Comminution Mill Cable Impact Arms Shear Prevention
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Solution Overview
Problem
Existing grinders and comminution mills face issues such as blade shearing and the need for additional components like fans or impellers to generate airflow, leading to complexity and maintenance challenges.
Innovation Solution
A comminution mill with impact arms made of high-strength steel cable sections that rotate to generate airflow without fans or impellers, featuring baffles and obstructing members to aid in material separation and dust collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigid blades are used in the rotor, then cutting effectiveness is improved, but the blades may sheer off or be torn away during grinding operations
Solution Approach 1:
The patent replaces rigid blades with flexible cable assemblies that have a braided construction. These cables are attached to the rotor and extend radially outward, providing both flexibility and strength. The flexible nature of the cables prevents shearing and tearing while maintaining the ability to effectively grind and cut materials.
Solution Approach 2:
The patent uses composite cable assemblies constructed from multiple strands of high-strength wire or rope arranged in a braided pattern. This composite structure provides both the strength needed for effective material processing and the flexibility to prevent catastrophic failure during operation.
2Productivity
If fan or impeller components are added to generate airflow, then material movement and moisture removal are improved, but device complexity and maintenance requirements increase
Solution Approach 1:
The patent makes the rotor serve multiple functions: it not only provides the cutting and grinding action through its cable assemblies but also generates the necessary airflow to move material through the chamber and remove moisture. This eliminates the need for separate fan or impeller components, reducing device complexity while maintaining productivity.
Solution Approach 2:
The patent combines the functions of material processing and airflow generation into a single integrated rotor assembly. The rotation of the cable-equipped rotor creates both mechanical processing action and pneumatic flow, merging what would traditionally require separate components into one unified system.
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 cable-based impact arms reduce the risk of shearing, simplify maintenance, and efficiently separate and collect materials while generating airflow for effective comminution and dust management.
Implementation Method 1
rotation of the shaft and thus, the impact arms, at preferably about 1,700 revolutions per minute (RPM) generates an airflow through the comminution mill
Data Source
AI summary
A comminution mill is described that includes a vertically oriented cylindrical housing with an intake chute in a top wall and an outlet chute in a bottom wall thereof. A rotatable shaft with a plurality of radially extending cables is disposed coaxially within the cylindrical housing. A plurality of studs extends inwardly from the wall of the housing to slow and collect materials flowing through the comminution mill. The studs can be withdrawn to discharge materials collected thereon. Slits are provided in the walls of the housing to enable the exit of particulate materials from the housing. A hood is provided overlying the slits on the exterior of the comminution mill for collecting the particulate material. Operation of the comminution mill provides a self-generated airflow and can be configured to separate, grind, and dry materials disposed therein.