Carding Machine Drum Occupancy Measurement via Fiber Parameter Analysis
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Solution Overview
Problem
Existing methods fail to accurately determine drum occupancy on a card during material changes, leading to potential quality losses due to incomplete processing of previous fibers, as they do not provide a clear method for controlling operating parameters based on fiber mass distribution and nep count values.
Innovation Solution
The method involves stopping the fiber supply and withdrawing all fibers from the drum space to measure the belt number and delivery route, allowing for the determination of drum occupancy by calculating the dead time and total fiber mass, which is then compared to reference values to adjust settings for optimal production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the carding machine operates continuously without interruption, then productivity is maintained, but accurate drum loading measurement cannot be performed leading to quality degradation
Solution Approach 1:
The system performs preliminary actions by continuously monitoring fiber parameters (nep count, fiber length distribution) and predicting drum loading conditions before actual quality degradation occurs. This allows the system to alert operators in advance, enabling them to plan maintenance or material changes during scheduled stoppages rather than causing unplanned production interruptions.
Solution Approach 2:
The system implements feedback by continuously measuring fiber parameters and comparing them against reference values to determine current drum loading conditions. This feedback loop provides real-time information about fiber mass on the drum, allowing the system to indicate when drum loading deviates from optimal ranges without requiring continuous production interruption for measurement.
2Measurement precision
If the carding machine is stopped to measure drum loading, then measurement accuracy is achieved, but production time is lost
Solution Approach 1:
The system replaces mechanical/physical drum emptying and direct fiber mass measurement with optical and electrical sensing methods. Sensors measure fiber parameters (nep count, fiber length distribution) and use these measurements to calculate drum loading, eliminating the need to physically stop and empty the drum for measurement purposes.
Solution Approach 2:
The system introduces intermediary measurements by using fiber parameter measurements (nep count, fiber length) as intermediate steps to indirectly determine drum loading. Instead of directly measuring fiber mass which would require drum emptying, the system measures these intermediary parameters and calculates drum loading from them, allowing continuous operation.
3Productivity
If material change is performed quickly, then productivity is maintained, but residual fibers from previous batch cause quality degradation
Solution Approach 1:
The system provides feedback during material changes by continuously monitoring fiber parameters and indicating when residual fibers from the previous batch are still present in the drum. This allows operators to determine the appropriate wait time or additional clearing actions needed before the new material is fully processed, ensuring quality consistency without excessive delays.
Solution Approach 2:
The system performs preliminary detection of residual fibers during material changes by measuring fiber parameters and calculating drum loading with previous batch material. This preliminary information allows operators to take appropriate actions (such as extended clearing time or additional fiber removal) before the new material batch is fully established, preventing quality degradation.
Data Source
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AI summary
The present invention relates to a method for determining the drum occupancy of a carding machine, wherein the supply of fibers into the carding machine is stopped and at the same time all the fibers located in the drum chamber of the carding machine are drawn out, wherein the sliver count and the delivery distance of the fibers at the carding machine exit are measured. Furthermore, the application relates to a carding machine, comprising a controller for determining the drum occupancy, wherein the controller is designed to compare the determined drum occupancy for each fiber quality with a separate specific reference value and, in the event of deviations between the determined drum occupancy and the specific reference value, to give the operator tips regarding the optimized setting of the carding machine, and/or the optimized setting is at least partially automatically carried out by means of sensors and actuators.