CN111572570A

CN111572570A - Middle-beam-free low-floor underframe for railway transportation of highway automobiles

Info

Publication number: CN111572570A
Application number: CN202010441451.4A
Authority: CN
Inventors: 吴杰; 李兴; 张文龙; 李铮; 马一丹
Original assignee: CRRC Shandong Co Ltd
Current assignee: CRRC Shandong Co Ltd; CRRC Wind Power Shandong Co Ltd
Priority date: 2020-05-22
Filing date: 2020-05-22
Publication date: 2020-08-25
Anticipated expiration: 2040-05-22
Also published as: CN111572570B

Abstract

The invention discloses a middle-beam-free low floor underframe for a railway transportation road automobile, which comprises an end beam assembly, a traction and bolster assembly, a middle beam assembly, a side beam assembly, a small cross beam, a reinforcing plate, an upper traction support seat assembly, a lower traction support seat assembly, a limit stop seat and a limit baffle. The rigidity of the vehicle is ensured by reinforcing the side beam composition structure, the cross section of the underframe is small, the floor surface of the underframe is low by adopting a center-beam-free low-floor structure, and the problem that the road truck cannot be loaded and transported due to the high floor surface of the traditional vehicle is solved; because this chassis floor face is low, the maintenance operation of bogie of not being convenient for, consequently be equipped with a plurality of windows of looking out in this back frame traction and bolster integrated configuration, can realize the convenient maintenance of bogie through the activity window.

Description

Middle-beam-free low-floor underframe for railway transportation of highway automobiles

Technical Field

The invention relates to a special underframe for a railway transportation road automobile, belonging to the technical field of railway special equipment.

Background

In recent years, shortage of materials in plateau areas has been restricting economic development in areas such as Tibet. At present, the transportation of materials mainly comprises automobiles and airplanes, wherein the transportation of the airplanes is limited by the factors of small number of airports and high transportation cost, and is only used for the transportation of important emergency materials; the supply of other normal materials is completed by the automobile transportation on the road. Due to the fact that the plateau area of China is in a high-altitude mountain area, the climate environment is severe, geological disasters are frequent, and the defects of low efficiency, high risk and poor safety of automobile transportation on the highway of the line are caused. After the railways in plateau areas are built, the railways are adopted to finish material transportation, so that the influence of the environment, the terrain and the climate can be effectively avoided, the transportation efficiency is improved, the risk is reduced, and the safety is improved. At present, the floor of railway transport vehicles is high, and road automobiles cannot be loaded and transported. If adopt the direct transportation goods and materials of railway, need to use the car with the goods and materials flip-chip for rail vehicle, need unload the goods and materials again, still need again with the goods and materials flip-chip for the car transportation to appointed place after arriving the plateau district, the operation is inconvenient, inefficiency.

Disclosure of Invention

The invention aims to solve the technical problem of providing the underframe of the special vehicle, which is convenient to use, high in loading and unloading efficiency, quick in transportation turnover and capable of meeting the requirement of loading and transporting highway automobiles, aiming at the defects in the prior art.

In order to solve the technical problem, the invention provides a middle-beam-free low floor underframe for railway transportation highway automobiles, which comprises an end beam assembly, a traction and bolster assembly, a middle beam assembly, a side beam assembly and a small cross beam, the stiffening plate, on pull the supporting seat and constitute, pull the supporting seat down and constitute, spacing fender seat and limit baffle, middle part roof beam is constituteed both sides and is equipped with symmetrical structure's curb girder and constitutes, be equipped with a plurality of little crossbeams between middle part roof beam is constituteed and the curb girder is constituteed, both sides roof beam is constituteed both ends and is equipped with the end beam of connecting two curb girders and constitutes, be equipped with between middle part roof beam is constituteed and is drawn the pillow and constitute with pulling the supporting seat down, on pull the supporting seat and constitute to arrange to constitute both ends at the curb girder and be used for connecting movable draw gear with pulling down the supporting seat and constitute and be used for restricting movable draw gear home range on pulling the supporting seat and.

The end beam assembly is of a steel plate assembly welding structure and comprises an end cross beam assembly I, an end cross beam assembly II, a cab apron assembly I, a side buffering seat assembly and a cab apron assembly II, wherein the cab apron assembly I is arranged on the outer side of the end cross beam assembly I, the cab apron assembly II is arranged on the outer side of the end cross beam assembly II, and the side buffering seat assembly is arranged below the cab apron assembly II on the outer side of the end cross beam assembly II; the first transition plate component and the second transition plate component, the first end cross beam component and the second end cross beam component are symmetrical structural components respectively.

The traction bolster assembly is of a steel plate assembly welding structure and comprises an end cab beam assembly I, an end cab beam assembly II, a traction beam assembly, a traction upper cover plate, a lookout beam assembly, a cross beam assembly, a sleeper beam assembly, a middle cab beam assembly I, a middle cab beam assembly II, a middle cab beam assembly III and a transiting beam assembly, wherein the traction beam assembly is arranged on a longitudinal central line of the traction bolster assembly, the sleeper beam assembly is arranged on the left side and the right side of an upper center plate formed by the traction beams, the cross beam assembly is arranged on the two sides of the sleeper beam assembly and welded with the traction beam assembly together in groups, and the lookout beam assembly is arranged between the cross beam assembly and the sleeper beam assembly; the end cab apron component I and the end cab apron component II are symmetrically arranged on two sides of a towing beam component close to the end beam component, the towing upper cover plate is arranged on the lookout beam component, the cross beam component and the sleeper beam component, the transition beam component is arranged on the end part of the towing beam component close to the middle beam component, the middle cab apron component I and the middle cab apron component II are arranged on two sides of the towing beam component close to the end of the transition beam component and are connected with the lookout beam component, and the middle cab apron component III is arranged on two sides of the towing beam component between the middle cab apron component I, the middle cab apron component II and the transition beam component.

The first end transition beam assembly and the second end transition beam assembly are formed by assembling and welding channel steel and profiled steel plates.

The device comprises a traction beam assembly, a central disc mounting seat plate, a spherical upper central disc, a central disc mounting seat plate, a front end and a rear end of the central disc, wherein the traction beam assembly is provided with a longitudinal beam, the longitudinal beam is a welded box-type structural beam with a single-side double web plate, the central disc mounting seat plate is arranged between the two box-type longitudinal beams, the central disc mounting seat plate is fixedly connected with the spherical upper central disc through bolts, and the front end and the rear end of the central; the sleeper beam is assembled on the left side and the right side of an upper center plate consisting of the traction beams and welded on the longitudinal beams; the cross beam is assembled on two sides of the sleeper beam and welded with the traction beam in an assembling way; the observation beam group is welded between the beam group and the sleeper beam group; the transition beam is a box-type structural beam, is arranged at the end of the traction beam close to the middle beam and is welded with the longitudinal beam; the windows between the cross beam assemblies and the sleeper beam assemblies are lookout windows, so that the bogie mounted on the lower portion can be maintained conveniently.

The middle beam assembly adopts a section steel assembly welding structure and comprises a middle longitudinal beam I, a middle longitudinal beam II, a middle cross beam I, a middle longitudinal beam III and a middle cross beam II; the first middle cross beam is of a full-length I-shaped steel structure and is uniformly arranged in the longitudinal direction, the second middle longitudinal beam is arranged between the first middle cross beams, and the first middle longitudinal beam is arranged on the outer side of the first middle cross beam. The middle beam is of a structure without a middle beam, does not transfer longitudinal force of the underframe, has the section height of 100-140mm, and ensures the characteristic of the underframe low floor.

The side beam assembly is a combined welding type half-box structure and comprises a first reinforcing plate, a first side column-pulling beam assembly, a side sleeper beam assembly, a first side beam reinforcing plate, a side beam, a side middle column beam assembly, a side beam plate assembly, a second side beam reinforcing plate, a side beam end sealing plate, a side beam inner longitudinal reinforcing beam assembly, a side beam inner longitudinal beam assembly and a second reinforcing plate, wherein the side beam is arranged at the upper part of the outer side of the side beam plate assembly; the cross section of each side beam plate is in an oblique L shape, each side beam inner longitudinal reinforcing beam is formed by splicing a plurality of side beam inner longitudinal reinforcing plates, and the cross section of each side beam inner longitudinal reinforcing plate is in an oblique L shape; the side beam inner longitudinal beam assembly is formed by assembling and welding a plurality of side beam inner longitudinal beams and side beam inner longitudinal beam end sealing plates, and the cross section of each side beam inner longitudinal beam is in an inverted-inclined L shape; the column beam assembly is formed by assembling and welding a column beam and a column beam lower cover plate, and the column beam is of a U-shaped structure; the side beam is made of square steel; the side beam end sealing plates are cut L-shaped steel plates; the side beams are made of square steel.

The upper traction support seat assembly and the lower traction support seat assembly are both interface parts for installing the traction device and comprise traction support seats and bushings, and the bushings are pressed in pin holes of the traction support seats.

Has the advantages that: the rigidity of the vehicle is ensured by reinforcing the side beam composition structure, the structure is of a low-floor structure without a middle beam, the section height of the underframe is small, the floor surface of the underframe is low, the shipment of the road truck meeting the standard requirement of GB/T1589-; because this chassis floor face is low, the maintenance operation of bogie of not being convenient for, consequently be equipped with a plurality of windows of looking out in this back frame traction and bolster integrated configuration, can realize the convenient maintenance of bogie through the activity window.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of FIG. 1 taken along line A of the present invention;

FIG. 3 is a cross-sectional view of FIG. 1B-B of the present invention;

FIG. 4 is a schematic structural view of the side sill assembly of the present invention;

FIG. 5 is a top plan view of a structural schematic of the side sill assembly of the present invention;

FIG. 6 is a cross-sectional view of the present invention shown in FIGS. 4C-C;

FIG. 7 is a cross-sectional view of FIG. 4D-D illustrating the present invention;

FIG. 8 is a schematic structural view of the center sill assembly of the present invention;

FIG. 9 is a schematic view of FIG. 8 taken in direction E in accordance with the present invention;

FIG. 10 is a schematic structural view of the end beam assembly of the present invention;

FIG. 11 is a schematic top view of the structure of the end beam assembly of the present invention;

FIG. 12 is a schematic view of the structure of the traction and bolster assembly of the present invention;

FIG. 13 is a schematic view of the present invention shown rotated in direction F from FIG. 12;

FIG. 14 is a schematic view taken along line H of FIG. 12 in accordance with the present invention;

FIG. 15 is a schematic view of the structure of the traction support seat of the present invention;

FIG. 16 is a schematic top view of the structure of the traction support base assembly of the present invention;

in the figure: 1 end beam component, 2 traction and bolster component, 3 middle beam component, 4 side beam component, 5 small cross beam, 6 reinforcing plate, 7 upper traction support seat component, 8 lower traction support seat component, 9 limit stop seat, 10 limit baffle, 11 reinforcing plate I, 12 side traction column beam component, 13 side pillow column beam component, 14 side beam reinforcing plate I, 15 side beam, 16 side middle column beam component, 17 side beam plate component, 18 side beam reinforcing plate II, 19 side beam end sealing plate, 20 side beam inner longitudinal reinforcement beam component, 21 side beam inner longitudinal beam component, 22 reinforcing plate II, 23 middle longitudinal beam I, 24 middle longitudinal beam II, 25 middle cross beam I, 26 middle longitudinal beam III, 27 middle cross beam II, 28 end cross beam component I, 29 end cross beam component II, 30 side transition plate component I, 31 side buffer seat component II, 32 transition plate component II, 33 end transition beam component I, 34 end transition beam component II, 35 traction beam component, 36 upper traction cover plate, 37 lookout beam components, 38 cross beam components, 39 sleeper beam components, 40 middle transition beam components I, 41 middle transition beam components II, 42 middle transition beam components III, 43 transition beam components, 44 traction support seats, 45 bushes and 351 longitudinal beams.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and examples.

Fig. 1 is a schematic structural diagram of the present invention.

FIG. 2 is a schematic view of the invention taken along line A of FIG. 1.

FIG. 3 is a schematic cross-sectional view of the present invention shown in FIGS. 1B-B.

The invention provides a middle-beam-free low floor underframe for railway transportation highway automobiles, which comprises an end beam assembly 1, a traction and bolster assembly 2, a middle beam assembly 3, a side beam assembly 4, a small cross beam 5, a reinforcing plate 6, an upper traction support seat assembly 7, a lower traction support seat assembly 8, a limit stop seat 9 and a limit baffle 10, wherein the two sides of the middle beam assembly 3 are provided with the side beam assembly 4 with symmetrical structures, a plurality of small cross beams 5 are arranged between the middle beam assembly 3 and the side beam assembly 4 for enhancing the structural strength, the two ends of the two side beam assembly 4 are provided with the end beam assembly 1 for connecting the two side beams, the traction and bolster assembly 2 is arranged between the middle beam assembly 3 and the end beam assembly 1, the upper traction support seat assembly 7 and the lower traction support seat assembly 8 are arranged at the two ends of the side beam assembly 4 for connecting a movable traction device, and the limit stop seat 9 and the limit baffle 10 are arranged between the upper traction support seat assembly 7 and the lower traction support seat assembly 8 at the two The range of motion.

Fig. 10 is a schematic structural view of the end beam assembly of the present invention.

Fig. 11 is a schematic top view of the structure of the end beam assembly of the present invention.

The end beam assembly 1 is of a steel plate assembly welding structure and comprises an end beam assembly I28, an end beam assembly II 29, a cab apron assembly I30, a side buffering seat assembly 31 and a cab apron assembly II 32, wherein the cab apron assembly I30 is installed on the outer side of the end beam assembly I28, the cab apron assembly II 32 is installed on the outer side of the end beam assembly II 29, and the side buffering seat assembly 31 is installed below the cab apron assembly II 32 on the outer side of the end beam assembly II 29; the first ferry plate assembly 30, the second ferry plate assembly 32, the first end beam assembly 28 and the second end beam assembly 29 are symmetrical structural members respectively.

Fig. 12 is a schematic structural view of the traction and bolster assembly of the present invention.

FIG. 13 is a schematic view of the present invention shown rotated in direction F from FIG. 12.

FIG. 14 is a schematic view of the invention taken in the direction H of FIG. 12.

The traction bolster assembly 2 is of a steel plate assembly welding structure and comprises an end cab beam assembly I33, an end cab beam assembly II 34, a traction beam assembly 35, a traction upper cover plate 36, a lookout beam assembly 37, a cross beam assembly 38, a sleeper beam assembly 39, a middle cab beam assembly I40, a middle cab beam assembly II 41, a middle cab beam assembly III 42 and a transition beam assembly 43, wherein the traction beam assembly 35 is arranged on the longitudinal central line of the traction bolster assembly 2, the sleeper beam assembly 39 is arranged on the left side and the right side of an upper center plate of the traction beam assembly 35, the cross beam assembly 38 is arranged on two sides of the sleeper beam assembly 39 and is assembled and welded with the traction beam assembly 35, and the lookout beam assembly 37 is arranged between the cross beam assembly 38 and the sleeper beam assembly 39; the end aqueduct assembly I33 and the end aqueduct assembly II 34 are symmetrically arranged at two sides of a traction beam assembly 35 close to the end beam assembly 1, the traction upper cover plate 36 is arranged above a lookout beam assembly 37, a cross beam assembly 38 and a sleeper beam assembly 39, the transition beam assembly 43 is arranged at the end part of the traction beam assembly 35 close to the middle beam assembly 3, the middle aqueduct assembly I40 and the middle aqueduct assembly II 41 are arranged at two sides of the traction beam assembly 35 close to the end of the transition beam assembly 43 and connected with the lookout beam assembly 37, and the middle aqueduct assembly III 42 is arranged at two sides of the traction beam assembly 35 between the middle aqueduct assembly I40 and the middle aqueduct assembly II 41 and the transition beam assembly 43.

The first end transition beam assembly 33 and the second end transition beam assembly 34 are formed by assembling and welding channel steel and profiled steel sheets.

The traction beam assembly 35 is provided with a longitudinal beam 351, the longitudinal beam 351 is a welded box-type structural beam with a single-side double web plate, a center plate mounting seat plate is arranged between the two box-type longitudinal beams, the center plate mounting seat plate is fixedly connected with a center plate on a spherical surface through bolts, and mounting seats for mounting lookout windows are respectively arranged at the front and the rear of the center plate mounting seat; the sleeper beam assembly 39 is a box-shaped structure formed by assembling and welding an upper sleeper beam cover plate, a lower sleeper beam cover plate and a sleeper beam web plate, is assembled at the left side and the right side of an upper center plate of the traction beam assembly 35 and is welded on the longitudinal beam 351; the beam assembly 38 is a box-shaped structure formed by assembling and welding a beam upper cover plate, a beam lower cover plate and a beam web plate, and is assembled on two sides of the sleeper beam and assembled and welded with the traction beam; the observation beam assembly 37 is welded between the beam assembly 38 and the sleeper beam assembly 39; the transition beam assembly 43 is a box-shaped structural beam, is arranged at the end 3, close to the middle beam assembly, of the traction beam assembly 35, and is welded with the longitudinal beam 351 together; the windows formed between the beam assemblies and the sleeper beam assemblies are lookout windows, so that the bogie mounted on the lower portion can be maintained conveniently.

Fig. 8 is a schematic structural view showing the composition of the center sill of the present invention.

FIG. 9 is a schematic view of the invention taken along line E of FIG. 8.

The middle beam assembly 3 adopts a section steel assembly welding structure and comprises a first middle longitudinal beam 23, a second middle longitudinal beam 24, a first middle cross beam 25, a third middle longitudinal beam 26 and a second middle cross beam 27; the middle cross beams 25 are of I-shaped steel structures with full length and are evenly arranged in the longitudinal direction, the middle longitudinal beams 24 are arranged between the middle cross beams 25, and the middle longitudinal beams 23 are arranged on the outer sides of the middle cross beams 25. The middle beam component 3 is of a structure without a middle beam, does not transmit the longitudinal force of the underframe, and has the section height of 100-140mm, thereby ensuring the characteristic of the underframe low floor.

Fig. 4 is a schematic structural view showing the side member assembly of the present invention.

Fig. 5 is a schematic plan view showing the structure of the side member assembly of the present invention.

FIG. 6 is a schematic cross-sectional view of the present invention shown in FIGS. 4C-C.

FIG. 7 is a cross-sectional view of the present invention shown in FIG. 4D-D.

The side beam assembly 4 is a group welding type half-box structure and comprises a first reinforcing plate 11, a side column-pulling beam assembly 12, a side column-pillow beam assembly 13, a first side beam reinforcing plate 14, a side beam 15, a side middle column beam assembly 16, a side beam assembly 17, a second side beam reinforcing plate 18, a side beam end sealing plate 19, a side beam inner longitudinal reinforcing beam assembly 20, a side beam inner longitudinal beam assembly 21 and a reinforcing plate 22, wherein the side beam 15 is arranged at the upper part of the outer side of the side beam assembly 17, the side column-pulling beam assembly 12, the side column-pillow beam assembly 13 and the side middle column beam assembly 16 are arranged at the outer side of the side beam assembly 17 and connected with the side beam 15, the side beam inner longitudinal beam assembly 21 is arranged at the inner side of the side beam assembly 17, the side beam inner longitudinal reinforcing beam assembly 20 is arranged on the upper part of the side beam inner longitudinal beam assembly 21 and connected with the side beam assembly 17, the side beam end sealing plate 19 is arranged at the two ends of the side beam assembly 17, the second reinforcing plate 22 is connected with the side beam end sealing plate 19 and the side beam 15; the cross section of the side beam plate assembly 17 is in an oblique L shape, the side beam inner longitudinal reinforcing beam assembly 20 is formed by splicing a plurality of side beam inner longitudinal reinforcing plates, and the cross section of each side beam inner longitudinal reinforcing plate is in an oblique L shape; the side beam inner longitudinal beam assembly 21 is formed by assembling and welding a plurality of side beam inner longitudinal beams and side beam inner longitudinal beam end sealing plates, and the cross sections of the side beam inner longitudinal beams are in an inverted-inclined L shape; the column beam assembly is formed by assembling and welding a column beam and a column beam lower cover plate, and the column beam is of a U-shaped structure; the side beam is made of square steel; the side beam end sealing plates are cut L-shaped steel plates; the side members 15 are made of square steel.

Fig. 15 is a schematic structural view of the traction support seat of the present invention.

Fig. 16 is a schematic top view of the structure of the traction support seat assembly of the present invention.

The upper traction support seat assembly 7 and the lower traction support seat assembly 8 are both interface parts for installing a traction device and comprise a traction support seat 44 and a bushing 45, and the bushing 45 is pressed in a pin hole of the traction support seat 44.

The center-girder-free low-floor chassis adopts a center-girder-free structure and a high-side beam structure, has the characteristics of small section height of the chassis and low floor surface of the chassis, can meet the requirement of shipping highway trucks meeting the standard requirement of GB/T1589-; simultaneously, a plurality of lookout windows are arranged in the bottom frame traction and bolster composition structure, the operation problem that the bogie is inconvenient to overhaul due to the fact that the floor surface of the bottom frame is low is solved, and the device is simple in structure, novel and high in practicability.

The above-described embodiments of the invention are intended to be illustrative only and are not intended to be limiting, as all changes that come within the scope of or equivalence to the invention are intended to be embraced therein.

Claims

1. A no center sill low floor chassis for railway transportation highway car which characterized in that: including end beam component (1), it constitutes (2) to lead the pillow, middle part roof beam component (3), curb girder component (4), little crossbeam (5), reinforcing plate (6), go up to draw supporting seat component (7), draw supporting seat component (8) down, spacing fender seat (9) and limit baffle (10), middle part roof beam component (3) both sides are equipped with symmetrical structure's curb girder component (4), be equipped with a plurality of little crossbeams (5) between middle part roof beam component (3) and curb girder component (4), both ends of two curb girder component (4) are equipped with the end beam component (1) of connecting two curb girders and constituteing, be equipped with between middle part roof beam component (3) and end beam component (1) and lead the pillow and constitute (2), go up to draw supporting seat component (7) and lower traction supporting seat component (8) and arrange and be used for connecting movable draw device at curb girder component (4) both ends, spacing fender seat (9) and limit baffle (10) arrange and draw supporting seat component (7) and lower traction support The support seat assemblies (8) are used for limiting the range of motion of the movable traction device.

2. The center sill-free low floor underframe for a railway transportation road automobile of claim 1, wherein: the end beam assembly (1) is of a steel plate assembly welding structure and comprises an end beam assembly I (28), an end beam assembly II (29), a transition plate assembly I (30), a side buffering seat assembly (31) and a transition plate assembly II (32), wherein the transition plate assembly I (30) is installed on the outer side of the end beam assembly I (28), the transition plate assembly II (32) is installed on the outer side of the end beam assembly II (29), and the side buffering seat assembly (31) is installed below the transition plate assembly II (32) on the outer side of the end beam assembly II (29); the first transition plate assembly (30), the second transition plate assembly (32), the first end beam assembly (28) and the second end beam assembly (29) are symmetrical structural members respectively.

3. The center sill-free low floor underframe for a railway transportation road automobile of claim 1, wherein: the traction bolster assembly (2) is of a steel plate assembly welding structure and comprises a first end transition beam assembly (33), a second end transition beam assembly (34), a traction beam assembly (35), a traction upper cover plate (36), a lookout beam assembly (37), a cross beam assembly (38), a sleeper beam assembly (39), a first middle transition beam assembly (40), a second middle transition beam assembly (41), a third middle transition beam assembly (42) and a transition beam assembly (43), wherein the traction beam assembly (35) is arranged on a longitudinal central line of the traction bolster assembly (2), the sleeper beam assembly (39) is arranged on the left side and the right side of an upper center plate of the traction beam assembly (35), the cross beam assembly (38) is arranged on the two sides of the sleeper beam assembly (39) and is assembled and welded with the traction beam assembly (35), and the lookout beam assembly (37) is arranged between the cross beam assembly (38) and the sleeper beam assembly (39); the end transition beam assembly I (33) and the end transition beam assembly II (34) are symmetrically arranged on two sides of a traction beam assembly (35) close to the end beam assembly (1), the traction upper cover plate (36) is arranged on the observation beam assembly (37), the cross beam assembly (38) and the sleeper beam assembly (39), the transition beam assembly (43) is arranged at the end part of the traction beam assembly (35) close to the middle beam assembly (3), the middle transition beam assembly I (40) and the middle transition beam assembly II (41) are arranged on two sides of the traction beam assembly (35) close to the end of the transition beam assembly (43) and connected with the observation beam assembly (37), and the middle transition beam assembly III (42) is arranged on two sides of the traction beam assembly (35) between the middle transition beam assembly I (40), the middle transition beam assembly II (41) and the transition beam assembly (43).

4. The center sill-free low floor underframe for a railway transportation road automobile of claim 3, wherein: the first end transition beam assembly (33) and the second end transition beam assembly (34) are formed by assembling and welding channel steel and profiled steel sheets.

5. The center sill-free low floor underframe for a railway transportation road automobile of claim 3, wherein: the special observation window is characterized in that the traction beam assembly (35) is provided with a longitudinal beam (351), the longitudinal beam (351) is a welded box-type structural beam with a single-side double web plate, a center plate mounting seat plate is arranged between the two box-type longitudinal beams, the center plate mounting seat plate is fixedly connected with a spherical center plate through bolts, and the front end and the rear end of the center plate of the traction beam assembly (35) are respectively provided with an interface mounting seat for mounting an observation window; the sleeper beam assembly (39) is a box-shaped structure formed by assembling and welding an upper sleeper beam cover plate, a lower sleeper beam cover plate and a sleeper beam web plate, is assembled at the left side and the right side of an upper center plate of the traction beam assembly (35), and is welded on the longitudinal beam (351); the beam assembly (38) is a box-shaped structure formed by assembling and welding a beam upper cover plate, a beam lower cover plate and a beam web plate, and is assembled on two sides of the sleeper beam and assembled and welded with the traction beam; the observation beam assembly (37) is welded between the beam assembly (38) and the sleeper beam assembly (39); the transition beam assembly (43) is a box-shaped structural beam, is arranged at the end, close to the middle beam assembly (3), of the traction beam assembly (35), and is welded with the longitudinal beam (351).

6. The center sill-free low floor underframe for a railway transportation road automobile of claim 1, wherein: the middle beam assembly (3) adopts a section steel assembly welding structure and comprises a first middle longitudinal beam (23), a second middle longitudinal beam (24), a first middle cross beam (25), a third middle longitudinal beam (26) and a second middle cross beam (27); the middle cross beams (25) are of I-shaped steel structures with full length and are uniformly arranged in the longitudinal direction, the middle longitudinal beams (24) are arranged between the middle cross beams (25), and the middle longitudinal beams (23) are arranged on the outer sides of the middle cross beams (25); the middle beam component (3) is of a structure without a middle beam, and the section height of the middle beam component is 100-140 mm.

7. The center sill-free low floor underframe for a railway transportation road automobile of claim 1, wherein: the side beam assembly (4) is of a group welding type half box type structure and comprises a first reinforcing plate (11), a side column-pulling beam assembly (12), a side sleeper beam assembly (13), a first side beam reinforcing plate (14), a side beam (15), a side middle column beam assembly (16), a side beam assembly (17), a second side beam reinforcing plate (18), a side beam end sealing plate (19), a side beam inner longitudinal reinforcing beam assembly (20), a side beam inner longitudinal beam assembly (21) and a reinforcing plate (22), wherein the side beam (15) is arranged on the upper portion of the outer side of the side beam plate assembly (17), the side column-pulling beam assembly (12), the side sleeper beam assembly (13) and the side middle column beam assembly (16) are arranged on the outer side of the side beam plate assembly (17) and connected with the side beam (15), the side beam inner longitudinal beam assembly (21) is arranged on the inner middle inner side of the side beam plate assembly (17), and the side beam inner longitudinal beam assembly (20) is arranged on the side beam inner longitudinal beam assembly, The side beam end sealing plates (19) are arranged at two ends of the side beam plate assembly (17) and the side beam (15), the first reinforcing plate (11) is connected with the side beam end sealing plates (19) and the side beam plate assembly (17), and the second reinforcing plate (22) is connected with the side beam end sealing plates (19) and the side beam (15); the cross section of the side beam plate assembly (17) is oblique L-shaped, the side beam inner longitudinal reinforcing beam assembly (20) is formed by splicing a plurality of side beam inner longitudinal reinforcing plates, and the cross section of each side beam inner longitudinal reinforcing plate is oblique L-shaped; the side beam inner longitudinal beam assembly (21) is formed by assembling and welding a plurality of side beam inner longitudinal beams and side beam inner longitudinal beam end sealing plates, and the cross sections of the side beam inner longitudinal beams are in an inverted-inclined L shape; the column beam assembly is formed by assembling and welding a column beam and a column beam lower cover plate, and the column beam is of a U-shaped structure; the side beam is made of square steel; the side beam end sealing plates are cut L-shaped steel plates; the side beams (15) are made of square steel.

8. The center sill-free low floor underframe for a railway transportation road automobile according to any one of claims 1-7, wherein: the upper traction support seat assembly (7) and the lower traction support seat assembly (8) are both interface parts for installing a traction device and comprise a traction support seat (44) and a bushing (45), and the bushing (45) is pressed in a pin hole of the traction support seat (44).