Mill Driving Device Helical Gear Segmented Maintenance
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Solution Overview
Problem
Driving devices with spur teeth have limited transmission power for a given size and require complex and costly maintenance.
Innovation Solution
The use of a gear ring with helical teeth and output pinions with helical teeth, along with disconnectable connecting means that allow the output shaft to rotate during module insertion or removal, enabling easy and quick maintenance without disassembling the case.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If spur teeth are used in the gear ring and output pinions, then the device structure is simpler, but the transmission power is limited for a given size
Solution Approach 1:
The patent changes the geometric parameters of the gear teeth from straight spur teeth to helical teeth with specific helix angles. This parameter change allows the teeth to engage gradually along the helix, increasing the contact area and load-bearing capacity, thereby transmitting more power for a given gear size without fundamentally changing the gear structure
2Ease of repair
If the output module is firmly connected to the output shaft, then the power transmission is more reliable, but the maintenance becomes complex and costly
Solution Approach 1:
The patent segments the connection between the output module and output shaft by introducing disconnectable connecting means. This allows the output module to be separated from the output shaft for maintenance while maintaining a secure connection during operation, enabling quick removal and reinstallation without disassembling the entire case
Solution Approach 2:
The connecting means transitions from a static firm connection to a dynamic connection that can be easily disconnected and reconnected. This dynamic connection maintains reliability during operation through secure engagement while allowing rapid disconnection for maintenance, eliminating the need for complex permanent fastening mechanisms
3Loss of time
If the output module requires case disassembly for maintenance, then the structural integrity is maintained, but the maintenance time and cost increase
Solution Approach 1:
The patent divides the reduction transmission into separable output modules that can be independently removed from the case. The disconnectable connecting means enables the output module to be detached from the output shaft before removal, allowing maintenance without case disassembly and significantly reducing maintenance time and complexity
Data Source
AI summary
The disclosure describes a driving device for a mill including a gear ring, suitable for being fastened to a grinding chamber, a first reduction transmission suitable for transmitting a rotation from a first motor to the gear ring, the reduction transmission comprising a case, an output module including an output pinion and an output shaft defining an output axis. The gear ring has helical teeth, the output pinion has helical teeth, the or each output module can be inserted in a single piece into the associated case in an insertion direction or removed in a single piece from that associated case in a removal direction. The driving device includes a disconnectable connecting element suitable for rotatably connecting the output shaft to a transmission element and allowing, in a disconnected state, a rotation of the output pinion around the output axis upon removal of the output module outside the case or during insertion of the output module into the case.