JPH08269661A - Top dross scraping device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a top dross scraping device that scrapes and collects top dross floating in a molten metal plating bath and scrapes it to the outside. [Structure] The scraper 50 is rotated in a state of being floated in the hot-dip galvanizing bath 12, and the top dross is scraped into the inside from the opening 62 while scraping the top dross by the projecting piece 64. The top dross that has been scraped inside is conveyed using the first screw 56 and the second screw 44, and collected on an external dross carriage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a top dross scraping device for scraping top dross floating in a molten metal plating bath containing molten zinc, molten aluminum, molten tin, molten copper, molten solder and the like.

[0002]

2. Description of the Related Art As one of the methods for galvanizing the surface of a strip (steel plate), generally, the strip is continuously dipped in a plating bath containing molten zinc as a main component.
The so-called hot dip galvanizing method is known. The hot-dip galvanizing bath contains aluminum as an additive and iron dissolved out from the strip, and these aluminum and iron become intermetallic compounds to generate particulate impurities called so-called dross. This dross is roughly classified into a top dross, which has a low specific gravity due to its high aluminum content and is suspended in the plating bath, and a bottom dross, which has a high specific gravity due to its high iron content and is heavy in the plating bath. . For this reason, in the plating bath, top dross exists in the upper part, molten metal exists in the middle part, and bottom dross exists in the lower part.

Since the quality of plating is significantly impaired when the dross increases in the plating bath, a technique for removing the dross from the plating bath has been conventionally proposed. As a technique for removing dross, a technique disclosed in Japanese Utility Model Laid-Open No. 50-128310 and a technique disclosed in Japanese Patent Laid-Open No. 63-219536 are known. Actual Kaisho 50-12831
In the technique disclosed in Japanese Patent Publication No. 0, top dross floating on the surface of a plating bath is supplied together with a plating solution from a dross inlet to an internal reaction part, and after mixing with a chemical to separate the plating bath and the top dross, The top dross is conveyed to the outside using a screw conveyor and removed. This technique requires some means to scrape top dross up to the dross inlet.

The technique disclosed in JP-A-63-219536 is such that molten zinc, which is a plating solution, is supplied to a centrifuge using a pump or the like, and the top dross having a low specific gravity and the melting having a high specific gravity are centrifugally separated. The top dross is removed by separating it into zinc and discharging the top dross from the discharge port provided in the upper part and discharging the molten zinc from the discharge port in the lower part. In this technique, as described above, the pump is used to supply the top dross together with the molten zinc to the separator.

As a technique for collecting top dross, the technique disclosed in Japanese Utility Model Laid-Open No. 4-2586 is known. This technique collects top dross by repeating the operation of immersing a frame body having a bottom wall and a side wall of which a part is low on the surface of the plating bath and then pulling it up. As another conventional technique for removing top dross, Japanese Patent Laid-Open No. 7-00
The technique disclosed in Japanese Patent No. 3413 has been proposed. This technology uses a centrifuge to separate top dross with a low specific gravity and bottom dross with a high specific gravity from molten zinc, and continuously discharges the top dross from an outlet provided at the upper part to melt molten zinc in the middle part. The top dross and the bottom dross are removed by continuously discharging the bottom dross from the lower discharge port. Also in this technique, a pump is used to supply the top dross together with the molten zinc to the separator.

As another technique for removing top dross, the technique disclosed in Japanese Patent Laid-Open No. 7-003414 has been proposed. This technique uses a centrifugal separator to separate bottom dross with a high specific gravity from molten zinc, and during the separation operation at a high rotation speed, the molten zinc is continuously discharged from the discharge port provided at the top and During the discharging operation at the rotational speed, the bottom dross is discharged from the lower discharge in batches to remove the top dross and the bottom dross. In this technique, a pump is used to supply top dross together with molten zinc to a separator.

[0007]

However, the above-mentioned conventional techniques have the following problems. Actual Kaisho 50-1283
In the technique disclosed in Japanese Patent Laid-Open No. 10, the top dross floating on the surface of the plating bath must be brought to the dross inlet using some scraping means or pumping means.

In the technique disclosed in Japanese Patent Laid-Open No. 63-219536, since the top dross is supplied together with the molten zinc to the separator using a pump, the dross must be collected at the suction port of the pump. In addition, the actual Kaihei 4-2585
In the technique for scraping off the top dross disclosed in Japanese Patent Publication No. 6, since the top dross is taken into the frame by immersing the frame, it is necessary to scrape a large mass of the top dross.

JP-A-7-003413 and JP-A-7-003413
In the prior art disclosed in Japanese Laid-Open Patent Publication No. 003414-, since the top dross is supplied together with the molten zinc to the separator using a pump, it is necessary to scrape the top dross into the suction port of the pump. As described above, in scraping the top dross from the plating bath, it is necessary to scrape the top dross together with the molten zinc into the suction port of the pump or scrape the top dross with a ladle or the like in the above-mentioned conventional technique. In addition, when the hardened top dross spreads on the surface of the plating bath, it is necessary to scrape and harden the hardened top dross.

In view of the above circumstances, an object of the present invention is to provide a top dross scraping device that scrapes and collects top dross floating in a molten metal plating bath and scrapes it to the outside.

[0011]

A top dross scraping device of the present invention for achieving the above object is a top dross scraping device for scraping out a top dross floating in a molten metal plating bath. An arm extending obliquely upward from the vicinity of the surface of the metal plating bath, and a frame having a supporting member for supporting the arm (2) A cylindrical inclined portion extending obliquely upward from the vicinity of the surface of the molten metal plating bath along the arm, And a first cylindrical body fixed to the arm, which has a cylindrical floating portion continuously extending from the lower end of the inclined portion to the surface of the molten metal plating bath (3) The upper end of the inclined portion (4) A rotating member connected to the drive shaft of the driving unit and inserted into the inclined portion, and a transmission member that transmits a rotational force is fixed to the lower end. (5) A first screw fixed to the shaft so as to spirally surround the outer peripheral surface of the shaft. (6) A plurality of openings formed in the outer peripheral surface of the shaft, projecting pieces protruding from the peripheral edge of the opening, And a second tubular body having a transmitting portion for transmitting the rotational force from the transmitting member, the end portion being rotatably inserted into the floating portion and rotating in a state of floating in the molten metal plating bath (7) A closed hollow buoyancy body fixed in a state of being inserted into the inside of the second tubular body (8) A first buoyancy body fixed to the buoyancy body in a state of spirally surrounding the outer peripheral surface of the buoyancy body. It is characterized by having two screws.

Here, it is preferable to provide a height adjuster for moving the support member in the vertical direction.

[0013]

In the top dross scraping device of the present invention, since the buoyant body is fixed while being inserted inside the second tubular body, the second tubular body floats in the molten metal plating bath. You can Further, the second tubular body has a transmission portion, and the rotational force of the shaft is transmitted to the transmission portion from the transmission member, so that the second tubular body is rotated by the driving machine. When the second tubular body rotates while floating in the molten metal plating bath, this second
The projecting pieces of the plurality of openings formed on the outer peripheral surface of the cylindrical body scrape off the top dross floating in the molten metal plating bath and collect it from the opening to the inside. The top dross scraped inside is conveyed by the second screw to the floating part of the first tubular body, and from this floating part, the shaft inserted in the inclined part and the second screw fixed to this shaft are transferred. Is transported by. The first tubular body is fixed to the arm of the frame, and the end of the second tubular body is the first tubular body.
Since it is rotatably inserted in the cylindrical body of No. 2, the second cylindrical body can be moved on the surface of the molten metal plating bath by moving the frame, and as a result, the top dross spreading on the surface of the molten metal plating bath is destroyed. While scraping, you can scrape it outside.

If a height adjuster for moving the support member in the vertical direction is provided, the second tubular body can be moved up and down by moving the support member in the vertical direction with this adjuster. Therefore, even if the position of the surface of the molten metal plating bath changes due to an increase or decrease in the plating solution,
The cylindrical body of can be floated in the molten metal plating bath.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the top dross scraping device of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view showing an embodiment of the top dross scraping device of the present invention, and FIGS. 2, 3 and 4 are sectional views showing a part of the device in an enlarged manner. The top dross scraping device 10 includes a frame 20 and
The frame 20 is provided with a carrier 30 that conveys the scraped top dross to the outside, and a scraper 50 that rotates while floating in the hot dip galvanizing bath 12. In the hot-dip galvanizing bath 12, the top dross 14 floats on the hot-dip zinc 16.

The frame 20 has an arm 22 extending obliquely upward from the vicinity of the surface of the hot-dip galvanizing bath 12, and a support member 24 for supporting the arm 22. A height adjuster 18 for moving the support member in the vertical direction is attached to the support member 24. By changing the position of the adjustment pin 18a of the adjuster 18, the support member 24 is moved in the vertical direction. The scraper 50 can be moved up and down.
For this reason, the hot dip galvanizing bath 12 can be changed depending on the number of plating baths.
Even if the position of the surface of the scraper changes, the scraper 50 can be floated in the hot dip galvanizing bath according to this change. A caster 19 is fixed to the lower portion of the height adjuster 18, and the top dross scraping device 10 can be moved by moving the height adjuster 18. Thereby, the scraper 50 can be freely moved on the surface of the hot-dip galvanizing bath 12. A geared motor (an example of a driving machine according to the invention) 26 is fixed to the frame 20 on the upper end side of the carrier 30. This geared motor 26
Is protected from heat from below by a heat shield plate 28 attached to the arm 22.

The carrier 30 includes a first cylindrical body 32 fixed to the arm 22. This first tubular body 32
Is a cylindrical inclined portion 34 extending obliquely upward along the arm 22 from the vicinity of the surface of the hot dip galvanizing bath 12, and the inclined portion 3
4 is a cylindrical floating portion 36 extending continuously from the lower end of the molten galvanizing bath 12 to the surface of the hot dip galvanizing bath 12. Slope 3
A shaft 38 is rotatably inserted into the shaft 4, and the upper end of the shaft 38 is connected to the drive shaft 26b of the geared motor 26 via a coupling 26a. A lower end of the shaft 38 is rotatably supported by a bearing 40, and a pinion 42, which is a gear-shaped transmission member that transmits the rotational force of the shaft 38, is fixed to the lower end of the shaft 38. Further, a first screw 44 is fixed to the shaft 38 so as to surround the outer peripheral surface of the shaft 38 in a spiral shape. As described above, since the shaft 38 is connected to the geared motor 26 and the first screw 44 is fixed to the shaft 38, by driving the geared motor 26, the first screw 4 is driven.
By rotating 4 the top dross carried by the scraper 50 can be carried to the dross carriage 46.

The scraper 50 includes a second tubular body 52, a closed hollow buoyant body 54 inserted into the second tubular body 52 and having an end 54a fixed thereto, and a buoyant force. A second screw 56 fixed to the buoyancy body 54 is provided so as to spirally surround the outer peripheral surface of the body 54. Scraper 50
Are floated on the hot dip galvanizing bath 12 by the buoyant body 54. The shaft 38 is provided at the end portion 52 a of the second tubular body 52.
An internal gear-shaped transmission portion 52b that meshes with the pinion 42 and transmits the rotational force of the shaft 38 is formed, and the second tubular body 52 also rotates as the shaft 38 rotates. A plurality of openings 62 are formed on the outer peripheral surface of the second tubular body 52, and a projecting piece 64 projects from the peripheral edge of each opening 62.

The manner in which the top dross scraping device 10 is used to scrape and collect the top dross will be described with reference to FIGS. 1 to 4. Geared motor 26
When the shaft 38 is driven to rotate, the second tubular body 52 is rotated along with the rotation of the shaft 38, as shown in FIG.
Rotates in the direction indicated by arrow 66. When the second tubular body 52 rotates in the direction indicated by the arrow 66, the top dross is forcibly scraped by the projecting piece 64 and is scraped into the inside of the second tubular body 52 through the opening 62. The top dross that has been scraped into the inside of the second tubular body 52 is the end portion 52 of the second tubular body 52 as the second screw 56 rotates.
It is transported to a. The top dross transported to the end portion 52 a is transported to the upper end of the inclined portion 34 of the first tubular body 32 by the rotating first screw 44 and is collected by the dross carriage 46. As described above, since the casters 19 are fixed to the lower part of the height adjuster 18, the top dross scraping device 1 is moved at the same time when the height adjuster 18 is moved.
0 can also be moved laterally. This allows
The scraper 50 can be freely moved on the surface of the hot-dip galvanizing bath 12, for example, in the direction indicated by the arrow 68.
Therefore, the hot dip galvanizing bath 1 in which the scraper 50 has moved
The top dross on the surface of No. 2 can be completely removed and recovered including the top dross hardened like a sponge. in this way,
By using the top dross scraping device 10, a clean hot-dip galvanizing bath can be obtained and the top dross can be scraped out efficiently. In addition, since a clean hot-dip galvanizing bath can be obtained, a higher quality plated steel sheet can be obtained, and the life of equipment in the plating bath can be extended.

[0020]

As described above, according to the top dross scraping device of the present invention, since the scraper rotates while floating in the molten metal plating bath, the top dross floating in the molten metal plating bath. The scraps are scraped and collected inside the scraper, and then conveyed outside by the conveyor, so that the top dross can be scraped out from the molten metal plating bath.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of a top dross scraping device of the present invention.

2A and 2B are enlarged sectional views and FIG. 2B is a sectional view taken along line AA of FIG. 2A, showing a floating portion of the top dross scraping device of FIG.

3A and 3B show a second cylindrical body of the top dross scraping device of FIG. 1, FIG. 3A is an enlarged plan view, and FIG. 3B is a sectional view taken along line BB of FIG.

FIG. 4 is a cross-sectional view schematically showing how top dross is scraped while being scraped.

[Explanation of reference numerals] 10 top dross scraping device 12 hot dip galvanizing bath 14 top dross 16 hot dip zinc 18 regulator 18a adjusting pin 19 caster 20 frame 22 arm 24 support member 26 geared motor 26a coupling 26b drive shaft 28 heat shield plate 30 transporter 32 first tubular body 34 inclined portion 36 floating portion 38 shaft 40 bearing 42 pinion 44 first screw 50 scraper 52 second tubular body 54 buoyancy body 56 second screw 62 opening 64 protrusion Piece

Claims (2)

[Claims] 1. A top dross scraping device for scraping out a top dross floating in a molten metal plating bath, a frame having an arm extending obliquely upward from the vicinity of the surface of the molten metal plating bath and a supporting member for supporting the arm. And a cylindrical inclined portion extending obliquely upward along the arm from near the surface of the molten metal plating bath, and a cylindrical floating extending continuously from the lower end of the inclined portion to the surface of the molten metal plating bath so as to float. A first cylindrical body having a portion fixed to the arm, a drive unit disposed on the upper end side of the inclined portion and fixed to the arm, and connected to a drive shaft of the drive unit. A rotating shaft that is inserted into the inclined portion and has a transmission member that transmits a rotational force fixed to the lower end portion, and a first disc that is fixed to the shaft so as to spirally surround the outer peripheral surface of the shaft. And a plurality of openings formed on the outer peripheral surface, a projecting piece projecting from the peripheral edge of the opening, and a transmission portion to which the rotational force is transmitted from the transmission member, and the end portion is rotatable to the floating portion. A second tubular body that is inserted into the second tubular body and rotates while floating in a molten metal plating bath, and is fixed while being inserted into the second tubular body.
A top dross scraping device comprising: a closed hollow buoyant body, and a second screw fixed to the buoyant body so as to spirally surround an outer peripheral surface of the buoyant body. 2. The top dross scraping device according to claim 2, further comprising a height adjuster for vertically moving the support member.