Movable arm potential energy recovery method and apparatus of hydraulic excavator

A potential energy recovery and maneuvering arm technology, which is applied to fluid pressure actuating devices, mechanically driven excavators/dredgers, circuit devices, etc., can solve problems such as low efficiency, large fluctuations in hydraulic oil pressure, and low energy recovery efficiency. To achieve the effect of reducing pressure fluctuation, improving efficiency and improving work efficiency

Inactive Publication Date: 2009-05-20
CENT SOUTH UNIV
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AI Technical Summary

Problems solved by technology

Since the energy recovery time during the lowering process of the hydraulic excavator arm is usually less than 2 seconds, and the pressure fluctuation of the hydraulic oil during the recovery process is large, the generator works in a low efficiency area, and the efficiency of energy recovery is very low

Method used

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  • Movable arm potential energy recovery method and apparatus of hydraulic excavator

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Embodiment 1

[0021] Such as figure 1 As shown, the oil-electric hybrid hydraulic excavator arm potential energy recovery device includes a hydraulic cylinder 3, a controller 1, an accumulator 2, a two-position two-way solenoid valve 4, 5 and 7, and a two-position two-way proportional valve 6 ( Wherein the two-position two-way solenoid valves 4, 7 and 5 and the two-position two-way proportional valve 6 respectively correspond to the first solenoid valve, the second solenoid valve, the third solenoid valve and the fourth solenoid valve) and the generator 9 , hydraulic motor 10, inverter 11, accumulator 12 and oil tank 8, two-position two-way solenoid valves 4, 5 and 7 are normally closed solenoid valves, two-position two-way proportional valve 6 is a normally closed proportional valve, two The two-position two-way solenoid valve 4 is installed between the oil port of the rod chamber of the hydraulic cylinder 3 and the fuel tank 8, the two-position two-way solenoid valve 7 is installed betwee...

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Abstract

The invention discloses a method for recovering potential energy of a movable arm of a hydraulic digging machine and a device thereof. The method comprises the following steps: firstly, the potential energy is stored through an energy accumulator in the retraction process of a hydraulic cylinder; and secondly the stored energy in the energy accumulator drives a generator to generate electricity, thereby realizing the recovery of the potential energy of the movable arm of the hydraulic digging machine. A mode for storing the potential energy is to convert the potential energy into pressure energy. The energy accumulator and the generator are connected through a proportioning valve so as to control the rotational speed of the generator. The method realizes high-efficiency recovery of the potential energy of the movable arm of the hydraulic digging machine; the principle of the method is to skillfully change the working time of hydraulic oil for power generation through the function of energy storage of the energy accumulator and provide effective buffering for recovering the potential energy; in addition, through the throttling control of the proportioning valve, the method reduces pressure fluctuation of the hydraulic oil in the power generation process, realizes the adjustment of the working rotational speed of the generator, improves the working efficiency of the generator and further improves the efficiency of energy recovery.

Description

technical field [0001] The invention belongs to the technical field of mechatronics, and relates to a method and a device for recovering potential energy of a hydraulic excavator arm. Background technique [0002] The hydraulic excavator is a typical periodic operation equipment, and the lowering of the boom is a typical part of its work cycle. When the boom of the hydraulic excavator is lowered, the ordinary hydraulic excavator adjusts the lowering speed of the working arm through the opening of the control valve, and stops the lowering movement of the boom by closing the control valve. Ordinary hydraulic excavators usually do not have an energy recovery device, and most of the potential energy released during the lowering of the boom is consumed on the control valve, resulting in a waste of energy. [0003] Since the hybrid hydraulic excavator is equipped with a battery and a generator, it can theoretically recover the potential energy during the lowering of the hydraulic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B21/14H02J7/14E02F3/38
Inventor 黄中华刘少军
Owner CENT SOUTH UNIV
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