CN102943499A - Energy-saving method for load sensitivity system of small and medium-sized excavator - Google Patents
Energy-saving method for load sensitivity system of small and medium-sized excavator Download PDFInfo
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- CN102943499A CN102943499A CN2012104629687A CN201210462968A CN102943499A CN 102943499 A CN102943499 A CN 102943499A CN 2012104629687 A CN2012104629687 A CN 2012104629687A CN 201210462968 A CN201210462968 A CN 201210462968A CN 102943499 A CN102943499 A CN 102943499A
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Abstract
The invention discloses an energy-saving method for a load sensitivity system of a small and medium-sized excavator. The method comprises the following steps of: arranging a load sensitivity oil way at periphery of a variable pump, wherein the load sensitivity oil way is connected with the variable pump through a pressure compensation valve, and an orifice is formed on the oil way between the variable pump and the load sensitivity oil way; arranging a load sensing control valve which is matched with a load sensing control variable hydraulic pump in the system, comparing the load pressure with the outlet pressure of a hydraulic pump, and driving a variable displacement mechanism of the hydraulic pump; and when a plurality of executing components exist, comparing the maximum load pressure with the outlet pressure of the hydraulic pump through shuttle valves, driving the variable displacement mechanism of a pump to operate and changing the output volume of the hydraulic pump. The system has the advantages that the oil supply shortage phenomenon generated when the plurality of executing components simultaneously work, and the needed flow is more than the flow of the hydraulic pump in a common system is solved; the operation controllability is improved; and the energy-saving effect is improved.
Description
Technical field
The present invention relates to the hydraulic technique field, relate in particular to a kind of middle-size and small-size excavator load sensitive system power-economizing method.
Background technology
Hydraulic system has that power is large, operating pressure and the flow adjustability is good, heat can be brought back the advantages such as fuel tank.But there is the multiple energy conversion in hydraulic drive, and hydraulic oil container causes latency environment to pollute and the loss of oil, therefore, and the essential performance that improves hydraulic drive and control of hydraulic technique, could adapt to sustainable development and energy-conservation needs, ability raising and Electrified Transmission, machine driving competitiveness.The current main-stream excavator still adopts banked direction control valves as main control valve, the main power loss of this type systematic comprise that restriction loss, slew gear start and braking procedure in spill losses, the losses of potential energy in the swing arm decline process and restriction loss and the bad and loss that causes of motor and hydraulic system power coupling.Development along with Energy Saving Technology by Hydraulic Pressure, the hydraulic system of excavator develops into the multiple control modes such as minus flow control, positive flow control and load-sensitive control, obviously exist a lot of defectives, be widely used on the middle-size and small-size excavator, when each executing agency works simultaneously, it is reasonable not that flow is supplied with distribution, and the operation controllability is relatively poor.
Summary of the invention
The purpose of this invention is to provide a kind of make dynamical system and load power demand coupling better, be conducive to improve the operation controllability, be conducive to improve the middle-size and small-size excavator load sensitive system power-economizing method of energy-saving effect, to solve many deficiencies of prior art.
Purpose of the present invention is come specific implementation by the following technical programs:
A kind of middle-size and small-size excavator load sensitive system power-economizing method mainly is comprised of following steps:
At first, at variable pump peripheral disposition load-sensitive oil circuit, this load-sensitive oil circuit is through a pressure compensation valve link variable pump, the oil circuit between variable pump and load-sensitive oil circuit is provided with throttle orifice;
⑵ adjusting joint discharge orifice make its flow relevant with aperture area, make the flow that enters executive component be proportional to throttle hole area, unnecessary flow directly returns fuel tank by pressure-compensated valve;
⑶ arrange a load sensing controlled valve and be complementary with the load sensing controlled volume adjustable hydraulic pump in internal system, and load pressure is compared with the hydraulic pump outlet pressure, drives the stroking mechanism of hydraulic pump;
⑷ utilize set shuttle valve that maximum load pressure is compared with the hydraulic pump outlet pressure when a plurality of executive component is arranged, and drives the stroking mechanism action of pump, changes the hydraulic pressure pump delivery.
The beneficial effect of middle-size and small-size excavator load sensitive system power-economizing method of the present invention is: this system has solved in the conventional system, when a plurality of executive components are worked simultaneously, required flow is during greater than the flow of hydraulic pump, with the phenomenon that produces for shortage of oil, simultaneously, be conducive to improve operation controllability, raising energy-saving effect.
The specific embodiment
The described middle-size and small-size excavator load sensitive system power-economizing method of the embodiment of the invention, its key step comprises:
At first, at variable pump peripheral disposition load-sensitive oil circuit, this load-sensitive oil circuit is through a pressure compensation valve link variable pump, the oil circuit between variable pump and load-sensitive oil circuit is provided with throttle orifice;
⑵ adjusting joint discharge orifice make its flow relevant with aperture area, make the flow that enters executive component be proportional to throttle hole area, unnecessary flow directly returns fuel tank by pressure-compensated valve;
⑶ arrange a load sensing controlled valve and be complementary with the load sensing controlled volume adjustable hydraulic pump in internal system, and load pressure is compared with the hydraulic pump outlet pressure, drives the stroking mechanism of hydraulic pump;
⑷ utilize set shuttle valve that maximum load pressure is compared with the hydraulic pump outlet pressure when a plurality of executive component is arranged, and drives the stroking mechanism action of pump, changes the hydraulic pressure pump delivery.
Claims (1)
1. one kind middle-size and small-size excavator load sensitive system power-economizing method is characterized in that, mainly is comprised of following steps:
At first, at variable pump peripheral disposition load-sensitive oil circuit, this load-sensitive oil circuit is through a pressure compensation valve link variable pump, the oil circuit between variable pump and load-sensitive oil circuit is provided with throttle orifice;
⑵ adjusting joint discharge orifice make its flow relevant with aperture area, make the flow that enters executive component be proportional to throttle hole area, unnecessary flow directly returns fuel tank by pressure-compensated valve;
⑶ arrange a load sensing controlled valve and be complementary with the load sensing controlled volume adjustable hydraulic pump in internal system, and load pressure is compared with the hydraulic pump outlet pressure, drives the stroking mechanism of hydraulic pump;
⑷ utilize set shuttle valve that maximum load pressure is compared with the hydraulic pump outlet pressure when a plurality of executive component is arranged, and drives the stroking mechanism action of pump, changes the hydraulic pressure pump delivery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104629687A CN102943499A (en) | 2012-11-16 | 2012-11-16 | Energy-saving method for load sensitivity system of small and medium-sized excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104629687A CN102943499A (en) | 2012-11-16 | 2012-11-16 | Energy-saving method for load sensitivity system of small and medium-sized excavator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102943499A true CN102943499A (en) | 2013-02-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN2012104629687A Pending CN102943499A (en) | 2012-11-16 | 2012-11-16 | Energy-saving method for load sensitivity system of small and medium-sized excavator |
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| CN (1) | CN102943499A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1129964A (en) * | 1994-06-28 | 1996-08-28 | 日立建机株式会社 | Hydraulic circuit apparatus for hydraulic excavators |
| US5571226A (en) * | 1993-09-07 | 1996-11-05 | Kabushiki Kaisha Kobe Seiko Sho | Hydraulic device for construction machinery |
| CN1161394A (en) * | 1995-12-26 | 1997-10-08 | 日立建机株式会社 | Oil pressure control system for oil pressure working machine |
| CN102261351A (en) * | 2010-05-24 | 2011-11-30 | 上海三一科技有限公司 | Simple proportional load sensitive hydraulic system |
-
2012
- 2012-11-16 CN CN2012104629687A patent/CN102943499A/en active Pending
Patent Citations (4)
| 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 |
| CN1129964A (en) * | 1994-06-28 | 1996-08-28 | 日立建机株式会社 | Hydraulic circuit apparatus for hydraulic excavators |
| CN1161394A (en) * | 1995-12-26 | 1997-10-08 | 日立建机株式会社 | Oil pressure control system for oil pressure working machine |
| CN102261351A (en) * | 2010-05-24 | 2011-11-30 | 上海三一科技有限公司 | Simple proportional load sensitive hydraulic system |
Non-Patent Citations (1)
| Title |
|---|
| 李艳杰等: "挖掘机节能液压控制系统分析与应用", 《液压与气动》 * |
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Application publication date: 20130227 |