HPGR Tyre Demounting Frame With Damped Shaft Separation
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Solution Overview
Problem
The existing method for demounting high-pressure grinding roller (HPGR) tyres from their shafts requires large hydraulic forces, leading to unpredictable and hazardous movements of the heavy shafts, posing safety concerns and potential damage.
Innovation Solution
A frame and method for demounting HPGR tyres from their shafts, which includes a registration pin to stabilize the shaft, a tyre support with dampeners to absorb the weight and movement of the tyre, and a hydraulic system to gradually separate the tyre from the shaft, ensuring controlled and safe removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If large hydraulic forces are used to remove the tyre from the shaft, then the tyre can be effectively separated from the shaft, but the shaft moves upwards in a sudden and unpredictable way causing safety concerns and potential damage
Solution Approach 1:
A dampener arrangement is mounted on the tyre support to cushion and dampen the sudden upward movement of the tyre during demounting. This beforehand cushioning prevents the shaft from moving upwards in a sudden and unpredictable way, thereby eliminating safety concerns while maintaining the effectiveness of hydraulic force for tyre separation.
2Force
If large hydraulic forces are used to remove the tyre from the shaft, then the tyre can be effectively separated from the shaft, but potential damage may occur to the shaft
Solution Approach 1:
The dampener arrangement provides beforehand cushioning that prevents excessive forces from being transmitted to the shaft during tyre removal. This protects the shaft from potential damage while still enabling effective tyre separation through hydraulic force.
Solution Approach 2:
The dampener arrangement acts as an intermediary element between the tyre and the shaft support structure. It absorbs and dissipates the energy of sudden movements, preventing direct transmission of damaging forces to the shaft while allowing the hydraulic force to effectively separate the tyre.
3Ease of operation
If the tyre is heated to expand it for demounting, then the tyre can be removed from the shaft, but the process becomes more complex and time-consuming
Solution Approach 1:
The invention extracts and eliminates the heating step from the demounting process by using a dampener arrangement that enables tyre removal through controlled hydraulic force alone. This simplifies the overall process while maintaining ease of operation.
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
The solution allows for the safe and controlled demounting of HPGR tyres from their shafts, reducing the risk of accidents and damage, while enabling efficient replacement of worn tyres.
Implementation Method 1
a dampener arrangement mounted on the tyre support and being configured to engage with a lower surface of a tyre to provide balanced support around the circumference thereof
Implementation Method 2
injecting and pressurising fluid between the tyre and the shaft
Data Source
AI summary
A frame (12) for demounting a tyre from an HPGR shaft is disclosed. The frame comprises: a support comprising a plurality of structural beams (42a,c,d) adapted to rest on a surface; a registration pin (46) upstanding from the support and dimensioned to be accommodated within a bore defined by the shaft; a tyre support (60) at least partially surrounding the registration pin; and a dampener arrangement (76) mounted on the tyre support and being configured to engage with a lower surface of a tyre to provide balanced support around the circumference thereof, the dampener arrangement including at least one dampener. A method of demounting a tyre from an HPGR shaft is also described.