Coffee Grinder Reverse-Rotation Cleaning to Reduce Residue Oxidation
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Solution Overview
Problem
Existing grinding apparatuses suffer from residual ground product accumulation in the grinding chamber, leading to oxidation, overheating, and inconsistent granulometry, which deteriorates the quality of the ground product and beverage extraction.
Innovation Solution
A grinding apparatus with a mobile grinder and cleaning device that rotates in opposite directions for grinding and cleaning, combined with antistatic flaps and an inclined chamber design, ensures complete discharge of ground product and maintains organoleptic quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the mobile grinder rotates only in the grinding direction to engage with the fixed grinder, then grinding efficiency is maintained, but ground product residues accumulate in the unloading compartment
Solution Approach 1:
The mobile grinder is designed to rotate in reverse direction during a cleaning phase after grinding. This reverse rotation causes the cleaning blades to scrape the unloading compartment walls and floor, dislodging accumulated ground product residues that would otherwise remain trapped during normal grinding operation
Solution Approach 2:
The grinding apparatus alternates between a grinding phase (mobile grinder rotates in grinding direction) and a cleaning phase (mobile grinder rotates in reverse direction). This periodic switching between opposing rotational directions enables both productive grinding and automatic residue removal without manual intervention
2Duration of action of stationary object
If ground product remains in the unloading compartment, then the apparatus can operate continuously, but oxidation and overheating occur deteriorating product quality
Solution Approach 1:
The reverse rotation cleaning phase is automatically executed immediately after each grinding phase, ensuring continuous removal of ground product residues from the unloading compartment. This eliminates idle time where residues would accumulate and undergo oxidation or overheating, maintaining continuous useful action of both grinding and cleaning
Solution Approach 2:
The apparatus performs its own cleaning function by utilizing the mobile grinder's reverse rotation to activate the cleaning blades. The system is self-servicing, automatically removing residues without requiring separate cleaning mechanisms or manual intervention, thereby preventing oxidation and overheating during continuous operation
3Productivity
If ground product is ground multiple times in subsequent cycles, then the apparatus maintains continuous operation, but granulometry becomes inconsistent
Solution Approach 1:
The reverse rotation of the mobile grinder actively extracts and removes ground product residues from the unloading compartment and grinding chamber after each grinding cycle. This complete extraction prevents leftover particles from being inadvertently re-ground in subsequent cycles, maintaining consistent granulometry while allowing continuous operation
Solution Approach 2:
The cleaning phase with reverse rotation is performed as a preliminary action before the next grinding cycle begins. By removing all residues in advance, the system ensures that only fresh ground product enters the next grinding cycle, preventing contamination from previously ground material and maintaining granulometry precision
4Reliability
If cleaning blades are added to remove residues, then ground product quality is maintained, but device complexity increases
Solution Approach 1:
The cleaning function is merged with the existing mobile grinder assembly. The cleaning blades are integrated onto the mobile grinder, which already contains the grinding mechanism. This combination eliminates the need for separate cleaning mechanisms, reducing overall device complexity while maintaining ground product quality through effective residue removal
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 apparatus effectively removes residual ground product, preventing oxidation and overheating, ensuring precise dosing and consistent beverage quality by maintaining the organoleptic characteristics of the ground product.
Implementation Method 1
the grinding teeth of the mobile grinder engage with the grinding teeth of the fixed grinder to ground the product
Implementation Method 2
one or more antistatic flaps that eliminate the electrostatic charge associated to the particles of ground product
Data Source
AI summary
A method for use of an apparatus comprises: a grinding step, a cleaning step, and a de-ionizing step; the apparatus comprises a receptacle to contain the product to be ground and provided with an unloading aperture; a fixed grinder; a mobile grinder rotatable around a rotation axis connectable to a drive motor; a cleaning device connected to the mobile grinder; a grinding chamber in which the fixed grinder, the mobile grinder and the cleaning device are located and provided with a discharge aperture to discharge the ground product.