Floating Cutting Mandrel Positioning via Magnetic Coupling
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Solution Overview
Problem
Existing pipe cutting machines require extensive time and are prone to positioning errors due to the use of long holding rods, which are susceptible to temperature changes and sagging, making precise alignment of the cutting mandrel challenging.
Innovation Solution
A pipe cutting machine utilizing a magnetic coupling with a floating cutting mandrel and a position sensor to accurately position the mandrel within the pipe, eliminating the need for mechanical rods and allowing for precise alignment through controlled magnetic forces and feedback from Hall effect sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a long holding rod is used to position the cutting mandrel through the pipe, then the mandrel can be positioned from the feeding side, but the positioning time increases and positioning precision deteriorates due to temperature-dependent elongation and sagging
Solution Approach 1:
The patent replaces the mechanical holding rod system with a magnetic field-based positioning system. The magnetic coupling between the cutting mandrel and the pipe enables precise positioning without mechanical contact, eliminating the problems of rod elongation and sagging while reducing positioning time.
Solution Approach 2:
The patent changes the physical state used for positioning from mechanical (rod-based) to magnetic field-based. By utilizing magnetic field strength and coupling characteristics, the system achieves precise mandrel positioning without the physical constraints of long rods, thereby improving both precision and speed.
2Length of moving object
If the holding rod is made long to reach through the entire pipe, then positioning from the feeding side is possible, but the rod becomes susceptible to temperature changes and sagging
Solution Approach 1:
The patent eliminates the mechanical holding rod entirely and replaces it with a magnetic field-based positioning system. The magnetic coupling provides reliable positioning without the physical constraints and vulnerabilities of long rods, including temperature-dependent elongation and gravitational sagging.
3Loss of time
If the mandrel is fastened from the cutting side, then positioning time is reduced, but the mandrel must be moved away and opened for removal of pipe sections
Solution Approach 1:
The magnetic positioning system allows the mandrel to be quickly positioned and released without mechanical fastening or unfastening operations. The magnetic coupling can be engaged and disengaged rapidly, eliminating the need to move away and open the mandrel for pipe section removal, thus improving both positioning time and operational ease.
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 significantly reduces the time required for mandrel positioning and enhances precision by using a magnetic coupling and position sensor to maintain accurate alignment of the cutting mandrel, minimizing errors and improving the efficiency of the cutting process.
Implementation Method 1
a magnetic coupling (6) is provided with a coupling stator (7) arranged outside the pipe (3) and a coupling rotor (21) which is arranged on the stationary mandrel (14) and interacts with the coupling stator (7)
Implementation Method 2
feedback from Hall effect sensors
Data Source
AI summary
A pipe cutting machine with a pipe (3), from which a pipe section (3a) is to be cut to size, a stationary cutting die (1), a movable cutting die (2) which can be moved relative to the stationary cutting die (1), and a cutting mandrel (13) which is introduced into the pipe (3) and which comprises a stationary mandrel (14) and a mandrel (16) that can be moved relative to the stationary mandrel (14). The cutting mandrel (13) is arranged in a cutting position during a cutting process, and the cutting mandrel (13) is arranged in the pipe (3) in a floating manner. A magnetic coupling (6) is provided with a coupling stator (7) arranged outside of the pipe (3) and a coupling rotor (21) arranged on the stationary mandrel (14).