Control system and control method for improving leveling performance of excavator

Abstract

The invention discloses a control system and a control method for improving the leveling performance of an excavator. The system and the method are mainly characterized in that the middle-position normally-open state of a logic valve control valve core is improved into the middle-position normally-closed state, at the moment, as long as the combined operation of bucket rod excavation and movable arm ascending is carried out, an oil path, located at the position of a logic valve main valve core of a logic valve at the front end of a bucket rod is in a throttling state, therefore, the bucket rod and a movable arm do not affect each other when operated at the same time, the digging speed of the bucket rod is not affected by switching of the logic valve, the speed of the bucket rod is stable, and the problem that two pits which cannot be controlled appear at the beginning stage of the leveling process is solved, when the movable arm descends and the bucket rod extends outwards, the logic valve control valve core is opened, and the logic valve main valve core does not throttle any more. The discharging speed of the bucket rod is ensured, meanwhile, a lengthened nozzle is additionally arranged at the front end of the bucket rod logic valve main valve core, a throttling hole is added, so that the pressure impact of the logic valve main valve core in the switching process can be reduced.

Description

technical field [0001] The invention relates to the technical field of electro-hydraulic control of a hydraulic excavator, in particular to a control system and a control method for improving the leveling performance of an excavator. Background technique [0002] The leveling performance of an excavator is an important item to evaluate the handling performance of an excavator, and the leveling of an excavator is mainly a combined operation of the boom and the stick, so the flow distribution when the boom and the stick are operated at the same time determines the leveling performance. Superiority. [0003] When the excavator performs leveling operations, it is necessary to ensure that the trajectory of the bucket teeth on the ground is a horizontal line through the raising of the boom and the digging of the stick. Since the load of the boom is high and the load of the stick is light during the leveling process, the boom and the stick are operated at the same time. When using...

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a control system and control method for improving the leveling performance of an excavator, which are used to solve the problems of poor control of the excavator's nodding at the initial stage of leveling, and the mutual influence caused by the mutual influence of the stick and the boom when operating at the same time. The stick speed is not controlled at the beginning of the flat, and two uncontrollable dimples are formed in the flat position

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