CN216732939U - Special screw rod of high-efficient polyethylene pipe extruder - Google Patents
Special screw rod of high-efficient polyethylene pipe extruder Download PDFInfo
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- CN216732939U CN216732939U CN202123125876.3U CN202123125876U CN216732939U CN 216732939 U CN216732939 U CN 216732939U CN 202123125876 U CN202123125876 U CN 202123125876U CN 216732939 U CN216732939 U CN 216732939U
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Abstract
The utility model relates to a special screw rod of high-efficient polyethylene pipe extruder, including the screw rod, its characterized in that: the screw is sequentially divided into a feeding section, a separation type compression section, a metering section, a barrier section and a mixing section along the length direction from feeding to discharging, a main spiral sheet is arranged on the screw cylindrical surfaces of the feeding section, the separation type compression section and the metering section along the length direction, a spiral groove and a main spiral edge are formed between the main spiral sheet and the screw, an auxiliary spiral sheet playing a barrier role is further arranged on the separation type compression section, the outer diameter of the auxiliary spiral sheet is smaller than that of the main spiral sheet, two barriers arranged at intervals are arranged on the barrier section, the main spiral edge lead and the auxiliary spiral edge lead of the separation type compression section are both larger than that of the feeding section, the main spiral edge lead and the auxiliary spiral edge lead of the separation type compression section are both 1.4-1.7 times of the main spiral edge lead of the feeding section, and the length-diameter ratio of the screw is 40: 1-42: 1. The screw improves the feeding amount and increases the plasticizing capacity.
Description
Technical Field
The utility model relates to a belong to macromolecular material processing machinery technical field, relate to a screw rod structure of extruder, especially relate to a special screw rod of high-efficient polyethylene pipe extruder.
Background
The extruder is used for fully mixing and extruding various particle 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.
A high-efficiency polyethylene pipe extruder is characterized in that Polyethylene (PE) plastics enter a containing cavity between a screw and a machine barrel through a feed opening of the extruder, thrust perpendicular to an inclined edge surface is generated on the plastics through the inclined edge surface rotated by the screw, the plastics are pushed forwards, in the pushing process, due to friction between the plastics and the screw, between the plastics and the machine barrel and friction between particles, the machine barrel is heated to be gradually melted, the melted plastics are extruded through a die, and qualified products are produced through a sizing sleeve and a vacuum cooling box. The screw of the existing standard extruder is easy to have overlarge mechanical energy at the beginning of a separation compression section, so that raw materials cannot pass through the screw smoothly; and the plasticizing is incomplete, the surface of the pipe is uneven, crystal points exist, the product quality and the productivity are reduced, and the competitive advantage is lost.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a special screw rod of high-efficient polyethylene pipe extruder is provided to above-mentioned prior art, have that structural design is reasonable, the shearing melting is abundant, product quality is good, high yield's characteristics.
The utility model provides a technical scheme that above-mentioned technical problem adopted does: the utility model provides a special screw rod of high-efficient polyethylene pipe extruder, includes the screw rod, its characterized in that: the screw is sequentially divided into a feeding section, a separation type compression section, a metering section, a barrier section and a mixing section along the length direction from feeding to discharging, a main spiral sheet is arranged on the screw cylindrical surfaces of the feeding section, the separation type compression section and the metering section along the length direction, a spiral groove and a main spiral edge are formed between the main spiral sheet and the screw, a secondary spiral sheet which has the barrier function and separates solid plastic and molten plastic is further arranged on the separation type compression section, the outer diameter of the secondary spiral sheet is smaller than that of the main spiral sheet, two barriers which are arranged at intervals are arranged on the barrier section, the main spiral edge lead and the secondary spiral edge lead of the separation type compression section are both larger than that of the main spiral edge lead of the feeding section, the main spiral edge lead and the secondary spiral edge lead of the separation type compression section are both 1.4-1.7 times of that of the main spiral edge lead of the feeding section, and the length-diameter ratio of the screw is 40: 1-42: 1.
As an improvement, the screw groove depths of the feeding sections are the same, the screw groove depths of the separated compression sections are gradually reduced to the metering sections, and the screw groove depths of the metering sections are the same.
As an improvement, the auxiliary spiral piece divides the spiral groove on the separated compression section into a molten state area spiral groove and a solid state area spiral groove, molten plastic enters the molten state area through the outer diameter of the auxiliary spiral piece, the width of the solid state area spiral groove is gradually narrowed, the depth of the solid state area spiral groove is gradually reduced, the width of the molten state area spiral groove is gradually widened, the depth of the molten state area spiral groove is gradually deepened and then reduced, and finally the molten state area spiral groove is flush with the depth of the spiral groove of the metering section.
And then, improving, wherein each barrier of the barrier section is provided with a plurality of longitudinal grooves on the cylindrical surface of the screw at equal intervals, the longitudinal grooves are divided into two groups of feeding grooves and discharging grooves, the two groups of longitudinal grooves are arranged at intervals, the outlets of the feeding grooves are closed in the axial direction, and the inlets of the discharging grooves are closed in the axial direction.
Preferably, the external diameter of the thread between the feed chute and the discharge chute is smaller than the diameter of the screw.
Furthermore, one row or a plurality of rows of pins are arranged on the cylindrical surface of the screw rod of the mixing section.
Preferably, the pins are cylindrical or square pins in 5-6 rows.
Preferably, the length of the separate type compression section is 30 to 38% of the total length of the screw.
Preferably, the length-diameter ratio of the screw is 42:1, the length-diameter ratio of the feeding section is 13:1, the length-diameter ratio of the separated compression section is 13:1, the length-diameter ratio of the metering section is 5.5:1, the length-diameter ratio of the barrier section is 6: 1, the length-diameter ratio of the mixing section is 4.5: 1.
compared with the prior art, the utility model has the advantages of: the structure of the screw is reasonably designed, the compression section is designed into a separation type compression section, and an auxiliary thread playing a role of a barrier is additionally arranged on the separation type compression section, so that the polyethylene plastic is molten in the screw in a molten state, and a solution containing small particles of unmelted solid flows to the separation type compression section to be subjected to high shearing and molten, and the melting rate is improved; the main screw ridge lead and the auxiliary screw ridge lead of the separated compression section are both larger than the main screw ridge lead of the feeding section, so that excessive mechanical energy cannot be generated in the separated compression section, and the smooth passing of raw materials is ensured; in addition, the screw increases the size of the main screw ridge lead and the auxiliary screw ridge lead so as to improve the feeding amount. In addition, the barrier section and the mixing section are arranged, so that when the molten material flows through the mixing section, shearing heating is generated, the non-molten material is molten, and meanwhile, the two barriers arranged at intervals are arranged on the barrier section, so that the plasticizing capacity can be increased, and the product plasticizing is prevented from being reduced when the yield is increased.
Drawings
Fig. 1 is a schematic structural view of a screw rod in 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 fig. 1, the screw dedicated for the high-speed polyethylene pipe extruder in this embodiment includes a screw 1, the screw 1 is sequentially divided into a feeding section a, a separation type compression section B, a metering section C, a barrier section D and a mixing section E along a length direction from feeding to discharging, helical fins are arranged on screw cylindrical surfaces of the feeding section a, the separation type compression section B and the metering section C along the length direction, and a helical groove 2a and a main helical rib 2B are formed between the helical fins and the screw 1; thus, the feeding section A ensures stable and non-heating feeding and uniform feeding, and the separated compression section B ensures that the raw materials can be fully sheared and stably extruded; the mixing section E is for sufficiently mixing the raw materials, further performing a plasticizing effect, and ensuring stable extrusion. In the embodiment, the bottom diameter of the feeding section A is 12-20% deeper than that of the existing screw, so that the feeding amount is increased; the bottom diameter of the metering section C is deepened by 8% -15% compared with that of the existing screw rod, so that the resistance is reduced, and the discharge amount is increased.
Wherein the depth of the screw grooves 2a of the feeding section A is the same, the depth of the screw grooves 2a of the compression section B is gradually reduced to the metering section C, and the depth of the screw grooves 2a of the metering section C is the same; an auxiliary spiral sheet 3 which has the function of a barrier and separates solid plastic from molten plastic is arranged on the separated compression section B, and the outer diameter of the auxiliary spiral sheet 3 is smaller than that of the main spiral sheet; the auxiliary spiral sheet 3 divides the spiral groove 2a on the separated compression section B into a molten zone spiral groove 3a and a solid zone spiral groove 3B, molten plastic enters the molten zone beyond the outer diameter of the auxiliary spiral sheet 3, the width of the solid zone spiral groove 3B is gradually narrowed, the depth of the solid zone spiral groove 3B is gradually reduced, the width of the molten zone spiral groove 3a is gradually widened, the depth of the molten zone spiral groove 3a is gradually reduced and then reduced, and finally the depth of the molten zone spiral groove 3a is leveled with the depth of the spiral groove 2B of the metering section C. Thus, when polyethylene plastic is in a molten state in the screw 1, a solution containing small particles of unmelted solid flows to the separation type compression section B and is melted by high shearing of the auxiliary spiral sheet 3, and the melting rate is improved; meanwhile, in the conveying process of the screw rod 1, materials can smoothly pass through the separation type compression section B when reaching the separation type compression section B, the blockage is not easy to occur, and the service life of the screw rod 1 is ensured.
In the embodiment, the main screw ridge lead and the auxiliary screw ridge lead of the separated compression section B are both larger than the main screw ridge lead of the feeding section A, and the main screw ridge lead and the auxiliary screw ridge lead of the separated compression section B are both 1.4-1.7 times of the main screw ridge lead of the feeding section A, so that excessive mechanical energy cannot be generated at the separated compression section B, the problem that raw materials cannot pass smoothly is avoided, and the productivity is improved; in addition, two barriers 5 which are arranged at intervals are arranged on the barrier section D, so that the plasticizing capacity can be increased, and the plasticizing decline of products can be prevented when the yield is increased.
Every protective screen 5 of protective screen section D corresponds and has seted up a plurality of longitudinal grooves on the screw rod face of cylinder at the equidistance, and longitudinal groove divide into feed chute and blown down tank two groups, and two longitudinal grooves of group set up at intervals, and wherein the export of feed chute is confined in the axis direction, and the entry of blown down tank is confined in the axis direction, and the external diameter of screw thread between feed chute and the blown down tank is less than screw rod 1 diameter. The utility model discloses the material of well measurement section is flowed in through less external diameter of thread by the feed chute and is got into the blown down tank, makes polyethylene plastics under 1 the inside molten state of screw rod, and the dissolved material that contains not fused solid tiny particle flows and receives shearing action when barrier section D, and a large amount of mechanical energy become heat energy, makes not fused solid tiny particle melting, mix to fully cut the raw materials of measurement section C through barrier section D, and further plastify and make the goods surface do not have brilliant point, and glossiness is good.
One or more rows of pins 4 are arranged on the cylindrical surface of the screw of the mixing section E, the pins 4 can be cylindrical or square pins, in the embodiment, the pins 4 are 6 rows and are arranged on the screw 1 at equal intervals. When the molten material flows through the mixing section E, shearing heating is generated, the unmelted material can be plasticized, and the gas in the molten material is changed into small and uniform material through shearing mixing.
The length of the separation type compression section B accounts for 30 to 38 percent of the total length of the screw 1. In this example, the length-diameter ratio of the screw 1 was 42:1, the length-diameter ratio of the feeding section A is 13:1, the length-diameter ratio of the separation type compression section B is 13:1, the length-diameter ratio of the metering section C is 5.5:1, the length-diameter ratio of the barrier section D is 6: 1, the length-diameter ratio of the mixing section E is 4.5: 1.
in practical use, the feeding section A, the separated compression section B and the metering section C in the screw have increased raw material discharge amount compared with the existing screw, the screw in the embodiment is suitable for a motor with 220KW rotating speed of 340 r/min and constant amount of 800Kg/h, and simultaneously ensures that the surface of a product has no crystal points, the glossiness is good, the thickness is uniform, and the product quality is improved.
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 embellishments can be made without departing from the technical principle of the present invention, and these improvements and embellishments should also be regarded as the protection scope of the present invention.
Claims (9)
1. The utility model provides a special screw rod of high-efficient polyethylene pipe extruder, includes the screw rod, its characterized in that: the screw is sequentially divided into a feeding section, a separation type compression section, a metering section, a barrier section and a mixing section along the length direction from feeding to discharging, a main spiral sheet is arranged on the screw cylindrical surfaces of the feeding section, the separation type compression section and the metering section along the length direction, a spiral groove and a main spiral edge are formed between the main spiral sheet and the screw, a secondary spiral sheet which has the barrier function and separates solid plastic and molten plastic is further arranged on the separation type compression section, the outer diameter of the secondary spiral sheet is smaller than that of the main spiral sheet, two barriers which are arranged at intervals are arranged on the barrier section, the main spiral edge lead and the secondary spiral edge lead of the separation type compression section are both larger than that of the main spiral edge lead of the feeding section, the main spiral edge lead and the secondary spiral edge lead of the separation type compression section are both 1.4-1.7 times of that of the main spiral edge lead of the feeding section, and the length-diameter ratio of the screw is 40: 1-42: 1.
2. The special screw for the high efficiency polyethylene pipe extruder as claimed in claim 1, wherein: the screw grooves of the feeding section are the same in depth, the screw grooves of the separated compression section are gradually shallower to the metering section, and the screw grooves of the metering section are the same in depth.
3. The special screw for the high efficiency polyethylene pipe extruder as claimed in claim 1, wherein: the auxiliary helical blade divides the helical groove on the separated compression section into a molten state area helical groove and a solid state area helical groove, molten plastic enters the molten state area after crossing the outer diameter of the auxiliary helical blade, the width of the solid state area helical groove is gradually narrowed, the depth of the solid state area helical groove is gradually reduced, the width of the molten state area helical groove is gradually widened, and the depth of the molten state area helical groove is gradually deepened, then is reduced and finally is connected with the depth of the helical groove of the metering section.
4. The special screw for the high efficiency polyethylene pipe extruder as claimed in claim 1, wherein: each barrier of the barrier section is provided with a plurality of longitudinal grooves on the cylindrical surface of the screw rod at equal intervals, the longitudinal grooves are divided into two groups of feeding grooves and discharging grooves, the two groups of longitudinal grooves are arranged at intervals, outlets of the feeding grooves are closed in the axis direction, and inlets of the discharging grooves are closed in the axis direction.
5. The special screw for the high efficiency polyethylene pipe extruder as claimed in claim 4, wherein: and the outer diameter of the thread between the feed chute and the discharge chute is smaller than the diameter of the screw.
6. The special screw for the high efficiency polyethylene pipe extruder 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 special screw for the high efficiency polyethylene pipe extruder as claimed in claim 6, wherein: the pins are cylindrical or square pins with 5-6 rows.
8. The special screw for the high-efficiency polyethylene pipe extruder as claimed in any one of claims 1 to 7, wherein: the length of the separated compression section accounts for 30-38% of the total length of the screw.
9. The special screw for the high-efficiency polyethylene pipe extruder as claimed in any one of claims 1 to 7, wherein: the length-diameter ratio of the screw is 42:1, the length-diameter ratio of the feeding section is 13:1, the length-diameter ratio of the separated compression section is 13:1, the length-diameter ratio of the metering section is 5.5:1, the length-diameter ratio of the barrier section is 6: 1, the length-diameter ratio of the mixing section is 4.5: 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123125876.3U CN216732939U (en) | 2021-12-10 | 2021-12-10 | Special screw rod of high-efficient polyethylene pipe extruder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123125876.3U CN216732939U (en) | 2021-12-10 | 2021-12-10 | Special screw rod of high-efficient polyethylene pipe extruder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216732939U true CN216732939U (en) | 2022-06-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123125876.3U Active CN216732939U (en) | 2021-12-10 | 2021-12-10 | Special screw rod of high-efficient polyethylene pipe extruder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216732939U (en) |
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2021
- 2021-12-10 CN CN202123125876.3U patent/CN216732939U/en active Active
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