JP3193814B2 - Induction furnace with material input device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction furnace having a material charging device, and more particularly to an induction furnace having an increased dust collecting function during operation.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 61-37543 is known as a conventional induction furnace having an increased dust collecting function during operation. The induction furnace disclosed in this document has a vertically movable lid provided inside a hollow annular ring hood provided at an opening above a crucible and connected to exhaust means. Then, when melting the metal, the lid is separated above the inlet of the ring hood, and when keeping the molten metal warm, the crucible is closed with the lid.

[0003]

According to the above-mentioned document,
Efficient exhaust is performed when melting a lot of dust such as soot and gas, and heat loss is reduced when keeping the temperature low with dust. However, there is no description about the input of the material, the above-mentioned interior opened a solid lid, conveyor, crane, bucket,
The material is fed by a material feeding device such as a shuta. For this reason, when the material falls or rushes into the molten metal, the dust scatters and contaminates the surrounding environment.

An object of the present invention is to provide an induction furnace equipped with a material charging device capable of efficiently collecting dust and the like during the entire operation of melting a metal, keeping the temperature of a molten metal, and charging a material.

[0005]

According to the present invention, there is provided an induction furnace provided with a material charging apparatus, comprising: an induction furnace having an induction coil and a yoke on the outer periphery of a crucible; a lid for opening and closing an opening above the crucible; A crucible dust collection pipe connected to the lid, a material input device movably approaching the opening and having a material storage container and a discharge port, a hood surrounding the discharge port and opening downward, and a hood connected to the hood. An input dust collection pipe, a switching valve having one port connected to the crucible dust collection pipe and the other port connectable to and separable from the input dust collection pipe, and an intake port connected to a common port of the switching valve. And a blower.

[0006]

[Function] When melting the metal or keeping the molten metal warm, keep the material charging device with the charging dust collection pipe and hood attached, close the crucible opening with the lid, and switch the switching valve to one port. Operate the blower. Then, dust generated from the crucible is collected by the blower via the lid, the crucible dust collection pipe, and the switching valve. When charging the material, open the crucible lid, move the material charging device with the charging dust collection pipe and hood, align the discharge port of the storage container with the opening of the crucible, and switch the charging dust collection pipe. Connect to the other port of the valve to switch and operate the blower. Then, dust accompanying the charging of the material is collected by the blower via the hood, the charging dust collection pipe, and the switching valve. For this reason, not only is dust collected not only at the time of melting and heat retention but also at the time of material input, but dust collection is performed by a common blower via a switching valve.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view at the time of melting or warming of an embodiment;
FIG. 2 is a perspective view when the material shown in FIG. 1 is charged. In the figure,
The induction furnace 1 is a known one, and includes a crucible 2 inside, an induction coil (not shown) on the outer periphery thereof, and a yoke. Induction furnace 1
The upper part is fixed to the lower surface of the deck 3, and the molten metal can be poured from the tap hole 2b of the opening 2a of the crucible 2 by tilting around the tilt shaft 4 by a tilt device (not shown). A ring hood 5 attached to the upper surface of the induction furnace 1, that is, the upper surface of the deck 3 and similar to that in the above-mentioned document, is connected to an air blower 7 via a pipe 5 a and a tilt joint 6, and is connected to a dust collector (not shown). Connected to. The axis of the tilt joint 6 is the tilt axis 4
Matches. The lid 8 on the upper surface of the ring hood 5 is
The opening / closing device 9 provided at the position (1) lifts up a little as indicated by a white arrow M1 and then moves and opens and closes. The lid 8 has an inverted cup shape, and is connected to a crucible dust collection pipe 10 having flexibility in the vertical direction. The switching valve 11 is rotated by the rotation of the valve plate 11p, so that a common port 11c is provided.
Can be selectively communicated with one port 11a or the other port 11b. One port 11a is connected to the crucible dust collection pipe 10 through a rotary joint 12, and the common port 11c is connected to the tilt joint 6 through a common pipe 13.
Connected to.

[0008] The material input device 20 and the hood 30 attached thereto will be described. Rail 21 and trolley 22
The material input device 20 that can move toward the crucible opening 2a of the deck 3 has a material storage container 23 and a discharge port 24 inside. The storage container 23 may have an inclined groove shape with an inverted trapezoidal cross section, may be a vibration conveyor by attaching a vibrator, or may be an ordinary conveyor. When the door 24a is provided at the discharge port 24, the amount of stored material can be increased. The hood 30 is attached to the material input device 20 so as to surround the outlet 24 and open downward. Crucible opening 2
It is preferable to provide an input port 30a that matches a. Food 30
A dust collecting pipe 31 is connected to the upper part of the housing to provide a flange 31a. The material input device 20 and the hood 30 are moved by the cart 22.
Move as indicated by white arrows M2 and M3, the flange 31a of the charging dust collection pipe 31 can be connected to the other port 11b of the switching valve 11, and the valve plate 11p of the switching valve 11 is turned. To move the common port 11c to the other port 1
1b. At this time, as described above, the lid 8 is moved and opened as indicated by the white arrow M1. The result is as shown in FIG.

According to such a structure, when melting the metal or keeping the temperature of the molten metal, the material charging device 20 equipped with the charging dust collecting pipe 31 and the hood 30 is kept on standby.
The opening 2a of the crucible 2 is closed with the lid 8, the switching valve 11 is switched to one port 11a, and the blower 7 is operated. Then, dust generated from the crucible 2 is collected by the blower 7 via the lid 8, the crucible dust collection pipe 10, and the switching valve 11. When charging the material, open the lid 8 of the crucible 2
The material charging device 20 provided with the charging dust collecting pipe 31 and the hood 30 is moved so that the discharge port 24 of the storage container 23 matches the opening 2 a of the crucible 2, and the charging dust collecting pipe 31 is connected to the other side of the switching valve 11. And the air blower 7 is operated by switching to the port 11b. Then, dust accompanying the charging of the material is collected by the blower 7 via the hood 30, the charging dust collection pipe 31, and the switching valve 11. For this reason,
In addition to melting and keeping heat, dust is collected not only at the time of material input, but also by a common blower 7 via a switching valve 11, so that the configuration of piping, blowers, and the like is simplified, and the induction furnace is simplified. This makes it easier to carry out the tasks involved.

When a gap for secondary air suction is provided on the lower surface of the lid 8, the crucible dust collection pipe 10 does not need to be flexible because the lid 8 only rotates. The same is true when the crucible dust collection pipe 10 is fitted in the gap in the radial direction. If the common pipe 13 has flexibility, the rotary joint 12 is not required. When the lid 8 is opened so as to face the crucible dust collection pipe 10 and the switching valve 11 integrally, the rotary joint 12 is not required, and the common pipe 13 may have flexibility. The ring hood 5 is not essential. The storage container 23 and the discharge port 24 of the material input device 20 are not limited to those shown in the drawings, and may be, for example, those in which the bottom of the container opens at the center. At this time, the hood has a form surrounding the container.

[0011]

According to the induction furnace equipped with the material charging device of the present invention, dust is collected not only during melting of the metal and during the heat retention of the molten metal, but also during the entire operation at the time of material charging, and the environment around the induction furnace is reduced. In addition to the effect of improving the dust collection, dust is collected by a common blower via a switching valve, the configuration of piping and blower etc. is simplified, work related to the induction furnace becomes easier, and safety is improved There is an effect that is.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of the present invention when melting or keeping warm.

FIG. 2 is a perspective view at the time of material input in FIG. 1;

[Explanation of symbols]

Reference Signs List 1 induction furnace 2 crucible 2a opening 2b tap hole 3 deck 4 tilting shaft 5 ring hood 6 tilting joint 7 blower 8 lid 9 opening and closing device 10 crucible dust collection pipe 11 switching valve 11a one port 11b other port 11c common port 12 rotation Joint 13 Common piping 20 Material input device 21 Rail 22 Truck 23 Storage container 24 Discharge port 24a Door 30 Hood 31 Input dust collection pipe

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F27D 17/00 105 F27B 14/00-14/20

Claims (1)

(57) [Claims] 1. An induction furnace having an induction coil and a yoke on the outer periphery of a crucible, a lid for opening and closing an upper opening of the crucible,
A crucible dust collection pipe connected to the lid, a material input device movably approaching the opening and having a material storage container and an outlet, a hood surrounding the outlet and opening downward, and a hood connected to the hood. Input dust collecting pipe, a switching valve having one port connected to the crucible dust collecting pipe and the other port being connectable to and separating from the input dust collecting pipe, and an intake air connected to a common port of the switching valve. An induction furnace equipped with a material charging device, comprising: