JPS6237385A - Pickling tank in continuous pickling line - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to Sogetsu's hot coil for cold stripping (
Hereinafter, it will simply be referred to as a strip. ) This relates to a pickling tank in a continuous pickling line for removing scale formed on the surface.

[Conventional technology]

In the conventional pickling tank, as shown in Fig. 5, the pinch roll 9
While keeping the exit speed of the strip 4 constant, the strip 4 is
The zero entry speed was adjusted to keep the catenary in the tank constant, and the immersion time of the strip in the acid solution and the processing speed remained constant.

[Problem that the invention seeks to solve]

However, the acid solution immersion time is too long for strips with easily soluble scale, which not only dissolves the bare metal after descaling and impairs the surface quality, but also increases acid solution consumption and reduces productivity. There was an inconvenience that it was bad.

[Means for solving problems]

The pickling tank in the continuous pickling line of the present invention is provided with pressure deflector rolls on the inlet and outlet sides of the pickling tank tank, and a dip roll that immerses and supports the strip in an acid solution between the deflector rolls, and the dip roll The feature is that at least one of the strips is movable up and down, and by adjusting the length of the strip immersed in the acid solution by raising and lowering the dip roll, the immersion time in the acid solution (descaling time) can be adjusted according to the properties of the scale. It can be selected arbitrarily.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

In the figure, 1 is a pickling tank, and there are multiple tanks (4 in the example).
They are arranged in rows.

Reference numeral 2 denotes deflector rolls, which are arranged on the inlet and outlet sides of each tank 1. One roll is shared between tanks 1.

Reference numeral 3 denotes dip rolls, which are disposed on the inlet and outlet sides of each tank 1 in order to immerse the strip 4 in the acid solution 5 in each tank 1.

Reference numeral 6 denotes a lifting device (a cylinder in the embodiment), which is provided on the fixed frame 7.

The dip roll 3 installed in the tank 1 at the outlet end of the pickling tank is
Reference numeral 09, which is supported so as to be able to rise and fall by the lifting device 6 via a bearing 8 attached to its shaft end, is a pinch roll for threading the strip, and is disposed on the outlet side of the tank 1 at the outlet end of the pickling tank. It also serves as a deflector roll.

Note that the lifting mechanism for the dip roll 3 is provided on the inlet and outlet sides of the tank 1 at the outlet end of the pickling tank, but it can be provided in any tank 1, not just the tank 1 at the outlet end of the pickling tank. Alternatively, it may be provided in all tanks 1. Further, it may be provided on either the inlet side or the outlet side of the tank 1.

[For production]

As shown in FIG. 6, when the dip roll 3 is lowered to the lowering limit position (second illustrated position A) by the lifting device 6, the strip 4 passing through the pickling tank is
The length of immersion in the acid solution 5 in each tank 1 is 1-h as shown in the second figure.
It becomes. The descaling time at this time is the longest.

As shown in Figure 2, when one dip meal 3 is raised by the lifting device 6 from position A to position B1 and then to the rising end position C, the strip 4 in the tank 1
The length of immersion in the acid solution becomes short from the longest tm to tBXtC.

Further, when both dip rolls 3 are raised to the rising end position as shown in Fig. 4, the length of the strip 4 immersed in the acid solution in the tank 1 becomes zero, and it is also possible to not use the tank 1. .

Therefore, by adjusting the immersion length of the strip 4 in the acid solution in the range of 0 to t in each tank provided with a lifting mechanism for the dip roll 3, the immersion time (descaling time) of the strip 4 in the acid solution can be adjusted. The length can be selected depending on the nature of the scale, such as a shorter length for strips with scale that easily dissolves, and a longer length for strips with scale that is difficult to dissolve.

〔Effect of the invention〕

As described above, in the present invention, when a strip is immersed and supported in an acid solution between deflector rolls by a dip roll,
Since the length of the strip immersed in the acid solution can be adjusted arbitrarily by raising and lowering at least one of the dip rolls, it is possible to select the descaling time according to the properties of the scale, thereby obtaining a pickled strip with excellent surface quality. At the same time, it is possible to obtain economical operating conditions in which the reaction between the acid solution and the strip metal is prevented and the amount of acid solution consumed is minimized.

[Brief explanation of drawings]

Figure 1 is an overall schematic diagram showing one embodiment of the present invention, Figure 2 is an enlarged view of the support part of Figure 1, Figure 3 is an enlarged view of Figure 9, and Figure 4 is a diagram of Figure 2 for detailed explanation of the present invention. The old sectional view, the overall schematic diagram 9, and FIG. 5 are the overall schematic diagram p showing the conventional example. 1... Tank, 2... Deflector roll, 3... Dip roll, 4... Strip, 5... Acid liquid, 6...・・Lifting device, 7
...Fixed frame, 8...Bearing, 9.
...Pinch roll. Many continuations from page 31 Akira Tsuyoshi Sasaki Oaza Hikari 3 Railway Station, Kashima-cho, Kashima City

Claims (1)

[Claims] A pickling tank is characterized by being provided with deflector rolls on the entry and exit sides of the tank, and a dip roll for immersing and supporting the strip in the acid solution between the deflector rolls, and one of the dip rolls is provided so as to be able to rise and fall. A pickling tank in a continuous pickling line.