Flame-retardant plastic color masterbatch extruder

Abstract

The application relates to a fire-retardant plastic color masterbatch extruder which comprises a machine body provided with an extrusion cavity and a screw, the screw is rotationally connected in the extrusion cavity, further comprises a rotating drum and a driving assembly, the rotating drum is coaxial with the screw and rotationally connected in the extrusion cavity, the screw is coaxial with the rotating drum and penetrates the rotating drum, the rotating direction of the screw is opposite to that of the rotating drum, a mixing disc is coaxial with and fixedly connected on the screw, a plurality of mixing channels are uniformly arranged on the mixing disc, and the driving assembly is used for simultaneously driving the rotation of the screw and the rotating drum. The opposite rotation of the rotating drum and the screw enables the material to be subjected to bidirectional stirring and shearing force during the extrusion process, so that the material can be more fully mixed, the mixing uniformity is improved, and the product quality is improved. The mixing disc and the mixing channels are arranged, the mixing disc rotates with the screw, the flowing direction and speed of the material are continuously changed when the material passes through the mixing channels, and the mixing effect is further improved.

Description

Technical Field

[0001] This utility model relates to the field of plastic masterbatch production, and in particular to a flame-retardant plastic masterbatch extruder. Background Technology

[0002] A flame-retardant plastic masterbatch extruder is a device used to produce flame-retardant plastic masterbatches. Its working principle is as follows: plastic raw materials, masterbatches, flame retardants, etc., are fed into the hopper. The rotating screw propels the material forward, and through shearing friction and external heating, the material melts into a uniformly mixed plastic melt. Under the thrust of the screw, the molten material is extruded through specific channels in the die head into masterbatch strips or granules of a fixed shape.

[0003] Existing extruders rely solely on friction between the screw and the barrel wall for mixing, resulting in a simplistic mixing method. Material mixing primarily depends on the residence time of the material within the barrel. As production efficiency increases, the residence time of the material in the barrel decreases, making it even more difficult to ensure thorough mixing. Utility Model Content

[0004] To enhance the mixing effect of the extruder, this application provides a flame-retardant plastic masterbatch extruder.

[0005] The flame-retardant plastic masterbatch extruder provided in this application adopts the following technical solution:

[0006] A flame-retardant plastic masterbatch extruder includes a machine body with an extrusion chamber and a screw, the screw being rotatably connected within the extrusion chamber. It also includes a drum and a drive assembly. The drum is coaxial with the screw and rotatably connected within the extrusion chamber. The screw is coaxial with and passes through the drum, and the screw and drum rotate in opposite directions. A mixing disc is coaxially and fixedly connected to the screw, and the mixing disc has multiple mixing channels evenly distributed on it. The drive assembly is used to simultaneously drive the rotation of both the screw and the drum.

[0007] By adopting the above technical solution, the drum and screw rotate in opposite directions, subjecting the material to bidirectional stirring and shearing forces during extrusion. This allows for more thorough mixing, improving mixing uniformity and thus enhancing product quality. The mixing disc and mixing channel are also included; the mixing disc rotates with the screw, and the flow direction and speed of the material continuously change as it passes through the mixing channel, further enhancing the mixing effect.

[0008] Preferably, the extrusion chamber includes a feeding section, a mixing section, and a discharge end. The machine body is provided with several storage tanks connected to the feeding section. There are two mixing discs, which are located on both sides of the mixing section. The rotating drum is rotatably connected to the mixing section.

[0009] By adopting the above technical solution, the feeding section facilitates stable material conveying, the mixing section focuses on mixing the color masterbatch, and the discharge end ensures uniform extrusion of the mixed material. This structure optimizes the extrusion process and improves production efficiency and product quality. Two mixing discs are located on either side of the mixing section. The material first enters the first mixing disc closest to the feeding section, where it still maintains high fluidity. The mixing discs perform initial diversion and reorganization of the material through the mixing channels, dispersing large pieces of material into multiple smaller streams. After passing through the first mixing disc, the material moves to the second mixing disc under the reverse shearing action of the screw and drum. The second mixing disc further agitates the material, further enhancing the mixing effect.

[0010] Preferably, the multiple mixing channels are divided into multiple groups, and the distance between the central axis of the multiple mixing channels in each group and the side closer to the feed section and the side farther away from the feed section gradually decreases.

[0011] By adopting the above technical solution, the material flow path becomes different when the material passes through the mixing channel, forming a complex flow field, thereby increasing the chances of mutual collision and mixing between materials, and improving the uniformity and fineness of mixing.

[0012] Preferably, each of the two mixing discs has a plurality of protruding ridges on its two end faces, and the height between adjacent protruding ridges gradually changes.

[0013] By adopting the above technical solution, the protruding ridges will block and disturb the material, making the flow of the material on the surface of the mixing disc more complex, increasing the degree of material tumbling and mixing. The gradual change in the height of adjacent protruding ridges further enhances this disturbance effect, which is conducive to improving the mixing quality.

[0014] Preferably, the inner wall of the rotating cylinder is provided with some turbulence-disrupting blades around its circumference.

[0015] By adopting the above technical solution, the turbulence blades change the flow state of the material in the rotating drum, preventing the material from simply rotating with the drum, increasing the residence time and mixing opportunities of the material in the drum, and improving the mixing effect.

[0016] Preferably, the outer surface of some of the turbulence blades is provided with rough texture.

[0017] By adopting the above technical solution, the rough texture increases the friction between the blade and the material, making the flow of the material on the blade surface more turbulent, further enhancing the turbulence effect, and helping to improve the mixing uniformity of the material.

[0018] Preferably, the drive assembly includes a motor, an idler wheel, and a gear column. A gear is coaxially and fixedly connected to the screw, and a gear ring is coaxially and fixedly connected to the drum. The gear column and the idler wheel are rotatably connected to the machine body, and the gear column and the idler wheel are meshed with each other. The gear column and the idler wheel are meshed with the gear ring and the gear, respectively. The motor is fixedly connected to the machine body, and one end of the motor's output shaft is coaxially and fixedly connected to the screw.

[0019] By adopting the above technical solution, the motor provides power, and the gear and idler wheel realize the transmission and direction change of force, so that the screw and drum can rotate in opposite directions as required by the design. This structure is simple and reliable, has high transmission efficiency, and is easy to install and maintain, while ensuring the stability and accuracy of the rotation of the screw and drum.

[0020] The main technical effects of this utility model are reflected in the following aspects:

[0021] 1. This invention causes the drum and screw to rotate in opposite directions, subjecting the material to bidirectional stirring and shearing forces during extrusion, resulting in more thorough mixing and improved mixing uniformity, thereby enhancing product quality. A mixing disc and mixing channel are incorporated; the mixing disc rotates with the screw, and as the material passes through the mixing channel, its flow direction and speed continuously change, further enhancing the mixing effect.

[0022] 2. The feeding section of this utility model facilitates stable material conveying, the mixing section centrally mixes the color masterbatch, and the discharge end ensures uniform extrusion of the mixed material. This structure optimizes the extrusion process and improves production efficiency and product quality. Two mixing discs are located on either side of the mixing section. The material first enters the first mixing disc closest to the feeding section, where it still maintains high fluidity. The mixing discs perform initial diversion and reorganization of the material through the mixing channel, dispersing large pieces of material into multiple fine streams. After passing through the first mixing disc, the material moves to the second mixing disc under the reverse shearing action of the screw and the drum. The second mixing disc further agitates the material, enhancing the mixing effect.

[0023] 3. By setting protruding ridges, this utility model can block and disturb the material, making the flow of the material on the surface of the mixing disc more complex, increasing the degree of material tumbling and mixing. The gradual change in the height of adjacent protruding ridges further enhances this disturbance effect, which is beneficial to improving the mixing quality. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0025] Figure 2 This is a schematic diagram of the extrusion cavity structure in an embodiment of this application.

[0026] Figure 3 This is a schematic diagram of the rotating drum structure according to an embodiment of this application.

[0027] Figure 4 This is a schematic diagram of the screw structure according to an embodiment of this application.

[0028] Figure 5 It is along Figure 4 Enlarged view of point A in the middle.

[0029] Figure 6 This is a schematic diagram of the mixing tray structure in an embodiment of this application.

[0030] Figure 7 It is along Figure 2 Enlarged view of point B in the middle.

[0031] Explanation of reference numerals in the attached drawings: 1. Machine body; 2. Extrusion chamber; 21. Feeding section; 22. Mixing section; 23. Discharge end; 3. Screw; 4. Rotary drum; 5. Drive assembly; 51. Motor; 52. Idler wheel; 53. Gear column; 54. Gear; 55. Gear ring; 6. Storage tank; 7. Mixing disc; 8. Mixing channel; 9. Baffle blade; 10. Rib. Detailed Implementation

[0032] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail to make the technical solution of this application easier to understand and master.

[0033] This application discloses a flame-retardant plastic masterbatch extruder.

[0034] Reference Figure 2 and Figure 4 This embodiment of a flame-retardant plastic masterbatch extruder includes a machine body 1 with an extrusion chamber 2 and a screw 3 rotatably connected within the extrusion chamber 2. It also includes a rotary drum 4 and a drive assembly 5. The extrusion chamber 2 includes a feeding section 21, a mixing section 22, and a discharge end 23. A storage tank 6 communicating with the feeding section 21 is fixedly connected to the machine body 1. The rotary drum 4 is coaxially and rotatably connected to the mixing section 22. The screw 3 is coaxially connected to and passes through the rotary drum 4, with the screw 3 and the rotary drum 4 rotating in opposite directions. Two mixing discs 7 are coaxially and fixedly connected to the screw 3, located on opposite sides of the mixing section 22. Multiple mixing channels 8 are evenly distributed on the mixing discs 7. The drive assembly 5 simultaneously drives the rotation of both the screw 3 and the rotary drum 4.

[0035] Reference Figure 1 and Figure 2 The rotating drum 4 and screw 3 rotate in opposite directions, subjecting the material to bidirectional stirring and shearing forces during extrusion. This results in more thorough mixing, improving mixing uniformity and thus enhancing product quality. A mixing disc 7 and a mixing channel 8 are also included. The mixing disc 7 rotates with the screw 3, and as the material passes through the mixing channel 8, its flow direction and speed continuously change, further enhancing the mixing effect.

[0036] Reference Figure 1 and Figure 2 Raw materials, including 30 parts resin carrier, 40 parts toughening agent, 30 parts pigment, 8 parts filler, and 4 parts dispersant, are weighed according to weight and pre-dispersed in a high-speed mixer to obtain a mixture. This mixture is then fed into an extruder, entering the feed section 21 through the barrel. The feed section 21 facilitates stable material transport. The mixing section 22 focuses on mixing the color masterbatch, while the discharge end 23 ensures uniform extrusion of the mixed material. This structure optimizes the extrusion process, improving production efficiency and product quality. Two mixing discs 7 are located on either side of the mixing section 22. The material first enters the first mixing disc 7, which is closer to the feed section 21, where it still maintains high fluidity. The mixing disc 7 performs initial diversion and reorganization of the material through the mixing channel 8, dispersing large pieces of material into multiple fine streams. After passing through the first mixing disc 7, the material moves to the second mixing disc 7 under the reverse shearing action of the screw 3 and the drum 4. The second mixing disc 7 further agitates the material, enhancing the mixing effect.

[0037] Reference Figure 5 and Figure 6 The multiple mixing channels 8 are divided into multiple groups. Within each group of mixing channels 8, the distance between the central axis of the multiple mixing channels 8 and the side closest to the feed section 21 gradually decreases. This causes the material flow path to differ as the material passes through the mixing channels 8, forming a complex flow field, thereby increasing the chances of collision and mixing between materials and improving the uniformity and fineness of the mixing.

[0038] Reference Figure 4 and Figure 5 Several protruding ribs 10 are fixedly connected to the two end faces of the two mixing discs 7, and the height between adjacent protruding ribs 10 gradually changes. The protruding ribs 10 will block and disturb the material, making the flow of the material on the surface of the mixing discs 7 more complex, increasing the degree of material tumbling and mixing. The gradual change in the height of adjacent protruding ribs 10 further enhances this disturbance effect, which is beneficial to improving the mixing quality.

[0039] Reference Figure 3 The inner wall of the rotating drum 4 is uniformly and fixedly connected with several flow-disrupting blades 9 around its circumference. These blades alter the flow state of the material within the rotating drum 4, preventing the material from simply rotating with it, increasing the residence time and mixing opportunities within the drum 4, and improving the mixing effect. The outer surface of the flow-disrupting blades 9 has rough textures. These textures increase the friction between the blades and the material, making the flow of the material on the blade surface more turbulent, further enhancing the turbulence effect and helping to improve the uniformity of material mixing.

[0040] Reference Figure 2 and Figure 7The drive assembly 5 includes a motor 51, an idler wheel 52, and a gear 53. A gear 54 is coaxially and fixedly connected to the screw 3, and a gear ring 55 is coaxially and fixedly connected to the drum 4. The gear 53 and idler wheel 52 are rotatably connected to the machine body 1, and are meshed with each other. The gear 53 meshes with the gear ring 55, and the idler wheel 52 meshes with the gear 54. The motor 51 is fixedly connected to the machine body 1, and one end of the output shaft of the motor 51 is coaxially and fixedly connected to the screw 3. The motor 51 provides power, and the gear 53 and idler wheel 52 work together to transmit force and change its direction, enabling the screw 3 and the drum 4 to rotate in opposite directions as designed. This structure is simple and reliable, has high transmission efficiency, and is easy to install and maintain, while ensuring the stability and accuracy of the rotation of the screw 3 and the drum 4.

[0041] Of course, the above are just typical examples of this application. In addition, this application may have many other specific implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed in this application.

Claims

1. A flame-retardant plastic masterbatch extruder, comprising a machine body (1) with an extrusion chamber (2) and a screw (3), wherein the screw (3) is rotatably connected within the extrusion chamber (2), characterized in that: It also includes a rotating drum (4) and a drive assembly (5). The rotating drum (4) is coaxial with the screw (3) and rotatably connected in the extrusion chamber (2). The screw (3) is coaxial and passes through the rotating drum (4), and the rotation directions of the screw (3) and the rotating drum (4) are opposite. A mixing disc (7) is coaxially and fixedly connected to the screw (3). Multiple mixing channels (8) are opened and evenly distributed on the mixing disc (7). The drive assembly (5) is used to drive the rotation of the screw (3) and the rotating drum (4) simultaneously.

2. The flame-retardant plastic masterbatch extruder according to claim 1, characterized in that: The extrusion chamber (2) includes a feeding section (21), a mixing section (22) and a discharge end (23). The machine body (1) is provided with several storage tanks (6) that are connected to the feeding section (21). There are two mixing discs (7), which are located on both sides of the mixing section (22). The rotating drum (4) is rotatably connected to the mixing section (22).

3. The flame-retardant plastic masterbatch extruder according to claim 2, characterized in that: The multiple mixing channels (8) are divided into multiple groups, and the distance between the central axis of the multiple mixing channels (8) in each group and the side closer to the feed section (21) and the side farther away from the feed section (21) gradually becomes closer.

4. The flame-retardant plastic masterbatch extruder according to claim 2, characterized in that: Several protruding ridges (10) are provided on the two end faces of the two mixing discs (7), and the height between adjacent protruding ridges (10) gradually changes.

5. The flame-retardant plastic masterbatch extruder according to claim 1, characterized in that: The inner wall of the rotating cylinder (4) is provided with a few turbulence blades (9) around its circumference.

6. The flame-retardant plastic masterbatch extruder according to claim 5, characterized in that: The outer surface of several of the aforementioned turbulence blades (9) is provided with rough texture.

7. The flame-retardant plastic masterbatch extruder according to claim 1, characterized in that: The drive assembly (5) includes a motor (51), an idler wheel (52), and a gear (53). A gear (54) is coaxially and fixedly connected to the screw (3). A gear ring (55) is coaxially and fixedly connected to the drum (4). The gear (53) and the idler wheel (52) are rotatably connected to the machine body (1). The gear (53) and the idler wheel (52) are meshed with each other, and the gear (53) and the idler wheel (52) are meshed with the gear ring (55) and the gear (54) respectively. The motor (51) is fixedly connected to the machine body (1). One end of the output shaft of the motor (51) is coaxially and fixedly connected to the screw (3).

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