Rotating Pipe Machining Device with Adjustable Bearing Balance
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Solution Overview
Problem
Existing split frame pipe machining devices face challenges in accurately balancing the forces on bearings, leading to misalignment and premature wear, making it difficult to maintain proper balance over time due to the limitations in radial positioning accuracy and the tendency of bearings to shift out of balance.
Innovation Solution
The device employs a combination of radially fixed and adjustable bearings, with precision positioning of certain bores to ensure accurate force distribution, using mounting shafts with undercuts to securely retain their radial orientation and prevent rotation, allowing for easier adjustment and longer-lasting balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If all bearings are mounted on adjustable off-center shafts to allow radial positioning, then the bearings can be radially moved to balance forces, but the structure becomes complex and it is virtually impossible for a technician to equally balance the forces against all bearings
Solution Approach 1:
The patent applies local quality by making only two opposite bearings adjustable on off-center shafts, while the remaining bearings are fixed on centered shafts. This localized adjustability provides sufficient force balancing capability without requiring all bearings to be adjustable, thereby reducing overall system complexity while maintaining adequate precision.
Solution Approach 2:
The bearing support system is segmented into two distinct types: adjustable off-center shafts for critical bearings and fixed centered shafts for other bearings. This segmentation allows the complex adjustment mechanism to be applied only where necessary, simplifying the overall device while achieving the required force balance.
2Manufacturing precision
If technicians manually adjust and tighten nuts on multiple off-center shafts to balance bearing forces, then force distribution can be improved, but the shafts tend to rotate during tightening and the adjustment is lost over time
Solution Approach 1:
The patent incorporates preliminary action by providing precision-machined reference surfaces on the stationary annular member that guide the mounting shafts into correct radial positions before final tightening. This pre-positioning ensures accurate force balance is achieved and maintained, preventing shaft rotation during nut tightening and eliminating the need for repeated adjustments.
3Manufacturing precision
If precision bores are positioned to fraction of a thousandth of an inch accuracy to maintain proper bearing force balance, then force distribution is optimized, but such positioning accuracy cannot be achieved in standard manufacturing
Solution Approach 1:
The patent introduces an intermediary mechanism - adjustable mounting shafts with reference surfaces that interface with precision-machined but not ultra-precise bores in the stationary member. The adjustability of the shafts compensates for normal manufacturing tolerances in the bores, achieving proper force balance without requiring fraction-of-thousandth-inch bore positioning accuracy.
Data Source
AI summary
A machining device has a stationary member and a rotating member. A plurality of bearings on one of the members engages a surface of the other. At least one of the bearings is radially fixed, while the remainder of the bearings are radially adjustable. In another aspect of the invention, the bearings are rotatable on a first cylindrical portion of a mounting shaft that has a second cylindrical portion attachable to the machine. A radial undercut is provided around a flange between the first cylindrical portion and the second cylindrical portion.