Lifting Column Obstruction Detection Using Deformation Stress Sensing
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Solution Overview
Problem
Existing electric lifting mechanisms with obstruction detection systems are delayed in responding to obstructions due to insufficient deformation stress at the mounting position of the obstruction detector, leading to potential damage or injury.
Innovation Solution
An obstruction detection-enabled lifting column is designed with a screw rod and an obstruction detection plate, where a sensor is mounted on the plate to detect deformation stress instantly upon hitting an obstruction, enhancing response speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an obstruction detector is mounted on the lifting column to detect obstructions, then obstruction detection capability is provided, but the response is delayed because insufficient deformation stress is generated at the mounting position to activate the detector
Solution Approach 1:
The patent applies local quality by creating a specific deformation zone on the obstruction detection plate where the sensor is mounted. The plate is designed with varying local properties: the deformation zone has lower rigidity to concentrate deformation, while other areas maintain structural strength. This ensures that when an obstruction is detected, sufficient deformation stress is generated specifically at the sensor mounting position to activate it immediately, resolving the contradiction between detection capability and response time.
Solution Approach 2:
The patent changes the physical parameters of the obstruction detection plate by controlling its thickness and material properties in different zones. The deformation zone is designed with specific thickness parameters (e.g., 1-3mm) that are different from other parts of the plate. This parameter optimization ensures that the plate deforms sufficiently under obstruction load to activate the sensor instantly, while maintaining overall structural integrity, thus eliminating the response delay.
2Strength
If the obstruction detection plate is made more rigid to maintain structural strength, then structural integrity is improved, but deformation stress at the sensor mounting position becomes insufficient to activate the sensor
Solution Approach 1:
The patent resolves this contradiction by applying local quality through zoned design of the obstruction detection plate. The plate is divided into a deformation zone with optimized (lower) rigidity where the sensor is mounted, and other zones with higher rigidity for structural support. This localized differentiation allows the plate to be sufficiently rigid overall while generating adequate deformation stress at the specific sensor mounting position, thus maintaining both structural integrity and measurement precision.
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 a highly sensitive obstruction detection feature, improving safety and reliability by enabling instant detection and response to obstructions, thus preventing damage or injury.
Implementation Method 1
a sensor configured to detect a deformation stress on the obstruction detection plate is arranged on the obstruction detection plate
Data Source
AI summary
An obstruction detection-enabled lifting column includes a screw rod and an obstruction detection plate configured on the screw rod, an assembly hole being formed in the obstruction detection plate, the screw rod passing through the assembly hole; a sensor configured to detect a deformation stress on the obstruction detection plate is arranged on the obstruction detection plate, a fixing part configured to securely mount the obstruction detection plate is provided on either side of the sensor, respectively, a central angle formed by a connecting line between one end of the sensor and a center of the assembly hole and a connecting line between an opposite end of the sensor and the center of the assembly hole is less than 360°, and a perpendicular bisector of a connecting line between centers of two fixing parts passes through the sensor.