Frustoconical Rotor Nut Cracking Mechanism

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Solution Overview

Problem

Existing nut cracking and hulling systems are inefficient for black walnuts, particularly due to their non-splitting, thick shells, and often damage the nut meat or mix it with shells, and are not adaptable to different types of nuts, leading to high maintenance and low production rates.

Innovation Solution

A compact, low-cost nut cracking system with a hollow main housing, a gearbox, and a frustoconical rotor with elongate edged bars and vertical protrusions that apply torque to crack black walnut shells efficiently, separating nut meat from shells without damage, and is applicable to various nut sizes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If existing nut cracking systems are used on black walnuts, then cracking force is applied, but the thick non-splitting shells resist cracking and the nut meat is damaged or mixed with shells

Engineering Contradiction:

Improvecracking efficiencyVSAvoidnut meat damage

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The cracking action is segmented into multiple stages: initial impact by the rotor bar, followed by compression between the cracked nut and the housing wall. This multi-stage approach allows the thick shell to be broken progressively without excessive force that would damage the meat.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The cracking force is applied locally at specific points: the rotor bar impacts a localized area of the nut, and the cracked nut is then compressed against a specific location on the housing wall. This concentrated local force is more effective than distributed force while minimizing meat damage.

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If existing nut cracking systems are used, then cracking action is performed, but the apparatus is not adaptable to different types of nuts

Engineering Contradiction:

Improvenut type adaptabilityVSAvoidapparatus configuration

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The rotor bar is designed with dimensions and properties that make it effective for multiple nut types. The general cylindrical shape and material properties allow it to function with various nut sizes and shell thicknesses without requiring apparatus reconfiguration.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system accommodates different nut types by varying operational parameters such as rotor speed and feed rate rather than changing the physical apparatus. This allows the same device to handle different nut types efficiently.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If high speed cracking is implemented, then production rate increases, but maintenance requirements increase and efficiency is lost over time

Engineering Contradiction:

Improveproduction rateVSAvoidoperational efficiency

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The housing wall serves a dual function: it acts as a structural component of the apparatus and simultaneously as a cracking surface that receives the cracked nuts. This self-service approach eliminates the need for separate cracking surfaces that would wear and require maintenance.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The rotor bar is designed as a simple, replaceable component that can be easily replaced when worn. Its simple geometry and material allow for economical replacement without requiring complex maintenance procedures or specialized tools.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 system achieves high-speed, efficient extraction of nut meat from shells with minimal supervision, maintaining efficiency over long periods without requiring frequent maintenance, and is adaptable to different nut sizes, achieving over 99% hulling efficiency with reduced part wear.

Implementation Method 1

a frustoconical rotor with elongate edged bars and vertical protrusions that apply torque to crack black walnut shells efficiently

Methodology Applied

Scientific EffectTorque: Torque

Implementation Method 2

elongate edged bars and vertical protrusions that apply torque to crack black walnut shells

Methodology Applied

Scientific EffectMechanical Force: Mechanical Force

Data Source

PatentUS10568353B1Hard-shelled nut meat extractor

Publication Date: 2020.02.25 DAILEY CARLETON

AI summary

A system for hard-shelled nut cracking and nut meat extraction having a substantially hollow main housing, a hopper contained in the upper section of the housing, a concentric cylindrical rotor housing in the midsection of the main housing lined with a series of protrusions on the inner walls, a frustoconical shaped rotor, the rotor made up of elongate edged rods evenly spaced to have short rectangular shaped rods fixed in between the interstitials at a lower side of the rotor, the rotor is driven by a motor at the lower section of the main housing that connects to a gearbox which further connects to a vertical drive shaft that translates rotation to the rotor, the rotor and inner wall protrusions of the rotor housing are used for the cracking and meat extraction of hard-shelled nuts which are ejected from the midsection of the main housing to the collection tray.