Extruder

Abstract

The present invention relates to an extruder. The extruder comprises a cylinder, a screw rod, a flange and a mold body, the circumferential edge of the screw rod rotationally abuts against the inner wall of the cylinder, the flange is mounted at the discharge port end of the cylinder, one end of the mold body is embedded with the end of the flange, a sprue spreader is coaxially arranged inside theflange, and the conical surface of the sprue spreader faces the screw rod. A flow guide plate is detachably mounted on the portion, on one side of the flange, on the inner wall of the cylinder. A plurality of first flow guide holes and second flow guide holes obliquely run through the end face of the flow guide plate in the circumferential direction, staggered guide plates used for guiding materials and switching extrusion directions are arranged between the discharge ends of the first flow guide holes and the second flow guide holes, and the staggered guide plates are parallel to the conicalsurface of the sprue spreader. The extruder has the effects that the flow direction of a solution can be switched, so that the outer wall of a finally extruded pipe is smooth and free of impurities,the finished product quality of the pipe is improved, and the below-standard rate and the rejection rate are both reduced.

Description

technical field [0001] The present invention relates to the technical field of pipe processing, in particular to an extruder. Background technique [0002] The plastic extruder is mainly composed of an extrusion system, a transmission system and a heating and cooling system; when the extrusion system is heated to a given process temperature and kept for a period of time, the raw material particles are poured into the hopper set at one end of the plastic extruder. , so that the raw material particles are smoothly introduced into the barrel under the action of its own weight or the thrust of the feeder. In the subsequent molding, the raw material particles need to be transported in the barrel to complete the process of transportation → compaction → compression → melting and plasticization → homogenization to form a uniform solution. [0003] Usually, the extruder consists of three sections, and is embodied by three sections of the screw. The first section is the feeding sectio...

AI Technical Summary

Problems solved by technology

[0004] After the screw is used for a long time, it is often due to factors such as frequent switching between high-temperature materials and low-temperature materials, the shedding of the electroplating layer of the screw, and the production of fireproof materials such as PBT materials and PC materials, which will lead to carbonization on the outer extension of the screw and the inner wall of the barrel, forming impurities. There will be uneven black impurity stripes on the surface of the extruded pipe, which will affect the appearance and eventually lead to the substandard quality inspection. Therefore, the above problems need to be improved urgently

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