Movable arm flow re-generation system with potential energy recovery device for excavator

Abstract

The invention discloses a movable arm flow re-generation system with a potential energy recovery device for an excavator, and belongs to the technical field of engineering mechanical equipment. The system comprises a movable arm hydraulic cylinder, a three-position four-way servo valve, a controller, an overflow valve, an electromagnetic flow valve, a one-way valve, a variable output pump, an oil tank and an engine; the controller is electrically connected with the servo valve, the electromagnetic flow valve and the variable output pump; the three-position four-way servo valve is sequentially connected with a reversing valve and a hydraulic motor; the hydraulic motor is axially connected with a power generator; an output end of the power generator is electrically connected with a super capacitor; the outlet pressure of the hydraulic motor is controlled by the electromagnetic flow valve through the one-way valve of the motor; the reversing valve is connected with the oil tank; and the controller is electrically connected with the reversing valve, the power generator and the hydraulic motor. By the system, the optimal energy-saving state of the excavator can be realized during the falling of a movable arm, the energy consumption of the hydraulic system is reduced, the utilization ratio of the energy is improved, and the service life of the excavator is prolonged.

Description

Technical field [0001] The invention relates to construction machinery equipment, in particular to a boom flow regeneration system of a hybrid power hydraulic excavator, and belongs to the technical field of construction machinery equipment. Background technique [0002] At present, in the face of the energy crisis and the deterioration of the environment in today's world, energy conservation and emission reduction have become an important direction of industrial technology development. Excavators have the disadvantages of high energy consumption and low energy utilization rate in earthwork construction. The reciprocating movement of the excavator arm requires frequent braking and lifting. Most of the potential energy is consumed on the multi-way valve port, which not only causes energy waste, but also converts a large amount of potential energy into heat energy, which increases fuel consumption. Cause the hydraulic system to heat up and reduce the life of the components. ...

AI Technical Summary

Problems solved by technology

However, when the throttle valve (electromagnetic flow valve) is used to adjust the lowering speed of the boom hydraulic cylinder during the boom lowering process, more energy is wasted on the throttle valve port, and the energy utilization rate is low.

With the development of hybrid excavators, potential energy recovery technology has gradually become an important technical branch of boom energy saving. However, when the hydraulic motor is used alone to recover the potential energy of the boom's lowering, the energy in the lower chamber of the boom hydraulic cylinder still needs to be provided by the main pump. The overall energy efficiency is not high

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