CN209163995U - A kind of hydraulic sliding bearing formula yaw system of modularization - Google Patents
A kind of hydraulic sliding bearing formula yaw system of modularization Download PDFInfo
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- CN209163995U CN209163995U CN201821661596.XU CN201821661596U CN209163995U CN 209163995 U CN209163995 U CN 209163995U CN 201821661596 U CN201821661596 U CN 201821661596U CN 209163995 U CN209163995 U CN 209163995U
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- yaw
- oil
- fluted disc
- liner
- course brake
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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Abstract
The utility model discloses a kind of hydraulic sliding bearing formula yaw systems of modularization, it is intended to the deficiency that the yaw system transporting and hoisting for solving wind power generating set is difficult, bearing capacity is low, maintenance is inconvenient, friction lining service life easy to wear is short.The utility model includes yaw rack, yaw fluted disc, rack-mounted yaw drive and off-course brake, yaw drive is for driving yaw fluted disc rotation, off-course brake is used for braking yaw fluted disc, clip slot is equipped between off-course brake and yaw rack, yaw fluted disc is mounted in clip slot, liner and lower liner are installed respectively on clip slot top and bottom sidewall, the radial liner of clip slot bottom surface installation, oil groove is equipped on the surface of upper liner and radial liner direction yaw fluted disc, lower liner connects piston, off-course brake is equipped with oil cylinder, piston is mounted in oil cylinder, oil cylinder is connected to hydraulic system.
Description
Technical field
The utility model relates to a kind of wind power generating sets, more specifically, it relates to a kind of hydraulic sliding axle of modularization
Hold formula yaw system.
Background technique
With the utilization of continually developing of wind-resources, the continuous innovation of wind power generating set technology, wind power generating set is gradually
Towards the trend development of " low wind speed, large capacity, long blade ", the design size of cabin and weight is caused to be continuously increased.If according to
Conventional design method is so used, only the weight of cabin and size are just already close to the transportation limitation of road, and increase lifting
Difficulty.
With being continuously increased for single-machine capacity, design size and weight are also being accordingly increased, in conventional design method
Under, the bearing capacity of point contact and line contacting pattern yaw bearing would become hard to carrying large sized unit cabin weight, and with
The increase of nacelle weight and size, the size that undoubtedly will lead to yaw bearing increase, and considerably increase the difficult processing of yaw bearing
Degree.
In addition, finding in the O&M of blower, existing yaw system has the following problems: 1, yaw system is configured
Off-course brake need to manually adjust the gap between brake disc by bolt is adjusted, and it is big adjust error, and adjust bolt without lock
It is poor to determine device, self-locking performance, loosening is easily generated in unit running process；2, off-course brake relies on disc spring group or tools for bolts ' pretension
Power provides yaw braking, and it is uncontrollable that there are yaw dampings, and coefficient of friction is high, and sliding mats need to configure wear detector and go forward side by side
Row periodic maintenance.3, abnormal difficult when carrying out off-course brake maintenance, especially upper liner replacement.For yaw brake
Device problem difficult in maintenance, all forced investment energy of more units researches and develops off-course brake disassembling fixture, investment in industry
A large amount of cost and effort.
Utility model content
The yaw system transporting and hoisting that the utility model overcomes wind power generating set is difficult, bearing capacity is low, safeguards not
Just, the short deficiency of friction lining service life easy to wear provides a kind of hydraulic sliding bearing formula yaw system of modularization, its side
Large capacity wind power generating set transport, lifting, can neatly control yaw damping, make wind power generating set operation more
Steady reliable, bearing capacity is strong, effectively reduces the abrasion of friction lining, extends the service life of friction lining, reduces
The replacement of friction lining, it is convenient for safeguarding.
In order to solve the above-mentioned technical problem, the utility model uses a kind of following technical scheme: hydraulic sliding axle of modularization
Hold formula yaw system, including yaw rack, yaw fluted disc, rack-mounted yaw drive and off-course brake, yaw
Driver for drive yaw fluted disc rotation, off-course brake be used for braking yaw fluted disc, off-course brake and yaw rack it
Between be equipped with clip slot, yaw fluted disc be mounted in clip slot, liner and lower liner, clip slot bottom surface are installed on clip slot top and bottom sidewall respectively
Installation is radial to be padded, and is equipped with oil groove on the surface of upper liner and radial liner direction yaw fluted disc, lower liner connects piston, partially
The brake that navigates is equipped with oil cylinder, and piston is mounted in oil cylinder, and oil cylinder is connected to hydraulic system.
Yaw system is separately provided, and separates with wind power generating set, realizes modularized design, can carry out independent transport
And lifting, solve the problems, such as tunnel, 5m limit for height in highway transportation, while effectively reducing the weight of cabin transport and lifting,
Facilitate transport, the lifting of large capacity wind power generating set.Yaw system by yaw rack, yaw fluted disc, yaw drive, partially
Navigate brake composition, components can independent transport and lifting, transport and lifting are convenient.Yaw fluted disc is mounted in clip slot, is yawed
Fluted disc bearing area is big, improves the bearing capacity of Wind turbines yaw system.Hydraulic system provides pressure to oil cylinder, thus logical
Crossing piston pushes lower liner to move up and be converted into braking moment, makes to yaw fluted disc and is clamped between liner and lower liner, real
Now brake.It is equipped with oil groove on the surface of upper liner and radial liner direction yaw fluted disc, it, can be effective by filling lubricant grease
The abrasion for padding in reduction and radially padding, extends service life, achievees the purpose that unit durability period inner liner is free of replacement.
Braking moment is provided by hydraulic system, is reached by the control to oil pressure and piston stroke is precisely controlled, realizes and yaw is hindered
The controllable purpose of Buddhist nun's torque.This hydraulic sliding bearing formula yaw system of modularization facilitates the fortune of large capacity wind power generating set
Defeated, lifting, can neatly control yaw damping, keep wind power generating set operation more steady reliable, bearing capacity is strong, effectively subtracts
The abrasion for having lacked friction lining extends the service life of friction lining, reduces the replacement of friction lining, convenient for safeguarding.
Preferably, hydraulic system includes main hydraulic pressure unit, auxiliary hydraulic pressure unit, controller, if off-course brake is equipped with
Dry, oil cylinder a part on each off-course brake is master cylinder, and another part is auxiliary cylinder；Main hydraulic pressure unit includes oil
Liquid bath, main oil inlet pipe, cut-off oil pipe, main oil inlet pipe one end are connected to oil liquid slot, and the other end is connected to all master cylinders, main oil inlet pipe
On oil pump, pressure sensor, accumulator are successively installed, unidirectional inlet valve is installed on the pipeline between master cylinder and main oil inlet pipe,
Cut-off oil pipe is connected to all master cylinders, ends and successively installs pressure switch and shut-off valve on oil pipe；Auxiliary hydraulic pressure unit includes
Oil liquid slot, auxiliary oil inlet pipe, relief conduit, solenoid directional control valve, overflow valve assist successively installing oil pump, pressure biography on oil inlet pipe
Sensor, accumulator, auxiliary oil inlet pipe one end are connected to oil liquid slot, and the other end is connected to solenoid directional control valve, and overflow valve, which is mounted on, unloads pressure oil
Guan Shang, relief conduit one end are connected to oil liquid slot, and the other end is connected to solenoid directional control valve, between all auxiliary cylinders and solenoid directional control valve
It is connected to by oil pipe；Pressure switch, oil pump, pressure sensor, solenoid directional control valve are electrically connected with the controller.
Hydraulic system is designed using redundance type, and main hydraulic pressure unit and auxiliary hydraulic pressure unit can to off-course brake offer pressure
The hydraulic oil of control.Unit in generating state, devote oneself to work state by main hydraulic pressure unit and auxiliary hydraulic pressure unit；It is needed in unit
When yaw, auxiliary hydraulic pressure unit suspend pressure supply, it will thus provide yaw damping be reduced to design value.In addition, in main hydraulic pressure unit and
When hydraulic system fault occurs in auxiliary hydraulic pressure unit any one, another hydraulic pressure unit be can work normally, and reduce unit because of liquid
Press system failure bring operation risk.
Preferably, connecting several adjusting screws on off-course brake, adjusts screw front end and be connected on radial liner.It is logical
The gap between the radial liner of screw adjustment and yaw fluted disc is overregulated, the gap generated after radial pad wear is compensated.
Preferably, off-course brake includes upper cylinder body and lower cylinder body, upper cylinder body and lower cylinder body link together L-shaped knot
Structure, between lower cylinder body and yaw rack, oil cylinder is arranged on lower cylinder body for clip slot setting.The off-course brake of this structure setting
It is convenient for disassembly and assembly.
Preferably, structure, yaw frame upper end are equipped with inwardly projecting connection bulge loop, connect convex yaw rack in a ring
Several connecting holes are uniformly arranged on ring, yaw rack lower end is equipped with inwardly projecting installation bulge loop, and off-course brake is mounted on
It installs on bulge loop.The setting of bulge loop is connected convenient for the connection of yaw rack and wind power generating set, and contact surface product is big,
Bearing capacity is big.Bulge loop is installed to install convenient for the arrangement of off-course brake.
Preferably, yaw rack outer wall is equipped with two mounting ears being oppositely arranged, fastening installation on each mounting ear
Several yaw drives.The mounting arrangements of yaw drive are convenient in the setting of mounting ear.
Preferably, yaw fluted disc outer edge extends outward yaw rack outer edge, yaws and be uniformly arranged on fluted disc
Several mounting holes, mounting hole are placed in yaw shell outside.The yaw fluted disc of this structure setting is easily installed connection.
Compared with prior art, the utility model has the beneficial effects that the hydraulic sliding bearing formula yaw system of (1) modularization
Using modular design method, independent transport and lifting can be carried out, the weight of cabin has rationally been shared, reduce cabin fortune
Defeated size effectively reduces the difficulty of transport and lifting, has saved cost of the wind power generating set in transport and lifting；
(2) braking moment is provided by hydraulic system, is reached by the control to oil pressure and piston stroke is precisely controlled, realized to yaw
The controllable purpose of damping torque；(3) hydraulic system is designed using redundance type, and main hydraulic pressure unit and auxiliary hydraulic pressure unit give yaw system
Dynamic device provides the hydraulic oil of pressure controllable；Unit in generating state, devote oneself to work by main hydraulic pressure unit and auxiliary hydraulic pressure unit
State；When unit needs to yaw, auxiliary hydraulic pressure unit suspend pressure supply, it will thus provide yaw damping be reduced to design value；In addition,
When hydraulic system fault occur in main hydraulic pressure unit and auxiliary hydraulic pressure unit any one, another hydraulic pressure unit can normal work
Make, reduces unit because of hydraulic system fault bring operation risk；(4) surface with radial liner direction yaw fluted disc is padded on
On be equipped with oil groove, by filling lubricant grease, liner and the abrasion that radially pads can be effectively reduced, extended using the longevity
Life, achievees the purpose that unit durability period inner liner is free of replacement；(5) between each component of yaw system and yaw system and wind-force
Contact surface product between generating set is big, and bearing capacity is strong.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the utility model；
Fig. 2 is the bottom view of the utility model；
Fig. 3 is the A-A cross-sectional view of Fig. 2 of the utility model；
Fig. 4 is the partial enlargement diagram of Fig. 3 of the utility model；
Fig. 5 is the structural schematic diagram of the off-course brake of the utility model；
Fig. 6 is another direction structure schematic diagram of the off-course brake of the utility model；
Fig. 7 is the schematic diagram of the hydraulic system of the utility model；
In figure: 1, yaw rack, 2, yaw fluted disc, 3, yaw drive, 4, off-course brake, 5, clip slot, 6, upper liner,
7, lower liner, 8, radial liner, 9, oil groove, 10, piston, 11, oil cylinder, 12, main hydraulic pressure unit, 13, auxiliary hydraulic pressure unit, 14,
Oil liquid slot, 15, main oil inlet pipe, 16, cut-off oil pipe, 17, oil pump, 18, pressure sensor, 19, accumulator, 20, unidirectional inlet valve,
21, pressure switch, 22, shut-off valve, 23, auxiliary oil inlet pipe, 24, relief conduit, 25, solenoid directional control valve, 26, overflow valve, 27, tune
Save screw, 28, send oil pipe, 29, upper cylinder body, 30, lower cylinder body, 31, connection bulge loop, 32, connecting hole, 33, installation bulge loop, 34, peace
Fill ear, 35, mounting hole.
Specific embodiment
Below by specific embodiment, and in conjunction with attached drawing, the technical solution of the utility model work is further specifically retouched
It states:
Embodiment: a kind of hydraulic sliding bearing formula yaw system of modularization (referring to attached drawing 1 to attached drawing 7), including yaw machine
Frame 1, yaw fluted disc 2, rack-mounted yaw drive 3 and off-course brake 4, yaw rack outer wall are equipped with opposite set
Two mounting ears 34 set, equal three yaw drives of fastening installation on each mounting ear.Yaw drive is equipped with driving gear,
Drive gear and yaw fluted disc outer ring engaged transmission.For driving yaw fluted disc rotation, off-course brake is used for yaw drive
Braking yaw fluted disc is equipped with clip slot 5 between off-course brake and yaw rack, yaw fluted disc is mounted in clip slot, above and below clip slot
Liner 6 and lower liner 7 are installed on side wall respectively, radial liner 8, upper liner and radial direction liner are installed towards yaw in clip slot bottom surface
Oil groove 9 is equipped on the surface of fluted disc, lower liner connects piston 10, and off-course brake is equipped with oil cylinder 11, and piston is mounted on oil
In cylinder, oil cylinder is connected to hydraulic system.Sealing ring and dustband are installed between piston and oil cylinder.Several tune are connected on off-course brake
Screw 27 is saved, screw front end is adjusted and is connected on radial liner.Upper liner is equipped with the oil filler point being connected to oil groove, radial to pad
It is equipped with the oil filler point being connected to oil groove, two oil filler points are respectively communicated with two and send oil pipe 28.Off-course brake includes 29 He of upper cylinder body
Lower cylinder body 30, upper cylinder body and lower cylinder body link together L-shaped structure, and clip slot setting is between lower cylinder body and yaw rack, oil
Cylinder is arranged on lower cylinder body.
Rack structure in a ring is yawed, yaw frame upper end is equipped with inwardly projecting connection bulge loop 31, connects on bulge loop
Cloth is provided with several connecting holes 32, and yaw rack lower end is equipped with inwardly projecting installation bulge loop 33, and off-course brake is mounted on
It fills on bulge loop.Yaw fluted disc outer edge extends outward yaw rack outer edge, yaws and has been uniformly arranged several installations on fluted disc
Hole 35, mounting hole are placed in yaw shell outside.
Hydraulic system includes main hydraulic pressure unit 12, auxiliary hydraulic pressure unit 13, controller, and off-course brake is equipped with several,
Oil cylinder a part on each off-course brake is master cylinder, and another part is auxiliary cylinder, in master cylinder and auxiliary cylinder
Piston is installed, each piston is connect with a lower liner respectively；Main hydraulic pressure unit includes oil liquid slot 14, main oil inlet pipe 15, cut-off
Oil pipe 16, main oil inlet pipe one end are connected to oil liquid slot, and the other end is connected to all master cylinders, successively installs oil pump in main oil inlet pipe
17, pressure sensor 18, accumulator 19 install unidirectional inlet valve 20, cut-off oil on the pipeline between master cylinder and main oil inlet pipe
Pipe is connected to all master cylinders, ends and successively installs pressure switch 21 and shut-off valve 22 on oil pipe；Auxiliary hydraulic pressure unit includes oil
Liquid bath, auxiliary oil inlet pipe 23, relief conduit 24, solenoid directional control valve 25, overflow valve 26, assist oil inlet pipe on successively install oil pump,
Pressure sensor, accumulator, auxiliary oil inlet pipe one end are connected to oil liquid slot, and the other end is connected to solenoid directional control valve, and overflow valve is mounted on
In relief conduit, relief conduit one end is connected to oil liquid slot, and the other end is connected to solenoid directional control valve, all auxiliary cylinders and electromagnetic switch
It is connected between valve by oil pipe；Pressure switch, oil pump, pressure sensor, solenoid directional control valve are electrically connected with the controller.
Main hydraulic pressure unit, auxiliary hydraulic pressure unit give the oil cylinder of off-course brake to provide pressure simultaneously, are pushed down by piston
Liner, which moves up, is converted into braking moment, is clamped in yaw fluted disc between liner and lower liner, keeps wind-driven generator
Required azimuth when group generating state；When needing to yaw, solenoid directional control valve commutates, and auxiliary cylinder, which unloads, is depressed into design institute
The damping torque needed is yawed；For wind power generating set in generating state, hydraulic system keeps the hydraulic oil of 200bar to provide
The yaw braking of design；When hydraulic system pressure is decayed, system pressure be down to 180bar and it is following when, pressure is opened
Pass movement, hydraulic system are repeated to suppress by oil pump, guarantee that system charge oil pressure is stablized between 180-200bar；Work as Wind turbines
When needing to yaw to wind according to wind vector, controller sends hydraulic regulation instruction to hydraulic system, and main hydraulic pressure unit is kept
The system pressure of 200bar is constant, and the solenoid directional control valve of auxiliary hydraulic pressure unit commutates to left position, overflow valve events, to auxiliary cylinder
Carry out pressure release；It is completed when set yaw acts, the solenoid directional control valve of auxiliary hydraulic pressure unit commutates to right position, auxiliary hydraulic pressure unit
Operation of oil pump, the 200bar charge oil pressure of the pressure recovery of auxiliary hydraulic pressure unit extremely setting.
Yaw system is separately provided, and separates with wind power generating set, realizes modularized design, can carry out independent transport
And lifting, solve the problems, such as tunnel, 5m limit for height in highway transportation, while effectively reducing the weight of cabin transport and lifting,
Facilitate transport, the lifting of large capacity wind power generating set.Yaw system by yaw rack, yaw fluted disc, yaw drive, partially
Navigate brake composition, components can independent transport and lifting, transport and lifting are convenient.Yaw fluted disc is mounted in clip slot, is yawed
Fluted disc bearing area is big, improves the bearing capacity of Wind turbines yaw system.Hydraulic system provides pressure to oil cylinder, thus logical
Crossing piston pushes lower liner to move up and be converted into braking moment, makes to yaw fluted disc and is clamped between liner and lower liner, real
Now brake.It is equipped with oil groove on the surface of upper liner and radial liner direction yaw fluted disc, it, can be effective by filling lubricant grease
The abrasion for padding in reduction and radially padding, extends service life, achievees the purpose that unit durability period inner liner is free of replacement.
Braking moment is provided by hydraulic system, is reached by the control to oil pressure and piston stroke is precisely controlled, realizes and yaw is hindered
The controllable purpose of Buddhist nun's torque.This hydraulic sliding bearing formula yaw system of modularization facilitates the fortune of large capacity wind power generating set
Defeated, lifting, can neatly control yaw damping, keep wind power generating set operation more steady reliable, bearing capacity is strong, effectively subtracts
The abrasion for having lacked friction lining extends the service life of friction lining, reduces the replacement of friction lining, convenient for safeguarding.
Embodiment described above is a kind of preferable scheme of the utility model, is not made to the utility model any
Formal limitation, there are also other variations and modifications on the premise of not exceeding the technical scheme recorded in the claims.
Claims (7)
1. a kind of hydraulic sliding bearing formula yaw system of modularization, characterized in that including yaw rack, yaw fluted disc, be mounted on
Yaw drive and off-course brake in rack, for driving yaw fluted disc rotation, off-course brake is used for yaw drive
Braking yaw fluted disc is equipped with clip slot between off-course brake and yaw rack, yaw fluted disc is mounted in clip slot, clip slot upper and lower sides
Liner and lower liner are installed on wall respectively, the installation of clip slot bottom surface is radial to be padded, upper liner and radial liner direction yaw fluted disc
Surface on be equipped with oil groove, lower liner connects piston, and off-course brake is equipped with oil cylinder, and piston is mounted in oil cylinder, oil cylinder
It is connected to hydraulic system.
2. the hydraulic sliding bearing formula yaw system of a kind of modularization according to claim 1, characterized in that hydraulic system packet
Main hydraulic pressure unit, auxiliary hydraulic pressure unit, controller are included, off-course brake is equipped with several, the oil cylinder on each off-course brake
A part is master cylinder, and another part is auxiliary cylinder；Main hydraulic pressure unit includes oil liquid slot, main oil inlet pipe, cut-off oil pipe, it is main into
Oil pipe one end is connected to oil liquid slot, and the other end is connected to all master cylinders, successively installed in main oil inlet pipe oil pump, pressure sensor,
Accumulator installs unidirectional inlet valve on the pipeline between master cylinder and main oil inlet pipe, and cut-off oil pipe is connected to all master cylinders,
Pressure switch and shut-off valve are successively installed on cut-off oil pipe；Auxiliary hydraulic pressure unit includes oil liquid slot, assists oil inlet pipe, unloads pressure oil
Pipe, solenoid directional control valve, overflow valve assist successively installing oil pump, pressure sensor, accumulator on oil inlet pipe, assist oil inlet pipe one
End connection oil liquid slot, the other end are connected to solenoid directional control valve, and overflow valve is mounted in relief conduit, and relief conduit one end is connected to oil liquid
Slot, the other end are connected to solenoid directional control valve, are connected between all auxiliary cylinders and solenoid directional control valve by oil pipe；Pressure switch, oil
Pump, pressure sensor, solenoid directional control valve are electrically connected with the controller.
3. the hydraulic sliding bearing formula yaw system of a kind of modularization according to claim 1, characterized in that off-course brake
Upper several adjusting screws of connection adjust screw front end and are connected on radial liner.
4. the hydraulic sliding bearing formula yaw system of a kind of modularization according to claim 1, characterized in that off-course brake
Including upper cylinder body and lower cylinder body, upper cylinder body and lower cylinder body link together L-shaped structure, and clip slot setting is in lower cylinder body and yaw machine
Between frame, oil cylinder is arranged on lower cylinder body.
5. the hydraulic sliding bearing formula yaw system of a kind of modularization according to any one of claims 1 to 4, feature
It is that structure, yaw frame upper end are equipped with inwardly projecting connection bulge loop, connect and be uniformly arranged on bulge loop yaw rack in a ring
Several connecting holes, yaw rack lower end are equipped with inwardly projecting installation bulge loop, and off-course brake is mounted on installation bulge loop.
6. the hydraulic sliding bearing formula yaw system of a kind of modularization according to any one of claims 1 to 4, feature
It is that yaw rack outer wall is equipped with two mounting ears being oppositely arranged, several yaw drivings of fastening installation on each mounting ear
Device.
7. the hydraulic sliding bearing formula yaw system of a kind of modularization according to any one of claims 1 to 4, feature
It is that yaw fluted disc outer edge extends outward yaw rack outer edge, yaws and be uniformly arranged several mounting holes on fluted disc, install
Hole is placed in yaw shell outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821661596.XU CN209163995U (en) | 2018-10-12 | 2018-10-12 | A kind of hydraulic sliding bearing formula yaw system of modularization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821661596.XU CN209163995U (en) | 2018-10-12 | 2018-10-12 | A kind of hydraulic sliding bearing formula yaw system of modularization |
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| CN209163995U true CN209163995U (en) | 2019-07-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111042987A (en) * | 2019-12-31 | 2020-04-21 | 新疆金风科技股份有限公司 | Yaw system of wind generating set and replacing method of upper liner |
-
2018
- 2018-10-12 CN CN201821661596.XU patent/CN209163995U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111042987A (en) * | 2019-12-31 | 2020-04-21 | 新疆金风科技股份有限公司 | Yaw system of wind generating set and replacing method of upper liner |
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