Ring die compression ratio applicable to different feed ingredients

    The wall of the ring die is too thin, and the strength of the ring die is not enough. Mold explosion will occur in the production. At this time, the thickness of the ring die should be increased and the pressure relief hole should be increased under the premise of ensuring the effective length of the die hole. Generally speaking, the compound feed with high grain content should choose the compression ratio between 8-12.5; the heat-sensitive feed and urea feed should choose the compression ratio between 5-8; the concentrated feed with high natural protein is suitable for choosing 5- The compression ratio is between 11; the compression ratio between 7 and 15 is suitable for the compound feed for dairy cows. In addition, after considering the basic feed formula, the specific compression ratio can be adjusted according to the feed quality required by the producer. For example, choosing a slightly lower compression ratio is beneficial to increase output, reduce energy consumption, and reduce wear of the ring die. It will reduce the quality of the feed. If the pellets are not strong enough, the appearance is loose and the length of the feed is different, the powdering rate of the feed is high. On the contrary, it is beneficial to the quality of the pellets (the pellets are smooth and shiny, and the powdering rate is small), but it will increase The production cost of the product.

　　Secondly, whether the working gap between the ring die and the pressure roller is reasonable or not has an important influence on the effective use of the ring die. Generally speaking, the gap between the ring die and the pressure roller is between 0.1 and 0.3. According to practical experience, it is better for the pressure roller to reach a non-rotating state while the ring die is rotated by hand. So, how to adjust the gap between the ring die and the pressure roller? According to our practical experience, when the new mold is installed, first, loosen the pressure roller adjusting bolt to adjust the pressure roller so that the outer surface of the pressure roller is close to the ring die. The state of the inner surface; secondly, adjust the eccentric shaft of the pressing roller in turn to make the gap between each pressing roller and the ring die proper, pre-tighten the adjusting bolts, pull the ring die, and gradually adjust the gap, so that the press roller achieves a non-rotating work. State, and finally tighten the adjusting bolt. When the new mold is installed, it is usually required that the gap between the ring mold and the pressure roller be slightly larger than what you need, which is conducive to the smooth transition between the new ring mold and the old roller, and wait for the new mold and the old roller to complete a certain running-in period Later, you can adjust the gap to the gap you need. In use, the ring die is sacrificed at the expense of the press roller. Because the price of the ring die is ten times or even dozens of times the price of the press roller, in use, the hardness of the press roller cannot be achieved when a reasonable gap is selected. Too high, that is to say, the wear resistance of the pressure roller cannot be higher than the wear resistance of the ring die.

　　In the production process of the ring die, the materials used are required to be cleaned up to avoid the material being mixed with hard particles such as large sand, sand, iron blocks, bolts and iron filings. Because these inclusions accelerate the wear of the ring die, and a large number of large hard inclusions will cause the ring die to be stressed multiple times, causing the ring die to fatigue. When the force exceeds the strength limit of the ring die, the ring die will explode. Mode phenomenon.

       Finally, when the operator newly installs or replaces the ring die, for the ring die assembled through the conical surface, when the new die is installed, it is required to avoid bumps and scratches on the conical surface, and to the conical surface and its matching transmission wheel flange. The cone surface is cleaned and assembled with oil. When replacing the ring die, disassemble it without scratching or scratching the cone surface, and it is protected by oiling. For the pellet machine that often needs to replace the ring die, it is required to check the drive rim regularly to prevent excessive wear and tear from causing the mold centering pin to break, because excessive wear will affect the fit between the ring die and the rim , The fit is not tight. When the ring die is working, it will produce shearing force on the centering pin of the mold and cause it to break. When this happens, do not mistake it for insufficient strength of the pin and replace it with a high-strength pin. It can only cause damage to the ring die and frequent breakage of the safety pin. Therefore, it is quite necessary to protect and regularly inspect the mating cone surface of the ring die and the mating cone surface of the transmission wheel flange. For the hoop-type assembly ring die, the protection and inspection of its assembly surface and its matching components are also quite necessary. When the pressure roller is used for a period of time, it will wear out, which affects the accuracy of matching with the ring die, thus affecting the production output of the ring die, and it should be repaired or replaced with a new ring die if necessary.

         In the production process, it is often found that the ring die is usually blocked, worn, sealed, and turned inward during use. At this time, if the necessary maintenance is not performed on it, it will cause a decrease in output, an increase in energy consumption, or even no production. Materials and other phenomena. At this time, the basic maintenance method for the ring die is to first grind the working inner surface of the ring die and then chamfer it. When replacing the ring die, it is required to fill the die hole with oily material while the hot die is hot, so that the ring die can reach the best condition during the next production.