Common problems and causes analysis of flat die pellet mill
Roller part of flat die pellet mill
Question: Deformation or fracture of roller cross shaft.
Analysis of causes: 1. hard objects resistance; 2. quality problems of forgings.
Question: Roller bearing damage.
Analysis of causes: 1. non regular injection of lubricating oil; 2. quality reasons of bearing itself.
Question: Wear of roller shell.
Analysis of causes: 1. normal or abnormal wear and tear over a long period of time; 2. hard objects suppress damage; 3. poor heat treatment leads to excessive wear.
Flat die part of pellet mill
Question: Flat die fragmentation.
Analysis of causes: 1. hard objects are mixed into the raw materials; 2. the quality of flat die is not qualified.
Question: No pellet or serious wear of the flat die.
Analysis of causes: 1. grinding does not pass through; 2. moisture of raw material is high or low; 3. the gap of roller and flat die need to be readjusted; 4. normal working wear.
Question: Uneven flat die holes, flat die rusting or uncleanness of surface burrs, etc.
Analysis of causes: 1. the processing equipment is not precise, or small diameter but thick flat die; 2. after heat treatment of flat die, it is easy to oxidize and rust in moist environment; 3. production management is not in place.
Box body and other parts of flat die pellet mill
Question: Case breakage.
Analysis of causes: 1. in the process of work, there are hard objects entry or gravity hammer; 2. the box body itself has the quality problem.
Question: Fastening screw damage causes the failure to reinforce the box.
Analysis of causes: 1. when fastening screws, thread damage is caused by no control thread tightening; 2. hammer screws; 3. screw thread itself has problems, reaming or replacing the box.
Question: Basin angle tooth damage.
Analysis of causes: 1. there is a screw or hard object in a gearbox.; 2. bad holding-on of small gear shaft and large gear; 3. long running normal wear and tear.
Common problems, cause analysis and solutions of flat die pellet mill
| Existing problems | Possible reasons | Solutions |
|---|---|---|
| No pellet of the mill. | 1. The new flat die is not inadequately ground or ground with oil. | 1. Removing the raw material from the current machine and adding oil material into the raw material to fit the new flat die. |
| 2. High raw material moisture. | 2. Adjusting the moisture of the raw material to the appropriate. | |
| A sudden stop of the motor. | 1. Voltage below level. | 1. Starting up the mill when the voltage is stable. |
| 2. The pressure between the roller and the flat die is too large. | 2. Adjusting the gap between the roller and the flat die properly. | |
| The made pellets are very soft or powdery. | 1. The raw material is too dry. | 1. Properly adjusting the water content of the raw material. |
| 2. The flat die has been badly worn and needs to be replaced. | 2. You can replace the flat die. | |
| Roller wear too fast. | 1. There is no raw material between the roller and the flat die for a long time. | 1. Adding material in time to ensure that the raw materials are filled between the flat die and the roller. |
| 2. There are a lot of small hard sundries in the raw materials. | 2. Sieving raw materials before adding raw materials. |