Excavator hydraulic control system and excavator

Abstract

This invention relates to the field of excavators, and discloses an excavator hydraulic control system and an excavator. The excavator hydraulic control system includes: a main pump, coaxially connected to a pilot pump, both of which are connected to an oil tank; a main valve, connected to the main pump via a main inlet oil circuit; a first solenoid valve and a second solenoid valve, connected to the pilot pump via a pilot main oil circuit, with the first solenoid valve connected to one end of the main valve via a first pilot oil circuit, and the second solenoid valve connected to the other end of the main valve via a second pilot oil circuit; a back pressure valve, connected to the first solenoid valve via a first pilot oil circuit and connected to the oil tank via a pilot return oil circuit; and an attachment cylinder, with its rodless chamber connected to the main valve via a first oil circuit, and its rod chamber connected to both the back pressure valve and the main valve via a second oil circuit. The first oil circuit is equipped with a first regulating valve, and the second oil circuit is equipped with a second regulating valve. The return oil from the attachment cylinder, after passing through the second regulating valve, returns to the oil tank via either the main valve or the back pressure valve, significantly reducing the back pressure of the attachment cylinder's return oil.

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