Extruder meltblown melt metering pump

Extruder melt pump, extruder meltblown pump, extruder metering pump

1Extruder Melt PumpProduct Overview

extrudermelt pumpSelecting external cylindrical gears (straight teeth, helical teeth, herringbone teeth) for relative rolling to achieve precise fluid volume, high-precision gear clearance, and volumetric structural planning can be used for stable and balanced transportation, pressurization, and metering of various high-temperature and high viscosity polymer melts. Melt metering pumps are widely used in production lines such as chemical fibers, granulation, plastic films, sheets, plates, profiles, pipes, wires and cables, wire drawing, and composite extrusion. This series of melt gear pumps has good self-priming function and can be applied to the transportation and pressurization of polymer materials under vacuum reaction conditions.Extruder Melt PumpIt can also be used to transport high viscosity materials such as hot melt adhesive, asphalt, paint, adhesives, pharmaceuticals, food, oils, fuels, oils, dyes, coatings, lubricants, polyols, etc. that do not contain particulate impurities.

BYRTExtruder meltThe pump consists of a pump casing, front and rear side covers, gear shaft, sliding bearings, and shaft seals.Extruder Melt PumpBelonging to the positive displacement pump, the operation relies on the mutual meshing of the main and driven gears to modify the operating volume and transport the melt. The operating volume is composed of the pump body, gear teeth, and bearings with side plate function. When the gear rotates, the molten material enters the tooth grooves of the two gears in the suction chamber. As the gears roll, the molten material is brought into the discharge chamber from both sides. The re meshing of the gears causes the molten material in the tooth grooves to be squeezed out of the discharge chamber and pressed into the outlet pipe. As long as the pump shaft rolls, the gear presses the melt towards the outlet side, so the pump outlet can reach a high pressure, and the flow rate is independent of the discharge pressure base.Extruder Melt PumpThe common types of gears include straight teeth, helical teeth, herringbone teeth, and helical teeth, with involute and circular arc profiles being the most common. Usually, small gear pumps use involute spur gears,Extruder Melt PumpVariable gears are often used, and involute helical gears are often used in melt pumps for transporting high viscosity and high-pressure polymer melts. The gear and shaft are integrated, and their rigidity and reliability are higher than those of gear pumps made separately from the gear and shaft. The gears of low-pressure gear pumps abroad often use square structures, where the tooth width of the gear is equal to the diameter of the tooth tip circle. The tooth width of high viscosity gear pumps used in high-pressure applications is smaller than their tooth tip circle diameter, in order to reduce the radial compression area of the gears and lower the load on the gears and bearings.

Installation diagram of extruder meltblown metering pump:

Extruder meltblown melt metering pumpChoosing high-precision gear clearance can effectively reduce the pressure of the material barrel during extrusion, reduce the friction between the screw and the material barrel, alleviate the load on the thrust bearing of the gearbox, and effectively deal with the problem of exhaust and material leakage from the extruder. The melt pump adopts filling sealing and mechanical spiral sealing methods to effectively avoid the occurrence of glue leakage. It has the characteristics of high temperature resistance, high pressure resistance, high wear resistance, and corrosion resistance, which strengthens the requirements for high torque and low shear of the pump body,Extruder Melt PumpThe pump body has high smoothness characteristics, and the self smoothing system and inlet and outlet flow channels have been optimized. Linear flow channel planning has been selected to effectively reduce the residence time of materials in the pump, enabling them to achieve better plasticization and complete stable and balanced extrusion.

Gear type: spur, helical or herringbone cylindrical gear; Heating method: electric heating or heat medium heating;

Sealing structure: ① Melt dynamic seal+Packing seal ② Mechanical seal ③ Dynamic seal with cooling melt ④ High temperature resistant packing seal;

Primary structural material: ① Pump casing: Alloy steel/Stainless steel ② Gear: Nitrided steel/tool steel/stainless steel+coating/special alloy

③ Bearing: Tool Steel/copper alloy/stainless steel+coating/Special materials;

Driving method: motor+reducer+Universal coupling; Flow control: mechanical speed regulation and variable frequency speed regulation;

IIExtruder Melt PumpEquipment and Applications

1. Divine generals should be retainedExtruder meltblown melt metering pumpOpen the packaging carefully and inspect it carefully. If there is any damage or missing parts, please communicate with our company immediately. This pump is made of high-temperature alloy steel material, and all components have undergone heat treatment to achieve high hardness. Therefore, the material is relatively brittle and belongs to precision equipment. Any collision or drop may cause severe damage, and it is recommended to use lifting ring equipment.

2. Please accurately distinguish during installationExtruder Melt PumpImport and export. When the equipment is correct, the pump shaft rotates clockwise. When installing equipment such as motors, reducers, universal couplings, and pumps, it is necessary to fix the pump base to ensure the concentricity between the pump base and the motor drive shaft. When rolling, it is necessary to have no jamming, otherwise it will cause gear jamming, and in severe cases, the drive shaft may crack.

3. There are pressure sensor holes and temperature sensor holes on the surface of the pump body. If the sensors are installed correctly, the measurement data may show errors. High strength bolts are used at the connection point of the pump body to ensure safe operation of the pump body.

4 . When starting the pump, open the inlet and outlet valves and operate at low speed. After the pump operation is stable, it can gradually be adjusted to normal speed and pressure. If the pump is not rolling smoothly, it is necessary to stop the pump and check the cause to avoid severe damage inside the pump. If using packing seal, often adjust the orientation of the sealing cover to keep the sealing condition in a relatively good state.

3、 Disassembly and cleaning of extruder melt pump

1. Be careful to applyExtruder Melt PumpDisassemble the device and slowly heat it up in a vacuum furnace for two hours until400℃-450℃. The temperature should not be too hot, otherwise it may cause a decrease in the hardness of the pump body material, affecting the stability of the pump body scale.

During the heating process, dissolve and discharge the residual materials. Unscrew the bolts of the sealing cover and the front and rear cover plates in sequence. All disassembled components should be kept in mind for orientation and direction, and all equipment should be returned to its original position. When removing the gear, due to the adhesion of residual solid materials, do not use hard objects to strike and damage the edges and corners of the teeth and bearings. Instead, use a plastic or soft copper hammer to quietly strike and remove them.

3. Extruder Melt PumpAfter the gear and sealing components are disassembled, they should be gently placed on a clean table and cleaned with compressed air or a clean cotton cloth. And carefully inspect each component for wear, cracks, burrs, and scratches. available600# Sandpaper quietly polishes the attachments on the surface, and special attention should be paid to measuring the gears, middle plates, andDType bearings should never have their metal removed or ground, otherwise it will affect their measuring function.

4.Extruder melt metering pumpAfter polishing each component, clean it with trichloroethane or vinyl chloride solvent, and then wipe it clean with a cotton cloth. Do not use paper towels, as there may be paper scraps or impurities sticking to the components. Only after cleaning can the equipment be operated.

4Operation of extruder melt pumpMethods of homework

1. Due to the high temperature operation of the pump body, hinge supports should be installed on the piping during cold equipment to prevent displacement of the piping after temperature rise.

2. It is necessary to align the coupling after the pump body is heated up to avoid generating additional torque during operation.

3. The outlet pressure measuring point of the extruder metering pump should be equipped with an interlock stop alarm, otherwise, if the discharge pipeline is blocked, it may cause damage to the pump body.

When starting the extruder metering pump, do not blindly increase the speed when there is no pressure at the outlet to avoid premature damage to the shaft or bearing.

When cleaning and pipetting the extruder metering pump, do not use the pump to transport the cleaning solution. Remove the internal components and wait until the pipetting is complete before using the equipment to avoid foreign objects from entering the pump.

6. The temperature of the heat medium jacket of the extruder meltblown pump body may be slightly lower than the temperature of the heat medium in the front and rear jacket tubes. Because the viscosity of the melt is a decreasing function of the shear rate, the compression of the gear and the shear of the bearing will cause the temperature of the melt to rise by 3~after passing through the pump5Lowering the temperature of the heat medium can prevent the degradation of the melt. By lowering the temperature in the bearing area, the bearing capacity can be greatly increased without the need to replace large capacity pumps. By simply increasing the speed, the output capacity of the gear pump can be increased50%.

7. The acceleration of the extruder meltblown pump should be carried out slowly, without causing a sharp increase in front and rear pressure, to avoid damaging the bearings or causing the melt to block smooth channels.

8. The melt filter behind the outlet of the extruder meltblown pump should be replaced regularly, and should not be operated under high pressure or even the upper pressure limit.

9. Regularly replacing bearings can save maintenance costs. When the wear on the inner surface of the shaft or bearing is found to be close to the thickness of the hardened layer, the shaft should not be polished and reused, but only the bearing should be replaced, which can extend the service life of the pump shaft.

10. In case of power outage or interruption of heat medium circulation for more than 30 minutes, the extruder meltblown pump should be disassembled and cleaned before reassembling from scratch to avoid damage to the pump due to smooth bearings caused by solidification, cracking, etc. of the melt.

5、 Faults and troubleshooting of extruder melt pump

6、 Performance parameters of melt metering pump