Henan Wanda Industrial Intelligent Equipment Co., Ltd

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The crushing principle of nano sand mill

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2023-06-12

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Do you know how the crushing principle of nano sand mill is? Let's take a look, sand mill mainly uses the squeezing pressure and shear force between grinding media to complete the grinding process, which is characterized by simple principle, large filling rate of raw materials, short retention time, small grinding bin, small grinding media, etc.. It is in you paint, dyes, ink, magnetic materials, fine ceramics, food, powder grinding metallurgical materials and bioengineering and other high-tech fields of product refinement operations.

The basic theory of comminution includes the physics of particle fracture under a given stress, the state of particle fragmentation including deformation and crushing, the impulse of stressed particles in a layer or bed, new surface properties, and so on. Among them, the issues about effective zone, material capture, material internal flow, stress intensity distribution and its control and optimization methods are being further researched and developed at home and abroad.

The completion of the grinding operation of ceramic sand mill depends on the flow and stress phenomenon of the material, the material must flow to some areas in the machine to be stressed and broken, these areas are called the effective zone, which only accounts for a part of the whole grinding machine cavity, such as in the sand mill, the material is only stressed between the two grinding balls, so the contact area is the effective zone; stress intensity can be characterized by the energy per unit mass of material applied to the effective zone, and depends on various parameters, e.g. for grinding with grinding balls as grinding media, on the media movement, filling rate, ball size and the amount of material captured in the effective zone.

In sand mills the grinding media moves in a rotary motion in addition to the translational motion. In addition there is a limit layer around the rotating grinding media. When two grinding media are in close proximity, the fluid in the middle is subjected to a squeezing flow effect.

In terms of stress intensity, the laboratory sand mill uses balls as the grinding media, and the stress intensity of the microprocess between two adjacent balls varies over a wide range depending on the effective zone size and the kinetic energy of the grinding balls moving. The sand mill provides a larger input energy for the micro-process, i.e., smaller grinding balls can be used to increase the effective zone and achieve high comminution effect. Therefore, increasing the stress intensity can lead to higher grinding results. For this reason, the stress intensity is an important indicator of the grinding performance of a sand mill.

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The crushing principle of nano sand mill

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2023-06-12