Electronic Safety Elevator Pulse Position Detection
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Solution Overview
Problem
Conventional elevator safety systems rely on mechanical safety switches, which wear out, require frequent maintenance, occupy space, and are difficult to make highly functional, leading to reliability issues and increased maintenance costs.
Innovation Solution
An electronic safety system that uses a pulse generator, position detector, and safety controller to detect the car's position and output commands based on pre-stored values, reducing the need for mechanical switches and enabling self-diagnosis and efficient maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical safety switches are used to detect car position and control elevator safety, then the elevator can achieve basic safety functions, but the mechanical components wear out, require frequent maintenance, and have reliability issues
Solution Approach 1:
The patent replaces mechanical safety switches with an electronic safety system that uses a pulse generator to generate position signals, a counter to count pulses, and a microprocessor to control safety functions. This substitution eliminates mechanical wear and improves reliability while reducing maintenance requirements.
Solution Approach 2:
The electronic safety system incorporates self-diagnosis functionality where the microprocessor monitors the system state and can detect abnormalities automatically. The system performs self-checks and can identify faults without requiring manual inspection, reducing the need for frequent maintenance checks.
2Reliability
If mechanical safety switches are installed in the elevator shaft to ensure safety, then safety functions are achieved, but the shaft space is occupied and layout is restricted
Solution Approach 1:
The patent replaces space-consuming mechanical safety switches with electronic components that can be mounted on the elevator car itself or integrated into existing structures. The pulse generator and associated electronics eliminate the need for extensive mechanical switch installations in the shaft, freeing up space.
3Reliability
If mechanical safety switches are used for elevator safety control, then basic safety functions are achieved, but the system is difficult to make highly functional and cannot achieve sufficient deceleration control
Solution Approach 1:
The patent implements dynamic deceleration control where the microprocessor calculates required deceleration based on real-time position feedback from pulse counting. The system can adjust deceleration rates dynamically according to the specific safety condition and car position, enabling highly functional and adaptive safety control that mechanical switches cannot achieve.
Solution Approach 2:
The electronic safety system can change operational parameters such as deceleration rate, stop position, and safety threshold values through software programming rather than mechanical adjustment. This allows the system to be highly functional and adaptable to different safety requirements without physical reconfiguration.
4Reliability
If mechanical safety switches are installed to provide safety coverage, then safety functions are achieved, but maintenance work varies depending on technician skill and system complexity
Solution Approach 1:
The electronic safety system includes self-diagnosis capabilities where the microprocessor automatically monitors system health, detects faults, and provides diagnostic information. This standardizes maintenance by enabling technicians to rely on system-generated diagnostic data rather than requiring expert manual inspection, making maintenance work more consistent and less dependent on individual technician skill levels.
Data Source
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AI summary
More-highly functional safety is achieved, and the number of mechanical safety switches is reduced. Thus the number of subjects of maintenance and inspection is decreased, and reliability is increased. Disclosed is an electric safety elevator wherein detection is made of the position of a cage (20) which moves among a plurality of floors in a hoistway. The electric safety elevator is provided with a pulse generator (8) which outputs pulses according to the movement amounts of the cage (20); a position detection device (27) which detects that the cage (20) has reached a predetermined position; and a safety controller (2) which counts the number of pulses after the predetermined position is detected, and which, when the counted value becomes equal to a value stored in advance, outputs instructions that correspond to the stored value.