CN2437476Y

CN2437476Y - Pulsating screw with helical worked composite member

Info

Publication number: CN2437476Y
Application number: CN00246314U
Authority: CN
Inventors: 王兴天; 王守信
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-08-09
Filing date: 2000-08-09
Publication date: 2001-07-04
Anticipated expiration: 2010-08-09

Abstract

The utility model provides a pulsating screw rod with a helical worked composite member. The utility model is provided with a screw rod main body, wherein the screw rod main body is provided with screw threads, and is successively divided into a head section, a middle section and a tail section, along the length direction. A screw groove of the middle section of the screw rod is provided with a composite member which is helical along the screw groove. A plurality of shear mixing unit gaps in interval shapes are designed and manufactured along the direction of the composite member, and the volumes and the shapes of the gaps can be used for the passing of the materials in the screw groove from one side of the composite member self to the other side. The mixing of the materials can be accelerated by mixing, shearing, stirring and cutting of the gaps, therefore, the process time can be shortened, and the length of the screw rod can be decreased. The production efficiency and the effect of saving energy can be enhanced.

Description

The pulsation screw rod that has helical form processing mixer element

The utility model relates to a kind of high polymer processing equipment, and particularly a kind of plastics that are used for are extruded that processing is used, as to have helical form processing mixer element pulsation screw rod.

At present; it mainly is by rotatable screw rod that all extruders, injector, comminutor, blow moulding machine etc. that is applied in the plastic processing are extruded the class processing equipment; be packaged in the machine barrel of screw rod periphery, the transmission system that drives the screw rod rotation and control system and constitute, the good and bad and height of the quality of converted products, production efficiency, energy consumption then mainly is taken at the selection of screw rod pattern and design parameter thereof.

And the theoretical foundation that the selection of the selection design of screw rod pattern, parameter and designing institute rely on has still been used igneous theory for many years (also claiming the Solid Bed theory) for domestic and international high polymer manufacture field, this traditional theory is thought, the length (L) of screw spiral line part, press its function difference, section (promptly being called feeding section or solid conveying section) headed by beginning to divide in regular turn from feeding mouth to the material effect; Stage casing: (being called melt zone or compression section or fluxing zone); Latter end: (being called extruding zone or homogenizing zone or metering section), referring to Fig. 1.

Traditional theory thinks that plastics are in the stage casing, and promptly the section of dissolving occurs from melt film, along with the increase of thermal history, during the screw rod rotation, just forms the molten bath on the thrust face of its spiral shell rib, another convenient Solid Bed that forms of its adjacent interface.The fusion process of melt zone be Solid Bed volume from big to small, until the process that disappears; And the molten bath is from small to large, until the process that all is full of screw channel.For this reason, along the screw channel cross section, the width X of its Solid Bed is the process that reduces from B → O (B is the width of screw channel); And the width in molten bath (B-X) is the process that is increased by O → B, as shown in Figure 2.Under traditional theory instructed, the structure of melt zone screw rod should keep the released state at Solid Bed and bath the two poles of the earth, and at melt zone, to screw channel is launched, solid phase and liquid phase just have significantly the interface as shown in Figure 3 along Z.According to the screw-rod structure of traditional theory design such as the three-stage screw and the special type BM screw rod of routine, band screw rod etc.In the screw rod stage casing is the screw channel at melt zone screw rod end, all avoid and add other functional elements, to keep the orderly melting process of Solid Bed.And some screw rod designer once repaid and tried to add kneading disk or insert a small amount of pin at the screw rod latter end, so that strengthen homo-effect, but its effect is all undesirable.And in decision plasticizing quality, plasticizing efficiency, the energy-conservation design that accounts for the bigger screw rod stage casing of screw rod total length, do not seen important breakthrough so far as yet.Thereby a kind of low energy consumption, high efficiency, high plasticizing capacity are not arranged in the practical application of extruding class mechanism yet, the high-effect extruder that draw ratio is little occurs.In addition, because the fluxing zone mentality of designing of existing screw rod does not have breakthrough always, effect is limited, more is difficult to be competent at for processing based on the material of the high viscosity of super high molecular weight, multicomponent, high filling modified plastics.

The purpose of this utility model just is to overcome the above-mentioned shortcoming and defect of prior art, in the interlude screw channel of screw rod, move towards design and have helical form to separate the pulsating screw rod of mixer element and provide a kind of along the spiral of screw channel, so that table in the some irregular mixer elements with certain geometrical shape gap that separate that mixer element self was processed to form by this helical form and the machine barrel and formed special-shaped passage, mixing, plasticizing, shearing, the fusion effect of enhancing material in whole stage casing.

It is the Solid Bed igneous theory that the separation mixer element of shape track trend in the shape of a spiral breaks traditions that another purpose of the present utility model just is to use this continuous or spaced apart but general trend, so that stream of solids layer in this section screw channel and fusion materials flow are just upset from starting from eventually always, forming in the solid material infiltration has or clads the fusion materials flow, be impregnated with solid material group and mix in the fusion materials flow, so that strengthen to mix and shear the plastifying fusion effect, simultaneously, help to shorten the interlude spiro rod length, reduce complete machine length, improve difficulty and service behaviour that machine is installed, debugged.

The purpose of this utility model is to realize by following technical scheme, the pulsation screw rod that has helical form processing mixer element, one screw rod body is arranged, the screw rod body be provided with screw thread and divide successively along its length direction headed by section, interlude and latter end, it is characterized in that: design is processed with along screw channel and moves towards the mixer element of shape distribution in the shape of a spiral in the screw channel of screw rod interlude, moves towards design along this mixer element and is processed with interruption-like several shear-mixed unit gap that material is passed through by this mixer element self side direction opposite side in the screw channel that supply.The mixer element of helical form trend is to be made of the thread segment that a spiro edge height is lower than the interlude spiro edge height, cutting downwards is processed with several shear-mixed unit gap on the spiro edge height direction of continuous shape screw thread body.The mixer element of helical form trend be by several at interval mountings be fixed in the interlude screw channel and in the shape of a spiral the independent component arranged of shape be arranged to form.Is triangle or arc or trapezoidal or zigzag by mixer element self thread segment spiral shell rib top to bottom thread root cutting processing and perpendicular to the shape of the mixed cell gap of spiral shell rib normal section.The independent component shape is cylindrical or triangle body or cone or multiple edge body or plate body.The independent component of different shape mixes the mixer element that distribution is set and forms helical form trend along welding in the interlude screw channel.Spiral helicine mixer element constituted, and to move towards the spiral spiral section that has gap volume, variform unit gap be continuous or segmentation is provided with.

The working mechanism of the utility model screw rod is as follows: the unit gap of the various geometries that solid material in the screw channel of screw rod stage casing and melting charge are processed on the continuously mixed workpiece in the screw rod rotation is broken, form solid phase micelle and liquid phase micelle by mixing, shearing, conveying effect, constantly ooze between the two and close, mix, stir, intert, cut apart, make it to contain mutually the uniform two phase flow mixture of formation; And constantly carry out between the micelle of two phase flow energy exchange and mass exchange formation temperature evenly with the uniform two phase flow mixture of combination, among the solid phase micelle all disappears in liquid phase equably, just reach the relative energy and the balance of quality.

Because in the screw channel of screw rod interlude, along Z to the spiral shell rib is set, and on the body of its spiral shell rib, on short transverse, offer different convex-concave gap, make on its normal section perpendicular to the spiral shell rib, constitute plasticizing function element with certain geometrical shape, its geometry can be triangle, square, rectangle, rhombus, semicircle, ellipse, polygon and composite figure as shown in Figure 4 and Figure 5.This melting mechanism greatly improves the uniformity of melt quality, the uniformity of component, the uniformity of molecular weight distribution; Because the uniform melting rate and the melt quality of greatly having improved of temperature and pressure.

Because the hybrid process part has the different cut cells gap that supplies material to pass through of the different geometry of some volumes, will make the two phase flow that passes through produce volume effect, form fluctuation pressure.Strong shearing, extruding that material is subjected to repeatedly by the unit gap reach by relaxing before and after the unit gap, make macromolecular chain under the fluctuation pressure effect, constantly stretch or loose and give appropriateness wait shear force with etc. cut speed, when improving melt quality and melting rate, prevented the molecule chain break, the danger of degraded has taken place; Under the fluctuation pressure effect, material also is difficult for being detained and the adhesion screw surface, has quickened the fusion of plasticizing.

Therefore the utlity model has following advantage:

The utility model provides a kind ofly moves towards design along the spiral of screw channel and has helical form to separate the pulsating screw rod of mixer element in the interlude screw channel of screw rod, table in some irregular mixer elements with certain geometrical shape gap that can separate that mixer element self was processed to form by this helical form and the machine barrel and formed special-shaped passage, mixing, plasticizing, shearing, the fusion effect of enhancing material in whole stage casing.

The pulsating screw rod that the utility model provides, use this continuous or spaced apart but general trend and be the Solid Bed igneous theory that the separation mixer element of shape track trend in the shape of a spiral breaks traditions, stream of solids layer and fusion materials flow in this section screw channel are just upset from starting from eventually always, forming in the solid material infiltration has or clads the fusion materials flow, be impregnated with solid material group and mix in the fusion materials flow, therefore strengthen to mix and shear the plastifying fusion effect, simultaneously, help to shorten the interlude spiro rod length, reduce complete machine length, improve machine and install, the difficulty and the service behaviour of debugging.

Concrete structure of the present utility model is realized by following drawings and Examples.

Fig. 1 is the structural representation of existing screw rod.

Material was along the distribution schematic diagram of N-N ' section when Fig. 2 was a screw rod processing materials shown in Figure 1.

Fig. 3 during for screw rod processing materials shown in Figure 1 material move towards the Z distribution schematic diagram along screw channel.

Fig. 4 is one of a utility model embodiment structure chart.

Fig. 5 is two structure charts of the utility model embodiment.

Fig. 6 is that the B-B of Fig. 4 is to one of structural profile enlarged drawing.

Fig. 7 is that the B-B of Fig. 4 is to two of structural profile enlarged drawing.

Fig. 8 is that the B-B of Fig. 4 is to three of structural profile enlarged drawing.

Fig. 9 is that the B-B of Fig. 4 is to four of structural profile enlarged drawing.

Figure 10 is that the B-B of Fig. 4 is to five of structural profile enlarged drawing.

Figure 11 is that the B-B of Fig. 4 is to six of structural profile enlarged drawing.

Figure 12 is three structure charts of the utility model embodiment.

Figure 13 is that the B-B of Fig. 5 is to profile.

Referring to Fig. 1, traditional theory thinks that the length (L) of screw spiral line part is pressed its function difference to the material effect, section L1 headed by beginning to divide in regular turn from feeding mouth: be called feeding section or solid conveying section; Stage casing L2: be called melt zone or compression section or fluxing zone; Latter end L3: be called extruding zone or homogenizing zone or metering section.Plastics are in the stage casing, and promptly the section of dissolving L2 occurs from melt film, along with the increase of thermal history, during the screw rod rotation, just form molten bath 55 on the thrust face 53 of its spiral shell rib 52, another convenient Solid Bed 54 that forms of its adjacent interface.The fusion process of melt zone L2 be Solid Bed 54 volume from big to small, until the process that disappears; And molten bath 55 is from small to large, until the process that all is full of screw channel 51.For this reason, along screw channel 51 cross sections, the width X of its Solid Bed 54 is the processes that reduce from B → O (B is the width of screw channel); And the width in molten bath 55 (B-X) is the process that is increased by O → B, as shown in Figure 2.Under traditional theory instructed, the structure of melt zone L2 screw rod should keep the released state at Solid Bed 54 and bath 55 the two poles of the earth, and at melt zone, to screw channel is launched, solid phase 57 and liquid phase 56 just have significantly interface, as shown in Figure 3 along Z.Wherein, L21 is that melt zone begins, and L22 is that melt zone stops.

Be described in detail below in conjunction with 4 to 13 pairs of concrete structures of the present utility model of accompanying drawing:

The pulsation screw rod that has helical form processing mixer element, one screw rod body 1 is arranged, screw rod body 1 be provided with screw thread 11 and divide successively along its length direction headed by section 12, interlude 13 and latter end 14, it is characterized in that: design is processed with along screw channel and moves towards the mixer element 132 of shape distribution in the shape of a spiral in the screw channel 131 of screw rod interlude 13, moves towards design along this mixer element 132 and is processed with interruption-like several shear-mixed unit gap 1321 that material is passed through by this mixer element self side direction opposite side in the screw channel that supply.Referring to Fig. 4 to Fig. 7.

The mixer element 132 of helical form trend is to be made of the thread segment that a spiro edge height is lower than the interlude spiro edge height, cutting downwards is processed with several shear-mixed unit gap 1321 on the spiro edge height direction of continuous shape screw thread body.Referring to Fig. 4.

The mixer element 132 of helical form trend be by several at interval mountings be fixed in the interlude screw channel and in the shape of a spiral the independent component 1322 arranged of shape be arranged to form.Referring to Fig. 5.

Is triangle or arc or trapezoidal or zigzag by mixer element self thread segment spiral shell rib top to bottom thread root cutting processing and perpendicular to the shape of the mixed cell gap 1321 of spiral shell rib normal section.See Fig. 6 to Figure 11.

Independent component 1322 shapes are cylindrical or triangle body or cone or multiple edge body or plate body, see Fig. 5, Figure 13.

The independent component of different shape mixes the mixer element 132 that distribution is set and forms helical form trend along welding in the interlude screw channel.Ginseng figure Figure 12 or Figure 13.

Spiral helicine mixer element 132 is constituted, and to move towards the spiral spiral section that has gap volume, variform unit gap 1321 be continuous or segmentation is provided with.Referring to Figure 11.

Claims

1, the pulsation screw rod that has helical form processing mixer element, one screw rod body is arranged, the screw rod body be provided with screw thread and divide successively along its length direction headed by section, interlude and latter end, it is characterized in that: design is processed with along screw channel and moves towards the mixer element of shape distribution in the shape of a spiral in the screw channel of screw rod interlude, moves towards design along this mixer element and is processed with interruption-like several shear-mixed unit gap that material is passed through by this mixer element self side direction opposite side in the screw channel that supply.

2, the pulsation screw rod that has helical form processing mixer element as claimed in claim 1 is characterized in that: the mixer element of helical form trend is to be made of the thread segment that a spiro edge height is lower than the interlude spiro edge height, cutting downwards is processed with several shear-mixed unit gap on the spiro edge height direction of continuous shape screw thread body.

3, the pulsation screw rod that has helical form processing mixer element as claimed in claim 1 is characterized in that: the mixer element of helical form trend be by several at interval mountings be fixed in the interlude screw channel and in the shape of a spiral the independent component arranged of shape be arranged to form.

4, the pulsation screw rod that has helical form processing mixer element as claimed in claim 2 is characterized in that: is triangle or arc or trapezoidal or zigzag by mixer element self thread segment spiral shell rib top to bottom thread root cutting processing and perpendicular to the shape of the mixed cell gap of spiral shell rib normal section.

5, the pulsation screw rod that has helical form processing mixer element as claimed in claim 3, it is characterized in that: the independent component shape is cylindrical or triangle body or cone or multiple edge body or plate body.

6, the pulsation screw rod that has helical form processing mixer element as claimed in claim 3 is characterized in that: the independent component of different shape mixes the mixer element that distribution is set and forms helical form trend along welding in the interlude screw channel.

7, as claim 2 or the 4 described pulsation screw rods that have helical form processing mixer element, it is characterized in that: spiral helicine mixer element constituted, and to move towards the spiral spiral section that has gap volume, variform unit gap be continuous or segmentation is provided with.