Independent electrohydraulic load sensitive energy regeneration hydraulic system of engineering machinery load port

Abstract

The invention discloses an independent electrohydraulic load sensing energy regeneration hydraulic system of an actuator port of an engineering machine. An oil outlet of a variable pump is connected with an oil inlet of a proportional relief valve, a first pressure sensor, an oil inlet of a first proportional directional valve, and an oil inlet of a second proportional directional valve respectively. An oil outlet of the first proportional directional valve is connected with a second pressure sensor, the oil inlet of a proportional throttle valve and a rodless cavity of a hydraulic cylinder respectively. An oil outlet of the second proportional directional valve is connected with an oil outlet of the proportional throttle valve, a third pressure sensor and a rod cavity of the hydraulic cylinder. A Controller is in electrical connection with a control handle, the variable pump, the proportional relief valve, two proportional directional valves, the proportional throttle valve and three pressure sensors. The system adopts the pressure sensors to detect working conditions, selects control policies according to the working conditions, reduces energy loss in flow restriction and realizes overload energy regeneration under the control of an actuator. Speed and energy-conservation control is realized through the combination of pump control and valve control.

Description

technical field [0001] The invention relates to a hydraulic control system featuring electro-hydraulic control technology, in particular to an independent electro-hydraulic load-sensitive load compensation energy regeneration hydraulic system for a construction machinery load port. Background technique [0002] In recent years, with the development of electronic technology and testing technology, hydraulic systems have put forward higher and higher requirements for control performance and energy consumption control. Construction machinery mostly adopts diesel engine-hydraulic system-multi-actuator drive scheme. Due to its working conditions The complex, high-efficiency, high-precision, and energy-saving control system design has received extensive attention in the industry. [0003] At present, the research on the control performance of construction machinery is mainly reflected in the following three aspects: improving the performance of working components (diesel engine an...

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Problems solved by technology

However, the traditional control element multi-way valve, due to the linkage between the inlet and the outlet, under normal impedance load conditions, the back cavity pressure is maintained at a relatively high value, which reduces the energy-saving performance of the system. Realize energy regeneration control; while the power hydraulic cylinders in construction machinery have to lift and lower heavy objects repeatedly. During the process of lowering heavy objects, their inertial energy, gravitational potential energy and energy are all converted into throttling losses of the hydraulic system, which not only causes energy loss Waste, but also cause heat, noise, vibration and reduce life expectancy and other hazards

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