Boom cylinder energy-saving system and its control method, excavator

Abstract

The invention provides a boom cylinder energy-saving system, a control method thereof and an excavator, and relates to the technical field of engineering machines. The boom cylinder energy-saving system comprises a main pump, a variable-displacement hydraulic motor, a one-way clutch, a boom cylinder, an energy recovery valve block and an energy accumulator. When a boom descends, a boom valve element blocks an oil return port for descending of the boom cylinder, so that return oil is guided into the energy accumulator for conversion-free energy storage. When the boom ascends, the return oil in the energy accumulator is released through the energy recovery valve block and used for driving the variable-displacement hydraulic motor to rotate, and thus auxiliary torque is provided for the main pump. According to the boom cylinder energy-saving system, the descending potential energy of the boom cylinder is stored, so that recovery and reutilization of energy are achieved, and the energy-saving effect is good. The control method of the boom cylinder energy-saving system is easy to operate, safe and reliable and increases the utilization rate of high-pressure hydraulic oil. According to the excavator, the descending potential energy of the boom is recovered and reutilized, the output power of the energy is reduced, and the energy-saving purpose is achieved.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to an energy-saving system for a boom oil cylinder, a control method thereof, and an excavator. Background technique [0002] Among the current construction machinery, the use of excavators has been greatly promoted and applied, but the total utilization rate of its energy is low. The realization of energy saving and emission reduction by hydraulic excavators has always been the most sought-after goal of the industry. [0003] During the lowering process of the boom of the traditional excavator, the lowering potential energy of the entire working device is converted into heat waste through hydraulic interception. Moreover, the conversion of the falling potential energy into heat energy will also lead to a decrease in fuel efficiency, an increase in hydraulic oil temperature, and a reduction in the service life of hydraulic components. [0004] At present, the research...

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Problems solved by technology

[0005] In view of this, it is the current construction machinery technology to design and manufacture a boom cylinder energy-saving system, which can recover and reuse the descending potential energy, reduce the output power of the engine, and realize the purpose of energy saving in view of the waste of the descending potential energy during the descending process of the boom. Technical issues that urgently need to be improved in the field

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