Integrated composite cab structure

Abstract

The invention discloses an integrated composite cab structure which comprises a cab structure outer layer, a cab structure inner layer and a cab framework. The cab structure outer layer is arranged on the outer side of the cab and serves as a cab hood; the cab structure inner layer is arranged in the cab and serves as interior decoration of the cab; the cab framework is pre-buried in a structure between the cab structure outer layer and the cab structure inner layer; and the cab structure outer layer, the cab structure inner layer and the cab framework are integrally cured and formed. According to the integrated composite cab structure, the cab framework, the cab structure inner layer (cab interior decoration) and the cab structure outer layer (cab hood) are integrated, a composite interlayer structure is adopted, the cab framework, the cab interior decoration and the cab hood are integrated, and the composite cab structure is formed.

Description

Technical Field

[0001] The present invention relates to the technical field of rail transit, and more specifically, to an integrated composite driver's cab structure for rail transit. Background Art

[0002] At present, the structure of the driver's cab of rail transit vehicles mainly includes the driver's cab hood, the driver's cab frame, the cold-proof material, the driver's cab interior, etc. Each structure needs to be designed, produced and installed separately. When designing this kind of driver's cab structure, it is necessary to consider the installation space of each structure and reserve a large tolerance size; in the production process, each structure needs to be installed in sequence, the process steps are complicated, the work time is wasted, and the production efficiency is reduced.

[0003] Traditional cab hoods are mostly single-layer fiberglass or fiberglass sandwich structures. Currently, carbon fiber composite sandwich structures are also used in cab hoods. Since the cab hood is a curved structure and the cab frame is a metal welded structure, it is difficult to match the cab hood and the cab frame. There is a large gap between the cab hood and the cab frame. At the same time, the cab interior needs to cover the cab frame, further reducing the space in the cab.

[0004] In the design process of the existing cab structure of rail transit vehicles, the cab hood is designed first, and then the cab frame is designed according to the space inside the hood. The traditional curved cab hood is difficult to match with the welded cab frame, and there is a large gap between the two. The interior of the cab needs to completely cover the cab frame during design. Considering the installation situation, the interior of the cab is generally designed in three pieces.

[0005] During the production and installation of the cab structure, the cab frame or the frame hood must be installed first, and then the cab interior must be installed. Due to the limited space in the cab, the various parts of the cab interior are curved, which makes matching difficult and requires repeated adjustments during the installation process.

[0006] The disadvantages of this design are: 1. The installation of the cab structure is complicated and tedious, which wastes man-hours and reduces production efficiency. 2. The traditional curved cab hood is difficult to match with the welded cab frame, and there is a large gap between the two. At the same time, the cab interior needs to cover the cab frame, which wastes cab space.

[0007] Therefore, there is a need for an optimized integrated composite driver's cab structure for rail transit. Summary of the invention

[0008] Based on this, and to overcome the deficiencies of the prior art, an integrated composite driver's cab structure is provided.

[0009] Based on the above purpose, the following technical solutions are adopted: The integrated composite driver's cab structure provided by the present invention comprises: The driver's cab structure outer layer is arranged on the outside of the driver's cab and serves as a driver's cab head cover; The inner layer of the driver's cab structure is arranged inside the driver's cab and serves as the interior decoration of the driver's cab; A cab frame, wherein the cab frame is pre-buried in a structure between an outer layer of the cab structure and an inner layer of the cab structure; The outer layer of the driver's cab structure, the inner layer of the driver's cab structure and the driver's cab frame are solidified and formed as a whole.

[0010] In some embodiments, the composite cab structure further includes an electrical equipment wiring cavity for placing wiring harnesses required for electrical equipment, and the electrical equipment wiring cavity is pre-buried in the structure between the outer layer of the cab structure and the inner layer of the cab structure.

[0011] In some embodiments, the composite cab structure also includes a cab structure middle layer, which fills the space between the cab structure outer layer and the cab structure inner layer except for the electrical equipment wiring cavity and the cab frame.

[0012] In some embodiments, the composite cab structure further includes a slide groove, which is disposed on the inner layer of the cab structure and is configured toward the interior of the cab for installation of the cab and other components.

[0013] In some embodiments, the cab frame is a hollow tube, the wall thickness of the hollow tube is 3~8mm, and the cross-sectional length of the hollow tube is 40~80mm; and the cab frame extends along the curved surface of the outer layer of the cab structure in its length direction.

[0014] In some embodiments, the electrical equipment wiring cavity is a hollow tube, the wall thickness of the hollow tube is 1~2mm, and the cross-sectional length of the hollow tube is 40~80mm; and the electrical equipment wiring cavity extends along the curved surface of the outer layer of the driver's cab structure in its length direction.

[0015] In some embodiments, the thickness of the outer layer of the cab structure and the inner layer of the cab structure is 3-5 mm; the thickness of the cab structure is 50-100 mm.

[0016] In some embodiments, the electrical equipment wiring cavity includes an upper port and a lower port for incoming and outgoing lines, and the upper port and the lower port pass through the inner layer of the driver's cab structure and are connected to the interior of the driver's cab; wherein the upper port is located inside the middle top of the driver's cab and can be blocked by the middle top of the driver's cab; the lower port is located inside the operating console of the driver's cab and can be blocked by the operating console.

[0017] In some embodiments, the slide grooves are arranged at intervals along the edges of the inner layer of the cab structure to facilitate the bolted installation of the composite cab structure and the vehicle body; and a number of slide grooves are also arranged at intervals at corresponding positions between the inner layer of the cab structure and the operating console and middle top shielding area of ​​the cab, so as to be used for the installation of the composite cab structure with the operating console, the equipment inside the middle top of the cab, and the middle top of the cab.

[0018] The present invention also provides a production process for the integrated composite driver's cab structure as described above, comprising: The outer layer of the cab structure is obtained by mold manufacturing, and the inner side of the outer layer of the cab structure is wetted with an adhesive; According to the design, the cab frame and electrical equipment wiring cavity are arranged on the inner side of the outer layer of the cab structure, and then the middle layer of the cab structure is used to fill the gap; The inner layer of the cab structure is laminated from the inner side of the outer layer of the cab structure to solidify the outer layer of the cab structure, the cab frame, the electrical equipment wiring cavity, the middle layer of the cab structure and the inner layer of the cab structure; According to the design, the slide groove is bonded to the inner side of the inner layer of the cab structure close to the inside of the cab by using an adhesive.

[0019] The present invention has the following beneficial technical effects: The integrated composite cab structure of the present invention integrates the cab frame and the inner layer of the cab structure (cab interior) with the outer layer of the cab structure (cab hood), and adopts a composite sandwich structure to integrate the cab frame, cab interior and cab hood to form a composite cab structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings required for use in the embodiment will be briefly introduced below. Obviously, the drawings described below are only some implementation cases of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is an overall internal schematic diagram of the composite driver's cab structure of the present invention; Figure 2 for Figure 1Schematic diagram of the AA section; Figure 3 It is an overall internal schematic diagram of a composite driver's cab structure according to an embodiment of the present invention; Figure 4 for Figure 3 Schematic diagram of the BB section; Figure 5 for Figure 3 Schematic diagram of the CC cross section.

[0022] List of reference numerals: 1. Outer layer of cab structure; 2. Cab frame; 3. Inner layer of cab structure; 4. Cabin cavity for wiring of electrical equipment; 5. Middle layer of cab structure; 6. Chute; 7. Composite cab structure; 11. Outer layer of the cab structure; 22. Cab frame; 33. Inner layer of the cab structure; 44. Cabling cavity for electrical equipment; 55. Middle layer of the cab structure; 66. Slide; 101. Upper port; 102. Lower port; 103. Terminal block; 104. Top shielding area of ​​the cab; 105. Shielding area of ​​the operating console. DETAILED DESCRIPTION

[0023] The following is a further detailed description of the embodiments of the present disclosure in conjunction with the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present disclosure, but cannot be used to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

[0024] The present disclosure provides these embodiments to make the present disclosure thorough and complete, and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.

[0025] It should be noted that, in the description of the present disclosure, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0026] In addition, the words "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0027] It should also be noted that in the description of the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0028] All terms used in the present disclosure have the same meanings as those understood by those of ordinary skill in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, for example, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined as such herein.

[0029] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0030] Based on the above purpose, the first aspect of the embodiment of the present invention proposes as follows Figure 1-2 The integrated composite cab structure 7 shown in the figure has a window suitable for setting glass. The present invention integrates the cab frame 2 and the cab interior with the cab hood. The cab structure outer layer 1 is used as the cab hood, and the cab structure inner layer 3 is used as the cab interior. The cab frame 2 and the electrical equipment wiring cavity 4 are pre-buried between the cab structure outer layer 1 and the cab structure inner layer 3, and the cab structure middle layer 5 is filled in the empty space between the cab structure outer layer 1 and the cab structure inner layer 3. The slide 6 is arranged on the inner edge of the cab structure inner layer 3 and the top shielding area of ​​the control panel and the cab. The various parts of the cab structure are glued, and the overall structure thickness can be 50~100mm. The structure is optimized, the cab space is increased, and the problems of complex process and large adjustment workload during the cab structure installation process are solved.

[0031] The composite cab structure specifically comprises: a cab structure outer layer 1, a cab structure inner layer 3 and a cab frame 2. The cab structure outer layer 1, the cab structure inner layer 3 and the cab frame 2 are integrally solidified and formed.

[0032] The cab structure outer layer 1 is arranged on the outside of the cab and serves as a cab head cover; the material of the cab structure outer layer 1 is a fiber-reinforced composite material with high strength and good impact resistance, with a thickness of about 3 to 5 mm and a smooth outer surface.

[0033] The inner layer 3 of the cab structure is arranged inside the cab as the interior decoration of the cab; the material is a fiber-reinforced composite material with high strength and good impact resistance, with a thickness of about 3-5 mm, a smooth inner surface, and is spray-coated.

[0034] The cab frame 2 is embedded in the structure between the cab structure outer layer 1 and the cab structure inner layer 3. The cab frame 2 is a hollow tube with a wall thickness of 3 to 8 mm and a cross-sectional length of 40 to 80 mm. The cab frame 2 extends along the curved surface of the cab structure outer layer 1 in its length direction. The hollow tube can be a hollow square tube or a hollow circular tube. Figure 2 What is shown is a hollow circular tube. When the hollow tube is a hollow square tube, the side length of the hollow tube is 40~80mm; when the hollow tube is a hollow circular tube, the outer diameter of the hollow tube is 40~80mm. The material of the driver's cab frame 2 is stainless steel, aluminum alloy or a better fiber-reinforced composite material, the purpose is to ensure the structural rigidity of the driver's cab. The square tube or circular tube of the driver's cab frame 2 extends along the curved surface of the driver's cab hood, so that the driver's cab frame 2 can better fit the outer layer 1 of the driver's cab structure and increase the space of the driver's cab.

[0035] The composite cab structure also includes an electrical equipment wiring cavity 4 for placing the wiring harness required by the electrical equipment. The electrical equipment wiring cavity 4 is pre-buried in the structure between the cab structure outer layer 1 and the cab structure inner layer 3. The electrical equipment wiring cavity 4 is a hollow tube with a wall thickness of 1 to 2 mm and a cross-sectional length of 40 to 80 mm; and the electrical equipment wiring cavity 4 extends along the curved surface of the cab structure outer layer 1 in its length direction. The hollow tube can be a hollow square tube or a hollow circular tube. Figure 2 What is shown is a hollow square tube. When the hollow tube is a hollow square tube, the side length of the hollow tube is 40~80mm; when the hollow tube is a hollow round tube, the outer diameter of the hollow tube is 40~80mm. According to the wiring position and quantity, 1~3 electrical equipment wiring cavities 4 are set at specific positions between the outer layer 1 of the cab structure and the inner layer 3 of the cab structure. After the electrical equipment wiring cavity 4 is pre-buried, the wiring harness required for the electrical equipment can be inserted in advance, and terminal blocks are reserved at the upper and lower ports for easy wiring.

[0036] The electrical equipment wiring cavity 4 includes an upper port and a lower port for input and output of wires, and the upper port and the lower port pass through the inner layer 3 of the cab structure and communicate with the interior of the cab; wherein the upper port is located inside the middle roof of the cab and can be shielded by the middle roof of the cab; the lower port is located inside the operating console of the cab and can be shielded by the operating console. The exemplary positions of the upper port and the lower port can be referred to the following embodiments and Figure 3 .

[0037] The composite cab structure also includes a cab structure middle layer 5, which fills the space between the cab structure outer layer 1 and the cab structure inner layer 3 except the electrical equipment wiring cavity 4 and the cab frame 2. The cab structure middle layer 5 is made of lightweight sound insulation and heat insulation materials such as PET foam board or aramid paper honeycomb. The cab structure middle layer 5 has lightweight, sound insulation and heat insulation functions, and can completely replace the installation of cold-proof materials.

[0038] The composite cab structure also includes a slide groove 6, which is arranged on the inner layer 3 of the cab structure and is configured toward the inside of the cab for installation of the cab and other components. The slide grooves 6 are arranged at intervals along the edge of the inner layer 3 of the cab structure to facilitate the bolt connection and installation of the composite cab structure and the vehicle body; and a number of slide grooves 6 are also arranged at intervals at the corresponding positions of the inner layer 3 of the cab structure and the operating console and the middle top shielding area of ​​the cab for installation of the composite cab structure and the operating console and the equipment inside the middle top of the cab and the middle top of the cab. The material of the slide groove 6 is aluminum alloy or a better fiber-reinforced composite material. The slide groove 6 is arranged on the inner side of the cab structure to facilitate the installation of the cab structure and the vehicle body, as well as the installation of the operating console, the equipment inside the middle top of the cab and the middle top of the cab.

[0039] Fiber reinforced composite material is a high-performance material composed of high-strength fiber and matrix material. The fiber reinforced composite material is preferably selected from one of the following: glass fiber reinforced composite material (GFRP), carbon fiber reinforced composite material (CFRP), aramid fiber reinforced composite material (AFRP) and basalt fiber reinforced composite material (BFRP).

[0040] In a second aspect of the embodiment of the present invention, the various parts of the cab structure are formed by adhesive bonding and curing. The fiber-reinforced composite material is generally a layered structure, and the production process of the integrated composite cab structure includes: The driver's cab structure outer layer 1 is obtained by mold manufacturing, and the inner side of the driver's cab structure outer layer 1 is wetted with an adhesive; According to the design, the cab frame 2 and the electrical equipment wiring cavity 4 are arranged on the inner side of the cab structure outer layer 1, and then the cab structure middle layer 5 is used to fill the gap; The cab structure inner layer 3 is laminated from the inner side of the cab structure outer layer 1 to solidify the cab structure outer layer 1, the cab frame 2, the electrical equipment wiring cavity 4, the cab structure middle layer 5 and the cab structure inner layer 3; According to the design, the slide groove 6 is bonded to the inner side of the inner layer 3 of the cab structure close to the inside of the cab by using adhesive.

[0041] Compared with the traditional cab hood, the cab structure 3 has a smooth inner surface and can be directly used as the interior decoration of the cab, which can eliminate the complex process of interior design and production and installation of the cab; the cab frame 2 is pre-buried between the cab structure outer layer 1 and the cab structure inner layer 3, and the cab structure thickness is only 50-100 mm, which can increase the cab space; the electrical equipment wiring cavity 4 of the cab structure can solve the wiring problem of electrical equipment from the cab top to the cab console, and according to the design, the wiring harness required for the electrical equipment can be inserted into the electrical equipment wiring cavity 4 in advance, and terminal blocks are reserved at the upper and lower ports for easy wiring; the thickness of the cab structure middle layer 5 is 40-90 mm, and the appropriate thickness can be selected to replace the cold-proof material, eliminating the installation process of the cab cold-proof material; the arrangement of the slide 6 is convenient for the installation of the cab structure and the car body, as well as the installation of the console, the equipment in the cab middle top, and the cab middle top.

[0042] Example like Figure 3-5 As shown, a specific embodiment of the present invention is shown. The outer layer 11 of the cab structure is a 4.5mm thick glass fiber composite material with a smooth outer surface; the cab frame 22 is a stainless steel hollow round tube with a wall thickness of 5mm and a diameter of 40mm, formed by bending and welding; the inner layer 33 of the cab structure is a 4.5mm thick glass fiber composite material with a smooth inner surface, which is sprayed; the electrical equipment wiring cavity 44 is a hollow round tube with a wall thickness of 2mm, the upper port 101 of which is located in the top shielding area 104 of the cab, and the lower port 102 is located in the console shielding area 105, and the electrical equipment wiring is carried out in advance, respectively. Connected to the terminal block 103 at the upper port 101 and the lower port 102; the middle layer 55 of the cab structure is a PET foam board, filling the empty space between the outer layer 11 of the cab structure and the inner layer 33 of the cab structure; the slide groove 66 is made of aluminum alloy material, 17 slide grooves 66 are arranged on the edge of the inner layer of the cab structure for the installation and connection between the cab structure and the vehicle body, 6 slide grooves 66 are arranged in the cab middle top shielding area 104 for the installation of equipment inside the cab middle top and the cab middle top, and 6 slide grooves 66 are arranged in the console shielding area 105 for the installation of the console.

[0043] Beneficial technical effects that can be obtained by the present invention: (1) The composite cab structure in the technical solution of the present invention has a high degree of integration. The cab frame and the interior decoration of the cab do not need to be designed, produced and installed separately, which solves the problem of complex installation processes of various parts of the cab structure and improves the production and installation efficiency of the cab structure.

[0044] (2) The present invention pre-buries the driver's cab frame into the driver's cab hood, thereby reducing the distance between the driver's cab interior and the driver's cab hood and increasing the driver's cab space.

[0045] The above is an exemplary embodiment disclosed by the present invention, but it should be noted that, without departing from the scope disclosed by the embodiments of the present invention as defined in the claims, various changes and modifications may be made. In addition, although the elements disclosed by the embodiments of the present invention may be described or required in individual form, they may also be understood as multiple unless explicitly limited to the singular.

[0046] It should be understood that, as used herein, the singular forms "a", "an" are intended to include the plural forms as well, unless the context clearly supports an exception. It should also be understood that, as used herein, "and / or" refers to any and all possible combinations including one or more of the associated listed items.

[0047] The serial numbers of the embodiments disclosed in the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0048] A person skilled in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the disclosure of the embodiments of the present invention (including the claims) is limited to these examples; under the concept of the embodiments of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes in different aspects of the embodiments of the present invention as described above, which are not provided in detail for the sake of simplicity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.

Claims

1. An integrated composite cab structure, characterized in that: Include: The driver's cab structure outer layer is arranged on the outside of the driver's cab and serves as a driver's cab head cover; The inner layer of the driver's cab structure is arranged inside the driver's cab and serves as the interior decoration of the driver's cab; A cab frame, wherein the cab frame is pre-buried in a structure between an outer layer of the cab structure and an inner layer of the cab structure; The outer layer of the driver's cab structure, the inner layer of the driver's cab structure and the driver's cab frame are solidified and formed as a whole.

2. The composite cab structure according to claim 1, characterized in that: It also includes an electrical equipment wiring cavity for accommodating wiring harnesses required by the electrical equipment, and the electrical equipment wiring cavity is pre-buried in the structure between the outer layer of the driver's cab structure and the inner layer of the driver's cab structure.

3. The composite cab structure according to claim 2, characterized in that: It also includes a cab structure middle layer, which fills the space between the cab structure outer layer and the cab structure inner layer except the electrical equipment wiring cavity and the cab frame.

4. The composite cab structure according to claim 1, characterized in that: It also includes a slide groove, which is arranged on the inner layer of the driver's cab structure and is configured toward the interior of the driver's cab for installation of the driver's cab and other components.

5. The composite cab structure according to claim 1, characterized in that: The driver's cab frame is a hollow tube, the wall thickness of the hollow tube is 3-8 mm, and the cross-sectional length of the hollow tube is 40-80 mm; and the driver's cab frame extends along the curved surface of the outer layer of the driver's cab structure in its length direction.

6. The composite cab structure according to claim 2, characterized in that: The electrical equipment wiring cavity is a hollow tube, the wall thickness of the hollow tube is 1-2 mm, and the cross-sectional length of the hollow tube is 40-80 mm; and the electrical equipment wiring cavity extends along the curved surface of the outer layer of the driver's cab structure in its length direction.

7. The composite driver's cab structure according to claim 1, characterized in that: The thickness of the outer layer of the cab structure and the inner layer of the cab structure is 3-5 mm; the thickness of the cab structure is 50-100 mm.

8. The composite cab structure according to claim 2, characterized in that: The electrical equipment wiring cavity includes an upper port and a lower port for incoming and outgoing lines, and the upper port and the lower port pass through the inner layer of the driver's cab structure and are connected to the interior of the driver's cab; wherein the upper port is located inside the middle roof of the driver's cab and can be blocked by the middle roof of the driver's cab; the lower port is located inside the operating console of the driver's cab and can be blocked by the operating console.

9. The composite cab structure according to claim 4, characterized in that: The slide grooves are arranged at intervals along the edges of the inner layer of the cab structure to facilitate the bolt connection and installation of the composite cab structure and the vehicle body; and a number of slide grooves are also arranged at intervals at corresponding positions between the inner layer of the cab structure and the operating console and middle top shielding area of ​​the cab to be used for the installation of the composite cab structure, the operating console, the equipment inside the middle top of the cab, and the middle top of the cab.

10. A production process for the integrated composite cab structure according to any one of claims 1 to 9, characterized in that: include: The outer layer of the cab structure is obtained by mold manufacturing, and the inner side of the outer layer of the cab structure is wetted with an adhesive; According to the design, the cab frame and electrical equipment wiring cavity are arranged on the inner side of the outer layer of the cab structure, and then the middle layer of the cab structure is used to fill the gap; The inner layer of the cab structure is laminated from the inner side of the outer layer of the cab structure to solidify the outer layer of the cab structure, the cab frame, the electrical equipment wiring cavity, the middle layer of the cab structure and the inner layer of the cab structure; According to the design, the slide groove is bonded to the inner side of the inner layer of the cab structure close to the inside of the cab by using an adhesive.

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