Railroad Switch Safety Device for Splitting Detection
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Solution Overview
Problem
Existing safety devices for railroad switches fail to detect splitting events accurately, leading to potential damage and compromised safety conditions, as they either require breaking of load limiting devices or cause unintended damage to other components.
Innovation Solution
A safety device comprising a guide body, control tie-rods, an engagement group, and a detection group that monitors the synchronized translation of control tie-rods, triggering an alarm when unsynchronized translation occurs, indicating a malfunction such as switch splitting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a load limiting device is used to detect switch splitting, then the system can detect breaking events, but the device itself breaks and causes damage to other components
Solution Approach 1:
The patent introduces a control tie-rod as an intermediary element that transmits the mechanical state of the switch points to the detection group without requiring breaking. The control tie-rod engages with the switch points and transmits their positions to the detection group, allowing detection of splitting events without the detection device itself needing to break or cause damage to other components.
Solution Approach 2:
The patent replaces the mechanical breaking-based detection system with a position-based detection system. Instead of relying on the breaking of a load limiting device to detect splitting, the system uses the detection group to monitor the positions of control tie-rods and determine splitting based on positional information, eliminating the need for mechanical breaking.
2Reliability
If the safety device requires breaking of load limiting devices to detect splitting, then detection is possible, but system complexity increases and maintenance becomes difficult
Solution Approach 1:
The patent replaces the mechanical breaking-based detection system with a position-based detection system. Instead of relying on the breaking of a load limiting device to detect splitting, the system uses the detection group to monitor the positions of control tie-rods and determine splitting based on positional information, eliminating the need for mechanical breaking and reducing maintenance complexity.
Solution Approach 2:
The control tie-rods serve dual purposes: they control the switch points during normal operation and simultaneously serve as the detection mechanism for splitting events. The detection group simply monitors the positions of these existing components, eliminating the need for separate breaking-based detection devices and simplifying maintenance.
3Measurement precision
If engagement group allows free translation of control tie-rods, then detection accuracy improves, but system stability decreases
Solution Approach 1:
The engagement group dynamically adjusts its state based on the operational phase. During normal operation, the engagement group maintains control tie-rods in an engaged state for stability. During detection phases, it allows free translation for accurate position monitoring. This dynamic switching enables both stability and detection accuracy.
Solution Approach 2:
The system segments the operational states into distinct phases: normal operation phase where control is maintained, and detection phase where free translation is allowed. The engagement group transitions between these segmented states, enabling the system to achieve both stability during operation and detection accuracy when needed.
Data Source
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AI summary
Safety device (100) for railroad switches (300) comprising a plurality of switch machines (1) configured to displace in a first displacement direction, or in a second displacement direction opposite to the first one, a first and a second switch point (101,102) between two limit positions. The safety device (100) provides a guide body (30) configured to be positioned at a railroad switch (300), a first and a second control tie-rod (41,42) slidingly mounted on the guide body (30) and having respective first ends (41a,42a) and second ends (41b,42b) opposite to the first ends, and, respectively, engaged to the first and to the second switch point (101,102). The first and the second control tie-rod (41,42) are, therefore, caused to translate by the switch points (101,102) between two respective limit positions when the switch machines displace the switch points (101,102) between the limit positions. An engagement group (60) is furthermore provided configured to move from an engagement configuration, in which is arranged to engage the first and the second control tie-rod (41,42) in such a way to form a sliding unit, to a disengagement configuration, in which the control tie-rods (41,42) are free to translate one with respect to the other