Control Head Replacement With Position Feedback for Valve Alignment
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Solution Overview
Problem
Existing control head replacement methods in process valves often result in incomplete teaching of operating positions, leading to potential production downtimes and reduced process reliability due to manufacturing tolerances and statistical fluctuations, especially in critical industries like food and pharmaceuticals, where tight tolerances are required for process valve position feedback.
Innovation Solution
A method involving a replacement control head that receives configuration data from the exchanged control head, senses the target position using a position sensing system, and provides a state indicator to ensure accurate alignment and teaching of operating positions, utilizing a communication unit to adapt to the specific process valve setup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual or automatic teach functions are used to fully teach the replacement control head all operating positions, then the conformity between the piston rod and the replacement control head is improved, but the production downtime increases and the process valve cannot be activated during replacement
Solution Approach 1:
The patent applies preliminary action by performing the teaching of operating positions in advance during the manufacturing process. The control head is pre-taught with all operating position data before installation, so that when replacement is needed, no additional teaching time is required during production. This resolves the contradiction by preparing the control head beforehand, eliminating downtime while ensuring precision.
Solution Approach 2:
The patent uses copying by transferring the operating position data from the original control head to the replacement control head through data communication. Instead of re-teaching all positions manually, the system copies the configuration data, maintaining conformity while reducing the time required for replacement to minimal data transfer time.
2Loss of time
If only a single position is taught during replacement to reduce downtime, then the production downtime is reduced, but the control head is not fully taught all operating positions leading to potential production downtimes later
Solution Approach 1:
The patent applies preliminary action by completing the full teaching of all operating positions before the control head is installed in the system. This ensures that when the control head is replaced, it is already fully configured and ready for immediate use, eliminating both initial downtime and the risk of later downtime due to incomplete teaching.
Solution Approach 2:
The patent implements feedback by providing clear indication when the teaching process is incomplete or when teaching is required. This feedback mechanism ensures that operators are aware of the teaching status, preventing situations where incomplete teaching could lead to reliability issues while maintaining fast replacement when full teaching is already complete.
3Manufacturing precision
If tight manufacturing tolerances and characteristic curve correction are applied during production, then the manufacturing precision is improved, but statistical characteristic curve fluctuations still occur requiring post-production teaching
Solution Approach 1:
The patent applies preliminary action by performing the teaching process during the manufacturing phase before the control head leaves the production line. This preliminary teaching compensates for statistical fluctuations in characteristic curves, ensuring each control head is individually calibrated to its specific characteristics before installation, thereby reducing the need for complex post-installation adjustments.
Data Source
AI summary
A method for an operation-safe replacement of a control head is provided. The control head is configured to actuate a movement of a target and defines at least a first operating position according to which the target is arranged prior to exchanging the control head for a replacement control head. After exchange, the replacement control head receives configuration data and parameters of the exchanged control head. The replacement control head defines at least a second operating position. The second operating position of the replacement control head generally corresponds to the first operating position defined by the exchanged control head. A position sensing system is provided to sense a position of the target after the exchange procedure. An indicator unit is used to provide a state indicator, wherein the state indicator at least depends on a difference between the position of the target and the second operating position defined by the replacement control head.