Industrial Door Fall Protection via Motor-Leaf Ratio Comparison
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Solution Overview
Problem
High-speed industrial gates with vertically movable door leaves face material stress and increased risk of failure due to high movement speeds and cycles, leading to potential falls that pose dangers to objects and people, and existing fall protection systems may not reliably detect and prevent such incidents.
Innovation Solution
A system that uses measuring devices to determine the movement parameters of the door leaf and motor, evaluating these parameters against a defined relationship to detect malfunctions and trigger a braking device, which includes a friction brake for controlled deceleration, ensuring quick and safe stopping of the door leaf.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high movement speeds and cycles are used to improve productivity, then door operation efficiency is improved, but material stress and risk of material failure due to wear increase
Solution Approach 1:
The fall protection mechanism is activated in advance by detecting abnormal door acceleration or velocity before complete failure occurs. The tachometer continuously monitors door speed, and when predefined thresholds are exceeded, the locking bolts are immediately deployed to prevent catastrophic failure, thus protecting against wear-related failures during high-speed operation
Solution Approach 2:
The system prepares protective measures in advance by pre-tensioning the locking bolts and having them ready for immediate deployment. This preliminary preparation ensures that when material failure begins to occur during high-speed cycles, the protection mechanism is already in place to cushion the impact and prevent complete door collapse
2Productivity
If high movement speeds are used to improve productivity, then door operation efficiency is improved, but the risk of material failure due to friction and wear increases
Solution Approach 1:
The system converts the harmful effect of high-speed operation into a detectable signal by using the tachometer to monitor velocity. The very high speeds that cause increased wear also create measurable changes in rotational velocity that trigger the protection mechanism, thus transforming the harmful condition into a useful detection signal for activating protection
3Reliability
If a fall protection mechanism with locking bolts is used to improve safety, then door fall protection is improved, but the complexity of the door system increases
Solution Approach 1:
The tachometer provides continuous feedback on door velocity, and this feedback is used by the control system to automatically activate the locking bolts when abnormal speeds are detected. This feedback loop enables the complex protection function to be triggered automatically based on simple speed measurements, reducing the need for complex manual control systems while maintaining high reliability
4Device complexity
If existing fall protection systems based on speed limits are used, then simple triggering is achieved, but they cannot detect falls at slow but uncontrollable speeds
Solution Approach 1:
Instead of using a fixed speed threshold, the system dynamically monitors the relationship between tachometer readings and expected door position. This dynamic approach allows detection of abnormal movements at any speed by comparing actual tachometer data with predicted values based on door position, enabling detection of slow uncontrollable falls that would be missed by fixed threshold systems
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 system provides reliable and rapid activation of the braking device to prevent door leaf falls, even at slow but uncontrollable downward movements, reducing the risk of damage and injury while minimizing wear during braking.
Implementation Method 1
a first measuring device (6) which determines a movement parameter of the door leaf (10)
Implementation Method 2
a second measuring device (1) which determines a movement parameter of the motor (3), in particular the speed or position of the shaft of the motor
Implementation Method 3
The braking device can possibly stop a closing movement of the door within a defined braking distance
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a door having a fall protection mechanism, comprising a door leaf (10) which can be opened and closed via the rotation of a door leaf drive (5), a motor (3) which is coupled to the door leaf drive, and a braking device (7) by means of which the opening and/or closing of the door leaf can be delayed, as well as a first measuring device (6) for determining at least one movement parameter of the door leaf. In order to improve a door of this type such that a falling of the door can be reliably detected, and likewise a braking device is reliably triggered, which quickly brakes the door and thereby prevents damage to the door, according to the invention, a second measuring device (1) is provided for determining at least one movement parameter of the motor, and a comparator (9) which compares the measured movement parameters of the door leaf and of the motor and triggers the braking device, if the measured movement parameter of the door leaf and of the motor fall outside of a defined ratio to one another.