Adjustable Manhole Cutting Device with Self-Centering Engagement
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Solution Overview
Problem
Existing automated digging machines for manhole removal are limited in their ability to efficiently cut and remove manholes due to fixed cutting diameters and lack of adjustable engagement mechanisms, making them inflexible for various street environments and manhole configurations.
Innovation Solution
An automatic manhole removal tool with adjustable blade elements and a self-centering engagement assembly that allows for multiple adjustable engagement arm pairs to align and secure the cutting tool within the manhole, enabling the removal of manhole assemblies with adjustable cutting diameters and accommodating different manhole configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed diameter cutting blades are used, then the cutting device is simple in structure, but it cannot accommodate different manhole configurations and street environments
Solution Approach 1:
The cutting device employs adjustable cutting blades that can be repositioned along the cutting arm to accommodate different manhole diameters. The blades are mounted on adjustable holders that can be moved radially inward or outward, transforming a static fixed-diameter system into a dynamic adjustable-diameter system, thereby resolving the contradiction between structural simplicity and adaptability.
Solution Approach 2:
The cutting device is designed with universal applicability through its adjustable engagement arms and reconfigurable cutting blade arrangement. The same device can cut various diameters and adapt to different manhole configurations by adjusting the blade positions and engagement arm extensions, making one device serve multiple functions rather than requiring different devices for different applications.
2Adaptability or versatility
If fixed engagement arms are used, then the engagement mechanism is simple, but it cannot self-center within manholes of varying sizes
Solution Approach 1:
The engagement arms are designed with adjustable extension capabilities through telescopic sections or movable joints that allow the arms to extend or retract. This dynamic adjustment enables the engagement arms to adapt to different manhole diameters and achieve proper self-centering, transforming a static fixed-geometry engagement mechanism into a dynamic adaptive one.
Solution Approach 2:
The engagement arms are divided into multiple segmented sections that can be independently adjusted or extended. This segmentation allows each section to be positioned to achieve proper engagement and self-centering for different manhole sizes, providing fine-tuned adaptability while maintaining reasonable structural complexity.
3Adaptability or versatility
If adjustable cutting blades are used, then cutting diameter can be varied, but the cutting mechanism becomes more complex
Solution Approach 1:
The cutting blades are mounted on adjustable holders that can be moved radially along the cutting arm using simple mechanical adjustment mechanisms such as threaded rods, sliding joints, or pinned connections. This dynamic positioning capability allows the cutting diameter to be varied while using relatively simple adjustment mechanisms rather than complex systems.
Solution Approach 2:
The cutting diameter is varied by changing the radial position parameter of the cutting blades along the cutting arm. This parameter change is achieved through straightforward mechanical adjustment of blade holder positions, allowing continuous or discrete variation of cutting diameter without requiring fundamentally complex mechanism changes.
Data Source
AI summary
A device to secure, cut and sequentially remove a manhole from a street environment. The manhole removing device is supported and rotatably driven hydraulically by a mobile operation equipment. A circular disk assembly has adjustable pavement cutters adjustably positioned from there within an inter-related manhole centering and a locking alignment and engagement plate assembly define a one-step cutting and removal of an existing manhole from the street for replacement.