Intermediate Welding Device for One-Step Coaxial Plastic Pipe Joining
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Solution Overview
Problem
The welding of coaxial plastic pipe structures is complicated by increased cross-sections and requires multiple manual steps, including shortening or cutting pipe ends, which complicates the process and reduces reliability.
Innovation Solution
An intermediate welding device with circumferentially closed inner and outer heating elements that heat the pipes via thermal conduction, allowing for one-step welding without prior preparation of the pipe ends, using either resistance wire coils or induction weldable layers to facilitate the welding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional welding methods are used for coaxial plastic pipes, then the pipes can be welded together, but the process requires multiple manual steps including cutting and shortening pipe ends, increasing device complexity and reducing productivity
Solution Approach 1:
The patent combines multiple welding operations (inner pipe welding and outer pipe welding) into a single integrated welding device that can weld both pipes simultaneously in one step, eliminating the need for separate cutting and welding operations for each pipe
Solution Approach 2:
The patent introduces an intermediate welding device that acts as a mediator between the inner and outer pipes, providing a unified heating and welding mechanism that coordinates both welding operations simultaneously, thereby simplifying the overall welding process
2Reliability
If traditional welding methods are used for coaxial plastic pipes, then the pipes can be welded together, but manual preparation steps are required, reducing productivity
Solution Approach 1:
The welding device incorporates preliminary positioning features such as stop flanges and guiding structures that automatically position the pipes correctly before welding begins, eliminating manual preparation steps and enabling immediate welding operation
Solution Approach 2:
The device merges pipe positioning, heating, and welding functions into a single integrated system that performs all operations in one step, significantly improving productivity by eliminating sequential manual preparation steps
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
Enables reliable one-step welding of coaxial plastic pipe structures without prior end preparation, improving efficiency and reducing manual labor, while ensuring a strong and leak-tight connection.
Implementation Method 1
a circumferentially closed inner heating element (6b) arranged in order to heat the inner side (4) by thermal conduction
Implementation Method 2
a circumferentially closed outer heating element (6a) arranged in order to heat the outer side (2) by thermal conduction
Implementation Method 3
a voltage can be applied to the coils, which generates heat in the coils and the material surrounding the coils, by heat conduction
Data Source
Figure 1~4
Figure 5~6
Figure 7~8b
AI summary
An intermediate welding device for use when welding together two ends of a coaxial plastic pipe structure having at least an innermost pipe (22, 22') and an intermediate pipe (24, 24'), in one step. The intermediate welding device (1, 1') comprises a hollow section (9) having an inner side (4) configured to receive the innermost pipe (22, 22') with a tight fit and an outer side (2). The intermediate welding device further comprises a circumferentially closed inner heating element (6b, 6b') arranged in order to heat the inner side (4) by thermal conduction, whereby the intermediate welding device further comprises a circumferentially closed outer heating element (6a, 6a') arranged in order to heat the outer side (4) by thermal conduction, which is configured to glide into the intermediate pipe (24, 24') with a tight fit.