Baler Pawl Cam Surface Geometry for Last Bale Ejection
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Solution Overview
Problem
Existing baler implements struggle to efficiently eject the last bale formed, as there is no subsequent bale to push it out of the discharge chute.
Innovation Solution
A bale ejection system comprising a frame, a pin, a carrier, and a pawl with a cam surface and a material engaging surface, which moves along a longitudinal axis to engage and disengage with the bale, ensuring effective ejection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional pawl design is used to eject the last bale, then the pawl may slip or fail to engage properly, but adding more complex engagement mechanisms increases device complexity
Solution Approach 1:
The pawl incorporates a crop engaging tooth with a concave notch specifically designed to match the geometry of crop material. This localized geometric feature provides enhanced engagement reliability at the critical interaction point between the pawl and bale, without requiring complex mechanisms throughout the entire device.
Solution Approach 2:
The cam surface is designed with a substantially arcuate profile that defines a radius between 150mm and 210mm. This curved geometry ensures smooth rotational movement of the pawl about its rotation axis, maintaining consistent contact with the pin while reducing stress concentrations and improving engagement reliability.
2Productivity
If the pawl engages deeply into the bale for secure grip, then ejection effectiveness improves, but the risk of crop rip-out increases
Solution Approach 1:
The crop engaging tooth features a concave notch with specifically designed crest and valley geometry that distributes engagement forces across multiple contact points within the crop material. This localized geometric design provides secure grip for effective ejection while minimizing stress concentrations that could cause crop rip-out.
Solution Approach 2:
The arcuate cam surface with radius between 150mm and 210mm enables the pawl to rotate smoothly into engagement, distributing the engagement force over a longer arc of motion rather than applying sudden impact. This curved geometry reduces shock loading on the crop material while maintaining effective grip for bale ejection.
3Volume of moving object
If the cam surface has a small radius for compact design, then device size is reduced, but the pawl rotation control precision decreases
Solution Approach 1:
The cam surface radius is optimized within the range of 150mm to 210mm, balancing compact design requirements with rotation control precision. This parameter optimization ensures the pawl rotates accurately about its axis while maintaining a reasonable device size suitable for baler implementation.
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 bale ejection system ensures that the last bale is efficiently ejected by providing a robust grip on the bale, reducing crop rip-out and improving the mechanical interaction between the pawl and the bale.
Implementation Method 1
The pawl includes a cam surface contacting the pin. Movement of the carrier and the pawl along the longitudinal axis moves the cam surface against the pin, causing the pawl to rotate about the rotation axis between a retracted position and an engaged position.
Data Source
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AI summary
A bale ejection system includes a pawl having a planar structure. The pawl includes a mounting bore extending therethrough. A center of the mounting bore defines a rotation axis. The planar structure of the pawl includes a cam surface and a material engaging surface disposed opposite the cam surface. The cam surface and the material engaging surface extend away from the rotation axis, and converge to define a distal end that is spaced from the rotation axis. The material engaging surface defines a crop engaging tooth positioned between the rotation axis and the distal end of the planar structure. The crop engaging tooth and the distal end of the planar structure are operable to engage crop material of a bale when the planar structure is rotated into engagement with the bale for moving the bale along a longitudinal axis of a baler implement.