Double Drum Traction Winch Adjustable Grooves
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Solution Overview
Problem
Double drum traction winches experience significant wire slippage due to wire elongation, leading to increased wear and heat generation, particularly problematic with high-tech synthetic wires that are more susceptible to heat damage.
Innovation Solution
The winch features adjustable grooves on both drums, achieved through a mechanism of movable curved segments and actuators that adjust the groove circumference to match the changing length of the wire, reducing or eliminating slippage by ensuring a better fit throughout the wire's length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed grooves are used on the drums, then the winch structure is simple and easy to manufacture, but the wire slips due to elongation under load causing increased wear and heat generation
Solution Approach 1:
The grooves are made dynamically adjustable through curved segments that can move radially outward or inward to change the groove circumference. This dynamic adjustment allows the grooves to adapt to wire elongation under load, preventing slippage while maintaining a relatively simple overall structure.
Solution Approach 2:
The groove circumference parameter is made variable through the curved segments mechanism. By changing the radial position of curved segments, the groove circumference can be adjusted to match the wire length under different loading conditions, thereby maintaining reliable wire grip without excessive complexity.
2Reliability
If the groove circumference is increased to accommodate wire elongation, then wire slippage is reduced, but the drum diameter increases affecting winch compactness
Solution Approach 1:
The groove circumference is dynamically adjusted only when needed through curved segment movement, rather than being permanently enlarged. This allows the drum to maintain its compact size during normal operation while providing increased groove circumference when wire elongation occurs under load.
Solution Approach 2:
The groove is divided into multiple curved segments that can independently move radially. This segmentation allows the groove circumference to be increased locally and temporarily through segment displacement without permanently increasing the overall drum volume.
3Reliability
If curved segments are used to adjust groove circumference, then wire slippage is eliminated, but the manufacturing complexity and cost increase
Solution Approach 1:
The groove is segmented into multiple curved segments that can be manufactured as separate components and then assembled. This segmentation simplifies manufacturing compared to a monolithic adjustable groove, as each segment can be produced using standard drum manufacturing processes and then positioned as needed.
Solution Approach 2:
The curved segments are designed with simple radial movement capability, allowing them to be manufactured with basic machining operations. The dynamic adjustment function is achieved through straightforward radial positioning mechanisms rather than complex systems, maintaining ease of manufacture while providing reliable wire grip.
Data Source
AI summary
A double drum traction winch of which the rotatable drums are both provided with adjustable grooves is provided. Each drum includes multiple, for example three or more, curved segments, each segment defining a section of a circumferential groove, such that multiple circumferential grooves on the outer surface of the drum are each composed of several curved segments. The curved segments are each movably supported by a core body for movement in a substantial radial direction relative to the rotational axis of the drum. An actuator mechanism for the curved segments is provided, that includes actuators that cause essentially radial displacement of the curved segments, such that the circumference of the grooves can be adjusted.