Common issues with three return rotary dryers are explored in this new. The viewer will learn how to identify and address problems that can lead to inefficient operation and costly downtime.
Introduction: Understanding the basics of three return rotary dryers
Briefly introduce the concept of three return rotary dryers and their importance in various industries.
Highlight their common applications in drying materials like grains, wood chips, and food products.

Briefly touch upon the working principle of these  rotary dryers, focusing on the three return design and how it contributes to efficient heat transfer.
1.‌ Bearing failure:
Bearing heating: Check whether the bearing lubrication is good, whether the bearing is loose, and whether the bearing has friction with other parts.
Bearing damage: the bearing should be replaced in time, and check the causes of bearing damage, such as improper installation of equipment, poor lubrication, etc., and timely repair.
2. Three return rotary dryer drum failure ‌ : Cylinder rupture: should be stopped immediately to check, find the cause of the rupture, and repair.
Cylinder deformation: the causes of deformation should be checked, such as high temperature, unequal force, timely adjust the temperature and force of the cylinder, so that the cylinder can return to normal.
Cylinder vibration or up and down movement: it may be that the connection between the tug device and the base is damaged or the side of the rolling ring is worn. The fastening connection part should be corrected or the rolling ring should be turned or replaced ‌ according to the degree of wear.
3.‌ Motor fault:
Motor cannot start or operation is interrupted: check whether the power connection is normal, whether the door switch and control panel are faulty, and whether the motor itself is faulty, such as motor communication failure.
Excessive motor noise: may be a fan motor problem, roller bearing wear or loose/worn belt, should open the dryer back cover for inspection, and make necessary adjustments or replacement.
3.‌ Drying effect is not good:
The moisture content of the material after drying is greater than the specified value: it may be insufficient heat supply, and the furnace temperature should be increased or the feeding amount should be reduced ‌25.
The moisture content of the material after drying is less than the specified value: it may be that the heat supply is too much or the amount of wet material fed is too small. The amount of wet material fed should be increased or the supply of hot gas should be reduced.
Uneven drying or too long time: may be related to uneven clothing distribution, improper temperature and time Settings, should adjust the clothing distribution, optimize the temperature and time Settings.
4.‌ Other faults:
The rolling ring has sway to the cylinder: it may be that the concave joint side of the rolling ring is not clamped, and the backing plate should be used to keep the rolling ring and the concave joint evenly and properly clamped.
The meshing gap between the big gear and the pinion is damaged: it may be tug wear, stop wheel wear, pinion wear, should be turned or replaced according to the wear situation.
5. Filter blockage or exhaust pipe problem: the filter should be cleaned regularly, check the connection and exhaust pipe, once the problem is found, it should be cleaned or replaced in time.
When troubleshooting, you should first ensure safety, follow the instructions and maintenance manuals of the equipment, and seek the help of professional maintenance personnel if necessary.