Flexible Blade Underwater Pipe Cutter
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing underwater cutting tools for internal pipes require dewatering and sequential deployment of larger tools for thicker pipes, increasing operation time, cost, and complexity due to limited cutting depth and radius.
Innovation Solution
A cutting apparatus with flexible, laminated blades that extend radially, featuring foldable tabs and notches for adjustable rigidity and flexibility, allowing for a larger cutting radius and effective cutting of thicker-walled pipes with narrower inner dimensions using a gearbox and leadscrew for actuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional mechanical cutting apparatus with fixed blades are used, then the structure is simple, but the cutting depth is limited by tool diameter requiring sequential deployment of larger tools for thicker pipes
Solution Approach 1:
The blade is designed with a flexible portion that allows it to dynamically change its configuration from a retracted state during insertion to an extended radial state during cutting. This dynamic flexibility enables the blade to achieve greater cutting depth while maintaining a compact tool diameter, eliminating the need for sequential deployment of multiple tools.
Solution Approach 2:
The blade is configured to nest within the tool body during non-cutting operations, with the flexible portion allowing it to be stored in a compact form. During cutting, the blade extends radially outward from the tool body, achieving the required cutting depth. This nesting capability allows a single tool to perform multiple cutting depths without requiring multiple tools of increasing size.
2Strength
If blade thickness is increased to maintain rigidity for effective cutting, then cutting effectiveness improves, but the blade cannot flex to engage guide means
Solution Approach 1:
The blade is segmented into distinct functional portions: a rigid cutting portion at the distal end for effective cutting, and a flexible portion closer to the mounting for engagement with guide means. This segmentation allows each portion to be optimized independently - the cutting portion maintains sufficient thickness and rigidity for effective cutting, while the flexible portion can bend to engage guide rails during blade extension and retraction.
Solution Approach 2:
Different portions of the blade have different mechanical properties tailored to their specific functions. The cutting portion has higher rigidity and thickness for effective material removal, while the flexible portion has lower rigidity and greater elasticity for engagement with guide means. This local differentiation of mechanical properties resolves the contradiction between overall blade rigidity and localized flexibility.
3Productivity
If a single tool is used to cut thicker pipes, then operation time is reduced, but the blade must be both thick for rigidity and thin for flexibility
Solution Approach 1:
The blade's flexible portion enables dynamic extension and retraction, allowing a single tool with optimized blade geometry to handle varying pipe thicknesses. The blade can be extended radially to achieve the required cutting depth for thicker pipes, then retracted for tool removal, all while maintaining the structural integrity needed for effective cutting.
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 efficient cutting of thicker-walled pipes with narrower inner dimensions and multiple concentric pipes in a single deployment, reducing operation time and complexity while maintaining blade thickness and rigidity.
Implementation Method 1
a flexible portion between the first end and the first mounting portion; and guide means for guiding the at least one blade, the flexible portion being configured to flex where the flexible portion engages the guide means
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An apparatus (2) for cutting pipe is disclosed. The apparatus comprises a motor (6) and a cutting assembly (10) having a mounting plate (18) and a blade (20). The blade comprises a cutting portion (32) and a flexible portion (36). A ramp (22) guides the blade such that the flexible portion flexes where it engages the ramp. The motor causes the blade to rotate. The mounting plate moves the blade along the ramp between a deployed condition and a retracted condition, wherein the cutting portion in the deployed condition is arranged radially further outwards than in the retracted condition.