Intelligent stretching device for wind power variable pitch bearing

Abstract

The utility model relates to an intelligent stretching device for wind power variable pitch bearing, contain X axis linear module, stretching module and pre -stretching module, X axis linear module is double slide platform linear module, and two slide platforms symmetrically set up on linear module, and simultaneously approach or far away under linear module drive, stretching module and pre -stretching module set up on two slide platforms respectively, all include the Z axis linear module of vertical placement, stretching module still include intelligent stretcher, the visual positioning module for identifying bolt position on variable pitch bearing, pre -stretching module still include nut tightener, the utility model not only can realize automatic stretching and lock through stretching module, reduce the labor intensity, improve work efficiency, and still increase to have pre -stretching module, can ensure the nut on variable pitch bearing to be in the tightening state before stretching lock, avoid the failure of pull rod and bolt alignment because of the nut loosening, and the automation degree is high.

Description

Technical Field

[0001] This utility model relates to the field of wind turbine manufacturing technology, and specifically to an intelligent tensioning device for wind turbine pitch bearings. Background Technology

[0002] As the core load-bearing component of a wind turbine generator, the wind turbine hub plays a crucial role in connecting the blades, main shaft, and nacelle. Its structural reliability directly affects the safe operation of the unit under complex conditions such as strong winds and vibrations. During the assembly of the hub and pitch bearing, the bolt tensioning process is a critical step in ensuring uniform preload at the connection interface. Its precision directly impacts the stress distribution and fatigue resistance of the bearing mating surfaces. Traditional manual tensioning methods suffer from uneven preload and low efficiency, while existing solutions using auxiliary tooling still have significant limitations.

[0003] Taking the existing technology CN202411544552.9 as an example, the pitch bearing connecting bolt tensioning fixture disclosed therein, through a combination structure of a support frame, a rotating beam, and a tensioner bracket, can support the tensioner. Although this reduces the labor intensity of manual lifting to some extent, the existing technology is highly dependent on manual operation, requiring manual completion of multiple operations such as aligning the tensioner with the bolt and tightening the nut. Specifically, the operator needs to manually drive the tensioner to connect the tie rod and the bolt, and after tensioning, the nut needs to be manually tightened. This high-intensity repetitive labor not only significantly reduces assembly efficiency but also easily leads to increased dispersion of preload due to human error, making it difficult to meet the stringent requirements of uniform preload for bolt groups in large wind turbine units. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide an intelligent tensioning device for wind turbine pitch bearings.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: an intelligent stretching device for wind turbine pitch bearings, comprising an X-axis linear module, a stretching module, and a pre-stretching module;

[0006] The X-axis linear module is horizontally positioned; the X-axis linear module is a dual-slide linear module, wherein the two slides are symmetrically arranged on the linear module and move closer or further apart simultaneously under the drive of the linear module.

[0007] The stretching module and the pre-stretching module are respectively set on two slides, each including a vertically placed Z-axis linear module, a quick-change mechanism set on the drive end of the Z-axis linear module, and a floating mechanism set on the quick-change module.

[0008] The stretching module also includes an intelligent stretcher vertically mounted on the floating mechanism and a visual positioning module for identifying the position of bolts on the pitch bearing.

[0009] The pre-stretching module also includes a nut tightener that is vertically mounted on the floating mechanism.

[0010] Preferably, the floating mechanism includes a vertically placed floating seat, cantilever floating assemblies respectively disposed on both sides of the top of the floating seat, and a rotating support assembly disposed on the floating seat and located below the cantilever floating assemblies.

[0011] Preferably, the cantilever floating assembly includes a guide rod placed perpendicular to the floating seat, a slider slidably disposed on the guide rod, and floating springs sleeved on the guide rod and located on both sides of the slider; the inner end of the guide rod is movably connected to the floating seat through a rod end fisheye bearing, and the outer end is provided with a threaded limit end cap; the upper two sides of the intelligent tensioner or nut tightener are respectively connected to the slider.

[0012] Preferably, the rotating support assembly is a hinge structure, with one end rotatably connected to the floating seat and the other end connected to the lower part of the intelligent tensioner or nut tightener via fasteners.

[0013] Preferably, the cantilever floating assembly further includes a connecting seat and a limiting block; the connecting seat is used to connect the rod end fisheye bearing and the floating seat; the limiting block is installed on the connecting seat and forms a limiting hole between the limiting block and the connecting seat; the diameter of the limiting hole is slightly larger than the rod diameter of the rod end fisheye bearing, so that the guide rod can only rotate and swing within the range of motion of the rod end fisheye bearing.

[0014] Preferably, the Z-axis linear module includes a main slide and a driven slide, wherein the main slide is driven by the linear module, and the driven slide is connected to the main slide through an elastic element;

[0015] The quick-change mechanism is used to connect the driven slide and the floating seat.

[0016] Preferably, the quick-change mechanism includes a main quick-change seat vertically arranged on the driven slide and a secondary quick-change seat arranged on the back of the floating seat; the main quick-change seat and the secondary quick-change seat are quickly connected by a dovetail groove structure.

[0017] Preferably, the bottom of the main quick-change seat is provided with a limiting plate to prevent the secondary quick-change seat from falling off the main quick-change seat; the side of the secondary quick-change seat is provided with a set screw for abutting against the main quick-change seat.

[0018] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0019] 1. This utility model can not only achieve automatic stretching and locking through the stretching module, reducing labor intensity and improving work efficiency, but also adds a pre-stretching module, which can ensure that the nut on the pitch bearing is in a tightened state before stretching and locking, avoiding the failure of the tie rod and bolt alignment due to loose nut, and has a high degree of automation.

[0020] 2. The present invention is equipped with a floating mechanism, which enables the intelligent tensioner to float axially and swing slightly. It can automatically correct its posture at the moment when the intelligent tensioner contacts the bolt axially, and achieve self-alignment. Compared with the rigid connection method, this design can greatly improve the thread engagement power of the tie rod and the bolt, and effectively avoid thread engagement damage.

[0021] 3. The present invention is equipped with a quick-change mechanism, which facilitates the rapid replacement of the tension module according to different pitch bearing bolts, so as to achieve "one machine with multiple specifications" compatibility;

[0022] 4. The present invention is equipped with a vision detection module, which can automatically identify the position of the bolts on the pitch bearing, making it easy to drive the intelligent tensioner to align with the bolts to be tensioned, and achieving a high degree of automation. Attached Figure Description

[0023] The technical solution of this utility model will be further described below with reference to the accompanying drawings:

[0024] Appendix Figure 1 This is a schematic diagram of the intelligent tensioning device for wind turbine pitch bearings described in this utility model.

[0025] Appendix Figure 2 This is a schematic diagram of the floating mechanism in this utility model;

[0026] Appendix Figure 3 This is a schematic diagram of the cantilever floating assembly in this utility model;

[0027] Appendix Figure 4 This is a schematic diagram of the quick-change mechanism in this utility model;

[0028] Appendix Figure 5 This is a schematic diagram of the bottom view structure of the stretching module in this utility model.

[0029] The components include: 1. X-axis linear module; 11. Slide table; 2. Tensioning module; 21. Z-axis linear module; 211. Main slide table; 212. Driven slide table; 213. Elastic element; 22. Quick change mechanism; 221. Main quick change seat; 222. Driven quick change seat; 223. Set screw; 224. Limiting plate; 23. Floating mechanism; 231. Floating seat; 232. Cantilever floating assembly; 2321. Guide rod; 2322. Slider; 2323. Floating spring; 2324. Rod end fisheye bearing; 2325. Limiting end cap; 2326. Connecting seat; 2327. Limiting block; 233. Rotary support assembly; 2331. Clamp; 24. Intelligent tensioner; 25. Visual positioning module; 3. Pre-tensioning module; 31. Nut tightener. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0031] Appendix Figure 1 The intelligent stretching device for wind turbine pitch bearings described in this utility model includes an X-axis linear module 1, a stretching module 2, and a pre-stretching module 3.

[0032] The X-axis linear module 1 is horizontally arranged; the X-axis linear module 1 is a dual-slide linear module, wherein two slides 11 are symmetrically arranged on the linear module and move closer or further away from each other simultaneously under the drive of the linear module.

[0033] The stretching module 2 and the pre-stretching module 3 are respectively mounted on two slide tables 11, each including a vertically placed Z-axis linear module 21, a quick-change mechanism 22 mounted on the drive end of the Z-axis linear module 21, and a floating mechanism 23 mounted on the quick-change module.

[0034] The stretching module 2 also includes an intelligent stretcher 24 vertically mounted on the floating mechanism 23 and a visual positioning module 25 for identifying the position of bolts on the pitch bearing.

[0035] The pre-stretching module 3 also includes a nut tightener 31 vertically mounted on the floating mechanism 23;

[0036] During installation: Install this device onto the robotic arm or the end of the tensioner bracket of the existing technology CN202411544552.9. Then, adjust the distance between the tension module 2 and the pre-tension module 3 through the X-axis linear module 1 so that they are simultaneously located directly above the two bolts on the pitch bearing. The tension module 2 and the pre-tension module 3 can be without bolts or with one or more bolts between them, depending on the bolt spacing of the pitch bearing. It is important to ensure that there is no interference between the tension module 2 and the pre-tension module 3.

[0037] During operation: First, the visual positioning module 25 locates the position of a bolt to be stretched on the pitch bearing. Then, the Z-axis linear module 21 of the pre-tensioning module 3 and the tensioning module 2 simultaneously drives the nut tightener 31 and the intelligent tensioner 24 to descend. The nut tightener 31 is used to pre-tighten the nut on the pitch bearing to prevent the nut from being loose during subsequent tensioning, which would cause the tie rod and bolt in the intelligent tensioner 24 to fail to align. The intelligent tensioner 24 is used to automatically stretch and lock the nut after the screw is tightened by the pre-tensioning module 3.

[0038] Furthermore, the intelligent tensioner 24 is existing technology, such as the wind turbine generator hub assembly production line and assembly method disclosed in existing technology CN115890233A, which adds two motors to the traditional tensioner. One motor is used to drive the pull rod to rotate, realizing the connection and disconnection of the pull rod and the bolt; the other motor is used to drive the gear box to automatically lock the nut, eliminating manual operation and improving work efficiency.

[0039] Furthermore, the nut tightener 91 is also existing technology, such as the wind turbine generator hub pitch bearing stud stretching workstation disclosed in prior art CN202411007318.2, which includes an electric wrench for tightening the nut manually. Therefore, the specific structure of its nut tightener 91 will not be described in detail.

[0040] Furthermore, the visual positioning module 25 includes a detection frame and a camera mounted on the detection frame; during operation: the camera collects the position of the bolts on the pitch bearing, thereby driving the intelligent tensioner 24 to align with the bolts and improve the alignment accuracy.

[0041] Furthermore, the camera position can be adjusted horizontally and vertically on the inspection frame, which not only reduces the need for machining precision but also facilitates on-site installation and debugging.

[0042] Furthermore, such as Figure 2 As shown, the floating mechanism 23 includes a vertically placed floating seat 231, cantilever floating components 232 respectively disposed on both sides of the top of the floating seat 231, and a rotary support component 233 disposed on the floating seat 231 and located on the symmetrical line of the two cantilever floating components 232; during operation: through the synergistic effect of the cantilever floating components 232 and the rotary support component 233, multi-degree-of-freedom pose compensation of the intelligent tensioner 24 or the nut tightener 31 is realized.

[0043] Furthermore, such as Figure 3As shown, the cantilever floating assembly 232 includes a guide rod 2321 placed perpendicular to the floating seat 231, a slider 2322 slidably disposed on the guide rod 2321, and floating springs 2323 sleeved on the guide rod 2321 and located on both sides of the slider 2322. The inner end of the guide rod 2321 is movably connected to the floating seat 231 through a rod end fisheye bearing 2324, and the outer end is provided with a threaded limit end cap 2325. The upper two sides of the intelligent tensioner 24 or nut tightener 31 are respectively connected to the slider 2322. During operation: the guide rod 2321 is movably connected to the floating seat 231 through the rod end fisheye bearing 2324, allowing the guide rod 2321 to swing within a certain angle range. In addition, the slider 2322 is slidably disposed on the guide rod 2321, and floating springs 2323 are provided at both ends of the slider 2322, so that the intelligent tensioner 24 or nut tightener 31 can move with multiple degrees of freedom.

[0044] Furthermore, such as Figure 5 As shown, the rotating support assembly 233 is a hinge structure, with one end rotatably connected to the floating seat 231, and the other end connected to the lower part of the intelligent tensioner 24 or the nut tightener 31 via a clamp 2331; the rotation axis of one end of the rotating support assembly 233 and the floating seat 231 is in the radial direction of the pitch bearing, while the rotation axis of the rotating support assembly 233 itself is in the X-axis direction; during operation: the rotating support assembly 233 not only plays a supporting role, but also, through the rotation of the hinge structure combined with the swing of the guide rod 2321 of the cantilever floating assembly 232, allows the intelligent tensioner 24 or the nut tightener 31 to adaptively adjust in the front-back, left-right and tilt directions, realizing multi-dimensional posture correction.

[0045] Furthermore, such as Figure 3 As shown, the cantilever floating assembly 232 also includes a connecting seat 2326 and a limiting block 2327; the connecting seat 2326 is used to connect the rod end fisheye bearing 2324 and the floating seat 231, making its structure more stable; the limiting block 2327 is installed on the connecting seat 2326, and a limiting hole is formed between the limiting block 2327 and the connecting seat 2326; the diameter of the limiting hole is slightly larger than the rod diameter of the rod end fisheye bearing 2324, so that the guide rod 2321 can only rotate and swing within the range of motion of the rod end fisheye bearing 2324, which plays a limiting role and is used to protect the rod end fisheye bearing 2324.

[0046] Furthermore, such as Figure 4As shown, the Z-axis linear module 21 includes a main slide 211 and a driven slide 212. The main slide 211 is driven by the linear module, while the driven slide 212 is not driven by the linear module and is only connected to the main slide 211 through the elastic element 213, and slides with the main slide 211. During operation: when the Z-axis linear module 21 drives the intelligent tensioner 24 or the nut tightener 31 to descend and contact the bolt on the pitch bearing, the elastic element 213 not only plays a buffering role to avoid rigid contact and improve the overall service life, but also enables the intelligent tensioner 24 or the nut tightener 31 to have a floating effect.

[0047] Furthermore, such as Figure 4 As shown, the quick-change mechanism 22 is used to connect the driven slide 212 and the floating seat 231, including a main quick-change seat 221 vertically arranged on the driven slide 212 and a secondary quick-change seat 222 arranged on the back of the floating seat 231; the main quick-change seat 221 and the secondary quick-change seat 222 are quickly connected by a dovetail groove structure; in this embodiment, the main quick-change seat 221 is provided with a vertically placed dovetail protrusion, and the secondary quick-change seat 222 is provided with a dovetail groove corresponding to the dovetail protrusion; when it is necessary to replace the intelligent tensioner 24 or the nut tightener 31 for pitch bearings of different diameters, the dovetail groove on the quick-change seat is fitted onto the dovetail protrusion on the main quick-change seat 221 to achieve quick installation.

[0048] Furthermore, such as Figure 5 As shown, the bottom of the main quick-change seat 221 is provided with a limiting plate 224 to prevent the secondary quick-change seat 222 from falling off the main quick-change seat 221; the side of the secondary quick-change seat 222 is provided with a set screw 223 for abutting against the main quick-change seat 221; this application uses the dual action of the limiting plate 224 and the set screw 223 to fix the secondary quick-change seat 222.

[0049] The above are merely specific application examples of this utility model and do not constitute any limitation on the scope of protection of this utility model. All technical solutions formed by equivalent transformations or equivalent substitutions fall within the scope of protection of this utility model.

Claims

1. An intelligent tensioning device for wind turbine pitch bearings, characterized in that: It includes an X-axis linear module, a stretching module, and a pre-stretching module; The X-axis linear module is horizontally positioned; the X-axis linear module is a dual-slide linear module, wherein the two slides are symmetrically arranged on the linear module and move closer or further apart simultaneously under the drive of the linear module. The stretching module and the pre-stretching module are respectively set on two slides, each including a vertically placed Z-axis linear module, a quick-change mechanism set on the drive end of the Z-axis linear module, and a floating mechanism set on the quick-change module. The stretching module also includes an intelligent stretcher vertically mounted on the floating mechanism and a visual positioning module for identifying the position of bolts on the pitch bearing. The pre-stretching module also includes a nut tightener that is vertically mounted on the floating mechanism.

2. The intelligent tensioning device for wind turbine pitch bearings according to claim 1, characterized in that: The floating mechanism includes a vertically placed floating seat, cantilever floating assemblies respectively disposed on both sides of the top of the floating seat, and a rotating support assembly disposed on the floating seat and located below the cantilever floating assemblies.

3. The intelligent tensioning device for wind turbine pitch bearings according to claim 2, characterized in that: The cantilever floating assembly includes a guide rod placed perpendicular to the floating seat, a slider slidably disposed on the guide rod, and floating springs sleeved on the guide rod and located on both sides of the slider; the inner end of the guide rod is movably connected to the floating seat through a rod end fisheye bearing, and the outer end is provided with a threaded limit end cap; the upper two sides of the intelligent tensioner or nut tightener are respectively connected to the slider.

4. The intelligent tensioning device for wind turbine pitch bearings according to claim 3, characterized in that: The cantilever floating assembly also includes a connecting seat and a limiting block; the connecting seat is used to connect the rod end fisheye bearing and the floating seat; the limiting block is installed on the connecting seat and forms a limiting hole between the limiting block and the connecting seat; the diameter of the limiting hole is slightly larger than the rod diameter of the rod end fisheye bearing, so that the guide rod can only rotate and swing within the range of motion of the rod end fisheye bearing.

5. The intelligent tensioning device for wind turbine pitch bearings according to claim 2, characterized in that: The rotating support assembly is a hinge structure, with one end rotatably connected to the floating seat and the other end connected to the lower part of the intelligent tensioner or nut tightener via fasteners.

6. The intelligent tensioning device for wind turbine pitch bearings according to any one of claims 1-5, characterized in that: The Z-axis linear module includes a main slide and a driven slide, wherein the main slide is driven by the linear module, and the driven slide is connected to the main slide through an elastic element. The quick-change mechanism is used to connect the driven slide and the floating seat.

7. The intelligent tensioning device for wind turbine pitch bearings according to claim 6, characterized in that: The quick-change mechanism includes a main quick-change seat vertically mounted on the driven slide and a secondary quick-change seat mounted on the back of the floating seat; the main quick-change seat and the secondary quick-change seat are quickly connected by a dovetail groove structure.

8. The intelligent tensioning device for wind turbine pitch bearings according to claim 7, characterized in that: The bottom of the main quick-change seat is provided with a limiting plate to prevent the secondary quick-change seat from falling off the main quick-change seat; the side of the secondary quick-change seat is provided with a set screw to abut against the main quick-change seat.

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