Paper Winder Torque Control for Stable Roll Replacement Winding
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Solution Overview
Problem
When paper is continuously wound by a plurality of winding cores and a winding roll is replaced, the operation state for the new winding core is often unsuitable, leading to issues like creases and paper winding jumble due to improper cutting by the traverse cutter.
Innovation Solution
Switching the control mode of the second motor from speed control to torque control and performing tension correction when the torque value exceeds a reference value during the cutting operation, ensuring the paper tension is within a target range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the web is cut by the traverse cutter when the winding roll is replaced, then the paper can be continuously wound by multiple winding cores, but creases and paper winding jumble occur on the paper wound by the new winding core
Solution Approach 1:
The system performs preliminary actions by switching the new winding core from speed control to torque control mode before the traverse cutter operates. This preliminary control mode change ensures the paper tension is properly regulated during the cutting process, preventing creases and winding defects that would otherwise occur during the roll replacement operation.
Solution Approach 2:
The invention changes the control parameter of the new winding core from speed control to torque control during the critical cutting operation. This parameter change allows the system to maintain appropriate paper tension levels during the traverse cutter operation, thereby preventing paper winding defects while maintaining continuous production capability.
2Ease of operation
If the new winding core operates in speed control mode during paper cutting, then the winding operation is simple, but the paper tension cannot be properly regulated causing winding defects
Solution Approach 1:
The system dynamically switches the control mode of the new winding core based on the operational phase. During normal winding operations, speed control is used for simplicity, but during the traverse cutter operation, the system automatically transitions to torque control to ensure proper paper tension regulation, thereby maintaining both ease of operation and winding reliability.
Solution Approach 2:
The control system incorporates feedback mechanisms that monitor the operational state and automatically adjust the control mode of the new winding core. When the traverse cutter is activated, the feedback signal triggers a switch from speed control to torque control, ensuring paper tension is properly regulated during cutting without requiring manual intervention.
Data Source
AI summary
A paper winder includes a first winding core that is provided in a first arm turning centering on a rotating shaft and on which the paper should be wound, a first motor that drives the first winding core, a second winding core that is provided in a second arm turning centering on the rotating shaft and on which the paper should be wound next to the first winding core, and a controller that performs rotation control for the first motor and a second motor. In the rotation control, after, according to the turning of the second arm, completion of the winding of the paper by the first winding core and after a position of the second winding core has reached a position where the paper should be wound, during an operation of a traverse cutter that cuts the paper near the second winding core, when a torque value of the second motor is equal to or larger than a torque reference value, the controller switches a control mode of the second motor from speed control to torque control and perform tension correction control for adjusting the torque value of the second motor such that tension of the paper falls within a target range.