Blade guard and method of manufacturing the same

Abstract

The present application relates to a blade guard plate and a manufacturing method thereof, which are used to support a fixing belt wound around a blade. The blade guard plate includes a pad and a support layer. The pad is in the shape of an arc plate. The pad has a first surface and a second surface opposite to each other in the thickness direction of the pad. The first surface can be arranged around a portion of the surface of the blade and cooperate with the blade. The support layer includes a base layer and a reinforcement layer. The base layer is stacked with the pad in the thickness direction and connected to the second surface. The base layer includes a central area and a peripheral area surrounding the central area. The reinforcement layer is arranged on the side of the base layer away from the pad in the thickness direction and covers the central area of ​​the base layer. The reinforcement layer is used to support the fixing belt. The blade guard plate and the manufacturing method thereof in the embodiment of the present application can improve the ability of the blade guard plate to resist bending deformation in the area in direct contact with the fixing belt, and at the same time more effectively disperse the concentrated force of the fixing belt, thereby improving the reliability of blade hoisting.

Description

Technical Field

[0001] The present application relates to the field of wind power technology, and in particular to a blade guard plate and a manufacturing method thereof. Background Art

[0002] The entire process from blade production to installation involves a lot of lifting issues. For example, in the production stage, it is necessary to demould, transport, and stack. However, the load conditions during the blade lifting process are very different from those in service operation. On the basis of meeting the requirements of actual operating conditions, the weak link may exist in the transportation and lifting link.

[0003] At present, the blades are mostly hoisted with fixing belts. To avoid blade damage, the fixing belts cannot directly contact the blades. A blade guard plate needs to be set up, and the blades are hoisted by wrapping the fixing belt around the blade guard plate. However, the area on the blade that is in direct contact with the blade guard plate is also prone to stress concentration, resulting in large local strains, whitening, delamination, bulging, etc. Summary of the invention

[0004] The embodiment of the present application provides a blade guard plate and a method for manufacturing the same, which can improve the ability of the blade guard plate to resist bending deformation in the area in direct contact with the fixing belt, while more effectively dispersing the concentrated force of the fixing belt and improving the reliability of blade lifting.

[0005] On the one hand, according to an embodiment of the present application, a blade guard is proposed, which is used to support a fixing belt wrapped around a blade, and the blade guard includes: a pad, which is in the shape of an arc-shaped plate, and the pad has a first surface and a second surface relative to each other in its own thickness direction, and the first surface can be arranged around a portion of the surface of the blade and cooperate with the blade; a supporting layer, including a base layer and a reinforcing layer, the base layer is stacked with the pad in the thickness direction and connected to the second surface, the base layer includes a central area and a peripheral area surrounding the central area, the reinforcing layer is arranged on the side of the base layer away from the pad in the thickness direction and covers the central area of ​​the base layer, and the reinforcing layer is used to support the fixing belt.

[0006] According to one aspect of the embodiment of the present application, the thickness of the edge of the base layer gradually decreases in a direction away from the central area.

[0007] According to one aspect of the embodiment of the present application, the base layer includes a plurality of first plies stacked in a thickness direction, and the area of ​​each first ply gradually decreases in a direction from the pad to the support layer.

[0008] According to one aspect of an embodiment of the present application, the support layer further includes limiting layers arranged in pairs, which are respectively overlapped on both sides of the reinforcing layer along the first direction and enclosed with the reinforcing layer to form limiting grooves for limiting the fixing belt.

[0009] According to one aspect of an embodiment of the present application, in a first direction, one end of the limiting layer overlaps the reinforcing layer, and the other end overlaps the base layer, and the end of the limiting layer does not exceed the edge of the base layer, so that the orthographic projection of the limiting layer on the pad is within the orthographic projection of the base layer on the pad.

[0010] According to one aspect of the embodiment of the present application, the reinforcement layer includes a plurality of second plies stacked along the thickness direction, and in the direction from the liner to the support layer, the size of each second ply along the first direction gradually increases.

[0011] According to one aspect of the embodiment of the present application, in the direction from the pad to the support layer, the size of each second ply along the second direction gradually decreases, and the second direction is arranged to intersect with the first direction.

[0012] According to one aspect of the embodiment of the present application, the cushion is configured as a foam material layer, or the cushion includes a plurality of hollow columns filled with gas, and each hollow column is arranged side by side on a surface of the support layer facing the blade.

[0013] On the other hand, according to an embodiment of the present application, a method for manufacturing a blade guard plate is provided, comprising: laying a base layer on a partial surface of the blade, the base layer comprising a central area and a peripheral area surrounding the central area; laying a reinforcement layer in the central area of ​​the base layer to form a support layer; curing the support layer and separating the support layer from the surface of the blade; and bonding a pad to a side of the base layer facing away from the reinforcement layer to form a blade guard plate.

[0014] According to one aspect of an embodiment of the present application, the step of laying a base layer on a partial surface of the blade includes: laying multiple first layers layer by layer on the partial surface of the blade to form a base layer, and the area of ​​each first layer gradually decreases in the direction away from the blade, so that the thickness of the edge of the base layer gradually decreases in the direction away from the central area.

[0015] According to one aspect of an embodiment of the present application, after laying the reinforcement layer in the central area of ​​the base layer and before curing the support layer, it also includes: laying limiting layers in pairs on both sides of the reinforcement layer along the first direction, and in the first direction, overlapping one end of the limiting layer with the reinforcement layer and overlapping the other end with the base layer.

[0016] According to one aspect of an embodiment of the present application, the step of laying a reinforcement layer in the central area of ​​the base layer includes: laying multiple second layers layer by layer in the central area of ​​the base layer to form a reinforcement layer, wherein the size of each second layer along the first direction gradually increases in the direction away from the blade, and the size along the second direction gradually decreases, and the second direction is arranged to intersect with the first direction.

[0017] The blade guard provided in the embodiment of the present application is used to support the fixing belt wound around the blade, and includes a pad and a support layer. The pad is in the shape of an arc plate and includes a first surface and a second surface opposite to each other. The first surface is arranged around a part of the surface of the blade and cooperates with the blade to fit the blade, so as to better protect the blade. The support layer includes a base layer and a reinforcement layer. The base layer is arranged on the second surface of the pad and includes a central area and a peripheral area surrounding the central area. The reinforcement layer is arranged on the side of the base layer away from the pad in the thickness direction and covers the central area of ​​the base layer. The reinforcement layer is used to support the fixing belt. That is, by arranging the reinforcement layer in the central area of ​​the base layer, the central area of ​​the blade guard has a higher rigidity, thereby improving the ability of the blade guard to resist bending deformation in the area directly in contact with the fixing belt, avoiding excessive local deformation of the blade guard and damaging the blade, and in the process of lifting, the force of the fixing belt on the reinforcement layer can be more effectively dispersed to the base layer and transmitted to the peripheral area of ​​the base layer, thereby further reducing the local stress concentration phenomenon and improving the reliability of blade lifting. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0019] Figure 1 is a side view of a blade guard provided by an embodiment of the present application;

[0020] Figure 2 is a top view of a blade guard plate ply provided in one embodiment of the present application;

[0021] Figure 3 It is a side view of a support layer provided by an embodiment of the present application laid on the surface of a blade;

[0022] Figure 4 is a schematic diagram of a blade guard plate ply provided in an embodiment of the present application;

[0023] Figure 5 is a side view of a blade guard provided in another embodiment of the present application;

[0024] Figure 6 It is a structural schematic diagram of a hollow column provided by an embodiment of the present application;

[0025] Figure 7 is a cross-sectional view of a local area of ​​a blade guard provided by an embodiment of the present application;

[0026] Figure 8 This is a flow chart of a method for manufacturing a blade guard plate provided in one embodiment of the present application.

[0027] in:

[0028] 1-pad; 11-hollow column; 2-support layer; 21-base layer; 211-first layer; 22-reinforcement layer; 221-second layer; 23-limiting layer; 231-third layer;

[0029] A1-central area; A2-peripheral area; S-limiting groove; Q-filling gas;

[0030] X-first direction; Y-second direction; Z-thickness direction.

[0031] In the drawings, the same reference numerals are used for the same components. The drawings are not drawn to scale. DETAILED DESCRIPTION

[0032] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating examples of the present application. In the accompanying drawings and the following description, at least some of the known structures and technologies are not shown to avoid unnecessary ambiguity in the present 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.

[0033] The directional words appearing in the following description are all directions shown in the figures, and do not limit the blade guard plate and its manufacturing method of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" 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 directly connected or indirectly connected. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0034] During the lifting and transportation of blades, the load situation in local areas is relatively complex, and stress concentration is likely to occur in the areas on the blades that are in direct contact with the blade guards and fixing belts. There are two main existing reinforcement methods. The first is to add reinforcing cloth to the blade surface or add ribs at the lifting position to locally strengthen the blade. The second is to increase the size of the blade guard so that it has a larger contact area with the blade surface, and control the tangential angle of the fixing belt relative to the leading and trailing edges of the blade during the lifting process to avoid the fixing belt tightening the leading and trailing edges of the blade during the lifting process.

[0035] After research, the applicant found that the first reinforcement method will have a greater impact on the weight and cost of the blade, while the second method, although having a smaller impact on the weight of the blade itself, increases the requirements for the use of lifting tools during the lifting process.

[0036] In order to solve the above technical problems, the present application proposes a blade guard plate and a manufacturing method thereof, which realizes a variable stiffness design of the blade guard plate along each area of ​​its own cross section by adjusting the laying method of the blade guard plate, thereby reducing the weight and cost impact on the blade while ensuring the reliability of blade hoisting. In order to better understand the present application, the blade guard plate and the manufacturing method thereof according to the embodiment of the present application are described in detail below in conjunction with the accompanying drawings.

[0037] See also Figure 1 and Figure 2 According to an embodiment of the present application, a blade guard plate is proposed for supporting a fixing belt wrapped around a blade. The blade guard plate includes a pad 1 and a support layer 2. The pad 1 is in the shape of an arc plate. The pad 1 has a first surface and a second surface relative to each other in its own thickness direction Z. The first surface can be arranged around a portion of the surface of the blade and cooperate with the blade. The support layer 2 includes a base layer 21 and a reinforcement layer 22. The base layer 21 is stacked with the pad 1 in the thickness direction Z and connected to the second surface. The base layer 21 includes a central area A1 and a peripheral area A2 surrounding the central area A1. The reinforcement layer 22 is arranged on the side of the base layer 21 away from the pad 1 in the thickness direction Z and covers the central area A1 of the base layer 21. The reinforcement layer 22 is used to support the fixing belt.

[0038] The blade guard provided in the embodiment of the present application has a gasket 1 in the shape of an arc plate and is arranged around a part of the surface of the blade and cooperates with the blade. The gasket 1 is arranged to fit the blade, so as to better protect the blade. The support layer 2 is arranged on the side surface of the gasket 1 away from the blade. The base layer 21 includes a central area A1 and a peripheral area A2 surrounding the central area A1. The reinforcement layer 22 covers the central area A1 of the base layer 21 and is used to support the fixing belt. By arranging the reinforcement layer 22 in the central area A1 of the base layer 21, the central area A1 of the blade guard has a higher rigidity, thereby improving the ability of the blade guard to resist bending deformation in the area directly in contact with the fixing belt, avoiding excessive local deformation of the blade guard and damaging the blade, and in the process of lifting, the force of the fixing belt on the reinforcement layer 22 can be more effectively dispersed to the base layer 21 and transmitted to the peripheral area A2 of the base layer 21, thereby further reducing the local stress concentration phenomenon and improving the reliability of blade lifting.

[0039] It should be noted that during the lifting process, blade guards can be placed in at least four areas, including the lifting point positions before and after the center of gravity of the blade, the leading edge area and the trailing edge area of ​​the blade. The embodiment of the present application takes the structure of the blade guard placed in the leading edge area as an example to illustrate, and of course, the blade guards in other areas can also be set to the above structure.

[0040] It can be understood that the area ratio of the central area A1 and the peripheral area A2 can be adjusted according to the contact area and force between the fixing belt and the blade guard plate, that is, it is sufficient to ensure that the reinforcement layer 22 arranged in the central area A1 can reliably support the fixing belt. The central area A1 should not be set too large to avoid increasing the weight of the guard plate.

[0041] Although the blade guard is matched with the surface of the blade through the liner 1, the blade itself may bend and deform during the lifting process, and the protective effect of the liner 1 is limited, resulting in the edge of the base layer 21 possibly contacting the surface of the blade.

[0042] See also Figures 2 to 4 In some optional embodiments, the thickness of the edge of the base layer 21 gradually decreases in the direction away from the central area A1 to achieve a stiffness transition at the edge of the base layer 21, that is, the stiffness of the edge of the base layer 21 gradually decreases in the direction away from the central area A1. Since the stiffness of its edge is relatively small, when the blade bends and deforms, the edge of the base layer 21 can also deform with the blade, thereby reducing the local stress concentration phenomenon of the blade.

[0043] In some optional embodiments, the base layer 21 includes a plurality of first layers 211 stacked along the thickness direction Z, and the area of ​​each first layer 211 gradually decreases in the direction from the liner 1 to the support layer 2. By gradually changing the area of ​​each first layer 211, after laying each first layer 211 layer by layer, a staggered structure can be formed at the edge of the base layer 21, so that the thickness of the edge of the base layer 21 gradually decreases in the direction away from the central area A1.

[0044] Optionally, the dimensions of each side of two adjacent first layers 211 in the direction from the pad 1 to the support layer 2 can be reduced in equal proportion, so that on the one hand, the stiffness of the edge of the base layer 21 can be further reduced to avoid the edge of the base layer 21 from damaging the blade; on the other hand, when the force of the fixing belt on the reinforcement layer 22 is transmitted to the base layer 21, the force can be more effectively dispersed through each layer of the first layer 211, thereby further reducing the local stress concentration phenomenon and improving the reliability of blade lifting.

[0045] See also Figures 2 to 4Since the fixing belt needs to be always located in the central area A1 of the blade guard plate during the actual hoisting process, in some optional embodiments, the support layer 2 further includes a pair of limiting layers 23, which are respectively overlapped on both sides of the reinforcement layer 22 along the first direction X, and are enclosed with the reinforcement layer 22 to form a limiting groove S for limiting the fixing belt. The first direction X is the width direction of the fixing belt. By arranging the limiting layers 23 on both sides of the reinforcement layer 22, it is easier to position the fixing belt when installing it. At the same time, during the process of hoisting the blade, the limiting layers 23 can be used to limit the movement of the fixing belt along the first direction X, ensuring that the force of the fixing belt on the blade guard plate will always act on the reinforcement layer 22, and the force condition of the blade suspension point position during the actual hoisting process is close to the calculation model, avoiding the situation where the local strain of the blade is suddenly changed due to the slippage of the fixing belt, which exceeds the damage tolerance of the blade.

[0046] Optionally, the dimension of the limiting groove S along the first direction X may be matched with the width of the fixing belt, so that it is easier to embed the fixing belt into the limiting groove S to avoid slippage of the fixing belt.

[0047] In order to limit the movement of the fixing belt along the first direction X by the limiting layer 23, in some optional embodiments, in the first direction, one end of the limiting layer 23 overlaps the reinforcing layer 22, and the other end overlaps the base layer 21, and the end thereof does not exceed the edge of the base layer 21, so that the orthographic projection of the limiting layer 23 on the pad 1 is located within the orthographic projection of the base layer 21 on the pad 1. By making the limiting layer 23 partially overlap on the base layer 21, the limiting layer 23 can be more firmly arranged on both sides of the reinforcing layer 22, thereby more reliably limiting the slippage of the fixing belt along the first direction X. At the same time, by making the orthographic projection of the limiting layer 23 on the pad 1 be located within the orthographic projection of the base layer 21 on the pad 1, it is avoided that when the blade itself is deformed, the limiting layer 23 contacts the blade, causing a sudden change in the local strain of the blade.

[0048] Optionally, the limiting layer 23 may include a plurality of third layers 231 stacked along the thickness direction Z. In the direction from the liner 1 to the support layer 2, the areas of the third layers 231 may be the same or different, which can ensure that the surface of one side for forming the limiting groove S is flat, so as to achieve the limitation of the fixing belt.

[0049] It can be understood that when the fixing belt is wrapped around the surface of the side of the supporting layer 2 facing away from the pad 1, it should also be ensured that the surface of the supporting layer 2 used to contact the fixing belt is smooth to avoid wear of the fixing belt during lifting. Therefore, in some optional embodiments, the reinforcing layer 22 includes a plurality of second layers 221 stacked along the thickness direction Z. In the direction from the pad 1 to the supporting layer 2, the size of each second layer 221 along the first direction X gradually increases, ensuring that when the limiting layer 23 overlaps the two sides of the reinforcing layer 22, the bottom of the limiting groove S formed is a smooth surface, thereby preventing wear of the fixing belt.

[0050] Optionally, when the size of the fixing belt along the first direction X is 300 mm, the size of the second ply 221 close to the base layer 21 along the first direction X can be set to 300 mm, and the size of each second fabric layer along the first direction X gradually increases from the liner 1 to the support layer 2, so that the size of the second ply 221 away from the base layer 21 along the first direction X is set to be within the range of about 450 mm to 600 mm, so that on the one hand, it can facilitate the overlap of the limiting layer 23, and on the other hand, it can also be used to support the smoothness of the surface of the fixing belt. Among them, the staggered distance between two adjacent layers of the second ply 221 can be adjusted according to the number of the second ply 221, and this application does not make specific restrictions on this.

[0051] In some optional embodiments, in the direction from the pad 1 to the supporting layer 2, the size of each second ply 221 along the second direction Y gradually decreases, and the second direction Y is arranged to intersect with the first direction X, that is, the second direction Y can be the extension direction of the fixing belt. After laying each second ply 221 layer by layer, a staggered structure can be formed on both side edges of the reinforcing layer 22 along the second direction Y. Therefore, when the fixing belt is wound around the reinforcing layer 22, the fixing belt can be transitionally arranged through the staggered structure of the edge of the reinforcing layer 22 along the second direction Y, so as to reduce the wear of the fixing belt and improve the reliability of the blade lifting.

[0052] Among them, the side surface of each second ply 221 along the second direction Y may be an inclined surface, and in the direction from the pad 1 to the support layer 2, the distance of the size staggered along the second direction Y of any two adjacent second plies 221 is the same, so that the side surface of the reinforcement layer 22 formed by each second ply 221 laid layer by layer along the second direction Y is a smooth inclined surface, and when the fixing belt is wound around the reinforcement layer 22, the wear of the fixing belt can be further reduced. Similarly, the side surface of each first ply 211 along the second direction Y may also be an inclined surface, and the staggered mode of two adjacent first plies 211 and two adjacent second plies 221 is the same, that is, the side surface of the base layer 21 formed by laying each first ply 211 layer by layer along the second direction Y is also a smooth inclined surface, thereby further preventing the base layer 21 from wearing the fixing belt and improving the reliability of blade hoisting.

[0053] Optionally, the materials of the first ply 211, the second ply 221 and the third ply 231 may be the same. For example, the first ply 211, the second ply 221 and the third ply 231 may be set to at least one of biaxial cloth and uniaxial cloth, that is, the support layer 2 may be formed by uniaxial cloth or biaxial cloth, or by alternating uniaxial cloth and biaxial cloth, for example, by alternating Bi800 glass fiber cloth and HUD650 glass fiber cloth.

[0054] See also Figures 5 to 7 In some optional embodiments, the liner 1 is configured as a foam material layer, or the liner 1 includes a plurality of hollow columns 11 filled with gas, and each hollow column 11 is arranged side by side on the surface of the support layer 2 facing the blade. By configuring the liner 1 as a soft foam material layer or hollow columns 11, it can still fit on the surface of the blade after the blade itself is deformed, thereby better protecting the blade. In addition, by configuring the liner 1 with hollow columns 11, during the lifting process, when the liner 1 contacts the surface of the blade, each hollow column 11 will deform and fit tightly with the surface of the blade, thereby making the force on the blade more uniform and also having a buffering effect.

[0055] It is understandable that the hollow column 11 has a better buffering effect than a solid column or a foam material layer. During the lifting process, the hollow column 11 can also buffer and disperse the sudden load, thereby avoiding the situation where the blade is locally subjected to excessive force. At the same time, by setting the cushion 1 as a plurality of hollow columns 11, compared with the form of the entire hollow column 11, the shape of a single hollow column 11 after inflation changes less, so that it can better fit the blade surface and is easier to install. Each hollow column 11 can extend along the first direction X, and each hollow column 11 is arranged side by side along the second direction Y, so that when the fixing belt is wound on the support layer 2, each hollow column 11 can evenly bear the force of the fixing belt, thereby improving the reliability of the lifting.

[0056] Optionally, the hollow column 11 can be made of rubber, and the hollow column 11 itself has a certain thickness, and the filling gas Q can be set to an inert gas, such as nitrogen, etc. In addition, the supporting force required for the blade can be calculated according to the weight of the blade and the hoisting requirements, so that the filling gas Q is pre-filled in the hollow column 11, and an inflation valve can also be provided to inflate the hollow column 11 when the blade guard is supported on the blade surface.

[0057] See also Figures 1 to 8 The present application also provides a method for manufacturing a blade guard plate, comprising:

[0058] A base layer 21 is laid on a part of the surface of the blade, wherein the base layer 21 includes a central area A1 and a peripheral area A2 surrounding the central area A1;

[0059] A reinforcement layer 22 is laid in the central area A1 of the base layer 21 to form a support layer 2;

[0060] Solidifying the support layer 2 and separating the support layer 2 from the blade;

[0061] The backing 1 is bonded to the side of the base layer 21 facing away from the reinforcing layer 22 to form a blade shroud.

[0062] It is understandable that when preparing the support layer 2, a part of the surface of the blade can be used as a reference, and the base layer 21 and the reinforcement layer 22 can be laid layer by layer on the part of the surface of the blade to form the support layer 2. Therefore, the support layer 2 can be prepared based on the required hoisting position of the blade and the hoisting position as a reference, so that the blade guard can be more closely attached to the blade surface, and the reliability of blade hoisting is improved.

[0063] Among them, since the reinforcing layer 22 is set in the central area A1 of the base layer 21, the central area A1 of the blade guard has a higher rigidity, thereby improving the ability of the blade guard to resist bending deformation in the area where the blade guard is in direct contact with the fixing belt, avoiding excessive local deformation of the blade guard and damaging the blade, and, during the lifting process, the force of the fixing belt exerted on the reinforcing layer 22 can be more effectively dispersed to the base layer 21 and transmitted to the outer area A2 of the base layer 21, thereby reducing local stress concentration and improving the reliability of blade lifting.

[0064] Optionally, after preparing the support layer 2, you can choose to cut a foam material layer of appropriate area according to the lifting requirements of the blade and bond it to the side surface of the base layer 21 away from the reinforcement layer 22, or bond multiple hollow columns 11 side by side to the side surface of the base layer 21 away from the reinforcement layer 22. The specific structure of the pad 1 can be adjusted according to actual preparation conditions and requirements.

[0065] To prepare the base layer 21, in some optional embodiments, the step of laying the base layer 21 on a portion of the surface of the blade includes: laying multiple first layers 211 layer by layer on the portion of the surface of the blade to form the base layer 21, and the area of ​​each first layer 211 gradually decreases in the direction away from the blade, so that the thickness of the edge of the base layer 21 gradually decreases in the direction away from the central area A1.

[0066] Among them, the first layer 211 can be impregnated with resin and then laid layer by layer on a part of the surface of the blade by hand lay-up or bag pressing. By gradually setting the area of ​​each layer of the first layer 211, after laying each first layer 211 layer by layer, a staggered structure can be formed at the edge of the base layer 21, so that the thickness of the edge of the base layer 21 gradually decreases in the direction away from the central area A1, so as to achieve a stiffness transition at the edge of the base layer 21. Since the stiffness of its edge is relatively small, when the blade is bent and deformed, the edge of the base layer 21 can also be deformed with the blade, thereby further reducing the local stress concentration phenomenon of the blade and improving the reliability of blade lifting.

[0067] In some optional embodiments, after laying the reinforcement layer 22 in the central area A1 of the base layer 21, and before the base layer 21 and the reinforcement layer 22 are detached from the blade surface after being cured, it also includes: laying limiting layers 23 in pairs on both sides of the reinforcement layer 22 along the first direction X, and in the first direction X, one end of the limiting layer 23 is overlapped with the reinforcement layer 22, and the other end is overlapped with the base layer 21.

[0068] By arranging the limiting layers 23 in pairs on both sides of the reinforcing layer 22, after the limiting layers 23 are laid, they can be enclosed with the reinforcing layer 22 to form a limiting groove S for limiting the fixing belt, ensuring that the force of the fixing belt on the blade guard will always act on the reinforcing layer 22, avoiding the situation where the local strain of the blade is suddenly changed due to the slip of the fixing belt. At the same time, by overlapping one end of the limiting layer 23 with the reinforcing layer 22 and the other end with the base layer 21, the limiting layer 23 can be more firmly arranged on both sides of the reinforcing layer 22, thereby more reliably limiting the slip of the fixing belt along the first direction X.

[0069] To prepare the reinforcement layer 22, in some optional embodiments, the step of laying the reinforcement layer 22 in the central area A1 of the base layer 21 includes: laying a plurality of second layers 221 layer by layer in the central area A1 of the base layer 21 to form the reinforcement layer 22, the size of each second layer 221 along the first direction X gradually increases in the direction away from the blade, and the size along the second direction Y gradually decreases, and the second direction Y is arranged to intersect with the first direction X. The second layers 221 can also be impregnated with resin and laid layer by layer on the base layer 21 by hand lay-up or bag pressing. By gradually setting the size of each second layer 221 in the first direction X and the second direction Y, it is possible to avoid wear on the fixing belt while ensuring the support effect of the fixing belt, thereby further improving the reliability of the hoisting.

[0070] 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 are no structural conflicts. 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 blade guard plate for supporting a fixing belt wound around a blade, characterized in that: The blade guard comprises: The liner (1) is in the shape of an arc-shaped plate, and the liner (1) has a first surface and a second surface opposite to each other in the thickness direction thereof, and the first surface can be arranged around a part of the surface of the blade and cooperate with the blade; A support layer (2), comprising a base layer (21) and a reinforcement layer (22), wherein the base layer (21) is stacked with the liner (1) in the thickness direction and connected to the second surface, the base layer (21) comprises a central region and a peripheral region surrounding the central region, the reinforcement layer (22) is arranged on a side of the base layer (21) away from the liner (1) in the thickness direction and covers the central region of the base layer (21), and the reinforcement layer (22) is used to support the fixing belt; The supporting layer (2) further comprises limiting layers (23) arranged in pairs, the limiting layers (23) arranged in pairs are respectively overlapped on both sides of the reinforcing layer (22) along the first direction, and are enclosed with the reinforcing layer (22) to form limiting grooves for limiting the fixing belt.

2. The blade guard according to claim 1, characterized in that: The thickness of the edge of the base layer (21) gradually decreases in a direction away from the central area.

3. The blade guard according to claim 2, characterized in that: The base layer (21) comprises a plurality of first layers (211) stacked along the thickness direction, and the area of ​​each first layer (211) gradually decreases in the direction from the pad (1) to the support layer (2).

4. The blade guard according to claim 3, characterized in that: In the first direction, one end of the limiting layer (23) overlaps the reinforcing layer (22), and the other end overlaps the base layer (21), and the end of the limiting layer (23) does not exceed the edge of the base layer (21), so that the orthographic projection of the limiting layer (23) on the pad (1) is located within the orthographic projection of the base layer (21) on the pad (1).

5. The blade guard according to claim 3, characterized in that: The reinforcing layer (22) comprises a plurality of second plies (221) stacked along the thickness direction, and in the direction from the pad (1) to the supporting layer (2), the size of each of the second plies (221) along the first direction gradually increases.

6. The blade guard according to claim 5, characterized in that: In the direction from the liner (1) to the support layer (2), the size of each of the second layers (221) along a second direction gradually decreases, and the second direction is arranged to intersect with the first direction.

7. The blade guard according to claim 1, characterized in that: The cushion (1) is configured as a foam material layer, or the cushion (1) comprises a plurality of hollow columns (11) filled with gas, each of the hollow columns (11) being arranged side by side on a surface of the support layer (2) facing the blade.

8. A method for manufacturing a blade guard plate, characterized in that: include: Laying a base layer (21) on a portion of the surface of the blade, the base layer (21) comprising a central area and a peripheral area surrounding the central area; Laying a reinforcement layer (22) in the central area of ​​the base layer (21) to form a support layer (2); The limiting layers (23) are laid in pairs on both sides of the reinforcing layer (22) along a first direction, and in the first direction, one end of the limiting layer (23) is overlapped with the reinforcing layer (22), and the other end is overlapped with the base layer (21); Solidifying the support layer (2) and separating the support layer (2) from the surface of the blade; A pad (1) is bonded to the side of the base layer (21) facing away from the reinforcement layer (22) to form the blade guard plate.

9. The manufacturing method according to claim 8, characterized in that: The step of laying the base layer (21) on a part of the surface of the blade comprises: A plurality of first layers (211) are laid layer by layer on a partial surface of the blade to form the base layer (21), and the area of ​​each of the first layers (211) gradually decreases in a direction away from the blade, so that the thickness of the edge of the base layer (21) gradually decreases in a direction away from the central area.

10. The manufacturing method according to claim 8, characterized in that: The step of laying the reinforcement layer (22) in the central area of ​​the base layer (21) comprises: A plurality of second plies (221) are laid layer by layer in a central area of ​​the base layer (21) to form the reinforcement layer (22), wherein the size of each of the second plies (221) along the first direction gradually increases in a direction away from the blade, and the size along the second direction gradually decreases, and the second direction is arranged to intersect with the first direction.

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