A study on properties of oil hydraulic multiple function cylinder

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Recently, the oil hydraulic controlled system has been applied to the field of mining industry, civil engineering and construction industly. The robotized mechines have been required to improve labor-saving, safety and production in mining and construction works.The aim of this study is to design the oil hydraulic multiple function cylinder which corresponds to a part of the robotized machines.A vibration technique s employed to the oil hydraulic cylinder, which has multiple function. An apparatus of the experiment is an oil hydraulic controlled system with the two single-rod cylinders, proportional solenoid valve and high speed on-off solenoid valve.First, the system is identified by mean of an expanded least square method. Next, the experiment is made with variation of the supply pressure and the frequency and the bias voltage under some levels of the constant load. As a results, the quantitative fundamental properties, namely, the vibration amplitude, the feed speed, the frequency, the maximum pushing force and the acceleration, were obtained.Furtheremore, to investigate cutting effect of the oil hydraulic multiple function cylinder, the experimental model of the system was assumed as an actual hydraulic excavator, and the quantitative properties of the multiple function cylinder with vibration were compared with these of no-vibration cylinder. It was obtained that the effect of the oil hydraulic multiple function cylinder corresponds to the quantitative properties of the excavator.Final, the experiments of the oil hydraulic shovel with the oil hydraulic multiple function cylinder were carried out on the actual field. It was confirmed that oil hydraulic multiple function cylinder has the effective cutting force which corresponds to the shovel with a operator.