Multi-Tier Counter Knife System for Uniform Wood Chip Production
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Solution Overview
Problem
Disc wood chippers produce wood chip slices that are often too wide and require additional energy to reduce in size for downstream processing, with existing counter knife systems being inefficient in utilizing the energy carried by the chip slices and resulting in non-uniform chip sizes.
Innovation Solution
A counter knife system with multiple tiers of chip contact elements of varying heights is mounted within the chip slots of a rotary disc chipper, where the first series of elements reduces the size of wood chip slices, and a second series further reduces the size of the chips, efficiently utilizing the kinetic energy and producing uniform-sized chips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single-tier counter knife system is used to reduce chip slice width, then the chip width is reduced, but the energy utilization is inefficient and chip size uniformity is poor
Solution Approach 1:
The counter knife system is segmented into multiple tiers (first tier, second tier, and optionally third tier) with each tier containing multiple contact elements. This segmentation allows progressive reduction of chip slices through multiple stages, improving both energy utilization and chip size uniformity compared to a single-tier system.
Solution Approach 2:
Each tier of the counter knife system has contact elements with specific local characteristics - the first tier contact elements have a first height, the second tier contact elements have a second height less than the first, and the third tier contact elements have a third height less than the second. This local quality variation optimizes energy distribution and chip reduction at each stage.
2Manufacturing precision
If additional downstream processing is used to reduce chip size, then chip size is reduced, but energy consumption increases substantially
Solution Approach 1:
The multi-tier counter knife system performs preliminary size reduction action within the chipper itself, reducing chip slices to smaller uniform chips before they leave the chipper. This preliminary action eliminates or reduces the need for additional downstream processing, thereby reducing overall energy consumption.
Solution Approach 2:
The chipper system serves itself by incorporating the size reduction function directly into the chipper through the multi-tier counter knife system. The kinetic energy of the rotating disc and chip slices is utilized efficiently by the counter knife system to perform the size reduction, making the system self-sufficient and reducing external energy requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The multi-tiered counter knife system effectively reduces the size of wood chips without additional energy expenditure, producing uniform and high-quality chips by efficiently distributing the energy across the blade array, improving upon the inefficiencies of single-tier systems.
Implementation Method 1
efficiently utilizing the kinetic energy and producing uniform-sized chips
Data Source
AI summary
A wood chipper having a rotatable disc that contains a series of slots that pass through the disc. A primary chipper knife is located at the entrance of each slot which separates slices from a work piece and directs the slices through the slot. A counter knife unit is mounted within each slot for engaging the slices leaving the primary chipper knife to reduce the size of the chips as they move through the slot. The counter knife unit contains a first series of spaced apart chip contact elements that have a first height to contact the slices as they leave the primary chipper knife to reduce the size of the slices. The counter knife further contains a second series of chip contact elements that have a second height that is less than that of the chip contact element in the first series. Each contact element in the second series is arranged to contact chips leaving the contact elements in the first series to further reducing the size of the chips.