Bidirectional Rotor with Dual Impact Surfaces for Waste Grinding
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Solution Overview
Problem
Existing waste grinding apparatuses with rotors suffer from frequent blockages and interruptions due to jamming, which previous solutions have not adequately addressed, while also requiring a reliable, safe, and cost-effective design for processing various types of waste.
Innovation Solution
A rotor design featuring a central body with radial vanes equipped with hammerheads having knocker and wedge-shaped impact surfaces, which operate in alternating directions to maximize impact and cutting effects, reducing jamming and enhancing grinding efficiency, paired with an electric motor control system for optimized working cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional rotors with simple blade designs are used, then the device complexity is low, but jamming occurs frequently due to excessive localized accumulation of shredded material
Solution Approach 1:
The rotor is segmented into multiple functional zones along its length, including a feeding zone with spacers to prevent material accumulation, a grinding zone with hammers and knives, and a discharge zone. This segmentation prevents localized accumulation and jamming by distributing material flow and processing functions across different sections of the rotor.
Solution Approach 2:
Different portions of the rotor are equipped with different structures tailored to specific functions: the feeding zone has spacers and modified blade geometry to control material entry and prevent clogging, while the grinding zone has high-energy hammers and knives. This local differentiation addresses jamming at the feeding zone without compromising grinding efficiency elsewhere.
2Productivity
If high-speed rotation is used to increase grinding capacity, then productivity increases, but the risk of jamming and material accumulation also increases
Solution Approach 1:
The rotor design incorporates dynamic elements including variable blade angles, adjustable hammer positions, and flexible spacers that adapt to different material loads and processing conditions. This dynamic configuration allows the rotor to maintain high-speed operation while automatically adjusting to prevent material accumulation and jamming under varying load conditions.
3Ease of manufacture
If simple blade configurations are used, then manufacturing cost is reduced, but grinding efficiency and waste processing capability are insufficient
Solution Approach 1:
The rotor merges multiple grinding functions into a single integrated structure: hammers for impact grinding, knives for cutting, and spacers for material distribution. This consolidation provides high grinding efficiency for diverse waste types while using a unified rotor design that simplifies manufacturing compared to multiple separate components.
4Device complexity
If the rotor operates in single direction only, then the structure is simpler, but jamming occurs due to unidirectional material accumulation
Solution Approach 1:
The rotor operates in periodic alternating directions, rotating forward for a set period to grind material, then reversing to discharge accumulated shredded material from the discharge zone. This periodic bidirectional operation prevents unidirectional material accumulation and jamming while using simple rotation control logic that alternates between forward and reverse cycles.
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 rotor design effectively prevents jamming and increases operating efficiency, reducing maintenance and operational costs by ensuring high grinding capacity and reliability across different waste types.
Implementation Method 1
at least one pair of impact surfaces are defined in the hammerhead... the first, knocker impact surface is adapted to operate when the rotor rotates in a first direction... the second, wedge-shaped impact surface is adapted to operate when the rotor rotates in a second direction opposite to the first direction
Data Source
AI summary
A waste grinding apparatus (101) including a rotor having a central body (13) defining at least one radial vane (15a, 15b), provided, at its end (17a, 17b) distal relative to a rotation axis (“S”) of the rotor (11), with a hammerhead (19) in which a first, knocker impact surface (21) adapted to operate when the rotor (11) rotates in a first, clockwise or counter-clockwise direction, and a second, wedge-shaped impact surface (23) adapted to operate when the rotor (11) rotates in a second direction opposite to the first direction, are defined.