Stepped twin-screw extrusion device and bulking machine

Abstract

The invention discloses a stepped twin-screw extrusion device and a bulking machine which comprises twin screws arranged in parallel, wherein screw configuration of the twin screws adopts a stepped variable pitch double-threaded screw structure; and the twin screws comprise a 2-time screw diameter coarse pitch double-threaded screw structure, a three-forward kneading block, a 1.5-time twin-screw structure, a primary three-forward three-backward kneading block, a one-time twin-screw structure, a secondary three-forward three-backward kneading block, a primary one-time slotted twin-screw structure, a double-threaded inverted screw structure, a secondary one-time slotted twin-screw structure and a discharging conical screw structure which are connected in sequence from a feeding hole in the front end of the screw to a discharging hole. According to the stepped twin-screw extrusion device and the bulking machine, retention time of materials in a chamber of the bulking machine is long, thekneading effect is excellent, the pressure in the chamber is uniform, the product stability is high, discharging uniformity is realized, the product is uniform in material form and excellent in kneading effect, the material curing degree is excellent, and the machine is suitable for producing high-oil low-starch (with starch content of 10% or less) high-grade floating and sinking feed.

Description

technical field [0001] The invention relates to the technical field of extruders, in particular to a stepped twin-screw extruder and an extruder. Background technique [0002] Traditional twin-shaft extruders use double the diameter of the screw, that is, double the pitch. The screw pitch of the extruder is set at the same pitch so that the material enters and exits in the same state, and the mold output uniformity of the extruder is affected by the modulus at the outlet of the extruder. And pressure, due to the reduction of the outlet, the reduction of the number of holes and the greater pressure on the template will cause the load of the host to be too high, which will affect the service life of the host and the quality of the extruded material. Moreover, the current of the traditional spiral configuration is high, the material maturity is not good, and the production capacity is not high. [0003] Chinese patent literature (announcement date: June 27, 2017, announcement ...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of the existing extruder templates with high pressure, high host load, short service life, uneven quality of extruded materials, etc., the traditional spiral configuration has high current, and the material maturity is not good. To solve the problem of low production capacity, it is necessary to provide a ladder that can increase the filling coefficient of the material entering the extruder. By changing the spiral, the material filling coefficient can be changed more naturally, the load of the host machine can be reduced, the service life of the host machine can be prolonged, and the quality of material extrusion can be improved. Type twin-screw extrusion device and puffing machine

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