KR920003629B1 - Single or two-sided galvanizing plant - Google Patents

Abstract

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Description

One or two side zinc coating device

1 is a schematic longitudinal cross-sectional view of one side zinc coating state of a device according to the invention,

2 is a schematic longitudinal cross-sectional view of a double-sided zinc coating of the apparatus.

The present invention relates to an apparatus for performing zinc coating (or zinc plating) on one or both sides of a steel strip, the inside of which is filled with a protective gas gas and continuously moved to a molten zinc bath through a duct connected to a furnace. The seam is guided through a guide roll (or a turning roll) and optionally a support roll, in which the strip is placed in a zinc bath, and in one side zinc coating is arranged so as to be positioned on the top of the zinc bath in a housing hermetically flanged to the duct. The present invention relates to an apparatus in which a coating roll submerged in a zinc bath while guiding strips in the same direction as in double-sided zinc coating through at least one guide roll (or turning roll) is intended to cooperate with the guide roll.

Over the years, there has been an increasing demand for zinc-coated steel strips on one side, especially for use in bodywork sheets, thus increasing the need for production facilities for such strips. However, the demand for double-sided zinc-coated steel strips is still considerable, so modern coating equipment must be able to produce both types of coating strips, and the transition to single-sided or double-sided coatings should be made as quickly and as cheaply as possible. Is required.

An apparatus of the above kind for one and double sided zinc coatings has been proposed from DE-A 33 13 218. Although the device can satisfactorily perform one-sided and double-sided coatings, there is a problem that a series of conversion measures are required, which are expensive in terms of manpower and time, in order to switch from one process to another. Furthermore, it should also be taken into account that the production is substantially stopped because no strips are processed during the conversion.

In addition, one-sided and double-sided zinc coatings have been developed and are already proposed in EP-A 064 922, which allow the wide movement and pivoting of various parts of the device to carry out two process steps in the same device. However, the device has a very complicated mechanical and motion mechanism, which leads to a much longer start-up and downtime in the event of a device failure. This drawback also occurs when repairing, replacing or cleaning parts of the device.

Starting from such a known technique, the present invention is an apparatus for zinc coating one side or both sides of a continuously moving steel strip, which is simple in structure but can be quickly converted from one process to another even when the strip material is left in the apparatus. It is an object of the present invention to provide a device.

In order to achieve the above object, in the present invention, the flange connecting portion between the duct and the one-side zinc coating housing can be easily disassembled so that the housing has a double-sided flange connecting portion as the flange connecting portion of the housing during double-coating zinc coating. The guide roll support for zinc coating can be easily replaced.

Accordingly, the present invention is based on the exchange of complete "kits" for one- and double-sided zinc coatings, with each kit including a complete set of components required for each process step.

According to another advantageous feature of the invention, the housing is installed by flange connection to the duct so that the housing is open toward the duct and the zinc bath while surrounding the three sides of the strip, while the lower section of the housing is immersed in the zinc bath. . In this way, first, a certain airtight connection is ensured between the duct and the zinc bath leading from the furnace, and secondly, the withdrawal of the device part for conversion from one side zinc coating to two side zinc coating without cutting the strip. . According to another feature of the invention as another solution for this same purpose, the housing is formed in two parts having a separating surface extending in the same direction as the discharge direction of the strip. By separating the housing into two parts, the housing parts can be easily disassembled on both sides of the strip. According to another advantageous feature of the present invention, in the above case, a guide roll or rolls in one housing part and an air knife nozzle (or nozzle blade) for uniform coating thickness in the other housing part are detachably attached to each housing part. Is installed.

Preferably, the coating roll is mounted on a lever rotatably supported outside the housing. It is advantageous for this lever to be provided with a roll support which can optionally replace a stabilizing roll for double-sided zinc coating or a coating roll for one-side zinc coating. In this way, the device can be made simpler by allowing other mechanical parts to remain in the device and only replace the rolls.

According to a particularly advantageous feature of the invention, the flange constituting the flange connection with the duct is formed substantially perpendicular to the surface of the zinc bath and extends in the direction crossing the strip, while at the same time a lower portion thereof enters into the zinc bath. Extended. By doing in this way, the gaseous part of a housing or a flange connection part can be ensured, respectively, and the lower part of the housing part supported by the flange connection part can be opened, and this housing part can be separated upwards without removing a strip.

In the following, a configuration example of the present invention will be described by way of example based on the accompanying drawings.

1 shows a zinc bath W containing molten zinc. Above the zinc bath (W) and inside the zinc bath (Z) is shown an apparatus for coating one side of the strip (S), the device of which is locked in the zinc bath (Z) and the guide roll (3a). 3b) and the air knife nozzle 4 include a housing 2 provided therein. The coating roll 7 disposed at the free end of the lever 8 is rotated below the strip S adjacent to the guide roll 3b. The lever 8 can be pivoted about the pivot point 12 to such a point as to position the coating roll in the retracted position 7a. The housing 2 consists of two housing parts 2a, 2b which are flanged to each other, the junction separating the two housing parts 2a, 2b coincides with the discharge direction of the strip S, which is designated by reference numeral 1. It is stretched in the direction. On the left side of the drawing, the housing portion 2a is connected to the duct 5a via the flange connecting portion 6. The flange connection part 6 is extended in the direction perpendicular to the surface of the zinc bath Z, and so that a lower end portion thereof enters the zinc bath Z. The flange connection part surrounds the strip S in three directions, and the entire housing 2 which is open toward the zinc bath Z in its lower part is made to be gas-tight at the lower part thereof by the zinc bath Z. In the same way, the gas is sealed off at its lower open side.

In order to use the apparatus of FIG. 1 for the double-side zinc coating of continuous steel strips P as in FIG. 2, first loosen the flange connection part 6 and place the housing parts 2a and 2b therein. Separated together with the installed guide rolls 3a and 3b and the air knife nozzle 4, the support rolls 13 and the guide rolls 10 as shown in FIG. 2 instead of the housing parts 2a and 2b are shown. And a support 11 on which the housing portion 5b is installed. The coating roll 7 installed on the lever 8 is replaced with the support roll 9 and the support roll is rotated around the pivot point 12 to meet the purpose of double-side zinc coating. Take it to the location where it is. A pair of air knife nozzles 4 'to be used in connection with the double-sided zinc coating of FIG. 2 may be provided in a conventional manner at both sides of the discharge strip, as shown in the example shown, wherein the housing portion of FIG. (2b) The air knife nozzle 4 separated from the inside can be installed and used as one nozzle for such a double-sided zinc coating. The specific installation method of the double-sided zinc coating air knife nozzle 4 'is not related to the technical scope of the present invention, and thus description thereof will be omitted.

The housing part 5b disposed on the support 11 constitutes an extension of the duct 5a from the furnace to the inside of the zinc bath Z. Due to the position of the flange connection portion perpendicular to the zinc bath and the lower edge of the duct extending into the zinc bath, the housing part 5b surrounds the strip in three directions, and the enclosed space is sealed to the zinc bath Z side. At the same time, the flange connecting portion 6 is hermetically connected to the duct 5. Since the flange connection part 6 here is the same as the case of the housing parts 2a and 2b mentioned above, it can replace and install both housing parts modularly. The components of both devices are designed such that the strip to be coated remains in the device during the transition from one side zinc coating to two side zinc coating.

The present invention can be used for each process because it is possible to quickly switch from one process to another, while the cost of constructing the device is low, and a particular device element which is not used as a complete "kit" exchange can be easily repaired and repaired outside the device. Correspondingly prepared device elements can be replaced if required.

Claims (7)

A device for zinc coating on one or both sides of a steel strip filled with protective gas inside and continuously guided to a molten zinc bath through a duct connected to the furnace. Optionally guided through a support roll, the one-side zinc coating guides the strip in the same direction as the two-side zinc coating through at least one guide roll positioned in the upper part of the zinc bath in the housing hermetically flanged to the duct. At the same time, a coating roll immersed in the zinc bath cooperates with the guide roll and facilitates disassembly of the flange connecting portion 6 between the duct 5a and the housing 2 so that the housing 2 is coated during double-side zinc coating. ) Can be replaced by the support 11 of the guide roll 10 having the flange connection 6 such as that of the housing (2) One side or double side zinc coating device. The zinc bath according to claim 1, wherein the flange connection part 6 is opened toward the duct 5a and the zinc bath Z while surrounding the strips S and P in three directions. Apparatus characterized in that it is made through a housing portion (5b) installed on the support (11) to be locked. 2. The housing (2) according to claim 1, wherein the housing (2) is separated into two housing parts (2a, 2b), and the separating surfaces of these housing parts (2a, 2b) extend along the discharge direction (1) of the strip (S). The device characterized in that. 4. The air knife nozzle (4) according to claim 3, wherein the guide rolls (3a, 3b) are formed inside one housing portion (2a), and the air knife nozzle (4) for keeping the coating thickness constant inside the other housing portion (2b). An apparatus detachably attached to (2a, 2b). 2. Device according to claim 1, characterized in that the coating roll (7) is mounted on a pivot (8) which is rotatable outside the housing (2). 6. Device according to claim 5, characterized in that the lever (8) has a support of a double-sided zinc coating support roll (9), which can be replaced by a one-side zinc coating coating roll (7). The flange according to claim 1 or 2, wherein the flange constituting the flange connection 6 with the duct 5a extends in a direction substantially perpendicular to the surface of the zinc bath and in the direction crossing the strips S and P, and at the same time Apparatus characterized by extending into the zinc bath (Z).

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