Yaw braking system and method for wind driven generator

Abstract

The invention belongs to the technical field of yaw braking, and particularly provides a yaw braking system and method for a wind driven generator, the yaw braking system comprises a cabin and a chassis of the wind driven generator, the chassis is rotatably mounted at the bottom of the cabin through a bearing, the chassis is rotatably driven by a power device, and at least two groups of brake discs positioned on different planes are arranged in the chassis; a plurality of yaw brakes matched with the brake disc are arranged in the cabin, each yaw brake comprises two clamping structures, and two clamped parts corresponding to the clamping structures are arranged on the brake disc, or two sets of brake discs corresponding to the two clamping structures are arranged on the brake disc. The problems that the number of yaw brakes of an existing wind driven generator is insufficient, the yaw brakes cannot be additionally installed, and the braking effect is poor are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of yaw braking, and in particular relates to a yaw braking system and method for a wind turbine generator. Background Art

[0002] Generally, the yaw system of a wind turbine generator consists of a yaw reducer, yaw bearing, yaw brake, yaw brake disc, auxiliary yaw hydraulic system, lubrication system, etc. The yaw reducer provides driving torque for the yaw system, driving the entire wind turbine to achieve yaw to wind and other functions. The yaw brake provides braking torque to prevent the wind turbine from uncontrolled yaw when the wind speed is too high. At the same time, it provides a certain yaw damping torque when unwinding, so that the wind turbine runs smoothly when unwinding. All components of the yaw system are fixed at the bottom of the base.

[0003] The yaw brake is mainly composed of a shell, a hydraulic cylinder inside the shell, a brake friction plate and other structures. The main function of the brake is to push the hydraulic cylinder inside the shell through the hydraulic oil to generate braking force on the brake friction plate. The friction plate converts the thrust into braking force. The friction coefficient of the friction plate is generally around 0.4, and a 1N thrust of the hydraulic cylinder can generate 0.4N of friction braking force.

[0004] Generally, each brake can generate 200KN to 500KN thrust according to different models and sizes. When designing a wind turbine, different models and quantities of brakes are selected as needed. In order to ensure stable braking, more than 4 yaw brakes are generally used. However, the braking effect decreases after long-term use, and more brakes need to be added. However, the original wind turbine design did not reserve more yaw brake installation interfaces, and it was impossible to continue to install a sufficient number of yaw brakes; Multiple yaw brakes rely on the same brake disc, so that the braking force is in the same plane, and damage to the brake disc will affect the overall braking effect, resulting in poor braking effect; The yaw brake needs to replace the brake disc during operation, but the replacement is inconvenient and the replacement efficiency is low. Therefore, the high replacement frequency brings inconvenience to the staff. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a wind turbine yaw brake system and method to solve the problems of insufficient number of yaw brakes of existing wind turbines, inability to install additional brakes and poor braking effect.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a yaw brake system of a wind turbine generator, including a nacelle and a base frame of the wind turbine generator, the base frame is rotatably installed at the bottom of the nacelle through bearings, the base frame is rotationally driven by a power device, at least two groups of brake discs located in different planes are provided in the base frame, and a plurality of yaw brakes cooperating with the brake discs are provided in the nacelle, the yaw brake includes two clamping structures, and the brake disc is provided with two clamped parts corresponding to the clamping structures, or two groups of brake discs are provided corresponding to the two clamping structures.

[0007] In a preferred solution, the power device includes a gear ring arranged on a base frame, and the cabin is provided with a plurality of motors, the output shafts of the motors are connected to gears via connecting shafts, and the gears are meshed with the gear ring.

[0008] In a preferred embodiment, the yaw brake includes two first calipers arranged opposite to each other, a clamping space is formed between the two first calipers, a first connecting seat and a second connecting seat are slidably connected in the two first calipers, the first connecting seat and the second connecting seat are respectively slidably installed in corresponding sliding grooves, and the first connecting seat and the second connecting seat are slidingly sealed with the side walls of the sliding grooves; the two first connecting seats are arranged opposite to each other and cooperate to clamp the brake disc, and the two second connecting seats are arranged opposite to each other and cooperate to clamp the brake disc, two groups of clamping structures correspond to the first connecting seats and the second connecting seats arranged opposite to each other, and a first brake pad is provided on one side of the first connecting seat and the second connecting seat close to the brake disc.

[0009] In a preferred scheme, the sliding groove corresponding to the first connecting seat is connected to the first oil circuit, and the first connecting seat is controlled by the first oil circuit; the sliding groove corresponding to the second connecting seat is connected to the second oil circuit, and the second connecting seat is controlled by the second oil circuit; or, the end of the sliding groove corresponding to the first connecting seat is provided with an oil chamber connected thereto, the first oil circuit is connected with the oil chamber, a sealing chamber is provided at an end of the oil chamber away from the first connecting seat, a connecting hole connected to the sealing chamber is provided in the first caliper, the connecting hole is connected to the sliding groove corresponding to the second connecting seat, and is used to control the sliding of the second connecting seat, a sealing plug is slidably connected in the sealing chamber, a spring is provided between the end of the sealing plug away from the first connecting seat and the end of the sealing chamber, and under the action of the spring, the sealing plug blocks the connecting hole.

[0010] In a preferred solution, grooves are provided on both planes of the brake disc, and the first connecting seat and the second connecting seat are located on both sides of the groove.

[0011] In a preferred solution, a plurality of movable holes are provided in the first caliper, and the movable holes are connected to the sliding grooves corresponding to the first connecting seat or the second connecting seat. The first connecting seat and the second connecting seat are both connected to movable columns, and the movable columns are slidably arranged in the movable holes. A plurality of distance sensors are provided in the first caliper, and the detection ends of the distance sensors are aligned with the ends of the movable columns.

[0012] In a preferred embodiment, the brake disc includes a first brake disc and a second brake disc, a plurality of adapter seats are provided in the cabin, a plurality of mounting holes are provided in the cabin, the mounting holes are adapted to the adapter seats, the adapter seat and the cabin are fixed by a first bolt, and a yaw brake adapted to the second brake disc is installed on the adapter seat.

[0013] In a preferred solution, a third brake disc is further provided in the chassis, and the yaw brake comprises a third caliper and two second calipers, the two second calipers are located on both sides of the third caliper, and two sets of clamping spaces are formed between the two second calipers and the third caliper for clamping the first brake disc and the third brake disc; The two sides of the third caliper are respectively provided with sliding grooves matched with the upper connecting seat and the lower connecting seat, the inner sides of the two second calipers are respectively provided with sliding grooves matched with another group of upper connecting seats and lower connecting seats, the upper connecting seat of the second caliper is arranged opposite to the lower connecting seat of the third caliper, the lower connecting seat of the second caliper is arranged opposite to the upper connecting seat of the third caliper, the upper connecting seat and the lower connecting seat form a clamping mechanism, one group of the clamping mechanisms is used to clamp the first brake disc, and the other group of the clamping mechanisms is used to clamp the third brake disc, and the upper connecting seat and the lower connecting seat are both connected with the second brake pad; The upper connecting seat and the lower connecting seat are both connected to a movable rod at one side away from the second brake pad, and the sliding grooves corresponding to the upper connecting seat and the lower connecting seat in the third caliper and the second caliper are both provided with a piston cavity, a piston is slidably connected in the piston cavity, and the piston is connected to the movable rod; One group of piston chambers connected by the upper connecting seat and the lower connecting seat is connected to the third oil circuit, and a diverter hole is provided on the side of the piston chamber. When the second brake pads corresponding to the upper connecting seat and the lower connecting seat are intact and not worn, the diverter hole is blocked by the piston. After the second brake pad is worn, the diverter hole is not blocked by the piston. The diverter hole connected to the upper connecting seat is connected to the piston chamber corresponding to another upper connecting seat through the fourth oil circuit, and the diverter hole connected to the lower connecting seat is connected to the piston chamber connected to another lower connecting seat through the fifth oil circuit.

[0014] The present invention also provides a braking method for a yaw brake system of a wind turbine generator, wherein a plurality of brake discs and a plurality of yaw brakes are provided, each yaw brake is provided with two clamping structures, and the brake disc is provided with two groups of clamped parts corresponding to the clamping structures, or two groups of brake discs are provided corresponding to the two clamping structures. When in use: S1, one group of clamping structures clamps the corresponding clamped part or the corresponding brake disc to complete braking; S2, when the wear of the clamping structure reaches the rated value or the braking force is insufficient, another set of clamping structures works to clamp the corresponding clamped part or the corresponding brake disc; S3. When the wear of the clamping structure corresponding to a certain group of brake discs reaches the rated value, the yaw brakes corresponding to other brake discs are replaced and started; S4, repeat S1 to S3 to complete the yaw braking of the wind turbine.

[0015] The invention provides a wind turbine yaw braking system and method, which has the following beneficial effects: 1. It is convenient to increase the number of yaw brakes later, thereby ensuring the number of yaw brakes, and there will be no situation where the number is insufficient or cannot be increased, thereby ensuring the braking effect.

[0016] 2. Set up at least two brake discs, so that even if one of the brake discs is damaged, the overall braking effect can still be guaranteed.

[0017] 3. Multiple brake discs make the braking force no longer in the same plane, but a more three-dimensional braking force combination, ensuring stability during braking.

[0018] 4. The replacement cycle of the yaw brake pad is longer, which reduces the frequency of brake pad replacement for workers and reduces work intensity.

[0019] 5. The combination of multiple brake discs and brake structures can adjust the braking mode according to different braking requirements and has better adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the top structure of the yaw brake system of the wind turbine generator of the present invention; Figure 2 It is a schematic diagram of the bottom structure of the yaw brake system of the wind turbine generator of the present invention; Figure 3 is a bottom view of the yaw brake system of the wind turbine generator of the present invention; Figure 4 is a front view of the yaw brake system of the wind turbine generator of the present invention; Figure 5 is a cross-sectional view of the yaw brake system of a wind turbine generator according to the present invention; Figure 6 It is a schematic structural diagram of the yaw brake of the present invention; Figure 7 Schematic diagram of the structure of the embodiment of the yaw brake of the present invention Figure 8 It is a schematic structural diagram of an embodiment of a yaw brake system for a wind turbine according to the present invention; Fig. 91 is a schematic diagram of the structure of an embodiment of a yaw brake of the present invention; Fig.10 1 is a schematic diagram of the structure of an embodiment of a yaw brake of the present invention; In the figure: cabin 1, mounting hole 101; Base frame 2; Power device 3, motor 301, gear 302, gear ring 303, connecting shaft 304; Brake disc 4, first brake disc 401, second brake disc 402, second bolt 403, groove 404, third brake disc 405; Adapter 5, first bolt 501; Yaw brake 6, first caliper 611, first connecting seat 612, first oil circuit 613, second connecting seat 614, second oil circuit 615, first brake pad 616, sealing chamber 617, connecting hole 618, sealing plug 619, spring 620, second caliper 621, third caliper 622, upper connecting seat 623, lower connecting seat 624, second brake pad 625, movable rod 626, piston chamber 627, piston 628, diverter hole 629, third oil circuit 630, fourth oil circuit 631, fifth oil circuit 632, movable hole 633, movable column 634, distance sensor 635, oil chamber 636. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution will be clearly and completely described below in combination with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Embodiment 1: like Figure 1 , 2 As shown in Figures 3, 4 and 5, a yaw brake system of a wind turbine generator comprises a nacelle 1 and a base frame 2 of the wind turbine generator, the nacelle 1 refers to the rotating part of the wind turbine generator in yaw rotation, the base frame 2 refers to the fixed part of the wind turbine generator in yaw rotation, the nacelle 1 and the base frame 2 can rotate relative to each other, the base frame 2 is provided with a gear ring 303, the nacelle 1 is provided with a plurality of motors 301, the output shafts of the motors 301 are connected with gears 302 via connecting shafts 304, the gears 302 are meshed with the gear rings 303; a bearing is provided between the nacelle 1 and the base frame 2, as required, the gear ring 303 is an inner gear ring and is arranged inside the base frame 2, the motor 301 is arranged inside the nacelle 1, the gear ring 303 is also an outer gear ring and is arranged outside the base frame 2, the motor 301 is arranged outside the nacelle 1, and the specific arrangement depends on the actual situation and usage requirements.

[0024] In a preferred embodiment, a first brake disc 401 and a second brake disc 402 are provided in the chassis 2, and the nacelle 1 is provided with a plurality of yaw brakes 6 cooperating with the first brake disc 401; A plurality of adapters 5 are provided in the nacelle 1, and a plurality of yaw brakes 6 cooperating with the second brake disc 402 are provided on the adapter 5. In addition to the original brake disc and yaw brake, the present application adds another brake disc - the second brake disc 402, and increases the installation position of the yaw brake by the adapter 5, which can effectively solve the problem of insufficient braking force caused by insufficient yaw brake of the original wind turbine, and also facilitates the staff to install the yaw brake as needed later; The first brake disc 401 and the second brake disc 402 are arranged in different planes, so that the braking forces are not in the same plane, thereby ensuring the stability during braking and achieving a better braking effect.

[0025] Among them, a plurality of mounting holes 101 are provided in the nacelle 1, and the mounting holes 101 are adapted to the adapter 5 and used to install the adapter 5, and the adapter 5 and the nacelle 1 are fixed by a first bolt 501; The second brake disc 402 is fixed to the base frame 2 via second bolts 403 .

[0026] Embodiment 2: like Figure 6 As shown, the yaw brake 6 includes two first calipers 611 arranged opposite to each other, and the first connecting seat 612 and the second connecting seat 614 are movably connected in the two first calipers 611; The two first connection seats 612 are arranged opposite to each other to cooperate with clamping the brake disc, and the two second connection seats 614 are arranged opposite to each other to cooperate with clamping the brake disc. The first connection seat 612 and the second connection seat 614 respectively clamp different positions of the brake disc without affecting each other, and two sets of clamping structures are arranged on the same yaw brake, so the braking effect is better; A first brake pad 616 is disposed on one side of the first connection seat 612 and the second connection seat 614 close to the brake disc. The first brake pad 616 can be a brake pad commonly used in existing yaw brakes.

[0027] The connection between the first connecting seat 612 and the second connecting seat 614 and the first caliper 611 is sealed, wherein the brake disc is the first brake disc 401 or the second brake disc 402 , that is, the yaw brake 6 can be used for the first brake disc 401 or the second brake disc 402 .

[0028] The first oil circuit 613 controls the first connecting seat 612, and the second oil circuit 615 controls the second connecting seat 614. The first oil circuit 613 and the second oil circuit 615 are both connected to the hydraulic oil tank and the hydraulic control circuit of the prior art, and have an oil inlet pipeline and an oil outlet pipeline. When braking is required, oil is introduced through the oil inlet pipelines of the first oil circuit 613 and the second oil circuit 615 to generate hydraulic pressure, and the hydraulic pressure acts on the first connecting seat 612 and the second connecting seat 614 respectively, so that the first connecting seat 612 and the second connecting seat 614 can be pushed to clamp the brake disc to complete braking. After braking, the hydraulic oil is discharged through the oil outlet pipelines of the first oil circuit 613 and the second oil circuit 615, and the hydraulic pressure is decelerated and is no longer in the braking state. The specific method of oil inlet and oil outlet is the prior art, so it is not repeated here. According to needs, you can choose to use only or alternately use the first connecting seat 612 or the second connecting seat 614. When more braking force is needed, use the first connecting seat 612 and the second connecting seat 614 at the same time. Alternating use can reduce the frequency of use of the first brake pad 616, so that it can be used for a longer time, reduce the frequency of replacement, and reduce work intensity. The simultaneous use of the first connecting seat 612 and the second connecting seat 614 can also increase the braking effect, and when one of them fails, it will not affect the braking effect of the yaw brake 6, and the stability is better.

[0029] Grooves 404 are provided on both end surfaces of the brake disc, and the first connecting seat 612 and the second connecting seat 614 are located on both sides of the groove 404. The waste generated when the brake pad rubs can remain in the groove 404 instead of on the disc surface of the brake disc, thereby preventing the waste from affecting the braking effect.

[0030] Embodiment 3: like Figure 7 As shown, the end of the sliding groove corresponding to the first connecting seat 612 is provided with an oil chamber 636 connected thereto, the first oil circuit 613 is connected to the oil chamber 636, and the end of the oil chamber 636 away from the first connecting seat 612 is provided with a sealing chamber 617, and the first caliper 611 is provided with a connecting hole 618 connected to the sealing chamber 617, and the connecting hole 618 is connected to the sliding groove corresponding to the second connecting seat 614, and is used to control the sliding of the second connecting seat 614, and a sealing plug 619 is slidably connected in the sealing chamber 617, and a spring 620 is provided between the end of the sealing plug 619 away from the first connecting seat 612 and the end of the sealing chamber 617, and under the action of the spring 620, the sealing plug 619 blocks the connecting hole 618.

[0031] The connecting hole 618 is connected to the sealing cavity 617, and the other end is connected to the oil outlet pipeline of the first oil circuit 613. In this embodiment, it is not necessary to use two oil circuits, and only the first oil circuit 613 is used. When a larger braking force is not needed, the hydraulic oil sent into the first oil circuit 613 only generates the required hydraulic pressure. When a larger braking force is needed, the hydraulic pressure increases, and its pressure is greater than the elastic force of the spring 620, which can push the sealing plug 619, so that the connecting hole 618 is no longer blocked by the sealing plug 619, and the hydraulic oil can enter the connecting hole 618, so that the hydraulic pressure can act on the second connecting seat 614, and then the first connecting seat 612 and the second connecting seat 614 work at the same time, forming a larger braking force to meet the braking requirements. Normally, only the first connecting seat 612 is used to work to avoid waste of brake materials. If needed, the first brake pad 616 connected to the first connecting seat 612 can be made thicker.

[0032] Embodiment 4: like Figure 8 and 9 As shown, a third brake disc 405 is further provided in the chassis 2, and the yaw brake 6 includes a third caliper 622 and two second calipers 621, and the two second calipers 621 are located on both sides of the third caliper 622; An upper connecting seat 623 and a lower connecting seat 624 are respectively provided on both sides of the third caliper 622, and an upper connecting seat 623 and a lower connecting seat 624 are respectively provided on the two second calipers 621. The upper connecting seat 623 of the second caliper 621 is arranged opposite to the lower connecting seat 624 of the third caliper 622, and the lower connecting seat 624 of the second caliper 621 is arranged opposite to the upper connecting seat 623 of the third caliper 622, forming two groups of upper connecting seats 623 and lower connecting seats 624, one group of which is used to clamp the first brake disc 401, and the other group of which is used to clamp the third brake disc 405; The upper connecting seat 623 and the lower connecting seat 624 are both connected with a second brake pad 625 , and the second brake pad 625 can be a brake disc commonly used in existing yaw brakes.

[0033] The same brake can cooperate with two brake discs at the same time, that is, cooperate with the first brake disc 401 and the third brake disc 405 at the same time, so that the overall braking effect is better; Furthermore, the two sets of upper connecting seats 623 and lower connecting seats 624 can respectively select to use different oil circuit controls to respectively control the clamping of different brake discs to meet different braking requirements.

[0034] In the preferred embodiment, a movable rod 626 is connected to the side of the upper connecting seat 623 and the lower connecting seat 624 away from the second brake pad 625, and a piston cavity 627 is provided in the third caliper 622 and the second caliper 621, and a piston 628 is slidably connected in the piston cavity 627, and the piston 628 is connected to the movable rod 626.

[0035] A piston cavity 627 connected to one set of the upper connecting seat 623 and the lower connecting seat 624 is connected to the third oil circuit 630. A diverter hole 629 is provided on the side of the piston cavity 627. When the second brake pad 625 is intact, the diverter hole 629 is blocked by the piston 628. After the second brake pad 625 is worn, the diverter hole 629 is not blocked by the piston 628. The diverter hole 629 connected to the upper connecting seat 623 is communicated with the piston chamber 627 connected to another upper connecting seat 623 through the fourth oil circuit 631 , and the diverter hole 629 connected to the lower connecting seat 624 is communicated with the piston chamber 627 connected to another lower connecting seat 624 through the fifth oil circuit 632 .

[0036] When in use, only one oil circuit is needed to connect the oil tank and the control system, that is, the third oil circuit 630 is connected to the existing hydraulic oil tank and the oil circuit control system. When braking is required, oil is introduced into the piston chamber 627 through the third oil circuit 630 to generate oil pressure, and the oil pressure pushes the corresponding upper connecting seat 623 and the lower connecting seat 624 to move and clamp the brake disc to complete braking; With long-term braking, the second brake pad 625 continues to wear. At this time, the piston 628 will move farther, so that the shunt hole 629 is no longer blocked by the piston 628, and the hydraulic oil can enter the fourth oil path 631 and the fifth oil path 632 through the shunt pipe 629, and finally reach the corresponding piston cavity 627. At this time, the oil pressure can act on another set of upper connecting seats 623 and lower connecting seats 624, so that they clamp another brake disc to complete braking. After the second brake pad 625 of the second set of upper connecting seats 623 and lower connecting seats 624 is also worn, the brake pad can be replaced as a whole, thereby extending the replacement cycle of the yaw brake and reducing the work of the staff; The diameter of the movable rod 626 is smaller than that of the piston 628. Fig. 9 As shown, the piston chamber 627 and the piston 628 can limit the sliding range of the upper connecting seat 623 and the lower connecting seat 624, so as to prevent the second brake pad 625 from continuing to clamp the brake disc after being worn to the limit, thereby avoiding damage to the brake disc.

[0037] Embodiment 5: like Fig.10 As shown, this embodiment is combined with embodiments 2 and 4, so that the same yaw brake 6 is not only matched with two brake discs, but each brake disc is also matched with two sets of brake pads, so that the braking effect of the yaw brake system of the wind turbine generator of the present application is better, the control of the braking force is more flexible, and the replacement cycle of the yaw brake is also longer.

[0038] Embodiment 6: A plurality of movable holes 633 are provided in the first caliper 611, and movable columns 634 are connected to the first connection seat 612 and the second connection seat 614. The movable columns 634 are slidably arranged inside the movable holes 633, and the connection between the movable columns 634 and the movable holes 633 is sealed. A plurality of distance sensors 635 are provided in the first caliper 611, and the detection ends of the distance sensors 635 are aligned with the movable columns 634. The distance sensors 635 are preferably infrared sensors, and are connected to an existing control unit, such as a PLC. When in use, the distance sensor 635 first detects the distance between itself and the movable column 634 as the initial distance, and then continuously records the change in distance. When the control unit calculates that the changed distance reaches the rated thickness of the brake pad wear, it sends a signal such as controlling the alarm light to light up. The staff receives the signal and replaces the brake pad if they see the alarm light on.

[0039] Embodiment 7: A yaw braking method for a wind turbine generator, wherein a rated number of yaw brakes 6 directly connected and a newly added yaw brake 6 connected via a transfer structure are arranged on a nacelle 1 of the wind turbine generator, and two brake discs 4 are arranged on a base frame 2 of the wind turbine generator, wherein one brake disc 4 cooperates with the directly connected yaw brake 6 for braking, and the other brake disc 4 cooperates with the newly added yaw brake 6 for braking; In normal conditions, only the directly connected yaw brake 6 is used for braking; After the external wind force exceeds the rated value or the rated number of working time of the yaw brake, the newly added yaw brake 6 works to assist braking.

[0040] By adding brake discs and more yaw brakes, the stability of the yaw brake of the wind turbine after long-term operation is ensured, and more yaw brakes can be connected through the adapter structure adapter 5, which is convenient for subsequent addition of yaw brakes and is no longer restricted by the original installation position.

[0041] In a preferred solution, the yaw brake is provided with two clamping structures, for example, A1 and A2, and the brake disc 4 is provided with two clamped parts, for example, B1 and B2, and the two clamping structures clamp the two clamped parts respectively.

[0042] For example, refer to Figure 6 , wherein A1 and A2 correspond to two sets of first connection seats 612 and second connection seats 614 and corresponding first brake pads 616, respectively, forming two sets of clamping mechanisms. B1 and B2 include two parts on both sides of the groove 404 in the brake disc, namely the inner part and the outer part of the two end surfaces of the brake disc 4. Or, reference Fig. 9The two sets of upper connecting seats 623 and lower connecting seats 624 and the second brake pads 625 connected to the upper connecting seats 623 and the lower connecting seats 624 form two sets of clamping mechanisms. B1 and B2 correspond to two brake discs 4, namely the first brake disc 401 and the third brake disc 405, respectively.

[0043] When using: S1. The clamping structure A1 clamps the corresponding clamped part B1 to complete the braking.

[0044] S2: The wear of the clamping structure A1 reaches the rated value, and the clamping structure A2 works to clamp the corresponding clamped part B2.

[0045] Or the braking force of the clamping structure A1 is insufficient, and the clamping structure A2 works to clamp the corresponding clamped part B2.

[0046] S3. The wear of the clamping structure A1 and the clamping structure A2 reaches the rated value, and the yaw brake is replaced.

[0047] S4, repeat S1-S3 to complete the yaw braking of the wind turbine.

[0048] Through the above method, while ensuring the braking effect, it can adapt to various usage requirements, and the replacement cycle is longer, reducing the labor intensity of the staff.

[0049] Finally, it should be noted that the above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A yaw brake system for a wind turbine generator, comprising a nacelle (1) and a base frame (2) of the wind turbine generator, wherein the base frame (2) is rotatably mounted on the bottom of the nacelle (1) via a bearing, and the base frame (2) is rotatably driven by a power device (3). It is characterized in that At least two groups of brake discs (4) located in different planes are arranged in the chassis (2), and a plurality of yaw brakes (6) cooperating with the brake discs (4) are arranged in the cabin (1), wherein the yaw brakes (6) include two clamping structures, and the brake disc (4) is provided with two clamped parts corresponding to the clamping structures, or two groups of brake discs (4) are arranged corresponding to the two clamping structures.

2. A wind turbine yaw braking system according to claim 1, It is characterized in that The power device comprises a gear ring (303) arranged on a base frame (2), the cabin (1) is provided with a plurality of motors (301), the output shafts of the motors (301) are connected to gears (302) via connecting shafts (304), and the gears (302) are meshed with the gear ring (303).

3. A wind turbine yaw braking system according to claim 1, It is characterized in that The yaw brake (6) comprises two first calipers (611) arranged opposite to each other, a clamping space is formed between the two first calipers (611), a first connecting seat (612) and a second connecting seat (614) are slidably connected in the two first calipers (611), the first connecting seat (612) and the second connecting seat (614) are respectively slidably installed in corresponding sliding grooves, and the first connecting seat (612) and the second connecting seat (614) are slidably sealed with the side walls of the sliding grooves; the two first connecting seats (612) are arranged opposite to each other and cooperate to clamp the brake disc (4), the two second connecting seats (614) are arranged opposite to each other and cooperate to clamp the brake disc (4), the two groups of clamping structures correspond to the first connecting seats (612) and the second connecting seats (614) arranged opposite to each other, and a first brake pad (616) is provided on one side of the first connecting seat (612) and the second connecting seat (614) close to the brake disc (4).

4. A wind turbine yaw braking system according to claim 3, It is characterized in that The sliding groove corresponding to the first connecting seat (612) is connected to the first oil circuit (613), and the first connecting seat (612) is controlled by the first oil circuit (613); the sliding groove corresponding to the second connecting seat (614) is connected to the second oil circuit (615), and the second connecting seat (614) is controlled by the second oil circuit (615); or, the end of the sliding groove corresponding to the first connecting seat (612) is provided with an oil chamber (636) connected thereto, the first oil circuit (613) is connected to the oil chamber (636), and the end of the oil chamber (636) away from the first connecting seat (612) is provided with a sealing The sealing cavity (617) includes a connecting hole (618) in the first caliper (611) and connected to the sealing cavity (617). The connecting hole (618) is connected to a sliding groove corresponding to the second connecting seat (614) and is used to control the sliding of the second connecting seat (614). A sealing plug (619) is slidably connected in the sealing cavity (617). A spring (620) is provided between an end of the sealing plug (619) away from the first connecting seat (612) and an end of the sealing cavity (617). Under the action of the spring (620), the sealing plug (619) blocks the connecting hole (618).

5. A wind turbine yaw braking system according to claim 3, It is characterized in that Both planes of the brake disc (4) are provided with grooves (404), and the first connecting seat (612) and the second connecting seat (614) are located on both sides of the groove (404).

6. A wind turbine yaw braking system according to claim 3, It is characterized in that A plurality of movable holes (633) are provided in the first caliper (611), the movable holes (633) are connected to the sliding grooves corresponding to the first connecting seat (612) or the second connecting seat (614), the first connecting seat (612) and the second connecting seat (614) are both connected to movable columns (634), the movable columns (634) are slidably arranged in the movable holes (633), and a plurality of distance sensors (635) are provided in the first caliper (611), the detection ends of the distance sensors (635) are aligned with the ends of the movable columns (634).

7. A wind turbine yaw braking system according to claim 1, It is characterized in that The brake disc (4) comprises a first brake disc (401) and a second brake disc (402); a plurality of adapter seats (5) are provided in the cabin (1); a plurality of mounting holes (101) are provided in the cabin (1); the mounting holes (101) are adapted to the adapter seats (5); the adapter seats (5) and the cabin (1) are fixed by first bolts (501); and a yaw brake (6) adapted to the second brake disc (402) is mounted on the adapter seats (5).

8. A wind turbine yaw braking system according to claim 7, It is characterized in that A third brake disc (405) is also provided in the chassis (2), and the yaw brake (6) comprises a third caliper (622) and two second calipers (621), the two second calipers (621) being located on both sides of the third caliper (622), and two sets of clamping spaces are formed between the two second calipers (621) and the third caliper (622) for clamping the first brake disc (401) and the third brake disc (405); The third caliper (622) is provided with sliding grooves matching with the upper connecting seat (623) and the lower connecting seat (624) on both sides, and the inner sides of the two second calipers (621) are provided with sliding grooves matching with another group of upper connecting seats (623) and lower connecting seats (624). The upper connecting seat (623) of the second caliper (621) is arranged opposite to the lower connecting seat (624) of the third caliper (622), and the lower connecting seat (624) of the second caliper (621) is arranged opposite to the upper connecting seat (623) of the third caliper (622). The upper connecting seat (623) and the lower connecting seat (624) form a clamping mechanism, one group of the clamping mechanisms is used to clamp the first brake disc (401), and the other group of the clamping mechanisms is used to clamp the third brake disc (405). The upper connecting seat (623) and the lower connecting seat (624) are both connected to the second brake pad (625). The upper connecting seat (623) and the lower connecting seat (624) are both connected to a movable rod (626) on one side away from the second brake pad (625); the sliding grooves corresponding to the upper connecting seat (623) and the lower connecting seat (624) in the third caliper (622) and the second caliper (621) are both provided with a piston cavity (627); a piston (628) is slidably connected in the piston cavity (627); and the piston (628) is connected to the movable rod (626); A piston chamber (627) connected to one group of upper connecting seats (623) and lower connecting seats (624) is connected to a third oil circuit (630), and a shunt hole (629) is provided on the side of the piston chamber (627). When the second brake pads (625) corresponding to the upper connecting seats (623) and the lower connecting seats (624) are intact and unworn, the shunt hole (629) is blocked by the piston (628). After the second brake pads (625) are worn, the shunt hole (629) is not blocked by the piston (628), and the shunt hole (629) connected to the upper connecting seat (623) is communicated with the piston chamber (627) corresponding to another upper connecting seat (623) through a fourth oil circuit (631), and the shunt hole (629) connected to the lower connecting seat (624) is communicated with the piston chamber (627) connected to another lower connecting seat (624) through a fifth oil circuit (632).

9. A braking method for a yaw braking system of a wind turbine generator, It is characterized in that A plurality of sets of brake discs (4) and a plurality of sets of yaw brakes (6) are provided, each set of yaw brakes (6) is provided with two clamping structures, the brake discs (4) are provided with two sets of clamped parts corresponding to the clamping structures, or two sets of brake discs (4) are provided corresponding to the two clamping structures. When in use: S1, one set of clamping structures clamps the corresponding clamped part or the corresponding brake disc (4) to complete braking; S2, when the wear of the clamping structure reaches the rated value or the braking force is insufficient, another set of clamping structures works to clamp the corresponding clamped part or the corresponding brake disc (4); S3, when the wear of the clamping structure corresponding to the brake disc (4) of a certain group reaches a rated value, the yaw brake (6) corresponding to the other brake discs (4) is replaced and activated; S4, repeat S1 to S3 to complete the yaw braking of the wind turbine.

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