Narrow gauge bogie and ultra-low flatbed transport vehicle

Abstract

The utility model discloses a narrow gauge bogie and an ultra-low flatbed transport vehicle, and belongs to the technical field of flatbed vehicles. The ultra-low flatbed transport vehicle comprises a flatbed vehicle and two bogies which are arranged in the front-back direction. The flat car comprises a car body, and a middle beam, two side beams and two end plates on the lower side of the car body; the bogie comprises two side frames, a swing bolster, two wheel pairs, a center plate structure, two lower side bearings and two groups of springs; the middle part of the swing bolster is bent downwards to form a lower concave part; the two lower side bearings are arranged at the left end and the right end of the swing bolster correspondingly and located on the outer sides of the side frames on the corresponding sides correspondingly. The rail wheels of the wheel pairs are positioned on the outer sides of the side frames on the corresponding sides and on the inner sides of the edge beams on the corresponding sides of the flat plate transport vehicle; the front portion and the rear portion of the lower side of the middle beam are both concave upwards to form upper concave portions, and the two bogies are arranged on the two upper concave portions respectively. The middle beam is located between the two side frames and located above the plane where the top of the swing bolster is located. And the center plate structure is arranged between the lower concave part and the upper concave part. The height of the flat plate transport vehicle can be adjusted to about 400 mm.

Description

Technical Field

[0001] The utility model belongs to the technical field of flatbed vehicles, in particular to a narrow-gauge bogie and an ultra-low flatbed transport vehicle, and more particularly to an ultra-low flatbed transport vehicle for tunnel construction. Background Art

[0002] During the excavation construction process, a flatbed transport vehicle is used. The flatbed transport vehicle usually includes a flatbed vehicle and two bogies on its lower side. For example, patent application number CN201510522120.2 discloses a rail-mounted transport flatbed vehicle capable of turning in a small radius curve. The vehicle comprises a vehicle body, a fixed support is provided at the bottom of the vehicle body, a traction device is provided at each of the front and rear ends of the vehicle body, the vehicle body is 0.5-0.7 in length, and the wheelbase of the vehicle body is 3500-3900 mm; the vehicle body also includes a bogie and a brake device. The bogie is provided at the bottom of the vehicle body and connected to the vehicle body. The wheelbase between two adjacent wheel pairs in the bogie is 800-1200 mm. The brake device is provided at the bottom of the vehicle body and fixed to the bottom of the vehicle body via a fixed support.

[0003] Railways around the world use a standard gauge of 1435mm for straight track. Gauges larger than 1435mm are called wide gauges, such as 1676mm, 1524mm, and 1520mm. Gauges smaller than 1435mm are called narrow gauges, such as 1067mm, 1000mm, 762mm, and 600mm. However, most current freight car bogies use the standard gauge of 1435mm. The structure of existing bogies (primarily standard gauge) is as follows:

[0004] For example, the patent application number CN201420746925.6 discloses a railway freight car bogie with a track gauge of one meter, comprising a bolster, a side frame, a wheelset and a load-bearing saddle; the bolster is a sandwich box and is transversely installed between the main shafts of the two pairs of wheelsets, the side frames are symmetrically installed on the outside of the wheelsets, and the side frames are press-fitted with the axles through the bearings on the load-bearing saddles; the middle upper end surface of the bolster is a plane area for setting the center plate, and the height of the middle upper end surface is lower than the height of the upper planes at both ends of the bolster; symmetrical side bearing boxes are respectively provided on the upper planes at both ends, and the height of the inner bottom surface of the side bearing boxes is lower than the height of the upper planes at both ends.

[0005] For example, the patent with application number CN201520883732.X discloses a standard-gauge high-alloy bogie, including a center pin, a wheelset assembly, an axle box assembly, a side frame, an axle box spring device, an axle box support plate, a lower side bearing, an axle, a rocker, a lower center plate and a nut. The wheelset assembly serves as the running part of the bogie and contacts the rail. The axle box assembly is installed on the wheelset assembly through the axle box support plate. The wheelset assembly is connected as one with the guide frame arranged on the side frame. The axle box spring device is arranged on the rolling bearing of the wheelset assembly and is fixed to the middle position of the wheelset assembly through the guide frame of the side frame. Several springs are arranged in the axle box spring device; the axle box spring device is arranged on the upper part of the lower side bearing, and the lower side bearing is arranged on the rocker at the bottom of the side frame. The rocker is located in the middle of the axle arranged on the wheelset assembly. A lower center plate is arranged in the middle section of the rocker, and the lower center plate is fixed to the rocker by a nut.

[0006] For example, the application number is CN201520153253.2, which is a 21t axle load and 1600mm gauge bogie, comprising a front and rear wheel pair assembly, a side frame assembly, a rocker assembly, an outer cylindrical spring, an inner cylindrical spring, a braking device, a lower center plate, and an elastic side bearing. The guide frames at both ends of the side frame are installed on the front and rear wheel pair assembly through a load-bearing saddle and a rolling bearing device. The two ends of the rocker assembly are installed in the spring support platform of the side frame assembly through a spring shock-absorbing device. The rocker in the rocker assembly adopts a rocker with a side bearing box spacing a of 1270mm. The rocker and the lower center plate are an integral cast structure, and the diameter of the lower center plate is φ375mm. A manganese steel center plate wear plate with an inner diameter of φ355mm is pressed into the lower center plate.

[0007] With the advancement of modern tunneling construction, excavation diameters are shrinking, leaving less space for horizontal transportation. However, the pursuit of tight deadlines necessitates the extreme compactness of flatbed trucks (existing flatbed trucks are typically around 600mm tall and over 1500mm wide) to maximize space for transporting materials. This requires a narrow width, a narrow-gauge bogie, and a low bogie-to-carriage combination. This necessitates adjustments to the flatbed truck and bogie structures to achieve an ultra-low flatbed truck. Utility Model Content

[0008] In order to solve the above problems, the embodiment of the present invention provides a narrow-gauge bogie and an ultra-low flatbed transport vehicle, the height of which is adjusted from about 600mm in the prior art to about 400mm. The technical solution is as follows:

[0009] On the one hand, an embodiment of the present invention provides a narrow-gauge bogie, comprising two side frames 7 arranged side by side on the left and right, a bolster 8 arranged in the left and right directions, two wheelsets 9 on the side frames 7, a center plate structure 10 in the middle of the upper side of the bolster 8, two lower side bearings 11 on the upper side of the bolster 8, and springs 12 between the two ends of the bolster 8 and the side frames 7 on the corresponding sides; the middle part of the bolster 8 is bent downward to form a lower recess 13, and the plane where the top is located is located adjacent to and below the center beam 2 of the flatbed transport vehicle; the two lower side bearings 11 are respectively provided at the left and right ends of the bolster 8 and are respectively located on the outside of the side frames 7 on the corresponding sides; the rail wheels of the wheelset 9 are located on the outside of the side frames 7 on the corresponding sides, and are located on the inner side of the side beam 3 on the corresponding side of the flatbed transport vehicle; the center plate structure 10 is provided on the lower recess 13, and the wheelbase of the wheelset 9 is 700-950mm.

[0010] Among them, the two side frames 7 in the embodiment of the present invention are respectively located on the outer sides of the left and right sides of the central beam 2, and are both arranged in the front-to-back direction, and are respectively provided with a bolster hole for the bolster 8 to pass through; the two wheel pairs 9 are arranged side by side front and back and are respectively provided at the front and rear of the two side frames 7; the bolster 8 includes a lower recess 13 in the middle and horizontal parts at both ends, the lower recess 13 includes a horizontal mounting surface arranged horizontally along the left-right direction and an oblique transition section at both ends, the oblique transition section is arranged obliquely upward from the inside to the outside, and the core plate structure 10 is fixed on the horizontal mounting surface; the horizontal section is arranged horizontally along the left-right direction, and it passes outward through the bolster hole on the corresponding side, and a spring 12 is provided between the lower side of its outer end and the bottom of the side frame 7; the spring 12 is arranged vertically and is located on the outer side of the side frame 7 on the corresponding side.

[0011] Preferably, the lower side bearing 11 in the embodiment of the present invention is a metal block arranged along the front-rear direction, which is detachably fixed to the horizontal part by bolts.

[0012] Preferably, a plurality of reinforcing ribs 15 are staggeredly provided on the lower side of the bolster 8 in the embodiment of the present invention, with some of the reinforcing ribs 15 arranged side by side front to back and some of the reinforcing ribs 15 arranged side by side left to right.

[0013] Furthermore, the bogie in the embodiment of the present invention also includes two braking systems 16, which are arranged side by side on the left and right and are respectively arranged at the front end or rear end of the two side frames 7. The front end or rear end of the side frame 7 is bent outward to form a bending portion 17, and the braking system 16 is fixed to the end of the bending portion 17. A avoidance notch 6 is provided on the inner side of the side beam 3 and corresponding to the braking system 16.

[0014] Among them, the braking system 16 in the embodiment of the present invention is arranged at one end of the side frame 7 close to the middle of the flatbed transport vehicle and includes a fixed seat 61 arranged in the left and right directions, a braking part 62 on the fixed seat 61 and arranged in the front and rear directions, a boom mounting part 63 at the lower part of the fixed seat 61, a vertically arranged boom 64, a brake shoe 65 hinged in the middle part of the boom 64 and an oblong hole 66 at the upper part of the boom 64 and arranged vertically. The fixed seat 61 is arranged on the outer side of the end of the bending part 17, the braking part 62 is located on the side of the fixed seat 61 away from the side frame 7 and its telescopic rod is hinged to the boom 64 by a pin shaft passing through the oblong hole 66, and the boom mounting part 63 is located on the side of the fixed seat 61 close to the side frame 7; the brake shoe 65 is arranged in the front and rear directions, and is provided on the side of the boom 64 away from the braking part 62, and is located adjacent to the front or adjacent to the rear of the rail wheel on the corresponding side; the lower end of the boom 64 is rotatably provided on the boom mounting part 63.

[0015] On the other hand, an embodiment of the present invention also provides an ultra-low flatbed transport vehicle, including a flatbed vehicle arranged in the front-to-back direction and the two bogies mentioned above, the flatbed vehicle including a vehicle body 1 and a center beam 2, two side beams 3 and two end plates 4 on its lower side; the front and rear parts of the lower side of the center beam 2 are both concave to form an upper concave portion 18, and the two bogies are respectively arranged on the two upper concave portions 18, and the track wheels of the wheelset 9 are located on the inner side of the side beam 3 on the corresponding side; the center beam 2 is located between the two side frames 7, and is located adjacent to and above the plane where the top of the bolster 8 is located; the center plate structure 10 is arranged between the lower concave portion 13 and the upper concave portion 18.

[0016] Among them, the center beam 2 in the embodiment of the present invention is arranged at the center line of the lower side of the vehicle body 1 and is arranged along the front-to-back direction, the two side beams 3 are respectively arranged at the left and right ends of the lower side of the vehicle body 1 and are both arranged along the front-to-back direction, and the two end plates 4 are respectively arranged at the front and rear ends of the lower side of the vehicle body 1 and are both arranged along the left-right direction; a cross beam 5 is provided between the left and right sides of the center beam 2 and the side beams 3 on the corresponding sides along the left-right direction, and the cross beams 5 on the same side are arranged side by side front and back and are both provided at the bottom of the vehicle body 1; an upper side bearing 14 is provided correspondingly directly above the lower side bearing 11, and the upper side bearing 14 is welded and fixed to the lower side of the vehicle body 1.

[0017] Furthermore, in the embodiment of the present invention, the upper concave portion 18 and the middle portion of the center beam 2 are transitioned through an inclined plane to form a fish belly structure, and the depth of the upper concave portion 18 is 80-130 mm.

[0018] Specifically, the height of the flatbed transport vehicle in the embodiment of the present invention is 380-450 mm, and the width thereof is 1300-1500 mm; the distance between the plane where the top of the bolster 8 is located and the center beam 2 is 8-20 mm.

[0019] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention are as follows: the embodiment of the present invention provides a narrow-gauge bogie and an ultra-low flatbed transport vehicle, and the height of the flatbed transport vehicle is adjusted from about 600 mm in the prior art to about 400 mm; correspondingly, the track adopts a narrow-gauge track, the structure of the narrow-gauge bogie and the structure of the center beam are adjusted, and the width of the flatbed transport vehicle is adjusted from more than 1500 mm to about 1400 mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a narrow-gauge bogie in an embodiment of the present utility model;

[0021] Figure 2 This is a top view of a narrow-gauge bogie;

[0022] Figure 3 This is a bottom schematic diagram of a narrow-gauge bogie;

[0023] Figure 4 This is a front view of a narrow gauge bogie;

[0024] Figure 5 This is a dimensioned drawing of a narrow gauge bogie;

[0025] Figure 6 This is a schematic structural diagram of an ultra-low platform transport vehicle provided by an embodiment of the present utility model;

[0026] Figure 7 It is a side view of the ultra-low bed transporter;

[0027] Figure 8 yes Figure 7 A cross-sectional view of the narrow-gauge bogie;

[0028] Figure 9 This is a dimensioned drawing of the length of the ultra-low bed truck;

[0029] Figure 10 yes Figure 6 Middle AA section view;

[0030] Figure 11 This is a dimensioned drawing of the width of an ultra-low bed truck.

[0031] In the figure: 1 car body, 2 center beam, 3 side beam, 4 end plate, 5 cross beam, 6 avoidance notch, 7 side frame, 8 bolster, 9 wheelset, 10 center plate structure, 11 lower side bearing, 12 spring, 13 lower recess, 14 upper side bearing, 15 reinforcement rib, 16 braking system, 17 bent portion, 18 upper recess;

[0032] 61 fixing seat, 62 braking part, 63 suspension rod mounting part, 64 suspension rod, 65 brake shoe, 66 oblong hole. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in further detail below with reference to the accompanying drawings.

[0034] Example 1

[0035] See also Figure 1-5 Example 1 provides a narrow-gauge bogie comprising a bolster 8, a center plate structure 10, two side frames 7, two wheelsets 9, two lower side bearings 11, two sets of springs 12, and two or four braking systems 16. The two side frames 7 are arranged side by side, located on the left and right outer sides of the center beam 2, respectively. They are both arranged in the fore-aft direction, and each has a bolster hole in its center for the bolster 8 to pass through. The bolster 8 is arranged in the left-right direction, located between the two wheelsets 9. Its center is bent downward to form a recessed portion 13 (the depth of the bend ensures that the plane on which the top of the bolster 8 lies is located adjacent to and below the center beam 2 of the flatbed transport vehicle; specifically, the distance between the plane on which the top of the bolster 8 lies and the center beam 2 is 8-20 mm). The plane on which the top of the bolster 8 lies is located adjacent to and below the center beam 2 of the flatbed transport vehicle, and its left and right ends pass through the bolster holes on the corresponding sides. The two wheelsets 9 are arranged side by side in the fore-aft direction, respectively, located in front of and behind the two side frames 7, and are both arranged in the left-right direction. The rail wheels of wheelset 9 are located outside the corresponding sideframe 7 and inside the side beam 3 on the corresponding side of the flatbed truck. The wheelbase is 700-950mm. Two lower side bearings 11 are located above the left and right ends of the bolster 8, respectively, and are located outside the corresponding sideframe 7. The center plate structure 10 is located vertically on the lower recess 13 and at the midpoint of the bolster 8. It comprises a lower center plate (fixed to the lower recess 13), an upper center plate (fixed to the lower side of the center beam 2), and a pin. Two sets of springs 12 are located vertically between the end (left or right) of the bolster 8 and the bottom of the corresponding sideframe 7. If two brake systems 16 are provided, one is installed at the front or rear end of the sideframe 7. If four brake systems 16 are provided, one is installed at each of the front and rear ends of the sideframe 7. The braking system 16 is arranged in conjunction with the wheelset, consistent with the prior art.

[0036] The bolster 8 in this embodiment of the present invention comprises a central recessed portion 13 and horizontal portions at both ends. The recessed portion 13 comprises a horizontal mounting surface extending horizontally in the left-right direction and inclined transition sections at both ends. The inclined transition sections extend upward from the inside to the outside, and the core plate structure 10 (specifically, the lower core plate) is fixed to the horizontal mounting surface. The horizontal portion extends horizontally in the left-right direction and extends outward through the corresponding bolster hole. A spring 12 is installed between the lower side of its outer end and the bottom of the side frame 7.

[0037] Preferably, the lower side bearing 11 in the embodiment of the present invention is a metal block arranged in the fore-aft direction (due to limited mounting space, the structure of the lower side bearing 11 is simple). It is removably secured to the horizontal portion by bolts (specifically, two bolts are arranged side by side in the fore-aft direction). During maintenance, the lower side bearing 11 can be removed first, and then the bolster 8 and side frame 7 can be disassembled.

[0038] Preferably, a plurality of reinforcing ribs 15 are staggered on the lower side of the bolster 8 in the embodiment of the present invention to enhance the strength of the bolster 8 , with some of the reinforcing ribs 15 arranged side by side front to back and some of the reinforcing ribs 15 arranged side by side left to right.

[0039] Preferably, the end of the side frame 7 where the brake system 16 is located is longer than the other end, affecting the center beam 2 and side frame 7, resulting in a smaller bogie rotation angle. Therefore, the end of the side frame 7 where the brake system 16 is located is bent forward to form a bent portion 17. Furthermore, a clearance notch 6 is provided on the inner side of the side beam 3, corresponding to the brake system 16, to ensure the bogie's rotation angle.

[0040] The brake system 16 in this embodiment of the present invention includes a fixed base 61 arranged in a left-right direction, a brake portion 62 arranged on the fixed base 61 and arranged in a front-to-back direction, a boom mounting portion 63 below the fixed base 61, a vertical boom 64, a brake shoe 65 hingedly connected to the middle portion of the boom 64 (via a left-right rotation axis), and a vertically arranged oblong hole 66 above the boom 64. The fixed base 61 is located outside the end of the bent portion 17. The brake portion 62 is located on the side of the fixed base 61 away from the side frame 7, and its telescopic rod is hingedly connected to the boom 64 (via a left-right rotation axis) via a pin passing through the oblong hole 66. The boom mounting portion 63 is located on the side of the fixed base 61 closer to the side frame 7. The brake shoe 65 is arranged in a front-to-back direction, located on the side of the boom 64 away from the brake portion 62, and is located adjacent to or behind the corresponding rail wheel. The lower end of the boom 64 is pivotally connected (via a left-right rotation axis) to the boom mounting portion 63.

[0041] Example 2

[0042] See also Figure 1-5 Embodiment 2 provides a narrow-gauge bogie having a structure substantially identical to that of Embodiment 1, except that two brake systems 16 are provided in this embodiment. The two brake systems 16 are arranged side by side and are respectively located at the front or rear ends of the two side frames 7. The front or rear ends of the side frames 7 are bent outward to form bent portions 17, and the brake systems 16 are fixed to the ends of the bent portions 17.

[0043] Example 3

[0044] Example 3 provides a narrow-gauge bogie having a structure substantially identical to that of Example 1, except that this embodiment includes four brake systems 16. The front and rear ends of both side frames 7 are bent outward to form four bent portions 17, with the four brake systems 16 being located at the ends of each of the four bent portions 17.

[0045] Example 4

[0046] See also Figure 1-5 Example 4 provides a narrow-gauge bogie, whose structure is basically the same as that of Example 2, except that the braking system 16 in this embodiment is arranged at one end of the side frame 7 close to the middle of the flatbed transport vehicle to facilitate the installation of pipelines.

[0047] Example 5

[0048] See also Figure 5 Embodiment 5 provides a narrow-gauge bogie having a structure substantially the same as that of embodiment 1, except that the wheelbase of the wheelset 9 in this embodiment is 900 mm and the distance between the two side frames 7 is 520 mm.

[0049] Example 6

[0050] See also Figure 1-11 Example 6 provides an ultra-low platform transport vehicle, comprising a flatbed vehicle arranged in the fore-aft direction and the two bogies disclosed in Example 1. The flatbed vehicle comprises a vehicle body 1 and a center beam 2, two side beams 3, two end plates 4, and two coupler seats located below the center beam 2. The center beam 2 is located at the centerline of the lower side of the vehicle body 1 and is arranged in the fore-aft direction. The front and rear portions of the lower side of the center beam 2 are both concave, forming an upper concave portion 18. The two side beams 3 are located at the left and right ends of the lower side of the vehicle body 1 and are both arranged in the fore-aft direction. The two end plates 4 are located at the front and rear ends of the lower side of the vehicle body 1 and are both arranged in the left-right direction. Cross beams 5 are located between the left and right sides of the center beam 2 and the corresponding side beams 3. The cross beams 5 on the same side are arranged side by side in the front-back direction and are both located at the bottom of the vehicle body 1. An upper side bearing 14 is located directly above the lower side bearing 11. The upper side bearing 14 (specifically, a metal block that cooperates with the lower side bearing 11) is welded and fixed to the lower side of the vehicle body 1. The two bogies are mounted on the two upper recesses 18, with the rail wheels of wheelset 9 located inside the corresponding side beams 3. The center beam 2 is located between the two side frames 7, positioned immediately above the plane of the top of the bolster 8. The center plate structure 10 is located between the lower recess 13 and the upper recess 18.

[0051] Furthermore, the upper concave portion 18 in the embodiment of the present invention and the middle portion of the center beam 2 are transitioned through an inclined surface (the inclined surface of the front portion is inclined upward from back to front, and the inclined surface of the rear portion is inclined upward from front to back) to form a fish belly structure, and the depth of the upper concave portion 18 is 80-130 mm.

[0052] Specifically, the height of the flatbed transport vehicle in the embodiment of the present invention is 380-450 mm, the width is 1300-1500 mm, and the distance between the plane where the top of the bolster 8 is located and the center beam 2 is 8-20 mm.

[0053] Example 7

[0054] See also Figure 9 and 11 Example 7 provides an ultra-low platform transport vehicle, the structure of which is substantially the same as that of Example 6, except that the platform transport vehicle in this embodiment of the utility model has a height of 400 mm and a width of 1400 mm. The distance between the plane on which the top of the bolster 8 lies and the center beam 2 is 10 mm. The thickness of the center beam 2 is 240 mm, and the thickness of the upper recess 18 is 133 mm.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A narrow-gauge bogie comprising two side frames (7) arranged side by side, a bolster (8) arranged in a left-right direction, two wheel pairs (9) on the side frames (7), a center plate structure (10) in the middle of the upper side of the bolster (8), two lower side bearings (11) on the upper side of the bolster (8), and springs (12) between the two ends of the bolster (8) and the side frames (7) on the corresponding sides; characterized in that: The middle part of the bolster (8) is bent downward to form a lower concave part (13), and the plane where the top part is located is located adjacent to and below the center beam (2) of the flatbed transport vehicle; two lower side supports (11) are respectively provided at the left and right ends of the bolster (8) and are respectively located on the outside of the side frame (7) on the corresponding side; the track wheels of the wheelset (9) are located on the outside of the side frame (7) on the corresponding side and are located on the inside of the side beam (3) on the corresponding side of the flatbed transport vehicle; the center plate structure (10) is provided on the lower concave part (13), and the wheelbase of the wheelset (9) is 700-950mm.

2. The narrow-gauge bogie according to claim 1, characterized in that: The two side frames (7) are respectively located on the outer sides of the left and right sides of the center beam (2), and are both arranged in the front-back direction. The middle part of each side frame is provided with a bolster hole for the bolster (8) to pass through; the two wheel pairs (9) are arranged side by side in the front-back direction and are respectively arranged at the front and rear parts of the two side frames (7); the bolster (8) includes a lower concave portion (13) in the middle part and horizontal portions at both ends, the lower concave portion (13) includes a horizontal mounting surface arranged horizontally in the left-right direction and an oblique transition section at both ends, the oblique transition section is arranged obliquely upward from the inside to the outside, and the core plate structure (10) is fixed on the horizontal mounting surface; the horizontal portion is horizontally arranged in the left-right direction, and passes through the bolster hole on the corresponding side outward, and a spring (12) is provided between the lower side of the outer end and the bottom of the side frame (7); the spring (12) is arranged vertically and is located on the outer side of the side frame (7) on the corresponding side.

3. The narrow-gauge bogie according to claim 2, characterized in that: The lower side bearing (11) is a metal block arranged in the front-back direction and is detachably fixed to the horizontal part by bolts.

4. The narrow-gauge bogie according to claim 1, characterized in that: A plurality of reinforcing ribs (15) are staggeredly arranged on the lower side of the bolster (8), with some of the reinforcing ribs (15) arranged side by side front to back, and the other part of the reinforcing ribs (15) arranged side by side left to right.

5. The narrow-gauge bogie according to claim 1, characterized in that: The bogie further comprises two braking systems (16), which are arranged side by side on the left and right and are respectively arranged at the front end or rear end of the two side frames (7), the front end or rear end of the side frames (7) being bent outward to form a bent portion (17), the braking system (16) being fixed to the end of the bent portion (17), and a avoidance notch (6) being provided on the inner side of the side beam (3) and corresponding to the braking system (16).

6. The narrow-gauge bogie according to claim 5, characterized in that: The braking system (16) is arranged at one end of the side frame (7) near the middle of the flatbed transport vehicle and includes a fixing seat (61) arranged in the left and right directions, a braking portion (62) on the fixing seat (61) and arranged in the front and rear directions, a boom mounting portion (63) at the lower part of the fixing seat (61), a boom (64) arranged vertically, a brake shoe (65) hinged in the middle of the boom (64), and an oblong hole (66) at the upper part of the boom (64) and arranged vertically. The fixing seat (61) is arranged on the outer side of the end of the bending portion (17). The braking portion (62) is located on a side of the fixed seat (61) away from the side frame (7), and its telescopic rod is hinged to the suspension rod (64) through a pin shaft passing through the oblong hole (66); the suspension rod mounting portion (63) is located on a side of the fixed seat (61) close to the side frame (7); the brake shoe (65) is arranged in a front-to-back direction, and is located on a side of the suspension rod (64) away from the braking portion (62), and is located adjacent to the front or adjacent to the rear of the rail wheel on the corresponding side; the lower end of the suspension rod (64) is rotatably arranged on the suspension rod mounting portion (63).

7. An ultra-low platform transport vehicle, comprising a flatbed vehicle arranged in a front-to-rear direction, wherein the flatbed vehicle comprises a vehicle body (1) and a center beam (2) on its lower side, two side beams (3) and two end plates (4); characterized in that: The flatbed transport vehicle also includes two bogies as described in any one of claims 1 to 6; the front and rear parts of the lower side of the center beam (2) are both concave to form an upper concave portion (18), and the two bogies are respectively arranged on the two upper concave portions (18), and the track wheels of the wheelset (9) are located on the inner side of the side beam (3) on the corresponding side; the center beam (2) is located between the two side frames (7), and is located adjacent to and above the plane where the top of the rocker (8) is located; the center plate structure (10) is arranged between the lower concave portion (13) and the upper concave portion (18).

8. The ultra-low bed transport vehicle according to claim 7, characterized in that: The center beam (2) is arranged at the center line of the lower side of the vehicle body (1) and is arranged in the front-back direction; the two side beams (3) are respectively arranged at the left and right ends of the lower side of the vehicle body (1) and are both arranged in the front-back direction; the two end plates (4) are respectively arranged at the front and rear ends of the lower side of the vehicle body (1) and are both arranged in the left-right direction; a cross beam (5) is arranged between the left and right sides of the center beam (2) and the side beams (3) on the corresponding sides in the left-right direction; the cross beams (5) on the same side are arranged side by side in the front-back direction and are both arranged at the bottom of the vehicle body (1); an upper side bearing (14) is correspondingly arranged directly above the lower side bearing (11), and the upper side bearing (14) is welded and fixed to the lower side of the vehicle body (1).

9. The ultra-low bed transport vehicle according to claim 7, characterized in that: The upper concave portion (18) and the middle portion of the center beam (2) are transitioned via an inclined plane to form a fish belly structure, and the depth of the upper concave portion (18) is 80-130 mm.

10. The ultra-low bed transport vehicle according to claim 7, characterized in that: The height of the flatbed transport vehicle is 380-450 mm, and the width is 1300-1500 mm; the distance between the plane where the top of the bolster (8) is located and the center beam (2) is 8-20 mm.

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