Driver cab interior installation framework and driver cab steel structure

Abstract

The invention relates to a cab interior installation framework and a cab steel structure, the cab interior installation framework comprises cross beams, first longitudinal beams and second longitudinal beams, at least two cross beams are arranged side by side in parallel, a plurality of first cantilevers are arranged on the lower sides of the cross beams at intervals, and a plurality of first longitudinal beams are arranged between the adjacent cross beams at intervals; a plurality of second cantilevers are arranged on the lower sides of the first longitudinal beams, a plurality of second longitudinal beams are arranged on the side, away from other transverse beams, of at least one outermost transverse beam at intervals, the second longitudinal beams extend in the direction away from the transverse beams, and third cantilevers are arranged on the lower sides of the second longitudinal beams; the first cantilever, the second cantilever and the third cantilever are each provided with a first installation structure. According to the cab interior installation framework, the framework structure formed by connecting the cross beams and the longitudinal beams in the intersecting mode is adopted, an integral closed framework structure can be formed after the framework structure and a cab steel structure are welded, the rigidity is high enough, and noise generated by cab interior installation vibration in the locomotive running process can be effectively prevented.

Description

[0001] This application claims the priority of the Chinese patent application filed with the China Patent Office on November 7, 2024, with application number 202411582063.2 and invention name “A driver's cab interior installation frame and driver's cab steel structure”, all contents of which are incorporated by reference in this application. Technical Field

[0002] The invention relates to the technical field of rail locomotives, and in particular to a driver's cab interior mounting frame and a driver's cab steel structure. Background Art

[0003] Due to weight control reasons, the current locomotive cab interior is generally installed by unconnected brackets welded on the cab skin. For locomotives where the cab top is higher than the rail surface, the vertical distance between the cab top skin and the interior panel is large, so the cantilever of the interior mounting bracket is long, resulting in low bracket stiffness, which causes the interior to vibrate and generate noise during locomotive operation. Summary of the invention

[0004] The first object of the present invention is to provide a driver's cab interior mounting frame so that it has good rigidity and reduces the situation in which the interior vibration and noise are generated due to insufficient rigidity of the driver's cab interior mounting frame during locomotive operation.

[0005] The second object of the present invention is to provide a driver's cab steel structure that accommodates the above-mentioned driver's cab interior installation frame.

[0006] To achieve the above object, the present invention provides the following technical solutions: A driver's cab interior mounting frame, comprising: A crossbeam, at least two of which are arranged in parallel and side by side, and a plurality of first cantilevers are arranged at intervals on the lower side of the crossbeam along the length direction of the crossbeam; A first longitudinal beam, wherein a plurality of the first longitudinal beams are arranged between two adjacent transverse beams, two ends of the first longitudinal beam are respectively connected to two adjacent transverse beams, and a plurality of second cantilevers are arranged at intervals on the lower side of the first longitudinal beam along the length direction of the first longitudinal beam; A second longitudinal beam, wherein at least a plurality of the second longitudinal beams are arranged at intervals on a side of at least one of the outermost transverse beams away from the other transverse beams, one end of the second longitudinal beam is connected to one of the outermost transverse beams, the other end of the second longitudinal beam extends in a direction away from the transverse beam, and a plurality of third cantilevers are arranged at intervals on the lower side of the second longitudinal beam along the length direction of the second longitudinal beam; The first cantilever, the second cantilever and the third cantilever are respectively provided with a first mounting structure.

[0007] In one embodiment of the present application, the first longitudinal beam and the first cantilever are arranged in a one-to-one correspondence.

[0008] In one embodiment of the present application, a third longitudinal beam is further included, wherein the third longitudinal beam is arranged between at least one pair of adjacent two first longitudinal beams, and both ends of the third longitudinal beam are respectively connected to two adjacent cross beams, and a plurality of fourth cantilevers are arranged at intervals on the lower side of the third longitudinal beam along the length direction of the third longitudinal beam, and the fourth cantilever is provided with the first mounting structure.

[0009] In one embodiment of the present application, the cross-sectional shape of the cross beam, the first longitudinal beam, the second longitudinal beam and the third longitudinal beam is L-shaped.

[0010] In one embodiment of the present application, second mounting structures are arranged at intervals on the upper side of the beam along the length direction of the beam.

[0011] In one embodiment of the present application, the second mounting structure includes a first Z-shaped bending member and a first reinforcing rib plate, the first Z-shaped bending member includes two first vertical plates and a first horizontal plate connected between the two first vertical plates, and the first reinforcing rib plate is connected to the first horizontal plate and at least one of the first vertical plates.

[0012] In one embodiment of the present application, the first mounting structure is a vertical strip hole.

[0013] In one embodiment of the present application, it also includes a mounting bracket, which is arranged on the inner wall of the partition wall of the steel structure of the driver's cab, and the mounting bracket includes a connecting plate and two third mounting structures, and the third mounting structure includes a second Z-shaped bending member and a second reinforcing rib plate, and the second Z-shaped bending member includes two second horizontal plates and a second vertical plate connected between the two second horizontal plates, and the second reinforcing rib plate is respectively connected to the two second horizontal plates and the vertical plate, and the two ends of the connecting plate are respectively connected to the second horizontal plates of the two second Z-shaped bending members.

[0014] In one embodiment of the present application, it also includes a first mounting plate, which is arranged on one side of the interior mounting frame of the driver's cab along the length direction of the first longitudinal beam of the interior mounting frame of the driver's cab, and the first mounting plate is arranged on the inner wall of the side wall of the steel structure of the driver's cab, and the first mounting plate is provided with a transverse strip hole.

[0015] In one embodiment of the present application, it also includes a second mounting plate, which is arranged on one side of the driver's cab interior mounting frame along the length direction of the longitudinal beam of the driver's cab interior mounting frame, and the second mounting plate includes a lateral extension portion and a vertical extension portion that are connected to each other in an L shape, and one end of the lateral extension portion away from the vertical extension portion is connected to the inner wall of the side wall, and the vertical extension portion is provided with a vertical strip hole.

[0016] A driver's cab steel structure, wherein a driver's cab interior mounting frame as described in any one of claims 1 to 10 is arranged in the driver's cab steel structure, and the driver's cab interior mounting frame is connected to the driver's cab steel structure to form a frame structure.

[0017] In one embodiment of the present application, the driver's cab steel structure includes a ceiling, a partition wall, a front wall and two side walls, the ceiling is connected to the partition wall, the two side walls are arranged opposite to each other, and the two side walls are respectively connected to the ceiling, the partition wall and the front wall.

[0018] It can be seen from the above technical scheme that the present invention discloses a driver's cab interior mounting frame, which includes a crossbeam, a first longitudinal beam and a second longitudinal beam, wherein at least two of the crossbeams are arranged side by side in parallel, and a plurality of first cantilevers are arranged at intervals on the lower side of the crossbeam along the length direction of the crossbeam, and a plurality of first longitudinal beams are arranged at intervals between two adjacent crossbeams, and both ends of the first longitudinal beam are respectively connected to the two adjacent crossbeams, and a plurality of second cantilevers are arranged at intervals on the lower side of the first longitudinal beam along the length direction of the first longitudinal beam, and a plurality of second longitudinal beams are arranged at intervals on at least one side of the outermost crossbeam away from the other crossbeams, one end of the second longitudinal beam is connected to one of the outermost crossbeams, and the other end of the second longitudinal beam extends in a direction away from the crossbeam, and a plurality of third cantilevers are arranged at intervals on the lower side of the second longitudinal beam along the length direction of the second longitudinal beam; and first mounting structures are respectively provided on the first cantilever, the second cantilever and the third cantilever.

[0019] The above-mentioned driver's cab interior installation frame adopts a frame structure composed of intersecting cross beams and longitudinal beams. After welding this driver's cab interior installation frame and the driver's cab steel structure, an integral closed frame structure can be formed. It has sufficiently high rigidity and can effectively prevent the driver's cab interior from vibrating and generating noise during the operation of the locomotive. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments 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 A schematic diagram of the structure of the interior installation framework of the driver's cab provided by an embodiment of the present invention; Figure 2 A schematic diagram of the structure of the driver's cab steel structure provided by an embodiment of the present invention; Figure 3 A schematic diagram of a structure in which a driver's cab interior installation frame and a driver's cab steel structure are combined into a whole according to an embodiment of the present invention; Figure 4 A schematic structural diagram of a mounting bracket for an in-cab mounting frame provided in an embodiment of the present invention.

[0022] in: 1 is the installation frame of the driver's cab; 101 is the crossbeam; 102 is the first cantilever; 103 is the first longitudinal beam; 104 is the second cantilever; 105 is the second longitudinal beam; 106 is the third cantilever; 107 is the third longitudinal beam; 108 is the fourth cantilever; 109 is the first Z-shaped bending member; 110 is the first reinforcing rib plate; 2 is the steel structure of the driver's cab; 201 is the ceiling; 202 is the partition wall; 203 is the side wall; 204 is the front wall; 3 is a mounting bracket; 301 is a connecting plate; 302 is a second Z-shaped bending member; 303 is a second reinforcing rib plate; 4 is a first mounting plate; 5 is a second mounting plate. DETAILED DESCRIPTION

[0023] One of the cores of the present invention is to provide a driver's cab interior mounting frame, the structural design of which has good rigidity, thereby reducing the situation in which interior vibration and noise are generated due to insufficient rigidity of the driver's cab interior mounting frame during locomotive operation.

[0024] Another core of the present invention is to provide a driver's cab steel structure that accommodates the above-mentioned driver's cab interior installation frame.

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figure 1 , Figure 1 A schematic diagram of the structure of the interior installation framework of the driver's cab provided by an embodiment of the present invention.

[0027] The embodiment of the present invention discloses a driver's cab interior installation frame 1 including a cross beam 101 , a first longitudinal beam 103 and a second longitudinal beam 105 .

[0028] Among them, at least two beams 101 are arranged side by side in parallel, and a plurality of first cantilevers 102 are arranged at intervals on the lower side of the beam 101 along the length direction of the beam 101. The first cantilever 102 and the beam 101 are integrally formed, or the first cantilever 102 and the beam 101 are welded and connected, or the first cantilever 102 and the beam 101 can be connected in a detachable manner. In a specific embodiment of the present application, the first cantilever 102 and the beam 101 are integrally formed.

[0029] A plurality of first longitudinal beams 103 are arranged at intervals between two adjacent transverse beams 101, and both ends of the first longitudinal beam 103 are respectively connected to the two adjacent transverse beams 101, and a plurality of second cantilevers 104 are arranged at intervals on the lower side of the first longitudinal beam 103 along the length direction of the first longitudinal beam 103, and a plurality of second longitudinal beams 105 are arranged at intervals on at least one side of the outermost transverse beams 101 away from the other transverse beams 101, one end of the second longitudinal beam 105 is connected to one of the outermost transverse beams 101, and the other end of the second longitudinal beam 105 extends in a direction away from the transverse beam 101, and a plurality of third cantilevers 106 are arranged at intervals on the lower side of the second longitudinal beam 105 along the length direction of the second longitudinal beam 105; a first mounting structure is respectively provided on the first cantilever 102, the second cantilever 104 and the third cantilever 106.

[0030] It can be seen that, compared with the prior art, the interior mounting frame 1 of the driver's cab provided by the embodiment of the present invention adopts a frame structure formed by the cross beam 101 and the longitudinal beam intersecting and connecting. Figures 1 to 3As shown, the interior mounting frame 1 of the driver's cab can form an integral closed frame structure after being welded to the steel structure 2 of the driver's cab. When welding to the steel structure 2 of the driver's cab, both ends and the upper side of the cross beam 101 and the end of the second longitudinal beam 105 are welded to the inner wall of the steel structure 2 of the driver's cab. In this way, the interior mounting frame 1 of the driver's cab and the steel structure 2 of the driver's cab can support and fix each other, thereby having sufficiently high rigidity, which can effectively prevent the interior vibration of the driver's cab from generating noise during the operation of the locomotive.

[0031] like Figure 1 As shown, in one embodiment of the present application, the first longitudinal beam 103 and the first cantilever 102 are arranged in a one-to-one correspondence, that is, the connection position between the first longitudinal beam 103 and the cross beam 101 is the position where the cross beam 101 is provided with the first cantilever 102, thereby increasing the support strength here.

[0032] like Figure 1 As shown, in order to further improve the strength of the interior mounting frame 1 of the driver's cab, the interior mounting frame 1 of the driver's cab also includes a third longitudinal beam 107, and the third longitudinal beam 107 is arranged between at least one pair of adjacent first longitudinal beams 103, and the two ends of the third longitudinal beam 107 are respectively connected to the two adjacent cross beams 101, and a plurality of fourth cantilevers 108 are arranged at intervals on the lower side of the third longitudinal beam 107 along the length direction of the third longitudinal beam 107, and the fourth cantilever 108 is provided with a first mounting structure.

[0033] In order to ensure the strength of the cross beam 101, the first longitudinal beam 103, the second longitudinal beam 105 and the third longitudinal beam 107 while reducing the weight, in one embodiment of the present application, the cross-sectional shape of the cross beam 101, the first longitudinal beam 103, the second longitudinal beam 105 and the third longitudinal beam 107 is L-shaped. Of course, it should be noted that the cross-sectional shape of the cross beam 101, the first longitudinal beam 103, the second longitudinal beam 105 and the third longitudinal beam 107 is not limited to L-shape. In other embodiments, other methods can also be used to improve the strength of the cross beam 101, the first longitudinal beam 103, the second longitudinal beam 105 and the third longitudinal beam 107.

[0034] like Figure 1 As shown, second mounting structures are arranged at intervals on the upper side of the cross beam 101 along the length direction of the cross beam 101 , and the second mounting structures are used to be connected to the ceiling 201 of the steel structure 2 of the driver's cab.

[0035] Specifically, the second mounting structure includes a first Z-shaped bending member 109 and a first reinforcing rib plate 110. Figure 1 As shown, the first Z-shaped bending member 109 includes two first vertical plates and a first horizontal plate connected between the two first vertical plates, and the first reinforcing rib plate 110 is connected to the first horizontal plate and at least one first vertical plate.

[0036] In one embodiment of the present application, the first mounting structure is a vertical strip hole, and the length direction of the vertical strip hole extends vertically upward.

[0037] like Figure 3 As shown, the driver's cab interior mounting frame also includes one or more mounting brackets 3, which are arranged on the inner side wall of the partition wall 202 of the driver's cab steel structure 2. The mounting bracket 3 includes a connecting plate 301 and two third mounting structures, such as Figure 4 As shown, the third mounting structure includes a second Z-shaped bending member 302 and a second reinforcing rib plate 303. The second Z-shaped bending member 302 includes two second horizontal plates and a second vertical plate connected between the two second horizontal plates. The second reinforcing rib plate 303 is respectively connected to the two second horizontal plates and the vertical plate. The two ends of the connecting plate 301 are respectively connected to the second horizontal plates of the two second Z-shaped bending members 302. The lower surface of the mounting bracket 3 is used to bond a buckle, which is used in conjunction with a buckle bonded to the driver's cab mounting plate to ensure that the mating surface of the driver's cab mounting plate does not sag.

[0038] like Figure 3 As shown, the interior mounting frame of the driver's cab also includes a first mounting plate 4, which is arranged on one side of the interior mounting frame of the driver's cab along the length direction of the first longitudinal beam 103 of the interior mounting frame of the driver's cab, and the first mounting plate 4 is arranged on the inner wall of the side wall 203. At least one transverse strip hole is arranged on the first mounting plate 4, and the length direction of the transverse strip hole is horizontal, which is used to adjust the transverse installation position of the interior mounting plate of the driver's cab.

[0039] like Figure 3 As shown, the interior mounting frame of the driver's cab also includes a second mounting plate 5, which is arranged on one side of the interior mounting frame of the driver's cab along the length direction of the first longitudinal beam 103 of the interior mounting frame of the driver's cab, and the second mounting plate 5 includes a lateral extension portion and a vertical extension portion which are connected to each other in an L shape, and one end of the lateral extension portion away from the vertical extension portion is connected to the inner wall of the side wall 203, and the vertical extension portion is provided with at least one vertical strip hole for adjusting the vertical installation position of the interior mounting plate of the driver's cab.

[0040] See also Figure 3 , Figure 3 A schematic structural diagram of a driver's cab interior installation frame and a driver's cab steel structure combined as a whole provided in an embodiment of the present invention.

[0041] The embodiment of the present application also provides a driver's cab steel structure 2, in which a driver's cab interior mounting frame 1 as described in the above embodiment is arranged, and the driver's cab interior mounting frame 1 is connected to the driver's cab steel structure 2 to form a frame structure, wherein the driver's cab steel structure 2 is in the shape of a hood, that is, it is closed in the circumference and at one end, and the other end is connected to the locomotive underframe to form a closed structure. Since the above-mentioned driver's cab interior mounting frame 1 is arranged in the driver's cab steel structure 2, please refer to the above embodiment for the technical effect of the driver's cab steel structure 2.

[0042] like Figure 2 As shown, in one embodiment of the present application, the driver's cab steel structure 2 includes a ceiling 201, a partition wall 202, a front wall 204 and two side walls 203, the ceiling 201 is connected to the partition wall 202, the two side walls 203 are arranged opposite to each other, and the two side walls 203 are respectively connected to the ceiling 201, the partition wall 202 and the front wall 204.

[0043] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0044] It should be understood that the use of "system", "device", "unit" and / or "module" in this application is only a method for distinguishing different components, elements, parts, parts or assemblies at different levels. However, if other words can achieve the same purpose, the word can be replaced by other expressions.

[0045] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "a kind" and / or "the" do not refer to the singular, but also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements. The elements defined by the sentence "includes a..." do not exclude the existence of other identical elements in the process, method, commodity or device that includes the elements.

[0046] In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0047] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0048] If a flow chart is used in the present application, the flow chart is used to illustrate the operations performed by the system according to the embodiment of the present application. It should be understood that the preceding or following operations are not necessarily performed accurately in order. On the contrary, each step can be processed in reverse order or simultaneously. At the same time, other operations can also be added to these processes, or a certain step or several steps of operations can be removed from these processes.

[0049] It should also be noted that, in this article, terms such as "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that an article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such articles or devices. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the article or device including the above elements.

[0050] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A driver's cab interior installation frame, characterized in that: include: A crossbeam, at least two of which are arranged in parallel and side by side, and a plurality of first cantilevers are arranged at intervals on the lower side of the crossbeam along the length direction of the crossbeam; A first longitudinal beam, wherein a plurality of the first longitudinal beams are arranged between two adjacent transverse beams, two ends of the first longitudinal beam are respectively connected to two adjacent transverse beams, and a plurality of second cantilevers are arranged at intervals on the lower side of the first longitudinal beam along the length direction of the first longitudinal beam; A second longitudinal beam, wherein at least a plurality of the second longitudinal beams are arranged at intervals on a side of at least one of the outermost transverse beams away from the other transverse beams, one end of the second longitudinal beam is connected to one of the outermost transverse beams, the other end of the second longitudinal beam extends in a direction away from the transverse beam, and a plurality of third cantilevers are arranged at intervals on the lower side of the second longitudinal beam along the length direction of the second longitudinal beam; The first cantilever, the second cantilever and the third cantilever are respectively provided with a first mounting structure.

2. The driver's cab interior mounting frame according to claim 1, characterized in that: The first longitudinal beams are arranged in one-to-one correspondence with the first cantilevers.

3. The driver's cab interior mounting frame according to claim 1, characterized in that: It also includes a third longitudinal beam, which is arranged between at least a pair of adjacent two first longitudinal beams, and the two ends of the third longitudinal beam are respectively connected to the two adjacent cross beams. A plurality of fourth cantilevers are arranged at intervals on the lower side of the third longitudinal beam along the length direction of the third longitudinal beam, and the fourth cantilever is provided with the first mounting structure.

4. The driver's cab interior mounting frame according to claim 3, characterized in that: The cross-sectional shape of the cross beam, the first longitudinal beam, the second longitudinal beam, and the third longitudinal beam is L-shaped.

5. The driver's cab interior mounting frame according to any one of claims 1 to 4, characterized in that: Second mounting structures are arranged at intervals on the upper side of the crossbeam along the length direction of the crossbeam.

6. The driver's cab interior mounting frame according to claim 5, characterized in that: The second mounting structure includes a first Z-shaped bending member and a first reinforcing rib plate, the first Z-shaped bending member includes two first vertical plates and a first horizontal plate connected between the two first vertical plates, and the first reinforcing rib plate is connected to the first horizontal plate and at least one of the first vertical plates.

7. The driver's cab interior mounting frame according to any one of claims 1 to 4, characterized in that: The first mounting structure is a vertical strip hole.

8. The driver's cab interior mounting frame according to any one of claims 1 to 4, characterized in that: It also includes a mounting bracket, which is arranged on the inner wall of the partition wall of the steel structure of the driver's cab, and the mounting bracket includes a connecting plate and two third mounting structures, and the third mounting structure includes a second Z-shaped bending member and a second reinforcing rib plate, and the second Z-shaped bending member includes two second horizontal plates and a second vertical plate connected between the two second horizontal plates, and the second reinforcing rib plate is respectively connected to the two second horizontal plates and the vertical plate, and the two ends of the connecting plate are respectively connected to the second horizontal plates of the two second Z-shaped bending members.

9. The driver's cab interior mounting frame according to any one of claims 1 to 4, characterized in that: It also includes a first mounting plate, which is arranged on one side of the interior mounting frame of the driver's cab along the length direction of the first longitudinal beam of the interior mounting frame of the driver's cab, and the first mounting plate is arranged on the inner wall of the side wall of the steel structure of the driver's cab, and the first mounting plate is provided with a transverse strip hole.

10. The driver's cab interior mounting frame according to any one of claims 1 to 4, characterized in that: It also includes a second mounting plate, which is arranged on one side of the driver's cab interior mounting frame along the length direction of the longitudinal beam of the driver's cab interior mounting frame. The second mounting plate includes a lateral extension portion and a vertical extension portion that are connected to each other in an L shape. One end of the lateral extension portion away from the vertical extension portion is connected to the inner wall of the side wall, and the vertical extension portion is provided with a vertical strip hole.

11. A driver's cab steel structure, characterized in that: The driver's cab steel structure is provided with a driver's cab interior mounting frame as described in any one of claims 1 to 10, and the driver's cab interior mounting frame is connected to the driver's cab steel structure to form a frame structure.

12. The driver's cab steel structure according to claim 11, characterized in that: The driver's cab steel structure includes a ceiling, a partition wall, a front wall and two side walls. The ceiling is connected to the partition wall, the two side walls are arranged opposite to each other, and the two side walls are respectively connected to the ceiling, the partition wall and the front wall.

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