Motor-Driven PEX Expansion Tool for One-Second Mandrel Cycles
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Solution Overview
Problem
Existing PEX tubing expansion tools lack efficiency in expanding PEX tubing quickly and consistently for fitting insertion, with most tools requiring manual effort and taking longer than desired to complete the expansion cycle.
Innovation Solution
A motor-driven expansion tool with a mandrel and drive mechanism that converts rotational input into translational movement, enabling rapid cycles of extending and retracting the mandrel to expand and contract the working element, achieving a cycle time of one second or less, and utilizing a controller to manage motor operation for efficient expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual expansion tools are used, then device complexity is reduced, but productivity decreases due to longer expansion cycle times
Solution Approach 1:
The patent replaces manual mechanical expansion tools with a motor-driven system that automatically controls the mandrel's reciprocating motion. The motor converts rotational motion to linear reciprocating motion through a drive mechanism, eliminating the need for manual operation and significantly reducing expansion cycle time while maintaining manageable device complexity through standardized motor and transmission components.
Solution Approach 2:
The patent implements dynamic reciprocating motion of the mandrel, transitioning from static or manually-controlled positions to automated oscillating movement between extended and retracted positions. This dynamic operation allows rapid expansion cycles by continuously moving the mandrel forward to expand the tubing and backward to reset, achieving high-speed repetitive operation.
2Productivity
If rapid expansion cycles are implemented, then productivity increases, but manufacturing precision may deteriorate due to reduced expansion time
Solution Approach 1:
The patent incorporates a controller that monitors and regulates the motor's operation, ensuring consistent reciprocating motion parameters (speed, stroke length, frequency) throughout each expansion cycle. This feedback control maintains uniform expansion quality across rapid cycles by preventing variations in mandrel position and pressure that could compromise expansion consistency.
Solution Approach 2:
The patent ensures continuous effective expansion action through uninterrupted reciprocating mandrel motion. The drive mechanism maintains constant engagement with the mandrel throughout the expansion cycle, eliminating idle periods or inconsistent force application that could occur with intermittent or manually-controlled operation, thereby ensuring uniform expansion results even at high speeds.
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
The tool enables rapid and consistent expansion of PEX tubing, allowing for quicker fitting insertion and secure connection, minimizing the time required to fully expand the tubing and ensuring a tight, elastic recovery around the fitting.
Implementation Method 1
The PEX tube elastically recovers around the fitting to form a tight connection
Implementation Method 2
a drive mechanism configured to convert a rotational input from the motor into translational movement of the mandrel
Data Source
AI summary
An expansion tool includes a housing, a motor supported by the housing, a mandrel, and a drive mechanism configured to convert a rotational input from the motor into translational movement of the mandrel between an extended position and a retracted position. The expansion tool is configured to perform cycles of axially extending and retracting the mandrel. An elapsed time for one cycle of moving the mandrel from the retracted position to the extended position and back to the retracted position defines a cycle time of the expansion tool. The cycle time is one second or less.