Guide Rail Sensor Layout for Industrial Door Derailment Detection

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Solution Overview

Problem

Conventional safety devices for industrial doors, particularly roller and foil doors, face challenges in assembly due to the need for sensors mounted on the moving parts, which is technically difficult and limits data transmission methods, especially for flexible doors that roll up.

Innovation Solution

A stationary optical sensor system with an acceleration sensor is positioned on the guide rail, detecting vibrations to prevent door derailment, using a light barrier or light grid, and an evaluation unit analyzes these vibrations to ensure safety without requiring the sensor to move with the door.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If sensors are mounted on the moving part of the industrial door, then safety detection capability is improved, but assembly difficulty increases and data transmission flexibility is limited

Engineering Contradiction:

Improvesafety detection capabilityVSAvoidassembly difficulty

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

Instead of mounting the sensor on the moving door (conventional approach), the patent inverts the arrangement by mounting the sensor on the stationary guide rail. The optical sensor system remains fixed while the door moves past it, allowing the sensor to detect vibrations and derailment conditions without being attached to the moving part. This resolves the assembly difficulty while maintaining safety detection capability.

Inventive Principle:

Principle #13The other way round (Inversion)

2Reliability

If sensors are mounted on the moving part of the industrial door, then safety detection capability is improved, but data transmission flexibility is limited

Engineering Contradiction:

Improvesafety detection capabilityVSAvoiddata transmission flexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent inverts the conventional mounting approach by placing the sensor on the stationary guide rail rather than on the moving door. This allows the sensor to remain fixed in position while the door moves through its range of motion, enabling flexible data transmission via wired connections to the control unit without requiring wireless communication or complex moving connections.

Inventive Principle:

Principle #13The other way round (Inversion)

3Reliability

If conventional sensors are used for roller and foil doors, then safety detection is achieved, but assembly becomes technically difficult

Engineering Contradiction:

Improvesafety detectionVSAvoidassembly complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent simplifies assembly for roller and foil doors by inverting the sensor mounting location from the moving door to the stationary guide rail. This eliminates the technical difficulties of mounting sensors on flexible, rolling doors while maintaining the ability to detect vibrations and derailment conditions through the guide rail structure.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The optical sensor system mounted on the guide rail serves multiple functions: detecting door derailment through vibration analysis, monitoring door position, and providing safety detection for various door types (roller, foil, sectional). This universal application reduces assembly complexity across different door configurations.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

This solution provides a flexible and safe safety device for various door types by eliminating the need for sensor assembly on moving parts, enhancing data transmission flexibility, and ensuring immediate detection of malfunctions.

Implementation Method 1

an acceleration sensor which can detect vibrations is arranged in the housing

Methodology Applied

Scientific EffectVibration detection: Vibration

Implementation Method 2

allowing vibrations to be mechanically transmitted from the guide rail to the casing

Methodology Applied

Scientific EffectMechanical vibration transmission: Vibration

Implementation Method 3

the optical sensor system, which is typically parallel to or perpendicular to the guide rail and which can detect vibrations

Methodology Applied

Scientific EffectLight barrier detection: Light

Data Source

PatentEP4571036B1Safety device with acceleration sensor for industrial doors

Publication Date: 2026.02.04 CEDES AG

Figure 1

AI summary

The invention relates to a safety device (14) for industrial doors (13) that are movably mounted between two guide rails (12), comprising at least one optical sensor system (15) for detecting objects. The optical sensor system (15) is mounted in at least one housing (1), which can be fastened to the guide rails. In order to be able to impose lower assembly requirements while maintaining at least the same level of safety, the housing (1) and/or at least one of the housings (1) has an acceleration sensor (B) for measuring vibration and for supplying vibration data, from which an evaluation unit (1b) evaluates whether the door has veered out of the guide.