Hot water surface control unit null of compressed note hot water

摘要

PURPOSE:To stably maintain molten metal surface level in a pouring hole and further, to enable control under few frequency of opening/closing a valve for air supply as less as possible by parallel arranging a leakage compensating piping providing an electrically operated type flow rate control valve to an air supply control piping. CONSTITUTION:At first, in order to start the pouring, by closing a solenoid valve 21 in exhaust control piping 14, and opening a solenoid valve 16 in the air supply control piping 12, a solenoid valve 18 in the leakage compensating piping 13 and the electrically operated type flow rate control valve 19, pressure in a pressurizing chamber 4 is raised and the molten metal surfaces in the pouring hole 2 and molten metal receiving hole 3 are raised, and at the time of being brought into contact with a detecting element 6 of molten metal surface level for controlling air supply, the signal is received to close the solenoid valve 16 in the air supply control piping 12. Successively, by opening/closing a stopper 8 in a constant quantitative shotting device 10, the molten metal is poured in each one shot. By this method, to the leakage quantity changing in accordance with variation of the molten metal surface level in the pressurizing chamber 4 during shotting, as the leakage compensating control is executed by intermittently operating an electric motor in the electrically operated type flow rate control valve 19 to adjust the opening/closing velocity of the valve, the molten metal surface level in the pouring hole 2 is maintained to almost constant and the opening/ closing motion in the solenoid valve 16 can be executed at the necessary min. limit of the frequency.