VSFJ SERIES TURBO AIR CLASSIFIER

• Introduction

VSFJ series turbo air classifier is produced by Dongguan Vsunny Machinery Co., Ltd. to solve the problems of poor classification effects and low yield of domestic ordinary classifiers. Learning the design from German Alpine and Ecutec S.L., combined with its self-produced VSLM series ultrafine vertical mill classifying technology, the company has developed an industrial leading turbo-type air classifier which can sort 1.5~30μm, and its 2μm content can reach up to 80%.
 

• Specifications

Model	VSFJ－3/350	VSFJ－4/350
Number of classifier	3	4
Classifier power	11KWx3	11KWx4
Particle fineness D97 (μm)	3～60	3～60
Process capacity	4～6	5～7
Percentage of output in 2μm	50～90%	50～90%

• Application

VSFJ series turbo air classifier has a wide range of applications, such as ground calcium carbonate, light calcium carbonate, talcum, barium sulfate, wollastonite, pyrophyllite, dolomite, graphite, kaolin, brucite, soapstone and other types of non-metallic mineral powder.

• Principle

    The feed screw conveyor will put the powder materials stored in the hopper in the airflow transport duct at a constant flow rate by a computer, and mix the powder with the main stream before entering into the classifier. The main air stream with powder will enter into the volute chamber firstly at the bottom of the classifier, and uses both the vortex force of the main stream in the volute chamber and the centrifugal force generated by the rising secondary air stream in the pre-classifying chamber to make pre-classifying. Coarse particles are first sorted out.
    Coarse powder which had not entered into the pre-classifying chamber will fall from the bottom of the classifier, which are the low-end powder after classification. The secondary air stream sucks from the bottom of the pre-classification chamber and picks the remaining fine powder from the coarse one. The remaining air stream containing finer powders are brought into the final classification zone, in which the outlet is equipped with an automatic classifier having three or more classifier for final classification. In this classification zone, the powder is under the action of the centrifugal force, fluid resistance, and its own gravity. Powder which is larger than the classifier convergent point will be sent back to the pre-classification chamber, while powder which is smaller than the convergent point will be brought out of the classifier along the air stream. The blower brings the fine powder from the classifier and becomes the finished product collected by the jet bag filter machine. Part of the gas will be discharged from the exhaust pipe of the device into the atmosphere, in order to maintain the whole classifying system's temperature above the dew point in normal operation, whilst the remaining air is recycled as the main airstream. Collected by the bag filter, fine powder and coarse powder in the pre-classification chamber will be delivered to the designated different product hopper by the pneumatic conveying system, according to their specifications. The packing machine is disposed below the finished product hopper.
 

• Advantages

    1. Accurate particle size distribution. Maintain a narrow particle size distribution through adjustment and control operations according to the convergent point required.
    2. The product is stable, continuous and reliable. The fineness of the product can be adjusted freely by adjusting the rotating speed of the classifying wheel through frequency converter or adjusting the opening of the air valve. The adjusting of the product variety is easy and convenient, continuous and stable. 
    3. Support large scale of industrial classification production. Designed with mighty vortex classification principle and the classifying impeller located horizontally with single impeller or multiple impellers structure, the classifier is particularly suitable for large-scale industrial classification production of 400~8000 mesh micro powder.
    4. Independent system can be established for independent purpose. Suitable for directly connecting various grinding equipment (such as ball mill, impact mill, vibration mill, vertical roller mill, air jet mill, and stirring mill, etc.) to form a closed-circuit continuous ultrafine production system. 
    5. A full set of classifier system with PLC touch screen intelligent control, showing real-time, adjustable and controllable parameter, index, temperature, production volume, fineness, etc. With mature technology, our classifier can realize a perfect docking with the vertical mill system and ball mill control system, or establish an independent central control system.