Three-pump confluence control device for dredger

The utility model discloses a three-pump confluence control device of the excavator, and comprises a confluence valve arranged in the hydraulic circuit and hydraulic controllers. The three-pump confluence control device is characterized in that the confluence valve is equipped with the ratio adjustment, and the flow control end of the confluence valve is connected with the hydraulic controllers; the three-pump confluence control device also comprises pressure sensors which are respectively arranged in the pumps P1, P2 and P3; the output ends of the pressure sensors are respectively connected with the corresponding input end of the hydraulic controller; and the detection ends of hydraulic controller are respectively connected with the guide pressure sensors on the actuating elements which are driven by the pumps P1 and P2. The utility model acquires the data of measurement through the confluence valve with the ratio adjustment, according to each pressure sensor; the controller are used for judging the starting, closing and flow rate of the confluence valve; thus the utility model realizes the real-time and quantitative three-pump confluence, so that the excavator can adapt to the operation conditions; the operating efficiency is improved; and the energy consumption is reduced.