Twin-shaft melt gear pump
The twin-shaft melt gear pump primarily consists of a variable-frequency motor, gear reducer, coupling, gear pump body, and reducer lubrication system. The gear pump body comprises upper and lower gear rotors, sliding bearings, seal sleeves, and gear pump casings. Its operating principle involves two parallel shafts rotating synchronously in meshing engagement. Near the pump inlet, within the gear meshing zone, separation of the gear teeth and tooth cavities creates a low-pressure zone where material fills the cavities. As the gears rotate, the material is continuously conveyed within the sealed chamber toward the outlet. When the gear teeth and cavities close, the material is squeezed out, achieving pressurized delivery. The twin-shaft melt gear pump is a specialized gear pump designed for conveying high-viscosity melts. It is widely used in extrusion molding processes for polymer materials such as rubber and plastics.
Performance Features
Strong Adaptability to High-Viscosity Media: The pump's flow channels and gear tooth profiles are specially optimized to effectively overcome internal friction resistance in high-viscosity media. This enables stable conveyance of highly viscous materials like rubber and plastics, preventing clogging and material interruption.
Superior Delivery Efficiency and Pressure Performance: The dual-shaft gear meshing structure generates higher displacement and output pressure. At the same rotational speed, flow rate significantly exceeds that of single-shaft pumps. Precise gear matching minimizes internal backflow losses, ensuring high delivery efficiency. Additionally, the dual-shaft design distributes load, reduces individual gear wear, and extends pump service life.
High operational stability: The symmetrical dual-shaft layout and precision gear machining ensure minimal fluctuations in flow and pressure output during operation. This effectively suppresses pulsation, guarantees stable melt feeding, and reduces quality defects in products caused by uneven material supply.
Wear-Resistant Critical Components: Core parts like gears and shaft sleeves utilize high-hardness alloy materials. Surface treatments such as nitriding and polishing achieve hardness exceeding HRC55, enabling resistance to friction and erosion from high-viscosity materials and fillers.
Flexible process adjustability: Typically equipped with variable-frequency servo drive systems, precise flow control is achieved by adjusting motor speed. Select models support closed-loop pressure control, enabling real-time output pressure adjustment based on die feedback. This enhances process adaptability and reduces energy consumption.
Easy maintenance: Modular design allows rapid separation of the pump body and drive unit. An intelligent monitoring system continuously tracks gear wear and bearing temperature, facilitating predictive maintenance and minimizing downtime.
Dual-shaft melt gear pumps are primarily used for conveying, pressurizing, and metering high-temperature, high-viscosity polymer melts. They are widely applied in the extrusion molding of plastics, resins, rubber, and chemical fiber products, including industries such as pelletizing, film production, pipe manufacturing, sheet extrusion, sheet molding, artificial fibers, optical fibers, and medical plastic tubing.
Email: sale@meltpump.com
WhatsApp: +86 158 3833 1071