CN105298958A - 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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- CN105298958A CN105298958A CN201510858712.1A CN201510858712A CN105298958A CN 105298958 A CN105298958 A CN 105298958A CN 201510858712 A CN201510858712 A CN 201510858712A CN 105298958 A CN105298958 A CN 105298958A
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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, particularly relates to a kind of loader hydraulic system of working.
Background technique
The key operation mode of loader is spading operation and loading operation, in order to complete this two classes operation, needs to drive oil hydraulic cylinder to complete the actions such as lifting, decline, receipts bucket, discharging by hydraulic system of working.
Fig. 1 is that metering pump general at present drives loader hydraulic system of working, and its energy loss mainly comprises spill losses, restriction loss and meta off-load loss.When loader carries out heavily loaded operation, spill losses is the main energy consumption source of hydraulic system of working.The main method of current reduction spill losses comprises employing variable displacement pump drive hydraulic system principle or adopts dual-pump combining hydraulic system, but above-mentioned two type systematics can only reduce spill losses, overflow energy can not be recycled, and the cost of variable system is far above quantitative system.
Drive the spill losses of loader hydraulic system of working to reduce metering pump, the present invention proposes a kind of newly recyclable and utilizes the Novel work hydraulic system of spill losses.
Summary of the invention
Technological scheme of the present invention as shown in Figure 2, comprising: fuel tank (1), oil purifier (2), metering pump (3), multiple directional control valve (4), lifting hydraulic cylinder (5), tipping bucket oil hydraulic cylinder (6), accumulator (7) and overflow energy recovery valve (8); Wherein overflow energy recovery valve (8) comprises induced pressure collection valve (8-1), switch valve (8-2), two-position four-way valve (8-3), relief valve (8-4), two position three way directional control valve (8-5), one-way valve (8-6) and Pilot operated check valve (8-7).
Placement is as shown in Figure 2: fuel tank (1) outlet is connected with metering pump (3) entrance through oil purifier (2), metering pump (3) outlet is connected with multiple directional control valve (4) entrance through overflow energy recovery valve (8), multiple directional control valve (4) outlet is connected with lifting hydraulic cylinder (5), tipping bucket oil hydraulic cylinder (6), fuel tank (1) respectively, and overflow energy recovery valve (8) is connected with accumulator (7), fuel tank (1) respectively.The main Placement that wherein overflow energy recovery valve (8) is inner is: the large chamber that induced pressure collection valve (8-1) inlet opening is respectively lifting hydraulic cylinder (5) is connected with the loculus of tipping bucket oil hydraulic cylinder (6), and delivery outlet is connected with the control port of Pilot operated check valve (8-7); Pilot operated check valve (8-7) is connected with the next control port of accumulator (7) and two-position four-way valve (8-3) respectively; The entrance of two position three way directional control valve (8-5) is connected with the outlet of relief valve (8-4), and outlet is connected with accumulator (7) and fuel tank (1) respectively; The control port of two position three way directional control valve (8-5) is connected with accumulator (7); Four hydraulic fluid ports of two-position four-way valve (8-3) are connected with the import of the outlet of metering pump (3), multiple directional control valve (4), fuel tank (1) and accumulator (7) respectively.
Working principle of the present invention for: for the existing loader hydraulic system of working shown in Fig. 1, when working pump outlet pressure is greater than the cracking pressure of relief valve, metering pump export high-voltage oil liquid can flow back to fuel tank through relief valve, this is spill losses Producing reason.For the new hydraulic system of working that the present invention shown in Fig. 2 proposes, when working pump (3) outlet pressure is greater than the cracking pressure of relief valve (8-4), the high-voltage oil liquid that metering pump exports can flow into accumulator (7) through two position three way directional control valve (8-5), energy is filled to accumulator (7), makes the pressure increase in accumulator (7), when the pressure of accumulator (7) reaches Maximum operating pressure, then two position three way directional control valve (8-5) can be made to be operated in bottom by Stress control oil circuit, namely the high-voltage oil liquid of overflow flows back to fuel tank (1) through two position three way directional control valve (8-5), which ensure that the Security of hydraulic system, induced pressure gathers the induced pressure that valve (8-1) can gather the large chamber of lifting hydraulic cylinder (5) and tipping bucket oil hydraulic cylinder (6) loculus always, when induced pressure is greater than Pilot operated check valve (8-7) cracking pressure, Pilot operated check valve (8-7) is opened, the pressure meeting of accumulator (7) and induced pressure compare, if the pressure of accumulator (7) and two-position four-way valve (8-3) lower end spring pressure sum are not less than induced pressure and two-position four-way valve (8-3) upper end spring pressure sum, two-position four-way valve (8-3) can be made to be operated in bottom by Stress control oil circuit, if now the pressure of accumulator (7) is not less than the transposition pressure (the transposition pressure of switch valve (8-2) equals the Minimum operating pressure of accumulator) of switch valve (8-2), high-voltage oil liquid then in accumulator (7) is independent to hydraulic system fuel feeding through two-position four-way valve (8-3), the fluid that metering pump (3) exports is then all through two-position four-way valve (8-3) Low-pressure load discharge, flow back to fuel tank (1).If the pressure of accumulator (7) and two-position four-way valve (8-3) lower end spring pressure sum are less than induced pressure and two-position four-way valve (8-3) upper end spring pressure sum, then two-position four-way valve (8-3) is operated in upper, namely independent to hydraulic system fuel feeding by metering pump (3), if the pressure of same accumulator (7) is less than the transposition pressure of switch valve (8-2), also independent to hydraulic system fuel feeding by metering pump (3).Conveniently understand the whole process of above-mentioned recycling overflow energy, can referring to the working principle flow chart of Fig. 3.
It should be noted that the hydraulic system in order to make the present invention propose reclaims overflow energy safely and effectively, having following 5 constraint conditios to be met.
1. the transposition pressure of switch valve (8-2) is the Minimum operating pressure of accumulator (7), and this condition ensures to store abundant high-voltage oil liquid in accumulator (7).
2. two-position four-way valve (8-3) upper end spring pressure must be greater than lower end spring pressure, when this condition ensures to only have accumulator (7) pressure higher than induced pressure, and just can by accumulator (7) separately to hydraulic system fuel feeding.
3. relief valve (8-4) and and fuel tank (1) between minimum effective flow area of connected pipes must meet the constraint of following experience aperture flow formula: Q≤CA (2 Δ p/ ρ)
0.5, in formula, Q represents the specified excess flow of relief valve (8-4), and C represents orifice-metering coefficient, A represents minimum effective flow area, Δ p represents the difference of the cracking pressure of relief valve (8-4) and the Maximum operating pressure of accumulator (7), this difference be necessary on the occasion of, ρ represents the density of hydraulic oil; This condition belongs to safe working conditions, must be satisfied, and the high-voltage oil liquid which ensuring overflow can flow to accumulator safely.The physical significance of this condition be relief valve (8-4) and and fuel tank (1) between minimum effective flow area of connected pipes larger, the overflow safety of hydraulic system is higher.
4. the cracking pressure of Pilot operated check valve (8-7) must be greater than 4Mp, and this condition ensure that accumulator (7) can not when loader is unloaded to hydraulic system fuel feeding.
5. the transposition pressure of switch valve (8-2) is the Minimum operating pressure of accumulator (7), and the transposition pressure of two position three way directional control valve (8-5) is the Maximum operating pressure of accumulator (7).
The invention has the beneficial effects as follows: 1. can reclaim and utilize the overflow energy of loader hydraulic system of working; 2. whole recovery and recycling overflow energy process are full automatic, do not need the intervention of driver, can not change the operating habit of driver; 3. compared with existing hydraulic system of working, this hydraulic system only needs to add accumulator (7) and overflow energy recovery valve (8), and whole new system is all hydraulic control, does not introduce ECU (Electrical Control Unit), ensure that easily repacking and low cost.
Accompanying drawing explanation
Fig. 1 is that metering pump general at present drives loader hydraulic system of working figure.
Fig. 2 is hydraulic schematic diagram of the present invention.
Fig. 3 is working principle flow chart of the present invention.
In Fig. 1: 1. fuel tank, 2. oil purifier, 3. metering pump, 4. multiple directional control valve, 5. lifting hydraulic cylinder, 6. tipping bucket oil hydraulic cylinder, 7. relief valve.
In Fig. 2: 1. fuel tank, 2. oil purifier, 3. metering pump, 4. multiple directional control valve, 5. lifting hydraulic cylinder, 6. tipping bucket oil hydraulic cylinder, 7. accumulator, 8. overflow energy recovery valve; 8-1. induced pressure gathers valve, 8-2. switch valve, 8-3. two-position four-way valve, 8-4. relief valve, 8-5. two position three way directional control valve, 8-6. one-way valve, 8-7. Pilot operated check valve.
Embodiment
The specific embodiment of the present invention is as shown in Figures 2 and 3: judge whether metering pump (3) outlet pressure is not less than the cracking pressure of relief valve (8-4) by relief valve (8-4), if be not less than, then judge whether accumulator (7) reaches maximum service pressure by two position three way directional control valve (8-5), if reached, overflow fluid flows back to fuel tank (1) through two position three way directional control valve (8-5) bottom, if do not reached, overflow fluid is through the upper inflow accumulator (7) of two position three way directional control valve (8-5); On the other hand, if metering pump (3) outlet pressure is less than the cracking pressure of relief valve (8-4), then judge whether the pressure of accumulator (7) and two-position four-way valve (8-3) lower end spring pressure sum are not less than induced pressure and two-position four-way valve (8-3) upper end spring pressure sum by two-position four-way valve (8-3), if be less than, two-position four-way valve (8-3) is operated in upper, by metering pump (3) separately to hydraulic system fuel feeding; If be not less than and judge that the pressure of accumulator (7) is not less than its Minimum operating pressure through switch valve (8-2), then switch valve (8-2) and two-position four-way valve (8-3) are all operated in bottom, high-voltage oil liquid in accumulator (7) is separately to hydraulic system fuel feeding, the fluid then Low-pressure load discharge that metering pump (3) exports, flow back to fuel tank (1), if be not less than and judge that the pressure of accumulator (7) is less than its Minimum operating pressure through switch valve (8-2), then switch valve (8-2) is operated in upper, so still independent to hydraulic system fuel feeding by metering pump (3).
The constraint conditio that the hydraulic system that the present invention proposes must meet is set forth clear at the latter half part of summary of the invention.
Claims (3)
1. the loader hydraulic system of working of a recyclable overflow energy, comprise fuel tank (1), oil purifier (2), metering pump (3), multiple directional control valve (4), lifting hydraulic cylinder (5), tipping bucket oil hydraulic cylinder (6), accumulator (7) and overflow energy recovery valve (8), wherein overflow energy recovery valve (8) comprises induced pressure collection valve (8-1), switch valve (8-2), two-position four-way valve (8-3), relief valve (8-4), two position three way directional control valve (8-5), one-way valve (8-6) and Pilot operated check valve (8-7), induced pressure gathers valve (8-1) input end and is connected with the large chamber of lifting hydraulic cylinder (5) and the loculus of tipping bucket oil hydraulic cylinder (6) respectively, and output terminal is connected with the control port of Pilot operated check valve (8-7), the output terminal that control port and the induced pressure at two-position four-way valve (8-3) upper place gather valve (8-1) is connected, and the control port at two-position four-way valve (8-3) bottom place to export with accumulator (7) through Pilot operated check valve (8-7) and is connected, the control port at switch valve (8-2) bottom place all exports with accumulator (7) with the control port at two position three way directional control valve (8-5) bottom place and is connected, the loader hydraulic system of working of described a kind of recyclable overflow energy, it is characterized in that: when metering pump (3) outlet pressure is not less than the cracking pressure of relief valve (8-4), if accumulator (7) reaches maximum service pressure, then overflow fluid flows back to fuel tank (1) through two position three way directional control valve (8-5) bottom, if accumulator (7) does not reach maximum service pressure, then overflow fluid is through the upper inflow accumulator (7) of two position three way directional control valve (8-5), when metering pump (3) outlet pressure is less than the cracking pressure of relief valve (8-4), if the pressure of accumulator (7) and two-position four-way valve (8-3) lower end spring pressure sum are less than induced pressure and two-position four-way valve (8-3) upper end spring pressure sum, then metering pump (3) is separately to hydraulic system fuel feeding, if the pressure of accumulator (7) and two-position four-way valve (8-3) lower end spring pressure sum are not less than induced 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 separately to hydraulic system fuel feeding, if the pressure of accumulator (7) and two-position four-way valve (8-3) lower end spring pressure sum are not less than induced pressure and two-position four-way valve (8-3) but the pressure of upper end spring pressure sum accumulator (7) is less than its Minimum operating pressure, then metering pump (3) is separately to hydraulic system fuel feeding.
2. the loader hydraulic system of working of a kind of recyclable overflow energy according to claim 1, it is characterized in that: judge whether accumulator (7) reaches maximum service pressure by two position three way directional control valve (8-5), if reached, then two position three way directional control valve (8-5) is operated in bottom; If do not reached, then two position three way directional control valve (8-5) is operated in upper.
3. the loader hydraulic system of working of a kind of recyclable overflow energy according to claim 1, it is characterized in that: judge whether the pressure of accumulator (7) and two-position four-way valve (8-3) lower end spring pressure sum are not less than induced pressure and two-position four-way valve (8-3) upper end spring pressure sum by two-position four-way valve (8-3), if be not less than, then two-position four-way valve (8-3) is operated in bottom; If be less than, then two-position four-way valve (8-3) is operated in upper.
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 |
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| Publication Number | Publication Date |
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| CN105298958A true CN105298958A (en) | 2016-02-03 |
| CN105298958B CN105298958B (en) | 2017-05-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| 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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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107327432A (en) * | 2017-08-25 | 2017-11-07 | 太原科技大学 | A kind of pump control cylinder hydraulic circuit and its control method |
| CN107816468A (en) * | 2016-09-13 | 2018-03-20 | 林德液压两合公司 | Load-transducing formula drive system |
| CN107816460A (en) * | 2016-09-13 | 2018-03-20 | 林德液压两合公司 | Load-transducing formula drive system |
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| CN102518170A (en) * | 2011-12-27 | 2012-06-27 | 四川大学 | Hydraulic system of loading machine working device |
| US20130111890A1 (en) * | 2010-04-19 | 2013-05-09 | Parker Hannifin Ab | Hydraulic start/stop system |
| 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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2015
- 2015-12-01 CN CN201510858712.1A patent/CN105298958B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20130111890A1 (en) * | 2010-04-19 | 2013-05-09 | Parker Hannifin Ab | Hydraulic start/stop system |
| 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 |
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| 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 |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107816468A (en) * | 2016-09-13 | 2018-03-20 | 林德液压两合公司 | Load-transducing formula drive system |
| CN107816460A (en) * | 2016-09-13 | 2018-03-20 | 林德液压两合公司 | Load-transducing formula drive system |
| CN107816460B (en) * | 2016-09-13 | 2020-08-07 | 林德液压两合公司 | Load sensing drive system |
| CN107327432A (en) * | 2017-08-25 | 2017-11-07 | 太原科技大学 | A kind of pump control cylinder hydraulic circuit and its control method |
| 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 |
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| CN105298958B (en) | 2017-05-24 |
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| 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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Granted publication date: 20170524 Termination date: 20181201 |