Screen Box Vibration Mechanism With Adjustable Eccentric Phasing
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Solution Overview
Problem
Existing vibration generating mechanisms in vibrating screen machines often impede material flow due to their location beneath the deck, limiting the ability to generate linear or elliptical vibrations without requiring dismantling, and are typically restricted to circular motion when using a single rotor and cross tube.
Innovation Solution
A vibration generating mechanism featuring a drive shaft with first and second eccentric weights rotating in opposite or same directions, connected via gearing that allows for adjustable phase relationship through a gear carrier, enabling real-time alteration of vibration direction and type, including the option to generate circular motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple drive shafts and cross tubes are used to generate linear or elliptical vibrations, then vibration type flexibility is improved, but device complexity and material flow obstruction increase
Solution Approach 1:
The single drive shaft is segmented into multiple functional sections, each carrying different eccentric weights that can rotate independently. This allows the system to generate different vibration types (circular, linear, elliptical) using one drive shaft instead of multiple drive shafts, reducing complexity while maintaining versatility.
Solution Approach 2:
The single drive shaft is designed to perform multiple functions by supporting multiple eccentric weights that can operate in different configurations. The same drive shaft can generate circular vibration with one weight configuration, linear vibration with another configuration, and elliptical vibration with a third configuration, eliminating the need for multiple specialized drive shafts.
2Device complexity
If a single rotor and cross tube is used, then device complexity is reduced, but vibration type flexibility is limited to circular motion only
Solution Approach 1:
The system uses dynamically adjustable eccentric weights on the drive shaft that can be positioned and phased differently to change the vibration type in real-time. This dynamic configurability allows a simple single-drive-shaft structure to achieve multiple vibration types that would traditionally require complex multi-drive-shaft systems.
Solution Approach 2:
The vibration type is changed by adjusting parameters such as the phase relationship and position of eccentric weights on the drive shaft, rather than by changing the fundamental structure of having multiple drive shafts. This allows flexible vibration type selection while maintaining a simple single-drive-shaft structure.
3Strength
If cross tubes are positioned beneath the deck, then structural support is improved, but material flow through deck openings is impeded
Solution Approach 1:
The cross tubes are extracted from their traditional position beneath the deck and relocated to the sides of the screen box. This removes the obstruction to material flow through the deck openings while the cross tubes still provide necessary structural support for the drive shafts from the sides rather than from below.
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 solution allows for efficient material agitation and conveyance without blocking deck openings, enabling flexible vibration adjustment while maintaining efficient operation, and can generate various vibration types without dismantling, improving material processing efficiency.
Implementation Method 1
at least one first eccentric out of balance weight fixed with respect to the drive shaft for rotation therewith and at least one second eccentric out of balance weight coupled to the drive shaft via gearing whereby the first and second out of balance weights rotate in opposite directions or in the same direction when driven by the drive shaft
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A vibration generating mechanism (4) for a screen box (2) comprising a drive shaft (16) arranged to be rotatably driven by a drive motor, at least one first eccentric out of balance weight (20) fixed with respect to the drive shaft (16) for rotation therewith and at least one second eccentric out of balance weight (22) coupled to the drive shaft (16) via gearing whereby the first and second out of balance weights rotate in opposite directions when driven by the drive shaft (16).