Solid non-closed conveying and compacting exhaust method of eccentric rotor extruder
Technical Field
The invention relates to the technical field of high polymer material forming processing, in particular to a solid non-closed conveying, compacting and exhausting method of an eccentric rotor extruder.
Background
The invention discloses a method and a device for plasticizing and transporting volume pulsating deformation of an eccentric rotor in Chinese invention patent application with the application number of 201410206552.8, and provides a novel polymer processing new method and theory, so that a high polymer material is dominated by the volume pulsating deformation in the whole plasticizing processing process, and the volume of the material between the eccentric rotor and a stator is changed periodically along the axial direction and the radial direction of the stator by utilizing the rolling action of the eccentric rotor in the inner cavity of the stator during the autorotation and the constant speed reverse revolution, thereby realizing the plasticizing and transporting of the volume pulsating deformation of the material. The eccentric rotor extruder comprises a stator and a rotor arranged in an inner cavity of the stator; the rotor comprises a plurality of rotor eccentric spiral sections and a plurality of rotor eccentric straight-line sections which are alternately arranged; the stator inner cavity also comprises a plurality of stator spiral sections and a plurality of stator straight sections which are alternately arranged; the rotor eccentric spiral section and the rotor eccentric straight line section correspond to the stator spiral section and the stator straight line section one by one; along the conveying direction of the materials, the screw pitches of the eccentric spiral sections of the rotors and the spiral sections of the stators are gradually reduced; the radial sections of the spiral section and the straight line section of the inner cavity of the stator are both long holes, the eccentric rotor reciprocates in the long holes of the inner cavity of the stator, and the movement stroke is twice of the maximum eccentricity of the rotor. Because the eccentric rotor rolls in the inner cavity of the stator when rotating and revolving in the same speed and in the reverse direction, the space volume between the eccentric rotor and the stator changes periodically along the axial direction and the radial direction of the stator alternately, and the materials between the stator and the rotor bear the volume pulsation deformation action when being compressed and released periodically, thereby completing the plasticizing transportation process comprising solid compaction, melting plasticizing, mixing and melt conveying. The device disclosed by the invention has the characteristics of short material thermal mechanical process, low energy consumption, wide adaptability and the like.
However, the plasticizing transportation process of the polymer is generally divided into three stages, namely solid conveying, melting and melt conveying. In practical application, because the polymer raw material is generally in a solid granular or powder state, not only solid compaction and solid conveying are required to be completed in the solid conveying stage, but also the exhaust in the compaction process is required to be realized, and the influence of gas in a polymer melt on the performance of a high polymer material product is avoided. Therefore, it is necessary to improve the structure of the eccentric rotor extruder to achieve both solid delivery and complete degassing.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a solid non-closed conveying, compacting and exhausting method of an eccentric rotor extruder.
The technical scheme of the invention is as follows: a solid non-closed conveying and compacting exhaust method of an eccentric rotor extruder is characterized in that in a solid conveying section, the section of an inner cavity of a stator is in a long hole shape, and the diameter of an eccentric rotor is smaller than the short section distance of the long hole of the inner cavity of the stator; in the conveying process of solid materials, the eccentric rotor rolls along the edge of the long hole of the inner cavity of the stator, the eccentric rotor is attached to one side of the long hole to realize non-closed conveying and compaction of the solid materials, at the moment, air between the solid materials is discharged to the opposite direction of the solid conveying direction through a gap between the eccentric rotor and the other side of the long hole, and finally is discharged from the feeding port.
The solid conveying section comprises an exhaust section and a positive displacement conveying section which are connected, the exhaust section and the positive displacement conveying section are sequentially arranged according to the conveying direction of the solid materials, and the tail end of the positive displacement conveying section is connected with the melting section; in the exhaust section, the diameter of the eccentric rotor is smaller than the short section distance of the long hole in the inner cavity of the stator; in the positive displacement conveying section, along the conveying direction of solid materials, the diameter of the eccentric rotor is gradually increased to be equal to the section intercept of the long hole in the inner cavity of the stator.
In the exhaust section, the eccentric rotor carries out non-closed conveying and compaction on the solid material and simultaneously realizes complete exhaust; in the positive displacement transport section, the eccentric rotor realizes positive displacement transport to the solid material (along the material direction of delivery, the material in the cavity that eccentric rotor and stator constitute all can be carried forward).
In the solid conveying section, the screw pitch of the eccentric rotor is gradually increased and then gradually decreased.
The length of the eccentric rotor with the gradually increased pitch is 1/3-2/3 of the length of the whole solid conveying section.
The gap width between the eccentric rotor and the other side of the long hole is equal to the difference between the short section of the long hole in the inner cavity of the stator and the diameter of the eccentric rotor.
And in the conveying process of the solid materials, the eccentric rotor simultaneously performs rotation and revolution motion in the inner cavity of the stator.
An eccentricity exists between the axis of the eccentric rotor and the axis of the stator; the rotation motion of the eccentric rotor in the stator cavity is the rotation motion of the eccentric rotor around the axis of the eccentric rotor, and the revolution motion of the eccentric rotor in the stator cavity is the rotation motion of the eccentric rotor around the axis of the stator.
In the method, the radial section of the inner cavity of the stator is in a track-shaped long hole structure, the short intercept of the long hole structure is the minimum width (namely the distance between two straight line sections) in the long hole, and the long intercept of the long hole structure is the maximum width (namely the maximum distance between two circular arc sections) in the long hole.
When the method is used, the specific principle is as follows: in the solid conveying section, along the conveying direction of the solid materials, the screw pitch of the eccentric rotor is gradually increased and then gradually decreased, so that the solid materials are quickly conveyed and compacted. The diameter of the eccentric rotor is smaller than the short-section distance of the long hole of the stator inner cavity, so when the eccentric rotor rolls tightly close to the edge of the long hole of the stator inner cavity, a certain gap is inevitably formed between the eccentric rotor and the other side of the long hole, and the width of the gap is the difference between the short-section distance of the long hole of the stator inner cavity and the diameter of the eccentric rotor, so that the non-closed conveying of solid materials is realized; in the solid conveying section, when the eccentric rotor rotates and revolves, materials enter a cavity formed by the eccentric rotor and the stator cavity from the feeding hole, on any cross section, the eccentric rotor rolls along the edge of the long hole of the stator cavity to convey and compact the materials, and air among solid particles moves backwards from a gap between the eccentric rotor and the other side of the long hole and is discharged from the material inlet. In the later stage of the solid conveying section (namely the positive displacement conveying section), after the solid materials are compacted and complete exhaust is realized, the diameter of the eccentric rotor is gradually increased until the diameter is equal to the short section distance of the long hole in the inner cavity of the stator, so that the positive displacement conveying of the object materials in the melting section and the melt conveying section is realized.
Compared with the prior art, the invention has the following beneficial effects:
the solid non-closed conveying, compacting and exhausting method of the eccentric rotor extruder is simple in principle, and conveying, compacting and exhausting of solid materials can be simultaneously realized by arranging the gap between the eccentric rotor and the inner cavity of the stator, so that favorable precondition is provided for subsequent improvement of product performance.
The non-closed conveying method and the compaction and exhaust method of the eccentric rotor extruder adopt a non-closed conveying method, so that the feeding and conveying of various solid materials can be realized; and the exhaust method is simple, and the rapid exhaust of the polymer solid material can be realized.
The air exhaust structure in the solid non-closed conveying and compacting air exhaust method of the eccentric rotor extruder is flexible and simple, and the diameter of the eccentric rotor in the solid conveying section can be adjusted according to the characteristics of solid materials to achieve the best conveying and air exhaust effect.
Drawings
FIG. 1 is a schematic structural diagram of a stator and an eccentric rotor used in the solid non-closed conveying and compacting and exhausting method of the eccentric rotor extruder.
Fig. 2 is a cross-sectional view a-a of fig. 1.
Fig. 3 is a cross-sectional view B-B of fig. 1.
Fig. 4 is a cross-sectional view C-C of fig. 1.
Fig. 5 is a cross-sectional view D-D of fig. 1.
Fig. 6 is a cross-sectional view E-E of fig. 1.
In the above figures, 1 is the stator, 2 is the eccentric rotor, and L is the short intercept of the slot of the stator inner cavity.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Examples
In the embodiment of the solid non-closed conveying and compacting and exhausting method of the eccentric rotor extruder, as shown in fig. 1 to 6, in a solid conveying section, the section of an inner cavity of a stator is in a long hole shape, and the diameter of an eccentric rotor is smaller than the short section distance of the long hole of the inner cavity of the stator; in the conveying process of solid materials, the eccentric rotor rolls along the edge of the long hole of the inner cavity of the stator, the eccentric rotor is attached to one side of the long hole to realize non-closed conveying and compaction of the solid materials, at the moment, air between the solid materials is discharged to the opposite direction of the solid conveying direction through a gap between the eccentric rotor and the other side of the long hole, and finally is discharged from the feeding port.
The solid conveying section comprises an exhaust section and a positive displacement conveying section which are connected, the exhaust section and the positive displacement conveying section are sequentially arranged according to the conveying direction of the solid materials, and the tail end of the positive displacement conveying section is connected with the melting section; in the exhaust section, the diameter of the eccentric rotor is smaller than the short section distance of the long hole in the inner cavity of the stator; in the positive displacement transport section, in the direction of conveyance of the solid material, as shown in fig. 5 and 6, the diameter of the eccentric rotor gradually increases to be equal to the section intercept of the long hole of the stator cavity (i.e., to the section E-E in fig. 1). In the exhaust section, the eccentric rotor realizes complete exhaust while carrying out non-closed conveying and compaction on the solid material; in the positive displacement transport section, the eccentric rotor realizes positive displacement transport to the solid material (along the material direction of delivery, the material in the cavity that eccentric rotor and stator constitute all can be carried forward).
In the whole solid conveying section, the screw pitch of the eccentric rotor is gradually increased and then gradually decreased. The length of the eccentric rotor with the gradually increased pitch is generally 1/3-2/3 of the length of the whole solid conveying section, and in the embodiment, the length of the eccentric rotor with the gradually increased pitch is about 1/2 of the length of the whole solid conveying section.
The gap width between the eccentric rotor and the other side of the slot is equal to the difference between the short section of the slot of the stator cavity and the diameter of the eccentric rotor (as is evident from fig. 2 or fig. 5).
During the conveying process of the solid materials, the eccentric rotor simultaneously performs rotation and revolution motion in the inner cavity of the stator. An eccentricity exists between the axis of the eccentric rotor and the axis of the stator; the rotation motion of the eccentric rotor in the stator cavity is the rotation motion of the eccentric rotor around the axis of the eccentric rotor, and the revolution motion of the eccentric rotor in the stator cavity is the rotation motion of the eccentric rotor around the axis of the stator.
In the method, the radial section of the inner cavity of the stator is in a track-shaped long hole structure, the short intercept of the long hole structure is the minimum width (namely the distance between two straight line sections) in the long hole, and the long intercept of the long hole structure is the maximum width (namely the maximum distance between two circular arc sections) in the long hole.
When the method is used, the specific principle is as follows: in the solid conveying section, along the conveying direction of the solid materials, the screw pitch of the eccentric rotor is gradually increased and then gradually decreased, so that the solid materials are quickly conveyed and compacted. The diameter of the eccentric rotor is smaller than the short section distance L of the long hole of the stator inner cavity, so when the eccentric rotor rolls tightly close to the edge of the long hole of the stator inner cavity, a certain gap is inevitably formed between the eccentric rotor and the other side of the long hole, and the width of the gap is the difference between the short section distance of the long hole of the stator inner cavity and the diameter of the eccentric rotor, so that the non-closed conveying of solid materials is realized; in the solid conveying section, when the eccentric rotor rotates and revolves, materials enter a cavity formed by the eccentric rotor and the stator cavity from the feeding hole, on any cross section, the eccentric rotor rolls along the edge of the long hole of the stator cavity to convey and compact the materials, and air among solid particles moves backwards from a gap between the eccentric rotor and the other side of the long hole and is discharged from the material inlet. In the later stage of the solid conveying section (namely the positive displacement conveying section), after the solid materials are compacted and complete exhaust is realized, the diameter of the eccentric rotor is gradually increased until the diameter is equal to the short section distance of the long hole in the inner cavity of the stator, so that the positive displacement conveying of the object materials in the melting section and the melt conveying section is realized.
As mentioned above, the present invention can be better realized, and the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention; all equivalent changes and modifications made according to the present disclosure are intended to be covered by the scope of the claims of the present invention.