Hydraulic shear run disconnection device null for continuous casting machine

摘要

PURPOSE:To prevent excess drawing of a cast billet with a hydraulic shear and to execute stable shearing by synchronizing hydraulic shearing velocity so as to become the equal velocity with cast billet drawing velocity at the time of shearing and increasing the traveling velocity after shearing. CONSTITUTION:When shearing command of the cast billet is outputted, velocity detect signal in pinch rolls is transmitted to the casting velocity detector 15, and the prescribed input voltage works a solenoid in a proportion electromagnetic type flow rate control valve 16 with an amplifier 21 to control pressure oil flow rate into a cylinder 13 for hydraulic running. The hydraulic shear is run in the cast billet drawing direction at the velocity synchronized with the drawing velocity of the pinch rolls by the cylinder 13 and also an upper edge in the shear is descended to shear the cast billet. Just after shearing, the input voltage of the amplifier 21 working the proportion electromagnetic type flow rate control valve 16 becomes high, and by increasing a control flow rate in the proportion electromagnetic type flow rate control valve 16, the shear running velocity is increased and the hydraulic cylinder 13 for shear running is run at high velocity while ascending-returning the upper edge in the shear, and the hydraulic shear 10 is worked to advance by the prescribed stroke at high velocity and retreat to the original position and waiting for the next shearing.