Excavator rotation brake energy recovery system

Abstract

The invention discloses an excavator rotation brake energy recovery system which comprises an engine, a variable pump, a transfer case, electromagnetic reversing valves, hydraulic control one-way valves, hydraulic control reversing valves, an energy accumulator, a rotary motor, a variable motor and a controller. Mechanical energy during excavator rotation braking is kinetic energy before excavator braking. According to the excavator rotation brake energy recovery system, the energy when the rotary motor is braked can be recovered, pressure oil is pressurized through a pressurizing valve to enable the recovered energy to be stored in the energy accumulator in a hydraulic energy mode, and when the energy is released, the hydraulic oil in the energy accumulator drives the variable motor and the engine after power distribution of the transfer case to drive a main pump to act on a work load. A hydraulic adjuster is composed of the pressurizing valve, the energy accumulator, the hydraulic control one-way valves and the variable motor, conversion links during energy recovery are reduced, the energy recovery efficiency is improved, the engine works in the high-efficiency area all the time, and oil consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of excavator energy saving, in particular to an excavator rotary braking energy recovery system. Background technique [0002] As an important construction machine for earthwork construction, excavator undertakes 65% to 70% of the earthwork excavation in the world. It has the characteristics of strong function and large market share, but its disadvantages of high fuel consumption and poor emission are becoming increasingly strict Under the background of emission regulations and high fuel prices, the research on its energy-saving technology has become an international research hotspot. The total efficiency of the excavator system is only about 20%, and the energy loss mainly includes: engine loss, throttling loss, hydraulic component loss, and mechanical device loss. At present, in response to the above problems, some excavator energy-saving technology research has been carried out in China, and many patent ...

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Problems solved by technology

[0003] Most of these energy-saving solutions use accumulators to recover the energy when the excavator brakes. Since the pressure of the recovered hydraulic energy is low, which is lower than the system pressure, the recovered energy cannot be released.

Some scholars have also proposed to convert the energy recovered during the braking of the excavator into electrical energy and store it in the battery. When it is ready to work, it will work together with the engine on the main pump. However, the dynamic response of the battery is slow, and the specific power is low when charging and discharging, and the hydraulic energy is converted into From mechanical energy to electrical energy, there are many energy conversion links, and the loss will increase accordingly, so the energy storage efficiency is very low

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