Drum Chipper Process for Continuous Lignocellulosic Disintegration
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Solution Overview
Problem
Existing drum chippers require stopping the rotor to adjust process variables for optimal wood chip quality, leading to reduced production capacity and compromised chip quality due to the need to wait for changes, even when quality deteriorates.
Innovation Solution
A process that allows for continuous operation by adjusting the chipping angle, T dimension, and cutting speed of a drum chipper using radially adjustable wear plates and automated feeding systems, enabling real-time analysis and instantaneous adjustments to maintain desired chip configuration without stopping the drum chipper.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the drum chipper is stopped to adjust process variables for optimal chip quality, then chip quality can be optimized, but production capacity is reduced
Solution Approach 1:
The wear plates are made radially adjustable during operation, transforming a static component into a dynamic one. This allows the T dimension to be changed while the drum chipper continues running, enabling quality optimization without production stoppage
Solution Approach 2:
The invention enables changing process variables (T dimension, chipping angle, cutting speed) during operation rather than requiring shutdowns. The radially adjustable wear plates specifically allow continuous modification of the T dimension parameter
2Productivity
If the drum chipper operates continuously without stopping, then production capacity is maintained, but chip quality deteriorates due to inability to adjust process variables
Solution Approach 1:
The system incorporates real-time analysis of chip configuration and automatic adjustment of process variables based on the analysis results. This closed-loop feedback enables continuous quality maintenance during uninterrupted operation
Solution Approach 2:
The radially adjustable wear plates allow dynamic modification of the T dimension during continuous operation, enabling the system to adapt to varying wood material qualities while maintaining production flow
3Productivity
If there is a delay in adjusting process variables when quality deteriorates, then production continues, but chip quality is compromised
Solution Approach 1:
Real-time analysis of chip configuration provides immediate feedback on quality status, enabling prompt detection of quality deterioration and instantaneous adjustment of process variables without delay
Solution Approach 2:
The system performs preliminary analysis of chip quality during production, allowing adjustments to be made before significant quality deterioration occurs, maintaining consistent quality throughout continuous operation
Data Source
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AI summary
The present invention relates to a process for disintegrating lignocellulosic material (1) in a drum chipper. The process includes that the lignocellulosic material (1) is introduced to the drum chipper via an input device (2) and that the disintegrated lignocellulosic material is analysed (9) regarding its configuration. The disintegration takes place in a drum chipper comprising a stand carrying a horizontal, rotatable rotor (26), whose periphery has a plurality of knifes (30) and with each knife (30) cooperating radially adjustable wear plates (25) located at some distance from the knife edge, and a space for temporarily collecting the disintegrated lignocellulosic material between each pair of knives (30) and anvil steels. The process is characterized in that at least one process variable is changed during operation in the form of, that a certain cutting angle (ε) is set by regulation of the feeding device (2) position versus the rotor (26) and/or a specific T dimension is adjusted by changing the wear plate's (25) radial distance from the rotor (26) centre and/or that a certain cutting speed, i.e. the knife speed through the lignocellulosic material (1) is adjusted by changing the speed of the rotor (26).