JPS6183872A - Continuous melter for metal - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a continuous melting apparatus for a low melting point metal such as aluminum, and particularly to an apparatus having a forehearth having a separate structure from a melting furnace.

[Process until the invention was completed]

A conventional continuous melting apparatus of this type includes a straight cylindrical melting furnace and a forehearth having a temperature-raising burner, and the bottom of the melting furnace and the forehearth are communicated by a molten metal outflow pipe. The forehearth was provided with an exhaust hole. The exhaust gas from the burner in the forehearth was directly released into the atmosphere through this exhaust hole.

By the way, since the exhaust gas in such a forehearth has a high temperature, a loss occurs as thermal energy, and therefore, the inventor thought to effectively utilize this exhaust gas in raising the temperature of the molten metal.

[Purpose of the invention]

This invention was made based on this situation,
The purpose is to provide a continuous metal melting apparatus that improves the heating efficiency of the melting furnace and heats the molten metal flowing through the flow pipe connecting the melting furnace and the forehearth.

[Structure of the invention]

The purpose is to provide a continuous metal melting apparatus that includes a melting furnace and a forehearth having a burner, and in which the bottom of the melting furnace and the forehearth are communicated with each other by an outflow pipe. This was achieved by not providing

[Explanation of Examples]

Hereinafter, the present invention will be described in detail based on the drawings.

In FIG. 1, 11 is a melting furnace, which is installed on the ground G via a support stand 13. This melting furnace 11 is provided with a melting chamber 11a having an enlarged diameter at the lower part, a preheating chamber 11b having a reduced diameter and serving as an exhaust pipe at the upper part, and has an opening 15 above the preheating chamber 11b. This opening 15 is a place where the material to be melted A is introduced into the melting furnace II, and is normally covered by a furnace lid 17. 19 is a discharge port, which is connected to the furnace cover 1 of the melting furnace 11.
7 is drilled. This discharge port 19 is for exhausting the combustion gas in the melting furnace II. Further, 21 is a burner, which is installed in the upper wall of the melting chamber 11a toward the furnace bottom wall 24 on the side of the outlet hole 25a bored at the lower part. This burner 21 melts the material to be melted A in the melting chamber 11a, and in turn heats the material to be melted A in the preheating chamber 11b. The combustion gas that has risen to the highest point is then discharged from the exhaust port 19.

Next, 23 is a fore-furnace for storing molten metal, and the melting furnace 11
It is installed at 1iG near the ground. This front furnace 2
3 and the bottom of the melting furnace 11 are communicated through an outflow pipe 25. Therefore, the molten metal produced in the melting furnace 11 flows into the forehearth 23 via the outflow pipe 25.

Further, a thermometer 30 and a scene detection sensor 31 are arranged at the upper part of the forehearth 23, and the burner 21 is connected to the burner 21 so that it can be ignited and extinguished. Note that the upper wall 41 of the outflow pipe 25 can be separated,
It can be opened and closed by moving up and down (in the direction of the arrow) using the hanging tool 26, which facilitates maintenance.

Reference numeral 27 denotes a temperature increasing burner, which is installed at the upper part of the side wall connected to the outflow pipe 25 of the forehearth 23. The temperature raising burner 27 heats and keeps the molten metal stored in the forehearth 23 warm. Further, since the forehearth 23 does not have an exhaust hole communicating with the atmosphere, the high temperature combustion gas from the burner 27 flows into the melting furnace 11 through the outflow pipe 25 while convecting inside the furnace.

Note that 29 is a tap hole drilled in the lower part of the forehearth 23.

〔Effect of the invention〕

The continuous metal melting apparatus according to the present invention includes a melting furnace and a forehearth having a burner, and the bottom of the melting furnace and the forehearth are communicated through an outflow pipe. The forehearth is not equipped with exhaust means.

For this reason, the combustion gas from the burner in the forehearth heats the molten metal, convects inside the furnace, passes through the outflow pipe, flows into the melting furnace, and heats the melting furnace and the material to be melted. Combined with this, the heating efficiency is further increased.

As a result, since the combustion gas passes through the outflow pipe, it is possible to heat the molten metal gradually flowing in and effectively raise the temperature.

Further, if the molten metal level detection sensor and the melting burner are connected and operated as in this embodiment, a substantially constant amount of molten metal can be obtained at all times.

Furthermore, if the outflow pipe can be opened and closed, maintenance such as removal of slag and repairs can be easily performed.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of a continuous metal melting apparatus according to the present invention. 11...Melting furnace 23...Forehearth 25...Outflow pipe 27...Temperature-raising burner patent Applicant: Asahi Malleable Iron Co., Ltd. Patent attorney Yuji Nosue>! ,−・〉、′・

Claims (1)

[Claims] (1) A continuous metal melting apparatus comprising a melting furnace and a forehearth having a burner, and in which the bottom of the melting furnace and the forehearth are communicated through an outflow pipe, and the forehearth is provided with an exhaust means. A continuous metal melting device characterized in that: