Lumber Culling Carriage for Accurate Wood Defect Inspection
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Solution Overview
Problem
Structural components assembled from wood boards often suffer from inconsistencies and flaws such as bowing, twisting, cupping, waning, splits, and knots, which affect the shape, visual appearance, and integrity of the assembled components, making it challenging to ensure consistency and quality in manufacturing.
Innovation Solution
A lumber culling system comprising an infeed system with a robotic arm and a scanning system that captures image data to inspect wood boards for defects, determining whether they meet target criteria by comparing parameters to a set specification, and deciding on their usage or disposal, with the ability to orient the boards for optimal placement in downstream equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual inspection methods are used to examine wood boards, then operational flexibility is maintained, but manufacturing precision and consistency deteriorate due to human error and variability
Solution Approach 1:
The patent replaces manual mechanical inspection with an automated optical imaging system comprising cameras, lights, and a controller that captures and analyzes images of wood boards to detect defects such as bowing, twisting, cupping, waning, splits, and knots, thereby eliminating human variability while maintaining operational efficiency
Solution Approach 2:
The system creates digital copies (images) of the wood boards and their defects, allowing for precise analysis and measurement without physical contact or manual handling, enabling consistent detection of structural variations and flaws across all inspected boards
2Reliability
If all wood boards are processed through detailed inspection, then quality consistency is improved, but productivity decreases due to time-consuming examination of each board
Solution Approach 1:
The inspection system operates continuously as wood boards move through the processing line, with cameras capturing images and the controller analyzing defects in real-time without interrupting the flow of boards, thereby maintaining both high quality consistency and production speed
Solution Approach 2:
The system performs preliminary inspection of wood boards before they enter the assembly process, identifying and flagging defective boards early in the workflow, which prevents subsequent rework and ensures only qualified boards proceed to manufacturing
3Quantity of substance
If flawed wood boards are used in structural components, then material utilization is improved, but the strength and integrity of the assembled structure deteriorate
Solution Approach 1:
The inspection system evaluates specific local characteristics of each wood board including the presence, size, and location of defects such as knots, splits, and warping, allowing for precise determination of whether a board's local flaws compromise its suitability for structural applications
Solution Approach 2:
The system establishes and enforces specific parameter thresholds for defect acceptance, measuring and comparing actual board characteristics against these criteria to objectively determine whether boards meet the required strength and integrity standards for structural components
4Manufacturing precision
If automated inspection systems are implemented, then manufacturing precision is improved, but the ease of operation deteriorates due to increased system complexity
Solution Approach 1:
The inspection system is designed to operate autonomously, with the controller automatically capturing images, analyzing defect patterns, comparing measurements against criteria, and generating inspection results without requiring manual intervention or complex operational procedures, thereby simplifying operation despite the sophisticated technology employed
Data Source
AI summary
A lumber culling system may include a carriage with a distal wall and a proximal wall spaced apart from one another to form an interior of the carriage. An aperture may extend through the distal wall and the proximal wall. The aperture is sized and shaped to allow a board of wood to pass through the distal wall and the proximal wall. Further, the interior of the carriage is visible within the aperture. Imaging equipment may be disposed within the interior of the carriage and arranged to scan a portion of each side of the board of wood that is positioned within the aperture. The carriage may be moved along a length of the board of wood while the board of wood is at rest on static datum supports.