JPS63180080A - Dross removal equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a dross removal device for suctioning and removing dross floating on the surface of a molten metal.

Conventional technology For example, in hot-dip plating, when the object to be plated is immersed in molten metal and then pulled up from the molten metal,
Air blowing was performed to remove excess molten metal from the object to be plated. At this time, the surface of the blown molten metal particles is oxidized, and the molten metal particles are surrounded by a dross coated with molten metal oxide, which floats on the molten metal surface. In conventional devices for removing dross of this type, the dross floating on the surface of the molten metal was suctioned and removed by a vacuum suction device via a suction head.゛Problems to be solved by the invention However, since dross is a mixture of molten metal and its oxide, if all the dross is sucked out, molten metal that can be effectively used will also be discarded, which is extremely uneconomical. There was a problem.

The present invention solves the above problems, and aims to provide a dross removal device that separates oxides from molten metal and removes only the separated oxides by suction.

Means for Solving the Problems In order to solve the above problems, the present invention provides an apparatus for suctioning and removing dross floating on the surface of molten metal using a suction head, which is capable of transporting dross in a fixed direction while stirring the dross. A dross removal device characterized in that a stirring and conveying device is provided toward the deep part of the molten metal layer at a certain depth from the surface of the molten metal.

Effect In the above configuration, the dross is conveyed to the deep part of the molten metal layer at a certain depth while being stirred by the stirring conveyance device, and the particles are bonded together by the water head pressure of the molten metal layer during conveyance, and the particles are bonded by the stirring action. particles can be separated from each other. This separates the molten metal particles from the oxide forming the lidros coating. That is, when the dross particles are bonded, the molten metal particles are directly bonded to each other at a certain portion, and the molten metal particles except for this bonded portion are covered with an oxide film. When the bonded dross particles are separated,
The oxide film is broken at the joint, and the molten metal particles inside the oxide film fuse with the molten metal around the film, causing the molten metal particles to escape from the oxide film. Separation Next, the molten metal and oxide transported deep into the molten metal layer are separated by floating the oxide with a small specific gravity on the surface of the molten metal. Then, only the oxides floating on the surface of the molten metal are removed by suction by the suction head.

EXAMPLE Hereinafter, an example of the present invention will be described based on the drawings. 1 and 2, a frame 3 is provided in the molten metal tank 1 to partition a certain range of the molten metal surface corresponding to the suction head 2 over a certain depth. Inside this frame 3, a stirring conveyance bag vX14 is provided extending from the molten metal surface to a certain depth deep inside the molten metal layer of the frame 3. The stirring and conveying device 4 is formed by a tubular body 5, a stirring screw 6 provided in the tubular body 5, and spirally extending in the direction of the tube axis, and a motor 6a that drives the stirring screw 6.

The pipe body 5 communicates with the molten metal layer inside the frame body 3 through a lower opening 5a on the lower end side, and communicates with the molten metal layer on the outside of the frame body 3 through an upper opening 5b provided on the side of the upper end. . And the pipe body 5
In front of the upper opening 5b, an enclosure 8 is provided in communication with the upper opening 5b and partitions a certain area of the surface of the molten metal in which the object 7 to be plated is immersed.

Inside this enclosure 8 is a pair of scraping screws 9a.

9b are arranged in parallel in the horizontal direction on both sides of the object to be plated 7 toward the upper opening 5b of the stirring and conveying device i14. The scraping screws 9a and 9b are spirally formed in directions opposite to each other, and have freely rotating shafts 10a and 10, respectively.
It is operatively connected to drive motors lla and llb via b. And the scraping screw 9a.

9b, rotating shafts 10a, 10b, and drive motors lla, ll
b and the raking device t! 12 is formed.

The effects of the above configuration will be explained below.

First, the dross 13 floating on the surface of the molten metal in the enclosure 8 is collected by scraping screws 9a and 9b of the scraping device 12.
It is raked toward the upper opening 5b. At this time, the scraping screws 9a, 9b are rotated inwardly adjacent to each other, and the dross 13 is removed by the scraping screws 9a, 9b.
5b toward the upper opening 5b. And the stirring conveyance device from the upper opening 5b! The dross 13 that has entered the tube 4 is conveyed inside the tube 5 toward the deep part of the molten metal layer inside the frame 3 while being stirred by the stirring screw 6. During this transportation, the particles of the dross 13 are bonded together by the water head pressure of the molten metal layer, and the bonded particles are separated by the stirring action. That is, as shown in FIG. 3, during joining, the particles of dross 13 are directly joined to each other at certain parts of the molten metal 14 particles, and the molten metal 1 except for this joined part is
A state A is reached in which the particles of No. 4 are covered with a film made of the oxide 15 of the molten metal 14. Then, when the particles of the dross 13 in this bonded state are separated, a state B occurs in which the film of the oxide 15 is broken at the bonded portion.

and.

In this state B, the particles of the molten metal 14 inside the oxide 15 coating fuse with the molten metal 14 existing around the coating, and the molten metal 14 is removed from the oxide 15 coating.
Next, the molten metal 14 and oxide 15 that have been separated and transported to the deep part of the molten metal layer are oxidized by floating the oxide 15 with a small specific gravity on the surface of the molten metal inside the frame 3. It is separated into a layer of material 15 and a layer of molten metal 14. and,
Only the oxides 15 floating on the surface of the molten metal are removed by suction by the suction head 2.

Effects of the Invention As described above, according to the present invention, the dross is stirred and conveyed deep into the molten metal layer at a certain depth using a stirring conveyance device, thereby separating the dross into molten metal and oxides, and removing only the oxides. It can be removed. This eliminates the waste of molten metal contained in dross and improves economic efficiency.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing one embodiment of the present invention, FIG. 2 is a view taken along the line aa in FIG. 1, and FIG. 3 is an action diagram showing bonding and separation of particles. 1... Molten metal tank, 2... Suction head, 3...
frame body. 4... Stirring conveyance device, 12... Scraping device, 13.
... Dross, 14... Molten metal, 15... Oxide.

Claims (1)

[Claims] 1. A device for suctioning and removing dross floating on the surface of the molten metal using a suction head, the stirring and conveying device capable of conveying the dross in a certain direction while stirring the dross, at a certain depth from the surface of the molten metal. A dross removal device characterized by being installed toward the deep part of the molten metal layer. 2. The dross removing device according to claim 1, further comprising a raking device for raking dross floating on the surface of the molten metal in a fixed direction toward the stirring and conveying device. 3. A frame body is provided to partition a certain range of the molten metal surface where the suction head is placed, and the stirring conveyance device is provided from the molten metal surface outside the frame body to the deep part of the molten metal layer at a certain depth inside the frame body. A dross removal device according to claim 1.