Spiral Pipe Winding Without Inner Periphery Limiters
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Solution Overview
Problem
Conventional pipe-making apparatuses increase in size due to the use of annular and radial inner periphery limiters, making it difficult to adjust the diameter or cross-sectional configuration of spiral pipes, and they struggle with changes in existing pipe diameters or configurations.
Innovation Solution
A pipe-making apparatus with a fitting height adjuster that allows for variable adjustment of the fitting position in the machine height direction or pipe inside-outside direction, enabling the production of spiral pipes with enlarged or reduced diameters without an inner periphery limiter, using a non-inner-periphery-limited structure and angle adjustments to control the diameter and perimeter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an annular inner periphery limiter or radial inner periphery limiter is used to prevent diameter reduction, then the pipe-making apparatus increases in size and becomes more complex
Solution Approach 1:
The patent removes the inner periphery limiter component entirely from the pipe-making apparatus. Instead of using a physical limiter to prevent diameter reduction, the invention relies on the self-constraining geometry of the spiral winding process itself, where the strip member naturally maintains its diameter through the winding mechanism without requiring additional limiting structures.
Solution Approach 2:
The spiral pipe making process inherently controls its own diameter through the geometric constraints of the winding mechanism. The strip member, when wound spirally around the forming area, automatically maintains a consistent diameter without requiring external limiting structures. The system uses its own operational geometry to enforce dimensional control.
2Manufacturing precision
If an inner periphery limiter is used to maintain pipe diameter, then the apparatus cannot easily adapt to changes in existing pipe diameter or cross-sectional configuration
Solution Approach 1:
The patent employs a dynamic winding mechanism that can adjust to different pipe diameters and cross-sectional configurations. The apparatus allows the spiral strip to be wound with varying parameters, enabling adaptation to different existing pipe sizes and shapes without requiring physical limiters that would constrain flexibility. The system dynamically responds to the specific geometry being formed.
Solution Approach 2:
The pipe-making apparatus is designed to handle multiple pipe configurations and diameters using a single universal mechanism. By removing the specialized inner periphery limiter and relying on the fundamental spiral winding process, the apparatus can adapt to various pipe geometries, making it versatile for different rehabilitation applications without requiring reconfiguration of limiting structures.
3Productivity
If a self-propelled pipe-making apparatus is used to gradually extend the spiral pipe, then the fitting position must be precisely controlled to maintain consistent diameter and shape
Solution Approach 1:
The patent incorporates control mechanisms that monitor and adjust the fitting position during the self-propelled winding process. By implementing feedback control, the system can maintain precise dimensional accuracy while operating in the efficient self-propelled mode, compensating for any variations that occur during automatic extension.
Solution Approach 2:
The apparatus is designed with pre-configured geometric relationships in the winding mechanism that inherently guide the fitting position. By establishing the correct initial geometry and winding parameters, the system ensures consistent diameter and shape maintenance throughout the self-propelled extension process without requiring continuous active adjustment.
Data Source
AI summary
The present invention provides a pipe-making apparatus and a pipe-making method capable of making a spiral pipe variably adjusting a diameter or a perimeter of the pipe without an inner periphery limiter. An edge 94 of a following strip portion 92 of a strip member 90 is fitted with a corresponding edge 93 of a preceding pipe portion 91 preceding by one turn by a pipe-making part 3a of a pipe-making apparatus 3, the following strip portion 92 following the preceding pipe portion 91 precedingly made into the spiral pipe, the following strip portion not yet made into the pipe. The pipe-making apparatus 3a is propelled along a spiral winding direction accompanying the fitting. A position 9q of the fitting is variably adjusted by a fitting height adjuster such as an operating lever 30 in a machine height direction HD or a pipe inside-outside direction VD.