Screen Bar Fixing Structure for Wastewater Screening
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Solution Overview
Problem
In wastewater treatment screening apparatuses with fine screening capabilities, thin screen bars with gaps of 1 mm to 10 mm are prone to sagging and entanglement with long impurities like hairs, leading to rake damage and clogging, which results in wastewater overflow.
Innovation Solution
A structure where the lower ends of screen bars are fixed to the rear part of the screening apparatus, upper ends are bent and secured to prevent interference with rake travel, and medial portions are supported by perpendicular bars to maintain straightness and reduce entanglement, eliminating the need for welding and minimizing support bar count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If screen bars are arranged with small gaps (1 mm to 10 mm) for fine screening, then fine suspended solids can be removed effectively, but impurities like hairs easily entangle around support bars and clog the gaps
Solution Approach 1:
The screen bars are bent into an arc shape rather than being straight, creating a curved surface that prevents impurities like hairs from easily entangling and clogging the gaps between bars while maintaining the fine screening capability
Solution Approach 2:
The support bars are removed from the structure entirely. Instead of using traditional support bars perpendicular to the screen bars, the invention fixes the screen bars directly to the rear part of the screening apparatus at their lower ends, eliminating the source of impurity entanglement
2Stability of the object's composition
If support bars are welded to screen bars to maintain straightness, then screen bar stability improves, but impurities entangle around the support bars causing rake damage
Solution Approach 1:
The support bars are completely removed from the structure. The screen bars are fixed directly to the rear part of the screening apparatus at their lower ends, eliminating the intermediate support bars that caused impurity entanglement while maintaining screen bar stability through proper anchoring
Solution Approach 2:
The screen bars are formed with an arc shape that naturally resists deformation and maintains straightness in the screening direction without requiring perpendicular support bars, thereby eliminating impurity entanglement points
3Stability of the object's composition
If screen bars are fixed at both upper and lower ends, then structural stability improves, but upper ends interfere with rake travel path
Solution Approach 1:
The fixation at the upper ends of screen bars is removed. Only the lower ends are fixed to the rear part of the screening apparatus, which provides sufficient structural stability while clearing the upper portion for uninterrupted rake travel along the screen bars
Solution Approach 2:
The screen bars are arranged in an inclined configuration rather than vertical, allowing the fixed lower ends to provide stability while the inclined upper ends clear the horizontal rake travel path, separating the stability function from the rake operation space
Data Source
AI summary
Disclosed herein is a structure for fixing screen bars of a screening apparatus, which is installed in a wastewater treatment plant to remove impurities contained in wastewater and includes a screen panel formed by arranging the screen bars parallel to each other to have gaps ranging from 1 mm to 10 mm therebetween. The screen bar fixing structure of the present invention is constructed such that screen bars, which are thin and long shapes, can maintain the straightness and gaps therebetween constant even though the screen bars are not welded to support bars provided on the rear surfaces of the screen bars, thus solving the problem in which impurities such as hairs, which are relatively long, are wound around the support bars, with the result that rakes undesirably flip or are damaged, or the gaps between the screen bars become clogged.