CN209833799U - Boxcar - Google Patents

Abstract

The utility model provides a boxcar belongs to motor-driven carriage technical field. It has solved the problem of easy deformation when current boxcar collides. This boxcar includes the bottom plate unit, the roof unit, the front bezel unit, the back door unit, frame and two curb plate units, the bottom plate unit, the roof unit, the front bezel unit, back door unit and two curb plate units are linked into an entirety through the frame, the curb plate unit is including being flat-plate first interior plate, be flat-plate first outer panel and be the first buffer board of flute form, first buffer board is located between first interior plate and the first outer panel, the inboard and the first interior plate of first buffer board offset and lean on, the outside and the first outer panel of first buffer board offset and lean on. This boxcar has the advantage that non-deformable when bumping.

Description

Boxcar

Technical Field

The utility model belongs to the technical field of the motor coach, a boxcar is related to.

Background

The traditional commercial truck carriage is made of steel, the total mass of a carriage body is large, so that the oil consumption of the truck during running is large, at present, the light weight of the automobile becomes the trend of the times, the carriage is lightened, and the requirement for reducing the energy consumption is very strong.

Various improvements have been made to reduce the weight of a truck bed, such as a lightweight all-aluminum light truck bed disclosed in chinese patent literature [ application No.: 201810159486.1, respectively; application publication No.: CN108357570A ], the carriage comprises a bottom plate unit, a top plate unit, a column keel unit, a side plate unit and a rear door unit; assembling after each unit is independently manufactured; the 4 groups of upright column keel units are respectively and vertically arranged at four corners of the aluminum alloy bottom plate unit; in the length direction of the aluminum alloy bottom plate unit, two long side plate units are perpendicular to the aluminum alloy bottom plate unit and are respectively and oppositely arranged among the 2 upright post keel units; one end of the aluminum alloy bottom plate unit is provided with a rear door unit which is arranged between the two upright post keel units in the width direction of the aluminum alloy bottom plate unit in the length direction; the other end is provided with a short side plate unit which is arranged between the two upright post keel units; and the top plate unit is arranged at the corner of the top plate unit 4, and each edge of the top plate unit is respectively connected with the side plate unit and the rear door unit.

The boxcar of this kind of structure includes bottom plate unit, roof unit, stand fossil fragments unit, curb plate unit and back door unit, and the back is independently makeed to each unit, assembles, and this carriage reduces more than 40% to the standard specification steel carriage, box total weight. However, in the boxcar with the structure, the side plates are of an integral corrugated plate profiling structure, namely, the whole side plates are corrugated, concave and convex and solid, and the solid side plates enable the overall weight of the boxcar to be still heavier.

Disclosure of Invention

The utility model aims at the above-mentioned problem that exists among the prior art, provide a boxcar, the technical problem of solution makes boxcar's weight lighter. The purpose of the utility model can be realized by the following technical proposal: the utility model provides a boxcar, includes bottom plate unit, roof unit, front bezel unit, back door unit, frame and two curb plate units, bottom plate unit, roof unit, front bezel unit, back door unit and two curb plate units are linked into a whole through the frame, its characterized in that, curb plate unit is including being the first inner panel of flat-plate form, being the first outer panel of flat-plate form and being the first buffer board of flute form, first buffer board is located between first inner panel and the first outer panel, the inboard and the first inner panel counterbalance of first buffer board lean on, the outside and the first outer panel counterbalance of first buffer board lean on.

The boxcar is characterized in that the two sides of the boxcar are side plate units which are of a three-layer hollow composite structure, a first buffer plate in each side plate unit is corrugated, the first buffer plate is located between a first inner side plate and a first outer side plate, the inner side of the first buffer plate abuts against the first inner side plate, the outer side of the first buffer plate abuts against the first outer side plate, namely, a buffer energy absorption space is arranged in each side plate unit, and the side plate units are hollow due to the existence of the space, so that the weight of each side plate unit can be reduced, the overall weight of the boxcar is reduced, and the weight of the boxcar is lighter; and the existence of the buffering energy-absorbing space can absorb impact energy when the boxcar is collided at the side surface, so that the boxcar is not easy to deform after the collision.

In the truck carriage, the bottom plate unit, the top plate unit, the front plate unit, the rear door unit, the frame and the two side plate units are all made of aluminum materials, and the bottom plate unit, the top plate unit, the front plate unit, the rear door unit, the frame and the two side plate units are fixedly connected in a screwing or riveting mode when being connected. The boxcar is of an all-aluminum structure, has light weight and high strength, and can reduce oil consumption; and the materials on the carriage of the truck can be recovered by more than 99 percent without welding, so that the truck is energy-saving and environment-friendly. In foretell boxcar, the frame includes top frame, underframe and a plurality of connecting rod, top frame and underframe all are the cuboid form, the connecting rod is located the corner of top frame and underframe, the one end and the top frame of connecting rod link firmly mutually, the other end and the underframe of connecting rod link firmly mutually. The frame has the functions of connection and support, so that all the parts can be combined into a rectangular boxcar.

In the truck carriage, the side plate unit further comprises a partition bar, the top of the partition bar is fixedly connected with the top frame, the bottom of the partition bar is fixedly connected with the bottom frame, the space enclosed by the top frame, the bottom frame and the two connecting rods is divided into two areas by the partition bar, and the first inner side plate, the first outer side plate and the first buffer plate are arranged in each area. The parting bead itself can improve the intensity of curb plate unit, and the setting up of parting bead can make the area of first interior plate, first outer panel and first buffer board can be corresponding little simultaneously, improves the intensity of first interior plate, first outer panel and first buffer board self to improve the bulk strength of this curb plate unit, make boxcar collision back non-deformable.

In the boxcar, one of the side plate units further comprises a side door frame, the top of the side door frame is fixedly connected with the top frame, the bottom of the side door frame is fixedly connected with the bottom frame, one side of the side door frame is provided with the division bar, and a rotatable side door is arranged in the side door frame. The structure enables the boxcar to be opened from the rear part and also from the side part, so that goods in the boxcar can be loaded and unloaded conveniently, and the parting strip is arranged on one side of the side door frame, so that the area occupied by the side door frame can be reduced.

As another situation, in the above wagon box, one of the side panel units further includes a side door frame, the top of the side door frame is fixedly connected to the top frame, the bottom of the side door frame is fixedly connected to the bottom frame, one side of the side door frame is fixedly connected to the division bar, and a rotatable side door is disposed in the side door frame. This kind of structure makes boxcar can follow the rear portion and open outward, can also open from the lateral part, makes the goods loading and unloading in the boxcar convenient, and one side of side door frame links firmly mutually with the parting bead, improvement curb plate unit's that can be corresponding intensity.

In foretell boxcar, the side door includes the side frame, is flat second inside plate, is flat second curb plate and is the second buffer board of flute form, one side and the side door frame of side frame are articulated mutually, just the side frame can be located the side door frame, second inside plate, second curb plate and second buffer board all set up in the side frame, the second buffer board is located between second inside plate and the second curb plate, the inboard and the second inside plate of second buffer board offset and lean on, the outside and the second curb plate of second buffer board offset and lean on. This kind of structure makes the side door be three-layer cavity composite construction, has the space of buffering energy-absorbing in the side door, makes the side door non-deformable after bumping, and the existence in this space makes the side door be hollow form moreover, can reduce the weight of side door to reduce this boxcar's whole weight. In the above freight car, the rear door unit includes a rear door frame, a left rear door and a right rear door, the top of the rear door frame is fixedly connected to the top frame, the bottom of the rear door frame is fixedly connected to the bottom frame, two sides of the rear door frame are fixedly connected to corresponding connecting rods, the left rear door and the right rear door are disposed in the rear door frame, and the left rear door and the right rear door can rotate around the rear door frame. The goods loaded and unloaded in the boxcar are mainly at the rear part, and the structure is double-door and convenient to open and close.

In foretell boxcar, left side back door and right back door all include the back frame, are flat third inside plate, are flat third outside plate and are the third buffer board of flute form, one side of back frame is articulated mutually with the back door frame, just back frame can be arranged in the back door frame, third inside plate, third outside plate and third buffer board all set up in the back frame, the third buffer board is located between third inside plate and the third outside plate, the inboard and the third inside plate of third buffer board offset and lean on, the outside and the third outside plate of third buffer board offset and lean on. By adopting the structure, the left rear door and the right rear door are both of a three-layer hollow composite structure, and the strength is high; the left rear door and the right rear door are provided with spaces for buffering and absorbing energy, and the left rear door and the right rear door are not easy to deform, so that the boxcar is not easy to deform; and the existence in this space makes left back door and right back door all be hollow form, can reduce the weight of left back door and right back door to reduce this boxcar's whole weight.

In the truck carriage, the front plate unit comprises a front plate, the top of the front plate is fixedly connected with the top frame, the bottom of the front plate is fixedly connected with the bottom frame, and two sides of the front plate are fixedly connected with corresponding connecting rods respectively.

In the above freight car, the front panel includes a flat fourth inner side panel, a flat fourth outer side panel, and a corrugated fourth buffer plate, the fourth buffer plate is located between the fourth inner side panel and the fourth outer side panel, an inner side of the fourth buffer plate abuts against the fourth inner side panel, and an outer side of the fourth buffer plate abuts against the fourth outer side panel. According to the structure, the front plate is of a three-layer hollow composite structure, the front plate is provided with a space for buffering and absorbing energy, and the front plate is not easy to deform, so that a boxcar is not easy to deform; and the existence of the space makes the front plate be hollow, so that the weight of the front plate can be reduced, and the whole weight of the boxcar can be reduced.

In the above-mentioned truck carriage, the bottom plate unit includes bottom plate, a plurality of bottom crossbeams and a plurality of bottom longerons, the bottom crossbeam sets up along the width direction of underframe, just the both ends of bottom crossbeam all link firmly mutually with the underframe, the bottom longeron sets up along the length direction of underframe, just the both ends of bottom longeron all link firmly mutually with the underframe, along vertical direction, the bottom plate is located the top of bottom crossbeam, the bottom crossbeam is located the top of bottom longeron, the bottom crossbeam links firmly mutually with the bottom longeron, the bottom plate links firmly mutually with the bottom crossbeam. The structure ensures that the strength of the bottom of the boxcar is high, and the bottom of the boxcar is not easy to deform when a heavy object is loaded, so that the boxcar is not easy to deform.

In the above boxcar, the bottom plate is a flat plate or a corrugated plate.

In the truck carriage, the top plate unit comprises a top plate and a plurality of top cross beams, the top cross beams are located in the top frame, two ends of each top cross beam are fixedly connected with the top frame, and the top plate is fixedly connected to the top cross beams.

In the above boxcar, the top plate is a flat plate or a corrugated plate.

Compared with the prior art, the utility model provides a boxcar has following advantage:

1. this boxcar is receiving the lateral part, front portion and the rear portion that the collision influences easily and setting up three-layer cavity composite construction panel, and this panel has the space of buffering energy-absorbing, when boxcar takes place the side door collision, can absorb impact energy, makes boxcar non-deformable, and the existence in this space makes boxcar's lateral part, front portion and rear portion all be hollow form moreover, can reduce this boxcar's whole weight, and this boxcar is full aluminium structure simultaneously, makes this boxcar's weight lighter.

2. The boxcar is an all-aluminum boxcar, and has light weight and high strength; and all the materials are fixedly connected in a screwing and riveting mode without a welding process, so that more than 99% of the materials of the boxcar can be recycled, and the boxcar is energy-saving and environment-friendly.

Drawings

Fig. 1 is a schematic overall structure diagram of the truck compartment.

Fig. 2 is a schematic view of the overall structure of the truck bed.

Fig. 3 is a partial structural schematic view of a side panel unit of the present freight car body.

Fig. 4 is a partial structural schematic view of a side door of the present truck bed.

Fig. 5 is a partial structural schematic view of the left and right rear doors of the truck bed.

Fig. 6 is a partial structural view of the front panel of the truck bed.

Fig. 7 is a schematic structural view of the present truck bed unit.

Fig. 8 is a schematic structural view of the present boxcar roof unit.

In the figure, 1, a bottom plate unit; 11. a base plate; 12. a bottom cross member; 13. a bottom stringer; 2. a top plate unit; 21. a top plate; 22. a top cross beam; 3. a front plate unit; 31. a front plate; 32. a fourth inner side plate; 33. a fourth exterior side panel; 34. a fourth buffer plate; 4. a rear door unit; 41. a rear door frame; 42. a left rear door; 43. a right rear door; 44. a rear frame; 45. a third inner side plate; 46. a third outer panel; 47. a third buffer plate; 5. a frame; 51. a top frame; 52. a bottom frame; 53. a connecting rod; 6. a side plate unit; 61. a first inner side panel; 62. a first outer panel; 63. a first buffer plate; 64. a parting strip; 65. a side door frame; 66. a side door; 67. a side frame; 68. a second inner side panel; 69. a second exterior plate; 610. a second buffer plate.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

Example one

As shown in fig. 1 and 2, the boxcar comprises a bottom plate unit 1, a top plate unit 2, a front plate unit 3, a rear door unit 4, a frame 5 and two side plate units 6, the bottom plate unit 1, the top plate unit 2, the front plate unit 3, the rear door unit 4, the frame 5 and the two side plate units 6 are made of aluminum materials, the bottom plate unit 1, the top plate unit 2, the front plate unit 3, the rear door unit 4 and the two side plate units 6 are connected into a whole through the frame 5, and during connection, the boxcar is fixedly connected through a rivet riveting mode, and a fastener is fixedly connected through a bolt and nut bolt connection mode and an angle iron matching and fixedly connecting mode.

Frame 5 includes top frame 51, underframe 52 and connecting rod 53, and in this embodiment, top frame 51 and underframe 52 all are the cuboid form, and the quantity of connecting rod 53 is four, and connecting rod 53 is located the corner of top frame 51 and underframe 52, and the one end and the top frame 51 of connecting rod 53 link firmly mutually, and the other end and the underframe 52 of connecting rod 53 link firmly mutually, and in actual production, the quantity of connecting rod 53 can be six or eight.

As shown in fig. 3, the side plate unit 6 includes a spacer 64, a first inner plate 61 in a flat plate shape, a first outer plate 62 in a flat plate shape, and a first corrugated buffer plate 63, wherein a top of the spacer 64 is fixedly connected to the top frame 51, a bottom of the spacer 64 is fixedly connected to the bottom frame 52, the spacer 64 divides a space enclosed by the top frame 51, the bottom frame 52, and the two connecting rods 53 into two regions, each of the regions is provided with the first inner plate 61, the first outer plate 62, and the first buffer plate 63, the first buffer plate 63 is located between the first inner plate 61 and the first outer plate 62, an inner side of the first buffer plate 63 abuts against the first inner plate 61, and an outer side of the first buffer plate 63 abuts against the first outer plate 62. One side plate unit 6 of the two side plate units 6 further comprises a side door frame 65, the top of the side door frame 65 is fixedly connected with the top frame 51, the bottom of the side door frame 65 is fixedly connected with the bottom frame 52, a division bar 64 is arranged on one side of the side door frame 65, and a rotatable side door 66 is arranged in the side door frame 65.

As shown in fig. 4, the side door 66 includes a side frame 67, a second inner side plate 68 having a flat plate shape, a second outer side plate 69 having a flat plate shape, and a second buffer plate 610 having a corrugated shape, one side of the side frame 67 is hinged to the side door frame 65, the side frame 67 is capable of being positioned in the side door frame 65, the second inner side plate 68, the second outer side plate 69, and the second buffer plate 610 are all disposed in the side frame 67, the second buffer plate 610 is positioned between the second inner side plate 68 and the second outer side plate 69, the inner side of the second buffer plate 610 abuts against the second inner side plate 68, and the outer side of the second buffer plate 610 abuts against the second outer side plate 69.

The rear door unit 4 includes a rear door frame 41, a left rear door 42, and a right rear door 43, the top of the rear door frame 41 is fixedly connected to the top frame 51, the bottom of the rear door frame 41 is fixedly connected to the bottom frame 52, both sides of the rear door frame 41 are respectively fixedly connected to the corresponding connecting rods 53, the left rear door 42 and the right rear door 43 are disposed in the rear door frame 41, and the left rear door 42 and the right rear door 43 can rotate around the rear door frame 41. As shown in fig. 5, each of the left and right rear doors 42 and 43 includes a rear frame 44, a flat third inner side plate 45, a flat third outer side plate 46, and a corrugated third cushion plate 47, one side of the rear frame 44 is hinged to the rear door frame 41, the rear frame 44 can be positioned in the rear door frame 41, the third inner side plate 45, the third outer side plate 46, and the third cushion plate 47 are all provided in the rear frame 44, the third cushion plate 47 is positioned between the third inner side plate 45 and the third outer side plate 46, an inner side of the third cushion plate 47 abuts against the third inner side plate 45, and an outer side of the third cushion plate 47 abuts against the third outer side plate 46.

The front plate unit 3 includes a front plate 31, the top of the front plate 31 is fixedly connected with a top frame 51, the bottom of the front plate 31 is fixedly connected with a bottom frame 52, and two sides of the front plate 31 are fixedly connected with corresponding connecting rods 53 respectively. As shown in fig. 6, the front plate 31 includes a flat-plate-shaped fourth inner side plate 32, a flat-plate-shaped fourth outer side plate 33, and a corrugated fourth cushion plate 34, the fourth cushion plate 34 is positioned between the fourth inner side plate 32 and the fourth outer side plate 33, an inner side of the fourth cushion plate 34 abuts against the fourth inner side plate 32, and an outer side of the fourth cushion plate 34 abuts against the fourth outer side plate 33.

As shown in fig. 7, the floor unit 1 includes a floor 11, bottom cross beams 12 and bottom longitudinal beams 13, in this embodiment, the number of the bottom cross beams 12 is seven, the number of the bottom longitudinal beams 13 is two, and in actual production, the number of the bottom cross beams 12 may be five or ten, and the number of the bottom longitudinal beams 13 is one or three. The bottom cross beam 12 is arranged along the width direction of the bottom frame 52, both ends of the bottom cross beam 12 are fixedly connected with the bottom frame 52, the bottom longitudinal beam 13 is arranged along the length direction of the bottom frame 52, both ends of the bottom longitudinal beam 13 are fixedly connected with the bottom frame 52, the bottom plate 11 is positioned above the bottom cross beam 12 along the vertical direction, the bottom cross beam 12 is positioned above the bottom longitudinal beam 13, the bottom cross beam 12 is fixedly connected with the bottom longitudinal beam 13, and the bottom plate 11 is fixedly connected with the bottom cross beam 12. In this embodiment, the bottom plate 11 is a corrugated plate, and in actual production, the bottom plate 11 may be a flat plate.

As shown in fig. 8, the ceiling unit 2 includes a ceiling 21 and top cross beams 22, in the present embodiment, the number of the top cross beams 22 is six, and in actual production, the number of the top cross beams 22 may be four or eight. The top beam 22 is located in the top frame 51, and both ends of the top beam 22 are fixedly connected with the top frame 51, and the top plate 21 is fixedly connected on the top beam 22. In this embodiment, the top plate 21 is a corrugated plate, and in actual production, the top plate 21 may be a flat plate.

When the boxcar is assembled, the bottom plate unit 1 is hoisted to the assembly platform, the front plate unit 3 is fixedly installed on the bottom plate unit 1 through bolts and angle irons, the left side plate unit 6 is fixedly connected with the bottom frame 52 and the corresponding connecting rod 53 through rivets, the right side plate unit 6 is fixedly connected with the bottom frame 52 and the corresponding connecting rod 53 through rivets, the side door frame 65 is hoisted in place, the side door frame 65 is fixedly installed with the top frame 51 and the bottom frame 52 through bolts, the side door frame 65 is fixedly connected with the partition strip 64 through rivets, the rear door unit 4 is hoisted and fixed, the top plate unit 2 is hoisted and fixed, the side door 66, the left rear door 42 and the right rear door 43 are installed, and finally, angle protectors and the like are installed.

Example two

The structure and principle of this embodiment are the same as those of embodiment one, and the difference lies in that, in this embodiment, one of them curb plate unit 6 in two curb plate unit 6 still includes side door frame 65, and the top of side door frame 65 links firmly with top frame 51 mutually, and the bottom of side door frame 65 links firmly with underframe 52 mutually, and one side of side door frame 65 links firmly with parting bead 64 mutually, is equipped with rotatable side door 66 in the side door frame 65.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Although terms such as floor unit 1, floor 11, bottom cross member 12, bottom side member 13, roof unit 2, roof 21, top cross member 22, front panel unit 3, front panel 31, fourth inner side panel 32, fourth outer side panel 33, fourth bumper panel 34, rear door unit 4, rear door frame 41, left rear door 42, right rear door 43, rear frame 44, third inner side panel 45, third outer side panel 46, third bumper panel 47, frame 5, top frame 51, bottom frame 52, connecting rod 53, side panel unit 6, first inner side panel 61, first outer side panel 62, first bumper panel 63, spacer 64, side door frame 65, side door 66, side frame 67, second inner side panel 68, second outer side panel 69, second bumper panel 610, etc., are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.

Claims (10)

1. A boxcar comprises a bottom plate unit (1), a top plate unit (2), a front plate unit (3), a rear door unit (4), a frame (5) and two side plate units (6), the bottom plate unit (1), the top plate unit (2), the front plate unit (3), the rear door unit (4) and the two side plate units (6) are connected into a whole through a frame (5), characterized in that the side plate unit (6) comprises a first inner side plate (61) in a flat plate shape, a first outer side plate (62) in a flat plate shape and a first buffer plate (63) in a corrugated shape, the first baffle plate (63) is located between the first inner side plate (61) and the first outer side plate (62), the inner side of the first buffer plate (63) is abutted against the first inner side plate (61), the outer side of the first buffer plate (63) is abutted against the first outer side plate (62).

2. A boxcar according to claim 1, characterized in that the floor unit (1), the roof unit (2), the front panel unit (3), the rear door unit (4), the frame (5) and the two side panel units (6) are all made of aluminium material, and the floor unit (1), the roof unit (2), the front panel unit (3), the rear door unit (4), the frame (5) and the two side panel units (6) are all fixedly connected by screwing or riveting when connected.

3. A boxcar according to claim 1 or 2, characterized in that the frame (5) comprises a top frame (51), a bottom frame (52) and a plurality of connecting rods (53), the top frame (51) and the bottom frame (52) each having a rectangular parallelepiped shape, the connecting rods (53) being located at the corners of the top frame (51) and the bottom frame (52), one end of the connecting rod (53) being fixedly connected to the top frame (51) and the other end of the connecting rod (53) being fixedly connected to the bottom frame (52).

4. A boxcar according to claim 3, characterized in that the lateral panel unit (6) further comprises a division bar (64), the top of the division bar (64) is fixedly connected with the top frame (51), the bottom of the division bar (64) is fixedly connected with the bottom frame (52), the division bar (64) divides the space enclosed by the top frame (51), the bottom frame (52) and the two connecting rods (53) into two areas, and the first inner panel (61), the first outer panel (62) and the first buffer panel (63) are arranged in each area.

5. A boxcar according to claim 4, characterized in that one of the side panel units (6) further comprises a side door frame (65), the top of the side door frame (65) is fixedly connected with the top frame (51), the bottom of the side door frame (65) is fixedly connected with the bottom frame (52), one side of the side door frame (65) is the division bar (64) or one side of the side door frame (65) is fixedly connected with the division bar (64), and a rotatable side door (66) is arranged in the side door frame (65).

6. A boxcar according to claim 5, characterised in that the side door (66) comprises a side frame (67), a second inner side plate (68) in the form of a flat plate, a second outer side plate (69) in the form of a flat plate and a second cushioning plate (610) in the form of corrugations, one side of the side frame (67) being hinged to the side frame (65) and the side frame (67) being locatable in the side frame (65), the second inner side plate (68), the second outer side plate (69) and the second cushioning plate (610) being arranged in the side frame (67), the second cushioning plate (610) being located between the second inner side plate (68) and the second outer side plate (69), the inner side of the second cushioning plate (610) abutting against the second inner side plate (68), and the outer side of the second cushioning plate (610) abutting against the second outer side plate (69).

7. A boxcar according to claim 3, characterized in that the rear door unit (4) comprises a rear door frame (41), a left rear door (42) and a right rear door (43), the top of the rear door frame (41) is fixedly connected with a top frame (51), the bottom of the rear door frame (41) is fixedly connected with a bottom frame (52), two sides of the rear door frame (41) are fixedly connected with corresponding connecting rods (53), respectively, the left rear door (42) and the right rear door (43) are arranged in the rear door frame (41), and the left rear door (42) and the right rear door (43) can rotate around the rear door frame (41).

8. A boxcar according to claim 7, characterized in that the left rear door (42) and the right rear door (43) each comprise a rear frame (44), a third inner side plate (45) in the form of a flat plate, a third outer side plate (46) in the form of a flat plate and a third baffle plate (47) in the form of a corrugation, one side of the rear frame (44) being hinged to the rear door frame (41), and the rear frame (44) can be positioned in the rear door frame (41), the third inner side plate (45), the third outer side plate (46) and the third buffer plate (47) are all arranged in the rear frame (44), the third baffle plate (47) is located between the third inner side plate (45) and the third outer side plate (46), the inner side of the third buffer plate (47) is abutted against the third inner side plate (45), the outer side of the third buffer plate (47) is abutted against the third outer side plate (46).

9. A freight car according to claim 3, wherein the front panel unit (3) comprises a front panel (31), the top of the front panel (31) is fixedly connected with a top frame (51), the bottom of the front panel (31) is fixedly connected with a bottom frame (52), two sides of the front panel (31) are fixedly connected with corresponding connecting rods (53), the front panel (31) comprises a fourth inner side plate (32) in a flat plate shape, a fourth outer side plate (33) in a flat plate shape and a fourth buffer plate (34) in a corrugated shape, the fourth buffer plate (34) is located between the fourth inner side plate (32) and the fourth outer side plate (33), the inner side of the fourth buffer plate (34) abuts against the fourth inner side plate (32), and the outer side of the fourth buffer plate (34) abuts against the fourth outer side plate (33).

10. A boxcar according to claim 3, characterized in that the floor unit (1) comprises a floor (11), a number of bottom cross beams (12) and a number of bottom longitudinal beams (13), the bottom cross beams (12) are arranged along the width direction of the underframe (52), and both ends of the bottom cross beams (12) are fixedly connected with the underframe (52), the bottom longitudinal beams (13) are arranged along the length direction of the underframe (52), and both ends of the bottom longitudinal beams (13) are fixedly connected with the underframe (52), along the vertical direction, the floor (11) is positioned above the bottom cross beams (12), the bottom cross beams (12) are positioned above the bottom longitudinal beams (13), the bottom cross beams (12) are fixedly connected with the bottom longitudinal beams (13), the floor (11) is fixedly connected with the bottom cross beams (12), the roof unit (2) comprises a roof (21) and a number of roof cross beams (22), the top beam (22) is positioned in the top frame (51), the two ends of the top beam (22) are fixedly connected with the top frame (51), and the top plate (21) is fixedly connected to the top beam (22).