Abstract: A rotatory energy recycling control device for a hydraulic excavator, comprising: an oil line selector valve (1), a direction selector valve (2), a sequencing valve (3), a one-way valve (4) and an overflow valve (5); two oil inlets of the oil line selector valve (1) are respectively connected to an opening A and an opening B of a rotary motor; an oil outlet of the oil line selector valve (1) is connected to an inlet of the direction selector valve (2); an outlet of the direction selector valve (2) is connected to an net of the sequencing valve (3); a drainage port of the sequencing valve (3) is connected to an oil tank; an outlet of the sequencing valve (3) and an net of the one-way valve (4) communicate with the overflow valve (5): the outlet of the one-way valve (4) is connected to an energy storage and utilization device; and an outlet of the overflow valve (5) is connected to the oil tank.

Abstract: An energy-saving control system of an excavator, including an engine, a main pump (1), a pilot handle, a pilot pressure pump (2), pilot control valves (4), a controller, a main control multi-way valve (3) and an execution mechanism. The main pump controls the execution mechanism via the main control multi-way valve (3). The oil paths connecting the main pump to the execution mechanism are provided with high pressure sensors (6) for transmitting signals to the controller. The main pump adjusts the flow rate thereof according to the pressure of a negative feedback oil path. The oil paths interconnecting the output end of the pilot handle with the main pump is provided with electromagnetic proportional reducing valves (7) and shuttle valves (8). A pilot oil path sequentially passes through the electromagnetic proportional reducing valves (7) and the shuttle valves (8) to control the flow rate of the main pump.

Abstract: A rotatory energy recycling control device for a hydraulic excavator, comprising: an oil line selector valve (1), a direction selector valve (2), a sequencing valve (3), a one-way valve (4) and an overflow valve (5); two oil inlets of the oil line selector valve (1) are respectively connected to an opening A and an opening B of a rotary motor; an oil outlet of the oil line selector valve (1) is connected to an inlet of the direction selector valve (2); an outlet of the direction selector valve (2) is connected to an net of the sequencing valve (3); a drainage port of the sequencing valve (3) is connected to an oil tank; an outlet of the sequencing valve (3) and an net of the one-way valve (4) communicate with the overflow valve (5): the outlet of the one-way valve (4) is connected to an energy storage and utilization device; and an outlet of the overflow valve (5) is connected to the oil tank.