Rotor structure of continuous internal mixer suitable for as carrier black masterbatch

Abstract

The utility model provides a kind of rotor structure of AS carrier black masterbatch suitable for continuous internal mixer, belong to chemical colour masterbatch production technical field, the rotor structure of this AS carrier black masterbatch suitable for continuous internal mixer includes rotor body, and rotor body is sequentially provided with conveying section and mixing section along axial direction, conveying section is fixedly connected with mixing section and the axial center line of two is collinear;The outer peripheral surface of conveying section is equipped with conveying thread, and the pitch of conveying thread gradually decreases from the direction close to conveying section feed end to close to mixing section;The height of screw rib of conveying thread gradually increases from the direction close to conveying section feed end to close to mixing section;The outer peripheral surface of mixing section is equipped with mixing screw rib, and the angle of mixing screw rib is 30 °-60 °, and the length of mixing section is 1.2-2 times of conveying section length;It is difficult to realize AS resin, auxiliary agent and carbon black in AS carrier black masterbatch processing in traditional continuous internal mixer rotor structure, leading to poor product quality.

Description

Technical Field

[0001] This utility model belongs to the field of chemical masterbatch production technology, specifically, it relates to a rotor structure for a continuous internal mixer suitable for AS carrier black masterbatch. Background Technology

[0002] AS carrier black masterbatch is a functional masterbatch made by adding additives and carbon black to AS resin as a carrier. It is widely used in the plastics processing field and can endow products with excellent coloring properties and certain mechanical properties. Continuous internal mixers, as highly efficient mixing equipment, are widely used in the processing of AS carrier black masterbatch due to their continuous production, high production efficiency, and good mixing effect. The core working component is the rotor, and the structure of the rotor directly affects the mixing and dispersion effect of the material and the production efficiency.

[0003] In traditional AS carrier black masterbatch processing, the rotor structure of continuous internal mixers has several drawbacks. Traditional rotors typically employ a constant pitch design in the conveying section, with consistent screw height. This results in gradual pressure changes on the material during transport, leading to insufficient mixing of AS resin and additives, hindering adequate premixing and consequently affecting the dispersion of carbon black. Furthermore, the screw angle design in the mixing section of traditional rotors is unreasonable, resulting in insufficient shear force. The short mixing section length also leads to insufficient residence time and mixing cycles, making it difficult for carbon black to disperse evenly in the AS resin, easily causing carbon black agglomeration and affecting the quality of the black masterbatch. In addition, traditional rotors are mostly made of ordinary steel without special surface treatment. When processing high-temperature, high-strength materials for extended periods, they are prone to wear and deformation, resulting in a short service life and frequent replacements, increasing production costs and downtime. Moreover, the connection between the conveying section and the mixing section of the traditional rotor is unreasonable, often with gaps or abrupt transitions, which makes it easy for materials to accumulate or stagnate at the transition points. This not only affects the continuous processing of materials, but may also cause material contamination and further reduce product quality. Utility Model Content

[0004] In view of this, the present invention provides a rotor structure for a continuous internal mixer suitable for AS carrier black masterbatch, which solves the problem that the traditional rotor structure of the continuous internal mixer is difficult to achieve sufficient dispersion of AS resin, additives and carbon black in the processing of AS carrier black masterbatch, resulting in poor product quality.

[0005] This utility model is implemented as follows:

[0006] This utility model provides a rotor structure for a continuous internal mixer suitable for AS carrier black masterbatch, comprising a rotor body, wherein the rotor body is provided with a conveying section and a mixing section sequentially along the axial direction, the conveying section and the mixing section are fixedly connected and their axis centers are collinear; the outer peripheral surface of the conveying section is provided with a conveying thread, the pitch of the conveying thread gradually decreases from the direction near the feed end of the conveying section to the direction near the mixing section; the height of the thread ridge of the conveying thread gradually increases from the direction near the feed end of the conveying section to the direction near the mixing section; the outer peripheral surface of the mixing section is provided with a mixing thread ridge, the angle of the mixing thread ridge is 30°-60°, and the length of the mixing section is 1.2-2 times the length of the conveying section; the outer surface of the rotor body is coated with a tungsten carbide layer.

[0007] The end face of the conveying section near the mixing section is fixedly connected to the end face of the mixing section near the conveying section by welding, and the weld seam is continuously distributed along the circumference of the connection end face; or the conveying section and the mixing section are fixedly connected by key connection with interference fit, that is, the connection end of the conveying section is provided with an external key, and the connection end of the mixing section is provided with a keyway adapted to the external key. After the external key is embedded in the keyway, the mating surfaces of the two are fixed axially and circumferentially by interference fit.

[0008] The angle of the mixing screw is 30°-60° (relative to the radial plane of the rotor body). This angle range allows the shear force on the material during the mixing process to increase with the increase of the angle, while also increasing the number of times the material is turned over in the mixing section. The length of the mixing section is 1.2-2 times the length of the conveying section. By extending the mixing path, the residence time of the material in the mixing section is increased, thereby improving the mixing effect.

[0009] Based on the above technical solution, the rotor structure of the AS carrier black masterbatch applicable to the continuous internal mixer of this utility model can be further improved as follows:

[0010] The conveying thread of the conveying section is a continuous helical structure. The starting end of the conveying thread is located at the edge of the feed end of the conveying section, and the end of the conveying thread is connected to the starting end of the mixing section.

[0011] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the continuous spiral conveying thread extends from the feed end to the mixing section, ensuring the continuity of material conveying, avoiding material accumulation at the transition point, and enabling AS resin and additives to be continuously mixed during the conveying process, laying a stable foundation for subsequent carbon black dispersion.

[0012] Furthermore, the mixing screw extends spirally along the axial direction of the mixing section, and the starting end of the mixing screw smoothly transitions to the end of the conveying thread.

[0013] The beneficial effects of adopting the above-mentioned improvement scheme are: the smooth transition connection between the mixing screw and the conveying screw reduces the material flow resistance, avoids material stagnation caused by sudden changes in local pressure, ensures a smooth transition of material from conveying to mixing, and improves the overall processing efficiency.

[0014] Furthermore, the length of the mixing section is greater than the length of the conveying section.

[0015] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the length of the mixing section is greater than that of the conveying section, which further extends the residence time of the material in the mixing section, allowing the carbon black to have more time to mix with AS resin and additives, thereby improving the dispersion uniformity and reducing agglomeration.

[0016] Furthermore, the cross-section of the threaded edge of the conveying thread is trapezoidal, with the upper base of the trapezoid facing away from the axis of the rotor body, and the lower base of the trapezoid being fixedly connected to the outer circumferential surface of the rotor body.

[0017] Fixed connections are achieved through welding or key connections with interference fits.

[0018] Furthermore, the cross-section of the mixing screw is rectangular, one side of the rectangle is fixedly connected to the outer peripheral surface of the rotor body, and the other side of the rectangle faces away from the axis of the rotor body.

[0019] The mixing screw and the outer peripheral surface of the rotor body are integrally formed, that is, the mixing screw and the rotor body are formed into an inseparable whole through forging or casting process; or the mixing screw is fixed to the outer peripheral surface of the rotor body by welding, with the welding points distributed at intervals along the length direction of the mixing screw, and the welding surface is completely attached to the outer peripheral surface of the rotor body.

[0020] Furthermore, the tungsten carbide layer covers the entire outer surface of the rotor body, including the conveying thread surface of the conveying section and the mixing thread surface of the mixing section.

[0021] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the uniform tungsten carbide layer covering the entire surface improves the wear resistance and high temperature resistance of the rotor, avoids structural failure caused by local wear, extends the overall service life of the rotor, and reduces maintenance costs.

[0022] Furthermore, the conveying section and the mixing section are integrally formed.

[0023] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the integral molding of the conveying section and the mixing section reduces the connection gaps, avoids the pollution caused by material residue in the gaps, and enhances the overall rigidity of the rotor to meet the stress requirements under high-speed rotation.

[0024] Furthermore, the number of mixing screws is at least two, and the multiple mixing screws are evenly distributed along the circumference of the mixing section.

[0025] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: multiple circumferentially evenly distributed mixing screws subject the material to multi-directional shear forces, avoid local mixing dead zones, improve mixing uniformity, and ensure that carbon black is uniformly dispersed in AS material.

[0026] Furthermore, the length of the conveying section is 1 / 3 to 1 / 2 of the total length of the rotor body, and the rotor body is made of SKD-61.

[0027] The beneficial effects of adopting the above-mentioned improvement scheme are: the proportion of the conveyor section length is reasonable, which not only ensures the time and pressure required for material premixing, but also avoids energy waste caused by excessively long conveyor sections, thus balancing the efficiency of premixing and compounding. SKD61 is a hot work die steel.

[0028] Compared with the prior art, the beneficial effects of the rotor structure of the AS carrier black masterbatch suitable for continuous internal mixer provided by this utility model are:

[0029] From the overall processing effect, this rotor structure can achieve gradual and thorough mixing of AS resin, additives, and carbon black, significantly improving the quality of AS carrier black masterbatch. The conveying section adopts a design with gradually changing screw pitch and gradually increasing screw height, which gradually increases the pressure on the material during the conveying process, promoting the initial melting of AS resin and thorough premixing with additives, laying a good foundation for the subsequent dispersion of carbon black, and effectively avoiding the problem of uneven carbon black dispersion caused by insufficient premixing;

[0030] By rationally setting the screw angle and length, the mixing section enhances the shear force on the material, prolongs the residence time of the material in the mixing section, and increases the number of mixing times, so that the carbon black can be more evenly dispersed in AS resin, reducing carbon black agglomeration and improving the coloring power and mechanical properties of the black masterbatch.

[0031] In terms of structural stability and service life, the rotor is made of SKD-61 material and coated with tungsten carbide on the outside, which significantly improves the rotor's wear resistance and high temperature resistance. It can adapt to high-intensity and high-temperature material processing environments, reduce rotor wear and deformation, extend its service life, reduce replacement frequency and production costs, and reduce production losses caused by downtime to replace the rotor.

[0032] Meanwhile, the connection between the rotor components is reasonable, the fixed connection between the conveying section and the mixing section, as well as the connection between the mixing screw and the rotor body are firm and reliable, reducing the problems of connection gaps and abrupt transitions, avoiding the accumulation and retention of materials at the transition points, ensuring the continuity of material processing, reducing material contamination, and further improving the stability of product quality. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model 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.

[0034] Figure 1 An example diagram of a rotor structure for a continuous internal mixer using an AS carrier black masterbatch.

[0035] Figure 2 An oblique view of the rotor structure of a continuous internal mixer for an AS carrier black masterbatch.

[0036] Figure 3 for Figure 1 Enlarged view of section A in the middle;

[0037] The attached diagram lists the components represented by each number as follows:

[0038] 10. Rotor body; 11. Conveying section; 111. Conveying thread; 12. Mixing section; 121. Mixing thread. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0040] like Figures 1-3 The diagram shown is an example of the rotor structure of a continuous internal mixer for AS carrier black masterbatch provided by this utility model. It includes a rotor body 10, with a conveying section 11 and a mixing section 12 arranged sequentially along the axial direction. The conveying section 11 and the mixing section 12 are fixedly connected, and their axes are collinear. The outer circumferential surface of the conveying section 11 is provided with a conveying thread 111, the pitch of which gradually decreases from near the feed end of the conveying section 11 towards the mixing section 12. The height of the thread ridge of the conveying thread 111 gradually increases from near the feed end of the conveying section 11 towards the mixing section 12. The outer circumferential surface of the mixing section 12 is provided with a mixing thread ridge 121, the angle of which is 30°-60°. The length of the mixing section 12 is 1.2-2 times the length of the conveying section 11. The outer surface of the rotor body 10 is coated with a tungsten carbide layer.

[0041] Specific usage steps:

[0042] Install the rotor structure of this utility model into the mixing chamber of a continuous internal mixer, ensure that the gap between the rotor and the chamber is appropriate, connect the drive device and check the operational stability.

[0043] AS resin and additives are fed into the internal mixer through the feed inlet in proportion, and the material enters the conveying section of the rotor under the action of gravity.

[0044] As the rotor rotates, the gradually changing pitch and screw height of the conveying section cause the material to be pushed forward with the screw thread, and the pressure gradually increases. The AS resin initially melts and mixes with the additives, completing the premixing process during the conveying process.

[0045] The premixed material enters the mixing section, where the carbon black (which can be added simultaneously during feeding or supplemented at the end of the conveying section) is gradually dispersed under the shearing and kneading action of the multi-angle screw ribs. The length of the mixing section ensures that the material is fully mixed, ultimately forming a uniform AS carrier black masterbatch.

[0046] The dispersed black masterbatch is discharged from the outlet of the internal mixer and enters the subsequent processing stage. The rotor continues to run to achieve continuous production.

[0047] In the above technical solution, the conveying thread 111 of the conveying section 11 is a continuous spiral structure. The starting end of the conveying thread 111 is located at the edge of the feed end of the conveying section 11, and the end of the conveying thread 111 is connected to the starting end of the mixing section 12.

[0048] Furthermore, in the above technical solution, the mixing screw 121 extends spirally along the axial direction of the mixing section 12, and the starting end of the mixing screw 121 is smoothly connected to the end of the conveying thread 111.

[0049] Furthermore, in the above technical solution, the length of the mixing section 12 is greater than the length of the conveying section 11.

[0050] Furthermore, in the above technical solution, the cross-section of the thread 111 of the conveying thread is trapezoidal, with the upper base of the trapezoid facing away from the axis of the rotor body 10, and the lower base of the trapezoid being fixedly connected to the outer circumferential surface of the rotor body 10.

[0051] Furthermore, in the above technical solution, the cross-section of the mixing screw 121 is rectangular, one side of the rectangle is fixedly connected to the outer peripheral surface of the rotor body 10, and the other side of the rectangle faces away from the axis of the rotor body 10.

[0052] Furthermore, in the above technical solution, the tungsten carbide layer covers the entire outer surface of the rotor body 10, including the surface of the conveying thread 111 of the conveying section 11 and the surface of the mixing thread 121 of the mixing section 12.

[0053] Furthermore, in the above technical solution, the conveying section 11 and the mixing section 12 are integrally formed structures.

[0054] Furthermore, in the above technical solution, the number of mixing screws 121 is at least two, and multiple mixing screws are evenly distributed along the circumference of the mixing section 12.

[0055] Furthermore, in the above technical solution, the length of the conveying section 11 is 1 / 3 to 1 / 2 of the total length of the rotor body 10, and the material of the rotor body 10 is SKD-61.

[0056] First embodiment:

[0057] The rotor structure of the AS carrier black masterbatch applicable continuous internal mixer in this embodiment includes a rotor body, which has a conveying section and a mixing section arranged sequentially along the axial direction. The conveying section and the mixing section are fixedly connected by welding, with their centerlines collinear. The weld seams are continuously distributed circumferentially along the connection end face to ensure a firm connection and no material retention gaps.

[0058] The outer circumference of the conveying section is provided with a continuous spiral conveying thread. The pitch of the conveying thread gradually decreases from near the feed end to near the mixing section, while the height of the spiral ridges gradually increases from near the feed end to near the mixing section. The cross-section of the spiral ridges is trapezoidal, with the upper base facing away from the rotor body's axis of rotation, and the lower base fixedly connected to the outer circumference of the rotor body. The outer circumference of the mixing section is provided with four evenly distributed mixing spiral ridges along the circumference. The mixing spiral ridges extend spirally along the axial direction of the mixing section, with the starting end smoothly transitioning to the end of the conveying thread. The angle of the mixing spiral ridges is set to 45°. The length of the mixing section is 1.5 times the length of the conveying section. The cross-section of the mixing spiral ridges is rectangular, with one side of the rectangle integrally formed and connected to the outer circumference of the rotor body. The rotor body is made of SKD-61, with a tungsten carbide layer covering the entire surface sprayed on its outer surface. The length of the conveying section is 1 / 3 of the total length of the rotor body.

[0059] This embodiment is suitable for small- to medium-scale production of AS carrier black masterbatch, especially in scenarios where high material purity is required. The welded connection and integrally formed compounding screw threads reduce connection gaps, preventing material residue contamination and ensuring product purity; the four compounding screw threads provide balanced shear force, meeting conventional dispersion needs.

[0060] Second embodiment:

[0061] The rotor structure of the AS carrier black masterbatch applicable to the continuous internal mixer in this embodiment also includes a rotor body, with a conveying section and a mixing section arranged sequentially along the axial direction. The conveying section and the mixing section are fixedly connected by a key and an interference fit. The connecting end of the conveying section is provided with an external key, and the connecting end of the mixing section is provided with a matching keyway. After the external key is embedded in the keyway, the mating surfaces of the two are fixed in the axial and circumferential directions by an interference fit, and the centerlines are collinear.

[0062] The outer circumferential surface of the conveying section is provided with a continuous spiral conveying thread. The pitch gradually decreases from near the feed end to near the mixing section, and the height of the spiral ridge gradually increases from near the feed end to near the mixing section. The cross-section of the spiral ridge is trapezoidal, and its fixed connection with the outer circumferential surface of the rotor body is the same as in Embodiment 1. The outer circumferential surface of the mixing section is provided with six mixing spiral ridges evenly distributed circumferentially, extending spirally along the axial direction of the mixing section. The starting end smoothly transitions to the end of the conveying thread. The angle of the mixing spiral ridges is set to 50°. The length of the mixing section is 1.8 times the length of the conveying section. The cross-section of the mixing spiral ridges is rectangular. One side of the rectangle is fixedly connected to the outer circumferential surface of the rotor body by welding. The welding points are spaced apart along the length of the mixing spiral ridges, and the welding surface is completely in contact with the outer circumferential surface of the rotor body. The rotor body is made of SKD-61 material, and the outer surface is fully coated with a tungsten carbide layer. The length of the conveying section is 1 / 2 of the total length of the rotor body.

[0063] This embodiment is suitable for large-scale, high-intensity AS carrier black masterbatch production, especially for scenarios with extremely high requirements for carbon black dispersion. The keyed connection and interference fit facilitate the replacement and maintenance of rotor components, adapting to long-term high-intensity operation requirements; the six mixing screw ribs enhance shearing force and mixing cycles.

[0064] Specifically, the principle of this utility model is as follows:

[0065] In the conveying section, the core principle is to utilize a structure with gradually changing screw pitch and gradually increasing screw height to alter the stress state of the material during conveying. As the rotor rotates, the conveying thread propels the material axially. As the screw pitch gradually decreases, the number of screw turns per unit length increases, resulting in more compression cycles on the material within the same time frame. Simultaneously, the screw height gradually increases, reducing the gap between the material and the screw, thus increasing the compressive pressure on the material. This gradual change in pressure causes the AS resin to gradually melt during conveying, while the additives, under pressure, fully contact and mix with the AS resin, achieving material premixing. The continuous spiral conveying thread ensures the continuity of material conveying, preventing interruptions or accumulation during transport and ensuring stable premixing.

[0066] Once in the mixing section, the main technical principle is to enhance the shearing and kneading effect on the material through a reasonable design of the screw angle and length. The angle of the mixing screw determines the direction and magnitude of the shearing force. A suitable angle allows the material to be subjected to shearing force along the inclined surface of the screw while rotating with the rotor. This shearing force causes relative motion within the material, promoting the crushing and dispersion of carbon black particles. The length of the mixing section directly affects the residence time of the material in the mixing section. A longer length provides sufficient mixing time, allowing the carbon black more opportunities to contact and mix with AS resin and additives. Multiple circumferentially evenly distributed mixing screws allow the material to be subjected to shearing forces in multiple directions during rotation, avoiding mixing dead zones caused by shearing in one direction, and further improving the uniformity of mixing.

[0067] In terms of material selection, SKD-61 material has high strength and wear resistance, and can withstand high pressure and friction during material processing; while the external tungsten carbide coating further improves the surface hardness and wear resistance of the rotor, enhances the rotor's resistance to high temperature and wear, and ensures the structural stability and service life of the rotor during long-term high-intensity processing.

[0068] The fixed connection and collinear axis design between the conveying section and the mixing section ensures the balance and stability of the rotor during rotation, avoiding rotor vibration or eccentricity caused by improper connection, and reducing energy loss and equipment wear. The smooth transition connection between the mixing screw and the conveying screw reduces the flow resistance of materials at the transition point, allowing materials to smoothly enter the mixing section from the conveying section, ensuring the continuity of the processing and improving overall processing efficiency.

Claims

1. A rotor structure for a continuous internal mixer using an AS carrier black masterbatch, characterized in that, The rotor body includes a conveying section and a mixing section arranged sequentially along the axial direction. The conveying section and the mixing section are fixedly connected and their axes are collinear. The outer circumferential surface of the conveying section is provided with a conveying thread, the pitch of which gradually decreases from the feed end of the conveying section towards the mixing section. The height of the thread ridges of the conveying thread gradually increases from the feed end of the conveying section towards the mixing section. The outer circumferential surface of the mixing section is provided with mixing thread ridges, the angle of which is 30°-60°. The length of the mixing section is 1.2-2 times the length of the conveying section. The outer surface of the rotor body is coated with a tungsten carbide layer.

2. The rotor structure of an AS carrier black masterbatch suitable for a continuous internal mixer according to claim 1, characterized in that, The conveying thread of the conveying section is a continuous helical structure. The starting end of the conveying thread is located at the edge of the feed end of the conveying section, and the end of the conveying thread is connected to the starting end of the mixing section.

3. The rotor structure of an AS carrier black masterbatch suitable for a continuous internal mixer according to claim 2, characterized in that, The mixing screw extends spirally along the axial direction of the mixing section, and the starting end of the mixing screw smoothly transitions to the end of the conveying thread.

4. The rotor structure of an AS carrier black masterbatch suitable for a continuous internal mixer according to claim 3, characterized in that, The length of the mixing section is greater than the length of the conveying section.

5. The rotor structure of an AS carrier black masterbatch suitable for a continuous internal mixer according to claim 4, characterized in that, The cross-section of the threaded edge of the conveying thread is trapezoidal, with the upper base of the trapezoid facing away from the axis of the rotor body, and the lower base of the trapezoid being fixedly connected to the outer circumferential surface of the rotor body.

6. The rotor structure of an AS carrier black masterbatch suitable for a continuous internal mixer according to claim 5, characterized in that, The cross-section of the mixing screw is rectangular, one side of the rectangle is fixedly connected to the outer peripheral surface of the rotor body, and the other side of the rectangle faces away from the axis of the rotor body.

7. The rotor structure of an AS carrier black masterbatch suitable for a continuous internal mixer according to claim 6, characterized in that, The tungsten carbide layer covers the entire outer surface of the rotor body, including the conveying thread surface of the conveying section and the mixing thread surface of the mixing section.

8. The rotor structure of an AS carrier black masterbatch suitable for a continuous internal mixer according to claim 7, characterized in that, The conveying section and the mixing section are integrally formed.

9. The rotor structure of an AS carrier black masterbatch suitable for a continuous internal mixer according to claim 8, characterized in that, The number of mixing screws is at least two, and the multiple mixing screws are evenly distributed along the circumference of the mixing section.

10. The rotor structure of an AS carrier black masterbatch suitable for a continuous internal mixer according to claim 9, characterized in that, The length of the conveying section is 1 / 3 to 1 / 2 of the total length of the rotor body, and the rotor body is made of SKD-61.

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