A multi-fan blade tandem hoist sling and method of use thereof

Abstract

The application provides a multi-fan blade series hoisting hoist and a use method thereof, and belongs to the technical field of hoisting equipment.The hoist comprises a main body frame, a blade clamping mechanism, a clamp, a control station and a magnetorheological damping limiting baffle.The blade clamping mechanism is located inside the main body frame, the C-shaped frame is fixedly connected with the main body frame, and the hydraulic cylinder is used for controlling the rising and falling of the clamping plate.The clamp is installed on the clamping plate and is used for controlling the clamping of the blade, and the hydraulic cylinder is used for controlling the rising and falling of the clamp.The magnetorheological damping limiting baffle is arranged on the two end extension frames of the main body frame and is used for horizontal positioning during the clamping of the blade.The control station is installed on the main body frame and is used for providing required energy and accurately controlling the clamping force.The hoist in the application has a large variable pitch range, can realize variable pitch during the hoisting of the blade, can meet the requirement of the installation angle of the blade, is convenient for the installation of the blade, the hoist can simultaneously load three fan blades for hoisting, the efficiency is improved, and the requirement of the construction period is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fan blade installation, in particular, especially relates to a multi-fan blade series lifting hoist and a using method thereof. BACKGROUND

[0002] With the gradual increase of human demand for clean energy, the wind power industry develops rapidly. The wind power generation facility is usually composed of blades, generator sets, tower drums and foundation towers. The tower drum is fixed on the foundation tower, the generator set is installed at the top of the tower drum, and the blade is connected with the hub through bolt cooperation.

[0003] When installing a group of wind power towers, the blade is usually the last to be installed and needs to be lifted by a crane and installed on the generator set. The installation position is high, the wind power generation blade is large and irregular in size, and the high-altitude strong wind interference affects the accuracy, which brings difficulties to the installation of the blade. Each position angle calibration can only be calibrated repeatedly by the crane, which is difficult and low in efficiency

[0004] In order to save space, offshore wind power ships usually adopt three-layer stacking transportation of blades. A group of wind power towers needs three groups of blades, and the existing single-blade hoist can only lift one group at a time, which needs to be lifted repeatedly by the crane, resulting in low installation efficiency. SUMMARY

[0005] According to the above technical problems, a multi-fan blade series lifting hoist and a using method thereof are provided. The blade clamping mechanism of the present application is located inside the main frame, the C-shaped frame is fixedly connected with the main frame, and the hydraulic cylinder is used to control the rising and falling of the clamping plate; the clamp is used to control the clamping of the blade, and the hydraulic cylinder is used to control the rising and falling of the clamp; the horizontal positioning of the blade clamping is realized by the magnetic rheological damping limiting baffle, and the required energy is provided by the control station and the clamping force is accurately controlled, so as to meet the requirements of the installation angle of the blade and facilitate the installation of the blade.

[0006] The technical means adopted by the present application are as follows:

[0007] A multi-fan blade series lifting hoist, comprising: a plurality of main frames, a plurality of blade clamping mechanisms installed in the main frame, a plurality of clamps, a magnetic rheological damping limiting baffle and a control station installed on the upper part of the main frame, the plurality of main frames are connected in sequence in the vertical direction, the upper part of the uppermost main frame is provided with a structure for connecting with a sling; the plurality of blade clamping mechanisms are symmetrically arranged inside the main frame at both ends, and have an opening and closing function; the clamp is installed on the blade clamping mechanism and used to clamp the blade under the drive of the blade clamping mechanism, and the two ends of the blade are placed on the support frame; the magnetic rheological damping limiting baffle is installed on the main frame and used to realize the horizontal positioning of the blade clamping; the control station is connected with the main frame, the blade clamping mechanism and the clamp, and used to provide the required energy and accurately control the clamping force.

[0008] Further, the main body frame comprises an outer frame, the inner side of the outer frame is provided with a plurality of cross beams, the vane clamping mechanism is connected with the cross beams, the outer frame is provided with an extension frame, the extension frame is connected at both ends of the cross beam in the middle and close to the vane clamping mechanism located on the outer side, and each of the two side extension frames is provided with the magnetic rheological damping limiting baffle.

[0009] Further, the vane clamping mechanism comprises a C-shaped frame and two clamping plates, the C-shaped frame is fixedly connected with the cross beam of the main body frame, and the two clamping plates are respectively hingedly connected above and below the C-shaped frame, and each outer side of the clamping plates is connected with a group of hydraulic cylinders, the hydraulic cylinder group comprises two hydraulic cylinders arranged in a staggered manner, one end of each group of hydraulic cylinders is hingedly connected with the main body frame, and the other end is hingedly connected with the clamping plate, and the two hydraulic cylinders of each group are controlled to stretch and retract to control the clamping plate to rotate, so that the opening and closing actions of the two clamping plates are realized.

[0010] Further, the clamp comprises a mounting seat, a hydraulic cylinder, a supporting small arm, a movable chuck and a plurality of rubber plates, the mounting seat is fixed on the clamping plate of the vane clamping mechanism, the supporting small arm is hingedly connected with the mounting seat, one end of the hydraulic cylinder is hingedly connected with the clamping plate, and the other end is hingedly connected with the supporting small arm, the supporting small arm is driven to rotate around the X axis through the hydraulic cylinder, the movable chuck is hingedly connected with the supporting small arm and can rotate around the Z axis, the plurality of rubber plates are arrayed and hingedly connected on the side of the movable chuck facing the clamped vane, and the rubber plates rotate to adjust the angle according to the surface shape of the clamped vane; two clamps are arranged in series on each clamping plate.

[0011] Further, the control station is installed on the uppermost main body frame, and comprises a generator, an electric control box, a frequency conversion box and a hydraulic station, the generator and the frequency conversion box are connected with the electric control box, and the vane clamping mechanism and the clamp are clamped together with the hydraulic station.

[0012] Further, the magnetic rheological damping limiting baffle is arranged on the extension frame on both sides of the main body frame, and comprises two magnetic rheological dampers and a limiting baffle, two magnetic rheological dampers arranged in horizontal parallel are installed on each side of the extension frame, and the limiting baffle is connected at the ends of the two magnetic rheological dampers.

[0013] Further, a plurality of lifting points are arranged at the upper end of the outer frame of the uppermost main body frame, the lifting points are used for being connected with lifting ropes to realize lifting of the plurality of main body frames.

[0014] Further, two adjacent main body frames are connected through telescopic square tubes, the telescopic square tubes are arranged at the bottom corners of the outer frame located on the upper side, have the telescopic function, and can adjust the vertical distance between the two adjacent main body frames up and down according to the working condition.

[0015] The application further provides a method for using the multi-wind-turbine-blade series connection hoist hanger, comprising the following steps:

[0016] When the blades are installed, first, the crane is controlled to suspend the hanger to hoist the main frame close to the blades stacked on the blade transport ship, under the accurate control of the control station, the telescopic square tube adjusts the spacing between the multiple main frames according to the actual working condition, then the hanger gradually advances horizontally to the position where the blade contacts the magnetorheological damping limiting baffle, at this time, the multiple blades are wrapped by the corresponding multiple blade clamping mechanisms, then the upper and lower clamping plates are closed to approach the blades, the joints of the clamps are adaptively adjusted to make the rubber plates on the movable chucks tightly contact the blade surface, the blades are clamped, then the support frames at both ends of the blades are removed from both sides, and the multiple blades are hoisted for operation.

[0017] Further, the method comprises the following steps:

[0018] First, the lifting ropes are connected between the crane hooks and the four lifting points of the main frame, then the crane is controlled to move the hanger to one side of the multiple stacked blades, and the opening is directed to the side of the blades; the telescopic square tube is controlled to extend or retract under the control of the control station according to the actual spacing between the blades, so that the blades and the hanger are aligned; one of the hangers is taken as an example for description, and the operation procedures of the other hangers are the same; the crane controls the hanger to horizontally approach the blades until the blades contact the magnetorheological damping limiting baffle, and then stop, at this time, the blades are wrapped by the blade clamping mechanisms;

[0019] Then, under the control of the control station, the hydraulic cylinder groups control the clamping plates to close to the blades, the support arms are driven by the hydraulic cylinders, and the movable chucks and the rubber plates are adaptively adjusted in angle, so that the rubber plates on the movable chucks tightly contact the blade surface, and the blades are clamped by the multiple clamps; after checking and confirming that all the blades are clamped, the support frames at both ends of the blades are removed from both sides, and the clamps complete the clamping operation;

[0020] Then, the crane hoists the blades to the required position for installation; during installation, the telescopic square tube extends or retracts to adjust the distance between the clamps for installation; one of the hangers is taken as an example for description, and the operation procedures of the other hangers are the same; the control station controls the movable joints of the clamps to make the clamps clamp the blades to adjust the position angle in the Y-Z plane or rotate around the Z axis by a small amplitude, so as to adjust to the appropriate installation position and angle for installation; after installation, the crane controls the hanger to change the position, and continues to install the next group of blades; in this way, the installation of the wind turbine blades is realized.

[0021] Compared with the prior art, the application has the following advantages:

[0022] 1. The multi-fan blade series connection hoisting sling and its use method provided by the application can simultaneously clamp and hoist three groups of fan blades, reduces repeated hoisting time, and improves installation efficiency in the face of a blade transport ship that transports blades in a three-layer stacking mode.

[0023] 2. The multi-fan blade series connection hoisting sling and its use method provided by the application is provided with a control station, and the hydraulic system and the electric control system cooperatively and accurately control the position and angle of the clamping plate and the clamp according to the shape of the blade to clamp the blade. When the blade is installed to the hub in the air, the control station can control the clamp to adjust the position angle or rotate around the Z-axis with a small amplitude to adjust the installation position angle, thereby improving the installation precision.

[0024] 3. The multi-fan blade series connection hoisting sling and its use method provided by the application is provided with a control station, a magnetorheological damping limiting baffle, and a flexible rubber plate at the end of the clamp, so that the blade can be accurately clamped and the damage to the blade is reduced.

[0025] Based on the above reasons, the application can be widely promoted in the field of fan blade installation. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0027] Figure 1 It is a schematic diagram of the sling clamping three-layer stacked blades of the application.

[0028] Figure 2 It is a schematic diagram of the overall structure of the application.

[0029] Figure 3 It is a schematic diagram of the single sling structure of the application.

[0030] Figure 4 It is a schematic diagram of the main frame and the C-shaped plate fixedly connected thereto of the application.

[0031] Figure 5 It is a schematic diagram of the left view of the main frame and the blade clamping mechanism of the application.

[0032] Figure 6 It is a schematic diagram of the clamp structure of the application.

[0033] Figure 7 It is a schematic diagram of the control station structure of the application.

[0034] Figure 8A schematic view of the magnetic rheological damping limiting baffle structure of the present application.

[0035] Figure 9 A schematic view of the left view of the single sling clamping blade of the present application.

[0036] In the figure: 1, main frame; 1.1, outer frame; 1.2, crossbeam; 1.3, extension frame; 1.4, telescopic square tube; 1.5, lifting point; 2, blade clamping mechanism; 2.1, C-shaped frame; 2.2, clamping plate; 2.3, hydraulic cylinder group; 3, clamp; 3.1, mounting seat; 3.2, hydraulic cylinder; 3.3, supporting small arm; 3.4, movable chuck; 3.5 rubber plate; 4, control station; 4.1, generator; 4.2, electric control box; 4.3, frequency conversion box; 4.4, hydraulic station; 5, magnetic rheological damping limiting baffle; 5.1, magnetic rheological damper; 5.2, limiting baffle; 6, multi-fan blade series connection hoisting sling; 7, sling; 8, support frame; 9, fan blade. DETAILED DESCRIPTION

[0037] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0038] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0039] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0040] The foregoing is considered as illustrative only of the principles of the application. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the application to the exact construction and practice described. Accordingly, all such variations are intended to be included within the scope of the present application as defined in the following claims, along with full equivalents thereof.

[0041] In the description of the present application, it is to be understood that the orientation terms such as "front", "back", "up", "down", "left", "right", "transverse", "vertical", "horizontal", "top", "bottom", etc. indicate the orientation or positional relationship shown in the drawings, which are merely for the convenience of describing and simplifying the present application, and do not indicate or imply that the devices or elements referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the scope of protection of the present application. The orientation terms "inner", "outer" refer to the inner and outer relative to the contour of the parts themselves.

[0042] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper", etc. can be used herein to describe the spatial positional relationship of one device or feature with respect to other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the devices described in the drawings. For example, if the devices in the drawings are inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0043] In addition, it should be noted that the use of the terms "first", "second", etc. to define parts only facilitates the distinction of the corresponding parts, and the above terms have no special meaning unless otherwise stated, and therefore cannot be understood as limiting the scope of protection of the present application.

[0044] As Figures 1-9As shown, this invention provides a multi-wind turbine blade tandem hoisting device, including multiple main frames 1, multiple blade clamping mechanisms 2 installed within the main frames 1, clamps 3 installed on clamping plates 2.2 of the blade clamping mechanisms 2, magnetorheological damping limiting baffles 5 installed on extension frames 1.3 at both ends of the main frames 1, and a control station 4 installed on the upper part of the main frames 1. The multiple main frames 1 are connected sequentially in the vertical direction, and the upper part of the uppermost main frame 1 is directly connected to the sling 7. The multiple blade clamping mechanisms 2 are arranged parallel and symmetrically at both ends of the inner side of the main frames 1 and have opening and closing functions. The clamps 3 are used to control the clamping of wind turbine blades 9 under the drive of the blade clamping mechanisms 2, and the two ends of the wind turbine blades 9 are placed on the support frame 8. The magnetorheological damping limiting baffles 5 are used to achieve horizontal positioning of the wind turbine blades 9 when clamped. The control station 4 is connected to the main frames 1, the blade clamping mechanisms 2 and the clamps 3, and is used to provide the required energy and precisely control the clamping force. In this embodiment, three main frames 1 can be vertically arranged, and two blade clamping mechanisms 2 are symmetrically arranged at both ends of the inner side of each main frame 1. A set of clamps 3 is installed on each clamping plate 2.2.

[0045] Four lifting points 1.5 are arranged on the main frame 1, which can be connected and lifted by four lifting cables 7; the frames are connected in series by telescopic square tubes 1.4. The blade clamping mechanism includes a C-shaped frame 2.1 and two clamping plates 2.2. The main frame 1 and the C-shaped frame 2.1 are fixedly connected. The two clamping plates 2.2 are respectively connected to the upper and lower parts of the C-shaped frame 2.1. Two hydraulic cylinder groups 2.3 are connected to the outer side of each clamping plate 2.2. One end of each hydraulic cylinder group 2.3 is hinged to the main frame 1, and the other end is hinged to the clamping plate 2.2. It can drive the blade clamping mechanism 2 to open and close the clamping, and use the hydraulic cylinder group 2.3 to control the raising and lowering of the clamping plate 2.2. The clamp 3 includes a mounting base 3.1, a hydraulic cylinder 3.2, a support arm 3.3, a movable clamp 3.4, and a rubber plate 3.5. The control station 4 is installed above the main frame 1 and includes a generator 4.1, an electrical control box 4.2, a frequency converter box 4.3, and a hydraulic station 4.4. The magnetorheological damping limiting baffle 5 extends and is arranged on both sides of the main frame 1, including the magnetorheological damper 5.1 and the limiting baffle 5.2.

[0046] like Figure 4 The main frame 1 shown has five crossbeams 1.2 inside its outer frame 1.1. Four hook connection points 1.5 are located at the top of the outer frame 1.1 of the uppermost main frame 1. Extension frames 1.3 for mounting magnetorheological damping limit plates 5 are located on both sides of the crossbeams 1.2 in the middle. Telescopic square tubes 1.4 are arranged at the four bottom corners of the outer frame 1.1 and are telescopically adjustable to change the vertical spacing between the main frames 1 according to working conditions. The bottommost main frame 1 does not have telescopic square tubes 1.4 at its bottom.

[0047] like Figure 5The shown blade clamping mechanism 2, the C-shaped frame 2.1 is fixedly connected with the cross beam 1.2 at the upper and lower ends. The clamping plate 2.2 is hingedly connected with the C-shaped frame 2.1, and can be controlled up and down under the control of the hydraulic cylinder group 2.3. Each clamping plate 2.2 is connected with two hydraulic cylinders in a staggered manner, and each group of two hydraulic cylinders is controlled to expand or contract to control the opening and closing of the clamping plate 2.2.

[0048] In combination Figure 3 And Figure 6 The shown clamp 3, the mounting seat 3.1 is fixed on the clamping plate 2.2, the supporting arm 3.3 is hingedly connected with the mounting seat 3.1, the movable clamp head 3.4 is hingedly connected with the supporting arm 3.3, and the eight rubber plates 3.5 are hingedly arranged in a two-row and four-column manner on the end of the movable clamp head 3.4 facing the clamped blade. Two clamps 3 are placed in series on the clamping plate 2.2. The supporting arm 3.3 can be rotated around the X-axis under the drive of the hydraulic cylinder 3.2, the movable clamp head 3.4 and the supporting arm 3.3 are hingedly connected and can be rotated around the Z-axis, and the rubber plates 3.5 in the movable clamp head 3.4 can be adaptively rotated and adjusted according to the surface shape of the clamped blade.

[0049] In combination Figure 7 The shown control station 4, the generator 4.1 and the frequency conversion box 4.3 are connected with the electric control box 4.2, and cooperatively control the blade clamping mechanism 2 and the clamp 3 to clamp the blade, wherein the hydraulic station 4.4 is connected with the hydraulic cylinder group 2.3 and the hydraulic cylinder 3.2.

[0050] In combination Figure 3 , 8 And the magnetic rheological damping limiting baffle 5 shown in 8 and 9 is horizontally placed in parallel on both sides of the extension frame 1.3 of the main frame 1. The two magnetic rheological dampers 5.1 at the ends of the limiting baffle 5.2 can provide damping force to limit the blade without damaging the blade.

[0051] In combination Figure 1 , 2 , 8 and 9, the multi-fan blade series hoisting hoist 6 is used when installing the blade. First, the crane is controlled to suspend the hoist to take the main frame 1 close to the three layers of blades stacked on the blade transport ship. Under the precise control of the control station 4, the telescopic square tube 1.4 adjusts the spacing between the three layers of main frames 1 according to the actual working condition, and then the hoist gradually advances horizontally to the contact between the blade and the magnetic rheological damping limiting baffle 5. At this time, the three layers of blades are wrapped by the corresponding three layers of blade clamping mechanisms 2, and then the upper and lower clamping plates 2.2 are closed to approach the blades, and the joints of the clamps 3 are adaptively adjusted to make the rubber plates 3.5 on the movable clamp heads 3.4 tightly contact the surface of the blades, so that the blades are clamped, and then the support frames 8 at both ends of the blades are removed from both sides. The three layers of blades are lifted for operation.

[0052] When the blade is hoisted on the hub, the hydraulic system of the hydraulic station 4.4 and the electric control system of the electric control box 4.2 can cooperatively control the clamp 3 to clamp the blade at the Y-Z plane adjustment position angle or small amplitude rotation around the Z axis until the blade is adjusted to the appropriate installation position and angle.

[0053] The hoist in the application has a large variable pitch range, can perform variable pitch during the blade hoisting process, can meet the requirements of the blade installation angle, and facilitates the installation of the blade; secondly, the hoist can simultaneously load three wind turbine blades for hoisting, improves the efficiency, and meets the construction period requirements.

[0054] The preferred use method of the application is described below:

[0055] First, the sling 7 connects the crane hook with the four lifting points 1.5 of the main frame 1, and then the crane is operated to move the hoist to one side of the three-layer stacked blades, and the opening is towards the side of the blades. The control station 4 controls the telescopic square tube 1.4 to be telescopic according to the actual distance between the blades, so that the blades and the hoist are aligned. Take one of the hoists as an example to illustrate the operation process, and the operation process of the other series of hoists is the same. The crane operates the hoist to approach the blade horizontally, and stops when the blade contacts the magneto-rheological damping limiting baffle 5, at which time the blade is wrapped by the blade clamping mechanism 2.

[0056] Then, under the control of the control station 4, the hydraulic cylinder group 2.3 operates the clamping plate 2.2 to close to the blade, and the further hydraulic cylinder 3.2 drives the support arm 3.3, the movable chuck 3.4 and the rubber plate 3.5 to adaptively adjust the angle, so that the rubber plate 3.5 on the movable chuck 3.4 is tightly attached to the surface of the blade, and the eight groups of clamps 3 clamp the blade together. After checking and confirming that all the blades have been clamped, the support frame 8 at both ends of the blade is removed from both sides, and the clamp completes the clamping operation.

[0057] Then the crane hoists the blade to the required position for installation. During installation, the telescopic square tube 1.4 is telescopic to adjust the distance between the clamps for installation. Take one of the hoists as an example to illustrate the operation process, and the operation process of the other series of hoists is the same. The control station 4 controls the movable joint of the clamp 3 to make the clamp clamp the blade to adjust the position angle in the Y-Z plane or small amplitude rotation around the Z axis, so as to adjust to the appropriate installation position and angle for installation. After installation, the crane controls the hoist to change the position and continue the installation work of the next group of blades. In this way, the installation work of the wind power blade is realized.

[0058] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A multi-fan blade tandem hoist spreader, characterized by, The utility model relates to a kind of wind turbine blade installation device, including: Multiple main body frames (1), multiple blade clamping mechanisms (2) installed in main body frame (1), multiple clamps (3), magnetorheological damping limiting baffle (5) and control station (4) installed on the upper portion of main body frame (1), multiple main body frames (1) are sequentially connected in vertical direction, the upper portion of the uppermost main body frame (1) is equipped with structure for being connected with sling (7);Multiple blade clamping mechanisms (2) are symmetrically arranged in the inside of main body frame (1), with opening and closing function;The clamp (3) is installed on blade clamping mechanism (2), for clamping blade under the drive of blade clamping mechanism (2), both ends of blade are placed on support frame (8);Magnetorheological damping limiting baffle (5) is installed on main body frame (1), for realizing horizontal positioning when blade clamping;Control station (4) is connected with main body frame (1), blade clamping mechanism (2) and clamp (3), for providing required energy and accurately controlling clamping force; The blade clamping mechanism (2) includes C-shaped frame (2.1) and two clamping plates (2.2), the C-shaped frame (2.1) is fixedly connected to the crossbeam (1.2) of the main body frame (1), the two clamping plates (2.2) are respectively hinged above and below the C-shaped frame (2.1), and each clamping plate (2.2) is connected with a set of hydraulic cylinder groups (2.3) on the outer side. The hydraulic cylinder groups (2.3) include two hydraulic cylinders (3.2) arranged in a staggered manner, one end of each hydraulic cylinder group (2.3) is hinged to the main body frame (1), and the other end is hinged to the clamping plate (2.2). Each set of two hydraulic cylinders (3.2) expands and contracts to jointly control the rotation of the clamping plate (2.2), thereby realizing the opening and closing action of the two clamping plates (2.2). The clamp (3) includes a mounting seat (3.1), a hydraulic cylinder (3.2), a support arm (3.3), a movable chuck (3.4), and multiple rubber plates (3.5). The mounting seat (3.1) is fixed to the clamping plate (2.2) of the blade clamping mechanism (2). The support arm (3.3) is hingedly connected to the mounting seat (3.1). One end of the hydraulic cylinder (3.2) is hingedly connected to the clamping plate (2.2), and the other end is hingedly connected to the support arm (3.3). The support arm (3.3) is driven to rotate around the X-axis by the hydraulic cylinder (3.2). The movable chuck (3.4) is hingedly connected to the support arm (3.3) and can rotate around the Z-axis. The multiple rubber plates (3.5) are arrayed and hingedly connected to the movable chuck (3.4) on the side facing the clamped blade. The rubber plates (3.5) rotate to adjust the angle according to the surface shape of the clamped blade. Two clamps (3) are placed in series on each clamping plate (2.2). Adjacent two main body frames (1) are connected by telescopic square tubes (1.4). The control station (4) controls the movable joints of the clamp (3), so that the clamp (3) adjusts the position angle or rotates slightly around the Z-axis to adjust to the appropriate installation position and angle for installation.

2. The multi-fan vane tandem lift spreader of claim 1, wherein, The main frame (1) comprises an outer frame (1.1), the inner side of the outer frame (1.1) is provided with a plurality of cross beams (1.2), the blade clamping mechanism (2) is connected with the cross beam (1.2), the outer frame (1.1) is provided with an extension frame (1.3), the extension frame (1.3) is connected at the two ends of the middle cross beam (1.2) and is close to the blade clamping mechanism (2) located at the outer side, and the extension frame (1.3) on the two sides is respectively provided with the magneto-rheological damping limiting baffle (5).

3. The multi-fan vane tandem lift sling of claim 1, wherein, The control station (4) is installed on the upper part of the uppermost main frame (1) and comprises a generator (4.1), an electric control box (4.2), a frequency conversion box (4.3) and a hydraulic station (4.4), the generator (4.1) and the frequency conversion box (4.3) are connected with the electric control box (4.2), and the hydraulic station (4.4) cooperatively controls the blade clamping mechanism (2) and the clamp (3) to clamp the blade.

4. The multi-fan vane tandem lift sling of claim 1, wherein, The magneto-rheological damping limiting baffle (5) is arranged on the extension frame (1.3) on the two sides of the main frame (1) and comprises two magneto-rheological dampers (5.1) and a limiting baffle (5.2), two horizontally parallel magneto-rheological dampers (5.1) are respectively arranged on each extension frame (1.3), and the limiting baffle (5.2) is connected at the end of the two magneto-rheological dampers (5.1).

5. The multi-fan vane tandem lift sling of claim 2, wherein, A plurality of lifting points (1.5) are arranged at the upper end of the outer frame (1.1) of the uppermost main frame (1), the lifting points (1.5) are used for being connected with lifting ropes (7) to realize lifting of the plurality of main frames (1).

6. The multi-fan vane tandem lift sling of claim 2, wherein, The telescopic square tube (1.4) is arranged at the bottom of the outer frame (1.1) on the upper side and has a telescopic function, and the vertical spacing between two adjacent main frames (1) can be adjusted up and down according to the working condition.

7. A method of using a multi-fan vane tandem lift sling as claimed in any one of claims 1 to 6, characterised in that, The method comprises the following steps: When the blade is installed, first, the crane is controlled to suspend the lifting tool to lift the main frame (1) close to the blade stacked on the blade transport ship, under the precise control of the control station (4), the telescopic square tube (1.4) adjusts the spacing between the plurality of main frames (1) according to the actual working condition, then the lifting tool gradually advances horizontally to the position where the blade contacts the magneto-rheological damping limiting baffle (5), at this time, the plurality of blades are correspondingly wrapped by the plurality of blade clamping mechanisms (2), then the upper and lower clamping plates (2.2) are closed to close the blades, the joints of the clamp (3) are adaptively adjusted to make the rubber plate (3.5) on the movable chuck (3.4) close to the surface of the blade, the blade is clamped, then the support frame (8) at the two ends of the blade is removed from the two sides, and the plurality of blades are lifted for operation.

8. The method of using a multiple fan blade tandem lift sling of claim 7, wherein, The method comprises the following steps: Firstly, the sling (7) connects the crane hook with the four lifting points of the main frame (1), and then the crane is operated to move the lifting tool to the side of the multi-layer stacked blades, and the opening is towards the side of the blades; the control station (4) controls the telescopic square tube (1.4) to extend or retract according to the actual distance between the blades, so that the blades and the lifting tool are aligned; taking one lifting tool as an example, the operation process of the other series of lifting tools is the same; the crane operates the lifting tool to move horizontally towards the blade direction until the blade contacts the magneto-rheological damping limiting baffle (5) and stops, at this time the blade is wrapped by the blade clamping mechanism (2); Then under the control of the control station (4), the hydraulic cylinder group (2.3) operates the clamping plate (2.2) to close to the blade, and the further hydraulic cylinder (3.2) drives the support arm (3.3), the movable chuck (3.4) and the rubber plate (3.5) to adaptively adjust the angle, so that the rubber plate (3.5) on the movable chuck (3.4) is close to the surface of the blade, and the multiple clamps (3) jointly clamp the blade; after checking and confirming that all the blades have been clamped, the support frame (8) at both ends of the blade is removed from both sides, and the clamp (3) completes the clamping operation; Then the crane hoists the blade to the required position for installation; during installation, from top to bottom, the telescopic square tube (1.4) adjusts the distance between the clamps (3) to prepare for installation; taking one lifting tool as an example, the operation process of the other series of lifting tools is the same; the control station (4) controls the movable joint of the clamp (3), so that the clamp (3) clamps the blade to adjust the position angle in Y-Z plane or rotate around Z axis with small amplitude, so as to adjust to the appropriate installation position and angle for installation; after installation, the crane controls the lifting tool to change position and continue to install the next group of blades; in this way, the installation of the wind power blade is realized.

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