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US 3,941,281 AGranted
Control device for regulating teeming rate
AssigneeUnited States Steel Corporation
InventorRobert Duncan Hind
Life of this patent
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Abstract
Teeming of molten metal from a laden vessel into a receiving vessel such as an ingot mould or tundish is accomplished at a controlled rate by detecting the changing weight of one of the vessels and deriving a valve control signal by comparing a changing weight signal with a presettable reference signal, the valve control signal being employed to adjust the setting of a sliding gate valve through which molten metal passes as it is teemed into the receiving vessel.
Claims10
Apparatus for admitting molten metal into a receiver vessel, said apparatus comprising:
- a charging vessel which has a discharge orifice and includes a sliding gate valve for controlling flow of molten metal through said orifice to said receiver vessel;
- means for actuating said valve to achieve a controlled flow rate therethrough and being reliant solely on a monitoring of the overall weight of one of said vessels, said means including:
- a load sensor on said one of said vessels, the weight of which is monitored;
- a differentiating circuit connected with said sensor for differentiating a load sensor output signal with respect to time;
- a presettable reference signal generator;
- a difference amplifier having inputs connected both to said differentiating circuit and to said reference signal generator to receive output signals from each;
- said difference amplifier being operative to derive an error output signal from the input signals thereto from said differentiating circuit and said reference signal generator;
- and
- a valve actuator connected to said difference amplifier to which said valve actuator said error output signal is fed for controlling the setting of said valve.
6 more elements
Dependencies are inferred from the claim text.