CN107685436A - A kind of ultra-high molecular weight polyethylene plasticized screw extruder - Google Patents

A kind of ultra-high molecular weight polyethylene plasticized screw extruder Download PDF

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Publication number
CN107685436A
CN107685436A CN201711067903.1A CN201711067903A CN107685436A CN 107685436 A CN107685436 A CN 107685436A CN 201711067903 A CN201711067903 A CN 201711067903A CN 107685436 A CN107685436 A CN 107685436A
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CN
China
Prior art keywords
screw rod
compression
screw
molecular weight
ultra
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Granted
Application number
CN201711067903.1A
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Chinese (zh)
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CN107685436B (en
Inventor
许梦艳
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Guangdong Zhiyue Electric Appliance Co.,Ltd.
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/252—Drive or actuation means; Transmission means; Screw supporting means
    • B29C48/2526—Direct drives or gear boxes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
    • B29C48/425—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders using three or more screws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
    • B29C48/435—Sub-screws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/59—Screws characterised by details of the thread, i.e. the shape of a single thread of the material-feeding screw
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/67—Screws having incorporated mixing devices not provided for in groups B29C48/52 - B29C48/66

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

One kind forces homogenizing adjustable speed screw extruder, including feeder, by force mixed portion and mixing compression unit, feeder to include the feed worm being rotatably provided in first order barrel；The mixing compression unit includes second level barrel, compression screw rod, drive rod；Compress screw rod to coordinate in the barrel of the second level, the compression screw rod tail is fixedly connected with drive rod；The portion mixed by force includes connection housing, batch mixing portion and melt batch mixing passage, and the batch mixing portion includes driving the batch mixing blade to rotate to spaced at least two batch mixings sub-portion and drive division, the drive division perpendicular to drive rod axis along melt batch mixing passage is circumferential.It is described to force homogenizing adjustable speed screw extruder, both compression screw rod is obtained relative to the respective separately adjustable rotating speed of feed worm, obtain melting charge again is forcing batch mixing to greatly improve melt uniformity into mixing compression unit, the plasticizing that cannot not have moltenly the raw material of particle more suitable for the big raw material components of viscosity.

Description

A kind of ultra-high molecular weight polyethylene plasticized screw extruder
Technical field
The present invention relates to the technical field of extruder, and in particular to a kind of ultra-high molecular weight polyethylene plasticized screw extrusion Machine.
Background technology
Ultra-high molecular weight polyethylene refers to stick linear structure polyethylene of the equal relative molecular mass more than 1.5 × 106.By It is high in relative molecular weight, plastify following difficult：
1）Screw rod is easily blocked, because viscosity is high, mobility extreme difference, and the raw material of High molecular weight polyethylene is powdery, modeling Change phase mutual friction coefficient is extremely low, and when being processed with the conventional plasticized screw rod of prior art, the High molecular weight polyethylene of powdery exists Middle generation " embracing screw rod " phenomenon is threadingly advanced, causes material to occur to block in machine barrel compression section and stagnates；
2）Raw material rheological property is poor, and common polythene melt is in viscous fluid shape, and in half during ultra-high molecular weight polyethylene melting Transparence, i.e., typical high glutinous bullet state, its viscosity are up to 1.0 × 109Pa s, melt flow rate (MFR)（MFR）（2.16kg）Almost It is zero, even if testing load is exacerbated into 21.6kg, also difficulty measures its MFR value.And the molecular weight of ultra-high molecular weight polyethylene Bigger, its melting viscosity is bigger, thus brings extreme difficulties to the shear forming processing such as plasticizing, extrusion, injection.
Because its viscosity is high, processing and forming is difficult, the production of the product of its non-continuous shapes for a long time substantially according to Pressured sintering process processed is processed with bar, sheet material, tubing, extremely inefficient, make the practical application of ultra-high molecular weight polyethylene by To limitation.
Ultra-high molecular weight polyethylene is typically tried every possible means modification, to improve its melt on the premise of basic performance is not changed Mobility.1. it is modified with flow ability modifying agent；Using the flow ability modifying agent of strength so that the molecule of ultra-high molecular weight polyethylene Winding arrangement is untied, intermolecular lubricity is retained, and thus can also be caused while polyethylene mobility is changed Material after plasticizing does not lose its original basic performance.2. liquid crystal polymer composite is modified, liquid crystal polymer can The simple mobility for improving ultra-high molecular weight polyethylene, both are combined together under high temperature action, are formed between the two faint Molecular force forms helical molecular structures, enhances molecule fluid ability.3. it is chemical crosslinking modified, add peroxide Or, coupling agent such as silane and siloxanes, the plasticity of ultra-high molecular weight polyethylene can be increased.However, it is still desirable to special Plasticizing machinery could complete the shaping of ultra-high molecular weight polyethylene.Northcentral University Liu Ya green grass or young crops CN101003174A discloses one kind Forming machine for extruding assistant high molecular material in supercritical fluid, to be plastified to ultra-high molecular weight polyethylene, it passes through in twin-screw Feeding section, compression section and the homogenizing zone of extruder are passed through supercritical carbon dioxide (SC-CO2) and it is refined into multiple streams Injected after beam, expand contact area, not only reduce the melting temperature of polymer, and reduce the viscous of polymer melt Degree.
Single-screw compulsory plastifies.
Due to the friction factor very little of ultra-high molecular weight polyethylene and barrel and screw rod, therefore, easily skid and form material plug, It is usually feeding section design axial groove that prior art, which solves, forces cooling and realizes superelevation using low compression ratio, deep screw channel The forced conveyance of molecular weight polyethylene, while increase is kneaded uniformity as much as possible.Beijing University of Chemical Technology what after quick CN2227016Y discloses a kind of UHMWPE Single Screw extruder, and feeding section machine barrel is independently of compression section and metering Section, can independently be cooled down, and feeding section barrel liner sets inner sleeve 11, and the inwall of inner sleeve 11 is provided with axial groove, groove along extrude direction by Gradual change is shallow, until last disappear, prevents powder from axially spinning, while feeding section screw rod uses double end spiral shell rib, improves charging ability； To improve compression section clogging, compression section BD point is the first compression section BC and the second compression section CD, the first compression section compression ratio Less than the second compression section, while the second compression section CD and above metering section is provided with barrel pins, stir one along material circumference by force In week, promote the consolute of material.But it in the conveying of feeding section powder solid plug, compression section material is half still not overcome single screw rod Solid, it is difficult to be sufficiently mixed close to machine barrel side and close to spiral shell rib groove side, melt is the band of screw when extruding from metering section Shape thing.
Twin-screw mixer plastifies.
Twin-screw has higher shear ability and stronger conveying capacity, and two screw rods mesh together, and material is strong System promotes, and material plug will not be formed as single screw extrusion machine, but as melt and continue to cut by material compacting in fluxing zone Propulsion is cut, is finally conveyed material into mould in metering section, twin-screw extrusion can effectively solve skidding of the melt in barrel and show As, thus the efficient continuous plastication of ultra-high molecular weight polyethylene can be realized.The CN1462682A of Jiangsu Shengjie Industry Co., Ltd. A kind of double screw extruder for medium-high viscosity system is disclosed, its two screw rods pass through engagement type spiral shell rib element and non-engagement Type spiral shell rib element arrangements combine to be formed, and are taken off in the leading portion of Heterodromy double-screw extruder using non-engagement type screwing element Processing is waved, makes it have good mixing property, small to material cutting, surface of material regeneration area is big, the capacious spy in region of engagement Point, make it that there is the free volume of larger steam in exhaust section, it is easy to accomplish to be vented the optimum efficiency of devolatilization；Use and nibble in back segment Mould assembly screwing element, using its preferable transportation performance and self-cleaning effect, avoid making the material after the completion of devolatilization for a long time be detained In in cylinder.As can be seen here, this incongruous double screw extrusion combined by engagement type screwing element with non-engagement type screwing element Machine has had both the advantages of two kinds of counter rotation twin screw extruders of engagement type and non-engagement type, while overcomes the shortcomings that respective, one The dual-use function feature of two kinds of double screw extruders in the prior art is realized on platform counter rotation twin screw extruder.But above-mentioned hand Section does not reinforce simultaneously primarily directed to devolatilization, other functions.
Thus, it is desirable to design a kind of ultra-high molecular weight polyethylene screw extruder, existing single screw rod plasticizing, twin-screw are broken through The defects of being kneaded plasticizing.
The content of the invention
For defect present in above-mentioned prior art, it is an object of the invention to provide a kind of ultra-high molecular weight polyethylene Plasticized screw extruder.
The object of the present invention is achieved like this, a kind of ultra-high molecular weight polyethylene plasticized screw extruder, including one-level Screw rod and two level screw rod, the rotation axis of the one-level screw rod are intersected and connected with inclination angle with the rotation axis of two level screw rod； The one-level screw rod includes compression feeding mechanism, planet is kneaded mechanism and one-level drive gear, and the compression feeding mechanism includes Main body and compression moulding screw rod are fed, compression moulding screw rod is by one-level driving gear drives rotatable engagement in main body is fed；Planet kneading machine Structure rotates the lower periphery for being engaged on compression moulding screw rod；Two level screw rod includes metering machine barrel, kneading screw and secondary drive gear, mixes Refining screw rod is rotatably provided in metering machine barrel by the driving of secondary drive gear；
Also include coordinated drive mechanism, the coordinated drive mechanism includes motor, driving cone, and driving cone is provided with axle To spaced helical rack, one-level drive gear and secondary drive gear are engaged on the helical rack respectively.
Further, feed in main body and be provided with material chamber, compression taper hole；Compression moulding screw rod includes compression cone and center bolt Portion, compression cone are rotatably provided in compression taper hole.
Further, planet, which is kneaded mechanism, includes planet machine barrel and planetary-screw, and charging body exit is fixedly connected with planet Machine barrel, at least 6 planetary-screws are engaged between planet machine barrel and center bolt portion.
Further, the inclination feeding cylinder that machine barrel includes with inclination angle intersecting with measuring the rotation axis of machine barrel, institute are measured Stating compression moulding screw rod also includes conveying screw rod portion, and conveying screw rod portion rotatable engagement is in the inclination feeding cylinder.
Further, the kneading screw includes feed zone, and the feed zone is provided with the strong of 3~6 circles and send spiral shell rib, described strong Spiral shell rib is sent to form rotation profile, the rotation profile adapts to tilt feeding cylinder and measures the space that machine barrel is crossed to form, rotating wheel Exterior feature is maximum for mid diameter, and both sides diameter is approximately equal to the convex curve of metering cylinder bore.
Further, the inclination angle is between 45o~60o.
Further, the helical rack includes the first helical rack of reduced diameter section and the second helical tooth of enlarged diameter section Bar, the one-level drive gear engage the second helical rack, and the secondary drive gear engages the first helical rack.
Further, in addition to drive shell, it is respectively equipped with and is arranged in pairs at drive shell bottom in the drive shell Compression moulding screw shaft bearing, driving cone bearing block and kneading screw bearing block on plate and top plate, the driving cone bearing block Bearing rotary axis respectively with the bearing rotary axis of compression moulding screw shaft bearing and the bearing rotary axle of kneading screw bearing block Line has identical angle.
Further, the compression cone is provided with continuous compression helicla flute and preheating screw groove, and feeds main body Steam vent is provided with compression helicla flute correspondence position on wall, compresses spiral groove depth continuously from depth to shallow.
Further, compress screw rod and guide portion is provided with above compression cone, the guide portion, which is provided with, to be used for powder It is sent into the deflector chute of compression helicla flute entrance.
The ultra-high molecular weight polyethylene plasticized screw extruder, in order to solve " being suitable to ultra-high molecular weight polyethylene to be kneaded " The technical problem of " the defects of breaking through existing single screw rod plasticizing, twin-screw mixer plasticizing ", mainly takes following improve and arranges Apply：
1）Compression moulding screw rod realizes that the compression of powder is promoted and plastified simultaneously
The guide portion of compression moulding screw rod, compression cone constantly by powder compression and helical feed to feeding body exit, solid-state Powder is compressed through effectively being plastified between center bolt and planetary-screw, reaches high viscoelastic body state；
The compression conveying of powder overcomes the high degree of dispersion defect of prior art screw rod transmission, the powder pressure in helicla flute is compressed Contracting body obtains effective in preheating screw groove, and the efficiency of heating surface greatly improves.
2）The coordinated drive of one-level screw rod and two level screw rod
Charging plasticizing and mixing metering are realized respectively using two rank extruder modes, but prior art is typically using individually drive Dynamic mode, and the side for using the rotation axis of one-level screw rod to intersect and connect with inclination angle with the rotation axis of two level screw rod Formula, then the connected middle vacuum room of usual two-stage extrusion machine is eliminated, while one-level sliding tooth is driven using driving cone simultaneously Wheel and secondary drive gear, obtain fixed gearratio, eliminate an engine.
By the mutual cooperation of structure in terms of two above, accomplish jointly in powder compression charging, compression preheating simultaneously Shear melting, while cause the driving of two level screw rod to drive the driving structure of one-level screw rod, simple and ingenious structure, suitable for viscous simultaneously Spend big raw material components cannot not have moltenly the plasticizing of raw material of particle more.
Brief description of the drawings
Fig. 1 is the main sectional view of ultra-high molecular weight polyethylene plasticized screw extruder embodiment of the present invention.
Reference in above-mentioned figure：
100 one-level screw rods, 200 two level screw rods, 300 coordinated drive mechanisms, 400 drive shells
10 compression feeding mechanisms, 20 planets are kneaded mechanism, and 30 are kneaded metrological service, 40 motors, and 50 activation points are adjusted Complete machine structure
1 charging main body, 2 compression moulding screw rods, 3 material chambers, 4 compression taper holes, 5 guide portions, 6 compression cones, 7 center bolt portions, 8 Compress helicla flute, 9 preheating screw grooves, 11 one-level drive gears, 12 one-level drive shafts, 13 compression moulding screw shaft bearings, between 14 Have a rest feed mechanism, 15 conveying screw rod portions
21 planet machine barrels, 22 planetary-screws, 23 top flanges, 24 internal tooths, 25 thrust rings
31 metering machine barrels, 32 kneading screws, 33 tilt feeding cylinder, and 34 secondary drive gears, 35 secondary drive axles, 36 is mixed Refine screw shaft bearing
41 driving cones, 42 helical racks, 42.1 first helical racks, 42.2 second helical racks, 43 driving cone axis Bearing.
Embodiment
Embodiments of the invention are elaborated below in conjunction with accompanying drawing, but are not limited to the scope of the present invention.
As illustrated, a kind of ultra-high molecular weight polyethylene plasticized screw extruder, including one-level screw rod 100 and two level screw rod 200, the rotation axis of the one-level screw rod 100 is intersected and connected with inclined angle alpha with the rotation axis of two level screw rod 200；It is described One-level screw rod 100 includes compression feeding mechanism 10, planet is kneaded mechanism 20, and the two level screw rod 200 includes being kneaded metrological service 30, the compression feeding mechanism 10 includes charging main body 1 and compression moulding screw rod 2, and compression moulding screw rod 2 is rotatably provided in charging main body 1； Feed and material chamber 3, compression taper hole 4 are provided with main body 1；Expect that chamber 3 and compression taper hole 4 are hollow rotating body；Expect that chamber 3 connects interval feeding Mechanism 14.Compression moulding screw rod 2 is sequentially provided with the guide portion 5 of positive cone, the compression cone 6 of back taper and center bolt portion 7, described to lead Material portion 5 is in material chamber 3, and the compression rotatable engagement of cone 6 is in the compression taper hole 4；Compression cone 6 is provided with helical angle In continuous the compression helicla flute 8 and preheating screw groove 9 less than or equal to 45o, and feed on the wall of main body 1 in compression helicla flute pair Position is answered to be provided with steam vent, the compression spiral groove depths of preceding 3-6 circles is continuously from depth to shallow；Guide portion 5, which is provided with, to be used for powder It is sent into the deflector chute of compression helicla flute entrance；Powder is through helicla flute continued compression and preheats, and continues spiral from the outlet of charging main body 1 Export solid compressed stream.Compression moulding screw rod 2 is provided with one-level drive shaft 12 and the one-level drive gear being fixed in one-level drive shaft 11。
Planet, which is kneaded mechanism 20, includes planet machine barrel 21, planetary-screw 22, and the charging main body 1 is by exporting location division 1.1 are fixedly connected with the top flange 23 of the planet machine barrel 21, and planet machine barrel has internal tooth 24；At least 6 planetary-screws 22 revolve Turn to be engaged between planet machine barrel 21 and center bolt portion 7；The end of planet machine barrel 21 is provided with thrust ring 25.Center bolt portion 7 is wrapped Include positive cone pressure-reducing screw rod section 7.1 and cylindrical shear screw section 7.2；Center bolt portion 7 has the continuous spiral shell of 45o helical angles Rib.The solid compressed stream is kneaded the heating melting during continuous shear stress stretches flakiness of mechanism 20 through planet and becomes in blocks The high viscoelastic body of shape, and export spiral from planet machine barrel 21 and be output in two level screw rod 200；
The mixing metrological service 30 of two level screw rod 200 includes metering machine barrel 31, kneading screw 32, and kneading screw 32 is rotatably provided in Measure in machine barrel 31, metering machine barrel 31 has the inclination feeding cylinder 33 intersected with measuring the rotation axis of machine barrel with inclined angle alpha, inclines Oblique barrel 33 is connected to the end of planet machine barrel 21.The compression moulding screw rod 2 also includes conveying screw rod portion 15, the conveying screw rod The rotatable engagement of portion 15 is in the inclination feeding cylinder 33.Kneading screw 32 is provided with secondary drive axle 35 and is fixed on secondary drive axle Secondary drive gear 34 on 35.In the feed zone of two level screw rod 200, kneading screw 32 is provided with and send spiral shell rib 35 by force, and 3-6 is enclosed strong Spiral shell rib 35 is sent to form rotation profile L, the rotation profile L adapts to tilt feeding cylinder 33 and metering machine barrel 31 is intersected with inclined angle alpha The space of formation, rotation profile L have mid diameter maximum, and both sides diameter is approximately equal to the convex curve spy of the metering internal diameter of machine barrel 31 Sign.The kneading screw 32 is single screw rod or double engagement screws or planetary-screw structure.
Inclined angle alpha is preferably between 45o~60o.
Also include coordinated drive mechanism 300, the coordinated drive mechanism 300 includes motor 40, driving cone 41, institute Driving cone 41 described in the rotation driving of motor 40 is stated, the rotation axis of the driving cone 41 is set respectively with compressing screw rod There is 2 rotation axis and kneading screw 32 identical driving angle β, the driving angle β to be equal to the half of inclined angle alpha, thus Determine that the lower engagement bus of driving cone 41 is horizontal and parallel to the rotation axis of kneading screw 32, upper engagement bus parallel to The rotation axis of compression moulding screw rod 2, and one-level drive gear 11 and secondary drive gear 34 have identical reference diameter DDrive.Institute The axially spaced multiple helical racks 42 of arrangement in driving cone 41 are stated, the rotation of one-level drive gear 11 is engaged on positioned at drive Helical rack 42 on the upper engagement bus of movable cone 41；The rotation of secondary drive gear 34 is engaged on positioned at driving cone 41 Lower engagement bus on cone tooth 42.
The rotation of the upper end of compression moulding screw rod 2 stretches out charging main body 1 and is externally provided with one-level drive shaft 12, consolidates in the one-level drive shaft 12 Surely there are one-level drive gear 11 and activation point adjustment mechanism 50, the one-level drive shaft 12 is provided with keyway 51, one-level driving Gear 11 is coordinated in keyway 51 by slide key 52, and activation point adjustment mechanism 50 drives position of the slide key 52 in keyway 51 Put to adjust it is engaged with which row helical rack 42；The left end of kneading screw 32 is externally provided with secondary drive axle 5 in metering machine barrel 31, Secondary drive gear 34 and activation point adjustment structure 50 are provided with secondary drive axle 35, the secondary drive axle 35 is provided with Keyway 51, secondary drive gear 34 are coordinated in keyway 51 by slide key 52, and activation point adjustment mechanism 50 drives slide key Which partly engaged with helical rack 42 to adjust it 52 position in keyway 51.
The helical rack 42 includes the first helical rack 42.1 of reduced diameter section and the second helical rack of enlarged diameter section 42.2, the one-level drive gear 11 is engaged on the second helical rack 42.2, and secondary drive gear 34 is engaged on the first spiral On rack 42.1.So, the rotation of one-level screw rod 100 and two level screw rod 200 can be met simultaneously using a motor 40 Driving, meanwhile, coordinated drive mechanism 300 can reach the rotation of compression moulding screw rod 2 and the rotation of kneading screw 32 turns with fixed Fast ratio.Labor is as follows：
Assuming that the reference diameter of the first helical rack 42.1 is DIt is small, the reference diameter of the second helical rack 42.2 is DGreatly, then Drive the second gearratio i of the first helical rack 42.1 and secondary drive gear 34 of cone2For i2=driving gear rotating speed/driven Gear rotational speed=driving cone the number of teeth/secondary drive number of gear teeth=DDrive/DIt is small；Drive the second helical rack 42.2 and one-level of cone First gearratio i of drive gear 111For i1=driving gear rotating speed/driven gear rotating speed=driving cone the number of teeth/one-level sliding tooth Tooth number=DDrive/ DGreatly；Therefore, the second gearratio i2More than the first gearratio i1, and the two has fixed proportion, i2/ i1= DGreatly/ DIt is small.Therefore, because the second helical rack 42.2 of major diameter drives one-level drive gear 11 slowly to rotate, and the of minor diameter One helical rack 42.1 driving kneading screw 32 is rotated with fast speed, and compression charging, shearing mixing need rotating speed relatively slow, And the kneading screw of metering section then needs quickly to rotate, the high-elastic condition of ultra-high molecular weight polyethylene is maintained.
In order to ensure that the rotation axis of compression screw rod 2 and kneading screw 32 have identical driving angle β, the supra polymer Weight northylen plasticized screw extruder also includes drive shell 400, is respectively equipped with and is arranged in pairs in the drive shell 400 Compression moulding screw shaft bearing 13, driving cone bearing block 43 and kneading screw bearing block 36 on drive shell bottom plate and top plate.Institute State the bearing rotary axis of driving cone bearing block 43 the bearing rotary axis with compression moulding screw shaft bearing 12, kneading screw respectively The bearing rotary axis of bearing block 37 has identical angle, equal to the half of inclined angle alpha.
The ultra-high molecular weight polyethylene plasticized screw extruder, accomplish in powder compression charging, compression preheating simultaneously Shear melting, while cause the driving of two level screw rod to drive the driving structure of one-level screw rod, simple and ingenious structure, suitable for viscous simultaneously Spend big raw material components cannot not have moltenly the plasticizing of raw material of particle more.

Claims (10)

  1. A kind of 1. ultra-high molecular weight polyethylene plasticized screw extruder, it is characterised in that
    Including one-level screw rod（100）With two level screw rod（200）, the one-level screw rod（100）Rotation axis and two level screw rod （200）Rotation axis with inclination angle（α）Intersect and connect；
    The one-level screw rod（100）Including compressing feeding mechanism（10）, planet be kneaded mechanism（20）With one-level drive gear（11）, The compression feeding mechanism（10）Including feeding main body（1）With compression moulding screw rod（2）, compression moulding screw rod（2）Driven by one-level drive gear Dynamic rotatable engagement is in charging main body（1）In；Planet is kneaded mechanism rotation and is engaged on compression moulding screw rod（2）Lower periphery；
    Two level screw rod（200）Including measuring machine barrel（31）, kneading screw（32）With secondary drive gear（34）, kneading screw（32） By secondary drive gear（34）Driving is rotatably provided in metering machine barrel（31）In；
    Also include coordinated drive mechanism（300）, the coordinated drive mechanism（300）Including motor（40）, driving cone （41）, drive cone（41）It is provided with the helical rack of axially spaced-apart arrangement（42）, one-level drive gear（11）And secondary drive Gear（34）It is engaged on respectively on the helical rack.
  2. 2. ultra-high molecular weight polyethylene plasticized screw extruder as claimed in claim 1, it is characterised in that charging main body（1）It is interior Provided with material chamber（3）, compression taper hole（4）；Compression moulding screw rod（2）Including compressing cone（6）With center bolt portion（7）, compress cone（6） It is rotatably provided in compression taper hole（4）In.
  3. 3. ultra-high molecular weight polyethylene plasticized screw extruder as claimed in claim 2, it is characterised in that planet is kneaded mechanism （20）Including planet machine barrel（21）And planetary-screw（22）, feed body exit and be fixedly connected with planet machine barrel（21）, at least 6 rows Starshell bar（22）It is engaged on planet machine barrel（21）With center bolt portion（7）Between.
  4. 4. ultra-high molecular weight polyethylene plasticized screw extruder as claimed in claim 3, it is characterised in that metering machine barrel（31）Bag The rotation axis with metering machine barrel is included with inclination angle（α）Intersecting inclination feeding cylinder（33）, the compression moulding screw rod（2）Also include defeated Send threaded shank（15）, the conveying screw rod portion（15）Rotatable engagement is in the inclination feeding cylinder（33）In.
  5. 5. ultra-high molecular weight polyethylene plasticized screw extruder as claimed in claim 4, it is characterised in that the kneading screw （32）Including feed zone, the feed zone is provided with the strong of 3~6 circles and send spiral shell rib（35）, it is described to send spiral shell rib by force（35）Form rotating wheel It is wide（L）, the rotation profile（L）Adapt to tilt feeding cylinder（33）With metering machine barrel（31）The space being crossed to form, rotation profile （L）Maximum for mid diameter, both sides diameter is approximately equal to metering machine barrel（31）The convex curve of internal diameter.
  6. 6. ultra-high molecular weight polyethylene plasticized screw extruder as claimed in claim 1, it is characterised in that the inclination angle（α） Between 45o~60o.
  7. 7. ultra-high molecular weight polyethylene plasticized screw extruder as claimed in claim 1, it is characterised in that the helical rack （42）The first helical rack including reduced diameter section（42.1）With the second helical rack of enlarged diameter section（42.2）, the one-level drive Moving gear（11）Engage the second helical rack（42.2）, the secondary drive gear（34）Engage the first helical rack（42.1）.
  8. 8. ultra-high molecular weight polyethylene plasticized screw extruder as claimed in claim 1, it is characterised in that also including drive shell （400）, the drive shell（400）On be respectively equipped with the compression moulding screw shaft being arranged in pairs on drive shell bottom plate and top plate Bearing（13）, driving cone bearing block（43）With kneading screw bearing block（36）, the driving cone bearing block（43）Bearing Rotation axis respectively with compression moulding screw shaft bearing（12）Bearing rotary axis and kneading screw bearing block（37）Bearing rotary Axis has identical angle.
  9. 9. ultra-high molecular weight polyethylene plasticized screw extruder as claimed in claim 8, it is characterised in that the compression cone （6）It is provided with continuous compression helicla flute（8）With preheating screw groove（9）, and feed main body（1）Wall in compression helicla flute pair Answer position to be provided with steam vent, compress spiral groove depth continuously from depth to shallow.
  10. 10. ultra-high molecular weight polyethylene plasticized screw extruder as claimed in claim 9, it is characterised in that compression screw rod（2） Compress cone（6）Top is provided with guide portion（5）, the guide portion, which is provided with, to be used to powder being sent into leading for compression helicla flute entrance Hopper.
CN201711067903.1A 2017-11-03 2017-11-03 A kind of ultra-high molecular weight polyethylene plasticized screw extruder Active CN107685436B (en)

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Publication number Priority date Publication date Assignee Title
CN109878056A (en) * 2019-04-18 2019-06-14 应佳慧 A kind of screw extruder of positive feed
CN109986755A (en) * 2018-12-03 2019-07-09 浙江华晨螺杆制造有限公司 A kind of segmented plasticizing injecting device and its processing technology
AT522057A1 (en) * 2019-01-18 2020-08-15 Engel Austria Gmbh Plasticizing unit for an injection molding machine
CN113026401A (en) * 2019-12-25 2021-06-25 曲阜市海华高科技有限公司 Method for compounding ultrahigh molecular weight polyethylene film with PTFE film and then twisting and cord manufactured by using method

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CN205395087U (en) * 2016-03-04 2016-07-27 东莞市恒丰高新技术开发有限公司 Biodegradable plastic double row star screw extruder
CN205800136U (en) * 2016-05-13 2016-12-14 上海龙山凤机器制造有限公司 Fixed star screw rod curtain coating extruder

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CN109986755A (en) * 2018-12-03 2019-07-09 浙江华晨螺杆制造有限公司 A kind of segmented plasticizing injecting device and its processing technology
AT522057A1 (en) * 2019-01-18 2020-08-15 Engel Austria Gmbh Plasticizing unit for an injection molding machine
AT522057B1 (en) * 2019-01-18 2020-09-15 Engel Austria Gmbh Plasticizing unit for an injection molding machine
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CN109878056A (en) * 2019-04-18 2019-06-14 应佳慧 A kind of screw extruder of positive feed
CN113026401A (en) * 2019-12-25 2021-06-25 曲阜市海华高科技有限公司 Method for compounding ultrahigh molecular weight polyethylene film with PTFE film and then twisting and cord manufactured by using method

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Patentee before: Xu Mengyan