Sieve Cleaning Rake with Laterally Movable Prongs

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Solution Overview

Problem

Existing sieve devices in sewers face challenges in maintaining parallel alignment of cleaning rakes with grate bars, leading to tilting issues due to production tolerances, which affects the efficient removal of material to be sieved.

Innovation Solution

The cleaning rake is designed with moveable cleaning prongs that can laterally adjust relative to the sieve surface and pulling units, allowing them to adapt to the course of grate bars and engage between spaces without tilting, ensuring proper alignment and operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the cleaning rake is positioned to move parallel to the longitudinal direction of the grate bars, then the cleaning operation is effective, but production tolerances cause misalignment and tilting of the cleaning rake

Engineering Contradiction:

Improvealignment stabilityVSAvoidparallel alignment

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The cleaning prongs are made movable relative to the cleaning rake frame, allowing them to dynamically adjust their position laterally. This dynamic adjustment compensates for misalignment between the cleaning rake and grate bars caused by production tolerances, preventing tilting and ensuring reliable operation

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The lateral position of the cleaning prongs is made variable through movable mounting, allowing the system to adapt to different alignment conditions. This parameter change enables the cleaning prongs to maintain proper engagement with the grate bars despite manufacturing variations

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If the cleaning prongs are rigidly fixed to the cleaning rake, then the structure is simple, but misalignment causes tilting and mechanical stress

Engineering Contradiction:

Improveprong mounting structureVSAvoidoperational stability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The cleaning prongs are mounted to move laterally relative to the cleaning rake frame, transforming the rigid structure into a dynamic system. This allows the prongs to self-adjust and follow the grate bar alignment, eliminating tilting and mechanical stress while maintaining structural simplicity

Inventive Principle:

Principle #15Dynamics

3Stability of the object's composition

If the cleaning rake maintains fixed position, then the structure is stable, but it cannot adapt to variations in grate bar alignment

Engineering Contradiction:

Improverake position stabilityVSAvoidalignment adaptation

Core Design Contradiction:

Stability of the object's compositionVSAdaptability or versatility

Solution Approach 1:

The cleaning prongs are made movable relative to the stable cleaning rake frame, creating a hybrid system where the overall structure remains stable while the cleaning elements can adapt laterally to grate bar misalignment

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The cleaning rake is divided into a stable frame structure and movable cleaning prongs. This segmentation allows the frame to maintain positional stability while the individual prongs can independently adjust their lateral position to adapt to grate bar variations

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS10065137B2Device for separating and removing material to be sieved from a flowing liquid contaminated with material to be sieved

Publication Date: 2018.09.04 HUBER SE

AI summary

A device for separating and removing material to be sieved from flowing liquid includes a screen forming a sieve surface and fixed to a frame with grate bars arranged beside one another and separated from each other. At least one cleaning rake with numerous cleaning prongs can be in a conveying direction along the screen via a drive. When the cleaning prongs pass the screen, they engage at least in sections between adjacent grate bars to remove the material to be sieved and held back by the screen, thereby conveying it towards a discharge. The cleaning prongs may be configured to be movable laterally back and forth with regard to the conveying direction and with regard to the screen.