Precautions For Ring Die Pellet Machine

Ring die pellet machine is a kind of equipment that processes solid waste such as straw, wood chips, bark and branches, etc. into dyes. What is the specific operation process of the machine?

1. Select the appropriate die hole form, opening ratio and compression ratio (compression ratio = proper length of the die hole/diameter of the die hole) according to the variety, formula and output of the feed to be produced.

Generally speaking, straight holes and stepped holes are suitable for processing compound feed; outer tapered holes are suitable for processing high-fiber feeds such as defatted bran; inner tapered holes are suitable for processing feeds with light specific gravity such as grass powder. On the premise of ensuring the strength of the ring die, the opening ratio of the ring die should be increased as much as possible. For some types of feed, under the condition of ensuring a reasonable compression ratio, the wall of the ring die is too thin, so that the strength of the ring die is not enough, and explosions may occur during production. Die phenomenon, at this time, under the premise of ensuring the appropriate length of the die hole, increase the thickness of the ring die and increase the pressure relief hole. Generally speaking, the compression ratio between 5-8 should be selected for compound feed with high grain content; the compression ratio between 5-8 should be selected for feed and urea feed; the compression ratio between 5-11 should be selected for concentrated feed; It is suitable to choose a compression ratio between 7 and 15.

In addition, after considering the basic formula of the feed, 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 production, reduce energy consumption, and reduce wear of the ring die. However, such a If the pellets are not firm enough, the appearance is loose and the length is different, the pulverization 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 pulverization rate is small), but it will increase The production cost of the product.

2. Whether the working gap between the ring die and the pressure roller is reasonable or not has an important influence on the rational 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 state of seemingly rotating but not rotating 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 a new mold is installed, firstly, loosen the pressure roller adjustment bolts to adjust the pressure roller to the state where the outer surface of the pressure roller is close to the inner surface of the ring die; secondly, adjust the eccentric shaft of the pressure roller in order to The gap between each pressure roller and the ring die is appropriate, pre-tighten the adjusting bolts, pull the ring die, gradually adjust the gap, make the pressure rollers reach the working state of seemingly rotating but not rotating, and then tighten the adjusting bolts.

When the new die is installed, it is usually required that the gap between the ring die and the pressure roller is slightly larger than required, which is conducive to the smooth transition between the new ring die and the old roll. After the new die and the old roll complete a certain running-in period , the gap can be adjusted to the gap required by the user.

In use, the pressure roller is sacrificed for the environmental protection mold, because the price of the ring die is more than ten times or even dozens of times the price of the pressure roller, so in use, under the condition of choosing a reasonable gap, the hardness of the pressure roller cannot Too high, that is to say, the wear resistance of the pressure roller cannot be higher than that of the ring die.

3. When the operator installs or replaces the ring die, for the ring die assembled through the cone surface, when installing the new mold, it is required to avoid the bumps and scratches on the cone surface, and the cone surface and its matching drive rim The conical surface should be cleaned as necessary and assembled with oil.

When replacing the ring die, dismantle it without bumping or scratching the cone surface, and apply oil for protection. For pellet mills that often need to replace the ring die, it is required to check the drive wheel rim regularly to prevent excessive wear and cause the centering pin of the mold to break, because excessive wear will affect the fit between the ring die and the wheel rim , the fit is not tight, when the ring die is working, it will generate shear force on the centering pin of the mold and cause breakage. When this happens, do not mistakenly think that the pin is not strong enough and replace it with a high-strength pin, otherwise It can only cause damage to the ring die pellet machine.

Therefore, it is quite necessary to protect and regularly check the matching cone surface of the ring die pellet machine and the cone surface of the matching drive wheel rim.

For the hoop-type assembled 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 and tear, which will affect the matching accuracy with the ring die pellet machine, thereby affecting the production output of the ring die pellet machine, and it should be repaired as necessary.