Mulching Device Backward-Inclined Tool Axis Stump Processing
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Solution Overview
Problem
Existing mulching devices for processing plant stumps have limited effectiveness in crushing stumps due to tools rotating vertically or slightly inclined forward, resulting in incomplete processing and leaving large pieces that can be used by the European corn borer for overwintering.
Innovation Solution
A mulcher with a rotatable tool having an axis of rotation tilted upwards and backwards, allowing initial processing at a first height and subsequent processing at a lower level, enabling multiple interactions with the stumps, and featuring a design that can be adjusted in height and orientation to follow the ground contour, with tools that can be blunt, striking, or cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If tools rotate about a vertical axis or slightly inclined forwards, then the tool structure is simple and easy to manufacture, but the processing effectiveness is limited and large pieces of stumps remain
Solution Approach 1:
The patent inverts the conventional tool axis orientation from vertical or forward-inclined to backward-inclined. This inversion allows the tool to first strike the stump at a higher point, then continue rotating to strike the same stump again at a lower point, achieving multiple interactions per rotation cycle and significantly improving processing effectiveness.
Solution Approach 2:
The patent introduces a backward inclination angle dimension to the tool axis orientation, transforming the conventional vertical or forward-inclined rotation into a three-dimensional motion pattern. This additional angular dimension enables the tool to engage stumps at multiple heights during rotation, effectively adding a vertical dimension to the processing action.
2Manufacturing precision
If the tool axis is vertical or slightly inclined forwards, then the tool interacts with each stump only once, but this limits the crushing degree and leaves large pieces
Solution Approach 1:
By inverting the tool axis inclination to backward, the patent enables the tool to strike the same stump multiple times during one rotation cycle - first at a higher point, then at a lower point. This multiple-strike mechanism significantly increases the degree of crushing while maintaining efficient processing speed through continuous rotation.
Solution Approach 2:
The backward-inclined tool axis ensures continuous useful action by maintaining engagement with stumps throughout the rotation cycle. The tool strikes stumps at multiple points in the rotation arc, eliminating idle rotation periods and maximizing the productive portion of each rotation, thereby achieving both high crushing degree and maintained productivity.
3Object-affected harmful factors
If tools are positioned to strike stumps once at ground level, then the device structure is simple, but large pieces remain that can be used by corn borers for overwintering
Solution Approach 1:
The backward-inclined tool axis creates a sweeping motion that strikes stumps at multiple heights, including upper portions that would otherwise remain untouched. This thorough multi-level processing eliminates large stump pieces that could serve as corn borer overwintering habitats, effectively addressing the harmful factor.
Solution Approach 2:
By adding the backward inclination angle dimension, the tool's path of action extends vertically through multiple stump height levels. This dimensional change ensures comprehensive processing from ground level up through the stump structure, eliminating residual pieces that could harbor pests.
Data Source
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AI summary
A mulching device is equipped with a tool that can be set into rotation about an axis of rotation tilted upwards and to the rear in order to process plant stubble. The rotational direction of the tool can be selected such that the tool is pressed back out of the ground by the driving torque in the event of an overload.