CN215203386U - Special extrusion screw for efficient granulation of flat-double polyvinyl chloride powder - Google Patents
Special extrusion screw for efficient granulation of flat-double polyvinyl chloride powder Download PDFInfo
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- CN215203386U CN215203386U CN202120678516.7U CN202120678516U CN215203386U CN 215203386 U CN215203386 U CN 215203386U CN 202120678516 U CN202120678516 U CN 202120678516U CN 215203386 U CN215203386 U CN 215203386U
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Abstract
A special extrusion screw for efficient granulation of flat-twin polyvinyl chloride powder comprises twin screws which are parallel in different directions, and the screw is sequentially divided into a feeding section, a compression section, a secondary compression section, a material blocking section, an exhaust section, a plasticizing section and a mixing section along the length direction from feeding to discharging; wherein the screw pitch of the screw edges of the feeding section is the same and the depth of the screw grooves is the same; the meshing clearance between the two screws of the compression section and the secondary compression section is reduced, and a cavity generated by meshing of the two screws is reduced; the meshing clearance of the double screws of the material blocking section is further reduced; the volume of a cavity of the exhaust section is increased, the volume of the cavity of the plasticizing section is smaller than that of the exhaust section, and the length-diameter ratio of the screw is 23: 1-25: 1. The utility model has the characteristics of structural design is reasonable, the shearing melting is abundant, product quality is good, makes the polyvinyl chloride brace of extruding extrude stably, and intensity is high, and the filter effect ideal, work efficiency is high moreover, and the power consumption is few.
Description
Technical Field
The utility model belongs to the technical field of macromolecular material processing machinery, a screw rod structure of extruder is related to, especially relate to a special screw rod of extruding of high-efficient granulation of flat two polyvinyl chloride powder.
Background
The extruder is used for fully mixing and extruding one or more granular raw materials and outputting the raw materials, and is mainly used in the field of plastic or rubber manufacturing. When the extruder is in operation, the raw materials are heated to be viscous flow, and under the condition of pressurization, the raw materials are made to pass through a neck mould with a certain shape to form a continuous body with a cross section similar to the shape of the neck mould, then the continuous body is cooled to enable the raw materials with a certain geometric shape and size to be changed from a viscous flow state to a high elastic state, and finally the raw materials are cooled and shaped to be glass state, so that the required product is obtained.
The phi 90/24 anisotropic parallel double-screw extruder is used for outputting modified PVC granules after PVC powder is mixed with other auxiliary materials and fully mixed and extruded. The counter-rotating parallel double-screw extruder is characterized in that plastic enters a screw and a machine barrel through a feed opening of the extruder, the screw is meshed with the screw to form a closed or semi-closed cavity, thrust perpendicular to a bevel face is generated on the plastic through the bevel face rotated by the two screws, the plastic is pushed forwards, and in the pushing process, due to friction between the plastic and the screw, between the plastic and the machine barrel, change of the volume of the cavity meshed with the double screws and friction among particles, the machine barrel is heated and gradually melted, discharged materials contain certain mixed gas after being melted, and the melted plastic is discharged through a die and becomes a qualified product after passing through a water ring granulator. If the screw structure is unreasonable, the water in the extruded PVC granules is not completely drained, the melting is poor, the extrusion amount is low, no economic benefit is generated, and the competitive advantage is lost.
Through the inspection, chinese patent "a flat two screw rods that extrude" that current patent number is CN202020173093.9, including the body of rod and spiral shell arris, the body of rod is the cylindricality, and the spiral shell arris includes the feed zone, melting section and ejection of compact section, and the melting section comprises the single spiral shell arris section and the double spiral arris section of mutual discontinuity, is provided with on the double spiral arris section that is close to the body of rod discharge end to be the heliciform backward flow groove, and the spiral direction of backward flow groove is opposite with the spiral arris direction of the body of rod, and the spiral arris interval that is provided with the backward flow groove both is less than the spiral arris interval of any department of feed zone, is less than the spiral arris interval of any department of ejection of compact section again, and the ejection of compact section comprises one section of ejection of compact and ejection of compact two sections of mutual discontinuity, and the pitch of one section of ejection of compact is greater than the ejection of compact two sections, the draw ratio of the body of rod is 32 ~ 40. However, the design of the screw is not reasonable enough, and the compression propulsion and melting effects are not ideal, so that the special extrusion screw for efficient granulation of flat-twin polyvinyl chloride powder, which has good extrusion effect and sufficient shearing and melting, needs to be developed.
Disclosure of Invention
The utility model aims to solve the technical problem that to foretell technical current situation and provide a special screw rod of extruding of high-efficient granulation of flat two polyvinyl chloride powder, have that structural design is reasonable, the shearing melting is abundant, extrude stable characteristics.
The utility model provides a technical scheme that above-mentioned technical problem adopted does: the utility model provides a special screw rod of extruding of high-efficient granulation of flat two polyvinyl chloride powder, is equipped with the flight along length direction on the face of cylinder of screw rod including the parallel twin-screw of incorgruous, and the flight forms spiral groove and spiral shell arris, its characterized in that with the screw rod: the screw is sequentially divided into a feeding section, a compression section, a secondary compression section, a material blocking section, an exhaust section, a plasticizing section and a mixing section along the length direction from feeding to discharging; wherein the screw pitch of the screw edges of the feeding section is the same and the depth of the screw grooves is the same; the meshing clearance between the two screws of the compression section and the secondary compression section is reduced, and a cavity generated by meshing of the two screws is reduced; the meshing clearance of the double screws of the material blocking section is further reduced; the volume of a cavity of the exhaust section is increased, the volume of the cavity of the plasticizing section is smaller than that of the exhaust section, and the length-diameter ratio of the screw is 23: 1-25: 1.
As an improvement, the screw pitch of the screw edge of the compression section is smaller than that of the feeding section, the screw pitch of the screw edge of the secondary compression section is larger than that of the feeding section, and the length of the secondary compression section is smaller than that of the compression section.
Furthermore, the included angle between the spiral sheet of the material blocking section and the screw rod is 80-90 degrees, the meshing clearance of the double screws of the material blocking section is reduced, and the cavity of the material is reduced.
Furthermore, the screw pitch of the spiral edge of the exhaust section is larger than that of the secondary compression section, the meshing clearance of the double screws of the exhaust section is increased, and the length of the exhaust section is larger than that of the secondary compression section and smaller than that of the compression section.
Furthermore, the screw pitch of the screw edge of the plasticizing section is larger than that of the secondary compression section and smaller than that of the exhaust section, and the length of the plasticizing section is smaller than that of the exhaust section and larger than that of the secondary compression section.
Furthermore, one row or a plurality of rows of pins are arranged on the cylindrical surface of the screw of the mixing section.
And furthermore, the tail end of the mixing section is conical, and the pins are rhombic pins in 5-6 rows.
And finally, the length of the material blocking section is not more than that of the mixing section.
Compared with the prior art, the utility model has the advantages of: the structure of the screw is reasonably designed, and the screw with the length-diameter ratio of 24:1 is adopted, so that the polyvinyl chloride raw material can be fully melted and plasticized in the screw; the compression section and the secondary compression section are arranged, so that the shearing rate of the plastic is increased due to the fact that a cavity generated by meshing of the double screws is reduced in the pushing process of the polyvinyl chloride raw material, the dispersing and mixing effect is good, and meanwhile, the outer part of the machine barrel is heated and gradually melted; the material blocking section is arranged, so that the meshing clearance between the screw lead and the double screws is reduced, and the phenomenon that the cavity blocks the polyvinyl chloride melt which flows back in front is reduced; the mixing section is arranged, so that when the molten material flows through the mixing section, shearing heating is generated, and the unmelted material is plasticized. The utility model has the characteristics of structural design is reasonable, the shearing melting is abundant, product quality is good, makes the polyvinyl chloride brace of extruding extrude stably, and intensity is high, and the filter effect ideal, work efficiency is high moreover, and the power consumption is few.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
As shown in figure 1, the special extrusion screw for efficient granulation of flat-twin polyvinyl chloride powder comprises twin screws 1 which are parallel in different directions, wherein the cylindrical surface of the screw 1 is provided with a spiral sheet 2 along the length direction, the spiral sheet 2 and the screw 1 form a spiral groove and a spiral edge, the screw 1 is sequentially divided into a feeding section A, a compression section B, a secondary compression section C, a material blocking section D, an exhaust section E, a plasticizing section F and a mixing section G along the length direction from feeding to discharging, wherein the spiral pitch of the spiral edge of the feeding section A is the same, the depth of the spiral groove is the same, polyvinyl chloride powder enters a feeding hole of a machine barrel and is meshed with the twin screws to form a closed or semi-closed cavity, plastic is forced to move forwards through positive displacement conveying, the spiral pitch of the spiral edge of the compression section B is smaller than that of the feeding section A, the spiral pitch of the spiral edge of the secondary compression section C is larger than that of the feeding section A, the length of the secondary compression section C is smaller than that of the compression section B, and the meshing gap between the twin screws 1 of the compression section B and the secondary compression section C is smaller, in the pushing process of the polyvinyl chloride raw material, because a cavity generated by meshing of the double screws is reduced, the shearing rate of the plastic is increased, the dispersing and mixing effect is good, meanwhile, the machine barrel is heated to be gradually melted outside, the included angle between the spiral blade 2 of the material blocking section D and the screw rod 1 is 80-90 degrees, the meshing gap between the lead of the screw rod 1 and the double screws 1 is reduced, the pressure of the melted material in the section is increased by reducing the cavity, the polyvinyl chloride melt flowing back in front is blocked, the screw pitch of the spiral edge of the exhaust section E is larger than that of the secondary compression section C, the meshing gap between the double screws of the exhaust section E is increased, the volume of the cavity is increased, the length of the exhaust section E is larger than that of the secondary compression section C and smaller than that of the compression section B, the polyvinyl chloride raw material contains certain humidity, the melted material contains certain mixed gas, the cavity is enlarged by increasing the meshing gap between the lead of the screw rod 1 and the double screws 1, the pressure borne by the melted material is reduced, the contained gas is pumped away after reaching the exhaust port, the screw pitch of the plasticizing section F is greater than that of the secondary compression section C and is less than that of the exhaust section E, the length of the plasticizing section F is less than that of the exhaust section E and is greater than that of the secondary compression section C, the cavity is enlarged by changing the meshing clearance between the screw pitch lead and the twin-screw to ensure that the polyvinyl chloride melt is more uniform, one or more rows of pins 3 are arranged on the cylindrical surface of the screw 1 of the mixing section G, the tail end of the mixing section G is conical, the pins 3 are 5-6 rows of rhombic pins, when the molten material flows through the mixing section G, shearing heating is generated, and the unmelted material can be plasticized.
Aspect ratio 24 of screw 1 of the present embodiment: 1, the polyvinyl chloride raw material can be fully melted and plasticized in the screw, and the generated gas can be effectively discharged from the exhaust port of the cylinder through the exhaust section E of the screw 1.
This embodiment can make the polyvinyl chloride raw materials can carry out abundant shearing melting in screw rod 1 the inside through in-service use, makes the polyvinyl chloride brace extrusion of extruding stable, and intensity is high, and the filter effect is ideal, and work efficiency is high moreover, and the power consumption is few, improves product quality, can satisfy the production needs of incorgruous parallel polyvinyl chloride twin-screw extruder.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. The utility model provides a special screw rod of extruding of high-efficient granulation of flat two polyvinyl chloride powder, is equipped with the flight along length direction on the face of cylinder of screw rod including the parallel twin-screw of incorgruous, and the flight forms spiral groove and spiral shell arris, its characterized in that with the screw rod: the screw is sequentially divided into a feeding section, a compression section, a secondary compression section, a material blocking section, an exhaust section, a plasticizing section and a mixing section along the length direction from feeding to discharging; wherein the screw pitch of the screw edges of the feeding section is the same and the depth of the screw grooves is the same; the meshing clearance between the two screws of the compression section and the secondary compression section is reduced, and a cavity generated by meshing of the two screws is reduced; the meshing clearance of the double screws of the material blocking section is further reduced; the volume of a cavity of the exhaust section is increased, the volume of the cavity of the plasticizing section is smaller than that of the exhaust section, and the length-diameter ratio of the screw is 23: 1-25: 1.
2. The extrusion screw special for efficient granulating of flat-twin polyvinyl chloride powder material as claimed in claim 1, wherein: the screw pitch of the compression section is smaller than that of the feeding section, the screw pitch of the secondary compression section is larger than that of the feeding section, and the length of the secondary compression section is smaller than that of the compression section.
3. The extrusion screw special for efficient granulating of flat-twin polyvinyl chloride powder material as claimed in claim 2, wherein: the included angle between the spiral sheet of the material blocking section and the screw rod is 80-90 degrees, the meshing clearance of the double screws of the material blocking section is reduced, and the cavity of the material is reduced.
4. The extrusion screw special for efficient granulating of flat-twin polyvinyl chloride powder material as claimed in claim 1, wherein: the screw pitch of the spiral arris of the exhaust section is larger than that of the secondary compression section, the meshing clearance of the double screws of the exhaust section is increased, and the length of the exhaust section is larger than that of the secondary compression section and smaller than that of the compression section.
5. The extrusion screw special for efficient granulating of flat-twin polyvinyl chloride powder material as claimed in claim 1, wherein: the screw pitch of the screw edge of the plasticizing section is larger than that of the secondary compression section and smaller than that of the exhaust section, and the length of the plasticizing section is smaller than that of the exhaust section and larger than that of the secondary compression section.
6. The extrusion screw special for efficient granulating of flat-twin polyvinyl chloride powder material as claimed in claim 1, wherein: one or more rows of pins are arranged on the cylindrical surface of the screw of the mixing section.
7. The extrusion screw special for efficient granulating of flat-twin polyvinyl chloride powder material as claimed in claim 6, wherein: the tail end of the mixing section is conical, and the pins are 5-6 rows of rhombic pins.
8. The extrusion screw special for efficient granulating of flat-twin polyvinyl chloride powder material as claimed in claim 1, wherein: the length of the material blocking section is not more than that of the mixing section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120678516.7U CN215203386U (en) | 2021-04-02 | 2021-04-02 | Special extrusion screw for efficient granulation of flat-double polyvinyl chloride powder |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120678516.7U CN215203386U (en) | 2021-04-02 | 2021-04-02 | Special extrusion screw for efficient granulation of flat-double polyvinyl chloride powder |
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| CN215203386U true CN215203386U (en) | 2021-12-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115091644A (en) * | 2022-02-28 | 2022-09-23 | 厦门昊兆科技有限公司 | Novel environment-friendly original granulator |
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2021
- 2021-04-02 CN CN202120678516.7U patent/CN215203386U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115091644A (en) * | 2022-02-28 | 2022-09-23 | 厦门昊兆科技有限公司 | Novel environment-friendly original granulator |
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