Hauling Pulley Sheave Segmented Coating Plates

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Solution Overview

Problem

The existing towing block sheaves used in fishing vessels face high operational costs and downtime due to the wear and tear of adhesive coatings, which require frequent replacement, disrupting the fishing process.

Innovation Solution

A towing pulley sheave design featuring removable and replaceable elastomeric coating plates distributed around the circumference of the sheave's groove, allowing for individual plate replacement without disassembling the entire system, ensuring continuous operation and reduced maintenance costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a continuous adhesive coating is applied to the sheave groove to improve grip, then the grip of the fishing net or line on the sheave is improved, but the coating wears out and requires costly replacement that takes the sheave out of service

Engineering Contradiction:

Improvegrip reliabilityVSAvoiddowntime for coating replacement

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The continuous adhesive coating is segmented into multiple separate adhesive elements distributed around the groove circumference. This allows individual elements to be replaced independently when worn, rather than requiring complete coating replacement, thus reducing downtime and maintenance costs while maintaining grip reliability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The adhesive elements are designed as replaceable components that can be discarded when worn out and replaced with new elements. The supporting structure is recovered and retained, allowing selective replacement of only the worn adhesive portions, minimizing downtime and resource waste.

Inventive Principle:

Principle #34Discarding and recovering

2Reliability

If a continuous adhesive coating is applied to the sheave groove, then the grip of the fishing net or line is improved, but the maintenance cost increases due to complete coating replacement

Engineering Contradiction:

Improvegrip reliabilityVSAvoidmaintenance cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The coating system is divided into discrete adhesive elements that can be manufactured separately and replaced individually. This segmentation reduces maintenance costs by allowing replacement of only the worn elements rather than the entire coating system.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The adhesive elements are designed as inexpensive, replaceable components with limited service life. When worn, they are replaced with new elements while retaining the expensive supporting structure, thereby reducing overall maintenance costs.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Reliability

If cleats are distributed around the groove circumference as disclosed in prior art, then the grip is enhanced, but the device complexity increases compared to a simple groove

Engineering Contradiction:

Improvegrip enhancementVSAvoidgroove structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The grip-enhancing features are segmented into discrete adhesive elements rather than forming a continuous complex structure. This segmentation simplifies the overall device while maintaining grip enhancement capabilities.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The solution combines a simple groove structure with separate adhesive material elements to achieve grip enhancement. This composite approach avoids the complexity of integrating complex mechanical features into the groove itself.

Inventive Principle:

Principle #40Composite materials

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

Facilitates the operation of the towing pulley by enabling on-site replacement of worn-out coating plates during fishing campaigns, reducing operational costs and maintaining the sheave's availability, thus enhancing operational efficiency and cost-effectiveness.

Implementation Method 1

The sheave can be coated with an adhesive material that fills its groove... to improve the grip of the fishing net or line on the sheave

Methodology Applied

Scientific EffectFriction: Friction

Implementation Method 2

The coating is applied to the sheave's groove and polymerized to form a continuous coating that completely covers the groove

Methodology Applied

Scientific EffectPolymerization: Photopolymerisation

Data Source

PatentEP3172962B1Hauling pulley sheave including lining plates, hauling pulley having such sheave and lining plate for such sheave

Publication Date: 2020.09.16 ETAB BOPP TREUILS JEB

Figure 1
Figure 2

AI summary

The sheave (6) of a hauling pulley (2) is designed for hauling up a fishing line or net. The sheave (6) comprises a rim (12) having around its circumference an annular groove (14) delimited by two lateral surfaces (16), and a wear-resistant coating disposed on the lateral surfaces (16) of the groove (14). The coating is formed of coating plates disposed on the lateral surfaces (16) of the groove (14), each lateral surface (16) of the groove (14) being covered by several coating plates distributed around the circumference of the rim (12), each coating plate extending over a fraction of the circumference of the rim (12).