Long term use of the granulator or operator's misoperation may inevitably lead to equipment failure. If not resolved quickly, it may result in production stoppage and a decrease in company output. In fact, some common small problems with granulators can be solved by oneself. Below, Lina technical engineers will share with you common troubleshooting methods for granulators

Common faults of granulator 1

Start the main motor, the main motor does not move or stops instantly

【Reason for malfunction】

1. The main motor power supply is not connected

2. Insufficient heating time or malfunctioning of a certain heater, resulting in excessive torque and overloading of the motor

【Solution】

1. Check the wiring of the main motor power supply

2. Check the temperature display of each section and search for relevant records to confirm the preheating and heating time

3. Check whether each heater is damaged or poorly wired

Common faults of granulator 2

The main motor rotates, but the screw does not rotate

【Reason for malfunction】

1. The drive belt is loose and slipping

2. Safety key cut off

3. Gearbox malfunction

【Solution】

1. Adjust the center distance between the two pulleys and tighten the belt

2. Check the safety key, analyze the reason for disconnection, and replace it

3. Inspect and repair the gearbox

Common faults of granulator three

The screw has a speed display but cannot extrude the material

【Reason for malfunction】

1. The hopper has no material, and the feeding port is blocked by foreign objects or creates a "bridge", making it impossible to discharge the material

2. Metal or other hard objects (such as nuts) fall into the screw and block the screw groove, making it impossible to transport materials

3. The screw is twisted and broken at the root of the feeding section

4. The temperature of the screw and barrel is too high, and the internal cooling of the screw is poor, resulting in shaft hugging phenomenon

5. Equipment wear and tear

【Solution】

1. Add material to the hopper

2. Remove foreign objects from the hopper mouth or eliminate bridging phenomenon

3. If it is confirmed that foreign objects have entered the extruder, the machine should be stopped to disassemble the screw and remove any blockages or hard objects

4. Check if the driven pulley is rotating. If it is rotating normally and "no discharge" or "hard object blockage" is ruled out, it may be due to the screw being twisted and broken. Stop the machine immediately, disassemble the screw for replacement, and repair it

5. Check the screw cooling water system and increase the amount of screw cooling water

Common faults of granulator four

There is dirt in the extruded product

【Reason for malfunction】

1. There is dirt inside the material

2. Excessive carbon deposition on extruder screw

【Solution】

1. Replace materials

2. Clean the screw. For light cases, screw cleaning agent can be directly extruded for cleaning. For heavy cases, the screw can be disassembled and manually cleaned

Common faults of granulator five

The main motor power supply of the extruder fluctuates greatly

【Reason for malfunction】

1. A certain section of the heater is not working and the torque is unstable

2. The main motor bearings are poorly lubricated or damaged, and there is high vibration

【Solution】

1. Check if each section of the heater is damaged. If so, replace it. Check if the wiring of each section of the heater is correct and secure

2. Check the motor bearings, add lubricating oil or replace the bearings

Common faults of granulator six

Unstable extruded material

【Reason for malfunction】

1. Bridge the raw material feeding port

2. The speed of the main motor is uneven and fluctuates

3. Poor matching of heating and cooling system or significant thermocouple error

【Solution】

1. Clear the bridge at the discharge port of the hopper

2. Check the main motor and control system

3. Adjust the heating power, check the contact and installation of the thermocouple, whether the thermocouple is damaged, and replace it if necessary



The above are common troubleshooting methods for granulators.