screw of extruder

Abstract

The invention relates to the technical field of extruders, and discloses a screw of an extruder, which includes a cylinder body, a feed hopper is fixedly installed on the upper part of the cylinder body, and a connecting shaft is fixedly installed on one side inside the cylinder body , one end of the connecting shaft is fixedly installed with a rotating shaft, and the screw rod of the extruder changes the traditional threaded rod with a root diameter into a threaded rod with the same root diameter, and utilizes the thread groove of the threaded rod to increase the thickness The depth of the thread groove is changed by adding the number of thickened plates superimposed, and the volume size is changed, so that the depth of the threaded grooves on the rotating shaft can be freely controlled, and no or a small amount of thickened plates can be added in the solid conveying area. The number of thickened plates in the direction of the axial direction to the melt conveying area can be gradually increased to achieve the effect of compaction and increase the quality of subsequent discharges, and the number of thickened plates can be freely increased or decreased for different types of plastics In order to meet the best production requirements and maximize the quality of products.

Description

technical field [0001] The invention relates to the technical field of extruders, in particular to a screw of an extruder. Background technique [0002] In the plastic machinery, the extruder occupies a very important position. Most of the plastic products can be realized by extruding the extruder, and the core part of the extruder is the screw. Entering the extruder, the motor drives the screw to rotate, so that the screw drives the plastic waste to move in it, and the external electromagnetic heating coil heats and melts the plastic, making it a fluid plastic liquid that is extruded from the outlet of the extruder. But there are always some problems with existing extruders: [0003] 1. Existing extruders can be roughly divided into three areas in the axial direction according to different physical functions: solid conveying area, melting area and melt conveying area, but as the plastic waste is transferred from the solid conveying area to the melt conveying area During t...

AI Technical Summary

Problems solved by technology

[0003] 1. Existing extruders can be roughly divided into three areas in the axial direction according to different physical functions: solid conveying area, melting area and melt conveying area, but as the plastic waste is transferred from the solid conveying area to the melt conveying area During the moving process, due to the continuous heating and melting of plastic waste, the space occupied by it gradually becomes smaller. In order to make the melted plastic liquid more compact and compact, the most traditional extruder screw is to use the melting zone of the screw. The depth of the thread groove between the melt delivery area and the melt delivery area is reduced, and the root diameter of the screw is increased, thereby reducing the volume of the thread groove. However, the depth of the thread groove of such a screw is processed and is a fixed value, which can only be used for Some suitable plastics will work better, but different plastics have different requirements for the depth of the thread groove after melting, so the traditional screw is difficult to adapt to different types of plastics, and different types of plastics need to be replaced for different types of plastics. screw, poor applicability

[0004] 2. The extruder heats the plastic in the cylinder body through electromagnetic induction through the electromagnetic coil connected to the outside of the cylinder body, so the stirring effect inside the cylinder body will directly affect the uniformity of heating. Thereby affecting the degree of melting of the plastic, but because the screws of the existing extruders are smooth, whether it is for the unmelted plastic waste that has just entered the barrel or the liquid that is melted in the later stage, the smooth inner wall will affect its The effect of stirring is not good, and the effect of stirring in the solid conveying area is not good, which will affect the uniformity of its heating, thereby affecting the effect of its melting, so that the incompletely melted raw plastic waste cannot contact the cylinder faster to be heated and completely melted , and for the completely melted plastic liquid, it is necessary to reduce the space of the thread groove to ensure that the plastic liquid in the thread groove can be compacted more tightly, but due to the existence of pressure, it will inevitably make it difficult for some molten plastic liquid to Moving, coupled with the smooth screw, the stirring effect is not good. After a long time, it will directly cause the plastic liquid to stay in it for too long, and the plastic liquid will decompose or even burn in it, and adhere to the inner wall of the cylinder, which will greatly affect the Improve the heat transfer performance of the cylinder, and also reduce the quality of subsequent recycled plastics

Images