JPH0883676A - Induction heating dezincing device - Google Patents

Abstract

(57) [Summary] [Purpose] By removing zinc and then melting it, it is possible to prevent deterioration of the cast iron material and casting defects to produce high-quality cast products, and to extend the life of the induction furnace lining. ,
By maintaining a clean working environment and easily securing workers, it is possible to reuse the inexpensive and easily available galvanized steel sheets that are widely available in the market. [Structure] A heating coil 4 connected to an induction heating power source is wound around an outer periphery of a heating cylinder 3 which is opened in the vertical direction, and an upper portion of the heating cylinder 3 serves as a material inlet 5 and an exhaust duct 6 is provided in the vicinity thereof. A bottom lid that can be installed and opened and closed under the heating tube 3
Is provided as a material discharge port 9 and a dezincified steel plate 12a from which zinc has been removed in the heating cylinder 3 is supplied to the induction melting furnace 2 below this, and a carrier 15 having a large number of zinc grain dropping ports formed at the bottom. It is characterized by being provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating type dezincing device for removing zinc from a galvanized steel sheet and charging it into an induction furnace.

[0002]

2. Description of the Related Art Generally, in the case of remelting a galvanized steel sheet to produce cast iron or the like, conventionally, zinc was not removed but was melted without treatment. An acid refractory material (main component is SiO ₂ ) is used as the refractory material forming the melting chamber of the induction furnace for melting the galvanized steel sheet. Therefore, if the galvanized steel sheet is melted without treatment, zinc reacts with the refractory material on the furnace wall to form a low-melting material, which causes a problem of significantly shortening the life of the refractory material. Also, since zinc has a low melting point and easily evaporates, there is a risk that zinc vapor will penetrate into the lining layer of the melting chamber and destroy the lining layer, resulting in short circuit between the coil layers due to contact with the heating coil. There is a risk that the cooling water flowing through the tank may leak and cause a steam explosion.

Even if a hot water leak detection sensor is installed inside the lining layer of the melting chamber to prevent such an accident, zinc will come into contact with this sensor and cause a short circuit with the ground, causing malfunction. It is easy to occur and cannot reliably prevent accidents. The presence of zinc in the molten metal may cause deterioration of the material quality of the molten metal and casting defects.

Further, zinc has a low boiling point and is easily vaporized, and moreover, it is easily oxidized, so that white smoke of zinc oxide (ZnO) is trapped during the melting work and the working environment is significantly deteriorated. Under such environmental conditions, it is important to manage the health of workers, and it is difficult to secure workers. Due to such many problems, galvanized steel sheets have not been used much even though they are widely available on the market and can be obtained at low cost.

[0005]

The present invention eliminates the cause of shortening the life of the refractory material in the melting chamber, prevents the deterioration of cast iron material and casting defects, and is capable of producing high-quality cast products.
Induction heating that extends the life of the induction furnace lining, maintains a clean working environment and easily secures workers, and enables reuse of inexpensive and easily available galvanized steel sheets that are widely available in the market. The present invention provides a dezincing device.

[0006]

In the induction heating type dezincification apparatus according to claim 1 of the present invention, a heating coil connected to an induction heating power source is wound around the outer periphery of a heating cylinder opened in the vertical direction, and The upper part of the heating cylinder is used as a material input port, an exhaust duct is attached in the vicinity of this, and an openable / closable bottom lid is provided at the lower part of the heating cylinder as a material discharge port. Below this, the material from which zinc has been removed in the heating cylinder. Is provided to the induction melting furnace, and a carrier or shooter having a large number of zinc grain drop openings formed at the bottom is provided.

Further, in the induction heating type dezincification apparatus according to a second aspect of the present invention, a heating cylinder having one opening as a material inlet and the other opening as a material outlet is laterally arranged and rotatably supported. Then, a heating coil connected to an induction heating power source is wound on the outside of the heating cylinder, and an exhaust duct is provided on the end side of the heating cylinder to remove the desorption between the material discharge port and the induction melting furnace. The invention is characterized in that a zinc steel sheet is supplied to the induction melting furnace and a separation shooter for separating zinc particles is provided.

[0008]

In the induction heating type dezincing apparatus according to the first aspect of the present invention, the galvanized steel sheet is put into the heating cylinder through the material charging port of the induction heating type dezincing apparatus so that the induction heating power source changes the heating coil. When the galvanized steel sheet is induction-heated by energizing, the zinc plated on the surface of the steel plate is melted and flows downward and becomes granular. A part of the molten zinc is oxidized to generate white zinc white, which is exhausted to the outside from the material discharge port provided near the material input port.

When the zinc plating on the surface of the steel plate is removed, the bottom lid of the induction heating dezincification device is opened, and the dezinced steel plate and zinc particles are discharged from the material discharge port and dropped onto a carrier or shooter provided below. Due to the impact at this time, the fine zinc particles pass through the zinc particle drop opening at the bottom of the carrier or shooter and are collected in the lower collection box. The dezinced steel sheet is conveyed to a position above the induction melting furnace by a carrier or a shooter and put into the melting chamber, where the dezinced steel sheet is induction-heated by a heating coil to produce a metal melt.

Further, in the induction heating dezincing apparatus according to the second aspect, when the galvanized steel sheet is charged into the inside through the material charging port of the rotating heating cylinder, the galvanized steel sheet moves forward,
Induction heating is performed by a heating coil provided on the outside of the heating cylinder, and the zinc plated on the surface of the steel plate is melted and flows downward and becomes granular. Part of the melted zinc is oxidized to generate zinc white in the heating cylinder, but the zinc white inside is exhausted from the exhaust duct provided at the end of the heating cylinder.

When the zinc plating on the surface of the galvanized steel sheet is continuously removed, the dezincified steel sheet is sequentially discharged from the material discharge port of the heating cylinder, slipping on the separation shooter, fine zinc particles pass through the mesh and move downward. Then, only the dezinced steel sheet is supplied to the induction melting furnace.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIG. In the figure, 1 is an induction heating type dezincing device, 2
Is an induction melting furnace provided on the lower side of this. The induction heating type dezincification device 1 includes a heating cylinder 3 which is opened in the vertical direction.
A heating coil 4 is wound around the outer periphery of the heating coil 4, and the heating coil 4 is connected to an induction heating power source (not shown). The heating cylinder 3 has an upper portion serving as a material inlet 5, an exhaust duct 6 is attached in the vicinity thereof, and a lid 7 is attached to the upper portion so as to be openable and closable. Further, the lower part of the heating cylinder 3 is the material discharge port 9
The bottom lid 11 is attached to the cylinder 10 by the cylinder 10 so that the bottom lid 11 can be opened and closed. A lift magnet 13 for attracting and transporting the galvanized steel sheet 12 is provided above the induction heating dezincification apparatus 1.

Below the induction heating type dezincification apparatus 1,
A carrier 15 formed in a cage shape by a wire net is provided, and is moved to a position above the induction melting furnace 2 by a moving mechanism (not shown). This carrier 15 comprises a cylindrical container body 16 made of wire mesh and a bottom lid made of wire mesh on the bottom of the container body 16.
17 is attached so that it can be opened and closed freely, and the mesh of the wire mesh serves as a zinc grain drop opening. A collection box 20 for the zinc particles 19 is installed below the carrier 15 under the induction heating type dezincification apparatus 1.
Further, in the induction melting furnace 2, a heating coil 22 is wound around an outer periphery of a melting chamber 21 made of a refractory material and formed in a crucible shape, and the molten metal melt 23 is tilted and discharged.

In the apparatus having the above structure, first, the upper lid 7 of the induction heating type dezincing apparatus 1 is opened and the bottom lid 11 is closed, and the galvanized steel sheet 12 adsorbed by the lift magnet 13 is conveyed to the material feeding port 5 From the inside into the heating cylinder 3.
After that, when the heating coil 4 is energized from an induction heating power source (not shown) with the upper lid 7 closed, the galvanized steel sheet 12 is
Induction heating at 700-900 ℃ melts the zinc that was plated on the surface of the steel plate, and then flows downward and becomes granular. Further, although zinc that has been partially heated is oxidized and zinc white is generated in the heating cylinder 3, a blower (not shown) is operated to exhaust the zinc white inside from the exhaust duct 6 above the heating cylinder 3. Therefore, zinc white can be prevented from diffusing into the work environment.

After the zinc plating on the surface of the galvanized steel sheet 12 is removed, the cylinder 10 is operated to open the bottom lid 11,
The dezincified steel plate 12a and the zinc particles 19 inside are discharged from the material discharge port 9 and put into a basket-shaped carrier 15 provided below. At this time, due to the impact of dropping, the fine zinc particles 19 pass through the mesh of the wire mesh and are collected in the collection box 20 below. After that, the bottom lid 11 is closed and the galvanized steel plate 12 is put into the induction heating type dezincification apparatus 1 to perform induction heating.

On the other hand, the basket-shaped carrier 15 containing the dezinced steel plate 12a is conveyed to the upper side of the induction melting furnace 2 by a moving mechanism (not shown), where the bottom lid 17 is opened and the dezinced steel plate 12a is melted in the melting chamber 21. It is thrown in. Here, the dezincified steel sheet 12a is induction-heated by the heating coil 22 of the induction melting furnace 2 to produce the molten metal 23. In this case, the dezincified steel sheet 12a is heated in the dezincification step of the induction heating type dezincification apparatus 1 and is charged into the induction melting furnace 2 in a preheated state, so that power consumption can be reduced. Further, since the molten metal 23 melts the dezinced steel sheet 12a, zinc vapor is not generated even when melted at high temperature, and there is no reaction between zinc and the furnace wall refractory material in the melting chamber 21 to shorten the life of the refractory material. An interlayer short circuit of the heating coil 22 can be prevented. Further, since zinc is not present in the molten metal 23, it is possible to reduce the cause of the cast iron material deterioration and casting defects.

FIG. 2 shows another embodiment of the present invention.
Between the lower part of the induction heating type dezincification apparatus 1 and the upper part of the induction melting furnace 2, a shooter 24 having a bottom made of a wire net is installed so as to be inclined, and the zinc particles 19 are collected below the shooter 24. A collection box 20 is provided.

In the above apparatus, the galvanized steel sheet 12 is induction-heated by the induction heating type dezincification apparatus 1, and when the zinc plated on the surface of the steel plate is removed, the cylinder 10 is operated to open the bottom lid 11. , Dezincified steel sheet 12 from the material discharge port 9
The a and the zinc particles 19 are discharged and dropped on a shooter 24 provided below. The dezincified steel sheet 12a and the zinc particles 19 slide on the inclined shooter 24, the fine zinc particles 19 pass through the mesh of the wire mesh and are collected in the lower collection box 20, and only the dezinced steel sheet 12a is heated in the induction melting furnace 2 Is automatically turned on.

FIG. 3 shows another embodiment of the present invention.
A heating cylinder 26, which is made of a non-magnetic material such as stainless steel and has a cylindrical shape with both ends opened, is arranged so as to be inclined in the lateral direction, and a rotary ring 27 is attached to the opening end on the upper side of the heating cylinder 26.
At the same time, a ring-shaped gear 28 is attached to the opening end on the lower side to serve as the material discharge port 9. The rotating ring 27 and the ring gear 28 at both ends are rotatably supported by bearings 29 and 9, and a spiral feed fin 30 is attached to the inner wall surface of the heating cylinder 26.

A rotating roller 31 for supporting the rotating ring 27 is provided below the rotating ring 27, and a drive motor 33 having a gear 32 meshing therewith is provided below the ring gear 28. The heating cylinder 26 is rotated by the rotation of the drive motor 33. A heating coil 4 in which a water-cooled copper tube is spirally wound is provided outside the heating cylinder 26, and the heating coil 4 is connected to an induction heating power source (not shown). A ring-shaped exhaust duct 6 is provided next to the material inlet 5.
Are attached to form the induction heating type dezincification apparatus 1.

A belt conveyor 34 for supplying the galvanized steel plate 12 to the heating cylinder 26 is provided beside the material inlet 5 of the induction heating type dezincification apparatus 1. A separation shooter 24 formed of a wire mesh is provided beside the material discharge port 9 so that its tip is located above the induction melting furnace 2. A collection box 20 for the zinc particles 19 is installed below the separation shooter 24. Further, in the induction melting furnace 2, a heating coil 22 is wound around an outer periphery of a melting chamber 21 made of a refractory material and formed in a crucible shape, and the molten metal melt 23 is tilted and discharged.

In the apparatus having the above structure, first, the galvanized steel sheet 12 is conveyed by the belt conveyor 34 and is introduced into the inside from the material introduction port 5 of the carry-in induction heating type dezincification apparatus 1. Further, the drive motor 33 is driven to rotate the small diameter gear 32 attached thereto and the large diameter ring-shaped gear 28 meshing with the small gear 32 to rotate the heating cylinder 26. Since the spiral feed fin 30 is attached to the inner wall surface of the heating cylinder 26,
The rotation of 30 causes the galvanized steel plate 12 inside to slowly advance.

On the other hand, when the heating coil 4 provided outside the heating cylinder 26 is energized from an induction heating power source (not shown), the galvanized steel plate 12 in the heating cylinder 26 is induction-heated, and the zinc plated on the surface of the steel plate is zinc-plated. Melts and flows downward into granules. Further, zinc that has been partially heated is oxidized to generate zinc white in the heating cylinder 26, but a blower (not shown) is operated to remove zinc white from the exhaust duct 6 provided on the inclined upper side of the heating cylinder 26. Exhausted.

When the zinc plating on the surface of the galvanized steel sheet 12 is removed, the dezincified steel sheet 12a is sequentially discharged from the material discharge port 9 of the heating cylinder 26, slipped on the separation shooter 24, and sent to the induction melting furnace 2. At this time, the fine zinc particles 19 pass through the mesh of the wire mesh and are collected in the lower collection box 20, and only the dezincified steel sheet 12a is supplied to the induction melting furnace 2.

FIG. 4 shows another embodiment of the present invention, in which the separation shooter 24 provided between the induction heating type dezincing apparatus 1 and the induction melting furnace 2 is formed into a cylindrical basket shape with a wire mesh. Then, the one end on the intrusion side is connected to the side surface of the ring-shaped gear 28, and the rotation ring 27 is attached to the discharge side and supported by the rotation roller 31 to rotate integrally with the heating cylinder 26, and the dezincified steel plate The zinc particles 19 are separated while rotating the 12a and are continuously supplied to the induction melting furnace 2.

The induction heating dezincing apparatus 1 and the induction melting furnace 2 may be operated by switching the power sources using the same power source, or may be operated by independent power sources. Further, although the carrier 15 and the separation shooter 24 are shown as being formed of wire mesh, other structures may be used as long as a large number of zinc grain drop openings such as punching metal and lath material are formed. Although the case where the spiral feed fin 30 is attached to the inner wall surface of the heating cylinder 26 is shown, it may not be attached if the inclination angle is large. If a vibrator is attached to the separation shooter 24, the dezinced steel sheet 12a can be separated more efficiently.

Further, the case where the belt conveyor 34 is used as a device for supplying the galvanized steel sheet 12 to the induction heating type dezincification device 1 has been described, but a structure for supplying from the hopper may be used. Further, the exhaust duct 6 is the material inlet 5 of the heating cylinder 26.
Although the case where it is attached to the side is shown, it may be provided on the material discharge port 9 side.

[0028]

As described above, according to the induction heating type dezincification apparatus according to the present invention, since zinc in the galvanized steel sheet is removed in the heating apparatus and then melted in the induction melting furnace, white smoke of zinc oxide is produced. Will not diffuse and the working environment will be good, and the melting energy can be reduced by melting the preheated steel sheet, and also the fireproof lining of the melting chamber and the damage to the heating coil due to zinc permeation will be prevented, resulting in a high-quality cast product. Obtainable. Further, workability can be improved in an apparatus in which zinc is continuously removed and the dezincified steel sheet is continuously supplied to the induction melting furnace.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an induction heating dezincing apparatus and an induction melting furnace according to an embodiment of the present invention.

FIG. 2 is a sectional view showing an induction heating type dezincing apparatus and an induction melting furnace according to another embodiment of the present invention.

FIG. 3 is a sectional view showing a continuous induction heating type dezincing apparatus and an induction melting furnace according to another embodiment of the present invention.

FIG. 4 is a sectional view showing a continuous induction heating dezincing apparatus and an induction melting furnace according to another embodiment of the present invention.

[Description of sign]

 1 Induction heating dezincing device 2 Induction melting furnace 3 Heating cylinder 4 Heating coil 5 Material inlet 6 Exhaust duct 7 Upper lid 9 Material outlet 11 Bottom lid 12 Galvanized steel sheet 12a Dezinced steel sheet 13 Lift magnet 15 Carrier 16 Container body 17 Bottom lid 19 Zinc particles 20 Collection box 21 Melting chamber 22 Heating coil 23 Metal melt 24 Shooter 26 Heating cylinder 27 Rotating ring 30 Spiral feeding fin 33 Drive motor 34 Belt conveyor

Claims (2)

[Claims] 1. A heating coil connected to an induction heating power source is wound around an outer periphery of a heating cylinder opened in the up-down direction, and an upper portion of the heating cylinder serves as a material inlet and an exhaust duct is attached in the vicinity of the heating port for heating. A bottom lid that can be opened and closed at the bottom of the cylinder is used as a material discharge port, and below this, the material from which zinc has been removed in the heating cylinder is supplied to the induction melting furnace. An induction heating type dezincification device characterized by being provided with a tool or a shooter. 2. A heating cylinder having one opening as a material inlet and the other opening as a material outlet is laterally arranged and rotatably supported, and an induction heating power source is provided outside the heating cylinder. While winding the heating coil connected to, the exhaust duct is provided on the end side of the heating cylinder, between the material discharge port and the induction melting furnace, the dezinced steel sheet is supplied to the induction melting furnace and the zinc particles are An induction heating type dezincification device, characterized in that a separation shooter for separating the above is provided.