Seven planet screw combination device and method for plastifing, exhausting and extruding

Abstract

The invention relates to a seven planet screw combination device and method for plastifing, exhausting and extruding, comprising a screw mechanism, a cylinder, a material inlet, an air exhaust, a material outlet and a power mechanism. The screw mechanism comprises a center screw and six planet screws; the axis of the center screw is coincident with the axis of the cylinder; the axes of the six planet screws are all parallel to the axis of the center screw and surrounds the center screw; the center screw is meshed with each planet screw; each planet screw is meshed with two adjacent planet screws; the lines connecting the center of each planet screw form a regular hexagon; the center distance of any two adjacent planet screws is equal to the length of a side of the regular hexagon; the center screw is arranged in the center of the regular hexagon; and the power mechanism is respectively connected with the screw mechanism and the cylinder. The invention also provides a method for plastifing, exhausting and extruding. The invention has the advantages of adjustable retention time, low power consumption, thorough air exhaust and self-cleaning function, etc.

Description

technical field [0001] The invention relates to a plasticizing and exhausting extrusion processing technology for polymer materials, in particular to a seven-screw planetary combined plasticizing and exhausting extrusion device and a method thereof. Background technique [0002] In recent years, the field of polymer material processing has been moving towards the direction of energy saving, consumption reduction and green processing. High-speed machining, precision machining, material microscopic phase structure control and remote intelligence are the key development directions in the future. As a processing technology, from the raw material entering the equipment to the final product quality control, it has to go through several processes such as solid transportation, exhaust, melting, and melt transportation. At present, the widely used processing equipment mainly includes single-screw extruder, twin-screw extruder and so on. The material melt conveying process is mainly...

AI Technical Summary

Problems solved by technology

Although this structure can preliminarily solve the problems of poor mixing performance, poor self-cleaning characteristics, and poor exhaust effect in material processing, it still has the following defects: (1) There is this symmetry between the two screws, and the fluid flows along the two screws. The geometric space experienced during the forward process has antitropy, the reorientation effect of the interface is weakened during the shearing process, and the mixing effect is limited, especially most of the fluid mixing in the middle of the screw channel is still laminar flow mixing, and the interface is linear with time increase, the effect on material processing cannot be effectively maintained for a long time, and will weaken with the processing time; (2) Existing studies have shown that co-rotating twin-screws can only effectively mix the surface fluid near the wall area, In particular, the effect of the meshing zone is particularly obvious, and there is still great room for improvement in the overall core fluid mixing; (3) Chaotic flow technology is an effective way to mix high-viscosity fluids today. In order to further improve the mixing effect and improve the effective utilization of energy It is a very effective way to improve the plasticization, exhaust and mixing efficiency of the material processing process by increasing the number of meshing times. It is very effective to strengthen the above process by increasing the free area of ​​the screw surface and forcing the polymer material to pass through the meshing area. The key It is to control the residence time distribution so that the equipment technology has a self-cleaning effect. The traditional planetary screw technology is based on such considerations, but the traditional planetary screw extrusion technology center screw and planetary screw rotate in different directions, which lacks the engineering material processing process. The self-cleaning effect that is generally concerned in the field, the residence time distribution is difficult to control, and the application range is very narrow

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