Residual film recycling device for topsoil

Abstract

This invention discloses a device for recycling residual film in the topsoil, comprising a frame, a film-lifting unit, a separation unit, and an air suction unit. The film-lifting unit is mounted on the frame and includes a film-lifting shaft and a film-lifting blade assembly. The film-lifting shaft extends along the width of the frame and is rotatable relative to the frame. The film-lifting blade assembly is sleeved on the film-lifting shaft and rotates with it. The separation unit is located downstream of the film-lifting unit and includes multiple film-screening rollers that are rotatable relative to the frame and are spaced apart along the length of the frame. The air suction unit is mounted on the frame and located directly above the separation unit. The air suction unit includes a suction housing and an air source. The inlet of the suction housing is connected to the air source, and the suction housing has a feed inlet on the side facing the film-screening rollers, extending along the width of the frame. This device for recycling residual film in the topsoil can improve the recycling efficiency and quality of residual film.

Description

Technical Field

[0001] This invention belongs to the field of agricultural machinery technology, specifically relating to a device for recycling residual film from the tillage layer. Background Technology

[0002] Mulching technology, with its advantages of heat preservation, moisture retention, prevention of water loss, and shortening of the growth cycle, has been widely used in arid and cold regions since its promotion and application. However, with the continuous expansion of the mulching area and the increase in the number of years of mulching, more and more residual film left in the fields has caused serious pollution to farmland and the environment, affecting not only crop emergence, root growth, and crop yield, but also mechanized farming operations.

[0003] Residual plastic film will remain in the topsoil of farmland, and it is severely fragmented and unevenly distributed. Related technologies for residual plastic film recycling machinery mainly include shovel-screen type and nail-tooth type. The shovel-screen type generally uses a film-lifting shovel to scoop up the mixture of film and soil from the topsoil, and then screens the soil and residual film. This method suffers from low operating efficiency and high tractor energy consumption. The nail-tooth type generally uses rollers with nails to collect residual film from the topsoil through a scooping and binding method. However, due to the severe fragmentation of the residual film, the nails are difficult to bond tightly with the film, affecting the removal efficiency and quality. Summary of the Invention

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention provide a device for recycling residual film from the topsoil layer, which can improve the recycling efficiency and quality of the residual film.

[0005] An embodiment of the present invention also proposes a device for recycling residual film in the tillage layer, comprising: a frame; a film-lifting unit, which is mounted on the frame and includes a film-lifting shaft and a film-lifting knife assembly, the film-lifting shaft extending along the width direction of the frame and rotatable relative to the frame, the film-lifting knife assembly being sleeved on the film-lifting shaft and rotating with the film-lifting shaft; a separation unit, located downstream of the film-lifting unit, which includes multiple film-screening rollers rotatable relative to the frame and spaced apart along the length direction of the frame; and an air suction unit, mounted on the frame and located directly above the separation unit, the air suction unit including an air suction housing and an air source, the inlet of the air suction housing communicating with the air source, and a feed inlet on the side of the air suction housing facing the film-screening rollers, the feed inlet extending along the width direction of the frame.

[0006] The residual film recycling device for the topsoil layer in this invention can improve the recycling efficiency and quality of residual film.

[0007] In some embodiments, the air intake unit further includes a distributor and a plurality of airflow hoses. The inlet of the distributor is connected to the air source, and the outlet of the distributor is connected to the plurality of airflow hoses respectively. The outlets of the plurality of airflow hoses are connected to the intake housing respectively, and the plurality of airflow hoses are arranged at intervals along the width direction of the frame.

[0008] In some embodiments, each of the airflow hoses is provided with a valve for regulating the airflow rate within the airflow hose.

[0009] In some embodiments, the air suction unit further includes a plurality of airflow baffles, which are arranged alternately at intervals along the length of the frame, and the cross-sectional area of ​​the airflow baffles gradually increases in the direction of airflow.

[0010] In some embodiments, the side of the airflow baffle facing the flow channel is an arc-shaped plate.

[0011] In some embodiments, the film-lifting knife assembly includes a knife holder, a soil-cutting knife, and a soil-throwing knife. The knife holder is sleeved on the film-lifting shaft, and the soil-cutting knife and the soil-throwing knife are detachably mounted on the knife holder, and the soil-cutting knife and the soil-throwing knife are arranged at intervals in the circumferential direction of the film-lifting shaft.

[0012] In some embodiments, the number of film-lifting knife groups is multiple, and the multiple film-lifting knife groups are arranged at intervals along the axial direction of the film-lifting shaft, dividing the circumference of the film-lifting shaft into multiple first planes. The first planes are parallel to the axial direction of the film-lifting shaft, and each first plane has at least one soil-cutting knife and one soil-throwing knife, and there is a first preset angle between the soil-cutting knife and the soil-throwing knife on two adjacent first planes.

[0013] In some embodiments, the dumping blade has a first side and a second side in its width direction, the first side being upstream of the second side in the rotation direction of the dumping blade, and the first side having a cutting edge.

[0014] In some embodiments, the outer periphery of the film screening roller is provided with a plurality of teeth, and the plurality of teeth have a second preset angle with the axis of the film screening roller.

[0015] In some embodiments, the plurality of teeth are divided into multiple rows of tooth groups, and the plurality of teeth in the tooth groups are spirally spaced along the axial direction of the screen roller. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the residual film recycling device for the topsoil according to an embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the structure of the film-forming unit in an embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the separation unit in an embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram of the air intake unit according to an embodiment of the present invention.

[0020] Figure 5 This is a front view of the air intake unit according to an embodiment of the present invention.

[0021] Figure 6 This is a cross-sectional view of the air intake unit according to an embodiment of the present invention.

[0022] Figure 7 This is a schematic diagram of gas flow in the air intake unit according to an embodiment of the present invention.

[0023] Figure 8 This is a schematic diagram of the structure of a tooth according to an embodiment of the present invention.

[0024] Figure 9 This is a schematic diagram of the operation of the residual film recycling device in the topsoil according to an embodiment of the present invention.

[0025] Figure label:

[0026] The machine consists of a frame (100), a film-forming unit (200), a separation unit (300), an air suction unit (400), and a transmission unit (500).

[0027] Film-forming axis 1,

[0028] Film-lifting knife assembly 2, knife holder 21, soil cutting knife 22, soil throwing knife 23.

[0029] Screening roller 3, teeth 31,

[0030] Suction housing 4, flow channel 41, feed inlet 42,

[0031] 5. Air source, 6. Distributor, 7. Airflow hose, 8. Airflow baffle, 9. Gearbox, 10. First sprocket, 11. Second sprocket, 12. Membrane box, 13. Top cover, 14. Connector. Detailed Implementation

[0032] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0033] like Figures 1 to 9As shown, an embodiment of the present invention also proposes a device for recycling residual film in the tillage layer, including a frame 100, a film-lifting unit 200, a separation unit 300, and an air suction unit 400. The film-lifting unit 200 is mounted on the frame 100 and includes a film-lifting shaft and a film-lifting blade assembly 2. The film-lifting shaft 1 extends along the width direction of the frame 100 and is rotatable relative to the frame 100. The film-lifting blade assembly 2 is sleeved on the film-lifting shaft and rotates with the film-lifting shaft. The separation unit 300 is located downstream of the film-lifting unit. The separation unit 300 includes multiple film screening rollers 3, which are rotatable relative to the frame 100 and are spaced apart along the length of the frame 100. The air suction unit 400 is mounted on the frame 100 and is located directly above the separation unit 300. The air suction unit 400 includes an air suction housing 4 and an air source 5. The inlet of the air suction housing 4 is connected to the air source 5. The side of the air suction housing 4 facing the film screening rollers 3 has a feed inlet 42, which extends along the width of the frame 100.

[0034] Specifically, such as Figure 1 As shown, the film-forming unit 200 and the separation unit 300 are arranged sequentially from left to right. The film-forming rollers are arranged horizontally along the front-to-back direction, and their front and rear ends are connected to the frame 100 through bearing seats. The film-forming knife assembly 2 is sleeved on the film-forming shaft and rotates clockwise with the film-forming shaft. The separation unit 300 is located to the right of the film-forming unit 200. The separation unit 300 includes multiple film-forming rollers 3, which are arranged at intervals in the left-to-right direction, and the installation height of the multiple film-forming rollers 3 gradually increases from left to right.

[0035] Optionally, multiple film screening rollers 3 are arranged in parallel to each other, and each film screening roller 3 has a first sprocket 10 at its front end, and the first sprockets 10 are connected to each other by a chain. For example, the number of film screening rollers 3 can be three, and the three film screening rollers 3 are arranged at intervals in the left-right direction.

[0036] The suction housing 4 is located directly above the separation unit 300. The suction housing 4 and the separation unit 300 are spaced apart in the vertical direction. The suction housing 4 has a flow channel 41 inside. The inlet of the flow channel 41 is connected to the air source 5, and the outlet of the flow channel 41 is connected to the film collection box 12. The feed inlet 42 is located at the lower end of the suction housing 4. The broken residual film can enter the flow channel 41 through the feed inlet 42.

[0037] It should be noted that the upper end of the film collection box 12 is provided with a top cover 13. One end of the top cover 13 is hinged to the film collection box 12, and the other end of the top cover 13 can swing relative to the film collection box 12 to open or close the film collection box 12. The right end of the frame 100 is provided with a buckle, which can fix the position of the top cover 13.

[0038] For example, the air source 5 can be a centrifugal fan, and the centrifugal fan shaft is equipped with a second sprocket 11, which can be connected to a power source via a chain. For example, the power source can be a self-contained engine or driven by a power source on a tractor.

[0039] It should be noted that after the air source 5 is started, airflow is generated in the flow channel 41. Since the gas flow rate in the flow channel 41 is greater than the gas flow rate in the outside, a negative pressure zone is formed at the feed inlet, thereby achieving the adsorption function. The negative pressure is used to draw the small residual film between the screen film roller 3 and the air suction shell 4 into the flow channel 41 through the feed inlet 42.

[0040] Optionally, the feed inlet 42 can be located between the first-stage film-forming roller 3 and the second-stage film-forming roller 3. It should be noted that the first-stage film-forming roller 3 is the film-forming roller 3 closest to the film-forming unit 200.

[0041] By placing the feed inlet 42 between the first-stage film screening roller 3 and the second-stage film screening roller 3, smaller residual film can be better adsorbed, reducing the amount of residual film that falls back into the soil.

[0042] The residual film recycling device in the topsoil of this invention addresses the issue that residual film in the topsoil is generally embedded and buried in the soil in fragmented form. As aging intensifies and damage from field machinery occurs, the size of the residual film varies. Existing technologies often only allow recycling of residual film fragments below a certain critical size (by tying or collecting them). However, this invention, through a combination of pneumatic and mechanical methods, can recycle residual film fragments of different sizes, which will significantly improve the rate of residual film removal from the field and provide a completely new solution for the recycling of residual film in the topsoil.

[0043] The soil and residual film are thrown together into the separation unit 300 using the film-lifting knife assembly 2. After being screened by multiple film-screening rollers 3, the residual film is transported to the film collection box 12. Small pieces of residual film are sucked into the feed inlet 42 by the negative pressure of the air suction unit 400 and moved into the film collection box 12 in the flow channel 41. Through the dual action of air suction and mechanical separation, residual films of different sizes can be separated and screened in stages, thereby improving the recycling efficiency and quality of residual film while increasing the film-soil separation rate.

[0044] In some embodiments, the air suction unit 400 further includes a distributor 6 and a plurality of airflow hoses 7. The inlet of the distributor 6 is connected to the air source 5, the outlet of the distributor 6 is connected to the plurality of airflow hoses 7 respectively, the outlet of the plurality of airflow hoses 7 is connected to the suction housing 4 respectively, and the plurality of airflow hoses 7 are arranged at intervals along the width direction of the frame 100.

[0045] Specifically, such as Figure 4As shown, the inlet of the distributor 6 is connected to the outlet of the air source 5. The distributor 6 has multiple air outlets, which are connected to multiple airflow hoses 7 respectively. The outlet of the airflow hose 7 is connected to the suction housing 4. The outlet of the airflow hose 7 is arranged near the feed inlet 42, and the outlet of the airflow hose 7 is located downstream of the feed inlet 42. The multiple airflow hoses 7 are evenly spaced along the front-back direction.

[0046] Optionally, a connecting nozzle is installed at the connection between the airflow hose 7 and the suction housing 4. The flow cross-sectional area of ​​the connecting nozzle gradually increases along the direction of gas flow, thereby expanding the coverage area of ​​the airflow and ensuring the uniformity of airflow distribution within the suction housing 4, thereby improving the efficiency and quality of residual film adsorption.

[0047] By setting the distributor 6, the uniformity of gas flow in each airflow hose 7 can be improved, thereby ensuring the uniformity of gas distribution in the suction housing 4 and ensuring the efficiency and quality of residual film adsorption. Multiple airflow hoses 7 are evenly spaced in the front-to-back direction, so that the airflow can be distributed across the entire cross-section of the suction housing 4, further enhancing the uniformity of gas distribution.

[0048] In some embodiments, each airflow hose 7 is provided with a valve for regulating the airflow rate within the airflow hose 7.

[0049] For example, the valve can be a solenoid valve. By setting the valve, the gas flow rate in the airflow hose 7 can be adjusted, thereby making it easier to adjust the uniformity of airflow distribution and suction force in the suction housing 4.

[0050] Optionally, a flow detector can be installed inside the intake housing 4. For example, multiple flow detectors can be installed in the front-rear direction of the intake housing 4. The flow detectors can be used to detect the residual film distribution at different positions inside the intake housing 4, and the gas flow rate of the airflow hose 7 at different positions can be adjusted by detecting the residual film distribution.

[0051] For example, when the amount of residual film on the side of the suction housing 4 near the wall is large, the flow rate of the airflow hose 7 at the corresponding position is increased to improve the suction force and gas flow rate of the negative pressure at that position, thereby achieving the adsorption force and pushing force of the residual film at that position, ensuring the efficiency and quality of residual film screening and conveying.

[0052] In some embodiments, the air suction unit 400 further includes a plurality of airflow baffles 8, which are arranged alternately at intervals along the length of the frame 100, and the cross-sectional area of ​​the airflow baffles 8 gradually increases in the direction of airflow.

[0053] Specifically, such as Figure 6As shown, multiple airflow baffles 8 are arranged alternately in the left-right direction. In other words, multiple airflow baffles 8 are arranged at intervals in the left-right direction, and multiple airflow baffles 8 are arranged alternately on the upper and lower inner walls of the suction housing 4. By setting multiple airflow baffles 8, the stability and uniformity of airflow within the suction housing 4 are ensured, thereby ensuring the stability and uniformity of the movement of the residual film within the suction housing 4. The cross-sectional area of ​​the airflow baffles 8 gradually increases from left to right. When the airflow passes through the airflow baffles 8, the gas is gradually compressed and then diffused, thereby ensuring the gas delivery pressure and thus ensuring the pushing force on the residual film.

[0054] In some embodiments, the side of the airflow baffle 8 facing the flow channel 41 is an arc-shaped plate.

[0055] Specifically, such as Figure 6 As shown, the inner side of the airflow baffle 8 is an arc-shaped plate. Setting the inner side of the airflow baffle 8 as an arc-shaped plate can ensure the smoothness of gas flow, reduce the obstruction effect of the airflow baffle 8 on the gas, and improve the stability of gas and residual film flow.

[0056] In some embodiments, the film-lifting knife assembly 2 includes a knife holder 21, a soil cutting knife 22, and a soil throwing knife 23. The knife holder 21 is sleeved on the film-lifting shaft, and the soil cutting knife 22 and the soil throwing knife 23 are detachably mounted on the knife holder 21, and the soil cutting knife 22 and the soil throwing knife 23 are arranged at intervals in the circumferential direction of the film-lifting shaft.

[0057] Specifically, such as Figure 2 As shown, the cutter holder 21 is sleeved on the film lifting shaft. The cutter holder 21 has multiple mounting ports, which are arranged at intervals around the circumference of the film lifting shaft. For example, there are four mounting ports. Two soil cutting blades 22 and two soil throwing blades 23 are installed in the four mounting ports respectively. The two soil cutting blades 22 and the two soil throwing blades 23 are arranged alternately around the circumference of the film lifting shaft.

[0058] For example, the cutting blade 22 includes an integrally formed cutting section and a connecting section. One end of the connecting section is detachably connected to the blade holder 21. The connecting section is arc-shaped and extends circumferentially along the film-forming axis. The cutting section extends axially along the film-forming axis, and the direction of extension of the cutting section forms an angle with the axis of the film-forming axis. The cutting sections of two different cutting blades 22 on one blade holder 21 are arranged in a mirror-symmetrical manner.

[0059] The connecting and cutting sections can be used to cut and break up plant roots, compacted soil, and residual film in the soil, reducing the amount of plant roots, compacted soil, and large pieces of residual film entangled on the recycling device. The cutting section extends axially along the film-lifting shaft and is set at an angle to the axis of the film-lifting shaft, which can increase the resistance of the cutting section entering the soil and also improve cutting efficiency and quality. The integrally formed connecting and cutting sections can improve the structural strength of the entire cutting blade 22.

[0060] The soil-throwing blade 23 includes an integrally formed mounting part and a soil-throwing part. One end of the mounting part is mounted on the blade holder 21. The mounting part is also an arc-shaped structure extending circumferentially along the film-forming axis. The soil-throwing part extends axially along the film-forming axis, and the extension direction of the soil-throwing part forms an angle with the axis of the film-forming axis. The soil-throwing parts of the two different soil-throwing blades 23 on one blade holder 21 are arranged in a mirror-symmetrical manner, which can make soil throwing more uniform and continuous, and ensure the stability of soil and residual film transportation to the separation unit 300. The integrally formed mounting part and soil-throwing part can also improve the structural strength of the soil-throwing blade 23.

[0061] In some embodiments, there are multiple film-lifting knife groups, which are spaced apart along the axial direction of the film-lifting shaft. Multiple first planes are divided along the circumference of the film-lifting shaft. The first planes are parallel to the axial direction of the film-lifting shaft. Each first plane has at least one soil-cutting knife 22 and one soil-throwing knife 23, and there is a first preset angle between the soil-cutting knife 22 and the soil-throwing knife 23 on two adjacent first planes.

[0062] Specifically, such as Figure 2 As shown, there are multiple cutter holders 21, which are evenly spaced in the front-to-back direction, with the cutter holders 21 at the front end and the cutter holders 21 at the rear end arranged symmetrically in the front-to-back direction. Multiple first planes are divided along the front-to-back direction; in other words, the first planes are parallel to the front-to-back direction and tangent to the outer surface of the film-forming shaft. These multiple first planes are spaced circumferentially along the film-forming shaft. Each first plane has at least one cutting blade 22 and one throwing blade 23. There is a first preset angle between the cutting blades 22 on adjacent first planes, and a first preset angle between the throwing blades 23 on adjacent first planes. The first preset angle is between 54° and 85°. It should be noted that when the blades cut and throw soil, they will be subjected to a reaction force from the soil. This force will generate a torque load on the cutter shaft. To maintain the overall balance of the cutter roller, the number of blades on both the front and rear sides of the film-forming shaft should be consistent, and their arrangement should have a symmetrical structure. Setting the included angle between the cutters on different planes of the single-sided film-lifting shaft can ensure that the cutters alternately enter the soil. This alternating entry into the soil makes the axial force and deflection force of the film-lifting shaft roughly balanced, thereby reducing the axial force and deflection force on the film-lifting shaft at a single moment, promoting the smooth operation of the film-lifting shaft and extending its service life.

[0063] In some embodiments, the dumping blade 23 has a first side and a second side in its width direction, the first side being located upstream of the second side in the rotation direction of the dumping blade 23, and the first side having a cutting edge.

[0064] For example, when the soil-throwing blade 23 rotates clockwise, the right side of the blade 23 enters the soil first, and the right side of the blade 23 has a cutting edge. Conversely, when the soil-throwing blade 23 rotates counterclockwise, the left side of the blade 23 enters the soil first, and the left side of the blade 23 has a cutting edge. By setting a cutting edge on one side of the soil-throwing blade 23, the soil, plant roots and compacted soil can be cut and broken, thereby improving the quality of soil and residual film throwing.

[0065] In some embodiments, the outer periphery of the film screening roller 3 is provided with a plurality of teeth 31, and the plurality of teeth 31 have a second preset angle with the axis of the film screening roller 3.

[0066] Specifically, such as Figure 3 and Figure 8 As shown, the outer circumferential surface of the screen film roller 3 is provided with a plurality of teeth 31. The positive tooth surface of the teeth 31 has a second preset angle with the axis of the screen film roller 3. It should be noted that the positive tooth surface of the teeth 31 is the side that preferentially contacts the soil and residual film. For example, when the screen film roller 3 rotates clockwise, the right side of the teeth 31 is the positive tooth surface, and conversely, when the screen film roller 3 rotates counterclockwise, the left side of the teeth 31 is the positive tooth surface.

[0067] A second preset angle is set between the positive tooth surface of the tooth 31 and the central section of the screen film roller to change the impact effect of the tooth 31 on the film-soil mixture. Force analysis of the tooth 31 shows that as the angle between the positive tooth surface of the tooth 31 and the central section of the screen film roller decreases, the horizontal component of the velocity generated by the film-soil mixture under the impact of the tooth 31 continuously increases, while the vertical component decreases, thus enhancing the conveying effect of the roller on the film-soil mixture. To achieve efficient screening of the residual film and soil, it is necessary to ensure that the film-soil mixture is thrown to a certain height, thereby separating it based on the differences in characteristics between the residual film and soil. Therefore, a certain angle needs to be set between the positive tooth surface of the tooth 31 and the central section of the screen film roller. Simultaneously, when the tooth 31 rotates below the horizontal plane, as the second preset angle increases, the frictional force generated when the positive tooth surface contacts the residual film also increases at the angle with the horizontal plane, which is more conducive to the residual film detaching from the tooth 31 and effectively prevents the residual film from being carried back.

[0068] According to theoretical analysis and preliminary test results, as the second preset angle increases, the impact height of the mixture increases, the conveying efficiency decreases, and material blockage is easily caused. On the other hand, if the second preset angle is too small, it will affect the screening effect of the mixture. Therefore, the second preset angle is set between 30° and 45°.

[0069] In some embodiments, the plurality of teeth 31 are divided into multiple rows of teeth 31 groups, and the plurality of teeth 31 in the teeth 31 groups are spirally spaced in the axial direction of the screen roller 3.

[0070] Specifically, such as Figure 3 As shown, multiple teeth 31 in each group are arranged at intervals along the front-back direction and are spirally distributed, that is, the outline of the arrangement of multiple teeth 31 is a spiral. Multiple groups of teeth 31 are arranged at intervals in the circumferential direction of the screen film roller 3. By setting multiple groups of teeth 31, the efficiency of soil throwing and the stability of continuous soil throwing can be improved.

[0071] In some embodiments, the tillage film recycling device further includes a power unit, which includes a gearbox 9, a side drive shaft, a first sprocket 10, and a second sprocket 11. The gearbox 9 is installed at the left end of the frame 100. The power input shaft of the gearbox 9 is connected to the drive shaft of the tractor through a coupling. Power is transmitted through the gearbox 9 to the film lifting shaft and drives the film lifting knife assembly 2 to rotate. The other output shaft of the gearbox 9 transmits power to the film screening roller 3 through a mechanical transmission component. The other output shaft of the gearbox 9 transmits power to the rotating shaft of the negative pressure fan.

[0072] The following reference Figures 1 to 9 The operation process of the residual film recycling device in the topsoil according to an embodiment of the present invention is described.

[0073] The frame 100 is mounted on the rear of the tractor via a three-point suspension. As the tractor moves, the tractor's rear power take-off shaft transmits power to the gearbox 9 via a drive shaft. The gearbox 9 then mechanically transmits the power to the multi-stage screen roller 3. On the other side of the gearbox 9, the power is mechanically transmitted to the rotating shaft of the air source 5.

[0074] A wind source drives gas into distributor 6, which evenly distributes the airflow into each airflow hose. The gas then flows from each hose into the inlet of channel 41. The gas in channel 41 flows towards the outlet, creating a negative pressure zone at the inlet. The air suction unit can then adsorb small-sized film fragments and small soil particles through this zone. Due to the presence of airflow baffles 8 within channel 41, flow velocity changes occur in different areas. The small-sized film fragments and small soil particles adsorbed within channel 41 are separated within the airflow field of channel 41 due to differences in their aerodynamic properties.

[0075] During operation, the cutting blades 22 on the film-lifting blade assembly 2 shear and break up the adhering mixture of soil and residual film in the cultivated layer from the farmland, and then throw it to the rear by the throwing blades 23. The multi-stage staggered film-screening rollers 3 located at the rear of the film-lifting blade assembly 2 are evenly distributed with pyramidal teeth 31. The positive teeth of the teeth 31, under the action of the rotating rollers, further crush the film-soil mixture thrown by the throwing blades, while simultaneously throwing the residual film backward. Above the first-stage film-screening rollers 3 and the second-stage film-screening rollers 3 is an air-suction shell 4, with a feed inlet 42. The crushed soil particles fall back into the field through the gaps between the staggered teeth 31, while small-sized residual film fragments enter the air-suction shell 4 through the feed inlet 42, and large-sized residual film fragments are transported to the film collection box 12 at the end by the action of the staggered teeth 31. The residual film entering the suction shell 4 is further separated from the soil by the change in airflow in the pipeline. The separated residual film also enters the film collection box 12 through the flow channel 41 in the suction shell 4, thus completing the recycling of the residual film in the topsoil.

[0076] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying 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.

[0077] 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 at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0078] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 mechanical connection, an electrical connection, or a connection that allows communication between them; 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0079] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0080] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0081] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A device for recycling residual film from tillage layers, characterized in that, include: frame; A film-forming unit is mounted on the frame and includes a film-forming shaft and a film-forming knife assembly. The film-forming shaft extends along the width direction of the frame and is rotatable relative to the frame. The film-forming knife assembly is sleeved on the film-forming shaft and rotates with the film-forming shaft. A separation unit is located downstream of the film-forming unit. The separation unit includes multiple film-screening rollers, which are rotatable relative to the frame and are spaced apart along the length of the frame. An air suction unit is mounted on the frame and located directly above the separation unit. The air suction unit includes an air suction housing and an air source. The inlet of the air suction housing is connected to the air source. The air suction housing has a feed inlet on the side facing the screen film roller, and the feed inlet extends along the width direction of the frame. The film-lifting knife assembly includes a knife holder, a soil-cutting knife, and a soil-throwing knife. The knife holder is sleeved on the film-lifting shaft, and the soil-cutting knife and the soil-throwing knife are detachably mounted on the knife holder. The soil-cutting knife and the soil-throwing knife are arranged at intervals in the circumferential direction of the film-lifting shaft. The outer periphery of the film screening roller is provided with a plurality of teeth, and the plurality of teeth have a second preset angle with the axis of the film screening roller; The teeth are divided into multiple rows of tooth groups, and the teeth in the tooth groups are spirally spaced along the axial direction of the screen roller.

2. The residual film recycling device for cultivated layer according to claim 1, characterized in that, The air intake unit also includes a distributor and multiple airflow hoses. The inlet of the distributor is connected to the air source, and the outlet of the distributor is connected to the multiple airflow hoses respectively. The outlets of the multiple airflow hoses are connected to the intake housing respectively. The multiple airflow hoses are arranged at intervals along the width direction of the frame.

3. The device for recycling residual film in the tillage layer according to claim 2, characterized in that, Each of the airflow hoses is equipped with a valve for regulating the airflow rate within the airflow hose.

4. The device for recycling residual film in the tillage layer according to claim 1, characterized in that, The air suction unit also includes multiple airflow baffles, which are arranged alternately at intervals along the length of the frame, and the cross-sectional area of ​​the airflow baffles gradually increases in the direction of airflow.

5. The tillage film residue recycling device according to claim 4, characterized in that, The side of the airflow baffle facing the flow channel is an arc-shaped plate.

6. The device for recycling residual film in the tillage layer according to claim 1, characterized in that, The number of film-lifting knife groups is multiple, and the multiple film-lifting knife groups are arranged at intervals along the axial direction of the film-lifting shaft. The film-lifting shaft is divided into multiple first planes along its circumference. The first planes are parallel to the axial direction of the film-lifting shaft. Each first plane has at least one soil-cutting knife and one soil-throwing knife, and there is a first preset angle between the soil-cutting knife and the soil-throwing knife on two adjacent first planes.

7. The tillage film residue recycling device according to claim 6, characterized in that, The dumping blade has a first side and a second side in its width direction, the first side being located upstream of the second side in the rotation direction of the dumping blade, and the first side having a cutting edge.

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