[0017] The present invention will be further described below in conjunction with the drawings and embodiments.
[0018] See figure 1 The powder preparation device shown includes an ultra-fine pulverizer 1, a cyclone dust collector 2, a bag filter 3, and an induced draft fan 4.
[0019] See figure 2 The superfine pulverizer 1 shown includes a housing 12, a feeding pipe 5 connected to the housing for feeding pre-pulverized materials into the pulverization chamber, a discharge port 6, and an air inlet chamber 7 with a lower part in the housing. , The upper crushing and classification chamber 8.
[0020] The crushing and classification chamber 8 includes a crushing chamber 81 and a classification chamber 82. A classification impeller 9 is provided in the crushing and classification chamber 8. The upper part of the classification impeller is a classification chamber 82, and the lower part is a pulverization chamber 81. A crushing disc 10 is provided in the crushing chamber. A blade 11 is provided on the crushing disc; a shunt ring 17 is arranged between the crushing disc and the grading impeller. The classifying impeller 9 is connected to the classifying shaft 13 passing through the classifying chamber, and the upper part of the classifying shaft 13 is connected to the classifying motor 14. The crushing disc 10 is connected to a crushing rotating shaft 15 passing through the air inlet chamber, and a crushing pulley 16 is fixed at the lower end of the crushing rotating shaft. The crushing pulley 16 is connected to the crushing motor 18 through a belt. The axes of the crushing rotating shaft 15, the crushing disk 10, the classifying rotating shaft 13, and the classifying impeller 9 are all coincident.
[0021] The outlet of the feeding pipe 5 is in the center of the split ring and communicates with the crushing chamber 81. A control valve 51 for controlling the flow of materials is provided on the feeding pipe. The discharge port 6 is opened on the upper side of the classification chamber.
[0022] The inlet of the screw conveyor (slag removal device) 100 fixed on the casing of the superfine grinder is at the inner wall of the casing outside the shunt ring, and the slag outlet 101 of the screw conveyor is below the middle of the screw conveyor. The drive motor 102 operates to discharge materials that cannot be crushed from the crushing chamber.
[0023] The discharge port 6 of the superfine grinder is connected to the side air inlet 21 of the cyclone dust collector 2, and the upper air outlet 22 of the cyclone dust collector is connected to the side air inlet 31 of the bag dust collector 3; The air outlet 32 is connected to the induced draft fan 4.
[0024] The crushing disc 10 and the blade 11 are driven by the crushing pulley 16 and the crushing rotating shaft 15 to rotate at a high speed. The material is injected into the crushing chamber through the feeding pipe 5, and the material is fluidized, and it collides, rubs, and shears violently with the high-speed rotating crushing disc and blade 11. The crushing disc (and blade) will feed the material into the feeding pipe Crush into fine powder to complete the ultrafine crushing of the particles. The crushed material is transported into the classification chamber 82 by the rising air flow from the air inlet chamber 7 into the crushing chamber 81. The grading impeller 9 which rotates driven by the grading motor 14 and the grading shaft 13 divides the fine powder into fine powder with qualified particle size and coarse powder with unqualified size, and the qualified fine powder is sucked out through the discharge port 6 through 4. In other words, under the action of the centrifugal force of the grading impeller and the suction force of the induced draft fan, the separation of coarse and fine powder is realized. The unqualified coarse powder falls back to the crushing chamber along the inner wall of the shunt ring 17 due to its own gravity, and continues to be crushed until it reaches a qualified particle size.
[0025] The qualified fine powder enters the cyclone dust collector 2 through the discharge port 6 along with the airflow. The qualified fine powder descends while rotating along the inner wall of the cyclone dust collector, and is finally discharged from the discharge port 23 at the lower part of the cyclone dust collector. The qualified micropowder is obtained. The dust-containing gas containing fine dust smaller than the qualified fine powder is sucked into the side air inlet 31 of the bag filter 3 through the upper air outlet 23 of the cyclone dust collector. The fine dust collected by the bag filter 3 is periodically discharged from the discharge port 33 at the lower part of the bag filter 3. The gas purified by the bag filter 3 is drawn from the air outlet 32 of the bag filter by the induced draft fan 4 and discharged through the discharge duct 41 of the induced draft fan.
[0026] The crushing disc and the classifying impeller are respectively driven by two concentric crushing rotating shafts and the classifying rotating shaft through the crushing pulley and the classifying motor. The speed of the grading impeller is adjustable to adjust the particle size of the product.
[0027] The ultrafine grinder can simultaneously complete the two powder processing procedures of material crushing and fine powder sorting. When the superfine grinder is working, the discharge port is connected with the induced draft fan through the cyclone dust collector. The crushing disc (and blade) in the crushing chamber is used to crush the material fed by the feeding pipe into fine powder; the grading impeller divides the fine powder into fine powder with qualified particle size and coarse powder with unqualified size, and the qualified fine powder is discharged The material port enters the cyclone dust collector, and the qualified small fine powder is collected through the receiving port at the lower part of the cyclone dust collector to obtain the required fine powder. The dusty exhaust gas is discharged by the induced draft fan. In the superfine pulverizer, the crushing disc and the grading impeller are respectively driven by two concentric shafts, and the speed of the grading impeller is adjustable to adjust the particle size of the product. The unqualified coarse powder falls back to the crushing chamber along the inner wall of the shunt ring, and continues to be crushed until it reaches the qualified particle size. The material is crushed and sorted by an ultra-fine grinder. Because the parts that are in direct contact with the material such as the crushing disc, blades, etc., have high hardness and little wear, no impurities or only a very small amount of impurities enter the material; at the same time; , The powder is collected by a cyclone dust collector, and no impurities will enter. In addition, the pulverizing disc, blades and other parts of the ultrafine pulverizer are very small; and the cyclone dust collector is basically not worn, so the preparation device has a long service life and is not easily damaged. The invention is especially suitable for ultrafine grinding of materials with Mohs hardness less than 6, such as calcium carbonate, talc, bauxite, kaolin, quartz, calcite, barite, dolomite, mica, etc., and can obtain 200-4000 mesh It has a wide application range, low energy consumption, long service life and convenient maintenance.
