High torque co-rotating parallel twin screw extruder

Abstract

The application relates to a high-torque parallel double-screw extruder, and relates to the field of double-screw extruders. The high-torque parallel double-screw extruder comprises a rack, a barrel mounted on the rack, a first screw and a second screw mounted in the barrel, a driving assembly mounted on the rack and used for driving the first screw and the second screw to rotate in the same direction, a feeding hopper mounted on the barrel, a mixing device mounted in the feeding hopper, wherein the mixing device comprises a mixing motor and a mixing roller, a support frame arranged at an opening of an upper end of the feeding hopper, the mixing motor is mounted on the support frame, the mixing roller is fixedly connected with an output shaft of the mixing motor, and the mixing roller is arranged along a height direction of the feeding hopper, and stirring blades are arranged on the mixing roller. The application has the effects of fully mixing materials and avoiding material adhesion.

Description

Technical Field

[0001] This application relates to the field of twin-screw extruders, and more particularly to a high-torque co-rotating parallel twin-screw extruder. Background Technology

[0002] In recent years, with the rapid development of the plastics industry, the demand for plastics processing equipment has been increasing. Traditional single-screw extruders can no longer meet the requirements of high-quality and high-efficiency production. Twin-screw extruders, due to their excellent mixing performance and high production capacity, have been widely used in the field of plastics processing.

[0003] Existing twin-screw extruders typically have a feed hopper installed on the barrel. The operator adds the material into the feed hopper, which then enters the barrel and is extruded and cut into shape by the twin screws. Because the material is directly added into the feed hopper, some materials may not mix sufficiently due to their structural composition, and the material may stick and clog the feed hopper, thus affecting the quality of the finished product. Summary of the Invention

[0004] In order to ensure thorough mixing of materials and prevent material sticking, this application provides a high-torque co-rotating parallel twin-screw extruder.

[0005] This application provides a high-torque co-rotating parallel twin-screw extruder with the following technical solution:

[0006] A high-torque co-rotating parallel twin-screw extruder includes a frame, a barrel mounted on the frame, a first screw and a second screw installed inside the barrel, a drive assembly mounted on the frame to drive the first screw and the second screw to rotate in the same direction, a feed hopper mounted on the barrel, a mixing device installed inside the feed hopper, the mixing device including a mixing motor and a mixing roller, a support frame provided at the upper opening of the feed hopper, the mixing motor mounted on the support frame, the mixing roller fixedly connected to the output shaft of the mixing motor and arranged along the height direction of the feed hopper, and stirring blades provided on the mixing roller.

[0007] By adopting the above technical solutions, the mixing motor and mixing rollers ensure that the material is pre-mixed before entering the barrel, improving the mixing uniformity and preventing product quality degradation due to uneven mixing. The mixing blades further enhance the mixing effect, ensuring that the material reaches a good mixing state before entering the twin-screw extruder, reducing the risk of material sticking and clogging the feed hopper, and improving production efficiency and product quality.

[0008] In one specific implementation scheme, the mixing device further includes mixing partitions, at least two of which are provided. The mixing partitions are arranged along the height direction of the feed hopper, and the dimensions of the mixing partitions correspond to the inner diameters of different height positions of the feed hopper. Different mixing chambers are formed between adjacent mixing partitions. The mixing partitions are provided with material passage holes, and the material passage holes on the mixing partitions located at different height positions are staggered. The mixing rollers are equipped with several sets of pusher blocks corresponding to different mixing partitions, and the several sets of pusher blocks are slidably connected to the upper plate surfaces of different mixing partitions.

[0009] By adopting the above technical solution, the mixing baffles create multiple mixing chambers inside the feed hopper. The dimensions of the mixing baffles at different heights correspond to the changes in the inner diameter of the feed hopper, ensuring that the material is thoroughly mixed in each mixing chamber. The staggered arrangement of the material passages effectively prevents material adhesion and blockage, improving material flowability and mixing uniformity. The design of the pusher blocks further enhances the propulsion force of the material in each mixing chamber, ensuring smooth passage of the material through the mixing device and improving mixing efficiency and quality.

[0010] In one specific implementation scheme, a plurality of material passage holes are provided, which are evenly distributed on the circumferential part of the mixing partition, and the number of push blocks in each group corresponds to the number of material passage holes.

[0011] By adopting the above technical solution, the multiple material passages on the mixing partition are evenly distributed, allowing the material to be distributed more evenly in different mixing chambers and avoiding local accumulation. Simultaneously, the number of push blocks in each group corresponds to the number of material passages, ensuring that each passage has a corresponding push block for pushing, further improving material conveying efficiency and mixing effect, effectively preventing material adhesion and blockage, and enhancing the quality of the final product.

[0012] In one specific implementation scheme, the pusher block is inclined on the side wall corresponding to the rotation of the output shaft of the mixing motor, and the thickness of the pusher block gradually decreases from bottom to top.

[0013] By adopting the above technical solution, the sidewalls of the pusher block are inclined and the thickness gradually decreases from bottom to top. This allows the pusher block to more effectively push the material downwards as it rotates with the mixing roller, preventing material from accumulating or stagnating in the mixing chamber. Simultaneously, this design reduces the frictional resistance between the pusher block and the mixing baffle, improving the working efficiency and stability of the mixing device.

[0014] In one specific implementation, the stirring blades are provided in several groups, and the several groups of stirring blades are installed in different mixing chambers.

[0015] By adopting the above technical solution, multiple sets of stirring blades are set and installed in different mixing chambers, which can effectively improve the mixing uniformity of materials in each mixing chamber, reduce material adhesion and blockage, and thus improve the quality of the final product and production efficiency.

[0016] In one specific implementation scheme, an air inlet is installed on the outer wall of the feed hopper, an air passage is provided inside the side wall of the feed hopper, and a number of air outlets are provided on the side walls of different mixing chambers inside the feed hopper. The number of air outlets are evenly distributed on the circumferential part of the inner side wall of the feed hopper, and the air outlets are connected to the air passage.

[0017] By adopting the above technical solutions, the mixing motor and mixing roller in the mixing device can effectively agitate the materials, ensuring that the materials are fully mixed before entering the hopper. The design of the mixing baffle allows the materials to be mixed gradually in different mixing chambers, further improving the mixing effect. The inclined design and thickness variation of the pusher block help push the materials downwards, preventing material accumulation. The multiple sets of mixing blades further enhance the mixing effect. The introduction of air inlets and air pipes, combined with the design of air outlets, allows for the uniform injection of gas into the mixing chamber, helping to loosen the materials, reduce adhesion, and improve material flowability, thereby avoiding clogging of the feed hopper and improving the quality of the finished product. The conical design of the guide plate facilitates the smooth entry of materials into the next mixing chamber, ensuring uniform material distribution. At the same time, hot air can be blown into the feed hopper by devices such as hot air blowers, further ensuring the dryness of the materials.

[0018] In one specific implementation, a guide plate is also included, which is installed inside the air outlet. The guide plate is configured as a conical plate, with the smaller diameter end of the guide plate facing the inside of the feed hopper.

[0019] By adopting the above technical solution, the conical design of the guide plate can effectively guide the gas flow, making the gas more evenly distributed in different mixing chambers inside the feed hopper, thereby improving the mixing effect of the material. The smaller diameter end of the guide plate is installed facing the inside of the feed hopper, which can prevent material from accumulating at the air outlet, reduce the risk of blockage, further ensure smooth material flow, and improve the stability and reliability of the entire system.

[0020] In one specific implementation, a snap-fit ​​groove is provided at the upper end of the feed hopper, the end of the support frame opposite to the mixing motor is snapped into the snap-fit ​​groove, a limit block is installed on the inner side wall of the feed hopper, and an insertion groove is provided on the mixing partition, the limit block can be inserted into the insertion groove.

[0021] By adopting the above technical solution, the support frame of the mixing device can be easily snapped into the snap-fit ​​groove of the feed hopper, ensuring the stable installation of the mixing device. Simultaneously, the design of the limiting block and the insertion groove allows the mixing baffle to be accurately positioned within the feed hopper, avoiding uneven mixing or material blockage caused by positional misalignment. The locking groove further enhances the stability of the mixing baffle, preventing loosening during the mixing process, ensuring the continuity and efficiency of the mixing process, and facilitating the removal of the mixing device from the feed hopper for easy maintenance.

[0022] In one specific implementation scheme, a plurality of limiting blocks are provided, and the plurality of limiting blocks are distributedly installed on the circumferential part of the inner side wall of the feed hopper, and a plurality of insertion slots are provided on the mixing partition corresponding to the limiting blocks.

[0023] By adopting the above technical solution, multiple limiting blocks are distributed and installed circumferentially on the inner side wall of the feed hopper, and several insertion slots are correspondingly opened on the mixing baffle, which effectively improves the installation stability and reliability of the mixing baffle, avoids the mixing baffle from loosening or falling off due to material impact during the mixing process, ensures the continuity and stability of the mixing process, and thus improves the quality of the final product and production efficiency.

[0024] In one specific implementation, the drive assembly includes two high-torque motors mounted on the frame, a gearbox mounted on the frame, the output shaft of the high-torque motors connected to the input end of the gearbox, and a first screw and a second screw connected to the output end of the gearbox, with the first screw and the second screw rotating in the same direction.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. The mixing motor and mixing rollers ensure that the material is pre-mixed before entering the barrel, improving the mixing uniformity and preventing product quality degradation due to uneven mixing. The mixing blades further enhance the mixing effect, ensuring that the material is well-mixed before entering the twin-screw extruder, reducing the risk of material sticking and clogging the feed hopper, and improving production efficiency and product quality.

[0027] 2. The mixing motor and mixing roller in the mixing device effectively agitate the materials, ensuring thorough mixing before they enter the hopper. The design of the mixing baffles allows materials to mix gradually in different mixing chambers, further improving the mixing effect. The inclined design and varying thickness of the pusher blocks help propel the materials downwards, preventing material accumulation. Multiple sets of mixing blades further enhance the mixing effect. The introduction of air inlets and ventilation pipes, combined with the design of air outlets, allows for the uniform injection of gas into the mixing chambers, helping to loosen the materials, reduce adhesion, and improve material flowability, thereby preventing clogging of the feed hopper and improving the quality of the finished product. The conical design of the guide plate facilitates the smooth entry of materials into the next mixing chamber, ensuring uniform material distribution. Simultaneously, hot air can be blown into the feed hopper via devices such as hot air blowers, further ensuring the dryness of the materials.

[0028] 3. The support frame of the mixing device can be easily snapped into the snap-fit ​​groove of the feed hopper, ensuring stable installation of the mixing device. Meanwhile, the design of the limiting block and the insertion groove allows the mixing baffle to be accurately positioned within the feed hopper, avoiding uneven mixing or material blockage caused by positional misalignment. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of an embodiment of this application.

[0030] Figure 2 This is a structural diagram illustrating the connection between the feed hopper and the mixing device.

[0031] Figure 3 A cross-sectional view showing the connection between the feed hopper and the mixing device.

[0032] Figure 4 This is a schematic diagram of the feed hopper.

[0033] Figure 5 This is a schematic diagram of the mixing device.

[0034] Explanation of reference numerals in the attached drawings: 1. Frame; 2. Barrel; 3. First screw; 4. Second screw; 5. Drive unit; 6. Gearbox; 7. Feed hopper; 71. Air inlet; 72. Air vent; 73. Air outlet; 74. Clip groove; 75. Limit block; 8. Mixing device; 81. Mixing motor; 82. Mixing roller; 83. Mixing partition; 831. Material passage; 84. Mixing blade; 85. Push block; 9. Support frame; 91. Support rod; 10. Guide plate. Detailed Implementation

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "set" and "connection" 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 direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0036] This application discloses a high-torque co-rotating parallel twin-screw extruder.

[0037] like Figure 1 As shown, the high-torque co-rotating parallel twin-screw extruder includes a frame 1, a barrel 2, a first screw 3, a second screw 4, a drive unit 5, and a gearbox 6. The barrel 2 is mounted on the frame 1. The drive motor includes two high-torque motors. The torque range of the high-torque motors used in the daily production of medium-sized twin-screw extruders is typically between 500 N·m and 2000 N·m, while the torque range of the high-torque motors used in the daily production of large twin-screw extruders is typically between 2000 N·m and 10000 N·m. The two high-torque motors are mounted side by side on the frame 1. The gearbox 6 is installed between the barrel 2 and the high-torque motors. The output shaft of the high-torque motor is connected to the input end of the gearbox 6. One end of the first screw 3 and the second screw 4 is connected to the output end of the gearbox 6, thereby realizing the co-rotating drive of the first screw 3 and the second screw 4. A feed hopper 7 is installed on the barrel 2, and a mixing device 8 is installed inside the feed hopper 7.

[0038] like Figures 2-4 As shown, the mixing device 8 includes a mixing motor 81, a mixing roller 82, and a mixing partition 83. The mixing motor 81 can be an AC motor or a DC motor, both of which can drive the mixing roller 82 to rotate, thus achieving material mixing. The mixing roller 82 can be made of stainless steel or aluminum alloy, both of which have good corrosion resistance and strength, making them suitable for high-temperature and high-pressure working environments. The length of the mixing roller 82 can be adjusted according to actual needs. For example, for a longer feed hopper 7, a longer mixing roller 82 can be selected to ensure that the material in the entire feed hopper 7 is fully mixed.

[0039] In this embodiment, a support frame 9 is also included. The support frame 9 includes several support rods 91 and a support plate. The support rods 91 are installed on the circumferential part of the support plate. Several snap-fit ​​grooves 74 are opened on the circumferential part of the upper end of the feed hopper 7. The end of the support rod 91 away from the support plate can be snapped into the snap-fit ​​groove 74 and can slide in the snap-fit ​​groove 74. The drive motor is installed on the support plate, and the output shaft of the drive motor extends into the feed hopper 7 through the side wall of the support plate. The mixing roller 82 is fixedly connected to the output shaft of the drive motor. Three mixing partitions 83 are provided. The mixing partitions 83 are installed on the mixing roller 82. The three mixing partitions 83 are installed sequentially along the length direction of the mixing roller 82 and are installed sequentially at different heights of the feed hopper 7. The dimensions of the three mixing partitions 83 are set to correspond to the inner diameter of the feed hopper 7 at different heights. Two mixing chambers are formed between adjacent mixing partitions 83.

[0040] Several limiting blocks 75 are installed on the mixing baffles 83 at different heights on the inner side wall of the feed hopper 7. Each group of limiting blocks 75 has several blocks, and the limiting blocks 75 are evenly installed on the circumferential part of the inner side wall of the feed hopper 7. The mixing baffles 83 have insertion slots corresponding to the limiting blocks 75. The limiting blocks 75 can be inserted into the insertion slots, thereby limiting the mixing baffles 83 and preventing the mixing baffles 83 from shifting during use.

[0041] Three sets of stirring blades 84 are installed on the mixing roller 82, located above three sets of mixing baffles 83. Each set of stirring blades 84 has several blades, which are distributed around the circumference of the mixing roller 82. The stirring blades 84 can adopt different shapes and sizes, such as spiral, blade, or rake shapes. These shapes of stirring blades 84 can effectively push the material along the direction of the mixing roller, preventing material from accumulating in the feed hopper 7. The thickness of the stirring blades 84 can gradually decrease from bottom to top, which reduces the resistance of the stirring blades 84 during rotation and improves the mixing efficiency. The surface of the stirring blades 84 can be coated with an anti-stick coating, such as a Teflon coating, to prevent material from adhering to its surface. The number and position of the stirring blades 84 can be adjusted according to actual needs. For example, for materials with poor flowability, the number of stirring blades 84 can be appropriately increased to enhance the mixing effect. The stirring blades 84 can be installed in different mixing chambers to ensure that the material in each mixing chamber is fully mixed. The installation position of the mixing blade 84 can be adjusted according to the shape and size of the mixing chamber to ensure a tighter fit with the mixing rod.

[0042] The mixing partition 83 has material passage holes 831. These holes 831 are staggered at different heights on the mixing partitions 83. Several sets of pusher blocks 85 are installed on the mixing rod corresponding to different mixing partitions 83. These pusher blocks 85 are slidably connected to the upper surfaces of the different mixing partitions 83. The number of material passage holes 831 can be multiple, evenly distributed around the circumference of the mixing partition 83, ensuring uniform material distribution between different mixing chambers. The diameter of the material passage holes 831 can be adjusted according to the particle size of the material to prevent blockage. The staggered arrangement of the material passage holes 831 at different heights on the mixing partition 83 creates a complex material flow path, further improving the mixing effect. The pusher blocks 85 can be made of wear-resistant materials, such as high-molecular-weight polyethylene or nylon. These materials have a low coefficient of friction and high wear resistance, allowing for long-term use without damage. The thickness of the pusher block 85 can gradually decrease from bottom to top, which can reduce the resistance of the pusher block 85 during movement and improve the pushing efficiency. The pusher block 85 is inclined on the side wall corresponding to the rotation of the output shaft of the mixing motor 81, so that the inclined surface of the pusher block 85 can guide the material to move upward and avoid the material from accumulating on the mixing partition 83.

[0043] An air inlet 71 is installed on the outer wall of the feed hopper 7, and a venting pipe 72 is provided inside the side wall of the feed hopper 7. Several air outlets 73 are provided on the side walls of different mixing chambers inside the feed hopper 7, evenly distributed around the circumference of the inner side wall of the feed hopper 7. The air outlets 73 are connected to the venting pipe 72. The air inlet 71 can be a quick-connect coupling, which facilitates connection to a gas source and ensures a stable gas supply. The air inlet 71 can be installed at any position on the feed hopper 7, such as the top or side, allowing for flexible selection of the air inlet location. The diameter of the air inlet 71 can be adjusted according to actual needs to ensure a stable gas flow rate. The venting pipe 72 can be made of stainless steel or copper, as these materials have good corrosion resistance and high strength, suitable for high-temperature and high-pressure working environments. The venting pipe 72 can be embedded inside the side wall of the feed hopper 7 to ensure that it does not affect the normal use of the feed hopper 7. A valve can be installed on the vent pipe 72 to control the gas flow. Several vent holes 73 can be provided, evenly distributed around the inner wall of the feed hopper 7 to ensure uniform gas distribution in different mixing chambers. The diameter of the vent holes 73 can be adjusted according to actual needs to ensure stable gas flow. The vent holes 73 can be tapered, with the smaller end facing inwards towards the feed hopper 7, reducing resistance during gas flow and improving diffusion. A guide plate 10 can also be installed on the inner wall of the feed hopper 7. The guide plate 10 is tapered, with the smaller diameter end facing inwards towards the feed hopper 7, guiding material flow better within the feed hopper 7 and preventing material accumulation.

[0044] The implementation principle of a high-torque co-rotating parallel twin-screw extruder according to this application embodiment is as follows: By installing a mixing device 8 in the feed hopper 7, the problems of uneven mixing and clogging of materials during the feeding process can be effectively solved. The mixing motor 81 drives the mixing rod to rotate, causing the material to continuously tumble in the feed hopper 7, promoting uniform mixing of the material. The design of the stirring blades 84 can effectively push the material along the direction of the mixing rod, avoiding material accumulation in the feed hopper 7. The use of the mixing device 8 not only improves the mixing effect of the material, but also reduces the clogging phenomenon, thereby improving production efficiency and product quality.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-torque co-rotating parallel twin-screw extruder comprising a frame (1) on which a barrel (2) is mounted, a first screw (3) and a second screw (4) are mounted in the barrel (2), a drive assembly for driving the first screw (3) and the second screw (4) to rotate in the same direction is mounted on the frame (1), and a feeding hopper (7) is mounted on the barrel (2), characterized in that: The feeding hopper (7) is provided with a mixing device (8) inside, the mixing device (8) comprises a mixing motor (81), a mixing roller (82) and a mixing partition plate (83), a support frame (9) is arranged at the opening of the upper end of the feeding hopper (7), the mixing motor (81) is installed on the support frame (9), the mixing roller (82) is fixedly connected with the output shaft of the mixing motor (81) and is arranged along the height direction of the feeding hopper (7), the mixing roller (82) is provided with stirring blades (84), at least two mixing partition plates (83) are arranged, the mixing partition plates (83) are arranged along the height direction of the feeding hopper (7), the sizes of the mixing partition plates (83) correspond to the inner diameters of different height parts of the feeding hopper (7), different mixing chambers are formed between adjacent mixing partition plates (83), and material holes (831) are formed in the mixing partition plates (83). ​ 2. The high torque co-rotating, parallel twin screw extruder of claim 1, wherein: The outer side wall of the feeding hopper (7) is provided with an air inlet nozzle (71), the inner wall of the side wall of the feeding hopper (7) is provided with an air passage (72), a plurality of air outlet holes (73) are formed in the inner side wall of different mixing chambers in the feeding hopper (7), the air outlet holes (73) are uniformly arranged on the circumferential part of the inner side wall of the feeding hopper (7), the air outlet holes (73) are connected with the air passage (72), a guide plate (10) is arranged on the inner side wall of the feeding hopper (7), the guide plate (10) is arranged in the air outlet hole (73), the guide plate (10) is arranged in a conical shape, and the smaller diameter end of the guide plate (10) is arranged towards the inner side of the feeding hopper (7).

3. The high torque co-rotating parallel twin screw extruder of claim 2, wherein: The material holes (831) on the mixing partition plates (83) at different height parts are arranged alternately, and a plurality of groups of pushing blocks (85) are arranged on the mixing roller (82) corresponding to different mixing partition plates (83), and the pushing blocks (85) are slidably connected to the upper surfaces of different mixing partition plates (83).

4. The high torque co-rotating twin screw extruder of claim 3, wherein: The material holes (831) are arranged in a plurality of groups, and the material holes (831) are uniformly arranged on the circumferential part of the mixing partition plate (83), and the number of pushing blocks (85) in each group corresponds to the number of material holes (831).

5. The high torque co-rotating, twin-screw extruder of claim 2, wherein: The side wall of the pushing block (85) corresponding to the rotating side of the output shaft of the mixing motor (81) is arranged in an inclined manner, and the thickness of the pushing block (85) gradually decreases from bottom to top.

6. The high torque co-rotating, parallel twin screw extruder of claim 1, wherein: The stirring blades (84) are arranged in a plurality of groups, and the stirring blades (84) are arranged in different mixing chambers.

7. The high torque co-rotating twin screw extruder of claim 6, wherein: A clamping groove (74) is formed in the upper end part of the feeding hopper (7), one end of the support frame (9) away from the mixing motor (81) is clamped in the clamping groove (74), a limiting block (75) is arranged on the inner side wall of the feeding hopper (7), and a plug-in groove is formed in the mixing partition plate (83), and the limiting block (75) can be plugged into the plug-in groove. The limiting block (75) is arranged in a plurality of groups, and the limiting blocks (75) are arranged on the circumferential part of the inner side wall of the feeding hopper (7), and a plurality of plug-in grooves are formed in the mixing partition plate (83) corresponding to the limiting blocks (75).

8. The high torque co-rotating, parallel twin screw extruder of claim 1, wherein: The driving assembly comprises two high-torque motors, which are installed on the frame (1), a speed reducer (6) is installed on the frame (1), the output shafts of the high-torque motors are connected with the input end of the speed reducer (6), the first screw rod (3) and the second screw rod (4) are connected with the output end of the speed reducer (6), and the first screw rod (3) and the second screw rod (4) are arranged in the same rotating direction.

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