The control method to prevent the core pulling of the inner ring of the steel coil when the coiler unloads the coil

Abstract

The invention provides a control method for preventing a steel coil inner ring from core pulling during coil stripping of a coiling machine. The control method for preventing the steel coil inner ring from core pulling during coil stripping of a coiling machine comprises the steps that the position of a tong opening is detected after coiling is finished; an ideal shearpoint of strip steel is calculated; a strip tail is positioned; and automatic coil stripping is conducted. The phenomena of jamming of a strip head, scratching of the steel coil inner ring and core pulling during coil stripping can be completely eliminated by adopting the control method for preventing core pulling of the steel coil inner ring during coil stripping of the coiling machine.

Description

Technical field: [0001] The invention relates to a control method for preventing core-pulling of the inner ring of a steel coil when a coiler unloads coils, and belongs to the technical field of automatic control of metallurgical cold rolling. Background technique: [0002] see figure 1 , 2 , in the modern cold-rolled pickling production line, due to the thicker strip steel specifications, the reel 5 of the coiler 4 is often provided with a jaw mechanism 6 . In the production process, before the coiler 4 coils the steel strip 1, in order to ensure that the tape head 2 can be smoothly introduced into the jaw 61, the position of the jaw 61 needs to be positioned between the reel 5 and the steering roller through the jaw positioning photoelectric switch 7. The anastomosis positions of the three common tangent lines, that is, the jaws 61 are in the waiting position for insertion. After the tape head 2 is introduced into the jaws 61, the hydraulic cylinder 63 promotes the depr...

AI Technical Summary

Problems solved by technology

However, there are following problems in the actual coil unloading process: (1) after the steel coil is held up by the trolley saddle 12, due to the influence of the gravity of the steel coil, the inner and outer circumferences of the steel coil will be slightly eccentric to present an ellipse, As a result, the gap between the upper and lower ends of the inner ring of the steel coil and the reel becomes smaller, and the gap between the left and right ends of the coil and the reel becomes larger

(2) Due to the local convexity of the outer surface corresponding to the jaw position, the radius of curvature suddenly decreases. When the steel plate is thicker, the expansion and contraction of the reel is not enough to meet the core-pulling gap requirements

[0005] To sum up, due to the main control of the stop position of the tail of the steel coil in normal production, the position of the jaws of the reel is in an uncontrollable state, so it cannot completely eliminate the jamming of the head when unloading the coil and the scratch of the inner ring of the steel coil , core pulling phenomenon

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