Elevator Machine Base Side Beam Integration
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Solution Overview
Problem
Conventional machine-roomless elevators face challenges in design and installation due to the need to mount car rope fastening beams to the building, which increases costs and requires enlarging the hoistway if a building post protrudes into the corner, limiting carrying capacity and complicating the design process.
Innovation Solution
The elevator apparatus features a configuration where the tension of the suspending means is distributed between side beams fixed to the machine base and car guide rails, allowing the car rope fastening members to be mounted internally, eliminating the need to attach them to the building and enabling central counterweight placement without enlarging the hoistway.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the car rope fastening beam is fixed to the building, then the main rope can be properly supported, but the installation cost increases and design time is extended
Solution Approach 1:
The car rope fastening beam is merged with the machine base structure, creating an integrated support system. The machine base now serves dual functions: supporting the hoisting machine and anchoring the car rope fastening beam, eliminating the need for separate building attachments.
Solution Approach 2:
The machine base acts as an intermediary structure between the hoisting machine and the car rope fastening beam. This intermediate platform provides a stable mounting surface for the fastening beam without requiring direct attachment to the building structure.
2Strength
If the car rope fastening beam is fixed to the building, then structural support is achieved, but construction cost increases
Solution Approach 1:
The car rope fastening beam is merged with the machine base structure, creating an integrated support system. The machine base now serves dual functions: supporting the hoisting machine and anchoring the car rope fastening beam, eliminating the need for separate building attachments.
3Device complexity
If the counterweight is placed close to the hoistway side wall, then the hoisting machine can be installed in the corner, but the main rope cannot pass through the car's center of gravity
Solution Approach 1:
The car suspending sheaves are positioned asymmetrically on the car structure. The first car suspending sheave is offset from the car's centerline, allowing the main rope to pass through the car's center of gravity while maintaining proper rope tension and alignment.
4Adaptability or versatility
If the hoistway is enlarged to accommodate building post protrusions, then the counterweight can be properly positioned, but the carrying capacity is reduced
Solution Approach 1:
The requirement for building post accommodation is extracted from the hoistway design. Instead of enlarging the hoistway to fit around posts, the counterweight and hoisting machine are positioned to work with the existing hoistway dimensions, taking the post obstruction out of the design constraint equation.
Data Source
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AI summary
In an elevator apparatus, a machine base that supports a hoisting machine and a counterweight rope fastening member is fixed to upper portions of counterweight guide rails. First and second side beams are disposed in an upper portion inside the hoistway. The first and second side beams are disposed on two sides of a car when viewed from directly above, and are fixed to the machine base or upper portions of the counterweight guide rails and upper portions of the car guide rails. Tension from first and second suspending means that acts on first and second car rope fastening members is supported by the first and second side beams.