Bolt stretching floating structure for wind power variable pitch bearing

Abstract

The invention relates to a bolt stretching and floating structure for a wind power variable pitch bearing. The bolt stretching and floating structure comprises a mounting frame, symmetrically-arranged floating assemblies, a front mounting base, a rear mounting base and an intelligent stretcher. The floating assembly comprises a mounting block, a floating shaft parallel to the intelligent stretcher and a front spring arranged on the floating shaft in a sleeving mode. A tapered hole with a large front end and a small rear end is formed in the mounting block; a tapered block matched with the floating shaft is arranged on the floating shaft; under the action of the front spring, the conical block is initially located at the large end of the conical hole, so that the floating shaft is in a radial suspension state, and automatic posture correction is achieved when the intelligent tensioner makes contact with a bolt; in the butt joint process, the pull rod presses the floating shaft to move, the conical block reaches the rear end of the conical hole to achieve radial positioning, and concentricity is improved; through cooperation of the floating shaft and the conical hole block which are arranged in parallel, the problem that in the prior art, a tensioner inclines due to gravity is fundamentally solved, the self-adaptive floating and rigid locking functions are achieved, and the bolt stretching precision, efficiency and reliability are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind power equipment assembly, in particular to a bolt tensioning floating structure for a wind power variable pitch bearing. BACKGROUND

[0002] The wind power variable pitch system is the core actuator of the wind turbine, and its reliability is directly related to the operation safety and power generation efficiency of the whole machine. As a key component connecting the blade and the hub, the variable pitch bearing is usually fixedly connected with the hub through multiple high-strength pre-tightening bolts. The uniformity of the pre-tightening force of these bolt connections is crucial. If the pre-tightening force is insufficient or unevenly distributed, under complex working conditions such as strong wind, vibration, alternating load, etc., micro-motion wear may easily occur at the connection interface, which may further cause bolt fracture or bearing failure, etc. serious accidents, with high maintenance cost and great safety hidden danger.

[0003] To ensure the accuracy and uniformity of the bolt pre-tightening force, hydraulic bolt tensioners have become the current mainstream fastening tool. By applying pre-tightening force through pure tension, it can effectively overcome the influence of friction coefficient caused by torque method, and the pre-tightening force accuracy is significantly higher than that of hydraulic torque wrench. However, in the narrow space of the wind power hub, it is still a great challenge to efficiently and accurately stretch dozens of bolts distributed in a circle around the variable pitch bearing. The traditional manual carrying and positioning of the tensioner not only has high labor intensity and low operation efficiency, but also cannot guarantee the accurate centering of the tensioner and the bolt, and there is an inherent risk of uneven pre-tightening force.

[0004] To improve the automation level, auxiliary tools or semi-automatic devices are used to carry the bolt tensioner in the industry. For example, the prior art CN202510710293.0 discloses a semi-automatic bolt tensioning device for wind power variable pitch bearing, which is provided with a floating mechanism (including a guide rod, a sliding block, a floating spring and a rod end fish eye bearing) and a rotary support assembly (a hinge structure), so that the intelligent tensioner has certain axial floating and slight swinging capability, so as to realize self-alignment at the moment of contacting with the bolt.

[0005] However, through in-depth analysis and practical verification, the existing technical solution still has the following significant defects:

[0006] 1. Initial attitude inclination caused by gravity: the intelligent tensioner is required to be in a horizontal state when the device is working. Since the guide rod and the intelligent tensioner are arranged approximately vertically, the rear end of the tensioner will sink under the action of its own gravity moment, causing the front end of the tensioner to tilt upward, so that it is already in an inclined attitude before starting to dock. This inherent initial attitude deviation seriously weakens the effect of the self-alignment function, and may even cause the docking to fail.

[0007] 2. Limited concentricity correction capability: the floating mechanism can only provide initial floating compensation. After the tensioner is forced against the bearing end face, there is a lack of effective radial locking or positioning mechanism to finally correct and ensure the high concentricity of the tensioner, pull rod and bolt. Insufficient concentricity will cause the pull rod to bear additional bending stress during the stretching process, not only aggravating the wear of the pull rod and bolt threads, causing the equipment to jam, but also risking accidental breakage of the pull rod or bolt. SUMMARY

[0008] The purpose of the present application is to overcome the shortcomings of the prior art and provide a bolt stretching floating structure for a wind power variable pitch bearing, which can effectively prevent the intelligent tensioner from tilting due to its own gravity, achieve higher precision self-adaptive alignment and rigid locking, and thus improve the quality and efficiency of bolt stretching operation.

[0009] To achieve the above purpose, the technical scheme adopted by the present application is as follows: a bolt stretching floating structure for a wind power variable pitch bearing, comprising a mounting frame, two symmetrically arranged floating assemblies on the mounting frame, a front mounting seat and a rear mounting seat respectively located at the front and rear ends of the two floating assemblies, and an intelligent tensioner located between the two floating assemblies and mounted on the front mounting seat and the rear mounting seat.

[0010] Each of the floating assemblies comprises a mounting block arranged on the mounting frame, at least one floating shaft passing through the mounting block and arranged in parallel with the intelligent tensioner, and a front spring arranged on the floating seat and located between the front mounting seat and the mounting block. The mounting block is provided with at least one tapered hole, the front end of which is large and the rear end of which is small. A tapered block is arranged in the tapered hole on the floating shaft, the length of the tapered block is smaller than the depth of the tapered hole, and the large end diameter of the tapered block is smaller than the large end diameter of the tapered hole and larger than the small end diameter of the tapered hole. The front and rear ends of the floating shaft are connected with the front mounting seat and the rear mounting seat respectively.

[0011] Under the pre-tightening force of the front spring, the initial position of the tapered block is located at the large end of the tapered hole, at which time the floating shaft is in a radially movable suspended state. When the intelligent tensioner is pressed, the floating shaft can move backward against the elastic force of the front spring, so that the tapered block moves to the small end of the tapered hole, realizing radial positioning.

[0012] Preferably, each of the floating assemblies further comprises a rear spring arranged on the floating seat and located between the rear mounting seat and the mounting block. The elastic force of the rear spring is smaller than that of the front spring.

[0013] Preferably, the intelligent tensioner comprises a tensioner main body located between the two floating assemblies and mounted on the front mounting seat, a pull rod driving assembly arranged on the rear mounting seat for driving the pull rod to rotate, and a nut driving assembly arranged on the rear mounting seat for driving the gear box to automatically lock the nut.

[0014] Preferably, the front mounting base includes a C-shaped mounting body, a notch on the mounting body, a pressure strip located at the notch, and bolts on the main body at both ends of the pressure strip to mount the pressure strip; wherein the tensioner body passes through the notch, and the pressure strip presses against the tensioner body by tightening the bolts to achieve radial fixation.

[0015] Preferably, the front mounting base further includes two locking blocks disposed at the front end of the mounting body and located on both sides of the notch; the locking blocks are connected to the mounting body by bolts and are used to lock the step on the surface of the tensioner body to achieve axial positioning of the tensioner.

[0016] Preferably, the pull rod drive assembly includes a pull rod drive reduction motor, a pull rod connecting shaft, and a pull rod spring; the head of the pull rod connecting shaft is provided with a pull rod plug that can be inserted into the end hole of the pull rod; the pull rod drive reduction motor is used to drive the pull rod connecting shaft to rotate the pull rod, thereby connecting and disconnecting the pull rod from the bolt; the pull rod spring is disposed between the pull rod drive reduction motor drive shaft and the pull rod connecting shaft, and is used to drive the pull rod connecting shaft to always maintain connection with the pull rod;

[0017] The nut drive assembly includes a nut drive geared motor, a nut connecting shaft, and a nut spring; the head of the nut connecting shaft is provided with a nut plug that can be inserted into a gearbox socket; the pull rod drive geared motor is used to drive the nut connecting shaft to drive the gearbox to work; the nut spring is disposed between the nut drive geared motor drive shaft and the nut connecting shaft, and is used to drive the nut connecting shaft to maintain a connection with the gearbox.

[0018] Preferably, the pull rod drive assembly further includes an inner sleeve and a limiting shaft; the tail end of the pull rod connecting shaft is provided with a blind hole, and the surface is provided with a limiting hole that is perpendicular to and passes through the blind hole; the limiting hole is elongated and is placed along the axis of the pull rod; one end of the inner sleeve is connected to the drive shaft of the pull rod drive reduction motor, and the other end extends into the blind hole; the limiting shaft passes perpendicularly through the inner sleeve, and both ends are located in the limiting holes respectively; the pull rod spring is sleeved on the inner sleeve and is located between the limiting shaft and the bottom of the blind hole;

[0019] The nut drive assembly further includes a connector; the tail end of the nut connecting shaft is provided with a flattened portion; the flattened portion is provided with an elongated hole placed along the axis of the pull rod; one end of the connector is connected to the drive shaft of the nut drive reduction motor, and the other end is provided with a slot; the flattened portion is located in the slot; the connector is provided with a limiting pin passing through the elongated hole; the nut spring is located in the slot.

[0020] Preferably, the mounting frame is U-shaped and includes a base and side plates located on both sides of the base; reinforcing ribs are also provided between the base and the side plates on both sides; the two sets of floating components are respectively arranged inside the two side plates.

[0021] Preferably, it also includes a vision module; the vision module includes a bracket mounted on two side plates, a camera and a ring light source respectively mounted on the bracket.

[0022] Preferably, it also includes a linear module placed parallel to the intelligent stretcher; the linear module includes a main slide and a driven slide, wherein the main slide is driven by the linear module, while the driven slide is not driven by the linear module, but is only connected to the main slide through an elastic element and slides with the main slide; the base is mounted on the driven slide.

[0023] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0024] 1. Fundamentally solves the tilting problem: By arranging the floating shaft parallel to the intelligent tensioner, the tilting torque caused by gravity is eliminated, ensuring that the intelligent tensioner is initially in a horizontal position, which greatly improves the starting accuracy of self-alignment.

[0025] 2. Intelligent floating-locking conversion: Utilizing the unique combination of conical holes, conical blocks, and springs, a dynamic process is achieved from "large-range floating alignment in the initial state" to "gradually decreasing floating amount during docking" to "rigid locking during final operation". This is more advanced than simple floating or simple rigid support, ensuring both alignment tolerance and rigidity and concentricity during operation.

[0026] 3. High reliability and long lifespan: The dual-spring (front and rear springs) design effectively solves the rebound impact problem; the elastic connection design of the drive shaft avoids hard collisions; the two-stage buffer mechanism of the linear module further protects the equipment;

[0027] 4. High efficiency and easy maintenance: The vision module enables automatic positioning; the modular quick-release design makes the assembly and disassembly of the intelligent tensioner very simple, greatly facilitating inspection and maintenance work.

[0028] 5. Overall performance improvement: Combining the above advantages, this structure significantly improves the preload accuracy of bolt tensioning, operational efficiency, and equipment reliability, making it suitable for the high standards required in the wind power sector. Attached Figure Description

[0029] The technical solution of the present invention will be further described below with reference to the accompanying drawings:

[0030] Appendix Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0031] Appendix Figure 2 This is a schematic diagram of the structure of the two floating components and the front and rear mounting bases in this invention;

[0032] Appendix Figure 3 for Figure 2A horizontal cross-sectional view of the initial floating state;

[0033] Appendix Figure 4 for Figure 2 A horizontal sectional view of the final locked state;

[0034] Appendix Figure 5 This is a partial cross-sectional view of the present invention;

[0035] Appendix Figure 6 This is a schematic diagram of the structure of the pull rod drive assembly and the nut drive assembly mounted on the rear mounting base in this invention;

[0036] Appendix Figure 7 This is a cross-sectional view of the pull rod drive assembly in this invention;

[0037] Appendix Figure 8 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0038] Appendix Figure 9 This is a schematic diagram of the structure of the tensioner after the main body of the present invention has been removed;

[0039] Appendix Figure 10 This is another visual structural diagram of the bolt-stretched floating structure for wind turbine pitch bearings described in this invention.

[0040] The components include: 1. Mounting bracket; 11. Base; 12. Side plate; 13. Reinforcing rib; 2. Floating assembly; 21. Mounting block; 211. Tapered hole; 22. Floating shaft; 221. Tapered block; 23. Front spring; 24. Rear spring; 3. Front mounting seat; 31. Mounting body; 32. Notch; 33. Pressure strip; 34. Bolt; 35. Clamping block; 4. Rear mounting seat; 41. Positioning groove; 5. Intelligent tensioner; 51. Tensioner body; 52. Pull rod drive assembly; 521. Pull rod drive geared motor; 522. Pull rod connecting shaft; 523. Pull rod spring. 524. Pull rod plug; 525. Inner sleeve; 526. Limiting shaft; 527. Blind hole; 528. Limiting hole; 53. Nut drive assembly; 531. Nut drive geared motor; 532. Nut connecting shaft; 533. Nut plug; 534. Connector; 535. Long hole; 536. Slot; 537. Limiting pin; 6. Vision module; 61. Bracket; 62. Camera; 63. Ring light source; 7. Linear module; 71. Main slide; 72. Driven slide; 73. Elastic element; 731. Elastic frame; 732. Guide post; 733. Buffer spring. Detailed Implementation

[0041] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0042] Example 1:

[0043] AppendixFigure 1 The bolt tensioning floating structure for wind turbine pitch bearings described in this invention includes a mounting frame 1, two floating components 2 symmetrically arranged on the mounting frame 1, a front mounting seat 3 and a rear mounting seat 4 located at the front and rear ends of the two floating components 2 respectively, and an intelligent tensioner 5 located between the two floating components 2 and installed on the front mounting seat 3 and the rear mounting seat 4.

[0044] like Figure 4 As shown, each floating assembly 2 includes a mounting block 21 mounted on the mounting frame 1, a floating shaft 22 passing through the mounting block 21 and placed parallel to the intelligent tensioner 5, and a front spring 23 sleeved on the floating seat and located between the front mounting seat 3 and the mounting block 21. The mounting block 21 has a conical hole 211 with a larger front end and a smaller rear end. The floating shaft 22 has a conical block 221 inside the conical hole 211, the length of which is less than the depth of the conical hole 211, and the diameter of the large end of the conical block 221 is smaller than the diameter of the large end of the conical hole 211 but larger than the diameter of the small end of the conical hole 211. The front and rear ends of the floating shaft 22 are connected to the front mounting seat 3 and the rear mounting seat 4, respectively.

[0045] like Figure 3 As shown, under the action of the front spring 23, the tapered block 221 is initially located at the front end (large end) of the tapered hole 211. Due to the gap, the floating shaft 22 is in a radially movable "suspended" state, allowing the intelligent tensioner 5 to automatically correct its posture the instant it contacts the bolt. During the docking process, the tie rod will press the floating shaft 22 against the elastic force of the front spring 23 and move it towards the rear end of the tapered hole 211, gradually reducing the radial range of motion and playing a guiding and initial positioning role. When the intelligent tensioner 5 is fully pressed against the end face of the wind turbine pitch bearing, as... Figure 4 As shown, the tapered block 221 on the floating shaft 22 is located at the rear end (small end) of the tapered hole 211. Since the large end diameter of the tapered block 221 is larger than the small end diameter of the tapered hole 211, precise radial positioning is achieved, the position of the bolt is finally corrected, the concentricity accuracy is significantly improved, and tension jamming or bolt deformation is avoided.

[0046] Since the floating shaft 22 is placed parallel to the intelligent tensioner 5, and the center of gravity of the intelligent tensioner 5 is set between the two floating components 2, its gravity will not generate a torque that causes its two ends to tilt, thus fundamentally avoiding the phenomenon of its front end tilting or sinking in a horizontal state, resulting in a better initial alignment effect; especially after stretching, when the tie rod is separated from the bolt, due to the loss of the external force of compression, under the action of the front spring 23, the conical block 221 is located at the front end of the conical hole 211, at which time the floating shaft 22 is in a suspended rotation state, making it easier for the intelligent tensioner 5 to separate from the tie rod.

[0047] Furthermore, such as Figure 4As shown, each set of floating components 2 also includes a rear spring 24 sleeved on the floating seat and located between the rear mounting seat 4 and the mounting block 21; the elastic force of the rear spring 24 is less than that of the front spring 23; the design of the rear spring 24 not only helps to improve the floating effect, but more importantly, after the stretching is completed and the external force is removed, it can work together with the front spring 23 to provide a buffer force, so as to avoid the cone block 221 and the end cap at the front end of the cone hole 211 from violently colliding under the elastic force of the front spring 23 after the external force is lost, thereby protecting the equipment and preventing the intelligent stretcher 5 from generating impact force that causes the internal parts to loosen.

[0048] Furthermore, such as Figure 5 As shown, the intelligent tensioner 5 includes a tensioner body 51 located between two floating components 2 and mounted on a front mounting base 3, a pull rod drive assembly 52 mounted on a rear mounting base 4 for driving the pull rod to rotate, and a nut drive assembly 53 mounted on a rear mounting base 4 for driving the gear box to automatically lock the nut.

[0049] Furthermore, such as Figure 2 As shown, the front mounting base 3 includes a C-shaped mounting body 31, a notch 32 on the mounting body 31, a pressure strip 33 located at the notch 32, and bolts 34 on the main body at both ends of the pressure strip 33 to mount the pressure strip 33; wherein the tensioner body 51 passes through the notch 32, and the pressure strip 33 presses against the tensioner body 51 by tightening the bolts 34 to achieve radial fixation; the front mounting base 3 also includes two locking blocks 35 located at the front end of the mounting body 31 and on both sides of the notch 32; the locking blocks 35 are connected to the mounting body 31 by bolts 34 and are used to lock the surface steps of the tensioner body 51 to achieve axial positioning of the tensioner.

[0050] Furthermore, such as Figure 6 As shown, the pull rod drive assembly 52 includes a pull rod drive reduction motor 521, a pull rod connecting shaft 522, and a pull rod spring 523. The head of the pull rod connecting shaft 522 is provided with a pull rod plug 524 that can be inserted into the end socket of the pull rod. The pull rod drive reduction motor 521 drives the pull rod connecting shaft 522 to rotate the pull rod, thereby connecting and disconnecting the pull rod from the bolt. The pull rod spring 523 is disposed between the drive shaft of the pull rod drive reduction motor 521 and the pull rod connecting shaft 522, providing a continuous elastic preload to ensure the pull rod connecting shaft 522 remains connected to the pull rod and prevents disconnection. The pull rod plug 524 is not circular; its shape corresponds to the end socket of the pull rod. In this embodiment, the cross-section of the pull rod plug 524 is square.

[0051] Furthermore, such as Figure 6As shown, the nut drive assembly 53 includes a nut drive reduction motor 531, a nut connecting shaft 532, and a nut spring; the head of the nut connecting shaft 532 is provided with a nut plug 533 that can be inserted into the gearbox socket; the pull rod drive reduction motor 521 is used to drive the nut connecting shaft 532 to drive the gearbox to work; the nut spring is disposed between the drive shaft of the nut drive reduction motor 531 and the nut connecting shaft 532 to provide a continuous elastic preload force, driving the nut connecting shaft 532 to remain connected to the gearbox and avoid disengagement; wherein the pull rod plug 524 is not circular, and its shape corresponds to the socket at the end of the pull rod. In this embodiment, the cross-section of the pull rod plug 524 is square.

[0052] This application utilizes a combined design of the front mounting base 3, the pull rod drive assembly 52, and the nut drive assembly 53 to facilitate quick disassembly and assembly of the tensioner body 51 for inspection and maintenance. The disassembly process is as follows: Since both the pull rod connecting shaft 522 and the nut connecting shaft 532 are connected to the insertion holes of the tensioner body 51 via plugs, loosening the bolts removes the two locking blocks 35 that hold the surface steps of the tensioner body 51. Then, loosening the bolts loosens the pressure strip 33, allowing the tensioner body 51 to be removed directly – a very quick and convenient process. The installation process is as follows: Pass the tensioner body 51 through the notch 32 of the mounting body 31, then insert the plugs of the pull rod connecting shaft 522 and the nut connecting shaft 532 into the corresponding insertion holes on the tensioner body 51. The two locking blocks 35 then hold the surface steps of the tensioner body 51 in place, achieving axial positioning and ensuring that the connecting shafts remain connected to the tensioner body 51 under the action of the springs, preventing separation. Finally, the pressure strip 33 is tightened with bolts for radial fixation, also quick and convenient.

[0053] Furthermore, such as Figure 6 As shown, the rear mounting base 4 is provided with a positioning groove 41; the rear end of the tensioner body 51 is located in the positioning groove 41. The positioning groove 41 on the mounting base 4 and the pressure strip 33 on the front mounting base 3 achieve dual radial positioning, making the tensioner body 51 more stable after installation.

[0054] Furthermore, such as Figure 7As shown, the pull rod drive assembly 52 further includes an inner sleeve 525 and a limiting shaft 526; the tail end of the pull rod connecting shaft 522 is provided with a blind hole 527, and the surface is provided with a limiting hole 528 that is perpendicular to and passes through the blind hole 527; the limiting hole 528 is elongated and placed along the axis of the pull rod; one end of the inner sleeve 525 is connected to the drive shaft of the pull rod drive reduction motor 521, and the other end extends into the blind hole 527; the limiting shaft 526 passes perpendicularly through the inner sleeve 525, and both ends are located in the limiting hole 528 respectively; the pull rod spring 523 is sleeved on the inner sleeve 525 and located between the limiting shaft 526 and the bottom of the blind hole 527; the present invention, through the cooperation of the blind hole 527, the limiting hole 528 and the limiting shaft 526, achieves axial elastic connection while ensuring the reliability of circumferential transmission.

[0055] Furthermore, such as Figure 6 As shown, the nut drive assembly 53 further includes a connector 534; the tail end of the nut connecting shaft 532 is provided with a flattened portion; the flattened portion is provided with an elongated hole 535 placed along the axis of the pull rod; one end of the connector 534 is connected to the drive shaft of the nut drive reduction motor 531, and the other end is provided with a slot 536; the flattened portion is located in the slot 536; the connector 534 is provided with a limiting pin 537 passing through the elongated hole 535; the nut spring is located in the slot 536; the present invention, through the cooperation of the slot 536, the elongated hole 535 and the limiting pin 537, achieves axial elastic connection while ensuring the reliability of circumferential transmission.

[0056] Furthermore, such as Figure 9 As shown, the mounting frame 1 is U-shaped and includes a base 11 and side plates 12 located on both sides of the base 11. Reinforcing ribs 13 are also provided between the base 11 and the side plates 12 on both sides. The two sets of floating components 2 are respectively arranged inside the two side plates 12, making the overall structure more stable.

[0057] Furthermore, the tensioner body 51 is existing technology, such as the multi-stage ultra-high pressure thin-walled hydraulic tensioner for the main bolts of wind turbine hubs with authorization announcement number CN207431702U, which has already described the specific structure of the tensioner in detail, so this application will not describe it in detail.

[0058] Example 2:

[0059] The difference from Example 1 is as follows: Figure 8 As shown, each set of floating components 2 has two floating shafts 22, which are distributed vertically; the mounting block 21 also has two corresponding tapered holes 211; compared with only one floating shaft 22 in Embodiment 1, not only is the connection strength with the front mounting base 3 and the rear mounting base 4 higher, but the overall floating stability is also better.

[0060] Example 3:

[0061] Based on Example 1 or Example 2, such as Figure 9 As shown, it also includes a vision module 6; the vision module 6 includes a bracket 61 mounted on two side plates 12, a camera 62 and a ring light source 63 respectively mounted on the bracket 61, for identifying and locating the bolt position to achieve automated operation.

[0062] Example 4:

[0063] Based on any one of Examples 1 to 3, such as Figure 5 As shown, it also includes a linear module 7 placed parallel to the intelligent tensioner 5; the linear module 7 includes a main slide 71 and a driven slide 72, wherein the main slide 71 is driven by the screw of the linear module 7, while the driven slide 72 is not driven by the linear module 7, but is only connected to the main slide 71 through the elastic element 73 and slides with the main slide 71; the base 11 is installed on the driven slide 72; when the linear module 7 drives the intelligent tensioner 5 to contact the bolt on the pitch bearing, the elastic element 73 plays a secondary buffering role to avoid rigid contact and improve the overall service life.

[0064] Furthermore, such as Figure 10 As shown, the elastic element 73 includes an elastic frame 731 mounted on the main slide table 71, a guide post 732 that passes horizontally through the elastic frame 731 and is threadedly connected to the mounting frame 1, and a buffer spring 733 that is sleeved on the guide post 732 and located between the elastic frame 731 and the base 11. During operation: since the guide post 732 passes through the elastic frame 731 and is threadedly connected to the base 11, it serves to connect the elastic frame 731 and the mounting frame 1. The buffer spring 733 is provided on the guide post 732 between the elastic frame 731 and the mounting frame 1. When the linear module 7 drives the intelligent tensioner 5 to contact the bolt on the pitch bearing, the guide post 732 can slide along the elastic frame 731. At this time, the buffer spring 733 plays a buffering role.

[0065] During operation: the camera 62 of the vision module 6 identifies the position of the bolt on the pitch bearing; the linear module 7 drives the main slide 71 forward, which in turn pushes the driven slide 72 and the entire floating structure toward the bolt through the elastic element 73; at the moment of contact, if there is a deviation, since the initial position of the conical block 221 is located at the large end of the conical hole 211 under the action of the front spring 23, there is ample space, allowing the floating shaft 22 to move radially, thereby achieving self-alignment;

[0066] After alignment, the linear module 7 continues to advance, the bolt will press against the pull rod, and the reaction force will force the entire floating mechanism to move backward against the elastic force of the front spring 23. The conical block 221 gradually moves towards the small end of the conical hole 211, the radial clearance gradually decreases, and the guiding effect is enhanced until the intelligent tensioner 5 completely abuts against the bearing end face, the conical block 221 enters the small end of the conical hole 211, achieving radial locking and ensuring extremely high concentricity; then, the pull rod drive assembly 52 works, and the pull rod is screwed to engage with the bolt, so that the tensioning operation can be performed; at the same time, the nut drive assembly 53 works, driving the gearbox to lock the nut;

[0067] After the operation is completed, each drive reverses and the linear module 7 moves backward; under the synergistic buffering effect of the front spring 23 and the rear spring 24, the conical block 221 smoothly returns to the large end of the conical hole 211 and resumes its floating state.

[0068] The above are merely specific application examples of the present invention and do not constitute any limitation on the scope of protection of the present invention. All technical solutions formed by equivalent transformations or substitutions fall within the scope of protection of the present invention.

Claims

1. A bolt stretch float structure for a wind turbine variable pitch bearing, characterized by: The intelligent stretcher comprises a mounting frame, two symmetrical floating assemblies arranged on the mounting frame, a front mounting base and a rear mounting base respectively arranged at the front and rear ends of the two floating assemblies, and an intelligent stretcher body arranged between the two floating assemblies and mounted on the front mounting base and the rear mounting base. Each of the floating assemblies comprises a mounting block arranged on the mounting frame, at least one floating shaft arranged through the mounting block and parallel to the intelligent stretcher body, and a front spring arranged on the floating block and between the front mounting base and the mounting block. The mounting block is provided with at least one tapered hole, the front end of the tapered hole is large, and the rear end of the tapered hole is small.

2. The bolt stretch float structure for a wind power variable pitch bearing of claim 1, wherein: The floating shaft is provided with a tapered block in the tapered hole, the length of the tapered block is smaller than the depth of the tapered hole, the large end diameter of the tapered block is smaller than the large end diameter of the tapered hole, and larger than the small end diameter of the tapered hole.

3. The bolt stretch float structure for a wind power variable pitch bearing of claim 1, wherein: Under the pre-tightening force of the front spring, the initial position of the tapered block is located at the large end of the tapered hole, and the floating shaft is in a radial movable suspended state.

4. The bolt stretch float structure for a wind power variable pitch bearing of claim 3, wherein: When the intelligent stretcher body is pressed, the floating shaft can move backward to make the tapered block move to the small end of the tapered hole to realize radial positioning.

5. The bolt stretch float structure for a wind power variable pitch bearing of claim 4, wherein: Each of the floating assemblies further comprises a rear spring arranged on the floating block and between the rear mounting base and the mounting block.

6. The bolt tension float structure for a wind power variable pitch bearing of claim 3, wherein: The rear spring has a smaller elastic force than the front spring. The intelligent stretcher body comprises a stretcher body arranged between the two floating assemblies and mounted on the front mounting base, a pull rod driving assembly arranged on the rear mounting base and used for driving the pull rod to rotate, and a nut driving assembly arranged on the rear mounting base and used for driving the gear box to automatically lock the nut. The front mounting base comprises a C-shaped mounting body, a notch arranged on the mounting body, a pressing strip arranged at the notch, and bolts arranged at both ends of the pressing strip and used for mounting the pressing strip on the mounting body. The stretcher body passes through the notch, the pressing strip is pressed against the stretcher body by rotating the bolts, and radial fixing is realized. The front mounting base further comprises two clamping blocks arranged at the front end of the mounting body and located at both sides of the notch. The clamping blocks are connected with the mounting body by bolts and used for clamping the surface step of the stretcher body to realize axial positioning of the stretcher body. The pull rod driving assembly comprises a pull rod driving reduction motor, a pull rod connecting shaft, and a pull rod spring. The head of the pull rod connecting shaft is provided with a pull rod plug which can be inserted into the end hole of the pull rod. The pull rod driving reduction motor is used for driving the pull rod connecting shaft to rotate the pull rod to realize connection and disconnection of the pull rod and the bolt. The nut driving assembly comprises a nut driving reduction motor, a nut connecting shaft, and a nut spring. The head of the nut connecting shaft is provided with a nut plug which can be inserted into the gear box hole. The pull rod driving reduction motor is used for driving the nut connecting shaft to drive the gear box to work. The nut spring is arranged between the driving shaft of the nut driving reduction motor and the nut connecting shaft and used for driving the nut connecting shaft to always keep connection with the gear box.

7. The bolt stretch float structure for a wind power variable pitch bearing of claim 6, wherein: The pull rod driving assembly further comprises an inner sleeve and a limiting shaft; the tail end of the pull rod connecting shaft is provided with a blind hole, and the surface is provided with a limiting hole which is vertically placed and penetrates the blind hole; the limiting hole is long strip-shaped and is placed along the pull rod axis direction; one end of the inner sleeve is connected with the driving shaft of the pull rod driving reduction motor, and the other end extends into the blind hole; the limiting shaft vertically penetrates the inner sleeve, and both ends are located in the limiting hole respectively; the pull rod spring is sleeved on the inner sleeve and is located between the limiting shaft and the bottom of the blind hole. The nut driving assembly further comprises a connecting piece; the tail end of the nut connecting shaft is provided with a flat portion; the flat portion is provided with a long strip hole which is placed along the pull rod axis direction; one end of the connecting piece is connected with the driving shaft of the nut driving reduction motor, and the other end is provided with a clamping groove; the flat portion is located in the clamping groove; the connecting piece is provided with a limiting pin which penetrates the long strip hole; the nut spring is located in the clamping groove.

8. The bolt tension float structure for a wind power variable pitch bearing according to any one of claims 1-7, characterized in that: The mounting frame is U-shaped, comprising a base and side plates located on both sides of the base respectively; the base and the side plates on both sides are further provided with reinforcing ribs; two groups of floating assemblies are arranged on the inner sides of the two side plates respectively.

9. The bolt tension float structure for a wind power variable pitch bearing according to any one of claims 1-7, characterized in that: Further comprising a visual module; the visual module comprises a bracket mounted on the mounting frame, a camera and a ring-shaped light source arranged on the bracket respectively.

10. The bolt tension float structure for a wind power variable pitch bearing according to any one of claims 1-7, characterized in that: Further comprising a straight line module which is placed in parallel with the intelligent stretcher; the straight line module comprises a main sliding table and a driven sliding table, wherein the main sliding table is driven by the straight line module, and the driven sliding table is not driven by the straight line module, but is connected with the main sliding table only by an elastic member and slides following the main sliding table; the mounting frame is mounted on the driven sliding table.

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