remove and grind the surface of the nut.

[0019] Through the cooperation of structures such as the grinding plate, limiting belt, rotating wheel, first stop rod, and second stop rod, the device of the present invention facilitates disassembly. Pull the support rod downward. The support rod drives the connecting rope to unwind downward, causing the rotating column to drive the rotating wheel to rotate. The rotation of the rotating wheel can drive the limiting belt to wind. The limiting belt can tighten and push the moving column to move. The moving column can push the grinding plate to clamp the nut through the limiting column. The grinding plate drives the first stop rod, making the first stop rod and the second stop rod rotate to the horizontal. The first stop rod and the second stop rod can be adsorbed and fixed by the magnet, so that the grinding plate does not reset due to the elastic force of the spring, enabling the grinding plate to clamp the nut. The second motor drives the rotating table, and the rotating table drives the grinding plate to rotate, enabling the device to rotate and unscrew the nut, making the device easy to disassemble. Description of the Drawings

[0020] Figure 1 Front view schematic diagram of the structure of the present invention;

[0021] Figure 2 Front cross-sectional schematic diagram of the present invention;

[0022] Figure 3 For the present invention Figure 2 Enlarged schematic diagram at position A;

[0023] Figure 4 Schematic diagram of the positional relationship between the grinder and the stopper of the present invention;

[0024] Figure 5 Side cross-sectional schematic diagram at the sealing cover of the present invention;

[0025] Figure 6 Side cross-sectional schematic diagram at the stopper of the present invention;

[0026] Figure 7 Disassembly schematic diagram of the limiting ring, limiting belt, rotating wheel, rotating column, and connecting rope of the present invention;

[0027] Figure 8 Disassembly schematic diagram of the grinding plate, first stop bar, second stop bar, fixed cylinder, rotating cylinder, and magnet of the present invention.

[0028] In the figure: 1, rotating table; 2, first motor; 3, rotating rod; 4, movable rod; 5, connecting rod; 7, grinder; 701, movable tube; 702, spring; 703, limiting column; 704, grinding plate; 705, limiting ring; 706, limiting belt; 707, rotating wheel; 708, rotating column; 709, connecting rope; 710, moving column; 711, winding spring; 712, sealing cover; 713, support rod; 8, stopper; 801, first stop bar; 802, second stop bar; 803, fixed cylinder; 804, rotating cylinder; 805, magnet; 806, top block; 9, limiting rod; 10, second motor; 11, housing. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] As Figures 1 to 8As shown in the figure, the present invention provides an auxiliary device for repairing the yaw brake disc of a fan, including a rotating table 1. In the middle of the interior of the rotating table 1, a first motor 2 is fixedly connected. On both the left and right sides of the first motor 2, a rotating rod 3 is fixedly connected. On the other side of the rotating rod 3, a movable rod 4 is hinged. On the other side of the movable rod 4, a connecting rod 5 is hinged. At the top of the connecting rod 5, a grinding device 7 is hinged. On the outside of the grinding device 7, a limiter 8 is fixedly connected. In the middle of the grinding device 7, a limiting rod 9 is movably clamped. In the middle of the bottom of the rotating table 1, a second motor 10 is fixedly connected. At the bottom of the second motor 10, a housing 11 is fixedly connected;

[0031] Place the nut to be disassembled between the two grinding devices 7. Drive the rotating rod 3 to rotate through the first motor 2. The rotating rod 3 drives the movable rod 4. The movable rod 4 can first drive the connecting rod 5 to jack up. The connecting rod 5 can push the grinding device 7 to move upward along the limiting rod 9. Then the movable rod 4 drives the connecting rod 5 to move downward. The connecting rod 5 drives the grinding device 7 to move downward. The grinding device 7 can drive the grinding device 7 to move up and down reciprocally through the limiting column 703, and can grind the two sides of the nut flat, so as to facilitate the disassembly of the nut.

[0032] As Figure 2 、 Figure 3 、 Figure 4 、 Figure 7 shown, the grinding device 7 includes a movable tube 701. On one side of the interior of the movable tube 701, a spring 702 is fixedly connected. On the other side of the spring 702, a limiting column 703 is fixedly connected. On the other side of the limiting column 703, a grinding plate 704 is fixedly connected. In the middle of the side of the limiting column 703 close to the spring 702, a moving column 710 is fixedly connected. On the other side of the moving column 710, a limiting ring 705 is fixedly connected. Inside the limiting ring 705, a limiting belt 706 is movably connected. At the top of the limiting belt 706, a runner 707 is fixedly connected. In the middle of the runner 707, a rotating column 708 is fixedly connected. On the other side of the rotating column 708, a connecting rope 709 is wound. At the bottom of the connecting rope 709, a support rod 713 is fixedly connected. On the other side of the rotating column 708, a clockwork spring 711 is fixedly connected. On the outer end of the clockwork spring 711, a sealing cover 712 is fixedly connected;

[0033] Pull the support rod 713 downward. The support rod 713 drives the connecting rope 709 to unwind downward, so that the rotating column 708 drives the runner 707 to rotate. The rotation of the runner 707 can drive the limiting belt 706 to wind. The limiting belt 706 can be tightened and push the moving column 710 to move, so that the moving column 710 can push the grinding plate 704 to clamp the nut through the limiting column 703. Then drive the rotating table 1 through the second motor 10. The rotating table 1 drives the grinding plate 704 to rotate, so that the device can rotate and unscrew the nut, making the device convenient for disassembling the nut.

[0034] As Figure 3 、Figure 4 , Figure 8 As shown in Figure 8 , the stopper 8 includes a first stop lever 801 and a fixed cylinder 803. A second stop lever 802 is hinged to the side of the first stop lever 801 away from the grinding plate 704. A rotating cylinder 804 is rotatably connected to the middle of the fixed cylinder 803. Magnets 805 are fixedly connected to both the upper and lower sides of the outer side of the rotating cylinder 804. Top blocks 806 are fixedly connected to both the front and rear sides of the outer side of the rotating cylinder 804. Both the upper and lower sides of the grinding plate 704 close to the limiting rod 9 are hinged to the first stop lever 801. The side of the movable tube 701 close to the grinding plate 704 is hinged to the second stop lever 802. The side of the fixed cylinder 803 close to the limiting rod 9 is fixedly connected to the movable tube 701. The rotating cylinder 804 is located at the bottom of the middle of the first stop lever 801 and the fixed cylinder 803;

[0035] By driving the first stop lever 801 through the grinding plate 704, the first stop lever 801 and the second stop lever 802 are rotated to the horizontal. The first stop lever 801 and the second stop lever 802 can be adsorbed and fixed by the magnets 805, so that the grinding plate 704 is not reset due to the elastic force of the spring 702, and the grinding plate 704 can clamp the nut. After the disassembly is completed, by rotating the rotating cylinder 804, the top blocks 806 can push the middle parts of the first stop lever 801 and the second stop lever 802 outwards and bend them, pull the support rod 713 upwards, so that the limiting belt 706 is reset, and the limiting column 703 can contract into the movable tube 701, so that the device can remove the nut.

[0036] As Figure 1 , Figure 2 shown in Figure 2 , the bottom of the rotating table 1 is connected to the housing 11 by a bearing. The bottom of the limiting rod 9 is fixedly connected to the rotating table 1. The outer side of the rotating rod 3 is connected to the limiting rod 9 by a bearing. The middle of the connecting rod 5 is movably connected to the rotating table 1;

[0037] The housing 11 can support and limit the rotating table 1. The rotating table 1 can fix the limiting rod 9. The limiting rod 9 can support and limit the rotating rod 3. The rotating table 1 can limit the connecting rod 5.

[0038] As Figure 2 , Figure 3 , Figure 4As shown, the middle part of the movable pipe 701 is movably clamped with the limit rod 9, the outside of the moving column 710 is movably connected with the movable pipe 701, the side of the grinding plate 704 away from the limit rod 9 is a rough surface, the outside of the moving column 710 is movably sleeved with the spring 702, the bottom of the limit belt 706 is fixedly connected with the movable pipe 701, both ends of the rotating column 708 are rotatably connected with the movable pipe 701, the other side of the sealing cover 712 is fixedly connected with the movable pipe 701, rubber layers are provided on both the left and right sides of the support rod 713, and the outside of the rubber layer is movably clamped with the limit rod 9. The outer end of the limit column 703 is provided with limit protrusions at equal angles in the circumferential direction, and the outside of the limit protrusions is movably clamped with the movable pipe 701. The limit belt 706 is located between the movable pipe 701 and the limit ring 705;

[0039] The limit rod 9 can support and limit the movable pipe 701. The movable pipe 701 can support and limit the moving column 710. The outside of the nut can be ground and clamped through the rough surface. The spring 702 can be limited through the moving column 710. The friction force can be increased through the rubber layer of the support rod 713, so that the support rod 713 can only move by an external force. The limit column 703 can be limited through the limit protrusions, and the rotation of the limit column 703 can be prevented.

[0040] The usage method of the auxiliary device for repairing the wind turbine yaw brake disc is as follows:

[0041] First, place the nut to be disassembled between the two grinding plates 704. The two grinding plates 704 are clamped through the elastic force of the spring 702. The first motor 2 drives the rotating rod 3 to rotate. The rotating rod 3 drives the movable rod 4. The movable rod 4 can first drive the connecting rod 5 to jack up. The connecting rod 5 can push the movable pipe 701 to move upward along the limit rod 9. Then the movable rod 4 drives the connecting rod 5 to move downward. The connecting rod 5 drives the movable pipe 701 to move downward. The movable pipe 701 can drive the grinding plate 704 to move up and down reciprocally through the limit column 703, and both sides of the nut can be ground;

[0042] Then pull the support rod 713 downward. The support rod 713 drives the connecting rope 709 to unwind downward, causing the rotating column 708 to drive the rotating wheel 707 to rotate. The rotation of the rotating wheel 707 can drive the limiting belt 706 to wind. The limiting belt 706 can tighten and push the moving column 710 to move, so that the moving column 710 can push the grinding plate 704 through the limiting column 703 to clamp the nut. The grinding plate 704 drives the first stop rod 801, causing the first stop rod 801 and the second stop rod 802 to rotate to the horizontal. The first stop rod 801 and the second stop rod 802 can be adsorbed and fixed by the magnet 805, so that the grinding plate 704 will not reset due to the elastic force of the spring 702, enabling the grinding plate 704 to clamp the nut. The second motor 10 drives the rotating table 1, and the rotating table 1 drives the grinding plate 704 to rotate, enabling the device to rotate and unscrew the nut to complete the operation.

[0043] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0044] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Auxiliary device for repairing wind turbine yaw brake disc, including a rotating table (1), characterized in that: A first motor (2) is fixedly connected to the middle inside the rotating table (1). Both the left and right sides of the first motor (2) are fixedly connected with rotating rods (3). The other sides of the rotating rods (3) are hinged with movable rods (4). The other sides of the movable rods (4) are hinged with connecting rods (5). The top of the connecting rod (5) is hinged with a grinding device (7). A limiter (8) is fixedly connected to the outside of the grinding device (7). A limiting rod (9) is movably clamped in the middle of the grinding device (7). A second motor (10) is fixedly connected to the middle of the bottom of the rotating table (1). The bottom of the second motor (10) is fixedly connected with a housing (11); The grinding device (7) includes a movable tube (701). A spring (702) is fixedly connected to one side inside the movable tube (701). The other side of the spring (702) is fixedly connected with a limiting column (703). The other side of the limiting column (703) is fixedly connected with a grinding plate (704). A moving column (710) is fixedly connected to the middle of the side of the limiting column (703) close to the spring (702). The other side of the moving column (710) is fixedly connected with a limiting ring (705). A limiting belt (706) is movably connected inside the limiting ring (705). The top of the limiting belt (706) is fixedly connected with a runner (707). A rotating column (708) is fixedly connected to the middle of the runner (707). A connecting rope (709) is wound around the other side of the rotating column (708). The bottom of the connecting rope (709) is fixedly connected with a support rod (713). A hairspring (711) is fixedly connected to the other side of the rotating column (708). The outer end of the hairspring (711) is fixedly connected with a sealing cover (712); The middle of the movable tube (701) is movably clamped with the limiting rod (9). The outside of the moving column (710) is movably connected with the movable tube (701). The side of the grinding plate (704) away from the limiting rod (9) is a rough surface. The outside of the moving column (710) is movably sleeved with the spring (702); The bottom of the limiting belt (706) is fixedly connected with the movable tube (701). Both ends of the rotating column (708) are rotatably connected with the movable tube (701). The other side of the sealing cover (712) is fixedly connected with the movable tube (701). Rubber layers are arranged on both the left and right sides of the support rod (713). The outside of the rubber layers is movably clamped with the limiting rod (9); Both the upper and lower sides of the side of the grinding plate (704) close to the limiting rod (9) are hinged with a first stop rod (801). The side of the movable tube (701) close to the grinding plate (704) is hinged with a second stop rod (802); Limiting convex strips are annularly and equiangularly arranged at the outer end of the limiting column (703). The outside of the limiting convex strips is movably clamped with the movable tube (701). The limiting belt (706) is located between the movable tube (701) and the limiting ring (705).

2. The auxiliary device for repairing the yaw brake disc of a fan according to claim 1, wherein: The limiter (8) includes a first stop rod (801) and a fixed cylinder (803). A second stop rod (802) is hinged to the side of the first stop rod (801) away from the grinding plate (704). A rotating cylinder (804) is rotatably connected to the middle of the fixed cylinder (803). Magnets (805) are fixedly connected to both the upper and lower sides of the outside of the rotating cylinder (804). Top blocks (806) are fixedly connected to both the front and back sides of the outside of the rotating cylinder (804).

3. The auxiliary device for repairing the yaw brake disc of a fan according to claim 1, characterized in that: The bottom of the rotating table (1) is connected to the housing (11) by a bearing. The bottom of the limiting rod (9) is fixedly connected to the rotating table (1). The outside of the rotating rod (3) is connected to the limiting rod (9) by a bearing. The middle of the connecting rod (5) is movably connected to the rotating table (1).

4. The auxiliary device for repairing the wind turbine yaw brake disc according to claim 2, wherein: The side of the fixed cylinder (803) close to the limiting rod (9) is fixedly connected to the movable tube (701). The rotating cylinder (804) is located at the bottom of the middle of the first stop rod (801) and the fixed cylinder (803).

5. Method for using the auxiliary device for repairing the yaw brake disc of a wind turbine, using the auxiliary device for repairing the yaw brake disc of a wind turbine according to claim 4, characterized in that, The operation steps are as follows: First, place the nut to be disassembled between the two grinding plates (704). Clamp it between the two grinding plates (704) by the elastic force of the spring (702). Drive the rotating rod (3) to rotate by the first motor (2). The rotating rod (3) drives the movable rod (4). The movable rod (4) can first drive the connecting rod (5) to jack up. The connecting rod (5) can push the movable tube (701) to move upward along the limiting rod (9). Then the movable rod (4) drives the connecting rod (5) to move downward. The connecting rod (5) drives the movable tube (701) to move downward. The movable tube (701) can drive the grinding plate (704) to move up and down reciprocally through the limiting column (703), and can grind both sides of the nut; Then pull the support rod (713) downward. The support rod (713) drives the connecting rope (709) to unwind downward, so that the rotating column (708) drives the rotating wheel (707) to rotate. The rotation of the rotating wheel (707) can drive the limiting belt (706) to wind. The limiting belt (706) can tighten and push the moving column (710) to move, so that the moving column (710) can push the grinding plate (704) to clamp the nut through the limiting column (703). The grinding plate (704) drives the first stop rod (801), so that the first stop rod (801) and the second stop rod (802) rotate to the horizontal. The first stop rod (801) and the second stop rod (802) can be adsorbed and fixed by the magnet (805), so that the grinding plate (704) does not reset due to the elastic force of the spring (702), so that the grinding plate (704) can clamp the nut. Drive the rotating table (1) by the second motor (10). The rotating table (1) drives the grinding plate (704) to rotate, so that the device can rotate and unscrew the nut to complete the operation.

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