Railroad Switch Point Blade Hydraulics for Obstacle Detection
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Solution Overview
Problem
Existing apparatuses for moving railroad switch point blades lack safety features to prevent obstacles from interfering with the displacement of point blades, leading to potential derailments, especially in high-speed rail systems, and fail to accurately detect such obstructions.
Innovation Solution
An apparatus with a hydraulic actuator system featuring flow and pressure measurement devices, servo valves, and processing units to adjust fluid flow and pressure dynamically, ensuring accurate and safe movement of point blades by detecting and responding to obstacles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional hydraulic actuators are used to move point blades, then the switching operation can be performed, but the system cannot detect obstacles between the point blade and rail stock, leading to safety issues
Solution Approach 1:
The patent implements feedback by continuously monitoring hydraulic flow and pressure through measurement devices connected to the actuator chambers. The control unit compares actual flow/pressure values against expected values during switching operations, and when deviations exceed thresholds, it detects potential obstacles and prevents unsafe positioning. This feedback mechanism enables obstacle detection without requiring additional mechanical sensors at the blade-rail interface.
Solution Approach 2:
The patent replaces traditional mechanical obstacle detection methods (such as mechanical sensors or switches at the blade-rail interface) with a hydraulic-based detection system. By monitoring flow and pressure parameters in the hydraulic circuit, the system infers the presence of obstacles indirectly, substituting mechanical detection with fluid-based sensing that integrates into the existing hydraulic actuation infrastructure.
2Reliability
If flow and pressure measurement devices are added to detect obstacles, then safety is improved, but the device complexity increases
Solution Approach 1:
The patent makes the hydraulic flow and pressure measurement devices serve multiple functions: they simultaneously control the actuation of point blades during normal switching operations and detect obstacles by monitoring deviations in flow and pressure patterns. This multi-functionality allows the same measurement infrastructure to support both operational control and safety detection, reducing the need for separate dedicated obstacle detection hardware.
Solution Approach 2:
The system uses its own hydraulic actuation system's inherent flow and pressure characteristics for self-diagnosis of obstacle conditions. Rather than requiring external detection equipment, the system monitors its own operational parameters during switching, and the control unit analyzes these self-generated signals to detect anomalies indicating obstacles, enabling the system to self-monitor its safety status.
3Manufacturing precision
If the actuator stroke is increased to ensure complete blade closure, then positioning accuracy is improved, but the risk of over-stroke damage and obstacle-induced bending increases
Solution Approach 1:
The patent implements dynamic control of the actuator stroke by continuously monitoring flow and pressure parameters during the switching operation. Rather than using a fixed predetermined stroke, the control unit adjusts the actuation in real-time based on hydraulic parameter feedback, enabling the system to achieve complete blade closure when needed while preventing over-stroke conditions that could cause damage or indicate obstacle presence.
Solution Approach 2:
The system performs preliminary detection of obstacle conditions by monitoring flow and pressure trends before complete blade closure is achieved. By detecting deviations in hydraulic parameters that precede potential over-stroke or obstacle contact, the control unit can preemptively adjust or stop the actuation, preventing the harmful effects of over-stroke damage or blade bending before they occur.
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
Ensures high safety and accuracy in point blade movement by promptly detecting and addressing obstacles, preventing derailments and simplifying installation, while enhancing control and communication of system anomalies.
Implementation Method 1
said displacement group being caused to translate along said displacement direction in said first, or second, displacement direction, according to the pressure applied by a working fluid in said first, or second, push chamber
Implementation Method 2
a first flow measurement device configured to constantly detect flow data in said first control branch, and a second flow measurement device configured to constantly detect flow data in said second control branch
Implementation Method 3
a first pressure measurement device configured to constantly detect pressure data in said first control branch, and a second pressure measurement device configured to constantly detect pressure data in said second control branch
Implementation Method 4
said, or each, servo valve being configured to adjust said flow and said pressure of said working fluid in said respective peripheral feeding circuit
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
Apparatus (1) for moving the point blades of a railroad switch (500) comprising at least a hydraulic actuator (71) and a displacement group (20) in such a way to, alternately, move at least a point blade (101,102) between two limit positions in which the point blade is, respectively, closed to, or spaced from, a respective rail stock (111,112). It is, furthermore, provided a feeding group (200) comprising a pumping device (205) configured to feed a first predetermined constant flow of the working fluid into a main feeding circuit (210), and at least a second determined flow of the working fluid in a first or a second push chamber (77,78) of the, or each, hydraulic actuator (71) through a respective peripheral feeding circuit (215). This comprises a first and a second control branch (201,202) respectively provided with a first and a second flow measurement device (211,212) and with a first and a second pressure measurement device (221,222) to constantly detect flow and pressure data. The apparatus furthermore comprises at least a servo valve (250) operated by a respective peripheral processing unit (400) to adjust the flow and the pressure of the working fluid in a respective peripheral feeding circuit (215). [Fig. 3]