CN103541398A - Hydraulic hybrid power system of excavator - Google Patents
Hydraulic hybrid power system of excavator Download PDFInfo
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- CN103541398A CN103541398A CN201210247183.8A CN201210247183A CN103541398A CN 103541398 A CN103541398 A CN 103541398A CN 201210247183 A CN201210247183 A CN 201210247183A CN 103541398 A CN103541398 A CN 103541398A
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Abstract
The invention discloses a hydraulic hybrid power system of an excavator. The hydraulic hybrid power system of the excavator is connected with a hydraulic rotary motor of the excavator and comprises a variable pump I, a variable pump II, a one-way valve, reversing valves, an energy accumulator and shuttle valves, wherein the variable pump I and the variable pump II are connected back to back, the two ends of each shuttle valve are connected with an oil inlet and an oil outlet of the rotary motor, the variable pump I and the variable pump II are connected with the two shuttle valves respectively through the reversing valves, the energy accumulator is connected with one reversing valve, and the variable pump II is connected with the energy accumulator through the one-way valve. The hydraulic hybrid power system of the excavator can effectively absorb the energy generated in the rotary braking process of the excavator, and release the energy in the reverse rotation process of the excavator, thereby achieving recovery of energy. Meanwhile, the hydraulic hybrid power system of the excavator protects a hydraulic system and elements, avoids hydraulic impact and overflowing heat radiation, and prolongs the service life of hydraulic elements and mechanical parts.
Description
Technical field
The invention belongs to the hybrid power system of engineering machinery vehicle, be specifically related to a kind of hydraulic hybrid power system of excavator.
Background technology
The rotating energy consumption of single bucket hydraulic excavator slew gear accounts for 25%～40%, and the calorific value of revolution hydraulic circuit accounts for 30%～40% of hydraulic system gross calorific power.During rotary braking, certainly lead to hydraulic shock and overflow heating; bring adverse effect to the application life of Hydraulic Elements and the heat balance of hydraulic system; as this part energy is recycled; system and element have been protected; saved again energy, so everybody more and more pays close attention to the recycling of this part energy.
In the actual job of excavator, revolution is that work cycle must be used, and excavates, fills after bucket, carries swing arm and turns round simultaneously, is turned back to before unloading position, starts braking, the discharging of exhibition bucket.Then reversed turning, the arm that falls, get back to initialization state, then enter next operation cycle.When rotary braking, first must operate revolution pilot valve and get back to meta, the oil circuit of turnover rotary motor A, B mouth is cut off, yet now due to the inertia of top rotating part, motor still continues rotation, suppose to be previously the oil-feed of A mouth, cause B mouth pressure sharply to raise, cause hydraulic shock, when hydraulic pressure is elevated to the setting pressure of overload valve, open overload valve, overflow back hydraulic oil container, thereby cause spill losses.
Current medium-and-large-sized excavator power control system is all devoted to the Study on energy saving of hybrid power, on some medium-sized excavator, just actively apply electric mixed dynamic system, with energy conservation effectively, but electric hybrid system must be used the components and parts such as generator motor, current transformer, capacitor, converter, electric rotating machine, could be effectively mechanical energy during by revolution be converted to electric energy and be stored up, by discharging and recharging of capacitor, drive motor drives rotary reducer motion, the recycling of energy when realizing rotary braking.Prior art field, adopts the electricity mixed power of this basic principle more.Its defect is: use the multiple electric elements such as capacitor, narrow space above revolving platform of excavator, give to install and use and cause many difficulties, after breaking down, keep in repair also inconvenience, and electric elements connect complexity, volume is large, expensive and the life-span is short.
Summary of the invention
The above-mentioned defect existing in order to overcome prior art field, the object of the invention is to, and a kind of hydraulic hybrid power system of excavator is provided, avoided hydraulic shock and overflow heating, and has improved the application life of Hydraulic Elements, machine components.
Hydraulic hybrid power system of excavator provided by the invention, be connected with the hydraulic rotary motor of excavator, it comprises variable pump I, the variable pump II of opposing connection, and one way valve, reversal valve, accumulator, shuttle valve, shuttle valve two ends connect the oil inlet and outlet of rotary motor, variable pump I, variable pump II are connected with two shuttle valves by reversal valve respectively, and accumulator is connected with a reversal valve, and variable pump II is connected with accumulator by one way valve.
Hydraulic hybrid power system of excavator provided by the invention, hydraulic circuit is connected with rotary motor oil circuit, during forward braking, the energy producing due to inertia during by braking is finally converted to hydraulic energy and is stored up, and then when reverse rotation, again hydraulic energy is discharged into by loop in the oil circuit of rotary motor, drives motor reverse rotation.Realize the recycling of energy.When forward turns round, the hydraulic oil producing during rotary braking is through shuttle valve and hydraulic control one-way valve entering variable pump I, and now variable pump I is used as hydraulic motor, drives variable pump II rotation, to accumulator pressurizing, completes Plenum Process.When reverse rotation variations per hour pump, II is used as hydraulic motor, drive variable pump I, pressure oil in accumulator enters the oil-in of hydraulic motor through variable pump I, hydraulic control one-way valve and shuttle valve, mechanical energy when rotary fluid motor is braked is like this converted into hydraulic energy, pressurising and release by accumulator, be constantly recycled.
Hydraulic hybrid power system of excavator provided by the invention; its beneficial effect is; energy in the time of can effectively absorbing digger revolving braking; and discharge when excavator reversed turning; thereby realize the recycling of energy; protected hydraulic system and element simultaneously, avoided hydraulic shock and overflow heating, and improved the application life of Hydraulic Elements, machine components.This apparatus structure is succinct, control is simple, and use, operation, installation, maintenance are conveniently.
The present invention compares with existing electricity mixed power, and advantage of the present invention is:
1. control principle simple possible of the present invention, components and parts used are few, install simple, stringing wiring is convenient, cost is low, and be easy to realize, only from the oil inlet and outlet of rotary motor, draw pressure oil to hydraulic accumulator, can effectively realize the recovery of energy and use, and installation site concentrates on rotary motor one side;
2. the mechanical energy that the inertia while turning round due to excavator top during by braking produces is converted to hydraulic energy, recycles; Only adopt Hydraulic Elements, do not need electric elements, compare with electricity mixed power, the weight of unit power is little, and volume is little, takes up room little, installs with maintenance very convenient;
3. handle and control conveniently, adopt hydraulic valve and two-way variable displacement pump change pressure, flow and the flow direction of liquid stream and realize stepless speed regulation.Job security is easy to realize well overload protection;
4. compare with electricity mixed power, response is fast, and dynamic characteristic is good;
5. compare with electricity mixed power, hydraulic hybrid is all realized by hydraulic system and Hydraulic Elements, without electrical parts that difficulty is manufactured, price is high such as high-voltage capacitance, generator motors, and safety, green, environmental protection.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of one embodiment of the invention;
In figure, mark:
1. variable pump I; 2. variable pump II; 3. one way valve; 4. reversal valve I; 5. accumulator; 6. shuttle valve I, 7. reversal valve II; 8. shuttle valve II
The specific embodiment, with reference to the accompanying drawings, in conjunction with an embodiment, is described in detail hydraulic hybrid power system of excavator provided by the invention.
Embodiment, with reference to Fig. 1, the hydraulic hybrid power system of excavator of the present embodiment, be connected with the hydraulic rotary motor of excavator, it comprises variable pump I 1, the variable pump II2 of opposing connection, and one way valve 3, reversal valve I 4, reversal valve II 7, accumulator 5, shuttle valve I 6, shuttle valve II8, shuttle valve two ends connect the oil inlet and outlet of rotary motor, variable pump I, variable pump II are connected with two shuttle valves by reversal valve respectively, accumulator 5 is connected with reversal valve I 4, and variable pump II2 is connected with accumulator 5 by one way valve 3.
The hydraulic hybrid power system of excavator of the present embodiment, when starting forward revolution, rotary motor supposes the oil-feed of A mouth, B mouth is fuel-displaced, the hydraulic oil that rotary motor hydraulic system produces is ended to reversal valve II after shuttle valve II by A mouth, now the pressure oil before hydraulic braking time-delay valve is 0, can not open reversal valve II.Although the pilot pressure of revolution guide operating valve is also transported to reversal valve I simultaneously, open reversal valve I, the hydraulic energy of not yet storing hydraulic energy or storage in accumulator 5 discharged.Variable pump II stops, and can not drive variable pump I rotation.
When forward has turned round, during rotary braking, pressure oil before hydraulic braking time-delay valve is directed to reversal valve II, opens reversal valve II, the hydraulic oil that rotary motor hydraulic system produces by B mouth through shuttle valve I and reversal valve II entering variable pump I, now variable pump I is used as hydraulic motor, drive variable pump II rotation, open one way valve 3, now reversal valve I cut-off, to accumulator 5 pressurisings, complete Plenum Process.Mechanical energy when rotary motor is braked is like this converted into hydraulic energy, and hydraulic energy is converted into mechanical energy by variable pump I.Mechanical energy is converted into again hydraulic energy by variable pump II, at accumulator, stores.
When reverse rotation, the pilot pressure of revolution guide operating valve is also transported to reversal valve I, reversal valve II simultaneously, open reversal valve I, reversal valve II,, the pressure oil in accumulator is through reversal valve I entering variable pump II, and variable pump II is used as hydraulic motor, drive variable pump I, the pressure oil that variable pump I produces enters the oil-in of motor through reversal valve II and shuttle valve I, accumulator hydraulic energy like this, and by variable pump, II is converted into mechanical energy.Mechanical energy is converted into again hydraulic energy by variable pump I, to rotary motor fuel feeding.Pressurising and release by accumulator, be constantly recycled.
Claims (1)
1. a hydraulic hybrid power system of excavator, be connected with the hydraulic rotary motor of excavator, it is characterized in that: it comprises variable pump I, the variable pump II of opposing connection, and one way valve, reversal valve, accumulator, shuttle valve, shuttle valve two ends connect the oil inlet and outlet of rotary motor, variable pump I, variable pump II are connected with two shuttle valves by reversal valve respectively, and accumulator is connected with a reversal valve, and variable pump II is connected with accumulator by one way valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210247183.8A CN103541398A (en) | 2012-07-17 | 2012-07-17 | Hydraulic hybrid power system of excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210247183.8A CN103541398A (en) | 2012-07-17 | 2012-07-17 | Hydraulic hybrid power system of excavator |
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| CN103541398A true CN103541398A (en) | 2014-01-29 |
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| CN201210247183.8A Pending CN103541398A (en) | 2012-07-17 | 2012-07-17 | Hydraulic hybrid power system of excavator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105297818A (en) * | 2014-06-10 | 2016-02-03 | 日立建机株式会社 | Hybrid construction machine |
| CN108894274A (en) * | 2018-07-27 | 2018-11-27 | 徐州工业职业技术学院 | A kind of excavator rotation energy recycling and reuse system |
-
2012
- 2012-07-17 CN CN201210247183.8A patent/CN103541398A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105297818A (en) * | 2014-06-10 | 2016-02-03 | 日立建机株式会社 | Hybrid construction machine |
| CN105297818B (en) * | 2014-06-10 | 2019-11-26 | 日立建机株式会社 | Hybrid power engineering machinery |
| CN108894274A (en) * | 2018-07-27 | 2018-11-27 | 徐州工业职业技术学院 | A kind of excavator rotation energy recycling and reuse system |
| CN108894274B (en) * | 2018-07-27 | 2020-10-16 | 徐州工业职业技术学院 | Excavator gyration energy recuperation and system of recycling |
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Application publication date: 20140129 |