Method for positioning jaw opening of coiler mandrel

Abstract

The invention relates to a method for positioning jaw opening of coiler mandrel, which is characterized in that: 1) when the length of the steel coil reaches requirement, after the detection device sends signal, the mandrel motor is stopped; 2) the cycle N of rotation of the jaw opening after cutting is calculated, wherein N=1 / 3+(L1+L2) / PiD, the position of the jaw opening when the plate coiling is terminated is calculated by combining the cycle N, and the jaw opening must be located on the horizontal line at center of the mandrel; 3) the mandrel motor is started, to start to establish tension and perform cutting operation; 4) the tape tail is stopped at the position of the cradle roll under the guide of a tape tail grating detection device, and the mandrel motor is stopped. Compared with the prior art, by the sectioning operation of a sectioning machine, and controlling the position of the jaw opening at cutting, the probability of the scratch of inner circle of the plate steel coil longer than 8 mm is greatly reduced, and the product yield is improved by 0.4-0.5% or above.

Description

technical field [0001] The invention relates to the field of coilers of a hot-rolled strip steel coil leveling unit, in particular to a coiler jaw positioning method for avoiding scratches on the inner ring of steel coils. Background technique [0002] At present, when the sub-coil coiler is coiling steel coils with a plate thickness of 8mm and above, the inner coil contacts the coil fan-shaped plate during the coil unloading process after coiling, causing scratches. The working process of the reel is that when the head of the strip is inserted into the position of the jaw, the reel expands, the clamp rises to clamp the strip, and then starts to rotate forward to wind the strip on the reel. When the length reaches the requirement, the detection device sends out a signal, the reel motor speed decreases, and then the tension is established and the cutting operation is carried out. Finally, the tape tail is guided by the grating detection device to stop at the position of the e...

AI Technical Summary

Problems solved by technology

[0002] At present, when the sub-coil coiler is coiling steel coils with a plate thickness of 8mm and above, the inner coil is in contact with the fan-shaped plate of the reel during the coil unloading process after coiling, resulting in scratches.

When the steel plate is thick, the amount of expansion and contraction of the reel is not enough to meet the gap requirement, causing the fan-shaped plate near the jaws to rub against the inner surface of the steel coil, which will cause scratches on the inner ring of the steel coil

[0004] Since the tail of the steel coil is mainly controlled during production, the position of the jaws is in an uncontrollable state, so the scratches on the inner ring of the steel coil caused by the eccentricity of the support roll cannot be completely eliminated

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