Underground Reamer Cutting Wing Stabilization
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Solution Overview
Problem
Existing underground reamers with fixed cutting wings by welding or bolting face challenges in on-site repair and maintenance, leading to axial run out issues and binding problems due to wing deflection and vibration, necessitating workshop-based repairs and replacement.
Innovation Solution
A reamer design with releasably engaging cutting wings and a stabilization ring system that uses flanges and bolts to resist rotation and longitudinal movement, allowing for field replacement of cutting wings and reducing bolt stress, enabling secure and stable operation without workshop return.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If cutting wings are fixed to the cylindrical body by welding or bolting, then the reamer can operate to enlarge the hole, but the cutting wings cannot be easily replaced on site and require workshop repairs
Solution Approach 1:
The reamer is divided into modular components: the cylindrical body, removable cutting wings, and stabilizing ring. The cutting wings can be detached and replaced independently without affecting the entire reamer assembly, enabling on-site maintenance while keeping the overall structure relatively simple.
2Ease of repair
If bolts are used to attach cutting wings to the cylindrical body, then the wings can be replaced, but the bolts are placed under high torsional load and can work loose causing wing deflection
Solution Approach 1:
The stabilizing ring is welded to the cylindrical body and provides integrated support to multiple cutting wings simultaneously. This distributes the torsional loads across the rigid stabilizing ring structure rather than concentrating them on individual bolts, preventing bolt loosening and wing deflection while maintaining replaceability.
3Stability of the object's composition
If a stabilizing ring is welded to the tips of cutting wings, then lateral stability and vibration reduction are improved, but the cutting wings become fixed and cannot be replaced in the field
Solution Approach 1:
The stabilizing ring is separated into two independent components: the ring itself (which provides stability) and the cutting wings (which can be replaced). The ring is welded to the cylindrical body while the wings attach to the ring via removable connections, allowing the wings to be replaced without affecting the welded stabilizing structure.
4Stability of the object's composition
If cutting wings are made fixed to provide stability, then vibration is reduced, but axial run out tolerances become difficult to achieve in fabrication
Solution Approach 1:
The modular attachment system with precision-machined locating features on the cylindrical body and corresponding features on the cutting wings enables accurate repositioning of replacement wings. This self-aligning mechanism maintains axial run out tolerances without requiring complex fabrication processes, as each wing automatically positions itself correctly when attached.
Data Source
Figure 1(a)~1(b)
Figure 2(a)
Figure 2(b)
AI summary
This invention concerns a reamer for underground passageways made, for instance, for the installation of cables or pipelines to distribute services in a reticulated network. It comprises a support housing having plural integral pairs of spaced-apart laterally extending support wings, wherein between each pair of support wing there is a longitudinally extending slot to receive a laterally extending cutting wing such that each cutting wing is captured between a respective pair of support wings. A stabilization ring comprising a circular sleeve supported by plural radial support pillars which extend from a central collar. Wherein, the cutting wings engage with the support housing to resist rearward longitudinal movement, with the support wings to resist torsional forces, and with the circular sleeve of the stabilization ring to resist radial movement.