Kobelco excavator multi-pump multi-channel variable, quantitative mixing system is a new type of hydraulic system, which can make full use of the power of the excavator and make the excavator better suitable for the requirements of various operations, SC-150 hydraulic excavator The adopted multi-pump multi-channel variable quantitative mixing system consists of two full-power variable axial piston pumps A and B with a flow rate of 2×110L/min and a quantitative pump C with a flow rate of 43L/min. A drives the left travel motor 8 through the distribution valve group 7; pump B drives the right travel motor 9 and the swing motor 10 through the distribution valve group 17; pump C drives the boom cylinder 13, the stick cylinder 12 and the bucket cylinder 1 through the distribution group 6 The operating valve 14 has three positions: when it is at the 0 position, the oil output of the distribution valve groups 17 and 7 is supplied by the confluence valve 15 to the oil cylinders, such as the arm, the stick and the bucket, and the rotary motor can also operate at the same time. At this time, there is always in the system. A fixed pump and a variable pump supply oil to the three working cylinders; when working in the 1 position, the pumps A, B and C do not merge, and they work separately. At this time, the boom lifting, the turntable rotation and the excavator can move at the same time. Proceed; You can also walk normally (because pump C does not merge with pump C). The pressure of the fixed pump C can reach 40MPa, so the lifting capacity can be increased by 25%, and the heavy load lifting and falling speed can be kept constant, which is easy to operate; when the working valve is in the 2 position, the confluence valve 15 and 16 are pushed to the left end of the pump C The oil enters the pressure oil circuit of pumps A and B, that is, the pressure oil of the three pumps is all supplied to the walking motor, so that the excavator has a faster walking speed.
In order to prevent the occurrence of suction of oil pumps A and B, the system is equipped with a charge pump with a larger displacement 3 independent cooling system 5 is fully cooled by two dedicated oil pumps to circulate the oil, and the speed limit valve 18 is Used to limit the continuous degree of excavator driving downhill to prevent slipping.
