Disc Wood Chipper Radial Slots Counter Knives Energy Utilization
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Solution Overview
Problem
Disc type wood chippers inefficiently utilize energy, resulting in significant energy being wasted as heat, and are not effective in reducing wood chips to a small enough size for further processing into wood flour, especially when trying to directly hammer whole logs or large chips into powder.
Innovation Solution
A disc type wood chipping machine with radially extending slots containing primary and counter knives, hammers, paddle units, and serrated cutters that break down chips using centrifugal force and kinetic energy, further reducing chip size through a multi-step process within the machine before discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If large diameter discs with multiple knives are used to increase production rate, then output rate is improved, but energy consumption increases and energy utilization deteriorates
Solution Approach 1:
The disc is divided into multiple radial slots (10-40 slots) with knives arranged along the rim, creating multiple cutting zones that process wood simultaneously. This segmentation increases productivity while the counter-knives ensure efficient energy utilization by capturing and redirecting chip flow through the slots.
Solution Approach 2:
Counter-knives act as intermediaries between the primary knives and the discharged chips. They intercept chips exiting the slots and redirect them back through the disc, ensuring energy from the rotating disc is fully utilized for further size reduction rather than being wasted as heat.
2Productivity
If chips are produced at adequate output rate, then productivity is improved, but chip size reduction to flour grade deteriorates
Solution Approach 1:
Chips are preliminarily cut to desired length by primary knives at the slot entrance, then immediately subjected to further size reduction by counter-knives and hammers within the same processing zone. This preliminary action ensures chips are prepared for subsequent reduction to flour-grade size without requiring separate processing stages.
Solution Approach 2:
The chip reduction process continues uninterrupted as chips move through the slots and around the disc perimeter. Counter-knives continuously slice chips longitudinally, hammers continuously break them up, and the rotating disc continuously provides kinetic energy for size reduction, maintaining continuous useful action throughout the entire chip processing path.
3Power
If energy is supplied to the chipping machine, then chipping operation is performed, but energy utilization deteriorates due to heat discharge
Solution Approach 1:
The kinetic energy and heat generated by the rotating disc and chip impact are converted into beneficial size reduction forces. Counter-knives and hammers utilize the disc's rotational energy to break and slice chips, transforming what would be wasted heat and unused energy into effective mechanical work for chip reduction to flour-grade size.
Solution Approach 2:
The system uses its own rotational energy and kinetic output to perform the chip reduction function. The disc's rotation naturally provides the force needed for hammers to break chips and for counter-knives to slice them, making the system self-sufficient and eliminating the need for separate energy input for the reduction process.
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 machine effectively utilizes nearly all supplied energy to produce wood chips small enough to be efficiently converted into wood flour, reducing production costs and improving efficiency in industrial processes like chemical processing and pelletized fuel production.
Implementation Method 1
The chips are then delivered by centrifugal force into a flow channel that surrounds the outer back face and rim of the disc
Implementation Method 2
A roughened or serrated baffle plate is located at the entrance to the separator or bin upon which the entering chips are impinged to again still further reduce the size of the chips utilizing the kinetic energy stored in the chip stream
Data Source
AI summary
A disc type wood chipper that utilizes a high percentage of the energy required for chipping but not substantially utilized in the material size reduction within the machine to produce chips of a small enough size such that the chips produced can be turned into wood flour or wood pellets with the expenditure of very little additional energy.