Tower bolt pre-tightening device of wind generating set

Abstract

The invention relates to the technical field of pre-tightening devices, in particular to a tower bolt pre-tightening device of a wind generating set. Comprising a shell, a rotating disc, a socket spanner and a driving motor, the shell is cylindrical, one end of the shell arranged in the axial direction is open, and the other end of the shell is closed; a plurality of mounting holes which are formed at intervals in the circumferential direction are formed in the rotating disc, the mounting holes are used for mounting the socket wrenches, and the driving motor is fixed to the shell and connected with the socket wrenches through a quick release structure; and the turntable is rotatably arranged in the shell so as to drive the socket wrenches at different positions to correspond to the driving motor. According to the wind generating set tower bolt pre-tightening device, bolts of different models can be pre-tightened through one device, it is not needed to manually replace a socket spanner, and operation is easy and convenient.

Description

Technical Field

[0001] This application relates to the field of pre-tightening device technology, and in particular to a pre-tightening device for tower bolts of wind turbine generator sets. Background Technology

[0002] During the installation of wind turbine towers, a wrench is needed to pre-tighten the bolts around the bottom. To save energy, construction workers often choose electric wrenches for this purpose. However, since the bolt types at the bottom of wind turbine towers may vary, workers need to carry different wrenches to pre-tighten different types of bolts, which is inconvenient. Summary of the Invention

[0003] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, this application provides a wind turbine tower bolt pre-tightening device.

[0004] This application provides a pre-tightening device for tower bolts of a wind turbine generator, including a housing, a turntable, a socket wrench, and a drive motor. The housing is cylindrical in shape, with one end open and the other closed along the axial direction. The turntable has multiple mounting holes spaced apart circumferentially for mounting the socket wrench. The drive motor is fixed to the housing and connected to the socket wrench via a quick-release structure. The turntable is rotatably disposed inside the housing to drive the socket wrench at different positions to correspond with the drive motor.

[0005] In some embodiments, the turntable is slidably connected to the inner wall of the housing so that the turntable can move axially.

[0006] In some embodiments, the socket wrench passes through the mounting hole, with a first end of the socket wrench located on the side of the turntable facing the drive motor, and a second end of the socket wrench located on the side of the turntable facing away from the drive motor; the quick-release structure includes a snap-fit ​​groove provided on the first end of the socket wrench and a snap-fit ​​shaft provided on the output shaft of the drive motor.

[0007] In some embodiments, two first mounting grooves are symmetrically arranged axially on the inner wall of the mounting hole. A snap-fit ​​block is provided in the first mounting groove. The snap-fit ​​block is connected to the bottom of the first mounting groove by a first elastic element so that the snap-fit ​​block can extend into the mounting hole. A snap-fit ​​section is provided between the first end and the second end of the socket wrench. A second mounting groove is provided on the snap-fit ​​section at a position corresponding to the first mounting groove. The second mounting groove is an annular groove arranged circumferentially along the snap-fit ​​section. The two ends of the snap-fit ​​block are located in the first mounting groove and the second mounting groove, respectively, to fix the socket wrench.

[0008] In some embodiments, the turntable has a connecting hole on the side facing away from the drive motor, the connecting hole communicating with the wall of the first mounting groove, and the snap-fit ​​block has a fixing mechanism on the side facing away from the drive motor, the fixing mechanism being connected to the side of the turntable facing away from the drive motor to fix the position of the snap-fit ​​block.

[0009] In some embodiments, the fixing mechanism includes a first connecting rod, a second connecting rod, and a limiting part. The first connecting rod is movably inserted into the communicating hole and fixedly connected to the snap-fit ​​block, enabling the snap-fit ​​block to move along the direction approaching and away from the second mounting groove. The second connecting rod is located outside the communicating hole and is hinged to the end of the first connecting rod away from the snap-fit ​​block. The limiting part is disposed at the end of the second connecting rod away from the first connecting rod. The turntable has a limiting groove on the side facing away from the drive motor, and the limiting groove is used to cooperate with the limiting part to fix the position of the snap-fit ​​block.

[0010] In some embodiments, the outer circumferential surface of the turntable is provided with a third mounting groove recessed towards the axis, and a ball bearing is provided in the third mounting groove. The ball bearing protrudes from the opening of the third mounting groove and is in rolling connection with the inner wall of the outer casing.

[0011] In some embodiments, a pressing rod is also included. The turntable has a first annular groove on the side facing the drive motor. The closed end of the housing has a through hole, which corresponds to the first annular groove. The pressing rod passes through the through hole into the interior of the housing and slides in cooperation with the first annular groove.

[0012] In some embodiments, the turntable is further provided with a second annular groove on the side facing the drive motor, and also includes a reset mechanism. The reset mechanism includes a mounting cylinder, a sliding rod, and a second elastic element. The mounting cylinder is fixed along the axial direction of the housing to the inner wall of the closed end of the housing. One end of the sliding rod is inserted into the mounting cylinder and connected to the mounting cylinder through the second elastic element. The other end of the sliding rod is slidably engaged with the second annular groove.

[0013] In some embodiments, a handle is provided on the outer surface of the closed end of the housing.

[0014] The technical solution provided in this application has the following advantages compared with the prior art:

[0015] The wind turbine tower bolt pre-tightening device provided in this application embodiment allows for the switching of different specifications of socket wrenches and their corresponding drive motors via a rotating turntable, enabling pre-tightening of bolts of different models. In use, the drive motor rotates the corresponding socket wrench to pre-tighten the wind turbine tower bolts. When a socket wrench switch is required, the drive motor and socket wrench are disassembled via a quick-release mechanism. The turntable, no longer restricted by the drive motor, can rotate freely. When the desired socket wrench is selected, the drive motor is connected to that wrench, allowing it to pre-tighten the corresponding bolt size. This wind turbine tower bolt pre-tightening device provides a single device that can pre-tighten different bolt models without the need for manual socket wrench replacement, making operation simple and convenient. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the wind turbine tower bolt pre-tightening device described in the embodiments of this application;

[0019] Figure 2 This is a cross-sectional view of the wind turbine tower bolt pre-tightening device described in the embodiments of this application;

[0020] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0021] Figure 4 This is a schematic diagram of the socket wrench described in the embodiment of this application.

[0022] Wherein, 1 is the outer shell; 101 is the closed end; and 102 is the open end.

[0023] 2. Drive motor;

[0024] 3. Socket wrench; 31. First end; 32. Second end; 301. Second mounting slot;

[0025] 4. Turntable; 401. First mounting slot; 402. Connecting hole;

[0026] 5. Pressing rod; 501. Pressing block; 502. First slider;

[0027] 6. Mounting cylinder; 7. Second elastic element; 8. Sliding rod; 801. Second slider; 9. Ball bearing; 10. Handle; 11. Anti-slip handle; 12. Snap-fit ​​block; 13. First elastic element; 14. First connecting rod; 15. Second connecting rod; 16. Limiting part. Detailed Implementation

[0028] To better understand the above-mentioned objectives, features, and advantages of this application, the solution of this application will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0029] Many specific details are set forth in the following description in order to provide a full understanding of this application, but this application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of this application, and not all embodiments.

[0030] like Figures 1 to 3 As shown in the figure, this application embodiment provides a wind turbine tower bolt pre-tightening device, including a housing 1, a turntable 4, socket wrenches 3, and a drive motor 2. The housing 1 is cylindrical in shape, with one end open and the other closed along the axial direction. It can be understood that the housing 1 is a cylindrical structure with an internal cavity and one open end. The turntable 4 has multiple mounting holes spaced circumferentially for mounting socket wrenches 3. The socket wrenches 3 in the multiple mounting holes can be of the same or different models. The drive motor 2 is fixed to the housing 1, and the output shaft of the drive motor 2 extends into the interior of the housing and is connected to one of the socket wrenches 3 through a quick-release structure. The turntable 4 is rotatably disposed inside the housing 1 to drive socket wrenches 3 in different positions to correspond with the drive motor 2.

[0031] The drive motor 2 is located directly above the socket wrench 3, and is fixedly connected to the outer wall of the housing 1 outside the closed end 101. The closed end 101 of the housing 1 has a through hole. The output shaft of the drive motor 2 passes through the through hole and is connected to the socket wrench 3 via a quick-release mechanism. The output shaft of the drive motor 2 and the through hole are rotatably connected via bearings. Thus, when the drive motor 2 rotates, it can drive the corresponding socket wrench 3 to rotate. When the desired socket wrench 3 is reached, the drive motor 2 and the socket wrench 3 are fixedly connected via the quick-release mechanism.

[0032] In use, the drive motor 2 drives the corresponding socket wrench 3 to rotate, thereby pre-tightening the bolts on the wind turbine tower. When it is necessary to switch socket wrenches 3, the drive motor 2 and socket wrench 3 can be separated through a quick-release structure. The turntable 4 is no longer restricted by the drive motor 2 and can rotate. When it rotates to the required socket wrench 3, the drive motor 2 is connected to that socket wrench 3, and the drive motor 2 can drive the socket wrench 3 to pre-tighten the bolts of the corresponding specifications. The wind turbine tower bolt pre-tightening device provided in this application embodiment can pre-tighten different types of bolts with a single device, without the need for manual replacement of socket wrenches 3, making operation simple and convenient.

[0033] In some embodiments of this application, the turntable 4 is slidably connected to the inner wall of the housing 1, so that the turntable 4 can move axially relative to the housing 1. When switching the socket wrench 3, the quick-release structure connecting the drive motor 2 and the socket wrench 3 is first disassembled, and then the turntable 4 is pushed axially to prevent interference between the drive motor 2 and the socket wrench 3. At this time, the turntable 4 is rotated so that the required socket wrench 3 is rotated to the underside of the drive motor 2. The turntable 4 is pushed in a way that approaches the drive motor 2, and the drive motor 2 and the socket wrench 3 are connected together through the quick-release structure.

[0034] like Figure 4 As shown, in some embodiments of this application, the socket wrench 3 passes through the mounting hole, and the two ends of the socket wrench 3 along the axial direction are a first end 31 and a second end 32, wherein the first end 31 of the socket wrench 3 is located on the side of the turntable 4 facing the drive motor 2, and the second end 32 of the socket wrench 3 is located on the side of the turntable 4 away from the drive motor 2 (that is, the side facing the open end 102 of the housing 1); the quick-release structure includes a snap-fit ​​groove provided on the first end 31 of the socket wrench 3 and a snap-fit ​​shaft 17 provided on the output shaft of the drive motor 2.

[0035] Specifically, the snap-fit ​​shaft 17 is polygonal in shape, or snap-fit ​​protrusions are provided on the side of the snap-fit ​​shaft 17. The shape of the snap-fit ​​groove is adapted to the shape of the snap-fit ​​shaft 17. When the snap-fit ​​shaft 17 is inserted into the snap-fit ​​groove, the snap-fit ​​shaft 17 and the snap-fit ​​groove can move relative to each other axially, but cannot rotate relative to each other circumferentially. That is to say, when the snap-fit ​​shaft 17 rotates, it can drive the socket wrench 3 connected to it to rotate synchronously.

[0036] It should be noted that the snap-fit ​​shaft 17 can also be other shapes, as long as it can satisfy the requirement that the snap-fit ​​shaft 17 and the snap-fit ​​groove can move relative to each other in the axial direction but cannot rotate relative to each other in the circumferential direction.

[0037] The second end 32 of the socket wrench 3 is provided with a locking groove that mates with the bolt. The shape or size of the locking groove varies for different models of socket wrenches 3.

[0038] In some embodiments of this application, two first mounting grooves 401 are symmetrically arranged along the axial direction on the inner wall of the mounting hole. A snap-fit ​​block 12 is provided in the first mounting groove 401. The snap-fit ​​block 12 is connected to the bottom of the first mounting groove 401 through a first elastic member 13, so that the snap-fit ​​block 12 can be inserted into the mounting hole under the elastic support of the first elastic member 13. A snap-fit ​​section is provided between the first end 31 and the second end 32 of the socket wrench 3. The snap-fit ​​section is correspondingly arranged with the inner wall of the mounting hole. A second mounting groove 301 is provided on the snap-fit ​​section at the position corresponding to the first mounting groove 401. The second mounting groove 301 is an annular groove arranged circumferentially along the snap-fit ​​section. The two ends of the snap-fit ​​block 12 are respectively located in the first mounting groove 401 and the second mounting groove 301 to fix the socket wrench 3.

[0039] Specifically, when installing the socket wrench 3, pressing the locking block 12 retracts it into the first mounting groove 401. At this time, the first end 31 of the socket wrench 3 can pass through the mounting hole. Releasing the locking block 12 allows it to extend into the second mounting groove 301 under the elastic force of the first elastic element 13, thus fixing the socket wrench 3. At this point, the socket wrench 3 cannot move axially. However, since the second mounting groove 301 is an annular groove, when the drive motor 2 rotates the socket wrench 3, the locking block 12 slides within the second mounting groove 301, without affecting the normal rotation of the socket wrench 3. In some embodiments of this application, the first elastic element 13 is a spring.

[0040] It should be noted that in order to enable the socket wrench 3 to rotate, the locking block 12 and the second mounting groove 301 are in a sliding fit, with a gap between them, and they cannot be tightly abutted together.

[0041] In some embodiments of this application, the turntable 4 has a connecting hole 402 on the side facing away from the drive motor 2. The connecting hole 402 communicates with the groove wall of the first mounting groove 401. The snap-fit ​​block 12 has a fixing mechanism on the side facing away from the drive motor 2. The fixing mechanism is connected to the side of the turntable 4 facing away from the drive motor 2 to fix the position of the snap-fit ​​block 12. That is, the fixing mechanism is connected between the snap-fit ​​block 12 and the turntable 4. Through the connection between the fixing mechanism and the turntable 4, the position of the snap-fit ​​block 12 is fixed, preventing the position of the snap-fit ​​block 12 from changing after the socket wrench 3 is installed, thus affecting the installation effect of the socket wrench 3. When it is necessary to disassemble the socket wrench 3, the fixing mechanism is disengaged from the turntable 4. At this time, the constraint of the fixing mechanism on the snap-fit ​​block 12 disappears, and the socket wrench 3 can retract into the first mounting groove 401 under the action of external force, avoiding cooperation with the second mounting groove 301. In this way, the socket wrench 3 can be taken out from the mounting hole.

[0042] In some embodiments of this application, the fixing mechanism includes a first connecting rod 14, a second connecting rod 15, and a limiting part 16. The first connecting rod 14 is movably inserted into the communicating hole 402 and is fixedly connected to the snap-fit ​​block 12, which can drive the snap-fit ​​block 12 to move in the direction of approaching and moving away from the second mounting groove 301. The second connecting rod 15 is located outside the communicating hole 402 and is hinged to the end of the first connecting rod 14 away from the snap-fit ​​block 12. The turntable 4 is provided with a limiting groove on the side facing away from the drive motor 2. The limiting groove is used to cooperate with the limiting part 16 to fix the position of the snap-fit ​​block 12.

[0043] For example, such as Figure 3 As shown, taking one of the fixed examples, the lower end of the first connecting rod 14 extends out of the connecting hole 402, the right end of the second connecting rod 15 is hinged to the lower end of the first connecting rod 14, and a limiting part 16 is provided on the left end. The limiting part 16 is spherical or cylindrical and is interference-fitted with the limiting groove. They are locked together by friction. When the limiting part 16 is engaged with the limiting groove, the right end of the locking block 12 is located in the second mounting groove 301. At this time, the second connecting rod 15 and the first connecting rod 14 are in a perpendicular state. When the 16 is engaged with the limiting groove, the first connecting rod 14 cannot move left or right under the action of the second connecting rod 15, thus fixing the position of the engaging block 12. When the socket wrench 3 needs to be disassembled, the limiting part 16 is disengaged from the limiting groove, the constraint force of the second connecting rod 15 on the first connecting rod 14 disappears, and the first connecting rod 14 is pushed to the left, which can drive the engaging block 12 to move to the left, thus disengaging from the second mounting groove 301. The socket wrench 3 can be disassembled from the mounting hole, making it convenient to replace the socket wrench 3.

[0044] In some embodiments of this application, a third mounting groove is provided on the outer circumferential surface of the turntable 4, which is recessed towards the axis. The third mounting groove is an annular groove, and a plurality of balls 9 are provided in the third mounting groove. The balls 9 protrude from the opening of the third mounting groove and are in rolling contact with the inner wall of the outer casing 1. The balls 9 roll in the third mounting groove, which enables the turntable 4 to rotate circumferentially and move axially.

[0045] In some embodiments of this application, the wind turbine tower bolt pre-tightening device further includes a pressing rod 5, a first annular groove is provided on the side of the turntable 4 facing the drive motor 2, a first through hole is provided on the closed end 101 of the outer shell 1, the through hole is corresponding to the first annular groove, and the pressing rod 5 passes through the through hole into the interior of the outer shell 1 and slides in cooperation with the first annular groove.

[0046] Specifically, a first slider 502 is provided in the first annular groove, and the end of the pressing rod 5 is fixedly connected to the first slider 502. The first slider 502 can slide along the first annular groove, thereby causing the pressing rod 5 to slide relative to the first annular groove. When a pressing force is applied to the pressing rod 5, the pressing rod 5 pushes the turntable 4 to move away from the drive motor 2, causing the drive motor 2 to disengage from the socket wrench 3. At this time, the socket wrench 3 can be switched by rotating the turntable 4. Since the pressing rod 5 and the first annular groove are in sliding fit, the rotation of the turntable 4 is not affected by the pressing rod 5, ensuring the switching efficiency of the socket wrench 3. A pressing block 501 is provided at one end of the pressing rod 5 located outside the outer casing 1, which facilitates the operator to perform the pressing operation.

[0047] In some embodiments of this application, the turntable 4 is further provided with a second annular groove on the side facing the drive motor 2. The wind turbine tower bolt pre-tightening device also includes a reset structure. The reset mechanism includes a mounting cylinder 6, a sliding rod 8, and a second elastic element 7. The mounting cylinder 6 is fixed along the axial direction of the outer shell 1 to the inner wall of the closed end 101 of the outer shell 1. One end of the sliding rod 8 is inserted into the mounting cylinder 6 and connected to the mounting cylinder 6 through the second elastic element 7. The other end of the sliding rod 8 is slidably engaged with the second annular groove. When the pressing rod 5 is pressed, the second elastic element 7 is stretched. When the pressing rod 5 is released, under the elastic force of the second elastic element 7, the sliding rod 8 moves along the closed end 101 near the outer shell 1 to reset, thereby driving the turntable 4 to move synchronously, so that the snap-fit ​​shaft on the drive motor 2 engages with the snap-fit ​​groove on the socket wrench 3. A second slider 801 is provided in the second annular groove. The second slider 801 is slidably disposed in the second annular groove. The lower end of the sliding rod 8 is connected to the second slider 801. When the turntable 4 rotates, the sliding rod 8 is fixed, and the second slider 801 slides in the second annular groove without affecting the normal rotation of the turntable 4. In some embodiments of this application, the second elastic element 7 is a spring.

[0048] In some embodiments of this application, the wind turbine tower bolt pre-tightening device further includes a handle 10, which is disposed on the outer side of the closed end 101 of the housing 1, and the handle 10 is provided with an anti-slip handle 11 for easy handholding by the operator.

[0049] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0050] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pre-tightening device for tower bolts of a wind turbine generator set, characterized in that, The device includes a housing, a turntable, socket wrenches, and a drive motor. The housing is cylindrical, with one end open and the other closed along the axial direction. The turntable has multiple circumferentially spaced mounting holes for mounting the socket wrenches. The drive motor is fixed to the housing and connected to the socket wrenches via a quick-release mechanism. The turntable is rotatably disposed inside the housing to drive the socket wrenches at different positions to correspond with the drive motor.

2. The wind turbine tower bolt pre-tightening device according to claim 1, characterized in that, The turntable is slidably connected to the inner wall of the outer casing so that the turntable can move axially.

3. The wind turbine tower bolt pre-tightening device according to claim 1, characterized in that, The socket wrench passes through the mounting hole, with the first end of the socket wrench located on the side of the turntable facing the drive motor, and the second end of the socket wrench located on the side of the turntable facing away from the drive motor; the quick-release structure includes a snap-fit ​​groove provided on the first end of the socket wrench and a snap-fit ​​shaft provided on the output shaft of the drive motor.

4. The wind turbine tower bolt pre-tightening device according to claim 3, characterized in that, Two first mounting grooves are symmetrically arranged axially on the inner wall of the mounting hole. A snap-fit ​​block is provided in the first mounting groove. The snap-fit ​​block is connected to the bottom of the first mounting groove by a first elastic element so that the snap-fit ​​block can extend into the mounting hole. A snap-fit ​​section is provided between the first end and the second end of the socket wrench. A second mounting groove is provided on the snap-fit ​​section at a position corresponding to the first mounting groove. The second mounting groove is an annular groove arranged circumferentially along the snap-fit ​​section. The two ends of the snap-fit ​​block are located in the first mounting groove and the second mounting groove, respectively, to fix the socket wrench.

5. The wind turbine tower bolt pre-tightening device according to claim 4, characterized in that, The turntable has a connecting hole on the side facing away from the drive motor. The connecting hole communicates with the wall of the first mounting groove. The snap-fit ​​block has a fixing mechanism on the side facing away from the drive motor. The fixing mechanism is connected to the side of the turntable facing away from the drive motor to fix the position of the snap-fit ​​block.

6. The wind turbine tower bolt pre-tightening device according to claim 5, characterized in that, The fixing mechanism includes a first connecting rod, a second connecting rod, and a limiting part. The first connecting rod is movably inserted into the communicating hole and fixedly connected to the snap-fit ​​block, enabling the snap-fit ​​block to move in a direction closer to and further away from the second mounting groove. The second connecting rod is located outside the communicating hole and is hinged to the end of the first connecting rod away from the snap-fit ​​block. The limiting part is provided at the end of the second connecting rod away from the first connecting rod. The turntable has a limiting groove on the side facing away from the drive motor, and the limiting groove is used to cooperate with the limiting part to fix the position of the snap-fit ​​block.

7. The wind turbine tower bolt pre-tightening device according to claim 1, characterized in that, The outer circumference of the turntable is provided with a third mounting groove that is recessed towards the axis. A ball bearing is provided in the third mounting groove. The ball bearing protrudes from the opening of the third mounting groove and is in rolling connection with the inner wall of the outer shell.

8. The wind turbine tower bolt pre-tightening device according to claim 1, characterized in that, It also includes a pressing rod. The turntable has a first annular groove on the side facing the drive motor. The closed end of the housing has a through hole, which is corresponding to the first annular groove. The pressing rod passes through the through hole into the interior of the housing and slides in cooperation with the first annular groove.

9. The wind turbine tower bolt pre-tightening device according to claim 8, characterized in that, The turntable is also provided with a second annular groove on the side facing the drive motor, and also includes a reset mechanism. The reset mechanism includes a mounting cylinder, a sliding rod, and a second elastic element. The mounting cylinder is fixed along the axial direction of the housing to the inner wall of the closed end of the housing. One end of the sliding rod is inserted into the mounting cylinder and connected to the mounting cylinder through the second elastic element. The other end of the sliding rod is slidably engaged with the second annular groove.

10. The wind turbine generator tower bolt pre-tightening device according to claim 1, characterized in that, A handle is provided on the outer surface of the closed end of the housing.

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