Bowl Mill Shaft Support Relocation
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Solution Overview
Problem
Existing pendular mills face complexities in lubrication systems requiring expensive machining, balanced air circulation, and difficult maintenance due to their design, which complicates maintenance and increases costs.
Innovation Solution
The pendular mill design relocates the means for supporting and holding the central shaft outside the dusty enclosure, simplifying air circulation and maintenance by using a rotating hearth with a speed reducer assembly, and eliminating the need for internal lubrication protection, allowing for a cleaner and more efficient lubrication system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the central shaft is supported inside the enclosure with pivot connections, then the shaft can be held and guided in rotation, but the lubrication system becomes complicated and expensive requiring oil circulation circuits and air injection systems
Solution Approach 1:
The patent extracts the central shaft support function from the internal enclosure environment and relocates it to an external position. The shaft is now supported outside the enclosure, eliminating the need for complex internal lubrication protection systems while maintaining reliable shaft rotation guidance.
Solution Approach 2:
The patent introduces a sealed bearing housing as an intermediary structure that contains the lubrication system externally. This housing acts as a mediator between the shaft rotation requirement and the dust-free lubrication environment, allowing simple oil circulation without requiring complex air injection protection within the enclosure.
2Reliability
If air injection circuits are provided for each pendulum to protect lubrication, then lubrication is protected from dust, but the air circulation system becomes complicated and difficult to balance
Solution Approach 1:
The patent extracts the air injection protection system from the pendulum lubrication points and relocates the lubrication function externally. By supporting the shaft outside the enclosure, the complex air circulation circuits to each pendulum are eliminated, while lubrication remains protected through the sealed external bearing housing.
3Reliability
If the pivot connection between central shaft and column is provided inside the enclosure, then the shaft can be supported, but maintenance becomes complicated due to difficult access
Solution Approach 1:
The patent extracts the shaft support function from the internal enclosure where maintenance is difficult, and relocates it to an external position where access is easy. The sealed bearing housing is positioned externally, allowing straightforward maintenance while the enclosure remains sealed for its dust protection function.
4Ease of operation
If oil circulation lubrication is provided for pivot connections inside the enclosure, then lubrication is provided, but the system requires complicated machining and expensive components
Solution Approach 1:
The patent extracts the lubrication system from the internal enclosure environment and relocates it externally. This allows the use of standard sealed bearing housings with simple oil circulation, eliminating the need for complicated machining and expensive custom components that would be required to integrate lubrication within the enclosure.
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 simplifies maintenance, reduces downtime, and lowers costs by eliminating the need for complex and expensive lubrication and air circulation systems, while ensuring effective protection of the lubrication system from dust and abrasive environments.
Implementation Method 1
The flow of gas at the base of the grinder causes the particles of finer material to be suspended, after grinding by the rollers and the evacuation of these particles from the top of the grinder.
Implementation Method 2
there is provided a ventilation system blowing a stream of gas at the base of the grinder
Implementation Method 3
When the star is driven in rotation via a central vertical shaft, the rollers, subjected to centrifugal force, compress the material between the ring and the latter.
Implementation Method 4
On the bottom of the crusher are provided coulters intended to scrape the material which has deposited on the bottom of the crusher. The coulters are driven in rotation around the shaft by means of a skirt fixed to the latter.
Implementation Method 5
For wet materials, it is necessary to dry them, using a flow of gas heated to a temperature of up to 400°C.
Implementation Method 6
there is provided, at the base of the mill, a means of injecting clean and fresh air between the column and the skirt. This stream of air also has the purpose of cooling the pivot connection.
Implementation Method 7
Means of lubrication, by oil circulation, are provided for each connection of two elements which move relative to each other, and in particular at the level of the pivot connection between the central shaft and the column.
Data Source
Figure 1~2
Figure 3
AI summary
Compression bowl mill allowing mineral substances to be reduced to a fine powder, of the type comprising: - a cylindrical enclosure provided with a horizontal base (bottom); - a ring-shaped element concentric with the enclosure and inside the latter; - a rotary central shaft; - at least two pebbles each mounted with the ability to rotate on a pendular rod; - a connecting system between the central shaft and the pendular structures, fixed by a rigid connection to the central shaft and by pivot connection means between each pendular structure, so as to allow materials situated between the pebbles and the interior wall of the ring to be crushed; - means for supporting and holding the shaft; - means for driving the rotation of the shaft, characterized in that the means for supporting and holding the shaft are external to the enclosure and independent thereof.