System for differential recovery of potential energy of boom of oil liquid hybrid power excavating machine

Abstract

The invention discloses a system for differential recovery of potential energy of a boom of an oil liquid hybrid power excavating machine. The system comprises a variable capacity pump, a multi-channel valve, a boom cylinder, an operating handle, a controller, a hydraulic control reversing valve, a hydraulic control reversing and throttling valve, a hydraulic control unloading valve, an energy accumulator, an electro-hydraulic proportional valve and a one-way valve. The controller is used for controlling the electro-hydraulic proportional valve and the variable capacity pump according to pressure at an outlet of the variable capacity pump and a pressure signal of the energy accumulator, thereby solving the flow distribution problem of the energy accumulator and the variable capacity pump. The energy accumulator is an energy storage element which can transform descending kinetic energy and potential energy of the boom to hydraulic energy and reasonably distribute the energy for a main power source and an auxiliary power source, and a working device is driven by the pump-energy accumulator. The system can avoid the waste of a large amount of the descending kinetic energy of the boom, reduce the energy transformation link, enable an engine to stably work in a high-efficient fuel oil region, improve the fuel coil economy of the excavating machine and reduce the emission of the system.

Description

technical field [0001] The invention relates to a potential energy recovery system, in particular to a potential energy differential recovery system for an oil-liquid hybrid excavator arm. Background technique [0002] Ordinary hydraulic excavators do not recycle the downward potential energy of the excavator arm, so that the downward potential energy of the boom is lost in the form of heat energy at the throttle port, which not only causes the system energy to be lost in vain, but also increases the temperature rise of the system, causing hydraulic pressure such as cavitation. System flaws. In addition, the working cycle of the excavator is relatively short and the frequency is high, so that the recyclable boom lowering potential energy is considerable. Therefore, the development of a set of potential energy recovery system for hydraulic excavator boom lowering can not only improve the hydraulic system of the excavator, but also save energy. [0003] At present, the energ...

AI Technical Summary

Problems solved by technology

The parallel hybrid hydraulic excavator systems of Komatsu and Hitachi use a separate hydraulic motor-generator to control the kinetic energy and potential energy of the boom lowering. The hydraulic motor of this system is connected in parallel in the oil circuit. When the boom is raised, the control valve exists. Large throttling loss

The above hybrid hydraulic excavator potential energy recovery system converts potential energy into electrical energy and stores it in the battery. There are many energy conversion links and energy storage components are expensive, which makes it difficult for this potential energy recovery system to be widely used.

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