CN220297772U - Conical screw and double-screw extruder - Google Patents
Conical screw and double-screw extruder Download PDFInfo
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- CN220297772U CN220297772U CN202321972933.8U CN202321972933U CN220297772U CN 220297772 U CN220297772 U CN 220297772U CN 202321972933 U CN202321972933 U CN 202321972933U CN 220297772 U CN220297772 U CN 220297772U
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- 238000001125 extrusion Methods 0.000 claims abstract description 44
- 230000006835 compression Effects 0.000 claims abstract description 32
- 238000007906 compression Methods 0.000 claims abstract description 32
- 230000002093 peripheral effect Effects 0.000 claims abstract description 5
- 230000007423 decrease Effects 0.000 claims abstract description 4
- 230000010006 flight Effects 0.000 claims description 15
- 230000007547 defect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The utility model discloses a conical screw and a double-screw extruder, wherein the conical screw comprises a first feeding section, a second feeding section, a first plasticizing section, a second plasticizing section, a first compression extrusion section and a second compression extrusion section which are sequentially arranged at intervals along a screw body; the outer diameter of the conical screw gradually decreases along the direction from the first feeding section to the second compression extrusion section; the length of the first feeding section is smaller than that of the second feeding section so as to reduce the reverse pressure of the second feeding section, and the direction from the second feeding section to the first feeding section is reversed; the ratio of the length of the conical screw to the maximum outer diameter of the conical screw is 15.8 to 1 to 17.8 to 1; the peripheral surface of the screw rib of the second plasticizing section extends along the screw involute. The conical screw provided by the utility model has the advantages that the length-diameter ratio of the screw is changed by optimally designing the geometric shape of the screw to overcome the defects of the conventional conical screw in the background art, so that the extrusion effect is presented in a concise and efficient mode.
Description
Technical Field
The utility model relates to the field of plastic pipe extrusion processing, in particular to a conical screw and a double-screw extruder.
Background
The plastic pipe has the characteristics of light weight, corrosion resistance, attractive appearance, no bad smell, easy processing, convenient construction and the like, and is increasingly widely applied in building engineering. The processing of the plastic pipe is not separated from the extrusion equipment. Referring to fig. 1, most of the existing extrusion devices are conical twin-screw extruders 300, the aspect ratio of the old screw 301 and the old barrel 302 of the existing extruder 300 is generally larger, the geometric redundancy of the old screw 301 is complex (the screw edges of the first plasticizing section, the second plasticizing section, the first compression extrusion section and the second compression extrusion section are provided with grooves and the like), the old barrel 302 is thicker, not only the manufacturing raw materials are wasted, but also a large amount of electric energy is wasted for heating during use, the extrusion speed is slow, and the extrusion quality is not easy to control. An extrusion device with high extrusion speed, easy control of extrusion quality, energy saving and emission reduction is urgently needed.
Disclosure of Invention
It is an object of the present utility model to provide a new solution for conical screw and twin screw extruders.
The first aspect of the utility model provides a conical screw comprising a screw body; the screw extruder comprises a screw body, wherein a first feeding section, a second feeding section, a first plasticizing section, a second plasticizing section, a first compression extrusion section and a second compression extrusion section are sequentially arranged at intervals along the length direction of the screw body, and screw edges are respectively and correspondingly arranged on the peripheries of the first feeding section, the second feeding section, the first plasticizing section, the second plasticizing section, the first compression extrusion section and the second compression extrusion section; the outer diameter of the conical screw gradually decreases along the direction from the first feeding section to the second compression extrusion section; the length of the first feeding section is smaller than that of the second feeding section so as to reduce the reverse pressure of the second feeding section, and the direction from the second feeding section to the first feeding section is reversed; the ratio of the length of the conical screw to the maximum outer diameter of the conical screw is 15.8 to 1 to 17.8 to 1; the peripheral surface of the screw rib of the second plasticizing section extends along the screw involute.
Alternatively, the ratio of the length of the conical screw to the maximum outer diameter of the conical screw is 16.8 to 1.
Optionally, the pitch of the screw flights of the first feeding section is 14mm-18mm; and/or the thickness of the screw edges of the first feeding section is 4.5mm-6.5mm.
Optionally, the pitch of the flights of the first feed section is 16mm and/or the flight thickness of the flights of the first feed section is 5.5mm.
Optionally, the pitch of the screw flights of the first feeding section is 0.6 times the pitch of the screw flights of the second feeding section; and/or the screw edge thickness of the screw edge of the first feeding section is 0.6 times of the screw edge thickness of the screw edge of the second feeding section.
Optionally, the length of the second feeding section is 457mm-477mm.
Optionally, the length of the first plasticizing section is 55mm-65mm and/or the length of the second plasticizing section is 109mm-129mm.
Optionally, the length of the first plasticizing section is 60mm and/or the length of the second plasticizing section is 119mm.
Optionally, the flight thickness of the flight of the first compression extrusion section is 11.1mm to 12.1mm; and/or the length of the flight of the second compression extrusion section is 470mm to 480mm.
The second aspect of the utility model discloses a double-screw extruder comprising a barrel and a screw, wherein the screw comprises the conical screw of any one of the first aspects of the utility model, and the peripheral wall of the barrel comprises a plurality of cylindrical surfaces which are connected in sequence.
The embodiment disclosed by the utility model has the following beneficial effects:
the conical screw provided by the utility model has the advantages that the length-diameter ratio of the screw is changed by optimizing the geometric shape of the screw (old 20.1:1 is changed into 15.8:1 to 17.8:1) aiming at the defects of the existing conical screw in the background art, so that the extrusion effect is shown in a concise and efficient mode. The geometry of the screw flight is optimally designed (the first feeding section is arranged at the front end of the second feeding section), so that the reverse pressure of the feeding section is effectively eliminated, and the feeding efficiency is indirectly improved. The experimental result obtained in the comparison of the internal experiments in the factory is about 20% of manufacturing procedures, about 10% of manufacturing raw materials are saved, the extrusion yield is improved by 60%, and the electric energy is saved by 30%.
Other features of the present utility model and its advantages will become apparent from the following detailed description of exemplary embodiments of the utility model, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description, serve to explain the principles of the utility model.
FIG. 1 is a block diagram of an extruder of the background art;
FIG. 2 is a block diagram of a twin screw extruder according to an embodiment;
fig. 3 is a view showing a construction of a conical screw of a twin-screw extruder according to an embodiment.
The figures are marked as follows:
100-conical screw, 101-first feeding section, 102-second feeding section, 103-first plasticizing section, 104-second plasticizing section, 105-first compression extrusion section, 106-second compression extrusion section, 200-barrel, 300-extruder, 301-old screw, 302-old barrel.
Detailed Description
Various exemplary embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise.
The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the utility model, its application, or uses.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.
With reference to fig. 2 and 3, this embodiment provides a twin-screw extruder, including: the machine barrel 200 and the conical screw 100 are characterized in that two inner holes are arranged in the machine barrel 200 in parallel along the length direction, and each inner hole is internally provided with one conical screw 100. The conical screw 100 comprises a screw body; along the length direction of the screw body, a first feeding section 101, a second feeding section 102, a first plasticizing section 103, a second plasticizing section 104, a first compression extrusion section 105 and a second compression extrusion section 106 are sequentially arranged at intervals, and screw edges 107 are respectively and correspondingly arranged on the peripheries of the first feeding section 101, the second feeding section 102, the first plasticizing section 103, the second plasticizing section 104, the first compression extrusion section 105 and the second compression extrusion section 106; the outer diameter of the conical screw 100 gradually decreases in the direction from the first feeding section 101 to the second compression extrusion section 106; the length of the first feeding section 101 is smaller than that of the second feeding section 102 so as to reduce the reverse pressure of the second feeding section 102 and reverse the direction from the second feeding section 102 to the first feeding section 101; the ratio of the length of the conical screw 100 to the maximum outer diameter of the conical screw 100 is 15.8 to 1 to 17.8 to 1, preferably 16.8 to 1, i.e., the length of the conical screw 100 to the maximum inner diameter of the single inner bore of the barrel 200 is 16.8 to 1; the outer circumferential surface of the screw flight 107 of the second plasticizing section 104 extends along the screw involute. The pitch of the screw flights 107 of the first feeding section 101 is 14mm-18mm, preferably the pitch of the screw flights 107 of the first feeding section 101 is 16mm; the thickness of the screw flight 107 of the first feeding section 101 is 4.5mm-6.5mm, preferably the thickness of the screw flight 107 of the first feeding section 101 is 5.5mm. The length of the second feeding section 102 is 457mm-477mm, preferably 467mm. The length of the first plasticizing section 103 is 55mm-65mm, preferably 60mm; the length of the second plasticizing section 104 is 109mm-129mm, preferably 119mm. The thickness of flight 107 of first compression extrusion section 105 is 11.1mm to 12.1mm, preferably 11.6mm; the length of flight 107 of second compression extrusion section 106 is 470mm to 480mm, preferably 475mm. The pitch of the screw flights 107 of the first feeding section 101 is 0.6 times the pitch of the screw flights 107 of the second feeding section 102; the thickness of the lands 107 of the first feeding section 101 is 0.6 times the thickness of the lands 107 of the second feeding section 102. The lead of flight 107 of first compression extrusion section 105 is less than the lead of flight 107 of second compression extrusion section 106.
In summary, the dimensions of the present utility model are simulated or experimentally based on rigorous modeling data on a computer to determine the optimum aspect ratio of the conical screw 100 to be 17.8:1, thereby determining the length of the barrel 200 and conical screw 100. Meanwhile, by reducing 45% -50% of the outer diameter of the cylinder in the prior art and removing the complex grooves on the outer wall of the cylinder, reasonable wall thickness of the cylinder (the wall thickness of the cylinder with the grooves of the original double-screw extruder is thicker, the heating is slow, and the relative cooling is slow. The conical screw 100 eliminates complex screw flights and redundant grooves (screw flights of a first plasticizing section, a second plasticizing section, a first compression extrusion section and a second compression extrusion section in the prior art are provided with grooves), optimally designs the geometric shape of the screw flights (the first feeding section 101 is arranged at the front end of the second feeding section 102, so that the reverse pressure of the feeding section is effectively eliminated, and indirectly improves the feeding efficiency). The conical screw 100 fits into the barrel 200 at the conical barrel inner diameter. The manufacturing process is reduced by about 20 percent (in the experimental comparison in the factory), the manufacturing raw materials are saved by about 10 percent, the extrusion yield is improved by 60 percent, and the electric energy is saved by 30 percent.
While certain specific embodiments of the utility model have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the utility model. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the utility model. The scope of the utility model is defined by the appended claims.
Claims (10)
1. A conical screw, comprising:
a screw body;
the screw extruder comprises a screw body, wherein a first feeding section, a second feeding section, a first plasticizing section, a second plasticizing section, a first compression extrusion section and a second compression extrusion section are sequentially arranged at intervals along the length direction of the screw body, and screw edges are correspondingly arranged on the peripheries of the first feeding section, the second feeding section, the first plasticizing section, the second plasticizing section, the first compression extrusion section and the second compression extrusion section respectively;
the outer diameter of the conical screw gradually decreases along the direction from the first feeding section to the second compression extrusion section;
the length of the first feeding section is smaller than that of the second feeding section so as to reduce the reverse pressure of the second feeding section, wherein the reverse direction is the direction from the second feeding section to the first feeding section;
the ratio of the length of the conical screw to the maximum outer diameter of the conical screw is 15.8 to 1 to 17.8 to 1;
the peripheral surface of the screw rib of the second plasticizing section extends along the screw involute.
2. The conical screw of claim 1, wherein the ratio of the length of the conical screw to the maximum outer diameter of the conical screw is 16.8 to 1.
3. The conical screw according to claim 1 or 2, wherein the pitch of the flights of the first feed section is 14mm-18mm;
and/or the thickness of the screw edges of the first feeding section is 4.5mm-6.5mm.
4. A conical screw according to claim 3, wherein the pitch of the flights of the first feed section is 16mm and/or the flight thickness of the flights of the first feed section is 5.5mm.
5. The conical screw of claim 1 or 2, wherein the pitch of the flight of the first feed section is 0.6 times the pitch of the flight of the second feed section;
and/or the screw edge thickness of the screw edge of the first feeding section is 0.6 times of the screw edge thickness of the screw edge of the second feeding section.
6. The conical screw according to claim 1 or 2, wherein the length of the second feeding section is 457mm-477mm.
7. The conical screw according to claim 1 or 2, characterized in that:
the length of the first plasticizing section is 55mm-65mm, and/or the length of the second plasticizing section is 109mm-129mm.
8. The conical screw of claim 7, wherein:
the length of the first plasticizing section is 60mm and/or the length of the second plasticizing section is 119mm.
9. The conical screw according to claim 1 or 2, characterized in that:
the thickness of the screw flight of the first compression extrusion section is 11.1mm-12.1mm;
and/or the length of the screw flight of the second compression extrusion section is 470mm-480mm.
10. A twin screw extruder comprising a barrel and a screw, wherein the screw comprises the conical screw of any one of claims 1-9, and the peripheral wall of the barrel comprises a plurality of sequentially connected cylindrical surfaces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321972933.8U CN220297772U (en) | 2023-07-25 | 2023-07-25 | Conical screw and double-screw extruder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321972933.8U CN220297772U (en) | 2023-07-25 | 2023-07-25 | Conical screw and double-screw extruder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220297772U true CN220297772U (en) | 2024-01-05 |
Family
ID=89345970
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321972933.8U Active CN220297772U (en) | 2023-07-25 | 2023-07-25 | Conical screw and double-screw extruder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220297772U (en) |
-
2023
- 2023-07-25 CN CN202321972933.8U patent/CN220297772U/en active Active
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