JPH0623561Y2 - 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. 4 shows a manufacturing process of an alloying-treated steel sheet in a continuous hot dip galvanizing line. The strip 1 whose mechanical properties and temperature are adjusted in a continuous furnace has a non-oxidized strip surface through a snout 2. While being kept in such a state, it penetrates into the molten zinc bath in the zinc pot 3 and is plated while circulating around the sink roll 4, and the pass line is fixed by the collecting roll 5 and the stabilizing roll 6, and the wiping nozzle 7 The amount of zinc adhered is adjusted by means of the above, and alloying treatment is carried out in the next-stage carbanile furnace 8.

(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. By the rising gas flow of, is carried into the galvanile furnace, where it is oxidized to zinc oxide,
When adhered to the inner wall of the furnace or when heating the strip in the galvanic furnace, zinc fume generated from the surface of the strip is similarly oxidized and adhered to the inner wall of the furnace. Zinc oxide deposited and laminated on the inner wall of the furnace in this way 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 treatment, resulting in an unplated surface defect, This will reduce the quality and yield of the plated steel sheet.

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.

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 inserts a vertically moving fluid spraying header into the galvannealing furnace, and compresses by this header. In order to prevent the shake when the fluid is sprayed, a mechanism for applying proper tension by the elevating device to the vertical direction of the header is provided, and a shake preventer in the front-rear direction when the header is moved up and down is provided.

(Operation) In the present invention, the compressed fluid sprayed from a large number of nozzles provided in the fluid spray header acts evenly over the entire inner wall of the furnace, and safe removal work is possible in a hot state. Become.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

9 is a fluid spraying header (hereinafter referred to as "header")
The compressed fluid supply hose 11 which is inserted over the entire inner width of the galvanneale furnace 8 and is fed from the hose reel 10 is connected to the outer end thereof. The header 9 is provided with a large number of nozzles 12 facing the furnace wall 8a, and a guide roller 13 for preventing the header 9 from swinging in the front-rear direction is provided at an appropriate portion.

Reference numeral 14 is an elevating device provided on the upper and lower sides of the outer side of the galvannealing furnace 8, each of which is a pair of drums 15, an electric motor 16 for rotating the drum 15 forward and backward, and a gear mechanism 17 for transmitting the rotation of the electric motor 16 to the drum shaft. Is equipped with.

Reference numeral 18 denotes a chain or a wire rope, which are respectively wound around the drum 15 and extended via guide rollers 19 which are provided above and below the galvanile furnace 8 and have their respective ends with respect to the header 9 described above. Are connected with the fitting 20.

In the figure, 21 is a cylinder for moving the guide roller 19 forward and backward, and 22 is a side wall door of the galvannealer 8.

By the way, when the device of the present invention is not used, the vertical lifting device 14 stands by with each drum 15 winding the chain or wire rope 18.
Is also placed on the floor. In use, a chain or wire rope 18 is first pulled out from the drum 15 of the upper / lower lifting device 14, and the tip of the chain or wire rope 18 is passed through the furnace to extend to the floor surface and connected to the header 9. A chain or wire rope 18 is withdrawn from the drum 15 of 14 and its ends are connected to the header 9. Then, a compressed fluid supply hose 11 is connected to the header 9, where the upper lifting device 14 is activated to wind the header 9 to the lower part of the furnace, and then the lower lifting device 14 is activated in the reverse direction to chain or wire rope 18 Appropriate tension is applied to. And in this state, the guide roller 1
The position of the header 9 with respect to the space between the inner walls 8a of the furnace is adjusted by 9 and the header 9 is raised to a target position at a constant speed, while the nozzle 12 of the header 9 sprays a compressed fluid on the inner wall 8a of the furnace at all times. The zinc oxide that has been adhered to and laminated on is removed. At this time, the header 9 may be reciprocated up and down as many times as necessary according to the degree of adhesion of zinc oxide to be removed. The removed zinc oxide is recovered and removed by placing a saucer or a heat insulating sheet at the bottom of the furnace. It

In the above embodiment of the present invention, the tension is applied to the chain or the wire rope 18 by the elevating device 14. However, tension applying means using balance weight may be adopted, and the header 9 may be further used. It is also possible to shorten the idle time by varying the ascending / descending speed and performing a removing operation suitable for the adhesion state of zinc oxide.

(Effects of the Invention) As described above, the present invention inserts a fluid spraying header that moves up and down in a galvanneale furnace, and injects a compressed fluid from a nozzle of the header all the way to cover the entire inner wall of the furnace. It is designed to exert a removing action, can efficiently remove zinc oxide in a short time in a hot state, and improve the quality of galvannealed steel sheet,
Various operational problems can be solved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG.
II-II sectional view in the figure, FIG. 3 is the same III-III sectional view,
FIG. 4 is an explanatory diagram of a manufacturing process of an alloyed steel sheet in a continuous hot-dip galvanizing line. 8 is a galvannealer, 9 is a header for fluid spraying, 12
Is a nozzle, 13 is a guide roller, 14 is a lifting device, 18
Is a chain or wire rope.

Claims (3)

[Scope of utility model registration request] 1. An oxidation in a galvannealing furnace, comprising a fluid spraying header having a large number of nozzles facing the furnace wall of the galvannealing furnace, and means for moving the header up and down in the furnace. Zinc removal device. 2. A mechanism for providing a fluid spraying header elevating device at the upper and lower parts of a galvanneale furnace, and a mechanism capable of constantly applying a predetermined tension to a chain or a wire rope connecting the elevating device and the fluid spraying header. The zinc oxide removing apparatus according to claim 1, wherein the zinc oxide removing apparatus is a zinc oxide removing apparatus. 3. The zinc oxide removing apparatus according to claim 1 or 2, further comprising means for preventing swinging in a plate thickness direction in the furnace when the fluid spraying header is moved up and down.