JP3008331U - Foreign matter removal device in snout - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a foreign matter removing device for the bath surface in the snout installed in the plating bath. [Constitution] One end of a U-shaped pipe-like foreign matter introduction cylinder having a suction port on the plating bath surface portion inside the snout to let a part of the diagonally cut cut out on the bath surface and suck dross on the bath surface A device for removing foreign matter in a snout, characterized in that a screw in a bath for discharging a bath metal containing dross to the outside of the snout from a discharge port formed on a side wall of the other end of the introducing cylinder is provided in the other end of the introducing cylinder. [Effect] The time until replacement of the immersion member in the plating bath is extended, and it becomes possible to manufacture a high-quality plated steel sheet that does not contain scratches or foreign matter.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an iron-making machine, and more particularly to a device for removing foreign matter from a bath surface inside a snout, which is installed in a plating bath for continuous hot dip zinc-aluminum alloy plating of thin steel plates, hot dip aluminum plating and the like.

[0002]

[Prior art]

 Conventionally, the plating equipment used in continuous hot dip zinc-aluminum alloy plating of thin steel sheets and hot-dip aluminum plating line is provided with a cylindrical snout shown at 4 in Fig. 1 to oxidize the steel sheet to be plated. It has a structure to prevent pollution.

Usually, the upper part of the snout is connected to a reduction annealing furnace, and the other end is immersed in a plating bath, so that the inside of the snout is always filled with a reducing gas as in the reduction annealing furnace. There is. Therefore, if there is no scum on the surface of the plating bath or dropping of filth, the metal plate should be completely metal-plated without scratches or foreign matter.

[0004]

[Problems to be solved by the device]

 However, in the actual continuous steel plate plating, it is difficult to obtain a plated steel plate having excellent surface properties due to the inclusion of foreign matter in the plating layer. This is because the inner surface of the snout is heat-insulated and protected by a heat-resistant member, and due to vibration of the equipment, fine powder of the heat-resistant member drops and deposits on the plating bath surface, and scum on the plating bath surface that comes into contact with the atmosphere is mixed. The reason is that it floats above the plating bath inside the snout.

In order to improve these, a method of sucking impurities on the metal bath surface in the snout together with the molten metal by an electromagnetic pump and discharging it out of the snout (Japanese Patent Laid-Open No. 60-230969), or a sub-snout. A suspension is provided by a method of scraping and removing the metal ash by a screw type transfer means (Japanese Patent Laid-Open No. 61-149467), or a suspended pipe held below the bath surface of the plating bath in the snout. For removing dross to the outside of the snout (Japanese Utility Model Laid-Open No. 3-92764), and a device for removing dross by using a cylindrical member provided in the snout with a spiral groove for supporting and rotating in a cylinder in contact with the plating bath surface ( A number of improvement measures have been proposed, such as JP-A-62-188766).

In all of the above proposals, since the apparatus is immersed in a high-temperature plating bath, the suction impeller / introduction pipe, etc. are damaged in a short period of time due to corrosion due to molten metal or high-temperature wear, and replacement is required. There was a problem that the operation efficiency was poor and that the metal ash in the snout could not be sucked and removed well. It is an object of the present invention to solve the above-mentioned problems of the prior art and to provide a foreign matter removing device for a bath surface inside a snout which is installed in a molten metal plating bath which is easy to operate and has high efficiency.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the inventors of the present invention have conducted various studies, and as a result, the suction port of the foreign matter introducing cylinder for sucking the metal ash floating in the snout is cut to be inclined with respect to the bath surface. We have found that it is possible to easily suck in metallic ash, and have completed the present invention. That is, the present invention made on the basis of the above-mentioned findings has a U-shaped structure having a suction port at the plating bath surface portion in the snout, which is provided with a part of an obliquely cut end on the bath surface for inhaling metal ash on the bath surface. One end of a mold pipe-shaped foreign matter introduction cylinder is provided, and a bath screw for discharging the bath metal containing metal ash to the outside of the snout from the discharge port formed on the other end side wall of the introduction cylinder is provided in the other end of the introduction cylinder. The outline is a device for removing foreign matter in a snout, which is characterized by

In addition, in a snout in which a sprayed coating layer of a molten metal corrosion-resistant material is formed on the surface of a portion such as the suction port of the foreign matter introduction cylinder, the conduit portion, the screw, the screw shaft, and the discharge port that is immersed in the metal bath. A foreign matter removing device is also the subject of the present invention. Further, a foreign matter removing device in a snout, in which a portion of the U-shaped pipe-shaped foreign matter introducing cylinder immersed in the plating bath and a portion for holding the bath driving portion are connected by a split detachable connecting portion, is also a gist of the present invention. .

[0009]

[Constitution and embodiment of the invention]

 The structure and operation of the present invention will be described. The present invention is to continuously pass the strip steel sheet 1 for plating into the molten metal bath 2 and deposit the plating metal on the surface thereof. The scum, foreign matter, etc. from above the plating bath surface 4 in the snout 5 of the continuous molten metal bath plating apparatus. It is a device for removing.

In the present invention, the screw 8 mounted by the drive shaft 10 in the foreign matter introducing cylinder 7 is rotated by the rotational force from the driving unit through the detachable connecting portion 12, and the suction port of the foreign matter introducing cylinder 7 is rotated. The foreign matter on the plating bath surface 4 in the snout 5 is sucked from 6 and is discharged to the outside of the snout from the discharge port 11 opened in the metal bath.

According to the present invention, the intake port 6 of the foreign matter introducing cylinder 7 is inclined with respect to the central axis of the foreign matter introducing cylinder 7 in order to easily capture scum, foreign matter and the like from the plating bath surface 4 in the snout 5. It is characterized in that the opening area of the suction port 6 is enlarged to ensure the suction of the metal ash and the circulation amount of the molten metal is reduced.

Further, in the present invention, the foreign matter introduction cylinder 7 is U-shaped, and the screw 8 attached to the opposite side of the suction port 6 is driven from above the metal bath surface. Then, the scum removed from the plating bath surface 4 inside the snout 5 and the foreign matter are merged with the scum outside the snout 5.

Further, the portion to be immersed in the plating bath is coated with a material having corrosion resistance on the molten metal by thermal spraying or the like to prevent erosion by the plated metal and to extend the life of each member. The parts 7, 8 and 10 immersed in the plating metal bath and the driving part 9 outside the bath can be detached by the connecting part 12, which facilitates the exchange of parts.

[0014]

[Effect of device]

 Since the present invention is configured as described above, the time until replacement of the immersion member in the plating bath is doubled or longer, and a high-quality plated steel sheet that does not contain scratches or foreign matter is provided. It becomes manufacturable, has great industrial value, and is extremely useful in industry.

[Submission date] October 5, 1994

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

[Prior art]

Conventionally, the plating equipment used in continuous hot dip zinc-aluminum alloy plating of thin steel sheets and hot-dip aluminum plating lines is provided with a cylindrical snout shown by 5 in Fig. 1 to oxidize the steel sheet to be plated. It has a structure to prevent pollution.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

Usually, the upper part of the snout is connected to a reduction annealing furnace and the other end is immersed in a plating bath, so that the inside of the snout is always filled with a reducing gas as in the reduction annealing furnace. There is. Accordingly, dross generation of the plating bath surface, if there is no dropping of foreign matter, should not including production and foreign substances wound against the steel plate molten metal plating is performed intact.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

[0004]

[Problems to be solved by the device]

However, in the actual continuous steel plate plating, it is difficult to obtain a plated steel plate having excellent surface properties due to the adhesion of foreign matter to the plating layer. This is because the inner surface of the snout is heat-insulated and protected by the heat-resistant member, and the fine powder of the heat-resistant member drops and deposits on the plating bath surface due to the vibration of the device, and dross generated by the reaction etc. on the plating bath in the snout. This is because it will surface.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

[0007]

[Means for Solving the Problems]

To achieve the above object, the present inventor and the like result of various studies, by a cut which is inclined to the suction port of the foreign matter introduction tube for sucking dross floating or the snout et against bath surface, dross We found that it was possible to easily inhale, and completed the present invention. That is, the present invention made on the basis of the above-mentioned findings has a U-shaped structure having a suction port on the plating bath surface portion in the snout, in which a part of an obliquely cut end is put on the bath surface to suck the dross on the bath surface. One end of a pipe-shaped foreign substance introduction cylinder was provided, and a bath screw for discharging the bath metal containing dross from the snout from the discharge port formed on the other end side wall of the introduction cylinder was provided in the other end of the introduction cylinder. The outline is a device for removing foreign matter in a snout, which is characterized by

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

In addition, in a snout in which a molten metal corrosion-resistant material is sprayed or a coating layer is formed on the surface of a portion of the foreign matter introducing cylinder such as the suction port, conduit portion, screw, screw shaft, and discharge port that is immersed in the metal bath. A foreign matter removing device is also the subject of the present invention. Further, a foreign matter removing device in a snout, in which a portion of the U-shaped pipe-shaped foreign matter introducing cylinder immersed in the plating bath and a portion for holding the bath driving portion are connected by a split detachable connecting portion, is also a gist of the present invention. .

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

[0009]

[Constitution and embodiment of the invention]

The structure and operation of the present invention will be described. The present invention is to continuously pass the strip steel plate 1 through the molten metal bath 2, and deposit the plating metal on the surface thereof. The dross , foreign matter, etc. from above the plating bath surface 4 in the snout 5 of the continuous molten metal bath plating apparatus. It is a device for removing.

[Procedure Amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

According to the present invention, the intake port 6 of the foreign matter introducing cylinder 7 is inclined with respect to the central axis of the foreign matter introducing cylinder 7 in order to easily capture dross , foreign matter and the like from the plating bath surface 4 in the snout 5. It is characterized in that the opening area of the suction port 6 is increased to ensure the suction of the dross and the circulation amount of the molten metal is reduced.

[Procedure Amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

Further, in the present invention, the foreign matter introduction cylinder 7 is U-shaped, and the screw 8 attached to the opposite side of the suction port 6 is driven from above the metal bath surface. Then, the dross and foreign matter removed from the plating bath surface 4 in the snout 5 are merged with the dross outside the snout 5.

[Brief description of drawings]

FIG. 1 is an explanatory sectional view showing the outline of the present invention.

[Explanation of symbols]

 1 Plating strip steel plate 2 Molten metal bath 3 Floating scum 4 Snout inner plating bath surface 5 Snout 6 Suction port 7 Foreign matter introduction cylinder 8 Screw 9 Screw drive unit 10 Screw drive shaft 11 Discharge port 12 Connection part

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[Procedure amendment]

[Submission date] October 5, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 2

[Correction method] Change

[Correction content]

2. A thermal spraying or coating layer of a molten metal corrosion-resistant material on the surface of a portion of the foreign matter introducing cylinder such as the inlet, conduit, screw, screw shaft, outlet, etc., which is immersed in the metal bath. The device for removing foreign matter in a snout according to claim 1, which is formed.

[Procedure amendment]

[Submission date] October 5, 1994

[Procedure Amendment 11]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 2

[Correction method] Added

[Correction content]

FIG. 2 is a plan view showing the arrangement of a snout and a snout pump in the device of the present invention.

[Procedure Amendment 12]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 3

[Correction method] Added

[Correction content]

FIG. 3 is a perspective view of a screw attached to a snout pump in the device of the present invention.

[Procedure Amendment 13]

[Document name to be amended] Statement

[Correction target item name] Explanation of code

[Correction method] Change

[Correction content]

[Explanation of symbols] 1 Steel strip for plating 2 Molten metal bath 3 Floating dross 4 Plating bath surface inside snout 5 Snout 6 Suction port 7 Foreign matter introduction cylinder 8 Screw 9 Screw driving part 10 Screw driving shaft 11 Discharging port 12 Connection part

[Procedure Amendment 14]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

[Procedure Amendment 15]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Added

[Correction content]

[Fig. 2]

[Procedure Amendment 16]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Added

[Correction content]

[Figure 3]

Claims (3)

[Scope of utility model registration request] 1. A U-shaped pipe-shaped foreign matter introduction tube having a suction port on the surface of the plating bath in the snout, where a part of the diagonally cut end is exposed on the bath surface to suck the metal ash on the bath surface. Inside the snout, which is provided with one end, and provided in the other end of the introduction cylinder is a screw in the bath for discharging the bath metal containing metal ash to the outside of the snout from the discharge port formed on the side wall of the other end of the introduction cylinder. Foreign matter removing device. 2. A sprayed coating layer made of a molten metal corrosion resistant material is formed on the surface of a portion of the foreign matter introducing cylinder such as an inlet, a conduit, a screw, a screw shaft, and an outlet which is immersed in a metal bath. The foreign matter removing device in the snout described. 3. The device for removing foreign matter in a snout according to claim 1, wherein the portion of the foreign matter introducing cylinder immersed in the bath and the portion for holding the bath driving portion are connected by a split detachable connecting portion.