Household garbage sorting method and household garbage sorting system

Abstract

The invention relates to the technical field of garbage sorting, and discloses a household garbage sorting method and a household garbage sorting system. The household garbage sorting method comprises the following steps: carrying out bag breaking, scattering and screening treatment on household garbage to remove granular garbage; the household garbage is dispersed and conveyed to a first conveying belt, and iron-containing garbage is removed; a first image recognition module is used for recognizing the recoverable garbage with the regular appearance on the first conveying belt, and a plurality of first mechanical arms are used for sorting the recognized recoverable garbage; the household garbage is conveyed to a second conveying belt, and the second conveying belt is heated, so that the plastic garbage is thermally deformed; and the plastic garbage subjected to thermal deformation on the second conveying belt is recognized through a second image recognition module, and meanwhile the recognized plastic garbage subjected to thermal deformation is sorted through a plurality of second mechanical arms. The device is good in recognition effect and high in separation efficiency, plastic products with complete shapes can be sorted out, and the device has a good separation effect on plastic garbage with damaged shapes.

Description

Technical Field

[0001] The present invention relates to the technical field of waste sorting, and in particular to a method and system for sorting domestic waste. Background Art

[0002] Domestic waste refers to solid waste generated in people's daily lives or in activities that provide services for daily life, as well as solid waste that is deemed as domestic waste by laws and administrative regulations. It mainly includes residents' domestic waste, market trade and commercial waste, public place waste, street cleaning waste and waste from enterprises and institutions.

[0003] Domestic waste treatment has shifted from "incineration" to "resource utilization", the latter of which has the advantages of reducing carbon emissions, reducing treatment subsidies, and reducing pollution emissions. At present, attention has been paid to low-value recyclables. However, the classification of recyclables at the resident end is not very effective, and it mainly depends on "scavengers" to manually sort out some of the higher-value components. The working environment is poor and the sorting speed is slow. When using machine sorting, the recognition of deformed and severely damaged plastic domestic waste is poor, resulting in low sorting efficiency. Summary of the invention

[0004] The purpose of the embodiments of the present invention is to provide a method for sorting domestic waste and a domestic waste sorting system for implementing the domestic waste sorting method. The domestic waste sorting method of the present invention has good recognition effect and high separation efficiency. In addition to being able to sort out plastic products with complete shapes, it also has a good separation effect on plastic waste with damaged shapes.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A method for sorting domestic waste is provided, comprising the following steps:

[0007] S10, breaking bags, breaking up and screening domestic waste to remove granular waste;

[0008] S20, dispersing and treating the domestic waste after removing the granular waste, and then transferring it to the first conveyor belt to remove the iron-containing waste;

[0009] S30, using the first image recognition module to identify recyclable garbage with regular shapes on the first conveyor belt, and using a plurality of first robotic arms to sort out the identified recyclable garbage;

[0010] S40, continue to convey the domestic waste to the second conveyor belt, heat the second conveyor belt to thermally deform the plastic waste; use the second image recognition module to identify the plastic waste that has thermally deformed on the second conveyor belt, and use a plurality of second robotic arms to sort out the identified plastic waste that has thermally deformed.

[0011] As a further solution of the domestic waste sorting method, the heating temperature of the second conveyor belt is 70°C-90°C.

[0012] As a further solution of the domestic waste sorting method, the domestic waste is cooled respectively before and after the heating zone of the second conveyor belt along the conveying direction of the second conveyor belt.

[0013] As a further solution of the domestic waste sorting method, the heating treatment of the second conveyor belt specifically refers to: heating the second conveyor belt so that the second conveyor belt has three heating zones set at intervals, and along the conveying direction of the second conveyor belt, the temperatures of the three heating zones are 70℃-90℃, 90℃-125℃, and 125℃-150℃ respectively, and each heating zone corresponds to a number of second robotic arms.

[0014] As a further solution of the domestic waste sorting method, along the conveying direction of the second conveyor belt, the temperatures of the three heating zones are 80° C., 120° C., and 140° C. respectively.

[0015] As a further solution of the domestic waste sorting method, the domestic waste is cooled before and after each heating zone along the conveying direction of the second conveyor belt.

[0016] On the other hand, a domestic waste sorting system is provided for implementing the domestic waste sorting method, comprising a drum, a first vibrating feeder, a first conveyor belt, a second vibrating feeder and a second conveyor belt arranged in sequence along the domestic waste conveying direction, and also comprising an iron removal mechanism, a first image recognition module, a plurality of first mechanical arms, a heating mechanism, a second image recognition module and a plurality of second mechanical arms;

[0017] The drum is used to break bags of domestic waste, scatter and screen to remove granular waste, and transfer the domestic waste with granular waste removed to the first vibrating feeder; the first vibrating feeder is used to disperse the domestic waste with granular waste removed and transfer it to the first conveyor belt; the iron removal mechanism is arranged on the first conveyor belt, and is used to sort out the iron-containing waste on the first conveyor belt; the first image recognition module and the first mechanical arm are arranged adjacent to the first conveyor belt, the first image recognition module is used to identify the recyclable waste with regular shape on the first conveyor belt, and the first mechanical arm is used to sort out the recyclable waste with regular shape that has been identified; the second vibrating feeder is used to disperse the recyclable waste with iron-containing waste and regular shape and transfer it to the second conveyor belt; the heating mechanism is arranged adjacent to the lower surface of the second conveyor belt located above, and is used to heat the second conveyor belt to make the plastic waste on the second conveyor belt deformed by heat; the second image recognition module and the second mechanical arm are arranged adjacent to the second conveyor belt, the second image recognition module is used to identify the plastic waste deformed by heat on the second conveyor belt, and the second mechanical arm is used to sort out the plastic waste deformed by heat that has been identified.

[0018] As a further scheme of the domestic waste sorting system, it also includes a first cooling mechanism and a second cooling mechanism, the first cooling mechanism and the second cooling mechanism are adjacent to the lower surface of the second conveyor belt located above, and the first cooling mechanism, the heating mechanism and the second cooling mechanism are arranged in sequence along the conveying direction of the second conveyor belt.

[0019] As a further solution of the domestic waste sorting system, the heating mechanism includes three heating parts which are arranged in sequence and at intervals along the conveying direction of the second conveyor belt, and the heating temperatures of the three heating parts are increased in sequence.

[0020] As a further solution of the domestic waste sorting system, it also includes multiple cooling mechanisms, which are adjacent to the lower surface of the second conveyor belt located above, and a cooling mechanism is respectively arranged in front and behind each heating part.

[0021] Beneficial effects:

[0022] For recyclable garbage with regular shapes, including plastic bottles and cartons with regular shapes, the present invention can effectively identify them using the first image recognition module and sort them out through the first robotic arm. For other plastic bottles or other plastic products that are severely damaged and deformed, it is difficult for the first image recognition module to identify them. The present invention heats the second conveyor belt so that the plastic garbage on the second conveyor belt is deformed by heat. After the second image recognition module recognizes the deformation movement of the plastic product, it triggers the sorting action of the second robotic arm, thereby sorting out the plastic products that have undergone thermal deformation. Compared with the prior art, the domestic waste sorting method of the present invention has a good recognition effect on plastic products and a high separation efficiency. In addition to being able to sort out plastic products with complete shapes, it also has a good separation effect on plastic garbage with damaged shapes. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention is further described in detail below based on the accompanying drawings and embodiments.

[0024] Figure 1 This is a schematic diagram of a domestic waste sorting system according to Embodiment 1 of the present invention.

[0025] Figure 2 This is a schematic diagram of the installation of the heating mechanism and the cooling mechanism described in Example 1 of the present invention on the second conveyor belt.

[0026] Figure 3 This is a schematic diagram of the installation of the heating mechanism and the cooling mechanism described in the second embodiment of the present invention on the second conveyor belt. DETAILED DESCRIPTION

[0027] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] In the description of this embodiment, if the terms "upper", "lower", "left", "right" and other directions or positional relationships appear, they are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, if the terms "first", "second", etc. appear, they are only used to distinguish in the description and have no special meaning.

[0031] Embodiment 1

[0032] like Figure 1 As shown, the method for sorting domestic waste in this embodiment includes the following steps:

[0033] S10, breaking bags, breaking up and screening domestic waste to remove granular waste;

[0034] S20, dispersing and treating the domestic waste after removing the granular waste, and then transferring it to the first conveyor belt to remove the iron-containing waste;

[0035] S30, using the first image recognition module to identify recyclable garbage with regular shapes on the first conveyor belt, and using a plurality of first robotic arms to sort out the identified recyclable garbage;

[0036] S40, continue to convey the domestic waste to the second conveyor belt, heat the second conveyor belt to thermally deform the plastic waste; use the second image recognition module to identify the plastic waste that has thermally deformed on the second conveyor belt, and use a plurality of second robotic arms to sort out the identified plastic waste that has thermally deformed.

[0037] The method for sorting domestic waste in this embodiment mainly sorts out plastic products (including fabrics with some of the same chemical components, such as polyester, etc.) from dry waste. Plastic products have high calorific value and can be used separately after sorting, such as recycling as raw materials, or heating and decomposing gas, pyrolysis oil, etc. Compared with direct incineration, carbon emissions and pollutant emissions are significantly reduced.

[0038] In this embodiment, recyclable garbage with regular shapes includes plastic bottles and cartons with regular shapes, which can be effectively identified by the first image recognition module and sorted out by the first robotic arm. However, there are also some plastic bottles or other plastic products in the domestic garbage that are severely damaged and deformed, which are difficult to identify by the first image recognition module. Therefore, in this embodiment, a second conveyor belt is arranged downstream of the first conveyor belt, and the second conveyor belt is heated so that the plastic products in the domestic garbage on the second conveyor belt are deformed after being heated, that is, compared with other garbage, a more obvious deformation movement will occur, with obvious characteristics and easy to identify. After the second image recognition module recognizes the deformation movement of the plastic product, it triggers the sorting action of the second robotic arm to sort out the plastic product that has undergone thermal deformation.

[0039] The embodiment of the present invention uses the heating deformation of plastic waste to allow the second image recognition module to recognize it, which can significantly improve the recognition reliability compared to relying solely on visual recognition.

[0040] Compared with the prior art, the domestic waste sorting method of this embodiment has a good recognition effect on plastic products and a high separation efficiency. In addition to being able to sort out plastic products with complete shapes, it also has a good separation effect on plastic waste with damaged shapes.

[0041] Furthermore, the heating temperature of the second conveyor belt is 70°C-90°C. By designing the heating temperature of the second conveyor belt to be 70°C-90°C, the plastic waste can be thermally deformed, and the thermal deformation movement of the plastic waste can be recognized by the second image recognition module.

[0042] Furthermore, in step S40, the domestic waste is cooled down before and after the heating zone of the second conveyor belt along the conveying direction of the second conveyor belt. Since the second conveyor belt is made of heat-conducting material, cooling down the domestic waste before and after the heating zone can prevent heat from being transported along the second conveyor belt, prevent plastic waste from being deformed by heat before entering the heating zone and undergoing thermal deformation identification, and prevent plastic waste from continuing to melt by heat after leaving the heating zone. At the same time, heat can be recovered through cooling.

[0043] In step S40, after the identified heat-deformed plastic waste is sorted out by a plurality of second robotic arms, the remaining waste is conveyed to the next station via a second conveyor belt for temporary storage or direct processing.

[0044] This embodiment also provides a household waste sorting system, which is used to implement the household waste sorting method described in the above embodiment. Figure 1As shown, the domestic waste sorting system of this embodiment includes a drum, a first vibrating feeder, a first conveyor belt, a second vibrating feeder and a second conveyor belt arranged in sequence along the domestic waste conveying direction, and also includes an iron removal mechanism, a first image recognition module, a plurality of first mechanical arms, a heating mechanism, a second image recognition module and a plurality of second mechanical arms;

[0045] The drum is used to break bags of domestic waste, scatter and screen to remove granular waste, and transfer the domestic waste with granular waste removed to the first vibrating feeder; the first vibrating feeder is used to disperse the domestic waste with granular waste removed and transfer it to the first conveyor belt; the iron removal mechanism is arranged on the first conveyor belt, and is used to sort out the iron-containing waste on the first conveyor belt; the first image recognition module and the first mechanical arm are arranged adjacent to the first conveyor belt, the first image recognition module is used to identify the recyclable waste with regular shape on the first conveyor belt, and the first mechanical arm is used to sort out the recyclable waste with regular shape that has been identified; the second vibrating feeder is used to disperse the recyclable waste with iron-containing waste and regular shape and transfer it to the second conveyor belt; the heating mechanism is arranged adjacent to the lower surface of the second conveyor belt located above, and is used to heat the second conveyor belt to make the plastic waste on the second conveyor belt deformed by heat; the second image recognition module and the second mechanical arm are arranged adjacent to the second conveyor belt, the second image recognition module is used to identify the plastic waste deformed by heat on the second conveyor belt, and the second mechanical arm is used to sort out the plastic waste deformed by heat that has been identified.

[0046] In this embodiment, the dry garbage that has been filtered and dehumidified is first stored in the receiving bin, and the domestic garbage in the receiving bin is transported to the drum through the conveying device. The drum is provided with a blade and a screen, and the bagged garbage can be broken by the blade, and various types of domestic garbage can be scattered, which is helpful for subsequent flattening on the first conveyor belt; heavier small particles such as broken glass, stones and bones can be partially removed by screening. The structure of the drum is conventional technology in this field and will not be described in detail.

[0047] The first vibrating feeder and the second vibrating feeder are respectively used to further disperse the materials. By controlling the feeding speed and the transmission speed of the corresponding transmission belt, a discrete material distribution can be formed on the downstream conveyor belt, which is convenient for subsequent identification. The first vibrating feeder and the second vibrating feeder are both conventional technologies in the field, and the specific details are not repeated.

[0048] The structure and installation position of the iron removal mechanism on the first conveyor belt are conventional technical means in the field. For example, the iron removal mechanism can adopt a conventional magnetic sorting device, which will not be described in detail. The first conveyor belt and the second conveyor belt can meet the requirements of material discreteness and flat transmission and be resistant to garbage corrosion. The operating temperature of the first conveyor belt is room temperature. The first image recognition module and the second image recognition module as well as the first robotic arm and the second robotic arm are also conventional technical means in the field.

[0049] For example, Figure 2 As shown, the heating mechanism 10 includes a cylindrical electric heating rod 101 and a bearing 102 sleeved on the outer circumference of the electric heating rod 101, the second conveyor belt 20 includes a belt body 201 and a pulley 202, the electric heating rod 101 is arranged between the two pulleys 202 of the second conveyor belt 20 and between the upper belt body and the lower belt body of the second conveyor belt 20, when the second conveyor belt 20 is working, the bearing 102 is in rolling contact with the lower surface of the upper belt body of the second conveyor belt 20, and the electric heating rod 101 is heated. The heat is transferred to the second conveyor belt 20 through the bearing 102, so that the domestic waste on the second conveyor belt 20 is heated.

[0050] Furthermore, the domestic waste sorting system of the present embodiment includes a first cooling mechanism 30 and a second cooling mechanism 40, the first cooling mechanism 30 and the second cooling mechanism 40 are adjacent to the lower surface of the second conveyor belt 20 located above, and the first cooling mechanism 30, the heating mechanism 10 and the second cooling mechanism 40 are arranged in sequence along the conveying direction of the second conveyor belt 20.

[0051] Specifically, the first cooling mechanism 30 and the second cooling mechanism 40 may be cooling plates disposed between the upper and lower belt bodies of the second conveyor belt 20, and adjacent to the lower surface of the upper belt body of the second conveyor belt 20, that is, adjacent to the lower surface of the second conveyor belt 20 located above. The cooling plate has a cavity in which a cooling liquid is disposed, and the cooling plate contacts the lower surface of the upper belt body to cool the upper belt body and the domestic waste on the upper belt body so that the domestic waste is close to room temperature.

[0052] This embodiment can prevent the domestic waste from being heated and deformed in advance and unable to be identified by respectively arranging the first cooling mechanism 30 and the second cooling mechanism 40 before and after the heating mechanism 10. At the same time, heat recovery can be achieved based on the first cooling mechanism 30 and the second cooling mechanism 40.

[0053] In this embodiment, the second conveyor belt 20 can be designed to meet the requirements of discrete and flat transmission of materials, be resistant to garbage corrosion, have good thermal conductivity, and be heat-resistant to 200°C.

[0054] This embodiment also includes a container (not shown in the figure), and the entire domestic waste sorting system is installed in the container to facilitate ventilation and control odor.

[0055] Embodiment 2

[0056] The method for sorting domestic waste in this embodiment is basically the same as that in the first embodiment described above, except for the specific method of heating the second conveyor belt.

[0057] In this embodiment, the heating treatment of the second conveyor belt specifically refers to: heating the second conveyor belt so that the second conveyor belt has three heating zones, and along the conveying direction of the second conveyor belt, the temperatures of the three heating zones are 70°C-90°C, 90°C-125°C, and 125°C-150°C respectively. Since the thermal deformation temperatures of different types of plastics are inconsistent, this embodiment can further classify and sort plastic waste by setting multiple heating zones.

[0058] Preferably, along the conveying direction of the second conveyor belt, the temperatures of the three heating zones are 80° C., 120° C., and 140° C. respectively.

[0059] The domestic waste sorting system of this embodiment is basically the same as the above-mentioned embodiment 1, and the difference lies in the structure and layout of the heating mechanism and the corresponding mechanical sorting mechanism.

[0060] Specifically, Figure 3 As shown, the heating mechanism 10 of this embodiment includes a first heating unit 11, a second heating unit 12 and a third heating unit 13 arranged in sequence along the conveying direction of the second conveyor belt 20, and the heating temperatures of the first heating unit 11, the second heating unit 12 and the third heating unit 13 are increased in sequence. At the same time, the second robotic arm is also divided into 3 groups, corresponding to the three heating units, and the plastic waste is sorted out after it is deformed and recognized by the second image recognition module to prevent it from entering the next heating unit. Among them, the three heating units correspond to the three heating zones one by one.

[0061] The first heating unit 11 , the second heating unit 12 and the third heating unit 13 have the same structures as the heating mechanism 10 of the first embodiment, and will not be described in detail.

[0062] Correspondingly, the domestic waste sorting system of this embodiment further includes a plurality of cooling mechanisms, each of which is adjacent to the lower surface of the second conveyor belt 20 located above, and a cooling mechanism is provided in front of and behind each heating part, respectively.

[0063] Specifically, Figure 3 As shown, there are four cooling mechanisms, namely a first cooling mechanism 30, a second cooling mechanism 40, a third cooling mechanism 50 and a fourth cooling mechanism 60. The first cooling mechanism 30, the first heating unit 11, the second cooling mechanism 40, the second heating unit 12, the third cooling mechanism 50, the third heating unit 13 and the fourth cooling mechanism 60 are arranged at intervals along the conveying direction of the second conveyor belt 20.

[0064] In other embodiments, the three heating parts can be selectively turned on according to the actual deformation temperature of the plastic waste. Correspondingly, only the cooling mechanisms before and after the corresponding heating parts can be turned on. The details are not repeated here.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A method for sorting domestic waste, characterized in that: The following steps are involved: S10, breaking bags, breaking up and screening domestic waste to remove granular waste; S20, dispersing and treating the domestic waste after removing the granular waste, and then transferring it to the first conveyor belt to remove the iron-containing waste; S30, using the first image recognition module to identify recyclable garbage with regular shapes on the first conveyor belt, and using a plurality of first robotic arms to sort out the identified recyclable garbage; S40, continue to convey the domestic waste to the second conveyor belt, heat the second conveyor belt, and thermally deform the plastic waste; The second image recognition module is used to identify the plastic waste that has been thermally deformed on the second conveyor belt, and a plurality of second robotic arms are used to sort out the identified plastic waste that has been thermally deformed.

2. The method for sorting domestic waste according to claim 1, characterized in that: The second conveyor belt heating temperature is 70°C-90°C.

3. The method for sorting domestic waste according to claim 2, characterized in that: In step S40, the domestic waste is cooled down along the conveying direction of the second conveyor belt and before and after the heating zone of the second conveyor belt.

4. The method for sorting domestic waste according to claim 1, characterized in that: The heating treatment of the second conveyor belt specifically refers to: heating the second conveyor belt so that the second conveyor belt has three heating zones set at intervals. Along the conveying direction of the second conveyor belt, the temperatures of the three heating zones are 70℃-90℃, 90℃-125℃, and 125℃-150℃ respectively, and each heating zone corresponds to a number of second robotic arms.

5. The method for sorting domestic waste according to claim 4, characterized in that: Along the conveying direction of the second conveyor belt, the domestic waste is cooled before and after each heating zone.

6. A domestic waste sorting system, used to implement the domestic waste sorting method according to any one of claims 1 to 5, characterized in that: It includes a drum, a first vibrating feeder, a first conveyor belt, a second vibrating feeder and a second conveyor belt which are sequentially arranged along the conveying direction of domestic waste, and also includes an iron removal mechanism, a first image recognition module, a plurality of first mechanical arms, a heating mechanism, a second image recognition module and a plurality of second mechanical arms; The drum is used to break bags of domestic waste, scatter and screen to remove granular waste, and transfer the domestic waste with granular waste removed to the first vibrating feeder; the first vibrating feeder is used to disperse the domestic waste with granular waste removed and transfer it to the first conveyor belt; the iron removal mechanism is arranged on the first conveyor belt, and is used to sort out the iron-containing waste on the first conveyor belt; the first image recognition module and the first mechanical arm are arranged adjacent to the first conveyor belt, the first image recognition module is used to identify the recyclable waste with regular shape on the first conveyor belt, and the first mechanical arm is used to sort out the recyclable waste with regular shape that has been identified; the second vibrating feeder is used to disperse the recyclable waste with iron-containing waste and regular shape and transfer it to the second conveyor belt; the heating mechanism is arranged adjacent to the lower surface of the second conveyor belt located above, and is used to heat the second conveyor belt to make the plastic waste on the second conveyor belt deformed by heat; the second image recognition module and the second mechanical arm are arranged adjacent to the second conveyor belt, the second image recognition module is used to identify the plastic waste deformed by heat on the second conveyor belt, and the second mechanical arm is used to sort out the plastic waste deformed by heat that has been identified.

7. The domestic waste sorting system according to claim 6, characterized in that: It also includes a first cooling mechanism and a second cooling mechanism, wherein the first cooling mechanism and the second cooling mechanism are adjacent to the lower surface of the second conveyor belt located above, and the first cooling mechanism, the heating mechanism and the second cooling mechanism are arranged in sequence along the conveying direction of the second conveyor belt.

8. The domestic waste sorting system according to claim 6, characterized in that: The heating mechanism includes three heating parts which are sequentially arranged at intervals along the conveying direction of the second conveyor belt, and the heating temperatures of the three heating parts are increased sequentially.

9. The domestic waste sorting system according to claim 8, characterized in that: It also includes a plurality of cooling mechanisms, which are adjacent to the lower surface of the second conveyor belt located above, and a cooling mechanism is respectively arranged in front of and behind each heating part.

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