Internal Pipe Cutting Spindle With Flexible Blades for Curved Pipes
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Solution Overview
Problem
Existing methods for cutting pipes from the inside, such as using grinding robots, are slow, prone to errors, and difficult to maneuver through complex pipe structures, often requiring street closures for operation.
Innovation Solution
A device with a spindle equipped with flexible protrusions and blades that can be rotated to cut the pipe inner surface, allowing for easier navigation through curved pipes and precise cutting without the need for high-speed rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a grinding robot with rigid push bars is used to machine pipes from inside, then the robot can be controlled to grind the inner wall, but the robot is difficult to move through sharp turns and complex pipe structures
Solution Approach 1:
The device divides the cutting function into multiple independent cutting elements (blades) distributed around the spindle circumference, allowing the device to navigate complex pipe geometries while maintaining cutting capability through flexible positioning of individual segments
Solution Approach 2:
The device uses flexible strips with cutting blades that can bend and conform to the pipe inner surface, replacing rigid robot structures with flexible elements that can navigate sharp turns and complex pipe configurations
2Productivity
If a pneumatic motor is used to rotate the grinding blade at high speed, then the blade can grind the pipe wall, but the machining process becomes slow and requires very high rotation speeds (10,000-30,000 rpm)
Solution Approach 1:
The invention replaces the pneumatic motor system with a mechanically driven cutting system where a cable-rotated spindle directly drives cutting blades, eliminating the need for high-speed pneumatic rotation while achieving effective material removal through direct mechanical cutting action
Solution Approach 2:
The device transitions from static high-speed rotation to dynamic cutting where the spindle rotation speed (1,000-4,000 rpm) is optimized for direct mechanical cutting efficiency rather than pneumatic grinding requirements
3Power
If a grinding robot is used with low torque pneumatic operation, then the blade can be operated, but the required rotation speed becomes very high (10,000-30,000 rpm) making the process inefficient
Solution Approach 1:
The invention replaces the pneumatic motor with a mechanical cable-driven rotation system that provides high torque at low speeds, enabling effective cutting without requiring the 10,000-30,000 rpm rotation speeds necessary for pneumatic operation
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 quick and accurate cutting of pipes within complex pipe structures, reducing the risk of damage and eliminating the need for street closures during operation.
Implementation Method 1
the strips press against the inner wall of the pipe. A blade is attached to the strips, so at a given point in the pipe, the blades of the rotating device machine material off the inner wall of the pipe
Data Source
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AI summary
A device ( 100) for cutting a pipe from inside, which device comprises a spindle (1 10) arranged to be rotated. The device (100) further comprises protrusions (120) fastened to the spindle (1 10) and arranged to position the device (100) or a part of it inside the pipe, the protrusions (120) comprising at least one blade (130) arranged to machine material off the inner surface of the pipe to cut the pipe while the spindle (110) is being rotated.