CN106523446A - Hydraulic control system and paver - Google Patents
Hydraulic control system and paver Download PDFInfo
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- CN106523446A CN106523446A CN201510578112.XA CN201510578112A CN106523446A CN 106523446 A CN106523446 A CN 106523446A CN 201510578112 A CN201510578112 A CN 201510578112A CN 106523446 A CN106523446 A CN 106523446A
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Abstract
The invention relates to a hydraulic control system and a paver. The hydraulic control system is used for controlling the floating and hydraulic assistance power of an execution unit. The hydraulic control system comprises a proportional pressure reducing valve, a throttle speed adjusting unit and a first reversing valve. When the execution unit is in a floating state, two working oil cavities of the execution unit communicate with each other through the first reversing valve, and a pressure oil path supplements the two working oil cavities of the execution unit by oil through the proportional pressure reducing valve. When the execution unit needs hydraulic assistance power, the two working oil cavities of the execution unit are disconnected through the first reversing valve, and the pressure oil path supplies oil to the working oil cavity communicating with a first working oil opening through the proportional pressure reducing valve. The proportional pressure reducing valve in the hydraulic control system plays a role in oil supplementing and a role in proportional pressure adjusting when the execution unit is under the floating working condition and the hydraulic assistance power working condition, the situation that one valve has two purposes is achieved, and the hydraulic system is simplified.
Description
Technical field
The present invention relates to engineering machinery field, more particularly to a kind of hydraulic control system and paver.
Background technology
In engineering machinery field, paver is that one kind is widely used in Freeway dough-making powder
The construction equipment of the various material paving operations of layer.Wherein screed is main as one of paver
Equipment, its Main Function are that the mixing material spreaders such as bituminous concrete, stable soil are carried out
Leveling, shaping and pre-compacted.
Paver screed lifts hydraulic system to be had to paver service behaviour and pavement spread quality
Material impact.Paver paving operation process includes starting to walk, paves and parking three phases,
Paver stop and the starting stage, screed stress change can cause screed rise or under
Drop, causes road surface to produce bulge or groove, is to solve this problem, at present major part screed
Lifting hydraulic system keeps lift cylinder to be in blocking in paver parking and starting stage
To avoid screed from producing displacement.But when paver normally paves, screed is in floating type
State, lift cylinder rodless cavity and rod chamber are communicated with fuel tank, as oil tank liquid level is less than lifting
Oil cylinder installation site, lift cylinder occur emptying phenomenon, produce negative pressure, therefore in paver
Stop with starting-up process, even if lift cylinder switches to blocking by quick condition, lifted
There is negative pressure due to being emptied in oil cylinder rodless cavity or rod chamber, building pressure needs certain hour, screed
Still displacement up or down can be produced, paving concrete pavement arch camber or impression is caused, road surface is affected
Quality；Additionally, the paver screed lifting hydraulic system for adopting at present is in screed locking,
Hydraulic circuit is arranged mostly in addition to be controlled, and causes hydraulic system complicated, it is relatively costly.
The content of the invention
To overcome above technological deficiency, present invention solves the technical problem that being to provide a kind of hydraulic pressure control
System processed and paver, can simplify hydraulic system.
To solve above-mentioned technical problem, the invention provides a kind of hydraulic control system, for controlling
The floating of performance element processed and hydraulic booster, it include proportional pressure-reducing valve, throttle grverning unit with
And first reversal valve, first actuator port and the second actuator port of the first reversal valve respectively with hold
Two working oil chambers of row unit are communicated, and the oil-in and oil return opening of the first reversal valve are communicated and led to
Cross throttling speed adjustment unit to communicate with oil return circuit, oil-in and the pressure oil circuit of proportional pressure-reducing valve connect
Logical, oil-out is communicated with the first actuator port of the first reversal valve；In performance element in floating
During state, two working oil chambers of performance element are connected by the first reversal valve, pressure oil circuit
Two working oil chamber repairings of the passing ratio air relief valve to performance element；Liquid is needed in performance element
During pressure power-assisted, two working oil chambers of performance element are mutually disconnected by the first reversal valve, pressure oil
Road passing ratio air relief valve is to the working oil chamber fuel feeding communicated with the first actuator port.
Preferably, throttle grverning unit is throttle orifice or flow speed control valve.
Further, hydraulic control system also includes the oil-out and for being connected on proportional pressure-reducing valve
The first check valve between one actuator port, oil-in and the proportional pressure-reducing valve of the first check valve
Oil-out is communicated, and oil-out is communicated with the first actuator port.
Further, hydraulic control system also includes pressure transducer, the pressure measurement of pressure transducer
Point is arranged on the oil circuit between the oil-out of the first check valve and the first actuator port, and ratio subtracts
Pressure valve can change output pressure according to the pressure value of pressure transducer detection.
Further, performance element includes lift cylinder, the rod chamber and rodless cavity of lift cylinder
As performance element two working oil chambers respectively with the first actuator port and the second actuator port phase
It is logical.
Further, hydraulic control system also includes electronic check valve, the second reversal valve, decompression
Valve, one-way throttle valve and the second check valve with back pressure, the oil-in of the second reversal valve and
Oil return opening is communicated with pressure oil circuit and oil return circuit respectively, the 3rd actuator port of the second reversal valve
Communicate with the oil-out of the oil-in and the second check valve of air relief valve, the oil-out of air relief valve and
The oil-in of the second check valve is communicated with the rodless cavity of lift cylinder, and the 4th of the second reversal valve the
Actuator port is communicated with the first hydraulic fluid port of one-way throttle valve, the second hydraulic fluid port and the electricity of one-way throttle valve
The oil-in of dynamic check valve is communicated, the oil-out of electronic check valve and the rod chamber phase of lift cylinder
It is logical；When lift cylinder is in contraction state, pressure oil circuit is by the second reversal valve and unidirectional section
Stream rod chamber fuel feeding of the valve to lift cylinder, the rodless cavity of lift cylinder by the second check valve and
Second reversal valve is to oil return circuit oil return；When lift cylinder is in and stretches out state, pressure oil circuit
By the second reversal valve and rodless cavity fuel feeding from air relief valve to lift cylinder, lift cylinder has bar
Chamber is by electronic check valve, one-way throttle valve and the second reversal valve to oil return circuit oil return；
When lift cylinder is in blocking, pressure oil circuit passes through the second reversal valve and air relief valve to lifting
The rodless cavity fuel feeding of oil cylinder, the rod chamber of the unidirectional locked lift cylinder of electronic check valve.
Preferably, three-position four-way electromagnetic directional valve or three of second reversal valve for middle position N-type function
Position four-way hydraulicchange-over valve.
The present invention still further provides a kind of paver, and the paver has above-mentioned hydraulic pressure control
System processed.
Further, performance element includes lift cylinder, the rod chamber and rodless cavity of lift cylinder
As performance element two working oil chambers respectively with the first actuator port and the second actuator port phase
Logical, the piston rod of lift cylinder connects the large arm of the paver to lift or reduce pressing for paver
Flat board.
Thus, based on above-mentioned technical proposal, the invention provides a kind of hydraulic control system, should
Hydraulic control system, is held when performance element is in quick condition by Set scale air relief valve
Two working oil chambers of row unit are connected by the first reversal valve, and throttle grverning unit is in oil return
System back pressure, two works of the pressure oil circuit passing ratio air relief valve to performance element are formed on oil circuit
Make oil pocket repairing, the return line of two working oil chamber connections has back pressure, two working oil chambers
Certain malleation is formed, is prevented performance element from occurring emptying phenomenon in location free procedure and is produced negative pressure,
Performance element has been reduced or eliminated to produce displacement when stopping operation and affect operation quality；Holding
When row unit needs hydraulic booster, two working oil chambers of performance element pass through the first reversal valve phase
Disconnect, pressure oil circuit passing ratio air relief valve is carried to the working oil chamber communicated with the first actuator port
For required pressure oil, it is ensured that operation quality；Therefore the ratio in hydraulic control system of the present invention
Example air relief valve floats in performance element and each serve as repairing and ratio pressure regulation with hydraulic booster operating mode
Effect, it is dual-purpose to realize a valve, simplifies hydraulic system.The paver that the present invention is provided is corresponding
Ground also has above-mentioned beneficial technique effect.
Description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the application
A part, the present invention schematic description and description be only used for explain the present invention, not
Constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the hydraulic schematic diagram of one embodiment of hydraulic control system of the present invention.
Specific embodiment
Below by drawings and Examples, technical scheme is done and is further retouched in detail
State.
The specific embodiment of the present invention is for the ease of the design to the present invention, the skill for being solved
Art problem, the technical characteristic of composition technical scheme and the technique effect for bringing have further
It is bright.It should be noted that for the explanation of these embodiments does not constitute the limit to the present invention
It is fixed.As long as additionally, the technical characteristic being related in the embodiment of present invention described below is each other
Between do not constitute conflict can just be mutually combined.
In describing the invention, it is to be understood that term " " center ", " longitudinal direction ",
" horizontal ", "front", "rear", "left", "right", " vertical ", " level ",
The orientation or position relationship of the instruction such as " top ", " bottom ", " interior ", " outward " is based on attached
Orientation or position relationship shown in figure, is for only for ease of the description present invention and simplifies description, and
It is not to indicate or imply that the device or element of indication must be with specific orientation, with specific side
Position construction and operation, therefore it is not intended that limiting the scope of the invention.
Due to existing paver, in paving process, screed can produce position up or down
Move, cause road surface arch camber or impression occur, and hydraulic system is complicated, manufacturing cost is high, this
Invention devises a kind of hydraulic control system, and the hydraulic control system passes through Set scale air relief valve,
When performance element is in quick condition, pressure oil circuit passing ratio air relief valve is to performance element
Two working oil chamber repairings, the return line of two working oil chamber connections have back pressure, two works
Certain malleation is formed as oil pocket, occurs emptying phenomenon generation in preventing performance element location free procedure negative
Pressure, has been reduced or eliminated performance element and has produced displacement when stopping operation and affect operation quality；
When performance element needs hydraulic booster, pressure oil circuit passing ratio air relief valve to first work
The working oil chamber that hydraulic fluid port is communicated provides required pressure oil, it is ensured that operation quality；Liquid of the present invention
Proportional pressure-reducing valve in pressure control system is floated and is risen under hydraulic booster operating mode respectively in performance element
Act on to repairing and ratio pressure regulation, it is dual-purpose to realize a valve, simplifies hydraulic system.
In a schematic embodiment of hydraulic control system of the present invention, as shown in figure 1,
The hydraulic control system is used for floating and the hydraulic booster for controlling performance element, and which includes that ratio subtracts
Pressure valve 4, throttle grverning unit 3 and the first reversal valve 7, the first reversal valve 7 are preferably two
The solenoid directional control valve or pilot operated directional control valve of four-way.First actuator port A1 of the first reversal valve 7
Communicated with two working oil chambers of performance element with the second actuator port B1 respectively, the first commutation
The oil inlet P 1 and oil return inlet T 1 of valve 7 is communicated and by throttle grverning unit 3 and oil return circuit
T-phase is led to, and the oil-in of proportional pressure-reducing valve 4 is connected with pressure oil circuit P, and oil-out is changed with first
Communicate to the first actuator port A1 of valve 7；
When performance element is in quick condition, two working oil chambers of performance element pass through first
Reversal valve 7 is connected, two works of the pressure oil circuit P passing ratios air relief valve 4 to performance element
Make oil pocket repairing；
When performance element needs hydraulic booster, two working oil chambers of performance element pass through first
Reversal valve 7 mutually disconnects, pressure oil circuit P passing ratios air relief valve 4 to the first actuator port
The working oil chamber fuel feeding that A1 is communicated.
In the schematic embodiment, by Set scale air relief valve 4, at performance element
When quick condition, the first actuator port A1 of the first reversal valve 7 and oil inlet P 1 are communicated,
Second actuator port B1 and oil return inlet T 1 are communicated, and oil inlet P 1 and oil return inlet T 1 are communicated,
Two working oil chambers of performance element are connected by the first reversal valve 7, throttle grverning unit 3
Form system back pressure on oil return circuit, pressure oil circuit P passing ratios air relief valve 4 is to performing list
Two working oil chamber repairings of unit, the return line of two working oil chambers connection have a back pressure, and two
Individual working oil chamber forms certain malleation, prevents performance element from occurring emptying phenomenon in location free procedure
Negative pressure is produced, and performance element has been reduced or eliminated and displacement has been produced when stopping operation and affects operation
Quality；When performance element needs hydraulic booster, the first actuator port A1 of the first reversal valve 7
Disconnect with oil inlet P 1, the second actuator port B1 and oil return inlet T 1 disconnect, performance element
Two working oil chambers are mutually disconnected by the first reversal valve 7, pressure oil circuit P passing ratio air relief valve
4 provide required pressure oil to the working oil chamber communicated with the first actuator port A1, it is ensured that make
Industry quality；Therefore the proportional pressure-reducing valve 4 in the present embodiment floats and hydraulic booster in performance element
Repairing and ratio pressure regulation effect are each served as under operating mode, it is dual-purpose to realize a valve, simplifies hydraulic pressure
System.Wherein, throttle grverning unit 3 is preferably throttle orifice or flow speed control valve, throttle orifice and speed governing
Valve is conventional throttle grverning mechanism, it is easy to obtained, and saves manufacturing cost, certain throttle grverning
Unit can also be selected overflow valve or air relief valve to replace.
As the improvement to above-described embodiment, as shown in figure 1, hydraulic control system also includes string
The first check valve 5 being associated between the oil-out of proportional pressure-reducing valve 4 and the first actuator port A1,
The oil-in of the first check valve 5 is communicated with the oil-out of proportional pressure-reducing valve 4, oil-out and first
Actuator port A1 is communicated.First check valve 5 is prevented from pressure oil and flows to proportional pressure-reducing valve 4,
Avoid proportional pressure-reducing valve 4 from being disturbed by other oil circuits, protect proportional pressure-reducing valve 4.Further
Ground, hydraulic control system also include pressure transducer 6, and the pressure tap of pressure transducer 6 is arranged
On oil circuit between the oil-out and the first actuator port A1 of the first check valve 5, ratio subtracts
Pressure valve 4 can change output pressure according to the pressure value of the detection of pressure transducer 6.Pressure is passed
The pressure tap of sensor 6 be arranged on the oil-out of the first check valve 5 and the first actuator port A1 it
Between oil circuit on, pressure transducer 6 is capable of the output pressure of accurate detection ratio air relief valve 4,
And then the output of proportional pressure-reducing valve 4 can be changed according to the pressure value of the detection of pressure transducer 6
Pressure is meeting the pressure demand of different operating modes.
The hydraulic control system of above-described embodiment is particularly suited for the control of paver screed, such as
Shown in Fig. 1, performance element includes lift cylinder 1 and 13, and lift cylinder 1 and 13 has bar
Chamber and rodless cavity as performance element two working oil chambers respectively with the first actuator port A1 and
Second actuator port B1 is communicated, and the piston rod of lift cylinder 1 and 13 connects the large arm of paver
To lift or reduce the screed of paver, when screed is in quick condition, passing ratio
Rod chamber and rodless cavity repairing of the air relief valve 4 to lift cylinder 1 and 13, and in oil return circuit T
Upper setting throttle grverning unit 3, sets up certain back pressure, carries during preventing ironing-board float
There is emptying phenomenon and produces negative pressure in oil-lifting jar 1 and 13, and paver stop-start mistake is reduced or eliminated
In journey, lift cylinder 1 and 13 produces displacement and causes impression and the arch camber on road surface；The hydraulic control
Proportional pressure-reducing valve 4 in system simultaneously can be when hydraulic booster be provided to screed to lifting oil
Cylinder 1 and 13 rod chamber pressure carry out proportion adjustment, make screed equivalent weight and laminated material phase
Adapt to, it is ensured that paving thickness, it is dual-purpose to realize a valve, simplifies hydraulic system.Certainly, on
The hydraulic control system for stating embodiment can be applied in Other Engineering mechanically, and here is not one by one
Enumerate.
Further, so that the hydraulic control system of above-described embodiment is applied to paver as an example, liquid
Pressure control system also includes electronic check valve 2 and the 12, second reversal valve 8, air relief valve 9, list
The second check valve 10 to choke valve 11 and with back pressure, during the second reversal valve 8 is preferably
The three-position four-way electromagnetic directional valve or 3-position 4-way hydraulicchange-over valve of position N-type function, the second commutation
The oil inlet P 2 and oil return inlet T 2 of valve 8 is logical with pressure oil circuit P and oil return circuit T-phase respectively,
3rd actuator port A2 of the second reversal valve 8 and the oil-in of air relief valve 9 and the second check valve
10 oil-out is communicated, and the oil-in of the oil-out of air relief valve 9 and the second check valve 10 is equal
Communicate with the rodless cavity of lift cylinder 1,13, the 4th actuator port B2 of the second reversal valve 8
Communicate with the first hydraulic fluid port of one-way throttle valve 11, the second hydraulic fluid port of one-way throttle valve 11 with it is electronic
The oil-in of check valve 2 and 12 is communicated, wherein, one-way throttle valve 11 includes what is be connected in parallel
3rd check valve 11-1 and choke valve 11-2, it should be noted that the of one-way throttle valve 11
One hydraulic fluid port is communicated with the oil-in of the 3rd check valve 11-1, the second hydraulic fluid port and the 3rd check valve 11-1
Oil-out communicate, the oil-out of electronic check valve 2 and 12 and having for lift cylinder 1 and 13
Rod cavity is communicated；
When lift cylinder 1 and 13 is in contraction state, the oil inlet P 2 of the second reversal valve 8
Communicate with the 4th actuator port B2, oil return inlet T 2 and the 3rd actuator port A2 are communicated, pressure
Oil circuit P is by the 3rd check valve 11-1 in the second reversal valve 8 and one-way throttle valve 11 to carrying
The rod chamber fuel feeding of oil-lifting jar 1 and 13, the rodless cavity of lift cylinder 1 and 13 are single by second
To valve 10 and the second reversal valve 8 to oil return circuit T oil returns, the second check valve 10 is provided with necessarily
Back pressure, it is ensured that lift cylinder 1 and 13 is steady to be shunk；
When lift cylinder 1 and 13 is in and stretches out state, the oil inlet P 2 of the second reversal valve 8
Communicate with the 3rd actuator port A2, oil return inlet T 2 and the 4th actuator port B2 are communicated, pressure
Oil circuit P passes through the second reversal valve 8 and air relief valve 9 and supplies to the rodless cavity of lift cylinder 1 and 13
Oil, the rod chamber of lift cylinder 1 and 13 pass through electronic check valve 2 and 12, one-way throttle valve
Choke valve 11-2 and the second reversal valve 8 in 11 is to oil return circuit T oil returns, choke valve 11-2
Form certain back pressure, it is ensured that lift cylinder 1 and 13 steadily stretches out；
When lift cylinder 1 and 13 is in blocking, pressure oil circuit P is by the second commutation
The rodless cavity fuel feeding of valve 8 and air relief valve 9 to lift cylinder 1 and 13, lift cylinder 1 and 13
Rodless cavity keep certain pressure value, rodless cavity is locked, it is to avoid lift cylinder 1 and 13 shrinks,
The rod chamber of 2 and 12 unidirectional locked lift cylinder 1 and 13 of electronic check valve, prevents from lifting oil
Cylinder 1 and 13 stretches out.
The embodiment of the hydraulic control system on the premise of not setting up and setting new oil circuit, by with
On the oil circuit of lift cylinder rodless cavity connection, air relief valve 9 and the second check valve 10 are set in parallel,
Can be achieved with lift cylinder 1 and 13 rodless cavity oil return, rodless cavity repairing when stretching out when shrinking
And rodless cavity is locked in locking, further so that hydraulic control system configuration is simple, tight
Gather.
The present invention still further provides a kind of paver, and which has the hydraulic pressure control of above-described embodiment
System processed.Due to the proportional pressure-reducing valve in hydraulic control system of the present invention performance element float and
Repairing and ratio pressure regulation effect are each served as under hydraulic booster operating mode, it is dual-purpose to realize a valve, letter
Hydraulic system is changed, correspondingly, paver of the present invention also has above-mentioned beneficial technique effect.
Specifically, paver has large arm and screed, as shown in figure 1, performance element bag
Include lift cylinder 1 and 13, the rod chamber and rodless cavity of lift cylinder 1 and 13 are used as performing list
Two working oil chambers of unit are communicated with the first actuator port A1 and the second actuator port B1 respectively,
The piston rod of lift cylinder 1 and 13 connects the large arm of paver to lift or reduce pressing for paver
Flat board, when the piston rod of lift cylinder 1 and 13 shrinks upwards, screed is lifted；Work as lifting
When the piston rod of oil cylinder 1 and 13 is extended downwardly from, screed declines.
Thus, the work of hydraulic control system under different operating modes of one embodiment of paver of the present invention
Make principle as follows：
When paver screed is lifted, the electric magnet Y1.1 energizations of the second reversal valve 8, Y1.2
No power, the electric magnet Y2.1 and Y2.2 of electronic check valve 2 and 12, proportional pressure-reducing valve 4
The equal no powers of electric magnet Y3 of electric magnet m1, the first reversal valve 7, the high pressure of oil feeding line P
Oil is by the oil inlet P 2 of the second reversal valve 8 to the 4th actuator port B2 Jing check valve 11-1, electricity
Dynamic check valve 2 and 12 respectively enters the rod chamber of lift cylinder 1 and 13,1 He of lift cylinder
13 rodless cavity is connected with the 3rd actuator port A2 of the second reversal valve 8 by check valve 10
Logical, the 3rd actuator port A2 Jing oil return inlet Ts 2 and the oil return circuit T-phase of the second reversal valve 8 connect
Logical, the rod chamber of lift cylinder 1 and 13 is hydraulic oil, and rodless cavity is low pressure oil, screed to
Upper lifting, wherein check valve 10 set certain back pressure, it is ensured that screed is steadily lifted up.
When paver screed declines, the electric magnet Y1.2 energizations of the second reversal valve 8, Y1.1
No power, the electric magnet Y2.1 and Y2.2 of electronic check valve 2 and 12 are powered, proportional pressure-reducing valve
The equal no powers of electric magnet Y3 of 4 electric magnet m1 and the first reversal valve 7,1 He of lift cylinder
13 rod chamber is connected with choke valve 11-2 by electronic check valve 2 and 12, choke valve 11-2
Connected with oil return circuit T-phase by the 4th actuator port B2 Jing oil return inlet Ts 2 of the second reversal valve 8,
Screed declines under Gravitative Loads, and choke valve 11-2 forms certain back pressure, and control screed is put down
Steady to decline, the oil inlet P 2 of second reversal valves of pressure oil Jing 8 of oil feeding line P is to the 3rd work
Make hydraulic fluid port A2, then by rodless cavity repairing from air relief valve 9 to lift cylinder 1 and 13.
In paver normal operation, screed is in quick condition, the electricity of the second reversal valve 8
The equal no powers of Magnet Y1.1 and Y1.2, the electric magnet Y2.1 and Y2.2 of electronic check valve 2 and 12,
The electric magnet Y3 of the first reversal valve 7 is powered, the electric magnet m1 of proportional pressure-reducing valve 4 according to by
The pressure requirements of the monitoring of pressure transducer 6 give corresponding current value, and the first reversal valve 7 will
Lift cylinder 1 is connected with rodless cavity with 13 rod chamber, and passes through throttle grverning unit 3
Connect with oil return circuit T-phase, the pressure oil of oil feeding line P is through proportional pressure-reducing valve 4 and first
Check valve 5, in the presence of electronic check valve 2 and 12 respectively with lift cylinder 1 and 13
Rod chamber and rodless cavity are communicated, and during ironing-board float, proportional pressure-reducing valve 4 can be with one
Rod chamber and rodless cavity repairing of the level pressure force value to lift cylinder 1 and 13, throttle grverning unit 3
Certain back pressure is set up, is prevented the lift cylinder during ironing-board float from going out 1 and 13 and is occurred being emptied
Phenomenon produces negative pressure, and lift cylinder 1 and 13 during paver stop-start is reduced or eliminated
Produce displacement and cause impression and the arch camber on road surface.
When paver screed needs to provide hydraulic booster, the electric magnet of the first reversal valve 7
The equal no power of electric magnet Y1.1 and Y1.2 of Y3, the second reversal valve 8,2 He of electronic check valve
12 electric magnet Y2.1 and Y2.2 are powered, and the electric magnet m1 of proportional pressure-reducing valve 4 is according to by pressing
The pressure requirements of the monitoring of force transducer 6 give corresponding current value, the pressure of oil feeding line P
It is oily to pass through the first check valve 5, electronic check valve 2 and 12 Jing after proportional pressure-reducing valve 4 adjusts pressure
Into the rod chamber of lift cylinder 1 and 13, the rod chamber of lift cylinder 1 and 13 is remained
The rodless cavity of the pressure value being adapted with laminated material, lift cylinder 1 and lift cylinder 13 is passed through
Second check valve 10, the second reversal valve 8 the 3rd actuator port A2 to 2 mouthfuls of oil return inlet T with
Oil return circuit T-phase is connected, and lift cylinder 1 and 13 makes screed by power upwards, mitigates
Screed weight, it is ensured that paving thickness.
In paver screed locking, the electric magnet Y1.1 no powers of the second reversal valve 8,
Y1.2 is powered, the electric magnet Y3 of the first reversal valve 7, the electric magnet of electronic check valve 2 and 12
The equal no powers of electric magnet m1 of Y2.1 and Y2.2, proportional pressure-reducing valve 4,2 He of electronic check valve
12 will be the fluid of the rod chamber of lift cylinder 1 and 13 locked, prevents screed from declining, fuel feeding
The pressure oil of oil circuit P Jing after the second reversal valve 8 and air relief valve 9 reduce pressure with lift cylinder 1 and 13
Rodless cavity be connected, lift cylinder 1 and 13 rodless cavities keep certain pressure value, it is to avoid screed
It is lifted up.
Above in association with embodiment embodiments of the present invention are described in detail, but this
It is bright to be not limited to described embodiment.For example electronic check valve 2 and 12 can also use hydraulic control
Check valve replaces.For a person skilled in the art, without departing from the present invention principle and
These embodiments are carried out in the case of connotation various changes, modification, equivalence replacement and
Modification is still fallen within protection scope of the present invention.
Claims (9)
1. a kind of hydraulic control system, for controlling floating and the hydraulic booster of performance element, its
It is characterised by, including proportional pressure-reducing valve (4), throttle grverning unit (3) and the first commutation
Valve (7), first actuator port (A1) and the second working oil of first reversal valve (7)
Mouth (B1) is communicated with two working oil chambers of the performance element respectively, first reversal valve
(7) oil-in (P1) and oil return opening (T1) is communicated and by the throttle grverning unit
(3) communicate with oil return circuit (T), the oil-in and pressure of the proportional pressure-reducing valve (4)
Oil circuit (P) is connected, first actuator port (A1) of oil-out and first reversal valve (7)
Communicate；
When the performance element is in quick condition, two working oil chambers of the performance element
It is connected by first reversal valve (7), pressure oil circuit (P) the passing ratio decompression
Two working oil chamber repairings of the valve (4) to the performance element；
When the performance element needs hydraulic booster, two working oil chambers of the performance element
Mutually disconnected by first reversal valve (7), the pressure oil circuit (P) is by the ratio
Air relief valve (4) is to the working oil chamber fuel feeding communicated with first actuator port (A1).
2. hydraulic control system according to claim 1, it is characterised in that throttle grverning
Unit (3) is throttle orifice or flow speed control valve.
3. hydraulic control system according to claim 1, it is characterised in that also including string
It is associated between the oil-out of the proportional pressure-reducing valve (4) and first actuator port (A1)
The first check valve (5), the oil-in of first check valve (5) and the ratio decompression
The oil-out of valve (4) is communicated, and oil-out is communicated with first actuator port (A1).
4. hydraulic control system according to claim 3, it is characterised in that also including pressure
Force transducer (6), it is unidirectional that the pressure tap of the pressure transducer (6) is arranged on described first
On oil circuit between the oil-out of valve (5) and first actuator port (A1), the ratio
Example air relief valve (4) can change output according to the pressure value that the pressure transducer (6) are detected
Pressure.
5. the hydraulic control system according to any one of Claims 1 to 4, it is characterised in that
The performance element includes lift cylinder (1,13), and lift cylinder (1,13) have
Rod cavity and rodless cavity are worked with described first respectively as two working oil chambers of the performance element
Hydraulic fluid port (A1) and second actuator port (B1) are communicated.
6. hydraulic control system according to claim 5, it is characterised in that also including electricity
Dynamic check valve (2,12), the second reversal valve (8), air relief valve (9), one-way throttle valve (11)
And the second check valve (10) with back pressure, the oil-in (P2) of second reversal valve (8)
Communicated with the pressure oil circuit (P) and the oil return circuit (T) with oil return opening (T2) respectively,
3rd actuator port (A2) of second reversal valve (8) is entered with the air relief valve (9)
The oil-out of hydraulic fluid port and second check valve (10) communicates, and air relief valve (9) go out
The oil-in of hydraulic fluid port and second check valve (10) with the lift cylinder (1,13)
Rodless cavity is communicated, the 4th actuator port (B2) and the list of second reversal valve (8)
The first hydraulic fluid port to choke valve (11) is communicated, the second hydraulic fluid port of the one-way throttle valve (11)
Communicate with the oil-in of the electronic check valve (2,12), the electronic check valve (2,12)
Oil-out communicate with the rod chamber of the lift cylinder (1,13)；
When the lift cylinder (1,13) is in contraction state, the pressure oil circuit (P)
By second reversal valve (8) and the one-way throttle valve (11) to the lift cylinder (1,
13) rod chamber fuel feeding, the rodless cavity of the lift cylinder (1,13) are single by described second
To valve (10) and second reversal valve (8) to the oil return circuit (T) oil return；
The lift cylinder (1,13) in stretch out state when, the pressure oil circuit (P)
By second reversal valve (8) and the air relief valve (9) to the lift cylinder (1,13)
Rodless cavity fuel feeding, the rod chamber of the lift cylinder (1,13) passes through the electronic check valve
(2,12), the one-way throttle valve (11) and second reversal valve (8) are to described
Oil return circuit (T) oil return；
When the lift cylinder (1,13) is in blocking, the pressure oil circuit (P)
By second reversal valve (8) and the air relief valve (9) to the lift cylinder (1,13)
Rodless cavity fuel feeding, the unidirectional locked lift cylinder of the electronic check valve (2,12) (1,
13) rod chamber.
7. hydraulic control system according to claim 6, it is characterised in that described second
Reversal valve (8) surges for the three-position four-way electromagnetic directional valve or 3-position 4-way of middle position N-type function
Reversal valve.
8. a kind of paver, it is characterised in that with the liquid described in any one of claim 1～7
Pressure control system.
9. paver according to claim 8, it is characterised in that the performance element bag
Lift cylinder (1,13) is included, the rod chamber of the lift cylinder (1,13) and rodless cavity are made
For the performance element two working oil chambers respectively with first actuator port (A1) and institute
State the second actuator port (B1) to communicate, the piston rod connection of the lift cylinder (1,13)
The large arm of the paver is lifting or reduce the screed of the paver.
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| CN201510578112.XA CN106523446B (en) | 2015-09-11 | 2015-09-11 | hydraulic control system and paver |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510578112.XA CN106523446B (en) | 2015-09-11 | 2015-09-11 | hydraulic control system and paver |
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| CN106523446A true CN106523446A (en) | 2017-03-22 |
| CN106523446B CN106523446B (en) | 2018-08-14 |
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| CN205047552U (en) * | 2015-09-11 | 2016-02-24 | 徐工集团工程机械股份有限公司 | Hydraulic control system and paver |
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| JP2000351574A (en) * | 1999-06-14 | 2000-12-19 | Ishikawajima Harima Heavy Ind Co Ltd | Hydraulic pressure generation device |
| CN2763341Y (en) * | 2004-12-08 | 2006-03-08 | 常林股份有限公司 | Floating and sinking-resisting device for ironing-levelling board of spreader |
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|---|---|
| CN106523446B (en) | 2018-08-14 |
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