CN105109015A - Screw support device and twin-screw extruder with same - Google Patents
Screw support device and twin-screw extruder with same Download PDFInfo
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- CN105109015A CN105109015A CN201510537253.7A CN201510537253A CN105109015A CN 105109015 A CN105109015 A CN 105109015A CN 201510537253 A CN201510537253 A CN 201510537253A CN 105109015 A CN105109015 A CN 105109015A
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- outer ring
- screw
- screw support
- inner ring
- ring
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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
- B29C48/505—Screws
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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
- B29C48/395—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
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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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention provides a screw support device and a twin-screw extruder with the same. The screw support device comprises a screw support element or a plurality of screw support elements. The screw support element/screw support elements is/are installed on a screw mandrel. Each screw support element comprises an inner ring and an outer ring, wherein the inner ring is installed on the screw mandrel and rotates along with the screw mandrel; a machine cylinder is provided with a structure limiting the rotation of the outer ring; the axial length of the outer ring is smaller than the axial length of the inner ring; the space between the outer ring, in the radial direction, and the inner wall of the machine cylinder is smaller than the space between a screw flight of a screw and the inner wall of the machine cylinder; the inner ring and the outer ring rotate relatively. Each screw support element is provided with fluid passages. The arrangement form/forms of the screw support elements on the two screws is/are a staggered arrangement or/and a symmetry arrangement. According to the twin-screw extruder with the screw support device, a position or a plurality of different positions of each screw is/are supported, so that the abrasion between the screws and the machine cylinders is eliminated.
Description
Technical field
The present invention relates to a kind of screw support device, particularly a kind of screw support device for double screw extruder, and there is the double screw extruder of this device.
Background technology
The mixed performance of the polytropy that double screw extruder brings with its modular construction and adaptability and excellence, is widely applied in the polymer processing such as shaping, blended, modification, reactive extrursion.Double screw extruder mainly comprises transmission system, charging system, extrusion system, heating and cooling system, control system, and wherein extrusion system is the core of double screw extruder, mainly comprises screw rod and machine barrel.Material adds machine barrel by charging system, the rotation of machine barrel inner screw produces the effect such as helical feed and mixing to material, make material experience the extrusions such as Solid Conveying and Melting, melting, exhaust, mixing and melt Conveying, finally extruded by head, cause particle or be shaped to goods.
Screw rod is double screw extruder " heart ", and most of screw rod is modular construction, comprises mandrel, screw element and screw head, and screw element combination is arranged on mandrel, is tightened by screw head.Screw element comprises the function element such as delivery element, shearing elements, hybrid element, and different screw elements can be combined into the screw rod of different configuration.
The supporting way of screw rod adopts cantilever structure usually, and Support Position is at screw root, and screw root is connected with the output shaft of gear-box by adapter sleeve, and screw body and head are all unsettled in machine barrel.For guaranteeing conveying capacity and the upbuild voltage capacity of screw rod, the clearance control between the spiral shell rib of screw rod and machine barrel is (gap is generally 0.002 times of cylinder bore to 0.05 times) in very little scope.When the draw ratio material viscosity that is very large or that process of screw rod is lower or in machine barrel, material is inadequate, material in machine barrel is not enough to float screw rod, flexible deformation is there is in screw rod under the effect of self gravitation and centrifugal force etc., when the flexible deformation of screw rod is greater than the gap between the spiral shell rib of screw rod and machine tube inner wall, more serious wearing and tearing can be produced between the spiral shell rib of screw rod and machine tube inner wall, the gap between the spiral shell rib of screw rod and machine tube inner wall is increased.If wearing and tearing occur in melt zone, then cause melt capacity to decline, and cause non-uniform temperature and pressure oscillation; If wearing and tearing occur in melt conveying zone, melt Conveying ability can be made to decline; Gap between the spiral shell rib of screw rod and machine tube inner wall increases, and also can reduce the heat transference efficiency of machine barrel and storeroom.
Summary of the invention
In view of this, the invention provides a kind of screw support device for double screw extruder, this device comprises one or more screw support element, described screw support element is arranged on screw mandrel together with other screw element (as delivery element, shearing elements, hybrid element etc.), and can independent assortment, two screw rods of a double screw extruder can install one or more screw support element respectively, one or more diverse locations of screw rod are supported, thus eliminates the wearing and tearing between screw rod and machine barrel.
Described screw support element is made up of two parts: one is inner ring, and inner ring is arranged on the mandrel of screw rod, rotates with screw rod; Two is outer rings, coordinates with the inwall of described machine barrel.Relatively rotate between described inner ring and described outer ring.
The outer ring of described screw support element coordinates with described machine tube inner wall, and described machine barrel is provided with the structure limiting described outer ring rotating, thus described outer ring can not be rotated in described machine barrel.Particularly, the outer surface of described machine tube inner wall and described outer ring is provided with intermeshing structure.
The axial length of described outer ring is less than the axial length of described inner ring, the end face of described inner ring and other screw element is mutually adjacent to and is arranged on described screw mandrel in the same manner, described outer ring does not contact with other screw element, and described inner ring and described outer ring relatively rotate.
The gap of described outer ring in radial directions and between described machine tube inner wall is less than the gap between the spiral shell rib of described screw rod and described machine tube inner wall, when there is flexible deformation in described screw rod under the effect of self gravitation and centrifugal force etc., first described outer ring is crushed on described machine tube inner wall, described screw rod is played a supporting role, other screw element can not contact with described machine tube inner wall, thus eliminates the wearing and tearing between screw rod and machine barrel.
Screw support element is provided with fluid passage, so that material passes through.The form that arranges of fluid passage includes but not limited to following three kinds.
Preferably, described outer ring is provided with fluid passage.The setting of this fluid passage and easy to process.
Selectively, described inner ring is provided with fluid passage.Material rotates with screw rod by during this fluid passage, has the shear-mixed effect perpendicular to flow direction when entering fluid passage and go out fluid passage to material.
Selectively, described outer ring and described inner ring are all provided with fluid passage.This set method fluid passage is many, and distributed rendering is effective.
During double screw extruder work, screw rod continuous rotation, material is continuously to heading flowing under the helical feed effect of screw rod, and the fluid passage of material set by from described screw support element is flow through, and the continuous-flow of material can produce unidirectional axial compressive force to described screw support element.The end face of described inner ring and adjacent screws element is mutually adjacent to and is arranged on described mandrel in the same manner, and the relatively described screw rod of described inner ring, by completely spacing, comprises axial and radial.Described outer ring can not rotate in described machine barrel, and radial and described machine barrel coordinates, and plays a supporting role to described screw rod.
Further, establish lubrication groove in the both ends of the surface of described outer ring, under fluid field pressure effect, be pushed to adjacent screw element when described outer ring and produce with its end contact when rubbing, the material continued through in described lubrication groove produces lubrication.
Further, in order to the one direction axial compressive force that balanced fluid produces described screw support element, improve the stability of described screw support element manipulation, can to described outer ring one direction axial limiting, spacing direction is identical with Flow of Goods and Materials direction, namely stops described outer ring to move axially with material.Realize can having multiple to the mode of described outer ring one direction axial limiting.
Preferably, the mating surface between the outer ring of described screw support element and inner ring is the face of cylinder, and the discharge end of described inner ring is provided with rib, thus carries out axial limiting to described outer ring.Further, the end face of described outer ring is provided with lubrication groove, to relatively rotating lubricate between rib set on described outer ring and described inner ring when fluid continues through described lubrication groove.
Selectively, mating surface between the outer ring of described screw support element and inner ring is taper seat, inner surface by described outer ring is set to taper seat, the outer surface of described inner ring is set to taper seat, and both taperings are equal, the diameter of described outer ring bigger diameter end is less than the diameter of described inner ring bigger diameter end, the diameter of described outer ring miner diameter end is greater than the diameter of described inner ring miner diameter end, described outer ring is pushed to the bigger diameter end of described inner ring under fluid field pressure effect, thus realizes the axial limiting to described outer ring.
Further, in order to improve the stability of described screw support element manipulation further, make described outer ring under any circumstance (comprise machine barrel in without material time) all can not move axially, can be spacing to described outer ring bi-directional axial.Realizing the mode spacing to described outer ring bi-directional axial can have multiple.
Preferably, the part contacted with each other at described inner ring and described outer ring is provided with intermeshing structure, to limit described inner ring and axial relative movement occurs in described outer ring, reality is spacing to the bi-directional axial of described outer ring, in order to both are assembled together smoothly, opposite opened is arranged in described outer ring, is that two parts are assembled together by connector by outer ring subdivision.Further, can be the structure that curved surface smoothly transits by described inner ring and the described outer ring intermeshing vibrational power flow of contact portion, be conducive to material and be smoothly through gap between described inner ring and described outer ring.Further, can also be mating spherical surfaces structure by described inner ring and the described outer ring intermeshing vibrational power flow of contact portion, except carrying out axial limiting to described outer ring, screw support element can also be made automatically to adjust to adapt to the deflection of screw rod with the flexible deformation of screw rod, prevent " the edge friction " of described inner ring and described outer ring, to avoid the wearing and tearing of described screw support element ends.Further, in order to install location, the split surface that two parts of described outer ring contact with each other is set to staged.
Selectively, mating surface between the outer ring of described screw support element and inner ring is taper seat, the inner surface of described outer ring is set to taper seat, described inner ring is combining structure, comprise inner ring body and be arranged on the spacing back-up ring on described inner ring body, the outer surface of described inner ring body is set to taper seat, and it is equal with the tapering of taper seat set by described inner surface, the diameter of described outer ring bigger diameter end is less than the diameter of described inner ring body bigger diameter end, the diameter of described outer ring miner diameter end is greater than the diameter of described inner ring body miner diameter end, described spacing back-up ring is arranged on the miner diameter end of described inner ring body, realize spacing to the bi-directional axial of described outer ring by described taper seat fit structure and described spacing back-up ring.By twisting described spacing back-up ring, the fit clearance between described outer ring and described inner ring body can also be regulated, when described spacing back-up ring is twisted toward the bigger diameter end of described inner ring body, described outer ring is pushed to the bigger diameter end of described inner ring body, the gap smaller between described outer ring and described inner ring body; When being twisted toward the miner diameter end of described inner ring body by described spacing back-up ring, described outer ring can be moved to the miner diameter end of described inner ring body, and the gap between described outer ring and described inner ring body becomes large.Further, the end face that described spacing back-up ring contacts with described outer ring is provided with lubrication groove, to relatively rotating lubricate between described outer ring and described spacing back-up ring when fluid continues through described lubrication groove.
Further, for the benefit of lubrication of described inner ring and described outer ring mating surface, can establish lubrication groove at the inner surface of the outer surface of described inner ring or described outer ring.Described lubrication groove can be the dynamic lubrication groove of straight trough, skewed slot, helicla flute or other shape, and skewed slot and helicla flute can be left-leaning or Right deviation.
Further, be detained at the gap location of described outer ring and described machine tube inner wall for avoiding material, the outer surface mounting sealing device that can coordinate with described machine tube inner wall in described outer ring, according to the product type of twin-screw extrusion machined, select the described sealing device with suitable heat resistance, decay resistance and compressive property.
Two screw rods of a double screw extruder can install one or more described screw support element respectively, described screw support element on two screw rods can with other screw element independent assortment, set-up mode can have multiple.
Preferably, described screw support element is crisscross arranged on two screw rods.Described screw support element supports a wherein screw rod in axial a certain position, and has mass transport ability at another root screw rod of axial same position, and this setup makes screw rod have continual mass transport ability.
Selectively, described screw support element is symmetrical arranged on two screw rods.This setup makes the supporting form of two screw rods identical, and structure is close with stressing conditions, coordinates to rotate more to balance.
It should be noted that, can according to actual needs, the combination that the described screw support element on a double screw extruder can be interlaced arrangement and be arranged symmetrically with, to realize the optimum of screw support and mass transport.
In addition, the present invention also provides a kind of double screw extruder, it is characterized in that this double screw extruder have employed above-mentioned screw support device, supports one or more diverse locations of screw rod, thus eliminates the wearing and tearing between screw rod and machine barrel.
Screw support device of the present invention is arranged on screw mandrel by building block system, does not affect the normal dismounting of screw rod, has following effect.
There is the double screw extruder of this screw support device, eliminate the wearing and tearing between screw rod and machine barrel, extend the service life of screw rod and machine barrel, decrease downtime, reduce cost of equipment maintenance.
Have the double screw extruder of this screw support device, the draw ratio of screw rod can do to obtain very large (being greater than 120).Big L/D ratio double screw extruder has two-layer advantage: one, and when screw speed is constant, big L/D ratio can bring the longer time of staying.The prolongation of the time of staying is conducive to the abundant reaction of storeroom in reactive extrursion process, brings higher reactivity and better product quality; Be conducive to swelling in aramid fiber gel spinning, ultrahigh molecular weight polyethylene gel spinning and PAN base carbon fiber protofilament gel spinning technical process and the unwrapping to macromolecular chain ball of string winding arrangement.Its two, when the time of staying is constant, can screw speed be improved, thus improve the output of double screw extruder; Simultaneously the high-rate of shear that brings of high rotating speed, is conducive to the mixing of material, is conducive to the raising of quality of item.
Have the double screw extruder of this screw support device, material is divided into multiply by multiple fluid passages of described screw support element, also helps the distributed rendering to material.
Screw support device of the present invention can be applicable to all types of double screw extruder, comprises parallel type in the same way, parallel incorgruous type, engagement type, half engagement type, non-engagement type, conical parallel dual type, the incorgruous type of taper etc.
Accompanying drawing explanation
The Figure of description forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Figure 1A is the double screw extruder cross-sectional schematic with screw support device of the present invention;
Figure 1B is the double screw extruder partial schematic sectional view with screw support device of the present invention;
Fig. 2 and Fig. 3 is the structural representation of screw support element;
Fig. 4 A, Fig. 4 B, Fig. 4 C, Fig. 4 D and Fig. 4 E are that the fluid passage of screw support element arranges schematic diagram;
Fig. 5 is the structural representation that both ends of the surface are provided with the outer ring of lubrication groove;
Fig. 6 is the one-sided structural representation being provided with the screw support element of rib of inner ring;
The structural representation of Fig. 7 to be mating surface between outer ring and inner ring be screw support element of taper seat;
Fig. 8 A, Fig. 8 B, Fig. 8 C and Fig. 8 D are the structural representation that part that inner ring and outer ring contact with each other is provided with the screw support element engaging each other structure;
Fig. 8 E is the structural representation of the screw support element with opposite opened outer ring;
Fig. 9 A is the structural representation of the screw support element with combined inner ring;
Fig. 9 B is the structural representation of the inner ring body of combined inner ring;
Fig. 9 C is the structural representation of the spacing back-up ring of combined inner ring;
Figure 10 A, Figure 10 B and Figure 10 C are the structural representation that inner ring outer surface establishes lubrication groove;
Figure 11 is the structural representation installing the screw support device of the present invention of two groups of sealing devices at outer ring outer surface;
Figure 12 A, Figure 12 B and Figure 12 C are the structural representation that screw support element arranges form on two screw rods.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiments of the invention are described in detail, but the multitude of different ways that the present invention can be defined by the claims and cover realizes and is not limited to embodiment as herein described.In addition, these embodiments are full disclosure the present invention, is convenient to the complete understanding of those skilled in the art to right.Clear for convenience of description, the size of level each in figure, area part and relative size have been carried out exaggerating process.In accompanying drawing, identical label represents identical element.
As shown in Figure 1A, in double screw extruder, power is provided by motor 60, torque distribution and deceleration is carried out through gear-box 50, screw rod 20 is connected with the output shaft of gear-box 50 by adapter sleeve 40, material enters machine barrel 30 by charge door 30a, the rotation of machine barrel 30 inner screw 20 produces the effect such as helical feed and mixing to material, material is made to experience the extrusions such as Solid Conveying and Melting, melting, exhaust (being discharged by exhaust outlet 30b), mixing and melt Conveying, finally extruded by head 30c, cause particle or be shaped to goods.Screw support device in the present embodiment comprises two (or two to) screw support elements 10, described screw support element 10 and other screw element 22(are as delivery element, shearing elements, hybrid element etc.) together be arranged on screw mandrel 21, tightened by screw head 23.As shown in Figure 1B, the clearance C 1 of screw support element 10 in radial directions and between machine barrel 30 inwall is less than the clearance C 2 between the spiral shell rib 22a of screw rod 20 and machine barrel 30 inwall, when there is flexible deformation in screw rod 20 under the effect of self gravitation and centrifugal force etc., first screw support element 10 is crushed on the inwall of machine barrel 30, screw rod 20 is played a supporting role, other screw element 22 can not with the contact internal walls of machine barrel 30, thus eliminate the wearing and tearing between screw rod 20 and machine barrel 30.
Fig. 2 describes the embodiment of a screw support element 10 of the present invention.Screw support element 10 is made up of two parts, comprises inner ring 11 and outer ring 12.Inner ring 11 passes through hexagon location and installation on screw mandrel 21, rotate with screw mandrel 21, the mounting means of inner ring 11 on mandrel 21 is identical with the mounting means of other screw element 22, comprise the modes such as polygon location, singly-bound, double bond, multikey, spline, the present embodiment will not enumerate.Outer ring 12 coordinates with the inwall of machine barrel 30, machine barrel 30 is provided with the structure that restriction outer ring 12 is rotated, thus outer ring 12 can not be rotated in machine barrel 30.The axial length H2 of outer ring 12 is less than the axial length H1 of inner ring 11, and inner ring 11 is mutually adjacent to the end face of other screw element 22 and is arranged on screw mandrel 21 in the same manner, and outer ring 12 does not contact with other screw element 22, as shown in Figure 1B.Relatively rotate between inner ring 11 and outer ring 12.Outer ring 12 is provided with fluid passage 12a, so that material passes through.
The outer ring 12 of screw support element 10 coordinates with machine barrel 30 inwall, machine barrel 30 is provided with the structure that restriction outer ring 12 is rotated, thus outer ring 12 can not be rotated in machine barrel 30.Particularly, the outer surface of machine barrel 30 inwall and outer ring 12 is provided with intermeshing structure, as shown in Figure 2, machine barrel 30 inwall is provided with position limiting structure 30a, the outer surface of outer ring 12 is provided with the structure 12b engaged with position limiting structure 30a, and Fig. 3 lists and be provided with the another kind of form engaging each other structure on the outer surface of machine barrel 30 inwall and outer ring 12.
Screw support element 10 is provided with fluid passage 10a, so that material passes through, as shown in Figure 4 A.The form that arranges of fluid passage can have multiple, and it is not limited to three kinds of concrete forms described below.
A kind of concrete form is: on outer ring 12, be provided with fluid passage 12a, Figure 2 shows that outer ring 12 is provided with the example of some closed fluid passages 12a, Fig. 4 B is depicted as the example that outer ring 12 outer surface is provided with some open fluid passage 12a, and Fig. 4 C is depicted as the example that outer ring 12 inner surface is provided with some open fluid passage 12a.The setting of this fluid passage 12a and easy to process.
Selectively, another kind of concrete form is: on inner ring 11, be provided with fluid passage 11a, and Fig. 4 D is depicted as the example that inner ring 11 is provided with some closed fluid passages 11a, and Fig. 4 E is depicted as the example that inner ring 11 outer surface is provided with some open fluid passage 11a.Material, by rotating with screw rod 20 during this fluid passage, has the shear-mixed effect perpendicular to flow direction to material when entering fluid passage and go out fluid passage.
Selectively, another concrete form is: on outer ring 12 and inner ring 11, be all provided with fluid passage, the combining form of fluid passage is the various forms of any combination of set fluid passage 11a on the various forms of set fluid passage 12a on outer ring 12 and inner ring 11, Fig. 4 A lists outer ring 12 outer surface and is provided with the combining form that some open fluid passage 12a and inner ring 11 are provided with some closed fluid passages 11a, and other combining form will not enumerate herein.This set method fluid passage is many, and distributed rendering is effective.
During double screw extruder work, screw rod 20 continuous rotation, material flows to head 30c direction continuously under the helical feed effect of screw rod 20, the fluid passage 10a of material set by from screw support element 10 flows through, and the continuous-flow of material can produce unidirectional axial compressive force to screw support element 10.Inner ring 11 is mutually adjacent to the end face of adjacent screws element 22 and is arranged on mandrel 21 in the same manner, and inner ring 11 relatively screw rod 20, by completely spacing, comprises axial and radial.Outer ring 12 can not rotate in machine barrel 30, and radial direction coordinates with machine barrel 30, plays a supporting role to screw rod 20.
Further, establish lubrication groove 12c in the both ends of the surface of outer ring 12, as shown in Figure 5, under fluid field pressure effect, be pushed to adjacent screw element 22 when outer ring 12 and produce with its end contact when rubbing, the material continued through in lubrication groove 12c produces lubrication.
Further, in order to the one direction axial compressive force that balanced fluid produces screw support element 10, improve the stability that screw support element 10 works, to outer ring 12 one direction axial limiting, spacing direction is identical with Flow of Goods and Materials direction, namely stops outer ring 12 to move axially with material.Realize can having multiple to the mode of outer ring 12 one direction axial limiting, it is not limited to two kinds of concrete forms described below.
A kind of concrete form is: as shown in Figure 6, the mating surface between the outer ring 12 of screw support element 10 and inner ring 11 is the face of cylinder, and the discharge end of inner ring 11 is provided with rib 11b, thus carries out axial limiting to outer ring 12.When outer ring 12 is pushed to discharge end under fluid field pressure effect, the rib 11b on inner ring 11 produces axial limiting effect to outer ring 12, eliminates the end contact of outer ring 12 and adjacent screws element 22.Further, the end face of outer ring 12 is provided with lubrication groove 12c, to relatively rotating lubricate between rib 11b set on outer ring 12 and inner ring 11 when fluid continues through lubrication groove 12c.
Selectively, another kind of concrete form is: as shown in Figure 7, mating surface between the outer ring 12 of screw support element 10 and inner ring 11 is taper seat, inner surface by outer ring 12 is set to taper seat 12d, the outer surface of inner ring 11 is set to taper seat 11c, and the tapering of taper seat 12d and 11c is equal, the diameter of outer ring 12 bigger diameter end is less than the diameter of inner ring 11 bigger diameter end, the diameter of outer ring 12 miner diameter end is greater than the diameter of inner ring 11 miner diameter end, outer ring 12 is pushed to the bigger diameter end of inner ring 11 under fluid field pressure effect, thus reality is to the axial limiting of outer ring 12.
Further, in order to improve the stability that screw support element 10 works further, make outer ring 12 under any circumstance (comprise in machine barrel 30 without material time) all can not move axially, spacing to outer ring 12 bi-directional axial.Realizing the mode spacing to outer ring 12 bi-directional axial can have multiple, and it is not limited to two kinds of concrete forms described below.
A kind of concrete form is: the part contacted with each other at inner ring 11 and outer ring 12 is provided with intermeshing structure, as shown in Figure 8 A and 8 B, inner ring 11 is established axially two-way rib 11d, outer ring 12 is established the structure 12e engaged with two-way rib 11d, both realize outer ring 12 bi-directional axial spacing after being assembled together.In order to make material be smoothly through gap between inner ring 11 and outer ring 12, can be the structure that curved surface smoothly transits by intermeshing for both contact portions vibrational power flow, as shown in Figure 8 C.Fig. 8 D lists inner ring 11 and outer ring 12 and to contact with each other the another kind of engaging structure of part, the part that inner ring 11 and outer ring 12 contact with each other is set to sphere, axial limiting can be carried out on the one hand to outer ring 12, screw support element 10 can with the flexural deformation automatic positoning of screw rod 20 to adapt to the deflection of screw rod 20 on the other hand, can prevent " the edge friction " of inner ring 11 and outer ring 12, to avoid the wearing and tearing of screw support element 10 end.The part contacted with each other due to inner ring 11 and outer ring 12 is provided with intermeshing structure, in order to successfully inner ring 11 and outer ring 12 are assembled together, opposite opened is arranged in outer ring 12, is that two parts 121 and 122 are assembled by connector 123 by outer ring 12 subdivision, as illustrated in fig. 8e.Further, in order to install location, the split surface that two parts 121 and 122 of outer ring 12 contact with each other is set to staged.
Selectively, another kind of concrete form is: as shown in Figure 9 A, mating surface between the outer ring 12 of screw support element 10 and inner ring 11 is taper seat, and inner surface is set to taper seat 12d, and inner ring 11 is made up of inner ring body 111 and the spacing back-up ring 112 be arranged on inner ring body 111.As shown in Figure 9 B, the outer surface of inner ring body 111 is provided with taper seat 111a, and its minor diameter part is provided with threaded portion 111b.As shown in Figure 9 C, spacing back-up ring 112 is provided with threaded portion 112b.On inner ring body 111, set threaded portion 111b matches with threaded portion 112b set on spacing back-up ring 112, on the outer surface of inner ring body 111, set taper seat 111a is equal with taper seat 12d tapering set by the inner surface of outer ring 12, the diameter of outer ring 12 bigger diameter end is less than the diameter of inner ring body 111 bigger diameter end, the diameter of outer ring 12 miner diameter end is greater than the diameter of inner ring body 111 miner diameter end, and spacing back-up ring 112 is installed on inner ring body 111 by threaded portion 112b.When outer ring 12 is pushed to inner ring body 111 bigger diameter end under fluid field pressure effect, the taper seat 111a of inner ring body 111, to outer ring 12 limited location effect, realizes the bi-directional axial of outer ring 12 spacing by taper seat fit structure and spacing back-up ring 112.By twisting spacing back-up ring 112, the fit clearance between outer ring 12 and inner ring body 111 can also be regulated, when being twisted toward the bigger diameter end of inner ring body 111 by spacing back-up ring 112, outer ring 12 is pushed to the bigger diameter end of inner ring body 111, the gap smaller between outer ring 12 and inner ring body 111; When being twisted toward the miner diameter end of inner ring body 111 by spacing back-up ring 112, outer ring 12 can be moved to the miner diameter end of inner ring body 112, and the gap between outer ring 12 and inner ring body 111 becomes large.Further, the end face that spacing back-up ring 112 contacts with outer ring 12 is provided with lubrication groove 112a, to relatively rotating lubricate between outer ring 12 and spacing back-up ring 112 when fluid continues through lubrication groove 112a.
Further, for the benefit of inner ring 11 and the lubrication of outer ring 12 mating surface, can establish some lubrication grooves at the inner surface of the outer surface of inner ring 11 or outer ring 12.To set lubrication groove at the outer surface of inner ring 11, be described.As shown in Figure 10 A, Figure 10 B and Figure 10 C, lubrication groove 11e can be straight trough, skewed slot or helicla flute, and skewed slot or spiral can be Right deviations, and also can be left-leaning, grooved and groove number not be limit.
Further, be detained for avoiding the gap location of material in outer ring 12 with machine barrel 30 inwall, at outer ring 12 outer surface mounting sealing device 13, according to the product type of twin-screw extrusion machined, the sealing device with suitable heat resistance, decay resistance and compressive property can be selected.Figure 11 lists a kind of structure of installing the screw support element 10 of two groups of sealing devices 13 at outer ring 12 outer surface.
Two screw rods 20 of a double screw extruder can install one or more screw support element 10 respectively, screw support element 10 on two screw rods 20 can with other screw element 22 independent assortment, set-up mode can have multiple.
A kind of concrete form is: screw support element 10 is crisscross arranged on two screw rods 20, as illustrated in fig. 12.Screw support element 10 supports a wherein screw rod 20 in axial a certain position, and has mass transport ability at another root screw rod 20 of axial same position, and this setup makes screw rod 20 have continual mass transport ability.As illustrated in fig. 12, at axial location A, screw support element 10 supports a wherein screw rod 20, and the screw element 22 on another root screw rod 20 has mass transport ability.
Selectively, another kind of concrete form is: screw support element 10 is symmetrical arranged on two screw rods 20, as shown in Figure 12 B.This setup makes the supporting form of two screw rods 20 identical, and structure is close with stressing conditions, coordinates to rotate more to balance.
It should be noted that, can according to actual needs, the combination that the screw support element 10 on a double screw extruder can be interlaced arrangement and be arranged symmetrically with, to realize the optimum of screw rod 20 support and mass transport, as indicated in fig. 12 c.
Above-mentioned screw support device can be applicable to all types of double screw extruder, comprises parallel type in the same way, parallel incorgruous type, engagement type, half engagement type, non-engagement type, conical parallel dual type, the incorgruous type of taper.
It should be noted that in addition, the screw support element 10 of above-mentioned different detailed description of the invention can be combined and be applied on same double screw extruder.In order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible Combination application mode.
In addition, the present invention also provides a kind of double screw extruder, this double screw extruder mainly comprises transmission system, charging system, extrusion system, heating and cooling system, control system, and wherein extrusion system is the core of double screw extruder, mainly comprises screw rod 20 and machine barrel 30.It is characterized in that, this double screw extruder have employed above-mentioned screw support device, supports one or more diverse locations of screw rod 20, thus eliminates the wearing and tearing between screw rod 20 and machine barrel 30, has following advantage.
There is the double screw extruder of this screw support device, eliminate the wearing and tearing between screw rod 20 and machine barrel 30, extend the service life of screw rod 20 and machine barrel 30, decrease downtime, reduce cost of equipment maintenance.
Have the double screw extruder of this screw support device, the draw ratio of screw rod 20 can do to obtain very large (being greater than 120).Big L/D ratio double screw extruder has two-layer advantage: one, and when screw rod 20 rotating speed is constant, big L/D ratio can bring the longer time of staying.The prolongation of the time of staying is conducive to the abundant reaction of storeroom in reactive extrursion process, brings higher reactivity and better product quality; Be conducive to swelling in aramid fiber gel spinning, ultrahigh molecular weight polyethylene gel spinning and PAN base carbon fiber protofilament gel spinning technical process and the unwrapping to macromolecular chain ball of string winding arrangement.Its two, when the time of staying is constant, screw rod 20 rotating speed can be improved, thus improve the output of double screw extruder; Simultaneously the high-rate of shear that brings of high rotating speed, is conducive to the mixing of material, is conducive to the raising of quality of item.
Have the double screw extruder of this screw support device, material is divided into multiply by multiple fluid passage 10a of described screw support element 10, also helps the distributed rendering to material.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement, all should be included within protection scope of the present invention.
Claims (18)
1. a screw support device for double screw extruder, is characterized in that, comprises screw support element (10), and described screw support element (10) is arranged on the mandrel (21) of screw rod (20), and described screw support element (10) comprising:
Inner ring (11), is arranged on described screw mandrel (21), rotates with described screw mandrel (21);
Outer ring (12), coordinates with the inwall of machine barrel (30);
Described machine barrel (30) is provided with the structure that the described outer ring of restriction (12) is rotated;
The axial length (H2) of described outer ring (12) is less than the axial length (H1) of described inner ring (11);
The gap (C1) of described outer ring (12) in radial directions and between described machine barrel (30) inwall is less than the gap (C2) between the spiral shell rib (22) of described screw rod (20) and described machine barrel (30) inwall.
2. screw support device according to claim 1, it is characterized in that, described machine barrel (30) is provided with restriction described outer ring (12) structure of rotating is, the outer surface of described machine barrel (30) inwall and described outer ring (12) is provided with intermeshing structure.
3. screw support device according to claim 1, is characterized in that, described screw support element (10) is provided with fluid passage (10a).
4. screw support device according to claim 3, is characterized in that, described fluid passage (10a) is arranged on described inner ring (11) and (or) described outer ring (12).
5. screw support device according to claim 3, is characterized in that, is provided with lubrication groove (12c) in the both ends of the surface of described outer ring (12).
6. screw support device according to claim 3, is characterized in that, to described outer ring (12) one direction axial limiting, spacing direction is for moving with Flow of Goods and Materials direction the outer ring (12) described in prevention.
7. screw support device according to claim 6, is characterized in that, to described outer ring (12) one direction axially
Spacing mode is, arranges rib (11b) at the discharge end of described inner ring (11);
Or the mating surface between described outer ring (12) and described inner ring (11) is taper seat, namely the inner surface of described outer ring (12) is taper seat (12d), the outer surface of described inner ring (11) is taper seat (11c), and both taperings are equal, the diameter of described outer ring (12) bigger diameter end is less than the diameter of described inner ring (11) bigger diameter end, and the diameter of described outer ring (12) miner diameter end is greater than the diameter of described inner ring (11) miner diameter end.
8. screw support device according to claim 3, is characterized in that, spacing to described outer ring (12) bi-directional axial.
9. screw support device according to claim 8, it is characterized in that, the mode spacing to described outer ring (12) bi-directional axial is, the part contacted with each other at described inner ring (11) and described outer ring (12) is provided with intermeshing structure, opposite opened is arranged in described outer ring (12), is two parts (121 by outer ring (12) subdivision; 122) be assembled by connector (123).
10. screw support device according to claim 9, is characterized in that, described inner ring (11) and the intermeshing vibrational power flow of described outer ring (12) contact portion are the structure that curved surface smoothly transits;
Or described inner ring (11) and the intermeshing vibrational power flow of described outer ring (12) contact portion are mating spherical surfaces structure.
11. screw support devices according to claim 9, described outer ring (12) subdivision is two parts (121; 122), it is characterized in that, described two parts (121; 122) split surface contacted with each other is set to staged.
12. screw support devices according to claim 8, it is characterized in that, the mode spacing to described outer ring (12) bi-directional axial is, mating surface between described outer ring (12) and described inner ring (11) is taper seat, the inner surface of described outer ring (12) is set to taper seat (12d), described inner ring (11) is combining structure, comprise inner ring body (111) and be arranged on the spacing back-up ring (112) on described inner ring body (111), the outer surface of described inner ring body (111) is set to taper seat (111a), and it is equal with the tapering of taper seat (12d) set by described outer ring (12) inner surface, the diameter of described outer ring (12) bigger diameter end is less than the diameter of described inner ring body (111) bigger diameter end, the diameter of described outer ring (12) miner diameter end is greater than the diameter of described inner ring body (111) miner diameter end, described spacing back-up ring (112) is arranged on the miner diameter end of described inner ring body (111).
13. screw support devices according to claim 12, is characterized in that, the end face that described spacing back-up ring (112) contacts with described outer ring (12) is provided with lubrication groove (112a).
14. screw support devices according to claim 3, is characterized in that, are provided with lubrication groove at the outer surface of described inner ring (11) or the inner surface of described outer ring (12).
15. screw support devices according to claim 3, is characterized in that, at the outer surface mounting sealing device (13) that described outer ring (12) coordinate with described machine barrel (30) inwall.
16., according to the screw support device in claim 1 to 15 described in any one, is characterized in that, described screw support device comprises one or more described screw support element (10).
17. screw support devices according to claim 16, is characterized in that, the arrange form of described screw support element (10) on two screw rods (20) for be crisscross arranged or (with) be symmetrical arranged.
18. 1 kinds of double screw extruders, is characterized in that, have the screw support device according to any one of claim 1 to 17.
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| CN201510537253.7A CN105109015B (en) | 2015-08-28 | 2015-08-28 | A kind of screw support device and the double screw extruder with the device |
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| CN201510537253.7A CN105109015B (en) | 2015-08-28 | 2015-08-28 | A kind of screw support device and the double screw extruder with the device |
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| CN105109015A true CN105109015A (en) | 2015-12-02 |
| CN105109015B CN105109015B (en) | 2017-11-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106955641A (en) * | 2017-04-22 | 2017-07-18 | 杨松 | One kind granulates special prestressing force extrusion screw rod using solid waste |
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| CN105034318A (en) * | 2015-08-27 | 2015-11-11 | 湖南匡为科技有限公司 | Screw supporting device and double-screw extruding machine with device |
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| US3530534A (en) * | 1968-01-29 | 1970-09-29 | Midland Ross Corp | Extruder with ball and screw dispersing mechanism |
| CN85203281U (en) * | 1985-07-22 | 1986-12-31 | 许定康 | Plastic extruder with great l/d ratio |
| US20030007709A1 (en) * | 2001-07-05 | 2003-01-09 | Norbert Schweigler | Internal bearing for screw machines |
| CN2579643Y (en) * | 2002-11-22 | 2003-10-15 | 夏桂玲 | Multiple section pin type single screw plastic extruder |
| CN2670090Y (en) * | 2004-01-07 | 2005-01-12 | 上海鲍曼泵业有限公司 | Double-screw colloidal comminutor |
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| CN106955641A (en) * | 2017-04-22 | 2017-07-18 | 杨松 | One kind granulates special prestressing force extrusion screw rod using solid waste |
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| CN105109015B (en) | 2017-11-10 |
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