CN107448425A - Control valve and land leveller front wheel driven hydraulic system - Google Patents
Control valve and land leveller front wheel driven hydraulic system Download PDFInfo
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- CN107448425A CN107448425A CN201710598457.0A CN201710598457A CN107448425A CN 107448425 A CN107448425 A CN 107448425A CN 201710598457 A CN201710598457 A CN 201710598457A CN 107448425 A CN107448425 A CN 107448425A
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- hydraulic fluid
- fluid ports
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- hydraulic
- wheel
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Classifications
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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
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
- F15B11/042—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in"
- F15B11/0423—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in" by controlling pump output or bypass, other than to maintain constant speed
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/76—Graders, bulldozers, or the like with scraper plates or ploughshare-like elements; Levelling scarifying devices
- E02F3/80—Component parts
- E02F3/84—Drives or control devices therefor, e.g. hydraulic drive systems
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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
- F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H48/00—Differential gearings
- F16H48/12—Differential gearings without gears having orbital motion
- F16H48/18—Differential gearings without gears having orbital motion with fluid gearing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/38—Control of exclusively fluid gearing
- F16H61/40—Control of exclusively fluid gearing hydrostatic
- F16H61/42—Control of exclusively fluid gearing hydrostatic involving adjustment of a pump or motor with adjustable output or capacity
- F16H61/421—Motor capacity control by electro-hydraulic control means, e.g. using solenoid valves
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20546—Type of pump variable capacity
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/3056—Assemblies of multiple valves
- F15B2211/3059—Assemblies of multiple valves having multiple valves for multiple output members
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
- F15B2211/7058—Rotary output members
Abstract
The present invention relates to land leveller front wheel driven hydraulic system, to solve the problems, such as the unilateral skidding of asynchronous and front-wheel with rear wheel drive of existing land leveller front-wheel, a kind of front wheel driven hydraulic system of land leveller is provided, including transfer tube, two front-wheel hydraulic motors, Speed Switch Valve, state switching valve, flow divider and control valve, transfer tube is two-way variable displacement pump, front-wheel hydraulic motor is double work discharge capacity radial plunger type motor, two hydraulic fluid ports of transfer tube are corresponding to be connected with the C hydraulic fluid ports and D hydraulic fluid ports of control valve, the E hydraulic fluid ports of control valve and the J hydraulic fluid ports of flow divider connect, the F hydraulic fluid ports of control valve are connected with the R hydraulic fluid ports of two front-wheel hydraulic motors simultaneously, P hydraulic fluid ports and Q the hydraulic fluid ports connection corresponding with the A hydraulic fluid ports of two front-wheel hydraulic motors of flow divider.The present invention can effectively solve the defects of front-wheel present in the front wheel driven hydraulic system of the existing motor of one pump band of land leveller two asynchronous with rear wheel drive, the unilateral skidding of front-wheel, complete machine sideslip, improve the service life of front-wheel hydraulic motor.
Description
Technical field
The present invention relates to a kind of level land machine hydraulic system, more specifically to a kind of land leveller front-wheel drive control valve
And land leveller front wheel driven hydraulic system.
Background technology
Existing land leveller front wheel driven hydraulic system is by the front-wheel power-assisted open hydraulic system of a motor of transfer tube band two
System, for transfer tube from hydraulic oil container oil suction, outlet pressure oil is directly accessed two motors in parallel after control valve, then is returned through control valve
It is a kind of open type hydraulic system to hydraulic oil container.Hydraulic fluid flow rate size into motor is changed by 3-position 4-way inside control valve
Determine that the pressure of system is determined by the pressure shut-off valve of transfer tube to the valve core opening of valve.
When land leveller starts running work, the discharge capacity of transfer tube is under maximum pump discharge, the pressure oil band of transfer tube output
Dynamic revolution, in the presence of loading outside, transfer tube produces pressure.When the driving force of motor is more than traction, drive
Dynamic pump discharge pressure is less than pressure shut-off valve cut-out pressure, and pressure shut-off valve does not work, and transfer tube is in maximum pump discharge, motor
In maximum speed.When the driving force of motor is less than traction, driving pump discharge pressure reaches pressure shut-off valve cut-out
Pressure, pressure cut off valve events, driving pumpage reduce, and because trailing wheel continues to press on land leveller traveling, drive pump discharge pressure
Power reduces, pressure cut off valve events, driving pumpage increase.At this moment pressure shut-off valve ceaselessly acts, and maintains the row of transfer tube
Amount makes front-wheel match with rear wheel rotation speed.
Because the pressure oil of transfer tube output is directly accessed two motors in parallel after control valve, into the pressure oil of two motors
Flow freely distribute, when a side drive wheel and ground attachment condition are deteriorated, i.e., the side drive wheel is subject to ground reaction
Power diminishes, then the side motor, which obtains the flow of pressure oil, to increase, and causes the side motor rotary speed to be accelerated, and opposite side motor rotary speed
It is slack-off not turn even, i.e. the unilateral skidding of front-wheel.
Meanwhile the pressure oil of transfer tube output is directly entered front-wheel hydraulic motor oil inlet after control valve, motor is by certainly
Active wheel state is switched to by wheel state suddenly, because motor is radial plunger piston motor, plunger stretching or retraction are required for certain
Time, now, the pressure oil of transfer tube output abruptly enter motor inlet oil, and motor piston can be caused to occur with curved wall in motor
Collision is so-called engine knock phenomenon, causes motor life to greatly shorten.
Furthermore the pressure of transfer tube pressure shut-off valve be set up, but state of ground have local hollow, soil it is soft,
The conditions such as dry and wet are different and equipment load constantly change, grader tire are also in continuous of short duration change, pressure
Stop valve constantly acts, and causes the of short duration of front-wheel opposing rear wheels to trackslip, also easily cause land leveller traveling when or so rotation
Speed is inconsistent, or even the phenomenon of above-mentioned unilateral skidding occurs, causes complete machine properties to be deteriorated；Such as power loss increasing, lead
Draw degradation, while skid and cause tire wear to aggravate, cause ground attachment condition to become worse, greatly reduce land leveller
Economy and operating efficiency, can not effectively play the effect of front-wheel power-assisted, can also cause complete machine sideslip or sidesway, exist great
Potential safety hazard.
The content of the invention
The technical problem to be solved in the present invention is the above mentioned problem for the front-wheel drive of existing land leveller, and is provided a kind of
Control valve and the land leveller front wheel driven hydraulic system with the control valve.
The present invention is such to realize the technical scheme of its purpose：There is provided a kind of control valve, it is characterised in that including three
Position and four-way reversing valve and 3 position-5 way valve, the three position four-way directional control valve have G hydraulic fluid ports, H hydraulic fluid ports, g hydraulic fluid ports and h hydraulic fluid ports,
G hydraulic fluid ports turn on g hydraulic fluid ports when the three position four-way directional control valve is in left position, and H hydraulic fluid ports turn on h hydraulic fluid ports；The 3-position 4-way changes
G hydraulic fluid ports turn on conducting, the cut-off of H hydraulic fluid ports with h hydraulic fluid ports and g hydraulic fluid ports simultaneously when being in middle position to valve；At the three position four-way directional control valve
H hydraulic fluid ports turn on h hydraulic fluid ports and g hydraulic fluid ports simultaneously when right position, the cut-off of G hydraulic fluid ports；The 3 position-5 way valve has C hydraulic fluid ports, D oil
Mouth, E hydraulic fluid ports, F hydraulic fluid ports, L hydraulic fluid ports；The g hydraulic fluid ports of three position four-way directional control valve and the hydraulic control left end of 3 position-5 way valve connect, three
The h hydraulic fluid ports of four-way reversing valve are connected with the hydraulic control right-hand member and L hydraulic fluid ports of 3 position-5 way valve simultaneously；The 3 position-5 way valve
During in left position, C hydraulic fluid ports turn on D hydraulic fluid ports, and E hydraulic fluid ports turn on L hydraulic fluid ports simultaneously with F hydraulic fluid ports, at the 3 position-5 way valve
When middle position, C hydraulic fluid ports, D hydraulic fluid ports, E hydraulic fluid ports, F hydraulic fluid ports and L hydraulic fluid ports simultaneously turn on, when the 3 position-5 way valve is in right position,
C hydraulic fluid ports turn on E hydraulic fluid ports, and D hydraulic fluid ports turn on F hydraulic fluid ports, the cut-off of L hydraulic fluid ports.Further, the three position four-way directional control valve is both ends
It is respectively provided with the magnetic valve of DM.
The present invention is such to realize the technical scheme of its purpose：A kind of front wheel driven hydraulic system of land leveller is provided
System, including transfer tube, two front-wheel hydraulic motors, it is characterised in that the speed switching also including slippage pump, fuel tank, two-bit triplet
Valve, the state switching valve of two-bit triplet, flow divider and foregoing control valve, the transfer tube are two-way variable displacement pump, the front-wheel
The double work discharge capacity radial plunger type motor that hydraulic motor switches for high tick-over discharge capacity, two hydraulic fluid ports of the transfer tube
Corresponding to be connected with the C hydraulic fluid ports and D hydraulic fluid ports of control valve, the E hydraulic fluid ports of control valve and the J hydraulic fluid ports of flow divider connect, the F hydraulic fluid ports of control valve
Be connected simultaneously with the R hydraulic fluid ports of two front-wheel hydraulic motors, the P hydraulic fluid ports and Q hydraulic fluid ports of flow divider respectively with two front-wheel hydraulic motors
A hydraulic fluid ports corresponding connect；The H hydraulic fluid ports of the control valve are connected with slippage pump oil-out, and G hydraulic fluid ports and the fuel tank of the control valve connect
Connect, two front-wheel hydraulic motors are used for N hydraulic fluid port of the S hydraulic fluid ports of high tick-over discharge capacity switching control simultaneously with Speed Switch Valve and connected
Connect, the K hydraulic fluid ports and M hydraulic fluid ports of Speed Switch Valve are corresponding to be connected with fuel tank and slippage pump oil-out, the N hydraulic fluid ports and K of Speed Switch Valve
Hydraulic fluid port or M hydraulic fluid ports select a conducting；The U hydraulic fluid ports of the state switching valve are connected with wheel motor oil return T hydraulic fluid ports before two simultaneously, and state is cut
The V hydraulic fluid ports for changing valve are connected through pressure-reducing valve with repairing pump discharge, and W hydraulic fluid ports are connected with fuel tank, U hydraulic fluid ports and the V hydraulic fluid ports of state switching valve
Or W hydraulic fluid ports select a conducting.
In the front wheel driven hydraulic system of above-mentioned land leveller, the flow divider include electromagnetic switch valve, pilot operated directional control valve, etc.
Than flow divider, pressure-reducing valve, the T hydraulic fluid ports of the flow divider connect with fuel tank；The electromagnetic switch valve is connected to the liquid controlled reversing
Between the hydraulic control end of valve and T hydraulic fluid ports, the pressure-reducing valve be connected to the pilot operated directional control valve hydraulic control end and flow divider J hydraulic fluid ports it
Between, the pilot operated directional control valve has the J1 hydraulic fluid ports being connected with J hydraulic fluid ports, the J2 being connected with the J3 hydraulic fluid ports of grade ratio flow divider oil
Mouth, the P1 hydraulic fluid ports and Q1 hydraulic fluid ports correspondingly connected with the P hydraulic fluid ports and Q hydraulic fluid ports of the flow divider；The grade is than flow divider by two phases
With choke valve form, the J3 hydraulic fluid ports of one end of two choke valves with the grade ratio flow divider connect, two choke valves
The other end corresponding connected with the P hydraulic fluid ports and Q hydraulic fluid ports of the flow divider；The J hydraulic fluid ports of flow divider and the J1 of the pilot operated directional control valve
Hydraulic fluid port connects, and its J1 hydraulic fluid port turns on J2 hydraulic fluid ports when the pilot operated directional control valve is in the first working position, at the pilot operated directional control valve
Its J1 hydraulic fluid port turns on J2 hydraulic fluid ports, P1 hydraulic fluid ports, Q1 hydraulic fluid ports when the second working position；Between the P hydraulic fluid ports and Q hydraulic fluid ports of the flow divider
It is connected with choke valve.
In the front wheel driven hydraulic system of above-mentioned land leveller, in addition to for control it is described driving pump discharge controller,
It is connected to detect the speed probe of land leveller rear wheel rotation speed, the Speed Switch Valve and the state switching valve with controller
It is magnetic valve, the Speed Switch Valve, the state switching valve, the electromagnetism of the three position four-way directional control valve and electromagnetic switch valve
Coil connects with the corresponding output end of the controller, and the controller controls the transfer tube according to land leveller rear wheel rotation speed
Discharge capacity make front wheel rotation speed equal with the rear wheel rotation speed of land leveller.Speed probe can direct measurement land leveller trailing wheel rotating speed,
The rotating speed of trailing wheel can also be measured indirectly by detecting the rotating speed of certain grade of rotating shaft on gearbox, controller according to rear wheel rotation speed,
Output control electric current gives transfer tube stroking mechanism, to export the flow of corresponding speed to preceding wheel motor；When land leveller speed occurs
Change, i.e., when the rear wheel rotation speed value that speed probe collects changes, controller recalculates rear wheel speed, to driving
Pump sends instruction, and to export the flow of corresponding speed to preceding wheel motor, the speed and rear wheel speed for making preceding wheel motor remain
Unanimously.
In the front wheel driven hydraulic system of above-mentioned land leveller, in addition to the land leveller shift signal input being connected with controller
Device, when land leveller gear is in high gear, the controller output current leads the M hydraulic fluid ports of Speed Switch Valve and N hydraulic fluid ports
It is logical.When the gear of level land machine gearbox enters high speed gear, speed switching electromagnet obtains electric, Speed Switch Valve action, repairing
Pump pressure oil enters front-wheel motor displacement switching valve, before the work discharge capacity of preceding wheel motor is switched into small displacement realization by huge discharge
Wheel motor high-speed motion.Land leveller shift signal input unit can be opened with the DIP of land leveller gear operation handle linkage
Pass or the automatically controlled gear operation handle of land leveller.
In the front wheel driven hydraulic system of above-mentioned land leveller, in addition to the front-wheel mode of operation input dress being connected with controller
Put, the both ends magnet coil of three position four-way directional control valve is connected with controller, and the controller is defeated according to the front-wheel mode of operation
Three kinds of output states for entering device correspond to output current and three position four-way directional control valve in the control valve is in left position, middle position and the right side
Position.When the three position four-way directional control valve of control valve is in middle position, state switching valve is in bottom, and U hydraulic fluid ports turn on V hydraulic fluid ports, mends
The pressure oil of oil pump output enters motor shell through pressure-reducing valve, motor piston is pushed back into plunger cavity, now motor is in freewheel
State；When the three position four-way directional control valve of control valve is in left position or right position, state switching valve is in upper, U hydraulic fluid ports and W hydraulic fluid ports
Conducting, motor shell oil return communicate with fuel tank, and now motor is in active wheel state.Front-wheel mode of operation input unit can be
DIP switchs, such as DIP switch has freewheel pattern, assistant mode and braking mode, front-wheel mode of operation input unit
In different pattern DIPs, controller output current potential makes three position four-way directional control valve be in middle position or left position or right position, meanwhile,
Controller output current potential makes state switching valve be in upper or the next, so as to realize that front-wheel is in freewheel, power-assisted driving or system
Start building operation mode.
In the front wheel driven hydraulic system of above-mentioned land leveller, in addition to the front-wheel steer induction installation being connected with controller,
The magnet coil of electromagnetic switch valve is connected with controller, and the controller is according to detected by the front-wheel steer induction installation
Output control electric current makes the electromagnetic switch valve be on or cut-off state respectively for front-wheel steer state and front-wheel straight-going state.
When land leveller uses front-wheel drive straight line operation, turn to the output of induction installation no signal, electromagnetic switch valve obtain it is electric, in the right side
Position, now, pilot operated directional control valve are in the ratio such as the first working position, the fluid of transfer tube output and branch to the near front wheel hydraulic motor and the right side
Front-wheel hydraulic motor so that the rotating speed of left and right front-wheel hydraulic motor is consistent, ensures land leveller straight line operation, avoids front-wheel is unilateral from beating
Sliding or complete machine deviation phenomenon；When land leveller is turned to using front-wheel drive, induction installation is turned to controller output signal, makes electricity
Magnetic switch valve dead electricity, now, pilot operated directional control valve are in the second working position, and the fluid of transfer tube output freely branches to the near front wheel liquid
Pressure motor and off-front wheel hydraulic motor, ensure that land leveller can be turned to smoothly, avoiding the occurrence of steering, outboard wheel is dragged causes to take turns
Tire abrasion, complete machine turn to the dangerous phenomenons such as difficult and complete machine sliding.
In the front wheel driven hydraulic system of above-mentioned land leveller, in addition to two-way oil compensation valve, its oil-out correspond to and the drive
Two hydraulic fluid ports connection of dynamic pump, oil inlet are connected with the oil-out of the slippage pump.
Compared with prior art, the present invention solves front-wheel assisted hydraulic system not because of surface condition and work clothes to the present invention
Put the influence of load and front-wheel opposing rear wheels is trackslipped, the speed of front-wheel follows the speed of trailing wheel all the time；Can effectively solve
The defects of unilateral skidding of front-wheel present in the front wheel driven hydraulic system of the existing motor of one pump band of land leveller two, complete machine sideslip,
Also solve that the steering outboard wheel being likely to occur during steering is dragged to cause tire wear, complete machine to turn to difficult and complete machine simultaneously
The dangerous phenomenons such as sliding, land leveller during straight trip arrives straight trip again to steering, cut automatically by flow divider flow shunt pattern
Change, realize automatic control function, and can be cut during land leveller traveling and change to front-wheel drive function freely, can be effective
Ground plays the effect of front-wheel power-assisted.Meanwhile solve and touched using front-wheel hydraulic motor plunger during front-wheel drive with curved wall in motor
Problem is hit, improves the service life of front-wheel hydraulic motor.
Brief description of the drawings
Fig. 1 is the land leveller front wheel driven hydraulic systematic schematic diagram of the present invention.
Fig. 2 is the control valve schematic diagram of the present invention.
Fig. 3 is the flow divider schematic diagram of the present 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 sequence number in figure：
Fuel tank 1, transfer tube 2, repairing filter 3, Speed Switch Valve 4, control valve 5, flow divider 6, left front wheel motor 7 are right
Preceding wheel motor 8, state switching valve 9, pressure-reducing valve 10, repairing overflow valve 11, two-way oil compensation valve 12, slippage pump 13, controller 14, turn
Fast sensor 15, shift signal input unit 16, front-wheel mode of operation input unit 17, front-wheel steer induction installation 18, control
Valve three position four-way directional control valve 51, control valve 3 position-5 way valve 52, electromagnetic switch valve 61, pilot operated directional control valve 62, wait than shunting
Valve 63, choke valve 64, pressure-reducing valve 65, first throttle valve 631, second throttle 632, DM Y1, Breake Electromagnet Y2,
Speed switches electromagnet Y3, state switching electromagnet Y4, electromagnetic switch electromagnet Y5.
Embodiment
Illustrate specific embodiment below in conjunction with the accompanying drawings.
As shown in figure 1, the land leveller front wheel driven hydraulic system in the present embodiment includes fuel tank 1, transfer tube 2, repairing
Filter 3, Speed Switch Valve 4, control valve 5, flow divider 6, the near front wheel hydraulic motor 7, off-front wheel hydraulic motor 8, state switching valve
9th, pressure-reducing valve 10, repairing overflow valve 11, two-way oil compensation valve 12, slippage pump 13, controller 14, speed probe 15, shift signal
Input unit 16, front-wheel mode of operation input unit 17, front-wheel steer induction installation 18.
As shown in Fig. 2 control valve 5 includes three position four-way directional control valve 51 and 3 position-5 way valve 52,3-position 4-way commutation
Valve 51 is the magnetic valve that both ends are respectively provided with DM, and its left end has DM Y1, and right-hand member has Breake Electromagnet
Y2.Three position four-way directional control valve 51 has G hydraulic fluid ports, H hydraulic fluid ports, g hydraulic fluid ports and h hydraulic fluid ports, G oil when three position four-way directional control valve 51 is in left position
Mouth turns on g hydraulic fluid ports, and H hydraulic fluid ports turn on h hydraulic fluid ports；When three position four-way directional control valve 51 is in middle position G hydraulic fluid ports simultaneously with h hydraulic fluid ports and g
Hydraulic fluid port conducting conducting, the cut-off of H hydraulic fluid ports；H hydraulic fluid ports turn on h hydraulic fluid ports and g hydraulic fluid ports simultaneously when three position four-way directional control valve 51 is in right position,
G hydraulic fluid ports end；3 position-5 way valve 52 has C hydraulic fluid ports, D hydraulic fluid ports, E hydraulic fluid ports, F hydraulic fluid ports, L hydraulic fluid ports；Three position four-way directional control valve 51
G hydraulic fluid ports be connected with the hydraulic control left end of 3 position-5 way valve 52, the h hydraulic fluid ports of three position four-way directional control valve 51 are simultaneously and 3 position-5 way
The hydraulic control right-hand member of reversal valve 52 connects with L hydraulic fluid ports；When 3 position-5 way valve 52 is in left position, C hydraulic fluid ports turn on D hydraulic fluid ports, E oil
Mouthful with F hydraulic fluid ports while turning on L hydraulic fluid ports, when 3 position-5 way valve 52 is in middle position, C hydraulic fluid ports, D hydraulic fluid ports, E hydraulic fluid ports, F hydraulic fluid ports and
L hydraulic fluid port mutual conductions, when 3 position-5 way valve 52 is in right position, C hydraulic fluid ports turn on E hydraulic fluid ports, and D hydraulic fluid ports turn on F hydraulic fluid ports, L
Hydraulic fluid port ends.
As shown in figure 3, flow divider 6 include electromagnetic switch valve 61, pilot operated directional control valve 62, etc. than flow divider 63, choke valve 64
With pressure-reducing valve 65, flow divider 6 has J hydraulic fluid ports, P hydraulic fluid ports, Q hydraulic fluid ports, T hydraulic fluid ports；J hydraulic fluid ports connect with the E hydraulic fluid ports of control valve 5, P hydraulic fluid ports
Connected with the A mouths of the near front wheel hydraulic motor 7, the A mouths connection of Q hydraulic fluid port function off-front wheels hydraulic motor 8, T hydraulic fluid ports connect with fuel tank 1
It is logical；Electromagnetic switch valve 61 is connected between the hydraulic control end of pilot operated directional control valve 62 and T hydraulic fluid ports, and pressure-reducing valve 65 is connected to pilot operated directional control valve
Between 62 hydraulic control end and J hydraulic fluid ports, wait and be made up of than flow divider 63 two identical choke valves, first throttle valve 631, second saves
Flow J3 hydraulic fluid port of the one end of valve 632 with grade ratio flow divider 63 to connect, the other end of first throttle valve 631 and the P oil of flow divider 6
Mouth connection, the other end of second throttle 632 is connected with the Q hydraulic fluid ports of flow divider 6, between the Q hydraulic fluid ports and P hydraulic fluid ports of flow divider 6
It is connected with choke valve 64.Pilot operated directional control valve 62 has the J1 hydraulic fluid ports connected with J hydraulic fluid ports, connected with the J3 hydraulic fluid ports of grade ratio flow divider 63
J2 hydraulic fluid ports and the P1 hydraulic fluid ports and Q1 hydraulic fluid ports that are correspondingly connected with the P hydraulic fluid ports and Q hydraulic fluid ports of flow divider；Pilot operated directional control valve 62 is in first
Its J1 hydraulic fluid port turns on J2 hydraulic fluid ports during working position, its J1 hydraulic fluid port and P1 hydraulic fluid ports, Q1 when pilot operated directional control valve 62 is in the second working position
Hydraulic fluid port and the conducting of J2 hydraulic fluid ports.When pilot operated directional control valve 62 is in the first working position, flow divider 6 is in wait and changed than SHUNT state, hydraulic control
When being in the second working position to valve 62, flow divider 6 is in free SHUNT state.
Transfer tube 2 is variable pump, and the near front wheel hydraulic motor 7 and off-front wheel hydraulic motor 8 are high tick-over discharge capacity switchings
Double work discharge capacity radial plunger type motor, its mode of operation can control by the S hydraulic fluid ports on hydraulic motor, be operated in it
Under huge discharge slow-speed of revolution pattern or work under the low high rotating speed pattern of discharge capacity, the near front wheel hydraulic motor 7 and off-front wheel hydraulic pressure horse
It is to be connected in parallel between up to 8.
Speed Switch Valve 4 is two-bit triplet magnetic valve, and there is speed to switch electromagnet Y3, the N hydraulic fluid ports of Speed Switch Valve 4 for it
A conducting is selected with K hydraulic fluid ports or M hydraulic fluid ports.
State switching valve 9 is two-bit triplet magnetic valve, and there is state to switch electromagnet Y4, the U hydraulic fluid ports of state switching valve 9 for it
A conducting is selected with V hydraulic fluid ports or W hydraulic fluid ports.
As shown in figure 1, the corresponding C hydraulic fluid ports and D hydraulic fluid ports with control valve 5 of two hydraulic fluid ports (A hydraulic fluid ports and B hydraulic fluid ports) of transfer tube 2
(namely C hydraulic fluid ports and D hydraulic fluid ports of 3 position-5 way valve 52) is connected, and the E hydraulic fluid ports of control valve 5 are connected with the J hydraulic fluid ports of flow divider 6,
The F hydraulic fluid ports of control valve 5 connect with the R hydraulic fluid ports of the near front wheel hydraulic motor 7, off-front wheel hydraulic motor 8 simultaneously.
The oil-out of slippage pump 13 is connected with repairing filter 3, passes through repairing filter 3 and the H of front-wheel drive control valve 5
Hydraulic fluid port (namely H hydraulic fluid ports of three position four-way directional control valve 51) connects, the G hydraulic fluid ports of front-wheel drive control valve 5 (namely 3-position 4-way commutation
The G hydraulic fluid ports of valve 51) it is connected with fuel tank 1.
The near front wheel hydraulic motor 7 and off-front wheel hydraulic motor 8 are used for the S hydraulic fluid ports and speed of high tick-over discharge capacity switching control
The N hydraulic fluid ports connection of switching valve 4 is spent, the K hydraulic fluid ports of Speed Switch Valve 4 are connected with fuel tank；The oil-out of slippage pump 13 passes through repairing
Filter 3 is connected with the M hydraulic fluid ports of Speed Switch Valve 4.It is connected between two hydraulic fluid ports (A hydraulic fluid ports and B hydraulic fluid ports) of transfer tube 2 two-way
Fill valve 12, two oil-outs of the two-way oil compensation valve 12 are corresponding to be connected with two hydraulic fluid ports of transfer tube 2, two-way oil compensation valve 12
Oil inlet is connected with the outlet of repairing filter 3.
The T hydraulic fluid ports of the near front wheel hydraulic motor 7 and off-front wheel hydraulic motor 8 are connected with the U hydraulic fluid ports of state switching valve 9, state
The W hydraulic fluid ports of switching valve 9 are connected with fuel tank, and the V hydraulic fluid ports of state switching valve 9 are connected with the oil-out of pressure-reducing valve 10；Slippage pump 13
Oil-out is connected by repairing filter 3, pressure-reducing valve 10 with the V hydraulic fluid ports of state switching valve 9.
As shown in figure 4, speed probe 15, shift signal input unit 16, front-wheel mode of operation input unit 17 and preceding
Rotate to induction installation 18 and be connected with controller 14, DM Y1, Breake Electromagnet Y2, speed switching electromagnet Y3, shape
State switching electromagnet Y4, electromagnetic switch electromagnet Y5 and the transfer tube 2 corresponding control output end with controller 14 of control terminal
Connection.Speed probe 15 can direct measurement land leveller trailing wheel rotating speed, can also be by detecting on gearbox certain grade of rotating shaft
Rotating speed and the rotating speed for measuring trailing wheel indirectly；Shift signal input unit 16 can be group with the linkage of land leveller gear operation handle
The automatically controlled gear operation handle of bit switch or land leveller.Front-wheel mode of operation input unit 16 can be DIP switch,
Such as DIP switch has freewheel pattern, assistant mode and braking mode, front-wheel mode of operation input unit is in difference
Pattern DIP, controller 14 export current potential three position four-way directional control valve 51 is in left position or middle position or right position, control simultaneously
Device 14, which exports current potential, makes state switching valve 9 be in upper or the next, so as to realize that front-wheel is in freewheel, power-assisted driving or braking
Mode of operation.Front-wheel steer induction installation 18 can be angular displacement sensor, can also position switch.
In this embodiment, when land leveller is without using front-wheel drive, namely front-wheel mode of operation input unit 17 is to be in
During freewheel state, C hydraulic fluid port of the A hydraulic fluid ports through control valve 5, the D hydraulic fluid ports of transfer tube 2 return to the B hydraulic fluid ports of transfer tube 2.Now, drive
The discharge capacity of pump 2 is almost nil, and the pressure oil of slippage pump 13 is mended after the filtering of repairing filter 3, by Fill valve 12 to system
Topping up presses oil, while introduces the near front wheel hydraulic motor 7, the shell of off-front wheel hydraulic motor 8 by pressure-reducing valve 10, state switching valve 9
Body oil return inlet T hydraulic fluid port, front-wheel motor piston is pushed back into plunger cavity, be in the near front wheel hydraulic motor 7, off-front wheel hydraulic motor 8
Freewheel state.
When land leveller uses front-wheel drive, namely when front-wheel mode of operation input unit 17 is in running order, three
The DM Y1 of position and four-way reversing valve 51 obtains electric, and three position four-way directional control valve 51 acts, defeated by slippage pump 13 in left position
The pressure oil gone out commutates 3 position-5 way valve 52 from left position to right position, when 3 position-5 way valve 52 commutates to middle position,
C hydraulic fluid ports, D hydraulic fluid ports, E hydraulic fluid ports, F hydraulic fluid ports and the L hydraulic fluid port mutual conductions of control valve 5, when 3 position-5 way valve 52 commutates to right position
When, the C hydraulic fluid ports of control valve 5 turn on E hydraulic fluid ports, D hydraulic fluid ports turn on F hydraulic fluid ports, make the A hydraulic fluid ports of transfer tube 2 and the J oil of flow divider 6
Mouth conducting；If land leveller does not turn to, output signal, i.e. electromagnetic switch electromagnet Y5 are not obtained front-wheel steer induction installation 18
Electricity, electromagnetic switch valve 61 are in right position, and the pressure oil of transfer tube 2 enters the upper end of pilot operated directional control valve 62, hydraulic control through pressure-reducing valve 65
Reversal valve 62 commutates, and in upper, now, the pressure oil of transfer tube 2 branches to flow divider 6 by ratios such as J1 mouths, J2 mouths, J3 mouths
P hydraulic fluid ports and Q hydraulic fluid ports；If land leveller turns to, front-wheel steer induction installation 18 makes electromagnetic switch to the output signal of controller 14
Electromagnet Y5 dead electricity, electromagnetic switch valve 61 are in left position, and the pressure oil of transfer tube 2 enters pilot operated directional control valve 62 through pressure-reducing valve 65
Upper end simultaneously returns to fuel tank 1 through T mouths, and pilot operated directional control valve 62 does not commutate, and in bottom, now, the pressure oil of transfer tube 2 passes through J1
Mouth, P1 mouths, Q1 mouths freely branch to the P hydraulic fluid ports and Q hydraulic fluid ports of flow divider 6；The P hydraulic fluid ports of flow divider 6 and the near front wheel hydraulic motor 7
The conducting of A hydraulic fluid ports, Q hydraulic fluid ports turn on the A hydraulic fluid ports of off-front wheel hydraulic motor 8；The F hydraulic fluid ports of control valve 5 and the near front wheel hydraulic motor 7 and
The R mouths conducting of off-front wheel hydraulic motor 8；Meanwhile the pressure oil that slippage pump 13 exports passes through after the filtering of repairing filter 3
Fill valve 12 supplements hydraulic oil to system；Meanwhile the electromagnet Y4 of state switching valve 9 obtains electric, state switching valve 9 acts, and is in
Upper, the near front wheel hydraulic motor 7, the oil return inlet T hydraulic fluid port of off-front wheel hydraulic motor 8 communicate with fuel tank 1；Controller 14 passes through rotating speed
Sensor 15 collects the rotating speed of trailing wheel, calculates rear wheel speed, stroking mechanism of the output control electric current to transfer tube 2, with defeated
Go out the flow of corresponding speed to the near front wheel hydraulic motor 7 and off-front wheel hydraulic motor 8；When land leveller speed changes, that is, turn
When the rear wheel rotation speed value that fast sensor collects changes, controller recalculates rear wheel speed, and output control electric current
To the stroking mechanism of transfer tube 2, to export the flow of corresponding speed to the near front wheel hydraulic motor 7, off-front wheel hydraulic motor 8, make
The near front wheel hydraulic motor 7, the speed of off-front wheel hydraulic motor 8 and rear wheel speed are always consistent.
When the gear of level land machine gearbox enters high speed gear, shift signal input unit 15 provides accordingly to controller
Electric signal, controller causes the speed of Speed Switch Valve 4 to switch electromagnet Y3 and obtain electric, and Speed Switch Valve 4 acts, in upper
Position, makes the M mouths of Speed Switch Valve 4 be communicated with N mouths, and the pressure oil that slippage pump 13 exports is through repairing filter 3, Speed Switch Valve 4
Discharge capacity into the near front wheel hydraulic motor 7, off-front wheel hydraulic motor 8 switches hydraulic fluid port S hydraulic fluid ports, before the near front wheel hydraulic motor 7, the right side
The work discharge capacity of wheel hydraulic motor 8 is switched to small displacement by huge discharge and realizes the near front wheel hydraulic motor 7, off-front wheel hydraulic motor 8
High-speed motion；
When land leveller is braked, front-wheel mode of operation input unit 17 is in brake working condition, and front-wheel mode of operation is defeated
Enter device 17 and provide corresponding electric signal to controller, it is electric that controller make it that the electromagnet Y4 of state switching valve 9 is obtained, state switching
Valve 9 acts, and in upper, the near front wheel hydraulic motor 7, the oil return inlet T hydraulic fluid port of off-front wheel hydraulic motor 8 communicate with fuel tank 1, together
When, it is electric that controller make it that the Breake Electromagnet Y2 of three position four-way directional control valve 51 is obtained, and the action of three position four-way directional control valve 51 is in right position,
3 position-5 way valve 52 is in left position, and the pressure oil of slippage pump enters into the near front wheel hydraulic motor 7, off-front wheel hydraulic motor 8
Oil-out, motor piston is close on motor negative camber, motor is in on-position.
Compared with prior art, the present invention solves front-wheel assisted hydraulic system not because of surface condition and work clothes to the present invention
Put the influence of load and front-wheel opposing rear wheels is trackslipped, the speed of front-wheel follows the speed of trailing wheel all the time；Can effectively solve
The defects of unilateral skidding of front-wheel present in the front wheel driven hydraulic system of the existing motor of one pump band of land leveller two, complete machine sideslip,
Also solve that the steering outboard wheel being likely to occur during steering is dragged to cause tire wear, complete machine to turn to difficult and complete machine simultaneously
The dangerous phenomenons such as sliding, land leveller during straight trip arrives straight trip again to steering, cut automatically by flow divider flow shunt pattern
Change, realize automatic control function, and can be cut during land leveller traveling and change to front-wheel drive function freely, can be effective
Ground plays the effect of front-wheel power-assisted.Meanwhile solve and touched using front-wheel hydraulic motor plunger during front-wheel drive with curved wall in motor
Problem is hit, improves the service life of front-wheel hydraulic motor.
Claims (9)
1. a kind of control valve, it is characterised in that including three position four-way directional control valve and 3 position-5 way valve, the 3-position 4-way changes
There is G hydraulic fluid ports, H hydraulic fluid ports, g hydraulic fluid ports and h hydraulic fluid ports to valve, G hydraulic fluid ports are led with g hydraulic fluid ports when the three position four-way directional control valve is in left position
Logical, H hydraulic fluid ports turn on h hydraulic fluid ports；G hydraulic fluid ports turn on h hydraulic fluid ports and g hydraulic fluid ports simultaneously when the three position four-way directional control valve is in middle position
It is logical, the cut-off of H hydraulic fluid ports；H hydraulic fluid ports are turned on h hydraulic fluid ports and g hydraulic fluid ports simultaneously when the three position four-way directional control valve is in right position, and G hydraulic fluid ports are cut
Only；The 3 position-5 way valve has C hydraulic fluid ports, D hydraulic fluid ports, E hydraulic fluid ports, F hydraulic fluid ports, L hydraulic fluid ports；The g hydraulic fluid ports of three position four-way directional control valve
It is connected with the hydraulic control left end of 3 position-5 way valve, the h hydraulic fluid ports of three position four-way directional control valve while the liquid with 3 position-5 way valve
Control right-hand member connects with L hydraulic fluid ports；When the 3 position-5 way valve is in left position, C hydraulic fluid ports turn on D hydraulic fluid ports, E hydraulic fluid ports and F hydraulic fluid ports
Turned on simultaneously with L hydraulic fluid ports, when the 3 position-5 way valve is in middle position, C hydraulic fluid ports, D hydraulic fluid ports, E hydraulic fluid ports, F hydraulic fluid ports and L hydraulic fluid ports are same
When turn on, when the 3 position-5 way valve is in right position, C hydraulic fluid ports are turned on E hydraulic fluid ports, and D hydraulic fluid ports turn on F hydraulic fluid ports, and L hydraulic fluid ports are cut
Only.
2. control valve according to claim 1, it is characterised in that the three position four-way directional control valve is that both ends are respectively provided with driving
The magnetic valve of electromagnet.
3. a kind of front wheel driven hydraulic system of land leveller, including transfer tube, two front-wheel hydraulic motors, it is characterised in that also wrap
Include institute in slippage pump, fuel tank, the Speed Switch Valve of two-bit triplet, the state switching valve of two-bit triplet, flow divider and claim 2
The control valve stated, the transfer tube are two-way variable displacement pump, and the front-wheel hydraulic motor is the duplex of high tick-over discharge capacity switching
Make discharge capacity radial plunger type motor, two hydraulic fluid ports of the transfer tube are corresponding to be connected with the C hydraulic fluid ports and D hydraulic fluid ports of control valve, is controlled
The J hydraulic fluid ports of the E hydraulic fluid ports of valve processed and flow divider connect, and the R hydraulic fluid ports of the F hydraulic fluid ports of control valve simultaneously with two front-wheel hydraulic motors connect
Connect, P hydraulic fluid ports and Q the hydraulic fluid ports connection corresponding with the A hydraulic fluid ports of two front-wheel hydraulic motors respectively of flow divider；The H oil of the control valve
Mouth is connected with slippage pump oil-out, and the G hydraulic fluid ports of the control valve are connected with fuel tank, and two front-wheel hydraulic motors are used for high low speed work
Make the S hydraulic fluid ports of discharge capacity switching control while be connected with the N hydraulic fluid ports of Speed Switch Valve, the K hydraulic fluid ports and M hydraulic fluid ports of Speed Switch Valve are corresponding
It is connected with fuel tank and slippage pump oil-out, N hydraulic fluid ports and the K hydraulic fluid ports or M hydraulic fluid ports of Speed Switch Valve select a conducting；The state switching
The U hydraulic fluid ports of valve are connected with wheel motor oil return T hydraulic fluid ports before two simultaneously, and the V hydraulic fluid ports of state switching valve are through pressure-reducing valve and repairing pump discharge
Connection, W hydraulic fluid ports are connected with fuel tank, and U hydraulic fluid ports and the V hydraulic fluid ports or W hydraulic fluid ports of state switching valve select a conducting.
4. the front wheel driven hydraulic system of land leveller according to claim 3, it is characterised in that the flow divider includes electricity
Magnetic switch valve, pilot operated directional control valve, etc. connected than flow divider, pressure-reducing valve, the T hydraulic fluid ports of the flow divider with fuel tank；The electromagnetism is opened
Close valve to be connected between the hydraulic control end of the pilot operated directional control valve and T hydraulic fluid ports, the pressure-reducing valve is connected to the pilot operated directional control valve
Between hydraulic control end and the J hydraulic fluid ports of flow divider, the pilot operated directional control valve has J1 hydraulic fluid ports be connected with J hydraulic fluid ports and the score such as described
The J2 hydraulic fluid ports of the J3 hydraulic fluid ports connection of stream valve, the P1 hydraulic fluid ports and Q1 hydraulic fluid ports correspondingly connected with the P hydraulic fluid ports and Q hydraulic fluid ports of the flow divider；
The grade is made up of than flow divider two identical choke valves, one end of two choke valves with the grade ratio flow divider
J3 hydraulic fluid ports are connected, and the other end of two choke valves is corresponding to be connected with the P hydraulic fluid ports and Q hydraulic fluid ports of the flow divider；The J hydraulic fluid ports of flow divider
Connected with the J1 hydraulic fluid ports of the pilot operated directional control valve, its J1 hydraulic fluid port is led with J2 hydraulic fluid ports when the pilot operated directional control valve is in the first working position
Logical, its J1 hydraulic fluid port turns on J2 hydraulic fluid ports, P1 hydraulic fluid ports, Q1 hydraulic fluid ports when the pilot operated directional control valve is in the second working position；The shunting
Choke valve is connected between the P hydraulic fluid ports and Q hydraulic fluid ports of valve.
5. the front wheel driven hydraulic system of land leveller according to claim 4, it is characterised in that also include being used to control institute
State the controller of driving pump discharge, be connected to detect the speed probe of land leveller rear wheel rotation speed, the speed with controller
Switching valve and the state switching valve are magnetic valve, and the Speed Switch Valve, the state switching valve, the 3-position 4-way change
Connected to the magnet coil of valve and electromagnetic switch valve with the corresponding output end of the controller, the controller is according to land leveller
Rear wheel rotation speed controls the discharge capacity of the transfer tube to make front wheel rotation speed equal with the rear wheel rotation speed of land leveller.
6. the front wheel driven hydraulic system of land leveller according to claim 5, it is characterised in that also include connecting with controller
The shift signal input unit connect, when land leveller gear is in high gear, the controller output current makes Speed Switch Valve
M hydraulic fluid ports turned on N hydraulic fluid ports.
7. the front wheel driven hydraulic system of land leveller according to claim 5, it is characterised in that also include connecting with controller
The front-wheel mode of operation input unit connect, the both ends magnet coil of three position four-way directional control valve are connected with controller, the controller
Three kinds of output states according to the front-wheel mode of operation input unit, which correspond to output current, makes 3-position 4-way in the control valve
Reversal valve is in left position, middle position and right position.
8. the front wheel driven hydraulic system of land leveller according to claim 5, it is characterised in that also include connecting with controller
The front-wheel steer induction installation connect, the magnet coil of electromagnetic switch valve are connected with controller, and the controller is according to the front-wheel
Output control electric current opens the electromagnetism respectively for front-wheel steer state and front-wheel straight-going state detected by steering induction installation
Pass valve is on or cut-off state.
9. the front wheel driven hydraulic system of the land leveller according to any one of claim 3 to 8, it is characterised in that also include
Two-way oil compensation valve, its oil-out is corresponding to be connected with two hydraulic fluid ports of the transfer tube, the oil-out of oil inlet and the slippage pump
Connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710598457.0A CN107448425A (en) | 2017-07-21 | 2017-07-21 | Control valve and land leveller front wheel driven hydraulic system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710598457.0A CN107448425A (en) | 2017-07-21 | 2017-07-21 | Control valve and land leveller front wheel driven hydraulic system |
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| CN107448425A true CN107448425A (en) | 2017-12-08 |
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| CN201710598457.0A Pending CN107448425A (en) | 2017-07-21 | 2017-07-21 | Control valve and land leveller front wheel driven hydraulic system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108006220A (en) * | 2017-12-30 | 2018-05-08 | 江苏天明特种车辆有限公司 | Pneumatic hydraulic speed control system |
| CN110043523A (en) * | 2018-01-17 | 2019-07-23 | 雷沃重工股份有限公司 | Prevent that being emptied hydraulic system and hydraulic system prevents being emptied method |
| CN110439871A (en) * | 2019-08-09 | 2019-11-12 | 山东临工工程机械有限公司 | A kind of front-wheel assistant drive system, control method and engineering truck |
| CN110744999A (en) * | 2019-10-28 | 2020-02-04 | 韩国昊 | Hydraulic differential control system for vehicle |
| CN111677029A (en) * | 2020-06-03 | 2020-09-18 | 徐州徐工筑路机械有限公司 | Front wheel auxiliary drive electro-hydraulic control system of land leveler and land leveler |
| CN112042621A (en) * | 2020-08-31 | 2020-12-08 | 石河子大学 | Hydraulic drive walking sprayer |
| CN114508514A (en) * | 2022-01-29 | 2022-05-17 | 徐州徐工筑路机械有限公司 | Land leveler multi-rotary-motor control hydraulic system and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111677029A (en) * | 2020-06-03 | 2020-09-18 | 徐州徐工筑路机械有限公司 | Front wheel auxiliary drive electro-hydraulic control system of land leveler and land leveler |
| CN112042621A (en) * | 2020-08-31 | 2020-12-08 | 石河子大学 | Hydraulic drive walking sprayer |
| CN112042621B (en) * | 2020-08-31 | 2022-07-08 | 石河子大学 | Hydraulic drive walking sprayer |
| CN114508514A (en) * | 2022-01-29 | 2022-05-17 | 徐州徐工筑路机械有限公司 | Land leveler multi-rotary-motor control hydraulic system and control method thereof |
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