RU188786U1 - ELECTRIC MELT-RESISTANCE FURNACE - Google Patents

Abstract

The proposed solution relates to the field of foundry, in particular, to electric melting furnaces for melting metals and their alloys. The technical result of the proposed technical solution is to create a design of an electric melting resistance furnace, for melting metals and their alloys, ensuring the removal of slags and impurities of heavy metals directly during smelting, which allows to reduce the time of obtaining the melt and reduce its cost. Electric resistance melting furnace, This turns the housing with heaters and lining, a removable cover, crucible support for the crucible, the thermocouple. At the same time, in the bottom of the case there are two nozzles for discharge of molten metal, one of which is located below the other, the walls of the crucible are made perforated.

Description

The invention relates to the field of metallurgy, in particular, to electric furnaces for melting metals and alloys.

Electric resistance furnaces are known, in which a metal crucible is placed inside a lined chamber (case), on the walls of which electric heaters are located. The disadvantage of these furnaces is the inability to conduct smelting in a protective gas environment, and the need to equip them with furnace tilting mechanisms to drain metal from the crucible.

These disadvantages are deprived of the furnace, which have a hermetic cover that covers the furnace body after the loading of metal ingots and the siphon to release the metal [1, 2].

Closest to the proposed model is an electric crucible resistance furnace for low-melting metals, including a housing with heaters, a lining, a removable lid, a crucible, a crucible support and a thermocouple [3] prototype.

The disadvantage of this furnace is the need, after receiving the melt, to remove the resulting slags and impurities of heavy metals, which leads to an increase in the melting time and increase the cost of the process.

The technical result of the proposed technical solution is the creation of the design of an electric melting furnace of resistance for melting metals and their alloys, ensuring the removal of slags and impurities of heavy metals directly during melting, which reduces the time to obtain the melt and reduce its cost.

The technical result is achieved due to the fact that an electric melting resistance furnace is offered, which includes a housing with electric heaters, a lining, a removable lid and exhaust pipes located in the lower part of the housing bottom, a crucible, a crucible support and a thermocouple, while the crucible walls are perforated and in the bottom of the case there are two pipes for the release of molten metal, with one pipe located below the other,

In the process of melting the melt through the perforated walls of the crucible is poured inside the furnace body, while the solid impurities floating on the surface of the melt remain inside the crucible, as their size exceeds the sizes of the holes of the perforated walls. Impurities of heavy metals are deposited at the bottom of the furnace body. After the end of the smelting process, the electric heaters are turned off, and the melt is drained through the upper outlet.

The remains of the melt contaminated with impurities of heavy metals, merge through the exhaust pipe located at the bottom of the bottom of the case.

FIG. 1 shows the design of an electric resistance melting furnace.

An electric resistance melting furnace consists of a housing 1 with electric heaters 2, lining 3, a removable airtight cover 4, exhaust pipes 5 and 6, a perforated crucible 7 mounted on support 8, thermocouples 9. Heaters and lining of the furnace are installed on the outside of the case; between the inner wall of the furnace body and the outer wall of the crucible.

When melting, the metal ingots to be melted are loaded into the crucible 7, which is placed inside the furnace body 1 on the stand 8 and closed with an airtight lid 4. After switching on the electric heaters 2, the melting process begins. As the ingots melt, the liquid metal through the perforated walls of the crucible 7 is poured inside the housing 1.

After the melting is completed, the liquid metal from the furnace body 1 is discharged through the outlet nozzle 5. The remains of the metal with impurities of heavy metals that remain at the bottom of the body merge through the outlet nozzle 6.

At the Kurchatov Institute Research Center - Central Research Institute of Prometey CM, tests were carried out on the proposed design of the smelting furnace, which showed that using it shortens the melt production time and, consequently, increases the productivity of the smelting process.

Information sources:

1. Copyright certificate for invention number 146041 (priority of 03/21/1961).

2. RF patent 2061941 (priority of February 12, 1993).

3. V.I. Velsky, B.V. Sergeev. Industrial furnaces and pipes. §32 Electric Melting Furnaces M. Stroyizdat.1974 - prototype.

Claims (1)

An electric resistance melting furnace for melting metals, comprising a housing with electric heaters and lining, a crucible with a removable lid, mounted on a support in a housing having a bottom, and a thermocouple, characterized in that the crucible is made with perforated walls, the openings of which are smaller than the dimensions of solid impurities, and the bottom of the case is made with upper and lower parts, in the first of which there is an outlet for the discharge of liquid metal, and in the second for the outlet of the residual metal with solid impurities.

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