JPH0433869B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a high-speed pickling device for pickling scales and the like generated on the surface of a strip during a hot rolling process at a high speed.

[Conventional technology]

The scale on the surface of the strip after hot rolling is usually removed by pickling with hydrochloric acid, sulfuric acid, etc. at a concentration of 10 to 15% at about 80°C. The conventional pickling method, as shown in Japanese Patent Application Laid-open No. 76929/1983, involves running the strip while immersing it in several pickling tanks that store acid solution. .

[Problem to be solved by the invention]

However, it usually takes about 30 seconds to completely remove scale, etc. from the surface of the strip by pickling. The running speed of the strip is approximately 300
m/min, the length of the pickling tank required is as much as 150 m. In the method described in JP-A-53-76929, the pickling time is shortened by heating the strip with a burner before it enters the pickling tank. However, heating the strip only reduces the pickling time by about 10%, and the length of the pickling tank is still as long as 135 m. Therefore, there was a problem in that an extremely large equipment space was required to install the pickling tank.

In addition, in recent years, from the viewpoint of energy saving and resource saving, there has been an increasing demand for continuous equipment that combines the pickling equipment with the cold rolling equipment for the next process. However, in the past, as mentioned above, the pickling tank was extremely long, requiring an enormous amount of equipment space, making it difficult to make the equipment continuous.

The present invention was made in consideration of the above circumstances, and
It is an object of the present invention to provide a high-speed pickling device that can shorten pickling time, shorten a pickling tank, and reduce equipment space, and can be easily connected to cold rolling equipment.

[Means to solve the problem]

In order to achieve the above object, the high-speed pickling device of the present invention uses rollers that run the strips by turning them in the vertical direction to form a uniform narrow interval between adjacent strips whose running directions are opposite to each other. and an acid solution supplying means for supplying an acid solution to the narrow interval, and the strip is pickled with the turbulent acid solution layer within the narrow interval.

[Effect]

According to the above configuration, while supplying the acid solution from the acid solution supplying means within the narrow interval between adjacent strips,
When the strips are run, turbulence occurs in the acid liquid layer within a narrow interval because the directions of movement of adjacent strips are opposite to each other. Moreover, since the narrow gaps are uniformly formed, turbulence occurs uniformly over a wide range of the strip surface. For this reason, the strip surface is constantly brought into contact with a new acid solution, improving the pickling efficiency and shortening the pickling time. By shortening the pickling time, the length of the pickling tank can be shortened, and the space for installing the pickling tank can be reduced.

In addition, since the strip is configured to turn back and run vertically, the length of the pickling tank can be shortened, making it possible to further reduce the space required to install the pickling tank. becomes.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic configuration of a high-speed pickling apparatus according to the present invention. This high-speed pickling device pickles the strip after it has been heated. As shown in the figure,
The strip 90 is guided by guide rollers 91 to a pickling tank 92. Next, rollers 93, 94, 9
5, 96, 97, and 98, the strip 90 is turned back and runs. Folded strip 9
0, adjacent parts run in opposite directions. Adjacent portions of the strip 90 are also closely spaced, and the narrow spacing is uniform along the direction of travel of the strip 90. A header 100 is provided to supply the acid solution to this narrow space. Since adjacent portions of the strip 90 run in opposite directions, the acid solution supplied from the header 100 within a narrow interval will cause severe turbulence, descend under the influence of gravity, and be stored in the pickling tank 92. It will be done. This acid solution is pumped through a circulation pump (not shown).
is circulated again from the header 100. In addition,
The pickled strip 111 is sent to the next step via guide rollers 99.

In this embodiment, since the strip itself constitutes a band-like body having opposing surfaces, there is no need to newly provide means for causing turbulence in the acid solution, and the structure is extremely simple.

FIG. 2 shows an example in which the high-speed pickling device shown in FIG. 1 is installed on an actual production line. In the figure, strip 1
11 is applied with tension between an inlet tension roller 101 and an outlet tension roller 105. A scale breaker roller 102 for cracking the scale of the strip 111 is disposed between the tension rollers 101 and 105. By the scale breaker roller 102, the strip 11
No. 1 is bent and stretched by about 3.5 to 10% to crack the scale and make it easier to remove the scale. By cracking the scale in this way, it is possible to reduce the pickling time by about 50%. Next, the strip 111 is leveled flat by a straightener 103 and descaled by a brush roller 104. However, it is difficult to completely remove the scale using only the brush roller 104, and finally, the scale is completely removed using a pickling device.

The strip 111 is the exit tension roller 10
5, it is led to a heating device 106. A heating pad 112 is vertically installed in the heating device 106. By this heating device 106, the strip 1
11 is heated to around 80°C.

Strip 111 is then sent to high speed pickling equipment 107. The high-speed pickling device 107 shown in FIG. 1 is used. High speed pickling device 107
After pickling, the strip 111 is sent to a cleaning device 108, where the acid solution is removed by a cleaning solution from a cleaning nozzle 113. Next, tension is applied by a tension roller 109, and after cold rolling is carried out in a continuously connected cold rolling device 110, the finished product is carried out.

According to this embodiment, since a scale breaker and a brush are used, the pickling time is halved, and the high-speed pickling device further reduces the pickling time to 1/3.
The pickling time, which conventionally required about 30 seconds, has been reduced to 3 to 5 seconds. In addition, the thickness of the strip in this case is
2.5~5mm, board width 700~1650mm, running speed 50~300
m/min.

〔Effect of the invention〕

As explained above, according to the present invention, the strip is pickled by the turbulent flow of acid solution uniformly generated over a wide range of the strip surface, so the pickling time is shortened and the pickling tank is made smaller. be able to. Furthermore, since the strips are arranged vertically, this also allows the pickling tank to be made smaller. By downsizing the pickling tank, the equipment space for the pickling tank can be reduced, and cold rolling equipment can be easily connected in series.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of the high-speed pickling device of the present invention;
FIG. 2 is a diagram showing an example in which the high-speed pickling apparatus shown in FIG. 1 is installed in a production line. 90,111...Strip, 91,99...
Guide roller, 93, 94, 95, 96, 97,
98...Roller, 100...Hetsuda, 101...
Inlet tension roller, 102... Scale breaker roller, 103... Straightening machine, 104... Brush roller, 105... Outlet tension roller, 1
06... Heating device, 107... High speed pickling device, 1
08...Cleaning device, 109...Tension roller, 110...Cold rolling device, 112...Heating pad, 113...Cleaning nozzle.

Claims (1)

[Claims] 1 A roller that runs the strip by folding it in the vertical direction to form a uniform narrow interval between adjacent strips whose running directions are opposite to each other, and an acid solution supply means that supplies acid solution to the narrow interval. A high-speed pickling device, characterized in that the strip is pickled by a turbulent layer of acid liquid within the narrow interval.