Roller-Drum Molding Apparatus for Continuous Pre-Insulated Pipe Production
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Solution Overview
Problem
Existing continuous processes for producing pre-insulated piping systems are overly complex and expensive, requiring multiple molding devices for different pipe diameters and being inefficient in throughput due to the use of complicated 'corrugator'-style molding apparatuses.
Innovation Solution
A simpler 'roller-drum' molding apparatus is introduced, featuring a cylindrical body with linearly staggered and offset circular arrays of rollers that provide 100% coverage for the foam, allowing continuous injection and curing of foaming material around the pipe, replacing the complex 'corrugator' systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If complex 'corrugator'-style molding apparatuses are used for continuous production, then pre-insulated piping can be produced continuously, but the device complexity and production cost increase significantly
Solution Approach 1:
The molding apparatus is divided into multiple independent heating zones along the length of the mold, with each zone having its own heating elements and temperature control. This segmentation allows different sections of the foam insulation to be cured at different rates, managing the expansion process more effectively while using simpler overall apparatus design
Solution Approach 2:
The molding apparatus uses movable supports and adjustable positioning mechanisms that can adapt to different pipe diameters and foam expansion rates. The apparatus transitions from a static complex corrugator design to a dynamic system that can adjust during the foaming process, reducing overall complexity while maintaining continuous production capability
2Adaptability or versatility
If multiple molding devices are used to accommodate different pipe diameters, then various pipe sizes can be produced, but the device complexity and cost increase
Solution Approach 1:
The molding apparatus is designed as a universal device that can accommodate multiple pipe diameters through adjustable supports, movable components, and scalable heating zones. A single apparatus performs the function of what would traditionally require multiple specialized molds, reducing overall system complexity while maintaining versatility
Solution Approach 2:
The apparatus incorporates dynamic adjustment capabilities including movable mold sections and adjustable positioning mechanisms that allow the same device to adapt to different pipe sizes. This dynamic adaptability replaces the need for multiple static molding devices
3Productivity
If complicated molding apparatuses are used, then continuous production is achieved, but maintenance difficulty and production cost increase
Solution Approach 1:
The heating system is divided into separate, modular heating zones that can be independently maintained or replaced. If one heating zone requires maintenance, others continue operating, and the modular design simplifies repair procedures compared to a monolithic complex apparatus
Solution Approach 2:
The apparatus incorporates self-regulating temperature control systems and automatic monitoring that reduce the need for complex manual intervention during maintenance. The system can detect and compensate for certain issues automatically, simplifying maintenance requirements while maintaining continuous production
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 reduces production costs, simplifies maintenance, and enables the production of pre-insulated pipes of various diameters with improved efficiency and throughput, providing a more economical and efficient continuous process for producing pre-insulated piping systems.
Implementation Method 1
a foaming material is injected into the annular region between the pipe exterior and the film interior as the pipe moves through the molding apparatus
Implementation Method 2
The foaming material is continuously molded to a substantially uniform radial thickness and cured to form a foam insulated pipe
Implementation Method 3
A plurality of individual rollers are arranged in a series of linearly staggered, circular roller arrays... The foaming material is continuously molded to a substantially uniform radial thickness
Implementation Method 4
Around the outside of the foam is a thin jacket of thermoplastic material... the insulating foam serves to keep heat loss from the starting location of the pipeline to the ending location at a minimum
Data Source
AI summary
A method for the continuous production of pre-insulated piping having an inner metal carrier pipe having an interior surface and an exterior surface and an envelope of foamed insulation surrounding the inner metal carrier pipe exterior surface. A molding apparatus is provided for forming an annulus about a pipe to be insulated into which foam can be injected. The pipe is continuously moved through the apparatus with foaming material being injected into the annulus where it is molded and cured to form a foam insulated pipe. The molding apparatus is a roller-drum having a cylindrical length and a plurality of individual rollers arranged in a series of linearly staggered, circular arrays which define the annulus where the foaming material is cured.