Elevator Terminal Deceleration Sensor Consistency Check
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Solution Overview
Problem
Conventional termination floor forced deceleration devices for elevators require complex installation and adjustment of cams, leading to increased material costs and longer setup times, especially as elevator rated speeds increase, due to the need for longer cam lengths to detect car position accurately.
Innovation Solution
A termination floor forced deceleration device using two side-by-side position detection sensors and a consistency check circuit to determine if the car is within a predetermined distance from the shaft terminal, eliminating the need for cams and simplifying installation by recognizing terminal position through sensor output consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the operating point for detecting the position of car is set at a position far from the terminal, then the car speed can be checked at a farther position from the terminal, but the necessary overall length of cam is enlarged and the installation and adjustment becomes troublesome
Solution Approach 1:
The patent replaces the mechanical cam-based position detection system with a non-contact sensor system. Position detection sensors directly detect the actuation plate on the car without requiring mechanical contact through a cam, eliminating the need for long cams and their complex installation and adjustment procedures.
Solution Approach 2:
The patent uses multiple position detection sensors arranged side by side to detect the actuation plate. By checking whether both sensors detect the plate simultaneously, the system determines car position without requiring a long cam structure, thus simplifying installation while maintaining detection accuracy.
2Loss of time
If the overall length of cam enlarges, then the car position can be detected at a farther position from the terminal, but the amount of material necessary for manufacturing the cam increases and the cost increases
Solution Approach 1:
The patent substitutes the mechanical cam structure with electronic position detection sensors. The sensors detect the car's actuation plate using non-contact methods, eliminating the need for material-intensive cam components while achieving the same function of detecting car position at a predetermined distance from the terminal.
Solution Approach 2:
The patent extracts the position detection function from the mechanical cam structure and implements it through separate position detection sensors. This separation allows the detection function to be achieved without the material burden of a long cam, reducing manufacturing costs while maintaining the ability to detect car position at the required distance.
3Reliability
If a cam system is used for position detection, then the car position can be detected, but the installation and adjustment requires troublesome effort and time is lengthened
Solution Approach 1:
The patent replaces the mechanical cam-based detection system with non-contact position sensors that detect the actuation plate on the car. This substitution eliminates the complex installation and adjustment of cams while maintaining reliable position detection through the consistency check of multiple sensors.
Solution Approach 2:
The position detection sensors automatically detect the car's position by sensing the actuation plate without requiring manual adjustment or calibration. The system self-regulates by checking whether both sensors detect the plate simultaneously, eliminating the troublesome manual adjustment process inherent in cam-based systems.
Data Source
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AI summary
There is provided a termination floor forced deceleration device of an elevator, in which the installation and adjustment can be simplified, and the time necessary for installation and adjustment can be shortened. For this purpose, in the termination floor forced deceleration device of an elevator, which has an overspeed monitoring section which outputs a braking instruction for decelerating a car in the case where the speed of the car lying at a position within a predetermined distance from the terminal of the shaft is not lower than a predetermined speed set in advance, an actuation plate provided on the car; two position detection sensors which are arranged side by side along the rising/lowering path of the car in the shaft and detect the actuation plate; and a consistency check circuit which reverses an output from itself, based on the outputs of both of the two position detection sensors, in the case where the outputs of the both are consistent with each other. Also, the overspeed monitoring section, based on the output from the consistency check circuit, recognizes whether or not the car lies at the position within the predetermined distance from the terminal of the shaft.