Hydraulic control loop, hydraulic loop control method and engineering machinery

Abstract

The embodiment of the invention provides a hydraulic control loop, a hydraulic loop control method and engineering machinery, and relates to the field the engineering machinery. The hydraulic controlloop involves an energy accumulator, a control valve set, a three-cavity hydraulic cylinder and a multi-way valve, wherein the three-cavity hydraulic cylinder is provided with a first containing cavity, a second containing cavity and a third containing cavity which are separated from one another; the first containing cavity is connected with the third containing cavity through the control valve set, one of the first containing cavity and the third containing cavity is connected with the energy accumulator through the control valve set, and the other of the first containing cavity and the thirdcontaining cavity is connected with the multi-way valve; the control valve set is used for controlling the first containing cavity to communicate with the third containing cavity, or used for controlling the one, connected with the energy accumulator, in the first containing cavity and the third containing cavity to communicate with an oil way of the energy accumulator; and the second accommodating cavity is connected with the multi-way valve, and the multi-way valve is used for being connected with a hydraulic pump and a hydraulic oil tank of the engineering machinery. The hydraulic controlloop, the hydraulic loop control method and the engineering machinery can play the energy-saving characteristic of a system, have good adaptability, and the mechanical structure of a boom does not need to be changed.

Description

technical field [0001] The invention relates to the field of construction machinery, in particular to a hydraulic control circuit, a hydraulic circuit control method and construction machinery. Background technique [0002] As an important construction and mining equipment, hydraulic excavator plays a very important role in the fields of engineering construction and ore mining. More than 60% of the earthwork operations in the world are completed by excavators. However, there is a lot of energy waste in the working process of the current excavator, especially the excavator arm, which is frequently lifted and lowered during the working process, and a large amount of energy is lost through the energy-saving function of the valve port. [0003] At present, there is a combination of a three-chamber cylinder and an accumulator to recover the gravitational potential energy when the boom is lowered. When the boom is lowered, the gravitational potential energy of the boom is stored ...

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