Airflow grinding can also reduce solid oxidants, explosives, and catalysts, and the combustion rate made of propellants can increase by 1 to 10 times higher than that of ordinary propellants, and improve the hit accuracy and power of the rocket engine. It is extremely important to realize the modernization of defense.
Production of ultrafine powder with airflow mill is one of the main methods of powder processing industries. Since it is produced with a large difference in ultrafine powder, the shape of ultrafine powder is produced. It is also necessary to have special nature, and the finished raw material processed by the airflow pulverizer has the characteristics of fine particle size, narrow particle size distribution, high uniformity, high purity, and high purity, airflow pulverizer is favored by users of various industries.
The high pulverization efficiency of the airflow pulverizer is another major feature, generally no more than 1 minute between the feed and the discharge, the better the brittleness, the more processing efficiency High, but in general, the pulverization efficiency of the airflow pulverizer can also be determined by adjusting its high low. To improve the work efficiency of the flow pulverizer, first, the pulverizer itself and its operating conditions. Let's introduce it to it.
(1) Strictly control the amount of feed: The feed speed should be appropriate, uniform. In addition, what kind of feeding method is also considered, some materials need to be used for spiral board, and some materials need to be oscillated with oscillation, and to determine the material itself. Most importantly, it is to ensure that the energy source in the crushing room is constantly gaining the supply of materials, meets a certain concentration of the material of the crushing indoors. Practice has proved that regardless of the low material concentration, it will have a bad impact on the production of the material concentration to the finished product. The material concentration is low, and the volume of the material is small, the material concentration is high, which will affect the airflow velocity. It is unfavorable to improve, the air pressure, material characteristics, and the characteristics of the body itself, strictly control the feed speed of the material.
(2) Improve the impact probability of air flow velocity and particles. This will be agreed from two aspects. First, the design of the nozzle is reasonable, and the layout of the nozzle is also very important. It can only achieve the purpose of improving the production efficiency can only be achieved by satisfying the requirements of the above two aspects.
The fluidized bed airflow pulverizer in the conventional manner is arranged in parallel to the ring pulverizing chamber, and the gas stream injected from the nozzle is concentrated in the range of an approximate plane, which is narrow, which is not conducive to improving the particles. Impact probability. In addition, this settingThe drawbacks of the plan, also reacted the coarse powder below the nozzle, very few opportunities to be reinprinted to form a blind spot.
The airflow pulverizer breaks the pattern of the conventional setting nozzle. In the same plane of the pulverization chamber, form a certain angle of angle with this plane, respectively, respectively, in addition to a number of nozzles, and in the bottom of the pulverizing chamber, In contrast, set a vertical upward nozzle, with the centerline of the remaining nozzles, together to the same focus. Under the common action of the gas stream injected in all nozzles, the material is formed on the focus, and the material is instantaneously pulverized. In addition, in front of the nozzle, a mixing tube is provided, and there is no blind spot in the pulverizing chamber, and the impact probability of the particles is improved, only this transformation can increase the efficacy of 150 to 200%.
(3) Optimize the hierarchical structure. The grading is a critical part of the airflow pulverizer. A most significant feature of the airflow pulverizer, which can achieve continuous feed and discharge to prevent excessive pulverization of the material, causing unnecessary energy consumption. According to the turbine grading principle, appropriately increase the diameter of the graded wheel, improve the speed, and reduce the air flow is to ensure the fundamental guarantee of the fractional separation particle size. It is necessary to control the relationship between the above three according to the characteristics and specific requirements of different materials.
(4) The original material entering the gas flow crusher should be as small as possible. In order to achieve this, it should be pre-pulverized with ordinary pulverizer before performing ultrafine pulverization, which is the most direct and effective way to save energy and improve the unit production.
(5) Ensuring the airtight requirements of the entire enclosed system of the airflow mill, including a full enclosure of pipes, valves, and equipment, etc., should not have leakage. In summary, you should use precious aerobics, concentrated on the nozzle, and strive to improve gas flow rate and pressure.
(6) Product collection and dust collector should be guaranteed smooth air, should not resist too much. This part of the system device must guarantee the collection of qualified products, but also to ensure the requirements of the environment, not polluting, but the equipment is over, there must be too much burden to the overall work.
The crushing of the gas generating machine is mainly against impact and friction, and this effect is instantaneous, instantaneous impact force acts on object, will be propagated in object in the form of stress wave, input is The impact pressure stress wave, the back reflection produces a stress wave, and propagates in the object, since the formation of the material is much lower than the pressure strength, as long as the stress is greater than the materialTensile strength, object is broken.
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