A detection and sorting device for imperfect grains

Abstract

This invention relates to a detection and sorting device for imperfect grain grains, comprising: a working platform with a camera aperture; a receiving tray, which is a transparent tray horizontally positioned above the camera aperture; a moving mechanism connected to the receiving tray for driving the tray to move to any position above the camera aperture; a hopper, the bottom of which is mounted on the upper part of the working platform via a vibration mechanism and located on one side of the receiving tray; a discharge chute, one end of which is connected to and communicates with the discharge port of the hopper, and the other end of which extends above the receiving tray; and a machine vision system with two camera modules fixed above and below the camera aperture, both pointing vertically towards the receiving tray, for jointly capturing images of the top and bottom surfaces of individual grain grains on the receiving tray. Advantages: Facilitates the orderly arrangement of grain grains on the receiving tray during the detection process, thus aiding in the review of detection results and enabling counting.

Description

Technical Field

[0001] The invention relates to the technical field of grain detection, and in particular to a detection and sorting device for imperfect grains. Background Art

[0002] Imperfect grains refer to grains that are damaged but still have edible value, including insect-damaged grains, diseased grains, broken grains, immature grains, sprouted grains and moldy grains. Imperfect grains are easily produced during the production, storage, packaging and transportation of grains, which seriously affect the quality and safety of grains. By detecting imperfect grains of grains, we can not only reasonably check the overall quality of grains, but also improve all aspects involved in the grain industry. At present, most of the quality inspections of grains are mainly manual, the speed of manual inspection is relatively slow, and the quality results of the inspections are very subjective. At this stage, there are some detection methods: acoustic signal detection of imperfect grains of grains. This method is to detect the acoustic signals generated by the collision of imperfect grains through the changes in the physical structure of imperfect grains relative to perfect grains. When collecting acoustic signals, noise interference cannot be avoided, which affects the detection; near-infrared spectroscopy can also detect imperfect grains of grains. When using this method for detection, the humidity and temperature of different samples will affect the inspection results.

[0003] In recent years, some teams have used computer vision technology and artificial intelligence methods to detect imperfect grains, but the results are not ideal and lack application conditions. Most existing detection methods use acquisition equipment to take photos of the upper and lower surfaces of imperfect grain grains, process the collected images, and then use relevant algorithms for analysis. This method generally spreads grains on the receiving tray and takes scanning photos, which is not conducive to the counting work of grain detection. In addition, once a problem occurs in the detection, it is difficult to trace the detection situation, which directly affects the detection results. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a detection and sorting device for imperfect grains of grains, which effectively overcomes the defects of the prior art.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] A detection and sorting device for imperfect grains of grains, comprising a working platform, with a shooting hole provided on the working platform; a receiving tray, which is a transparent tray and is horizontally arranged above the shooting hole; a moving mechanism, which is transmission-connected to the receiving tray and is used to drive the receiving tray to move to any position above the shooting hole; a hopper, with the bottom of the hopper installed on the upper end of the working platform through a vibration mechanism and located on one side of the receiving tray; a discharge chute, with one end of the discharge chute connected and communicated with the discharge port of the hopper, and the other end extending to above the receiving tray; a machine vision system, which has two camera modules, which are respectively fixed above and below the shooting hole, and the shooting directions are both vertically toward the receiving tray, and are used to jointly capture the upper and lower surface appearance images of single grains on the receiving tray, and identify whether the detected grains are perfect grains.

[0007] Based on the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, the above-mentioned moving mechanism includes a longitudinal moving module, a transverse moving module and a frame. The above-mentioned material receiving tray is a rectangular tray. The above-mentioned frame is adapted to the shape of the above-mentioned material receiving tray and is horizontally arranged below the above-mentioned material receiving tray. The above-mentioned transverse moving module is installed on the above-mentioned frame and is transmission-connected to the lower end of the above-mentioned material receiving tray for driving the above-mentioned material receiving tray to move in a straight line toward its two ends. The above-mentioned longitudinal moving module is installed on the upper end of the above-mentioned working platform and is transmission-connected to the above-mentioned frame for driving the above-mentioned frame to move in a straight line toward its two ends.

[0009] Furthermore, the above-mentioned longitudinal moving module includes a first linear guide rail and a first track, and the above-mentioned first linear guide rail and the first track are respectively installed on the upper end of the above-mentioned working platform and located on both sides of the above-mentioned shooting hole, and the length directions of the two extend along the two ends of the above-mentioned receiving tray; the lower ends of both sides of the above-mentioned frame are respectively connected to the moving actuator of the above-mentioned first linear guide rail and the slider on the above-mentioned first track.

[0010] Furthermore, the above-mentioned lateral moving module includes two second linear guide rails, the length directions of the two second linear guide rails extend along the two sides of the above-mentioned receiving tray respectively, and the two are respectively installed on the upper ends of the frame bars at both ends of the above-mentioned frame, and the lower ends of the two ends of the above-mentioned receiving tray are respectively connected to the moving actuators of the two second linear guide rails.

[0011] Furthermore, one end of the discharge chute away from the hopper extends obliquely downward to approach the upper surface of the receiving tray.

[0012] Furthermore, at the upper edges of both ends of the above-mentioned receiving tray, there are vertically provided with ribs extending toward both sides thereof along the edge lines, and the outsides of the above-mentioned ribs on both sides are respectively provided with transverse movement mechanisms, and a strip-shaped pushing plate in contact with the upper surface of the above-mentioned receiving tray is provided between the above-mentioned ribs on both sides, and the two ends of the above-mentioned pushing plate are respectively transmission connected with the two above-mentioned transverse movement mechanisms, and the two above-mentioned transverse movement mechanisms are used to synchronously drive the above-mentioned pushing plate to move along the surface of the above-mentioned receiving tray between its two side edges, and the lower end height of the other end of the above-mentioned discharge trough is higher than the upper end height of the above-mentioned pushing plate.

[0013] Furthermore, it also includes a material receiving box, which is arranged on the other side of the material receiving tray, and its upper end is open. The interior of the material receiving box is provided with multiple independent material receiving cavities along the extension direction of the two ends of the material receiving tray, and the bottom of the material receiving box is provided with an electronic weighing device connected to the above-mentioned machine vision system.

[0014] Furthermore, the above-mentioned transverse movement mechanism is a belt conveying mechanism, and the two ends of the above-mentioned push plate are respectively connected to the belts of the two above-mentioned belt conveying mechanisms.

[0015] Furthermore, it also includes a photoelectric sensor connected to the above-mentioned machine vision system, and the transmitting end and the receiving end of the above-mentioned photoelectric sensor are respectively arranged above the two ends of the above-mentioned receiving tray and correspond to the other end of the above-mentioned discharge chute, for detecting the falling material information at the other end of the discharge chute.

[0016] Furthermore, fill light sources are respectively provided on the peripheries of the lenses of the two camera modules.

[0017] The beneficial effects of the present invention are as follows: the grain detection process is facilitated to be arranged in an orderly manner on the receiving plate, thereby facilitating the backtracking of the detection situation and enabling detection and counting. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the results of the detection and sorting equipment for imperfect grains of grains of the present invention.

[0019] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0020] 1. Working platform; 2. Receiving tray; 3. Moving mechanism; 4. Hopper; 5. Vibrating mechanism; 6. Discharging chute; 8. Camera module; 9. Receiving box; 11. Shooting hole; 21. Side guard; 22. Transverse mechanism; 23. Pushing plate; 31. Frame; 32. First linear guide rail; 33. First track; 34. Second linear guide rail; 81. Fill light source. DETAILED DESCRIPTION

[0021] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0022] Example: Figure 1 As shown, the detection and sorting equipment for imperfect grains of grain in this embodiment includes a working platform 1, on which a shooting hole 11 is provided; a receiving tray 2, which is a transparent tray and is horizontally arranged above the shooting hole 11; a moving mechanism 3, which is transmission-connected with the receiving tray 2 and is used to drive the receiving tray 2 to move to any position above the shooting hole 11; a hopper 4, the bottom of which is installed on the upper end of the working platform 1 through a vibration mechanism 5 and is located on one side of the receiving tray 2; a discharge chute 6, one end of which is connected and communicated with the discharge port of the hopper 4, and the other end of which extends to the top of the receiving tray 2; a machine vision system, which has two camera modules 8, which are respectively fixed above and below the shooting hole 11, and the shooting directions are vertically toward the receiving tray 2, for jointly photographing the upper and lower surface appearance images of single grains on the receiving tray 2, and identifying whether the detected grains are perfect grains.

[0023] The detection process is as follows:

[0024] The grain to be tested is put into the hopper 4, and under the vibration of the vibration mechanism 5, it enters the discharge trough 6 in a row and falls one by one at the other end of the discharge trough 6. Taking this embodiment as an example, an array type is adopted to drop the grain on the receiving tray 2, specifically: before starting the test, the other end of the receiving tray 2 is moved to the top of the shooting hole 11 by the moving mechanism 3. After dropping the grain here, the receiving tray 2 is quickly controlled by the moving mechanism 3 to move horizontally to one end of it by a certain distance (column spacing) to drop the grain again until the grain falls in a row. After one row is completed, the moving mechanism 3 controls the receiving tray 2 to move horizontally to the other side by a certain distance (row spacing). In this way, according to the above method, By controlling the movement of the receiving tray 2 (circumventing movement), the grains are dropped onto the receiving tray in an array. After each dropping, the machine vision system controls the upper and lower camera modules 8 to shoot the upper and lower surfaces of the grains before the receiving tray 2 moves, and feeds back image information. When the receiving tray 2 is filled with materials in rows and columns, one inspection is completed, and the grains on the receiving tray 2 are collected in rows (each row is collected in a container) to facilitate data traceability (if there is a problem with the inspection of a row or column, only the grains in that row need to be re-inspected). In addition, during the inspection process, since single grains are inspected one by one, technical statistics of the grains can be facilitated.

[0025] It should be noted that the arrangement of the grains on the receiving tray 2 is approximately an array, because after the grains fall on the receiving tray 2, there will be a small rebound position deviation, but the deviation is controllable and small, and does not affect the normal arrangement, photography and tracing of the grains.

[0026] As a preferred embodiment, the moving mechanism 3 includes a longitudinal moving module, a transverse moving module and a frame 31. The receiving tray 2 is a rectangular tray. The frame 31 is adapted to the shape of the receiving tray 2 and is horizontally arranged below the receiving tray 2. The transverse moving module is installed on the frame 31 and is transmission-connected to the lower end of the receiving tray 2 for driving the receiving tray 2 to move in a straight line toward its two ends. The longitudinal moving module is installed on the upper end of the working platform 1 and is transmission-connected to the frame 31 for driving the frame 31 to move in a straight line toward its two ends.

[0027] In this embodiment, the frame 31 is always located outside the shooting hole 11 during the movement, and the two-dimensional movement of the receiving tray 2 is realized by moving in two directions, ensuring that any position of the receiving tray 2 can be moved above the shooting hole 11, which is beneficial to the effective photography and detection of grain grains.

[0028] As a preferred embodiment, the above-mentioned longitudinal moving module includes a first linear guide rail 32 and a first track 33, and the above-mentioned first linear guide rail 32 and the first track 33 are respectively installed on the upper end of the above-mentioned working platform 1, and are located on both sides of the above-mentioned shooting hole 11, and the length directions of both extend along the two ends of the above-mentioned receiving tray 2; the lower ends of both sides of the above-mentioned frame 31 are respectively connected to the moving actuator of the above-mentioned first linear guide rail 32 and the slider on the above-mentioned first track 33.

[0029] In this embodiment, the longitudinal moving module adopts the linear guide rail of the existing technology, which is relatively mature in technology, has relatively stable movement, good performance, and is easy to smoothly move the receiving tray 2 to receive the materials.

[0030] As a preferred embodiment, the above-mentioned lateral moving module includes two second linear guide rails 34, the length directions of the two second linear guide rails 34 extend along the two sides of the above-mentioned receiving tray 2 respectively, and the two are respectively installed on the upper ends of the frame bars at both ends of the above-mentioned frame 31, and the lower ends of the two ends of the above-mentioned receiving tray 2 are respectively connected to the moving actuators of the two second linear guide rails 34.

[0031] In this embodiment, the lateral moving module adopts the linear guide rail of the prior art, which is relatively mature in technology, has relatively stable movement, good performance, and is easy to smoothly move the receiving tray 2 to receive the materials.

[0032] As a preferred embodiment, one end of the discharge chute 6 away from the hopper 4 extends obliquely downward to approach the upper surface of the receiving tray 2 .

[0033] In this embodiment, the distance between the other end of the discharge chute 6 and the upper surface of the receiving tray 2 is shortened by the downwardly inclined extension portion, thereby reducing the rebound of the grains after falling on the surface of the receiving tray 2.

[0034] Specifically, the discharge chute 6 is generally arranged horizontally or tilted downward, which is conducive to the smooth discharge of grains.

[0035] The groove type of the above-mentioned discharge groove 6 can have various shapes according to different types of grains, such as U-shaped cross-section (the bottom wall is straight or arc-shaped and concave downward), V-shaped cross-section, inverted trapezoidal cross-section, etc.

[0036] As a preferred embodiment, at the upper edges of both ends of the above-mentioned receiving tray 2, there are vertically provided with ribs extending toward both sides along the edge lines thereof, and the outsides of the above-mentioned ribs on both sides are respectively provided with transverse movement mechanisms 22, and between the above-mentioned ribs on both sides is provided a strip-shaped pushing plate 23 in contact with the upper surface of the above-mentioned receiving tray 2, and the two ends of the above-mentioned pushing plate 23 are respectively transmission connected with the two above-mentioned transverse movement mechanisms 22, and the two above-mentioned transverse movement mechanisms 22 are used to synchronously drive the above-mentioned pushing plate 23 to move along the surface of the above-mentioned receiving tray 2 between its two side edges, and the lower end height of the other end of the above-mentioned discharge trough 6 is higher than the upper end height of the above-mentioned pushing plate 23.

[0037] In this embodiment, a pushing plate 23 and a transverse movement mechanism 22 are provided on the receiving tray 2, so that after the receiving tray 2 is filled with grains, the pushing plate 23 is driven by the transverse movement mechanism 22 to move from one side of the receiving tray 2 to the other side, thereby pushing the grain away from the receiving tray 2, thereby realizing automatic collection.

[0038] Preferably, it also includes a material receiving box 9, which is arranged on the other side of the material receiving tray 2, with an open upper end, and the interior of the material receiving box 9 is provided with a plurality of independent material receiving cavities along the extension direction of the two ends of the material receiving tray 2, and an electronic weighing device connected to the machine vision system is provided at the bottom of the material receiving box 9.

[0039] In this embodiment, the multiple independent material receiving cavities in the material receiving box 9 are designed to adapt to the multiple grains in each column (that is, the number of material receiving cavities corresponds to the number of each column of grains arranged in an array on the material receiving tray 2). The center distance between two adjacent material receiving cavities is roughly the same as the distance between two adjacent rows of grain grains on the material receiving tray 2. After the detection is completed, each row of grain can be pushed into the corresponding material receiving cavity through the pushing of the pushing plate 23 of the transverse movement mechanism 22, which is convenient for subsequent data tracing.

[0040] As a preferred embodiment, the transverse movement mechanism 22 is a belt conveyor mechanism, and both ends of the push plate 23 are respectively connected to the belts of the two belt conveyor mechanisms.

[0041] In this embodiment, the belt conveyor mechanism is a prior art, which can drive the push plate 23 to move stably and horizontally to push the material.

[0042] As a preferred embodiment, it also includes a photoelectric sensor connected to the above-mentioned machine vision system, and the transmitting end and the receiving end of the above-mentioned photoelectric sensor are respectively arranged above the two ends of the above-mentioned receiving tray 2, and correspond to the other end of the above-mentioned discharge chute 6, for detecting the falling material information at the other end of the discharge chute 6.

[0043] In this embodiment, the design function of the photoelectric sensor is that when grains fall from the other end of the discharge chute 6, it will be sensed by the photoelectric sensor and fed back to the machine vision system. The machine vision system then simultaneously controls the two camera modules 8 to simultaneously capture the upper and lower surface shape image information of the fallen grains.

[0044] Preferably, fill light sources 81 are respectively provided on the peripheries of the lenses of the two camera modules 8 .

[0045] In this solution, the fill light source 81 is used to enhance the illumination at the corresponding shooting holes 11 on the upper and lower sides of the receiving tray 2, ensuring that the two camera modules 8 can clearly take pictures and identify single grains of food.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A detection and sorting device for imperfect grains, characterized in that: include: A working platform (1), wherein the working platform (1) is provided with a shooting hole (11); A material receiving tray (2), the material receiving tray (2) being a transparent tray and being arranged horizontally above the shooting hole (11); A moving mechanism (3), the moving mechanism (3) being in driving connection with the material receiving tray (2) and being used for driving the material receiving tray (2) to move to any position above the shooting hole (11); A hopper (4), the bottom of which is mounted on the upper end of the working platform (1) via a vibration mechanism (5) and is located on one side of the receiving tray (2); A discharge chute (6), one end of which is connected to and communicates with the discharge port of the hopper (4), and the other end of which extends to above the receiving tray (2); A machine vision system, the machine vision system comprising two camera modules (8), the two camera modules (8) being fixed respectively at the upper and lower parts of the shooting hole (11), and the shooting directions both being vertically oriented toward the receiving tray (2), for jointly shooting upper and lower surface appearance images of single grains on the receiving tray (2); when the receiving tray (2) is filled with materials in rows and columns, a detection work is completed, the grains on the receiving tray (2) are collected in rows, and the detected grains are identified as perfect grains; The moving mechanism (3) comprises a longitudinal moving module, a transverse moving module and a frame (31); the receiving tray (2) is a rectangular tray; the frame (31) is adapted to the shape of the receiving tray (2) and is horizontally arranged below the receiving tray (2); the transverse moving module is mounted on the frame (31) and is transmission-connected to the lower end of the receiving tray (2) for driving the receiving tray (2) to move linearly toward its two ends; the longitudinal moving module is mounted on the upper end of the working platform (1) and is transmission-connected to the frame (31) for driving the frame (31) to move linearly toward its two ends; the end of the discharge chute (6) away from the hopper (4) extends obliquely downward close to the upper surface of the receiving tray (2); the upper edges of the two ends of the receiving tray (2) are respectively provided with retaining edges extending toward both sides thereof along their edge lines, and the outer sides of the retaining edges on both sides are respectively provided with transverse moving mechanisms (22) A strip-shaped push plate (23) in contact with the upper surface of the receiving tray (2) is provided between the two side retaining edges, and the two ends of the push plate (23) are respectively connected to the two transverse movement mechanisms (22) in a transmission manner. The two transverse movement mechanisms (22) are used to synchronously drive the push plate (23) to move along the surface of the receiving tray (2) between its two side edges, and the lower end height of the other end of the discharge trough (6) is higher than the upper end height of the push plate (23); it also includes a receiving box (9), the receiving box (9) is arranged on the other side of the receiving tray (2), and its upper end is open. The interior of the receiving box (9) is provided with a plurality of independent receiving cavities along the extending direction of the two ends of the receiving tray (2), and the bottom of the receiving box (9) is provided with an electronic weighing device connected to the machine vision system; the transverse movement mechanism (22) is a belt conveyor mechanism, and the two ends of the push plate (23) are respectively connected to the belts of the two belt conveyors.

2. The detection and sorting device for imperfect grains of grain according to claim 1 is characterized by: The longitudinal moving module comprises a first linear guide rail (32) and a first track (33), the first linear guide rail (32) and the first track (33) being respectively mounted on the upper end of the working platform (1) and located on both sides of the shooting hole (11), and the length directions of the two extend along both ends of the receiving tray (2); the lower ends of both sides of the frame (31) are respectively connected to the moving actuator of the first linear guide rail (32) and the slider on the first track (33).

3. The detection and sorting device for imperfect grains of food according to claim 1 is characterized by: The transverse moving module comprises two second linear guide rails (34), the length directions of the two second linear guide rails (34) respectively extending along the two sides of the receiving tray (2), and the two are respectively mounted on the upper ends of the frame bars at both ends of the frame (31), and the lower ends of both ends of the receiving tray (2) are respectively connected to the moving actuators of the two second linear guide rails (34).

4. A detection and sorting device for imperfect grains according to any one of claims 1 to 3, characterized in that: It also includes a photoelectric sensor connected to the machine vision system, wherein the transmitting end and the receiving end of the photoelectric sensor are respectively arranged above the two ends of the receiving tray (2) and correspond to the other end of the discharge trough (6), and are used to detect the falling material information at the other end of the discharge trough (6).

5. A detection and sorting device for imperfect grains according to any one of claims 1 to 3, characterized in that: Filling light sources (81) are respectively provided on the peripheries of the lenses of the two camera modules (8).

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