CN220946597U - Special screw rod of high-efficient polyvinyl chloride sheath cable extrusion - Google Patents
Special screw rod of high-efficient polyvinyl chloride sheath cable extrusion Download PDFInfo
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- CN220946597U CN220946597U CN202322045961.1U CN202322045961U CN220946597U CN 220946597 U CN220946597 U CN 220946597U CN 202322045961 U CN202322045961 U CN 202322045961U CN 220946597 U CN220946597 U CN 220946597U
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- 229920000915 polyvinyl chloride Polymers 0.000 title claims abstract description 27
- 239000004800 polyvinyl chloride Substances 0.000 title claims abstract description 27
- 238000001125 extrusion Methods 0.000 title claims description 17
- 230000006835 compression Effects 0.000 claims abstract description 31
- 238000007906 compression Methods 0.000 claims abstract description 31
- 238000000926 separation method Methods 0.000 claims abstract description 27
- 229920003023 plastic Polymers 0.000 claims abstract description 22
- 239000004033 plastic Substances 0.000 claims abstract description 22
- 239000007787 solid Substances 0.000 claims abstract description 15
- 230000004888 barrier function Effects 0.000 claims abstract description 10
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 238000013461 design Methods 0.000 abstract description 4
- 238000010924 continuous production Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 13
- 238000002844 melting Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 3
- 239000003063 flame retardant Substances 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000012768 molten material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Landscapes
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The screw is sequentially divided into a feeding section, a separating compression section, a metering section and a barrier section along the length direction from feeding to discharging, wherein the feeding section is a double-thread feeding section, a second spiral sheet parallel to the main spiral sheet is additionally arranged on the feeding section, the outer diameter of the second spiral sheet is consistent with that of the main spiral sheet, and a spiral groove on the feeding section is divided into two with the same width by the second spiral sheet; the separation type compression section is provided with a secondary spiral sheet which plays a role of shielding to separate solid plastic from molten plastic, the outer diameter of the secondary spiral sheet is smaller than that of the main spiral sheet, the main spiral pitch of the separation type compression section is larger than that of the feeding section, and the length-diameter ratio of the screw is 24:1-26:1. The utility model has reasonable structural design, improves the polyvinyl chloride sheath cable plastic in the screw by changing the screw structure, can fully shear and melt, improves the product yield by 20-35%, and simultaneously improves the stability of continuous production quality and the product quality.
Description
Technical Field
The utility model belongs to the technical field of high polymer material processing machinery, relates to a screw structure of an extruder, and particularly relates to a special screw for extruding a high-efficiency polyvinyl chloride sheath cable.
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. The extruder heats the raw materials to be viscous and flowing, the raw materials are pressed and pass through a die with a certain shape to form a continuous body with the cross section similar to the shape of the die, then the continuous body is cooled to change the raw materials with a certain geometric shape and size from the viscous and flowing state to a high-elastic state, and finally the raw materials are cooled and shaped to be a glass state, so that the required product is obtained.
The polyvinyl chloride sheath cable extruder is characterized in that a dried polyvinyl chloride sheath cable material enters a containing cavity between a screw and a machine barrel through a feed opening of the extruder, a thrust vertical to the inclined edge surface is generated on plastic through the inclined edge surface rotated by the screw, the plastic is pushed forward, in the pushing process, the plastic is heated and melted gradually due to friction between the plastic and the screw, friction between the plastic and the machine barrel and friction among particles, the machine barrel is heated outside the machine barrel, the melted plastic enters a machine head through a porous plate through the machine barrel, a core wire enters the machine head through a wire feeding device, the melted plastic is uniformly coated on the core wire in the machine head, and the machine head is cooled and coiled into a required wire cable product under the action of a traction device. If the screw structure is too simple or unreasonable, the yield of the polyvinyl chloride sheath cable is low, the machine, factory building and manual utilization rate is low, and the competitive advantage is lost.
Through investigation, the Chinese patent No. CN202210636713.1 'special extrusion screw for low-smoke halogen-free flame-retardant cable material' comprises a feeding section, a plasticizing section, a BM separating section and a homogenizing section, wherein the special extrusion screw for low-smoke halogen-free flame-retardant cable material is provided with a main thread in the whole course, and the screw pitch S1 of the main thread in the feeding section is equal to the screw diameter D; length l1=5d of the feed section; in the plasticizing section, the main flight pitch S2 is equal to the screw diameter D, the length l2=9d of the plasticizing section; at the BM split section, the main thread pitch S31 suddenly changes to 1.5D; the BM separation section is also provided with liquid phase threads, and the pitch S32 of the liquid phase threads is more than 1.5D; the outer diameter of the liquid thread is smaller than that of the main thread, and the height difference is 1 mm-1.5 mm; the length L3 of the BM section is 7D-8D; in the homogenization section, the main thread pitch S4 suddenly changes to 1D; the length L4 of the homogenizing section is 3D-4D. The screw is divided into four sections, the thrust of the screw to the molten material is increased, the extrusion stability and the extrusion efficiency are improved, but the screw is a special extrusion screw for a smoke zero halogen flame-retardant cable material and is not suitable for extrusion of a polyvinyl chloride sheath cable. It is therefore desirable to develop a special screw for extrusion of polyvinyl chloride sheathing cables to meet production needs.
Disclosure of Invention
The utility model aims to solve the technical problems of providing the special screw for extruding the high-efficiency polyvinyl chloride sheath cable, which aims at the current state of the art, and has the characteristics of reasonable structural design, sufficient melting and plasticizing of materials in the screw and good product quality.
The technical scheme adopted for solving the technical problems is as follows: the utility model provides a special screw rod of high-efficient polyvinyl chloride sheath cable extrusion, includes screw rod and main flight, and main flight sets up on the face of cylinder of screw rod along screw rod length direction, and main flight forms helicoidal groove and main spiral arris with the screw rod, its characterized in that: the screw is sequentially divided into a feeding section, a separating compression section, a metering section and a barrier section along the length direction from feeding to discharging, wherein the feeding section is a double-thread feeding section, a second spiral sheet parallel to the main spiral sheet is additionally arranged on the feeding section, the outer diameter of the second spiral sheet is consistent with that of the main spiral sheet, and the second spiral sheet divides the spiral groove on the feeding section into two spiral grooves with the same width; the separation type compression section is provided with a secondary spiral sheet which plays a role of shielding to separate solid plastic from molten plastic, the outer diameter of the secondary spiral sheet is smaller than that of the main spiral sheet, the main spiral pitch of the separation type compression section is larger than that of the feeding section, and the length-diameter ratio of the screw is 24:1-26:1.
As an improvement, the auxiliary spiral sheet is arranged at the middle section and the rear section of the separation type compression section, the auxiliary spiral sheet divides spiral grooves on the middle section and the rear section of the separation type compression section into molten state area spiral grooves and solid state area spiral grooves, molten plastic enters the molten state area beyond the outer diameter of the auxiliary spiral sheet, the width of the solid state area spiral grooves is gradually narrowed, the depth of the spiral grooves is gradually shallower, the width of the molten state area spiral grooves is gradually widened, and the depth of the spiral grooves is gradually deepened and then shallower and is leveled with the depth of the metering section spiral grooves.
Further, the main screw pitch of the separated compression section is 1.2-1.3 times of that of the feeding section, and the main screw pitch on the metering section is consistent with that of the feeding section.
Further, a plurality of longitudinal grooves are formed in the cylindrical surface of the screw rod of the barrier section at equal intervals, the longitudinal grooves are divided into two groups of feed grooves and discharge grooves, the two groups of longitudinal grooves are arranged at intervals, wherein the outlet of the feed grooves is closed in the axial direction, and the inlet of the discharge grooves is closed in the axial direction.
Still further, the outside diameter of the thread between the feed chute and the discharge chute is less than the screw diameter.
Further, the length of the feeding section is 40% -50% of the length of the separation type compression section.
Further, the length of the separation type compression section is 55-65% of the total length of the screw.
Finally, the aspect ratio of the screw 25:1, the diameter phi of the screw rod is 45-150 mm.
Compared with the prior art, the utility model has the advantages that: carry out reasonable design to the structure of screw rod, adopt 25:1 length-diameter ratio of the screw rod, so that the polyvinyl chloride cable material can be fully melted and plasticized in the screw rod; the feeding section is designed as a double-thread feeding section, a first spiral sheet parallel to the main spiral sheet is additionally arranged, one spiral groove is changed into two during feeding, and meanwhile, the propelling force is divided into two parts, so that the forward resistance is reduced; the separation type compression section is arranged, and the auxiliary spiral piece is arranged on the separation type compression section, so that a material is melted in a molten state in the screw, and a solution containing unmelted solid small particles is subjected to high shearing to be melted when flowing to the external diameter of the auxiliary spiral piece, thereby improving the melting rate; the barrier section is arranged, so that the materials are sheared when the solution containing unmelted solid small particles flows to the barrier section under the melting state in the screw, and the melting and mixing are more sufficient. The utility model has reasonable structural design, and can improve the sufficient shearing and melting of the polyvinyl chloride sheath cable plastic in the screw by changing the screw structure, so that the product yield is improved by 20-35% on the premise of sufficient plasticization, and meanwhile, the stability of continuous production quality is improved, and the product quality is improved.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present utility model.
Detailed Description
The utility model is described in further detail below with reference to the embodiments of the drawings.
As shown in fig. 1, the special screw for extruding the high-efficiency polyvinyl chloride sheath cable comprises a screw 1 and a main screw piece 2, wherein the main screw piece 2 is arranged on the cylindrical surface of the screw 1 along the length direction of the screw 1, the main screw piece 2 and the screw 1 form a screw groove and a main screw edge, the screw 1 is sequentially divided into a feeding section A, a separation type compression section B, a metering section C and a barrier section D along the length direction from feeding to discharging, the feeding section A is a double-thread feeding section, the length of the feeding section A is 40% -50% of the length of the separation type compression section B, and the length of the separation type compression section B is 55% -65% of the total length of the screw 1.
The feeding section A is additionally provided with a second spiral sheet 3 parallel to the main spiral sheet 2, the outer diameter of the second spiral sheet 3 is consistent with that of the main spiral sheet 2, and the second spiral sheet 3 divides the spiral groove on the feeding section A into two spiral grooves with the same width. The separation type compression section B is provided with a secondary spiral sheet 4 which plays a role of shielding to separate solid plastic from molten plastic, the outer diameter of the secondary spiral sheet 4 is smaller than that of the main spiral sheet 2, and the main spiral pitch of the separation type compression section B is 1.2-1.3 times that of the feeding section A, so that materials can smoothly pass through the separation type compression section B when reaching the separation type compression section B in the conveying process of the screw 1, and the service life of the screw 1 is ensured. The auxiliary spiral sheet 4 is arranged at the middle section and the rear section of the separation type compression section B, the spiral grooves on the middle section and the rear section of the separation type compression section B are divided into a molten state area spiral groove 4.2 and a solid state area spiral groove 4.1 by the auxiliary spiral sheet 4, molten plastic passes through the outer diameter of the auxiliary spiral sheet 4 and enters the molten state area, the width of the solid state area spiral groove 4.1 is gradually narrowed, the depth of the spiral groove is gradually shallower, the width of the molten state area spiral groove 4.2 is gradually widened, the depth of the spiral groove is gradually deepened and then shallower and the depth of the spiral groove of the metering section C is leveled, so that a polyvinyl chloride sheath cable material is subjected to high shearing and molten when the molten material containing unmelted solid small particles flows into the separation type compression section B in the molten state of the screw 1, and the melting rate is improved. The main screw pitch on the metering section C is consistent with that of the feeding section A. A plurality of longitudinal grooves 5 are formed in the cylindrical surface of the screw 1 of the barrier section D at equal intervals, the longitudinal grooves 5 are divided into two groups of feed grooves and discharge grooves, the two groups of longitudinal grooves 5 are arranged in a staggered mode, wherein an outlet of the feed grooves is closed in the axial direction, and an inlet of the discharge grooves is closed in the axial direction. The outer diameter of the thread between the feed chute and the discharge chute is smaller than the diameter of the screw rod. The PVC cable material is sheared when the solution containing unmelted solid small particles flows to the barrier section D in the molten state in the screw 1, and a large amount of mechanical energy is changed into heat energy to melt the unmelted solid small particles. Aspect ratio 25 of screw 1: 1, ensuring that the polyvinyl chloride sheath cable material can be fully melted and plasticized in the screw 1, and ensuring that the polyvinyl chloride sheath cable material with the too small length-diameter ratio can not be fully melted and plasticized in the screw 1, wherein the diameter of the screw 1 is designed to be phi 45-phi 150mm.
According to the embodiment, the structure of the screw 1 is changed to improve that the polyvinyl chloride sheath cable plastic can be sufficiently sheared and melted in the screw 1, the productivity is increased, the product yield is improved by 20% -35% under the condition that the total power of the extruder is unchanged, meanwhile, the stability of continuous production quality is improved, and the product quality is improved.
The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that it will be apparent to those skilled in the art that several modifications and variations can be made without departing from the technical principle of the present utility model, and these modifications and variations should also be regarded as the scope of the utility model.
Claims (8)
1. The utility model provides a special screw rod of high-efficient polyvinyl chloride sheath cable extrusion, includes screw rod and main flight, and main flight sets up on the face of cylinder of screw rod along screw rod length direction, and main flight forms helicoidal groove and main spiral arris with the screw rod, its characterized in that: the screw is sequentially divided into a feeding section, a separating compression section, a metering section and a barrier section along the length direction from feeding to discharging, wherein the feeding section is a double-thread feeding section, a second spiral sheet parallel to the main spiral sheet is additionally arranged on the feeding section, the outer diameter of the second spiral sheet is consistent with that of the main spiral sheet, and the second spiral sheet divides the spiral groove on the feeding section into two spiral grooves with the same width; the separation type compression section is provided with a secondary spiral sheet which plays a role of shielding to separate solid plastic from molten plastic, the outer diameter of the secondary spiral sheet is smaller than that of the main spiral sheet, the main spiral pitch of the separation type compression section is larger than that of the feeding section, and the length-diameter ratio of the screw is 24:1-26:1.
2. The high efficiency polyvinyl chloride sheathing cable extrusion special screw as in claim 1, wherein: the auxiliary spiral sheet is arranged at the middle section and the rear section of the separation type compression section, the auxiliary spiral sheet divides spiral grooves on the middle section and the rear section of the separation type compression section into molten area spiral grooves and solid area spiral grooves, molten plastic enters the molten area beyond the outer diameter of the auxiliary spiral sheet, the width of the solid area spiral grooves is gradually narrowed, the depth of the spiral grooves is gradually shallower, the width of the molten area spiral grooves is gradually widened, and the depth of the spiral grooves is gradually deepened and then shallower and is leveled with the depth of the metering section spiral grooves.
3. The high efficiency polyvinyl chloride sheathing cable extrusion special screw as in claim 1, wherein: the main screw pitch of the separated compression section is 1.2-1.3 times of that of the feeding section, and the main screw pitch on the metering section is consistent with that of the feeding section.
4. The high efficiency polyvinyl chloride sheathing cable extrusion special screw as in claim 1, wherein: a plurality of longitudinal grooves are formed in the cylindrical surface of the screw rod of the barrier section at equal intervals, the longitudinal grooves are divided into two groups of feed grooves and discharge grooves, the two groups of longitudinal grooves are alternately arranged, an outlet of the feed grooves is closed in the axial direction, and an inlet of the discharge grooves is closed in the axial direction.
5. The special screw for extruding a high-efficiency polyvinyl chloride sheath cable according to claim 4, wherein: the outer diameter of the thread between the feed chute and the discharge chute is smaller than the diameter of the screw rod.
6. The high efficiency polyvinyl chloride sheath cable extrusion special screw as recited in any one of claims 1 to 5, wherein: the length of the feeding section is 40% -50% of the length of the separation type compression section.
7. The high efficiency polyvinyl chloride sheathing cable extrusion special screw as defined in claim 6, wherein: the length of the separation type compression section is 55-65% of the total length of the screw.
8. The high efficiency polyvinyl chloride sheath cable extrusion special screw as recited in any one of claims 1 to 5, wherein: aspect ratio of the screw 25:1, the diameter phi of the screw rod is 45-150 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322045961.1U CN220946597U (en) | 2023-08-01 | 2023-08-01 | Special screw rod of high-efficient polyvinyl chloride sheath cable extrusion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322045961.1U CN220946597U (en) | 2023-08-01 | 2023-08-01 | Special screw rod of high-efficient polyvinyl chloride sheath cable extrusion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220946597U true CN220946597U (en) | 2024-05-14 |
Family
ID=91006775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322045961.1U Active CN220946597U (en) | 2023-08-01 | 2023-08-01 | Special screw rod of high-efficient polyvinyl chloride sheath cable extrusion |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220946597U (en) |
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2023
- 2023-08-01 CN CN202322045961.1U patent/CN220946597U/en active Active
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