Fruit Harvester Shaker Rod Clamping for Tool-Free Replacement
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Solution Overview
Problem
The removal and replacement of shaker rods in fruit harvesters is laborious and time-consuming due to the need for specific tools and mechanical connections, which are prone to damage under heavy loads and impacts.
Innovation Solution
A shaker assembly with a support featuring cavities that include an entry portion, clamping portion, and bottleneck area, allowing shaker rods to be easily clamped and unclamped using manual force, utilizing elastic deformation to secure the rods in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If mechanical connections (bolt connections) are used to attach shaker rods to supports, then the connection strength is sufficient to withstand heavy loads and impacts, but the removal and replacement of shaker rods becomes laborious and time-consuming requiring specific tools
Solution Approach 1:
The cavity is segmented into distinct functional zones: an entry portion for rod insertion, a bottleneck area for elastic deformation, and a clamping portion for secure retention. This segmentation allows the rod to be inserted easily through the entry portion while the bottleneck area provides a deformation zone that creates a friction lock, eliminating the need for tools during installation and removal
Solution Approach 2:
The cavity cross-sectional area changes along its length, creating a bottleneck area with smaller cross-section than the rod. This parameter change enables elastic deformation of the rod when forced through the bottleneck, creating friction-based retention in the clamping portion without requiring threaded connections or tools
2Power
If shaker rods are subjected to heavy loads and impacts during harvesting, then effective fruit detachment is achieved, but the rods require regular replacement which is time-consuming
Solution Approach 1:
The bottleneck area design enables the rod to self-lock through elastic deformation when inserted. The deformation creates friction forces that automatically retain the rod in the clamping portion without requiring additional locking mechanisms or tools, allowing operators to quickly replace rods during maintenance intervals between harvesting operations
3Ease of manufacture
If a simple cavity design is used for rod attachment, then manufacturing is easier and cost is reduced, but the rod may not remain securely attached under heavy loading conditions
Solution Approach 1:
The cavity design incorporates a dynamic retention mechanism where the bottleneck area causes elastic deformation of the rod during insertion. This deformation creates friction forces that dynamically adapt to loading conditions, providing reliable retention under heavy shaking loads while maintaining a simple monolithic cavity structure that is easy to manufacture
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
Enables quick and effortless replacement of shaker rods, maintaining secure attachment during harvesting operations without the need for specialized tools.
Implementation Method 1
The fact that the bottleneck area is narrower than the rod implies that the passage of the rod through the bottleneck area involves an elastic deformation of the rod and/or of the material of the support in the vicinity of the bottleneck area
Implementation Method 2
The clamping portion is shaped and dimensioned to clamp the rod by a radial clamping force
Data Source
AI summary
The shaker assembly comprises a support provided with at least one cavity and at least one shaker rod configured to be clamped into said cavity. The cavity comprises an entry portion and a clamping portion, oriented along different angles and partly overlapping each other. The entry portion is shaped and dimensioned to enable sliding the rod into and out of said entry portion, while the clamping portion is shaped and dimensioned to clamp the rod by a radial clamping force. The cavity further comprises at least one bottleneck area that is narrower than the shaker rod, enabling to move the rod from the entry portion to the clamping portion or vice versa by tilting the rod between said different angles, thereby forcing the rod to pass through said bottleneck area or areas.