CN117734142A - Screw with parametrizable flow passage section - Google Patents
Screw with parametrizable flow passage section Download PDFInfo
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- CN117734142A CN117734142A CN202311611110.7A CN202311611110A CN117734142A CN 117734142 A CN117734142 A CN 117734142A CN 202311611110 A CN202311611110 A CN 202311611110A CN 117734142 A CN117734142 A CN 117734142A
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- 239000000463 material Substances 0.000 claims abstract description 49
- 238000002844 melting Methods 0.000 claims abstract description 22
- 230000008018 melting Effects 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 19
- 230000000903 blocking effect Effects 0.000 claims abstract description 15
- 230000002093 peripheral effect Effects 0.000 claims abstract description 5
- 239000007787 solid Substances 0.000 claims description 33
- 239000011295 pitch Substances 0.000 claims description 15
- 230000000295 complement effect Effects 0.000 claims description 9
- 239000000155 melt Substances 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 16
- 238000010008 shearing Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 230000010006 flight Effects 0.000 description 4
- 238000000926 separation method Methods 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010297 mechanical methods and process Methods 0.000 description 2
- 230000005226 mechanical processes and functions Effects 0.000 description 2
- 239000002861 polymer material Substances 0.000 description 2
- 230000000750 progressive effect Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000289 melt material Substances 0.000 description 1
- 238000010137 moulding (plastic) Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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Abstract
The utility model discloses a screw with a parametrizable flow passage section, which comprises a screw body, screw edges and a flow dividing mixing element; wherein, the parameterized design is carried out on part or all of the sections of the flow channels along the direction of the spiral grooves: the width of the spiral groove is increased, the depth of the spiral groove is reduced, and the depth of the spiral groove is increased, so that mass transfer exists in the width direction of the spiral groove and mass transfer exists in the depth direction of the spiral groove at the same time when mass transfer exists in each flow passage section in the width direction of the spiral groove; part or all of the flow channels gradually converge along the linear change rule of the direction of the spiral grooves, so that the materials are compacted continuously while being sheared and stretched; the flow dividing and mixing element comprises a plurality of flow blocking blocks arranged on the peripheral surface of the rear section of the screw body, and the flow blocking blocks are arranged in a spiral array, so that the material flow passes through the flow dividing and mixing blocks every time the material flow passes through one row of flow blocking blocks. The utility model can solve the problem of insufficient mixing in the melting and plasticizing process of materials and the problem of steam drum in the extrusion melt.
Description
Technical Field
The utility model relates to the technical field of polymer material processing, in particular to a screw with a parametrizable flow passage section.
Background
The screw is a core component of a high polymer material forming and processing machine, mainly plays roles in conveying and plasticizing materials in the forming and processing process, has decisive influence on the production efficiency of the processing process and the quality of a formed product to a reasonable degree, and has a plurality of novel screws with high yield and low energy consumption still have the defects of accumulating materials, wrapping gas and the like through years of practical exploration.
The screw structure type can be divided into a conventional screw and a novel screw, wherein the conventional screw generally adopts a three-section full-thread structure, the thread structure mainly adopts a constant-pitch groove depth-changing or variable-pitch groove depth-changing structure to realize material compression, and the defects of slow material melting, large pressure fluctuation, poor mixing effect, insufficient plasticization and the like in the extrusion process are easily caused due to the structural characteristics of the conventional screw. Aiming at the problems of the conventional screw, novel screws such as a separation type screw, a barrier type screw, a split flow type screw and a variable flow channel screw are developed and have certain actual effects, wherein the separation type screw, the barrier type screw and the split flow type screw are characterized in that solid-melt separation structures are designed at different sections of the screw to separate solids from melt so as to prevent plasticization defects, and meanwhile, the materials are mainly subjected to shearing and plasticizing so as to undergo longer thermal mechanical processes. The wavy screw is a representative structure of a variable flow channel screw, and the material is reduced in thermal mechanical process by changing the flow channel structure designs such as the number of wave grooves, the cross-sectional shape of the wave grooves and the like, so that bubbles, namely a gas wrapping phenomenon, exist in the extrudate melt easily due to unreasonable flow channel designs.
For example, a double progressive twin flighted screw, refer to patent document utility model name: double gradual change double wave screw rod, patent publication No.: CN1036922a, the whole section of the screw adopts an eccentric structure to change the depth and amplitude of the screw groove from large to small and from small to large, and the width of the screw groove is unchanged, so that the plasticizing and mixing of the materials under the shearing and stretching actions are realized. However, the double progressive screws also have the disadvantage of: the eccentric structure realizes shearing action on materials and simultaneously has stretching action to achieve better melting plasticizing effect, and mass transfer only occurs along the depth direction of the spiral groove on the section of each spiral groove in the process of moving the materials along the direction of the spiral groove due to the fact that the width of the spiral groove is unchanged, so that the mixing effect is insufficient.
For example, a deepened twin-wave screw, refer to patent literature utility model names: wave screw for injection molding machine, patent publication No.: CN203726779U, the melting section adopts eccentric structure, the solid section and the metering section become pitch and become the helicla flute structure, and the conical runner realizes that the screw rod has shearing action and stretching effect to melt the plasticization to the material. Also, the deepened twin-wave screw suffers from the following disadvantages: the melting section adopts an eccentric structure design to realize the shearing and stretching effects on materials, and because the solid section and the metering section adopt variable pitches, namely the flow passage section along the direction of the spiral groove is in step change, the problem of accumulation of materials is easy to occur due to abrupt change of the section, and the eccentric structure design also has the condition of wrapping gas.
For example, a single wave screw, refer to patent literature utility model names: plastic molding screw, patent publication No.: CN201685441U, the screw edge of the screw melting section is of cambered surface structure, the depth of the screw groove is unchanged, the width of the screw groove is periodically changed along the axial direction to realize shearing and stretching effects, and the metering section adopts a pin structure to realize plasticizing and mixing of materials. The defects are that: the spiral rib cambered surface design periodically changed along the axial direction of the screw rod can realize the shearing action and the stretching action on the materials, but mass transfer only occurs along the depth direction of the spiral groove on the cross section of each spiral groove in the process of moving the materials along the direction of the spiral groove due to the fact that the depth of the spiral groove is unchanged, the mixing effect is poor, meanwhile, the process of changing the volume of the materials from small to large depends on the expansion of a melt to fill a slow cavity, and the expansion is insufficient, so that the air wrapping is easy to occur.
To sum up, the prior art mainly has the problems: 1. insufficient mixing; 2. the process of melting materials is ignored and is slowly carried out, the occupied volumes of solid materials and melt materials with the same quality are different, and the problem of gas wrapping occurs.
Disclosure of Invention
The present utility model aims to solve, at least to some extent, one of the above technical problems in the prior art. Therefore, the embodiment of the utility model provides a screw with a parametrizable flow passage section, which solves the problems of insufficient mixing in the melting and plasticizing process of materials and steam drums in the extrusion melt.
The screw with the parametrizable flow passage section comprises a screw body, screw edges and a flow dividing mixing element, wherein the screw edges are arranged on the peripheral surfaces of the front section and the middle section of the screw body, so that the screw body is provided with a plurality of flow passages, and the section of each flow passage is a flow passage section; wherein, part or all of the flow channel sections are designed in a parameterized way along the direction of the spiral groove: the width of the spiral groove is increased, the depth of the spiral groove is reduced, and the depth of the spiral groove is increased, so that mass transfer exists in the width direction of the spiral groove and mass transfer exists in the depth direction of the spiral groove at the same time when mass transfer exists in each flow channel section, and the directions of the spiral groove and the flow channel section are consistent with the flow direction of materials; part or all of the flow channels gradually converge along the direction of the spiral grooves in a linear change rule, so that the materials are compacted continuously while being sheared and stretched; the flow dividing and mixing element comprises a plurality of flow blocking blocks arranged on the peripheral surface of the rear section of the screw body, and the flow blocking blocks are arranged in a spiral array, so that a material flow is divided and mixed once after passing through each row of flow blocking blocks.
In an alternative or preferred embodiment, the screw rib is provided with two screw ribs, namely a first screw rib and a second screw rib, the rear rib of the first screw rib and the front rib of the second screw rib form a first flow channel, the section of the first flow channel is a first flow channel section, the front rib of the first screw rib and the rear rib of the second screw rib form a second flow channel, the section of the second flow channel is a second flow channel section, the flow channel comprises the first flow channel and the second flow channel, the width of a screw groove of the first flow channel is W1, the depth of the screw groove of the second flow channel is H2, the whole screw rod with the parameterized design of the flow channel section is divided into a solid conveying section, a melting section and a metering section from the front section to the rear section, the solid conveying section comprises a solid conveying front section and a solid conveying rear section, and the metering section comprises a metering front section and a metering section.
In an alternative or preferred embodiment, in the solids conveying forward section, both the first flow path cross section and the second flow path cross section remain unchanged. Further, in the solid conveying front section, the thicknesses of the first screw flight and the second screw flight are all unchanged, and the screw groove depths of the first runner and the second runner are all unchanged.
In an alternative or preferred embodiment, the flow channel cross section is parametrically designed in the direction of the screw channel in the solid conveying back section, the melting section and the metering front section.
In the solid conveying rear section, the first screw thread and the second screw thread are designed with equal screw pitches, and the section of the first flow channel and the section of the second flow channel are continuously reduced along the direction of the screw grooves according to a linear rule; the spiral groove depth H1 of the first flow channel changes according to a sine rule and the spiral groove width W1 of the first flow channel changes according to a complementary cutting rule, the spiral groove depth H2 and the spiral groove width W2 of the second flow channel change according to the same rules as H1 and W2 respectively, and the phase difference is 180 degrees.
In the melting section, the first screw flight and the second screw flight are designed with equal screw pitches, and the section of the first flow channel and the section of the second flow channel are continuously reduced along the direction of the screw grooves according to a linear rule; the spiral groove depth H1 of the first flow channel adopts a sine change rule with a plurality of periods of smaller amplitude, the spiral groove width W1 of the first flow channel changes according to a complementary cutting rule, the change rule of the spiral groove depth H2 and the spiral groove width W2 of the second flow channel is respectively the same as H1 and W2, and the phase difference is 180 degrees.
In the metering front section, the first screw thread and the second screw thread are designed with equal screw pitches, and the first flow passage section and the second flow passage section are kept unchanged along the direction of the screw grooves; the spiral groove depth H1 of the first flow channel adopts a constant-amplitude multicycle sine change rule, the spiral groove width W1 of the first flow channel changes according to a complementary cutting rule, the change rule of the spiral groove depth H2 and the spiral groove width W2 of the second flow channel is respectively the same as H1 and W2, and the phase difference is 180 degrees.
In an alternative or preferred embodiment, the split mixing element is disposed in the post-metering section. Further, the method comprises the steps of,
in the split-flow mixing element, theThe flow blocking blocks are prismatic, the material flow is split and mixed once after passing through one row of the flow blocking blocks, and the material flow passes through 2 rows of the flow blocking blocks n The secondary branches and merges.
Based on the technical scheme, the embodiment of the utility model has at least the following beneficial effects: according to the technical scheme, part or all of the flow channels are gradually converged along the spiral groove direction, the cross section of the flow channels is continuously reduced along the spiral direction, the material generates a speed gradient along the flow direction in the flow channel process, and the material is sheared and simultaneously stretched in the flow process, so that the mechanical thermal history of the material is reduced, and meanwhile, the material is continuously compacted due to the convergence of the flow channels, so that the gas wrapping phenomenon is eliminated; the channel section with parametrization design has the periodical variation of the depth of the spiral groove and the width of the spiral groove, so that the mass transfer effect of the material is increased in the flowing process, and the mixing effect of the screw is improved.
Drawings
The utility model is further described below with reference to the drawings and examples;
FIG. 1 is a schematic diagram of an embodiment of the present utility model;
FIG. 2 is a cross-sectional view taken along the direction A-A in FIG. 1;
FIG. 3 is a cross-sectional view taken along the direction B-B in FIG. 1;
FIG. 4 is a cross-sectional view taken along the direction C-C in FIG. 1;
FIG. 5 is an expanded schematic view of a split mixing element in an embodiment of the utility model;
FIG. 6 is a schematic diagram of a change rule of a cross section of a flow channel according to an embodiment of the present utility model;
FIG. 7 is a schematic diagram of a change rule of the depth of a channel spiral groove in an embodiment of the utility model;
FIG. 8 is a schematic diagram of a variation rule of the width of the spiral groove of the flow channel in the embodiment of the utility model;
FIG. 8 is a schematic diagram of a variation rule of the width of the spiral groove of the flow channel in the embodiment of the utility model;
FIG. 9 is an expanded view of a fluted material according to an embodiment of the present utility model.
Detailed Description
Reference will now be made in detail to the present embodiments of the present utility model, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are used to supplement the description of the written description so that one can intuitively and intuitively understand each technical feature and overall technical scheme of the present utility model, but not to limit the scope of the present utility model.
In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.
In the description of the present utility model, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
Referring to fig. 1 to 9, there is shown a screw with a parametrizable flow channel section, which includes a screw body 100, screw ribs and a flow dividing mixing element 300, the screw ribs are provided in a plurality of numbers and are provided on the circumferential surfaces of the front and middle sections of the screw body 100, so that the screw body 100 has a plurality of flow channels, and the flow channel section is a flow channel section.
In this example, the screw body has a diameter 30, an aspect ratio 28, and a compression ratio of 3.0.
Wherein, the parameterized design is carried out on part or all of the sections of the flow channels along the direction of the spiral grooves: the width of the spiral groove is increased, the depth of the spiral groove is reduced, and the depth of the spiral groove is increased, so that mass transfer exists in the width direction of the spiral groove and mass transfer exists in the depth direction of the spiral groove at the same time when mass transfer exists in each flow channel section, and the directions of the spiral groove and the flow channel section are consistent with the flow direction of materials.
Part or all of the flow channels gradually converge along the linear change rule of the direction of the spiral grooves, so that the materials are compacted continuously while being sheared and stretched.
Specifically, referring to fig. 1, the screw with a parametrizable flow path section is divided into three sections, namely, a solid conveying section P1, a melting section P2 and a metering section P3, from the front section to the rear section, wherein the solid conveying section P1 comprises a solid conveying front section P11 and a solid conveying rear section P12, and the metering section P3 comprises a metering front section P31 and a metering rear section P32.
The screw flights are provided with two screw flights E1 and E2, wherein the screw flights have equal screw pitches as shown in FIG. 2, but the screw flights have variable thicknesses. The rear edge of the first screw edge E1 and the front edge of the second screw edge E2 form a first flow channel S1, the cross section of the first flow channel S1 is a first flow channel cross section, the front edge of the first screw edge E1 and the rear edge of the second screw edge E2 form a second flow channel S2, the cross section of the second flow channel S2 is a second flow channel cross section, the flow channel comprises the first flow channel S1 and the second flow channel S2, the spiral groove width of the first flow channel S1 is W1, the spiral groove depth is H1, the spiral groove width of the second flow channel S2 is W2, and the spiral groove depth is H2, as shown in fig. 3 and 4.
In the solids conveying forward section P11, both the first flow path cross section and the second flow path cross section remain unchanged in order to ensure continuous conveyance of equal amounts of solids. It can be understood that the thicknesses of the first screw edge E1 and the second screw edge E2 are all unchanged, and the screw depths of the first flow channel S1 and the second flow channel S2 are all unchanged, that is, the screw depth and the screw pitch are equal, and the screw widths W1 and W2 and the screw depths H1 and H2 are constant.
In the solid conveying rear section P12, the melting section P2 and the metering front section P31, the flow passage section is parametrically designed in the direction of the screw groove, that is, the screw groove width becomes large while the screw groove depth becomes small, and the screw groove width becomes small while the screw groove depth becomes large.
In the solid conveying rear section P12, in order to ensure material compaction and gas discharge among materials, the first screw edges E1 and the second screw edges E2 are designed with equal screw pitches, and the cross sections of the first flow channel and the second flow channel are continuously reduced along the direction of the screw grooves according to a linear rule; in order to increase the mixing and mass transfer effects in the width direction and the depth direction of the material in the cross section of the flow channel, the spiral groove depth H1 of the first flow channel S1 is changed according to a sine rule, the spiral groove width W1 of the first flow channel S1 is changed according to a complementary cutting rule, the change rules of the spiral groove depth H2 and the spiral groove width W2 of the second flow channel S2 are respectively identical to H1 and W2, and the phase difference is 180 degrees. The change rule of the depth and width of the spiral groove needs to be controlled by writing a specific program 1.
In the melting section P2, in order to reduce the thermal history of materials and compact and exhaust, the first screw thread E1 and the second screw thread E2 are designed with equal screw pitches, and the cross section of the first flow channel and the cross section of the second flow channel are continuously reduced along the direction of the screw grooves according to a linear rule; in order to ensure the mixing and compacting effects, the groove depth H1 of the first flow channel S1 adopts a sine change rule with a plurality of periods of smaller amplitude, the groove width W1 of the first flow channel S1 is changed according to a complementary cutting rule, the groove depth H2 and the groove width W2 of the second flow channel S2 are respectively identical to H1 and W2, and the phase difference is 180 degrees. The depth and width change rule of the spiral groove needs to be controlled by writing a specific program 2.
In the metering front section P31, in order to ensure stable conveying, the first screw edge E1 and the second screw edge E2 are designed with equal screw pitches, and the first flow passage section and the second flow passage section are kept unchanged along the direction of the screw grooves; in order to further enhance the mixing effect, the spiral groove depth H1 of the first flow channel S1 adopts a constant-amplitude multicycle sine change rule, the spiral groove width W1 of the first flow channel S1 is changed according to a complementary cutting rule, the change rule of the spiral groove depth H2 and the spiral groove width W2 of the second flow channel S2 is respectively the same as that of the first flow channel H1 and the second flow channel W2, and the phase difference is 180 degrees. The depth and width change rule of the spiral groove needs to be controlled by writing a specific program 3.
The split mixing element 300 is disposed in the post-metering section P32. Specifically, referring to fig. 5, the flow-dividing mixing element 300 includes a plurality of flow-blocking blocks 301 disposed on the circumferential surface of the rear section of the screw body 100, and each flow-blocking block 301 is arranged in a spiral array, so that the flow passes through the flow-blocking blocks 301 for one time and is mixed, and thus, the mixing effect can be further improved and the pressure fluctuation can be eliminated. Specifically, as shown in fig. 5, the choke block 301 is prismaticEach time the stream passes through a row of choked flow blocks 301, the stream is split and mixed once, and after passing through n rows of choked flow blocks, the stream passes through 2 n The secondary branches and merges.
The flow channel of the rear section P12 and the melting section P2 of the screw solid conveying with parametrizable flow channel section gradually converges along the spiral groove direction, the flow channel section continuously reduces along the spiral direction, the material generates a speed gradient along the flowing direction in the flow channel process, and the material is sheared and simultaneously stretched in the flowing process, so that the mechanical thermal history of the material is reduced, and meanwhile, the material is compacted continuously due to the convergence of the flow channel, so that the gas wrapping phenomenon is eliminated. The solid conveying rear section P12, the melting section P2 and the metering front section P31 are flow passage sections which are subjected to parameterization design, the screw groove depth and the screw groove width direction of the flow passage sections are periodically changed, as shown in fig. 9, the mass transfer effect of the materials is increased in the flowing process, and the mixing effect of the screw is improved.
In practical operation, a person skilled in the art performs parameterization design on the section of a specific section of the flow channel of the screw body along the direction of the spiral groove, and sets a linear change rule to gradually converge on the section of the flow channel, so that the screw can be adaptively adjusted in the art, and generally can be performed and properly adjusted at the middle section.
In this embodiment, in the solid conveying rear section P12, the change rule of the groove depth and the groove width of the flow channel is controlled according to a specific program 1, and the specific program 1 includes a control program of a first flow channel section S1 and a second flow channel section S2 of the solid conveying rear section P12, specifically:
H1＝1*sin(trajpar*360*2)+6；
W1＝(-1*(4*trajpar+3)+73)/(1*sin(trajpar*360*2)+6)；
H2＝-1*sin(trajpar*360*2)+6；
W2＝(-1*(4*trajpar+3)+73)/(-1*sin(trajpar*360*2)+6)。
in the melting section P2, the change rule of the groove depth and the groove width of the flow channel is controlled according to a specific program 2, wherein the specific program 2 comprises a first flow channel section S1 control program 1 of the melting section P2, specifically:
H1＝0.5*sin(trajpar*360*1)+6；
W1＝(-3.90909*(2*trajpar+7)+93.36364)/(0.5*sin(trajpar*360*1)+6)；
first flow channel section S1 control program 2:
H1＝-1.5*trajpar+6；
W1＝(-3.90909*(0.5*trajpar+9)+93.36364)/(-1.5*trajpar+6)；
first flow channel section S1 control program 3:
H1＝0.3*sin(trajpar*360*1)+4.5；
W1＝(-3.90909*(2*trajpar+9.5)+93.36364)/(0.3*sin(trajpar*360*1)+4.5)；
first flow path section S1 control program 4:
H1＝-0.9*trajpar+4.5；
W1＝(-3.90909*(0.5*trajpar+11.5)+93.36364)/(-0.9*trajpar+4.5)；
first flow path section S1 control program 5:
H1＝0.4*sin(trajpar*360*1.5)+3.6；
W1＝(-3.90909*(3*trajpar+12)+93.36364)/(0.4*sin(trajpar*360*1.5)+3.6)；
first flow path section S1 control program 6:
H1＝-1.1*trajpar+3.6；
W1＝(-3.90909*(0.5*trajpar+15)+93.36364)/(-1.1*trajpar+3.6)；
first flow path section S1 control program 7:
H1＝0.3*sin(trajpar*360*1)+2.5；
w1= (-3.90909 x (2 x trajpar+15.5) + 93.36364)/(0.3 x sin (trajpar x 360 x 1) +2.5); first flow path section S1 control program 8:
H1＝-0.6*trajpar+2.5；
W1＝(-3.90909*(0.5*trajpar+17.5)+93.36364)/(-0.6*trajpar+2.5)；
second flow path section S2 of melt section P2 control procedure 1:
H2＝-0.5*sin(trajpar*360*1)+6；
W2＝(-3.90909*(2*trajpar+7)+93.36364)/(-0.5*sin(trajpar*360*1)+6)；
second flow path section S2 control program 2:
H2＝-1.5*trajpar+6；
W2＝(-3.90909*(0.5*trajpar+9)+93.36364)/(-1.5*trajpar+6)；
second flow path section S2 control program 3:
H2＝-0.3*sin(trajpar*360*1)+4.5；
w2= (-3.90909 x (2 x trajpar+9.5) + 93.36364)/(-0.3 x sin (trajpar x 360 x 1) +4.5); second flow path section S2 control program 4:
H2＝-0.9*trajpar+4.5；
W2＝(-3.90909*(0.5*trajpar+11.5)+93.36364)/(-0.9*trajpar+4.5)；
second flow path section S2 control program 5:
H2＝0.4*sin(trajpar*360*1.5)+3.6；
w2= (-3.90909 x (3 x trajpar+12) + 93.36364)/(0.4 x sin (trajpar x 360 x 1.5) +3.6); second flow path section S2 control program 6:
H2＝-1.1*trajpar+3.6；
W2＝(-3.90909*(0.5*trajpar+15)+93.36364)/(-1.1*trajpar+3.6)；
second flow path section S2 control program 7:
H2＝-0.3*sin(trajpar*360*1)+2.5；
W2＝(-3.90909*(2*trajpar+15.5)+93.36364)/(-0.3*sin(trajpar*360*1)+2.5)；
second flow path section S2 control program 8:
H2＝-0.6*trajpar+2.5；
W2＝(-3.90909*(0.5*trajpar+17.5)+93.36364)/(-0.6*trajpar+2.5)。
in the metering front section P31, the change rule of the groove depth and the groove width of the flow channel is controlled according to a specific program 3, and the specific program 3 comprises a first flow channel section S1 and a second flow channel section S2 control program of the metering front section, specifically:
H1＝0.1*sin(trajpar*360*4.5)+1.9；
W1＝23/(0.1*sin(trajpar*360*4.5)+1.9)；
H2＝-0.1*sin(trajpar*360*4.5)+1.9；
W2＝23/(-0.1*sin(trajpar*360*4.5)+1.9)。
the specific program 1, the specific program 2 and the specific program 3 are specific embodiments of the control flow passage section parameterized design of the present utility model, and in other embodiments, other control programs can be adopted as well, so long as the following conditions are satisfied: the cross section of part or all of the flow channels is designed in a parameterization manner along the direction of the spiral groove, the width of the spiral groove is increased, the depth of the spiral groove is reduced, and the width of the spiral groove is reduced, and the depth of the spiral groove is increased; and simultaneously realizing gradual convergence of part or all of the flow channels along the direction of the spiral grooves in a linear change rule.
The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model.
Claims (10)
1. The screw with the parametrizable flow passage section is characterized by comprising a screw body, screw edges and a flow dividing mixing element, wherein the screw edges are arranged on the peripheral surfaces of the front section and the middle section of the screw body, so that the screw body is provided with a plurality of flow passages, and the section of each flow passage is a flow passage section; wherein,
and carrying out parameterized design on part or all of the sections of the flow channels along the direction of the spiral grooves: the width of the spiral groove is increased, the depth of the spiral groove is reduced, and the depth of the spiral groove is increased, so that mass transfer exists in the width direction of the spiral groove and mass transfer exists in the depth direction of the spiral groove at the same time when mass transfer exists in each flow channel section, and the directions of the spiral groove and the flow channel section are consistent with the flow direction of materials;
part or all of the flow channels gradually converge along the direction of the spiral grooves in a linear change rule, so that the materials are compacted continuously while being sheared and stretched;
the flow dividing and mixing element comprises a plurality of flow blocking blocks arranged on the peripheral surface of the rear section of the screw body, and the flow blocking blocks are arranged in a spiral array, so that a material flow is divided and mixed once after passing through each row of flow blocking blocks.
2. The screw of claim 1, wherein the flow channel cross section is parametrizable, characterized by: the screw edges are provided with a first screw edge and a second screw edge respectively, the rear edge of the first screw edge and the front edge of the second screw edge form a first flow channel, the section of the first flow channel is a first flow channel section, the front edge of the first screw edge and the rear edge of the second screw edge form a second flow channel, the section of the second flow channel is a second flow channel section, the flow channels comprise the first flow channel and the second flow channel, the screw rod with the section capable of being parametrically designed is divided into a solid conveying section, a melting section and a metering section from a front section to a rear section, wherein the solid conveying section comprises a solid conveying front section and a solid conveying rear section, and the metering section comprises a metering front section and a metering rear section; wherein,
in the solids conveying forward section, both the first flow passage cross section and the second flow passage cross section remain unchanged;
the flow channel section is parametrically designed along the direction of the spiral groove in the solid conveying rear section, the melting section and the metering front section;
the split mixing element is disposed in the metering rear section.
3. The screw of claim 2, wherein the flow passage cross section is parametrizable, characterized by: in the solid conveying front section, the thicknesses of the first screw edges and the second screw edges are unchanged, and the screw groove depths of the first flow channel and the second flow channel are unchanged.
4. The screw of claim 2, wherein the flow passage cross section is parametrizable, characterized by: in the solid conveying rear section, the first screw thread and the second screw thread are designed with equal screw pitches, and the section of the first flow channel and the section of the second flow channel are continuously reduced along the direction of the screw grooves according to a linear rule; the spiral groove depth H1 of the first flow channel changes according to a sine rule and the spiral groove width W1 of the first flow channel changes according to a complementary cutting rule, the spiral groove depth H2 and the spiral groove width W2 of the second flow channel change according to the same rules as H1 and W2 respectively, and the phase difference is 180 degrees.
5. The screw with parametrizable flow channel cross section according to claim 4, wherein the variation of the channel depth and the channel width in the solid conveying back section is controlled according to a specific program 1, wherein the specific program 1 comprises
The first flow passage section and the second flow passage section of the solid conveying rear section control program:
H1＝1*sin(trajpar*360*2)+6；
W1＝(-1*(4*trajpar+3)+73)/(1*sin(trajpar*360*2)+6)；
H2＝-1*sin(trajpar*360*2)+6；
W2＝(-1*(4*trajpar+3)+73)/(-1*sin(trajpar*360*2)+6)。
6. the screw of claim 2, wherein the flow passage cross section is parametrizable, characterized by: in the melting section, the first screw flight and the second screw flight are designed with equal screw pitches, and the section of the first flow channel and the section of the second flow channel are continuously reduced along the direction of the screw grooves according to a linear rule; the spiral groove depth H1 of the first flow channel adopts a sine change rule with a plurality of periods of smaller amplitude, the spiral groove width W1 of the first flow channel changes according to a complementary cutting rule, the change rule of the spiral groove depth H2 and the spiral groove width W2 of the second flow channel is respectively the same as H1 and W2, and the phase difference is 180 degrees.
7. The screw with parametrizable flow channel cross section according to claim 6, wherein the variation of the groove depth and the groove width of the flow channel in the melting section is controlled according to a specific program 2, wherein the specific program 2 comprises
First flow channel section control procedure 1 for the melt section:
H1＝0.5*sin(trajpar*360*1)+6；
W1＝(-3.90909*(2*trajpar+7)+93.36364)/(0.5*sin(trajpar*360*1)+6)；
first flow passage section control program 2:
H1＝-1.5*trajpar+6；
W1＝(-3.90909*(0.5*trajpar+9)+93.36364)/(-1.5*trajpar+6)；
first flow passage section control program 3:
H1＝0.3*sin(trajpar*360*1)+4.5；
w1= (-3.90909 x (2 x trajpar+9.5) + 93.36364)/(0.3 x sin (trajpar x 360 x 1) +4.5); first flow passage section control program 4:
H1＝-0.9*trajpar+4.5；
W1＝(-3.90909*(0.5*trajpar+11.5)+93.36364)/(-0.9*trajpar+4.5)；
first flow passage section control program 5:
H1＝0.4*sin(trajpar*360*1.5)+3.6；
w1= (-3.90909 x (3 x trajpar+12) + 93.36364)/(0.4 x sin (trajpar x 360 x 1.5) +3.6); first flow passage section control program 6:
H1＝-1.1*trajpar+3.6；
W1＝(-3.90909*(0.5*trajpar+15)+93.36364)/(-1.1*trajpar+3.6)；
first flow passage section control program 7:
H1＝0.3*sin(trajpar*360*1)+2.5；
w1= (-3.90909 x (2 x trajpar+15.5) + 93.36364)/(0.3 x sin (trajpar x 360 x 1) +2.5); first flow passage section control program 8:
H1＝-0.6*trajpar+2.5；
W1＝(-3.90909*(0.5*trajpar+17.5)+93.36364)/(-0.6*trajpar+2.5)；
second flow path cross section control procedure 1 for the melt section:
H2＝-0.5*sin(trajpar*360*1)+6；
w2= (-3.90909 x (2 x trajpar+7) + 93.36364)/(0.5 x sin (trajpar x 360 x 1) +6); second flow passage section control program 2:
H2＝-1.5*trajpar+6；
W2＝(-3.90909*(0.5*trajpar+9)+93.36364)/(-1.5*trajpar+6)；
second flow passage section control program 3:
H2＝-0.3*sin(trajpar*360*1)+4.5；
w2= (-3.90909 x (2 x trajpar+9.5) + 93.36364)/(-0.3 x sin (trajpar x 360 x 1) +4.5); second flow passage section control program 4:
H2＝-0.9*trajpar+4.5；
W2＝(-3.90909*(0.5*trajpar+11.5)+93.36364)/(-0.9*trajpar+4.5)；
second flow passage section control program 5:
H2＝0.4*sin(trajpar*360*1.5)+3.6；
W2＝(-3.90909*(3*trajpar+12)+93.36364)/(0.4*sin(trajpar*360*1.5)+3.6)；
second flow passage section control program 6:
H2＝-1.1*trajpar+3.6；
W2＝(-3.90909*(0.5*trajpar+15)+93.36364)/(-1.1*trajpar+3.6)；
second flow passage section control program 7:
H2＝-0.3*sin(trajpar*360*1)+2.5；
W2＝(-3.90909*(2*trajpar+15.5)+93.36364)/(-0.3*sin(trajpar*360*1)+2.5)；
second flow passage section control program 8:
H2＝-0.6*trajpar+2.5；
W2＝(-3.90909*(0.5*trajpar+17.5)+93.36364)/(-0.6*trajpar+2.5)。
8. the screw of claim 2, wherein the flow passage cross section is parametrizable, characterized by: in the metering front section, the first screw thread and the second screw thread are designed with equal screw pitches, and the first flow passage section and the second flow passage section are kept unchanged along the direction of the screw grooves; the spiral groove depth H1 of the first flow channel adopts a constant-amplitude multicycle sine change rule, the spiral groove width W1 of the first flow channel changes according to a complementary cutting rule, the change rule of the spiral groove depth H2 and the spiral groove width W2 of the second flow channel is respectively the same as H1 and W2, and the phase difference is 180 degrees.
9. The screw of claim 8, wherein the flow channel cross section is parametrizable, characterized by: in the metering front section, the change rule of the screw groove depth and the screw groove width of the flow channel is controlled according to a specific program 3, wherein the specific program 3 comprises
The first flow passage section and the second flow passage section of the metering front section control program:
H1＝0.1*sin(trajpar*360*4.5)+1.9；
W1＝23/(0.1*sin(trajpar*360*4.5)+1.9)；
H2＝-0.1*sin(trajpar*360*4.5)+1.9；
W2＝23/(-0.1*sin(trajpar*360*4.5)+1.9)。
10. the screw of claim 2, wherein the flow passage cross section is parametrizable, characterized by: in the flow dividing and mixing element, the flow blocking blocks are prismatic, the material flow passes through one flow dividing and mixing for each row of the flow blocking blocks, and the material flow passes through 2 rows of the flow blocking blocks n The secondary branches and merges.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311611110.7A CN117734142A (en) | 2023-11-28 | 2023-11-28 | Screw with parametrizable flow passage section |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311611110.7A CN117734142A (en) | 2023-11-28 | 2023-11-28 | Screw with parametrizable flow passage section |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117734142A true CN117734142A (en) | 2024-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311611110.7A Pending CN117734142A (en) | 2023-11-28 | 2023-11-28 | Screw with parametrizable flow passage section |
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| Country | Link |
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| CN (1) | CN117734142A (en) |
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2023
- 2023-11-28 CN CN202311611110.7A patent/CN117734142A/en active Pending
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