Pneumatic Swing Gate Drive With Helical Cam Conversion
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Solution Overview
Problem
Existing fare gates with pneumatic drive mechanisms are prone to fare evasion due to their design, and the transition to electrically driven swing gates has resulted in reliability issues and increased costs, despite pneumatic systems being more durable and reliable.
Innovation Solution
A pneumatic drive mechanism that converts linear motion to rotational motion using a three-position linear actuator, spline shaft, cam followers, and a helical cam shaft, allowing for the retrofitting of existing fare gates to swing barrier types, utilizing compressed air for operation and integration with PID control for precise control and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If swing barrier design is implemented to prevent fare evasion, then security and anti-fare-evasion capability are improved, but device complexity increases due to requiring electric motors instead of pneumatic drivers
Solution Approach 1:
The patent applies pneumatic principles by using compressed air to drive the swing barrier gate through a pneumatic actuator. The actuator converts pneumatic pressure into rotational motion, eliminating the need for electric motors while maintaining the swing barrier configuration. This resolves the contradiction by preserving the anti-fare-evasion benefits of swing barriers while simplifying the drive mechanism to use reliable pneumatic components already present in the system.
2Ease of operation
If electric motors are used to drive swing barriers, then barrier motion control is improved, but reliability deteriorates due to historical problems with electric drivers
Solution Approach 1:
The pneumatic actuator is integrated with the existing compressed air infrastructure, allowing the system to use its own available resources (compressed air supply) to drive the barrier. This eliminates dependence on external electric power systems and their associated reliability issues. The pneumatic system leverages the facility's existing utilities, making the barrier operation self-sufficient and highly reliable.
3Adaptability or versatility
If electric driven fare gates are installed to improve barrier functionality, then barrier design flexibility is improved, but cost increases due to installation and maintenance expenses
Solution Approach 1:
The pneumatic actuator serves multiple functions: it drives the swing barrier, provides controlled motion, and integrates with the existing compressed air system. This multi-functionality eliminates the need for separate electric motor installations and reduces maintenance requirements. The solution maintains design flexibility while reducing costs by utilizing the existing pneumatic infrastructure for which the facility is already equipped.
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 solution provides a reliable, maintainable, and cost-effective means to convert existing fare gates to swing barriers, enhancing security and reducing fare evasion while leveraging existing infrastructure, offering a scalable and high-performance solution for fare gate operation.
Implementation Method 1
a pneumatic drive mechanism which converts linear shaft motion to rotational shaft motion along a common axis when compressed air is applied to a three-position linear actuator
Implementation Method 2
The Cam-Followers are guided by a helical cam shaft that is supported by bearings and is free to rotate around a common axis as the cam-followers travel up and down along the common axis
Data Source
AI summary
A pneumatic drive mechanism for converting linear motion from compressed air into rotational motion for use in fare gates and other applications.