Bolt and nut tightening tool and operation method

Abstract

The invention relates to the technical field of bolt and nut tightening tools, and discloses a bolt and nut tightening tool and an operation method.The top of a guide cylinder is rotationally provided with a rotating ring, a restorer is fixed in the rotating ring and rotationally assembled at the top of the guide cylinder, and the bottom end of the restorer extends into the guide cylinder to be fixedly provided with a pressurizer; a limiting cylinder is fixedly installed at the bottom end of the pressurizer, one hand of an operator stabilizes the guide cylinder, the other hand of the operator pulls the pull ring outwards to draw out the traction belt, the traction belt is released to drive the rotating shaft and the rotating ring to rotate in the forward direction and tighten the spiral twisted spring to store energy, and rotating torque is transmitted through the pressurizer to enable the limiting cylinder to drive the nut to rotate. According to the nut pre-tightening device, quick pre-tightening of the nut is achieved under the condition of not depending on electric power and an air source, in the pre-tightening process, due to continuous existence of the pressing force of the spring, the multi-step hexagonal groove and the nut keep stable meshing, slipping is restrained, pause of repeated sleeving is reduced, and more effective nut pre-tightening operation can be formed through single-time pulling.

Description

Technical Field

[0001] This invention relates to the field of bolt and nut tightening tools, and particularly to a bolt and nut tightening tool and its operating method. Background Technology

[0002] During the installation of anchor plates on wind turbines on mountains, nuts need to be installed on the bolts on the anchor plates. Due to the large number of bolts, the following problems may arise if electric socket wrenches or pneumatic hammers are used for nut installation: First, power tools and pneumatic hammers are usually heavy and bulky. Wind turbines are often installed on mountaintops or in complex environments where transport vehicles cannot reach them directly. In such cases, manual labor is required to carry the tools up the mountain, and the weight and size of the tools greatly increase the difficulty of manual handling.

[0003] Secondly, electric sockets rely on battery power, but wind turbines are usually installed in remote environments with limited battery life. When a large number of nuts need to be installed, battery life becomes a limiting factor. Pneumatic wrenches require an external air source, but there are usually no air source facilities at wind turbine installation sites. If it is necessary to temporarily carry air tanks or other air source equipment, it will not only increase the size and weight of the tools, but may also lead to insufficient air supply.

[0004] Finally, the installation site environment of wind turbines is complex. Small or irregular spaces may make it inconvenient to operate large power tools or pneumatic tools. The operating range of electric sockets or pneumatic hammers is limited, especially in small spaces and complex angles, which may make it difficult to install nuts.

[0005] Considering the weight of tools, power supply issues, air supply requirements, and environmental limitations, using electric sockets or pneumatic hammers is not practical in the installation of wind turbines. While manually pre-tightening nuts with cloth strips is less efficient, it remains a commonly used method due to its portability and ease of operation, but its installation efficiency is too low.

[0006] Therefore, this invention proposes a bolt and nut tightening tool and operating method to solve the above problems. Summary of the Invention

[0007] The purpose of this invention is to provide a bolt and nut tightening tool and operating method to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a bolt and nut tightening tool, comprising a guide cylinder, a rotating ring rotatably mounted on the top of the guide cylinder, a resetter fixed inside the rotating ring, the resetter rotatably mounted on the top of the guide cylinder, a pressure device fixedly mounted at the bottom end of the resetter extending into the interior of the guide cylinder, and a limit cylinder fixedly mounted at the bottom end of the pressure device; The resetter includes a rotating shaft rotatably mounted on the top of the guide cylinder via a bearing ring. The top end of the rotating shaft is fixed to the inner wall of the rotating ring, and the bottom end of the rotating shaft is fixedly connected to a pressure device. A vortex-shaped traction belt is wound around the outer wall of the rotating shaft, and one end of the traction belt is fixed to the outer wall of the rotating shaft. A helical spring sleeved on the outside of the rotating shaft is fixedly connected between the rotating ring and the guide cylinder.

[0009] Preferably, the guide cylinder has a hollow groove for receiving the limiting cylinder, and a guide channel communicating with the hollow groove is provided in the middle of the top of the guide cylinder. The diameter of the guide channel matches the rotating shaft, and an annular bearing groove is provided on the inner side wall of the guide channel for receiving the bearing ring.

[0010] Preferably, the rotating ring has a storage cavity for accommodating the traction belt, and a storage groove is provided at the bottom of the rotating ring. The storage groove and the storage cavity are connected by a guide hole, and the rotating shaft is fixed in the guide hole. The top end of the rotating shaft is fixed to the top of the storage cavity.

[0011] Preferably, the outer wall of the rotating ring has an opening groove communicating with the storage cavity, the other end of the pulling strap extends through the opening groove and is fixed to the rotating ring, and a shoulder strap is fixed to the top of the rotating ring.

[0012] Preferably, the top of the guide cylinder is provided with a first annular groove located outside the guide channel, and the side wall of the receiving groove away from the opening is provided with a second annular groove located outside the guide hole. The first annular groove and the second annular groove are vertically corresponding, and the two ends of the spiral spring are respectively fixed inside the first annular groove and the second annular groove.

[0013] Preferably, the top outer edge of the guide cylinder is provided with an annular sealing groove, and the bottom outer edge of the rotating ring is fixed with an annular sealing ring, which is embedded in the sealing groove.

[0014] Preferably, the pressurizer includes an outer cylinder fixed to the bottom end of the rotating shaft, a rectangular guide plate is guidedly installed at the bottom of the outer cylinder, a piston plate is fixedly installed inside the outer cylinder at the top end of the rectangular guide plate, and a support spring is fixedly connected between the top of the piston plate and the top of the inner cavity of the outer cylinder.

[0015] Preferably, the limiting cylinder is fixed to the bottom end of the rectangular guide plate, and the limiting cylinder has a storage channel for accommodating bolts inside, and the bottom of the limiting cylinder is provided with a multi-stage hexagonal groove for limiting and fitting nuts.

[0016] This invention provides a method for operating a bolt and nut tightening tool. The method utilizes the bolt and nut tightening tool and includes the following steps: S1: Install the nut on the bolt on the wind turbine anchor plate, then put the guide tube on the outside of the bolt, and at the same time put the limit tube on the nut. The pressure device compresses, so that the limit tube is always put on the nut. The guide tube can move on the bolt toward the anchor plate until it contacts the top surface of the anchor plate. S2: The guide cylinder is fixed, and the traction belt is pulled to make the rotating shaft rotate synchronously, which in turn drives the spiral spring to be compressed. The rotating shaft drives the limiting cylinder to rotate synchronously through the pressure device, so that the nut is automatically pre-tightened on the bolt. After the traction belt is pulled out, the rotating ring and the rotating shaft cooperate to drive the limiting cylinder to rotate, completing the pre-installation of the nut. S3: During the pre-tightening process of the nut, the pressure device provides extrusion force to the nut through the limiting cylinder to ensure contact between the limiting cylinder and the nut; S4: After the nuts are pre-installed, loosen the pull belt and drive the rotating ring to rotate in the opposite direction through the helical spring, so that the pull belt retracts into the rotating ring, completing the reset, and then proceed to the pre-installation of the next set of nuts.

[0017] The technical effects and advantages of this invention are as follows: This invention involves fitting a guide cylinder onto the outside of the bolt from top to bottom, aligning the multi-stage hexagonal groove of the limiting cylinder with and securing it to the nut. As the guide cylinder moves downward against the anchor plate, the support spring of the pressure device is compressed, immediately establishing a continuous downward clamping force, ensuring the limiting cylinder remains tightly against the nut. The operator holds the guide cylinder steady with one hand and pulls the pull ring outward with the other to remove the traction belt. The release of the traction belt drives the rotating shaft and rotating ring to rotate forward, simultaneously tightening the helical spring to store energy. The rotational torque is transmitted through the pressure device, causing the limiting cylinder to rotate the nut. This achieves rapid pre-tightening of the nut without relying on electricity or air. During the pre-tightening process, the continuous spring clamping force maintains stable engagement between the multi-stage hexagonal groove and the nut. The design effectively prevents slippage and reduces pauses caused by repeated re-tightening, allowing for a more efficient pre-tightening of the nuts with a single pull. Once the required tightness for pre-installation is achieved, the operator releases the pull strap, and the spiral spring releases its rebound force, causing the rotating ring and shaft to rotate in the opposite direction. The pull strap is automatically wound back into the cavity to complete its reset and resume the stroke for the next pull. The shoulder strap allows the tool to be carried around and used readily during operations inside and outside the tower. While maintaining lightweight design and on-site applicability, this design transforms the previously inefficient manual work relying on cloth strips into a structured, repeatable, and fast-paced pre-tightening operation, significantly improving the efficiency of nut pre-installation during wind turbine installation and reducing operator fatigue. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a first-view structural schematic diagram of the overall cross-section of the present invention; Figure 3 This is a schematic diagram of the overall cross-sectional structure of the present invention from a second perspective. Figure 4 This is a schematic diagram of the overall longitudinal cross-sectional structure of the present invention; Figure 5 This is a schematic cross-sectional view of the guide cylinder and rotating ring of the present invention; Figure 6 This is a schematic diagram of the assembly structure of the resetter, pressure device and limiting cylinder of the present invention.

[0019] In the diagram: 10. Guide cylinder; 11. Guide channel; 12. Bearing groove; 20. Rotary ring; 21. Storage cavity; 22. Opening groove; 23. Storage slot; 24. Guide hole; 30. Resetter; 31. Rotating shaft; 32. Bearing ring; 33. Pull belt; 34. Helical spring; 35. Pull ring; 40. Pressure device; 41. Outer cylinder; 42. Rectangular guide plate; 43. Piston plate; 44. Support spring; 50. Limiting cylinder; 51. Multi-stage hexagonal groove; 52. Storage channel; 60. Shoulder strap. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] like Figures 1 to 6As shown, this embodiment discloses a bolt and nut tightening tool, including a guide cylinder 10. A rotating ring 20 is rotatably mounted on the top of the guide cylinder 10, and a resetter 30 is fixed inside the rotating ring 20. The resetter 30 is rotatably assembled on the top of the guide cylinder 10. A pressure device 40 is fixedly mounted inside the guide cylinder 10 at the bottom end of the resetter 30. A limiting cylinder 50 is fixedly mounted at the bottom end of the pressure device 40. In actual use, the limiting cylinder 50 completes the limiting sleeve of the nut, while the pressure device 40 provides the limiting cylinder 50 with the compressive force on the nut, ensuring that the limiting cylinder 50 is always in contact with the nut. The rotating ring 20 provides external protection for the resetter 30, and the resetter 30 can drive the pressure device 40 under the pull of the worker. The nut rotates synchronously with the limiting cylinder 50, facilitating pre-tightening of the nut onto the bolt and significantly improving pre-installation efficiency. Simultaneously, it prevents misalignment of the nut during pre-tightening. Based on this, this embodiment optimizes the traditional, low-cost, electricity-free, and gas-free technique of manually tightening with cloth strips into a controllable, resettable, continuously tightening, and portable tightening tool. This ensures that operators are not hindered from completing nut installation due to space constraints, inconvenient power supply, or frequent wind, sand, rain, and fog during wind turbine anchor plate nut installation. Based on this embodiment, workers can quickly pre-tighten the nut and repeat the operation continuously, thus transforming the usable but slow cloth strip method into a lightweight and significantly more efficient dedicated nut tool.

[0022] Please see Figures 2-6 The resetter 30 includes a rotating shaft 31 rotatably mounted on the top of the guide cylinder 10 via a bearing ring 32. The top end of the rotating shaft 31 is fixed on the inner wall of the rotating ring 20, and the bottom end of the rotating shaft 31 is fixedly connected to the pressure device 40. A vortex-shaped traction belt 33 is wound and mounted on the outer wall of the rotating shaft 31, and one end of the traction belt 33 is fixed on the outer wall of the rotating shaft 31. A helical spring 34 sleeved on the outside of the rotating shaft 31 is fixedly connected between the rotating ring 20 and the guide cylinder 10.

[0023] Please see Figures 2-5 The guide cylinder 10 has a hollow groove inside for receiving the limiting cylinder 50, and a guide channel 11 connected to the hollow groove is opened in the middle of the top of the guide cylinder 10. The diameter of the guide channel 11 matches that of the rotating shaft 31. An annular bearing groove 12 is opened on the inner side wall of the guide channel 11. The bearing groove 12 is used to receive the bearing ring 32. The tightening tool uses the guide cylinder 10 as a load-bearing frame. The guide cylinder 10 has a hollow groove inside that is concentric with its axis to receive the limiting cylinder 50 and provide it with external protection. At the same time, the guide channel 11 at the top of the guide cylinder 10 enables the rotating shaft 31 to rotate stably without shaking under the premise of axial positioning. In order to make the rotation smoother and reduce the pulling resistance, the inner side wall of the guide channel 11 is further machined with an annular bearing groove 12 to accommodate the bearing ring 32. The bearing ring 32 changes the rotation support of the rotating shaft 31 from surface friction to rolling friction, thereby maintaining a light feel and durability in the cycle of repeated pulling and reset.

[0024] Please see Figure 5 The rotating ring 20 has a storage cavity 21 inside to accommodate the pull belt 33. A storage groove 23 is opened at the bottom of the rotating ring 20. The storage groove 23 and the storage cavity 21 are connected by a guide hole 24. The rotating shaft 31 is fixed in the guide hole 24, and the top end of the rotating shaft 31 is fixed to the top of the storage cavity 21. An opening groove 22 communicating with the storage cavity 21 is opened on the outer wall of the rotating ring 20. The other end of the pull belt 33 extends out of the rotating ring 20 through the opening groove 22 and is fixed with a pull ring 35. A shoulder strap 60 is fixed at the top of the rotating ring 20. The shoulder strap 60 is convenient for carrying tightening tools. The operator only needs to pull the pull ring 35 outward to make the pull belt 33 smoothly released in the storage cavity 21 and drive the rotating shaft 31 to rotate, thereby efficiently converting the linear tension into the rotational torque required to tighten the nut. The storage groove 23 can provide compression and return spring space for the helical spring 34 to prevent structural interference.

[0025] Please see Figure 4 and Figure 5 The top of the guide cylinder 10 is provided with a first annular groove located outside the guide channel 11. The side wall of the receiving groove 23 away from the opening is provided with a second annular groove located outside the guide hole 24. The first and second annular grooves are vertically aligned. The two ends of the spiral spring 34 are fixed inside the first and second annular grooves respectively. When the rotating ring 20 rotates forward with the rotating shaft 31, the spiral spring 34 is twisted and stores energy. After being released, the spring releases the rebound force to drive the rotating ring 20 and the rotating shaft 31 to rotate in the opposite direction, thereby automatically retracting the pulling belt 33 into the receiving cavity 21 to complete the reset. The spiral spring 34 is responsible for converting the elastic potential energy stored in the previous pull into the rotation of the reverse reset, so that the tightening tool has a lighter continuous cycle capability. The operator does not need to manually adjust the pulling belt 33 before tightening the next set of nuts.

[0026] The top outer edge of the guide cylinder 10 is provided with an annular sealing groove, and the bottom outer edge of the rotating ring 20 is fixed with an annular sealing ring, which is embedded in the sealing groove, so that the rotating ring 20 and the guide cylinder 10 form a reliable compression sealing fit, preventing dust, salt spray and rainwater commonly found at wind turbine installation sites from entering the interior of the rotating ring 20.

[0027] Please see Figures 2-6The pressurizer 40 includes an outer cylinder 41 fixed to the bottom end of the rotating shaft 31. A rectangular guide plate 42 is mounted on the bottom of the outer cylinder 41. A piston plate 43 is fixed inside the outer cylinder 41 with its top end extending into the outer cylinder 41. A support spring 44 is fixedly connected between the top of the piston plate 43 and the top of the inner cavity of the outer cylinder 41. In actual use, the support spring 44 will be compressed, providing the rectangular guide plate 42 with a squeezing force on the limiting cylinder 50. The presence of the rectangular guide plate 42 can cause the pressurizer 40 and the limiting cylinder 50 to rotate synchronously with the rotating shaft 31, thereby enabling... The rotation drive and axial clamping of the limiting cylinder 50 can be coupled within the same axis. The outer cylinder 41 is fixed to the bottom end of the rotating shaft 31 and rotates together with the rotating shaft 31. So when the guide cylinder 10 is sleeved on the outside of the bolt and presses down against the anchor plate, the limiting cylinder 50 will first contact the nut and be subjected to a reaction force. The reaction force is transmitted through the rectangular guide plate 42, causing the piston plate 43 to move upward relative to the outer cylinder 41 and compress the support spring 44. The support spring 44 then forms a stable downward thrust that acts in the opposite direction on the rectangular guide plate 42 and the limiting cylinder 50, thereby achieving continuous clamping of the nut.

[0028] It should be noted that the rectangular guide plate 42 is not a round rod guide. Its purpose is to limit relative rotation and improve the resistance to eccentric loads by using a non-circular cross-section guide. This makes it less likely for the rectangular guide plate 42 to swing and get stuck during axial reciprocating motion. At the same time, it can reliably transmit the torque generated by the rotation of the outer cylinder 41 to the rectangular guide plate 42 and the limiting cylinder 50 below it. This ensures that the cylinder is pressed and fitted while rotating synchronously with the rotating shaft 31, avoiding slippage, corner chipping, or dislodging caused by axial floating on site. Also, because of the continuous extrusion force provided by the pressure device 40, the fit of the limiting cylinder 50 to the nut will not be tightened or loosened erratically with the pulling rhythm. The pre-tightening process is more consistent, and the nut is easier to stably start and quickly descend along the bolt thread.

[0029] Please see Figure 4The limiting cylinder 50 is fixed to the bottom end of the rectangular guide plate 42, and the limiting cylinder 50 has a storage channel 52 for accommodating bolts inside. The bottom of the limiting cylinder 50 is provided with a multi-stage hexagonal groove 51 for limiting and fitting the nut. The storage channel 52 accommodates the bolt and provides coaxial limiting. The storage channel 52 allows the tool to automatically align with the bolt axis when it is pressed down and fitted into the nut, reducing the time the operator spends repeatedly aligning in high or narrow positions. The multi-stage structure of the multi-stage hexagonal groove 51 can form a step-by-step positioning surface, making it easier to align when the limiting cylinder is pressed down. On the other hand, it can accommodate nuts of different heights or diameters, and the stepped shoulder forms an axial abutment positioning, so that under the continuous pressure of the pressure device 40, To ensure the proper engagement depth between the multi-stage hexagonal groove 51 and the outer hexagon of the nut, slippage is reduced and torque transmission efficiency is improved. Thus, when the worker pulls the traction belt 33, the rotating shaft 31 drives the outer cylinder 41 to rotate and transmits the torque to the limiting cylinder 50 via the rectangular guide plate 42. The multi-stage hexagonal groove 51 at the bottom of the limiting cylinder 50 reliably engages with the nut, driving the nut to rotate. At the same time, the guide cylinder 10, as an outer sleeve, is stably supported by the other hand and aligned with the bolt axis on the anchor plate. The guide channel 11 and the storage channel 52 together form a double coaxial constraint of upper rotating shaft 31 guidance and lower bolt guidance. Therefore, the rotational force will not be consumed by eccentricity, and the nut can move more smoothly along the thread and complete the pre-tightening.

[0030] This embodiment discloses an operation method for a bolt and nut tightening tool. The operation method involves the following steps: S1: Install the nut on the bolt on the wind turbine anchor plate, then put the guide cylinder 10 on the outside of the bolt, and at the same time put the limiting cylinder 50 on the nut. The pressure device 40 compresses, so that the limiting cylinder 50 is always put on the nut. The guide cylinder 10 can move on the bolt toward the anchor plate until it contacts the top surface of the anchor plate. S2: The guide cylinder 10 is fixed, and the traction belt 33 is pulled to make the rotating shaft 31 rotate synchronously, which in turn drives the spiral spring 34 to be compressed. The rotating shaft 31 drives the limiting cylinder 50 to rotate synchronously through the pressure device 40, so that the nut is automatically pre-tightened on the bolt. After the traction belt 33 is pulled out, the rotating ring 20 and the rotating shaft 31 cooperate to drive the limiting cylinder 50 to rotate, completing the pre-installation of the nut. S3: During the pre-tightening of the nut, the pressure device 40 provides extrusion force to the nut through the limiting cylinder 50 to ensure that the limiting cylinder 50 and the nut are in contact; S4: After the nuts are pre-installed, loosen the pull belt 33, and drive the rotating ring 20 to rotate in the opposite direction through the helical spring 34, so that the pull belt 33 retracts into the rotating ring 20, completing the reset, and then proceed to the next set of nuts pre-installation.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A bolt and nut tightening tool characterized by: Including the guide cylinder (10), the guide cylinder (10) top rotary mounting has the swivel (20), the swivel (20) inside fixed reset ware (30), reset ware (30) rotary assembly in the guide cylinder (10) top, the bottom end of reset ware (30) extends into the guide cylinder (10) inside fixed mounting has pressurizer (40), the bottom end of pressurizer (40) fixed mounting has limit cylinder (50); The reset ware (30) includes the rotating shaft (31) that is rotatably assembled on the top of the guide cylinder (10) through the bearing ring (32), the top end of the rotating shaft (31) is fixed on the inner side wall of the swivel (20), the bottom end of the rotating shaft (31) is fixedly connected with the pressurizer (40), and the outer side wall of the rotating shaft (31) is wound with a pull belt (33) in the shape of a vortex, one end of the pull belt (33) is fixed on the outer side wall of the rotating shaft (31), and the swivel (20) and the guide cylinder (10) are fixedly connected with a spiral spring (34) sleeved on the outer side of the rotating shaft (31).

2. The bolt nut tightening tool according to claim 1, characterized by: The guide cylinder (10) is provided with a hollow slot for accommodating the limit cylinder (50), and the top of the guide cylinder (10) is provided with a guide channel (11) in communication with the hollow slot, the guide channel (11) has a hole diameter matched with the rotating shaft (31), and the inner side wall of the guide channel (11) is provided with an annular bearing groove (12).

3. The bolt nut tightening tool according to claim 2, characterized by: The swivel (20) is provided with a receiving cavity (21) for accommodating the pull belt (33), the bottom of the swivel (20) is provided with a receiving slot (23), the receiving slot (23) and the receiving cavity (21) are in communication through a guide hole (24), and the rotating shaft (31) is fixed in the guide hole (24), and the top end of the rotating shaft (31) is fixed to the top of the receiving cavity (21).

4. The bolt and nut tightening tool according to claim 3, characterized in that: The outer side wall of the swivel (20) is provided with an opening slot (22) in communication with the receiving cavity (21), the other end of the pull belt (33) extends out of the swivel (20) through the opening slot (22) and is fixed with a pull ring (35), and the top of the swivel (20) is fixed with a shoulder strap (60).

5. The bolt nut tightening tool according to claim 3, characterized by: The top of the guide cylinder (10) is provided with a first annular groove arranged outside the guide channel (11), the side wall of the receiving slot (23) away from the opening is provided with a second annular groove arranged outside the guide hole (24), and the first annular groove and the second annular groove correspond to each other, and the two ends of the spiral spring (34) are fixed in the first annular groove and the second annular groove respectively.

6. The bolt nut tightening tool according to claim 3, characterized by: The top outer edge of the guide cylinder (10) is provided with an annular sealing groove, and the bottom outer edge of the swivel (20) is fixed with an annular sealing ring, and the sealing ring is embedded in the sealing groove.

7. The bolt nut tightening tool according to claim 1, characterized by: The presser (40) comprises an outer cylinder (41) fixed to the bottom end of the rotating shaft (31), a rectangular guide plate (42) is mounted at the bottom of the outer cylinder (41), the top end of the rectangular guide plate (42) extends into the inner part of the outer cylinder (41) and is fixed with a piston plate (43), and the top part of the piston plate (43) and the inner cavity top part of the outer cylinder (41) are fixedly connected with a supporting spring (44).

8. The bolt nut tightening tool according to claim 7, characterized by: The limiting cylinder (50) is fixed to the bottom end of the rectangular guide plate (42), and a receiving channel (52) for accommodating the bolt is formed in the inner part of the limiting cylinder (50), and the bottom part of the limiting cylinder (50) is provided with a multi-stage hexagonal groove (51) for limiting and sleeving the nut.

9. A method of operating a bolt and nut tightening tool, implemented using the bolt and nut tightening tool according to any one of claims 1 to 8, characterized in that: The steps of the operation method are: S1: install the nut on the bolt on the anchor plate of the wind driven generator, then sleeve the guide cylinder (10) outside the bolt, sleeve the limiting cylinder (50) on the nut, the presser (40) is compressed, the limiting cylinder (50) is sleeved on the nut at all times, the guide cylinder (10) can move on the bolt in the direction of the anchor plate until the top surface of the anchor plate is contacted; S2: the guide cylinder (10) is fixed, the pulling belt (33) is pulled, the rotating shaft (31) is synchronously rotated, the helical spring (34) is compressed, the rotating shaft (31) drives the limiting cylinder (50) to synchronously rotate through the presser (40), the nut is automatically pre-tightened on the bolt; after the pulling belt (33) is pulled out, the rotating ring (20) drives the limiting cylinder (50) to rotate in cooperation with the rotating shaft (31), and the pre-installation of the nut is completed; S3: in the process of pre-tightening the nut, the presser (40) provides extrusion force to the nut through the limiting cylinder (50), and ensures that the limiting cylinder (50) and the nut are in contact; S4: after the pre-installation of the nut is completed, the pulling belt (33) is loosened, the rotating ring (20) is reversely rotated through the helical spring (34), the pulling belt (33) is retracted in the rotating ring (20), the reset is completed, and then the pre-installation of the next group of nuts is carried out.

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