Vibrating Screen Feeder for Sticky Bulk Solids
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Solution Overview
Problem
Conventional vibrating screens face limitations in adjusting feed rates for bulk materials with high viscosity or moisture content, leading to inefficiencies and increased energy consumption, and are prone to jamming and clogging, which disrupts continuous operation.
Innovation Solution
A vibrating screening feeder system utilizing an AC squirrel cage motor with variable frequency drive (VFD) and sub-resonant tuned steel coil springs, combined with automatic pulsing to clear blockages, allows for adjustable feed rates and efficient handling of sticky materials by operating near natural frequency to minimize energy consumption and maintain continuous flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional mechanical means are used to adjust feed rate by varying frequency or stroke, then feed rate control is achieved, but the system cannot effectively handle bulk materials with high viscosity or moisture content
Solution Approach 1:
The system dynamically adjusts both frequency and stroke parameters through the VFD controller to optimize performance for different material characteristics. The controller modifies operational parameters in real-time based on material properties, enabling the system to adapt to various bulk materials including those with high viscosity or moisture content without jamming
Solution Approach 2:
The invention changes the operational parameters (frequency and stroke) of the vibrating screen to resolve the contradiction. By varying these parameters, the system can handle different material types effectively while maintaining continuous operation without jamming or clogging
2Ease of operation
If electromagnetic drive is used with high frequency and short stroke, then vibration control is achieved, but energy losses are high and it is restricted to free-flowing materials only
Solution Approach 1:
The system employs periodic vibration action through the VFD-controlled motor, creating oscillating motion that efficiently moves and separates materials. This periodic action reduces energy losses compared to continuous high-frequency electromagnetic vibration while maintaining effective material handling
Solution Approach 2:
The invention changes the vibration parameters from high frequency/short stroke to variable frequency/variable stroke combinations, optimizing energy consumption while maintaining vibration control precision for different material types
3Adaptability or versatility
If mechanical adjustment devices are used to change spring rate or motor position, then feed rate adjustment is possible, but device complexity increases and maintenance cost rises
Solution Approach 1:
The invention replaces mechanical adjustment devices with an electronic control system (VFD controller) that adjusts feed rate by varying motor speed and vibration parameters electronically. This substitution eliminates complex mechanical components while maintaining full feed rate adjustability
Solution Approach 2:
The system achieves feed rate adjustment by changing electrical and vibrational parameters through the controller rather than through mechanical modifications, reducing device complexity while preserving adaptability
4Device complexity
If vibrating screen operates at fixed speed, then simple control is maintained, but it cannot adapt to varying material properties and throughput requirements
Solution Approach 1:
The system transitions from fixed speed to variable speed operation through the VFD controller, enabling dynamic adaptation to varying material properties and throughput requirements while maintaining relatively simple control architecture
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 system achieves efficient separation of particle sizes with reduced energy consumption, periodic cleaning to prevent clogging, and adaptable operation for varying material properties, ensuring continuous and optimized throughput.
Implementation Method 1
The screen housing is caused to vibrate by some sort of drive which shakes the housing
Implementation Method 2
sub-resonant tuned steel coil springs, combined with automatic pulsing to clear blockages, allows for adjustable feed rates and efficient handling of sticky materials by operating near natural frequency
Implementation Method 3
The prior art illustration shown in FIG. 1 shows a fixed base member 102, a motor 112 and a crank journal 114 driving a vibrating screen housing 108 which is movable relative to the fixed base 102 about rotating arms 104
Data Source
AI summary
A vibrating screen feed conveying apparatus for conveying and separating sticky “moisture laden bulk solids” which are sticky and wet flowing onto a vibrating screening feeder and into a hopper. The apparatus includes a bed on which material is conveyed, a longitudinal counterbalance supported on a plurality of isolation springs, a plurality of inclined drive springs extending between the bed and the longitudinal counterbalance, and a plurality of stabilizers for controlling movement of the drive springs along their central axes. A plurality of vibratory motors, each having rotatable eccentric weights are attached to the rear end of the longitudinal counterbalance. The eccentric weights rotate in phase with one another to vibrate the bed at a vibration frequency.