Pipe Peeler Mandrel Design for Tight Tapping Tee Clearance
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Solution Overview
Problem
Conventional devices for removing a thin layer from the outer surface of plastic pipes and tapping tees are inadequate, particularly due to large swing radii that cannot be used on tapping tee outlets with limited clearance, which is a prerequisite for ensuring cleanliness and preventing leaks in electrofusion welding.
Innovation Solution
A peeler device with a main body and mandrel design, where the pipe is pushed onto the mandrel and rotated to advance a blade that peels a thin layer off the outer surface, allowing for precise removal of approximately 0.009″ to 0.012″, with a spring-loaded blade lever for easy operation and visual confirmation of completion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional devices with large swing radius are used, then they can remove a thin layer from plastic pipes, but they cannot be used on tapping tee outlets with limited clearance
Solution Approach 1:
The device is divided into a main body and a separate mandrel component. The mandrel can be detached and replaced based on the specific pipe diameter, allowing the device to adapt to different pipe configurations including tapping tee outlets with limited clearance, while the main body housing contains the peeling mechanism.
Solution Approach 2:
The mandrel is designed to be inserted into the main body housing, creating a nested structure. This allows the device to maintain a compact overall size while accommodating different mandrel sizes for various pipe diameters, effectively reducing the swing radius needed for operation in confined spaces.
2Manufacturing precision
If the blade is advanced to peel a thin layer, then the outer surface is cleaned, but precise control of the removed layer thickness is required
Solution Approach 1:
The mandrel is pre-configured with a specific diameter that corresponds to the desired final pipe outer diameter after peeling. By pushing the pipe onto the pre-sized mandrel and rotating the main body, the blade automatically advances to remove precisely the amount of material needed to achieve the target diameter, eliminating the need for complex real-time thickness control during operation.
Solution Approach 2:
The device uses the pipe itself as a guide and measurement reference. As the pipe is rotated against the fixed mandrel, the blade naturally removes material until the pipe outer surface contacts the mandrel surface, automatically achieving the correct thickness removal without requiring external measurement or complex control mechanisms.
Data Source
AI summary
A peeler device removes a thin layer from the outer surface of the end of a plastic pipe or tapping tee. In the preferred embodiments, the device has a main body and a mandrel. The pipe to be peeled is pushed onto the mandrel when the mandrel is in an out position. As the main body is rotated, a blade advances onto the plastic pipe and peels a thin layer off the outer surface of the pipe as it is advanced. The main body is rotated until peeling is complete. There may be a sight window in the main body to permit visual confirmation of when peeling is complete. A spring loaded blade lever is actuated to raise the blade and the pipe is pulled out of the main body.