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How to prevent plastic mills from malfunctioning

9/3/2018

Plastic pulverizerare widely used in the grinding of various plastic materials in the fields of chemical industry, waste recycling, plastic pipe profile manufacturing, plastic modification and so on. According to the principle of grinding powder, the grinding machine is mainly divided into two categories: rotor (turbine) mill and grinding disc mill. According to the milling method, the normal temperature mill and the deep-cooling mill are usually used. Normal temperature mill, also known as mechanical crushing.



First, the main factors affecting the wear of plastic mill parts:

1. Material hardness. If the hardness of the material processed by the plastic mill is very large, even harder than the material of the plastic mill, it will inevitably aggravate the wear speed of the plastic mill, leading to the early retirement of some parts, which is not worth the loss. The user should also refer to the imitation list during the use process to carry out accurate operation of the plastic mill.

2. Material impurities. If the material contains some impurities that are difficult to grind into it, it cannot be broken and destroyed, so that the continuous rotation in the grinding chamber will accelerate the wear speed of the grinding parts. Therefore, the material must be screened before the feed, and the impurities are removed.

3. The composition of wearing parts. The grinding ring and the grinding roller of the roller type plastic grinding machine must be made of high-quality steel. The parts made of inferior steel are worn fast. It may be replaced by the user after 1-2 months, which will definitely cause the user. property loss. Manganese steel is the most suitable steel for creating the wearing parts of ultra-fine plastic grinding machine. Manganese is a weak carbide forming element. It enters the cementite Fe3C department instead of iron atom to form alloy cementite. It can obtain refined pearlite. Graphite precipitation and carbide precipitation, no effect on the austenite, the more wear-resistant parts.



Second, through a large number of observations and analysis of the mill, it is concluded that the factors affecting the capacity of plastic mills under normal circumstances are:

(1) For low bed, no material will be squeezed into the front of the grinding roller, the unit power consumption is the lowest, but the output is not high. When the mill feed is insufficient, too low a bed will cause a relatively large vibration.

(2) There is a higher material bed, and the material forms a bow wave on the surface of the grinding disc, which can obtain higher output and lowest vibration.

(3) If the thickness of the bed is too high, the angle of penetration of the grinding roller exceeds the critical value, the material will accumulate in front of the grinding roller and be plowed by the grinding roller, which will cause very serious vibration and force the mill parking. The fact that the material is squeezed into the front of the grinding roll indicates that the movement of the grinding roll at the surface of the bed and the grinding roll is completely irregular.

(4) The grinding machine production capacity is also affected by the thickness of the material bed. The angle, the force P acting on the material and the speed of the grinding disc affect the power consumption and production capacity. The thickness of the bed affects the angle and affects the amount of force on the material. Therefore, increasing the thickness of the bed will increase the mill output.

It is concluded from the above that the bed of the plastic mill should work at the highest possible height of a bed to obtain a good yield and low vibration level, but not too high, otherwise it will cause economic disadvantage. And there is overflow.

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