CN109356895A - Land leveller front-wheel drive control system - Google Patents
Land leveller front-wheel drive control system Download PDFInfo
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- CN109356895A CN109356895A CN201811283006.9A CN201811283006A CN109356895A CN 109356895 A CN109356895 A CN 109356895A CN 201811283006 A CN201811283006 A CN 201811283006A CN 109356895 A CN109356895 A CN 109356895A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/22—Synchronisation of the movement of two or more servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Arrangement And Driving Of Transmission Devices (AREA)
Abstract
The present invention relates to land leveller front-wheel drive control systems, including two variable pump groups, two front-wheel hydraulic motors, two front-wheel control valves, controllers；Each variable pump group connect to form closed loop through a front-wheel control valve with a front-wheel hydraulic motor；It is connect for controlling the Electromagnetic Control end of flow with controller in each variable pump group；Differential control valve is connected between the A hydraulic fluid port of two front-wheel hydraulic motors, and the Electromagnetic Control end of differential control valve is connect with the controller, and when front-wheel steer, controller controls the differential control valve and to be connected between the A hydraulic fluid port of two front-wheel hydraulic motors.It is an advantage of the invention that being provided with differential control valve between the A hydraulic fluid port of two front-wheel hydraulic motors, differential and the limit idle running requirement of front-wheel are realized by control differential control valve.
Description
Technical field
The present invention relates to a kind of drivings of land leveller, more specifically to a kind of land leveller front-wheel drive control system.
Background technique
Left and right sides tire has differential requirement to land leveller under steam, for overcoming because of steering or Uneven road caused by it is left
Right two sides tire speed is poor.Left and right sides tire is avoided to lose complete machine since attachment coefficient difference causes tire unilateral side to be trackslipped again
Tractive force is removed, left and right sides is rotatably connected, plays and limits sliding function.
Existing land leveller front-wheel drive control system generally uses two motor of a pump or double pump double motor form.
One two motors of pump: the front-wheel power-assisted open type hydraulic system of two motors of a transfer tube band, transfer tube is from liquid
Pressure oil case oil suction, outlet pressure oil is directly accessed two motors in parallel after control valve, then returns to hydraulic oil container through control valve
A kind of open type hydraulic system.When land leveller arranged on left and right sides ground attaching coefficient difference is larger, transfer tube can incite somebody to action more hydraulic
Oil is output to the lesser motor of load, that is, the motor of the smaller side of attachment coefficient.Land leveller will appear front-wheel unilateral side at this time
Trackslipping makes complete machine lose tractive force, accelerates tire wear.
Double pump double motor form: the drive hydraulic system principle of the near front wheel and the drive hydraulic system principle of off-front wheel are mutually indepedent, left
The revolving speed of hydraulic motor and right hydraulic motor is that the hydraulic flow exported by respective hydraulic pump determines.Left front wheel drive hydraulic pressure system
Hydraulic pump output hydraulic pressure uninterrupted in the hydraulic pump and off-front wheel drive hydraulic system principle of system is controlled by controller.Use steering
The steering angle of sensor measurement land leveller, calculates that inwardly turned exterior angle, inside and outside wheel speed are poor, and finally calculating front-wheel or so motor needs
The hydraulic flow wanted.The revolving speed for needing to measure front-wheel or so motor simultaneously, by the revolving speed of measurement and calculated front-wheel or so horse
It compares up to revolving speed, implements the closed-loop control to front-wheel or so motor rotary speed.The differential and limit of land leveller may be implemented in the system
Idle running function, but the number of sensors used is more, and control is complicated, higher cost.
Summary of the invention
The technical problem to be solved by the present invention is to the front-wheel differential in travelling for existing land leveller and sliding problem is limited, and is mentioned
For a kind of land leveller front-wheel drive control system, that is, differential driving requirements are able to achieve, and limit idle running requirement may be implemented.
The technical scheme is that in this way: providing a kind of land leveller front wheel driven hydraulic system, it is characterised in that including
Two variable pump groups, two front-wheel hydraulic motors, two front-wheel control valves, controllers；Each variable pump group is through a front-wheel control
Valve processed connect to form closed loop with a front-wheel hydraulic motor；For controlling the Electromagnetic Control end of flow in each variable pump group
It is connect with controller；Characterized by further comprising differential control valve, the differential control valve is connected to two front-wheel hydraulic motors
A hydraulic fluid port between make to be interconnected between the A hydraulic fluid port of two front-wheel hydraulic motors or cut-off.When pavement roughness, differential control
Valve conducting processed, opens front-wheel differential function, and the hydraulic oil of two variable pump groups output passes through between the A hydraulic fluid port of front-wheel hydraulic motor
It freely distributes, realizes front-wheel differential traveling；When muddy road surface when driving, differential control valve cut-off so that two front-wheels are hydraulic
End between the A hydraulic fluid port of motor, left and right front-wheel hydraulic motor rotates synchronously, and realizes that front-wheel limits idle running.
Further, in above-mentioned land leveller front wheel driven hydraulic system, the controller is same to the output of each variable pump group
Sample controls the identical hydraulic flow that signal controls the output of two variable pump groups.
It further, further include differential control letter connected to the controller in above-mentioned land leveller front wheel driven hydraulic system
Number input unit, the differential control valve is the solenoid valve that Electromagnetic Control end is connect with the controller, the controller foundation
Differential control signal input apparatus controls the A hydraulic fluid port whether the differential control valve is connected to two front-wheel hydraulic motors.
It further, further include slippage pump in above-mentioned land leveller front wheel driven hydraulic system, the front-wheel control valve includes
Three position four-way directional control valve and two position-5 way valves, the three position four-way directional control valve have C hydraulic fluid port, D hydraulic fluid port, c hydraulic fluid port and d oil
Mouthful, C hydraulic fluid port is connected with d hydraulic fluid port when the three position four-way directional control valve is in the next, and D hydraulic fluid port is connected with c hydraulic fluid port；The 3-position 4-way
Conducting, the cut-off of D hydraulic fluid port is connected in C hydraulic fluid port with c hydraulic fluid port and d hydraulic fluid port simultaneously when reversal valve is in middle position；The three position four-way directional control valve
In it is upper when D hydraulic fluid port be connected simultaneously with c hydraulic fluid port and d hydraulic fluid port, C hydraulic fluid port ends；Two position-5 way valve has A hydraulic fluid port, B
Hydraulic fluid port, E hydraulic fluid port, F hydraulic fluid port, L hydraulic fluid port；The d hydraulic fluid port of three position four-way directional control valve is connect with the hydraulic control lower end of two position-5 way valves, and three
The c hydraulic fluid port of position and four-way reversing valve is connect with the hydraulic control upper end of two position-5 way valves and L hydraulic fluid port simultaneously；Described two five logical commutations
When valve is in the next, E hydraulic fluid port is connected with F hydraulic fluid port, and A hydraulic fluid port is connected with L hydraulic fluid port simultaneously with B hydraulic fluid port, two position-5 way valve
In it is upper when, E hydraulic fluid port is connected with A hydraulic fluid port, and F hydraulic fluid port is connected with B hydraulic fluid port, L hydraulic fluid port cut-off；Two work of each variable pump group
Hydraulic fluid port correspondence is connect with a front-wheel control valve E hydraulic fluid port and F hydraulic fluid port, and the A hydraulic fluid port and B hydraulic fluid port of each front-wheel control valve are corresponding with before
The A hydraulic fluid port of wheel hydraulic motor is connected with R hydraulic fluid port, and the D hydraulic fluid port of the front-wheel control valve is connect with slippage pump oil outlet, C hydraulic fluid port and oil
Case connection, counterbalance valve are connected between external oil sources P point and fuel tank, and the shell T oil return opening of front-wheel hydraulic motor is connected to external
Between oil sources P point and the oil inlet of counterbalance valve.
Further, in above-mentioned land leveller front wheel driven hydraulic system, each variable pump group includes variable pump, is used for
The pump control mechanism of variable pump discharge is controlled, is connect with pump control mechanism and pump control mechanism that Electromagnetic Control end is connect with the controller
Solenoid valve, Fill valve；Two oil outlets of the Fill valve are respectively corresponded to be connect with two actuator ports of the variable pump, institute
The oil outlet of the oil inlet and slippage pump of stating Fill valve connects, and the oil inlet of pump control mechanism solenoid valve and the oil outlet of slippage pump connect
It connects.
It further, further include connecting with controller for detecting level land in above-mentioned land leveller front wheel driven hydraulic system
The speed probe of machine rear wheel rotation speed, the controller according to the discharge capacity that rear wheel rotation speed controls the variable pump make front wheel rotation speed with
The rear wheel rotation speed of land leveller is equal.
It further, further include that shift signal connected to the controller is defeated in above-mentioned land leveller front wheel driven hydraulic system
Enter device and Speed Switch Valve, the Speed Switch Valve is the two-bit triplet electromagnetism that Electromagnetic Control end is connect with the controller
B hydraulic fluid port and C the hydraulic fluid port correspondence of valve, Speed Switch Valve are connect with fuel tank and slippage pump oil outlet, the B hydraulic fluid port and C of Speed Switch Valve
Hydraulic fluid port or A hydraulic fluid port select a conducting；S hydraulic fluid port of each front-wheel hydraulic motor for high tick-over discharge capacity switching control is cut with speed
The A hydraulic fluid port connection for changing valve, when land leveller gear is in high gear, the controller output electric current makes the C oil of Speed Switch Valve
Mouth is connected with A hydraulic fluid port.
It further, further include the oil outlet and oil for being connected to slippage pump in above-mentioned land leveller front wheel driven hydraulic system
Repairing overflow valve between case.
It further, further include being connected on the oil outlet of slippage pump in above-mentioned land leveller front wheel driven hydraulic system
Accumulator.
It further, further include front-wheel Working mould connected to the controller in above-mentioned land leveller front wheel driven hydraulic system
Formula input unit, the three position four-way directional control valve are that both ends all have the solenoid valve that drive electromagnet is connect with controller；It is described
3-position 4-way commutation in three kinds of signals control front-wheel control valve that controller is sent according to the front-wheel operating mode input unit
Valve is in corresponding three kinds of working conditions.
Compared with prior art, the present invention the present invention is to be provided with differential between the A hydraulic fluid port of two front-wheel hydraulic motors
Control valve, steering and uneven road surface when driving, differential control valve conducting, so that hydraulic oil of two hydraulic pumps to conveying of coming
It is freely distributed between two hydraulic motors, meets and turn to or Uneven road and the differential driving requirements that generate.It is travelled in muddy road surface
When, differential control valve disconnects cut-off, and left and right motor is made to obtain identical hydraulic flow, keeps left and right tire rotational speed identical, avoids
Tire unilateral side trackslips and complete machine is made to lose tractive force, meets the limit idle running requirement on bad road surface.
Detailed description of the invention
Fig. 1 is land leveller front wheel driven hydraulic systematic schematic diagram of the present invention.
The schematic diagram of front-wheel drive control valve Fig. 2 of the invention.
Fig. 3 is sundstrand pump schematic diagram of the invention.
Fig. 4 is the electrical control block diagram of the front wheel driven hydraulic system of land leveller of the present invention.
Parts title and serial number in figure:
The near front wheel hydraulic motor 1, off-front wheel hydraulic motor 2, the near front wheel control valve 3, Speed Switch Valve 4, accumulator 5, the right side
Front-wheel control valve 6, repairing filter 7, counterbalance valve 8, sundstrand pump 9, fuel tank 10, differential control valve 11, controller 13, revolution speed sensing
Device 14, shift signal input unit 15, front-wheel operating mode input unit 16, steering detection device 17, differential control signal are defeated
Enter device 18, three position four-way directional control valve 31, two position-5 way valves 32, slippage pump 90, left variable pump 91, right variable pump 92, a left side
Fill valve 93, repairing overflow valve 94, left pump control mechanism 95, right pump control mechanism 96, left pump control mechanism solenoid valve 97, right pump control mechanism
Solenoid valve 98.
Specific embodiment
Illustrate specific embodiment with reference to the accompanying drawing.
As shown in Figure 1, the land leveller front wheel driven hydraulic system in the present embodiment includes sundstrand pump, two hydraulic horses of front-wheel
It reaches, the Speed Switch Valve 4 of two front-wheel control valves, fuel tank 10, two-bit triplet, counterbalance valve 8, accumulator 5, controller etc..
As shown in figure 3, combination pump group includes two variable pump groups, slippage pump 90, repairing overflow valve 94；Two variable pump groups
Structure having the same is left variable pump group and right variable pump group respectively, passes through a front-wheel control valve and a front-wheel respectively
Hydraulic motor connection.Wherein left variable pump group include left variable pump 91, the left pump control mechanism 95 for controlling left variable pump discharge,
Left pump control mechanism solenoid valve 97, the left Fill valve 93 being connect with left pump control mechanism 95；The A9 hydraulic fluid port and E9 hydraulic fluid port of left variable pump 91
Correspondence is connect with two actuator ports of left variable pump group, and two oil outlets of left Fill valve 93 respectively correspond and left variable pump 91
Two actuator ports connection；Corresponding two actuator ports with right variable pump group of the C9 hydraulic fluid port and F9 hydraulic fluid port of right variable pump 92 connect
It connects, two oil outlets of right Fill valve are respectively corresponded to be connect with two actuator ports of right variable pump, left Fill valve, right Fill valve
Oil inlet and slippage pump oil outlet connect.
As shown in Figure 1, the oil outlet of slippage pump 92 is connected with repairing filter 7, exported outward by repairing filter 7
Hydraulic oil.The oil outlet of slippage pump 92 is overflow with left Fill valve, right Fill valve and repairing simultaneously by the oil outlet of repairing filter 7
Flow the oil inlet connection of each valves such as valve, left pump control mechanism solenoid valve 97, right pump control mechanism solenoid valve 98.
As shown in Fig. 1 Fig. 2, two front-wheel control valves are the near front wheel control valve 3 and off-front wheel control valve 6 respectively, they have
There is identical structure, the near front wheel control valve 3 includes three position four-way directional control valve 31 and two position-5 way valves 32,3-position 4-way commutation
Valve 31 has C hydraulic fluid port, D hydraulic fluid port, c hydraulic fluid port and d hydraulic fluid port, and C hydraulic fluid port is connected with d hydraulic fluid port when three position four-way directional control valve 31 is in the next, D
Hydraulic fluid port is connected with c hydraulic fluid port；Conducting, D oil is connected in C hydraulic fluid port with c hydraulic fluid port and d hydraulic fluid port simultaneously when three position four-way directional control valve 31 is in middle position
Mouth cut-off；D hydraulic fluid port is connected with c hydraulic fluid port and d hydraulic fluid port simultaneously when three position four-way directional control valve 31 is in upper, the cut-off of C hydraulic fluid port；Two five
Logical reversal valve 32 has A hydraulic fluid port, B hydraulic fluid port, E hydraulic fluid port, F hydraulic fluid port, L hydraulic fluid port；The d hydraulic fluid port of three position four-way directional control valve 31 and two five are logical
The hydraulic control lower end of reversal valve 32 connects, and the c hydraulic fluid port of three position four-way directional control valve 31 is simultaneously and in the hydraulic control of two position-5 way valves 32
End is connected with L hydraulic fluid port；When two position-5 way valves 32 are in the next, E hydraulic fluid port is connected with F hydraulic fluid port, A hydraulic fluid port and B hydraulic fluid port simultaneously with L
Hydraulic fluid port conducting, when two position-5 way valves are in upper, E hydraulic fluid port is connected with A hydraulic fluid port, and F hydraulic fluid port is connected with B hydraulic fluid port, and L hydraulic fluid port is cut
Only.
As shown in Figure 1, each variable pump group corresponds to and a front-wheel control valve, the left variable pump 91 in left variable pump group
A9 hydraulic fluid port and E9 hydraulic fluid port correspondence are connect with the E hydraulic fluid port of two position-5 way valves 32 and F hydraulic fluid port in the near front wheel control valve 3, the near front wheel
The C hydraulic fluid port of three position four-way directional control valve 31 is connect by fuel tank circuit with fuel tank in control valve 3, three four in the near front wheel control valve 3
The D hydraulic fluid port of logical reversal valve 31 is connect by repairing filter 7 with the oil outlet of slippage pump 92, two five in the near front wheel control valve 3
The A hydraulic fluid port of logical reversal valve 32 is connected with the A hydraulic fluid port that B hydraulic fluid port corresponds to the near front wheel hydraulic motor with R hydraulic fluid port.The right side in right variable pump group
The corresponding E hydraulic fluid port and F hydraulic fluid port with two position-5 way valves in off-front wheel control valve 6 of the C9 hydraulic fluid port and F9 hydraulic fluid port of variable pump 92 connects
It connects, the C hydraulic fluid port of three position four-way directional control valve is connect by fuel tank circuit with fuel tank in off-front wheel control valve 6, in off-front wheel control valve 6
The D hydraulic fluid port of three position four-way directional control valve is connected by the oil outlet of repairing filter and slippage pump, two five in off-front wheel control valve 6
The A hydraulic fluid port of logical reversal valve is connected with the A hydraulic fluid port that B hydraulic fluid port corresponds to off-front wheel hydraulic motor 2 with R hydraulic fluid port.
The S hydraulic fluid port of the near front wheel hydraulic motor 1 and the S hydraulic fluid port of off-front wheel hydraulic motor 2 and the A hydraulic fluid port of Speed Switch Valve 4 connect
It connects, the B hydraulic fluid port of Speed Switch Valve 4 is connect with fuel tank, and the C hydraulic fluid port of Speed Switch Valve 4 is connect with the oil outlet of repairing filter 7.
Accumulator 5 is also connected in the oil outlet of repairing filter 7.External oil sources P point is connect with the oil inlet of counterbalance valve 8, counterbalance valve 8
Oil outlet connect with fuel tank, T of the external oil sources P point also with the T hydraulic fluid port of the near front wheel hydraulic motor 1 and off-front wheel hydraulic motor 2
Hydraulic fluid port connection.
As shown in Figure 1, it is connected with differential control valve between the A of the near front wheel hydraulic motor 1 and off-front wheel hydraulic motor 2 mouth,
Differential control valve is control terminal 2/2-way solenoid valve connected to the controller.
As shown in figure 4, shift signal input unit 15, front-wheel operating mode input unit 16 and speed probe 14, poor
Speed control signal input apparatus 18 is connect with controller 13, in the Electromagnetic Control end Y1 of Speed Switch Valve, the near front wheel control valve 3
The Electromagnetic Control end Y3 of three position four-way directional control valve, a left side in the Electromagnetic Control end Y2 of three position four-way directional control valve 31, off-front wheel control valve 6
The electromagnetism of the Electromagnetic Control end Y5 of the Electromagnetic Control end Y4 of pump control mechanism solenoid valve and right pump control mechanism solenoid valve, differential control valve
Also correspondence is connect control terminal Y6 with the control output end of controller 13.
Speed probe 14 can directly measure the revolving speed of land leveller rear-wheel, can also pass through certain grade of shaft on detection gearbox
Revolving speed and measure the revolving speed of rear-wheel indirectly；Shift signal input unit 15 can be and the linkage of land leveller gear operation handle
Dial position switch, is also possible to the automatically controlled gear operation handle of land leveller, high speed gear and low gear can according to machine from
Body situation and set, such as land leveller is in a gear or when second gear is considered bottom gear, in three gears or four gears or it is more high-grade when
For top gear；The highest gear of land leveller can also be set as top gear, other gears are bottom gear.The input of front-wheel operating mode
Device 16 can be dial position switch, such as dial position switch has freewheel mode, assistant mode and braking mode, front-wheel work
Mode input mechanism is in different mode dial position, controller output current potential make three position four-way directional control valve be in the next or middle position,
Or it is upper, to realize that front-wheel is in power-assisted driving, freewheel or braking operation mode.Differential control signal input apparatus can be with
It is a switch, when land leveller is in uneven road traveling, driver can be closed the switch this, and controller receives this and opens
It closes the signal for closing and generating and exports control signal to differential control valve, differential control valve is connected.The input of differential control signal
Device is also possible to alternating interface between man and computer, and driver is arranged by the alternating interface between man and computer so that controller controls differential control valve
It turns it on.Differential control signal input apparatus is also possible to detect the detection device of front-wheel vibration, when front-wheel vibration frequency and
When amplitude is more than preset value, controller judges that land leveller is in uneven road traveling, and controller also controls differential control at this time
Valve turns it on.When differential control signal input apparatus 18 is to controller output correlation signal, controller controls differential control
Valve is kept it turned off, and otherwise differential control valve is in the conductive state.Wherein the A hydraulic fluid port of front-wheel hydraulic motor is that front-wheel is rotated forward to forward
The oil inlet of the driving hydraulic oil of front-wheel hydraulic motor when sailing.
In the present embodiment, when land leveller does not use front-wheel power-assisted namely the near front wheel and off-front wheel are in freewheel row
When walking state, operator inputs corresponding electric signal to controller by front-wheel operating mode input unit 16, at this time controller
Not into the near front wheel control valve 3, the Electromagnetic Control end of three position four-way directional control valve 31 exports electric signal, then three in the near front wheel control valve 3
Position and four-way reversing valve 31 is in middle position (the middle position in Fig. 3), and two five-way valves 32 are located at bottom under spring force, at this point,
E hydraulic fluid port and F the hydraulic fluid port conducting of two five-way valves 32, the A9 hydraulic fluid port of left variable pump 91 is through two five-way valves in the near front wheel control valve 3
32 E hydraulic fluid port and F hydraulic fluid port return to the E9 hydraulic fluid port of left variable pump 91；Equally, for the E of two five-way valves in off-front wheel control valve 6
Hydraulic fluid port and the conducting of F hydraulic fluid port, the C9 hydraulic fluid port of right variable pump 92 is through the E hydraulic fluid port and F hydraulic fluid port time of two five-way valves in off-front wheel control valve 6
To the F9 hydraulic fluid port of right variable pump 92；At this point, left variable pump 91, the discharge capacity of right variable pump 92 are almost nil, the pressure of slippage pump 90
Oil supplements hydraulic oil to system after the filtering of repairing filter 7, through Fill valve 93, while external oil sources is introduced by P point
The T hydraulic fluid port of the near front wheel hydraulic motor and the T hydraulic fluid port of off-front wheel hydraulic motor, and back-pressure is established by counterbalance valve 8, before two
Wheel motor plunger pushes back plunger cavity, and the near front wheel hydraulic motor 1, off-front wheel hydraulic motor 2 is made to be in freewheel state.
When land leveller uses front-wheel power-assisted, operator passes through front-wheel operating mode input unit 16 to controller input pair
The electric signal answered, then into the near front wheel control valve 3, the Electromagnetic Control end output of three position four-way directional control valve 31 is corresponding electric for controller
Signal makes three position four-way directional control valve 31 in the near front wheel control valve 3 be in the next (bottom in Fig. 3), at this time the pressure of slippage pump
Oil by the D hydraulic fluid port of three position four-way directional control valve 31, the hydraulic control upper end of c hydraulic fluid port two five-way valves 32 into the near front wheel control valve 3,
Two five-way valves 32 are made to be in upper (upper in Fig. 3), the E hydraulic fluid port of two five-way valves 32 is communicated with A hydraulic fluid port, F hydraulic fluid port and B are oily
Mouthful communicate, communicate the A9 hydraulic fluid port of left variable pump 91 with the A hydraulic fluid port of the near front wheel hydraulic motor 1, the E9 hydraulic fluid port of left variable pump 91 and
The R of the near front wheel hydraulic motor 1 is communicated；Pressure oil is connected in the hydraulic control upper end of two five-way valves in same off-front wheel control valve 6, makes two
Position five-way valve is in upper (upper in Fig. 3), and the E hydraulic fluid port of two five-way valves is communicated with A hydraulic fluid port, F hydraulic fluid port is communicated with B hydraulic fluid port,
Communicate the C9 hydraulic fluid port of right variable pump 92 with the A hydraulic fluid port of off-front wheel hydraulic motor 2, the F9 hydraulic fluid port and off-front wheel liquid of right variable pump 92
The R of pressure motor 2 is communicated；Controller collects the revolving speed of rear-wheel by the speed probe on gearbox, calculates rear wheel speed,
Then identical control electric current is exported to the electromagnet Y4 of left pump control mechanism solenoid valve 97 and the electricity of right pump control mechanism solenoid valve 98
Magnet Y5 makes left variable pump 91, right variable pump 92, to export identical hydraulic flow to the near front wheel hydraulic motor 1, off-front wheel liquid
Pressure motor 2.And keep front wheel rotation speed identical as rear wheel rotation speed.
When the gear of level land machine gearbox enters high speed gear, shift signal input unit 15 is inputted to controller and is corresponded to
Electric signal, controller then conveys corresponding electric signal to Speed Switch Valve 4, and the Electromagnetic Control end Y1 of Speed Switch Valve 4 obtains electric, speed
It spends switching valve 4 to act, is in left position, communicates the A hydraulic fluid port of Speed Switch Valve 4 with C hydraulic fluid port, the pressure oil warp that slippage pump 90 exports
Repairing filter 7, Speed Switch Valve 4 enter the motor displacement switching hydraulic fluid port S and off-front wheel hydraulic motor of the near front wheel hydraulic motor 1
2 motor displacement switches hydraulic fluid port S, and the work discharge capacity of the near front wheel hydraulic motor 1, off-front wheel hydraulic motor 2 is switched by huge discharge
The high-speed motion of the near front wheel hydraulic motor 1, off-front wheel hydraulic motor 2 is realized to small displacement.
When land leveller braking, front-wheel operating mode input unit 16 is in braking mode state, and front-wheel operating mode is defeated
Enter device 16 and provides corresponding electric signal, the electricity of controller three position four-way directional control valve 31 into the near front wheel control valve 3 to controller
Magnetic control end conveys corresponding electric signal, and three position four-way directional control valve 31 acts, in pressure oil warp upper, that slippage pump 90 exports
Repairing filter 7, the near front wheel control valve 3 enter the hydraulic fluid port A and R of the near front wheel hydraulic motor 1, and motor piston is tightly attached in motor
On curved surface, the near front wheel hydraulic motor 1 is made to be in on-position；Same off-front wheel hydraulic motor 2 is also at on-position.
In the present invention, operator can realize front-wheel power running by controlling the on or off of differential control valve 11
When differential traveling or limit idle running.When 11 electromagnet Y6 of differential control valve obtains electric, differential control valve 11 is by the near front wheel liquid
The A mouth of pressure motor 1 and the A mouth of off-front wheel hydraulic motor disconnect, and the near front wheel hydraulic motor 1 and off-front wheel hydraulic motor 2 are respective
It is run in independent oil supply system, it is defeated since left variable pump 91 and right variable pump 92 obtain identical driving signal from controller
The hydraulic flow of phasor out, therefore the revolving speed of the near front wheel hydraulic motor 1, off-front wheel hydraulic motor 2 is identical always, thus can be with
Guarantee that front-wheel has always tractive force, avoids making complete machine lose tractive force because unilateral tire dallies.When 11 electromagnetism of differential control valve
When iron Y6 power loss, the A mouth of the near front wheel hydraulic motor 1 is connected to by differential control valve 11 with the A of off-front wheel hydraulic motor mouth, at this moment left
The hydraulic oil that variable pump 91 and right variable pump 92 export distributes automatically in the near front wheel hydraulic motor 1, off-front wheel hydraulic motor 2,
Adapt to the left and right wheels speed difference due to turning to or uneven road surface generates.
Claims (10)
1. a kind of land leveller front wheel driven hydraulic system, it is characterised in that including two variable pump groups, two front-wheel hydraulic motors,
Two front-wheel control valves, controllers；Each variable pump group connect to be formed with a front-wheel hydraulic motor through a front-wheel control valve
Closed loop；It is connect for controlling the Electromagnetic Control end of flow with controller in each variable pump group；Characterized by further comprising
Differential control valve, the differential control valve, which is connected between the A hydraulic fluid port of two front-wheel hydraulic motors, makes two front-wheel hydraulic motors
A hydraulic fluid port between be interconnected or cut-off.
2. land leveller front wheel driven hydraulic system according to claim 1, it is characterised in that the controller is to each change
Measure the identical hydraulic flow that the same control signal of pump group output controls the output of two variable pump groups.
3. land leveller front wheel driven hydraulic system according to claim 1 or 2, it is characterised in that further include connecting with controller
The differential control signal input apparatus connect, the differential control valve are the solenoid valves that Electromagnetic Control end is connect with the controller,
The controller controls whether the differential control valve is connected to two front-wheel hydraulic motors according to differential control signal input apparatus
A hydraulic fluid port.
4. land leveller front wheel driven hydraulic system according to claim 1 or 2, it is characterised in that it further include slippage pump, institute
Stating front-wheel control valve includes three position four-way directional control valve and two position-5 way valves, and the three position four-way directional control valve has C hydraulic fluid port, D
Hydraulic fluid port, c hydraulic fluid port and d hydraulic fluid port, C hydraulic fluid port is connected with d hydraulic fluid port when the three position four-way directional control valve is in the next, and D hydraulic fluid port is led with c hydraulic fluid port
It is logical；Conducting, the cut-off of D hydraulic fluid port is connected in C hydraulic fluid port with c hydraulic fluid port and d hydraulic fluid port simultaneously when the three position four-way directional control valve is in middle position；It is described
D hydraulic fluid port is connected with c hydraulic fluid port and d hydraulic fluid port simultaneously when three position four-way directional control valve is in upper, the cut-off of C hydraulic fluid port；Described two five logical to change
There is A hydraulic fluid port, B hydraulic fluid port, E hydraulic fluid port, F hydraulic fluid port, L hydraulic fluid port to valve；The d hydraulic fluid port of three position four-way directional control valve and two position-5 way valves
The c hydraulic fluid port of the connection of hydraulic control lower end, three position four-way directional control valve is connect with the hydraulic control upper end of two position-5 way valves and L hydraulic fluid port simultaneously；
When two position-5 way valve is in the next, E hydraulic fluid port is connected with F hydraulic fluid port, and A hydraulic fluid port is connected with L hydraulic fluid port simultaneously with B hydraulic fluid port, institute
State two position-5 way valves be in it is upper when, E hydraulic fluid port is connected with A hydraulic fluid port, and F hydraulic fluid port is connected with B hydraulic fluid port, L hydraulic fluid port end；Each change
Two actuator ports correspondence of amount pump group is connect with a front-wheel control valve E hydraulic fluid port and F hydraulic fluid port, the A oil of each front-wheel control valve
Mouth and B hydraulic fluid port correspondence are connect with the A hydraulic fluid port of front-wheel hydraulic motor and R hydraulic fluid port, and the D hydraulic fluid port and slippage pump of the front-wheel control valve are fuel-displaced
Mouth connection, C hydraulic fluid port are connect with fuel tank, and counterbalance valve is connected between external oil sources P point and fuel tank, the shell T of front-wheel hydraulic motor
Oil return opening is connected between external oil sources P point and the oil inlet of counterbalance valve.
5. land leveller front wheel driven hydraulic system according to claim 3, it is characterised in that each variable pump group packet
Variable pump, the pump control mechanism for controlling variable pump discharge are included, is connect with pump control mechanism and Electromagnetic Control end and the controller
Pump control mechanism solenoid valve, the Fill valve of connection；Two oil outlets of the Fill valve respectively correspond two with the variable pump
The oil outlet of actuator port connection, the oil inlet of the Fill valve and slippage pump connects, the oil inlet of pump control mechanism solenoid valve with
The oil outlet of slippage pump connects.
6. land leveller front wheel driven hydraulic system according to claim 5, it is characterised in that further include being connect with controller
For detecting the speed probe of land leveller rear wheel rotation speed, the controller controls the discharge capacity of the variable pump according to rear wheel rotation speed
Keep front wheel rotation speed equal with the rear wheel rotation speed of land leveller.
7. land leveller front wheel driven hydraulic system according to claim 3, it is characterised in that further include being connect with controller
Shift signal input unit and Speed Switch Valve, the Speed Switch Valve be two that Electromagnetic Control end is connect with the controller
B hydraulic fluid port and C the hydraulic fluid port correspondence of position-3-way solenoid valve, Speed Switch Valve are connect with fuel tank and slippage pump oil outlet, Speed Switch Valve
B hydraulic fluid port and C hydraulic fluid port or A hydraulic fluid port select a conducting；S oil of each front-wheel hydraulic motor for high tick-over discharge capacity switching control
Mouth is connect with the A hydraulic fluid port of Speed Switch Valve, and when land leveller gear is in high gear, the controller output electric current cuts speed
The C hydraulic fluid port for changing valve is connected with A hydraulic fluid port.
8. land leveller front wheel driven hydraulic system according to claim 3, it is characterised in that further include being connected to slippage pump
Oil outlet and fuel tank between repairing overflow valve.
9. land leveller front wheel driven hydraulic system according to claim 3, it is characterised in that further include being connected to slippage pump
Oil outlet on accumulator.
10. land leveller front wheel driven hydraulic system according to claim 3, it is characterised in that further include being connect with controller
Front-wheel operating mode input unit, the three position four-way directional control valve is that both ends all have and connect drive electromagnet with controller
Solenoid valve；Three in three kinds of signals control front-wheel control valve that the controller is sent according to the front-wheel operating mode input unit
Position and four-way reversing valve is in corresponding three kinds of working conditions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811283006.9A CN109356895A (en) | 2018-10-31 | 2018-10-31 | Land leveller front-wheel drive control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811283006.9A CN109356895A (en) | 2018-10-31 | 2018-10-31 | Land leveller front-wheel drive control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109356895A true CN109356895A (en) | 2019-02-19 |
Family
ID=65347417
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811283006.9A Withdrawn CN109356895A (en) | 2018-10-31 | 2018-10-31 | Land leveller front-wheel drive control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109356895A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110735458A (en) * | 2019-09-27 | 2020-01-31 | 广西柳工机械股份有限公司 | Front wheel driving hydraulic system of land leveler |
| CN113217485A (en) * | 2021-03-23 | 2021-08-06 | 中铁工程装备集团有限公司 | Hydraulic drive running control valve group, hydraulic drive system and vehicle |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106351898A (en) * | 2016-10-21 | 2017-01-25 | 广西柳工机械股份有限公司 | Land leveler front wheel driving hydraulic system |
| CN107218268A (en) * | 2017-05-19 | 2017-09-29 | 广西柳工机械股份有限公司 | Land leveller front wheel driven hydraulic system |
| CN207500219U (en) * | 2017-09-22 | 2018-06-15 | 天津工程机械研究院有限公司 | A kind of paver front-wheel drive control system |
-
2018
- 2018-10-31 CN CN201811283006.9A patent/CN109356895A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106351898A (en) * | 2016-10-21 | 2017-01-25 | 广西柳工机械股份有限公司 | Land leveler front wheel driving hydraulic system |
| CN107218268A (en) * | 2017-05-19 | 2017-09-29 | 广西柳工机械股份有限公司 | Land leveller front wheel driven hydraulic system |
| CN207500219U (en) * | 2017-09-22 | 2018-06-15 | 天津工程机械研究院有限公司 | A kind of paver front-wheel drive control system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110735458A (en) * | 2019-09-27 | 2020-01-31 | 广西柳工机械股份有限公司 | Front wheel driving hydraulic system of land leveler |
| CN113217485A (en) * | 2021-03-23 | 2021-08-06 | 中铁工程装备集团有限公司 | Hydraulic drive running control valve group, hydraulic drive system and vehicle |
| CN113217485B (en) * | 2021-03-23 | 2022-08-02 | 中铁工程装备集团有限公司 | Hydraulic drive running control valve group, hydraulic drive system and vehicle |
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Application publication date: 20190219 |
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