7. Pay attention to the tightness of the belt. The belt tension of the pulverizer can be adjusted by the front and rear position of the movable motor on the machine base. To avoid the belt slipping, the loose side can be made up to increase the wrap angle. The hammer mill is a machine that uses a high-speed rotating hammer to crush the feed. It has the advantages of wide versatility, low temperature sensitivity to feed, good crushing quality, convenient use and maintenance, and high productivity. However, if the user has insufficient analysis of several key problems affecting the performance of the crusher, the productivity will be low, the power consumption will be large, and the crushing quality cannot be guaranteed. This article describes several key issues to be aware of when using a hammer mill and analyzes it.
1. Generally, the moisture content of the feed during pulverization does not exceed 15%.
The moisture content of the feed increases, the structural crispness decreases, the feed is not easily crushed, and the productivity and electrical output are reduced. Tests have shown that when corn moisture content increases from 14.3% to 21%, its productivity decreases by 29% and power consumption increases by 12.5%; when barley moisture content increases from 13.8% to 20%, its productivity decreases by 30% and power consumption increases by 12.5%. The moisture content of the feed when pulverized is required to not exceed 15%.
2. The hammer speed has a great influence. In the given range, the low value is taken when crushing the stalk feed, and the high value hammer speed when smashing the grain feed has a great influence on the productivity and power consumption of the pulverizer. Tests have shown that when the hammer speed is too low, the impact ability is lowered, and the wind power of the suction powder is also small, so the productivity is low and the power consumption is increased. When the speed is high, the pulverizing ability and the powder discharging ability are increased, and the productivity is improved. However, if the speed is too high, the vortex action of the pulverizing chamber is strengthened due to the increase of the blasting action of the rotor, resulting in an increase in no-load power consumption, and at the same time, the material speed is too high, and the chance of discharging the mesh hole is reduced, so the pulverization efficiency is also relatively decreased. In addition, if the hammer speed is too high, the power consumption of the bearing friction and the agitation air will increase sharply, and the energy consumption per unit product will be significantly improved. Therefore, each type of shredder has a suitable speed range. In recent years, the hammer speed of the pulverizer has been improved. Generally, the pulverizer used in the farm is 60_70m/s. When smashing the stalk feed, take a low value to pulverize the grain feed and take a high value. In short, choose the appropriate one according to the requirements in the instruction manual. Hammer line speed to fully utilize the efficiency of the shredder.
3, the hammer screen gap can not be too large or too small hammer screen gap refers to the gap between the end of the hammer and the screen, this gap has a greater impact on the working performance of the crusher. When the hammer screen gap is large, the feed particles in the feed close to the sieve surface are not easy to contact with the sieve sheet, and the chance of being hit is small, and the friction effect of the sieve sheets on them is also weakened due to the low speed, so the power output is decreased. The finished product becomes thicker. When the gap is large to a certain extent, the feed particles on the sieve surface move too slowly, and even the sieve holes are blocked, so that the productivity is further lowered. When the hammer screen gap is small, the outer ring feed is hit by hammers. The feed speed on the sieve surface is high, and it is difficult to pass through the sieve hole, so that the effect of friction pulverization is increased, and the feed is pulverized too finely. Conducive to the discharge of powder, not only waste power, so that the production of electricity is reduced, and the finished product is also too thin.
4. Under the premise of meeting the requirements of livestock and poultry breeding, the diameter of the sieve mesh with larger mesh diameter should be selected as much as possible. The influence of the diameter of the grinder on the power output of the crusher is very significant, and it also directly affects the fine crush rate of the crushed feed (feed pellets). Average diameter). Feed fineness M = (0.25 ~ 0.33) d. The larger the diameter of the mesh, the higher the electrical output, but the coarser the pulverized material. In general, when smashing the concentrate, the diameter of the mesh hole is from d = 2 mm, and the productivity can be increased by 20% to 35% for every 1 mm increase. On the contrary, the smaller the mesh diameter, the finer the feed pulverization, but the productivity and power output of the machine are also significantly reduced. Therefore, under the premise of meeting the requirements of livestock and poultry breeding, sieves with larger hole diameters should be used as much as possible.
5, the amount of feed should be matched with the air flow flowing through the sieve hole. The type of the crusher is different, and the feed amount is different. It directly affects the crushing efficiency. When the feed amount is greater than a certain value of the air flow rate flowing through the sieve hole, the material will be piled up on the sieve surface to cause the sieve hole to have different degrees of blockage. The thickening of the circulation layer in the pulverization increases the resistance acting on the rotor, resulting in pulverization efficiency. decline. Therefore, when the feeding amount is only in accordance with the design requirements of the pulverizer, the power consumption is small, the productivity is high, and the motor is not overloaded, and the user will get a satisfactory pulverized product.
6, pay attention to the machine's balance pulverizer is a high-speed rotating machine, both through the dynamic and static balance test. After a period of use, when the edge of the hammer wears to 1/2 of the width of the hammer, the change or turn must be performed in situ. The axially fed pulverizer is also adjustable for use when the blade of the priming device is worn. When you need to replace the new hammer, you need to re-match the group, and ensure that the quality difference of each group does not exceed 5g, to avoid affecting the balance of the machine and generate vibration and noise.
1. Generally, the moisture content of the feed during pulverization does not exceed 15%.
The moisture content of the feed increases, the structural crispness decreases, the feed is not easily crushed, and the productivity and electrical output are reduced. Tests have shown that when corn moisture content increases from 14.3% to 21%, its productivity decreases by 29% and power consumption increases by 12.5%; when barley moisture content increases from 13.8% to 20%, its productivity decreases by 30% and power consumption increases by 12.5%. The moisture content of the feed when pulverized is required to not exceed 15%.
2. The hammer speed has a great influence. In the given range, the low value is taken when crushing the stalk feed, and the high value hammer speed when smashing the grain feed has a great influence on the productivity and power consumption of the pulverizer. Tests have shown that when the hammer speed is too low, the impact ability is lowered, and the wind power of the suction powder is also small, so the productivity is low and the power consumption is increased. When the speed is high, the pulverizing ability and the powder discharging ability are increased, and the productivity is improved. However, if the speed is too high, the vortex action of the pulverizing chamber is strengthened due to the increase of the blasting action of the rotor, resulting in an increase in no-load power consumption, and at the same time, the material speed is too high, and the chance of discharging the mesh hole is reduced, so the pulverization efficiency is also relatively decreased. In addition, if the hammer speed is too high, the power consumption of the bearing friction and the agitation air will increase sharply, and the energy consumption per unit product will be significantly improved. Therefore, each type of shredder has a suitable speed range. In recent years, the hammer speed of the pulverizer has been improved. Generally, the pulverizer used in the farm is 60_70m/s. When smashing the stalk feed, take a low value to pulverize the grain feed and take a high value. In short, choose the appropriate one according to the requirements in the instruction manual. Hammer line speed to fully utilize the efficiency of the shredder.
3, the hammer screen gap can not be too large or too small hammer screen gap refers to the gap between the end of the hammer and the screen, this gap has a greater impact on the working performance of the crusher. When the hammer screen gap is large, the feed particles in the feed close to the sieve surface are not easy to contact with the sieve sheet, and the chance of being hit is small, and the friction effect of the sieve sheets on them is also weakened due to the low speed, so the power output is decreased. The finished product becomes thicker. When the gap is large to a certain extent, the feed particles on the sieve surface move too slowly, and even the sieve holes are blocked, so that the productivity is further lowered. When the hammer screen gap is small, the outer ring feed is hit by hammers. The feed speed on the sieve surface is high, and it is difficult to pass through the sieve hole, so that the effect of friction pulverization is increased, and the feed is pulverized too finely. Conducive to the discharge of powder, not only waste power, so that the production of electricity is reduced, and the finished product is also too thin.
4. Under the premise of meeting the requirements of livestock and poultry breeding, the diameter of the sieve mesh with larger mesh diameter should be selected as much as possible. The influence of the diameter of the grinder on the power output of the crusher is very significant, and it also directly affects the fine crush rate of the crushed feed (feed pellets). Average diameter). Feed fineness M = (0.25 ~ 0.33) d. The larger the diameter of the mesh, the higher the electrical output, but the coarser the pulverized material. In general, when smashing the concentrate, the diameter of the mesh hole is from d = 2 mm, and the productivity can be increased by 20% to 35% for every 1 mm increase. On the contrary, the smaller the mesh diameter, the finer the feed pulverization, but the productivity and power output of the machine are also significantly reduced. Therefore, under the premise of meeting the requirements of livestock and poultry breeding, sieves with larger hole diameters should be used as much as possible.
5, the amount of feed should be matched with the air flow flowing through the sieve hole. The type of the crusher is different, and the feed amount is different. It directly affects the crushing efficiency. When the feed amount is greater than a certain value of the air flow rate flowing through the sieve hole, the material will be piled up on the sieve surface to cause the sieve hole to have different degrees of blockage. The thickening of the circulation layer in the pulverization increases the resistance acting on the rotor, resulting in pulverization efficiency. decline. Therefore, when the feeding amount is only in accordance with the design requirements of the pulverizer, the power consumption is small, the productivity is high, and the motor is not overloaded, and the user will get a satisfactory pulverized product.
6, pay attention to the machine's balance pulverizer is a high-speed rotating machine, both through the dynamic and static balance test. After a period of use, when the edge of the hammer wears to 1/2 of the width of the hammer, the change or turn must be performed in situ. The axially fed pulverizer is also adjustable for use when the blade of the priming device is worn. When you need to replace the new hammer, you need to re-match the group, and ensure that the quality difference of each group does not exceed 5g, to avoid affecting the balance of the machine and generate vibration and noise.
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