Crusher With Harmonic Blade Motion For High-Speed Material Reduction

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Solution Overview

Problem

Conventional crushers are limited by gravitational forces, resulting in low crushing speeds and capacities, with most achieving only 250 to 400 crushing functions per minute, and are inefficient in terms of weight, dimensions, and cost, with hydraulic power arrangements being less economical.

Innovation Solution

The crusher employs first and second rotating crushing blades with a second blade moving in a harmonic linear path, utilizing an eccentric shaft or connecting rod for movement, generating centrifugal force to accelerate material and increase crushing efficiency, allowing for 1000 to 1500 crushing functions per minute, and featuring adjustable rotation speed for optimized operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional crushers rely on gravitational forces for material movement, then the structure is simple, but the crushing speed is limited to 250-400 functions per minute

Engineering Contradiction:

Improvecrushing speedVSAvoidmechanical structure complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies mechanical vibration through an eccentric shaft that generates harmonic oscillation, causing the lower crushing blade to move up and down in a controlled vibratory motion. This vibration mechanism accelerates material between the blades, increasing crushing speed from 250-400 to 1000-1500 functions per minute while maintaining manageable structural complexity through the use of standard eccentric shaft mechanisms.

Inventive Principle:

Principle #18Mechanical vibration

Solution Approach 2:

The patent transitions from static gravitational force reliance to dynamic mechanical motion by implementing a movable lower crushing blade driven by an eccentric shaft. This dynamic system allows the gap between blades to vary harmonically, creating accelerated material movement and significantly higher crushing capacity while using proven dynamic mechanical components.

Inventive Principle:

Principle #15Dynamics

2Strength

If the second crushing blade moves with uncontrolled direction change, then the mechanism is simpler, but the structural loads increase significantly

Engineering Contradiction:

Improvestructural durabilityVSAvoidmovement control mechanism

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The patent implements periodic action through the eccentric shaft, which generates harmonic oscillation that smoothly accelerates and decelerates the lower crushing blade in a regular cycle. This periodic motion ensures controlled direction changes with gradual acceleration and deceleration phases, reducing impact loads on the structure while maintaining a relatively simple eccentric shaft-based mechanism.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The harmonic motion generated by the eccentric shaft provides beforehand cushioning by gradually decelerating the lower crushing blade before direction reversal. This controlled deceleration prevents sudden impacts and reduces structural loads, while the eccentric shaft mechanism inherently provides this cushioning effect without requiring additional complex damping components.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Ease of manufacture

If hydraulic power arrangements are used in conventional crushers, then the control is flexible, but the cost and power input are higher

Engineering Contradiction:

Improvecost efficiencyVSAvoidoperational adjustability

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The patent replaces hydraulic power arrangements with a direct mechanical drive system using an eccentric shaft. This substitution eliminates the need for hydraulic pumps, fluid systems, and associated controls, significantly reducing manufacturing cost and power input while maintaining operational flexibility through mechanical adjustment mechanisms for the eccentric shaft configuration.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical 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

This design significantly enhances crushing performance, durability, and cost efficiency, allowing for smaller, lighter crushers with higher output and adjustable parameters for optimized operation, reducing structural loads and power input while improving adjustability and safety.

Implementation Method 1

utilizing an eccentric shaft or connecting rod for movement, generating centrifugal force to accelerate material and increase crushing efficiency

Methodology Applied

Scientific EffectCentrifugal force: Centrifugal Force

Data Source

PatentUS8109454B2Crusher, method for crushing material and method for controlling a crusher

Publication Date: 2012.02.07 METSO OUTOTEC FINLAND OY

AI summary

A crusher comprising at least a first crushing blade and a second crushing blade which are arranged to be rotary, one of the crushing blades being also arranged to move back and forth along a substantially harmonic linear path, and the rotating axes of the first crushing blade and the second crushing blade being parallel with the linear direction of movement of the second crushing blade. The second crushing blade is adjusted to move substantially harmonically back and forth along a linear path.