Multi-stage screening visual selector

Abstract

The invention discloses a multi-stage screening visual selector which comprises a conveying platform, the conveying platform comprises a platform body, a conveying roller and a conveying component, the conveying component is used for conveying materials forwards, and the conveying component comprises a flexible component and a plurality of bearing components; the multiple bearing components are arranged in the extending direction of the flexible component and attached to the outer side of the flexible component. The areas, located on the two sides of the flexible component, of the bearing component are each provided with a positioning structure, and the positioning structures are used for bearing materials and limiting the materials from moving relative to the bearing component. The visual identification system is used for collecting image information of the materials on the bearing component and dividing the materials into different grades based on the image information; the removing mechanism is used for removing the materials divided into different grades from the bearing part of the conveying part; and the material receiving mechanism is used for guiding and storing the different grades of materials removed from the conveying component.

Description

Technical Field

[0001] The invention relates to the technical field of screening and sieving, and in particular to a multi-stage screening and selection machine. Background Art

[0002] The screening visual selection machine for screening materials (such as nuts, fruits, etc.) in the prior art generally includes: a conveying platform, a visual recognition system and a rejection mechanism; the conveying platform includes a conveyor belt for conveying materials and a conveyor roller supporting and driving the conveyor belt, the visual recognition system is used to collect image information of the material on the conveyor belt and determine whether screening is required based on the screening rules (procedures), and the rejection mechanism is used to change the conveying trajectory of the material based on the result of the need for screening determined by the visual recognition system, thereby realizing the separation of the material from other materials, and the separated material is received by the material receiving mechanism, thereby realizing the screening of the material. In the prior art, in order to realize multi-level screening, the visual recognition system classifies the material into grades based on the image information (the grade classification includes but is not limited to: size grade, surface quality grade, shape grade), and materials of different grades are screened by the rejection mechanism and received by the corresponding material receiving mechanism.

[0003] However, the conveyor belt of the conveying platform in the prior art, when used in the visual selection machine, has at least the following effects on the positioning and identification of materials: the material may move relative to the conveyor belt (such as rolling, translation), especially unstable round, quasi-circular, and irregular-shaped materials. This will not only result in inaccurate positioning of the material, but also may cause blurred images captured by the visual recognition system (if the camera in the recognition system shoots the material in relative motion, the captured image may be blurred). Summary of the invention

[0004] In view of the above problems existing in the prior art, an object of the present invention is to provide a multi-stage screening machine to solve the problems in the prior art.

[0005] In order to achieve the above object, the present invention adopts the following scheme.

[0006] A multi-stage screening machine, comprising:

[0007] A conveying platform comprises a platform body, conveying rollers installed on the front and rear sides of the platform body, and at least one set of conveying components driven by the conveying rollers, wherein the conveying components are used to convey materials forward, and the conveying components comprise: a flexible component and a plurality of supporting components; the plurality of supporting components are arranged along the extension direction of the flexible component and attached to the outer side of the flexible component; the areas of the supporting components located on both sides of the flexible component are both provided with positioning structures, the positioning structures are used to receive materials and limit the movement of materials relative to the supporting components, so that during the process of the conveying components conveying materials, the materials are stably located on the supporting components; the supporting components can adopt a variety of structural forms, including but not limited to the supporting components being configured into strips, discs or shapes profiling the local contour of the material extending perpendicular to the conveying direction, wherein the supporting parts of the materials include but are not limited to planes, curved surfaces or shaped surfaces profiling the local contour of the material.

[0008] A visual recognition system, which is used to collect image information of the material on the supporting member and classify the material into different grades based on the image information;

[0009] A rejecting mechanism, which is used to reject materials classified into different grades from the supporting component of the conveying component;

[0010] The material receiving mechanism is used to guide and receive materials of different grades removed from the conveying components.

[0011] Preferably, the flexible component comprises a flexible belt body, a plurality of protrusions are formed on the outer surface of the flexible belt body, a slot is configured at the bottom of the supporting component, and the protrusions are inserted into the slot so that the supporting component is attached to the flexible belt body.

[0012] Preferably, the positioning structure comprises a positioning groove, which extends perpendicularly to the conveying direction and passes through the end of the supporting component.

[0013] Preferably, a convex rib is configured at a position of the supporting component corresponding to the slot, and the slot extends to the inside of the convex rib; wherein:

[0014] The convex rib is higher than the bottom of the positioning groove.

[0015] Preferably, the supporting member is configured to be transparent. The supporting member can adopt various structural forms, including but not limited to the supporting member configured to be in a strip, disc or shape profiling the local contour of the material extending perpendicular to the conveying direction, wherein the supporting part of the material includes but is not limited to a plane, a curved surface or a shaped surface profiling the local contour of the material.

[0016] Preferably, the rejection mechanism includes an airflow injection mechanism, and each of the conveying components is equipped with a set of airflow injection mechanisms, the injection mechanism has a plurality of groups of nozzles arranged at intervals along the conveying direction, each group of nozzles includes at least two nozzles, and the at least two nozzles are used to spray airflow on a horizontal reference perpendicular to the conveying direction, and the directions of the airflows sprayed by the two nozzles are opposite so as to respectively spray airflow at the materials in the two supporting areas on the supporting component.

[0017] Preferably, the visual recognition system comprises at least two sets, and the at least two sets of the visual recognition system are respectively arranged above and below the conveying component to collect image information of the material from above and below respectively.

[0018] Preferably, the material receiving mechanism comprises a plurality of material receiving ports and a transverse material guiding mechanism; wherein:

[0019] A plurality of receiving ports are arranged on both sides of the conveying component, and the plurality of receiving ports are arranged along the conveying direction. The receiving ports on each side face the conveying component, and the airflow ejected by the nozzle of the airflow ejection mechanism causes the material to enter the receiving port;

[0020] The transverse material guiding mechanism includes a transverse conveyor belt, which is used to receive the material from the material receiving port and convey the material transversely to the side of the conveying platform.

[0021] Preferably, a plurality of partition slats are arranged above the transverse conveyor belt, and the plurality of partition slats respectively correspond to the plurality of adjacent material receiving ports so as to respectively receive materials from the plurality of material receiving ports.

[0022] Preferably, the conveying components include a plurality of sets, and the plurality of sets of conveying components are arranged at intervals perpendicular to the conveying direction.

[0023] Compared with the prior art, the multi-stage screening machine provided by the present invention has the following advantages:

[0024] 1. By configuring a positioning structure on the supporting component, the material can be stably transported by the conveying component to avoid the material moving relative to the conveying component, which is conducive to the visual recognition system to obtain a clear image of the material, and based on the positioning of the material by the supporting component, it is conducive to the rejection mechanism to accurately reject the material. The conveying component provided by the present invention is particularly suitable for conveying unstable materials, such as round materials, quasi-round materials, and other unstable special-shaped materials. The multi-stage screening visual selection machine provided by the present invention is particularly suitable for screening unstable materials.

[0025] 2. Configure the supporting parts to be transparent to avoid the supporting parts blocking the light, which is conducive to the visual recognition system to shoot the material from different positions and angles.

[0026] 3. In the supporting component in which the positioning structure is configured as a positioning groove, the positioning groove has a better guiding effect on the lateral movement of the material and the airflow, so that the airflow pushes the material to move strictly in the lateral direction and avoids affecting the material on other supporting components.

[0027] 4. Other advantages are directly or implicitly recorded in the specific implementation methods below.

[0028] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention.

[0029] This summary of various implementations or examples of the technology described in this disclosure is not a comprehensive disclosure of the entire scope or all features of the disclosed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In the drawings, which are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with letter suffixes or different letter suffixes may represent different instances of similar parts. The accompanying drawings generally illustrate various embodiments by way of example and not limitation, and together with the specification and claims, are used to illustrate the embodiments of the invention. When appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method.

[0031] Figure 1 A three-dimensional structural view of a multi-stage screening machine provided in an embodiment of the present invention.

[0032] Figure 2 A schematic diagram of the three-dimensional structure of a conveying component in a multi-stage screening machine provided in an embodiment of the present invention.

[0033] Figure 3 A schematic diagram of the three-dimensional structure of the supporting component from one perspective.

[0034] Figure 4 A schematic diagram of the three-dimensional structure of the supporting component from another perspective.

[0035] Figure 5 It is a schematic diagram of the three-dimensional structure of the flexible belt.

[0036] Reference numerals:

[0037] 10-hopper; 20-discharging mechanism; 30-conveying platform; 31-platform body; 32-conveying component; 321-supporting component; 3211-positioning groove; 3212-convex rib; 3213-slot; 322-flexible belt; 3221-positioning strip; 3222-convex body; 41-first visual recognition system; 42-second visual recognition system; 50-air flow injection mechanism; 51-mounting seat; 60-material receiving mechanism; 61-material receiving port; 62-lateral material guiding mechanism; 621-lateral driving roller; 622-lateral conveyor belt; 623-partitioning strip; 624-sloped material guiding channel; 70-storage box. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0040] In order to keep the following description of the embodiments of the present invention clear and concise, detailed descriptions of well-known functions and well-known components are omitted.

[0041] like Figures 1 to 5As shown, an embodiment of the present invention discloses a conveying component 32, a conveying platform 30 including the conveying component 32, and a multi-stage screening visual selection machine including the conveying platform 30, and the multi-stage screening visual selection machine also includes: a discharging mechanism 20, a visual recognition system, a rejection mechanism, and a material receiving mechanism 60. The multi-stage screening visual selection machine disclosed in the present invention can be used to screen materials such as nuts, specifically for example, walnuts, and can also be used to screen materials such as fruits, specifically for example, apples, tomatoes, etc. The multi-stage screening visual selection machine disclosed in the present invention is particularly suitable for screening unstable materials, such as round materials and quasi-round materials, however, it is not limited to these materials. The multi-stage screening visual selection machine disclosed in the present invention can divide materials into multiple levels according to preset rules and screen the divided materials accordingly, for example, the grades are divided according to the size of the outer dimensions of the walnuts, and for another example, the grades are divided according to the surface quality of the walnuts, and the materials of different grades divided are screened and stored separately.

[0042] like Figure 1 As shown, the discharging mechanism 20 is located upstream of the conveying platform 30, that is, located on the rear side of the conveying platform 30. A hopper 10 is installed above the discharging mechanism 20. The hopper 10 contains materials to be screened. The materials in the hopper 10 gradually fall onto the tray of the discharging mechanism 20. The tray of the discharging mechanism 20 has a plurality of guide components arranged at an angle. Under the action of vibration, the material falling on the tray moves forward, and through the dispersing effect of the guide components, the material is discharged from the front end of the tray in multiple columns and falls on the conveying platform 30 in front.

[0043] The conveying platform 30 includes: a platform body 31, conveying rollers 33 and a conveying member 32. The rear side of the platform body 31 is adjacent to the discharging mechanism 20, and conveying rollers 33 are installed on the upper and lower parts of the rear side of the platform body 31 and the upper and lower parts of the front side of the conveying platform 30, and at least one of the conveying rollers 33 is a driving roller, that is, driven to rotate by a motor, for example, the conveying roller 33 on the upper part of the front side of the conveying platform 30 is a driving roller.

[0044] like Figure 2 Combined with Figures 3 to 5As shown, the conveying component 32 includes a flexible component and a plurality of supporting components 321. The flexible component includes but is not limited to the following structural forms: the flexible component is a flexible belt body, the flexible component is a chain (if the flexible component is a chain, a sprocket needs to be installed on the driving roller). The flexible belt body 322 is used as a flexible component for explanation below, however, this does not constitute a limitation on the structural type of the conveying component 32, and flexible components of other structural types can be applied to the present invention. The supporting component 321 can adopt a variety of structural forms, including but not limited to the supporting component 321 being configured to be a strip, disc or a shape profiling the local contour of the material extending perpendicular to the conveying direction, wherein the supporting part 321 of the material includes but is not limited to a plane, a curved surface or a shaped surface profiling the local contour of the material.

[0045] A plurality of supporting members 321 are attached to the outer surface of the flexible belt body 322 and are arranged along the extension direction of the flexible belt body 322. The conveying member 32 is assembled on the platform body 31 in a manner that the flexible belt body 322 is sleeved on all conveying rollers 33, so that the upper layer of the conveying member 32 forms a flat conveying plane, and the inner surface of the flexible belt body 322 defines an installation space to allow other devices to be installed in the installation space.

[0046] The flexible belt 322 and the supporting member 321 are configured as follows, for example:

[0047] A positioning strip 3221 is formed in the middle of the inner surface of the flexible belt body 322, and the positioning strip 3221 extends along the extension direction of the flexible belt body 322. An annular groove is arranged on the roller surface of the conveying roller 33. When the conveying roller 33 drives the flexible belt body 322 to rotate, the positioning strip 3221 cooperates with the annular groove to limit the flexible belt body 322 from moving in a direction perpendicular to the conveying direction (i.e., in the lateral direction, hereinafter the direction perpendicular to the conveying direction may be referred to as the lateral direction), which is beneficial to suppressing the lateral movement of the material on the conveying component 32.

[0048] The outer surface of the flexible belt 322 is formed with a plurality of protrusions 3222 , for example, rectangular strip-shaped protrusions 3222 , which are arranged at intervals along the extension direction of the flexible belt 322 . In some preferred structures, the protrusions 3222 and the flexible belt 322 are integrally formed.

[0049] The supporting member 321 is generally in the shape of a strip extending in the transverse direction, and a slot 3213 is configured in the middle of the bottom of the supporting member 321. When installing the supporting member 321, the protrusion 3222 on the flexible belt body 322 is inserted into the slot 3213 at the bottom of the supporting member 321, and the protrusion 3222 is fixed in the slot 3213 by bonding and fastener locking, so that the supporting member 321 is attached and positioned on the flexible belt. In this way, the supporting member 321 moves forward with the flexible belt body 322.

[0050] The upper surfaces of the supporting parts 321 on both sides of the flexible belt body 322 are configured with positioning structures, that is, the supporting parts 321 have positioning structures located on both sides of the flexible belt body 322 and have no overlapping areas with the flexible belt body 322. The positioning structures are used to carry materials so as to limit the movement of materials relative to the supporting parts in the conveying direction. Thus, during the process of conveying materials by the conveying parts, the materials are stably located on the supporting parts 321, which is conducive to the visual recognition system collecting image information of the materials and the rejection mechanism accurately rejecting the materials to be rejected.

[0051] The positioning structure can have various structural forms, for example, the positioning structure can be a plurality of edges protruding from the supporting member 321; the positioning member can be a depression, such as a spherical depression; the positioning member can be a positioning groove. The present invention does not limit the specific structural form of the positioning structure.

[0052] The present invention is described by taking the positioning groove 3211 as the positioning structure, but it should not be understood that the structural form of the positioning structure is limited.

[0053] Each supporting component 321 has two positioning grooves 3211. The positioning grooves 3211 of the supporting component 321 are used to limit the movement of the material falling thereon relative to the supporting component 321 in the conveying direction, so as to enable the visual recognition system to collect clear images and enable the rejection mechanism to accurately reject the material. In this way, the supporting component 321 that moves to the front of the discharging mechanism 20 with the flexible belt body 322 is used to receive two rows of materials discharged from the discharging mechanism 20, so that each set of conveying components 32 is used to convey two rows of materials positioned by the positioning grooves 3211 of the supporting component 321 forward.

[0054] The supporting member 321 is also provided with a rib 3212 in the area corresponding to the slot 3213. The rib 3212 is located between the two positioning slots 3211. Each positioning slot 3211 extends in the transverse direction and passes through the end of the supporting member 321. The slot 3213 extends toward the inside of the rib 3212. A screw (not shown) passes through the top of the rib 3212 and is screwed into the convex body 3222 located in the slot 3213 to fix the supporting member 321 on the flexible belt 322. The rib 3212 has a significant feature and function in that the rib 3212 is higher than the bottom of the two positioning slots 3211, so that the materials respectively located in the two positioning slots 3211 will not approach each other under the limitation of the rib 3212.

[0055] The significant advantage of the positioning groove 3211 extending laterally and penetrating to the end of the supporting member 321 is that if an airflow injection mechanism (to be described below) is selected as the rejection mechanism, when the airflow is injected to the material, the groove wall of the positioning groove 3211 makes the airflow flow more strictly in the horizontal direction, so that the airflow direction is consistent with the required movement direction of the material. In addition, the more significant advantage is that the groove wall of the positioning groove 3211 restricts the airflow from blowing to the material in the adjacent positioning groove 3211, so that the adjacent material is not affected by the airflow. The cross-section of the positioning groove 3211 includes but is not limited to U-shaped and V-shaped.

[0056] The conveying components 32 include multiple sets, and the multiple sets of conveying components 32 are arranged at intervals in the horizontal direction. The number of columns of conveyed materials defined by the multiple sets of conveying components 32 is the same as and corresponds to the number of columns of materials discharged from the discharging mechanism 20. Therefore, the conveying platform 30 can transport multiple columns of materials at the same time as required.

[0057] The supporting member 321 is made of a transparent material, that is, the supporting member 321 is configured to be transparent, and the supporting member 321 can be made of glass or plastic, but is not limited to these materials. Figure 1 As shown, the visual recognition system collects image information of the material by photographing the material. In the present invention, the visual recognition system includes at least two sets, for example, a first visual recognition system 41 and a second visual recognition system 42. The first visual recognition system 41 is arranged above the multiple sets of conveying components 32 to collect image information of the material on the supporting component 321 from above, and the second visual recognition system 42 is arranged below the multiple sets of conveying components 32 to collect image information of the material on the supporting component 321 from below through the supporting component 321. Since the supporting component 321 is transparent, the second visual recognition system 42 can collect image information of the material through the supporting component 321. According to the predetermined grade classification rules, the materials are divided into different grades.

[0058] The present invention does not limit the number of visual recognition systems and shooting angles. Since the supporting component 321 is configured to be transparent, the supporting component 321 will not block the light. Therefore, multiple sets of visual recognition systems can be used to shoot from different positions and angles to collect image information. The number, position and / or shooting angle of the visual recognition system depends on factors such as the screening accuracy of the material, the grade classification and the spatial position allowed for the installation of the equipment.

[0059] It should be noted that in the present invention, the so-called transparency does not refer to an absolutely transparent state. Any state that allows light and the image information of the material collected by the visual recognition system does not affect the grade classification is called transparent.

[0060] The rejection mechanism can be of various types. For example, the rejection mechanism can be a robot picking mechanism that uses a robot to pick up materials to reject them. For example, the rejection mechanism can be an airflow injection mechanism 50 that changes the conveying trajectory of the materials by injecting airflow to the materials to achieve the purpose of rejecting the materials. The present invention uses the airflow injection mechanism 50 as an example of the rejection mechanism. However, this cannot be understood as limiting the type of the rejection mechanism of the present invention.

[0061] The airflow injection mechanism 50 screens the materials of different grades by injecting airflow to the materials, and the airflow injection mechanism 50 screens and collects the materials by cooperating with the material receiving mechanism 60. Specifically, each conveying component 32 is equipped with a set of airflow injection mechanism 50, and the injection mechanism has a plurality of groups of nozzles arranged at intervals along the conveying direction, and each group of nozzles includes two nozzles (in the drawings, the nozzles are not shown, and only the mounting seat 51 for mounting the nozzles is shown), and the two nozzles are used to inject airflow in the lateral direction, and the directions of the airflows injected by the two nozzles are opposite to each other so as to inject airflow to the materials of the two supporting areas on the supporting component 321 respectively, so that the two materials of each supporting component 321 are screened by moving in opposite lateral directions.

[0062] It should be noted that it should not be understood that the two materials on the supporting part 321 are screened by simultaneously spraying airflow by two nozzles in the same group. If the two materials are classified into the same grade, the two materials can be screened by simultaneously spraying airflow. If the two materials are classified into different grades, one of the materials can be screened by spraying airflow by the corresponding nozzle in one group of nozzles, and the other material can be screened by spraying airflow by the corresponding nozzle in the other group of nozzles.

[0063] The material receiving mechanism 60 guides and receives materials of different grades. Specifically, the material receiving mechanism 60 includes a plurality of material receiving ports 61 and a transverse material guiding mechanism 62; a plurality of material receiving ports 61 are arranged on both sides of the conveying component 32, and the plurality of material receiving ports 61 are arranged along the conveying direction, and the material receiving ports 61 on each side are all facing the conveying component 32, and the airflow ejected by the nozzle of the airflow ejection mechanism 50 allows the material to enter the material receiving port 61; the transverse material guiding mechanism 62 includes a transverse conveying belt 622 driven by a transverse driving roller 621, and the transverse conveying belt 622 is used to receive the material from the material receiving port 61 and convey the material transversely to the side of the conveying platform 30. More preferably, a plurality of partition slats 623 are provided above the transverse conveyor belt 622, and the plurality of partition slats 623 respectively correspond to the plurality of adjacent material receiving ports 61 for respectively receiving materials from the plurality of material receiving ports 61. In this way, materials of different grades received by different material receiving ports 61 can be conveyed through the same transverse conveyor belt 622, and then, materials of different grades can be respectively introduced into different storage devices (such as storage boxes 70) through different inclined material guide channels 624.

[0064] The advantages of the conveying component 32, the conveying platform 30 and the multi-stage screening machine provided by the present invention are:

[0065] 1. By configuring a positioning structure on the supporting component 321, the material can be stably transported by the conveying component 32 to avoid the material moving relative to the conveying component 32, which is conducive to the visual recognition system to obtain a clear image of the material, and based on the positioning of the material by the supporting component 321, it is conducive to the rejection mechanism to accurately reject the material. The conveying component provided by the present invention is particularly suitable for conveying unstable materials, such as round materials, quasi-round materials, and other special-shaped materials. The multi-stage screening and selection machine provided by the present invention is particularly suitable for screening unstable materials.

[0066] 2. The supporting component 321 is configured to be transparent to prevent the supporting component from blocking light, thereby facilitating the visual recognition system to photograph the material from different positions and angles.

[0067] 3. In the supporting component 321 in which the positioning structure is configured as the positioning groove 321, the positioning groove 3211 has a better guiding effect on the lateral movement of the material and the airflow, so that the airflow pushes the material to move strictly in the lateral direction and avoids affecting the material on other supporting components 321.

[0068] 4. Other advantages are directly or implicitly stated above.

[0069] In addition, although exemplary embodiments have been described in the present invention, the scope includes any and all embodiments based on the present invention with equivalent elements, modifications, omissions, combinations (e.g., various embodiments intersecting schemes), adaptations or changes. The elements in the claims will be interpreted broadly based on the language adopted in the claims, and are not limited to the examples described in this specification or during the implementation of this application, and their examples will be interpreted as non-exclusive. Therefore, this specification and examples are intended to be considered as examples only, and the true scope and spirit are indicated by the following claims and the full scope of their equivalents.

[0070] The above description is intended to be illustrative rather than restrictive. For example, the above examples (or one or more of them) can be used in combination with each other. For example, a person of ordinary skill in the art can use other embodiments when reading the above description. In addition, in the above-mentioned specific embodiments, various features can be grouped together to simplify the present invention. This should not be interpreted as an intention that a disclosed feature that is not required to be protected is necessary for any claim. On the contrary, the subject matter of the present invention may be less than all the features of a specific disclosed embodiment. Thus, the following claims are incorporated into the specific embodiments as examples or embodiments, wherein each claim is independently used as a separate embodiment, and it is considered that these embodiments can be combined with each other in various combinations or arrangements. The scope of the present invention should be determined with reference to the attached claims and the full scope of equivalent forms granted by these claims.

[0071] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A multi-stage screening machine, characterized in that: include: A conveying platform, comprising a platform body, conveying rollers installed on the front and rear sides of the platform body, and at least one set of conveying components driven by the conveying rollers, wherein the conveying components are used to convey materials forward, and the conveying components include: a flexible component and a plurality of supporting components; the plurality of supporting components are arranged along the extension direction of the flexible component and attached to the outer side of the flexible component; the areas of the supporting components located on both sides of the flexible component are both configured with positioning structures, and the positioning structures are used to receive materials and limit the movement of materials relative to the supporting components, so that during the process of the conveying components conveying materials, the materials are stably located on the supporting components; A visual recognition system, which is used to collect image information of the material on the supporting member and classify the material into different grades based on the image information; A rejecting mechanism, which is used to reject materials classified into different grades from the supporting component of the conveying component; The material receiving mechanism is used to guide and receive materials of different grades removed from the conveying components.

2. The multi-stage screening machine according to claim 1, characterized in that: The flexible component comprises a flexible belt body, a plurality of convex bodies are formed on the outer surface of the flexible belt body, a slot is configured at the bottom of the supporting component, and the convex bodies are inserted into the slot so that the supporting component is attached to the flexible belt body.

3. The multi-stage screening machine according to claim 2, characterized in that: The positioning structure comprises a positioning groove, which extends perpendicularly to the conveying direction and passes through the end of the supporting component.

4. The multi-stage screening machine according to claim 3, characterized in that: The supporting component is provided with a convex rib at a position corresponding to the slot, and the slot extends to the inside of the convex rib; wherein: The convex rib is higher than the bottom of the positioning groove.

5. The multi-stage screening machine according to claim 3, characterized in that: The supporting member is configured to be transparent.

6. The multi-stage screening machine according to claim 1, characterized in that: The rejection mechanism includes an airflow injection mechanism, each of the conveying components is equipped with a set of airflow injection mechanisms, the injection mechanism has a plurality of groups of nozzles arranged at intervals along the conveying direction, each group of nozzles includes at least two nozzles, and the at least two nozzles are used to spray airflow on a horizontal reference perpendicular to the conveying direction, and the directions of the airflows sprayed by the two nozzles are opposite so as to respectively spray airflow at the materials in the two supporting areas on the supporting component.

7. The multi-stage screening machine according to claim 1, characterized in that: The visual recognition system comprises at least two sets, and the at least two sets of the visual recognition system are respectively arranged above and below the conveying component to collect image information of the material from above and below respectively.

8. The multi-stage screening machine according to claim 1, characterized in that: The material receiving mechanism includes a plurality of material receiving ports and a transverse material guiding mechanism; wherein: A plurality of receiving ports are disposed on both sides of the conveying component, and the plurality of receiving ports are arranged along the conveying direction, and the receiving ports on each side face the conveying component, and the airflow ejected by the nozzle of the airflow ejection mechanism causes the material to enter the receiving port; The transverse material guiding mechanism includes a transverse conveyor belt, which is used to receive the material from the material receiving port and convey the material transversely to the side of the conveying platform.

9. The multi-stage screening machine according to claim 9, characterized in that: A plurality of partition slats are arranged above the transverse conveyor belt, and the plurality of partition slats respectively correspond to the plurality of adjacent material receiving ports so as to respectively receive materials from the plurality of material receiving ports.

10. The multi-stage screening machine according to claim 1, characterized in that: The conveying components include a plurality of sets, and the plurality of sets of conveying components are arranged at intervals perpendicular to the conveying direction.

Images