Screw rod for double-screw extruder and capable of achieving convenient and fast replacement of abrasion-resistance kneading block element

Abstract

The invention discloses a screw rod for a double-screw extruder and capable of achieving convenient and fast replacement of an abrasion-resistance kneading block element, and the screw rod is improvedstarting from the kneading block element. The abrasion-resistance kneading block element of the screw rod comprises a fixing sleeve, ceramic bars and a base body, wherein concave pits are evenly distributed in the outer surface, parallel to the axis direction of the screw rod, of the base body; inner threaded holes connected with the fixing sleeve are distributed in the surface of the base body;and each ceramic bar comprises a base and a bar body, the bar bodies are cones, and the bases are cylinders, can be placed in the concave pits of the base body and are matched with the concave pits. By means of the abrasion-resistant screw rod, the problem about abrasion to screw rods of the double-screw extruder can be effectively solved, and due to the convenient and fast replacement characteristic, the service life of the screw rod can be remarkably prolonged.

Description

technical field [0001] The invention relates to twin-screw extruder equipment, and more specifically relates to a screw of a twin-screw extruder that can conveniently replace wear-resistant kneading block elements. Background technique [0002] Wear is one of the main causes of screw failure in twin-screw extruders. During the material extrusion process, the material will have friction and wear with the surface of the screw, resulting in an increase in the gap between the screw and the barrel, affecting the normal operation of the twin-screw extruder, and even the screw cannot be used due to severe wear on the surface of the screw components. In order to improve the extrusion performance of materials, it is often necessary to add a lot of fillers, such as calcium carbonate, glass fiber and talcum powder. Due to their high hardness, the screw will wear quickly, and some screws will fail in about 6 months. Currently commonly used screw alloy materials include 45 steel, 40Cr s...

AI Technical Summary

Problems solved by technology

During the material extrusion process, the material will friction and wear with the surface of the screw, which will cause the gap between the screw and the barrel to increase, which will affect the normal operation of the twin-screw extruder, and even the screw cannot be used due to severe wear on the surface of the screw components.

In order to improve the extrusion performance of the material, it is often necessary to add a lot of fillers, such as calcium carbonate, glass fiber and talcum powder. Due to its high hardness, the screw will wear quickly, and some screws will fail in about 6 months.

Currently commonly used screw alloy materials include 45 steel, 40Cr steel, 38CrMoAlA, etc., and nitriding treatment is used to improve its wear resistance, but the cost of replacing the screw is very high, and hard alloys containing Cr, W, Co, B and other elements are used Spraying and surfacing repair of alloy coating can better improve the hardness and wear resistance of the screw element surface, but if the alloy materials used for spraying and surfacing repair want to significantly improve their hardness and wear resistance, it is necessary to add more The high content of high melting point elements such as Cr and W will increase the difficulty of its preparation process, and the toughness and other quality of the obtained coating will deteriorate. The subsequent molding process will also be difficult and costly. If the screw is worn out, the screw will need to be replaced again, which will affect the normal production

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