Lowing control system for movable arm of hydraulic excavator for mines

Abstract

The invention discloses a lowering control system for a movable arm of a hydraulic excavator for mines, and relates to a hydraulic excavator. The system solves the problems that the prior art can only control the lowering speed of the movable arm and cannot utilize the impact energy generated by dead weight so as to cause energy waste. The system consists of a main pressure oil passage and a pilot control oil passage, wherein the main pressure oil passage consists of a left shunt block, a right shunt block, a left one-way throttling valve, a left movable arm cylinder, a safety valve, a right movable arm cylinder, a right one-way throttling valve and a hydraulic pipeline; and the pilot control oil passage consists of a remote control valve, an electromagnetic switching valve, a left movable arm cylinder one-way valve, a left movable arm cylinder regeneration valve, a right movable arm cylinder regeneration valve, a right movable arm cylinder one-way valve, an oil tank and a hydraulic pipeline. In the process of lowering the movable arm, the impact energy generated by lowering due to the dead weight of the movable arm is fully utilized for regeneration, so energy is saved, heating of a hydraulic system is reduced, lowering of the movable arm is quickened, and the work efficiency of the hydraulic system of the hydraulic excavator for mines is improved.

Description

technical field [0001] The invention relates to a hydraulic excavator, in particular to a control system for lowering the arm of the mining hydraulic excavator. Background technique [0002] Mining hydraulic excavators are widely used in large open-pit mines, and the boom is an important part of hydraulic excavators. When the boom is lowered, the boom will drop rapidly due to its own weight, and the boom will be damaged if it falls too fast. In the hydraulic system of the mining hydraulic excavator, the boom cylinder is responsible for the lifting and lowering of the boom. Therefore, in order to realize the controllable lowering speed of the boom, buffer elements such as balance valves and one-way throttle valves are added to the hydraulic system of the existing mining hydraulic excavator, so that the boom can be lowered safely and reliably. [0003] The boom lowering control system of the prior art is as figure 1 As shown, the system includes: left diverter block 1, righ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art, to provide a hydraulic excavator arm lowering control system for mining, to solve the problem that the existing hydraulic excavator arm lowering control system can only control the lowering speed of the boom, and cannot The impact energy generated by its own weight is utilized, resulting in the problem of energy waste

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