Torque Split Driving Arrangement for Heavy-Duty Grinding Mill Pinions
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Solution Overview
Problem
Conventional driving arrangements for heavy-duty grinding mills face challenges in manufacturing complexity, high costs, contamination of bearings and speed reduction gearing, and reduced lifespan due to inadequate sealing and lubrication, especially in mining environments where environmental contaminants affect the girth gear and housing.
Innovation Solution
A driving arrangement featuring a torque split mechanism with separate support for engaging pinions, a girth gear guard for protection, and a clean lubrication system, allowing for easier manufacturing and installation, and enabling the use of well-known components to support large mills with reduced costs and increased power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the pinions and speed reduction gearing are housed in a common housing with the girth gear, then the structure is compact and integrated, but the housing becomes susceptible to contamination from environmental factors affecting bearing lifespan
Solution Approach 1:
The patent divides the housing into separate compartments: a first housing for the girth gear and a second housing for the pinions and speed reduction gearing. This segmentation isolates the sensitive bearings and gearing from environmental contaminants that affect the girth gear, thereby protecting bearing lifespan while maintaining structural integration through controlled interfaces between compartments.
2Ease of manufacture
If a single large housing is used to contain all drive components, then manufacturing is simplified, but sealing and lubrication become inadequate preventing contamination
Solution Approach 1:
The housing is segmented into multiple compartments with independent sealing capabilities. The first housing compartment contains the girth gear while the second housing compartment contains the pinions and speed reduction gearing. Each compartment can be sealed independently, preventing contamination from reaching sensitive components while still allowing the housing to be manufactured as an integrated structure.
3Stability of the object's composition
If the pinion support housing is directly connected to the girth gear housing, then the structure is rigid and stable, but contaminants can penetrate affecting component lifespan
Solution Approach 1:
The patent creates a rigid structural connection between the first housing (girth gear) and second housing (pinions and gearing) while maintaining internal segmentation. The housing walls act as barriers that prevent contaminant penetration between compartments, preserving both structural rigidity for stable operation and component isolation for extended lifespan by protecting against harmful environmental factors.
Data Source
AI summary
Driving arrangement for a heavy-duty grinding mill (50) having a horizontal tube with a circumferential girth gear (51), comprising a driving assembly, comprising a motor (10); at least two engaging pinions (42, 44) configured to engage the girth gear (51) for driving the grinding mill (50); at least one gearbox (20) comprising an input shaft (22) for coupling the motor (10) with the at least one gearbox (20), at least two output shafts (31, 32) for coupling the gearbox (20) with the at least two engaging pinions (42, 44) and a torque split arrangement being configured to transmit torque of the input shaft (22) to the at least two output shafts (31, 32); and at least one frame (48) for supporting the at least two engaging pinions (42, 44) separate from the gearbox (20), and a heavy-duty grinding mill.