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Automated process of packaging steel strip finishing rolling zone
by：Hongmei
2021-03-30
Automated process of packaging steel strip finishing rolling zone
The roller table from the exit of the roughing mill to the entrance of the finishing mill is called the delayed roller, and it is also called the E roller according to the number of the roller. On the left side of the forward direction of the E roller table, there is a waste pusher, and on the right side is a fixed platform for processing waste strips.
The speed of the roller table is controlled by a computer, which not only shortens the running time of the intermediate strip, but also avoids the collision between the front and the back. When the strip comes out of the last roughing mill, the speed of the roller table is synchronized with that of the Gen stand. When the strip tail leaves the R4 frame, the computer checks the collision conditions. If there is no collision, it controls the 2 rollers to run at a high speed. Otherwise, it controls the 2 rollers to run at a low speed until there is no collision. When this piece of strip reaches the hot metal detector HMD4 before the cutting head flying shear, if the leading strip is still in the F1ON condition of the first finishing mill, that is, the leading strip is still rolling in F1, the computer must determine whether it will If it collides with the preceding strip, if F1OFF means that there is no rolling stock, it is necessary to check whether the roll gap and speed of the rolling mill reach the set value. If there is a possibility of collision, or the check fails, a swing command is issued to make 2 The roller is reversely delayed for 10s and then forwards forward, so that it swings back and forth (repeat the check every time the HMD54 is turned on), until it is qualified, and the computer issues an instruction to release the swing. When the strip advances to the hot metal detector 55, the speed measuring roller descends to measure the actual running speed of the strip at this time, so that when the strip advances to the hot metal detector 61, the speed of the strip is completely reduced to that of the flying shear The cutting speed is the same. When the strip head reaches the hot metal detector 61, the flying shear is activated to automatically cut off the irregular or low-temperature head of the strip. Then the speed of the strip should be further reduced to be compatible with the biting speed of the first stand F1 of the finishing mill, that is, reduction compensation is considered. The speed of the strip during tail cutting is detected by the upper roll of the second pair of pinch rolls in the descaling box before finishing rolling, and then the speed of the flying cut tail is determined according to this speed, and the hot metal detection is still used when the tail is cut 61 to start the flying shear. In order to prevent the cut head and tail from hitting the strip blank, the flying shear speed when cutting the head should be slightly higher than the speed of the strip blank, and the flying shear speed should be slightly lower than the speed of the strip blank when cutting the tail.
The roller table from the exit of the roughing mill to the entrance of the finishing mill is called the delayed roller, and it is also called the E roller according to the number of the roller. On the left side of the forward direction of the E roller table, there is a waste pusher, and on the right side is a fixed platform for processing waste strips.
The speed of the roller table is controlled by a computer, which not only shortens the running time of the intermediate strip, but also avoids the collision between the front and the back. When the strip comes out of the last roughing mill, the speed of the roller table is synchronized with that of the Gen stand. When the strip tail leaves the R4 frame, the computer checks the collision conditions. If there is no collision, it controls the 2 rollers to run at a high speed. Otherwise, it controls the 2 rollers to run at a low speed until there is no collision. When this piece of strip reaches the hot metal detector HMD4 before the cutting head flying shear, if the leading strip is still in the F1ON condition of the first finishing mill, that is, the leading strip is still rolling in F1, the computer must determine whether it will If it collides with the preceding strip, if F1OFF means that there is no rolling stock, it is necessary to check whether the roll gap and speed of the rolling mill reach the set value. If there is a possibility of collision, or the check fails, a swing command is issued to make 2 The roller is reversely delayed for 10s and then forwards forward, so that it swings back and forth (repeat the check every time the HMD54 is turned on), until it is qualified, and the computer issues an instruction to release the swing. When the strip advances to the hot metal detector 55, the speed measuring roller descends to measure the actual running speed of the strip at this time, so that when the strip advances to the hot metal detector 61, the speed of the strip is completely reduced to that of the flying shear The cutting speed is the same. When the strip head reaches the hot metal detector 61, the flying shear is activated to automatically cut off the irregular or low-temperature head of the strip. Then the speed of the strip should be further reduced to be compatible with the biting speed of the first stand F1 of the finishing mill, that is, reduction compensation is considered. The speed of the strip during tail cutting is detected by the upper roll of the second pair of pinch rolls in the descaling box before finishing rolling, and then the speed of the flying cut tail is determined according to this speed, and the hot metal detection is still used when the tail is cut 61 to start the flying shear. In order to prevent the cut head and tail from hitting the strip blank, the flying shear speed when cutting the head should be slightly higher than the speed of the strip blank, and the flying shear speed should be slightly lower than the speed of the strip blank when cutting the tail.
