JP2668846B2 - Method and apparatus for removing deposits on immersion roll - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a substance (metal, rust, etc.) adhering to the surface of a dipping roll (sink roll, snap roll, etc.) of a production line for plating a molten metal such as Zn, Sn, Al or the like on a steel plate or the like. ) And a removing device.

[0002]

2. Description of the Related Art Generally, methods for removing deposits on a roll surface in a hot-dip metal plating bath are disclosed in Japanese Utility Model Publication No. 2-48418, Japanese Patent Application Laid-Open Nos. 61-133369 and 61-139658. A method using a mechanical scraper, that is, a method in which a scraper is disposed on the roll surface, and the adhered material is scraped and removed by rotating the roll while controlling the pressing pressure of the scraper, or disclosed in Japanese Utility Model Laid-Open No. 4-78270. As described above, there is one in which a rubber roll provided with a small roll of non-woven fabric is arranged on the surface of the roll to transfer and remove the adhered matter.

[0003] These are removal methods in a line. On the other hand, as removal methods in off-line maintenance, removal methods in which tapping and shaking work (keren work) by hand and immersion in a pickling tank (dough pickling) are common. . As a conventional pickling method, there is a method in which an acid solution is put in a tank, an object is submerged in the tank, left for a long time, and then lifted and washed.

[0004]

However, in the conventional method of removing the extraneous matter by hand as a method for removing extraneous substances by hand, the manual operation requires manual labor, which requires much labor and also causes environmental problems such as dust generation. is there. In addition, in the pickling method, the adhered substances falling off the surface react with the acid solution again because the object is immersed in the tank, and the acid solution is consumed until the reaction is completed, which leads to a large increase in cost. Further, since the liquid and the roll are in static contact with each other, the reaction speed is slow and a long working time is required.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method and an apparatus for removing immersion roll deposits, which can minimize the consumption of an acid solution and can quickly react in an oxidative removal method in order to solve these problems.

[0006]

In order to solve the above problems, the present invention employs an acid or alkali washing and removing system. Specifically, a dipping roll in a molten metal plating bath is taken off-line, While rotating the roll, a cleaning liquid having a dissolving power for the adhered substance is sprayed to dissolve and peel off the adhered substance, and the separated adhered substance is separated from the cleaning liquid. A rotating roller and a rotary drive roller for supporting the immersion roll on a tank which is a holding and holding a cleaning liquid, and a shower nozzle of the cleaning liquid pumped up from the tank is provided above the supported immersion roll. A dipping roll characterized in that a catching net is provided between the dipping roll and the upper surface of the cleaning liquid in the tank for receiving the deposits separated from the dipping roll. It is the removal apparatus of the kimono.

[0007]

According to the present invention, 1) a cleaning solution, for example, an acid solution is showered,
The liquid constantly flows on the roll surface, so that the reaction speed is increased and the working time can be shortened. 2) Deposits removed by the shower do not directly enter the tank, but are received by the trapping net before being discharged arbitrarily to the outside of the system. The consumption of the cleaning solution, for example, the acid solution is eliminated, which leads to cost reduction. 3) Since the roll rotation mechanism is provided, the roll surface is evenly dipped in the cleaning liquid and uneven removal is eliminated.

[0008]

EXAMPLE A concrete structure of the pickling apparatus and its operation will be described with reference to an example shown in FIGS. FIG. 1 is a side sectional view of a cleaning apparatus according to the present invention, in which a roll 1 to be cleaned includes a rotary roller 9 and a rotary drive roller 10 mounted on a roll holder 3 on a column 13 installed in a tank 2. A collecting net 5 is provided between the roll 1 to be cleaned and the upper surface of the cleaning liquid 6 in the tank via a collecting net receiver 4 which is supported and supported on the column 13 and receives the adhered substances separated therefrom.

The mesh of the trapping net 5 acting as a filter is
50 μm or less is desirable. Further, the cleaning liquid, for example, the acid liquid 6 is filled up to the level of the lower surface of the collecting net 5, is sucked by the circulation pump 7, is jetted from the shower nozzle 8, and can be uniformly showered on the surface of the roll 1. The roll 1 is supported by a rotary roller 9 and a rotary drive roller 10 provided on a roll cradle 3 and is rotatable by a drive motor 11.

FIG. 2 is a plan view of the device of the present invention, in which the collecting net 5 is arranged to be larger than the roll 1 and can be arbitrarily attached and detached upward by removing the roll 1. Of course, it is also possible to adopt a structure in which the roll 1 is installed and inserted into or out of the front or rear. FIG. 3 shows an example of the drive system of the roll 1, and the roll shaft 12 is supported by the rotary roll 9 and the rotary drive roll 10, and the roll 1 can also be rotated by the rotation of the drive roll 10.

After a cleaning solution, for example, an acid solution has been used for a certain period of time, if its efficacy is reduced, it may be replenished or replaced entirely.
By the way, when the deposits on the sink roll used for the hot-dip galvanizing were removed under the following conditions with the apparatus of the present invention, the processing time was 6 to 4 hours as compared with the conventional example which was immersed in the same cleaning solution. And the amount of acid solution used has been halved.

Washing liquid: Phosphoric acid solution of pH 2-3 Roll surface area: 5.5 m ² Spraying amount: 100 l / min Number of collection net replacement: 1 time / roll Roll rotation speed: 1 rpm or less

[0013]

INDUSTRIAL APPLICABILITY The present invention activates the reaction between the cleaning liquid and the deposit by showering the cleaning liquid such as an acid liquid,
Removal of deposits can be performed quickly. Further, since the adhered and removed matter is received by a collecting net such as a filter and discharged outside the system, wasteful consumption of the cleaning liquid such as an acid solution in the tank is eliminated, and the use cost of the cleaning liquid can be reduced.

Furthermore, because of the surface showering, the amount of the acid solution used is reduced by half compared to immersion while the inner surface that is not required to be removed is left as it is, and since the roll is rotated, removal unevenness is eliminated and accuracy can be improved.

[Brief description of the drawings]

FIG. 1 is a side sectional view of the device of the present invention.

FIG. 2 is a plan view of the device of the present invention.

FIG. 3 is a perspective view showing a driving unit of the device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Roll (roll to be washed) 2 Tank 3 Roll receiving stand 4 Collection net receiver 5 Collection net 6 Cleaning liquid (acid solution) 7 Circulation pump 8 Shower nozzle 9 Rotary roller 10 Rotary drive roller 11 Drive motor 12 Roll shaft 13 Prop

Claims (2)

(57) [Claims] 1. A dipping roll in a molten metal plating bath is taken off-line, and while the roll is rotated, a cleaning liquid having a dissolving power for adhering substances is sprayed to dissolve the adhering substances.
A method for removing deposits on a dipping roll, characterized in that the deposits are stripped and the stripped deposits are separated from the cleaning liquid. 2. A rotary roller and a rotary drive roller for supporting an immersion roll on a tank serving as a holding and receiving tray of the cleaning liquid, and a shower nozzle for the cleaning liquid pumped up from the tank is provided above the supported immersion roll. Provided,
An apparatus for removing deposits on a dipping roll, further comprising a catching net provided between the dipping roll and an upper surface of the cleaning liquid in the tank for receiving deposits separated from the dipping roll.