CN206719061U - Vehicle transport central axle train - Google Patents

Abstract

The utility model discloses a central axle train for vehicle transportation, which includes a traction main vehicle part, a central axle trailer part and a connecting coupler; the traction main vehicle part includes a chassis, an auxiliary frame, a main vehicle side piece, a The front upper flip platform, the main vehicle rear upper platform, and the rear flip springboard, the center axle trailer part is composed of the drawbar, trailer frame, trailer side piece, trailer upper platform, flip springboard mechanism, traction main vehicle part and center axle trailer part Connects to the towbar via a connection coupler. The central axle train for vehicle transportation proposed by the utility model realizes the stacking of vehicles through multiple groups of overturned springboards, effectively utilizes the loading space, makes the loading more flexible and compact, and can meet the needs of commercial vehicles of different brands and sizes. Mixed loading, it can be loaded to more than the existing vehicle transport semi-trailer. The main car and the trailer of the train are connected by hinges, and the hinge point is between the main car and the trailer, so the turning radius is small and the vehicle passability is good.

Description

Vehicle Transportation Center Axle Train

technical field

The utility model belongs to the technical field of transport vehicles, and relates to a vehicle transport vehicle, in particular to a vehicle transport center axle train.

Background technique

At present, most commercial vehicle transport vehicles in China are frame-type semi-trailer structures, which can be loaded through two upper and lower loading platforms. According to national standards, ordinary frame-type vehicle transport semi-trailers can only load 6 small cars, and the transport efficiency is very low.

With the rapid development of the vehicle-mounted automobile industry and the improvement of domestic living standards, the domestic demand for family cars is increasing, and the transportation efficiency of ordinary frame-type vehicles transporting semi-trailers cannot meet the needs; therefore, domestic automobile logistics companies currently use over-limit Vehicle transport Semi-trailers are used to transport cars, and the number of loaded vehicles is generally more than 12. The length of such vehicles is generally more than 30 meters, and the width after loading is more than 3 meters. The external dimensions seriously exceed the standard, and there are great safety hazards in the operation of the vehicles, and accidents occur frequently.

In view of this, there is an urgent need to design a new vehicle transportation mode in order to overcome the above-mentioned defects in the existing transportation mode.

Utility model content

The technical problem to be solved by the utility model is: to provide a vehicle transport center-axle train to overcome the shortcomings of ordinary frame-type vehicles for transporting semi-trailers and overrun vehicles.

In order to solve the above technical problems, the utility model adopts the following technical solutions:

A center-axle train for vehicle transportation, said train comprising: a traction main car part, a center-axle trailer part, a connecting coupler, a hydraulic system, an air system, and an electric circuit system;

The traction main vehicle part includes chassis, sub-frame, main vehicle side panels, main vehicle front upper turning platform, main vehicle rear upper platform, tail turning springboard; center axle trailer part includes drawbar, trailer frame, trailer side Plate, trailer upper platform, flip springboard mechanism, traction main vehicle part and central axle trailer part are hinged together with the traction rod through the connecting coupler;

The rear axle of the chassis adopts air suspension, and a control switch is installed in the cab to control the air suspension airbag of the rear axle to adjust the height of the main vehicle;

The subframe is a welded rigid structure, which is mainly welded by side longitudinal beams, beams and panels. In addition, the bottom of the subframe is equipped with side protection and tool boxes, and the rear and lower part of the subframe is equipped with a tow hook beam for Install the connection coupler;

The side panel of the main car is divided into a left side panel and a right side panel, which are welded on the left and right sides of the vehicle frame by the top beam and the front, middle and rear columns. A hydraulic cylinder is installed inside to realize the lifting and lowering of the slider through the expansion and contraction of the hydraulic cylinder;

The front upper turning platform of the main vehicle is mainly composed of a front crossbeam, left and right longitudinal beams and a turning springboard of the front upper platform. It is connected with the slider in the front pillar of the main car side piece through the pin shaft;

The rear upper platform of the main vehicle is mainly welded by side longitudinal beams, cross beams and panels, and is connected with the slider in the middle column of the side piece and the rear column through the pin shaft. In addition, the rear upper platform of the main vehicle is equipped with a pull Springboard, pull the springboard can be pulled out backwards, the front end of the main vehicle rear upper platform is equipped with a platform flipping springboard, which is connected with the crossbeam of the main vehicle rear upper platform through a pin shaft, and a pair of hydraulic cylinders are installed under the flipping platform, and the platform flipping springboard is realized through the expansion and contraction of the oil cylinders flip;

The tail turning springboard is welded by rectangular pipe profiles and panels, the front end of the tail turning springboard is connected with the rear beam of the subframe through a pin shaft, and an oil cylinder is installed under the tail turning springboard, and the turning of the tail turning springboard is realized through the expansion and contraction of the oil cylinder;

The drawbar is a welded steel hook, which is welded by steel plates. The front end of the drawbar is welded with a connecting plate, and the connecting plate has threaded holes for fixing the drawhook connected to the coupler. The rear end of the drawbar is welded to the trailer frame together;

The trailer frame is a welded rigid structure, which is mainly welded by side longitudinal beams, beams and panels. The bottom of the trailer frame is equipped with suspension, axles, steel rings and tires, and the trailer is driven by the traction main vehicle;

The trailer side piece is divided into a left side piece and a right side piece, which is composed of a top beam, front and rear columns, and a middle circular tube column, and is welded on the left and right sides of the vehicle frame. Equipped with sliders, the inner car of the side piece of the trailer is equipped with an oil cylinder and a wire rope pulley block mechanism, which drives the wire rope pulley block mechanism through the expansion and contraction of the oil cylinder to realize the lifting of the platform;

The upper platform of the trailer is mainly welded by side longitudinal beams, cross beams and panels, and is connected with the sliders in the middle column of the side piece and the rear column through the pin shaft;

The flipping springboard mechanism includes a flipping springboard, a flipping oil cylinder, and a hinge. The flipping springboard is welded by profiles and panels. The front end is connected to the trailer frame through a hinge. Alternatively, the flipping springboard mechanism includes: a flipping springboard, a flipping oil cylinder, a triangular arm, and a pull rod; the trailer frame is connected to the flipping springboard, and the top of the flipping springboard is used to set the vehicle; the three corners of the triangular arm are respectively connected to the flipping springboard , overturning oil cylinder and pull rod connection; the overturning oil cylinder is provided with a hydraulic control valve, and the hydraulic control valve is operated to control the lifting of the overturning cylinder under the overturning springboard, and the overturning oil cylinder drives the triangular arm and the pull rod to lift, and the triangular arm will overturn during the lifting process. The lifting stroke of the oil cylinder is enlarged, and finally drives the flipping springboard to lift; after the flipping springboard is lifted in place, a car can be inserted under the flipping springboard to realize the stacking of vehicles, make full use of the loading space, and shorten the loading length .

A center-mounted axle train for vehicle transportation, the train includes: a traction main car part, a center-mounted axle trailer part, and a connecting coupler;

The traction main vehicle part includes chassis, auxiliary frame, main vehicle side panels, main vehicle front upper turning platform, main vehicle rear upper platform, rear turning springboard, and the center shaft trailer part consists of a drawbar, a trailer frame, a trailer side Plate, trailer upper platform, turning springboard mechanism, traction main vehicle part and central axle trailer part are connected with the traction bar through the connecting coupler.

As a preferred solution of the present invention, the rear axle of the chassis adopts air suspension, and a control switch is installed in the driver's cab to control the air suspension airbag lifting of the rear axle to realize the height adjustment of the main vehicle;

The subframe is a welded rigid structure, which is mainly welded by side longitudinal beams, beams and panels. In addition, the bottom of the subframe is equipped with side protection and tool boxes, and the rear and lower part of the subframe is equipped with a tow hook beam for Install the connection coupler;

The side panel of the main car is divided into a left side panel and a right side panel, which are welded on the left and right sides of the vehicle frame by the top beam and the front, middle and rear columns. A hydraulic cylinder is installed inside to realize the lifting and lowering of the slider through the expansion and contraction of the hydraulic cylinder;

The front upper turning platform of the main vehicle is mainly composed of a front crossbeam, left and right longitudinal beams and a turning springboard of the front upper platform. It is connected with the slider in the front pillar of the main car side piece through the pin shaft;

The rear upper platform of the main vehicle is mainly welded by side longitudinal beams, cross beams and panels, and is connected with the slider in the middle column of the side piece and the rear column through the pin shaft. In addition, the rear upper platform of the main vehicle is equipped with a pull Springboard, pull the springboard can be pulled out backwards, the front end of the main vehicle rear upper platform is equipped with a platform flipping springboard, which is connected with the crossbeam of the main vehicle rear upper platform through a pin shaft, and a pair of hydraulic cylinders are installed under the flipping platform, and the platform flipping springboard is realized through the expansion and contraction of the oil cylinders flip;

The tail turning springboard is welded by rectangular pipe profiles and panels. The front end of the tail turning springboard is connected to the rear beam of the subframe through a pin shaft. An oil cylinder is installed under the tail turning springboard.

As a preferred solution of the utility model, the drawbar is a welded steel hook, which is welded by steel plates. The front end of the drawbar is welded with a connecting plate, and the connecting plate is provided with a threaded hole for fixing the drawing hook of the coupler. , the rear end of the drawbar is welded to the trailer frame;

The trailer frame is a welded rigid structure, which is mainly welded by side longitudinal beams, beams and panels. The bottom of the trailer frame is equipped with suspension, axles, steel rings and tires, and the trailer is driven by the traction main vehicle;

The trailer side piece is divided into a left side piece and a right side piece, which is composed of a top beam, front and rear columns, and a middle circular tube column, and is welded on the left and right sides of the vehicle frame. Equipped with sliders, the inner car of the side piece of the trailer is equipped with an oil cylinder and a wire rope pulley block mechanism, which drives the wire rope pulley block mechanism through the expansion and contraction of the oil cylinder to realize the lifting of the platform;

The upper platform of the trailer is mainly composed of side longitudinal beams, cross beams and panels welded together, and is connected with the sliders in the middle column of the side piece and the rear column through pin shafts.

As a preferred solution of the present utility model, the flipping springboard mechanism includes a flipping springboard, a flipping drive mechanism, and a connecting mechanism; the flipping springboard is connected to the trailer frame, the flipping driving mechanism, and the connecting mechanism, and is driven by the flipping drive mechanism and the connecting mechanism. Flip the springboard to flip.

As a preferred solution of the utility model, the turning drive mechanism is a turning cylinder, the connecting mechanism is a hinge, the turning springboard is assembled and welded by profiles and panels, the front end is connected with the frame through a hinge, and the turning cylinder is installed at the rear end. The turning of the turning springboard is realized through the expansion and contraction of the oil cylinder.

As a preferred solution of the present utility model, the flipping springboard mechanism includes: a flipping springboard, a flipping oil cylinder, a triangular arm, and a pull rod;

The frame and the flipping springboard are welded rigid structures, and the top of the flipping springboard is used to set up the vehicle;

The three corners of the triangular arm are respectively connected with the flip springboard, the flip cylinder, and the pull rod;

The turning cylinder is equipped with a hydraulic control valve, which is operated to control the lifting of the turning cylinder below the turning board, and the turning cylinder drives the triangular arm and the pull rod to lift, and the triangular arm amplifies the lifting stroke of the turning cylinder during the lifting process. Finally, it drives the flipping springboard to lift.

As a preferred solution of the present utility model, when it is necessary to transport commercial vehicles, the upper vehicle is first loaded, and the hydraulic control valve group on the trailer is operated to control the action of the oil cylinder in the rear column of the side piece of the trailer, so that the tail of the upper platform of the trailer is lowered to On the trailer frame, hang the climbing springboard at the rear of the trailer frame, then pull out the pull-out springboard at the rear of the upper platform of the main vehicle and the pull-out springboard at the front of the upper platform of the trailer, and operate the hydraulic control valve of the main vehicle to control the main vehicle. The oil cylinder in the rear column of the side piece moves, so that the rear upper platform of the main vehicle is docked with the upper platform of the trailer, and the upper platform starts to be loaded. Five vehicles are loaded on the upper platform, and the first and second vehicles of the main vehicle can be loaded. By operating the hydraulic valve group on the main vehicle, the front upturning platform of the main vehicle is controlled, and the turning springboard at the front end of the rear upper platform of the main vehicle is raised to realize stacking of vehicles. After the upper vehicle is loaded, retract the pull springboard at the front of the trailer upper platform, operate the hydraulic valve group to raise the rear upper platform of the main vehicle and the upper platform of the trailer, and then install a climbing springboard between the main vehicle and the trailer to start When loading the vehicle on the lower level, the first and second vehicles on the lower level of the trailer can control the flipping springboard of the trailer by operating the hydraulic valve group on the trailer, so as to realize the stacking of vehicles on the lower level of the trailer.

With the upcoming release of the new version of GB1589, the state will gradually strengthen the crackdown on such illegal vehicles. The new standard will include center-axle trailers in the announcement management and allow center-axle trains to operate on the road. Due to the loading efficiency of vehicle transportation center-axle trains It is higher than ordinary frame-type vehicles for transporting semi-trailers, so the center-axle train for vehicle transport will become the mainstream model of domestic vehicle transport in the future.

The beneficial effect of the utility model is that: the vehicle transportation central axle train proposed by the utility model realizes the stacking of vehicles through multiple groups of overturned springboards, effectively utilizes the loading space, makes the loading more flexible and compact, and can meet the needs of different brands 1. Mixed loading of commercial vehicles with large size differences can be loaded with 2 to 3 more vehicles than the existing vehicle transport semi-trailer. The main car and the trailer of the train are connected by hinges, and the hinge point is between the main car and the trailer, so the turning radius is small and the vehicle passability is good. In addition, the car is made of high-strength steel plate, with simple structure and light weight.

Description of drawings

Fig. 1 is a schematic structural view of the vehicle transport center axle train of the present invention.

Fig. 2 is a schematic diagram of the vehicle loading of the vehicle transport center axle train of the present invention.

detailed description

Preferred embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings.

Embodiment one

Please refer to Fig. 1 and Fig. 2, the utility model discloses a vehicle transport center axle train, the train includes: traction main car part, center axle trailer part, connecting coupler 12, hydraulic system, air system, electrical system;

The traction main vehicle part includes chassis 1, sub-frame 2, main vehicle side panel 3, main vehicle front upper turning platform 4, main vehicle rear upper platform 5, rear turning springboard 6; center axle trailer part includes traction rod 7 , the trailer frame 8, the trailer side piece 9, the trailer upper platform 10, the flipping springboard mechanism 11, the traction main vehicle part and the central shaft trailer part are hinged together with the drawbar through the connecting coupler 12;

The rear axle of the chassis 1 adopts air suspension, and a control switch is installed in the cab to control the air suspension airbag lifting of the rear axle to realize the height adjustment of the main vehicle;

The sub-frame 2 is a welded rigid structure, which is mainly composed of side longitudinal beams, beams and panels. In addition, the bottom of the sub-frame 2 is equipped with side protection and a tool box, and the rear and lower part of the sub-frame 2 is equipped with a tow hook beam. , for installing the connection coupler 12;

The side panels of the main vehicle are divided into three parts, the left panel and the right panel, which are welded on the left and right sides of the vehicle frame by the top beam and the front, middle and rear columns. The column is equipped with a hydraulic cylinder to realize the lifting and lowering of the slider through the expansion and contraction of the hydraulic cylinder;

The front upper turning platform 4 of the main vehicle is mainly composed of a front crossbeam, left and right longitudinal beams and a turning springboard of the front upper platform. , through the pin shaft and the slide block in the front column of the main car side panel 3;

The rear upper platform 5 of the main vehicle is mainly welded by side longitudinal beams, cross beams and panels, and is connected with the slide block in the middle column of the side piece and the rear column through a pin shaft. In addition, the rear upper platform 5 of the main vehicle is equipped with a Pull-out springboard, the pull-out springboard can be pulled out backwards, the front end of the upper platform at the rear of the main vehicle is equipped with a platform turning springboard, which is connected with the crossbeam of the upper platform at the rear of the main vehicle through pin shafts, and a pair of hydraulic cylinders are installed under the turning platform, and the platform is realized through the expansion and contraction of the oil cylinders. Flip springboard flip;

The tail turning springboard 6 is welded by rectangular pipe profiles and panels, the front end of the tail turning springboard is connected with the rear beam of the subframe through a pin shaft, and an oil cylinder is installed under the tail turning springboard, and the tail turning springboard is turned over by stretching and contracting the oil cylinder;

The drawbar 7 is a welded steel hook, which is welded by steel plates. The front end of the drawbar 7 is welded with a connecting plate, and the connecting plate is provided with a threaded hole, which is used to fix the drawhook connected to the coupler 12. The rear end of the drawbar is connected to the trailer. Vehicle frame 8 is welded together;

The trailer frame 8 is a welded rigid structure, which is mainly welded by side longitudinal beams, beams and panels. The bottom of the trailer frame 8 is equipped with suspension, axles, steel rings and tires, and the trailer is driven by the traction main vehicle;

The trailer side piece 9 is divided into a left side piece and a right side piece, which is composed of a top beam, front and rear columns, and a middle circular tube column, and is welded on the left and right sides of the vehicle frame. The inner side of the groove is equipped with a slide block, and the trailer side piece 9 is equipped with an oil cylinder and a wire rope pulley block mechanism, which drives the wire rope pulley block mechanism through the expansion and contraction of the oil cylinder to realize platform lifting;

The upper platform 10 of the trailer is mainly welded by side longitudinal beams, cross beams and panels, and is connected with the sliders in the middle column of the side piece and the rear column through the pin shaft;

The flipping springboard mechanism 11 includes a flipping springboard, a flipping oil cylinder, and a hinge. The flipping springboard is welded by profiles and panels. The front end is connected to the trailer frame 8 through a hinge. Flip; or, the flip springboard mechanism 11 includes: a flip springboard, a flip cylinder, a triangular arm, a pull rod; the trailer frame 8 is connected to the flip springboard, and the top of the flip springboard is used to set the vehicle; the three corners of the triangular arm They are respectively connected with the turning board, turning cylinder and pull rod; the turning cylinder is equipped with a hydraulic control valve, which is operated to control the lifting of the turning cylinder under the turning platform, and the turning cylinder drives the triangular arm and the pull rod to lift, and the triangular arm is lifted In the process, the lifting stroke of the turning cylinder is enlarged, and finally the turning springboard is lifted; after the turning springboard is lifted in place, a car can be inserted under the turning springboard to realize stacking of vehicles and make full use of the loading space. Shorten the loading length;

When it is necessary to ship commercial vehicles, first load the upper layer vehicle, and control the action of the oil cylinder in the rear column of the trailer side piece 9 by operating the hydraulic control valve group on the trailer, so that the tail of the trailer upper platform 10 is lowered to the trailer frame 8, and the climbing The car springboard is hung at the rear of the trailer frame, and then the pull-out springboard at the rear of the upper platform 5 of the main vehicle and the pull-out springboard at the front of the trailer upper platform 10 are pulled out to operate the hydraulic control valve of the main vehicle to control the rear column of the side panel 3 of the main vehicle The oil cylinder inside moves, so that the rear upper platform 5 of the main vehicle is docked with the upper platform 10 of the trailer, and the upper platform starts to be loaded, and five vehicles are loaded on the upper platform. The hydraulic valve group on the main vehicle controls the front upper turning platform 4 of the main vehicle, and the turning springboard at the front end of the upper platform 5 behind the main vehicle rises to realize stacking of the vehicles. After the upper vehicle is loaded, retract the pull springboard at the front of the trailer upper platform 10, and operate the hydraulic valve group to raise the rear upper platform 5 of the main vehicle and the upper platform 10 of the trailer, and then install the climbing car between the main vehicle and the trailer The springboard starts to get off and load the vehicles. When the lower layer is loaded, the first and second vehicles on the lower layer of the trailer can control the trailer to turn over the springboard by operating the hydraulic valve group on the trailer, so as to realize the stacking of the vehicles on the lower layer of the trailer.

Embodiment two

Please refer to Fig. 1, the utility model discloses a vehicle transport center axle train, the train includes: traction main car part, center axle trailer part, connecting coupler 12;

The traction main vehicle part includes chassis 1, auxiliary frame 2, main vehicle side panel 3, main vehicle front upper turning platform 4, main vehicle rear upper platform 5, rear turning springboard 6, and the central axle trailer part is formed by a traction rod 7 , trailer frame 8, trailer side piece 9, trailer upper platform 10, flip springboard mechanism 11, traction main vehicle part and central axle trailer part are connected with drawbar by connecting coupler 12.

To sum up, the vehicle transportation central axle train proposed by the utility model realizes the stacking of vehicles through multiple sets of overturned springboards, effectively utilizes the loading space, makes loading more flexible and compact, and can meet different brands and size differences Larger commercial vehicles are mixed, which can be loaded with 2 to 3 more vehicles than the existing vehicle transport semi-trailer. The main car and the trailer of the train are connected by hinges, and the hinge point is between the main car and the trailer, so the turning radius is small and the vehicle passability is good. In addition, the car is made of high-strength steel plate, with simple structure and light weight.

The description and application of the present invention here are illustrative, and are not intended to limit the scope of the present invention to the above-mentioned embodiments. Variations and changes to the embodiments disclosed herein are possible, and substitutions and equivalents for various components of the embodiments are known to those of ordinary skill in the art. It should be clear to those skilled in the art that, without departing from the spirit or essential characteristics of the present invention, the present invention can be realized in other forms, structures, arrangements, proportions, and with other components, materials and parts. Other modifications and changes may be made to the embodiments disclosed herein without departing from the scope and spirit of the invention.

Claims (7)

1. A central axle train for vehicle transportation, characterized in that, the train comprises: traction main car part, central axle trailer part, connecting coupler (12), hydraulic system, air system, circuit system; The traction main vehicle part includes a chassis (1), an auxiliary frame (2), a main vehicle side piece (3), a main vehicle front upper turning platform (4), a main vehicle rear upper platform (5), a rear turning springboard ( 6); The central axle trailer part includes the drawbar (7), trailer frame (8), trailer side piece (9), trailer upper platform (10), turning springboard mechanism (11), traction main vehicle part and central The axle trailer part is hinged together with the drawbar through the connecting coupler (12); The rear axle of the chassis (1) adopts air suspension, and a control switch is installed in the cab to control the air suspension airbag lifting of the rear axle to realize the adjustable height of the main vehicle; The sub-frame (2) is a welded rigid structure, which is mainly welded by side longitudinal beams, beams and panels. In addition, the bottom of the sub-frame (2) is equipped with side protection and a tool box. The rear of the sub-frame (2) The tow hook crossbeam is equipped with below, is used for installing connection coupler (12); The side panel (3) of the main vehicle is divided into a left panel and a right panel, which are welded on the left and right sides of the vehicle frame by the top beam and the front, middle and rear columns. Block, the column is equipped with a hydraulic cylinder to realize the lifting of the slider through the expansion and contraction of the hydraulic cylinder; The front upper turning platform (4) of the main vehicle is mainly composed of a front beam, a left and right longitudinal beam and a turning springboard of the front upper platform. The chute is connected with the slide block in the front column of the main car side piece (3) through the pin shaft; The rear upper platform (5) of the main vehicle is mainly welded by side longitudinal beams, cross beams and panels, and is connected with the sliders in the middle column of the side piece and the rear column through pin shafts. In addition, the rear upper platform (5) of the main vehicle The rear end is equipped with a pull-out springboard, which can be pulled out backwards. A platform turning springboard is installed in the front end of the rear upper platform of the main vehicle, which is connected with the crossbeam of the main vehicle rear upper platform through pin shafts. The oil cylinder telescopically realizes the flipping of the springboard of the platform; The tail turning springboard (6) is welded by rectangular pipe profiles and panels, the front end of the tail turning springboard is connected with the rear beam of the subframe through a pin shaft, and an oil cylinder is installed under the tail turning springboard, and the tail turning springboard is turned over by stretching and contracting the oil cylinder; The drawbar (7) is a welded steel hook, which is welded by steel plates. The front end of the drawbar (7) is welded with a connecting plate, and the connecting plate is provided with a threaded hole for fixing the drawing hook of the coupler (12). The rear end of the drawbar is welded together with the trailer frame (8); The trailer frame (8) is a welded rigid structure, which is mainly welded by side longitudinal beams, beams and panels. The bottom of the trailer frame (8) is equipped with suspension, axles, steel rings and tires. towing a trailer; The trailer side piece (9) is divided into a left side piece and a right side piece, and is composed of a top beam, front and rear columns, and a middle circular tube column, and is welded on the left and right sides of the vehicle frame. The front and rear columns of the trailer side piece (9) have Chute, the inside of the chute is equipped with a slide block, and the car in the trailer side piece (9) is equipped with an oil cylinder and a wire rope pulley block mechanism, which drives the wire rope pulley block mechanism through the expansion and contraction of the oil cylinder to realize platform lifting; The trailer upper platform (10) is mainly welded by side longitudinal beams, cross beams and panels, and is connected with the sliders in the middle column of the side piece and the rear column through the pin shaft; The flipping springboard mechanism (11) includes a flipping springboard, a flipping oil cylinder, and a hinge. The flipping springboard is welded by profiles and panels. The front end is connected to the trailer frame (8) through a hinge. Realize the overturning of the overturning springboard; or, the overturning springboard mechanism (11) includes: an overturning springboard, an overturning oil cylinder, a triangle arm, and a pull rod; the trailer frame (8) is connected to the overturning springboard, and the overturning springboard is used for setting up vehicles; The three corners of the triangular arm are respectively connected with the flipping springboard, the flipping cylinder and the pull rod; the flipping cylinder is provided with a hydraulic control valve, which is operated to control the lifting of the flipping cylinder below the flipping springboard, and the flipping cylinder drives the triangular arm and the pull rod Lifting, the triangular arm amplifies the lifting stroke of the flipping cylinder during the lifting process, and finally drives the flipping springboard to lift; after the flipping springboard is lifted in place, a car can be inserted under the flipping springboard to realize the stacking of vehicles To make full use of the loading space and shorten the loading length. 2. A central axle train for vehicle transportation, characterized in that, the train comprises: a traction main car part, a central axle trailer part, and a connecting coupler (12); The traction main vehicle part includes a chassis (1), an auxiliary frame (2), a main vehicle side piece (3), a main vehicle front upper turning platform (4), a main vehicle rear upper platform (5), a rear turning springboard ( 6), the central axle trailer part is composed of the drawbar (7), trailer frame (8), trailer side piece (9), trailer upper platform (10), flip springboard mechanism (11), traction main vehicle part and central The axle-trailer part is connected to the drawbar through a connecting coupler (12). 3. The vehicle transport center axle train according to claim 2, characterized in that: The rear axle of the chassis (1) adopts air suspension, and a control switch is installed in the cab to control the air suspension airbag lifting of the rear axle to realize the adjustable height of the main vehicle; The sub-frame (2) is a welded rigid structure, which is mainly welded by side longitudinal beams, beams and panels. In addition, the bottom of the sub-frame (2) is equipped with side protection and a tool box. The rear of the sub-frame (2) The tow hook crossbeam is equipped with below, is used for installing connection coupler (12); The side panel (3) of the main vehicle is divided into a left panel and a right panel, which are welded on the left and right sides of the vehicle frame by the top beam and the front, middle and rear columns. Block, the column is equipped with a hydraulic cylinder to realize the lifting of the slider through the expansion and contraction of the hydraulic cylinder; The front upper turning platform (4) of the main vehicle is mainly composed of a front beam, a left and right longitudinal beam and a turning springboard of the front upper platform. The chute is connected with the slide block in the front column of the main car side piece (3) through the pin shaft; The rear upper platform (5) of the main vehicle is mainly welded by side longitudinal beams, cross beams and panels, and is connected with the sliders in the middle column of the side piece and the rear column through pin shafts. In addition, the rear upper platform (5) of the main vehicle The rear end is equipped with a pull-out springboard, which can be pulled out backwards. A platform turning springboard is installed in the front end of the rear upper platform of the main vehicle, which is connected with the crossbeam of the main vehicle rear upper platform through pin shafts. The oil cylinder telescopically realizes the flipping of the springboard of the platform; The tail turning springboard (6) is welded by rectangular pipe profiles and panels. The front end of the tail turning springboard is connected to the rear beam of the subframe through a pin shaft. An oil cylinder is installed under the tail turning springboard. 4. The vehicle transport center axle train according to claim 2, characterized in that: The drawbar (7) is a welded steel hook, which is welded by steel plates. The front end of the drawbar (7) is welded with a connecting plate, and the connecting plate is provided with a threaded hole, which is used to fix the drawing hook connected to the coupler (12). The rear end of the drawbar is welded together with the trailer frame (8); The trailer frame (8) is a welded rigid structure, which is mainly welded by side longitudinal beams, beams and panels. The bottom of the trailer frame (8) is equipped with suspension, axles, steel rings and tires. towing a trailer; The trailer side piece (9) is divided into a left side piece and a right side piece, and is composed of a top beam, front and rear columns, and a middle circular tube column, and is welded on the left and right sides of the vehicle frame. There are Chute, the inside of the chute is equipped with a slide block, and the car in the trailer side piece (9) is equipped with an oil cylinder and a wire rope pulley block mechanism, which drives the wire rope pulley block mechanism through the expansion and contraction of the oil cylinder to realize platform lifting; The upper platform (10) of the trailer is mainly welded by side longitudinal beams, cross beams and panels, and is connected with slide blocks in the middle column of the side piece and the rear column through pin shafts. 5. The vehicle transport center axle train according to claim 2, characterized in that: The flipping springboard mechanism (11) includes a flipping springboard, a flipping drive mechanism, and a connecting mechanism; the flipping springboard is connected to the trailer frame (8), the flipping drive mechanism, and the connecting mechanism, and the flipping springboard is driven to turn over by the flipping drive mechanism and the connecting mechanism. 6. The vehicle transport center axle train according to claim 5, characterized in that: The turning drive mechanism is a turning cylinder, the connecting mechanism is a hinge, and the turning springboard is welded by profiles and panels. 7. The vehicle transport center axle train according to claim 2, characterized in that: The flip springboard mechanism includes: a flip springboard, a flip cylinder, a triangular arm, and a pull rod; The frame and the flipping springboard are welded rigid structures, and the top of the flipping springboard is used to set up the vehicle; The three corners of the triangular arm are respectively connected with the flip springboard, the flip cylinder, and the pull rod; The turning cylinder is provided with a hydraulic control valve, which is operated to control the lifting of the turning cylinder under the turning board, and the turning cylinder drives the triangular arm and the pull rod to lift, and the triangular arm amplifies the lifting stroke of the turning cylinder during the lifting process. Finally, it drives the flipping springboard to lift.