Optical Sensor for Bale Density Monitoring
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Solution Overview
Problem
Existing baler systems face challenges in forming uniform cylindrical bales due to operator reliance, mechanical sensor durability issues, and non-contacting sensor inaccuracies, leading to misshaped bales and premature deterioration.
Innovation Solution
A non-contacting bale shape indicating system using sensors that emit a beam to detect crop density along bale regions, calculating density values to monitor bale shape and display alerts to operators, improving reliability and uniformity without contacting the bale or belts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mechanical sensors are used to measure crop density, then measurement capability is achieved, but component durability and system reliability are reduced due to contact with belts and bale surface
Solution Approach 1:
The patent replaces mechanical contact sensors with optical sensors that use light beams to measure crop density. The optical sensors detect variations in light transmission through the crop material, eliminating mechanical linkages and contact with moving parts, thereby improving reliability while maintaining measurement capability
Solution Approach 2:
The patent introduces light as an intermediary medium to transfer information about crop density from the measurement zone to the sensor. The light beam passes through the crop material, and variations in light intensity provide information about crop density without requiring physical contact
2Reliability
If non-contacting sensors measure bale diameter, then system reliability is improved, but measurement accuracy deteriorates due to slack belts giving false large diameter readings
Solution Approach 1:
The patent replaces mechanical diameter measurement systems with optical sensors that measure the actual crop density distribution. The optical sensors detect the presence and density of crop material directly, rather than inferring diameter from belt position, eliminating the slack belt measurement error
Solution Approach 2:
The patent changes the measurement parameter from geometric diameter (which is affected by slack belts) to optical density (which directly reflects crop material distribution). This parameter change allows accurate measurement of actual crop density regardless of belt tension variations
3Ease of operation
If operators manually monitor bale shape, then bale formation control is achieved, but operator fatigue and lack of exactness cause improper feeding and misshaped bales
Solution Approach 1:
The patent implements an automated feedback system where optical sensors continuously monitor crop density distribution and provide real-time signals to the operator. This feedback replaces manual monitoring with objective, continuous data about actual crop density, enabling precise control without operator fatigue
Solution Approach 2:
The patent enables the bale formation system to self-monitor and self-report its performance through automated optical sensing. The system independently tracks crop density distribution and provides guidance information, reducing reliance on operator skill and experience
4Reliability
If ultrasonic sensors measure long distances, then non-contacting measurement is achieved, but signal quality deteriorates in the dusty environment of the baler
Solution Approach 1:
The patent changes the measurement approach from long-distance ultrasonic measurement to short-distance optical measurement. The optical sensors are positioned close to the crop material, minimizing the path length through dusty air and reducing signal degradation from particulate interference
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 system enhances bale uniformity, reduces sensor costs, and improves durability, enabling the formation of bales with consistent density and accurate guiding for operators.
Implementation Method 1
at least one sensor assembly for detecting in a non-contacting manner a bale being formed in a bale forming chamber of an agricultural baler, configured for emitting a beam and sensing the resulting beam reflection or absorption
Data Source
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AI summary
A bale shape indicator includes a sensor assembly 45 configured for use with a bale 70 being formed, to indicate, in a non-contacting manner, the amount of crop components 56 present in a predetermined area along at least one region 72,74 of the bale 70. The indications are capable of being manipulated to determine a density value for the at least one region 72,74 of the bale 70.