CN212423099U

CN212423099U - Depressed center track flatcar of area leveling function

Info

Publication number: CN212423099U
Application number: CN202020352903.7U
Authority: CN
Inventors: 刘飞香; 张英杰; 陶小虎
Original assignee: CRCC High Tech Equipment Corp Ltd
Current assignee: CRCC High Tech Equipment Corp Ltd; China Railway Chengdu Rail Transit Health Management Technology Co Ltd
Priority date: 2019-10-16
Filing date: 2020-03-19
Publication date: 2021-01-29
Anticipated expiration: 2030-03-19

Abstract

The utility model relates to a depressed center track flatcar with leveling function, which comprises a car coupler buffer device (1), a bogie (2), a braking system (3), a car frame (4), a rotatable mounting base (5), an electrical system (6) and a hydraulic system (7), wherein the middle of the car frame (4) is depressed into a depressed part (43); the bogie (2) and the frame (4) form the foundation of the flat car, and on the basis, a car hook, a braking system (3), a rotatable mounting base (5), an electrical system (6) and a hydraulic system (7) are mounted for leveling. The frame (4) is concave at the longitudinal middle part, so that the bearing height is lower than that of a common flat car, and the allowable size in the height direction of a bearing working device is increased; the rotatable installation base (5) is provided with a mechanical locking device, so that the safety of the base when the flat car runs in a coupling mode is guaranteed, and the safety of a working device installed on the base is guaranteed.

Description

Depressed center track flatcar of area leveling function

Technical Field

The utility model relates to a railway maintenance of equipment technical field particularly, relates to a take depressed center track flatcar of leveling function.

Background

The maintenance of railway and urban railway lines requires various equipments. To meet the increasingly complex maintenance requirements, new and inventive or other field work devices are being moved to rail-mounted installations for performing maintenance operations. The new working device has strong functions, but generally has the limitations of large size (especially the size in height), high requirements on stability, overturn prevention capability and levelness of an installation base during operation, and the like.

In order to meet the requirement of large size of the working device in height, an unconventional small-wheel-diameter rail type device is generally adopted as a carrying platform. But the small wheel track type equipment has the problems of low construction speed and inconvenient connection with the conventional railway vehicle.

To satisfy the high requirement of installation base stability during the equipment operation of work, set up scalable landing leg in order to improve stability usually. The supporting legs extend out before operation to integrally lift the rail-mounted equipment, rigid connection between the rail-mounted equipment and a line is realized, and the supporting legs retract after operation is completed. Before the telescopic supporting legs are jacked, the bogie and the frame need to be bound to prevent the bogie from falling off, and the preparation time is long; the telescopic supporting legs need to occupy line positions, and operation cannot be performed in an interval with a large number of line auxiliary equipment.

The legs can be extended laterally outward to improve the overturn resistance of the rail-mounted equipment, which also has the above-mentioned problems.

On an ultrahigh line, the extension amounts of the supporting legs on the two transverse sides are different, the rail-mounted equipment is adjusted to be horizontal or a leveling installation base is arranged on the rail-mounted equipment, and only the installation base is adjusted to meet the requirement of a working device on the levelness of an installation base.

For example, the invention patent application with the application publication number CN107458404A discloses a depressed center flat car, which meets the transportation requirements of large and large goods by arranging a car frame into a depressed center structure. Through the optimization to concave underframe transition department, solve the easy problem that ftractures and collapses of concave underframe. The flat car is mainly aimed at transporting over-limit goods, but not providing a mounting base for working devices with special requirements.

Also for example, patent publication No. CN103359132B discloses an axle box suspension for a bogie of a railway machine, a corresponding axle box, a bogie and a railway machine. The axle support oil cylinder arranged in the side frame of the bogie frame is used for eliminating the elastic suspension of the axle box, so that the rigid suspension requirement of large-scale road maintenance machinery during running is met. This approach eliminates the elastic suspension of the axle boxes, but the elasticity of the side bearings remains and the frame is not completely rigidly connected to the track rails.

The utility model discloses a grant publication No. CN203638982U, it discloses a hoist levelling device. This patent is through setting up the base, connecting the leveling support of base and frame, being used for adjusting and locking the extension mechanism of base angle, realizes adjusting to arbitrary angle in the design angle scope to carry out the safety locking when the operation. This patent base swivelling joint board is located the frame top, is unfavorable for reducing the base height.

An invention patent with an assigned publication number of CN102602823B discloses a leveling mechanism of a construction machine. The leveling rotary table, the leveling oil cylinder support frame and the adjustable position locking device are arranged, so that the problems that a working device or an object is difficult to put away and put away when an outer rail of a railway line is ultrahigh, a double-arm crane cannot rotate, a train is easy to derail when a hydraulic support leg is retracted and the like are solved. The rotary supporting plate of the patent base is positioned above the frame, and is also not beneficial to reducing the height of the base; the stroke of the adjusting oil cylinder is large, and the mounting distance is large.

Disclosure of Invention

In order to solve the technical defect existing in the prior art, the utility model aims to provide a take depressed center track flatcar of leveling function, this flatcar is applicable to bear the size (especially direction of height size) big, have the large-scale equipment of higher requirement to the stability of installation base, anti-overturning ability, levelness, for example high accuracy heavy load arm.

In order to realize the above design purpose, the utility model discloses a scheme as follows:

the utility model provides a depressed center rail flatcar with leveling function, which comprises a car coupler buffer device, a bogie, a braking system, a car frame, a leveling installation base, an electrical system and a hydraulic system, wherein the middle of the car frame is depressed to form a depressed part; the bogie and the frame form the foundation of the flat car, and a car hook, a braking system, a leveling installation base, an electrical system and a hydraulic system are installed on the foundation. The frame is concave at the longitudinal middle part, so that the bearing height lower than that of a common flat car is provided, and the allowable size in the height direction of a bearing working device is increased; the mechanical locking device is arranged on the leveling mounting base, so that the safety of the base when the flat wagon runs in a coupling mode is guaranteed, and the safety of a working device mounted on the base is guaranteed.

Preferably, the recessed portion is provided with a rectangular opening to provide a mounting space for the adjustable flat base.

In any of the above schemes, preferably, the two longitudinal ends of the rectangular opening are provided with rotating shaft mounting holes to reduce the height of the mounting base.

In any of the above aspects, preferably, the frame is provided with interfaces at both ends thereof for connecting to a bogie and a coupler buffer.

In any of the above schemes, preferably, the bogie is a two-axle bogie provided with a series of suspensions, which meets the requirements of the flat car on the speed and the damping function during the operation of the tandem suspension; the bogie is provided with a jacking shaft oil cylinder and a jacking oil cylinder. When the working device works, the jacking oil cylinder extends out to rigidly connect the bogie frame with the wheel set, and the jacking oil cylinder extends out to rigidly connect the bogie frame with the vehicle frame, so that the wheel set is rigidly connected with the vehicle frame, the vehicle frame is rigidly connected with the line steel rail, and the rigidity of the mounting base of the working device is ensured.

In any of the above schemes, preferably, the leveling mounting base includes a base, a mechanical locking device, a leveling cylinder, an angle detection device, and a rotation shaft.

In any of the above schemes, preferably, the leveling mounting base is installed at a rectangular opening of a recessed portion of the frame, and is connected with the frame by a rotating shaft, so that the base can rotate around a longitudinal axis on the frame.

In any of the above schemes, preferably, the base is provided with a threaded hole and a boss structure, so that the working device can be conveniently aligned and fastened.

In any of the above schemes, preferably, one end of the rotating shaft is provided with a step, the rotating shaft penetrates through the mounting hole on the frame and then is inserted into the mounting hole on the base, and then the rotating shaft is limited axially by the locking nut.

In any of the above schemes, preferably, the rotating shaft is in transition fit with the mounting hole on the frame, and is in transition with the mounting hole on the base through a composite bushing, and a grease nipple is arranged.

In any of the above schemes, preferably, the rotating shaft is installed at two longitudinal front and rear positions of the rectangular opening, so as to facilitate installation and maintenance.

In any of the above schemes, preferably, the front end of the leveling cylinder is hinged with the lug seat on the base through a joint bearing; the rear end of the leveling oil cylinder is hinged with an ear seat on the frame through a joint bearing, and the oil cylinder with the rear end installation end positioned in the middle of the cylinder barrel is adopted, so that the installation distance of the leveling oil cylinder is reduced.

In any of the above schemes, preferably, the leveling cylinders are installed on the same side or on two lateral sides to balance the difference of the bearing capacity of the large and small cavities, and improve the capability of the leveling cylinders to keep the state of the leveling installation base when the working device works. The quantity of the oil cylinders is not fixed, and the oil cylinders are increased and decreased according to the requirements of the working device.

In any of the above schemes, preferably, the angle detection device is installed on the base, and is used for monitoring the horizontal angle of the installation base in real time, so as to provide a basis for leveling.

In any of the above schemes, preferably, the mechanical locking device is composed of a holed fork-shaped seat, a locking plate, a locking pin and a locking pin oil cylinder, and is used for locking the mounting base and the frame when the mounting base does not need to be adjusted.

In any of the above aspects, preferably, the holed fork seat is welded to the frame; the locking plate is welded on the base, and after the alignment of the holes of the porous fork-shaped seat and the locking plate is completed, the locking pin oil cylinder drives the locking pin to penetrate through the porous fork-shaped seat and the locking plate to realize mechanical locking; the front end of the locking pin is conical so as to be convenient for positioning and inserting into the locking hole, and the locking pin is extended normally and retracted during operation.

In any of the above solutions, it is preferable that the mechanical locking device further includes a contact switch, and the flatcar is allowed to run in tandem only after the locking pin is detected to be extended to the proper position.

In any of the above schemes, preferably, the coupler buffering device is a general 13B top-acting coupler with a buffer, so that longitudinal impact during flat car marshalling is reduced, and the requirement of a working device on longitudinal acceleration is met.

In any of the above aspects, it is preferable that the brake system includes a service brake and a parking brake. The influence of empty and heavy vehicles is fully considered in the service braking, and the normal braking in the flat vehicle service process is ensured; and the parking brake ensures that the flat car does not slide when being parked.

In any of the above schemes, preferably, the electrical system is located at the end of the flatcar, does not occupy the space of the concave part, and is used for controlling the extension, retraction and locking of each oil cylinder.

In any of the above schemes, preferably, the hydraulic system 7 is located at the end of the flatcar, does not occupy the space of the concave part, and is composed of a hydraulic pump station and a hydraulic loop; the hydraulic pump station is driven by an external power supply and can be driven by a diesel engine set. The hydraulic system has a self-locking function, and the oil cylinder is locked after acting in place so as to keep the state of the frame and the adjustable and level mounting base.

The utility model discloses need to install base rigid support and horizontally equipment to the requirement of installation base during can satisfying high big, operation. The utility model discloses a rigid support, levelling device all establish inside the flatcar, do not need the occupation circuit space, fast, the circuit adaptation sky can the reinforce of taking one's place. The leveling mounting base is driven by the oil cylinder to rotate and is matched with the angle detection device arranged on the base, so that the leveling operation is simple and convenient, and the accuracy is high.

1. The upper limit of the size of the working device arranged on the rail-mounted equipment in the height direction is improved, and the working device is beneficial to transplanting more working devices in other fields to the rail-mounted equipment for use so as to develop more new products.

2. The technical scheme that the bogie provided with the jacking oil cylinder and the jacking oil cylinder is used for realizing rigid connection between the working device installation base and the line is provided. The support mechanism does not need to be extended to the line, the vehicle can be parked at any required position, and the parking device is particularly suitable for the line provided with the accessory equipment.

3. The technical scheme that the oil cylinder drives the mounting base capable of rotating around the longitudinal direction so as to realize the leveling of the working device is provided. The angle detection device is installed on the base in a matched mode, leveling operation is simple and convenient, and accuracy is high.

4. The utility model is suitable for a national railway more is applicable to the urban rail that the boundary limit is little, line condition is poor, operation skylight point is short.

Drawings

Fig. 1 is a schematic structural view of a depressed center rail flatcar with leveling function according to the present invention.

Fig. 2 is a schematic structural diagram of a frame in the preferred embodiment shown in fig. 1 of the depressed center rail flatcar with leveling function according to the present invention.

Fig. 3 is a schematic structural view of a bogie in the embodiment shown in fig. 1 of the depressed center rail flatcar with leveling function according to the present invention.

Fig. 4 is a schematic structural view of the leveling mounting base in the embodiment of fig. 1 of the depressed center rail flatcar with leveling function according to the present invention.

Fig. 5 is a front cut-away view of the embodiment of fig. 4 of a depressed center rail flatcar with leveling according to the present invention.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, from which other embodiments can be derived by a person skilled in the art without inventive effort.

As shown in fig. 1, the structure of the depressed center rail flatcar with leveling function according to the present invention is schematically illustrated. The utility model discloses a depressed center track flatcar of area leveling function, including coupling buffer 1, bogie 2, braking system 3, frame 4, but leveling installation base 5, electric system 6 and hydraulic system 7, the middle concave down of frame 4 is concave down position 43; the bogie 2 and the frame 4 form the foundation of the flat car, and a car hook, a braking system 3, a leveling installation base 5, an electric system 6 and a hydraulic system 7 are installed on the foundation. The frame 4 is concave at the longitudinal middle part, so that the bearing height is lower than that of a common flat car, and the allowable size in the height direction of a bearing working device is increased; the mechanical locking device is arranged on the leveling installation base 5, so that the safety of the base when the flat car runs in a coupling mode is guaranteed, and the safety of a working device installed on the base is guaranteed.

The utility model relates to a flatcar when using, if the circuit does not have the superelevation or the inclination that the superelevation produced is in equipment allowed range. The flatcar is connected with the trailer and runs to an operation place and is braked, the electric system 6 is operated, the jacking shaft oil cylinder 31 and the jacking oil cylinder 32 extend in place and are locked, the frame is rigidly connected with the line steel rail, and the working device starts to operate. And after the operation is finished, the working device is retracted and locked. And operating the electric system 6, retracting the top shaft oil cylinder 31 and the top vehicle oil cylinder 32, recovering the normal suspension of the bogie, and running the flat vehicle to the next operation point or returning to the operation and maintenance base.

As shown in fig. 2, the structure of the frame of the depressed center rail flatcar with leveling function in the preferred embodiment shown in fig. 1 according to the present invention is schematically illustrated.

In this embodiment, the recessed portion 43 is opened with a rectangular opening 42 to provide a mounting space for the adjustable flat base.

In this embodiment, the two longitudinal ends of the rectangular opening 42 are provided with the rotating shaft mounting holes 41 to reduce the height of the mounting base.

In this embodiment, interfaces for connecting the bogie 2 and the coupler draft gear 1 are provided at both ends of the vehicle frame 4.

Referring next to fig. 3, a schematic diagram of the bogie in the embodiment of fig. 1 of the depressed center rail flatcar with leveling according to the present invention is shown.

In this embodiment, the bogie 2 is a two-axle bogie and is provided with a series of suspensions, so as to meet the requirements of the flat car on the speed and the damping function during the operation of the continuous trailer; the bogie 2 is provided with a head-axle cylinder 31 and a head-car cylinder 32. When the working device works, the jacking oil cylinder 31 extends out to rigidly connect the bogie frame with the wheel set, and the jacking oil cylinder 32 extends out to rigidly connect the bogie frame with the frame, so that the wheel set is rigidly connected with the frame, the frame is rigidly connected with the line steel rail, and the rigidity of the mounting base of the working device is ensured.

Finally, referring to fig. 4 and 5, a structural schematic diagram of the leveling mounting base in the embodiment of fig. 1 of the depressed center rail flatcar with leveling function according to the present invention is shown.

In the present embodiment, the leveling mounting base 5 includes a base 51, a mechanical locking device 52, a leveling cylinder 53, an angle detection device 54, and a rotation shaft 55.

In this embodiment, the adjustable mounting base 5 is mounted in a rectangular opening 42 of the recessed portion 43 of the frame 4, and is connected to the frame 4 by a rotating shaft 55, so that the base 51 can rotate on the frame 4 about a longitudinal axis.

In this embodiment, the base 51 is provided with a threaded hole and a boss structure, so as to facilitate the alignment and fastening of the working device.

In this embodiment, the rotating shaft 55 has a step at one end, passes through the mounting hole 41 of the frame 4, is inserted into the mounting hole of the base 51, and is axially limited by the lock nut.

In this embodiment, the rotating shaft 55 is in transition fit with the mounting hole on the frame 4, and is in transition with the mounting hole on the base 51 through a composite bushing, and a grease nipple is arranged.

In this embodiment, the rotating shaft 55 is installed at two positions in the front and rear of the rectangular opening 42 in the longitudinal direction, so as to facilitate installation and maintenance.

In the embodiment, the front end of the leveling cylinder 53 is hinged with an ear seat on the base 51 through a joint bearing; the rear end of the leveling oil cylinder 53 is hinged with an ear seat on the frame 4 through a joint bearing, and the oil cylinder with the rear end installation end positioned in the middle of the cylinder barrel is adopted, so that the installation distance of the leveling oil cylinder 53 is reduced.

In this embodiment, the leveling cylinders 53 are installed on the same side or on both sides in the transverse direction, so as to balance the difference in the bearing capacity of the large and small cavities, and improve the capability of the leveling cylinders 53 to maintain the state of the leveling installation base 5 during the operation of the working device. The quantity of the oil cylinders is not fixed, and the oil cylinders are increased and decreased according to the requirements of the working device.

In this embodiment, the angle detecting device 54 is installed on the base 51, and is used for monitoring the horizontal angle of the installation base in real time, so as to provide a basis for leveling.

In this embodiment, the mechanical locking device 52 is composed of a fork-shaped seat with holes, a locking plate, a locking pin and a locking pin cylinder, and is used for locking the mounting base 5 with the frame 4 when the mounting base does not need to be adjusted.

In this embodiment, the holed fork seat is welded to the frame 4; the locking plate is welded on the base 51, and after the alignment of the holes of the porous fork-shaped seat and the locking plate is completed, the locking pin oil cylinder drives the locking pin to penetrate through the porous fork-shaped seat and the locking plate to realize mechanical locking; the front end of the locking pin is conical so as to be convenient for positioning and inserting into the locking hole, and the locking pin is extended normally and retracted during operation.

In this embodiment, the mechanical locking device 52 further includes a contact switch, and the flatcar is allowed to run in tandem only after detecting that the locking pin is extended to the proper position.

In this embodiment, the coupler buffering device 1 is a general 13B top-acting coupler with a buffer, so that longitudinal impact during flat car marshalling is reduced, and the requirement of a working device on longitudinal acceleration is met.

In the present embodiment, the braking system 3 includes a service brake and a parking brake. The influence of empty and heavy vehicles is fully considered in the service braking, and the normal braking in the flat vehicle service process is ensured; and the parking brake ensures that the flat car does not slide when being parked.

In this embodiment, the electrical system 6 is located at the end of the flatcar, does not occupy the space of the recessed portion 43, and is used for controlling the extension, retraction and locking of each cylinder.

In this embodiment, the hydraulic system 7 is located at the end of the flatcar, does not occupy the space of the concave portion 43, and is composed of a hydraulic pump station and a hydraulic circuit; the hydraulic pump station is driven by an external power supply and can be driven by a diesel engine set. The hydraulic system has a self-locking function, and the oil cylinder is locked after acting in place so as to keep the state of the frame 4 and the adjustable-level mounting base 5.

As shown in fig. 1-5, when the flatcar of the present invention is used, if the line is too high, the inclination angle exceeds the allowable range of the working device. The flatcar is connected with the trailer and runs to an operation place and is braked, the electric system 6 is operated, the jacking shaft oil cylinder 31 and the jacking oil cylinder 32 extend in place and are locked, and the frame is rigidly connected with the line steel rail. It should be emphasized that the leveling of the leveling-adjustable mounting base 5 is allowed only after the jack cylinder 31 and the lift cylinder 32 are extended to the right position and locked. The locking pin cylinder of the mechanical locking device 52 drives the locking pin to retract, the leveling cylinder 53 starts to act according to the reading of the angle detection device 54, the reading of the angle detection device 54 is continuously observed until the angle of the mounting support meets the requirement of the working device, then the leveling cylinder 53 is locked, and the working device starts to work. After the operation is finished, the working device is retracted and locked, the electric system 6 is operated, the leveling oil cylinder 53 starts to act according to the reading of the angle detection device 54, the reading of the angle detection device 54 is continuously observed until the angle of the mounting support meets the requirement of the mechanical locking device 52, then the locking pin oil cylinder extends out, the leveling mounting base 5 and the frame 4 are locked, and finally the leveling oil cylinder 53 is locked. The jacking shaft oil cylinder 31 and the jacking car oil cylinder 32 retract, the bogie returns to be suspended normally, and the flat car runs to the next operation point or returns to an operation and maintenance base.

The utility model has the advantages of it is following:

1. the application of the depressed center flat car in the non-pure transportation field of carrying large-scale working devices and the like;

2. the concave bottom flat car with the rigid connection between the car frame and the line is realized by utilizing the steering of the oil cylinder with the top car and the oil cylinder with the top shaft;

3. the mounting base which can rotate around a longitudinal shaft is driven by an oil cylinder to realize the transverse horizontal concave bottom flat wagon of the carried working device;

4. the oil cylinder with the rear end mounting end positioned in the middle of the cylinder barrel is adopted to reduce the mounting distance of the oil cylinder;

5. the adjustable flat base rotation point is located on the frame cross beam to reduce the base height.

The utility model discloses have following alternative:

1. the utility model discloses in, the rotatory hydro-cylinder of drive base can be replaced by flexible actuating mechanism such as electric putter.

2. The utility model discloses in, leveling device mechanical locking device can be replaced by mechanisms such as telescopic stopper.

As can be readily understood by those skilled in the art, the depressed center rail flatcar with leveling function of the present invention includes any combination of the parts in the present specification. These combinations are not described in detail herein for the sake of brevity and clarity, but the scope of the invention, which is defined by any combination of parts or features disclosed herein, will become apparent after a review of this specification.

Claims

1. The utility model provides a take depressed center track flatcar of leveling function, includes coupling buffer (1), bogie (2), braking system (3), frame (4), but leveling installation base (5), electrical system (6) and hydraulic system (7), its characterized in that: the middle of the frame (4) is recessed into a recessed part (43); the bogie (2) and the frame (4) form the foundation of the flat car, and the car hook, the braking system (3), the leveling installation base (5), the electrical system (6) and the hydraulic system (7) are installed on the foundation.

2. The depressed center rail flatcar with leveling function of claim 1, wherein: the concave part (43) is provided with a rectangular opening (42).

3. The depressed center rail flatcar with leveling function of claim 2, wherein: the two longitudinal ends of the rectangular opening (42) are provided with rotating shaft mounting holes (41).

4. The depressed center rail flatcar with leveling function of claim 1, wherein: and interfaces connected with the bogie (2) and the car coupler buffer device (1) are arranged at two ends of the car frame (4).

5. The depressed center rail flatcar with leveling function of claim 1, wherein: the bogie (2) is a two-shaft bogie; the bogie (2) is provided with a jacking shaft oil cylinder (31) and a jacking oil cylinder (32).

6. The depressed center rail flatcar with leveling function of claim 1, wherein: the leveling installation base (5) comprises a base (51), a mechanical locking device (52), a leveling oil cylinder (53), an angle detection device (54) and a rotating shaft (55).

7. The depressed-bottom track flatcar with leveling function of claim 6, wherein: the leveling installation base (5) is arranged at a rectangular opening (42) of a concave part (43) of the frame (4) and is connected with the frame (4) through a rotating shaft (55).

8. The depressed-bottom track flatcar with leveling function of claim 6, wherein: the base (51) is provided with a threaded hole and a boss structure.

9. The depressed-bottom track flatcar with leveling function of claim 6, wherein: one end of the rotating shaft (55) is provided with a step, penetrates through the mounting hole (41) on the frame (4) and then is inserted into the mounting hole on the base (51), and then is axially limited by a locking nut.

10. Depressed center rail flatcar with leveling function according to claim 6 or 9, characterized in that: the rotating shaft (55) is in transition fit with the mounting hole on the frame (4), a composite bushing is arranged between the rotating shaft and the mounting hole on the base (51) for transition, and a grease nozzle is arranged.

11. Depressed center rail flatcar with leveling function according to claim 6 or 9, characterized in that: the rotating shafts (55) are installed at the front and rear positions in the longitudinal direction of the rectangular opening (42).

12. The depressed-bottom track flatcar with leveling function of claim 6, wherein: the front end of the leveling oil cylinder (53) is hinged with an ear seat on the base (51) through a joint bearing; the rear end of the leveling oil cylinder (53) is hinged with an ear seat on the frame (4) through a joint bearing, and the oil cylinder is of a structure form that the mounting end at the rear end is positioned in the middle of the cylinder barrel.

13. The depressed-bottom track flatcar with leveling function of claim 6, wherein: the leveling oil cylinders (53) are arranged on the same side or on two transverse sides.

14. The depressed-bottom track flatcar with leveling function of claim 6, wherein: the angle detection device (54) is mounted on the base (51).

15. The depressed-bottom track flatcar with leveling function of claim 6, wherein: the mechanical locking device (52) consists of a fork-shaped seat with a hole, a locking plate, a locking pin and a locking pin oil cylinder.

16. A depressed center rail flatcar with leveling function as claimed in claim 15, wherein: the forked seat with the holes is welded on the frame (4); the locking plate is welded on the base (51); the front end of the locking pin is conical.

17. Depressed center rail flatcar with leveling function according to claim 6 or 15, characterized in that: the mechanical locking device (52) also comprises a contact switch.

18. The depressed center rail flatcar with leveling function of claim 1, wherein: the coupler buffer device (1) adopts a general 13B upper acting coupler and is provided with a buffer.

19. The depressed center rail flatcar with leveling function of claim 1, wherein: the brake system (3) comprises a service brake and a parking brake.

20. The depressed center rail flatcar with leveling function of claim 1, wherein: the electrical system (6) is located at the end of the flatcar.

21. The depressed center rail flatcar with leveling function of claim 1, wherein: the hydraulic system (7) is positioned at the end part of the flat car and consists of a hydraulic pump station and a hydraulic loop; the hydraulic pump station is driven by an external power supply and can be driven by a diesel engine set.