A yaw brake device for a land-based wind turbine generator system

Abstract

This invention discloses a yaw braking device for onshore wind turbine generators in the field of wind power generation technology. It includes a tower, a yaw bearing, a brake disc, and multiple braking mechanisms disposed within the inner diameter of the tower. Each braking mechanism comprises two symmetrically arranged braking units, a connecting unit connecting the top ends of the two braking units, and a cleaning unit disposed on the side of each braking unit. This invention utilizes cleaning units on the side of each braking unit to clean dust from the surface of the brake disc. These cleaning units pre-clean the contact area between the friction pads and the brake disc before the braking action, ensuring that the contact area is free of dust. This prevents dust from interfering with the normal braking of the friction pads and brake disc, guaranteeing the braking effect when the friction pads contact the brake disc.

Description

Technical Field

[0001] This invention relates to the field of wind power generation technology, and in particular to a yaw braking device for onshore wind turbine generator sets. Background Technology

[0002] Yaw braking device is a device that uses a hydraulic brake and a yaw bearing to brake a wind turbine. The hydraulic brake works by having a hydraulic piston push a friction plate to continuously contact the end face of the yaw bearing, thereby generating a braking friction torque to complete the braking.

[0003] Among them, the friction pads on the yaw brake device are consumables with a service life of 2 to 5 years. When the friction pads are worn to near the end, they need to be replaced. In the existing technology, the friction pads are mostly set at the bottom of the cylinder along with the piston of the hydraulic cylinder. Due to the rigid connection between the friction pads and the piston rod, when replacing the friction pads, the hydraulic circuit of the hydraulic cylinder can easily be affected through the piston, causing hydraulic oil leakage. This can lead to hydraulic system failure and affect the braking effect.

[0004] Meanwhile, during yaw braking, the friction between the friction pads and the yaw brake disc causes the friction pads to grind out carbon-like powder. Since the existing yaw brake disc is placed horizontally and there is no structure on the brake disc to clean and remove the powder, the powder formed by friction will accumulate on the surface of the brake disc. This powder will enter the gap between the friction pads and the brake disc, interfering with the normal braking of the friction pads and the brake disc, thus causing various unstable operating conditions such as shaking during yaw, abnormal yaw noise, and changes in the coefficient of friction. Summary of the Invention

[0005] In view of the problems existing in the yaw braking devices for onshore wind turbine generators, the present invention proposes a yaw braking device for onshore wind turbine generators to solve such problems.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a yaw braking device for onshore wind turbine generator sets, including a tower body, a yaw bearing, a brake disc, and multiple braking mechanisms disposed in the inner diameter of the tower body. The braking mechanism includes two symmetrically arranged braking units, a connecting unit that connects the top ends of the two braking units together, and a cleaning unit disposed on the side of each braking unit.

[0007] The braking unit includes a main body connected to the lower part of the connecting unit, two sets of cylinders symmetrically arranged on the inner side of the main body, and the two sets of cylinders are respectively located on the upper and lower sides of the brake disc, a piston connected to each set of cylinders, a friction plate arranged on the inner side of each set of pistons, and an oil supply component and a secondary cylinder arranged on the outer side of the main body.

[0008] The cleaning unit includes a fixed component arranged horizontally on the side of the braking unit, a conversion component inserted vertically into the fixed component, two sets of cleaning components arranged on the side of the fixed component, with the two sets of cleaning components respectively attached to the upper and lower sides of the brake disc, and a drive component symmetrically connected to the upper and lower ends of the conversion component.

[0009] As a preferred embodiment of the yaw braking device for onshore wind turbine generators described in this invention, the cylinder body has a hydraulic groove inside, and the piston is installed in the hydraulic groove. The contact surface between the piston and the friction plate has a serrated structure.

[0010] As a preferred embodiment of the yaw braking device for onshore wind turbine generators described in this invention, the bottom of the auxiliary cylinder is connected to the oil supply component, a second connecting groove is provided on the side of the top of the auxiliary cylinder, and a first connecting groove is connected between the hydraulic groove and the second connecting groove.

[0011] As a preferred embodiment of the yaw braking device for onshore wind turbine generators described in this invention, the connecting unit includes an arc-shaped connecting piece, which is connected to the flange faces of two main bodies by multiple sets of bolts. A connecting frame is provided at the top of the connecting piece, and the connecting frame is connected to the inner wall flange face of the tower body by threads in the vertical direction.

[0012] As a preferred embodiment of the yaw braking device for onshore wind turbine generators described in this invention, the fixing component includes a fixing frame laterally connected to the main body, a limiting sleeve disposed on one side of the fixing frame, and a conversion component inserted into the limiting sleeve, pressure plates symmetrically arranged in pairs, with each pair of pressure plates corresponding to a cleaning component, a sliding groove opened on the inner side of each pressure plate, with the cleaning component inserted into the sliding groove, and a limiting groove correspondingly opened above each sliding groove.

[0013] As a preferred embodiment of the yaw braking device for onshore wind turbine generators described in this invention, the conversion component includes two sets of conversion shafts symmetrically inserted into the upper and lower ends of the limiting sleeve, and the two sets of conversion shafts are fixedly connected. A spiral groove with a uniform spiral direction is opened on each set of conversion shafts, and a gear is provided at the end of each set of conversion shafts, and the gear meshes with the inner side of the cleaning component.

[0014] As a preferred embodiment of the yaw braking device for onshore wind turbine generators described in this invention, the cleaning component includes an arc-shaped frame with an arc structure, which meshes with the side of a gear for transmission. The arc-shaped frame is inserted into a sliding groove, a limiting strip is provided on the top surface of the arc-shaped frame and inserted into a limiting groove, and a brush block is provided at the outer end of the arc-shaped frame.

[0015] As a preferred embodiment of the yaw braking device for onshore wind turbine generator sets according to the present invention, the driving component includes a horizontally arranged crossbar, a vertically arranged vertical rod at one end of the crossbar, a push rod vertically arranged at one end of the vertical rod and extending into the auxiliary cylinder, and a collar arranged at the outer end of the crossbar and sleeved on the conversion shaft.

[0016] As a preferred embodiment of the yaw braking device for onshore wind turbine generators described in this invention, the inner wall of the driving component is provided with multiple sets of balls, and the distribution orientation of the balls is consistent with the helical angle of the helical groove.

[0017] As a preferred embodiment of the yaw braking device for onshore wind turbine generators described in this invention, the brake disc includes multiple sets of arc-shaped brake pads, slots at both ends of the brake pads, and multiple sets of brake pads connected end to end through the slots to form a ring structure, as well as multiple sets of equally spaced chip removal holes on the brake pads.

[0018] The beneficial effects of this invention are as follows: The friction plate and piston are designed separately to prevent the friction plate from affecting the piston during disassembly. At the same time, the contact surface between the friction plate and the piston is serrated. Compared with the rectangular contact surface, the serrated contact surface increases the rigid friction force between the two. The serrated structure can also provide a further reverse limiting force in the circumferential direction, thereby making the connection between the friction plate and the piston tighter and the braking effect of the braking mechanism better.

[0019] The braking operation is performed by a double-sided, double-cylinder braking unit. The double-sided, double-cylinder braking unit can simultaneously form braking surfaces on the upper and lower surfaces of the brake disc, resulting in a stronger braking effect. The braking unit is connected to the inner wall of the wind tower via connecting plates and connecting frames. The connecting plates and connecting frames can provide load support during the braking process from the circumferential and vertical directions, respectively, thereby effectively transferring the braking stress to the tower body and effectively offsetting the shear force of the braking force on the bolts during the braking process, ensuring the safety of the braking unit during installation and operation.

[0020] By reconfiguring the brake disc to work with the braking unit, the new brake disc is composed of multiple arc-shaped brake pads. By connecting the brake disc to the yaw bearing, the brake disc can replace the yaw bearing to bear the braking force, so that the yaw bearing no longer participates in yaw braking, which greatly improves its service life. At the same time, the brake disc composed of multiple brake pads can be replaced and assembled by replacing the pieces. When damaged, only the damaged brake pad needs to be replaced, which effectively reduces the difficulty and cost of brake disc maintenance.

[0021] By installing a cleaning unit on the side of each braking unit to clean the dust on the surface of the brake disc, the cleaning unit can clean the contact area between the friction pad and the brake disc before the braking unit performs the braking action, so that there is no dust at the contact area, preventing dust from interfering with the normal braking of the friction pad and the brake disc, and ensuring the braking effect when the friction pad and the brake disc are in contact. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used 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 those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0023] Figure 1 This is a schematic diagram of the overall structure of the yaw braking device for onshore wind turbine generators according to the present invention.

[0024] Figure 2 This is a schematic diagram of the braking mechanism of the yaw braking device for onshore wind turbine generators according to the present invention.

[0025] Figure 3 This is a schematic diagram of the internal structure of the braking mechanism of the yaw braking device for onshore wind turbine generators according to the present invention.

[0026] Figure 4 This is a schematic diagram of the braking unit of the yaw braking device for onshore wind turbine generators according to the present invention.

[0027] Figure 5 This is a schematic diagram of the piston and friction plate of the yaw braking device for onshore wind turbine generators according to the present invention.

[0028] Figure 6 This is a schematic diagram of the cleaning unit of the yaw braking device for onshore wind turbine generators according to the present invention.

[0029] Figure 7 This is a schematic diagram of the structure of the fixed component of the yaw braking device for onshore wind turbine generators according to the present invention.

[0030] Figure 8 This is a schematic diagram of the yaw braking device conversion component for onshore wind turbine generators according to the present invention.

[0031] Figure 9 This is a schematic diagram of the cleaning component of the yaw braking device for onshore wind turbine generators according to the present invention.

[0032] Figure 10 This is a schematic diagram of the drive component of the yaw braking device for onshore wind turbine generators according to the present invention.

[0033] Figure 11 This is a top view of the initial state of the cleaning unit of the yaw braking device for onshore wind turbine generators according to the present invention.

[0034] Figure 12 This is a schematic diagram of the brake disc of the yaw braking device for onshore wind turbine generators according to the present invention.

[0035] Reference numerals: 1. Tower body; 2. Yaw bearing; 3. Brake disc; 31. Brake pad; 32. Slot; 33. Chip removal hole; 4. Braking unit; 41. Main body; 411. Connecting groove one; 42. Cylinder body; 421. Hydraulic groove; 43. Piston; 44. Friction plate; 45. Oil supply component; 46. Auxiliary cylinder; 461. Connecting groove two; 5. Connecting unit; 51. Connecting piece; 52. Connecting frame; 6. Cleaning unit; 61. Fixed... Fixed component; 611, fixed frame; 612, limiting sleeve; 613, pressure plate; 614, slide groove; 615, limiting groove; 62, conversion component; 621, conversion shaft; 622, spiral groove; 623, gear; 63, cleaning component; 631, arc frame; 632, limiting strip; 633, brush block; 64, drive component; 641, horizontal bar; 642, vertical bar; 643, push rod; 644, collar; 645, ball bearing. Detailed Implementation

[0036] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0037] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0038] Reference Figures 1-12 This invention includes a yaw braking device for an onshore wind turbine generator set, comprising a tower body 1, a yaw bearing 2, a brake disc 3, and multiple braking mechanisms disposed on the inner diameter of the tower body 1. The braking mechanism includes two symmetrically arranged braking units 4, a connecting unit 5 connecting the top ends of the two braking units 4, and a cleaning unit 6 disposed on the side of each braking unit 4. The multiple braking units 4 are evenly distributed around the brake disc 3, and can evenly apply braking force at different positions on the brake disc 3. The brake disc 3 is fixedly connected to the yaw bearing 2. By limiting the brake disc 3 through the braking units 4, the braking and limiting of the yaw bearing 2 can be achieved.

[0039] Reference Figure 4The braking unit 4 includes a main body 41 connected to the lower part of the connecting unit 5, two sets of cylinders 42 symmetrically arranged inside the main body 41, and the two sets of cylinders 42 are respectively located on the upper and lower sides of the brake disc 3, a piston 43 connected to each set of cylinders 42, a friction pad 44 arranged inside each set of pistons 43, and an oil supply component 45 and a secondary cylinder 46 arranged on the outer side of the main body 41. Each set of cylinders 42 is connected to its corresponding piston 43. The braking unit 4 is a hydraulic clamp structure with strong braking effect. It can push the friction pad 44 to abut against the brake disc 3. Therefore, the braking unit 4 can simultaneously brake and limit the brake disc 3 from both the upper and lower sides. By performing braking operation through the double-sided double-cylinder braking unit 4, braking surfaces can be formed on the upper and lower surfaces of the brake disc 3 at the same time, resulting in a stronger braking effect.

[0040] Reference Figure 6 The cleaning unit 6 includes a fixing component 61 horizontally disposed on the side of the braking unit 4, a conversion component 62 vertically inserted into the fixing component 61, two sets of cleaning components 63 disposed on the side of the fixing component 61, and the two sets of cleaning components 63 respectively attached to the upper and lower sides of the brake disc 3, and a driving component 64 symmetrically connected to the upper and lower ends of the conversion component 62. The cleaning components 63 are attached to the outer wall of the brake disc 3 and can clean and push the residual powder on the brake disc 3 by moving on the brake disc 3. The fixing component 61 limits and holds the cleaning components 63 as a whole on the side of the brake disc 3.

[0041] Furthermore, refer to Figure 3 The cylinder body 42 has a hydraulic groove 421 inside, and the piston 43 is installed in the hydraulic groove 421. The contact surface between the piston 43 and the friction plate 44 has a serrated structure. The piston 43 and the friction plate 44 are designed separately and are connected by bolts. The friction plate 44 is connected to the hydraulic groove 421 through the piston 43. Therefore, the friction plate 44 does not have a direct contact with the hydraulic groove 421, so the friction plate 44 has little impact on the hydraulic groove 421. By designing the friction plate 44 and the piston 43 separately, it can effectively prevent the friction plate 44 from affecting the piston 43 during disassembly. At the same time, the serrated structure of the contact surface between the friction plate 44 and the piston 43 increases the rigid friction force between them compared with the rectangular contact surface. The serrated structure can also provide a further reverse limiting force in the circumferential direction, thereby making the connection between the friction plate 44 and the piston 43 tighter and improving the overall braking effect of the braking mechanism.

[0042] Furthermore, refer to Figure 3The bottom of the auxiliary cylinder 46 is connected to the oil supply component 45. A second connecting groove 461 is provided on the side of the top of the auxiliary cylinder 46. A first connecting groove 411 connects the hydraulic groove 421 and the second connecting groove 461. The oil supply component 45 will prioritize injecting hydraulic oil into the bottom of the auxiliary cylinder 46 through the connection with the bottom of the auxiliary cylinder 46. When the hydraulic oil is injected into the second connecting groove 461 at the top of the auxiliary cylinder 46, it will be transported into the hydraulic groove 421 through the first connecting groove 411, thereby pushing the piston 43 and the friction plate 44 in the cylinder body 42 to perform braking operation. Therefore, it can be seen that during the process of hydraulic oil injection, the action of the auxiliary cylinder 46 pushing the drive component 64 takes precedence over the action of the cylinder body 42 pushing the piston 43.

[0043] Among them, reference Figure 4 The connecting unit 5 includes an arc-shaped connecting piece 51, which is connected to the flange faces of two main bodies 41 by multiple sets of bolts. A connecting frame 52 is set at the top of the connecting piece 51, and the connecting frame 52 is connected to the inner wall flange face of the tower body 1 by threads in the vertical direction. The radius of curvature of the arc of the connecting piece 51 matches the annular structure of the brake disc 3. The way the connecting piece 51 is connected to the flange face of the main body 41 by bolts will make the two form a smooth load transfer interface. The arc structure follows the principle of minimum potential energy, and naturally forms a uniform stress distribution when subjected to circumferential tension. At the same time, the bending stiffness of the connecting piece 51 effectively resists the tangential shear force generated when the brake disc 3 rotates, avoids stress abrupt change at the right angle connection, and achieves the purpose of reducing the bending stress peak at the connection node between the main body 41 and the connecting piece 51, thereby slowing down the fatigue crack propagation rate around the bolt hole.

[0044] Furthermore, refer to Figure 4 The connecting frame 52, which is vertically connected to the tower body 1, can provide a reverse force from the vertical direction. Through cooperation with the connecting piece 51, the connecting unit 5 as a whole can provide load support from the circumferential direction and the vertical direction respectively, thereby effectively transferring the braking stress to the tower body and effectively offsetting the shear force of the braking force on the bolts during the braking process, ensuring the safety of the braking unit 4 during installation and operation.

[0045] Among them, reference Figure 7The fixing component 61 includes a fixing frame 611 laterally connected to the main body 41, a limiting sleeve 612 disposed on one side of the fixing frame 611, and a conversion component 62 inserted into the limiting sleeve 612, pressure plates 613 symmetrically arranged in pairs, with each pair of pressure plates 613 corresponding to a pair of cleaning components 63, a sliding groove 614 opened inside each pair of pressure plates 613, with the cleaning component 63 inserted into the sliding groove 614, and a limiting groove 615 correspondingly opened above each pair of sliding grooves 614. The fixing component 61 is fixed by limiting the movement of the pressure plate 611. The sleeve 612 and the pressure plate 613 respectively limit the conversion component 62 and the cleaning component 63. The conversion component 62 can rotate axially on the limiting sleeve 612. The inner arc of the sliding groove 614 of the two sets of pressure plates 613 fits with the arc of the cleaning component 63, and the arc of the cleaning component 63 fits with the circumferential arc of the brake disc 3. Therefore, the cleaning component 63 can fit under the limitation of the sliding groove 614 without slipping off the brake disc 3, thereby ensuring that the cleaning component 63 can effectively rub and clean the brake disc 3.

[0046] Among them, reference Figure 8 The conversion component 62 includes two sets of conversion shafts 621 symmetrically inserted into the upper and lower ends of the limiting sleeve 612, and the two sets of conversion shafts 621 are fixedly connected. A spiral groove 622 with a uniform spiral direction is opened on each set of conversion shafts 621, and a gear 623 is provided at the upper end of each set of conversion shafts 621. The gear 623 meshes with the inner side of the cleaning component 63. When the conversion component 62 rotates, it can drive the gear 623 to rotate. The rotating gear 623 can push the cleaning component 63 to move and extend by meshing with the cleaning component 63.

[0047] Furthermore, refer to Figure 9 The cleaning component 63 includes an arc-shaped frame 631 with an arc structure, which meshes with the side of the gear 623 for transmission. The arc-shaped frame 631 is inserted into the slide groove 614. A limiting strip 632 is provided on the top surface of the arc-shaped frame 631 and is inserted into the limiting groove 615. A brush block 633 is provided on the outer end of the arc-shaped frame 631. The arc-shaped frame 631 is located in the slide groove 614 through the cooperation of the limiting strip 632 and the limiting groove 615. When the gear 623 meshes and pushes the arc-shaped frame 631, the arc-shaped frame 631 can drive the brush block 633 to move on the brake disc 3. The surface of the brush block 633 that contacts the brake disc 3 is provided with bristles, which can sweep away the residual powder on the brake disc 3.

[0048] Among them, reference Figure 10The drive component 64 includes a horizontally arranged crossbar 641, a vertically arranged vertical rod 642 at one end of the crossbar 641, a push rod 643 vertically arranged at one end of the vertical rod 642 and extending into the auxiliary cylinder 46, and a collar 644 arranged at the outer end of the crossbar 641 and sleeved on the conversion shaft 621. The auxiliary cylinder 46 can hydraulically push the push rod 643 to extend outward. The outwardly extending push rod 643 can drive the drive component 64 to move upward as a whole. The upwardly moving drive component 64 can drive the conversion component 62 to rotate.

[0049] Furthermore, refer to Figure 10 Multiple sets of balls 645 are provided on the inner wall of the drive component 64, and the distribution of the balls 645 is consistent with the helical angle of the helical groove 622. The balls 645 that are consistent with the helical angle of the helical groove 622 can be fitted into the helical groove 622. When the collar 644 moves along the conversion component 62, the balls 645 will apply a vertical thrust to the conversion component 62 as a whole through the helical groove 622. Since the conversion component 62 is limited on the limiting sleeve 612 by the gear 623, the vertical thrust applied by the collar 644 to the conversion component 62 through the balls 645 will be converted into a force that pushes the conversion component 62 to rotate as a whole through the helical angle of the helical groove 622.

[0050] Furthermore, refer to Figure 12 The brake disc 3 includes multiple sets of arc-shaped brake pads 31, grooves 32 at both ends of the brake pads 31, and multiple sets of brake pads 31 connected end to end through the grooves 32 to form a ring structure, as well as multiple sets of equally spaced chip removal holes 33 on the brake pads 31. The chip removal holes 33 are used to remove debris accumulated on the brake disc 3. The brake disc 3 is reconfigured to cooperate with the brake unit 4 for braking operation. The new brake disc 3 is assembled from multiple arc-shaped brake pads 31. By connecting the brake disc 3 to the yaw bearing 2, the brake disc 3 can replace the yaw bearing 2 to bear the braking force, so that the yaw bearing 2 no longer participates in yaw braking, which greatly improves its service life. At the same time, the brake disc 3 composed of multiple brake pads 31 can be replaced and assembled by replacing the pieces. When damaged, only the damaged brake pads 31 need to be replaced, which effectively reduces the difficulty and cost of brake disc 3 maintenance.

[0051] During use, refer to Figure 12In normal operation, the cleaning component 63 is located directly below the friction plate 44. When the braking mechanism needs to perform braking operation, the oil supply component 45 injects hydraulic oil into the auxiliary cylinder 46. The hydraulic oil injected into the auxiliary cylinder 46 first pushes the push rod 643 to extend vertically. The outwardly extending push rod 643 drives the entire drive component 64 to move. At this time, the collar 644 on the drive component 64 applies a vertical thrust to the entire conversion component 62 through the cooperation of the ball bearing 645 and the spiral groove 622. Since the conversion component 62 is limited on the limiting sleeve 612 by the gear 623, the vertical thrust applied to the conversion component 62 by the collar 644 through the ball bearing 645 is converted into a force that pushes the entire conversion component 62 to rotate through the spiral groove 622. The rotating conversion component 62 is driven by the meshing of the gear 623 and the arc frame 631, pushing the entire cleaning component 63 to rotate during braking. The cleaning component 63 moves on the disc 3, and the moving cleaning component 63 drives the brush block 633 to pass over the part where the friction pad 44 and the brake disc 3 are to contact, thereby cleaning the powder at the contact point. As hydraulic oil is continuously injected, the drive component 64 will continuously drive the cleaning component 63 to move through the conversion component 62, and finally make the cleaning component 63 completely detach from the friction pad 44 and the brake disc 3, thereby avoiding the friction pad 44 and the brake disc 3 from braking friction. By providing a cleaning unit 6 on the side of each brake unit 4 to clean the dust on the surface of the brake disc 3, and the cleaning unit 6 can clean the contact point between the friction pad 44 and the cleaning unit 6 before the brake unit 4 performs the braking action, so that there is no dust at the contact point, preventing the powder from interfering with the normal braking of the friction pad 44 and the cleaning unit 6, and ensuring the braking effect when the friction pad 44 and the cleaning unit 6 are in contact.

[0052] When the oil supply component 45 pushes the push rod 643 in the auxiliary cylinder 46 to its outward extension limit by injecting oil, the cleaning unit 6 is in the cleaning completed state, that is, the cleaning component 63 is completely separated from the friction plate 44 and the brake disc 3. At this time, the hydraulic oil will be delivered to the hydraulic groove 421 through the connection between the second connecting groove 461 and the first connecting groove 411, thereby pushing the piston 43 to contact the friction plate 44 and the brake disc 3, thereby realizing the yaw braking operation.

[0053] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A yaw brake device for a land-based wind turbine generator unit, comprising a tower (1), a yaw bearing (2), a brake disc (3) and a plurality of brake mechanisms arranged at an inner diameter portion of the tower (1), characterized in that: The brake mechanism comprises two groups of symmetrically arranged brake units (4), a connecting unit (5) connected to the top ends of the two groups of brake units (4), and a cleaning unit (6) arranged on the side of each group of brake units (4); The brake unit (4) comprises a main body (41) connected below the connecting unit (5), two groups of cylinder bodies (42) symmetrically arranged on the inner side of the main body (41), and the two groups of cylinder bodies (42) are respectively located on the upper and lower sides of the brake disc (3), a piston (43) connected in each group of cylinder bodies (42), a friction plate (44) arranged on the inner side of each group of pistons (43), and an oil supply component (45) and a sub-cylinder (46) arranged on the outer side of the main body (41); The cleaning unit (6) comprises a fixed component (61) transversely arranged on the side of the brake unit (4), a conversion component (62) vertically inserted on the fixed component (61), two groups of cleaning components (63) arranged on the side of the fixed component (61), and the two groups of cleaning components (63) are respectively attached to the upper and lower sides of the brake disc (3), and a driving component (64) symmetrically connected to the upper and lower ends of the conversion component (62); The fixed component (61) comprises a fixed frame (611) transversely connected with the main body (41), a limiting sleeve (612) arranged on one side of the fixed frame (611), and the conversion component (62) is inserted on the limiting sleeve (612), two groups of symmetrically arranged pressing plates (613), and the two groups of pressing plates (613) are respectively corresponding to the two groups of cleaning components (63), a sliding groove (614) opened on the inner side of each group of pressing plates (613), and the cleaning component (63) is inserted in the sliding groove (614), and a limiting groove (615) is correspondingly opened above each group of sliding grooves (614); The conversion component (62) comprises two groups of symmetrically inserted conversion shafts (621) on the upper and lower ends of the limiting sleeve (612), and the two groups of conversion shafts (621) are fixedly connected, a spiral groove (622) is opened on each group of conversion shafts (621), and the spiral groove (622) is uniformly helical, and a gear (623) is arranged on the distal end of each group of conversion shafts (621), and the gear (623) is engaged with the inner side of the cleaning component (63); The cleaning component (63) comprises an arc-shaped frame (631) with an arc-shaped structure, and the arc-shaped frame (631) is engaged with the side of the gear (623) for transmission, and the arc-shaped frame (631) is inserted in the sliding groove (614), a limiting strip (632) is arranged on the top surface of the arc-shaped frame (631), and the limiting strip (632) is inserted in the limiting groove (615), and a brush block (633) is arranged on the outer end of the arc-shaped frame (631).

2. The yaw brake arrangement for a land based wind turbine generator unit as claimed in claim 1 wherein: The inside of the cylinder body (42) is provided with a hydraulic groove (421), and the piston (43) is installed in the hydraulic groove (421), and the fitting surface between the piston (43) and the friction plate (44) is a sawtooth structure.

3. The yaw brake arrangement for a land based wind turbine generator unit as claimed in claim 2 wherein: The bottom of the sub-cylinder (46) is communicated with the oil supply component (45), the top end side of the sub-cylinder (46) is provided with a communication groove two (461), and the hydraulic groove (421) and the communication groove two (461) are connected with a communication groove one (411).

4. The yaw brake arrangement for a land based wind turbine generator unit as claimed in claim 3 wherein: The connecting unit (5) comprises a connecting sheet (51) in arc structure, and the connecting sheet (51) is connected with the flange faces of the two groups of main bodies (41) through a plurality of groups of bolts; a connecting frame (52) is arranged at the top end of the connecting sheet (51) and is connected with the inner wall flange face of the tower body (1) in the vertical direction through bolts.

5. The yaw brake arrangement for onshore wind turbine generators as claimed in claim 1 wherein: The driving component (64) comprises a horizontal rod (641) arranged horizontally, a vertical rod (642) arranged vertically at one end of the horizontal rod (641), a push rod (643) arranged vertically at one end of the vertical rod (642) and extending into the auxiliary cylinder (46), and a sleeve ring (644) arranged at the outer end of the horizontal rod (641) and sleeved on the conversion shaft (621).

6. The yaw brake arrangement for a land based wind turbine generator unit as claimed in claim 5 wherein: A plurality of groups of rolling balls (645) are arranged on the inner wall of the driving component (64), and the distribution direction of the rolling balls (645) is consistent with the spiral angle of the spiral groove (622).

7. The yaw brake arrangement for onshore wind turbine generators as claimed in claim 1 wherein: The brake disc (3) comprises a plurality of groups of brake sheets (31) in arc structure, clamping grooves (32) opened at both ends of the brake sheets (31), a plurality of groups of brake sheets (31) connected in a ring structure through the clamping grooves (32) in a head-to-tail mode, and a plurality of groups of chip removal holes (33) uniformly opened on the brake sheets (31).

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