Flow regeneration valve group, excavator control system and hydraulic excavator

Abstract

The invention discloses a flow regeneration valve group, an excavator control system and a hydraulic excavator, the flow regeneration valve group (100) comprises a regeneration oil inlet (Cb), a regeneration control valve (1) with a regeneration working oil port (Pb), an oil return control valve (2) with a regeneration oil return port (Tb) and a feedback control valve (3) with a feedback pilot oil port (LCb), the regeneration working oil port, the regeneration oil return port and the feedback pilot oil port are all independent oil outlets, the regeneration control valve, the oil return control valve and the feedback control valve are all on-off valves which are connected with the regeneration oil inlet in parallel, and the opening degree of valve ports of the regeneration control valve and the oil return control valve in the conducting state can be adjusted. Return oil of a rodless cavity of the piston retraction stroke of the movable arm oil cylinder can be recycled and guided into other hydraulic executing mechanisms working normally through the flow regeneration valve set, the recovery speed of a piston rod of the movable arm oil cylinder can be controlled through the feedback control valve, the flow of regenerated oil is adjusted through the opening degree of a valve port, and the purpose of optimizing energy saving is achieved.

Description

technical field [0001] The invention belongs to the field of construction machinery, and in particular relates to a hydraulic excavator, a control system thereof and a flow regeneration valve group. Background technique [0002] In the hydraulic control system of medium and large excavators, usually when the boom is lowered, a main pump pumps high-pressure oil, through the boom control main valve in the multi-way valve, to the rod chamber of the boom cylinder, accompanied by When the boom is lowered, the hydraulic oil in the rodless chamber of the boom cylinder returns to the oil tank, or a part of the hydraulic oil flows back to the rod chamber of the boom cylinder through the boom control main valve. [0003] Since the weight of the working device of the excavator accounts for about 1 / 4 of the weight of the whole machine, in order to prevent the boom from falling and stalling, the rodless cavity of the boom cylinder needs to have enough pressure to overcome the weight of t...

AI Technical Summary

Problems solved by technology

Therefore, there is a lot of throttling loss and energy waste during the boom lowering process

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