A screw extruder with pre-compression function

Abstract

The invention discloses a screw extruder with the prepressing function. The screw extruder with the prepressing function comprises a bracket, a prepressing cylinder and a pair of transmission gears which are mutually meshed, wherein a drive tank and an extrusion cylinder are arranged on the bracket; a motor, a reducer, a transmission shaft and a coupling are arranged in the drive tank; an extrusion screw rod is accommodated in the extrusion cylinder; an extrusion feeding hole and an extrusion discharge hole are formed in the extrusion cylinder; the prepressing cylinder is in a horizontal type and is arranged at the top part of the exterior of the drive tank; a prepressing screw rod is horizontally arranged in the prepressing cylinder; a prepressing feeding hole and a prepressing discharge hole are also formed in the prepressing cylinder; the prepressing discharge hole is formed in the axial position of the prepressing screw rod; and the pair of transmission gears are arranged on the prepressing screw rod and the transmission shaft respectively. According to the screw extruder with the prepressing function, a material can be prepressed firstly so that gas in the material can be completely driven away and it is ensured that gas explosion will not occur in the material to affect final forming quality, and thus the strength of a sample in extrusion moulding can be improved, the structure is simple, prepressing and extrusion are automatically carried out simultaneously, the operation time is saved, the human cost is reduced, and the working efficiency is improved.

Description

technical field [0001] The invention relates to an extruding machine, in particular to a screw extruding machine with pre-pressing function. Background technique [0002] A screw extruder is a common extrusion molding machine. In the prior art, a screw extruder includes components such as a driving device, an extruding barrel, a feeding device, an extruding screw, and a die. After the material is sent into the extrusion barrel through the feed port, the material is pushed forward by the extrusion screw. As the material advances, the rotation of the extrusion screw produces a strong compression force and shear force on the material, and the compression force is huge. in shear force. The material is compressed and pushed to the die, extruded into strips through a perforated plate, and then cut into shape. [0003] When the material enters the extruder from the feeding port and is extruded, if there is a large amount of gas in the material, a gas explosion may occur, which wi...

AI Technical Summary

Problems solved by technology

However, in the general production process of the horizontal screw extruder, manual operation is required, and two devices are used to pre-press and extrude the material, which is labor-intensive and low in production efficiency.

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