Single-pump flow priority and differential control hydraulic system, control method and compression garbage truck

Abstract

The invention discloses a single-pump flow priority and differential control hydraulic system. According to the system, a main oil way is provided with a metering pump, a three-way flow valve and a main overflow valve connected with the three-way flow valve in parallel; the barrel overturning oil cylinder is connected with the main oil way through a first reversing valve, a working oil port of the first reversing valve is connected with an oil inlet of the barrel overturning oil cylinder, and the first reversing valve is used for switching directions or stopping an oil way between the oil inlet and the working oil port of the first reversing valve, so that the action of the barrel overturning oil cylinder is realized; an oil inlet of the scraper oil cylinder is connected with a second reversing valve, and the scraper oil cylinder acts through direction switching or cut-off of an oil way between an oil inlet of the second reversing valve and the working oil port; an oil inlet of the sliding plate oil cylinder is connected with a third reversing valve, and the sliding plate oil cylinder acts through direction switching or cut-off of an oil way between the oil inlet of the third reversing valve and the working oil port.

Description

technical field [0001] The invention relates to a single pump flow priority and differential control hydraulic system, a control method and a compression type garbage truck, belonging to the technical field of sanitation machinery. Background technique [0002] The garbage collection by the compression garbage truck mainly includes two working conditions: the feeding cycle operation and the compression cycle operation. Due to the poor working conditions of garbage collection, the operator's demand for improving the collection efficiency is increasing. The hydraulic system of the compression garbage truck has evolved from a single-pump hydraulic system to the current mainstream dual-pump hydraulic system, which realizes the synchronous action of feeding and compression, but the system increases components and pipelines accordingly, increasing the cost; in addition, the compression operation It includes the actions of the scraper and the slide plate. The scraper and the slide ...

AI Technical Summary

Problems solved by technology

The compression garbage truck hydraulic system has evolved from a single-pump hydraulic system to the current mainstream dual-pump hydraulic system, which realizes the synchronous action of feeding and compression, but the system correspondingly increases components and pipelines, which increases the cost; in addition, the compression operation Including the action of two mechanisms of scraper and slider, the scraper and slider are still the mainstream in the industry, and the compression cycle of this design takes a long time, which is not conducive to improving work efficiency; at the same time, the slider in the industry uses a slider cylinder The large cavity oil inlet slide plate descends and the small cavity oil intake slide plate rises mostly.

In this design, when the slide plate descends, the load force on the entire compression mechanism is in the same direction as the cylinder movement, which is a negative load condition. This condition often causes insufficient oil supply to the large cavity of the slide plate cylinder, resulting in cavitation and crawling

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