Double-point unloading lifting tool for blades of wind driven generator

Abstract

The invention relates to the technical field of lifting appliances, in particular to a double-point unloading lifting appliance tool for blades of a wind driven generator, which is characterized in that adjusting frames are arranged at two ends of a longitudinal beam, a flat lifting belt is connected between the two adjusting frames, and the flat lifting belt supports the blades of the wind driven generator from bottom to top; a flexible airbag is fixedly adhered to the lower surface of the lifting plate, an annular plate is fixed to the upper surface of the lifting plate, and a communication port is formed in the surface of the lifting plate; a negative pressure cylinder is arranged on the peripheral side of the flexible air bag, and a sealing piston matched with the negative pressure cylinder is installed in an inner cavity of the negative pressure cylinder in a sliding mode. The device has the beneficial effects that a lifting plate is arranged below a longitudinal beam, a lifting disc is vertically installed in an inner cavity of an annular plate in a sliding mode, an inner cavity of a flexible air bag is inflated, the flexible air bag expands and presses down and tightly presses a fan blade, a negative pressure cylinder is adsorbed to the surface of the fan blade, and the fan blade is positioned in the horizontal direction; the device can effectively prevent the fan blade from shaking under the influence of airflow in the air, and the hoisting stability is improved.

Description

Technical Field

[0001] The invention relates to the technical field of hoisting tools, in particular to a double-point unloading hoisting tool for wind turbine blades. Background Art

[0002] The hoist for wind turbine blades is a special equipment used for the safe loading, unloading, transportation and installation of large wind turbine blades. Due to the long length and uneven weight distribution of the blades, the hoist must ensure that the blades are evenly stressed during the lifting process to avoid deformation or damage caused by local stress concentration.

[0003] In the prior art, a Chinese utility model with publication number CN207346969U discloses a horizontal lifting and replacement lifting device for fan blades, which mainly uses a lifting chain in conjunction with a lifting belt. When in use, the lifting belt is wrapped around the root of the blade and then lifted, which can effectively prevent damage to the blade, ensure stable lifting, and effectively tighten the root of the blade to prevent the blade from slipping at high altitude.

[0004] However, at present, after the wind turbine blades are lifted by the slings, the slings can only support the blades. Since the wind turbine blades need to be lifted to a high altitude, the blades are easily shaken by the airflow at high altitude, which causes the position deviation of the sling points of the blades, posing a great safety hazard. Therefore, the present invention proposes a double-point unloading sling tool for wind turbine blades to solve the above problem. Summary of the invention

[0005] The purpose of the present invention is to provide a double-point unloading sling tooling for wind turbine blades to solve the problem mentioned in the above background technology that when the wind turbine blades are hoisted to a high altitude, they are easily affected by airflow and cause shaking, resulting in the deviation of the sling's lifting point on the blade.

[0006] To achieve the above object, the present invention provides the following technical solution: a double-point unloading sling tool for wind turbine blades, comprising a wind turbine blade, a crossbeam is arranged above the wind turbine blade, longitudinal beams are arranged at both ends of the crossbeam, adjustment frames are arranged at both ends of the longitudinal beam, a flat sling is connected between the two adjustment frames, and the flat sling supports the wind turbine blade from bottom to top;

[0007] A lifting plate is provided below the middle of the longitudinal beam, a flexible airbag is fixedly bonded to the lower surface of the lifting plate, an annular plate is fixed to the upper surface of the lifting plate, a connecting port is provided on the surface of the lifting plate, and the connecting port connects the inner cavity of the flexible airbag and the inner cavity of the annular plate, and a lifting plate is slidably installed in the inner cavity of the annular plate;

[0008] A negative pressure cylinder is arranged on the peripheral side of the flexible airbag. A sealing piston adapted thereto is slidably installed in the inner cavity of the negative pressure cylinder. A piston rod is fixed in the middle of the sealing piston. An X-shaped frame is arranged on the upper surface of the lifting plate. The upper end of the piston rod penetrates through the top of the negative pressure cylinder and is fixedly connected to the X-shaped frame.

[0009] Preferably, convex plates are fixed at the edges of the lifting plate. Mounting holes are formed through the ends of the convex plates. The upper end of the piston rod movably penetrates through the inner cavity of the mounting holes. A compression spring is arranged between the lower surface of the convex plate and the top of the negative pressure cylinder, and the upper and lower ends of the compression spring are respectively fixedly connected to the convex plate and the negative pressure cylinder.

[0010] Preferably, the X-shaped frame is fixedly connected to the lifting plate by bolts. The ends of the X-shaped frame are vertically bent downward twice to form a "Z"-shaped connecting frame. The lower surface of the connecting frame is attached to the surface of the convex plate. The end of the connecting frame is fixedly connected to the upper end of the piston rod by a countersunk head bolt.

[0011] Preferably, the lifting plate is of a hollow structure and has an opening at the lower side. The outer side wall of the lifting plate is attached to the inner side wall of the annular plate, and a sealing layer is arranged between them. Guide holes are formed through the middle parts of both the X-shaped frame and the lifting plate. A guide tube is fixedly installed in the middle of the surface of the lifting plate. The lower end opening of the guide tube is communicated with the inner cavity of the flexible airbag. The upper end of the guide tube movably penetrates through the guide hole, and a sealing layer is arranged between them.

[0012] Preferably, a mounting seat is fixedly installed on the lower side of the middle part of the longitudinal beam. An air inlet flow channel is arranged inside the mounting seat. The upper end of the guide tube is fixedly communicated with a corrugated pipe. The upper end of the corrugated pipe extends into the mounting seat and is fixed to it. The inner cavity of the upper end of the corrugated pipe is communicated with the air inlet flow channel. A receiving groove corresponding to the upper end of the guide tube is formed by the downward depression of the middle part of the lower surface of the mounting seat.

[0013] Preferably, a lifting cylinder is fixed at the edge of the surface of the mounting seat. The lifting cylinder is vertically arranged, and its movable end is fixed at the edge of the surface of the lifting plate. A plurality of lifting cylinders are arranged and distributed in an annular array around the center of the lifting plate.

[0014] Preferably, the adjusting frame is arranged in an inverted "C" shape, and both lower ends of the adjusting frame are bent outward. A binding belt is arranged above the adjusting frame, and both ends of the binding belt are respectively fixed to both sides of the adjusting frame. The adjusting frame is suspended below the longitudinal beam through the binding belt. Lifting lugs are fixedly arranged at both ends of the upper side of the longitudinal beam.

[0015] Preferably, a suspension shaft is horizontally and penetratingly arranged in the middle of the adjusting frame. An installation sleeve is movably sleeved outside the suspension shaft. The end of the flat sling is sleeved outside the installation sleeve. A horizontal air cylinder is fixed on the side surface of the adjusting frame, and the movable end of the horizontal air cylinder is fixedly connected with one end of the suspension shaft.

[0016] Preferably, a guiding beam is fixedly installed on the lower side of the longitudinal beam, and the cross-section of the guiding beam is in a "middle" shape. A guiding card slot is penetratingly opened at the top of the adjusting frame, and the guiding card slot is adapted to the guiding beam. The adjusting frame is slidably clamped outside the guiding beam through the guiding card slot, and the top surface of the adjusting frame is set to be a circular arc concentric with the longitudinal beam.

[0017] Preferably, the lower end of the negative pressure cylinder is turned outwards to form an annular flange, and the annular flange is attached to the upper surface of the fan blade. An annular sealing pad is bonded to the lower surface of the annular flange.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] In the present invention, a lifting plate is arranged below the longitudinal beam. A flexible airbag is arranged on the lower surface of the lifting plate. An annular plate is fixedly installed in the middle of the upper surface of the lifting plate, and a lifting disc is vertically and slidably installed in the inner cavity of the annular plate. A communication port is opened on the surface of the lifting plate for communicating the inner cavity of the annular plate. An X-shaped frame is fixed on the surface of the lifting disc. When the whole lifting plate moves downwards, the negative pressure cylinder is attached to the surface of the fan blade, and then the flexible airbag is inflated. The flexible airbag expands and presses down on the fan blade to tightly press it. Cooperating with the flat sling, the vertical positioning of the fan blade can be realized. At the same time, the lifting disc drives the X-shaped frame to move upwards under the action of air pressure, and further drives the piston rod to move upwards, so that a negative pressure is formed in the inner cavity of the negative pressure cylinder, and the negative pressure cylinder adsorbs on the surface of the fan blade to realize the horizontal positioning of the fan blade. This device can effectively prevent the fan blade from shaking under the influence of air flow at high altitude and improve the stability of hoisting. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a front view of the overall structure of the present invention;

[0021] Figure 2 is a three-dimensional view of the overall structure of the present invention;

[0022] Figure 3 is an installation diagram of the structure of the adjusting frame of the present invention;

[0023] Figure 4 is a hoisting diagram of the fan blade by the flat sling of the present invention;

[0024] Figure 5 is a three-dimensional view of the flexible airbag and negative pressure cylinder structure of the present invention;

[0025] Figure 6It is a schematic cross-sectional view of the flexible airbag and negative pressure tube structure of the present invention;

[0026] Figure 7 This is a schematic diagram of the explosion of the negative pressure cylinder structure of the present invention;

[0027] Figure 8 It is a three-dimensional schematic diagram of the lifting plate structure of the present invention;

[0028] Figure 9 It is a three-dimensional schematic diagram of the X-shaped frame structure of the present invention;

[0029] Figure 10 This is an exploded schematic diagram of the regulating frame structure of the present invention;

[0030] Figure 11 It is a schematic cross-sectional view of the adjusting frame structure of the present invention.

[0031] In the figure: 1. fan blade; 2. cross beam; 21. longitudinal beam; 211. lifting ear; 212. guide beam; 3. mounting seat; 31. lifting plate; 311. convex plate; 312. mounting hole; 313. annular plate; 314. connecting port; 32. flexible air bag; 33. negative pressure cylinder; 331. sealing piston; 332. piston rod; 333. compression spring; 334. annular flange; 335. annular sealing gasket; 34. bellows; 35. X-shaped frame; 351. connecting frame; 352. guide hole; 353. countersunk bolt; 36. lifting cylinder; 37. lifting plate; 38. guide pipe; 39. intake air duct; 4. adjusting frame; 41. flat sling; 42. tightening belt; 43. suspension shaft; 44. mounting sleeve; 45. horizontal cylinder; 46. guide slot. DETAILED DESCRIPTION

[0032] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figures 1 to 11 , the present invention provides a technical solution:

[0034] Embodiment 1, a double-point unloading lifting tool for wind turbine blades, comprising a wind turbine blade 1, a crossbeam 2 is arranged above the wind turbine blade 1, longitudinal beams 21 are arranged at both ends of the crossbeam 2, and the crossbeam 2 and the two longitudinal beams 21 form an "I"-shaped structure, so as to facilitate double-point lifting and unloading of the wind turbine blade 1;

[0035] Specifically, adjustment frames 4 are provided at both ends of the longitudinal beam 21. A flat sling 41 is connected between the two adjustment frames 4, and the flat sling 41 supports the fan blade 1 from bottom to top. The flat sling 41 can adapt to the arc structure of the surface of the fan blade 1 without damaging the lower surface of the fan blade 1. The two ends of the flat sling 41 open outward to form a "C" - shaped structure with an upward opening, which can achieve a good lifting effect when facing a fan blade 1 with a larger width;

[0036] Secondly, a lifting plate 31 is provided below the middle of the longitudinal beam 21. The lifting plate 31 can be lifted to change its own height position. The lifting plate 31 is located between the longitudinal beam 21 and the fan blade 1. A flexible airbag 32 is fixedly bonded to the lower surface of the lifting plate 31. The flexible airbag 32 is a flexible structure and can deform itself. When the lifting plate 31 approaches the fan blade 1 from top to bottom, the flexible airbag 32 can press on the upper surface of the fan blade 1. An annular plate 313 is fixed on the upper surface of the lifting plate 31. A communication port 314 is provided on the surface of the lifting plate 31, and the communication port 314 communicates the inner cavity of the flexible airbag 32 and the inner cavity of the annular plate 313. A lifting disc 37 is slidably installed in the inner cavity of the annular plate 313. By inflating the inner cavity of the flexible airbag 32, the flexible airbag 32 can expand downward, thereby realizing the pressing of the upper surface of the fan blade 1. And during the inflation process, part of the gas can pass through the communication port 314 and enter the inner cavity of the annular plate 313. At this time, the lifting disc 37 can slide upward under the action of air pressure;

[0037] Furthermore, a negative - pressure cylinder 33 is provided on the peripheral side of the flexible airbag 32. A sealing piston 331 adapted to it is slidably installed in the inner cavity of the negative - pressure cylinder 33. A piston rod 332 is fixed in the middle of the sealing piston 331. An X - shaped frame 35 is provided on the upper surface of the lifting disc 37. The upper end of the piston rod 332 penetrates through the top of the negative - pressure cylinder 33 and is fixedly connected to the X - shaped frame 35. When the lifting disc 37 moves upward under the action of air pressure, the X - shaped frame 35 moves upward accordingly and drives the piston rod 332 to move upward. At this time, the sealing piston 331 slides upward in the inner cavity of the negative - pressure cylinder 33, making the lower inner cavity of the negative - pressure cylinder 33 form a negative pressure, so as to facilitate the negative - pressure cylinder 33 to adsorb on the surface of the fan blade 1, realizing the horizontal positioning of the fan blade 1 and preventing the fan blade 1 from shaking under the influence of air flow in the high altitude;

[0038] When the device is in use, first, the fan blade 1 is supported by the flat sling 41. Then, the lifting plate 31 is moved downward until the negative pressure cylinder 33 fits on the surface of the fan blade 1. Then, the flexible airbag 32 is inflated. At this time, the flexible airbag 32 expands and presses down on the fan blade 1. At the same time, the lifting disc 37 moves upward under the action of air pressure and pushes the X-shaped frame 35 upward, thereby driving the piston rod 332 and the sealing piston 331 upward, so that a negative pressure is formed in the lower end inner cavity of the negative pressure cylinder 33 and it is adsorbed on the surface of the fan blade 1. Through the cooperation of the flexible airbag 32 and the negative pressure cylinder 33, the fan blade 1 can be positioned, ensuring that the fan blade 1 is more stable in the air, avoiding shaking due to the influence of air flow, and reducing potential safety hazards.

[0039] For the installation of the negative pressure cylinder 33 and the piston rod 332, the present application also has a convex plate 311 fixed at the edge of the lifting plate 31. An installation hole 312 is penetrated through the end of the convex plate 311. The upper end of the piston rod 332 movably penetrates through the inner cavity of the installation hole 312. The convex plate 311 is provided for horizontally positioning the piston rod 332, so that the piston rod 332 can only slide up and down in the vertical direction. A compression spring 333 is arranged between the lower surface of the convex plate 311 and the top of the negative pressure cylinder 33, and the upper and lower ends of the compression spring 333 are respectively fixedly connected to the convex plate 311 and the negative pressure cylinder 33. When the compression spring 333 is arranged, it is mainly used to press down the negative pressure cylinder 33. When the lifting plate 31 moves downward and approaches the fan blade 1, the negative pressure cylinder 33 can be pressed against and fitted to the fan blade 1 under the elastic force of the compression spring 333. In addition, the negative pressure cylinder 33 and the piston rod 332 are both corresponding to the installation hole 312. Therefore, the horizontal position of the negative pressure cylinder 33 itself can be kept stable. When the negative pressure cylinder 33 adsorbs the fan blade 1 by negative pressure, the horizontal position of the fan blade 1 can be stabilized.

[0040] To limit the upward movement stroke of the lifting disc 37, the X-shaped frame 35 of the present application is fixedly connected to the lifting disc 37 by bolts. Therefore, when the lifting disc 37 slides up and down under the influence of the air pressure in the inner cavity of the annular plate 313, the lifting disc 37 can drive the X-shaped frame 35 to move up and down accordingly. The end of the X-shaped frame 35 is vertically bent downward twice to form a "Z"-shaped connecting frame 351. The lower surface of the connecting frame 351 is attached to the surface of the convex plate 311. The end of the connecting frame 351 is fixedly connected to the upper end of the piston rod 332 by a countersunk head bolt 353. The setting of the connecting frame 351 is mainly used to install and fix the piston rod 332. And when the connecting frame 351 is attached to the convex plate 311, the lifting disc 37 just completely slides down into the inner cavity of the annular plate 313. When the lifting disc 37 slides upward, the X-shaped frame 35, the X-shaped frame 35 and the piston rod 332 move upward accordingly. The upward movement stroke of the piston rod 332 itself is limited. Therefore, the upward movement stroke of the lifting disc 37 can be limited, thus avoiding the complete separation of the lifting disc 37 from the annular plate 313 and resulting in the leakage of the gas in the inner cavity of the annular plate 313.

[0041] To charge and discharge gas into the inner cavity of the flexible airbag 32, the lifting disc 37 of the present application is of a hollow structure and has an opening on the lower side. Therefore, the air pressure in the inner cavity of the annular plate 313 will affect the up and down position of the lifting disc 37. The outer side wall of the lifting disc 37 is attached to the inner side wall of the annular plate 313, and a sealing layer is provided between the two, which can be used to prevent the gas in the inner cavities of the annular plate 313 and the lifting disc 37 from leaking. A guide hole 352 is penetrated through the middle of both the X-shaped frame 35 and the lifting disc 37. A guide tube 38 is fixedly installed in the middle of the surface of the lifting plate 31. The lower end opening of the guide tube 38 is communicated with the inner cavity of the flexible airbag 32. The upper end of the guide tube 38 movably penetrates through the guide hole 352, and a sealing layer is provided between the two. The setting of the guide tube 38 is mainly used to convey gas into or extract gas from the inner cavity of the flexible airbag 32. The setting of the guide hole 352 can extend the upper end of the guide tube 38 above the X-shaped frame 35, so as to facilitate the external air pump to charge and discharge gas to the guide tube 38.

[0042] To convey gas into the inner cavity of the guiding pipe 38, the present application further includes a mounting seat 3 fixedly installed on the lower side of the middle part of the longitudinal beam 21. An air inlet flow channel 39 is arranged inside the mounting seat 3. The upper end of the guiding pipe 38 is fixedly communicated with a corrugated pipe 34. The upper end of the corrugated pipe 34 extends into the mounting seat 3 and is fixed thereto. The inner cavity at the upper end of the corrugated pipe 34 is in communication with the air inlet flow channel 39. A receiving groove corresponding to the upper end of the guiding pipe 38 is formed by the middle part of the lower surface of the mounting seat 3 being recessed upward. Since the guiding pipe 38 itself is fixedly connected to the lifting plate 31, when the lifting plate 31 moves up and down, the guiding pipe 38 will be driven to move up and down accordingly. And the corrugated pipe 34 itself can be folded and telescoped, thus well avoiding the possibility of collision between the guiding pipe 38 and the mounting seat 3. And since the upper end of the corrugated pipe 34 is fixed in the inner cavity of the mounting seat 3, the gas conveyed by the air inlet flow channel 39 can stably pass through the corrugated pipe 34 and the guiding pipe 38 and be conveyed into the inner cavity of the flexible airbag 32.

[0043] To adjust and control the height position of the lifting plate 31, the present application further includes a lifting cylinder 36 fixedly installed at the edge of the surface of the mounting seat 3. The lifting cylinder 36 is vertically arranged, and its movable end is fixed to the edge of the surface of the lifting plate 31. A plurality of lifting cylinders 36 are provided and are distributed in an annular array around the center of the lifting plate 31. The lifting cylinder 36 is controlled by a controller known in the prior art. It is mainly used to adjust the height position of the lifting plate 31. And by providing a plurality of lifting cylinders 36, not only can the stability of the lifting of the lifting plate 31 be improved, but also the rotation of the lifting plate 31 itself can be prevented. Therefore, after the negative pressure cylinder 33 sucks the fan blade 1 by negative pressure, the horizontal position of the fan blade 1 itself can be kept in good stability.

[0044] To install the adjusting frame 4, the adjusting frame 4 of the present application is set in an inverted "C" shape, and both lower ends of the adjusting frame 4 are bent outward. A tightening belt 42 is arranged above the adjusting frame 4, and both ends of the tightening belt 42 are respectively fixed to both sides of the adjusting frame 4. The adjusting frame 4 is suspended below the longitudinal beam 21 through the tightening belt 42. The tightening belt 42 itself is in an inverted "U" shape and buckles on the outside of the longitudinal beam 21. When the device has not lifted the fan blade 1 yet, the adjusting frame 4 and the tightening belt 42 can be adjusted in position along the length direction of the longitudinal beam 21 to ensure the stability after the fan blade 1 is lifted. At both ends of the upper side of the longitudinal beam 21, lifting lugs 211 are fixedly arranged to facilitate a hoisting machine such as a tower crane to hoist the whole device.

[0045] In order to facilitate the separation of the flat sling 41 of the device from the fan blade 1 at high altitude, a suspension shaft 43 is horizontally penetrated through the middle of the adjustment frame 4 of the present application. An installation sleeve 44 is movably sleeved outside the suspension shaft 43. The end of the flat sling 41 is sleeved outside the installation sleeve 44. A horizontal cylinder 45 is fixed on the side of the adjustment frame 4, and the movable end of the horizontal cylinder 45 is fixedly connected to one end of the suspension shaft 43. As Figure 10 shown, the installation sleeve 44 is located in the middle of the inner side of the adjustment frame 4 itself. After the suspension shaft 43 movably penetrates through the installation sleeve 44, the position of the installation sleeve 44 itself is stable. The end of the adjustment frame 4 is pre-sleeved and tightly fixed outside the installation sleeve 44 to facilitate the connection between the flat sling 41 and the adjustment frame 4. When the fan blade 1 is installed at high altitude, by controlling the contraction of the horizontal cylinder 45 to drive the suspension shaft 43 to slide, the installation sleeve 44 can be separated from the suspension shaft 43. At this time, the installation sleeve 44 can naturally separate from the adjustment frame 4 under the action of gravity, thereby releasing the support of the flat sling 41 on the fan blade 1. It should be noted that the horizontal cylinder 45 is only provided on one adjustment frame 4 at one end of the longitudinal beam 21, that is, only one end of the flat sling 41 can be separated from the adjustment frame 4, and the other end of the flat sling 41 still remains connected to another adjustment frame 4. In addition, in order to prevent the surface of the fan blade 1 from being damaged when the installation sleeve 44 falls, the surface corners and exposed parts of the installation sleeve 44 of the device need to be covered with a flexible buffer layer, such as materials known in the prior art such as sponge and rubber, which will not be elaborated here.

[0046] In order to guide the sliding of the adjustment frame 4, the present application also has a guiding beam 212 fixedly installed on the lower side of the longitudinal beam 21, and the cross-section of the guiding beam 212 is in the shape of a "zhong" character. A guiding slot 46 is penetrated through the top of the adjustment frame 4, and the guiding slot 46 is adapted to the guiding beam 212. The adjustment frame 4 is slidably clamped outside the guiding beam 212 through the guiding slot 46. The cooperation between the guiding beam 212 and the guiding slot 46 can be used to guide the horizontal sliding of the adjustment frame 4 and ensure that the adjustment frame 4 itself is always in a vertical placement state, avoiding the inclination of the adjustment frame 4 caused by the traction force of the flat sling 41 on the adjustment frame 4. The top surface of the adjustment frame 4 is set to be a circular arc concentric with the longitudinal beam 21 to prevent the adjustment frame 4 from colliding with the cross beam 2.

[0047] In order to improve the adsorption effect of the negative pressure cylinder 33 on the fan blade 1, the lower end of the negative pressure cylinder 33 of the present application is turned outwards to form an annular flange 334, and the annular flange 334 is attached to the upper surface of the fan blade 1. An annular gasket 335 is bonded to the lower surface of the annular flange 334. As Figure 7As shown, the setting of the annular flange 334 increases the contact area between the lower end opening of the negative pressure cylinder 33 and the surface of the fan blade 1. The annular gasket 335 is a flexible structure itself and can better fit the surface of the fan blade 1, thus avoiding the situation that the lower end opening of the negative pressure cylinder 33 cannot fit and negatively pressure adsorb the fan blade 1 due to the surface of the fan blade 1 being a curved surface.

[0048] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double-point unloading lifting tooling for a wind turbine blade, comprising a wind turbine blade (1), a cross beam (2) is arranged above the wind turbine blade (1), and longitudinal beams (21) are arranged at both ends of the cross beam (2), characterized in that: Adjusting frames (4) are provided at both ends of the longitudinal beam (21), and a flat sling (41) is connected between the two adjusting frames (4), and the flat sling (41) supports the fan blade (1) from bottom to top; A lifting plate (31) is provided below the middle of the longitudinal beam (21). A flexible airbag (32) is fixedly adhered to the lower surface of the lifting plate (31). An annular plate (313) is fixed on the upper surface of the lifting plate (31). A communication port (314) is formed on the surface of the lifting plate (31), and the communication port (314) communicates with the inner cavity of the flexible airbag (32) and the inner cavity of the annular plate (313). A lifting disc (37) is slidably installed in the inner cavity of the annular plate (313); A negative pressure cylinder (33) is provided on the peripheral side of the flexible airbag (32). A sealing piston (331) adapted to it is slidably installed in the inner cavity of the negative pressure cylinder (33). A piston rod (332) is fixed in the middle of the sealing piston (331). An X-shaped frame (35) is provided on the upper surface of the lifting disc (37). The upper end of the piston rod (332) penetrates through the top of the negative pressure cylinder (33) and is fixedly connected to the X-shaped frame (35).

2. The double-point unloading spreader tooling for a wind turbine blade according to claim 1, characterized in that: A convex plate (311) is fixed at the edge of the lifting plate (31). A mounting hole (312) is formed through the end of the convex plate (311). The upper end of the piston rod (332) movably penetrates through the inner cavity of the mounting hole (312). A compression spring (333) is provided between the lower surface of the convex plate (311) and the top of the negative pressure cylinder (33), and the upper and lower ends of the compression spring (333) are fixedly connected to the convex plate (311) and the negative pressure cylinder (33) respectively.

3. The double-point unloading spreader tooling for a wind turbine blade according to claim 2, characterized in that: The X-shaped frame (35) is fixedly connected to the lifting disc (37) by bolts. The end of the X-shaped frame (35) is vertically bent downward twice to form a "Z"-shaped connecting frame (351). The lower surface of the connecting frame (351) fits against the surface of the convex plate (311). The end of the connecting frame (351) is fixedly connected to the upper end of the piston rod (332) by a countersunk head bolt (353).

4. A double-point unloading spreader tooling for a wind turbine blade according to claim 3, characterized in that: The lifting disc (37) is of a hollow structure and has an opening on the lower side. The outer side wall of the lifting disc (37) fits against the inner side wall of the annular plate (313), and a sealing layer is provided between the two. Guide holes (352) are formed through the middle of both the X-shaped frame (35) and the lifting disc (37). A guide tube (38) is fixedly installed in the middle of the surface of the lifting plate (31). The lower end opening of the guide tube (38) communicates with the inner cavity of the flexible airbag (32). The upper end of the guide tube (38) movably penetrates through the guide hole (352), and a sealing layer is provided between the two.

5. A double-point unloading spreader tooling for a wind turbine blade according to claim 4, characterized in that: A mounting seat (3) is fixedly installed on the lower side of the middle part of the longitudinal beam (21). An air inlet flow channel (39) is arranged inside the mounting seat (3). The upper end of the guiding pipe (38) is fixedly communicated with a corrugated pipe (34). The upper end of the corrugated pipe (34) extends into the mounting seat (3) and is fixed thereto. The inner cavity at the upper end of the corrugated pipe (34) is in communication with the air inlet flow channel (39). A receiving groove corresponding to the upper end of the guiding pipe (38) is formed by the downward depression of the middle part of the lower surface of the mounting seat (3).

6. The double-point unloading spreader tooling for a wind turbine blade according to claim 5, characterized in that: Lifting cylinders (36) are fixed at the edge of the surface of the mounting seat (3). The lifting cylinders (36) are vertically arranged, and the movable ends are fixed at the edge of the surface of a lifting plate (31). A plurality of lifting cylinders (36) are provided and are distributed in an annular array around the center of the lifting plate (31).

7. A double-point unloading spreader tooling for a wind turbine blade according to claim 1, characterized in that: The adjusting frame (4) is arranged in an inverted "C" shape, and both lower ends of the adjusting frame (4) are bent outwards. A tightening belt (42) is arranged above the adjusting frame (4), and both ends of the tightening belt (42) are respectively fixed on both sides of the adjusting frame (4). The adjusting frame (4) is suspended under the longitudinal beam (21) through the tightening belt (42). Lifting lugs (211) are fixedly arranged at both ends of the upper side of the longitudinal beam (21).

8. A double-point unloading spreader tooling for a wind turbine blade according to claim 7, characterized in that: A suspension shaft (43) is horizontally penetrated through the middle part of the adjusting frame (4). An installation sleeve (44) is movably sleeved on the outer side of the suspension shaft (43). The end of the flat sling (41) is sleeved on the outer side of the installation sleeve (44). A horizontal cylinder (45) is fixed to the side surface of the adjusting frame (4), and the movable end of the horizontal cylinder (45) is fixedly connected with one end of the suspension shaft (43).

9. A double-point unloading lifting tooling for a wind turbine blade according to claim 8, characterized in that: A guiding beam (212) is fixedly installed on the lower side of the longitudinal beam (21), and the cross section of the guiding beam (212) is in a "middle" shape. A guiding slot (46) is penetrated through the top of the adjusting frame (4), and the guiding slot (46) is adapted to the guiding beam (212). The adjusting frame (4) is slidably clamped on the outer side of the guiding beam (212) through the guiding slot (46). The top surface of the adjusting frame (4) is arranged in a circular arc shape concentric with the longitudinal beam (21).

10. A double-point unloading spreader tooling for a wind turbine blade according to claim 1, characterized in that: The lower end of the negative pressure cylinder (33) is turned outwards to form an annular flange (334), and the annular flange (334) is attached to the upper surface of the fan blade (1). An annular sealing gasket (335) is bonded to the lower surface of the annular flange (334).

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