Composite helicopter rotor blade flexible spraying apparatus and use method

Abstract

Provided is a composite helicopter rotor blade flexible spraying apparatus and a use method, relating to the technical field of spray coating. The apparatus comprises support legs, a support base, and a supporting post with self-adaptive height adjustment. The apparatus is flexible in height and highly adaptable, can be applied to rotor blades of various sizes and shapes, and provides a uniform paint application platform for various rotor blade models, thereby avoiding the trouble of having to frequently change equipment due to model variations, and greatly increasing production efficiency. In terms of the method for using the flexible spraying apparatus, detailed operating procedures and specifications have been developed through design and optimization, allowing operators to quickly learn and proficiently apply same. This allows precise paint application to be achieved for both small and large rotor blades, ensuring uniformity and consistency of paint application, and improving rotor blade appearance quality and protective performance. Moreover, a multi-model compatible design reduces equipment investment and space requirements, and lowers production costs for businesses.

Description

A flexible spraying device for helicopter composite material rotor blades and its application method Technical Field

[0001] This invention belongs to the field of spraying technology and relates to a flexible spraying device and method for using helicopter composite material rotor blades. Background Technology

[0002] In the manufacturing process of composite material blades, all areas of the blade surface except for the metal cladding area need to be painted. This effectively prevents corrosion of the composite blades in the natural environment, improving their weather resistance, and also enhances their aesthetics. Currently, the blades are placed on a specialized fixture for painting. The fixture has grooves designed according to the blade thickness, and the blades are placed vertically in these grooves for painting. However, each specialized fixture is only compatible with one type of blade to ensure uniform force distribution. Furthermore, when grinding or storing the blades, which requires them to be laid flat, the specialized fixture cannot be used, necessitating the use of a parking cart, resulting in low processing efficiency and low fixture utilization.

[0003] A patent discloses a blade painting fixture, including a blade fixing device and several blade support devices. The blade fixing device has a fixed wheel and a movable wheel installed at the bottom of the base, a jack installed on the side, a frame installed on the top, a fixing plate connected to the blade root installed on the frame, and a tripod at the bottom for clamping the blade.

[0004] A certain patent relates to a turbine blade spraying fixture, including: a connecting plate, a support rod, a base, an upper cavity and a lower cavity. The support rod is fixedly mounted on the connecting plate, the base is fixedly mounted on the top of the support rod, the lower cavity is fixedly mounted on the base, the upper cavity is mounted vertically above the lower cavity, and locking components for locking turbine blades are provided on the side walls of both the upper cavity and the lower cavity.

[0005] A certain document discloses a low-pressure guide vane spraying fixture, including a support mechanism for supporting the entire fixture on an impeller and a rotating mechanism for driving the entire fixture to rotate on the impeller. The support mechanism is located on one side of the rotating mechanism. Air inlets on a sealing plate and a first vacuum generator are used to inflate and evacuate the interior of the protective groove, allowing the protective sleeve to extend and retract from the groove. This seals both sides of the fan blades to be sprayed, preventing paint from scattering onto the outer area of ​​the blades. Spray nozzles on both sides of a U-shaped frame simultaneously spray the fan blades. A collection hood, a filter plate, and a second vacuum generator are used to evacuate the interior of the U-shaped frame, creating low pressure to reduce paint scattering. This allows the paint sprayed by the nozzles to adhere to the blades on the inner side of the U-shaped frame following the gas flow.

[0006] The tools and methods described in the published literature are all fixed fixtures or highly product-specific, requiring dedicated fixtures for different product specifications. This makes them incompatible with different models and specifications. For example, an automated painting fixture designed specifically for a particular rotor blade model may not be well-suited for other blades with significantly different shapes or sizes, limiting its application in the production of various products. This fails to meet the diverse, small-batch production characteristics of helicopter rotor blades, hindering production flexibility and enabling rapid changeovers to adapt to the painting needs of multiple blade types. Summary of the Invention

[0007] Purpose of the invention

[0008] This invention relates to a flexible spraying device and method for multi-model helicopter composite material rotor blades. The aim is to meet the painting needs of different rotor blade models, improve the efficiency and quality of painting operations, and reduce production costs. Through detailed analysis of the size, shape, and characteristics of different rotor blade models, the limitations of traditional painting equipment when dealing with multiple blade types were identified. Extensive field research and repeated experiments led to the successful design of a multi-model rotor blade painting device. This device is highly flexible and adaptable, suitable for rotor blades of various sizes and shapes, providing a unified painting platform for different models and avoiding the hassle of frequent equipment changes due to model differences, thus greatly improving production efficiency. The usage method has been carefully designed and optimized, with detailed operating procedures and specifications established, enabling operators to quickly master and skillfully apply the device. Precise painting can be achieved on both small and large rotor blades, ensuring uniformity and consistency, improving the appearance quality and protective performance of the blades. Furthermore, the multi-model design reduces equipment investment and space occupation, lowering production costs and bringing higher economic benefits to enterprises. It also provides an innovative solution for the rotor blade painting industry, promoting technological progress and development within the industry.

[0009] Technical solution

[0010] A flexible spraying device for helicopter composite rotor blades comprises support feet, support bases, and an adaptively adjustable support cylinder. The support base is made of metal and is a regular cuboid with a length of l1, a width of w1, and a height of d1. Its surface is designed with intersecting circular deep-hole grooves, each with a diameter of D0. Hard rubber and sponge, both with a diameter of D1, are placed within the grooves. The sponge inside the deep holes ensures that the support cylinder springs back to its original height after the rotor blade is removed from the device. The groove depth is designed to be H0. The first layer at the bottom of the groove is hard rubber, followed by sponge, and then another layer of hard rubber, repeating this process until the top layer is entirely hard rubber. After stacking n layers, a support layer is formed, with a designed thickness of H1. The stiffness coefficient of the hard rubber in the grooves is k1, the stiffness coefficient of the sponge is k2, and the initial thickness is H1. The height of the support cylinder is H2, and its bottom radius is r, where r = D1 / 2, and its shape is cylindrical.

[0011] Furthermore, the support cylinder is covered with plastic.

[0012] Furthermore, the coating plastic is specifically polytetrafluoroethylene (PTFE).

[0013] Furthermore, the distance between D0 and D1 is 0.2mm to 0.3mm.

[0014] Furthermore, the thickness of both the single-layer hard rubber and the single-layer sponge is 10mm.

[0015] Furthermore, H0-H1 = 30mm~40mm.

[0016] Furthermore, the supporting cylinders are made of high-strength metal.

[0017] Furthermore, the adjustment mechanism of the flexible spraying device includes the following:

[0018] (1) Calculation of force equilibrium relationship

[0019] 1) Let the weight of the blade be G, and the supporting force of the support column and support layer be N. Under equilibrium conditions, according to the force balance, we can obtain: G=N.

[0020] 2) When the blades are placed on the support device, the weight of the blades causes the rigid rubber support to deform, generating an upward elastic force. According to Hooke's Law, N=kx, where k is the stiffness coefficient of the support layer and x is the deformation of the support layer;

[0021] (5) Design of the height of the support column and the support layer

[0022] 1) Assume the width of the blade metal cladding covering the blade edge is h0. To ensure that the drop height of the support column is equal to the width of the blade cladding, and to avoid the blade being blocked and affecting the paint coverage, or the blade tilting and falling due to insufficient drop, the overall height of the support column is designed to be 3h0, and the thickness of the support layer is designed to be at least 2h0.

[0023] (6) Material design of the support layer

[0024] 1) Let the stiffness coefficient of the rubber be k1 and the stiffness coefficient of the sponge be k2. Assume that the compression of the rubber under individual force is x1, the compression of the sponge under individual force is x2, and the overall compression is x. Under the same pressure F, x = x1 + x2 = F / k1 + F / k2. Since F = kx, F = k(F / k1 + F / k2). Therefore, the stiffness coefficient of the support layer k = k1k2 / (k1 + k2).

[0025] 2) Based on the relationship between the compression of the support layer and the descent distance of the support column, the compression of the support layer ∆H should be equal to the descent height h of the support column, i.e., ∆H=h. And ∆H=H1-H, so H=H1-h.

[0026] 3) Therefore, G=N=kx=[k1k2 / (k1+k2)]∆H, the drop height h of the support column is equal to the compression amount ∆H of the support layer and the width h0 of the cladding, so (k1+k2) / k1k2=G / ∆H=G / h0.

[0027] 4) Therefore, based on the width of the package and the weight of the blade, an elastomer can be selected as the material for the support layer.

[0028] (7) Adjustment method

[0029] The adjustment mechanism of this support device primarily relies on the pressure exerted by the blades on the device. When the blades are placed on the support device, their weight causes deformation of the support column and support layer, generating an upward elastic force. This elastic force interacts with the blade weight and the supporting force of the support column to achieve force balance. The height adjustment of the support column automatically responds to changes in blade weight by lowering and compressing the support base, increasing the deformation of the rigid rubber bearing, thus achieving adaptive support for blades of different weights.

[0030] Furthermore, the method of using the flexible spraying device

[0031] The specific method is as follows:

[0032] (1) Preparation stage: Check that the flexible spraying device is fixed and that the support column can extend and retract freely. Check the pressure, flow rate and nozzle status of the spraying system to ensure good spraying effect. Prepare positioning auxiliary equipment and hoisting equipment, and check that their performance is normal.

[0033] (2) Blade insertion: Use a special hoisting device to clamp the blade through the bushing hole and determine the hoisting position and placement position of the blade in the working area.

[0034] (3) Positioning Stage: The operator controls the hoisting equipment via remote control while observing the laser positioning device's indication and adjusting the hoisting equipment's position in real time. Using the red light emitted by the laser positioning device, the propeller blades are centered on the flexible spraying device. During the positioning process, the propeller blades' center of gravity and shape must be considered to ensure stability during hoisting and placement.

[0035] (4) Placement stage: When the blades approach the fixed position, slowly reduce the hoisting speed to ensure that the blades enter the fixed device vertically and smoothly. During the process of the blades entering the fixed device, care should be taken to avoid collisions with the fixed device to prevent damage to the blades or the device. Maintain the hoisting force until the blades are completely supported by the flexible spraying device.

[0036] (5) Inspection stage: Check again whether the clamps and support rods of the fixing device are adjusted in place to ensure that the blades will not move during the painting process.

[0037] (6) Spraying stage: The blades are sprayed by manual spraying or robotic spraying system.

[0038] (7) Drying stage: After the painting is completed, the blades are dried.

[0039] (8) Blade Removal: After the paint layer has dried, use hoisting equipment to remove the blades from the fixing device. During the hoisting process, ensure precise and stable operation to avoid damaging the paint layer. The operator should slowly raise the hoisting equipment while observing the condition of the blades to ensure that the blades leave the fixing device smoothly. Hoist the blades to the designated storage area or transport equipment to complete the delivery.

[0040] (9) Inspection: Conduct a final inspection of the painted blades to check whether the quality, thickness, uniformity and other indicators of the paint layer meet the requirements. If quality problems are found in the paint layer, they can be repaired by sanding or repainting to ensure that the paint quality of the blades meets the standards.

[0041] (10) For different models of products, repeat (1)-(9). The flexible blade spraying device is placed in its original position and continues to be used without replacement.

[0042] The beneficial effects of this application are as follows:

[0043] The flexible spraying device for helicopter composite rotor blades is mainly used for painting the main rotor blades of helicopters. Serving as a support and transfer device for the workpiece, it solves the problems of existing technologies where dedicated tooling imposes significant limitations on workpiece shape, and in multi-variety, small-batch production models, dedicated support devices are costly to manufacture and occupy considerable production space. This method has undergone systematic testing and application verification, and can meet the requirements for automatic painting and transfer of helicopter main rotor blades. Its operational performance is excellent, with 100% compatibility with various types of helicopter rotor blades. It increases workpiece turnover efficiency by 40% and saves 50% of tooling area, fundamentally solving the bottleneck problem of poor flexibility in rotor blade spraying devices on automated painting production lines, and has broad application value. This invention has the following novelty and inventiveness:

[0044] (1) The flexible support mechanism is creatively adopted, which can provide flexible support according to the shape of the main blades of different specifications. Based on the characteristic that the blades are not painted in some areas, the blade wrapping position is used to contact the support device to avoid clamping marks and eliminate the need for secondary painting.

[0045] (2) The design algorithm of flexible spraying device for composite material main blade is proposed for the first time. Based on the blade weight and the width of the cladding, the material of the support layer is selected by theoretical calculation.

[0046] (3) In addition to being used for blade spraying, this invention can also be used for blade transfer and storage. The blade is placed flat on the device, and the support column in the pressure area is lowered, so that the side and bottom of the blade are surrounded by the support column, which enhances the safety of blade transfer and storage. It also has the versatility of multiple blade models, saving the manufacturing cost of blade transfer and storage devices. Attached Figure Description

[0047] Figure 1 shows the structure of a flexible spraying device for composite material blades.

[0048] Figure 2 is a schematic diagram of the spraying state of the composite material blade flexible spraying device.

[0049] Figure 3 is a schematic diagram of the transfer state of the composite material blade flexible spraying device.

[0050] Figure 4 is a flowchart of the device's operation. Embodiments of the present invention

[0051] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions in the embodiments of this invention will be described in more detail below. In the examples, the same or similar reference numerals denote the same or similar components or elements having the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of this invention. The embodiments described below with reference to reference are exemplary and intended to explain this invention, and should not be construed as limiting the invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention. The embodiments of this invention will be described in detail below.

[0052] The flexible spraying device and application method for helicopter composite material rotor blades are as follows:

[0053] 1. Composition and Design Algorithm of Flexible Spraying Device

[0054] The flexible spraying device for helicopter rotor blades mainly consists of support feet, support bases, and an adjustable-height support cylinder (Figure 1). The support base is made of metal and is a regular cuboid with a length of l1, a width of w1, and a height of d1. The surface is designed with intersecting circular deep-hole grooves, each with a diameter of D0. Hard rubber and sponge are placed in the grooves, both with a diameter of D1, where D0-D1 = 0.2mm~0.3mm. The sponge inside the deep holes ensures that the support cylinder springs back to its original height after the rotor blade is removed from the device. The groove depth is designed to be H0. The first layer at the bottom of the groove is hard rubber, followed by a sponge, and then another layer of hard rubber, repeating this process until the top layer is entirely hard rubber. Each layer of hard rubber and sponge is 10mm thick. After stacking n layers, a support layer is formed, with a designed thickness of H1, where H0-H1 = 30mm~40mm. Let the stiffness coefficient of the hard rubber in the groove be k1, the stiffness coefficient of the sponge be k2, and the initial thickness be H1. The supporting cylinder is made of high-strength metal. To avoid scratching or denting the surface of the helicopter rotor blades when in contact with them, the supporting cylinder is covered with plastic. Polytetrafluoroethylene (PTFE) is preferred as the covering material to facilitate cleaning after paint application. Let the height of the supporting cylinder be H2, the bottom radius be r, r = D1 / 2, and the shape be cylindrical.

[0055] 2. Adjustment mechanism of flexible spraying device

[0056] (1) Calculation of force equilibrium relationship

[0057] 1) Let the weight of the blade be G, and the supporting force of the support column and support layer be N. Under equilibrium conditions, according to the force balance, we can obtain: G=N.

[0058] 2) When the blades are placed on the support device, the weight of the blades causes the rigid rubber support to deform, generating an upward elastic force. According to Hooke's Law, N=kx (where k is the stiffness coefficient of the support layer and x is the deformation of the support layer).

[0059] (8) Design of the height of the support column and the support layer

[0060] 1) Assume the width of the blade metal cladding covering the blade edge is h0. To ensure that the drop height of the support column is equal to the width of the blade cladding, and to avoid the blade being blocked and affecting the paint coverage, or the blade tilting and falling due to insufficient drop, the overall height of the support column is designed to be 3h0, and the thickness of the support layer is designed to be at least 2h0.

[0061] (9) Material design of support layer

[0062] 1) Let the stiffness coefficient of the rubber be k1 and the stiffness coefficient of the sponge be k2. Assume that the compression of the rubber under individual force is x1, the compression of the sponge under individual force is x2, and the overall compression is x. Under the same pressure F, x = x1 + x2 = F / k1 + F / k2. Since F = kx, F = k(F / k1 + F / k2). Therefore, the stiffness coefficient of the support layer k = k1k2 / (k1 + k2).

[0063] 2) Based on the relationship between the compression of the support layer and the descent distance of the support column, the compression of the support layer ∆H should be equal to the descent height h of the support column, i.e., ∆H=h. And ∆H=H1-H, so H=H1-h.

[0064] 3) Therefore, G=N=kx=[k1k2 / (k1+k2)]∆H, the drop height h of the support column is equal to the compression amount ∆H of the support layer and the width h0 of the cladding, so (k1+k2) / k1k2=G / ∆H=G / h0.

[0065] 4) Therefore, an appropriate elastomer can be selected as the support layer material based on the width of the package and the weight of the blade.

[0066] (10) Adjustment method

[0067] The adjustment mechanism of this support device primarily relies on the pressure exerted by the rotor blades on the device. When the rotor blades are placed on the support device, their weight causes deformation of the support column and support layer, generating an upward elastic force. This elastic force interacts with the rotor blade weight and the supporting force of the support column to achieve force balance. The height adjustment of the support column automatically responds to changes in rotor blade weight by lowering and compressing the support base, increasing the deformation of the rigid rubber bearing, thus achieving adaptive support for rotor blades of different weights. The entire adjustment process requires no manual intervention, ensuring that the support device provides stable and reliable support for the helicopter rotor blades under various operating conditions.

[0068] 3. How to use the flexible spraying device

[0069] The specific method is as follows:

[0070] (1) Preparation stage: Check that the flexible spraying device is fixed and that the support column can extend and retract freely. Check the pressure, flow rate and nozzle status of the spraying system to ensure good spraying effect. Prepare positioning auxiliary equipment and hoisting equipment, and check that their performance is normal.

[0071] (2) Blade insertion: Use a special hoisting device to clamp the blade through the bushing hole and determine the hoisting position and placement position of the blade in the working area.

[0072] (3) Positioning Stage: The operator controls the hoisting equipment via remote control while observing the laser positioning device's indication and adjusting the hoisting equipment's position in real time. Using the red light emitted by the laser positioning device, the operator adjusts the position of the paddles on the flexible spraying device to be centered. During the positioning process, the paddles' center of gravity and shape must be considered to ensure the stability of the hoisting and placement process.

[0073] (4) Placement stage: When the blade approaches the fixed position, slowly reduce the hoisting speed to ensure that the blade enters the fixed device vertically and smoothly (Figure 2). During the process of the blade entering the fixed device, care should be taken to avoid collision with the fixed device to avoid damage to the blade or the device. Maintain the hoisting force until the blade is completely supported by the flexible spraying device.

[0074] (5) Inspection stage: Check again whether the clamps and support rods of the fixing device are adjusted in place to ensure that the blades will not move during the painting process.

[0075] (6) Spraying stage: The blades are sprayed by manual spraying or robotic spraying system.

[0076] (7) Drying stage: After the painting is completed, the blades are dried.

[0077] (8) Blade Removal: After the paint layer has dried, use hoisting equipment to remove the blades from the fixing device. During the hoisting process, ensure precise and stable operation to avoid damaging the paint layer. The operator should slowly raise the hoisting equipment while observing the condition of the blades to ensure that the blades leave the fixing device smoothly. Hoist the blades to the designated storage area or transport equipment to complete the delivery.

[0078] (9) Inspection: Conduct a final inspection of the painted blades to check whether the quality, thickness, uniformity and other indicators of the paint layer meet the requirements. If quality problems are found in the paint layer, they can be repaired by sanding or repainting to ensure that the paint quality of the blades meets the standards.

[0079] (10) Paint different models of products: Repeat (1)-(9), the paddle spraying flexible device is placed in the original position and continues to be used without replacement, as shown in Figure 3.

[0080] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein. The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Within the spirit and principles of the present invention, any person skilled in the art may use the disclosed technical content to make changes or modifications to create equivalent embodiments applicable to other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention, any modifications, equivalent substitutions, improvements, etc., should be included within the protection scope of the present invention.

Claims

1. A helicopter composite blade flexible spraying device, characterized in that, It consists of support feet, support base, and an adjustable-height support cylinder. The support base is made of metal and is a regular cuboid with a length of l1, a width of w1, and a height of d1. The surface is designed with intersecting circular deep-hole grooves with a groove diameter of D0. Hard rubber and sponge are placed in the grooves, and the diameter of both the hard rubber and sponge is designed to be D1. The sponge is placed inside the deep holes to ensure that the support cylinder rebounds to its original height after the propeller product is removed from the device. The groove depth is designed to be H0. The first layer at the bottom of the groove is hard rubber, with sponge placed on top of the hard rubber, and then hard rubber is placed on top of that, and so on, with the top layer designed to be hard rubber. After stacking n layers, it becomes the support layer, with a designed support layer thickness of H1. Let the stiffness coefficient of the hard rubber in the groove be k1, the stiffness coefficient of the sponge be k2, and the initial thickness be H1. Let the height of the support cylinder be H2, the bottom radius be r, r=D1 / 2, and the shape be cylindrical.

2. The apparatus of claim 1, wherein, The supporting cylinder is covered with plastic.

3. The apparatus of claim 2, wherein, The coating plastic is specifically polytetrafluoroethylene.

4. The apparatus of claim 3, wherein, The value of D0-D1 is 0.2mm~0.3mm.

5. The apparatus of claim 4, wherein, The thickness of both the single-layer hard rubber and the single-layer sponge is 10mm.

6. The apparatus of claim 5, wherein, The H0-H1 = 30mm~40mm.

7. The apparatus of claim 6, wherein, The supporting cylinder is made of high-strength metal.

8. The apparatus of claim 7, wherein, The adjustment mechanism of the flexible spraying device includes the following: (1) Calculation of force equilibrium relationship 1) Let the weight of the blade be G, and the supporting force of the support column and the support layer be N; under equilibrium conditions, according to the force balance, we can get: G=N; 2) When the blades are placed on the support device, the weight of the blades causes the rigid rubber support to deform, generating an upward elastic force. According to Hooke's Law, N = kx, where k is the stiffness coefficient of the support layer and x is the deformation of the support layer; (2) Design of the height of the support column and the support layer 1) Assume the width of the blade metal cladding covering the blade edge is h0. In order to ensure that the drop height of the support column is equal to the width of the blade cladding, and to avoid the blade being blocked and affecting the paint coverage, or the blade tilting and falling due to insufficient drop, the overall height of the support column is designed to be 3h0, and the thickness of the support layer is designed to be at least 2h0. (3) Material design of the support layer 1) Let the stiffness coefficient of the rubber be k1 and the stiffness coefficient of the sponge be k2; assume that the compression of the rubber under individual force is x1, the compression of the sponge under individual force is x2, and the overall compression is x. Under the same pressure F, x = x1 + x2 = F / k1 + F / k2. Since F = kx, F = k(F / k1 + F / k2). Therefore, the stiffness coefficient of the support layer k = k1k2 / (k1 + k2). 2) Based on the relationship between the compression of the support layer and the descent distance of the support column, the compression of the support layer ∆H should be equal to the descent height h of the support column, that is, ∆H=h; and ∆H=H1-H, so H=H1-h; 3) Therefore, G=N=kx=[k1k2 / (k1+k2)]∆H, the drop height h of the support column is equal to the compression amount ∆H of the support layer and the width h0 of the cladding, therefore (k1+k2) / k1k2=G / ∆H=G / h0; 4) Therefore, based on the width of the package and the weight of the blade, an elastomer can be selected as the material for the support layer; (4) Adjustment method The adjustment mechanism of this support device mainly relies on the pressure of the blades on the device. When the blades are placed on the support device, the weight of the blades causes the support column and support layer to deform, thereby generating an upward elastic force. The elastic force of the support column and support layer interacts with the weight of the blades and the supporting force of the support column to achieve force balance. The height adjustment of the support column will automatically respond to the change of the blade weight. By lowering and squeezing the support seat, the deformation of the rigid rubber support will increase, thereby achieving adaptive support for blades of different weights.

9. The method of using the device of claim 8, wherein, Includes the following steps: (1) Preparation stage: Check that the flexible spraying device is fixed and that the support column can extend and retract freely; check the pressure, flow rate and nozzle status of the spraying system to ensure good spraying effect; Prepare positioning auxiliary equipment and hoisting equipment, and check that their performance is normal; (2) Blade insertion: Use a special hoisting device to clamp the blade through the bushing hole, and determine the hoisting position and placement position of the blade in the working area; (3) Positioning stage: The operator controls the hoisting equipment through the remote control and observes the indication of the laser positioning device to adjust the position of the hoisting equipment in real time; using the red light emitted by the laser positioning device, the position of the blades on the flexible spraying device is adjusted to be centered; during the positioning process, the center of gravity and shape of the blades should be taken into account to ensure the stability of the hoisting and placement process. (4) Placement stage: When the blade is close to the fixed position, slowly reduce the hoisting speed to ensure that the blade enters the fixed device vertically and smoothly; during the process of the blade entering the fixed device, care should be taken to avoid collision with the fixed device to avoid damage to the blade or the device; maintain the hoisting force until the blade is completely supported by the flexible spraying device. (5) Inspection stage: Check again whether the clamps and support rods of the fixing device are adjusted in place to ensure that the blades will not move during the painting process; (6) Spraying stage: The blades are sprayed by manual spraying or a robotic spraying system; (7) Drying stage: After the painting is completed, the blades are dried; (8) Blade removal: After the paint layer dries, use hoisting equipment to remove the blades from the fixed device; during the hoisting process, ensure the operation is accurate and stable to avoid damage to the paint layer; the operator should slowly raise the height of the hoisting equipment while observing the condition of the blades to ensure that the blades leave the fixed device smoothly; hoist the blades to the designated storage area or transport equipment to complete the delivery. (9) Inspection: Conduct a final inspection of the painted blades to check whether the quality, thickness, uniformity and other indicators of the paint layer meet the requirements; if quality problems are found in the paint layer, they can be repaired by sanding or repainting to ensure that the paint quality of the blades meets the standards.

10. The method of use of claim 9, wherein, It also includes (10) painting different models of products: repeat (1)-(9), the blade spraying flexible device is placed in the original position and continues to be used without replacement.

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