What are the difficulties in the processing of small displacement melt metering pumps?

Integral to a small extruder with precision extrusion is a polymer dosing melt pump, a device that precisely measures flow, which measures the volume of polymer and increases fluid pressure. Melt gear pumps with small displacement are mainly used in small extruders, small cast film machines, small calenders, small film blowing machines, small laminating machines, MDO stretching machines, etc.

The melt pump is a kind of gear pump. Its metering principle is: when the gear of the hot melt pump rotates, a suction cavity with an increased volume is formed on one side of the feed hole, and the melt enters the suction cavity from the feed hole and fills the tooth valley. With the rotation of the gear, it is continuously brought to the side of the discharge hole, and the side of the discharge hole squeezes the melt in the tooth valley with the meshing of the gear teeth, forming an extrusion cavity to press the melt out of the pump from the discharge hole. For the melt metering pump with small displacement, there are the following four difficulties in the processing process.

1. The parts processing technology has high requirements. In order to ensure the high wear resistance and corrosion resistance of the melt metering pump, the parts should be subjected to vacuum heat treatment and deep ice cold treatment before processing.

2. The small-displacement melt metering pump has a small gear module, requires high precision, and is difficult to process.

3. The five gear holes of the middle plate, the main and driven holes of the inner cover plate, the partition plate and the outer cover plate are arranged in a planetary arrangement, and the position of the five holes is required to be high, the hole finish is required to be high, and the grinding is difficult. .

4. The thickness of the middle plate is thin, the flatness and parallelism of the two planes are very high, the surface finish is high, and the grinding is difficult.

The role of the melt gear pump in extruder stability is self-evident. In the laboratory stage, after the small extruder is equipped with the melt metering pump, it can be as close to the actual production environment as possible, and the samples can be better prepared. , has a very positive role in guiding the production process. the small displacement metering pumps provided by Zhengzhou Batte are 0.1cc, 0.2cc, 0.5cc, etc., which can meet the production needs of users. For details about the model or equipment quotation of melt metering pump info@battemachinery.com