gbw-animation Pressure Diagram

 

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Diagrams of the Pressure Distribution in the Gap

The pressure sensor in the roller is used to measure the pressure distribution in circumferential direction. The resulting pressure diagrams are shown below. The granular structure of the material bed causes that the pressure diagrams are not showing a smooth curve but a curve with statistcal variations. This effect increases with increasing particle size and decreasing grinding force.

 

The following links will lead you to some typical examples for pressure diagrams at a roller speed of u = 0.3 m/s and a normalized axial coordinate l = 0.19:

For further discussions the average curves of 10 to 15 single pressure diagrams are used. Two examples are given here:

Comminution
grinding results for different materials

Throughput
characteristic of different rollers

Pressure Distribution
literature pressure distribution, pressure diagrams, peripheral pressure distribution, axial pressuredistrib., effective pressure and specific grinding force, compression angle and specific throughput

Pressure diagrams
number of tests, quartz 1, quartz 2, quartz 3, limestone 1, limestone 2, limestone 3

Press Tests
tests with a molding press

Modelling
mathematic model of the process

Signs and Symbols
nomenclature

Measurement of the pressure distribution in the gap of a lab-scale High Compression Roller Mill / Institute for Mineral Processing of the TU Clausthal (Germany, 1989)

The average pressure diagrams are almost smooth curves with the exemption of the coarsest fraction. In the following discussions only those average pressure diagrams are used to determine compression and relaxation angle because the statistical variations for the single pressure diagrams are significant.

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