Multi-Direction Locking Sensor With RFID and Bolt Validation
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Solution Overview
Problem
Industrial safety locking switches face challenges in accommodating multiple directions of approach for locking tongues without requiring rotation of the head or switch, leading to installation complexities and potential safety hazards due to the need for mechanical reconfiguration.
Innovation Solution
A locking switch design with three entry slots on adjacent sides of its housing, incorporating tilted RFID coils and an inductive coil to detect an RFID tag and locking bolt from various directions, allowing for flexible installation without rotating the switch, and validation circuitry to confirm bolt detection without interrupting normal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a locking switch has a single entry slot requiring rotation to accommodate different directions of approach, then the locking mechanism is simple, but installation complexity increases and safety hazards arise due to mechanical reconfiguration needs
Solution Approach 1:
The locking switch is segmented into multiple independent entry slots (at least three) positioned on different sides of the housing, each capable of receiving a locking tongue independently. This segmentation allows the switch to accommodate multiple directions of approach simultaneously without requiring rotation or mechanical reconfiguration, directly resolving the technical contradiction by providing adaptability while maintaining installation simplicity.
Solution Approach 2:
The locking switch is designed with universal functionality to accept locking tongues from multiple directions through separate entry slots. Each entry slot serves the same function (receiving and detecting locking tongue insertion) but in different spatial orientations, enabling the single device to fulfill multiple directional requirements without modification or reconfiguration.
2Measurement precision
If RFID coils are added to detect locking tongue insertion, then detection capability is improved, but device complexity increases
Solution Approach 1:
The RFID detection system is merged with the locking switch housing, integrating the sensing functionality into the existing structure. The RFID coils are positioned within the housing to detect locking tongue insertion at the entry slots, combining the mechanical locking function with electronic detection in a unified device, thereby improving detection capability while minimizing additional complexity.
Solution Approach 2:
The RFID coils serve as an intermediary detection mechanism between the mechanical locking tongue and the control system. The coils detect the presence or position of the locking tongue through electromagnetic fields without requiring direct mechanical contact or complex mechanical sensors, improving detection precision while maintaining relatively simple device architecture.
3Measurement precision
If an inductive coil is used to detect locking bolt advancement, then bolt position detection is improved, but energy consumption increases
Solution Approach 1:
The mechanical detection system for locking bolt advancement is replaced with an inductive coil-based electromagnetic detection system. The inductive coil detects bolt position through changes in electromagnetic field caused by the bolt's movement, eliminating the need for complex mechanical switches or contacts, thereby improving detection accuracy while reducing energy consumption compared to continuously powered mechanical systems.
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
Enables reliable detection of locking tongue insertion from multiple directions, reduces installation complexity, and ensures safe operation by validating bolt position without actuating the locking bolt, thus enhancing installation flexibility and safety.
Implementation Method 1
an inductive coil that generates a second sensing field about a second sensing field axis at a second frequency and that detects advancement of the locking bolt
Implementation Method 2
at least two RFID coils that generate a first sensing field at a first frequency that detects an RFID tag
Data Source
AI summary
For locking industrial safety guarding, a sensor includes an inductive coil that generates a second sensing field about a second sensing field axis at a second frequency that detects advancement of a locking bolt. The sensor further includes at least two radio frequency identifier (RFID) coils that generate a first sensing field at a first frequency that detects an RFID tag. A second RFID coil of the at least two RFID coils has a second polarity reversed from a first polarity a first RFID coil of the at least two RFID coils and reduces the first sensing field at the second sensing field axis.