A large wind turbine blade lifting device capable of automatic assembly

Abstract

An embodiment of the present invention discloses a large wind turbine blade lifting device that can be automatically assembled, including a main frame, a motor transmission assembly, a blade lifting assembly, and a guide assembly. The guide assembly is fixedly installed in the main frame, and the blade lifting assembly is slidably installed on the guide assembly. The guide assembly provides positioning guidance for the horizontal movement of the blade lifting assembly. The motor transmission assembly is installed inside the main frame and is transmission-connected to the blade lifting assembly, so that the blade lifting assembly slides along the guide assembly to provide power for horizontal movement. The present invention provides multi-point support for the blades and ensures the safety and reliability of the lifting process. The present invention can realize the safe lifting and transportation process of large blades, and can automatically disassemble after the transportation and lifting process is completed without the need for close-range operation by staff, thereby realizing the lifting, lifting and transportation process of larger-sized blades and meeting many operating conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of hoisting equipment, and in particular to a large wind turbine blade hoisting device that can be automatically assembled and disassembled. Background Art

[0002] Among new and renewable energy sources, wind power, as a pure green energy source, is experiencing rapid development, crucial for my country's early achievement of carbon peak and carbon neutrality. The blades are the most significant factor restricting the expansion of wind turbine capacity and the development of large-scale turbine technology. Wind turbine blades 100 meters and longer are a key breakthrough target for future wind power technology innovation. Ensuring the efficient and reliable operation of ultra-long, flexible blades is the most critical technical challenge facing my country's wind power industry and a crucial pillar for my country's pursuit of global new energy technology. The enormous size of wind turbine blades makes lifting, hoisting, installation, transportation, and disassembly challenging. Blades are inherently expensive and heavy, making any damage to the blades themselves, as well as the potential loss of life from tipping or tilting during operation, unacceptable. Stress concentration can occur during lifting and handling, leading to localized damage that can then expand and cause significant economic losses. Therefore, in order to safely and effectively realize the fully automatic lifting process of large wind turbine blades and minimize the risks brought by human operation, it is necessary to study a large wind turbine blade lifting device that can realize fully automatic assembly, which is of great value.

[0003] Existing large wind turbine blade lifting devices have the following characteristics: Due to their enormous size, they are typically inserted into the outer circumference of the blade base. Using a framework, the blade is lifted by pulling up the scattered lifting devices along the outer circumference. During the lifting process, the lifting devices distributed along the outer circumference are overconstrained by multiple support points. It's unclear which support points are actually working, while others are not. Excessive localized stress can cause damage to the blade base. Due to their large size and weight, existing blade lifting devices typically require manual operation, posing significant safety risks to both the operator and the blade's reliability. A blade tipping over is life-threatening. After the blade is installed on the hub at high altitude, the lifted blade becomes trapped in the assembly and disassembly process. Human access to the lifting device is restricted, requiring remote control. If the lifting device cannot be removed, or if stress concentration occurs at certain locations, preventing the lifting device from separating from the large blade, this 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 large wind turbine blade lifting device that can be automatically assembled. This device allows for the safe lifting and transport of large blades, and can be automatically disassembled after the lifting and transport process is completed without the need for 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 lifting device that can be automatically assembled, comprising a main frame (1), a motor transmission assembly (2), a blade lifting assembly (3) and a guide assembly (4), wherein the guide assembly is fixedly installed in the main frame, the blade lifting assembly (3) is slidably installed on the guide assembly (4), and the guide assembly (4) provides positioning guidance for the horizontal movement of the blade lifting assembly (3). The motor transmission assembly (2) is installed inside the main frame (1) and is transmission-connected to the blade lifting assembly (3), so that the blade lifting assembly (3) slides along the guide assembly (4) to provide power for horizontal movement.

[0006] Furthermore, the guide assembly (4) comprises two sets of guide rail assemblies (4.1) of identical structure, the guide rail assembly (4.1) comprising two parallel guide rail bases (4.1.1) and four sets of guide rail sliders (4.1.2), the four sets of guide rail sliders (4.1.2) being slidably arranged on the guide rail bases (4.1.1), and the two sets of guide rail sliders (4.1.2) located on the same side are connected to the corresponding blade lifting assembly (3).

[0007] Furthermore, the two guide rail sliders form a group.

[0008] Furthermore, the blade lifting assembly (3) includes two groups of symmetrically distributed blade lifting legs (3.1), and the blade lifting legs (3.1) include a horizontal square plate (3.1.1), a vertical square steel (3.1.2), a mounting plate (3.1.3) and a cushion (3.1.4); the vertical square steel (3.1.2) is mounted on the lower part of the horizontal square plate (3.1.1), the mounting plate (3.1.3) is mounted on the side of the vertical square steel (3.1.2), the cushion (3.1.4) is mounted on the contact surface of the side of the mounting plate (3.1.3), and the horizontal square plate (3.1.1) is fixedly connected to the two groups of guide rail sliders (4.1.2).

[0009] Furthermore, the motor transmission assembly (2) is composed of two groups of blade lifting legs that respectively drive the guide rail assembly. The motor transmission assembly (2) includes a motor (2.1), a rotating shaft (2.2), a synchronous belt (2.3), a heavy-duty ball screw (2.4), two groups of nuts (2.5) with opposite rotation directions, a bearing (2.6) and a bearing mounting seat (2.7); the motor (2.1) is connected to the rotating shaft (2.2) through a coupling, and the rotating shaft (2.2) is connected to the synchronous belt (2.3). .3) is connected to the driving wheel (2.3.1), and the driven wheel (2.3.2) connected to the synchronous belt (2.3) is fixedly connected to the heavy-duty ball screw (2.4); the heavy-duty ball screw (2.4) is symmetrically installed with two sets of nuts (2.5) with opposite rotation directions; the heavy-duty ball screw (2.4) is symmetrically installed with the bearings (2.6) on the left and right, and the bearings (2.6) are installed inside the bearing mounting seat (2.7), and the bearing mounting seat (2.7) is fixedly set under the main frame (1).

[0010] Furthermore, the horizontal square plate is fixedly connected to the nut (2.5).

[0011] Furthermore, the main frame (1) includes a horizontal frame (1.1), a vertical frame (1.2), and a lifting ring (1.3); the horizontal frame (1.1) includes four groups of external square steels (1.1.1) constituting a square frame, three groups of internal square steels (1.1.2) arranged in the square frame, and four groups of diagonal square steels (1.1.3); the three groups of internal square steels are fixed in parallel between opposite sides of the square frame, and the four groups of diagonal square steels (1.1.3) are obliquely connected between the three groups of internal square steels and the square frame.

[0012] Furthermore, it also includes a hydraulic lifting component (5), the hydraulic lifting component (5) is installed on the side of the main frame (1), and the hydraulic lifting component (6) is locked and matched with the blade lifting component (3).

[0013] Furthermore, the hydraulic lifting assembly (5) includes a hydraulic support (5.1.1), the blade lifting leg (3.1) is provided with a central circular hole (3.1.5), and the hydraulic support (5.1.1) is lifted into the central circular hole (3.1.5) by the drive of the hydraulic cylinder to lock the movement of the blade lifting leg (3.1).

[0014] The implementation of the present invention has the following beneficial effects: The present invention utilizes four sets of symmetrically distributed polytetrafluoroethylene cushions to provide axial and radial support. During the blade lifting process, the blade is supported by multiple support points, resulting in evenly distributed support force and stable positioning. This prevents localized stress concentration that could damage the blade surface, as well as dangerous conditions such as slippage and tipping, thereby ensuring the safety and reliability of the lifting process. The coordinated positioning of the motor drive assembly, guide assembly, and hydraulic lift assembly allows for free adjustment and fixation of the blade lifting assembly. When the four sets of blade lifting assemblies move synchronously toward the blade and finally come to rest in a position that tightens the blade, the hydraulic lift assembly locks the position, allowing the blade to be lifted and transported. When the lifting process is complete, the hydraulic lift assembly is unlocked, and the four sets of blade lifting assemblies move synchronously in the opposite direction of the blade and finally come to rest away from the blade. The entire lifting device transitions from an assembled to a disassembled state, allowing for free removal from the blade tip. This entire process can be performed unmanned, eliminating risks associated with human intervention and significantly improving adaptability. By adjusting the position of the hydraulic lifting assembly, the processes of lifting, lowering, transporting and supporting blades of different sizes can be realized, which greatly improves 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 of the structure of the present invention in an integrated structure assembly mode with the blades and lifting legs removed;

[0018] FIG4 is a schematic structural diagram of the main frame of the present invention;

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

[0020] FIG6 is a schematic structural diagram of the vertical frame of the present invention;

[0021] FIG7 is a schematic structural diagram of the motor transmission assembly of the present invention;

[0022] FIG8 is a schematic diagram of the automatic installation of two sets of blade lifting legs synchronously moving toward the blade according to the present invention;

[0023] FIG9 is a schematic diagram of the automatic disassembly of two sets of blade lifting legs according to the present invention by synchronously moving away from the blade;

[0024] FIG10 is a schematic structural diagram of the blade lifting legs of the present invention;

[0025] FIG11 is a front view schematic structural diagram of the guide assembly of the present invention;

[0026] FIG12 is a schematic diagram of the top view of the guide assembly of the present invention;.

[0027] FIG13 is a schematic diagram of the position of the hydraulic lifting assembly of the present invention installed on the main frame;

[0028] FIG14 is a schematic structural diagram of the hydraulic lifting assembly of the present invention.

[0029] Among them, the reference numerals in the figures are:

[0030] 1. Main frame; 2. Motor drive assembly; 3. Blade lifting assembly; 4. Guide assembly; 5. Hydraulic lifting assembly; 6. Blades; 1.1. Horizontal frame; 1.2. Vertical frame; 1.3. Lifting ring; 1.1.1. External square steel; 1.1.2. Internal square steel; 1.1.3. Diagonal square steel; 1.2.1. Vertical square steel; 1.2.2. Oblique square steel; 1.2.3. Horizontal square steel; 2.1. Motor; 2.2. Rotating shaft; 2.3. Synchronous belt; 2.4. Heavy-duty roller Ball screw; 2.5. Nut; 2.6. Bearing; 2.7. Bearing mounting seat; 2.3.1. Driving pulley; 2.3.2. Driven pulley; 3.1. Blade lifting legs; 3.1.1. Horizontal square plate; 3.1.2. Vertical square steel; 3.1.3. Mounting plate; 3.1.4. Cushion; 3.1.5. Round hole; 4.1. Guide rail assembly; 4.1.1. Guide rail base; 4.1.2. Guide rail slider; 5.1. Hydraulic strut; 5.2. Hydraulic cylinder; 5.3. Hydraulic mounting seat. DETAILED DESCRIPTION

[0031] 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.

[0032] Reference Figure 1 、 Figure 2 As shown, an embodiment of the present invention is an automatically assembled large-scale wind turbine blade lifting device, which includes a main frame 1, a motor transmission assembly 2, a blade lifting assembly 3, a guide assembly 4 and a hydraulic lifting assembly 5, wherein the main frame 1 provides installation support for all components, the motor transmission assembly 2 is used to link the blade lifting assembly 3 to move along the guide assembly 4 to load or remove blades between the blade lifting assemblies 3, and the hydraulic lifting assembly 5 is used to lock the position of the blade lifting assembly 3 on the guide assembly 4.

[0033] The entire blade lifting device can realize the lifting, lowering, removal, installation and other operations of large-sized blades 6 through correct connection and coordination. Figure 8 The lifting status shown switches to Figure 9 The blade lifting device is shown in the disassembled state. This functional switching is implemented to meet the requirement for automatic installation and removal of the blade lifting assembly during unmanned operation. In many application scenarios, the blade lifting device can be moved from the blade tip toward the blade root to the desired position. After the two sets of blade lifting legs 3.1 of the blade lifting assembly 3 are symmetrically distributed on both sides of the blade's center of mass, the blade lifting device can be fully automatically installed and locked, providing support for subsequent handling, lifting, and lifting. Conversely, the blade lifting device can be fully automatically disassembled and locked, and then removed from the blade in the opposite direction, away from the blade tip. Therefore, the fully automated installation and removal process greatly simplifies the work environment and has a wide range of applications. Furthermore, the device has a wide range of applications. By adjusting the position of the blade lifting assembly 3 and the hydraulic lifting assembly 5, it can lift blades of various shapes, sizes, and weights, making it suitable for a wide range of applications. The blade's center of mass is located at the center of the bilaterally symmetrical blade lifting legs, ensuring safety during the blade lifting process, preventing tipping and damage to the blade, and ensuring safety during the blade lifting process.

[0034] The main frame 1 is located at the highest point of the entire lifting device and is responsible for assembly and connection with components such as the crane and lifting belts. The main frame is the skeleton of the entire lifting device and is responsible for achieving rigid support and connection fixation between the entire device. The motor transmission assembly 2 is located inside the main frame and is responsible for providing power to the blade lifting assembly 3 connected to the bottom of the main frame for state switching. In this embodiment, the blade lifting assembly 3 is preferably composed of four groups of blade lifting legs with exactly the same structure, two groups are located on the left side of the blade, and two groups are located on the right side of the blade, and are symmetrically distributed on the left and right sides. Ensure that the center lines of the two groups of blade lifting legs on the left pass through the center of gravity of the blade. Similarly, ensure that the center lines of the two groups of blade lifting legs on the right pass through the center of gravity of the blade. The blade lifting assembly is responsible for axial and radial fixation with the blade and provides lifting support force.

[0035] The guide assembly 4 is mounted on the underside of the main frame and consists of two identical guide rail assemblies 4.1. Each guide rail assembly 4.1 includes two guide rail bases 4.1.1 and four guide rail sliders 4.1.2. The left guide rail assembly 4.1 and the right guide rail assembly 4.1 cooperate with the blade lifting assembly 3 to clamp the blades.

[0036] The guide assembly 4 provides a guide for the horizontal movement of the blade lifting legs, and the four sets of sliders cooperate to achieve the smooth sliding of the blade lifting legs. The entire device performs its own functions, and the lifting and installation operations of the blades are achieved through the coordination of the structures.

[0037] Combine Figure 3The figure shows the spatial distribution relationship of the main frame, motor transmission assembly and guide assembly when the blades and lifting legs are removed and viewed from above in the overall structural assembly mode. The motor transmission assembly 2 is located at the lower part of the main frame, wherein the motor is installed at the lower part of the inner square steel, and the heavy-duty ball screw, large nut and bearing mounting seat are installed at the lower part of the outer square steel. Two sets of guide rail assemblies are installed at the lower part of the outer square steel, and are symmetrically distributed on both sides of the heavy-duty ball screw 2.4. The heavy-duty ball screw cooperates with the large nut 2.5 to provide motion power, and the four sets of guide rail sliders provide guidance. Together, they can achieve smooth sliding of the blade lifting legs and realize automatic installation and automatic disassembly processes.

[0038] Combine Figure 4 、 Figure 5 and Figure 6 As shown, the main frame 1 includes a horizontal frame 1.1, four sets of vertical frames 1.2 that are axially symmetrically distributed and fixed on the outside of the horizontal frame, and four sets of lifting rings 1.3 installed on the upper part of the horizontal frame. The four sets of lifting rings 1.3 are located on the upper side of the lifting device to achieve assembly and connection with components such as the crane and lifting belts, ensuring balanced force and preventing the main frame from tilting laterally to pose a safety hazard during the lifting process. The horizontal frame 1.1 includes external square steel 1.1.1 that constitutes a square frame, three sets of internal square steel 1.1.2 that are parallel to the inside of the square frame, and four sets of diagonal square steel 1.1.3. The vertical frame 1.2 includes vertical square steel 1.2.1, oblique square steel 1.2.2, and horizontal square steel 1.2.3 that form a triangular structure.

[0039] All main frame materials are square steel. Among them, the horizontal frame is responsible for connecting the motor transmission assembly and the guide assembly, and the vertical frame is responsible for connecting the hydraulic lifting assembly. The external square steel bears the gravity load, so larger square steel is selected; the internal square steel and diagonal square steel constitute the frame structure and do not bear the gravity of the blades, so smaller square steel is selected. One set of vertical frames is installed with two sets of hydraulic lifting assemblies to provide position locking for the blade lifting legs. One set is used for position locking during the lifting process, and the other set is used for position locking during the disassembly process. The oblique square steel is used to connect and reinforce the vertical and horizontal square steels to prevent the blade lifting legs from shifting during the lifting and disassembly processes.

[0040] Combine Figure 7 、 Figure 8 and Figure 9As shown, the motor transmission assembly 2 consists of a motor 2.1, a rotating shaft 2.2, a synchronous belt 2.3, a heavy-duty ball screw 24, two nuts 2.5 with opposite rotation directions, two bearings 2.6, and a bearing mounting seat 2.7. The power transmission process is as follows: the motor 2.1 drives the rotating shaft 2.2 to rotate through the coupling, the rotating shaft drives the driving wheel to rotate, the driving wheel drives the synchronous belt to rotate, and the synchronous belt drives the driven wheel to rotate, and finally the power is transmitted to the heavy-duty ball screw. During the rotation of the ball screw, the large nut is connected to the blade lifting leg. Since the blade lifting leg is also connected to the guide assembly, its rotational freedom is constrained, causing the large nut to translate along the ball screw, converting the rotational power of the motor into the translational force of the large nut. Two sets of large nuts are symmetrically distributed on a set of ball screws, and the two sets of large nuts have opposite rotation directions, ensuring that during the rotation of the ball screw, the two sets of large nuts are simultaneously away from the center of the ball screw or simultaneously approach the center of the ball screw. The process of moving away from the center of the ball screw is the disassembly process of the blade lifting device, and the process of approaching the center of the ball screw is the installation process of the blade lifting device.

[0041] Combine Figure 10 As shown, the blade lifting assembly 3 includes two groups of symmetrically distributed blade lifting legs 3.1, with each two blade lifting legs 3.1 forming a group. The blade lifting legs 3.1 include a horizontal square plate 3.1.1, a vertical square steel 3.1.3 installed at the bottom of the horizontal square plate, a mounting plate 3.1.3 installed at the side of the vertical square steel, and a polytetrafluoroethylene pad 3.1.4 installed at the side of the mounting plate. The polytetrafluoroethylene pad is in direct contact with the surface of the blade to prevent possible scratches and scrapes on the blade surface caused by stress concentration. A circular hole is opened on the side of the vertical square steel to cooperate with the locking and unlocking functions of the hydraulic lifting assembly. When the blade lifting legs enter the working state during the process of switching from the disassembly state to the working state, the inner hydraulic support can be lifted into the center circular hole to lock the translation of the legs. When the lifting is completed, the hydraulic support can be reversed out of the center circular hole, re-unlocking the translation of the support legs, and the blade lifting legs move away from the blades. After finally reaching the docking position, the outer hydraulic support can be lifted into the center circular hole to realize the locking process of the disassembly state, preventing the blade lifting legs from shaking during the disassembly process, which may cause safety hazards.

[0042] Combine Figure 11 and Figure 12As shown, the guide assembly 4 is composed of two groups of guide rail assemblies 4.1 with exactly the same structure, which are respectively referred to as the left guide rail assembly and the right guide rail assembly. Each group of guide rail assemblies is composed of two guide rail bases 4.1.1 and four groups of guide rail sliders 4.1.2. The two guide rail bases 4.1.1 are respectively referred to as the left guide rail base and the guide rail base. The guide rail bases 4.1.1 are installed at the bottom of the main frame. The two guide rail sliders in the left guide rail base and the two guide rail sliders in the right guide rail base are connected to the horizontal square plate together, providing guidance for the horizontal movement of the blade lifting legs on one side; similarly, the other two groups of guide rail sliders in the left guide rail base and the other two groups of guide rail sliders in the right guide rail base are connected to the horizontal square plate together, providing guidance for the horizontal movement of the blade lifting legs on the other side. The guide rail assembly bears the gravity load of the wind turbine blades.

[0043] Combine Figure 13 and Figure 14 As shown, the hydraulic lifting assembly 5 comprises hydraulic struts 5.1, hydraulic cylinders 5.2, and hydraulic mounting brackets 5.3. There are eight sets of hydraulic lifting assemblies 5, which are used to lock the movement of the blade lifting legs. Four of these sets of hydraulic lifting assemblies are used to lock the four sets of blade lifting legs during lifting, and the remaining four sets of hydraulic lifting assemblies are used to lock the four sets of blade lifting legs during removal. Driven by the hydraulic cylinders, the hydraulic struts are lifted into the circular holes 3.1.5, locking the blade lifting legs.

[0044] The installation, lifting, and disassembly process for the entire automatically assembled large-scale wind turbine blade lifting device and blades is as follows: First, use a crane or other mechanical device to lift the entire lifting device to the outside of the blade tip, ensuring that the blade lifting assembly is in a disassembled state, that is, the blade lifting legs are away from the blade and the PTFE pad is away from the blade surface. The height and radial position are adjusted to ensure that the blade is centered between the two sets of blade lifting legs. Then, the blade lifting device is slowly and steadily translated from the outside of the blade tip along the blade axis until the centers of the left and right blade lifting legs and the blade's center of gravity are in the same vertical plane. Observe and measure the height to ensure that the blade lifting assembly does not collide or interfere with the blade during state switching, which could endanger the blade's safety. The lifting machinery stops and switches from the disassembly state to the lifting state. That is, the motor starts working and transmits power to the blade lifting assembly through the motor transmission assembly. Under the position control of the guide assembly, the four sets of blade lifting legs move axially symmetrically in pairs toward the blade direction. After reaching the preset position, the motor automatically stops. At this time, the polytetrafluoroethylene cushion is tightly attached to the outer surface of the blade, and the four sets of blade lifting legs provide radial force for the blade. The hydraulic lifting switch automatically opens, and the hydraulic support enters the center circular hole to lock the blade lifting legs, realizing the state switching. The disassembly process of the blade lifting device is the reverse process of the above process. First, the hydraulic lifting switch is switched, and the hydraulic support exits the center circular hole to unlock the lifting legs, realizing the switching from the lifting state to the disassembly state. Then the motor works in reverse, and transmits power to the blade lifting assembly through the motor transmission assembly. The four sets of blade lifting legs move axially symmetrically away from the blade. After reaching the preset position, the motor automatically stops, the hydraulic lifting switch automatically opens, and the hydraulic support enters the circular hole to lock the blade lifting legs, completing the state switching. The blade lifting device moves away from the blade root toward the blade tip, and finally completely leaves the blade, and the process ends.

[0045] 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 lifting device that can be automatically assembled, characterized in that: The invention comprises a main frame (1), a motor transmission assembly (2), a blade hoisting assembly (3) and a guide assembly (4), wherein the guide assembly is fixedly mounted in the main frame, the blade hoisting assembly (3) is slidably mounted on the guide assembly (4), and the guide assembly (4) provides a positioning guide for the horizontal movement of the blade hoisting assembly (3); the motor transmission assembly (2) is mounted inside the main frame (1) and is in transmission connection with the blade hoisting assembly (3), so that the blade hoisting assembly (3) slides along the guide assembly (4) to provide power for horizontal movement; The guide assembly (4) comprises two sets of guide rail assemblies (4.1) with identical structures. The guide rail assembly (4.1) comprises two parallel guide rail bases (4.1.1) and four sets of guide rail sliders (4.1.2). The four sets of guide rail sliders (4.1.2) are slidably arranged on the guide rail bases ( 4.1.1), two sets of guide rail sliders (4.1.2) located on the same side are connected to the corresponding blade lifting assemblies (3); The blade lifting assembly (3) comprises two sets of symmetrically distributed blade lifting legs (3.1), and the blade lifting legs (3.1) comprise a horizontal square plate (3.1.1), a vertical square steel (3.1.2), a mounting plate (3.1.3) and a cushion (3.1.4); the vertical square steel (3.1.2) is mounted on the lower part of the horizontal square plate (3.1.1), the mounting plate (3.1.3) is mounted on the side of the vertical square steel (3.1.2), and the cushion (3.1.4) is mounted on the mounting plate ( 3.1.3) On the side contact surface, the horizontal square plate (3.1.1) is fixedly connected to the two sets of guide rail sliders (4.1.2); It also includes a hydraulic lifting assembly (5), the hydraulic lifting assembly (5) is installed on the side of the main frame (1), and the hydraulic lifting assembly (5) is locked and matched with the blade lifting assembly (3); The hydraulic lifting assembly (5) includes a hydraulic support (5.1.1), and the blade lifting leg (3.1) is provided with a central circular hole (3.1.5). The hydraulic support (5.1.1) is driven by a hydraulic cylinder to rise into the central circular hole (3.1.5) to lock the movement of the blade lifting leg (3.1).

2. The large wind turbine blade lifting device capable of automatic assembly according to claim 1, characterized in that: The two guide rail sliders form a group.

3. The large wind turbine blade lifting device capable of automatic assembly according to claim 1, characterized in that: The motor transmission assembly (2) is composed of two groups, which respectively drive the blade lifting legs on the guide rail assembly. The motor transmission assembly (2) comprises a motor (2.1), a rotating shaft (2.2), a synchronous belt (2.3), a heavy-duty ball screw (2.4), two groups of nuts (2.5) with opposite rotation directions, a bearing (2.6) and a bearing mounting seat (2.7); the motor (2.1) and the rotating shaft (2.2) are connected via a coupling, and the rotating shaft (2.2) and the synchronous belt (2.3) are connected to each other. The driving wheel (2.3.1) is connected to the driven wheel (2.3.2) connected to the synchronous belt (2.3) and is fixedly connected to the heavy-duty ball screw (2.4); the heavy-duty ball screw (2.4) is symmetrically mounted with two sets of nuts (2.5) with opposite rotation directions; the heavy-duty ball screw (2.4) is symmetrically mounted with the bearings (2.6), the bearings (2.6) are mounted inside the bearing mounting seat (2.7), and the bearing mounting seat (2.7) is fixedly arranged under the main frame (1).

4. The large wind turbine blade lifting device capable of automatic assembly according to claim 3 is characterized in that: The horizontal square plate is fixedly connected to the nut (2.5).

5. The large wind turbine blade lifting device capable of automatic assembly according to claim 1, characterized in that: The main frame (1) comprises a horizontal frame (1.1), a vertical frame (1.2), and a lifting ring (1.3); the horizontal frame (1.1) comprises four groups of external square steels ( 1.1.1), three groups of internal square steels (1.1.2) and four groups of diagonal square steels (1.1.3) are arranged in the square frame, the three groups of internal square steels are fixed parallel to the opposite sides of the square frame, and the four groups of diagonal square steels (1.1.3) are obliquely connected between the three groups of internal square steels and the square frame.

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