JPH064066U - Pickling equipment for stainless steel strip - Google Patents

Abstract

(57) [Summary] [Purpose] When the steel strip is picked up by moving up and down the sink roll of the pickling tank for stainless steel strips or bypassed, the pickling solution adheres to the sink roll on the bypass side and Since the surface quality was deteriorated, this is prevented. [Structure] On the bypass side, a steel strip air spray device is provided on the sink roll entry side, and a water washing spray device and a drying air spray device are provided on the sink roll.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pickling apparatus for stainless steel strips, and more particularly to a pickling apparatus for stainless steel strips that can advantageously prevent surface defects from occurring on stainless steel strips due to changes in pickling conditions.

[0002]

[Prior art]

 As a method for removing the oxide scale formed on the surface of the stainless steel strip, it is common to remove it by pickling. As the pickling equipment, a series of pickling tanks containing pickling solutions such as sulfuric acid, hydrochloric acid, nitric acid, and nitric hydrofluoric acid are used.The pickling tanks are selected according to the type of steel such as ferrite, austenite, and martensite A stainless steel strip is pickled continuously by properly selecting a washing tank.

The pickling tank is selected as follows. As shown in FIG. 2, by lowering the sink rolls 2 and 2, the stainless steel strip 1 is immersed in the pickling solution 6 in a desired pickling tank 7, while the sink rolls 2 and 2 are raised. Thus, the stainless steel strip 1 is pulled up from the desired pickling solution 6. That is, the pickling path and the bypass are switched by the ascending / descending operation of the sink roll, whereby the pickling tank is selected according to the steel type.

[0004]

[Problems to be solved by the device]

 As described above, the method of immersing or bypassing the stainless steel strip in the pickling tank by elevating the sink roll has the following problems. 1) The pickling solution adheres to the raised sink roll, and this pickling solution causes a pickling solution pattern on the surface of the stainless steel strip that bypasses the pickling tank.

2) The pickling solution in the preceding pickling tank is brought into the raised sink roll by the stainless steel strip and adheres to the sink roll. This pickling solution may mix with the pickling solution in the pickling tank if the sink roll is lowered at the next change of pickling conditions, which may cause poor pickling. 3) When the pickling conditions are changed due to the change of steel type, a dummy coil may be used. In this case, the pickling solution adhering to the sink roll is transferred to this dummy coil and transferred to the above-mentioned steps 1 and 2). Although the problem can be solved, since the dummy coil is not pickled, oxide scale remains on the surface of the dummy coil, and this oxide scale adheres to and accumulates on the sink roll and stains the sink roll. This will cause flaws in the obi.

It is an object of the present invention to provide a pickling device for stainless steel strip which solves the above problems.

[0007]

[Means for Solving the Problems]

 The present invention comprises a pickling tank having a pickling solution inside, and a descending operation to immerse the stainless steel strip in the pickling solution in the pickling tank to form a pickling path, and an ascending operation to move the stainless steel strip to the above In a stainless steel strip pickling device that has a sink roll that pulls up from the pickling solution in the pickling tank to form a bypass, the pickling solution adhering to the stainless steel strip is placed on the inlet side of the sink roll at the bypass position. In addition to the air spray device for removing, a water spray device for cleaning the surface of the sink roll and an air spray device for drying the surface of the sink roll are installed near the sink roll. It is a pickling device.

[0008]

[Action]

 In the present invention, an air spray is provided on the sink roll side to blow away the pickling solution adhering to the steel strip so that the pickling solution is not brought in and the sink roll surface is sprayed with water. The pickling solution and dirt adhering to the roll are removed by the above, and the roll surface is dried by an air spray after the water washing spray, so the pickling condition is changed from dipping in the pickling tank to the bypass side of the pickling tank. When this happens, the steel strip on the bypass side will not have a pattern, and the roll surface can be cleaned quickly, enabling quick changes in pickling conditions.

[0009]

【Example】

 FIG. 1 shows, as an embodiment of the present invention, a sink roll 2 of a pickling tank equipped with a water washing spray 5 and an air spray 4 and an acid spray removing air spray 3 on the inlet side of the sink roll 2. It is a drawing shown. The air spray 3 may be omitted for the sink roll on the inlet side of the pickling tank.

[0010] when elevated San'araiso sink roll, washed with water roll surface spray pressure 4.0 kg / mm ^2, and washed about 2 minutes with an air spray pressure of 10.0 kg / mm ² approximately. By cleaning, the pickling solution brought into the roll surface and the pickling solution on the roll surface are removed, the pattern of the steel strip on the side of the pickling tank bypass is eliminated, and the pickling can be done under the conditions of the immersion side to the last minute. It was also possible to prevent the scale remaining on the dummy coil.

[0011]

[Effect of device]

 In the present invention, by spraying the sink roll for changing the pickling condition, the liquid is prevented from being brought in when the sink roll is raised, so that the pattern of the steel strip on the bypass side of the pickling tank does not occur. In addition, since the carry-in of the liquid can be quickly removed, a quick change of the pickling condition is also possible.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a pickling apparatus according to the present invention.

FIG. 2 is a configuration diagram of a conventional pickling apparatus.

[Explanation of symbols]

 1 strip 2 sink roll 3 air spray device for pickling solution removal 4 air spray device for sink roll drying 5 water spray device for sink roll cleaning 6 pickling solution 7 pickling tank

Claims (1)

[Scope of utility model registration request] 1. A pickling tank having a pickling solution inside, and a descending operation to immerse a stainless steel strip in the pickling solution in the pickling vessel to form a pickling path, and an ascending operation to remove the stainless steel strip. In a pickling device for a stainless steel strip having a sink roll that is pulled up from the pickling solution in the pickling tank to form a bypass, the pickling solution adhering to the stainless steel strip is placed on the inlet side of the sink roll at the bypass position. The pickling of stainless steel strips is characterized in that an air spray device for removing is disposed, and a water spray device for cleaning the surface of the sink roll and an air spray device for drying the surface of the sink roll are arranged in the vicinity of the sink roll. apparatus.