Sewer Milling Head Positioning for Side Inlet Rehabilitation
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Solution Overview
Problem
Existing sewer rehabilitation milling systems are cumbersome and require manual operation, necessitating frequent tool changes for different-sized side inlets and exposing operators to high restoring forces.
Innovation Solution
A milling system with a motor unit and a milling head that allows the milling tool to move along three independent axes (X, Y, Z), enabling precise positioning and operation without requiring the carriage to change position, and incorporating a control device with sensors to adjust movements and reduce mechanical load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the milling tool is made large to open closed side inlets completely in a single process, then the milling capability is improved, but the device becomes heavy and complex requiring large carriages
Solution Approach 1:
The milling device is divided into modular components: a carriage for transport, a milling head with the milling tool, and a control unit. This segmentation allows the milling tool to be detached and replaced independently, enabling the use of smaller, lighter tools for different side inlet sizes rather than requiring one large tool for all applications.
Solution Approach 2:
The milling head is designed with universal applicability through the ability to exchange milling tools of different diameters. The same carriage and milling head structure can handle various side inlet sizes by simply changing the milling tool, making the system multi-functional and adaptable to different sewer rehabilitation tasks.
2Manufacturing precision
If different-sized milling tools are used for different side inlets, then the milling precision is improved, but the device complexity increases due to frequent tool changes
Solution Approach 1:
The milling tool is extracted as a separate, interchangeable component from the milling head. This allows the milling tool to be removed and replaced independently without affecting the carriage or milling head structure, simplifying the tool change process and reducing the complexity of the overall system.
Solution Approach 2:
The system is designed to be dynamically adaptable through quick-change milling tools. The milling head can be rapidly reconfigured with different tools depending on the specific task, allowing the device to transition between different operational states efficiently without permanent modifications.
3Measurement precision
If the carriage is moved along the sewer axis to position the milling tool, then the positioning capability is improved, but the operation time increases due to frequent carriage movements
Solution Approach 1:
The milling head is equipped with extension arms that provide additional positioning capability perpendicular to the sewer axis. This allows the milling tool to reach side inlets at different lateral positions without requiring the carriage to move along the sewer, reducing operation time while maintaining positioning accuracy.
4Productivity
If high restoring forces are applied during milling, then the milling effectiveness is improved, but the mechanical load on the device increases requiring heavier construction
Solution Approach 1:
The control unit is designed to monitor and manage the milling process in advance, allowing for optimized control of the milling tool's movement and cutting parameters. This preliminary control helps distribute and manage the restoring forces during milling, reducing peak mechanical loads on the carriage and support structures.
Data Source
AI summary
A milling system is provided for the rehabilitation of a sewer, in particular a wastewater sewer, comprisinga motor unit, anda milling head on which a milling tool is arranged, whereinthe milling head is coupled to the motor unit and the milling tool is movable along at least one movement axis, andthe motor unit is coupled to the milling head in such a way that it can cause the milling tool to move along at least one movement axis.