Trunnion Roller Thrust Sensing for Precise Rotary Drum Alignment
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Solution Overview
Problem
Current methods for measuring and adjusting the skew of trunnion roller assemblies in rotary drums are unsafe, imprecise, and prone to human error, leading to premature bearing wear and equipment damage due to improper alignment.
Innovation Solution
A trunnion roller thrust measurement system that includes sensors on the bearing housing end cap to measure thrust forces and a processor to determine if adjustments are needed, with an adjustment mechanism to skew the rollers based on sensed forces, ensuring proper alignment and reducing wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual measurement methods (hammer test) are used to measure thrust force, then the measurement process is simple, but the measurement precision is poor and human error increases
Solution Approach 1:
The patent replaces manual mechanical measurement methods (hammer test) with electronic sensors (strain gauges, load cells, or pressure sensors) to automatically measure thrust force. This substitution provides precise quantitative data while eliminating human error and subjective judgment, directly resolving the contradiction between measurement precision and device complexity.
Solution Approach 2:
The patent introduces sensors as intermediary devices between the thrust force source and the measurement system. These sensors convert mechanical thrust force into electrical signals that can be processed by the control system, enabling accurate measurement without direct human intervention and resolving the precision-accuracy tradeoff.
2Reliability
If trunnion rollers are skewed to bear downward thrust, then the bearing wear is reduced, but the alignment precision becomes difficult to maintain
Solution Approach 1:
The patent implements a feedback control system where sensors continuously monitor thrust force on bearing housing end caps, and the control system automatically adjusts trunnion roller skew angle based on this feedback. This closed-loop system maintains optimal alignment precision while ensuring reliable thrust bearing distribution, resolving the contradiction between reliability and manufacturing precision.
Solution Approach 2:
The patent makes the trunnion roller skew angle dynamic and adjustable rather than fixed. The skew angle can be automatically adjusted during operation based on measured thrust forces, allowing the system to adapt to changing conditions and maintain both reliability and precision simultaneously.
3Manufacturing precision
If frequent manual adjustments are made to trunnion roller skew, then the alignment accuracy is maintained, but the operational safety decreases due to personnel exposure to rotating equipment
Solution Approach 1:
The patent implements a self-adjusting system where the trunnion roller alignment is automatically maintained through sensor feedback and automated adjustment mechanisms. This eliminates the need for manual intervention near rotating equipment, maintaining alignment accuracy while removing personnel from hazardous environments, thus resolving the safety-precision contradiction.
Solution Approach 2:
The patent replaces manual adjustment operations with automated mechanical or actuated adjustment systems controlled by the measurement system. This substitution maintains alignment precision while eliminating the safety hazards associated with personnel working near rotating drum and riding ring interfaces.
4Strength
If thrust bearing capacity is increased to handle full downhill thrust, then the bearing housing end cap strength is improved, but the device complexity and cost increase
Solution Approach 1:
The patent makes the thrust bearing load dynamic and adjustable through trunnion roller skewing. By distributing thrust between uphill and downhill bearings through angular adjustment, the system avoids the need for oversized bearings capable of handling full downhill thrust, thus reducing complexity while maintaining adequate strength through intelligent load management.
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 accurate and safe measurement of thrust forces, allowing for precise adjustment of trunnion roller assemblies, thereby reducing the risk of equipment damage and extending the lifespan of rotary drum components.
Implementation Method 1
The thrust sensor may be any suitable sensor configured to sense a thrust force, including, but not limited to, a strain gauge or other linear variable differential transformer (LVDT).
Data Source
AI summary
A trunnion roller thrust measurement assembly includes a trunnion roller assembly and a thrust measurement assembly. The trunnion roller assembly includes a roller configured to provide rotary support of a rotary drum; a shaft attached to the roller, the shaft being aligned with an axis of rotation of the roller; and a bearing housing configured support an end of the shaft. The thrust measurement assembly includes a bearing housing end cap attachable to an end of the bearing housing; and one or more thrust sensors disposed on the bearing housing end cap. The one or more thrust sensors are configured to sense a thrust force exerted on the bearing housing end cap by an axial displacement of the shaft. An adjustment mechanism is utilized to skew the roller based on the sensed thrust force.