Multi-Channel Safety Switch Assembly for Fault Diagnosis
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Solution Overview
Problem
Existing safety switch systems are prone to failures due to single-channel structures, which can lead to malfunctions and lack integration of diagnostics and efficient transfer of mechanical and electrical/electronic functions, making them susceptible to environmental influences and manipulations.
Innovation Solution
A safety switch assembly with a multi-channel transmission installation that synchronously drives multiple transmission members to convert actuator movements into translatory movements of switching members, enhancing fail-safe reliability and allowing for diagnostics and seamless function transfer across the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-channel locking mechanism is used, then the device complexity is reduced, but the reliability deteriorates due to rapid malfunction and loss of functionality
Solution Approach 1:
The locking mechanism is divided into multiple independent channels (first channel with first switching member, second channel with second switching member). Each channel operates independently, so a fault in one channel does not affect the other, thereby improving reliability while maintaining reasonable complexity through modular segmentation.
Solution Approach 2:
Different channels can have different functional characteristics and switching members suited to their specific requirements. The first and second switching members can be of different types or configurations, allowing each local component to be optimized for its specific function while contributing to overall system reliability.
2Reliability
If electronic locking mechanisms are used, then the reliability is improved through fault diagnosis capability, but the device complexity increases due to required wiring and sensitivity to environmental influences
Solution Approach 1:
A transmission installation acts as an intermediary between the actuation installation and switching installations. This mechanical transmission system enables reliable force and motion transfer without requiring complex electrical wiring between components, thereby maintaining reliability while reducing wiring complexity and environmental sensitivity.
Solution Approach 2:
The patent uses mechanical transmission elements (transmission members, gearwheels, pulleys) to replace electrical wiring for transferring control signals and forces. This substitution eliminates the need for sensitive electrical connections while maintaining the ability to transmit actuation commands reliably across the system.
3Object-affected harmful factors
If mechanical locking systems without wiring are used, then the sensitivity to environmental influences is reduced, but the adaptability deteriorates due to inability to integrate command functions and HMI interfaces
Solution Approach 1:
The switching members are designed to serve multiple functions: they act as both mechanical switching elements for the locking mechanism and as interfaces for command functions and HMI operations. This multi-functionality allows the mechanical system to maintain environmental robustness while gaining the adaptability needed for integrated control and user interaction.
Solution Approach 2:
The actuation installation and switching installations are merged into a unified system where mechanical actuation and electrical/electronic control functions are combined. The transmission installation facilitates this merging by enabling both mechanical force transfer and signal transmission, allowing command buttons and HMI interfaces to be integrated without compromising environmental resistance.
4Adaptability or versatility
If modules are combined with electronic systems, then the adaptability is improved through command function integration, but the reliability deteriorates due to faulty sealing and water ingress leading to short circuits
Solution Approach 1:
The transmission installation serves as a protective intermediary between electronic command functions and the external environment. By providing sealed mechanical transmission paths through transmission members, it allows electronic modules to be integrated while protecting them from water ingress and environmental damage that would cause short circuits.
Solution Approach 2:
The system employs sealed housings and protective barriers (transmission members acting as mechanical barriers) that provide flexible yet protective enclosures for electronic components. These sealed structures maintain adaptability for command function integration while preventing water ingress and maintaining sealing reliability in harsh environments.
Data Source
AI summary
The invention relates to a safety switch assembly (100) having a switch installation (120) having at least one switching member (12) and at least one actuation installation (110) having at least one assigned actuator (13, 13′, 13″, 14), wherein a transmission installation (130) having at least one transmission member (135) which is coupleable or coupled to the switching member (12, 12a), on the one hand, and to the at least one actuator (13, 13′, 13″, 14), on the other hand is provided between the actuation installation (110) and the switch installation (120). In order to have available a safety switch assembly (100) in which a mechanical fault does not lead to a failure of that functionality that optionally permits the integration of a diagnostic function in order for the system in the case of a fault being detected to be able to be brought back to a safe state and that permits a transfer of mechanical as well as of electrical/electronic functions across the entire system, it is provided that the transmission installation (120) is provided with a plurality of separate transmission members (135) which in the actuation of the at least one actuator (13, 13′, 13″, 14) of the actuation installation (110) are drivable or driven in a synchronous and mutually independent manner, and that each of the transmission members (135) by way of a rotary movement is permitted to convert an actuation movement of the at least one actuator (13, 13′, 13″, 14) to a translatory movement of in each case one separate switching member (12, 12a) of the switch installation (120). (FIG. 4).