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Circulating tube airflow crusher

    Working principle

    The airflow crusher, cyclone separator, dust collector, and induced draft fan form a complete crushing system. After being filtered and dried, compressed air is sprayed into the crushing chamber at high speed through a Laval nozzle. At the intersection of multiple high-pressure airflows, the material is repeatedly collided, rubbed, and sheared to be crushed. The crushed material moves to the classification zone with the upward airflow under the suction force of the fan. Under the strong centrifugal force generated by the high-speed rotating classification turbine, the coarse and fine materials are separated. The fine particles that meet the particle size requirements are collected by the cyclone separator and dust collector through the classification wheel, and the coarse particles continue to be crushed in the crushing zone.

    Product category

    There are several types of airflow grinders used in China's industry, including flat airflow grinders, fluidized bed jet airflow grinders, circulating tube airflow grinders, jet airflow grinders, and target airflow grinders. Among these types of airflow crushers, flat airflow mills, fluidized bed jet airflow mills, and circulating tube airflow mills are widely used.
    Jet air mill
    After entering the crushing chamber through the spiral feeder, the material is crushed by several relatively arranged nozzles that spray out high-speed airflow impact energy, as well as collision and friction generated by the rapid expansion of the airflow into a fluidized bed suspension boiling. The coarse and fine mixed powder is driven by negative pressure airflow through a turbine classification device installed at the top. The fine powder is forced to pass through the classification device and is captured by a cyclone collector and a bag filter. The coarse powder is thrown towards the four walls by gravity and the centrifugal force generated by the high-speed rotating classification device, and then settles back into the crushing chamber for further crushing.
    Flat airflow mill
    As a high-pressure airflow for crushing kinetic energy, it enters the stabilizing gas storage bag outside the crushing chamber as an airflow distribution station. The airflow is accelerated into a supersonic airflow through the Laval nozzle and enters the crushing and grinding chamber. At the same time, the material is accelerated into the crushing and grinding chamber through the Venturi nozzle for synchronous crushing. Due to the installation of the Laval nozzle at an acute angle with the crushing chamber, the high-speed jet carries the animal material in a circular motion inside the crushing chamber, causing mutual impact, collision, and friction between particles and between particles and the fixed target plate wall, resulting in crushing. Fine particles are introduced into the central outlet pipe of the crusher under the drive of centripetal airflow and collected in the cyclone separator. Coarse powder is thrown towards the peripheral wall of the crushing chamber for cyclic motion and continues to be crushed under the action of centrifugal force.
    Circulating tube airflow mill
    The raw materials are added to the crushing chamber through a Venturi nozzle, and high-pressure airflow is sprayed into a track shaped circulating tube type crushing chamber with varying diameters and curvatures through a set of nozzles, accelerating the particles to collide, collide, and rub against each other for crushing. At the same time, the swirling flow also drives the crushed particles to enter the classification zone upwards along the pipeline. Under the action of the centrifugal force field in the classification zone, the dense material flow is diverted, and the fine particles are discharged after being classified by the louvered inertial classifier in the inner layer. Coarse particles return along the downward tube in the outer layer to continue circulating and crushing.
    Fluidized bed airflow mill
    Airflow pulverizer (fluidized bed type airflow pulverizer) is a device that accelerates compressed air into a supersonic airflow through a Laval nozzle and injects it into the pulverization zone to make the material fluidized (the airflow expands and forms a fluidized bed suspension boiling, colliding with each other), so that each particle has the same motion state. In the crushing zone, accelerated particles collide and crush each other at the intersection of each nozzle. The crushed material is transported to the grading zone by an upward airflow, and fine powder that meets the particle size requirements is screened out by horizontally arranged grading wheels. Coarse powder that does not meet the particle size requirements is returned to the crushing zone for further crushing. Qualified fine powder is collected by entering the cyclone separator with the airflow, and the dust containing gas is filtered and purified by the dust collector before being discharged into the atmosphere.

    Performance characteristics

    Equipped with a vertical grading device, the product particle size D97:8-150 microns can be adjusted, with good particle shape and narrow particle size distribution.
    Can be used in series with multi-stage classifiers to produce products of multiple particle sizes at once.
    The equipment is easy to disassemble and clean, with smooth inner walls and no dead corners.
    The entire system is sealed and crushed, with less dust and low noise, and the production process is clean and environmentally friendly.
    The control system adopts program control, which is easy to operate.

    Performance characteristics

    Equipped with a horizontal grading device, the vertex cutting is accurate, and the product particle size D97:2-45 microns can be adjusted, with good particle shape and narrow particle size distribution.
    Low temperature media free crushing, especially suitable for crushing heat sensitive, low melting point, sugar containing, and volatile materials.
    The equipment is easy to disassemble and clean, with smooth inner walls and no dead corners.
    The entire system is sealed and crushed, with less dust and low noise, and the production process is clean and environmentally friendly.
    The control system adopts program control, which is easy to operate.

    Technical specifications

      MQW03 MQW06 MQW10 MQW20 MQW40 MQW60 MQW120 MQW160 MQW240
    Feed particle size
    mm    		 <3 <3 <3 <3 <3 <3 <3 <3 <3
    Product granularity
    d97:um    		 2～45 2～45 2～45 5～45 5～45 5～45 5～45 5～45 5～45
    Production capacity
    kg/h    		 2～30 30～200 50～500 100～1000 200～2500 500～3500 800～7500 1000～10000 1500～15000
    Air consumption
    m3/min    		 3 6 10 20 40 60 120 160 240
    Air pressure
    Mpa    		 0.7～0.85 0.7～0.85 0.7～0.85 0.7～0.85 0.7～0.85 0.7～0.85 0.7～0.85 0.7～0.85 0.7～0.85
    Installed capacity
    kw    		 21.8 42.5 85 147 282 415 800 1100 1600
    Note: The processing capacity is closely related to the particle size, specific gravity, hardness, moisture and other indicators of the raw materials. The above is for selection reference only.

    Application field

    Widely used in industries such as chemical engineering, minerals, metallurgy, abrasives, ceramics, refractory materials, pharmaceuticals, pesticides, food, health products, and new materials.
    In recent years, with the continuous recognition of the superior performance of ultrafine particles, more and more researchers have begun to pay attention to the research work of fine powder manufacturing. Airflow pulverization technology, as an important method for preparing ultrafine powders, has become one of the preferred methods for developing various high-performance micro powder materials. The product obtained by crushing materials with an air flow mill has uniform fineness, narrow particle size distribution, high purity, smooth particle surface, regular shape, and good dispersibility. The material is less contaminated during the crushing process, and can even achieve a pollution-free and sterile environment, so it can be applied to ultrafine crushing in fields such as food and medicine that are not allowed to be contaminated by external substances.

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