Automatic manual walking hydraulic electrical system of crawler excavator

Abstract

An automatic-manual walking hydraulic-electrical system for a crawler belt type excavator is provided. A pressure oil port of a three-position four-way proportional electromagnetic valve is connectedto a two-position four-way electromagnetic valve; when electrified, the two-position four-way electromagnetic valve is connected to a P port of a walking pilot valve; upon disconnection, an oil path is disconnected; two output ends of the three-position four-way proportional electromagnetic valve are respectively connected to two two-position three-way electromagnetic valves; left and right inlet / outlet pressure oil does not communicate when the two-position three-way electromagnetic valves are disconnected; two oil outlets communicates upon connection of the two-position three-way electromagnetic valves; at a manual control state, an electrical system controls the two-position four-way electromagnetic valve to be electrified and the two-position three-way electromagnetic valves and the three-position four-way proportional electromagnetic valve to be disconnected; at an automatic control state, the electrical system controls the two-position four-way electromagnetic valve to be disconnected, and the two-position three-way electromagnetic valves and the three-position four-way proportional electromagnetic valve to be connected. The automatic-manual walking hydraulic-electrical system for the crawler belt type excavator is advantageous in that the excavator can be operated to walk via a manual / automatic way, so labor intensity can be reduced; and the excavator can be remotely controlled to walk via a wireless way.

Description

technical field [0001] The invention relates to a hydraulic electrical system for automatic and manual travel of a crawler excavator, in particular to a hydraulic electrical system for automatic and manual travel of a crawler excavator. Background technique [0002] As a fast and efficient construction machine, the hydraulic excavator is a main type of construction machinery and one of the main mechanical equipment in earthwork construction projects. It is known as the "king of construction machinery" in the industry. It is widely used in Mechanized construction in industries such as industrial and civil construction, transportation, water conservancy and electric power engineering, farmland transformation, mining and modern military engineering. [0003] At present, the walking of the excavator can only be realized by the hydraulic valve controlled by the walking pilot valve, which cannot realize the automatic driving and walking function of the excavator. The driver is pro...

AI Technical Summary

Problems solved by technology

[0003] At present, the walking of the excavator can only be realized by the hydraulic valve controlled by the walking pilot valve, which cannot realize the automatic driving and walking function of the excavator. The driver is prone to fatigue when walking a long distance, and the manual operation of the walking pilot valve is likely to cause pilot pressure fluctuations, which will cause excavation. The excavator walks shaking, adding electronic control can realize automatic control of the excavator walking, which can reduce the back and forth shaking of the excavator caused by human operation when the excavator walks in a straight line

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