Dryer Drum Welding via External Automated Stations

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Solution Overview

Problem

Existing methods for manufacturing dryer drums require operators to work in confined, non-ergonomic conditions for extended periods, exposing them to welding fumes and increasing the risk of errors due to manual welding inside a cylindrical drum.

Innovation Solution

The method involves assembling the drum's internal supports with provisional fixings that allow for external automated welding, reducing operator time inside the drum and improving welding quality by using passing-through seats and external welding stations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If operators manually weld supports inside the drum, then the supports can be fixed to the internal surface, but the operators are exposed to welding fumes and work in non-ergonomic conditions for extended periods

Engineering Contradiction:

Improvewelding qualityVSAvoidoperator exposure to welding fumes

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

Instead of welding from inside the drum, the method inverts the approach by welding from outside. Supports are provisionally fixed inside the drum, then the drum is rotated to bring external welding stations into position, allowing automated welding to occur from the external side. This eliminates operator exposure to fumes while maintaining weld quality.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent introduces provisional fixings as an intermediary element that enables the transition from internal to external welding. These fixings temporarily hold supports in position during rotation, allowing external automated welding stations to access and complete the welding process without direct operator presence inside the drum.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If operators manually weld supports inside the drum, then the supports can be fixed to the internal surface, but the manufacturing time is increased due to the complexity of the process

Engineering Contradiction:

Improvewelding qualityVSAvoidmanufacturing time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The drum itself performs the work of bringing welding stations to the supports through automated rotation. The rotating drum mechanism automatically positions external welding stations at each support location, eliminating the need for operators to manually position themselves and their equipment inside the confined drum space.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces manual mechanical welding operations with automated welding systems. External automated welding stations, controlled by the drum's rotation mechanism, perform the welding task without human intervention inside the drum, significantly reducing manufacturing time while maintaining or improving weld quality.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of manufacture

If operators manually weld supports inside the drum, then the supports can be fixed to the internal surface, but the risk of welding errors increases due to difficult working conditions

Engineering Contradiction:

Improveease of welding operationVSAvoidwelding accuracy

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

Manual welding operations are replaced with automated welding systems positioned outside the drum. The automated stations, guided by the drum's rotation, provide consistent positioning and welding parameters, eliminating human error factors such as fatigue, improper positioning, and inconsistent welding techniques that plague manual operations in confined spaces.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Extent of automation

If the drum is rotated to bring welding stations to supports, then external automated welding can be performed, but the drum structure must accommodate passing-through seats

Engineering Contradiction:

Improveautomated weldingVSAvoiddrum structure complexity

Core Design Contradiction:

Extent of automationVSDevice complexity

Solution Approach 1:

The drum structure is segmented with discrete passing-through seats at specific locations rather than being a continuous solid structure. These segmented openings allow welding stations to access supports from the external side while maintaining the structural integrity of the drum between seat locations. The segmentation approach minimizes structural complexity compared to redesigning the entire drum architecture.

Inventive Principle:

Principle #1Segmentation

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 approach significantly reduces manufacturing time, minimizes operator exposure to hazardous fumes, and enhances the reliability and quality of welds, leading to a more efficient and safer production process.

Implementation Method 1

a burner which generates a flame extending inside the cylinder

Methodology Applied

Scientific EffectEvaporation: Evaporation

Implementation Method 2

the burner generates a flame extending inside the cylinder

Methodology Applied

Scientific EffectHeating: Heating

Data Source

PatentEP3386672B1Drum for a dryer and method of manufacturing a drum for a dryer for conglomerates

Publication Date: 2020.02.12 MARINI SPA

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AI summary

The present application relates to a drum (1) of a dryer and a method of manufacturing a drum (1) of a dryer for the drying of materials in the form of conglomerates, wherein the drum (1) comprises blades for making the material advance inside the drum (1), which are fixed to the drum (1) by means of supports welded to the drum (1) itself.