PE Water Ring Pelletizing Melt Pump

PE water-ring pelletizing melt pumps are predominantly gear-type melt pumps, serving as the core supporting equipment for PE water-ring pelletizing production lines. Installed between the extruder outlet and the pelletizing die, they are specifically engineered to accommodate the high-temperature, high-viscosity characteristics of PE melt. The following sections provide a detailed overview from three perspectives: core functions, key features, and selection and maintenance:

Core Function

Pressure and Flow Stabilization for Granulation Precision: When PE melt exits the extruder, pressure and flow fluctuations often occur. As a positive displacement conveying device, this melt pump pressurizes and stabilizes the unstable melt before delivering it to the pelletizing die. This prevents issues like inconsistent particle size and agglomeration caused by flow variations, ensuring uniformly shaped and sized PE pellets.

Enhancing Plasticization and Production Efficiency: It facilitates further mixing of the PE melt within the pump, improving plasticization uniformity and reducing defects like crystalline spots and bubbles in the pellets. Simultaneously, it increases die pressure, aiding efficient pelletizing. This boosts overall production line output while lowering scrap rates caused by unstable material delivery. Furthermore, it reduces extruder load and energy consumption, typically lowering energy usage per kilogram of processed PE material by a certain percentage.

Key Features

Temperature and Pressure Resistance for PE Applications: PE water ring pelletizing typically involves high melt temperatures. These melt pumps are generally manufactured from high-temperature alloy steel, tool steel, and similar materials. The rotor undergoes nitriding treatment or full quenching, achieving a hardness ≥60 HRC. It can withstand operating temperatures ≤350–400°C and deliver maximum output pressure up to 40 MPa, meeting PE melt transportation requirements while offering excellent wear resistance and high-temperature deformation resistance.

Structural Design Optimized for Production: Flow channels feature dead-zone-free designs to minimize PE melt residue and prevent material degradation from stagnation. Sealing options include packing seals or mechanical seals to prevent high-temperature melt leakage. Electric heating is the primary method, with thermal fluid heating available for larger pumps. Precise temperature control prevents melt cooling and channel blockage.

Flexible Control and Easy Integration: Most models feature a motor + gear reducer + universal coupling drive configuration. Variable frequency speed control adjusts rotational speed for precise flow regulation, with flow exhibiting strict linearity to speed for seamless production line automation. The compact structure allows flexible installation between the extruder and die head without occupying excessive production space.

Selection and Maintenance Guidelines

Selection Parameters: Determine the melt pump's flow rate specification based on PE pelletizing output. Match the pump's tooth profile and speed range to the viscosity of the PE melt (typically 1–40,000 Pa·s). Confirm the pump's output pressure and permissible pressure differential according to the die pressure requirements of the production line. For example, high-output lines may select models with an output pressure of 35–40 MPa.

Routine Maintenance: Regularly inspect seal integrity to prevent melt leakage. Periodically clean residual PE material from the pump to avoid long-term buildup affecting delivery accuracy. Monitor the heating system to ensure stable temperatures, preventing pump damage or PE melt performance degradation due to thermal anomalies. Inspect core components like gears and bearings for wear, promptly replacing aged parts to extend equipment lifespan.

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