Laser Displacement Sensor for Elevator Hydraulic Buffer Testing
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Solution Overview
Problem
Current methods for detecting the compression and reposition performance of hydraulic buffers in elevators are subjective, inaccurate, and inefficient, leading to potential safety issues due to manual timing and visual inspection challenges, which fail to reliably assess the safety performance of hydraulic buffers.
Innovation Solution
A device and method utilizing a laser displacement sensor, signal conditioning and acquisition circuit, and controller to measure the distance changes between a reflector on the hydraulic buffer and the sensor, enabling automated data acquisition and calculation of compression stroke, reposition time, and detection of potential jamming, with high measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual visual inspection and timing are used to detect buffer performance, then the detection method is simple and requires no special equipment, but the measurement accuracy is low and human factors cause large errors
Solution Approach 1:
The patent replaces manual visual inspection and mechanical timing with an automated optical detection system. A laser displacement sensor automatically measures the position of the buffer and cage, while a controller with timing circuitry automatically records compression time and reposition time, eliminating human factors from the measurement process and significantly improving measurement accuracy.
Solution Approach 2:
The patent introduces a reflector as an intermediary element attached to the buffer. The laser displacement sensor measures the position of the reflector instead of directly measuring the buffer, which facilitates accurate and non-contact measurement of the buffer's compression and reposition movements.
2Object-affected harmful factors
If the inspector monitors from outside the cage or machine room, then personal safety is improved, but the ability to accurately judge compression stroke and reposition timing is reduced
Solution Approach 1:
The patent replaces the inspector's visual judgment with an automated optical measurement system. The laser displacement sensor continuously tracks the position of the reflector on the buffer, and the controller automatically determines compression and reposition events based on predefined thresholds, eliminating the trade-off between safety distance and measurement accuracy.
Solution Approach 2:
The system continuously monitors the distance between the laser sensor and the reflector, providing real-time feedback to the controller. When the distance change exceeds predefined thresholds, the controller automatically records the compression and reposition events, ensuring accurate measurement without requiring the inspector to be in close proximity.
3Productivity
If automated detection equipment is used, then measurement accuracy and detection efficiency are improved, but the device complexity increases
Solution Approach 1:
The laser displacement sensor serves multiple functions: it measures the compression stroke, determines compression timing, and tracks reposition timing. The same sensor and controller system handles all detection tasks, reducing the need for multiple separate devices and minimizing overall system complexity while maintaining high detection efficiency.
Solution Approach 2:
The reflector acts as a simple intermediary that enables the laser sensor to accurately track the buffer's position. This simple passive component facilitates complex measurements without adding significant system complexity, as it requires no power source or active elements.
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 automated, accurate, and efficient measurement of hydraulic buffer performance, enhancing detection efficiency and safety by reducing human error and improving the timely assessment of safety performance.
Implementation Method 1
a laser displacement sensor is configured to transmit and receive a laser beam to measure a change in distance between a reflector on the top of the hydraulic buffer for the elevator and the laser displacement sensor
Data Source
AI summary
Disclosed are a device and a method for detecting compression and reposition performance of a hydraulic buffer for an elevator. The device includes a laser displacement sensor, a battery charge and power supply circuit and a controller, where the laser displacement sensor is connected to the controller through a signal conditioning and acquisition circuit and a laser emission control circuit; and where the controller is also connected to a memory and a configuration screen, respectively. It can realize the automation of multi-parameter measurement functions of a buffer, such as compression stroke measurement, reposition time measurement and reposition process monitoring (which can reflect whether the reposition process is jammed), and has a high measurement accuracy.