Agricultural Pickup Reel Torque Suspension for Obstacle Absorption
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Solution Overview
Problem
Existing baler pickup mechanisms suffer from damage when encountering obstacles due to insufficient force to lift the pickup assembly, leading to bouncing and missed crop material, especially at higher baling speeds.
Innovation Solution
A mechanically driven and controlled pickup assembly using a continuous loop device, such as a chain, with a pivoting structural member and adjustable lever arm to lift the pickup reel when drive torque exceeds a predetermined level, positioning the tensioned side of the loop in the harvesting direction to absorb obstacles without bouncing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If floating springs or hydraulic floats are used to reduce damage when encountering obstacles, then the pickup assembly can lift in reaction to obstacles, but the pickup head bounces up and down causing crop material to be missed
Solution Approach 1:
The pickup reel is designed with dynamic characteristics that allow it to respond to obstacles through torque-induced rotation rather than vertical bouncing. The reel's rotational inertia and the elastic properties of the drive mechanism enable controlled movement over obstacles while maintaining continuous crop engagement, eliminating the bouncing effect that causes missed material.
Solution Approach 2:
The patent replaces the traditional vertical suspension system (floating springs or hydraulic floats) with a torque-based rotational mechanism. Instead of allowing vertical movement through elastic or hydraulic elements, the system uses the drive torque and reel rotation to accommodate obstacles, substituting a bouncing mechanical suspension with a rotational torque-absorbing mechanism.
2Productivity
If baling speed is increased to improve productivity, then more crop can be processed, but the negative bouncing consequence is amplified
Solution Approach 1:
The system's dynamic response is optimized for higher operating speeds by utilizing the rotational inertia of the pickup reel and the elastic characteristics of the drive mechanism. At higher baling speeds, the reel's rotational momentum and the torque-based compliance mechanism prevent bouncing while maintaining effective crop pickup, allowing productivity increases without sacrificing collection stability.
3Productivity
If the pickup reel uses stiff teeth to effectively pick up crop, then pickup efficiency is improved, but damage to tines and drive mechanism occurs when encountering obstacles
Solution Approach 1:
The patent replaces the rigid mechanical connection between the pickup teeth and the drive mechanism with a torque-based compliant system. The stiff teeth maintain their effective pickup geometry while the drive mechanism's elastic and rotational characteristics absorb impact forces from obstacles, preventing force transmission that would cause tine or drive mechanism damage.
Solution Approach 2:
The drive mechanism is designed with inherent compliance and torque-limiting characteristics that act as a cushion before obstacle impacts can damage the system. The elastic properties and rotational freedom of the reel create a protective buffer that prevents sudden force transmission to the stiff pickup teeth and drive components when obstacles are encountered.
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
Effectively raises the pickup assembly over obstacles to prevent damage and maintain continuous baling without the negative bouncing effect, ensuring efficient crop collection across varying terrain.
Implementation Method 1
a path of a continuous loop device is positioned so that a tight side of the device is located in the harvesting direction from both the first axis and the second axis
Implementation Method 2
the structural member is pivoted about the second axis in a generally upward direction when the harvesting pickup apparatus encounters an obstacle
Data Source
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AI summary
A method of dimensioning a suspension of an agricultural harvesting pickup apparatus on a baler determined to move in a harvesting direction on a field and to a baler operated according to a method of responding to obstacles encountered by an agricultural harvesting pickup apparatus. A method of responding to obstacles (O) encountered by a harvesting pickup apparatus (24) that moves in the harvesting direction, the method including the steps of driving a pickup reel (26), pivoting at least one structural member (32), and positioning a path of a continuous loop device (36). The pickup reel (26) is driven with a continuous loop device (36) about a first axis (30). The at least one structural member (32) pivots about a second axis (34), the pickup reel (26) being supported by the structural member (32). A path of the continuous loop device (36) is positioned so, that a tight side (38) of the continuous loop device (36) is located in the harvesting direction from both the first axis (30) and the second axis (34). The harvesting pickup apparatus (24) is so configured, that the structural member (32) is pivoted about the second axis (34) in a generally upward direction when the harvesting pickup apparatus (24) encounters an obstacle (O).