WATER HAMMERING PREVENTING TYPE HYDRAULIC SYSTEM FOR METAL PACKING DRY CAKE FILTER

摘要

PURPOSE:To eliminate the generation of shock wave due to the water hammering generated in a hydraulic system of high pressure by opening and closing a solenoid valve before starting the operation of pump so as not to match the timing, and adjusting the opening and closing of a pilot valve by using a damper. CONSTITUTION:When the solenoid valve 2 is changed over to the upward movement side by the input of upward movement stroke of cylinder, the timing is delayed at which a motor 11 and a hydraulic pump 5 are started to be revolved. And, when the cylinder is sufficiently moved upward, the signal to cut the input to the pump 5 is sent to stop the pump 5, and the solenoid valve 2 is closed after the pump 5 is stopped. When the solenoid valve 1 is moved to the downward movement side by the input signal of the start of downward movement of cylinder, the timing to send the input signal to start driving the pump 5 is delayed, and the pump 5 is cut after a hydraulic switch 6 for the oil pressure in the cylinder is given with a specified pressure, and moreover, the solenoid valve 1 is cut with a delay after the pump 5 is stopped. And, the opening and closing of the pilot check valve 17 is adjusted by using the damper 16.