JPH03199317A - Melting furnace - Google Patents

Abstract

PURPOSE:To prevent the clogging of the outflow port of a melting furnace at the time of melting and to assure the smooth outflow of a molten metal by disposing a flow regulating plate of a specific shape consisting of a specific metal into the bottom of the furnace body of the melting furnace of an instantaneous melting device for Al metal ingots. CONSTITUTION:The annular flow regulating plate 7 which is made of, for example, a cast iron having the m.p. higher than the m.p. of the metal to be melted, is coated with a refractory material on the surface and has a slit 72 opened through the front and rear surfaces in the radial direction is disposed concentrically with the pass port 33 of the furnace body 31 in the bottom of the furnace body 31. The molten metal passes the hole 71 of the plate 7 and flows out of a pass port 33 when a coolant is melted by operating an induction coil 32. The remaining molten metal in the furnace body 31 sticks to the plate 7 and solidifies to clog the hole 71 upon stopping of the operation of the coil 32 but the size of the hole 71 is smaller than the port 33 and a supporting member 8 exists and, therefore, the port 33 is not clogged. The plate 7 is heated simultaneously with the coolant 2 in the furnace body 31 when the coil 32 is operated again. The lump sticking thereto is slightly less than the coolant in the furnace body and is, therefore, melted first and the molten metal flows out smoothly.

Description

DETAILED DESCRIPTION OF THE INVENTION 1. Field of Industrial Application] The present invention relates to a structure of a melting furnace suitable for use in an instant melting apparatus for aluminum-based metal ingots (hereinafter referred to as aluminum ingots).

``Traditional technology 1: When molding molten aluminum metal into parts for machines, electrical equipment, etc. by die casting, etc., the process involves melting the aluminum, F), raising the temperature of the molten metal to an appropriate temperature, and tapping the molten metal. There is an instant melting device as a device that performs operations quickly and continuously, and the melting furnace used in this instant melting device will be explained with reference to FIG.

Figure 3 shows the entire instant melting device. In this figure, 1 is a Japanese cypress material intrusion guide, and the material is an aluminum ingot (hereinafter referred to as
It is called cypress wood. 2 into the melting furnace 3 in an upright state, and prevents the molten metal melted in the melting furnace 3 from scattering outside. The melting furnace 3 is made of a refractory material and has an upright hollow cylindrical shape with a bottom, and includes a furnace body 31 that can store the cypress material 2 in an upright state, and a furnace that heats and melts the cypress material 2 from its surface. The induction coil 32 provided on the outer periphery of the body 31 and the furnace body 31
It consists of an outlet 33 opened in the bottom wall of the tank.

Reference numeral 4 denotes a heating furnace disposed coaxially below the melting furnace 3, which includes an upright hollow cylindrical furnace body 41 with a bottom made of refractory material, and an outer periphery of the furnace body 41 for heating the molten metal inside to an appropriate temperature. An induction coil 42 provided and an outlet 43 opened in the bottom wall of the furnace body 41
It consists of Reference numeral 5 denotes a hollow tubular tapping pipe that surrounds the outflow 143 from the outside and extends downward, communicating with the heating furnace 4, and a tapping port 51 is provided below. 6 is the hot water tap 5
Molten metal is regulated and discharged from the tap 51 by an electromagnetic pump disposed on the outer periphery of the tap 1151 at a position below the tap 1151.

Next, the overall operation of the instant melting device No. 1111 will be explained.

The cypress wood 2, which is guided by the material feed guide 1 and sent into the melting furnace 3 in a vertical state, is heated by the action of the induction coil 32 and melted from the surface to become molten metal, and this molten metal is passed through the outlet 33. The molten metal flows out into the heating furnace 4 , passes through the outlet 43 , and flows into the tapping pipe 5 . Here, if the electromagnetic pump 6 is adjusted so that the molten metal does not flow out from the tap outlet 51, and the induction coil 42 is energized, the molten metal is pooled in the heating furnace 4 and is heated to an appropriate temperature. ¥! maintained at a certain degree. Then, the electromagnetic pump 6 is adjusted to discharge the molten metal of jJfl from the tap 51 to a guicast machine (not shown) or the like.

[Problem to be solved by the invention]

By the way, in the melting furnace 3, when the operation of the induction coil 32 is stopped, the molten metal remaining in the furnace body 31 hardens near the outlet 33 and clogs the outlet 33. Next, when the induction coil 32 is operated again, the cypress wood 2 is melted before the lump is melted, so the newly melted molten metal cannot immediately flow out from the outflow 033.

This causes a number of problems, for example, the molten metal that cannot flow out is scattered inside the furnace body 31, and the furnace body 31 is at a low temperature.
It adheres to the inner wall of the upper part and becomes a lump, and this lump grows as the induction coil 32 repeatedly stops and starts, and finally, the new cypress wood inserted into the four-material insertion guide 1 descends into the furnace body 31. This caused a qm that would interfere with the

This invention was made in order to solve the above-mentioned problem, and an object of the present invention is to provide a melting furnace in which the generated molten metal can flow out smoothly at any time.

[Means to solve the problem]

In order to achieve the above object, the melting furnace of the present invention melts a metal whose melting point is higher than that of the metal to be melted! 8! (Preferably,
A rectifier plate, which is a ring-shaped member made of cast iron and whose surface is coated with a refractory material, and has slots that penetrate through the front and back in the radial direction, is installed at the bottom of the furnace body. It is placed at the bottom so that it is concentric with the outlet.

In order to smoothly flow out the molten metal from the outlet, the inner diameter of the rectifying plate is preferably smaller than the diameter of the outlet.

[Operation 1] In the above configuration, when the induction coil of the melting furnace is operated, the cypress wood in the melting furnace is melted and the molten metal flows out from the outlet as in the conventional case, but when the induction coil is stopped, The molten metal remaining in the melting furnace without flowing out from the outlet adheres to the rectifying plate and hardens, clogging the holes in the rectifying plate.

Next, in order to melt the four materials again, we installed an induction coil at 171
When this happens, an induced current flows through the cypress wood and at the same time an induced current flows through the metal rectifier plate, which heats up the rectifier plate, melts the adhered solids, and prevents the holes in the rectifier plate from becoming clogged. will be resolved. By the way, since the lump is much smaller than the Japanese cypress material, it is melted before the Japanese cypress material, so the outflow of the molten metal from the melting furnace is not obstructed. In addition, the rectifier plate has a higher melting point than cypress wood, and the slits limit the amount of induced current that flows, so it does not melt itself.

Embodiment 1 Next, an embodiment of the present invention will be explained based on FIGS. 1 and 2. In FIG. 1, the same symbol as the melting furnace shown in FIG. The configuration is similar to that of .

FIG. 2 shows the entire ring-shaped straightening plate 7 made of cast iron and whose surface is coated with a refractory material, and has a hole 71 in the center that is smaller than the outlet 33 of the melting furnace 3 shown in FIG. A slit 72 penetrating the front and back sides is provided. As shown in FIG. 1, this straightening plate 7 is placed at the bottom of the melting furnace 3 via a support member 8 so as to be concentric with the outlet 33 of the furnace body 31.

In the above configuration, when the induction coil 32 is operated,
The waste material 2 is melted, and the molten metal flows through the holes 71 of the rectifying plate 7.
The water passes through the outlet 33 and flows out from the outlet 33.

Next, when the operation of the induction coil 32 is stopped, the molten metal remaining in the furnace body 31 adheres to the rectifying plate 7 and hardens.
The hole 71 is in a clogged state.

However, since the hole 71 is smaller in size than the outflow hole 33 and furthermore, the supporting member 8 is present, the molten metal does not come into contact with the outer wall of the outflow port 33, so that the outflow port 33 is not clogged. Next, when the induction coil 32 is operated again, the furnace body 31
At the same time as the waste material 2 inside is heated by induction, the rectifying plate 7
Since it is also made of cast iron, it is heated by induction. Since the amount of mass adhering to the rectifying plate 7 is much smaller than the waste material in the furnace body 31, the mass adhering to the rectifying plate 7 is melted before the waste material 2 is melted. Therefore, waste material 2
When the molten metal starts to be melted, the holes 71 of the rectifying plate 7 are no longer clogged, so the molten metal can smoothly flow out from the outflow holes 33. Further, the induced current flowing through the rectifying plate 7 is limited due to the presence of the slits 72, and since it is made of cast iron and coated with a refractory material, it does not become hotter than the temperature of the molten metal, so there is no fear of it melting.

1. Effects of the Invention] As explained above, the melting furnace of the present invention is provided with a ring-shaped rectifying plate made of metal at the bottom and having slits penetrating the front and back in the radial direction. It produces such excellent effects.

■The gold Xa rectifying plate is heated by induction by the action of the induction coil, and melts the lump formed at the bottom of the melting furnace before the waste material is melted, so when the waste material is being melted,
The outlet is never clogged, and the molten metal that has formed can flow 113 smoothly from the outlet at any time.

②The rectifier plate has slits that limit the induced current flowing through it, so it cannot be heated as much as necessary, and therefore melts.1. It never turns.

[Brief explanation of drawings]

Fig. 1 is a vertical side view showing an embodiment of the present invention, Fig. 2 is a plan view of the rectifying plate shown in Fig. 1, and Fig. 3 is a longitudinal side view of an instant melting apparatus using a conventional melting furnace. be. Figure 1 Figure 3 1 2 3 2 - Rectifier plate - Furnace body - Induction coil - Outlet - Slit

Claims (1)

[Claims] 1. A melting furnace comprising a hollow cylindrical furnace body with a bottom, an induction coil provided on the outer periphery of the furnace body, and an outlet opened in the bottom wall of the furnace body, A ring-shaped member made of a metal having a higher melting point than the metal to be melted in the melting furnace,
A melting furnace characterized in that a rectifying plate having a slit extending through the front and back in the radial direction is arranged at the bottom of the furnace body so as to be concentric with the outlet. 2. The melting furnace according to claim 1, wherein the straightening plate is made of cast iron and has a surface coated with a refractory material. 3. The melting furnace according to claim 1 or 2, wherein the inner diameter of the straightening plate is smaller than the diameter of the outlet.