CN105034318A - Screw supporting device and double-screw extruding machine with device - Google Patents
Screw supporting device and double-screw extruding machine with device Download PDFInfo
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- CN105034318A CN105034318A CN201510535325.4A CN201510535325A CN105034318A CN 105034318 A CN105034318 A CN 105034318A CN 201510535325 A CN201510535325 A CN 201510535325A CN 105034318 A CN105034318 A CN 105034318A
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- outer ring
- screw
- screw support
- ring
- rolling element
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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
Abstract
The invention provides a screw supporting device and a double-screw extruding machine with the device. The screw supporting device comprises one or more screw supporting elements. The screw supporting elements are installed on a screw mandrel. Each screw supporting element comprises an inner ring, an outer ring and rolling bodies, wherein the number of the rolling bodies is larger than or equal to three. A structure for limiting rotation of the outer rings is arranged on a machine cylinder. The axial length of the outer rings is smaller than that of the inner rings, and the gaps between the outer rings and the inner wall of the machine cylinder in the radial direction are smaller than the gaps between the screw edges of screws and the inner wall of the machine cylinder. The screw supporting elements are provided with structures enabling certain distances to be maintained between the rolling bodies and limiting axial movement of the rolling bodies relative to the inner rings or the outer rings. The screw supporting elements are arranged on the two screws in a staggered manner or/and a symmetrical manner. According to the double-screw extruding machine with the screw supporting device, one or more positions of the screws are supported, and thus the abrasion between the screws and the machine cylinder 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 three parts: one is inner ring, and inner ring is arranged on the mandrel of screw rod, rotates with screw rod; Two is outer rings, and outer ring coordinates with the inwall of described machine barrel; Three is rolling elements, rolling element is between described inner ring and described outer ring, realize relatively rotating of described inner ring and described outer ring, rolling element can be spheroid, cylinder, convex spherical roller, needle roller etc., wherein the structure of cylinder, convex spherical roller, needle roller is similar, only be described for spheroid and cylinder below, for making to keep stable, quantity >=3 of described rolling element during described screw support element manipulation.
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.
Described screw support element is provided with and makes to maintain a certain distance between described rolling element and limit the structure that the relatively described inner ring of described rolling element or described outer ring move axially, and this version can have multiple.
Preferably, the inner surface of described outer ring is provided with the spacing pit coordinated with described rolling element, if rolling element is that spheroid is then provided with spherical limiting pit, rolling element is that cylinder is then provided with the spacing pit of cylindrical shape, have position-limiting action to described rolling element, the quantity of described spacing pit is equal with the quantity of described rolling element.
Selectively, the outer surface of described inner ring is provided with the spacing pit coordinated with described rolling element, if rolling element is that spheroid is then provided with spherical limiting pit, rolling element is that cylinder is then provided with the spacing pit of cylindrical shape, have position-limiting action to described rolling element, the quantity of described spacing pit is equal with the quantity of described rolling element.
Selectively, described screw support element also comprises retainer, described retainer partly wraps up described rolling element, and move with described rolling element, make to maintain a certain distance between described rolling element, arrange circumferential groove raceway at the outer surface of described inner ring or the inner surface of described outer ring, described circumferential groove raceway limits moving axially of described rolling element.
During double screw extruder work, screw rod continuous rotation, material flows to heading continuously under the helical feed effect of screw rod, material flows through from the described inner ring of described screw support element, space between described outer ring and described rolling element, 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.Maintain a certain distance between described rolling element and be limited in the axial direction on described inner ring or described outer ring.Described outer ring radial direction coordinates with described machine barrel, can not rotate, play a supporting role to described screw rod in described machine barrel.
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, one-sided on described inner ring or described outer ring rib is set, one side end face of the adjacent described rolling element of described rib, contact with the outer surface of described rolling element, if described rolling element is spheroid, then the cross section of described rib is circular arc, if described rolling element is cylinder, then the cross section of described rib is boss shape.When described outer ring is provided with the spacing pit or circumferential groove raceway that coordinate with described rolling element, one-sided on described inner ring rib is set, the direction that described rib comes towards fluid, stop that described rolling element moves axially with material, and described rolling element is in the spacing pit being axially limited in described outer ring or circumferential groove raceway, thus achieve described outer ring one direction axial limiting; When described inner ring is provided with the spacing pit or circumferential groove raceway that coordinate with described rolling element, one-sided on described outer ring rib is set, the described rib direction that fluid is next dorsad, stops that described outer ring moves axially with material, realizes described outer ring one direction axial limiting from face.
Selectively, described outer ring is made up of outer ring body, spacing back-up ring and connector, and described spacing back-up ring is arranged on the body of described outer ring by described connector.Described inner ring is provided with shoulder block and contacts with described spacing back-up ring, the direction that described shoulder block comes towards fluid, stops that described spacing back-up ring moves axially with material, thus achieves described outer ring one direction axial limiting.Described spacing back-up ring is provided with fluid passage, and fluid can continue through described fluid passage.Further, described spacing back-up ring is also provided with lubrication groove, particularly, described lubrication groove is located at the position that described spacing back-up ring contact with shoulder block set on described inner ring, to relatively rotating lubricate between shoulder block set by described spacing back-up ring and described inner ring when fluid continues through described lubrication groove.
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, namely described screw support element is provided with and makes to maintain a certain distance between described rolling element and limit the structure that the relatively described inner ring of described rolling element and described outer ring move axially.Realizing the mode spacing to described outer ring bi-directional axial can have multiple.
Preferably, the inner surface of described outer ring is provided with the spacing pit coordinated with described rolling element, and the quantity of described spacing pit is equal with the quantity of described rolling element, and the outer surface of described inner ring is provided with circumferential groove raceway; Or on the outer surface of described inner ring, being provided with the spacing pit coordinated with described rolling element, the quantity of described spacing pit is equal with the quantity of described rolling element, and the inner surface of described outer ring is provided with circumferential groove raceway.In order to be assembled up smoothly by described screw support element, described outer ring being set to opposite opened, is that two parts are assembled by connector by described outer ring subdivision; Or described inner ring is combining structure, comprise inner ring body and be arranged on the spacing back-up ring on described inner ring body, described inner ring body is provided with demifacet circumferential groove raceway or the spacing pit of demifacet, described spacing back-up ring is also provided with demifacet circumferential groove raceway or the spacing pit of demifacet, after described inner ring body and described spacing back-up ring are assembled together, in the middle of described inner ring, form circumferential groove raceway or spacing pit.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, described screw support element also comprises retainer, described retainer partly wraps up described rolling element, and move with described rolling element, make to maintain a certain distance between described rolling element, be provided with circumferential groove raceway at the outer surface of described inner ring and the inner surface of described outer ring, described circumferential groove raceway limits moving axially of described rolling element.
Further, as as described in rolling element be cylinder, lubrication groove can be established, to relatively rotating lubricate between the both ends of the surface of spacing pit set in rolling element both ends of the surface and described inner ring or described outer ring or the both ends of the surface of circumferential groove raceway or rib at rolling element two ends.
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, Fig. 3 and Fig. 4 are the structural representation of screw support element;
Fig. 5 A and Fig. 5 B is the outer ring structure schematic diagram that inner surface is provided with spacing pit;
Fig. 5 C and Fig. 5 D is the inner ring structure schematic diagram that outer surface is provided with spacing pit;
Fig. 5 E has retainer and inner ring outer surface is provided with the screw support component structure schematic diagram of circumferential groove raceway;
Fig. 5 F has retainer and inner surface is provided with the screw support component structure schematic diagram of circumferential groove raceway;
Fig. 6 A, Fig. 6 B, Fig. 6 C and Fig. 6 D are one-sided structural representation and the partial schematic diagram being provided with the screw support element of rib of inner ring;
Fig. 6 E and Fig. 6 F is one-sided structural representation and the partial schematic diagram being provided with the screw support element of rib in outer ring;
Fig. 7 A and Fig. 7 B is the structural representation of the screw support element of outer astragal limiting block circle;
Fig. 7 C is the structural representation of the spacing back-up ring be arranged on the body of outer ring;
Fig. 8 A is that inner surface is provided with spacing pit and inner ring outer surface is provided with circumferential groove raceway and has the structural representation of the screw support element of split outer race;
Fig. 8 B is that inner ring outer surface is provided with spacing pit and inner surface is provided with circumferential groove raceway and has the structural representation of the screw support element of split outer race;
Fig. 8 C is the structural representation of split outer race;
Fig. 8 D and Fig. 8 E is the structural representation of the screw support element with combined inner ring;
Fig. 9 has retainer and inner ring outer surface and inner surface are equipped with the screw support component structure schematic diagram of circumferential groove raceway;
Figure 10 is the structural representation that both ends of the surface are provided with the cylinder rolling element of 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 screw support element arrange the structural representation of 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 of the present invention.Screw support element 10 is made up of three parts, comprises inner ring 11, outer ring 12 and rolling element 13.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.Rolling element 13 can be spheroid, cylinder, convex spherical roller, needle roller etc., and wherein the structure of cylinder, convex spherical roller, needle roller is similar, is only described for spheroid and cylinder below.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.Material flows through from inner ring 11, space 10a between outer ring 12 and rolling element 13 under pressure, and meanwhile, the material continued through is to relatively rotating lubricate between rolling element 13 and inner ring 11, outer ring 12.
Keep stable when working for making screw support element 10, quantity >=3 of the rolling element 13 that single screw support element 10 comprises, Fig. 3 to be rolling element quantity be embodiment of 3.
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 12a engaged with position limiting structure 30a, and Fig. 4 lists 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 and makes to maintain a certain distance between rolling element 13 and limit the rolling element 13 relatively structure that moves axially of inner ring 11 or outer ring 12, and this version can have multiple, and it is not limited to three kinds of concrete forms described below.
A kind of concrete form is: the inner surface of outer ring 12 is provided with the spacing pit 12b coordinated with rolling element 13, as rolling element 13 is then set to spherical limiting pit for spheroid, as shown in Figure 5A, rolling element 13 is then set to the spacing pit of cylindrical shape for cylinder, as shown in Figure 5 B.Spacing pit 12b has position-limiting action to rolling element 13, and rolling element 13 can only rotation in spacing pit 12b, and keeps motionless with the relative position of outer ring 12, and on the inner surface of outer ring 12, the quantity of set spacing pit 12b is equal with the quantity of rolling element 13.During double screw extruder work, screw rod 20 rotates, inner ring 11 rotates with mandrel 21, outer ring 12 can not rotate in machine barrel 30, rolling element 13 drives to issue to be conigenous in the frictional force of inner ring 11 and turns, owing to being limited in spacing pit 12b set on outer ring 12, keep motionless with outer ring 12 relative position.
Selectively, another kind of concrete form is: the outer surface of inner ring 11 is provided with the spacing pit 11a coordinated with rolling element 13, as rolling element 13 is then set to spherical limiting pit for spheroid, as shown in Figure 5 C, rolling element 13 is then set to the spacing pit of cylindrical shape for cylinder, as shown in Figure 5 D.Spacing pit 11a has position-limiting action to rolling element 13, and rolling element 13 can only rotation in spacing pit 11a, and keeps motionless with the relative position of inner ring 11, and on inner ring 11 inner surface, the quantity of set spacing pit 11a is equal with the quantity of rolling element 13.During double screw extruder work, screw rod 20 rotates, and inner ring 11 rotates with mandrel 21, and outer ring 12 can not rotate in machine barrel 30, and rolling element 13 is limited in spacing pit 11a, rotates, as shown in Figure 4 together with inner ring 11.
Selectively, another concrete form is: screw support element 10 also comprises retainer 14, retainer 14 partly wraps up rolling element 13, and move with rolling element 13, make to maintain a certain distance between rolling element 13, circumferential groove raceway is set at the outer surface of inner ring 11 or the inner surface of outer ring 12, moving axially of circumferential groove raceway restriction rolling element 13.Fig. 5 E lists to have retainer 14 and list at screw support element 10, Fig. 5 F that the outer surface of inner ring 11 arranges circumferential groove raceway 11b has retainer 14 and the screw support element 10 arranging circumferential groove raceway 12c at the inner surface of outer ring 12.
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, material flows through from the inner ring 11 of screw support element 10, space 10a between outer ring 12 and rolling element 13, 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.Maintain a certain distance between rolling element 13 and be limited in the axial direction on inner ring 11 or outer ring 12.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, 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: one-sidedly on inner ring 11 establish rib 11c, or one-sidedly on outer ring 12 establish rib 12d, described rib 11c(12d) side end face of adjacent rolling element 13, match with the outer surface of rolling element 13, if rolling element 13 is spheroid, then rib 11c(12d) cross section be circular arc, Fig. 6 A and Fig. 6 B to list on inner ring 11 one-sided cross section of setting as the example of the rib 11c of circular arc, Fig. 6 B is the partial enlarged view of Fig. 6 A, if rolling element 13 is cylinder, then rib 11c(12d) cross section be boss shape, Fig. 6 C and Fig. 6 D to list on inner ring 11 one-sided cross section of setting as the example of the rib 11c of boss shape, Fig. 6 D is the partial enlarged view of Fig. 6 C.When outer ring 12 is provided with the spacing pit 12b or circumferential groove raceway 12c that coordinate with rolling element 13, one-sided on inner ring 11 rib 11c is set, the direction that rib 11c comes towards fluid, stop that rolling element 13 moves axially with material, and rolling element 13 is in the spacing pit 12b being axially limited in outer ring 12 or circumferential groove raceway 12c, thus achieve outer ring 12 one direction axial limiting, as shown in Fig. 6 A and Fig. 6 C; When inner ring 11 is provided with the spacing pit 11a or circumferential groove raceway 11b that coordinate with rolling element 13, one-sided on outer ring 12 rib 12d is set, the rib 12d direction that fluid is next dorsad, stop that outer ring 12 moves axially with material, realize outer ring 12 one direction axial limiting from face, as shown in Fig. 6 E and Fig. 6 F, Fig. 6 F is the partial enlarged view of Fig. 6 E.
Selectively, another kind of concrete form is: as shown in figures 7 a and 7b, and outer ring 12 is made up of outer ring body 121, spacing back-up ring 122 and connector 123, and spacing back-up ring 122 is arranged on outer ring body 121 by connector 123.As seen in figure 7 c, spacing back-up ring 122 is established the installing hole 122a of uniform a week, spacing back-up ring 122 is arranged on outer ring body 121 by installing hole 122a.Spacing back-up ring 122 is also provided with positive stop lug boss 122b, at the homonymy of inner ring 11, shoulder block 11d is set, positive stop lug boss 122b is close to set shoulder block 11d on inner ring 11, the direction that shoulder block 11d comes towards fluid, stop that spacing back-up ring 122 moves axially with material, thus achieve outer ring 12 one direction axial limiting.Spacing back-up ring 122 is also provided with fluid passage 122c, and material can continue through fluid passage 122c.Further, spacing back-up ring 122 is also provided with lubrication groove 122d, particularly, lubrication groove 122d is located on positive stop lug boss 122b, to relatively rotating lubricate between shoulder block 11d set on positive stop lug boss 122b and inner ring 11 when fluid continues through lubrication groove 122d.During double screw extruder work, the inner ring 11 of screw support element 10 rotates with mandrel 21, the fluid passage 122c set from spacing back-up ring 122 of material enters inner ring 11, space 10a between outer ring 12 and rolling element 13 continuing through, due to the axial compressive force of fluid, on spacing back-up ring 122, set positive stop lug boss 122b contacts with shoulder block 11d set on inner ring 11 all the time, and restriction outer ring 12 produces and moves axially; Simultaneously on spacing back-up ring 122, be provided with lubrication groove 122d, to relatively rotating lubricate between shoulder block 11d set on positive stop lug boss 122b and inner ring 11 when fluid continues through lubrication groove 122d.
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, namely screw support element 10 is provided with and makes to maintain a certain distance between rolling element 13 and limit the rolling element 13 relatively structure that moves axially of inner ring 11 and outer ring 12.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 inner surface of outer ring 12 is provided with the spacing pit 12b coordinated with rolling element 13, and the quantity of spacing pit 12b is equal with the quantity of rolling element 13, and the outer surface of inner ring 11 is provided with circumferential groove raceway 11b, as shown in Figure 8 A.Or on the outer surface of inner ring 11, being provided with the spacing pit 11a coordinated with rolling element 13, the quantity of spacing pit 11a is equal with the quantity of rolling element 13, and the inner surface of outer ring 12 is provided with circumferential groove raceway 12c, as shown in Figure 8 B.In order to be assembled up smoothly by screw support element 10, outer ring 12 is set to opposite opened, is namely assembled by connector 126 by 124 and 125 two parts, for preventing material lagging, then blocking 127 on cover on connector 126, as shown in Figure 8 C.Further, in order to install location, the split surface that two parts 124 and 125 of outer ring 12 contact with each other is set to staged.In order to screw support element 10 is assembled up smoothly, inner ring 11 can also be set to combining structure, the spacing back-up ring 112 comprising inner ring body 111 and be arranged on inner ring body 111, on inner ring body, 111 are provided with demifacet circumferential groove raceway 111b or the spacing pit 111a of demifacet, spacing back-up ring 112 is also provided with demifacet circumferential groove raceway 112b or the spacing pit 111a of demifacet, inner ring body 111 and spacing back-up ring 112 are assembled together by holding screw 113, circumferential groove raceway 11b or spacing pit 11a is formed, as shown in Fig. 8 D and Fig. 8 E in the middle of inner ring 11.
Selectively, another kind of concrete form is: screw support element 10 also comprises retainer 14, retainer 14 partly wraps up rolling element 13, and move with rolling element 13, make to maintain a certain distance between rolling element 13, be provided with circumferential groove raceway 11b at the outer surface of inner ring 11, the inner surface of outer ring 12 is provided with circumferential groove raceway 12c, circumferential groove raceway 11b(12c) limit moving axially of rolling element 13, as shown in Figure 9.
Further, if rolling element 13 is cylinder, lubrication groove 13a can be established at rolling element 13 two ends, as shown in Figure 10, during double screw extruder work, fluid continues through the two ends lubrication groove 13a of rolling element 13, the spacing pit 11a(12b to set in rolling element 13 both ends of the surface and inner ring 11 or outer ring 12) both ends of the surface or circumferential groove raceway 11b(12c) both ends of the surface or rib 11c(12d) between relatively rotate lubricate.
Further, be detained for avoiding the gap location of material in outer ring 12 with machine barrel 30 inwall, the outer surface mounting sealing device 15 that can coordinate with machine barrel 30 inwall in outer ring 12, according to the product type of twin-screw extrusion machined, select the sealing device with suitable heat resistance, decay resistance and compressive property.Figure 11 lists a kind of structure of installing the screw support element 10 of two groups of sealing devices 15 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 passages of described screw support element 10 (inner ring 11, space 10a) between outer ring 12 and rolling element 13, 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);
Rolling element (13), is positioned between inner ring (11) and outer ring (12);
Wherein, quantity >=3 of described rolling element (13);
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 (22a) of described screw rod (20) and described machine barrel (30) inwall;
Described screw support element (10) is provided with and makes to maintain a certain distance between described rolling element (13) and limit the structure that the relatively described inner ring (11) of described rolling element (13) or described outer ring (12) move axially.
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, it is characterized in that, described screw support element (10) is provided with and makes to maintain a certain distance between described rolling element (13) and limit the structure that the relatively described inner ring (11) of described rolling element (13) or described outer ring (12) move axially is that the outer surface of described inner ring (11) or the inner surface of described outer ring (12) are provided with the spacing pit (11a coordinated with described rolling element (13); 12b), described spacing pit (11a; Quantity 12b) is equal with the quantity of rolling element (13);
Or described screw support element (10) also comprises retainer (14), be provided with circumferential groove raceway (11b at described inner ring (11) outer surface or described outer ring (12) inner surface; 12c).
4. screw support device according to claim 1, 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.
5. screw support device according to claim 4, it is characterized in that, to the mode of described outer ring (12) one direction axial limiting be, one-sided rib (11c) is set described inner ring (11) is upper, one side end face of the adjacent described rolling element (13) of described rib (11c), towards the direction that fluid comes;
Or one-sided rib (12d) is set, a side end face of the adjacent described rolling element (13) of described rib (12d) described outer ring (12) are upper, the direction come of fluid dorsad.
6. screw support device according to claim 4, it is characterized in that, to the mode of described outer ring (12) one direction axial limiting be, described outer ring (12) is by outer ring body (121), spacing back-up ring (122) and connector (123) composition, described spacing back-up ring (122) is arranged on described outer ring body (121) by described connector (123), described inner ring (11) is provided with shoulder block (11d) and contacts with described spacing back-up ring (122), the direction that described shoulder block (11d) comes towards fluid, described spacing back-up ring (122) is provided with fluid passage (122c).
7. screw support device according to claim 6, it is characterized in that, described spacing back-up ring (122) is provided with lubrication groove (122d), and described lubrication groove (122d) is located at the position (122b) that described spacing back-up ring (122) contacts with the upper set shoulder block (11d) of described inner ring (11).
8. screw support device according to claim 1, it is characterized in that, described screw support element (10) is provided with and makes to maintain a certain distance between described rolling element (13) and limit the structure that the relatively described inner ring (11) of described rolling element (13) and described outer ring (12) move axially.
9. screw support device according to claim 8, it is characterized in that, described screw support element (10) is provided with to make to maintain a certain distance between described rolling element (13) and limit the structure that the relatively described inner ring (11) of described rolling element (13) and described outer ring (12) move axially, the inner surface of described outer ring (12) is provided with the spacing pit (12b) coordinated with described rolling element (13), the quantity of described spacing pit (12b) is equal with the quantity of described rolling element (13), the outer surface of described inner ring (11) is provided with circumferential groove raceway (11b),
Or the outer surface of described inner ring (11) is provided with the spacing pit (11a) coordinated with described rolling element (13), the quantity of described spacing pit (11a) is equal with the quantity of described rolling element (13), and the inner surface of described outer ring (12) is provided with circumferential groove raceway (12c).
10. screw support device according to claim 9, is characterized in that, described outer ring (12) are set to opposite opened, is two parts (124 by described outer ring (12) subdivision; 125) be assembled by connector (126).
11. screw support devices according to claim 10, described outer ring (12) subdivision is two parts (124; 125), it is characterized in that, described two parts (124; 125) split surface contacted with each other is set to staged.
12. screw support devices according to claim 9, it is characterized in that, 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), described inner ring body (111) is provided with demifacet circumferential groove raceway (111b) or the spacing pit of demifacet (111a), described spacing back-up ring (112) is also provided with demifacet circumferential groove raceway (112b) or the spacing pit of demifacet (112a), after described inner ring body (111) and described spacing back-up ring (112) are assembled together, circumferential groove raceway (11b) or spacing pit (11a) is formed in the middle of described inner ring.
13. screw support devices according to claim 8, it is characterized in that, described screw support element (10) is provided with to make to maintain a certain distance between described rolling element (13) and limit the structure that the relatively described inner ring (11) of described rolling element (13) and described outer ring (12) move axially, described screw support element (10) also comprises retainer (14), is provided with circumferential groove raceway (11b at described inner ring (11) outer surface and described outer ring (12) inner surface; 12c).
14. screw support devices according to claim 1, is characterized in that, described rolling element (13) is cylinder, and described cylinder two ends are provided with lubrication groove (13a).
15. screw support devices according to claim 1, is characterized in that, at the outer surface mounting sealing device (15) 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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| CN201510535325.4A CN105034318B (en) | 2015-08-27 | 2015-08-27 | A kind of screw support device and the double screw extruder with the device |
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| CN201510535325.4A CN105034318B (en) | 2015-08-27 | 2015-08-27 | A kind of screw support device and the double screw extruder with the device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105109015A (en) * | 2015-08-28 | 2015-12-02 | 湖南匡为科技有限公司 | Screw support device and twin-screw extruder with same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3530534A (en) * | 1968-01-29 | 1970-09-29 | Midland Ross Corp | Extruder with ball and screw dispersing mechanism |
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2015
- 2015-08-27 CN CN201510535325.4A patent/CN105034318B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3530534A (en) * | 1968-01-29 | 1970-09-29 | Midland Ross Corp | Extruder with ball and screw dispersing mechanism |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105109015A (en) * | 2015-08-28 | 2015-12-02 | 湖南匡为科技有限公司 | Screw support device and twin-screw extruder with same |
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