12. How to judge the tension between each rolling mill stand in production?
For the tension between the stands of the rolling mill, the adjuster generally hits the tensional rolled piece with a pipe, and judges the magnitude of the tension based on his experience, and can also observe the load (current magnitude) of each mill stand. If the load of one motor in the adjacent frame is particularly small, and the load of the other motor is too large (the current is too large), it means that there is severe steel drawing between the frames, which is easy to pull off the rolled piece and cause piling-up of steel.
13. How to deal with common faults in loopers?
The most common failure is that the looper cannot detect the rolled piece, the looper cannot afford the loop, the looper raises the high loop, and the looper shakes greatly.
(1) The looper cannot detect the rolled part. The usual reason is that the looper scanner lens is dirty or the looper scanner is not aligned with the steel. The solution is to wipe the looper lens first, and then test looper scanner (calibration loop) with the test rod.
The test method is to put the test rod in the looper table. The brightness of the test rod is similar to that of the red steel. Move the test rod slowly from the bottom of the looper table. If the signal does not arrive or is unstable, move the looper scanner to the left and right until it is aligned with the looper scanner head, unless the steel hits the scanner and is fixed after alignment. The possible reason is that there is too much cooling water in the looper table, and the cooling water needs to be reduced appropriately.
(2) The looper can't afford. There may be two situations: the air valve is leaking; the air valve pressure is not enough; The valve is not energized. The first two reasons are dealt with by overhaul, and the latter is checked by electrical to check whether the cable and wiring are firm.
(3) The looper raises its height. If the operator sets the parameters improperly, it can be solved by the operator modifying the parameters.
(4) The looper shakes greatly. It may be that the water mist is too large, which affects the looper signal. A fan can be placed next to the looper to blow.
14. Reasons and countermeasures for looping tail
① Improper setting of the set-up time will cause the set-up time to be too late, which will directly lead to slipping of the loop.
②Severe out-of-tolerance of the red billet size of the front frame of the looper and the excessive opening or excessive wear of the corresponding rolling guide will cause the looper at the tail of the rolled piece to flick intermittently in the retracted state.
③ The electrical control system is abnormal, and the joint adjustment between the roughing and intermediate rolling units is interrupted. The intermediate rolling speed continues to rise with the loop rising, but the speed of all 6 rolling mills in roughing rolling does not increase with the joint adjustment but always remains the same. The situation caused 4# or 6# tails to be flicked, and in severe cases caused the tail to be held back.
④ The action of the roller wind valve of the rising looper is delayed, resulting in the looper falling time being too late, which will directly cause the looper to flick.
⑤ The main method of controlling the looper tail dumping is as follows: reduce the height of the tail of the rolled piece and set the closing time of the take-up loop roller accurately.
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