Variable Gate Control Using Proximity Sensors for Grain Elevators
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Solution Overview
Problem
Existing gate control systems in grain elevators are complex, expensive, and lack reliability, particularly in explosive environments, and are sensitive to electrical noise and temperature variations, leading to processing delays and dockage penalties.
Innovation Solution
A digital gate control system using proximity sensors and pulse trains to determine gate position, which is less prone to errors, explosion-proof, and adaptable to any gate size, allowing for remote operation and easy maintenance, utilizing common industrial components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If analog control systems are used for gate position detection, then the system can control gate position, but the system becomes sensitive to electrical noise and temperature variations
Solution Approach 1:
The patent replaces analog control systems with a digital control system that uses proximity sensors to generate pulse train signals. This substitution of mechanical/analog detection with digital signal processing eliminates sensitivity to electrical noise and temperature variations, as digital signals are inherently more stable and resistant to environmental interference.
Solution Approach 2:
The patent changes the parameter representation from continuous analog signals to discrete digital pulse train signals. By converting gate position detection into digital counts of pulse trains, the system achieves immunity to electrical noise and temperature effects while maintaining precise position control capability.
2Ease of operation
If complex electronic drive packages are used for variable opening gates, then gate control functionality is achieved, but the system becomes complicated and expensive
Solution Approach 1:
The patent extracts and eliminates unnecessary complex electronic drive packages by implementing a simpler control architecture. The system uses basic proximity sensors and digital signal processing rather than complex analog drive mechanisms, reducing both system complexity and cost while maintaining full gate control functionality.
Solution Approach 2:
The patent employs inexpensive proximity sensors and standard digital components instead of expensive specialized drive packages. By using common industrial components that are readily available and cost-effective, the system achieves the required gate control functionality without the high cost and complexity of proprietary electronic drive systems.
3Ease of operation
If state of the art analog control systems are used, then gate position can be controlled, but the systems lack reliability in explosive environments
Solution Approach 1:
The patent replaces analog control systems with digital control that uses proximity sensors to detect gate position through non-contact means. This eliminates the need for complex electronic drive packages and reduces the risk of sparks or electrical failures in explosive grain dust environments, thereby improving reliability while maintaining remote control capability.
4Measurement precision
If analog potentiometers are used for gate position sensing, then gate position detection is achieved, but the system requires proper sizing for different gate sizes
Solution Approach 1:
The patent creates a universal gate position detection system using proximity sensors that count pulse trains. This digital counting method is scalable and can be applied to gates of any size by simply adjusting the number of pulses required to traverse the gate stroke, eliminating the need for different potentiometer sizes for different gate dimensions.
Solution Approach 2:
The patent changes from fixed-size analog potentiometers to a scalable digital pulse counting system. The number of pulse counts can be adjusted to match any gate size, providing a universal solution that maintains measurement precision across different gate dimensions without requiring hardware reconfiguration.
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 provides reliable and efficient control of grain flow, reduces processing delays, and minimizes the risk of dockage penalties by being less sensitive to noise and temperature variations, while being cost-effective and modular for easy maintenance and retrofitting.
Implementation Method 1
One sensor can be positioned to sense the proximity (i.e., presence/no presence) of the teeth of a metal sprocket directly tied to the mechanical drive system
Implementation Method 2
The other sensor positioned to sense the fully closed position or the fully open position of the gate utilizing detection of the presence of lack of presence of metal directly associated with movement of the gate
Data Source
AI summary
A variable gate with control for grain elevator applications utilizes a sliding gate panel. Two proximity sensors are arranged to provide full sensing and control functions of the gate remotely located. A first proximity sensor confirms gate is shut, and a second proximity sensor outputs a serial pulse train signal for detecting movement of the gate panel. The second proximity sensor can be operatively coupled with gear teeth inherent to the drive mechanism (e.g., rack and pinion mechanism), or with a passive device such as a free sprocket on the motor shaft to sense the passage of each sprocket teeth, or may be placed at a linear portion that moves with the gate that has sequential indicating positions, such as metal or no metal positions. In one embodiment, the controller tracks the direction of the gate as pulses are receive, allowing the subsequent positioning of the gate.