Use a hammer mill

Hammer mill is a machine that uses high-speed rotating hammers to crush the feed. It has the advantages of wide versatility, weak temperature sensitivity to feed, good crushing quality, easy maintenance, and high productivity. However, if the user does not have enough analysis of several key issues that affect the work performance of the shredder, it will result in low productivity and high power consumption, and the crushing quality cannot be guaranteed. This article describes several key issues to consider when using a hammer mill and analyze it. 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 crusher hammer speed has been increased. Generally, the crushers used on the farm are mostly 60-70m/s. When crushing the stem feed, the crusher takes a low value. When crushing the grain feed, it takes a high value. In short, according to the instruction manual It is required to select the appropriate hammer line speed in order to make full use of 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. 4. Under the premise of satisfying the requirements for livestock and poultry raising, the sieve diameter of the sieve with a larger mesh opening diameter should be selected so as to have a significant effect on the power output of the crusher, and also directly affect the crushing rate of the crushing feed (feed pellets). The average diameter). Feed fineness M=(0.25-0.33)d. The larger the mesh diameter, the higher the electricity yield, but the coarser the crushed material. In general, when grinding fine feed, the diameter of the mesh opening can be increased by 20% to 35% for every 1mm increase in diameter from d=2mm. Conversely, the smaller the diameter of the mesh, the finer the feed is, but the productivity and power production of the machine are also significantly reduced. Therefore, under the premise of satisfying the requirements for livestock and poultry raising, sieves with a larger hole diameter should be used. 5. Feeding amount must match with the air flow through the screen. The type of the crusher is different. The amount of feed is different. It has a direct impact on the crushing efficiency. When the amount of feed is greater than a certain amount of air flow through the screen, the material will be accumulated on the screen surface, causing different degrees of blockage of the screen hole, the circulation layer of feed in the pulverization is thickened, so that the resistance on the rotor increases Large, resulting in reduced crushing efficiency. Therefore, when the amount of feed only meets the design requirements of the crusher, the power consumption is the minimum, and the productivity is the highest. The motor is not overloaded, and the user will be satisfied with the crushing product. 6, pay attention to the balance of the machine grinder is a high-speed rotating machine, both at the factory after the dynamic and static balance test. After a period of use, when the edge of the hammer blade wears to 1/2 of the width of the hammer, the edge change or turn around must be performed in-situ. Axially fed grinders can also be used with adjustable heads when the blade is worn. When it is necessary to replace the new hammer, it is necessary to re-allocate the group and ensure that the quality of each group is not more than 5g, so as not to affect the balance of the machine and cause vibration and noise. 7. Pay attention to the tightness of the belt. The looseness of the belt of the crusher can be adjusted by adjusting the front and rear positions of the movable motor on the frame. To avoid slippage of the belt, it can be loosened to increase the wrap angle.