Elevator Car Pulley Beam Load Balancing via Asymmetric Compensator
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Solution Overview
Problem
Conventional elevators require strengthening the lower portion of the car to handle increased load at the uppermost floor, leading to higher costs.
Innovation Solution
An elevator design featuring a car suspending pulley device with parallel beams on the car and a weight suspending pulley on the counterweight, where a compensating member with a funicular body is connected to only one beam and the counterweight, allowing the downward load to cancel out the upward load from the main rope, reducing the need for increased beam strength and simplifying the configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the lower portion of the car is strengthened to handle increased load at the uppermost floor, then the load-bearing capacity is improved, but the manufacturing cost increases
Solution Approach 1:
The patent extracts the compensating function from the car's lower portion structure and relocates it to a separate compensating member (balance chain) connected to the counterweight. This transfers the load-compensation function away from the car's lower portion, eliminating the need to strengthen it, thereby reducing manufacturing cost while maintaining load-bearing capacity.
Solution Approach 2:
The patent employs a counterweight system with a compensating member that generates an opposing force to balance the load on the car. The compensating member connects the car to the counterweight, creating a counterbalancing mechanism that offsets the increased load at the uppermost floor without requiring structural strengthening of the car's lower portion.
2Stability of the object's composition
If a compensating member is connected to both beams of the car suspending pulley device, then the balance is improved, but the device complexity increases
Solution Approach 1:
The patent applies asymmetric connection by attaching the compensating member to only one beam of the car suspending pulley device rather than both beams symmetrically. This asymmetric configuration achieves the required balance function while reducing the number of connection points and simplifying the overall structure, thereby reducing device complexity.
Solution Approach 2:
The single beam connection point serves multiple functions: it anchors the compensating member, transmits the balancing force, and maintains structural stability. This multi-functional use of a single connection point eliminates the need for separate connection mechanisms on both beams, simplifying the device while maintaining balance.
3Stress or pressure
If the compensating member is positioned away from the beam region, then the load distribution is improved, but the maintenance accessibility is worsened
Solution Approach 1:
The patent positions the compensating member's first end portion within the vertical region of the beam (when viewed from the vertical direction) rather than laterally adjacent to it. This dimensional repositioning allows the compensating member to effectively share the load with the beam while clearing the horizontal space needed for maintenance personnel to access and work on the lower portion of the car.
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 reduces costs by minimizing the number of parts, simplifying the configuration, and preventing the compensating member from obstructing maintenance, making maintenance easier and more efficient.
Implementation Method 1
a compensating member including a funicular body having a first end portion connected to only one of the pair of beams and a second end portion connected to the counterweight, and suspended between the one beam and the counterweight
Implementation Method 2
a downward load of the compensating member can be applied to the beam, to which an upward load of a main rope from which the car is suspended is applied, in a direction that cancels out the upward load
Implementation Method 3
a car suspending pulley arranged between the pair of beams and supported by the pair of beams, a weight suspending pulley provided on the counterweight, and a main rope wrapped around the car suspending pulley and the weight suspending pulley and suspending the car and the counterweight
Data Source
AI summary
This invention is concerning a car suspending pulley device including a pair of beams provided parallel to each other on a lower portion of a car and a car suspending pulley arranged between the pair of beams and supported by the pair of beams. A weight suspending pulley is provided on a counterweight. The car and the counterweight are suspended from a main rope wrapped around the car suspending pulley and the weight suspending pulley. A compensating member is suspended between the beams and the counterweight. The compensating member includes a funicular body having a first end portion connected to only one of the pair of beams and a second end portion connected to the counterweight. The first end portion of the funicular body is located in a region of the one beam when viewed in a vertical direction.