Magnet Holder Assembly for Low-Play Actuator Position Sensing
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Solution Overview
Problem
Existing actuating valve position detection devices suffer from inaccuracies and delays due to play and/or delay between actuating valve stroke movement and shaft rotation movement, complicating maintenance and reducing responsiveness and precision.
Innovation Solution
A holder for a magnetically sensitive actuating valve position detection device that includes a receptacle for the magnet, a fastening section for secure attachment to the shaft, and a support section for a torsion spring, allowing direct translation of actuating valve stroke movements into rotational movements with minimal delay and play, and enabling easy assembly and disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the magnet is attached directly to the shaft with plastic coating for inseparable connection, then the connection strength is improved, but the ease of repair deteriorates because the magnet, shaft and plastic casing can only be replaced as a unit
Solution Approach 1:
The holder is designed as a separate component that segments the magnet attachment system from the shaft. The holder can be detached from the shaft, allowing the magnet to remain in place while only the holder is replaced during maintenance, thus improving ease of repair while maintaining connection strength through the holder's clamping design
Solution Approach 2:
The holder acts as an intermediary component between the magnet and the shaft. Instead of directly attaching the magnet to the shaft with plastic coating, the holder provides a removable intermediate connection that maintains strength while enabling separate replacement of the holder from the magnet and shaft assembly
2Measurement precision
If the magnet-sensitive sensor is arranged approximately in the middle and above the magnet, then the measurement precision is improved, but the device complexity increases due to additional positioning requirements
Solution Approach 1:
The holder is designed with a support section that serves multiple functions: it holds the magnet securely and simultaneously provides precise positioning for the magnet-sensitive sensor. This multi-functional design achieves accurate sensor positioning without requiring separate complex positioning mechanisms, thus improving measurement precision while limiting device complexity
3Ease of operation
If play and delay are present between actuating valve stroke movement and shaft rotation movement, then the ease of operation is improved with tolerance for misalignment, but the measurement precision deteriorates due to detrimental effect on responsiveness and accuracy
Solution Approach 1:
The holder includes a support section that preliminarily positions and guides the shaft before rotation occurs. This preliminary guidance action reduces play and misalignment during operation, improving measurement precision and responsiveness while maintaining ease of operation through the holder's integrated positioning function
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 solution provides significantly more precise and delay-free detection of actuating valve positions, simplifies the assembly and disassembly process, and enhances the functionality of the actuating valve position detection device by supporting the torsion spring and guiding it effectively.
Implementation Method 1
A magnet (35), in particular a permanent magnet, is accommodated in the holder (1)
Implementation Method 2
A torsion spring (89) is supported on the one hand on the housing (5) and on the other hand on the holder (1)
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The present invention relates to a holder for a magnet of a magnetically sensitive actuator position sensing device of an actuator of a process plant, such as a chemical plant, a food processing plant, a power plant or the like, wherein the actuator position sensing device has a shaft rotatably mounted in a housing of the actuator position sensing device, which defines an axis of rotation oriented parallel to a torsion spring supported on the housing, and a lever arm connected to the shaft in a rotationally fixed manner, which is coupled to the actuator in such a way that an actuator stroke movement can be transmitted by the lever arm into a shaft rotation movement, comprising a receptacle for holding the magnet, in particular by clamping, a fastening section connected to the receptacle for rotationally fixed fastening of the holder to the shaft,and a support section connected to the mount and the fastening section for the purpose of supporting the torsion spring, in particular by interlocking, in order to build up a torsion spring force during a shaft rotation movement.