Railroad Switch Device Mechanical Target Detection

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Solution Overview

Problem

Existing hydraulic railroad switch devices lack reliable point detection and indication systems, especially without electric power, and pose safety risks during manual operation due to spring force-related accidental movements during installation or maintenance.

Innovation Solution

The hydraulic railroad switch device incorporates a trailable switching unit with a mechanical target, proximity sensors, and a spring unit that uses hydraulic cylinders and cam follower bearings to maintain switch points securely, allowing for reliable detection and hand throw operations without electric power, and includes safety features like a center stroke unit and safety latch to prevent accidental movements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If spring units are used to maintain switch points, then the switch rails can be held securely in position, but accidental movements may occur during manual installation or maintenance due to spring force

Engineering Contradiction:

Improveswitch point stabilityVSAvoidspring force causing accidental movement

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The safety latch mechanism applies a counteracting force to the spring unit before manual operations begin. The latch is engaged in a locked position that physically prevents the switch points from moving, counteracting the spring force beforehand. This preliminary anti-action ensures that even if the spring is under tension, the switch points remain stationary during installation or maintenance, eliminating the harmful effect of accidental movement.

Inventive Principle:

Principle #9Preliminary anti-action

2Reliability

If hydraulic cylinders are used to move switch rails, then reliable point detection can be achieved, but the system becomes more complex and requires electric power for operation

Engineering Contradiction:

Improvepoint detection reliabilityVSAvoidsystem complexity without electric power

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces electric-powered detection systems with a purely mechanical detection mechanism. A mechanical target is coupled to the switch rod, and proximity sensors detect the position of this target mechanically. This substitution eliminates the need for complex electric power systems while maintaining reliable point detection capability, reducing device complexity in environments where electric power is unavailable.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of operation

If manual override provisions are incorporated, then operators can rectify track switching problems, but operator safety is compromised due to potential physical harm from switch movement

Engineering Contradiction:

Improvemanual override capabilityVSAvoidoperator safety risk

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The safety latch is designed to be engaged before manual operations are performed. This preliminary action of locking the switch points in place ensures that when operators perform manual override provisions, the switch points cannot move unexpectedly. The latch creates a safe working condition beforehand, allowing operators to work on the switch mechanism without risk of injury from sudden spring-driven movements.

Inventive Principle:

Principle #10Preliminary action

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

The solution provides reliable switch point detection and enables safe hand throw operations without electric power, preventing switch rail movements due to spring force during manual handling, thereby enhancing operator safety and preventing accidents.

Implementation Method 1

a hydraulic cylinder to move a switch rod

Methodology Applied

Scientific EffectHydraulic pressure: Hydraulic Press

Implementation Method 2

a spring unit to maintain the switch points in a predetermined position

Methodology Applied

Scientific EffectSpring force: Spring

Implementation Method 3

cam follower bearings to maintain switch points securely

Methodology Applied

Scientific EffectCam mechanism: Cam

Data Source

PatentUS12091071B2High-speed railway switch device for moving railroad switch points

Publication Date: 2024.09.17 RODRIGUES DILSON DOS SANTOS

AI summary

A railroad switch device for moving railroad switch points. The device includes a hydraulic unit having a hydraulic manifold coupled to a hydraulic pump integrated with an electric motor via a pressure pipe, where the hydraulic manifold is also coupled to the hydraulic pump via a hydraulic oil reservoir and a return pipe, and the hydraulic manifold is coupled to a hydraulic double-rod cylinder to provide forward movement and reverse movement of a point rod. Also included is a mechanical target to automatically indicate the position of a point rod, and a plurality of spring units to produce a continuous thrust force for holding the railroad switch points closed in forward position and reverse position, wherein the plurality of spring units control the target rotation to 90 degrees.