An emergency control method for virtual diameter of a rewinder when a diameter sensor fails

CN122444012APending Publication Date: 2026-07-24SHANXI QIANG WEI PAPER CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANXI QIANG WEI PAPER CO LTD
Filing Date
2026-06-16
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing technologies cannot achieve seamless emergency control when the diameter sensor of the rewinding machine fails, leading to production interruption or abnormal operation. Furthermore, the error is large when relying on thickness parameters, and the system is complex and has high maintenance costs.

Method used

The virtual diameter is calculated by pre-calibrating the proportional constant k and the real-time length. By utilizing the existing length calculation function and encoder of the rewinding machine, the system switches to the virtual diameter calculation mode when the sensor fails, thus achieving seamless emergency control.

Benefits of technology

It enables seamless switching in case of sensor failure, avoids production interruption, improves calculation accuracy and stability, reduces equipment and maintenance costs, and is suitable for production scenarios involving multiple paper types.

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Abstract

The application discloses an emergency control method for virtual diameter of a rewinder when a diameter sensor fails, and belongs to the technical field of rewinder control. The method comprises a calibration stage and a running stage. When the sensor is normal, a proportional constant k which comprehensively reflects the thickness of paper and the tightness of winding is calibrated through a real-time measurement of diameter and length and is stored in a memory, and the calibration formula is: k= (L / D) / (L / D0). During running, the state of the sensor is monitored in real time. Once the sensor fails, the virtual diameter calculation mode is switched to seamlessly, and the virtual diameter is continuously calculated by using the formula, which is used as a feedback signal to replace the fault signal input into the drive controller, so that the continuous running of the torque difference, the pressure roller pressure and the automatic water spraying humidification system is maintained. The k value reflects the thickness of paper and the interlayer density under actual working conditions. The application does not need an independent thickness parameter, does not increase the hardware cost, can realize seamless emergency control when the sensor fails, and has good effect verified by one-month running on an actual production line.
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Citation Information

Patent Citations

  • Rolling diameter computing method

    CN106477374A