Method for combining all single-head threaded sleeves of parallel double-screw extruder

Abstract

The invention discloses a method for combining all single-head threaded sleeves of a parallel double-screw extruder, the screw flight of the thread sleeves are all single-head, the diameter of the thread sleeve is set to be 1, the lead of screw is multiplied by the diameter by the diameter of the threaded sleeve, the specification comprises 0.1 / 1, 0.15 / 1, 0.2 / 1, 0.3 / 1 for short lead, instead of kneading blocks, 0.4 / 1, 0.5 / 1, 0.75 / 1, 1 / 1 as medium lead, used in connection of the over-conveying and hungry-type delivery, 1.3 / 1, 1.5 / 1, 1.8 / 1, 2 / 1 for large lead, used as hungry conveying and fast conveying, the grooves are all formed in circular arcs, the two combined screw rods are combined with the screw flight and the threaded groove to be meshed with each other, the feeding section is combined by 6 to 16 middle lead and large lead single-head threaded sleeve, 1 to 3 middle lead single-head threaded sleeves are added into 2 to 4 large leads and 2 to 8 short guide threads to combine the melting section and the mixing section into a double screw; 5 to 10 middle leads and large lead single-head threaded sleeves are combined in a row of gas sections and vacuum sections, 7 to 24 middle lead single-head threaded sleeves are combined to form a homogenized extrusion section, the waste plastics are specially produced, and the thread elements are prevented from being damaged by waste metals and impurities.

Description

Technical field [0001] This technology belongs to the field of plastic granulation mechanical extruders for chemical equipment. Background technique [0002] Plastic and its plastic products have become indispensable materials in all aspects of contemporary people and contemporary society due to their superior performance and wide range of uses. They are indispensable materials in today's society, irreplaceable materials, and their usage is increasing. The volume of plastics is increasing, and the scope of application is becoming wider and wider. In many countries, the output of plastics has surpassed that of steel and has become the country’s first material. China started decades later than developed countries, but China’s rapid development has entered the world. Forefront, as for the production of plastic machinery and equipment in our country, the rapid development of plastic equipment, continuous improvement of plastic equipment, new varieties continue to appear, plastics als...

AI Technical Summary

Problems solved by technology

Due to the different types and sizes of waste plastics, the crushed plastic particles are of different sizes. The small powder melts quickly in the extruder, and the large particles are more than ten times larger than the small particles. The melting time is certain. It takes several times longer than small particles to melt. However, the current extruders are all general-purpose, and the twin-screw extruders used for waste plastics are actually just adjustments to individual parts of the whole machine.

There are also such pulverized materials, which are granulated by single-screw extruder. The particles are easy to produce, but the materials extruded by the single-screw are unevenly mixed, and the mixing of the extruded granules cannot meet the standard of the finished granules. Single-screw extrusion The granules produced by the extruder can only be used for low-grade plastic products. At present, many manufacturers use single-screw extruders to make plastic materials, and then go to twin-screw extruders to redo granulation, or twin-screw extruders The plasticized material produced, and then to the single-screw extruder to redo the granulation

[0006] At present, when the twin-screw extruder produces recycled plastics after crushing, the output is unstable. The plastic output is low. At present, on the market, on the side of the advancing flight of the meshing threaded sleeve of the feeding material, the arc-shaped flight is changed to a straight flight. The manufacturers in Nanjing are called "SK" series threaded sleeves. The straight screw edge pushes more crushed plastic into the barrel, but this improvement only removes one-thirtieth of the section of the actual screw sleeve arc, changing from rounded corners to right angles, which is not obvious for multi-feeding, and at the same time destroys The advanced feature of the arc meshing of twin-screw threaded sleeves, the advanced arc meshing is high self-cleaning, which avoids the phenomenon of single screw - the material sticks to the screw and stays for a long time, causing the material to change color and stay Coking, staying carbonized, and the changed right angle has no meshing, and becomes a single screw phenomenon, which will cause the material at the right angle to stick to the screw sleeve for a long time, and the material will change color and coke when it stays for a long time. Staying carbonized will cause material quality problems, so the "SK" threaded sleeve is only used in the feeding section

[0007] The kneading block in the twin-screw extruder achieves the best effect on the mixing of materials, and the combined threaded sleeve can be combined arbitrarily. The combination of the current twin-screw extruder screws all have kneading blocks or shear blocks. The threaded sleeves are also double-threaded butt joints at the upper and lower ends of the kneading block. The kneading block shears, stirs and rolls the material to obtain the best mixing effect of the material. Some manufacturers use twin-screw extruders to produce recycled waste plastics. , the metal in waste plastics is often not completely removed, resulting in the phenomenon that the kneading block is broken when it touches the waste metal

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