JPS6049846A - Device for supplying powder in continuous casting plant - Google Patents

Abstract

PURPOSE:To enable automatic formation of a uniform powder layer over the entire surface of a molten steel by providing two units of detectors for thickness of the powder layer and powder sprayers on both sides of an immersion nozzle so that the detection of thickness without contact is not hindered by the immersion nozzle. CONSTITUTION:An immersion nozzle 4 is disposed in roughly the central part of a casting mold 5 and a molten steel 1 is poured through the inside of said nozzle 4 into the mold 5. A pair of IR cameras 10 which scan the surface of the steel 1 are provided above the mold 1 and the temp. and temp. distribution of the powder surface are measured by said cameras without contact. The temp. detection signals thereof are inputted to a device 11 for processing IR signals where the thickness of the powder layer and the distribution thereof are detected. The output signal from the device 11 is inputted to a control device 9. The device 9 controls the rate of supplying the powder by a pump 6 for supplying the powder and the operation of the nozzle of a robot 8 for supplying the powder, thereby maintaining the specified thickness of the powder layer.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a powder supply device for continuous casting equipment, and particularly to a powder supply device for automatically and uniformly supplying powder to the surface of molten steel in a mold with a constant layer thickness in a large continuous slab caster.

Generally, in large-scale continuous casting equipment, a method is used in which molten steel is injected into the mold through a long submerged nozzle in order to prevent air oxidation of the molten steel injected from the tundish.At the same time, synthetic slag called powder is injected into the molten steel in the mold. It is sprayed on the surface of the hot water to avoid contact with the air. The purpose of powder is
Mainly, the surface of the molten steel is coated with powder to prevent oxidation of the molten steel, and the molten powder flows into the mold to provide lubrication between the mold wall surface and the molten steel. Conventionally, this kind of powder supply has been done manually by workers, but since the powder gradually melts depending on the temperature of the molten steel, workers have to feed it one after another, It was a lot of work. To compensate for this, there are devices that automatically supply powder at fixed intervals using a timer, etc., but the supply amount is uneven, and there are cases where the mold is buried in powder or the surface of the molten steel is partially exposed at all times. Therefore, worker supervision is still necessary. In recent years, the use of TTI type, electromagnetic type, and other mold level meters has been used to save labor and automate the work of giving up work, but the number of workers at the foundry is still limited to the above-mentioned powder supply work. The current situation is that it is not decreasing.

The object of the present invention is to provide a continuous casting machine that performs fully automatic feeding while controlling the powder layer thickness on the molten steel surface to be uniform and constant over the entire surface of the molten steel, thereby saving labor in the casting shop. Our goal is to provide a powder supply device for the world.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic perspective view of a powder supply device according to an embodiment of the present invention. Immersion nozzle 4 is located almost in the center of mold 5.
is arranged, and the molten steel 1 is injected into the hook 5 through the nozzle 4. Two powder supply robots 8 are installed near the top of the mold on both sides of the immersion nozzle 4, and these robots reciprocate the two movable powder scattering nozzles 12 over the molten steel surface in the mold in the vertical and horizontal directions, front and back, left and right, and up and down directions. It is supposed to move. 6 is a powder supply bong connected to each movable nozzle 12 through a hose 13f, and 7 is a powder storage juxtaposition. These nozzle supply robots 8, movable nozzles 12. and powder supply pump 6
This constitutes the powder supply movable nozzle device of the present invention. Note that 2 is one layer of molten powder, 3 is one layer of powdered powder, and 3' is powder sprayed from the nozzle 12.

A pair of infrared cameras 10 are installed above the mold to scan the molten steel surface, and these infrared cameras measure the temperature of the powder surface and its temperature distribution in a non-contact manner. The temperature of the powder surface and its distribution are related to the thickness of the powder layer 2 and 3 and its distribution, and the higher the temperature of the powder surface, the more
One layer of powder is thin. 2N is a diagram showing the temperature distribution on the surface of one layer of powder, and as it goes from A to E, the layer of powder becomes thicker, and the surface temperature of the powder surface due to heat transfer from the molten steel becomes lower. The temperature detection signal from the infrared camera 10 is input to an infrared signal processing device 11, where the thickness of one layer of powder and its distribution are determined from the temperature and distribution state of the powder surface. The output signal of the infrared signal processing device 11 is input to the control device 9, which controls the control device so that the thickness of each powder layer is constant - and the thickness distribution is uniform over the entire surface of the molten steel. The supply amount of the powder supply pump 6 and the nozzle operation (nozzle position) of the powder supply robot 8 are controlled.

According to the present invention, since the powder single layer thickness detection device and the powder dispersion device are coated with two gold films on both sides of the immersion nozzle, non-contact thickness detection is not obstructed by the immersion nozzle, and it is possible to detect the entire surface of the molten steel. It is possible to completely automatically form a single layer of uniform powder, which saves the labor of workers at the casting plant.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view of a powder providing apparatus according to an embodiment of the present invention, and FIG. 2 is a diagram showing the temperature distribution on the surface of the powder layer on the molten steel surface. DESCRIPTION OF SYMBOLS 1... Molten steel, 2.3... Powder, 5... Mold, 6... Powder supply pump, 8... Powder supply robot, 9... Control device, 10... Infrared camera, 11...
・Infrared signal processing device, 12...Movable nozzle. A1 Agent Patent Attorney Rikichi Somekawa

Claims (1)

[Claims] a movable nozzle device that supplies powder to the molten steel surface in the mold; a detection device that detects the thickness of the powder layer and its thickness distribution from the surface temperature and temperature distribution of the powder layer sprinkled on the molten steel surface; Powder supply for continuous casting equipment, characterized in that it has a control device that controls the operation of the movable nozzle device and the powder supply amount so that the thickness of one layer of the powder becomes uniform and constant according to the output signal of the detection device. Device.