Fruit and vegetable sorting machine with low wrong sorting rate

CN222535547UActive Publication Date: 2025-02-28SHENZHEN DAOCHUANG INTELLIGENT INNOVATION TECH CO LTD
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Patent Information

Application Number
CN202421045591.X
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-05-14
Publication Date
2025-02-28
Estimated Expiration
2034-05-14

AI Technical Summary

Technical Problem

The existing fruit and vegetable sorting equipment has missed distribution and mixing, resulting in low sorting quality.

Method used

A low-missing rate fruit and vegetable sorting machine is designed, adopting a screening platform and sorting device. The sorting device includes a sorting channel and a rotatable guide plate, and the sorting flow direction of the fruit and vegetable is controlled through the opening and closing state of the guide plate.

Benefits of technology

It effectively reduces the probability of fruits and vegetables missed distribution and mixing, improves sorting quality, and ensures that fruits and vegetables are allocated to the correct area according to standards.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of fruit and vegetable sorting equipment, and discloses a fruit and vegetable sorting machine with a low wrong sorting rate, which comprises a screening platform, and a feeding conveying channel and a sorting device are arranged on the top surface of the screening platform; the sorting device comprises a sorting channel and a material guide plate, a feeding port of the sorting channel faces the feeding conveying channel, and the material guide plate is hinged to one side of the feeding port and can be switched between an open state and a closed state back and forth; when the material guide plate is in the closed state, the material guide plate closes the feeding hole; when the material guide plate is in the open state, the material guide plate obliquely extends from one side of the feeding conveying channel to the other opposite side of the feeding conveying channel relative to the conveying direction of the feeding conveying channel so that the fruits and vegetables conveyed by the feeding conveying channel can be guided into the sorting channel. By means of the mode, the phenomenon of missing distribution of fruits and vegetables can be reduced to a great extent, so that the probability of material mixing is reduced, and the technical problem that the fruit and vegetable sorting quality is low due to material mixing is solved.
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Description

Technical Field

[0001] The utility model relates to the technical field of fruit and vegetable sorting equipment, in particular to a fruit and vegetable sorting machine with a low misclassification rate. Background Art

[0002] The appearance quality of fruits and vegetables is one of the important factors affecting sales and prices. The traditional manual sorting method is not only inefficient, but also prone to misjudgment and missed detection. Therefore, an efficient and accurate fruit and vegetable sorting mechanism is needed to improve product quality and market competitiveness. In the prior art, some fruit and vegetable appearance sorting equipment has appeared, such as visual sorting machines, weight sorting machines, etc. Although these devices can improve sorting efficiency and accuracy, there are still some problems. For example, although the sorting machine sorts different fruits and vegetables based on appearance or weight considerations, then, in the subsequent process of using a distribution component to push specific fruits and vegetables to a specific area, due to the influence of uncertain factors such as the wrong distribution timing of the distribution component, the jumping of fruits and vegetables over the distribution component, and the damage of the distribution component, it is inevitable that the distribution of fruits and vegetables will be missed. The flow direction of the missed fruits and vegetables is uncertain, and they often flow to non-specific areas, causing the phenomenon of mixing, and there is a technical problem of low quality of fruit and vegetable sorting. Utility Model Content

[0003] In view of the existing technical problems, the purpose of the utility model is to provide a fruit and vegetable sorting machine with a low probability of misclassification, which can solve the technical problem of low fruit and vegetable sorting quality described in the background technology.

[0004] The technical solution to achieve the purpose of the utility model is:

[0005] A fruit and vegetable sorting machine with a low misclassification rate comprises a screening platform, a top surface of which is provided with a feed conveying path for conveying fruits and vegetables to be sorted and a sorting device; the sorting device comprises a sorting channel and a guide plate, a feed port of the sorting channel faces the feed conveying path, the guide plate is hinged to one side of the feed port, and can be switched back and forth between an open state and a closed state by rotation; when the guide plate is in a closed state, the guide plate closes the feed port; when the guide plate is in an open state, the guide plate extends obliquely from one side of the feed conveying path to the other side opposite to the feed conveying path relative to the transmission direction of the feed conveying path, so as to guide the fruits and vegetables transported by the feed conveying path into the sorting channel.

[0006] In one embodiment, two sorting devices are configured, and the two sorting devices are respectively arranged on two opposite sides of the feed conveying path.

[0007] In one embodiment, among the two sorting devices, when the guide plate of one is in a closed state and the guide plate of the other is in an open state, the end of the guide plate in the open state abuts against the guide plate in the closed state; when the guide plates of the sorting devices are both in a closed state, the fruits and vegetables are transported forward by the feed conveyor path.

[0008] In one embodiment, the sorting device includes a first baffle, a second baffle and at least one first roller group for conveying fruits and vegetables. The first baffle and the second baffle are protruded from the top surface of the screening platform at intervals, and the first roller group is located between the first baffle and the second baffle; a side of the first baffle facing the feed conveying path and a side of the second baffle facing the feed conveying path define a feed port.

[0009] In one embodiment, a first groove is formed on the top surface of the screening platform, and the shape of the first groove is adapted to the shape of the first roller group; the first roller group is arranged in the first groove, and the top surface of the first roller group is exposed outside the notch of the first groove; the first roller group includes a plurality of first power rollers arranged in parallel along the transmission direction of the first roller group.

[0010] In one embodiment, the feed conveyor includes a second roller group for conveying fruits and vegetables; the screening platform includes a first side and a second side opposite to each other; the second roller group extends from the first side to the second side; the first roller group extends obliquely from one side of the second roller group toward the second side; the direction in which the first roller group extends is parallel to the conveying direction of the first roller group; and the direction in which the second roller group extends is parallel to the conveying direction of the second roller group.

[0011] In one embodiment, a second groove is provided on the top surface of the screening platform, the shape of the second groove is adapted to the shape of the second roller group, the second roller group is arranged in the second groove, and the top surface of the second roller group is exposed at the notch of the second groove; the second roller group includes a plurality of second power rollers arranged in parallel along the transmission direction of the second roller group.

[0012] In one embodiment, in the two sorting devices, when the guide plate of one is in a closed state, the guide plate of the other is in an open state; and the end of the guide plate in the open state abuts against the guide plate in the closed state.

[0013] In one embodiment, the first baffle is located between the second roller group and the first side; the second baffle is located between the second roller group and the second side; the guide plate is hinged to the side of the second baffle facing the feed conveying path; when the guide plate is in a closed state, the side of the guide plate away from the second baffle abuts against the side of the first baffle facing the feed conveying path.

[0014] In one embodiment, a rotary drive member is provided on the bottom surface of the screening platform, and an output shaft of the rotary drive member is connected to a hinge shaft of the guide plate to drive the guide plate to rotate forward and reverse.

[0015] In one embodiment, the height of the first side is higher than the height of the second side.

[0016] In one embodiment, the bottom surface of the screening platform is provided with a first support group corresponding to the first side position and a second support group corresponding to the second side position; the first support group includes at least one first pillar, and the top of the first pillar is hinged to the screening platform; the second support group includes at least one second pillar, and the top height of the second pillar is less than the top height of the first pillar; the screening platform is also provided with a slide groove extending from the second side toward the first side; the top of the second pillar is slidably connected to the slide groove, and when the top of the second pillar moves along the slide groove, the height of the second side changes adaptively.

[0017] The beneficial effects of this application are:

[0018] The top surface of the screening platform of the present application is provided with a feeding conveyor and a sorting device for conveying fruits and vegetables to be sorted. The sorting device includes a sorting channel and a guide plate, and the feed port of the sorting channel faces the feeding conveyor. The guide plate can be switched back and forth between an open state and a closed state by rotating.

[0019] When fruits and vegetables do not meet the screening criteria of a certain sorting device, the guide plate of the sorting device is in a closed state, and the guide plate closes the feed port. This can greatly prevent fruits and vegetables that do not meet the standards from entering the corresponding sorting channel from the feed port. Fruits and vegetables that do not meet the selection criteria continue to be transported forward to another area through the feed conveyor channel.

[0020] When the fruits and vegetables meet the screening criteria of a certain sorting device, when the guide plate is in an open state, the guide plate extends obliquely from one side of the feed conveyor path to the other side opposite to the feed conveyor path relative to the transmission direction of the feed conveyor path, so as to guide the fruits and vegetables transported by the feed conveyor path into the corresponding sorting channel, thereby avoiding the materials meeting the screening criteria of the sorting channel from being transported to other areas.

[0021] The present application can greatly reduce the probability of missed distribution of fruits and vegetables through the aforementioned method, thereby reducing the probability of mixing, thereby solving the technical problem of low fruit and vegetable sorting quality caused by mixing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model;

[0023] Figure 2 It is a structural schematic diagram of another angle of the overall embodiment of the utility model;

[0024] Figure 3 It is a top view of the overall structure of an embodiment of the utility model.

[0025] Note in the figure:

[0026] 10. Screening platform; 11. First side; 12. Second side; 13. Slide;

[0027] 20. Second roller group;

[0028] 30. Sorting device; 31. First roller group; 32. Material guide plate; 321. Rotating drive member; 33. First baffle plate; 34. Second baffle plate;

[0029] 41. First pillar; 42. Second pillar; 421. Latch. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with the accompanying drawings and specific implementation plans:

[0031] The present embodiment discloses a fruit and vegetable sorting machine with a low error rate, which can be used to sort fruits, vegetables or other crops based on specific screening criteria. Among them, the specific screening criteria can be the appearance standard recognized by the visual recognition module, or the weight standard of the weight recognition module, or the component content standard of the component recognition module (such as the sugar content recognition module), or other standards recognized by other recognition modules. The aforementioned visual recognition module, weight recognition module and component recognition module are all common technologies in the industry, and their working principles and specific structures are not described in detail here. The fruit and vegetable sorting machine with a low error rate of this embodiment can be electrically connected or communicated with the control center of the aforementioned recognition module, and the control center of the recognition module controls the sorting operation of the fruit and vegetable sorting machine based on the recognition signal. Of course, in other embodiments, the fruit and vegetable sorting machine can also be provided with a control unit separately, for example, the control unit can be a common PLC controller, the control unit obtains the recognition signal of the recognition module, and controls the sorting operation of the fruit and vegetable sorting machine based on the recognition signal.

[0032] The fruit and vegetable sorting machine of this embodiment solves the technical problem of low sorting quality in the prior art during the specific sorting operation. The technical solution to the technical problem is as follows:

[0033] See also Figure 1-Figure 3The fruit and vegetable sorting machine of this embodiment includes a screening platform 10, and the top surface of the screening platform 10 is provided with a feed conveyor for conveying fruits and vegetables to be sorted, and two sorting devices 30 respectively arranged on opposite sides of the feed conveyor. Each sorting device 30 corresponds to a screening standard. Exemplarily, the two sorting devices 30 correspond to the two screening standards of large appearance size and small appearance size, respectively. Fruits and vegetables with large appearance size are sorted to a specific area by one of the sorting devices 30, and fruits and vegetables with small appearance size are sorted to another specific area by the other sorting device 30. Fruits and vegetables with unqualified appearance size are further transported forward by the feed conveyor to the special product collection area. Of course, in other embodiments, the two sorting devices 30 can also correspond to other screening standards, such as weight standards, ingredient content standards, etc. One, three, or more sorting devices 30 can be set according to actual needs.

[0034] The sorting device 30 of this embodiment includes a sorting channel and a guide plate 32. The feed port of the sorting channel faces the feed conveying channel. The guide plate 32 is hinged to one side of the feed port and can be switched back and forth between an open state and a closed state by rotating. When the guide plate 32 is in a closed state, the guide plate 32 closes the feed port. When the guide plate 32 is in an open state, the guide plate 32 extends obliquely from one side of the feed conveying channel to the other side opposite to the feed conveying channel relative to the transmission direction of the feed conveying channel, so as to guide the fruits and vegetables transmitted by the feed conveying channel into the sorting channel.

[0035] In one application scenario, when fruits and vegetables do not meet the screening criteria of a certain sorting device 30, when the guide plate 32 of the sorting device 30 is in a closed state, the guide plate 32 closes the feed port, completely preventing fruits and vegetables from entering the corresponding sorting channel from the feed port. This can greatly prevent fruits and vegetables that do not meet the standards from entering the corresponding sorting channel from the feed port. Fruits and vegetables that do not meet the selection criteria continue to be transported forward to another area through the feed conveyor path, or are sorted to other specific areas by another sorting device 30.

[0036] In another application scenario, when fruits and vegetables meet the screening criteria of a certain sorting device 30, the guide plate 32 is in an open state, and the guide plate 32 extends obliquely from one side of the feed conveyor channel to the other side opposite to the feed conveyor channel relative to the transmission direction of the feed conveyor channel, so as to guide the fruits and vegetables transported by the feed conveyor channel into the corresponding sorting channel, thereby preventing materials that meet the screening criteria of the sorting channel from being transported to other areas by the feed conveyor channel or another sorting device 30.

[0037] In another application scenario, when the fruits and vegetables do not meet the screening criteria of the two sorting devices 30, the guide plates 32 of the two sorting devices 30 are in a closed state. At this time, the fruits and vegetables cannot enter the sorting channels of the two sorting devices 30, and can only be transported forward to a specific area by the feed conveyor and treated as defective products.

[0038] Through the operation mode of the aforementioned application scenario, this embodiment can greatly reduce the probability of missed distribution and wrong distribution of fruits and vegetables, thereby reducing the probability of mixing, thereby solving the technical problem of low fruit and vegetable sorting quality caused by mixing.

[0039] Next, the technical solution of the fruit and vegetable sorting machine is further elaborated.

[0040] In this example, see Figure 1 The sorting device 30 includes a first baffle 33, a second baffle 34 and two groups of first roller groups 31. The first baffle 33 and the second baffle 34 are convexly arranged on the top surface of the screening platform 10 at intervals. The two groups of first roller groups 31 are located between the first baffle 33 and the second baffle 34, and the transmission directions of the two groups of first roller groups 31 are the same. The side of the first baffle 33 facing the feed conveyor and the side of the second baffle 34 facing the feed conveyor define the feed port. The fruit and vegetables enter between the first baffle 33 and the second baffle 34 from the feed port, and the positions of the fruits and vegetables are limited by the first baffle 33 and the second baffle 34, ensuring that the fruits and vegetables are transported to the preset position by the first roller group 31. In other embodiments, the number of the first roller group 31 can be set to one group, three groups, or more than three groups according to actual needs.

[0041] In this example, see Figure 1 , a first groove is provided on the top surface of the screening platform 10, and the shape of the first groove matches the shape of the first roller group 31. The first roller group 31 is arranged in the first groove, so that the first roller group 31 can be mostly hidden under the top surface of the screening platform 10, avoiding the obstruction of the first roller group 31 on the fruits and vegetables, making it easier for the fruits and vegetables to pass over the top surface of the first roller group 31 and move forward, and avoiding the fruits and vegetables from being blocked between the first baffle 33 and the second baffle 34. The top surface of the first roller group 31 is exposed outside the notch of the first groove, so that the fruits and vegetables are supported by the top surface of the first roller group 31 and pushed forward. The first roller group 31 includes a plurality of first power rollers arranged in parallel along the transmission direction of the first roller group 31. Among them, the first power roller can be a common power roller on the market, as long as it can push the fruits and vegetables forward. The two ends of the rotating shaft of the first power roller are rotatably inserted into the inner wall of the first groove.

[0042] In this example, see Figure 1The feed conveyor includes a second roller group 20 for conveying fruits and vegetables. The number of the second roller groups 20 can be adaptively changed according to actual needs, such as setting two, three or more parallel groups.

[0043] For further information, see Figure 1 A second groove is provided on the top surface of the screening platform 10, the shape of the second groove is adapted to the shape of the second roller group 20, the second roller group 20 is arranged in the second groove, and the top surface of the second roller group 20 is exposed to the notch of the second groove; the second roller group 20 includes a plurality of second power rollers arranged in parallel along the transmission direction of the second roller group 20.

[0044] In this example, see Figure 3 The screening platform 10 includes a first side edge 11 and a second side edge 12 that are opposite to each other. The first baffle 33 is located between the second roller group 20 and the first side edge 11; specifically, the first baffle 33 is extended along the length direction of the first side edge 11. The second baffle 34 is located between the second roller group 20 and the second side edge 12, and the second baffle 34 is inclined relative to the first baffle 33. The guide plate 32 is hinged to the side of the second baffle 34 facing the feed conveying path, and can rotate around the second baffle 34 to change the guide plate 32 between a closed state and an open state. When the guide plate 32 is in a closed state, the side of the guide plate 32 away from the second baffle 34 abuts against the side of the first baffle 33 facing the feed conveying path.

[0045] In the two sorting devices 30 of this embodiment, when the guide plate 32 of one is in a closed state, the guide plate 32 of the other is in an open state; and the end of the guide plate 32 in the open state abuts against the guide plate 32 in the closed state. At this time, both guide plates 32 can guide the fruits and vegetables. When the guide plates 32 of the sorting device 30 are both in a closed state, the fruits and vegetables are transported forward by the feeding conveyor.

[0046] In this example, see Figure 1 , the height of the first side 11 is higher than the height of the second side 12, and the second roller group 20 is extended from the first side 11 to the second side 12. The first roller group 31 is extended obliquely from one side of the second roller group 20 toward the second side 12. The direction in which the first roller group 31 is extended is parallel to the transmission direction of the first roller group 31, and the direction in which the second roller group 20 is extended is parallel to the transmission direction of the second roller group 20. In the above scheme, the fruits and vegetables on the screening platform 10 can obtain a movement trend of rolling from the first side 11 to the second side 12 under the influence of their own gravity, which plays an effect of assisting the transportation of fruits and vegetables, so that the fruits and vegetables can be more easily transported by the first roller group 31 and the second roller group 20.

[0047] In this embodiment, the relative heights of the first side 11 and the second side 12 can be adjusted in the following manner:

[0048] See also Figure 1 and Figure 2 The bottom surface of the screening platform 10 is provided with a first support group corresponding to the position of the first side 11 and a second support group corresponding to the position of the second side 12; the first support group includes two first pillars 41, and the top of the first pillar 41 is hinged to the screening platform 10. The second support group includes two second pillars 42, and the top height of the second pillar 42 is less than the top height of the first pillar 41. The screening platform 10 is suspended on the ground or the machine table through the two first pillars 41 and the two second pillars 42. The screening platform 10 is also provided with a chute 13 extending from the second side 12 toward the first side 11. The top of the second pillar 42 is slidably connected with the chute 13. Specifically, a latch 421 is provided on the top of the second pillar 42, and the screening platform 10 includes a skirt board extending from the second side 12 toward the first side 11, the chute 13 is opened on the skirt board, and the latch 421 at the top of the second pillar 42 is inserted into the chute 13. On one hand, the second pillar 42 can support the screening platform 10 through the latch 421, and on the other hand, the second pillar 42 is slidably connected with the slide slot 13 through the latch 421. When the top of the second pillar 42 moves along the slide slot 13, the second pillar 42 shifts back and forth between the first side 11 and the second side 12, the height of the second side 12 changes adaptively, and the first side 11 rotates adaptively around the top of the first pillar 41. The relative height of the first side 11 and the second side 12 can be adjusted in the above manner, thereby adjusting the inclination of the screening platform 10.

[0049] In one embodiment, see Figure 2 The bottom surface of the screening platform 10 is provided with a rotary drive member 321, the output shaft of the rotary drive member 321 is connected to the hinge shaft of the guide plate 32, and is used to drive the guide plate 32 to rotate forward and reverse. The rotary drive member 321 can be a servo motor.

[0050] The embodiment disclosed in this specification is only an example of the unilateral features of the utility model, and the protection scope of the utility model is not limited to this embodiment. Any other functionally equivalent embodiments fall within the protection scope of the utility model. For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all these changes and deformations should fall within the protection scope of the claims of the utility model.

Claims

1. A fruit and vegetable sorting machine with low error rate, characterized in that: The invention comprises a screening platform (10), wherein the screening platform (10) is provided with a feed conveying path for conveying fruits and vegetables to be sorted and a sorting device (30); the sorting device (30) comprises a sorting channel and a guide plate (32); the feed inlet of the sorting channel faces the feed conveying path, the guide plate (32) is hinged to one side of the feed inlet and can be switched back and forth between an open state and a closed state by rotation; when the guide plate (32) is in the closed state, the guide plate (32) closes the feed inlet; when the guide plate (32) is in the open state, the guide plate (32) extends obliquely from one side of the feed conveying path to the other side opposite to the feed conveying path relative to the conveying direction of the feed conveying path, so as to guide the fruits and vegetables transported by the feed conveying path into the sorting channel.

2. The fruit and vegetable sorting machine with low error rate as claimed in claim 1, characterized in that: The number of the sorting devices (30) configured is two, and the two sorting devices (30) are respectively arranged on opposite sides of the feed conveying path.

3. The fruit and vegetable sorting machine with low error rate as claimed in claim 2, characterized in that: In the two sorting devices (30), when the material guide plate (32) of one is in a closed state and the material guide plate (32) of the other is in an open state, the end of the material guide plate (32) in the open state abuts against the material guide plate (32) in the closed state; when the material guide plates (32) of the sorting devices (30) are both in a closed state, the fruits and vegetables are transported forward by the feed conveying path.

4. The fruit and vegetable sorting machine with low error rate as claimed in claim 3, characterized in that: The sorting device (30) comprises a first baffle (33) and a second baffle (34); the first baffle (33) and the second baffle (34) are protruded from the screening platform (10) at an interval; a side of the first baffle (33) facing the feed conveying path and a side of the second baffle (34) facing the feed conveying path define the feed port.

5. The fruit and vegetable sorting machine with low error rate as claimed in claim 4, characterized in that: The sorting device (30) further comprises at least one first roller group (31) for conveying fruits and vegetables, wherein the first roller group (31) is located between the first baffle plate (33) and the second baffle plate (34).

6. The fruit and vegetable sorting machine with low error rate as claimed in claim 5, characterized in that: The feed conveyor comprises a second roller group (20) for conveying fruits and vegetables; the screening platform (10) comprises a first side edge (11) and a second side edge (12) opposite to each other; the second roller group (20) is extended from the first side edge (11) to the second side edge (12); the first roller group (31) is obliquely extended from one side of the second roller group (20) toward the second side edge (12); the direction in which the first roller group (31) is extended is parallel to the conveying direction of the first roller group (31); and the direction in which the second roller group (20) is extended is parallel to the conveying direction of the second roller group (20).

7. The fruit and vegetable sorting machine with low error rate as claimed in claim 6, characterized in that: The top surface of the screening platform (10) is provided with a first groove, the shape of the first groove being compatible with the shape of the first roller group (31); the first roller group (31) is arranged in the first groove, and the top surface of the first roller group (31) is exposed outside the notch of the first groove; the first roller group (31) includes a plurality of first power rollers arranged in parallel along the transmission direction of the first roller group (31); the top surface of the screening platform (10) is provided with a second groove, the shape of the second groove being compatible with the shape of the second roller group (20); the second roller group (20) is arranged in the second groove, and the top surface of the second roller group (20) is exposed outside the notch of the second groove; the second roller group (20) includes a plurality of second power rollers arranged in parallel along the transmission direction of the second roller group (20).

8. The fruit and vegetable sorting machine with low error rate as claimed in claim 6, characterized in that: The first baffle (33) is located between the second roller group (20) and the first side edge (11); the second baffle (34) is located between the second roller group (20) and the second side edge (12); the material guide plate (32) is hinged to a side of the second baffle (34) facing the feed conveying path; when the material guide plate (32) is in a closed state, a side of the material guide plate (32) away from the second baffle (34) abuts against a side of the first baffle (33) facing the feed conveying path.

9. The fruit and vegetable sorting machine with low error rate as claimed in claim 8, characterized in that: The height of the first side (11) is higher than the height of the second side (12); the bottom surface of the screening platform (10) is provided with a first support group corresponding to the position of the first side (11) and a second support group corresponding to the position of the second side (12); the first support group includes at least one first pillar (41), the top of which is hinged to the screening platform (10); the second support group includes at least one second pillar (42), the top height of the second pillar (42) is less than the top height of the first pillar (41); the screening platform (10) is also provided with a slide groove (13) extending from the second side (12) toward the first side (11); the top of the second pillar (42) is slidably connected to the slide groove (13), and when the top of the second pillar (42) moves along the slide groove (13), the height of the second side (12) changes adaptively.

10. The fruit and vegetable sorting machine with low error rate according to any one of claims 1 to 9, characterized in that: A rotary drive member (321) is provided on the bottom surface of the screening platform (10), and an output shaft of the rotary drive member (321) is connected to a hinge shaft of the material guide plate (32) to drive the material guide plate (32) to rotate forward and reverse.