CN105862962B - Reduce the hydraulic circuit of return oil pressure - Google Patents
Reduce the hydraulic circuit of return oil pressure Download PDFInfo
- Publication number
- CN105862962B CN105862962B CN201610374368.3A CN201610374368A CN105862962B CN 105862962 B CN105862962 B CN 105862962B CN 201610374368 A CN201610374368 A CN 201610374368A CN 105862962 B CN105862962 B CN 105862962B
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- Prior art keywords
- valve
- oil
- operated directional
- pilot operated
- directional control
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- 239000002828 fuel tank Substances 0.000 claims abstract description 14
- 239000003921 oil Substances 0.000 abstract description 64
- 239000010729 system oil Substances 0.000 abstract description 11
- 239000010705 motor oil Substances 0.000 abstract description 7
- 239000002699 waste material Substances 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000007599 discharging Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2289—Closed circuit
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The present invention proposes a kind of hydraulic circuit for reducing return oil pressure, including the first counterbalance valve, fuel tank and pilot operated directional control valve, oil return line is sequentially connected the first counterbalance valve and fuel tank, the first interface of pilot operated directional control valve connects the oil inlet side of the first counterbalance valve by the road, the second interface of pilot operated directional control valve connects the fuel-displaced side of the first counterbalance valve by the road, and pilot control connects the control mouth of pilot operated directional control valve to control the switch of pilot operated directional control valve by the road.Beneficial effects of the present invention are：The oil compensation pressure of rotary motor oil inlet can be met, rotary motor oil inlet is avoided to generate negative pressure, cause to be emptied；Oil compensation pressure can be controlled, when the flow of system oil return is very big, return pressure is controlled, reduces the waste of return pressure to reduce power consumption.
Description
Technical field
The present invention relates to hydraulic circuit technical field, more particularly to a kind of hydraulic circuit for reducing return oil pressure.
Background technology
Under most of operating mode, excavator needs to carry out revolution action, and the revolution action of excavator is revolved by rotary motor
Turn what is realized.When excavator turns round stopping, rotary motor import moment closes, but because the inertia of excavator, can drive
Rotary motor continues to rotate, and rotary motor enters " pump condition ".The oil inlet of rotary motor has been switched off at this time, so without liquid
Pressure oil is supplemented, and the pressure of oil inlet can drastically decline, and is generated negative pressure, is caused to be emptied.Such case can generate noise, gas
Erosion, influences the normal use of excavator and the service life of rotary motor.In order to avoid being emptied for rotary motor, setting is generally required
Feed circuit, rotary motor oil inlet and outlet pressure be less than certain value when, system oil return through oil return line be its repairing, repairing
Pressure requirements are in 0.34MPa between 1MPa.In order to meet the needs of oil compensation pressure, can generally be set in the oil return line of excavator
Counterbalance valve is put, system oil return is dissipated by counterbalance valve and oil returns to fuel tank, due to the limitation of counterbalance valve and the scattered through-current capacity of oil, in system
When the flow of oil return is very big, return pressure can be raised rapidly, and far more than oil compensation pressure, which results in the wastes of return pressure.
Since excavator partial act has interflow function (double pump fuel feeding), by taking 30T type dipper dischargings as an example, the small chamber of bucket arm cylinder into
Oil, oil inlet flow are about double pump flow summation (600L/min), due to 2 times that the big cavity area of bucket arm cylinder is small cavity area, institute
Using big chamber return flow as 1200L/min, return oil pressure is up to 0.8MPa.But according to the requirement of rotary motor, oil compensation pressure
More than 0.34MPa.That is, the pressure for having 0.46MPa is wasted, flow at this time is 1200L/min, is converted into
Power is exactly 9.2Kw.This Partial Power adds oil consumption, and the power lost becomes heat, adds cooling system
Burden.
The content of the invention
It is an object of the invention to provide a kind of hydraulic circuits for reducing return oil pressure, can meet rotary motor oil inlet
Oil compensation pressure, and controllable oil compensation pressure is to reduce power consumption.
The present invention provides a kind of hydraulic circuit for reducing return oil pressure, including the first counterbalance valve, fuel tank and pilot operated directional control valve,
Oil return line is sequentially connected the first counterbalance valve and fuel tank, the first interface of pilot operated directional control valve connect by the road the first counterbalance valve into
Oily side, the second interface of pilot operated directional control valve connect the fuel-displaced side of the first counterbalance valve by the road, and pilot control connects hydraulic control by the road
The control mouth of reversal valve is to control the switch of pilot operated directional control valve.
Further, pilot control connects the control mouth of pilot operated directional control valve through two position three-way valve by the road, turns round guide oil
Signal connects the control mouth of two position three-way valve by the road.
Further, control mouth of the guide oil signal through one-way throttle valve pipeline connection two position three-way valve is turned round.
Further, control mouth of the pilot control through shuttle valve pipeline connection pilot operated directional control valve.
Further, two oil inlets of two-way pilot control difference pipeline connection shuttle valve.
Further, the second counterbalance valve is further included, the second counterbalance valve is connected in parallel with the first counterbalance valve.
Further, connected on the oil return line between the fuel-displaced side of the first counterbalance valve and the fuel-displaced side of the second counterbalance valve
There is oil to dissipate.
Further, it is connected with return filter on the oil return line between the fuel-displaced side of the second counterbalance valve and fuel tank.
Compared with prior art, the hydraulic circuit of reduction return oil pressure of the invention has the characteristics that and advantage：
1st, the hydraulic circuit of reduction return oil pressure of the invention, can meet the oil compensation pressure of rotary motor oil inlet, keep away
Exempt from rotary motor oil inlet to generate negative pressure, cause to be emptied；
2nd, the hydraulic circuit of reduction return oil pressure of the invention, can control oil compensation pressure, system oil return flow very
When big, return pressure is controlled, reduces the waste of return pressure to reduce power consumption.
After the specific embodiment of the present invention is read in conjunction with the figure, the features and advantages of the invention will become clearer.
Description of the drawings
It in order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is the present invention
Some embodiments, for those of ordinary skill in the art, without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is the structure chart for the hydraulic circuit that return oil pressure is reduced in the embodiment of the present invention 1；
Fig. 2 is the structure chart for the hydraulic circuit that return oil pressure is reduced in the embodiment of the present invention 2；
Wherein,
11st, the first counterbalance valve, the 12, second counterbalance valve, 2, pilot operated directional control valve, 3, oil dissipate, 4, return filter, 5, fuel tank,
6th, two position three-way valve, 7, one-way throttle valve, 8, shuttle valve.
Specific embodiment
Embodiment 1
As shown in Figure 1, the present embodiment provides a kind of hydraulic circuit for reducing return oil pressure, oil return line is sequentially connected first
Counterbalance valve 11, return filter 4 and fuel tank 5, the second counterbalance valve 12 are connected in parallel with the first counterbalance valve 11, in the first counterbalance valve 11
Fuel-displaced side and the second counterbalance valve 12 fuel-displaced side between oil return line on be connected with oil dissipate 3, the first of pilot operated directional control valve 2 connects
Mouth connects the oil inlet side of the first counterbalance valve 11 by the road, and the second interface of pilot operated directional control valve 2 connects the first counterbalance valve 11 by the road
Fuel-displaced side, pilot control connects the control mouth X of pilot operated directional control valve 2 through two position three-way valve 6 by the road, revolution guide oil signal warp
7 pipeline of one-way throttle valve connects the control mouth of two position three-way valve 6.When excavator does the action in addition to revolution, pilot control
The control mouth X of pilot operated directional control valve 2 is applied to by two position three-way valve 6 so that the system oil return of excavator is without the first back pressure
11 and second counterbalance valve 12 of valve, and directly connect oil and dissipate 3, the back pressure of system oil return is very low at this time, and power loss is small.Work as excavator
When carrying out revolution action, revolution guide oil signal is applied to two position three-way valve 6 by one-way throttle valve 7 so that two position three-way valve 6
Commutation so that the control mouth X of pilot operated directional control valve 2 connects fuel tank, makes pilot operated directional control valve 2 in the closed position, then system
Oil return has to pass through the first counterbalance valve 11, the 12 ability oil return of the second counterbalance valve, and horse is turned round to meet so as to improve return oil pressure
Up to the needs of oil compensation pressure.When rotary motor rotary braking, the control mouth of two position three-way valve 6 must pass through one-way throttle valve 7
Restriction oil return, the oil return time can adjust by changing the orifice dimensions of throttle valve 7, to meet rotary motor braking
The repairing of process needs.
Embodiment 2
As shown in Fig. 2, the present embodiment, with being in place of the difference of embodiment 1, pilot control connects hydraulic control through 8 pipeline of shuttle valve
The control mouth X of reversal valve 2.Can all the way large-flow-rate pilot oil sources pipeline connection shuttle valve 8 an oil inlet, can also two-way it is big
Flow pilot control difference pipeline connects two oil inlets of shuttle valve 8, is two-way large-flow-rate pilot oil sources in the present embodiment, is respectively
Dipper discharging pilot control and swing arm decline pilot control.Excavator carries out dipper discharging and swing arm step-down operation, shuttle valve 8 detect
The signal for the pilot control that dipper discharging pilot control and swing arm decline, when detecting one of signal, guide oil meeting
The control mouth X of pilot operated directional control valve 2 is entered by shuttle valve 8, pilot operated directional control valve 2 is made to commutate, so as to which system oil return directly be connected
Dissipate 3 to oil, at this time system oil return some be not required to using the first counterbalance valve 11 and directly reach oil and dissipate 3, reduce by
The flow of first counterbalance valve 11 and the second counterbalance valve 12, so as to reduce the back pressure of system oil return, power loss is small.Excavator into
The discharging of row dipper and swing arm decline etc. trigger the operation outside big flow oil return, and shuttle valve 8 will not trigger the control of pilot operated directional control valve 2
Mouth X, makes pilot operated directional control valve 2 in the closed position, then system oil return has to pass through the first counterbalance valve 11, the second counterbalance valve 12
Can oil return, meet the needs of rotary motor oil compensation pressure so as to improve return oil pressure.
Certainly, above description is not limitation of the present invention, and the present invention is also not limited to the example above, this technology neck
The variations, modifications, additions or substitutions that the technical staff in domain is made in the essential scope of the present invention should also belong to the present invention's
Protection domain.
Claims (5)
1. a kind of hydraulic circuit for reducing return oil pressure, it is characterised in that：Including the first counterbalance valve, fuel tank and pilot operated directional control valve,
Oil return line is sequentially connected the first counterbalance valve and fuel tank, the first interface of pilot operated directional control valve connect by the road the first counterbalance valve into
Oily side, the second interface of pilot operated directional control valve connect the fuel-displaced side of the first counterbalance valve by the road, and pilot control is passed through through two position three-way valve
Pipeline connects the control mouth of pilot operated directional control valve, and revolution guide oil signal connects the control mouth of two position three-way valve by the road, and revolution is first
Control mouth of the Oil Guide signal through one-way throttle valve pipeline connection two position three-way valve.
2. a kind of hydraulic circuit for reducing return oil pressure, it is characterised in that：Including the first counterbalance valve, fuel tank and pilot operated directional control valve,
Oil return line is sequentially connected the first counterbalance valve and fuel tank, the first interface of pilot operated directional control valve connect by the road the first counterbalance valve into
Oily side, the second interface of pilot operated directional control valve connect the fuel-displaced side of the first counterbalance valve by the road, and pilot control is connected through shuttle valve pipeline
The control mouth of pilot operated directional control valve, two oil inlets of two-way pilot control difference pipeline connection shuttle valve.
3. a kind of hydraulic circuit for reducing return oil pressure according to claim 1 or 2, it is characterised in that：Further include second
Counterbalance valve, the second counterbalance valve are connected in parallel with the first counterbalance valve.
4. a kind of hydraulic circuit for reducing return oil pressure according to claim 3, it is characterised in that：In the first counterbalance valve
Oil is connected on oil return line between fuel-displaced side and the fuel-displaced side of the second counterbalance valve to dissipate.
5. a kind of hydraulic circuit for reducing return oil pressure according to claim 4, it is characterised in that：In the second counterbalance valve
Return filter is connected on oil return line between fuel-displaced side and fuel tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610374368.3A CN105862962B (en) | 2016-05-31 | 2016-05-31 | Reduce the hydraulic circuit of return oil pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610374368.3A CN105862962B (en) | 2016-05-31 | 2016-05-31 | Reduce the hydraulic circuit of return oil pressure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105862962A CN105862962A (en) | 2016-08-17 |
| CN105862962B true CN105862962B (en) | 2018-05-18 |
Family
ID=56641984
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610374368.3A Active CN105862962B (en) | 2016-05-31 | 2016-05-31 | Reduce the hydraulic circuit of return oil pressure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105862962B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109268331A (en) * | 2018-11-09 | 2019-01-25 | 中国船舶重工集团公司第七〇九研究所 | A kind of combination counterbalance valve and back pressure apparatus |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5571226A (en) * | 1993-09-07 | 1996-11-05 | Kabushiki Kaisha Kobe Seiko Sho | Hydraulic device for construction machinery |
| CN102797274A (en) * | 2012-08-28 | 2012-11-28 | 北京南车时代机车车辆机械有限公司 | Hydraulic system for rubber hose reel and continuous wall grab bucket with hydraulic system |
| CN103195124A (en) * | 2013-04-03 | 2013-07-10 | 徐州徐工挖掘机械有限公司 | Excavator return oil pressure control loop |
| CN203429680U (en) * | 2013-07-24 | 2014-02-12 | 徐州重型机械有限公司 | Road-block removing vehicle and hydraulic system thereof for controlling lifting and falling of load |
| CN204572611U (en) * | 2015-04-16 | 2015-08-19 | 郑州宇通重工有限公司 | A kind of novel swing arm unloading valve |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9503854D0 (en) * | 1995-02-25 | 1995-04-19 | Ultra Hydraulics Ltd | Electrohydraulic proportional control valve assemblies |
-
2016
- 2016-05-31 CN CN201610374368.3A patent/CN105862962B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5571226A (en) * | 1993-09-07 | 1996-11-05 | Kabushiki Kaisha Kobe Seiko Sho | Hydraulic device for construction machinery |
| CN102797274A (en) * | 2012-08-28 | 2012-11-28 | 北京南车时代机车车辆机械有限公司 | Hydraulic system for rubber hose reel and continuous wall grab bucket with hydraulic system |
| CN103195124A (en) * | 2013-04-03 | 2013-07-10 | 徐州徐工挖掘机械有限公司 | Excavator return oil pressure control loop |
| CN203429680U (en) * | 2013-07-24 | 2014-02-12 | 徐州重型机械有限公司 | Road-block removing vehicle and hydraulic system thereof for controlling lifting and falling of load |
| CN204572611U (en) * | 2015-04-16 | 2015-08-19 | 郑州宇通重工有限公司 | A kind of novel swing arm unloading valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105862962A (en) | 2016-08-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 266500 No. 75 east the Yellow River Road, Qingdao economic and Technological Development Zone, Shandong Applicant after: QINGDAO LOVOL ENGINEERING MACHINERY Co.,Ltd. Address before: 266500 No. 75 east the Yellow River Road, Qingdao economic and Technological Development Zone, Shandong Applicant before: QINGDAO LOVOL EXCAVATOR Co.,Ltd. |
|
| CB02 | Change of applicant information | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Li Bing Inventor after: Wang Bin Inventor after: Chen Weixiong Inventor after: Wang Guimin Inventor after: Meng Xiaoxing Inventor after: Zhang Wei Inventor after: Xia Jinling Inventor after: Wang Rong Inventor after: Wang Kaixuan Inventor before: Li Bing Inventor before: Wang Bin Inventor before: Chen Weixiong Inventor before: Wang Guimin Inventor before: Meng Xiaoxing Inventor before: Zhang Wei Inventor before: Xia Jinling Inventor before: Wang Rong |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 266500 No. 75 East Huanghe Road, Huangdao District, Qingdao City, Shandong Province Patentee after: LOVOL Engineering Machinery Group Co.,Ltd. Address before: 266500 No. 75 east the Yellow River Road, Qingdao economic and Technological Development Zone, Shandong Patentee before: QINGDAO LOVOL ENGINEERING MACHINERY Co.,Ltd. |
|
| CP03 | Change of name, title or address | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 266500 No. 75 East Huanghe Road, Huangdao District, Qingdao City, Shandong Province Patentee after: Lovol Heavy Industry Group Co.,Ltd. Address before: 266500 No. 75 East Huanghe Road, Huangdao District, Qingdao City, Shandong Province Patentee before: LOVOL Engineering Machinery Group Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder |