Pipe Fusion Heater Indexing and Stripping for Hands-Free Removal

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Solution Overview

Problem

There is a need for an improved apparatus and method for automatically stripping the molten ends of pipe sections from the heater and then removing the heater from the fusion zone after the heating operation is completed, while also ensuring adaptability to various pipe sizes and maintaining reliability and repeatability.

Innovation Solution

The proposed solution involves a pipe fusion apparatus with an indexer carriage that carries a facer and a heater, which are pivotable into and out of the fusion zone. The apparatus includes a heater stripping mechanism, a latch release mechanism, and a brake assembly to manage the movement and positioning of the heater. Additionally, a heater retention mechanism allows the operator to retain the heater at intermediate positions for maintenance or inspection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If manual heater removal is used, then operator control is maintained, but operator fatigue increases and efficiency decreases

Engineering Contradiction:

Improveoperational efficiencyVSAvoidoperator fatigue

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

The heater retention mechanism enables automatic heater removal through indexing motion. The mechanism uses the carriage's own indexing movement to automatically engage or disengage the heater retention arm from the heater, eliminating the need for manual operator intervention and reducing fatigue while maintaining control.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The heater retention arm is pre-positioned in engagement with the heater before indexing occurs. The indexing mechanism then automatically performs the removal action as part of its predetermined sequence, allowing the system to prepare for and execute heater removal without requiring real-time manual decisions.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If automated heater stripping is implemented, then operational efficiency improves, but device complexity increases

Engineering Contradiction:

Improveautomated heater removalVSAvoidmechanism complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The heater retention mechanism serves multiple functions: it retains the heater during indexing, enables automatic removal, and can be disengaged for manual operations. This multi-functionality reduces the need for separate dedicated components for each function, thereby limiting the increase in overall device complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The heater retention arm transitions between engaged and disengaged states dynamically based on operational needs. The mechanism uses the existing indexing motion to automatically transition the retention arm between states, leveraging the dynamic movement already present in the system rather than adding static complex locking mechanisms.

Inventive Principle:

Principle #15Dynamics

3Ease of repair

If heater retention at intermediate positions is allowed, then maintenance access improves, but positioning precision challenges arise

Engineering Contradiction:

Improvemaintenance accessVSAvoidpositioning accuracy

Core Design Contradiction:

Ease of repairVSManufacturing precision

Solution Approach 1:

The mechanism replaces complex electronic positioning systems with a simple mechanical indexing approach. The heater retention arm uses mechanical engagement with the heater at predetermined indexing positions, providing sufficient precision for maintenance operations without requiring sophisticated electronic control or high-precision manufacturing.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 enables automatic and efficient removal of the heater from the molten ends of the pipe sections and from the fusion zone, improving operational efficiency and reducing operator fatigue. It also ensures adaptability to different pipe sizes and maintains high reliability and repeatability, while allowing for easier maintenance and access to components.

Implementation Method 1

heating the adjacent ends of the pipe sections to a prescribed fusion temperature for a period of time

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

a hydraulic power system which provides the force necessary for pressing the molten ends of the pipe sections together during the fusion process

Methodology Applied

Scientific EffectHydraulic pressure: Hydraulic Press

Data Source

PatentUS20250115007A1Pipe fusion apparatus and method, and indexer, stripper, brake, and heater retention mechanism therefor

Publication Date: 2025.04.10 MCELROY MANUFACTURING INC

AI summary

A pipe fusion apparatus and method which (a) provide an indexer carriage for the facer and heater and a brake which automatically holds the indexer at predetermined locations, (b) operate to automatically strip the heater from the molten ends of the pipe, (c) also operate to automatically return the heater to its retracted position, and (d) provide a heater retention mechanism for holding the heater at desired downward intermediate positions, so that the operator will have both hands free for cleaning or taking temperature readings, without interfering with the subsequent return of the heater from the fusion zone to the fully retracted position of the heater.