Flat Burr Grinder Millstone Inserts for Energy and Heat Control
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Solution Overview
Problem
Existing grinding stone arrangements for disc grinders in the food sector face challenges in achieving high grinding performance with reduced energy consumption and minimizing material temperature increase during comminution of granular materials.
Innovation Solution
A grinding stone arrangement featuring a fixed stator disc and a driven rotor disc, both made of natural or artificial stone, with inserts of ceramic, metal, or plastic materials, structured with teeth and a conical design to pre-crush material before fine grinding, allowing for adjustable grinding gaps and efficient energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional grinding stone arrangements are used, then grinding function is provided, but energy consumption is high and material temperature increases during comminution
Solution Approach 1:
The grinding discs are segmented into different functional zones: a pre-grinding zone with coarse structure for initial size reduction, and a fine grinding zone with finer structure for final particle size achievement. This segmentation allows each zone to perform its specific function efficiently, reducing overall energy consumption while maintaining high productivity.
Solution Approach 2:
Different regions of the grinding disc have locally optimized properties: the pre-grinding area has coarser structures for aggressive size reduction, while the fine grinding area has smoother surfaces for precise particle size control. This local quality differentiation enables the system to achieve high grinding performance with reduced energy input compared to uniform grinding surfaces.
2Temperature
If conventional grinding stone arrangements are used, then grinding function is provided, but material temperature increases during comminution
Solution Approach 1:
The grinding process is segmented into pre-grinding and fine grinding stages, allowing heat generation to be distributed and managed in zones. The pre-grinding zone handles the most intensive size reduction where heat generation is highest, while the fine grinding zone operates at lower intensity, preventing excessive temperature rise while maintaining overall grinding effectiveness.
Solution Approach 2:
The rotating grinding disc creates periodic contact between material particles and grinding surfaces, with alternating phases of compression and release. This periodic action prevents continuous frictional heating, allowing heat dissipation between contact cycles and maintaining lower material temperatures during the grinding process.
3Reliability
If grinding discs are made of natural or artificial stone, then wear resistance is achieved, but grinding efficiency is limited
Solution Approach 1:
The grinding disc combines natural or artificial stone base material with strategically positioned inserts made of different materials (metal, ceramic, or plastic) having superior hardness and wear resistance. This composite construction allows the stone to provide structural integrity and basic grinding function, while the inserts provide enhanced wear resistance and localized cutting action, significantly improving grinding efficiency without sacrificing reliability.
Solution Approach 2:
Rather than making the entire grinding disc from high-wear-resistance material, inserts of hardened metal, ceramic, or plastic are placed only in specific high-wear zones such as the pre-grinding area and at the periphery. This local quality approach provides enhanced wear resistance exactly where needed, improving grinding efficiency in critical areas while maintaining the cost-effectiveness and structural properties of the stone base material.
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 solution enables effective pre-crushing and fine grinding of materials with reduced energy consumption and minimized temperature increase, enhancing the overall grinding performance while maintaining efficient comminution of granular materials in the food sector.
Implementation Method 1
The rotor grinding disc (20) rotates about a vertical rotation axis (L) in a clockwise direction, viewed from above, in the direction of the arrow (R). The visible grooves of the toothing (21) receive the material to be ground (30), which is moved outwards by the rotational movement of the rotor (20) in conjunction with the resulting centrifugal forces
Implementation Method 2
The visible grooves of the toothing (21) receive the material to be ground (30), which is moved outwards by the rotational movement of the rotor (20) in conjunction with the resulting centrifugal forces and enters the remaining grinding gap (4) between the stator grinding disc (10) and the rotor grinding disc (20) for fine grinding
Data Source
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AI summary
The invention relates to a millstone arrangement for a flat burr grinder for grinding material to be ground, in particular granular material in the field of foods, consisting of a fixed stator grinding disk and a driven rotor grinding disk, which are arranged one over the other concentrically in such a way that there is a grinding gap, wherein the stator grinding disk has a central opening for feeding the material to be ground and the grinding disks consist of a natural or artificial stone material. According to the invention, the stator grinding disk has a first insert in the region surrounding the opening for feeding material to be ground, which first insert is connected to the grinding disk and is directed toward the center of the opening and toward the grinding gap. Furthermore, the rotor grinding disk has a second insert, which is connected to the rotor grinding disk for conjoint rotation and which has the shape of a cone or a cone frustum in a longitudinal section, wherein the cone tip or cone frustum tip protrudes into the opening for feeding material to be ground and the first and the second inserts have a structure, in the sense of a surface structure, on the surfaces thereof that are directed toward the grinding gap and/or toward the opening.