A melt pump is a kind of equipment mainly used for the transportation, pressurization and metering of high-temperature and high-viscosity polymer melts. The following is a detailed introduction for you:
Pump Casing: It is the external protective structure of the melt pump. Usually, it is made of high-strength and high-temperature-resistant metal materials, which provides support and protection for internal components such as gears and bearings, and can also withstand the melt pressure under high-temperature and high-pressure environments.
Gears: They include the driving gear and the driven gear and are the core working parts of the melt pump. Generally, they are involute external meshing gears. According to the tooth direction, they can be divided into straight teeth, helical teeth, herringbone teeth and so on. During operation, the melt is transported by the change in working volume caused by the meshing of the driving and driven gears.
Sliding Bearings: They are used to support the rotation of the gear shafts and are usually made of materials with good wear resistance and self-lubricating properties. There are lubricating grooves and holes on the sliding bearings, which utilize the melt for self-lubrication and can work under high temperature and high pressure.
Front and Rear End Plates: Installed at both ends of the pump casing, they are used to fix components such as gears and bearings and prevent the leakage of the melt.
Packing Seals: They are used to seal the gap between the pump shaft and the pump casing to prevent the melt from leaking out of the gap.
The melt pump belongs to a positive displacement conveying device. Its working principle is based on the rotational movement of two meshing gears inside the pump body. When the gears rotate in the specified direction, the melt enters the tooth grooves of the two gears in the feeding area. As the gears rotate, the melt is brought into the conveying area from both sides. When the gears mesh again, the melt in the tooth grooves is squeezed out of the discharging area and is then pressurized and sent to the outlet pipeline.
Compact Structure: It occupies a small space, is convenient for installation and maintenance, and has advantages on some production lines with limited space.
Reliable Operation: High-quality materials and advanced manufacturing processes are adopted to ensure the stable operation of the equipment under harsh conditions such as high temperature and high pressure, reducing equipment failures and downtime.
Low Energy Consumption: Compared with other conveying equipment, the melt pump has higher efficiency when transporting high-temperature and high-viscosity polymer melts, which can reduce energy consumption and save production costs.
High Volumetric Efficiency: It can accurately transport and meter the melt, ensuring the stability of the production process and the consistency of product quality.
Low Shear Effect on the Melt: During the transportation process, the shear force on the melt is relatively small, which can avoid the degradation and performance changes of the melt and is suitable for production processes with high requirements for melt quality.
Plastic Processing: It is used in the production processes of plastic melt pelletizing, mixing, extruding sheets, pipes, films and profiles, etc., which can improve the quality and product precision of products.
Rubber Industry: In the production of rubber products, it is used to transport high-temperature rubber melts, such as in the production of tires, rubber hoses and other products.
Chemical Fiber Industry: It is used to transport and meter the melts of chemical fiber raw materials, such as in the production of polyester, nylon and other fibers.
Other Fields: It can also be applied in the production processes of resin, hot melt adhesive, medical plastics and other industries.
Installation: Since the pump body operates under high temperature, hinge supports should be set on the piping during cold installation to prevent the displacement of the piping after heating up. The coupling must be hot-aligned after the pump body is heated up to avoid generating additional torque during operation.
Starting and Operation: When starting the pump, when there is no pressure formed at the outlet, do not blindly increase the speed to prevent premature damage to the shaft or bearings.
Maintenance: Regularly clean the internal parts of the pump. When cleaning, do not use the pump to transport the cleaning liquid. Instead, remove the internal parts, and then install them after cleaning is completed to avoid foreign objects getting mixed into the pump. Meanwhile, the melt filters should be regularly replaced, and do not operate under high pressure or even at the upper limit of pressure for a long time.
