Single screw extruder

Abstract

The invention discloses a single-screw extruder comprising a frame, a bearing chamber, a transitional shaft, a seal cover, a feed inlet, a discharge sleeve, a discharge outlet, a screw tapered shaft and the like. One end of the screw tapered shaft penetrates the left of the seal cover and is in insetting connection with the head of the transitional shaft. The discharge side of the other end of the screw tapered shaft is mounted within the discharge sleeve and is connected with a moving cantilever of the discharge sleeve. The screw tapered shaft is provided with a plurality of spiral blades; a screen plate is disposed between the screw tapered shaft and the seal cover. The screw tapered shaft in such a shape that the diameter of the screw tapered shaft decreases and then increases from the feed end to the discharge end; the pitch of the spiral blades gradually increases from the feed end to the discharge end; the diameter of the part, at the first blade and close to the discharge sleeve, of the screw tapered shaft is 396mm to 398mm, and the diameter of the part, at the third blade and close to the discharge sleeve, of the discharge sleeve is 386mm to 392mm; the discharge sleeve is tubular, with the inner diameter being 400mm to 406mm; a distance between the discharge sleeve and the screw tapered shaft is 7mm to 10mm. The single-screw extruder has the advantages such that extrusion, tearing and dewatering are effective and the screw tapered shaft rarely abrades.

Description

technical field [0001] The invention relates to material extrusion, tearing and dehydration equipment, in particular to a single-screw extruder used for material extrusion, tearing and dehydration in chemical mechanical pulping. Background technique [0002] The screw extruder is a mechanical extrusion dehydration device, which has a good dehydration effect on a variety of sheet materials with high water content. Its working principle is that when the motor drives the reducer and the screw shaft operates normally, the material is evenly added from the feed box, and the material entering the chute is pushed forward along the spiral groove under the thrust of the screw blade, and the material is pushed to the variable pitch and screw. During the extrusion section formed by the spiral blade, it is affected by the changing pitch, screw diameter, spiral blade and pressure screen frame, through the frequency conversion control of the motor, a large controllable torque is formed, a...

AI Technical Summary

Problems solved by technology

The diameter of the helical blade of this utility model gradually becomes smaller, and the force of extrusion and tearing during the process of material extrusion and movement to the discharge end is not strong enough during operation, and the tearing effect is not good.

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