A large-scale plastic extrusion granulation unit underwater pelletizing system

Abstract

The invention discloses an underwater dicing system of a large plastic extruding granulation machine set. The underwater dicing system comprises a pipeline, a molten polymer inlet, a composite metal ceramic granulation template, a composite metal ceramic dicing knife, a follow-up flexible knife disc, a polymer particle and cooling water mixing chamber and a motor, wherein the composite metal ceramic granulation template is mounted at a rectification cone box body at the feeding end of the granulation machine set; a heating system is connected with a hot channel connector of the composite metal ceramic granulation template through a pipeline; the composite metal ceramic dicing knife is mounted on the follow-up flexible knife disc; the molten polymer inlet is ring-shaped; the polymer particle and cooling water mixing chamber is mounted on a main shaft of the motor. The underwater dicing system has the advantages that the metal ceramic material is relatively good in cavitation corrosion resistance and corrosion resistance; due to the follow-up flexible knife disc, the adjusting and mounting difficulty is lowered, the continuous and stable production is ensured, the stopping frequency of the granulation machine set is greatly reduced, and substantial profits are created for petrochemical enterprises.

Description

technical field [0001] The invention relates to the field of key equipment for producing PP and PE granule products in petrochemical enterprises, in particular to an underwater granulation system of a large-scale plastic extrusion granulation unit. Background technique [0002] Granulation formwork——The granulation formwork and granulation belt material in the previous granulation unit is made of hard alloy material. Its cavitation resistance and corrosion resistance are poor, which directly affects the granulation quality and service life of the granulation template. [0003] Pelletizing Knife—In the past, the material of the pelletizing knife used by petrochemical enterprises was high-carbon martensitic stainless steel or high-speed tool steel, and the more advanced ones were made of imported integral iron-based steel-bonded carbide. Both of them have low service life, or they are prone to breakage and affect the normal operation of the granulation unit. [0004] Cutterh...

AI Technical Summary

Problems solved by technology

During the work, the installation and debugging accuracy and technical requirements of the cutter head are very high. If the foundation settlement is different due to the vibration of the equipment and the position is deformed, it can only be stopped and adjusted frequently, so that the granulation production line cannot continue to work. The second stop will also cause the loss of materials

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