Elevator Car Door Detection Using Vertical Magnetic Proximity
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Solution Overview
Problem
Existing elevator car door detection apparatuses using magnetic proximity switches require precise adjustment of the detection distance, making them time-consuming and labor-intensive for installation and setup.
Innovation Solution
The proposed elevator car door detection apparatus configures one of a magnetic proximity switch and a target on a horizontal part extending from the frame's upper end and the remaining one on an extending part from the door hanger, allowing for vertical opposition and simplified adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a magnetic proximity switch is used to detect full opening and full closure of the car door, then detection capability is provided, but precise adjustment of the detection distance is required which makes installation and setup time-consuming and labor-intensive
Solution Approach 1:
The patent changes the detection direction from the depth direction (front-to-back of the car) to the vertical direction (up-down). The magnetic proximity switch is disposed on the front surface of the frame in the vertical direction, and the detection plate is disposed on the door hanger. This dimensional change allows the detection to occur in the vertical direction where the door hanger naturally moves, eliminating the need for precise depth-direction adjustment while maintaining detection precision.
2Measurement precision
If the magnetic proximity switch and detection plate are disposed to be opposed in the depth direction, then detection function is achieved, but precise adjustment in both depth direction and vertical direction is required
Solution Approach 1:
The patent reorients the detection system from depth-direction opposition to vertical-direction opposition. By disposing the magnetic proximity switch on the front surface of the frame and the detection plate on the door hanger, the system utilizes the vertical movement of the door hanger for detection, reducing adjustment complexity to only the vertical direction while maintaining precise detection functionality.
3Measurement precision
If the detection distance is made short for magnetic proximity switch, then detection sensitivity is improved, but positional relationship adjustment becomes more critical and time-consuming
Solution Approach 1:
The patent resolves the contradiction between detection sensitivity and adjustment ease by changing the detection dimension from depth to vertical direction. The magnetic proximity switch is positioned on the front surface of the frame facing downward, and the detection plate is positioned on the door hanger. This allows the short detection distance to be achieved in the vertical direction where the door hanger's movement provides natural positioning, significantly easing the adjustment process while maintaining high detection sensitivity.
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
This configuration simplifies the adjustment process, reduces the need for precise depth direction adjustments, and allows for precise detection of full opening and full closure of the car door, saving time and effort in installation.
Implementation Method 1
a magnetic proximity switch disposed on a front surface on an entrance side of a frame so as to detect a detection plate disposed on a door hanger
Data Source
AI summary
Car doors hanging down via door hangers are disposed on a door rail that is disposed on a vertically-oriented frame disposed above an entrance of a car and extends along a width direction of the entrance of the car. One of a magnetic proximity switch and a target for detecting that the car doors are fully open and fully closed is disposed on a horizontal part extending from an upper end of the frame toward the entrance of the car. The remaining one of the magnetic proximity switch and the target is disposed on an extending part extending from each of the door hangers so as to be opposed in a vertical direction to the one of the magnetic proximity switch and the target for detection.