A twin-rotor continuous mixing extruder

Abstract

The utility model relates to extruder technical field, concretely to a kind of double-rotor continuous mixing extruder, including shell and two drive assemblies rotationally arranged in the inside of shell, drive assembly includes installation shaft rotationally arranged in the end of shell, and the end of installation shaft towards the inside of shell is fixed with driving shaft;The outer surface of two driving shafts is slidably provided with rotor extrusion component for improving material dispersion uniformity, and the position of shell corresponding two rotor extrusion components is equipped with guide component;By setting installation shaft, driving shaft, rotor extrusion component, guide component and linkage component, the effect that rotor extrusion component is rotated circumferentially while reciprocating axial sliding is achieved, so that oblique meshing engagement enhances the kneading and tearing effect of rotor to material, and reciprocating swing will change this effect from one-way continuous to high-frequency alternative, and stubborn agglomerated particles in high-viscosity, high-filled material can be repeatedly extruded, scraped and torn from different angles.

Description

Technical Field

[0001] This utility model relates to the field of extruder technology, and in particular to a dual-rotor continuous mixing extruder. Background Technology

[0002] The core performance of automotive sound insulation panels includes sound insulation, lightweighting, environmental protection, and dimensional stability, which are mainly achieved by the multi-component uniform mixing, continuous molding, and low-loss processing capabilities of a twin-rotor continuous mixing extruder.

[0003] The twin-rotor continuous mixing extruder is a modern mixing equipment used for the mixing and modification of plastics and rubber. It is designed to solve the pain points of traditional equipment in the modification of high viscosity, high filler, and multi-component materials, such as uneven mixing, low efficiency, and easy degradation of materials. It is widely used in the modification and processing of plastics, rubber, and composite materials.

[0004] A twin-rotor continuous extruder disclosed in Chinese Patent Publication No. CN210148700U improves the plasticity of rubber by adding a compression section, a secondary plasticizing section, a conveying section, and a final plasticizing section to the traditional twin-screw extruder, enabling it to be extruded into various shapes of rubber. However, according to twin-rotor continuous extruders provided in related fields and existing technologies, most existing twin rotors only achieve circumferential rotation, and the mixing mechanism is mainly based on unidirectional shearing, making it difficult to form a comprehensive and multi-dimensional force on the material. Areas such as between the spiral blades and at the rotor ends are prone to stagnation zones due to the fixed material flow direction, and the fixed tooth shape cannot disturb the material in these areas. As a result, some materials are in a non-main mixing flow field for a long time, leading to local insufficient mixing and limited material dispersion effect. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art, solve the problems mentioned in the background art, and provide a dual-rotor continuous mixing extruder.

[0006] The objective of this utility model is achieved through the following technical solution: a dual-rotor continuous mixing extruder, comprising a housing and two drive assemblies rotatably disposed inside the housing. Each drive assembly includes a mounting shaft rotatably disposed at the end of the housing, with a drive shaft fixedly disposed at one end of the mounting shaft facing the interior of the housing. Rotor extrusion assemblies for improving the uniformity of material dispersion are slidably disposed on the outer surfaces of both drive shafts. The housing is provided with guide assemblies for axial reciprocating sliding when the rotor extrusion assemblies rotate. Each rotor extrusion assembly includes a rotating rod slidably connected to the drive shaft. The outer surface of the rotating rod is provided with multiple sets of helical blades. Multiple oblique teeth are fixedly disposed between the multiple sets of helical blades on the rotating rod. The multiple oblique teeth are circumferentially distributed at equal intervals on the outer surface of the rotating rod. A linkage assembly is provided on the drive shaft for causing the oblique teeth to reciprocate when the rotor extrusion assembly slides.

[0007] Preferably, both mounting shafts are fixedly provided with first gears on their outer surfaces outside the housing, the two first gears mesh with each other, an extrusion structure is fixedly installed at the outlet of the housing, a drive unit for controlling the rotation of one of the mounting shafts is provided at the end of the housing away from the extrusion structure, a feeding structure is fixedly installed at the top of the housing, and a heating unit is provided inside the housing.

[0008] Preferably, the guide assembly includes two wave rings fixedly disposed on the outer surface of the rotating rod, and a fixing seat is embedded between the two wave rings in the housing. The fixing seat is provided with a roller rotatably facing one side of the wave rings, and the roller is disposed between the two wave rings.

[0009] Preferably, the cross-sectional shape of the drive shaft is polygonal, and a blind hole adapted to the drive shaft is provided at the center of the rotating rod.

[0010] Preferably, the linkage assembly includes multiple mounting slots formed on the outer surface of the drive shaft, a rotating shaft rotatably provided on the side of the helical meshing tooth facing the rotating rod, the rotating shaft being rotatably connected to the rotating rod, the end of the rotating shaft away from the helical meshing tooth extending into the mounting slot, a second gear fixedly provided at the end of the rotating shaft located inside the mounting slot, a rack adapted to the second gear being fixedly provided inside each mounting slot, and multiple second gears on the same axis meshing with the rack.

[0011] Preferably, the housing has a fitting groove corresponding to the position of the fixing seat, and the mounting shaft is rotatably connected to the housing via a bearing.

[0012] Preferably, the rotating rod has a rotating hole at the position corresponding to the rotating shaft, and the rotating shaft is connected to the rotating hole through a bearing.

[0013] The beneficial effects of this dual-rotor continuous mixing extruder are as follows: by setting up the mounting shaft, drive shaft, rotor extrusion assembly, guide assembly, and linkage assembly, the rotor extrusion assembly is able to rotate circumferentially while simultaneously sliding axially. This enhances the kneading and tearing effect of the rotor on the material through the meshing of the oblique teeth. The reciprocating oscillation changes this effect from unidirectional continuous to high-frequency alternating. For stubborn agglomerated particles in high-viscosity, high-filled materials, the oscillating oblique teeth will repeatedly squeeze, scrape, and tear from different angles, which can not only break the agglomerated structure more efficiently, but also avoid the formation of anti-breakage inertia in particles under unidirectional force, making the material particles finer and more uniform. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a structural schematic diagram of the exterior of the casing of this utility model from a first-view perspective; Figure 2 This is a structural schematic diagram of the outer shell of this utility model from a second perspective; Figure 3 This is a first-view structural diagram of the interior of the housing of this utility model; Figure 4 This is a structural schematic diagram of the interior of the housing of this utility model from a second perspective; Figure 5 This utility model Figure 4 Enlarged structural diagram at point A; Figure 6 This is a schematic diagram of the rotor extrusion assembly of this utility model; Figure 7 This is a schematic diagram of the linkage component of this utility model.

[0016] In the diagram: 1. Housing; 101. Fitting groove; 2. Mounting shaft; 3. Drive shaft; 4. Rotor extrusion assembly; 401. Rotating rod; 4011. Blind hole; 4012. Rotating hole; 402. Spiral blade; 403. Oblique meshing tooth; 5. Guide assembly; 501. Wave ring; 502. Fixed seat; 503. Roller; 6. Linkage assembly; 601. Mounting groove; 602. Rotating shaft; 603. Second gear; 604. Rack; 7. First gear; 8. Extrusion structure; 9. Drive unit; 10. Feeding structure. Detailed Implementation

[0017] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0018] Additional aspects and advantages of this invention will be further set forth in the description which follows in conjunction with the accompanying drawings, in part of which will be obvious from the description or may be learned by practice of the invention.

[0019] like Figures 1 to 7 As shown, a dual-rotor continuous mixing extruder includes a housing 1 and two drive assemblies rotatably disposed inside the housing 1. Each drive assembly includes a mounting shaft 2 rotatably disposed at one end of the housing 1. The mounting shaft 2 is rotatably connected to the housing 1 via bearings (not labeled in the figure, and the bearings can be sealed to prevent media leakage). The bearings reduce friction during rotation of the mounting shaft 2, improving its stability. A drive shaft 3 is fixedly mounted on one end of the mounting shaft 2 facing inwards from the housing 1. First gears 7 are fixedly mounted on the outer surfaces of both mounting shafts 2 located outside the housing 1. The gears 7 mesh, and the discharge port of the housing 1 is fixedly installed with an extrusion structure 8. The end of the housing 1 away from the extrusion structure 8 is provided with a drive unit 9 (e.g., a motor or differential motor) for controlling the rotation of one of the mounting shafts 2. The top of the housing 1 is fixedly installed with a feeding structure 10. The interior of the housing 1 is provided with a heating unit (the housing 1 is divided into an upper shell and a lower shell, and the feeding structure 10 is fixedly installed on the upper shell). During operation, the drive unit 9 controls the rotation of one of the mounting shafts 2, and then the two first gears 7 mesh to allow the other mounting shaft 2 to rotate in the opposite direction, so that the two mounting shafts 2 will drive the drive shaft 3 to rotate in the opposite direction.

[0020] like Figures 3 to 7As shown, rotor extrusion assemblies 4 for improving material dispersion uniformity are slidably provided on the outer surfaces of both drive shafts 3. Guide assemblies 5 are provided on the housing 1 at positions corresponding to the two rotor extrusion assemblies 4 to allow them to slide axially back and forth during rotation. Each rotor extrusion assembly 4 includes a rotating rod 401 slidably connected to the drive shaft 3. The drive shaft 3 has a polygonal cross-sectional shape, and a blind hole 4011 adapted to the drive shaft 3 is provided at the center of the rotating rod 401. The cooperation between the polygonal drive shaft 3 and the blind hole 4011 allows the drive shaft 3 to drive the rotating rod 401 to rotate, while the rotating rod... 401 can also slide axially inside the housing 1. The outer surface of the rotating rod 401 is provided with multiple sets of spiral blades 402. Multiple oblique teeth 403 are fixedly provided between the multiple sets of spiral blades 402. The multiple oblique teeth 403 are circumferentially distributed at equal intervals on the outer surface of the rotating rod 401. The drive shaft 3 is provided with a linkage component 6 for causing the oblique teeth 403 to swing back and forth when the rotor extrusion assembly 4 slides. The meshing of the oblique teeth 403 enhances the kneading and tearing effect of the rotor on the material. For high viscosity and high filler materials, it can break up agglomerated particles and improve the dispersion uniformity.

[0021] like Figures 3 to 6 As shown, the guide assembly 5 includes two wave rings 501 fixedly disposed on the outer surface of the rotating rod 401. A fixed seat 502 is embedded between the two wave rings 501 in the housing 1. The housing 1 has a fitting groove 101 corresponding to the position of the fixed seat 502. A roller 503 is rotatably disposed on the side of the fixed seat 502 facing the wave rings 501. The roller 503 is disposed between the two wave rings 501. When the rotating rod 401 rotates, the cooperation between the roller 503 and the two wave rings 501 on the outer surface of the rotating rod 401 can cause the rotating rod 401 to rotate circumferentially while the bearing reciprocates. At the same time, the self-rotation of the roller 503 can reduce the friction between the roller 503 and the two wave rings 501, thereby improving the service life of the roller 503 and the two wave rings 501.

[0022] like Figures 3 to 7As shown, the linkage assembly 6 includes multiple mounting slots 601 formed on the outer surface of the drive shaft 3. A rotating shaft 602 is rotatably mounted on the side of the helical meshing teeth 403 facing the rotating rod 401. The rotating shaft 602 is rotatably connected to the rotating rod 401. The end of the rotating shaft 602 away from the helical meshing teeth 403 extends into the mounting slot 601. A second gear 603 is fixedly mounted on the end of the rotating shaft 602 located inside the mounting slot 601. A rack 604 adapted to the second gear 603 is fixedly mounted inside each mounting slot 601. Multiple second gears 603 on the same axis mesh with the rack 604. When the rotating rod 401 slides, the drive shaft 3 only rotates and does not slide. Thus, the helical gear 403, the rotating shaft 602, and the second gear 603 will slide with the rotating rod 401. At this time, by utilizing the cooperation between the second gear 603 and the rack 604, the rotating shaft 602 can control the helical gear 403 to swing when the rotating rod 401 slides. The rotating rod 401 has a rotating hole 4012 at the position corresponding to the rotating shaft 602. The rotating shaft 602 is connected to the rotating hole 4012 through a bearing (not shown in the figure, and the bearing can be set as a sealed bearing to prevent the medium from entering the rotating hole 4012). By using the above-mentioned bearing, the friction force when the rotating shaft 602 rotates can be reduced, and the stability of the rotating shaft 602 when rotating can be improved.

[0023] The work process is as follows: S1: As Figures 1 to 5 As shown, during operation, the drive unit 9 controls one of the mounting shafts 2 to rotate, and then the two first gears 7 mesh to allow the other mounting shaft 2 to rotate in the opposite direction, thereby the two mounting shafts 2 will drive the drive shaft 3 to rotate in the opposite direction. S2: As Figures 3 to 7 As shown, when the two drive shafts 3 rotate in opposite directions, the cooperation between the polygonal drive shaft 3 and the blind hole 4011 can make the drive shaft 3 drive the rotating rod 401 to rotate. S3: As Figures 3 to 6 As shown, when the rotating rod 401 rotates, the cooperation between the roller 503 and the two wave rings 501 on the outer surface of the rotating rod 401 can cause the rotating rod 401 to rotate circumferentially while the bearing reciprocates and slides. S4: In summary, the reciprocating axial sliding combined with circumferential rotation has several advantages. First, it allows the material to simultaneously undergo circumferential shearing and axial tension, creating a combined mixing effect of shearing and tension, resulting in more thorough dispersion and mixing. Second, the engagement of the oblique meshing teeth 403 enhances the rotor's kneading and tearing effect on the material, especially for high-viscosity and high-filling materials, breaking up agglomerated particles and improving dispersion uniformity. Third, the meshing and sliding do not interfere with each other, avoiding the mixing blind spots of a single motion mode, ensuring that the material has no dead angle contact within the shell 1, resulting in higher mixing consistency. S5: As Figures 3 to 7As shown, when the rotating rod 401 slides, since the drive shaft 3 only rotates and does not slide, the helical gear 403, the rotating shaft 602 and the second gear 603 will slide with the rotating rod 401. At this time, by utilizing the cooperation between the second gear 603 and the rack 604, the rotating shaft 602 can control the helical gear 403 to swing when the rotating rod 401 slides. S6: In summary, the oblique teeth 403 themselves have the function of kneading and tearing materials when they mesh, and the reciprocating oscillation will change this function from unidirectional continuous to high-frequency alternating. For stubborn agglomerated particles in high-viscosity, high-filling materials, the oscillating oblique teeth 403 will repeatedly squeeze, scrape and tear from different angles, which can not only break the agglomerated structure more efficiently, but also avoid the formation of anti-breakage inertia of particles under unidirectional force, so that the material particles are finer and more uniform.

[0024] The housing 1, extrusion structure 8, drive unit 9, feeding structure 10, heating unit and sealed bearing described in this application are all known technologies in this field, therefore their specific structures and working principles are not described in detail.

[0025] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A dual-rotor continuous mixing extruder, characterized in that: It includes a housing (1) and two drive components rotatably disposed inside the housing (1). The drive components include a mounting shaft (2) rotatably disposed at the end of the housing (1), and a drive shaft (3) is fixedly disposed at one end of the mounting shaft (2) facing the inside of the housing (1). The outer surfaces of the two drive shafts (3) are slidably provided with rotor extrusion assemblies (4) for improving the uniformity of material dispersion. The housing (1) is provided with guide assemblies (5) for axial reciprocating sliding when the rotor extrusion assemblies (4) are rotated. The rotor extrusion assembly (4) includes a rotating rod (401) slidably connected to the drive shaft (3). The outer surface of the rotating rod (401) is provided with multiple sets of spiral blades (402). Multiple oblique teeth (403) are fixedly provided between the multiple sets of spiral blades (402) on the rotating rod (401). The multiple oblique teeth (403) are circumferentially distributed at equal intervals on the outer surface of the rotating rod (401). The drive shaft (3) is provided with a linkage assembly (6) for causing the oblique teeth (403) to swing back and forth when the rotor extrusion assembly (4) slides.

2. The dual-rotor continuous mixing extruder according to claim 1, characterized in that: Two mounting shafts (2) are fixedly provided with first gears (7) on the outer surface of the housing (1), and the two first gears (7) mesh with each other. An extrusion structure (8) is fixedly installed at the outlet of the housing (1). A drive unit (9) for controlling the rotation of one of the mounting shafts (2) is provided at one end of the housing (1) away from the extrusion structure (8). A feeding structure (10) is fixedly installed on the top of the housing (1). A heating unit is provided inside the housing (1).

3. The dual-rotor continuous mixing extruder according to claim 1, characterized in that: The guide assembly (5) includes two wave rings (501) fixedly disposed on the outer surface of the rotating rod (401). The housing (1) is embedded with a fixing seat (502) between the two wave rings (501). The fixing seat (502) is provided with a roller (503) rotatably facing one side of the wave rings (501). The roller (503) is disposed between the two wave rings (501).

4. A twin-rotor continuous mixing extruder according to claim 3, characterized in that: The cross-sectional shape of the drive shaft (3) is polygonal, and a blind hole (4011) adapted to the drive shaft (3) is provided at the center of the rotating rod (401).

5. A twin-rotor continuous mixing extruder according to claim 4, characterized in that: The linkage assembly (6) includes a plurality of mounting slots (601) formed on the outer surface of the drive shaft (3). The helical meshing tooth (403) is rotatably provided with a rotating shaft (602) facing the rotating rod (401). The rotating shaft (602) is rotatably connected to the rotating rod (401). The end of the rotating shaft (602) away from the helical meshing tooth (403) extends into the mounting slot (601). The end of the rotating shaft (602) located inside the mounting slot (601) is fixedly provided with a second gear (603). Each mounting slot (601) is fixedly provided with a rack (604) adapted to the second gear (603). A plurality of second gears (603) on the same axis mesh with the rack (604).

6. A twin-rotor continuous mixing extruder according to claim 3, characterized in that: The housing (1) has a fitting groove (101) at the position corresponding to the fixed seat (502), and the mounting shaft (2) is rotatably connected to the housing (1) through a bearing.

7. A twin-rotor continuous mixing extruder according to claim 5, characterized in that: The rotating rod (401) has a rotating hole (4012) at the position corresponding to the rotating shaft (602), and the rotating shaft (602) is connected to the rotating hole (4012) through a bearing.

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