Double-screw co-rotating mixing extruder for manufacturing starch-based plastic
By employing an adjustable discharge rate device and hydraulic rod control in a twin-screw co-rotating compounding extruder, combined with a specially designed screw, the problem of coarse discharge rate control in traditional extruders has been solved. This achieves uniform mixing and precise discharge of starch-based plastics, improving product quality and material utilization.
Patent Information
- Application Number
- CN202423158661.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-12-20
AI Technical Summary
Traditional extruders use relatively crude methods to control the output, making it difficult to achieve precise adjustments, which leads to product quality fluctuations and low raw material utilization.
It employs an adjustable discharge control device and hydraulic rod, combined with a specially designed co-rotating screw, to achieve precise control of material quantity and uniform mixing.
To ensure uniform material composition, achieve stable product quality and efficient utilization of raw materials, and reduce waste.
Smart Images
Figure CN223618205U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of extruder technology, and more particularly to a twin-screw co-rotating compounding extruder for manufacturing starch-based plastics. Background Technology
[0002] With increasing environmental awareness, the demand for biodegradable materials is growing. Starch-based plastics, as an important biodegradable material, have broad application prospects in packaging, agricultural films, and other fields. Currently, various twin-screw compounding extruders are available on the market for the preparation of starch-based plastics. These devices achieve uniform mixing and plasticization of raw materials through mechanical shearing force and thermal energy.
[0003] Traditional extruders employ relatively crude methods for controlling the output, often making precise adjustments difficult. When producing products of different specifications or adjusting production speeds, operators cannot accurately control the amount of material entering the processing area. This can lead to fluctuations in product quality and low raw material utilization, resulting in unnecessary waste. Therefore, this patent aims to upgrade and modify existing technologies. Utility Model Content
[0004] To address the shortcomings of existing technologies, this application provides a twin-screw co-rotating compounding extruder for manufacturing starch-based plastics. This invention overcomes the deficiencies of existing technologies by addressing the problem that traditional extruders rely on coarse methods for controlling the discharge rate, making precise adjustment difficult. When producing products of different specifications or adjusting production speeds, operators cannot accurately control the amount of material entering the processing area. This can lead to fluctuations in product quality and low raw material utilization, resulting in unnecessary waste.
[0005] To achieve the above objectives, this application provides the following technical solution: a twin-screw co-rotating compounding extruder for manufacturing starch-based plastics, comprising a frame, a feed hopper, and a drive area. The feed hopper is fixedly connected to the top of the frame, and a stirring motor is fixedly connected to the top of the feed hopper. A stirring shaft is fixedly connected to the drive end of the stirring motor, and a stirring rod is fixedly connected to the outer side of the bottom of the stirring shaft. The bottom of the feed hopper is provided with a discharge port, and an adjustable discharge control device is provided inside the discharge port. The discharge control device includes a slider inserted into the discharge port and a hydraulic rod fixedly connected to one side of the slider. The hydraulic rod is fixedly connected to one end of the top of the frame. A heating cylinder is provided inside the frame, and two sets of co-rotating screws with a special structural design are rotatably connected inside the heating cylinder. The drive area is fixedly connected to one end of the frame near the feed hopper.
[0006] By adopting the above technical solution, the starch-based plastic raw materials and additives are fully stirred during the feeding stage to prevent material agglomeration and ensure that the material composition entering the extruder is uniform. The discharge amount is precisely adjusted by controlling the position of the slider in the discharge port through the hydraulic rod, so that the operator can accurately control the amount of material entering the heating cylinder according to production needs, such as different product specifications and production speed.
[0007] As a preferred technical solution of this application, the heating cylinder is divided into a feeding section, a compression section and a homogenization section.
[0008] By adopting the above technical solution, the feeding section is used for preliminary mixing, the compression section is used for material compaction, and the homogenization section is used for further mixing and plasticizing.
[0009] As a preferred technical solution of this application, the frame is equipped with heating elements and is divided into a preheating zone, a melting zone and a homogenization zone, and each zone is equipped with an independent temperature control unit.
[0010] The above technical solution is used to provide precise temperature conditions for materials at different processing stages.
[0011] As a preferred technical solution of this application, the top end of the frame is provided with a feed port, and a support rod is fixedly connected inside the discharge port. The support rod is provided with multiple sets of equidistantly arranged and fixedly connected inside the discharge port, and the slider is slidably connected to the top of the support rod.
[0012] By adopting the above technical solution, the support rod can prevent raw materials that have formed clumps or lumps from falling into the machine frame and affecting the operation of the equipment. At the same time, the support rod can support the slider.
[0013] As a preferred technical solution of this application, the heating cylinder is provided with a feed inlet at one end of the top, the feed inlet and the discharge outlet are positioned corresponding to each other, and the heating cylinder is provided with an extrusion outlet at the end.
[0014] By adopting the above technical solution, it is ensured that the material can smoothly enter the heating cylinder from the feed hopper, and the extrusion port is used to discharge the processed material.
[0015] As a preferred technical solution of this application, a connecting rod is fixedly connected to one end of the screw, one end of the connecting rod passes through the frame and is connected to the inside of the drive area, a rotating thread tooth is fixedly provided on the outside of the connecting rod, a rotating shaft is rotatably connected inside the drive area, a driving thread tooth is provided on the outside of the rotating shaft, the driving thread tooth and the rotating thread tooth are meshed, a drive motor is fixedly connected to the outside of the drive area, and the drive end of the drive motor passes through the inner wall of the drive area and is fixedly connected to the rotating shaft.
[0016] By adopting the above technical solution, the rotating shaft is driven by the drive motor to rotate, which in turn drives the rotating threaded teeth and screw to rotate, thereby realizing the processing of the material inside the heating cylinder. The material is processed and transported from the feed port end of the heating cylinder to the extrusion port end under the rotation of the screw, and then discharged outward through the extrusion port.
[0017] As a preferred technical solution of this application, a sealing gasket is provided between the slider and the inner wall of the discharge port.
[0018] By adopting the above technical solution, material leakage from the gap between the slider and the discharge port can be prevented during the discharge control process.
[0019] As a preferred technical solution of this application, the pitch of the two sets of screws has different gradual change patterns in the feeding section, compression section and homogenization section.
[0020] By adopting the above technical solution, the screw pitch is larger in the feeding section to facilitate material entry, the screw pitch gradually decreases in the compression section, and the screw pitch remains stable and small in the homogenization section, so as to achieve better material compaction and mixing effect.
[0021] The beneficial effects of this application are:
[0022] 1. In this invention, starch-based plastic raw materials and additives can be fully stirred during the feeding stage. Multiple sets of equidistant stirring rods with their ends close to the inner wall of the feed hopper can effectively break up material agglomeration, ensuring that the materials are uniformly mixed before entering the extruder body. The position of the slider in the discharge port can be precisely adjusted by controlling the position of the hydraulic rod. Operators can accurately control the amount of material entering the heating cylinder according to different production needs, ensuring the stability of product quality, improving the utilization rate of raw materials, and reducing waste.
[0023] 2. In this invention, the screw edges and grooves of the two sets of screws cooperate with each other, maintaining a certain staggered fit in the axial direction. This unique design allows the material to undergo more thorough shearing, compression, and mixing during screw rotation. In the manufacturing process of starch-based plastics, it enables various additives and starch matrix to be mixed more evenly, ensuring the stability and reliability of product quality. Attached Figure Description
[0024] Figure 1 This is a frontal sectional view of the structure of this application;
[0025] Figure 2 This is a schematic diagram of the top view structure of this application;
[0026] Figure 3 This is a schematic diagram of the side section structure of the feed hopper in this application;
[0027] Figure 4This is a schematic diagram of the bottom structure of the feed hopper in this application;
[0028] Figure 5 This is a schematic diagram of the heating cylinder in this application;
[0029] Figure 6 This is a schematic cross-sectional view of the heating cylinder in this application;
[0030] Figure 7 This is a schematic diagram of the screw structure in this application.
[0031] In the diagram: 1. Frame; 2. Feed hopper; 3. Drive area; 4. Rotating threaded gear; 5. Rotating shaft; 6. Drive threaded gear; 7. Drive motor; 8. Hydraulic rod; 9. Slider; 10. Agitator motor; 11. Feed inlet; 12. Heating cylinder; 13. Agitator shaft; 14. Agitator rod; 15. Discharge port; 16. Support rod; 17. Screw; 18. Connecting rod; 19. Feed inlet; 20. Extrusion port. Detailed Implementation
[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0033] Reference Figure 1-7A twin-screw co-rotating compounding extruder for manufacturing starch-based plastics includes a frame 1, a feed hopper 2, and a drive zone 3. The feed hopper 2 is fixedly connected to the top of the frame 1. A stirring motor 10 is fixedly connected to the top of the feed hopper 2. A stirring shaft 13 is fixedly connected to the drive end of the stirring motor 10. A stirring rod 14 is fixedly connected to the outer side of the bottom of the stirring shaft 13. The stirring rod 14 has multiple sets equidistantly arranged on the outer side of the stirring shaft 13, and the ends of the stirring rods 14 are close to the inner wall of the feed hopper 2 to fully stir the starch-based plastic raw materials and additives during the feeding stage and prevent material agglomeration. The bottom of the feed hopper 2 has a discharge port 15. The discharge port 15 has an adjustable discharge control device inside. The discharge control device includes a slider 9 inserted into the discharge port 15 and a hydraulic rod 8 fixedly connected to one side of the slider 9. The hydraulic rod 8 is fixedly connected to the top of the frame 1. At the end, the position of the slider 9 can be precisely controlled by the hydraulic rod 8 to achieve precise adjustment of the output amount. The frame 1 is equipped with a heating cylinder 12. Inside the heating cylinder 12, two sets of screws 17 with special structural design and rotating in the same direction are rotatably connected. The screw edges and screw grooves of the two sets of screws 17 cooperate with each other and maintain a certain misaligned fit in the axial direction to achieve efficient mixing and conveying of materials. The drive area 3 is fixedly connected to one end of the frame 1 near the feed hopper 2 to provide rotational power for the screws 17. During the feeding stage, the starch-based plastic raw materials and additives are fully stirred to prevent material agglomeration and ensure that the material composition entering the extruder is uniform. The output amount is precisely adjusted by controlling the position of the slider in the discharge port through the hydraulic rod, so that the operator can accurately control the amount of material entering the heating cylinder according to production needs, such as different product specifications and production speed.
[0034] In this embodiment, as Figure 1 - Figure 7 As shown, the heating cylinder 12 is divided into a feeding section, a compression section and a homogenization section. The feeding section is used for preliminary mixing, the compression section is used for material compaction, and the homogenization section is used for further mixing and plasticizing.
[0035] In this embodiment, as Figure 1 - Figure 7 As shown, the frame 1 is equipped with heating elements and is divided into a preheating zone, a melting zone and a homogenization zone. Each zone is equipped with an independent temperature control unit to provide precise temperature conditions for the material at different processing stages.
[0036] In this embodiment, as Figure 1 - Figure 7As shown, a feed inlet 11 is provided at one end of the top of the frame 1, and a support rod 16 is fixedly connected inside the discharge outlet 15. Multiple sets of support rods 16 are fixedly connected inside the discharge outlet 15 in an equidistant arrangement. The slider 9 is slidably connected to the top of the support rod 16. The support rod 16 can prevent the raw materials that have formed clumps or blocks from falling into the frame 1 and affecting the operation of the equipment. At the same time, the support rod 16 can support the slider 9.
[0037] In this embodiment, as Figure 1 - Figure 7 As shown, a feed inlet 19 is provided at one end of the top of the heating cylinder 12. The feed inlet 19 and the discharge outlet 15 are positioned to ensure that the material can smoothly enter the interior of the heating cylinder 12 from the feed hopper 2. An extrusion outlet 20 is provided at the end of the heating cylinder 12 for discharging the processed material.
[0038] In this embodiment, as Figure 1 - Figure 7 As shown, a connecting rod 18 is fixedly connected to a section of the screw 17. One end of the connecting rod 18 passes through the frame 1 and is connected to the inside of the drive area 3. A rotating threaded tooth 4 is fixedly provided on the outside of the connecting rod 18. A rotating shaft 5 is rotatably connected inside the drive area 3. A driving threaded tooth 6 is provided on the outside of the rotating shaft 5. The driving threaded tooth 6 and the rotating threaded tooth 4 are meshed. A drive motor 7 is fixedly connected to the outside of the drive area 3. The drive end of the drive motor 7 passes through the inner wall of the drive area 3 and is fixedly connected to the rotating shaft 5. The drive motor 7 drives the rotating shaft 5 to rotate, which in turn drives the rotating threaded tooth 4 and the screw 17 to rotate, thereby processing the material inside the heating cylinder 12. The material is processed and transported from the feed port of the heating cylinder 12 to the extrusion port 20 under the rotation of the screw 17, and then discharged outward through the extrusion port 20.
[0039] In this embodiment, as Figure 1 - Figure 7 As shown, a sealing gasket is provided between the slider 9 and the inner wall of the discharge port 15 to prevent material from leaking from the gap between the slider 9 and the discharge port 15 during the discharge control process.
[0040] In this embodiment, as Figure 1 - Figure 7 As shown, the pitch of the two sets of screws 17 has different gradual change patterns in the feeding section, compression section and homogenization section. The pitch is larger in the feeding section to facilitate material entry, the pitch gradually decreases in the compression section, and the pitch remains stable and smaller in the homogenization section to achieve better material compaction and mixing effect.
[0041] Working Principle: The stirring motor 10 is started, causing the stirring rod 14 to rotate within the feed hopper 2. Starch-based plastic raw materials and additives are added from the top of the feed hopper 2 according to a predetermined ratio and formula. The stirring rod 14 thoroughly mixes the materials, preventing agglomeration and ensuring uniform mixing. During the mixing process, the speed of the stirring motor 10 can be adjusted appropriately via the control system based on the material characteristics and mixing effect. According to production needs, the position of the slider 9 within the discharge port 15 is adjusted by operating the hydraulic rod 8 via the control system, thereby precisely controlling the discharge rate. A flow sensor can be installed at the discharge port 15 to monitor the discharge rate in real time. After the material flows out of the discharge port 15, it enters the heating cylinder 12 through the feed inlet 11. When the temperature of each zone of the heating cylinder 12 reaches the preset value and the material has entered the heating cylinder 12, the drive motor 7 is started. The drive motor 7 drives the rotating shaft 5 to rotate. The rotating shaft 5 is driven by the meshing of the drive threaded teeth 6 and the rotating threaded teeth 4, causing the screw 17 to rotate in the same direction inside the heating cylinder 12. Under the action of the screw 17, the material moves axially inside the heating cylinder 12. In the feeding section, the material is initially mixed. As the material moves towards the compression section, due to the change in the screw pitch of the screw 17, the material is subjected to gradually increasing pressure, achieving material compaction. In the homogenization section, the special structure of the screw 17 further mixes and plasticizes the material. Throughout the process, the heating elements in each zone of the heating cylinder 12 maintain a suitable temperature according to the control of the temperature control unit, ensuring the processing quality of the material at different stages. Driven by the rotation of the screw 17, the material is processed and transported from one end of the feeding port of the heating cylinder 12 to one end of the extrusion port 20, and discharged outward through the extrusion port 20, completing the extrusion processing of starch-based plastics.
[0042] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A twin-screw co-rotating compounding extruder for manufacturing starch-based plastics, comprising a frame (1), a feed hopper (2), and a drive zone (3), characterized in that, The feed hopper (2) is fixedly connected to the top of the frame (1). A stirring motor (10) is fixedly connected to the top of the feed hopper (2). A stirring shaft (13) is fixedly connected to the driving end of the stirring motor (10). A stirring rod (14) is fixedly connected to the outer side of the bottom of the stirring shaft (13). A discharge port (15) is provided at the bottom of the feed hopper (2). An adjustable discharge control device is provided inside the discharge port (15). The discharge control device includes a slider (9) inserted into the discharge port (15) and a hydraulic rod (8) fixedly connected to one side of the slider (9). The hydraulic rod (8) is fixedly connected to one end of the top of the frame (1). A heating cylinder (12) is provided inside the frame (1). Two sets of screws (17) with special structural design and rotating in the same direction are rotatably connected inside the heating cylinder (12). The driving area (3) is fixedly connected to one end of the frame (1) near the feed hopper (2) to provide rotational power for the screws (17).
2. The twin-screw co-rotating compounding extruder for manufacturing starch-based plastics according to claim 1, characterized in that, The heating cylinder (12) is divided into a feeding section, a compression section and a homogenization section.
3. The twin-screw co-rotating compounding extruder for manufacturing starch-based plastics according to claim 1, characterized in that, The frame (1) is equipped with heating elements and is divided into a preheating zone, a melting zone and a homogenization zone, each zone having an independent temperature control unit.
4. A twin-screw co-rotating compounding extruder for manufacturing starch-based plastics according to claim 1, characterized in that, The top end of the frame (1) is provided with a feed inlet (11), and a support rod (16) is fixedly connected inside the discharge port (15). The support rod (16) is provided with multiple sets of fixed connections inside the discharge port (15) arranged at equal intervals. The slider (9) is slidably connected to the top of the support rod (16).
5. A twin-screw co-rotating compounding extruder for manufacturing starch-based plastics according to claim 1, characterized in that, The heating cylinder (12) has a feed inlet (19) at one end of its top, and the feed inlet (19) and the discharge outlet (15) are positioned to correspond to each other. The heating cylinder (12) has an extrusion outlet (20) at its end.
6. A twin-screw co-rotating compounding extruder for manufacturing starch-based plastics according to claim 1, characterized in that, A connecting rod (18) is fixedly connected to one end of the screw (17). One end of the connecting rod (18) passes through the frame (1) and is connected to the inside of the drive area (3). A rotating thread tooth (4) is fixedly provided on the outside of the connecting rod (18). A rotating shaft (5) is rotatably connected inside the drive area (3). A driving thread tooth (6) is provided on the outside of the rotating shaft (5). The driving thread tooth (6) and the rotating thread tooth (4) are meshed. A drive motor (7) is fixedly connected to the outside of the drive area (3). The driving end of the drive motor (7) passes through the inner wall of the drive area (3) and is fixedly connected to the rotating shaft (5).
7. A twin-screw co-rotating compounding extruder for manufacturing starch-based plastics according to claim 1, characterized in that, A sealing gasket is provided between the slider (9) and the inner wall of the discharge port (15).
8. A twin-screw co-rotating compounding extruder for manufacturing starch-based plastics according to claim 1, characterized in that, The pitch of the two sets of screws (17) has different gradual change patterns in the feeding section, compression section and homogenization section.