CN106523446B - hydraulic control system and paver - Google Patents
hydraulic control system and paver Download PDFInfo
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- CN106523446B CN106523446B CN201510578112.XA CN201510578112A CN106523446B CN 106523446 B CN106523446 B CN 106523446B CN 201510578112 A CN201510578112 A CN 201510578112A CN 106523446 B CN106523446 B CN 106523446B
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Abstract
The present invention relates to a kind of hydraulic control system and pavers, wherein, floating and hydraulic booster of the hydraulic control system for control execution unit, it includes proportional pressure-reducing valve, throttle grverning unit and the first reversal valve, when execution unit is in quick condition, two working oil chambers of execution unit are connected by the first reversal valve, two working oil chamber repairings of the pressure oil circuit by proportional pressure-reducing valve to execution unit；When execution unit needs hydraulic booster, two working oil chambers of execution unit are mutually disconnected by the first reversal valve, and pressure oil circuit is by proportional pressure-reducing valve to the working oil chamber fuel feeding communicated with the first actuator port.Proportional pressure-reducing valve in hydraulic control system of the present invention execution unit float and hydraulic booster operating mode under each serve as repairing and ratio pressure regulation effect, it is dual-purpose to realize a valve, simplifies hydraulic system.
Description
Technical field
The present invention relates to engineering machinery field more particularly to a kind of hydraulic control system and pavers.
Background technology
In engineering machinery field, paver is that one kind being widely used in Freeway knead dough layer a variety of materials and paves
The construction equipment of operation.A wherein groundwork device of the screed as paver, main function is to pitch coagulation
Soil, stablize the mixing material spreader such as soil flattened, shaping and pre-compacted.
Paver screed promotes hydraulic system and is had a major impact to paver working performance and pavement spread quality.It paves
Machine paving operation process includes starting, paves and the three phases that stops, and in paver parking and starting stage, screed stress is sent out
Changing can cause screed to rise or fall, and road surface is caused to generate bulge or groove, to solve this problem, most of at present
Screed promotes hydraulic system and keeps lift cylinder to be in blocking to avoid ironing in paver parking and starting stage
Plate generates displacement.But when paver normally paves, screed is in quick condition, lift cylinder rodless cavity and rod chamber with
Fuel tank communicates, and since oil tank liquid level is less than lift cylinder installation site, lift cylinder will appear emptying phenomenon, generate negative pressure, because
This is in paver parking and starting-up process, even if lift cylinder switches to blocking by quick condition, lift cylinder is without bar
Chamber or rod chamber build pressure and need certain time due to being emptied there are negative pressure, and screed still will produce displacement upward or downward,
Paving concrete pavement arch camber or impression are caused, pavement quality is influenced；Exist in addition, the paver screed used at present promotes hydraulic system
When screed is latched, in addition setting hydraulic circuit is controlled mostly, causes hydraulic system complicated, cost is higher.
Invention content
To overcome the above technological deficiency, the technical problem to be solved by the present invention is to provide a kind of hydraulic control system and pave
Machine can simplify hydraulic system.
In order to solve the above technical problems, the present invention provides a kind of hydraulic control system, for the floating of control execution unit
Dynamic and hydraulic booster comprising proportional pressure-reducing valve, throttle grverning unit and the first reversal valve, the first work of the first reversal valve
Hydraulic fluid port and the second actuator port are communicated with two working oil chambers of execution unit respectively, the oil inlet and oil return opening of the first reversal valve
It communicates and is communicated with oil return circuit by throttle grverning unit, oil inlet and the pressure oil communication of proportional pressure-reducing valve, oil outlet
It is communicated with the first actuator port of the first reversal valve；When execution unit is in quick condition, two working oils of execution unit
Chamber is connected by the first reversal valve, two working oil chamber repairings of the pressure oil circuit by proportional pressure-reducing valve to execution unit；
When execution unit needs hydraulic booster, two working oil chambers of execution unit are mutually disconnected by the first reversal valve, and pressure oil circuit is logical
Proportional pressure-reducing valve is crossed to the working oil chamber fuel feeding communicated with the first actuator port.
Preferably, throttle grverning unit is throttle orifice or speed governing valve.
Further, hydraulic control system further includes being connected between the oil outlet of proportional pressure-reducing valve and the first actuator port
The first check valve, the oil inlet of the first check valve communicates with the oil outlet of proportional pressure-reducing valve, oil outlet and the first actuator port
It communicates.
Further, hydraulic control system further includes pressure sensor, and the pressure tap setting of pressure sensor is single first
To on the oil circuit between the oil outlet and the first actuator port of valve, proportional pressure-reducing valve can be according to the pressure of pressure sensor detection
Value changes output pressure.
Further, execution unit includes lift cylinder, and the rod chamber and rodless cavity of lift cylinder are as execution unit
Two working oil chambers are communicated with the first actuator port and the second actuator port respectively.
Further, hydraulic control system further include electronic check valve, the second reversal valve, pressure reducing valve, one-way throttle valve with
And the second check valve with back pressure, the oil inlet and oil return opening of the second reversal valve respectively with pressure oil circuit and oil return circuit phase
Logical, the third actuator port of the second reversal valve is communicated with the oil outlet of the oil inlet of pressure reducing valve and the second check valve, pressure reducing valve
Oil outlet and the oil inlet of the second check valve communicated with the rodless cavity of lift cylinder, the 4th actuator port of the second reversal valve
It is communicated with the first hydraulic fluid port of one-way throttle valve, the second hydraulic fluid port of one-way throttle valve is communicated with the oil inlet of electronic check valve, electronic
The oil outlet of check valve is communicated with the rod chamber of lift cylinder；When lift cylinder is in contraction state, pressure oil circuit passes through
To the rod chamber fuel feeding of lift cylinder, the rodless cavity of lift cylinder passes through the second check valve and for two reversal valves and one-way throttle valve
Two reversal valves are to oil return circuit oil return；When lift cylinder is in stretching state, pressure oil circuit passes through the second reversal valve and decompression
To the rodless cavity fuel feeding of lift cylinder, the rod chamber of lift cylinder changed valve by electronic check valve, one-way throttle valve and second
To valve to oil return circuit oil return；When lift cylinder is in blocking, pressure oil circuit by the second reversal valve and pressure reducing valve to
The rodless cavity fuel feeding of lift cylinder, electronic check valve unidirectionally lock the rod chamber of lift cylinder.
Preferably, the second reversal valve is that the three-position four-way electromagnetic directional valve of middle position N-type function or 3-position 4-way surge commutation
Valve.
The present invention still further provides a kind of paver, which has above-mentioned hydraulic control system.
Further, execution unit includes lift cylinder, and the rod chamber and rodless cavity of lift cylinder are as execution unit
Two working oil chambers are communicated with the first actuator port and the second actuator port respectively, and the piston rod of lift cylinder connects the paver
Large arm to promote or reduce the screed of paver.
As a result, based on the above-mentioned technical proposal, the present invention provides a kind of hydraulic control system, which passes through
Set scale pressure reducing valve, when execution unit is in quick condition, two working oil chambers of execution unit pass through the first reversal valve
It is connected, throttle grverning unit forms system back pressure on oil return circuit, and pressure oil circuit is by proportional pressure-reducing valve to execution unit
Two working oil chamber repairings, the oil return line of two working oil chambers connection has back pressure, and two working oil chambers are formed centainly just
Pressure prevents execution unit from occurring emptying phenomenon in location free procedure and generates negative pressure, and execution unit has been reduced or eliminated and has stopped making
Displacement is generated when industry and influences operation quality；When execution unit needs hydraulic booster, two working oil chambers of execution unit are logical
It crosses the first reversal valve mutually to disconnect, pressure oil circuit provides institute by proportional pressure-reducing valve to the working oil chamber communicated with the first actuator port
The pressure oil needed ensures operation quality；Therefore the proportional pressure-reducing valve in hydraulic control system of the present invention floats in execution unit
With repairing and ratio pressure regulation effect are each served as under hydraulic booster operating mode, it is dual-purpose to realize a valve, simplifies hydraulic system.This hair
The paver of bright offer correspondingly also has above-mentioned beneficial technique effect.
Description of the drawings
Attached drawing described herein is used to provide further understanding of the present invention, and is constituted part of this application, this hair
Bright illustrative embodiments and their description are only used for explaining the present invention, do not constitute improper limitations 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 implementation mode
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
The present invention specific implementation mode be for the ease of to the present invention design, it is solved the technical issues of, composition skill
The technical characteristic of art scheme and the technique effect brought have further description.It should be noted that for these embodiment party
The explanation of formula does not constitute limitation of the invention.In addition, the technology involved in the embodiment of present invention described below is special
Sign can be combined with each other as long as they do not conflict with each other.
In the description of the present invention, it is to be understood that, term "center", " longitudinal direction ", " transverse direction ", "front", "rear",
The orientation or positional relationship of the instructions such as "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is based on attached drawing institute
The orientation or positional relationship shown, is merely for convenience of description of the present invention and simplification of the description, and does not indicate or imply the indicated dress
It sets or element must have a particular orientation, with specific azimuth configuration and operation, therefore should not be understood as protecting the present invention
The limitation of range.
Since screed will produce displacement upward or downward to existing paver in paving process, road surface is caused to occur
Arch camber or impression, and hydraulic system is complicated, and manufacturing cost is high, and the present invention devises a kind of hydraulic control system, the hydraulic pressure control
System processed is by Set scale pressure reducing valve, and when execution unit is in quick condition, pressure oil circuit is by proportional pressure-reducing valve to holding
There is the oil return line of two working oil chamber repairings of row unit, the connection of two working oil chambers back pressure, two working oil chambers to be formed
Certain positive pressure prevents occurring emptying phenomenon generation negative pressure in execution unit location free procedure, execution unit has been reduced or eliminated and has stopped
Only displacement is generated when operation and influence operation quality；When execution unit needs hydraulic booster, pressure oil circuit is depressurized by ratio
Valve provides required pressure oil to the working oil chamber communicated with the first actuator port, ensures operation quality；Hydraulic pressure control of the present invention
Proportional pressure-reducing valve in system processed floats in execution unit and each serves as repairing and ratio pressure regulation effect under hydraulic booster operating mode,
It is dual-purpose to realize a valve, simplifies hydraulic system.
In a schematical embodiment of hydraulic control system of the present invention, as shown in Figure 1, the hydraulic control system is used
Floating in control execution unit and hydraulic booster comprising proportional pressure-reducing valve 4, throttle grverning unit 3 and the first reversal valve
7, the first reversal valve 7 is preferably the solenoid directional control valve or pilot operated directional control valve of two-position four-way.First actuator port of the first reversal valve 7
A1 and the second actuator port B1 is communicated with two working oil chambers of execution unit respectively, the oil inlet P 1 of the first reversal valve 7 and return
Hydraulic fluid port T1 is communicated and, oil inlet and the pressure oil circuit P company of proportional pressure-reducing valve 4 logical by throttle grverning unit 3 and oil return circuit T-phase
Logical, oil outlet is communicated with the first actuator port A1 of the first reversal valve 7；
When execution unit is in quick condition, two working oil chambers of execution unit are connected by the first reversal valve 7,
Two working oil chamber repairings of the pressure oil circuit P by proportional pressure-reducing valve 4 to execution unit；
When execution unit needs hydraulic booster, two working oil chambers of execution unit are disconnected by 7 phase of the first reversal valve,
Pressure oil circuit P is by proportional pressure-reducing valve 4 to the working oil chamber fuel feeding communicated with the first actuator port A1.
In the schematical embodiment, by Set scale pressure reducing valve 4, when execution unit is in quick condition, the
The the first actuator port A1 and oil inlet P 1 of one reversal valve 7 are communicated, and the second actuator port B1 and oil return inlet T 1 communicate, and oil inlet
P1 and oil return inlet T 1 communicate, and two working oil chambers of execution unit are connected by the first reversal valve 7, and throttle grverning unit 3 exists
Form system back pressure on oil return circuit, two working oil chamber repairings of the pressure oil circuit P by proportional pressure-reducing valve 4 to execution unit,
There is the oil return line of two working oil chambers connection back pressure, two working oil chambers to form certain positive pressure, prevent execution unit floating
Occur emptying phenomenon during dynamic and generate negative pressure, execution unit has been reduced or eliminated and has generated displacement when stopping operation and influences to make
Industry quality；When execution unit needs hydraulic booster, the first actuator port A1 and oil inlet P 1 of the first reversal valve 7 are disconnected, the
Two actuator port B1 and oil return inlet T 1 disconnect, and two working oil chambers of execution unit are disconnected by 7 phase of the first reversal valve, pressure oil
Road P provides required pressure oil by proportional pressure-reducing valve 4 to the working oil chamber communicated with the first actuator port A1, ensures operation
Quality；Therefore the proportional pressure-reducing valve 4 in the present embodiment execution unit float and hydraulic booster operating mode under each serve as repairing and
Ratio pressure regulation acts on, and it is dual-purpose to realize a valve, simplifies hydraulic system.Wherein, throttle grverning unit 3 is preferably throttle orifice or tune
Fast valve, throttle orifice and speed governing valve are the throttle grverning mechanism of routine, are easily obtained, and manufacturing cost, certain throttle grverning list are saved
Member can also select overflow valve or pressure reducing valve to replace.
As the improvement to above-described embodiment, as shown in Figure 1, hydraulic control system further includes being connected on proportional pressure-reducing valve 4
Oil outlet and the first actuator port A1 between the first check valve 5, the oil inlet of the first check valve 5 and proportional pressure-reducing valve 4
Oil outlet communicates, and oil outlet is communicated with the first actuator port A1.First check valve 5 can prevent pressure oil from flowing to proportional pressure-reducing valve
4, it avoids proportional pressure-reducing valve 4 from being interfered by other oil circuits, protects proportional pressure-reducing valve 4.Further, hydraulic control system is also wrapped
Include pressure sensor 6, the pressure tap of pressure sensor 6 be arranged the oil outlet of the first check valve 5 and the first actuator port A1 it
Between oil circuit on, proportional pressure-reducing valve 4 can according to pressure sensor 6 detect pressure value change output pressure.By pressure sensing
The pressure tap of device 6 is arranged on the oil circuit between the oil outlet and the first actuator port A1 of the first check valve 5, pressure sensor 6
It is capable of the output pressure of accurate detection ratio pressure reducing valve 4, and then ratio can be changed according to the pressure value that pressure sensor 6 detects
The output pressure of example pressure reducing valve 4 meets the pressure demand of different operating modes.
The hydraulic control system of above-described embodiment is particularly suitable for the control of paver screed, as shown in Figure 1, executing list
Member includes lift cylinder 1 and 13, and the rod chamber and rodless cavity of lift cylinder 1 and 13 divide as two working oil chambers of execution unit
It is not communicated with the first actuator port A1 and the second actuator port B1, lift cylinder 1 connects the large arm of paver with 13 piston rod
To promote or reduce the screed of paver, when screed is in quick condition, by proportional pressure-reducing valve 4 to lift cylinder 1
Rod chamber with 13 and rodless cavity repairing, and throttle grverning unit 3 is set on oil return circuit T, certain back pressure is established, is prevented
There is emptying phenomenon generation negative pressure in lift cylinder 1 and 13 during ironing-board float, and paver stop-start mistake is reduced or eliminated
Lift cylinder 1 and 13 generates displacement and causes impression and the arch camber on road surface in journey；Proportional pressure-reducing valve 4 in the hydraulic control system
Proportion adjustment can be carried out to lift cylinder 1 and 13 rod chamber pressure when providing hydraulic booster to screed simultaneously, make ironing
Plate equivalent weight and laminated material are adapted, and ensure paving thickness, and 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, numerous to list herein.
Further, by taking the hydraulic control system of above-described embodiment is applied to paver as an example, hydraulic control system is also wrapped
Electronic check valve 2 and the 12, second reversal valve 8, pressure reducing valve 9, one-way throttle valve 11 and the second check valve 10 with back pressure are included,
Second reversal valve 8 is preferably the three-position four-way electromagnetic directional valve or 3-position 4-way hydraulic directional valve of middle position N-type function, the second commutation
The oil inlet P 2 and oil return inlet T 2 of valve 8 are logical with pressure oil circuit P and oil return circuit T-phase respectively, the third working oil of the second reversal valve 8
Mouth A2 is communicated with the oil outlet of the oil inlet of pressure reducing valve 9 and the second check valve 10, the oil outlet of pressure reducing valve 9 and the second check valve
10 oil inlet is communicated with the rodless cavity of lift cylinder 1,13, the 4th actuator port B2 and one-way throttle of the second reversal valve 8
First hydraulic fluid port of valve 11 communicates, and the second hydraulic fluid port of one-way throttle valve 11 is communicated with the oil inlet of electronic check valve 2 and 12, wherein
One-way throttle valve 11 includes the third check valve 11-1 being connected in parallel and throttle valve 11-2, it should be noted that one-way throttle valve
11 the first hydraulic fluid port is communicated with the oil inlet of third check valve 11-1, the oil outlet phase of the second hydraulic fluid port and third check valve 11-1
Logical, the oil outlet of electronic check valve 2 and 12 is communicated with the rod chamber of lift cylinder 1 and 13；
When lift cylinder 1 and 13 is in contraction state, the oil inlet P 2 of the second reversal valve 8 and the 4th actuator port B2 phases
Logical, oil return inlet T 2 and third actuator port A2 are communicated, and pressure oil circuit P passes through the in the second reversal valve 8 and one-way throttle valve 11
For three check valve 11-1 to the rod chamber fuel feeding of lift cylinder 1 and 13, the rodless cavity of lift cylinder 1 and 13 passes through the second check valve 10
With the second reversal valve 8 to oil return circuit T oil returns, the second check valve 10 is equipped with certain back pressure, ensures lift cylinder 1 and 13 steady receipts
Contracting；
When lift cylinder 1 and 13 is in stretching state, the oil inlet P 2 and third actuator port A2 phases of the second reversal valve 8
Logical, oil return inlet T 2 and the 4th actuator port B2 are communicated, and pressure oil circuit P is by the second reversal valve 8 and pressure reducing valve 9 to lift cylinder 1
With 13 rodless cavity fuel feeding, the rod chamber of lift cylinder 1 and 13 passes through the section in electronic check valve 2 and 12, one-way throttle valve 11
Valve 11-2 and the second reversal valve 8 are flowed to oil return circuit T oil returns, and throttle valve 11-2 forms certain back pressure, ensures 1 He of lift cylinder
13 steady stretchings；
When lift cylinder 1 and 13 is in blocking, pressure oil circuit P is by the second reversal valve 8 and pressure reducing valve 9 to promotion
The rodless cavity of the rodless cavity fuel feeding of oil cylinder 1 and 13, lift cylinder 1 and 13 keeps certain pressure value, rodless cavity to be locked, avoid carrying
Oil-lifting jar 1 and 13 is shunk, and the rod chamber of electronic check valve 2 and 12 unidirectional locked lift cylinders 1 and 13 prevents 1 He of lift cylinder
13 stretch out.
The embodiment of the hydraulic control system do not add set new oil circuit under the premise of, by with lift cylinder rodless cavity
Pressure reducing valve 9 and the second check valve 10 are set in parallel on the oil circuit of connection, can be achieved with lift cylinder 1 and 13 when shrinking without bar
Chamber oil return, the rodless cavity repairing and rodless cavity is locked in locking when stretching out, further so that hydraulic control system configuration
Simply, compact.
The present invention still further provides a kind of paver, the hydraulic control system with above-described embodiment.Due to this
Proportional pressure-reducing valve in invention hydraulic control system floats in execution unit and each serves as repairing and ratio under hydraulic booster operating mode
Example pressure regulation effect, it is dual-purpose to realize a valve, simplifies hydraulic system, and 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, execution unit includes lift cylinder 1 and 13,
The rod chamber and rodless cavity of lift cylinder 1 and 13 as execution unit two working oil chambers respectively with the first actuator port A1 and
Second actuator port B1 is communicated, and lift cylinder 1 connects the large arm of paver with 13 piston rod to promote or reduce paver
Screed, when the piston rod of lift cylinder 1 and 13 is shunk upwards, screed is promoted；When lift cylinder 1 and 13 piston rod to
When lower stretching, screed declines.
The operation principle of hydraulic control system under different operating modes of one embodiment of paver of the present invention is as follows as a result,：
When paver screed is promoted, the electromagnet Y1.1 energizations of the second reversal valve 8, Y1.2 no powers are electronic unidirectional
The electromagnet Y2.1 and Y2.2 of valve 2 and 12, the electromagnet m1 of proportional pressure-reducing valve 4, the electromagnet Y3 of the first reversal valve 7 are obstructed
Electricity, the high pressure oil of oil feeding line P is by the oil inlet P 2 of the second reversal valve 8 to the 4th actuator port B2 through check valve 11-1, electronic
Check valve 2 and 12 respectively enters the rod chamber of lift cylinder 1 and 13, the rodless cavity of lift cylinder 1 and 13 by check valve 10 with
The third actuator port A2 of second reversal valve 8 is connected, and the third actuator port A2 of the second reversal valve 8 is through oil return inlet T 2 and oil return
Oil circuit T-phase is connected to, and the rod chamber of lift cylinder 1 and 13 is high pressure oil, and rodless cavity is low pressure oil, and screed is lifted up, wherein
Check valve 10 sets certain back pressure, ensures that screed is steadily lifted up.
When paver screed declines, the electromagnet Y1.2 energizations of the second reversal valve 8, Y1.1 no powers are electronic unidirectional
The electromagnet Y2.1 and Y2.2 of valve 2 and 12 are powered, and the electromagnet Y3 of the electromagnet m1 of proportional pressure-reducing valve 4 and the first reversal valve 7 is equal
The rod chamber of no power, lift cylinder 1 and 13 is connected by electronic check valve 2 and 12 with throttle valve 11-2, throttle valve 11-2
Connected through oil return inlet T 2 and oil return circuit T-phase by the 4th actuator port B2 of the second reversal valve 8, under screed is under Gravitative Loads
Drop, throttle valve 11-2 form certain back pressure, and control screed steadily declines, and the pressure oil of oil feeding line P is through the second reversal valve 8
Oil inlet P 2 arrives third actuator port A2, then the rodless cavity repairing by pressure reducing valve 9 to lift cylinder 1 and 13.
In paver normal operation, screed is in quick condition, and the electromagnet Y1.1 and Y1.2 of the second reversal valve 8 are equal
No power, the electromagnet Y2.1 and Y2.2 of electronic check valve 2 and 12, the electromagnet Y3 of the first reversal valve 7 are powered, ratio decompression
The electromagnet m1 of valve 4 gives corresponding current value according to the pressure requirements monitored by pressure sensor 6, and the first reversal valve 7 will
Lift cylinder 1 is connected with 13 rod chamber with rodless cavity, and is connected to oil return circuit T-phase by throttle grverning unit 3, fuel feeding
The pressure oil of oil circuit P pass through proportional pressure-reducing valve 4 and the first check valve 5, under the action of electronic check valve 2 and 12 respectively with promotion
The rod chamber and rodless cavity of oil cylinder 1 and 13 communicate, and during ironing-board float, proportional pressure-reducing valve 4 can be with certain pressure value
Rod chamber to lift cylinder 1 and 13 and rodless cavity repairing, throttle grverning unit 3 establish certain back pressure, prevent floating in screed
Lift cylinder, which goes out 1 and 13 and emptying phenomenon occurs, during dynamic generates negative pressure, is reduced or eliminated during paver stop-start and carries
Oil-lifting jar 1 and 13 generates displacement and causes impression and the arch camber on road surface.
When paver screed needs to provide hydraulic booster, the electromagnet Y3 of the first reversal valve 7, second reversal valve 8
The equal no powers of electromagnet Y1.1 and Y1.2, the electromagnet Y2.1 and Y2.2 of electronic check valve 2 and 12 are powered, proportional pressure-reducing valve 4
Electromagnet m1 gives corresponding current value, the pressure oil warp of oil feeding line P according to the pressure requirements monitored by pressure sensor 6
Proportional pressure-reducing valve 4 is adjusted after pressure through first check valve 5, electronic check valve 2 and 12 enters lift cylinder 1 and 13 bar
Chamber, the rod chamber of lift cylinder 1 and 13 remain the pressure value being adapted with laminated material, lift cylinder 1 and lift cylinder
13 rodless cavity passes through the second check valve 10, the third actuator port A2 to 2 mouthfuls of oil return inlet T and oil return circuit T of the second reversal valve 8
It is connected, lift cylinder 1 and 13 makes screed by upward power, mitigates screed weight, ensures paving thickness.
When paver screed is latched, electromagnet Y1.1 no powers, the Y1.2 of the second reversal valve 8 are powered, the first commutation
The electromagnet Y3 of valve 7, the electromagnet Y2.1 and Y2.2 of electronic check valve 2 and 12, the electromagnet m1 of proportional pressure-reducing valve 4 are obstructed
Electricity, electronic check valve 2 and 12 lock the fluid of the rod chamber of lift cylinder 1 and 13, prevent screed from declining, oil feeding line P
Pressure oil be connected with the rodless cavity of lift cylinder 1 and 13 after the second reversal valve 8 and pressure reducing valve 9 depressurize, lift cylinder 1 and 13
Rodless cavity keeps certain pressure value, and screed is avoided to be lifted up.
Above in association with embodiment embodiments of the present invention are described in detail, but the present invention is not limited to be retouched
The embodiment stated.Such as electronic check valve 2 and 12 can also be replaced with hydraulic control one-way valve.For those skilled in the art
Speech carries out a variety of variations to these embodiments in the case where not departing from the principle and substance of the present invention spirit, changes, equivalent
It replaces and modification is still fallen within protection scope of the present invention.
Claims (7)
1. a kind of hydraulic control system, the floating for control execution unit and hydraulic booster, which is characterized in that subtract including ratio
Pressure valve (4), throttle grverning unit (3) and the first reversal valve (7), the first actuator port (A1) of first reversal valve (7)
Communicated respectively with two working oil chambers of the execution unit with the second actuator port (B1), first reversal valve (7) into
Hydraulic fluid port (P1) and oil return opening (T1) communicate and, the ratio decompression logical by the throttle grverning unit (3) and oil return circuit T-phase
The oil inlet of valve (4) is connected to pressure oil circuit P, and oil outlet is communicated with the first actuator port (A1) of first reversal valve (7)；
When the execution unit is in quick condition, two working oil chambers of the execution unit pass through first reversal valve
(7) it is connected, two working oil chamber repairings of the pressure oil circuit P by proportional pressure-reducing valve (4) to the execution unit；
When the execution unit needs hydraulic booster, two working oil chambers of the execution unit pass through first reversal valve
(7) it mutually disconnects, the pressure oil circuit P is by the proportional pressure-reducing valve (4) to the work communicated with first actuator port (A1)
Make oil pocket fuel feeding；
The execution unit includes lift cylinder (1,13), described in rod chamber and the rodless cavity conduct of the lift cylinder (1,13)
Two working oil chambers of execution unit are communicated with first actuator port (A1) and second actuator port (B1) respectively；
The hydraulic control system further includes electronic check valve (2,12), the second reversal valve (8), pressure reducing valve (9), one-way throttle valve
(11) the second check valve (10) and with back pressure, the pressure reducing valve (9) and second check valve (10) are arranged in parallel
On the oil circuit being connect with the lift cylinder (1,13) rodless cavity, the oil inlet (P2) of second reversal valve (8) and oil return
Mouth (T2) is logical with the pressure oil circuit P and the oil return circuit T-phase respectively, the third actuator port of second reversal valve (8)
(A2) it is communicated with the oil outlet of the oil inlet of the pressure reducing valve (9) and second check valve (10), the pressure reducing valve (9)
The oil inlet of oil outlet and second check valve (10) is communicated with the rodless cavity of the lift cylinder (1,13), and described second
4th actuator port (B2) of reversal valve (8) is communicated with the first hydraulic fluid port of the one-way throttle valve (11), the one-way throttle valve
(11) the second hydraulic fluid port is communicated with the oil inlet of the electronic check valve (2,12), the oil outlet of the electronic check valve (2,12)
It is communicated 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 passes through second reversal valve (8) and institute
Rod chamber fuel feeding of the one-way throttle valve (11) to the lift cylinder (1,13) is stated, the rodless cavity of the lift cylinder (1,13) is logical
Second check valve (10) and second reversal valve (8) are crossed to the oil return circuit T oil returns；
When the lift cylinder (1,13) is in stretching state, the pressure oil circuit P passes through second reversal valve (8) and institute
Rodless cavity fuel feeding of the pressure reducing valve (9) to the lift cylinder (1,13) is stated, the rod chamber of the lift cylinder (1,13) passes through institute
Electronic check valve (2,12), the one-way throttle valve (11) and second reversal valve (8) is stated to return to the oil return circuit T
Oil；
When the lift cylinder (1,13) is in blocking, the pressure oil circuit P passes through second reversal valve (8) and institute
Rodless cavity fuel feeding of the pressure reducing valve (9) to the lift cylinder (1,13) is stated, the electronic check valve (2,12) is unidirectionally locked described
The rod chamber of lift cylinder (1,13).
2. hydraulic control system according to claim 1, which is characterized in that throttle grverning unit (3) is throttle orifice or tune
Fast valve.
3. hydraulic control system according to claim 1, which is characterized in that further include being connected on the proportional pressure-reducing valve
(4) the first check valve (5) between oil outlet and first actuator port (A1), the oil inlet of first check valve (5)
Mouth is communicated with the oil outlet of the proportional pressure-reducing valve (4), oil outlet and first actuator port of first check valve (5)
(A1) it communicates.
4. hydraulic control system according to claim 3, which is characterized in that further include pressure sensor (6), the pressure
The pressure tap of sensor (6) is arranged between the oil outlet and first actuator port (A1) of first check valve (5)
On oil circuit, the pressure value that the proportional pressure-reducing valve (4) can be detected according to the pressure sensor (6) changes output pressure.
5. hydraulic control system according to claim 1, which is characterized in that second reversal valve (8) is middle position N-type machine
The three-position four-way electromagnetic directional valve or 3-position 4-way hydraulic directional valve of energy.
6. a kind of paver, which is characterized in that have Claims 1 to 5 any one of them hydraulic control system.
7. paver according to claim 6, which is characterized in that the execution unit includes lift cylinder (1,13), institute
State lift cylinder (1,13) rod chamber and rodless cavity as the execution unit two working oil chambers respectively with described first
Actuator port (A1) and second actuator port (B1) communicate, and pave described in the piston rod connection of the lift cylinder (1,13)
The large arm of machine is to promote 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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| CN201510578112.XA CN106523446B (en) | 2015-09-11 | 2015-09-11 | hydraulic control system and paver |
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| CN106523446A CN106523446A (en) | 2017-03-22 |
| CN106523446B true CN106523446B (en) | 2018-08-14 |
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Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102995523A (en) * | 2012-09-07 | 2013-03-27 | 徐州万邦道路工程装备服务股份公司 | Hydraulic control device of ironing plate of paver |
| CN202881828U (en) * | 2012-09-28 | 2013-04-17 | 天津山河装备开发有限公司 | Hydraulic system for controlling movement of ironing plate of road surface paver |
| CN203429541U (en) * | 2013-08-27 | 2014-02-12 | 德州德工机械有限公司 | Rear tail door floating hydraulic system |
| CN104047914B (en) * | 2014-07-03 | 2016-03-09 | 戴纳派克（中国）压实摊铺设备有限公司 | A kind of paver control of floating ironer system and paver |
| CN104805758B (en) * | 2015-03-16 | 2017-04-05 | 徐工集团工程机械股份有限公司道路机械分公司 | A kind of multi-purpose hydraulic system of control paver screed action |
| 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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