Agricultural Baler Optical Shape Sensing for Uniform Bale Thickness
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Solution Overview
Problem
Current agricultural baler systems fail to accurately determine the shape of bales until the last group of flakes is compressed, leading to potential misalignment and issues in stacking and transporting due to variable thickness from side to side.
Innovation Solution
A bale shape sensing system with right and left devices mounted on the baler's walls to measure the relative movement of flakes, providing signals for directional adjustments to ensure uniform bale formation through a control mechanism and operator display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If pressure sensing is used to determine bale length, then the bale formation process is simple, but the measurement precision of bale shape is insufficient and measurement occurs too late
Solution Approach 1:
The patent replaces the mechanical pressure sensing system with an optical measurement system. Optical sensors mounted on the channel walls detect the position of flake ends using light reflection or transmission, providing precise real-time measurements of bale shape and thickness without the delays and inaccuracies of pressure-based methods.
Solution Approach 2:
The patent introduces optical sensors as an intermediary measurement device between the flake material and the control system. These sensors act as mediators that continuously monitor the bale formation process, providing real-time data on flake position and bale dimensions, enabling dynamic adjustments during compression.
2Device complexity
If pressure forces are sensed to determine bale length, then the system is simpler, but the manufacturing precision of bale rectangularity is compromised
Solution Approach 1:
The patent replaces mechanical pressure sensing with optical measurement systems that directly measure the position and shape of flakes. Optical sensors mounted on the channel walls detect the exact location of flake ends, providing precise real-time data on bale rectangularity and enabling immediate correction of shape deviations.
Solution Approach 2:
The patent implements a feedback control system where optical sensors continuously monitor bale shape and provide real-time information to the control mechanism. This feedback loop enables dynamic adjustment of the compression process to maintain precise rectangularity throughout bale formation.
3Device complexity
If measurement occurs at the last group of flakes, then the sensing mechanism is simpler, but the loss of time in bale formation is increased
Solution Approach 1:
The patent implements continuous optical measurement throughout the entire bale formation process. Optical sensors mounted on the channel walls continuously detect flake position and bale dimensions from the moment compression begins, eliminating the delay inherent in post-compression measurement methods and enabling real-time control adjustments.
Solution Approach 2:
The patent performs measurement actions during the compression process itself rather than after completion. Optical sensors continuously monitor bale shape formation in real-time, providing early detection of shape deviations that allow for corrective actions to be taken during the compression process, thereby reducing overall formation time.
Data Source
AI summary
A baler for agricultural material including a reciprocating plunger that compresses crop material in a channel into flakes which are stacked to provide a bale length of the desired size. The baler is towed from and powered by a steerable tractor having an operator display. The channel receiving the plunger has right and left walls which support star wheels having points projecting into the channel for the flakes and bale. The relative movement of the bale from right to left is determined and indicated to the operator of the vehicle to steer right, left or straight to ensure that bales have thickness that is uniform across their width.