JPS6124472B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention provides rolled strips (hereinafter referred to as strips).
The present invention relates to a pickling device for continuously pickling and, in particular, to an immersion type continuous pickling device.

Conventionally, in this type of pickling equipment, as shown in Figure 4, the transfer strip is dipped under its own weight into an acid solution stored in a pickling tank, and the oxidized scale on the surface of the strip is peeled off and removed by the chemical reaction of the acid solution. ing.

In this pickling equipment, the acid solution is heated to speed up the reaction rate and shorten the pickling time. A so-called boundary layer is formed, which makes it difficult to obtain a pickling speed (pickling effect) that matches the strip transfer speed, and the pickling tank must be made longer or multiple pickling tanks arranged in series are used. The residence time is ensured to achieve the desired pickling rate. (See FIGS. 4a and 4b) This has resulted in the disadvantage that the pickling equipment becomes long and very expensive.

The present invention has been made in order to eliminate the above-mentioned drawbacks, and the strip immersed during pickling is transported in a constant posture along the length of the pickling tank by a strip guide device, and the strips are provided on both sides of the pickling tank. The object of the present invention is to provide an immersion type continuous pickling apparatus which can improve the pickling speed by destroying the boundary layer between the strip and the acid solution using a stirring body placed close to each other without contact.

Below, the example will be explained with reference to the drawings.
In the figure, 1 is a pickling tank, and 2 is an acid solution stored in the pickling tank 1.

3 indicates the strip to be pickled. 4a,
4b is a strip guide wheel device installed at both ends of the pickling tank 1, and a part of the outer periphery of the guide wheels 4', 4b' of the both guide ring devices is located in the acid solution.
The strip 3' guided by a' and 4b' moves approximately horizontally in the acid solution.

Reference numeral 5 denotes stirring protrusions arranged close to both the upper and lower surfaces of the strip 3' between the guide wheels 4a' and 4b', and the protrusions 5 protrude from a frame 6 fixed in the pickling tank 1 in a staggered arrangement. .

The present invention is configured as described above.

Next, the movement path of the strip and the pickling action will be described. The strip 3 is introduced into the acid solution 2 at the inlet strip guide ring 4a' of the pickling tank 1, and then passed between the stirring protrusions 5, 5 formed by immersion between both the strip guide wheels 4a', 4b'. After passing through, the pickling tank 1 is guided out of the tank by the outlet guide wheel device 4b.

The oxidized scale on the surface of the strip 3 is gradually peeled off and removed by the chemical action of the acid solution during movement in the acid solution, but especially when passing between the stirring protrusions 5, the oxidized scale is removed between the strip 3' and the tip of the stirring protrusion 5. 〓 is both guide wheels 4
The strip is always kept at a constant distance by the guiding action of a' and 4b', and the acid solution covering the surface of the strip is well stirred by the stirring protrusions 5, 5.

For this reason, a boundary layer tends to form between the strip surface and the acid solution (a layer of acid solution that moves alongside the strip as the strip moves through the acid solution).
Since the acid is broken down and diffused, the strip 3' is always in contact with fresh acid solution, and the descaling action is effectively carried out. In addition, since the stirring protrusions 5, 5 are arranged in a staggered manner, the acid solution covering the surface of the strip is stirred and the scale peeled off from the surface of the strip is effectively fluidized and discharged. Will not cause scratches if hit.

As described above, according to the present invention, the pickling of the strip can be carried out extremely effectively, so that the pickling apparatus can be downsized, which is extremely effective in reducing equipment costs and equipment installation area.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view of the immersion type continuous pickling device according to the present invention, Fig. 2 is a side sectional view taken along the line in Fig. 1, Fig. 3 is an enlarged perspective view of section A in Fig. 1, and Fig. 4. a and b are explanatory diagrams showing a conventional example. 1... Pickling tank, 3, 3'... Strip, 4
a', 4b'... Strip guide ring (strip guide device), 5... Stirring protrusion (stirring body).

Claims (1)

[Claims] 1. In the treatment solution, a strip guide device that moves the strip in a substantially constant state along the length of the pickling tank and a staggered stirring body arranged in a staggered manner, facing both sides of the immersed strip and close to each other in a non-contact manner, are provided. Features: Immersion type continuous pickling equipment.