Elevator Sprocket Chain Transmission and Open Hatchway
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Solution Overview
Problem
Conventional steel wire rope elevators face issues with high construction costs, complex structures, safety concerns due to slipping, and difficulties in adding outdoor elevators to multi-story buildings due to enclosed hatchways affecting daylighting and ventilation.
Innovation Solution
An elevator design utilizing sprocket and chain transmission with an open hatchway structure and hidden counterbalancing, featuring a steel frame structure, motor speed reducer with frequency converter and encoder, and counterweights connected through steel wire ropes and guide wheels, allowing for precise control and reduced space occupancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If steel wire rope transmission is used for elevator, then power transmission function is achieved, but structure becomes complex and construction cost increases
Solution Approach 1:
The patent replaces the conventional steel wire rope friction transmission system with a sprocket and chain mechanical transmission system. The chain drives the sprocket on the traction wheel, which in turn drives the car. This substitution simplifies the overall structure by eliminating the need for multiple steel wire ropes and complex friction control mechanisms, while maintaining reliable power transmission.
2Ease of operation
If steel wire rope friction transmission is used for car, then car can be driven, but slipping occurs causing safety issues
Solution Approach 1:
The patent replaces the friction-based steel wire rope transmission with a positive mechanical engagement system using chains and sprockets. The chain engages with the sprocket teeth, providing reliable power transmission without slipping. This mechanical engagement ensures that the car is reliably driven regardless of load conditions, eliminating the safety hazards associated with friction transmission.
3Reliability
If enclosed hatchway structure is used for outdoor elevator, then safety is improved, but daylighting and ventilation of residents are affected
Solution Approach 1:
The patent divides the hatchway into multiple segments with open spaces between them, creating an open hatchway structure. This segmentation allows light and air to pass through while maintaining the structural integrity and safety functions of the hatchway. The open design enables daylighting and ventilation for residents while preserving the safety advantages of an enclosed structure.
4Force
If fixed counterweight is used for load balancing, then partial weight balancing is achieved, but energy consumption increases when fully or lightly loaded
Solution Approach 1:
The patent implements a dynamic counterweight system where the counterweight can move along the guide rails to adjust its position. The counterweight is connected to the car through a cable system that allows it to shift position based on load conditions. This dynamic adjustment enables optimal weight balancing across different load scenarios, reducing energy consumption compared to fixed counterweight 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
The solution provides a safer, more controllable, and cost-effective elevator system with reduced impact on ventilation and daylighting, enabling easier installation and acceptance for outdoor installations in multi-story buildings, while minimizing slipping risks and enhancing safety features.
Implementation Method 1
a motor speed reducer (or servo motor) equipped with a frequency converter and an encoder, where the frequency converter and the encoder are used for changing a rotational speed of a motor to control an ascending or descending speed of the elevator
Implementation Method 2
two sprockets and two chains connected to the two output shafts are disposed in the power device, and the two output shafts are driven by the motor to work simultaneously, so that the two output shafts simultaneously drive the two chains and the two sprockets to drive the car and the counterweights to move up or down
Implementation Method 3
the counterweights are connected to the car through the steel wire ropes and the guide wheels, and used for balancing the car and a part of a weight of a load
Implementation Method 4
the counterweights are connected to the car through the steel wire ropes and the guide wheels
Data Source
AI summary
An elevator and an elevator control method are provided. The elevator includes a car (4) and counterweights (10); the elevator includes posts (2), a steel frame structure (13), and a power device (7), where the steel frame structure (13) is fixed on the top of the elevator, and the power device (7) is fixedly installed on the steel frame structure (13); and the counterweights (10) are disposed in the posts (2).