Device and method for replacing blades of wind driven generator

Abstract

The invention relates to a wind driven generator blade replacing device and method, the blade replacing device comprises a blade root hoop (1) and a hub lifting point assembly (2), the blade root hoop (1) surrounds the blade root of a blade (3), the hub lifting point assembly (2) is arranged on the outer side of a hub (4), and the blade root hoop (1) is connected with the hub lifting point assembly (2) and a lifting assembly (6) on the ground through a lifting rope (5). Compared with the prior art, the requirement for a crane can be lowered, and the replacement cost of the blades is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine generators, and in particular to a device and method for replacing blades of a wind turbine generator. Background Art

[0002] With the increasing installed capacity of wind turbines and the increasing service life of wind turbines, more and more units need to replace blades. Conventional methods of replacing blades mainly use large cranes, mainly double crane replacement and horizontal single blade hoist replacement. Both replacement methods require the blades to be replaced to be kept horizontal, and the height of the crane needs to reach the normal hoisting height of the wind turbine. The lifting height and tonnage requirements of the crane are very high. For blade replacement of towers with a height of 140 meters or even more than 160 meters, the replacement cost is high.

[0003] At present, some enterprises have developed a vertical blade replacement solution. A clamp device is set at the root of the blade, and two sets of pulleys are set on the clamp. The fixed pulley set preset on the hub and the ground winch form a blade root lifting system, and the tail part adopts a crane tail. The clamp segments are connected by flanges and bolted. Manual installation is adopted, and the deadweight requirements of the clamp are high. As the deadweight and size of the blades increase, and the tower height increases, the size and deadweight of the clamp will increase, and it cannot be installed manually. The overall principle of another vertical blade replacement solution is similar to the above, except that the lowering of the root end of the blade is directly achieved by an electric hoist set in the hub. As the size and weight of the blades increase, the lifting capacity and size of the electric hoist will increase. This solution has great limitations and is no longer suitable for large models. There is also a method of vertical blade replacement developed by one company, which has many actual replacement cases. The blades are tied with slings, and fixed pulleys are set on the other two blades. The blades are lowered by winding the rope of the ground winch. The tail is lifted by a car, but the load limitation is obvious, not exceeding 12 tons, which is not suitable for the current era of large wind turbines. Summary of the invention

[0004] The purpose of the present invention is to provide a wind turbine blade replacement device and replacement method to reduce the blade replacement cost.

[0005] The objective of the present invention can be achieved through the following technical scheme: a wind turbine blade replacement device, comprising a blade root hoop and a hub hanging point assembly, wherein the blade root hoop is encircled on the blade root of the blade, the hub hanging point assembly is arranged on the outside of the hub, and the blade root hoop is connected to the hub hanging point assembly and the lifting assembly on the ground through a lifting rope.

[0006] Preferably, the blade root clamp is connected to the blade root end pulley, the hub hanging point assembly is connected to the hub end pulley, one end of the lifting rope is fixed to the hub hanging point assembly, and the other end passes through the blade root end pulley and the hub end pulley in sequence to connect to the lifting assembly on the ground.

[0007] Further preferably, the blade root clamp is connected to the blade root end pulley through a fixed bracket, the hub hanging point assembly is connected to the hub end pulley through a swing bracket, the swing bracket is rotatably connected to the hub hanging point assembly body and is connected to a telescopic rod, one end of the lifting rope is fixed to the swing bracket, and the other end passes through the blade root end pulley and the hub end pulley in turn to connect to the lifting assembly on the ground.

[0008] Further preferably, one end of the swing bracket is rotatably connected to the main body of the hub hanging point assembly, and the other end is rotatably provided with a hub end pulley. The middle part is connected with a hydraulic telescopic rod and can swing under the drive of the hydraulic telescopic rod. One end of the lifting rope is fixed to one end of the swing bracket provided with the hub end pulley, and the other end passes through the blade root end pulley and the hub end pulley in turn to connect to the lifting assembly on the ground.

[0009] Preferably, the hub suspension point assembly body includes a base, a slewing bearing and a slewing frame, the base is installed on the outside of the hub through anchor bolts, the slewing frame is rotatably set on the base through the slewing bearing, and the hydraulic telescopic rod and the swing bracket are both connected to the slewing frame.

[0010] Further preferably, the wheel hub is provided with a plurality of reserved interfaces corresponding to the anchor bolts.

[0011] Preferably, the blade root clamp comprises a clamp sheet, a hydraulic telescopic member, a latch and a clamp tightening member;

[0012] The hoop plates are divided into two groups. In each group of hoop plates, two adjacent hoop plates are hinged, and a hydraulic telescopic member is provided between the two adjacent hoop plates. One end of the two groups of hoop plates are connected by a latch, and the other end is connected by a hoop tightening member.

[0013] Preferably, the hoop piece is an arc-shaped plate structure, which can be enclosed to form a circular structure matching the blade root.

[0014] Preferably, in each group of clamping hoop plates, hydraulic telescopic parts are provided on the outer sides of two adjacent clamping hoop plates.

[0015] Preferably, the clamp tightening member comprises a hydraulic wrench, a screw and a nut, and the hydraulic wrench drives the screw to rotate, thereby shrinking the gap between the two groups of clamp plates, and finally tightening the clamp.

[0016] Preferably, the blade root clamp is connected with a pin shaft and a clamp reaction arm structure, and a pin shaft hole is provided on the hub suspension point assembly;

[0017] The hoop reaction arm structure is detachably connected to the wheel hub suspension point assembly via a pin shaft and a pin shaft hole.

[0018] Further preferably, the clamp reaction arm structure is connected to the fixed bracket, and the pin shaft hole is arranged on the rotating frame.

[0019] Preferably, the lifting assembly comprises a ground winch, and the lifting rope comprises a ground winch rope.

[0020] Preferably, the wind turbine blade replacement device also includes a tail crane assembly.

[0021] Further preferably, the tail lifting assembly includes a tail lifting point arranged at the tail of the blade and a tail lifting truck crane connected to the tail lifting point.

[0022] Further preferably, the tail suspension point includes a crane suspension point, an upper clamp, a lower clamp, a suspension point hinge, a retaining frame and upper and lower tightening parts. The shapes of the upper clamp and the lower clamp are conformal structures designed according to the surface shape of the blade, and the interior is filled with foam rubber material to prevent damage to the blade.

[0023] A method for replacing blades of a wind turbine generator, using the above device, comprises the following steps:

[0024] Adjust the blade to be removed to point to the ground, then install the hub lifting point assembly and lifting rope, lift the blade root clamp to the root of the blade through the lifting assembly, close and tighten the blade root clamp, establish a lifting point at the blade root, loosen the connection between the blade and the hub, control the operation of the lifting assembly, and realize the descent of the blade.

[0025] Preferably, the wind turbine blade replacement method comprises the following steps:

[0026] S1: Adjust the blade to be removed to point to the ground;

[0027] S2: Install the hub suspension point assembly on the outside of the hub through anchor bolts, and fix the suspension rope to the fixed end of the suspension rope through the pulley at the hub end and the pulley at the blade root end in sequence;

[0028] S3: driving the blade root clamp in the unfolded posture to the predetermined position of the blade root through the lifting assembly;

[0029] S4: The clamp reaction arm structure is installed by inserting the pin shaft. The change in the center of gravity of the blade root clamp closing generates a flipping moment which is offset by the pin shaft.

[0030] S5: The clamp is closed by hydraulic expansion joints;

[0031] S6: The blade root is embraced by the blade root hoop through the pin;

[0032] S7: Pull out the pin;

[0033] S8: The blade root clamp is tightened with the blade root by means of the clamp tightening member, thereby generating sufficient static friction to resist the deadweight of the blade and establishing a stable and reliable hanging point at the blade root;

[0034] S9: Loosen the connection between the blade and the hub, and lower the blade (i.e., disassemble the blade) through the lifting assembly.

[0035] Preferably, after establishing a stable and reliable lifting point at the blade root in step S8, a reliable tail lifting point is established on the blade through the tail lifting assembly, and after loosening the connection between the blade and the hub in step S9, the vertical lowering of the blade is achieved through the joint action of the lifting assembly and the tail lifting assembly.

[0036] Further preferably, the tail lifting point is lifted by a tail crane truck, inserted into the blade tip, and after being inserted into the specified position, tightened by upper and lower tightening parts, thereby achieving a tight hold between the tail clamp and the blade and establishing a reliable tail lifting point.

[0037] Further preferably, the wind turbine blade replacement method further comprises the following steps:

[0038] S10: establishing a blade root hanging point and a tail hanging point on the blade to be installed respectively through a blade root hoop and a tail hanging point;

[0039] S11: lift the blade to be installed to the hub by using the lifting assembly and the tail crane;

[0040] S12: Connecting the blade to be installed with the hub to install the blade;

[0041] S13: Remove the hub suspension point assembly from the outside of the hub, and remove the blade root clamp and tail suspension point from the blade.

[0042] Preferably, step S1 of adjusting the blades to be removed to an angle pointing to the ground means adjusting the wind wheel to a positive Y posture, with the blades to be removed being located directly below the wind wheel.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] 1. The traditional blade removal process requires the use of a large crane for replacement. With the height of the wind turbine and the weight of the blades, the price of the related crane is high. The solution of the present invention can greatly reduce the lifting capacity of the crane and the height requirement of the crane, thereby reducing the cost of the crane and the replacement cost of the blades.

[0045] 2. The blade root hoop of the present invention is connected to the blade root in an embracing manner, which is only related to the blade root diameter, has high versatility, and can be directly lifted and installed by a winch, avoiding the process of operating in the wheel hub or the nacelle in the previous solution, and can greatly improve the replacement efficiency;

[0046] 3. When a wind turbine needs to replace 2 or 3 blades at the same time, the solution of the present invention can greatly reduce the tooling installation time due to the rotatable function of the hub suspension point assembly;

[0047] 4. The hub suspension point assembly of the present invention is connected through a reserved interface on the hub head, which is independent of the internal structure size of the hub, thus greatly improving the versatility of the tooling;

[0048] 5. The present invention turns the target blade to be replaced toward the ground, sets a set of lifting points on the blade root, connects with the lifting points preset on the hub through a winch rope, and sets a tail crane at the blade tip, which can reduce the lifting height requirement of the crane by 40 to 50 meters, greatly reducing the requirements for the crane and the replacement cost of the blade;

[0049] 6. The present invention has low requirements on the deadweight of the clamp, and can be applied to the replacement of large-sized blades. It can bear a load of xx tons and is suitable for the era of large wind turbines. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a schematic diagram of the working principle of the device of the present invention;

[0051] Figure 2 It is a schematic diagram of the local structure of the device of the present invention;

[0052] Figure 3 It is a schematic diagram of the telescopic rod of the hub suspension point assembly of the present invention when it is extended to the limit;

[0053] Figure 4 It is a schematic diagram of the telescopic rod of the hub suspension point assembly of the present invention when it is retracted to the limit;

[0054] Figure 5 It is a front view of the blade root clamp of the present invention;

[0055] Figure 6 A top view of the blade root clamp of the present invention;

[0056] Figure 7 It is a side view of the blade root clamp of the present invention;

[0057] Figure 8 It is a structural schematic diagram of the clamp tightening member of the present invention;

[0058] Fig. 9 The diagram is a schematic diagram of the unfolding posture of the blade root clamp of the present invention. Figure 1 ;

[0059] Fig.10 The diagram is a schematic diagram of the unfolding posture of the blade root clamp of the present invention. Figure 2 ;

[0060] Fig.11 It is a schematic diagram of the blade root hoop lifting of the present invention;

[0061] Fig.12 It is a schematic diagram of the blade root clamp of the present invention being closed and tightened;

[0062] Fig.13 It is a schematic diagram of the blade descent of the present invention;

[0063] Fig.14 This is a schematic diagram of the open state of the tail lifting point of the present invention;

[0064] Fig.15 This is a schematic diagram of the tightened state of the tail suspension point of the present invention;

[0065] Fig.16 A schematic structural diagram of the tail lifting point of the present invention;

[0066] In the figure: 1-blade root clamp, 11-blade root end pulley, 12-fixed bracket, 13-clamp plate, 14-hydraulic telescopic part, 15-latch, 16-clamp tightening part, 161-hydraulic wrench, 162-screw, 163-nut, 17-pin shaft, 18-clamp reaction arm structure, 2-wheel hub hanging point assembly, 21-wheel hub end pulley, 22-swing bracket, 221-sling fixed end, 23-hydraulic Telescopic rod, 24-base, 25-slewing bearing, 26-slewing frame, 27-anchor bolt, 28-pin shaft hole, 3-blade, 4-hub, 5-lifting rope, 6-lifting assembly, 7-tail lifting assembly, 71-tail lifting point, 711-crane lifting point, 712-upper clamp, 713-lower clamp, 714-lifting point hinge, 715-retaining frame, 716-upper and lower tightening parts, 72-tail crane. DETAILED DESCRIPTION

[0067] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0068] Example 1

[0069] A wind turbine blade replacement device comprises a blade root clamp 1, a hub suspension point assembly 2, a suspension rope 5 and a lifting assembly 6.

[0070] The blade root hoop 1 is wrapped around the blade root of the blade 3, the hub suspension point assembly 2 is arranged outside the hub 4, and the suspension rope 5 is connected with the blade root hoop 1, the hub suspension point assembly 2 and the lifting assembly 6.

[0071] When using the device of this embodiment to replace blades, the target blade 3 to be replaced is adjusted to face the ground, and a set of lifting points is set on the root of the blade 3 through the blade root clamp 1, which is connected to the lifting point (hub lifting point assembly 2) preset on the hub 4 through a winch rope system (lifting rope 5). A tail crane is set at the tip of the blade, which can reduce the lifting height requirement of the crane by 40 to 50 meters, greatly reducing the requirements for the crane and reducing the cost of replacing the blades.

[0072] Example 2

[0073] A blade replacement device for a wind turbine generator, a blade root clamp 1 comprises a blade root end pulley 11, a fixed bracket 12, a clamp piece 13, a hydraulic telescopic component 14, a latch 15 and a clamp tightening component 16. The blade root clamp 1 comprises two groups of clamp pieces 13, in each group of clamp pieces 13, two adjacent clamp pieces 13 are hinged and a hydraulic telescopic component 14 is provided between the two to adjust the hinge angle of the two, one end of the two groups of clamp pieces 13 is connected by a latch 15, and the other end is connected by a clamp tightening component 16. The two groups of clamp pieces 13 are respectively connected to the blade root end pulley 11 through the fixed bracket 12.

[0074] The hub suspension point assembly 2 includes a hub end pulley 21, a swing bracket 22, a hydraulic telescopic rod 23, a base 24, a slewing bearing 25, a slewing frame 26 and an anchor bolt 27. The base 24 is mounted on the outside of the hub 4 through the anchor bolt 27, and the slewing frame 26 is rotatably mounted on the base 24 through the slewing bearing 25. One end of the swing bracket 22 is rotatably mounted on the slewing frame 26, and the other end is provided with a hub end pulley 21, and a suspension rope fixed end 221 is provided at the end. One end of the hydraulic telescopic rod 23 is mounted on the slewing frame 26, and the other end is connected to the middle part of the swing bracket 22, and the swing bracket 22 can be driven to swing by telescoping, thereby driving the hub end pulley 21 to swing.

[0075] In this embodiment, one end of the lifting rope 5 is fixed to the lifting rope fixing end 221, and the other end passes through the blade root end pulley 11 and the hub end pulley 21 in sequence to connect to the lifting assembly 6 on the ground.

[0076] Furthermore, in this embodiment, the blade replacement device further comprises a tail suspension assembly 7, which comprises a tail suspension point 71 provided at the tip of the blade 3 and a tail suspension vehicle suspension 72 connected to the tail suspension point 71. The rest is the same as in the first embodiment.

[0077] Example 3

[0078] A wind turbine blade replacement device, the clamp tightening member 16 includes a hydraulic wrench 161, a screw 162 and a nut 163, and the hydraulic wrench 161 drives the screw 162 to rotate, thereby shrinking the gap between the two groups of clamp plates 13, and finally tightening the clamp.

[0079] The blade root clamp 1 also includes a pin 17 and a clamp reaction arm structure 18. A pin hole 28 matching the pin 17 is provided on the rotating frame 26. The clamp reaction arm structure 18 is connected to the fixed bracket 12 and is detachably connected to the hub suspension point assembly 2 through the pin 17 and the pin hole 28.

[0080] The tail lifting point 71 includes a crane lifting point 711, an upper clamp 712, a lower clamp 713, a lifting point hinge 714, a retainer 715, and upper and lower tightening members 716. The upper clamp 712 and the lower clamp 713 are designed as conformal structures according to the surface shape of the blade, and are filled with foam rubber material to prevent damage to the blade. The crane lifting point 711 is connected to the tail lifting vehicle crane 72, and the upper clamp 712 and the lower clamp 713 are arranged on the retainer 715, and can move closer to or away from each other under the drive of the upper and lower tightening members 716. The retainer 715 is connected to the crane lifting point 711 through the lifting point hinge 714.

[0081] The tail lifting point 71 is lifted by the tail crane (tail crane 72), and after adjusting the angle, it is inserted from the blade tip, and after being inserted to the specified position, it is tightened by the upper and lower tightening members 716, so that the tail clamp and the blade are tightly held, and a reliable tail lifting point is established. The rest is the same as in Example 2.

[0082] Example 4

[0083] A wind turbine blade vertical replacement device and vertical replacement method, such as Figure 1 As shown, it mainly consists of the following parts, namely, the ground winch assembly (hoisting assembly 6), the tail crane assembly 7 (including the tail crane 72 and the tail crane point 71), the blade root clamp 1, and the hub crane point assembly 2; the ground winch assembly is placed on the ground, the hub crane point assembly 2 is arranged on the outside of the hub 4, connected through the preset interface of the hub mouth, and the blade root clamp 1 is encircled on the blade root of the blade 3. Figure 2 As shown, the winch rope (hanging rope 5) of the ground winch group is finally connected to the blade root clamp 1 through the hub end pulley 21 of the hub hanging point assembly 2, thereby pulling the blade root, and finally the vertical lowering function of the blade 3 is realized through the combined action of the tail truck crane 72, the tail hanging point 71 and the ground winch group.

[0084] Specifically:

[0085] Hub suspension point assembly 2, such as Figures 3-4As shown, it is composed of the following parts, namely: a slewing frame 26, a slewing bearing 25, a base 24, an anchor bolt 27, an oil cylinder (hydraulic telescopic rod 23), and a hub end pulley 21; the hub end pulley 21 can be driven by the hydraulic telescopic rod 23 to swing, thereby driving the horizontal movement of the blade root. The slewing frame 26 is connected to the base 24 through the slewing bearing 25, and the slewing frame 26 can rotate around the base 24. When a single wind turbine replaces two or three blades, this rotation function can eliminate the repetitive installation work of the hub hanging point. The slewing frame 26 is provided with a pin shaft hole 28, corresponding to the pin shaft 17 connected to the blade root clamp 1.

[0086] Blade root clamp 1, such as Figures 5 to 7 As shown, it is composed of the following parts, namely: a clamping plate 13, a hinge cylinder (hydraulic telescopic part 14), a latch 15, a clamping tightening part 16, a pin 17, and a clamping reaction arm structure 18; the two groups of clamping plates 13 are connected by the clamping tightening part 16, and there is a natural gap between the two.

[0087] like Figure 8 As shown, the clamp tightening member 16 is composed of 4 groups of screw tightening mechanisms, each group is composed of a hydraulic wrench 161, a screw 162 and a nut 163. The hydraulic wrench 161 drives the screw 162 to rotate, thereby shrinking the gap and finally tightening the clamp.

[0088] The blade root hoop 1 has two postures, namely, the encircling posture and the unfolding posture (such as Figures 9-10 ), the switching between the embracing posture and the unfolding posture is achieved by the telescopic control of the hydraulic telescopic part 14. When the pin 15 is inserted, the clamp is switched to the embracing posture. At this time, the clamp tightening part 16 is controlled to narrow the gap, thereby achieving the clamping of the clamp and the blade root, thereby achieving the purpose of establishing a hanging point at the blade root.

[0089] like Figures 11 to 13 As shown:

[0090] When the blades need to be replaced, the blades to be replaced need to be turned to an angle pointing to the ground. In this embodiment, the blades to be removed from the wind turbine are located directly below the wind wheel at an angle of 75 degrees to the ground.

[0091] Next, it is necessary to install the wheel hub suspension point assembly 2, which is connected to the wheel hub 4 through the anchor bolt 27. The ground winch rope (suspension rope 5) passes through the wheel hub end pulley 21 and the blade root end pulley 11 in turn, and is finally fixed on the suspension rope fixed end 221 of the swing bracket 22; the blade root end pulley 11 is connected to the blade root clamp 1 to complete the winding of the rope system.

[0092] Next, the blade root clamp 1 (in an unfolded position) is lifted to a predetermined position of the blade root by the action of the ground winch (hoisting assembly 6).

[0093] Next, the pin shaft 17 is inserted and the clamp reaction arm structure 18 is installed. The change in the center of gravity when the clamp is closed generates a turning moment which is offset by the pin shaft 17.

[0094] Next, the action of the hydraulic expansion member 14 of the blade root clamp 1 is controlled to realize the closing action of the blade root clamp 1 .

[0095] Next, the latch 15 is controlled to move so that the blade root hoop 1 is encircled with the blade root.

[0096] Next, pull out the pin shaft 17.

[0097] Next, the clamp tightening member 16 is controlled so that the blade root clamp 1 is tightened with the blade root, thereby generating sufficient static friction to resist the deadweight of the blade 3 and establishing a stable and reliable hanging point at the blade root.

[0098] Next, the ground winch is controlled to lower the blade 3. Since the blades of large aircraft generally have a large forward inclination angle, the action of the hydraulic telescopic rod 23 needs to be controlled at the same time, so as to drive the blade root to move horizontally and prevent the blade root screw and the pitch bearing from getting stuck. This ultimately enables the blade to be lowered vertically.

[0099] like Figures 14 to 16 As shown, the tail suspension point 71 is composed of the following parts: a crane suspension point 711, an upper clamp 712, a lower clamp 713, a suspension point hinge 714, a retainer 715, and upper and lower tightening members 716. The shapes of the upper clamp and the lower clamp are conformal structures designed according to the surface shape of the blade, and the interior is filled with foam rubber material to prevent damage to the blade. The tail suspension point 71 is lifted by the tail crane (tail crane 72), adjusted to a 75-degree attitude angle, and inserted from the tip of the blade. After being inserted into the designated position, it is tightened by the upper and lower tightening members 716, thereby achieving a tight hold between the tail clamp and the blade, and establishing a reliable tail suspension point.

[0100] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A wind turbine blade replacement device, characterized in that: The invention comprises a blade root hoop (1) and a wheel hub suspension point assembly (2), wherein the blade root hoop (1) is encircled on the blade root of a blade (3), the wheel hub suspension point assembly (2) is arranged outside the wheel hub (4), and the blade root hoop (1) is connected to the wheel hub suspension point assembly (2) and a lifting assembly (6) on the ground via a lifting rope (5).

2. The wind turbine blade replacement device according to claim 1, characterized in that: The blade root hoop (1) is connected to a blade root end pulley (11), the wheel hub suspension point assembly (2) is connected to a wheel hub end pulley (21), one end of a suspension rope (5) is fixed to the wheel hub suspension point assembly (2), and the other end of the suspension rope (5) passes through the blade root end pulley (11) and the wheel hub end pulley (21) in sequence to connect to a lifting assembly (6) on the ground.

3. The wind turbine blade replacement device according to claim 2, characterized in that: The blade root hoop (1) is connected to the blade root end pulley (11) via a fixed bracket (12); the wheel hub suspension point assembly (2) is connected to the wheel hub end pulley (21) via a swing bracket (22); the swing bracket (22) is rotatably connected to the main body of the wheel hub suspension point assembly (2) and is connected to a telescopic rod (23); one end of a suspension rope (5) is fixed to the swing bracket (22), and the other end passes through the blade root end pulley (11) and the wheel hub end pulley (21) in sequence to connect to a lifting assembly (6) on the ground.

4. The wind turbine blade replacement device according to claim 3, characterized in that: One end of the swing bracket (22) is rotatably connected to the main body of the hub suspension point assembly (2), and the other end is rotatably provided with a hub end pulley (21). A hydraulic telescopic rod (23) is connected in the middle and can swing under the drive of the hydraulic telescopic rod (23). One end of the suspension rope (5) is fixed to one end of the swing bracket (22) provided with the hub end pulley (21), and the other end is passed through the blade root end pulley (11) and the hub end pulley (21) in sequence to connect to the lifting assembly (6) on the ground.

5. The wind turbine blade replacement device according to claim 4, characterized in that: The hub suspension point assembly (2) comprises a base (24), a slewing bearing (25) and a slewing frame (26); the base (24) is mounted on the outside of the hub (4) via an anchor bolt (27); the slewing frame (26) is rotatably arranged on the base (23) via the slewing bearing (25); and the hydraulic telescopic rod (23) and the swing bracket (22) are both connected to the slewing frame (26).

6. The wind turbine blade replacement device according to claim 1, characterized in that: The blade root clamp (1) comprises a clamp plate (13), a hydraulic telescopic part (14), a latch (15) and a clamp tightening part (16); The hoop pieces (13) are divided into two groups. In each group of hoop pieces (13), two adjacent hoop pieces (13) are hinged, and a hydraulic telescopic member (14) is provided between the two adjacent hoop pieces (13). One end of the two groups of hoop pieces (14) is connected by a latch (15), and the other end is connected by a hoop tightening member (16). The clamping plates (13) are in the form of an arc-shaped plate structure, and can be enclosed to form a circular structure matching the blade root. In each group of clamping plates (13), hydraulic telescopic parts (14) are provided on the outer sides of two adjacent clamping plates (13).

7. The wind turbine blade replacement device according to claim 1, characterized in that: The blade root hoop (1) is connected with a pin shaft (17) and a hoop reaction arm structure (18), and a pin shaft hole (28) is provided on the wheel hub suspension point assembly (2); The hoop reaction arm structure (18) is detachably connected to the wheel hub suspension point assembly (2) via a pin shaft (17) and a pin shaft hole (28).

8. The wind turbine blade replacement device according to claim 1, characterized in that: The lifting assembly (6) comprises a ground winch, and the lifting rope (5) comprises a ground winch rope.

9. The wind turbine blade replacement device according to claim 1, characterized in that: The wind turbine blade replacement device further comprises a tail suspension assembly (7), wherein the tail suspension assembly (7) comprises a tail suspension point (71) arranged at the tail of the blade (3) and a tail suspension vehicle suspension (72) connected to the tail suspension point (71).

10. A method for replacing blades of a wind turbine generator, characterized in that: The method is carried out using the device according to any one of claims 1 to 9, comprising the following steps: The blade (3) to be removed is adjusted to an angle pointing to the ground, and then the hub lifting point assembly (2) and the lifting rope (5) are installed. The blade root clamp (1) is lifted to the blade root of the blade (3) through the lifting assembly (6). The blade root clamp (1) is closed and tightened, and a lifting point is established at the blade root. The connection between the blade (3) and the hub (4) is loosened, and the operation of the lifting assembly (6) is controlled to realize the descent of the blade (3).

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