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How to clean the interior of the melt pump

The cleaning of the interior of a melt pump is a meticulous and crucial process. Below are the detailed steps and precautions:

I. Preparation

Ensure Safety: Before cleaning the melt pump, always disconnect the power source and allow the pump body to cool completely to prevent burns or electric shocks.

Prepare Tools: Gather necessary cleaning and polishing tools such as compressed air, clean cotton cloths, 600-grit sandpaper, trichloroethane or vinyl chloride solvent.

II. Dismantling the Melt Pump

Careful Dismantling: Gently remove the melt pump from the equipment, taking care not to damage the pump body or its components.

Heating to Melt Residue: If there are solidified residues inside the pump, place it in a vacuum heating furnace and gradually heat it to 400°C-450°C for approximately two hours to melt and drain the residues. Be cautious not to overheat, as this could reduce the hardness of the pump body material and affect its dimensional stability.

Sequential Dismantling: During the heating process or after the residues have melted, sequentially unscrew the bolts of the seal gland, front and rear cover plates, and remove components such as gears. Keep track of the position and orientation of all disassembled parts for easy reassembly.

III. Cleaning the Components

Gentle Placement: Place the removed gears and seal assemblies on a clean workbench, avoiding collisions and scratches.

Initial Cleaning: Use compressed air or a clean cotton cloth to remove dust and impurities from the surface of each component.

Thorough Inspection: Inspect each component for wear, cracks, burrs, and scratches. Gently sand off surface adherents with 600-grit sandpaper, but be extra cautious with metering gears, middle plates, and D-bearings to avoid removing metal or performing abrasive grinding that might compromise their metering functions.

IV. Deep Cleaning

Solvent Cleaning: After sanding, perform a deep clean with trichloroethane or vinyl chloride solvent to remove residual dirt and impurities.

Wipe Clean: Wipe each component clean with a clean cotton cloth, avoiding the use of paper towels to prevent lint or impurities from sticking to the parts.

V. Assembly and Inspection

Pre-Assembly Preparation: Prepare a can of lubricating oil. Ensure that the pump body, front and rear cover plates, driving and driven gears, seal assemblies, and seal gland are lubricated before assembly.

Reverse Installation: During assembly, strictly follow the reverse order of dismantling to correctly reinstall each component. Before tightening the bolts, apply high-temperature resistant grease to the threaded parts and tighten the bolts of the front and rear cover plates diagonally.

Inspection and Testing: After assembly, inspect all components for proper installation and conduct necessary tests to ensure the melt pump operates normally.

By following these steps, you can effectively clean the interior of the melt pump, maintaining its optimal working condition and extending its service life.

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