Wind power blade manufacturing method

Abstract

The wind power blade manufacturing method comprises the steps that a first shell and a base plate are provided, the inner surface of the first shell is provided with a first bonding face, and the base plate is arranged on the first bonding face; a composite material plate is laid on the base plate, and an adhesive is arranged on the composite material plate; providing a second shell and a web plate, and connecting the web plate with the second shell; the first shell and the second shell are subjected to first-time mold closing, the web plate makes contact with the adhesive on the composite material plate, and a first interval is formed between the web plate and the composite material plate; the adhesive on the composite material plate is cured, and the composite material plate is connected with the web plate; the first shell and the second shell are subjected to mold opening, the composite material plate is separated from the base plate, the base plate is removed, and an adhesive is arranged on the first bonding face; the first shell and the second shell are subjected to secondary mold closing, the composite material plate makes contact with the adhesive on the first bonding face, and a second distance is formed between the composite material plate and the first bonding face; and the adhesive arranged on the first bonding surface is cured, and the composite material plate is connected with the first shell.

Description

Technical Field

[0001] The present application relates to the field of wind power generation, and in particular to a method for manufacturing wind power blades. Background Art

[0002] In recent years, wind energy, as a large-scale commercial clean renewable energy, has received widespread attention from all countries. With the rapid development of the wind power industry, wind turbine blades are constantly increasing in size. Wind turbine blades are the core components of wind turbines to capture wind energy, and their operating status is directly related to the utilization efficiency of wind energy. At present, the length of wind turbine blades reaches 40 meters (m) to more than 100 meters, and the root diameter of wind turbine blades reaches 2 meters to more than 4 meters. For example, the length of large wind turbine blades generally exceeds 80 meters. The thickness of the main beam of a wind turbine blade is generally more than 50 millimeters (mm), and the width is also between 300 mm and 600 mm. The wind turbine blade also includes a web connected to the main beam. In the wind turbine blade forming process, both ends of the web need to be bonded to the corresponding main beam. During the processing, a bonding gap needs to be reserved between the web and the corresponding main beam. The bonding gap is used to accommodate the adhesive. The stability of the bonding gap between the web and the corresponding main beam has an impact on the bonding strength between the web and the main beam. The instability of the bonding gap will affect the connection quality between the web and the main beam, and ultimately affect the quality of the wind turbine blade. Summary of the invention

[0003] The present application provides a method for manufacturing wind turbine blades, which is beneficial to improving production efficiency and quality of wind turbine blades.

[0004] The embodiment of the present application provides a method for manufacturing a wind turbine blade. The wind turbine blade includes a first shell, a second shell and a web. The method for manufacturing a wind turbine blade includes:

[0005] Providing a first shell and a backing plate, wherein the inner surface of the first shell has a first bonding surface for bonding with the web, and the backing plate is arranged on the first bonding surface;

[0006] laying a composite material plate on the backing plate, and providing an adhesive on the composite material plate;

[0007] providing a second shell and a web, and connecting the web to the second shell;

[0008] The first shell and the second shell are molded together for the first time, the web plate contacts the adhesive disposed on the composite material plate, and a first distance is formed between the web plate and the composite material plate;

[0009] The adhesive disposed on the composite material plate is cured, and the composite material plate is connected to the web plate;

[0010] Opening the mold of the first shell and the second shell, separating the composite material plate from the backing plate, removing the backing plate, and providing an adhesive on the first bonding surface;

[0011] The first shell and the second shell are molded together for the second time, the composite material plate contacts the adhesive disposed on the first bonding surface, and a second distance is formed between the composite material plate and the first bonding surface;

[0012] The adhesive disposed on the first bonding surface is cured, and the composite material plate is connected to the first shell.

[0013] The method for manufacturing wind turbine blades in the embodiment of the present application uses a pad and a composite material plate to connect the web plate to the composite material plate to form an integral structure, and the pad can prefabricate a stable gap between the composite material plate and the first shell, so that after the pad is removed and the first shell and the second shell are molded together for the second time, the gap between the composite material plate and the first bonding surface is in a stable state and meets the gap standard requirements. The gap between the composite material plate and the first bonding surface is not prone to being too large or too small. Therefore, the method for manufacturing wind turbine blades in the embodiment of the present application can help ensure the stable production efficiency of wind turbine blades, and also help ensure the stable quality of the wind turbine blades themselves.

[0014] In some achievable embodiments, both the backing plate and the composite material plate are flexible plates.

[0015] In some achievable embodiments, the area of ​​the pad is greater than or equal to the area of ​​the first bonding surface.

[0016] In some achievable embodiments, the area of ​​the composite material plate is equal to the area of ​​the first bonding surface.

[0017] In some possible implementations, the first spacing is smaller than the second spacing.

[0018] In some achievable embodiments, the backing plate is bonded to the first bonding surface.

[0019] In some practicable embodiments, a release cloth is disposed between the composite material plate and the backing plate.

[0020] In some practicable embodiments, a release cloth is disposed on the surface of the composite material plate facing the backing plate, and the release cloth disposed on the composite material plate is removed before the first shell and the second shell are molded together for the second time.

[0021] In some practicable embodiments, a release cloth is disposed on the surface of the composite material plate facing away from the backing plate, and the release cloth disposed on the composite material plate is removed before the adhesive is disposed on the composite material plate.

[0022] In some practicable manners, after the first shell and the second shell are molded, the composite material plate and the adhesive connecting the composite material plate and the web are trimmed.

[0023] In some achievable embodiments, the first shell includes a first main beam having a first bonding surface, the second shell includes a second main beam having a second bonding surface, and the web is bonded to the second bonding surface.

[0024] The embodiment of the present application provides a method for manufacturing a wind turbine blade. The wind turbine blade includes a first shell, a second shell and a web. The method for manufacturing a wind turbine blade includes:

[0025] Providing a first shell and a backing plate, wherein the inner surface of the first shell has a first bonding surface for bonding with the web, and the backing plate is arranged on the first bonding surface;

[0026] Laying a release cloth on the backing plate and providing an adhesive on the release cloth;

[0027] providing a second shell and a web, and connecting the web to the second shell;

[0028] The first shell and the second shell are molded together for the first time, the web plate contacts the adhesive disposed on the mold release cloth, and a first distance is provided between the web plate and the mold release cloth;

[0029] The adhesive disposed on the release cloth is cured to form a first adhesive layer, and the release cloth is connected to the web;

[0030] The first shell and the second shell are opened, the release cloth is separated from the backing plate, the backing plate is removed, and an adhesive is provided on the first bonding surface, and the release cloth connected to the first bonding layer is removed;

[0031] The first shell and the second shell are molded together for the second time, the first adhesive layer contacts the adhesive disposed on the first adhesive surface, and a second distance is provided between the first adhesive layer and the first adhesive surface;

[0032] The adhesive disposed on the first bonding surface is cured to form a second bonding layer, and the first bonding layer is connected to the first shell.

[0033] The embodiment of the present application provides a method for manufacturing a wind turbine blade. The wind turbine blade includes a first shell and a second shell. The method for manufacturing a wind turbine blade includes:

[0034] A first shell and a backing plate are provided, wherein the edge of the first shell has a first edge butt joint surface, and the backing plate is arranged on the first edge butt joint surface;

[0035] laying a composite material plate on the backing plate, and providing an adhesive on the composite material plate;

[0036] Providing a second shell, wherein an edge of the second shell has a second edge abutment surface for abutting the first edge abutment surface;

[0037] The first shell and the second shell are molded together for the first time, the second edge butt surface contacts the adhesive provided on the composite material plate, and a first distance exists between the second edge butt surface and the composite material plate;

[0038] The adhesive disposed on the composite material plate is cured, and the composite material plate is connected to the second shell;

[0039] Opening the mold of the first shell and the second shell, separating the composite material plate from the backing plate, removing the backing plate, and providing an adhesive on the first edge butt joint surface;

[0040] The first shell and the second shell are molded together for a second time, the composite material plate contacts the adhesive disposed on the first edge butt joint surface, and a second distance is formed between the composite material plate and the first edge butt joint surface;

[0041] The adhesive disposed on the first edge abutting surface is cured, and the composite material plate is connected to the first shell.

[0042] The embodiment of the present application provides a method for manufacturing a wind turbine blade. The wind turbine blade includes a first shell and a second shell. The method for manufacturing a wind turbine blade includes:

[0043] A first shell and a backing plate are provided, wherein the edge of the first shell has a first edge butt joint surface, and the backing plate is arranged on the first edge butt joint surface;

[0044] Laying a release cloth on the backing plate and providing an adhesive on the release cloth;

[0045] Providing a second shell, wherein an edge of the second shell has a second edge abutment surface for abutting the first edge abutment surface;

[0046] The first shell and the second shell are molded together for the first time, the second edge butt surface contacts the adhesive disposed on the release cloth, and a first distance is provided between the second edge butt surface and the release cloth;

[0047] The adhesive disposed on the release cloth is cured to form a first adhesive layer, and the release cloth is connected to the second shell;

[0048] The first shell and the second shell are opened, the demoulding cloth is separated from the backing plate, the backing plate is removed, and an adhesive is provided on the first edge joint surface, and the demoulding cloth connected to the first adhesive layer is removed;

[0049] The first shell and the second shell are molded together for the second time, the first adhesive layer contacts the adhesive disposed on the first edge butt joint surface, and a second distance exists between the first adhesive layer and the first edge butt joint surface;

[0050] The adhesive disposed on the first edge butt joint surface is cured to form a second adhesive layer, and the first adhesive layer is connected to the first shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0052] Figure 1A schematic diagram of the structure of a wind turbine generator set provided in some embodiments of the present application;

[0053] Figure 2 A schematic diagram of the structure of a blade provided in some embodiments of the present application;

[0054] Figure 3 A schematic diagram of a partial cross-sectional structure of a blade provided in some embodiments of the present application;

[0055] Figure 4 A schematic diagram of a process for manufacturing a wind turbine blade provided in some embodiments of the present application;

[0056] Figure 5 A schematic diagram of a wind turbine blade manufacturing method provided in some embodiments of the present application;

[0057] Figure 6 A schematic diagram of a partial cross-sectional structure of a blade provided in some embodiments of the present application;

[0058] Figure 7 A partial structural schematic diagram of a method for manufacturing a wind turbine blade provided in some embodiments of the present application;

[0059] Figure 8 A schematic diagram of a partial cross-sectional structure of a blade provided in some embodiments of the present application;

[0060] Fig. 9 A schematic diagram of a wind turbine blade manufacturing method provided in some embodiments of the present application;

[0061] Fig.10 A schematic diagram of a wind turbine blade manufacturing method provided in some embodiments of the present application;

[0062] Fig.11 A schematic structural diagram of a method for manufacturing a wind turbine blade provided in some embodiments of the present application.

[0063] In the drawings, the drawings are not necessarily drawn to scale.

[0064] Description of reference numerals:

[0065] 100. Wind turbine generator set;

[0066] 110, leaves;

[0067] 120, first shell; 120a, first bonding surface; 121, first main beam; 122, first edge docking surface;

[0068] 130, second shell; 130a, second bonding surface; 131, second main beam; 132, second edge docking surface;

[0069] 140, belly plate;

[0070] 150, pad;

[0071] 160. Composite material board;

[0072] 170, release cloth;

[0073] 200, adhesive; 210, first adhesive layer; 220, second adhesive layer. DETAILED DESCRIPTION

[0074] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0075] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0076] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0077] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0078] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0079] The term "plurality" used in the present application refers to two or more (including two).

[0080] Figure 1 The structure of the wind turbine generator set 100 is schematically shown. Figure 1 As shown, an embodiment of the present application provides a wind turbine generator set 100 .

[0081] The wind turbine generator set 100 includes a tower, a nacelle and a wind rotor. The nacelle is arranged at the top of the tower. The wind rotor includes a hub and blades 110. The blades 110 are connected to the hub. The hub is connected to the main shaft of the nacelle. The blades 110 can generate torque under the action of wind. The blades 110 and the hub drive the main shaft of the nacelle to rotate, thereby converting wind energy into mechanical energy. The main shaft of the nacelle can be connected to the rotor of the generator, thereby converting mechanical energy into electrical energy.

[0082] Figure 2 The structure of the blade 110 is schematically shown. Figure 3 The partial cross-sectional structure of the blade 110 is schematically shown. Figure 2 and Figure 3 As shown, an embodiment of the present application provides a blade 110. The blade 110 includes a first shell 120, a second shell 130, and a web 140. The web 140 is disposed between the first shell 120 and the second shell 130. Both ends of the web 140 are connected to the first shell 120 and the second shell 130, respectively. The web 140 can support the first shell 120 and the second shell 130.

[0083] The process of manufacturing the wind turbine blade is to first manufacture the first shell 120, the second shell 130 and the web 140 separately, and then connect the web 140 to the second shell 130 to form an integral structure. Then, the first shell 120 and the second shell 130 are molded together, and the first shell 120 and the second shell 130 are bonded, and the web 140 is bonded to the first shell 120, and finally formed into a complete wind turbine blade.

[0084] In the related art, when the first shell 120 and the second shell 130 are in the molded state, the gap between the web 140 and the inner surface of the first shell 120 needs to meet the gap standard requirements, for example, the gap between the web 140 and the inner surface of the first shell 120 is 6±4 millimeters (mm), so that the web 140 and the first shell 120 can be bonded with a predetermined amount of adhesive to ensure that the adhesive is not easy to overflow from the gap between the web 140 and the first shell 120 under the mutual squeezing of the web 140 and the first shell 120, and the problem of insufficient bonding width is not easy to occur. There will be processing size errors in the manufacturing process of the first shell 120, the second shell 130 and the web 140, which will cause the size of the gap between the web 140 and the inner surface of the first shell 120 to be unstable. If the actual gap between the web 140 and the inner surface of the first shell 120 is too small, on the one hand, the adhesive is easy to overflow under the mutual squeezing of the web 140 and the first shell 120, resulting in waste. On the other hand, there is a possibility that the first shell 120 directly squeezes the web 140 and causes the web 140 to be crushed. If the actual gap between the web 140 and the inner surface of the first shell 120 is too large, the degree of squeezing of the adhesive by the web 140 and the first shell 120 is too small, resulting in a small area for the adhesive to be spread, thereby causing the problem of insufficient bonding width. Therefore, the size of the gap between the web 140 and the inner surface of the first shell 120 is unstable, which will lead to unstable production efficiency of the wind turbine blade and unstable quality of the wind turbine blade itself. In addition, before the web 140 and the first shell 120 are formally bonded, it is necessary to test-mold the first shell 120 and the second shell 130, and then manually measure whether the gap between the inner surface of the web 140 and the first shell 120 meets the requirements, which is inefficient. Meanwhile, the internal space of the wind turbine blade is relatively small, so the gap at the wind turbine blade cannot be measured manually.

[0085] The embodiment of the present application provides a method for manufacturing a wind turbine blade, which can improve the stability of the gap between the web 140 and the first shell 120, and at the same time does not require manual measurement of the gap between the web 140 and the inner surface of the first shell 120, which is beneficial to improving production efficiency and wind turbine blade quality.

[0086] Figure 4 The process of the wind turbine blade manufacturing method is schematically shown. Figure 5 The structure of the wind turbine blade manufacturing method is schematically shown. Figure 6 The partial cross-sectional structure of the blade 110 is schematically shown. Figure 4 , Figure 5 and Figure 6 As shown, the embodiment of the present application provides a method for manufacturing a wind turbine blade. The method for manufacturing a wind turbine blade includes:

[0087] A first shell 120 and a backing plate 150 are provided, wherein the inner surface of the first shell 120 has a first bonding surface 120a for bonding with the web 140, and the backing plate 150 is arranged on the first bonding surface 120a;

[0088] Laying a composite material plate 160 on the backing plate 150 and providing an adhesive 200 on the composite material plate 160;

[0089] Providing a second shell 130 and a web 140, and connecting the web 140 to the second shell 130;

[0090] The first shell 120 and the second shell 130 are molded together for the first time, the web 140 contacts the adhesive 200 disposed on the composite material plate 160, and a first distance D1 is formed between the web 140 and the composite material plate 160;

[0091] The adhesive 200 disposed on the composite material plate 160 is cured, and the composite material plate 160 is connected to the web 140;

[0092] The first shell 120 and the second shell 130 are opened, the composite material plate 160 is separated from the backing plate 150, the backing plate 150 is removed, and the adhesive 200 is disposed on the first bonding surface 120a;

[0093] The first shell 120 and the second shell 130 are molded together for the second time, the composite material plate 160 contacts the adhesive 200 disposed on the first bonding surface 120a, and a second distance D2 is formed between the composite material plate 160 and the first bonding surface 120a;

[0094] The adhesive 200 disposed on the first bonding surface 120 a is cured, and the composite material plate 160 is connected to the first shell 120 .

[0095] In the embodiment of the present application, after the first shell 120, the second shell 130 and the web 140 are each processed and manufactured, it is necessary to ensure that when the first shell 120 and the second shell 130 are in the trial mold state, the gap size between the web 140 and the first shell 120 is relatively large. For example, the gap between the web 140 and the first shell 120 is 11±4 millimeters (mm), so that space that meets the requirements can be reserved for setting the pad 150, the composite material plate 160 and the adhesive 200.

[0096] In some achievable ways, the pad 150 laid on the first shell 120 can match the undulating shape of the first bonding surface 120a. The pad 150 laid on the first shell 120 has a uniform thickness. The thickness of the pad 150 can range from 2.5 mm to 3.5 mm. For example, the thickness of the pad 150 can be 3 mm.

[0097] The composite material plate 160 laid on the backing plate 150 can match the surface undulation of the backing plate 150, so that the composite material plate 160 matches the undulation of the first bonding surface 120a. The composite material plate 160 laid on the backing plate 150 has a uniform thickness. The thickness of the composite material plate 160 can range from 1.5 mm to 2.5 mm. For example, the thickness of the composite material plate 160 can be 2 mm.

[0098] In the embodiment of the present application, when the first shell 120 and the second shell 130 are molded for the first time, the web 140 and the composite material plate 160 can squeeze the adhesive 200 set on the composite material plate 160 to spread the adhesive 200. There is a first spacing D1 between the web 140 and the composite material plate 160. The thickness of the cured adhesive 200 is equal to the first spacing D1. The gap between the web 140 and the composite material plate 160 can be in an unstable state, so there is no need to strictly control the gap size between the web 140 and the composite material plate 160, thereby reducing the adverse effects caused by the processing errors of the first shell 120, the second shell 130 and the web 140.

[0099] After the first shell 120 and the second shell 130 complete the first mold closing, the web 140 and the composite material plate 160 are bonded to each other. When the first shell 120 and the second shell 130 are molded for the second time, the gap size between the composite material plate 160 and the first bonding surface 120a is the same as the thickness of the removed pad 150, so the gap between the composite material plate 160 and the first bonding surface 120a is in a stable state, so that the gap between the composite material plate 160 and the first bonding surface 120a is not likely to be too large or too small, so that a predetermined amount of adhesive 200 can be relatively accurately set on the first bonding surface 120a, so as to ensure that the adhesive 200 is not likely to overflow and cause waste under the extrusion of the composite material plate 160 and the first shell 120, and is not likely to have the problem of insufficient bonding width, and at the same time avoid the situation that the first shell 120 is squeezed to the web 140 through the composite material plate 160, causing the web 140 to be crushed.

[0100] The wind turbine blade manufacturing method of the embodiment of the present application, by using the backing plate 150 and the composite material plate 160, connects the web 140 with the composite material plate 160 to form an integral structure, and the backing plate 150 can prefabricate a stable gap between the composite material plate 160 and the first shell 120, so that after the backing plate 150 is removed and the first shell 120 and the second shell 130 are molded for the second time, the gap between the composite material plate 160 and the first bonding surface 120a is in a stable state and meets the gap standard requirements. The gap between the composite material plate 160 and the first bonding surface 120a is not prone to being too large or too small. Therefore, the wind turbine blade manufacturing method of the embodiment of the present application can help ensure the stable production efficiency of the blade 110, and also help ensure the stable quality of the blade 110 itself. In addition, in the manufacturing process of the blade 110, it is no longer necessary to use the method of manually measuring the gap size, which is conducive to improving work efficiency and solving the problem that the gap near the tip cannot be measured.

[0101] In some achievable ways, the pad 150 is a flexible board. The pad 150 has good supporting performance and deformation performance. The pad 150 can provide stable support for the composite material plate 160. When the pad 150 is laid on the first bonding surface 120a of the first shell 120, the pad 150 can match the undulating shape of the first bonding surface 120a so that the pad 150 fits the first bonding surface 120a, so that a stable gap can be prefabricated between the composite material plate 160 and the first shell 120 after the pad 150 is removed. In some examples, the material of the pad 150 can be rubber.

[0102] In some achievable ways, the composite material plate 160 is a flexible plate. The composite material plate 160 has good deformation performance. When the composite material plate 160 is laid on the pad 150, the composite material plate 160 can match the undulating shape of the pad 150, so that the composite material plate 160 is attached to the pad 150, so that the composite material plate 160 can match the undulating shape of the first bonding surface 120a, and then after removing the pad 150, a stable gap is formed between the composite material plate 160 and the first shell 120. In some examples, the composite material plate 160 may include a woven cloth and a resin. Exemplarily, the composite material plate 160 is formed by impregnating the woven cloth with epoxy resin and then waiting for the epoxy resin to cure.

[0103] In some achievable embodiments, the area of ​​the backing plate 150 is greater than or equal to the area of ​​the first bonding surface 120a. After the backing plate 150 is laid on the first bonding surface 120a, the backing plate 150 can cover the first bonding surface 120a. The width of the backing plate 150 is greater than or equal to the width of the first bonding surface 120a.

[0104] Since the width of the backing plate 150 affects the width of the composite material plate 160, when the width of the backing plate 150 is smaller than the width of the first bonding surface 120a, the width of the composite material plate 160 is smaller than the width of the first bonding surface 120a, so that after removing the backing plate 150, the width of the gap formed between the composite material plate 160 and the first shell 120 is smaller than the width of the first bonding surface 120a, which leads to a smaller actual bonding width between the composite material plate 160 and the first bonding surface 120a, resulting in insufficient bonding width, making the connection strength between the composite material plate 160 and the first shell 120 low, affecting the quality of the blade 110. The manner in which the area of ​​the backing plate 150 is greater than or equal to the area of ​​the first bonding surface 120a is conducive to solving the above-mentioned problem. In addition, in the embodiment in which the area of ​​the backing plate 150 is greater than the area of ​​the first bonding surface 120a, the backing plate 150 can be used to cover the first bonding surface 120a relatively easily, which is conducive to reducing the laying position accuracy requirements of the backing plate 150 and reducing the laying difficulty.

[0105] In some achievable embodiments, the area of ​​the composite material plate 160 is equal to the area of ​​the first bonding surface 120a. The width of the composite material plate 160 is equal to the width of the first bonding surface 120a. When the composite material plate 160 and the first bonding surface 120a are bonded by the adhesive 200, the bonding width between the composite material plate 160 and the first bonding surface 120a can meet the bonding requirements, thereby ensuring that the connection strength between the composite material plate 160 and the first housing 120 meets the requirements.

[0106] When the area of ​​the composite material plate 160 is smaller than the area of ​​the first bonding surface 120a, the bonding area between the composite material plate 160 and the first bonding surface 120a is too small, resulting in a decrease in the connection strength between the composite material plate 160 and the first shell 120, affecting the quality of the blade 110. When the area of ​​the composite material plate 160 is larger than the area of ​​the first bonding surface 120a, the adhesive 200 between the composite material plate 160 and the first bonding surface 120a may exceed the boundary of the first bonding surface 120a, causing waste or flash. The method in which the area of ​​the composite material plate 160 is equal to the area of ​​the first bonding surface 120a is conducive to solving the above problems.

[0107] In some achievable embodiments, the first distance D1 between the web 140 and the composite material plate 160 is smaller than the second distance D2 between the composite material plate 160 and the first bonding surface 120a. The thickness of the adhesive 200 between the web 140 and the composite material plate 160 is smaller than the thickness of the adhesive 200 between the composite material plate 160 and the first bonding surface 120a.

[0108] Since the second shell 130 and the web 140 have relatively large weights, the second distance D2 between the composite material plate 160 and the first bonding surface 120a is relatively large, which helps to reduce the possibility of accidental contact between the composite material plate 160 and the first shell 120 under the action of the gravity of the second shell 130 and the web 140 when the first shell 120 and the second shell 130 are molded together.

[0109] In some feasible embodiments, the pad 150 is bonded to the first bonding surface 120a, so that on the one hand, the position of the pad 150 itself can be effectively fixed, reducing the possibility that the pad 150 itself is offset and causing the composite material plate 160 to be offset; on the other hand, the position of the pad 150 itself can be effectively fixed, making it relatively easy to lay the composite material plate 160 on the pad 150, reducing the possibility that the pad 150 is pulled during the laying of the composite material plate 160 and causing the pad 150 to be offset; on the other hand, it is convenient for the subsequent removal of the pad 150, reducing the difficulty of removing the pad 150, and also reducing the possibility of structural damage to the pad 150 or the first shell 120 during the removal of the pad 150.

[0110] In some examples, adhesive is provided on at least one of the backing plate 150 and the first adhesive surface 120a, and then the backing plate 150 and the first adhesive surface 120a are bonded together. Alternatively, the backing plate 150 and the first adhesive surface 120a may be bonded together by a double-sided tape.

[0111] In some feasible embodiments, the pad 150 and the composite material plate 160 are in a non-connected state, that is, the composite material plate 160 is laid on the pad 150 but is not connected to the pad 150, so that when the pad 150 and the composite material plate 160 are separated, the pad 150 and the composite material plate 160 are relatively easy to separate, reducing the possibility that the pad 150 and the composite material plate 160 are pulled by each other, resulting in difficulty in separation and affecting production efficiency.

[0112] In some examples, Figure 7 Schematically shows the partial structure of the wind turbine blade manufacturing method. Figure 7 As shown, a release cloth 170 is disposed between the composite material plate 160 and the backing plate 150. The release cloth 170 can effectively isolate the adhesive 200 disposed on the composite material plate 160 from the backing plate 150. The release cloth 170 can effectively reduce the possibility that the adhesive 200 will infiltrate the composite material plate 160 and then adhere to the backing plate 150, so that when the backing plate 150 and the composite material plate 160 are separated, the backing plate 150 and the composite material plate 160 are relatively easy to separate.

[0113] Exemplarily, a release cloth 170 is disposed on the surface of the composite material plate 160. When the composite material plate 160 needs to be laid on the backing plate 150, the side of the composite material plate 160 provided with the release cloth 170 is directly laid facing the backing plate 150, which is conducive to improving the laying efficiency of the composite material plate 160, and the position of the release cloth 170 itself is not easily offset.

[0114] A release cloth 170 is set on the surface of the composite material plate 160 facing the pad 150. Before the first shell 120 and the second shell 130 are molded together for the second time, the release cloth 170 set on the composite material plate 160 is removed to ensure that the composite material plate 160 can be bonded to the adhesive 200 at the first bonding surface 120a.

[0115] In some examples, a release cloth 170 is disposed on the surface of the composite material plate 160 facing away from the backing plate 150. Before the adhesive 200 is disposed on the composite material plate 160, the release cloth 170 disposed on the composite material plate 160 is removed. Before the adhesive 200 is disposed on the composite material plate 160, the release cloth 170 can protect the composite material plate 160 to reduce the possibility of dirt such as dust contaminating the surface of the composite material plate 160, and reduce the possibility of dirt such as dust mixing into the adhesive 200 and causing bubbles or poor wetting of the adhesive 200.

[0116] Exemplarily, two opposite surfaces of the composite material plate 160 are respectively provided with release cloths 170. When the composite material plate 160 is not in use, the release cloths 170 on both sides can protect the composite material plate 160, facilitate the storage and transportation of the composite material plate 160, and reduce the possibility of accidental scratches and damages to the composite material plate 160.

[0117] In some practicable manners, after the first shell 120 and the second shell 130 are molded, the composite material plate 160 and the adhesive 200 connecting the composite material plate 160 and the web 140 are trimmed. Since the first shell 120 and the second shell 130 are in the molded state, the operator can trim the adhesive 200 in an open space, thereby reducing the difficulty of the trimming work.

[0118] Since the gap between the composite material plate 160 and the web 140 is in an unstable state, the adhesive 200 between the composite material plate 160 and the web 140 may have defects such as flash, insufficient bonding width or bubbles after curing. The operator can perform finishing work such as cutting off the flash, filling glue or grinding the bubble area in an open space to ensure the molding quality of the adhesive 200 between the composite material plate 160 and the web 140, which is beneficial to improve the quality of the blade 110.

[0119] In some achievable ways, Figure 8 Schematically shows a partial cross-sectional structure of the blade. Refer to Figure 8 As shown, the first housing 120 includes a first main beam 121. The first main beam 121 has a first bonding surface 120a. The second housing 130 includes a second main beam 131. The second main beam 131 has a second bonding surface 130a. One end of the web 140 is bonded to the second bonding surface 130a.

[0120] Before the first mold closing of the first housing 120 and the second housing 130, first hoist the web 140 above the second housing 130, and then apply an adhesive 200 on the second bonding surface 130a. The web 140 is fixedly bonded to the second bonding surface 130a, thereby fixing the position of the web 140.

[0121] Both the first main beam 121 and the second main beam 131 have high mechanical strength. Therefore, both ends of the web 140 are bonded to the first main beam 121 and the second main beam 131 respectively, which can help improve the overall structural strength of the blade 110.

[0122] In some examples, the cross-sectional shape of the web 140 can be in the shape of "匚" or "工". The adhesive 200 can be a resin glue.

[0123] In some implementable ways, before the second mold closing of the first housing 120 and the second housing 130, an adhesive 200 is provided on the edge docking surface of at least one of the first housing 120 and the second housing 130. After the second mold closing of the first housing 120 and the second housing 130, the web 140 is bonded to the first housing 120, and the respective edges of the first housing 120 and the second housing 130 are bonded to each other, so that the first housing 120, the second housing 130 and the web 140 are connected to form the blade 110.

[0124] Fig. 9 Schematically shows the structure of a wind turbine blade manufacturing method. Refer to Fig. 9 As shown, an embodiment of the present application provides a wind turbine blade manufacturing method. The wind turbine blade manufacturing method includes:

[0125] Provide a first housing 120 and a backing plate 150. The inner surface of the first housing 120 has a first bonding surface 120a for bonding with the web 140, and a backing plate 150 is provided on the first bonding surface 120a;

[0126] Lay a release cloth 170 on the backing plate 150, and apply an adhesive 200 on the release cloth 170;

[0127] Provide a second housing 130 and a web 140, and connect the web 140 to the second housing 130;

[0128] The first shell 120 and the second shell 130 are molded together for the first time, the web 140 contacts the adhesive 200 disposed on the release cloth 170, and a first distance is formed between the web 140 and the release cloth 170;

[0129] The adhesive 200 disposed on the release cloth 170 is cured to form a first adhesive layer 210, and the release cloth 170 is connected to the web 140;

[0130] The first shell 120 and the second shell 130 are opened, the release cloth 170 is separated from the backing plate 150, the backing plate 150 is removed, and the adhesive 200 is disposed on the first adhesive surface 120a, and the release cloth 170 connected to the first adhesive layer 210 is removed;

[0131] The first housing 120 and the second housing 130 are molded together for the second time, the first adhesive layer 210 contacts the adhesive 200 disposed on the first adhesive surface 120a, and a second distance exists between the first adhesive layer 210 and the first adhesive surface 120a;

[0132] The adhesive 200 disposed on the first adhesive surface 120 a is cured to form a second adhesive layer 220 , and the first adhesive layer 210 is connected to the first shell 120 .

[0133] In the embodiment of the present application, when the first shell 120 and the second shell 130 are molded for the first time, the web 140 and the composite material plate 160 can squeeze the adhesive 200 set on the demoulding cloth 170 to spread the adhesive 200. There is a first spacing between the web 140 and the demoulding cloth 170. The thickness of the adhesive 200 is equal to the first spacing. The gap between the web 140 and the demoulding cloth 170 can be in an unstable state, so there is no need to strictly control the gap size between the web 140 and the demoulding cloth 170, thereby reducing the adverse effects caused by the processing errors of the first shell 120, the second shell 130 and the web 140.

[0134] After the first shell 120 and the second shell 130 are molded together for the first time, the web 140 and the release cloth 170 are bonded to each other. The adhesive 200 between the web 140 and the release cloth 170 is cured to form a first adhesive layer 210. When the first shell 120 and the second shell 130 are molded together for the second time, the release cloth 170 on the first adhesive layer 210 is removed first. The gap size between the first adhesive layer 210 and the first adhesive surface 120a is the same as the thickness of the removed pad 150, so the gap between the first adhesive layer 210 and the first adhesive surface 120a is in a stable state, so that the gap between the first adhesive layer 210 and the first adhesive surface 120a is not likely to be too large or too small, so that a predetermined amount of adhesive 200 can be accurately set on the first adhesive surface 120a, so as to ensure that the adhesive 200 is not likely to overflow and cause waste under the extrusion of the first adhesive layer 210 and the first shell 120, and is not likely to have a problem of insufficient bonding width, and at the same time avoid the first shell 120 through the first adhesive layer 210 squeezed to the web 140 to cause the web 140 to be crushed. The adhesive 200 set on the first adhesive surface 120a is cured to form the second adhesive layer 220, and the first adhesive layer 210 is bonded to the first shell 120 through the second adhesive layer 220.

[0135] The method for manufacturing a wind turbine blade according to the embodiment of the present application forms a first adhesive layer 210 at one end of the web 140 by using a backing plate 150 and a demoulding cloth 170. The backing plate 150 can prefabricate a stable gap between the first adhesive layer 210 and the first shell 120, so that after the backing plate 150 is removed and the first shell 120 and the second shell 130 are molded for the second time, the gap between the first adhesive layer 210 and the first adhesive surface 120a is in a stable state and meets the gap standard requirements. The gap between the first adhesive layer 210 and the first adhesive surface 120a is not prone to being too large or too small. Therefore, the method for manufacturing a wind turbine blade according to the embodiment of the present application can help ensure the stable production efficiency of the blade 110, and also help ensure the stable quality of the blade 110 itself. In addition, in the manufacturing process of the blade 110, it is no longer necessary to use the method of manually measuring the gap size, which is conducive to improving work efficiency and solving the problem that the gap near the tip of the blade cannot be measured.

[0136] Fig.10 The structure of the wind turbine blade manufacturing method is schematically shown. Fig.10 As shown, the embodiment of the present application provides a method for manufacturing a wind turbine blade. The method for manufacturing a wind turbine blade includes:

[0137] A first shell 120 and a backing plate 150 are provided. The edge of the first shell 120 has a first edge docking surface 122. The backing plate 150 is arranged on the first edge docking surface 122.

[0138] Laying a composite material plate 160 on the backing plate 150 and providing an adhesive 200 on the composite material plate 160;

[0139] Providing a second shell 130, wherein the edge of the second shell 130 has a second edge docking surface 132 for docking with the first edge docking surface 122;

[0140] The first shell 120 and the second shell 130 are molded together for the first time, the second edge butt surface 132 contacts the adhesive 200 disposed on the composite material plate 160, and a first distance exists between the second edge butt surface 132 and the composite material plate 160;

[0141] The adhesive 200 disposed on the composite material plate 160 is cured, and the composite material plate 160 is connected to the second housing 130 ;

[0142] The first shell 120 and the second shell 130 are opened, the composite material plate 160 is separated from the backing plate 150, the backing plate 150 is removed, and the adhesive 200 is disposed on the first edge joint surface 122;

[0143] The first shell 120 and the second shell 130 are molded together for the second time, the composite material plate 160 contacts the adhesive 200 disposed on the first edge butt surface 122, and a second distance exists between the composite material plate 160 and the first edge butt surface 122;

[0144] The adhesive 200 disposed on the first edge joint surface 122 is cured, and the composite material plate 160 is connected to the first shell 120 .

[0145] After the first shell 120 and the second shell 130 complete the first mold closing, the second shell 130 and the composite material plate 160 are bonded to each other. When the first shell 120 and the second shell 130 are molded for the second time, the gap size between the composite material plate 160 and the first edge docking surface 122 is the same as the thickness of the removed pad 150, so the gap between the composite material plate 160 and the first edge docking surface 122 is in a stable state, so that the gap between the composite material plate 160 and the first edge docking surface 122 is not likely to be too large or too small, so that a predetermined amount of adhesive 200 can be accurately set on the first edge docking surface 122, so as to ensure that the adhesive 200 is not likely to overflow and cause waste under the squeezing action of the composite material plate 160 and the first shell 120, and is not likely to have the problem of insufficient bonding width.

[0146] The method for manufacturing a wind turbine blade in the embodiment of the present application uses a backing plate 150 and a composite material plate 160 to connect the second shell 130 with the composite material plate 160 to form an integral structure, and the backing plate 150 can prefabricate a stable gap between the composite material plate 160 and the first shell 120, so that after the backing plate 150 is removed and the first shell 120 and the second shell 130 are molded for the second time, the gap between the composite material plate 160 and the first edge docking surface 122 is in a stable state and meets the gap standard requirements. The gap between the composite material plate 160 and the first edge docking surface 122 is not prone to being too large or too small. Therefore, the method for manufacturing a wind turbine blade in the embodiment of the present application can help ensure the stable production efficiency of the blade 110, and also help ensure the stable quality of the blade 110 itself. In addition, in the manufacturing process of the blade 110, it is no longer necessary to manually measure the gap size, which is conducive to improving work efficiency.

[0147] In some achievable embodiments, the first edge abutment surface 122 and the second edge abutment surface 132 are located at the leading edge or the trailing edge of the blade 110 .

[0148] Fig.11 The structure of the wind turbine blade manufacturing method is schematically shown. Fig.11 As shown, the embodiment of the present application provides a method for manufacturing a wind turbine blade. The method for manufacturing a wind turbine blade includes:

[0149] A first shell 120 and a backing plate 150 are provided. The edge of the first shell 120 has a first edge docking surface 122. The backing plate 150 is arranged on the first edge docking surface 122.

[0150] Lay a release cloth 170 on the backing plate 150 , and set an adhesive 200 on the release cloth 170 ;

[0151] Providing a second shell 130, wherein the edge of the second shell 130 has a second edge docking surface 132 for docking with the first edge docking surface 122;

[0152] The first shell 120 and the second shell 130 are molded together for the first time, the second edge butt surface 132 contacts the adhesive 200 disposed on the release cloth 170, and a first distance is formed between the second edge butt surface 132 and the release cloth 170;

[0153] The adhesive 200 disposed on the release cloth 170 is cured to form a first adhesive layer 210, and the release cloth 170 is connected to the second housing 130;

[0154] The first shell 120 and the second shell 130 are opened, the release cloth 170 is separated from the backing plate 150, the backing plate 150 is removed, and the adhesive 200 is disposed on the first edge joint surface 122, and the release cloth 170 connected to the first adhesive layer 210 is removed;

[0155] The first shell 120 and the second shell 130 are molded together for the second time, the first adhesive layer 210 contacts the adhesive 200 disposed on the first edge butt joint surface 122, and a second distance exists between the first adhesive layer 210 and the first edge butt joint surface 122;

[0156] The adhesive 200 disposed on the first edge mating surface 122 is cured to form a second adhesive layer 220 , and the first adhesive layer 210 is connected to the first shell 120 .

[0157] After the first shell 120 and the second shell 130 are molded together for the first time, the second shell 130 and the release cloth 170 are bonded to each other. The adhesive 200 between the second shell 130 and the release cloth 170 is cured to form a first adhesive layer 210. When the first shell 120 and the second shell 130 are molded together for the second time, the release cloth 170 on the first adhesive layer 210 is removed first. The gap size between the first adhesive layer 210 and the first edge joint surface 122 is the same as the thickness of the removed pad 150, so the gap between the first adhesive layer 210 and the first edge joint surface 122 is in a stable state, so that the gap between the first adhesive layer 210 and the first edge joint surface 122 is not likely to be too large or too small, so that a predetermined amount of adhesive 200 can be accurately set on the first edge joint surface 122, so as to ensure that the adhesive 200 is not likely to overflow and cause waste under the extrusion of the first adhesive layer 210 and the first shell 120, and is not likely to have a problem of insufficient bonding width, and at the same time avoid the first shell 120 being squeezed to the second shell 130 through the first adhesive layer 210, causing the second shell 130 to be crushed. The adhesive 200 set on the first edge joint surface 122 is cured to form the second adhesive layer 220, and the first adhesive layer 210 is bonded to the first shell 120 through the second adhesive layer 220.

[0158] The method for manufacturing a wind turbine blade according to the embodiment of the present application forms a first adhesive layer 210 on the second edge docking surface 132 of the second shell 130 by using a backing plate 150 and a demoulding cloth 170. The backing plate 150 can prefabricate a stable gap between the first adhesive layer 210 and the first shell 120, so that after the backing plate 150 is removed and the first shell 120 and the second shell 130 are molded for the second time, the gap between the first adhesive layer 210 and the first edge docking surface 122 is in a stable state and meets the gap standard requirements. The gap between the first adhesive layer 210 and the first edge docking surface 122 is not prone to being too large or too small. Therefore, the method for manufacturing a wind turbine blade according to the embodiment of the present application can help ensure the stable production efficiency of the blade 110, and also help ensure the stable quality of the blade 110 itself. In addition, in the manufacturing process of the blade 110, it is no longer necessary to manually measure the gap size, which is conducive to improving work efficiency.

[0159] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for manufacturing a wind turbine blade, wherein the wind turbine blade comprises a first shell, a second shell and a web, wherein: The wind turbine blade manufacturing method comprises: Providing a first shell and a backing plate, wherein the inner surface of the first shell has a first bonding surface for bonding with the web, and the backing plate is arranged on the first bonding surface; Laying a composite material plate on the backing plate, and providing an adhesive on the composite material plate; providing a second shell and a web, and connecting the web to the second shell; The first shell and the second shell are molded together for the first time, the web contacts the adhesive disposed on the composite material plate, and a first distance exists between the web and the composite material plate; The adhesive disposed on the composite material plate is cured, and the composite material plate is connected to the web; Opening the molds of the first shell and the second shell, separating the composite material plate from the backing plate, removing the backing plate, and disposing the adhesive on the first bonding surface; The first shell and the second shell are molded together for a second time, the composite material plate contacts the adhesive disposed on the first bonding surface, and a second distance exists between the composite material plate and the first bonding surface; The adhesive disposed on the first bonding surface is cured, and the composite material plate is connected to the first shell.

2. The method for manufacturing a wind turbine blade according to claim 1, characterized in that: The backing plate and the composite material plate are both flexible plates.

3. The method for manufacturing a wind turbine blade according to claim 1, characterized in that: The area of ​​the pad is greater than or equal to the area of ​​the first bonding surface.

4. The method for manufacturing a wind turbine blade according to claim 3, characterized in that: The area of ​​the composite material plate is equal to the area of ​​the first bonding surface.

5. The method for manufacturing a wind turbine blade according to claim 1, characterized in that: The first spacing is smaller than the second spacing.

6. The method for manufacturing a wind turbine blade according to claim 1, characterized in that: The backing plate is bonded to the first bonding surface.

7. The method for manufacturing a wind turbine blade according to claim 1, characterized in that: A release cloth is arranged between the composite material plate and the backing plate.

8. The method for manufacturing a wind turbine blade according to claim 7, characterized in that: The release cloth is disposed on the surface of the composite material plate facing the backing plate, and the release cloth disposed on the composite material plate is removed before the first shell and the second shell are molded together for the second time.

9. The method for manufacturing a wind turbine blade according to claim 1, characterized in that: A release cloth is arranged on the surface of the composite material plate facing away from the backing plate, and the release cloth arranged on the composite material plate is removed before the adhesive is arranged on the composite material plate.

10. The method for manufacturing a wind turbine blade according to claim 1, characterized in that: After the first shell and the second shell are molded, the composite material plate and the adhesive connecting the composite material plate and the web are trimmed.

11. The method for manufacturing a wind turbine blade according to claim 1, characterized in that: The first shell includes a first main beam having the first bonding surface, the second shell includes a second main beam having a second bonding surface, and the web is bonded to the second bonding surface.

12. A method for manufacturing a wind turbine blade, the wind turbine blade comprising a first shell, a second shell and a web, characterized in that: The wind turbine blade manufacturing method comprises: Providing a first shell and a backing plate, wherein the inner surface of the first shell has a first bonding surface for bonding with the web, and the backing plate is arranged on the first bonding surface; Laying a release cloth on the backing plate and providing an adhesive on the release cloth; providing a second shell and a web, and connecting the web to the second shell; The first shell and the second shell are molded together for the first time, the web contacts the adhesive disposed on the release cloth, and a first distance is provided between the web and the release cloth; The adhesive disposed on the release cloth is cured to form a first adhesive layer, and the release cloth is connected to the web; The first shell and the second shell are opened, the release cloth is separated from the backing plate, the backing plate is removed, and the adhesive is provided on the first bonding surface, and the release cloth connected to the first bonding layer is removed; The first shell and the second shell are molded together for a second time, the first adhesive layer contacts the adhesive disposed on the first adhesive surface, and a second distance exists between the first adhesive layer and the first adhesive surface; The adhesive disposed on the first bonding surface is cured to form a second bonding layer, and the first bonding layer is connected to the first shell.

13. A method for manufacturing a wind turbine blade, the wind turbine blade comprising a first shell and a second shell, characterized in that: The wind turbine blade manufacturing method comprises: Providing a first shell and a backing plate, wherein the edge of the first shell has a first edge butt joint surface, and the backing plate is arranged on the first edge butt joint surface; Laying a composite material plate on the backing plate, and providing an adhesive on the composite material plate; Providing a second shell, wherein the edge of the second shell has a second edge abutment surface for abutting the first edge abutment surface; The first shell and the second shell are molded together for the first time, the second edge butt surface contacts the adhesive disposed on the composite material plate, and a first distance exists between the second edge butt surface and the composite material plate; The adhesive disposed on the composite material plate is cured, and the composite material plate is connected to the second shell; Opening the molds of the first shell and the second shell, separating the composite material plate from the backing plate, removing the backing plate, and providing the adhesive on the first edge joint surface; The first shell and the second shell are molded together for a second time, the composite material plate contacts the adhesive disposed on the first edge butt surface, and a second distance exists between the composite material plate and the first edge butt surface; The adhesive disposed on the first edge abutting surface is cured, and the composite material plate is connected to the first shell.

14. A method for manufacturing a wind turbine blade, the wind turbine blade comprising a first shell and a second shell, characterized in that: The wind turbine blade manufacturing method comprises: Providing a first shell and a backing plate, wherein the edge of the first shell has a first edge butt joint surface, and the backing plate is arranged on the first edge butt joint surface; Laying a release cloth on the backing plate and providing an adhesive on the release cloth; Providing a second shell, wherein the edge of the second shell has a second edge abutment surface for abutting the first edge abutment surface; The first shell and the second shell are molded together for the first time, the second edge butt surface contacts the adhesive disposed on the release cloth, and a first distance exists between the second edge butt surface and the release cloth; The adhesive disposed on the release cloth is cured to form a first adhesive layer, and the release cloth is connected to the second shell; The first shell and the second shell are opened, the demoulding cloth is separated from the backing plate, the backing plate is removed, and the adhesive is provided on the first edge joint surface, and the demoulding cloth connected to the first adhesive layer is removed; The first shell and the second shell are molded together for a second time, the first adhesive layer contacts the adhesive disposed on the first edge butt joint surface, and a second distance exists between the first adhesive layer and the first edge butt joint surface; The adhesive disposed on the first edge abutting surface is cured to form a second adhesive layer, and the first adhesive layer is connected to the first shell.

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