Hydraulic control system for a hydraulic drive of a transfer vehicle

Abstract

The application discloses a hydraulic drive device of a transfer trolley and a hydraulic control system thereof, and relates to the field of transfer trolleys, which comprises a trolley frame, support flanges are arranged at the bottom of the two ends of two transfer trolley bottom beam frames in the trolley frame, drive wheel supports are fixed on the support flanges through bolts, drive wheels are connected to the drive wheel supports, a hydraulic oil tank and a control box are arranged on the transfer trolley bottom beam frames, and hydraulic control components are arranged in the control box, which has the beneficial effects that the application simplifies mechanical structure, reduces cost and operation difficulty, a low-speed large-torque motor is directly connected to the drive wheels, the complicated structure of a gearbox and a bridge combination is cancelled, a gear shifting device mechanism is not needed, cost is reduced, efficiency is improved, the speed and forward and backward movement of the trolley are adjusted through an electronic rocker, a double-pump double-motor or four-pump four-motor independent closed system is adopted, and the trolley is easy to move in a straight line, efficiency is improved, and control difficulty is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of transfer car, in particular to a transfer car hydrostatic drive device and a hydraulic control system thereof. BACKGROUND

[0002] The gantry type engineering transfer car is one of important equipment for realizing centralized overhaul in large processing plant. At present, the engineering transfer vehicle adopting hydrostatic drive is the bridge type structure of hydraulic motor driving gearbox, which has complex design structure, high cost, inconvenient maintenance, and is not easy to realize remote control operation and unmanned driving. Or, the motor directly drives the driving wheel, and the motor adopts high-speed motor plus speed reducer scheme, which has high cost, and the engineering transfer car is not easy to realize remote control and unmanned control. SUMMARY

[0003] The present application aims to provide a transfer car hydrostatic drive device and a hydraulic control system thereof to solve the problems in the background.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a transfer car hydrostatic drive device, comprising a transport car frame, the transport car frame comprising a pair of transfer car bottom beam frames at the bottom, a transfer car gantry support being coupled between the two transfer car bottom beam frames, support flanges being arranged at the bottom of both ends of the transfer car bottom beam frame, drive wheel supports being fixed on the support flanges by bolts, drive wheels being connected to the drive wheel supports, one side drive wheel being a first drive wheel, the other side drive wheel being a second drive wheel, one end of the rotating shaft connected with the first drive wheel being in transmission connection with the output shaft of the first hydraulic motor, the first hydraulic motor being fixed on the corresponding drive wheel support by bolts, one end of the rotating shaft of the second drive wheel being in transmission connection with the output shaft of the second hydraulic motor, the second hydraulic motor being fixed on the corresponding drive wheel support by bolts, a hydraulic oil tank and a control box being arranged on the transfer car bottom beam frame, a hydraulic control assembly being arranged in the control box, the hydraulic control assembly comprising a controller, an engine, an electric proportional closed double pump, an oil supplementing gear pump, a flushing valve group and a cooler.

[0005] Preferably, the hydraulic oil tank is provided with a liquid level switch, an air filter, a drain ball valve and a temperature sensor, and one side of the hydraulic oil tank is provided with a liquid level gauge.

[0006] Preferably, the first hydraulic motor and the second hydraulic motor are both low-speed large-torque motors, and a rotating speed sensor is arranged on each of the first hydraulic motor and the second hydraulic motor.

[0007] The hydraulic control system of the hydraulic drive device of the transfer trolley as described above, the hydraulic control assembly controls the first hydraulic motor and the second hydraulic motor connected with the first driving wheel and the second driving wheel, the electric proportional closed double pump is driven by the engine, the first proportional valve in the electric proportional closed double pump is connected with one access end of the first hydraulic motor through the hydraulic oil pipe, the second proportional valve in the electric proportional closed double pump is connected with the other access end of the first hydraulic motor through the hydraulic oil pipe, the third proportional valve in the electric proportional closed double pump is connected with one access end of the second hydraulic motor through the hydraulic oil pipe, and the fourth proportional valve in the electric proportional closed double pump is connected with the other access end of the second hydraulic motor through the hydraulic oil pipe.

[0008] Preferably, the oil paths of the electric proportional closed double pump output to the first hydraulic motor and the second hydraulic motor are each provided with a flushing valve group, the oil outlet end of the flushing valve group is connected with the cooler through the oil guide pipe, and the cooler is connected with the oil return filter provided on the hydraulic oil tank through the oil guide pipe.

[0009] Preferably, the hydraulic oil tank is internally provided with an oil suction filter, the oil suction filter is connected with the oil supplementing gear pump through the hydraulic oil pipe, and the oil supplementing gear pump is connected into the oil path of the electric proportional closed double pump through the oil guide pipe.

[0010] Preferably, the oil supplementing gear pump is provided with the high-pressure filter valve and the first electromagnetic valve in the middle of the oil path of the electric proportional closed double pump, the oil path between the oil supplementing gear pump and the high-pressure filter valve is provided with the one-way valve, and the oil paths connected with both ends of the first electromagnetic valve are connected with the safety valve in parallel.

[0011] Preferably, the oil paths connected with the first hydraulic motor and the second hydraulic motor are connected with the pilot oil path in parallel between the high-pressure filter valve, and the second electromagnetic valve is arranged in the pilot oil path.

[0012] According to the hydraulic control system of the hydraulic drive device of the transfer trolley as described above, the following steps are included:

[0013] Step one: the transport vehicle advances, retreats operation: by controlling the engine starts, then the remote control on the operation throttle knob set the engine speed and display real-time speed on the display, the engine directly drives the electric proportional closed double pump rotation; The operation of the remote control forward rocker gives the controller instructions, the controller gives the first proportional valve and the third proportional valve of the electric proportional closed double pump corresponding analog signal according to the change of the rocker, the angle of the swash plate of the electric proportional closed double pump changes, and feedback to the controller, forming a control small closed loop, the output flow of the electric proportional closed double pump drives the first hydraulic motor and the second hydraulic motor to rotate clockwise, the vehicle advances, the speed of the vehicle advancing and the change of the rocker correspond; The operation of the remote control reverse rocker gives the controller instructions, the controller gives the second proportional valve and the fourth proportional valve of the electric proportional closed double pump corresponding analog signal according to the change of the rocker, the angle of the swash plate of the electric proportional closed double pump changes, and feedback to the controller, forming a control small closed loop, so that the output flow of the electric proportional closed double pump drives the first hydraulic motor and the second hydraulic motor to rotate counterclockwise, the vehicle retreats, the speed of the vehicle advancing and the change of the rocker correspond; The first hydraulic motor and the second hydraulic motor are each provided with a speed sensor for real-time detection and feedback of the motor output speed to the controller, forming a closed hydraulic system large closed loop control; According to the required speed, change the inclination angle of the rocker, so as to change the size of the input proportional valve analog signal, realize the infinitely adjustable motor speed, so as to adjust the speed of the vehicle advancing and retreating;

[0014] Step two: cooling of the oil circuit system: the hot oil in the closed system is continuously discharged to the hydraulic oil tank through the flushing valve group, and is supplemented with new hydraulic oil filtered, cooled and heat dissipated by the oil supplement gear pump; The cooler continuously cools the circulating hot oil of the system, keeping the oil temperature of the circulating system within the appropriate working temperature range; The oil suction filter, high pressure filter valve and oil return filter fully filter and clean the oil in the system, ensuring that the cleanliness of the system oil meets the NAS1638-8 level requirement;

[0015] Step three: switching of the walking mode: selecting the working mode and the walking mode on the remote control, controlling the first hydraulic motor and the second hydraulic motor between full displacement and half displacement through external pilot oil circuit control, the second solenoid valve control valve solenoid is powered on and powered off to switch, changing the working mode and walking mode speed of the vehicle.

[0016] Technical effects and advantages of the present application:

[0017] 1. The present application simplifies the mechanical structure, reduces the cost and the operation difficulty: the low-speed large-torque motor directly drives the driving wheel, the complex structure of the gearbox and the bridge combination is cancelled, the gear shifting device mechanism is not needed, the cost is reduced, and the efficiency is improved The speed and the forward and backward adjustment are realized by the electronic rocker;

[0018] 2. The application adopts a double-pump double-motor or four-pump four-motor independent closed system, which is easy to realize straight walking of the vehicle, improve efficiency and reduce control difficulty;

[0019] 3. The application adopts an electric proportional control variable pump, which is convenient for electric control, realizes adjustment of vehicle speed and forward and backward movement through an electronic joystick, is easy to realize remote control or unmanned driving, and reduces working strength and difficulty of the operator. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a perspective view of the application.

[0021] Figure 2 It is a front view of the structure of the application.

[0022] Figure 3 It is a side view of the structure of the application.

[0023] Figure 4 It is a principle diagram of the hydrostatic drive system of the application.

[0024] Figure 5 It is a hydrostatic control flow chart of the application.

[0025] In the figure: 1, engine; 2, electric proportional closed double pump; 201, first proportional valve; 202, second proportional valve; 203, third proportional valve; 204, fourth proportional valve; 3, oil supplement gear pump; 301, second electromagnetic valve; 4, check valve; 5, high-pressure filter valve; 6, first electromagnetic valve; 7, safety valve; 8, flushing valve group; 9, first hydraulic motor; 901, second hydraulic motor; 10, cooler; 11, liquid level switch; 12, oil return filter; 13, air filter; 14, oil discharge ball valve; 15, oil suction filter; 16, temperature sensor; 17, hydraulic oil tank; 18, first drive wheel; 1801, second drive wheel; 19, transfer car bottom beam frame; 1901, transfer car gantry support; 20, support flange; 21, drive wheel support; 22, control box. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0027] The application provides a transfer car hydrostatic drive device as shown in Figures 1-5 , which comprises a transport car frame, and is combined with Figure 1 and Figure 3As shown, the transport vehicle frame includes a pair of bottom transfer car bottom beam frames 19, two transfer car bottom beam frames 19 are connected with transfer car gantry supports 1901, the bottom of both ends of the transfer car bottom beam frame 19 is provided with a support flange 20, the support flange 20 is fixed with a drive wheel support 21 through bolts, the drive wheel support 21 is connected with a drive wheel, one side of the drive wheel is a first drive wheel 18, the other side of the drive wheel is a second drive wheel 1801, the output shaft of the first hydraulic motor 9 is drivingly connected to one end of the rotating shaft of the first drive wheel 18, the first hydraulic motor 9 is fixed on the corresponding drive wheel support 21 by bolts, the first drive wheel 18 is driven by the first hydraulic motor 9, the output shaft of the second hydraulic motor 901 is drivingly connected to one end of the rotating shaft of the second drive wheel 1801, the second hydraulic motor 901 is fixed on the corresponding drive wheel support 21 by bolts, the second drive wheel 1801 is driven by the second hydraulic motor 901, the transfer car bottom beam frame 19 is provided with a hydraulic oil tank 17 and a control box 22, the control box 22 is internally provided with a hydraulic control assembly, the hydraulic control assembly includes a controller, an engine 1, an electric proportional closed double pump 2, an oil supplementing gear pump 3, a flushing valve group 8 and a cooler 10, the hydraulic oil tank 17 is provided with a liquid level switch 11, a drain ball valve 14 for use in combination with the hydraulic oil tank 17 to supplement hydraulic oil, the hydraulic oil tank 17 is provided with an air filter 13 for filtering air entering the inside of the hydraulic oil tank 17, a temperature sensor 16 for detecting the temperature of the oil in the inside of the hydraulic oil tank 17, and a liquid level gauge on one side of the hydraulic oil tank 17 for detecting the remaining amount of hydraulic oil in the inside of the hydraulic oil tank 17.

[0028] The working operation of the hydraulic control system is as follows:

[0029] The forward and reverse operation of the first hydraulic motor 9 and the second hydraulic motor 901: Figure 4 And Figure 5As shown, the electric proportional closed double pump 2 is driven by the engine 1, the first proportional valve 201 in the electric proportional closed double pump 2 is connected with one access end of the first hydraulic motor 9 through a hydraulic oil pipe, the second proportional valve 202 in the electric proportional closed double pump 2 is connected with the other access end of the first hydraulic motor 9 through a hydraulic oil pipe, the third proportional valve 203 in the electric proportional closed double pump 2 is connected with one access end of the second hydraulic motor 901 through a hydraulic oil pipe, and the fourth proportional valve 204 in the electric proportional closed double pump 2 is connected with the other access end of the second hydraulic motor 901 through a hydraulic oil pipe. By controlling the engine 1 to start, then setting the rotating speed of the engine 1 by the operation of the throttle knob on the remote controller (the remote controller is cooperated with the controller inside the control box 22 through wireless signal, and the remote controller is equipped with the throttle knob, the rocker, the display screen and other basic components, which is a common control technology means of the remote controller), and displaying the real-time rotating speed on the display screen, the engine 1 directly drives the electric proportional closed double pump 2 to rotate; the forward rocker of the remote controller sends an instruction to the controller, the controller inputs corresponding analog signals to the first proportional valve 201 and the third proportional valve 203 of the electric proportional closed double pump 2 according to the change of the rocker, the swash plate angle of the electric proportional closed double pump 2 changes, and the controller is fed back at the same time, a control small closed loop is formed, the output flow of the electric proportional closed double pump 2 drives the first hydraulic motor 9 and the second hydraulic motor 901 to rotate clockwise, the vehicle moves forward, and the speed of the vehicle moving forward corresponds to the change of the rocker; the backward rocker of the remote controller sends an instruction to the controller, the controller inputs corresponding analog signals to the second proportional valve 202 and the fourth proportional valve 204 in the electric proportional closed double pump 2 according to the change of the rocker, the swash plate angle of the electric proportional closed double pump 2 changes, and the controller is fed back at the same time, a control small closed loop is formed, so that the output flow of the electric proportional closed double pump 2 drives the first hydraulic motor 9 and the second hydraulic motor 901 to rotate counterclockwise, the vehicle moves backward, and the speed of the vehicle moving forward corresponds to the change of the rocker; the rotating speed sensor on the first hydraulic motor 9 and the second hydraulic motor 901 detects and feeds back the output rotating speed of the motor in real time, and feeds back to the controller, forming a large closed loop control of the closed hydrostatic system; according to the required speed, the inclination angle of the rocker is changed, so that the size of the input proportional valve analog signal is changed, the motor rotating speed is adjusted steplessly, and the speed of the vehicle moving forward or backward is adjusted.

[0030] Cooling of the oil circuit system: as Figure 4As shown, the oil line of the electric proportional closed double pump 2 output to the first hydraulic motor 9 and the second hydraulic motor 901 is provided with a flushing valve group 8, the oil outlet end of the flushing valve group 8 is connected with the cooler 10 through an oil guide pipe, the cooler 10 is connected with the oil return filter 12 provided on the hydraulic oil tank 17 through an oil guide pipe, the inside of the hydraulic oil tank 17 is provided with an oil suction filter 15, the oil suction filter 15 is connected with the oil supplementing gear pump 3 through a hydraulic oil pipe, and the oil supplementing gear pump 3 is connected into the oil line of the electric proportional closed double pump 2 through an oil guide pipe, the oil supplementing gear pump 3 is provided with the high-pressure filter valve 5 and the first electromagnetic valve 6 in the middle of the oil line of the electric proportional closed double pump 2, the oil line between the oil supplementing gear pump 3 and the high-pressure filter valve 5 is provided with the one-way valve 4, and the oil line connected with the two ends of the first electromagnetic valve 6 is connected with the safety valve 7 in parallel. The hot oil in the closed system is continuously discharged to the hydraulic oil tank 17 through the flushing valve group 8, and the oil supplementing gear pump 3 supplements the new hydraulic oil filtered, cooled and radiated, so that the temperature of the hydraulic oil of the closed system meets the working requirements; the cooler 10 continuously cools the hot oil circulating in the system, so that the oil temperature of the circulating system is kept in the appropriate working temperature range; the oil suction filter 15, the high-pressure filter valve 5 and the oil return filter 12 fully filter the oil in the system, so that the cleanliness of the oil in the system meets the NAS1638-8 level requirements, the machine failure rate is reduced, and the working life of the components is prolonged.

[0031] Switching of the walking mode: the oil line connected with the first hydraulic motor 9 and the second hydraulic motor 901 is connected with the pilot oil line in parallel, the pilot oil line is provided with the second electromagnetic valve 301, the working mode and the walking mode are selected through the remote controller, the second electromagnetic valve 301 is controlled through the external pilot oil line, the second electromagnetic valve 301 controls the on and off of the valve electromagnet, so that the first hydraulic motor 9 and the second hydraulic motor 901 are switched between the full displacement and the half displacement, and the working mode and the walking mode speed of the vehicle are changed.

[0032] Finally, it should be noted that: the above is only the preferred embodiment of the present application, and is not used to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application, should be included in the protection scope of the present application.

Claims

1. A hydrostatic drive device for a transport vehicle, comprising a transport vehicle frame, characterized in that: The transport vehicle frame comprises a pair of bottom beams (19) of the transport vehicle, a transport vehicle gantry bracket (1901) is connected between the two bottom beams (19), support flanges (20) are provided at the bottom of both ends of the transport vehicle bottom beam (19), a driving wheel bracket (21) is fixed to the support flange (20) by bolts, a driving wheel is connected to the driving wheel bracket (21), the driving wheel on one side is a first driving wheel (18), and the driving wheel on the other side is a second driving wheel (1801), one end of the rotating shaft connected to the first driving wheel (18) is connected to the output shaft of the first hydraulic motor (9), and the first hydraulic motor (9) is connected to the first hydraulic motor (9). The motor (9) is fixed to the corresponding drive wheel bracket (21) by bolts, one end of the rotating shaft of the second drive wheel (1801) is connected to the output shaft of the second hydraulic motor (901) by transmission, and the second hydraulic motor (901) is fixed to the corresponding drive wheel bracket (21) by bolts. A hydraulic oil tank (17) and a control box (22) are provided on the bottom beam frame (19) of the transfer vehicle. A hydraulic control component is assembled inside the control box (22). The hydraulic control component includes a controller, an engine (1), an electric proportional closed double pump (2), an oil replenishing gear pump (3), a flushing valve group (8) and a cooler (10); The hydraulic control component controls the first hydraulic motor (9) and the second hydraulic motor (901) connected to the first driving wheel (18) and the second driving wheel (1801); the electric proportional closed double pump (2) is driven by the engine (1); the first proportional valve (201) in the electric proportional closed double pump (2) is connected to one access end of the first hydraulic motor (9) through a hydraulic oil pipe; the second proportional valve (202) in the electric proportional closed double pump (2) is connected to the other access end of the first hydraulic motor (9) through a hydraulic oil pipe; the third proportional valve (203) in the electric proportional closed double pump (2) is connected to one access end of the second hydraulic motor (901) through a hydraulic oil pipe; and the fourth proportional valve (204) in the electric proportional closed double pump (2) is connected to the other access end of the second hydraulic motor (901) through a hydraulic oil pipe; A flushing valve group (8) is provided in the oil circuit from the electric proportional closed double pump (2) to the first hydraulic motor (9) and the second hydraulic motor (901), the oil outlet of the flushing valve group (8) is connected to the cooler (10) via an oil guide pipe, and the cooler (10) is connected to the return oil filter (12) provided on the hydraulic oil tank (17) via the oil guide pipe; An oil suction filter (15) is provided inside the hydraulic oil tank (17), and the oil suction filter (15) is connected to the oil replenishment gear pump (3) through a hydraulic oil pipe, and the oil replenishment gear pump (3) is connected to the oil circuit of the electric proportional closed double pump (2) through an oil guide pipe; A high-pressure filter valve (5) and a first solenoid valve (6) are provided in the middle of the oil circuit connecting the oil-supply gear pump (3) to the electric proportional closed double pump (2); a one-way valve (4) is provided in the oil circuit between the oil-supply gear pump (3) and the high-pressure filter valve (5); and a safety valve (7) is connected in parallel with the oil circuit connected to both ends of the first solenoid valve (6); A pilot oil circuit is connected in parallel between the oil circuits connected to the first hydraulic motor (9) and the second hydraulic motor (901) and the high-pressure filter valve (5), and a second solenoid valve (301) is provided in the pilot oil circuit.

2. The hydrostatic drive device for a transfer vehicle according to claim 1, characterized in that: The hydraulic oil tank (17) is equipped with a liquid level switch (11), an air filter (13), an oil drain ball valve (14) and a temperature sensor (16). A liquid level gauge is provided on one side of the hydraulic oil tank (17).

3. The hydrostatic drive device for a transfer vehicle according to claim 1, characterized in that: The first hydraulic motor (9) and the second hydraulic motor (901) are both low-speed, high-torque motors, and rotation speed sensors are installed on the first hydraulic motor (9) and the second hydraulic motor (901).

4. The hydraulic control method of the hydrostatic drive device of a transfer vehicle according to any one of claims 1 to 3, characterized in that: The following steps are involved: Step 1: Forward and reverse operation of the transfer vehicle: Start the engine (1) by controlling the throttle knob on the remote control to set the speed of the engine (1) and display the real-time speed on the display screen. The engine (1) directly drives the electric proportional closed double pump (2) to rotate; The forward rocker of the remote control is operated to send a command to the controller. The controller inputs corresponding analog signals to the first proportional valve (201) and the third proportional valve (203) of the electric proportional closed double pump (2) according to the change of the rocker. The swash plate angle of the electric proportional closed double pump (2) changes and is fed back to the controller at the same time to form a small control closed loop. The output flow of the electric proportional closed double pump (2) drives the first hydraulic motor (9) and the second hydraulic motor (901) to rotate clockwise, and the vehicle moves forward. The forward speed of the vehicle corresponds to the change of the rocker. The backward rocker of the remote control is operated to send a command to the controller. The controller inputs corresponding analog signals to the second proportional valve (202) and the fourth proportional valve (204) of the electric proportional closed double pump (2) according to the change of the rocker. The corresponding analog signal changes the swash plate angle of the electric proportional closed double pump (2) and is fed back to the controller at the same time, forming a small closed loop of control, so that the electric proportional closed double pump (2) outputs flow to drive the first hydraulic motor (9) and the second hydraulic motor (901) to rotate counterclockwise, and the vehicle moves backward. The forward speed of the vehicle corresponds to the change of the rocker; the first hydraulic motor (9) and the second hydraulic motor (901) are both equipped with speed sensors to detect and feedback the output speed of the motor in real time, and feed it back to the controller, forming a large closed loop control of the closed hydrostatic system; according to the required speed, the tilt angle of the rocker is changed, thereby changing the size of the analog signal input to the proportional valve, realizing stepless adjustment of the motor speed, thereby adjusting the forward and backward speed of the vehicle; Step 2: Cooling of the oil system: The hot oil in the closed system is continuously discharged to the hydraulic oil tank (17) through the flushing valve group (8), and the closed system is replenished with new hydraulic oil that has been filtered, cooled and dissipated through the oil replenishment gear pump (3); the cooler (10) continuously cools the hot oil circulating in the system to keep the oil temperature of the circulating system within the appropriate working temperature range; the oil suction filter (15), the high-pressure filter valve (5) and the return oil filter (12) fully filter and clean the oil in the system to ensure that the cleanliness of the system oil meets the NAS1638-8 level requirements; Step 3: Switching between forward and backward modes: Select the working mode and the forward and backward mode on the remote controller. Through the external pilot oil circuit control, the second solenoid valve (301) controls the switching of the valve electromagnet between power on and power off, so that the first hydraulic motor (9) and the second hydraulic motor (901) are switched between full displacement and half displacement, thereby changing the working mode and the forward and backward mode speed of the vehicle.

Images