Material sorting teaching device

By designing a detachable material sorting teaching device, the problems of large footprint and complex structure of existing conveying and sorting devices in practical training have been solved, thus enriching the teaching content and improving students' programming skills.

CN223717752UActive Publication Date: 2025-12-26GUANGZHOU EMMAN INTELLIGENT TECH CO LTD
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Patent Information

Application Number
CN202423219700.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-12-25
Publication Date
2025-12-26
Estimated Expiration
2034-12-25

AI Technical Summary

Technical Problem

Existing conveying and sorting devices occupy a large area, have complex structures, poor disassembly capabilities, and limited functions, resulting in significant limitations in teaching and poor training effectiveness.

Method used

A material sorting teaching device was designed, including a base plate, a feeding unit, a material supply unit, a material detection unit, a sorting unit, and a sorting detection unit. Each unit is detachable and can be installed to simulate an actual conveying and sorting device. The device also realizes simulated teaching of the material sorting process through a control unit.

Benefits of technology

This approach enriches and diversifies teaching content, improves teaching efficiency and student engagement, meets the needs of visual teaching, and enables students to simulate actual production lines through programming, identify programming errors, and improve their programming skills.

✦ Generated by Eureka AI based on patent content.

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  • Figure CN223717752U_ABST
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Abstract

The utility model relates to a material sorting teaching device. The material sorting teaching device of the utility model comprises a substrate; the feeding unit is detachably mounted on the base plate and is used for feeding along the direction of the conveyor belt; the feeding unit is detachably mounted on one side of the conveying belt and supplies materials to the conveying belt; the material detection unit is used for detecting materials on the conveying belt; the sorting unit is detachably mounted on one side of the conveying belt and is used for classifying and storing the materials; the sorting detection unit is detachably mounted on the sorting unit and used for detecting whether the sorting unit succeeds in discharging or not; and the control unit is electrically connected with the feeding unit, the feeding unit, the material detection unit, the sorting unit and the sorting detection unit. According to the material sorting teaching device of the utility model, all the units cooperate with each other to complete a typical material sorting process, and all the units can independently carry out practical training teaching; all the units are detachably installed, different functional units can be replaced according to teaching requirements, and the teaching content is enriched.
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Description

TECHNICAL FIELD

[0001] The utility model relates to teaching equipment technical field especially relates to a material sorting teaching device. BACKGROUND

[0002] In the practical teaching, the production operation is demonstrated through the close actual conveying sorting device, the theory study is combined with the live demonstration, can make the trainee in the practical training process obtains greater harvest. However, the conveying sorting device for actual production occupies large floor area, the structure is complex, the detachability is poor, and the conventional conveying sorting device is usually single function, is not favorable to planning the course, and the teaching has great limitation, leads to the effect of the practical training to be poor. CONTENT OF UTILITY MODEL

[0003] Therefore, the utility model discloses the purpose is to provide a material sorting teaching device.

[0004] A material sorting teaching device, including: base plate, feeding unit, including conveyer belt, for conveying material along the conveyer belt direction, detachably fixedly installed on the base plate, feeding unit, detachably installed on one side of the conveyer belt and located in the front of the conveyer belt conveying direction, supplies the material to the conveyer belt, material detection unit, located behind the feeding unit along the conveyer belt conveying direction, for detecting the material on the conveyer belt, sorting unit, detachably installed on one side of the conveyer belt, located behind the material detection unit along the conveyer belt conveying direction, according to the detection result of the material detection unit, classifies and stores the material, sorting detection unit, detachably installed on the sorting unit, detects whether the sorting unit successfully discharges, control unit, with feeding unit, feeding unit, material detection unit, sorting unit, sorting detection unit electric connection respectively, to control the process of sorting the material,

[0005] The feeding unit, the material detection unit, the sorting unit and the sorting detection unit are arranged on the base plate.

[0006] The material sorting teaching device can complete the typical material sorting process by cooperation between the units, and each unit can be individually used for practical teaching.

[0007] Further, the feeding unit includes a first fixing seat, a second fixing seat, a first transmission roller, a second transmission roller, a third transmission roller, a conveyer belt, a belt and a driving motor.

[0008] The first transmission roller is installed on the first fixed seat, the second transmission roller and the third transmission roller are installed on the second fixed seat, the first transmission roller and the second transmission roller are connected in transmission through the conveying belt, and the second transmission roller and the third transmission roller are connected in transmission through the belt.

[0009] Through the technical scheme, the driving motor drives the conveying belt to move to realize the transportation of the material.

[0010] Further, the feeding unit comprises a material carrying flat plate, a material carrying cylinder, a material pushing rod and a material pushing cylinder.

[0011] The material carrying flat plate is arranged in front of the conveying direction of the conveying belt, and the plate surface is flush with the conveying surface of the conveying belt; the material carrying cylinder is arranged above one end of the material carrying flat plate close to the conveying belt, and a through groove is formed in the side surface and bottom of the material carrying cylinder and communicates with the conveying belt; the material pushing rod and the material pushing cylinder are arranged on the side of the material carrying flat plate away from the conveying belt, one end of the material pushing rod is connected with the piston rod of the material pushing cylinder, and the other end of the material pushing rod is retractable in the through groove.

[0012] Through the technical scheme, the feeding unit stores the material and supplies the material to the conveying belt.

[0013] Further, the material detection unit comprises a position detector, a material quality detector and a color detector; along the conveying direction of the conveying belt, the position detector and the material quality detector are located on both sides of the conveying belt, and the color detector is close to the material quality detector.

[0014] Through the technical scheme, the position detector judges whether the material enters the detection area, and the material quality detector and the color detector roughly detect the material quality and color of the material.

[0015] Further, the material detection unit further comprises a visual detector, the visual detector comprises a mounting frame, a second connecting plate, a light source and an industrial camera; the mounting frame is fixedly installed on one side of the conveying belt, the second connecting plate is detachably installed on the mounting frame, and the light source and the industrial camera are fixedly installed on the second connecting plate and located above the conveying belt.

[0016] Through the technical scheme, the industrial camera takes a picture of the material, and then the material image is analyzed according to specific teaching needs for more detailed detection.

[0017] Further, the center line of the light source is located on the same straight line as the center line of the lens of the industrial camera.

[0018] Through the technical scheme, the lighting effect of the light source is better.

[0019] Furthermore, the sorting unit includes a feeding trough, a third connecting plate, a baffle cylinder, and a baffle. The feeding trough is disposed on one side of the conveyor belt. The third connecting plate is detachably installed on the side of the conveyor belt opposite to the feeding trough. The baffle cylinder is fixedly installed on the third connecting plate, and its piston rod extends vertically. The baffle is connected to the piston rod of the baffle cylinder, and its plate surface is parallel to the conveyor belt. The baffle can descend to contact the conveyor belt and / or rise above the conveyor belt.

[0020] The above technical solution achieves material sorting through the cooperation of baffles and feeding troughs.

[0021] Furthermore, the baffle has a guide slope on the side facing upstream of the conveyor belt to guide the material to the side of the discharge chute.

[0022] The above technical solution guides the material into the feeding trough by using a guiding ramp.

[0023] Furthermore, the sorting and detection unit includes at least two fourth connecting plates and at least two photoelectric sensors; projected along the feeding direction of the conveyor belt, the fourth connecting plates are detachably installed on both sides of the unloading chute, and the photoelectric sensors are fixedly installed on the fourth connecting plates, with their optical paths on the same straight line.

[0024] Using the above technical solution, two photoelectric sensors detect whether the material has successfully entered the feeding trough.

[0025] Furthermore, handles are provided on both sides of the substrate along its length.

[0026] The above technical solution allows users to easily transport the material sorting teaching device to different locations for teaching.

[0027] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0028] Figure 1 A three-dimensional structural diagram of the material sorting teaching device provided by this utility model;

[0029] Figure 2 A schematic diagram of the feeding unit provided by this utility model;

[0030] Figure 3 for Figure 1 Enlarged view of point A in the middle;

[0031] Figure 4 for Figure 1 Enlarged view of point B in the middle. Detailed Implementation

[0032] The applicant analyzes the existing actual production conveying and sorting device and the material sorting device for teaching, and finds that the actual production conveying and sorting device is usually fixed in a place and produces one product, so it does not need to be moved everywhere and the structure does not need to be changed frequently, while the material sorting teaching device is different, which needs to be moved to different places frequently, such as different classrooms and laboratories, and different modules need to be used for demonstration according to different teaching contents. Therefore, the applicant provides a material sorting teaching device which highly simulates the actual conveying and sorting device, and sets a base plate handle to facilitate moving to different places, and each module is independent and can be freely disassembled, so that the material sorting teaching device can be freely combined according to the teaching requirement. The following is one of the embodiments of the material sorting teaching device of the utility model:

[0033] Please refer to Figures 1 to 4 , Figure 1 The utility model provides a three-dimensional structure schematic diagram of material sorting teaching device; Figure 2 The utility model provides a structure schematic diagram of feeding unit; Figure 3 It is Figure 1 The utility model provides a structure schematic diagram of feeding unit; Figure 4 It is Figure 1 The utility model provides a structure schematic diagram of feeding unit;

[0034] The utility model provides a material sorting teaching device, including base plate 1, feeding unit 2, feeding unit 3, material detection unit 4, sorting unit 5, sorting detection unit 6 and control unit (not shown in the drawing). Wherein, the feeding unit 2, the feeding unit 3, the material detection unit 4, the sorting unit 5, the sorting detection unit 6 and the control unit are installed on the base plate 1, along the feeding direction of the feeding unit 2, the feeding unit 3, the material detection unit 4, the sorting unit 5 and the sorting detection unit 6 are set on the base plate 1. Preferably, the base plate 1 length direction both sides are also provided with handle 11, make the user move the material sorting teaching device to different places.

[0035] The feeding unit 2 is used for transporting materials, comprising two support seats 21, a first fixed seat 22, a second fixed seat 23, a first transmission roller 24, a second transmission roller 25, a third transmission roller 26, a transmission belt 27, a belt 28 and a driving motor 29. The two support seats 21 which are separated by a certain distance are installed on the base plate 1 by screws, and the first fixed seat 22 and the second fixed seat 23 are respectively installed on the support seats 21. The first transmission roller 24 is installed on the first fixed seat 22, the second transmission roller 25 and the third transmission roller 26 are installed on the second fixed seat 23, and the axes of the first transmission roller 24, the second transmission roller 25 and the third transmission roller 26 are parallel to each other. The transmission belt 27 is sleeved between the first transmission roller 24 and the second transmission roller 25, forming an upward and horizontally extending conveying surface (not marked in the figure). The first transmission roller 24 and the second transmission roller 25 are drivingly connected through the transmission belt 27, and the second transmission roller 25 and the third transmission roller 26 are drivingly connected through the belt 28. The output shaft of the driving motor 29 is connected with the third transmission roller 26, forming a transmission belt conveying structure. In addition, the two support seats 21 and the first fixed seat 22, the second fixed seat 23 can be a split structure, or can be an integral structure.

[0036] The working principle of the feeding unit 2 is as follows: start the driving motor 29, the driving motor 29 drives the third transmission roller 26 to rotate, the third transmission roller 26 drives the second transmission roller 25 to rotate through the belt 28, the second transmission roller 25 drives the first transmission roller 24 to rotate through the transmission belt 27, and the transmission belt 27 moves directionally between the first transmission roller 24 and the second transmission roller 25, the materials are placed above the transmission belt 27, thereby realizing the transportation of the materials.

[0037] The feeding unit 3 stores and supplies materials to the feeding unit 2, including a material loading plate 31, a material loading cylinder 32, a material pushing rod 33 and a material pushing cylinder 34. Specifically, the material loading plate 31 is arranged upstream of the feeding unit 2, with its plate surface flush with the conveying surface of the conveyor belt 27 and extending perpendicular to the feeding direction of the feeding unit 2. The material loading cylinder 32 is a cylindrical body arranged on the side of the material loading plate 31 close to the conveyor belt 27. The materials for practical sorting are solid materials, which can be spherical steel balls of different colors and / or materials, block-shaped blocks, etc. The material loading cylinder 32 can stack multiple materials in the vertical direction. The bottom of the material loading cylinder 32 is provided with a through slot 321 for a single material to pass through, and the outlet of the through slot 321 faces the conveyor belt 27. The material pushing rod 33 and the material pushing cylinder 34 are arranged on the side of the material loading plate 31 away from the conveyor belt 27. One end of the material pushing rod 33 is connected to the piston rod of the material pushing cylinder 34, and the other end extends into the through slot 321 and contacts the material at the bottom of the material loading cylinder 32. The material pushing rod 33 can extend and retract along the extension direction of the material loading plate 31 towards the conveyor belt 27. The material pushing cylinder 34 drives the material pushing rod 33 to push the material at the bottom of the material loading cylinder 32 out of the through slot 321 and into the conveyor belt 27, thereby completing the feeding.

[0038] Please refer to Figure 3 The material detection unit 4 detects the characteristics of the materials, including a position detector 41, a material detector 42, a color detector 43 and three first connecting plates 44. The three first connecting plates 44 are respectively installed on the two sides upstream of the conveyor belt 27 by screws, with their plate surfaces flush with the conveying surface of the conveyor belt 27. The position detector 41, the material detector 42 and the color detector 33 are respectively fixedly installed on the first connecting plates 44. Among them, projected along the feeding direction of the conveyor belt 27, the position detector 41 and the material detector 42 are respectively located on the opposite sides of the conveyor belt 27, and the color detector 43 is close to the material detector 42. In this embodiment, the position detector 41 is a capacitive sensor. When a material approaches the capacitive sensor, the capacitance between the two internal electrodes of the sensor changes, which can detect the position of the material by detecting the change of the capacitance and identify whether the material enters the detection area. The material detector 42 is an inductive sensor, which has an induced magnetic field inside. When a material approaches the inductive sensor, it will change the strength or direction of the induced magnetic field, thereby causing a change in the induced voltage. By detecting the change of the induced voltage, the characteristics of the material are determined, so as to identify the material by material. The color detector 43 is an optical sensor, which emits light to the passing material and receives reflected light. By analyzing the spectrum of the received reflected light, the degree of reflection or transmission of different colors of the material is determined, so as to determine the color of the material.

[0039] Please refer to Figure 1 Preferably, the material detection unit 4 further comprises a visual identifier 45. The visual identifier 45 performs detailed detection on the material, including a mounting frame 451, a second connecting plate 452, a light source 453 and an industrial camera 454. The mounting frame 451 is mounted on the base plate 1 and located on one side of the conveying belt 27, and includes a vertical part 4511 and a horizontal part 4512. The horizontal part 4512 is located above the conveying belt 27. The second connecting plate 452 is detachably mounted on the horizontal part 4512. The light source 453 and the industrial camera 454 are fixedly mounted on the second connecting plate 452, and the center line of the light source 453 and the center line of the lens of the industrial camera 454 are located on the same straight line. The light source 453 is a ring-shaped light source, which projects light onto the conveying belt 27 below, can improve the brightness of the shooting surface, and reduce the influence of insufficient natural light on the shooting brightness. The industrial camera 454 faces the conveying belt 27 and is used to shoot images of the material, which can adapt to corresponding detection functions according to different analyses of the images according to specific needs, such as surface defect detection, integrity detection, surface size measurement, bar code recognition, two-dimensional code recognition, character recognition, and contour feature recognition. The detection accuracy is improved, and the richness of the detection content is expanded.

[0040] Please refer to Figure 4The sorting unit 5 sorts and stores the materials detected by the material detection unit 4, including a discharging chute 51, a third connecting plate 52, a baffle cylinder 53 and a baffle 54. In the feeding direction of the conveying belt 27, the discharging chute 51 is arranged on one side of the conveying belt 27 and has a semi-closed structure with an opening facing the conveying belt 27 for storing materials. The third connecting plate 52 is installed on the other side of the conveying belt 27 opposite the discharging chute 51 by screws. The baffle cylinder 53 is fixedly installed on the third connecting plate 52, and the piston rod of the baffle cylinder 53 extends in the vertical direction. The baffle 54 is connected to the piston rod of the baffle cylinder 53. The surface of the baffle 54 is parallel to the conveying surface of the conveying belt 27, and a guide slope 541 is arranged on the side of the baffle 54 facing the upstream side of the conveying belt 27 to guide the materials to the side of the discharging chute 51. When the baffle cylinder 53 drives the baffle 54 to descend, the surface of the baffle 54 approaches the conveying belt 27, and at this time, the baffle 54 is located on the material movement track on the conveying belt 27 to achieve the blocking and guiding of the materials. When the baffle cylinder 53 drives the baffle to rise, the surface of the baffle 54 is away from the conveying belt 27, and at this time, the baffle 54 is away from the material movement track to allow the materials to pass. In this embodiment, the materials are divided into two categories according to the teaching needs, and the number of the discharging chute 51, the third connecting plate 52, the baffle cylinder 53 and the baffle 54 is two. According to the detection result of the material detection unit 4, the corresponding baffle 54 is controlled to descend to the material movement track to guide the discharging of the materials to complete the storage of different types of materials. In other embodiments, the baffle 54 can be moved to the material movement track on the conveying belt 27 by horizontal rotation or horizontal movement to complete the guiding of the materials, and is not limited thereto.

[0041] In this embodiment, the sorting detection unit 6 detects whether the materials successfully enter the discharging chute 51, including at least two fourth connecting plates 61 and at least two photoelectric sensors 62. In the feeding direction of the conveying belt 27, the two fourth connecting plates 61 are respectively installed on the front and rear sides of the discharging chute 51 by screws, and the two photoelectric sensors 62 are respectively fixedly installed on the two fourth connecting plates 61, and the light paths of the two photoelectric sensors 62 are on the same straight line. By detecting whether the received light intensity changes, it is determined whether the materials pass through the light path to determine whether the materials are successfully discharged. Further, the two discharging chutes 51 are separated by a certain distance in the feeding direction of the conveying belt 27, and two photoelectric sensors 62 are arranged on the two sides of each discharging chute 51 to detect whether the materials are successfully sorted and discharged into the corresponding discharging chute 51.

[0042] The control unit controls the sorting device, including a PLC controller and a computer.

[0043] The working principle of the utility model is as follows: the feeding unit 3 pushes the material to the conveying belt 27, along with the transportation of the material, the position detector 41 detects that the material enters the detection area, and the output signal controls the material detector 42 and the color detector 43 to carry out preliminary detection, the detection signal of the material detector 42 and the color detector 42 is sent to the PLC controller, the PLC controller displays the detection result through the computer, according to the detection result, the computer controls the light source 453 to light, and the industrial camera 454 is used to take a photo of the material, the industrial camera 454 sends the photo to the computer, the computer processes the received image signal, completes the category identification of the material according to the preset classification standard, and controls the corresponding baffle 54 to descend to the moving track of the material through the PLC controller, guides the material into the corresponding material receiving groove 51.

[0044] Compared with the prior art, the material sorting teaching device provided by the utility model has the following advantages:

[0045] (1) The utility model integrates material providing, material identification, material sorting and other modules, students can fully experience the material sorting process, not only can meet the requirements of traditional classroom, but also can mobilize the enthusiasm of students, improve the classroom efficiency, and meet the needs of visual teaching.

[0046] (2) The utility model controls the whole device through the computer and the PLC controller, can import the PLC control program written by students to carry out sorting production simulation during teaching, students can accurately find out the errors of the program written by themselves according to the actual operation of the production line, and the teaching is more convenient.

[0047] (3) The utility model uses a visual detector to detect the material in detail, can expand different detection contents according to the teaching needs, and improves the programming ability of students.

[0048] The above-described embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but can not therefore be understood as the limitation of the utility model patent range. It should be pointed out that for ordinary skilled person in the art, without departing from the concept of the utility model, several modifications and improvements can be made, and the utility model also intends to include these changes and modifications.

Claims

1. A material sorting teaching device, characterized by, The utility model relates to a material sorting device, including: A base plate (1); A feeding unit (2) comprising a conveying belt (27) for conveying materials along the conveying direction of the conveying belt (27) and being detachably mounted on the base plate (1); A feeding unit (3) being detachably mounted on one side of the conveying belt (27) and located in front of the conveying direction of the conveying belt (27) to supply materials to the conveying belt (27); A material detection unit (4) being located behind the feeding unit (3) along the conveying direction of the conveying belt (27) to detect the materials on the conveying belt (27); A sorting unit (5) being detachably mounted on one side of the conveying belt (27) and located behind the material detection unit (4) along the conveying direction of the conveying belt (27) to sort and store the materials according to the detection results of the material detection unit (4); A sorting detection unit (6) being detachably mounted on the sorting unit (5) to detect whether the sorting unit (5) successfully discharges materials or not; A control unit being electrically connected with the feeding unit (2), the feeding unit (3), the material detection unit (4), the sorting unit (5) and the sorting detection unit (6) to control the process of sorting materials. The feeding unit (3), the material detection unit (4), the sorting unit (5) and the sorting detection unit (6) are arranged on the base plate (1).

2. The material sorting teaching device of claim 1, wherein: The feeding unit (2) comprises a first fixing seat (22), a second fixing seat (23), a first transmission roller (24), a second transmission roller (25), a third transmission roller (26), a conveying belt (27), a belt (28) and a driving motor (29). The first transmission roller (24) is mounted on the first fixing seat (22), the second transmission roller (25) and the third transmission roller (26) are mounted on the second fixing seat (23), the first transmission roller (24) and the second transmission roller (25) are transmissionally connected through the conveying belt (27), the second transmission roller (25) and the third transmission roller (26) are transmissionally connected through the belt (28), and the output shaft of the driving motor (29) is connected with the third transmission roller (26).

3. The material sorting teaching device of claim 2, wherein: The feeding unit (3) comprises a material loading flat plate (31), a material loading cylinder (32), a material pushing rod (33) and a material pushing cylinder (34). The material loading flat plate (31) is arranged in front of the conveying direction of the conveying belt (27) and the plate surface is flush with the conveying surface of the conveying belt (27), the material loading cylinder (32) is arranged above one end of the material loading flat plate (31) close to the conveying belt (27) and the side surface bottom is provided with a through slot (321) communicated with the conveying belt (27), the material pushing rod (33) and the material pushing cylinder (34) are arranged on the side of the material loading flat plate (31) away from the conveying belt (27), one end of the material pushing rod (33) is connected with the piston rod of the material pushing cylinder (34) and the other end is telescopic in the through slot (321).

4. The material sorting teaching device of claim 2, wherein: The material detection unit (4) comprises a position detector (41), a material detector (42) and a color detector (43); the position detector (41) and the material detector (42) are located on both sides of the conveying belt (27) in the projection direction of the conveying belt (27), and the color detector (43) is close to the material detector (42).

5. The material sorting teaching device of claim 4, wherein: The material detection unit (4) further comprises a visual detector (45), which comprises a mounting frame (451), a second connecting plate (452), a light source (453) and an industrial camera (454); the mounting frame (451) is fixedly installed on one side of the conveying belt (27), the second connecting plate (452) is detachably installed on the mounting frame (451), and the light source (453) and the industrial camera (454) are fixedly installed on the second connecting plate (452) and located above the conveying belt (27).

6. The material sorting teaching device of claim 5, wherein: The center line of the light source (453) is located on the same straight line as the center line of the lens of the industrial camera (454).

7. The material sorting teaching device of claim 2, wherein: The sorting unit (5) comprises a discharging chute (51), a third connecting plate (52), a baffle cylinder (53) and a baffle (54), the discharging chute (51) is arranged on one side of the conveying belt (27), the third connecting plate (52) is detachably installed on the other side of the conveying belt (27) opposite to the discharging chute (51), the baffle cylinder (53) is fixedly installed on the third connecting plate (52), and the piston rod thereof extends in the vertical direction; the baffle (54) is connected with the piston rod of the baffle cylinder (53), and the plate surface thereof is parallel to the conveying belt (27); the baffle (54) can be lowered to be close to the conveying belt (27) and / or raised above the conveying belt (27).

8. The material sorting teaching apparatus of claim 7, wherein: A guide inclined surface (541) for guiding the material to be discharged to one side of the discharging chute (51) is arranged on the side of the baffle (54) facing the upstream side of the conveying belt (27).

9. The material sorting teaching device of claim 7, wherein: The sorting detection unit (6) comprises at least two fourth connecting plates (61) and at least two photoelectric sensors (62); along the feeding direction of the conveying belt (27), the fourth connecting plates (61) are respectively detachably installed on both sides of the discharging chute (51), and the photoelectric sensors (62) are respectively fixedly installed on the fourth connecting plates (61), and the light paths thereof are on the same straight line.

10. The material sorting teaching apparatus of claim 1, wherein: The two sides of the length direction of the substrate (1) are further provided with handles (11).