Tower Control Box Override for Pivot Misalignment Reset
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Solution Overview
Problem
Existing center pivot irrigation systems require technicians to manually identify and correct misaligned towers, which poses risks of injury from climbing, electric shock, and snagging by moving parts.
Innovation Solution
A tower control box with a shaft, lever, run switch, overtravel shutoff switch, misalignment indicator light, and override switch that allows technicians to identify and correct misalignments externally, reducing the need for manual intervention and enhancing safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If technicians manually climb towers to identify and correct misalignment, then they can directly access the misalignment shutoff switch, but they face risks of injury from falling, electric shock, or snagging by moving parts
Solution Approach 1:
The patent introduces an intermediary mechanism (the externally accessible override switch and indicator light system) that allows technicians to identify and correct misalignment without directly climbing the tower. The indicator light serves as a mediator to remotely identify the misaligned tower, and the externally accessible override switch acts as a mediator to correct the misalignment from ground level, eliminating the need for direct manual intervention on the tower structure.
Solution Approach 2:
The patent segments the misalignment correction function into two separate externally accessible components: an indicator light for identification and an override switch for correction. This segmentation allows the identification and correction functions to be performed independently from ground level, rather than requiring unified manual access to the tower's internal switch.
2Productivity
If technicians manually override the misalignment shutoff switch from within the tower control box, then the misalignment can be corrected, but the technician must guess which tower tripped the system and climb multiple towers
Solution Approach 1:
The patent uses color changes (light emission) to indicate the misaligned tower. The indicator light changes from off to on (or changes color) to visually identify which specific tower has tripped the misalignment shutoff switch, eliminating the need for technicians to guess or systematically check each tower.
Solution Approach 2:
The indicator light acts as an intermediary that communicates the misalignment status from the tower's internal sensors to the external environment, allowing remote identification without physical inspection of each tower control box.
3Reliability
If the misalignment shutoff switch cuts power to all towers when misaligned, then safety is ensured, but the system cannot operate until manually overridden
Solution Approach 1:
The system provides self-service capability through the externally accessible override switch that allows operators to reset the misalignment shutoff without requiring specialized maintenance intervention or system shutdown procedures. The automatic resetting feature further enhances self-service by restoring normal operation automatically once misalignment is corrected.
Solution Approach 2:
The externally accessible override switch serves as an intermediary that allows the operator to safely reset the safety shutdown function from ground level, maintaining the safety shutdown capability while enabling quick recovery without prolonged system downtime.
Data Source
AI summary
A tower control box for an intermediate tower of a center pivot irrigation system includes an overtravel shutoff switch configured to be toggled when the intermediate tower is out of alignment with a connected tower of the center pivot irrigation system beyond a misalignment threshold, wherein toggling the overtravel shutoff switch disconnects power to all wheel actuators of the center pivot irrigation system by opening a normally closed sub-switch for connecting the power and closing a normally open sub-switch for diverting the power. The tower control box may further include a misalignment indicator light and/or an externally accessible override switch connected to the overtravel shutoff switch to help identify and/or realign the intermediate tower with other towers of the center pivot irrigation system after the overtravel shutoff switch has been triggered.