A lifting device for eccentric wind turbine pitch gearbox

Abstract

The present invention discloses a hoist for a variable pitch gearbox of an eccentric wind turbine, belonging to the field of wind turbine hoisting. A hoist for a variable pitch gearbox of an eccentric wind turbine comprises a hoisting beam with a hook at the lower end, and further comprises: two sets of symmetrically arranged support legs, both connected to the hoisting beam via an elastic lifting mechanism, vertical plates fixedly connected to both sides of the lower end of the hoisting beam, and arc-shaped support plates connected to both vertical plates via a telescopic mechanism; two sets of nozzles, respectively fixedly connected to the upper ends of the two arc-shaped support plates, and multiple air blowing nozzles fixedly mounted at the lower ends of the two nozzles toward the inner walls of the arc-shaped support plates; the present invention can prevent the variable pitch gearbox from shaking during hoisting, prevent the variable pitch gearbox from being bumped during hoisting, and thus make hoisting safer.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine hoisting, and in particular to a hoisting device for a variable pitch gearbox of an eccentric wind turbine. Background Art

[0002] Wind power generation converts the kinetic energy of wind into electrical energy. Wind energy is a clean, pollution-free, renewable energy source that has long been used, primarily through windmills for pumping water and grinding flour. However, interest has grown in harnessing the power of wind. The variable pitch gearbox, a key component in wind turbines, is heavy and cannot be lifted manually, requiring a hoist.

[0003] At present, when lifting the variable pitch gearbox, the hook on the lifting device is generally hung on the lifting ring of the variable pitch gearbox, and then the lifting device is lifted upward to complete the lifting of the variable pitch gearbox. Since the variable pitch gearbox is mainly fixed simply by the hook, the variable pitch gearbox is prone to shaking on the lifting device during the lifting process, and there is a risk of falling, and the lifting process is not safe enough. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem in the prior art that a lifting device for a variable pitch gearbox is prone to shaking during lifting, and to propose a lifting device for a variable pitch gearbox of an eccentrically-gravity wind turbine.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A sling for a variable pitch gearbox of an eccentric wind turbine comprises a sling beam with a hook provided at the lower end, and also comprises: two sets of symmetrically arranged supporting legs, both connected to the sling beam through an elastic lifting mechanism, wherein vertical plates are fixedly connected to both sides of the lower end of the sling beam, and both vertical plates are connected to an arc-shaped support plate through a telescopic mechanism; two sets of nozzles are respectively fixedly connected to the upper ends of the two arc-shaped support plates, wherein the lower ends of the two nozzles are fixedly mounted with a plurality of blowing nozzles facing the inner walls of the arc-shaped support plates.

[0007] In order to cushion the impact force when landing, preferably, the elastic lifting mechanism includes sliding holes arranged on both sides of the suspension beam, and sliding rods are slidably connected in the two sliding holes, wherein the two supporting feet are respectively fixedly connected to the lower ends of the two sliding rods, and the tops of the two sliding rods are fixedly connected to top plates, and the two top plates are elastically connected to the top of the suspension beam through buffer springs.

[0008] In order to prevent the pitch gearbox from shaking, the telescopic mechanism further includes an inclined rod slidably connected to the side wall of the vertical plate, and the side wall of the vertical plate is also rotatably connected to an internally threaded tube arranged parallel to the inclined rod, wherein the internal thread of the internally threaded tube is connected to a threaded rod, the arc-shaped support plate is fixedly connected to the inclined rod, and the lower end of the threaded rod is rotatably connected to the outer wall of the arc-shaped support plate, and the sliding rod is provided with a linkage mechanism for driving the internally threaded tube to rotate.

[0009] In order to automatically drive the internal threaded tube to rotate, the linkage mechanism further includes a transmission shaft rotatably connected to the side wall of the vertical plate, and a driven gear and a driving gear are fixedly installed at both ends of the transmission shaft, wherein a rack meshing with the driven gear is fixedly installed on the slide rod, and a driven gear meshing with the driving gear is fixedly installed on the outer wall of the internal threaded tube.

[0010] In order to automatically supply air to the nozzle, preferably, a telescopic airbag is fixedly installed between the top plate and the top of the suspension beam, and an intake pipe and an exhaust pipe are fixedly installed on the telescopic airbag, wherein a one-way valve is fixedly installed in the intake pipe and the exhaust pipe, and the exhaust pipe is fixedly connected and communicated with the nozzle through a connecting pipe.

[0011] In order to prevent dust from being sucked into the telescopic airbag, further, a groove is provided at the lower end of the suspension beam, the end of the suction pipe extends to the inner top of the groove, and a filter plate is detachably installed at the lower end of the groove.

[0012] In order to prevent the dust on the two arc-shaped support plates from contaminating each other, preferably, the lower ends of the two arc-shaped support plates are connected to a baffle through an elastic lifting mechanism, a gap is provided between the baffle and the lower end of the arc-shaped support plate, and a pulley is rotatably installed on the top of the baffle.

[0013] In order to make the baffle elastically press against the bottom of the pitch gearbox, the elastic lifting mechanism further includes support plates fixedly connected to both sides of the lower end of the arc-shaped support plate, and the baffle is longitudinally slidably connected to the two support plates, wherein the outer walls of the two baffles are fixedly connected to limit plates, and the limit plates and the support plates are elastically connected by a lifting spring.

[0014] In order to keep the dust blocked by the baffle away from the inner wall of the arc-shaped supporting plate, further, the lower ends of the two baffles are fixedly connected with an arc-shaped guide plate, and the bending direction of the arc-shaped guide plate is opposite to the bending direction of the arc-shaped supporting plate.

[0015] In order to prevent the arc-shaped supporting plates from scratching the pitch gearbox, preferably, inner walls of the two arc-shaped supporting plates are provided with rubber pads, and upper and lower ends of the rubber pads are provided with chamfers.

[0016] Compared with the prior art, the present invention provides a sling for an eccentric wind turbine pitch gearbox, which has the following beneficial effects:

[0017] 1. This hoist for the variable pitch gearbox of an eccentric wind turbine moves downward through the lifting beam. The supporting legs will first touch the ground and stretch the buffer springs. The buffer springs can cushion the impact of landing, thereby effectively protecting the variable pitch gearbox.

[0018] 2. This lifting device for the variable pitch gearbox of an eccentric wind turbine drives the driven gear to slide in the opposite direction on the rack through the upward sliding lifting beam, thereby driving the two threaded rods to approach each other. The two threaded rods drive the two arc-shaped supporting plates to support the lower end of the variable pitch gearbox, so that the variable pitch gearbox is not easy to shake during lifting, preventing the variable pitch gearbox from being bumped during lifting, and thus making lifting safer;

[0019] 3. The lifting device for the variable pitch gearbox of the eccentric wind turbine can squeeze the telescopic airbag through the upward sliding lifting beam, and the nozzle can blow the dust inside the arc-shaped support plate downward through the blowing nozzle, thereby preventing the dust on the inner wall of the arc-shaped support plate from scratching the variable pitch gearbox. Moreover, when the two arc-shaped support plates are about to touch the outer wall of the variable pitch gearbox, the airflow passing through the inner wall of the arc-shaped support plate can also carry away the dust on the outer wall of the variable pitch gearbox, thereby automatically cleaning the outer wall of the variable pitch gearbox.

[0020] 4. The hanger for the variable pitch gearbox of the eccentric wind turbine has an air flow blown out through the air nozzle that flows downward along the inner wall of the arc-shaped support plate. The baffle blocks the air flow at the bottom of the arc-shaped support plate and allows the air flow to flow downward through the gap, thereby preventing the dust on the two arc-shaped support plates from contaminating each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the axonometric structure of a lifting device for an eccentric wind turbine pitch gearbox proposed by the present invention from a first perspective;

[0022] Figure 2 This is a schematic diagram of the axonometric structure from a second perspective of a hanger for an eccentric wind turbine pitch gearbox proposed by the present invention;

[0023] Figure 3 This is a schematic diagram of the main cross-sectional structure of a hanger for an eccentric wind turbine pitch gearbox proposed by the present invention;

[0024] Figure 4 This is a schematic diagram of the first-perspective axonometric structure of a curved support plate of a sling for an eccentric wind turbine pitch gearbox proposed by the present invention;

[0025] Figure 5 This is a schematic diagram of the axonometric structure of a curved support plate of a sling for an eccentric wind turbine pitch gearbox proposed by the present invention from a second perspective;

[0026] Figure 6 The invention proposes a kind of lifting device for eccentric wind turbine pitch gearbox Figure 3 Schematic diagram of the local structure;

[0027] Figure 7 The invention proposes a kind of lifting device for eccentric wind turbine pitch gearbox Figure 3 Enlarged view of part A;

[0028] Figure 8 The invention proposes a kind of lifting device for eccentric wind turbine pitch gearbox Figure 6 Enlarged view of part B.

[0029] In the figure: 1. Hanging beam; 2. Hook; 3. Slide hole; 4. Slide rod; 5. Top plate; 6. Buffer spring; 7. Support foot; 8. Vertical plate; 9. Arc support plate; 10. Internal threaded tube; 11. Threaded rod; 12. Inclined rod; 13. Transmission shaft; 14. Driven gear; 15. Rack; 16. Driving gear; 17. Passive gear; 18. Rubber pad; 19. Nozzle; 20. Blowing nozzle; 21. Telescopic airbag; 22. Exhaust pipe; 23. Intake pipe; 24. Connecting pipe; 25. Groove; 26. Filter plate; 27. Support plate; 28. Baffle; 29. ​​Limit plate; 30. Lifting spring; 31. Arc guide plate; 32. Pulley; 33. Gap. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0031] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0032] Example 1:

[0033] Reference Figures 1-8A sling for a variable pitch gearbox of an eccentric wind turbine comprises a hanging beam 1 with a hook 2 at the lower end, and also comprises: two sets of symmetrically arranged supporting legs 7, both of which are connected to the hanging beam 1 through an elastic lifting mechanism, wherein both sides of the lower end of the hanging beam 1 are fixedly connected with vertical plates 8, and both vertical plates 8 are connected with arc-shaped supporting plates 9 through a telescopic mechanism; two sets of nozzles 19 are respectively fixedly connected to the upper ends of the two arc-shaped supporting plates 9, wherein the lower ends of the two nozzles 19 are fixedly mounted with a plurality of blowing nozzles 20 facing the inner wall of the arc-shaped supporting plate 9.

[0034] When the variable pitch gearbox needs to be hoisted, the hanging beam 1 is moved to the top of the variable pitch gearbox, and then the hanging beam 1 is moved downward horizontally. When the hook 2 can hang the variable pitch gearbox, the hanging beam 1 stops moving downward, and the hook 2 is hung on the hanging ring of the variable pitch gearbox, and then the hanging beam 1 is lifted. The two sets of telescopic mechanisms will drive the two arc-shaped supporting plates 9 to approach each other, so that the two arc-shaped supporting plates 9 are supported on the lower end of the variable pitch gearbox, which can make the variable pitch gearbox less likely to shake during hoisting, prevent the variable pitch gearbox from being bumped during hoisting, and make the hoisting safer. When the variable pitch gearbox is moved to the destination, The suspension beam 1 moves downward, and during the movement, the supporting foot 7 will first touch the ground. At this time, the elastic lifting mechanism can buffer the impact force when landing, thereby effectively protecting the variable pitch gearbox. When the arc-shaped support plates 9 approach each other, the blowing nozzles 20 on the two sets of nozzles 19 will blow the dust inside the arc-shaped support plates 9 downward, thereby preventing the dust on the inner wall of the arc-shaped support plates 9 from scratching the variable pitch gearbox, and when the two arc-shaped support plates 9 are about to be close to the outer wall of the variable pitch gearbox, the airflow passing through the inner wall of the arc-shaped support plates 9 will also take away the dust on the outer wall of the variable pitch gearbox, thereby automatically cleaning the outer wall of the variable pitch gearbox.

[0035] Furthermore, the inner walls of the two arc-shaped support plates 9 are provided with rubber pads 18, and the upper and lower ends of the rubber pads 18 are provided with chamfers. When the two arc-shaped support plates 9 are close to each other, the rubber pads 18 can isolate the arc-shaped support plates 9 to prevent the arc-shaped support plates 9 from scratching the variable pitch gearbox.

[0036] Example 2:

[0037] Reference Figure 1-Figure 3 , which is basically the same as Example 1, further discloses a specific implementation plan of the elastic lifting mechanism.

[0038] The elastic lifting mechanism includes sliding holes 3 arranged on both sides of the suspension beam 1, and sliding rods 4 are slidably connected in the two sliding holes 3, wherein two supporting feet 7 are respectively fixedly connected to the lower ends of the two sliding rods 4, and the tops of the two sliding rods 4 are fixedly connected with top plates 5, and the two top plates 5 are elastically connected to the top of the suspension beam 1 through buffer springs 6.

[0039] When the variable pitch gearbox needs to be hoisted, the hanging beam 1 is moved to the top of the variable pitch gearbox, and then the hanging beam 1 is moved downward horizontally. When the supporting feet 7 support the ground, the hanging beam 1 continues to move downward. The hanging beam 1 will slide downward on the slide bar 4 and stretch the buffer spring 6. When the hook 2 is able to hang the variable pitch gearbox, the hanging beam 1 stops moving downward, and the hook 2 is hung on the hanging ring of the variable pitch gearbox. Then the hanging beam 1 is lifted. The hanging beam 1 will slide upward on the slide bar 4 and compress the buffer spring 6. Until the buffer spring 6 is fully reset, the upward-lifted hanging beam 1 will drive the supporting feet 7 to leave the ground, and the lifting of the variable pitch gearbox can be completed. When the variable pitch gearbox is moved to the destination, the hanging beam 1 is moved downward. During the movement, the supporting feet 7 will first contact the ground and stretch the buffer spring 6 again. The buffer spring 6 can cushion the impact force when landing, thereby effectively protecting the variable pitch gearbox.

[0040] Example 3:

[0041] Reference Figure 1-Figure 5 , which is basically the same as Example 2, further discloses a specific implementation plan of the telescopic mechanism.

[0042] The telescopic mechanism includes an oblique rod 12 slidably connected to the side wall of the vertical plate 8, and the side wall of the vertical plate 8 is also rotatably connected to an internally threaded tube 10 arranged parallel to the oblique rod 12, wherein the internally threaded tube 10 is internally threaded with a threaded rod 11, the arc-shaped support plate 9 is fixedly connected to the oblique rod 12, and the lower end of the threaded rod 11 is rotatably connected to the outer wall of the arc-shaped support plate 9, and a linkage mechanism for driving the internally threaded tube 10 to rotate is provided on the slide rod 4, and the linkage mechanism includes a transmission shaft 13 rotatably connected to the side wall of the vertical plate 8, and a driven gear 14 and a driving gear 16 are fixedly mounted on both ends of the transmission shaft 13, wherein a rack 15 meshing with the driven gear 14 is fixedly mounted on the slide rod 4, and a driven gear 17 meshing with the driving gear 16 is fixedly mounted on the outer wall of the internally threaded tube 10;

[0043] When the hanging beam 1 slides downward on the slide rod 4, the hanging beam 1 will also drive the two vertical plates 8 to move downward synchronously. The two vertical plates 8 will drive the driven gear 14 to slide on the rack 15 through the transmission shaft 13. The driven gear 14 will drive the driving gear 16 to rotate through the transmission shaft 13. The driving gear 16 will drive the internal threaded tube 10 to rotate through the driven gear 17. The two rotating internal threaded tubes 10 will drive the threaded rod 11 away from each other, thereby driving the two arc-shaped supporting plates 9 away from each other. When the hanging beam 1 slides upward, The lifting beam 1 will drive the driven gear 14 to slide in the opposite direction on the rack 15, thereby driving the two threaded rods 11 closer to each other, and the two threaded rods 11 will drive the two arc-shaped supporting plates 9 to be supported on the lower end of the variable pitch gearbox, so that the variable pitch gearbox is not easy to shake during lifting, and the variable pitch gearbox is prevented from being bumped during lifting, thereby making the lifting safer. At the end of the lifting, the downward moving lifting beam 1 will cause the two threaded rods 11 to move away from each other, thereby driving the two arc-shaped supporting plates 9 to automatically detach from the bottom of the variable pitch gearbox.

[0044] Example 4:

[0045] Reference Figures 1-8 , which is basically the same as Example 3, and further discloses a specific implementation scheme of blowing with the blowing nozzle 20.

[0046] A telescopic airbag 21 is fixedly installed between the top plate 5 and the top of the suspension beam 1, and an intake pipe 23 and an exhaust pipe 22 are fixedly installed on the telescopic airbag 21, wherein a one-way valve is fixedly installed in the intake pipe 23 and the exhaust pipe 22, and the exhaust pipe 22 is fixedly connected and communicated with the nozzle 19 through a connecting pipe 24.

[0047] When the suspension beam 1 slides upward, the suspension beam 1 will also squeeze the telescopic airbag 21, and the telescopic airbag 21 will discharge the internal air through the exhaust pipe 22. The exhaust pipe 22 will transport the air to the nozzle 19 through the connecting pipe 24. The nozzle 19 will blow the dust inside the arc support plate 9 downward through the blowing nozzle 20, thereby preventing the dust on the inner wall of the arc support plate 9 from scratching the pitch gearbox, and when the two arc support plates 9 are about to be close to the outer wall of the pitch gearbox, the airflow passing through the inner wall of the arc support plate 9 will also take away the dust on the outer wall of the pitch gearbox, thereby automatically cleaning the outer wall of the pitch gearbox, and when the suspension beam 1 slides downward, the suspension beam 1 will stretch the telescopic airbag 21, and the telescopic airbag 21 will inhale air through the intake pipe 23.

[0048] Furthermore, a groove 25 is provided at the lower end of the suspension beam 1, and the end of the suction pipe 23 extends to the inner top of the groove 25. The lower end of the groove 25 is detachably installed with a filter plate 26. When the suction pipe 23 inhales air, the suction pipe 23 will inhale air into the groove 25, and the groove 25 will filter dust in the air through the filter plate 26, thereby preventing dust in the air from contaminating the telescopic airbag 21.

[0049] Example 5:

[0050] Reference Figure 4-Figure 6 , which is basically the same as Example 4, and further, a specific implementation scheme for preventing dust on the two arc-shaped support plates 9 from contaminating each other is specifically added.

[0051] The lower ends of the two arc-shaped supporting plates 9 are connected to the baffle 28 through an elastic lifting mechanism. A gap 33 is provided between the baffle 28 and the lower end of the arc-shaped supporting plate 9. A pulley 32 is rotatably installed on the top of the baffle 28. The pulley 32 can reduce the friction between the baffle 28 and the outer wall of the pitch gearbox. The elastic lifting mechanism includes support plates 27 fixedly connected to both sides of the lower end of the arc-shaped supporting plate 9. The baffle 28 is longitudinally slidably connected to the two support plates 27. The outer walls of the two baffles 28 are fixedly connected to the limit plates 29, and the limit plates 29 and the support plates 27 are elastically connected by a lifting spring 30.

[0052] When the airflow from the blowing nozzle 20 flows downward along the inner wall of the arc-shaped support plate 9, the baffle 28 will block the airflow and allow the airflow to flow downward through the gap 33, thereby preventing the dust on the two arc-shaped support plates 9 from contaminating each other. When the two arc-shaped support plates 9 approach each other, the two baffles 28 will first reach the bottom of the pitch gearbox, so that the dust blown out from the arc-shaped support plates 9 will not contaminate each other. When the two arc-shaped support plates 9 are completely covered on both sides of the lower end of the pitch gearbox, the baffle 28 will be pressed downward by the pitch gearbox. When the two arc-shaped support plates 9 are detached, the lifting spring 30 will drive the baffle 28 to slide upward and reset.

[0053] Furthermore, the lower ends of the two baffles 28 are fixedly connected to an arc guide plate 31, and the bending direction of the arc guide plate 31 is opposite to the bending direction of the arc support plate 9. When the airflow blows towards the baffle 28, the baffle 28 and the arc guide plate 31 will guide the airflow to both sides of the two arc support plates 9.

[0054] When the lifting device of the variable-pitch gearbox of the eccentric gravity wind turbine is used, the lifting beam 1 is moved to the top of the variable-pitch gearbox, and then the lifting beam 1 is moved downward horizontally. When the supporting feet 7 are supported on the ground, the lifting beam 1 continues to move downward, and the lifting beam 1 slides downward on the sliding rod 4 and stretches the buffer spring 6. When the hook 2 is able to hang the variable-pitch gearbox, the lifting beam 1 stops moving downward, and the hook 2 is hung on the hanging ring of the variable-pitch gearbox, and then the lifting beam 1 is lifted. The lifting beam 1 slides upward on the sliding rod 4 and compresses the buffer spring 6. Until the buffer spring 6 is fully reset, the upward-lifted lifting beam 1 drives the supporting feet 7 to leave the ground, and the lifting of the variable-pitch gearbox is completed. When the variable-pitch gearbox is moved to the destination, the lifting beam 1 is moved downward. During the movement, the supporting feet 7 will first contact the ground and stretch the buffer spring 6 again. The buffer spring 6 can cushion the impact force when landing, thereby effectively protecting the variable-pitch gearbox.

[0055] When the hanging beam 1 slides downward on the slide rod 4, the hanging beam 1 will also drive the two vertical plates 8 to move downward synchronously. The two vertical plates 8 will drive the driven gear 14 to slide on the rack 15 through the transmission shaft 13. The driven gear 14 will drive the driving gear 16 to rotate through the transmission shaft 13. The driving gear 16 will drive the internal threaded tube 10 to rotate through the driven gear 17. The two rotating internal threaded tubes 10 will drive the threaded rod 11 away from each other, thereby driving the two arc-shaped supporting plates 9 away from each other. When the hanging beam 1 slides upward, The lifting beam 1 will drive the driven gear 14 to slide in the opposite direction on the rack 15, thereby driving the two threaded rods 11 closer to each other, and the two threaded rods 11 will drive the two arc-shaped supporting plates 9 to be supported on the lower end of the variable pitch gearbox, so that the variable pitch gearbox is not easy to shake during lifting, and the variable pitch gearbox is prevented from being bumped during lifting, thereby making the lifting safer. At the end of the lifting, the downward moving lifting beam 1 will cause the two threaded rods 11 to move away from each other, thereby driving the two arc-shaped supporting plates 9 to automatically detach from the bottom of the variable pitch gearbox.

[0056] When the suspension beam 1 slides upward, the suspension beam 1 will also squeeze the telescopic airbag 21, and the telescopic airbag 21 will discharge the internal air through the exhaust pipe 22. The exhaust pipe 22 will transport the air to the nozzle 19 through the connecting pipe 24. The nozzle 19 will blow the dust inside the arc support plate 9 downward through the blowing nozzle 20, thereby preventing the dust on the inner wall of the arc support plate 9 from scratching the pitch gearbox, and when the two arc support plates 9 are about to be close to the outer wall of the pitch gearbox, the airflow passing through the inner wall of the arc support plate 9 will also take away the dust on the outer wall of the pitch gearbox, thereby automatically cleaning the outer wall of the pitch gearbox, and when the suspension beam 1 slides downward, the suspension beam 1 will stretch the telescopic airbag 21, and the telescopic airbag 21 will inhale air through the intake pipe 23.

[0057] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A sling for an eccentric wind turbine pitch gearbox, comprising a sling beam (1) with a hook (2) at the lower end, characterized in that: Also includes: Two sets of symmetrically arranged supporting legs (7) are connected to the suspension beam (1) via an elastic lifting mechanism. Wherein, both sides of the lower end of the hanging beam (1) are fixedly connected to vertical plates (8), and both vertical plates (8) are connected to arc-shaped supporting plates (9) via telescopic mechanisms; Two groups of nozzles (19) are fixedly connected to the upper ends of the two arc-shaped support plates (9). Wherein, the lower ends of the two nozzles (19) are fixedly mounted with a plurality of blowing nozzles (20) facing the inner wall of the arc-shaped support plate (9); The elastic lifting mechanism comprises: sliding holes (3) provided on both sides of the suspension beam (1), wherein sliding rods (4) are slidably connected in the two sliding holes (3), The two supporting legs (7) are respectively fixedly connected to the lower ends of the two sliding rods (4), the tops of the two sliding rods (4) are fixedly connected to the tops of the top plates (5), and the two top plates (5) are elastically connected to the tops of the suspension beams (1) via buffer springs (6).

2. The sling for the eccentric wind turbine pitch gearbox according to claim 1, characterized in that: The telescopic mechanism comprises: The inclined rod (12) is slidably connected to the side wall of the vertical plate (8), and the side wall of the vertical plate (8) is also rotatably connected to an internally threaded tube (10) arranged parallel to the inclined rod (12). The internal thread of the internal threaded tube (10) is connected to a threaded rod (11), the arc-shaped support plate (9) is fixedly connected to the inclined rod (12), and the lower end of the threaded rod (11) is rotatably connected to the outer wall of the arc-shaped support plate (9), and the sliding rod (4) is provided with a linkage mechanism for driving the internal threaded tube (10) to rotate.

3. The sling for the eccentric wind turbine pitch gearbox according to claim 2, characterized in that: The linkage mechanism comprises: A transmission shaft (13) connected to the side wall of the vertical plate (8) is rotatably connected, and a driven gear (14) and a driving gear (16) are fixedly mounted on both ends of the transmission shaft (13). A rack (15) meshingly connected to a driven gear (14) is fixedly mounted on the slide rod (4), and a driven gear (17) meshingly connected to a driving gear (16) is fixedly mounted on the outer wall of the internally threaded tube (10).

4. The sling for the eccentric wind turbine pitch gearbox according to claim 1, characterized in that: A telescopic airbag (21) is fixedly mounted between the top plate (5) and the top of the suspension beam (1), and an air intake pipe (23) and an air exhaust pipe (22) are fixedly mounted on the telescopic airbag (21). Wherein, one-way valves are fixedly installed in the intake pipe (23) and the exhaust pipe (22), and the exhaust pipe (22) is fixedly connected and communicated with the nozzle (19) through a connecting pipe (24).

5. The sling for the eccentric wind turbine pitch gearbox according to claim 4, characterized in that: A groove (25) is provided at the lower end of the suspension beam (1), the end of the suction pipe (23) extends to the inner top of the groove (25), and a filter plate (26) is detachably mounted at the lower end of the groove (25).

6. The sling for the eccentric wind turbine pitch gearbox according to claim 1, characterized in that: The lower ends of the two arc-shaped supporting plates (9) are connected to a baffle (28) via an elastic lifting mechanism. A gap (33) is provided between the baffle (28) and the lower end of the arc-shaped supporting plate (9). A pulley (32) is rotatably mounted on the top of the baffle (28).

7. The sling for the eccentric wind turbine pitch gearbox according to claim 6, characterized in that: The elastic lifting mechanism comprises: The baffle (28) is fixedly connected to the support plates (27) on both sides of the lower end of the arc-shaped support plate (9), and the baffle (28) is longitudinally slidably connected to the two support plates (27). The outer walls of the two baffles (28) are both fixedly connected to a limiting plate (29), and the limiting plate (29) is elastically connected to the support plate (27) via a lifting spring (30).

8. The sling for the eccentric wind turbine pitch gearbox according to claim 6, characterized in that: The lower ends of the two baffles (28) are fixedly connected to an arc-shaped guide plate (31), and the bending direction of the arc-shaped guide plate (31) is opposite to the bending direction of the arc-shaped support plate (9).

9. The sling for the eccentric wind turbine pitch gearbox according to claim 1, characterized in that: The inner walls of the two arc-shaped support plates (9) are both provided with rubber pads (18), and the upper and lower ends of the rubber pads (18) are both provided with chamfers.

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