KR920007602B1 - Metal melting and retaining furnace - Google Patents

Abstract

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Description

Metal melting

1 is a cross-sectional view of a dissolution holding path of aluminum showing an embodiment of the present invention.

2 is a longitudinal cross-sectional view thereof.

* Explanation of symbols for main parts of the drawings

20: melting tower chamber 21: material inlet

22: exhaust hole 30: loss of inclination

33, 33A, 33B: inclined top surface 39: melting burner

40: holding room 41: partition wall

42: communication opening 49: holding burner

50: dispatch room 51: partition

52: communication port 55: gas treatment unit

A: Aluminum Material

The present invention relates to a metal melting holding furnace such as aluminum, and more particularly to a continuous melting holding furnace used as an auxiliary furnace.

Conventionally, as the molten metal supply system of the auxiliary furnace, there are a system in which a metal material is continuously dissolved directly using a crucible furnace, and a system in which molten metal dissolved in the concentrated melting furnace is transported by ladles or the like in an auxiliary furnace dedicated to a fat furnace.

However, in the case of using the former crucible furnace, since the ingot, which is a cold material, is directly charged into the crucible furnace and continuously melted, a melt temperature for positive and negative temperatures of 20 to 30 ° C. is generated at the molten metal temperature. There is a big problem. In addition, if the input of the material is reduced to reduce the temperature fluctuations, there is a problem that the dissolution efficiency and thermal efficiency worsens, and the maintenance cost, which is not small inherently, becomes larger. On the other hand, in the latter concentrated dissolution method, since it is limited to having a large number of casting machines and requiring a large amount of dissolution, there is a situation in which casting of aluminum and the like which are produced in small quantities is rarely used. In addition, even in this concentrated melting method, since the melt temperature naturally decreases during the water bathing process, the tapping temperature in the concentrated melting furnace must be increased by the lowered amount, thereby leaving energy saving problems and melt management problems.

The present invention has been proposed in view of such a situation, and is a compact furnace capable of continuous dissolution as an auxiliary furnace, and can easily and reliably manage the temperature of the molten metal, thereby improving the quality of the molten metal and further improving thermal efficiency. It is an object of the present invention to provide a new secondary continuous melting furnace which can increase the melting capacity and improve the melting capacity.

That is, in the metal melting and holding | maintenance which concerns on this invention, the dissolution tower comprised so that the material located in the lower part of the metal material hit by tower shape melt | dissolves and the material located in the upper part may be preheated by the combustion exhaust gas in a furnace. An inclined chamber having an inclined top surface in which a chamber, a dissolving burner is disposed toward the dissolving tower chamber, and the molten metal material is heated and flows down; It is provided with a communication opening through which the metallic material can be introduced, and the bottom surface is lower than the inclined top surface, and the holding chamber is provided with a holding burner for insulating the molten metal in the room, and is adjacent to the holding chamber and the partition wall therebetween. And a communication port provided at a position lower than an upper surface in a normal state of the molten metal accumulated in the holding chamber. In the vicinity tonggu it relates to a metal melt held as one wherein geupchul chamber formed with a gas processing unit for extracting the inert gas into the molten metal.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings, in which FIG. 1 is a cross sectional view showing an embodiment of the present invention for dissolving aluminum, and FIG. 2 is a longitudinal sectional view thereof.

The metal melting holding | maintenance of this invention has the structure of the furnace body 10 as shown in the cross-sectional view of FIG. In other words, the furnace body 10 is made of solid refractory material, so that the melting tower chamber 20 for preheating and dissolving the material, the inclined chamber 30 for dissolving while the molten metal material is preheated, and the molten metal are melted. It consists of the holding chamber 40 and each part of the feeding chamber 50 supplied with the high quality molten metal from the holding chamber.

The melting tower chamber 20 is a space into which aluminum materials (A) such as aluminum ingots, which are dissolving materials, are placed and placed, and are formed in a tower shape or a cylindrical shape so that the metal material is hit in a tower shape. In the upper part of the melting tower chamber 20, as shown in FIG. 2, a material inlet 21 and an exhaust hole 22 are provided.

In the embodiment, the exhaust hole 22 is formed in the lid 23 of the material inlet 21. Reference numeral 24 denotes a cover for adjusting the exhaust hole, and 25 denotes an inspection and work tool. In the melting tower chamber 20, the material A1 located in the lower part of the aluminum material A hit in a tower shape is transferred to the heating gas (including the burner frame) of the melting burner 39 described below. The material A2, which is dissolved in the upper portion, is preheated by the combustion exhaust gas in the furnace including the exhaust gas of the melting burner.

The melting tower chamber 20 is open at least in front of the inclined upper chamber 30 so that the molten metal material (including the fluid semi-employed state) flows out into the inclined upper chamber 30.

The melting burner 39 is disposed on the side wall surface 31 of the inclined upper chamber 30 toward the lower portion of the melting tower chamber 20. Moreover, the inclined upper chamber 30 has the inclined upper surface 33 in which the aluminum material melt | dissolved in the said melting tower chamber 20 flows down into the holding chamber 40 mentioned below. In the embodiment, the inclined top surface 33 is the first inclined surface 33A which inclines directly to the front surface of the melting tower chamber and two inclined surfaces, such as a second inclined surface that is bent at a right angle to the left as shown in FIG. 1 from the first inclined surface. It is.

In this way, bending the inclined surface at right angles not only makes the furnace structure compact and improves the zero efficiency of the melting burner 39, but also if the material A in the melting tower chamber 20 rolls on the inclined surface. In order to prevent it from falling easily into the holding chamber described next.

The aluminum material dissolved in the melting tower chamber 20 is heated and heated by the melting burner 39 while flowing down the inclined upper surfaces 33A and 33B of the inclined upper chamber 30 to obtain a high quality molten metal. Flows into the holding chamber 40.

34 is an inspection and work tool.

The holding chamber 40 is a place where the molten metal M is accumulated and kept warm. That is, the holding chamber 40 is not only adjacent to the inclined chamber 30 and the partition 41 but also in which the molten metal material flowing down the inclined chamber 30 can flow into the holding chamber 40. It has a communication opening 42.

In addition, the bottom surface 43 of the holding chamber 40 is configured to be lower than the inclined upper surface 33. Preferably, the bottom surface 43 is formed through the step 44 as in the embodiment of FIG. This is because the accumulated molten metal M flows into the inclined plane surface 33 and contacts with the molten metal material having a low temperature of the inclined plane surface 33 or in some cases, the cold material before melting that has collapsed from the inclined plane surface 33. This is to prevent the hot water from dropping or generating gas.

Moreover, the holding burner 49 which heat-insulates the indoor molten metal M is provided in this holding chamber 40. The holding burner 49 is preferably as shown in FIG. 1 so that the flame heats the molten upper surface and the exhaust gas flows into the melting tower chamber 20 through the communication opening 42. The holding chamber inner wall 43 of the opposite axis of the communication opening 42 is formed in a curved surface, and is disposed with a predetermined angle of inclination toward the inner wall 43. This is due to the effective use of energy.

Reference numeral 45 in FIG. 1 denotes an inspection and work tool.

The feeding chamber 50 is a portion to which a high quality molten metal for casting M is supplied, and the upper part is normally opened for feeding operation. Reference numeral 53 denoted by an imaginary line in FIG. 2 is a top cover.

This dispensing chamber 50 not only adjoins the holding chamber 40 and the partition walls 51 therebetween, but also has a communication port 52 in the lower portion of the partition walls 51. The communication port 52 is provided at a position lower than the upper surface S in the normal state of the molten metal M accumulated in the holding chamber. This is to prevent impurities such as oxides floating on the surface of the molten metal from flowing into the feeding chamber 50.

In this manner, the heating gas of the holding burner 49 can be prevented from being blown out from the holding chamber 40 to the outside, and the noise inside the furnace by the burner sound can be blocked.

In the vicinity of the communication port 52 of the dispensing chamber 50, a gas treatment unit 55 is provided for discharging gas frequently contained in the molten metal, for example, hydrogen gas in the aluminum molten metal, from the molten metal.

The gas processing unit 55 is arranged in the porous tube 56 at the bottom of the discharge chamber 54 near the communication port 52 as in the illustrated embodiment, and inert gas such as nitrogen in the porous tube 56 is provided. The gas or argon gas is taken out into the molten metal and icebergs from the surface of the molten water to the outside together with the gas present in the molten metal.

In order to effectively perform this gas dissipation, it is preferable to arrange | position the blocking plate 57 in the back of the porous pipe 56, and to discharge gas bubble by the porous pipe 56 densely and screen-likely. Reference numeral 58 is a gas cylinder of inert snow gas, and 59 is a conduit.

Next, the case where the aluminum material is actually dissolved and retained using the metal melting holding furnace of the present invention will be described. First, the melting burner 39 and the holding burner 49 in the furnace are ignited to dissolve the tower. 20, the inclined upper chamber 30 and the holding chamber 40 are heated and heated up.

The heating gas of the melting burner 39 rises upward from the lower part of the melting tower chamber 20 with the exhaust hole 22. The heating gas of one holding burner 49 circulates inside the holding chamber 40 and enters the inclined chamber 30 from the communication opening 42 of the holding chamber 40 at the lower portion of the melting tower chamber 20. It leads to the upper side of the melting tower chamber 20 in which the exhaust hole 22 is located.

Here, the inlet 21 of the upper portion of the melting tower chamber 20 is opened, and the aluminum material A such as an aluminum ingot is introduced so that the melting tower chamber 20 is almost full. The material A1 located in the lower part of the aluminum material A hit on the melting tower chamber 20 is heated and dissolved by the heating gas of the melting burner 39.

At the same time, the material A2 located on the upper side is in contact with the exhaust gas of the melting burner 39 and the exhaust gas of the holding burner 49 to be heated and preheated. The thermal energy of the burner in the furnace can be effectively utilized in this way.

The material dissolved in the melting tower chamber 20 is discharged from the bottom surface 28 of the tower chamber 20 to the inclined upper surface 33 of the inclined upper chamber 30.

The melted material flowing out of the inclined chamber 30 is further heated and heated while maintaining the inclined surface 33 by the burner frame of the melting burner 39 and the heating gas of the holding burner 49.

Then, a sufficiently heated and completely dissolved material flows into the holding chamber 40 via the communication opening 42 and accumulates as molten metal.

In the holding chamber 40, the temperature of the molten metal is controlled by the holding burner 49. As described above, the feeding chamber 50 freely communicated by the holding chamber 40 and the communication port 52 below the partition 51 is free of impurities such as oxides floating on the molten metal surface. The molten metal of extremely high quality from which hydrogen gas etc. were removed is supplied, and it is supplied to a mold as needed.

As shown and described above, according to the present invention, it is first possible to provide an extremely useful thing as an auxiliary furnace which can be used for casting by dissolving and holding a metal material as necessary. Further, since the metal material dissolved in the melting tower chamber is further heated and heated in the inclined phase chamber and introduced into the holding chamber, the temperature change of the molten metal in the holding chamber due to the inflow of the dissolved metal material can be reduced.

This is extremely advantageous in solving the problem of lowering the dissolving ability due to the lowering of the melt temperature of the molten metal and greatly increasing the dissolving ability of the furnace.

In addition, in this dissolution holding path, the temperature control of the molten metal can be reliably performed in the holding chamber from the above, and the molten metal supplied from the dispensing chamber can be reliably used in the same manner as in the conventional melt surface. It is possible to obtain an extremely high quality product which is free of any impurities and further removed hydrogen gas by the gas treatment unit.

In addition, the device of the present invention can effectively utilize energy, which enables high thermal efficiency and significant fuel cost savings.

Claims (1)

Among the metal materials hit in the shape of a tower, the material located in the lower part is dissolved and the material located in the upper part is configured to be preheated by the combustion exhaust gas in the furnace, and a melting burner is disposed toward the melting tower chamber. It has an inclined upper surface which flows down while the metal material is heated, and has an inclined upper chamber and a communication opening through which the inclined upper chamber and the partition wall are adjacent, and the molten metal material which inflows down the inclined upper surface can flow in, The bottom surface is lower than the inclined top surface and is adjacent to the holding chamber provided with a holding burner for keeping the indoor molten metal and the holding chamber and the partition wall therebetween, and the upper surface in the normal state of the molten metal accumulated in the holding chamber. In the metal melting holding passage consisting of a dispensing chamber having a communication port provided in a lower position, the dispensing chamber is a top A metal melting fat furnace comprising a gas treatment section for extracting an inert gas into a molten metal near a gas communication port.

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