A pneumatic lifting device for large wind turbine blades

Abstract

An embodiment of the present invention discloses a pneumatic lifting device for large wind turbine blades, comprising a main frame, a lever assembly, a triangular plate assembly, a lifting assembly, and a pneumatic assembly. The main frame is in an equilateral triangle structure, and the lever assembly is installed under each corner of the main frame. The triangular plate assembly is installed under both ends of the lever assembly. The triangular plate assembly is in an equilateral triangle structure, and the lifting assembly is installed under each corner of the triangular plate assembly. The lifting assembly has a circular ring, and the lever assembly is provided with a pneumatic assembly, which provides negative pressure for the circular ring. By adopting the present invention, the safe lifting and disassembly process of large blades can be realized by utilizing pneumatic control, and the blades can be automatically disassembled after the handling and lifting process is completed without the need for close operation by staff, thereby realizing the lifting, lifting, and handling process of larger-sized blades and meeting many operating conditions.

Description

Technical Field

[0001] The present invention relates to a new energy equipment installation device, in particular to a large-scale wind turbine blade pneumatic lifting device. Background Art

[0002] In the field of green new energy, wind power generation is entering a period of rapid development, which is of great significance to my country's early realization of carbon peak and carbon neutrality. With the rapid increase in the capacity of single wind turbines, the length of huge wind turbine blades has exceeded 80 meters, and the blades of large offshore wind turbines have even exceeded 100 meters. How to ensure the smooth and safe lifting, hoisting, installation, transportation, and disassembly of extremely long and heavy blades has become the most critical technical difficulty facing my country's wind power industry. The blades themselves are very expensive, and the blade surface requires special protection to ensure the smooth passage of wind. Stress concentration during the lifting and handling process may cause localized damage to the blades. Any damage to the blades during the lifting process will result in huge economic losses. Therefore, how to safely, reliably and effectively realize the lifting process of large wind turbine blades, achieve as even load distribution as possible to reduce stress concentration, and reduce the risks brought by human operation during the operation process is necessary. It is of great value to develop a safe and reliable large wind turbine blade lifting device that can realize automatic assembly.

[0003] Existing large wind turbine blade lifting devices have the following characteristics: Four sets of lifting ropes are typically inserted into the base of the blade. A frame structure then pulls up the lifting devices distributed above the blade to achieve blade installation. Blade installation requires manual adjustment of the correct positioning of the four sets of lifting ropes. Misalignment can cause the blade to tip over or even slide and damage. Excessive number of lifting ropes can lead to overconstraint, resulting in loose connections between some of the ropes. Too few lifting ropes can lead to excessive localized stress, potentially damaging the base of the blade. Blade installation and lifting devices typically require manual operation, posing significant safety risks. If a blade tilts or slides, it can be life-threatening. After being installed on the hub at high altitude, the blade becomes trapped in the installation and removal process, with the lifting device unable to be accessed and requiring remote control. Failure to remove the lifting device, or stress concentrations in certain locations preventing the device from being properly separated from the large blade, undoubtedly poses a significant safety hazard. Summary of the Invention

[0004] The technical problem to be solved by the embodiments of the present invention is to provide a pneumatic lifting device for large wind turbine blades. This device utilizes pneumatic pressure control to safely lift and remove large blades. After the lifting and transport process is complete, the blades can be automatically removed without requiring close operator intervention. This allows for the lifting, support, and transport of large blades, meeting various operating conditions.

[0005] In order to solve the above technical problems, an embodiment of the present invention provides a large-scale wind turbine blade pneumatic lifting device, comprising a main frame (1), a lever assembly (2), a triangular plate assembly (3), a lifting assembly (4) and a pneumatic assembly (5), wherein the main frame (1) is in an equilateral triangle structure, the lever assembly (2) is installed under each corner of the main frame (1), the triangular plate assembly (3) is installed under both ends of the lever assembly (2), the triangular plate assembly (3) is in an equilateral triangle structure, the lifting assembly (4) is installed under each corner of the triangular plate assembly (3), the lifting assembly (4) has a circular ring, the lever assembly (2) is provided with a pneumatic assembly (5), and the pneumatic assembly (5) provides negative pressure for the circular ring.

[0006] The main frame (1) comprises an outer frame (1.1), a cylinder (1.2), a lifting ring (1.3) and an inner frame (1.4); the inner frame (1.4) is located inside the outer frame (1.1) and is fixedly connected to the inner side surface thereof; the cylinder (1.2) is arranged at the center of the outer frame (1.1) and is fixedly connected to the inner frame (1.4); and the lifting ring (1.3) is installed on the upper part of the cylinder (1.2).

[0007] The outer frame (1.1) comprises three outer square steels (1.1.1) forming an equilateral triangle, the cylinder (1.2) is arranged at the center of the equilateral triangle, and the inner frame (1.4) comprises three short square steels (1.4.1) and three long square steels (1.4.2), wherein the short square steels (1.4.1) are fixed at the midpoints of the side surfaces of the cylinder (1.2) and the outer square steels (1.1.1), and the long square steels (1.4.2) are fixed at the vertices of the side surfaces of the cylinder (1.2) and the outer square steels (1.1.1).

[0008] There are three lever assemblies (2) in total, which are symmetrically distributed under each corner of the peripheral frame (1.1) and are parallel to the base of the equilateral triangle structure.

[0009] The lever assembly (2) comprises a connecting plate (2.1), a side mounting plate (2.2), a central shaft (2.3), a lever square steel (2.4), a spacer (2.5), a bearing (2.6), a locking nut (2.7) and a connecting ball rod (2.8); the side mounting plate (2.2) is mounted on the lower part of the connecting plate (2.1); there are two bearings (2.6), which are respectively arranged in the circular holes of the connecting plate (2.1) and the side mounting plate (2.2); the central shaft (2.3) is mounted in the middle of the two groups of bearings (2.6); there are two locking nuts (2.7), which are symmetrically distributed on the outside of the connecting plate (2.1) and the side mounting plate (2.2) and are used to fix the axial position of the central shaft (2.3); the connecting ball rods (2.8) are symmetrically distributed on both sides of the lever square steel (2.4); and the connecting plate (2.1) is used to be connected to the corners of the peripheral frame (1.1).

[0010] The triangular plate assembly (3) comprises a large square steel (3.1), an inner circular disc (3.2), three oblique rectangular steels (3.4) and three oblique short square steels (3.3), wherein the large square steel (3.1) forms an equilateral triangle, the inner circular disc (3.2) is arranged at the center of the equilateral triangle, the oblique rectangular steel (3.4) and the oblique short square steel (3.3) are installed between the large square steel (3.1) and the inner circular disc (3.2), and the inner circular disc (3.2) is connected to both ends of the lever assembly (2).

[0011] The lifting assembly (4) comprises a ball screw (4.1), a circular ring (4.2), a locking nut (4.3) and a polytetrafluoroethylene pad (4.4), wherein the ball screw (4.1) is connected to the upper part of the circular ring (4.2) through a thread and is locked by the locking nut (4.3), the polytetrafluoroethylene pad (4.4) is installed at the lower part of the circular ring (4.2), and the upper part of the ball screw (4.1) is connected to the corner of the triangular plate assembly (3).

[0012] The pneumatic assembly (5) comprises an air compressor (5.1) mounted on the upper portion of the lever assembly (2) and a vent pipe arranged inside the lever assembly (2), the triangular plate assembly (3) and the lifting assembly (4), wherein the vent pipe connects the ring with the air compressor (5.1).

[0013] When the pneumatic assembly (5) is hoisting the blade, the air compressor (5.1) in the pneumatic assembly (5) sucks away the air at the bottom of the lifting assembly (4) through the vent pipe, and firmly fixes the blade to the bottom of the lifting assembly (4) by the action of the external atmospheric pressure; conversely, when the blade is dismantled, the air compressor (5.1) in the pneumatic assembly (5) re-discharges the air at the bottom of the lifting assembly (4) through the vent pipe, thereby separating the blade from the blade pneumatic lifting device.

[0014] The implementation of the embodiment of the present invention has the following beneficial effects: the present invention utilizes eighteen lifting assemblies evenly distributed around the circumference to achieve uniform bearing of the gravity load of large blades. The eighteen lifting assemblies are arranged in two circles, with six groups evenly distributed around the inner circle and twelve evenly distributed around the outer circle. During the blade lifting process, the blade is supported by multiple support points, the support force is evenly dispersed, the position is reliable and stable, and stress concentration caused by excessive local stress is avoided to cause local damage to the blade surface, as well as dangerous working conditions such as sliding and tipping, thereby ensuring the safety and reliability of the lifting process. In order to achieve uniform distribution of support force, one lifting assembly on the inner circle and two lifting assemblies on the outer circle are installed on the triangular plate assembly to form an equilateral triangle. Each two triangular plate assemblies are connected by a lever assembly. The degree of freedom of the lifting assembly is released by releasing the rotational freedom between the triangular plate assembly and the lifting assembly and the swinging freedom of the lever assembly. As a result of this design, the six lifting assemblies on the inner circle circumference form a large support point. When the blades are to be hoisted, the air at the bottom of the lifting assembly is sucked away through three pneumatic components evenly distributed around the circumference, and the blades are firmly fixed to the bottom of the eighteen lifting components using external atmospheric pressure, thus realizing the process of lifting, installing and transporting the blades. When the lifting process is over, the pneumatic components are also unlocked with the help of three pneumatic components evenly distributed around the circumference to re-exhaust the air at the bottom of the lifting assembly. The internal and external atmospheric pressures are balanced, and the blades and lifting assembly are automatically separated. The entire lifting device switches from the lifting state to the disassembly state, and can achieve automatic separation from the blades. The entire process can be operated remotely, avoiding human-induced risks to the blades and greatly improving adaptability. By adjusting the position and size of the lifting components, the processes of lifting, lowering, transporting, and lifting blades of different sizes can be realized, greatly improving the economy of the devices required for the above working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG1 is a front view schematic diagram of the overall structure of the present invention in an assembled mode;

[0016] FIG2 is a side view schematic diagram of the overall structure of the present invention in an assembled mode;

[0017] FIG3 is a bottom view schematic diagram of the overall structure of the present invention in an assembled mode;

[0018] FIG4 is a bottom view of the structure of the present invention in an integrated structure assembly mode with the blades and the main frame removed;

[0019] FIG5 is a schematic structural diagram of the main frame of the present invention;

[0020] FIG6 is a schematic structural diagram of the lever assembly of the present invention;

[0021] FIG7 is a side structural schematic diagram of the lever assembly of the present invention;

[0022] FIG8 is a schematic structural diagram of the set plate assembly of the present invention;

[0023] FIG9 is a schematic structural diagram of the lifting assembly of the present invention;

[0024] FIG10 is a schematic structural diagram of the pneumatic assembly of the present invention;

[0025] FIG11 is a schematic side view of the structure of the pneumatic assembly of the present invention;

[0026] Among them, the reference numerals in the figures are:

[0027] 1. Main frame; 2. Lever assembly; 3. Triangle plate assembly; 4. Lifting assembly; 5. Pneumatic assembly; 6. Blade; 1.1. Outer frame; 1.2. Cylinder; 1.3. Lifting ring; 1.4. Inner frame; 1.1.1. Outer square steel; 1.4.1. Short square steel; 1.4.2. Rectangular steel; 2.1. Connecting plate; 2.2. Side mounting plate; 2.3. Center shaft; 2.4. Lever square steel; 2.5. Spacer; 2.6. Bearing; 2.7. Lock nut; 2.8. Connecting ball rod; 3.1. Large square steel; 3.2. Inner disc; 3.3. Oblique short square steel; 3.4. Oblique rectangular steel; 4.1. Ball screw; 4.2. Ring; 4.3. Lock nut; 4.4. PTFE pad; 5.1. Air compressor; 5.2. Ventilation pipe. DETAILED DESCRIPTION

[0028] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be described in further detail below with reference to the accompanying drawings.

[0029] Combine Figure 1 、 Figure 2 and Figure 3As shown, an embodiment of the present invention provides a large-scale wind turbine blade pneumatic lifting device, comprising a main frame 1, a lever assembly 2, a triangular plate assembly 3, a lifting assembly 4 and a pneumatic assembly 5. The main frame (1) is an equilateral triangle structure. A lever assembly 2 is installed under each corner of the main frame 1. Triangular plate assemblies 3 are installed under both ends of the lever assembly 2. The triangular plate assembly 3 is an equilateral triangle structure. A lifting assembly 4 is installed under each corner of the triangular plate assembly 3. The lifting assembly 4 has a circular ring. The lever assembly 2 is provided with a pneumatic assembly 5. The pneumatic assembly 5 provides negative pressure for the circular ring to load or disassemble the blade.

[0030] With proper connection and coordination, the entire lifting device can perform operations such as lifting, lowering, and installing large blades (6). The present invention utilizes levers and the release of a triangular plate to attach multiple lifting assemblies to the blade surface. Air is extracted by a pneumatic assembly, creating a vacuum between the lifting assemblies and the blade. External atmospheric pressure firmly presses the blade against the lifting assemblies. The atmospheric pressure evenly distributes the blade's gravity load across the multiple axially and rotationally symmetrical lifting assemblies, enabling controlled movement of the blade. To separate the blade from the lifting assemblies, reverse inflation is performed, and the pneumatic assembly breaks the vacuum between the lifting assemblies and the blade, effectively separating the blade from the lifting assemblies. This functional switching is implemented to enable automated installation and removal of the blade during remote operation. In many applications, after the blade lifting device is installed and commissioned, it is craned to the desired position (i.e., directly above the blade, ensuring that the blade's center of mass and the center of the blade lifting device are coplanar). The blade lifting device then descends from its initial position until the bottom lifting assembly is in contact with the blade surface.

[0031] In order to adapt to the air flow characteristics, the shape of the wind turbine blades must be a composite of the shape of the aerodynamic airfoil, usually a complex curved surface. Therefore, in order to ensure that multiple sets of lifting assemblies 4 can fit the surface of the blade 6, it is necessary to reasonably release the freedom of the lifting assembly connection assembly. The implementation process is as follows: the connection between the lever assembly 2 and the triangular plate assembly 3 releases its rotational freedom. The present invention uses the mutual cooperation between the connecting ball head rod 2.8 and the ball socket to limit its translational freedom while releasing its rotational freedom; at the same time, the triangular plate assembly and the lifting assembly also follow the same restriction of their translational freedom while releasing their rotational freedom. With the help of the above design, it can be ensured that the eighteen lifting assemblies are evenly fitted on the surface of the blade. With the help of air pressure, fully automatic installation and locking are achieved to provide support for subsequent transportation, lifting, and lifting; conversely, fully automatic disassembly can also be achieved. Therefore, the fully automatic installation and disassembly process greatly simplifies the working scene and has very wide application value. At the same time, the device has a wide range of applications. By adjusting the size of the leaf lever assembly and the triangular plate assembly, the device can realize the lifting process of leaves of various shapes, sizes and weights, and has a wide range of applications.

[0032] Combine Figure 4 The structure of the lifting device described in the embodiment of the present invention is arranged as follows: the main frame 1 is located at the highest point of the entire lifting device and is responsible for assembling and connecting with components such as the crane and lifting belt. The main frame 1 is the skeleton of the entire lifting device and is responsible for providing rigid support and connection fixation between the entire device. The lever assembly 2 is located at the bottom of the main frame. To meet the symmetrical distribution characteristics, the main frame 1 is designed as an equilateral triangle. Therefore, the centers of the three lever assemblies 2 are exactly located at the vertices of the equilateral triangle, responsible for evenly distributing the load at the bottom to the main frame at the top. The lever assembly 2 acts like a seesaw and automatically adjusts when the weight at both ends is unbalanced. There are six triangular plate assemblies 3, also in the shape of equilateral triangles. To evenly distribute the load, the centers of the triangles are designed at both ends of the lever assembly 2. Therefore, one lever assembly and two triangular plate assemblies 3 together form a large support point. The entire lifting assembly has three such large support points, ensuring that the weight of the blade is evenly transmitted to the main frame at the top through the eighteen lifting assemblies. To ensure uniform load distribution, the eighteen lifting components are arranged in the following pattern: six lifting components are evenly distributed around the smaller inner ring, and twelve lifting components are evenly distributed around the larger outer ring, with the inner and outer rings forming concentric circles. The inner ring bears one-third of the blade's weight, while the outer ring bears two-thirds. This arrangement helps evenly distribute the blade load and prevents damage caused by stress concentration.

[0033] Combine Figure 5, is a schematic structural diagram of the main frame 1 of the present invention. The main frame 1 includes an outer frame 1.1, a cylinder 1.2, a lifting ring 1.3, and an inner frame 1.4. The inner frame 1.4 is fixedly connected to the side of the outer frame 1.1. The cylinder 1.2 is set at the center of the outer frame 1.1 and fixedly connected to the side of the internal frame 1.4. The lifting ring 1.3 is installed on the upper part of the cylinder 1.2. The outer frame 1.1 includes three groups of external square steels forming an equilateral triangle. The cylinder 1.2 and the lifting ring 1.3 are set at the center of the equilateral triangle. The internal frame 1.4 includes three short square steels 1.4.1 and three long square steels 1.4.2. The short square steel 1.4.1 is fixed at the midpoint between the side of the cylinder 1.2 and the side of the external square steel 1.1.1, and the long square steel 1.4.2 is fixed at the side of the cylinder and the vertex of the side of the external square steel. The main frame is symmetrical and is assembled and connected to the crane and lifting straps via lifting rings on the upper side, ensuring balanced force and preventing lateral tilting of the main frame, which could pose a safety hazard during the lifting process. The main frame is a frame-like structure with high rigidity and strength. As the foundation for the entire blade, it is constructed from large square steel welded together.

[0034] Combine Figure 6 and Figure 7As shown, there are three lever assemblies 2 and they are symmetrically distributed around the circumference. Each lever assembly 2 is installed at the vertex of the equilateral triangle of the main frame 1 and is parallel to the bottom line of the opposite triangle. The lever assembly 2 includes a connecting plate 2.1, a side mounting plate 2.2, a central axis 2.3, a lever square steel 2.4, a spacer 2.5, a bearing 2.6, a locking nut 2.7 and a connecting ball rod 2.8. The side mounting plate 2.2 is installed at the lower part of the connecting plate 2.1. There are two bearings, which are respectively arranged in the circular holes of the connecting plate and the side mounting plate. The central axis 2.3 is installed in the middle of the two bearings. There are two locking nuts, which are symmetrically distributed on the outside of the connecting plate and the side mounting plate for fixing the axial position of the central axis. The connecting ball rods 2.8 are symmetrically distributed on both sides of the lever square steel 2.4. The role of the lever assembly in the present invention is to release the degree of freedom and ensure that the triangular plate assemblies on both sides can evenly bear the weight of the blades. If a mass imbalance occurs, the lever assembly automatically adjusts, with the heavier end bending downward and the lighter end tilting upward. This self-balancing behavior, similar to a seesaw, helps evenly distribute the weight. The lever assembly's connecting plates are mounted at the bottom of the main frame, at the vertices of an equilateral triangle. This allows the three lever assemblies to evenly transfer the blade's weight to the main frame at the top. The lever assembly installation process is as follows: First, install one set of bearings in the inner holes of the connecting plate and another set of bearings in the inner holes of the side mounting plates. Next, install one end of the central shaft into the center of the bearings mounted in the inner holes of the connecting plate. Next, install the lever square and spacer rings. Then, install the bearings in the side mounting plates onto the other end of the central shaft. The bottom of the side mounting plates is mounted on the surface of the connecting plate. Next, secure the locknuts at the other end of the central shaft. Finally, install the connecting ball rods at both ends. The bearings on both sides allow the lever square to rotate freely along the central axis, freeing up rotational freedom and ensuring even distribution of load.

[0035] Combine Figure 8As shown, there are six triangle plate assemblies 3 symmetrically distributed along the central circumference of the main frame, and every two triangle plate assemblies are installed symmetrically on both sides of a group of lever assemblies 2. Each triangle plate assembly 3 is composed of three large square steels 3.1, an internal disc 3.2, three groups of oblique rectangular steels 3.4 and three groups of oblique short square steels 3.3. Among them, the three groups of large square steels form an equilateral triangle, the internal disc 3.2 is set in the center of the equilateral triangle, and the oblique rectangular steels 3.4 and the oblique short square steels 3.3 are installed between the large square steels and the internal disc to enhance the rigidity. There are threaded holes on the triangle plate assembly for fixed connection with the connecting ball head rod in the lever assembly. The triangle plate assembly is designed as an equilateral triangle, and the threaded hole fixed to the connecting ball head rod is designed exactly in the center of the equilateral triangle to achieve uniform unloading of weight. There are six groups of triangle plate assemblies in total, which jointly bear the weight of the blades. Compared with the main frame, smaller square steels can be selected for welding. The triangle plate assembly can be leveled before being installed on the lever assembly. By appropriately adding mass blocks, its center of gravity can be ensured to be located exactly at the connecting thread. This design helps reduce weight unevenness caused by installation and processing errors and avoid safety hazards during practical use.

[0036] Combine Figure 9 As shown, there are eighteen lifting assemblies 4, six of which are distributed in the inner circle and twelve in the outer circle, all of which are symmetrically distributed along the central circumference of the main frame, and every three lifting assemblies are installed at the bottom of a triangular plate assembly. The lifting assembly includes a ball screw 4.1, a ring 4.2, a locking nut 4.3 and a polytetrafluoroethylene pad 4.4. The ball screw is connected to the upper part of the ring through a thread and is locked by the locking nut. The polytetrafluoroethylene pad is installed at the bottom of the ring. The ball screw is installed in the ball socket of the triangular plate assembly in order to achieve complete constraint of the translational degree of freedom and release of the rotational degree of freedom. The polytetrafluoroethylene pad is in direct contact with the blade, dispersing the bearing force while also isolating the gas flow. When the pneumatic assembly is working, a vacuum is formed between the bottom of the lifting assembly and the blade. Under the action of the external atmospheric pressure, the blade will be firmly attached to the bottom of the lifting assembly, and subsequent lifting operations can be carried out smoothly.

[0037] Combine Figure 10 and Figure 11As shown, there are three pneumatic assemblies, evenly distributed around the exterior of the main frame 1. The pneumatic assemblies 5 include an air compressor 5.1 mounted on top of the lever assembly 2, a vent pipe 5.2 mounted inside the lever assembly 2, a vent pipe 5.2 mounted inside the triangular plate assembly 3, and a vent pipe 5.2 mounted inside the lifting assembly. The pneumatic assemblies 5 are used to control blade lifting. When the blade is to be lifted, the air compressor in the pneumatic assembly sucks away the air at the bottom of the lifting assembly through the vent pipe 5.2 installed inside the lever assembly, the vent pipe 5.2 installed inside the triangular plate assembly and the vent pipe 5.2 installed inside the lifting assembly, and uses the external atmospheric pressure to firmly fix the blade at the bottom of the lifting assembly; conversely, when the blade is to be removed, the air compressor in the pneumatic assembly re-discharges the air at the bottom of the lifting assembly through the vent pipe 5.2 installed inside the lever assembly, the vent pipe 5.2 installed inside the triangular plate assembly and the vent pipe 5.2 installed inside the lifting assembly, thereby separating the blade and the blade pneumatic lifting device.

[0038] The installation, lifting, and removal process for the entire pneumatic lifting device for large wind turbine blades, which can be assembled automatically, is as follows: First, the lifting device is lifted to the top of the blade using a crane or other mechanical device. While adjusting the lifting device's position laterally, it is lowered until the PTFE cushion gradually approaches the blade surface. Fine-tuning is performed laterally to ensure that the blade's center of gravity and the center of the lifting device are aligned in the same vertical plane. The lifting device is then slowly lowered, ensuring that all legs of the lifting device are in close contact with the blade surface. The lowering of the crane is then stopped. The relative position of the lifting device and the blade is carefully observed to ensure that there is no collision or interference with the blade that could endanger the blade's safety. The three pneumatic assemblies begin to simultaneously draw air, removing air from the bottom leg through vent pipes located within the lever assembly, the triangular plate assembly, and the lifting assembly. At this point, the PTFE cushion is firmly attached to the blade's outer surface, and the external atmospheric pressure compresses the blade against the lifting device. Each pneumatic assembly drives six lifting assemblies. The three pneumatic assemblies achieve three-point support, fully bearing the weight of the blade, and the lifting device completes the lifting preparation. Subsequent lifting and transportation operations can be carried out. The disassembly process is the reverse process of the above process. When the blade is firmly stopped in the ideal position (for example, when installed on the wind turbine hub), the blade and the lifting device can be separated. The pneumatic assembly is inflated in reverse, and the three pneumatic assemblies begin to inflate synchronously. The air in the bottom leg is re-expelled through the vent pipes set inside the lever assembly, the triangle plate assembly, and the lifting assembly. The internal and external atmospheric pressures are balanced, and the blade is separated from the polytetrafluoroethylene cushion, realizing the switch from the lifting state to the disassembly state. Use a crane to move the blade lifting device away from the blade, and the process is completed.

[0039] The above disclosure is only a preferred embodiment of the present invention and certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A large wind turbine blade pneumatic lifting device, characterized in that: The invention comprises a main frame (1), a lever assembly (2), a triangular plate assembly (3), a lifting assembly (4) and a pneumatic assembly (5), wherein the main frame (1) is in an equilateral triangle structure, the lever assembly (2) is installed under each corner of the main frame (1), the triangular plate assembly (3) is installed under both ends of the lever assembly (2), the triangular plate assembly (3) is in an equilateral triangle structure, the lifting assembly (4) is installed under each corner of the triangular plate assembly (3), the lifting assembly (4) has a circular ring, the lever assembly (2) is provided with a pneumatic assembly (5), and the pneumatic assembly (5) provides negative pressure for the circular ring; there are three lever assemblies (2), which are symmetrically distributed under each corner of the peripheral frame (1.1) and parallel to the bottom side of the equilateral triangle structure; eighteen circumferentially evenly distributed lifting assemblies are used to evenly carry the gravity load of large blades, and the eighteen lifting assemblies are arranged in two circles, with six groups evenly distributed on the inner circle and twelve groups evenly distributed on the outer circle.

2. The large wind turbine blade pneumatic hoisting device according to claim 1, characterized in that: The main frame (1) comprises an outer frame (1.1), a cylinder (1.2), a lifting ring (1.3) and an inner frame (1.4); the inner frame (1.4) is located inside the outer frame (1.1) and is fixedly connected to the inner side surface thereof; the cylinder (1.2) is arranged at the center of the outer frame (1.1) and is fixedly connected to the inner frame (1.4); and the lifting ring (1.3) is installed on the upper part of the cylinder (1.2).

3. The large wind turbine blade pneumatic hoisting device according to claim 2, characterized in that: The outer frame (1.1) comprises three outer square steels (1.1.1) forming an equilateral triangle, the cylinder (1.2) is arranged at the center of the equilateral triangle, and the inner frame (1.4) comprises three short square steels (1.4.1) and three long square steels (1.4.2), wherein the short square steels (1.4.1) are fixed at the midpoints of the sides of the cylinder (1.2) and the sides of the outer square steels (1.1.1), and the long square steels (1.4.2) are fixed at the vertices of the sides of the cylinder (1.2) and the sides of the outer square steels (1.1.1).

4. The large wind turbine blade pneumatic hoisting device according to claim 1, characterized in that: The lever assembly (2) comprises a connecting plate (2.1), a side mounting plate (2.2), a central shaft (2.3), a lever square steel (2.4), a spacer (2.5), a bearing (2.6), a locking nut (2.7) and a connecting ball rod (2.8), wherein the side mounting plate (2.2) is mounted on the lower part of the connecting plate (2.1), two bearings (2.6) are respectively arranged in the circular holes of the connecting plate (2.1) and the side mounting plate (2.2), the central shaft (2.3) is mounted in the middle of the two groups of bearings (2.6), two locking nuts (2.7) are symmetrically distributed on the outside of the connecting plate (2.1) and the side mounting plate (2.2) and are used to fix the axial position of the central shaft (2.3), the connecting ball rod (2.8) is symmetrically distributed on both sides of the lever square steel (2.4), and the connecting plate (2.1) is used to be connected to the corner of the peripheral frame (1.1).

5. The large wind turbine blade pneumatic hoisting device according to claim 1, characterized in that: The triangular plate assembly (3) comprises a large square steel (3.1), an inner circular disc (3.2), three oblique rectangular steels (3.4) and three oblique short square steels (3.3), wherein the large square steel (3.1) forms an equilateral triangle, the inner circular disc (3.2) is arranged at the center of the equilateral triangle, the oblique rectangular steel (3.4) and the oblique short square steel (3.3) are installed between the large square steel (3.1) and the inner circular disc (3.2), and the inner circular disc (3.2) is connected to both ends of the lever assembly (2).

6. The large wind turbine blade pneumatic hoisting device according to claim 1, characterized in that: The lifting assembly (4) comprises a ball screw (4.1), the circular ring (4.2), a locking nut (4.3) and a polytetrafluoroethylene pad (4.4), wherein the ball screw (4.1) is connected to the upper part of the circular ring (4.2) through a thread and is locked by the locking nut (4.3), the polytetrafluoroethylene pad (4.4) is installed at the lower part of the circular ring (4.2), and the upper part of the ball screw (4.1) is connected to the corner of the triangular plate assembly (3).

7. The large wind turbine blade pneumatic hoisting device according to claim 6, characterized in that: The pneumatic assembly (5) comprises an air compressor (5.1) mounted on the upper portion of the lever assembly (2) and a vent pipe arranged inside the lever assembly (2), the triangular plate assembly (3) and the lifting assembly (4), wherein the vent pipe connects the circular ring with the air compressor (5.1).

8. The large wind turbine blade pneumatic hoisting device according to claim 7, characterized in that: When the pneumatic assembly (5) is hoisting the blade, the air compressor (5.1) in the pneumatic assembly (5) sucks away the air at the bottom of the lifting assembly (4) through the vent pipe, and firmly fixes the blade to the bottom of the lifting assembly (4) by utilizing the effect of external atmospheric pressure; conversely, when the blade is dismantled, the air compressor (5.1) in the pneumatic assembly (5) re-discharges the air at the bottom of the lifting assembly (4) through the vent pipe, thereby separating the blade and the blade pneumatic lifting device.

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