Jamming & Blockage in Prawn Feed Extruder Machines: Causes, Troubleshooting & Quick Fixes

 

This guide pinpoints the root causes of blockages in mini electric shrimp feed extruder machines (materials, processes, components, operations) and provides clear troubleshooting, safe unblocking, and long-term prevention solutions to help you reduce downtime and ensure continuous production.

 

 

• Sudden surge in main unit current, tripping the circuit breaker, motor unable to start
  
• No material discharged from the outlet, abnormally high chamber pressure
• Severe machine vibration, increased noise, accompanied by odor/smoke
• The screw cannot rotate, manual cranking encounters extreme resistance

 

 

1. Material Factors (Most Common)

• Raw material moisture content too high (>20%) or too low (<10%), poor flowability
  
• Raw material with too high fiber/grease content, prone to sticking and clumping
• Contamination with hard objects such as metal/pebbles/plastics, jamming the screw

 

2. Inappropriate Process Parameters

• Screw/barrel wear, improper assembly clearance, axial movement
• Bearing damage, excessive clearance, lubrication failure
• Gearbox wear, broken teeth, poor meshing

 

3. Prawn Feed Making Machine Component Failure

• Screw / Severe barrel wear, excessive clearance, material backflow
• Bearing damage, seizure, screw unable to rotate
• Transmission system malfunction (belt breakage, gear jamming)

 

4. Operational and maintenance errors

• Failure to preheat before startup, feeding material before the temperature is sufficient
• Failure to empty material before shutdown, resulting in residual lumps
• Long-term lack of barrel cleaning, leading to hardened and blocked material

 

 

1. Emergency Shutdown and Safe Operation

• Immediately disconnect the power supply, hang warning signs, and do not force start-up
  
• Release the chamber pressure (open the exhaust valve) to prevent material splashing
• After the sinking shrimp feed extruder cools down, manually rotate the machine to determine the degree of blockage

 

2. Graded Unblocking Methods

• Mild blockage: Reduce speed and feed rate, reverse rotation to discharge material
  
• Moderate blockage: Remove the die head, clean the discharge port, and gradually unblock
• Severe blockage: Disassemble the barrel, use a special tool to clean the accumulated material/hard objects (do not use sharp tools to scratch the inner wall)

 

3. Repairing Faulty Components

• Inspect the screw/ Repair or replace worn barrel components.
  
• Replace damaged bearings and transmission parts to ensure smooth rotation.
• Clean the die head, repair blocked channels, and ensure uniform output.

 

 

• Strictly control raw material moisture content (12%-18%) and strengthen impurity removal.
  
• Standardize start-up procedures: preheat to the set temperature before feeding.
• Clean the die head regularly (every shift) and disassemble and inspect the barrel weekly.
• Optimize process parameters to match raw material characteristics and avoid overload.
• Establish a blockage log, analyze causes, and continuously optimize.

 

 

Symptom	Likely Cause	Fast Action
No discharge	Die blockage / low temp	Clean die, increase temp
Backflow at inlet	Pressure imbalance	Reduce feed, check die
High current	Overload / jam	Stop immediately
Burnt smell	Overheating / carbonization	Clean + adjust temp
Repeated clogging	Raw material issue	Recheck moisture & size

 

👉    Get the latest quote