Wagon body and machining method therefor

Abstract

The present application provides a wagon body and a machining method therefor. The wagon body comprises: an underframe, comprising cross beams, a longitudinal beam, and a floor plate, wherein the cross beams and the longitudinal beam are arranged in a staggered manner on the floor plate; side walls located at side portions of the underframe, each side wall comprising a side plate and side columns arranged on the side plate, the side columns extending in the vertical direction, the lower end of the side plate being riveted to a side portion of the floor plate, and the lower ends of the side columns being welded to the cross beams; and end walls located at end portions of the underframe, each end wall comprising an end plate and a vertical column arranged on the end plate, the vertical column extending in the vertical direction, the lower end of the end plate being riveted to an end portion of the floor plate, side portions of the end plate being riveted to the side plates, and the vertical column being welded to the longitudinal beam. By means of the technical solution provided in the present application, the problem in the related art that wagon body welding fails to meet requirements can be solved.

Description

Vehicle body and processing method thereof

[0001] The present application claims priority to the patent application No. 202411268797.3, filed on September 10, 2024, with the State Intellectual Property Office of China, and entitled "Vehicle body and processing method thereof". TECHNICAL FIELD

[0002] The present application relates to the technical field of transportation tools, in particular, to a vehicle body and a processing method thereof. BACKGROUND

[0003] The vehicle body structure of a railway open wagon is mainly composed of a chassis, side walls, end walls and other large components. Most of the vehicle body structures of railway wagons are entirely connected by welding, that is, the chassis, side walls, end walls and other large components are first assembled and welded, and then the large components are assembled and welded into a vehicle body. In order to meet the requirements of local production of users, some railway wagon products are delivered in the form of large components rather than complete vehicles, that is, the chassis, side walls, end walls and other large components are manufactured and shipped to the user, and then assembled into a vehicle body at the user's site. The current large component assembly scheme is all welding schemes.

[0004] However, the large component welding scheme at the user's site has many shortcomings. Since railway wagons are large equipment, large-scale turnover equipment is usually required for large component assembly and welding, and the welding scheme has problems such as large welding workload and the need for more high-level welders, resulting in low assembly efficiency and high manufacturing cost when assembling the vehicle body components. In addition, a large amount of smoke and dust is generated during welding, which is difficult to recover and can easily pollute the environment and harm the health of assembly personnel. SUMMARY

[0005] The present application provides a vehicle body and a processing method thereof to solve the problem that the welding of the vehicle body in the related art cannot meet the requirements.

[0006] According to one aspect of the present application, a vehicle body is provided, which comprises: a chassis comprising a cross beam, a longitudinal beam and a bottom plate, the cross beam and the longitudinal beam being arranged alternately on the bottom plate; a side wall located at a side of the chassis, the side wall comprising a side plate and a side column arranged on the side plate, the side column extending vertically, a lower end of the side plate being riveted to a side of the bottom plate, and a lower end of the side column being welded to the cross beam; and an end wall located at an end of the chassis, the end wall comprising an end plate and a vertical column arranged on the end plate, the vertical column extending vertically, a lower end of the end plate being riveted to an end of the bottom plate, a side of the end plate being riveted to the side plate, and the vertical column being welded to the longitudinal beam.

[0007] Further, the bottom plate comprises a bottom plate body and a bottom folding plate connected to a side of the bottom plate body, the side plate comprises a side plate body and a side folding plate connected to a lower end of the side plate body, the side folding plate and the bottom folding plate are both located on an inner side of the side plate body, and the bottom folding plate and the side folding plate are riveted.

[0008] Further, the bottom fold plate comprises a first vertical plate and a first connecting plate, the side fold plate comprises a second vertical plate and a second connecting plate, the lower end of the first connecting plate is connected with the bottom plate body, the first vertical plate is connected with the upper end of the first connecting plate, the upper end of the second connecting plate is connected with the side plate body, the second vertical plate is connected with the lower end of the second connecting plate, the first vertical plate and the second vertical plate are vertically stacked and riveted.

[0009] Further, the first connecting plate and the second connecting plate are inclinedly arranged, or the first connecting plate and the second connecting plate are arc-shaped plates.

[0010] Further, the side column is located at the inner side of the side plate, the bottom plate has a through arranged avoiding hole, and the side column is welded with the cross beam through the avoiding hole.

[0011] Further, the outer wall of the side column is provided with a column reinforcing plate, the column reinforcing plate is located above the bottom plate and covers the avoiding hole, and the lower surface of the column reinforcing plate is connected with the upper surface of the bottom plate.

[0012] Further, the column reinforcing plate comprises a first reinforcing plate, a shielding plate and a second reinforcing plate which are sequentially connected from top to bottom and arranged at an angle, the inner wall of the first reinforcing plate is connected with the outer wall of the side column, the shielding plate covers the avoiding hole, and the second reinforcing plate is connected with the bottom plate.

[0013] Further, the side plate comprises a side plate body and a corner fold plate arranged at the corner of the side of the side plate body, the corner fold plate extends vertically, and the side of the end plate is riveted with the corner fold plate.

[0014] Further, the vehicle body further comprises a corner connecting plate, and the corner connecting plate is connected with the side wall and the end wall respectively.

[0015] Further, the side wall further comprises a side beam arranged at the upper end of the side plate, the end wall further comprises an end beam arranged at the upper end of the end plate, the corner connecting plate comprises a first L-shaped plate and a second L-shaped plate which are connected, the first L-shaped plate is connected with the side plate and the end plate respectively, and the second L-shaped plate is connected with the side beam and the end beam respectively.

[0016] Further, the bottom plate comprises a bottom plate body and an end fold plate connected at the end of the bottom plate body, and the upper end of the end fold plate is riveted with the lower end of the end plate.

[0017] Further, the vertical column is located at the outer side of the end fold plate, the lower end of the vertical column protrudes from the lower surface of the bottom plate, the end of the longitudinal beam protrudes from the bottom plate, and the lower end of the vertical column is connected with the part of the longitudinal beam protruding from the bottom plate; and / or, the bottom plate further comprises an end reinforcing plate which is arranged obliquely, the upper end of the end reinforcing plate is connected with the end fold plate, and the lower end of the end reinforcing plate is connected with the bottom plate.

[0018] According to another aspect of the present application, a vehicle body processing method is provided for processing the vehicle body provided above, the vehicle body processing method comprising: obtaining a chassis, side walls, end walls and corner connecting plates; fixing the chassis on an assembly table; fixing two side walls on the chassis by using a first set of tools and pre-connecting the side walls and the chassis; fixing two end walls on the chassis by using a second set of tools, adjusting the end walls so that the height of the end walls is the same as the height of the side walls; checking the size of the vehicle body and adjusting the positions of the end walls and the side walls according to the checking result; pre-connecting the end walls and the side walls by using the corner connecting plates according to the positions of the end walls and the side walls, and pre-connecting the corner folding plates to the side walls; marking the positions of the rivet holes of the end plates of the end walls and the side plates of the side walls according to the positions of the rivet holes of the bottom plate of the chassis; disassembling the end walls and the side walls from the chassis; welding the corner folding plates to the side walls and processing the rivet holes on the side plates and the end plates; fixing two side walls on the chassis by using the first set of tools and fixing two end walls on the chassis by using the second set of tools; riveting the bottom plate of the chassis and the side plates of the side walls, the bottom plate of the chassis and the end plates of the end walls, and the end plates of the end walls and the side plates of the side walls; and welding the side columns and the cross beams of the side walls, and the vertical columns of the end walls and the longitudinal beams of the chassis.

[0019] By using the technical solution of the present application, the vehicle body comprises a chassis, side walls and end walls, after the chassis, the side walls and the end walls are processed and transported to an assembly site, the chassis is placed on an assembly table, the side walls and the end walls are respectively placed on the chassis, and the relative positions of the side walls and the end walls are adjusted to meet the size requirements of the vehicle body, the bottom plate is riveted to the side plates and the end plates, the side columns are welded to the cross beams, and the vertical columns are welded to the longitudinal beams, so that the assembly of the vehicle body is completed. Compared with the mode of welding the chassis, the side walls and the end walls together, a large-scale overturning device is not needed, the welding workload is greatly reduced, the long weld joint between the bottom plate and the side plate is omitted, a large number of welders are not needed, environmental pollution is reduced, and manufacturing cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings, which form a part of the present application, are used to provide further understanding of the present application, and the illustrative embodiments of the present application and their description are used to explain the present application, and do not constitute improper limitations to the present application. In the drawings:

[0021] FIG. 1 shows a structural schematic view of a vehicle body provided according to an embodiment of the present application;

[0022] FIG. 2 shows a partial enlarged view of A in FIG. 1;

[0023] FIG. 3 shows a partial enlarged view of B in FIG. 1;

[0024] FIG. 4 shows a partial sectional view of a vehicle body provided according to an embodiment of the present application;

[0025] FIG. 5 shows a structural schematic view of a chassis of a vehicle body provided according to an embodiment of the present application;

[0026] Fig. 6 shows a structural schematic diagram of a side wall of a vehicle body according to an embodiment of the present application;

[0027] Fig. 7 shows a structural schematic diagram of an end wall of a vehicle body according to an embodiment of the present application.

[0028] In the above drawings, the following reference signs are used: 10, underframe; 11, cross beam; 12, longitudinal beam; 13, bottom plate; 131, bottom plate body; 132, bottom folding plate; 133, first vertical plate; 134, first connecting plate; 135, end folding plate; 136, end reinforcing plate; 20, side wall; 21, side plate; 211, side plate body; 212, side folding plate; 213, second vertical plate; 214, second connecting plate; 215, corner folding plate; 22, side column; 221, column reinforcing plate; 222, first reinforcing plate; 223, shielding plate; 224, second reinforcing plate; 30, end wall; 31, end plate; 32, vertical column; 40, corner connecting plate; 41, first L-shaped plate; 42, second L-shaped plate. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. The following description of at least one exemplary embodiment is merely illustrative in nature and not intended to be limiting on the application or its applications or uses. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of the present application.

[0030] As shown in Figs. 1 to 7, the present application provides a vehicle body, which comprises an underframe 10, a side wall 20 and an end wall 30. The underframe 10 comprises cross beams 11, longitudinal beams 12 and a bottom plate 13, and the cross beams 11 and the longitudinal beams 12 are staggered on the bottom plate 13. The side wall 20 is located at the side of the underframe 10, and the side wall 20 comprises a side plate 21 and a side column 22 arranged on the side plate 21. The side column 22 extends vertically, the lower end of the side plate 21 is riveted to the side of the bottom plate 13, and the lower end of the side column 22 is welded to the cross beam 11. The end wall 30 is located at the end of the underframe 10, and the end wall 30 comprises an end plate 31 and a vertical column 32 arranged on the end plate 31. The vertical column 32 extends vertically, the lower end of the end plate 31 is riveted to the end of the bottom plate 13, the side of the end plate 31 is riveted to the side plate 21, and the vertical column 32 is welded to the longitudinal beam 12.

[0031] According to the technical scheme, the vehicle body includes the chassis 10, the side walls 20 and the end walls 30, the chassis 10, the side walls 20 and the end walls 30 are processed and transported to an assembling site, the chassis 10 is placed on an assembling table, the side walls 20 and the end walls 30 are placed on the chassis 10 respectively, the relative positions of the side walls 20 and the end walls 30 are adjusted to meet the size requirement of the vehicle body, the bottom plate 13 is riveted to the side plate 21 and the end plate 31 respectively, the side column 22 is welded to the cross beam 11, and the vertical column 32 is welded to the longitudinal beam 12, so that the assembling of the vehicle body is completed. Compared with the welding mode of the chassis 10, the side walls 20 and the end walls 30, the large-scale overturning equipment is not needed, the welding workload is greatly reduced, the long welding seam between the bottom plate 13 and the side plate 21 is omitted, a large number of welders are not needed, the environmental pollution is reduced, and the manufacturing cost is reduced.

[0032] The side walls 20 and the end walls 30 are both two, the two side walls 20 are located at two sides of the chassis 10, and the two end walls 30 are located at two ends of the chassis 10.

[0033] As shown in FIG. 4, the bottom plate 13 includes a bottom plate body 131 and a bottom folding plate 132 connected to a side of the bottom plate body 131, the side plate 21 includes a side plate body 211 and a side folding plate 212 connected to a lower end of the side plate body 211, the side folding plate 212 and the bottom folding plate 132 are both located on an inner side of the side plate body 211, and the bottom folding plate 132 and the side folding plate 212 are riveted. The above structure has the advantages of simple structure and convenient operation.

[0034] In the embodiment, the two sides of the bottom plate 13 are both provided with the bottom folding plate 132, and the two side plates 21 both include the side folding plate 212.

[0035] The bottom folding plate 132 and the side folding plate 212 can be provided as a plate body structure with only one bending or a plate body structure with multiple bendings. When there is only one bending, the rivet extends obliquely, which can increase the volume of the vehicle body. When there are multiple bendings, the rivet extends horizontally, which is convenient to operate.

[0036] In addition, since the side folding plate 212 and the bottom folding plate 132 are both located on the inner side of the side plate body 211, the clearance can be avoided, so that the connection quality of the vehicle body is ensured when the vehicle body has a large volume.

[0037] As shown in FIG. 4, the bottom folding plate 132 comprises a first vertical plate 133 and a first connecting plate 134, the side folding plate 212 comprises a second vertical plate 213 and a second connecting plate 214, the lower end of the first connecting plate 134 is connected with the bottom plate body 131, the first vertical plate 133 is connected with the upper end of the first connecting plate 134, the upper end of the second connecting plate 214 is connected with the side plate body 211, the second vertical plate 213 is connected with the lower end of the second connecting plate 214, and the first vertical plate 133 and the second vertical plate 213 are vertically stacked and riveted. With the above structure, the first vertical plate 133 and the second vertical plate 213 are vertically extended by the first connecting plate 134 and the second connecting plate 214, the rivet can be arranged horizontally, and the riveting operation is facilitated.

[0038] In the above structure, the first connecting plate 134 and the second connecting plate 214 are inclined, or the first connecting plate 134 and the second connecting plate 214 are arc-shaped plates. With the above structure, the processing is facilitated.

[0039] In addition, the side plate lower bending structure improves the rigidity of the side plate, and can reduce the deformation of the side plate to the outside of the vehicle body.

[0040] As shown in FIG. 1 and FIG. 5, the side column 22 is located on the inner side of the side plate 21, the bottom plate 13 has a through hole, and the side column 22 is welded and connected with the cross beam 11 through the hole. With the above structure, the connection strength of the side column 22 and the cross beam 11 can be ensured when the vehicle body has a large volume.

[0041] In the embodiment, the cross beam 11 and the longitudinal beam 12 are located on the lower surface of the bottom plate 13.

[0042] As shown in FIG. 2, the outer wall of the side column 22 is provided with a column reinforcing plate 221, the column reinforcing plate 221 is located above the bottom plate 13 and covers the hole, and the lower surface of the column reinforcing plate 221 is connected with the upper surface of the bottom plate 13. The hole is blocked by the column reinforcing plate 221, which can prevent leakage of the vehicle body.

[0043] As shown in FIG. 2, the column reinforcing plate 221 comprises a first reinforcing plate 222, a shielding plate 223 and a second reinforcing plate 224 which are connected in sequence from top to bottom and arranged at an angle, the inner wall of the first reinforcing plate 222 is connected with the outer wall of the side column 22, the shielding plate 223 covers the hole, and the second reinforcing plate 224 is connected with the bottom plate 13. With the above column reinforcing plate 221, the connection strength with the side column 22 can be enhanced by the first reinforcing plate 222, and the connection strength with the bottom plate 13 can be enhanced by the second reinforcing plate 224.

[0044] In the above structure, the shielding plate 223 is inclined, the right angle connection is eliminated, and the material accumulation is not easy to clean.

[0045] As shown in Fig. 6, the side plate 21 comprises a side plate body 211 and a corner flange 215 arranged at a corner of a side of the side plate body 211, the corner flange 215 extends vertically, and a side of the end plate 31 is riveted to the corner flange 215. With the side plate 21 having the above structure, the side plate body 211 and the end plate 31 can be connected by the corner flange 215.

[0046] The corner flange 215 can be a flat plate with one bending structure or a bent plate with two bending structures.

[0047] In the embodiment, the corner flange 215 is a steel plate bending piece arranged at two ends of the side wall 20, has a corner section, one surface of which is overlapped with the side plate body 211 and welded, and the other surface of which is connected to the end wall 30 and provided with a rivet hole.

[0048] As shown in Fig. 3, the vehicle body further comprises a corner connecting plate 40 connected to the side wall 20 and the end wall 30 respectively. The corner connecting plate 40 can be used to pre-connect the side wall 20 and the end wall 30 to fix them.

[0049] The corner connecting plate 40 is connected to the side wall 20 and the end wall 30 by bolts.

[0050] As shown in Fig. 3, the side wall 20 further comprises a side beam arranged at an upper end of the side plate 21, the end wall 30 further comprises an end beam arranged at an upper end of the end plate 31, and the corner connecting plate 40 comprises a first L-shaped plate 41 and a second L-shaped plate 42 connected to each other, the first L-shaped plate 41 is connected to the side plate 21 and the end plate 31 respectively, and the second L-shaped plate 42 is connected to the side beam and the end beam respectively. With the corner connecting plate 40 having the above structure, the side wall 20 and the end wall 30 can be connected at their sides and tops respectively, so that the pre-connection effect is more stable.

[0051] In the embodiment, the end beam is a steel plate bending square tube or a groove structure, and a connecting plate and a rib plate are welded at two ends of the end beam.

[0052] As shown in Fig. 5, the bottom plate 13 comprises a bottom plate body 131 and an end flange 135 arranged at an end of the bottom plate body 131, and an upper end of the end flange 135 is riveted to a lower end of the end plate 31. With the connecting structure having the above structure, the bottom plate 13 and the end plate 31 can be riveted, and the structure is simple and easy to operate.

[0053] As shown in Fig. 1 and Fig. 5, the upright column 32 is arranged outside the end flange 135, a lower end of the upright column 32 protrudes from a lower surface of the bottom plate 13, an end of the longitudinal beam 12 protrudes from the bottom plate 13, and the lower end of the upright column 32 is connected to the part of the longitudinal beam 12 protruding from the bottom plate 13. With the structure having the above structure, the upright column 32 and the longitudinal beam 12 can be welded, and the operation is facilitated.

[0054] The outer side of the end wall 30 is provided with a transverse band extending in the transverse direction, and the upper end of the stand column 32 is welded to the transverse band.

[0055] The bottom plate 13 further comprises an end reinforcing plate 136 arranged obliquely, the upper end of the end reinforcing plate 136 is connected with the end fold plate 135, and the lower end of the end reinforcing plate 136 is connected with the bottom plate 13. The end reinforcing plate 136 can eliminate the right-angle connection, thereby avoiding the accumulation of materials at the right-angle position and facilitating cleaning.

[0056] The vehicle body provided by the embodiment has the following beneficial effects:

[0057] (1) The riveting and welding combination connection mode is adopted between the main parts of the vehicle body, the main beams and columns between the side walls, the end walls and the chassis are welded, the connection strength between the main parts and the rigidity of the vehicle body are ensured, the riveting connection is adopted between the plate materials of the main parts, the long weld seams between the main parts are avoided, the welding workload is small and the welding is easy, large tooling equipment such as a turnover machine is not needed, the assembly difficulty is reduced, the assembly efficiency is improved, the emission of welding fume is also reduced.

[0058] (2) The main structural features of the vehicle body such as the built-in side column and the absence of the lower side beam are maintained, and the parameters such as the volume and the self-weight of the vehicle change little.

[0059] (3) The manufacturing process is fully considered, the pull rivet is horizontally penetrated from the inner side of the vehicle body to the outer side of the vehicle body, the riveting process is good and easy to operate.

[0060] The car body processing method is used for the car body provided above, and comprises the following steps: S1, obtaining a chassis 10, side walls 20, end walls 30 and corner connecting plates 40; S2, fixing the chassis 10 on an assembly table; S3, fixing two side walls 20 on the chassis 10 by using a first set of tools, and pre-connecting the side walls 20 and the chassis 10; S4, fixing two end walls 30 on the chassis 10 by using a second set of tools, and adjusting the end walls 30 so that the height of the end walls 30 is the same as the height of the side walls 20; S5, checking the size of the car body, and adjusting the positions of the end walls 30 and the side walls 20 according to the checking result; S6, pre-connecting the end walls 30 and the side walls 20 by using the corner connecting plates 40 according to the positions of the end walls 30 and the side walls 20, and pre-connecting corner folding plates 215 to the side walls 20; S7, marking the positions of rivet holes of side plates 21 of the side walls 20 and end plates 31 of the end walls 30 according to the positions of the rivet holes of a bottom plate 13 of the chassis 10; S8, disassembling the end walls 30 and the side walls 20 from the chassis 10; S9, welding the corner folding plates 215 to the side walls 20, and processing the rivet holes on the side plates 21 and the end plates 31; S10, fixing two side walls 20 on the chassis 10 by using the first set of tools, and fixing two end walls 30 on the chassis 10 by using the second set of tools; S11, riveting the bottom plate 13 of the chassis 10 and the side plates 21 of the side walls 20, the bottom plate 13 and the end plates 31 of the end walls 30, and the end plates 31 and the side plates 21; and S12, welding side columns 22 of the side walls 20 and the cross beams 11, and upright columns 32 of the end walls 30 and the longitudinal beams 12 of the chassis 10. By fixing the chassis 10, the assembling process is more stable. By fixing the two side walls 20 and the two end walls 30 on the chassis 10, and adjusting the relative height of the side walls 20 and the end walls 30, the car body meeting the size requirement is obtained. By pre-connecting the end walls 30 and the side walls 20 by using the corner connecting plates 40, the rivet holes of the side plates 21 and the end plates 31 can be marked. By disassembling the chassis 10, the side walls 20 and the end walls 30, and then processing the rivet holes by using the marking, and welding the corner folding plates 215, the side plates and the bottom plate, the bottom plate and the end plate, the end plate and the side plate are riveted, and the corner folding plates 215 and the end plates 31 are riveted, and the side columns and the cross beams are welded, and the upright columns and the longitudinal beams are welded, and then the assembling of the car body is completed. Compared with the mode that the chassis 10, the side walls 20 and the end walls 30 are all welded, a large-scale overturning device is not needed, the welding workload is greatly reduced, the long weld joint between the bottom plate 13 and the side plates 21 is omitted, a large number of welders are not needed, environmental pollution is reduced, and the manufacturing cost is reduced.

[0061] It is to be understood that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components and / or combinations thereof, but do not preclude the presence or addition of one or more other features, steps, operations, devices, components and / or combinations thereof.

[0062] The preferred embodiments of the present application have been described above with the intent to enable those skilled in the art to make and use it. Various modifications to the embodiments described in this disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, to the extent that any modifications to the embodiments described in this disclosure are required, they can be undertaken without departing from the spirit or scope of the present application.

Claims

1. A vehicle body, comprising:an underframe (10), comprising cross beams (11), a longitudinal beam (12), and a floor plate (13), wherein the cross beams (11) and the longitudinal beam (12) are arranged to intersect each other on the floor plate (13);side walls (20) located at side portions of the underframe (10), each of the side walls (20) comprising a side plate (21) and side posts (22) arranged on the side plate (21), the side posts (22) extending along a vertical direction, a lower end of the side plate (21) being riveted to a side portion of the floor plate (13), and lower ends of the side posts (22) being welded to the cross beams (11); andend walls (30) located at end portions of the underframe (10), each of the end walls (30) comprising an end plate (31) and a vertical post (32) arranged on the end plate (31), the vertical post (32) extending along the vertical direction, a lower end of the end plate (31) being riveted to an end portion of the floor plate (13), side portions of the end plate (31) being riveted to the side plates (21), and the vertical post (32) being welded to the longitudinal beam (12).

2. The vehicle body according to claim 1, wherein the floor plate (13) comprises a floor plate body (131) and a bottom folded plate (132) connected with side portions of the floor plate body (131), the side plate (21) comprises a side plate body (211) and a side folded plate (212) connected with a lower end of the side plate body (211), the side folded plate (212) and the bottom folded plate (132) are both located on an inner side of the side plate body (211), and the bottom folded plate (132) is riveted to the side folded plate (212).

3. The vehicle body according to claim 2, wherein the bottom folded plate (132) comprises a first vertical plate (133) and a first connecting plate (134), the side folded plate (212) comprises a second vertical plate (213) and a second connecting plate (214), a lower end of the first connecting plate (134) is connected with the floor plate body (131), the first vertical plate (133) is connected with an upper end of the first connecting plate (134), an upper end of the second connecting plate (214) is connected with the side plate body (211), the second vertical plate (213) is connected with a lower end of the second connecting plate (214), and the first vertical plate (133) and the second vertical plate (213) are stacked along the vertical direction and are riveted.connecting plate (214) are arranged obliquely, or the first connecting plate (134) and the second connecting plate (214) are arc-shaped plates.

5. The vehicle body according to claim 1, wherein the side post (22) is located on an inner side of the side plate (21), the floor plate (13) is provided with a through clearance hole, and the side post (22) passes through the clearance hole and is welded to the cross beam (11).

6. The vehicle body according to claim 5, wherein an outer wall of the side post (22) is provided with a post reinforcing plate (221), the post reinforcing plate (221) is located above the floor plate (13) and covers the clearance hole, and a lower surface of the post reinforcing plate (221) is connected with an upper surface of the floor plate (13).

7. The vehicle body according to claim 6, wherein the post reinforcing plate (221) comprises a first reinforcing plate (222), a cover plate (223) and a second reinforcing plate (224) which are connected sequentially from top to bottom and have included angles, an inner wall of the first reinforcing plate (222) is connected with the outer wall of the side post (22), the cover plate (223) covers the clearance hole, and the second reinforcing plate (224) is connected with the floor plate (13).

8. The vehicle body according to claim 1, wherein the side plate (21) comprises a side plate body (211) and a corner folded plate (215) arranged at a side portion of the side plate body (211), the corner folded plate (215) extends along the vertical direction, and the side portion of the end plate (31) is riveted to the corner folded plate (215).

9. The vehicle body according to claim 8, wherein the vehicle body further comprises corner connecting plates (40), and the corner connecting plates (40) are respectively connected with the side walls (20) and the end walls (30).

10. The vehicle body according to claim 9, wherein the side wall (20) further comprises a side beam arranged at an upper end of the side plate (21), the end wall (30) further comprises an end beam arranged at an upper end of the end plate (31), each of the corner connecting plates (40) comprises a first L-shaped plate (41) and a second L-shaped plate (42) which are connected, the first L-shaped plate (41) is respectively connected with the side plate (21) and the end plate (31), and the second L-shaped plate (42) is respectively connected with the side beam and the end beam.body (131) and an end folded plate (135) connected with an end portion of the floor plate body (131), and an upper end of the end folded plate (135) is riveted to the lower end of the end plate (31).

12. The vehicle body according to claim 11, whereinthe vertical post (32) is located on an outer side of the end folded plate (135), a lower end of the vertical post (32) protrudes from a lower surface of the floor plate (13), an end portion of the longitudinal beam (12) protrudes from the floor plate (13), and the lower end of the vertical post (32) is connected with a part of the longitudinal beam (12) protruding from the floor plate (13); and / orthe floor plate (13) further comprises an end reinforcing plate (136) arranged obliquely, an upper end of the end reinforcing plate (136) is connected with the end folded plate (135), and a lower end of the end reinforcing plate (136) is connected with the floor plate (13).

13. A vehicle body machining method, used for machining the vehicle body according to any one of claims 9 to 12, wherein the vehicle body machining method comprises:obtaining an underframe (10), side walls (20), end walls (30) and corner connecting plates (40);fixing the underframe (10) on an assembly table;fixing two side walls (20) on the underframe (10) by using a first assembling jig, and pre-connecting the side walls (20) and the underframe (10);fixing two end walls (30) on the underframe (10) by using a second assembling jig, and adjusting the end walls (30) to ensure that heights of the end walls (30) are a same as heights of the side walls (20);checking sizes of the vehicle body, and adjusting the positions of the end walls (30) and the side walls (20) according to check results;according to the positions of the end walls (30) and the side walls (20), pre-connecting the end walls (30) and the side walls (20) by using the corner connecting plates (40), and pre-connecting corner folded plates (215) to the side walls (20);positions of rivet holes of the side plates (21) of the side walls (20) and the end plates (31) of the end walls (30);disassembling the end walls (30) and the side walls (20) from the underframe (10);welding the corner folded plates (215) to the side walls (20), and machining the rivet holes on the side plates (21) and the end plates (31);fixing the two side walls (20) on the underframe (10) by using the first assembling jig, and fixing the two end walls (30) on the underframe (10) by using the second assembling jig;riveting the floor plate (13) of the underframe (10) and the side plates (21) of the side walls (20), the floor plate (13) and the end plates (31) of the end walls (30), as well as the end plates (31) and the side plates (21); andwelding the side posts (22) of the side walls (20) and the cross beams (11) as well as the vertical posts (32) of the end walls (30) and the longitudinal beam (12) of the underframe (10).

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