CN203427214U

CN203427214U - Plastic extrusion pelletizing machine set

Info

Publication number: CN203427214U
Application number: CN201320351620.0U
Authority: CN
Inventors: 陈宜勇
Original assignee: FIDELITY PLASTIC MACHINERY Co Ltd SHANTOU
Current assignee: FIDELITY PLASTIC MACHINERY Co Ltd SHANTOU
Priority date: 2013-06-19
Filing date: 2013-06-19
Publication date: 2014-02-12
Anticipated expiration: 2023-06-19

Abstract

The utility model discloses a plastic extrusion pelletizing machine set which is characterized by comprising a host extruder, a second extruder and a pelletizing device, wherein the host extruder comprises a host cylinder and a host driving device; two host screw rods which rotate in different directions are arranged in the host cylinder; threads of the two host screw rods are opposite in direction and are mutually meshed; the two host screw rods are both in transmission connection with the host driving device; a host inlet is formed in the front end of the host cylinder; a main mold head is connected with the rear end of the main cylinder; the second extruder comprises a second cylinder and a second driving device; a second screw rod is arranged inside the second cylinder; the second screw rod is in transmission connection with the second driving device; a second inlet through which materials extruded from the main mold head can be received is formed in the front end of the second cylinder; a second mold head is connected with the rear end of the second cylinder; the direction of the pelletizing device corresponds to that of the second mold head. Due to adoption of the plastic extrusion pelletizing machine set disclosed by the utility model, materials can be smoothly fed, recycled plastic can be sufficiently plasticized, and plastic grains with good properties can be produced.

Description

Plastic extruding pelletization unit

Technical field

The utility model relates to the machinery of making particle, is specifically related to plastic extruding pelletization unit.

Background technology

At present, in production, life process, produce a large amount of plastic refuses, after these plastic refuses are discarded in natural environment, cannot degrade, cause serious white pollution, welding.Recycling to plastic refuse, can reduce white pollution on the one hand, and protection of the environment, can economize on resources on the other hand, increases economic efficiency.The mode that plastic refuse is recycled, normally carries out extruding pelletization, the plastic grain that formation can be used by downstream industry to the plastic refuse reclaiming.

For recycled plastic being carried out to the plastic extruding pelletization unit of extruding pelletization, generally include extruder and prilling granulator; The plastics that reclaim are being carried out in the process of extruding pelletization, after generally plastic refuse being classified, be cut into small pieces, clean up and dried, join and in extruder, carry out mixing, plasticizing, the plastic melt forming is extruded from the die head of extruder, by prilling granulator, carry out granulation again, form plastic grain.Extruder in existing plastic extruding pelletization unit generally adopts single screw extrusion machine; because recycled plastic fritter weight is lighter and more open, thereby charging is smooth and easy not, and screw rod transmission difficulty is larger; affect plasticizing effect, the plastic grain performance making is not ideal enough.In addition, recycled plastic must first dry before in joining extruder, needs large stretch of place, and expend the plenty of time and dry operation, makes whole plastics recovery granulation process efficiency lower, and cost is higher.

Summary of the invention

Technical problem to be solved in the utility model is to provide a kind of plastic extruding pelletization unit, and the charging of this plastic extruding pelletization unit is smooth and easy and can fully to recycled plastic, plastify, and makes well behaved plastic grain.The technical scheme adopting is as follows:

A unit, is characterized in that comprising main extruder, the second extruder and prilling granulator; Main extruder comprises major ingredient cylinder and main drive, in major ingredient cylinder, be provided with the driving screw of two incorgruous rotations, two driving screw hand of spirals are contrary and intermeshing, and two driving screws are all in transmission connection with main drive, major ingredient cylinder front end is provided with main charging aperture, and major ingredient tube rear end is connected with main die head; The second extruder comprises the second barrel and the second drive unit, in the second barrel, be provided with second screw rod, the second screw rod and the second drive unit are in transmission connection, and the second barrel front end is provided with second charging aperture that can receive the material of being extruded by main die head, and the second barrel rear end is connected with the second die head; Prilling granulator is corresponding with the second die head position.

Above-mentioned main extruder is counter rotation twin screw extruder, and when the autonomous charging aperture of recycled plastic joins in major ingredient cylinder, two driving screws of incorgruous rotation can be involved in recycled plastic between two driving screws and backward by force to be carried, and charging and conveying are very smooth and easy; Main extruder plastifies recycled plastic subsequently, and the plastic melt of formation is extruded and joined in the second extruder through main die head; Above-mentioned the second extruder is single screw extrusion machine, and the plastic melt forming after main extruder plasticizing is done to further plasticizing, thereby realizes the abundant plasticizing to recycled plastic; The plastic melt that the second die head is extruded carries out granulation by prilling granulator.

In a kind of preferred version, between above-mentioned main die head and the second charging aperture, be provided with conveying pipeline, conveying pipeline front end is communicated with the discharging opening of main die head, conveying pipeline rear end is above the second charging aperture, like this, the plastic melt that main die head is extruded flows out from conveying pipeline rear end after by conveying pipeline, and the plastic melt of outflow is exposed in air after certain hour, enter again in the second charging aperture, when plastic melt is exposed in air, can further distribute contained moisture.

In preferred version, above-mentioned driving screw comprises feed zone, compression section, fluxing zone and a plurality of exhaust compression fluxing zone successively from A-P, and exhaust compression fluxing zone consists of the exhaust segment connecting successively from A-P, compression segment and plasticizing segment; On feed zone, the each several part thread groove degree of depth is consistent, on compression section, the thread groove degree of depth reduces gradually from A-P, on fluxing zone, the each several part thread groove degree of depth is consistent, and the thread groove degree of depth of compression section front end equates with feed zone, and the thread groove degree of depth of rear end, compression section equates with fluxing zone; In each exhaust compression fluxing zone, on exhaust segment, the each several part thread groove degree of depth is consistent, on compression segment, the thread groove degree of depth reduces gradually from A-P, on plasticizing segment, the each several part thread groove degree of depth is consistent, and the thread groove degree of depth of compression segment front end equates with exhaust segment, the thread groove degree of depth of compressing segment rear end with plastify segment and equate; The thread groove degree of depth of the exhaust segment in top exhaust compression fluxing zone is greater than fluxing zone, and the thread groove degree of depth of the exhaust segment in rear exhaust compression fluxing zone is greater than the plasticizing segment in adjacent previous exhaust compression fluxing zone; Described main charging aperture is corresponding with feed zone position; Position corresponding with each exhaust segment on major ingredient cylinder sidewall is provided with exhaust outlet; Driving screw front end is connected with major ingredient cylinder by axle sleeve, between driving screw front end and axle sleeve, has drainage gap.The plastic extruding pelletization unit with said structure is applicable to water containing plastic to carry out extruding pelletization, and the plastic refuse of recovery, after being cut into small pieces and cleaning up, can join in main extruder by autonomous charging aperture without drying.When plastics materials is transported to compression section, two driving screws are gradually by plastics materials compacting, and water contained in plastics materials is extruded out, and then the drainage gap of autonomous barrel front end is discharged; When plastics materials enters the exhaust segment after it from fluxing zone or plasticizing segment, because the thread groove degree of depth becomes large suddenly, in barrel, space increases suddenly at this place, aqueous vapor in plastics materials is discharged from exhaust outlet rapidly, now barrel internal pressure is less, and the plastics materials having melted can not overflow.Like this, by the cooperation of compression section and drainage gap, can discharge most of aqueous water contained in the plastic refuse of recovery; By the cooperation of fluxing zone and a plurality of exhaust compression fluxing zone, can repeatedly plastify and the process of exhaust, plastics materials is fully plastified, and eliminating aqueous vapor wherein.Preferably each driving screw is provided with two to five exhaust compression fluxing zones, and more preferably each driving screw is provided with three exhaust compression fluxing zones.

In a kind of concrete scheme, the equal along continuous straight runs setting of above-mentioned two driving screws and left and right are side by side; Main charging aperture is located at the feed zone top of driving screw; On major ingredient cylinder sidewall, be provided with left and right two row's exhaust outlets side by side, the exhaust outlet on the left side is identical and corresponding one by one with exhaust segment quantity set on the driving screw on the left side, the exhaust outlet on the right is identical and corresponding one by one with exhaust segment quantity set on the driving screw on the right, and each exhaust outlet is all located on the upper side wall of major ingredient cylinder.

Conventionally, be also provided with an interflow cylinder between major ingredient tube rear end and main die head, interflow cylinder has a diversion cavity, the open communication of diversion cavity front end and major ingredient tube rear end, and diversion cavity rear end is communicated with the material inlet of main die head.In addition, between interflow cylinder and main die head, be conventionally also provided with net exchanging device, before plastic melt enters main die head, plastic melt filtered.

In preferred version, above-mentioned the second die head comprises a material discharging mould, and the melt material that material discharging mould is arranged on the second barrel rear end exports above, and material discharging mould is provided with discharge opening; Described prilling granulator comprises water ring body, water inlet pipe, rewinding bucket, locating shaft, cutting knife, cutoff knife rack and cutter driving motor; Water ring body is located on material discharging mould outside; Water ring body is connected with rewinding bucket, and water ring body has annular housing, and water inlet pipe is communicated with the annular housing of water ring body, and water ring body is provided with water jet, and water jet is communicated with the annular housing of water ring body with the cavity of rewinding bucket; The melt material outlet of the second barrel rear end is communicated with the cavity of rewinding bucket by discharge opening; Locating shaft is fixed in rewinding bucket, and cutoff knife rack is rotatably arranged on locating shaft, and cutting knife is arranged on cutoff knife rack, in the cavity of cutting knife in rewinding bucket and corresponding with discharge opening position; The power output shaft of cutoff knife rack and cutter driving motor is in transmission connection; Rewinding bottom of the barrel is provided with discharging opening.While carrying out granulation, cooling water enters the annular housing of water ring body from water inlet pipe, and sprays into rewinding bucket from water jet, in rewinding bucket, forms cooling water flow; The discharge opening of the plastic melt that extruder is extruded from material discharging mould passes through, when the discharge opening of plastic melt from material discharging mould extruded, the cutting knife rotating under cutter driving Motor Drive cuts into plastic grain by plastic melt, under centrifugal action, the plastic grain cutting down is thrown toward rewinding bucket inwall, by cooling water flow, carries out cooling, setting; Subsequently, plastic grain is discharged from discharging opening with cooling water flow.

On above-mentioned material discharging mould, be typically provided with a plurality of discharge openings, these discharge openings are distributed in take on the circle that locating shaft center is the center of circle or on a plurality of concentric circles; Further, a plurality of discharge openings on each circle were upwards uniformly distributed in the week of this circle.

Preferred above-mentioned water ring body is annular, water inlet pipe rear portion has a straightway, and the centerline of this straightway is in the tangential direction of water ring body, like this, tangential direction from water inlet pipe current out along water ring body enters the annular housing of water ring body, and the suffered resistance of current is less.

Above-mentioned locating shaft can be fixedly connected with material discharging mould, also can be fixedly connected with rewinding bucket.

In a kind of concrete scheme, above-mentioned cutoff knife rack includes positioning sleeve, and positioning sleeve is socketed on locating shaft and can rotates with respect to locating shaft, thereby cutoff knife rack is rotatably arranged on locating shaft.In another kind of concrete scheme, above-mentioned cutoff knife rack is connected with locating shaft by bearing, thereby cutoff knife rack is rotatably arranged on locating shaft.

Above-mentioned liquid-ring type pellet device can be provided with one or more cutting knifes, and the blade of cutting knife is conventionally along the radially extension of locating shaft; In the situation that being provided with a plurality of cutting knife, these a plurality of cutting knifes are upwards uniform in the week of locating shaft.

Above-mentioned cutter driving motor can be fixedly mounted on rewinding bucket.Also above-mentioned cutter driving motor and rewinding bucket all can be fixedly mounted in a frame.

In preferred version, on the power output shaft of above-mentioned cutter driving motor, be coaxially installed with a splined shaft, cutoff knife rack is provided with adapter sleeve, adapter sleeve has the splined hole matching with described splined shaft, adapter sleeve is socketed on splined shaft, on the one hand, splined can be transmitted larger load, the power of cutter driving motor power output shaft can be passed to cutoff knife rack reliably, on the other hand, adapter sleeve can, along the moving axially of splined shaft, make the handling between cutoff knife rack and the power output shaft of cutter driving motor convenient.In addition, cutoff knife rack also can be in transmission connection by the power output shaft of the transmission mechanisms such as tape handler, chain-drive mechanism, gear train or shaft coupling and cutter driving motor.

In preferred version, above-mentioned rewinding bucket is cylindric, and the center line of rewinding bucket overlaps with the center line of locating shaft, water jet is close to rewinding bucket inwall, and become an angle (the more preferably angle of 15-45 °) that is less than 90 ° between water jet and plane perpendicular to rewinding bucket center line, like this, water jet is sprayed water towards rewinding bucket inwall, and forms spirality current layer at the inwall of rewinding bucket.

Preferred above-mentioned plastic extruding pelletization unit also comprises chute feeder, vibratory sieve, water leg, water pump and drinking-water pipe; chute feeder front end is located at discharging opening below; vibratory sieve top is located in chute feeder rear end; water leg is located at vibratory sieve below; drinking-water pipe front end (being one end of drinking-water pipe water inlet) is in water leg; drinking-water pipe rear end (being one end of drinking-water pipe water outlet) connects the water inlet of water pump; water inlet pipe front end (being one end of water inlet pipe water inlet) connects the delivery port of water pump, and water inlet pipe rear end (being one end of water inlet pipe water outlet) connects water ring body.Plastic grain, along with cooling water is discharged from discharging opening, flows in chute feeder, then is delivered on vibratory sieve by chute feeder; Vibratory sieve is separated with cooling water by plastic grain, plastic grain is stayed on the screen cloth of vibratory sieve and is sent to next procedure, cooling water under Action of Gravity Field by screen cloth and fall into water leg, after water pump extracts, enter water inlet pipe, can realize recycling of cooling water, using water wisely like this.

Preferred above-mentioned vibratory sieve rear is also provided with centrifugal feeder and storage vat, and the plastic grain of centrifugal feeder self-excited oscillation in the future sieve is delivered to storage vat, by storage vat, stores plastic grain.

In the utility model, main extruder is counter rotation twin screw extruder, when the autonomous charging aperture of recycled plastic joins in major ingredient cylinder, two driving screws of incorgruous rotation can be involved in recycled plastic between two driving screws and backward by force to be carried, and charging and conveying are very smooth and easy; Main extruder plastifies recycled plastic subsequently; the plastic melt forming is extruded and is joined in the second extruder through main die head; by the second extruder, the plastic melt forming is done to further plasticizing after main extruder plasticizing; thereby realize the abundant plasticizing to recycled plastic; by prilling granulator, carry out granulation again; therefore, plastic extruding pelletization unit of the present utility model charging is smooth and easy and can fully to recycled plastic, plastify, and makes well behaved plastic grain.

Accompanying drawing explanation

Fig. 1 is the structural representation of the utility model preferred embodiment;

Fig. 2 is the structural representation of main extruder in Fig. 1;

Fig. 3 is the top view of Fig. 2;

Fig. 4 is the structural representation of the driving screw on the left side in main extruder shown in Fig. 3;

Fig. 5 is the structural representation of driving screw on the right in main extruder shown in Fig. 3;

Fig. 6 is the structural representation of the front portion of main extruder shown in Fig. 3;

Fig. 7 is the structural representation of prilling granulator in Fig. 1;

Fig. 8 is the exploded view of prilling granulator shown in Fig. 7;

Fig. 9 is the right view of water ring body in Fig. 7;

Figure 10 is the right view of material discharging mould in Fig. 7.

The specific embodiment

As shown in Figure 1, this plastic extruding pelletization unit comprises feeding machine 1, main extruder 2, the second extruder 3, prilling granulator 4, chute feeder 5, vibratory sieve 6, centrifugal feeder 7 and storage vat 8.Main extruder 2 comprises major ingredient cylinder 21 and main drive 22, in major ingredient cylinder 21, be provided with the driving screw 23 of two incorgruous rotations, two driving screw 23 hand of spirals are contrary and intermeshing, two driving screws 23 are all in transmission connection with main drive 22, major ingredient cylinder 21 front ends are provided with main charging aperture 24, and major ingredient cylinder 21 rear ends are connected with main die head 25.The second extruder 3 comprises the second barrel 31 and the second drive unit 32, in the second barrel 32, be provided with second screw rod, the second screw rod and the second drive unit 32 are in transmission connection, the second barrel 31 front ends are provided with second charging aperture 33, the second barrel 31 rear ends that can receive the material of being extruded by main die head 25 and are connected with the second die head.Prilling granulator 4 is corresponding with the second die head position.

In the present embodiment, feeding machine 1, main drive 22, the second extruder 3, chute feeder 5, vibratory sieve 6, centrifugal feeder 7 and storage vat 8 all can adopt existing equipment.

Between main die head 25 and the second charging aperture 33, be provided with conveying pipeline 9, conveying pipeline 9 front ends are communicated with the discharging opening of main die head 25, and conveying pipeline 9 rear end are above the second charging aperture 33.

With reference to figure 2-Fig. 5, driving screw 23 comprises that from A-P feed zone 231, compression section 232, fluxing zone 233 and three exhaust compression fluxing zone 234(are followed successively by exhaust compression fluxing zone 234-1,234-2 and 234-3 successively), exhaust compression fluxing zone 234 consists of the exhaust segment 2341 connecting successively from A-P, compression segment 2342 and plasticizing segment 2343; On feed zone 231, the degree of depth of each several part thread groove 235 is consistent, on compression section 232, the degree of depth of thread groove 235 reduces gradually from A-P, on fluxing zone 233, the degree of depth of each several part thread groove 235 is consistent, and the thread groove degree of depth of compression section 232 front ends equates with feed zone 231, the thread groove degree of depth of 232 rear ends, compression section equates with fluxing zone 233; In each exhaust compression fluxing zone 234, on exhaust segment 2341, the degree of depth of each several part thread groove 235 is consistent, on compression segment 2342, the degree of depth of thread groove 235 reduces gradually from A-P, on plasticizing segment 2343, the degree of depth of each several part thread groove 235 is consistent, and the thread groove degree of depth of compression segment 2342 front ends equates with exhaust segment 2341, the thread groove degree of depth of compressing segment 2342 rear ends with plastify segment 2343 and equate; The thread groove degree of depth of the exhaust segment 2341 in top exhaust compression fluxing zone 234-1 is greater than fluxing zone 233, and the thread groove degree of depth of the exhaust segment 2341 in rear exhaust compression fluxing zone 234 is greater than the plasticizing segment 2343 in adjacent previous exhaust compression fluxing zone 234; Main charging aperture 24 is corresponding with feed zone 231 positions; Position corresponding with each exhaust segment 2341 on major ingredient cylinder 21 sidewalls is provided with exhaust outlet 27.With reference to figure 6, driving screw 23 front ends are connected with major ingredient cylinder 21 by axle sleeve 28, between driving screw 23 front ends and axle sleeve 28, have drainage gap 29.

With reference to figure 3, in the present embodiment, two equal along continuous straight runs settings of driving screw 23 and left and right are side by side; Main charging aperture 24 is located at feed zone 231 tops of driving screw 23; On major ingredient cylinder 21 sidewalls, be provided with the left and right every row of two row exhaust outlet 27(side by side and have three exhaust outlets 27), the exhaust outlet 27 on the left side is corresponding one by one with exhaust segment 2341 set on the driving screw 23 on the left side, the exhaust outlet 27 on the right is corresponding one by one with exhaust segment 2341 set on the driving screw 23 on the right, and each exhaust outlet 27 is all located on the upper side wall of major ingredient cylinder 21.Between major ingredient cylinder 21 rear ends and main die head 25, be also provided with interflow cylinder 210, interflow cylinder 210 has a diversion cavity, the open communication of diversion cavity front end and major ingredient cylinder 21 rear ends, and diversion cavity rear end is communicated with the material inlet of main die head 25.Between interflow cylinder 210 and main die head 25, be also provided with net exchanging device 211, before plastic melt enters main die head 25, plastic melt filtered.

As shown in Figure 7 and Figure 8, the second die head comprises a material discharging mould 34, and material discharging mould 34 is arranged in the melt material outlet 35 of the second barrel 31 rear ends, and material discharging mould 34 is provided with discharge opening 36; Prilling granulator 4 comprises water ring body 42, water inlet pipe 43, rewinding bucket 44, locating shaft 45, cutting knife 46, cutoff knife rack 47 and cutter driving motor 48.

Water ring body 42 is located on material discharging mould 34 outsides; Water ring body 42 is connected with rewinding bucket 44, and water ring body 42 has annular housing, and water inlet pipe 43 is communicated with the annular housing of water ring body 42, and water ring body 42 is provided with a plurality of water jets 49, and water jet 49 is communicated with the annular housing of water ring body 42 with the cavity of rewinding bucket 44.With reference to figure 9, in the present embodiment, water ring body 42 is annular, and water inlet pipe 43 rear portions have a straightway 410, and the centerline of this straightway 410 is in the tangential direction of water ring body 42.

The melt material outlet 35 of the second barrel rear end is communicated with the cavity of rewinding bucket 44 by discharge opening 36.With reference to Figure 10, in the present embodiment, material discharging mould 34 is provided with a plurality of discharge openings 36, and these discharge openings 36 are distributed in take on a plurality of concentric circles that locating shaft 45 centers are the center of circle, and a plurality of discharge openings 36 on each circle were upwards uniformly distributed in the week of this circle.

Locating shaft 45 is fixed in rewinding bucket 44, and in the present embodiment, locating shaft 45 is fixedly connected with material discharging mould 34.

Cutoff knife rack 47 is rotatably arranged on locating shaft 45 that (cutoff knife rack 47 is connected with locating shaft 45 by bearing 413, thereby cutoff knife rack 47 is rotatably arranged on locating shaft 45), cutting knife 46 is arranged on cutoff knife rack 47 (in the present embodiment, liquid-ring type pellet device is provided with a plurality of cutting knifes 47, the blade of cutting knife 47 is along the radially extension of locating shaft 45, these a plurality of cutting knifes 47 are upwards uniform in the week of locating shaft 45), in the cavity of cutting knife 47 in rewinding bucket 44 and corresponding with discharge opening 36 positions.

Cutoff knife rack 47 is in transmission connection with the power output shaft 414 of cutter driving motor 48, in the present embodiment, cutter driving motor 48 is fixedly mounted on rewinding bucket 44, on the power output shaft 414 of cutter driving motor 48, be coaxially installed with a splined shaft 415, cutoff knife rack 47 is provided with adapter sleeve 416, adapter sleeve 416 has the splined hole 418 matching with described splined shaft 415, and adapter sleeve 416 is socketed on splined shaft 415.

In the present embodiment, rewinding bucket 44 is cylindric, and the center line of rewinding bucket 44 overlaps with the center line of locating shaft 45, water jet 49 is close to the inwall of rewinding bucket 44, and becomes an angle (the more preferably angle of 15-45 °) that is less than 90 ° between water jet 49 and plane perpendicular to rewinding bucket 44 center lines.

Rewinding bucket 44 bottoms are provided with discharging opening 417.

Chute feeder 5 front ends are located at discharging opening 417 belows, and vibratory sieve 6 tops are located in chute feeder 5 rear ends.

In addition; above-mentioned plastic extruding pelletization unit also can comprise water leg, water pump and drinking-water pipe; water leg is located at vibratory sieve 6 belows; drinking-water pipe front end (being one end of drinking-water pipe water inlet) is in water leg; drinking-water pipe rear end (being one end of drinking-water pipe water outlet) connects the water inlet of water pump; water inlet pipe 43 front ends (being one end of water inlet pipe water inlet) connect the delivery port of water pump, and water inlet pipe 43 rear ends (being one end of water inlet pipe 43 water outlets) connects water ring body 42.

Brief description is the operation principle of this plastic extruding pelletization unit once:

(1) after the plastic refuse of recovery is cleaned up, directly deliver on feeding machine 1, by feeding machine 1, recycled plastic is joined to main extruder 2 through main charging aperture 24;

(2) 2 pairs of recycled plastics of main extruder plastify, and the plastic melt of formation is extruded and joined in the second extruder 3 by conveying pipeline 9 through main die head 25, and detailed process is:

When plastics materials is transported to compression section 232, two driving screws 23 are gradually by plastics materials compacting, and most of water contained in plastics materials is extruded out, and then the drainage gap 29 of autonomous barrel 21 front ends is discharged; When plastics materials process fluxing zone 233 or plasticizing segment 2343, by main extruder 2, it is plastified; When plastics materials enters the exhaust segment 2341 after it from fluxing zone 233 or plasticizing segment 2343, because the degree of depth of thread groove 235 becomes large suddenly, the interior space of barrel 21 increases suddenly at this place, aqueous vapor in plastics materials is discharged from exhaust outlet 27 rapidly, now barrel 21 internal pressures are less, the plastics materials having melted can not overflow, and the process of this plasticizing and exhaust repeats repeatedly (four plasticizings of plastics materials experience in main extruder 2, three exhausts);

The plastic melt that main die head 25 is extruded, by after conveying pipeline 9, flows out from conveying pipeline 9 rear ends, and the plastic melt of outflow is exposed in air after certain hour, then enters in the second charging aperture 33;

The plastic melt that (3) second 3 pairs of extruders form after main extruder 2 plasticizings is done further plasticizing, and the plastic melt that the second die head is extruded carries out granulation by prilling granulator 4, and the detailed process of granulation is:

While carrying out granulation, cooling water enters the annular housing of water ring body 42 from water inlet pipe 43, and sprays into rewinding bucket 44(water jet 49 water sprays of the inwall towards rewinding bucket 44 from water jet 49), at the inwall of rewinding bucket 44, form spirality cooling water fluid layer; The discharge opening 36 of the plastic melt that the second extruder 3 is extruded from material discharging mould 34 passes through, when the discharge opening 36 of plastic melt from material discharging mould 34 extruded, under cutter driving motor 48 drives, the cutting knife 46 of rotation cuts into plastic grain by plastic melt, under centrifugal action, the plastic grain cutting down is thrown toward the inwall of rewinding bucket 44, by capable cooling, the setting of spirality cooling water fluid layer; Subsequently, plastic grain is discharged from discharging opening 417 with cooling water flow;

(4) plastic grain, along with cooling water is discharged from discharging opening 417, flows in chute feeder 5, then is delivered on vibratory sieve 6 by chute feeder 5; Vibratory sieve 6 is separated with cooling water by plastic grain, and plastic grain is stayed on the screen cloth of vibratory sieve 6 and is sent to centrifugal feeder 7, cooling water under Action of Gravity Field by screen cloth and fall into water leg, after water pump extracts, enter water inlet pipe 43;

(5) plastic grain of centrifugal feeder 7 sieves of self-excited oscillation in the future 6 is delivered to storage vat 8, by storage vat 8, stores plastic grain.

Claims

1. a plastic extruding pelletization unit, is characterized in that comprising main extruder, the second extruder and prilling granulator; Main extruder comprises major ingredient cylinder and main drive, in major ingredient cylinder, be provided with the driving screw of two incorgruous rotations, two driving screw hand of spirals are contrary and intermeshing, and two driving screws are all in transmission connection with main drive, major ingredient cylinder front end is provided with main charging aperture, and major ingredient tube rear end is connected with main die head; The second extruder comprises the second barrel and the second drive unit, in the second barrel, be provided with second screw rod, the second screw rod and the second drive unit are in transmission connection, and the second barrel front end is provided with second charging aperture that can receive the material of being extruded by main die head, and the second barrel rear end is connected with the second die head; Prilling granulator is corresponding with the second die head position.

2. plastic extruding pelletization unit according to claim 1, is characterized in that: between described main die head and the second charging aperture, be provided with conveying pipeline, conveying pipeline front end is communicated with the discharging opening of main die head, and conveying pipeline rear end is above the second charging aperture.

3. plastic extruding pelletization unit according to claim 1, it is characterized in that: described driving screw comprises feed zone, compression section, fluxing zone and a plurality of exhaust compression fluxing zone successively from A-P, and exhaust compression fluxing zone consists of the exhaust segment connecting successively from A-P, compression segment and plasticizing segment; On feed zone, the each several part thread groove degree of depth is consistent, on compression section, the thread groove degree of depth reduces gradually from A-P, on fluxing zone, the each several part thread groove degree of depth is consistent, and the thread groove degree of depth of compression section front end equates with feed zone, and the thread groove degree of depth of rear end, compression section equates with fluxing zone; In each exhaust compression fluxing zone, on exhaust segment, the each several part thread groove degree of depth is consistent, on compression segment, the thread groove degree of depth reduces gradually from A-P, on plasticizing segment, the each several part thread groove degree of depth is consistent, and the thread groove degree of depth of compression segment front end equates with exhaust segment, the thread groove degree of depth of compressing segment rear end with plastify segment and equate; The thread groove degree of depth of the exhaust segment in top exhaust compression fluxing zone is greater than fluxing zone, and the thread groove degree of depth of the exhaust segment in rear exhaust compression fluxing zone is greater than the plasticizing segment in adjacent previous exhaust compression fluxing zone; Described main charging aperture is corresponding with feed zone position; Position corresponding with each exhaust segment on major ingredient cylinder sidewall is provided with exhaust outlet; Driving screw front end is connected with major ingredient cylinder by axle sleeve, between driving screw front end and axle sleeve, has drainage gap.

4. plastic extruding pelletization unit according to claim 3, is characterized in that: the equal along continuous straight runs setting of described two driving screws and left and right are side by side; Main charging aperture is located at the feed zone top of driving screw; On major ingredient cylinder sidewall, be provided with left and right two row's exhaust outlets side by side, the exhaust outlet on the left side is identical and corresponding one by one with exhaust segment quantity set on the driving screw on the left side, the exhaust outlet on the right is identical and corresponding one by one with exhaust segment quantity set on the driving screw on the right, and each exhaust outlet is all located on the upper side wall of major ingredient cylinder.

5. according to the plastic extruding pelletization unit described in claim 1-4 any one, it is characterized in that: described the second die head comprises a material discharging mould, the melt material that material discharging mould is arranged on the second barrel rear end exports above, and material discharging mould is provided with discharge opening; Described prilling granulator comprises water ring body, water inlet pipe, rewinding bucket, locating shaft, cutting knife, cutoff knife rack and cutter driving motor; Water ring body is located on material discharging mould outside; Water ring body is connected with rewinding bucket, and water ring body has annular housing, and water inlet pipe is communicated with the annular housing of water ring body, and water ring body is provided with water jet, and water jet is communicated with the annular housing of water ring body with the cavity of rewinding bucket; The melt material outlet of the second barrel rear end is communicated with the cavity of rewinding bucket by discharge opening; Locating shaft is fixed in rewinding bucket, and cutoff knife rack is rotatably arranged on locating shaft, and cutting knife is arranged on cutoff knife rack, in the cavity of cutting knife in rewinding bucket and corresponding with discharge opening position; The power output shaft of cutoff knife rack and cutter driving motor is in transmission connection; Rewinding bottom of the barrel is provided with discharging opening.

6. plastic extruding pelletization unit according to claim 5, is characterized in that: described cutter driving motor is fixedly mounted on rewinding bucket.

7. plastic extruding pelletization unit according to claim 5; it is characterized in that: on the power output shaft of described cutter driving motor, be coaxially installed with a splined shaft; cutoff knife rack is provided with adapter sleeve; adapter sleeve has the splined hole matching with described splined shaft, and adapter sleeve is socketed on splined shaft.

8. plastic extruding pelletization unit according to claim 5; it is characterized in that: described rewinding bucket is cylindric; and the center line of rewinding bucket overlaps with the center line of locating shaft; water jet is close to rewinding bucket inwall, and becomes an angle that is less than 90 ° between water jet and plane perpendicular to rewinding bucket center line.