CN107630871A - Hydraulic system - Google Patents
Hydraulic system Download PDFInfo
- Publication number
- CN107630871A CN107630871A CN201711112707.1A CN201711112707A CN107630871A CN 107630871 A CN107630871 A CN 107630871A CN 201711112707 A CN201711112707 A CN 201711112707A CN 107630871 A CN107630871 A CN 107630871A
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- Prior art keywords
- valve
- accessory
- control
- proportional pressure
- electric proportional
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- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (AREA)
Abstract
The present invention relates to hydraulic system, to solve the problems, such as that existing load-sensitive hydraulic system working flow in flow unsaturation is unrelated with engine speed.Hydraulic system, including accessory hydraulic actuator, accessory control valve, variable pump, engine, accessory manipulation device, pilot control are provided；Controller, the velocity sensor for detecting engine speed and being connected with the controller that electric proportional pressure-reducing valve, output end are connected with the automatically controlled end of electric proportional pressure-reducing valve；The output end of electric proportional pressure-reducing valve and the control terminal of the load-sensitive valve of plunger pump connect, the input of electric proportional pressure-reducing valve is connected through stop valve with pilot control, and controller makes the pressure signal of electric proportional pressure-reducing valve output corresponding pressure value according to the engine speed that velocity sensor detects according to corresponding preset value output control voltage.The present invention has simple and convenient, person's operation easy to operation, can be according to the characteristics of actual conditions raising operating efficiency.
Description
Technical field
The present invention relates to a kind of hydraulic system, can adjust and flow according to control of engine speed more specifically to one kind
The hydraulic system of amount.
Background technology
Existing load-sensitive hydraulic system excavator is in flow unsaturation, hydraulic work system flow and engine speed
It is unrelated.After element producer is set by the pressure difference of restriction, the working flow of system reaches setting pressure by restriction
Difference, main pump are not further added by discharge capacity then.Now if it is desired to improving the efficiency of excavator single action.Need to reset main pump LS
The pressure difference signal size of mouth (Ioad-sensing control valve element).And after size setting, if it is desired to changing, adjust again again.Not only
Trouble, the non-personnel that are transferred to civilian work are inoperable.
The content of the invention
The technical problem to be solved in the present invention be load-sensitive hydraulic system excavator in flow unsaturation, hydraulic system
Working flow is related to engine speed.Realize as engine speed raises, the increased relation of working flow, to improve operation
The operating efficiency of person.For existing load-sensitive hydraulic system in flow unsaturation, hydraulic work system flow and engine
The unrelated present situation of rotating speed and provide it is a kind of can according to control of engine speed adjust flow hydraulic system
The present invention is such to realize the technical scheme of its purpose：A kind of hydraulic system is provided, including accessory hydraulic pressure is held
Units, the accessory control valve being connected with accessory hydraulic actuator, pumping hole and the change of accessory control valve work oil inlet connection
Measure pump, the engine for driving plunger pump, accessory manipulation device, the pilot control being connected with accessory control valve；The variable
Load-sensitive valve is included in pump；It is characterized in that connect including electric proportional pressure-reducing valve, output end and the automatically controlled end of electric proportional pressure-reducing valve
Controller, the velocity sensor for detecting engine speed and being connected with the controller connect；The electric proportional pressure-reducing valve
Output end and plunger pump load-sensitive valve control terminal connect, the input of electric proportional pressure-reducing valve is through a stop valve and guide
Oil sources connects, and the controller is according to the engine speed that velocity sensor detects according to corresponding preset value output control electricity
Pressure makes the pressure signal of electric proportional pressure-reducing valve output corresponding pressure value.In the present invention, operating personnel are according to required for accessory
Flow and operating mode, control engine speed, and controller corresponds to according to the engine speed detected by velocity sensor, output
Control voltage control electric proportional pressure-reducing valve, pilot control signal enters the input of electric proportional pressure-reducing valve, warp by stop valve
Electric proportional pressure-reducing valve output action in the control terminal of load-sensitive valve, the pressure of electric proportional pressure-reducing valve output, load-sensitive valve from
The pressure collective effect that pressure that pumping hole collects, the spring of load-sensitive valve end, load feedback oil circuit collect is loading
On the valve element of sensitive valve, the discharge capacity of plunger pump is controlled together so that the discharge capacity of plunger pump is adapted with the flow required for accessory.
Engine is in different rotating speeds constantly, and controller exports different electric currents so that the stream required for the discharge capacity and accessory of plunger pump
Amount is adapted.
In above-mentioned hydraulic system, the load feedback oil circuit of the plunger pump and the spring terminal of the load-sensitive valve are (i.e. right
End) connect, the opposite end (i.e. left end) of the output end of the electric proportional pressure-reducing valve and the load-sensitive valve spring terminal of plunger pump is even
Connect.Realize that main pump output flow exports with electric proportional pressure-reducing valve in the case where engine speed is certain, main control valve opening is certain
Pressure increase and reduce.The degree that main pump flow reduces is directly proportional to the pressure that electric proportional pressure-reducing valve exports.The accessory behaviour
Vertical device and pilot valve, the two-way guide output end of the pilot valve is corresponding to be connected with the both ends of accessory control valve, pilot valve
Oil inlet end is connected with pilot control.
In above-mentioned hydraulic system, the stop valve can also be magnetic valve, and the Electromagnetic Control end of magnetic valve can be with control
Device connects, and is controlled by controller, or by accessory manipulation device is linked or be directly connected to realize coordinated signals.Filled when accessory manipulates
It is equipped with when manipulating the action of accessory and occurring, controller output power turns on stop valve, makes the pressure transmission of pilot control to electric
The oil inlet of proportional pressure-reducing valve, when accessory manipulation device is without the action for manipulating accessory, stop valve cut-off.
In the present invention, accessory manipulation device can also be the electronics control of electric control handle etc in addition to being pilot valve
Device processed, correspondingly, accessory control valve are magnetic valve, and the output end of accessory manipulation device is connected to accessory control valve
Electromagnetic Control end, the commutation of accessory control valve is controlled, realize the action control of accessory.
The present invention compared with prior art, has advantages below：
1. operating efficiency can be improved by improving engine speed when excavator hydraulic system is not up to saturation volume；
2. compared with the prior art, the present invention only changes the purpose that engine speed can realizes change working flow；
3. the present invention uses combination of electric and hydraulic, control reliable and stable；
Brief description of the drawings
Fig. 1 is the schematic diagram of hydraulic system in the embodiment of the present invention one.
Parts title and sequence number in figure：
Engine 1, hydraulic oil container 2, pilot valve 3, banked direction control valves 4, variable pump 5, plunger pump 51, load-sensitive valve 53, accessory
Oil cylinder 6, control valve group 7, stop valve 72, electric proportional pressure-reducing valve 71, pioneer pump 8, controller 9.
Embodiment
Illustrate specific embodiment below in conjunction with the accompanying drawings.
Hydraulic system in the present embodiment is as shown in figure 1, it includes accessory hydraulic actuator, control valve group 7, banked direction control valves
4th, variable pump 5, pilot valve 3, pioneer pump 8, controller 9.
Accessory hydraulic actuator can be accessory oil cylinder 6 or hydraulic motor and other use hydraulic energy conduct
The device of drive energy.
There are more linkage control valves, for controlling different hydraulic actuators, wherein just including being used to control in banked direction control valves 4
The hydraulic control accessory control valve of accessory.
Include load-sensitive valve 53 and plunger pump 51 in variable pump 5, the load feedback oil circuit PL interfaces connection of variable pump 5 with
The left end of load-sensitive valve 53, the pumping hole of plunger pump 51 are connected with the oil inlet of banked direction control valves 4, to including accessory control valve
Each control valve fuel feeding.
The two-way guide output end of pilot valve 3 is connected with the hydraulic control end at accessory control valve both ends, control accessory control valve
Commutation, realizes the manipulation of accessory.
Pioneer pump 8 is used as pilot control, is driven together with plunger pump 51 by engine 1, and the liquid draw from hydraulic oil container 2
Force feed, the pumping hole of pioneer pump 8 are connected with guide's oil inlet of pilot valve 3.
Control valve group 7 includes stop valve 82 and electric proportional pressure-reducing valve 81.The output end of electric proportional pressure-reducing valve 81 and variable pump 5
In load-sensitive valve 53 left end connection, the Electromagnetic Control end of electric proportional pressure-reducing valve 81 is connected with controller 9.
Stop valve 82 is 2/2-way magnetic valve, and stop valve 81 is connected to the pumping hole of electric proportional pressure-reducing valve 81 and pioneer pump 8
Between, when stop valve turns on, pilot pressure signal is transferred to the oil inlet of electric proportional pressure-reducing valve by stop valve.
In variable pump 5, the left end of load-sensitive valve 53 has two oil pockets, wherein crossing an oil pocket and load feedback oil circuit
Connection, another oil pocket are connected with the output end of electric proportional pressure-reducing valve 82.The pressure and load feedback of electric ratio output end output
Pressure, the elastic force collective effect of the left end spring of load-sensitive valve 53 load-sensitive valve 53 left end, load-sensitive valve 53
The pumping hole of right-hand member and plunger pump connects, and load-sensitive valve both ends are finally reached balance, are achieved in the discharge capacity of plunger pump.
The velocity sensor being connected with controller is used for the rotating speed for detecting engine, and controller is defeated according to the rotating speed of engine
Go out corresponding voltage to be used to control electric proportional pressure-reducing valve, electric proportional pressure-reducing valve exports corresponding hydraulic pressure.
Hydraulic system in the present embodiment, available for excavator, on board a dredger, the rotating speed of engine by shift control,
Operator is by rotating the rotating speed of corresponding shift control engine.
In the present embodiment, the accessory and operating mode that operator connects according to machine, select appropriate engine to work and keep off
Position, and make stop valve in the conduction state, the voltage signal of the respective sensor of controller 9 output simultaneously exports corresponding voltage signal
The electromagnetism end of electric proportional pressure-reducing valve 81 is delivered to, proportional pressure-reducing valve 81 will export the hydraulic oil of corresponding pressure, and the pressure oil will be made
Used in the left end of the load-sensitive valve 53 of plunger pump 5 so that the valve element of load-sensitive valve 53 moves to right, so as to realize according to engine
Control of 1 rotating speed to the discharge capacity of plunger pump 51.
When not needing accessory work, that is, when not needing flow control, close stop valve and keep it turned off, at this moment complete machine will not
The rotating speed according to engine 1 controls the discharge capacity of plunger pump 51 again, and machine system will be changed into load sensitive system.
In the present embodiment, stop valve can be magnetic valve, and magnetic valve links with pilot valve, can also be and connects with controller
Connect, directly controlled by controller.
In the present embodiment, accessory control valve is the pilot operated valve device controlled by pilot valve, in the specific implementation, accessory control valve
Can also be solenoid directional control valve, accessory manipulation device is accordingly changed into the electric control handle of electric handle etc, electric control handle and category
Has the Electromagnetic Control end connection at control valve both ends.
Claims (4)
1. a kind of hydraulic system, including accessory hydraulic actuator, the accessory control valve being connected with accessory hydraulic actuator, pump
Mouthful with accessory control valve work variable pump that oil inlet is connected, the engine for driving plunger pump, be connected with accessory control valve
Accessory manipulation device, pilot control；Load-sensitive valve is included in the variable pump；It is characterized in that depressurized including electric ratio
Controller that valve, output end are connected with the automatically controlled end of electric proportional pressure-reducing valve, for detect engine speed and with the controller
The velocity sensor of connection；The output end of the electric proportional pressure-reducing valve and the control terminal of the load-sensitive valve of plunger pump connect, electricity
The input of proportional pressure-reducing valve is connected through stop valve with pilot control, and the controller starts according to what velocity sensor detected
Machine rotating speed makes the pressure signal of electric proportional pressure-reducing valve output corresponding pressure value according to corresponding preset value output control voltage.
2. hydraulic system according to claim 1, it is characterised in that the load feedback oil circuit of the plunger pump is born with described
Carry the opposition of the spring terminal connection of sensitive valve, the output end of the electric proportional pressure-reducing valve and the load-sensitive valve spring terminal of plunger pump
End connection.
3. hydraulic system according to claim 1 or 2, it is characterised in that the accessory manipulation device is pilot valve, described
The two-way guide output end of pilot valve is corresponding to be connected with the both ends of accessory control valve, and oil inlet end and the pilot control of pilot valve connect
Connect.
4. hydraulic system according to claim 3, it is characterised in that the stop valve is 2/2-way magnetic valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711112707.1A CN107630871A (en) | 2017-11-13 | 2017-11-13 | Hydraulic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711112707.1A CN107630871A (en) | 2017-11-13 | 2017-11-13 | Hydraulic system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107630871A true CN107630871A (en) | 2018-01-26 |
Family
ID=61107725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711112707.1A Pending CN107630871A (en) | 2017-11-13 | 2017-11-13 | Hydraulic system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107630871A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109695599A (en) * | 2019-01-31 | 2019-04-30 | 广西柳工机械股份有限公司 | Variable delivery hydraulic system, pump output flow control method, engineering machinery |
| WO2023123782A1 (en) * | 2021-12-29 | 2023-07-06 | 湖南三一中型起重机械有限公司 | Electro-hydraulic combined control system, method, and operation machine |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01267326A (en) * | 1988-04-18 | 1989-10-25 | Hitachi Constr Mach Co Ltd | Engine controller for civil engineering and construction machinery |
| JPH04362286A (en) * | 1991-06-07 | 1992-12-15 | Shin Caterpillar Mitsubishi Ltd | Controller for variable capacity pump |
| CN1353794A (en) * | 2000-03-31 | 2002-06-12 | 新履带牵引车三菱有限公司 | Pump control method and pump control device |
| CN102139830A (en) * | 2011-01-27 | 2011-08-03 | 天津山河装备开发有限公司 | Load-sensitive double-power control device suitable for crawler crane |
| CN201971557U (en) * | 2011-01-27 | 2011-09-14 | 天津山河装备开发有限公司 | Crawler type crane load sensing double power controlling device |
| CN203427615U (en) * | 2013-07-22 | 2014-02-12 | 四川泛水基电液机械有限责任公司 | Open type walking system |
| CN103727082A (en) * | 2013-12-27 | 2014-04-16 | 三一汽车起重机械有限公司 | Hydraulic system and engineering machine |
| CN105525905A (en) * | 2014-09-28 | 2016-04-27 | 徐工集团工程机械股份有限公司 | Power self-adaptive control system of rotary drilling rig and power self-adaptive control method of rotary drilling rig |
-
2017
- 2017-11-13 CN CN201711112707.1A patent/CN107630871A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01267326A (en) * | 1988-04-18 | 1989-10-25 | Hitachi Constr Mach Co Ltd | Engine controller for civil engineering and construction machinery |
| JPH04362286A (en) * | 1991-06-07 | 1992-12-15 | Shin Caterpillar Mitsubishi Ltd | Controller for variable capacity pump |
| CN1353794A (en) * | 2000-03-31 | 2002-06-12 | 新履带牵引车三菱有限公司 | Pump control method and pump control device |
| CN102139830A (en) * | 2011-01-27 | 2011-08-03 | 天津山河装备开发有限公司 | Load-sensitive double-power control device suitable for crawler crane |
| CN201971557U (en) * | 2011-01-27 | 2011-09-14 | 天津山河装备开发有限公司 | Crawler type crane load sensing double power controlling device |
| CN203427615U (en) * | 2013-07-22 | 2014-02-12 | 四川泛水基电液机械有限责任公司 | Open type walking system |
| CN103727082A (en) * | 2013-12-27 | 2014-04-16 | 三一汽车起重机械有限公司 | Hydraulic system and engineering machine |
| CN105525905A (en) * | 2014-09-28 | 2016-04-27 | 徐工集团工程机械股份有限公司 | Power self-adaptive control system of rotary drilling rig and power self-adaptive control method of rotary drilling rig |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109695599A (en) * | 2019-01-31 | 2019-04-30 | 广西柳工机械股份有限公司 | Variable delivery hydraulic system, pump output flow control method, engineering machinery |
| WO2023123782A1 (en) * | 2021-12-29 | 2023-07-06 | 湖南三一中型起重机械有限公司 | Electro-hydraulic combined control system, method, and operation machine |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180126 |
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| WD01 | Invention patent application deemed withdrawn after publication |