A control system and control method for improving leveling performance of an excavator

Abstract

The invention discloses a control system and a control method for improving the leveling performance of an excavator. The main point of improvement is that the logic valve control spool is improved from a long-open position in the middle position to a normally closed position in the middle position. The arm rises compound operation, the logic valve at the front end of the stick is throttled at the main spool position of the logic valve, so the stick and the boom no longer affect each other when they are operated at the same time, and the digging speed of the stick is not affected by the switching of the logic valve. The speed of the stick is stable, which solves the problem of two uncontrollable pits at the beginning of the leveling process. When the boom is lowered and the stick is extended, the logic valve controls the spool to open, and the logic valve main spool no longer throttles , to ensure the unloading speed of the stick, and at the same time, the front end of the main spool of the stick logic valve is increased with an extension nozzle and an orifice, which can reduce the pressure impact of the main spool of the logic valve during the switching process.

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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