Waste mulching film recycling and impurity removing method

Abstract

The invention discloses a waste mulching film recycling and impurity removing method. The method comprises the following steps that (1) a mixed waste mulching film is slit; (2) scattering the cut materials; (3) the scattered materials are screened, and soil in the materials is removed through screening; (4) the screened materials are separated through a vertical film-residue separator; the vertical film and residue separator comprises a vertically arranged bin body, a discharging port is formed in the bottom of the bin body, the bin body comprises a first side face with a feeding port and a second side face with a discharging port, the first side face is opposite to the second side face, an air bellow unit is installed in the bin body, and the air bellow unit can blow air to the discharging port; and 5) recovering the material discharged from the discharge port through a first straw conveying unit, and recovering the mulching film discharged from the discharge port through a mulching film conveying unit. The waste mulching film recycling and impurity removing method is high in recycling efficiency, low in cost and suitable for large-scale popularization.

Description

Technical Field

[0001] The present application relates to the field of ground film recycling, and in particular to a method for recycling and removing impurities from waste ground film. Background Art

[0002] Ground film is a ground covering film, usually a transparent or black PE film, used for ground covering to increase soil temperature, maintain soil moisture, maintain soil structure, prevent pests from attacking crops and diseases caused by certain microorganisms, etc., and promote plant growth. It has a good effect on increasing crop yields. Although ground film has many benefits for crops, it is difficult to remove because it will remain in the ground after use. The ground film remains for a long time and is not easy to decompose in the soil, so it will have a negative impact on the soil for a long time. Therefore, it is necessary to recycle the ground film in the soil. However, the ground film recycled in the soil is often a mixture of soil blocks, ground film, cotton, straw and other materials. The general cleaning method mainly uses multi-stage drum screens and multi-stage wind selection, which has low sorting efficiency and high energy consumption. The large-scale treatment and recycling of waste ground film processing capacity is limited and cannot be promoted. Patent CN216853247U (a mulch film separation and recovery device) and patent CN215301383U (a straw mulch film separation mechanism for a mulch film recovery machine) both disclose corresponding mulch film recovery devices and methods, but they still cannot meet the high efficiency requirements of existing mulch film recovery, and many existing mulch film recovery methods are only locally improved, lacking a complete and systematic mulch film recovery device and method. Summary of the invention

[0003] Purpose of the invention: This application aims to overcome the defects of the developing technology and provide a method for recycling and removing impurities from waste ground film.

[0004] Technical solution: A method for recycling and removing impurities from waste mulch film, comprising the following steps:

[0005] 1) Cutting the mixed waste mulch film;

[0006] 2) Break up the cut materials;

[0007] 3) Screening the dispersed materials to remove soil from the materials;

[0008] 4) Separating the screened materials by using a vertical membrane slag separator; the vertical membrane slag separator comprises a vertically arranged bin body, the bottom of the bin body has a feed outlet, the bin body comprises a first side surface having a feed inlet and a second side surface having a discharge outlet, the first side surface and the second side surface are opposite, a bellows unit is installed in the bin body, and the bellows unit can blow air toward the discharge outlet;

[0009] 5) The material discharged from the discharge port is recovered by the first straw conveying unit, and the ground film discharged from the discharge port is recovered by the ground film conveying unit.

[0010] Furthermore, a vertical feeding unit is installed in the warehouse body, and the vertical feeding unit includes an upper rotating shaft, a lower rotating shaft, two upper sprockets installed at the upper rotating shaft, two lower sprockets installed at the lower rotating shaft, and a rotating shaft driving unit for driving the upper rotating shaft or the lower rotating shaft to rotate, a chain is connected between the upper sprocket and the lower sprocket on the same side, a metal mesh is connected between the two chains, the bellows unit is located above the lower rotating shaft and surrounded by the metal mesh, a plurality of strip plates are connected between the two chains, and a plurality of separation rods are installed at each strip plate.

[0011] Therefore, due to the vertical feeding unit, after the material is fed from the feed port, it falls into the vertical feeding unit, and the material can be slowly transported in the vertical direction in the bin body, which is more conducive to the falling of the straw, and when the material is transported to the discharge port, it is blown by the bellows unit, which is conducive to the blowing of the bellows unit.

[0012] Furthermore, the separation rod is an L-shaped separation rod.

[0013] This is more conducive to the blowing of the bellows unit, and the blowing is blocked by the strip plate.

[0014] Furthermore, the shaft driving unit is a reduction motor.

[0015] Furthermore, a plurality of spring units are installed in the bin body, and the spring units include a plurality of rotating rollers installed in the bin body, and the rotating rollers can abut against the ends of the separation rods and allow the separation rods to pass through.

[0016] Further, only some of the separation bars among all the separation bars will pass through the rotating roller.

[0017] Therefore, when the end of the separation rod abuts against the rotating roller, it is pressed downward (the separation rod has a certain length and thus has a certain elasticity as a whole and can be pressed downward). At this time, the rotating roller will rotate due to the friction of the separation rod. As the separation rod moves upward, the separation rod will eventually break away from contact with the rotating roller and bounce upward, thereby causing shaking, which is conducive to the falling of straw, etc.

[0018] Furthermore, in the step 1), 90% of the ground film is cut to less than 700 mm.

[0019] Furthermore, the screening unit is a drum screen.

[0020] Furthermore, the aperture of the drum screen is 20-40 mm.

[0021] Furthermore, it also includes an air supply bellows located below the bellows unit, which can be used to blow air toward the material discharged from the discharge port; in the step 4), the bellows unit and the air supply bellows are simultaneously used to blow air toward the material discharged from the discharge port.

[0022] Furthermore, the bellows unit is connected to a first fan for supplying air to the bellows unit.

[0023] Furthermore, the air supply bellows is connected to a second fan for supplying air to the air supply bellows.

[0024] In some embodiments, the air supply bellows is installed in the bin body.

[0025] In other embodiments, the air supply device is installed outside the warehouse.

[0026] Furthermore, it also includes a reverse conveying part, which includes a first reverse conveying unit, a second reverse conveying unit and a second straw conveying unit, the second reverse conveying unit is located below the first reverse conveying unit, and the second straw conveying unit is located below the second reverse conveying unit; the conveying directions of the first reverse conveying unit and the second reverse conveying unit are the same, and the conveying directions of the first reverse conveying unit and the ground film conveying unit are opposite; in the step 5), the material coming out of the discharge port and falling on the first reverse conveying unit or the second reverse conveying unit is conveyed to the second straw conveying unit and recovered by the second straw conveying unit.

[0027] Furthermore, the ground film conveying unit is located below the second reverse conveying unit.

[0028] Furthermore, the length of the first reverse conveying unit is about 1-2 m.

[0029] Furthermore, the first reverse conveying unit is located 1-1.5 meters below the air supply bellows; the second reverse conveying unit is located 0.4-06 meters below the first reverse conveying unit; and the second reverse conveying unit is 0.5-1 meter longer than the first reverse conveying unit.

[0030] Furthermore, the first reverse conveying unit has one end close to the warehouse body as the first end, and the other end as the second end; the second reverse conveying unit has one end close to the warehouse body as the first end, and the other end as the second end; the first end of the first reverse conveying unit is closer to the warehouse body than the first end of the second reverse conveying unit; the first end of the first reverse conveying unit and the first end of the second reverse conveying unit are both located above the second straw conveying unit.

[0031] Furthermore, the bellows unit and the air supply bellows both have a plurality of strip-shaped air outlets; the air outlet speed of the bellows unit is 20-30 m / s, and the air outlet speed of the air supply bellows is 30-50 m / s.

[0032] Furthermore, the width of the strip-shaped air outlet of the bellows unit is 1-10 mm.

[0033] Furthermore, the width of the strip-shaped air outlet of the air supply bellows is 1-3 mm.

[0034] Furthermore, an induced draft fan is installed on the top of the warehouse body, and the induced draft fan performs air suction. The wind speed of the induced draft fan is 2-5m / s. In the step 4), the induced draft fan performs air suction operation at the same time.

[0035] Furthermore, the method further comprises step 6) feeding the materials of the first straw conveying unit and the second straw conveying unit again from the feed inlet of the vertical membrane-slag separator for secondary separation.

[0036] Furthermore, the method further comprises step 7) manually sorting the materials in the first straw conveying unit and the second straw conveying unit to separate the ground film.

[0037] Furthermore, the method further comprises step 8) separating the materials after the mulch film is sorted out in step 7) to separate cotton and straw.

[0038] Furthermore, the slitting operation in the step 1) is performed by a hydraulic slitting machine or a gantry cutter; the breaking up operation in the step 2) is performed by a material breaking up unit; the screening unit is a drum screening unit; the material after the step 1) is transported by the first material conveying unit to the position where the step 2) is performed; the material after the step 2) is transported by the second material conveying unit to the drum screen unit; the material after the step 3) is transported by the third material conveying unit to the feed port of the vertical membrane slag separator.

[0039] The slitting unit may be a slitting unit of the prior art. In some embodiments, other types of slitting units may also be used.

[0040] The breaking up unit can be any breaking up unit in the prior art.

[0041] In some embodiments, the screening unit may be other types of screening units, such as a vibrating screen.

[0042] Furthermore, the first material conveying unit, the second material conveying unit and the third material conveying unit are all conveyor belt units.

[0043] Furthermore, the first reverse conveying unit and the second reverse conveying unit are both conveyor belt units.

[0044] Furthermore, the first straw conveying unit and the second straw conveying unit are both conveyor belt units.

[0045] Furthermore, the ground film conveying unit is a conveyor belt unit.

[0046] In addition, the present application also discloses a waste film separation and recovery system, including a vertical film residue separator, an air supply unit, a reverse conveying part and a film conveying unit, the vertical film residue separator including a vertically arranged bin body, the bottom of the bin body having a discharge port, the bin body including a first side surface having a feed port and a second side surface having a discharge port, the first side surface and the second side surface being opposite, a bellows unit being installed in the bin body, the bellows unit being capable of blowing air toward the discharge port; the air supply unit including an air supply bellows located below the bellows unit, the air supply bellows being capable of blowing air toward the material discharged from the discharge port; the reverse conveying part including a first reverse conveying unit, a second reverse conveying unit and a second straw conveying unit, the second reverse conveying unit being located below the first reverse conveying unit, and the second straw conveying unit being located below the second reverse conveying unit; the conveying directions of the first reverse conveying unit and the second reverse conveying unit are the same, and the conveying directions of the first reverse conveying unit and the film conveying unit are opposite.

[0047] Furthermore, a vertical feeding unit is installed in the warehouse body, and the vertical feeding unit includes an upper rotating shaft, a lower rotating shaft, two upper sprockets installed at the upper rotating shaft, two lower sprockets installed at the lower rotating shaft, and a rotating shaft driving unit for driving the upper rotating shaft or the lower rotating shaft to rotate, a chain is connected between the upper sprocket and the lower sprocket on the same side, a metal mesh is connected between the two chains, the bellows unit is located above the lower rotating shaft and surrounded by the metal mesh, a plurality of strip plates are connected between the two chains, and a plurality of separation rods are installed at each strip plate.

[0048] Furthermore, the separation rod is an L-shaped separation rod.

[0049] Furthermore, the shaft driving unit is a reduction motor.

[0050] Furthermore, a plurality of spring units are installed in the bin body, and the spring units include a plurality of rotating rollers installed in the bin body, and the rotating rollers can abut against the ends of the separation rods and allow the separation rods to pass through.

[0051] Further, only some of the separation bars among all the separation bars will pass through the rotating roller.

[0052] Furthermore, it also includes a frame for fixing the warehouse body.

[0053] In some embodiments, the air supply bellows is installed in the bin body.

[0054] In other embodiments, the air supply device is installed outside the warehouse.

[0055] Furthermore, the ground film conveying unit is located below the second reverse conveying unit.

[0056] Furthermore, the first reverse conveying unit is located 1-1.5 meters below the air supply bellows; the second reverse conveying unit is located 0.4-06 meters below the first reverse conveying unit; and the second reverse conveying unit is 0.5-1 meter longer than the first reverse conveying unit.

[0057] Furthermore, the first reverse conveying unit has one end close to the warehouse body as the first end, and the other end as the second end; the second reverse conveying unit has one end close to the warehouse body as the first end, and the other end as the second end; the first end of the first reverse conveying unit is closer to the warehouse body than the first end of the second reverse conveying unit; the first end of the first reverse conveying unit and the first end of the second reverse conveying unit are both located above the second straw conveying unit.

[0058] Furthermore, the bellows unit and the air supply bellows both have multiple strip air outlets; the air outlet speed of the bellows unit is 20-30m / s, and the air outlet speed of the air supply bellows is 30-50m / s; an induced draft fan is installed on the top of the warehouse body, and the induced draft fan sucks air, and the wind speed of the induced draft fan is 2-5m / s.

[0059] The present application also discloses a waste film recovery and impurity removal system, comprising a cutting unit, a breaking up unit, a screening unit and the above-mentioned waste film separation and recovery system; the cut material of the cutting unit is transported to the breaking up unit by a first material conveying unit, the broken material of the breaking up unit is transported to the screening unit by a second material conveying unit, and the screened material of the screening unit is transported to the feed inlet of the waste film separation and recovery system by a third material conveying unit.

[0060] Furthermore, it also includes a dust removal unit, which includes a dust hood and a filter bag dust removal unit connected to the dust hood, and the dust hood is located above the reverse conveying part.

[0061] Furthermore, the dust hood is located obliquely above the reverse conveying portion.

[0062] Beneficial effects: The waste mulch film recycling and impurity removal method of the present application can realize the automated operation from cutting to separation of materials, with less manual participation and a high degree of automation, and can realize the recycling and impurity removal of large quantities of waste mulch films.

[0063] The waste mulch film recycling and impurity removal method of the present application utilizes the different specific gravities of mulch film and cotton to achieve separation of cotton and mulch film, with a separation efficiency of more than 90%. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 This is a schematic diagram of the waste mulch film recovery and impurity removal system;

[0065] Figure 2 This is a schematic diagram of the waste film separation and recovery system;

[0066] Figure 3 This is an enlarged view of area A;

[0067] Figure 4 It is a schematic diagram of a vertical feeding unit and a spring unit;

[0068] Figure 5 This is an enlarged view of area B;

[0069] Figure 6 This is an enlarged view of area C;

[0070] Figure 7 This is a schematic diagram of the steps for waste mulch film recycling and impurity removal. DETAILED DESCRIPTION

[0071] Reference numerals: 1 cutting unit; 2 breaking unit; 3 screening unit;

[0072] 4 vertical film-slag separator; 4.1 bin; 4.1.1 feed inlet; 4.1.2 discharge outlet; 4.2 induced draft fan; 4.3 discharge outlet; 4.4 frame; 4.5 first straw conveying unit; 4.6 location of bellows unit; 4.6.1 bellows unit; 4.7 air supply bellows; 4.8 vertical conveying unit; 4.8.1 upper sprocket; 4.8.2 lower sprocket; 4.8.3 chain; 4.8.4 metal mesh; 4.8.5 strip plate; 4.8.6 separation rod; 4.9 rotating roller;

[0073] 5 reverse conveying unit; 5.1 first reverse conveying unit; 5.2 second reverse conveying unit; 5.3 second straw conveying unit;

[0074] 6. Dust removal unit; 6.1 Dust hood;

[0075] 7. Film conveying unit;

[0076] 8.1 first material conveying unit; 8.2 second material conveying unit; 8.3 third material conveying unit;

[0077] In the figure, A is the blowing direction of the bellows unit and the air supply bellows; B is the direction of material conveying by the first reverse conveying unit; C is the direction of material conveying by the second reverse conveying unit; and D is the direction of material conveying by the ground film conveying unit.

[0078] like Figure 1-6As shown: a waste land film recovery and impurity removal system, including a slitting unit 1, a breaking unit 2, a screening unit 3 and a waste land film separation and recovery system; the slitting unit 1 is a hydraulic slitting machine; the screening unit 3 is a drum screening unit; the waste land film separation and recovery system includes a vertical film residue separator 4, an air supply unit and a reverse conveying unit 5, the vertical film residue separator includes a vertically arranged bin body 4.1, the bottom of the bin body 4.1 has a discharge port, the bin body 4.1 includes a first side surface with a feed port 4.1.1 and a second side surface with a discharge port 4.1.2, the first side surface and the second side surface are opposite, and a bellows unit is installed in the bin body 4.1, and the bellows unit can blow air to the discharge port 4.1.2.

[0079] like Figure 4-6 As shown, a vertical feeding unit and a material ejecting unit are installed in the warehouse body, and the vertical feeding unit includes an upper rotating shaft, a lower rotating shaft, two upper sprockets 4.8.1 installed at the upper rotating shaft, two lower sprockets 4.8.2 installed at the lower rotating shaft, and a rotating shaft driving unit for driving the upper rotating shaft or the lower rotating shaft to rotate, a chain 4.8.3 is connected between the upper sprocket 4.8.1 and the lower sprocket 4.8.2 on the same side, a metal mesh 4.8.4 is connected between the two chains 4.8.3, the bellows unit 4.6.1 is located above the lower rotating shaft and is surrounded by the metal mesh 4.8.4, a plurality of strip plates 4.8.5 are connected between the two chains, and a plurality of separation rods 4.8.6 are installed at each strip plate 4.8.5; the material ejecting unit includes a plurality of rotating rollers 4.9 installed in the warehouse body, and the rotating rollers 4.9 can abut against the ends of the separation rods 4.8.6 and allow the separation rods 4.8.6 to pass through.

[0080] The air supply unit includes an air supply bellows 4.7 located below the bellows unit, and the air supply bellows 4.7 can be used to blow air toward the material discharged from the discharge port; the reverse conveying part 5 includes a first reverse conveying unit 5.1, a second reverse conveying unit 5.2 and a second straw conveying unit 5.3, the second reverse conveying unit 5.2 is located below the first reverse conveying unit 5.1, and the second straw conveying unit 5.3 is located below the second reverse conveying unit 5.2; the conveying directions of the first reverse conveying unit 5.1 and the second reverse conveying unit 5.2 are the same, and the conveying directions of the first reverse conveying unit 5.1 and the ground film conveying unit 7 are opposite. The ground film conveying unit 7 is located below the second reverse conveying unit 5.2; the first reverse conveying unit 5.1 is located 1-1.5 meters below the air supply bellows 4.7; the second reverse conveying unit 5.2 is located 0.4-06 meters below the first reverse conveying unit 5.1; the second reverse conveying unit 5.2 is 0.5-1 meter longer than the first reverse conveying unit 5.1; the end of the first reverse conveying unit 5.1 close to the warehouse body 4.1 is the first end, and the other end is the second end, the end of the second reverse conveying unit 5.2 close to the warehouse body 4.1 is the first end, and the other end is the second end, The first end of the first reverse conveying unit 5.1 is closer to the silo than the first end of the second reverse conveying unit; the first end of the first reverse conveying unit 5.1 and the first end of the second reverse conveying unit 5.2 are both located above the second straw conveying unit 5.3; the bellows unit and the air supply bellows 4.7 both have a plurality of strip-shaped air outlets; the wind speed of the bellows unit is 20-30m / s, and the wind speed of the air supply bellows 4.7 is 30-50m / s; an induced draft fan is installed on the top of the silo 4.1, and the induced draft fan 4.2 sucks air, and the wind speed of the induced draft fan 4.2 is 2-5m / s. The cut materials of the cutting unit 1 are transported to the scattering unit 2 by the first material conveying unit 8.1, and the materials scattered by the scattering unit 2 are transported to the screening unit 3 by the second material conveying unit 8.2, and the materials screened by the screening unit 3 are transported to the feed inlet of the waste film separation and recovery system by the third material conveying unit 8.3.

[0081] like Figure 7 As shown, the waste mulch film recycling and impurity removal method of the present application comprises the following steps:

[0082] 1) Cutting the mixed waste mulch film;

[0083] 2) Break up the cut materials;

[0084] 3) Screening the dispersed materials to remove soil from the materials;

[0085] 4) The screened materials are separated by a vertical membrane slag separator; the vertical membrane slag separator comprises a vertically arranged bin body 4.1, the bottom of the bin body 4.1 is provided with a discharge port 4.3, the bin body 4.1 comprises a first side surface with a feed port 4.1.1 and a second side surface with a discharge port 4.1.2, the first side surface and the second side surface are opposite, a bellows unit is installed in the bin body 4.1, the bellows unit can blow air toward the discharge port 4.1.2 (blow the materials out of the discharge port 4.1.2); the bellows unit and the air supply bellows 4.7 are used to blow air toward the materials coming out of the discharge port 4.1.2 at the same time. The outlet wind speed of the bellows unit is 20-30m / s, and the outlet wind speed of the air supply bellows 4.7 is 30-50m / s. The induced draft fan 4.2 performs air suction, and the wind speed of the induced draft fan 4.2 is 2-5 m / s. In the step 4), the induced draft fan 4.2 performs air suction operation at the same time.

[0086] 5) The material discharged from the discharge port 4.3 is recovered by the first straw conveying unit 4.5, and the ground film discharged from the discharge port 4.1.2 is recovered by the ground film conveying unit 7. Thus, the material discharged from the discharge port 4.1.2 and falling on the first reverse conveying unit 5.1 or the second reverse conveying unit 5.2 is conveyed to the second straw conveying unit 5.3 and recovered by the second straw conveying unit 5.3.

[0087] Step 6) feeding the materials of the first straw conveying unit 4.5 and the second straw conveying unit 5.3 again from the feed inlet 4.1.1 of the vertical membrane slag separator for secondary separation;

[0088] Step 7) Manually sorting the materials in the first straw conveying unit 4.5 and the second straw conveying unit 5.3 to separate the ground film;

[0089] Step 8) separating the materials after the mulch film is sorted out in step 7) to separate cotton and straw.

[0090] In addition, the material after step 1) is transported by the first material conveying unit 8.1 to the location where step 2) is performed; the material after step 2) is transported by the second material conveying unit 8.2 to the drum screen unit; the material after step 3) is transported by the third material conveying unit 8.3 to the feed port of the vertical membrane slag separator.

[0091] Specific principle: After the recycled mixed waste mulch is cut by a hydraulic slitting machine and / or a gantry cutter, 90% of the mulch is cut to less than 700mm; the cut materials fall into the silo and pass through the disintegration device to break up the cut lumped materials, and then the materials are transported to the drum screen with an aperture of 20-40mm through a conveyor belt to remove the soil. The waste mulch without soil is transported to the vertical mulch slag separator, and the materials are transported vertically in the vertical conveying unit, and the separation rod can shake due to the shaking of the rotating roller, which is conducive to separating the waste mulch into three categories: straw cotton, straw and large pieces of cotton, and dust. The mixture of mulch and cotton is blown out from the inside of the mulch slag separator at the discharge port of the mulch slag separator at 20-30m / s. A supplementary air bellows for secondary air supply is installed directly below the outlet of the bellows unit for film-residue separation. The outlet side of the supplementary air bellows discharges air through a 1-3mm linear outlet, and the wind is blown out evenly. The outlet wind speed is 30-50m / s. The purpose is to further utilize the action of wind to separate the ground film and large pieces of cotton stalks and other materials blown off by the film-residue separator, and the film and cotton; at the same time, a first reverse conveying unit with a conveying direction opposite to the movement direction of the blown-out material is installed 1-1.5m below the supplementary air bellows. The length of the first reverse conveying unit is about 1-2m. A second reverse conveying unit is installed 40-60cm below the first reverse conveying unit. The purpose is to further convey some separated cotton and other impurities to the second straw conveying unit, so as to realize the fine separation of film, cotton and straw, and utilize the different specific gravity of ground film and cotton to realize the separation of cotton and ground film, and the separation efficiency reaches more than 90%. There is an induced draft fan at the top, and the induced draft speed is 2-5m / s. The top induced draft also achieves a certain degree of negative pressure in the sorting bin to prevent a large amount of dust from flying under positive pressure. Through this process, the waste film resources can be separated efficiently.

[0092] Although the present invention has been illustrated and described with respect to the preferred embodiments, it will be appreciated by those skilled in the art that various changes and modifications may be made to the present invention without departing from the scope of the present invention as defined by the claims.

Claims

1. A method for recycling and removing impurities from waste mulch film, characterized in that: The steps include: 1) Cutting the mixed waste mulch film; 2) Break up the cut materials; 3) Screening the dispersed materials to remove soil from the materials; 4) Separating the screened materials by using a vertical membrane slag separator; the vertical membrane slag separator comprises a vertically arranged bin body, the bottom of the bin body has a feed outlet, the bin body comprises a first side surface having a feed inlet and a second side surface having a discharge outlet, the first side surface and the second side surface are opposite, a bellows unit is installed in the bin body, and the bellows unit can blow air toward the discharge outlet; 5) The material discharged from the discharge port is recovered by the first straw conveying unit, and the ground film discharged from the discharge port is recovered by the ground film conveying unit.

2. The method for recycling and removing impurities from waste mulch film according to claim 1, characterized in that: It also includes an air supply bellows located below the bellows unit, which can be used to blow air toward the material discharged from the discharge port; in the step 4), the bellows unit and the air supply bellows are simultaneously used to blow air toward the material discharged from the discharge port.

3. The method for recycling and removing impurities from waste mulch film according to claim 2, characterized in that: It also includes a reverse conveying part, which includes a first reverse conveying unit, a second reverse conveying unit and a second straw conveying unit, the second reverse conveying unit is located below the first reverse conveying unit, and the second straw conveying unit is located below the second reverse conveying unit; the conveying directions of the first reverse conveying unit and the second reverse conveying unit are the same, and the conveying directions of the first reverse conveying unit and the ground film conveying unit are opposite; in the step 5), the material coming out of the discharge port and falling on the first reverse conveying unit or the second reverse conveying unit is conveyed to the second straw conveying unit and recovered by the second straw conveying unit.

4. The method for recycling and removing impurities from waste mulch film according to claim 3, characterized in that: The mulch conveying unit is located below the second reverse conveying unit; the first reverse conveying unit is located 1-1.5 meters below the air supply bellows; the second reverse conveying unit is located 0.4-06 meters below the first reverse conveying unit; the second reverse conveying unit is 0.5-1 meter longer than the first reverse conveying unit; the end of the first reverse conveying unit close to the warehouse body is the first end, and the other end is the second end, the end of the second reverse conveying unit close to the warehouse body is the first end, and the other end is the second end, and the first end of the first reverse conveying unit is closer to the warehouse body than the first end of the second reverse conveying unit; the first end of the first reverse conveying unit and the first end of the second reverse conveying unit are both located above the second straw conveying unit.

5. The method for recycling and removing impurities from waste mulch film according to claim 2, characterized in that: The bellows unit and the air supply bellows both have a plurality of strip-shaped air outlets; the air outlet speed of the bellows unit is 20-30m / s, and the air outlet speed of the air supply bellows is 30-50m / s; an induced draft fan is installed on the top of the warehouse body, and the induced draft fan sucks air, and the wind speed of the induced draft fan is 2-5m / s. In the step 4), the induced draft fan simultaneously performs a suction operation.

6. The method for recycling and removing impurities from waste mulch film according to claim 3, characterized in that: The following steps are also included: Step 6) feeding the materials of the first straw conveying unit and the second straw conveying unit again from the feed inlet of the vertical membrane-slag separator for secondary separation; Step 7) manually sorting the materials in the first straw conveying unit and the second straw conveying unit to separate the ground film; Step 8) separating the materials after the mulch film is sorted out in step 7) to separate cotton and straw.

7. The method for recycling and removing impurities from waste mulch film according to claim 1, characterized in that: The slitting operation in the step 1) is performed by a hydraulic slitting machine or a gantry cutter; the breaking up operation in the step 2) is performed by a material breaking up unit; the screening unit is a drum screening unit; the material after the step 1) is transported by the first material conveying unit to the position where the step 2) is performed; the material after the step 2) is transported by the second material conveying unit to the drum screening unit; the material after the step 3) is transported by the third material conveying unit to the feed port of the vertical membrane slag separator.

8. The method for recycling and removing impurities from waste mulch film according to claim 1, characterized in that: A vertical feeding unit and a material ejection unit are installed in the warehouse body, and the vertical feeding unit includes an upper rotating shaft, a lower rotating shaft, two upper sprockets installed at the upper rotating shaft, two lower sprockets installed at the lower rotating shaft, and a rotating shaft driving unit for driving the upper rotating shaft or the lower rotating shaft to rotate, a chain is connected between the upper sprocket and the lower sprocket on the same side, a metal mesh is connected between the two chains, the bellows unit is located above the lower rotating shaft and surrounded by the metal mesh, a plurality of strip plates are connected between the two chains, and a plurality of separation rods are installed at each strip plate; the material ejection unit includes a plurality of rotating rollers installed in the warehouse body, the rotating rollers can abut against the ends of the separation rods and allow the separation rods to pass through.

9. A waste mulch film separation and recovery system, characterized in that: It includes a vertical film-residue separator, an air supply unit, a reverse conveying part and a ground film conveying unit, the vertical film-residue separator includes a vertically arranged bin body, the bottom of the bin body is provided with a discharge port, the bin body includes a first side surface with a feed port and a second side surface with a discharge port, the first side surface and the second side surface are opposite, a bellows unit is installed in the bin body, and the bellows unit can blow air toward the discharge port; the air supply unit includes an air supply bellows located below the bellows unit, and the air supply bellows can be used to blow air toward the material discharged from the discharge port; the reverse conveying part includes a first reverse conveying unit, a second reverse conveying unit and a second straw conveying unit, the second reverse conveying unit is located below the first reverse conveying unit, and the second straw conveying unit is located below the second reverse conveying unit; the conveying directions of the first reverse conveying unit and the second reverse conveying unit are the same, and the conveying directions of the first reverse conveying unit and the ground film conveying unit are opposite.

10. The waste land film separation and recovery system according to claim 9, characterized in that: A vertical feeding unit and a material ejection unit are installed in the warehouse body, and the vertical feeding unit includes an upper rotating shaft, a lower rotating shaft, two upper sprockets installed at the upper rotating shaft, two lower sprockets installed at the lower rotating shaft, and a rotating shaft driving unit for driving the upper rotating shaft or the lower rotating shaft to rotate, a chain is connected between the upper sprocket and the lower sprocket on the same side, a metal mesh is connected between the two chains, the bellows unit is located above the lower rotating shaft and surrounded by the metal mesh, a plurality of strip plates are connected between the two chains, and a plurality of separation rods are installed at each strip plate; the material ejection unit includes a plurality of rotating rollers installed in the warehouse body, the rotating rollers can abut against the ends of the separation rods and allow the separation rods to pass through.

11. The waste land film separation and recovery system according to claim 9, characterized in that: The ground film conveying unit is located below the second reverse conveying unit; the first reverse conveying unit is located 1-1.5 meters below the air supply bellows; the second reverse conveying unit is located 0.4-06 meters below the first reverse conveying unit; the second reverse conveying unit is 0.5-1 meter longer than the first reverse conveying unit; the end of the first reverse conveying unit close to the warehouse body is the first end, and the other end is the second end, the end of the second reverse conveying unit close to the warehouse body is the first end, and the other end is the second end, the first reverse conveying The first end of the delivery unit is closer to the warehouse body than the first end of the second reverse conveying unit; the first end of the first reverse conveying unit and the first end of the second reverse conveying unit are both located above the second straw conveying unit; the bellows unit and the air supply bellows both have a plurality of strip air outlets; the air outlet speed of the bellows unit is 20-30m / s, and the air outlet speed of the air supply bellows is 30-50m / s; an induced draft fan is installed on the top of the warehouse body, and the induced draft fan sucks air, and the wind speed of the induced draft fan is 2-5m / s.

12. A waste mulch film recovery and impurity removal system, characterized in that: It comprises a cutting unit, a breaking up unit, a screening unit and the waste film separation and recovery system as described in any one of claims 9 to 11; the cut material of the cutting unit is transported to the breaking up unit by a first material conveying unit, the broken material of the breaking up unit is transported to the screening unit by a second material conveying unit, and the screened material of the screening unit is transported to the feed inlet of the waste film separation and recovery system by a third material conveying unit.

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