Hydraulic excavator boom circuit and its control method based on hydraulic transformer

Abstract

The invention provides a hydraulic excavator movable arm loop based on a hydraulic transformer and a control method thereof, and belongs to the technical field of hydraulic excavators. The hydraulic excavator movable arm loop based on the hydraulic transformer is characterized in that a port A of the hydraulic transformer (6) is connected with a high voltage network (4), a first pilot operated check valve (10) is connected between a port B of the hydraulic transformer (6) and a first movable arm hydraulic cylinder (11), another first pilot operated check valve (10) is connected between the port B of the hydraulic transformer (6) and a second movable arm hydraulic cylinder (12), a second pilot operated check valve (13) is connected between the port A of the hydraulic transformer (6) and the first movable arm hydraulic cylinder (11), a third magnetic exchange valve (15) is connected between the port A of the hydraulic transformer (6) and the second movable arm hydraulic cylinder (12), and a first safety valve (7) is connected between the port B of the hydraulic transformer (6) and the first pilot operated check valve (10). A hydraulic transformer control assembly (5) is controlled by a controller (19) according to an operating handle control signal (S), a hydraulic transformer thrust plate intersection angle signal and a hydraulic transformer rotating speed signal to enable the movable arm to stably operate at an expected speed. The hydraulic excavator movable arm loop based on the hydraulic transformer and the control method have the advantages of being easy to operate, high in control precision, work efficiency and energy recovery efficiency, low in cost and free of throttling loss.

Description

technical field [0001] The invention belongs to the technical field of hydraulic excavators, and in particular relates to a hydraulic transformer-based hydraulic excavator arm circuit and a control method thereof. Background technique [0002] In recent years, with the increasingly serious problems of resource shortage and environmental pollution worldwide, research on energy saving and emission reduction of hydraulic excavators has become an important direction for the development of the excavator industry. During the working process of the hydraulic excavator, the boom needs to be lifted and lowered frequently. Traditional hydraulic excavators control the movement speed of the boom by changing the valve port area of ​​the multi-way valve, so there will be a lot of throttling loss. And because there is a lot of gravitational potential energy in the lowering process of the boom, most of the gravitational potential energy is consumed on the valve port of the multi-way valve ...

AI Technical Summary

Problems solved by technology

The former will increase the overall size of the hydraulic cylinder of the boom, and the latter will increase the size of the hydraulic pressure transformer, which will increase the installed power of the system and increase the production cost

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