JPH07268672A - Continuous pickling device - Google Patents

Abstract

PURPOSE:To improve the pickling efficiency and to eliminate the need of further extending pickling tanks without using any dam roll by supporting a brush pad to be vertically movable just above a skid tile formed in the upper part of each of partition dams over which a strip is moved to subject it to pickling. CONSTITUTION:In this device, the steel strip 5 spread in a horizontal plane is fed in the longitudinal direction and the plural pickling tanks are arranged in series along this feed direction through interposing one of the partition dams 2 between every adjacent two of them and the strip 5 is moved over the skid tile formed in the upper part of each of the partition dams 2 while immersing the strip 5 in an acid solution of each of the pickling tanks to subject it to pickling. Also, the brush pad 11 for pressing the strip 5 at the position just above the skid tile of each of the partition dams 2, the supporting means 12 for the brush pad 11 and the powered elevating/ lowering means 13 for moving the supporting means 12 so as to vertically move the brush pad 11 are installed in the device. When the strip 5 is fed while pressing its upper surface with the brush pad 11, cracks are generated in the oxide film of the strip 5 to improve the properties with respect to descaling of the strip 5 and therefore, smuts, etc., can be removed. Further, the parts of the strip 5 having adverse shapes can be allowed to pass by elevating the brush pad 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous pickling apparatus, and in particular, a strip-shaped thin steel plate is continuously passed while being immersed in a plurality of pickling tanks arranged in a line direction to oxidize the surface of the strip steel. The present invention relates to a continuous pickling apparatus that continuously removes a film with an acid solution.

[0002]

2. Description of the Related Art In FIGS. 4 and 5 showing a conventional general pickling tank, 1 is a pickling tank main body, 2 is a weir, 3 is an upper cover,
4 is an acid solution, 5 is a steel strip, 6 is a ringer roll for finally removing the acid solution adhering to the surface of the steel strip from the pickling tank, and 7 is a washing bath for washing the steel strip with water. is there. Reference numeral 8 is an acid-resistant porcelain brick, and 9 is a skid tile for supporting a steel strip, which is installed on the upper part of the partition 2 between the pickling tanks.

The steel strip 5 enters the first bath of the pickling bath from the inlet side in the direction of the arrow, and is immersed in the acid solution 4 stored in the bath while supporting the steel strip installed above the partition weir 2. Go over the skid tile 9 and enter the second tank. Similarly, several pickling tanks are passed through, and while the steel strip 5 is passed through the acid solution, the oxide film on the surface of the steel strip 5 is sequentially removed.
After passing through the spray water inside, it is washed with water and the pickling process is completed.

[0004]

As a recent trend, a pickling line and a rolling line have been made continuous for the purpose of improving productivity, and the following problems have been caused with the high-speed passage of the pickling line. Has occurred. Extend the pickling tank to secure descaling time. As shown by the dotted line in FIG. 5, the energy due to the movement of the steel strip 5 at the time of high-speed stripping causes the movement of the acid solution, which lowers the liquid level on the front surface of the acid solution tank, so that the upper surface of the steel strip 5 is not immersed Reduces pickling ability. A method is used in which dam rolls D are installed at intervals on the partition weir 2 shown in FIG. 5 to prevent liquid transfer between the tanks and prevent lowering of the liquid level in the front tank. Fluctuations in the liquid level in each tank cannot be prevented, and the liquid level in the split tank is lowered on the front side and raised on the rear side, and the immersion length is shortened. The dam roll D is easily damaged by the steel strip having a bad shape, and the roll must be replaced frequently. The dam roll blocks the acid-like flow of the acid solution.

An object of the present invention is to solve the above problems and to provide a continuous pickling apparatus which does not use a dam roll, has a high pickling efficiency, and can prevent the extension of the pickling tank.

[0006]

In order to solve the above problems, the structure of the present invention is as follows. That is, in the first configuration, the strips are fed in the lengthwise direction in a state of being spread in a horizontal plane, and a plurality of pickling tanks are arranged in series along the feeding direction of the strips through partition weirs. In the continuous pickling apparatus in which the strip plate is pickled by passing over a skid tile provided on the upper part of the partition weir while being immersed in the acid solution of each pickling tank, directly above the skid tile. A brush pad for pressing the strip plate, a support means for the brush pad, and a power raising / lowering means for moving the brush pad to move the support means.

In the second construction, in addition to the first construction, the brush pad is formed by implanting acid-resistant synthetic resin fibers containing abrasive grains on an acid-resistant base plate, and has a V or U shape in plan view. A bypass flow path is provided near the side wall of the pickling tank to be convex toward the plate feeding direction and to guide the flow in the direction opposite to the strip traveling direction generated by being dammed by the brush pad to the front part of the pickling tank. That is.

The third configuration is, in addition to the first or second configuration,
The pad support means is an arm having the brush pad attached to the tip on the downstream side in the strip feeding direction, and a base end of the arm is fixed at a right angle so as to be rotatable in parallel to the width direction of the pickling tank. The power raising / lowering means includes a lever fixed perpendicularly to the end of the swing shaft and a horizontal axis parallel to the swing shaft, the lever being fixed to one end of the lever. And a fluid piston cylinder mechanism attached to the side wall of the pickling tank.

[0009]

Operation: With the piston rod of the piston cylinder biased, the swing shaft is biased around the axis to press the pad against the upper surface of the strip plate, and the strip plate is fed in this state. The oxide film of the strip is cracked, the acid solution permeates into the oxide layer better, the descaling property is improved, and the strip running speed can be improved. In addition, by operating the piston cylinder in reverse to raise the brush pad and separate it from the strip plate, it is possible to pass the portion before and after the welding point where the strip plate has a bad shape without damaging the brush pad.

The acid solution entrained by the moving energy of the strip is dammed by a brush pad installed on the upper part of the partition weir, and flows from the center of the strip width direction to both edge sides in the direction opposite to the traveling direction of the strip. . This increases the stirring action of the acid solution. Then, the acid solution flows through the acid solution circulation bypass to the front surface of the tank, the liquid level balance between the front surface and the rear surface of each divided tank can be maintained, and the immersion of the strip in the acid solution is increased.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below based on an embodiment shown in the drawings.

FIG. 1 is a partial side sectional view of a shallow bath type continuous pickling apparatus, and FIG. 2 is a sectional view taken along line II--II of FIG. The pickling apparatus of the present embodiment is constructed by connecting four pickling tanks 1a in the line direction of the strip plate 5, but FIG. 1 shows only the first boundary portion between the first tank and the second tank. There is.

The strips 5 are fed in the lengthwise direction in a state of being spread in a horizontal plane, and a plurality of pickling tanks 1a are arranged in series along the feeding direction of the strips through partitioning weirs 2. While being immersed in the pickling in each of the pickling tanks, the strip is passed over the skid tile 9 provided on the upper part of the partition weir and pickled.

Now, the brush pad 11 for pressing the strip plate 5 directly above the skid tile 9, the supporting means 12 for the brush pad, and the supporting means 12 for moving the brush pad 11 up and down. Power elevating means 13 is provided.

That is, as shown in FIG. 11, the brush pad 11 comprises a brush made of acid-resistant nylon fiber 11b containing abrasive grains, which is planted on an acid-resistant base plate 11a made of ceramic or stainless steel. Innumerable abrasive grains 11c are exposed on the surface of the fiber 11b. Further, the base plate 11a has a V or U shape in a plan view (FIG. 3) and is convex toward the strip plate feeding direction. In the pad supporting means 12, an arm 12a having a brush pad 11 attached at its tip is fixed at a right angle to a swing shaft 12b, and both ends of the swing shaft 12b are brackets 12c.
It is rotatably supported via.

In the power raising / lowering means 13, the swing shaft 12b
A lever 13a is fixed at both ends of the rod 13a at right angles thereto, a piston rod of a piston cylinder mechanism 13b is fixed at one end thereof (downstream side in the strip feeding direction), and a cylinder side has a horizontal axis parallel to the swing shaft 12b. It is attached to the side wall of the pickling tank so as to be rotatable around 13d. Also, the lever 13a
A balance weight 13c is fixed to the other end (upstream side in the band plate feed direction) of the.

In FIG. 3, a bypass passage 20 formed by the partition plate 14 is provided near the side wall of each tank.

The operation state will be described above. With the piston rod of the piston cylinder 13b biased downward, the swing shaft 12b is biased clockwise in FIG.
Is pressed against the upper surface of the strip plate, and the strip plate 5 is fed in this state.

By rubbing the brush pad 11 on the surface of the steel strip 5, the oxide film of the steel strip is cracked,
The permeation of the acid solution into the oxide layer is improved, the descaling property is improved, and the plate passing speed can be improved.

By rubbing the brush pad 11 on the surface of the strip 5, smut and dirt on the surface of the steel strip 5 can be removed and the surface quality can be improved. Further, by operating the piston cylinder 13b in the reverse direction to raise the brush pad 11 and separate it from the strip plate, the portion before and after the welding point where the strip plate has a bad shape can be passed without damaging the brush pad 11.

The acid solution 4 entrained by the moving energy of the strip 5 is dammed by the V-shaped brush pad 11 installed on the upper part of the partition weir, as shown by the arrow in FIG. It flows in the opposite direction to the traveling direction of the strip 5 toward both edges. This increases the stirring action of the acid solution.

Then, the acid solution flows through the acid solution circulation bypass 20 to the front surface of the tank, so that the liquid level balance between the front surface and the rear surface of each divided tank can be maintained, and the immersion of the strip in the acid solution is increased. .

Further, in order to ensure a cascade-like flow of the acid solution, which is a characteristic of the shallow bath type pickling device, which is opposed to the progress of the steel solution 5 of the acid solution, the movement of the steel strip 5 is performed by the acid solution. When the plate is passed at a low speed that does not affect the lowering of the liquid level, the pad 11 can be raised and separated from the strip plate to be passed.

The present invention is not limited to the examples and embodiments described above, but includes various modifications without departing from the spirit and scope of the claims.

[0025]

According to the first structure of the present invention, the degree of penetration of acid into the oxide film is increased, the length of immersion in the acid solution is extended, and the action of stirring the acid solution is increased. High-speed pickling and improvement of pickling finish on the strip surface are possible.

With the second structure, in addition to the effect of the first structure, the stirring action of the acid solution is increased, and the balance of the liquid level in each tank can be maintained.

With the third structure, in addition to the effects of the first structure or the second structure, it is possible to easily prevent the pad from exerting excessive pressing force on the steel strip.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a schematic plan view of a pickling tank.

FIG. 4 is an enlarged side view of the brush pad.

FIG. 5 is a sectional view of a conventional pickling tank.

FIG. 6 is a partially enlarged cross-sectional view of a conventional pickling tank.

[Explanation of symbols]

1 ... Pickling tank main body 2 ... Partition weir 3 ... Top cover
4 ... Acid solution 5 ... Steel strip 6 ... Ringer roll 7 ... Rinsing tank 8 ... Acid-resistant porcelain brick 9 ... Skid tile 10 ... Steel strip support roll 11 ... Brush pad 12 ... Pad support means 12a ... Arm 12b ... Oscillation shaft 12c ... Bracket 13 ... Power raising / lowering means 13a ... Lever 13b ... Piston cylinder 13c ...
Balance weight 13d ... Pin 20 ... Bypass flow path

Claims (3)

[Claims] 1. A strip is fed in a lengthwise direction in a state of being spread in a horizontal plane, and a plurality of pickling tanks are arranged in series along a feed direction of the strip through a partition weir, The strip is a continuous pickling apparatus in which the pickling process is performed by overcoming the skid tile provided on the upper part of the partition weir while being immersed in the acid solution of each pickling tank, and the strip is directly above the skid tile. A continuous pickling apparatus comprising: a brush pad for pressing a plate; a supporting means for the brush pad; and a power elevating means for moving the supporting means so as to elevate the brush pad. 2. The brush pad is made of acid-resistant synthetic resin fibers containing abrasive grains and is planted on an acid-resistant base plate, and has a V-shape in plan view.
Alternatively, a bypass flow path that has a U shape and is convex toward the strip feeding direction side and guides the flow in the direction opposite to the strip traveling direction generated by being dammed by the brush pad to the front part of the pickling tank is provided. The continuous pickling apparatus according to claim 1, wherein the continuous pickling apparatus is provided near a side wall of the washing tank. 3. The pad support means includes an arm having the brush pad attached to a tip on a downstream side in a strip plate feeding direction,
A swing shaft that is rotatably supported in parallel with the width direction of the pickling tank by fixing the base end of the arm at a right angle; and the power elevating means is orthogonal to the end of the swing shaft. And a fixed lever, and a fluid piston cylinder mechanism connected to one end of the lever and rotatable around a horizontal axis parallel to the swing axis and attached to a side wall of the pickling tank. The continuous pickling apparatus according to claim 1.