Waste mulching film separation system

Abstract

The invention relates to the technical field of waste mulching film recovery, and particularly discloses a waste mulching film separation system. Comprising a primary crusher, a primary screening device, a primary separator, a primary fan, a secondary screening device, a secondary separator, a dust removal device, a recovery fan, a recovery cyclone separator and an air lock valve, a mulching film in soil is intercepted in a first-stage screen drum by the first-stage screening device and is sent out through a first-stage fan, straw is separated from screen underflow through the second-stage screening device, then the screen underflow is sent out through a discharging opening in the bottom of a second-stage separator, and residual soil is discharged from the bottom of the second-stage screening device; straws and mulching films are separated independently and can be recycled respectively, so that economic benefits are increased; the negative pressure state is kept in the first-stage screen drum, the recovery rate of the mulching film by the first-stage separator can be increased, the straw and the mulching film are separated again by the second-stage separator, the quantity of the mulching film hung on the discharged straw can be reduced, and the recovery rate of the mulching film is further increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waste mulch recycling, and particularly relates to a waste mulch separation system. BACKGROUND

[0002] In the northern arid region, the evaporation is large, and the soil has poor water and heat preservation capacity. Laying mulch can significantly improve the soil temperature, maintain the soil humidity, and improve the survival rate of crops. Meanwhile, the water vapor circulation formed in the micro environment under the mulch can avoid soil compaction. However, the mulch is easily broken after a long time of exposure to the sun and weathering, and a large amount of mulch is mixed into the soil after the crops are harvested, forming waste mulch garbage pollution.

[0003] The waste mulch residue causes serious harm to agricultural production and ecological environment. In agricultural production, it hinders crop growth, leads to yield reduction, reduces soil quality, and increases farming costs. In terms of ecological environment, it pollutes the soil and water system for a long time, endangers biological safety, and destroys the landscape and ecological balance. Therefore, it is urgent to prevent and control waste mulch pollution by scientifically using thickened or degradable mulch, mechanical recycling, and classified disposal.

[0004] In the prior art, the wind separation method is often used to separate materials with different specific gravities. The soil polluted by the mulch is mixed with a large amount of mulch and crop straw. Since the specific gravities of the components are quite different, the above separation method is suitable. For example, a separation device for recycling and regenerating waste mulch disclosed in Chinese patent CN118650780A separates the mulch in the soil. The device breaks the straw and mulch in the soil into appropriate sizes by a breaking cylinder, separates the mulch from the mixture of soil, straw and mulch by air flow, and sends the light mulch into a secondary screening device by air flow. The heavier straw and soil fall to the bottom and are sent out as the discharge. The device mainly relies on the secondary screening device to separate the mulch. The secondary screening device mainly relies on the screen to intercept, and the screen needs to be cleaned constantly. The structure is complex, the reliability is low, and the working efficiency is poor. The processing capacity is also small, and the processing efficiency is low.

[0005] In addition, after the straw is broken, it is easy to be entangled with the mulch fragments. When the wind separation method is used, the mulch entangled on the straw cannot be separated and is thus sent out from the bottom together with the soil, resulting in a large amount of mulch entangled on the straw mixed in the discharged soil, and a large amount of mulch residue in the discharge, and poor separation effect. SUMMARY

[0006] The present application aims to provide a waste mulch separation system to solve the problems in the prior art.

[0007] The present invention is implemented by the following technical scheme: a waste film separation system, including a primary crusher, a primary screening device, a primary separator, a primary fan, a secondary screening device, a secondary separator and a recovery cyclone separator, the outlet of the primary crusher is connected to the feed end of the first conveyor, the discharge end of the first conveyor is connected to the feed hopper of the primary screening device, the heavy outlet at the bottom of the primary screening device is connected to the feed end of the second conveyor, the discharge end of the second conveyor is connected to the feed hopper of the secondary screening device, and the light outlet of the primary screening device is connected to the feed port of the primary separator. The drop port at the bottom of the first-stage separator is connected to the feed end of the second conveyor, the air outlet at the top of the first-stage separator is connected to the inlet of the first-stage fan, the outlet of the first-stage fan is connected to the ground film collection trough, the light outlet at the top of the second-stage screening device is connected to the feed port of the second-stage separator, the air outlet at the top of the second-stage separator is connected to the inlet of the recovery cyclone separator, the discharge port at the bottom of the recovery cyclone separator is connected to the feed end of the first conveyor, the heavy outlet of the second-stage screening device is sent to the soil recovery trough through a conveyor belt, and the drop port at the bottom of the second-stage separator is sent to the straw processing trough through a conveyor belt.

[0008] Furthermore, the first-stage screening device has the same structure as the second-stage screening device, including an outer shell, a crushing and screening mechanism, a feed hopper and a discharge auger. The crushing and screening mechanism is fixedly arranged in the outer shell, a feed hopper connected to the crushing and screening mechanism is arranged on the top of the outer shell, a discharge auger is arranged in the outer shell and below the crushing and screening mechanism, and a heavy outlet is opened at one end of the discharge auger at the bottom of the outer shell.

[0009] Furthermore, the crushing and screening mechanism includes a screen drum, a crushing roller and a crushing motor. One end of the screen drum is connected to the feed hopper, and the other end of the screen drum is provided with a light outlet, which is connected to the feed port of the first-stage separator. Screen holes are provided circumferentially on the screen drum, and a crushing roller is provided coaxially rotating inside the screen drum. A crushing motor is fixedly installed on the frame of the outer shell, and the output shaft of the crushing motor is transmission-connected to the crushing roller.

[0010] Furthermore, the crushing roller includes a roller body and spiral blades, crushing teeth and flipping plates fixed on the roller body. A spiral blade is provided on the roller body at a position corresponding to the feed hopper on the screen drum, and a plurality of flipping plates are provided along the circumferential direction on the roller body at a position corresponding to the discharge end of the screen drum. The end edge of the flipping plate is fitted with a gap between the end edge of the flipping plate and the inner wall of the screen drum. A plurality of crushing teeth are spirally arranged along the outer wall of the roller body on the roller body between the spiral blade and the flipping plate.

[0011] Furthermore, the sieve holes of the first-stage screening device are elliptical, with a major axis of 140-180 mm and a minor axis of 100-130 mm; The sieve holes of the secondary screening device are circular holes with a diameter of 3-5 mm and a spacing of 2-4 mm between each sieve hole.

[0012] Furthermore, a dust removal port is provided on the top of the shell of the secondary screening device, and the dust removal port is connected to the inlet of the dust removal device through a pipeline.

[0013] Furthermore, two crushing and screening mechanisms are arranged side by side in the shell of the first-level screening device, the feed hopper is connected to the screen cylinders of the two crushing and screening mechanisms at the same time, each screen cylinder is connected to a first-level separator, and a discharge auger is provided under each crushing and screening mechanism.

[0014] Furthermore, the first-stage separator has the same structure as the second-stage separator, including a shell, a flap, a rotating shaft and a handle. A feed port is provided on one side of the shell, an air outlet is provided on the top of the shell, a drop port is provided at the bottom of the shell, a slide is provided at an angle in the shell below the feed port, a flap is provided in the shell on the opposite side above the slide, a rotating shaft is fixed on one end of the flap, both ends of the rotating shaft pass through the side walls of the shell and fit tightly with the shell, and a handle is fixedly installed on one end of the rotating shaft on the outside of the shell.

[0015] Furthermore, it also includes a transfer platform vehicle, on which the primary crusher, the first-level screening device, the first-level separator, the first-level fan, the second-level screening device, the second-level separator and the recovery cyclone separator are installed.

[0016] Advantages of the present invention: 1. The ground film and the straw are separated in sequence by the first-stage screening device and the second-stage screening device. The straw and the ground film can be separated and recycled separately, thereby improving the economic benefits of recycling.

[0017] 2. The ground film mixed in the soil is fully separated by the principle of wind flotation through the first-level screening device and the first-level separator. Maintaining a negative pressure in the first-level screen drum of the first-level screening device can reduce the probability of the ground film being mixed into the undersize material from the first-level screen drum, greatly improving the recovery rate of the ground film by the first-level separator.

[0018] 3. The secondary separator uses the principle of wind flotation to separate the straw and the ground film again, so that the ground film attached to the crushed straw is separated by airflow in the secondary separator, and then sent back to the primary screening device through the recovery fan and the recovery cyclone separator, which can reduce the amount of ground film attached to the discharged straw and improve the ground film recovery rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 It is a structural diagram of the first-stage screening device.

[0021] Figure 3 This is a structural cross-sectional view of the first-stage screening device.

[0022] Figure 4 This is an exploded diagram of the structure of the first-stage screen drum and the first-stage crushing roller.

[0023] Figure 5 It is a structural cross-sectional view of a first-stage separator or a second-stage separator.

[0024] Figure 6 It is a structural diagram of the secondary screening device.

[0025] Figure 7 This is a structural cross-sectional view of the secondary screening device.

[0026] In the figure: 1. Primary crusher; 2. First-stage screening device; 3. First-stage separator; 4. First-stage fan; 5. Second-stage screening device; 6. Second-stage separator; 7. Dust removal device; 8. Recovery cyclone separator; 201. Casing; 202. Feed hopper; 203. Discharge auger; 204. Screen drum; 2041. Screen hole; 205. Crushing roller; 2051. Spiral blade; 2052. Crushing teeth; 2053. Flip plate; 206. Crushing motor; 207. Light weight outlet; 208. Heavy weight outlet; 301. Casing; 302. Flip plate; 303. Rotating shaft; 304. Handle; 305. Feed inlet; 306. Air outlet; 307. Dropping port; 308. Slide plate. DETAILED DESCRIPTION

[0027] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] like Figure 1-Figure 3As shown: A waste film separation system includes a primary crusher 1, a primary screening device 2, a primary separator 3, a primary fan 4, a secondary screening device 5, a secondary separator 6 and a recovery cyclone separator 8. The outlet of the primary crusher 1 is connected to the feed end of the first conveyor, the discharge end of the first conveyor is connected to the feed hopper 202 of the primary screening device 2, the heavy outlet 208 at the bottom of the primary screening device 2 is connected to the feed end of the second conveyor, the discharge end of the second conveyor is connected to the feed hopper 202 of the secondary screening device 5, the light outlet 207 of the primary screening device 2 is connected to the feed port 305 of the primary separator 3, and the bottom of the primary separator 3 is connected to the feed port 306 of the secondary screening device 5. The drop-out port 307 at the top is connected to the feed end of the second conveyor, the air outlet 306 at the top of the first-stage separator 3 is connected to the inlet of the first-stage fan 4, and the outlet of the first-stage fan 4 is connected to the mulch collection trough. When processing soil containing mulch, it is necessary to first use a forklift to collect 20cm thick soil on the surface of the field, and then perform preliminary processing through the block cutter to make soil materials of about 20cm-40cm square, and then transport them to the primary crusher 1 for primary crushing through a grabber. The primary crusher 1 adopts a disc crusher with a high-speed rotating breaker hammer in the disc crusher to break up the fed soil. The discharge port of the primary crusher 1 is through the The conveyor is connected to the feed hopper 202 of the first-level screening device 2, and the soil sent out from the primary crusher 1 is sent to the first-level screening device 2. The first-level screening device 2 mainly separates most of the residual film in the soil. The heavy outlet 208 at the bottom of the first-level screening device 2 screens the soil and straw. The light outlet 207 on the top of the first-level screening device 2 is mainly for most of the film and part of the soil and straw. The air outlet 306 on the top of the first-level separator 3 is connected to the inlet of the first-level fan 4. The negative pressure generated by the first-level fan 4 draws most of the mixed soil and straw at the light outlet 207 on the top of the first-level screening device 2 into the first-level separator 3. The bottom discharge port 307 of the separator 3 is connected to the feed hopper 202 of the secondary screening device 5 through a conveyor. The negative pressure in the first-level separator 3 is generated by the first-level fan 4. Part of the incoming air comes from the first-level screening device 2, and the other part comes from the bottom discharge port 307 of the first-level separator 3. The mulch mixed with soil and straw is floated by the wind in the first-level separator 3, and the heavier soil and straw are sent out from the bottom discharge port 307 of the first-level separator 3, and the soil and straw screened out from the heavy outlet 208 at the bottom of the first-level screening device 2 are sent to the secondary screening device 5. The lighter mulch is carried away by the airflow, sent out of the system through the first-level fan 4, and sent to the collection tank for briquettes to be uniformly recycled and processed.

[0029] The main function of the secondary screening device 5 is to separate soil and straw. The light outlet 207 on the upper part of the secondary screening device 5 is connected to the feed port 305 of the secondary separator 6, the air outlet 306 at the top of the secondary separator 6 is connected to the inlet of the recovery cyclone separator 8, and the discharge port at the bottom of the recovery cyclone separator 8 is connected to the feed end of the first conveyor. The heavy outlet 208 of the secondary screening device 5 is sent to the soil recovery trough through the conveyor belt, and the drop port 307 at the bottom of the secondary separator 6 is sent to the straw processing trough through the conveyor belt.

[0030] The light discharge port at the top of the secondary screening device 5 is for the screened straw, which is then fed into the secondary separator 6. A dust removal port is provided at the top of the housing 201 of the secondary screening device 5, which is connected to the inlet of the dust removal device 7 via a pipe. Because the secondary screening device requires a large amount of air volume to separate the straw, a large amount of dust in the soil is carried away by the wind. Therefore, a dust removal port is required at the top of the housing 201. The dust removal device 7 includes a dust removal cyclone and a bag dust collector. The fan of the bag dust collector provides negative pressure to carry away the dust generated by the secondary screening device 5.

[0031] The soil entering the secondary screening device 5 is mixed with a large amount of straw and a small amount of ground film entangled with the straw. The function of the secondary separator 6 is mainly to separate the straw and a small amount of ground film. The air outlet 306 at the top of the secondary separator 6 is connected to the inlet of the recovery cyclone separator 8, and the discharge port at the bottom of the recovery cyclone separator 8 is placed at the feed end of the first conveyor, and is connected to the feed hopper 202 of the primary screening device 2 through the first conveyor; the airflow generated by the recovery cyclone separator 8 sends the straw and ground film sent by the secondary screening device 5 to the secondary separator 6 for wind flotation. The heavier straw falls from the drop port 307 of the secondary separator 6, and the lighter ground film is sent to the recovery cyclone separator 8 from the air outlet 306 at the top of the secondary separator 6. After cyclonic separation, the ground film is sent to the primary screening device 2 again. Since the air outlet 306 at the top of the secondary separator 6 recovers not only the ground film but also a large amount of lightweight soil and dust, it can only be sent back to the primary screening device 2 for re-separation of the ground film.

[0032] like Figure 2-Figure 3 、 Figure 6 and Figure 7As shown: the first-stage screening device 2 has the same structure as the second-stage screening device 5, including an outer shell 201, a crushing and screening mechanism, a feed hopper 202 and a discharge auger 203. The crushing and screening mechanism is fixedly provided in the outer shell 201, and a feed hopper 202 connected to the crushing and screening mechanism is provided on the top of the outer shell 201. A discharge auger 203 is provided in the outer shell 201 and below the crushing and screening mechanism. A heavy outlet 208 is provided at one end of the discharge auger 203 at the bottom of the outer shell 201. Soil mixed with mulch and straw is fed from the feed hopper 202 into the crushing and screening mechanism, which includes a screen drum 204, a crushing roller 205, and a crushing motor 206. One end of the screen drum 204 is connected to the feed hopper 202, and the other end of the screen drum 204 is provided with a light-weight outlet 207, which is connected to the feed port 305 of the primary separator 3. Screen holes 2041 are circumferentially provided on the screen drum 204. A crushing roller 205 rotates coaxially within the screen drum 204. A crushing motor 206 is fixedly mounted on the frame of the housing 201, and the output shaft of the crushing motor 206 is in transmission connection with the crushing roller 205. The rotation of the crushing motor 206 drives the crushing roller 205, and the material is crushed by the crushing roller 205 and conveyed toward the light-weight outlet 207. The heavier soil and straw fall from the sieve holes 2041 , and the lighter ground film is first turned over by the crushing roller 205 , and then carried away by the air flow in the sieve drum 204 and sent to the primary separator 3 from the light outlet 207 .

[0033] The crushing roller 205 includes a roller body and a spiral blade 2051 fixed on the roller body, crushing teeth 2052 and a turning plate 2053. The spiral blade 2051 plays a feeding role, and the crushing teeth 2052 crush and separate the ground film and straw in the soil by rotation, driving the lightweight ground film and straw to move upward and separate from the soil. A spiral blade 2051 is provided on the roller body at the corresponding position of the feed hopper 202 on the screen drum 204, and a plurality of turning plates 2053 are provided along the circumferential direction on the roller body at the corresponding position of the discharge end of the screen drum 204. The end edge of the turning plate 2053 is gap-matched with the inner wall of the screen drum 204. A plurality of crushing teeth 2052 are spirally arranged along the outer wall of the roller body between the spiral blade 2051 and the turning plate 2053. The crushing teeth 2052 are spirally arranged, and while crushing and stirring the material, they also serve to assist the material in being transported toward the light outlet 207.

[0034] In this embodiment, the difference between the first-stage screening device 2 and the second-stage screening device 5 mainly lies in the different shapes and sizes of the screen holes 2041. Since the first-stage screening device 2 is at the front end of the system and needs to process a large amount of material, two crushing and screening mechanisms are set.

[0035] The sieve hole 2041 of the first-stage screening device 2 is elliptical, the major axis of the sieve hole 2041 is 140-180 mm, and the minor axis is 100-130 mm. The major axis of the sieve hole 2041 is set in the horizontal direction. When the crushing roller 205 rotates, the material spirally flows along the inner wall of the screen cylinder 204. The sieve hole 2041 of the first-stage screening device 2 is elliptical, which facilitates the soil and straw to pass through the sieve hole 2041 of the first-stage screening device 2; the sieve hole 2041 of the second-stage screening device 5 is a circular hole with a diameter of 3-5 mm. The spacing between each sieve hole 2041 is 2-4 mm. The sieve hole 2041 of the second-stage screening device 5 only allows soil to be screened, and the straw is retained in the sieve cylinder 204.

[0036] A dust removal port 209 is provided on the top of the housing 201 of the secondary screening device 5 , and the dust removal port 209 is connected to the inlet of the dust removal device 7 through a pipeline.

[0037] Two crushing and screening mechanisms are arranged side by side in the outer shell 201 of the first-level screening device 2. The feed hopper 202 is connected to the screen cylinders 204 of the two crushing and screening mechanisms at the same time. Each screen cylinder 204 is connected to a first-level separator 3. A discharge auger 203 is provided under each crushing and screening mechanism.

[0038] like Figure 5 As shown: the first-stage separator 3 has the same structure as the second-stage separator 6, including a shell 301, a flap 302, a rotating shaft 303 and a handle 304. A feed port 305 is provided on one side of the shell 301, an air outlet 306 is provided on the top of the shell 301, and a blanking port 307 is provided at the bottom of the shell 301. A slide 308 is inclinedly provided in the shell 301 below the feed port 305, and a flap 302 is provided in the shell 301 on the opposite side above the slide 308. A rotating shaft 303 is fixed on one end of the flap 302, and both ends of the rotating shaft 303 pass through the side walls of the shell 301 on both sides and are tightly fitted with the shell 301. A handle 304 is fixedly installed on one end of the rotating shaft 303 outside the shell 301. The angle of the flap 302 can be adjusted by rotating the handle 304 to drive the rotating shaft 303 to rotate; the air flow will enter from the feed port 305 and the blanking port 307 respectively, and be sent out from the air outlet 306, and the material flows in the opposite direction of the air flow entering from the bottom blanking port 307. By controlling the angle of the flap 302, the size of the air flow entering from the feed port 305 and the blanking port 307 can be adjusted, thereby controlling the relative flow rate of the material and the air flow. When more light material falls from the blanking port 307, for example, there is more ground film in the blanking port 307 of the first-level separator 3, or there is more dust in the blanking port 307 of the second-level separator 6, it indicates that the air flow entering from the blanking port 307 is less, and it is necessary to increase the air intake by adjusting the angle of the flap 302, so that the lightweight material is carried away with the air flow and sent out from the air outlet 306, and vice versa.

[0039] In addition, it also includes a transfer platform vehicle, on which the primary crusher 1, the first-level screening device 2, the first-level separator 3, the first-level fan 4, the second-level screening device 5, the second-level separator 6 and the recovery cyclone separator 8 are installed. The entire set of equipment can be transported by the transfer platform vehicle to the vicinity of the field that needs to be processed to save the transportation cost of the soil.

[0040] Working principle: The first-level screening device 2 mainly screens out the soil and straw, separates most of the ground film and sends it to the first-level separator 3 to rely on air flow flotation to separate the soil and ground film. However, as the crushing roller 205 crushes and stirs, small pieces of ground film will be entangled with the straw and brought out by the straw. The straw and soil are separated by the second-level screening device 5, where the heavier soil with smaller particles is brought out from the heavy outlet 208 at the bottom, and the lighter straw with larger particles remains in the screen drum 204 of the second-level screening device 5 and is sent to the second-level separator 6 from the light outlet 207. The second-level separator 6 also separates the ground film entangled in the straw through wind flotation. Through two-stage separation processing, the separation efficiency of the ground film is guaranteed, and at the same time, the straw in the soil can be separated separately. The straw can be utilized as a resource, thereby improving the economic benefits of straw recycling.

[0041] In order to illustrate the effect of the waste mulch film separation system provided by the present invention on mulch film separation, three batches of soil samples containing waste mulch films were processed using the system in the above embodiment.

[0042] Three crops grown primarily in the Hetao Irrigation District of Inner Mongolia Autonomous Region were selected: corn, potatoes, and sunflowers. 100 tons of soil each at a depth of 0-20 cm was collected after harvest and plowing. The method of laying mulch film for growing corn, potatoes, and sunflowers in Inner Mongolia Autonomous Region is relatively common, widely used, and representative. Therefore, the land planted with these crops also contains a high amount of residual mulch film. The mulch film was processed in batches using the system of the embodiment of the present invention, and then samples were taken from the separated straw and soil for quantitative analysis of the residual mulch film. The specific analysis method is as follows: The first step is sampling: After the system of the present invention is running stably, the soil sample to be separated is continuously fed into the primary crusher 1, and three samples are taken at the heavy outlet 208 of the secondary screening device 5, with an interval of 5 minutes between each sampling, and 50 kg is taken each time, and the three soil samples are mixed and stirred evenly; When taking soil samples, straw samples were taken at the bottom discharge port 307 of the secondary separator 6 at the same time. 15 kg of straw was taken each time and the three straw samples were mixed and stirred evenly. Then 65 kg of soil samples were taken at random positions in the untreated soil for three times. The three soil samples were combined to obtain the untreated soil sample.

[0043] The second step is screening: The soil samples were sieved through 10mm→6mm→2mm sieves in sequence to separate the residual film and soil. The film fragments remaining on the sieves were manually picked, then placed in a beaker with 500ml of water, soaked and rinsed, and then sieved and dried to obtain the film fragments in the soil.

[0044] The straw sample is first sieved through a 15mm-10mm sieve to separate larger residual films, and then the sieved straw sample is soaked in water for at least 24 hours, and then fully stirred for 1-2 minutes. After most of the straw sample sinks, a 2mm sieve is used to salvage the film fragments on the water surface, and then the above stirring and salvaging steps are repeated 5-6 times. All the collected films are placed in a beaker, 500ml of water is added, soaked and rinsed, and then sieved and dried to obtain film fragments in the straw.

[0045] The untreated soil samples were first manually screened to pick out larger pieces of mulch film, and then sieved through 10mm→6mm→2mm sieves in sequence to separate the residual mulch film and soil. The mulch film fragments remaining on the sieve were manually picked, and the mulch film wrapped around the straw removed in the above screening process was picked off with tweezers. After collecting all the mulch films, they were placed in a beaker, soaked and rinsed with 500ml of water, and then sieved and dried to obtain the mulch film in the untreated soil.

[0046] The third step is to weigh and calculate the residual film: The weight of film fragments in the soil, the weight of film fragments in the straw, and the weight of film in the untreated soil of various crop soil samples were weighed and recorded respectively; the film removal rate was calculated as 1-(weight of film fragments in the soil + weight of film fragments in the straw) / weight of film in the untreated soil × 100%.

[0047]

[0048] According to the above experimental results, the film removal rate in the soil where various crops are planted is higher than 85%, indicating that the device can effectively separate the film from the soil.

[0049] In the description of the present invention, it should be noted that the terms "center", "up", "down", "front", "back", "top", "bottom", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

Claims

1. A waste film separation system, characterized in that: The invention comprises a primary crusher (1), a primary screening device (2), a primary separator (3), a primary fan (4), a secondary screening device (5), a secondary separator (6) and a recovery cyclone separator (8), wherein the outlet of the primary crusher (1) is connected to the feed end of the first conveyor, the discharge end of the first conveyor is connected to the feed hopper (202) of the primary screening device (2), the heavy outlet (208) at the bottom of the primary screening device (2) is connected to the feed end of the second conveyor, the discharge end of the second conveyor is connected to the feed hopper (202) of the secondary screening device (5), the light outlet (207) of the primary screening device (2) is connected to the feed port (305) of the primary separator (3), and the discharge port at the bottom of the primary separator (3) is connected to the feed port (306). (307) is connected to the feed end of the second conveyor, the air outlet (306) at the top of the first-stage separator (3) is connected to the inlet of the first-stage fan (4), the outlet of the first-stage fan (4) is connected to the ground film collection trough, the light outlet (207) at the top of the second-stage screening device (5) is connected to the feed inlet (305) of the second-stage separator (6), the air outlet (306) at the top of the second-stage separator (6) is connected to the inlet of the recovery cyclone separator (8), the discharge port at the bottom of the recovery cyclone separator (8) is connected to the feed end of the first conveyor, the heavy outlet (208) of the second-stage screening device (5) is sent to the soil recovery trough through the conveyor belt, and the discharge port (307) at the bottom of the second-stage separator (6) is sent to the straw processing trough through the conveyor belt.

2. A waste film separation system according to claim 1, characterized in that: The first-stage screening device (2) has the same structure as the second-stage screening device (5), and the first-stage screening device (2) comprises a housing (201), a crushing and screening mechanism, a feed hopper (202), and a discharge auger (203). The crushing and screening mechanism is fixedly provided in the housing (201), a feed hopper (202) connected to the crushing and screening mechanism is provided at the top of the housing (201), a discharge auger (203) is provided inside the housing (201) below the crushing and screening mechanism, and a heavy material outlet (208) is provided at the bottom of the housing (201) at one end of the discharge auger (203).

3. A waste film separation system according to claim 2, characterized in that: The crushing and screening mechanism comprises a screen drum (204), a crushing roller (205) and a crushing motor (206); one end of the screen drum (204) is connected to the feed hopper (202); the other end of the screen drum (204) is provided with a light outlet (207); the light outlet (207) is connected to the feed port (305) of the primary separator (3); screen holes (2041) are provided in the circumferential direction of the screen drum (204); a crushing roller (205) is provided coaxially rotating in the screen drum (204); a crushing motor (206) is fixedly mounted on the frame of the housing (201); and an output shaft of the crushing motor (206) is drivingly connected to the crushing roller (205).

4. A waste film separation system according to claim 3, characterized in that: The crushing roller (205) comprises a roller body and a spiral blade (2051), crushing teeth (2052) and a turning plate (2053) fixed on the roller body. The spiral blade (2051) is provided on the roller body at a position corresponding to the feed hopper (202) on the screen drum (204). A plurality of turning plates (2053) are provided along the circumferential direction on the roller body at a position corresponding to the discharge end of the screen drum (204). The end edge of the turning plate (2053) is gap-matched with the inner wall of the screen drum (204). A plurality of crushing teeth (2052) are spirally arranged along the outer wall of the roller body at a position between the spiral blade (2051) and the turning plate (2053).

5. A waste film separation system according to claim 4, characterized in that: The sieve hole (2041) of the first-stage screening device (2) is elliptical, with a major axis of 140-180 mm and a minor axis of 100-130 mm; The sieve holes (2041) of the secondary screening device (5) are circular holes with a diameter of 3-5 mm, and the spacing between the sieve holes (2041) is 2-4 mm.

6. The waste film separation system according to claim 2, characterized in that: A dust removal port is provided on the top of the housing (201) of the secondary screening device (5), and the dust removal port is connected to the inlet of the dust removal device (7) via a pipeline.

7. The waste film separation system according to claim 3, characterized in that: Two crushing and screening mechanisms are arranged side by side in the housing (201) of the first-stage screening device (2); a feed hopper (202) is connected to the screen cylinders (204) of the two crushing and screening mechanisms at the same time; each screen cylinder (204) is connected to a first-stage separator (3); and a discharging auger (203) is provided below each crushing and screening mechanism.

8. The waste film separation system according to claim 1, characterized in that: The first-stage separator (3) has the same structure as the second-stage separator (6). The first-stage separator (3) comprises a shell (301), a flap (302), a rotating shaft (303) and a handle (304). A feed port (305) is provided on one side of the shell (301), an air outlet (306) is provided on the top of the shell (301), a drop port (307) is provided on the bottom of the shell (301), a slide plate (308) is provided obliquely in the shell (301) below the feed port (305), a flap (302) is provided in the shell (301) on the opposite side above the slide plate (308), a rotating shaft (303) is fixedly provided on one end of the flap (302), two ends of the rotating shaft (303) respectively pass through the side walls of the shell (301) and are tightly fitted with the shell (301), and a handle (304) is fixedly installed on one end of the rotating shaft (303) outside the shell (301).

9. The waste film separation system according to claim 1, characterized in that: It also includes a transfer platform vehicle, on which the primary crusher (1), the first-level screening device (2), the first-level separator (3), the first-level fan (4), the second-level screening device (5), the second-level separator (6) and the recovery cyclone separator (8) are installed.

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