A plastic raw material pretreatment apparatus and method

Abstract

The application provides a plastic raw material pretreatment device and method, aiming at solving the technical problem that impurities and dust particles in the existing plastic particles are not thoroughly removed. The device comprises a machine box with a connected impurity removal part, a feeding part and a cleaning part; an impurity removal structure is arranged inside the impurity removal part; a screening structure is arranged at the bottom of the feeding part; and a vibrating mechanism is in transmission connection with the feeding part. The processing method is as follows: metal impurities in the plastic particles are adsorbed, and the adsorbed impurities are recycled into a recycling box; the plastic particles are vibrated and conveyed to the cleaning part through the feeding part, in the feeding process, the powder is discharged from the powder falling port and the gap, and then falls into the first cleaning chamber for primary cleaning and is sent into the second cleaning chamber for secondary spray cleaning. The plastic particles are sequentially subjected to magnetic impurity removal, vibration conveying, dust removal and multiple cleaning, so that the impurities, dust and other powders in the plastic particles can be thoroughly removed, and the quality of the plastic raw material is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of plastic processing technology, and in particular to a plastic raw material pretreatment device and method. Background Technology

[0002] The main raw materials for plastic bottles include polyethylene (PE), polypropylene (PP), and polyethylene terephthalate (PET) granules. Before production, the raw materials typically need to be cleaned and dried, and the granules undergo screening (using filters with different pore sizes to grade and screen granules of different sizes) after drying or before cleaning to ensure the quality of the raw materials meets production requirements. Currently, during the pretreatment of plastic granules, impurities and dust particles are not thoroughly removed. For example, recycled waste plastics, after being crushed into granules or flakes, usually contain a significant amount of impurities, dust, or fine particulate powder. Furthermore, dust can be introduced during processing, transportation, or storage. If the content of these impurities and powders is too high, it will affect the quality and performance of subsequent plastic products. Summary of the Invention

[0003] To address the shortcomings of the existing technology, the present invention provides a plastic raw material pretreatment device and method to solve the problem of insufficient removal of impurities and dust particles from plastic granules.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A plastic raw material pretreatment device includes: a chassis having a connected impurity removal section, a feeding section, and a cleaning section; an impurity removal structure disposed inside the impurity removal section; the impurity removal structure includes: a recovery box disposed inside the impurity removal section, the recovery box dividing the impurity removal section into an impurity removal chamber and a recovery chamber; a magnetic suction plate disposed inside the impurity removal chamber; a driving component drivingly connected to the magnetic suction plate, the magnetic suction plate being able to rotate under the action of the driving component to drop adsorbed metal impurities into the recovery box; a guide plate inclinedly disposed above the magnetic suction plate, the lower end of the guide plate forming a material discharge channel between itself and the inner wall of the impurity removal section, the guide plate guiding the material from the feed hopper through the material discharge channel onto the magnetic suction plate; a screening structure disposed at the bottom of the feeding section; the screening structure includes a first screening group and a second screening group, the first screening group and the second screening group being arranged in a stepped structure, each of the first screening group and the second screening group having multiple powder discharge ports; and a vibration mechanism drivingly connected to the feeding section.

[0006] This invention processes plastic granules through multiple steps, including magnetic impurity removal, vibratory conveying for dust / powder removal, and washing. This ensures thorough removal of impurities, dust, and fine particles, significantly improving the quality of the raw materials and providing stable and suitable raw materials for plastic products. The entire processing procedure is highly continuous, with a short turnaround time and high efficiency. Specifically, an impurity removal structure is installed before the washing process to further remove impurities from the plastic granules, ensuring more thorough removal of metallic impurities. Once a certain amount of impurities has been adsorbed, the magnetic plates are flipped to recover them. The flipping operation is simple and convenient; after the plates are flipped and impurities are recovered, the next round of adsorption can begin, ensuring good continuity. After impurity removal, the plastic granules are vibrated and conveyed to the washing section. During this process, the granules pass through a stepped screen plate, and under the action of the vibration mechanism, most of the small powder particles are discharged from the powder discharge port.

[0007] Optionally, the impurity removal structure further includes: a lifting plate, movably disposed in the recycling chamber; and a lifting mechanism, drivenly connected to the lifting plate; wherein the recycling box is disposed on the lifting plate, and the lifting plate can move upward or downward under the drive of the lifting mechanism.

[0008] Optionally, the magnetic plate is an electromagnetic plate, which becomes magnetic when energized and loses its electromagnetic properties when de-energized.

[0009] Optionally, an electromagnet is fixed on the lifting plate, and the recycling box and magnetic plate are both made of magnetically conductive metal. The bottom of the recycling box can be magnetically connected to the electromagnet. When the lifting plate moves the electromagnet and the recycling box upward and the recycling box abuts against the magnetic plate, the electromagnet can be magnetically guided to the magnetic plate through the recycling box. When the lifting plate moves the electromagnet and the recycling box downward and the recycling box detaches from the magnetic plate, the magnetic plate is demagnetized.

[0010] Optionally, the magnetic plate is provided with multiple metal pillars. The arrangement of multiple metal pillars allows the plastic particles to make full contact with the magnetic metal pillars, thereby improving the impurity removal effect and adsorbing more magnetic impurities.

[0011] Optionally, the surface of the magnetic suction plate is gradually inclined from one end of the driving member to the other end, and the material dropping channel is located above the high end of the magnetic suction plate.

[0012] Optionally, a recycling port for removing the recycling box is provided on the side wall of the recycling chamber, and a door panel is movably provided on the recycling port.

[0013] Optionally, the impurity removal section and the feeding section form an L-shaped structure.

[0014] Optionally, the chassis includes an upper box with a rectangular parallelepiped structure, the impurity removal chamber and the feeding section are formed inside the upper box, a first mounting port is provided on the bottom of the upper box, a recycling box with a top opening is provided at the first mounting port, a recycling chamber is formed inside the recycling box, and the recycling container is disposed inside the recycling box.

[0015] Optionally, the first screening group and the second screening group are arranged opposite to each other. The first screening group has a downward stepped structure, and the second screening group has an upward stepped structure. The first screening group includes multiple first screening plates, which form a downward stepped structure along the material travel direction. The second screening group includes multiple second screening plates, which form an upward stepped structure along the material travel direction. The sidewalls of two adjacent first screening plates are respectively provided with inclined surfaces, forming a first channel. The sidewalls of two adjacent second screening plates are respectively provided with inclined surfaces, forming a second channel. Both the first and second channels are inverted V-shaped channels. A powder discharge port communicating with the channel is provided between the inclined surface and the upper surface of the screening plate.

[0016] Optionally, the first screening group and the second screening group are detachably mounted in the second mounting port via the first mounting base and the second mounting base, respectively.

[0017] Optionally, the top ends of the first and second channels are provided with gaps.

[0018] Optionally, the first and second screening groups are equipped with collection chambers at their bottoms. These collection chambers are connected to multiple powder discharge ports and are connected to a dust extraction fan via ductwork. The collection chambers at the bottom of the screening plates, along with the dust extraction fan that generates negative pressure suction, enable the bottom of the screening plates to have a suction function. When plastic particles pass through the screening plates, the dust extraction fan helps the small particles to be discharged more smoothly from the powder discharge ports and gaps, further improving the dust removal effect and significantly enhancing the quality of the plastic raw materials.

[0019] Optionally, a guide block is abutted at the end of the magnetic suction plate away from the driving component. The guide block is located above the first mounting port and overlaps with the screening structure. The top of the recycling box forming the recycling chamber forms a groove with the inner wall of the first mounting port and the recycling box or partition. A notch communicating with the inside of the collection bin is provided on one side of the groove. A blower mechanism is provided on one side of the outlet end of the feeding part to blow air towards the notch. By providing a blower mechanism at the outlet end of the feeding part, the airflow generated by the blower mechanism blowing air towards the inlet end of the feeding part can blow away dust, further improving the dust removal effect and improving the purity and quality of the plastic particles.

[0020] Optionally, the cleaning unit includes a connected feeding channel, a first cleaning chamber, and a second cleaning chamber; the upper end of the feeding channel is connected to the outlet end of the feeding unit; the bottom of the first cleaning chamber is inclined; the second cleaning chamber is located on one side of the first cleaning chamber, and a filter screen is provided on the second cleaning chamber, which divides the second cleaning chamber into a spray chamber and a drain chamber, and the spray chamber is connected to the upper end of the first cleaning chamber; a water inlet and a drain outlet are provided on the first cleaning chamber; a spraying device is provided on the spray chamber; a first screw feeding assembly adapted to the first cleaning chamber is rotatably arranged on the bottom of the first cleaning chamber; and a second screw feeding assembly is arranged above the filter screen.

[0021] Optionally, a drive mechanism is provided on the outside of the chassis, and the drive mechanism is drivenly connected to the first spiral feeding assembly. The first spiral feeding assembly, driven by the drive mechanism, transports the material in the first cleaning chamber to the second cleaning chamber. The drive mechanism includes a drive motor and a transmission shaft connected to the power output end of the drive motor. A driven shaft connected to a support column is provided above the transmission shaft. The transmission shaft and the driven shaft are drivenly connected. The end of the driven shaft away from the support column passes through the side wall of the chassis and is drivenly connected to a stirring shaft provided in the first cleaning chamber. A stirring blade is provided at the lower end of the stirring shaft.

[0022] A method for pretreating plastic raw materials, implemented using plastic raw material pretreatment equipment, includes the following steps:

[0023] Step S1: Use a magnetic plate to adsorb metal impurities in the plastic particles and collect the adsorbed impurities into a recycling box.

[0024] In step S2, the plastic granules are conveyed to the cleaning section by vibration from the feeding section. During the vibration feeding process, when the plastic granules pass through the stepped screen plate, the powder is discharged from the powder discharge port or the powder discharge port and the gap under the action of the vibration mechanism and the dust suction fan.

[0025] In step S3, the plastic granules fall from the outlet of the feeding section into the first cleaning chamber through the feeding channel for initial cleaning. After the initial cleaning is completed, they are sent to the second cleaning chamber for secondary spray cleaning.

[0026] The plastic raw material pretreatment method of this invention involves multiple processes, including magnetic impurity removal, vibration conveying for dust removal, and two washing cycles, when processing plastic granules. This process thoroughly removes impurities, dust, and fine particles from the plastic granules, greatly improving the quality of the plastic raw materials and providing stable and suitable raw materials for plastic products. The entire processing procedure has good continuity, short processing time, and high processing efficiency.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] 1. This invention incorporates a purification structure at the pre-cleaning stage. This structure further removes impurities from the plastic granules, ensuring more thorough removal of metallic impurities. Multiple metal pillars allow for full contact between the plastic granules and the magnetic pillars, enhancing impurity removal and attracting more magnetic impurities. Once a certain amount of impurities has been adsorbed, the magnetic plate is flipped to recover them. The flipping operation is simple and convenient; after the plate is flipped and impurities are recovered, the next round of adsorption can begin, ensuring good continuity of operation.

[0029] 2. After impurity removal, the plastic granules are conveyed to the washing section via a vibrating feeding mechanism. During this process, the granules pass through a stepped screen plate. Under the action of the vibration mechanism, most of the small powder particles are discharged from the powder discharge port or its gaps. Furthermore, the collection bin at the bottom of the screen plate, along with a dust-collecting fan that generates negative pressure, provides a suction function at the bottom of the screen plate. As the plastic granules pass through the screen plate, the dust-collecting fan helps the small powder particles to be discharged more smoothly from the powder discharge port and gaps, further improving the dust removal effect and significantly enhancing the quality of the plastic raw materials. Simultaneously, a blower mechanism at the outlet of the feeding section blows air towards the inlet, removing dust and further improving the dust removal effect, thus increasing the purity and quality of the plastic granules.

[0030] 3. After the plastic granules are thoroughly screened and powder is removed in the feeding section, they fall into the cleaning section. By dividing the cleaning section into a first cleaning chamber and a second cleaning chamber, the plastic granules can be soaked and cleaned in the first cleaning chamber, and then sprayed and cleaned in the second cleaning chamber. This thoroughly removes dust, small particles and other powder from the plastic granules, ensuring the cleanliness of the plastic raw materials and the quality of subsequent processing.

[0031] In processing plastic granules, this invention involves multiple steps, including magnetic impurity removal, vibratory conveying for dust removal (using a sieve plate and bottom ventilation to sieve out powder, and a blower mechanism to blow air), and two cleaning processes (immersion cleaning and spray cleaning in the first and second cleaning chambers, respectively). This ensures that impurities, dust, and fine particles in the plastic granules are thoroughly removed, greatly improving the quality of the plastic raw materials and providing stable and suitable raw materials for plastic products. The entire processing procedure has good continuity, short processing time, and high processing efficiency. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application 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 some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of one embodiment of the plastic raw material pretreatment equipment of the present invention.

[0034] Figure 2 This is a schematic diagram of one embodiment of the impurity removal structure in this invention.

[0035] Figure 3 This is a schematic diagram of one embodiment of the screening structure and vibration mechanism in this invention.

[0036] Figure 4 This is a schematic diagram of one embodiment of the screening structure in this invention.

[0037] Figure 5 for Figure 4 Enlarged view of the structure at point A in the middle.

[0038] Figure 6 This is a three-dimensional structural diagram of the sieve structure in this invention.

[0039] Figure label:

[0040] 1. Chassis; 11. Feeding bin; 12. Impurity removal section; 12a. Impurity removal chamber; 12b. Recovery chamber; 121. Recovery port; 122. First mounting port; 123. Guide block; 124. Notch; 13. Feeding section; 14. Cleaning section; 14a. Discharge channel; 14b. First cleaning chamber; 14c. Second cleaning chamber; 141. Filter screen; 142. Drain pipe;

[0041] 2. Impurity removal structure; 21. Recycling box; 22. Magnetic suction plate; 23. Driving component; 24. Guide plate; 25. Lifting plate; 26. Lifting mechanism; 27. Metal column; 28. Electromagnet;

[0042] 3. Screening structure; 31. First screening group; 311. First screening plate; 3111. Powder discharge port; 3112. Inclined surface; 32. Second screening group; 321. Second screening plate; 33. First channel; 34. First mounting base; 35. Second mounting base;

[0043] 4. Vibration mechanism; 41. Vibration mounting base;

[0044] 5. Collection chamber; 51. Through hole;

[0045] 6. Blowering mechanism; 7. First spiral feeding assembly; 8. Second spiral feeding assembly;

[0046] 9. Drive mechanism; 91. Drive motor; 92. Transmission shaft; 93. Universal joint; 94. Support column; 95. Driven shaft; 96. Belt; 97. Driving bevel gear; 98. Agitator shaft; 99. Driven bevel gear;

[0047] 10. Drying structure; 101. Heating base; 102. Drying oven; 103. Mixing mechanism. Detailed Implementation

[0048] 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.

[0049] Example 1

[0050] like Figures 1-6 As shown in the figure, an embodiment of the present invention provides a plastic raw material pretreatment device, including: a casing 1, a cleaning structure 2, a screening structure 3, and a vibration mechanism 4.

[0051] The machine casing 1 contains, in sequence, a purification section 12, a feeding section 13, and a cleaning section 14. A feeding hopper 11 is located above the purification section 12. A purification structure 2 is disposed inside the purification section 12, and a screening structure 3 is located at the bottom of the feeding section 13. A vibration mechanism 4 is connected to the feeding section 13. In use, granular plastic raw materials enter the purification section 12 from the feeding hopper 11. The purification structure 2 adsorbs metallic impurities in the material. Under vibration, the material enters one end of the feeding section 13 from the outlet end of the purification section 12, and is then conveyed from one end of the feeding section 13 to the other end. During the vibrating feeding process, the screening structure 3 removes powder or small granular particles from the material. The removed material falls into the cleaning section 14 for cleaning, and then the cleaned material can be dried and screened.

[0052] Example 2

[0053] This invention application provides a plastic raw material pretreatment device, as shown in the following embodiment. Figure 1 and Figure 2 As shown, in this embodiment, the impurity removal structure 2 includes: a recycling box 21, a magnetic suction plate 22, a driving component 23, and a flow guide plate 24.

[0054] A recycling box 21 is disposed within the impurity removal section 12, dividing the section into an impurity removal chamber 12a and a recycling chamber 12b. A magnetic suction plate 22 is disposed in the impurity removal chamber 12a above the recycling box 21. The top of the recycling box 21 is open and adapted to the magnetic suction plate 22 and the recycling chamber 12b. The magnetism of the magnetic suction plate 22 can attract metallic impurities in the material. A driving component 23 is drivenly connected to the magnetic suction plate 22. Under the action of the driving component 23, the magnetic suction plate 22 can be flipped. After flipping, the magnetic suction plate 22 is demagnetized so that the attracted metallic impurities fall into the recycling box 21. The guide plate 24 is inclined above the magnetic suction plate 22. The high end of the guide plate 24 is connected to the top wall of the impurity removal section 12, and the low end faces the side wall of the impurity removal section 12. A material dropping channel is formed between the low end and the inner wall of the impurity removal section 12. The guide plate 24 guides the material of the feeding bin 11 to the material dropping channel, and the material falls onto the magnetic suction plate 22 through the material dropping channel.

[0055] Optionally, the upper and lower surfaces of the magnetic suction plate 22 are gradually inclined from one end of the driving member 23 to the other end, and the lower end of the guide plate 24 is set close to the driving member 23, that is, the material discharge channel formed by the guide plate 24 is located above the higher end of the magnetic suction plate 22.

[0056] Optionally, a recycling port 121 for removing the recycling box 21 is provided on the side wall of the recycling chamber 12b. A door panel is movably provided on the recycling port 121. When in use, the recycling box 21 can be removed by opening the door panel.

[0057] In one implementation scenario, the impurity removal unit 12 and the feeding unit 13 form an L-shaped structure. Optionally, the chassis 1 includes an upper box with a rectangular parallelepiped structure. The impurity removal chamber 12a and the feeding unit 13 are formed inside the upper box. A first mounting port 122 is provided at the bottom of one end of the upper box. A recycling box with a top opening is provided at the first mounting port 122. A recycling chamber 12b is formed inside the recycling box. The impurity removal chamber 12a is above the first mounting port 122. A recycling box 21 is disposed inside the recycling box. The recycling port 121 is opened on one side wall of the recycling box.

[0058] Optionally, the upper housing of the chassis 1 is provided with a second mounting port, which is located on one side of the first mounting port 122, and the screening structure 3 is fixedly or detachably installed in the second mounting port.

[0059] Optionally, the vibration mechanism 4 is mounted at the bottom of the upper housing via a vibration mounting base 41. When the vibration mechanism 4 is working, it generates vibration and transmits it to the upper housing through the vibration mounting base 41, causing the upper housing to vibrate at a high frequency. The material enters the inlet of the feeding section 13 from the outlet end of the impurity removal section 12, and then enters the cleaning section 14 through multiple screen plates. In use, the vibration generated by the vibration mechanism 4 can be transmitted to the magnetic suction plate 22, or a separate vibrator can be installed on the magnetic suction plate 22.

[0060] Optionally, the end of the magnetic suction plate 22 away from the driving component 23 is connected to a guide block 123. Both ends of the guide block 123 are connected to the front and rear side walls of the impurity removal section 12, and one side is connected to one end of the magnetic suction plate 22. The guide block 123 can also be inclined, that is, the higher end of the guide block 123 is connected to the lower end of the magnetic suction plate 22, and the upper surface of the guide block 123 and the upper surface of the magnetic suction plate 22 form an inclined surface.

[0061] Optionally, a sealing layer is provided on the right side wall and front and rear side walls of the impurity removal section 12, as well as on the right side wall of the guide block 123. The sealing layer is adapted to the magnetic suction plate 22, and the four sides of the magnetic suction plate 22 are pressed and connected to the sealing layer.

[0062] In one implementation scenario, the driving component 23 includes a rotating shaft and a turntable connected to the rotating shaft. One end of the rotating shaft is connected to the magnetic suction plate 22, and the other end passes through the right side wall of the impurity removal section 12 and is connected to the turntable. In use, rotating the turntable causes the magnetic suction plate 22 to flip via the rotating shaft. Optionally, multiple rotating shafts can be used. One end of each shaft is connected to the magnetic suction plate 22, and the other end passes through the side wall of the impurity removal section 12 and is connected to a connecting plate. The turntable is connected to the side wall of the connecting plate away from the rotating shaft. In use, rotating the turntable causes the connecting plate to rotate, which in turn causes the rotating shaft to rotate, and the rotating shaft causes the magnetic suction plate 22 to flip.

[0063] In another implementation scenario, the driving component includes a motor and a rotating shaft. One end of the rotating shaft is connected to the power output end of the motor, and the other end passes through the right side wall of the impurity removal section 12 and is connected to the magnetic suction plate 22. When the motor is started, the motor drives the magnetic suction plate to rotate through the rotating shaft.

[0064] Example 3

[0065] Based on Embodiment 2, in this embodiment, the impurity removal structure 2 further includes a lifting plate 25 and a lifting mechanism 26. The recycling box 21 is movably disposed within the recycling chamber 12b via the lifting plate 25.

[0066] Specifically,

[0067] A lifting plate 25 is located at the bottom of the recycling box 21. A lifting mechanism 26 is driven to the lifting plate 25, allowing the recycling box 21 to move upwards or downwards under the influence of the lifting mechanism 26. When the magnetic suction plate 22 normally adsorbs metal impurities, the recycling box 21 is positioned close to the magnetic suction plate 22 under the action of the lifting mechanism 26. That is, the upper surface of the recycling box 21 rests against the lower surface of the magnetic suction plate 22 to prevent material from falling into the recycling chamber 12b. When it is necessary to pour the metal impurities on the magnetic suction plate 22 into the recycling box 21, the recycling box 21 is first moved downwards, and then the magnetic suction plate 22 is flipped to pour the adsorbed metal impurities into the recycling box 21.

[0068] Optionally, the lifting mechanism 26 may be an electric telescopic rod or a lifting cylinder.

[0069] Optionally, the magnetic plate 22 may have multiple metal posts 27. The metal posts 27 are made of magnetically conductive metal.

[0070] In this implementation scenario, the magnetic plate 22 is an electromagnetic plate. The magnetic plate 22 becomes magnetic when energized and loses its magnetism when de-energized. When energized, the magnetic plate 22 attracts metallic impurities from the flowing material. To empty the metallic impurities from the magnetic plate 22 into the recycling box 21, the magnetic plate 22 can be flipped first, and then the power to the magnetic plate 22 can be de-energized to pour the attracted metallic impurities into the recycling box 21. Alternatively, the magnetic plate 22 can be de-energized first and then flipped.

[0071] In another implementation scenario, an electromagnet 28 is provided between the lifting plate 25 and the recycling box 21. In this embodiment, both the recycling box 21 and the magnetic plate 22 are made of magnetically conductive metal. The bottom of the recycling box 21 can be magnetically connected to the electromagnet 28. The lifting plate 25 drives the electromagnet 28 and the recycling box 21 to move upward, thereby causing the recycling box 21 to come into contact with the magnetic plate 22. The electromagnet 28 is energized, so that both the recycling box 21 and the magnetic plate 22 against the recycling box 21 become magnetic, so that the magnetic plate 22 can attract metal impurities. When it is necessary to pour the metal impurities on the magnetic plate 22 into the recycling box 21, the electromagnet 28 and the recycling box 21 move downward, so that the recycling box 21 is detached from the magnetic plate 22, thereby demagnetizing the magnetic plate 22. Then, the driving component 23 drives the magnetic plate 22 to flip so that the attracted metal impurities fall into the recycling box 21.

[0072] Optionally, the upper and lower surfaces of the magnetic suction plate 22 are each provided with a number of metal pillars 27. When the lifting plate 25 moves the recycling box 21 upward, and the recycling box 21 comes into contact with the magnetic suction plate 22, the metal pillars 27 can also avoid contact with the inside of the recycling box 21. In this design using the electromagnet 28, the magnetic conduction effect between the electromagnet 28 and the magnetic suction plate 22 can be improved. At the same time, after the magnetic suction plate 22 is flipped over and the impurities are collected, the magnetic suction plate 22 does not need to be flipped over again to start the next round of adsorption, resulting in good work continuity. Of course, the magnetic suction plate 22 can also be flipped to an inclined state. That is, the magnetic suction plate 22 can be flipped to an inclined state, and by demagnetizing the magnetic suction plate 22, the adsorbed metal impurities slide down the inclined surface into the recycling box 21 below.

[0073] Optionally, when the magnetic plate 22 is tilted, the lengths of the multiple metal pillars 27 are different, with each metal pillar 27 able to abut against the inner surface of the recycling box 21.

[0074] Example 4

[0075] This invention application provides a plastic raw material pretreatment device, as shown in the following embodiment. Figure 1 , Figures 3-6As shown, in this embodiment, the screening structure 3 includes a first screening group 31 and a second screening group 32 arranged opposite to each other. The first screening group 31 has a downward stepped structure, and the second screening group 32 has an upward stepped structure. Both the first screening group 31 and the second screening group 32 are provided with multiple powder discharge ports 3111. In use, under the action of the vibration mechanism 4, the material is fed from the inlet end of the feeding section 13 to the cleaning section 14. The material will pass through the first screening group 31 and the second screening group 32 in sequence. During feeding, large particles are usually in the upper part and small powder particles are in the lower part. The material first undergoes preliminary powder screening through the downward stepped structure, and then undergoes secondary powder screening through the upward stepped structure. The upward stepped structure can slow down the flow rate of the material, increase the residence time of the material being screened, and improve the powder removal effect.

[0076] Optionally, the powder discharge port 3111 has an elongated structure, and the elongated powder discharge port 3111 is arranged along the length of the screen plate, i.e.: Reference Figure 6 As shown, the elongated powder outlet 3111 is set along the X-axis.

[0077] Optionally, the first screening group 31 includes multiple first screening plates 311, which form a downward stepped structure along the material travel direction, i.e., the multiple first screening plates 311 are arranged in a stepped manner from high to low along the Y-axis. The second screening group 32 includes multiple second screening plates 321, which form an upward stepped structure along the material travel direction, i.e., the multiple second screening plates 321 are arranged in a stepped manner from low to high along the Y-axis.

[0078] Optionally, the sidewalls of two adjacent first sieve plates 311 are respectively provided with inclined surfaces 3112, and the two inclined surfaces 3112 form a first channel 33. The first channel 33 has an inverted V-shaped structure, and the upper surface of the first sieve plate 311 is a stepped surface. A powder discharge port 3111 communicating with the first channel 33 is opened between the inclined surface 3112 and the stepped surface. The structure of the second sieve plate 321 is basically the same as that of the first sieve plate 311, that is, the sidewalls of two adjacent second sieve plates 321 are also respectively provided with inclined surfaces 3112, and the two inclined surfaces 3112 form a second channel. The second channel has an inverted V-shaped structure, and the upper surface of the second sieve plate 321 is a stepped surface. A powder discharge port 3111 communicating with the second channel is opened between the inclined surface 3112 and the stepped surface.

[0079] Furthermore, a connected straight surface is provided above the right-side inclined surface of the first channel 33. This straight surface creates a step between two adjacent screen plates. Specifically, the left side of the first screen plate 311 has a straight surface and an inclined surface connected to the straight surface, while the right side of the first screen plate 311 has an inclined surface. After the two first screen plates 311 are joined together, their inclined surfaces form an inverted V-shaped first channel 33, with the straight surface located above the first channel 33. The straight surface above the second channel is the opposite of the first channel 33. Specifically, the right side of the second screen plate 321 has a straight surface and an inclined surface connected to the straight surface, while the left side of the second screen plate 321 has an inclined surface. After the two second screen plates 321 are joined together, they form an inverted V-shaped second channel, with the straight surface located above the second channel.

[0080] The connection between the first screening plate 311 and the second screening plate 321 can be arranged in a straight line, that is, the straight surface on the left side of the first screening plate 311 is connected to the straight surface on the right side of the second screening plate 321.

[0081] The screening plates on both sides of the screening structure 3 are flat structures, that is: the side walls of the screening plates on the right side of the first screening group 31 and the left side of the second screening group 32 are flat structures. These flat structures are respectively set to fit the inner walls of the left and right sides of the second mounting port. The side of the screening plate away from the second mounting port has a slope.

[0082] Optionally, there is a gap (not shown in the figure) between every two adjacent first screen plates 311 and between every two adjacent second screen plates 321. That is, the top of the first channel 33 and the second channel of the inverted V-shaped structure have gaps that allow powder to fall. In this way, when the material is fed from the inlet end of the feeding section 13 to the washing section 14, the material will pass through the first screen plate 311 and the second screen plate 321 in sequence. Through the cooperation of the powder drop port 3111 and the gap, the small particles of powder can be further discharged, which greatly improves the powder removal effect and the quality of the granular raw materials.

[0083] Optionally, the size of the powder outlet 3111 and / or the gap is approximately 1mm.

[0084] In one embodiment, the screening structure 3 further includes two first mounting seats 34 and two second mounting seats 35, which are connected to each other. The two ends of a plurality of first screening plates 311 are respectively connected to the sidewalls of the first mounting seats 34, and the plurality of first screening plates 311 located between the two first mounting seats 34 are arranged in a downward stepped manner along the Y-axis. The two ends of a plurality of second screening plates 321 are respectively connected to the sidewalls of the second mounting seats 35, and the plurality of second screening plates 321 located between the two second mounting seats 35 are arranged in an upward stepped manner along the Y-axis. The screening plates are disposed within a second mounting opening on one side of the first mounting opening 122 via mounting seats.

[0085] Optionally, the adjacent ends of the first mounting base 34 and the second mounting base 35 can be integrated or they can be movably connected.

[0086] In one embodiment, the screening structure 3 is detachably connected to facilitate cleaning and maintenance of the screening plate. As one implementation scenario, in this scenario, one side wall of the upper housing has a slot, and the other side has a through groove; that is, one side of the inner side of the first mounting opening has a slot, and the opposite side has a through groove. The first mounting seat 34 and the second mounting seat 35 are configured in the same way. This embodiment uses the first mounting seat 34 as an example for explanation. One first mounting seat 34 is movably engaged in the slot, and the other first mounting seat 34 is disposed in the through groove via a sealing plate. That is, one side of the first mounting seat 34 is connected to the sealing plate, and the sealing plate is movably engaged in the through groove. In use, by pulling the sealing plate, the first mounting seat 34 engaged in the slot is disengaged from the slot, thereby removing the screening assembly.

[0087] Optionally, a handle is provided on the sealing plate.

[0088] Optionally, a clamping device is provided on the outside of the sealing plate for pressing the sealing plate. The clamping device can be installed on the outer wall of the upper housing, and the end of the clamping device is used to press firmly on the sealing plate. This makes the screen structure 3 more stable during use.

[0089] Example 5

[0090] This invention application provides a plastic raw material pretreatment device. Based on embodiment 4, this embodiment further includes a collection chamber 5, which is located at the bottom of the first screening group 31 and / or the second screening group 32. The top of the collection chamber 5 is open and connected to multiple powder discharge ports 3111. The collection chamber 5 is connected to a dust extraction fan via a duct. Specifically, the collection chamber 5 has a through hole 51, one end of the duct is connected to the through hole 51, and the other end is connected to the input end of the dust extraction fan. The dust extraction fan is not shown in the figure; an existing variable frequency fan can be used. The fan generates negative pressure inside the collection chamber 5, thereby sucking out the powder from the screening plate through the powder discharge ports 3111 and gaps. The sucked-out powder can be stored and collected by a collection device. In this embodiment, when the material is vibrating and conveyed, the powder is screened out by the stepped screening plate, and the negative pressure generated by the dust extraction fan ensures that the waste material on the screening plate can fall smoothly from the powder discharge ports 3111.

[0091] Optionally, the collection chamber 5 is located inside the vibration mounting base 41.

[0092] As an implementation scenario, in this scenario, a collection chamber 5 is respectively set at the bottom of the first screening group 31 and the second screening group 32, and correspondingly, the two collection chambers are respectively connected to a dust collection fan through air ducts.

[0093] As another preferred implementation scenario, in this scenario, refer to Figure 3 As shown, a collection bin 5 is provided at the bottom of the first screening group 31 and the second screening group 32. The bottom of the collection bin 5 is sloped. Specifically, the through hole 51 is located in the middle of the collection bin 5, and one end of the slope is inclined upward from the through hole 51.

[0094] Example 6

[0095] This invention application provides a plastic raw material pretreatment device. Based on embodiment 5, in this embodiment, the top of the collection chamber 5 is open, and its top is connected to the bottom of the upper box outside the mounting groove.

[0096] Example 7

[0097] This invention provides a plastic raw material pretreatment device. Based on embodiment 5, in this embodiment, the top of the collection bin 5 is open, with one side of its top connected to the outer wall of the recycling chamber 12b, and the other side connected to the bottom of the upper box outside the mounting groove. In this embodiment, the guide block 123 is located above the first mounting opening 122. A notch 124 is formed on one side of the top of the recycling bin forming the recycling chamber 12b at the first mounting opening 122. This notch 124 communicates with the internal cavity of the collection bin 5. Since the top of one side of the recycling bin has the guide block 123, a recycling box 21 or partition is provided on one side between the guide block 123 and the recycling bin. Thus, the top wall of the recycling bin, the outer wall of the recycling box 21 or partition, and the inner wall of the first mounting opening 122 form a groove. This groove is part of the first mounting opening 122, and it is located below the guide block 123 and communicates with the collection bin 5 through the notch 124. In other embodiments, no groove is formed below the guide block 123; the top of the recycling bin may abut against the bottom of the guide block 123, or the bottom of the guide block 123 may extend to the top of the recycling bin, or one end of the guide block 123 may be connected to one end of the screening structure 3. However, in this embodiment, a groove is formed at the bottom of the guide block 123 (e.g., Figure 2 (The location indicated by "First Mounting Port 122" in the text).

[0098] The partition is not shown in the diagram. The partition can be set between the guide block 123 on one side of the recycling box 21 and the top of the recycling box, that is: the partition forms the right inner wall of the groove, and the inner wall of the first mounting port 122 is the left inner wall of the groove.

[0099] Optionally, the end of the guide block 123 away from the magnetic plate 22 extends above the first screen plate 311, that is, part of the guide block 123 overlaps with part of the first screen plate 311.

[0100] Optionally, the notch 124 is formed by a gap between the recycling bin and the inner wall of the first mounting port 122.

[0101] Furthermore, a blower mechanism 6 is provided on the side of the screening structure 3 away from the notch 124. When the material is vibrating and fed on the screening plate, the blower mechanism 6 blows air towards the first mounting port 122, which can blow the lighter powder in the material towards the inlet end of the impurity removal section 12 and / or the feeding section 13. On the one hand, the powder can be fed through the screening plate again, and then sucked away by the negative pressure generated by the collection bin 5 during feeding; on the other hand, the powder can be deposited in the groove at the first mounting port 122 and enter the collection bin through the notch 124. In this embodiment, the powder ratio can be further reduced by the setting of the blower mechanism 6.

[0102] In one embodiment, the blower mechanism 6 is mounted on the left side wall of the upper housing.

[0103] It should be noted that the height difference of the stepped structure in the attached figure is schematic, and the distance between the guide block 123 and the first mounting port 122 is also schematic. It is only used to express the idea of ​​this technical solution. In actual application, it can be set according to the specific situation. For example, the guide block 123 can be set upward and close to the feed hopper 11, and the depth of the groove can be increased, so that the dust blown by the blower mechanism 6 can fall into the groove.

[0104] Example 8

[0105] This invention application provides a plastic raw material pretreatment device, as shown in the following embodiment. Figure 1 As shown, in this embodiment, the cleaning unit 14 includes a feeding channel 14a, a first cleaning chamber 14b, and a second cleaning chamber 14c that are connected in sequence. The feeding channel 14a, the first cleaning chamber 14b, and the second cleaning chamber 14c form an L-shaped structure in cross section. The upper end of the feeding channel 14a is connected to the outlet end of the feeding unit 13. The bottom of the first cleaning chamber 14b is inclined, and a water inlet is provided on the first cleaning chamber 14c. A drain outlet is provided at the bottom. The second cleaning chamber 14c is located to one side of the first cleaning chamber 14b, and its upper end is connected to the upper end of the first cleaning chamber 14b. A filter screen 141 is installed on the second cleaning chamber 14c, dividing it into a spray chamber and a drain chamber. The spray chamber is located above the filter screen 141, and the drain chamber is located below it. The spray chamber is connected to the upper end of the first cleaning chamber 14b and contains a spraying device. A drain pipe 142 is connected to the drain chamber. A matching first spiral feeding assembly 7 is rotatably mounted on the bottom of the first cleaning chamber 14b. A second spiral feeding assembly 8 is installed in the spray chamber above the filter screen 141.

[0106] Furthermore, a drive mechanism 9 is provided on the outside of the chassis 1. The drive mechanism 9 is driven and connected to the first spiral feeding assembly 7. Under the drive of the drive mechanism 9, the first spiral feeding assembly 7 transports the material in the first cleaning chamber 14b to the second cleaning chamber 14c.

[0107] Optionally, the drive shaft 92 of the drive mechanism 9 is connected to one end of the transport shaft of the first spiral feeding assembly 7 via a universal joint 93, and the other end of the transport shaft of the first spiral feeding assembly 7 is connected to the transport shaft of the second spiral feeding assembly 8 via a linkage universal joint. Thus, when the drive mechanism 9 drives the first spiral feeding assembly 7 to transport the material in the first cleaning chamber 14b to the second cleaning chamber 14c, it is then transported out by the second spiral feeding assembly 8.

[0108] Optionally, a stirring assembly is installed in the first cleaning chamber 14b. The stirring assembly can agitate the liquid in the first cleaning chamber 14b to improve the cleaning effect.

[0109] The screw feeding assembly includes a conveying shaft and screw blades mounted on the conveying shaft; the spray assembly, not shown in the figure, includes a nozzle mounted at the top inside the first cleaning chamber 14b and a water inlet pipe connected to the nozzle. A water pump is installed on the water inlet pipe, which draws external water into the nozzle and sprays it out from the nozzle. Both the screw feeding assembly and the spray device are relatively mature existing technologies, so they will not be described in detail in this embodiment.

[0110] In use, water is injected into the first cleaning chamber 14b through the water inlet to soak or agitate and clean the plastic raw materials. After cleaning, the drive mechanism 9 is started, and the first spiral feeding assembly 7 transports the material in the first cleaning chamber 14b to the second cleaning chamber 14c. At the same time, the spraying device sprays and rinses the material in the second cleaning chamber 14c. The material is then transported to the next process by the second spiral feeding assembly 8.

[0111] Example 9

[0112] This invention application provides a plastic raw material pretreatment device. Based on embodiment 8, in this embodiment, the drive mechanism 9 includes a drive motor 91 and a transmission shaft 92 connected to the power output end of the drive motor 91. The transmission shaft 92 is rotatably mounted on a support column 94. A driven shaft 95 is rotatably mounted on the support column 94 above the transmission shaft 92. Both the transmission shaft 92 and the driven shaft 95 are equipped with pulleys, and belts 96 are sleeved on the two pulleys. One end of the transmission shaft 92 is connected to one end of the transport shaft of the first spiral feeding assembly 7 through a universal joint 93. The end of the driven shaft 95 away from the support column 94 passes through the side wall of the machine casing and is located above the first cleaning chamber 14, and an active bevel gear 97 is installed at its end. A stirring shaft 98 is rotatably mounted on the feeding channel 14a. The upper end of the stirring shaft 98 is rotatably connected to the top wall of the housing 1 via a bearing, and the lower end extends above the first spiral feeding assembly 7. A stirring blade is provided at the lower part of the stirring shaft 98, and a driven bevel gear 99 meshing with the driving bevel gear 97 is located above the stirring blade. In operation, when the drive motor 91 drives the transmission shaft 92 to rotate, the rotation of the transmission shaft 92 drives the driven shaft 95 to rotate via the belt 96. The rotation of the driven shaft 95 drives the stirring shaft 98 to rotate via the meshing driving bevel gear 97 and driven bevel gear 99, thereby causing the stirring blade to stir within the first cleaning chamber 14b to improve the material cleaning effect. This interconnected design makes the processing equipment compact.

[0113] In one embodiment, the blower mechanism 6 may employ a fan, see reference. Figure 1 As shown, the fan is mounted on the driven shaft 95. In other preferred embodiments, the blower mechanism 6 can be an existing blower, which can be configured to blow away only lighter dust or small particulate matter.

[0114] Example 10

[0115] This invention provides a plastic raw material pretreatment device. In this embodiment, the pretreatment device further includes a drying structure 10, which includes, but is not limited to, a heating seat 101 and a drying chamber 102 disposed on the heating seat 101. The drying chamber 102 has an inlet on one side above which is connected to the outlet of the second cleaning chamber 14c, and an outlet at the lower end of the other side.

[0116] Optionally, the drying oven 102 is equipped with a mixing mechanism 103 for stirring the raw materials.

[0117] Example 11

[0118] This invention provides a method for pretreating plastic raw materials, which includes the following steps:

[0119] Step S1, impurity removal: Use magnetic plate 22 to adsorb metal impurities in plastic particles and collect the adsorbed impurities into recycling box 21.

[0120] Step S1 specifically includes the following process:

[0121] Step S11: Before feeding materials, start the lifting mechanism 26. The lifting mechanism 26 drives the recycling box 21 to rise until the upper end of the recycling box 21 abuts against the lower surface of the magnetic plate 22. Then, power on the magnetic plate 22.

[0122] In step S12, plastic granules are fed into the feed hopper 11 and guided to the magnetic suction plate 22 by the guide plate 24. The magnetic suction plate 22 is energized to adsorb metal impurities in the plastic granules.

[0123] Step S12: Recover the metal impurities adsorbed by the magnetic suction plate 22. The specific operation method is as follows: the feeding hopper 11 stops feeding, the lifting mechanism 26 drives the recovery box 21 to descend, so that the recovery box 21 is away from the magnetic suction plate 22. At this time, the driving component 23 causes the magnetic suction plate 22 to flip. Before or after the magnetic suction plate 22 flips, the power to the magnetic suction plate 22 is cut off so that the adsorbed metal impurities fall into the recovery box 21 below. Finally, the recovery box 21 is taken out by opening the door panel on the recovery port 121.

[0124] In step S12, the recovery of the metal impurities adsorbed by the magnetic plate 22 can be carried out after the plastic granules are fed, or after the magnetic plate 22 or the magnetic plate 22 and the metal column 27 have adsorbed a certain amount of metal impurities.

[0125] In one embodiment, the magnetic plate 22 can be directly made of an electromagnetic plate, and the electromagnetic plate can be made magnetic and demagnetized by energizing or de-energizing it.

[0126] In another implementation attempt, an electromagnet 28 was installed between the lifting plate 25 and the recycling box 21, so that the magnetic suction plate 22 could be made magnetic and demagnetized by means of magnetic conduction.

[0127] Step S2, Vibration conveying to remove powder: The plastic granules are vibrated and conveyed to the cleaning section in the feeding section. During the vibration feeding process, when the plastic granules pass through the stepped screen plate, the powder is discharged from the powder discharge port or the powder discharge port and the gap.

[0128] In one embodiment, in step S2, the dust extraction fan is started, and under the action of the dust extraction fan, the powder can be discharged more smoothly from the powder discharge port 3111 or the powder discharge port 3111 and the gap.

[0129] In one embodiment, in step S2, the blower mechanism 6 is activated, blowing air towards the inlet end of the feeding section 13. The resulting airflow blows dust towards the inlet end of the feeding section 13, and the dust is then discharged into the collection chamber 5 through the dust discharge port 3111 and / or gaps and / or grooves. In this embodiment, the dust extraction fan can be activated simultaneously, allowing the dust to be discharged into the collection chamber 5 more smoothly through the dust discharge port 3111 and / or gaps and / or grooves.

[0130] Step S3, Cleaning: Plastic granules fall from the outlet end of the feeding section 13 into the first cleaning chamber 14b through the feeding channel 14a for initial cleaning. After the initial cleaning is completed, they are sent to the second cleaning chamber 14c for secondary spray cleaning.

[0131] Step S3 specifically includes the following process:

[0132] In step S31, plastic granules fall from the outlet end of the feeding section 13 into the first cleaning chamber 14b through the feeding channel 14a, and liquid is injected into the first cleaning chamber 14b to soak the plastic granules.

[0133] In step S32, after the plastic granules are soaked for a certain period of time, they are conveyed to the second cleaning chamber 14c by the first spiral feeding assembly 7 in an inclined manner. The spraying device is turned on to spray the plastic granules in the second cleaning chamber 14c. The spray water flows to the drain chamber through the filter screen 141. The plastic granules continue to be fed into the next process by the second spiral feeding assembly 8.

[0134] In one embodiment, during step S31, the liquid can be agitated by a stirring component during the soaking process of the plastic particles.

[0135] In one embodiment, the liquid in step S31 can be a chemical cleaning agent, which is used to break down dust and dirt.

[0136] In one embodiment, in step S32, the first spiral feeding assembly 7 and the second spiral feeding assembly 8 may operate intermittently.

[0137] In one embodiment, in step S32, the first spiral feeding assembly 7 is driven by a drive motor 91.

[0138] In one embodiment, in step S32, the second spiral feeding assembly 8 is linked with the first spiral feeding assembly 7.

[0139] In one embodiment, in step S32, a stirring shaft 98 is provided in the first cleaning chamber 14b, and the stirring shaft 98 is linked with the first spiral feeding assembly 7.

[0140] Step S4, Drying: After cleaning in the second cleaning chamber 14c, the plastic granules are sent into the drying chamber 102 for drying.

[0141] In other embodiments, the dried raw material falls into a screening device through the outlet of the drying chamber 102. For example, the screening device includes a tank with multiple screening zones. Filters of different pore sizes are installed in the screening zones, and the plastic is bagged after being graded by the filters. This ensures that dust and powder are thoroughly removed from the plastic granules before grading and bagging, reducing the bottom powder of the finished plastic granules and improving the quality of the plastic products.

[0142] In processing plastic granules, this invention involves multiple steps, including magnetic impurity removal, vibratory conveying with simultaneous powder removal (using a sieve plate and bottom ventilation to sieve out the powder, and a blower mechanism to blow air), and two cleaning processes (immersion cleaning and spray cleaning in the first and second cleaning chambers, respectively). This ensures that impurities, dust, and fine particles in the plastic granules are thoroughly removed, greatly improving the quality of the plastic raw materials and providing stable and suitable raw materials for plastic products. The entire processing procedure has good continuity, short processing time, and high processing efficiency.

[0143] It should be noted that the lifting mechanism, electromagnet, vibration mechanism, vacuum fan, blower mechanism, and drive motor in the pretreatment equipment of this invention are all intelligently controlled by the control system. The airflow of the vacuum fan and blower mechanism 6, the frequency of the vibration mechanism, and various parameters of the soaking time can also be set through the control system.

[0144] In the foregoing, only certain exemplary embodiments have been briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0145] In the description of this invention, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "inner," "outer," "end," and "side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0146] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0147] The terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

Claims

1. A plastic raw material pretreatment device, characterized in that, include: The chassis (1) has a connected impurity removal section (12), a feeding section (13) and a cleaning section (14). A purification structure (2) is disposed inside the purification section (12); the purification structure (2) includes: A recycling box (21) is disposed inside the impurity removal section (12), and the recycling box (21) divides the impurity removal section (12) into an impurity removal chamber (12a) and a recycling chamber (12b). A magnetic suction plate (22) is disposed in the impurity removal chamber (12a); The driving component (23) is driven to connect with the magnetic suction plate (22). The magnetic suction plate (22) can be flipped under the action of the driving component (23) to put the adsorbed metal impurities into the recycling box (21). The guide plate (24) is inclinedly arranged above the magnetic suction plate (22). The lower end of the guide plate (24) forms a material discharge channel with the inner wall of the impurity removal part (12). The guide plate (24) guides the material of the feeding bin (11) to the magnetic suction plate (22) through the material discharge channel. The screening structure (3) is located at the bottom of the feeding section (13); The sieve structure (3) includes a first sieve group (31) and a second sieve group (32). The first sieve group (31) and the second sieve group (32) are arranged in a stepped structure. The first sieve group (31) and the second sieve group (32) are each provided with multiple powder drop ports (3111). The first screening group (31) and the second screening group (32) are arranged opposite to each other. The first screening group (31) has a downward stepped structure, and the second screening group (32) has an upward stepped structure. The first screening group (31) includes multiple first screening plates (311), which form a downward stepped structure along the material travel direction; The second screening group (32) includes multiple second screening plates (321), which form an upward stepped structure along the material travel direction; The side walls of two adjacent first sieve plates (311) are respectively provided with inclined surfaces (3112), and the two inclined surfaces (3112) form a first channel (33); the side walls of two adjacent second sieve plates (321) are respectively provided with inclined surfaces, and the two inclined surfaces form a second channel; both the first channel (33) and the second channel are inverted V-shaped channels; a powder drop outlet connected to the channel is opened between the inclined surface and the upper surface of the sieve plate; The vibration mechanism (4) is connected to the feeding unit (13) via a transmission.

2. The plastic raw material pretreatment equipment according to claim 1, characterized in that, The impurity removal structure (2) also includes: The lifting plate (25) is movably installed inside the recovery chamber (12b); The lifting mechanism (26) is driven to connect with the lifting plate (25); The recycling box (21) is mounted on the lifting plate (25), which can move up or down under the drive of the lifting mechanism (26).

3. The plastic raw material pretreatment equipment according to claim 2, characterized in that: The magnetic plate (22) is an electromagnetic plate. The magnetic plate (22) is magnetic when energized and loses its electromagnetic properties when de-energized. or, An electromagnet (28) is fixed on the lifting plate (25). The recycling box (21) and the magnetic suction plate (22) are both made of magnetically conductive metal. The bottom of the recycling box (21) can be magnetically connected to the electromagnet (28). When the lifting plate (25) drives the electromagnet (28) and the recycling box (21) to move upward, causing the recycling box (21) to abut against the magnetic suction plate (22), the electromagnet (28) can be magnetically guided to the magnetic suction plate (22) through the recycling box (21). When the lifting plate (25) drives the electromagnet (28) and the recycling box (21) to move downward, causing the recycling box (21) to detach from the magnetic suction plate (22), the magnetic suction plate (22) is demagnetized.

4. The plastic raw material pretreatment equipment according to claim 3, characterized in that: The magnetic plate (22) is provided with multiple metal pillars (27); And / or, the surface of the magnetic suction plate (22) is gradually inclined from one end of the driving member (23) to the other end, and the material dropping channel is located above the high end of the magnetic suction plate (22); And / or, the side wall of the recycling chamber (12b) is provided with a recycling port (121) for taking out the recycling box (21), and a door panel is movably provided on the recycling port (121); And / or, the impurity removal section (12) and the feeding section (13) form an L-shaped structure; And / or, the chassis (1) includes an upper box with a rectangular parallelepiped structure, the impurity removal chamber (12a) and the feeding part (13) are formed inside the upper box, a first mounting port (122) is provided at the bottom of the upper box, a recycling box with a top opening is provided at the first mounting port (122), a recycling chamber (12b) is formed inside the recycling box, and the recycling box (21) is provided inside the recycling box.

5. The plastic raw material pretreatment equipment according to claim 1, characterized in that: The first screening group (31) and the second screening group (32) are respectively detachably installed in the second mounting port via the first mounting base (34) and the second mounting base (35); And / or, the top ends of the first channel (33) and the second channel are provided with gaps; And / or, the bottom of the first screening group (31) and the second screening group (32) is provided with a collection bin (5), the collection bin (5) is connected to a plurality of powder drop ports (3111), and the collection bin (5) is connected to a dust suction fan through an air duct.

6. The plastic raw material pretreatment equipment according to claim 5, characterized in that: The magnetic suction plate (22) is connected to a guide block (123) at one end away from the driving member (23). The guide block (123) is located above the first mounting port (122) and partially overlaps with the screening structure (3). The top of the recycling box forming the recycling chamber (12b) forms a groove with the inner wall of the first mounting port (122), the recycling box (21) or the partition, and a notch (124) communicating with the inside of the collection bin (5) is provided on one side of the groove. A blower mechanism is provided on one side of the outlet end of the feeding section (13) to blow air toward the notch (124).

7. The plastic raw material pretreatment equipment according to any one of claims 1 to 6, characterized in that: The cleaning section (14) includes a feeding channel (14a), a first cleaning chamber (14b), and a second cleaning chamber (14c) that are connected to each other. The upper end of the feeding channel (14a) is connected to the outlet end of the feeding section (13); The bottom of the first cleaning chamber (14b) is inclined, and the first cleaning chamber (14b) is provided with a water inlet and a drain outlet; The second cleaning chamber (14c) is located on one side of the first cleaning chamber (14b). A filter screen (141) is provided on the second cleaning chamber (14c). The filter screen (141) divides the second cleaning chamber (14c) into a spray chamber and a drain chamber. The spray chamber is connected to the upper end of the first cleaning chamber (14b). A spraying device is provided on the spray chamber. The bottom of the first cleaning chamber (14b) is provided with a matching first spiral feeding assembly (7); A second spiral feeding assembly (8) is provided above the filter screen (141).

8. The plastic raw material pretreatment equipment according to claim 7, characterized in that: A drive mechanism (9) is provided on the outside of the chassis (1). The drive mechanism (9) is driven and connected to the first spiral feeding assembly (7). The first spiral feeding assembly (7) is driven by the drive mechanism (9) to transport the material in the first cleaning chamber (14b) to the second cleaning chamber (14c). The drive mechanism (9) includes a drive motor (91) and a transmission shaft (92) connected to the power output end of the drive motor (91). A driven shaft (95) connected to the support column (94) is provided above the transmission shaft (92). The transmission shaft (92) and the driven shaft (95) are connected in a driving connection. The end of the driven shaft (95) away from the support column (94) passes through the side wall of the casing (1) and is connected in a driving connection to the stirring shaft (98) provided in the first cleaning chamber (14b). The stirring shaft (98) is provided with stirring blades at its lower end.

9. A method for pretreating plastic raw materials, characterized in that, This method is implemented using the plastic raw material pretreatment equipment described in any one of claims 1 to 8, and includes the following steps: Step S1: Use a magnetic plate to adsorb metal impurities in the plastic granules and collect the adsorbed impurities into a recycling box. In step S2, the plastic granules are conveyed to the cleaning section by vibration from the feeding section. During the vibration feeding process, when the plastic granules pass through the stepped screen plate, the powder is discharged from the powder discharge port or the powder discharge port and the gap under the action of the vibration mechanism and the dust suction fan. In step S3, the plastic granules fall from the outlet of the feeding section into the first cleaning chamber through the feeding channel for initial cleaning. After the initial cleaning is completed, they are sent to the second cleaning chamber for secondary spray cleaning.

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