Particle screening and recycling equipment of plastic waste granulator

Abstract

The invention discloses particle screening and recycling equipment of a plastic waste pelletizer, and belongs to the technical field of plastic recycling and processing.The particle screening and recycling equipment comprises a mounting frame, a sorting mechanism is arranged at the top end of the mounting frame and comprises a screening box fixedly mounted at the top end of the mounting frame, and a screening assembly is arranged in the screening box; the screening assembly comprises a screen obliquely installed in the screening box, a magnetic separation assembly is arranged on the surface, close to the screen, of the screening box, and the magnetic separation assembly comprises an electrostatic adsorption plate arranged at the top end of the screen. According to the device, by matching with a cylinder structure composed of an electrostatic adsorption plate and a rubber plate, accurate linkage of triboelectrification and electrostatic adsorption is achieved, then by matching with the temperature control effect of a water cooling pipe and a heat absorption rod and adsorption assistance of an activated carbon layer, the problems that existing equipment is insufficient in triboelectrification, rapid in electrostatic attenuation and too high in friction heat generation are effectively solved, and efficient recovery is achieved.

Description

Technical Field

[0001] This invention relates to the field of plastic recycling and processing technology, and in particular to a plastic waste granulator pellet screening and recycling equipment. Background Technology

[0002] With the rapid development of the plastics industry, plastic products are increasingly widely used in production, daily life, and industry. Consequently, the amount of waste plastics generated is also increasing year by year, causing not only serious resource waste but also posing a significant threat to the ecological environment. The recycling of plastic waste has become an important way to solve resource shortages and environmental pollution problems. Among these technologies, plastic waste granulation and recycling technology is widely used in the waste plastics processing industry because it can transform waste plastics into reusable plastic granules, achieving resource recycling. However, existing screening and recycling equipment does not effectively combine magnetic separation and electrostatic separation. Most equipment only uses a single magnetic separation or electrostatic adsorption method to remove metal impurities. This not only fails to thoroughly adsorb ferromagnetic metals but also struggles to effectively handle non-ferromagnetic metal impurities. Furthermore, the charge generation stability of electrostatic adsorption is poor, often relying on a single frictional charging method, which easily leads to excessive frictional heat and decreased electrostatic adsorption efficiency, resulting in residual metal impurities and affecting the quality of recycled plastic granules. Summary of the Invention

[0003] The purpose of this invention is to provide a plastic waste granulator granulation and recycling equipment to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a plastic waste granulator granulation and recycling equipment, comprising a mounting frame, a sorting mechanism at the top of the mounting frame, a screening box fixedly mounted at the top of the mounting frame, a screening assembly inside the screening box, a screen screen installed at an angle inside the screening box, a magnetic separation assembly near the screen screen, an electrostatic adsorption plate at the top of the screen screen, the electrostatic adsorption plate being fixedly mounted on the inner wall of the screening box via a support frame, a rubber plate on one side of the electrostatic adsorption plate, and the rubber plate and the electrostatic adsorption plate forming a cylinder, a second motor fixedly mounted on the outer surface of the screening box, a fixed rod fixedly mounted on the output shaft of the second motor, a scraper fixedly mounted on the outer surface of the fixed rod, the scraper sliding on the outer surface of the cylinder, friction patterns fixedly mounted on the outer surface of the fixed rod, and multiple friction components on the inner wall of the screening box, the friction components including multiple friction rollers installed inside the cylinder for generating static electricity through friction with the friction patterns.

[0005] As a preferred embodiment of the present invention, the outer surface of the friction roller is provided with a plurality of inverted conical pits for preventing particles from slipping on the surface, and the outer surface of the friction roller is coated with an aluminum titanate conductive ceramic coating. The inner wall of the friction roller is provided with a fixing layer, and the fixing layer is made of quartz glass core rod material.

[0006] As a preferred embodiment of the present invention, the outer surface of the friction roller is provided with a plurality of air holes, the interior of the friction roller is filled with an activated carbon layer and the activated carbon layer is connected to the air holes, a water cooling pipe is provided at the center of the friction roller, the end of the water cooling pipe is connected to an external circulating water system through a rotary joint, and a plurality of heat-absorbing rods are provided between the water cooling pipe and the activated carbon layer.

[0007] As a preferred embodiment of the present invention, the outer surface of the screening box is provided with an air separation component, the air separation component includes a fan fixedly installed on the outer surface of the screening box, the input end of the fan is connected to a suction component, the suction component includes a recycling pipe head disposed near the inner wall of the rubber plate of the screening box, the output end of the fan is connected to a discharge hopper for discharging the selected waste material, and the input end of the fan is connected to a dust suction plate, which is located on one side of the waste plastic feed end.

[0008] As a preferred embodiment of the present invention, the screening box is fixedly installed with multiple air nozzles for vibrating the screen inside the bottom end of the screen. The air nozzles and the output end of the blower are connected and installed through a connecting pipe, and an intermittent solenoid valve is provided on the connecting pipe. The end of the screening box near the screen is connected and installed with a discharge plate.

[0009] As a preferred embodiment of the present invention, a recycling mechanism is provided near the top of the screening box on the mounting frame. The recycling mechanism includes a collection box fixedly installed on the top of the mounting frame. The collection box is connected to the screening box. A discharge pipe is fixedly installed inside the collection box. A groove is formed inside the collection box near the discharge pipe. A through hole communicating with the groove is formed on the surface of the discharge pipe. A heat-conducting rod is rotatably installed inside the discharge pipe. An agitator for low-damage conveying of plastic granules is fixedly installed on the outer surface of the heat-conducting rod. A baffle for closing the groove is fixedly installed on the outer surface of the agitator. A third motor is fixedly installed at the top of the mounting frame. The output shaft of the third motor is fixedly connected to the heat-conducting rod.

[0010] As a preferred embodiment of the present invention, a heating box is fixedly installed at the top of the mounting frame, the output end of the heating box is connected to one end of the heat-conducting rod, and the discharge pipe is connected to the input end of the blower through an auxiliary air pipe. A sealing groove for sealing the heat flow is provided between the screening box and the collection box.

[0011] As a preferred embodiment of the present invention, a crushing mechanism is provided at the top of the mounting frame. The crushing mechanism includes a feeding box fixedly installed at the top of the mounting frame. The inside of the feeding box is provided with a plurality of crushing rollers for crushing waste plastics. A first motor is fixedly installed on the outer surface of the feeding box, and the output shaft of the first motor is fixedly connected to one end of the crushing roller.

[0012] As a preferred embodiment of the present invention, the bottom end of the crushing mechanism is provided with a conveying mechanism, the conveying mechanism includes a conveying box fixedly installed on the top of the mounting frame, a plurality of drive shafts are rotatably installed inside the conveying box, and a conveyor belt for conveying the crushed waste plastic particles to the inside of the screening box is installed between the plurality of drive shafts, and a first belt is provided between one of the drive shafts and the output shaft of the first motor.

[0013] As a preferred embodiment of the present invention, a rotating shaft is rotatably installed between the conveyor belt and the screening box, and a plurality of rotating plates for quantitative discharge are fixedly installed on the outer surface of the rotating shaft. A second belt is driven between the rotating shaft and the transmission shaft.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. This invention utilizes the friction texture on the outer surface of the fixed rod and the friction roller of the friction component to generate electricity through mutual friction. Combined with the cylindrical structure composed of an electrostatic adsorption plate and a rubber plate, it achieves precise linkage between friction generation and electrostatic adsorption. The inverted conical pits on the outer surface of the friction roller prevent plastic particles from slipping, the aluminum titanate conductive ceramic coating enhances charge conduction, and the internal quartz glass core rod fixing layer reduces charge leakage. With the temperature control effect of the water cooling pipe and the heat absorption rod, as well as the adsorption assistance of the activated carbon layer, it effectively solves the problems of insufficient friction generation, rapid static electricity decay, and excessive frictional heat generation in existing equipment. This allows for more thorough adsorption of metallic impurities (including ferromagnetic and non-ferromagnetic ones), significantly improving the quality of recycled plastic particles.

[0016] 2. This invention employs an inclined screen, which works in conjunction with the fan and air nozzle of the air separation component to form a linkage. The output end of the fan is connected to the air nozzle at the bottom of the screen through a connecting pipe. With the help of an intermittent solenoid valve, the screen vibrates intermittently, effectively preventing screen blockage and solving the defects of existing screens such as insufficient screening and easy material jamming. At the same time, the scraper removes the impurities adsorbed on the surface of the electrostatic adsorption plate by rotating. When the scraper reaches the surface of the rubber plate, the dust suction plate can adsorb the dust and impurities that fall from the surface of the rubber plate. The material suction component accurately recovers the light waste material in the screening process, greatly improving the screening accuracy and efficiency.

[0017] 3. The conveying mechanism of the present invention is linked to the first motor via the first belt, and the rotating shaft is linked to the transmission shaft via the second belt, which drives the rotating plate to realize the quantitative discharge of crushed plastic particles, avoids the impact of uneven feeding on the screening effect, shares the power transmission structure, reduces power loss, realizes continuous and automated operation, reduces the rate of manual intervention, and improves the overall operating efficiency of the equipment.

[0018] 4. This invention incorporates a heat-conducting rod and an agitator inside the discharge pipe. The agitator enables low-damage conveying of the plastic granules, preventing breakage and scratches, and ensuring the physical properties of the granules. Furthermore, the heating box is connected to the heat-conducting rod, allowing for heating and drying of the plastic granules during the conveying process. Combined with the linkage of the auxiliary air pipe and the fan, as well as the sealing effect of the sealing groove, this reduces moisture absorption by the granules. Simultaneously, the activated carbon layer and pores adsorb trace impurities on the granule surface, precisely matching the feeding requirements of subsequent granulation equipment and further improving the quality of the granulated product.

[0019] 5. This invention integrates functions such as crushing, conveying, screening, electrostatic adsorption, air separation, recycling, and drying into one unit. Compared with existing loose equipment, it significantly reduces the floor space. Moreover, the modular design of each component reduces the number of power components and energy consumption through multi-mechanism linkage. At the same time, automated operation reduces manual input, effectively controls equipment operating costs, and is suitable for the needs of small and medium-sized plastic applications. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a side view of the structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the internal structure of the conveyor box of the present invention;

[0023] Figure 4 This is a schematic diagram of the internal structure of the screening box of the present invention;

[0024] Figure 5 This is a schematic diagram of the electrostatic adsorption plate structure of the present invention;

[0025] Figure 6 This is a schematic diagram of the cross-sectional structure of the friction roller of the present invention;

[0026] Figure 7 This is a schematic diagram of the screen structure of the present invention;

[0027] Figure 8 This is a schematic diagram of the internal structure of the discharge pipe of the present invention.

[0028] In the diagram: 1. Mounting frame; 2. Crushing mechanism; 21. First motor; 22. Crushing roller; 23. Feed box; 3. Conveying mechanism; 31. First belt; 32. Drive shaft; 33. Conveyor belt; 34. Conveying box; 35. Second belt; 36. Rotating shaft; 37. Rotating plate; 4. Sorting mechanism; 41. Screening box; 42. Magnetic separation assembly; 421. Second motor; 422. Fixing rod; 423. Friction component; 4231. Friction roller; 4232. Dent; 4233. Pore; 4234. Fixing layer; 4235. Activated carbon layer; 4236. Water cooling pipe; 4237. 424. Heat absorber; 425. Friction texture; 426. Rubber sheet; 427. Electrostatic adsorption plate; 428. Scraper; 429. Support frame; 43. Air separation component; 431. Dust suction plate; 432. Material suction component; 433. Fan; 434. Discharge hopper; 44. Screening component; 441. Connecting pipe; 442. Discharge plate; 443. Screen; 444. Air outlet nozzle; 5. Recycling mechanism; 51. Discharge pipe; 52. Collection box; 53. Groove; 54. Sealing groove; 55. Auxiliary air pipe; 56. Agitator wheel; 57. Heat-conducting rod; 58. Baffle; 59. Third motor; 6. Heating box. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see Figure 1-8This invention provides a plastic waste granulator pellet screening and recycling device, including a mounting frame 1. A sorting mechanism 4 is provided at the top of the mounting frame 1. The sorting mechanism 4 includes a screening box 41 fixedly installed at the top of the mounting frame 1. A screening assembly 44 is provided inside the screening box 41. The screening assembly 44 includes a screen 443 inclinedly installed inside the screening box 41. A magnetic separation assembly 42 is provided on the surface of the screening box 41 near the screen 443. The magnetic separation assembly 42 includes an electrostatic adsorption plate 426 disposed at the top of the screen 443. The electrostatic adsorption plate 426 is fixedly installed on the inner wall of the screening box 41 by a support frame 428. A rubber plate 425 is provided on one side of the screening box 426, and the rubber plate 425 and the electrostatic adsorption plate 426 form a cylinder. A second motor 421 is fixedly installed on the outer surface of the screening box 41. A fixed rod 422 is fixedly installed on the output shaft of the second motor 421. A scraper 427 is fixedly installed on the outer surface of the fixed rod 422, and the scraper 427 slides on the outer surface of the cylinder. Friction texture 424 is fixedly installed on the outer surface of the fixed rod 422. A plurality of friction components 423 are provided on the inner wall of the screening box 41. The friction components 423 include a plurality of friction rollers 4231 installed inside the cylinder for generating static electricity by rubbing against the friction texture 424.

[0031] In the process of sorting plastic granules, the granules are first conveyed to the surface of screen 443. Since screen 443 is installed at an angle, the plastic granules slide and are screened under their own gravity, achieving preliminary separation of granules of different sizes. The second motor 421 drives the fixed rod 422 to rotate. The friction texture 424 on the fixed rod 422 rubs against the friction roller 4231 on the inner wall of the screening box 41 to generate static electricity. The static electricity is conducted to the electrostatic adsorption plate 426 to achieve electrostatic adsorption of metal impurities in the plastic granules. The cooperation of multiple friction rollers 4231 and friction texture 424 increases the friction contact area, improves the static electricity generation efficiency, and ensures more complete adsorption of metal impurities. At the same time, the rotation of the fixed rod 422 drives the scraper 427 to slide on the outer surface of the cylinder. When it scrapes the surface of the rubber plate 425, it can promptly remove the impurities attached to the adsorption plate, avoid the adsorption plate from clogging and the reduction of electrostatic adsorption efficiency, and ensure the continuous and stable operation of electrostatic adsorption.

[0032] The electrostatic adsorption plate 426 is covered with a polytetrafluoroethylene film, and the friction texture 424 is made of nylon material. By utilizing the polarity difference between nylon and polytetrafluoroethylene in the triboelectric sequence, the electrostatic adsorption plate 426 is negatively charged and the friction texture 424 is positively charged, thereby enabling the directional adsorption and separation of positively charged plastic particles and negatively charged impurities.

[0033] In some embodiments, the outer surface of the friction roller 4231 is provided with a plurality of inverted conical pits 4232 for preventing particles from slipping on the surface, and the outer surface of the friction roller 4231 is coated with an aluminum titanate conductive ceramic coating. The inner wall of the friction roller 4231 is provided with a fixing layer 4234, and the fixing layer 4234 is made of quartz glass core rod material.

[0034] Specifically, an inverted conical recess 4232 is formed on the outer surface of the friction roller 4231. The "grabbing" effect of the recess 4232 increases the contact friction between the plastic particles and the surface of the friction roller 4231, preventing the particles from slipping on the surface of the friction roller 4231. This ensures the stability of the triboelectric charging process between the friction texture 424 and the friction roller 4231, while also ensuring sufficient contact between the plastic particles and the friction roller 4231, thus improving the uniformity of the particles' own charge. The silicon carbide coating on the outer surface of the friction roller 4231 enhances the charge conduction efficiency and reduces the accumulation and leakage of charge on the surface of the friction roller 4231. The quartz glass core rod fixing layer 4234 on the inner wall, with its high insulation, further reduces charge leakage and provides stable support for the internal structure of the friction roller 4231, thereby improving the overall structural strength of the friction roller 4231.

[0035] In some embodiments, the outer surface of the friction roller 4231 is provided with a plurality of air holes 4233, the interior of the friction roller 4231 is filled with an activated carbon layer 4235, and the activated carbon layer 4235 communicates with the air holes 4233. A water cooling pipe 4236 is provided at the center of the friction roller 4231, the end of the water cooling pipe 4236 is connected to an external circulating water system through a rotary joint, and a plurality of heat-absorbing rods 4237 are provided between the water cooling pipe 4236 and the activated carbon layer 4235.

[0036] During the operation of the friction roller 4231, the adsorption properties of activated carbon are utilized to adsorb trace amounts of dust, moisture, and fine impurities on the surface of the plastic particles through the pores 4233, thus achieving auxiliary cleaning of the particles. The two ends of the water cooling pipe 4236 extend to the outside of the friction roller 4231 and are connected to the coolant circulation pump through a rotary joint. At this time, the water cooling pipe 4236, together with the heat absorber 4237, can quickly absorb the heat generated by the friction roller 4231 during the friction electrification process, and conduct the heat out through the cooling water circulation, thereby achieving temperature control of the friction roller 4231, avoiding excessive frictional heat generation that could lead to material aging of the friction roller 4231 and accelerated charge leakage, while also preventing high temperature damage to the plastic particles.

[0037] In some embodiments, an air separation component 43 is provided on the outer surface of the screening box 41. The air separation component 43 includes a fan 433 fixedly installed on the outer surface of the screening box 41. A suction component 432 is connected to the input end of the fan 433. The suction component 432 includes a recycling pipe head provided on the inner wall of the screening box 41 near the rubber plate 425. A discharge hopper 434 for discharging the selected waste material is connected to the output end of the fan 433. A dust suction plate 431 is connected to the input end of the fan 433 and is located on one side of the waste plastic feed end.

[0038] The blower 433 generates negative pressure during operation, and the dust collection plate 431 at the feed end uses the negative pressure to adsorb the dust and impurities carried by the waste plastic during feeding, realizing "pre-dust collection" and reducing the interference of dust on subsequent screening and electrostatic adsorption. The recycling pipe head inside the screening box 41 uses the negative pressure of the blower 433 to adsorb the light waste separated during the screening process, and discharges the light waste through the discharge hopper 434, realizing the separation of plastic particles and light impurities. At the same time, it provides the airflow basis for the vibration of the subsequent screen 443, realizing the coordinated linkage of air separation and screening.

[0039] In some embodiments, a plurality of air nozzles 444 for vibrating the screen 443 are fixedly installed inside the screening box 41 at the bottom end of the screen 443. The air nozzles 444 and the output end of the blower 433 are connected and installed through a connecting pipe 441, and an intermittent solenoid valve is provided on the connecting pipe 441. A discharge plate 442 is connected and installed at one end of the screening box 41 near the screen 443.

[0040] When the solenoid valve on the connecting pipe 441 is opened, the airflow generated by the blower 433 is ejected through the air outlet nozzle 444, which generates an intermittent impact force on the inclined screen 443, causing the screen 443 to vibrate and shake off the particles clogging the surface of the screen 443, thus preventing the screen 443 from becoming clogged. The qualified particles after screening slide through the inclined screen 443 to the discharge plate 442, realizing the initial discharge of qualified particles. The screening box 41 is equipped with a wind pressure sensor for monitoring the permeability of the screen 443. The intermittent solenoid valve is electrically connected to the wind pressure sensor. When the wind pressure value is lower than the preset threshold, the solenoid valve is triggered to open and perform high-frequency pulse jet vibration.

[0041] In some embodiments, a recycling mechanism 5 is provided on the top of the mounting frame 1 near the top of the screening box 41. The recycling mechanism 5 includes a collection box 52 fixedly installed on the top of the mounting frame 1. The collection box 52 is connected to the screening box 41. A discharge pipe 51 is fixedly installed inside the collection box 52. A groove 53 is opened inside the collection box 52 near the discharge pipe 51. A through hole communicating with the groove 53 is opened on the surface of the discharge pipe 51. A heat-conducting rod 57 is rotatably installed inside the discharge pipe 51. An agitator 56 for low-damage conveying of plastic particles is fixedly installed on the outer surface of the heat-conducting rod 57. A baffle 58 for closing the groove 53 is fixedly installed on the outer surface of the agitator 56. A third motor 59 is fixedly installed on the top of the mounting frame 1. The output shaft of the third motor 59 is fixedly connected to the heat-conducting rod 57.

[0042] The third motor 59 drives the heat-conducting rod 57 to rotate, and the agitator 56 on the heat-conducting rod 57 rotates accordingly. The rotation of the agitator 56 pushes the plastic granules to achieve low-damage conveying, avoiding granule breakage and scratches. At the same time, the baffle 58 on the agitator 56 cooperates with the groove 53 of the collection box 52 and the through hole of the discharge pipe 51. During the rotation, the baffle 58 can seal the groove 53 and the through hole to prevent granules from leaking during the conveying process, achieve homogeneous granule pushing, and ensure uniform discharge.

[0043] In some embodiments, a heating box 6 is fixedly installed at the top of the mounting frame 1. The output end of the heating box 6 is connected to one end of the heat-conducting rod 57, and the discharge pipe 51 is connected to the input end of the blower 433 through the auxiliary air pipe 55. A sealing groove 54 for sealing the heat flow is provided between the screening box 41 and the collection box 52.

[0044] The heating chamber 6 generates hot air or hot oil which is then introduced into the heat-conducting rod 57. The heat-conducting rod 57 transfers heat to the stirring wheel 56, heating and drying the plastic granules during the granule conveying process. This removes trace amounts of moisture from the granule surface, preventing granules from sticking together or affecting subsequent granulation quality. The discharge pipe 51 is connected to the input end of the blower 433 via the auxiliary air pipe 55, which can draw in the moisture and trace amounts of dust generated during the drying process, achieving synergistic drying and dust removal. The sealing groove 54 between the screening box 41 and the collection box 52 is used to seal the heat flow, prevent heat leakage, and improve drying efficiency.

[0045] In some embodiments, a crushing mechanism 2 is provided at the top of the mounting frame 1. The crushing mechanism 2 includes a feed box 23 fixedly installed at the top of the mounting frame 1. The feed box 23 is provided with a plurality of crushing rollers 22 for crushing waste plastics. A first motor 21 is fixedly installed on the outer surface of the feed box 23. The output shaft of the first motor 21 is fixedly connected to one end of the crushing rollers 22.

[0046] The first motor 21 drives the crushing roller 22 to rotate. Multiple crushing rollers 22 cooperate with each other to squeeze and shear the input waste plastic, crushing large pieces of waste plastic into uniform plastic particles. The crushed particles fall into the conveying mechanism 3 below, providing a qualified raw material base for subsequent screening and recycling.

[0047] In some embodiments, a conveying mechanism 3 is provided at the bottom of the crushing mechanism 2. The conveying mechanism 3 includes a conveying box 34 fixedly installed at the top of the mounting frame 1. Multiple drive shafts 32 are rotatably installed inside the conveying box 34. A conveyor belt 33 for conveying the crushed waste plastic particles to the inside of the screening box 41 is installed between the multiple drive shafts 32. A first belt 31 is provided between one of the drive shafts 32 and the output shaft of the first motor 21.

[0048] The output shaft of the first motor 21 is linked to one of the transmission shafts 32 via the first belt 31, which drives the transmission shaft 32 to rotate. Multiple transmission shafts 32 work together to drive the conveyor belt 33 to run. The conveyor belt 33 smoothly conveys the plastic particles crushed by the crushing mechanism 2 to the inside of the screening box 41, realizing the precise connection between the crushing and screening stages, improving the overall operating efficiency of the equipment, and providing high-quality raw materials for subsequent screening and electrostatic adsorption.

[0049] In some embodiments, a rotating shaft 36 is rotatably mounted between the conveyor belt 33 and the screening box 41, and a plurality of rotating plates 37 for quantitative discharge are fixedly mounted on the outer surface of the rotating shaft 36. A second belt 35 is driven between the rotating shaft 36 and the drive shaft 32.

[0050] The drive shaft 32 is linked to the rotating shaft 36 via the second belt 35, causing the rotating shaft 36 to rotate. Multiple rotating plates 37 on the rotating shaft 36 rotate accordingly, forming independent receiving spaces between the rotating plates 37. When the plastic granules conveyed by the conveyor belt 33 fall between the rotating plates 37, the rotating plates 37 rotate to quantitatively push the granules into the screening box 41, realizing the quantitative export of plastic granules. This ensures that the amount of granules entering the screening box 41 is uniform and stable, adapting to subsequent screening and electrostatic adsorption processes. It avoids problems such as material jamming and insufficient screening caused by a large influx of granules into the screening box 41, thus improving the stability of equipment operation.

[0051] Working principle: The first motor 21 drives the crushing roller 22 to rotate. Multiple crushing rollers 22 cooperate to squeeze and shear the input waste plastic, crushing large pieces of waste plastic into uniform plastic particles. The crushed particles fall into the conveyor belt 33 below, which smoothly conveys the crushed plastic particles from the crushing mechanism 2 into the screening box 41, achieving precise connection between the crushing and screening processes. When the plastic particles conveyed by the conveyor belt 33 fall between the rotating plates 37, the rotating plates 37 rotate and quantitatively push the particles into the screening box 41, achieving quantitative discharge of plastic particles. During the sorting of plastic particles, the plastic particles are first conveyed to the surface of the screen 443. Because the screen 443 is installed at an angle, it is easy for the plastic particles to slide and screen under their own gravity, achieving preliminary separation of particles of different sizes. Subsequently, the second motor 421 drives the fixed rod 422 to rotate. The friction texture 424 on the fixed rod 422 rubs against the friction roller 4231 on the inner wall of the screening box 41 to generate static electricity. The static electricity is conducted to the electrostatic adsorption plate 426, realizing the electrostatic adsorption of metal impurities in the plastic particles. The cooperation of multiple friction rollers 4231 and friction texture 424 increases the friction contact area, improves the static electricity generation efficiency, and ensures more complete adsorption of metal impurities. At the same time, the rotation of the fixed rod 422 drives the scraper 427 to slide on the outer surface of the cylinder. When it scrapes the surface of the rubber plate 425, it can promptly remove the impurities attached to the adsorption plate, avoid the adsorption plate from clogging and the reduction of electrostatic adsorption efficiency, and ensure the continuous and stable operation of electrostatic adsorption.

[0052] The above are merely specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on the present invention to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of the present invention.

Claims

1. A plastic waste granulator granulation and recycling equipment, comprising a mounting frame (1), characterized in that: A sorting mechanism (4) is provided at the top of the mounting frame (1). The sorting mechanism (4) includes a screening box (41) fixedly installed at the top of the mounting frame (1). A screening assembly (44) is provided inside the screening box (41). The screening assembly (44) includes a screen (443) installed at an angle inside the screening box (41). A magnetic separation assembly (42) is provided on the surface of the screening box (41) near the screen (443). The magnetic separation assembly (42) includes an electrostatic adsorption plate (426) provided at the top of the screen (443). The electrostatic adsorption plate (426) is fixedly installed on the inner wall of the screening box (41) by a support frame (428). A rubber plate is provided on one side of the electrostatic adsorption plate (426). (425), and the rubber plate (425) and the electrostatic adsorption plate (426) form a cylinder. The outer surface of the screening box (41) is fixedly installed with a second motor (421). The output shaft of the second motor (421) is fixedly installed with a fixing rod (422). The outer surface of the fixing rod (422) is fixedly installed with a scraper (427), and the scraper (427) slides on the outer surface of the cylinder. The outer surface of the fixing rod (422) is fixedly installed with friction patterns (424). The inner wall of the screening box (41) is provided with multiple friction components (423). The friction components (423) include multiple friction rollers (4231) installed inside the cylinder for generating static electricity by rubbing against the friction patterns (424).

2. The plastic waste granulator pellet screening and recycling equipment according to claim 1, characterized in that: The outer surface of the friction roller (4231) is provided with a plurality of inverted conical pits (4232) to prevent particles from slipping on the surface, and the outer surface of the friction roller (4231) is coated with an aluminum titanate conductive ceramic coating. The inner wall of the friction roller (4231) is provided with a fixing layer (4234), and the fixing layer (4234) is made of quartz glass core rod material.

3. The plastic waste granulator pellet screening and recycling equipment according to claim 1, characterized in that: The outer surface of the friction roller (4231) is provided with a plurality of air holes (4233). The interior of the friction roller (4231) is filled with an activated carbon layer (4235), and the activated carbon layer (4235) is connected to the air holes (4233). A water cooling pipe (4236) is provided at the center of the friction roller (4231). The end of the water cooling pipe (4236) is connected to an external circulating water system through a rotary joint. A plurality of heat-absorbing rods (4237) are provided between the water cooling pipe (4236) and the activated carbon layer (4235).

4. The plastic waste granulator pellet screening and recycling equipment according to claim 1, characterized in that: The outer surface of the screening box (41) is provided with an air separation component (43). The air separation component (43) includes a fan (433) fixedly installed on the outer surface of the screening box (41). The input end of the fan (433) is connected to a suction component (432). The suction component (432) includes a recycling pipe head set on the inner wall of the screening box (41) near the rubber plate (425). The output end of the fan (433) is connected to a discharge hopper (434) for discharging the selected waste. The input end of the fan (433) is connected to a dust suction plate (431), and the dust suction plate (431) is located on one side of the waste plastic feed end.

5. The plastic waste granulator pellet screening and recycling equipment according to claim 4, characterized in that: The screening box (41) is fixedly installed inside the bottom end of the screen (443) with multiple air nozzles (444) for vibrating the screen (443). The air nozzles (444) and the output end of the blower (433) are connected and installed through a connecting pipe (441), and an intermittent solenoid valve is provided on the connecting pipe (441). The end of the screening box (41) near the screen (443) is connected and installed with a discharge plate (442).

6. The plastic waste granulator pellet screening and recycling equipment according to claim 1, characterized in that: The mounting frame (1) is provided with a recycling mechanism (5) near the top of the screening box (41). The recycling mechanism (5) includes a collection box (52) fixedly installed at the top of the mounting frame (1). The collection box (52) is connected to the screening box (41). A discharge pipe (51) is fixedly installed inside the collection box (52). A groove (53) is opened inside the collection box (52) near the discharge pipe (51). A through hole communicating with the groove (53) is opened on the surface of the discharge pipe (51). A heat-conducting rod (57) is rotatably installed inside the discharge pipe (51). An agitator (56) for low-damage conveying of plastic particles is fixedly installed on the outer surface of the heat-conducting rod (57). A baffle (58) for closing the groove (53) is fixedly installed on the outer surface of the agitator (56). A third motor (59) is fixedly installed at the top of the mounting frame (1). The output shaft of the third motor (59) is fixedly connected to the heat-conducting rod (57).

7. The plastic waste granulator pellet screening and recycling equipment according to claim 6, characterized in that: A heating box (6) is fixedly installed at the top of the mounting frame (1). The output end of the heating box (6) is connected to one end of the heat-conducting rod (57), and the discharge pipe (51) is connected to the input end of the blower (433) through the auxiliary air pipe (55). A sealing groove (54) for sealing the heat flow is provided between the screening box (41) and the collection box (52).

8. The plastic waste granulator pellet screening and recycling equipment according to claim 1, characterized in that: The top of the mounting frame (1) is provided with a crushing mechanism (2). The crushing mechanism (2) includes a feed box (23) fixedly installed on the top of the mounting frame (1). The feed box (23) is provided with multiple crushing rollers (22) for crushing waste plastics. A first motor (21) is fixedly installed on the outer surface of the feed box (23). The output shaft of the first motor (21) is fixedly connected to one end of the crushing roller (22).

9. A plastic waste granulator pellet screening and recycling equipment according to claim 8, characterized in that: The bottom end of the crushing mechanism (2) is provided with a conveying mechanism (3). The conveying mechanism (3) includes a conveying box (34) fixedly installed on the top of the mounting frame (1). Multiple drive shafts (32) are rotatably installed inside the conveying box (34). A conveyor belt (33) for conveying the crushed waste plastic particles to the screening box (41) is installed between the multiple drive shafts (32). A first belt (31) is provided between one of the drive shafts (32) and the output shaft of the first motor (21).

10. A plastic waste granulator pellet screening and recycling equipment according to claim 9, characterized in that: A rotating shaft (36) is rotatably installed between the conveyor belt (33) and the screening box (41). Multiple rotating plates (37) for quantitative discharge are fixedly installed on the outer surface of the rotating shaft (36). A second belt (35) is driven between the rotating shaft (36) and the drive shaft (32).

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