1、 Overview
The CWFJ series ultrafine air classifier is an ultrafine grading equipment introduced by our company with advanced foreign technology, suitable for grading low to medium hardness ultrafine powder materials. Its performance indicators have reached international standards for similar models. In 2004, the product passed the provincial new product appraisal and won the Zhejiang Province and Shaoxing City Science and Technology Progress Award. And it has been listed as a national torch plan project. This machine is equipped with secondary air intake and high-precision turbine, which can obtain fine materials as fine as 3 microns. The rotor made of special materials can grade high hardness materials, and is widely used in industries such as chemical, pharmaceutical, food, non-metallic minerals, etc. for particle separation, iron removal, and selection in ultrafine powder processing.
2、 Purpose and Characteristics
The CWFJ series ultrafine air classifier is suitable for particle separation, iron removal, fiber removal, and selection in powder processing in industries such as chemical, pharmaceutical, food, and non-metallic minerals. For example, the selection of gypsum powder, calcium carbonate, and other non-metallic minerals, as well as the iron removal and particle separation of feldspar, quartz, and barite. Materials that easily form precipitates, such as pigments, dyes, insecticides, resins, cement, and amorphous limestone, chalk, E-PVC, and inorganic powders in fillers, can be classified. At the same time, different density materials such as recycled rubber can be separated from fiber impurities, and special industrial ultrafine particles can be used
The extraction of powders, such as magnetic powders, has a wide range of applications.
The characteristics of this machine are as follows:
1. This machine is a dry material air classifier with the most advanced turbine classification principle in the world today: a classification turbine with secondary air intake and continuously variable speed. The combination of the classification turbine and the dynamic airflow sealing device is the first of its kind in China and internationally leading. The classification accuracy is high, the classification range is wide, and the finished product particle size can be adjusted between 3-150um. In general, ultrafine powders with a content of less than 5um and over 97% can be obtained;
2. The blades of the graded impeller are made of special high-strength wear-resistant materials, which greatly improve the stability of high-speed operation, have a longer service life, and greatly reduce the deposition of micro powder in the discharge pipe when handling viscous and cohesive materials;
3. The structure of this series of high-efficiency turbine classifiers designed with computer-aided design is more compact and easy to operate. The thousand mile turbine volute design reduces the noise of the classifiers and ensures smooth operation;
4. It can form a closed-loop system with various mechanical crushers or airflow crushers, and can also perform material classification processing separately;
5. This machine occupies less space, has a simple and compact structure, is easy to operate, has fewer vulnerable parts, and is low-cost;
6. Low vibration, low noise, smooth operation, easy maintenance and cleaning, high degree of automation.

This machine mainly utilizes the screening theory of the turbine grading wheel: the balance between the centrifugal force generated by the rotating turbine and the centripetal force formed by the air. Its main working principle: During operation, the material is fed into the lower box of the classifier with a primary air, which acts as a sieve for the material, causing the particles to be fully dispersed and rise to the classification zone. Due to the high-speed rotation of the grading impeller, particles are subjected to both centrifugal force generated by the grading impeller and centripetal force generated by the viscous effect of the airflow. When the centrifugal force received by the particles is greater than the centripetal force, that is, coarse particles above the grading diameter rotate down the container wall, and the external secondary air is rectified into a uniform vortex through the guiding part, separating the fine powder mixed or adhered to the coarse powder completely. After separation, the coarse particles are discharged from the lower coarse particle port; Fine particles below the graded diameter enter the cyclone separator with the airflow, are collected by the collector, and the purified gas is discharged from the induced draft fan. By adjusting the speed of the driving motor and the size of the secondary air intake, the best grading effect can be achieved.
Due to the fact that the multi wheel classifier developed by our company feeds raw materials and partially graded air into the classifier, it is easy to match with ultrafine crushers (such as air flow mills) that transport products with air, without the need for a separation process between raw materials and air flow.


3、 Main technical parameters