Jet mill is suitable for crushing flammable, explosive and oxidizing materials

Jet mills are popular in the pulverization of various industries. In order to obtain finer and more concentrated powders, more and more manufacturers choose jet mills to pulverize materials. Typical materials crushed by jet mill are: superhard diamond, silicon carbide, metal powder, etc., high purity requirements: ceramics, pharmaceuticals, biochemistry, etc., low temperature requirements: pharmaceuticals, pvc. By changing the ordinary air of the gas source to inert gases such as nitrogen and carbon dioxide, this machine can be used as an inert gas protection device, suitable for the crushing and classification of flammable, explosive and oxidizing materials.

The materials enter the jet mill from the feed port, and the materials squeeze and collide in the middle of the crushing chamber driven by the air flow. The classifier classifies qualified materials and enters the cyclone collector. The finer tailings are transported to the bag filter by airflow. After filtering through a cloth bag, the tailings enter the outlet of the lower part of the dust collector, and the pure air is emptied. The main engine has no engine parts, no engine and any other transmissions. The high-pressure air generated by the air compressor is released into the main engine through the jet nozzle of the mill. There is no traditional grinding media, such as “milling ring”, “milling ball”, “grinding rail” and other grinding media. Driven by high-pressure air, they collide with each other inside the crusher to achieve the purpose of crushing. There is no traditional long time pressure and friction in the whole crushing process, the material is crushed by its own collision force, and the crushing process does not contact the material of the equipment.

Jet mill is suitable for the crushing of high hardness, high purity, heat sensitive materials, and there is no problem of traditional equipment wear. The main cause of bearing overheating and damage is too much oil, too little or aging. Therefore, according to the quantitative use of lubricating oil, generally lubricating the space of the bearing from 50% to 70%, too much or too little is not conducive to bearing lubrication and heat transfer, and prolongs the service life of the bearing. The supporting bearing cap is fastened to the shaft. If the bearing and shaft are too tight or too loose, the bearing will overheat.

The ultrafine powder produced by jet mill has safety problems such as respiratory tract pneumoconiosis and dust explosion. The particle size of the dust produced by jet mill is basically below 5μm, and the dust below 5μm is harmful to the human body. At the same time, when dust is dispersed in the air to form a dust cloud, a dust explosion may occur. Because the dust particles are not captured during the pulverization process of the jet mill, they have an appropriate particle size and distribution: the general particle size is less than 5μm, the dispersion stability in the air is good, and the explosion limit is easily reached. The consequences of a dust explosion are extremely serious.