Counterweight Speed Governor Vertical Placement in MRL Elevators
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Solution Overview
Problem
Conventional machine-room-less elevators require expansion of the hoistway's planar dimensions to accommodate the counterweight speed governor, which is inefficient in utilizing space.
Innovation Solution
The counterweight speed governor is positioned higher than the counterweight when it jumps upward, aligned with the first counterweight guide rail in the width direction and between the driving sheave and counterweight suspending sheave, allowing for efficient use of space within the hoistway.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the counterweight speed governor is disposed at a position that lines up with the counterweight when the counterweight is moved to an uppermost portion, then the speed governor can effectively detect overspeed, but the frontage dimension of the hoistway must be expanded
Solution Approach 1:
The counterweight speed governor is repositioned from a horizontal alignment with the counterweight (frontage direction) to a vertical arrangement where it is disposed higher than the counterweight's uppermost position. This dimensional change allows the speed governor to remain aligned with the counterweight for effective overspeed detection while eliminating the need to expand the hoistway's frontage dimension, as the alignment is achieved in the vertical dimension rather than the horizontal dimension.
2Area of stationary object
If the counterweight speed governor is disposed higher than the counterweight's uppermost position, then the planar dimensions of the hoistway are suppressed, but the alignment with the counterweight during movement must be maintained
Solution Approach 1:
The speed governor is equipped with a detection portion that is specifically oriented and positioned to detect the movement state of the suspending body at the local position where it passes by during counterweight movement. This localized detection capability ensures that even though the speed governor is disposed higher than the counterweight's uppermost position, it can still effectively monitor the suspending body's movement and detect overspeed conditions without requiring complex alignment mechanisms throughout the entire movement range.
Data Source
AI summary
In a machine-room-less elevator, a hoisting machine is disposed directly above a counterweight. A counterweight speed governor is disposed higher than a position of the counterweight if a car descends to a floor portion of a hoistway and the counterweight jumps upward. When viewed from directly above, at least a portion of the counterweight speed governor is disposed at an identical position to a first counterweight guide rail in a width direction of the counterweight, and is disposed at an identical position to a portion of a suspending body between a driving sheave and a counterweight suspending sheave in a direction that is perpendicular to the width direction of the counterweight.