JPS6257917B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a quantitative supply device for molten metal.

In devices such as continuous steelmaking furnaces that continuously supply molten metal and perform a scouring reaction in the furnace, the conditions for the scouring reaction, that is, the temperature, composition, and supply amount of the molten metal, must be kept as constant as possible. Maintaining this is very important for stable smelting operations. In particular, there is no good means to continuously measure the amount of molten metal supplied, and therefore it is impossible to control it, so it is necessary to provide a quantitative supply device from the beginning. Generally, molten metal is in a very high temperature state, which makes it structurally very difficult to construct a metering supply device. Conventionally, an intermediate container (tundish) with a nozzle for tapping the metal at the bottom has been used, or two intermediate containers have been used. A device for supplying a fixed amount by tilting alternately has been used. However, while these quantitative feeding devices are suitable for transferring molten metal from a container such as a ladle, when feeding molten metal directly from a fixed melting furnace, the location of the melting furnace is It has the drawback of being very expensive, very dangerous in terms of arrangement, and uneconomical.

The present invention has been proposed for the purpose of providing a fixed quantity supply device that improves the above-mentioned drawbacks when molten metal is continuously supplied to a continuous steel making furnace or the like that is directly connected to a melting furnace. The molten metal quantitative supply device uses two intermediate vessels (tundishes) that supply a fixed amount of molten metal by tilting at a constant speed, and alternately receives the molten metal from the melting furnace and supplies it to the continuous steelmaking furnace. The tundish is installed repeatedly on an elevating frame composed of parallelogram links, and the molten metal is received from the melting furnace at the lower limit position. Molten metal is poured into the steelmaking furnace at its upper limit position, making it possible to install the melting furnace as low as possible, making it suitable for continuous steelmaking equipment and other devices that quantitatively and continuously supply molten metal. It is extremely effective when applied.

The structure and operation of continuous steel manufacturing equipment to which the present invention is applied will be explained below with reference to FIG. In FIG. 1, a continuous steelmaking furnace 2 is a trough-shaped container lined with a refractory material and has a molten metal inlet 3 and a steel tapping port 4 at both ends thereof, and a supply port 5 for a slag forming agent 23 in the ceiling. It is a closed furnace equipped with an oxygen lance 6 and an exhaust port 7. On the side of the inlet port 3, there is provided a quantitative supply device for continuously supplying the molten metal 19 in a constant quantity. The raw material molten metal (for example, 2 to 3% C hot metal) 16 melted in the melting furnace 1 is heated by tilting the furnace, etc.
The hot water is tapped 17 to a quantitative supply device and continuously supplied 19 to the continuous steelmaking furnace 2 . This raw molten metal is smelted and decarburized into molten steel with a carbon content of 0.1 to 0.3% while being blown with oxygen 22 from an oxygen lance 6 and simultaneously supplied with a slag forming agent 23 from a supply port 5 in a continuous steelmaking furnace 2. The steel is continuously tapped from the tap port 4. Since a large amount of exhaust gas (CO gas) 21 is generated during this scouring reaction, it is exhausted 21' from the exhaust port 7 through an exhaust gas duct 8. When performing such a scouring reaction continuously, it is important to maintain the conditions of the raw molten metal (i.e., molten metal composition, temperature, supply amount, etc.) as constant as possible to ensure a stable scouring reaction, that is, under constant conditions. This is important for producing molten steel. The present invention has devised an apparatus for maintaining a constant and continuous supply of raw material molten metal within these conditions.

The molten raw material quantitative supply device according to the present invention includes two sets of quantitative supply tundages 9, 9' that are tiltably supported by tilting cylinders 12, 12', and each tundish 9, 9' is independently supported. It consists of support frames 10, 10' that can be raised and lowered and connected by parallel links 11, 11' mechanism, and each set of quantitative supply tundishes 9, 9' alternately receives and releases hot water. This makes it possible to continuously supply a fixed amount of raw material molten metal. The structure and operation of this quantitative supply device will be explained in more detail with reference to FIG. As shown in the figure, the two sets of metered supply tundishes 9, 9' are intermediate containers lined with fireproof material, and are operated by tilting hydraulic cylinders 12, 12' about fulcrums 14, 14', respectively. By tilting the tundish at a constant speed, the molten metal (hot metal) 18 in the tundish is supplied to the smelting furnace 2 at a constant flow rate (supply amount) 19. It has a cross-sectional shape that allows for Further, scales 15 and 15' are provided for measuring the amount of molten metal in the tundish. The support frames 10, 10' are connected to parallel link mechanisms 11, 11', and are capable of being raised and lowered by lifting hydraulic cylinders 13, 13'. These two sets of metering supply devices, one set is at receiving position B, the tundish 9' receives molten metal 17, and when a predetermined amount is reached, the scale
The receiving of hot water is stopped by the signal 5', and at the same time, the hydraulic pressure 25 acts on the lifting cylinder 13', and the tundish 9' rises 28 together with the support frame 10'.
On the other hand, the other set of tundishes 9 is already in the fixed quantity supply position A, and the hydraulic pressure 24 is applied to the tilting cylinder 12.
acts to tilt 26 at a constant speed, supplying 19 the molten metal 18 in the tundish 9 at a constant flow rate. When the fixed quantity supply is finished, the tandate 9
returns to its original position 27, and at the same time hydraulic pressure 25 acts on the lifting cylinder 13, causing the tundish 2
9 is lowered 29 together with the support frame 10 and returns to the original hot water receiving position B. In this way, the two sets of quantitative supply devices repeatedly move alternately between the receiving position B and the quantitative supply position A, thereby continuously supplying the molten metal in a constant quantity. In addition to the parallel link 11, 11' mechanism, it is also possible to employ a link mechanism that can vertically move up and down as the elevating mechanism for the support frames 10, 10'.

Since the device of the present invention has the above-described configuration and function, according to the present invention, (1) it is possible to continuously supply a fixed amount of molten metal using two sets of tundishes; becomes.

(2) Since the tundish is set on a support frame that can be raised and lowered,
(Head H) It becomes possible to receive the melt, and the installation position of the melting furnace 1 can be lowered.

(3) In a completely continuous process, from a continuous melting furnace to a continuous steelmaking furnace, it is possible to keep the molten metal supply level almost constant, and it is possible to consider a less dangerous and practical layout in terms of the overall layout.

(4) It can be applied as a continuous quantitative supply device for molten metal in continuous metal smelting processes other than continuous steel manufacturing.

The following practical effects can be mentioned.

[Brief explanation of the drawing]

The attached drawings are schematic illustrations of one embodiment of the present invention.
FIG. 1 is a longitudinal side view of the entire structure including a melting furnace and a continuous steelmaking furnace, and FIG. 2 is a longitudinal side view of the main parts. 1: Melting furnace, 2: Continuous steelmaking furnace, 9, 9': Intermediate container (tundish), 10, 10': Elevating frame, 11, 11': Parallel link mechanism, 12, 1
2': Hydraulic cylinder for tilting, 13, 13': Hydraulic cylinder for lifting, 14, 14' fulcrum, 15, 15':
Weighing device.

Claims (1)

[Claims] 1. Two sets of elevating frames are arranged in parallel on a foundation between the melting furnace and the continuous smelting furnace, etc., so as to be raised and lowered separately via elevating mechanisms each operated by a drive source, and each of these elevating frames is provided with a tilting means. Two sets of intermediate containers (tundishi) supported in a tiltable manner by a weighing device are installed in each of the intermediate containers, and are equipped with a weighing device that sends a signal to each drive source of each of the above-mentioned elevating frames and activates the drive sources. A continuous quantitative supply device for molten metal.