Spiral Pipe Forming Without Inner Restriction for Stable Diameter

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 pipes with non-circular cross sections, and they often result in reduced pipe diameter and cross-sectional area during the spiral winding process.

Innovation Solution

A pipe-forming apparatus that omits the inner periphery restriction body, using a driving part to press the strip member obliquely and a pipe end guide to engage with the preceding spiral pipe portion, allowing for the formation of spiral pipes without inner periphery restriction, enabling the apparatus to handle non-circular cross sections and maintain pipe diameter by expanding and contracting as necessary.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If an inner periphery restriction body is provided in the pipe-forming apparatus, then the cross section of the preceding spiral pipe portion is restricted from the inner periphery side, but the apparatus structure is enlarged and weight is increased

Engineering Contradiction:

Improvecross section restrictionVSAvoidapparatus weight

Core Design Contradiction:

Manufacturing precisionVSWeight of moving object

Solution Approach 1:

The invention extracts and removes the inner periphery restriction body from the pipe-forming apparatus. Instead of using a complex internal restriction structure, the patent employs a simple outer periphery restriction body that contacts the outer surface of the spiral pipe portion, thereby achieving cross section restriction without the weight and structural complexity of internal restriction mechanisms.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention inverts the traditional approach by placing the restriction body on the outer periphery rather than the inner periphery. The outer periphery restriction body restricts the cross section from the external side, which is the opposite of conventional internal restriction methods. This inversion simplifies the apparatus structure and reduces weight while maintaining effective cross section control.

Inventive Principle:

Principle #13The other way round (Inversion)

2Manufacturing precision

If an inner periphery restriction body is provided in the pipe-forming apparatus, then the cross section of the preceding spiral pipe portion is restricted from the inner periphery side, but the apparatus structure is enlarged

Engineering Contradiction:

Improvecross section restrictionVSAvoidapparatus structure

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The invention extracts and removes the inner periphery restriction body from the pipe-forming apparatus. Instead of using a complex internal restriction structure, the patent employs a simple outer periphery restriction body that contacts the outer surface of the spiral pipe portion, thereby achieving cross section restriction without the weight and structural complexity of internal restriction mechanisms.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention inverts the traditional approach by placing the restriction body on the outer periphery rather than the inner periphery. The outer periphery restriction body restricts the cross section from the external side, which is the opposite of conventional internal restriction methods. This inversion simplifies the apparatus structure and reduces weight while maintaining effective cross section control.

Inventive Principle:

Principle #13The other way round (Inversion)

3Manufacturing precision

If an inner periphery restriction body is disposed inside the rehabilitation pipe, then the cross section is restricted from the inner periphery side, but water flow inhibition occurs

Engineering Contradiction:

Improvecross section restrictionVSAvoidwater flow inhibition

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The invention inverts the traditional approach by placing the restriction body on the outer periphery rather than the inner periphery. The outer periphery restriction body restricts the cross section from the external side, which is the opposite of conventional internal restriction methods. This inversion simplifies the apparatus structure and reduces weight while maintaining effective cross section control.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The invention extracts and removes the inner periphery restriction body from the pipe-forming apparatus. Instead of using a complex internal restriction structure, the patent employs a simple outer periphery restriction body that contacts the outer surface of the spiral pipe portion, thereby achieving cross section restriction without the weight and structural complexity of internal restriction mechanisms.

Inventive Principle:

Principle #2Taking out (Extraction)

4Adaptability or versatility

If the inner periphery restriction body is used for non-circular cross section pipes, then the shape must be changed according to rotational position, but this requires structural enlargement

Engineering Contradiction:

Improveadaptability to non-circular cross sectionVSAvoidapparatus structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The outer periphery restriction body is designed with universal adaptability to accommodate various cross-sectional shapes including circular, oval, and irregular shapes. The restriction body can be rotated and adjusted to match different rotational positions and shape requirements, eliminating the need for multiple specialized restriction bodies for different pipe geometries.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The outer periphery restriction body is designed to be dynamically adjustable and rotatable, allowing it to adapt to different cross-sectional shapes and rotational positions during the pipe forming process. This dynamic capability enables a single restriction body structure to handle various pipe geometries without requiring structural enlargement or complex mechanisms.

Inventive Principle:

Principle #15Dynamics

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

The apparatus simplifies the configuration, reduces water flow inhibition, and allows for stable fitting and propulsion on non-circular surfaces, maintaining the pipe's cross-sectional area and diameter, thus effectively rehabilitating pipes with various cross-sectional shapes.

Implementation Method 1

a driving part pressing a following strip portion following the preceding spiral pipe portion obliquely with respect to a machine-height direction toward a partial part or a vicinity thereof in the preceding spiral pipe portion

Methodology Applied

Scientific EffectFriction: Friction

Implementation Method 2

a pipe end guide provided in a reverse portion of the apparatus frame in the machine-height direction, the pipe end guide being constrained with respect to the pipe end portion in a machine-width direction and being engaged so as to be slidable with respect to the pipe end portion in the propelling longitudinal direction

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS11383427B2Pipe-forming apparatus for spiral pipe and pipe-forming method thereof

Publication Date: 2022.07.12 SEKISUI CHEMICAL CO LTD

AI summary

Both diameter expansion and contraction control and fitting stabilization are achieved at the same time in a pipe end release-type pipe-forming apparatus having a non-inner periphery restriction structure. A driving part (10) provided in an apparatus frame (30) of a pipe-forming apparatus (3N) presses an unformed following strip portion (92) of the strip member (90). A reverse side guide portion (83) is engaged with a pipe end portion (91e) of a preceding spiral pipe portion (91) from a reverse side. A face side guide portion (82) is engaged with the pipe end portion (91e) from a face side. The face side guide portion (82) is shifted to the propulsion rear side beyond the reverse side guide portion (83). The following strip portion (92) is extruded from the driving part (10) toward an inter-guide clearance (84) between the reverse side guide portion (83) and the face side guide portion (82). Preferably, the driving part (10) is position-adjustably attached to the guide portions (83), (82) or the apparatus frame (30) via a position adjustment mechanism (31a).