JPS62133089A - Continuous pickling device for steel strip - Google Patents

Abstract

PURPOSE:To prevent floating up of a steel strip and eventually to immerse the steel strip in a pickling soln. so as to improve pickling performance by disposing at least a pair of gates in a pickling cell. CONSTITUTION:>=1 Pairs of gates 12 are disposed in the pickling cell so as to sandwich the steel strip from above and below. The gates 12 has nozzles 13 worked to a cushion shape. The pickling soln. 4 is increased in pressure by a pump 17 and is supplied through a piping 15 with a valve 16 to headers 14. The soln. is sprayed in the form of jets to the steel strip 15 from the nozzles 13. A pressure pocket region 18 of a high pressure is formed to the intermediate part of the nozzles 13 by the jets of the pickling soln. from the cushion type nozzle 13 having an angle and the steel strip 5 is passed to the central part between the gates 12 by such region 18.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a continuous pickling device for strip steel, which is applied to process equipment of iron-making machinery.

[Conventional technology]

A conventional general pickling tank is shown in FIG. In Fig. 5, 1 is the pickling body, 2 is the partition, 3 is the cover, 4 is the acid solution, 5 is the steel strip, 6 is the inlet side support roll, and 7 is the acid solution that has adhered to the surface of the steel strip. 8 is a water washing tank for washing the pickled steel strip with water. The operation of this conventional pickling tank will be explained based on FIGS. 5 and 6.

Figure 6 is an enlarged detailed view of a part of Figure 5, showing the first pickling tank, where 9 is a welded steel can body, 10 is made of acid-resistant porcelain bricks, and 11 is installed on the top of partition 2. This is a skit for supporting steel bands.

In Fig. 5 and Fig. 6, the steel strip 5 enters the first tank of the pickling tank from the inlet side support roll 6 as indicated by the arrow, and passes through the acid solution 4 stored in m. Make a catenary curve, progress and partition! It passes over the strip supporting skit 11 installed at the stop of 72 and enters the second divided tank. In this division m, the acid solution moves in a catenary curve as in the first tank,
Passing through the sixth division tank and fourth division N, which continues in the same manner,
In this way, while the steel strip 5 passes through the acid solution 4, the oxide film on its surface is sequentially removed, and then passes through water in the washing tank 8 and is washed with water.

sent to the process.

[Problems that the invention attempts to solve]

Recently, pickling lines have been made faster in order to improve productivity in connection with the rolling line. As the speed of pickling lines increases, the following problems have arisen.

(a) In the process shown in FIG. 7, the steel strip 5 floats and is not immersed in the V acid solution 4, reducing the pickling performance.

(b) As shown in FIG. 8, there are many exposed stress points of the steel strip 5 and the exposed length t is also long, so the length of the pickling tank becomes long as a whole, and the construction cost increases.

(C1 The amount of wear of the strip supporting skid 11 shown in Figs. 7 and 8 increases and it is necessary to replace it in a short period of time. However, the material cost and replacement cost of the strip steel supporting skid 11 are increased, and the running cost is reduced. It gets expensive.

〔the purpose〕

The present invention solves problems (a) to () in the conventional pickling tank described above.
The object of the present invention is to provide a continuous pickling device for steel strips that solves the problem C).

[Means for solving problems]

The present invention, as a means for achieving the above object, consists in providing at least one pair or more of special gates in the pickling tank 173vc. That is, the present invention has a cushion-shaped nozzle, and this nozzle is provided with at least one pair of gates configured to jet the pickling liquid as a jet onto the rainbow steel strip, and the strip 5If4 is sandwiched between the nozzle and the nozzle. A continuous method for strip steel, characterized in that the pickling tank is divided into a plurality of tanks by the gate, or the gate is provided in a pickling tank divided into a plurality of tanks by a partition. This is a pickling device.

〔Example〕

Hereinafter, the present invention will be explained in detail based on FIGS. 1 to 4.

FIG. 1 is a vertical cross-sectional view of a continuous pickling device showing an embodiment of the present invention, FIG. 2 is an enlarged detailed view of the gate portion in FIG. 1, and FIG. 5 is a gate in the device of the present invention. It is a figure which shows the relationship between the clearance (do) between and a steel strip, and a fluid reaction force (F). Further, FIG. 4 is a longitudinal sectional view of another embodiment of the present invention.

In Figures 1 and 2, the same parts as in Figures 5 to 8, which are explained as conventional pickling tanks, are given the same reference numerals and have the same functions, so their explanations are omitted here. To explain the differences, 12 is a gate, 15 is a nozzle, this nozzle 15 is a slit cut in the header 14 that constitutes the gate 12, 15 is a pipe,
16μsho, 17 is a pump.

In the present invention, as shown in FIG.
A gate 12 is provided in the workpiece that is inserted from below. As shown in FIG. 2, this gate 12 has a cushion-shaped nozzle 15 (a slit cut in the header 14).
The pickling liquid 4 is pressurized by a pump 17, is supplied to the pedal 14 through a pipe 15 with a valve 16, and is placed in a pickling tank containing 4 ft of pickling liquid. 5. Sprayed in a hegemetal flow. And the second
As shown in the figure, an angled cushion-shaped nozzle 16
A high-pressure pressure pocket region 18 is formed in the middle part of the nozzle 16 by the acid pickling g jet, and the rainbow steel strip 5 is passed through this pressure pocket region 18 in the center between the gates 12.

In this pressure pocket region 18, the gate 1 shown in FIG.
Considering the relationship with fluid reaction force (Fl) against the clearance (d) between gate 1 and gate 12, the fluid reaction force becomes larger as the steel strip 5 approaches gate 12.
The steel strip 5 never comes into contact with the steel strip 2.

In Fig. 3, F: Force acting on Teiharu when the steel strip is at an arbitrary position Fo; Force d acting on the steel strip when the steel strip is located at the center between the gates; The distance between the steel strip and the gate when is at an arbitrary position do;? It shows the distance between the steel strip and the gate when the J steel is located at the center between the gates.

Figure 4 shows another embodiment of the present invention, in which the gate itself is constructed to separate the pickling tanks. It shows.

〔effect〕

As described in detail above, the present invention has at least one pair of gates disposed in the pickling tank, so that floating soil on the steel strip can be prevented from peeling off. is immersed in the pickling solution, resulting in the effect of preventing a decline in pickling performance.

Furthermore, since the present invention has a structure in which a gate is installed in the pickling tank and the pickling tank is divided into a plurality of tanks by working on this gate, the exposed portion Pfr of the strip steel is at the entrance of the pickling tank. Since the steel strip is only exposed at the machining exit, there is no other way to expose the steel strip.
This produces the effect that the length of the pickling tank can be shortened.

Furthermore, the present invention has remarkable effects such as eliminating the problem of wear of the strip supporting skids that occurs in conventional pickling tanks.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a continuous pickling apparatus according to an embodiment of the invention, and FIG. 2 is an enlarged detailed view of the gate portion of FIG. 1. Fig. 3 is a diagram showing the relationship between the clearance (dol) and the fluid reaction force (machi) between the gate and the steel strip in the device of the present invention. Fig. 4 is a longitudinal cross-sectional view of another embodiment of the present invention. 5th
Figure 6 shows a conventional pickling tank, Figure 6 is a partially enlarged detailed view of Figure 5, and Figures 7 and 8 are for explaining the drawbacks of the conventional pickling tank shown in Figure 5. FIG. 7 is a diagram showing the phenomenon in which the steel strip lifts up, and FIG. 8 is a diagram showing the position where the steel strip is exposed. Sub-Agents 1) Meifuku Agent Ryo Hagiwara − Sub-Agent Atsuo Anzai

Claims (1)

[Claims] At least one pair of gates are provided to sandwich the steel strip, each having a nozzle machined into a cushion shape and configured to eject pickling liquid as a jet stream onto the steel strip through the nozzle. A continuous pickling device for strip steel, characterized in that the pickling tank is divided into a plurality of tanks by a partition, or the gate is provided in a pickling tank partitioned into a plurality of tanks by a partition. .