Slitter Blade Radius Control for Uniform Cutting Speed
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Solution Overview
Problem
Existing slitters fail to maintain consistent cutting performance due to varying wear amounts on slitter blades, leading to oblique travel of corrugated paperboards during cutting, as the circumferential speed of blade edges differs between slitter heads.
Innovation Solution
A slitter system with multiple heads, each equipped with a drive motor and a circular slitter blade, where a blade radius acquisition unit measures the radii of the blades and a control unit adjusts the rotational speeds of the motors to ensure equal circumferential speeds across all blade edges, thereby reducing oblique travel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If all slitter blades are rotated at the same rotational speed, then the control system is simple, but the circumferential speed of blade edges differs due to wear, causing oblique travel
Solution Approach 1:
The control unit changes the rotational speed parameter of each drive motor based on the measured radius of each slitter blade. By adjusting the rotational speed according to blade wear (radius change), the circumferential speed of all blade edges is equalized, preventing oblique travel while maintaining relatively simple control logic.
2Reliability
If respective radii of slitter blades are measured and rotational speeds are adjusted, then cutting stability is improved, but the device complexity increases
Solution Approach 1:
The control unit implements a feedback mechanism where the radius of each slitter blade is measured, and this measurement is used to adjust the rotational speed of the corresponding drive motor. This closed-loop control ensures that circumferential speeds are equalized while keeping the control system relatively simple through automated feedback-based adjustment.
Data Source
AI summary
Disclosed is a slitter which comprises: a plurality of slitter heads arranged along and positionally adjustably in a width direction perpendicular to a conveyance direction of a corrugated paperboard, wherein each of the plurality of slitter heads includes a circular slitter blade and a drive motor for rotating the slitter blade; a blade radius acquisition unit operable to acquire respective radii of the plurality of slitter blades; and a control unit operable, based on the radii of the plurality of slitter blades acquired by the blade radius acquisition unit, to control respective rotational speeds of the plurality of drive motors so as to allow respective blade edges of the plurality of slitter blades to have the same circumferential speed.