JPH1112772A - Continuous acid-pickling equipment for steel sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the perfect removal of rinse water even in the case of a checkered steel sheet without bringing about drastic rising of the cost and lowering of the production efficiency by arranging an exclusive auxiliary heating device to the checkered steel sheet just before the inlet side of a drier in a continuous acid-pickling equipment commonly used to a flat steel sheet and the checkered steel sheet. SOLUTION: After acid-pickling the steel sheet S continuously traveling through an acid pickling vessel 1, warm water is supplied on the surface of the steel sheet S with a rinse device 2 to rinse the stuck acid-pickling solution. Successively, the steel sheet is interposed from the upper and the lower sides with wringer rolls 3 to wipe off the rinse water. Further, the remaining water is blown off with air wipers, and after squeezing the water with finger rolls 5, the steel sheet is heated with a drier 7 and dried and wound with a winding reel through a deflector roll 9. Just before the inlet side, and if necessary, further at the outlet side of the drier 7 in the continuous acid-pickling equipment commonly used to the flat steel sheet and the checkered steel sheet, the auxiliary heating devices 6, 8 are arranged and worked only in the case of continuously acid-pickling the checkered steel sheet. By this constitution, even the water invaded in the recessed part of the checkered steel sheet is perfectly removed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous pickling facility for both flat and striped steel sheets, and more particularly, to a method for completely removing rinse water adhering to the surface of a striped steel sheet. About technology.

[0002]

2. Description of the Related Art In a conventional continuous pickling equipment for steel sheets, draining after rinsing is generally performed by a ringer roll, and after this draining, it is general to dry with a drier and wind up a coil. And in the case of a flat steel plate, water on the surface is sufficiently removed by draining with a ringer roll,
Drying with a dryer does not take much time. However, in the case of a striped steel sheet having an uneven surface, it is difficult to completely remove the water that has entered the recess with a ringer roll.

Therefore, in the case of a striped steel plate, a dryer having a high drying ability is used, or the line speed is reduced to increase the drying time in the dryer. Further, as disclosed in Japanese Patent Application Laid-Open No. 6-65767, it has been proposed to blow high-pressure air to blow off water that has entered a recess.

[0004]

However, in the method using a dryer having a high drying capacity, the equipment becomes large and the cost is greatly increased. Is overspec for flat steel. Further, it is not preferable to reduce the line speed and lengthen the drying time in the dryer because the production efficiency is reduced. Furthermore, in the method of blowing high-pressure air, there is a possibility that the blown water scatters around and wets the board after draining.

[0005] The present invention has been made in view of such problems of the prior art, and in a continuous pickling facility for both flat and striped steel sheets, especially in the case of striped steel sheets, the complete rinsing water is completely removed. An object of the present invention is to provide one that can be removed and does not cause a significant increase in cost and a decrease in production efficiency.

[0006]

Means for Solving the Problems In order to solve the above problems, the continuous pickling equipment for steel sheets according to the present invention comprises at least:
In a continuous pickling facility that is equipped with a pickling tank, a rinsing device, a ringer roll, and a dryer in this order, and is used in common for flat and striped steel plates, just before the dryer enters, assists only in continuous pickling of striped steel plates. A heating device is provided.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram showing a continuous pickling facility of this embodiment. A rinsing device 2, a ringer roll 3, an air wiper 4, a ringer roll 5, an auxiliary heating device 6, A dryer 7, an auxiliary heating device 8, and a deflector roll 9 are installed in this order.

[0008] The rinsing device 2 supplies hot water to the surface of the steel strip S to wash away the acid adhered in the pickling tank 1.
The temperature of the hot water is set to, for example, 80 to 100 ° C. The ringer rolls 3, 5 sandwich the steel strip 5 from above and below at a predetermined pressure to squeeze liquid on the surface. Air wiper 4
The high-pressure air is blown toward the surface of the steel strip S to blow off water adhering to the surface, and the temperature of the air is, for example, 100 ° C. or more.

As the auxiliary heating devices 6 and 8, for example, gas burners are installed. The heating temperature is set according to the material of the steel strip S to be processed. For example, the temperature is about 300 ° C. or less for ordinary steel, and about 400 ° C. or less for stainless steel.

The drying capacity of the dryer 7 is such that the flat steel sheet is sufficiently dried at a normal line speed. The entry roll in the dryer 7 is a heat-resistant rubber lining roll so that it does not deteriorate at the temperature of the steel strip S heated by the auxiliary heating device 6. In addition, a heat-resistant rubber lining roll is used so that the surface of the deflector roll 9 does not deteriorate at the temperature of the steel strip S heated by the auxiliary heating device 8.

When the steel strip S is a flat steel plate, this equipment is operated without operating the auxiliary heating devices 6 and 8. Thereby, the flat steel sheet S pickled in the pickling tank 1 and rinsed by the rinsing device 2 is blown with high-pressure air by the air wiper 4 after the rinsing water is wiped off by the ringer roll 3, Water adhering to the surface of the steel sheet S is blown away. The water scattered on the surface of the flat steel sheet S by the air wiper 4 is squeezed out by the ringer roll 5. Then, the flat steel sheet S that has exited the ringer roll 5 is
And is taken up from the deflector roll 9 to the take-up reel.

When the steel strip S is a striped steel plate, the auxiliary heating devices 6 and 8 are operated to operate this equipment. As a result, the striped steel sheet S pickled in the pickling tank 1 and rinsed by the rinsing device 2 is sprayed with high-pressure air by the air wiper 4 after the rinsing water is wiped off by the ringer roll 3 and striped. Attached to the surface of the steel sheet S (in particular,
The water (entering the recess) is blown away. The striped steel sheet S that has exited the ringer roll 5 enters the auxiliary heating device 6 and is heated to a predetermined temperature, and the heating causes water remaining in the concave portions of the striped steel sheet to evaporate. After that, it enters the dryer 7 and is dried, and further enters the auxiliary heating device 8 and is heated to a predetermined temperature. By this heating, the water remaining in the recesses of the striped steel plate remaining by the drying in the dryer 7 evaporates. I do.

The flat steel sheet S that has exited the auxiliary heating device 8 is taken up from the deflector roll 9 toward the take-up reel. Therefore, according to this equipment, the auxiliary heating devices 6 and 8 are installed in the conventional flat steel plate equipment, and the auxiliary heating devices 6 and 8 are operated only during the processing of the striped steel plate. Even though, the rinsing water can be completely removed. Also,
Since there is no need to install a dryer having a high drying capacity, there is no significant increase in equipment costs and space is saved.

Further, since it is not necessary to reduce the line speed, the production efficiency is improved. Specifically, in the case of the conventional equipment without the auxiliary heating devices 6 and 8, 20 m
The line speed, which was set to pm, could be increased to 30 mpm.

In this embodiment, the auxiliary heating devices 6 and 8 are installed immediately before the entrance of the dryer 7 and immediately after the exit. However, in the facility of the present invention, the auxiliary heating device on the exit of the dryer 7 is provided. The device 8 is not essential.

The installation of such an auxiliary heating device is as follows.
The present invention can also be applied to the inlet and outlet sides of a dryer provided on the outlet side of the cooling zone in continuous annealing of stainless steel. Thus, in the case of a striped steel plate that is shot blasted after continuous annealing, it is possible to avoid a problem of shot blasting caused by remaining water of cooling water entering the shot blast and solidifying shot grains. In addition, it is possible to avoid a problem that the shot grains are clogged and hardened in the concave portions of the striped steel plate.

[0017]

As described above, according to the continuous pickling equipment for both flat and striped steel sheets of the present invention, the rinsing water can be completely removed, especially for striped steel sheets. In addition, the cost is not significantly increased as compared with the conventional equipment, and the production efficiency can be increased.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a continuous pickling facility corresponding to one embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 pickling tank 2 rinsing device 3 ringer roll 4 air wiper 5 ringer roll 6 auxiliary heating device 7 dryer 8 auxiliary heating device 9 deflector roll S steel strip (striped steel sheet, flat steel sheet)

Claims (1)

[Claims] 1. A continuous pickling facility for a flat steel plate and a striped steel plate provided with at least a pickling tank, a rinsing device, a ringer roll, and a dryer in this order. A continuous pickling facility for steel sheets, comprising an auxiliary heating device that is operated only in the case of (1).