Dual-Locking Actuator Safety Module for Overload Fault Tolerance
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Solution Overview
Problem
Existing safety devices in machine safety technology can malfunction due to mechanical overload, allowing access to danger areas despite safety switches, leading to potential hazards.
Innovation Solution
A safety device with a dual-locking mechanism, combining a locking device and a security system, where the security system locks the actuator in its closed position even if the locking device malfunctions, ensuring continued safety through a redundant mechanical structure and detection means to prevent uncontrolled access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking device is used to lock the actuator in its closed position, then the safety function is improved, but the risk of malfunction due to mechanical overload increases
Solution Approach 1:
The locking function is segmented into two independent systems: a locking device and a safety system. Each system has its own locking element (locking element and safety element) that can independently lock the actuator. This segmentation ensures that if one system fails due to mechanical overload, the other system remains functional and can maintain the locked state.
Solution Approach 2:
The locking device and safety system are designed with different local qualities to handle mechanical overload differently. The locking device is designed to bear the primary mechanical load, while the safety system is designed as a backup with different structural characteristics. This allows the locking device to handle normal operational loads while the safety system provides protection against extreme overload conditions.
2Reliability
If a redundant safety system is added to lock the actuator, then the fault tolerance is improved, but the device complexity increases
Solution Approach 1:
The locking device and safety system are merged into a single integrated locking mechanism that shares common components such as the actuator, mounting structure, and control system. This merging approach allows the redundant safety function to be added while minimizing the increase in overall device complexity by utilizing existing structural elements.
Solution Approach 2:
The actuator serves multiple functions: it activates both the locking device and the safety system, and it can be locked by either system independently. This multi-functionality reduces the need for separate control mechanisms and simplifies the overall system architecture while maintaining the redundant safety function.
Data Source
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AI summary
The invention relates to a safety device (1) comprising a safety module and an actuator (8) movable relative to the module, wherein the actuator (8) can be brought into a closed position in or on the safety module. Furthermore, a locking device is provided by means of which the actuator (8) can be locked in its closed position. A safety system is provided by means of which the actuator (8) can be additionally locked in its closed position. The safety system is designed to lock the actuator (8) in its closed position if the locking function of the locking device is disabled due to a malfunction.