Energy-saving hydraulic system and engineering machine

Abstract

The invention provides an energy-saving hydraulic system and an engineering machine and relates to the field of engineering machinery. The energy-saving hydraulic system comprises a first oil way system for controlling the motion speed and direction of the system, a second oil way system mechanically connected with the first oil way system and performing synchronous motion and a third oil way system mechanically connected with the first oil way system and used for storing and releasing energy. The energy-saving hydraulic system solves the synchronization problem of multiple execution elements while achieving energy recovery and utilization, is small in throttling loss and high in efficiency in the energy recovery and utilization process and can effectively reduce energy consumption and improve product performance.

Description

technical field [0001] The invention relates to the field of construction machinery, in particular to an energy-saving hydraulic system and construction machinery. technical background [0002] At present, construction machinery such as excavators or cranes that use oil cylinder luffing, in the speed control, mostly use components such as balance valves or throttle valves to offset the pressure of the load when pitching or descending, so as to control the pitching or descending. The speed makes the moving parts fall smoothly and safely. During this process, the gravitational potential energy of the load is all consumed on the throttling element, resulting in energy waste. For example, in existing technologies such as patent CN201210080014, energy recovery is also carried out to solve this problem, but the utilization rate of recovered energy is low, and in the working condition where there are multiple actuators such as two oil cylinders lifting or pitching at the same time,...

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Problems solved by technology

[0002] At present, construction machinery such as excavators or cranes that use oil cylinder luffing, in the speed control, mostly use components such as balance valves or throttle valves to offset the pressure of the load when pitching or descending, so as to control the pitching or descending. The speed makes the moving parts fall smoothly and safely. In this process, the gravitational potential energy of the load is all consumed on the throttling element, resulting in energy waste.

For example, in existing technologies such as patent CN201210080014, energy recovery is also carried out to solve this problem, but the utilization rate of recovered energy is low, and in the working condition where there are multiple actuators such as two oil cylinders lifting or pitching at the same time, multiple actuators Synchronization of is also often an unsolvable problem

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