Gravitational potential energy recycling and reutilization energy-saving device based on four-port hydraulic transformer

Abstract

The invention discloses a gravitational potential energy recycling and reutilization energy-saving device based on a four-port hydraulic transformer. The device comprises an energy-saving device and aboom cylinder, the energy-saving device comprises the four-port hydraulic transformer, a two-way proportional throttle valve, a two-position three-way reversing valve, a normally-closed electromagnetic valve, an energy storage device and a controller, through the energy-saving device, hydraulic energy obtained through converting of gravitational potential energy in the excavator movable arm descending process is stored in the energy storage device, on the premise of not affecting the excavator operation and movable arm motion stability, energy stored in the energy storage device is released,through pressure transforming of the four-port hydraulic transformer, the energy is used for the excavator movable arm lifting condition, throttling losses generated when oil passes through a hydraulic valve in an original hydraulic system during movable arm descending can be avoided, and the efficiency of the hydraulic system is improved.

Description

technical field [0001] The invention relates to an energy-saving device in a hydraulic transmission and control system, in particular to a gravitational potential energy recovery and reuse energy-saving device based on a four-port hydraulic transformer. Background technique [0002] At present, hydraulic excavators are widely used in mining, river cleaning, infrastructure construction, etc., but they have problems such as high energy consumption and low efficiency of hydraulic systems. Energy recovery research is one of the hot issues in the field of construction machinery such as hydraulic excavators. In typical working conditions of hydraulic excavators, the recoverable energy of the boom accounts for more than 40% of the total recoverable energy of the whole machine, which is the key to energy recovery. preferred object. [0003] Since the boom needs to be lifted and lowered frequently during the working process of the excavator, when the boom is falling, the potential e...

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Problems solved by technology

[0003] Since the boom needs to be lifted and lowered frequently during the working process of the excavator, when the boom is falling, the potential energy of the boom is converted into heat energy through the throttling effect of the valve port in a system without a potential energy recovery device, which not only wastes energy, but also Make the quality of hydraulic oil worse

[0004] Some of the existing excavator hydraulic energy recovery devices adopt the method of power generation-energy storage-electric release, the device is complicated, there are many energy conversion links, and the recovery efficiency is low; most of the hydraulic recovery adopts the scheme of quantitative motor and variable pump tow, The structure is complex, the volume is large, the weight is heavy, the cost is high, and a new type of hydraulic transformer is used. Due to its own structure and principle, the flow rate also changes when the transformation ratio is changed, which affects the control performance of the excavator and Causes unstable motion of the actuator

When the hydraulic excavator is working, the potential energy generated when the large-mass boom is lifted is converted into heat energy and dissipated through the throttling of the hydraulic valve when it is lowered. High, in order to prevent the oil from being unusable due to the decrease in viscosity due to overheating, an additional cooling device with a larger specification is required to cool down, which increases the installed cost and working power of the hydraulic excavator

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