JP2903449B2 - Induction heating alloying furnace in hot-dip galvanizing equipment. - 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 heating alloying furnace for heating a steel sheet immediately after hot-dip galvanizing and alloying a galvanized layer.

[0002]

2. Description of the Related Art Heating a steel sheet immediately after galvanizing,
Apparatus for alloying galvanized layer is disclosed in
An induction heating type alloying furnace as disclosed in Japanese Patent No. 503019 is known. In a hot dip galvanizing facility equipped with such an induction heating alloying furnace, zinc dust generated from the hot dip galvanizing apparatus rises with the rising airflow and adheres to the induction heating alloying furnace installed above. Conventionally, since these zinc dust generated from the hot-dip galvanizing apparatus is non-conductive, the induction heating coil and the bus bar for power supply between the induction heating coil and the power supply equipment and the like need not be particularly strictly electrically insulated, that is, Insulation treatment with an organic electric insulating material used for ordinary electric equipment alone could sufficiently cope with the adhesion of zinc dust, and did not cause any trouble in operation.

[0003]

However, with the recent development of hot-dip galvanizing technology, the physical properties of zinc dust generated from hot-dip galvanizing equipment have changed slightly, and zinc dust tends to be metallic and conductive. This causes the zinc dust to adhere to various members of the induction heating alloying furnace, thereby significantly reducing the ground insulation resistance. As a result, ground currents and stray currents flow, and the insulation of those current routes This causes a dielectric breakdown due to the carbonization of the steel, making it impossible to continue the operation.

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem, and an object of the present invention is to provide a structure capable of appropriately preventing zinc dust from adhering to a portion which may cause a short circuit or a decrease in ground insulation resistance. It is to provide a heating alloying furnace.

[0005]

Means for Solving the Problems To achieve such an object
The present invention for the induction heating alloying furnace has a plurality of
The induction heating coil device of the hot-dip galvanizing pot
In the induction heating alloying furnace located above,
The metallurgical furnace can be moved horizontally with respect to the steel sheet pass line.
By configuring, the entire furnace can be used when the alloying process is not in operation.
Be able to evacuate to the side of the pass line.
The thermal coil device can be opened and closed on the device main body and one end side
And the door to be opened.
Opens one end of the steel sheet passage in the induction heating coil device.
So that it is released and the main body of the device is closed
The main structure of the induction heating coil is
While arranging the coil components that make up the main part,
A coil that forms a part of the induction heating coil
Files, and close the door to the main unit.
In the state of being twisted, the coil constituent member in the device main body and the
The ends of the coil components in the door are
The knife switches exposed to the outside of the
Detachably connected via a solenoid-shaped induction heating core
So that the device body and the door are
On the contact surface, keep the door closed with respect to the main unit.
Heat-resistant packing to seal the knife switch is installed.
To prevent zinc dust from entering the main unit.
For supplying purge gas into the box structure
Hot-dip galvanizing characterized by providing gas supply means
It is an induction heating alloying furnace in equipment. Further, in the present invention as described above, limited and particularly preferable configurations are as follows.

(1) A water supply / drainage mechanism for supplying / draining water from / to a cooling water pipe for cooling an induction heating coil is housed in a box structure. (2) The induction heating coil device is supported on the furnace structure via an insulating member made of an inorganic material, or the induction heating coil device is supported on the furnace structure via an insulating material made of an organic material, and Gas blowing means for blowing gas to the insulating member is provided. (3) The power supply bus bar connecting the terminal of the induction heating coil and the power supply equipment is covered with an inorganic insulating material.

[0007]

According to the present invention, the induction heating alloying furnace of the present invention can be used for non-alloying.
During operation, the entire furnace can be evacuated to the side of the pass line.
In order to be able to do this, the induction heating coil
And a door, so that the door can be opened.
It is. Therefore, guidance is provided by opening this door.
Open one end of the steel sheet passage in the heating coil device,
Move the entire thermal alloying furnace horizontally with respect to the steel sheet pass line.
This allows the entire furnace to pass when the alloying process is not in operation.
It can be evacuated to the side of the in. Meanwhile, Solenoi
The coil components that should form the induction heating coil
It is provided on the main unit and the door, respectively,
When closed with respect to the main body,
Solenoid by being connected via knife switch
The induction heating coil is formed in the shape of a spiral. Induction as above
The heating coil device is connected to the main unit and the openable door.
The main body and the door are configured with coil components.
In the structure of providing an induction heating coil
The effect of preventing the adhesion of zinc dust is obtained as follows.
In other words, the main body of the device is
The main part of the induction heating coil in this box structure
Arrange the coil components to configure, and inside the door part
Also provide coil components that form part of the induction heating coil.
Of the zinc dust on the induction heating coil
Is prevented as much as possible.
Supply purge gas to the inside of the box to reduce the internal pressure of the box structure.
By slightly increasing the box structure from the structural constraints
Even if there is an unavoidable gap in the part,
Intrusion of zinc dust into the inside is more appropriately prevented. Further
In addition, the connection of both coil components in the main unit and the door
Is a knife exposed to the outside of the box structure and door
This is done via a switch, and the door is
When the knife switch is closed to the
As it is sealed with a gasket, zinc dust enters the inside of the device
Is more effectively prevented. The water supply and drainage mechanism that supplies and discharges water to and from the cooling water pipe for cooling the induction heating coil has a potential. Is prevented.

[0008] The induction heating coil device is supported by fixing the frame structure to a support portion on the furnace structure side via an insulating member. However, since the frame structure of the induction heating coil device has an electric potential, When zinc dust adheres to the insulating member, a ground current flows, and the insulating member made of an organic material causes dielectric breakdown due to carbonization. On the other hand, when the insulating member is made of an inorganic material, carbonization of the insulating member does not occur even when zinc dust adheres and a ground current flows. Further, even when the insulating member is made of an organic material, by spraying a gas from the gas blowing means to the insulating member, it is possible to prevent zinc dust from adhering and thereby generating a ground current. By covering the power supply busbar connecting the terminals of the induction heating coil with the power supply equipment with an inorganic insulating material, a short circuit due to the adhesion of zinc dust is prevented, and stray current flows due to the attached conductive dust. However, the coating is not carbonized and dielectric breakdown does not occur.

[0009]

1 to 6 show an embodiment of an induction heating alloying furnace according to the present invention. 1 and 2 are general views of an induction heating alloying furnace. An induction heating alloying furnace A includes a plurality of induction heating coil devices supported on a support base (not shown) at intervals in the vertical direction. 1, the steel sheet S guided upward from the molten zinc pot B is heated by passing through the inside of each induction heating coil device 1.

An induction heating alloying furnace A including the induction heating coil device 1, a support base, a high frequency power supply (not shown), and the like is installed on a horizontally movable trolley (not shown),
By moving this bogie, the pass line of the steel sheet S is positioned in the center of the induction heating coil device 1 during the alloying process operation, and when the alloying process is unnecessary, the entire furnace is placed on the side of the pass line. To be able to evacuate to the side. In order to enable such movement of the induction heating alloying furnace A with respect to the pass line without cutting the steel sheet S, a door portion 3 is provided at one end of each induction heating coil device 1 so as to be openable and closable. The steel plate can be moved in and out of the induction heating coil device 1 by opening the door portion 3 with respect to the device main body portion 2 and moving the entire furnace in a horizontal direction by a cart.

FIG. 3 to FIG. 6 show the structure of one induction heating coil device 1. As described above, the induction heating coil device 1 is composed of the device main body 2 which is a fixed side and the door portion 3 which is attached to the device main body so as to be openable and closable. On the other hand, in the closed state, a solenoid-shaped induction heating coil surrounding the pass line is formed, and the inside of this coil becomes the steel plate passing portion X.

The apparatus main body 2 has a frame structure 5 for supporting a coil. Inside the frame structure 5, for example, three sets of coils 4 (coil constituent members) are supported via insulators 6. The three sets of coils 4 are provided in parallel inside the framework structure 5 at intervals in the vertical direction. The end of each coil 4 on the door portion 3 side is open, and each open coil end is provided with a knife switch meshing portion 7a for connecting to a coil component on the door portion side. The knife switch meshing portion 7a is supported by the frame structure 5 via an insulator 8. Each coil 4 is insulated (not shown) in all charged parts except for the knife switch meshing part 7a. A cooling water pipe 9 is attached to the outer periphery of each coil 4.

A sealing panel 10 is attached to the outside of the frame structure 5, and the sealing panel 10 covers the entire coil 4 and the frame structure 5 so as to expose only the knife switch meshing portion 7a. Further, a refractory material 11 is provided inside the coil 4 except for the open end side (door portion side), and the upper end and the lower end of the refractory material 11 are interposed via the frame structure 5 as shown in FIG. It is connected to the upper end side and the lower end side of the sealed panel 10. Therefore, the coil 4 has a structure that is substantially sealed in a box structure 12 formed by the closed panel 10 and the refractory material 11. The refractory 11 is made of, for example, a ceramic fiber board.

In FIG. 3, reference numeral 15 denotes a cooling water inlet for supplying / draining water to / from the cooling water pipe 9, and 14 denotes a cooling water manifold.
In order to simplify the structure, the cooling water manifold 14 penetrates the closed panel 10 to supply and drain water. The cooling water manifold 1
4 and each cooling water inlet 15 are connected by a cooling water hose (not shown). Since the cooling water port 13 has a potential, insulation processing (not shown) is performed with the cooling water hose connected.

The door portion 3 has a frame structure 50 for supporting the coil components, and three sets of the coil components 40 constituting a part of the coil are mounted on the frame structure 50 via the insulating support plate 13. Supported. Each coil component 4
A knife switch meshing portion 7b meshing with the knife switch meshing portion 7a on the apparatus main body 2 side is provided at both ends of 0. Also, each of the coil constituent members 40 is insulated (not shown) in the charged part except the knife switch meshing part 7b.
Have been.

The refractory material 1 is provided on the front surface of the coil component 40.
10 are provided. A sealing panel 100 is attached to the outside of the frame structure 50.
However, the entirety of the coil component 40 and the frame structure 50 is covered such that only the knife switch meshing portion 7b and the refractory material 110 are exposed. Further, a cooling water pipe 9 is attached to the outside of the coil component 40.
Reference numeral 150 denotes a cooling water outlet for supplying and discharging water to and from the cooling water pipe 9.
3 is connected to a cooling water hose 16 which is drawn out to the outside through a guide hole provided in the cooling water manifold 3 and communicates with a cooling water manifold 14 on the apparatus main body 2 side. Since the cooling water outlet 150 also has a potential, insulation processing (not shown) is performed in a state where the cooling water hose is connected, and an insulating material is filled in conductive holes around the cooling water hose. The door part 3 having the above-described structure includes the frame structure 5.
Is rotatably supported via a pivot 17 supported by bearings, and is opened and closed with respect to the apparatus body 2 by an opening / closing cylinder 18 attached to the side of the frame structure 5.

A heat-resistant packing is provided at a closed portion of the apparatus main body 2 by the door portion 3 to prevent dust from entering the box structure. FIG. 6 shows the details, and partially shows the seal structure at the portion A in FIG. First, the sealing panel 100 of the door facing the open end of the apparatus main body 2 has a convex panel 3a projecting obliquely in the direction of the apparatus main body. The panel 10 includes the convex panel 3
It has a concave panel portion 2a which is concavely inclined in parallel with a. The convex panel portion 3a on the door portion side is provided with a heat-resistant packing 19a that is continuous in a U-shape along three sides excluding one side on the knife switch meshing portion 7b side. At the end of the concave panel portion 2a, a ridge 20a which is pressed against the heat-resistant packing 19a is provided,
It prevents zinc dust from entering from outside the induction heating coil device. A heat-resistant packing 19b is provided above and below the knife switch meshing portion 7b on the door side, respectively.
The corresponding knife switch meshing portion 7 of the device main body 2
Protrusions 20b which are pressed into contact with the heat-resistant packing 19b are provided above and below a to prevent dust from entering from the steel plate passing portion X side inside the coil. In some cases,
It is also possible to adopt a configuration in which packing is provided on the whole of the convex panel portion 3a and the concave panel portion 2a.

With such a configuration, the knife switch meshing portions 7a and 7b are exposed to the outside when the door portion 3 is opened, but when the door portion 3 is closed, the knife switch meshing portions 7a and 7b are exposed by the packing of the contact surface. It will be completely sealed. In the induction heating coil device 1 as described above, when the door portion 3 is closed, the knife switch meshing portions 7a and 7b of the device main body 2 and the door portion 3 mesh with each other. A substantial induction heating coil is configured. And the closed panels 10 and 100, the refractory material 11,
A substantially complete hermetic structure is provided by 110 and the heat-resistant packings 19a and 19b.

Further, dust intrusion into the box structure portion 12, particularly dust from the gap 21 inevitably formed between the refractory material 11 inside the apparatus main body and the refractory material 110 at the door portion. In order to prevent intrusion, a gas supply port 22 is provided in the sealed panel 10, and a purge gas (air or the like) is supplied from the gas supply port 22 into the box structure portion 12 to apply a slight internal pressure. By applying the internal pressure to the inside of the box structure portion 12 in this manner, the purge gas is constantly blown out from the gap 21 to the steel sheet passing portion X side, thereby preventing zinc dust from entering.

On both sides of the upper end of the induction heating coil device 1, a support bracket 23 integral with the framework structure portion 5 is protruded, and the induction heating coil device 1 supports the support bracket 23 via a support insulating stand 24 to support the alloying furnace. By being fixed on the gantry 25, it is suspended and held. The support insulating base 24 is made of an inorganic material. Since the framework structure 5 has a potential, when zinc dust adheres to the support insulating base 24, a ground current flows through the support bracket 23 and the support insulating base 24. Since it is an inorganic material, there is no problem of dielectric breakdown due to carbonization as in an organic material.

The supporting insulating base 24 can be made of an organic material. However, in this case, if zinc dust adheres and the above-described ground current flows, dielectric breakdown due to carbonization occurs. As shown in FIG. 7, it is necessary to prevent the adhesion of zinc dust by providing an air nozzle 26 facing the insulating support 24 and blowing air to the insulating support 24. In the other drawings, reference numeral 27 denotes a terminal of the coil 4, and the terminal 27 is connected to a high-frequency power supply (not shown) by a power supply bus bar (not shown).

FIG. 8 shows an example of a preferred cross-sectional structure of the power supply bus bar. The power supply bus bar 28 has a structure in which an insulating material 29 is sandwiched in order to minimize reactance, and cooling water pipes 30 are provided on both sides thereof. Are arranged. Further, the entire surface including the cooling water pipe 30 is covered with an insulating material 31 in order to prevent a short circuit due to adhesion of zinc dust. When the insulating material 31 is made of an organic material, when a stray current flows due to conductive dust attached to the outer surface,
There is a possibility that the insulating material may be carbonized and dielectric breakdown may occur. Therefore, it is preferable that the insulating material is formed of an inorganic material. In the above-described embodiment, the entire furnace is horizontally movable with respect to the pass line, and the induction heating coil device is provided with a door capable of opening and closing the coil in order to enable this movement. The present invention can be applied to a stationary stationary induction heating alloying furnace having no door portion.

[0023]

According to the induction heating alloying furnace of the present invention described above, it is possible to properly prevent zinc dust from adhering to a portion that may cause a short circuit or a decrease in ground insulation resistance.
The alloying treatment operation by the induction heating alloying furnace can be stably performed for a long period of time.

[Brief description of the drawings]

FIG. 1 is an overall explanatory view showing one embodiment of an induction heating alloying furnace of the present invention together with a molten zinc pot.

FIG. 2 is a perspective view showing a plurality of induction heating coil devices constituting the induction heating alloying furnace of FIG. 1;

FIG. 3 is a horizontal sectional view of one induction heating coil device of FIG. 2;

FIG. 4 is a partially cutaway front view of the induction heating coil device shown in FIG. 3;

FIG. 5 is a sectional view taken along line VV in FIG. 4;

FIG. 6 is a partially enlarged cross-sectional view of a seal structure at a part A in FIG. 3;

FIG. 7 is an explanatory view showing another embodiment of the support portion of the induction heating coil device.

FIG. 8 is a cross-sectional view showing one embodiment of a power supply bus bar.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Induction heating coil device, 2 ... Device body part, 3 ... Door part, 4 ... Coil, 5 and 50 ... Frame structure part, 6 and 8 ... Insulators, 7a and 7b ... Knife switch meshing part, 9 ... Cooling water pipe Reference numerals: 10, 100: closed panel, 11, 110: refractory material, 12: box structure, 13: insulating support plate, 15,
150: cooling water outlet, 14: cooling water manifold, 16
... Cooling water hose, 18 ... Opening / closing cylinder, 19a, 19b
... heat-resistant packing, 20a, 20b ... ridge, 21 ... gap,
22 ... gas supply port, 23 ... support bracket, 24 ... support insulating stand, 25 ... support stand, 26 ... air nozzle, 27 ... terminal, 28 ... power supply bus bar, 29 ... insulating material, 30 ... cooling water pipe, 31 ... insulating material , 40: coil component, A: induction heating alloying furnace, X: steel plate passage

Continued on front page (72) Inventor Minoru Yamano 13-4 Nihonbashi Kodenmacho, Chuo-ku, Tokyo Japan Ajax Magnesermic Co., Ltd. (72) Inventor Koichi Otani 13-4 Nihonbashi Kodenmacho, Chuo-ku, Tokyo (72) Inventor Keiji Takagi 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (72) Inventor Naohiko Ide 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (72) Inventor Kozo Hirata 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (72) Inventor Toshiki Masuda 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (72) Inventor Noboru Taguchi 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (72) Inventor Akihiko Nakamura 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (72) Inventor Haruto Yuta Tokyo 1-1-2 Marunouchi, Chiyoda-ku Nippon Kokan Co., Ltd. (72) Inventor Nobuo Tamoto 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Inside Nippon Kokan Co., Ltd. (72) Inventor Yasuhiro Yuasa Marunouchi, Chiyoda-ku, Tokyo 1-2-1 Nippon Kokan Co., Ltd. (72) Inventor Toshinori Fujii 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Japan 1-2 (1) Inventor Etsunari Sone 1-1-1, Marunouchi, Chiyoda-ku, Tokyo No. 2 Inside Nippon Kokan Co., Ltd. (72) Inventor Toshio Kitagawa 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (72) Inventor Wendal A. Shaw Warren, Ohio, USA 44482 (56) References JP Hei 4-235267 (JP, A) Actually open Hei 3-76392 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) C23C 2/28 C23C 2/00

Claims (5)

(57) [Claims] A plurality of induction heating coil devices are provided in a vertical direction.
Induction heating arranged above a hot-dip galvanizing pot
In the alloying furnace, Set the induction heating alloying furnace horizontally with respect to the steel sheet pass line.
When the alloying process is not in operation by configuring it to be movable
So that the entire furnace can be evacuated to the side of the pass line, Each of the induction heating coil devices is connected to the device body and one end thereof.
And a door portion that can be opened and closed at the door.
The steel plate in the induction heating coil device
So that one end of the part is open, The main body of the apparatus has a closed box structure, and the box
Coil that constitutes the main part of the induction heating coil
And the inside of the door part
Arrange coil components that form part of the induction heating coil
Then, with the door closed with respect to the main body of the apparatus,
A coil component in the main body and a coil component in the door.
The ends of the component members are located between the box structure and the door.
Detachable connection via knife switch exposed to each outside
To form a solenoid-shaped induction heating coil.
Sea urchin, At the contact surface between the device body and the door,
Close the knife switch with the body closed.
And a heat-resistant packing for
Purge gas for preventing zinc dust intrusion into the box
That the gas supply means for supplying into the structure
Induction heating alloying in hot-dip galvanizing equipment
Furnace. 2. The induction heating alloying furnace in a hot dip galvanizing facility according to claim 1, wherein a water supply / drainage mechanism for supplying / draining cooling water to / from a cooling water pipe for cooling the induction heating coil is provided in the box structure. Wherein the induction heating coil apparatus according to claim 1 was supported on the furnace structure through an insulating member made of inorganic material between
Induction alloying furnace in galvanizing the other described 2. The wherein the induction heating coil device via the insulating member made of organic material is supported in the furnace structure, and, to claim 1 or 2 having a gas blowing device for performing blowing gas against the insulating member An induction heating alloying furnace in the hot-dip galvanizing equipment according to the above. 5. A feeder bus bar connecting terminal of the induction heating coil and the power supply equipment and coated with inorganic-based insulating material according
Item 6. An induction heating alloying furnace in the hot-dip galvanizing equipment according to item 1, 2, 3, or 4 .