JPS59161673A - Metal melting retaining furnace - 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 The present invention relates to a metal melting and holding furnace for continuously melting and holding metals such as aluminum, and can be used as a molten metal replenishment system for a hand furnace.

Traditionally, molten metal replenishment systems for hand furnaces include one that uses a lumbo furnace for continuous melting, and one that transports molten metal from a concentrated melting furnace to a hand furnace dedicated to a holding furnace and distributes it1. . However, in the case of the 111J crucible furnace, the mixed material is inserted directly into the molten metal and melted, so a small amount of material is periodically added to the 1fkJ 19.1 section. In addition to the problems of low melting capacity and low thermal efficiency, there was also the problem that crucible furnaces required a lot of maintenance, and the maintenance costs were high. In addition, in the case of the latter concentrated melting method, large fluctuations in the amount of melting result in a large loss in terms of total cost, so it is necessary to always secure a large amount of melting, and the yields are diverse. There is a problem that it is difficult to use it for melting materials such as aluminum that have been used for melting.Moreover, since the temperature of the molten metal decreases during the dispensing process, the temperature If from the central melting furnace must be increased by the amount of the decrease. There was an energy saving problem.

Therefore, the present invention is designed to solve the above-mentioned problems, and it is possible to improve the melting ability and thermal efficiency of materials, significantly reducing costs, and it is also possible to melt a large variety of materials in small quantities. The object of the present invention is to provide a metal melting and holding furnace that can be used at a low cost and also improves the quality of the molten metal pumped out.

Below, drawings showing examples of the main enclosure will be described.

Reference numeral 1 denotes a furnace body having a covering part 1a, which includes a furnace wall made of strong refractory material, an insulating material that prevents heat dissipation by covering the outside of this furnace wall with metal, and iron plates that reinforce the furnace shell. It is composed of furnace materials. The planar shape of the furnace body 1 is extremely compact as shown in FIG. 3 due to the work space. In the furnace body 1, 2 is a holding chamber formed to store molten metal a, 3 is a melting chamber for melting aluminum material A as a side slope to be melted, and 4 is for preheating aluminum material A. The holding chamber 2 and the melting chamber 3, the holding chamber 2 and the preheating chamber 4, and the melting chamber 3 and the preheating chamber 4 are separated from each other by heat conductive partition walls 5, '6, and 7, respectively. There is. The floor surface 2a of the holding chamber 20 is formed in an inclined state so as to be lower toward the pumping chamber, which will be described later, as shown in the figure, and the inner surface 2b on the pumping chamber side, which will be described later, is formed into an arc-shaped curved surface. There is. ′! ! -', the floor surface 3a of the dissolution chamber 3 is formed to be higher than the floor surface 2a of the holding chamber 20, and the floor surface 3a and the floor surface 2a are
A step is formed between a. The preheating chamber 4 is formed high in the shape of a tower, and a material input port 9 is formed in the upper part of the preheating chamber 4. The floor surface 4a of this preheating chamber 4 is formed to be the same as or higher than the floor surface 3a of the melting chamber 30. In terms of heat exchange efficiency, it is preferable to make the vertical length of the preheating chamber 4 as high as possible in consideration of workability. Next, 10 pairs of guide rails were fixed to the furnace body 1 so as to be located on both sides of the material input port 9, and 11 was a plate-shaped input port cover for opening and closing the material input port 9. A pair of wheel racks attached to both sides of the rail are rotatably mounted on the guide rail 10. One side of the input port cover 11 is located at approximately the same height as the upper end of the material input port 9, and the material input port 9 can be opened and closed by moving the input port cover 11.
Ru. An exhaust port 13 is formed in the input port cover 11, and can be opened and closed by an exhaust volume adjusting damper 14 mounted on the input port cover 11.

A melting burner 15 is provided on the wall 3b of the melting chamber 3, and is oriented toward the preheating chamber 4 so as to heat the material A placed in the melting chamber 3. This melting burner 15 is composed of a FiE M B gas burner. Note that the present application is not limited to the MB gas burner. This)'' MB gas burner has a lower temperature than the conventional high-speed burner shown in Figure 5 (1).
It has the characteristic of burning at a low speed and with a red flame, and is
As shown in Figure (2), the length of the burner frame is approximately 2j times longer than that of a conventional high-speed burner, and this burner frame extends toward the bottom of the preheating chamber 4 as shown by the arrow. . The flame temperature of this HMB gas burner 2 is as low as approximately /10θ°C no matter which part of the burner frame is measured, and the temperature of the atmosphere inside the furnace is also low. The burner frame of the old HMB gas burner contains a large amount of infrared rays, and the furnace material also emits a large amount of infrared rays, so the heat absorption effect of aluminum is very good, and the fuel consumption for maintaining melting can be reduced. can. In addition, the above-mentioned dissolving barb-1
It goes without saying that the combustion unit required for combustion, such as a blower and a pressure gauge, is attached to 5 and the holding burner described later. 16 is a communication hole provided in the partition wall 7 between the melting chamber 3 and the preheating chamber 4, through which the heated gas of the melting burner 15 (including the burner frame) flows into the preheating chamber 4 to
It is provided so that the material placed below the material A can be dissolved. The communication holes 16 are provided at the lowest part of the melting chamber 7 at intervals of μ so that the molten metal melted in the lower part of the preheating chamber 4 flows into the melting chamber 3 without accumulating in the preheating chamber 4. Y7 is a holding burner provided in the chess part 2G of the holding chamber 2, and is used to prevent the upper surface of the molten metal a stored in the holding chamber 2 from cooling down and to keep it warm. Of (1
i! It is placed horizontally facing tin 2 b and sunk. 1 This holding burner 17 is the same as the melt 1 burner 15 described above, is burnt by the MB gas burner, and the long cass frame of the Hh4B gas burner is attached to the upper surface of the molten metal a in the holding chamber 2 as shown by the arrow. Upper holding chamber 2
It is adapted to extend along the inner side lti 2 b of.

In addition, the above-mentioned holding burner 17 is used to store 2L of molten metal in the holding chamber 2.
In order to keep the humidity constant, the
Ignition occurs according to instructions from a thermometer (not shown) consisting of a couple.
The fire is extinguished automatically. Note that the holding burner 17 is also a HΔ4B gas burner V.

It is not limited. 18 is the above-mentioned holding chamber 2 and dissolution chamber 3
A hole is provided at the bottom of the partition wall 5 so that the molten metal can flow from the melting chamber 3 to the holding chamber 2 through a communication hole provided in the partition wall 5 between the two.
f, and this communication hole 18 is connected to the holding burner 17.
The heating gas is formed so that it can be passed through when flowing -C into the melting chamber 3 from the Ni ¥2. The communicating bill stop is provided near the side wall 2C provided with the holding burner 17, so that the heated scum of the holding burner 17 is approximately -
After being sufficiently heated by circulating it, it is directed into the melting chamber 3 through this communication hole 18. Reference numeral 19 denotes a pumping chamber which is adjacent to the holding chamber 2 and is formed by a pumping chamber wall 2 which is open at the top with a pumping port.
The work log storage room 2 is divided by a partition wall ρ formed from a part of the furnace body 1. The pumping chamber wall 2] is constructed integrally with the furnace body 1, and also has a thermal insulation structure like the furnace body 1.
? It is reeded. The pumping outlet 20 of the pumping chamber 19 has a lid 20.
It can be closed by a.

B is a communication hole provided in the above-mentioned partition wall, which allows the holding chamber 2 and the pumping chamber 19 to communicate with each other. This communication hole is provided at a position below the upper surface of the molten metal a stored in the holding chamber 2. θ(, Tsutomu is a working opening provided in the side wall 2d of the holding chamber 2, Ang is a working opening provided in the side wall 3C of the melting chamber 30, and Frost is a working opening formed in the side wall 4b of the preheating chamber 40,
Each chamber is sufficiently large to allow easy inspection, monitoring, and cleaning of the entire area. Working sections I to 4 are hinged to the above working openings so that they can be opened and closed. is sealed by locking the handle Z71L-3a to the hooks 30-32.

Next, an example of use will be described in which aluminum foil A is melted and held using the metal melting and holding furnace configured as described above. First, the melting burner 15 and the holding burner 17 are ignited to heat and keep the melting chamber 3 and the holding chamber 2 warm. The heated gas from the melting burner 15 enters the preheating chamber 4 through the communication hole 16, passes through the preheating chamber 4, and is discharged from the exhaust port 13. Rear communication hole 18
It enters the melting chamber 3 through the through hole 16 and the preheating chamber 4.
and is discharged to the outside from the exhaust port 13. In this state, move the input port cover 11 laterally to open the material input port 9, and preheat aluminum material A (cold material) from the material input port 9 for ¥4
After that, the material input port 9 is closed again with the input port cover 11. Even if the aluminum materials A are put into the preheating chamber 4 as described above, there are gaps between the inner surface of the preheating chamber 4 and the aluminum materials A and between the aluminum materials, and the heating gas of both burners IFI and 17 is It passes through the above-mentioned gaps in the preheating chamber 4 and is discharged to the outside. Therefore, the aluminum material placed in the preheating chamber 4 is heated by exchanging heat with the heating gas, and the heating gas is discharged after being lowered in temperature by the heat exchange, thereby making effective use of thermal energy. . The aluminum material A introduced into the lower part of the preheating chamber 4 is heated and melted by the heating gas (burner flame) of the melting burner 15, and the molten aluminum in a semi-solid solution state is melted from the communication hole 16. Flows into room 3. The molten, semi-solid solution aluminum that has flowed into this melting chamber 3 is
While flowing down, it is heated and melted by the burner flame of the melting burner 15 and the heating gas of the holding burner 17, and its temperature is raised. Thereafter, the molten aluminum in the melting chamber 3 flows into the holding chamber 2 through the communication stop.

In this case, since the heated scum from the q holding burner 17 is passing through the communicating hole 18 from the holding chamber 2 toward the melting chamber 3, the molten aluminum flows down through the communicating hole 18 as described above.
This molten aluminum is also heated by heating gas from a holding burner 17, and this heated molten aluminum flows into the holding chamber 2. The molten aluminum that has flowed into the holding chamber 2 is stored as molten metal a in the lower part of the holding chamber 2 as shown in Fig. 2, and a portion of it flows into the pumping chamber 19 through the communication hole 23. The molten metal a stored in the holding chamber 2 normally closes the communication hole with the outlet chamber 19. Therefore, the heated gas of the holding burner 17 in the holding chamber 2 can be prevented from being blown out from the pumping process, and the operator can perform the molten metal pumping operation 4 without being affected by the waste. I can do it. It is possible to prevent the scum generated on the upper surface of the molten metal a in the molten metal holding chamber 2 from flowing out into the pumping chamber 141, and the quality of the molten metal pumped out from the pumping chamber 19 can be improved, thereby preventing molding defects of the cast product. You can lower the chozo.

In addition, noise from the holding burner 17 in the holding chamber 2 is pumped out,
It is possible to prevent leakage directly from the opening to the outside, and the operating noise can be extremely low (for example, about 70 to 73 phons around the furnace). Next, the molten metal a stored in the holding chamber 2 is heated and moisturized by the heating gas from the holding burner 17. In this case, since the IIΔIB gas burner is used as the holding burner 17, the temperature of the burner frame can be reduced by approximately 1/1.
The temperature can be as low as 00°C, thereby reducing metal loss in the molten metal a and damage to the furnace materials, and reducing the amount of debris mixed into the molten metal a, making it safe to use for casting important safety parts for automobiles. In addition, the humidity in the burner frame is low and the heat transfer to the molten metal is effective, so the holding chamber music [
(The temperature of the molten metal a in the holding chamber 2 is determined by the thermometer in the pumping chamber 19 when the holding burner 17 is set to 0.
It is controlled by being turned off. In this case, as mentioned above, the temperature of the molten aluminum flowing into the holding chamber 2 has been raised by the heated gas from the melting burner 15 and the holding burner 17, so the molten aluminum from the melting chamber 3 is added to the molten metal a in the holding chamber 2. Even if ml of aluminum flows in, the molten metal a
Fluctuations of 1 degree of retained wetness can be made extremely small, and in the case shown in the drawing, it has become possible to control the hot water temperature to a maximum retention temperature of 7°C ± 3'C.

Next, when the Aldol phase A is melted by the melting burner 15, since the melting burner 15 is an HM B gas burner, metal loss and damage to the furnace side can be prevented, and the temperature of the burner frame is low. Since the burner frame is prevented from hitting the aluminum material A from close range, the formation of hard α-alumina can be slightly reduced, which not only improves the quality of the molten metal but also simplifies the process of removing redness. And it can be done in a short time. As mentioned above, the aluminum foil A heated in the preheating chamber 4 is melted by the melting burner 15, and the HΔ113 gas burner is used to enhance the heat absorption effect on the aluminum material, making the melting efficiency extremely high. This allows for lower fuel consumption and lower running costs.

Furthermore, since the heat dissipation of the furnace body 1 is suppressed to a low level, the furnace surface humidity can be lowered to about jθ°C to 75°C, and the working environment can also be improved. It is preferable to input the aluminum material A from the material input port 9 continuously at short intervals, and this input may be performed either manually or automatically using a conveyor or the like.

An example of each take in the use of the apparatus of the above-mentioned actual 1111M example is as follows.

Fuel used: i, PG p-illu) gas/3
000Kca'y'yyf melt angle RL Pu7
/! ;Okg/Hr holding capacity -s o o
kg Input material Ingot (5kg block) Manual input 18M
Efficiency S% ＜'A90000KcaβON) Retention h 'iFi+ 35rO7DO&aI/I(r
Pumping chamber molten metal temperature and humidity 750°C + 3°C Indoor molten metal temperature 76 θ°C ~ 7 θ°C
ljθ°C ~ 70°C Furnace surface temperature 5θ°C ~
73°C Exhaust gas temperature 4L30'C-33θ''C Noise 70~7S As mentioned above, in the present invention, the furnace body 1 having the covering part is configured to store molten metal. A holding house 2, a melting chamber 3 for melting the material, and a preheating chamber 4 having a material input port 9 in the upper part and preheating the side layer charged from the material input port 9 are combined. The melting chamber 3 is equipped with a melting burner 15 that heats the material placed in the melting chamber. 3 and the preheating chamber 4 is provided with a communication hole 16 through which the heated gas from the melting burner 15 can flow into the preheating chamber 4 and melt the material placed below the preheating chamber 4. , on the wall of the holding chamber 2, to prevent the upper surface of the molten metal stored in the holding chamber 2 from cooling,
L.

The holding burner 17, which can be kept warm, is set a'if,
Furthermore, a step is provided between the dissolution chamber 3 and the holding chamber 2 so that the surface of the dissolution chamber 3 is higher than the floor surface of the holding chamber, and a partition wall 5 between the dissolution chamber 3 and the holding chamber 2 ( A communication hole 18 is provided to allow the molten metal to flow from the holding chamber 3 toward the holding chamber 2, and this communication hole 18 is used to allow the heated gas from the holding burner 17 to flow from the holding chamber 2 into the molten chamber 3. Furthermore, a pumping chamber 19 is provided which is open at the top and is in contact with the holding chamber 2, and the pumping chamber 19 and the holding chamber 2 are designed to allow the molten metal stored in the holding chamber 2 to pass through in a normal state. (a) If you want to melt a material such as aluminum and use the molten metal for casting, you can insert the material into the material inlet. 9, the material can be melted in the melt/cooler 15 and the molten metal can be flowed into the holding chamber 2, and the molten metal in the holding chamber 2 can be pumped out from the pumping chamber 19 when necessary for VF production. It can be used for many purposes, and can be effectively used as a handheld furnace.

(b) Moreover, even if the melting material input from the material input port 9 is made to flow into the holding chamber 2 as described in - above, the side slopes input from the material input port 9 cannot be melted. The temperature of the molten metal can be raised by the melting burner 15 before the molten metal flows into the holding chamber 2, and the change in humidity of the molten metal in the holding chamber 2 due to the molten metal flow can be minimized. This prevents the ability to dissolve the material from being limited by the temperature of the water in the holding chamber, thereby increasing the ability to dissolve the material.

Further, in this invention, as mentioned above, the heated gas from each of the melt j:f (no-cooler 15 and the holding burner 17 is discharged through the preheating chamber, respectively), so that the above (a), ( (b) In addition to this, (c) the material input from the material input port 9 into the preheating chamber 4 can be heated by the waste from the melting burner 15 and the holding/cooler 17 prior to melting; As a result, the amount of waste used in the melting burner L5 required for melting the material per unit weight can be reduced, and fuel efficiency can be significantly improved.

In addition, in this invention, ( is, as described above,
Since the molten metal in the holding chamber 2 is communicated with the pumping chamber 19 through a row of communicating holes below the upper surface of the molten metal in the holding chamber 2, the molten metal in the holding chamber 2 is kept in the core and the burner 17 is used to remove the molten metal. Even if the molten metal is 6, the holding burner 17 is used when pumping out the molten metal from the pumping chamber 19.
It is possible to prevent the exhaust gas from blowing out from the pumping chamber 19 to the outside, and to maintain a good working environment in the vicinity of the pumping chamber 19,
The deposits in the holding chamber 2 can be prevented from flowing into the pumping chamber 19, and the quality of the molten metal in the pumping chamber 19 can be improved.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and include Figure 1 (1 front view,
Fig. 2 is a right side view of the sugar diagram, Fig. 3 is a cross-sectional view taken along the line 1n-111 with a portion omitted, and Fig. 5 is a cross-sectional view taken along the f', l-IY line with a portion cut away. FIGS. 5(1) and 5(2) are explanatory diagrams showing a high-speed burner and a high-speed burner frame. 1... Furnace body, 2... Holding chamber, 3... Melting chamber, 4...
・・Preheating chamber, 5, 6.7 ・・Partition wall, 9・・・・Material stock, 15・・・・Dissolution nozzle 5.16
...Communication hole, 17...Holding/(-ner, 1
8...Communication hole, X9...Dumping chamber, Phantom...Communication hole. Fig. 1 19 23 1'7 Fig. 2 Fig. 3 360- Fig. 5 (1) (2)

Claims (1)

[Claims] Inside the furnace body having a cover, there is a holding chamber for storing molten metal, a melting chamber for melting the material, and a material inlet at the top, which allows the material to be input from the material inlet. A preheating chamber for preheating is separated from each other by a partition wall <Ijj
The wall of the melting chamber is equipped with a melting burner capable of heating the material placed in the melting chamber, and the heating residue of the melting burner is installed on the partition between the melting rate and the preheating chamber. A continuous hole is provided to allow the material to flow into the chamber and melt the material placed below the preheating chamber, while the wall of the holding chamber prevents the upper surface of the molten metal stored in the holding chamber from cooling down. Furthermore, a step is provided between the melting chamber and the holding chamber so that the floor surface of the melting chamber is higher than the floor surface of the holding chamber. A communication hole is provided in the partition wall to allow the molten metal to flow from the melting chamber to the holding chamber. Furthermore, a pumping chamber with an open upper part is provided in contact with the holding chamber, and the pumping chamber and the holding chamber are located below the normal upper surface of the molten metal stored in the holding chamber. A metal melting and holding furnace characterized in that the metal melting and holding furnace is connected to each other by a communication hole provided in the metal melting and holding furnace.