Segmented Grinding Tool Edges for Turbulent Flow Control
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Solution Overview
Problem
Existing feed material crushing devices face challenges in achieving economical comminution with consistently high quality, particularly when processing heat-sensitive materials, as they often result in inefficient heat input and limited fineness of the end product.
Innovation Solution
The modification of the rotor's grinding tool edges to create varying radial distances and vortex axes, generating complex turbulent flow conditions that enhance comminution efficiency, allowing for coarser feed material input without compromising fineness, and reducing tool change times through targeted material flow control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotor's grinding tool edges are modified to create varying radial distances, then comminution performance increases, but device complexity increases
Solution Approach 1:
The axially extending effective edge of each grinding tool is segmented into multiple subsections (first subsections L1 and second subsections L2) with different radial distances from the rotor axis. This segmentation creates distinct vortex generation zones that improve comminution performance while maintaining a relatively simple overall tool structure.
Solution Approach 2:
Different subsections of the grinding tool edge are assigned different radial distances (R1 for first subsections, R2 for second subsections) to create localized variations in vortex intensity and material flow patterns. This local quality variation enhances comminution efficiency without requiring complete redesign of the entire grinding tool.
2Temperature
If the residence time of feed material in the grinding zone is reduced, then heat input to feed material is minimized, but comminution efficiency may be compromised
Solution Approach 1:
The varying radial distances of grinding tool edges create complex, turbulent vortex flows that intensify mechanical comminution forces. This turbulent flow regime enhances particle breakdown efficiency within shorter residence times, allowing reduced heat input while maintaining comminution effectiveness.
Solution Approach 2:
The invention creates multiple vortex structures with different orientations (axially extending and radially extending vortices) that work synergistically to enhance comminution. The superposition of these vortex patterns intensifies the comminution process per unit time, enabling shorter residence times.
3Ease of operation
If coarser feed material is fed into the device, then material handling is simplified, but achieving fine comminution becomes more difficult
Solution Approach 1:
The complex turbulent vortex flows generated by the varying radial distance configuration create intense mechanical action that effectively breaks down coarser particles. The turbulent eddies and varying flow velocities enhance particle-collision frequency and impact forces, achieving fine comminution from coarser feedstock.
Solution Approach 2:
The vortex field acts as a fluid dynamic system that transports and processes particles through controlled air flows. The varying radial distances create differential pressure zones and flow velocities that enhance particle suspension, collision, and breakdown, enabling effective comminution of coarser materials.
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 approach significantly increases comminution performance, minimizes heat input, and ensures high-quality, uniform particle size, making the process more economical and efficient for both heat-sensitive and non-sensitive materials.
Implementation Method 1
When the rotor rotates, the grinding plates, with their axially extending edges, generate a vortex field in which the material particles are constantly accelerated and deflected
Implementation Method 2
This significantly increases the efficiency of the comminution process, which initially manifests itself in an unexpectedly high increase in the performance of a device according to the invention
Implementation Method 3
the superposition of differently oriented vortices results in extremely complex turbulent flow conditions in the spaces between two adjacent grinding tools
Implementation Method 4
Due to the high peripheral speed of the grinding tools, a vortex field is generated in which the material particles are subjected to high impact and shear forces, resulting in the fine comminution of the feed material
Data Source
Figure 1~2
Figure 3
Figure 4a~4d
AI summary
The invention relates to a device and a plate-shaped grinding tool for grinding feed material. The device has a housing (6) extending along an axis of rotation (7) in which a rotor (11) is arranged and driven to rotate about the axis of rotation (7). The rotor (11) has a plurality of axially parallel grinding tools (20; 20.1, 20.2, 20.3) around its circumference, which are surrounded by a stator with stator tools (35). The effective edges of the grinding tools (20; 20.1, 20.2, 20.3) are arranged at a radial distance from the stator tools (35), forming a grinding gap (36), and extend over the axial length of the grinding gap (36). The feed material (37) is fed into the grinding gap (36) on the inlet side and exits the grinding gap (36) on the outlet side.To achieve economical comminution operation with consistently high end product quality, the invention proposes that the axially extending effective edges (25) of the grinding tools (20; 20.1, 20.2, 20.3) are each subdivided in the axial direction into at least two first subsections L1, each with a first radial distance R1 from the axis of rotation (7), and into at least one second subsection L2 with a second radial distance R2 from the axis of rotation (7). The second subsection L2 is arranged between the at least two first subsections L1, and the first radial distance R1 is greater than the second radial distance R2. Furthermore, the axially extending effective edges (25') of the at least two first subsections L1 and the axially extending effective edge (25") of the at least one second subsection L2 are connected to each other via transverse or substantially radially extending effective edges (26).