JP2010196135A - Device for collecting plating powder of hot-dip plating - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for collecting plating powder of hot-dip plating, wherein process environment is improved by improving suction factor of the plating powder stripped by a support roller and effectively sucking scattered plating powder, and, as the result, an increase in yield of plated steel plate is attained. <P>SOLUTION: The device for collecting the plating powder of hot-dip plating is provided with a dust collecting hood 2 for catching the plating powder and a connection arm 12 for synchronously moving the hood 2 in accordance with opening and closing movement of the support roller 11. The top end part of the dust collecting hood 2 is inclined to the outer side for a plated steel plate 15, and has a first suction port 13a which covers the outer periphery of the support roller 11 and sucks plating powder stripped from the support roller 11. Also, a second suction port 13b for catching scattered plating powder which can not be completely caught by the first suction port 13a, is provided on the top end part on the upper surface of the dust collecting hood 2. Further, a parting plate is provided between the first suction port 13a and the second suction port 13b. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a plating powder dust collector for hot dipping that collects a plating powder that scatters when passing through a support roll on a plating bath in a continuous hot dipping line.

  Hot-dip Zn-plated steel sheets, hot-dip Al—Zn-plated steel sheets and the like are widely used mainly in the fields of building materials, automobiles, home appliances, electronic devices and the like due to their high rust prevention properties.

When manufacturing such a hot-dip galvanized steel sheet, first, hot dip plating is performed on the steel sheet surface by passing a steel sheet such as a cold-rolled sheet through a plating bath sink roll such as snout or Zn and a support roll in the bath. Then, the molten metal is led out of the plating bath, and excess hot dip plating adhering to the steel sheet is removed by a gas wiping nozzle. Thereafter, the product is passed through a support roll on the bath and wound around a coil to obtain a product.
Said support roll is arrange | positioned as a countermeasure of holding | maintaining the pass line of a subsequent process, and the vibration prevention of the steel plate in conveyance.

  When passing through the support roll, although it was adjusted to a predetermined basis weight by the gas wiping nozzle, since this plating has not yet completely solidified, contact between this support roll and the plated steel sheet causes Zn, Al, etc. The plating powder is scattered. Therefore, Patent Document 1 describes a plating powder dust collecting hood as shown in FIG. 1 for preventing scattering on a support roll. In the figure, 1 is a support roll, 2 is a dust collecting hood, and 3 is a plated steel plate.

JP 2000-328213 A

  However, since the dust collection hood described above is installed independently of the support rolls, for example, when the thickness of the steel sheet fluctuates due to passage of the widened portion of the coil connection point, the spacing between the support rolls is thereby increased. Because it fluctuates, it was not possible to install them in close proximity in consideration of this. For this reason, the suction rate of the plating powder peeled off by the support roll is not necessarily good. In addition, the plating powder that could not be absorbed by the dust collection hood scatters to the surroundings, and when it falls to the vicinity of the steel plate, there is a problem that the steel plate is damaged and the yield is reduced.

  The present invention advantageously solves these problems, improves the suction rate of the plating powder peeled off by the support roll, and also effectively sucks the scattered plating powder, thereby improving the yield of the hot-dip plated steel sheet. An object of the present invention is to provide a dust collector for plating powder capable of improving the resistance.

That is, the gist configuration of the present invention is as follows.
(1) A dust collector that collects plating powder scattered from a support roll installed above a plating bath of a continuous hot dipping line, the device including a dust collection hood for collecting plating powder, A connecting arm that synchronously moves the hood as the support roll opens and closes, the tip of the dust hood is inclined outward with respect to the plated steel plate, and the tip of the dust hood is A first suction port that covers the outer periphery of the support roll and sucks the plating powder peeled off from the support roll, and that collects scattered plating powder that cannot be collected by the first suction port. The dust collection hood is characterized in that the suction port of 2 is provided at the tip of the upper surface of the dust collection hood, and a partition plate is provided between the first suction port and the second suction port. apparatus.

  (2) The dust collecting hood has two independent suction systems for the first suction port for sucking the plating powder peeled from the support roll and the second suction port for sucking the scattered plating powder. The plating powder dust collecting equipment according to (1) above, wherein

  According to the present invention, since the support roll and the plating powder dust collection hood are opened and closed simultaneously, it is possible to flexibly cope with fluctuations in the thickness of the steel sheet. Further, since the suction port can be disposed close to the support roll, the suction rate of the plating powder is remarkably improved. Furthermore, the plating powder that could not be sucked by the suction port can be sucked. Therefore, it is possible to improve the yield, manufacture a steel plate with stable quality, and improve the in-process environment markedly.

It is a sectional side view of the conventional support roll and plating powder dust collection hood. It is side sectional drawing of the support roll and plating powder dust collection hood according to this invention. It is a front view of the plating powder dust collection hood according to the present invention. It is the figure which showed the defect rate of the steel plate with the invention example and the prior art example.

The elucidation process of the present invention will be described below.
The inventors first studied a method of bringing the dust collection hood close to the support roll. At this time, when the thickness of the steel plate changes, the dust collection hood and the support roll come into contact with each other, and the support roll may be damaged, and this scratch may damage the steel plate. found. In addition, it was found that the simultaneous drive control by the sequence also has a complicated mechanism, and it is difficult to synchronize from the size of the equipment.

Then, it came to the idea to connect a dust collection hood and a support roll.
2 and 3 show preferred examples of a plating powder dust collector for hot dipping in accordance with the present invention. In the figure, 11 is a support roll, 12 is a connecting arm, 13 is a dust collecting hood, 13a is a first suction port, 13b is a second suction port, 14 is an inclined surface, 15 is a steel plate after plating, 16, 17 Is a dust collecting port, 18 and 19 are dust collecting hoses. As shown in the figure, one end of the connecting arm 12 is connected to the shaft of the support roll 11 and the other end is connected to the dust collecting hood 13.

  By this connection, the gap between the support roll 11 and the dust collection hood 13 can be greatly reduced, and the amount of plating powder sucked from the first suction port 13a can be remarkably increased. At the same time, the trouble of breaking the steel sheet due to the hooking of the edge and the hood tip that occurs when the coil connection point increases is also eliminated.

Then, it was also found that the plating powder gradually accumulated on the upper surface of the dust collecting hood on the steel plate side, and then dropped and damaged the steel plate surface.
Therefore, the dust collecting hood 13 is provided with the inclined surface 14 and the second suction port 13b. Then, the plating powder that could not be collected by the first suction port 13a can be sucked.

  In the present invention, the support roll 11 may be a conventionally known one, but the connecting arm 12 is attached to the shaft portion thereof. The connecting arm 12 can be made of any material that can maintain the connection of the support roll 11 and the dust collection hood 13 at a desired distance and can ensure movement of the support roll 11 and the dust collection hood 13 in conjunction with each other. Etc. are not particularly limited. The distance between the support roll 11 and the dust collecting hood 13 is not particularly limited, but is preferably about 5 mm.

  The dust collection hood 13 has its tip end inclined to the outside with respect to the plated steel sheet, a second suction port 13b is provided on the upper surface, and the plating powder peeled off from the support roll 11 is sucked by the second suction port 13b. .

In order to prevent the plating powder collected from the second suction port 13b from entering the support roll 11 side port of the dust collection hood 13 and damaging the support roll 11, the second suction port 13b It is necessary to attach a partition plate underneath.
Further, when the plating powder is sucked, it can be sucked by one suction system, but as shown in FIG. 2, two independent suction mechanisms (16, 17, 18, 18, 19).
By adopting such a structure, the collecting ability of the plating powder was remarkably improved even with the same suction force as before. The suction force may be adjusted as appropriate according to the size of the apparatus.

When the cold-rolled steel sheet after continuous annealing is immersed in a hot-dip Zn plating bath at 460 ° C and pulled upward, the basis weight is adjusted to 50 g / m ² by gas wiping, and then the support shown in FIGS. The roll was passed through and then wound up to obtain a product.
The plating (Zn) powder suction amount at that time was measured. As a result, the conventional dust collection hood was 0.25 kg / hr, whereas in the present invention, it was 0.46 kg / hr.
In addition, the measuring method of the plating powder suction amount is as follows.
The amount of plating powder accumulated in the plating powder collection bag of the plating powder dust collector was collected for a certain period (4 days) and converted to the amount collected (kg) per hour for comparison.

Furthermore, the defect rate of the steel sheet at that time was investigated only for defects occurring at the place of the support roll on the bath. In addition, the measuring method of a defective rate is as follows.
The defect rate was investigated by the ratio of the number of failures due to splash defects to the production volume over a certain period. The result is shown in FIG.
As shown in the figure, it can be seen that the defect rate is remarkably reduced.
In the above-described embodiments, the Zn powder dust collection using the hot-dip Zn-plated steel sheet has been described. In addition, dust generated after hot dipping can be suitably collected.

  The present invention can significantly improve the yield of the hot-dip galvanized steel sheet, and thus can provide a high-quality and low-cost hot-dip galvanized steel sheet.

1 Support roll 2 Dust collection hood 3 Plated steel sheet
11 Support roles
12 Connecting arm
13 Dust collection hood
13a First suction port
13b Second suction port
14 Inclined surface
15 Steel plate after plating
16,17 Dust collector
18,19 Dust collection hose

Claims (2)

  A dust collector for collecting plating powder scattered from a support roll installed above a plating bath of a continuous hot dipping line, the apparatus comprising: a dust collection hood for collecting plating powder; and A connecting arm that synchronously moves the hood in accordance with the opening and closing movement, the tip of the dust collection hood is inclined outward with respect to the plated steel plate, and the tip of the dust collection hood is the support A second suction for collecting the scattered plating powder that has a first suction port that covers the outer periphery of the roll and sucks the plating powder peeled off from the support roll, and that cannot be collected by the first suction port. A plating powder dust collecting apparatus, characterized in that a mouth is provided at the tip of the upper surface of the dust collecting hood, and a partition plate is provided between the first suction port and the second suction port. The dust collection hood has two independent suction systems for the first suction port for sucking the plating powder peeled off from the support roll and the second suction port for sucking the scattered plating powder. The plating powder dust collector of Claim 1 characterized by the above-mentioned.

Images