Multi-Pulley Control Gate for Flood-Protected Deep Channels
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Solution Overview
Problem
Existing control gates are limited in size and susceptible to damage during flood conditions due to submerged motors and electronics.
Innovation Solution
A control gate design featuring a cable system with dual sheave pulleys and motors mounted above the flood line, allowing for a larger barrier member and deeper channel operation, with cables guided by flanges and grooves to maintain tension and mechanical advantage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If motors and electronics are mounted at the base of the channel, then the control gate can be compact and simple in structure, but the motors and electronics are susceptible to damage during flood conditions
Solution Approach 1:
The motors and electronics are extracted from the base level and relocated to a protected position above the maximum flood line. This separation removes the vulnerable components from the flood-prone zone while maintaining their functional connection to the barrier member through the cable-pulley mechanism.
Solution Approach 2:
A cable-pulley system acts as an intermediary mechanism between the protected motors and the barrier member. The cable transmits force from the motors (located in protected positions) to the barrier member, allowing the motors to remain above flood level while still controlling the barrier effectively.
2Length of moving object
If traditional single pulley systems are used, then the device is simpler, but the gate size is limited and cannot operate in deeper channels
Solution Approach 1:
The system transitions from a single-pulley configuration to a dual-pulley arrangement, adding a vertical dimension to the cable path. The cable passes over both an upper pulley and a lower pulley, creating a more complex but effective mechanical system that provides greater mechanical advantage and enables operation in deeper channels.
Solution Approach 2:
The lower pulley features a circular arcuate section with flanges that guide the cable along a curved path. This curved geometry ensures the cable maintains proper contact and tension throughout its path, enabling the system to handle larger gate sizes and deeper channel operations while maintaining cable integrity.
3Reliability
If the cable is not properly guided, then the system is simpler, but the cable cannot maintain tension and contact with the pulleys
Solution Approach 1:
The lower pulley incorporates a circular arcuate section with integrated flanges that curve to match the cable's path. This curved guidance structure ensures the cable maintains continuous contact and proper tension as it passes from the upper pulley to the barrier member, preventing slippage and maintaining mechanical advantage.
Solution Approach 2:
The flanges on the circular arcuate section provide localized guidance at critical points where the cable transitions. These localized structural features ensure proper cable alignment and contact specifically at the pulley interfaces, while the rest of the system maintains its overall simplicity.
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 operation under flood conditions by protecting motors and electronics, enabling larger gate sizes and deeper channel control.
Implementation Method 1
said cable being looped under tension at least once around said first pulley located above said second pulley, said cable then passing under said second pulley in contact with the opposite face of said second pulley to be secured to said second end of said arcuate section in order to maintain said cable in a substantially peripheral contact with said circular arcuate section, said second pulley transferring rotary motion of said first pulley into motion of said side member or offset member
Data Source
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AI summary
A control gate adapted to be installed across a channel for liquids, the control gate comprising a barrier member with a side member or offset member that has a circular arcuate section, said barrier member being pivotally mounted at or adjacent to the base of said channel; and a drive for raising and lowering said barrier member to regulate flow of liquid through said control gate, said drive including a cable, motor and first and second pulleys, said first pulley coupled to said motor, said cable secured to opposite first and second ends of said circular arcuate section under tension with said second pulley being adjacent to said circular arcuate section, said cable passing along said circular arcuate section from said one end to pass under said second pulley in contact therewith, said cable then being looped under tension at least once around said first pulley located above said second pulley, said cable then passing under said second pulley in contact with the opposite face of said second pulley to be secured to said second end of said arcuate section in order to maintain said cable in a substantially peripheral contact with said circular arcuate section, said second pulley transferring rotary motion of said first pulley into motion of said side member or offset member to movement of said barrier member to regulate flow of water through said control gate.