KR100903376B1 - Melting furnace assembly comprising discharging cylinder - Google Patents

Abstract

The present invention is a melting furnace containing a metal melted and surrounded by a refractory; A cover covering the melting furnace; A discharge cylinder is inserted into the melting furnace through the cover to discharge the molten metal dissolved in the melting furnace to the outside, a gas inlet through which gas is introduced is formed in the upper portion and an inlet for inflow of molten metal in the lower portion is formed. The main valve extends in the longitudinal direction from the inner center through the upper portion and includes a main valve having a circular valve plate at the lower end and a discharge pipe disposed at the side of the main valve to discharge molten metal, and the main valve is raised. The molten metal is introduced through the inlet in the state, and the gas flows through the gas inlet in a state where the main valve descends to close the inlet so that the molten metal inside the discharge cylinder is discharged through the outlet pipe by the pressure of the gas. It is discharged to, the exhaust cylinder; includes. According to this configuration, the molten metal can be discharged quickly and safely through the discharge cylinder.

Melting Furnace, Cover, Refractory, Exhaust Cylinder

Description

Melting furnace assembly including discharge cylinder {MELTING FURNACE ASSEMBLY COMPRISING DISCHARGING CYLINDER}

The present invention relates to a melting furnace, and more particularly to a melting furnace assembly that can easily discharge the molten metal in the melting furnace.

Melting furnaces for heating and melting metallic materials above the melting point are classified into various types, such as electric furnaces, reflecting furnaces, crucible furnaces, and the like, depending on the type of the apparatus for heating the melting furnace.

This melting furnace requires a lot of energy to heat the solid material, and also shows a lot of differences in energy efficiency according to the type of heating device, recently, the energy efficiency is excellent and the automation and The use of low frequency and high frequency induction melting furnaces, which have good effects such as productivity improvement, is increasing.

Conventional melting furnaces have a problem that the operation is difficult and therefore time-consuming in connection with the operation of pumping molten metal, that is, tapping.

As one of the most commonly used methods, the cover is opened directly to disperse the molten metal solution in the furnace, but accessibility is limited due to the high heat of the furnace. Therefore, only a small amount can be sent out, and the work takes a lot of time. In addition, the operation of hot molten metal is exposed to danger.

In addition, there is a problem that oxygen is introduced when the furnace is open. When oxygen is introduced, oxygen and molten metal in the air cause an oxidation reaction, and impurities are generated or ignited.

The present invention is designed to overcome the problems of the prior art described above.

An object of the present invention is to make it possible to easily extract molten metal and to discharge molten metal quickly while reducing the risk.

Furthermore, an object is to prevent oxygen from flowing even when the melting furnace is opened, thereby preventing the generation of impurities by the reaction with oxygen or preventing the problem of ignition.

In addition, other objects and advantages of the present invention can be understood from the following description with reference to the accompanying drawings.

In order to achieve the above object, the present invention provides a melting furnace containing a metal melted and surrounded by a refractory; A cover covering the melting furnace; A discharge cylinder is inserted into the melting furnace through the cover to discharge the molten metal dissolved in the melting furnace to the outside, a gas inlet through which gas is introduced is formed in the upper portion and an inlet for inflow of molten metal in the lower portion is formed. The main valve extends in the longitudinal direction from the inner center through the upper portion and includes a main valve having a circular valve plate at the lower end and a discharge pipe disposed at the side of the main valve to discharge the molten metal, and the main valve is raised. In the molten metal is introduced through the inlet, the gas flows through the gas inlet while the main valve is lowered to close the inlet, the molten metal inside the discharge cylinder by the pressure of the gas to the outside through the discharge pipe A discharge cylinder, which is discharged. According to this configuration, the molten metal can be discharged quickly and safely through the discharge cylinder.

More preferably, the discharge cylinder further includes an auxiliary valve rod on the side of the main valve, the cylinder lower portion further includes an auxiliary outlet on the inlet side, and the auxiliary valve rod discharges molten metal through the discharge pipe. The secondary outlet can be blocked while being raised upward to discharge the remaining molten metal remaining at the bottom after all the molten metal in the discharge cylinder has been discharged. Thus, by easily discharging the molten metal remaining in the discharge cylinder through the auxiliary discharge port, it is possible to prevent the remaining molten metal from solidifying in the discharge cylinder.

More preferably, the lower portion of the discharge cylinder is provided with a plurality of guides having a pin-shaped at a predetermined interval around the inlet, a plurality of slits are formed around the circumference of the circular valve plate of the main valve, The guide part is inserted into the slit so that the main valve is guided when the main valve moves up and down so that the main valve can close the inlet accurately. Therefore, it is possible to prevent the main valve from flowing in the molten metal to open and close the inlet accurately.

More preferably, the cover has a double structure of an upper layer and a lower layer, wherein the upper layer is formed with one or more retractable auxiliary covers through which the discharge cylinder can be inserted, and the upper layer can be opened and closed with respect to the lower layer. Through this double structure cover, both metal input into the furnace and insertion of the discharge cylinder can be realized.

More preferably, a plurality of gas nozzles are arranged surrounding the opening of the lower layer to prevent oxygen in the atmosphere from flowing into the furnace when the upper layer is opened with respect to the lower layer, and by the gas injected from the nozzle. Ingress of oxygen is blocked. The inflow of oxygen can be effectively blocked by forming a film of gas ejected by such a gas nozzle.

According to the present invention, the molten metal can be easily extracted and the molten metal can be discharged quickly and safely. In addition, when the melting furnace is opened, it is possible to block the inflow of oxygen to prevent the problem that impurities are generated or ignited by oxidation.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing the overall configuration of the furnace assembly according to the present invention.

Melting furnaces used in the present invention may include all types of melting furnaces such as electric furnaces, reflecting furnaces, crucible furnaces and the like. Preferably an electric furnace can be used.

The melting furnace assembly of the present invention includes a melting furnace 100 having an open top, a lid 200 covering the same, and a discharge cylinder 300 inserted into the melting furnace to discharge the molten metal. The heating wire 110 is disposed around the melting furnace 100 to heat the melting furnace, and the heating wire 110 and the melting furnace are surrounded by the refractory 120. The molten metal melted in the melt is finally poured into the casting stage 400.

By opening the lid 200 of the melting furnace, metal raw materials, for example, aluminum, magnesium, and the like, may be introduced into the melting furnace. When the metal raw material is introduced into the melting furnace as necessary, the lid 200 is closed and the melting furnace is heated to dissolve the metal. When the molten metal is formed in the melting furnace, the discharge cylinder 300 may be inserted into the melting furnace through the cover 200 to discharge the molten metal to the outside.

Hereinafter, the structure of the discharge cylinder 300 will be described first in detail to describe the discharge process of the molten metal.

2 to 4 specifically show the structure of the discharge cylinder 300 of the present invention. 2 is a side cross-sectional view of the discharge cylinder 300, FIG. 3 is a plan view of the discharge cylinder viewed from above, and FIG. 4 is a bottom view thereof.

The discharge cylinder 300 is a cylinder having a cylindrical shape, and has an inlet 311 formed therein for introducing molten metal into the lower center thereof. The discharge cylinder may be separated from the upper and lower parts for cleaning and maintenance of the inside, and the lower side may be covered with the fire resistant layer 350 to withstand heat in the furnace. Legs are formed at the bottom of the discharge cylinder to support the bottom of the furnace. In addition, as shown in FIG. 3, the outlets 303 and the holes 304 and 305 may pass through the outlet 303 so that the outlet pipe 320 described later may be inserted into the upper portion of the discharge cylinder 300, and the main valve and the auxiliary valve rod described later. Is formed. Furthermore, the sight hole 309 may be formed to look inside the discharge cylinder, and a pressure gauge 308 for measuring the pressure inside the discharge cylinder may be further formed.

In the center of the discharge cylinder 300 is provided a main valve 330 that can move up and down. The main valve 330 includes a rod part 331 penetrating the upper portion of the discharge cylinder and extending over the entire length direction of the discharge cylinder, and a circular valve plate 332 blocking the inlet 311 at the bottom thereof. When the discharge cylinder is inserted into the melting furnace after the metal is melted in the melting furnace, the molten metal in the melting furnace flows into the discharge cylinder 300 while pushing up the main valve 330 disposed in the center of the discharge cylinder. Alternatively, when the discharge cylinder is inserted into the melting furnace, the main valve 330 may be raised to allow molten metal to flow into the furnace.

The elevated main valve 330 is brought down again by its own weight or by force. The lowered main valve 330 closes the inlet 311. This is achieved by the circular valve plate 332 provided at the lowermost end of the rod 331 of the main valve 330 again coupled to the inlet 311.

After the molten metal is filled in the discharge cylinder, gas is introduced through the gas inlet 306 formed thereon. When the gas is introduced, pressure is applied to the molten metal filled in the cylinder while the gas descends in the direction of the arrow (see FIG. 1). When the molten metal is pressurized, the molten metal is raised through the discharge pipe 320 installed in the discharge cylinder 300 and discharged to the outside.

After the molten metal in the discharge cylinder is exhausted, the gas in the discharge cylinder is extracted again and vacuumed. The gas may be drawn out through the gas inlet 306, or alternatively, may be formed through a separate gas outlet 307. When the main valve is raised again in a vacuum state, the inlet port 311 is opened so that molten metal in the melting furnace is introduced into the discharge cylinder again, and the molten metal discharge process is repeated. The act of raising the main valve 330 may be performed by the pressure difference between the molten metal in the melting furnace and the discharge cylinder in the state in which the gas inside the discharge cylinder is empty. Alternatively, the main valve 330 may be raised by applying a force from outside.

Preferably, the discharge cylinder 300 may further include an auxiliary outlet 313 on the side of the inlet 311 of the lower surface of the cylinder. On the side of the main valve 330, the auxiliary valve rod 340 is inserted into the auxiliary outlet port 313 formed at the bottom of the discharge cylinder while extending longitudinally in the discharge cylinder through the top of the discharge cylinder.

After the molten metal is exhausted from the discharge cylinder 300, the remaining molten metal accumulated at the bottom of the discharge cylinder may be discharged downward by raising the auxiliary valve rod 340 to open the auxiliary discharge port 313. Therefore, the molten metal remaining in the discharge cylinder can be prevented from hardening by completely removing the molten metal remaining in the discharge cylinder after all the operations for discharging the molten metal in the melting furnace are completed.

Meanwhile, as illustrated in FIG. 2, a plurality of pin-shaped guide parts 315 are disposed around the molten metal inlet 311 at the lower portion of the discharge cylinder at predetermined intervals, and as shown in FIG. In the circular valve plate 332, slits 333 are formed at predetermined intervals along the circumference near the circumference. Since the guide part 315 is inserted into the slit 333, the guide part 315 can move only in the slit 333 when the main valve 330 is raised and lowered, so that the guide part 315 can rise and fall stably and accurately. Inlet 311 can be blocked.

6 shows a plan view of a lid covering the furnace 100.

The cover is preferably a dual structure of the upper layer 210 and the lower layer 220. The upper layer 210 may be open with respect to the lower layer 220. Separating the upper layer from the lower layer can be made easier by using a lever 240 installed between the upper and lower layers of the cover, as shown in FIG. That is, the upper layer of the cover may be opened while the lower layer 220 of the cover is fixed to the upper portion of the melting furnace 100, and the metal raw material is introduced into the melting furnace when the upper layer 210 of the cover is opened.

In addition, the top layer 210 includes a circular auxiliary cover. This auxiliary cover is preferably composed of two auxiliary covers 211 and 212. The auxiliary cover is for inserting the discharge cylinder 300 into the melting furnace, it is possible to install the discharge cylinder in the melting furnace after opening the auxiliary cover.

When the furnace cover 200 is opened, the metal inside the furnace comes into contact with oxygen in the atmosphere. Oxidation problems arise when metals in the furnace come into contact with oxygen. In addition, for example, a metal such as magnesium has a problem that ignition occurs when it is combined with oxygen at 600 ° C or higher. Therefore, there is a need to prevent contact with oxygen when the cover 200 is opened. To this end, a plurality of gas injection nozzles 230 are installed in the cover 200 as shown in FIG. 6. This gas injection nozzle is preferably arranged parallel to the cross section of the lid and surrounding the opening of the lower layer 220. The gas injected by the gas injection nozzle is preferably CO ₂ , and this gas is injected from a plurality of gas injection nozzles to form a kind of barrier such as an air curtain, so that oxygen in the air can be prevented from entering the furnace. .

Although the above has been illustrated and described with respect to preferred embodiments of the present invention, the present invention is not limited to the above-described embodiments, and the general knowledge in the field of the present invention without departing from the gist of the present invention as claimed in the following claims. Anyone having a variety of modifications can be made, of course, such modifications are included within the scope of the claims.

1 is a side view showing the overall configuration of the furnace assembly according to the present invention.

FIG. 2 is a side view of the discharge cylinder of FIG. 1. FIG.

3 is a plan view of the discharge cylinder of FIG.

4 is a bottom view of the discharge cylinder of FIG. 2.

FIG. 5 is a plan view of a valve plate under the main valve installed in the discharge cylinder of FIG. 2; FIG.

6 is a cross-sectional view of the lid of the melting furnace of FIG. 1.

[Description of Major Symbols in Drawing]

100: melting furnace

120: refractory

200: cover

230: nozzle

300: discharge cylinder

320: discharge pipe

330: main valve

340: auxiliary valve rod

Claims (5)

A melting furnace 100 in which metal is melted and surrounded by a refractory material; A cover 200 covering the melting furnace; As a discharge cylinder 300 is inserted into the melting furnace 100 through the cover 200 to discharge the molten metal dissolved in the melting furnace to the outside, a gas inlet 306 is formed therein is introduced into the upper Inlet 311 is formed in the lower portion for the inflow of molten metal, and extends in the longitudinal direction from the inner center through the upper portion of the main valve 330 and the main valve having a circular valve plate 332 at the bottom The discharge pipe 320 is disposed on the side of the 330 to discharge the molten metal, the molten metal is introduced through the inlet 311 in the state in which the main valve 330 is raised, the main valve 330 ) Is lowered and the gas flows through the gas inlet 306 while the inlet 311 is closed, so that the molten metal inside the discharge cylinder is discharged to the outside through the discharge pipe 320 by the pressure of the gas. , The discharge cylinder 300; melting furnace assembly comprising at. The method of claim 1, The discharge cylinder 300 further includes an auxiliary valve rod 340 on the side of the main valve 330, and the lower part of the cylinder further includes an auxiliary outlet 313 on the side of the inlet 311, and the auxiliary valve rod. 340 blocks the auxiliary outlet 313 while discharging the molten metal through the discharge pipe 320 and then moves up to discharge the remaining molten metal remaining in the lower part after all of the molten metal in the discharge cylinder is discharged. Melting furnace assembly, characterized in that. The method according to claim 1 or 2, The lower portion of the discharge cylinder 300 is provided with a plurality of pin-shaped guide portion 315 at predetermined intervals around the inlet 311, around the circumference of the circular valve plate 332 of the main valve 330 A plurality of slits 333 are formed along the circumference, and guided when the main valve 330 moves up and down to guide the main valve 330 to close the inlet 311 accurately. Furnace assembly, characterized in that is inserted into the slit (333). The method according to claim 1 or 2, The cover 200 has a dual structure of an upper layer 210 and a lower layer 220, and the upper layer 210 has one or more retractable auxiliary covers 211 and 212 into which the discharge cylinder 300 can be inserted. The melting furnace assembly, characterized in that the upper layer 210 can be opened and closed with respect to the lower layer (220). The method of claim 4, wherein When the upper layer 210 is opened with respect to the lower layer 220, a plurality of gas nozzles are disposed surrounding the opening of the lower layer 220 to prevent oxygen from being introduced into the melting furnace. Furnace assembly, characterized in that the oxygen is blocked by the gas injected from the.

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