Differential three-screw extruder with triangularly-arranged screws

Abstract

The invention relates to a differential three-screw extruder with triangularly-arranged screws. The differential three-screw extruder mainly comprises a feeding device, a machine barrel, screws, a machine head, a heating and cooling device, an exhaust port, a motor and a transmission device. The three screws comprise two male motors and a female rotor and are arranged in a triangular mode; when the three screws are combined, at least one thread meshing area is provided; the number of screw flight heads in the thread meshing area is integer multiples of the number of the male rotors; the rotational speeds of the male rotors and the female rotor are in an inverse proportion with the number of the spiral flight heads so as to realize the differential rotation; and the male rotors and the female rotor are not interfered during movement. The three screws can be arranged in the shape like an inverted Chinese character 'Pin', the shape like the Chinese character 'Pin' or other triangular arrangement modes. According to the machining requirement of materials, thread sections with different helical pitches and cross section molded lines or other types of thread sections can be arranged at different sections, such as a feeding section, a fusion section, a venting section and a metering section of each screw; when the three screws are installed, at least one differential rotating meshing area is ensured to be provided, and the three screws can be meshed or not meshed at different sections so as to realize the mixing enhancement, venting effect or other functions. The extruder disclosed by the invention has good capacities of mixing, plasticizing and delivery and is suitable for the machine-shaping of multiple materials such as plastics, rubbers, foods, explosive materials and the like.

Description

technical field [0001] The invention relates to a differential three-screw extruder with triangular arrangement of screws, which is suitable for conveying, plasticizing, mixing, granulating, extrusion molding and reactive extrusion processing of materials, and can be used in petroleum, chemical industry, rubber, plastic, food, pharmaceuticals , explosives and propellants industries. Background technique [0002] In industries such as petroleum, chemical, rubber, plastic, pharmaceutical, food, explosives and propellants, it is often involved in the mixing, shearing and plasticizing of high-viscosity fluids. Extruders and kneaders are used to achieve these functions. important equipment. The three-screw extruder is significantly better than the single-screw extruder and twin-screw extruder in terms of mixing effect and output, and it solves the defects of large space occupation, low efficiency and non-continuous operation of the traditional kneader. development prospects. ...

AI Technical Summary

Problems solved by technology

The three-screw extruder is significantly better than the single-screw extruder and twin-screw extruder in terms of mixing effect and output, and it solves the defects of large space occupation, low efficiency and non-continuous operation of the traditional kneader. development prospects

However, the axial thread structure of the screw in this patent is exactly the same, which cannot adapt to the different thread structures required by different processing stages of materials; the patent stipulates that the number of thread heads of the male rotor is 1, and the form is too single; and the patent is only a continuous The kneader is not very suitable for extrusion molding, granulation, mixing, etc. of materials.

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