Coating forming method of gel coat for wind driven generator blade

Abstract

The invention relates to the technical field of blade spraying, in particular to a coating forming method of a gel coat for a wind driven generator blade. Comprising a moving frame and a material storage box fixed to the bottom of the moving frame and used for containing raw materials, injection pipes opposite in injection direction are arranged above the material storage box at intervals, the injection pipes are fixedly connected with the moving frame, and the injection pipes communicate with a pump body stretching into the material storage box through guide pipes; a protection mechanism used for surrounding the blades is arranged between the upper injection pipe and the lower injection pipe, the end, located on the injection pipes, of the protection mechanism is an air inlet end, and the far end is an exhaust end. Air in the second air bag is released from the air hole, air flow flows out from the exhaust hole, and therefore negative pressure is formed at the end of the air flow channel, spraying raw materials are sucked, the spraying raw materials carried in the air flow can be attached to the side face of the sealing ring, the sealing ring is subjected to the same spraying treatment while the surface of the blade is sprayed, and the spraying efficiency of the blade is improved. And the consistency of the appearance of the whole blade can be kept.

Description

Technical Field

[0001] The invention relates to the technical field of blade spraying, in particular to a coating and molding method of a gel coat for a wind turbine blade. Background Art

[0002] Wind turbine blades are the core components of wind turbines that convert natural wind energy into electrical energy for wind turbines. Coating materials need to be attached to wind turbine blades to effectively protect the blades and extend their service life.

[0003] Since the shape of wind turbine blades is irregular, the blade surface is streamlined, and the root of the blade is thicker than the head of the blade. Therefore, in the prior art, when spraying gel coat on the blade surface, a machine is usually used to move on the blade surface for spraying. After one side of the blade is sprayed, it is rotated by a flip device and then sprayed again.

[0004] 1. Although the use of machine spraying can improve work efficiency and reduce the intensity of manual labor, a sealing ring will be set at the root of the blade in order to cooperate with the hub cover of the wind turbine main engine. Since the spraying angle is fixed and the convexity of the sealing ring makes its side surface located on the outer surface of the blade, it is difficult for it to directly contact the sprayed raw materials relative to other flat or concave surfaces, and secondary spraying is required, which affects work efficiency.

[0005] 2. By adopting the single-sided spraying method, the middle part of the blade has a relatively flat and wide area, which can better adhere to the sprayed raw materials. In contrast, the leading and trailing edges of the blade will cause the raw materials to be unevenly distributed in these areas due to the special shape and curvature. Summary of the invention

[0006] The object of the present invention is to provide a method for coating and molding a gel coat for a wind turbine blade, so as to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides a method for coating and molding a gel coat for a wind turbine blade, comprising a mobile frame and a material storage box fixed at the bottom of the mobile frame for containing raw materials, spray pipes with opposite spraying directions are arranged above the material storage box, the spray pipes are fixedly connected to the mobile frame, and the spray pipes are connected to a pump body extending into the material storage box through a conduit. The specific steps of the spraying method are as follows: S1. Make sure the blade surface is clean, dust-free, oil-free and other impurities. If necessary, use detergent and sandpaper to pre-treat the surface to obtain ideal adhesion; S2. Select appropriate gel coat material according to the required color and performance requirements, and mix the curing agent and other additives in the storage box according to the proportion; S3, the pump body transports the raw materials in the material storage box to the injection pipe and sprays them out from the injection pipe by moving the mobile frame along the blade, so as to realize the spraying of the blade and improve the appearance quality and durability of the coating; A protective mechanism for surrounding the blades is arranged between the upper and lower spray pipes, wherein one end of the protective mechanism located on the spray pipe is the air inlet end, and the far end is the exhaust end, and brackets are fixedly connected between the two sides of the protective mechanism and the movable frame, and an air guide mechanism for connecting the air inlet end with the exhaust end is symmetrically arranged on the outside of the protective mechanism. When spraying the blades, the air guide mechanism is used to make the paint sprayed from the spray pipe flow to the leading edge and the trailing edge of the blade, and the air flow is discharged from the exhaust end after being guided by the air guide mechanism, so that the negative pressure formed at the exhaust end causes the paint floating inside the protective mechanism to adhere to the sealing ring at the root of the blade.

[0008] As a further improvement of the present technical solution, the protective mechanism includes a suction plate located on both sides of the blade, the upper and lower ends of the suction plate are fixedly connected with a support tube sleeved on the injection pipe, the support tube is fixedly connected to the injection pipe, the middle part of the suction plate is bent outward, and a plurality of air inlet holes are opened along the inner circle of the bent position, so that when the injection pipe sprays the raw material onto the blade, the air guide mechanism is used to draw air to form a negative pressure around the air inlet holes to attract the sprayed raw material, so that the raw material flows to the leading edge and trailing edge of the blade, thereby controlling the distribution of the raw material on the leading edge and trailing edge of the blade.

[0009] As a further improvement of the present technical solution, the protective mechanism also includes a protective tube which is away from the air inlet end and fixedly connected to the suction plates on both sides. The negative pressure formed at the exhaust end by the air guide mechanism is used to make the spraying raw materials drift toward the exhaust end. The protective tube is used to guide the spraying raw materials flowing toward the root of the blade and limit the drifting of the spraying raw materials, so as to spray the side of the exhaust end sealing ring.

[0010] As a further improvement of the technical solution, a guide ring is fixedly connected to the end of the protective tube on the side opposite to the suction plate. The inner diameter of the guide ring is smaller than the inner diameter of the protective tube, and the inner diameter of the guide ring is close to the outer diameter of the blade sealing ring.

[0011] As a further improvement of the present technical solution, the air guide mechanism includes an air pump whose air inlet is connected to the circular hole and is fixed on the outside of the protective tube. The air pump exhaust port is connected to a three-way pipe, and the other two ports are correspondingly connected to the first airbag and the sealing plate. A one-way valve is arranged in the three-way pipe port connected to the first airbag. The first airbag is connected to a second airbag located inside the guide ring, and the second airbag is provided with a plurality of air holes.

[0012] As a further improvement of the present technical solution, the second airbag is bonded to the cavity opened inside the guide ring, the exhaust hole and the airflow channel are opened in the guide ring, one end of the airflow channel is connected to the second airbag, and the other end points to the inner wall of the protective tube, and a one-way valve for airflow into the cavity is provided in the airflow channel, and an annular plate for realizing the connection between the airflow channel and the cavity is bonded to one side of the second airbag.

[0013] As a further improvement of the present technical solution, a protective cover fixedly connected to the protective tube is provided on the outside of the first airbag, and a baffle is fixedly connected to the protective cover on the side opposite to the vacuum pump. Under normal conditions, the middle part of the baffle is in contact with the first airbag, and notches are formed on the protective cover at the upper and lower ends of the baffle.

[0014] As a further improvement of the technical solution, a piston rod is fixedly connected to both ends of the blocking plate, and the piston rod is slidably connected to a piston cylinder. The return spring sleeved on the piston rod is located in the piston cylinder, and the piston cylinder is fixed to the end of the protective cover, and through holes connecting to the outside are respectively opened at both ends of the piston cylinder.

[0015] As a further improvement of the present technical solution, a scraper is attached to the inner wall of the suction plate, and the end of the scraper extends into the protective tube and is fixedly connected with a convex plate. The convex plate slides in a limiting groove opened in the protective tube, and one end of the convex plate away from the connection with the scraper extends into the protective cover.

[0016] As a further improvement of the technical solution, the end of the convex plate is in contact with the first airbag, and a connecting spring is fixedly connected to the opposite side of the convex plate from the contact with the first airbag. The connecting spring is located in the protective cover and abuts against the inner wall of the protective cover.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. In the coating and molding method of the gel coat for wind turbine blades, the air in the second airbag is released from the air hole, and the airflow flows out from the exhaust hole, thereby forming a negative pressure at the end of the airflow channel to attract the sprayed raw materials. The sprayed raw materials entrained in the airflow will adhere to the side of the sealing ring, so that the sealing ring is sprayed in the same way while the blade surface is sprayed, so that the consistency of the appearance of the entire blade can be maintained.

[0018] 2. In the coating and molding method of the gel coat for wind turbine blades, during the process of spraying raw materials onto the blades through the injection pipe, an air guide mechanism is used to draw air to form a negative pressure around the air inlet to attract the sprayed raw materials, so that the raw materials flow toward the leading edge and the trailing edge of the blades, thereby controlling the distribution of the raw materials on the leading edge and the trailing edge of the blades and improving the coverage effect of the coating on the leading edge and the trailing edge of the blades. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the spraying structure of the injection pipe of the present invention; Figure 3 This is a schematic diagram of the flow direction structure of the spray pipe spraying paint of the present invention; Figure 4 For the present invention Figure 3 A is an enlarged structural diagram; Figure 5 It is a schematic diagram of the partial structure of the material guide ring of the present invention; Figure 6 It is a schematic diagram of the protective tube, guide ring and blade root structure of the present invention; Figure 7 For the present invention Figure 6 The enlarged structural diagram at B in FIG. Figure 8 It is a schematic diagram of the explosion structure of the blocking plate, protective cover and air pump of the present invention; Fig. 9 For the present invention Figure 8 The enlarged structural diagram at C in FIG. Fig.10 It is a schematic diagram of the partial structure of the protective tube and the guide ring of the present invention; Fig.11 It is a schematic diagram of the explosion structure of the vacuum pump, protective cover, blocking plate and second airbag of the present invention.

[0020] The meaning of each number in the figure is: 100, mobile rack; 101, material storage box; 102, bracket; 110, pump body; 111, injection pipe; 112, support pipe; 120, protection mechanism; 121, suction plate; 122, protection tube; 123, guide ring; 124, air flow channel; 125, air inlet; 130, air guide mechanism; 131, air pump; 132, first air bag; 133, second air bag; 134, annular plate; 135, three-way pipe; 140, protective cover; 141, baffle; 150, blocking plate; 151, piston rod; 152, return spring; 153, piston cylinder; 160, connecting spring; 170. Scraper; 171. Convex plate. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0024] like Figure 1 , Figure 2 and Figure 5 As shown, a coating and molding method for a gel coat for a wind turbine blade is provided, comprising a mobile frame 100 and a material storage box 101 fixed at the bottom of the mobile frame 100 for containing raw materials, and spray pipes 111 with opposite spraying directions are arranged above the material storage box 101 at intervals, and the spray pipes 111 are fixedly connected to the mobile frame 100, and the spray pipes 111 are connected to a pump body 110 extending into the material storage box 101 through a conduit. The specific steps of the spraying method are as follows: S1. Make sure the blade surface is clean, dust-free, oil-free and other impurities. If necessary, use detergent and sandpaper to pre-treat the surface to obtain ideal adhesion; S2. Select appropriate gel coat material according to the desired color and performance requirements, and mix curing agent and other additives in the material storage box 101 according to the proportion; S3, the moving frame 100 moves along the blades, and the pump body 110 transports the raw materials in the material storage box 101 to the spray pipe 111 and sprays them out from the spray pipe 111, so as to spray the blades and improve the appearance quality and durability of the coating; A protective mechanism 120 for surrounding the blades is provided between the upper and lower injection pipes 111. The protective mechanism 120 is located at one end of the injection pipe 111 as an air inlet end, and the far end is an exhaust end. Brackets 102 are fixedly connected between the two sides of the protective mechanism 120 and the movable frame 100. The brackets 102 on both sides provide support for the protective mechanism 120 to maintain the stability of the protective mechanism 120.

[0025] An air guide mechanism 130 for connecting the air inlet end and the exhaust end is symmetrically arranged on the outside of the protective mechanism 120. When spraying the blade, the air guide mechanism 130 is used to make the paint sprayed from the injection pipe 111 flow to the leading edge and the trailing edge of the blade. The airflow is guided by the air guide mechanism 130 and discharged from the exhaust end, so that the negative pressure formed at the exhaust end causes the paint scattered inside the protective mechanism 120 to adhere to the sealing ring at the root of the blade, thereby reducing the impact of the paint scattering on the construction area and improving the efficiency of spraying the gel coat on the outside of the blade.

[0026] First, the initial position of the protective mechanism 120 is at the tip of the blade, and the protective mechanism 120 does not contact the blade during movement. Then, the roller at the bottom of the movable frame 100 is driven to move on the guide rail by an external driving device. At the same time, the upper and lower spray pipes 111 can spray the raw materials to the two sides of the blade (i.e., the windward side and the leeward side) respectively.

[0027] Therefore, on the basis of the above, first combine Figure 3 and Figure 4 The structure of the protective mechanism 120 is further disclosed. The protective mechanism 120 includes a suction plate 121 located on both sides of the blade. The upper and lower ends of the suction plate 121 are fixedly connected to a support tube 112 that is sleeved on the injection tube 111. The support tube 112 is fixedly connected to the injection tube 111. The middle part of the suction plate 121 is bent outward, and a plurality of air inlet holes 125 are opened along the inner circle of the bent position, so that when the injection tube 111 sprays the raw material onto the blade, the air guide mechanism 130 is used to draw air to form a negative pressure around the air inlet hole 125 to attract the sprayed raw material, so that the raw material flows to the leading edge and trailing edge of the blade, thereby controlling the distribution of the raw material on the leading edge and trailing edge of the blade and improving the coverage effect of the leading edge and trailing edge of the coating blade.

[0028] It should be noted that a filter may be provided in the air inlet 125 to limit the paint from entering the air pipe.

[0029] Secondly, in Figure 2 , Figure 5 Based on and combined with Figure 6As shown, the protective mechanism 120 also includes a protective cylinder 122 which is away from the air inlet end and fixedly connected to the suction plates 121 on both sides. The negative pressure formed at the exhaust end by the air guide mechanism 130 is used to make the spraying raw materials drift toward the exhaust end. As the travel distance of the device increases, when the sealing ring of the blade moves into the protective cylinder 122, the protective cylinder 122 is used to guide the spraying raw materials flowing to the root of the blade and limit the drifting of the spraying raw materials, so as to spray the side of the sealing ring at the exhaust end, reduce resource waste, and avoid the need for secondary spraying that affects the spraying efficiency.

[0030] A guide ring 123 is fixedly connected to the end of the protective tube 122 on the side opposite to the suction plate 121. The inner diameter of the guide ring 123 is smaller than the inner diameter of the protective tube 122, and the inner diameter of the guide ring 123 is close to the outer diameter of the blade sealing ring. In this way, when the sprayed paint flows inside the protective tube 122, the paint can be restricted so that the paint can be guided to the exhaust end.

[0031] The air guide mechanism 130 draws air from the air inlet end and discharges air from the air outlet end so as to guide the ejected raw materials. Therefore, the structure of the air guide mechanism 130 is disclosed below. The air guide mechanism 130 includes an air pump 131 whose air inlet is connected to the circular hole and fixed to the outside of the protective tube 122. The air pump 131 has an air outlet connected to a three-way pipe 135, and the other two ports are connected to the first air bag 132 and the blocking plate 150 respectively. A one-way valve (combined with the three-way pipe 135) is arranged in the port of the three-way pipe 135 connected to the first air bag 132. Fig.11 As shown, the one-way valve is used to prevent the gas in the first airbag 132 from flowing out when the air pump 131 stops supplying air to the first airbag 132). The first airbag 132 is connected to the second airbag 133 located inside the guide ring 123, and the second airbag 133 is provided with a plurality of air holes. Figure 7 As shown, the second airbag 133 is bonded to the cavity opened inside the guide ring 123, and the exhaust hole and the airflow channel 124 are opened in the guide ring 123. One end of the airflow channel 124 is connected to the second airbag 133, and the other end points to the inner wall of the protective tube 122. A one-way valve for airflow into the cavity is arranged in the airflow channel 124. An annular plate 134 is bonded to one side of the second airbag 133 for realizing the conduction between the airflow channel 124 and the cavity.

[0032] Working principle: During spraying, the port of the three-way pipe 135 corresponding to the sealing plate 150 is in a blocked state, and the vacuum pump 131 transports the sucked air to the first air bag 132 and the second air bag 133. During this process, the air filled in the second air bag 133 is greater than the air discharged from the pores, and the second air bag 133 expands outward to push out the annular plate 134, and the annular plate 134 moves toward the cavity to connect the air flow channel 124, the cavity, and the exhaust hole. The air in the second air bag 133 is released from the pores, and the air flow flows out from the exhaust hole, thereby forming a negative pressure at the end of the air flow channel 124 to attract the sprayed raw materials.

[0033] Next, when the sealing ring at the root of the blade is Figure 7 When the position is located in the protective tube 122, the spray material entrained in the airflow will adhere to the side of the sealing ring, so that the sealing ring is sprayed with the same treatment while the blade surface is sprayed, which can maintain the consistency of the appearance of the entire blade, make the overall look more tidy and beautiful, and reduce resource waste.

[0034] Further, combined with Figure 8 , Fig.10 and Fig.11 As shown, a protective cover 140 fixedly connected to the protective tube 122 is sleeved on the outside of the first airbag 132, and a baffle 141 is fixedly connected to the protective cover 140 on the opposite side of the vacuum pump 131. Under normal circumstances, the middle part of the baffle 141 fits with the first airbag 132, and notches are formed on the protective cover 140 at the upper and lower ends of the baffle 141, so that when the first airbag 132 expands to exceed the notch, the first airbag 132 is used to push the blocking plate 150 outward, so that the blocking plate 150 is separated from the blockage of the corresponding port of the three-way pipe 135.

[0035] When the port blocked by the blocking plate 150 is opened, the air is discharged from the opened port, and the air pump 131 stops inflating the first airbag 132. In addition, the one-way valve provided in the port of the three-way pipe 135 connected to the first airbag 132 prevents the air in the first airbag 132 from flowing out. At this time, the gas is gradually released from the air hole of the second airbag 133 until the air is discharged. Figure 7 The annular plate 134 is reset and cuts off the communication between the air flow channel 124 and the cavity.

[0036] In addition, in order to prevent the blocking plate 150 from being separated from the corresponding port under the action of air pressure during the process of inflating the first airbag 132, Fig. 9As shown, piston rods 151 are fixedly connected at both ends of the blocking plate 150, and piston cylinders 153 are slidably connected to the piston rods 151. The return spring 152 sleeved on the piston rod 151 is located in the piston cylinder 153. The piston cylinder 153 is fixed at the end of the protective cover 140, and through holes communicating with the outside are respectively opened at both ends of the piston cylinder 153. In this way, when the blocking plate 150 is opened, the elastic potential energy of the return spring 152 needs to be overcome. When the blocking plate 150 is separated from the blocking of the port and the first airbag 132 is deflated, the return spring 152 changes from a compressed state to a released state, and in this process, the air in the piston cylinder 153 is slowly discharged from the through hole to the outside, and the blocking plate 150 gradually resets the blocking of the port, and then the above process is repeated again.

[0037] That is to say, as the spray continues to move on the blades, the negative pressure formed at the end of the airflow channel 124 is intermittent. When the sealing plate 150 blocks the port, the first airbag 132 is inflated and negative pressure is formed around the airflow channel 124. Otherwise, no negative pressure is generated around the airflow channel 124.

[0038] In addition, considering the Figure 4 During the process of the vacuum pump 131 pumping air, the spraying material may cause the air inlet 125 to be blocked, thereby affecting the effect of the air pumping. Figure 4 Based on and combined with Fig.10 As shown, a scraper 170 is attached to the inner wall of the suction plate 121, and the end of the scraper 170 extends into the protective tube 122 and is fixedly connected with a convex plate 171. The convex plate 171 slides in a limiting groove provided in the protective tube 122, and one end of the convex plate 171 away from the connection with the scraper 170 extends into the protective cover 140, and the end of the convex plate 171 is attached to the first airbag 132, and the opposite side of the convex plate 171 attached to the first airbag 132 is fixedly connected with a connecting spring 160, and the connecting spring 160 is located in the protective cover 140 and abuts against the inner wall of the protective cover 140. In this way, during the expansion of the first airbag 132, the first airbag 132 pushes the convex plate 171 outward so that the scraper 170 cleans the spraying material attached to the air inlet 125, ensuring that the air inlet 125 is unobstructed, so as to inflate the first airbag 132. Fig.10 The arrow in FIG. 1 indicates the moving direction of the scraper 170 .

[0039] And in the process of the protruding plate 171 moving outward, the elastic potential energy of the connecting spring 160 increases, the first airbag 132 is squeezed, the air flow speed flowing out of the air hole of the second airbag 133 increases, and the negative pressure generated around the airflow channel 124 also increases. When the first airbag 132 passes over the gap, the first airbag 132 pushes the sealing plate 150 outward to make the sealing plate 150 detach from the port, and then the air in the second airbag 133 is slowly released until it is reset.

[0040] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for coating and molding a gel coat for a wind turbine blade, characterized in that: The invention comprises a movable frame (100) and a material storage box (101) fixed at the bottom of the movable frame (100) for containing raw materials. Spray pipes (111) with opposite spraying directions are arranged above the material storage box (101). The spray pipes (111) are fixedly connected to the movable frame (100), and the spray pipes (111) are connected to a pump body (110) extending into the material storage box (101) through a conduit. The specific spraying method steps are as follows: S1. Make sure the blade surface is clean, dust-free, oil-free and other impurities. If necessary, use detergent and sandpaper to pre-treat the surface to obtain ideal adhesion; S2. Select appropriate gel coat material according to the desired color and performance requirements, and mix the curing agent and other additives in a material storage box (101) according to the proportion; S3, the moving frame (100) moves along the blade, and the pump body (110) transports the raw material in the material storage box (101) to the spray pipe (111) and sprays it out from the spray pipe (111), so as to achieve spraying on the blade and improve the appearance quality and durability of the coating; A protective mechanism (120) for surrounding a blade is provided between the upper and lower spray pipes (111); one end of the protective mechanism (120) located on the spray pipe (111) is an air inlet end, and the far end is an air outlet end; brackets (102) are fixedly connected between the two sides of the protective mechanism (120) and the movable frame (100); an air guide mechanism (130) for connecting the air inlet end with the air outlet end is symmetrically provided outside the protective mechanism (120); when spraying the blade, the paint sprayed from the spray pipe (111) is flowed toward the leading edge and the trailing edge of the blade by the air guide mechanism (130); the air flow is discharged from the air outlet end after being guided by the air guide mechanism (130), so that the negative pressure formed at the air outlet end causes the paint floating inside the protective mechanism (120) to adhere to the sealing ring at the root of the blade.

2. The method for coating and molding a gel coat for a wind turbine blade according to claim 1, characterized in that: The protection mechanism (120) comprises a material suction plate (121) located on both sides of the blade, the upper and lower ends of the material suction plate (121) are fixedly connected to a support tube (112) sleeved on the injection tube (111), the support tube (112) is fixedly connected to the injection tube (111), the middle part of the material suction plate (121) is bent outward, and a plurality of air inlet holes (125) are provided along the inner circle of the bent position, so that when the injection tube (111) sprays the raw material onto the blade, the air guide mechanism (130) is used to draw air to form a negative pressure around the air inlet holes (125) to attract the sprayed raw material, so that the raw material flows toward the leading edge and the trailing edge of the blade, thereby controlling the distribution of the raw material on the leading edge and the trailing edge of the blade.

3. The method for coating and molding a gel coat for a wind turbine blade according to claim 2, characterized in that: The protection mechanism (120) further comprises a protection tube (122) which is located away from the air inlet end and fixedly connected to the suction plates (121) on both sides. The negative pressure formed at the exhaust end by the air guide mechanism (130) causes the spraying material to drift toward the exhaust end. The protection tube (122) is used to guide the spraying material flowing toward the root of the blade and to limit the drifting of the spraying material, thereby spraying the side of the exhaust end sealing ring.

4. The method for coating and molding a gel coat for a wind turbine blade according to claim 3, characterized in that: A material guide ring (123) is fixedly connected to the end of the protective tube (122) on the side opposite to the material suction plate (121); the inner diameter of the material guide ring (123) is smaller than the inner diameter of the protective tube (122); and the inner diameter of the material guide ring (123) is close to the outer diameter of the blade sealing ring.

5. The method for coating and molding a gel coat for a wind turbine blade according to claim 3, characterized in that: The air guide mechanism (130) comprises an air pump (131) whose air inlet is connected to the circular hole and is fixed to the outside of the protective tube (122); the air pump (131) has an exhaust port connected to a three-way pipe (135); the other two ports are correspondingly connected to the first air bag (132) and the blocking plate (150); a one-way valve is arranged in the port of the three-way pipe (135) connected to the first air bag (132); the first air bag (132) is connected to a second air bag (133) located inside the guide ring (123); and a plurality of air holes are provided on the second air bag (133).

6. The method for coating and molding a gel coat for a wind turbine blade according to claim 5, characterized in that: The second airbag (133) is bonded to a cavity opened inside the guide ring (123); an exhaust hole and an airflow channel (124) are opened inside the guide ring (123); one end of the airflow channel (124) is connected to the second airbag (133), and the other end points to the inner wall of the protective tube (122); a one-way valve for airflow into the cavity is provided in the airflow channel (124); and an annular plate (134) for achieving communication between the airflow channel (124) and the cavity is bonded to one side of the second airbag (133).

7. The method for coating and molding a gel coat for a wind turbine blade according to claim 5, characterized in that: A protective cover (140) fixedly connected to the protective tube (122) is sleeved on the outside of the first airbag (132), and a baffle (141) is fixedly connected to the protective cover (140) on the side opposite to the vacuum pump (131). Under normal conditions, the middle of the baffle (141) fits the first airbag (132), and notches are formed on the protective cover (140) at the upper and lower ends of the baffle (141).

8. The method for coating and molding a gel coat for a wind turbine blade according to claim 7, characterized in that: A piston rod (151) is fixedly connected to both ends of the blocking plate (150), and the piston rod (151) is slidably connected to a piston cylinder (153). A return spring (152) sleeved on the piston rod (151) is located in the piston cylinder (153). The piston cylinder (153) is fixed to the end of the protective cover (140), and through holes communicating with the outside are respectively formed at both ends of the piston cylinder (153).

9. The method for coating and molding a gel coat for a wind turbine blade according to claim 7, characterized in that: A scraper (170) is attached to the inner wall of the suction plate (121), the end of the scraper (170) extends into the protective tube (122) and is fixedly connected to a convex plate (171), the convex plate (171) slides in a limiting groove provided in the protective tube (122), and an end of the convex plate (171) away from the connection with the scraper (170) extends into the protective cover (140).

10. The method for coating and molding a gel coat for a wind turbine blade according to claim 9, characterized in that: The end of the convex plate (171) is fitted with the first airbag (132), and a connecting spring (160) is fixedly connected to the side of the convex plate (171) opposite to the first airbag (132), wherein the connecting spring (160) is located inside the protective cover (140) and abuts against the inner wall of the protective cover (140).

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