CN202088433U

CN202088433U - Differential three-screw extruder with triangularly arranged screws

Info

Publication number: CN202088433U
Application number: CN2011200974941U
Authority: CN
Inventors: 王克俭
Original assignee: Beijing University of Chemical Technology
Current assignee: Beijing University of Chemical Technology
Priority date: 2011-04-06
Filing date: 2011-04-06
Publication date: 2011-12-28
Anticipated expiration: 2021-04-06

Abstract

The utility model relates to a differential three-screw extruder with triangularly arranged screws. The differential three-screw extruder mainly comprises a feeding device, a machine barrel, the screws, a machine head, a heating and cooling device, an exhaust port, a motor and a transmission device. The three screws comprise two male rotors and a female rotor which are triangularly arranged; as least one thread engagement section exists when the three screws are combined, and the quantity of the spiral edge heads of the female rotor at the thread engagement section is an integral multiple of that of the spiral edge heads of the male rotors; the rotation speed of the female/male rotor is inversely proportional to the quantity of the spiral edge heads of the female/male rotor, so as to realize differential rotation and movement without interference; the three screws can be arranged in the shape of an inverted or upright Chinese character 'pin' which means quality, or other triangular placement modes; thread sections with different leads and different cross-section molded lines can be arranged at the feeding sections, the melting sections, the exhaust sections and the metering sections of the screws respectively; and when the three screws are mounted, that at least one differentially rotating thread engagement section exists is ensured, and the different sections can be engaged or disengaged.

Description

The differential three-screw extruder of screw rod rounded projections arranged

Technical field

The utility model relates to the differential three-screw extruder of screw rod rounded projections arranged, processing is extruded in the conveying, plasticizing, mixing, granulation, extrusion molding and the reaction that are fit to material, can be used for industries such as oil, chemical industry, rubber, plastics, food, pharmacy, explosive and propellant.

Background technology

In industry such as oil, chemical industry, rubber, plastics, pharmacy, food, explosive and propellant, often relate to the high viscosity fluid mix, mixing effects such as shearing and plasticizing, extruder and kneader are the important equipments of realizing these effects.Three-screw extruder aspect melting effect and output can be significantly better than single screw extrusion machine and double screw extruder, and solves the defective that traditional kneader takes up room greatly, efficient is low and can not work continuously, and has good development prospect.

A kind of differential twin-screw kneader is provided among the patent CN201079735Y, had both had traditional kneader device to mixing, the shearing of high viscosity fluid and plastify mixing effect, had the characteristics that counter rotation twin screw extruder is extruded continuously again.In the differential twin-screw kneader course of work, two screw rods are meshing with each other.Exist the region of engagement between two screw rods,, have speed difference between spiral shell rib and screw channel, obviously strengthened mixed effect at the place, region of engagement.But the screw rod in this patent helicitic texture vertically is identical, can not adapt to the needed different helicitic textures of material different processing stages; This patent regulation male rotor number of starts is 1, and form is too single; And this patent is a kind of continuous kneader, can not well be applicable to the extrusion molding, granulation, mixing etc. of material.

Patent CN01207223.0 develops the three-screw extruder of rounded projections arranged on the basis of double screw extruder, three screw rods are arranged in parallel, and forms three and mediates district and a center.Relative double screw extruder, three-screw extruder has the positive conveyance characteristic of fricting shearing and a plurality of region of engagements, and material and screw rod have bigger contact area.Mixing fully, heat transmitting is good, melt capacity is big, exhaust capacity is good and temperature control is better, and have lower energy consumption.

If differential twin-screw kneader is carried out architecture advances, and increasing a screw rod, form three region of engagements, so no matter to be from energy-conservation, or quality of item all can have better effects.

The utility model content

For further improving mixing behavior and improve output, screw rod in the rounded projections arranged three-screw extruder is replaced with the differential type, form the differential three-screw extruder of screw rod rounded projections arranged.

The differential three-screw extruder of the utility model screw rod rounded projections arranged, mainly form by feeding device, machine barrel, screw rod, head, heating-cooling device, exhaust outlet, motor, transmission device, but three screw rods of differential rotation are arranged in the machine barrel, be triangularly arranged.In the course of the work, three screw rods are meshing with each other, and form three region of engagements.

Screw rod is divided into female rotor and male rotor, and spiral shell rib head number is many is called female rotor, and spiral shell rib head number is few is called male rotor.Two is male rotor in three screw rods, and one is female rotor; At least having a screw-threaded engagement section during three screw combinations, is the integral multiple of male rotor at the female rotor spiral shell rib head number of this section, and the rotary speed of negative and positive rotor and spiral shell rib head number are inverse ratio, can realize the differential rotation.In the screw-threaded engagement section of differential rotation, rotor section molded lines is connected in sequence by the plurality of sections curve, and negative and positive rotor end-face molded lines is corresponding mutually, and the conjugation engagement forms good engagement during differential motion, guarantee not interfere.

In the screw-threaded engagement section of differential rotation, adjacent male helical rotors pair can be conjugation in theory, and positive conveyance ability and pressure capability are very strong.At region of engagement place, because of the very big speed difference of the different formation of screw speed, possess like this and shear and multiple effect such as stretching between the screw channel of the spiral shell rib of female rotor and screw channel and corresponding male rotor and the spiral shell rib, therefore obviously enhancing mixing and plasticizing effect.And the negative and positive rotor is meshing with each other in the process, peels off the material that is attached on the screw rod mutually, has the automatically cleaning ability.

Three screw rods can be two last one under the arrangement of falling the isosceles triangle, also can be one last two under positive isosceles triangle, can also be other triangle modes of emplacement, wherein a female rotor can be placed on leg-of-mutton diverse location.

In order better to adapt to the processing request of material, on the different sections of feeding section, melt zone, exhaust section and the metering section of screw rod, can be set to different lead and end face molded lines even change the thread segment of screw rod spiral shell rib head number.Guarantee when three screw rods are installed to have at least outside the screw-threaded engagement section of a differential rotation, different sections can be engagement also can be out of mesh so that realize strengthening mixing, exhaust effect or other functions.For example, for the mixing ability of further enhancing equipment and realize stable extruding, can increase screw pin section or toothed disc etc., but not interfere must guarantee the negative and positive rotor motion time at certain section; On extruder exhaust section machine barrel exhaust outlet is set, the exhaust outlet device of air that runs in is realized the devolatilization of moisture and other gases, improves quality of item.

Description of drawings

Fig. 1 is the structural representation of the differential three-screw extruder of screw rod rounded projections arranged

The 1-head, 2-machine barrel, 3-heating-cooling device, 4-exhaust outlet, 5-screw rod, 6-feeding device, 7-mount pad, 8-shaft coupling, 9-reduction box, 10-motor, 11-frame.

Fig. 2 is the mesh schematic representation of three screw rods

Fig. 3 be two male rotors a last male rotor under the arrangement of falling isosceles triangle mesh schematic representation

Fig. 4 is that two male rotors are at the arrangement mesh schematic representation of male rotor of a side at opposite side

Fig. 5 is that two male rotors are arranged mesh schematic representation at next male rotor at last positive isosceles triangle

Screw rod sectional drawing when Fig. 6 adopts screw pin for the screw mixing section with pin installing hole

Side view when Fig. 7 adopts the mesh plate element for the screw mixing section

Front view when Fig. 8 adopts the mesh plate element for the screw mixing section

Specific embodiments

Case study on implementation one

Design the differential three-screw extruder of screw rod rounded projections arranged according to Fig. 1, three screw engages such as Fig. 2.Three screw rods 5 adopt spread patterns such as Fig. 3, Fig. 4 or Fig. 5 in the extruder.Wherein, in the screw-threaded engagement district, male rotor spiral shell rib head number is 1, and female rotor spiral shell rib head number is 4.Pot motor is given the negative and positive rotor by reduction box 9, shaft coupling 8 with torque distribution, and the ratio of its speed is that 1/4, two male rotor rotates in the same way, and female rotor and male rotor are incorgruous rotation.Screw rod 5 assemblings are placed in the barrel 2 that is fixed in mount pad 7, have exhaust outlet 4 on the barrel 2, regulate temperature by outer dress heating-cooling device 3, and barrel 2, reduction box 9 and motor are directly installed on the frame 11.

Add material to be processed from charge door 6, material becomes molten condition by pellet or powder after Solid Conveying and Melting, compression fusion.During through exhaust outlet 4, moisture and volatilization gas in the material are discharged machine barrel via exhaust apparatus.Near head 1 mixing section is set on the screw rod, adopts the screw form with holes of settling pin among Fig. 6.Pin plays and cuts apart materials flow on the screw rod, increases the interface, changes the materials flow direction, makes the interface reorientation, the effect that materials flow is rearranged.By repeatedly shunting, converge, reorientation and realize distributing and mix has remedied the incorgruous rotation of rotor and has distributed and mix indifferent shortcoming.Material is extruded by head 1 through behind the mixing section.

Case study on implementation two

Be similar to case study on implementation one and form the differential three-screw extruder.Difference is in the mixing section of screw rod at close head 1, adopts Fig. 7 and mesh plate form shown in Figure 8.Tooth shape of screw dish noninterlace district can shunt material, increases the interface, and minimum energy input is provided, and helps distributing and mixes, and produces lower temperature; , also help distributing and mix the shearing of material formation at ecotone, remedied the hypodynamic shortcoming of distribution mixing energy perpendicular to flow direction.

Claims

1. the differential three-screw extruder of a screw rod rounded projections arranged, mainly form by feeding device, machine barrel, screw rod, head, heating-cooling device, exhaust outlet, motor, transmission device, it is characterized in that: three screw rods are divided into two male rotors, and a female rotor is triangularly arranged; At least having a screw-threaded engagement section during three screw combinations, is the integral multiple of male rotor at the female rotor spiral shell rib head number of this section, and the rotary speed of negative and positive rotor and spiral shell rib head number are inverse ratio, can realize the differential rotation, does not interfere during motion.

2. differential three-screw extruder according to claim 1, it is characterized in that: three screw rods can be two last one under the arrangement of falling the isosceles triangle, also can be one last two under positive isosceles triangle, can also be other triangle modes of emplacement, wherein a female rotor can be placed on leg-of-mutton diverse location.

3. differential three-screw extruder according to claim 1, it is characterized in that: the thread segment that on the different sections of feeding section, melt zone, exhaust section and the metering section of screw rod, can be set to different lead and section molded lines, guarantee when three screw rods are installed to have at least outside the screw-threaded engagement section of a differential rotation, different sections can be engagement also can be out of mesh.