阅读说明：本技术 凹底架以及铁路凹底车 (Concave underframe and railway concave bottom car ) 是由 徐冬华 刘凤伟 汤楚强 李晓军 吴宇波 沈鹏 周欢 张金发 王丽娜 闫瑞 陈洪涛 于 2020-11-27 设计创作，主要内容包括：本发明属于铁路货车技术领域,尤其涉及一种凹底架以及铁路凹底车。其中的凹底架包括端臂组成以及承载梁组成,所述端臂组成沿纵向相对设置有两个,所述承载梁组成设置在两个所述端臂组成之间,所述承载梁组成的端部和同端的所述端臂组成连接,所述端臂组成和所述承载梁组成均为底部敞口的非封闭腔结构,所述空气制动系统设置在所述凹底架的底部的非封闭腔结构内。本发明具有结构简单经济,生产制造简便的特点,便于单制动缸和单闸调器制动系统的布置安装、调试、维护,使得制动更加的安全可靠,实用性能强。(The invention belongs to the technical field of railway wagons, and particularly relates to a concave underframe and a railway concave car. The concave underframe comprises two end arm assemblies and two bearing beams, the two end arm assemblies are arranged oppositely along the longitudinal direction, the bearing beams are arranged between the two end arm assemblies, the end parts of the bearing beams and the end arm assemblies at the same end are connected, the end arm assemblies and the bearing beams form a non-closed cavity structure with an open bottom, and the air braking system is arranged in the non-closed cavity structure at the bottom of the concave underframe. The invention has the characteristics of simple and economic structure and simple and convenient production and manufacture, is convenient for the arrangement, the installation, the debugging and the maintenance of the single brake cylinder and the single brake modulator brake system, ensures that the brake is safer and more reliable, and has strong practicability.)

1. A female chassis, comprising:

the bearing beam comprises end arm assemblies (1.1) and bearing beam assemblies (1.2), wherein the number of the end arm assemblies (1.1) is two along the longitudinal direction, the bearing beam assemblies (1.2) are arranged between the two end arm assemblies (1.1), the end parts of the bearing beam assemblies (1.2) are connected with the end arm assemblies (1.1) at the same end, and the end arm assemblies (1.1) and the bearing beam assemblies (1.2) are both of a non-closed cavity structure with an open bottom;

air brake system (2), air brake system (2) set up in the non-closed chamber structure of the bottom of concave chassis, air brake system (2) include that the pull rod constitutes, brake modulator (2.4), brake cylinder (2.6) and lever are constituteed, wherein:

the number of the pull rod assemblies is two, the two pull rod assemblies are symmetrically arranged along the longitudinal central line of the concave underframe, the pull rod assemblies and the end arm assemblies (1.1) are correspondingly arranged, and each pull rod assembly comprises an end pull rod (2.1), a vertical lever (2.2) and a middle pull rod ((2.3);

one end of each end pull rod (2.1) formed by the pull rods is rotatably connected with the input end of the brake mechanism of the bogie (3) on the same side, the other end of each end pull rod (2.1) is rotatably connected with the middle of the vertical lever (2.2), the upper part of each vertical lever (2.2) is rotatably connected with the corresponding end arm assembly (1.1), and the lower part of each end pull rod (2.1) is rotatably connected with one end of the middle pull rod (2.3);

the brake cylinder (2.6) is fixedly arranged on the bottom of the bearing beam assembly (1.2), and the output end of the brake cylinder (2.6) can be extended and contracted along the longitudinal direction;

the lever is constituteed including two connecting rod (2.8) that set up relatively, two the middle part of connecting rod (2.8) is through middle part pull rod (2.10) rotatable coupling, two the one end of connecting rod (2.8) respectively with the both ends rotatable coupling of brake jar (2.6), one the other end of connecting rod (2.8) respectively with the homonymy the pull rod is constituteed the other end of middle pull rod (2.3) and a connector rotatable coupling of one side of brake modulator (2.4), another the other end of connecting rod (2.8) with another connector rotatable coupling of one side of brake modulator (2.4), the connector of the opposite side of brake modulator (2.4) and the opposite side the pull rod is constituteed the other end rotatable coupling of middle pull rod (2.3).

2. A recessed undercarriage according to claim 1, characterised in that each of said end arm assemblies (1.1) comprises an end beam (1.1.1), a trailing beam (1.1.2), a side beam (1.1.3), an end arm upper cover plate (1.1.4), a tread plate (1.1.5), wherein:

the traction beam (1.1.2) is arranged along the longitudinal direction, the side beams (1.1.3) are oppositely arranged along the transverse direction, and the two side beams (1.1.3) are respectively arranged at the two transverse sides of the traction beam (1.1.2);

the middle part of the end beam (1.1.1) is vertically arranged at one longitudinal end of the traction beam (1.1.2), two ends of the end beam (1.1.1) are respectively arranged at one longitudinal end of the two side beams, the traction beam (1.1.2), the end beam (1.1.1) and the two side beams (1.1.3) form an end arm frame, and the end arm frame is provided with a horizontal supporting part and an oblique supporting part;

the pattern plate (1.1.5) is arranged on the top surface of the horizontal supporting part of the end arm frame;

the end arm upper cover plate (1.1.4) is arranged on the top surface of the oblique supporting part of the end arm frame, and the end arm upper cover plate (1.1.4) and the pattern plate (1.1.5) are fixedly connected into a whole.

3. A recessed chassis according to claim 2, characterized in that the end of the checkered plate (1.1.5) facing the end arm upper cover plate (1.1.4) is provided with a plurality of plug welding holes at intervals, and the checkered plate (1.1.5) is welded with the end arm upper cover plate (1.1.4) through the plurality of plug welding holes.

4. A recessed undercarriage according to claim 2, characterized in that the load beam assembly (1.2) comprises a centre beam assembly (1.2.1), a cross beam assembly (1.2.2), a side beam assembly (1.2.3) and an iron floor (1.2.6), wherein:

the middle beam assembly (1.2.1) is arranged along the longitudinal direction, and the end part of the middle beam assembly (1.2.1) is connected with the other longitudinal end of the traction beam (1.1.2) at the same end;

the two side beam assemblies (1.2.3) are oppositely arranged along the transverse direction, the two side beam assemblies (1.2.3) are respectively arranged at the two transverse sides of the middle beam assembly (1.2.1), the side beam assemblies (1.2.3) and the side beams (1.1.3) are correspondingly arranged, and the end parts of the side beam assemblies (1.2.3) are connected with the other longitudinal ends of the side beams (1.1.3) at the same end;

the beam assemblies (1.2.2) are arranged at intervals along the longitudinal direction, the middle part of each beam assembly (1.2.2) is connected to the bottom of the middle beam assembly (1.2.1), two ends of each beam assembly (1.2.2) are fixedly lapped on the two side beam assemblies (1.2.3), and the middle beam assembly (1.2.1), the two side beam assemblies (1.2.3) and the beam assemblies (1.2.2) enclose a bearing beam frame;

the iron floor (1.2.6) is fixedly arranged on the top surface of the bearing beam frame, and the longitudinal two ends of the iron floor (1.2.6) are respectively and fixedly connected with the end arm upper cover plates (1.1.4) of the two end arm assemblies (1.1).

5. The female chassis according to claim 4, characterized in that said end arm assembly (1.1) further comprises an upper connection plate (1.1.6) and a lower connection plate (1.1.7), wherein:

the upper connecting plate (1.1.6) and the lower connecting plate (1.1.7) are both arranged in parallel with the middle beam assembly (1.2.1), and the upper connecting plate (1.1.6) and the lower connecting plate (1.1.7) are arranged on the same plumb plane;

the upper connecting plate (1.1.6) is arranged at the upper part of the iron floor (1.2.6), and the end arm upper cover plate (1.1.4) is connected with the iron floor (1.2.6) through the upper connecting plate (1.1.6); the lower connecting plate (1.1.7) is arranged at the lower part of the iron floor (1.2.6), and the middle beam assembly (1.2.1) is connected with the iron floor (1.2.6) through the lower connecting plate (1.1.7).

6. The recessed undercarriage according to claim 5, wherein the load beam assembly (1.2) further comprises a side gusset (1.2.4) and a side stiffener plate (1.2.5), wherein:

the side reinforcing plates (1.2.5) are two, the two side reinforcing plates (1.2.5) are respectively arranged at the lower parts of the two transverse sides of the iron floor (1.2.6), the side reinforcing plates (1.2.5) are positioned at the same side of the transverse outer side of the side beam component (1.2.3), and each side reinforcing plate (1.2.5) is connected with the side beam component (1.2.3) at the same side through a plurality of side rib plates (1.2.4) arranged at intervals.

7. A recessed chassis according to claim 2, characterised in that the upper part of the upright lever (2.2) of the tie rod assembly is pivotally connected to the trailing beam (1.12) of the corresponding end arm assembly (1.1).

8. The concave underframe according to claim 4, characterized in that the brake cylinder (2.6) is fixedly arranged on the back of the iron floor (1.2.6) of the carrier beam assembly (1.2).

9. The female chassis according to claim 3, characterized in that the air brake system (2) further comprises an air reservoir (2.7) and a control valve (2.9), the air reservoir (2.7) and the control valve (2.9) being fixedly arranged on the bottom of the carrier beam assembly (1.2), the air reservoir (2.7) and the brake cylinder (2.6) being connected by a pipeline, the control valve (2.9) being arranged on the pipeline connecting the air reservoir (2.7) and the brake cylinder (2.6).

10. A railroad depressed center vehicle comprising the depressed center chassis of any one of claims 1-9.

Technical Field

The invention belongs to the technical field of railway wagons, and particularly relates to a concave underframe and a railway concave car.

Background

The railway flat car with the concave bottom is mainly used for transporting ultrahigh goods, and plays a role in lifting the weight of special goods on the railway.

At present, four-axle railway depressed center flat car with load over 40t generally designs the depressed center frame into a box-shaped totally-enclosed cavity structure for improving the rigidity of the depressed center frame because of large load, and the whole car adopts a braking system of a double-brake cylinder and a double-brake modulator, so that the number of accessories of the braking system is increased, the use reliability is reduced, and the manufacturing cost is increased. Meanwhile, the brake system adopting the double brake cylinders and the double brake adjusters is generally respectively arranged above the bogies at two ends, so that the car body and the bogies must be separated for maintenance and replacement of the brake fittings, which is not favorable for maintenance and replacement of the brake system and increases the maintenance cost.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a concave underframe and a railway concave underframe, and aims to solve the technical problems that in the prior art, the concave underframe is designed into a box-shaped fully-closed cavity structure, and a car body and a bogie need to be separated for maintenance and replacement of brake fittings caused by a brake system adopting a double-brake cylinder and a double-brake modulator, so that the maintenance and replacement of the brake system are not facilitated, and the maintenance cost is increased.

The technical scheme of the invention is as follows:

in one aspect, the present invention provides a well chassis comprising:

the bearing beam assembly is arranged between the two end arm assemblies, the end part of the bearing beam assembly is connected with the end arm assembly at the same end, and the end arm assembly and the bearing beam assembly form a non-closed cavity structure with an open bottom;

the air brake system, the air brake system sets up in the non-closed chamber structure of the bottom of concave chassis, the air brake system includes that the pull rod constitutes, the brake modulator, the brake cylinder and the lever is constituteed, wherein:

the number of the pull rod assemblies is two, the two pull rod assemblies are symmetrically arranged along the longitudinal central line of the concave underframe, the pull rod assemblies and the end arm assemblies are correspondingly arranged, and each pull rod assembly comprises an end pull rod, a vertical lever and a middle pull rod;

one end of each end pull rod is rotatably connected with the input end of the brake mechanism of the bogie at the same side, the other end of each end pull rod is rotatably connected with the middle part of the vertical lever, the upper part of the vertical lever is rotatably connected with the corresponding end arm, and the lower part of each end pull rod is rotatably connected with one end of the middle pull rod;

the brake cylinder is fixedly arranged on the bottom of the bearing beam assembly and is provided with an output end, and the output end of the brake cylinder can stretch and retract along the longitudinal direction;

the lever is constituteed including the connecting rod of two relative settings, two the middle part of connecting rod is through middle part pull rod rotatable coupling, two the one end of connecting rod respectively with the both ends rotatable coupling of brake cylinder, one the other end of connecting rod respectively with the homonymy the pull rod is constituteed the other end of middle pull rod and a connector rotatable coupling of one side of brake adjuster, another the other end of connecting rod with another connector rotatable coupling of one side of brake adjuster, the connector of the opposite side of brake adjuster and opposite side the pull rod is constituteed the other end rotatable coupling of middle pull rod.

Further, every end arm is constituteed and is all included end beam, draw beam, curb girder, end arm upper cover plate, checkered plate, wherein:

the two side beams are respectively arranged at the two transverse sides of the traction beam;

the middle part of the end beam is vertically arranged at one longitudinal end of the traction beam, two ends of the end beam are respectively arranged at one longitudinal end of the two side beams, the traction beam, the end beam and the two side beams form an end arm frame, and the end arm frame is provided with a horizontal supporting part and an oblique supporting part;

the checkered plate is arranged on the top surface of the horizontal supporting part of the end arm frame;

the end arm upper cover plate is arranged on the top surface of the oblique supporting part of the end arm frame, and the end arm upper cover plate and the checkered plate are fixedly connected into a whole.

Furthermore, a plurality of plug welding holes are formed in one end, facing the end arm upper cover plate, of the pattern plate at intervals, and the pattern plate is connected with the end arm upper cover plate in a welding mode through the plug welding holes.

Further, the carrier bar comprises a middle beam assembly, a cross beam assembly, a side beam assembly and an iron floor, wherein:

the middle beam assembly is arranged along the longitudinal direction, and the end part of the middle beam assembly is connected with the other longitudinal end of the traction beam at the same end;

the two side beam assemblies are arranged oppositely along the transverse direction, the two side beam assemblies are respectively arranged at the two transverse sides of the middle beam assembly, the side beam assemblies and the side beams are correspondingly arranged, and the end parts of the side beam assemblies are connected with the longitudinal other ends of the side beams at the same end;

the beam assemblies are arranged at intervals along the longitudinal direction, the middle part of each beam assembly is connected to the bottom of the middle beam assembly, two ends of each beam assembly are fixedly lapped on the two side beam assemblies, and the middle beam assembly, the two side beam assemblies and the beams form a bearing beam frame;

the iron floor is fixedly arranged on the top surface of the bearing beam frame, and the longitudinal two ends of the iron floor are respectively and fixedly connected with an end arm upper cover plate formed by the two end arms.

Still further, the end arm assembly further comprises an upper connecting plate and a lower connecting plate, wherein:

the upper connecting plate and the lower connecting plate are both arranged in parallel with the middle beam, and the upper connecting plate and the lower connecting plate are arranged on the same plumb plane;

the upper connecting plate is arranged at the upper part of the iron floor, and the end arm upper cover plate is connected with the iron floor through the upper connecting plate; the lower connecting plate is arranged at the lower part of the iron floor, and the middle beam assembly is connected with the iron floor through the lower connecting plate.

Furthermore, the carrier bar assembly further comprises a side rib plate and a side reinforcing plate, wherein:

the side reinforcing plates are arranged on the lower portions of the two transverse sides of the iron floor respectively, the side reinforcing plates are located on the transverse outer sides of the side beam assemblies on the same side, and each side reinforcing plate is connected with the side beam assemblies on the same side through a plurality of side rib plates arranged at intervals.

Furthermore, the upper part of the vertical lever formed by the pull rod is rotatably connected to the traction beam formed by the corresponding end arm.

Further, the brake cylinder is fixedly arranged on the back of an iron floor formed by the bearing beams.

Further, the air brake system further comprises an air storage cylinder and a control valve, the air storage cylinder and the control valve are fixedly arranged on the bottom of the bearing beam, the air storage cylinder is connected with the brake cylinder through a pipeline, and the control valve is arranged on the pipeline connected with the air storage cylinder and the brake cylinder.

On the other hand, the invention also provides a railway depressed center car which comprises the depressed center underframe.

The invention has the beneficial effects that:

the invention provides a railway concave bottom car which comprises a concave bottom frame, wherein the concave bottom frame comprises two end arm assemblies and two bearing beams, the two end arm assemblies are arranged oppositely along the longitudinal direction, the bearing beams are arranged between the two end arm assemblies, the end parts of the bearing beams are connected with the end arm assemblies at the same end, the end arm assemblies and the bearing beams are both of a non-closed cavity structure with an open bottom, and an air braking system is arranged in the non-closed cavity structure at the bottom of the concave bottom frame, so that the arrangement and the assembly of the air braking system are facilitated.

In addition, since the air brake system only has one brake cylinder and one brake adjuster, compared with the brake system of the double brake cylinder and the double brake adjuster in the background art, the parts are reduced, and the manufacturing cost is reduced by using the reliability evidence.

In addition, because the brake cylinder and the brake adjuster of the air brake system are uniformly arranged on the bottom formed by the bearing beam and are not arranged above the bogie, when the brake accessories are maintained and replaced, the vehicle body does not need to be separated from the bogie, so that the maintenance and replacement of the brake accessories are facilitated, the maintenance cost is reduced, and the brake adjusting device has good practical value.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural view of a railway depressed center car according to the present embodiment;

FIG. 2 is a schematic view of the recessed chassis of FIG. 1;

FIG. 3 is a schematic view of the upper structure of FIG. 2;

FIG. 4 is a schematic bottom view of FIG. 2;

FIG. 5 is a schematic sectional view A-A of FIG. 2;

FIG. 6 is a schematic cross-sectional view B-B of FIG. 2;

fig. 7 is a schematic layout of the air brake system of the present embodiment;

FIG. 8 is a schematic cross-sectional view C-C of FIG. 7;

fig. 9 is a schematic structural diagram of fig. 7.

In the drawings: 1-concave underframe, 2-air braking system, 3-bogie, 4-coupler buffer device and 5-hand braking device;

1.1-end arm component, 1.2-bearing beam component, 1.1.1-end beam, 1.1.2-traction beam, 1.1.3-side beam, 1.1.4-end arm upper cover plate, 1.1.5-pattern plate, 1.1.6-upper connecting plate and 1.1.7-lower connecting plate;

1.2.1-middle beam, 1.2.2-cross beam, 1.2.3-side beam, 1.2.4-side rib, 1.2.5-side reinforcing plate, 1.2.6-iron floor;

2.1-end pull rod, 2.2-vertical lever, 2.3-middle pull rod, 2.4-brake adjuster, 2.5-air pipeline, 2.6-brake cylinder, 2.7-air storage cylinder, 2.8-lever, 2.9-control valve and 2.10-middle pull rod.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

Fig. 1 is a schematic structural diagram of a railway well car according to this embodiment, and with reference to fig. 1, the railway well car according to this embodiment includes a well underframe 1, an air brake system 2, a bogie 3, a coupler buffer device 4 and a brake device 5, where the bogie 3, the coupler buffer device 4 and the brake device 5 are not technical problems that need to be solved in this embodiment in the well underframe 1, and the above all belong to common general knowledge of those skilled in the art, and therefore, this embodiment is not described in detail again.

Fig. 2 is a schematic structural diagram of the concave underframe in fig. 1, with reference to fig. 2, the concave underframe of this embodiment includes end arm component 1.1 and carrier bar component 1.2, end arm component 1.1 is provided with two along longitudinal direction relatively, carrier bar component 1.2 sets up between two end arm components 1.1, the tip that carrier bar component 1.2 constitutes 1.1 and is connected with the end arm component 1.1 of homonymy, carrier bar component 1.2 and the end arm component 1.1 of both sides can adopt the classic fixed connection mode of bending up and folding down to connect, end arm component 1.1 and carrier bar component 1.2 are the open-bottomed non-closed cavity structure, so can make things convenient for air brake system's arrangement.

Fig. 3 is a schematic view of the upper structure of fig. 2, fig. 4 is a schematic view of the lower structure of fig. 2, and in combination with fig. 2-4, in the present embodiment, each end arm assembly 1.1 comprises an end beam 1.1.1, a traction beam 1.1.2, a side beam 1.1.3, an end arm upper cover plate 1.1.4 and a checkered plate 1.1.5, the traction beam 1.1.2 is arranged along the longitudinal direction, the side beams 1.1.3 are oppositely arranged along the transverse direction, the two side beams 1.1.3 are respectively arranged at the two transverse sides of the traction beam 1.1.2, the middle part of the end beam 1.1.1 is vertically arranged at one longitudinal end of the traction beam 1.1.2, the two ends of the end beam 1.1.1 are respectively arranged at one longitudinal end of the two side beams, the traction beam 1.1.2, the end beam 1.1.1 and the two side beams 1.1.3 form an end arm frame, the end arm frame is provided with a horizontal supporting part and an oblique supporting part, the pattern plate 1.1.5 is arranged on the top surface of the horizontal supporting part of the end arm frame, the end arm upper cover plate 1.1.4 is arranged on the top surface of the oblique supporting part of the end arm frame, and the end arm upper cover plate 1.1.4 and the pattern plate 1.1..

Further, in the present embodiment, a plurality of plug welding holes are arranged at intervals at one end of the checkered plate 1.1.5 facing the end arm upper cover plate 1.1.4, and the checkered plate 1.1.5 is welded with the end arm upper cover plate 1.1.4 through the plurality of plug welding holes, which can effectively prevent the checkered plate 1.1.5 from deforming during vehicle operation.

In this embodiment, the parts forming the end arm assembly 1.1 can be assembled by welding.

Fig. 6 is a schematic sectional view of fig. 2 taken along a B-B section, and referring to fig. 2, fig. 3, fig. 4 and fig. 6, the carrier beam assembly 1.2 of the present embodiment includes a middle beam assembly 1.2.1, a cross beam assembly 1.2.2, two side beam assemblies 1.2.3 and an iron floor 1.2.6, wherein the middle beam assembly 1.2.1 is disposed along a longitudinal direction, an end portion of the middle beam assembly 1.2.1 is connected to another longitudinal end of the same end draft beam 1.1.2, the two side beam assemblies 1.2.3 are disposed along a transverse direction, the two side beam assemblies 1.2.3 are disposed on two transverse sides of the middle beam assembly 1.2.1, the side beam assembly 1.2.3 and the side beam 1.1.3 are disposed correspondingly, an end portion of the side beam assembly 1.2.3 is connected to another longitudinal end portion of the same end side beam 1.1.3, the cross beam assembly 1.2.2.2 is disposed at intervals along a longitudinal direction, a middle portion of each of the middle beam assembly 1.2 is connected to a bottom portion of the two cross beam assemblies 1.2.2, and each cross beam assembly is connected to a bottom portion of the cross beam assembly 1.2.2.2, the middle beam assembly 1.2.1, the two side beam assemblies 1.2.3 and the plurality of cross beam assemblies 1.2.2 enclose a bearing beam frame, the iron floor 1.2.6 is fixedly arranged on the top surface of the bearing beam frame, and the longitudinal two ends of the iron floor 1.2.6 are fixedly connected with the end arm upper cover plate 1.1.4 of the two end arm assemblies 1.1 respectively.

Fig. 5 is a schematic sectional view taken along line a-a of fig. 2, and referring to fig. 4 and fig. 5, in this embodiment, the end arm assembly 1.1 further includes an upper connecting plate 1.1.6 and a lower connecting plate 1.1.7, where the upper connecting plate 1.1.6 and the lower connecting plate 1.1.7 are both disposed in parallel with the middle beam assembly 1.2.1, and the upper connecting plate 1.1.6 and the lower connecting plate 1.1.7 are disposed on the same plumb plane, the upper connecting plate 1.1.6 is disposed on the upper portion of the iron floor 1.2.6, and the end arm upper cover plate 1.1.4 is connected to the iron floor 1.2.6 through the upper connecting plate 1.1.6, so as to strengthen the connection between the end arm upper cover plate 1.1.4 and the iron floor 1.2.6; the lower connecting plate 1.1.7 is arranged at the lower part of the iron floor 1.2.6, and the middle beam assembly 1.2.1 is connected with the iron floor 1.2.6 through the lower connecting plate 1.1.7, so that the middle beam assembly 1.2.1 is connected with the iron floor 1.2.6.

With reference to fig. 4 and fig. 6, the carrier bar assembly 1.2 of the present embodiment further includes two side stiffeners 1.2.4 and two side stiffeners 1.2.5, where the two side stiffeners 1.2.5 are disposed at lower portions of two lateral sides of the iron floor 1.2.6, the two side stiffeners 1.2.5 are disposed at lateral outer sides of the side beam assembly 1.2.3 on the same side, and each side stiffener 1.2.5 is connected to the side beam assembly 1.2.3 on the same side through a plurality of side stiffeners 1.2.4 disposed at intervals for reinforcing rigidity of the edge of the iron floor 1.2.6.

In this embodiment, the parts forming the load beam assembly 1.2 can be assembled by welding.

The air brake system 2 of the embodiment is arranged in a non-closed cavity structure at the bottom of the concave underframe, fig. 7 is a schematic layout diagram of the air brake system of the embodiment, fig. 8 is a schematic sectional view of C-C of fig. 7, and fig. 9 is a schematic structural diagram of fig. 7. With reference to fig. 7 to 9, the air brake system 2 of the present embodiment includes two tie rod assemblies, a brake adjuster 2.4, a brake cylinder 2.6 and a lever assembly 2.8, wherein the two tie rod assemblies are symmetrically arranged along a longitudinal center line of the concave underframe, the tie rod assemblies and the end arm assemblies 1.1 are correspondingly arranged, each tie rod assembly includes an end tie rod 2.1, an upright tie rod 2.2 and a middle tie rod 2.3, one end of the end tie rod 2.1 of each tie rod assembly is rotatably connected to an input end of the brake mechanism of the bogie 3 on the same side, the other end of the end tie rod 2.1 is rotatably connected to a middle portion of the upright tie rod 2.2, an upper portion of the upright tie rod 2.2 is rotatably connected to the corresponding end arm assembly 1.1, a lower portion of the end tie rod 2.1 is rotatably connected to one end of the middle tie rod 2.3, the brake cylinder 2.6 is fixedly arranged on a bottom portion of the bearing beam assembly 1.2, the brake cylinder 2.6 has an output end, the outlet end of the brake cylinder 2.6 is longitudinally telescopic.

The lever of this embodiment is constituteed including two connecting rods 2.8 that set up relatively, middle part pull rod 2.10 rotatable coupling is passed through at the middle part of two connecting rods 2.8, two connecting rod 2.8's one end respectively with the both ends rotatable coupling of brake cylinder 2.6, the other end of a connecting rod 2.8 respectively with the other end of the middle pull rod 2.3 that the pull rod of homonymy is constituteed and a connector rotatable coupling of one side of brake modulator 2.4, another connector rotatable coupling of the other end of another connecting rod 2.8 and one side of brake modulator 2.4, the other end rotatable coupling of the middle pull rod 2.3 that the connector of the opposite side of brake modulator 2.4 and the pull rod of the opposite side are constituteed.

When the bogie needs to be braked, air inlet of the brake cylinder 2.6 is controlled, so that a piston rod of the brake cylinder 2.6 extends out to drive the two connecting rods formed by the levers to rotate, and further drive the end pull rod 2.1 formed by the pull rods to drive the input end of the basic brake device of the bogie 3 on the same side to rotate, so that the purpose of braking the bogie by starting the output end of the basic brake device is achieved.

Compared with the brake system with the double brake cylinders and the double brake regulators in the background art, the air brake system of the embodiment has the advantages of reduced fittings, use reliability evidence and reduced manufacturing cost.

In addition, because the brake cylinder and the brake adjuster of the air brake system of the embodiment are uniformly arranged on the bottom formed by the bearing beam and are not arranged above the bogie, when the brake accessories are maintained and replaced, the vehicle body and the bogie do not need to be separated, so that the maintenance and replacement of the brake accessories are facilitated, the maintenance cost is reduced, and the air brake system has good practical value.

With reference to fig. 9, in the present exemplary embodiment, the upper part of the upright lever 2.2 of the tie rod assembly is pivotably connected to the trailing beam 1.12 of the corresponding end arm assembly 1.1, while the brake cylinder 2.6 is arranged on the rear side of the iron floor 1.2.6 of the support beam assembly 1.2.

In particular, in this embodiment, the iron floor 1.2.6 may be provided with a mounting block for connecting with the brake cylinder 2.6 and the lever assembly 2.8.

Further, the air brake system 2 of the embodiment further includes an air reservoir 2.7 and a control valve 2.9, the air reservoir 2.7 and the control valve 2.9 are both fixedly arranged on the bottom of the carrier bar assembly 1.2, the air reservoir 2.7 is connected with the brake cylinder 2.6 through a pipeline, the control valve 2.9 is arranged on a pipeline connecting the air reservoir 2.7 and the brake cylinder 2.6, the air reservoir 2.7 is connected with an external air source through a pipeline assembly, and the external air source is operatively introduced into the brake cylinder 2.6 through controlling the control valve 2.9, so as to realize braking of the bogie.

In this embodiment, the air reservoir 2.7 and the control valve 2.9 may be disposed on the back of the iron floor 1.2.6 of the carrier bar assembly 1.2, and the mounting blocks corresponding to the air reservoir 2.7 and the control valve 2.9 may be disposed on the back of the iron floor 1.2.6 of the carrier bar assembly 1.2, so that the air reservoir 2.7 and the control valve 2.9 may be assembled on the carrier bar assembly 1.2.

In conclusion, the railway depressed center car with the concave underframe has the characteristics of simple and economic structure and simplicity and convenience in production and manufacture, and is convenient for arrangement, installation, debugging and maintenance of a single brake cylinder and a single brake adjuster brake system, so that the braking is safer and more reliable, and the practicability is strong.

The following embodiments are provided for the purpose of illustrating the present invention and are not to be construed as limiting the present invention in any way, and it will be apparent to those skilled in the art that the technical features of the present invention can be modified or changed in some ways without departing from the scope of the present invention.