The Application of High Pressure Pulverizer Grinding Mill
This grinding mill is mainly applied for the powder processing of mineral products in the industries of metallurgy, construction materials, chemical, and mining, etc. It can produce powder from various non-flammable and non-explosive mineral mateirals with Mohs hardness below 9. 3 and humidity at 6%, such as quartz , feldspar, calcite, talcum, barite, fluorite, xircon, cinder, cement grappier, cement clinker, activated carbon, dolomite, granite, soft coal, coking coal, lignite, magnesia, chromium oxide green, gold ore, red clay, clay, bolus alba, coke, coal gangue, porcelain clay, kyanite, fluor-spar, bentonite, medicinal stone liparite, diabasc, pyrophyllite, shale, red stone, emeraldite, basalt, gypsum, graphite, carborundum, heat insulating material, etc.
The Six Key Features of High Pressure Pulverizer Grinding Mill
Compared with other pulverizers under the same power conditions, the output of this machine is increased by 20-30%. Under the performance of highpressure springs, the rollers grinding pressure on raw mateaials is raised by 800-1200kg.
All the mineral materials with Mohs hardness below 9. 3 can be crushed.
The finished powder has a wide range of particle size from the maximum particle diameter of 0. 613 mm(30 mesh)to the finest diameter of 0. 013 mm(1000 mesh)
While the normal particle diameter is around 0. 033mm(425 mesh).
Its dust-removing effect exactly meets the National Dust Discharge Standard.
The classifier is easy for adjustment.
The grinding unit adopts a superposition multi-grade sealing with good sealing performance.
The Oparating principle and characreristics of the Whole System
The whole system of 9518 high-pressure pulverrizer grinding mill consists of main units, Classifier, piping device, blower, jaw crusher, dustpan elevater, electrom agnetic vibration, feeder, and electric-control motor, etc. (For details, please refer to the Installation Foundation Diagram. )
The whole operating process of the pulverizer(the crushing process of raw material)is illustrated as follows:The lump material is firstly crushed by the jaw crusher into the required partical size. Then the crushed material is transferred to a hopper by the elevator and fed uniformly, quantitatively and continously by the vibration feeder into the grinding chamber of the main unit for pulverizing. The pulverized particles are brought up by the air current of the blower into the classifier for classification. The particles with the required fineness go with are brought up by the air current though the pipes into a cyclone collector for separation and collection and the finished particles are discharged from a pipe outlet, The air current is inhaled into the blower through the return pipe on the top of the cyclone collector. The air current of the whole system is in a sealed circulation under the condition of the positive and negative pressure.
Due to some moisture contained in the material to be pulverized in a grinding chamber, the heat resulting from grinding leads to the vaporzed air which changes the airflow volume, Moreover, the outside air inhaled from the narrow gaps of the piping connections can increase the volume of air current. Therefore, it is necessary to adjust the redundant air pipe between the blower and the main unit for keeping the balance of the air current. The redundant air is then guided into a cloth bag of a dust cleaner to collect the fine powder in the air. And the redundant air discharged after purification.
The main unit runs with a central shaft that is driven by a transmission device. The top of the shaft is connected with a quincunx stand, on which a grinding rooler is installed to form a swing support. The grinding roller not only rotates around the cernter and the grinding ring, but also rotates around its own axis due to the friction. A relieving tool is intalled under the quincunx stand, just located at the lower end of the grinding roller, when the relieving tool and the grinding roller rotates simultaneously, the mineral material is spaded up and fed into the room between the roller and ring to form a layer of feeding material. Such a layer of feeding material generates an outwardc entrifugal force(crushing force) through the grinding rollers rotation to crush the material into powder.
The classifier performs the function of classifying the particles by the rotation of blades on the disk driven by a speed-adjustable motor. The rotation speed of the blades is regulated according to the particle size of the finished powder. In order to realize a finer particle size, the rotation speed should be raised up to increase the contact between the blades and powder particles. The powder particles that do not meet the requirement are thrown by the blades to the outer wall and separated form the air current. The coarse particles drop because of self-gravity into the grinding chamber for regrinding. The qualified particles go through the blades and are inhaled by the air current into the cyclone collector . Then the particles are separated from the air current and collected.
The cyclone collector plays an important role in the performance of the pulverizer grinding mill. When the air current with the powder enters the collector, it is at a high speed of rotation. After the air current is separated from particles, and when the air current concentrates towards the center along the cone wall and moves to the bottom of the cone(the natural length of the air current), an upward rotating air column is formed. Meanwhile, the particles are separated and fall down for collection. Because the core of the upward rotating air current is in state of negative pressure, the lower part of the collector must meet a very strict requirement of sealing and be is olated entirely from the outside air. Otherwise, the collected particles will be taken away by the central air current, which will directly influence the output of the complete system. Therefore, a powder-locking unit in installed under the collector. Its function is to isolate the outside positive pressure air from the negative pressure air inside the collector. This is a very important component. If the powder-locking unit is not installed, or the powder-locking unit has not strict sealing, the output of the complete system will be seriously influenced with no or less production of the finished powder.
Features of Whole System:
The whole pulverizer is of a standing structure and characteristic of a small occupying space and strong integration capability. It can form up an independent production system from lump material crushing to finished powder and packaging.
All the finished particles produced by the pulverizer have a good uniformity of fineness. 99% of the particles can meet the required fineness and go through the sieve, i. e. The passing rate is 99%. This is the advantage that other power grinding equipment cannot exceed.
The transmission device of the main unit is equipped with a closed gearbox and pulle that runs smoothly and reliably. The key components of the pulverizer are made of best quality steel, so the whole system is durable, stable, and reliable.
The electrical system of the pulverizer is centrally controlled and the advanced model is rationally selected. Basically, an unmanned operation can be realized in the pulverizing workshop. The lightweight and compact vibration feeder can feed the material uniformly. It is easily adjustable, energy saving and convenient for operation and maintenance.
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