Appearance inspection equipment

Abstract

The utility model provides appearance inspection equipment which comprises a machine frame, a material belt is correspondingly conveyed on the machine frame, and a plurality of inspection mechanisms used for inspecting the appearance of a product to be inspected are correspondingly arranged on the machine frame. A material belt cutting mechanism is correspondingly arranged on one side of the discharging end of the machine frame, a containing plate used for stacking small sections of material belts is correspondingly arranged on the outer side of the material belt cutting mechanism, and the containing plate can be driven to rotate. Two inclined placing frames which incline downwards are correspondingly arranged on the two sides of the lower portion of the front portion of the placing plate, the two ends of the inclined placing frames are installed on the machine frame through second vertical frames, and the placing plate is driven to rotate so that the small sections of material belts stacked on the placing plate can automatically slide to the two inclined placing frames. According to the utility model, the subsequent operations such as blanking and packaging are greatly facilitated, the working efficiency is improved, the overall design is ingenious, the operation is flexible and convenient, and the practicability is strong.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of appearance inspection, and in particular to an appearance inspection device. Background Art

[0002] Appearance inspection is an indispensable process in the production and manufacturing of some electronic components, such as photoresistors. By inspecting the surfaces of both sides for defects such as tinning, connecting pieces, missing corners, long claws, straight leads, poor markings, exploded pieces, impurities in the isolation zone, protrusions, and whether there is exposed porcelain on the sides, we can evaluate them and determine whether they are good or bad products so that they can be screened out.

[0003] The coil inspection machine is a common appearance inspection equipment. The products to be tested are clamped on the material belt in order, and the material belt is conveyed through the material tray and guide wheel. During the conveying process, the products to be tested on the material belt are inspected in turn by the CCD camera. However, when the existing coil inspection equipment is used, the material belt on the upper material tray is usually conveyed and inspected, and then wound on the lower material tray, and finally the good products on the material belt are unloaded, packaged and sealed. Since the material belt is directly wound and rolled on the lower material tray, it is very inconvenient to carry out subsequent packaging and other work, and the operation is troublesome and inefficient. Therefore, it is necessary to propose an improvement measure to solve the above technical problems.

[0004] It should be noted that the above contents belong to the technical cognition scope of the inventor. Since the technical contents in this field are vast and too complicated, the above contents of this application do not necessarily constitute prior art. Utility Model Content

[0005] 1. Technical problems to be solved by the utility model:

[0006] The utility model provides an appearance inspection device to solve the technical problems existing in the above-mentioned background technology.

[0007] 2. Technical solution:

[0008] To achieve the above-mentioned purpose, the technical solution provided by the utility model is: an appearance inspection device, including a frame, on which a material belt is conveyed, and the frame is also provided with a plurality of inspection mechanisms for inspecting the appearance of the product to be tested; a material belt cutting mechanism is provided on one side of the discharging end of the frame, and a placement plate for stacking small sections of material belt is provided on the outer side of the material belt cutting mechanism, and the placement plate can be driven to rotate; two downward-inclined inclined placement racks are provided on both sides of the lower front part of the placement plate, and both ends of the inclined placement rack are installed on the frame through a second vertical frame, and driving the placement plate to rotate can make the small sections of material belt stacked thereon automatically slide onto the two inclined placement racks.

[0009] Furthermore, first upright frames are correspondingly provided on both sides of the rear of the placement plate, the first upright frames are fixedly installed on the frame, a connecting plate is correspondingly installed between the two first upright frames, and the rear side of the placement plate is rotatably installed on the connecting plate; a fifth telescopic cylinder is rotatably installed at the corresponding position on the frame, and the telescopic rod end of the fifth telescopic cylinder is rotatably connected to the bottom of the placement plate.

[0010] Furthermore, the material strip cutting mechanism includes a second fixed seat, a fourth telescopic cylinder is fixedly installed in the middle of the second fixed seat, an upper pressure plate is installed in the telescopic end of the bottom of the fourth telescopic cylinder, a lower support plate is provided below the upper pressure plate, the lower support plate is connected to the second fixed seat, and the material strip is transmitted between the lower support plate and the upper pressure plate; a third telescopic cylinder is installed on the top of the second fixed seat, a third cutting tool is connected to the telescopic end of the bottom of the third telescopic cylinder, and a second guide sleeve is also provided on the second fixed seat, the third cutting tool slides vertically through the second guide sleeve, and the material strip is cut into small sections by the third cutting tool.

[0011] Furthermore, a loading tray is rotatably installed on the side of the frame away from the material strip cutting mechanism, and a first guide wheel group mechanism, a side CCD inspection mechanism, a bottom inspection mechanism, a top inspection mechanism, a first defective product cutting mechanism, a second defective product cutting mechanism and a second guide wheel group mechanism are respectively correspondingly arranged between the loading tray on the frame and the material strip cutting mechanism; the side CCD inspection mechanism includes a first fixed plate, on which a first mounting plate is correspondingly installed, the first mounting plate is rotatably connected to the first fixed plate and is fixed in a limited position by bolts; a first slide rail is correspondingly arranged on the first mounting plate, on which a first slide seat and a second slide seat are correspondingly slidably installed, and the first slide seat and the second slide seat are limited in position by bolts; a first CCD camera and a first annular light source are respectively correspondingly installed on the first slide seat and the second slide seat, and the first annular light source is correspondingly located between the first CCD camera and the material strip.

[0012] Furthermore, the bottom inspection mechanism and the top inspection mechanism both include a second slide rail, on which a third slide, a fourth slide and a fifth slide are correspondingly slidably mounted, and on which the third slide, the fourth slide and the fifth slide are correspondingly mounted a second CCD camera, a second annular light source and a reflector, respectively, and the material belt passes through between the second annular light source and the reflector; a rectangular groove is opened at a corresponding position on the frame, and the second slide rail of the bottom inspection mechanism is correspondingly mounted on one side of the rectangular groove, and the second CCD camera and the second annular light source of the bottom inspection mechanism are correspondingly located below the material belt, and the reflector of the bottom inspection mechanism is correspondingly located above the material belt; the second slide rail of the top inspection mechanism is correspondingly mounted on the frame, and the second CCD camera and the second annular light source of the top inspection mechanism are correspondingly located above the material belt, and the reflector of the top inspection mechanism is correspondingly located below the material belt; and one side of the reflector of the bottom inspection mechanism and the top inspection mechanism is correspondingly mounted with a supplementary light source pointing to the material belt.

[0013] 3. Beneficial effects:

[0014] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0015] The utility model has a reasonable design. By arranging a material strip cutting mechanism, the inspected material strip is cut into small sections of equal length, and a rotatable placement plate is used so that a certain amount of small material strips stacked thereon can automatically slide onto two inclined frames, so that the cut small material strips can continue to be stacked on the placement plate, thereby ensuring the continuous progress of work. The utility model is flexible in use as a whole, greatly facilitates subsequent operations such as unloading and packaging, and improves work efficiency. The utility model also optimizes and improves the specific structure of the side CCD inspection mechanism, so that the inspection position and angle are adjustable. Compared with the traditional method, the inspection is more flexible and convenient. The overall design is ingenious, the operation is flexible and convenient, and the practicability is strong.

[0016] It should be noted that the structures not introduced in the present invention are not related to the design points and improvement directions of the present invention, and are the same as the prior art or can be implemented by using the prior art, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the appearance inspection equipment of the utility model;

[0018] Figure 2 It is a front cross-sectional structural schematic diagram of the appearance inspection device of the utility model;

[0019] Figure 3 It is an enlarged structural schematic diagram of the frame feeding belt cutting mechanism of the utility model;

[0020] Figure 4It is an enlarged structural schematic diagram of the CCD inspection mechanism on the upper side of the frame of the utility model.

[0021] Reference numerals:

[0022] 1. Frame; 2. Box shell; 3. Loading tray; 4. First guide wheel group mechanism; 5. Side CCD inspection mechanism; 501. First fixing plate; 502. First mounting plate; 503. First slide rail; 504. First CCD camera; 505. First slide seat; 506. Second slide seat; 507. First annular light source; 6. Bottom inspection mechanism; 7. Top inspection mechanism; 701. Second slide rail; 702. Third slide seat; 703. Second CCD camera; 704. Fourth slide seat; 705. Second annular light source; 706. Reflector; 707. Supplementary light source; 8. First defective product cutting mechanism; 801. First defective product box; 802. First telescopic cylinder; 803 , the first cutting tool; 9, the second defective product cutting mechanism; 901, the second defective product box; 902, the second telescopic cylinder; 903, the second cutting tool; 10, the first fixed seat; 11, the first guide sleeve; 12, the second guide wheel group mechanism; 13, the material strip cutting mechanism; 1301, the second fixed seat; 1302, the third telescopic cylinder; 1303, the second guide sleeve; 1304, the third cutting tool; 1305, the fourth telescopic cylinder; 1306, the upper pressure plate; 1307, the lower support plate; 14, the computer display; 15, the tilting placement rack; 16, the placement plate; 17, the first stand; 18, the connecting plate; 19, the second stand; 20, the fifth telescopic cylinder; 21, the infrared sensor. DETAILED DESCRIPTION

[0023] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "page", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", "provided with", "provided on" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Example

[0027] See attached Figure 1-4, a visual inspection device of this embodiment includes a frame 1, on which a material belt is correspondingly conveyed, and on which a plurality of inspection mechanisms for inspecting the appearance of the product to be tested are correspondingly arranged. Specifically, a loading tray 3 is rotatably mounted on the side of the frame 1 away from the material belt cutting mechanism 13, and a first guide wheel group mechanism 4, a side CCD inspection mechanism 5, a bottom inspection mechanism 6, a top inspection mechanism 7, a first defective product cutting mechanism 8, a second defective product cutting mechanism 9 and a second guide wheel group mechanism 12 are correspondingly arranged between the loading tray 3 and the material belt cutting mechanism 13 on the frame 1. A box shell 2 is also correspondingly installed on the upper part of the frame 1, and openings for the material belt to enter and pass through are correspondingly arranged on both sides of the box shell 2. The first guide wheel group mechanism 4 and the second guide wheel group mechanism 12 both include a plurality of guide wheels staggeredly distributed up and down, one of which is correspondingly connected to a motor, and the material belt is conveyed through the first guide wheel group mechanism 4 and the second guide wheel group mechanism 12. An infrared sensor 21 is also provided between the side CCD inspection mechanism 5 and the first guide wheel group mechanism 4. The infrared sensor 21 includes an infrared transmitter and a receiver. The infrared transmitter and the receiver are mounted on the frame 1 through a fixed stand. The products to be tested on the material belt pass through the infrared transmitter and the receiver. During operation, the material belt on the loading tray 3 is transferred on the frame 1. The infrared sensor 21 detects whether there is material. The side CCD inspection mechanism 5, the bottom inspection mechanism 6, and the top inspection mechanism 7 are used to perform an appearance inspection on the products to be tested on the material belt. The front part of the box shell 2 is provided with a box door, and the upper part of the box shell 2 is provided with a computer display 14. The motors of the first guide wheel group mechanism 4 and the second guide wheel group mechanism 12, the telescopic cylinders on the first defective product cutting mechanism 8 and the second defective product cutting mechanism 9, and the CCD cameras and light source switches on the side CCD inspection mechanism 5, the bottom inspection mechanism 6, and the top inspection mechanism 7 are all electrically connected to the control system in the box shell 2. The computer display 14 is also electrically connected to the control system to realize automatic work, and the detection results of the camera are displayed on the computer display 14. It is worth noting that the loading tray 3, the first guide wheel group mechanism 4, the bottom inspection mechanism 6, the top inspection mechanism 7, the first defective product cutting mechanism 8, the second defective product cutting mechanism 9 and the second guide wheel group mechanism 12 arranged on the frame 1 are basically the same as those on the existing appearance inspection mechanism, so they will not be described in detail here.

[0028] A material strip cutting mechanism 13 is provided on one side of the discharging end of the frame 1. The material strip cutting mechanism 13 comprises a second fixed seat 1301, a fourth telescopic cylinder 1305 is fixedly installed in the middle of the second fixed seat 1301, an upper pressing plate 1306 is installed at the telescopic end at the bottom of the fourth telescopic cylinder 1305, a lower supporting plate 1307 is provided below the upper pressing plate 1306, the lower supporting plate 1307 is connected to the second fixed seat 1301, and a material strip is transmitted between the lower supporting plate 1307 and the upper pressing plate 1306; a third telescopic cylinder 1302 is installed on the top of the second fixed seat 1301, a third cutting tool 1304 is connected to the telescopic end at the bottom of the third telescopic cylinder 1302, and a second guide sleeve 1303 is also provided on the second fixed seat 1301, the third cutting tool 1304 vertically slides through the second guide sleeve 1303, and the material strip is cut into small sections by the third cutting tool 1304.

[0029] The outer side of the strip cutting mechanism 13 is also provided with a placement plate 16 for stacking small strips, and the placement plate 16 can be driven to rotate. Two downwardly inclined placement racks 15 are provided on both sides of the front lower part of the placement plate 16, and the two ends of the inclined placement rack 15 are installed on the frame 1 through the second vertical rack 19. The small strips stacked thereon can automatically slide onto the two inclined placement racks 15 by driving the placement plate 16 to rotate. Specifically, the first vertical racks 17 are provided on both sides of the rear part of the placement plate 16, and the first vertical racks 17 are fixedly installed on the frame 1. A connecting plate 18 is installed between the two first vertical racks 17, and the rear side of the placement plate 16 is rotatably installed on the connecting plate 18; a fifth telescopic cylinder 20 is rotatably installed at a corresponding position on the frame 1, and the telescopic rod end of the fifth telescopic cylinder 20 is rotatably connected to the bottom of the placement plate 16. The third telescopic cylinder 1302, the fourth telescopic cylinder 1305 and the fifth telescopic cylinder 20 are also electrically connected to the control system. After the third telescopic cylinder 1302 has cut a certain number of times, the control system controls the fifth telescopic cylinder 20 to work, and the fifth telescopic cylinder 20 is used to drive the placement plate 16 to rotate to the same angle as the inclined placement rack 15, so that a certain number of small sections of material strips stacked on the placement plate 16 automatically slide onto the two inclined placement racks 15, and then the fifth telescopic cylinder 20 is used to reset the placement plate 16 to continue working, while the small sections of material strips placed on the inclined placement racks 15 can wait to be taken away by workers.

[0030] Since the side CCD inspection mechanism 5 of the traditional appearance inspection mechanism is generally directly fixed and installed on one side of the material belt, the upper and lower angles cannot be adjusted, and the inspection is relatively inconvenient. Therefore, the specific structure of the side CCD inspection mechanism 5 is optimized and improved in this embodiment. Specifically, the side CCD inspection mechanism 5 includes a first fixed plate 501, and a first mounting plate 502 is correspondingly installed on the first fixed plate 501. The first mounting plate 502 is rotatably connected with the first fixed plate 501 and is fixed by bolts. A first slide rail 503 is correspondingly provided on the first mounting plate 502, and a first slide seat 505 and a second slide seat 506 are correspondingly slidably installed on the first slide rail 503. The first slide seat 505 and the second slide seat 506 are limited by bolts. A first CCD camera 504 and a first annular light source 507 are respectively installed on the first slide seat 505 and the second slide seat 506, and the first annular light source 507 is correspondingly located between the first CCD camera 504 and the material belt.

[0031] The bottom inspection mechanism 6 and the top inspection mechanism 7 both include a second slide rail 701, on which a third slide 702, a fourth slide 704 and a fifth slide are correspondingly slidably mounted, and a second CCD camera 703, a second annular light source 705 and a reflector 706 are correspondingly mounted on the third slide 702, the fourth slide 704 and the fifth slide, respectively, and the material belt passes through between the second annular light source 705 and the reflector 706; a rectangular groove is provided at a corresponding position on the frame 1, and the second slide rail 701 of the bottom inspection mechanism 6 is correspondingly mounted on one side of the rectangular groove, and the second CCD camera 703 and the second annular light source 705 of the bottom inspection mechanism 6 are correspondingly located below the material belt, and the reflector 706 of the bottom inspection mechanism 6 is correspondingly located above the material belt; the second slide rail 701 of the top inspection mechanism 7 is correspondingly mounted on the frame 1, and the second CCD camera 703 and the second annular light source 705 of the top inspection mechanism 7 are correspondingly located above the material belt, and the reflector 706 of the top inspection mechanism 7 is correspondingly located below the material belt. In order to further ensure the inspection effect, in this embodiment, supplementary light sources 707 pointing to the items to be tested on the material belt are installed on one side of the reflective plates 706 of the bottom inspection mechanism 6 and the top inspection mechanism 7, so as to increase the brightness and ensure the inspection effect.

[0032] The first defective product cutting mechanism 8 includes a first defective product box 801 and a first telescopic cylinder 802, and the second defective product cutting mechanism 9 includes a second defective product box 901 and a second telescopic cylinder 902. The first telescopic cylinder 802 and the second telescopic cylinder 902 are correspondingly installed on the top of the first fixed seat 10, and the first fixed seat 10 is correspondingly installed on the frame 1. The middle part of the first fixed seat 10 is correspondingly provided with two first guide sleeves 11, and the telescopic ends of the bottoms of the first telescopic cylinder 802 and the second telescopic cylinder 902 are respectively connected with the first cutting tool 803 and the second cutting tool 903. The first cutting tool 803 and the second cutting tool 903 slide through the two first guide sleeves 11 respectively. 1, the products to be tested on the material belt are located at the bottom of the first cutting tool 803 and the second cutting tool 903; the second defective product box 901 and the second telescopic cylinder 902 are located below the material belt, and are respectively located directly below the first cutting tool 803 and the second cutting tool 903. The products to be tested on the material belt are visually inspected by the side CCD inspection mechanism 5, the bottom inspection mechanism 6 and the top inspection mechanism 7. After the inspection, the image is transmitted to the control system for analysis and comparison. If defective products appear, the first defective product cutting mechanism 8 or the second defective product cutting mechanism 9 is controlled by the control system to cut the defective products on the material belt so that they fall into the first defective product box 801 or the second defective product box 901.

[0033] The above-described embodiments only express a certain implementation method of the utility model, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the patent of the utility model shall be based on the attached claims.

Claims

1. An appearance inspection device, comprising a frame (1), a material belt being conveyed on the frame (1), and a plurality of inspection mechanisms for inspecting the appearance of a product to be inspected being arranged on the frame (1); characterized in that: A material strip cutting mechanism (13) is provided on one side of the material discharging end of the frame (1), and a placement plate (16) for stacking small sections of material strip is provided on the outer side of the material strip cutting mechanism (13), and the placement plate (16) can be driven to rotate; two downwardly inclined placement racks (15) are provided on both sides of the lower front part of the placement plate (16), and the two ends of the inclined placement rack (15) are mounted on the frame (1) via a second vertical frame (19), and the placement plate (16) can be driven to rotate so that the small sections of material strip stacked thereon can automatically slide onto the two inclined placement racks (15).

2. A visual inspection device according to claim 1, characterized in that: A first upright frame (17) is correspondingly provided on both sides of the rear of the placement plate (16), the first upright frame (17) is fixedly mounted on the frame (1), a connecting plate (18) is correspondingly installed between the two first upright frames (17), and the rear side of the placement plate (16) is rotatably mounted on the connecting plate (18); a fifth telescopic cylinder (20) is rotatably mounted at a corresponding position on the frame (1), and an end of a telescopic rod of the fifth telescopic cylinder (20) is rotatably connected to the bottom of the placement plate (16).

3. The appearance inspection device according to claim 1, characterized in that: The strip cutting mechanism (13) comprises a second fixed seat (1301), a fourth telescopic cylinder (1305) is fixedly installed in the middle of the second fixed seat (1301), an upper pressing plate (1306) is installed in the telescopic end at the bottom of the fourth telescopic cylinder (1305), a lower supporting plate (1307) is provided below the upper pressing plate (1306), the lower supporting plate (1307) is connected to the second fixed seat (1301), and the lower supporting plate (1307) is connected to the upper pressing plate (1306). 306); a third telescopic cylinder (1302) is correspondingly installed on the top of the second fixed seat (1301), and a third cutting tool (1304) is correspondingly connected to the telescopic end of the bottom of the third telescopic cylinder (1302); a second guide sleeve (1303) is also correspondingly provided on the second fixed seat (1301), and the third cutting tool (1304) slides vertically through the second guide sleeve (1303), and the material belt is correspondingly cut into small sections using the third cutting tool (1304).

4. The appearance inspection device according to claim 1, characterized in that: A loading tray (3) is rotatably mounted on a side of the frame (1) away from the material strip cutting mechanism (13); a first guide wheel assembly mechanism (4), a side CCD inspection mechanism (5), a bottom inspection mechanism (6), a top inspection mechanism (7), a first defective product cutting mechanism (8), a second defective product cutting mechanism (9) and a second guide wheel assembly mechanism (12) are sequentially arranged between the loading tray (3) on the frame (1) and the material strip cutting mechanism (13); the side CCD inspection mechanism (5) comprises a first fixing plate (501), a first mounting plate (502) is correspondingly mounted on the first fixing plate (501), and the first mounting plate ( 502) is rotatably connected to the first fixed plate (501) and is fixed in position by bolts; the first mounting plate (502) is correspondingly provided with a first slide rail (503), and the first slide rail (503) is correspondingly slidably installed with a first slide seat (505) and a second slide seat (506), and the first slide seat (505) and the second slide seat (506) are limited in position by bolts; the first slide seat (505) and the second slide seat (506) are respectively correspondingly installed with a first CCD camera (504) and a first annular light source (507), and the first annular light source (507) is correspondingly located between the first CCD camera (504) and the material belt.

5. The appearance inspection device according to claim 4, characterized in that: The bottom inspection mechanism (6) and the top inspection mechanism (7) both comprise a second slide rail (701), on which a third slide seat (702), a fourth slide seat (704) and a fifth slide seat are correspondingly slidably mounted, and on the third slide seat (702), the fourth slide seat (704) and the fifth slide seat are correspondingly mounted a second CCD camera (703), a second annular light source (705) and a reflector (706), respectively, and the material belt passes through between the second annular light source (705) and the reflector (706); a rectangular groove is provided at a corresponding position on the frame (1), and the second slide rail (701) of the bottom inspection mechanism (6) is correspondingly mounted on one side of the rectangular groove, and the bottom The second CCD camera (703) and the second annular light source (705) of the bottom inspection mechanism (6) are correspondingly located below the material belt, and the reflector (706) of the bottom inspection mechanism (6) is correspondingly located above the material belt; the second slide rail (701) of the top inspection mechanism (7) is correspondingly installed on the frame (1), the second CCD camera (703) and the second annular light source (705) of the top inspection mechanism (7) are correspondingly located above the material belt, and the reflector (706) of the top inspection mechanism (7) is correspondingly located below the material belt; and a supplementary light source (707) pointing to the material belt is correspondingly installed on one side of the reflector (706) of the bottom inspection mechanism (6) and the top inspection mechanism (7).

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