Flexible wind wheel locking device for typhoon-resistant wind turbine braking system

Abstract

The present invention discloses a flexible wind wheel locking device for a typhoon-resistant wind turbine generator braking system, which adopts a flexible wind wheel locking design scheme, including a swinging trolley and two flexible wind wheel locking units; the two flexible wind wheel locking units are symmetrically distributed on the left and right sides of the front flange of the gear box, and are connected to the left and right ends of the swinging trolley; the swinging trolley and the outer shell of the wind wheel locking pin assembly of the braking system are integrally formed, and can move in the arc-shaped guide rail slot of the front flange of the gear box, drive the steel wire rope group on the left or right side to tighten, and at the same time drive the guide column in the flexible wind wheel locking unit on one side to be pulled out, so that the spring set on the guide column is compressed, thereby providing a restoring force for the wind wheel. The present invention allows the wind wheel to swing within a certain angle, and the greater the angle deviates from the positive "Y" position, the greater the restoring force, which can greatly reduce the load of the wind wheel and the whole machine, and greatly reduce the overall design difficulty of the wind turbine generator set.

Description

Technical Field

[0001] The present invention relates to the technical field of brake system design for typhoon-resistant wind turbine generator sets, and in particular to a flexible wind wheel locking device for a brake system for typhoon-resistant wind turbine generator sets, which locks the wind wheel in typhoon-resistant working conditions so that the wind wheel can only swing within a certain angle range along the transmission axis and provides appropriate torsional stiffness. Background Art

[0002] It is well known in the industry that megawatt-class three-blade typhoon-resistant wind turbines generally use variable pitch control to feather the three blades, and the wind rotor is free to idle to avoid excessive load on the whole machine. For three-blade typhoon-resistant wind turbines, after feathering the three blades, the wind rotor needs to be locked in a horizontal position of the blades to minimize the load on the wind turbine. When the wind rotor rotates, the wind load on the wind rotor changes at different angles. When the wind rotor is in the positive "Y" direction, that is, when one of the blades is vertically downward, the wind load on the wind rotor is small. However, if the wind rotor is completely locked, the unbalanced load of the wind rotor cannot be released, which will significantly increase the instantaneous limit load of the wind turbine. Especially for downwind typhoon-resistant wind turbines, the existing technology is to completely release or completely lock the wind rotor, resulting in a large load on the whole machine at the typhoon limit wind speed. In addition, for the design of downwind three-blade typhoon-resistant wind turbines, the wind rotor is free to rotate at no load to resist the typhoon, and the wind rotor load will increase greatly. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art. Aiming at the problem that the existing typhoon-resistant wind turbine generator sets completely lock or completely release the wind wheel, resulting in a heavy load on the entire unit, a flexible wind wheel locking device for the braking system of a typhoon-resistant wind turbine generator set is proposed. A flexible wind wheel locking design scheme is adopted to allow the wind wheel to swing within a certain angle and provide a restoring force for the wind wheel. The greater the angle deviation from the positive "Y" position, the greater the restoring force, which can greatly reduce the load on the wind wheel and the entire machine, greatly reducing the overall design difficulty of the wind turbine generator set.

[0004] To achieve the above-mentioned purpose, the technical solution provided by the present invention is: a flexible wind rotor locking device for a typhoon-resistant wind turbine braking system, the braking system of the wind turbine comprising a wind rotor locking disk, a front end flange of a gear box, and a wind rotor locking pin assembly, the wind rotor locking disk is fixed to the hub of the wind rotor by bolts, the front end flange of the gear box is a part of the gear box of the wind turbine, and is respectively fixed to the generator and the nacelle shell of the wind turbine by bolts, the wind rotor locking pin assembly comprises a wind rotor locking pin and a driving device for driving the wind rotor locking pin to extend or retract, under the action of the driving device, the wind rotor locking pin can extend into the locking hole on the wind rotor locking disk, thereby locking the wind rotor locking disk. The wind wheel is locked; the flexible wind wheel locking device includes a swinging trolley and two flexible wind wheel locking units; wherein, the upper half of the front end flange of the gear box is formed with an arc-shaped guide rail slot extending along its circumference, and the left and right parts of the arc-shaped guide rail slot are mirror-symmetrical about the vertical center line of the front end flange of the gear box; the swinging trolley is installed in the arc-shaped guide rail slot and can only move in the arc-shaped guide rail slot, and the wind wheel locking pin assemblies have two arranged in the arc-shaped guide rail slot and located on the left and right sides of the swinging trolley, and the shells of the two wind wheel locking pin assemblies are respectively connected to the left and right ends of the swinging trolley to form a whole, so that after the wind wheel locking pin extends out to lock the wind wheel, the rotation of the wind wheel can drive the two wind wheel locking pins to lock the wind wheel. The pin assembly moves with the swinging trolley within the angle range limited by the arc guide rail slot; the two flexible wind wheel locking units are symmetrically distributed on the left and right sides of the front end flange of the gear box, and correspond to the two wind wheel locking pin assemblies, that is, one wind wheel locking pin assembly is equipped with one flexible wind wheel locking unit; the flexible wind wheel locking unit includes a wire rope group, a fixed pulley, a movable pulley, a guide column, a support seat, a first spring, a partition, a second spring, a spring end plate and a guide column end plate, the support seat is fixed to the lower half of the front end flange of the gear box, the fixed pulley is fixed on the front end flange of the gear box, and is located between the arc guide rail slot and the support seat, the movable pulley is placed between the fixed pulley and the support seat, and is installed on the top of the guide column, and the bottom of the guide column is vertical After passing through the support seat, partition plate, and spring end plate downward in sequence, it is fixedly connected to the guide column end plate, and the guide column end plate is used to prevent the guide column from separating from the spring end plate. The first spring is placed between the support seat and the partition plate, and is sleeved on the guide column, and its two ends are respectively connected to the support seat and the partition plate. The second spring is placed between the partition plate and the spring end plate, and is sleeved on the guide column, and its two ends are respectively connected to the partition plate and the spring end plate. The partition plate and the spring end plate can slide on the guide column, one end of the wire rope group is fixedly connected to the outer shell of the corresponding wind wheel locking pin assembly, and the other end of the wire rope group is downwardly wound around the fixed pulley and the movable pulley in sequence, and then upwardly connected to the front end flange of the gear box and close to the fixed pulley, and the gravity of the guide column and the guide column end plate is used to tighten the wire rope group.

[0005] Furthermore, the spatial distance between the support seat and the movable pulley is greater than the total stroke of the first spring and the second spring, so that when the movable pulley moves downward, the wire rope group is always tightened.

[0006] Furthermore, springs not mounted on the guide columns are connected between the support seat and the partition plate and between the partition plate and the spring end plate to increase the restoring force.

[0007] Furthermore, the swing trolley adopts double-layer double-row conical rolling wheels, which can withstand the additional bending moment generated on the wind wheel locking pin assembly.

[0008] Furthermore, buffers are installed at the extreme positions at both ends of the arc-shaped guide rail slot to reduce the impact force generated when the wind wheel locking assembly swings to the extreme position; and the two wind wheel locking pin assemblies are spaced 60° apart.

[0009] Another technical solution provided by the present invention is: a flexible wind rotor locking device for a typhoon-resistant wind turbine braking system, wherein the braking system of the wind turbine comprises a wind rotor locking disk, a front end flange of a gear box, and a wind rotor locking pin assembly, wherein the wind rotor locking disk is fixed to the hub of the wind rotor by bolts, the front end flange of the gear box is a part of the gear box of the wind turbine, and is respectively fixed to the generator and the nacelle shell of the wind turbine by bolts, the wind rotor locking pin assembly comprises a wind rotor locking pin and a driving device for driving the wind rotor locking pin to extend or retract, and under the action of the driving device, the wind rotor locking pin can extend into the locking hole on the wind rotor locking disk, thereby locking the wind rotor by locking the wind rotor locking disk; the flexible wind rotor locking device The device comprises a swing trolley and two flexible wind wheel locking units; wherein, the upper half of the front end flange of the gear box is formed with an arc-shaped guide rail slot extending along its circumference, and the left and right parts of the arc-shaped guide rail slot are mirror-symmetrical about the vertical center line of the front end flange of the gear box; the swing trolley is installed in the arc-shaped guide rail slot and can only move in the arc-shaped guide rail slot, and one of the wind wheel locking pin assemblies is placed in the arc-shaped guide rail slot and is located on one side of the swing trolley, and the shell of the wind wheel locking pin assembly is connected to one end of the swing trolley to form a whole, so that after the wind wheel locking pin extends out to lock the wind wheel, the rotation of the wind wheel can drive the wind wheel locking pin assembly to move with the swing trolley within the angle range limited by the arc-shaped guide rail slot; the two flexible wind wheel locks The fixed units are symmetrically distributed on the left and right sides of the front end flange of the gear box; the flexible wind wheel locking unit includes a wire rope group, a fixed pulley, a movable pulley, a guide column, a support seat, a first spring, a partition, a second spring, a spring end plate and a guide column end plate. The support seat is fixed to the lower half of the front end flange of the gear box, the fixed pulley is fixed to the front end flange of the gear box, and is located between the arc guide rail slot and the support seat, the movable pulley is placed between the fixed pulley and the support seat, and is installed on the top of the guide column, the bottom of the guide column vertically downward passes through the support seat, the partition, and the spring end plate in turn, and is fixedly connected to the guide column end plate, and the guide column end plate is used to prevent the guide column from being separated from the spring end plate, the first spring is placed between the support seat and the partition, and is sleeved on the guide column, and its The two ends are respectively connected to the support seat and the partition, the second spring is placed between the partition and the spring end plate, and is mounted on the guide column, and its two ends are respectively connected to the partition and the spring end plate, and the partition and the spring end plate can slide on the guide column; one end of the wire rope group of one flexible wind wheel locking unit is fixedly connected to the outer shell of the wind wheel locking pin assembly, and the other end of the wire rope group is downwardly wound around the fixed pulley and the movable pulley in sequence, and then upwardly connected to the front end flange of the gear box, and close to the fixed pulley, and the gravity of the guide column and the guide column end plate is used to tighten the wire rope group; one end of the wire rope group of another flexible wind wheel locking unit is connected to the other end of the swing trolley, and the other end of the wire rope group is downwardly wound around the fixed pulley and the movable pulley in sequence, and then upwardly connected to the front end flange of the gear box, and close to the fixed pulley.

[0010] Furthermore, the spatial distance between the support seat and the movable pulley is greater than the total stroke of the first spring and the second spring, so that when the movable pulley moves downward, the wire rope group is always tightened.

[0011] Furthermore, springs not mounted on the guide columns are connected between the support seat and the partition plate and between the partition plate and the spring end plate to increase the restoring force.

[0012] Furthermore, the swing trolley adopts double-layer double-row conical rolling wheels, which can withstand the additional bending moment generated on the wind wheel locking pin assembly.

[0013] Furthermore, buffers are installed at the extreme positions of both ends of the arc-shaped guide rail slot to reduce the impact force generated when the wind wheel locking assembly swings to the extreme position.

[0014] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0015] 1. The present invention adopts a flexible wind wheel locking design scheme, which allows the wind wheel to swing within a certain angle, such as ±30°, and provides a restoring force for the wind wheel. The greater the angle deviates from the positive "Y" position, the greater the restoring force. Before the typhoon arrives during typhoon resistance conditions, the wind wheel is locked in the positive "Y" position where the blade force is the smallest, allowing the wind wheel to swing within a certain angle, such as ±27°, after the typhoon arrives. After the wind wheel is blown away from the positive "Y" position by the typhoon, when the wind force decreases, the wind wheel can return to the positive "Y" position, that is, the position with the smallest load, thereby significantly reducing the load of the entire machine under typhoon conditions.

[0016] 2. Since the flexible wind wheel locking device of the present invention is related to the safe operation of the wind turbine generator set, it requires very high reliability; therefore, the present invention adopts a mechanical structure composed of a spring and a wire rope group to achieve the flexible wind wheel locking function, avoiding the use of complex electrical and hydraulic devices, that is, there is no complex electrical and hydraulic structure, and the reliability is very high.

[0017] 3. The spring can be designed according to the requirements of the wind wheel locking limit torque and restoring force, and different locking stiffnesses can be designed to meet the load design requirements of the whole machine.

[0018] 4. The present invention provides an effective solution for reducing the design load of the downwind three-blade typhoon-resistant unit by reducing the locking stiffness of the wind wheel.

[0019] 5. Since the present invention directly locks the hub side of the wind wheel without passing through the gear box of the wind turbine generator set, it will not cause damage to the gear box, thereby improving the reliability of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the installation of the flexible wind wheel locking device in Example 1.

[0021] Figure 2 This is the front view of the flexible wind wheel locking device in Example 1.

[0022] Figure 3 This is an axial view of the flexible wind wheel locking device in Example 1.

[0023] Figure 4 This is a cross-sectional view of the swing trolley in Example 1 after being installed in the arc guide rail slot.

[0024] Figure 5 This is the front view of the flexible wind wheel locking device in Example 2. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with specific embodiments.

[0026] Example 1

[0027] The flexible wind wheel locking device provided in this embodiment is mainly used in the braking system of a typhoon-resistant wind turbine generator set, such as Figure 1 As shown, the braking system includes a wind rotor locking disk 6, a front end flange 3 of a gear box, and a wind rotor locking pin assembly 2. The wind rotor locking disk 6 is fixed to the hub 8 of the wind rotor (not shown in the figure) by bolts. The front end flange 3 of the gear box is a part of the gear box of the wind turbine generator set, and is respectively fixed to the generator (not shown in the figure) and the nacelle shell 7 of the wind turbine generator set by bolts. The wind rotor locking pin assembly 2 includes a wind rotor locking pin 201 and a driving device (not shown in the figure) for driving the wind rotor locking pin 201 to extend or retract. When the wind rotor needs to be locked, the locking hole on the wind rotor locking disk 6 is first aligned with the wind rotor locking pin 201, and then the wind rotor locking pin 201 is extended into the locking hole on the wind rotor locking disk 6, thereby locking the wind rotor by locking the wind rotor locking disk 6, so that the flexible wind rotor locking device takes effect.

[0028] See also Figures 1 to 3As shown, the flexible wind wheel locking device described in this embodiment includes a swinging trolley 1 and two flexible wind wheel locking units 5; wherein, an arc-shaped guide rail slot hole 4 extending along its circumference is formed on the upper half of the front end flange 3 of the gear box, and the left and right parts of the arc-shaped guide rail slot hole 4 are mirror-symmetrical about the vertical center line of the front end flange 3 of the gear box; the swinging trolley 1 is installed in the arc-shaped guide rail slot hole 4 and can only move in the arc-shaped guide rail slot hole 4, and the wind wheel locking pin assembly 2 has two parts placed in the arc-shaped guide rail slot hole 4 and located on the left and right sides of the swinging trolley 1, and the shells of the two wind wheel locking pin assemblies 2 are respectively connected to the left and right ends of the swinging trolley 1 to form a whole, so that when the wind wheel lock After the fixed pin 201 extends out to lock the wind wheel, the rotation of the wind wheel can drive the two wind wheel locking pin assemblies 2 to move with the swinging trolley 1 within the angle range limited by the arc guide slot 4, and buffers are installed at the extreme positions at both ends of the arc guide slot 4 (according to the shape of the arc guide slot 4, rubber pads or rubber springs are customized to buffer the wind wheel locking assembly 2 when it swings to the extreme position. Of course, buffers of other elastic materials or spring types can also be used) to reduce the impact force generated when the wind wheel locking assembly 2 swings to the extreme position; the two flexible wind wheel locking units 5 are symmetrically distributed on the left and right sides of the front flange of the gear box, and correspond to the two wind wheel locking pin assemblies 2, that is, one wind wheel locking pin assembly 2 is equipped with one A flexible wind wheel locking unit 5; the flexible wind wheel locking unit 5 includes a wire rope group 501, a fixed pulley 502, a movable pulley 503, a guide column 504, a support seat 505, a first spring 506, a partition 507, a second spring 508, a spring end plate 509 and a guide column end plate 510, the support seat 505 is fixed to the lower half of the front end flange 3 of the gear box, the fixed pulley 502 is fixed on the front end flange 3 of the gear box, and is located between the arc guide rail slot 4 and the support seat 505, the movable pulley 503 is placed between the fixed pulley 502 and the support seat 505, and is installed on the top of the guide column 504, and the bottom of the guide column 504 vertically downward passes through the support seat 505, the partition 507 and the second spring 508 in sequence. 07. The spring end plate 509 is fixedly connected to the guide column end plate 510, and the guide column end plate 510 prevents the guide column 504 from being separated from the spring end plate 509. The first spring 506 is placed between the support seat 505 and the partition plate 507, and is sleeved on the guide column 504, and its two ends are respectively connected to the support seat 505 and the partition plate 507. The second spring 508 is placed between the partition plate 507 and the spring end plate 509, and is sleeved on the guide column 504, and its two ends are respectively connected to the partition plate 507 and the spring end plate 509. A spring 511 that is not sleeved on the guide column 504 is also connected between the support seat 505 and the partition plate 507 and between the partition plate 507 and the spring end plate 509 to increase the restoring force.The partition plate 507 and the spring end plate 509 can slide on the guide column 504. One end of the steel wire rope group 501 is fixedly connected to the housing of the corresponding wind wheel locking pin assembly 2, and the other end of the steel wire rope group 501 is connected to the front flange 3 of the gear box upward after winding around the fixed pulley 502 and the movable pulley 503 in sequence downward, and is close to the fixed pulley 502. The steel wire rope group 501 is tightened by the gravity of the guide column 504 and the guide column end plate 510, and the space distance between the support seat 507 and the movable pulley 503 is greater than the total stroke of the first spring 506 and the second spring 508, so that when the movable pulley 503 moves downward, the steel wire rope group 501 is always tightened. ;

[0029] Since all components of the flexible wind wheel locking device are supported on the front flange 3 of the gear box, the structure and size of the flange need to be designed according to the installation and load requirements. In addition, the angle range of the arc guide slot 4 is determined according to the design requirements, generally to meet the swing travel requirement of ±30° for wind wheel locking, and the surface of the arc guide needs to be hardened.

[0030] The two wind wheel locking pin assemblies 2 need to be spaced 60° apart to meet the requirements of different locking states of a blade, either horizontally or vertically. In addition, the size of the wind wheel locking pin is designed according to the ultimate locking torque, and the driving device of the wind wheel locking pin can be manual or electric. Since the wind wheel locking pin assembly 2 needs to swing with the swing trolley 1, the electric device needs to add a rotating cable retraction or swinging retraction device. A limit device can be added to the wind wheel locking pin assembly 2. Under maintenance conditions, the limit device is used to lock the wind wheel so that the wind wheel is completely locked. The limit device of the wind wheel locking assembly 2 can be a latch type or a locking hole can be opened at the tail of the assembly, and then a locking pin device fixed to the front end flange 3 of the gear box is connected in series for locking.

[0031] See also Figure 4 As shown, the support shaft 101 and bracket 102 of the swing trolley 1 are designed based on strength. The bracket 102 can adopt a frame-type split structure, and the two split parts are connected and pre-tightened by bolt connection. The conical rolling wheel 103 is supported by a ball bearing or a roller bearing, that is, a double-layer double-row conical rolling wheel is adopted. The swing trolley 1 can also increase the radial rolling wheel to bear the radial force. The conical rolling wheel 103 can also be designed as a cylindrical or spherical roller to withstand the bending moment and radial and axial forces in accordance with the shape of the guide rail. In addition, the swing trolley 1 needs to withstand the additional bending moment generated by the wind wheel locking pin assembly 2, so the preferred solution is to use a double-layer double-row conical rolling wheel to withstand the additional bending moment and radial and axial forces.

[0032] The number of wire ropes in the wire rope group is determined according to the design requirements: the wire rope design should take a safety factor of more than 5 times. It can be determined in combination with the installation space requirements. The wire rope needs to consider the corrosion protection requirements of the offshore environment, and stainless steel wire ropes are preferred. The pulley design meets the requirements of wire rope support and load transmission, and the pulley diameter meets the design specifications of the lifting industry. In principle, any spring type that meets the bearing capacity and stroke requirements can be used to form the spring. Due to the limited bearing capacity of the tension spring and the low connection reliability, compression springs are required to form the spring. Circular cross-section cylindrical helical compression springs are preferred, and the number of springs is determined according to the bearing capacity requirements. Rectangular and other non-circular cross-section cylindrical helical springs can also be used, and combined springs can also be used to increase the bearing capacity. Special-shaped springs or combination springs of different specifications and types can be selected according to the stiffness curve requirements.

[0033] Since the swing arc length of the wind wheel locking pin assembly 2 is very large, the compression spring that meets such a large stroke requirement is very long, the installation space is very large and there is a problem of compression stability. Therefore, it is necessary to use a movable pulley 503 in the flexible wind wheel locking unit 5 to reduce the stroke by half, and use two compression springs in series to meet the stroke requirement.

[0034] When the wind wheel drives the swinging trolley 1 to swing to the left, in the flexible wind wheel locking unit 5 on the left, the steel wire rope group 501 is tightened by the gravity of the guide column 504 and the guide column end plate 510, and a space distance greater than the stroke of the first spring 506 and the second spring 508 is left between the support seat 505 and the movable pulley 503, so that when the movable pulley 503 moves downward, the steel wire rope group 501 is always tightened, and the guide column 504 drives the guide column end plate 510 to disengage from the spring end plate 509, and no force is generated. At the same time, the steel wire rope group 501 of the flexible wind wheel locking unit 5 on the right is tightened upward, and the guide column 504 on the right is pulled out, so that the first spring 506, the second spring 508 and the spring 511 of the flexible wind wheel locking unit 5 on the right are compressed to generate a restoring force.

[0035] In summary, the principle of the flexible wind wheel locking device is: after the wind wheel locking pin 201 extends out to lock the wind wheel, since the outer shell of the wind wheel locking pin assembly 2 is fixedly connected to the swing trolley 1, the rotation of the wind wheel drives the wind wheel locking pin assembly 2 and the swing trolley 1 to rotate together. The swing trolley 1 can only move in the arc-shaped guide rail slot 4 on the front flange 3 of the gear box, thereby limiting the wind wheel to swing only within the angle range limited by the arc-shaped guide rail slot 4.

[0036] When the wind wheel drives the swinging trolley 1 to swing to the left, the steel wire rope group 501 of the flexible wind wheel locking unit 5 on the left side is prevented from loosening. Under the deadweight of the guide column 504 on the left side, the steel wire rope group 501 is tightened, and the steel wire rope group 501 of the flexible wind wheel locking unit 5 on the right side is tightened, so that the guide column 504 on the right side is pulled out, so that the first spring 506, the second spring 508 and the spring 511 on the right side are compressed to generate a restoring force. The larger the swing angle, the greater the restoring force generated by the spring. When the wind speed becomes smaller, the rotation torque of the wind wheel becomes smaller, and the restoring force generated by the first spring 506, the second spring 508 and the spring 511 will pull the wind wheel back to the vertical position. When the wind wheel drives the swinging trolley 1 to swing to the right, the action process is opposite, and the restoring force generated by the first spring 506, the second spring 508 and the spring 511 will still return the wind wheel to the vertical position.

[0037] Example 2

[0038] See also Figure 5 As shown, the difference from Example 1 is that this embodiment only uses one wind wheel locking pin assembly 2, the shell of the wind wheel locking pin assembly 2 is connected to one end of the swing trolley 1, and is fixed as a whole. Similarly, two flexible wind wheel locking units 5 are symmetrically distributed on the left and right sides of the front end flange 3 of the gear box, and the wire rope group 501 of one flexible wind wheel locking unit 5 is connected to the shell of the wind wheel locking pin assembly 2, while the wire rope group 501 of the other flexible wind wheel locking unit 5 is connected to the other end of the swing trolley 1.

[0039] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, all changes made according to the shape and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A flexible wind rotor locking device for a typhoon-resistant wind turbine generator set braking system, the braking system of the wind turbine generator set comprising a wind rotor locking disk (6), a gear box front end flange (3), and a wind rotor locking pin assembly (2), the wind rotor locking disk (6) being fixed to a hub (8) of a wind rotor by bolt connection, the gear box front end flange (3) being a part of a gear box of the wind turbine generator set, and being respectively fixed to a generator and a nacelle casing (7) of the wind turbine generator set by bolt connection, the wind rotor locking pin assembly (2) comprising a wind rotor locking pin (201) and a driving device for driving the wind rotor locking pin (201) to extend or retract, under the action of the driving device, the wind rotor locking pin (201) can extend into a locking hole on the wind rotor locking disk (6), thereby locking the wind rotor by locking the wind rotor locking disk (6); characterized in that: The flexible wind wheel locking device comprises a swing trolley (1) and two flexible wind wheel locking units (5); wherein, an arc-shaped guide rail slot hole (4) extending along its circumference is formed on the upper half of the front end flange (3) of the gear box, and the left and right parts of the arc-shaped guide rail slot hole (4) are mirror-symmetrical about the vertical center line of the front end flange (3) of the gear box; the swing trolley (1) is installed in the arc-shaped guide rail slot hole (4) and can only move in the arc-shaped guide rail slot hole (4); the wind wheel locking pin assembly (2) has two pins placed in the arc-shaped guide rail slot hole (4) and located on the swing trolley (1). The two wind wheel locking pin assemblies (2) are respectively connected to the left and right ends of the swing trolley (1) to form a whole, so that after the wind wheel locking pin (201) extends out to lock the wind wheel, the rotation of the wind wheel can drive the two wind wheel locking pin assemblies (2) to move with the swing trolley (1) within the angle range defined by the arc guide slot (4); the two flexible wind wheel locking units (5) are symmetrically distributed on the left and right sides of the front flange of the gear box and correspond to the two wind wheel locking pin assemblies (2), that is, one wind wheel locking pin assembly (2) is equipped with one flexible wind wheel locking unit (5);The flexible wind wheel locking unit (5) comprises a wire rope group (501), a fixed pulley (502), a movable pulley (503), a guide column (504), a support seat (505), a first spring (506), a partition plate (507), a second spring (508), a spring end plate (509) and a guide column end plate (510), wherein the support seat (505) is fixed to the lower half of the front end flange (3) of the gear box, and the fixed pulley (502) is fixed to the front end flange (510) of the gear box. 3), and is located between the arc-shaped guide rail slot hole (4) and the support seat (505), the movable pulley (503) is placed between the fixed pulley (502) and the support seat (505), and is installed on the top of the guide column (504), and the bottom of the guide column (504) vertically downward passes through the support seat (505), the partition (507), and the spring end plate (509) in sequence, and is fixedly connected to the guide column end plate (510), and the guide column end plate (510) prevents the guide column (504) from being moved. 4) detached from the spring end plate (509), the first spring (506) is placed between the support seat (505) and the partition plate (507), and is sleeved on the guide column (504), and its two ends are respectively connected to the support seat (505) and the partition plate (507), the second spring (508) is placed between the partition plate (507) and the spring end plate (509), and is sleeved on the guide column (504), and its two ends are respectively connected to the partition plate (507) and the spring end plate (509), the The partition plate (507) and the spring end plate (509) can slide on the guide column (504), one end of the steel wire rope group (501) is fixedly connected to the housing of the corresponding wind wheel locking pin assembly (2), and the other end of the steel wire rope group (501) is downwardly wound around the fixed pulley (502) and the movable pulley (503) in sequence, and then upwardly connected to the front flange (3) of the gear box and close to the fixed pulley (502), and the steel wire rope group (501) is tightened by the gravity of the guide column (504) and the guide column end plate (510). ; 2. The flexible wind wheel locking device for the typhoon-resistant wind turbine generator braking system according to claim 1 is characterized in that: The spatial distance between the support seat (507) and the movable pulley (503) is greater than the total stroke of the first spring (506) and the second spring (508), so that when the movable pulley (503) moves downward, the wire rope group (501) is always tightened.

3. The flexible wind wheel locking device for the typhoon-resistant wind turbine generator braking system according to claim 1 is characterized in that: A spring (511) not mounted on the guide column (504) is connected between the support seat (505) and the partition plate (507) and between the partition plate (507) and the spring end plate (509) to increase the restoring force.

4. The flexible wind wheel locking device for the typhoon-resistant wind turbine generator braking system according to claim 1 is characterized in that: The swing trolley (1) adopts double-layer double-row conical rolling wheels and can withstand the additional bending moment generated on the wind wheel locking pin assembly.

5. The flexible wind wheel locking device for the typhoon-resistant wind turbine generator braking system according to claim 1 is characterized in that: Buffers are installed at the extreme positions of both ends of the arc-shaped guide rail slot (4) to reduce the impact force generated when the wind wheel locking assembly (2) swings to the extreme position; and the two wind wheel locking pin assemblies (2) are spaced 60 degrees apart.

6. A flexible wind rotor locking device for a typhoon-resistant wind turbine generator set braking system, the braking system of the wind turbine generator set comprising a wind rotor locking disk (6), a gear box front end flange (3), and a wind rotor locking pin assembly (2), the wind rotor locking disk (6) being fixed to a hub (8) of a wind rotor by bolt connection, the gear box front end flange (3) being a part of a gear box of the wind turbine generator set, and being fixed to a generator and a nacelle casing (7) of the wind turbine generator set by bolt connection, respectively, the wind rotor locking pin assembly (2) comprising a wind rotor locking pin (201) and a driving device for driving the wind rotor locking pin (201) to extend or retract, under the action of the driving device, the wind rotor locking pin (201) can extend into a locking hole on the wind rotor locking disk (6), thereby locking the wind rotor by locking the wind rotor locking disk (6); characterized in that: The flexible wind wheel locking device comprises a swing trolley (1) and two flexible wind wheel locking units (5); wherein, an arc-shaped guide rail slot (4) extending along its circumference is formed on the upper half of the front end flange (3) of the gear box, and the left and right parts of the arc-shaped guide rail slot (4) are mirror-symmetrical about the vertical center line of the front end flange (3) of the gear box; the swing trolley (1) is installed in the arc-shaped guide rail slot (4) and can only move in the arc-shaped guide rail slot (4); the wind wheel locking pin assembly (2) has a portion placed in the arc-shaped guide rail slot (4) and located on one side of the swing trolley (1); and the outer shell of the wind wheel locking pin assembly (2) is connected to one end of the swing trolley (1) and is fixed as a whole, so that when the wind wheel locking pin (20 1) After the wind wheel is extended and locked, the rotation of the wind wheel can drive the wind wheel locking pin assembly (2) to move with the swinging trolley (1) within the angle range defined by the arc-shaped guide rail slot (4); two flexible wind wheel locking units (5) are symmetrically distributed on the left and right sides of the front flange of the gear box; the flexible wind wheel locking unit (5) comprises a wire rope group (501), a fixed pulley (502), a movable pulley (503), a guide column (504), a support seat (505), a first spring (506), a partition (507), a second spring (508), a spring end plate (509) and a guide column end plate (510); the support seat (505) is fixed to the lower half of the front flange (3) of the gear box, and the fixed pulley (502) is fixed to the front end of the gear box. The flange (3) is disposed between the arc guide rail slot (4) and the support seat (505). The movable pulley (503) is disposed between the fixed pulley (502) and the support seat (505) and is installed on the top of the guide column (504). The bottom of the guide column (504) vertically passes through the support seat (505), the partition plate (507) and the spring end plate (509) in sequence and is fixedly connected to the guide column end plate (510). The guide column end plate (510) prevents the guide column (504) from being separated from the spring end plate (509). The first spring (506) is disposed between the support seat (505) and the partition plate (507) and is sleeved on the guide column (504). The two ends of the first spring (506) are respectively connected to the support seat (505) and the partition plate (507). , the second spring (508) is placed between the partition (507) and the spring end plate (509), and is sleeved on the guide column (504), and its two ends are respectively connected to the partition (507) and the spring end plate (509), and the partition (507) and the spring end plate (509) can slide on the guide column (504); one end of the steel wire rope group (501) of one of the flexible wind wheel locking units (5) is fixedly connected to the housing of the wind wheel locking pin assembly (2), and the other end of the steel wire rope group (501) is downwardly wound around the fixed pulley (502) and the movable pulley (503) in sequence, and then upwardly connected to the front end flange (3) of the gear box, and is close to the fixed pulley (502), and the steel wire rope group (501) is tightened by using the gravity of the guide column (504) and the guide column end plate (510);One end of a steel wire rope group (501) of another flexible wind wheel locking unit (5) is connected to the other end of the swing trolley (1), and the other end of the steel wire rope group (501) is wound around the fixed pulley (502) and the movable pulley (503) downwards in sequence, and then connected to the front flange (3) of the gear box upwards, and close to the fixed pulley (502).

7. The flexible wind wheel locking device for the typhoon-resistant wind turbine generator braking system according to claim 6 is characterized in that: The spatial distance between the support seat (507) and the movable pulley (503) is greater than the total stroke of the first spring (506) and the second spring (508), so that when the movable pulley (503) moves downward, the wire rope group (501) is always tightened.

8. The flexible wind wheel locking device for the typhoon-resistant wind turbine generator braking system according to claim 6 is characterized in that: A spring (511) not mounted on the guide column (504) is connected between the support seat (505) and the partition plate (507) and between the partition plate (507) and the spring end plate (509) to increase the restoring force.

9. The flexible wind wheel locking device for the typhoon-resistant wind turbine generator braking system according to claim 6 is characterized in that: The swing trolley (1) adopts double-layer double-row conical rolling wheels and can withstand the additional bending moment generated on the wind wheel locking pin assembly.

10. The flexible wind wheel locking device for the typhoon-resistant wind turbine generator braking system according to claim 6 is characterized in that: Buffers are installed at the extreme positions of both ends of the arc-shaped guide rail slot (4) to reduce the impact force generated when the wind wheel locking assembly (2) swings to the extreme position.

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