Mulching film multi-stage separation and recovery method and system

Abstract

The invention discloses a mulching film multi-stage separation and recovery method and system. The method comprises the steps that first screening is conducted on part of waste of materials, and first discharging is conducted on the part of waste separated in the first screening process; carrying out first fragmentation and scattering on the materials subjected to first discharge, separating the materials and a part of waste materials by utilizing blowing assistance, and carrying out second discharge on a part of waste materials separated in the blowing assistance process; carrying out second fragmentation and friction washing on the material subjected to the second discharge, and carrying out second screening on a part of waste materials on the material subjected to the friction washing to obtain a mulching film separated from the waste materials; through the treatment steps of multi-step separation, cleaning, fragmentation, scattering, friction washing and the like, separation of materials and waste materials is effectively achieved, and recycling or reutilization of resources is facilitated.

Description

Technical Field

[0001] The present application relates to the field of ground film recovery, and more specifically to a ground film multi-stage separation and recovery method and system. Background Art

[0002] At present, most of the waste plastic film recycling and treatment adopts water washing. However, in cotton-growing areas in Xinjiang, the ground film is usually attached with a large amount of impurities such as sand, straw and cotton, and the water washing process is difficult to effectively remove these attachments. Due to the poor cleaning effect, the waste plastic film cannot meet the pure recycling standards and is therefore not suitable for subsequent recycling applications such as granulation. The defects of this prior art seriously limit the reuse rate of plastic film and increase the difficulty and cost of waste treatment. Summary of the invention

[0003] The present application provides a method and system for multi-stage separation and recovery of ground film, which can effectively separate ground film and waste materials, thus facilitating the recovery or reuse of resources.

[0004] In the first aspect, the present application provides a method for multi-stage separation and recovery of ground film, comprising: a first screening of a portion of waste materials and a first discharge of the portion of waste materials separated during the first screening process; a first crushing and breaking up of the material after the first discharge, using blowing to separate the material and a portion of waste materials and a second discharge of the portion of waste materials separated during the blowing process; and a second crushing and friction washing of the material after the second discharge, and a second screening of a portion of waste materials after the friction washing to obtain a ground film separated from the waste materials; there is no need to consume a large amount of water for cleaning the waste film, and the three-stage dry separation has a good effect, which is conducive to subsequent granulation and other applications.

[0005] In an optional scheme of the first aspect, the first screening includes: a first step screening and a second step screening of a portion of the material for waste; wherein, during the first step screening, the material is screened for waste smaller than a first preset size, and the screened material is subjected to a second step screening; and during the second step screening, the material is screened for waste smaller than a second preset size.

[0006] In an optional scheme of the first aspect, the first discharge includes: a first discharge and a second discharge of a portion of the waste separated in the first screening process; wherein, during the first discharge, the waste separated in the first screening process is sucked out and the slag is removed by belt conveyor; and during the second discharge, the waste separated in the second screening process is sucked out and the slag is removed by belt conveyor.

[0007] In an optional scheme of the first aspect, the blowing includes: a first step of blowing and a second step of blowing for a portion of the waste after the material is dispersed; wherein, during the first step of blowing, the material is transported in one direction by means of blowing, and a portion of the waste is separated from the material during the transportation process; during the second step of blowing, the separated material and a portion of the waste are transported in reverse, and the material and the waste are stored separately.

[0008] In an optional scheme of the first aspect, the second discharge includes: a third-step discharge and a fourth-step discharge of a portion of the waste separated during the blowing process; wherein, during the third-step discharge, the waste separated during the first-step blowing process is suctioned and the slag is removed by belt conveyor; and during the fourth-step discharge, the waste separated during the second-step blowing process is suctioned and the slag is removed by belt conveyor.

[0009] In an optional scheme of the first aspect, friction washing includes: a first step of friction washing and a second step of friction washing on the crushed material; wherein, during the first step of friction washing, the crushed material is friction washed; and during the second step of friction washing, the material that has passed the first step of friction washing is friction washed.

[0010] In the second aspect, the present application provides a multi-stage separation and recovery system for ground film, comprising: a screening device, the screening device is used to perform a first screening and a second screening of a part of waste on the material; a discharging device, the discharging device is connected to the screening device, and is used to perform a first discharge of a part of waste separated in the first screening process and a second discharge of a part of waste separated in the blowing separation process; a shredding device, the shredding device is used to perform a first crushing of the material after the first discharge and a second crushing of the material after the second discharge; a scattering device, the scattering device is used to scatter the material after the first crushing; an air chamber, the air chamber is used to separate the material and a part of the waste by using blowing; and a friction washing device, the friction washing device is used to friction wash the material after the second crushing.

[0011] In an optional scheme of the second aspect, the screening device includes: a first screening component, which is used to perform a first step screening of the material for waste materials smaller than a first preset size; a second screening component, which is used to perform a second step screening of the material for waste materials smaller than a second preset size; the discharging device includes: a first dust removal component, which is respectively connected to the first screening component and the second screening component, and is used to absorb a portion of the waste separated during the first screening process; and a first conveying component, which is respectively connected to the first screening component and the second screening component, and is used to discharge a portion of the waste separated during the first screening process.

[0012] In an optional scheme of the second aspect, the wind chamber includes: a first airflow zone and a second airflow zone; a first wind blowing component, the first wind blowing component is used to provide an airflow for separating materials and waste in the first airflow zone; a second wind blowing component, the second wind blowing component is used to provide an airflow for separating materials and waste in the second airflow zone; the discharge device also includes: a second dust removal component, the second dust removal component is respectively connected to the first airflow zone and the second airflow zone, and is used to absorb a part of the waste separated during the blowing process; a second conveying component, the second conveying component is respectively connected to the first airflow zone and the second airflow zone, and is used to discharge a part of the waste separated during the blowing process.

[0013] In an optional scheme of the second aspect, the friction washing device includes: a first friction washing component, which is used to perform a first step of friction washing on the second crushed material; a second friction washing component, which is used to perform a second step of friction washing on the material after the first step of friction washing; and a third screening component, which is used to perform a second screening of waste materials on the material after friction washing.

[0014] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate one or more embodiments of the present application and, together with the description, serve to explain the principles of the present application and to enable one of ordinary skill in the relevant art to make and use the present application.

[0016] Figure 1 is a flow chart of an exemplary multi-stage separation and recovery method of ground film according to some embodiments of the present application;

[0017] Figure 2 is a flow chart of an exemplary screening method according to some embodiments of the present application;

[0018] Figure 3 is a flow chart of an exemplary discharge method according to some embodiments of the present application;

[0019] Figure 4 is a flow chart of an exemplary blowing-assisted separation method according to some embodiments of the present application;

[0020] Figure 5 is a flow chart of an exemplary discharge method according to some embodiments of the present application;

[0021] Figure 6 is a flow chart of an exemplary friction washing separation method according to some embodiments of the present application;

[0022] Figure 7is a schematic structural diagram of an exemplary drum screen separation system according to some embodiments of the present application;

[0023] Figure 8 is a schematic structural diagram of an exemplary dust removal assembly according to some embodiments of the present application;

[0024] Fig. 9 is a top view of an exemplary drum screen separation system according to some embodiments of the present application;

[0025] Fig.10 is a schematic structural diagram of an exemplary air separation system according to some embodiments of the present application;

[0026] Fig.11 is a top view of an exemplary air separation system according to some embodiments of the present application;

[0027] Fig.12 is a schematic structural diagram of an exemplary mechanical friction washing and separation system according to some embodiments of the present application;

[0028] Fig.13 is a schematic structural diagram of an exemplary vibrating screen separation system according to some embodiments of the present application;

[0029] Fig.14 is a top view of an exemplary mechanical friction washing separation system and a vibrating screen separation system according to some embodiments of the present application. DETAILED DESCRIPTION

[0030] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the present application will be more comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application.

[0031] This example provides a multi-stage separation and recovery method for agricultural mulch film, which is mainly divided into a three-stage dry separation process, specifically including three processing processes: drum screen separation, air separation, and mechanical friction washing.

[0032] S1: Drum screen separation process

[0033] The materials processed in this example include waste plastic mulch, sand, straw, cotton bolls and dust, among which waste plastic mulch is the main material required for this example, and the remaining components can be regarded as waste. Figure 1As shown, in the drum screen separation process, the drum screen separates materials of different sizes by size through rotation screening. When the waste rolls on the surface of the screen, the waste smaller than the screen hole will quickly pass through the screen hole and be separated from other materials. Specifically, the drum screen is used to perform the first screening of a part of the waste and the first discharge of the waste, that is, a part of the waste is screened out from the material. It can be understood that the waste refers to sand, straw and cotton bolls. The waste also has a certain recycling value, for example, sand has planting value. The separated waste will be automatically discharged when the drum screen rotates, making the process more continuous and automated, while avoiding the accumulation of waste in the equipment, and then the material that has passed the first screening is sent to the air separation process.

[0034] It can be imagined that when processing materials of different components, the drum screen can adjust the size of the sieve holes as needed to achieve customized screening. In this way, waste materials can be accurately separated from the materials, thereby improving the screening accuracy of the entire process.

[0035] S2: Air separation process

[0036] like Figure 1 As shown, in the air separation process, the first crushing treatment is first performed on the material after the first discharge. It should be noted that the material after the first discharge refers to the material after a part of the waste is discharged. It can be understood that in the material after the first crushing, the lighter material is more easily separated by the airflow. After crushing, the material size is reduced, and the suspension characteristics of materials of different weights are more significant, which helps the airflow-assisted blowing separation to be more efficient. The crushed materials may adhere to or agglomerate with each other. Before the blowing separation, the first crushed materials are first broken up. The breaking process further disperses the materials through mechanical vibration, rolling or impact to ensure that the individual materials are independent. This step makes the waste and the main material more evenly distributed, providing ideal conditions for blowing separation. Finally, the blow-assisted separation is used to separate the broken materials and a part of the waste, and the lighter main material is separated from the heavier waste by airflow. During the blowing process, the waste is discharged for the second time, and the material separated by blowing is sent to the mechanical friction washing separation process. This separation process of crushing-disintegration-assisted blowing is progressive, making the separation more accurate and efficient, making full use of the advantages of each step and providing high-purity materials for subsequent processing.

[0037] It is conceivable that the air separation process can separate the lighter main material from the heavier waste material by adjusting the air flow speed and angle according to the weight difference of the crushed material, thereby improving the separation accuracy and, at the same time, increasing the flexibility of the separation process.

[0038] S3: Mechanical friction washing separation process

[0039] like Figure 1As shown, in the mechanical friction washing separation process, the material is first subjected to a second crushing treatment. It can be understood that in the air separation process, the first crushing initially reduces the size of the material, reducing the requirements for subsequent crushing. In this way, the second crushing can be more efficient for smaller materials. In addition, distributed crushing can avoid excessive crushing caused by one-time crushing, and distributed crushing can obtain a more uniform particle distribution, thereby improving the quality of the finished material. Then the material after the second crushing treatment is subjected to mechanical friction washing. The force of mechanical friction can remove waste and impurities attached to the material, thereby achieving an effective separation effect. In particular, for light or fine waste, the friction effect can better separate it from the main material. It can be understood that the main material refers to ground film. Compared with traditional water washing, mechanical friction washing does not require the use of a large amount of water or chemical reagents, which saves resources and reduces the burden of wastewater treatment, and is more environmentally friendly. This example can complete waste separation through a simple mechanical friction process. The process is relatively direct and easy to operate, and is suitable for integration into a continuous production process. Finally, the material after friction washing is subjected to a second screening to obtain the desired ground film.

[0040] Drum screen grading

[0041] In another specific example, a classification step is added to the drum screen separation process, specifically, Figure 2 As shown, S11: the first screening includes the first screening and the second screening. The material contains sand, straw and cotton bolls of different sizes. The first screening uses a small-aperture screen to first screen out waste materials smaller than the first preset size and separate them from the material. The first screening mainly removes sand, which can be used to improve the soil and increase the organic matter content of the soil. S12: the remaining material passes through a large-aperture screen to further screen out waste materials smaller than the second preset size and separate them from the material. The second screening mainly removes straw and cotton bolls, wherein the first preset size is smaller than the second preset size. This small-to-large graded screening method can fully recover small-particle waste and effectively exclude large-particle waste, making the screening process more economical and targeted, and providing high-quality raw materials for subsequent processing processes.

[0042] like Figure 3 As shown, in the drum screen grading process, the dust removal and waste treatment measures corresponding to the grading screening include the first step of discharge S13 and the second step of discharge S14. Specifically, in the first screening process, fine waste (such as dust, etc.) will be generated with the flow of air. The use of a dust collector can effectively absorb this part of the waste and prevent it from being mixed into the material again. The larger particles of waste (such as sand, straw and cotton bolls, etc.) separated by the drum screen are conveyed to the waste treatment area by a belt.

[0043] It is understandable that a large amount of dust will be generated in a large-scale screening process, so two independent dust collectors can be used for the first screening step and the second screening step; for a small-scale screening process, one dust collector can be used.

[0044] It is conceivable that a cyclone separation step is added between the drum screening and the dust collector suction, using the principle of centrifugal force to separate larger particles from the air flow.

[0045] Blowing Assist Classification

[0046] In another specific example, for the air separation process, a classification step is added, specifically, Figure 4 As shown, the blowing process includes the first blowing process and the second blowing process. S21: In the first blowing process, a preset airflow intensity is set first, and the airflow blows the material to the second blowing area. The airflow not only pushes the material forward, but also has a certain dust-raising effect, which helps to separate the lighter dust particles from the material. At the same time, the equipped conveyor belt ensures that the material moves forward steadily during the movement to avoid deviation or accumulation due to airflow disturbance; S22: After the material enters the second blowing area, the airflow acts on the material to push it along the set conveying direction. In this process, the blowing conveying The force and direction can be adjusted, which can maintain the advancement of the material and keep the falling trajectory of materials of different weights to achieve hierarchical separation. Two reverse-running conveyor belts are set below this area. The two reverse-running conveyor belts are used to receive materials of different weights respectively. Specifically, the heavier material will fall onto one conveyor belt first due to its greater inertia, and the lighter material will fall farther away and be received by another conveyor belt in the opposite direction. In this way, the two conveyor belts separate materials of different weights in opposite directions and transport them to different collection areas respectively, achieving a clear grading effect.

[0047] In the blowing and classification process, the dust removal and waste treatment measures corresponding to the classification and blowing include the first step discharge and the second step discharge. Figure 5 As shown, S23: during the first step of blowing, the material moves to the second step of blowing area under the push of the airflow, and a dust collector is used to absorb the dust raised by the airflow. The dust collector effectively absorbs the dust and light particles on the surface of the material through the dust suction port arranged on the material conveying path; S24: during the second step of blowing, the dust collector is also used to absorb the dust raised by the airflow, and the conveyor belt for receiving the waste is connected to a waste conveyor belt to realize the discharge of the waste.

[0048] Mechanical friction washing classification

[0049] In another specific example, for the mechanical friction washing separation process, a classification step is added, specifically, Figure 6As shown, friction washing includes a first step friction washing and a second step friction washing, S31: in the first step friction washing process, no liquid medium is introduced, and the waste is removed by relying on the force generated by friction. During the friction washing process, the kinetic energy of the waste is continuously peeled off and released due to the friction; S32: the second step friction washing is carried out simultaneously with the first step friction washing. In this step, no liquid medium is introduced, and friction is continued to be used to remove waste on the surface of the material. The second step friction washing receives the material after the first step friction washing. Through further friction and collision in the second step friction washing, the cleanliness of the material is further improved.

[0050] This example provides a multi-stage separation and recovery system for ground film, including a screening device, a discharging device, a shredding device, a breaking up device, a wind chamber and a friction washing device. The screening device is used to perform a first screening and a second screening of a part of waste materials on the material. The discharging device is connected to the screening device, and is used to perform a first discharge of a part of waste materials separated in the first screening process and a second discharge of a part of waste materials separated in the blowing separation process. The shredding device is used to perform a first crushing of the material after the first discharge and a second crushing of the material after the second discharge. The breaking up device is used to break up the material after the first crushing. The wind chamber is used to separate the material and a part of waste materials by blowing. The friction washing device is used to friction wash the material after the second crushing.

[0051] Part of the system that handles the trommel separation process

[0052] This example describes the separation and recovery system in the order of the separation and recovery process. In the drum screen separation process:

[0053] like Figure 7 As shown, the screening device includes a first screening component 11 and a second screening component 12. The first screening component 11 and the second screening component 12 adopt a drum screen design. In this example, waste mulch accounts for about 15% of the total material, and waste accounts for about 85% of the total material. The screen aperture of the first screening component 11 is smaller than the screen aperture of the second screening component 12, and the material is graded according to size to achieve separation of the waste. The first screening component 11 is used to screen out sand and soil, and the second screening component 12 is used to screen out straw and cotton bolls. The drum screen body is made of metal material, usually a cylindrical drum shell, and the drum screen body is inclined so that the material in the screening process rolls downward under the sorting effect, which helps to evenly distribute the material in the drum and improve the screening effect.

[0054] Furthermore, the first screening assembly 11 includes a first box body and a first drum screen, a first mounting frame is provided in the first box body, and the first drum screen is installed on the first mounting frame, the second screening assembly 12 includes a second box body and a second drum screen, a second mounting frame is provided in the second box body, and the second drum screen is installed on the second mounting frame, and a plurality of openings are opened on the first box body and the second box body.

[0055] like Figure 7 As shown, the discharging device includes a first dust removal component 21 and a first conveying component 22. The first dust removal component 21 is used to absorb dust generated during the first screening process. The first dust removal component 21 includes a first pipeline 211, a first dust collector 212, a first dust removal belt 213, a second pipeline 214, a second dust collector 215 and a second dust removal belt 216. One end of the first pipeline 211 is connected to the first screening component 11, and the other end thereof is connected to the first dust collector 212. The first dust removal belt 213 is connected to the discharge end of the first dust collector 212. One end of the second pipeline 214 is connected to the second screening component 12, and the other end thereof is connected to the second dust collector 215. The second dust removal belt 216 is connected to the second dust collector 2 15 is connected to the discharge end; the first conveying component 22 is used to discharge the sand, straw and cotton bolls separated in the first screening process, and the first conveying component 22 includes a first slag discharge belt 221 and a second slag discharge belt 222. The first slag discharge belt 221 is arranged below the first screening component 11, and receives the waste discharged from the discharge port below the first screening component 11, which is mainly sand, and the conveying direction of the first slag discharge belt 221 is consistent with the axial direction of the first roller component, and the second slag discharge belt 222 is arranged below the second screening component 12, and receives the waste discharged from the discharge port below the second screening component 12, which is mainly straw and cotton bolls, and the conveying direction of the second slag discharge belt 222 is consistent with the axial direction of the second roller component.

[0056] For the dust removal component, this example provides a cyclone separator structure, such as Figure 8 As shown, the first dust removal component 21 can adopt this structure. Specifically, the dust removal component includes a first branch 01, a cyclone bucket 02, a second branch 03, a dust removal fan 04, a dust collector 05 and a dust removal belt 06. Taking the first screening component 11 as an example, one end of the first branch 01 is connected to the discharge port above the first screening component 11, and the other end thereof is connected to the side opening of the cyclone bucket 02. One end of the second branch 03 is connected to the top opening of the cyclone bucket 02, and the other end thereof is connected to the inlet end of the dust collector 05. The dust removal fan 04 is arranged in the middle section of the second branch 03, and the dust removal belt 06 is connected to the discharge end of the dust collector 05.

[0057] Furthermore, flange connections or sealed joints are used between the branches to ensure that there is no gas leakage under high negative pressure operating conditions. The first branch 01 is connected to the upper side of the cyclone bucket 02 as an air inlet pipeline, and the end close to the cyclone bucket 02 is designed to be cut at a downward bevel angle so that the airflow can enter the cyclone bucket 02 along the tangential direction to form a rotating airflow. Due to the centrifugal force generated by the rotation, the heavier waste sinks along the wall of the cyclone bucket 02 to achieve preliminary separation. It can be imagined that a rotary valve is set at the bottom of the cyclone bucket 02, and the rotary valve can ensure that the lower part of the cyclone bucket 02 is isolated from the upper airflow. Avoid secondary dusting; the dust removal fan 04 is installed between the cyclone 02 and the dust collector 05 to provide power. The dust removal fan 04 draws the airflow in the cyclone 02 and allows the airflow to continue to enter the next-level dust collector 05, ensuring that the airflow maintains a negative pressure state in the entire structure and produces a continuous airflow cycle; the dust collector 05 is set at the end of the structure to capture smaller particles of waste. In the dust collector 05, the airflow is further filtered through a non-filter or filter element structure. The exhaust effect of the dust collector 05 increases the adsorption capacity of fine waste, so that the final discharged airflow reaches a higher degree of cleanliness.

[0058] In the structure of this cyclone separator, the cyclone bucket 02 and the dust collector 05 separate particle wastes of different sizes through graded filtration, and the dust removal fan 04 and the dust collector 05 provide dual exhaust functions, ensuring that sufficient negative pressure can be formed in each dust removal link, and the dual exhaust maintains a stable airflow path, effectively preventing airflow backflow or accumulation.

[0059] To facilitate waste removal, in another example, Fig. 9 As shown, the first conveying assembly 22 also includes a third slag discharge belt 223 and a fourth slag discharge belt 224. The third slag discharge belt 223 is connected to the first slag discharge belt 221, and the conveying direction of the third slag discharge belt 223 forms an angle of a certain angle with the conveying direction of the first slag discharge belt 221. The fourth slag discharge belt 224 is connected to the second slag discharge belt 222, and the conveying direction of the fourth slag discharge belt 224 also forms an angle of a certain angle with the conveying direction of the second slag discharge belt 222. The third slag discharge belt 223 and the fourth slag discharge belt 224 facilitate guiding the waste from the bottom of the screening device to the waste treatment area.

[0060] It is understandable that in the drum screen separation process, Figure 7As shown, the separation and recovery system also includes a feeding device, which adopts a belt transmission structure. The feeding device includes a first feeding component 71, a second feeding component 72 and a third feeding component 73. The discharge end of the first feeding component 71 is connected to the feed port of the first screening component 11 to feed the material into the first screening component 11; the feed end of the second feeding component 72 is connected to the discharge port of the first screening component 11 to receive the material after the first step of screening, and its discharge end is connected to the feed port of the second screening component 12 to feed the material after the first step of screening into the second screening component 12; the feed end of the third feeding component 73 is connected to the discharge port of the second screening component 12 to receive the material after the second step of screening and feed the material into the next step of the process.

[0061] Part of the air separation process

[0062] In the air separation process: Fig.10 and 11 As shown, the shredding device includes a first shredding component 31 and a first feeding component 32. The first shredding component 31 adopts the design of a double-axis shredder. The material enters the first shredding component 31 through the feed port. The blade of the first shredding component 31 rotates to tear and cut the material into small pieces. The shredded material flows out through the discharge port to form uniform fragments so as to enter the subsequent dispersing device 1. The first feeding component 32 feeds the shredded material into the dispersing device 1 in batches and in a quantitative manner to avoid accumulation of the material.

[0063] The scattering device 1 comprises a rotatable scatterer, and a plurality of teeth are arranged on the rotating part of the scatterer. The shredded materials fall into the scattering device 1, and the scatterer operates to push the materials to roll forward and achieve the scattering effect.

[0064] like Fig.10 As shown, the wind chamber includes a third box body 51 and a fourth box body 52. ​​The third box body 51 is connected to the first wind blowing component 53. The first wind blowing component 53 is arranged on one side of the scattering device 1. When the material rolls down from the scatterer, the first wind blowing component 53 helps to blow the material forward, and a first air flow zone is formed in the third box body 51; the feed port of the second wind blowing component 54 is connected to the discharge port of the third box body 51, and its discharge port is connected to the feed port of the fourth box body 52. ​​The second wind blowing component 54 delivers the material into the fourth box body 52, and a second air flow zone is formed in the fourth box body 52.

[0065] Another example provides a box structure such as Fig.10As shown, in the third box body 51, the third box body 51 includes a first filter 511 and a first cleaning device 512, multiple groups of first filters 511 are separated in the third box body 51, and the first cleaning device 512 is set between two first filters 511 for cleaning impurities attached to the first filters 511, and the first filter 511 separates part of the waste; in the fourth box body 52, the fourth box body 52 includes a second filter 521 and a second cleaning device 522, multiple groups of second filters 521 are separated in the fourth box body 52, and the second cleaning device 522 is set between two second filters 521 for cleaning impurities attached to the second filters 521, and the second filter 521 separates part of the waste.

[0066] like Fig.10 As shown, the discharging device also includes a second dust removal component 23 and a second conveying component 24. The second dust removal component 23 is used to absorb dust generated during the blowing process. The second dust removal component 23 includes a third pipeline 231, a third dust collector 232, a third dust removal belt 233, a fourth pipeline 234, a fourth dust collector 235, a fourth dust removal belt 236, a fifth pipeline 237, a fifth dust collector 238 and a fifth dust removal belt 239. Specifically, one end of the third pipeline 231 is connected to the third box 51, and the other end thereof is connected to the The third dust collector 232 is connected, the third dust removal belt 233 is connected to the discharge end of the third dust collector 232, one end of the fourth pipeline 234 is connected to the fourth box 52, and the other end thereof is connected to the fourth dust collector 235, the fourth dust removal belt 236 is connected to the discharge end of the fourth dust collector 235, one end of the fifth pipeline 237 is connected to the fourth box 52, and the other end thereof is connected to the fifth dust collector 238, and the fifth dust removal belt 239 is connected to the discharge end of the fifth dust collector 238, wherein the fourth dust collector 235 is connected to the fourth box 52, and the other end thereof is connected to the fifth dust collector 238. The fifth dust collector 238 jointly removes dust in the fourth box body 52; the second conveying assembly 24 includes a fifth slag discharge belt 241, a sixth slag discharge belt 242 and a seventh slag discharge belt 243, the fifth slag discharge belt 241 is arranged in the third box body 51, receives the material output by the scattering device 1 and the first wind blowing assembly 53 and transmits it to the second wind blowing assembly 54, the sixth slag discharge belt 242 and the seventh slag discharge belt 243 are arranged in the fourth box body 52, receives the material output by the second wind blowing assembly 54, wherein the sixth slag discharge belt The conveying directions of the belt 242 and the seventh slag discharge belt 243 are opposite. The sixth slag discharge belt 242 is close to the second wind blowing assembly 54. The heavier waste materials (such as straw and cotton bolls) will fall onto the sixth slag discharge belt 242 first due to their greater inertia, and the lighter materials (such as waste mulch) will fall to the seventh slag discharge belt 243 farther away. In this way, the sixth slag discharge belt 242 and the seventh slag discharge belt 243 separate materials of different weights in opposite directions and transport them to different collection areas respectively, thereby achieving a clear grading effect.

[0067] It is conceivable that the second dust removal assembly 23 may adopt the above-mentioned cyclone separator structure.

[0068] To facilitate waste removal, in another example, Fig.11 As shown, the second conveying assembly 24 also includes an eighth slag discharge belt 244, which is connected to the sixth slag discharge belt 242. The conveying direction of the eighth slag discharge belt 244 forms an angle with the conveying direction of the sixth slag discharge belt 242, which is convenient for leading the waste out of the fourth box body 52.

[0069] In order to further improve the purity of the material, in another example, Fig.11 As shown, a re-selection component 25 is added, the inlet end of the re-selection component 25 is connected to the outlet end of the eighth slag discharge belt 244, and the outlet end is connected to the third box body 51. The re-selection component 25 absorbs the waste conveyed by the eighth slag discharge belt 244 and sends it into the third box body 51 again, and this part of the waste is further separated by blowing.

[0070] It is understood that in the air separation process, Fig.10 As shown, the feeding device also includes a fourth feeding component 74 and a fifth feeding component 75. The first shredding component 31 is arranged at the discharge end of the fourth feeding component 74 and is located above the fifth feeding component 75. The first shredding component 31 puts the shredded material into the feed end of the fifth feeding component 75. The first feeding component 32 is arranged on the fifth feeding component 75. During the conveying process of the fifth feeding component 75, the material passes through the feeding component to achieve the effect of batch quantitative conveying.

[0071] Part of the system that handles the mechanical friction wash separation process

[0072] In the mechanical friction washing separation process, large particles of waste such as sand, straw and cotton bolls have been removed before the material enters the process, and small particles of waste such as Fig.12 As shown, the shredding device also includes an unpacking component 33, a second feeding component 34 and a second shredding component 35. The unpacking component 33 unpacks the wrapped material. The unpacking component 33 cuts or tears the package in the form of a cutter or a roller to release the internal material. It can be understood that if the material is not packaged, it does not need to be unpacked and can be directly put into the second feeding component 34; the second feeding component 34 controls the material flow entering the second shredding component 35. Specifically, the second feeding component 34 limits the material flow passing through by rotating the paddle; the second shredding component 35 adopts the design of a crusher. Compared with the first shredding component 31, the second shredding component 35 further shreds the material, and its shredding degree is greater than that of the first shredding component 31.

[0073] like Fig.12As shown, the friction washing device includes a first friction washing component 61 and a second friction washing component 62. The crushed material first enters the friction cavity of the first friction washing component 61. A plurality of rotatable blades or brushes are arranged in the friction cavity for contacting the material and applying friction. The blades can be arranged in sequence and rotate in the opposite direction, or set at different angles to ensure comprehensive friction cleaning of the material to remove waste materials attached to the surface of the waste film. The first friction washing component 61 and the second friction washing component 62 have the same structure. The discharge port of the first friction washing component 61 is connected to the feed port of the second friction washing component 62. The material after the first step of friction washing enters the friction cavity of the second friction washing component 62 for deeper cleaning.

[0074] like Fig.13 As shown, the screening device also includes a third screening component 13, which includes a third air blowing component 131, a separation cylinder 132, a vibrating screen 133, a fourth air blowing component 134 and a fifth air blowing component 135. The feed port of the third air blowing component 131 is connected to the discharge port of the second friction washing component 62, and its discharge port is connected to the separation cylinder 132. A plurality of separation holes are provided on the wall surface of the separation cylinder 132. The first feed port of the fourth air blowing component 134 is connected to the separation cylinder 132, and the vibrating screen 133 is arranged at the discharge port of the separation cylinder 132; the third air blowing component 131 forms air supply to the separation cylinder 132, and the fourth air blowing component 134 forms air exhaust to the separation cylinder 132, and materials smaller than the separation holes are extracted from the separation cylinder 132 The material is separated and falls onto the vibrating screen 133 under the action of gravity, and the vibrating screen 133 further screens the material thereon, the second feed port of the fourth wind blowing component 134 is connected with the discharge end of the vibrating screen 133, and the light material is extracted from the top, and the heavier material is left below, the third feed port of the fourth wind blowing component 134 is connected with the discharge channel extending from the vibrating screen 133, and the light material in the discharge channel is extracted again, the feed port of the fifth wind blowing component 135 is also connected with the discharge channel, after the fourth wind blowing component 134, the fifth wind blowing component 135 extracts the light material in the discharge channel again, the light materials extracted by the fourth wind blowing component 134 and the fifth wind blowing component 135 are stored in the silo to obtain the required ground film.

[0075] It is conceivable that, in one example, Fig.12 As shown, the above-mentioned cyclone separator structure is additionally provided between the second shredding assembly 35 and the first friction washing assembly 61. Specifically, the feed inlet of the cyclone separator is connected with the discharge outlet of the third wind blowing assembly 131, the third wind blowing assembly 131 delivers the material into the cyclone separator, and the discharge outlet of the cyclone separator is connected with the feed inlet of the first friction washing assembly 61.

[0076] like Fig.14As shown, the discharging device also includes a third dust removal component 26 and a third conveying component 27. The third dust removal component 26 is used to absorb dust generated during the friction washing and the second screening process. The third dust removal component 26 includes a sixth pipeline 261, a sixth dust collector 262, a sixth dust removal belt, a seventh pipeline 264, a seventh dust collector 265 and a seventh dust removal belt. Specifically, one end of the sixth pipeline 261 is connected to the opening ends of the tops of the first friction washing component 61 and the second friction washing component 62, respectively, and the other end thereof is connected to the sixth dust collector 262. The sixth dust removal belt is connected to the sixth dust collector 26 2, the seventh pipeline 264 is connected to the open end at the top of the third screening component 13, and the other end thereof is connected to the seventh dust collector 265, and the seventh dust removal belt is connected to the discharge end of the seventh dust collector 265; the third conveying component 27 includes a ninth slag discharge belt 271 and a tenth slag discharge belt 272, the ninth slag discharge belt 271 is connected to the discharge end of the first friction washing component 61, and receives the waste separated by the first friction washing component 61, and the tenth slag discharge belt 272 is connected to the discharge end of the second friction washing component 62, and receives the waste separated by the second friction washing component 62.

[0077] It is conceivable that the third dust removal assembly 26 may adopt the above-mentioned cyclone separator structure.

[0078] It is understandable that in the mechanical friction washing separation process, Fig.12 As shown, the feeding device further includes a sixth feeding component 76 and a sixth air blowing component 77. Specifically, the feeding port of the sixth feeding component 76 is connected to the discharging port of the unpacking component 33, the second feeding component 34 is arranged on the sixth feeding component 76, the discharging port of the sixth feeding component 76 is connected to the feeding port of the second shredding component 35, the unpacking component 33 puts the unpacked material onto the sixth feeding component 76, the material passes through the second feeding component 34 during the conveying process along the sixth feeding component 76, and the second feeding component 34 quantitatively feeds the material into the second shredding component 35; the air outlet of the sixth air blowing component 77 is connected to the discharging port of the second shredding component 35, and the sixth air blowing component 77 blows the material outputted from the second shredding component 35 into the friction washing device.

[0079] In another example, Fig.12 As shown, the feeding device also includes a heater assembly 78, which is arranged at the air outlet of the sixth wind blowing assembly 77 and is used to heat the airflow output by the sixth wind blowing assembly 77. The hot airflow acts on the material output by the second shredding assembly 35, which can dry and loosen the waste film.

[0080] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0081] Description of reference numerals: first screening component 11, second screening component 12, third screening component 13, third air blowing component 131, separation cylinder 132, vibrating screen 133, fourth air blowing component 134, fifth air blowing component 135, first dust removal component 21, first conveying component 22, second dust removal component 23, second conveying component 24, check component 25, third dust removal component 26, third conveying component 27, first pipeline 211, first dust collector 212, first dust removal belt 21 3. The second pipeline 214, the second dust collector 215, the second dust removal belt 216, the first slag removal belt 221, the second slag removal belt 222, the third slag removal belt 223, the fourth slag removal belt 224, the third pipeline 231, the third dust collector 232, the third dust removal belt 233, the fourth pipeline 234, the fourth dust collector 235, the fourth dust removal belt 236, the fifth pipeline 237, the fifth dust collector 238, the fifth dust removal belt 239, the fifth slag removal belt 241, the sixth slag removal belt belt 242, seventh slag discharge belt 243, eighth slag discharge belt 244, sixth pipeline 261, sixth dust collector 262, seventh pipeline 264, seventh dust collector 265, ninth slag discharge belt 271, tenth slag discharge belt 272, first branch 01, cyclone bucket 02, second branch 03, dust removal fan 04, dust collector 05 and dust removal belt 06, first shredding component 31, first feeding component 32, unpacking component 33, second feeding component 34, second shredding component 35, Dispersion device 1, third box body 51, fourth box body 52, first wind blowing component 53, second wind blowing component 54, first filter screen 511, first cleaning device 512, second filter screen 521, second cleaning device 522, first friction washing component 61, second friction washing component 62, first feeding component 71, second feeding component 72, third feeding component 73, fourth feeding component 74, fifth feeding component 75, sixth feeding component 76, sixth wind blowing component 77, heater component 78.

Claims

1. A multi-stage separation and recovery method for ground film, characterized in that: include: Performing a first screening of a portion of waste materials on the material and performing a first discharge of the portion of waste materials separated in the first screening process; Performing a first crushing and breaking up of the material after the first discharge, separating the material and a portion of waste material by blowing, and performing a second discharge of a portion of waste material separated during the blowing process; as well as The second discharged material is subjected to a second crushing and friction washing, and a portion of the waste material is subjected to a second screening of the friction washed material to obtain a ground film separated from the waste material.

2. The method according to claim 1, characterized in that The first screening comprises: Performing a first step screening and a second step screening of a portion of the waste material on the material; Wherein, during the first step of screening, the waste material smaller than the first preset size is screened, and the screened material is subjected to the second step of screening; During the second screening step, waste materials smaller than a second preset size are screened.

3. The method according to claim 2, characterized in that The first discharge comprises: Performing a first step discharge and a second step discharge on a portion of the waste separated in the first screening process; Wherein, during the first step of discharge, the waste separated in the first step of screening is sucked out and the belt is used for slag removal; During the second step of discharge, the waste separated in the second step of screening is sucked out and the slag is discharged by belt.

4. The method according to claim 1, characterized in that: Blowing assistance includes: Carry out the first step and the second step of blowing on a part of the waste after the materials are dispersed; Wherein, during the first step of blowing, the blowing is used to transport the material in one direction, and a part of the waste material is separated during the transportation process; During the second step of assisting blowing, the separated material and a part of the waste material are transported in reverse direction, and the material and the waste material are stored separately.

5. The method according to claim 4, characterized in that The second discharge includes: Performing a third step discharge and a fourth step discharge on a portion of the waste separated during the blowing process; Wherein, during the third step of discharge, the waste separated in the first step of blowing process is sucked out and the slag is discharged by belt; During the fourth step of discharge, the waste separated in the second step of blowing is sucked out and the slag is discharged from the belt.

6. The method according to claim 1, characterized in that Friction washing includes: The crushed material is subjected to a first step of friction washing and a second step of friction washing; Wherein, in the first step of friction washing, the crushed material is friction washed; During the second friction washing, the material after the first friction washing is friction washed.

7. A multi-stage separation and recovery system for ground film, characterized in that: include: A screening device, the screening device is used to perform a first screening and a second screening of a portion of waste materials on the material; A discharge device, the discharge device is connected to the screening device, and is used for first discharging a portion of the waste separated in the first screening process and second discharging a portion of the waste separated in the blowing separation process; A shredding device, the shredding device is used to perform a first shredding on the first discharged material and a second shredding on the second discharged material; A dispersing device, the dispersing device is used to disperse the material after the first shredding; A wind chamber, the wind chamber is used to separate the material and a part of the waste material by using auxiliary blowing; as well as A friction washing device is used to friction wash the second crushed material.

8. The system according to claim 7, characterized in that The screening device comprises: A first screening component, the first screening component is used to perform a first step of screening of waste materials smaller than a first preset size; a second screening assembly, the second screening assembly being used for performing a second step of screening the material for waste materials smaller than a second preset size; The discharging device comprises: a first dust removal component, the first dust removal component is connected to the first screening component and the second screening component respectively, and is used to absorb a portion of waste separated in the first screening process; The first conveying component is connected to the first screening component and the second screening component respectively, and is used to discharge a part of the waste separated in the first screening process.

9. The system according to claim 7, characterized in that The wind chamber comprises: a first airflow region and a second airflow region; a first air blowing component, the first air blowing component is used to provide an air flow for separating materials and waste materials in the first air flow area; a second air blowing component, the second air blowing component being used to provide an air flow for separating materials and waste materials in the second air flow area; The discharging device also includes: A second dust removal component, the second dust removal component is connected to the first airflow area and the second airflow area respectively, and is used to absorb a portion of waste separated during the blowing process; The second conveying component is connected to the first airflow area and the second airflow area respectively, and is used for discharging a part of the waste separated during the blowing process.

10. The system according to claim 7, characterized in that The friction washing device comprises: a first friction washing component, the first friction washing component is used to perform a first step of friction washing on the second crushed material; a second friction washing component, the second friction washing component is used to perform a second friction washing on the material after the first friction washing; The third screening component is used for performing a second screening of waste materials on the material after friction washing.

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