A screw conveying mechanism of extruder that can improve extrusion efficiency

Abstract

The invention relates to a screw conveying mechanism of an extruder which can improve the extrusion efficiency, which comprises a connecting flange, an outer bush, and an inner spiral conveying bush. One end of the sleeve is equipped with a connecting flange, and a spiral cooling channel is provided at the joint surface of the outer bush and the inner screw conveying bush; the outer bush is respectively provided with a cooling inlet and a cooling outlet, and the outer bush is Also set the temperature control temperature measuring point. The beneficial effects of the invention are: it is beneficial to realize the characteristics of high-efficiency extrusion, excellent plasticization, increased specific flow rate, and reduced specific power consumption; it can greatly reduce material conveying fluctuations and shear wear, thereby avoiding the problem of material melt breaking and further The bridging phenomenon of the material port improves the extrusion accuracy and ensures the stability of product extrusion; reduces the concave part phenomenon caused by extrusion and strong friction at the bottom of the material port, and improves the service life of the product; different functions of extrusion can be configured machine screw.

Description

technical field [0001] The invention relates to plastic extruder technology, in particular to an extruder screw conveying mechanism capable of improving extrusion efficiency. Background technique [0002] In the plastic extrusion process, the conveying mechanism of the single-screw plastic extruder directly affects the extrusion efficiency of the plastic single-screw extruder, the plasticizing effect of the material and the service life of the equipment. The conveying structure of the existing plastic single-screw extruder It is not suitable for high-efficiency extrusion, its energy consumption is high, and the conveying system is severely worn. The specific defects are as follows: (1) The extrusion system adopts a straight slot conveying structure, which can cause material conveying fluctuations and severe shear wear, and it is easy to advance It causes the problem of material melt breaking and bridging at the feed inlet, so that it is difficult to ensure the extrusion stab...

AI Technical Summary

Problems solved by technology

[0002] In the plastic extrusion process, the conveying mechanism of the single-screw plastic extruder directly affects the extrusion efficiency of the plastic single-screw extruder, the plasticizing effect of the material and the service life of the equipment. The conveying structure of the existing plastic single-screw extruder It is not suitable for high-efficiency extrusion, its energy consumption is high, and the conveying system is severely worn. The specific defects are as follows: (1) The extrusion system adopts a straight slot conveying structure, which can cause material conveying fluctuations and severe shear wear, and it is easy to advance It causes the problem of material melt breaking and bridging at the feed inlet, so that it is difficult to ensure the extrusion stability of products with high extrusion precision requirements; (2) The existing extruder straight groove conveying structure is to convey the material into the straight The trough conveying structure, after the material enters the bushing of the straight trough conveying structure, it is pushed forward after friction and shearing, and the material overcomes the solid plug formed by the shearing friction to push the material forward, so this conveying method consumes a lot of energy and has low efficiency; (3) When the traditional straight trough conveying mechanism is conveying, when the material enters the bushing straight trough, it relies on the screw rotation friction to convey the material. At this time, a high pressure difference is established. Due to the pressure and shear time established in advance at the feeding place and The location of the feed port makes it easy to squeeze and wear at the blanking part of the feed port, resulting in a concave surface at the bottom of the feed port, which reduces the service life of the product

Images