CN103057087A - Method and equipment for high polymer material slope pin roller size extensional rheology plasticization transportation - Google Patents

Abstract

The invention discloses a volume extensional rheological plasticization transportation method and equipment of inclined plane rollers of polymer materials. Utilizing the eccentricity of the inner hole of the stator and the rotor, the rollers are placed in multiple inclined grooves evenly distributed along the circumference of the rotor. The axis of the rollers is parallel to the axis of the rotor and the surface of the rollers is tangent to the slope of the inclined grooves of the rotor. The rotor rotates At the same time, under the action of the resistance of the material and the reverse thrust of the inclined surface of the rotor inclined groove, the rollers make a planetary roll tangent to the inner surface of the stator, and the materials in the space surrounded by the stator, rotor and rollers will rotate with the rotor due to their volume. Periodic changes are dominated by volumetric tensile deformation and are transported by plasticization. The equipment structure unit to realize this method is the inclined plane roller plasticizing transport unit, which can be combined with various screw extrusion units or various plunger injection units to form the inclined plane of the extruder or injection machine. Roller plasticizing injection unit.

Description

Volume extensional rheological plasticization transport method and equipment for inclined rollers of polymer materials

technical field

The invention relates to a polymer material plasticizing processing method and equipment, in particular to a polymer material slope roller volume extensional rheological plastic transportation method and equipment.

technical background

At present, the plasticizing processing of polymer materials mainly adopts the plasticizing transportation method based on shear deformation, and the equipment used is mainly screw machinery. The screw machine relies on the dragging effect on the material when the screw rotates during the plasticizing process, and the velocity gradient of the material is perpendicular to its flow deformation direction. This processing method usually has problems such as low output, high pressure fluctuations, large temperature fluctuations, and large output fluctuations, which directly lead to defects such as product size fluctuations, performance degradation, and narrow adaptability to materials. Through certain theoretical research, a series of improvements have been made to the conventional screw. The screw machine is a plasticizing and transporting device based on shear rheology. Its plasticizing and transporting ability still strongly depends on the physical properties of the material. Its plasticizing There is limited room for improvement in transport performance.

The dynamic plasticizing molding processing method and equipment of polymer materials are innovative plasticizing processing methods and equipment based on the above problems. Different from changing the length-to-diameter ratio of the screw and changing the structure of the screw to optimize the plasticizing process, the dynamic plasticizing molding method of polymer materials is a new plasticizing processing method based on dynamic shear rheology. The whole process of plastic plasticizing processing. Compared with traditional screw equipment, this method shortens the thermomechanical history, reduces processing energy consumption, improves product performance and enhances the adaptability to materials. However, the essence of this method is still based on the shear rheological screw plasticizing transportation equipment, which cannot fundamentally solve the problem that the plasticizing transportation capacity depends on the friction between the material and the surface of the metal barrel and the internal friction of the material. Therefore, the space for reducing the energy consumption of plasticizing transportation and improving the capacity of plasticizing transportation is also very limited.

The polymer blade plasticizing extruder is a polymer plasticizing transportation equipment based on extensional rheology. The plasticizing transportation mechanism of this equipment is a new plasticizing transportation under the action of extensional rheology. The method has the characteristics of short thermomechanical course of materials, low energy consumption, wide adaptability and small volume. However, due to its relatively complex structure, equipment installation is more complicated.

Contents of the invention

The purpose of the present invention is to provide a method for plasticizing and transporting polymer materials in which the volume stretching deformation is the dominant effect, so as to solve the problems of high energy consumption, low efficiency and poor adaptability to materials during the processing of polymer materials.

The purpose of the present invention is also to provide inclined roller volume extensional rheological plastic transportation equipment for realizing the above method.

The object of the invention is achieved through the following technical solutions:

A volumetric elongational rheological plasticization transportation method for inclined rollers of polymer materials: materials are transported by the inner wall of the stator, the outer wall of the rotor placed in the inner cavity of the stator and eccentric with the stator, and the rollers arranged in the grooves on the inclined surface of the rotor 1. In the closed space surrounded by the baffle plates at both ends, it is plasticized and transported under the influence of tensile deformation as the rotor rotates periodically.

The polymer material slope roller volume extensional rheological plasticization transportation equipment for realizing the method: it is composed of one or more slope roller plasticization transportation units, and the slope roller plasticization transportation unit is mainly composed of The hollow stator in the cylindrical inner cavity, the cylindrical roller, the cylindrical rotor, the first baffle and the second baffle are composed of the rotor placed in the inner cavity of the stator and set eccentrically with the stator, and a plurality of rollers are evenly distributed on the rotor. In the slope groove on the surface, the first baffle and the second baffle are respectively arranged on both sides of the stator; the first baffle or the second baffle is provided with a feeding gap or a discharge port; The first baffle plate of the previous inclined roller plasticizing transport unit in the transportation unit is connected with the second baffle plate of the latter inclined roller plasticizing transport unit.

The eccentricity between the rotor and the stator is greater than 0 and smaller than the difference between the radius of the inner cavity of the stator and the radius of the rotor. Further, the eccentricity between the rotor and the stator is larger than half of the difference between the radius of the inner cavity of the stator and the radius of the rotor, and smaller than the difference between the radius of the inner cavity of the stator and the radius of the rotor.

More than 3 slope grooves are evenly distributed along the circumference on the rotor.

When the rotor of the present invention rotates, under the action of the resistance of the material and the reverse thrust of the inclined surface of the rotor inclined groove, the rollers do planetary rolling tangent to the inner surface of the stator; the inner surface of the stator, the outer surface of the rotor, the rollers and two baffles A space volume is formed. During the planetary rolling process of the roller tangent to the inner surface of the stator, the space volume changes periodically from small to large and then from large to small; when the volume changes from small to large, the material is continuously included , when the volume of the space changes from large to small, the material is ground, compacted, and exhausted under the main action of normal stress, and at the same time, it is melted, plasticized and discharged under the auxiliary action of external heating from the stator, so as to realize the plasticized transportation of the material. shipping process. Multiple inclined roller plasticizing transport units can be stacked in series to form an extruder, and the inclined roller plasticizing transport unit can be combined with various screw extrusion units or various plunger injection units to form an extruder or injection machine Inclined roller plasticizing injection device.

The present invention adopts the transport method and equipment of inclined-plane roller volume elongational rheological plasticization, and solves the problem that the screw plasticization transport equipment mainly relies on the friction force between the material and the surface of the barrel and the internal friction force of the material for processing. Compared with the traditional screw plasticizing transportation technology and equipment, it has the following advantages:

1. The thermomechanical process experienced in the plasticizing transportation process is greatly shortened, and the energy consumption of plasticizing transportation is reduced

2. The plasticizing and transporting process is dominated by the volumetric tensile deformation with periodic changes in volume. It has wide adaptability to materials and high plasticizing and transporting efficiency.

Description of drawings

Fig. 1 is a structural schematic diagram of a volumetric elongational rheological plasticization transportation device for inclined rollers of polymer materials;

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

Fig. 3 is a structural schematic diagram of the application of the inclined roller volumetric elongational rheological plastic transport equipment of polymer material in Example 1 to an extruder;

Fig. 4 is the sectional view of B-B direction in Fig. 3;

Fig. 5 is a schematic structural view of the screw inclined roller plasticizing extruder of Example 2 applied to the injection device. Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but the scope of protection claimed by the present invention is not limited to the scope expressed in the embodiments.

Example 1

Referring to Fig. 1 and Fig. 2, the polymer material inclined roller volume elongational rheological plasticization transportation equipment is an inclined roller plasticization transportation unit, which is mainly composed of a hollow stator 1 with a cylindrical inner cavity, placed in the stator 1 The cylindrical rotor 3 in the cavity and eccentric with the stator 1, the roller 2 arranged in the inclined groove 4 of the rotor 3, and the first baffle 5 and the second baffle 6 arranged on both sides of the rotor, etc. The rotor 3 is installed eccentrically in the hollow stator 1. The eccentricity between the rotor 3 and the stator 1 can be adjusted, and its value is greater than 0 and smaller than the difference between the radius of the inner cavity of the stator and the radius of the rotor. One-half of the difference in radius is less than the difference between the radius of the inner cavity of the stator and the radius of the rotor. The rollers 2 are installed in more than three sloped grooves 4 evenly distributed along the circumference of the rotor, the axis of the rollers 2 is parallel to the axis of the rotor 3 and the surface of the rollers 2 is tangent to the slope of the sloped grooves 4 of the rotor 3 . When the rotor 3 rotates counterclockwise, under the action of the resistance of the material and the reverse thrust of the inclined plane groove 4 of the rotor 3, the roller 2 makes a planetary roll tangent to the inner surface of the stator 1, so that the inner surface of the stator 1 , the outer surface of the rotor 3, the roller 2, the first baffle 5 and the second baffle 6 form a space volume, and the volume changes periodically. When the volume changes from small to large, the material can be taken in through the feeding gap A on the first baffle 5, and the volume changes from large to small, and the material is ground, compacted, exhausted and plasticized under the main action of normal stress, and at the same time Plasticized and melted under the auxiliary effect of external heating from the stator, and discharged from the discharge port B on the second baffle plate 6 .

Example 2

As shown in Figure 3 and Figure 4, the screw inclined roller plasticizing extruder is mainly composed of screw extrusion unit I, inclined roller plasticizing unit II, III, IV and drive shaft 1, hopper 2, splitter 5 and transition Set of 6 compositions. The screw extrusion unit I includes a screw 3 and a barrel 4; the screw extrusion unit I and the inclined roller plasticizing units II, III, and IV are installed in series; that is, the screw extrusion unit I and the inclined roller plasticizing units II, III and IV are set sequentially from right to left. The rotors of the inclined roller plasticizing units II, III, and IV are coaxially fixedly connected with the screw rod 3, and the screw rod 3 is coaxially fixedly connected with the drive shaft 1. The hopper 2 is fixed on the barrel 4 of the screw extrusion unit I, the first baffle of the inclined roller plasticizing unit II is concentrically fixedly connected with the barrel 4 of the screw extrusion unit I, and the first baffle of the inclined roller plasticizing unit III A baffle is concentrically and fixedly connected with the second baffle of the inclined roller plasticizing unit II, and the first baffle of the inclined roller plasticizing unit IV is concentrically fixedly connected with the second baffle of the inclined roller plasticizing unit III, and the transition The sleeve 6 is coaxially and fixedly connected with the second baffle plate of the inclined roller plasticizing unit IV. The eccentric direction of the stator of the ramped roller plasticizing unit II relative to the rotor is opposite to the eccentric direction of the stator of the ramped roller plasticizing unit III relative to the rotor, and the eccentric direction of the stator of the ramped roller plasticizing unit IV relative to the rotor is opposite to that of the ramp The stator of the roller plasticizing unit III is eccentrically opposite to the rotor. The flow divider 5 is placed in the circular cavity of the transition sleeve 6 and coaxially fixedly connected with the rotor of the inclined roller plasticizing unit IV. The outlet on the second baffle of the inclined roller plasticizing unit II communicates with the feed inlet on the first baffle of the inclined roller plasticizing unit III, and the second baffle of the inclined roller plasticizing unit III The outlet on the top communicates with the inlet on the first baffle of the inclined roller plasticizing unit IV. When the drive shaft 1 drives the screw of the screw extrusion unit I and the rotors of the plasticizing units II, III, and IV of the inclined rollers to rotate, the materials from the hopper 2 are brought into the screw extrusion unit I, and enter the inclined rollers in turn after being plasticized. Plasticizing units II, III, and IV are further plasticized and homogenized, extruded through a die connected to the transition sleeve 6, cooled, and shaped to obtain a product.

Example 3

As shown in Figure 5, the inclined roller plasticizing injection device is mainly composed of a full inclined roller plasticizing extruder I, a plunger injection unit II and a collector 1; among them, the full inclined roller plasticizing extruder I The structure and working principle are completely the same as the plasticizing screw extruder with inclined plane roller in Example 2; the plunger injection unit II is mainly composed of injection cylinder 2 , injection piston 3 , injection barrel 4 and nozzle 5 . The feed end face of the material collector 1 is fixedly connected with the discharge end face on the transition sleeve 6 (see Figures 3 and 4) of the fully inclined roller plasticizing extruder 1, and the discharge end face of the material collector 1 is injected with the plunger. The feed end face of the injection cylinder 4 of unit II is fixedly connected. The melt plasticized by the fully inclined roller plasticizing extruder I enters the injection cylinder 4 of the plunger injection unit II through the collector 1, and the injection piston 3 of the plunger injection unit II is under the pressure of the melt Retreat, when the storage volume in the injection barrel 4 of the plunger injection unit II reaches the metering value required by the injection product, the full-slope roller plasticizing extruder I stops plasticizing, and the plasticizing metering process of the injection machine ends. After the injection machine completes the mold filling and pressure maintaining processes, the full-slope roller plasticizing extruder I starts plasticizing during the cooling stage of the product, and the injection machine starts a new cycle of product molding.

Claims (5)

1. A volumetric elongational rheological plasticization transportation method of inclined plane rollers of polymer materials, characterized in that: the material is arranged on the inclined surface of the rotor surface by the inner wall of the stator, the outer wall of the rotor placed in the inner cavity of the stator and eccentric with the stator In the closed space surrounded by the rollers in the groove and the baffle plates at both ends, it is subjected to tensile deformation and is plasticized and transported as the rotor rotates periodically. 2. A polymer material inclined-plane roller volume extensional rheological plasticization transportation device for realizing the method of claim 1, characterized in that: it is composed of one or more inclined-plane roller plasticization transportation units, the The inclined roller plasticizing transport unit is mainly composed of a hollow stator (1) with a cylindrical inner cavity, a cylindrical roller (2), a cylindrical rotor (3), a first baffle (5) and a second baffle (6 ), wherein the rotor (3) is placed in the inner cavity of the stator (1) and arranged eccentrically with the stator (1), and a plurality of rollers are evenly distributed in the slope groove (4) opened on the surface of the rotor, and the stator (1) The first baffle (5) and the second baffle (6) are respectively set on both sides; the first baffle (5) or the second baffle (6) is provided with a feeding gap or a discharge port; multiple inclined rollers The first baffle (5) of the previous inclined roller plasticizing transportation unit in the plasticizing transportation unit is connected with the second baffle (6) of the latter inclined roller plasticizing transportation unit. 3. The device according to claim 2, characterized in that: the eccentricity (e) between the rotor (3) and the stator (1) is greater than 0 and smaller than the difference between the inner cavity radius of the stator (1) and the radius of the rotor (3) . 4. The device according to claim 2, characterized in that: the eccentricity (e) of the rotor and the stator is greater than half of the difference between the radius of the inner cavity of the stator and the radius of the rotor, and smaller than the radius of the inner cavity of the stator and the radius of the rotor Difference. 5. The device according to claim 2, characterized in that: more than three slope grooves (4) are evenly distributed along the circumference on the rotor (3).

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