Co-rotating differential multi-screw extruding machine with gradually changing type thread number and machining method thereof

Abstract

The invention discloses a co-rotating differential multi-screw extruding machine with the gradually changing type thread number and a machining method thereof. A first threaded rod in the extruding machine comprises two single-start thread elements, three single-start-gradually-changed-to-double-start transition thread elements, a double-start thread element and three double-start-gradually-changed-to-single-start transition thread elements; and a second threaded rod comprises two double-start thread elements, three double-start-gradually-changed-to-four-start transition thread elements, a four-start thread element and three four-start-gradually-changed-to-double-start transition thread elements. According to the machining method, a threaded rod mechanism achieves five enhancement mixing mechanisms by adopting the structure of the threaded rod mechanism, and conducts all-sided enhancement mixing on materials.

Description

technical field [0001] The invention relates to the technical field of twin-screw extruders, in particular to a co-rotating differential-speed multi-screw extruder and a processing method thereof. Background technique [0002] The co-rotating twin-screw extruder with self-cleaning function is a widely used mixing processing equipment at present. This type of equipment mainly includes a barrel and two twin-screws installed in parallel in the inner cavity of the barrel. This type of equipment mainly adopts building block structure to adapt to various material systems. The mixing effect is improved by adopting structures such as multi-thread structure and reinforced kneading block. However, the structure of the flow channel is symmetrical, and it is impossible to introduce tensile field strengthening. Dispersion effect. In order to achieve high dispersibility, a large number of kneading blocks with wider disks are used, and high speed is used to increase the shear rate, which...

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Problems solved by technology

This type of equipment mainly adopts building block structure to adapt to various material systems. The mixing effect is improved by adopting structures such as multi-thread structure and reinforced kneading block. However, the structure of the flow channel is symmetrical, and it is impossible to introduce tensile field strengthening. dispersion effect

In order to achieve high dispersibility, a large number of kneading blocks with wider disks are used, and high speed is used to increase the shear rate, which in turn brings about a decrease in the mixing effect caused by a decrease in the residence time, and a longer length of time has to be used. Diameter ratio to prolong residence time

Moreover, the use of a large number of kneading blocks destroys the axial conveying capacity and self-cleaning function, which leads to dry friction between the screws and makes it difficult to control the temperature, which brings many problems such as high energy consumption, low efficiency and material degradation.

Even so, it is not competent for the processing of material systems with high mixing requirements. In engineering, a two-stage combined structure of continuous banburying and co-rotating twin-screws is chosen. Although it meets some demanding processing requirements, there are problems such as very high equipment costs, There are both co-rotating twin-screw components and internal mixer components, which are difficult to operate and maintain, large and complex in structure, occupying a large area, and environmental pollution.

In recent years, with the in-depth study of chaotic mixing dynamics, the symmetry breaking effect and tensile force field have been introduced into the field of twin-screw technology, but there is still a lack of topological chaotic effect of channel segmentation, and the effect of the tensile field generated by forced compression is weak. There is still a lot of room for improvement in the melt blending and venting functions of the twin-screw extrusion process

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