Stuffer Chute Density Detection via Rotational Resistance
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Solution Overview
Problem
Conventional stuffer chute systems in agricultural balers often trigger prematurely due to frictional forces, resulting in less dense bales with non-uniform density, as they rely solely on pressure detection mechanisms that are sensitive to the nature of the crop material.
Innovation Solution
A stuffer chute assembly with rotating devices, such as star wheels, that provide variable rotational resistance and are coupled with sensors to detect the density of crop material, triggering the stuffer cycle only when the material reaches a predetermined density threshold, ensuring compact and dense bale formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pressure detection mechanisms are used to trigger the stuffer cycle, then the system responds quickly to material accumulation, but the triggering occurs prematurely due to frictional forces and sensitivity to crop material nature, resulting in less dense bales
Solution Approach 1:
The patent replaces the conventional pressure detection mechanism with a rotational resistance detection system. Instead of using pressure sensors that are sensitive to frictional forces and material nature, the system uses rotating devices (such as star wheels) that rotate within the stuffer chute. A sensor detects the rotational resistance of these devices, which directly correlates to the density of crop material in the chute. This substitution eliminates the premature triggering problem while maintaining productivity.
2Productivity
If the stuffer cycle is triggered early to maintain continuous operation, then productivity is improved, but the bale density becomes non-uniform and decreases
Solution Approach 1:
The patent implements a feedback control system where a sensor continuously monitors the rotational resistance of rotating devices in the stuffer chute. This real-time feedback on material density allows the control system to trigger the stuffer cycle at the optimal moment - only when the desired density threshold is reached. This ensures both continuous operation and uniform bale density by preventing both premature and delayed triggering.
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
This solution ensures that bales are formed with consistent density by accurately detecting the fullness of the stuffer chute and activating the stuffer cycle only when the material reaches the desired density, preventing premature triggering and resulting in more uniform bale density.
Implementation Method 1
a sensor coupled to at least one of the plural rotating devices, the sensor configured to sense a parameter corresponding to density of the crop material in the duct
Implementation Method 2
each of the plural rotating devices comprising plural fingers along the circumference of the rotating device to engage crop material in the duct
Data Source
AI summary
A stuffer chute assembly including: a curvilinear duct defining a passageway, the duct having a lower inlet opening and an upper outlet opening, the duct including a lower surface with plural slots located proximal to the upper outlet; plural rotating devices arranged transversely across the duct, the plural rotating devices extending at least partially both through the plural slots and into the passageway, each of the plural rotating devices including plural fingers along the circumference of the rotating device to engage crop material in the duct; and a sensor coupled to at least one of the plural rotating devices, the sensor configured to sense a parameter corresponding to density of the crop material in the duct.