Planetary Mixer Blade Geometry to Prevent Material Adhesion
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Solution Overview
Problem
In planetary mixers, materials tend to adhere to the frame-shaped stirring blades during operations like mixing and kneading, requiring frequent scraping, which disrupts continuous operation and can lead to environmental pollution and quality issues like blob and lump formation.
Innovation Solution
The frame-shaped stirring blades are designed with a vertical side portion having two slope faces that slant towards the tank's inner wall, with inward ends far apart and outward ends closer, and an arcuate inner face to prevent adhesion, allowing smooth material flow and reducing the need for scraping, while optimizing the width and angle configurations for efficient mixing and kneading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the frame-shaped stirring blade has a vertical side portion with a flat inner face, then the structure is simple and easy to manufacture, but materials adhere to the inner face requiring frequent scraping
Solution Approach 1:
The inner face of the vertical side portion is designed with a curved surface that slopes downward toward the front end, eliminating flat surfaces where materials can adhere. This curvature prevents material accumulation and facilitates continuous operation without scraping, resolving the contradiction between manufacturing simplicity and productivity.
Solution Approach 2:
Different portions of the vertical side portion are given different surface characteristics: the front end has a sloping curved surface to prevent adhesion, while other portions maintain structural integrity. This localized quality change addresses the adhesion problem without requiring complete redesign of the entire blade.
2Productivity
If the frame-shaped stirring blade has a complex vertical side portion structure with slope faces, then material adhesion is prevented, but the structure becomes more complex
Solution Approach 1:
The curved sloping surface is formed by simple geometric modification of the vertical side portion, creating a smooth transition that prevents material adhesion. This curvature approach achieves the anti-adhesion function without requiring complex multi-component structures.
Solution Approach 2:
The surface geometry of the vertical side portion is modified by changing parameters such as the slope angle and curvature radius. These parameter adjustments create optimal flow conditions that prevent material adhesion while maintaining manufacturing feasibility.
3Force
If the inward ends of the vertical side portion are close to the tank wall, then the mixing action is strong, but materials adhere to the stirring blade
Solution Approach 1:
The curved sloping surface at the front end of the vertical side portion creates a flow pattern that prevents materials from adhering to the blade surface, even when the blade is positioned close to the tank wall for strong mixing action.
Solution Approach 2:
The vertical side portion combines multiple surface characteristics: a curved anti-adhesion surface at the front end and potentially different surface properties at other portions, creating a composite structure that simultaneously achieves strong mixing and prevents adhesion.
4Manufacturing precision
If scraping operation is performed frequently to remove adhered materials, then material quality is maintained, but continuous operation is disrupted and environmental pollution risk increases
Solution Approach 1:
The curved surface geometry is designed in advance to prevent material adhesion before it occurs. This preliminary preventive design eliminates the need for subsequent scraping operations, maintaining both material quality and continuous operation.
Solution Approach 2:
The design converts the potential harm of material adhesion into a beneficial flow pattern where materials smoothly follow the curved surface. The sloping curved surface transforms what would be an adhesion problem into a flow enhancement feature.
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 prevents material adhesion, allows for continuous operation without scraping, reduces the risk of environmental pollution, and ensures efficient and homogeneous mixing and kneading, producing high-quality pastes without blob or lump formation.
Implementation Method 1
a part of the materials in the tank is pressed by a forward side face located at the front face side relative to the direction of movement of the vertical side portion 3 and made to flow in an outward direction (radial direction) along a forward slope face 5
Implementation Method 2
the edge face 7 of the vertical side portion 3 comes close to the inner wall of the tank 2, and shearing stress is applied to treatment materials between the edge face and the inner wall of the tank to conduct the treatment such as a mixing/kneading operation
Implementation Method 3
the inner face is formed in an arcuate configuration, by which the above problems can be solved... improvement of flow is caused for the materials and adhesion and fixing of the materials to the stirring blade can be prevented
Data Source
AI summary
A planetary mixer has stirring blades that undergo planetary motion within a tank in close proximity to an inner wall of the tank for stirring solid/liquid type treatment materials received by the tank. Each of the stirring blades includes a vertical side portion having two slope faces slanting toward the inner wall of the tank, an edge face connecting outward front ends of the slope faces, and an inner face connecting inward front ends of the slope faces. The outward front ends are disposed closer to the tank inner wall than are the inward front ends, with a distance between the inward front ends being greater than a distance between the outward front ends. The inner face is formed in the shape of an arc having a center located at an intersection of a line interconnecting the inward front ends and centerline running through a center of the edge face.