JP2018145493A - Apparatus for removing suspended matter of molten metal on bath surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a removal apparatus capable of efficiently removing a suspended matter existing at any position on a bath surface while suppressing the variation and fluctuation of the surface of molten metal.SOLUTION: An apparatus for removing a suspended matter is constituted of a tubular body 2 having a capture opening 2a opened toward the bath surface of molten metal and an apparatus body 3 movable along an outer edge portion of a bathtub 1. The apparatus body 3 includes a moving mechanism connected to the end part 2b of the tubular body 2 and movably supporting the tubular body 2 along the bath surface on the bath surface of the molten metal and a suction mechanism for placing the capture opening at a position higher than the average position of the bath surface to suck a suspended matter floating on the bath surface of the molten metal through the capture opening.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an apparatus suitable for removing floating substances floating on a molten metal bath surface, in particular, a top dross floating on a hot dip galvanizing bath surface when a steel strip is subjected to a hot dip galvanizing treatment. The present invention relates to a removal apparatus suitable for discharging floating substances such as (mainly zinc oxide and Fe—Al alloys) out of the system (outside the bathtub).

  It is known that a foreign substance called dross is generated on a bath surface of a molten metal, particularly in a plating bath used for a hot dip galvanizing process. As its cause, it is known that Fe eluted from the steel strip reacts with aluminum or zinc in the plating bath to generate an intermetallic compound, or zinc is oxidized.

  Among these, dross having a density higher than that of zinc becomes bottom dross (mainly Fe—Zn alloy) and settles and deposits in the hot dip galvanizing bath. On the contrary, dross having a density lower than that of zinc becomes top dross (mainly zinc oxide, Fe—Al alloy, etc.) and floats from the hot dip galvanizing bath to the bath surface.

  The top dross that floats to the bath surface of the plating bath increases with the progress of the plating process, and this deteriorates the appearance quality of the product when it adheres to the outer surface of the steel strip that passes through the plating bath. It is indispensable to remove floating substances floating on the bath surface.

  As a prior art for the purpose of removing floating substances floating on the bath surface of a plating bath, for example, Patent Document 1 discloses a robot body movable along the width direction of a molten metal plating tank, and a robot body. It is composed of an arm provided and a dross collection net attached to the tip of the arm, and draws and holds the dross by the dross collection net, lifts and transfers the dross from the plating bath, and An apparatus has been proposed in which loading into a dross collection box is sequentially performed by a program control mechanism.

  Further, in Patent Document 2, a supply nozzle and a suction nozzle are provided in the snout, respectively, and molten plating metal is supplied by the supply nozzle, while dross near the liquid surface of the molten plating metal is sucked from the suction nozzle to remove the outside of the snout. In addition, in Patent Document 3, a rotating blade for stirring is provided on the drive shaft of the immersion snap roll installed in the continuous hot dip galvanizing tank, and the rotating blade is used as the top. An apparatus for moving the dross has been proposed.

JP-A-5-302157 JP 2005-220404 A JP 59-16958

  By the way, in the prior art proposed by the said patent documents 1-3, all have the malfunction as described below, and it is still enough in the point which removes the floating substance which floats on the bath surface of a bathtub. That was not the case.

  That is, the apparatus as disclosed in Patent Document 1 has a high possibility of causing defects such as ash due to large shaking of the bath surface of the plating bath when dross is gathered. In addition, since the device itself is huge and its movable range is limited, it is necessary to manually scrape the dross that exists in a place that may interfere with other equipment installed in the plating bath. There is concern.

  Moreover, the apparatus of patent document 2 is limited to application only inside a snout, and consideration is not paid to removing the floating substance which floats in the whole bathtub in which the molten metal was accommodated. Furthermore, the device of Patent Document 3 merely eliminates the local accumulation of the top dross and cannot discharge itself out of the system.

  An object of the present invention is to efficiently remove floating substances present in any place without causing interference with other equipment and facilities arranged in a bathtub without accompanying bath surface fluctuations and fluctuations. The present invention proposes an apparatus for removing molten metal bath surface floating material.

  The present invention is an apparatus for removing suspended matter floating on a molten metal bath surface accommodated in a bathtub, a tubular body having a capture port opened toward the molten metal bath surface, A device body movable along the outer edge of the bath, the device body connected to the distal end of the tubular body, the tubular body being movable on the molten metal bath surface along the bath surface A moving mechanism to support, and a suction mechanism in which the trapping port is installed at a position higher than the average position of the bath surface, and a floating substance floating on the bath surface of the molten metal is sucked through the trapping port. An apparatus for removing floating matter on a bath surface of a molten metal. Here, during operation, a distance meter is scanned above the bath surface of the molten metal to measure the vertical distance to the bath surface at an arbitrary location, and the average position of the distance is referred to as the bath surface position and captured. The mouth means that the bath surface position is set as a reference, that is, set at a position higher than 0 mm.

  In the apparatus having the above-described configuration, the movement (running) pattern of the apparatus body and the movement pattern of the tubular body are integrated computers based on position information of other devices installed in the bathtub and position information of the apparatus body. It is desirable to be automatically controlled by an operation command of the (high-order computer), and the molten metal can be applied regardless of the type of molten metal, but is particularly applicable to a hot dip galvanizing bath. Is preferred.

  According to the present invention, the apparatus main body is movable along the outer edge of the bathtub, and the tubular body connected to the apparatus main body is movable along the molten metal bath surface starting from the apparatus main body. Therefore, it is possible to efficiently suck and remove the suspended matter existing at any position through the trapping port while avoiding interference with other devices and facilities.

  The suction and removal of the suspended matter is performed in a state where the capturing port is installed at a position higher than the average position of the bath surface, so that the bath surface fluctuation and fluctuation are suppressed, and defects due to adhesion such as ash do not occur.

  Furthermore, according to the present invention, the movement pattern of the apparatus main body and the movement pattern of the tubular body are automatically controlled by the operation information of the integrated computer based on the position information of other equipment installed in the bathtub and the position information of the apparatus main body. By doing so, it is possible to realize complete automation of the removal work of the floating substance on the bath surface.

It is the figure (plan view) which showed typically the example which applied embodiment of the removal apparatus of the molten-metal bath surface floating material according to this invention to the bathtub of the molten metal plating equipment. It is the figure which expanded and showed the principal part of the side surface of FIG. 1 (a bathtub is a cross-sectional display). It is the figure which showed the operation | movement and the control point of the removal apparatus of the molten-metal bath surface melt according to this invention.

Hereinafter, an example of the present invention will be described more specifically with reference to the drawings.
FIG. 1 is a plan view showing an embodiment of a molten metal bath surface float removal apparatus suitable for use in the practice of the present invention, applied to a bathtub of a molten metal plating facility, and FIG. FIG. 2 is a partially enlarged view of the side surface of the facility shown in FIG.

  Reference numeral 1 in the figure is a bathtub in which a molten metal plating bath M is accommodated, and 2 is a tubular body disposed on the upper part of the bathtub 1. The tubular body 2 has a capturing port 2a that is open toward the bath surface of the molten metal plating bath M at the tip. The material of the tubular body 2 is not particularly limited. However, since the molten metal passes through the inside, a material having resistance can be selected as appropriate according to the type of the molten metal. For example, in the case of molten zinc, a stainless pipe or the like can be used. In particular, SUS309S and SUS310S are suitable because they are excellent in heat resistance and oxidation resistance. In addition, the shape of the capture port 2a is not particularly limited, and various shapes such as a rectangle, a square, a circle, an ellipse, a combination of these, and the like can be applied. The shape can be set as appropriate, but from the viewpoint of avoiding the adhesion of the molten metal inside, it is considered desirable to have a shape without corners (such as rounded corners when using a rectangular or square pipe).

  Reference numeral 3 denotes an apparatus main body installed at the outer edge of the bathtub 1. The apparatus main body 3 is connected to the end portion 2b of the tubular body 2 and supports the tubular body 2 on the bath surface of the molten metal plating bath M so as to be movable along the bath surface. FIG. 1 shows an example in which a turning mechanism is employed as a moving mechanism. For example, a turning mechanism (not shown) including a drive source such as a motor, a speed reducer, a gear, and the like, and a capture port of the tubular body 2 are shown. A suction mechanism (not shown) configured by means such as a pump, for example, can suck the suspended matter floating on the bath surface of the molten metal plating bath M while keeping the bath surface 2a close to the bath surface. Z).

  Reference numeral 4 denotes a recovery box for recovering suspended matter sucked through the capture port 2a of the tubular body 2 on the outlet side of the end portion 2b of the tubular body 2, and reference numeral 5 denotes the apparatus main body 3 for the tubular body 2 and the recovery box 4 It is a gantry to be placed together. The gantry 5 is a self-propelled type that drives wheels by a drive source. Reference numeral 6 denotes a track or a traveling path that is provided at the outer edge of the bathtub 1 and causes the gantry 5 to travel along the periphery of the bathtub 1.

  In the bathtub 1 of the molten metal plating facility, a snout for guiding the steel strip to be plated to the plating bath, a sink roll disposed in the bathtub 1 for guiding the steel strip upward, and a steel installed on the upper portion of the sink roll. Other equipment and facilities such as a pair of support rolls that stabilize the running posture of the belt and correct its shape are installed, but the removing device according to the present invention is a moving pattern of the device main body 3, a tubular body As shown in FIG. 3, the turning pattern 2 can be controlled by an operation command of an integrated computer based on position information of other equipment, position information of the apparatus body 3, and a turning angle of the tubular body 2. This makes it possible to efficiently suck and collect suspended matter existing at any position on the bath surface without interfering with other equipment.

  The removal device according to the present invention may be provided on each side of the bathtub 1 to remove the floating substance on the bath surface, or the single removal device may be appropriately run around the bathtub 1 to float on the bath surface. Things may be removed, and this point is not particularly limited.

  In addition, it is preferable to use a tubular body 2 having a length and a moving mechanism so that the entire bath surface can be covered. As the moving mechanism, the above-described swiveling mechanism or a retractable mechanism is applied. be able to. In particular, when the tubular body 2 having a function capable of expanding and contracting the length with the swivel mechanism is applied, the bath surface floating material is efficiently removed while the traveling frequency of the gantry 5 and the swivel frequency of the tubular body 2 are reduced. Is possible.

  At the time of sucking the bath surface suspended matter, the capture port 2a of the tubular body 2 is opened above the average position of the bath surface of the molten metal from the viewpoint of avoiding bath surface fluctuation and fluctuation. That is, the capturing port 2a of the tubular body 2 is brought close to the molten metal bath surface. Specifically, the gap t from the average position of the bath surface of the molten metal to the capture port 2a needs to be greater than 0 mm. On the other hand, if the gap t is too large, an excessive suction force is required, and therefore the gap t is more preferably about 5 to 10 mm.

  In order to make it possible to appropriately adjust the gap t from the average position of the molten metal bath surface to the capture port 2a of the tubular body 2, the apparatus main body 3 may be provided with a lifting mechanism for moving the tubular body 2 up and down. it can.

  For example, in the case of performing hot dip galvanizing treatment as a hot metal plating treatment, when removing the top dross floating on the bath surface of the bathtub 1 manually, it took about 1.0 to 2.0 hours per time. On the other hand, according to the removal apparatus according to the present invention, it was confirmed that complete automation is possible and manpower is unnecessary.

  In the present invention, the case where the removing device is applied to the molten metal plating facility has been described as an example. However, the present invention is also applied to, for example, a casting facility where floating matter floating on the molten metal bath surface becomes a problem. And is not limited to application to hot metal plating equipment.

  ADVANTAGE OF THE INVENTION According to this invention, the removal apparatus which can remove efficiently the suspended | floating matter which exists in the arbitrary positions of a bath surface can be provided, after suppressing the bath surface fluctuation | variation and fluctuation of molten metal as much as possible.

DESCRIPTION OF SYMBOLS 1 Bathtub 2 Tubular body 2a Capture port 2b End part 3 Apparatus main body 4 Collection box 5 Base 6 Track (traveling path)
M Molten metal plating bath

Claims (3)

An apparatus for removing suspended matter floating on a molten metal bath surface accommodated in a bathtub,
A tubular body having a capture port opened toward the bath surface of the molten metal, and a device main body movable along the outer edge of the bathtub,
The apparatus main body is connected to the end of the tubular body, and a moving mechanism that supports the tubular body movably on the molten metal bath surface along the bath surface; And a suction mechanism for sucking floating matter floating on the molten metal bath surface through the trapping port, and removing the molten metal bath surface floating matter.   The travel pattern of the device main body and the movement pattern of the tubular body are automatically controlled by the operation information of the integrated computer based on the position information of other devices installed inside and outside the bathtub and the position information of the device main body. The apparatus for removing a floating surface of a molten metal bath according to claim 1, wherein:   The apparatus for removing a floating surface of a molten metal bath according to claim 1 or 2, wherein the molten metal is molten zinc.

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