Cylindrical Workpiece Machining With Detachable Traction Drive
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Solution Overview
Problem
Existing methods for processing cylindrical workpieces, such as pipes or cables in narrow or deep excavation pits, are inefficient due to the need for a fixed connection between the tool and the drive mechanism, limiting the force transmission and accessibility.
Innovation Solution
A method and device where the traction device is detachably connected to the tool carrier, allowing for efficient force transmission by forming a non-positive or positive connection that can be released and reapplied, enabling movement around the workpiece without a permanent attachment, using a flexible traction mechanism that can wrap around the tool carrier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed connection between the traction device and the tool carrier is used, then the force transmission is stable, but the accessibility in narrow and deep excavations is limited
Solution Approach 1:
The patent applies the dynamics principle by making the connection between the traction device and tool carrier changeable rather than fixed. The connection can be dynamically established and released based on operational needs, allowing the system to adapt between requiring stable force transmission and needing accessibility for repositioning in confined excavation spaces.
Solution Approach 2:
The patent segments the connection system into separable components - the traction device can be detached from the tool carrier. This segmentation allows independent positioning and manipulation of each component, improving accessibility in narrow excavations while maintaining stable force transmission when connected.
2Device complexity
If a rigid actuating arm is used, then the structure is simple, but the pivoting angle decreases with increasing excavation depth
Solution Approach 1:
The patent replaces rigid actuating arms with a flexible traction device (such as a rope or cable) that can wrap around the tool carrier. This flexible element maintains structural simplicity while providing adaptability to various pivoting angles and excavation depths, as it can be routed around obstacles and adjusted to reach the tool carrier from different positions.
Solution Approach 2:
The patent transitions from a one-dimensional rigid arm to a two-dimensional flexible path that can wrap around the tool carrier. This dimensional change allows the traction device to achieve the necessary pivoting angles by routing around the workpiece, effectively increasing adaptability without significantly increasing structural complexity.
3Productivity
If the traction device is permanently attached to the tool carrier, then the force transmission efficiency is high, but the flexibility for repositioning is reduced
Solution Approach 1:
The patent implements periodic connection and disconnection of the traction device to the tool carrier. During operational phases, the connection is established for efficient force transmission; during repositioning phases, the connection is released. This periodic action pattern allows the system to achieve both high productivity during machining and flexible repositioning when needed.
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
This approach allows for efficient force transmission and operation in small and deep excavations, enabling effective machining of cylindrical workpieces with high torque transmission, simplicity, and flexibility, suitable for untrained operators without external power sources, and adaptable to various diameters and depths.
Implementation Method 1
a non-positive and/or positive connection is formed between the traction device and the tool carrier
Data Source
Figure 1a~1b
Figure 1c~1e
Figure 2a~2c
AI summary
The invention relates to a method for machining a cylindrical workpiece, comprising the steps of: arranging a tool carrier with a tool on the cylindrical workpiece, applying a traction element to the tool carrier, transferring the force exerted on the traction element to the tool to effect a movement of the tool carrier around the workpiece, releasing the traction element from the tool carrier and repeatedly applying the traction element again and transferring the force exerted on the traction element to the tool, as well as releasing the traction element for machining the workpiece.