The sand mill is the most widely used, most advanced and most efficient grinding equipment. The grinding chamber is the narrowest, the gap between the levers is the smallest, the grinding energy is the most dense, and the high-performance cooling system and automatic control system can realize continuous material. Continuous processing of the material greatly improves the production efficiency.
The sand mill can be divided into disc type, rod pin type and rod disc type according to the structure shape of the stirring shaft; according to the arrangement form of the grinding barrel, it can be divided into vertical type and horizontal type; according to the volume of the cylinder body, it can be divided into laboratory and small , medium, large, super large (or according to the volume is divided into 0.5l, 1L / 30L, etc.); according to the medium separation method can be divided into static, dynamic separation sand mill;
China's sand mill design and manufacturing originated from the vertical development into a horizontal sand mill in the 1960s, and now most of the market is a horizontal sand mill.
The sand mill originated from the ball mill in the world. The sand mill is an improved version of the ball mill. The ground material is finer and the particle size distribution is more uniform.
The basic structure of the sand mill includes: grinding cylinder, rotating shaft, agitator, etc., when the grinding cylinder is filled with a certain amount of grinding medium, and then sent to the cylinder for grinding according to the flow rate specified by the production process.
The working principle of the sand mill: the working principle is that the solid-liquid mixture material after pre-dispersion and wetting treatment by the mixer is input into the cylinder body by the material pump, and the material and the grinding medium in the cylinder body are stirred together by the high-speed rotating disperser, thereby The solid particles and the grinding medium in the material are more strongly collided, rubbed and sheared with each other, and the purpose of accelerating the grinding particles and dispersing the aggregates is achieved. The ground material after grinding is separated by a dynamic separator to separate the grinding medium and flow out from the discharge pipe.
Effect of sand mill working parameters on grinding materials
The flow rate of the sand mill affects product fineness, yield and particle size distribution.
The media size affects the grinding efficiency and product fineness.
The agitation axis speed affects the grinding efficiency, material fineness and wear.
The specific gravity of the medium affects the grinding efficiency and product fineness.
The media fill rate affects the grinding efficiency and product fineness.
Sand mill use and operation methods?
There are four types of sanding machine grinding processes: single machine continuous grinding, series grinding, combined cycle grinding, and single barrel circulation grinding.
The single-machine continuous grinding process is generally used for products with less fineness requirements. Such as: metal mines, non-metallic mines, automotive primers, etc.
Tandem grinding is a continuous grinding application for products with higher fineness requirements. Such as: offset ink, chemical fiber matting agent, calcium carbonate and so on.
The combined cycle grinding process is a combination of continuous grinding and cyclic grinding. The purpose of the first small-flow grinding is to break up the coarse particles, and cycle grinding from the second pass, the product has a narrow particle size distribution. Generally used in the production and polishing of automotive topcoats.
The premise of the single barrel cyclic grinding process is that the number of cycles must be greater than 5, and a stirrer is arranged on the circulating barrel to ensure that the materials are thoroughly mixed to avoid dead angles in the circulating barrel. The grinding process has the advantages of simple operation and low equipment investment. Generally used in the printing of inks, ceramic materials, silicon carbide, silicon nitride, boron carbide and other materials.
With the continuous development of nanotechnology, fine, fast and less pollution will be an important issue for the new generation of dispersion grinding technology. At present, nanotechnology has been widely used in the optoelectronic industry, electronics industry, pharmaceutical biochemical industry, chemical weaving industry, building materials industry, metal industry and other fields. The minimum fineness of the Rujia Nano series sand mill can reach 100 nanometers. If you want to do something good, you must first sharpen it. The production of nanomaterials must first find a good dispersion and nano-grinding equipment
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