An integrated microwave drying feeding device for plastic mixing machine

Abstract

This invention relates to the field of plastic processing equipment technology, specifically to an integrated microwave drying and feeding device for a plastic mixer, comprising: a pre-stirring and dispersing unit, which includes a housing with an inlet and an outlet, wherein a stirring mechanism for mechanically dispersing plastic particles is disposed within the housing; and a screw conveying and heating unit, which includes a housing and a conveying screw rotatably disposed within the housing, and a power mechanism for driving the conveying screw. This invention, by setting up a gas circulation unit connected to the interior of the screw conveying and heating unit housing, with its outlet connected to the interior of the pre-stirring and dispersing unit housing, conveys the hot gas generated during microwave drying to the pre-stirring chamber. This allows the plastic particles to be preheated and dehumidified by the hot gas from the subsequent drying unit while being mechanically dispersed by the stirring mechanism, achieving heat energy recovery and utilization within the system and helping to reduce overall energy consumption.

Description

Technical Field

[0001] This invention relates to the field of plastic processing equipment technology, and in particular to an integrated microwave drying and feeding device for a plastic mixer. Background Technology

[0002] Before plastic mixing and processing, effective preheating and drying of easily hygroscopic plastic particles (such as PET and PA) is an important step to improve the uniformity of mixing and the quality of the final product. For example, Chinese patent document CN220169877U discloses a material dispersion mechanism for microwave drying equipment. The specification describes that by setting rollers and a toggle shaft at the inlet of the drying chamber to disperse and spread the material, the uniformity of heating in the microwave field is optimized, thereby improving the uniformity of drying from the perspective of improving the spatial distribution of the material.

[0003] However, the above-mentioned solutions, as well as conventional independent drying ovens and heated conveyor equipment in the industry, all have a common drawback: a large amount of medium and low temperature waste heat (such as hot air and water vapor) generated during the drying process is usually directly discharged, resulting in a considerable portion of the energy consumed in drying being wasted. This leads to high overall energy consumption in the pretreatment stage. Therefore, how to reduce the overall energy consumption of the pretreatment process while ensuring improved drying effect has become a technical problem worth solving in this field. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide an integrated microwave drying and feeding device for a plastic mixer to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, the present invention provides an integrated microwave drying and feeding device for a plastic mixer, comprising: A pre-stirring and dispersing unit includes a housing with an inlet and an outlet, wherein a stirring mechanism for mechanically dispersing plastic particles is provided in the housing. The screw conveyor heating unit includes a housing and a conveying screw rotatably disposed within the housing, as well as a power mechanism for driving the conveying screw to operate. The feed end of the housing is connected to the discharge port of the pre-mixing and dispersing unit, and the discharge end of the housing is connected to a plastic mixer. The housing is equipped with a microwave heating device for deep drying of the plastic particles being conveyed. The gas circulation unit has its inlet end connected to the interior of the housing and its outlet end connected to the interior of the housing. It is used to transport the hot gas inside the housing to the housing to preheat the plastic particles during the stirring process.

[0006] As a preferred embodiment of the present invention, the stirring mechanism includes a main shaft rotatably disposed in the housing, and a plurality of stirring rods extending radially along the main shaft.

[0007] As a preferred embodiment of the present invention, the gas circulation unit includes a gas driving mechanism and a gas pipeline connecting the gas driving mechanism, the interior of the screw conveying heating unit housing, and the interior of the pre-stirring dispersion unit housing.

[0008] As a preferred embodiment of the present invention, the stirring rod is rotatably connected to the main shaft, and its connecting end extends into the inner cavity of the main shaft and is connected to a first bevel gear. A fixed crossbar is provided inside the main shaft, and a second bevel gear meshing with the first bevel gear is provided on the crossbar. When the main shaft rotates and drives the stirring rod to revolve, the first bevel gear meshes with the fixed second bevel gear to drive the stirring rod to rotate around its own axis.

[0009] As a preferred embodiment of the present invention, the main shaft and the stirring rod are both hollow structures and are interconnected to form a gas delivery channel. A nozzle communicating with the gas delivery channel is provided on the side wall of the stirring rod, and the gas outlet of the gas circulation unit is connected to the interior of the main shaft.

[0010] As a preferred embodiment of the present invention, the gas drive mechanism is a piston pump, which includes a piston cylinder, a piston slidably disposed in the piston cylinder, and a crank-rocker mechanism for driving the piston to reciprocate.

[0011] As a preferred embodiment of the present invention, the crank end of the crank-rocker mechanism is fixedly connected to one end of the conveying screw that protrudes from the housing, and its rocker end is hinged to the piston, which is used to convert the rotational motion of the conveying screw into the reciprocating motion of the piston.

[0012] As a preferred embodiment of the present invention, the gas pipeline includes: The suction pipe has one end connected to the air collection hood and the other end connected to the piston cylinder as the air inlet. The exhaust pipe has one end connected to the piston cylinder and the other end connected to the end of the main shaft through a rotary joint. Both the intake pipe and the exhaust pipe are equipped with one-way valves. The dust filter installed on the intake pipe and / or exhaust pipe is used to filter the dust-laden hot gas and introduce the filtered hot gas into the housing to achieve heat recycling.

[0013] As a preferred embodiment of the present invention, the housing is provided with a microwave penetration window, and the microwave heating device includes a magnetron and a waveguide connected to the magnetron and guiding microwave energy to the microwave penetration window.

[0014] As a preferred embodiment of the present invention, the power mechanism includes a drive motor, which is installed at one end of the housing, and the output shaft of the drive motor is connected to one end of the conveying screw.

[0015] The beneficial effects of this invention are: This invention incorporates a gas circulation unit connected to the interior of the screw conveyor heating unit. The gas outlet of this unit is connected to the interior of the pre-stirring and dispersing unit. This allows the hot gas generated during microwave drying to be transported to the pre-stirring chamber. Simultaneously, while the plastic particles are mechanically dispersed by the stirring mechanism, they are preheated and dehumidified by the hot gas from the subsequent drying unit. This achieves heat recovery and utilization within the system, helping to reduce overall energy consumption. After this preheating and dispersion, the subsequent microwave drying is more uniform and efficient. Finally, the material delivered to the mixer exhibits improved dryness and temperature uniformity, thus enhancing the mixing quality. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the external three-dimensional structure of the present invention; Figure 2 This is a top view of the structure of the present invention; Figure 3 This is a partial three-dimensional structural diagram of the present invention; Figure 4 This is a schematic diagram of the main cross-section of the present invention; Figure 5 This is a partial cross-sectional three-dimensional structural diagram of the shell of the present invention; Figure 6 For the present invention Figure 5 Enlarged structural diagram at point A in the middle; Figure 7 This is a partial cross-sectional three-dimensional structural diagram of the piston cylinder of the present invention; Figure 8 This is a partial cross-sectional three-dimensional structural diagram of the stirring rod of the present invention.

[0018] The components in the diagram are labeled as follows: 1. Housing; 2. Feeding end; 3. Discharge end; 4. Conveying screw; 5. Drive motor; 6. Microwave heating device; 7. Shell; 8. Support; 9. Feed inlet; 10. Discharge outlet; 11. Main shaft; 12. Driven wheel; 13. Driving wheel; 14. Transmission belt; 15. Fixing sleeve; 16. Stirring rod; 17. Boss; 18. Scraper mounting plate; 19. First positioning hole; 20. Scraper; 21. Second positioning hole; 22. Positioning bolt; 23. Positioning nut; 24. Air passage. 25. Nozzle connecting groove; 26. Nozzle; 27. First bevel gear; 28. Crossbar; 29. ​​Second bevel gear; 30. Bearing seat; 31. Ball bearing; 32. End cap; 33. Positioning sleeve; 34. Positioning pin; 35. Rotary joint; 36. Pipe joint; 37. Connecting pipe; 38. Air outlet pipe; 39. Piston cylinder; 40. Piston; 41. Rocker end; 42. Eccentric shaft; 43. Crank end; 44. Intake pipe; 45. Dust filter; 46. Air collection hood; 47. Piston cylinder mounting bracket. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0020] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0021] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, an integrated microwave drying and feeding device for a plastic mixer includes: a pre-stirring and dispersing unit, which includes a housing 7 with an inlet 9 and an outlet 10, and a stirring mechanism for mechanically dispersing plastic particles in the housing 7; a screw conveying and heating unit, which includes a housing 1 and a conveying screw 4 rotatably disposed in the housing 1, and a power mechanism for driving the conveying screw 4 to operate, the inlet 2 of the housing 1 is connected to the outlet 10 of the pre-stirring and dispersing unit, the outlet 3 of the housing 1 is connected to the plastic mixer, and a microwave heating device 6 is provided on the housing 1 for deep drying of the conveyed plastic particles; and a gas circulation unit, whose inlet is connected to the interior of the housing 1 and whose outlet is connected to the interior of the housing 7, for conveying hot gas from the housing 1 to the housing 7 to preheat the plastic particles during the stirring process. The above technical solution solves the key process problem of uneven mixing and increased energy consumption of plastic granules with other components (such as heat-sensitive additives and color masterbatches) due to excessively low temperature and high surface humidity before entering the main mixer. During operation, the microwave heating device 6 generates a large amount of hot gas when deeply drying the plastic granules in the screw conveyor heating unit. In the traditional method, this heat energy is directly discharged with the exhaust gas, resulting in energy waste. However, this device actively extracts this hot gas from the casing 1 by setting a gas circulation unit and transports it to the casing 7 of the pre-stirring and dispersing unit. When the moist, low-temperature plastic granules enter the casing 7 from the feed inlet 9 and are dispersed by the stirring mechanism, the hot gas introduced from the inside comes into full contact with the granules, preheating and dehumidifying them. By recovering and utilizing the waste heat generated in the drying process to preheat the raw materials, the energy consumption of the main mixer for heating is reduced, and the materials enter the mixing process in a better thermal state, improving the mixing efficiency and the uniformity of the final product.

[0022] like Figure 4 and Figure 5 As shown, in this embodiment, the stirring mechanism includes a main shaft 11 rotatably disposed in the housing 7, and a plurality of stirring rods 16 extending radially along the main shaft 11; The above-mentioned technical solution can solve the fundamental problem of uneven initial material state and agglomeration, which makes it difficult for subsequent hot air preheating or microwave drying to achieve uniform penetration and heating. Specifically, in the pre-stirring and dispersing unit, a mechanical stirring mechanism consisting of a main shaft 11 and a radial stirring rod 16 is set up. Its primary purpose is to forcibly disperse the input plastic particles. Many plastic raw materials (especially recycled materials or materials that have absorbed moisture) are prone to agglomeration, which will become difficult-to-handle "wet cores" if directly introduced into subsequent processes. Activating this mechanism, the rotating stirring rod 16 can effectively break up and crush large clumps of material, increase the specific surface area of ​​the material, and create the necessary physical conditions for efficient and uniform heat transfer in the subsequent process.

[0023] like Figure 3 and Figure 7 As shown, in this embodiment, the gas circulation unit includes a gas driving mechanism and a gas pipeline connecting the gas driving mechanism, the inside of the screw conveying heating unit housing 1, and the inside of the pre-stirring and dispersing unit housing 7. The above technical solution can solve the specific engineering problem of how to reliably and efficiently introduce the waste heat of the drying zone into the preheating zone. Specifically, the gas circulation unit consists of a gas drive mechanism and a gas pipeline. Its function is to provide power and channels for the directional flow of hot gas, forming a forced circulation "hot air loop". This ensures a stable supply of the heat medium required for preheating, and transforms heat energy recovery from passive utilization to an active and controllable process.

[0024] like Figure 5 As shown, in this embodiment, the stirring rod 16 is rotatably connected to the main shaft 11, and its connecting end extends into the inner cavity of the main shaft 11 and is connected to a first bevel gear 27. A fixed crossbar 28 is provided inside the main shaft 11, and a second bevel gear 29 that meshes with the first bevel gear 27 is provided on the crossbar 28. When the main shaft 11 rotates and drives the stirring rod 16 to revolve, the first bevel gear 27 meshes with the fixed second bevel gear 29 to drive the stirring rod 16 to rotate around its own axis. The above technical solution solves the problems of insufficient dispersion of viscous and easily agglomerated materials and the existence of mixing dead zones in conventional mixing methods. Specifically, when processing plastic granules with high viscosity or easy adhesion, the rotating stirring rod 16 alone can easily push the material to rotate as a whole, with limited shearing and tumbling effects. The introduction of rotation makes the stirring rod 16 act like a high-speed rotating drill, penetrating deep into the material pile to produce radial shearing and axial tumbling of the granules. The material is fluidized in the pre-mixing chamber, achieving a state close to monomer separation, which promotes the contact and heat exchange between the subsequent hot gas and the surface of each granule.

[0025] like Figure 5 and Figure 8 As shown, in this embodiment, the main shaft 11 and the stirring rod 16 are both hollow structures and are interconnected to form a gas delivery channel. The side wall of the stirring rod 16 is provided with a nozzle 26 that is connected to the gas delivery channel. The gas outlet of the gas circulation unit is connected to the interior of the main shaft 11. The above technical solution solves the heat transfer bottleneck problems of hot air short-circuiting, difficulty in penetrating dense material layers, and short contact time with particles under static or macroscopic airflow distribution. Specifically, the main shaft 11 and stirring rod 16 are designed to be hollow and equipped with nozzles 26. The core purpose is to directly embed the hot gas delivery terminal into the core area where the material movement is most intense. The hot gas is no longer statically blown in from the top or side wall of the cavity, but is ejected from inside the high-speed moving and continuously rotating stirring rod 16. This achieves intense disturbance and mixing of the gas and solid phases at the microscopic scale, and the hot gas is directly "injected" into the material flow, effectively improving the heat transfer rate and uniformity, and increasing preheating efficiency.

[0026] like Figure 3 and Figure 7 As shown, in this embodiment, the gas drive mechanism is a piston pump, which includes a piston cylinder 39, a piston 40 slidably disposed in the piston cylinder 39, and a crank-rocker mechanism for driving the piston 40 to reciprocate. The above technical solution can solve the long-term operational reliability problems of gas-driven components in industrial hot air environments containing trace amounts of dust and volatiles, such as easy wear, decreased reliability, and frequent maintenance. Specifically, the piston pump is selected as the gas-driven mechanism mainly because of its strong adaptability to the working medium. The circulating gas contains low-molecular-weight substances volatilized from plastics when heated and trace amounts of dust, which easily adhere and form scale on the centrifugal fan impeller, affecting dynamic balance. The piston pump operates by volumetric changes, is not sensitive to the cleanliness of the gas, is more resistant to contamination, and ensures the operational stability and long service life of the entire thermal energy circulation system under harsh conditions.

[0027] like Figure 3 and Figure 4 As shown, in this embodiment, the crank end 43 of the crank-rocker mechanism is fixedly connected to one end of the conveying screw 4 that protrudes from the housing 1, and its rocker end 41 is hinged to the piston 40, which is used to convert the rotational motion of the conveying screw 4 into the reciprocating motion of the piston 40. The above technical solution solves the economic and integration problems caused by adding an independent power source to the heat recovery system, such as increased structural complexity, manufacturing costs, and overall energy consumption. Specifically, the crank end 43 of the piston pump is directly fixed to the shaft end of the conveying screw 4. The essence of this design is to achieve "zero-cost" reuse of power. The rotation of the conveying screw 4 is the necessary main action of the device. This rotational power is directly converted into the driving force of the piston pump through a mechanical structure (crank rocker). No additional motor is required. Through a simple pure mechanical linkage, the core functions are tightly coupled, making the device compact and highly energy efficient.

[0028] like Figure 3 and Figure 7As shown, in this embodiment, the gas pipeline includes: an intake pipe 44, one end of which is connected to a gas collecting hood 46, which is funnel-shaped and preferably installed inside the housing 1 near the discharge end 3, for efficiently collecting hot gas rising due to microwave drying; the other end of which is connected to a piston cylinder 39 as an intake end; an exhaust pipe 38, one end of which is connected to the piston cylinder 39, and the other end of which is connected to the end of the main shaft 11 through a rotary joint 35; both the intake pipe 44 and the exhaust pipe 38 are equipped with one-way valves; and a dust filter 45 installed on the intake pipe 44 and / or the exhaust pipe 38 for filtering dust-laden hot gas and introducing the filtered hot gas into the housing 7 to achieve heat recycling. The above technical solution can eliminate the risks of raw material contamination and system blockage associated with the thermal energy recycling process. Specifically, during the microwave drying and screw conveying friction process, fine plastic dust with a particle size of less than 10μm and a small amount of low-molecular-weight volatiles are generated. By installing a dust filter 45 in the gas pipeline, the micron-sized plastic dust generated by microwave drying and particle conveying friction is directly targeted. This prevents the dust from entering the preheating chamber with the hot air and adhering to the surface of the raw materials, contaminating the raw materials and affecting the purity of the final product, or from accumulating in the hollow stirring rod 16 and nozzle 26, which could cause blockage. This achieves energy saving while...

[0029] like Figure 3 and Figure 4 As shown, in this embodiment, the housing 1 is provided with a microwave penetration window. The microwave heating device 6 includes a magnetron and a waveguide connected to the magnetron and guiding microwave energy to the microwave penetration window. Specifically, the microwave penetration window is made of microwave-transparent and high-temperature resistant ceramic (such as alumina ceramic). It is tightly installed at the opening of the housing 1 through a flange with a conductive sealing ring to ensure no microwave leakage. The end of the waveguide of the microwave heating device 6 is sealed to the flange to radiate microwave energy directionally into the interior of the housing 1. The above-mentioned technical solution overcomes the inherent defects of traditional heat conduction methods such as electric heating coils, hot air from the surface to the interior, large temperature gradients, slow drying speed, high energy consumption, and easy overheating of the surface material. The core advantage of using a microwave heating device 6 in conjunction with a microwave penetration window for drying the material lies in its rapid and uniform volumetric heating characteristics. Microwave energy acts directly on the water molecules inside the material, causing the entire material to heat up synchronously and the moisture to evaporate rapidly. The drying efficiency is high, and it can generate a large amount of uniformly heated gas within the casing 1, providing a high-quality and sufficient heat source for thermal energy circulation.

[0030] like Figure 1 and Figure 3 As shown, in this embodiment, the power mechanism includes a drive motor 5, which is installed at one end of the housing 1, and the output shaft of the drive motor 5 is connected to one end of the conveying screw 4; The above technical solution adopts the method of directly connecting the drive motor 5 to the conveying screw 4, which provides the most direct and efficient power foundation for the material conveying of the entire device, ensuring that the power source of the core conveying function is simple and reliable, and avoiding energy loss and potential failure points caused by complex transmission chains.

[0031] like Figure 1 and Figure 3 As shown, in this embodiment, the device further includes: a drive wheel 13, which is connected to the output shaft of the drive motor 5; a driven wheel 12, which is fixedly connected to one end of the main shaft 11; and a transmission belt 14, which connects the drive wheel 13 and the driven wheel 12. The above technical solution can solve the problem of synchronous coordination between the two actions of pre-mixing and screw conveying. During operation, the power of the drive motor 5 is distributed to the pre-mixing main shaft 11 through the belt drive mechanism (drive wheel 13, driven wheel 12, and transmission belt 14). Its core purpose is to realize the dual core actions driven by a single power source, without the need for complex electrical control synchronization or multi-motor configuration. The mechanical synchronization is reliable, the control is simple, and the cost is reduced.

[0032] like Figure 5 As shown, in this embodiment, a cylindrical cavity is formed inside the housing 7. The main shaft 11 is rotatably arranged on the axis of the cylindrical cavity. A plurality of stirring rods 16 are distributed radially along the main shaft 11 and spaced apart axially along the main shaft 11 to cover the main working length of the cylindrical cavity. The end of the stirring rod 16 is provided with a scraper 20 that fits against the inner wall of the cylindrical cavity. The above technical solution can effectively solve the problem of sticking and arching of high-moisture viscous materials in the early stage of preheating, and ensure the continuity of material flow and sufficient heat exchange. Specifically, in the initial stage, the plastic particles to be processed usually have high humidity and high surface viscosity. Although the amount of dust generated is small, they are very easy to stick to the inner wall of the shell 7 to form stubborn lumps, which affect heat transfer and material flow. Therefore, in this device, a scraper 20 that fits against the inner wall is specially set at the end of the stirring rod 16 inside the shell 7 of the pre-stirring and dispersing unit. The purpose is to use the scraper 20 to continuously scrape off the inner wall while the stirring mechanism mechanically crushes the wet and sticky material lumps, and to combine with the hot gas introduced inside for auxiliary heating. As the material undergoes preheating and initial drying before entering the screw conveyor heating unit, its physical state changes: surface moisture decreases and viscosity reduces. However, due to inter-particle friction and microwave drying, the amount of fine dust generated increases significantly. If this dust is not treated, it will not only contaminate the preheated clean material, affecting the purity of the final mixed product, but also cause dust pollution in the working environment. Therefore, this device actively extracts the dust-laden hot gas from the screw conveyor heating unit housing 1 using a piston pump mechanism directly driven by the conveying screw 4, and guides it through the dust filter 45 for purification. The filtered clean hot gas is recycled for preheating, while the dust is efficiently retained, improving thermal energy utilization while ensuring material cleanliness and improving the working environment.

[0033] like Figure 5 and Figure 8 As shown, in this embodiment, a scraper mounting plate 18 is provided at the end of the stirring rod 16. At least two first positioning holes 19 are provided on the surface of the scraper mounting plate 18, and a second positioning hole 21 corresponding to the first positioning hole 19 is provided on the surface of the scraper 20. The positioning bolt 22 passes through the first positioning hole 19 and the second positioning hole 21 in sequence and is connected to the positioning nut 23 at the end. The above technical solution can solve the problem of equipment maintenance convenience, reduce downtime and maintenance costs. The scraper is a vulnerable part. The scraper 20 is easy to maintain and replace through the detachable installation method of positioning hole, positioning bolt 22 and positioning nut 23.

[0034] like Figure 5 and Figure 6 As shown, in this embodiment, a bearing seat 30 is provided at one end of the housing 7, a ball bearing 31 is provided in the bearing seat 30, the ball bearing 31 is rotatably engaged with one end of the main shaft 11, a positioning pin 34 is formed at the end of the crossbar 28, an end cover 32 is connected to the end of the bearing seat 30, and a positioning sleeve 33 is provided on the inner side of the end cover 32 to engage with the positioning pin 34. The above technical solution allows for the fixation of the crossbar 28 through the insertion and removal of the locating pin 34 and the locating sleeve 33, ensuring the precise meshing of the transmission gear pair (bevel gear). This fixing method provides a stable and reliable anti-rotation constraint, facilitates alignment during assembly, and guarantees the meshing accuracy and long-term operational stability of the stirring rod 16's self-rotation transmission system.

[0035] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.

[0036] This invention aims to cover all such substitutions, modifications, and variations that fall within the scope of protection. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. An integrated microwave drying and feeding device for a plastic mixer, characterized in that, include: The pre-stirring and dispersing unit includes a housing (7) with an inlet (9) and an outlet (10), wherein a stirring mechanism for mechanically dispersing plastic particles is provided in the housing (7); The screw conveying heating unit includes a housing (1) and a conveying screw (4) rotatably disposed in the housing (1), and a power mechanism for driving the conveying screw (4) to operate. The feed end (2) of the housing (1) is connected to the discharge port (10) of the pre-stirring and dispersing unit. The discharge end (3) of the housing (1) is connected to the plastic mixer. The housing (1) is provided with a microwave heating device (6) for deep drying of the plastic particles being conveyed. The gas circulation unit has its inlet end connected to the interior of the housing (1) and its outlet end connected to the interior of the shell (7). It is used to transport the hot gas in the housing (1) to the shell (7) to preheat the plastic particles during the stirring process.

2. The integrated microwave drying and feeding device for a plastic mixer according to claim 1, characterized in that, The stirring mechanism includes a main shaft (11) rotatably disposed in the housing (7) and a plurality of stirring rods (16) extending radially along the main shaft (11).

3. The integrated microwave drying and feeding device for a plastic mixer according to claim 1, characterized in that, The gas circulation unit includes a gas drive mechanism and a gas pipeline connecting the gas drive mechanism, the inside of the screw conveying heating unit housing (1), and the inside of the pre-stirring dispersion unit housing (7).

4. The integrated microwave drying and feeding device for a plastic mixer according to claim 2, characterized in that, The stirring rod (16) is rotatably connected to the main shaft (11), and its connecting end extends into the inner cavity of the main shaft (11) and is connected to a first bevel gear (27). A fixed crossbar (28) is provided inside the main shaft (11), and a second bevel gear (29) meshes with the first bevel gear (27) on the crossbar (28). When the main shaft (11) rotates and drives the stirring rod (16) to revolve, the first bevel gear (27) meshes with the fixed second bevel gear (29) to drive the stirring rod (16) to rotate around its own axis.

5. The integrated microwave drying and feeding device for a plastic mixer according to claim 4, characterized in that, The main shaft (11) and the stirring rod (16) are both hollow structures and are interconnected to form a gas delivery channel. The stirring rod (16) has a nozzle (26) on its side wall that is connected to the gas delivery channel. The gas outlet of the gas circulation unit is connected to the interior of the main shaft (11).

6. The integrated microwave drying and feeding device for a plastic mixer according to claim 3, characterized in that, The gas drive mechanism is a piston pump, which includes a piston cylinder (39), a piston (40) slidably disposed in the piston cylinder (39), and a crank rocker mechanism for driving the piston (40) to reciprocate.

7. The integrated microwave drying and feeding device for a plastic mixer according to claim 6, characterized in that, The crank end (43) of the crank rocker mechanism is fixedly connected to one end of the conveying screw (4) that protrudes from the housing (1), and its rocker end (41) is hinged to the piston (40) to convert the rotational motion of the conveying screw (4) into the reciprocating motion of the piston (40).

8. The integrated microwave drying and feeding device for a plastic mixer according to claim 7, characterized in that, The gas pipeline includes: The suction pipe (44) is connected at one end to the air collection hood (46) and at the other end to the piston cylinder (39) as the air inlet. The exhaust pipe (38) is connected at one end to the piston cylinder (39) and at the other end to the end of the main shaft (11) through a rotary joint (35). Both the intake pipe (44) and the exhaust pipe (38) are equipped with one-way valves. The dust filter (45) installed on the intake pipe (44) and / or the exhaust pipe (38) is used to filter the dust-laden hot gas and introduce the filtered hot gas into the housing (7) to achieve heat recycling.

9. The integrated microwave drying and feeding device for a plastic mixer according to claim 1, characterized in that, The housing (1) is provided with a microwave penetration window, and the microwave heating device (6) includes a magnetron and a waveguide connected to the magnetron and guiding microwave energy to the microwave penetration window.

10. The integrated microwave drying and feeding device for a plastic mixer according to claim 2, characterized in that, The power mechanism includes a drive motor (5), which is installed at one end of the housing (1), and the output shaft of the drive motor (5) is connected to one end of the conveying screw (4).

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