How to properly disassemble and install core components of an extruder when replacing them?

 

 

Extruder core components (screw, bearings) require replacement after prolonged use. Improper disassembly (such as forcibly removing the screw without cleaning residual material, or failing to lubricate the bearings during installation) can lead to barrel scratches and shorten the lifespan of new components. Many maintenance personnel experience abnormal noises and material leaks even after replacement due to incorrect procedures.

 

 

1. Disassembly Process (Taking screw and bearing replacement as an example)

Preparation: Shut down the machine and allow it to cool (barrel temperature ≤ 40℃). Clean any residual material inside the barrel (if the temperature is high, inject a release agent to soften it, then remove it with a special hook);

 

2. Disconnect the power supply, remove the die head and heating coil, exposing the barrel and bearing housing.
Screw Removal: Loosen the bolts connecting the barrel and the gearbox, and move the gearbox backward 50mm; use a screw puller (matching the screw diameter) to hook the tail of the screw and slowly pull it out (if stuck, slightly heat the barrel to 60℃; do not force it); check the screw wear and mark the wear location for easy analysis.

 

3.Bearing Removal: Remove the bearing housing end cover and use a bearing puller (matching the bearing model) to pull the bearing off the screw shaft (if the bearing is interference-fitted with the shaft, slightly heat the inner ring of the bearing to 80℃ to avoid damaging the journal); clean the oil and impurities inside the bearing housing and check the wear of the bearing seat (if the wear exceeds 0.1mm, it needs to be repaired).

 

 

 

 

1. Installation Process (New Component Installation)

Component Pretreatment: Apply high-temperature grease (such as molybdenum disulfide grease) to the surface of the new screw, and check the straightness of the screw (error ≤ 0.1mm/m); after cleaning the new bearing, apply grease (filling 2/3 of the bearing's internal space), and check the bearing clearance (meets model requirements).

 

2. Bearing Installation:

Heat the bearing to 80-100℃ (use a bearing heater; open flame heating is prohibited), quickly insert it into the screw journal (ensuring it is in place), and check for smooth bearing rotation after natural cooling; slowly push the screw with the bearing installed into the barrel (aligning it with the barrel axis to avoid scratching the inner wall).

 

3.Component Reset:

Move the gearbox to align the gearbox output shaft with the screw shaft, install the coupling (calibrate coaxiality, radial deviation ≤ 0.05mm), and tighten the bolts connecting the barrel and gearbox; reinstall the heating coil (ensuring it fits snugly against the barrel and the wiring is secure), and the die head (tighten the bolts evenly to avoid die head deformation).

 

4. Test run verification:

No-load test run (screw rotates at low speed for 30 minutes, bearing temperature ≤55℃), load test run (produce according to the process, observe product quality, no abnormal noise or material leakage), confirm that the new component is operating normally.

 

 

 

 

 

 

MIKIM boasts extensive experience in poultry feed pellet production lines, significantly reducing the incidence of poultry diseases. Its equipment is not only widely used across various industries domestically but also exported to Southeast Asia, Europe, Africa, and South America, earning a high reputation internationally. This global presence not only demonstrates the adaptability and competitiveness of its products, but also demonstrates the company's experience in adapting to diverse market standards and logistics conditions, enabling it to provide a stable supply chain for its overseas customers. Whether serving large domestic farms or cross-border feed companies, MIKIM can leverage its global service network to ensure a consistent, high-quality experience.

 

For more information on process flow design, equipment layout, factory construction plans, individual equipment pricing, or turnkey project proposals, please feel free to contact us!!!

 

 

 

1. What is the price of the fish feed maker ?

The price ranges from approximately $3,500-$32,000

2. Do you provide maintenance services for your customers?
Yes, we offer comprehensive after-sales maintenance services to our customers.

 

 

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