Double-Decker Elevator Closed-Loop Traction System
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Solution Overview
Problem
Existing double-decker elevator systems face challenges in optimizing space for elevator cabs and simplifying the mechanism for adjusting the distance between elevator cars, often requiring complex belt guides and additional tensioning means to prevent car movement during emergencies.
Innovation Solution
An elevator system with a first elevator car adjustably arranged on a carrier, utilizing a closed-loop traction means with a drive unit and guide rollers to suspend and tension the car, allowing for simultaneous adjustment of two elevator cars in opposite directions, thereby eliminating the need for additional tensioning means and simplifying the mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If belts are used for suspension and adjustment of elevator cars, then smaller bending radii and smaller guide roller diameter can be achieved, but the belt guide mechanism becomes relatively complicated with many guide rollers
Solution Approach 1:
The patent combines the suspension function and tensioning function into a single closed-loop traction means. The closed-loop design eliminates the need for separate tensioning mechanisms while maintaining proper belt tension through the loop configuration itself, thereby reducing the number of guide rollers and simplifying the overall guide mechanism.
Solution Approach 2:
The closed-loop traction means serves multiple functions simultaneously: it suspends the elevator car, provides tensioning through its loop configuration, and enables adjustment of the car position. This multi-functionality reduces the need for separate dedicated components for each function, simplifying the mechanism.
2Reliability
If additional tensioning means are added to prevent elevator car jumping during emergencies, then safety is improved, but the mechanism complexity increases
Solution Approach 1:
The patent merges the tensioning function required for safety during emergencies with the suspension function in a single closed-loop traction means. The closed-loop configuration inherently maintains tension without requiring additional separate tensioning devices, thus improving safety while avoiding increased complexity.
3Area of stationary object
If the distance between elevator cars is adjusted using complex belt guides, then space optimization is achieved, but the adjustment mechanism becomes complicated
Solution Approach 1:
The patent combines position adjustment and tension maintenance functions into the single closed-loop traction means. The loop configuration allows the car to be adjusted to different positions along the loop while the loop itself maintains proper tension throughout the adjustment range, eliminating the need for complex separate adjustment and tensioning mechanisms.
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 design optimizes space, reduces complexity, enhances driving comfort by minimizing natural vibrations, and ensures secure car positioning during emergencies, while allowing for a smaller drive unit and improved load distribution.
Implementation Method 1
The traction means is guided via a drive roller and at least one guide roller, both of which are arranged on the elevator carrier
Implementation Method 2
A guide roller is arranged displaceably on the elevator car carrier. A tension of the traction means can be adjusted by means of a position shift of the guide roller. As a result, undesired natural vibrations of the traction means can be minimized
Data Source
AI summary
The invention relates to a lift installation (1) having at least one lift-car carrier (2) which can be displaced in a travel space (3) provided for the travel of the lift-car carrier (2). The lift installation comprises a first lift car (11), which is arranged in an adjustable manner on the lift-car carrier (2), also comprises at least one second lift car (12), which is arranged on the lift-car carrier (2), further comprises a drive unit (18), which is arranged on the lift-car carrier (2), and additionally comprises at least one traction means (19). At least the first lift car (11) here can be adjusted relative to the lift-car carrier (2) by the drive unit (18) using the traction means (19). The traction means (19) forms a closed loop. In addition, the traction means (19) is guided over a drive roller (20) and at least one guide roller (21), which are both arranged on the lift carrier (2). The invention is distinguished in that a guide roller is arranged in a displaceable manner on the lift-car carrier (2), wherein it is possible to set tensioning of the traction means (19) by means of displacing the guide roller (21).