CN218892199U

CN218892199U - Flat double screw with double exhaust sections and double throttling sections

Info

Publication number: CN218892199U
Application number: CN202222984090.5U
Authority: CN
Inventors: 张伟光
Original assignee: Guangdong Liansu Machinery Manufacturing Co Ltd
Current assignee: Guangdong Liansu Machinery Manufacturing Co Ltd
Priority date: 2022-11-08
Filing date: 2022-11-08
Publication date: 2023-04-21
Anticipated expiration: 2032-11-08

Abstract

The utility model provides a double-exhaust-section double-throttling-section flat double screw, which comprises a screw main body, wherein a feeding conveying section, a first plasticizing section, a first throttling section, a natural exhausting section, a second plasticizing section, a second throttling section, a vacuum exhausting section and a metering extruding section are arranged on the screw main body from left to right, the thread lead of the second throttling section is smaller than that of the first throttling section and smaller than that of the second plasticizing section, and the thread lead of the metering extruding section is smaller than that of the first plasticizing section and smaller than that of the feeding conveying section and smaller than that of the vacuum exhausting section.

Description

Flat double screw with double exhaust sections and double throttling sections

Technical Field

The utility model relates to a double-exhaust section double-throttling section flat double-screw.

Background

The existing PVC raw material conveying extrusion screw is not uniform enough in material plasticization in actual production, and the screw has poor adaptability to different PVC formulas.

Disclosure of Invention

In order to solve the problems, the utility model provides a double-exhaust-section double-throttling-section flat double screw rod, and aims to solve the problems that the PVC raw material conveying extrusion screw rod is not uniform enough in material plasticization in actual production and the adaptability of the screw rod to different PVC formulas is poor.

In one or more embodiments, the feed delivery section and the vacuum exhaust section are triple-start threads.

In one or more embodiments, the first plasticizing section, the first throttle section, the second plasticizing section, and the metering extrusion section are all double-start threads.

In one or more embodiments, the second restriction is a single start thread.

In one or more embodiments, the natural gas exhaust section is 4-start threads.

In one or more embodiments, the threaded surface of the vacuum exhaust section is provided with a plurality of grooves.

Principle of:

PVC raw materials enter a screw from a feeding conveying section, and reach a first plasticizing section under the pushing of screw edges and the heating friction of a machine barrel, and the raw materials are primarily plasticized under the compression of resistance generated by a first throttling section;

2. next, entering a natural exhaust section, loosening the raw materials from a compact state under the action of a large-lead multi-head screw edge, and opening an exhaust port at a corresponding position of a machine barrel to volatilize moisture in the raw materials from the machine barrel naturally at high temperature;

3. under the pushing of the screw edges, the raw materials in the semi-plasticizing state enter the second plasticizing section, the second throttling section generates resistance, the materials are continuously stirred and mixed, and the plasticizing of the materials is more uniform.

4. The plasticized raw material enters a vacuum exhaust section, micromolecular volatile matters of the raw material are pumped into a separating cylinder under the vacuum state, and finally the raw material enters a metering extrusion section.

The utility model has the beneficial effects that: PVC raw materials are subjected to primary plasticizing, scattering and exhausting, plasticizing and vacuum exhausting, the screw rod uses minimum shearing force to plasticize the materials uniformly, and the screw rod has good adaptability to different PVC formulas.

Drawings

FIG. 1 is a schematic view of a flat twin screw with dual exhaust sections and dual restriction sections.

Detailed Description

The present application is further described with reference to the following drawings:

referring to fig. 1, a double-exhaust-section double-throttling-section flat double screw comprises a screw body, wherein a feeding conveying section 1, a first plasticizing section 2, a first throttling section 3, a natural exhausting section 4, a second plasticizing section 5, a second throttling section 6, a vacuum exhausting section 7 and a metering extruding section 8 are arranged on the screw body from left to right, the thread lead of the second throttling section 6 is smaller than that of the first throttling section 3 and smaller than that of the second plasticizing section 4, the thread lead of the first plasticizing section 2 is smaller than that of the metering extruding section 8, and the thread lead of the feeding conveying section 1 is smaller than that of the vacuum exhausting section 7 and smaller than that of the natural exhausting section 4.

Further, the feeding conveying section 1 and the vacuum exhausting section 7 are three-start threads.

Further, the first plasticizing section 2, the first throttling section 6, the second plasticizing section 5 and the metering extrusion section 8 are all double-ended threads.

Further, the second throttling section 6 is a single-start thread.

Further, the natural exhaust section is a 4-start thread.

Further, a plurality of grooves 71 are provided on the screw surface of the vacuum exhaust section 7.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "first", second "may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

The above-mentioned preferred embodiments should be regarded as illustrative examples of embodiments of the present application, and all such technical deductions, substitutions, improvements and the like which are made on the basis of the embodiments of the present application, are considered to be within the scope of protection of the present patent.

Claims

1. The utility model provides a flat twin-screw of two throttle sections of double exhaust section, its characterized in that, includes the screw rod main part, be provided with feed conveying section, first plasticization section, first throttle section, natural exhaust section, second plasticization section, second throttle section, vacuum exhaust section and measurement extrusion section from left to right on the screw rod main part, the screw thread lead of second throttle section is less than first throttle section screw thread lead and is less than second plasticization section screw thread lead and is less than first plasticization section screw thread lead and is less than measurement extrusion section screw thread lead and is less than feed conveying section screw thread lead and is less than vacuum exhaust section screw thread lead and is less than natural exhaust section screw thread lead.

2. The dual exhaust section dual throttle section flat twin screw of claim 1, wherein the feed delivery section and the vacuum exhaust section are triple flighted.

3. The twin screw twin throttle twin screw as defined in claim 1 in which the first and second plasticizing and metering extrusion sections are twin screw flights.

4. The dual exhaust section dual throttle section flat twin screw of claim 1, wherein the second throttle section is a single start thread.

5. The dual exhaust section dual throttle section flat twin screw of claim 1, wherein the natural exhaust section is 4-start flighted.

6. The dual exhaust section dual throttle section flat twin screw of claim 1, wherein the vacuum exhaust section has a plurality of grooves disposed on a threaded surface thereof.