JPH0630846Y2 - Fluid spray header for deposit zinc removal equipment in galvannealing 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, which performs galvannealing on a galvanized steel sheet in a continuous hot-dip galvanizing line. The present invention relates to a fluid spraying header used in a 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 an 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. 2 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 is non-oxidized on the strip surface via 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 alloying treatment, and the galvannealing furnace 8 in the next stage performs alloying treatment. In addition, 19 in FIG. 2 shows a touch roll.

By the way, in the galvanneale 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 are moved in the galvanile furnace by the rising gas flow such as movement of the strip and wiping. And is oxidized there to become zinc oxide,
To adhere to the inner wall of the furnace or to heat the strip in the galvanile furnace, zinc fumes generated from the strip surface are also oxidized and adhere to the inner wall of the furnace or to stabilize the path at the lower end of the galvanile furnace. The roll attached to the scratch scratches the galvanized layer on the surface of the steel strip without synchronizing with the speed of the steel strip, and the generated zinc powder is carried to the inner wall of the furnace and adheres thereto. Zinc oxide adhered 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, adheres to the strip surface during the alloying treatment, and becomes 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 alloyed steel sheet to the production of hot-dip galvanized steel sheet, but there is also a decrease in line speed and the passage of dummy coils. 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.

Therefore, in order to solve such a problem, the applicant of the present invention has applied for Japanese Patent Application No. 1-116408 (Japanese Utility Model Laid-Open No. 3-55844).
And Jpn. Pat. Appln.
No. 7), a zinc removal device in a galvanic furnace which is efficient by mechanical operation is proposed and its effectiveness has been improved.

(Problems to be solved by the device) However, among the devices previously proposed by the present applicant (Japanese Utility Model Laid-Open No. 3-55844), the fluid spray header used for the device described in Japanese Patent Application No. 1-116408 is A huge amount of air is required in order to spray the fluid from one header to the entire inner wall of the galvanneale furnace at the same time. Therefore, if the capacity of the air supply source is small, the zinc powder removal efficiency decreases.

The inner wall of the galvannealing furnace is made of refractory, but in the general hot dip galvanizing line, the galvannealing furnace is used only during the production of alloyed steel sheet, and the refractory material is often heated and cooled. Transformation
Damage will occur, for example locally projecting into the furnace. Then, when the header is moved up and down to remove the zinc powder, the nozzle portion, the guide portion, and the like of the header come into contact with this protruding portion, causing trouble such as nozzle damage.

It was found that there are inherent problems such as.

The present invention has been made in order to solve the above problems in the actual situation, and an object of the present invention is to provide a fluid spraying header for an attached zinc removing device that is efficient and has few troubles.

(Means for Solving the Problems) In order to achieve the above object, a fluid spray header for a zinc oxide removing device of a first galvannealing furnace according to the present invention is a fluid spraying header for a depositing zinc removing device in a galvannealing furnace. Is a fluid spray header used in an apparatus for removing deposited zinc in a galvanile furnace in which a large number of nozzles are arranged so as to face the inner wall of the galvanile furnace. That is, the injection fluid supply pipe is provided in each of the divided fluid chambers.

Further, the fluid spray header for the deposited zinc removing device in the second galvannealer according to the present invention has a nozzle incorporated in the first fluid spray header.

(Operation) In the present invention, since the fluid chamber is divided into the header longitudinal direction and the fluid supply pipe is provided in each fluid chamber,
Regardless of the size of the fluid supply source, switching the fluid chamber enables efficient zinc removal over the entire inner wall of the furnace.

In addition, since the present invention has the nozzle built into the fluid spray header, troubles when the fluid spray header is moved up and down can be prevented.

(Embodiment) The present invention will be described below based on an embodiment shown in FIG.

Reference numeral 9 denotes a fluid spraying header (hereinafter abbreviated as "header") according to the present invention, which is inserted over the entire inner width of the galvannealing furnace, and a compressed fluid supply hose fed from a hose reel is connected to the outer end thereof. The fluid chamber formed inside the header 9 is divided into a left chamber 11 and a right chamber 12 by a partition plate 10.
The right chamber 12 is provided with fluid supply pipes 13 and 14, respectively. The fluid supply pipes 13 and 14 are connected to a supply source such as a compressed fluid supply hose with a joint or the like with one touch.

Reference numeral 15 is a large number of fluid injection holes arranged so as to face the furnace wall, and a nozzle 16 is incorporated therein.

Reference numeral 17 is a coupling fitting for connecting with a header lifting chain and the like, and 18 is a guide roller on the short side of the furnace inner wall.

The header of the present invention is constructed as described above, and when the fluid supply source has a sufficient supply amount enough to uniformly and efficiently remove the entire inner wall of the galvanile furnace, both fluid supply pipes 13 and 14 are provided. The fluids may be supplied at the same time.

On the other hand, when the fluid supply amount is limited, either one of the fluid supply pipes 13 or 14 is selected and the fluid is jetted on each side, so that the zinc deposited on the inner wall of the galvanneale furnace can be divided and removed. If the amount of compressed fluid supplied is further limited, the fluid chamber may be subdivided.

Further, in the present invention, since the header is formed into a substantially circular shape by incorporating the nozzle in the header, it is difficult for the header to be caught in the galvanneale furnace, and troubles can be further avoided.

(Effects of the Invention) As described above, according to the present invention, it is possible to prevent the zinc removal efficiency from decreasing regardless of the fluid supply capacity. Further, it is possible to avoid troubles when the header is moved up and down in the galvanneale furnace. Further, by dividing the fluid chamber in the longitudinal direction, it is possible to prevent the header from swinging when the fluid is ejected.

[Brief description of drawings]

FIG. 1 is a drawing showing an embodiment of the present invention, in which (a) is a front view, (b) is a sectional view taken along the line (a) in FIG. Sectional view, (d) is a sectional view taken along the line (i) in FIG. 2, (e) is a sectional view taken along the line (h) in (a), and FIG. Is. 9 is a header, 10 is a partition plate, 11 is a left chamber, 12 is a right chamber, 13 and 14 are fluid supply pipes, 15 is a fluid injection hole, 16
Is a nozzle.

Claims (2)

[Scope of utility model registration request] 1. A fluid spray header used in an apparatus for removing deposited zinc in a galvanneale furnace in which a large number of nozzles are arranged so as to face the inner wall of the galvanile furnace, and a fluid chamber formed inside the fluid spraying header, A fluid spraying header for a deposit zinc removing device in a galvanic furnace, characterized in that it is formed separately in the longitudinal direction of the header, and a supply pipe for jetting fluid is provided in each of the divided fluid chambers. 2. The fluid spray header for a deposit zinc removing device in a galvanneale furnace according to claim 1, wherein the nozzle is incorporated in the fluid spray header.