WO2021018149A1 - Blade forming method and blade - Google Patents

Abstract

The present application discloses a blade forming method, and a blade. The blade forming method comprises: a blade housing forming step, using a blade housing forming mold to form a housing, and at least one of a windward side housing forming mold and a leeward side housing forming mold comprises multiple first identification portions spaced apart from each other; a web preparation step, wherein a web comprises multiple first identifiers; a web assembly step, using a web fixture to assemble the web, the web fixture comprising a pressurizing fixture, and the web being connected to the pressurizing fixture; a web installation step, installing the pressurizing fixture and the web, as a whole, at one of the windward side housing forming mold and the leeward side housing forming mold; and a housing mold combination step, combining the windward side housing forming mold and the leeward side housing forming mold so as to form a blade. The blade forming fixture, the blade forming method, and the blade provided by the present application improve the efficiency of blade forming.

Description

Blade forming method and blade

Cross references to related applications

This application claims the priority of the Chinese patent application named "Blade Forming Method and Blade" and the application number is 201910687461.3 filed on July 29, 2019. The entire content of this application is incorporated herein by reference.

Technical field

This application relates to the field of wind power technology, and in particular to a blade forming method and a blade.

Background technique

With the continuous development of wind power technology, it is a development trend in the industry to provide more stable and more powerful wind turbines. On the one hand, high-power wind turbines will make the blades longer and longer. The wind turbine blade is mainly composed of a shell and a web. The shell is composed of two half shells, namely the windward side shell and the leeward side shell. The hollow space between the two half shells is in the extending direction of the blade Supported by the web. In the manufacture of blades, people always strive to manufacture blades in a stable and efficient manner.

Usually, the web and the shell are connected by means of trial clamping, that is, before the web and the shell are connected, a step of testing the assembly gap of each component before bonding is performed. However, due to the large size of wind turbine blade components, it is necessary to place flexible cement at the bonding position, and determine the assembly gap based on the thickness of the deformed cement. If there is a problem, the corresponding components need to be adjusted in time. In this way, it is necessary to repeatedly adjust the position or gap between the web and the main beam according to the degree of deformation of the flexible cement, which consumes a lot of time, manpower and material resources.

Therefore, there is an urgent need for a new blade forming method and blade.

Summary of the invention

The embodiments of the present application provide a blade forming method and blade, aiming at improving the forming efficiency of the blade.

On the one hand, according to an embodiment of the present application, a blade molding method is provided, which includes the following steps: a blade shell forming step, using a blade shell forming mold to form the shell, the blade shell forming mold includes a windward surface shell molding mold and a leeward surface shell molding mold The blade shell molding step includes the windward side shell molding step and the leeward side shell molding step. The windward side shell is formed in the windward side shell molding mold, and the leeward side shell is formed in the leeward side shell molding mold. At least one of the shell forming mold and the leeward surface shell forming mold includes a plurality of first identification parts spaced apart from each other, and the plurality of first identification parts are arranged along the long axis direction of the blade shell forming mold; and the step of providing a web The web includes a plurality of first markers, the first markers are arranged on the surface of the web near the leading edge region or the trailing edge region of the blade, and at least part of the first markers have a predetermined corresponding relationship with the first identification portion; In the plate assembly step, use the web tooling to assemble the web. The web tooling includes a press tool to connect the web with the press tool; the web installation step is to install the press tool and the web as a whole to the windward shell For one of the body forming mold and the leeward side shell forming mold, at least part of the first identifier and the first identification part meet the predetermined corresponding relationship; the shell clamping step is to match the windward side shell forming mold and the leeward side shell forming mold Clamp the mold to form the blade.

According to an embodiment of an aspect of the present application, the blade shell forming mold includes a first matching portion corresponding to and adapted to the web tooling. The blade shell forming mold is assembled with the web tooling through the first matching portion, so that at least part of the first The marker and the first identification part satisfy a predetermined corresponding relationship.

According to one of the foregoing embodiments of the present application, the web tooling further includes a web assembly bracket, and the web assembly step includes: providing a web assembly bracket; placing the web on the web assembly bracket; placing the web on the web assembly The web on the bracket is connected with the pressurizing tool.

According to any one of the foregoing embodiments in one aspect of the present application, the web assembly step is used to make the first distance between the first marker of the web and the reference plane in the width direction of the web meet the preset distance, and after the web assembly step It also includes the step of determining that the first distance satisfies the preset distance: according to the first marker, using a detection tool to determine the first distance between the first marker of the web and the reference plane along the width direction of the web; A difference between a distance and a preset distance determines the relationship between the first distance and the preset distance; if the difference is within the preset range, it is determined that the first distance meets the preset distance.

According to any one of the foregoing embodiments of one aspect of the present application, the web tooling includes a support surface, and in the width direction of the web, the sum of the distance between the support surface and the reference surface and the distance between the first marker and the support surface Satisfy the preset distance; optionally, the reference plane is one of the ground, the inner surface of the windward shell and the inner surface of the leeward shell.

According to any one of the foregoing embodiments of the present application, the step of forming the windward side shell includes: providing a main beam, the surface of the main beam along its thickness direction is provided with a plurality of second markers arranged at intervals, and the plurality of second markers The main beams are arranged in the length direction; the windward side shell molding die is provided, and the windward side shell molding die includes a first containing cavity and a plurality of first identification portions, at least part of the first identification portion and the second identifier have predetermined Correspondence; the windward side shell is formed, the main beam is arranged in the first receiving cavity, and the first identification part and the second marker meet a predetermined corresponding relationship, and the windward side shell is formed by skin layering on the main beam.

According to any one of the foregoing embodiments of the present application, the step of forming the leeward surface shell includes: providing a main beam, the surface of the main beam along its thickness direction is provided with a plurality of second markers arranged at intervals, and the plurality of second markers The main beams are arranged in the length direction; a leeward surface shell molding mold is provided. The leeward surface shell molding mold includes a second accommodating cavity and a plurality of first identification parts. At least part of the first identification part and the second identifier have predetermined Correspondence; the leeward surface shell is formed, the main beam is arranged in the second containing cavity, and the first identification part and the second marker meet a predetermined corresponding relationship, and the leeward surface shell is formed by skin layering on the main beam.

According to any one of the foregoing embodiments in one aspect of the present application, after the main beam is provided, a main beam verification step is included. The main beam verification step includes: selecting a plurality of measurement areas along the width direction of the main beam; Thickness, multiple thickness values are obtained; according to the difference between the thickness value and the thickness standard value, it is determined whether the main beam is qualified.

According to one of the foregoing embodiments of the present application, the web assembling step is used to make the first distance between the first marker of the web and the reference plane in the width direction of the web meet the preset distance, according to the thickness value and the thickness The difference of the standard value adjusts the preset distance.

According to any one of the foregoing embodiments of the present application, the web installation step includes: marking the bonding line of the web in the windward side shell, the bonding line being the edge line of the web; the web tooling and the web assembly as a whole Install to the windward side shell molding die, and apply adhesive glue to the bonding line to connect the web and the windward side shell.

According to any one of the foregoing embodiments of the present application, the web installation step includes: marking the bonding line of the web in the leeward surface shell, the bonding line being the edge line of the web; the web tooling and the web assembly as a whole Install to the leeward side shell molding die, and apply adhesive glue at the bonding line to connect the web and the leeward side shell.

On the other hand, according to an embodiment of the present application, a blade is provided, including: a shell, including a windward surface shell and a leeward surface shell disposed oppositely, the windward surface shell and the leeward surface shell buckle to form a hollow space, and the shell Comprising a plurality of second markers, the second markers are arranged along the long axis direction of the shell; the web includes a plurality of first markers, at least part of the first markers are arranged in a row along the extending direction of the web, At least part of the first marker and the second marker satisfy a predetermined corresponding relationship, the web is arranged in the hollow space, and the web is respectively connected with the windward side shell and the leeward side shell.

According to another embodiment of the present application, the windward side shell and the leeward side shell include main beams, at least one of the main beams includes a plurality of second markers arranged at intervals, and the plurality of second markers extend along the main beam Arranged in the length direction.

The blade molding method and the blade provided by the embodiments of the present application. The blade molding method is to provide a plurality of first identification portions on one of the windward surface shell molding mold and the leeward surface shell molding mold, so that the first identification portion and the use of the mold The relative position of the formed windward side shell or the leeward side shell is accurate, by having the first marker on the web, by accurately fixing the web in the web tooling, and then passing the web tooling and the windward side shell One of the forming mold and the leeward side shell forming mold is accurately connected to realize the accurate connection between the web assembly and one of the windward side shell and the leeward side shell, thereby quickly bonding the web in the shell In order to avoid the trial and closing process during the blade forming process and improve the blade forming efficiency.

Description of the drawings

The following will briefly introduce the drawings that need to be used in the embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

FIG. 1 is a schematic diagram of the overall structure of a windward side shell forming mold and a leeward side shell forming mold provided by an embodiment of the present application;

2 is a schematic diagram of the overall structure of a web forming mold provided by an embodiment of the present application;

FIG. 3 is a schematic structural diagram of using a detection tool to measure the distance between the web and the windward side shell in the blade forming tool provided by an embodiment of the present application;

4 is a flowchart of a blade forming method provided by an embodiment of the present application;

5 is a schematic structural diagram of the use state of the second axial positioning tool and the second chordwise positioning tool in the blade forming method provided by an embodiment of the present application;

6 is a schematic structural diagram of the use state of the third axial positioning tool and the third chordwise positioning tool in the blade forming method provided by an embodiment of the present application;

FIG. 7 is a schematic structural diagram of the integrated assembly of the web component and the web tooling of the blade forming method provided by an embodiment of the present application;

FIG. 8 is a schematic structural diagram of a main beam provided by an embodiment of the present application;

Figure 9 is a schematic structural diagram of a web provided by an embodiment of the present application;

Fig. 10 is a schematic structural diagram of a blade provided by an embodiment of the present application.

Detailed ways

The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the following detailed description, many specific details are proposed in order to provide a comprehensive understanding of this application. The following description of the embodiments is only to provide a better understanding of the present application by showing examples of the present application. In the drawings and the following description, at least part of the well-known structures and technologies are not shown in order to avoid unnecessary obscurity of the application; and, for clarity, the size of some structures may be exaggerated. In addition, the features, structures or characteristics described below may be combined in one or more embodiments in any suitable manner.

In order to better understand the present application, the blade forming tool, blade forming method and blade of the embodiments of the present application will be described in detail below with reference to FIGS. 1 to 10.

Please refer to FIGS. 1 to 3 and 5 to 9 together. FIG. 1 is a schematic diagram of the overall structure of a windward side shell forming mold and a leeward side shell forming mold provided by an embodiment of the present application. The overall structure diagram of the web forming mold provided in the embodiment. FIG. 3 is a schematic diagram of the structure of measuring the distance between the web and the windward surface shell in the blade forming tool provided by an embodiment of the application. A structural schematic diagram of the use state of the second axial positioning tool and the second chordwise positioning tool in the blade forming method provided by one embodiment of the application. FIG. 6 is the third axial positioning tool in the blade forming method provided by an embodiment of the application And the third chord-direction positioning tool in the use state of the structure diagram, FIG. 7 is a structural schematic diagram of the web assembly and the web tool assembly of the blade forming method provided by an embodiment of the present application, and FIG. 8 is an embodiment of the present application A schematic structural diagram of the main beam is provided. FIG. 9 is a schematic structural diagram of a web provided in an embodiment of the present application.

The embodiment of the present application provides a blade forming tool, which includes a blade shell forming mold and a web tooling 5.

The blade shell molding mold includes a windward surface shell molding mold 1 and a leeward surface shell molding mold 2. At least one of the windward surface shell molding mold 1 and the leeward surface shell molding mold 2 includes a plurality of first spaced apart. The identification portion 11, a plurality of first identification portions 11 are arranged along the long axis direction X of the blade shell molding die. Optionally, the first identification portion 11 is arranged at an edge position of the blade shell molding die. The web tooling 5 is used to assemble the web 7, and the web 7 includes a plurality of first markers 71. The first markers 71 are provided on the surface of the web 7 facing the leading edge region 63 or the trailing edge region 64 of the blade. At least part of the first marker 71 has a predetermined corresponding relationship with the first identification portion 11.

In some optional embodiments, the web tooling 5 includes a compression tool and a web assembly bracket, and the web assembly bracket can be detachably connected to the compression tool. In specific implementation, the web assembly bracket is used to support the web 7, and the compression tool can be moved relative to the web assembly bracket to assemble the web 7 so that the compression tool and the web 7 are connected together . Wherein, the blade shell forming mold includes a first matching part corresponding to and adapted to the web tooling 5. For example, the blade shell forming mold includes a first matching part corresponding to and adapted to the pressing tool, and the first matching part enables The blade shell forming mold is assembled with the web tooling 5 so that at least part of the first marker 71 and the first identification portion 11 meet a predetermined corresponding relationship. In specific implementation, the first matching portion may be a bracket, which can be used to support the web tooling 5, and the web tooling 5 is supported by the first matching portion, so that the web tooling 5 can adjust the web 7 and then At least part of the first marker 71 and the first identification portion 11 satisfy a predetermined corresponding relationship.

Referring to FIG. 7, in some optional embodiments, the web tooling 5 includes a supporting surface 51. Optionally, the web assembly bracket includes a supporting surface 51 for placing the web 7. The support surface 51 is provided on the web assembly bracket, and the support surface 51 is matched with the inner surface of the windward side shell 61 or the inner surface of the leeward side shell 62, so that the web 7 can be accurately placed on the web When assembling the bracket, the accuracy of the connection between the web 7 and the windward side shell 61 or the leeward side shell 62 is also improved.

In order to make the web 7 and the pressurization tooling stable connection, the pressurization tool includes a suction cup, through which the web 7 can be connected to the pressurization tool. When the web 7 needs to be installed on the windward side shell 61 or the leeward side shell When 62 is up, the web 7 is separated from the pressurized tooling by controlling the suction cup.

Among them, the web tooling 5 may also include any or a combination of tools for positioning, transporting, and supporting the web 7. For example, the web tooling 5 may also include internal support tooling. When the web tooling 5 pairs When assembling the web 7 used, the chord distance between the two webs 7 can be adjusted through the inner support tooling. The inner support tooling can be set on the web assembly bracket to facilitate the assembly of the web. The web 7 on the bracket performs chord positioning. The web 7 may include a web main body 72 and a connecting flange 73 that are connected to each other. The web 7 is connected to the windward side shell 61 and the leeward side shell 62 through the connecting flange 73.

The blade forming tool provided by the embodiment of the present application is provided with a first identification portion 11 on at least one of the windward side shell forming mold 1 and the leeward side shell forming mold 2, and the web 7 has a first identifier 71. At least part of the first marker 71 has a predetermined corresponding relationship with the first identifier portion 11. By aligning the first marker 71 with the first identifier portion 11, it is convenient to make the web 7 and the windward side shell molding die 1 Or the accurate positioning of the leeward surface shell molding die 2. At the same time, the web 7 is assembled through the web tooling 5. The web tooling 5 includes a pressurizing tool. After the web 7 is assembled, the web 7 and the The press tooling is connected together, and then the web tooling 5 and the windward side shell molding die 1 or the leeward side shell molding die 2 are positioned or supported to realize the web assembly and the windward side shell 61 or the leeward side shell 62 The relative position between the web 7 and the windward side shell forming mold 1 or the leeward side shell forming mold 2 can be adjusted by the web tooling 5, such as pressurizing tooling, to realize the web 7 and the blade shell The accurate positioning between the web 7 and the windward side shell 61 and the leeward side shell 62 and the assembly gap can ensure the axial position and assembly clearance of the web 7 and the windward side shell 61 or the leeward side shell 62. During the bonding process, the trial and closing process of the mold effectively improves the molding efficiency of the blade.

Wherein, the web tooling 5 can be used to assemble a single web 7 and connect the single web 7 to at least one of the windward side shell forming mold 1 and the leeward side shell forming mold 2. The web tooling 5 can be used to assemble the webs 7 used in pairs to form a web assembly, and then connect the web assembly to the windward side shell forming mold 1 or the leeward side shell forming mold 2. In the following description, the web tooling 5 assembles the webs 7 used in pairs to form a web assembly as an example.

Referring to Figure 2, in some alternative embodiments, the blade forming tooling further includes web forming molds 3a, 3b and a first axial positioning tool 4, and the web forming molds 3a, 3b include a positioning mark portion 31, a positioning mark The portion 31 includes a plurality of second identification portions 311 spaced apart from each other. The second identification portions 311 are arranged on the surfaces of the web forming molds 3a, 3b. At least part of the second identification portions 311 are used to form the first identifier 71, wherein, at least Part of the second identification portion 311 has a predetermined corresponding relationship with the first identification portion 11. The first axial positioning tool 4 is provided on the web forming molds 3a, 3b, and is used to form a positioning portion on the web 7 formed by the web forming molds 3a, 3b. The web tooling 5 includes a connecting part adapted to the positioning part. Optionally, the web assembly bracket includes a connecting part adapted to the positioning part, so that the web 7 can be accurately placed on the web assembly bracket. The web forming molds 3a, 3b are provided with a second identification portion 311, which enables the web 7 manufactured and formed by the web forming molds 3a, 3b to have a first identifier 71, and at least part of the second identification portion 311 is connected to the first The marking portion 11 has a predetermined corresponding relationship, so that the first marking 71 and the first marking portion 11 have a predetermined corresponding relationship. By aligning the first marking 71 with the first marking portion 11, it is convenient to make the web 7 and the windward Accurate positioning of the face shell forming mold 1 or the leeward face shell forming mold 2, and at the same time, the blade forming tool is positioned by the first axial positioning tool 4, so that the web 7 and the web tool 5 can be connected through the positioning portion The parts cooperate to realize the precise positioning of the web 7 on the web tooling 5.

In some optional embodiments, at least part of the second identification portion 311 and the first identification portion 11 have a predetermined correspondence relationship such that the separation distance between at least part of the second identification portion 311 and the first identification portion 11 is equal, or At least part of the second identification portion 311 and the first identification portion 11 can be aligned with each other in the long axis direction X of the blade, and have a one-to-one correspondence relationship. When the web assembly is connected to one of the windward surface shell 61 and the leeward surface shell 62, the second identification portion 311 and the first identification portion 11 can be aligned one by one to realize the web assembly on the blade shell 6 Accurate positioning on the upper side, at the same time, it is also convenient for operators to judge and verify. It can be understood that the predetermined corresponding relationship between the second identification portion 311 and the first identification portion 11 may also be that in the direction X of the long axis of the blade, the second identification portion 311 is placed on two adjacent first identification portions. Between the portions 11, for example, the second identification portion 311 may be placed in an intermediate position between two adjacent first identification portions 11.

In some optional embodiments, the web forming molds 3a, 3b include a web body forming part, and the web body forming part includes a receiving space for placing the web material in the receiving space to form the web 7 , The positioning mark portion 31 is provided on the web main body forming part, the second identification portion 311 is provided on the opposite surface in the thickness direction of the web main body forming part, and at least part of the second identification part 311 is arranged in the extending direction of the web 7 main body forming part. Arranged in a row, at least part of the second marking portion 311 can form the first marking 71 on the web 7. By arranging a reasonable second identification portion 311 on the web forming molds 3a, 3b, the web 7 formed by the web forming molds 3a, 3b includes the first marker 71, and the web can be obtained through the first marker 71 The distance between the plate main body and at least one of the windward side shell 61 and the leeward side shell 62 in the width direction N facilitates the quick and accurate setting of the web 7 through the first marker 71 during the bonding process of the web 7 The bonding position in the windward side shell 61 and the leeward side shell 62 avoids the process of mold closing and improves the molding efficiency of the blade and the quality of the blade.

Optionally, the first axial positioning tool 4 may be an axial starting point positioning tool. The first axial positioning tool 4 includes a positioning plate 121. In specific implementation, the positioning plate 121 is placed on the web forming molds 3a, 3b. Place the forming material of the web 7 in the containing space of the web forming molds 3a, 3b, and cover the forming material on the axial starting point positioning tool, so that after the web 7 is vacuum infused and molded, the web 7 The position where the plate 7 and the positioning plate 121 overlap form a positioning portion, and the web 7 can be accurately positioned with the web tooling 5 through the positioning portion.

In some optional embodiments, the windward side shell molding mold 1 and the leeward side shell molding mold 2 each include first identification portions 11 spaced apart from each other, the windward side shell molding mold 1 and the leeward side shell molding mold One of 2 includes a second mating part corresponding and adapted to the other. The second matching portion can realize the accurate positioning of the windward side shell molding die 1 and the leeward side shell molding die 2 to finally realize the accurate positioning of the windward side shell 61 and the leeward side shell 62, which reduces the windward side The mold clamping process of the shell 61 and the leeward surface shell 62 in the mold clamping process improves the efficiency of the blade mold clamping, thereby improving the molding efficiency of the blade. Optionally, the windward side shell molding mold 1 includes at least two protruding positioning blocks, and the leeward side shell molding mold 2 includes a second matching portion that matches the protruding positioning block as a matching hole. The positioning block and the matching hole cooperate with each other to realize the accurate positioning of the windward side shell forming mold 1 and the leeward side shell forming mold 2. It is understandable that the second matching part can be set according to the needs of the user, which is not limited in this application.

5 and 8, the windward side shell molding mold 1 is used to lay the main beam 66 with a skin 68 to form the windward side shell 61. In order to accurately place the main beam 66 in the windward side shell molding mold 1, In some optional embodiments, the main beam 66 includes second markers 661 corresponding to the first identification portion 11 one-to-one, and the windward side shell molding mold 1 includes a second axial positioning tool 12 and a second chord direction. The positioning tool 13, the second axial positioning tool 12 is used to position the main beam 66 in the long axis direction X position of the windward side shell 61, and the second chord direction positioning tool 13 is used to position the main beam 66 on the windward side shell 61 Chord direction Y position; and/or, the leeward surface shell forming mold 2 is used to form the main beam 66 skin 68 into the leeward surface shell 62, in order to accurately place the main beam 66 in the leeward surface shell forming mold 2, The main beam 66 includes a second marker 661 corresponding to the first identification portion 11 one-to-one. The leeward surface shell molding die 2 includes a third axial positioning tool 21 and a third chord positioning tool 22. The third axial positioning The tool 21 is used to position the main beam 66 in the long axis direction X position of the leeward surface shell 62, and the third chord direction positioning tool 22 is used to position the main beam 66 in the chord direction Y position of the leeward surface shell 62.

In specific implementation, the second axial positioning tool 12 and the third axial positioning tool 21 may be similar in structure to the first axial positioning tool 4, and both include a positioning plate 121. In the long axis direction X, the positioning plate 121 It is in abutting contact with one end of the main beam 66 to accurately position the position of the main beam 66 in the long axis direction X on the windward side shell forming mold 1 or the leeward side shell forming mold 2. Optionally, the second chord-direction positioning tool 13 and the third chord-direction positioning tool 22 have similar structures, and both include a positioning member 131. The positioning member 131 is in abutting contact with the other end of the main beam 66 so as to Accurate positioning is performed on the chord position on the windward side shell molding die 1 or the leeward side shell molding die 2. By accurately setting the main beam 66 in the windward side shell molding mold 1 or the leeward side shell molding mold 2, the windward side shell 61 produced by the windward side shell molding mold 1 or the leeward side shell molding mold 2 Or the position of the main beam 66 in the leeward side shell 62 is accurate, so that when the windward side shell forming mold 1 or the leeward side shell forming mold 2 is accurately aligned with the web tooling 5, the windward side shell 61 and One of the leeward surface shells 62 is accurately aligned with the web 7.

3, in some alternative embodiments, the blade forming tooling further includes a detection tool 8, which is used to detect the distance between the first marker 71 and the reference surface in the width direction N; optionally, the reference The surface is one of the ground, the inner surface of the windward side shell 61 and the inner surface of the leeward side shell 62. When the web tooling 5 assembles the web 7 to form a web assembly, and when the web assembly is installed on one of the windward side shell 61 and the leeward side shell 62, the first marker 71 can be detected by the inspection tool 8 The distance from the reference surface along the width direction N, that is, the distance between the first marker 71 and the reference surface along the width direction N of the web 7 is detected, which facilitates real-time verification of the blade forming process and improves the blade forming performance Accuracy.

Please also refer to FIG. 4. FIG. 4 is a flowchart of a blade forming method according to an embodiment of the present application.

The embodiment of the present application also provides a blade forming method, using the above blade forming tool, including the following steps:

S110, the blade shell forming step, the blade shell forming mold is used to form the shell, the blade shell forming mold includes a windward surface shell forming mold and a leeward surface shell forming mold, and the blade shell forming step includes a windward surface shell forming step and a leeward surface shell In the forming step, the windward side shell is formed in the windward side shell molding mold, the leeward side shell is formed in the leeward side shell molding mold, and at least one of the windward side shell molding mold and the leeward side shell molding mold includes A plurality of first identification parts are spaced apart from each other, and the plurality of first identification parts are arranged along the long axis direction of the blade shell molding die.

S120. The step of providing a web, the web includes a plurality of first markers, the first markers are arranged on the surface of the web near the leading edge region or the trailing edge region of the blade, and at least part of the first markers and the first identification portion have The predetermined correspondence.

S130, the web assembling step, the web is assembled using the web tooling, the web tooling includes a pressurizing tool, and the web is connected to the pressurizing tool.

S140, the web installation step, install the pressurizing tooling and the web as a whole to one of the windward side shell forming mold and the leeward side shell forming mold, and at least part of the first identifier and the first identification portion meet the predetermined correspondence relationship.

S150, the housing mold clamping step, clamping the windward side shell molding mold and the leeward side shell molding mold to form the blade.

The blade molding method provided by the embodiments of the present application uses the above-mentioned blade molding tool to form a blade, and by providing a plurality of first identification portions 11 on one of the windward side shell molding die 1 and the leeward side shell molding die 2 so that the first The relative position of the identification portion 11 and the windward surface shell 61 or the leeward surface shell 62 formed by the mold is accurate. By having the first marker 71 on the web 7, the web 7 is accurately fixed to the web tooling 5. Then, the web tooling 5 is accurately connected to one of the windward side shell forming mold 1 and the leeward side shell forming mold 2, so as to realize one of the web and the windward side shell 61 and the leeward side shell 62 Therefore, the web 7 is quickly bonded to the shell 6 to avoid the trial and closing process during the blade forming process and improve the forming efficiency of the blade.

In some optional embodiments, the blade shell forming mold includes a first matching part corresponding to and adapted to the web tooling 5, and the blade shell forming mold is assembled with the web tooling 5 through the first matching part, so that at least part of the The first marker 71 and the first identification portion 11 satisfy a predetermined corresponding relationship. In specific implementation, the blade shell molding die includes a first matching part corresponding and adapted to the pressurizing tooling. The first matching part may be a bracket. The pressurizing tooling is supported by the first matching, so that the pressurizing tooling The board 7 is adjusted so that at least part of the first marker 71 and the first identification portion 11 meet a predetermined corresponding relationship. By providing a first matching part corresponding to and adapted to the web tooling 5 on the blade shell molding die, such as the windward side shell molding die 1, the web tooling 5 and the web 7 can be formed integrally with the windward side shell The positioning of the mold 1 is accurate, which improves the assembly efficiency of the two. Of course, a first matching portion corresponding and adapted to the web tooling 5 can also be provided on the leeward surface shell molding die 2.

Please refer to FIGS. 5 to 9 together. Specifically, in some alternative embodiments, in step S110, the step of forming the windward side shell includes: providing a main beam 66, and how many surfaces of the main beam 66 along the thickness direction are provided A plurality of second markers 661 are arranged at intervals, and a plurality of second markers 661 are arranged along the long axis direction X of the main beam 66; a windward side shell forming mold 1 is provided, and the windward side shell forming mold 1 includes a first receiving space The cavity and the plurality of first identification portions 11 provided on the inner surface of the first containing cavity, at least part of the first identification portion 11 and the second identifier 661 have a predetermined corresponding relationship; the windward side shell 61 is formed, and the main beam 66 It is arranged in the first accommodating cavity, so that the first identification portion 11 and the second identifier 661 meet a predetermined corresponding relationship, and a skin 68 is laid on the main beam 66 to form a windward shell 61.

In some embodiments, the step of forming the leeward surface shell 62 includes: providing a main beam 66, the surface of the main beam 66 in the thickness direction is provided with a plurality of second markers 661 arranged at intervals, and the plurality of second markers 661 are arranged along the main beam. The beams 66 are arranged in the length direction; the leeward surface shell molding mold 2 is provided. The leeward surface shell molding mold 2 includes a second containing cavity and a plurality of first identification portions 11, at least part of the first identification portion 11 and the second mark The symbol 661 has a predetermined corresponding relationship; the leeward surface shell 62 is formed, the main beam 66 is arranged in the second receiving cavity, and the first identification portion 11 and the second marker 661 meet the predetermined corresponding relationship. The upper skin 68 is layered to form the leeward shell 62.

By providing a plurality of second markers 661 on the main beam 66, the first identification portion 11 is provided in one of the windward side shell molding mold 1 and the leeward side shell molding mold 2. In the molding step of the housing 6, The second marker 661 satisfies the predetermined corresponding relationship with the first identifier portion 11, for example, the second marker 661 corresponds to the first identifier portion 11 one-to-one, so that the main beam 66 can be accurately set on the windward side shell molding die 1 and one of the leeward side shell molding mold 2, thereby making the position of the main beam 66 in the windward side shell 61 or the leeward side shell 62 accurate. When in the windward side shell 61 or the leeward side shell 62, the web assembly and the main beam can be realized by accurately aligning the web tooling 5 and the windward side shell forming mold 1 or the leeward side shell forming mold 2 66 accurate alignment. It can be understood that the steps of placing the main beam 66 in the windward side shell molding mold 1 and the leeward side shell molding mold 2 are similar. The following takes the main beam 66 on the windward side shell molding mold 1 as an example for description. .

Optionally, in order to further ensure the accuracy of the structure of the windward side shell 61, after the main beam 66 is placed on the windward side shell molding die 1, the trailing edge beam can also be placed in the receiving cavity of the windward side shell molding die 1. Inside, place the axial positioning tooling and chord positioning tooling of the trailing edge beam to make the trailing edge beam close to the positioning tooling to ensure that the trailing edge beam is positioned correctly, and vacuum infusion is formed after the layering of the windward side shell forming mold 1 is completed. Skin 68.

In some alternative embodiments, a line drawing tool or a pallet is placed on the windward side shell molding die 1, and the line drawing tool is used to draw a positioning line on the windward side shell 61, or the pallet is placed on the windward side shell 61 Place the auxiliary parts at the corresponding position of the positioning line or close to the card board to realize the precise positioning of the auxiliary parts. Among them, the auxiliary parts can be lightning protection metal parts, counterweight boxes, bonding angles and mold clamping. For parts such as PVC (Polyvinyl chloride), by bonding auxiliary parts to the windward side shell 61, the stability of the blade can be effectively improved.

In some optional embodiments, S110, before the step of forming the blade shell, further includes a step of forming the main beam 66. Specifically, using a marker or using a processing tool, a corresponding second marker 661 is formed on the glass fiber of the main beam 66, and at least part of the second marker 661 and the first marker 71 on the web 7 meet the preset correspondence relationship. In the layering stage of the main beam 66, use a water-based marker to draw the second marker 661, the starting line and the end line on the surface of the main beam 66. Optionally, the width of the second marker 661 is the same as the width of the main beam 66 , And then finally go through the demolding process to form the main beam 66. Optionally, after the main beam 66 is formed, the excess part of the axial length of the main beam 66 can be cut and cleaned according to the starting line and the end line of the product, until the actual length of the main beam 66 after forming is consistent with the theoretical length.

Optionally, after the main beam 66 is provided, a main beam 66 verification step is included. The main beam 66 verification step includes: selecting a plurality of measurement areas 662 along the width direction N of the main beam 66; respectively measuring the main beam 66 in the multiple measurement areas 662 A number of thickness values are obtained; according to the difference between the thickness value and the thickness standard value, it is determined whether the main beam 66 is qualified. Optionally, a plurality of measurement areas 662 are respectively a 25% width position, a 50% width position and a 75% width position of the main beam 66. In the specific implementation, after the main beam 66 product is demolded, the thickness of the main beam 66 corresponding to the 25% width position, 50% width position and 75% width position of the main beam 66 is measured with tools to compare the main beam 66 product Compliance is checked. It is understandable that the position of the measurement area 662 can be set according to the requirements of the user, and four, five or six measurement areas 662 can also be selected to verify the main beam 66.

As an optional embodiment, in S130, in the web assembling step, the web assembling step is used to make the first marker 71 of the web 7 and the reference plane along the width direction N of the web 7 The distance meets the preset distance, and the preset distance is adjusted according to the difference between the thickness value and the thickness standard value. It can be understood that the preset distance may be the theoretical distance between the web 7 and the reference plane along the width direction N of the web 7 during the design process of the web 7 and the blade forming tooling. Due to the influence of machining error or assembly error, the first distance and the preset distance will have a deviation, as long as the deviation meets the design requirements, and the range of the deviation can be set according to the requirements of the user.

In some embodiments, the web assembly is installed on the inner surfaces of the windward side shell 61 and the leeward side shell 62, and is correspondingly bonded to the main beam 66, and the web assembly is installed on the main beam 66. It is necessary to control the assembly distance between the web assembly and the main beam 66 along the width direction N of the web 7. Therefore, in specific implementation, if the actual thickness of the main beam 66 is greater than the theoretical thickness of the main beam 66, it is required Increase the adaptability of the preset distance so that the web components are reasonably and accurately connected to the blade shell 6 to prevent the unreasonable assembly gap from causing excessive pressure on the web 7 during the bonding process of the blade shell, causing windward Damage to the face shell 61 or the leeward face shell 62.

As an alternative embodiment, in S120, before the step of providing the web, it further includes the step of forming the web 7. In the step of forming the web 7 using the web forming molds 3a and 3b, the second identification portion 311 is provided on the web main body. On the opposite surfaces of the forming part in the thickness direction, the separation distance between two adjacent second identification parts 311 satisfies 0.5m≦L≦3m, for example, the separation distance between two adjacent second identification parts 311 is 1m. In specific implementation, the designated positions per meter of the web forming molds 3a, 3b can be, for example, the width of the web main body forming part, and the formed pits, protrusions, holes or identification plates and other special marks visible to the naked eye. During the forming process of the web 7, the web 7 is laid on the surface of the mold using commonly used molding materials such as glass fiber, carbon fiber and core material. After vacuum infusion molding, the web 7 after demolding forms a visible surface on the outer surface of the product The first marker 71, the first marker 71 can be used as the inspection basis for the web assembly process and the web assembly installation process. At this time, it can be measured between the first marker 71 and the reference plane along the width of the web 7 The distance of the direction to realize the inspection of the web assembly process and web assembly installation process. Optionally, after the web 7 is formed, the web 7 can be modified according to the actual needs of the user, so that the size of the web 7 is similar to the theoretical size, and the quality of the blade is improved. It is understandable that after the web forming molds 3a and 3b make the forming web 7, a marking paper or a marking board or the like can be adhered to the surface of the web 7 to form the first marker 71.

Optionally, in S130, in the web assembly step, the web assembly step is used to make the first distance between the first marker 71 of the web 7 and the reference plane along the width direction N of the web 7 meet the preset distance . In some embodiments, the web tooling 5 further includes a web assembly support. At this time, S130, the web assembly step includes: providing a web assembly support; placing the web on the web assembly support; placing the web on the web assembly support The web on the assembly bracket is connected with the pressurizing tool.

In the specific implementation, the repaired web 7 is placed on the supporting surface 51 of the web tooling 5 using lifting tools. For example, the repaired web 7 is placed on the web assembly bracket with lifting tools. On the supporting surface 51, the positioning part of the web 7 is aligned with the connecting part of the web assembly bracket, using internal bracing tooling to support at least two webs 7 for assembly to the theoretical position, and using compression tooling to align the web 7 Perform assembly. The web tooling 5 includes a support surface 51. Optionally, the web assembly bracket includes a support surface 51. In the width direction of the web 7, the distance between the support surface 51 and the reference surface is the same as the first identifier. The sum of the distances between the supporting surfaces 51 meets the preset distance. Optionally, the reference plane is one of the ground, the inner surface of the windward side shell 61 and the inner surface of the leeward side shell 62. By reasonably setting the supporting surface 51, the web 7 can be kept horizontal after being assembled without tilting, which facilitates the installation of the web 7 on the shell 6.

As an optional embodiment, S130, after the web assembling step, further includes: determining that the first distance meets the preset distance: according to the first marker 71, the detection tool 8 is used to determine the first mark of the web 7 The first distance between the symbol 71 and the reference plane along the width direction N of the web 7; the relationship between the first distance and the preset distance is determined according to the difference between the first distance and the preset distance; if the difference is in the preset Set within the range, it is determined that the first distance meets the preset distance. Specifically, if the difference is 3mm and the preset range is [-4mm, 4mm], and the difference at this time is within the preset range, it is determined that the first distance meets the preset distance. It is understandable that the preset range can be set according to the needs of the user.

Please further refer to FIG. 3, after the web 7 assembly step, the result of the web 7 assembly can be verified by determining that the first distance meets the preset distance, and the accuracy of the web 7 assembly can be improved. Optionally, the detection tool 8 may be a web ruler, and the distance and axial position between the first marker 71 and the reference surface (for example, the reference surface may be the ground) are measured by the web rule; the detection tool 8 may also be Laser, at this time, the first marker 71 can be a ring-shaped structure. By irradiating the first marker 71 with a laser, when the projection of the laser on the first marker 71 is in the ring-shaped structure, the web is determined The assembly structure of 7 is reasonable.

In order to quickly install the web 7 and make the position of the first marker 71 on the web 7 accurate after assembly, the web tooling 5 includes a supporting surface 51. In the width direction N along the web 7, the supporting surface 51 The sum of the distance from the reference plane and the distance between the first marker 71 and the supporting surface 51 meets the preset distance, which prevents the web assembly from tilting in the axial direction and improves the accuracy of the connection between the web assembly and the shell , Eliminating the need for trial and clamping process.

In order to accurately install the web assembly in the housing 6, in S140, the web installation step. In some embodiments, the web installation step includes: fixing the web 7 to the windward shell 61 by means of glue; The bonding line of the web 7 is marked in the windward side shell 61, and the bonding line is the edge line of the web 7; the web tooling 5 and the web 7 are fixedly installed to the windward side shell molding die 1 as a whole. Adhesive glue 67 is applied to the line to connect the web 7 and the windward side shell 61.

In some optional embodiments, in order to accurately install the web assembly in the shell 6, S140, the web installation step includes: fixing the web 7 to the leeward side shell 62 by means of glue; on the leeward side shell The bonding line of the web 7 is marked in the body 62, and the bonding line is the edge line of the web 7; the web tooling 5 and the web 7 are fixedly installed as a whole to the leeward side shell forming mold 2, and the bonding line is painted The adhesive tape 67 connects the web 7 and the leeward shell 62.

In the specific implementation, the crane is driven to lift the assembled web 7 and the pressurizing tooling and move it to the windward shell molding die 1, and the pressurizing tool and the windward shell The positioning of the forming mold 1 is accurate, and the web 7 is bonded to the windward side shell 61 through an adhesive 67, and a pressurizing tool is used to give sufficient pressure to the web 7 to ensure that the bonding surface is fully bonded.

After the web installation step, the inspection tool 8 can also be used to verify the distance between the web assembly and the windward shell 61 along the width direction N to confirm that the installation position of the web assembly meets the design requirements. Then, use the web bonding tool to bond the web components. Specifically, turn on the windward side shell forming mold 1 to heat the skin 68 to completely cure the adhesive 67 and then remove the web bonding Tooling and preparation for clamping and bonding. It can be understood that the web bonding tool has a similar structure to the web bonding tool in the prior art, and will not be repeated.

In S150, the shell mold clamping step, the windward side shell molding mold 1 and the leeward side shell molding mold 2 are aligned and connected through the second matching portion, and the shell mold clamping step is performed. Then, tear off the release cloth of the bonding area of the shell 6 and clean it up. Apply adhesive glue to the bonding area of the web 7, the front edge area 63 and the rear edge area 64 of the leeward side shell 62, turn over and lock the mold to complete the mold clamping step of the shell 6. It is understandable that in S150, before the shell is closed, the web tooling 5 can be removed from the blade shell forming mold.

In some optional embodiments, the blade includes a leading edge region 63 and a trailing edge region 64, and after the mold clamping step of the housing 6, a mold clamping verification step is further included. The mold clamping verification step includes: passing the leading edge indicator and/or The trailing edge indicator verifies the housing 6 after the mold is closed. In the specific implementation, turn on the front and rear edge indicators, check the value of the front and rear edge indicators, and confirm that there is no case such as the shell topping or the mold misalignment.

In summary, through the above arrangement, the press tool can be aligned with one of the windward side shell molding die 1 and the leeward side shell molding die 2 to realize the web 7 and the windward side shell 61 and the leeward side. The accurate connection of one of the shells 62, compared with the traditional mold-closing process to adjust the distance and relative position between the windward side shell 61 and the leeward side shell 62, can save the trial and close mold process, and effectively improve The molding efficiency of the blade facilitates more efficient production of the blade.

Please refer to Fig. 10, which shows a schematic structural diagram of a blade according to an embodiment of the present application. The embodiment of the present application also provides a blade, including a shell and a web 7, the shell includes a windward surface shell 61 and a leeward surface shell 62 that are arranged oppositely, and the windward surface shell 61 and the leeward surface shell 62 are buckled together A hollow space 65 is formed, and the housing includes a plurality of second markers 661, and the second markers 661 are arranged along the longitudinal direction X of the housing. The web 7 includes a plurality of first markers 71, at least some of the first markers 71 are arranged in a row along the extending direction of the web 7, and at least some of the first markers 71 and the second markers 661 meet a predetermined corresponding relationship, The web 7 is arranged in the hollow space 65, and the web 7 is connected to the windward side shell 61 and the leeward side shell 62 respectively.

In some alternative embodiments, the windward side shell 61 and the leeward side shell 62 include main beams 66, at least one of the main beams 66 includes a plurality of second markers 661 arranged at intervals, and a plurality of second markers The 661 are arranged in a row along the length direction of the main beam 66. At this time, the length direction of the main beam 66 coincides with the long axis direction X of the shell. By reasonably setting the structure of the main beam 66, the connection position of the outer shell 6 and the web 7 is more accurate.

The embodiment of the present application provides that the blade is made by the above-mentioned blade forming method. By forming the first marker 71 on the web 7 and the second marker 661 on the main beam 66, the connection position of the shell 6 and the web 7 can be made It is more accurate and improves the production efficiency of the blade and the quality of the blade, so it is easy to popularize and apply.

It should be understood that the terms "first", "second", etc., are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply a relationship between these entities or operations. There is any such actual relationship or sequence. It needs to be understood that the terms so used are interchangeable under appropriate circumstances, so that the embodiments in the application described herein, for example, can work or be arranged sequentially in addition to those described herein or described in other ways. .

This application can be implemented in other specific forms without departing from its spirit and essential characteristics. Therefore, the current embodiments are regarded as illustrative rather than restrictive in all aspects, and the scope of this application is defined by the appended claims rather than the foregoing description, and falls within the meaning and equivalents of the claims. All changes within the scope are thus included in the scope of this application. Moreover, different technical features appearing in different embodiments can be combined to achieve beneficial effects. Those skilled in the art should be able to understand and implement other modified embodiments of the disclosed embodiments on the basis of studying the drawings, the description and the claims.

Claims (14)

1. A blade forming method includes:

   In the step of forming the blade shell, the shell is formed using a blade shell forming mold, the blade shell forming mold includes a windward surface shell forming mold and a leeward surface shell forming mold, and the blade shell forming step includes a windward shell forming step and In the step of forming the leeward surface shell, the windward surface shell is formed in the windward surface shell molding mold, the leeward surface shell is formed in the leeward surface shell molding mold, and the windward surface shell is formed At least one of the mold and the leeward shell molding mold includes a plurality of first identification portions spaced apart from each other, and the plurality of first identification portions are arranged along the long axis direction of the blade shell molding mold;

   In the step of providing a web, the web includes a plurality of first markers, and the first markers are arranged on the surface of the web near the leading edge region or the trailing edge region of the blade, and at least part of the first The marker has a predetermined corresponding relationship with the first identification part;

   In the web assembly step, the web is assembled using web tooling, the web tooling includes a pressurizing tool, and the web is connected to the pressurizing tool;

   In the web installation step, the pressurizing tool and the web are mounted as a whole to one of the windward side shell molding die and the leeward side shell molding die, and at least a part of the first identifier and The first identification part satisfies a predetermined corresponding relationship;

   In the shell mold clamping step, the windward surface shell molding mold and the leeward surface shell molding mold are clamped to form a blade.
2. The blade forming method according to claim 1, wherein the blade shell forming mold includes a first matching portion corresponding to and adapted to the web tooling, and the blade shell forming mold is made by the first matching portion Assembling with the web tooling, so that at least part of the first marker and the first identification portion meet a predetermined corresponding relationship.
3. The blade forming method according to claim 1, wherein the web tooling further comprises a web assembling bracket, and the web assembling step comprises:

   Provide web assembly support;

   Placing the web on the web assembly bracket;

   The web placed on the web assembly bracket is connected to the pressurizing tool.
4. The blade forming method according to claim 1, wherein the web assembling step is used to make the first distance between the first marker of the web and the reference plane along the width direction of the web When the preset distance is satisfied, after the web assembling step, the method further includes: determining that the first distance satisfies the preset distance:

   According to the first marker, use a detection tool to determine a first distance between the first marker of the web and the reference plane along the width direction of the web;

   Determine the relationship between the first distance and the preset distance according to the difference between the first distance and the preset distance;

   If the difference is within a preset range, it is determined that the first distance satisfies the preset distance.
5. The blade forming method according to claim 4, wherein the web tooling includes a support surface, and in the width direction of the web, the distance between the support surface and the reference surface is the same as that of the first The sum of the distances between a marker and the supporting surface meets the preset distance.
6. The blade forming method according to claim 5, wherein the reference surface is one of the ground, the inner surface of the windward shell, and the inner surface of the leeward shell.
7. The blade forming method according to claim 1, wherein the step of forming the windward surface shell comprises:

   A main beam is provided, the surface of the main beam along its thickness direction is provided with a plurality of second markers arranged at intervals, and the plurality of second markers are arranged along the length direction of the main beam;

   A windward side shell molding mold is provided, the windward side shell molding mold includes a first accommodating cavity and a plurality of first identification portions, at least part of the first identification portion and the second identifier have a predetermined corresponding relationship ；

   The windward side shell is formed, the main beam is arranged in the first accommodating cavity, and the first identification portion and the second identifier meet a predetermined corresponding relationship, and the main beam is covered with a skin The layer forms the windward side shell.
8. The blade forming method according to claim 1, wherein the step of forming the leeward surface shell comprises:

   A main beam is provided, the surface of the main beam along its thickness direction is provided with a plurality of second markers arranged at intervals, and the plurality of second markers are arranged along the length direction of the main beam;

   A leeward surface shell molding mold is provided, the leeward surface shell molding mold includes a second accommodating cavity and a plurality of first identification parts, at least part of the first identification parts and the second identifiers have a predetermined corresponding relationship ；

   The leeward surface shell is formed, the main beam is arranged in the second accommodating cavity, and the first identification portion and the second marker meet a predetermined corresponding relationship, and the main beam is covered with The layer forms the leeward shell.
9. The blade forming method according to claim 7 or 8, wherein the main beam verification step is included after the main beam is provided, and the main beam verification step includes:

   Selecting multiple measurement areas along the width direction of the main beam;

   Separately measuring the thickness of the main beam in the plurality of measurement areas to obtain a plurality of thickness values;

   According to the difference between the thickness value and the thickness standard value, it is determined whether the main beam is qualified or not.
10. The blade forming method according to claim 9, wherein the web assembling step is used to make the first distance between the first marker of the web and the reference plane along the width direction of the web When the preset distance is satisfied, the preset distance is adjusted according to the difference between the thickness value and the thickness standard value.
11. The blade forming method according to claim 1, wherein the web installation step comprises:

    Mark the bonding line of the web in the windward side shell, the bonding line being the edge line of the web;

    The web tooling and the web assembly are installed as a whole to the windward surface shell molding die, and adhesive glue is applied at the bonding line to connect the web and the windward surface shell.
12. The blade forming method according to claim 1, wherein the web installation step comprises:

    Mark the bonding line of the web in the leeward shell, where the bonding line is the edge line of the web;

    The web tooling and the web assembly are installed as a whole to the leeward surface shell molding die, and adhesive glue is applied at the bonding line to connect the web and the leeward surface shell.
13. A blade, including:

    The casing includes a windward surface casing and a leeward surface casing arranged oppositely, the windward surface casing and the leeward surface casing are buckled to form a hollow space, the casing includes a plurality of second identifiers, the The second markers are arranged along the long axis direction of the casing;

    The web includes a plurality of first markers, at least part of the first markers are arranged in a row along the extending direction of the web, and at least part of the first markers and the second markers meet predetermined Correspondingly, the web is arranged in the hollow space, and the web is connected to the windward side shell and the leeward side shell respectively.
14. The blade according to claim 13, wherein the windward surface shell and the leeward surface shell include main beams, at least one of the main beams includes a plurality of second markers arranged at intervals, and a plurality of the first The two markers are arranged along the length direction of the main beam.

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