Method for promoting screw squeezing granule forming degree and machine head thereof

Abstract

The invention discloses a method of improving screw extruding granulation forming degree and a die. The space between the die and the screw sleeve which is connected with the die makes the material channel cross-sectional area inside the die extruding head less than the cross-sectional area of the screw conveying material channel. The material channel inside the extruding head is not paralleled with the screw, which can make the die improve the extrusion force in the process of conveying the material, and improve screw extruding granulation forming degree. The invention contains an extruding head 5, a template 8 and a rotating knife 12. The template is provided with a cone shaped material guide part 7. A cone shaped cavity 9 is arranged inside the extruding head 5. The cone shaped material guide part 7 and the cone shaped cavity 9 are sheathed and formed the material channel inside the extruding head 5. An outlet of the material channel is corresponding to the place of a material hole on the template 8. The invention takes in the cross-sectional area of the material channel inside the extruding head, and so the pressure bore by the materials in the material channel is enhanced, through which the materials can stick together well, and the intensity of finish degree of the grains extruded from the material hole are improved. And also the total material feed quality conveyed by screw into the extruding head is small, and the volume of the material is small, and so the pressure and the flow rate must be increased. The material, which is flowed out of the material hole, is not extruded slowly, but is ejected from the material hole. The ejected materials can be cut into regular grains by the rotating knife on the material port, through which ensures the production required forming degree to be achieved. The invention is easy to implement, and has good implementation effect.

Description

technical field [0001] The invention relates to a method and equipment for making powdery materials into granules by extrusion, in particular to a method for improving the forming degree of granules after screw extrusion and the machine head used. Background technique [0002] The existing extrusion granulation methods are all, after the powdery material is mixed with a liquid, it is added to the hopper, conveyed and extruded in the material channel by a screw, and extruded from a porous template to form granules, so as to achieve the purpose of granulation. The shape of the particles is Cylindrical, the particle size of the material can be changed by changing the diameter of the material hole on the template, but the material channel in the extrusion head of this extrusion granulation method is a hollow cylinder, and the material holes are distributed throughout the template, resulting in the material being in the extrusion head. The inside cannot be well pressed and bonded...

AI Technical Summary

Problems solved by technology

[0002] Existing extrusion granulation methods are all, after the powdery material is mixed with liquid, it is added to the hopper, conveyed and extruded in the material channel by the screw, and extruded from the porous template to form granules, so as to achieve the purpose of granulation. The shape of the particles is Cylindrical, the particle size of the material can be changed by changing the diameter of the material hole on the template, but the material channel in the extrusion head of this extrusion granulation method is a hollow cylinder, and the material holes are distributed throughout the template, resulting in the material being in the extrusion head. The inside cannot be well pressed and bonded tightly, and the strength of the processed material particles is low; and the cross-section of the material channel conveyed by the screw and the material channel in the extrusion head does not change, and the material is extruded smoothly from the material hole on the template, and is easy to sag naturally. Falling or being broken by rotating blades, the particle forming rate is low and the size is irregular

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