JPS6310357B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a melting furnace in which a heating chamber is connected to a forehearth into which scrap of recycled non-ferrous metals such as aluminum, zinc, lead, etc. is to be fed, through a partition wall. This relates to a melting furnace in which a fore-furnace is used as a melting chamber, and melting is promoted by circulating the molten metal between both chambers using a pump.

Conventionally, a heating chamber and a holding chamber are connected to each other via a partition wall having a communication passage, a cylindrical melting chamber is connected to the warming chamber at the bottom and has a melting material inlet at the top, and The greenhouse and the holding chamber are equipped with a first burner and a second burner, respectively. A melting furnace is known from Japanese Utility Model Publication No. 57-2877.

However, in the above-mentioned melting furnace, when a light and thin material to be melted, such as an empty aluminum beverage can or foil, is charged from the inlet, the material to be melted is directly exposed to the flame or combustion gas of a combustion burner, etc. When touched, it oxidizes or burns to become oxides, and these oxides float on the surface of the molten metal, making it impossible to recover the aluminum content, resulting in poor yields, lower melting efficiency, and lower furnace operating efficiency. There are drawbacks such as.

In contrast, the present invention aims to provide a melting furnace capable of eliminating the above-mentioned drawbacks, and its gist is to heat a molten metal by having a pair of combustion burners in a substantially rectangular furnace shell. A heating chamber, a pump chamber with a metal circulation pump, and a melting chamber for the input material to be melted are installed in a square arrangement, and these chambers are communicated with each other through a metal passage, and the heating heating chamber and the melting chamber are separated by a partition wall. The flame of a combustion burner, etc. and high-temperature combustion gas are prevented from directly contacting the melted material by separating the melted material into heat transfer due to the circulating contact of the molten metal brought about by the pump operation. In a type of melting furnace that melts at elevated temperature, a lid having an exhaust port is attached to each of the melting chamber and the pump chamber, and in this case, the lid to be attached to the melting chamber contains the material to be melted. The structure consists in that a weight part is integrally formed to constantly press downward to promote dissolution.

Another gist of the invention is that in a melting furnace of the type described above, a lid having an exhaust port is attached to each of the melting chamber and the pump chamber, and in this case, a weight is placed above the melting chamber. The present invention resides in that the weight is movable up and down, and when a shelf hanging phenomenon occurs, the weight is lowered to apply an impact to the material to be melted in the melting chamber.

Next, the present invention will be explained in more detail with reference to FIGS. 1 to 3.

In FIGS. 1, 2, and 3 showing the melting furnace according to the present invention, A is a heating chamber greenhouse for materials to be melted such as aluminum, zinc, lead, etc., B is a pump room, C is a melting chamber, D, E and F indicate the first, second and third metal passages, and G indicates the furnace shell, and the molten metal passes through the first, second and third metal passages D, E and F in each of the chambers. In this case, the melting chamber C serves as a forehearth in a well-known melting furnace of this type, and the melting chamber C serves as a forehearth in a well-known melting furnace of this type. The greenhouse A and the pump chamber B or the melting chamber C into which the material to be melted is charged are separated by a partition wall H, so that the flame of a combustion burner or high temperature combustion gas does not come into direct contact with the material to be melted. The material to be melted in the melting chamber is configured to be melted by circulating the melt using a pump or the like.

On the other hand, as shown in FIG.
The bottom of the melting furnace main body 1, which consists of a heating heating chamber A and a melting chamber C, which are in communication with each other via a partition wall H, is placed on a base 2 and surrounded by pillar members 3, A metal circulation pump 4 that transports molten metal quickly and safely like water is installed in a pump room B that communicates with the heating chamber A and the melting chamber C via the first metal passage D and the second metal passage E, respectively. Yes (see Figure 2), in this case, the suitable metal circulation pump is the one described on pages 23-24 of the October 1983 issue of "Al-Aru", published by Light Metal Tsushin Aru Co., Ltd. The pump mainly consists of an air motor, a shaft, an impeller, a riser, etc. (all not shown), and the impeller, which has several to hundreds of holes opened in the direction of rotation, is moved as appropriate by the drive of the air motor. By rotating it within the base, thrust is applied to the fluid by the action of centrifugal force, thereby heating the heating chamber A.
The molten metal inside is sucked from the first metal passage D, and is transferred from the pump spout 5 to the second metal passage E to the melting chamber C.
It is sent to.

In addition, a pair of combustion burners 6 are provided in the longitudinal direction of the heating heating chamber A, and a chimney 9 having a slag outlet 7 and a damper 8 inside is provided on the front side.
However, on the sides perpendicular to the combustion burner and the slag outlet, charging ports 10 for the material to be melted are provided in advance to form a molten metal. Further, as shown in FIG. 3, the pump chamber B is covered with a lid 12 having an exhaust port 11, and the dissolution chamber C is covered with an exhaust port 1
3 and has a weight part 14 integrally formed on the lower side and is covered with a lid 15 that can be raised and lowered. A sprocket wheel 1 is attached to one end of the chain 16 to be mounted on the lifting means.
7 and 18, and is configured to be lowered from the solid line position to the two-dot chain line position, or vice versa, by driving the chain.

Note that 19 indicates a hood to be attached to the ceiling beam 20, and 21 indicates the hot water level.

Thus, in the melting furnace according to the present invention having the above configuration, empty cans of aluminum, zinc, lead, etc.
A thin material to be melted such as foil or scrap is melted in advance at another location, and then the obtained molten metal is placed in the heating heating chamber A and the melting chamber C so that the material to be melted is not oxidized by the flame of the combustion burner 6. Either the material to be melted is stored until it reaches the upper surface of the first metal passage D, the second metal passage E, and the third metal passage F, or the material to be melted is put into the heating heating chamber A through the charging port 10 and heated to the combustion burner 6. After melting and forming molten metal up to the molten metal level 21, if the metal circulation pump 4 in the pump chamber B is activated, the heating temperature riser chamber A
The molten metal inside is heated by the combustion burner and introduced into the pump chamber B from the first metal passage D, and then from the spout 5 of the pump to the second metal passage E.
It reaches the melting chamber C through the metal passageway F, and is then sent into the heating heating chamber A through the third metal passage F.

In this way, in the process of melting the material to be melted or the scrap that is to be introduced into the melting chamber C with the circulating molten metal by the metal circulation pump 4, when the temperature inside the melting furnace is low, such as after a holiday, , it is necessary to preheat and raise the temperature of each chamber before charging the material to be melted or scrap, and in order to facilitate such preheating and temperature rise, pump chamber B and melting chamber C are
The desired purpose can be achieved by attaching a lid 12 having exhaust ports 11, 13 and a lid 15 integral with the weight portion 14.

In addition, since the weight portion 14 is integrally formed on the lid 15 to be attached to the melting chamber C, opening and closing operations are facilitated, and the thicker the lid, the more the insulation effect increases, so the pump chamber B It is possible to prevent the melting chamber C from being cooled.

Next, FIGS. 4 and 5 show a melting furnace according to another invention, in which the same parts as the melting furnace described above are given the same reference numerals.
are installed separately with a single lid 15' and a weight 14', and these are connected to chains 16', 16'' and sprocket wheels 17', 17'': 18', 1, respectively.
8", which can be opened and closed or raised and lowered, so that even if the lower part of the material piled up in the melting chamber C melts and flows out, the upper part of the material to be melted is not pushed downward. If a hanging phenomenon occurs, open the lid and lower the weight, which is movable up and down above the melting chamber, from the solid line position shown in Figure 4, and the impact will eliminate the shelf hanging phenomenon. This allows for smooth molten metal circulation.

As described above, according to the present invention, since the melting chamber and the pump chamber are each covered with a lid having an exhaust port, when the temperature inside the furnace is low after a holiday, etc., the material to be melted can be This has the effect that the melting chamber and pump chamber can be easily preheated and heated before being charged.

Further, according to the present invention, since the lid to be attached to the melting chamber is integrally formed with a weight portion that promotes melting of the material to be melted, the material to be melted is constantly kept during the melting operation. The material to be melted at the bottom can be pressed downward to promote melting, and the material to be melted in the lower part can be sequentially forced downward to make good contact with the circulating molten metal. It can also greatly contribute to the prevention of oxidation and can be expected to save a lot of resources. Furthermore, as mentioned above, the weight part of the lid always presses the material to be melted downward, so there is no shelf-hanging phenomenon, and in addition, the lid and the weight part are integrated. Operations such as opening and closing become easier,
Moreover, since the heat insulation is strengthened by the thicker lid, it also has the effect of preventing the melting chamber and the pump chamber from being cooled.

Further, according to the present invention, in addition to the lid to be attached to the melting chamber, a weight is provided above the melting chamber so as to be able to raise the temperature, and when the shelving phenomenon occurs, the weight is lowered and the melting chamber is lowered. By applying an impact to the material to be melted, the material to be melted is caused to collapse, thereby eliminating the hanging phenomenon and allowing smooth circulation of the molten metal.

In this way, the melting of the material to be melted can be promoted without being oxidized or burned, and the aluminum content can be recovered well and the yield can be improved.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view showing a melting furnace according to the present invention, Fig. 2 is a cutaway plan view taken along the - line in Fig. 1, and Fig. 3 shows a part of the case where the pump chamber and melting chamber are covered. FIG. 4 is a drawing similar to FIG. 1, which is omitted, and FIG. 4 is a drawing similar to FIG. 1 showing a melting furnace according to another invention. FIG. 5 is a cutaway plan view taken along the line - in FIG. Note that the correspondence relationship between the main parts shown and the symbols is as follows. A... Heating warming chamber, B... Pump room, C... Melting chamber, D, E, F... First, second, third metal passages, H... Partition wall, 1... Melting furnace main body, 4 ...Metal circulation pump, 6...Combustion burner, 11, 13...
...Exhaust port, 12...Pump chamber lid, 14...Weight portion, 14'...Weight, 15...Weight and melting chamber lid, 15'...Dissolution chamber lid.

Claims (1)

[Scope of Claims] 1. A heating heating chamber for molten metal having a pair of combustion burners, a pump chamber having a metal circulation pump, and a melting chamber for charging material to be melted are installed in a square arrangement in a substantially rectangular furnace shell. By making these chambers communicate with each other through metal passages, and by separating the heating chamber and the melting chamber with partition walls, flames from combustion burners and high-temperature combustion gas can reach the material to be melted. In a melting furnace of the type in which the material to be melted is melted by heat transfer and temperature increase due to circulating contact of the molten metal brought about by the pump operation without direct contact, exhaust ports are provided in the melting chamber and the pump chamber, respectively. In this case, a lid with
A melting furnace characterized in that a weight portion is integrally formed on a lid to be attached to the melting chamber for constantly pressing the material to be melted downward to promote melting. 2. A heating heating chamber for bath water having a pair of combustion burners, a pump chamber having a metal circulation pump, and a melting chamber for charging the materials to be melted are installed in a square arrangement in a roughly rectangular furnace shell, and each of these chambers is arranged in a square shape. The heating chamber and the melting chamber are connected to each other by a metal passage, and the heating chamber and the melting chamber are separated by a partition wall so that the flame of a combustion burner or the like and high temperature combustion gas do not come into direct contact with the material to be melted. In a melting furnace of a type in which the material to be melted is melted by heat transfer and temperature increase due to circulating contact of the molten metal brought about by the operation of the pump, a lid having an exhaust port is attached to each of the melting chamber and the pump chamber. And in this case,
A melting furnace characterized in that a weight is provided above the melting chamber so as to be movable up and down, and when a shelving phenomenon occurs, the weight is lowered to apply an impact to the material to be melted in the melting chamber.