Rotary Hose Guide for Sewer Cleaning
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Solution Overview
Problem
Existing sewer cleaning devices struggle to achieve large angles of rotation for the flushing hose due to its rigidity under high-pressure conditions, limiting steerability and curve mobility within sewer channels.
Innovation Solution
A rotary unit with a drum and deflection roller mounted on a rotary arm that can rotate about an axis coaxial with the drum, allowing the hose to be guided around the drum's circumference, enabling significant rotation of the hose without twisting the upstream section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the flushing hose is pressurized with high-pressure water, then the flushing hose becomes very rigid for effective cleaning, but the flushing hose cannot be rotated or can only be rotated to a small extent
Solution Approach 1:
The hose system is segmented into multiple sections with rotation joints between them. The first rotation joint is located at the upstream end of the flushing hose, allowing the front strand to rotate independently from the rear strand. This segmentation enables the front hose section to achieve large rotation angles for steering into lateral branches while the rear section remains relatively stable during high-pressure operation.
Solution Approach 2:
A rotation joint acts as an intermediary element between the upstream and downstream hose sections. This joint includes a housing with a rotation axis, allowing the front hose strand to rotate relative to the rear strand. The rotation joint mediates the conflicting requirements by enabling rotation where needed while maintaining structural integrity during high-pressure flushing.
2Ease of operation
If the known rotary unit with pressure rollers is used, then the downstream strand of the flushing hose is rotated, but the upstream strand becomes twisted
Solution Approach 1:
The hose system is divided into separable sections connected by rotation joints. The first rotation joint at the upstream end allows independent rotation of the front strand without transmitting rotational stress to the rear strand connected to the stationary device. This prevents twisting accumulation in the upstream section while still enabling the downstream strand to rotate for steering control.
Solution Approach 2:
Instead of rotating the hose at the downstream end as in known arrangements, the rotation joint is positioned at the upstream end of the flushing hose. This inverted approach allows rotation to occur at the point where it causes least disturbance, preventing twisting in the upstream section while achieving the desired steering capability.
3Adaptability or versatility
If larger angles of rotation or complete revolutions of the flushing hose are required for good steerability, then the known arrangement is not suitable, but a simple and inexpensive construction is desired
Solution Approach 1:
The rotation joint incorporates a dynamic design with a housing that can rotate about a vertical axis, allowing the front hose strand to achieve large rotation angles including complete revolutions. The rotation joint includes a rotation axis and enabling structure that permits 360-degree rotation, providing excellent steerability for navigating complex sewer networks with multiple branches.
Solution Approach 2:
The rotation joint serves as a simple intermediary component that enables large rotation angles without requiring complex mechanisms. It consists of a housing with a rotation axis and minimal additional parts, providing versatile steering capability while maintaining a simple and inexpensive construction suitable for sewer cleaning applications.
Data Source
Figure 1~2
Figure 3~4
AI summary
The device has a rotary aggregate (11) continuous from a rinsing hose (2) and downstream to a reel (3). The rotary aggregate comprises a small hose supply holding drum (12) and a deflection roller (4), which is arranged at an outer side. The deflection roller is attached to the rotary aggregate. The deflection roller is held in a rotary arm (13), which is rotated at an axis coaxial to an axis of the holding drum. The rotary arm is driven by a motor in a rotation direction. The rotary arm is positioned on a support-free side of the drum.