METHOD FOR CONTROLLING FEEDING RATE OF POWDER

摘要

PURPOSE:To automatically maintain the thickness of the powder on a molten steel always constant by measuring the thickness of the powder on the surface of the molten steel in a mold of a continuous casting device with an optical displacement sensor and controlling the feeding rate of the powder according to the measured value thereof. CONSTITUTION:The molten steel 2 is poured from a tundish car 5 by an immersion nozzle 4 into the mold 1 of the continuous casting device and the powder 3 for lubrication between the mold 1 and a steel input is supplied by a supply pipe 15 onto the molten steel. The surface level of the molten steel and the level of the powder 3 thereon are measured with the optical displacement sensor 10 and are inputted to a calculator 11, by which the thickness of the powder 3 is calculated. The difference between the calculated value and the set value of the powder thickness is inputted to a control command device 12. A drive unit 13 automatically controls the rotating speeds of feeding motors 16, 17 of a powder feeder 14 according to the output thereof to automatically maintain the thickness of the powder 3 on the molten steel 2 always at the specified value.