Precise homogenizing tank system for waste plastic regenerated particles

Abstract

The invention belongs to the technical field of plastic processing, and particularly relates to a waste plastic regenerated particle precise homogenizing tank system which comprises a tank body with a main feeding port and a discharging port, a support used for supporting the tank body and a homogenizing mechanism arranged on the tank body. The rotating directions of the central main spiral stirring rod and the two annular wall convection spiral stirring rods are opposite, and the central main spiral stirring rod and the two annular wall convection spiral stirring rods are used for performing three-dimensional mixing on plastic particles. According to the precise homogenizing tank system for the waste plastic regenerated particles, the homogenizing mechanism is arranged, and a driving gear is meshed with two driven gears, so that plastic particles in the tank body are mixed by a central main spiral stirring rod and two annular wall convection spiral stirring rods which are opposite in rotating direction; and a driven gear is matched to annularly move along the inner wall of the inner gear ring, so that a high-strength and dead-corner-free three-dimensional mixed flow field is constructed, and high-precision and high-efficiency homogenization of waste plastic particles in the aspects of color, component and density is realized.

Description

Technical Field

[0001] This invention relates to the field of plastic processing technology, and in particular to a precision homogenization tank system for recycled plastic pellets. Background Technology

[0002] After waste plastics are crushed, washed, melted, and granulated, the resulting recycled granules often exhibit batch-to-batch variations in color, composition, melt flow index, density, and trace moisture content. Direct use in downstream product manufacturing can lead to uneven product color, performance fluctuations, and increased defect rates. Therefore, high-precision homogenization of recycled granules before molding is a crucial step in improving the quality and value of recycled plastics.

[0003] Currently, the processing of non-metallic waste, especially the homogenization of plastic granules, in the industry mainly relies on traditional double-cone mixers, three-dimensional motion mixers, or simple vertical mixing tanks. Traditional mixing methods mainly rely on gravity diffusion and limited mechanical tumbling. For recycled plastic granules with large differences in density, shape, and surface properties, it is difficult to achieve sufficient and uniform mixing at the microscale, and dead zones are easily formed. At the same time, the mixing process is invisible, and there is a lack of online real-time monitoring methods for mixing uniformity. Traditional equipment only has basic mixing functions and cannot simultaneously perform effective drying, temperature uniformity control, or inert gas protection during the mixing process. These conditions are crucial to the quality of certain sensitive materials (such as those that are easily oxidized or contain residual moisture).

[0004] Therefore, this application proposes a precision homogenization tank system for recycled plastic pellets. Summary of the Invention

[0005] Based on the aforementioned technical problems, this invention proposes a precision homogenization tank system for recycled waste plastic granules.

[0006] The present invention proposes a precision homogenization tank system for recycled plastic pellets, comprising a tank body having a main feed inlet and a discharge outlet, a support for supporting the tank body, and a homogenization mechanism, an airflow mechanism, and an intelligent sensing and control unit disposed on the tank body, wherein the intelligent sensing and control unit is signal connected to the homogenization mechanism and the airflow mechanism.

[0007] The homogenization mechanism includes a central main spiral stirring rod and two annular convection spiral stirring rods. The central main spiral stirring rod and the two annular convection spiral stirring rods rotate in opposite directions to perform three-dimensional mixing of plastic particles.

[0008] The airflow mechanism includes a microporous distribution disk disposed on the inner wall of the tank and air nozzles arranged in a ring array for introducing gas medium into the tank.

[0009] The intelligent sensing and control unit includes a central controller, a hyperspectral camera, a microwave moisture meter, a near-infrared component analysis probe, and a capacitance tomography sensor installed on the inner wall of the tank. The central controller is used to receive data from the hyperspectral camera, the microwave moisture meter, the near-infrared component analysis probe, and the capacitance tomography sensor, and dynamically adjust the operating parameters of the homogenization mechanism and the airflow mechanism based on a preset digital twin model and an adaptive fuzzy-PID control algorithm.

[0010] Preferably, the homogenization mechanism further includes a stirring motor fixedly installed on the top of the tank. One end of the output shaft of the stirring motor extends into the tank and is fitted with a planetary carrier through a bearing. The lower surface of the planetary carrier is fitted with a driving gear and two driven gears through bearings. The driving gear meshes with the two driven gears. The output shaft of the stirring motor is fixedly connected to the axis of the driving gear.

[0011] Through the above technical solution, the stirring motor, as a single power source, directly drives the driving gear to rotate through the output shaft. While the driving gear is rotating, it transmits power synchronously to the two driven gears through its meshing relationship with the two driven gears, causing them to revolve around the driving gear. This planetary gear transmission structure realizes the power distribution of driving the three stirring rods in the center and the ring wall simultaneously with one motor. The structure is compact, the transmission synchronization is good, and the coordination of the stirring motion is ensured.

[0012] Preferably, the upper end of the central main spiral stirring rod is fixedly sleeved at the axis of the driving gear, and the upper ends of the two annular convection spiral stirring rods are respectively fixedly sleeved at the axes of the two driven gears.

[0013] Through the above technical solution, the rotation of the driving gear is directly converted into the fixed-axis rotation of the central main spiral stirring rod, forming a strong central axial flow. At the same time, the rotation of the two driven gears is converted into the fixed-axis rotation of the two annular wall convection spiral stirring rods. The mechanical linkage of the three stirring rods ensures that their rotation directions are strictly opposite. Thus, on the basis of the flow field of center lifting and wall lifting in the tank, strong shearing and convection are superimposed to form a highly efficient three-dimensional mixing flow field, which greatly improves the homogenization accuracy and efficiency of plastic particles of different compositions and colors.

[0014] Preferably, an internal gear ring is fixedly installed on the inner wall of the tank, and both driven gears mesh with the internal gear ring.

[0015] Through the above technical solution, while the driven gear revolves around the driving gear, the teeth of the driven gear also mesh with the fixed internal gear ring. This meshing relationship forces the driven gear to rotate on its own axis while revolving. The rotational motion and the revolving motion are superimposed, so that the annular convection spiral stirring rod not only rotates planetarily around the central axis of the tank, but also rotates continuously on its own. This greatly expands the contact and stirring range of plastic particles at the edge and bottom of the tank, completely eliminates the mixing dead zone, and allows plastic particles at any position in the tank to be fully drawn into the mainstream field, further ensuring the uniformity of homogenization throughout the entire area.

[0016] Preferably, the airflow mechanism further includes a retaining ring fixedly installed on the outer surface of the tank body. An external toothed ring is slidably engaged on the inner wall of the retaining ring. The microporous distribution disk is fixedly connected to the inner wall of the external toothed ring. A drive gear meshes with the surface of the external toothed ring. The drive gear is mounted on the surface of the bracket via a bearing. A drive motor is fixedly installed on the upper surface of the bracket. The output shaft of the drive motor is fixedly sleeved with the axis of the drive gear.

[0017] Through the above technical solution, the drive motor drives the external gear ring to rotate inside the retaining ring via the drive gear, thereby driving the integrated microporous distribution disk to rotate inside the tank. This ensures that the microporous distribution disk can only rotate one revolution in both directions. This rotational motion causes the inert gas ejected from the conical holes of the distribution disk to no longer be static, but to form a dynamic sweeping air curtain. The dynamic air curtain can act more evenly on all materials at the bottom, achieving a gentler and more comprehensive gas-assisted fluidization, reducing the particle friction coefficient, and assisting mixing. At the same time, the rotation also helps to prevent plastic particles from being locally deposited on the surface of the microporous distribution disk.

[0018] Preferably, telescopic cylinders are installed in a ring array on the outer surface of the retaining ring. One end of the piston rod of the telescopic cylinder passes through the retaining ring and extends into the tank body and is fixedly connected to an arc-shaped push plate. The surface of the arc-shaped push plate is slidably connected to the upper surface of the microporous distribution disk. The surface of the microporous distribution disk has a conical hole. The large-diameter end of the conical hole faces the inside of the tank body, and the small-diameter end of the conical hole faces the bottom of the tank body.

[0019] With the above technical solution, when plastic particles slightly accumulate on the microporous distribution plate, the intelligent sensing and control unit can instruct one or more telescopic cylinders to move. The extension of the piston rod of the telescopic cylinder pushes the arc-shaped push plate to move along the surface of the microporous distribution plate, gently pushing the plastic particles in the area in front of the push plate towards the conical hole, causing the plastic particles to fall under gravity. This combination of mechanical cleaning and airflow assistance actively prevents and solves the problem of poor material discharge, ensuring the stability and reliability of the system in long-term operation.

[0020] Preferably, a receiving hopper is provided below the discharge port, a pump body and a storage device are installed on the top of the tank, the suction end of the pump body is connected to the storage device through a pipe, the storage device is connected to the receiving hopper through a suction pipe, and an auxiliary inlet with a discharge valve is installed at the bottom of the storage device.

[0021] Through the above technical solution, when the intelligent sensing and control unit determines that the homogenization degree of the current batch of materials does not meet the standard, the pump starts and pumps the plastic particles in the receiving bucket back to the top of the tank through the storage device. They are then reintroduced into the homogenization process through the auxiliary feed port. The storage device acts as a buffer, avoiding wear or blockage that may be caused by the plastic particles directly entering the pump. This loop realizes the automatic and closed-loop recycling and reprocessing of unqualified materials without manual intervention, which significantly improves the raw material utilization rate and the first-pass yield of finished products, demonstrating the intelligent closed-loop control capability of the system.

[0022] Preferably, an installation ring is fixedly installed on the surface of the tank, and a plurality of air nozzles are arranged in a ring array and installed on the surface of the installation ring extending into the tank. An air guide pipe is fixedly connected to the outer surface of the installation ring, and one end of the air guide pipe is connected to a hot air blower.

[0023] Through the above technical solution, the annular array of air nozzles forms a ring-shaped hot air curtain at the top of the tank. The dry hot air provided by the hot air blower is evenly distributed to each nozzle through the air guide pipe. This hot air curtain has multiple functions: first, it assists in drying the rising material and removes residual moisture; second, it provides a certain degree of thermal compensation, reducing the temperature gradient inside the tank; and third, it creates lateral airflow interference during the stirring process, breaking the possible regular flow pattern and increasing the probability of random collisions of materials, thereby enhancing the mixing effect.

[0024] Preferably, a gas supply pipe is fixedly connected to the lower surface of the microporous distribution plate, a three-way valve is provided on the surface of the gas supply pipe extending out of the tank body, a branch pipe is connected to the surface of the gas guide pipe, the branch pipe is connected to the gas supply pipe through the three-way valve, a suction pump is provided on the surface of the branch pipe, and an inert gas pipeline is connected to the third end of the three-way valve.

[0025] Through the above technical solution, the intelligent switching of the three-way valve can diversify the functions of the airflow mechanism at the bottom of the tank. During the homogenization stage, dry hot air from the branch pipe can be switched in to perform bottom air-assisted fluidization. Before the process starts or when storing sensitive materials, inert gas can be switched in to replace the space inside the tank, forming a protective atmosphere to prevent material oxidation and improve the functionality and safety of the equipment.

[0026] Preferably, the intelligent sensing and control unit further includes a touch screen connected to the central controller for displaying real-time images of the material mixing state simulated by the digital twin model and various process parameters.

[0027] Through the above technical solution, the touch screen serves as a human-machine interface, integrating the multi-sensor data processed by the central controller with the calculation results of the digital twin model. It displays the mixing state, temperature field, and homogenization process of the materials in the tank in real time with visual graphics. Operators can intuitively monitor the process and conveniently set parameters, call recipes, or control start and stop, making the complex precision homogenization process intuitive and controllable.

[0028] The beneficial effects of this invention are as follows:

[0029] 1. By setting up a homogenization mechanism, the meshing of the driving gear and two driven gears causes the central main spiral stirring rod with opposite rotation direction and the two annular wall convection spiral stirring rods to mix the plastic particles inside the tank. In conjunction with the circular motion of the driven gear along the inner wall of the inner tooth ring, a high-intensity, dead-angle-free three-dimensional mixing flow field is constructed, realizing high-precision and high-efficiency homogenization of waste plastic particles in terms of color, composition and density.

[0030] 2. By setting up an airflow mechanism that integrates a rotatable microporous distribution disk, annular air nozzles, and a multi-functional integrated air path, multiple airflow functions such as dynamic air-assisted fluidization, auxiliary drying, and inertial protection are realized. In addition, a mechanical arc-shaped pusher plate cleaning method is used to significantly improve the mixing uniformity, process adaptability, and equipment operation reliability.

[0031] 3. By setting up intelligent sensing and control units, real-time monitoring, closed-loop optimization and intelligent decision-making of the homogenization process are realized, which greatly improves the consistency and stability of plastic granule quality, reduces energy consumption and scrap rate, and realizes the intelligentization and automation of the production process. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a precision homogenization tank system for recycled plastic pellets proposed in this invention.

[0033] Figure 2 This is a three-dimensional view of the tank structure of a precision homogenization tank system for recycled plastic granules proposed in this invention.

[0034] Figure 3 This is a three-dimensional view of the drive gear structure of a precision homogenization tank system for recycled plastic granules proposed in this invention.

[0035] Figure 4 This is a three-dimensional view of the drive gear structure of a precision homogenization tank system for recycled plastic granules proposed in this invention.

[0036] Figure 5 This is a three-dimensional view of the central main spiral stirring rod structure of a precision homogenization tank system for recycled plastic granules proposed in this invention.

[0037] Figure 6 This is a three-dimensional view of the microporous distribution disk structure of a precision homogenization tank system for recycled plastic granules proposed in this invention.

[0038] Figure 7 This is a three-dimensional view of the external toothed ring structure of a precision homogenization tank system for recycled plastic granules proposed in this invention.

[0039] Figure 8 This is a block diagram of the intelligent sensing and control unit of a precision homogenization tank system for recycled plastic granules proposed in this invention.

[0040] In the diagram: 1. Tank body; 2. Support frame; 3. Central main spiral stirring rod; 31. Annular wall convection spiral stirring rod; 32. Stirring motor; 33. Planetary carrier; 34. Driving gear; 35. Driven gear; 36. Internal gear ring; 4. Microporous distribution plate; 41. Air nozzle; 42. Retaining ring; 43. External gear ring; 44. Drive gear; 45. Drive motor; 46. Telescopic cylinder; 47. Arc-shaped push plate; 48. Conical hole; 49. Collection bucket; 410. Pump body; 411. Storage container; 412. Suction pipe; 413. Auxiliary feed port; 414. Mounting ring; 415. Air guide pipe; 416. Hot air blower; 417. Air supply pipe; 418. Three-way valve; 419. Branch pipe; 420. Suction pump; 421. Inert gas pipeline. Detailed Implementation

[0041] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0042] Reference Figures 1-8 A precision homogenization tank system for recycled waste plastic pellets includes a tank body 1 with a main feed inlet and a discharge outlet, a support 2 for supporting the tank body 1, and a homogenization mechanism, an airflow mechanism, and an intelligent sensing and control unit disposed on the tank body 1. The intelligent sensing and control unit is signal-connected to the homogenization mechanism and the airflow mechanism.

[0043] The intelligent sensing and control unit includes a central controller, a hyperspectral camera, a microwave moisture meter, a near-infrared component analysis probe, and a capacitance tomography sensor installed on the inner wall of tank 1. The central controller is used to receive data from the hyperspectral camera, microwave moisture meter, near-infrared component analysis probe, and capacitance tomography sensor and dynamically adjust the operating parameters of the homogenization mechanism and airflow mechanism based on a preset digital twin model and an adaptive fuzzy-PID control algorithm.

[0044] To facilitate observation of the internal conditions of tank 1, the intelligent sensing and control unit also includes a touch screen connected to the central controller. This touch screen displays real-time images of the material mixing state simulated by the digital twin model, as well as various process parameters. As a human-machine interface, the touch screen integrates the multi-sensor data processed by the central controller with the calculation results of the digital twin model, and displays the mixing state, temperature field, and homogenization process of the material inside tank 1 in real-time with visual graphics. Operators can intuitively monitor the process and conveniently set parameters, call recipes, or control start and stop, making the complex precision homogenization process intuitive and controllable.

[0045] By setting up intelligent sensing and control units, real-time monitoring, closed-loop optimization, and intelligent decision-making of the homogenization process were achieved, which greatly improved the consistency and stability of plastic pellet quality, reduced energy consumption and scrap rate, and realized the intelligentization and automation of the production process.

[0046] The homogenization mechanism includes a central main spiral stirring rod 3 and two annular wall convection spiral stirring rods 31. The central main spiral stirring rod 3 and the two annular wall convection spiral stirring rods 31 rotate in opposite directions to perform three-dimensional mixing of plastic particles.

[0047] To mix the plastic granules entering the tank 1, the homogenization mechanism also includes a stirring motor 32 fixedly mounted on the top of the tank 1. One end of the output shaft of the stirring motor 32 extends into the tank 1 and is fitted with a planetary carrier 33 via bearings. A driving gear 34 and two driven gears 35 are respectively mounted on the lower surface of the planetary carrier 33 via bearings. The driving gear 34 meshes with the two driven gears 35. The output shaft of the stirring motor 32 is fixedly sleeved at the axis of the driving gear 34. The upper end of the central main spiral stirring rod 3 is fixedly sleeved at the axis of the driving gear 34. The upper ends of the two annular convection spiral stirring rods 31 are respectively fixedly sleeved at the axes of the two driven gears 35. The stirring motor 32, as a single power source, directly drives the driving gear 34 to rotate via its output shaft. While rotating, the driving gear 34 meshes with the two driven gears 35. The planetary gear transmission structure transmits power synchronously to the two driven gears 35, causing them to revolve around the driving gear 34. This structure enables the simultaneous power distribution of the three stirring rods (center and ring wall) driven by a single motor. The structure is compact, with good transmission synchronization, ensuring coordinated stirring motion. The rotation of the driving gear 34 is directly converted into the fixed-axis rotation of the central main spiral stirring rod 3, forming a strong central axial flow. At the same time, the rotation of the two driven gears 35 is converted into the fixed-axis rotation of the two ring wall convection spiral stirring rods 31. The mechanical linkage of the three stirring rods ensures that their rotation directions are strictly opposite. Thus, on the basis of the flow field of center lifting and wall lifting in the tank 1, strong shearing and convection are superimposed, forming a highly efficient three-dimensional mixing flow field, which greatly improves the homogenization accuracy and efficiency of plastic particles of different compositions and colors.

[0048] To enable the annular convection spiral agitator to move along the inside of the tank 1, an internal gear ring 36 is fixedly installed on the inner wall of the tank 1. Both driven gears 35 mesh with the internal gear ring 36. While the driven gears 35 revolve around the driving gear 34, the teeth of the driven gears 35 also mesh with the fixed internal gear ring 36. This meshing relationship forces the driven gears 35 to rotate on their own axis while revolving around the tank. The rotational motion and the revolving motion are superimposed, so that the annular convection spiral agitator 31 not only rotates planetarily around the central axis of the tank 1, but also rotates continuously on its own axis. This greatly expands the contact and agitation range of the plastic particles at the edge and bottom of the tank 1, completely eliminating the mixing dead zone, and ensuring that plastic particles at any position inside the tank 1 can be fully drawn into the main field, further ensuring the uniformity of the homogenization across the entire area.

[0049] By setting up a homogenization mechanism, the meshing of the driving gear 34 and two driven gears 35 causes the central main spiral stirring rod 3 and the two annular wall convection spiral stirring rods 31 to mix the plastic particles inside the tank 1. In conjunction with the annular motion of the driven gears 35 along the inner wall of the internal tooth ring 36, a high-intensity, dead-angle-free three-dimensional mixing flow field is constructed, realizing high-precision and high-efficiency homogenization of waste plastic particles in terms of color, composition and density.

[0050] The airflow mechanism includes a microporous distribution disk 4 disposed on the inner wall of the tank 1 and air nozzles 41 arranged in a ring array for introducing gas medium into the tank 1.

[0051] To drive the microporous distribution disk 4 to rotate, the airflow mechanism also includes a retaining ring 42 fixedly installed on the outer surface of the tank 1. An external gear ring 43 is slidably engaged with the inner wall of the retaining ring 42. The microporous distribution disk 4 is fixedly connected to the inner wall of the external gear ring 43. A drive gear 44 meshes with the surface of the external gear ring 43. The drive gear 44 is mounted on the surface of the bracket 2 via bearings. A drive motor 45 is fixedly installed on the upper surface of the bracket 2. The output shaft of the drive motor 45 is fixedly sleeved with the axis of the drive gear 44. The drive motor 45 drives the external gear ring 43 through the drive gear 44. Rotating within the retaining ring 42 drives the integrated microporous distribution disk 4 to rotate within the tank 1. By controlling the drive motor 45, the microporous distribution disk 4 can only rotate one revolution in each direction. This rotational motion causes the inert gas ejected from the conical hole 48 of the distribution disk to no longer be static, but to form a dynamic sweeping air curtain. The dynamic air curtain can act more evenly on all materials at the bottom, achieving a gentler and more comprehensive gas-assisted fluidization, reducing the particle friction coefficient, and assisting mixing. At the same time, the rotation also helps to prevent plastic particles from being locally deposited on the surface of the microporous distribution disk 4.

[0052] To prevent plastic particles from accumulating on the microporous distribution disk 4, telescopic cylinders 46 are installed in a ring array on the outer surface of the retaining ring 42. One end of the piston rod of the telescopic cylinder 46 extends through the retaining ring 42 into the tank 1 and is fixedly connected to an arc-shaped push plate 47. The surface of the arc-shaped push plate 47 is slidably connected to the upper surface of the microporous distribution disk 4. The surface of the microporous distribution disk 4 has a conical hole 48. The large-diameter end of the conical hole 48 faces the inside of the tank 1, and the small-diameter end of the conical hole 48 faces the bottom of the tank 1. When plastic particles accumulate on the microporous distribution disk 4, the piston rod of the telescopic cylinder 46 extends and pushes the arc-shaped push plate 47 to move along the surface of the microporous distribution disk 4, gently pushing the plastic particles in the area in front of the push plate towards the conical hole 48, causing the plastic particles to fall under the action of gravity. This combination of mechanical cleaning and airflow assistance actively prevents and solves the problem of poor material discharge, ensuring the long-term stability and reliability of the system.

[0053] To remix materials that are not properly mixed and fall directly from the discharge port, a receiving hopper 49 is installed below the discharge port. A pump body 410 and a storage container 411 are installed on the top of the tank body 1. The suction end of the pump body 410 is connected to the storage container 411 through a pipe. The storage container 411 is connected to the receiving hopper 49 through a suction pipe 412. An auxiliary feed port 413 with a discharge valve is installed at the bottom of the storage container 411. When the intelligent sensing and control unit determines that the homogenization degree of the current batch of materials does not meet the standard, the pump body 410 is activated, pumping the plastic particles in the receiving hopper 49 back to the top of the tank body 1 through the storage container 411 and reintroducing them into the homogenization process through the auxiliary feed port 413. The storage container 411 acts as a buffer, preventing the plastic particles from directly entering the pump body 410 and causing wear or blockage. This loop realizes the automatic and closed-loop recycling and reprocessing of unqualified materials without manual intervention, significantly improving the raw material utilization rate and the first-pass yield of finished products, demonstrating the intelligent closed-loop control capability of the system.

[0054] To dry the plastic granules inside the tank 1, an installation ring 414 is fixedly installed on the surface of the tank 1. Multiple air nozzles 41 are arranged in a ring array and installed on the surface of the installation ring 414 extending into the tank 1. An air guide pipe 415 is fixedly connected to the outer surface of the installation ring 414, and one end of the air guide pipe 415 is connected to a hot air blower 416. The ring array of air nozzles 41 forms a ring-shaped hot air curtain at the top of the tank 1. The drying hot air provided by the hot air blower 416 is evenly distributed to each nozzle through the air guide pipe 415 and sprayed out. This hot air curtain has multiple functions: first, it assists in drying the rising material and removes residual moisture; second, it provides a certain degree of thermal compensation and reduces the temperature gradient inside the tank; and third, it creates lateral airflow interference during the stirring process, breaking the possible regular flow pattern and increasing the probability of random collisions of materials, thereby enhancing the mixing effect.

[0055] To allow dry hot air to enter the tank 1 through the microporous distribution plate 4, a gas supply pipe 417 is fixedly connected to the lower surface of the microporous distribution plate 4. A three-way valve 418 is installed on the surface of the gas supply pipe 417 extending outside the tank 1. A branch pipe 419 is connected to the surface of the gas guide pipe 415. The branch pipe 419 is connected to the gas supply pipe 417 through the three-way valve 418. A suction pump 420 is installed on the surface of the branch pipe 419. An inert gas pipeline 421 is connected to the third end of the three-way valve 418. By using the intelligent switching of the three-way valve 418, the functions of the airflow mechanism at the bottom of the tank 1 can be diversified. During the homogenization stage, dry hot air from the branch pipe 419 can be switched in for bottom air-assisted fluidization. Before the start of the process or when storing sensitive materials, inert gas can be switched in to replace the space inside the tank 1, forming a protective atmosphere to prevent material oxidation and improve the functionality and safety of the equipment.

[0056] By setting up an airflow mechanism that integrates a rotatable microporous distribution disk 4, an annular air nozzle 41, and a multi-functional integrated air path, multiple airflow functions such as dynamic air-assisted fluidization, auxiliary drying, and inertial protection are realized. In addition, the material is cleaned by a mechanical arc-shaped pusher plate 47, which significantly improves the mixing uniformity, process adaptability, and equipment operation reliability.

[0057] Working principle: When in use, first start the drive motor 45. The forward and reverse rotation of the output shaft of the drive motor 45 drives the drive gear 44 connected to it to rotate forward and reverse. The forward and reverse rotation of the drive gear 44 drives the external gear ring 43 meshing with it to rotate forward and reverse. The forward and reverse rotation of the external gear ring 43 drives the microporous distribution disk 4 connected to it to rotate forward and reverse. The intelligent sensing and control unit controls the airflow mechanism and switches through the three-way valve 418 to introduce inert gas into the tank through the rotating microporous distribution disk 4, replacing the air to form a protective atmosphere and prevent the material from oxidizing. Then, the pre-treated waste plastic granules are put into the tank 1 through the main feed port.

[0058] When the stirring motor 32 starts, as a single power source, the rotation of the output shaft of the stirring motor 32 drives the active gear 34 connected to it to rotate. The planetary carrier 33 and the internal gear ring 36 enable the rotation of the active gear 34 to drive the two driven gears 35 meshing with it to rotate while moving along the surface of the internal gear ring 36. This simultaneously drives the central main spiral stirring rod 3 and the two annular wall convection spiral stirring rods 31 to rotate, forming intense wall shearing and convection, thereby constructing a high-intensity, dead-angle-free three-dimensional mixing flow field, which powerfully breaks down the differences in color, composition and density of plastic particles.

[0059] Simultaneously, the airflow mechanism is activated, and the dry hot air generated by the hot air blower 416 is partly sent to the rotating microporous distribution disk 4 through the branch pipe 419, the three-way valve 418 and the air supply pipe 417, forming a dynamic sweeping micro airflow that penetrates the material layer from bottom to top, effectively reducing interparticle friction and assisting mixing. The other part of the dry hot air passes through the annular array air nozzles 41 on the mounting ring 414 to form an annular hot air curtain in the upper part of the tank 1, which assists in drying the rising material and further breaks the regular flow pattern and increases random mixing through the lateral airflow interference.

[0060] During the mixing process, the intelligent sensing and control unit works continuously. The hyperspectral camera monitors the color distribution in real time, the microwave moisture meter monitors the humidity, the near-infrared component analysis probe monitors the components, and the capacitance tomography sensor monitors the cross-sectional image of the material density and distribution. The central controller collects the data, compares and calculates it with the preset digital twin model, and evaluates the homogenization degree of the material in real time. Based on the adaptive fuzzy-PID control algorithm, the central controller dynamically adjusts key parameters such as the speed of the stirring motor 32, the rotation frequency and angle of the drive motor 45 to the microporous distribution disk 4, and the temperature and flow rate of the hot air curtain, so that the mixing process always proceeds along the optimal trajectory.

[0061] When plastic particles accumulate above the microporous distribution disc 4, the telescopic cylinder 46 is activated, pushing the arc-shaped pusher plate 47 to move gently, thus ensuring smooth airflow and discharge.

[0062] Some plastic granules fall directly into the receiving hopper 49 through the discharge port without being fully dried and mixed. Therefore, the pump body 410 is started to pump the plastic granules that have fallen into the receiving hopper 49 back into the tank body 1 through the auxiliary feed port 413 after being buffered by the storage device 411, and then re-enter the mixing process.

[0063] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A precision homogenization tank system for recycling of waste plastic into granules, characterized in that: The application relates to a plastic particle homogenizing device, which comprises a tank body (1) provided with a main feeding port and a discharging port, a support (2) for supporting the tank body (1), a homogenizing mechanism arranged on the tank body (1), an airflow mechanism and an intelligent induction and control unit, the intelligent induction and control unit being in signal connection with the homogenizing mechanism and the airflow mechanism. The homogenizing mechanism comprises a central main spiral stirring rod (3) and two ring wall convection spiral stirring rods (31), the rotation directions of the central main spiral stirring rod (3) and the two ring wall convection spiral stirring rods (31) being opposite, and the central main spiral stirring rod (3) and the two ring wall convection spiral stirring rods (31) being used for three-dimensional mixing of plastic particles. The airflow mechanism comprises a micropore distribution disc (4) arranged on the inner wall of the tank body (1) and gas nozzles (41) arranged in an annular array, and is used for introducing gas medium into the tank body (1). The intelligent induction and control unit comprises a central controller, a hyperspectral camera arranged on the inner wall of the tank body (1), a microwave moisture meter, a near-infrared component analysis probe and a capacitance tomography sensor, the central controller being used for receiving data of the hyperspectral camera, the microwave moisture meter, the near-infrared component analysis probe and the capacitance tomography sensor and dynamically adjusting operation parameters of the homogenizing mechanism and the airflow mechanism based on a preset digital twin model through a self-adaptive fuzzy-PID control algorithm.

2. The system for precise homogenization of waste plastic regenerated granules according to claim 1, characterized in that: The homogenizing mechanism further comprises a stirring motor (32) fixedly installed on the top of the tank body (1), one end of an output shaft of the stirring motor (32) extending into the tank body (1) and being provided with a planet carrier (33) through a bearing, the lower surface of the planet carrier (33) being provided with a driving gear (34) and two driven gears (35) through bearings respectively, the driving gear (34) and the two driven gears (35) being in mesh with each other, and the output shaft of the stirring motor (32) being fixedly sleeved with the shaft center of the driving gear (34).

3. The system for precise homogenization of waste plastic regenerated pellets according to claim 2, characterized in that: The upper end of the central main spiral stirring rod (3) is fixedly sleeved with the shaft center of the driving gear (34), and the upper ends of the two ring wall convection spiral stirring rods (31) are fixedly sleeved with the shaft centers of the two driven gears (35) respectively.

4. The system for precise homogenization of waste plastic regenerated pellets according to claim 2, wherein: The inner wall of the tank body (1) is fixedly provided with an internal gear ring (36), and the two driven gears (35) are in mesh with the internal gear ring (36).

5. The system for precise homogenization of waste plastic regenerated granules as claimed in claim 1, wherein: The airflow mechanism further comprises a blocking ring (42) fixedly installed on the outer surface of the tank body (1), the inner wall of the blocking ring (42) being slidably connected with an external gear ring (43), the micropore distribution disc (4) being fixedly connected with the inner wall of the external gear ring (43), the surface of the external gear ring (43) being in mesh with a driving gear (44), the driving gear (44) being installed on the surface of the support (2) through a bearing, the upper surface of the support (2) being fixedly provided with a driving motor (45), and the output shaft of the driving motor (45) is fixedly sleeved with the shaft center of the driving gear (44).

6. The system for precise homogenization of waste plastic regenerated granules as claimed in claim 5 wherein: The outer surface of the baffle ring (42) is provided with a telescopic cylinder (46) in an annular array, the piston rod of the telescopic cylinder (46) extends through the baffle ring (42) into the tank body (1) and is fixedly connected with an arc-shaped push plate (47), the surface of the arc-shaped push plate (47) is in sliding connection with the upper surface of the microporous distribution disc (4), the surface of the microporous distribution disc (4) is provided with a tapered hole (48), the large-diameter end of the tapered hole (48) faces the inside of the tank body (1), and the small-diameter end of the tapered hole (48) faces the bottom of the tank body (1).

7. The system for precise homogenization of waste plastic regenerated granules as claimed in claim 1, wherein: A material collecting barrel (49) is arranged below the discharge port, a pump body (410) and a material storage device (411) are arranged on the top of the tank body (1), the suction end of the pump body (410) is in communication with the material storage device (411) through a pipeline, the material storage device (411) is in communication with the material collecting barrel (49) through a material suction pipe (412), and the bottom of the material storage device (411) is provided with an auxiliary feeding port (413) provided with a discharge valve.

8. The system for precise homogenization of waste plastic regenerated granules as claimed in claim 1, wherein: An installation ring (414) is fixedly arranged on the surface of the tank body (1), a plurality of air nozzles (41) are arranged in an annular array on the surface of the installation ring (414) extending into the tank body (1), the outer surface of the installation ring (414) is fixedly communicated with an air guide pipe (415), and one end of the air guide pipe (415) is communicated with a hot air blower (416).

9. The system for precise homogenization of waste plastic regenerated granules as claimed in claim 8, wherein: The lower surface of the microporous distribution disc (4) is fixedly communicated with a gas supply pipe (417), the surface of the gas supply pipe (417) extending out of the tank body (1) is provided with a three-way valve (418), the surface of the air guide pipe (415) is communicated with a branch pipe (419), the branch pipe (419) is in communication with the gas supply pipe (417) through the three-way valve (418), the surface of the branch pipe (419) is provided with a suction pump (420), and the third end of the three-way valve (418) is communicated with an inert gas pipeline (421).

10. The system for precise homogenization of waste plastic regenerated granules as claimed in claim 1, wherein: The intelligent sensing and control unit further comprises a touch screen connected with the central controller, which is used to display the real-time image of the material mixing state simulated by the digital twin model and various process parameters.

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