There are three reasons why the content of magnetic metal in the flour exceeds the standard: the material of the grinding roller is improper and does not meet the requirements, which is the main reason; the second is that the quality of the grinding roller is poor, which is another reason for the excessive rubbing of the magnetic metal after the flour. ; Thirdly, the operating technology is not good. The following Ruixiang grinding machine manufacturers analyze these three reasons one by one.
1. The material of the grinding roller is improper and does not meet the requirements. This is the main reason. The exceeding value of 0.007 is caused by this reason. At present, most companies in the industry use white alloy cast iron and gray cast iron as the material for the grinding rollers of the grinders, and their performance can generally meet the standard requirements. Commonly used alloy cast irons are vanadium-titanium alloy and molybdenum-chromium-copper alloy. However, the grinding roller materials of individual enterprises still use general white cast iron, which is difficult to meet the standard requirements, and the performance indicators of flour and total magnetic metal content cannot be controlled within the standard specified range. Therefore, it is recommended to still use white cast iron. Cast iron grinding roll companies change the material of the grinding rolls as soon as possible and use alloy cast iron to ensure the quality of flour processing.
2. The poor drawing quality of the grinding roller of the flour mill is another reason for the excessive magnetic metal content in the flour. The width of the drawing tooth top of the roller body is too small, and the metal on the surface of the silk roller is easily ground when the mill is working. It enters the flour, causing the magnetic metal content in the flour to exceed the standard.
3. The operation technology of the flour mill is not good. Some operators have increased the productivity during the operation of the flour mill, increased the powder extraction rate, adjusted the roller pitch too tightly, and excessively increased the grinding between the rollers, thereby entering the magnetic metal in the flour That's too much. Especially when the straightness and cylindricity errors of the surface of the grinding roller are out of tolerance, this situation often occurs.