Bar Screen Filter Conveyor Belt Retaining System
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Solution Overview
Problem
At steeper angles, gravity becomes less effective in engaging rakes with bar screens and removing debris from wastewater bar screening machines, leading to inefficiencies in debris removal and potential clogging issues.
Innovation Solution
A conveyor belt retaining system with guides and counterweights biases the conveyor belt to maintain interdigitation with filter bars, and a deflection plate aids in pushing debris onto the tines, ensuring effective debris removal even at angles greater than 80°.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the bar screen machine is positioned at a steeper angle (greater than 80°), then gravity becomes less effective in engaging rakes with bar screens and removing debris, but the machine structure can be more compact and save space
Solution Approach 1:
The patent employs counterweights that pivot on the conveyor belt to provide a restoring force that counteracts the gravitational effect. These counterweights pivot from an initial position to a retracted position in response to upward movement of the conveyor, creating a mechanical balance that maintains rake engagement with the bar screen regardless of the machine's inclination angle.
Solution Approach 2:
The patent introduces dynamic elements including a deflection plate that pivots in response to debris load, and counterweights that pivot in response to conveyor movement. These dynamic components automatically adjust their positions to maintain optimal engagement conditions, allowing the system to adapt to varying operational conditions without manual intervention.
2Area of stationary object
If the bar screen machine operates at steeper angles, then space utilization improves, but the rakes fail to maintain proper interdigitation with filter bars
Solution Approach 1:
The counterweights provide a restoring force that counteracts the gravitational pull on the rakes. This mechanical balance ensures that the rakes maintain proper interdigitation with the filter bars even when the machine operates at steep angles, preventing the rakes from disengaging or tilting away from the bar screen.
Solution Approach 2:
The deflection plate pivots in response to the load applied by debris on the rakes, providing a feedback mechanism that adjusts the rake position. This automatic adjustment ensures continuous maintenance of proper interdigitation between the rakes and filter bars throughout the operational cycle.
3Device complexity
If the bar screen machine is positioned at steeper angles, then structural compactness increases, but debris removal effectiveness decreases
Solution Approach 1:
The counterweights create a mechanical balance that compensates for the reduced gravitational effect at steep angles. This allows the machine to maintain effective debris removal capability while operating at compact, space-saving angles greater than 80°, effectively decoupling the trade-off between structural compactness and removal effectiveness.
Solution Approach 2:
The dynamic deflection plate and counterweight system automatically adjusts to maintain optimal debris removal conditions regardless of the machine's inclination. This dynamic adaptation allows the system to operate effectively at steep angles without sacrificing debris removal performance.
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 ensures consistent and efficient debris removal from the bar screen assembly, preventing clogging and maintaining interdigitation with filter bars at steeper angles, thereby enhancing the operational efficiency of wastewater treatment processes.
Implementation Method 1
a counterweight connected to the at least one guide for biasing the inner run in a downstream direction
Implementation Method 2
The deflection plate has an initial condition pivoted towards the rakes and is pivoted in an upstream direction to a retracted condition in response to upward movement of the conveyor
Data Source
AI summary
An apparatus for removing debris from water in a channel includes a bar screen assembly having a plurality of spaced apart, elongated filter bars arranged in a parallel relationship. A continuous conveyor carries a plurality of rakes. Each rake includes a plurality of spaced-apart tines interdigitated with the filter bars as the rake is moved along the filter bars by the conveyor to remove debris from the bar screen assembly. A conveyor belt retaining system includes at least one guide engaging an upstream side of an inner run of the conveyor and a counterweight connected to the at least one guide for biasing the inner run in a downstream direction.