Safety Switch Response Range Control for Reliable Guard Locking
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Solution Overview
Problem
Existing safety devices face reliability issues due to mechanical disturbances causing false signals when the actuator is not fully locked, leading to incorrect reporting of the closed position and potential system shutdowns.
Innovation Solution
The response range of the reading unit is made variable, being smaller when the guard locking is not effected and larger when it is, ensuring accurate detection of the closed position only when the locking element can be safely inserted, thus preventing false lock activations and maintaining system reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the response range of the reading unit is chosen sufficiently large to ensure transponder signal recognition under vibrations, then the reliability of closed position detection is improved, but false recognition of closed position before locking occurs increases
Solution Approach 1:
The response range of the reading unit is made dynamically adjustable between a first size (when locking is not effected) and a second larger size (when locking is effected). This dynamic adaptation allows the system to expand the detection range only when mechanically locked, preventing false positives during approach while ensuring robust detection when secured.
Solution Approach 2:
The system changes the parameter of response range size based on the locking state. When the locking element is inserted into the receptacle, the response range is increased to accommodate vibrations and disturbances. When not locked, the response range is reduced to prevent premature detection, thereby resolving the contradiction between reliability and precision.
2Measurement precision
If the response range is reduced to prevent false recognition before locking, then measurement precision is improved, but detection reliability under vibrations deteriorates
Solution Approach 1:
The response range dynamically adapts to the locking state, being small during approach (precision maintained) and large during locked state (reliability ensured). This temporal separation of range sizes resolves the contradiction by applying the appropriate range size at the appropriate operational phase.
Solution Approach 2:
The system preliminarily sets the response range to a smaller size before locking occurs, ensuring precision during approach. Only after the locking element is inserted does the system switch to the larger response range, preparing the detection parameters in advance for the expected operational state.
3Reliability
If the response range is large to accommodate actuator movement under vibrations, then the reliability of signal recognition is improved, but false lock activations increase
Solution Approach 1:
The response range size is locally adapted to the operational context: small when the actuator is approaching (preventing false locks) and large when locked (accommodating vibrations). This localized parameter adjustment eliminates false lock activations while maintaining reliable signal recognition under vibrations.
Solution Approach 2:
The response range transitions from a static parameter to a dynamic one that changes with the locking state. This dynamic behavior prevents false lock activations during approach by using a smaller range, while enabling reliable vibration tolerance during the locked state with a larger range.
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
This approach enhances the functional reliability of the safety device by ensuring accurate detection of the closed position and preventing incorrect shutdowns, even under vibrations or other mechanical disturbances.
Implementation Method 1
the safety device has a safety switch (2) and an actuator (3) arranged to be movable relative to the safety switch (2). The safety switch (2) has a reading unit (4) and includes an actuator (3), which has a transponder (5)
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a safety device (1) with a safety switch (2) which has a reading unit (4) and a locking element (6) and includes an actuator (3) which has a transponder (5) and a receptacle (7). In a closed position of the actuator (3), which is checked by means of the reading unit (4) and the transponder (5), the locking element (6) can be inserted into the receptacle (7), whereby locking is effected. Signals from the transponder (5) are only detected by the reading unit (4) within a response range (11). Furthermore, adjustment means are provided, by means of which the size of the response area (11) is specified depending on whether the tumbler is activated or not.