Spiral Pipe Diameter Control Using Propulsive and Friction Forces
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Solution Overview
Problem
Conventional pipe-making apparatuses require diameter limiting frames, such as annular or radial frames, to prevent spiral pipe diameter shrinkage, leading to increased apparatus size and complexity.
Innovation Solution
A pipe-making apparatus that uses a propulsive reaction force and a resisting force to control the diameter of the spiral pipe without the need for limiting frames, allowing for adjustable resistance to maintain or adjust the desired diameter of the spiral pipe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If diameter limiting frames (annular frame or radial frame) are used to prevent spiral pipe diameter shrinkage, then the spiral pipe diameter can be maintained, but the apparatus size increases
Solution Approach 1:
The invention extracts and eliminates the diameter limiting frame from the apparatus, replacing it with a force-based control mechanism. The propulsive reaction force imparting portion and resisting force imparting portion work together to control diameter shrinkage without requiring the bulky annular or radial frames, thus maintaining manufacturing precision while reducing apparatus volume
Solution Approach 2:
The invention replaces the mechanical diameter limiting frame structure with a force-based control system. Instead of using physical constraints (frames), the system uses propulsive reaction force and resisting force to dynamically control the spiral pipe diameter, substituting a complex mechanical structure with a more compact force application mechanism
2Manufacturing precision
If diameter limiting frames are used to prevent spiral pipe diameter shrinkage, then the spiral pipe diameter can be maintained, but the device complexity increases
Solution Approach 1:
The invention removes the complex diameter limiting frame structure (annular frame with guide rollers or radial frame with support arms) and replaces it with a simpler force application system. The propulsive reaction force imparting portion and resisting force imparting portion create a more straightforward control mechanism that maintains diameter precision without the complexity of multiple frames and rollers
Solution Approach 2:
The invention substitutes the complex mechanical diameter limiting frame system with a force-based control mechanism. Instead of relying on the mechanical constraints of frames and rollers, the system uses controlled force application (propulsive reaction force and resisting force) to achieve diameter control, thereby reducing device complexity
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 the production of spiral pipes with desired diameters without the need for diameter limiting frames, resulting in a more compact and efficient pipe-making apparatus.
Implementation Method 1
a resisting force imparting portion imparting a resisting force along the winding direction to the strip member by friction with the strip member
Data Source
AI summary
A spiral pipe (9) is formed by joining edges of adjacent turns of a strip member (90) while helically winding the strip member using a pipe-making apparatus. A propulsive reaction force for moving in a winding direction of the strip member is imparted to a following strip portion (92) or a preceding spiral pipe portion (91) of the strip member by a propulsive reaction force imparting portion of the pipe-making apparatus. The following strip portion follows a preceding spiral pipe portion that has already been made into a pipe. A resisting force in a direction opposite to the propulsive reaction force is imparted to the strip member along the winding direction by a friction between a resisting force imparting portion and the strip member generated while the strip member is moved forward. In this arrangement, a diameter limiting frame can be omitted, and thereby, the pipe-making apparatus can be downsized.