CN105298958B - Loader working hydraulic system capable of recycling overflow energy - Google Patents
Loader working hydraulic system capable of recycling overflow energy Download PDFInfo
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- CN105298958B CN105298958B CN201510858712.1A CN201510858712A CN105298958B CN 105298958 B CN105298958 B CN 105298958B CN 201510858712 A CN201510858712 A CN 201510858712A CN 105298958 B CN105298958 B CN 105298958B
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Abstract
The invention discloses a loader working hydraulic system capable of recycling overflow energy. Compared with a current hydraulic system, the loader working hydraulic system mainly has an energy accumulator and an overflow energy recycling valve additionallyarranged , wherein the overflow energy recycling valve consists of a load pressure acquiring valve, a switch valve, a two-position four-way valve, an overflow valve, a two-position three-way reversing valve, a one-way valve and a hydraulic-control one-way valve. The overflow energy recycling valve comprises a plurality of judging conditions, by which the hydraulic system disclosed by the invention can be guaranteed to safely recycle and reutilize overflow energy. The loader working hydraulic system has the beneficial effects of safely recycling the overflow energy of the working hydraulic system; and the whole system is hydraulically controlled, and no electrical control unit is introduced.
Description
Technical field
Patent of the present invention belongs to technical field of engineering machinery, specifically, more particularly to a kind of loading machine working hydraulic pressure system
System.
Background technology
The key operation mode of loading machine is spading operation and loading operation, in order to complete this two classes operation, it is necessary to by work
Make hydraulic system driving hydraulic cylinder to complete lifting, decline, receive the action such as bucket, discharging.
Fig. 1 is that constant displacement pump general at present drives loading machine hydraulic system of working, and its energy loss is mainly damaged including overflow
Lose, restriction loss and middle position off-load are lost.When loading machine carries out heavily loaded operation, spill losses is the main energy consumption of hydraulic system of working
Source.Reducing the main method of spill losses at present includes using variable pump drive hydraulic system principle or uses Dual-pump flow-converging hydraulic pressure
System, but above-mentioned two classes system can only reduce spill losses, can not recycle overflow energy, and variable system cost
Far above quantitative system.
In order to reduce the spill losses that constant displacement pump drives loading machine hydraulic system of working, the present invention proposes a kind of new returning
Receive and utilize the Novel work hydraulic system of spill losses.
The content of the invention
Technical scheme as shown in Fig. 2 including：Fuel tank（1）, oil filter（2）, constant displacement pump（3）, multiple directional control valve
（4）, lifting hydraulic cylinder（5）, tipping bucket hydraulic cylinder（6）, accumulator（7）With overflow energy recovery valve（8）；Wherein overflow energy recovery valve
（8）Valve is gathered comprising load pressure（8-1）, switch valve（8-2）, two-position four-way valve（8-3）, overflow valve（8-4）, two-position three way changes
To valve（8-5）, check valve（8-6）And hydraulic control one-way valve（8-7）.
Connected mode is as shown in Figure 2：Fuel tank（1）Outlet is through oil filter（2）With constant displacement pump（3）Entrance is connected, constant displacement pump（3）
Outlet is through overflow energy recovery valve（8）With multiple directional control valve（4）Entrance is connected, multiple directional control valve（4）Outlet respectively with lifting hydraulic pressure
Cylinder（5）, tipping bucket hydraulic cylinder（6）, fuel tank（1）Connection, overflow energy recovery valve（8）Respectively with accumulator（7）, fuel tank（1）Connection.Its
Middle overflow energy recovery valve（8）Internal main connected mode is：Load pressure gathers valve（8-1）Input port is respectively lifting hydraulic pressure
Cylinder（5）Big chamber and tipping bucket hydraulic cylinder（6）The connection of small chamber, delivery outlet and hydraulic control one-way valve（8-7）Control port connection；Liquid
Control check valve（8-7）Respectively with accumulator（7）And two-position four-way valve（8-3）The next control port connection；Two-position three way commutates
Valve（8-5）Entrance and overflow valve（8-4）Outlet connection, outlet respectively with accumulator（7）And fuel tank（1）Connection；Two three
Logical reversal valve（8-5）Control port and accumulator（7）Connection；Two-position four-way valve（8-3）Four hydraulic fluid ports respectively with constant displacement pump
（3）Outlet, multiple directional control valve（4）Import, fuel tank（1）And accumulator（7）Connection.
Operation principle of the invention is：For the existing loading machine hydraulic system of working shown in Fig. 1, when work pump discharge pressure
When power is more than the Opening pressure of overflow valve, the high-voltage oil liquid of constant displacement pump output can flow back to fuel tank through overflow valve, and this is spill losses
Producing reason.For the proposed by the present invention new hydraulic system of working shown in Fig. 2, work as working barrel（3）Outlet pressure is more than excessive
Stream valve（8-4）Opening pressure when, constant displacement pump output high-voltage oil liquid can be by two position three way directional control valve（8-5）Flow into accumulator
（7）, to accumulator（7）Carry out filling energy, make accumulator（7）Interior pressure rises；Work as accumulator（7）Pressure reach highest work
During pressure, then two position three way directional control valve can be made by Stress control oil circuit（8-5）It is operated in the high-voltage oil liquid warp of bottom, i.e. overflow
Two position three way directional control valve（8-5）Flow back to fuel tank（1）, which ensures that the security of hydraulic system；Load pressure gathers valve（8-1）
Lifting hydraulic cylinder can always be gathered（5）Big chamber and tipping bucket hydraulic cylinder（6）The load pressure in small chamber, when load pressure is more than hydraulic control list
To valve（8-7）During Opening pressure, hydraulic control one-way valve（8-7）Open, accumulator（7）Pressure can and load pressure be compared,
If accumulator（7）Pressure and two-position four-way valve（8-3）Lower end spring pressure sum is not less than load pressure and two-position four-way valve
（8-3）Upper end spring pressure sum, can make two-position four-way valve by Stress control oil circuit（8-3）Bottom is operated in, if now storing
Can device（7）Pressure be not less than switch valve（8-2）Transposition pressure (switch valve（8-2）Transposition pressure be equal to accumulator most
Low operating pressure), then accumulator（7）Interior high-voltage oil liquid is through two-position four-way valve（8-3）Individually to hydraulic system fuel feeding, constant displacement pump
（3）The fluid of output is then all through two-position four-way valve（8-3）Low-pressure load discharge, flows back to fuel tank（1）.If accumulator（7）Pressure
With two-position four-way valve（8-3）Lower end spring pressure sum is less than load pressure and two-position four-way valve（8-3）Upper end spring pressure it
With then two-position four-way valve（8-3）Be operated in it is upper, i.e., by constant displacement pump（3）Individually to hydraulic system fuel feeding, if same accumulator
（7）Pressure be less than switch valve（8-2）Transposition pressure, also by constant displacement pump（3）Individually to hydraulic system fuel feeding.Manage for convenience
The whole process of above-mentioned recycling overflow energy is solved, the operation principle flow chart of Fig. 3 is may refer to.
It should be noted that in order that hydraulic system proposed by the present invention safely and effectively reclaims overflow energy, there is following 5
Constraints must be satisfied for.
1. switch valve（8-2）Transposition pressure be accumulator（7）Minimum operating pressure, the condition ensure accumulator（7）
Inside store enough high-voltage oil liquids.
2. two-position four-way valve（8-3）Upper end spring pressure have to be larger than lower end spring pressure, and the condition ensures there was only accumulation of energy
Device（7）When pressure is higher than load pressure, just can be by accumulator（7）Individually to hydraulic system fuel feeding.
3. overflow valve（8-4）And its and fuel tank（1）Between connected pipes minimum effectively flow area must be fulfilled for it is following
The constraint of experience aperture flow formula：Q≦CA(2Δp/ρ)0.5, Q represents overflow valve in formula（8-4）Specified excess flow, C tables
Show orifice-metering coefficient, A represents minimum effectively flow area, and Δ p represents overflow valve（8-4）Opening pressure and accumulator（7）
Maximum working pressure difference, the difference is necessary on the occasion of ρ represents the density of hydraulic oil；The condition belongs to safe working conditions, must
Must be satisfied, it ensure that the high-voltage oil liquid of overflow can safely flow to accumulator.The physical significance of the condition is overflow valve（8-
4）And its and fuel tank（1）Between connected pipes minimum effectively flow area it is bigger, the overflow safety of hydraulic system is higher.
4. hydraulic control one-way valve（8-7）Opening pressure have to be larger than 4Mp, the condition ensure that accumulator（7）Will not be in dress
To hydraulic system fuel feeding during carrier aircraft zero load.
5. switch valve（8-2）Transposition pressure be accumulator（7）Minimum operating pressure, two position three way directional control valve（8-5）
Transposition pressure be accumulator（7）Maximum working pressure.
The beneficial effects of the invention are as follows：1. can reclaim and using the overflow energy of loading machine hydraulic system of working；2.
Whole recovery and recycling overflow energy process are full automatic, it is not necessary to the intervention of driver, will not change the operation of driver
Custom；3. compared with existing hydraulic system of working, the hydraulic system only needs to add accumulator（7）With overflow energy recovery valve
（8）, and whole new system is all hydraulic control, without introducing ECU, it is ensured that easily reequip and low cost.
Brief description of the drawings
Fig. 1 is that constant displacement pump general at present drives loading machine hydraulic system of working figure.
Fig. 2 is hydraulic schematic diagram of the invention.
Fig. 3 is operation principle flow chart of the invention.
In Fig. 1：1. fuel tank, 2. oil filter, 3. constant displacement pump, 4. multiple directional control valve, 5. lifting hydraulic cylinder, 6. tipping bucket hydraulic pressure
Cylinder, 7. overflow valve.
In Fig. 2：1. fuel tank, 2. oil filter, 3. constant displacement pump, 4. multiple directional control valve, 5. lifting hydraulic cylinder, 6. tipping bucket hydraulic pressure
Cylinder, 7. accumulator, 8. overflow energy recovery valve；8-1. load pressures gather valve, 8-2. switch valves, 8-3. two-position four-way valves, 8-4.
Overflow valve, 8-5. two position three way directional control valves, 8-6. check valves, 8-7. hydraulic control one-way valves.
Specific embodiment
Specific embodiment of the invention is as shown in Figures 2 and 3：By overflow valve（8-4）Judge constant displacement pump（3）Outlet pressure
Whether power is not less than overflow valve（8-4）Opening pressure, if it is not, then by two position three way directional control valve（8-5）Judge accumulation of energy
Device（7）Whether maximum working pressure (MWP) is reached, overflow fluid is through two position three way directional control valve if reaching（8-5）Fuel tank is flowed back in bottom
（1）, overflow fluid is through two position three way directional control valve if not up to（8-5）Upper inflow accumulator（7）；On the other hand, if
Constant displacement pump（3）Outlet pressure is less than overflow valve（8-4）Opening pressure, then by two-position four-way valve（8-3）Judge accumulator（7）'s
Pressure and two-position four-way valve（8-3）Whether lower end spring pressure sum is not less than load pressure and two-position four-way valve（8-3）Upper end
Spring pressure sum, if less than then two-position four-way valve（8-3）Be operated in it is upper, by constant displacement pump（3）Individually supplied to hydraulic system
Oil；If be not less than and through switch valve（8-2）Judge accumulator（7）Pressure be not less than its minimum operating pressure, then switch
Valve（8-2）And two-position four-way valve（8-3）All it is operated in bottom, accumulator（7）Interior high-voltage oil liquid is independent to hydraulic system fuel feeding,
Constant displacement pump（3）The fluid of output then Low-pressure load discharge, flows back to fuel tank（1）If be not less than and through switch valve（8-2）Judge accumulation of energy
Device（7）Pressure be less than its minimum operating pressure, then switch valve（8-2）It is operated in upper, then still by constant displacement pump（3）Individually to
Hydraulic system fuel feeding.
The constraints that hydraulic system proposed by the present invention must is fulfilled for is illustrated in the latter half of the content of the invention
It is clear.
Claims (3)
1. a kind of recyclable overflow can loading machine hydraulic system of working, it is including fuel tank (1), oil filter (2), constant displacement pump (3), many
Way reversing valve (4), lifting hydraulic cylinder (5), tipping bucket hydraulic cylinder (6), accumulator (7) and overflow energy recovery valve (8), wherein overflow energy
Recovery valve (8) gathers valve (8-1), switch valve (8-2), two-position four-way valve (8-3), overflow valve including load pressure（8-4）, two
Three-way diverter valve（8-5）, check valve (8-6) and hydraulic control one-way valve (8-7)；Load pressure collection valve (8-1) input respectively with
The small chamber connection in the big chamber and tipping bucket hydraulic cylinder (6) of lifting hydraulic cylinder (5), output end is oily with the control of hydraulic control one-way valve (8-7)
Mouth connection；The control port at two-position four-way valve (8-3) upper place is connected with the output end of load pressure collection valve (8-1), one
Control port at four-way valve (8-3) bottom is connected through hydraulic control one-way valve (8-7) with accumulator (7) outlet；Under switch valve (8-2)
The control port at control port and two position three way directional control valve (8-5) bottom at position is all connected with accumulator (7) outlet;It is described
A kind of recyclable overflow can loading machine hydraulic system of working, it is characterised in that：When constant displacement pump (3) outlet pressure is not less than excessive
During the Opening pressure of stream valve (8-4), if accumulator (7) reaches maximum working pressure (MWP), overflow fluid commutates through two-position three way
Fuel tank (1) is flowed back in valve (8-5) bottom, if accumulator (7) is not up to maximum working pressure (MWP), overflow fluid is changed through two-position three way
To the upper inflow accumulator (7) of valve (8-5)；When Opening pressure of constant displacement pump (3) outlet pressure less than overflow valve (8-4), such as
The pressure of fruit accumulator (7) is with two-position four-way valve (8-3) lower end spring pressure sum less than load pressure and two-position four-way valve (8-
3) upper end spring pressure sum, then constant displacement pump (3) is independent to hydraulic system fuel feeding, if the pressure of accumulator (7) and two four
Port valve (8-3) lower end spring pressure sum not less than load pressure and two-position four-way valve (8-3) upper end spring pressure sum and
The pressure of accumulator (7) is not less than its minimum operating pressure, then accumulator (7) is independent to hydraulic system fuel feeding, if accumulator
(7) pressure is with two-position four-way valve (8-3) lower end spring pressure sum not less than load pressure and two-position four-way valve (8-3) upper end
But the pressure of spring pressure sum accumulator (7) is less than its minimum operating pressure, then constant displacement pump (3) is individually supplied to hydraulic system
Oil.
2. a kind of recyclable overflow according to claim 1 can loading machine hydraulic system of working, it is characterised in that:By two
Position three-way diverter valve (8-5) judges whether accumulator (7) reaches maximum working pressure (MWP), if reached, two position three way directional control valve
(8-5) is operated in bottom;If not up to, two position three way directional control valve (8-5) is operated in upper.
3. a kind of recyclable overflow according to claim 1 can loading machine hydraulic system of working, it is characterised in that:By two
It is negative that position four-way valve (8-3) judges whether the pressure of accumulator (7) and two-position four-way valve (8-3) lower end spring pressure sum are not less than
Pressure and two-position four-way valve (8-3) upper end spring pressure sum are carried, if being not less than and judging accumulator through switch valve (8-2)
(7) pressure is not less than its minimum operating pressure, then switch valve (8-2) and two-position four-way valve (8-3) are all being operated in bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510858712.1A CN105298958B (en) | 2015-12-01 | 2015-12-01 | Loader working hydraulic system capable of recycling overflow energy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510858712.1A CN105298958B (en) | 2015-12-01 | 2015-12-01 | Loader working hydraulic system capable of recycling overflow energy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105298958A CN105298958A (en) | 2016-02-03 |
| CN105298958B true CN105298958B (en) | 2017-05-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510858712.1A Expired - Fee Related CN105298958B (en) | 2015-12-01 | 2015-12-01 | Loader working hydraulic system capable of recycling overflow energy |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102016117206A1 (en) * | 2016-09-13 | 2018-03-15 | Linde Hydraulics Gmbh & Co. Kg | Load-sensing drive system |
| DE102016117208A1 (en) * | 2016-09-13 | 2018-03-15 | Linde Hydraulics Gmbh & Co. Kg | Load-sensing drive system |
| CN107327432B (en) * | 2017-08-25 | 2019-03-29 | 太原科技大学 | A kind of pump control cylinder hydraulic circuit and its control method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102518170A (en) * | 2011-12-27 | 2012-06-27 | 四川大学 | Hydraulic system of loading machine working device |
| CN104405004A (en) * | 2014-11-07 | 2015-03-11 | 徐州徐工挖掘机械有限公司 | Rotating overflow energy recycling system of hydraulic excavator |
| CN104948541A (en) * | 2015-06-04 | 2015-09-30 | 宿州同创机械设备有限公司 | Hydraulic overflow energy recycling system |
| CN204703220U (en) * | 2015-06-12 | 2015-10-14 | 圣邦集团有限公司 | Loading machine quantitative pump and variable pump multiplex control system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011133072A1 (en) * | 2010-04-19 | 2011-10-27 | Parker Hannifin Ab | Arrangement for operating a hydraulic device |
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2015
- 2015-12-01 CN CN201510858712.1A patent/CN105298958B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102518170A (en) * | 2011-12-27 | 2012-06-27 | 四川大学 | Hydraulic system of loading machine working device |
| CN104405004A (en) * | 2014-11-07 | 2015-03-11 | 徐州徐工挖掘机械有限公司 | Rotating overflow energy recycling system of hydraulic excavator |
| CN104948541A (en) * | 2015-06-04 | 2015-09-30 | 宿州同创机械设备有限公司 | Hydraulic overflow energy recycling system |
| CN204703220U (en) * | 2015-06-12 | 2015-10-14 | 圣邦集团有限公司 | Loading machine quantitative pump and variable pump multiplex control system |
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| CN105298958A (en) | 2016-02-03 |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Tan Zhaojun Inventor after: Yan Zhenwei Inventor after: Yuan Xianjie Inventor before: Tan Zhaojun Inventor before: Yan Zhenwei Inventor before: Yuan Xianjie |
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| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170524 Termination date: 20181201 |