CN214775869U

CN214775869U - Hydraulic flat car

Info

Publication number: CN214775869U
Application number: CN202121382738.0U
Authority: CN
Inventors: 孙亚斌
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-06-21
Filing date: 2021-06-21
Publication date: 2021-11-19
Anticipated expiration: 2031-06-21

Abstract

The utility model relates to a flatbed field specifically discloses a hydraulic flatbed, the flatbed includes the automobile body, installs first drive wheel part, second drive wheel part, afterbody support wheel part and well accuse module on the automobile body, its characterized in that, second drive wheel part is located between first drive wheel part and afterbody support wheel part; the first drive wheel assembly comprises a first hydraulic motor; the second driving wheel component comprises a hydraulic oil cylinder and a second hydraulic motor, and the second hydraulic motor is connected with the vehicle body through the hydraulic oil cylinder; the central control module controls the first hydraulic motor, the second hydraulic motor and the hydraulic oil cylinder to be opened and closed, when the flat car is in no-load, the oil supply of the second hydraulic motor is cut off, so that the oil supply quantity of the first hydraulic motor is increased, the hydraulic oil cylinder is contracted, and the purposes of increasing the speed of the car, reducing the abrasion of tires and reducing the running resistance are achieved.

Description

Hydraulic flat car

Technical Field

The utility model relates to a flatbed field especially relates to a hydraulic pressure flatbed.

Background

Most of the flat cars in the market are hydraulically driven, a main oil pump is driven by a diesel engine to provide power for the whole hydraulic system, and then a hydraulic motor on a driving wheel is driven to move the flat cars. The speed regulation of the flat car is to regulate the rotating speed of the hydraulic motor by regulating the rotating speed of the diesel engine and changing the flow rate of the main oil pump to change the oil feeding amount to the hydraulic motor on each wheel, which has a problem that the speed regulation range is limited, the speed of the flat car is not greatly changed during heavy load and no load, the air load speed is too slow during long-distance transportation to influence the working efficiency, and meanwhile, in order to increase the speed, the diesel engine must be operated at high speed, so the operation efficiency is very low and energy is wasted.

SUMMERY OF THE UTILITY MODEL

The utility model provides a hydraulic pressure flatbed to solve above-mentioned technical problem.

In order to achieve the purpose, the utility model provides a hydraulic flat car, which comprises a car body, a first driving wheel component, a second driving wheel component, a tail supporting wheel component and a central control module, wherein the first driving wheel component, the second driving wheel component, the tail supporting wheel component and the central control module are arranged on the car body;

the first drive wheel assembly comprises a first hydraulic motor; the second driving wheel component comprises a hydraulic oil cylinder and a second hydraulic motor, and the second hydraulic motor is connected with the vehicle body through the hydraulic oil cylinder;

the central control module controls the first hydraulic motor, the second hydraulic motor and the hydraulic oil cylinder to be opened and closed, the hydraulic oil cylinder drives the second driving wheel component to lift and fall through stretching, the second hydraulic motor stops rotating when the second driving wheel component is lifted, and the second hydraulic motor operates when the second driving wheel component falls.

Further, a weighing sensor is mounted at the bottom of the vehicle body and used for measuring the load of the flat car, and the central control module group receives signals of the weighing sensor;

the central control module judges whether the load of the flat car is greater than a threshold value; if the current value is greater than the threshold value, controlling the hydraulic oil cylinder to contract, and simultaneously controlling the second hydraulic motor to stop rotating; if the hydraulic oil pressure is smaller than the threshold value, the hydraulic oil cylinder is controlled to extend out, and meanwhile the second hydraulic motor is controlled to operate.

Furthermore, the hydraulic flat car further comprises a hydraulic oil pump, the hydraulic oil pump is connected with the first hydraulic motor, the second hydraulic motor and the hydraulic oil cylinder through a hydraulic oil path, the hydraulic oil path is connected with an electromagnetic valve group, the electromagnetic valve group is connected with the central control module, and the central control module controls the rotation of the first hydraulic motor and the second hydraulic motor and the extension of the hydraulic oil cylinder through the electromagnetic valve group.

The electromagnetic valve group comprises a two-position four-way reversing valve, a front-end two-position two-way reversing valve and a middle two-position two-way reversing valve, the two-position four-way reversing valve controls the extension and retraction of the hydraulic oil cylinder, the front-end two-position two-way reversing valve controls the oil supply of the first hydraulic motor and the second hydraulic motor, and the middle two-position two-way reversing valve controls the oil supply of the second hydraulic motor.

Furthermore, the electromagnetic valve group comprises a two-position four-way reversing valve, a three-position four-way reversing valve and a two-position three-way reversing valve, the two-position four-way reversing valve controls the extension and retraction of the hydraulic oil cylinder, the three-position four-way reversing valve controls the oil supply and the rotation direction of the first hydraulic motor and the second hydraulic motor, and the two-position three-way reversing valve controls the oil supply of the second hydraulic motor.

The flat car further comprises a driving position, a steering mechanism and a manual control device, wherein the steering mechanism is connected with the first driving wheel component and is used for adjusting the steering of the flat car; and the manual control device is connected with the central control module and is used for manually controlling the electromagnetic valve group.

Further, the flatbed still includes ultrasonic sensor, installs the front end of automobile body, ultrasonic sensor transmits the signal of telecommunication for well accuse module is used for detecting the barrier in flatbed the place ahead.

The system is further characterized in that the central control module comprises a signal receiving module, a judging module, a control module and an obstacle avoidance module;

the signal receiving module is used for receiving signals of the weighing sensor and the ultrasonic sensor and is also used for receiving signals of the electromagnetic valve group;

the judging module is used for judging whether the load of the flat car is greater than a threshold value;

the control module is used for controlling the work of the electromagnetic valve group;

the obstacle avoidance module detects a front obstacle by processing a signal of the ultrasonic sensor and analyzes the distance of the obstacle.

Further, the hydraulic flat car further comprises:

the central control module receives signals of the ultrasonic sensor;

whether an obstacle exists in front of the flat car or not and the distance between the obstacles are analyzed, if the distance is smaller than a threshold value, the electromagnetic valve group is controlled to cut off the oil supply of the main oil way of the hydraulic motor, and if no obstacle exists in front or the distance between the obstacles is larger than a threshold value, the electromagnetic valve group is controlled to connect the oil supply of the main oil way of the hydraulic motor.

Furthermore, a pair of auxiliary supporting wheels is arranged at the bottom of the vehicle body and positioned between the first driving wheel component and the second driving wheel component, the auxiliary supporting wheels are connected with the vehicle body through a driven wheel hydraulic oil cylinder, and the central control module controls the extension of the driven wheel hydraulic oil cylinder.

The beneficial effects of the above technical scheme are that: when the flat car is loaded, the flat car is driven by four wheels, so that the driving capability and the bearing capability of the flat car are improved; when the flat car is unloaded, the central control module controls the hydraulic oil cylinder to contract by utilizing the function of free extension of the hydraulic oil cylinder, so that the second driving wheel component in the middle of the car body is lifted, wheels in the middle of the car body are separated from the ground, and only a pair of driving wheels and a pair of driven wheels are left to work. Meanwhile, the central control module controls the electromagnetic valve group to close oil supply of the lifted hydraulic motor (second hydraulic motor) so that the flat car is changed into a two-drive working mode, oil from the hydraulic oil pump is only supplied to the hydraulic motors of the pair of driving wheels, the oil supply amount of the hydraulic motor is increased in a multiple mode, the speed of the flat car is increased in a multiple mode, the use effect of the flat car in no-load can be greatly improved, meanwhile, wheels in the middle of the car body are lifted up and do not participate in working, the abrasion of tires can be reduced, the friction between the flat car and the ground is reduced, and the working efficiency is improved. The scheme is equivalent to that the automobile is hung on a high-speed gear, so that the rotation degree of the engine can be reduced, and the oil consumption is reduced.

Drawings

Fig. 1 is a structural diagram of a flat car according to a first embodiment of the present invention;

fig. 2 is a bottom structure view of a flat car according to a first embodiment of the present invention;

fig. 3 is a structural diagram of a second driving wheel component according to a first embodiment of the present invention;

fig. 4 is a hydraulic oil circuit diagram according to a first embodiment of the present invention;

fig. 5 is a structural diagram of a central control module according to a first embodiment of the present invention;

fig. 6 is a flowchart of a first embodiment of the present invention;

fig. 7 is a hydraulic oil circuit diagram according to a second embodiment of the present invention;

fig. 8 is a structural view of a flat car according to a third embodiment of the present invention;

fig. 9 is a structural view of a steering mechanism according to a third embodiment of the present invention.

Detailed Description

The technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The first embodiment is as follows:

referring to fig. 1 and 2, the present embodiment provides a flat car for rail transportation, which includes: the driving device comprises a vehicle body 1, a first driving wheel component 5, a second driving wheel component 10, a tail supporting wheel component 16 and a central control module 8, wherein the first driving wheel component 5, the second driving wheel component 10, the tail supporting wheel component 16 and the central control module 8 are arranged on the vehicle body 1, and the second driving wheel component 10 is arranged between the first driving wheel component 5 and the tail supporting wheel component 16;

the first driving wheel unit 5 comprises a first hydraulic motor 17; the second driving wheel component 10 comprises a hydraulic oil cylinder 11 and a second hydraulic motor 18, and the second hydraulic motor 18 is connected with the vehicle body 1 through the hydraulic oil cylinder 11;

the central control module 8 controls the first hydraulic motor 17, the second hydraulic motor 18 and the hydraulic cylinder 11 to be opened and closed, the hydraulic cylinder 11 drives the second driving wheel component 10 to be lifted and lowered through stretching, the second hydraulic motor 18 stops rotating when the second driving wheel component 10 is lifted, and the second hydraulic motor 18 runs when the second driving wheel component 10 is lowered.

The flat car further comprises an engine 2, a generator 3, a hydraulic oil pump 4, an ultrasonic sensor 6, a battery 7, a central control module 8, a driven wheel hydraulic oil cylinder 9, a weighing sensor 12, an oil tank 13, an oil groove 14, an electromagnetic valve group 15 and an oil pipe (not shown in the figure).

The flat car body 1 surface lays the flat steel sheet in order to increase the wearing resistance in surface, for reducing self weight, and automobile body 1 is inside to adopt steel section bar to make. The vehicle body 1 is divided into a vehicle head part and a bearing part, the two parts are separated by a steel plate, and the vehicle head part is provided with an engine 2, a generator 3, a hydraulic oil pump 4, a storage battery 7, a central control module 8 and an ultrasonic sensor 6; the engine 2 is a diesel engine, the rotating speed of the engine is controlled by a central control module 8, the output end of the engine 2 is connected with an input shaft of a hydraulic oil pump 4, and the hydraulic oil pump 4 provides hydraulic oil for the whole hydraulic system; the output end of the engine 2 is connected with the input shaft of the generator 3 through a belt, when the engine 2 works normally, the generator 3 is driven to generate electricity, and electric energy is stored in the storage battery 7; one end of the battery 7 is connected with a starter of the engine 2 to supply power to the starter, and the other end of the battery is connected with the central control module 8 to supply power to the central control module 8; the ultrasonic sensor 6 is arranged at the foremost end of the locomotive, and the central control module 8 receives signals of the ultrasonic sensor 6 and the weighing sensor 12 and controls the rotating speed of the engine 2 and the work of the electromagnetic valve group 15.

The ultrasonic sensor 6 adopts an HC-SR04 type sensor, the emitting end of the sensor can send 8 40Hz square waves after being triggered, a timer is started at the same time, the ultrasonic sensor stops timing when the receiving end receives echoes, and the central control module can calculate the distance according to the detected time interval to determine whether an obstacle exists in front of the flat car and make a corresponding response.

Flatbed transports goods along the trapped orbit, and 4 groups rail wheel are installed to the automobile body below, are in proper order from the front to the back: the driving device comprises a first driving wheel, a middle driven wheel, a second driving wheel and a tail driven wheel;

as shown in fig. 3, the structure of the second driving wheel component 10 includes a rail wheel 31, a connecting seat 32, a second hydraulic motor 18, and a hydraulic cylinder 11, the hydraulic cylinder 11 is fixed on the vehicle body 1 by bolts, the hydraulic cylinder 11 has two oil holes, the hydraulic cylinder drives the hydraulic rod to extend and retract by the hydraulic oil, the connecting seat 32 is installed at the end of the hydraulic rod, the second hydraulic motor 18 is installed on the connecting seat 32 by bolts, the output shaft of the second hydraulic motor 18 is connected to the rail wheel 31 by a spline, and a bearing is installed in the connecting seat 32 for supporting the rail wheel 31.

The structure of the first driving wheel component 5 is similar to that of the second driving wheel component 10, and the difference lies in that a support rod is adopted for connection between the connecting seat and the vehicle body instead of a hydraulic oil cylinder, one end of the support rod is fixed on the vehicle body through a bolt, the connecting seat is installed at the other end of the support rod, and a connecting rod is installed between the left support rod and the right support rod for improving the supporting stability.

A driven wheel hydraulic oil cylinder 9 is arranged between the middle driven wheel and the vehicle body 1, the upper part of the driven wheel hydraulic oil cylinder 9 is fixed on the vehicle body 1 through a bolt, and a lower part hydraulic rod is connected with the rail wheel through a bearing; the left track wheel and the right track wheel are fixedly connected together through a connecting rod, and the supporting reliability is improved.

The tail driven wheel part 16 comprises a tail driven wheel, a support and a bearing, the bearing is installed between the tail driven wheel and the support, the weighing sensor 12 is installed between the support and the vehicle body, the weighing sensor 12 is used for detecting the load of the flat car, the weighing range is 1 ton, an anti-impact tray is additionally installed between the weighing sensor 12 and the vehicle body 1, and the flat car is prevented from generating too large impact on the sensor when the goods are loaded, so that the sensor is prevented from being damaged.

Fig. 4 shows a hydraulic oil circuit diagram, which includes an oil tank 14, a filter 41, an engine 2, a hydraulic oil pump 4, a check valve 42, an overflow valve 43, a driven wheel hydraulic cylinder 9, a hydraulic cylinder 11, a first hydraulic motor 17, a second hydraulic motor 18, and an electromagnetic valve bank 15, wherein the electromagnetic valve bank 15 includes a two-position four-way directional valve 44, a front-end two-position two-way directional valve 45, and a middle two-position two-way directional valve 46, the engine 2 drives the hydraulic oil pump 4 to pump oil from the oil tank 14, the hydraulic oil pump 4 is a one-way variable hydraulic pump, and the filter 41 is installed between the oil tank 14 and the hydraulic oil pump 4 for filtering impurities in the oil.

The pumped hydraulic oil is divided into two paths, one path of hydraulic oil acts on the hydraulic oil cylinders, flows to the two-position four-way reversing valve 44 through the check valve 42, then flows to the four hydraulic oil cylinders, and finally flows to the oil tank 14 through the two-position four-way reversing valve 44, and an overflow valve 43 is connected between the check valve 42 and the two-position four-way reversing valve 44;

the other path acts on the hydraulic motors, passes through the first two-position two-way reversing valve 45, passes through the two groups of hydraulic motors and finally flows to the oil tank 14, wherein a second two-position two-way reversing valve 46 is arranged between the second hydraulic motor 18 and the first two-position two-way reversing valve 45, and the two groups of hydraulic motors are all single-direction variable motors.

The first two-position two-way reversing valve 45 controls the on-off of the main oil path of the hydraulic motor, and the second two-position two-way reversing valve 46 controls the on-off of the second hydraulic motor 18. The working principle of the reversing valve is as follows: when the valve core reaches the required reversing position from the original position, the baffle plate at the end part of the valve core triggers the limit switch to act, an electric signal is sent to the central control module 8, the direct current motor stops rotating, and the reversing process is completed.

The check valve 42 is used for maintaining the oil pressure in the hydraulic oil cylinder when the engine 2 stops working and preventing the hydraulic oil pump 4 from being impacted by the impact on the hydraulic oil cylinder when goods are loaded;

the overflow valve 43 has the function that when the flat car is static, the first two-position two-way reversing valve 45 is closed, and hydraulic oil is decompressed through the overflow valve 43;

the two-position four-way reversing valve 44 is used for changing the flow direction of an oil way and achieving the function of extending and retracting the hydraulic oil cylinder.

As shown in fig. 5, which is a structural diagram of the central control module 8 according to the first embodiment, the central control module 8 includes a signal receiving module 51, a determining module 52, a control module 53, and an obstacle avoidance module 54; the signal receiving module 51 is configured to receive signals of the weighing sensor 12 and the ultrasonic sensor 6, and is also configured to receive signals of each electromagnetic valve and receive a remote command; the judging module 52 is configured to judge whether the load of the flat car is greater than a threshold; the control module 53 is used for controlling the rotating speed of the engine 2, starting and stopping the engine 2 and working of each electromagnetic valve; the obstacle avoidance module 54 is configured to process the signal of the ultrasonic sensor 6, detect whether there is an obstacle in front of the ultrasonic sensor, and analyze the distance between the obstacles.

As shown in fig. 6, which is a flowchart of the first embodiment, after the loading of the goods on the flat car is completed, when a remote command for starting is received, the control module 53 first controls the starter to start the engine 2, then the signal receiving module 51 receives the signal from the weighing sensor 12, and the determining module 52 determines whether the load weight of the flat car is greater than a threshold; if the value is larger than the threshold value, the two-position four-way reversing valve 44 is controlled to extend out of the hydraulic rod and is connected with the oil circuit of the second hydraulic motor 18; if the hydraulic pressure is smaller than the threshold value, controlling the two-position four-way reversing valve 44 to contract the hydraulic rod and disconnecting the oil circuit of the second hydraulic motor 18; next, the control switches on the first two-position two-way selector valve 45, and the flat car advances along the track.

In the advancing process, if the obstacle avoidance module 54 detects that an obstacle exists in front of the vehicle, the obstacle distance is analyzed, the control module 53 reduces the rotating speed of the engine 2, and finally controls to close the first two-position two-way reversing valve 45, so that the condition that the flat car is suddenly braked and stopped due to the fact that the electromagnetic valve is quickly disconnected is avoided, the closing time of the first two-position two-way reversing valve 45 is prolonged, the purpose of smoothly stopping the vehicle is achieved, and the vehicle can continue to advance after the obstacle leaves. When the front of the flat car reaches the terminal, the signal receiving module 51 receives a remote command for stopping, and the control module 53 controls the flat car to decelerate and stop; the two-position, four-way reversing valve 44 is then controlled to extend out of the hydraulic stem in preparation for the next load, and finally the engine 2 is shut down.

Example two:

different from the first embodiment, the hydraulic oil circuit of the second embodiment is changed, the hydraulic motor 4 adopts a bidirectional variable motor, so that the flat car has a reversing function, and the tail part of the car body 1 is also provided with an ultrasonic sensor 6 connected to the obstacle avoidance module 54 of the central control module 8 for detecting obstacles in the tail direction of the car during reversing.

As shown in fig. 7, which is a hydraulic oil path diagram of the second embodiment, the electromagnetic valve group 15 includes a three-position four-way directional valve 71, a two-position three-way directional valve 72, and a two-position four-way directional valve 44, the main oil path of the hydraulic motor 2 is connected to the three-position four-way directional valve 71, a port P of the three-position four-way directional valve 71 is an inlet of the main oil path of the hydraulic motor, the port T is connected to an oil tank, and the port a is connected to one end of the first hydraulic motor 17; the other end of the first hydraulic motor 17 is connected in series with the port P of the two-position three-way reversing valve 72, the port B of the two-position three-way reversing valve 72 is connected in series with one end of the second hydraulic motor 18, the other end of the second hydraulic motor 18 is connected with the port B of the three-position four-way reversing valve 71, and the port a of the two-position three-way reversing valve 72 is connected with the port B of the three-position four-way reversing valve 71. When the oil path flows from the port P of the three-position four-way reversing valve 71 to the port A, the hydraulic motor rotates forwards, and when the oil path flows from the port P of the three-position four-way reversing valve 71 to the port B, the hydraulic motor rotates backwards; when the port P of the two-position three-way reversing valve 72 is communicated with the port B, the oil path flows back to the port B of the three-position four-way reversing valve 71 through the middle pressure motor 18 to drive the second hydraulic motor 18 to rotate; when the port P of the two-position three-way selector valve 72 is communicated with the port a, the oil path bypasses the second hydraulic motor 18 and directly flows back to the port B of the three-position four-way selector valve 71, the second hydraulic motor 18 does not rotate, and the hydraulic oil only drives the first hydraulic motor 17, so that the rotating speed of the first hydraulic motor 17 is rapidly increased.

In summary, in the second embodiment, the three-position four-way selector valve 71 and the two-position three-way selector valve 72 are controlled to realize the forward and reverse rotation of the hydraulic motor and to control the on/off of the second hydraulic motor 18. When the flat car arrives at the destination for loading and unloading goods, the hydraulic motor switches the steering to return the original path for backing the flat car; when the flat car is in no-load, the second hydraulic motor 18 is disconnected, and the hydraulic oil only drives the first hydraulic motor 17, so that the rotating speed of the first hydraulic motor 17 is rapidly increased, and the speed of the flat car in no-load is increased; and when the flat car is in no-load, the four hydraulic oil cylinders are contracted, two pairs of wheels in the middle of the car body 1 are lifted, the abrasion of the wheels is reduced, and the running resistance of the flat car is reduced.

Example three:

as shown in fig. 8, the third embodiment is a road-surface flatbed, which is not a track flatbed any more than the second embodiment, and the following points are different: firstly, the rail wheel is changed into a rubber wheel; secondly, a driving position and a steering mechanism are added, and the flatbed is steered through manual operation; thirdly, increasing the rotating speed of the engine and manually adjusting the rotating handle; fourthly, the function of manual control of each electromagnetic valve is added; canceling the ultrasonic sensor and the obstacle avoidance module; and sixthly, after the signal receiving module receives the remote signal, displaying the received signal on a display screen.

The third embodiment specifically includes: the hydraulic oil-saving control system comprises a vehicle body 1, an engine 2, a generator 3, a hydraulic oil pump 4, a seat 81, a steering handle 82, a screen 83, an accelerator knob 84, a steering rod 85, a steering mechanism 86, a battery 7, a central control module 8, a first driving wheel component 5, a driven wheel hydraulic oil cylinder 9, a hydraulic oil cylinder 11, a second driving wheel component 10, a weighing sensor 12, an oil tank, an oil groove, an electromagnetic valve group and an oil pipe. The difference from the second embodiment is that the wheels are all made of a combination of metal hubs and rubber tires; a seat 81 and a steering rod 85 are mounted and rotated on the vehicle body 1, one end of the steering rod 85 is connected with a steering handle 82, the other end of the steering rod 85 is connected with a steering mechanism 86, the steering mechanism 86 is driven to rotate by rotating the steering handle 82, an accelerator knob 84 is mounted at the right end of the steering handle 82, the accelerator knob 84 transmits an electric signal to the signal receiving module 51, and the central control module controls the rotating speed of the engine 2 according to the rotating angle of the accelerator knob 84; a screen 83 is arranged in the middle of the steering handle 82, the screen 83 is connected with the central control module 8, the screen 83 transmits signals to the central control module 8 to control the reversing of each electromagnetic valve in the electromagnetic valve group 15, and meanwhile, remote information received by the receiving module 51 is displayed on the screen 83; the electromagnetic valve is manually controlled by the screen 83 to change the direction, so that the forward, backward, stop, extension and retraction of the hydraulic oil cylinder and the on-off of the second driving wheel 18 of the flat car can be controlled, and when the manual control and the automatic control conflict, the manual control instruction is executed.

As shown in fig. 9, the steering mechanism includes a steering rocker arm 96, a left steering tie rod 97, a right steering tie rod 95, a left trapezoid arm 98, a right trapezoid arm 94, a connecting seat 93, a bearing 92, and a support rod 91, wherein the steering rocker arm 96 is fixedly connected to one end of the steering rod 85, one end of the left steering tie rod 97 and one end of the right steering tie rod 95 are respectively connected to the steering rocker arm 96 through hinges, the other end of the left steering tie rod 97 is connected to the left trapezoid arm 98 through a hinge, the other end of the right steering tie rod 95 is connected to the right trapezoid arm 94 through a hinge, the left trapezoid arm 98 is fixedly connected to the left connecting seat, the right trapezoid arm is fixedly connected to the right connecting seat, the bearing 92 is installed between the connecting seat 93 and the support rod 91, so that the connecting seat 93 rotates around the support rod 91, and the support rod 91 is fixed to the vehicle body 1 through a bolt; when the steering rod 85 is turned, the steering rocker arm 96 pushes the left steering tie rod 97 and the right steering tie rod 95 to move transversely, so as to drive the connecting seat 93 to rotate around the supporting rod 91, thereby realizing the steering of the wheels.

The flat car in the third embodiment is used for transporting goods on a common road surface, and a driver can manually control the flat car to steer, advance, retreat, accelerate, decelerate, stop, lift the hydraulic oil cylinder and make and break the second driving wheel by operating the flat car at a driving position; and meanwhile, the hydraulic oil cylinder can be automatically controlled to stretch and the second driving wheel can be automatically controlled to be switched on and off according to the load of the flat car.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. A hydraulic flat car comprises a car body, a first driving wheel component, a second driving wheel component, a tail supporting wheel component and a central control module, wherein the first driving wheel component, the second driving wheel component, the tail supporting wheel component and the central control module are mounted on the car body;

2. The hydraulic flat car according to claim 1, wherein a load cell is mounted at the bottom of the car body and used for measuring the load of the flat car, and the central control module group receives a signal of the load cell;

3. The hydraulic flat car according to claim 2, further comprising a hydraulic oil pump, wherein the hydraulic oil pump is connected to the first hydraulic motor, the second hydraulic motor and the hydraulic oil cylinder through a hydraulic oil path, the hydraulic oil path is connected to an electromagnetic valve bank, the electromagnetic valve bank is connected to the central control module, and the central control module controls rotation of the first hydraulic motor and the second hydraulic motor and extension and retraction of the hydraulic oil cylinder through the electromagnetic valve bank.

4. The hydraulic flat car according to claim 3, wherein the electromagnetic valve set comprises a two-position four-way directional valve, a front-end two-position two-way directional valve and a middle two-position two-way directional valve, the two-position four-way directional valve controls the extension and retraction of the hydraulic oil cylinder, the front-end two-position two-way directional valve controls the oil supply of the first hydraulic motor and the second hydraulic motor, and the middle two-position two-way directional valve controls the oil supply of the second hydraulic motor.

5. The hydraulic flat car according to claim 3, wherein the solenoid valve set comprises a two-position four-way directional valve, a three-position four-way directional valve and a two-position three-way directional valve, the two-position four-way directional valve controls the extension and retraction of the hydraulic oil cylinder, the three-position four-way directional valve controls the oil supply and rotation directions of the first hydraulic motor and the second hydraulic motor, and the two-position three-way directional valve controls the oil supply of the second hydraulic motor.

6. The hydraulic flat car according to claim 4 or 5, further comprising a driving seat, a steering mechanism, and a manual control device, wherein the steering mechanism is connected to the first driving wheel component for adjusting the steering of the flat car; and the manual control device is connected with the central control module and is used for manually controlling the electromagnetic valve group.

7. The hydraulic flat car according to claim 4 or 5, further comprising an ultrasonic sensor mounted at the front end of the car body, wherein the ultrasonic sensor transmits an electric signal to the central control module for detecting an obstacle in front of the flat car.

8. The hydraulic flat car according to claim 7, wherein the central control module comprises a signal receiving module, a judging module, a control module and an obstacle avoidance module;

9. The hydraulic flat cart according to claim 7, comprising:

the central control module receives signals of the ultrasonic sensor;

10. The hydraulic flat cart according to claim 4 or 5, wherein a pair of auxiliary support wheels are arranged at the bottom of the cart body, the auxiliary support wheels are arranged between the first driving wheel component and the second driving wheel component, the auxiliary support wheels are connected with the cart body through driven wheel hydraulic cylinders, and the central control module controls the driven wheel hydraulic cylinders to extend and retract.