
It is necessary to install it in the right position.During the pelletizing process, if we make mistake when we install a ring die, it may cause a series of problems, for example non-uniform wearing on the ring die, acquiring non-uniform pellets, or bouncing up and lower from the ring die.
Additionally, if we mount the ring die obliquely, the machine will run unstable an cause the un-ballance stress, which would harm the maching and influence the pellet quality. So it implies that we should control the run-out amplitude of the ring die end face within 0.2mm during our ring die installation process. An skillful operator is able to measure this by his eyes with putting a piece of metal wire on the end surface of the die and ajust it by hands. Also a dial indicator might be employed for calculating the run-out for people who is not so experienced. Additionally, tightening the 4 bolts attacting the ring die to the pellet mill symmetrically as well as in pairs is also very crucial to balance the ring die. At this time, we need a torque spanner make sure that the same torque is used on all bolts. The torque applied should meet the die manufacturer's requirement.
A proper locating pin is also very important to protect the die effectively. Proper means its strength should not be too long or too short, neither too strong and too weak. That require us to purchase a locating pin that perfectly match the ring die.
Then is the right gap between rollers and ring die. Generally speaking, the gap should be within 1 mm to 3 mm. If the gap is too large, rollers and ring die can not provided enough pressure to squeeze the powders through the holes and form the pellets. While if the gap is too small which can cause the wear and tear of the rollers and ring die. The gap also changing with the size of the ring die holes. That is to say, a die with larger holes, the gap should be larger. Also if the material is hard to pelletize, the gap should be smaller. So it is important to adjust the gap according to different situations.

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