JP3752039B2 - Strip surface drainer for continuous strip processing line - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a strip surface liquid draining device in a continuous pickling line of a steel strip or the like.
[0002]
[Prior art]
Since the steel strip after hot rolling has an oxide film (hereinafter referred to as scale) formed on the surface, pickling with hydrochloric acid or sulfuric acid is performed as necessary. FIG. 9 shows a conventional continuous pickling line. The steel strip wound in a coil shape is unwound by the uncoiler 1, corrected in shape by the leveler 2, the front and rear ends of the steel strip are cut by the crop shear 3, and the rear end of the preceding coil and the succeeding coil are cut by the welder 4. The tip is welded to form a continuous steel strip A. This steel strip A reaches the pickling tank 6 through the entrance side looper 5, and the surface scale of the steel strip A is dissolved and removed, followed by the water washing tank 7, the dryer 8, the exit side looper 9, the side trimmer 10, and the Euler. 11, it is cut into a desired width and length by a dividing shear 12 and wound around a tension reel 13.
[0003]
In the washing tank 7, ringer rolls 14a and 14b for removing acid, water, and the like attached to the surface of the steel strip A are disposed, and respectively opposed to the front and back surfaces of the steel strip A transferred by the ringer rolls 14a and 14b. The spray headers 15a and 15b for injecting the rinse liquid are provided. And the steel strip A is descaled by the pickling solution while being sequentially immersed in the pickling solution of the pickling tank 6. Next, the pickling solution or the like adhering to the surface is washed by the rinsing liquid sprayed from the spray headers 15a and 15b, and the deposits such as the pickling solution and the rinsing liquid are squeezed out by the ringer rolls 14a and 14b. Removed.
[0004]
However, the ringer rolls 14a and 14b are made by lining rubber surface having soft elasticity on the surface of the steel roll, and by pressing and crushing this against a steel strip to squeeze the liquid, the ringer rolls 14a and 14b A gap is generated at both ends of the steel strip A, and the liquid accumulated in the gap remains in a strip shape on the surfaces of both ends of the steel strip A after passing through the ringer rolls 14a and 14b. Further, when the ringer rolls 14a and 14b are used for a long time, the portions 19 corresponding to both ends of the steel strip A are worn as shown in FIG. 10, and a space 18 that does not contact the steel strip is formed, and the steel is not drained. The range in which the liquid remains on the surface of the band A increases.
[0005]
As a countermeasure, Japanese Patent Publication No. 7-65203 proposes an apparatus that blows compressed air and removes a water film. In principle, this device uses an air knife, and by adding rotational movement to this, a plurality of air knives formed in a roll shape are used to sequentially drain liquid, improving liquid draining performance. is there.
[0006]
[Problems to be solved by the invention]
However, liquid cutting with an air knife blows away the liquid adhering to the surface of the steel strip with the kinetic energy of the gas, and the gas source pressure needs to be about 0.4 MPa or more, and the noise caused by the jet sound is high. The required power also has a major drawback. Further, since the necessary source pressure increases as the processing speed (conveying speed) of the steel strip increases, the line speed that can be applied is limited to several hundred m / min from the viewpoint of processing capability.
[0007]
Therefore, the present invention advantageously solves these problems, greatly improves the life of the liquid draining device, improves the liquid draining performance, enables liquid draining with a high-speed plate, and improves productivity. An object of the present invention is to provide a strip surface liquid draining device for a strip continuous processing line which can be improved.
[0008]
[Means for Solving the Problems]
The root cause of the above-mentioned problem is the liquid draining based on the air knife principle. In other words, in the mechanism that shuts off the liquid on the surface of the strip with a curtain-like fluid film, the fluid energy that contributes to the shut-off is the part that changes the direction of movement when the fluid film collides with the strip (part as a line) and is energy efficient. Is bad. Also, in order to avoid contact with the undulating strip during traveling, a fluid ejection nozzle must be arranged at a part away from the strip surface to some extent. It is necessary to give a large amount of energy to erupt, which is also a reason for reducing the energy utilization efficiency.
For this reason, according to the present invention, the strip surface is drained using an action force different from the above, that is, a viscous force.
[0009]
That is, the gist of the present invention is as follows.
(1) By providing a film made of an elastic body with a gap in parallel with the surface of the strip to be drained, a planar gap is formed, and gas flows as a parallel flow through these gaps. And a strip surface liquid draining device for a continuous strip processing line, wherein the film made of the elastic body is levitated by the static pressure of the gas,
(2) As an auxiliary means for forming a planar gap through which a parallel flow of gas flows, a rotating body is disposed on a part of a film made of an elastic body for forming the gap, and the rotating body is used as a liquid draining target. The strip surface liquid draining device for a continuous strip processing line according to (1), wherein the strip surface is made to abut on the strip surface,
(3) The gap for forming the parallel gas flow set by the elastic membrane is made wider on the upstream side of the strip and narrower on the downstream side than the upstream side and downstream side of the strip at the center of the apparatus. A strip surface liquid draining device for a continuous strip processing line according to (1) above,
(4) At least one pair or more of the liquid draining devices are disposed opposite to each other with a strip interposed therebetween, and a coupling machine that connects the liquid draining devices disposed opposite to each other is disposed so that the static pressure of the gas flowing as a parallel flow The strip of the continuous strip processing line according to any one of (1) to (3), wherein a reaction force acting on the liquid draining device main body and / or the strip is held as an internal force of the coupling machine. Surface drainer,
(5) The strip surface liquid draining device of the continuous strip processing line according to (4), wherein the coupling machine is provided with a mechanism for adjusting the distance between the liquid draining devices arranged opposite to each other.
(6) A means for detecting the distance between the strip and the elastic membrane and / or the internal pressure of the space formed by the strip and the elastic membrane, and the strip and the elastic body according to the information detected by the detection means and / or the external command The strip surface liquid draining device for a continuous strip processing line according to (4), characterized in that means for controlling the distance of the membrane is provided.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows an example in which the present invention is applied to a draining device for a water rinsing tank 7 of a steel strip pickling line. The draining device of each tank is a set of front and back (upper and lower), the conventional ringer roll 14 is used as the first stage draining device, and the apparatus 20 of the present invention is used as the second stage (final stage draining). Yes. That is, as shown in FIG. 2, the draining device 20 is disposed without contacting the steel strip A, high-pressure air made by a compressed air generating device (not shown) is sent to the inside of the draining device 20, and the membrane 21 made of an elastic body. In the gap formed by the steel strip A, a parallel jet of air is caused to flow outward. By this air flow, the moisture adhering to the surface of the steel strip is blown off to such an extent that a very thin water film remains (approximately 2 to 3 ml / square cm) and drained. That is, according to the present invention, the surface of the steel strip is drained using the viscous force and momentum of the fluid.
[0011]
Thus, since the liquid draining device of the present invention does not contact the strip, the surface of the liquid draining device is not cut or peeled, and the liquid draining effect is not reduced. The service life can be greatly improved, drainage performance is improved, and the liquid can be drained with a high-speed strip. Further, since a parallel flow channel with a small gap is formed on the surface layer of the strip while avoiding contact with the floating type film, the small gap is several mm. FIG. 7 and FIG. 8 show the relationship between the flow velocity and flow rate in this small gap and the pressure.
[0012]
As shown in FIG. 7, if the gap is 1 mm or more, the pressure ratio is about 2 (generally the outlet pressure is atmospheric pressure, so the original pressure is 0). .2MPa), the gap flow velocity can be set to the speed of sound. That is, a pressure less than half of the pressure of 0.4 to 0.7 MPa used in the air knife type liquid draining may be used. The flow rate at this time is shown in FIG. The required flow rate is greatly reduced by the gap, and if the gap is 1 to 2 mm, the required flow rate per 1 m width can be suppressed to about 1 kg / second.
[0013]
As described above, the liquid draining device of the present invention requires very little flow rate and pressure for liquid draining, and there is no jet sound generated by fluid ejection, and quiet draining with high energy efficiency can be performed.
[0014]
In addition, the essence of the elastic film 21 forming the flow path is to form a required gap without sliding contact with the strip. The contact roll 22 is used to make the required gap, and the contact roll 22 comes into contact with the strip. Thus, there is no problem even if the elastic film 21 and the strip surface have a predetermined mechanical distance. Thus, FIG. 3 shows an embodiment of the present invention in which the contact roll 22 is used to ensure that the elastic film 21 forming the flow path and the strip are not in sliding contact with each other.
[0015]
Further, it is the air that flows out to the upstream side of the line of the liquid draining device 20 that acts on the liquid drain, and the air that flows out to the downstream side only contributes to the floating of the liquid draining device 20; It is advantageous to increase the amount of spillage. For this reason, as shown in FIG. 4, it is preferable to intentionally make the upstream gap larger than the downstream side so that the upstream outflow amount is larger than the downstream outflow amount.
[0016]
FIG. 1 shows an example in which the present invention is applied to a water rinsing tank 7 of a steel strip pickling line. The steel strip A descaled in the pickling tub 6 is removed from adhering substances such as acid and scale attached to the surface of the steel strip with a ringer roll, and enters the rinsing bath 7. The washing tank 7 is divided into two tanks, each having a spray header 15 for injecting rinses on the front and back surfaces of the steel strip A, and a draining device disposed on the downstream side thereof. ), A conventional ringer roll 14b is used as the first stage drainer, and the liquid drainer 20 of the present invention is used as the second stage (final stage drainer).
[0017]
As a planar arrangement of the apparatus 20 of the present invention, as shown in FIG. 5, in order to cope with a change in the width of the strip, a draining apparatus 20- having a central fixed arrangement corresponding to the minimum plate width of the strip produced in the line. 1 and the draining device 20-2, 20-3 located at the end portion constitute the draining device 20, and the draining device 20-2, 20-3 located at the end portion according to the width change of the steel strip, These support mechanisms (not shown) are configured to follow the change in the width direction position.
[0018]
FIG. 6 shows another example of the arrangement of the present invention for achieving the change in width of the strip. The liquid draining devices 20-4 and 20-5 are arranged obliquely, the width position with respect to these strips, and In other words, the setting angle is changed. In the case of this configuration, the discharge of the liquid on the surface to be removed by providing the angle tends to flow in the width direction of the strip, and there is also an effect that the liquid accumulated before the liquid draining device is smoothly discharged. The liquid draining device arranged diagonally is not limited to the two-sided arrangement shown in FIG. 6, but at least one unit (front and one back), and even if arranged obliquely as many units, the effect is The same.
[0019]
As in this example, the washing tank has two stages, the liquid is roughly cut using a conventional ringer roll in the previous stage, and the present invention is used as the final stage of the liquid cutting. In addition, according to the line speed and the required final liquid draining performance, a single-stage or multi-stage configuration may be formed by using only the liquid draining apparatus of the present invention.
Further, as an application destination, in addition to the pickling line shown in the above embodiment, the present invention can be applied with a similar configuration in a line that handles various liquids such as a chromate solution coating line.
[0020]
FIG. 11 is a diagram illustrating an embodiment of the present invention including a coupling machine that couples the liquid draining devices to each other. That is, at least one pair or more of the liquid draining devices are arranged opposite to each other with a strip interposed therebetween, and a connecting machine 23 that connects the liquid draining devices arranged opposite to each other is disposed so that the static pressure of the gas flowing as a parallel flow By holding the reaction force acting on the liquid draining device main body 20 and / or the strip as the internal force of the coupling machine, a large-scale stay for holding the reaction force acting on the liquid draining device is not required, and the liquid The equipment structure of the cutting device can be greatly reduced and simplified.
[0021]
In addition, it is possible to adjust the distance between the liquid draining devices without fixing the connecting part that connects the liquid draining devices to each other, and the distance between the liquid draining devices corresponding to the change in the thickness of the strip to be passed through. By adjusting the above, it becomes possible to efficiently use the energy of the parallel jet flow generated in the gap between the elastic film and the strip. For example, when the strip is initially passed through or when the plate is broken, the liquid draining devices arranged opposite to each other are greatly opened to facilitate the passage of the strip and reduce the work for preparing the passing plate.
[0022]
FIG. 12 further detects the distance between the strip A and the elastic membrane 21 and / or the internal pressure of the space formed by the strip and the elastic membrane, and automatically detects the distance between the strip and the elastic membrane according to the detected information. By controlling the distance between the strip and the elastic membrane and / or the internal pressure to be constant, fluctuations in the distance between the strip and the elastic membrane and / or the internal pressure caused by changes in the thickness of the strip to be passed through, etc. are suppressed and uniform. It is a figure explaining another embodiment of this invention which can achieve the liquid draining of a strip surface. In FIG. 12, 25 is a distance adjusting mechanism between liquid draining devices, 26 is a gap measuring unit and / or pressure measuring unit, and 27 is an automatic control calculating unit, and these operations are performed by these.
[0023]
【The invention's effect】
As described above, since the liquid draining roll of the present invention does not come into contact with the strip, the liquid draining roll does not cause cut scratches or peeling on the surface of the liquid draining roll, and the liquid draining effect does not deteriorate. The life of the steel strip can be greatly improved, the liquid draining performance is also improved, and the high plate feed speed (10-15 m / sec) of the steel strip is still lower than the liquid draining air velocity (340 m / sec). Therefore, the ability of draining is still sufficient, and it is possible to drain the liquid with a high-speed plate, and the productivity can be improved.
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment of the present invention.
FIG. 2 is a perspective view showing details of an embodiment of the present invention.
FIG. 3 is a perspective view showing another embodiment of the present invention.
FIG. 4 is a perspective view showing a preferred example of gap setting according to the present invention.
FIG. 5 is a diagram showing an example of a planar arrangement of the device of the present invention.
FIG. 6 is a diagram showing another example of the planar arrangement of the device of the present invention.
FIG. 7 is a diagram showing a relationship between a gap and a liquid draining flow velocity / pressure.
FIG. 8 is a diagram showing a relationship between a gap and a liquid draining flow rate / pressure.
FIG. 9 is an explanatory view of a conventional continuous pickling line.
FIG. 10 is an explanatory diagram of a liquid draining state by a conventional ringer roll.
FIG. 11 is a diagram for explaining an embodiment of the present invention including a coupling machine that couples the liquid draining devices arranged opposite to each other.
FIG. 12 is a diagram for explaining an embodiment of the present invention for automatically controlling the distance between the liquid draining devices arranged opposite to each other.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Uncoiler 2 Leveler 3 Crop shear 4 Welder 5 Entering side looper 6 Pickling tank 7 Flushing tank 8 Dryer 9 Outlet looper 10 Side trimmer 11 Euler 12 Dividing shear 13 Tension reel 14 Ringer roll 15 Spray header 20 Liquid draining device main body 21 Elastic film 22 Contact rotating body for setting gap (contact roll)
23 Linking machine (connecting part)
24 Gap sensor and / or pressure sensor 25 Distance adjustment mechanism 26 between liquid draining devices Gap measurement unit and / or pressure measurement unit 27 Automatic control calculation unit

Claims (6)

By arranging a film made of an elastic material (elastic film) with a gap in parallel with the surface of the strip to be drained, a planar gap is formed, and a gas flows as a parallel flow in these gaps. The strip surface liquid draining device of the continuous strip processing line is characterized in that the film made of the elastic body is floated by the static pressure of the gas. As an auxiliary means for forming a planar gap for flowing a parallel flow of gas, a rotating body is disposed on a part of a film made of an elastic body for forming a gap, and the rotating body is a strip surface to be subjected to liquid drainage. The strip surface liquid draining device of the continuous strip processing line according to claim 1, wherein the strip surface liquid draining device is in contact with the strip surface. Compared to the upstream and downstream sides of the strip at the center of the device, the gap for forming the parallel gas flow set by the elastic membrane is wide on the upstream side of the strip and narrow on the downstream side. The strip surface liquid draining device for a continuous strip processing line according to claim 1. At least a pair or more of the liquid draining devices are disposed opposite to each other with a strip interposed therebetween, and a coupling machine that connects the liquid draining devices that are disposed to face each other is disposed, and the liquid draining device is operated by static pressure of a gas flowing as a parallel flow. The strip surface liquid draining device for a continuous strip processing line according to any one of claims 1 to 3, wherein a reaction force acting on the main body and / or the strip is held as an internal force of the coupling machine. . 5. The strip surface liquid draining device for a continuous strip processing line according to claim 4, wherein a mechanism for adjusting a distance between the liquid draining devices arranged opposite to each other is provided in the connecting machine. Means for detecting the distance between the strip and the elastic membrane and / or the internal pressure of the space formed by the strip and the elastic membrane, and the distance between the strip and the elastic membrane according to the information and / or external command detected by the detection means The strip surface liquid draining device for a continuous strip processing line according to claim 4, further comprising means for controlling

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