Moveable Shaft Assembly for Mining Roll Sizer Tramp Material Bypass
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Solution Overview
Problem
Conventional mining roll sizers are prone to binding and pick breakage due to tramp material, requiring shutdown for removal and repair, as the picks are unable to break apart hard, dense materials.
Innovation Solution
A moveable shaft assembly with a frame, mobile shaft supports, and actuators that adjust the shaft spacing in response to reaction forces, allowing tramp material to pass through without damaging the roll assemblies by increasing the gap between the rolls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the picks are made strong and rigid to break hard tramp material, then the crushing capability is improved, but the picks are more prone to breakage when encountering tramp material
Solution Approach 1:
The shaft assembly is made moveable relative to the frame along the shaft axis, allowing dynamic adjustment of the roll spacing. When tramp material is detected, the shaft can move to increase spacing and bypass the material, preventing pick breakage while maintaining crushing capability for normal material
2Productivity
If the roll spacing is fixed to maintain consistent crushing pressure, then the crushing efficiency is improved, but the system cannot accommodate tramp material without binding
Solution Approach 1:
The shaft assembly can move dynamically along its axis to adjust roll spacing in real-time. This allows the system to maintain optimal crushing pressure for normal material while adapting to tramp material by increasing spacing to bypass it, preventing binding
Solution Approach 2:
A sensing system detects forces on the shaft and provides feedback to control the moveable shaft assembly. When tramp material is detected through increased reaction forces, the system automatically adjusts shaft spacing to accommodate the tramp material, maintaining continuous operation
3Productivity
If the roll sizer operates continuously to maximize productivity, then the output is improved, but shutdowns are required for tramp material removal and repairs
Solution Approach 1:
The moveable shaft assembly allows continuous operation by dynamically adjusting roll spacing when tramp material is detected. The shaft can move to bypass tramp material without shutting down, eliminating downtime for removal and repairs while maintaining productivity
4Productivity
If the picks are arranged densely to maximize material engagement, then the crushing capacity is improved, but the system is more vulnerable to binding when encountering tramp material
Solution Approach 1:
The dense pick arrangement maintains high crushing capacity for normal material, while the moveable shaft assembly provides a safety mechanism. When tramp material is encountered, the shaft can move to increase spacing, preventing binding and protecting the densely arranged picks from damage
Data Source
AI summary
A moveable shaft assembly including a frame, a first shaft, and a first drive assembly. The frame includes a first support wall and a second support wall opposite the first support wall. The first shaft includes a drive end and a support end and defining a first axis therebetween. The first shaft extends between the first support wall and the second support wall. The first drive assembly rotates the first shaft about the first axis, and the first drive assembly is coupled to the drive end of the first shaft. The first shaft and first drive assembly are moveable relative to the frame in response to a reaction force acting on the first shaft in a direction oblique or transverse to the first axis.