Safety Switch Module with Proximity Detection for Actuator Position
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Solution Overview
Problem
Existing safety switches do not meet the requirements of higher safety categories, particularly in recognizing the status of protective devices despite damage, such as actuator breakage, to ensure safe machine shutdown.
Innovation Solution
A module for a safety switch that includes a base body fixed to the safety switch with a receiving opening for a proximity switch, allowing detection of the actuator's position through mechanical coding and electromagnetic interaction, providing dual independent detection methods to ensure accurate status recognition and safe shutdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single detection method is used in existing safety switches, then the device complexity is low, but the reliability is insufficient for higher safety categories
Solution Approach 1:
The detection system is segmented into two independent detection channels: a first detection means (mechanical coding recognition) and a second detection means (proximity detection). Each channel independently monitors the actuator position, and both must agree for the safety switch to indicate the protective device is closed. This segmentation provides redundancy and increases reliability without requiring a completely complex integrated system.
Solution Approach 2:
A module is introduced as an intermediary component that houses the proximity switch and provides the second independent detection channel. This module can be retrofitted onto existing safety switches, adding the necessary redundancy for higher safety categories without redesigning the entire safety switch system. The module serves as a mediator between the actuator and the safety switch's control logic.
2Measurement precision
If the actuator is mechanically coded for precise detection, then the measurement precision is high, but the vulnerability to damage (breakage) increases
Solution Approach 1:
The system prepares for potential actuator breakage by implementing a second detection means that monitors the actuator's position independently of the mechanical coding. The proximity switch detects the actuator's position based on its physical position rather than its mechanical coding, providing a backup detection method that remains functional even if the mechanical coding is damaged or the actuator is partially broken.
Solution Approach 2:
The system changes the detection parameter from solely mechanical coding recognition to include both mechanical coding recognition and proximity-based position detection. By using two different detection parameters (mechanical features and physical position), the system ensures that if one parameter becomes unavailable due to actuator damage, the other parameter can still provide accurate status information.
3Reliability
If dual independent detection methods are implemented, then the reliability for higher safety categories is achieved, but the device complexity increases
Solution Approach 1:
The detection system is segmented into two independent detection channels: a first detection means (mechanical coding recognition) and a second detection means (proximity detection). Each channel independently monitors the actuator position, and both must agree for the safety switch to indicate the protective device is closed. This segmentation provides redundancy and increases reliability without requiring a completely complex integrated system.
Solution Approach 2:
The module designed for the safety switch serves multiple functions: it houses the proximity switch for the second detection channel, provides mounting structure, and integrates with the existing safety switch's electrical and mechanical systems. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while achieving the required dual detection capability.
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 module enhances safety switch performance by enabling detection of the actuator's position in two independent ways, ensuring safe operation even if the actuator is damaged, and can be easily retrofitted into existing safety switches, meeting higher safety standards.
Implementation Method 1
The module has a proximity switch with which a position of the actuator can be detected which corresponds to the state of the first section of the actuator inserted into the head section
Data Source
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AI summary
The invention relates to a module (1) for a safety switch (1) which has a housing (2) having a head section (4) into which a preferably mechanically encoded first section (22) of an operator (20) can be inserted and, as a result, initiates a switching process in an electrical switch unit of the safety switch (1), characterized in that the module (10) can be secured to the safety switch (1) and has a proximity switch (30) with which a position of the operator (20) can be detected, said position corresponding to the state of the first section (22) of the operator (20) in which it is inserted into the head section (4), and in that the module (10) has an interface to the safety switch (1), by means of which interface a signal which represents the detected position of the operator (20) can be transmitted from the module (10) to the electrical switch unit of the safety switch (1), to a safety switch (1) having a module (10) of this kind, and to an operator (20) for a safety switch (1) of this kind.