Guide: The main responsibility of the classifier of the vertical mill is: spreading, grading and finished product collection. The quality of its work is directly related to the quality of the finished product of the vertical mill. The research improvement of the performance of the vertical mill separator and the understanding of its working principle can help the vertical mill users to obtain better production results and economic benefits under the original conditions.
The function of the vertical mill powder separator is to pass the qualified and unqualified separation of the coarse and fine powder mixed powder after grinding by the mill, and to re-grind the qualified collection and unqualified return mill, and the standard of pass or fail. It is based on customer needs.
Vertical mill powder sorting machine The cyclone type powder sorting machine is mainly composed of a casing, a cyclone cylinder, a collecting duct, an air inlet pipe, a rotating part, a transmission device and a fan. The casing is composed of an upper cover, an upper part of the cylinder body, a powder selection chamber, a cone-shaped cylinder body, a lower part of the cylinder body and a lower cone; the rotating part is composed of a main shaft, a fan blade, a fan blade, a spreading disc and a sleeve. The transmission part is composed of a motor and a speed reducer. The upper part of the cylinder has an air outlet connected to the cyclone. There is a fine powder outlet at the lower part of the cyclone, and an air outlet is connected to the collecting duct at the upper part. The lower part of the cylinder body is provided with an air inlet port, and the air inlet pipe is connected with the fan, and the lower cone is provided with a coarse powder discharge port.
When the material is crushed and crushed by the grinding roller, it is brought by the negative pressure between the shell and the blade of the classifier for secondary sorting. The larger particles fall due to collision with the guide vane, and the rest enters between the blade and the rotor. . The second sorting is carried out through the material of the blade, and the qualified material passes through the rotor under the action of the high-speed rotating rotor and the negative pressure to become the finished raw material, and the coarser material is thrown to the wind guiding blade and falls, and the grinding powder is re-pulverized. mill. Appropriate adjustment of the rotor speed and the angle of the classifier blade can appropriately adjust the fineness and yield of the sorting material.
Since the speed adjustment of the original vertical mill classifier is based on the speed requirement of the classifying rotor, and does not take into account the actual spreading condition of the spreading disc, the rotation speed of the rotor of the second classifier is determined according to the product fineness. Different and actual operating conditions to adjust, so it is generally difficult to have a suitable speed for the spreader. If the rotation speed is insufficient, the material can not be thrown enough, causing the material to be locally dense; if the rotation speed is high, the powder will be thrown away, causing it to impact the wall of the cylinder to form a dense pile and a large gap.
In view of the defects of the above-mentioned vertical grinding and concentrating machine spreading disc mechanism, the following improvement measures are made: