Integrated LOTO Device for Wind Turbine Rotor Lockout
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing lockout devices for Low Speed Rotor Locks (LSRLs) in wind turbines are not always available or effective, posing safety hazards and compliance issues with governmental regulations such as OSHA standards.
Innovation Solution
A manually operated lock-out tag-out (LOTO) device that securely locks the LSRL into position, bypasses the safety chain switch, and provides a personal locking mechanism to prevent unauthorized operation, ensuring safety and compliance during maintenance and repairs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple separate lockout components (wood, all thread, zip ties) are used to secure the LSRL, then the rotor can be prevented from spinning, but the system becomes complex and vulnerable to unintentional operation
Solution Approach 1:
The patent combines multiple separate lockout components (handle, rod, locking pin, bypass tool) into a single integrated LOTO device. The handle engages the front plate, the rod passes through the handle and pipe, the locking pin secures the rod to the handle, and the bypass tool deactivates the safety chain switch - all as one unified mechanism that prevents rotor rotation while eliminating the need for multiple separate components.
Solution Approach 2:
The LOTO device performs multiple functions simultaneously: the handle engages and secures the LSRL plunger, the rod maintains plunger engagement, the locking pin prevents unauthorized removal, and the bypass tool deactivates the safety chain switch. This multi-functional design replaces several separate tools and components with a single universal device.
2Stability of the object's composition
If traditional lockout methods (wood, all thread) are used to prevent LSRL vibration and backing out, then some stability is achieved, but these methods do not provide personal protection and can be easily removed
Solution Approach 1:
The locking pin acts as an intermediary component that physically connects the handle and rod assembly to the LSRL mechanism. The pin includes holes configured to receive personal locks, creating a mediator between the mechanical lockout components and the worker's personal safety requirements. This intermediary structure provides both stability and personal protection.
3Ease of operation
If the safety chain sensor is manipulated with zip ties to allow work, then access is gained, but the system remains vulnerable to unintentional operation and does not meet OSHA regulations
Solution Approach 1:
The bypass tool is designed to deactivate the safety chain switch as a preliminary action before maintenance work begins. The tool engages with the limit switch lever to switch the safety chain to an inactive state, allowing the LSRL to be engaged and the rotor locked out. This preliminary deactivation of the safety sensor is an intentional, controlled action that enables subsequent lockout procedures while maintaining compliance.
Data Source
AI summary
A lock-out tag-out (LOTO) device comprising a handle including at least first and second holes; a pipe configured to maintain an object to be locked in a locked condition; a rod configured to be received within the first hole of the handle and be received within the pipe, the rod including a hole; a locking pin configured to be received within both the second hole of the handle and the hole of the rod to secure the rod in position relative to the handle, the locking pin including one or more holes configured to receive one or more separate LOTO locks.