Wind turbine variable pitch structure and method of use

Abstract

This invention discloses a wind turbine pitch structure and its usage method, including a hub housing, comprising a main housing and a cover mounted on the main housing. Multiple blades are detachably and evenly distributed in a ring on the outer side of the main housing. The structure also includes: rotating components, each comprising a rotating gear rotatably connected to the inner wall of the hub housing; a frame fixedly mounted inside the main housing, with locking components evenly distributed on the frame, and a controller mounted on the frame; and a circulating oil injection system, mounted on the frame, comprising an oil injection head and an oil receiving box, respectively positioned on opposite sides of the rotating gears. The rotating gears are mechanically locked by the locking components, and combined with the rigid support of the pitch bearings, can withstand the impact force of 12-level gusts on the blades, preventing angular deviation. The circulating oil injection and cleaning system extends the lifespan of the transmission components.

Description

Technical Field

[0001] This invention relates to the field of wind turbine pitch structure technology, and in particular to a wind turbine pitch structure and its usage method. Background Technology

[0002] The pitch control system of a wind turbine is a core component ensuring the efficient and stable operation of the unit. It adjusts the blade angle to adapt to different wind speeds, increasing the angle of attack at low wind speeds to improve wind energy capture efficiency, and decreasing the angle of attack at high wind speeds to limit power output and prevent unit overload. As wind turbine capacity increases to 3MW and above, blade length and weight have significantly increased, placing higher demands on the transmission accuracy, load capacity, and ease of maintenance of the pitch control structure. Furthermore, existing wind turbine blade pitch control systems have the following shortcomings: Firstly, the lubrication of gear meshing areas mostly adopts open-type oil injection or periodic manual grease replenishment, with a lubricating oil utilization rate of less than 60%. Moreover, dust and metal debris generated by gear wear are easily mixed into the oil, which aggravates abrasive wear on the gear surface and shortens the gear life to less than 8,000 hours. Although some structures are equipped with oil receiving devices, they cannot achieve closed-loop oil circulation, and frequent lubricating oil replacement is still required, resulting in a large amount of maintenance work.

[0003] Secondly, the locking safety and angle control accuracy are insufficient; existing pitch locking systems mostly rely on motor brakes or a single mechanical pin, which have insufficient locking force (≤30kN). Under strong gusts (wind speed ≥25m / s), blade angle deviation is likely to occur; angle control relies on a single encoder feedback and lacks torque monitoring and redundant protection. When the transmission system jams or gears wear, the unit is prone to vibration due to angle loss of control, and may even lead to blade breakage.

[0004] Third, the system has low integration and poor adaptability; the functions of oil injection, cleaning, and locking are mostly set up independently, and the pipeline and wiring layout is messy, increasing the number of failure points; different power levels of the units require redesign of the pitch structure, resulting in poor versatility and high manufacturing costs.

[0005] Solving the aforementioned technical problems requires a comprehensive improvement to the wind turbine pitch structure. Therefore, developing a pitch structure with efficient lubrication, safe locking, and strong adaptability is key to addressing the pain points of existing technologies and improving the operational reliability of wind turbines. In view of this, our company's technical personnel have proposed a wind turbine pitch structure and its usage method as described in this application. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a wind turbine pitch structure and its usage method to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, in a first aspect, this application provides a wind turbine pitch structure, including a hub cover, the hub cover comprising a main cover and a cover mounted on the main cover, wherein multiple blades are detachably and evenly distributed around the outer side of the main cover, and further comprising: Rotating components, a plurality of said rotating components are respectively disposed in the hub cover body, the rotating components are used to drive the corresponding blades to rotate, the rotating components include rotating gears, and the rotating gears are rotatably connected to the inner wall of the hub cover body; The frame is fixedly installed inside the main cover. Locking components are evenly arranged on the frame. The locking components are used to lock the rotating gear in a preset manner. The frame is equipped with a controller. A circulating oil injection component is mounted on the frame. The circulating oil injection component includes an oil injection head and an oil receiving box, which are respectively located on opposite sides of the rotating gear for circulating and collecting lubricating oil.

[0008] Multiple docking seats are fixedly installed on the outer wall of the main cover, and a pitch bearing is fixedly installed at the root of the blade. The outer ring of the pitch bearing is fixedly provided with a mounting flange, and the mounting flange is fixedly connected to the docking seat by bolts.

[0009] The pitch bearing is inserted into the docking seat. The inner ring of the pitch bearing has several docking holes in a circular pattern. One end of the rotating gear inside the rotating component extends and is rotatably engaged inside one end of the docking seat. Several docking rods are fixed in a circular pattern on the rotating gear, and the docking rods are inserted into the docking holes.

[0010] The inner wall of the main cover is uniformly fixed with mounting plates. A rotating component is located on one side of the mounting plate. The rotating component also includes a rotating motor, which is fixedly mounted on the mounting plate. A drive gear is fixedly mounted on the output end of the rotating motor, and the drive gear meshes with the rotating gear for transmission.

[0011] The locking component includes a telescopic mechanism, one end of which passes through the mounting plate. A locking gear is fixedly installed at one end of the telescopic mechanism. A gear groove that mates with the locking gear is provided in the middle of the rotating gear. When the locking gear extends into the gear groove, it locks the rotating gear.

[0012] The telescopic mechanism is a telescopic cylinder. A locking gear is installed at the end of the telescopic rod of the telescopic cylinder. A spline hole is provided on the mounting plate. A spline structure is provided at the end of the telescopic rod of the telescopic cylinder near the locking gear. The spline structure of the telescopic rod passes through the spline hole and is axially slidably engaged with the spline hole.

[0013] The upper end of the frame is fixedly installed with an upper box, and the upper box is equipped with an oil injection circulation pump. The output end of the oil injection circulation pump is connected to multiple oil injection branch pipes through an oil injection pipe. One end of the oil injection branch pipe is connected to an oil injection head set at one end of the rotating gear. The oil injection head is fixedly connected to the mounting plate through a support rod.

[0014] The oil filling head has a slot in the middle, and a dust suction head is installed inside the slot. The dust suction head is connected to a vacuum cleaner through an air duct, and the vacuum cleaner and the oil filling head are fixedly connected to each other.

[0015] An oil receiving pipe is fixedly connected to one end of the oil receiving box at the other end of the rotating gear. An oil suction pump is fixedly connected to the end of the oil receiving pipe. An oil storage box is fixedly installed at the lower end of the frame. The oil suction pump is fixedly installed on the oil storage box. A sieve plate is detachably connected inside the oil storage box. An oil distribution pump is fixedly installed at the lower end of the oil storage box. An oil distribution pipe is fixedly connected to one end of the oil distribution pump. One end of the oil distribution pipe is connected to the upper box.

[0016] A method of using a wind turbine pitch structure, the method of using the wind turbine pitch structure includes the following steps: S1. Installation of blades and hub cover; Insert the outer ring of the pitch bearing at the blade root into the mating seat on the side wall of the main cover, and fix it to the mating seat with bolts by mounting flange to ensure the connection between the blade and the hub cover; The mating rod at one end of the rotating gear is inserted into the mating hole of the inner ring of the pitch bearing to complete the transmission connection between the blade and the rotating component. Close the cover and fix the main cover to the cover with the fastening bolts on the side to form a closed hub space; S2: Initialization of the circulating oil injection system; Fill the oil reservoir with lubricating oil that meets the specifications; Start the oil circulation pump and deliver the oil to the oil head set at one end of the rotating gear through the oil injection pipe and oil injection branch pipe. At the same time, start the oil suction pump so that the oil collected in the oil receiving box flows back to the oil storage box through the oil receiving pipe, thus completing the test of the lubricating oil circulation path. S3: Pitch adjustment operation; Unlock the rotating gear; After receiving the pitch control command, the controller controls the telescopic mechanism in the locking component to retract, causing the locking gear to disengage from the gear groove in the middle of the rotating gear, thus releasing the mechanical lock on the rotating gear. Drive the blades to rotate; When the rotary motor starts, the drive gear at its output end drives the rotary gear to rotate. Through the mating rod and the mating hole of the inner ring of the pitch bearing, the blade is driven to rotate around the pitch bearing, thereby achieving angle adjustment. The controller monitors the blade position in real time according to preset angle parameters. When the target angle is reached, the rotary motor stops working. Locking and fixing; The telescopic mechanism extends, and the locking gear re-engages into the gear groove of the rotating gear, forming a mechanical lock on the rotating gear to prevent the blades from shifting at an angle due to airflow disturbance. S4. Circulating oil injection and cleaning maintenance; Gear lubrication and oil circulation; During pitch adjustment, the oil circulation pump works continuously, and the oil injection head sprays lubricating oil onto the meshing point of the rotating gear and the driving gear to reduce transmission wear. Excess oil dripping from the meshing point is collected in the oil collection box at the other end, and then transported to the oil storage box via the oil collection pipe and oil suction pump. After being filtered by the sieve plate, it is pumped back to the upper box by the oil distribution pump through the oil distribution pipe, thus realizing the recycling of lubricating oil. Clean the meshing area; Before adding oil, start the vacuum cleaner and use the vacuum head in the middle slot of the oiling head to remove metal shavings and dust generated by gear meshing, so as to avoid impurities from mixing into the oil or aggravating gear wear. S5. Anomaly handling and regular maintenance; Emergency lockout; When the controller detects an abnormal pitch angle or a gear transmission failure, it immediately triggers the locking mechanism. The telescopic mechanism quickly extends to lock the rotating gear, preventing the blades from going out of control. Oil changes and component inspections; Regularly check the wear of the tooth surfaces of rotating gears and drive gears to ensure stable performance of the transmission system; Regularly disassemble the screen plate of the oil reservoir, clean the filtered impurities and replace the screen plate with a new one, and replenish the lubricating oil in the oil reservoir. Replace the filter inside the vacuum cleaner regularly.

[0017] Compared with the prior art, the above-conceptual technical solution conceived in this application has the following beneficial effects: 1. Modular and detachable design reduces installation and maintenance difficulty; the blades are connected to the mating seat bolts through the mounting flange of the outer ring of the pitch bearing, realizing quick assembly and disassembly of the blades and hub cover. Compared with the traditional welding or one-piece molding structure, the replacement time of a single blade is shortened by more than 50%. The cover and the main cover are fixed by fastening bolts, and the enclosed space can be quickly opened to facilitate the inspection and maintenance of internal rotating parts and locking parts, reducing downtime for maintenance.

[0018] 2. A dual locking mechanism ensures precise fixation of the pitch angle; the rotating gear is mechanically locked via a locking gear driven by a telescopic mechanism, which, together with the rigid support of the pitch bearing, can withstand the impact force of 12-level gusts on the blades, preventing angle deviation. 3. Circulating oil injection and cleaning system: Extends the life of transmission components; the oil injection head and oil receiving box correspond to each other, and together with the oil injection circulation pump and oil distribution pump, they form a closed-loop system, increasing the lubricating oil utilization rate from 60% in traditional open lubrication to over 90%, reducing lubricating oil consumption by 30% per year. The sieve plate in the oil reservoir filters the returning oil, effectively intercepting metal debris and preventing impurities from entering the gear meshing surface and causing wear, thus extending the service life of rotating gears and drive gears to over 15,000 hours (compared to approximately 8,000 hours in traditional structures). Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 This is a top view of the present invention.

[0022] Figure 3 This is a schematic diagram showing the position of the connecting rod of the present invention.

[0023] Figure 4 This is a schematic diagram of the rotating component of the present invention.

[0024] Figure 5 This is a schematic diagram showing the placement of the oil injection head and the oil receiving box according to the present invention.

[0025] Figure 6 This is a schematic diagram of the internal structure of the main cover of the present invention.

[0026] Figure 7 This is a schematic diagram of the structure of the circulating oil injection component of the present invention.

[0027] Figure 8 for Figure 6 Enlarged view of the structure at point A in the middle.

[0028] Figure 9 for Figure 7 Enlarged view of the structure at point B in the middle.

[0029] Figure 10 This is a schematic diagram of the telescopic mechanism.

[0030] Figure label: 1. Wheel hub cover; 101. Main cover; 102. Cover; 103. Fastening bolts; 2. Leaves; 3. Rotating component; 301. Rotary gear; 302. Rotary motor; 303. Drive gear; 4. Rack; 5. Locking component; 501. Telescopic mechanism; 502. Locking gear; 6. Controller; 7. Circulating oil filling components; 701. Oil filling head; 702. Oil receiving box; 703. Upper box; 704. Oil filling circulation pump; 705. Oil filling pipe; 706. Oil filling branch pipe; 707. Support rod; 708. Oil receiving pipe; 709. Oil suction pump; 710. Oil reservoir; 711. Screen plate; 712. Oil distribution pump; 713. Oil distribution pipe; 714. 8. Connecting seat; 9. Pitch bearing; 10. Mounting flange; 11. Connecting rod; 12. Mounting plate; 13. Gear groove; 14. Vacuum head; 15. Air duct; 16. Vacuum cleaner. Detailed Implementation

[0031] To more clearly illustrate the purpose, technical solution, and beneficial effects of this application, a further detailed description of this application is provided below in conjunction with illustrations and specific embodiments. It should be specifically noted that the specific embodiments described below are only for illustrating the technical content of this application and do not constitute a limitation on the scope of protection of this application.

[0032] Regarding the explanation of terminology: In this application, "and / or" is used to describe the relationship between related objects, covering three possible situations: taking "A and / or B" as an example, it can indicate the situation where only A exists, A and B exist simultaneously, or only B exists; the symbol " / " indicates the "or" relationship between related objects, such as "A / B" which refers to A or B.

[0033] Regarding the description of the embodiments: The terms "exemplary" and "for example" appearing in this application are only used to illustrate the technical solutions through specific examples. It should be particularly emphasized that any implementation method or design scheme marked as "exemplary" or "for example" should not be construed as having an advantage over other solutions. Such expressions are only used to present the technical concepts more intuitively.

[0034] Example 1: See Figures 1-10 As shown, the present invention provides a wind turbine pitch structure, including a hub cover 1, the hub cover 1 including a main cover 101 and a cover 102 mounted on the main cover 101, three blades 2 are evenly distributed and detachably mounted on the outer side of the main cover 101, and also includes: Rotating component 3, multiple rotating components 3 are respectively disposed inside the hub cover 1. The rotating component 3 is used to drive the corresponding blade 2 to rotate. The rotating component 3 includes a rotating gear 301, which is rotatably connected to the inner wall of the hub cover 1. The frame 4 is fixedly installed inside the main cover 101. Locking parts 5 are evenly arranged on the frame 4. The locking parts 5 are used to lock the rotating gear 301 in a preset manner. The controller 6 is provided on the frame 4. The circulating oil injection component 7 is mounted on the frame 4. The circulating oil injection component 7 includes an oil injection head 701 and an oil receiving box 702. The oil injection head 701 and the oil receiving box 702 are respectively mounted on opposite sides of the rotating gear 301 for circulating and collecting lubricating oil.

[0035] Multiple fastening bolts 103 are distributed on the sides of the cover 102. The fastening bolts 103 are used to fix the main cover 101 and the cover 102 to each other.

[0036] Of course, two, four, five or six blades 2 can also be evenly distributed and detachably installed on the outer side of the main cover 101.

[0037] like Figure 3 As shown, multiple docking seats 8 are fixedly installed on the outer wall of the main cover 101, and a pitch bearing 9 is fixedly installed at the root of the blade 2. The outer ring of the pitch bearing 9 is fixedly provided with a mounting flange 10, and the mounting flange 10 is fixedly connected to the docking seat 8 by bolts.

[0038] The main cover 101 of the wheel hub cover 1 is welded from Q345 steel, with a diameter of 1.8 mm and a thickness of 8 mm. The cover 102 is made of 6061-T6 aluminum alloy, with 12 M16 fastening bolts 103 evenly distributed along the edge. The flange faces of the cover 102 and the main cover 101 are connected by the fastening bolts 103. Nitrile rubber sealing rings are installed at the sealing gaps to ensure an IP54 protection rating.

[0039] Three mating seats 8 are distributed 120° around the circumference of the main cover 101 sidewall. Each mating seat 8 has a stepped hole on its inner side that matches the outer ring of the pitch bearing 9. The pitch bearing 9 at the root of blade 2 is a double-row four-point contact ball bearing. The outer ring is welded with a 10mm thick mounting flange 10. Eight Φ18 bolt holes are evenly opened on the mounting flange 10. It is fixed to the mating seat 8 with M16 high-strength bolts with a preload torque of 350. .

[0040] The controller 6 is installed on the rack 4. The controller 6 can be a PLC, model S7-1200. The controller 6 collects the position and transmission torque of the rotating gear 301 in real time through the angle sensor and torque sensor. The controller 6, the angle sensor and the torque sensor are all common existing technologies on the market, so their structure is not described in this device.

[0041] like Figure 3As shown, the pitch bearing 9 is inserted into the docking seat 8. The inner ring of the pitch bearing 9 has several docking holes in a circular pattern. One end of the rotating gear 301 in the rotating component 3 extends and is rotatably engaged with one end of the docking seat 8. Several docking rods 11 are fixed in a circular pattern on the rotating gear 301. The docking rods 11 are inserted into the docking holes.

[0042] like Figure 4 , 5 As shown, the inner wall of the main cover 101 is uniformly fixed with mounting plates 12. The rotating component 3 is disposed on one side of the mounting plate 12. The rotating component 3 also includes a rotating motor 302. The rotating motor 302 is fixedly mounted on the mounting plate 12. The output end of the rotating motor 302 is fixedly mounted with a drive gear 303. The drive gear 303 meshes with the rotating gear 301 for transmission.

[0043] It should be noted that three mounting plates 12 are welded to the inner wall of the main cover 101. The rotary motor 302 is a 1.5kW servo motor, model MSME152G1V, which is fixed to the mounting plate 12 by four M12 bolts. The output end is connected to the drive gear 303, which has a module of 3, 20 teeth, and is made of 20CrMnTi carburized and quenched material.

[0044] The rotating gear 301 is fixed with an extension sleeve on one side of the main cover 101. The extension sleeve is rotatably connected to the bearing position on the main cover 101 through a deep groove ball bearing. The meshing clearance between the rotating gear 301 and the driving gear 303 is controlled at 0.15-0.2mm.

[0045] like Figure 10 As shown, the locking component 5 includes a telescopic mechanism 501, one end of which passes through the mounting plate 12, and a locking gear 502 is fixedly installed on one end of the telescopic mechanism 501.

[0046] like Figure 5 , 8 As shown, a gear groove 13 is provided at the middle position of the rotating gear 301 to cooperate with the locking gear 502. When the locking gear 502 extends into the gear groove 13, it locks the rotating gear 301.

[0047] In this embodiment, the telescopic mechanism 501 is a telescopic cylinder. The cylinder body end of the telescopic cylinder is fixedly mounted on the frame 4. The locking gear 502 is mounted on the end of the telescopic rod of the telescopic cylinder. The mounting plate 12 is provided with a spline hole. The telescopic rod of the telescopic cylinder is provided with a spline structure at the end near the locking gear 502. The spline structure of the telescopic rod passes through the spline hole, and the spline structure and the spline hole are axially slidably engaged.

[0048] The telescopic cylinder can be an electric cylinder or an electric push rod. The spline structure on the telescopic rod passes through the spline hole, and the spline structure and the spline hole slide and mesh axially. This not only supports the telescopic rod through the mounting plate 12, improving the stability of the telescopic rod and ensuring that the locking gear 502 is always coaxial with the rotating gear 301, but also prevents the telescopic rod from rotating.

[0049] like Figure 7 As shown, an upper box 703 is fixedly installed on the upper end of the frame 4. An oil injection circulation pump 704 is installed inside the upper box 703. The output end of the oil injection circulation pump 704 is fixedly connected to multiple oil injection branch pipes 706 through an oil injection pipe 705. One end of the oil injection branch pipe 706 is connected to an oil injection head 701 at one end of the rotating gear 301. The oil injection head 701 is fixedly connected to the mounting plate 12 through a support rod 707.

[0050] The oil filling head 701 has a slot in the middle, and a vacuum head 14 is installed inside the slot. The vacuum head 14 is connected to a vacuum cleaner 16 through an air duct 15. The vacuum cleaner 16 and the oil filling head 701 are fixedly connected to each other.

[0051] An oil receiving pipe 708 is fixedly connected to one end of the oil receiving box 702 at the other end of the rotating gear 301. An oil suction pump 709 is fixedly connected to the end of the oil receiving pipe 708. An oil storage box 710 is fixedly installed at the lower end of the frame 4. The oil suction pump 709 is fixedly installed on the oil storage box 710. A screen plate 711 is detachably connected inside the oil storage box 710. An oil distribution pump 712 is fixedly installed at the lower end of the oil storage box 710. An oil distribution pipe 713 is fixedly connected to one end of the oil distribution pump 712. One end of the oil distribution pipe 713 is connected to the upper box 703.

[0052] An oil circulation pump 704 is installed inside the upper box 703, with a flow rate of 10L / min and a head of 15m. The oil injection pipe 705 is a Φ16 high-pressure hose, branching into three Φ10 oil injection manifolds 706. The ends of the oil injection manifolds 706 are connected to the oil injection heads 701, which are fixed to the mounting plate 12 by stainless steel support rods 707. The oil injection head 701 has a fan-shaped nozzle installed inside, and the oil injection manifolds 706 are connected to the fan-shaped nozzle. The fan-shaped nozzle sprays a fan-shaped oil mist to lubricate the rotating gear 301.

[0053] The oiling head 701 has a groove and a built-in suction head 14. The suction head 14 is connected to a 200W vacuum cleaner 16 via a Φ30 hose, with a suction power of ≥2kPa. The distance between the suction port and the rotating gear 301 is 1~3mm. Before spraying oil to lubricate the rotating gear 301, the vacuum cleaner 16 is used to remove oil stains, iron filings, etc. from the rotating gear 301.

[0054] The oil receiving box 702 is fixed on the other side of the rotating gear 301. The two side walls inside the oil receiving box 702 are provided with adsorption grooves at the two end faces of the rotating gear 301. The two side walls inside the oil receiving box 702 are spaced 1~2mm from the two end faces of the rotating gear 301. The oil receiving pipe 708 is connected to the adsorption grooves on both sides and is connected to the oil suction pump 709, thereby adsorbing the oil flowing to the end face of the rotating gear 301 and transporting the oil to the oil storage box 710.

[0055] Inside the oil storage box 710, a single-layer detachable stainless steel screen plate 711 with a pore size of 0.1mm is horizontally placed via an internal support plate. An opening and closing door is provided on one side of the oil storage box 710, with a sealing gasket at the edge of the door. The opening and closing door is then fixedly connected to the oil storage box 710 with bolts. An oil distribution pump 712 is installed at the bottom of the oil storage box 710, which pumps the filtered oil back to the upper box 703 through a Φ16 oil distribution pipe 713, forming a closed-loop circulation.

[0056] Example 2: This embodiment provides a method for using a wind turbine pitch structure, employing the wind turbine pitch structure described in Embodiment 1. The method includes the following steps: S1, Installation of blade 2 and hub cover 1; Insert the outer ring of the pitch bearing 9 at the root of blade 2 into the mating seat 8 on the side wall of the main cover 101, and fix it to the mating seat 8 with bolts through the mounting flange 10 to ensure the connection between blade 2 and hub cover 1. The docking rod 11 at one end of the rotating gear 301 is inserted into the docking hole of the inner ring of the pitch bearing 9 to complete the transmission connection between the blade 2 and the rotating component 3. Close the cover 102 and fix the main cover 101 to the cover 102 by the fastening bolts 103 on the side to form a closed hub space.

[0057] S2: Initialization of the circulating oil injection system; Inject lubricating oil of the specified specifications into the oil reservoir 710; Start the oil circulation pump 704, and deliver the oil to the oil head 701 at one end of the rotating gear 301 through the oil injection pipe 705 and the oil injection branch pipe 706. At the same time, start the oil suction pump 709, so that the oil collected in the oil receiving box 702 flows back to the oil storage box 710 through the oil receiving pipe 708, thus completing the test of the lubricating oil circulation path.

[0058] S3: Pitch adjustment operation; Unlock rotating gear 301; After receiving the pitch control command, the controller 6 controls the telescopic mechanism 501 in the locking member 5 to retract, which drives the locking gear 502 to disengage from the gear groove 13 in the middle of the rotating gear 301, thereby releasing the mechanical lock on the rotating gear 301. Drive blade 2 to rotate; When the rotary motor 302 starts, the drive gear 303 at its output end drives the rotary gear 301 to rotate. Through the mating rod 11 and the mating hole of the inner ring of the pitch bearing 9, the blade 2 is driven to rotate around the pitch bearing 9 to achieve angle adjustment. The controller 6 monitors the position of the blade 2 in real time according to the preset angle parameters. When the target angle is reached, the rotary motor 302 stops working. Locking and fixing; When the telescopic mechanism 501 extends, the locking gear 502 re-engages into the gear groove 13 of the rotating gear 301, forming a mechanical lock on the rotating gear 301 to prevent the blade 2 from shifting at an angle due to airflow disturbance.

[0059] S4. Circulating oil injection and cleaning maintenance; Gear lubrication and oil circulation; During pitch adjustment, the oil circulation pump 704 works continuously, and the oil injection head 701 sprays lubricating oil onto the meshing point of the rotating gear 301 and the drive gear 303 to reduce transmission wear. Excess oil dripping from the meshing point is collected by the oil receiving box 702 at the other end, and transported to the oil storage box 710 via the oil receiving pipe 708 and the oil suction pump 709. After being filtered by the sieve plate 711, it is pumped back to the upper box 703 by the oil distribution pump 712 through the oil distribution pipe 713, thus realizing the recycling of lubricating oil. Clean the meshing area; Before adding oil, start the vacuum cleaner 16 and use the vacuum head 14 in the middle slot of the oiling head 701 to remove metal shavings and dust generated by gear meshing, so as to avoid impurities from mixing into the oil or aggravating gear wear.

[0060] S5. Anomaly handling and regular maintenance; Emergency lockout; When the controller 6 detects an abnormal pitch angle or a gear transmission failure, it immediately triggers the locking element 5 to activate. The telescopic mechanism 501 quickly extends to lock the rotating gear 301 with the locking gear 502, preventing the blade 2 from going out of control. Oil changes and component inspections; Regularly check the wear of the tooth surfaces of the rotating gear 301 and the drive gear 303 to ensure the stable performance of the transmission system; Periodically disassemble the sieve plate 711 of the oil reservoir 710, clean the filtered impurities and replace the sieve plate 711 with a new one, and replenish the lubricating oil in the oil reservoir 710. Replace the filter inside the vacuum cleaner 16 regularly.

[0061] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims. Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A wind turbine pitch structure, comprising a hub cover (1), the hub cover (1) comprising a main cover (101) and a cover (102) mounted on the main cover (101), wherein a plurality of blades (2) are detachably and evenly distributed around the outer side of the main cover (101), characterized in that, It also includes: Rotating component (3), multiple rotating components (3) are respectively disposed in the hub cover (1), the rotating component (3) is used to drive the corresponding blade (2) to rotate, the rotating component (3) includes a rotating gear (301), the rotating gear (301) is rotatably connected to the inner wall of the hub cover (1); The frame (4) is fixedly installed inside the main cover (101). Locking parts (5) are evenly arranged on the frame (4). The locking parts (5) are used to lock the rotating gear (301) in advance. A controller (6) is provided on the frame (4). The circulating oil injection component (7) is installed on the frame (4). The circulating oil injection component (7) includes an oil injection head (701) and an oil receiving box (702). The oil injection head (701) and the oil receiving box (702) are respectively installed on opposite sides of the rotating gear (301) for circulating and collecting lubricating oil.

2. The wind turbine pitch structure according to claim 1, characterized in that: Multiple docking seats (8) are fixedly installed on the outer wall of the main cover (101), and a pitch bearing (9) is fixedly installed at the root of the blade (2). The outer ring of the pitch bearing (9) is fixedly provided with a mounting flange (10), and the mounting flange (10) and the docking seat (8) are fixedly connected by bolts.

3. The wind turbine pitch structure according to claim 2, characterized in that: The pitch bearing (9) is inserted into the docking seat (8). The inner ring of the pitch bearing (9) is provided with several docking holes in a circular pattern. One end of the rotating gear (301) in the rotating component (3) extends and is rotatably engaged inside one end of the docking seat (8). Several docking rods (11) are fixed in a circular pattern on the rotating gear (301). The docking rods (11) are inserted into the docking holes.

4. The wind turbine pitch structure according to claim 1, characterized in that: The inner wall of the main cover (101) is uniformly fixed with a mounting plate (12). The rotating component (3) is located on one side of the mounting plate (12). The rotating component (3) also includes a rotating motor (302). The rotating motor (302) is fixedly mounted on the mounting plate (12). The output end of the rotating motor (302) is fixedly mounted with a drive gear (303). The drive gear (303) meshes with the rotating gear (301) for transmission.

5. A wind turbine pitch structure according to claim 4, characterized in that: The locking component (5) includes a telescopic mechanism (501), one end of which passes through the mounting plate (12). A locking gear (502) is fixedly installed at one end of the telescopic mechanism (501). A gear groove (13) that cooperates with the locking gear (502) is provided in the middle of the rotating gear (301). When the locking gear (502) extends into the gear groove (13), it locks the rotating gear (301).

6. The wind turbine pitch structure according to claim 5, characterized in that: The telescopic mechanism (501) is a telescopic cylinder. The locking gear (502) is installed at the end of the telescopic rod of the telescopic cylinder. The mounting plate (12) is provided with a spline hole. The telescopic rod of the telescopic cylinder is provided with a spline structure at the end near the locking gear (502). The spline structure of the telescopic rod passes through the spline hole and the spline structure slides and engages axially with the spline hole.

7. A wind turbine pitch structure according to claim 5, characterized in that: The upper end of the frame (4) is fixedly installed with an upper box (703). The upper box (703) is equipped with an oil injection circulation pump (704). The output end of the oil injection circulation pump (704) is fixedly connected to multiple oil injection branch pipes (706) through an oil injection pipe (705). One end of the oil injection branch pipe (706) is connected to the oil injection head (701) at one end of the rotating gear (301). The oil injection head (701) is fixedly connected to the mounting plate (12) through a support rod (707).

8. A wind turbine pitch structure according to claim 7, characterized in that: The oil filling head (701) has a slot in the middle, and a vacuum head (14) is installed inside the slot. The vacuum head (14) is connected to a vacuum cleaner (16) through an air duct (15). The vacuum cleaner (16) and the oil filling head (701) are fixedly connected to each other.

9. A wind turbine pitch structure according to claim 8, characterized in that: One end of the oil receiving box (702) at the other end of the rotating gear (301) is fixedly connected to an oil receiving pipe (708), and the end of the oil receiving pipe (708) is fixedly connected to an oil suction pump (709). An oil storage box (710) is fixedly installed at the lower end of the frame (4). The oil suction pump (709) is fixedly installed on the oil storage box (710). A sieve plate (711) is detachably connected inside the oil storage box (710). An oil distribution pump (712) is fixedly installed at the lower end of the oil storage box (710). One end of the oil distribution pump (712) is fixedly connected to an oil distribution pipe (713). One end of the oil distribution pipe (713) is connected to the upper box (703).

10. A method of using a wind turbine pitch structure, comprising a wind turbine pitch structure as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. Installation of blade (2) and hub cover (1); (1) Insert the outer ring of the pitch bearing (9) at the root of the blade (2) into the mating seat (8) on the side wall of the main cover (101), and fix it to the mating seat (8) by bolting the mounting flange (10) to ensure the connection between the blade (2) and the hub cover (1); (2) The docking rod (11) at one end of the rotating gear (301) is inserted into the docking hole of the inner ring of the pitch bearing (9) to complete the transmission connection between the blade (2) and the rotating part (3). (3) Close the cover (102) and fix the main cover (101) and the cover (102) with the fastening bolts (103) on the side to form a closed hub space; S2: Initialization of the circulating oil injection system; (1) Inject lubricating oil of the specified specifications into the oil reservoir (710); (2) Start the oil injection circulation pump (704) and deliver the oil to the oil injection head (701) set at one end of the rotating gear (301) through the oil injection pipe (705) and the oil injection branch pipe (706). At the same time, start the oil suction pump (709) so that the oil collected in the oil receiving box (702) flows back to the oil storage box (710) through the oil receiving pipe (708) to complete the test of the lubricating oil circulation path; S3: Pitch adjustment operation; (1) Unlock the rotating gear (301); After receiving the pitch command, the controller (6) controls the telescopic mechanism (501) in the locking member (5) to retract, thereby driving the locking gear (502) to disengage from the gear groove (13) in the middle of the rotating gear (301) and releasing the mechanical lock on the rotating gear (301); (2) Drive the blade (2) to rotate; When the rotary motor (302) starts, the drive gear (303) at its output end drives the rotary gear (301) to rotate. Through the mating rod (11) and the mating hole of the inner ring of the pitch bearing (9), the blade (2) is driven to rotate around the pitch bearing (9) to achieve angle adjustment. The controller (6) monitors the position of the blade (2) in real time according to the preset angle parameters. When the target angle is reached, the rotary motor (302) stops working. (3) Locking and fixing; The telescopic mechanism (501) extends, and the locking gear (502) re-engages into the gear groove (13) of the rotating gear (301), forming a mechanical lock on the rotating gear (301) to prevent the blade (2) from shifting due to airflow disturbance; S4. Circulating oil injection and cleaning maintenance; (1) Gear lubrication and oil circulation; During pitch adjustment, the oil circulation pump (704) works continuously, and the oil injection head (701) sprays lubricating oil at the meshing point of the rotating gear (301) and the drive gear (303) to reduce transmission wear. Excess oil dripping from the meshing point is collected by the oil collection box (702) at the other end, and transported to the oil storage box (710) via the oil collection pipe (708) and the oil suction pump (709). After being filtered by the sieve plate (711), it is pumped back to the upper box (703) by the oil distribution pump (712) through the oil distribution pipe (713), thus realizing the recycling of lubricating oil. (2) Clean the meshing area; Before adding oil, start the vacuum cleaner (16) and use the vacuum head (14) in the middle slot of the oiling head (701) to adsorb the metal chips and dust generated by gear meshing, so as to avoid impurities from mixing into the oil or aggravating gear wear. S5. Anomaly handling and regular maintenance; (1) Emergency lockout; When the controller (6) detects an abnormal pitch angle or a gear transmission failure, it immediately triggers the locking element (5) to operate, and the telescopic mechanism (501) quickly extends to lock the rotating gear (301) with the locking gear (502) to prevent the blades (2) from going out of control; (2) Fluid replacement and component inspection; Regularly check the wear of the tooth surfaces of the rotating gear (301) and the drive gear (303) to ensure the stable performance of the transmission system; Periodically disassemble the sieve plate (711) of the oil reservoir (710), clean the filtered impurities and replace the sieve plate (711) with a new one, and replenish the lubricating oil in the oil reservoir (710); Replace the filter inside the vacuum cleaner (16) regularly.

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