Several key issues to note when using a hammer mill (1)
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1. Generally, the water content of the feed should not exceed 15% when it is crushed. The moisture content of the feed increases, the structure crispness decreases, the feed is not easily crushed, and the productivity and the electricity production must be reduced. Tests have shown that when corn moisture content increases from 14.3% to 21%, its productivity is reduced by 29% and its power consumption is increased by 12.5%. When the water content of barley is increased from 13.8% to 20%, its productivity is reduced by 30% and its power consumption is increased by 12.5. %. Therefore, it is generally required that the moisture content of the feed at the time of crushing does not exceed 15%.
2. The impact of the hammer speed is very large. In the given range, the low value is taken when the stem feed is crushed, and the high hammer speed when crushing the grain feed has a great influence on the productivity and power consumption of the grinder. Tests have shown that when the hammer speed is too low, the strike capability is reduced, and the suction power of the powder is also small, so the productivity is low and the power consumption is increased. When the speed is high, the crushing capacity and the powder discharge capacity are increased, so that the productivity is improved. However, if the speed is too high, due to the increase of the blast effect of the rotor, the vortex action of the crushing chamber is strengthened, leading to an increase in no-load power consumption. At the same time, when the material speed is too high, the chance of exiting the screen hole is reduced, and therefore the crushing efficiency is also reduced. In addition, if the hammer speed is too high, the power consumption of bearing friction and agitation air will increase dramatically, which will increase the energy consumption per unit product. Therefore, each type of shredder has a suitable speed range. In recent years, the speed of the hammer of the crusher has been increased. Generally, the crushers used in farms are mostly 60_70m/s. When crushing the stem feed, the crusher takes a low value, and when crushing the grain feed, it takes a high value. In short, according to the requirements in the manual Select the appropriate hammer line speed to give full play to the efficiency of the grinder.
3, the hammer screen gap can not be too large or too small Hammer screen gap is the gap between the end of the hammer and the screen, this gap has a greater impact on the performance of the mill. When the hammer screen gap is large, the feed particles close to the screen surface in the feed are unlikely to be in contact with the screen, and there is less chance of being hit. At the same time, the frictional effect of the screen on them is also reduced due to low speed, so the power output is reduced. The finished product becomes thicker. When the gap is large to a certain extent, the feed particles on the screen surface move too slowly and even block the screen holes, which further reduces the productivity. When the hammer screen gap is small, the outer ring feed has more chances of being struck by the hammer, the feed speed on the screen surface is high, and it is not easy to pass through the screen hole, so that the effect of friction crushing is increased, the feed is crushed too much, and more not To facilitate the discharge of powder, it is not only a waste of power, so that the production of electricity is reduced, and the finished product is also too thin.