Offset Star Arm Reel for Bending Rigidity and Weight Reduction
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Solution Overview
Problem
Existing cutting unit reels face challenges in minimizing weight while maintaining rigidity and optimizing the harvesting process, particularly due to the high weight of the reel support tube which contributes significantly to the overall weight and can lead to bending issues.
Innovation Solution
The reel design features star arms on the reel stars that are partially offset from each other, allowing for wider and more rigid star arms without restricting the motion of the reel tines, with reinforced star arms extending further axially to enhance force transmission and reduce weight by distributing moments effectively, and using double T-beam configurations for increased rigidity and tensile force absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the reel support tube is made more rigid to prevent deflection, then the uniformity of conveying distance is improved, but the weight of the reel increases
Solution Approach 1:
The reel structure is segmented into multiple functional components: reel stars with offset star arms, tine bars with reel tines, and a reel support tube. By distributing the load-bearing function across these segmented components rather than relying solely on the reel support tube, the tube's weight can be reduced while maintaining overall structural rigidity and uniform conveying distance.
Solution Approach 2:
The star arms are arranged with adjacent arms offset from one another in the axial direction, creating an asymmetric configuration. This offset arrangement allows the star arms to be wider and more rigid without interfering with the motion of reel tines on adjacent tine bars, thereby enhancing the rigidity of the reel structure without increasing the weight of the reel support tube.
2Productivity
If the cutting width is increased to optimize harvesting efficiency, then the productivity is improved, but the overall weight of the cutting unit increases
Solution Approach 1:
The offset arrangement of star arms is applied locally at specific positions along the reel, allowing for wider star arms that provide enhanced rigidity and force transmission capability. This localized structural optimization enables the reel to support increased cutting width without proportionally increasing the overall weight of the cutting unit.
3Strength
If the star arms are made wider to increase rigidity, then the bending rigidity of the reel is improved, but the space for reel tine motion is reduced
Solution Approach 1:
The offset arrangement of star arms in the axial direction creates asymmetric spacing that provides sufficient radial clearance for reel tine motion while allowing the star arms to be wider for enhanced rigidity. The offset configuration ensures that wider star arms do not interfere with the curved path of reel tines on adjacent tine bars.
Solution Approach 2:
The problem of space constraint is resolved by utilizing the axial dimension for offset arrangement, which allows the star arms to be wider in the radial direction without reducing the radial clearance available for reel tine motion. This dimensional approach enables both increased rigidity and maintained adaptability.
Data Source
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AI summary
The invention relates to a reel (8) for a cutting unit (2) comprising a reel support tube (12) with reel stars (13) arranged thereon, on the star arms (15) of which tine rods (14) extending parallel to the reel support tube (12) are arranged, wherein adjacent star arms (15) of at least one reel star (13) are arranged at least sectionally offset from each other.