One minute to teach you to judge the cause of the pellet machine blockage

Reason 1: The material is too large

The space of the pressing chamber is limited, and the fluffy raw material enters the pressing chamber, causing the pressing chamber to be blocked.

Suggestion: add screening equipment at the front end or change the mesh of the screening equipment to a smaller size.

Reason two: uneven feeding speed

Uneven feeding speed or too large feeding volume will cause the feeding port to be blocked. If the feeding machine is not shut down in time, it will cause the pellet machine to become stuffy.

Recommendation: When the pellet machine is started, the feeding amount must be from low speed to high speed, and then the feeding speed is uniform, and the feeding amount matches the rated capacity of the equipment.

Reason 3: There is accumulation of material in the pellet machine

After the pellet machine is produced, there will be some accumulations, and there is no clean residue. After the next pellet machine is operated, due to the high temperature, it will solidify into a hard block, so the pellet machine cannot discharge the material normally.

Suggestion: clean the inside and clean up the residue.

Reason 4: New mold grinding

Some new molds may have insufficient mold hole finish, oxide layer, rust spots, etc. due to manufacturing process problems, forming burrs and drilling traces that increase friction in the hole diameter of the abrasive tool, causing difficulty in ejecting particles or blocking the machine.

Suggestion: It takes about 20 minutes of grinding before production. If the same amount of material is sent to the granulation chamber, the current will be gradually lower than that at the beginning of grinding, and it will be relatively stable with a small fluctuation range. At this time, you can stop the machine and open the operating door to observe the ring. In the case of die-out pellets, if the pellets are uniform and reach more than 90%, it will be fine.

Reason 5: Motor voltage is low

The motor of the pellet machine needs the rated voltage to work normally. If the voltage is too low, even if the motor can rotate, the power it generates is not enough to quickly extrude the material in the compression chamber. At this time, a large amount of material will be blocked in the compression chamber, causing material blockage.

Suggestion: add a power distribution room or configure a transformer to make the voltage stable.

Reason 6: The ring mold is blocked

In the production process of the pellet machine, if foreign impurities such as metal sand and stone enter the pelletizing chamber, the mold hole will be blocked by these impurities, which will block a large amount of materials in the compression cavity and cause blockage.

Suggestion: Shut down and open the silo, take out the ring die after cleaning out the material, and carefully polish the discharge hole. Pay attention to polishing with professional tools to avoid wear or other damage to the die hole.

Reason 7: bearing damage

Damage to the bearing will make the pressing parts incapable of working, and a large amount of material will be blocked in the compression chamber if it cannot be discharged.

Suggestion: Replace bearings with good quality and carry out regular oil maintenance on them

Reason 8: Material moisture is high or low

The high or low moisture content of the material will cause the die hole to be blocked, and the pellet machine will not discharge the material.

Suggestion: Use a dryer to control the moisture between 10%-15% to meet its granulation requirements.

Reason 9: the pressure roller is loose

When the pressure roller becomes loose, the gap between the pressure roller and the mold will increase, and the pressure will decrease, resulting in the inability to discharge smoothly, and the material layer between the mold rollers is too thick and unevenly distributed, causing material blockage.

Suggestion: stop and check, adjust the gap between the pressure rollers.

Reason 10: there is a problem with the scraper

The angle and thickness of the large scraper in the pressing chamber are not correct.

Suggestion: The distance between the scraper and the ring die should be about 2cm. Replace or reassemble the deflection scraper.

Reason 11: Operator

The operator lacks understanding and mastery of the performance and use of the pellet machine, which causes the pellet machine to malfunction or the ring die is clogged and cannot produce pellets.

Suggestion: The operator should be familiar with the various techniques of the pellet machine in order to keep the pelletizing equipment in the best production condition and produce high-quality, high-yield pellets.

Reason 12: The gap between the mold rolls is inappropriate

The gap between the ring die and the pressure roller is too large, which will cause the material layer between the die rollers to be too thick and unevenly distributed, and the pressure roller will easily slip due to uneven force. Once the squeezing force of the die roller against the material is less than the resistance of the inner wall of the die hole to the material, the material cannot be squeezed out and the machine will be blocked.

Suggestion: During production, pay attention to timely adjusting the gap between the mold rolls. When adjusting, the pressure roll and the ring mold form a state of “seeming but not relying, like turning but not turning”. The experience and adjustment feel of the granulating technician in this operation is very important.

Reason 13: The ring mode compression ratio is too large

Different materials require different compression ratio molds. If the compression ratio is too large, the feed will block the abrasive tool, and the produced particles will appear sporadic and shiny, and even carbonization and blackening.

Recommendation: Replace the ring die with a compression ratio suitable for the material.

Reason 14: serious wear of the ring molding roller

The pressure roller is severely worn, the surface has no teeth, and there is not enough friction to feed the material into the ring die hole; the ring die bell mouth is severely worn, the feed port is not smooth, the productivity is reduced, and the machine is blocked.