Preliminary Size Reduction Device for Ball Mill Jamming
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Solution Overview
Problem
Existing preliminary size reduction devices for ball mills and agitator ball mills face issues with jamming of coarse particles and impurities, which hampers efficient size reduction of grinding stock.
Innovation Solution
A preliminary size reduction device featuring a stationary size reduction ring with an inner toothing system and a rotationally mobile size reduction means with a coarse outer toothing system, including a truncated cone-like region, is positioned between the grinding stock inlet and the grinding chamber, forming a size reduction gap that minimizes dead space and prevents jamming through a combination of fine and coarse toothing systems and tapering tooth shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a preliminary size reduction device with a size reduction gap is used, then the preliminary size reduction of grinding stock is improved, but coarse particles and impurities may jam in the device
Solution Approach 1:
The size reduction means is divided into multiple regions (first region with first outer toothing system, second region with second outer toothing system) that perform different functions. The first region handles fine size reduction while the second region with larger teeth and curved surfaces handles coarse particles and prevents jamming, allowing the device to simultaneously achieve precise size reduction and reliable operation.
Solution Approach 2:
Different regions of the size reduction means have different local properties: the first region has finer teeth for precise size reduction, while the second region has larger teeth with curved surfaces that widen toward the free end to prevent jamming of coarse particles. This local differentiation allows each region to optimize its function while working together as a unified system.
2Productivity
If the size reduction gap is minimized to improve size reduction efficiency, then productivity increases, but dead space is reduced which may cause jamming
Solution Approach 1:
The size reduction means is segmented into regions with different tooth configurations. The first region maintains a minimized size reduction gap for high efficiency, while the second region with larger teeth and curved surfaces creates necessary dead space to prevent jamming, allowing both productivity and reliability to be optimized simultaneously.
Solution Approach 2:
The second outer teeth have curved surfaces that widen in a radial direction toward the free end, creating three-dimensional space that prevents jamming without significantly increasing the overall size reduction gap. This dimensional approach allows the device to maintain high efficiency while preventing particle accumulation.
3Reliability
If a coarse outer toothing system with larger teeth is used to prevent jamming, then reliability improves, but the precision of size reduction may be compromised
Solution Approach 1:
The size reduction means is divided into functional regions: the first region with finer teeth performs precise size reduction, while the second region with larger coarse teeth prevents jamming. This segmentation allows the device to achieve both precision and reliability without compromising either function.
Solution Approach 2:
The second region with larger teeth performs preliminary action by preventing jamming and guiding particles before they reach the finer first region. This preliminary protection ensures that the precision size reduction in the first region is not compromised by particle accumulation or jamming.
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 device effectively reduces coarse particles and prevents jamming, ensuring efficient introduction of grinding stock into the grinding chamber by creating a better pumping effect and turbulence, thereby enhancing the preliminary size reduction process.
Implementation Method 1
a size reduction gap is formed between the first size reduction means constituted stationary and the first sub-region of the second size reduction means
Implementation Method 2
The first sub-region of the second size reduction means comprises a first outer toothing system. The first size reduction means and the second size reduction means are disposed in such a way that the outer toothing system of the first sub-region of the second size reduction means for the most part engages into the inner toothing system of the first size reduction means
Implementation Method 3
ensuring efficient introduction of grinding stock into the grinding chamber by creating a better pumping effect and turbulence
Implementation Method 4
creating a better pumping effect and turbulence, thereby enhancing the preliminary size reduction process
Data Source
AI summary
A preliminary size reduction device for a ball mill or agitator ball mill and a ball mill with a preliminary size reduction device, wherein the preliminary size reduction device is disposed between a grinding stock inlet of the ball mill or agitator ball mill and a grinding chamber and includes a first size reduction mechanism constituted stationary and a second, rotationally mobile size reduction mechanism, between which a size reduction gap is formed. The first size reduction mechanism constituted stationary is a size reduction ring disposed in the grinding container.