Motor-driven hydraulic system for crane amplitude changing mechanism and action method thereof

Abstract

The invention discloses a motor-driven hydraulic system for a crane amplitude changing mechanism and an action method thereof, and belongs to the field of construction machinery. The motor-driven hydraulic system comprises an electric driving device and a hydraulic device; a battery supplies power to a controller, the controller adjusts the rotation direction and rotating speed of an electromotor,the electromotor drives a hydraulic motor, and when the hydraulic motor reversely drags the electromotor, the electric driving device can achieve the reversing drag power generation energy recovery;when the amplitude is increased, the electromotor rotates forward to drive the motor, pressure oil is output to be supplied to a rodless cavity of a hydraulic cylinder, a piston rod extends out, and the electricity energy is converted into the gravitational potential energy in the process; and when the amplitude in decreased, the electromotor rotates reversely, the pressure oil of the rodless cavity of the hydraulic cylinder drives the electromotor through the hydraulic motor, the electromotor is in a reversing drag power generation condition, the generated electric energy is stored in the battery, and the energy can be reused when the amplitude is increased. According to the motor-driven hydraulic system, the gravitational potential energy of a jib and the sling load is recovered and utilized when the amplitude is decreased, the energy consumption can be significantly lowered, the system efficiency is improved, and the heating is reduced.

Description

technical field [0001] The invention relates to the field of engineering machinery, and is mainly applied to the boom hydraulic cylinder luffing mechanism of lifting machinery such as automobile cranes, container reach stackers and aerial work vehicles, and is also suitable for hydraulic cylinder-driven lifting of lifting machinery such as container stackers. The mechanism uses the electric drive device as the power source of the hydraulic system to realize the energy recovery and reuse during the luffing and lowering action and the lowering process. Background technique [0002] During the operation of hoisting machinery such as truck cranes and container reach stackers, it is necessary to change the working range, which is usually achieved by changing the elevation angle of the boom through the expansion and contraction of the piston rod of the hydraulic cylinder. [0003] The hydraulic cylinder is a single-rod double-acting piston cylinder, and the speed regulation mode o...

AI Technical Summary

Problems solved by technology

Diesel engines are large in size, low in efficiency, loud in noise, and polluting in emissions, which do not conform to the general trend of energy conservation and emission reduction in environmental protection

Images