Screen Assembly for Simultaneous Sand Grading and Dewatering
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Solution Overview
Problem
Existing screen technologies cannot effectively grade and dewater particulate materials, such as sand, in a single stage, as they either focus on grading or dewatering without integrating both functions on a single deck.
Innovation Solution
A screen assembly with a deck divided into two portions, where the first portion is inclined downwardly for grading and the second portion is inclined upwardly for dewatering, with varying aperture sizes and angles to facilitate the separation of oversized and undersized particles, utilizing a vibration generating device to convey materials across the deck.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single deck is used for both grading and dewatering, then processing efficiency is improved, but the complexity of deck design and material separation control worsens
Solution Approach 1:
The deck is segmented into two distinct portions: a first portion with a downward inclination for grading and a second portion with an upward inclination for dewatering. This segmentation allows each portion to be optimized for its specific function while being integrated into a single deck structure, thereby improving processing efficiency without excessive complexity
Solution Approach 2:
Different regions of the deck are given different local qualities: the first portion has a downward inclination angle optimized for material conveyance and grading, while the second portion has an upward inclination angle optimized for dewatering. The aperture sizes also vary between portions to match the specific requirements of each function
2Speed
If the deck is inclined downwardly for grading, then material conveyance speed is improved, but dewatering effectiveness worsens
Solution Approach 1:
The deck is divided into two portions with different inclination directions: the first portion inclined downwardly to achieve high material conveyance speed for efficient grading, and the second portion inclined upwardly to provide stable material retention and effective dewatering. This segmentation resolves the contradiction between speed and dewatering effectiveness
Solution Approach 2:
Instead of using a uniformly downward inclined deck that prioritizes speed, the invention inverts the inclination in the second portion to upward, creating a configuration where the first portion optimizes for conveyance speed and the second portion optimizes for dewatering effectiveness
3Reliability
If the deck is inclined upwardly for dewatering, then dewatering effectiveness is improved, but material conveyance speed worsens
Solution Approach 1:
The deck is segmented such that the first portion has a downward inclination for fast material conveyance and grading, while the second portion has an upward inclination for effective dewatering. This ensures that material is conveyed quickly through the grading section before entering the dewatering section where slower processing is acceptable and beneficial
4Measurement precision
If aperture sizes are varied across the deck, then separation precision is improved, but manufacturing complexity worsens
Solution Approach 1:
The deck is designed with different aperture sizes in different portions: larger apertures in the first portion for grading and smaller apertures in the second portion for dewatering. This local differentiation of aperture sizes optimizes separation precision for each function while maintaining a relatively simple manufacturing approach by using standard aperture patterns in each region
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
Enables simultaneous grading and dewatering of sand on a single deck, improving efficiency by allowing oversized particles to be conveyed and dewatered effectively while undersized particles are separated, with optimized aperture sizes and angles enhancing the separation process.
Implementation Method 1
the frame being provided with a vibration generating device for imparting vibration to the deck
Implementation Method 2
oversized particles are conveyed over the first portion of the deck under the action gravity
Implementation Method 3
undersized particles of sand passing through the apertures in the first portion of the deck
Implementation Method 4
The deck is vibrated at high frequency to shake out excess water through the openings
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A screen assembly (10) for grading and dewatering sand comprising a frame upon which is mounted a deck (12) having a plurality of apertures therein, the frame being mounted on a base and being provided with vibration generating means (30,32) for imparting vibration to the deck, wherein the deck (12) comprises a first portion (20) inclined downwardly from a first end to second end for grading sand thereon and a second portion (22) for dewatering sand thereon, wherein the first portion (20) of the deck (12) is inclined downwardly at a first angle to the horizontal with respect to the normal direction of travel of material on the deck and the second portion (22) is arranged substantially horizontally or inclined upwardly at a second angle to the horizontal with respect to the normal direction of travel of material on the deck (12) wherein, in use, sand may be delivered onto the deck (12) at or adjacent the first end of the first portion (20), undersized particles of sand passing through the apertures in the first portion (20) of the deck as oversized particles are conveyed over the first portion of the deck under the action gravity before passing onto the second portion (22) of the deck (12), whereby the oversized particles are dewatered.