A machine vision detection and screening device

Abstract

The present invention relates to the technical field of product inspection and screening, and in particular to a machine vision inspection and screening device; comprising: an inspection box; the bottom of the inspection box is fixedly connected to the top of a base, and avoidance grooves are arranged on both sides of the inspection box; a conveyor belt; the conveyor belt passes through the avoidance grooves on both sides of the inspection box and is towed and supported by a traction component; a camera component; the camera component is located inside the inspection box and is used to photograph workpieces on the conveyor belt; a screening component; the screening component is located on one side of the inspection box and is used to remove unqualified workpieces after inspection; the present invention irradiates the transparent workpiece from the inside to the outside, so that the details and features inside the cup can be observed more clearly, and the reflection disturbance caused by irradiating from the outside to the inside can be reduced, which makes the inspection result more accurate and makes it easier to identify the flaws or defects on the surface of the cup.

Description

Technical Field

[0001] The invention relates to the technical field of product detection and screening, in particular to a machine vision detection and screening device. Background Art

[0002] The words on glass containers are usually printed by screen printing. Screen printing is a common glass container printing technology that uses special inks or pigments to transfer the designed words or patterns to the surface of the glass container. After the words are printed on the surface of the glass container, the printed glass container will be inspected by machine vision and the defective products will be removed by the screening device.

[0003] When a machine visually inspects writing on the surface of a glass container, the surface of the glass container is generally supplemented with light from the outside of the glass container. However, in actual use, when the external light source shines into the cup, it may produce strong reflected light, which interferes with the visual inspection process and reduces the accuracy of the inspection.

[0004] In view of this, in order to overcome the above technical problems, the present invention proposes a machine vision detection and screening device to solve the above technical problems. Summary of the invention

[0005] In order to make up for the shortcomings of the prior art, the present invention proposes a machine vision inspection and screening device. By irradiating the transparent workpiece from the inside to the outside, the present invention can more clearly observe the details and features inside the cup, and can reduce the reflection disturbance caused by irradiating from the outside to the inside, which makes the detection result more accurate and can more easily identify the flaws or defects on the surface of the cup.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a machine vision detection and screening device described in the present invention comprises:

[0007] Detection box; the bottom of the detection box is fixedly connected to the top of the base, and avoidance grooves are provided on both sides of the detection box;

[0008] Conveyor belt; the conveyor belt passes through the avoidance grooves on both sides of the detection box and is pulled and supported by the pulling assembly; the conveyor belt is used to convey equidistant workpieces;

[0009] A camera assembly; the camera assembly is located inside the detection box and is used to photograph the workpiece on the conveyor belt;

[0010] Screening assembly; the screening assembly is located on one side of the detection box and is used to remove unqualified workpieces after detection; the screening assembly includes a collection box, a column and an electric push rod; the collection box and the column are respectively located on both sides of the conveyor belt; the side of the column close to the collection box is fixedly connected to the electric push rod, and the end of the electric stew pot push rod is fixedly connected to the push plate;

[0011] Controller; the controller is used to control the automatic operation of the detection and screening device;

[0012] The detection and screening device also includes:

[0013] Circulating belt; the circulating belt is located inside the detection box and below the conveyor belt;

[0014] Light sticks; the light sticks are fixedly connected to the outer surface of the circulating belt at equal distances;

[0015] Through hole; the through hole is arranged on the conveyor belt; the distance between two adjacent through holes is equal to the straight-line distance between adjacent lamp bars.

[0016] Preferably, rollers are provided on the inner side of the circulating belt; there are at least four rollers, which stretch the circulating belt into an isosceles trapezoidal shape; the circulating belt is composed of a top edge, an inclined surface and a bottom edge under the action of the rollers; the outer wall of the detection box is fixedly connected to the motor; the motor output shaft is fixedly connected to one end of one of the rollers; the lamp stick is hinged to the surface of the circulating belt through a base block; the end of the lamp stick away from the corresponding base block is connected to magnet No. 1; magnet No. 2 is fixedly connected to the top of the detection box; magnet No. 1 and magnet No. 2 are magnetically attracted to each other.

[0017] Preferably, a ring strip is fixedly connected to the middle part of the outer surface of the circulating belt; the ring strip and the circulating belt are both elastic; a slide groove is provided on the side of the base block away from the lamp rod; the slide groove is connected to both sides of the base block; the width of the slide groove is equal to that of the ring strip; a threaded hole is provided on one of the groove walls of the slide groove; a bolt is connected to the inner thread of the threaded hole; and there are multiple through holes.

[0018] Preferably, the outer wall of one end of the lamp rod away from the base block is fixedly connected to a scraper; and the edge of the scraper away from the lamp rod is adapted to the inner wall of the workpiece.

[0019] Preferably, the scraper is provided with a pressure relief groove running through the upper and lower parts; the lower groove of the pressure relief groove is hingedly connected to the cover plate; and the light rod of the cover plate covers the pressure relief groove when it is moved out of the inner side of the workpiece.

[0020] Preferably, the cover plate is hinged to the lower notch of the pressure relief groove by a torsion spring; the torsion force of the torsion spring is smaller than the gravity of the workpiece; the cover plate overcomes the torsion force of the torsion spring and opens the lower notch of the pressure relief groove when the lamp rod enters the inner side of the workpiece.

[0021] Preferably, the scraper is made of an elastic material, such as rubber; the edge of the scraper is bent upward; and the scraper is compressed and expanded during the upward movement to contact the inner wall of the workpiece.

[0022] Preferably, the position where the cover plate is hinged to the lower notch of the pressure relief groove is arranged close to the corresponding lamp rod; the cover plate guides the airflow discharged from the pressure relief groove to the inner wall of the workpiece.

[0023] Preferably, the magnetic force between the second magnet and the first magnet is greater than the gravity of the lamp rod on the bottom edge of the circulating belt.

[0024] The beneficial effects of the present invention are as follows:

[0025] 1. By irradiating the transparent workpiece from the inside to the outside, the present invention can more clearly observe the details and features inside the cup compared to the original irradiation from the outside to the inside, and can reduce the reflection disturbance caused by irradiation from the outside to the inside, which makes the detection result more accurate and can more easily identify the flaws or defects on the surface of the cup.

[0026] 2. The present invention uses the magnetic force of magnet No. 2 to attract magnet No. 1, so that the two inclined surfaces and the top edge of the lamp stick on the circulating belt are vertical, so that the lamp stick can enter the through hole in a vertical state and move out of the through hole in a vertical state, avoiding interference caused by the lamp stick in a tilted state entering or moving out of the through hole, and greatly improving the stability of the lamp stick entering the inner side of the glass.

[0027] 3. In the present invention, the upper chamber gradually decreases as the scraper moves upward, and the pressure of the gas in the upper chamber increases under the pressure, so that the gas in the upper chamber pushes the cover plate open and flows into the lower chamber along the pressure relief groove, reducing the air pressure resistance caused by the operation of the scraper and preventing the glass cup from tipping over or shifting under the resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention is further described below in conjunction with the accompanying drawings and implementation modes.

[0029] Figure 1 is a stereogram of the present invention;

[0030] Figure 2 is a cross-sectional view of the present invention;

[0031] Figure 3 is a three-dimensional cross-sectional view of the present invention at another angle;

[0032] Figure 4 It is a three-dimensional diagram of the circulating belt and the endless strip in the present invention;

[0033] Figure 5 It is a connection diagram of the base block and the ring strip in the present invention;

[0034] Figure 6 is a connection position diagram of the torsion spring in the present invention;

[0035] Figure 7 This is a diagram of the scraper in the present invention moving upward in the workpiece;

[0036] Figure 8 This is a diagram of the scraper in the present invention moving downward in the workpiece.

[0037] In the figure: detection box 1, base 11, avoidance groove 12, motor 13, No. 2 magnet 14, conveyor belt 2, through hole 21, camera assembly 3, screening assembly 4, collection box 41, column 42, electric push rod 43, circulating belt 5, roller 51, ring strip 52, light stick 6, base block 61, No. 1 magnet 62, slide groove 63, threaded hole 64, bolt 65, scraper 7, pressure relief groove 71, cover plate 72, torsion spring 73. DETAILED DESCRIPTION

[0038] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0039] like Figures 1 to 8 As shown, a machine vision detection and screening device according to the present invention comprises:

[0040] Detection box 1; the bottom of the detection box 1 is fixedly connected to the top of the base 11, and avoidance grooves 12 are provided on both sides of the detection box 1;

[0041] Conveyor belt 2; the conveyor belt 2 passes through the avoidance grooves 12 on both sides of the detection box 1 and is pulled and supported by the pulling assembly; the conveyor belt 2 is used to convey equidistant workpieces;

[0042] Camera assembly 3; the camera assembly 3 is located inside the detection box 1 and is used to photograph the workpiece on the conveyor belt 2;

[0043] Screening assembly 4; the screening assembly 4 is located on one side of the detection box 1, and is used to remove unqualified workpieces after detection; the screening assembly 4 includes a collection box 41, a column 42 and an electric push rod 43; the collection box 41 and the column 42 are respectively located on both sides of the conveyor belt 2; the side of the column 42 close to the collection box 41 is fixedly connected to the electric push rod 43, and the end of the electric stew pot push rod is fixedly connected to the push plate;

[0044] Controller; the controller is used to control the automatic operation of the detection and screening device;

[0045] The detection and screening device also includes:

[0046] Circulating belt 5; the circulating belt 5 is located inside the detection box 1 and below the conveyor belt 2;

[0047] Light rods 6; the light rods 6 are fixedly connected to the outer surface of the circulating belt 5 at equal distances;

[0048] Through hole 21; the through hole 21 is arranged on the conveyor belt 2; the distance between two adjacent through holes 21 is equal to the straight-line distance between adjacent light bars 6;

[0049] When the machine is visually inspecting the writing on the surface of the glass container, it will usually use the external light source of the glass container to supplement the surface of the glass container. However, in actual use, when the external light source shines into the cup, it may generate strong reflected light, which will interfere with the visual inspection process and reduce the accuracy of the inspection.

[0050] Therefore, the staff of the present invention controls the traction component to pull and support the movement of the conveyor belt 2 through a controller. While the conveyor belt 2 is moving, it will drive the workpiece placed on the upper end to move synchronously. Taking a glass cup as an example of the workpiece of the present application, the glass cup with words is inverted and stuck on the conveyor belt 2 and is located directly above the through hole 21. When the conveyor belt 2 is conveying the glass cup to move at the upper end of the conveyor belt 2, the controller will control the transmission of the circulating belt 5. During the transmission of the circulating belt 5, the lamp stick 6 will be driven to move accordingly. After the movement, the lamp stick 6 will gradually insert into the through hole 21 from bottom to top and move to the inner side of the glass cup. The lamp stick 6 will emit a light source on the inner side of the glass cup. The camera assembly 3 around the glass cup will photograph the luminous glass, and the accuracy and completeness of the font on the glass cup will be recognized by the controller. As the conveyor belt 2 and the circulating belt 5 continue to move, the lamp stick 6 gradually moves from top to bottom under the action of the circulating belt 5. Gradually move out from the inside of the through hole 21, and with the circular transmission of the circulating belt 5, the light rod 6 will be inserted into the corresponding through hole 21 to illuminate the inside of the glass. The glass is transparent. When the light is irradiated from the inside of the cup to the outside, the details and features of the inside of the cup can be observed more clearly, including foreign matter, bubbles or other poor quality problems; when the light is irradiated from the inside to the outside, interference factors such as reflection disturbance of the external environment can be reduced, which makes the detection result more accurate and can more easily identify flaws or defects on the surface of the cup; after the controller analyzes and detects that the font on a certain glass is unqualified or inaccurate, the electric push rod 43 in the screening component 4 will push the push plate close to the unqualified glass, so that the unqualified glass is pushed into the collection box 41 by the electric push rod 43, and the glass is recycled, that is, the visual inspection and screening process of the workpiece is completed;

[0051] By irradiating the transparent workpiece from the inside to the outside, the present invention can more clearly observe the details and features inside the cup compared to the original irradiation from the outside to the inside, and can reduce the reflection disturbance caused by irradiation from the outside to the inside, which makes the detection result more accurate and can more easily identify the flaws or defects on the surface of the cup.

[0052] As an embodiment of the present invention, a roller 51 is provided inside the circulating belt 5; there are at least four rollers 51, and the circulating belt 5 is stretched out to form an isosceles trapezoid; the circulating belt 5 is composed of a top edge, an inclined surface and a bottom edge under the action of the rollers 51; the outer wall of the detection box 1 is fixedly connected to the motor 13; the output shaft of the motor 13 is fixedly connected to one end of one of the rollers 51; the lamp stick 6 is hinged to the surface of the circulating belt 5 through the base block 61; the end of the lamp stick 6 away from the corresponding base block 61 is connected to the first magnet 62; the top of the detection box 1 is fixedly connected to the second magnet 14; the first magnet 62 and the second magnet 14 are magnetically attracted;

[0053] During operation, as the conveyor belt 2 moves along with the controller driving the glass cup, the controller will synchronously control the motor 13 to rotate, and the rotation of the motor 13 will drive the roller 51 to rotate, and the rotation of the roller 51 will drive the circulating belt 5 to drive accordingly, and the transmission of the circulating belt 5 will drive the light stick 6 connected to the outer surface to move accordingly, and the light stick 6 will move from the bottom edge of the circulating belt 5 to the first inclined surface, and the first inclined surface will drive the light stick 6 to gradually approach the conveyor belt 2 as the circulating belt 5 is driven. Since the light stick 6 is hinged to the surface of the circulating belt 5 through the base block 61, the light stick 6 can move freely between the base. In order to make the lamp stick 6 vertically inserted into the through hole 21 and avoid the situation where the inner side of the glass is pushed open and shifted after being tilted into the through hole 21, the controller will control the No. 2 magnet 14 to generate magnetic attraction, and attract the No. 1 magnet 62 through the magnetic force of the No. 2 magnet 14, so that the lamp stick 6 is vertical on the two inclined surfaces and the top edge on the circulating belt 5, so that the lamp stick 6 can enter the through hole 21 in a vertical state and move out of the through hole 21 in a vertical state, avoiding the situation where the lamp stick 6 in a tilted state enters or moves out of the through hole 21 and causes interference, thereby greatly improving the stability of the lamp stick 6 entering the inside of the glass.

[0054] As an embodiment of the present invention, the middle part of the outer surface of the circulating belt 5 is fixedly connected to a ring strip 52; the ring strip 52 and the circulating belt 5 are both elastic; a slide groove 63 is provided on a side of the base block 61 away from the lamp stick 6; the slide groove 63 is connected to both sides of the base block 61; the width of the slide groove 63 is equal to that of the ring strip 52; a threaded hole 64 is provided on one of the groove walls of the slide groove 63; a bolt 65 is connected to the inner thread of the threaded hole 64; there are multiple through holes 21;

[0055] During operation, before the conveyor belt 2 is conveyed under the control of the controller, the distance between the through holes 21 where two adjacent workpieces are located is measured first, and then the bolt 65 is screwed and rotated in the bolt 65 hole. The bolt 65 will move away from the ring strip 52 during the screwing process, so that the base block 61 and the ring strip 52 are unlocked, and the staff pushes the base block 61 to slide on the ring strip 52, so that the distance between the two adjacent base blocks 61 is equal to the distance between the through holes 21 where the two adjacent workpieces are located, and then the bolt 65 is screwed and rotated in the threaded hole 64. After the rotation, the bolt 65 will abut against the ring strip 52, so that the base block 61 and the ring strip 52 are locked, and the base block 61 is moved, so that the circulating belt 5 drives the light stick 6 under the transmission. Inserted into the corresponding through hole 21, this embodiment can adjust the position of the lamp stick 6 on the circulating belt 5 according to the distance between the through holes 21 where two adjacent workpieces are located, so that this embodiment can make corresponding adjustments for workpieces with different spacings, and has a wide range of applications. The distance between the two base blocks 61 referred to in this embodiment refers to the length of the ring bar 52 where the two base blocks 61 are located; by setting the ring bar 52 to be elastic, on the one hand, the transmission of the circulating bar 52 is satisfied, and on the other hand, under the extrusion action of the bolt 65, the position of the ring bar 52 close to the threaded hole 64 is squeezed by the bolt 65, so that the surrounding part of the ring bar 52 close to the threaded hole 64 is deformed, so that the ring bar 52 is more tightly connected to the base block 61.

[0056] As an embodiment of the present invention, the outer wall of one end of the lamp stick 6 away from the base block 61 is fixedly connected to the scraper 7; the edge of the scraper 7 away from the lamp stick 6 is adapted to the inner wall of the workpiece;

[0057] During operation, as the lamp stick 6 moves driven by the circulating belt 5, the lamp stick 6 will drive the scraper 7 to move synchronously. Since the end of the lamp stick 6 is connected to the No. 1 magnet 62, the No. 1 magnet 62 controls the lamp stick 6 to always be in a vertical state under the magnetic force of the No. 2 magnet 14, so that the lamp stick 6 drives the scraper 7 to pass through the through hole 21 and enter the inner side of the workpiece in a vertical state. The edge of the scraper 7 away from the lamp stick 6 is adapted to the inner wall of the workpiece, so that when the lamp stick 6 drives the scraper 7 to enter the inner side of the workpiece, the edge of the scraper 7 can scrape the inner wall of the glass cup, so that after being scraped by the scraper 7, the impurities on the inner wall of the glass cup are scraped clean, thereby avoiding the influence of impurities on the detection accuracy of visual detection.

[0058] As an embodiment of the present invention, the scraper 7 is provided with a pressure relief groove 71 running through the upper and lower parts; the lower groove of the pressure relief groove 71 is hingedly connected to a cover plate 72; the lamp bar 6 of the cover plate 72 covers the pressure relief groove 71 during the process of moving out of the inner side of the workpiece;

[0059] During operation, the lamp stick 6 vertically enters the through hole 21 under the action of magnetic force and moves into the inner side of the glass. The lamp stick 6 drives the scraper 7 to move synchronously during the process of entering the inner side of the glass along the through hole 21. The edge of the scraper 7 away from the lamp stick 6 is adapted to the inner wall of the glass. The scraper 7 separates the space in the glass into an upper cavity and a lower cavity. The upper cavity gradually decreases as the scraper 7 moves upward. The gas in the upper cavity increases under the pressure, so that the gas in the upper cavity pushes the cover plate 72 open and flows along the pressure relief groove 71. The light rod 6 moves vertically out of the glass and the inner side of the through hole 21 under the action of the magnetic force, and the light rod 6 drives the scraper 7 to move synchronously, so that the space of the upper cavity becomes larger and the space of the lower cavity becomes smaller. After the space of the upper cavity becomes larger, negative pressure is formed, and the cover plate 72 covers the lower notch of the pressure relief groove 71 under the action of the negative pressure, so that the glass is firmly stabilized on the conveyor belt 2 during the downward movement of the light rod 6 and the scraper 7.

[0060] As an embodiment of the present invention, the cover plate 72 is hinged to the lower notch of the pressure relief groove 71 through a torsion spring 73; the torsion force of the torsion spring 73 is less than the gravity of the workpiece; the cover plate 72 overcomes the torsion force of the torsion spring 73 and opens the lower notch of the pressure relief groove 71 when the lamp bar 6 enters the inner side of the workpiece;

[0061] During operation, when the lamp stick 6 drives the scraper 7 to enter the inner side of the glass along the through hole 21, the pressure of the gas in the upper chamber increases after being pressurized, and the gas in the upper chamber will overcome the torsion force of the torsion spring 73 to open the cover plate 72. The torsion force of the torsion spring 73 is less than the weight of the glass, and the gas in the upper chamber is depressurized along the pressure relief groove 71. When the lamp stick 6 drives the scraper 7 to move out from the inner side of the glass, the air pressure in the upper chamber decreases to form a negative pressure. Under the action of the torsion spring 73 and the negative pressure, the cover plate 72 can more easily and timely cover the lower notch of the pressure relief groove 71, so that the glass can be quickly stabilized during the removal of the lamp stick 6.

[0062] As an embodiment of the present invention, the scraper 7 is made of an elastic material, such as rubber; the edge of the scraper 7 is bent upward; the scraper 7 is pressed and expanded during the upward movement and contacts the inner wall of the workpiece;

[0063] During operation, when the scraper 7 enters the inner side of the glass along with the lamp stick 6, the gas pressure generated by the squeezing of the upper cavity will force the elastic scraper 7 to expand accordingly, and the edge of the scraper 7 will contact the inner wall of the glass under pressure and open, thereby expanding the applicable scope of the scraper 7. As the air pressure in the upper cavity further increases, the gas will open the pressure relief groove 71 to achieve pressure relief. The cover plate 72 has a limited opening angle under the action of the torsion spring 73, so that the pressure relief speed of the pressure relief groove 71 on the upper cavity is limited, so that the upper cavity can still maintain a certain pressure, so that the scraper 7 remains in an open state, and the impurities scraped off by the edge of the scraper 7 will move toward the center along the upper end surface of the scraper 7. As the scraper 7 moves up and contacts the top wall of the workpiece, the scraper 7 is squeezed and is in an open state, so that the impurities are caught by the opened scraper 7. When the lamp stick 6 is removed from the glass, the airflow enters the upper cavity along the gap between the scraper 7 and the inner wall of the glass, so that the removal of the scraper 7 generates a certain negative pressure on the one hand, and the scraper 7 can be removed smoothly on the other hand.

[0064] As an embodiment of the present invention, the position where the cover plate 72 is hinged with the lower notch of the pressure relief groove 71 is arranged close to the corresponding lamp rod 6; the cover plate 72 guides the airflow discharged from the pressure relief groove 71 to the inner wall of the workpiece;

[0065] During operation, the position where the cover plate 72 is hinged to the lower notch of the pressure relief groove 71 is set close to the lamp stick 6, so that the pressure in the upper chamber is increased. In the process of overcoming the torsion spring 73 to open the cover plate 72, the cover plate 72 will guide the gas discharged from the pressure relief groove 71, so that the gas impacts toward the inner wall of the workpiece under the guiding action, so that the impurities on the inner wall of the workpiece are further impacted by the airflow after being scraped away, thereby improving the cleanliness of the inner wall of the workpiece, and the scraper 7 blocks the light emitted by the lamp stick 6, so that the light emitted by the lamp stick 6 illuminates the side wall of the workpiece. The cover plate 72 in this embodiment can be arranged in multiples to achieve airflow impact in multiple directions.

[0066] As an embodiment of the present invention, the magnetic force between the second magnet 14 and the first magnet 62 is greater than the gravity of the light rod 6 on the bottom edge of the circulating belt 5;

[0067] During operation, the effective magnetic coverage range of the second magnet 14 and the first magnet 62 covers the entire circulating belt 5, so that when the lamp stick 6 moves on the second inclined plane, the second inclined plane will drive the lamp stick 6 and the scraper 7 to move out from the corresponding through hole 21 and the glass cup. Due to the magnetic force between the first magnet 62 and the second magnet 14, the lamp stick 6 is in a vertical state, and as the second inclined plane of the circulating belt 5 turns to the bottom edge, the lamp stick 6 is in a horizontal state on the bottom edge of the circulating belt 5. As the circulating belt 5 transfers from the bottom edge to the first inclined plane, the lamp stick 6 will flip from the horizontal state to the vertical state. During the flipping process, the lamp stick 6 will drive the scraper 7 to move synchronously, thereby throwing out impurities on the scraper 7 to prevent impurities from affecting the scraping effect of the scraper 7.

[0068] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0069] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A machine vision detection and screening device, comprising: A detection box (1); the bottom of the detection box (1) is fixedly connected to the top of the base (11), and avoidance grooves (12) are provided through both sides of the detection box (1); A conveyor belt (2); the conveyor belt (2) passes through avoidance grooves (12) on both sides of the detection box (1) and is pulled and supported by a pulling assembly; A camera assembly (3); the camera assembly (3) is located inside the detection box (1) and is used to photograph the workpiece on the conveyor belt (2); A screening component (4); the screening component (4) is located on one side of the detection box (1) and is used to remove unqualified workpieces after detection; Controller; the controller is used to control the automatic operation of the detection and screening device; Characterized in that the detection and screening device also includes: A circulating belt (5); the circulating belt (5) is located inside the detection box (1) and below the conveyor belt (2); Light rods (6); the light rods (6) are fixedly connected to the outer surface of the circulating belt (5) at equal intervals; A through hole (21); the through hole (21) is arranged through the conveyor belt (2); the distance between two adjacent through holes (21) is equal to the straight-line distance between adjacent lamp bars (6); A roller (51) is provided on the inner side of the circulating belt (5); there are at least four rollers (51) and the circulating belt (5) is stretched to form an isosceles trapezoid; under the action of the rollers (51), the circulating belt (5) is composed of a top edge, an inclined surface and a bottom edge; the outer wall of the detection box (1) is fixedly connected to the motor (13); the output shaft of the motor (13) is fixedly connected to one end of one of the rollers (51); the lamp stick (6) is hinged to the surface of the circulating belt (5) through a base block (61); the end of the lamp stick (6) away from the corresponding base block (61) is connected to a first magnet (62); the top of the detection box (1) is fixedly connected to a second magnet (14); the first magnet (62) and the second magnet (14) are magnetically attracted to each other; The middle part of the outer surface of the circulating belt (5) is fixedly connected to a ring strip (52); the ring strip (52) and the circulating belt (5) are both elastic; a slide groove (63) is provided on a side of the base block (61) away from the lamp stick (6); the slide groove (63) is connected to both sides of the base block (61); the width of the slide groove (63) is equal to that of the ring strip (52); a threaded hole (64) is provided on one of the groove walls of the slide groove (63); a bolt (65) is connected to the inner thread of the threaded hole (64); the through hole (21) is multiple; The outer wall of one end of the lamp stick (6) away from the base block (61) is fixedly connected to a scraper (7); the edge of the scraper (7) away from the lamp stick (6) is adapted to the inner wall of the workpiece; The scraper (7) is provided with a pressure relief groove (71) running through the top and bottom; the lower groove of the pressure relief groove (71) is hingedly connected to a cover plate (72); and the light rod (6) of the cover plate (72) covers the pressure relief groove (71) when it is moved out of the inner side of the workpiece.

2. A machine vision detection and screening device according to claim 1, characterized in that: The cover plate (72) is hinged to the lower notch of the pressure relief groove (71) via a torsion spring (73); the torsion force of the torsion spring (73) is smaller than the gravity of the workpiece; and the cover plate (72) overcomes the torsion force of the torsion spring (73) and opens the lower notch of the pressure relief groove (71) when the lamp bar (6) enters the inner side of the workpiece.

3. A machine vision detection and screening device according to claim 1, characterized in that: The scraper (7) is made of an elastic material; the edge of the scraper (7) is bent upward; and the scraper (7) is compressed and expanded during its upward movement to contact the inner wall of the workpiece.

4. A machine vision detection and screening device according to claim 1, characterized in that: The position where the cover plate (72) is hinged to the lower notch of the pressure relief groove (71) is arranged close to the corresponding lamp rod (6); the cover plate (72) guides the airflow discharged from the pressure relief groove (71) to the inner wall of the workpiece.

5. A machine vision detection and screening device according to claim 4, characterized in that: The magnetic force between the second magnet (14) and the first magnet (62) is greater than the gravity of the lamp stick (6) on the bottom edge of the circulating belt (5).

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