A wind turbine generator set pitch drive mechanism and method

Abstract

The present invention provides a variable pitch drive mechanism and method for a wind turbine generator set, and relates to the field of wind power generation. The variable pitch drive mechanism of the wind turbine generator set includes a hub, wherein a blade bearing is arranged in the hub; a blade member, wherein the blade member is installed in the hub through the blade bearing, and the root of the blade member is concentrically fixedly connected with an extension column; a variable pitch drive mechanism, wherein the variable pitch drive mechanism includes a support plate fixedly installed in the hub, wherein a variable pitch reducer is fixedly installed on the side of the support plate away from the blade member, and the output end of the variable pitch reducer is fixedly connected with a variable pitch drive gear through the support plate; and a force stabilizing mechanism. The variable pitch drive mechanism and the force stabilizing mechanism provided can not only stably complete the variable pitch operation, but also increase the force points of the variable pitch driven gear after the variable pitch operation, thereby improving the service life of the variable pitch driven gear, increasing the overall reliability, and reducing the cost of later maintenance.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to a variable pitch drive mechanism and method for a wind generator set. Background Art

[0002] Wind turbines usually have a pitch mechanism, which realizes the rotation of the blades through a motor, a reducer and a transmission mechanism (such as gear meshing). The motor output shaft is coaxially connected to the reduction gearbox. After the reducer increases the torque of the motor to an appropriate multiple, it transmits the torque to the rotating part of the blade root pitch bearing through a transmission method, thereby driving the blades to rotate and achieve pitch control. As one of the core parts of the control system of large wind turbines, the pitch system plays a very important role in the safe, stable and efficient operation of the unit. Stable pitch control has become one of the hot spots and difficulties in the current research on control technology of large wind turbines. In simple terms, pitch control technology is to change the angle of attack of the airflow on the blades by adjusting the pitch angle of the blades, thereby controlling the aerodynamic torque and aerodynamic power captured by the wind rotor.

[0003] In the prior art, the gear-driven variable pitch system is a set of variable pitch actuators, in which the variable pitch motor drives the variable pitch reducer, the variable pitch reducer drives the variable pitch output gear to rotate, the variable pitch output gear drives the variable pitch bearing to rotate, and the variable pitch bearing drives the blade to pitch. The variable pitch drive wheel is an external tooth, the variable pitch bearing is an internal tooth, and the blade is fixed to the variable pitch bearing by bolts. When the variable pitch is fixed, the wind will generate a force on the meshing point of the variable pitch output gear and the variable pitch bearing, and the meshing surface of the variable pitch output gear and the variable pitch bearing is small, and the force surface is small, which easily causes the variable pitch output gear to wear seriously, thereby affecting the reliability of the variable pitch, increasing the maintenance cost, and being unfavorable to the operation of the wind turbine generator set. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides a wind turbine pitch drive mechanism and method, which solves the problem that in a fixed state, wind force reacts on the pitch output gear, causing severe wear of the pitch output gear, affecting the reliability of the pitch, increasing maintenance costs, and being detrimental to the operation of the wind turbine.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: A variable pitch drive mechanism for a wind turbine generator set, comprising:

[0008] A wheel hub, wherein a blade bearing is arranged in the wheel hub;

[0009] A blade member, wherein the blade member is installed in the hub through a blade bearing, and an extension column is fixedly connected concentrically at the root of the blade member;

[0010] A pitch drive mechanism, the pitch drive mechanism comprising a support plate fixedly mounted in the hub, a pitch reducer fixedly mounted on a side of the support plate away from the blade member, an output end of the pitch reducer passing through the support plate and fixedly connected to a pitch drive gear, a gear ring member is mounted on the support plate through a rotating assembly, a ring tooth portion is provided on the inner side of the gear ring member, the pitch drive gear meshes with the ring tooth portion of the gear ring member, a pitch driven gear is provided on the inner side of the gear ring member, the ring tooth portion of the gear ring member meshes with the pitch driven gear, and the pitch driven gear is fixedly connected to the end face of the extension column;

[0011] A force stabilizing mechanism, the force stabilizing mechanism comprising an electric push rod fixedly mounted on a support plate, an output end of the electric push rod passing through the support plate and fixedly connected with a locking member, the locking member being capable of locking a pitch driven gear;

[0012] The lubrication mechanism, after being squeezed by the upward movement of the locking part, produces a quantitative lubricant that flows vertically downward. Through the provision of the variable pitch drive mechanism and the force stabilization mechanism, the variable pitch operation can be stably completed, and the force points of the variable pitch driven gear can be increased after the variable pitch, thereby increasing the service life of the variable pitch driven gear, increasing the overall reliability, and not requiring frequent maintenance in the later stage, thereby reducing the cost of later maintenance; through the provision of the lubrication mechanism, the force stabilization mechanism can be used to control the falling of the lubricating oil, thereby achieving the purpose of lubricating the variable pitch drive gear, the variable pitch driven gear, and the gear ring, reducing the wear during the variable pitch, and increasing the overall service life.

[0013] Preferably, reinforcing ribs are fixedly connected between the extension column and the blade member, and the reinforcing ribs are evenly arranged around the circumference. The reinforcing ribs are used to provide firmness of the connection between the extension column and the blade member and improve the overall bearing capacity.

[0014] Preferably, the side of the gear ring part close to the support plate is fixedly connected to the bottom plate, and the rotating assembly includes a ring slide rail fixedly mounted on the bottom plate, a self-rotating shaft, a bearing sleeve and a ring rail seat fixedly mounted on the support plate, the self-rotating shaft is mounted in the bearing sleeve through a bearing, and the ring slide rail and the ring rail seat are slidably matched. The rotating assembly ensures the stability of the rotation of the gear ring part, reduces the friction of the rotation of the gear ring part, and at the same time increases the limiting force of the gear ring part on the variable pitch driven gear, ensuring the stability of the variable pitch driven gear in the locked state.

[0015] Preferably, the locking member includes a locking plate fixedly mounted on the output end of the electric push rod, a reserved opening being provided on the locking plate, a locking block being fixedly connected to the lower portion of the reserved opening, a locking tooth being engaged with the pitch driven gear being provided on the inner side of the locking block, a locking arc block and a locking arc member being fixedly connected to a side of the locking block close to the support plate, a driving plate being fixedly connected to a side of the locking plate close to the force stabilizing mechanism, and a driving hole being provided in the driving plate.

[0016] Preferably, the locking arc block and the circumferential surface of the gear ring member are in contact with each other, the locking arc member and the ring groove are matched with each other, and a guide rod is fixedly connected to the locking plate, and the guide rod passes through the support plate and is slidably matched with each other. The locking arc block, the locking arc member and the locking teeth can provide multi-position restrictions for the variable pitch driven gear, ensuring the stability of the variable pitch driven gear in the locked state.

[0017] Preferably, the lubrication mechanism comprises a fixed plate fixedly mounted on the inner wall of the wheel hub and an oil tank, the lower part of the fixed plate is fixedly connected to a piston rod, the lower part of the piston rod is slidably connected to a lubrication cylinder, the bottom of the lubrication cylinder is fixedly connected to a lubrication pipe head, the oil tank and the lower part of the lubrication cylinder are interconnected through a flexible liquid extraction pipe, the flexible liquid extraction pipe and the lubrication pipe head are both provided with a one-way valve, and the rod body of the piston rod is sleeved with a reset tension spring. The one-way valve is used to prevent the lubricating oil in the lubrication pipe head from flowing back from bottom to top, and the lubricating oil in the flexible liquid extraction pipe flows back from the lubrication cylinder to the oil tank.

[0018] Preferably, the lubrication pipe head is conical and is located directly above the pitch drive gear. The lubrication pipe head can pass through the drive hole. The piston rod member includes an operating rod and a piston head. The operating rod is fixedly connected to the piston head, and the piston head is located in the lubrication cylinder.

[0019] A pitch changing method using the above-mentioned pitch changing drive mechanism of a wind turbine generator set comprises the following steps:

[0020] S1. The electric push rod drives the locking part to move, so that the locking part is separated from the gear ring part and the pitch driven gear;

[0021] S2. The pitch reducer drives the pitch drive gear to rotate, the pitch drive gear drives the gear ring to rotate, the gear ring drives the pitch driven gear to rotate, and the pitch driven gear drives the extension column and the blade member to rotate to the required angle;

[0022] S3. The electric push rod drives the locking part to move, so that the locking part is fully engaged with the gear ring part and the pitch driven gear to complete the pitch operation.

[0023] (III) Beneficial effects

[0024] The present invention provides a variable pitch drive mechanism and method for a wind turbine generator set, which has the following beneficial effects:

[0025] 1. The present invention can stably complete the pitch change operation by providing a pitch drive mechanism and a force stabilizing mechanism, and can also increase the force points of the pitch driven gear after the pitch change, thereby improving the service life of the pitch driven gear and increasing the overall reliability. Frequent maintenance is not required in the later stage, thereby reducing the cost of later maintenance.

[0026] 2. The lubrication mechanism provided in the present invention can utilize the force stabilizing mechanism to control the falling of the lubricating oil, thereby achieving the purpose of lubricating the variable pitch driving gear, the variable pitch driven gear, and the gear ring, reducing the wear during the variable pitch, and increasing the overall service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is an overall stereogram of the present invention;

[0028] Figure 2 It is a partial stereogram of the present invention in a disassembled state;

[0029] Figure 3 A three-dimensional view of the gear ring of the present invention from a bottom perspective;

[0030] Figure 4 A three-dimensional view of the gear ring of the present invention from an upper perspective;

[0031] Figure 5 A three-dimensional diagram of a support plate portion of the present invention;

[0032] Figure 6 A perspective view of a blade member of the present invention;

[0033] Figure 7 A three-dimensional view of a support plate portion of the present invention from a bottom perspective;

[0034] Figure 8 A bottom perspective view of the locking member of the present invention;

[0035] Fig. 9 A bottom perspective view of the lubrication mechanism of the present invention;

[0036] Fig.10 It is a cross-sectional view of the lubrication cylinder part of the present invention.

[0037] Among them, 1, wheel hub; 101, blade bearing; 2, blade member; 3, pitch drive mechanism; 4, force stabilization mechanism; 5, lubrication mechanism; 201, reinforcing rib; 202, extension column; 301, support plate; 3011, bearing sleeve; 3012, ring rail seat; 302, gear ring member; 3021, ring groove; 3022, ring tooth portion; 3023, bottom plate; 3024, ring slide; 3025, rotation shaft; 303, pitch drive gear; 304, pitch driven gear; 305, pitch reducer speed machine; 401, locking member; 402, guide rod; 403, electric push rod; 4011, locking plate; 4012, locking arc block; 4013, locking arc member; 4014, locking block; 4015, locking tooth; 4016, reserved opening; 4017, drive plate; 4018, drive hole; 501, fixing plate; 502, piston rod member; 503, lubrication cylinder; 504, lubrication pipe head; 505, flexible liquid extraction pipe; 506, one-way valve; 507, oil tank; 508, reset spring. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

[0039] like Figure 1-Figure 10 As shown, an embodiment of the present invention provides a wind turbine generator set pitch drive mechanism, comprising:

[0040] A hub 1, wherein a blade bearing 101 is provided in the hub 1;

[0041] refer to Figure 1 The blade bearing 101 facilitates the rotation of the blade member 2 and reduces the friction of the pitch change.

[0042] The blade member 2 is installed in the hub 1 through the blade bearing 101. The root of the blade member 2 is concentrically fixedly connected with an extension column 202. A reinforcing rib 201 is fixedly connected between the extension column 202 and the blade member 2. The reinforcing rib 201 is evenly arranged around the circumference.

[0043] refer to Figure 6 The radius of the extension column 202 is smaller than the radius of the blade member 2 , thus greatly reducing the difficulty of producing the variable pitch driven gear 304 , facilitating production and manufacturing, and the reinforcing rib 201 improves the firmness of the connection between the extension column 202 and the blade member 2 .

[0044] The pitch drive mechanism 3 includes a support plate 301 fixedly installed in the hub 1, a pitch reducer 305 is fixedly installed on the side of the support plate 301 away from the blade member 2, the output end of the pitch reducer 305 is fixedly connected to the pitch drive gear 303 through the support plate 301, a gear ring member 302 is installed on the support plate 301 through a rotating assembly, a side of the gear ring member 302 close to the support plate 301 is fixedly connected to a bottom plate 3023, a ring tooth portion 3022 is provided on the inner side of the gear ring member 302, the pitch drive gear 303 is meshed with the ring tooth portion 3022 of the gear ring member 302, a pitch driven gear 304 is provided on the inner side of the gear ring member 302, the ring tooth portion 3022 of the gear ring member 302 is meshed with the pitch driven gear 304, and the pitch driven gear 304 is fixedly connected to the end face of the extension column 202;

[0045] refer to Figure 2 , Figure 7 , the pitch reducer 305 is energized to drive the pitch drive gear 303 to rotate, the pitch drive gear 303 drives the gear ring 302 to rotate, the gear ring 302 drives the pitch driven gear 304 to rotate, thereby driving the extension column 202 and the blade member 2 to rotate to the required angle to achieve the pitch function. The gear ring 302 is easier to produce than the traditional pitch bearing. The pitch driven gear 304 can provide pitch transmission while ensuring the stability of the blade member 2 pitch. The minimum rotation amount of the pitch driven gear 304 is the tooth pitch, which ensures that the locking tooth 4015 can always engage with the pitch driven gear 304. An angular displacement sensor can be installed on the side of the pitch driven gear 304 away from the support plate 301 to detect the angular displacement. The operation of the pitch reducer 305 is controlled by the controller, and the sensor and controller can be freely selected according to needs.

[0046] The rotating assembly includes a ring slide 3024 fixedly mounted on the bottom plate 3023, a rotation shaft 3025, a bearing sleeve 3011 fixedly mounted on the support plate 301, and a ring rail seat 3012. The rotation shaft 3025 is mounted in the bearing sleeve 3011 through a bearing, and the ring slide 3024 is slidably matched with the ring rail seat 3012.

[0047] refer to Figure 3 , Figure 4 , Figure 5 The rotation shaft 3025 and the ring slide rail 3024 can ensure the stable rotation of the gear ring 302 and improve the strength of the gear ring 302 structure.

[0048] The force stabilizing mechanism 4 includes an electric push rod 403 fixedly mounted on the support plate 301, the output end of the electric push rod 403 passes through the support plate 301 and is fixedly connected to a locking member 401, the locking member 401 includes a locking plate 4011 fixedly mounted on the output end of the electric push rod 403, a reserved opening 4016 is provided on the locking plate 4011, a locking block 4014 is fixedly connected to the lower part of the reserved opening 4016, a locking tooth 4015 engaged with the pitch driven gear 304 is provided on the inner side of the locking block 4014, and the locking block 4014 is close to the support plate A locking arc block 4012 and a locking arc piece 4013 are fixedly connected to one side of 301. The locking arc block 4012 contacts the circumferential surface of the gear ring 302. The locking arc piece 4013 cooperates with the annular groove 3021. A guide rod 402 is fixedly connected to the locking plate 4011. The guide rod 402 passes through the support plate 301 and is slidably matched with each other. A driving plate 4017 is fixedly connected to the side of the locking plate 4011 close to the force stabilizing mechanism 4. A driving hole 4018 is provided in the driving plate 4017. The locking piece 401 can lock the variable pitch driven gear 304.

[0049] refer to Figure 7 , Figure 8 When in the locked state, the electric push rod 403 is energized to work, driving the locking plate 4011 to approach the gear ring part 302, the locking arc block 4012 and the circumferential surface of the gear ring part 302 are in contact with each other, the locking arc part 4013 is stuck in the ring groove 3021, increasing the friction between the locking plate 4011 and the gear ring part 302, and the locking tooth 4015 is stuck in the variable pitch driven gear 304, thereby restricting and locking the variable pitch driven gear 304; when in the unlocked state, the electric push rod 403 is energized to work, driving the locking plate 4011 away from the gear ring part 302, the locking arc block 4012, the locking arc part 4013, and the locking tooth 4015 are away from the variable pitch driven gear 304. At this time, the variable pitch driven gear 304 can rotate normally, which is convenient for the variable pitch action.

[0050] The lubrication mechanism 5 is a lubrication mechanism that generates a quantitative amount of lubricating liquid vertically downward after being squeezed by the locking member 401. The lubrication mechanism 5 includes a fixed plate 501 fixedly mounted on the inner wall of the hub 1 and an oil tank 507. The lower part of the fixed plate 501 is fixedly connected to a piston rod 502, and the lower part of the piston rod 502 is slidably connected to a lubrication cylinder 503. The bottom of the lubrication cylinder 503 is fixedly connected to a lubrication pipe head 504. The oil tank 507 is connected to the lower part of the lubrication cylinder 503 through a flexible liquid extraction pipe 505. Both the flexible liquid extraction pipe 505 and the lubrication pipe head 504 are provided with a one-way valve 506. A reset spring 508 is sleeved on the rod body of the piston rod 502. The lubrication pipe head 504 is conical and is located directly above the pitch drive gear 303. The lubrication pipe head 504 can pass through the drive hole 4018. The piston rod 502 includes an operating rod and a piston head. The operating rod is fixedly connected to the piston head, and the piston head is located in the lubrication cylinder 503.

[0051] refer to Fig. 9 , Fig.10 During lubrication, firstly, the blade member 2 that needs lubrication is rotated to the top of the hub 1, and the electric push rod 403 in the unlocked state is energized to work, so that its output end is further raised to drive the driving plate 4017, close to the lubrication cylinder 503, so that the lubrication cylinder 503 moves upward, and the distance between the piston rod member 502 and the bottom of the lubrication cylinder 503 becomes smaller, and the squeezed lubricating oil passes through the one-way valve 506 and falls from the lubrication pipe head 504, and drips onto the pitch drive gear 303, which is used to reduce the friction between the pitch drive gear 303 and the gear ring member 302 during the pitch action. When the driving plate 4017 moves down to the locked state again, the stretched reset spring 508 drives the piston rod member 502 to move upward again, and the lubricating oil in the oil tank 507 is drawn from the flexible liquid extraction pipe 505 through the one-way valve 506 into the lubrication cylinder 503, thereby facilitating the next lubrication operation.

[0052] The embodiment of the present invention further provides a pitch changing method using the pitch changing drive mechanism of the wind turbine generator set, comprising the following steps:

[0053] S1. The electric push rod 403 drives the locking member 401 to move, so that the locking member 401 is separated from the gear ring member 302 and the pitch driven gear 304;

[0054] S2. The pitch reducer 305 drives the pitch drive gear 303 to rotate, the pitch drive gear 303 drives the gear ring 302 to rotate, the gear ring 302 drives the pitch driven gear 304 to rotate, and the pitch driven gear 304 drives the extension column 202 and the blade member 2 to rotate to the required angle;

[0055] S3. The electric push rod 403 drives the locking member 401 to move, so that the locking member 401 is fully engaged with the gear ring member 302 and the pitch driven gear 304, and the pitch operation is completed.

[0056] Working principle: When changing the pitch, firstly, the force stabilizing mechanism 4 is changed to the unlocked state, and the electric push rod 403 is powered on to work, driving the locking plate 4011 away from the gear ring 302, the locking arc block 4012, the locking arc member 4013, and the locking tooth 4015 away from the pitch driven gear 304. At this time, the pitch driven gear 304 can rotate normally to facilitate the pitch action. When lubrication is required, the blade member 2 that needs lubrication is first rotated to the top of the hub 1, and the electric push rod 403 in the unlocked state is powered on to work, so that its output end is further raised to drive the driving plate 4017, close to the lubrication cylinder 503, so that the lubrication cylinder 503 moves up, and the piston rod The distance between the component 502 and the bottom of the lubrication cylinder 503 becomes smaller, and the squeezed lubricating oil falls from the lubrication pipe head 504 through the one-way valve 506 and drips onto the pitch drive gear 303, which is used to reduce the friction between the pitch drive gear 303 and the gear ring component 302 during the pitch action. When the drive plate 4017 moves down to the locked state again, the stretched reset spring 508 drives the piston rod component 502 to move up again, and the lubricating oil in the oil tank 507 is drawn from the flexible suction pipe 505 through the one-way valve 506 into the lubrication cylinder 503, thereby facilitating the next lubrication operation, and then the pitch reducer 305 is energized to drive the pitch drive gear 303 The gear ring 302 is rotated, and the pitch driving gear 303 drives the gear ring 302 to rotate, and the gear ring 302 drives the pitch driven gear 304 to rotate, thereby driving the extension column 202 and the blade member 2 to rotate to the required angle to realize the pitch function; then the force stabilizing mechanism 4 is transformed into the locked state, and the electric push rod 403 is energized to work, driving the locking plate 4011 to approach the gear ring 302, the locking arc block 4012 and the circumferential surface of the gear ring 302 contact each other, and the locking arc member 4013 is stuck in the annular groove 3021, thereby increasing the friction between the locking plate 4011 and the gear ring 302, and the locking tooth 4015 is stuck in the pitch driven gear 304 to realize the pitch control. The present invention limits and locks the paddle driven gear 304 by providing a pitch drive mechanism 3 and a force stabilizing mechanism 4, which can not only stably complete the pitch operation, but also increase the force points of the pitch driven gear 304 after the pitch is changed, thereby improving the service life of the pitch driven gear 304 and increasing the overall reliability, without the need for frequent maintenance in the later stage, thereby reducing the cost of later maintenance; through the provided lubrication mechanism 5, the force stabilizing mechanism 4 can be used to control the falling of the lubricating oil, thereby achieving the purpose of lubricating the pitch drive gear 303, the pitch driven gear 304, and the gear ring 302, reducing the wear during the pitch change and improving the overall service life.

[0057] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A variable pitch drive mechanism for a wind turbine generator set, characterized in that: include: A wheel hub (1), wherein a blade bearing (101) is arranged inside the wheel hub (1); A blade member (2), the blade member (2) being installed in the hub (1) via a blade bearing (101), and the root of the blade member (2) being concentrically fixedly connected with an extension column (202); A pitch drive mechanism (3), the pitch drive mechanism (3) comprising a support plate (301) fixedly mounted in a hub (1), a pitch reducer (305) fixedly mounted on a side of the support plate (301) away from the blade member (2), an output end of the pitch reducer (305) passing through the support plate (301) and fixedly connected to a pitch drive gear (303), a gear ring member (302) mounted on the support plate (301) via a rotating assembly, an upper portion of the gear ring member (302) A ring groove (3021) is provided, a ring tooth portion (3022) is provided on the inner side of the gear ring member (302), the pitch drive gear (303) is meshed with the ring tooth portion (3022) of the gear ring member (302), a pitch driven gear (304) is provided on the inner side of the gear ring member (302), the ring tooth portion (3022) of the gear ring member (302) and the pitch driven gear (304) are meshed with each other, and the pitch driven gear (304) is fixedly connected to the end surface of the extension column (202); A force stabilizing mechanism (4), the force stabilizing mechanism (4) comprising an electric push rod (403) fixedly mounted on a support plate (301), an output end of the electric push rod (403) passing through the support plate (301) and fixedly connected to a locking member (401), the locking member (401) being capable of locking the variable pitch driven gear (304); A lubricating mechanism (5) is provided, wherein the lubricating mechanism (5) is squeezed upward by the locking member (401) to produce a quantitative lubricating liquid flowing vertically downward.

2. A wind turbine generator set pitch drive mechanism according to claim 1, characterized in that: A reinforcing rib (201) is fixedly connected between the extension column (202) and the blade member (2), and the reinforcing rib (201) is evenly arranged around the circumference.

3. A wind turbine generator set pitch drive mechanism according to claim 1, characterized in that: The gear ring member (302) is fixedly connected to a bottom plate (3023) on one side thereof close to the support plate (301); the rotating assembly comprises a ring slide rail (3024) fixedly mounted on the bottom plate (3023), a rotation shaft (3025), a bearing sleeve (3011) and a ring rail seat (3012) fixedly mounted on the support plate (301); the rotation shaft (3025) is mounted in the bearing sleeve (3011) via a bearing, and the ring slide rail (3024) is slidably matched with the ring rail seat (3012).

4. A wind turbine generator set pitch drive mechanism according to claim 1, characterized in that: The locking member (401) comprises a locking plate (4011) fixedly mounted on the output end of the electric push rod (403); a reserved opening (4016) is provided on the locking plate (4011); a locking block (4014) is fixedly connected to the lower part of the reserved opening (4016); a locking tooth (4015) engaged with the pitch driven gear (304) is provided on the inner side of the locking block (4014); a locking arc block (4012) and a locking arc member (4013) are fixedly connected to a side of the locking block (4014) close to the support plate (301); a driving plate (4017) is fixedly connected to a side of the locking plate (4011) close to the force stabilizing mechanism (4); a driving hole (4018) is provided in the driving plate (4017).

5. A wind turbine generator set pitch drive mechanism according to claim 4, characterized in that: The locking arc block (4012) and the circumferential surface of the gear ring member (302) are in contact with each other, the locking arc member (4013) and the annular groove (3021) are matched with each other, and a guide rod (402) is fixedly connected to the locking plate (4011), and the guide rod (402) passes through the support plate (301), and they are slidably matched with each other.

6. A wind turbine generator set pitch drive mechanism according to claim 1, characterized in that: The lubrication mechanism (5) comprises a fixed plate (501) fixedly mounted on the inner wall of the wheel hub (1) and an oil tank (507); the lower part of the fixed plate (501) is fixedly connected to a piston rod (502); the lower part of the piston rod (502) is slidably connected to a lubrication cylinder (503); the bottom of the lubrication cylinder (503) is fixedly connected to a lubrication pipe head (504); the oil tank (507) and the lower part of the lubrication cylinder (503) are interconnected via a flexible liquid extraction pipe (505); both the flexible liquid extraction pipe (505) and the lubrication pipe head (504) are provided with a one-way valve (506); and the rod body of the piston rod (502) is sleeved with a return tension spring (508).

7. A wind turbine generator set pitch drive mechanism according to claim 6, characterized in that: The lubrication pipe head (504) is conical and is located directly above the pitch drive gear (303). The lubrication pipe head (504) can pass through the drive hole (4018). The piston rod (502) includes an operating rod and a piston head. The operating rod is fixedly connected to the piston head. The piston head is located in the lubrication cylinder (503).

8. A pitch changing method of a wind turbine generator set using the pitch changing drive mechanism according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. The electric push rod (403) drives the locking member (401) to move, so that the locking member (401) is separated from the gear ring member (302) and the pitch driven gear (304); S2, the pitch reducer (305) drives the pitch drive gear (303) to rotate, the pitch drive gear (303) drives the gear ring (302) to rotate, the gear ring (302) drives the pitch driven gear (304) to rotate, and the pitch driven gear (304) drives the extension column (202) and the blade member (2) to rotate to a required angle; S3. The electric push rod (403) drives the locking member (401) to move, so that the locking member (401) is completely engaged with the gear ring member (302) and the pitch-changing driven gear (304), thereby completing the pitch-changing operation.

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