Mill Air Nozzle Radial Discharge Prevents Material Adhesion
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Solution Overview
Problem
Existing mill designs face issues with moisture in the material being crushed, leading to adhesion to surfaces and clumping, which reduces operational efficiency and increases cleaning needs.
Innovation Solution
The implementation of an elongated, tubular air nozzle with a parallel guide pipe around the material input pipe, allowing air to be supplied efficiently between the inner and outer rotors, and featuring radial air discharge holes to enhance air distribution and prevent material adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If air is supplied through the gap between the rotating pipe shaft and stationary input pipe, then compressed air can be supplied into the mill to cool and moisten the material, but the air flow dispersion inside the mill is poor and enters only parallel to the shaft
Solution Approach 1:
The air supply system transitions from a single-point axial injection (through the shaft gap) to a distributed multi-directional injection system. The guide pipe with radial holes at its lower end creates air discharge in multiple dimensions (axial and radial directions), fundamentally changing the flow pattern from one-dimensional parallel flow to three-dimensional dispersed flow throughout the mill chamber.
Solution Approach 2:
The air supply function is segmented into multiple discharge points along the guide pipe length, with holes distributed at the lower end. This segmentation allows air to be injected at multiple locations and angles simultaneously, improving overall dispersion compared to the single injection point in the prior art.
2Quantity of substance
If moisture is supplied with the material to be crushed, then the material can be moistened, but moisture causes the material to adhere to surfaces and clump together
Solution Approach 1:
The system converts the potentially harmful effect of moisture (which causes adhesion and clumping) into a beneficial cooling effect. By supplying compressed air that evaporates moisture from the material, the system removes the harmful moisture while utilizing its cooling capability, thus transforming the problem into a solution.
Solution Approach 2:
Compressed air is used as a pneumatic agent to remove moisture from the material through evaporation. The high-velocity air flow provides the energy needed to evaporate moisture quickly, preventing adhesion and clumping while maintaining the desired moisture content for material processing.
3Productivity
If material moisture is high, then the material can be processed, but it adheres to the crushing means and mill inner surface requiring frequent cleaning
Solution Approach 1:
The air supply system performs preliminary moisture removal action before the material reaches the crushing zone. By injecting compressed air at the input end, moisture is evaporated in advance, preventing adhesion before it occurs during crushing and transport, thus reducing or eliminating the need for subsequent cleaning operations.
Solution Approach 2:
The compressed air supply operates continuously throughout the material processing cycle, maintaining constant moisture control and preventing adhesion continuously as material moves through the mill. This continuous action ensures productivity is maintained without interruption for cleaning.
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 solution ensures efficient dispersion of air within the mill, reducing material adhesion and clumping, and minimizing the need for cleaning, thereby improving operational efficiency and processing of materials with moisture.
Implementation Method 1
there are holes in the guide pipe at the lower end of the air nozzle, from which holes air is able to discharge in the radial direction of the shaft of the mill
Implementation Method 2
air is supplied from the top downwards between the inner rotor and the outer rotor
Implementation Method 3
From here, owing to centrifugal force, the material is ejected to the outer rotor and from there onwards, through the output apertures in the base at the bottom, out of the mill
Data Source
Figure 1~2
AI summary
The object of the invention is a mill (20) comprising a housing (1), a lid (2) and a base (3) and inside which mill (20) are two rotors, an inner rotor (4) and an outer rotor (5), rotating in opposite directions, forming a crushing means, in which case material (6) to be crushed is feedable by means of an input pipe (8) to the center of the inner rotor (4), from where, owing to centrifugal force, the material (6) to be crushed moves to the outer rotor (5) and onwards out of the mill (20) via the apertures (7), and in that around the input pipe (8) is another parallel guide pipe (9), in which case the pipes (8, 9) together form an air channel and nozzle for air coming via the aperture (10) to inside the mill (20).