JPH0630845Y2 - Zinc oxide removal device in galvanic furnace - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention removes zinc oxide adhering to the inner wall of a galvannealing furnace that performs galvannealing on a galvanized steel sheet in a continuous hot-dip galvanizing line. It is related to the device.

(Prior Art) Given the increasing demand for surface-treated steel sheets with excellent corrosion resistance, particular attention has been paid to weldability and workability as cold-rolled steel sheets as well as coating. It is a galvannealed steel sheet with excellent corrosion resistance and corrosion resistance. By the way, in a continuous hot-dip galvanizing line for producing such alloyed steel sheet, a so-called conventional hot-dip galvanized steel sheet that is usually used in an as-plated state and an alloy used after alloying after plating are used. Two types of chemical treated steel sheets are manufactured. Generally, these two types of steel sheets are normally manufactured continuously by appropriately switching them in the same line, and therefore the galvannealer furnace and the like required for producing alloyed steel sheets are also made offline by a trolley or the like. It is arranged in a structure that can.

FIG. 3 shows a manufacturing process of an alloyed steel sheet in a continuous hot-dip galvanizing line. The strip 21 whose mechanical properties and temperature are adjusted in a continuous furnace is a snout 22.
The surface of the strip is kept in the non-oxidized state through the inside of the zinc pot 23 and penetrates into the molten zinc bath and is plated while circulating around the sink roll 24, and is collected by the collecting roll 25 and the stabilizing roll 26. The pass line is fixed, the amount of zinc adhered is adjusted by the wiping nozzle 27, and the galvannealing furnace 28 at the next stage performs alloying treatment.

(Problems to be solved by the invention) By the way, in the galvannealing furnace for performing the alloying treatment of the strip as described above, during the alloying treatment, zinc and zinc fumes scattered at the time of wiping do not move or wipe the strip. As a result of the rising gas flow in the galvanile furnace, the zinc fumes generated in the strip surface when the zinc fumes are oxidized and converted into zinc oxide and adhere to the inner wall of the furnace or heat the strip in the galvanneale furnace. Is oxidized to adhere to the inner wall of the furnace, or when the roll for fixing the pass line provided in the lower part of the galvanic furnace could not be synchronized with the line speed, etc., the zinc deposited on the strip surface layer was stripped off, This is likewise transported to the galvanile furnace and oxidatively deposited inside the furnace. The zinc oxide deposited and laminated on the inner wall of the furnace in this manner is separated from the inner wall of the furnace by the accompanying flow accompanying the movement of the strip, and adheres to the strip surface during the alloying process, resulting in an unplated surface defect. However, the quality and yield of plated steel sheets will be reduced.

Further, in terms of operation, in order to remove this zinc oxide, not only is it necessary to change the schedule from the production of the alloyed steel sheet to the production of the hot dip galvanized steel sheet, but also the reduction of the line speed and the passing of the dummy coil may occur. It causes production inhibition such as necessity.

On the other hand, even when removing zinc oxide adhering to the inner wall of the galvanil furnace offline, it sometimes takes time to cool down the furnace, so it is sometimes necessary to work in a hot state. The method also relied on manual work in a harsh working environment in which a jig such as a rod was used to scrape off, or compressed air was blown from the bottom of the furnace with a hose.

The present invention has been made in order to solve the problems in the actual situation as described above, and an object thereof is to provide an efficient zinc oxide removing device by mechanical operation.

(Means for Solving the Problems) In order to achieve the above object, a zinc oxide removing device for a galvannealing furnace according to the present invention is a brush roll in which a brush material is embedded in the galvannealing furnace in a circumferential direction and a longitudinal direction of the roll. And a drive means for moving up and down and rotating the brush roll, and a dust collecting duct which is arranged at a position lower than the brush roll by a predetermined distance and moves up and down together with the brush roll. The zinc oxide powder separated from the inner wall of the furnace by the brush roll in contact with the apparatus is sucked and collected.

(Operation) With the above-described configuration, the present invention removes and removes zinc oxide powder adhering over the entire inner wall of the furnace by raising and lowering the brush roll while rotating in the galvannealing furnace. Since the removed zinc oxide powder is collected by the dust collector from the dust collection duct,
It is possible to prevent environmental pollution due to scattering of zinc oxide powder, and it is possible to perform safe removal work in a hot state.

(Embodiment) A zinc oxide removing apparatus in a galvanneale furnace showing an embodiment of the present invention will be described in detail below with reference to FIGS. 1 and 2.

1 and 2, reference numeral 1 is a galvanic furnace in which zinc oxide is removed by the device of the present invention, and 2 is a side wall door of the galvanic furnace 1, which is structured to be opened and closed when necessary. It is in an open state when zinc oxide is removed as shown in.

Reference numeral 3 denotes a brush roll, which is configured by embedding a brush material such as a stainless wire in the circumferential direction and the longitudinal direction of the roll, and has a length over the entire width of the galvanneale furnace 1. Reference numeral 4 denotes a dust collecting duct for sucking and recovering the zinc oxide powder separated and removed by the brush roll 3 so as not to scatter to the surroundings, and arranged at a position lower than the brush roll 3 by a certain distance. . Reference numeral 5 denotes a frame, which holds the brush roll 3 with a bearing 6 and fixes a dust collecting duct 4. Therefore, the dust collecting duct 4 keeps a certain distance from the brush roll 3 through the frame 5. The brush roll 3 moves as it moves up and down.

The brush roll 3 is connected via a shaft 7 and a coupling 8 to a motor 9 mounted on a support plate 5a integral with the frame 5, and is rotated by the motor 9. Further, the frame 5 has a shaft 1
It is connected to the pinions 11a and 11b via 0a and 10b, and the upper pinion 11a is connected to the motor 14 via the shaft 12 and the coupling 13 to rotate. Reference numeral 15 denotes an elevating guide frame, which is provided with a rack 16 as shown in FIG. 1 showing the arrow A in FIG.
Are configured to mesh with each other. Therefore, the motor 14
The frame 5 is moved up and down by the rotation of the pinion 11a by the driving.

The dust collecting duct 4 is connected to a dust collecting device 18 via a heat resistant flexible hose 17, and a dust collecting blower 19 connected to a motor 20 sucks and collects the zinc oxide powder that has been peeled and removed. Has become.

When the device of the present invention configured as described above is not used, the frame 5 is lowered by driving the motor 14, and the brush roll 3, dust collecting duct 4 and other removing devices stand by at a position below the galvanneale furnace 1 where they do not interfere. Only the elevating guide frame 15 is in a protruding state.

And, when using, in the standby state of the entire device,
The galvanic furnace 1 passes the guide frame 15 with the side wall door 2 opened, and moves the brush frame 3 to the brush roll 3 on standby. With the completion of the movement of this Galvanile furnace 1,
By driving the motor 14 and rotating the pinion 11a, the frame 5 is raised. By this rise,
When the brush roll 3 is inserted into the galvanneale furnace 1, the motor 9 is driven to rotate the brush roll 3, the zinc oxide powder adhering to the inner wall of the galvanile furnace 1 is peeled off, and the motor 20 is driven. The zinc oxide powder is sucked and collected from the dust collecting duct 4. Then, the brush roll 3 is moved up and down at a constant speed to remove and recover the zinc oxide powder adhering to the inner wall of the entire galvanile furnace 1.

(Effects of the Invention) As described above, the zinc oxide removing apparatus in the galvannealing furnace of the present invention is provided with the brush roll which can be moved up and down in the galvannealing furnace, and the rotation of the brush roll causes the oxidation adhered to the inner wall of the furnace. Zinc powder is removed over the entire area and can be suctioned and collected by the dust collection duct located near the brush rolls, enabling zinc oxide to be efficiently removed over the entire area of the furnace in a short time, while preventing environmental pollution around the environment. Is what you can do. Moreover,
It is possible to work in a hot state, and it is possible to improve the quality of galvannealed steel sheets and solve various operational problems. Further, the recovered zinc oxide powder can be reused and cost can be reduced, which is an extremely effective idea.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the device of the present invention, FIG. 2 is a partial plan view taken along the arrow A in FIG. 1, and FIG. Is. 1 is a galvannealer, 3 is a brush roll, 4 is a dust collecting duct, 9 is a brush roll driving motor, 11a and 11b are pinions, 14 is a lifting motor, 16 is a rack, 17 is a flexible hose, and 18 is a dust collector. .

Claims (1)

[Scope of utility model registration request] 1. A brush roll in which a brush material is embedded in the circumferential and longitudinal directions of the roll in a galvannealing furnace,
Drive means for raising and lowering and rotating the brush roll;
A dust collecting duct which is disposed at a position lower than the brush roll by a certain distance and moves up and down together with the brush roll, and the dust collecting duct is connected to a dust collecting device and is separated from the inner wall of the furnace by the oxidation to be removed by oxidation. An apparatus for removing zinc oxide in a galvanic furnace, which is configured to suck and recover zinc powder.