JPH08370Y2 - Pickling pretreatment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a pickling pretreatment device for pickling equipment such as stainless steel strip.

<Prior Art> Scale of a rolled and heat-treated stainless steel strip (hereinafter referred to as a strip) is removed by pickling, and the surface is finished. As a pretreatment for this pickling, for example, the scale is chemically reacted by immersing the strip in a molten salt bath prepared by mixing NaOH, NaNO ₃ and NaCl and melting at 400-500 ° C to shorten the pickling time and the surface. We are trying to improve the glossiness of. This pretreatment is applied to strips after cold rolling of all steel types such as austenitic, ferritic and martensitic.

Such pre-pickling treatment is carried out by the apparatus shown in FIG. That is, for example, the strip S rolled into an ultra-thin plate of about 0.2 mm and heat-treated in a heating furnace (not shown) is cooled to 450 to 500 ° C. by the fog quench 60 and sent to the salt bath 10 via the asbestos roll 16. It In this salt bath 10, the strip S is immersed in a molten salt bath L, and guided and run by both salt floaters 11 for injecting the molten salt in a non-contact manner. At the outlet side of the salt bath 10, both jet nozzles of the air wiper 20 are run. The molten air adhering to the surface is removed by the hot air blown from 21 to reduce the film thickness. Then, the air floater 31
The strip S, which is guided in a non-contact manner by the water quench 70 and cooled to almost room temperature by the cooling water W of the water quench 70,
Tension is applied while being attracted to the suction roll 41 of the suction bridle 40 in a state where the surface is wet guided by the sink roll 71, is fed to the electric field pickling tank 90 via the centering roll 81, and the scale of the surface is To be removed.

<Problems to be Solved by the Invention> However, in the conventional apparatus, since the strip S having the friction coefficient lowered due to the molten salt adhering to the surface is in contact with the sink roll 71 of the water quench 70,
Scratch due to sliding with Syncroll 71 and Syncroll
If a foreign substance such as a molten salt crystal is caught between 71 and the like, a scratch or the like will occur, and the product value will be significantly reduced.

<Means for Solving the Problems> The structure of the pickling pretreatment device of the present invention for solving the above problems is such that a water quench is arranged on the inlet side of the pickling tank, and a salt bath is further provided on the inlet side of the water quench. In the pickling pretreatment device for the strip, in which the cooling water of the water quench is provided with an in-liquid floater for ejecting the cooling water to guide the strip in a non-contact manner,
Centering guides are provided at both ends of the submerged floater.

<Action> The strip running in the pickling pretreatment device floats from its guide surface by the cooling water ejected from the submerged floater when it is cooled by being immersed in the water quench cooling water.
It runs without contact with the submerged floater.

<Embodiment> An embodiment of the present invention will be specifically described below with reference to the drawings. The same members as those of the conventional device are designated by the same reference numerals, and a duplicate description will be omitted.

1 and 2 show the first embodiment of the present invention. First
As shown in the figure, the strip S cooled by the fog quench 60 passes through the salt bath 10, the water quench 5, etc.,
It is pickled in the electric field pickling tank 90. Here, the water quench 50 has a semi-cylindrical submerged floater 51 immersed in the cooling water W therein. As shown in FIG. 2, the submerged floater 51 is formed by forming a large number of jet ports 51a for jetting the cooling water W on a curved surface that guides the strip S, and the width thereof is the width of the strip S. The centering guides 52 are provided upright on both ends thereof. Then, it is connected to a pump (not shown) via a feed pipe 53, and this pump is connected to a discharge pipe 55 of the water tank 54.

Therefore, the cooling water W sent from the water tank 54 to the submerged floater 51 by the pump via the discharge pipe 55 and the inlet pipe 53 is jetted from the jet outlet 51a to guide the strip S in a non-contact manner. The cooling water W flows out substantially evenly between both the centering guides 52 and both ends of the strip S, and the gaps are evenly maintained to center the strip S during traveling.

Next, a second embodiment of the present invention will be described with reference to FIG. In this embodiment, a salt bath 110 having a semi-cylindrical salt floater 111 installed between a vertical heating furnace (not shown) and a cooling device 100 and an electrolytic pickling tank 90, and a submerged floater 51. And a water quench 50 in which is installed, and the same operation as the first embodiment is achieved.

<Effects of the Invention> As described in detail above, in the present invention, the submerged floater for injecting the cooling water into the cooling water of the water quench of the pickling pretreatment device to float and guide it from the strip guide surface is installed. As a result, the strip travels in the water quench without contact, so that the strip is free from scratches and push scratches and its quality is improved. Further, according to the present invention, since the centering guides are provided at both ends of the submerged floater, the cooling water flows out substantially uniformly between both centering guides and both ends of the strip, and the gaps thereof are evenly maintained so that the strip is Perform centering. In this way, the centering of the strip can be performed without contact, and the traveling of the strip can be stably maintained.

[Brief description of drawings]

FIG. 1 is a block diagram showing a pickling pretreatment apparatus according to a first embodiment of the present invention, FIG. 2 is a longitudinal sectional view showing a water quench, and FIG. 3 is a second embodiment of the present invention. FIG. 4 is a configuration diagram showing a pickling pretreatment device, and FIG. 4 is a configuration diagram showing a conventional pickling pretreatment device. In the drawing, 50 is water quench, 51 is a submerged floater, 52 is a centering guide, 90 is an electrolytic pickling tank, W is cooling water, and S is a strip.

Claims (1)

[Scope of utility model registration request] 1. A strip pickling pretreatment apparatus in which a water quench is disposed on the inlet side of a pickling tank and a salt bath is disposed on the inlet side of the water quench, wherein cooling water in the water quench is cooled water. And a centering guide provided at both ends of the submerged floater for injecting and guiding the strip in a non-contact manner.