Spiral Pipe Forming Without Inner Periphery Restriction
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Solution Overview
Problem
Existing pipe-forming apparatuses for spiral pipes have structural enlargement and weight increase due to inner periphery restriction bodies, which can inhibit water flow and are not suitable for non-circular pipe cross sections, and they often result in diameter reduction of the spiral pipe during formation.
Innovation Solution
A pipe-forming apparatus that omits the inner periphery restriction body, using a pipe end release-type mechanism where the driving part presses the strip portion from the inner periphery to fit with the preceding spiral pipe portion, and a guide portion engages from the outer periphery to stabilize the apparatus and ensure smooth propulsion, allowing for non-circular pipe formation without structural enlargement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an inner periphery restriction body is provided inside the preceding spiral pipe portion, then the cross section of the spiral pipe is restricted and maintained, but the apparatus structure becomes enlarged and heavier, and water flow is inhibited
Solution Approach 1:
The invention removes the inner periphery restriction body from the apparatus, extracting the problematic component that caused structural enlargement and water flow inhibition. Instead, it uses the outer periphery restriction body and driving part configuration to achieve the necessary cross section control without internal restrictions.
Solution Approach 2:
The invention inverts the approach by placing the restriction body on the outer periphery rather than the inner periphery. The outer periphery restriction body restricts the spiral pipe from the outside, eliminating the need for inner periphery restriction and thereby avoiding water flow inhibition while maintaining cross section control.
2Manufacturing precision
If an inner periphery restriction body is provided, then the spiral pipe cross section is maintained, but the apparatus weight increases
Solution Approach 1:
The invention extracts and removes the inner periphery restriction body that added unnecessary weight. The cross section maintenance function is achieved through the outer periphery restriction body and driving part configuration instead, reducing overall apparatus weight.
3Manufacturing precision
If an inner periphery restriction body is provided, then the spiral pipe shape is controlled, but water flow inhibition occurs
Solution Approach 1:
The invention inverts the restriction approach from inner periphery to outer periphery. The outer periphery restriction body controls the spiral pipe shape from the outside, eliminating internal obstructions that caused water flow inhibition while maintaining effective shape control.
4Strength
If the strip member is pressed toward the fitting position, then the fitting portion joins, but the apparatus requires complex tension management
Solution Approach 1:
The invention inverts the pressing direction approach by using the driving part to press the following strip portion from the inner periphery toward the fitting position, utilizing the natural tension in the strip member rather than requiring complex external tension management systems.
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3
AI summary
Provided is a pipe-forming apparatus with which a spiral pipe can be formed using a simple configuration. A driving part 10 of a pipe end release-type pipe-forming apparatus 3 having a non-inner periphery restriction structure presses a following strip portion 92 toward a pipe end portion 91e of a preceding spiral pipe portion 91 obliquely with respect to a machine-height direction HD. A pipe end guide 20 is constrained in a machine-width direction WD with respect to the pipe end portion 91e, and slidably engaged in a propelling longitudinal direction LD. The pipe end guide 20 includes a flat-shaped receiving portion 21a,22a along the propelling longitudinal direction LD. The receiving portion 21a,22a configures to receive the pipe end portion (91e) from the reverse side. A pressing force for the following strip portion 92 provides a fitting force between the following strip portion 92 and the pipe end portion 91e, and a propelling force for forward propulsion.