Counter-Rotating Basecutter Plates for Stalk Cutting
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Solution Overview
Problem
Prior agricultural harvesters for stalk-like crops, such as sugarcane and sorghum, suffer from inefficiencies in cutting and processing, leading to crop material loss and damage due to lack of a positive kicking action for cut stalks and a large gap between basecutter plates, resulting in multiple cuts and splitting.
Innovation Solution
A basecutter assembly with counter-rotating plates and cutting knives that reduce the gap between the plates and provide a positive kicking action to ensure stalks are cut only once, minimizing field loss and damage by interleaving the knives and faces for efficient cutting and deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If prior art basecutters are used without a positive kicking action, then the structure is simpler, but the stalk is cut multiple times causing crop material loss and splitting damage
Solution Approach 1:
The basecutter assembly performs a preliminary kicking action on the stalk immediately after cutting, using the momentum of the rotating plates to propel the cut stalk onto the top surface of the cutting disk. This preliminary action prevents the stalk from falling into the gap between plates and being recut, thereby reducing crop material loss while maintaining a relatively simple structural design.
2Object-affected harmful factors
If a large opening exists between basecutter plates, then the structure is simpler with easier stalk passage, but the stalk falls into the opening and is split longitudinally causing damage
Solution Approach 1:
The invention offsets one plate relative to the other in the axial direction, creating a three-dimensional staggered configuration rather than a simple planar arrangement. This dimensional change allows the plates to overlap in part, reducing the effective gap where stalks could fall and be split, while still maintaining adequate clearance for stalk passage through the interleaved knife arrangement.
Solution Approach 2:
The knives on one plate are positioned to interleave with the knives on the other plate, creating a nested-like configuration where the cutting elements of one plate fit into the spaces between the cutting elements of the other plate. This nesting arrangement minimizes the effective opening between plates, preventing stalks from falling through and being split, while maintaining a compact overall structure.
3Reliability
If the first plate is offset relative to the second plate, then the knives do not interfere with each other enabling clean cutting, but the device complexity increases
Solution Approach 1:
The basecutter assembly employs asymmetric plate positioning where one plate is offset axially relative to the other, creating an asymmetric configuration that allows the knives on each plate to operate in different spatial zones. This asymmetry prevents knife interference and ensures reliable cutting operations, while the offset distance is optimized to balance cutting reliability with structural simplicity.
Data Source
AI summary
A harvester for harvesting stalks of stalk-like plants. The harvester includes a chassis, at least one ground contacting propulsion device connected to the chassis, and a basecutter assembly. The basecutter assembly is coupled to the chassis. The basecutter assembly includes a plurality of cutting knives and a pair of counter rotating plates. The pair of counter rotating plates include a first plate and a second plate, each of which have at least one of the plurality of cutting knives attached thereto. The first plate rotates about a first axis. The first plate has at least one portion thereof that extends in a radial direction such that the portion would interfere with the knife of the second plate except that the first plate is offset in a direction parallel to said first axis relative to said knife of said second plate.