Thermoplastic Pipe Butt Welding with Integrated Heating and Planing
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Solution Overview
Problem
Existing butt welding methods for plastic pipes result in large beads that impair pipe flow and require long process times, complex control systems, and unnecessary energy expenditure.
Innovation Solution
The method involves planning pipe overhangs to a defined length using mechanical stops or a position measuring system, adjusting the heating mirror temperature to ambient temperature, and integrating a minimal length allowance for optimal heat transfer, eliminating the need for a separate adjustment phase and reducing bead size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional butt welding method is used with separate adjustment phase, then welding process is reliable, but process time is long and energy consumption is high
Solution Approach 1:
The patent combines the adjustment phase and heating phase into a single integrated heating phase. The heating mirror simultaneously performs both the adjustment function (bringing pipe ends to correct position) and heating function (melting the plastic material), eliminating the need for a separate adjustment phase and reducing total process time while maintaining welding reliability
Solution Approach 2:
The pipe ends are planed to a precisely defined length before the welding process begins. This preliminary preparation ensures that when the heating phase starts, the pipe ends are already at the correct position and length, allowing the heating mirror to immediately perform both adjustment and heating functions without requiring a separate adjustment phase
2Reliability
If conventional butt welding method is used with separate adjustment phase, then welding process is reliable, but energy consumption is high
Solution Approach 1:
The patent combines the adjustment phase and heating phase into a single integrated heating phase. The heating mirror simultaneously performs both the adjustment function (bringing pipe ends to correct position) and heating function (melting the plastic material), eliminating the need for a separate adjustment phase and reducing total process time while maintaining welding reliability
Solution Approach 2:
The heating mirror continuously performs useful work throughout the entire heating phase by simultaneously adjusting the pipe ends to correct position and heating them for welding. This continuous useful action eliminates idle time and energy waste associated with separate phases, reducing overall energy consumption while maintaining process reliability
3Ease of manufacture
If conventional butt welding method is used, then welding process is simple, but bead size is large impairing pipe flow
Solution Approach 1:
The patent changes the critical parameter of pipe end length by planing the pipes to a precisely defined length before welding. This parameter change ensures that when the heating mirror heats and melts the plastic, the resulting bead is minimized in size, improving pipe flow characteristics while maintaining the simplicity of the welding process
Solution Approach 2:
The pipe ends are planed to a defined length that is slightly longer than the final required length, providing a small allowance. During the heating phase, the heating mirror melts and removes this excess material, forming minimal beads. This partial removal of material achieves the desired effect of small beads while keeping the process simple
4Manufacturing precision
If mechanical stops are used for planing pipe overhangs, then positioning precision is high, but device complexity increases
Solution Approach 1:
The patent uses simple, inexpensive mechanical stops made of basic materials to define the planing length. These stops are straightforward mechanical components that require no complex control systems, sensors, or electronics, providing high positioning precision through simple mechanical means while keeping device complexity low
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 minimizes energy consumption, shortens welding time, and ensures optimized pipe flow with minimal bulge formation, achieving efficient and cost-effective welding without complex control systems or sensors.
Implementation Method 1
The plastic pipes are clamped in the clamping points provided for this purpose, with the opposite pipe ends protruding from the clamping points and all damage and dirt are removed by the planer located between the two pipe ends
Implementation Method 2
a heating mirror which can be fitted instead of the planer, are heated by touching the heating mirror, with the heating of the free pipe ends to be welded producing a melting area
Implementation Method 3
heating of the free pipe ends to be welded producing a melting area which forms a bulge when pressed
Data Source
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AI summary
The method involves arranging pipes coaxial to each other by clamping points, and planing the pipes by a planer arranged between the clamping points. The pipes are heated by a heating mirror that is arranged at the planer, and a transition section is produced by heating ends of the pipes, where the transition section forms a bulge during pressing process. A projection of the pipes is planed to a defined mass, and heating temperature of the heating mirror is adjusted according to ambient temperature, where the heating mirror comprises heating stoppers. An independent claim is also included for a device for welding pipes made from a thermoplastic material.