Excavator bucket rod confluent control device

Abstract

The invention relates to an excavator bucket rod confluent control device. The excavator bucket rod confluent control device comprises an oil tank, a first oil pump, a first direction valve, a swing arm control handle, a swing arm oil cylinder, a second direction valve, a second oil pump, a bucket rod control handle, a third direction valve, a third oil pump, a bucket rod oil cylinder, a first pipeline, a second pipeline and a third pipeline, wherein the second direction valve is further connected with a bucket rod confluent control valve; the upper end of a first spring on the bucket rod confluent control valve is combined with a plunger, and the lower end of the first spring is arranged on a valve element; the upper end of the plunger is provided with a second spring; a fourth direction valve is arranged on the upper end of the second spring; the first oil port of the fourth direction valve is connected with the swing arm control handle through the third pipeline; the second oil port of the fourth direction valve is connected with the oil outlet path of the first oil pump through the second pipeline; and the third oil port of the fourth direction valve is connected with the oil tank through the first pipeline. The excavator bucket rod confluent control device has the beneficial effects that the working efficiency of an excavator is improved; integrated design is adopted; the principle is simple; and control is easy.

Description

technical field [0001] The invention relates to an excavator stick confluence control device, in particular to a hydraulic drive device for hydraulic excavator stick cylinder operation confluence control. Background technique [0002] Large-scale hydraulic excavators are mainly engaged in excavation and loading operations, and the hydraulic drive device for excavation operations is mainly operated by the boom cylinder 5 and the stick cylinder 11. When digging, operate the arm control handle 8, the third directional valve 9 is opened, the oil output from the third oil pump 10 flows through the third directional valve 9, and at the same time, the second directional valve 6 operates, and the oil output from the first oil pump 2 flows through the bucket. Throttle valve, one-way valve and second directional valve 6 of rod confluence control valve 12, drive arm cylinder 11 to stretch out for excavation, when the digging force is not enough, operate boom control handle 4, first dir...

AI Technical Summary

Problems solved by technology

When digging, operate the arm control handle 8, the third directional valve 9 is opened, the oil output from the third oil pump 10 flows through the third directional valve 9, and at the same time, the second directional valve 6 operates, and the oil output from the first oil pump 2 flows through the bucket. Throttle valve, one-way valve and second directional valve 6 of rod confluence control valve 12, drive arm cylinder 11 to stretch out for excavation, when the digging force is not enough, operate boom control handle 4, first directional valve 3 opens, The oil output from the first oil pump 2 flows through the first directional valve 3 to drive the boom cylinder 5 to extend to lift the boom to reduce the load on the stick cylinder 11. The defect of this method is: operating the stick control handle 8 makes the bucket When the rod cylinder 11 is extended, the boom cylinder 5 is extended without operating the boom control handle 4, and the output oil of the first oil pump 2 flows through the throttle valve of the confluence control valve 12, causing the first oil pump 2 to output oil pressure. The average output oil pressure of the third oil pump is 10MPa higher, resulting in a decrease in the total flow of the first oil pump 2 and the third oil pump 10 to the stick cylinder 11 during excavation, thereby reducing the efficiency of the excavation operation

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