Compact Tensioning Device for Overhead Wire Masts
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wheel tensioners for overhead contact line systems occupy a large space due to the relatively large diameter of one of the tensioning drums, making it impossible to integrate them into slim catenary masts and affecting the external appearance of the masts.
Innovation Solution
The device features tensioning drums connected by a gear with a specified transmission ratio, allowing for a compact design where one drum does not need a large diameter, and includes a locking mechanism to prevent damage when the cable breaks, with a chain transmission and a pivoting frame to lock the drums.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If one tensioning drum has a relatively large diameter to reduce the weight of the tensioning weight, then the weight of the tensioning weight is reduced, but the device occupies a large amount of space
Solution Approach 1:
The patent transitions from a single-drum design to a multi-drum arrangement with different diameters (first drum with larger diameter, second drum with smaller diameter), utilizing dimensional variation to distribute functions across multiple components. This allows the system to achieve the same weight reduction effect while reducing the overall space occupation by not requiring one excessively large drum.
Solution Approach 2:
The tensioning function is segmented into multiple drums with different diameters rather than using a single large drum. The first tensioning drum and second tensioning drum are arranged with different diameters to share the load, allowing weight reduction without requiring one drum to be excessively large, thus reducing overall device volume.
2Weight of moving object
If one tensioning drum has a relatively large diameter to reduce the weight of the tensioning weight, then the weight of the tensioning weight is reduced, but the external appearance of the catenary mast is significantly affected
Solution Approach 1:
By using multiple drums with different diameters arranged in a compact configuration, the patent achieves weight reduction without creating a single large protruding component. The varied diameters allow for a more compact overall shape that integrates better with the mast structure.
Solution Approach 2:
The patent employs asymmetric drum diameters (first drum larger than second drum) to optimize the weight distribution and spatial arrangement. This asymmetric configuration allows the heavier first drum to be positioned where it provides maximum benefit while the smaller second drum reduces overall profile, creating a more aesthetically pleasing integration with the mast.
3Volume of moving object
If the tensioning device is designed with a compact structure to integrate into slim catenary masts, then the space occupation is reduced, but the transmission mechanism becomes more complex
Solution Approach 1:
The patent introduces a transmission mechanism as an intermediary component that connects the first and second tensioning drums. This mediator transfers rotational motion and force between the drums of different diameters, enabling the compact multi-drum configuration to function as an integrated system while maintaining the space-saving benefits.
Solution Approach 2:
The patent combines multiple tensioning drums with different diameters into a single integrated wheel tensioner assembly. By merging these components and connecting them through a transmission mechanism, the system achieves a compact structure that fits into slim catenary masts while distributing the tensioning function across multiple integrated parts.
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 compact tensioning device can be seamlessly integrated into the mast head without affecting the mast's appearance, and the locking mechanism prevents further damage when the cable breaks, ensuring the tensioning weight does not fall.
Implementation Method 1
the first tensioning drum and the second tensioning drum are connected to a gear, with the axes of the first and second tensioning drums being spaced apart from one another, wherein due to the gear, with which the required transmission ratio is specified
Implementation Method 2
In a preferred embodiment, the transmission is a traction mechanism, preferably a chain transmission
Implementation Method 3
The tensioning weight is used to apply the required tensile force to the contact wire or the carrying cable
Data Source
AI summary
The device (1) has a tensioning arrangement comprising a tensioning drum (5) for receiving an anchoring wire connected with a contact wire or a bearer cable, and another tensioning drum (6) for receiving a weight connected with a retightening weight. The tensioning arrangement is arranged in a housing (2). The drums are connected with a chain drive for reducing weight of the retightening weight. Axles of the drums are arranged at distance from each other. Diameters of the drums are equal to each other. The drums are rotatably supported at a frame (3).