Oscillating Stalk Separator for Low-Crush Grape De-Stalking
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Solution Overview
Problem
Existing grape de-stalking technologies face issues such as excessive berry crushing, large space requirements, complex construction, high costs, and limited reliability, as well as inefficiencies in separating berries from stalks and debris due to pulping of grapes.
Innovation Solution
A linear stalk separator with alternating oscillating movements, featuring a conveyor belt and de-stalking device with spaced, oscillating separator arms driven by high-frequency motion, accompanied by a raking device to facilitate efficient berry-stalk separation without pulping, reducing space requirements and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional rotating drums or spiked rolls are used for de-stalking, then grapes can be separated from stalks, but excessive crushing of berries occurs
Solution Approach 1:
The patent applies high-frequency oscillating motion (5-30 Hz) to the separator arms through drive elements, creating a vibrating action that detaches berries from stalks through vibration-induced separation rather than direct mechanical contact and crushing. This vibratory mechanism effectively separates grapes while minimizing damage to the berries.
Solution Approach 2:
The separator arms perform periodic oscillating movements at high frequency (5-30 Hz), creating repeated contact and separation cycles that gradually detach berries from stalks without applying continuous crushing force. This periodic action allows berries to be released through vibration accumulation rather than single-force impact.
2Reliability
If traditional de-stalking machines are used, then separation function is achieved, but large space requirements are needed
Solution Approach 1:
The patent transitions from traditional horizontal or vertical drum configurations to a linear conveyor belt system with overhead separator arms, utilizing the vertical space above the conveyor to perform de-stalking. This dimensional reorganization allows the machine to be more compact in footprint while maintaining separation functionality through the linear progression of grapes along the conveyor.
Solution Approach 2:
The patent combines the conveyor function with the de-stalking function in a single integrated linear system, where grapes are transported and separated simultaneously along the same linear path. This merging of functions eliminates the need for separate processing zones required by traditional drum-based systems, reducing overall space requirements.
3Reliability
If traditional spiked rolls or rotating drums are used, then de-stalking is performed, but constructive complexity increases
Solution Approach 1:
The de-stalking device is divided into multiple independent separator arm assemblies, each capable of oscillating independently. These modular segments can be mounted along the conveyor belt at different positions, allowing the system to handle varying grape loads and sizes. Each separator arm assembly functions as an independent module, simplifying construction and maintenance compared to a single complex rotating drum.
Solution Approach 2:
The patent replaces static or slowly rotating structures with dynamically oscillating separator arms that move at high frequency (5-30 Hz). This dynamic approach allows the separator arms to adapt to the movement and positioning of grape bunches on the conveyor, improving separation effectiveness while using simpler mechanical oscillation mechanisms rather than complex multi-speed rotating systems.
4Reliability
If grapes are agitated on oscillating grids with agitator fingers, then de-stalking occurs, but grapes are turned into pulp
Solution Approach 1:
The separator arms use high-frequency oscillating vibration (5-30 Hz) to detach berries from stalks through resonant shaking rather than aggressive mechanical agitation. This vibratory action separates grapes while maintaining their structural integrity, preventing the pulp formation that occurs with traditional agitator fingers that physically tear and crush the grape flesh during separation.
5Reliability
If pulped grapes are produced, then de-stalking is achieved, but debris separation becomes difficult
Solution Approach 1:
The high-frequency oscillating separator arms detach berries through vibration without crushing them into pulp, maintaining grape integrity and preventing the formation of sticky pulped material. This ensures that debris such as leaf fragments, wood pieces, and insect remains remain separate and easily removable, rather than being mixed into adhesive pulp that complicates subsequent cleaning and processing operations.
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 solution effectively separates grapes from stalks with minimal berry crushing, reduces space needs, lowers costs, and enhances reliability by using oscillating arms and a raking mechanism to channel grapes through a progressive de-stalking process, ensuring efficient separation and removal of debris.
Implementation Method 1
drive elements that permit transmission of a high frequency oscillating motion to said stacked separator arm assemblies... communicate to the latter an oscillating motion of a frequency between 5 and 30 Hertz
Data Source
AI summary
Stalk separator for the de-stalking of small fruit picked in bunches, in particular for the de-stalking of grapes. The invention includes a conveyor belt and a de-stalking device positioned above this conveyor belt. The de-stalking device includes at least two spaced assemblies positioned opposite each other, each assembly featuring a number of stacked separator arms. The mechanical drives communicate a high frequency oscillating movement to the assemblies of stacked separator arms.