JPH0212558Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an arc furnace for melting and refining scrap, reduced iron, etc.

[Prior Art] The auxiliary tapping chamber of a conventional arc furnace having an auxiliary chamber for tapping has an integral structure with the furnace main body, and has an open top surface. Also, the outlet was blocked with a stopper rod.

[Problems to be solved by the invention] Therefore, since the connection between the furnace body and the auxiliary chamber for tapping is a large opening, there is a lot of heat loss, and the molten metal and slag splash is blown away by the arc and cannot be used for tapping. There is a concern that it may easily fly into the auxiliary room and stick in the auxiliary room for hot water dispensing, causing problems in hot water dispensing. Furthermore, since the tap hole is blocked by a stopper rod, there is a problem in terms of service life due to wear and tear of the stopper rod, or in ensuring that the tap is clogged. The disadvantages are that the flow is easily oxidized and easily entrains slag. In addition, since the auxiliary tapping chamber is integrated with the furnace main body, it is not possible to remove and replace the auxiliary tapping chamber, so the arc furnace operation stoppage is required to repair the refractory lining of the auxiliary tapping chamber. This requires a long period of time, resulting in a decrease in the operation rate of the arc furnace and poor productivity.

[Means for Solving the Problems] In an arc furnace equipped with an auxiliary chamber for tapping on the side wall of the furnace body, a gate that can be opened and closed is provided between the auxiliary chamber for tapping and the side wall of the furnace body. Further, the auxiliary chamber for tapping the hot water is detachably attached to the side wall of the furnace main body, and the top opening of the auxiliary chamber for tapping the hot water is provided with a lid that can be opened and closed. Although this lid is not necessarily required due to the presence of the gate, it is preferable to include it in terms of keeping the molten metal warm and preventing oxidation during tapping.

[Function] By providing the gate, the thermal efficiency of the arc furnace is improved and splashes of molten metal and slag do not fly into the auxiliary chamber and become stuck. Further, if the gate is pulled up to a position where slag and the like floating in the upper layer are not allowed to flow out, and the arc furnace main body is tilted by a conventionally known means to tap the metal, only the molten metal can be reliably tapped. Furthermore, since there is a gate on the side wall of the furnace body, there is no need to close the tap, and by closing the gate, you can safely and reliably replace the auxiliary chamber for tapping or repair the tap. can.

[Examples] Examples of the present invention will be described below with reference to the drawings.

The figure shows an embodiment of the present invention, in which an auxiliary chamber 4 for tapping is removably attached to the side wall 2 of the arc furnace main body 1 using a tightening device 3 such as a bolt or a bolt. A tap hole 5 is bored in the lower surface near the tip. Also, on the side wall portion 2 of the furnace body 1,
A gate 6 that can be opened and closed vertically is provided at a location closer to the furnace body than the mounting surface 11 of the auxiliary tapping chamber 4. Furthermore, the upper surface opening 1 of the auxiliary room for hot water tapping
2 is provided with a lid 7 that can be opened and closed. In addition, 8 in the figure
is an electrode, 9 is an arc, and 10 is a hearth line.

With the above structure, when the gate 6 is raised upward to such an extent that the slag floating in the upper layer of the molten metal does not flow out, and the furnace body 1 is tilted by a conventionally known means to tap the molten metal, only the molten metal can be reliably tapped. can. Further, since the auxiliary chamber 4 for tapping can be attached and detached by the fastener 3 outside the gate 6, it can be easily replaced even during operation of the arc furnace.

It should be noted that the arc furnace of the present invention is not limited to the above-mentioned embodiments, and it is of course possible to make various changes without departing from the gist of the present invention, such as further providing a lid, a valve, etc. to the tap outlet. be.

[Effects of the invention] As described above, since a gate that can be opened and closed vertically is provided between the side wall of the furnace body and the auxiliary chamber for tapping, the invention provides various excellent effects as described below. .

() The provision of a gate improves the thermal efficiency of the arc furnace.

() It is possible to prevent splashes of molten metal and slag from flying into the auxiliary chamber for tapping and becoming stuck.

() Since there is no disturbance in the flow of the tapped metal, entrainment of slag and impurities can be prevented.

() It is possible to reliably discharge only molten metal without accompanying slag, improving quality.

() Maintenance is easy as there is no need to particularly block the outlet.

() If the auxiliary tapping chamber is removably attached to the side wall of the furnace main body, and the top opening of the auxiliary tapping chamber is provided with a lid that can be opened and closed, the oxidation of the molten metal flow will be prevented, safety will improve, and the operation of the arc furnace will be improved. rate will improve.

() It is possible to safely repair the hot water tap or replace the hot water tap auxiliary room while the arc furnace is in operation.

[Brief explanation of the drawing]

The drawing is an explanatory diagram of one embodiment of the arc furnace of the present invention. Reference numeral 1 indicates an arc furnace main body, 3 a fastener, 4 an auxiliary chamber for tapping, 5 a tap opening, 6 a gate, and 7 a lid that can be opened and closed.

Claims (1)

[Scope of utility model registration request] 1. An arc furnace comprising an auxiliary chamber for tapping on a side wall of a furnace body, characterized in that a gate that can be opened and closed is provided between the auxiliary chamber for tapping and the side wall of the furnace body.