Introduction of semi-continuous pickling of packaging steel strip
by：Hongmei
2021-03-15
Introduction of semi-continuous pickling of packaging steel strip
This method uses a semi-continuous pickling unit, also called a push (or push-pull) pickling unit for pickling. Its technological operation process is: after the strip coil is uncoiled by the decoiler, the strip steel will be straightened by the straightening machine to ensure the smooth passage of the strip through the unit, and the straightened strip will be subjected to the acid solution in the pickling tank. Remove the iron oxide scale on the surface, and then enter the cleaning tank to remove the residual acid brought out by the strip steel from the acid tank. Then the surface is dried by the hot air drying device, and finally the edges are trimmed, the ends are cut, and the ends are combined. Rolled into strip coils on the coiler.
—Generally, the head of the semi-continuous pickling line does not have a guillotine shearing machine. This is because the front 'tongue' of the hot-rolled strip can pass through the line smoothly. However, a driving pull roller is installed in each acid tank and between the acid tank. The gap of the pull roller is adjustable, and the strip end can be more accurately guided to the pull roller. If the semi-continuous pickling unit picks two or more strips at the same time, there will also be a strip guide groove in the acid tank to ensure that several strips can run in parallel in the acid tank.
The semi-continuous pickling unit has no head shears, descaling machines (or stretch-straightening machines), welding machines, loopers (or looper pits) and other equipment, as well as conveying rollers and pulling materials The number of rollers is also much less than that of the continuous pickling unit, and the mechanical equipment of the unit is compressed to a minimum, so its cost is relatively cheap.
Compared with the continuous pickling unit, the simplification of the semi-continuous pickling unit greatly shortens the length of the unit, reduces the floor space, improves the productivity of the unit, and simplifies the operation. At the same time, the variety of strip steel produced Also more. The main disadvantage of the semi-continuous pickling unit is that it cannot be combined. Therefore, this type of unit is not recommended for cold rolling mills and galvanizing plants that use large coils and heavy coils. When the production capacity of the cold rolling mill is not large or medium, a semi-continuous pickling line can be used.
This method uses a semi-continuous pickling unit, also called a push (or push-pull) pickling unit for pickling. Its technological operation process is: after the strip coil is uncoiled by the decoiler, the strip steel will be straightened by the straightening machine to ensure the smooth passage of the strip through the unit, and the straightened strip will be subjected to the acid solution in the pickling tank. Remove the iron oxide scale on the surface, and then enter the cleaning tank to remove the residual acid brought out by the strip steel from the acid tank. Then the surface is dried by the hot air drying device, and finally the edges are trimmed, the ends are cut, and the ends are combined. Rolled into strip coils on the coiler.
—Generally, the head of the semi-continuous pickling line does not have a guillotine shearing machine. This is because the front 'tongue' of the hot-rolled strip can pass through the line smoothly. However, a driving pull roller is installed in each acid tank and between the acid tank. The gap of the pull roller is adjustable, and the strip end can be more accurately guided to the pull roller. If the semi-continuous pickling unit picks two or more strips at the same time, there will also be a strip guide groove in the acid tank to ensure that several strips can run in parallel in the acid tank.
The semi-continuous pickling unit has no head shears, descaling machines (or stretch-straightening machines), welding machines, loopers (or looper pits) and other equipment, as well as conveying rollers and pulling materials The number of rollers is also much less than that of the continuous pickling unit, and the mechanical equipment of the unit is compressed to a minimum, so its cost is relatively cheap.
Compared with the continuous pickling unit, the simplification of the semi-continuous pickling unit greatly shortens the length of the unit, reduces the floor space, improves the productivity of the unit, and simplifies the operation. At the same time, the variety of strip steel produced Also more. The main disadvantage of the semi-continuous pickling unit is that it cannot be combined. Therefore, this type of unit is not recommended for cold rolling mills and galvanizing plants that use large coils and heavy coils. When the production capacity of the cold rolling mill is not large or medium, a semi-continuous pickling line can be used.
