Elevator Brake Switch Self-Checking via Coil Voltage Timing
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Solution Overview
Problem
Elevator brake systems face issues with accurate detection of the brake switch position due to positional changes, leading to safety concerns and frequent emergency repairs.
Innovation Solution
A self-checking device and method that monitors the position of the brake switch by controlling the voltage applied to the electromagnetic coil, recording trigger times and current fluctuations, and determining the switch position based on predefined time and current relationships.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the brake switch is installed on the stationary plate to detect the position state of the movable plate, then the position detection function is achieved, but the position of the brake switch changes after repeated contact leading to inaccurate detection
Solution Approach 1:
The patent inverts the traditional detection approach by moving the brake switch from the stationary plate to the movable plate. This inversion allows the brake switch to move together with the movable plate, eliminating relative position changes and contact wear issues, thereby maintaining accurate and reliable position detection throughout the brake device's operation.
2Device complexity
If the brake switch position is fixed on the stationary plate, then the structure is simple, but the elevator system cannot operate normally when the position changes due to safety considerations
Solution Approach 1:
The patent relocates the brake switch from the stationary plate to the movable plate, creating a moving brake switch that maintains a constant relative position relationship with the movable plate. This solution maintains structural simplicity while ensuring reliable operation by eliminating position drift issues that compromise safety.
3Ease of operation
If the brake switch is repeatedly contacted by the movable plate to detect position changes, then the position state feedback is achieved, but the position of the brake switch changes leading to frequent emergency repairs
Solution Approach 1:
The patent attaches the brake switch to the movable plate instead of the stationary plate. This inversion eliminates the relative movement and contact wear between the brake switch and movable plate, maintaining accurate position state feedback while significantly reducing emergency repairs related to brake switch position changes.
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
Provides early detection and notification of brake switch deviations, preventing elevator malfunctions by ensuring the brake switch is correctly positioned during routine maintenance.
Implementation Method 1
an electromagnetic coil (17), which can generate a magnetic field when energized
Data Source
AI summary
A self-checking device and a self-checking method for an elevator brake device, as well as an elevator system. The self-checking device includes: a controller, which controls a voltage applied to an electromagnetic coil of the elevator brake device, and which is configured to: enable an elevator to enter a test mode; gradually increase the voltage applied to the electromagnetic coil of the brake device in a predetermined pattern when the brake device is in a braking state, or gradually decrease the voltage applied to the electromagnetic coil of the brake device in a predetermined pattern when the brake device is in a non-braking state; and a processor, which is configured to receive and record a first time t1 when a brake switch of the brake device is triggered, and determine whether the brake switch is in a proper position based on the first time t1.