Raise Boring Reamer Head Cuttings Evacuation
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Solution Overview
Problem
Existing reamer heads for raise boring operations face issues with cuttings accumulation beneath the roller cutters, leading to increased wear and potential cessation of rotation due to stuck debris.
Innovation Solution
A reamer head design featuring a mounting plate with a through-hole cutout allows cuttings to escape downward, reducing accumulation and wear by facilitating gravity-driven evacuation through a configuration that ensures smooth flow from cutter pockets to the cutout, with optional chute and concave shapes to enhance flow and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a solid mounting plate is used to support roller cutters, then structural strength is improved, but cuttings accumulate beneath the roller cutters causing increased wear
Solution Approach 1:
The mounting plate is segmented by introducing cutouts that divide the solid structure into sections. These cutouts allow cuttings to pass through while the remaining plate structure maintains structural strength. The plate is no longer a continuous solid but a segmented structure with strategic openings.
Solution Approach 2:
Material is extracted from the mounting plate by creating cutouts in the form of through-holes. This removal of material serves the dual purpose of maintaining plate strength while creating pathways for cuttings evacuation, directly addressing the accumulation problem.
2Productivity
If cutouts are added to the mounting plate for cuttings evacuation, then cuttings removal is improved, but structural strength may be reduced
Solution Approach 1:
The mounting plate has non-uniform structure with cutouts strategically positioned in specific locations where they provide cuttings evacuation pathways. The plate maintains full strength in areas where structural support is critical, creating local variations in structure that optimize both strength and evacuation functionality.
Solution Approach 2:
The cutouts are positioned asymmetrically or selectively rather than uniformly distributed, placing openings only where they serve the cuttings evacuation function without compromising critical structural areas. This asymmetric arrangement optimizes the balance between evacuation efficiency and structural integrity.
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 design effectively reduces wear on roller cutters and inserts, prevents rotation cessation, and maintains structural strength by ensuring efficient cutting evacuation, thereby improving operational efficiency and tool longevity.
Implementation Method 1
Cuttings produced during the drilling operation will fall down from the roller cutters towards the rearward end due to gravity.
Data Source
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AI summary
A reamer head 10 for raise boring operations comprising: a reamer body 16, a plurality of roller cutters 21 connected to the body 16, each connected to the body 16 using a mounting plate 22, and an upper drill string connection 12 connected to the body 16, wherein the mounting plate 22 comprises a cutout 26 in the form of a through hole for removal of cuttings from the reamer head 10.