Brake Measuring Pin for Elevator Armature Position Detection
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Solution Overview
Problem
Conventional brake operation measurement in hoisting machines is unreliable due to oblique movement of the armature part, which can lead to asymmetrical movement and difficulty in observing the brake's operation, especially when the limit switch is positioned on the side with smaller movement.
Innovation Solution
A brake design that includes a movable measuring pin separate from the armature part, connected to a limit switch, which engages with the armature's movement and is protected by a thruster spring, allowing for reliable measurement of the armature's position between braking and releasing positions, and an adjustment mechanism to ensure accurate operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a limit switch is attached directly to the frame part to measure armature movement, then the device complexity is reduced, but the measurement precision deteriorates due to oblique and asymmetrical armature movement
Solution Approach 1:
A measuring pin is introduced as an intermediary component between the limit switch and the armature part. The measuring pin translates the oblique and asymmetrical movement of the armature into linear movement along the operating direction of the limit switch, ensuring reliable measurement while keeping the overall structure relatively simple.
Solution Approach 2:
The measurement function is segmented into two independent parts: the measuring pin that contacts the armature and the limit switch that detects the position. This segmentation allows the measuring pin to handle the complex armature movement while the limit switch maintains its simple switching function, resolving the contradiction between structural simplicity and measurement reliability.
2Device complexity
If the limit switch is positioned on the side with smaller armature movement, then the device complexity is minimized, but the measurement precision deteriorates due to difficulty in observing movement
Solution Approach 1:
The measuring pin acts as a mediator that extends the measurement capability to any position of the limit switch. Even when the limit switch is positioned on the side with smaller armature movement, the measuring pin ensures accurate translation of movement, making the measurement reliable regardless of switch position.
3Measurement precision
If the measuring pin is separate from the armature part, then the measurement precision is improved by accommodating asymmetrical movement, but the device complexity increases due to additional components
Solution Approach 1:
The measuring pin is a simple intermediary component that provides the necessary measurement functionality without requiring complex mechanisms. Its separate design from the armature part allows it to freely translate asymmetrical and oblique movements into linear displacement, improving measurement precision while adding minimal complexity.
4Ease of operation
If the measuring components are exposed, then the ease of operation is improved for installation and maintenance, but the reliability deteriorates due to susceptibility to external factors
Solution Approach 1:
The measuring pin and limit switch are nested within the brake structure, specifically positioned within the space between the armature part and the braking surface. This nesting provides natural protection from external factors like dirt and moisture while maintaining accessibility for installation and maintenance operations.
Data Source
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AI summary
The invention relates to a brake, which comprises a frame part (1) of the brake, an armature part (2) movably supported on the frame part, and attached to the frame part (1) a limit switch (3), the switching state of which changes when movement is exerted on the limit switch in the operating direction of the limit switch. The brake also comprises a measuring pin (3) that is movably supported on the frame part (1) of the brake and that is separate from the armature part (2), which measuring pin is connected to the limit switch (3).