JPS6237316B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a melting and holding hand furnace for low melting point metals which is novel and has great industrial applicability. In recent years, casting and die-casting factories for low-melting metals such as aluminum alloys and zinc alloys have been under pressure to respond to demands for higher quality products and diversification of the chemical composition of alloys. In order to meet such demands, measures have been taken such as using crucible-type melting furnaces as hand-held furnaces.
There are problems with temperature control, removal of oxides, continuous production of molten metal, etc. In addition, this type of production process produces 4000 to 6000 kcal per 1 kg of product.
of heat energy, which goes against social demands for energy conservation and creates a cost increase factor.
In short, there is a lack of effective means to meet the demands for higher quality products and diversification of the chemical composition of alloys, leading to decreased productivity, consumption of a large amount of energy, and increased costs. This is the current situation. The object of the present invention is to fundamentally solve the above-mentioned conventional problems in processing low-melting point metals using a novel melting and holding furnace. Next, the configuration of the present invention will be explained with reference to the drawings showing one embodiment. Reference numeral 1 denotes a melting tank, in which a low melting point metal such as an aluminum alloy is melted in the tank by a gas burner 3 disposed on the outer peripheral wall 2, and the drawing shows two gas burners 3, 3 disposed. This shows how it was done. Reference numeral 4 denotes a temperature-raising gas burner disposed, for example, on the upper wall of the melting tank 1, and the gas burner 4
It is appropriate to heat the molten metal at around 580°C to around 680°C. It goes without saying that the gas burners 3 and 4 may be replaced with burners that use liquid fuel. Reference numeral 5 denotes a heat-retaining tank, which is installed adjacent to the melting tank 1 via a damper 6 for preventing oxide outflow, and stores the molten metal flowing down due to the slope of the bottom surface 7 of the melting tank in a molten metal reservoir 8 below. shall be taken as a thing. The damper 6 for preventing oxide outflow may be provided in one piece, but as shown in the figure, a plurality of dampers 6 may be provided so that there is a slight gap between the adjacent dampers 6 and the inner surface of the side peripheral wall. It is preferable to provide a clearance in view of manufacturing and maintenance of the damper 6 for preventing oxide outflow. Reference numeral 9 denotes an immersion heater hanging from the top of the heat-retaining tank 5, which is submerged into the stored molten metal to maintain the stored molten metal at a constant temperature. It is preferable to automatically maintain the temperature at an appropriate temperature within the range of 2.5 DEG C. to -2.5 DEG C., and the drawing shows an embodiment in which two immersion heaters 9, 9 are provided. Reference numeral 10 denotes a gas inlet which is drilled in a suitable place on the bottom wall of the heat-retaining tank 5, and separates impurities, intermediate compounds, etc. in the stored molten metal by injecting an inert gas such as argon into the tank. The molten metal shall be cleaned. Reference numeral 11 is a tap hole drilled at a suitable location on the side wall of the heat-retaining tank 4, and is used for taking out the residual material accumulated in the heat-retaining tank 5. Next, reference numeral 12 denotes a pumping tank which is installed adjacent to the heat-retaining tank 5 via a filter 13 for filtration and a damper 14 for preventing outflow of oxides, and is prepared for pumping out molten metal. Then, the pumping tank 12 is
The melting tank 1 and the heat-retaining tank 5 are integrally connected to constitute the melting furnace of the present invention. Note that the drawing shows a mode in which the filter 13 for filtration and the damper 14 for preventing oxide outflow are connected vertically. Reference numeral 15 denotes a hot water level sensor disposed at a suitable location above the pumping tank 12, which is connected to the gas burner 3 for melting disposed in the melting tank 1, and automatically detects the temperature depending on the amount of molten metal in the pumping tank 12. By controlling the gas burner 3 of the melting tank 1, the amount of molten metal produced in the melting tank 1 can be freely adjusted. Note that 16 in the drawings is a side door. As is clear from the above structure, the melting and holding furnace according to the present invention has the following effects. (a) The melting tank 1, heating tank 5, and pumping tank 12 are integrated, and the melting, heat retention, and pumping out of low-melting point metals are carried out organically, dramatically improving productivity and significantly reducing energy consumption. This greatly contributes to cost reduction and improvement of product quality. In particular, the melting gas burner 3 installed in the melting tank 1 is controlled by the hot water level sensor 15 installed in the pumping tank 12, so that the amount of molten metal produced can immediately respond to the pumping amount, which is highly effective. It is. Now, if we compare the energy consumption and productivity with the conventional crucible-type melting furnace, they are as shown in Tables 1 and 2 below, respectively.

[Table]

[Table]
(b) The above-mentioned integrated structure of the melting tank 1, heat retention tank 5, and pumping tank 12 allows the use of highly airtight castable lining for reducing through-flow heat, the adoption of a multilayer wall structure to improve the heat insulation effect, and melting. Energy saving effects can be further developed by means such as material preheating using waste heat. (c) Melting tank 1 in which low melting point metal is melted with a gas burner
The structure has a heat insulating tank 5, which maintains the stored molten metal at a constant temperature using an immersion heater, installed adjacent to each other, so that the immersion heater operates as a heat source and generates low noise with almost no actual harm (measured value). A=
40~42 horn) is a complete solution to the noise pollution of traditional handheld furnaces. (d) By adopting the immersion electric heating method using the immersion heater 9, the molten metal heating effect and the energy saving effect are greatly added. (e) Without using expensive crucibles as in the past,
In this respect as well, it greatly contributes to cost reduction. (f) Due to its configuration, a high degree of safety can be ensured. (g) Depending on the case, it is also possible to remove the dissolution tank 1 and use the heat retention tank 5 and the pumping tank 12 as a dedicated mechanism for heat retention.

[Brief explanation of the drawing]

Each of the drawings shows one embodiment of the melting and holding furnace of the present invention, and FIG. 1 is a vertical side view, and FIG.
The figure is a cross-sectional plan view taken along line AA in FIG. 1. In the drawing, 1 is a dissolution tank, 3 and 4 are gas burners, and 5
1 is a heat retention tank, 6 is a damper for preventing oxide outflow, 9 is an immersion heater, 10 is a gas inlet, 12 is a pumping tank, 1
3 is a filter for filtration, 14 is a damper for preventing oxide outflow, and 15 is a hot water level sensor.

Claims (1)

[Claims] 1. A melting tank in which a low melting point metal such as an aluminum alloy is melted with a gas burner, and the temperature of the molten metal is further raised with a heating burner, which is installed adjacent to the melting tank via a damper for preventing oxide outflow, and the melting The molten metal obtained in the tank is stored in a flowing tank, and an immersion heater is used to maintain the stored molten metal at a constant temperature, and an inert gas such as argon is introduced through a gas inlet to remove impurities, intermediate compounds, etc. It is integrally composed of a heat-retaining tank that separates and removes oxides, and a pump-out tank that is installed adjacent to the heat-retainer tank via a filter for filtration and a damper to prevent oxides from flowing out. A melting and holding furnace for low melting point metals, comprising a sensor and a burner disposed in the melting tank so that the amount of melting in the melting tank can be adjusted.