JPH0331993B2 - - Google Patents

Description

holding chamber 40 provided with a container 49; A metal melting and holding furnace characterized by having:

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a metal melting furnace for melting metal materials such as aluminum or for maintaining the molten metal in a molten state.

(Prior art) For example, in Japanese Utility Model Publication No. 57-2877, a cylindrical melting chamber, a heating chamber, and a holding chamber are divided through a partition wall,
A metal melting furnace is disclosed in which burners are arranged in each of the heating chamber and the holding chamber. According to this prior art, when the metal material to be melted is introduced from the melting chamber, the metal comes into contact with the molten metal and the temperature of the molten metal in the warming chamber is rapidly lowered, but in this invention, the heating chamber and the holding chamber are Since the holding chamber is divided by a partition wall, the molten metal inside the holding chamber is not affected by the holding chamber, and there is almost no temperature drop, so it is said that continuous tapping is possible. Furthermore, the cylindrical melting chamber has the advantage that all the combustion gases rise therein, allowing sufficient preheating of the metal material.

However, the above prior art has a fatal problem in temperature control of the molten metal because the metal material to be melted comes into direct contact with the molten metal. Of course, in order to solve this problem, in the prior art, a warming chamber was provided and separated from the holding chamber, but if the metal material does not come into direct contact with the molten metal, there is no need to provide this means. Moreover, without such temperature loss, the melting burner can be used only for melting the metal material, improving its thermal efficiency and saving energy.

(Problems to be Solved by the Invention) However, the present invention attempts to propose a new type of melting furnace in which the low-temperature metal material does not come into direct contact with the molten metal during melting.
In addition, this invention allows melting work to be carried out more efficiently at an appropriate high temperature in the melting chamber,
Another object of the present invention is to provide a metal melting and holding furnace that can keep the stored molten metal at a preferable temperature in the holding chamber.

(Means for Solving the Problem) That is, in the present invention, among the metal materials stacked in a tower shape, the material located at the lower part is heated, and the material located at the upper part is preheated by the combustion exhaust gas in the furnace. a melting chamber having a cylindrical preheating chamber, a melting chamber in which a melting burner is disposed toward the preheating chamber, and a sloped floor surface through which the heated metal material flows down while being heated and melted; A holder having a communication opening through which molten metal material flowing down an adjacent sloping floor can flow in, the bottom surface being lower than the sloping floor, and a holding burner for keeping the molten metal in the chamber warm. The present invention relates to a metal melting and holding furnace characterized by having a chamber.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall cross-sectional view of a metal, especially aluminum, melting and holding furnace showing one embodiment of the present invention, and FIG.
FIG. 3 is a sectional view taken along line 2--2 in the figure, FIG. 3 is a sectional view taken along line 3--3 in FIG. 1, and FIG. 4 is a sectional view taken along line 4--4 in FIG.

The melting and holding furnace shown in Fig. 1 is an example of an aluminum melting and holding furnace that can also be used as a molten metal replenishment system for a hand-held furnace for molten aluminum, and its furnace body 10 is constructed of strong refractory material. As is well known, the furnace consists of a furnace wall made of steel, a heat insulating material that covers the outside of the furnace wall to prevent heat diffusion, and furnace materials such as iron plates that reinforce the furnace shell.

The furnace body 10 according to this embodiment is divided into a preheating chamber 20, a melting chamber 30, a holding chamber 40, and a pumping chamber 50. The code 21 in FIG. 1 is the preheating chamber 2.
0 and the holding chamber 40, and 51 is a partition wall separating the holding chamber 40 and the pumping chamber 50.

In addition, in the embodiment, a pumping chamber 5 for pumping out the molten metal
0 is provided independently, however, the molten metal may be pumped out by an appropriate pumping means, as can be seen in already known furnaces.

Each part of the embodiment will be explained below.

As can be understood from FIG. 1 and FIG. 4, which is a cross-sectional view taken along the line 4-4, the preheating chamber 20 is located at the lower part of the metal material A to be melted which is charged and stacked in this chamber. The material A2 located at the top where the material A1 is heated is constructed in a cylindrical shape so as to be preheated by the combustion exhaust gas in the furnace. It is formed. It is preferable to make the height of the preheating chamber 20 as high as possible while considering workability in terms of heat exchange efficiency.

Reference numeral 23 denotes a plate-shaped input port cover for opening and closing the material input port 22, and is movable in the horizontal direction. An exhaust port 24 is formed in the input port cover 23.

Note that the floor surface 20a of the preheating chamber 20 is formed higher than the inclined floor surface 33 of the melting chamber 30, which will be described below.

As can be understood from FIGS. 1, 2 to 4, the melting chamber 30 is provided adjacent to the preheating chamber 20, and the melting burner 39 is oriented horizontally toward the preheating chamber 20. It is arranged on the wall surface 31.

As shown in FIG. 2 or FIG. 4, the molten metal material Am of the material A1 located at the lower part of the preheating chamber 20 does not remain in the preheating chamber 20 and is transferred to the holding chamber 40 described below. It has a sloped floor surface 33 which flows downward while being heated toward the communication opening 42 of the pipe.

The melting burner 39 provided in the melting chamber 30 is
Material A placed in the preheating chamber 20 as shown in FIG.
The burner is disposed horizontally toward the lower part of the preheating chamber 20 so that the axis 39a of the burner is substantially horizontal so that the burner can be directly heated. Also, burner 39
It is desirable for the burner axis 39a to be located within a range of about 100 to 200 mm from the inclined floor surface 33 in terms of thermal efficiency.

Next, as is clear from FIG. 2, the holding chamber 40 has a communication opening 42 adjacent to the melting chamber 30 and into which the molten metal material Am flowing down the inclined floor surface 33 can flow; The bottom surface 43 of the room is configured to be lower than the inclined floor surface 33. In addition,
In FIG. 2, an example is shown in which the bottom surface 43 of the holding chamber is formed by an inclined surface that is lowered toward the pumping chamber 50 side through the inclined floor surface 33 and the stepped portion 44.

A holding burner 49 is installed in the holding chamber 40 to keep the molten metal in the room warm. This holding burner 49
This prevents the upper surface of the molten metal M stored in the holding chamber 40 from cooling down. As shown in FIG. 3, the axis 49a of this burner is arranged substantially horizontally so as to be almost parallel to the surface of the molten metal M, and the distance from the surface of the molten metal M to the burner axis 49a is It is preferable that the distance is approximately 150 to 300 mm. The direction of the burner 49 is such that the long frame of the burner extends along the surface of the molten metal M in the holding chamber 40 and the inner surface of the holding chamber 40, as shown by the arrow 49b in FIG. 42 and flows toward the dissolution chamber 30 side.

In addition, in order to keep the temperature of the molten metal M in the holding chamber 40 constant, the holding burner 49 is operated by a signal from a thermometer (not shown), which is a thermocouple provided in the pumping chamber 50, which will be described below. Ignition and extinguishing are automatic.

The pumping chamber 50 is adjacent to the holding chamber 40 with a partition wall 51 in between. The partition wall 51 is provided with a communication port 52 located below the upper surface of the molten metal M stored in the holding chamber 40 in its normal state. This is to prevent impurities such as metal oxides, so-called grime, generated on the upper surface of the molten metal M in the holding chamber 50 from flowing out, and to supply only clean molten metal to the pumping chamber 50.

The pumping chamber 50 is open at the top as a pumping outlet 53, and is covered with a lid 54 if necessary.

Reference numerals 25, 35, and 45 in Fig. 1 are inspection openings provided in the side walls of the preheating chamber 20, melting chamber 30, and holding chamber 40, respectively, and are sufficient for inspection, monitoring, cleaning, etc. of each chamber. They are each closed by doors 26, 36, 46 which can be opened and closed.

(Function) Next, the function of the metal melting furnace of the present invention will be explained with respect to the aluminum melting and holding furnace of the above-mentioned embodiment.

First, the melting burner 39 and the holding burner 49 are ignited to heat and keep the melting chamber 30 and the holding chamber 40 warm. Next, aluminum material (cold material) A is introduced into the preheating chamber 20 from the material input port 22 until it is almost full, and the lid 23 is closed.

The heating gas from the melting burner 39 directly heats the material A1 in the lower part of the preheating chamber 20, and also rises within this preheating chamber 20 to preheat the material A2 located in the upper part.

The material A1 introduced into the lower part of the preheating chamber 20 is heated by the melting burner 39 (burner frame).
The aluminum Am in a molten or semi-solid solution state flows out onto the inclined floor surface 33 of the melting chamber 30. And this inclined floor surface 3
The molten material Am flowing into the melting burner 39
It is further heated and heated, flows down the floor surface 33, becomes completely molten, and flows into the holding chamber 40 through the communication port 42.

The molten aluminum that has flowed into the holding chamber 40 is stored as molten metal M. In the holding chamber 40, the holding burner 4
9 is installed to maintain the temperature of the molten metal constant as described above. The heated gas from the holding burner 49 circulates through the holding chamber 40 and then is guided into the preheating chamber 20 via the melting chamber 30, so that it heats the molten material Am in the melting chamber 30 and melts the unmelted material in the preheating chamber 20. Preheat A.

The molten metal M stored in the holding chamber 40 is connected to the communication port 52.
It flows into the pumping chamber 50 through the pumping chamber 50, and is pumped out from the pumping outlet 53 as needed.

Note that since the surface of the molten metal M stored in the holding chamber 30 normally blocks the communication port 52, the holding chamber 40
The heated gas from the holding burner 49 inside can be prevented from blowing out into the pumping chamber 50, and the operator can perform pumping work without being affected by exhaust gas. Further, as described above, impurities on the surface of the molten metal M can be prevented from flowing into the pumping chamber 50.

(Effects) As illustrated and explained above, according to the present invention, it was possible to provide a new type of melting and holding furnace in which low-temperature materials do not come into direct contact with molten metal when melting metal materials. Further, the present invention provides a metal melting and holding furnace that can perform timely and high-temperature melting work more efficiently in the melting chamber, and can also keep the stored molten metal at a preferred temperature in the holding chamber. I was able to do that.
As described above, according to the present invention, it is possible to provide a metal melting and holding furnace that can improve temperature loss, greatly improve thermal efficiency, save energy as a furnace, and greatly contribute to improving the quality of molten metal. It is something that

[Brief explanation of the drawing]

FIG. 1 is an overall cross-sectional view of a metal, especially aluminum, melting and holding furnace showing one embodiment of the present invention, and FIG.
FIG. 3 is a sectional view taken along line 2--2 in the figure, FIG. 3 is a sectional view taken along line 3--3 in FIG. 1, and FIG. 4 is a sectional view taken along line 4--4 in FIG. 10...furnace body, 20...preheating chamber, 30...melting chamber, 33...slanted floor surface, 39...melting burner,
40... Holding chamber, 42... Communication opening, 43... Bottom surface, 49... Holding burner, 50... Pumping chamber, 5
1... Partition wall, 52... Communication port, A... Aluminum material, M... Molten metal.

Claims (1)

[Scope of Claims] 1. A metal material stacked in a tower shape, the material located at the lower part being heated and the material located at the upper part being preheated by the combustion exhaust gas in the furnace. a preheating chamber 20; a melting chamber 30 having a sloped floor surface 33 in which a melting burner 39 is disposed facing the preheating chamber and through which the heated metal material flows down while being heated and melted; a sloped floor adjacent to the melting chamber; Communication opening 42 through which molten metal material flowing down the surface can flow.
The bottom surface 43 is configured to be lower than the sloping floor surface, and has a holding bar that keeps the molten metal in the room warm.