Intersecting Under-Car Pulley Arrangement for Dual Elevator Cars
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Solution Overview
Problem
In double-deck elevator systems, passengers often face inconvenience as they need to transfer between cars dedicated to odd and even-numbered floors, and there is a need to reduce the overall installation area in buildings while maintaining passenger capacity.
Innovation Solution
The elevator system features two independently controlled cars within a single hoistway, with under-car pulleys arranged to intersect when projected horizontally, allowing ropes to be wound on different sides of the main rails, and counterweights positioned to avoid interference, enabling efficient and space-saving operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a double-deck elevator system is used to reduce installation area, then the number of elevators is reduced, but passengers must transfer between cars dedicated to odd and even floors, reducing convenience
Solution Approach 1:
Both elevator cars are configured to serve all floors rather than being dedicated to specific floor groups. The first car can serve all floors and the second car can also serve all floors, allowing passengers to directly board the desired car without transfer, thus eliminating the floor-dedication constraint while maintaining space efficiency
2Area of stationary object
If two elevators are arranged in a single hoistway to increase transportation capability, then the installation area is reduced, but the rope arrangement becomes complex and may cause interference
Solution Approach 1:
The under-car pulleys of the first and second cars are arranged asymmetrically relative to the hoistway centerline. Specifically, the pulley arrangement direction of the first car intersects with that of the second car when projected onto a horizontal plane, creating a non-symmetric configuration that effectively separates the rope paths and prevents interference between the two elevator systems
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 allows for independent operation of both cars without interference, reducing the required installation area and enhancing passenger convenience by eliminating the need for separate cars for odd and even floors, while maintaining high-speed movement capabilities.
Implementation Method 1
a pair of under-car pulleys are respectively disposed at the lower portions of the elevator cars to turn ropes vertically on the outer sides of the first and second elevator cars and horizontally on the bottoms of the cars
Implementation Method 2
pulleys respectively attached to counterweights balancing the first and second elevator cars
Data Source
AI summary
An elevator system capable of reducing the overall installation area of elevators in a building while ensuring the number of passengers in the elevator. The elevator system arranges first and second elevator cars in a single elevator hoistway, having, at a lower portion of each of the first and second elevator cars, respectively, a pair of undercar pulleys are positioned to turn ropes vertically on the outer sides of the first and second elevator cars and horizontally at the bottom, where the arranging direction of the pair of the under-car pulleys of the first elevator car intersects with the arranging direction of the pair of under-car pulleys of the second elevator car when projected onto a horizontal plane.