CN103112193B - Homodromous self-cleaning double-screw extruder with stretching function and processing method thereof - Google Patents

Abstract

The invention discloses a homodromous self-cleaning double-screw extruder with a stretching function. The homodromous self-cleaning double-screw extruder with the stretching function comprises a machine barrel, a first screw and a second screw. The cross section of the first screw and the cross section of the second screw are both formed by multiple sections of circular arcs which are unequal in radius of curvature, and the cross section of the first screw and the cross section of the second screw are different in shape. The invention further provides a processing method of the homodromous self-cleaning double-screw extruder with the stretching function. According to the homodromous self-cleaning double-screw extruder with the stretching function and the processing method of the homodromous self-cleaning double-screw extruder with the stretching function, when the first screw and the second screw which are different in cross-section shape rotate in an identical direction, periodical change happens to a cross-section shape of a flow passage, so that a compression action and a squeezing action are applied on materials in the flow passage, a flowing space of the materials is compressed and expanded in a periodical mode, and therefore a chaotic mixing effect is generated, a mixing and heat transfer process is strengthened, a thermal and mechanical process which is plasticized is largely shortened, energy consumption is low, an energy-saving and consumption-reducing effect is notable.

Description

There is the self-cleaning in the same way double screw extruder of stretching action and processing method thereof

Technical field

The present invention relates to double screw extruder technical field, be specifically related to one and there is the self-cleaning in the same way double screw extruder of stretching action and processing method thereof.

Background technology

In recent years, auxiliary agent, always towards energy consumption saving wheel, is reduced in the field such as processing of high molecular material, food processing, and the direction of water saving material-saving, shortening processing course, control goods microcosmic phase morphology structure etc. strides forward.The parallel dual-screw extruding machine with self-cleaning function is at the widely used process equipment in the field such as processing of high molecular material, food processing.The parallel dual-screw extruding machine with self-cleaning function mainly comprises the machine barrel twin-screw that be installed on the inner chamber of machine barrel parallel with two.After processed material to enter the inner chamber of machine barrel from charging aperture, the effect that twin-screw is mainly carried material and mixed, thus make material can be better processed in the transportation section of machine barrel, melt zone, exhaust section and mixing extrusion section.

At present, the structure with two screw rods of the parallel dual-screw extruding machine of self-cleaning function is identical, and the phase angle that the inner chamber phase difference being installed on machine barrel is certain, then twin-screw and inner chamber form the runner carrying out movement for material.Because the shape of two screw rods is identical, there is symmetry, namely the cross sectional shape of runner can not change by generating period, so after material enters inner chamber from charging aperture, twin-screw cannot extrude material and mix, thus material is made to lack the effect of compression, extruding when runner.Due to above-mentioned factor, the current parallel dual-screw extruding machine with self-cleaning function adds man-hour requirement to material and consumes a large amount of energy, uses more auxiliary agent, water and material etc., and yields poorly; Simultaneously the processing course of material is longer and microcosmic phase morphology structure that is goods is poor and inefficiency.

Summary of the invention

The deficiency that the present invention exists to overcome above prior art, provide a kind of consumed energy few, transfer efficiency is high, and what working (machining) efficiency was high has the self-cleaning in the same way double screw extruder of stretching action and processing method thereof.

Object of the present invention is realized by following technical scheme: originally have the self-cleaning in the same way double screw extruder of stretching action, comprise machine barrel and screw mechanism, inner chamber is provided with in described machine barrel, described screw mechanism is installed on inner chamber, described screw mechanism comprises the first screw rod and the second screw rod, described first screw rod and the second screw rod engage each other, and described first screw rod and the second screw rod are all tangent with the inwall of inner chamber; The inner chamber of described first screw rod, the second screw rod and machine barrel forms runner; The cross section of described first screw rod and the second screw rod is all for being made up of multistage radius of curvature circular arc not etc., and the first screw rod is different with the cross sectional shape of the second screw rod, and the circular arc quantity of two sections is equal; When the first screw rod and the second bolt rotary, the cross sectional shape cyclically-varying of described runner.

The quantity of the circular arc in the cross section of described first screw rod is 4 to 10 sections.

The quantity of the circular arc in the cross section of described first screw rod and the second screw rod is 4 sections, and wherein, 4 sections of circular arcs in the cross section of the first screw rod are respectively L ₁l ₂, L ₂l ₃, L ₃l ₄and L ₄l ₁, and circular arc L ₁l ₂, L ₂l ₃, L ₃l ₄and L ₄l ₁central angle be respectively α ₁₁, β ₁₁, 2 π-α ₁₁-β ₁₁-β ₁₂and β ₁₂, and circular arc L ₃l ₄tangent with inner chamber;

Wherein, β ₁₁=β ₁₂, 0< α ₁₁< π-β ₁₁;

4 sections of circular arcs in the cross section of the second screw rod are respectively R ₁r ₂, R ₂r ₃, R ₃r ₄and R ₄r ₁, and circular arc R ₁r ₂, R ₂r ₃, R ₃r ₄and R ₄r ₁respectively with L ₁l ₂, L ₂l ₃, L ₃l ₄and L ₄l ₁coordinate, circular arc R ₁r ₂, R ₂r ₃, R ₃r ₄and R ₄r ₁central angle respectively with L ₁l ₂, L ₂l ₃, L ₃l ₄and L ₄l ₁equal; And circular arc R ₁r ₂tangent with inner chamber;

Described first screw rod pivot O ₁with the second screw rod pivot O ₂between distance be C ₁, and the maximum outside diameter of the first screw rod and the second screw rod is D ₁, minimum diameter is d ₁, at circular arc L in described first screw rod ₂l ₃and L ₄l ₁the ventral horn of spiral shell abdomen and the second screw rod in circular arc R ₂r ₃and R ₄r ₁the ventral horn of spiral shell abdomen be η ₁, and η ₁=β ₁₁=β ₁₂, described circular arc L ₁l ₂and L ₃l ₄radius be respectively d ₁/ 2 and D ₁/ 2; Described circular arc L ₁l ₂and L ₃l ₄the center of circle be the pivot O of the first screw rod ₁; Described circular arc L ₂l ₃and L ₄l ₁radius be C ₁, and described circular arc L ₂l ₃the center of circle be L ₂o ₁extended line with O ₁for the center of circle and think D ₁the intersection point of the circular arc of/2 radiuses; Described circular arc L ₄l ₁the center of circle be L ₁o ₁extended line with O ₁for the center of circle and think D ₁the intersection point of the circular arc of/2 radiuses;

Described circular arc R ₁r ₂and R ₃r ₄radius be respectively D ₁/ 2 and d ₁/ 2; Described circular arc R ₁r ₂and R ₃r ₄the center of circle be the pivot O of the second screw rod ₂; Described circular arc R ₂r ₃and R ₄r ₁radius be C ₁, and described circular arc R ₂r ₃the center of circle be R ₃o ₂extended line with O ₂for the center of circle with D ₁/ 2 is the intersection point of the circular arc of radius; Described circular arc R ₄r ₁the center of circle be R ₄o ₂extended line with O ₂for the center of circle with D ₁/ 2 is the intersection point of the circular arc of radius.

Described first screw rod and the second screw rod are one start screw screw rod.

The quantity of the circular arc in the cross section of described first screw rod and the second screw rod is 10 sections, and wherein, 10 sections of circular arcs in the cross section of the first screw rod are respectively H ₁h ₂, H ₂h ₃, H ₃h ₄, H ₄h ₅, H ₅h ₆, H ₆h ₇, H ₇h ₈, H ₈h ₉, H ₉h ₁₀and H ₁₀h ₁, and circular arc H ₁h ₂, H ₂h ₃, H ₃h ₄, H ₄h ₅, H ₅h ₆, H ₆h ₇, H ₇h ₈, H ₈h ₉, H ₉h ₁₀and H ₁₀h ₁central angle be respectively α ₂₁, β ₂₁, γ ₂₁, β ₂₂, α ₂₂, α ₂₃, β ₂₃, γ ₂₂, β ₂₄and α ₂₄, and circular arc H ₁h ₂, H ₅h ₆, H ₆h ₇and H ₁₀h ₁it is all tangent with inner chamber,

Wherein, β ₂₁=β ₂₂=β ₂₃=β ₂₄,

0≤α ₂₃+α ₂₂＜π－（β ₂₁+β ₂₂+β ₂₃+β ₂₄）/2－（γ ₂₁+γ ₂₂）/2，

I.e. 0≤α ₂₃+ α ₂₂< α ₂₁+ α ₂₄; Meanwhile, γ ₂₁+ γ ₂₂>=0;

10 sections of circular arcs in the cross section of the second screw rod are respectively I ₁i ₂, I ₂i ₃, I ₃i ₄, I ₄i ₅, I ₅i ₆, I ₆i ₇, I ₇i ₈, I ₈i ₉, I ₉i ₁₀and I ₁₀i ₁, and circular arc I ₁i ₂, I ₂i ₃, I ₃i ₄, I ₄i ₅, I ₅i ₆, I ₆i ₇, I ₇i ₈, I ₈i ₉, I ₉i ₁₀and I ₁₀i ₁respectively with circular arc H ₁h ₂, H ₂h ₃, H ₃h ₄, H ₄h ₅, H ₅h ₆, H ₆h ₇, H ₇h ₈, H ₈h ₉, H ₉h ₁₀and H ₁₀h ₁coordinate, meanwhile, described circular arc I ₁i ₂, I ₂i ₃, I ₃i ₄, I ₄i ₅, I ₅i ₆, I ₆i ₇, I ₇i ₈, I ₈i ₉, I ₉i ₁₀and I ₁₀i ₁central angle respectively with H ₁h ₂, H ₂h ₃, H ₃h ₄, H ₄h ₅, H ₅h ₆, H ₆h ₇, H ₇h ₈, H ₈h ₉, H ₉h ₁₀and H ₁₀h ₁equal; And circular arc I ₃i ₄and I ₈i ₉all tangent with inner chamber;

Described first screw rod pivot O ₁with the second screw rod pivot O ₂between distance be C ₂, and the maximum outside diameter of the first screw rod and the second screw rod is D ₂, minimum diameter is d ₂, at circular arc H in described first screw rod ₂h ₃, H ₄h ₅, H ₇h ₈and H ₉h ₁₀the ventral horn of spiral shell abdomen and the second screw rod at circular arc I ₂i ₃, I ₄i ₅, I ₇i ₈and I ₉i ₁₀the ventral horn of spiral shell abdomen be η ₂, and η ₂=β ₂₁=β ₂₂=β ₂₃=β ₂₄, described circular arc H ₁h ₂, H ₅h ₆, H ₆h ₇and H ₁₀h ₁radius be D ₂/ 2; Described H ₃h ₄and H ₈h ₉radius be d ₂/ 2; And described H ₁h ₂, H ₃h ₄, H ₅h ₆, H ₆h ₇, H ₈h ₉and H ₁₀h ₁the center of circle is the pivot O of the first screw rod ₁, described circular arc H ₂h ₃, H ₄h ₅, H ₇h ₈and H ₉h ₁₀radius be C ₂, described circular arc H ₂h ₃the center of circle be H ₃o ₁extended line with O ₁for the center of circle with D ₂/ 2 is the intersection point of the circular arc of radius; Described circular arc H ₄h ₅the center of circle be H ₄o ₁extended line with O ₁for the center of circle with D ₂/ 2 is the intersection point of the circular arc of radius; Described circular arc H ₇h ₈the center of circle be H ₈o ₁extended line with O ₁for the center of circle with D ₂/ 2 is the intersection point of the circular arc of radius; Described circular arc H ₉h ₁₀the center of circle be H ₉o ₁extended line with O ₁for the center of circle with D ₂/ 2 is the intersection point of the circular arc of radius;

Described circular arc I ₃i ₄and I ₈i ₉radius be D ₂/ 2; Described I ₁i ₂, I ₅i ₆, I ₆i ₇and I ₁₀i ₁radius be d ₂/ 2; And described I ₁i ₂, I ₃i ₄, I ₅i ₆, I ₆i ₇, I ₈i ₉and I ₁₀i ₁the center of circle is the pivot O of the second screw rod ₂, described circular arc I ₂i ₃, I ₄i ₅, I ₇i ₈and I ₉i ₁₀radius be C ₂, described circular arc I ₂i ₃the center of circle be I ₂o ₂extended line with O ₂for the center of circle with D ₂/ 2 is the intersection point of the circular arc of radius; Described circular arc I ₄i ₅the center of circle be I ₅o ₂extended line with O ₂for the center of circle with D ₂/ 2 is the intersection point of the circular arc of radius; Described circular arc I ₇i ₈the center of circle be I ₇o ₂extended line with O ₂for the center of circle with D ₂/ 2 is the intersection point of the circular arc of radius; Described circular arc I ₉i ₁₀the center of circle be I ₁₀o ₂extended line with O ₂for the center of circle with D ₂/ 2 is the intersection point of the circular arc of radius.

Described first screw rod and the second screw rod are two-thread worm.

The quantity of the circular arc in the cross section of described first screw rod and the second screw rod is 7 sections, and wherein, 7 sections of circular arcs in the cross section of the first screw rod are respectively M ₁m ₂, M ₂m ₃, M ₃m ₄, M ₄m ₅, M ₅m ₆, M ₆m ₇and M ₇m ₁, and circular arc M ₁m ₂, M ₂m ₃, M ₃m ₄, M ₄m ₅, M ₅m ₆, M ₆m ₇and M ₇m ₁central angle be respectively α ₃₁, β ₃₁, γ ₃₂, ε ₃₁, ε ₃₂, γ ₃₁and β ₃₂, and circular arc M ₁m ₂tangent with inner chamber 4;

Wherein, β ₃₁=β ₃₂, ε ₃₁=ε ₃₂,

0＜α ₃₁＜π－（β ₃₁+β ₃₂）/2－γ ₃₂/2－ε ₃₁/2－ε ₃₂/2，

That is, 0 < α ₃₁< γ ₃₁;

7 sections of circular arcs in the cross section of the second screw rod are respectively N ₁n ₂, N ₂n ₃, N ₃n ₄, N ₄n ₅, N ₅n ₆, N ₆n ₇and N ₇n ₁, described circular arc N ₁n ₂, N ₂n ₃, N ₃n ₄, N ₄n ₅, N ₅n ₆, N ₆n ₇and N ₇n ₁respectively with circular arc M ₁m ₂, M ₂m ₃, M ₃m ₄, M ₄m ₅, M ₅m ₆, M ₆m ₇and M ₇m ₁coordinate, and circular arc N ₁n ₂, N ₂n ₃, N ₃n ₄, N ₄n ₅, N ₅n ₆, N ₆n ₇and N ₇n ₁central angle respectively with M ₁m ₂, M ₂m ₃, M ₃m ₄, M ₄m ₅, M ₅m ₆, M ₆m ₇and M ₇m ₁equal; And circular arc N ₃n ₄and N ₆n ₇all tangent with inner chamber;

The pivot O of described first screw rod ₁with the pivot O of the second screw rod ₂between distance be C ₃, and the maximum outside diameter of the first screw rod and the second screw rod is D ₃, minimum diameter is d ₃, described circular arc M ₄m ₅with M ₅m ₆between intersection point M ₅be d with being positioned at diameter ₃₀circle on, and d ₃< d ₃₀< D ₃; At circular arc M in described first screw rod ₂m ₃and M ₇m ₁the ventral horn of spiral shell abdomen and the second screw rod at circular arc N ₂n ₃and N ₇n ₁the ventral horn of spiral shell abdomen be η ₃, and η ₃=β ₃₁=β ₃₂, at circular arc M in described first screw rod ₄m ₅and M ₅m ₆the ventral horn of spiral shell abdomen and the second screw rod at circular arc N ₄n ₅and N ₅n ₆the ventral horn of spiral shell abdomen be η ₄, and ${\mathrm{\&eta;}}_4=\mathrm{\&pi;}-\arccos \left(\frac{{D_3}^2+d_{30}-{{4C}_3}^2}{{2D}_3{d}_{30}}\right).$

Described circular arc M ₁m ₂radius be D ₃/ 2; Described M ₃m ₄and M ₆m ₇radius be d ₃/ 2; And described M ₁m ₂, M ₃m ₄and M ₆m ₇the center of circle is the pivot O of the first screw rod ₁, described circular arc M ₂m ₃, M ₄m ₅, M ₅m ₆and M ₇m ₁radius be C ₃, described circular arc M ₂m ₃the center of circle be M ₃o ₁extended line with O ₁for the center of circle with D ₃/ 2 is the intersection point of the circular arc of radius; Described circular arc M ₄m ₅the center of circle be M ₄o ₁extended line with O ₁for the center of circle with D ₃/ 2 is the intersection point of the circular arc of radius; Described circular arc M ₅m ₆the center of circle be M ₆o ₁extended line with O ₁for the center of circle with D ₃/ 2 is the intersection point of the circular arc of radius; Described circular arc M ₇m ₁the center of circle be M ₇o ₁extended line with O ₁for the center of circle with D ₃/ 2 is the intersection point of the circular arc of radius;

Described circular arc N ₃n ₄and N ₆n ₇radius be D ₃/ 2; Described N ₁the radius of N2 is d ₃/ 2; And described N ₁n ₂, N ₃n ₄and N ₆n ₇the center of circle is the pivot O of the second screw rod ₂, described circular arc N ₂n ₃, N ₄n ₅, N ₅n ₆and N ₇n ₁radius be C ₃, described circular arc N ₂n ₃the center of circle be N ₂o ₂extended line with O ₂for the center of circle with D ₃/ 2 is the intersection point of the circular arc of radius; Described circular arc N ₄n ₅the center of circle be N ₅o ₂extended line with O ₂for the center of circle with D ₃/ 2 is the intersection point of the circular arc of radius; Described circular arc N ₅n ₆the center of circle be N ₅o ₂extended line with O ₂for the center of circle with D ₃/ 2 is the intersection point of the circular arc of radius; Described circular arc N ₇n ₁the center of circle be N ₁o ₂extended line with O ₂for the center of circle with D ₃/ 2 is the intersection point of the circular arc of radius.

Described first screw rod and the second screw flight head number are non-integer dimension.

Described have the self-cleaning in the same way double screw extruder of stretching action and also comprise the first pulsing mechanism and the second pulsing mechanism, and described machine barrel is provided with transportation section, melt zone, exhaust section and mixing extrusion section; Described transportation section, melt zone, exhaust section and mixing extrusion section are arranged in order from the moving direction of processed material; Be provided with the charging aperture with inner space above described transportation section, above described exhaust section, be provided with the exhaust outlet with inner space; The first lancing door with inner space is provided with below described exhaust section; Described first pulsing mechanism is installed on below exhaust section, and described first pulsing mechanism inserts the first lancing door; The end of described mixing extrusion section is provided with discharging opening; The second lancing door with inner space is provided with below described mixing extrusion section; Described second pulsing mechanism is installed on below mixing extrusion section, and the second described pulsing mechanism inserts the second lancing door.

Described first pulsing mechanism comprises the first eccentric wheel, the first rotating shaft and the first rod member, described first eccentric wheel is installed on below exhaust section by the first rotating shaft, the lower end of the first rod member is provided with the first outer rim, and described first eccentric upper end is withstood below the first outer rim; The first lancing door is inserted in the upper end of described first rod member; The first eccentric wheel is driven to rotate, then the first rod member is then subject to the first eccentric effect and moves back and forth up and down, thus stretching action and axial backmixing effect are produced to the material of the melt in the runner of exhaust section, therefore the gas that can accelerate in the material of melt is discharged from exhaust outlet, simultaneously the first screw rod, between the second screw rod and the first rod member mutual wiping achieve self-cleaning action.

Described second pulsing mechanism comprises the second eccentric wheel, the second rotating shaft and the second rod member, described second eccentric wheel is installed on below mixing extrusion section by the second rotating shaft, the lower end of described second rod member is provided with the second outer rim, and described second eccentric upper end is withstood below the second outer rim; The second lancing door is inserted in the upper end of described second rod member.In like manner, the second eccentric wheel is driven to rotate, then the second rod member is then subject to the second eccentric effect and moves back and forth up and down, thus stretching action and axial backmixing effect are produced to the material of the melt in the runner of mixing extrusion section, then promote the mixing plasticizing of the material of melt, and the material of melt is extruded from discharging opening, simultaneously the first screw rod, between the second screw rod and the second rod member mutual wiping achieve self-cleaning action.

Described first eccentric wheel and the second eccentric wheel all can use cam to replace.

Originally there is the processing method of the self-cleaning in the same way double screw extruder of stretching action, comprise the following steps:

(1), after material enters the runner of transportation section from charging aperture, the first screw rod and the second screw rod are respectively along respective screw axis constant velocity rotation in the same way; Under the axial positive conveyance power of the first screw rod and the second screw rod and the frictional force acting in conjunction between the first screw rod and the second screw rod, realize charging conveying, force material to move to the runner direction of melt zone;

(2) when material moves to the runner place of melt zone, due to the cross sectional shape cyclically-varying of runner, thus material is compressed and extrudes, then material pre-fusion, and the first screw rod and the second screw rod High Rotation Speed produce frictional heat, make material melt in the external heat acting in conjunction of machine barrel simultaneously; When the rotating in same direction of the first screw rod and the second screw rod, accelerate being separated of the material of melt and the material of solid, the cross sectional shape cyclically-varying of described runner and the melting process of the material of the chaotic mixing effect accelerating solid produced, make material become melt;

(3) after the material of melt enters the runner of exhaust section from the runner of melt zone, the continuous turning over materials of rotating in same direction of the first screw rod and the second screw rod, the first rod member being now installed on the first pulsing mechanism of exhaust section does up and down reciprocatingly vertical motion by the first eccentric effect, cause the generation of the material periodicity leakage current of melt, then tensile force field action and axial backmixing effect are produced to the material of melt, accelerate gas to discharge from exhaust outlet, first screw rod, mutual wiping action between second screw rod and the second rod member achieves self-cleaning action, and the material of melt moves to the runner direction of mixing extrusion section further by the effect of the first screw rod and the second screw rod,

(4) after the material of melt enters the runner of mixing extrusion section, the cross sectional shape cyclically-varying of the runner of mixing extrusion section, the then material of the melt effect that is compressed in the runner of mixing extrusion section and extrudes, when moving ahead under the rotating in same direction effect of the first screw rod and the second screw rod simultaneously, second pulsing mechanism produces tensile force field action and axial backmixing invigoration effect to the material of melt, thus mixing plasticizing is carried out to the material of melt, and make that the material of melt is stable to be extruded from discharging opening; Meanwhile, the first screw rod, mutual wiping action between the second screw rod and the second rod member achieve self-cleaning action.

The present invention has following advantage relative to prior art:

1, the first screw rod of the present invention is different with the shape of cross section of the second screw rod, thus when the first screw rod and the second screw rod rotating in same direction, the cross sectional shape cyclically-varying of runner, improves Solid Conveying and Melting efficiency, can increase greatly and extrude output, be applicable to the processing of large output.

2, first screw rod of the present invention is different with the shape of cross section of the second screw rod, thus when the first screw rod and the second screw rod rotating in same direction, introduce symmetry breaking effect, the cross sectional shape cyclically-varying of runner, the effect that material then in runner can be compressed and extrude, introduce the slide block that horizontal pulsing mechanism brings up and down reciprocatingly to pulse simultaneously, Flow of Goods and Materials space periodicity is compressed, expansion, thus produce chaotic mixing effect, enhance mixing and diabatic process, make the heat of plasticizing, machinery course shortens greatly, energy consumption is low, energy conservation and consumption reduction effects is remarkable.

3, present invention employs the first screw rod, mutual wiping action between the second screw rod and the first rod member and the first screw rod, mutual wiping action between the second screw rod and the second rod member, achieve process self-cleaning action.

4, of the present inventionly have employed the first pulsing mechanism and the second pulsing mechanism, thus make material create periodically axial leakage current, improve axial backmixing effect, enhance mixed milling intensity and effect comprehensively, there is extremely excellent dispersion distributed rendering effect, make process residence time destribution narrower, improve working (machining) efficiency and effect, be particularly useful for the processing of high yield, nano material.

Accompanying drawing explanation

Fig. 1 is the structural representation with the self-cleaning in the same way double screw extruder of stretching action of embodiment 1.

Fig. 2 is the sectional view in A-A direction in Fig. 1.

Fig. 3 is the structural representation with the self-cleaning in the same way double screw extruder of stretching action of embodiment 2.

Fig. 4 is the structural representation with the self-cleaning in the same way double screw extruder of stretching action of embodiment 3.

Fig. 5 is the structural representation with the self-cleaning in the same way double screw extruder of stretching action of embodiment 4.

Detailed description of the invention

Below in conjunction with drawings and Examples, the invention will be further described.

Embodiment 1

As depicted in figs. 1 and 2 there is the self-cleaning in the same way double screw extruder of stretching action, comprise machine barrel 1 and screw mechanism, inner chamber 4 is provided with in described machine barrel 1, described screw mechanism is installed on inner chamber 4, described screw mechanism comprises the first screw rod 2 and the second screw rod 3, described first screw rod 2 and the second screw rod 3 engage each other, and described first screw rod 2 and the second screw rod 3 all tangent with the inwall of inner chamber 4; Described first screw rod 2, second screw rod 3 forms runner with the inner chamber 4 of machine barrel 1; The cross section of described first screw rod 2 and the second screw rod 3 is all for being made up of multistage radius of curvature circular arc not etc., and the first screw rod 2 is different with the cross sectional shape of the second screw rod 3, and the circular arc quantity of two sections is equal; When the first screw rod 2 and the second screw rod 3 rotate, the cross sectional shape cyclically-varying of described runner.Described inner chamber 4 is made up of the cylinder groove that two are communicated with, and the cross sectional shape of inner chamber 4 is in " 8 " word of droping to the ground.

The quantity of the circular arc in the cross section of described first screw rod 2 and the second screw rod 3 is 4 sections, and wherein, 4 sections of circular arcs in the cross section of the first screw rod 2 are respectively L ₁l ₂, L ₂l ₃, L ₃l ₄and L ₄l ₁, and circular arc L ₁l ₂, L ₂l ₃, L ₃l ₄and L ₄l ₁central angle be respectively α ₁₁, β ₁₁, 2 π-α ₁₁-β ₁₁-β ₁₂and β ₁₂, and circular arc L ₃l ₄tangent with inner chamber 4;

Wherein, β ₁₁=β ₁₂, 0< α ₁₁< π-β ₁₁;

4 sections of circular arcs in the cross section of the second screw rod 3 are respectively R ₁r ₂, R ₂r ₃, R ₃r ₄and R ₄r ₁, and circular arc R ₁r ₂, R ₂r ₃, R ₃r ₄and R ₄r ₁respectively with L ₁l ₂, L ₂l ₃, L ₃l ₄and L ₄l ₁coordinate, circular arc R ₁r ₂, R ₂r ₃, R ₃r ₄and R ₄r ₁central angle respectively with L ₁l ₂, L ₂l ₃, L ₃l ₄and L ₄l ₁equal; And circular arc R ₁r ₂tangent with inner chamber 4;

Described first screw rod 2 pivot O ₁with the second screw rod 3 pivot O ₂between distance be C ₁, and the maximum outside diameter of the first screw rod 2 and the second screw rod 3 is D ₁, minimum diameter is d ₁, at circular arc L in described first screw rod 2 ₂l ₃and L ₄l ₁the ventral horn of spiral shell abdomen and the second screw rod 3 in circular arc R ₂r ₃and R ₄r ₁the ventral horn of spiral shell abdomen be η ₁, and η ₁=β ₁₁=β ₁₂, described circular arc L ₁l ₂and L ₃l ₄radius be respectively d ₁/ 2 and D ₁/ 2; Described circular arc L ₁l ₂and L ₃l ₄the center of circle be the pivot O of the first screw rod 2 ₁; Described circular arc L ₂l ₃and L ₄l ₁radius be C ₁, and described circular arc L ₂l ₃the center of circle be L ₂o ₁extended line with O ₁for the center of circle with D ₁/ 2 is the intersection point of the circular arc of radius; Described circular arc L ₄l ₁the center of circle be L ₁o ₁extended line with O ₁for the center of circle with D ₁/ 2 is the intersection point of the circular arc of radius;

Described circular arc R ₁r ₂and R ₃r ₄radius be respectively D ₁/ 2 and d ₁/ 2; Described circular arc R ₁r ₂and R ₃r ₄the center of circle be the pivot O of the second screw rod 3 ₂; Described circular arc R ₂r ₃and R ₄r ₁radius be C ₁, and described circular arc R ₂r ₃the center of circle be R ₃o ₂extended line with O ₂for the center of circle with D ₁/ 2 is the intersection point of the circular arc of radius; Described circular arc R ₄r ₁the center of circle be R ₄o ₂extended line with O ₂for the center of circle with D ₁/ 2 is the intersection point of the circular arc of radius.D simultaneously ₁/ d ₁the pitch of the=1.1 ~ 5.5, first screw rod 2 and the second screw rod 3 is 0.01 ~ 100D ₁.

Described first screw rod 2 and the second screw rod 3 are one start screw screw rod.

Described have the self-cleaning in the same way double screw extruder of stretching action and also comprise the first pulsing mechanism 5 and the second pulsing mechanism 10, and described machine barrel 1 is provided with transportation section 15, melt zone 16, exhaust section 17 and mixing extrusion section 18; Described transportation section 15, melt zone 16, exhaust section 17 and mixing extrusion section 18 are arranged in order from the moving direction of processed material; Be provided with the charging aperture 19 be communicated with inner chamber 4 above described transportation section 15, above described exhaust section 17, be provided with the exhaust outlet 21 with inner space; The first lancing door 9 be communicated with inner chamber 4 is provided with below described exhaust section 17; Described first pulsing mechanism 5 is installed on below exhaust section 17, and described first pulsing mechanism 5 inserts the first lancing door 9; The end of described mixing extrusion section 18 is provided with discharging opening 21; The second lancing door 14 be communicated with inner chamber 4 is provided with below described mixing extrusion section 18; Described second pulsing mechanism 10 is installed on below mixing extrusion section 18, and the second described pulsing mechanism 10 inserts the second lancing door 14.

Described first pulsing mechanism 5 comprises the first eccentric wheel 6, first rotating shaft 8 and the first rod member 7, described first eccentric wheel 6 is installed on below exhaust section 15 by the first rotating shaft 8, the lower end of the first rod member 7 is provided with the first outer rim 71, and the upper end of described first eccentric wheel 6 is withstood below the first outer rim 71; The first lancing door 9 is inserted in the upper end of described first rod member 7; The first eccentric wheel 6 is driven to rotate, then the first rod member 7 is subject to the effect of the first eccentric wheel 6 and moves back and forth up and down, thus stretching action and axial backmixing effect are produced to the material of the melt in the runner of exhaust section 15, therefore the gas that can accelerate in the material of melt is discharged from exhaust outlet 21, between the first screw rod 2, second screw rod 3 and the first rod member 7, wiping achieves self-cleaning action mutually simultaneously.

Described second pulsing mechanism 10 comprises the second eccentric wheel 11, second rotating shaft 13 and the second rod member 12, described second eccentric wheel 11 is installed on below mixing extrusion section 18 by the second rotating shaft 13, the lower end of described second rod member 12 is provided with the second outer rim 121, and the upper end of described second eccentric wheel 11 is withstood below the second outer rim 121; The second lancing door 14 is inserted in the upper end of described second rod member 12.In like manner, the second eccentric wheel 11 is driven to rotate, then the second rod member 12 is subject to the effect of the second eccentric wheel 11 and moves back and forth up and down, thus stretching action and axial backmixing effect are produced to the material of the melt in the runner of mixing extrusion section 18, then promote the mixing plasticizing of the material of melt, and the material of melt is extruded from discharging opening 21, between the first screw rod 2, second screw rod 3 and the second rod member 12, wiping achieves self-cleaning action mutually simultaneously.

Originally there is the processing method of the self-cleaning in the same way double screw extruder of stretching action, comprise the following steps:

(1), after material enters the runner of transportation section 15 from charging aperture 19, the first screw rod 2 and the second screw rod 3 are respectively along respective screw axis constant velocity rotation in the same way; Under the axial positive conveyance power of the first screw rod 2 and the second screw rod 3 and the frictional force acting in conjunction between the first screw rod 2 and the second screw rod 3, realize charging conveying, force material to move to the runner direction of melt zone 16;

(2) when material moves to the runner place of melt zone 16, due to the cross sectional shape cyclically-varying of runner, thus material is compressed and extrudes, then material pre-fusion, and the first screw rod 2 and the second screw rod 3 High Rotation Speed produce frictional heat, make material melt in the external heat acting in conjunction of machine barrel 1 simultaneously; When the rotating in same direction of the first screw rod 2 and the second screw rod 3, accelerate being separated of the material of melt and the material of solid, the cross sectional shape cyclically-varying of described runner and the melting process of the material of the chaotic mixing effect accelerating solid produced, make material become melt;

(3) after the material of melt enters the runner of exhaust section 17 from the runner of melt zone 16, the continuous turning over materials of rotating in same direction of the first screw rod 2 and the second screw rod 3, the first rod member 7 being now installed on the first pulsing mechanism 5 of exhaust section does up and down reciprocatingly vertical motion by the effect of the first eccentric wheel 6, cause the generation of the material periodicity leakage current of melt, then tensile force field action and axial backmixing effect are produced to the material of melt, accelerate gas to discharge from exhaust outlet 20, first screw rod 2, mutual wiping action between second screw rod 3 and the second rod member 6 achieves self-cleaning action, and the material of melt moves to the runner direction of mixing extrusion section 18 further by the effect of the first screw rod 2 and the second screw rod 3,

(4) after the material of melt enters the runner of mixing extrusion section 18, the cross sectional shape cyclically-varying of the runner of mixing extrusion section 18, the then material of the melt effect that is compressed in the runner of mixing extrusion section 18 and extrudes, when moving ahead under the rotating in same direction effect of the first screw rod 2 and the second screw rod 3 simultaneously, the material of the second pulsing mechanism 10 pairs of melts produces tensile force field action and axial backmixing invigoration effect, thus mixing plasticizing is carried out to the material of melt, and make that the material of melt is stable to be extruded from discharging opening; Meanwhile, the mutual wiping action between the first screw rod 2, second spiral shell 3 bar and the second rod member 12 achieves self-cleaning action.

Embodiment 2

As shown in Figure 3, originally there is the self-cleaning in the same way double screw extruder of stretching action except following characteristics with embodiment 1: the quantity of the circular arc in the cross section of described first screw rod 2 and the second screw rod 3 is 10 sections, and wherein, 10 sections of circular arcs in the cross section of the first screw rod 2 are respectively H ₁h ₂, H ₂h ₃, H ₃h ₄, H ₄h ₅, H ₅h ₆, H ₆h ₇, H ₇h ₈, H ₈h ₉, H ₉h ₁₀and H ₁₀h ₁, and circular arc H ₁h ₂, H ₂h ₃, H ₃h ₄, H ₄h ₅, H ₅h ₆, H ₆h ₇, H ₇h ₈, H ₈h ₉, H ₉h ₁₀and H ₁₀h ₁central angle be respectively α ₂₁, β ₂₁, _{γ 21}, β ₂₂, α ₂₂, α ₂₃, β ₂₃, γ ₂₂, β ₂₄and α ₂₄, and circular arc H ₁h ₂, H ₅h ₆, H ₆h ₇and H ₁₀h ₁it is all tangent with inner chamber 4,

Wherein, β ₂₁=β ₂₂=β ₂₃=β ₂₄,

0≤α ₂₃+α ₂₂＜π－（β ₂₁+β ₂₂+β ₂₃+β ₂₄）/2－（γ ₂₁+γ ₂₂）/2，

I.e. 0≤α ₂₃+ α ₂₂< α ₂₁+ α ₂₄; Meanwhile, γ ₂₁+ γ ₂₂>=0;

10 sections of circular arcs in the cross section of the second screw rod 3 are respectively I ₁i ₂, I ₂i ₃, I ₃i ₄, I ₄i ₅, I ₅i ₆, I ₆i ₇, I ₇i ₈, I ₈i ₉, I ₉i ₁₀and I ₁₀i ₁, and circular arc I ₁i ₂, I ₂i ₃, I ₃i ₄, I ₄i ₅, I ₅i ₆, I ₆i ₇, I ₇i ₈, I ₈i ₉, I ₉i ₁₀and I ₁₀i ₁respectively with circular arc H ₁h ₂, H ₂h ₃, H ₃h ₄, H ₄h ₅, H ₅h ₆, H ₆h ₇, H ₇h ₈, H ₈h ₉, H ₉h ₁₀and H ₁₀h ₁coordinate, meanwhile, described circular arc I ₁i ₂, I ₂i ₃, I ₃i ₄, I ₄i ₅, I ₅i ₆, I ₆i ₇, I ₇i ₈, I ₈i ₉, I ₉i ₁₀and I ₁₀i ₁central angle respectively with H ₁h ₂, H ₂h ₃, H ₃h ₄, H ₄h ₅, H ₅h ₆, H ₆h ₇, H ₇h ₈, H ₈h ₉, H ₉h ₁₀and H ₁₀h ₁equal; And circular arc I ₃i ₄and I ₈i ₉all tangent with inner chamber;

Described first screw rod 2 pivot O ₁with the second screw rod 3 pivot O ₂between distance be C ₂, and the maximum outside diameter of the first screw rod 2 and the second screw rod 3 is D ₂, minimum diameter is d ₂, at circular arc H in described first screw rod 2 ₂h ₃, H ₄h ₅, H ₇h ₈and H ₉h ₁₀the ventral horn of spiral shell abdomen and the second screw rod 3 at circular arc I ₂i ₃, I ₄i ₅, I ₇i ₈and I ₉i ₁₀the ventral horn of spiral shell abdomen be _{η 2}, and _{η 2}=β ₂₁=β ₂₂=β ₂₃=β ₂₄, described circular arc H ₁h ₂, H ₅h ₆, H ₆h ₇and H ₁₀h ₁radius be D ₂/ 2; Described H ₃h ₄and H ₈h ₉radius be d ₂/ 2; And described H ₁h ₂, H ₃h ₄, H ₅h ₆, H ₆h ₇, H ₈h ₉and H ₁₀h ₁the center of circle is the pivot O of the first screw rod 2 ₁, described circular arc H ₂h ₃, H ₄h ₅, H ₇h ₈and H ₉h ₁₀radius be C ₂, described circular arc H ₂h ₃the center of circle be H ₃o ₁extended line with O ₁for the center of circle with D ₂/ 2 is the intersection point of the circular arc of radius; Described circular arc H ₄h ₅the center of circle be H ₄o ₁extended line with O ₁for the center of circle with D ₂/ 2 is the intersection point of the circular arc of radius; Described circular arc H ₇h ₈the center of circle be H ₈o ₁extended line with O ₁for the center of circle with D ₂/ 2 is the intersection point of the circular arc of radius; Described circular arc H ₉h ₁₀the center of circle be H ₉o ₁extended line with O ₁for the center of circle with D ₂/ 2 is the intersection point of the circular arc of radius;

Described circular arc I ₃i ₄and I ₈i ₉radius be D ₂/ 2; Described I ₁i ₂, I ₅i ₆, I ₆i ₇and I ₁₀i ₁radius be d ₂/ 2; And described I ₁i ₂, I ₃i ₄, I ₅i ₆, I ₆i ₇, I ₈i ₉and I ₁₀i ₁the center of circle is the pivot O of the second screw rod 3 ₂, described circular arc I ₂i ₃, I ₄i ₅, I ₇i ₈and I ₉i ₁₀radius be C ₂, described circular arc I ₂i ₃the center of circle be I ₂o ₂extended line with O ₂for the center of circle with D ₂/ 2 is the intersection point of the circular arc of radius; Described circular arc I ₄i ₅the center of circle be I ₅o ₂extended line with O ₂for the center of circle with D ₂/ 2 is the intersection point of the circular arc of radius; Described circular arc I ₇i ₈the center of circle be I ₇o ₂extended line with O ₂for the center of circle with D ₂/ 2 is the intersection point of the circular arc of radius; Described circular arc I ₉i ₁₀the center of circle be I ₁₀o ₂extended line with O ₂for the center of circle with D ₂/ 2 is the intersection point of the circular arc of radius.

Described first screw rod 2 and the second screw rod 3 are two-thread worm.

Embodiment 3

As shown in Figure 4, originally there is the self-cleaning in the same way double screw extruder of stretching action except following characteristics with embodiment 1: the quantity of the circular arc in the cross section of described first screw rod 2 and the second screw rod 3 is 7 sections, and wherein, 7 sections of circular arcs in the cross section of the first screw rod 2 are respectively M ₁m ₂, M ₂m ₃, M ₃m ₄, M ₄m ₅, M ₅m ₆, M ₆m ₇and M ₇m ₁, and circular arc M ₁m ₂, M ₂m ₃, M ₃m ₄, M ₄m ₅, M ₅m ₆, M ₆m ₇and M ₇m ₁central angle be respectively α ₃₁, β ₃₁, γ ₃₂, ε ₃₁, ε ₃₂, γ ₃₁and β ₃₂, and circular arc M ₁m ₂tangent with inner chamber 4;

Wherein, β ₃₁=β ₃₂, ε ₃₁=ε ₃₂,

0＜α ₃₁＜π－（β ₃₁+β ₃₂）/2－γ ₃₂/2－ε ₃₁/2－ε ₃₂/2，

That is, 0 < α ₃₁< γ ₃₁;

7 sections of circular arcs in the cross section of the second screw rod 3 are respectively N ₁n ₂, N ₂n ₃, N ₃n ₄, N ₄n ₅, N ₅n ₆, N ₆n ₇and N ₇n ₁, described circular arc N ₁n ₂, N ₂n ₃, N ₃n ₄, N ₄n ₅, N ₅n ₆, N ₆n ₇and N ₇n ₁respectively with circular arc M ₁m ₂, M ₂m ₃, M ₃m ₄, M ₄m ₅, M ₅m ₆, M ₆m ₇and M ₇m ₁coordinate, and circular arc N ₁n ₂, N ₂n ₃, N ₃n ₄, N ₄n ₅, N ₅n ₆, N ₆n ₇and N ₇n ₁central angle respectively with M ₁m ₂, M ₂m ₃, M ₃m ₄, M ₄m ₅, M ₅m ₆, M ₆m ₇and M ₇m ₁equal; And circular arc N ₃n ₄and N ₆n ₇all tangent with inner chamber;

The pivot O of described first screw rod 2 ₁with the pivot O of the second screw rod 3 ₂between distance be C ₃, the maximum outside diameter of the first screw rod 2 and the second screw rod 3 is D ₃, minimum diameter is d ₃, described circular arc M ₄m ₅with M ₅m ₆between intersection point M ₅be d with being positioned at diameter ₃₀circle on, and d ₃< d ₃₀< D ₃; At circular arc M in described first screw rod 2 ₂m ₃and M ₇m ₁the ventral horn of spiral shell abdomen and the second screw rod 3 at circular arc N ₂n ₃and N ₇n ₁the ventral horn of spiral shell abdomen be η ₃, and η ₃=β ₃₁=β ₃₂, at circular arc M in described first screw rod 2 ₄m ₅and M ₅m ₆the ventral horn of spiral shell abdomen and the second screw rod 3 at circular arc N ₄n ₅and N ₅n ₆the ventral horn of spiral shell abdomen be η ₄, and ${\mathrm{\&eta;}}_4=\mathrm{\&pi;}-\arccos \left(\frac{{D_3}^2+d_{30}-{{4C}_3}^2}{{2D}_3{d}_{30}}\right);$

Described circular arc M ₁m ₂radius be D ₃/ 2; Described M ₃m ₄and M ₆m ₇radius be d ₃/ 2; And described M ₁m ₂, M ₃m ₄and M ₆m ₇the center of circle is the pivot O of the first screw rod 2 ₁, described circular arc M ₂m ₃, M ₄m ₅, M ₅m ₆and M ₇m ₁radius be C ₃, described circular arc M ₂m ₃the center of circle be M ₃o ₁extended line with O ₁for the center of circle with D ₃/ 2 is the intersection point of the circular arc of radius; Described circular arc M ₄m ₅the center of circle be M ₄o ₁extended line with O ₁for the center of circle with D ₃/ 2 is the intersection point of the circular arc of radius; Described circular arc M ₅m ₆the center of circle be M ₆o ₁extended line with O ₁for the center of circle with D ₃/ 2 is the intersection point of the circular arc of radius; Described circular arc M ₇m ₁the center of circle be M ₇o ₁extended line with O ₁for the center of circle with D ₃/ 2 is the intersection point of the circular arc of radius;

Described circular arc N ₃n ₄and N ₆n ₇radius be D ₃/ 2; Described N ₁n ₂radius be d ₃/ 2; And described N ₁n ₂, N ₃n ₄and N ₆n ₇the center of circle is the pivot O of the second screw rod 3 ₂, described circular arc N ₂n ₃, N ₄n ₅, N ₅n ₆and N ₇n ₁radius be C ₃, described circular arc N ₂n ₃the center of circle be N ₂o ₂extended line with O ₂for the center of circle with D ₃/ 2 is the intersection point of the circular arc of radius; Described circular arc N ₄n ₅the center of circle be N ₅o ₂extended line with O ₂for the center of circle with D ₃/ 2 is the intersection point of the circular arc of radius; Described circular arc N ₅n ₆the center of circle be N ₅o ₂extended line with O ₂for the center of circle with D ₃/ 2 is the intersection point of the circular arc of radius; Described circular arc N ₇n ₁the center of circle be N ₁o ₂extended line with O ₂for the center of circle with D ₃/ 2 is the intersection point of the circular arc of radius.

The number of starts of described first screw rod 2 and the second screw rod 3 is non-integer dimension.

Embodiment 4

As shown in Figure 5, originally there is the self-cleaning in the same way double screw extruder of stretching action except following characteristics with embodiment 3: the quantity of the circular arc in the cross section of described first screw rod 2 and the second screw rod 3 is 6 sections, and wherein, 7 sections of circular arcs in the cross section of the first screw rod 2 are respectively J ₁j ₂, J ₂j ₃, J ₃j ₄, J ₄j ₅, J ₅j ₆and J ₆j ₁, and circular arc J ₁j ₂, J ₂j ₃, J ₃j ₄, J ₄j ₅, J ₅j ₆and J ₆j ₁central angle be respectively α ₄₁, θ ₄₁, _{γ 41}, δ ₄₁, ε ₄₁and β ₄₁, and circular arc J ₁j ₂tangent with inner chamber 4;

Wherein, 0 < α ₄₁< π-β ₄₁/ 2-θ ₄₁/ 2-δ ₄₁/ 2-γ ₄₁/ 2, i.e. 0 < α ₄₁< ε ₄₁,

6 sections of circular arcs in the cross section of the second screw rod 3 are respectively K ₁k ₂, K ₂k ₃, K ₃k ₄, K ₄k ₅, K ₅k ₆and K ₆k ₁, described circular arc K ₁k ₂, K ₂k ₃, K ₃k ₄, K ₄k ₅, K ₅k ₆and K ₆k ₁respectively with circular arc M ₁m ₂, M ₂m ₃, J ₁j ₂, J ₂j ₃, J ₃j ₄, J ₄j ₅, J ₅j ₆and J ₆j ₁coordinate, and circular arc K ₁k ₂, K ₂k ₃, K ₃k ₄, K ₄k ₅, K ₅k ₆and K ₆k ₁central angle respectively with J ₁j ₂, J ₂j ₃, J ₃j ₄, J ₄j ₅, J ₅j ₆and J ₆j ₁equal; Circular arc K ₅k ₆tangent with inner chamber 4;

The pivot O of described first screw rod 2 ₁with the pivot O of the second screw rod 3 ₂between distance be C ₄, and the maximum outside diameter of the first screw rod 2 and the second screw rod 3 is D ₄, minimum diameter is d ₄, described circular arc K ₃k ₄two end points K ₃, K ₄be all d at diameter ₄₀circle on, and d ₄< d ₄₀< D ₄, at circular arc J in described first screw rod 2 ₆j ₁the ventral horn of spiral shell abdomen and the second screw rod 3 at circular arc K ₆k ₁the ventral horn of spiral shell abdomen is η ₅, and η ₅=β ₄₁, at circular arc J in described first screw rod 2 ₂j ₃the ventral horn of spiral shell abdomen and the second screw rod 3 at circular arc K ₂k ₃the ventral horn of spiral shell abdomen is _{η 6}, and at circular arc J in described first screw rod 2 ₄j ₅the ventral horn of spiral shell abdomen and the second screw rod 3 at circular arc K ₄k ₅the ventral horn of spiral shell abdomen is η ₇, and

Described circular arc J ₁j ₂radius be D ₄/ 2; Described J ₃j ₄and J ₅j ₆radius be respectively C ₄-d ₄₀/ 2 and d ₄/ 2; And described J ₃j ₄and J ₅j ₆the center of circle is the pivot O of the first screw rod 2 ₁, described circular arc J ₂j ₃, J ₄j ₅and J ₆j ₁radius be C ₄, described circular arc J ₂j ₃the center of circle be J ₃o ₁extended line with O ₁for the center of circle with D ₄/ 2 is the intersection point of the circular arc of radius; Described circular arc J ₄j ₅the center of circle be J ₅o ₁extended line with O ₁for the center of circle with D ₄/ 2 is the intersection point of the circular arc of radius; Described circular arc J ₆j ₁the center of circle be J ₆o ₁extended line with O ₁for the center of circle with D ₄/ 2 is the intersection point of the circular arc of radius;

Described circular arc K ₅k ₆radius be D ₄/ 2; Described K ₁k ₂and K ₃k ₄radius be respectively d ₄/ 2 and d ₄₀/ 2; And described K ₁k ₂, K ₅k ₆and K ₃k ₄the center of circle is the pivot O of the second screw rod 3 ₂, described circular arc K ₂k ₃, K ₄k ₅and K ₆k ₁radius be C ₄, described circular arc K ₂k ₃center of circle K ₂o ₂extended line with O ₂for the center of circle with D ₄/ 2 is the intersection point of the circular arc of radius; Described circular arc K ₄k ₅the center of circle be K ₄o ₂extended line with O ₂for the center of circle with D ₄/ 2 is the intersection point of the circular arc of radius; Described circular arc K ₆k ₁the center of circle be K ₁o ₂extended line with O ₂for the center of circle with D ₄/ 2 is the intersection point of the circular arc of radius.

The number of starts of described first screw rod 2 and the second screw rod 3 is non-integer dimension between 1 and 2.

Above-mentioned detailed description of the invention is the preferred embodiments of the present invention, can not limit the present invention, and any of other does not deviate from technical scheme of the present invention and the substitute mode of the change made or other equivalence, is included within protection scope of the present invention.

Claims (9)

1. there is the self-cleaning in the same way double screw extruder of stretching action, comprise machine barrel and screw mechanism, inner chamber is provided with in described machine barrel, described screw mechanism is installed on inner chamber, described screw mechanism comprises the first screw rod and the second screw rod, described first screw rod and the second screw rod engage each other, and described first screw rod and the second screw rod are all tangent with the inwall of inner chamber; The inner chamber of described first screw rod, the second screw rod and machine barrel forms runner; It is characterized in that: the cross section of described first screw rod and the second screw rod is all for being made up of multistage radius of curvature circular arc not etc., and the first screw rod is different with the cross sectional shape of the second screw rod, and the circular arc quantity of two sections is equal; When the first screw rod and the second bolt rotary, the cross sectional shape cyclically-varying of described runner;

Also comprise the first pulsing mechanism and the second pulsing mechanism, described machine barrel is provided with transportation section, melt zone, exhaust section and mixing extrusion section; Described transportation section, melt zone, exhaust section and mixing extrusion section are arranged in order from the moving direction of processed material; Be provided with the charging aperture with inner space above described transportation section, above described exhaust section, be provided with the exhaust outlet with inner space; The first lancing door with inner space is provided with below described exhaust section; Described first pulsing mechanism is installed on below exhaust section, and described first pulsing mechanism inserts the first lancing door; The end of described mixing extrusion section is provided with discharging opening; The second lancing door with inner space is provided with below described mixing extrusion section; Described second pulsing mechanism is installed on below mixing extrusion section, and the second described pulsing mechanism inserts the second lancing door;

Described first pulsing mechanism comprises the first eccentric wheel, the first rotating shaft and the first rod member, described first eccentric wheel is installed on below exhaust section by the first rotating shaft, the lower end of the first rod member is provided with the first outer rim, and described first eccentric upper end is withstood below the first outer rim; The first lancing door is inserted in the upper end of described first rod member;

Described second pulsing mechanism comprises the second eccentric wheel, the second rotating shaft and the second rod member, described second eccentric wheel is installed on below mixing extrusion section by the second rotating shaft, the lower end of described second rod member is provided with the second outer rim, and described second eccentric upper end is withstood below the second outer rim; The second lancing door is inserted in the upper end of described second rod member.

2. according to claim 1 have the self-cleaning in the same way double screw extruder of stretching action, it is characterized in that: the quantity of the circular arc in the cross section of described first screw rod is 4 to 10 sections.

3. according to claim 1 have the self-cleaning in the same way double screw extruder of stretching action, it is characterized in that: the quantity of the circular arc in the cross section of described first screw rod and the second screw rod is 4 sections, and wherein, 4 sections of circular arcs in the cross section of the first screw rod are respectively L ₁l ₂, L ₂l ₃, L ₃l ₄and L ₄l ₁, and circular arc L ₁l ₂, L ₂l ₃, L ₃l ₄and L ₄l ₁central angle be respectively α ₁₁, β ₁₁, 2 π-α ₁₁-β ₁₁-β ₁₂and β ₁₂, and circular arc L ₃l ₄tangent with inner chamber;

Wherein, β ₁₁=β ₁₂, 0< α ₁₁< π-β ₁₁;

4 sections of circular arcs in the cross section of the second screw rod are respectively R ₁r ₂, R ₂r ₃, R ₃r ₄and R ₄r ₁, and circular arc R ₁r ₂, R ₂r ₃, R ₃r ₄and R ₄r ₁respectively with L ₁l ₂, L ₂l ₃, L ₃l ₄and L ₄l ₁coordinate, circular arc R ₁r ₂, R ₂r ₃, R ₃r ₄and R ₄r ₁central angle respectively with L ₁l ₂, L ₂l ₃, L ₃l ₄and L ₄l ₁equal; And circular arc R ₁r ₂tangent with inner chamber;

Described first screw rod pivot O ₁with the second screw rod pivot O ₂between distance be C ₁, and the maximum outside diameter of the first screw rod and the second screw rod is D ₁, minimum diameter is d ₁, at circular arc L in described first screw rod ₂l ₃and L ₄l ₁the ventral horn of spiral shell abdomen and the second screw rod in circular arc R ₂r ₃and R ₄r ₁the ventral horn of spiral shell abdomen be η ₁, and η ₁=β ₁₁=β ₁₂, described circular arc L ₁l ₂and L ₃l ₄radius be respectively d ₁/ 2 and D ₁/ 2; Described circular arc L ₁l ₂and L ₃l ₄the center of circle be the pivot O of the first screw rod ₁; Described circular arc L ₂l ₃and L ₄l ₁radius be C ₁, and described circular arc L ₂l ₃the center of circle be L ₂o ₁extended line with O ₁for the center of circle with D ₁/ 2 is the intersection point of the circular arc of radius; Described circular arc L ₄l ₁the center of circle be L ₁o ₁extended line with O ₁for the center of circle with D ₁/ 2 is the intersection point of the circular arc of radius;

Described circular arc R ₁r ₂and R ₃r ₄radius be respectively D ₁/ 2 and d ₁/ 2; Described circular arc R ₁r ₂and R ₃r ₄the center of circle be the pivot O of the second screw rod ₂; Described circular arc R ₂r ₃and R ₄r ₁radius be C ₁, and described circular arc R ₂r ₃the center of circle be R ₃o ₂extended line with O ₂for the center of circle with D ₁/ 2 is the intersection point of the circular arc of radius; Described circular arc R ₄r ₁the center of circle be R ₄o ₂extended line with O ₂for the center of circle with D ₁/ 2 is the intersection point of the circular arc of radius.

4. according to claim 3 have the self-cleaning in the same way double screw extruder of stretching action, it is characterized in that: described first screw rod and the second screw rod are one start screw screw rod.

5. according to claim 1 have the self-cleaning in the same way double screw extruder of stretching action, it is characterized in that: the quantity of the circular arc in the cross section of described first screw rod and the second screw rod is 10 sections, and wherein, 10 sections of circular arcs in the cross section of the first screw rod are respectively H ₁h ₂, H ₂h ₃, H ₃h ₄, H ₄h ₅, H ₅h ₆, H ₆h ₇, H ₇h ₈, H ₈h ₉, H ₉h ₁₀and H ₁₀h ₁, and circular arc H ₁h ₂, H ₂h ₃, H ₃h ₄, H ₄h ₅, H ₅h ₆, H ₆h ₇, H ₇h ₈, H ₈h ₉, H ₉h ₁₀and H ₁₀h ₁central angle be respectively α ₂₁, β ₂₁, γ ₂₁, β ₂₂, α ₂₂, α ₂₃, β ₂₃, γ ₂₂, β ₂₄and α ₂₄, and circular arc H ₁h ₂, H ₅h ₆, H ₆h ₇and H ₁₀h ₁it is all tangent with inner chamber,

Wherein, β ₂₁=β ₂₂=β ₂₃=β ₂₄,

0≤α ₂₃+α ₂₂＜π－(β ₂₁+β ₂₂+β ₂₃+β ₂₄)/2－(γ ₂₁+γ ₂₂)/2，

I.e. 0≤α ₂₃+ α ₂₂< α ₂₁+ α ₂₄; Meanwhile, γ ₂₁+ γ ₂₂>=0;

10 sections of circular arcs in the cross section of the second screw rod are respectively I ₁i ₂, I ₂i ₃, I ₃i ₄, I ₄i ₅, I ₅i ₆, I ₆i ₇, I ₇i ₈, I ₈i ₉, I ₉i ₁₀and I ₁₀i ₁, and circular arc I ₁i ₂, I ₂i ₃, I ₃i ₄, I ₄i ₅, I ₅i ₆, I ₆i ₇, I ₇i ₈, I ₈i ₉, I ₉i ₁₀and I ₁₀i ₁respectively with circular arc H ₁h ₂, H ₂h ₃, H ₃h ₄, H ₄h ₅, H ₅h ₆, H ₆h ₇, H ₇h ₈, H ₈h ₉, H ₉h ₁₀and H ₁₀h ₁coordinate, meanwhile, described circular arc I ₁i ₂, I ₂i ₃, I ₃i ₄, I ₄i ₅, I ₅i ₆, I ₆i ₇, I ₇i ₈, I ₈i ₉, I ₉i ₁₀and I ₁₀i ₁central angle respectively with H ₁h ₂, H ₂h ₃, H ₃h ₄, H ₄h ₅, H ₅h ₆, H ₆h ₇, H ₇h ₈, H ₈h ₉, H ₉h ₁₀and H ₁₀h ₁equal; And circular arc I ₃i ₄and I ₈i ₉all tangent with inner chamber;

Described first screw rod pivot O ₁with the second screw rod pivot O ₂between distance be C ₂, and the maximum outside diameter of the first screw rod and the second screw rod is D ₂, minimum diameter is d ₂, at circular arc H in described first screw rod ₂h ₃, H ₄h ₅, H ₇h ₈and H ₉h ₁₀the ventral horn of spiral shell abdomen and the second screw rod at circular arc I ₂i ₃, I ₄i ₅, I ₇i ₈and I ₉i ₁₀the ventral horn of spiral shell abdomen be η ₂, and η ₂=β ₂₁=β ₂₂=β ₂₃=β ₂₄, described circular arc H ₁h ₂, H ₅h ₆, H ₆h ₇and H ₁₀h ₁radius be D ₂/ 2; Described H ₃h ₄and H ₈h ₉radius be d ₂/ 2; And described H ₁h ₂, H ₃h ₄, H ₅h ₆, H ₆h ₇, H ₈h ₉and H ₁₀h ₁the center of circle is the pivot O of the first screw rod ₁, described circular arc H ₂h ₃, H ₄h ₅, H ₇h ₈and H ₉h ₁₀radius be C ₂, described circular arc H ₂h ₃the center of circle be H ₃o ₁extended line with O ₁for the center of circle with D ₂/ 2 is the intersection point of the circular arc of radius; Described circular arc H ₄h ₅the center of circle be H ₄o ₁extended line with O ₁for the center of circle with D ₂/ 2 is the intersection point of the circular arc of radius; Described circular arc H ₇h ₈the center of circle be H ₈o ₁extended line with O ₁for the center of circle with D ₂/ 2 is the intersection point of the circular arc of radius; Described circular arc H ₉h ₁₀the center of circle be H ₉o ₁extended line with O ₁for the center of circle with D ₂/ 2 is the intersection point of the circular arc of radius;

Described circular arc I ₃i ₄and I ₈i ₉radius be D ₂/ 2; Described I ₁i ₂, I ₅i ₆, I ₆i ₇and I ₁₀i ₁radius be d ₂/ 2; And described I ₁i ₂, I ₃i ₄, I ₅i ₆, I ₆i ₇, I ₈i ₉and I ₁₀i ₁the center of circle is the pivot O of the second screw rod ₂, described circular arc I ₂i ₃, I ₄i ₅, I ₇i ₈and I ₉i ₁₀radius be C ₂, described circular arc I ₂i ₃the center of circle be I ₂o ₂extended line with O ₂for the center of circle with D ₂/ 2 is the intersection point of the circular arc of radius; Described circular arc I ₄i ₅the center of circle be I ₅o ₂extended line with O ₂for the center of circle with D ₂/ 2 is the intersection point of the circular arc of radius; Described circular arc I ₇i ₈the center of circle be I ₇o ₂extended line with O ₂for the center of circle with D ₂/ 2 is the intersection point of the circular arc of radius; Described circular arc I ₉i ₁₀the center of circle be I ₁₀o ₂extended line with O ₂for the center of circle with D ₂/ 2 is the intersection point of the circular arc of radius.

6. according to claim 5 have the self-cleaning in the same way double screw extruder of stretching action, it is characterized in that: described first screw rod and the second screw rod are two-thread worm.

7. according to claim 1 have the self-cleaning in the same way double screw extruder of stretching action, it is characterized in that: the quantity of the circular arc in the cross section of described first screw rod and the second screw rod is 7 sections, wherein, the first screw rod 7 sections, cross section circular arc be respectively M ₁m ₂, M ₂m ₃, M ₃m ₄, M ₄m ₅, M ₅m ₆, M ₆m ₇and M ₇m ₁, and circular arc M ₁m ₂, M ₂m ₃, M ₃m ₄, M ₄m ₅, M ₅m ₆, M ₆m ₇and M ₇m ₁central angle be respectively α ₃₁, β ₃₁, γ ₃₂, ε ₃₁, ε ₃₂, γ ₃₁and β ₃₂, and circular arc M ₁m ₂tangent with inner chamber 4;

Wherein, β ₃₁=β ₃₂, ε ₃₁=ε ₃₂,

0＜α ₃₁＜π－(β ₃₁+β ₃₂)/2－γ ₃₂/2－ε ₃₁/2－ε ₃₂/2，

That is, 0 < α ₃₁< γ ₃₁;

7 sections of circular arcs in the cross section of the second screw rod are respectively N ₁n ₂, N ₂n ₃, N ₃n ₄, N ₄n ₅, N ₅n ₆, N ₆n ₇and N ₇n ₁, described circular arc N ₁n ₂, N ₂n ₃, N ₃n ₄, N ₄n ₅, N ₅n ₆, N ₆n ₇and N ₇n ₁respectively with circular arc M ₁m ₂, M ₂m ₃, M ₃m ₄, M ₄m ₅, M ₅m ₆, M ₆m ₇and M ₇m ₁coordinate, and circular arc N ₁n ₂, N ₂n ₃, N ₃n ₄, N ₄n ₅, N ₅n ₆, N ₆n ₇and N ₇n ₁central angle respectively with M ₁m ₂, M ₂m ₃, M ₃m ₄, M ₄m ₅, M ₅m ₆, M ₆m ₇and M ₇m ₁equal; And circular arc N ₃n ₄and N ₆n ₇all tangent with inner chamber;

The pivot O of described first screw rod ₁with the pivot O of the second screw rod ₂between distance be C ₃, and the maximum outside diameter of the first screw rod and the second screw rod is D ₃, minimum diameter is d ₃, described circular arc M ₄m ₅with M ₅m ₆between intersection point M ₅be d with being positioned at diameter ₃₀circle on, and d ₃< d ₃₀< D ₃; At circular arc M in described first screw rod ₂m ₃and M ₇m ₁the ventral horn of spiral shell abdomen and the second screw rod at circular arc N ₂n ₃and N ₇n ₁the ventral horn of spiral shell abdomen be η ₃, and η ₃=β ₃₁=β ₃₂, at circular arc M in described first screw rod ₄m ₅and M ₅m ₆the ventral horn of spiral shell abdomen and the second screw rod at circular arc N ₄n ₅and N ₅n ₆the ventral horn of spiral shell abdomen be η ₄, and ${\mathrm{\&eta;}}_4=\mathrm{\&pi;}-\arccos \left(\frac{{D_3}^2+d_{30}-{{4C}_3}^2}{{2D}_3{d}_{30}}\right);$

Described circular arc M ₁m ₂radius be D ₃/ 2; Described M ₃m ₄and M ₆m ₇radius be d ₃/ 2; And described M ₁m ₂, M ₃m ₄and M ₆m ₇the center of circle is the pivot O of the first screw rod ₁, described circular arc M ₂m ₃, M ₄m ₅, M ₅m ₆and M ₇m ₁radius be C ₃, described circular arc M ₂m ₃the center of circle be M ₃o ₁extended line with O ₁for the center of circle with D ₃/ 2 is the intersection point of the circular arc of radius; Described circular arc M ₄m ₅the center of circle be M ₄o ₁extended line with O ₁for the center of circle with D ₃/ 2 is the intersection point of the circular arc of radius; Described circular arc M ₅m ₆the center of circle be M ₆o ₁extended line with O ₁for the center of circle with D ₃/ 2 is the intersection point of the circular arc of radius; Described circular arc M ₇m ₁the center of circle be M ₇o ₁extended line with O ₁for the center of circle with D ₃/ 2 is the intersection point of the circular arc of radius;

Described circular arc N ₃n ₄and N ₆n ₇radius be D ₃/ 2; Described N ₁n ₂radius be d ₃/ 2; And described N ₁n ₂, N ₃n ₄and N ₆n ₇the center of circle is the pivot O of the second screw rod ₂, described circular arc N ₂n ₃, N ₄n ₅, N ₅n ₆and N ₇n ₁radius be C ₃, described circular arc N ₂n ₃the center of circle be N ₂o ₂extended line with O ₂for the center of circle with D ₃/ 2 is the intersection point of the circular arc of radius; Described circular arc N ₄n ₅the center of circle be N ₅o ₂extended line with O ₂for the center of circle with D ₃/ 2 is the intersection point of the circular arc of radius; Described circular arc N ₅n ₆the center of circle be N ₅o ₂extended line with O ₂for the center of circle with D ₃/ 2 is the intersection point of the circular arc of radius; Described circular arc N ₇n ₁the center of circle be N ₁o ₂extended line with O ₂for the center of circle with D ₃/ 2 is the intersection point of the circular arc of radius.

8. according to claim 7 have the self-cleaning in the same way double screw extruder of stretching action, it is characterized in that: described first screw rod and the second screw flight head number are non-integer dimension.

9. the processing method with the self-cleaning in the same way double screw extruder of stretching action according to claim 1, is characterized in that, comprise the following steps:

(1), after material enters the runner of transportation section from charging aperture, the first screw rod and the second screw rod are respectively along respective screw axis constant velocity rotation in the same way; Under the axial positive conveyance power of the first screw rod and the second screw rod and the frictional force acting in conjunction between the first screw rod and the second screw rod, realize charging conveying, force material to move to the runner direction of melt zone;

(2) when material moves to the runner place of melt zone, due to the cross sectional shape cyclically-varying of runner, thus material is compressed and extrudes, then material pre-fusion, and the first screw rod and the second screw rod High Rotation Speed produce frictional heat, make material melt in the external heat acting in conjunction of machine barrel simultaneously; When the rotating in same direction of the first screw rod and the second screw rod, accelerate being separated of the material of melt and the material of solid, the cross sectional shape cyclically-varying of described runner and the melting process of the material of the chaotic mixing effect accelerating solid produced, make material become melt;

(3) after the material of melt enters the runner of exhaust section from the runner of melt zone, the continuous turning over materials of rotating in same direction of the first screw rod and the second screw rod, the first rod member being now installed on the first pulsing mechanism of exhaust section does up and down reciprocatingly vertical motion by the first eccentric effect, cause the generation of the material periodicity leakage current of melt, then tensile force field action and axial backmixing effect are produced to the material of melt, accelerate gas to discharge from exhaust outlet, first screw rod, mutual wiping action between second screw rod and the second rod member achieves self-cleaning action, and the material of melt moves to the runner direction of mixing extrusion section further by the effect of the first screw rod and the second screw rod,

(4) after the material of melt enters the runner of mixing extrusion section, the cross sectional shape cyclically-varying of the runner of mixing extrusion section, the then material of the melt effect that is compressed in the runner of mixing extrusion section and extrudes, when moving ahead under the rotating in same direction effect of the first screw rod and the second screw rod simultaneously, second pulsing mechanism produces tensile force field action and axial backmixing invigoration effect to the material of melt, thus mixing plasticizing is carried out to the material of melt, and make that the material of melt is stable to be extruded from discharging opening; Meanwhile, the first screw rod, mutual wiping action between the second screw rod and the second rod member achieve self-cleaning action.