Shunting locomotive

Abstract

The invention relates to the technical field of shunting locomotives, and particularly discloses a shunting locomotive which comprises a locomotive body assembly, a top cover structure and a pantograph. The vehicle body assembly comprises a chassis, a cab and a mechanical room, the cab and the mechanical room are fixed to the chassis, an outdoor corridor is formed on the horizontal side of the cab, the mechanical room and the cab are arranged at intervals in the front-back direction, and the outdoor corridor communicates with the chassis and the mechanical room; the top cover structure comprises a top cover body and protective plates, the top cover body is installed on the top of the cab and the top of the mechanical room, the protective plates are installed on the two opposite sides of the top cover body in the left-right direction and extend in the front-back direction, in the left-right direction, the sides, away from the top cover body, of the protective plates incline upwards, and the protective plates cover an outdoor corridor; the pantograph is installed on the top cover body, the minimum distance between the pantograph and the top cover structure is larger than 500 mm, and the top cover structure forms an insulation interlayer between the vehicle body assembly and the pantograph. In this way, the problems that a shunting locomotive and pantograph equipment are difficult to be matched with each other, and potential safety hazards exist for operation safety of operators are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of shunting locomotive, in particular to a shunting locomotive. BACKGROUND

[0002] The shunting locomotive is a railway locomotive specially used for shunting operation. Unlike the main line locomotive responsible for pulling passenger or freight trains for long-distance operation on the main railway line, the shunting locomotive is active in the internal "station" of the marshalling station, section station, port station, large industrial and mining enterprises, etc. with a large number of railway lines, to disassemble, assemble and move the vehicles, and to ensure that the train can be correctly formed and departed.

[0003] The traditional shunting locomotive is mostly diesel engine type, using diesel engine as driving source. However, with the increasing demand for clean energy, diesel engine gradually cannot meet the use standard. When using electric energy as driving source, the installation and use of pantograph and its supporting high-voltage equipment will generate a large current. For the shunting locomotive requiring outdoor operation of the operator, it is difficult to adapt, and the safety of the operator cannot be guaranteed. Moreover, the overall structure of the existing electric drive main line locomotive is fully enclosed, and there is no outdoor operation condition of the operator, so the structure of the electric drive main line locomotive cannot be directly copied to the shunting locomotive.

[0004] Therefore, there is an urgent need for a shunting locomotive to change the above problems. SUMMARY

[0005] The present application aims to provide a shunting locomotive to solve the problem that the shunting locomotive and the pantograph device are difficult to adapt to each other, and there is a hidden danger to the safety of the operator.

[0006] In one aspect, the present application provides a shunting locomotive, which comprises:

[0007] The car body assembly comprises a chassis and a driver's cabin and a mechanical room fixed to the chassis. The horizontal side of the driver's cabin forms an outdoor corridor. The mechanical room is spaced apart from the driver's cabin in the front-rear direction. The outdoor corridor communicates between the chassis and the mechanical room.

[0008] The roof structure comprises a roof main body and a guard plate. The roof main body is installed on the top of the driver's cabin and the mechanical room. The guard plate is installed on the opposite sides of the roof main body in the left-right direction. The guard plate extends in the front-rear direction. In the left-right direction, the side of the guard plate away from the roof main body is inclined upward. The guard plate covers the outdoor corridor.

[0009] The pantograph is installed on the roof main body. The minimum distance between the pantograph and the roof structure is greater than 500 mm. The roof structure forms an insulating layer between the car body assembly and the pantograph.

[0010] As a preferred technical solution of the above shunting locomotive, the above protective plate comprises a first plate, a second plate and a third plate, and the first plate, the second plate and the third plate are connected in sequence along the front-rear direction.

[0011] As a preferred technical solution of the above shunting locomotive, the connection between the first plate and the second plate is in a labyrinth shape and filled with insulating sealant, and / or the connection between the second plate and the third plate is in a labyrinth shape and filled with insulating sealant.

[0012] As a preferred technical solution of the above shunting locomotive, the protective plate is provided with a mounting hole, the mounting hole is located on the side of the protective plate away from the pantograph in the left-right direction, and a connecting piece is inserted into the mounting hole and connected with the top cover body.

[0013] As a preferred technical solution of the above shunting locomotive, the axial end faces of the mounting hole are provided with steel pads.

[0014] As a preferred technical solution of the above shunting locomotive, the top cover structure further comprises a protective sleeve, the protective sleeve is sleeved on the end of the connecting piece, and the bottom of the protective sleeve is adhesively sealed and fixed with the axial end face of the mounting hole.

[0015] As a preferred technical solution of the above shunting locomotive, the area of the top cover body for installing the pantograph is embedded with a heating piece.

[0016] As a preferred technical solution of the above shunting locomotive, the heating piece is in a plate structure, the heating piece comprises a first composite plate layer, a heating layer, a sandwich layer and a second composite plate layer, the first composite plate layer, the heating layer, the sandwich layer and the second composite plate layer are stacked in sequence in the vertical direction, the first composite plate layer and the second composite plate layer are both used for insulation, the heating layer can generate heat, the sandwich layer is in a honeycomb shape, and the sandwich layer is located between the heating layer and the vehicle body assembly and used for inhibiting heat conduction between the heating layer and the vehicle body assembly.

[0017] As a preferred technical solution of the above shunting locomotive, the top cover body is inclined, the left and right sides of the top cover body have a height difference, or the middle part of the top cover body is higher than the left and right sides.

[0018] As a preferred technical solution of the above shunting locomotive, the top cover body comprises an outer skin, a perimeter frame and horizontal-vertical support beams, the horizontal-vertical support beams are installed in the perimeter frame, and the outer skin is installed on the horizontal-vertical support beams and the perimeter frame.

[0019] The shunting locomotive provided by the present application has at least the following beneficial effects:

[0020] The application provides a shunting locomotive, comprising a vehicle body assembly, a roof structure and a pantograph. The vehicle body assembly comprises a chassis, a cab and a mechanical room fixed to the chassis, a horizontal side of the cab forms an outdoor corridor, the mechanical room is arranged in a front-rear direction and spaced apart from the cab, and the outdoor corridor is connected between the chassis and the mechanical room; the roof structure comprises a roof main body and a guard plate, the roof main body is installed on the top of the cab and the mechanical room, the guard plate is installed on the opposite sides of the roof main body in the left-right direction, the guard plate extends in the front-rear direction, and in the left-right direction, the side of the guard plate away from the roof main body is inclined upward, and the guard plate covers the outdoor corridor; the pantograph is installed on the roof main body, the minimum distance between the pantograph and the roof structure is greater than 500 mm, and the roof structure forms an insulating layer between the vehicle body assembly and the pantograph.

[0021] Illustratively, the roof main body is used to install the pantograph and high-voltage equipment, and the roof main body insulates and isolates the pantograph and high-voltage equipment from the vehicle body assembly; the guard plate is installed on the left and right sides of the roof main body, one end of the guard plate is connected with the roof main body, the other end is inclined upward, the guard plate and the roof main body form a groove structure, the pantograph and high-voltage equipment are half-enclosed in the groove structure, and the guard plate shields above the outdoor corridor, so that the user is also insulated from the pantograph and high-voltage equipment when passing through the outdoor corridor, thereby improving the work safety of the user. And the minimum distance between the roof structure and the pantograph is greater than 500 mm, which meets the air insulation requirement. In this way, the shunting locomotive can obtain electric energy as a driving energy source through the pantograph to replace the traditional diesel engine function, realizing energy cleanization, and the roof structure enables the pantograph and high-voltage equipment to safely operate on the vehicle body assembly, adapts to the working environment, does not affect the work of the staff, and ensures the work safety of the staff. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 FIG. 1 is a structural schematic diagram of a shunting locomotive in an embodiment of the application;

[0023] Figure 2 FIG. 2 is a structural schematic diagram of a roof structure in an embodiment of the application;

[0024] Figure 3 FIG. 3 is a structural schematic diagram of a roof main body in an embodiment of the application; Figure 1

[0025] Figure 4 FIG. 4 is a structural schematic diagram of a roof main body in an embodiment of the application; Figure 2

[0026] Figure 5 FIG. 5 is a partial structural schematic diagram of a groove of a roof main body in an embodiment of the application;

[0027] Figure 6 FIG. 6 is a partial structural schematic diagram of a groove of a roof structure in an embodiment of the application;​​

[0028] Figure 7 is a partial view of a suspension seat of the top cover body in the embodiment of the present application;

[0029] Figure 8 is a structural view of the guard plate in the embodiment of the present application;

[0030] Figure 9 is a partial enlarged view of the connection between the first plate and the second plate in the embodiment of the present application;

[0031] Figure 10 is a structural view of the outer profile surface of the guard plate in the embodiment of the present application;

[0032] Figure 11 is a structural view of the inner structure of the heating element in the embodiment of the present application.

[0033] In the drawings:

[0034] X, front-rear direction; Y, left-right direction; Z, vertical direction;

[0035] 1, underframe; 2, cab; 3, machinery room;

[0036] 4, top cover structure; 41, top cover body; 411, outer skin; 412, perimeter frame; 413, transverse and longitudinal support beam; 414, sunroof; 415, groove; 42, guard plate; 42a, outer profile surface; 421, first plate; 422, second plate; 423, third plate; 43, heating element; 431, first composite plate layer; 432, heating layer; 433, sandwich layer; 434, second composite plate layer; 44, suspension seat; 45, reinforcing plate. DETAILED DESCRIPTION

[0037] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0038] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and moreover, the "above", "over" and "on" of the first feature to the second feature include the first feature above and obliquely above the second feature, or only indicate that the first feature is higher than the second feature in horizontal height. The "below", "under" and "under" of the first feature to the second feature include the first feature below and obliquely below the second feature, or only indicate that the first feature is lower than the second feature in horizontal height.

[0039] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation on the present application.

[0041] As Figures 1 to 11As shown, the application provides a shunting locomotive, which comprises a vehicle body assembly, a roof structure 4 and a pantograph. The vehicle body assembly comprises a chassis 1, a cab 2 and a mechanical room 3 fixed to the chassis 1, the horizontal side of the cab 2 forms an outdoor corridor, the mechanical room 3 is arranged along the front-rear direction X and is spaced apart from the cab 2, and the outdoor corridor is connected between the chassis 1 and the mechanical room 3; the roof structure 4 comprises a roof main body 41 and a guard plate 42, the roof main body 41 is installed on the top of the cab 2 and the mechanical room 3, the guard plate 42 is installed on the opposite sides of the roof main body 41 along the left-right direction Y, the guard plate 42 extends along the front-rear direction X, and the side of the guard plate 42 away from the roof main body 41 is inclined upward along the left-right direction Y, and the guard plate 42 covers the outdoor corridor; the pantograph is installed on the roof main body 41, the minimum distance between the pantograph and the roof structure 4 is greater than 500 mm, and the roof structure 4 forms an insulating layer between the vehicle body assembly and the pantograph.

[0042] Illustratively, the roof main body 41 is used to install the pantograph and high-voltage equipment, and the roof main body 41 insulates and separates the pantograph and high-voltage equipment from the vehicle body assembly; and the guard plate 42 is installed on the left and right sides of the roof main body 41, one end of the guard plate 42 is connected with the roof main body 41, and the other end is inclined upward, the guard plate 42 and the roof main body 41 form a groove structure, the pantograph and high-voltage equipment are half-enclosed in the groove structure, and the guard plate 42 shields above the outdoor corridor, so that the user is also insulated from the pantograph and high-voltage equipment when passing through the outdoor corridor, thereby improving the safety of the user's work. Moreover, the minimum distance between the roof structure 4 and the pantograph is greater than 500 mm, which meets the air insulation requirement. In this way, the shunting locomotive can obtain electric energy as a driving energy source through the pantograph, instead of the traditional diesel engine function, thereby realizing energy cleanization, and the roof structure 4 enables the pantograph and high-voltage equipment to safely operate on the vehicle body assembly, adapt to the working environment, and not affect the work of the workers, thereby ensuring the safety of the work of the workers.

[0043] Illustratively, the guard plate 42 is made of glass fiber reinforced plastic.

[0044] Illustratively, the roof main body 41 and the mechanical room 3 are connected by a threaded fastener, the roof main body 41 is provided with a groove 415 at the edges of the opposite sides along the left-right direction Y, the threaded fastener is inserted into the groove 415 and connects the bottom wall of the groove 415 with the top wall of the mechanical room 3, and the guard plate 42 shields above the groove 415. In this way, after assembly, the threaded fastener made of metal is located in the groove 415, and the guard plate 42 shields the threaded fastener outside the pantograph, so as to ensure the insulation performance. Further, the depth of the groove 415 is greater than the axial length of the threaded fastener, so that the threaded fastener can be withdrawn from the groove 415 without disassembling the guard plate 42 and the roof main body 41, and the roof structure 4 and the vehicle body assembly can be separated.

[0045] Further, the area of the top cover body 41 for installing the pantograph and high-voltage equipment is coated with high-voltage sealing silicone rubber, and the coating thickness is greater than or equal to 5 mm, and the surrounding is bonded with rubber strips for insulation treatment.

[0046] Further, the smooth and flat walkable area of the top cover body 41 is pasted with anti-skid stickers to ensure the safety of the operating personnel.

[0047] Optionally, the top cover body 41 is inclined, and the left and right sides of the top cover body 41 have a height difference, or the middle part of the top cover body 41 is higher than the left and right sides. In this way, the accumulated water at the top can be discharged in time.

[0048] Optionally, the guard plate 42 includes a first plate member 421, a second plate member 422, and a third plate member 423, which are connected in sequence along the front-rear direction X.

[0049] In this way, the guard plate 42 is designed in a split type, and the first plate member 421, the second plate member 422, and the third plate member 423 can be produced and transported, reducing the manufacturing difficulty of the guard plate 42 and the transportation difficulty.

[0050] Specifically, the first plate member 421 is installed at the top of the cab 2, and the mounting points of the first plate member 421 and the cab 2 are located on the same plane, thereby ensuring the processability of installation; the second plate member 422 is installed on both sides of the pantograph in the left-right direction Y, and in the front-rear direction X, the first and second ends of the pantograph are located between the first and second ends of the second plate member 422.

[0051] Further, the outer contour surface 42a of the guard plate 42 is designed to meet the bidirectional visual field requirements of the driver, the first plate member 421 is a horizontal straight line area, the second plate member 422 is a curved transition area, and the third plate member 423 is a vertical straight line area. By optimizing the curve parameters, the visual field requirements of the driver are met.

[0052] Optionally, the connection between the first plate member 421 and the second plate member 422 is in a labyrinth shape and filled with insulating sealant, and / or the connection between the second plate member 422 and the third plate member 423 is in a labyrinth shape and filled with insulating sealant.

[0053] Illustratively, one end of the first plate member 421 in the length direction is in an arch-shaped interface, one end of the second plate member 422 in the length direction is in a corresponding arch-shaped interface, the interface of the first plate member 421 is connected to the interface of the second plate member 422, and the gap between the two is filled with insulating sealant.

[0054] Exemplarily, one end of the length direction of the third plate 423 is in the shape of an arch-shaped interface, the other end of the length direction of the second plate 422 is in the corresponding arch-shaped interface, the interface of the third plate 423 is connected to the interface of the second plate 422, and the gap between the two is filled with insulating sealant.

[0055] Optionally, the protective plate 42 is provided with a mounting hole located on the side of the protective plate 42 facing away from the pantograph in the left-right direction Y, and the connecting piece is inserted into the mounting hole and connected to the top cover body 41.

[0056] Exemplarily, the cross section of the first plate 421 is in the shape of a triangle, the bottom side is attached to the top cover body 41, the inner side faces the pantograph, the outer side faces away from the pantograph, and the outer side is provided with a mounting hole for connecting the connecting piece. The cross section of the second plate 422 is in the shape of a triangle, which can place the mounting point of the top cover body 41 on the outer side and increase the creepage distance. The cross section of the third plate 423 is in the shape of a rectangle, which can increase the creepage distance as much as possible while ensuring the overall shape of the shunting locomotive.

[0057] Optionally, the axial end faces of the mounting hole are provided with steel pads.

[0058] Exemplarily, the connecting piece is a nut and a bolt, the structural strength of the steel pad is greater than that of the protective plate 42, and the area of the steel pad is greater than that of the bolt head and the nut. When the nut is tightened, the concentrated force exerted by the nut / bolt head is dispersed to a larger area, so that the pressure acting on the protective plate 42 is significantly reduced, thereby effectively preventing crushing.

[0059] Optionally, the top cover structure 4 further comprises a protective sleeve, the protective sleeve is sleeved on the end of the connecting piece, and the bottom of the protective sleeve is adhesively and sealingly fixed to the axial end face of the mounting hole.

[0060] Exemplarily, the connecting piece comprises a bolt, a gasket is clamped between the bolt and the protective plate 42, and the protective sleeve comprises a small-diameter section, a medium-diameter section and a large-diameter section along its axial direction. The small-diameter section, the medium-diameter section and the large-diameter section are connected in sequence, the small-diameter section is the top of the protective sleeve, the diameter of the small-diameter section is smaller than the diameter of the nut part of the bolt, the medium-diameter section is sleeved on the nut part, the large-diameter section is the bottom of the protective sleeve, the outer diameter of the large-diameter section is greater than the outer diameter of the gasket, the bottom of the large-diameter section covers the gasket, and the outer circumferential side of the large-diameter section is adhesively and sealingly connected to the axial end face of the mounting hole by means of a silicone rubber adhesive, so as to ensure no gap leakage.

[0061] Specifically, the protective sleeve is made of methyl vinyl silicone rubber which has high pressure resistance.

[0062] Specifically, the length of the large-diameter section is greater than 3mm, which can cover the gasket and ensure no metal bare leakage.

[0063] Specifically, the protective sleeve is 4mm thick to meet the sufficient pressure resistance requirement.

[0064] The accumulated snow forms a continuous cover on the surface of the roof, which reduces the discharge gap between the high-voltage component and the roof, and reduces the insulation performance. Therefore, the area of the roof body 41 for installing the pantograph is embedded with a heating element 43. By arranging the heating element 43, the melting of the snow is accelerated to maintain the insulation performance.

[0065] Optionally, the heating element 43 is a plate structure, and the heating element 43 includes a first composite plate layer 431, a heating layer 432, a sandwich layer 433, and a second composite plate layer 434. The first composite plate layer 431, the heating layer 432, the sandwich layer 433, and the second composite plate layer 434 are stacked in the vertical direction Z in turn. The first composite plate layer 431 and the second composite plate layer 434 are both used for insulation. The heating layer 432 can generate heat. The sandwich layer 433 is in a honeycomb shape, and is located between the heating layer 432 and the vehicle body assembly, and is used to inhibit heat conduction between the heating layer 432 and the vehicle body assembly.

[0066] Optionally, the heating layer 432 is connected with the power supply system of the vehicle body assembly, and temperature adjustment is realized through a temperature control module, so that the heating temperature is maintained within a certain range. In combination with a switch protection module, when it is detected that the local temperature is overheated, the power supply is automatically cut off.

[0067] Optionally, the sandwich layer 433 adopts a honeycomb structure, and the solid part of the honeycomb structure accounts for a small part of the total volume. Heat needs to be transmitted along the honeycomb wall. The honeycomb wall is thin and tortuous, which prolongs the length of heat transmission. The honeycomb wall forms countless heat bridge "breakpoints", so that heat cannot be transmitted as smoothly and linearly as in solid materials. The longer and more tortuous the path is, the greater the thermal resistance is, and the lower the efficiency of heat conduction is.

[0068] Optionally, the roof body 41 includes an outer skin 411, a perimeter frame 412, and a horizontal and vertical support beam 413. The horizontal and vertical support beam 413 is installed in the perimeter frame 412, and the outer skin 411 is installed on the horizontal and vertical support beam 413 and the perimeter frame 412.

[0069] Specifically, the perimeter frame 412 is spliced by a profiled beam and a bent plate. The support beam includes an internal longitudinal and transverse intersecting square tube structure. The axial edge of the support beam is fixed to the inner side wall of the perimeter frame 412 to form a support in the middle of the perimeter frame 412. The outer skin 411 is arranged on the support beam and is installed on the perimeter frame 412, so as to improve the structural strength of the perimeter frame 412.

[0070] Optionally, the area of the roof body 41 for installing the pantograph and the high-voltage equipment is provided with a diagonal support beam.

[0071] Optionally, the roof body 41 is provided with a hanging seat 44 at each corner. The bottom of the hanging seat 44 is provided with a reinforcing plate 45. The four hanging seats 44 are symmetrical to the center line of the length direction of the roof body 41.

[0072] Optionally, the top cover body 41 is provided with a movable sunroof 414, realizing personnel roof operation. And through setting handrails and safety rope equipment, personnel operation safety is ensured.

[0073] The top part reserves sufficient maintenance space for components to be maintained, and through the left channel, high-voltage cable maintenance can be realized; by continuing to cross the high-voltage cable terminal and the pantograph air pipe, along the pantograph edge, the pantograph corner is crossed, and the pantograph can be maintained; by walking along the right channel, the pantograph air pipe is crossed to maintain the roof lightning arrester. By continuing to advance, the air conditioner, loudspeaker and headlight on the top of the adjacent cab 2 can be maintained.

[0074] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, on the basis of the above description, other different forms of changes or variations can also be made. Here, all the embodiments are not required to be exhausted. Any modification, equivalent replacement and improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A switching locomotive characterized by, The utility model relates to a vehicle body assembly, a roof structure and a pantograph. The utility model discloses a vehicle body assembly, which comprises a chassis (1) and a driver's cabin (2) and a mechanical room (3) fixed to the chassis (1), the horizontal side of the driver's cabin (2) forms an outdoor corridor, the mechanical room (3) is arranged along the front-back direction (X) with the driver's cabin (2), and the outdoor corridor is communicated between the chassis (1) and the mechanical room (3). The utility model discloses a roof structure (4), which comprises a roof main body (41) and a guard plate (42), the roof main body (41) is installed on the top of the driver's cabin (2) and the mechanical room (3), the guard plate (42) is installed on the opposite sides of the roof main body (41) along the left-right direction (Y), the guard plate (42) extends along the front-back direction (X), and the side of the guard plate (42) away from the roof main body (41) is inclined upward along the left-right direction (Y), and the guard plate (42) covers the outdoor corridor. The utility model discloses a pantograph installed on the roof main body (41), the minimum distance between the pantograph and the roof structure (4) is greater than 500mm, and the roof structure (4) forms an insulating layer between the vehicle body assembly and the pantograph.

2. The switching locomotive of claim 1, wherein, The guard plate (42) comprises a first plate (421), a second plate (422) and a third plate (423), and the first plate (421), the second plate (422) and the third plate (423) are sequentially connected along the front-back direction (X).

3. The switching locomotive of claim 2, wherein, The connection between the first plate (421) and the second plate (422) is in a labyrinth shape and filled with insulating sealant, and / or the connection between the second plate (422) and the third plate (423) is in a labyrinth shape and filled with insulating sealant.

4. The switching locomotive of claim 1, wherein, The guard plate (42) is provided with a mounting hole located on the side of the guard plate (42) away from the pantograph along the left-right direction (Y), a connecting piece is inserted into the mounting hole and connected with the roof main body (41).

5. The switching locomotive of claim 4, wherein, The axial end faces of the mounting hole are provided with steel pads.

6. The switching locomotive of claim 4, wherein, The roof structure (4) further comprises a sheath, the sheath is sleeved on the end of the connecting piece, and the bottom of the sheath is adhesively sealed and fixed with the axial end face of the mounting hole.

7. The switching locomotive of claim 1, wherein, The area of the roof main body (41) for installing the pantograph is embedded with a heating piece (43).

8. The switching locomotive of claim 7, wherein, The heating piece (43) is a plate structure, which comprises a first composite plate layer (431), a heating layer (432), a sandwich layer (433) and a second composite plate layer (434), the first composite plate layer (431), the heating layer (432), the sandwich layer (433) and the second composite plate layer (434) are sequentially stacked along the vertical direction (Z), the first composite plate layer (431) and the second composite plate layer (434) are used for insulation, the heating layer (432) can generate heat, the sandwich layer (433) is in a honeycomb shape, and the sandwich layer (433) is located between the heating layer (432) and the vehicle body assembly and used for inhibiting heat conduction between the heating layer (432) and the vehicle body assembly.

9. The switching locomotive of claim 1, wherein, The top cover body (41) is inclined, and the left and right sides of the top cover body (41) are different in height, or the middle part of the top cover body (41) is higher than the left and right sides.

10. The switching locomotive of claim 1, wherein, The top cover body (41) comprises an outer skin (411), a circumferential frame (412) and horizontal and vertical support beams (413), the horizontal and vertical support beams (413) are installed in the circumferential frame (412), and the outer skin (411) is installed on the horizontal and vertical support beams (413) and the circumferential frame (412).

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