Precautions for Replacing the Roller Shells on a Double Roller Press Granulator

 When replacing the roller shells on a double roller press granualtor, safety protocols must be prioritized. Ensure the entire machine is powered off and shut down, and display maintenance warning signs. Clear any residual material from inside the machine, and remove the protective housing. Apply alignment marks to the bearing housings and connecting components to prevent assembly errors. Verify the model, material, and socket specifications of the new roller shells, and inspect them for any cracks or deformation defects. Prepare specialized tools such as pullers, heating devices, and torque wrenches.

When removing the old roller shells, clean any oil residue or rust from the shaft shoulders. For interference-fit sections, apply uniform, low-temperature heating to loosen the fit, then use a hydraulic device to press the shell out smoothly. Strictly avoid using forceful hammering, which could damage the roller shaft or keyway. After removal, inspect the roller shaft, keyway, and bearing seats for wear; repair or replace any components exceeding tolerance limits in advance to ensure assembly precision.

Before installation, thoroughly grind and clean the mating surfaces of the shaft and roller shell. Align the keyway to insert the parallel key. It is highly recommended to utilize a standardized thermal assembly process with controlled heating to ensure the roller shell seats firmly against the shaft shoulder. Pay particular attention to calibrating the alignment and overlap of the sockets on both rollers. Adjust the roller bodies to ensure parallelism and uniform gap spacing, and tighten the pressure plate bolts diagonally and evenly to prevent uneven stress distribution.

Reinstall the bearings and seals, and apply appropriate lubricant grease. Upon completion, perform a no-load test run for 30 minutes while monitoring for machine body vibration, abnormal noises, bearing temperature rise, and current fluctuations. Once the no-load test is successful, run a small batch of test material to observe the granulation results; fine-tune the roller gap to optimize the quality of the finished product. Strictly avoid immediately resuming full-load production after replacement; this practice helps extend the service life of the roller shells.

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