Flexible screen support

Abstract

The embodiment of the utility model relates to a flexible screen supporting piece. The supporting piece is used for supporting the flexible screen and comprises a first supporting plate and two second supporting plates, the two second supporting plates are connected to the two ends of the first supporting plate respectively, the first supporting plate at least corresponds to a bending area of the flexible screen, and the bending performance of the first supporting plate is higher than that of the second supporting plates. And the density of the second supporting plate is smaller than that of the first supporting plate. According to the flexible screen supporting piece provided by the embodiment of the invention, the two materials are spliced, so that the material with high bending performance corresponds to the bending area of the flexible screen, the material with relatively light weight corresponds to the non-bending area of the flexible screen, and the advantages of the two materials are combined; the flexible screen supporting piece has high bending performance, and meanwhile light weight is achieved.

Description

Technical Field

[0001] The present application relates to the field of flexible screen technology, and in particular to a flexible screen support. Background Art

[0002] Flexible screen foldable electronic products (such as foldable screen mobile phones, foldable screen computers, etc.) are accepted by more and more users due to their large screens and easy portability. The supporting parts that support the flexible screen play a vital role in foldable screen electronic products.

[0003] The materials of the support parts are generally stainless steel, titanium alloy and carbon fiber. Stainless steel has high strength, high hardness and high bending performance, but stainless steel is heavy. The strength, hardness and bending performance of titanium alloy are second only to stainless steel, and the weight of titanium alloy is lighter than stainless steel, but the cost of titanium alloy is higher. Carbon fiber material has high strength and light weight, but carbon fiber material is more brittle and has low bending performance.

[0004] It is not difficult to see that the above three commonly used supporting materials for flexible screens have their own advantages and disadvantages. How to apply the supporting parts of different materials to the supporting parts of flexible screens by taking advantage of their strengths and weaknesses is an urgent problem to be solved. Utility Model Content

[0005] In view of this, an embodiment of the present application provides a flexible screen support to solve at least one problem existing in the background technology.

[0006] In a first aspect, an embodiment of the present application provides a flexible screen support member, which is used to support a flexible screen. The support member includes a first support plate and two second support plates, the two second support plates are respectively connected to two ends of the first support plate, the first support plate at least corresponds to the bending area of ​​the flexible screen, the bending performance of the first support plate is higher than the bending performance of the second support plate, and the density of the second support plate is less than the density of the first support plate.

[0007] In combination with the first aspect of the present application, in an optional embodiment, a plurality of half-etched grooves are formed on the surface of the first support plate, and the plurality of half-etched grooves are connected to the two end edges of the first support plate;

[0008] A connection block is formed at one end of the second support plate, the shape of the connection block matches the shape of the half-etched groove, and the connection block is embedded in the half-etched groove so that the first support plate is fixedly connected to the second support plate.

[0009] In combination with the first aspect of the present application, in an optional implementation manner, the ratio of the depth of the half-etched groove to the thickness of the first support plate is 1 / 4 to 3 / 4.

[0010] In combination with the first aspect of the present application, in an optional embodiment, the half-etched groove is formed with an opening, the opening is located on the edge of the first support plate, and along the bending line direction of the flexible screen, the size of the opening is smaller than the maximum size of the connecting block.

[0011] In combination with the first aspect of the present application, in an optional implementation manner, the half-etched groove is formed with a trapezoidal structure or an arc-shaped structure.

[0012] In combination with the first aspect of the present application, in an optional implementation, the material of the first support plate is any one of stainless steel, titanium alloy and aluminum alloy.

[0013] In combination with the first aspect of the present application, in an optional implementation, the material of the second support plate is any one of carbon fiber, titanium alloy and aluminum alloy.

[0014] In combination with the first aspect of the present application, in an optional implementation, the material of the second support plate is titanium alloy or aluminum alloy, and the half-etched groove and the connecting block are obtained by chemical etching.

[0015] In combination with the first aspect of the present application, in an optional embodiment, the material of the second support plate is carbon fiber, the second support plate includes a first fiberboard, a second fiberboard and a third fiberboard, the first fiberboard, the second fiberboard and the third fiberboard are stacked and fixedly connected in sequence, the fibers of at least two of the first fiberboard, the second fiberboard and the third fiberboard extend in different directions, and the total thickness formed by stacking the first fiberboard, the second fiberboard and the third fiberboard is equal to the thickness of the first support plate.

[0016] In combination with the first aspect of the present application, in an optional embodiment, the first fiberboard, the second fiberboard and the third fiberboard all include a fiber base layer and a resin filled in the gaps and on the surface of the fiber base layer, and the fiber base layer is woven from at least two fibers in different directions.

[0017] In combination with the first aspect of the present application, in an optional implementation, the connection block includes a first connection block and a second connection block, and the first connection block and the second connection block are alternately arranged along the bending line direction of the flexible screen.

[0018] A plurality of the first connecting blocks are formed by extending from the end of the first fiberboard, and a plurality of the second connecting blocks are formed by extending from the end of the third fiberboard.

[0019] A plurality of the half-etched grooves are formed on both side surfaces of the first support plate, and the plurality of the half-etched grooves on one side surface of the first support plate correspond to the plurality of the first connecting blocks, and the plurality of the half-etched grooves on the other side surface of the first support plate correspond to the plurality of the second connecting blocks, the first connecting blocks are embedded in the half-etched grooves on one side surface of the first support plate, and the second connecting blocks are embedded in the half-etched grooves on the other side surface of the first support plate, so that the first support plate is fixedly connected to the second support plate.

[0020] A flexible screen support component is provided in an embodiment of the present application. The flexible screen support component is prepared by splicing two materials so that the material with high bending performance corresponds to the bending area of ​​the flexible screen, and the material with lighter weight corresponds to the non-bending area of ​​the flexible screen. By combining the advantages of the two materials, the flexible screen support component has both high bending performance and lightweight.

[0021] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0023] Figure 1 A schematic diagram of the overall structure of a flexible screen support provided in an embodiment of the present application;

[0024] Figure 2 An exploded schematic diagram of a first support plate and two second support plates of a flexible screen support member provided in an embodiment of the present application;

[0025] Figure 3 A schematic structural diagram of a first support plate having a half-etched groove with a trapezoidal structure in a flexible screen support member provided in an embodiment of the present application;

[0026] Figure 4 A schematic structural diagram of a first support plate having a half-etched groove with an arc-shaped structure in a flexible screen support member provided in another embodiment of the present application;

[0027] Figure 5 A schematic structural diagram of a first fiberboard, a second fiberboard and a third fiberboard of a second support board in a flexible screen support member provided in an embodiment of the present application;

[0028] Figure 6 A schematic diagram of the structure of a fiber base layer in a flexible screen support provided in an embodiment of the present application;

[0029] Figure 7 A schematic structural diagram of a second support plate in a flexible screen support member provided in one embodiment of the present application.

[0030] Reference numerals:

[0031] 10. First support plate; 101. Bending area; 102. Through hole; 110. Half-etched groove; 111. Half-etched groove with trapezoidal structure; 112. Half-etched groove with arc-shaped structure; 20. Second support plate; 210. Connecting block; 211. First connecting block; 212. Second connecting block; 201. First fiberboard; 2011. Fiber base layer; 202. Second fiberboard; 203. Third fiberboard. DETAILED DESCRIPTION

[0032] The exemplary embodiments disclosed in the present application will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the specific embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present application and to fully convey the scope disclosed in the present application to those skilled in the art.

[0033] In the following description, a large number of specific details are given to provide a more thorough understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application, some technical features known in the art are not described; that is, all features of the actual embodiments are not described here, and well-known functions and structures are not described in detail.

[0034] In the drawings, the sizes of layers, regions, elements and their relative sizes may be exaggerated for clarity. Like reference numerals denote like elements throughout.

[0035] It should be understood that when an element or layer is referred to as "on ...", "adjacent to ...", "connected to" or "coupled to" other elements or layers, it can be directly on, adjacent to, connected to or coupled to other elements or layers, or there can be intervening elements or layers. On the contrary, when an element is referred to as "directly on ...", "directly adjacent to ...", "directly connected to" or "directly coupled to" other elements or layers, there is no intervening element or layer. It should be understood that although the terms first, second, third, etc. can be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present application, the first element, component, region, layer or part discussed below can be represented as the second element, component, region, layer or part. And when the second element, component, region, layer or part is discussed, it does not indicate that the present application necessarily has the first element, component, region, layer or part.

[0036] Spatially relative terms such as "under", "beneath", "below", "under", "above", "above", etc., may be used here for convenience of description to describe the relationship between an element or feature shown in the figure and other elements or features. It should be understood that in addition to the orientation shown in the figure, the spatial relationship terms are intended to also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is turned over, then the elements or features described as "under other elements" or "under it" or "under it" will be oriented as "on" other elements or features. Therefore, the exemplary terms "under" and "under" may include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or other orientations) and the spatial descriptors used herein are interpreted accordingly.

[0037] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present application. When used herein, the singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0038] In order to thoroughly understand the present application, detailed steps and detailed structures will be presented in the following description to illustrate the technical solution of the present application. The preferred embodiments of the present application are described in detail below, but in addition to these detailed descriptions, the present application may also have other implementation methods.

[0039] The flexible screen support provided in the embodiment of the present application is mainly used for flexible screen folding electronic products, which may include mobile phones, tablets, laptops, etc.

[0040] The flexible screen support provided in the embodiment of the present application is prepared by splicing two materials used as a support, so that the material with higher bending performance corresponds to the bending area 101 of the flexible screen, and the material with lighter weight corresponds to the non-bending area 101 of the flexible screen. The advantages of the two materials are taken and used for different purposes, so that the flexible screen support has both higher bending performance and is lightweight.

[0041] A flexible screen support provided in an embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0042] Specifically, Figure 1 As shown, an embodiment of the present application provides a flexible screen support member, which is used to support a flexible screen. The support member includes a first support plate and two second support plates, the two second support plates are respectively connected to both ends of the first support plate, the first support plate at least corresponds to the bending area 101 of the flexible screen, the bending performance of the first support plate is higher than the bending performance of the second support plate, and the density of the second support plate is less than the density of the first support plate.

[0043] In the embodiment of the present application, a support member is formed by splicing a first support plate and a second support plate, so that the area of ​​the support member corresponding to the bending zone 101 of the flexible screen has a higher bending performance, and at the same time, the area corresponding to the non-bending zone 101 of the flexible screen has a lighter weight. The support member combines the advantages of two materials, so that the flexible screen support member has both higher bending performance and is lightweight.

[0044] The flexible screen will generate stress during the bending process, and this stress will also be generated on the support member. Therefore, the connection method of the support member formed by splicing two materials is particularly important.

[0045] Specifically, in an optional embodiment, if Figure 2 As shown, a plurality of half-etched grooves 110 are formed on the surface of the first support plate, and the plurality of half-etched grooves 110 are connected to both end edges of the first support plate.

[0046] A connection block 210 is formed at one end of the second support plate. The shape of the connection block 210 matches the shape of the half-etched groove 110. The connection block 210 is embedded in the half-etched groove 110 so that the first support plate is fixedly connected to the second support plate.

[0047] In the embodiment of the present application, a half-etched groove 110 is formed on the first support plate, and a connecting block 210 is formed at the end of the second support plate corresponding to the position of the half-etched groove 110. The connecting block 210 is embedded in the half-etched groove 110 to fix the first support plate to the second support plate.

[0048] The first support plate 10 has a high bending performance. The material of the first support plate 10 is preferably a metal material, which has a high bending performance.

[0049] Preferably, the half-etched groove 110 is formed on the surface of the first support plate by chemical etching, which has high precision and simple process. Chemical etching is to obtain the first support plate with the half-etched groove 110 after coating, exposing, developing, etching and removing the film on the metal plate surface.

[0050] like Figure 1 and Figure 2 As shown, a plurality of through holes 102 are provided in the bending area of ​​the first support plate, and the through holes 102 are used to reduce the stress generated during the bending process of the flexible screen. The through holes 102 can be obtained together with the half-etched grooves 110 through chemical etching, thereby reducing the process flow and improving the forming efficiency of the first support plate.

[0051] In an optional embodiment, the half-etched groove 110 is a groove formed on one side surface of the first support plate, and the depth of the groove is 1 / 4 to 3 / 4 of the thickness of the first support plate.

[0052] The proportional relationship between the depth of the half-etched groove 110 and the thickness of the first support plate can be adjusted according to specific needs to be implemented in the chemical etching process, and the embodiment of the present application is not limited thereto.

[0053] It should be noted that the connection block 210 and the half-etched groove 110 are fixedly connected by resin, and the resin is applied to the half-etched groove 110 and then the connection block 210 is placed in the half-etched groove 110 for alignment to achieve fixed connection. The specific type of resin is not limited and can be determined according to specific needs.

[0054] It should also be noted that there is a tolerance in the thickness of the second support plate during the production process. The etching depth of the half-etched groove 110 on the first support plate is adjusted to make the thickness of the connecting block 210 plus the resin equal to the depth of the half-etched groove 110, so that the surfaces of the first support plate and the second support plate are located on the same horizontal plane after being fixedly connected.

[0055] In an optional embodiment, the half-etched groove 110 is formed with an opening, and the opening is located on the edge of the first support plate. Along the bending line direction of the flexible screen, the size of the opening is smaller than the maximum size of the connecting block 210.

[0056] During the bending process of the flexible screen, the bending will generate stress on the flexible screen support, which is decomposed into "tensile stress" pointing to both sides on the outside of the bending part, and decomposed into "compression stress" pointing to the middle position on the inside of the bending part. Both "tensile stress" and "compression stress" will affect the connection firmness between the first support plate 10 and the second support plate 20 in this application.

[0057] Along the bending line direction of the flexible screen, the size of the opening is smaller than the maximum size of the connecting block 210. It can be understood that: when the flexible screen is bending, the small opening can limit the translation of the connecting block 210, that is, the inner wall of the half-etched groove 110 can withstand the "tensile stress" or "compression stress" exerted on the connecting block 210, and further effectively resist the stress generated by the flexible screen during the bending process, thereby avoiding the stress generated by the bending affecting the connection firmness between the first support plate 10 and the second support plate 20.

[0058] In a specific embodiment, if Figure 3 and Figure 4 As shown, the half-etched groove 110 is formed in a trapezoidal structure or an arc-shaped structure.

[0059] The trapezoidal structure half-etched groove 111, the short bottom edge of the trapezoidal structure half-etched groove 111 is located on the edge of the first support plate, that is, at the opening. During the bending process of the flexible screen, the two waists of the trapezoidal structure half-etched groove 111 and the groove wall of the trapezoidal structure half-etched groove 111 corresponding to the longer bottom edge can limit the connection block 210 embedded in the trapezoidal structure half-etched groove 111.

[0060] The arc-shaped half-etched groove 112 also works on the same principle. During the bending process of the flexible screen, the groove wall of the half-etched groove 110 can withstand the "tensile stress" or "compression stress" exerted on the connecting block 210, further effectively resisting the stress generated by the flexible screen during the bending process.

[0061] Of course, the structure of the half-etched groove 110 is not limited to the trapezoidal half-etched groove 111 or the arc-shaped half-etched groove 112, and can also be other structures, which are not limited in the embodiment of the present application. As an example, the half-etched groove 110 can also be an I-shaped structure.

[0062] In an optional embodiment, the material of the first support plate 10 is any one of stainless steel, titanium alloy and aluminum alloy. Stainless steel, titanium alloy and aluminum alloy are all metal materials, and metal materials have good ductility. Metal materials with good ductility also have high bending performance.

[0063] In an optional embodiment, the second support plate is made of any one of carbon fiber, titanium alloy and aluminum alloy.

[0064] The density of carbon fiber, titanium alloy and aluminum alloy is lower than that of stainless steel. The overall mass of the support can be reduced by replacing stainless steel with any one of carbon fiber, titanium alloy and aluminum alloy.

[0065] In an optional embodiment, the second support plate is made of titanium alloy or aluminum alloy, and the half-etched groove 110 and the connecting block 210 are obtained by chemical etching.

[0066] That is to say, when the material of the second support plate is titanium alloy or aluminum alloy, the second support plate is obtained by chemical etching, and the chemical etching has high precision, simple process and high production efficiency.

[0067] In another alternative embodiment, if Figure 5 As shown, the material of the second support plate is carbon fiber, and the second support plate includes a first fiberboard 201, a second fiberboard 202 and a third fiberboard 203, the first fiberboard 201, the second fiberboard 202 and the third fiberboard 203 are stacked and fixedly connected in sequence, the fiber extension directions of at least two of the first fiberboard 201, the second fiberboard 202 and the third fiberboard 203 are different, and the total thickness formed by stacking the first fiberboard 201, the second fiberboard 202 and the third fiberboard 203 is equal to the thickness of the first support plate 10.

[0068] In the embodiment of the present application, the second support plate is formed by stacking the first fiberboard 201, the second fiberboard 202 and the third fiberboard 203. The density of carbon fiber is lower than that of titanium alloy, aluminum alloy and stainless steel, which can greatly reduce the total mass of the flexible screen support and achieve lightweight products. In addition, the second support plate is formed by stacking the first fiberboard 201, the second fiberboard 202 and the third fiberboard 203. During the stacking process, the fiber directions in the first fiberboard 201, the second fiberboard 202 and the third fiberboard 203 are different, which can improve the structural strength of the second support plate.

[0069] In an alternative embodiment, if Figure 6 As shown, the first fiberboard 201, the second fiberboard 202 and the third fiberboard 203 all include a fiber base 2011 and a resin filled in the gaps and on the surface of the fiber base 2011, and the fiber base 2011 is woven from fibers in at least two different directions.

[0070] That is to say, the fiber base layers 2011 in the first fiberboard 201, the second fiberboard 202 and the third fiberboard 203 are all woven from fibers in two different directions. During the stacking process of the first fiberboard 201, the second fiberboard 202 and the third fiberboard 203, the extension directions of the fibers in the first fiberboard 201, the second fiberboard 202 and the third fiberboard 203 are also different, so that the second support plate 20 forms a multi-layer mesh structure, further improving the structural strength of the second support plate 20.

[0071] Furthermore, the angle formed between the fibers in at least two different directions in the fiber base layer 2011 is not limited and can be formed according to the needs, for example, 30°, 90°, and 120°.

[0072] In an optional embodiment, a plurality of connection blocks 210 are formed at the end of one side surface of the second support plate, a plurality of half-etched grooves 110 are formed on one side surface of the first support plate, and the connection blocks 210 are embedded in the half-etched grooves 110 to achieve a fixed connection between the first support block and the second support plate.

[0073] It should be understood that a connection block 210 is formed by extending a portion of the end of the second support plate, and correspondingly, the first support plate also has a half-etched groove 110 formed on only one side of the surface, and the connection block 210 is embedded in the half-etched groove 110 to achieve fixed connection.

[0074] In an alternative embodiment, Figure 3 and Figure 7 As shown, the connecting block 210 includes a first connecting block 211 and a second connecting block 212, and the first connecting block 211 and the second connecting block 212 are arranged alternately along the bending line direction of the flexible screen.

[0075] A plurality of first connection blocks 211 are extended from the end of the first fiberboard 201 , and a plurality of second connection blocks 212 are extended from the end of the third fiberboard 203 .

[0076] A plurality of the half-etched grooves 110 are formed on both side surfaces of the first support plate, and the plurality of the half-etched grooves 110 on one side surface of the first support plate correspond to a plurality of the first connecting blocks 211, and the plurality of the half-etched grooves 110 on the other side surface of the first support plate correspond to a plurality of the second connecting blocks 212, the first connecting blocks 211 are embedded in the half-etched grooves 110 on one side surface of the first support plate, and the second connecting blocks 212 are embedded in the half-etched grooves 110 on the other side surface of the first support plate, so that the first support plate is fixedly connected to the second support plate.

[0077] In the embodiment of the present application, a first connecting block 211 and a second connecting block 212 are respectively formed at the ends of the first fiberboard 201 and the third fiberboard 203 of the outermost layer of the second support plate, and the first connecting block 211 and the second connecting block 212 are alternately embedded from the upper and lower sides of the first support plate, thereby greatly improving the connection firmness between the first support plate and the second support plate.

[0078] It should be understood that the above embodiments are exemplary and are not intended to include all possible implementations included in the claims. Various modifications and changes may be made on the basis of the above embodiments without departing from the scope of the present disclosure. Similarly, the various technical features of the above embodiments may be arbitrarily combined to form other embodiments of the present application that may not be explicitly described. Therefore, the above embodiments only express several implementations of the present application and do not limit the scope of protection of the patent of this application.

Claims

1. A flexible screen support, the support is used to support a flexible screen, characterized in that: The support member includes a first support plate and two second support plates, the two second support plates are respectively connected to the two ends of the first support plate, the first support plate at least corresponds to the bending area of ​​the flexible screen, the bending performance of the first support plate is higher than the bending performance of the second support plate, and the density of the second support plate is less than the density of the first support plate.

2. The flexible screen support according to claim 1, characterized in that: A plurality of half-etched grooves are formed on the surface of the first support plate, and the plurality of half-etched grooves are connected to the two end edges of the first support plate; A connection block is formed at one end of the second support plate, the shape of the connection block matches the shape of the half-etched groove, and the connection block is embedded in the half-etched groove so that the first support plate is fixedly connected to the second support plate.

3. The flexible screen support according to claim 2, characterized in that: The ratio of the depth of the half-etched groove to the thickness of the first support plate is 1 / 4 to 3 / 4.

4. The flexible screen support according to claim 2, characterized in that: The half-etched groove is formed with an opening, and the opening is located on the edge of the first supporting plate. Along the bending line direction of the flexible screen, the size of the opening is smaller than the maximum size of the connecting block.

5. The flexible screen support according to claim 4, characterized in that: The half-etched groove is formed in a trapezoidal structure or an arc-shaped structure.

6. The flexible screen support according to claim 2, characterized in that: The first support plate is made of any one of stainless steel, titanium alloy and aluminum alloy.

7. The flexible screen support according to claim 2, characterized in that: The second support plate is made of any one of carbon fiber, titanium alloy and aluminum alloy.

8. The flexible screen support according to claim 7, characterized in that: The second support plate is made of titanium alloy or aluminum alloy, and the half-etched groove and the connecting block are obtained by chemical etching.

9. The flexible screen support according to claim 7, characterized in that: The material of the second support plate is carbon fiber, and the second support plate includes a first fiberboard, a second fiberboard and a third fiberboard, the first fiberboard, the second fiberboard and the third fiberboard are stacked and fixedly connected in sequence, the fibers of at least two of the first fiberboard, the second fiberboard and the third fiberboard extend in different directions, and the total thickness formed by stacking the first fiberboard, the second fiberboard and the third fiberboard is equal to the thickness of the first support plate.

10. The flexible screen support according to claim 9, characterized in that: The first fiberboard, the second fiberboard and the third fiberboard all include a fiber base layer and a resin filled in the gaps and on the surface of the fiber base layer, and the fiber base layer is woven from fibers in at least two different directions.

11. The flexible screen support according to claim 9, characterized in that: The connecting block includes a first connecting block and a second connecting block, and the first connecting block and the second connecting block are arranged alternately along the bending line direction of the flexible screen. A plurality of the first connecting blocks are formed by extending from the end of the first fiberboard, and a plurality of the second connecting blocks are formed by extending from the end of the third fiberboard. A plurality of the half-etched grooves are formed on both side surfaces of the first support plate, and the plurality of the half-etched grooves on one side surface of the first support plate correspond to the plurality of the first connecting blocks, and the plurality of the half-etched grooves on the other side surface of the first support plate correspond to the plurality of the second connecting blocks, the first connecting blocks are embedded in the half-etched grooves on one side surface of the first support plate, and the second connecting blocks are embedded in the half-etched grooves on the other side surface of the first support plate, so that the first support plate is fixedly connected to the second support plate.

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