Pipe Cleaning Chain Assembly for Variable-Diameter Insertion
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Solution Overview
Problem
Existing pipe cleaning devices face difficulties in navigating through pipes with varying diameters, as larger diameter pipes require longer chains that accumulate near the rear end when used in smaller diameter pipes, increasing the tool's diameter and making it hard to push into smaller pipes.
Innovation Solution
A cleaning device with a non-rotating forward end sleeve and a spring mechanism around a flexible shaft, allowing the forward end sleeve to move along the shaft and adjust the chain extension based on rotation speed, ensuring minimal diameter when not in use and adapting to different pipe diameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If longer chains are used for large diameter pipes, then cleaning effectiveness is improved, but the tool diameter increases making it difficult to push into smaller diameter pipes
Solution Approach 1:
The cleaning device employs a dynamic chain structure where the forward end sleeve can move along the flexible shaft. During rotation, centrifugal force extends the chains outward for effective cleaning contact. When rotation stops, the chains retract to minimize the tool's diameter, enabling easy insertion through smaller pipes. This dynamic adjustment resolves the contradiction between cleaning effectiveness and ease of insertion.
Solution Approach 2:
The chains are designed to nest alongside the flexible shaft when not in use. The forward end sleeve moves to position the chains close to the shaft, creating a compact nested configuration. This nesting principle allows the long chains needed for large pipe cleaning to be stored compactly, facilitating insertion through smaller diameter pipes without modification.
2Manufacturing precision
If the forward end sleeve is fixed to prevent rotation, then chain extension control is improved, but the device complexity increases
Solution Approach 1:
The forward end sleeve features an asymmetric non-circular cross-section that matches the corresponding feature on the flexible shaft. This asymmetric design prevents rotation of the sleeve while allowing longitudinal movement along the shaft. The simplicity of this asymmetric geometric constraint provides precise chain extension control without adding complex mechanical components.
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 effective cleaning of pipes with varying diameters by minimizing the tool's diameter for easy insertion and maximizing chain extension for effective contact, allowing the same device to be used across different pipe sizes without modification.
Implementation Method 1
The cleaning device comprises a spring around the flexible shaft between the rear end sleeve and the forward end sleeve
Implementation Method 2
the spring between the forward end sleeve and the rear end sleeve compresses and resists the movement of the forward end sleeve. When rotation of the flexible shaft is stopped, the force pushing the chains away from the flexible shaft disappears and the spring extends back to its full length
Implementation Method 3
Rotation of the cleaning device exerts a force on the chains in a direction perpendicular to the flexible shaft thereby extending the diameter of the tool
Data Source
AI summary
The cleaning device is for cleaning the inner surface of pipes. The cleaning device has two sleeves on a flexible shaft and chains extending between the sleeves. A forward end sleeve is not attached to the shaft and is biased by a spring on the shaft. The cleaning device can be adapted to different pipe sizes by altering rotation speed of the cleaning device. High rotation speed compresses the spring and moves the chains further away from the shaft to enable cleaning of larger diameter pipes with the cleaning device.