A granulation device for recycling waste plastics

Abstract

The application discloses a granulating device for waste plastic recycling, and relates to the technical field of waste plastic recycling. The granulating device comprises a base frame, a granulator, a machine frame fixedly arranged on the lower surface of the granulator, and a feeding mechanism for removing dust from waste plastic particles and feeding the waste plastic particles into the inner cavity of the granulator. A switching mechanism is arranged on the upper surface of the base frame and used for switching the flow direction of the waste plastic. The upper surface of the base frame is fixedly provided with a support, the top end of the support is fixedly provided with an inclined pipe, the feeding mechanism is arranged in the inner cavity of the inclined pipe, the switching mechanism is arranged on the lower surface of the inclined pipe, and the upper surface of the inclined pipe is provided with a feeding port. The upper surface of the granulator is fixedly provided with a wrapping box. The granulating device for waste plastic recycling can remove dust from waste plastic particles and preheat the waste plastic particles.

Description

Technical Field

[0001] This invention relates to the field of waste plastic recycling technology, specifically to a granulation device for waste plastic recycling. Background Technology

[0002] Recycling waste plastics is an important way to solve plastic pollution and achieve resource recycling. The granulation process involves washing, crushing, and melting waste plastics to produce new plastic granules for downstream manufacturing companies. During the granulation process, waste plastic granules often contain a large amount of dust, fine impurities, and lightweight foreign matter. If these impurities are directly fed into the granulator for melting, they will affect the color, purity, and mechanical properties of the recycled plastic granules, reducing their market value. Therefore, pre-treatment of waste plastic granules for dust removal before granulation is a crucial step in ensuring the quality of the recycled granules.

[0003] However, existing dust removal equipment and feeding equipment operate independently. When materials are transferred between the two, due to the drop and airflow disturbance during the conveying process, some of the separated dust will re-attach to the particle surface, resulting in "secondary dust" phenomenon, which weakens the actual effect of the preceding dust removal to a certain extent. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution: a granulation device for recycling waste plastics, comprising a base frame and a granulator, and a frame fixed to the lower surface of the granulator, wherein the frame is fixed to the upper surface of the base frame, and further comprising:

[0005] A feeding mechanism is used to remove dust from waste plastic granules and feed them into the inner cavity of the granulator;

[0006] A switching mechanism is used to switch the flow direction of waste plastics;

[0007] A support is fixed on the upper surface of the base frame, an inclined tube is fixed at the top of the support, the feeding mechanism is located in the inner cavity of the inclined tube, the switching mechanism is located on the lower surface of the inclined tube, and a feed inlet is provided on the upper surface of the inclined tube.

[0008] The granulator has a packaging box fixed on its upper surface, a heating coil installed in the inner cavity of the packaging box, and a transformer fixed on the outer surface of the packaging box, which is connected to the heating coil.

[0009] Preferably, the feeding mechanism includes a first connecting frame and a fixed cylinder. The first connecting frame is fixed on the outer surface of the inclined tube, and the fixed cylinder is fixed at the bottom end of the inclined tube. A vent frame is rotatably connected to the inner wall of the fixed cylinder via a rolling bearing. A connecting column is fixed on the lower surface of the vent frame, and a rotating frame is fixed at the end of the connecting column away from the vent frame. The rotating frame is rotatably connected to the bottom end of the fixed cylinder.

[0010] Preferably, an impeller is fixed to the inner wall of the ventilated frame, and a first stepper motor is fixed to the inner wall of the first connecting frame. The output end of the first stepper motor is equipped with a drive wheel through a coupling, and the drive wheel is connected to the rotating frame through a belt.

[0011] Preferably, a connecting pipe runs through the upper surface of the package box, a three-way valve is fixedly installed at the end of the connecting pipe, a discharge pipe is fixedly installed at one end of the three-way valve, and a connecting pipe is fixedly installed at the top of the three-way valve. The end of the connecting pipe away from the three-way valve is rotatably connected to the inner cavity of the rotating frame.

[0012] Preferably, an air outlet cover is fixedly provided at the top opening of the vent frame, and a plurality of annularly distributed air jets are penetrating the upper surface of the air outlet cover. The air jets are inclined, a screen frame is fixedly provided on the upper surface of the air outlet cover, an agitator plate is fixedly provided on the upper surface of the screen frame, a sealing ring is fixedly provided on the inner wall of the inclined tube, the screen frame is rubbed against the inner wall of the sealing ring, and the feed inlet is located above the screen frame.

[0013] Preferably, the switching mechanism includes a second stepper motor, which is fixed to the outer surface of the bracket via a second connecting frame. A rotating rod is mounted on the output end of the second stepper motor via a coupling. An opening is provided on the lower surface of the inclined tube. A sealing plate is fixed on the outer surface of the rotating rod, which is adapted to the opening on the lower surface of the inclined tube. A limiting frame is sleeved on the outer surface of the rotating rod, and the end of the limiting frame is fixed to the inner wall of the inclined tube.

[0014] Preferably, the switching mechanism further includes an inverted funnel, which is fixed in the middle of the inner cavity of the inclined tube. A spring hose is fixed at the opening of the inverted funnel, and a connecting cylinder is fixed at the end of the spring hose away from the inverted funnel. The connecting cylinder is fixed on the surface of the sealing plate.

[0015] Preferably, an air inlet box is fixedly provided at the top of the inner wall of the inclined tube, a screen is fixedly provided at the inner wall of the air inlet box, and a rubber ring is fixedly provided at the end of the connecting cylinder away from the spring hose. When the sealing plate comes into contact with the opening of the inclined tube, the rubber ring is squeezed and fitted with the air inlet box.

[0016] Preferably, the granulator has a feed pipe running through its hopper, and a feed ring is fixed at the top of the feed pipe. When the angle between the sealing plate and the inclined pipe is 90°, the rubber ring and the feed ring are squeezed and fitted together.

[0017] This invention provides a granulation device for recycling waste plastics. It has the following beneficial effects:

[0018] I. This waste plastic recycling granulation equipment, through the setting of a feeding mechanism, can agitate the waste plastic granules and at the same time use the airflow generated by the rotation to remove dust from the waste plastic granules, so as to prevent dust from affecting the granulation quality during the granulation process. At the same time, it can transport the dust-removed plastic granules into the inner cavity of the granulator, ultimately realizing the integration of dust removal and feeding.

[0019] II. This waste plastic recycling granulation equipment, by setting a switching mechanism, can switch to dust removal mode when the feeding mechanism is removing dust from the waste plastic granules, thereby allowing outside air to enter and carry out the dust in the waste plastic granules with the airflow. At the same time, it can switch to conveying mode when the feeding mechanism is conveying the waste plastic granules, connecting the feeding mechanism and the inner cavity of the granulator to realize the switching control between the dust removal and conveying modes.

[0020] Third, this waste plastic recycling granulation equipment, by incorporating an inclined tube, serves as a conveying channel for waste plastic granules. The inclined tube is at a 45° angle to the ground; its inclination allows the granules to move obliquely upwards after being blown by airflow and then automatically slide down under gravity, thus achieving a stirring effect on the waste plastic granules. A feed inlet, penetrating the upper surface of the inclined tube, serves as the inlet for the waste plastic granules to enter the inner cavity of the inclined tube.

[0021] IV. This waste plastic recycling granulation equipment, by setting up a wrapping box, provides an installation cavity and protection for the heating coil, preventing heat loss and the entry of external debris. At the same time, the outer side of the wrapping box has horizontally evenly distributed vent holes, which allow outside air to enter the inner cavity of the wrapping box. When suction is generated in the inner cavity of the feeding mechanism, the heated air in the inner cavity of the wrapping box can come into contact with the dust-removed waste plastic granules, realizing the preheating of the waste plastic granules. In turn, it can increase the melting speed when the plastic granules melt.

[0022] V. This waste plastic recycling granulation equipment, by incorporating an impeller, generates a high-speed airflow as it rotates with the ventilation frame, producing airflow in different directions depending on whether the ventilation frame rotates clockwise or counterclockwise. A primary stepper motor serves as the rotational drive source for the feeding mechanism, with precisely controllable rotation speed. The rotational speed can be adjusted according to the type and dust content of the plastic granules, thereby controlling the dust removal intensity. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the dust removal mode structure of a granulation equipment for recycling waste plastics according to the present invention;

[0024] Figure 2 This is a schematic diagram of the conveying mode structure of a granulation equipment for recycling waste plastics according to the present invention;

[0025] Figure 3 This is a front view of the structure of a granulation device for recycling waste plastics according to the present invention;

[0026] Figure 4 This is a partial structural diagram of a granulation device for recycling waste plastics according to the present invention;

[0027] Figure 5 This is a schematic diagram of the feeding mechanism of the present invention;

[0028] Figure 6 This is a partial structural diagram of the feeding mechanism of the present invention;

[0029] Figure 7 This is a schematic cross-sectional view of the feeding mechanism of the present invention;

[0030] Figure 8 This is a schematic diagram of the jet nozzle structure of the present invention;

[0031] Figure 9 This is a schematic diagram of the dust removal mode switching mechanism of the present invention;

[0032] Figure 10 This is a schematic diagram of the conveying mode structure of the switching mechanism of the present invention.

[0033] In the diagram: 1. Base frame; 2. Machine frame; 3. Granulator; 4. Support; 5. Inclined tube; 6. Feeding mechanism; 61. First connecting frame; 62. First stepper motor; 63. Drive wheel; 64. Belt; 65. Fixed cylinder; 66. Rolling bearing; 67. Ventilation frame; 68. Rotating frame; 69. Connecting column; 610. Impeller; 611. Exhaust cover; 612. Air nozzle; 613. Screen frame; 614. Stirring plate; 615. Sealing ring; 7. Switching mechanism; 71. Second stepper motor; 72. Rotating rod; 73. Sealing plate; 74. Connecting cylinder; 75. Rubber ring; 76. Limiting frame; 77. Spring hose; 78. Inverted funnel; 79. Air inlet box; 710. Screen; 8. Feed pipe; 9. Feed ring; 10. Packing box; 11. Heating coil; 12. Transformer; 13. Connecting pipe; 14. Three-way valve; 15. Discharge pipe; 16. Connecting pipe; 17. Feed inlet. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

[0035] like Figures 1-3 As shown, the present invention provides a technical solution: a granulation device for recycling waste plastics, including a base frame 1 and a granulator 3, and a frame 2 fixed to the lower surface of the granulator 3. The frame 2 is fixed to the upper surface of the base frame 1. By setting the base frame 1, a stable installation platform is provided for the entire device, ensuring the stability and reliability of the equipment during operation. By setting the granulator 3 as the core equipment for melting and granulating waste plastics, the plastic particles after dust removal and screening are heated, melted, and extruded into granules to form recycled plastic granules. This granulator 3 is existing technology and can convert the waste plastics processed by this device into plastic granules during use.

[0036] A support 4 is fixed to the upper surface of the base frame 1, and an inclined tube 5 is fixed to the top of the support 4. A feeding mechanism 6 is located in the inner cavity of the inclined tube 5, and a switching mechanism 7 is located on the lower surface of the inclined tube 5. An inlet 17 is provided through the upper surface of the inclined tube 5. By setting the inclined tube 5, it can serve as a conveying channel for waste plastic granules. The angle between the inclined tube 5 and the ground is 45°. Its inclined setting allows the granules to move obliquely upward after being blown by the airflow and to automatically slide down under the action of gravity, thereby achieving the agitation effect of the waste plastic granules. The inlet 17 is provided, which penetrates the upper surface of the inclined tube 5, serving as the inlet for the waste plastic granules to be fed into the inner cavity of the inclined tube 5.

[0037] A wrapping box 10 is fixedly mounted on the upper surface of the granulator 3. A heating coil 11 is installed inside the wrapping box 10, and a transformer 12 is fixedly mounted on the outer surface of the wrapping box 10, which is connected to the heating coil 11. By setting up the wrapping box 10, a cavity and protection are provided for the heating coil 11, preventing heat loss and the entry of external debris. At the same time, the outer side of the wrapping box 10 has horizontally evenly distributed vent holes, which allow outside air to enter the inner cavity of the wrapping box 10. When suction is generated in the inner cavity of the feeding mechanism 6, the heated air in the inner cavity of the wrapping box 10 can come into contact with the dust-removed waste plastic granules, realizing the preheating of the waste plastic granules. This increases the melting speed when the plastic granules melt. By setting up the heating coil 11, heat is generated after being energized to heat the granulator 3, causing the plastic granules inside the granulator 3 to melt. Under the operation of the extrusion device inside the granulator 3, the melted plastic is re-deformed. By setting up transformer 12, the external power supply voltage is converted into the working voltage required by the heating coil 11. The heating temperature is controlled by adjusting the output power of transformer 12, thereby achieving precise control of the granulation temperature.

[0038] like Figures 4-8 As shown, the waste plastic recycling granulation equipment also includes a feeding mechanism 6, which is used to remove dust from the waste plastic granules and feed them into the inner cavity of the granulator 3. By setting up the feeding mechanism 6, the waste plastic granules can be stirred, and the airflow generated by the rotation can remove dust from the waste plastic granules, preventing dust from affecting the granulation quality during granulation. At the same time, the dust-removed plastic granules can be transferred to the inner cavity of the granulator 3, ultimately realizing the integration of dust removal and feeding.

[0039] The feeding mechanism 6 includes a first connecting frame 61 and a fixed cylinder 65. The first connecting frame 61 is fixed to the outer surface of the inclined tube 5, and the fixed cylinder 65 is fixed to the bottom end of the inclined tube 5. A vent frame 67 is rotatably connected to the inner wall of the fixed cylinder 65 via a rolling bearing 66. A connecting post 69 is fixed to the lower surface of the vent frame 67, and a rotating frame 68 is fixed to the end of the connecting post 69 away from the vent frame 67. The rotating frame 68 is rotatably connected to the bottom end of the fixed cylinder 65. By setting the fixed cylinder 65 as the mounting cavity for the vent frame 67, the rolling bearing 66 supports the vent frame 67 to rotate smoothly within the fixed cylinder 65. By setting the rolling bearing 66, the vent frame 67 is supported to rotate smoothly within the fixed cylinder 65, reducing the frictional resistance during rotation. By setting the vent frame 67, which is rotatably connected to the inner cavity of the fixed cylinder 65, several annularly distributed vents are opened on both the upper and lower surfaces of the vent frame 67, allowing airflow to pass through the vent frame 67. By setting the connecting post 69, the ventilated frame 67 can be connected to the rotating frame 68, thereby transmitting the rotational power of the rotating frame 68 to the ventilated frame 67.

[0040] An impeller 610 is fixed to the inner wall of the venting frame 67, and a first stepper motor 62 is fixed to the inner wall of the first connecting frame 61. A drive wheel 63 is mounted on the output end of the first stepper motor 62 via a coupling, and the drive wheel 63 is connected to the rotating frame 68 via a belt 64. By setting the impeller 610, a high-speed airflow is generated when it rotates with the venting frame 67, producing airflow in different directions when the venting frame 67 rotates clockwise or counterclockwise. The first stepper motor 62 serves as the rotational drive source for the feeding mechanism 6, with its rotational speed precisely controllable. The rotational speed can be adjusted according to the type and dust content of the plastic particles to control the dust removal intensity. The drive wheel 63 rotates with the first stepper motor 62 and transmits power to the rotating frame 68 via the belt 64. Driven by the first stepper motor 62, the drive wheel 63 rotates, and the connecting column 69 drives the venting frame 67 to rotate synchronously.

[0041] A connecting pipe 13 runs through the upper surface of the packaging box 10. A three-way valve 14 is fixed to one end of the connecting pipe 13. A discharge pipe 15 is fixed to one end of the three-way valve 14, and a connecting pipe 16 is fixed to the top of the three-way valve 14. The end of the connecting pipe 16 away from the three-way valve 14 is rotatably connected to the inner cavity of the rotating frame 68. By setting the connecting pipe 13 through the upper surface of the packaging box 10, the inner cavity of the inclined pipe 5 is connected to the packaging box 10 through the three-way valve 14. By setting the three-way valve 14, the connecting pipe 13, the discharge pipe 15, and the connecting pipe 16 are connected to switch the airflow direction. Gas can be discharged to the discharge pipe 15 or sent back to the inner cavity of the inclined pipe 5 through the connecting pipe 16, realizing the recycling or directional discharge of airflow. By setting the discharge pipe 15 and fixing it to one end of the three-way valve 14, the exhaust gas discharged from the granulator 3 is guided to the external treatment system to prevent environmental pollution. By setting the connecting pipe 16, the three-way valve 14 is connected to the inner cavity of the rotating frame 68. When dust removal from waste plastic granules is required, the impeller 610 is rotated clockwise, and the three-way valve 14 is simultaneously controlled to connect the connecting pipe 16 to the discharge pipe 15, while disconnecting the air passage of the connecting pipe 16 from the air passage of the connecting pipe 13. This allows the dust in the waste plastic granules inside the inclined pipe 5 to be discharged through the connecting pipe 16, the three-way valve 14, and the discharge pipe 15. When conveying the waste plastic granules after dust removal is required, the impeller 610 is rotated counterclockwise, generating an upward airflow in the inclined pipe 5. Simultaneously, the three-way valve 14 is controlled to disconnect the air passage of the connecting pipe 16 from the air passage of the discharge pipe 15, while connecting the connecting pipe 16 to the air passage of the connecting pipe 13. This allows the hot air in the inner cavity of the packaging box 10 to enter the inner cavity of the inclined pipe 5 through the connecting pipe 13, the three-way valve 14, and the connecting pipe 16, thus achieving the conveying and preheating of the plastic granules.

[0042] An air outlet cover 611 is fixedly installed at the top opening of the vent frame 67. Several annularly distributed air jets 612 penetrate the upper surface of the air outlet cover 611. These air jets 612 are inclined. A screen frame 613 is fixedly installed on the upper surface of the air outlet cover 611, and an agitator plate 614 is fixedly installed on the upper surface of the screen frame 613. A sealing ring 615 is fixedly installed on the inner wall of the inclined pipe 5. The screen frame 613 and the inner wall of the sealing ring 615 are rubbed together. The feed inlet 17 is located above the screen frame 613. By setting the air outlet cover 611, the airflow generated by the impeller 610 is collected and ejected from the air jets 612, blowing the plastic particles on the screen frame 613. By setting the air jets 612, which are annularly distributed on the upper surface of the air outlet cover 611 and inclined, the airflow is ejected at an inclined angle to form a rotating air curtain, which sweeps the waste plastic particles from all directions, allowing the dust-removed plastic particles to be blown into the inner cavity of the granulator 3. By setting a screen frame 613 and fixing it to the upper surface of the air outlet cover 611, waste plastic particles are blocked, preventing them from falling onto the upper surface of the air outlet cover 611. This allows dust particles to fall onto the surface of the air outlet cover 611, where they are then absorbed when suction is generated by the air jet nozzle 612. By setting a stirring plate 614, which rotates with the screen frame 613, the plastic particles on the upper surface of the screen frame 613 are agitated, preventing particle accumulation and clogging of the screen. By setting a sealing ring 615 and fixing it to the inner wall of the inclined tube 5, it frictionally adapts to the outer wall of the screen frame 613, forming a dynamic seal when the screen frame 613 rotates, preventing particles from leaking from the gap between the screen frame 613 and the inner wall of the inclined tube 5.

[0043] like Figures 9-10 As shown, the waste plastic recycling granulation equipment also includes a switching mechanism 7, which is used to switch the flow direction of the waste plastic. By setting the switching mechanism 7, when the feeding mechanism 6 is removing dust from the waste plastic granules, it can switch to dust removal mode, thereby allowing outside air to enter and carry out the dust in the waste plastic granules with the airflow. At the same time, when the feeding mechanism 6 is conveying the waste plastic granules, it can switch to conveying mode, connecting the feeding mechanism 6 with the inner cavity of the granulator 3, realizing the switching control of the two modes of dust removal and conveying.

[0044] The switching mechanism 7 includes a second stepper motor 71, which is fixed to the outer surface of the bracket 4 via a second connecting frame. A rotating rod 72 is mounted on the output end of the second stepper motor 71 via a coupling. An opening is formed on the lower surface of the inclined tube 5. A sealing plate 73 is fixed to the outer surface of the rotating rod 72, adapting to the opening on the lower surface of the inclined tube 5. A limiting frame 76 is fitted onto the outer surface of the rotating rod 72, with its end fixed to the inner wall of the inclined tube 5. By setting the second stepper motor 71 as the rotational drive source of the switching mechanism 7, its speed and direction are precisely controllable, enabling precise control of the rotation angle of the sealing plate 73. By setting the rotating rod 72, the rotational torque of the second stepper motor 71 is transmitted to the sealing plate 73, driving the sealing plate 73 to rotate relative to the inclined tube 5. By setting the sealing plate 73, fixed to the outer surface of the rotating rod 72 and adapted to the opening on the lower surface of the inclined tube 5, the opening and closing of the bottom opening of the inclined tube 5 is controlled by rotating the sealing plate 73. By setting a limiting bracket 76, which is fixed to the inner wall of the inclined tube 5 and sleeved on the outer surface of the rotating rod 72, the rotation of the rotating rod 72 is provided with auxiliary support and limitation, preventing the rotating rod 72 from deflecting during rotation and ensuring the rotation accuracy of the sealing plate 73.

[0045] The switching mechanism 7 also includes an inverted funnel 78, which is fixed in the middle of the inner cavity of the inclined tube 5. A spring hose 77 is fixed at the opening of the inverted funnel 78, and a connecting cylinder 74 is fixed at the end of the spring hose 77 away from the inverted funnel 78. The connecting cylinder 74 is fixed on the surface of the sealing plate 73. By setting up the inverted funnel 78, the plastic granules after dust removal and screening are collected and guided to the spring hose 77, preventing the granules from scattering and accumulating in the inner cavity of the inclined tube 5, and ensuring centralized material conveying. By setting up the spring hose 77, the inverted funnel 78 and the connecting cylinder 74 are connected. When the sealing plate 73 rotates, it can expand and contract with the movement of the sealing plate 73, maintaining the continuity of the material conveying channel. By setting up the connecting cylinder 74, the spring hose 77 is connected to the feed ring 9, serving as a transition channel for material to enter the granulator 3 from the inclined tube 5. When the sealing plate 73 rotates to separate from the opening of the inclined tube 5, the connecting cylinder 74 guides the material into the granulator 3.

[0046] An air inlet box 79 is fixedly installed at the top of the inner wall of the inclined pipe 5. A screen 710 is fixedly installed on the inner wall of the air inlet box 79. A rubber ring 75 is fixedly installed at the end of the connecting cylinder 74 away from the spring hose 77. When the sealing plate 73 contacts the opening of the inclined pipe 5, the rubber ring 75 is squeezed and fitted with the air inlet box 79. By setting the air inlet box 79, a mounting base for the screen 710 is provided, and it also serves as a buffer cavity for airflow. By setting the screen 710 and fixing it to the inner wall of the air inlet box 79, the airflow entering the inner cavity of the inclined pipe 5 is filtered, preventing external dust from entering the inclined pipe 5 with the airflow. By setting the rubber ring 75, when the sealing plate 73 rotates to contact the opening of the inclined pipe 5, the rubber ring 75 is squeezed and sealed with the air inlet box 79, ensuring the stability of the dust removal airflow.

[0047] A feed pipe 8 runs through the hopper of the granulator 3. A feed ring 9 is fixed at the top of the feed pipe 8. When the angle between the sealing plate 73 and the inclined pipe 5 is 90°, the rubber ring 75 and the feed ring 9 are squeezed together. By setting the feed pipe 8 to run through the hopper of the granulator 3, the plastic granules in the inner cavity of the inclined pipe 5 are guided to the hopper of the granulator 3, serving as a channel for material to enter the granulator 3. By setting the feed ring 9 to cooperate with the rubber ring 75 at the end of the connecting cylinder 74, when the sealing plate 73 rotates to an angle of 90° with the inclined pipe 5, the rubber ring 75 and the feed ring 9 are squeezed together, ensuring that the material smoothly enters the granulator 3 from the inclined pipe 5 through the connecting cylinder 74 and the feed pipe 8. At the same time, there is a certain gap between the rubber ring 75 and the feed ring 9, which allows airflow to be discharged through the gap while allowing the plastic granules to flow into the inner cavity of the feed pipe 8.

[0048] Working principle: When the equipment is working, waste plastic granules are fed into the inclined pipe 5 through the feed inlet 17, and the granules fall onto the upper surface of the screen frame 613. The first stepper motor 62 starts, driving the rotating frame 68 to rotate through the drive wheel 63 and belt 64. The rotating frame 68 rotates synchronously through the connecting column 69, driving the vent frame 67 and the screen frame 613 to rotate synchronously. The stirring plate 614 agitates the granules to prevent them from accumulating and clogging the screen.

[0049] When the dust removal mode is activated, the first stepper motor 62 drives the impeller 610 to rotate clockwise, generating a downward airflow that creates negative pressure inside the inclined pipe 5. At this time, the second stepper motor 71 of the switching mechanism 7 drives the sealing plate 73 to rotate until it contacts and closes with the opening of the inclined pipe 5. The rubber ring 75 on the surface of the sealing plate 73 is pressed and sealed against the air inlet box 79. Simultaneously, the three-way valve 14 switches to connect the connecting pipe 16 and the discharge pipe 15, cutting off the air path between the connecting pipe 13 and the connecting pipe 16. The screen frame 613 blocks the plastic particles on its upper surface. Dust passes through the screen frame 613 and is sucked into the vent frame 67 through the air outlet 612 of the air outlet cover 611. Then, it is discharged from the discharge pipe 15 through the impeller 610, the rotating frame 68, the connecting pipe 16, and the three-way valve 14, thus achieving the separation of particles and dust.

[0050] When switching to feeding mode, the second stepper motor 71 drives the sealing plate 73 to rotate to a 90° angle with the inclined tube 5. The sealing plate 73 opens the bottom opening of the inclined tube 5, and the rubber ring 75 and the feed ring 9 are pressed together to form a seal. The connecting cylinder 74 connects the inner cavity of the inclined tube 5 with the feed pipe 8. At the same time, the first stepper motor 62 drives the impeller 610 to rotate counterclockwise, generating a hot airflow from bottom to top in the inner cavity of the inclined tube 5. The three-way valve 14 switches to connect the connecting pipe 16 with the connecting pipe 13, and the discharge pipe 15 is cut off. While the heating coil 11 is energized to heat the granulator 3, it also heats the air inside the packaging box 10. The hot air enters the inner cavity of the inclined tube 5 through the connecting pipe 13, the three-way valve 14, and the connecting pipe 16. Hot air is ejected through the inclined jet nozzle 612 of the air outlet cover 611, forming a rotating air curtain that blows up the dust-removed plastic granules on the screen frame 613. These granules are then carried upwards along the 45° inclined pipe 5 by the hot airflow, collected through the inverted funnel 78, spring hose 77, connecting cylinder 74, and feed pipe 8, entering the hopper of the granulator 3. This simultaneous conveying and preheating is achieved. The gap between the rubber ring 75 and the feed ring 9 allows the hot airflow to escape while the granules flow smoothly into the feed pipe 8. The granulator 3 then extrudes the heated and molten plastic into granules, completing the recycling of waste plastic.

[0051] Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A granulation device for recycling waste plastics, comprising a base frame (1) and a granulator (3), and a frame (2) fixed to the lower surface of the granulator (3), wherein the frame (2) is fixed to the upper surface of the base frame (1), characterized in that, Also includes: Feeding mechanism (6) is used to remove dust from waste plastic granules and feed them into the inner cavity of the granulator (3); A switching mechanism (7) is used to switch the flow direction of waste plastics; The upper surface of the base frame (1) is fixed with a bracket (4), the top of the bracket (4) is fixed with an inclined tube (5), the feeding mechanism (6) is located in the inner cavity of the inclined tube (5), the switching mechanism (7) is located on the lower surface of the inclined tube (5), and the upper surface of the inclined tube (5) is connected by a feed inlet (17). The granulator (3) has a packaging box (10) fixed on its upper surface. A heating coil (11) is provided in the inner cavity of the packaging box (10). A transformer (12) is fixed on the outer surface of the packaging box (10). The transformer (12) is connected to the heating coil (11).

2. The granulation equipment for recycling waste plastics according to claim 1, characterized in that: The feeding mechanism (6) includes a first connecting frame (61) and a fixed cylinder (65). The first connecting frame (61) is fixed on the outer surface of the inclined tube (5). The fixed cylinder (65) is fixed at the bottom end of the inclined tube (5). A venting frame (67) is rotatably connected to the inner wall of the fixed cylinder (65) via a rolling bearing (66). A connecting column (69) is fixed on the lower surface of the venting frame (67). A rotating frame (68) is fixed at the end of the connecting column (69) away from the venting frame (67). The rotating frame (68) is rotatably connected to the bottom end of the fixed cylinder (65).

3. The granulation equipment for recycling waste plastics according to claim 2, characterized in that: An impeller (610) is fixed to the inner wall of the vent frame (67), and a first stepper motor (62) is fixed to the inner wall of the first connecting frame (61). The output end of the first stepper motor (62) is equipped with a drive wheel (63) through a coupling. The drive wheel (63) is connected to the rotating frame (68) through a belt (64).

4. The granulation equipment for recycling waste plastics according to claim 3, characterized in that: A connecting pipe (13) runs through the upper surface of the package box (10). A three-way valve (14) is fixed at the end of the connecting pipe (13). A discharge pipe (15) is fixed at one end of the three-way valve (14). A connecting pipe (16) is fixed at the top of the three-way valve (14). The end of the connecting pipe (16) away from the three-way valve (14) is rotatably connected to the inner cavity of the rotating frame (68).

5. The granulation equipment for recycling waste plastics according to claim 4, characterized in that: An air outlet cover (611) is fixedly provided at the top opening of the vent frame (67). Several annularly distributed air jets (612) are penetrating the upper surface of the air outlet cover (611). The air jets (612) are inclined. A screen frame (613) is fixedly provided on the upper surface of the air outlet cover (611). An agitator plate (614) is fixedly provided on the upper surface of the screen frame (613). A sealing ring (615) is fixedly provided on the inner wall of the inclined tube (5). The screen frame (613) and the inner wall of the sealing ring (615) are rubbed and adapted. The feed inlet (17) is located above the screen frame (613).

6. The granulation equipment for recycling waste plastics according to claim 1, characterized in that: The switching mechanism (7) includes a second stepper motor (71), which is fixed on the outer surface of the bracket (4) via a second connecting frame. The output end of the second stepper motor (71) is equipped with a rotating rod (72) via a coupling. The lower surface of the inclined tube (5) has an opening. The outer surface of the rotating rod (72) is fixed with a sealing plate (73), which is adapted to the opening on the lower surface of the inclined tube (5). The outer surface of the rotating rod (72) is fitted with a limiting frame (76), the end of which is fixed to the inner wall of the inclined tube (5).

7. The granulation equipment for recycling waste plastics according to claim 6, characterized in that: The switching mechanism (7) also includes an inverted funnel (78), which is fixed in the middle of the inner cavity of the inclined tube (5). A spring hose (77) is fixed at the opening of the inverted funnel (78), and a connecting tube (74) is fixed at one end of the spring hose (77) away from the inverted funnel (78). The connecting tube (74) is fixed on the surface of the sealing plate (73).

8. The granulation equipment for recycling waste plastics according to claim 7, characterized in that: An air inlet box (79) is fixedly provided at the top of the inner wall of the inclined tube (5). A screen (710) is fixedly provided at the inner wall of the air inlet box (79). A rubber ring (75) is fixedly provided at the end of the connecting cylinder (74) away from the spring hose (77). When the sealing plate (73) comes into contact with the opening of the inclined tube (5), the rubber ring (75) is squeezed and fitted with the air inlet box (79).

9. A granulation device for recycling waste plastics according to claim 8, characterized in that: The granulator (3) has a feed pipe (8) running through its hopper. The top of the feed pipe (8) is fixed with a feed ring (9). When the angle between the sealing plate (73) and the inclined pipe (5) is 90°, the rubber ring (75) and the feed ring (9) are squeezed and matched.

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