A plastic film recycling process

Abstract

This invention relates to a plastic film recycling process, comprising the following steps: S1 screening for impurity removal; S2 crushing; S3 initial dry rubbing for impurity removal; S4 centrifugal impurity removal; S5 sorting for impurity removal; and S6 secondary dry rubbing for collection. The plastic film containing impurities recovered by this invention undergoes sequential screening by a screening machine, crushing into blocks by a crusher, and initial dry rubbing by a first dry rubbing machine to remove heavy impurities. Then, it passes through a hydrocyclone separator, a first sorting machine, and a second sorting machine to remove light impurities. Finally, the impurity-removed plastic film undergoes a second dry rubbing by a second dry rubbing machine before being discharged and collected for reuse. The entire process does not require water, thus avoiding water waste and saving water resources. Furthermore, the entire process achieves more thorough and efficient impurity removal, is more automated, saves manpower, and is more convenient to use.

Description

Technical Field

[0001] This invention relates to the field of plastic film recycling and reuse technology, specifically to a plastic film recycling process. Background Technology

[0002] Mulching technology has become an important means to ensure water conservation, stable yields, and high yields in agriculture, playing a significant role in increasing farmers' income, agricultural production, and adjusting the agricultural planting structure. With the widespread application of mulching technology, the advantages of mulch, such as heat preservation, water retention, and fertilizer retention, can be fully utilized, effectively improving land productivity. However, since existing mulch films are mainly made of PE material, they are not easily degraded, and their residue in the soil causes white pollution. Therefore, it is necessary to recycle and dispose of waste mulch films.

[0003] After recycling, waste plastic film contains heavy impurities such as clumps of soil and pebbles, as well as light impurities such as crop residues and crop straw. Currently, plastic film recycling uses water washing and separation technology. First, the plastic film collected from farmland is crushed into blocks by a shredder, and then rinsed in a rinsing tank. During the rinsing process, some denser impurities (such as soil clumps and pebbles) can sink to the bottom of the tank and be separated. The separated plastic film is then dried by a dewatering machine.

[0004] The existing water washing and separation technology has two shortcomings: First, the plastic film usually contains light impurities such as straw. These impurities cannot sink to the bottom of the water and are not easy to separate by rinsing, resulting in incomplete impurity removal and low efficiency. Second, the existing water washing method consumes a lot of water, which wastes water resources. It also cannot achieve continuous automatic control, which is time-consuming, labor-intensive and inconvenient to use. Summary of the Invention

[0005] This invention addresses the shortcomings of existing technologies by providing a plastic film recycling process that eliminates the need for water washing and separation. It efficiently separates impurities such as soil clods, stones, and straw from the plastic film, and features automated control for convenient use and higher efficiency.

[0006] This invention is achieved through the following technical solution: a plastic film recycling process, comprising the following steps:

[0007] S1 Screening and impurity removal: The recovered impurity-containing plastic film is sent to a screening machine for preliminary screening and impurity removal to remove heavy impurities from the plastic film;

[0008] S2 Crushing: The impurity-containing plastic film after screening and impurity removal is sent to the crusher for crushing into impurity-containing plastic film sheets, which reduces the volume of the plastic film and blocky impurities and reduces the area of ​​the plastic film covering the impurities.

[0009] S3 One-time dry rubbing to remove impurities: The impure mulch film is sent into the first dry rubbing machine for one-time dry rubbing to remove impurities. The heavy impurities adhering to the mulch film are removed and discharged by the first dry rubbing machine, forming a mixture of light impurities and mulch film that can flow with the airflow.

[0010] S4 Centrifugal impurity removal: After the first dry rubbing impurity removal, the mixture of light impurities and mulch film is driven by the exhaust airflow provided by the material blower into the cyclone separator for centrifugal impurity removal. During the centrifugation process, the light impurities with greater inertia separate and fall, while the light impurities with less inertia continue to flow and be discharged with the exhaust airflow along with the mulch film.

[0011] S5 Sorting and Impurity Removal: After centrifugal impurity removal, the plastic film and lightweight impurities with less inertia are driven into the sorting unit by the exhaust airflow. The sorting unit sorts and removes the lightweight impurities with less inertia, so that the lightweight impurities are completely separated, while the plastic film continues to flow out with the exhaust airflow.

[0012] S6 Secondary Dry Scrubbing Collection: After sorting and impurity removal, the plastic film enters the material blower under the drive of the exhaust airflow. The airflow from the material blower sends the plastic film into the second dry scrubbing machine for secondary dry scrubbing before it is discharged and collected. The secondary dry scrubbing further ensures that the plastic film is no longer mixed with any impurities, guaranteeing the impurity removal effect.

[0013] In this process, the impurity-laden plastic film first undergoes preliminary screening using a screening machine. Approximately 70% of easily separable heavy impurities, such as clods of soil and stones, are removed during this initial screening. Then, a crusher shears and breaks the film after the initial screening, producing impurity-laden film sheets. Because the sheet sheets are small, the area covered by the film is reduced, making them easier to unfold during the subsequent dry-rubbing process, thus facilitating the separation of heavy impurities. Furthermore, the broken film sheets are more dispersed and less prone to clumping during the rubbing process. Each sheet can fully contact and rub against the dry-rubbing mechanism, resulting in better and more efficient impurity removal. Additionally, the lighter weight of the film sheets makes them easier to extract with the subsequent airflow after the heavy impurities are separated, enabling the separation of lighter impurities. The plastic film containing impurities is first dry-rubbed in a first dry-rubbing machine to separate the heavy impurities that are difficult to separate, resulting in a thin plastic film and a mixture of lightweight impurities such as crop residues and crop straw. A material fan provides airflow to the cyclone separator and sorting unit, drawing the lightweight impurities and plastic film into the cyclone separator. Because the lightweight impurities are heavier than the plastic film, a large portion of the lightweight impurities with greater inertia are thrown against the separator wall by centrifugal force, thus losing inertia and falling downwards, achieving separation. The remaining small amount of lightweight impurities with less inertia and the plastic film continue to be carried by the airflow into the sorting unit for further separation, achieving complete removal of the lightweight impurities. Finally, only the plastic film remains, carried by the airflow to the material fan and then by the air supply to the second dry-rubbing machine for a second dry-rubbing before being discharged and collected for reuse. This second dry-rubbing further ensures that no impurities are mixed in, guaranteeing the impurity removal effect. This process requires no water throughout the entire impurity removal process, thus avoiding water waste and saving water resources. The process sequentially separates and removes heavy and light impurities from start to finish, resulting in more thorough and efficient impurity removal.

[0014] As an optimization, the inlet of the screening machine is connected to a first conveyor, the outlet of the screening machine is connected to the inlet of the crusher via a second conveyor, and the outlet of the crusher is connected to the inlet of the first dry-rubbing machine via a third conveyor. In this optimized solution, personnel only need to place the impurity-laden plastic film on the first conveyor. The screening machine, crusher, and first dry-rubbing machine automatically transport materials via conveyors. The first dry-rubbing machine, cyclone separator, sorting unit, and second dry-rubbing machine are driven by the airflow provided by a material blower, causing the materials to flow backward. Therefore, the entire process requires no manual intervention; the materials can automatically move backward for corresponding operations, resulting in a higher degree of automation, saving manpower and resources, and making it more convenient to use.

[0015] As an optimization, the sorting unit includes a first sorter and a second sorter. The outlet of the cyclone separator is connected to the inlet of the first sorter via a second duct. The outlet of the first sorter is connected to the inlet of the second sorter via a third duct. The outlet of the second sorter is connected to the inlet of the material blower via a fourth duct. This optimized sorting unit uses two sorters to separate and remove small amounts of lightweight impurities with low inertia. The two-stage sorting ensures complete separation of lightweight impurities, improving the impurity removal effect.

[0016] As an optimization, both the first and second sorting machines include a sorting box. The sorting box has an air inlet on its side wall and an air outlet on its top. Multiple guide plates are staggered on the inner walls of opposite sides of the sorting box, located between the air inlet and outlet. In this optimized design, lightweight debris and plastic film with low inertia enter the sorting box and flow vertically under the influence of the suction airflow. During the upward flow, they pass through multiple guide plates. Since the weight of the lightweight debris is still greater than the weight of the plastic film, the lightweight debris loses its inertia upon hitting the guide plates and falls downwards under its own weight, while the lighter plastic film continues to flow upwards with the airflow and is discharged from the outlet.

[0017] As an optimization, the outlet of the material blower is connected to the inlet of the second dry rubbing machine via a pressure relief pipe. This optimization avoids excessive air pressure from the material blower, which could blow the plastic film directly out of the second dry rubbing machine and thus negate the secondary dry rubbing effect.

[0018] As an optimization, both the first and second dry-rubbing machines include a frame, a dry-rubbing box fixed on the frame, and a rubbing mechanism. The dry-rubbing box has a U-shaped structure and extends horizontally. Both horizontal ends and the top of the dry-rubbing box are closed. A discharge hole is provided at the bottom of the dry-rubbing box. An inlet and an outlet are respectively provided at both ends of the dry-rubbing box. The rubbing mechanism includes a rotating shaft rotatably disposed inside the dry-rubbing box. The rotating shaft extends along the length of the dry-rubbing box, and a spiral rubbing plate is arranged around the outer wall of the rotating shaft. The outer diameter of the spiral rubbing plate is adapted to the inner diameter of the dry-rubbing box. In this optimized solution, the impurity-laden mulch film enters the dry-rubbing box through the inlet. The spiral rubbing plate rotates and drives the impurity-laden mulch film to move towards the outlet. While moving, the spiral rubbing plate rubs and kneads the impurity-laden mulch film, causing the soil clods and stones wrapped inside the mulch film to peel off. The soil clods adhering to the mulch film also fall off during the rubbing process and are discharged from the discharge hole, thereby completely separating the heavy impurities.

[0019] As an optimization, multiple axial rubbing plates are evenly distributed circumferentially on the rotating shaft. These axial rubbing plates extend along the length of the rotating shaft and are connected to the spiral rubbing plates. In this optimized design, the axial rubbing plates perform transverse rubbing, improving rubbing efficiency and effect, thereby enhancing the separation of heavy impurities.

[0020] As an optimization, the height of the axial rubbing plate is less than the height of the spiral rubbing plate. This optimization allows the spiral rubbing plate to contact the impurity-containing mulch film, thereby driving the impurity-containing mulch film to move.

[0021] As an optimization, the screening machine and the crusher are respectively connected to dust collectors via a first dust discharge pipe and a second dust discharge pipe. This optimized solution uses dust collectors to absorb the dust generated by the screening machine and the crusher during operation, preventing dust from overflowing and protecting the working environment.

[0022] The beneficial effects of this invention are as follows: The impurity-laden plastic film is sequentially screened by a screening machine, crushed into blocks by a crusher, and then subjected to a first dry-rubbing machine for impurity removal, thus removing heavy impurities. It then passes through a hydrocyclone separator, a first separator, and a second separator to remove light impurities. Finally, the impurity-removed film is subjected to a second dry-rubbing machine before being discharged and collected for reuse. The entire process requires no water, thus avoiding water waste and saving water resources. The entire process achieves more thorough and complete impurity removal, higher efficiency, and a higher degree of automation, saving manpower and making it more convenient to use. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the process flow of the present invention;

[0024] Figure 2 This is a schematic diagram of the production line for the present invention;

[0025] Figure 3 This is a schematic diagram of the internal structure of the sorting box;

[0026] Figure 4 This is a front view of the internal structure of the dry washing box;

[0027] Figure 5 This is a side view of the internal structure of the dry washing box;

[0028] Figure 6 Top view of the inside of the dry washing box

[0029] As shown in the figure:

[0030] 1. Screening machine; 2. Crusher; 3. First dry rubbing machine; 4. Cyclone separator; 5. Sorting unit; 51. First sorting machine; 52. Second sorting machine; 6. Material fan; 7. Second dry rubbing machine; 8. First conveyor; 9. Second conveyor; 10. Third conveyor; 11. Pressure relief pipe; 12. First dust discharge pipe; 13. Dust collector; 14. Second dust discharge pipe; 15. First air duct; 16. Second air duct; 17. Third air duct; 18. Fourth air duct; 53. Sorting box; 54. Guide plate; 101. Frame; 102. Dry rubbing box; 103. Rotating shaft; 104. Spiral rubbing plate; 105. Axial rubbing plate; 106. Impurity discharge hole; 107. Rubbing protrusions. Detailed Implementation

[0031] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0032] like Figures 1-6 As shown, a plastic film recycling process includes the following steps:

[0033] S1 Screening and impurity removal: The recovered impurity-containing plastic film is sent to screening machine 1 for preliminary screening and impurity removal to remove heavy impurities from the impurity-containing plastic film;

[0034] S2 Crushing: The impurity-containing plastic film after screening and impurity removal is sent to crusher 2 for crushing into impurity-containing plastic film sheets, which reduces the volume of plastic film and blocky impurities and reduces the area of ​​plastic film covering impurities.

[0035] S3 One-time dry rubbing to remove impurities: The impure mulch film is sent into the first dry rubbing machine 3 for one-time dry rubbing to remove impurities. The heavy impurities adhering to the impure mulch film are removed and discharged by the first dry rubbing machine 3, forming a mixture of light impurities and mulch film that can flow with the airflow.

[0036] S4 Centrifugal impurity removal: After the first dry rubbing impurity removal, the mixture of light impurities and mulch film is driven by the exhaust airflow provided by the material blower 6 into the cyclone separator 4 for centrifugal impurity removal. During the centrifugation process, the light impurities with greater inertia separate and fall, while the light impurities with less inertia continue to flow and be discharged with the exhaust airflow along with the mulch film.

[0037] S5 Sorting and Impurity Removal: After centrifugal impurity removal, the plastic film and lightweight impurities with less inertia are driven into the sorting unit 5 by the exhaust airflow. The sorting unit 5 sorts and removes the lightweight impurities with less inertia, so that the lightweight impurities are completely separated, while the plastic film continues to flow out with the exhaust airflow.

[0038] S6 Secondary Dry Scrubbing Collection: After sorting and impurity removal, the plastic film enters the material blower 6 under the drive of the exhaust airflow. The airflow from the material blower 6 sends the plastic film sheet into the second dry scrubbing machine 7 for secondary dry scrubbing treatment before being discharged and collected. The secondary dry scrubbing further ensures that the plastic film is no longer mixed with any impurities, guaranteeing the impurity removal effect.

[0039] The recycling process of this invention is used to remove impurities from agricultural plastic film recovered from farmland. The impurities include the plastic film, heavy impurities mixed in with the plastic film, and light impurities. Heavy impurities include soil clumps adhering to the plastic film and stones encased in the plastic film, while light impurities include crop residues and straw encased in the plastic film.

[0040] Specifically, the feed inlet of the screening machine 1 is connected to the first conveyor 8, the discharge outlet of the screening machine 1 is connected to the feed inlet of the crusher 2 through the second conveyor 9, and the discharge outlet of the crusher 2 is connected to the feed inlet of the first dry rubbing machine 3 through the third conveyor 10.

[0041] During operation, the impurity-laden plastic film recovered in step S1 is fed into screening machine 1 via the first conveyor 8 for preliminary screening and impurity removal. In step S2, the impurity-laden plastic film after screening and impurity removal is fed into crusher 2 via the second conveyor 9 for crushing. In step S3, the impurity-laden plastic film sheets are fed into the first dry-rubbing machine 3 via the third conveyor 10 for a first dry-rubbing impurity removal. After the preliminary operation is completed, the film can be automatically conveyed backward without manual intervention, greatly improving the degree of automation.

[0042] Specifically, the sorting unit 5 includes a first sorting machine 51 and a second sorting machine 52. In this embodiment, the discharge port of the first dry rubbing machine 3 is connected to the air inlet of the cyclone separator 4 through a first air duct 15, the air outlet of the cyclone separator 4 is connected to the air inlet of the first sorting machine 51 through a second air duct 16, the air outlet of the first sorting machine 51 is connected to the air inlet of the second sorting machine 52 through a third air duct 17, and the air outlet of the second sorting machine 52 is connected to the air inlet of the material blower 6 through a fourth air duct 18.

[0043] The first dry rubbing machine 3, cyclone separator 4, first separator 51, second separator 52, and material blower 6 are connected sequentially through various air ducts. During operation, the material blower 6 at the tail end draws air, and the airflow flows from the discharge port of the first dry rubbing machine 3 through the first air duct 15, cyclone separator 4, second air duct 16, first separator 51, third air duct 17, second separator 52, and fourth air duct 18 before flowing into the material blower 6, thereby realizing the extraction and conveying of the mulch film and light impurities after one dry rubbing and impurity removal.

[0044] Specifically, the air outlet of the material blower 6 is connected to the inlet of the second dry rubbing machine 7 through a pressure relief pipe 11. The pressure relief pipe 11 reduces the pressure of the airflow to prevent the airflow output by the material blower from being too high and blowing the mulch film directly out of the second dry rubbing machine, thus losing the secondary dry rubbing effect.

[0045] The screening machine 1 described in this embodiment is a drum screener. During the rotation of the drum screener, the drum drives the impurity-containing plastic film to tumble, thereby separating the heavy impurities such as soil clods and stones that are easy to separate from the impurity-containing plastic film, resulting in a better screening effect.

[0046] Preferably, the screening machine 1 and the crusher 2 are connected to a dust collector 13 via a first dust discharge pipe 12 and a second dust discharge pipe 14, respectively. During operation, the screening machine 1 and the crusher 2 generate a large amount of dust. The dust collector 13's suction fan absorbs and removes the dust from inside the screening machine 1 and the crusher 2, preventing dust from overflowing and protecting the working environment.

[0047] In this embodiment, the first sorting machine 51 and the second sorting machine 52 have the same structure. Both the first sorting machine 51 and the second sorting machine 52 include a sorting box 53. The middle of the side wall of the sorting box 53 is provided with an air inlet, and the top of the sorting box 53 is provided with an air outlet. Multiple guide plates 54 are staggered on the inner walls of opposite sides of the sorting box 53, and the multiple guide plates 54 are located between the air inlet and the air outlet. After lightweight debris and mulch film enter the sorting box, they flow upward under the drive of the exhaust airflow. Due to the staggered distribution of the guide plates, the lightweight debris and mulch film swing left and right during the upward process and collide with each layer of guide plates. Through the collision, the debris adhering to the mulch film is shaken off. After colliding with the guide plates, the debris falls downward, while the mulch film continues to flow upward with the airflow and is discharged from the air outlet.

[0048] In this embodiment, both the first dry-rubbing machine 3 and the second dry-rubbing machine 7 include a frame 101, a dry-rubbing box 102 fixed on the frame 101, and a kneading mechanism. The dry-rubbing box 102 has a U-shaped structure and extends horizontally. Both horizontal ends and the top of the dry-rubbing box 102 are closed. The bottom of the dry-rubbing box 102 has a waste discharge hole 106. The two ends of the dry-rubbing box 102 are respectively provided with a feed inlet and a discharge outlet. The kneading mechanism includes a rotating shaft 103 rotatably disposed inside the dry-rubbing box 102. The rotating shaft 103 extends along the length of the dry-rubbing box 102. A drive motor for driving the rotating shaft 103 to rotate is provided on the outer wall of the dry-rubbing box 102. A spiral kneading plate 104 is arranged around the outer wall of the rotating shaft 103. The outer diameter of the spiral kneading plate 104 is adapted to the inner diameter of the dry-rubbing box 102. Multiple axial kneading plates 105 are evenly distributed circumferentially on the rotating shaft 103. The axial kneading plates 105 extend along the length of the rotating shaft 103 and are connected to the spiral kneading plate 104. The height of the axial kneading plates 105 is less than the height of the spiral kneading plate 104. In this embodiment, the bottom inner wall of the dry kneading box 102 is also provided with kneading protrusions 107 to improve the kneading effect.

[0049] The rotating shaft is driven by a drive motor, which causes the spiral rubbing plate 104 to move the impurity-containing mulch film at the bottom of the dry rubbing box 102 toward the discharge port. During the movement, the spiral rubbing plate 104 and the axial rubbing plate 105 work together with the rubbing protrusions 107 at the bottom of the dry rubbing box to rub and knead the impurity-containing mulch film, causing the mulch film to unfold. The stones wrapped in the mulch film are peeled off, and the soil clods adhering to the mulch film are also crushed and removed during the rubbing process and discharged from the discharge hole, thereby separating the heavy impurities.

[0050] Working principle: The impurity-containing plastic film is first screened by screening machine 1. About 70% of the heavy impurities that are easy to separate in the impurity-containing plastic film can be removed by the preliminary screening.

[0051] Then, the impurity-laden plastic film after initial screening is sheared and crushed by crusher 2 to obtain impurity-laden plastic film sheets. Because the blocky impurity-laden plastic film is small in volume, the area covered by the film for impurities is reduced, making it easier to unfold during subsequent kneading in the first dry-rubbing machine 3, thus facilitating the separation of internal soil clods and stones. Furthermore, the crushed impurity-laden plastic film is more dispersed and less prone to clumping during kneading, allowing each sheet to fully contact and knead with the kneading mechanism of the first dry-rubbing machine 3. Therefore, the dry-rubbing impurity removal effect is better and more efficient. Moreover, because the impurity-laden plastic film sheets are lighter, they are more easily extracted by the subsequent exhaust airflow after the heavy impurities are separated, enabling the subsequent separation of light impurities.

[0052] The plastic film containing impurities is rubbed once by the first dry rubbing machine 3, which completely separates the heavy impurities, leaving only light impurities such as crop residues and crop straw, and the plastic film.

[0053] The material fan 6 provides airflow to the cyclone separator 4 and the sorting unit 5, which in turn carries the light debris and the mulch film into the cyclone separator 4. Since the weight of the light debris is greater than that of the mulch film, a large part of the heavier light debris is thrown towards the wall of the separator under centrifugal force, and thus loses inertial force and falls downward to achieve separation.

[0054] The remaining small amount of lightweight debris and the plastic film sheets continue to enter the sorting unit 5 with the exhaust airflow for further separation, achieving complete separation and removal of lightweight debris. Finally, only the plastic film sheets are sent to the material blower 6 with the exhaust airflow, and then sent to the second dry rubbing machine 7 by the airflow. After being dry rubbing twice, the plastic film sheets are discharged and collected for reuse.

[0055] Of course, the above description is not limited to the examples above. Technical features not described in this invention can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solutions of this invention and are not intended to limit this invention. This invention has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this invention do not depart from the spirit of this invention and should also fall within the scope of protection of the claims of this invention.

Claims

1. A mulch film recycling process, characterized by, The method comprises the following steps: S1: screening and removing impurities: the recovered mulch containing impurities is sent to a screening machine (1) for preliminary screening and removing impurities to screen out heavy impurities in the mulch containing impurities; S2: crushing: the mulch containing impurities after the screening and removing impurities is sent to a crusher (2) for crushing treatment into mulch pieces, so that the volume of the mulch and the blocky impurities is reduced, and the wrapping area of the mulch on the impurities is reduced; S3: first dry rubbing and removing impurities: the mulch pieces containing impurities are sent to a first dry rubbing machine (3) for first dry rubbing and removing impurities, the heavy impurities adhered to the mulch pieces are separated and discharged by rubbing and kneading of the first dry rubbing machine (3), and a mixture of light impurities and the mulch pieces that can flow with the airflow is formed; S4: centrifugal removing impurities: the mixture of the light impurities and the mulch pieces after the first dry rubbing and removing impurities is driven by the suction airflow provided by a material fan (6) into a cyclone separator (4) for centrifugal removing impurities, the light impurities with large inertia are separated and fall, and the light impurities with small inertia and the mulch pieces continue to flow and are discharged with the suction airflow; S5: separating and removing impurities: the mulch and the light impurities with small inertia after the centrifugal removing impurities are driven by the suction airflow into a separator set (5), the light impurities with small inertia are separated and removed by the separator set (5), and the mulch pieces continue to flow and are discharged with the suction airflow; S6: second dry rubbing and collecting: the mulch after the separating and removing impurities is driven by the suction airflow into the material fan (6), the mulch pieces are sent into a second dry rubbing machine (7) by the air supply airflow of the material fan (6) for second dry rubbing treatment and then discharged and collected, the mulch is further ensured not to mix with any impurities after the second dry rubbing, and the effect of removing impurities is ensured; In steps S3 and S6, the first dry rubbing machine (3) and the second dry rubbing machine (7) each comprise a rack (101), a dry rubbing box (102) fixed on the rack (101), and a rubbing mechanism, the dry rubbing box (102) is in a U-shaped structure and extends in a horizontal direction, the horizontal two ends and the top of the dry rubbing box (102) are closed, the bottom of the dry rubbing box (102) is provided with a discharge hole (106), and the two ends of the dry rubbing box (102) are respectively provided with a feeding port and a discharging port, the rubbing mechanism comprises a rotating shaft (103) rotatably arranged in the dry rubbing box (102), the rotating shaft (103) extends along the length direction of the dry rubbing box (102), and a spiral rubbing plate (104) is arranged on the outer wall of the rotating shaft (103), the outer diameter of the spiral rubbing plate (104) is matched with the inner diameter of the dry rubbing box (102).

2. The mulching film recycling process according to claim 1, characterized in that: The feeding port of the screening machine (1) is connected with a first conveyor (8), the discharging port of the screening machine (1) is connected with the feeding port of the crusher (2) through a second conveyor (9), and the discharging port of the crusher (2) is connected with the feeding port of the first dry rubbing machine (3) through a third conveyor (10).

3. The mulching film recycling process according to claim 1, characterized in that: The sorting machine group (5) comprises a first sorting machine (51) and a second sorting machine (52), the air outlet of the cyclone separator (4) is connected with the air inlet of the first sorting machine (51) through a second air pipe (16), the air outlet of the first sorting machine (51) is connected with the air inlet of the second sorting machine (52) through a third air pipe (17), and the air outlet of the second sorting machine (52) is connected with the air inlet of the material fan (6) through a fourth air pipe (18).

4. The mulching film recycling process according to claim 3, characterized in that: The first sorting machine (51) and the second sorting machine (52) each comprise a sorting box (53), the middle part of the side wall of the sorting box (53) is provided with an air inlet, the top of the sorting box (53) is provided with an air outlet, and a plurality of guide plates (54) are distributed on the inner walls of the opposite sides of the sorting box (53) in a staggered manner and are located between the air inlet and the air outlet.

5. The mulching film recycling process according to claim 1, wherein: The air outlet of the material fan (6) is connected with the feeding port of the second dry rubbing machine (7) through a pressure relief pipeline (11).

6. The mulching film recycling process according to claim 1, wherein: A plurality of axial rubbing plates (105) are uniformly distributed on the rotating shaft (103) in the circumferential direction, the axial rubbing plates (105) extend along the length direction of the rotating shaft (103) and are connected with the spiral rubbing plates (104).

7. The mulching film recycling process according to claim 6, characterized in that: The height of the axial rubbing plate (105) is less than the height of the spiral rubbing plate (104).

8. The mulching film recycling process according to claim 1, wherein: The screening machine (1) and the crusher (2) are connected with a dust remover (13) through a first dust removal pipe (12) and a second dust removal pipe (14) respectively.

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