Furniture production raw material wood defect detection device

Abstract

A furniture production raw material wood defect detection device comprises a connecting frame serving as a bearing body, a detection mechanism used for detecting whether wood has defects or not is arranged on the connecting frame, and feeding mechanisms are arranged on the two sides of the detection mechanism; the detection mechanism comprises a detection box fixed to the connecting frame, window shades are connected to the feeding side and the discharging side of the detection box correspondingly, a detector is arranged in the detection box, light supplementing lamps are connected to the upper side and the lower side in the detection box correspondingly, and the detector obtains images of the two sides of the wood and conducts defect judgment on the wood; the detection box is provided with a connecting support fixed to the connecting frame on the wood discharging side, the connecting support is connected with an air cylinder, the telescopic end of the air cylinder is connected with a marking head, and the marking head is externally connected with pigment through a feeding pipe. Clear images on the two sides of the wood are obtained through the detector so that accurate defect judgment can be carried out on the wood, and the judgment result is marked on the wood.

Description

Technical Field

[0001] The invention relates to the field of wood detection, and in particular to a device for detecting defects in wood, a raw material for furniture production. Background Art

[0002] In the modern furniture manufacturing industry, wood is the main raw material, and its quality is directly related to the quality and durability of the final product. However, during the growth, felling, transportation and processing of wood, it is inevitably affected by various natural factors or human operations, resulting in cracks, knots, decay, insect bites and other defects. Therefore, it is particularly important to conduct comprehensive and accurate defect detection on wood before it enters the production process.

[0003] Existing wood defect detection usually involves placing the wood on a detection device and then using the device's conveying mechanism to move the wood while performing the detection. However, most of the current detection equipment can only detect wood and cannot mark it after detection, which can easily lead to confusion in the subsequent classification and management of the wood, increasing the difficulty and error rate of manual identification. In addition, the vibration generated during the transportation process can easily cause damage to the wood, affecting the accuracy and efficiency of the detection, and also accelerating the wear of equipment components, shortening the service life of the equipment, making it inconvenient to use.

[0004] Therefore, it is necessary to design a furniture production raw material wood defect detection device that can perform double-sided inspection on the conveyed wood of different specifications and mark them, while limiting and damping the wood during transportation, so as to facilitate subsequent classification and management, prevent wood damage, extend the service life of the equipment, and improve the accuracy and efficiency of detection. Summary of the invention

[0005] In order to overcome the shortcomings of current equipment that cannot mark after detection, which easily leads to confusion in the subsequent classification and management of wood, increases the difficulty and error rate of manual identification, and easily causes damage to the wood during transportation, affecting the accuracy and efficiency of detection, and shortens the service life of the equipment, the present invention provides a furniture production raw material wood defect detection device that can mark the wood after double-sided detection of different specifications and limit and dampen the wood during transportation, thereby facilitating subsequent classification and management, preventing wood damage, extending the service life of the equipment, and improving the accuracy and efficiency of detection.

[0006] A device for detecting defects in wood materials used for furniture production comprises a connecting frame as a bearing body, a detecting mechanism for detecting whether the wood has defects is arranged on the connecting frame, and feeding mechanisms are arranged on both sides of the detecting mechanism; the detecting mechanism comprises a detecting box fixed on the connecting frame, the detecting box is connected to a blackout curtain on the inlet and outlet sides, a detecting instrument is arranged in the detecting box, and fill lights are connected to the upper and lower sides of the detecting box, the detecting instrument acquires images of both sides of the wood and performs defect judgment on the wood; the detecting box is provided with a connecting bracket fixed on the connecting frame on the wood outlet side, the connecting bracket is connected to a cylinder, and marking heads are connected to the telescopic ends of the cylinder, and the marking heads are externally connected to pigments through a feeding pipe.

[0007] Preferably, the connecting frame is provided with an adjustment mechanism for centering the wood, and the adjustment mechanism includes a fixed support frame, a double-axis motor, a screw, a movable frame and a guide rail; wherein the fixed support frame and the guide rail are arranged in parallel on the connecting frame, the fixed support frame is connected to the double-axis motor, and the two output shafts of the double-axis motor are connected to screws, the screws are rotatably connected to the fixed support frame, the screws are threadedly connected to one leg of the movable frame, and the other leg of the movable frame is slidably arranged on the guide rail. When wood of different sizes is placed on the conveyor belt, the double-axis motor starts to drive the corresponding screw to rotate, and under the action of the thread, the corresponding movable frame moves inward along the fixed support frame and the guide rail at the same time, thereby pushing the wood to move to the center.

[0008] Preferably, the mobile frame is provided with rollers that can rotate in the original position. When the rollers come into contact with the wood, the wood is guided to avoid obstruction to the progress of the wood.

[0009] Preferably, the feeding mechanism uses a conveyor belt to transport the wood, which has the advantages of low cost and long transmission distance.

[0010] Preferably, the feeding side of the detection box is provided with a flattening mechanism on the adjustment mechanism; the flattening mechanism includes a connecting and fixing frame, an in-position sensor, a hydraulic cylinder, a connecting and fixing rod, a rack, a gear, a connecting support frame, a guide roller frame and a spring; the outer side of the mobile frame is connected to the connecting and fixing frame, the inner side of the connecting and fixing frame is connected to the in-position sensor, the outer side is connected to a hydraulic cylinder, the telescopic end of the hydraulic cylinder is connected to a connecting and fixing rod, the connecting and fixing rod is slidably connected to the adjacent connecting and fixing frame, the upper side of the connecting and fixing rod is connected to a rack, the connecting and fixing frame is rotatably connected to the connecting support frame, the lower part of the connecting support frame is connected to a gear, the gear and the rack are meshed with each other, the upper part of the connecting support frame is slidably connected to a guide roller frame, and the guide roller frame is connected to the connecting support frame with a spring. The purpose is to press the wood passing through the detection box so that the detector can obtain clear images of both sides of the wood to accurately judge its defects.

[0011] Preferably, an adjustment mechanism is also provided at the discharge side of the detection box near the marking head, so as to flatten and stabilize the wood when the marking head is marking on the wood, so as to prevent the vibrating wood from directly hitting the marking head and causing damage to it.

[0012] Preferably, a cleaning mechanism is provided on the feeding side of the detection box, and the cleaning mechanism includes a fixed bracket, a cleaning nozzle and a shielding frame. The left side of the right part of the connecting frame is connected to a fixed bracket, and the fixed brackets are all folded. The fixed brackets are connected to the cleaning nozzles. The movable brackets on the feeding side are connected to shielding frames on the sides away from each other, and the shielding frames are in contact with the cleaning nozzles. Before the wood enters the detection box, the air pump is started to allow gas to enter the cleaning nozzle to remove impurities that fall on the surface of the wood.

[0013] Beneficial effects: Compared with the prior art, the present invention has the following technical effects: 1. The present invention conveys the wood to the detection box for detection through a conveyor belt. During transportation, the wood is limited by a guide roller frame, and the screw rod rotates. Under the action of the thread, the movable frame moves inward at the same time, so that the roller contacts the wood, and then pushes the wood to move to the center, preventing the wood from shifting and improving the stability of use.

[0014] 2. The present invention provides a flattening mechanism on both sides of the detection box. The flattening mechanism on the feed side presses the wood entering the detection box so that the detector can obtain clear images of both sides of the wood to make accurate defect judgments. The flattening mechanism on the discharge side is intended to flatten and stabilize the wood when the marking head marks on the wood, so as to prevent the vibrating wood from directly hitting the marking head and causing damage to it.

[0015] 3. The present invention allows gas to enter the cleaning nozzle and be ejected, thereby blowing away dust or impurities on the wood surface for cleaning, so that dust or impurities on the wood surface can be cleaned before detection, which is convenient for accurately identifying and evaluating defects on the wood surface, reducing the misjudgment rate, and further improving the accuracy and reliability of detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0017] Figure 2 It is a schematic diagram of a first partial three-dimensional structure of the present invention.

[0018] Figure 3 It is a schematic diagram of a second partial three-dimensional structure of the present invention.

[0019] Figure 4 It is a schematic diagram of the three-dimensional structure of the detection mechanism of the present invention.

[0020] Figure 5It is a partial three-dimensional structural cross-sectional diagram of the detection mechanism of the present invention.

[0021] Figure 6 It is a partial three-dimensional structural schematic diagram of the detection mechanism of the present invention.

[0022] Figure 7 It is a partial three-dimensional structural schematic diagram of the adjustment mechanism of the present invention.

[0023] Figure 8 It is a schematic diagram of the three-dimensional structure of the adjustment mechanism of the present invention.

[0024] Fig. 9 It is a three-dimensional structural schematic diagram of the cleaning mechanism of the present invention.

[0025] Fig.10 It is a schematic diagram of the first three-dimensional structure of the flat pressing mechanism of the present invention.

[0026] Fig.11 It is a schematic diagram of the second three-dimensional structure of the flat pressing mechanism of the present invention.

[0027] Fig.12 It is a third three-dimensional structural schematic diagram of the flat pressing mechanism of the present invention.

[0028] In the accompanying drawings: 1-connecting frame, 2-motor, 3-rotating shaft, 4-conveyor belt, 5-conveyor belt, 6-detection mechanism, 60-detection box, 61-shading curtain, 62-detector, 63-fill light, 64-connecting bracket, 65-cylinder, 66-marking head, 7-adjusting mechanism, 70-fixed support frame, 71-dual-axis motor, 72-screw rod, 73-movable frame, 74-guide rail, 8-cleaning mechanism, 80-fixed bracket, 81-cleaning nozzle, 82-shielding frame, 9-pressing mechanism, 90-connecting fixed frame, 91-in-place sensor, 92-hydraulic cylinder, 93-connecting fixed rod, 94-rack, 95-gear, 96-connecting support frame, 97-guide roller frame, 98-spring. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-12 The present invention is further described with specific embodiments.

[0030] A device for detecting defects in wood raw materials for furniture production, see attached Figure 1-7 And 10-12, including a detection mechanism 6 for detecting whether there are defects in wood, one side of which serves as a feeding side, and the wood to be detected enters the detection mechanism 6 from the feeding side to be detected, and leaves from the discharging side on the other side after the detection is completed.

[0031] The detection mechanism 6 is arranged on the connecting frame 1, and feeding mechanisms are arranged on both sides of the detection mechanism 6. Taking the feeding mechanism on the feeding side as an example, it includes a motor 2, a rotating shaft 3, a conveyor belt 4, and a conveyor belt 5. The connecting frame 1 is connected to two motors 2 on the feeding side, and the connecting frame 1 is also rotatably connected to three rotating shafts 3. The output shafts of the motors 2 are connected to the adjacent rotating shafts 3 through pulleys with conveyor belts 4, and two conveyor belts 5 are connected between the three rotating shafts 3. When it is necessary to perform defect detection on the raw material wood for furniture production, the wood is placed on the conveyor belt 5, the motor 2 is started to drive the conveyor belt 5 to move, and the wood moves under the action of the friction between it and the conveyor belt.

[0032] like Figure 1 , Figure 4 , Figure 5 and Figure 6 As shown, the detection mechanism 6 includes a detection box 60, a shading curtain 61, a detector 62 and a fill light 63. The detection box 60 is fixed on the connecting frame 1. The left and right sides of the detection box 60 are connected to the shading curtain 61. The detection box 60 is provided with a detector 62. The upper and lower sides of the detection box 60 are connected to the fill light 63. When the wood to be detected moves into the detection box 60, the fill light 63 illuminates both sides of the wood, and the detector 62 obtains images of both sides of the wood and makes defect judgments thereon.

[0033] After the detector 62 draws the conclusion of the defect detection of the current wood, the wood needs to be marked so as to screen out the unqualified wood and prevent it from entering the subsequent process. In this embodiment, the technical purpose is achieved by coloring and marking on one side of the wood. Specifically, the detection mechanism 6 also includes a connecting bracket 64, a cylinder 65 and a marking head 66. The detection box 60 is provided with a connecting bracket 64 fixed on the connecting frame 1 on the wood discharge side. The connecting bracket 64 is I-shaped. Two cylinders 65 are connected to the connecting bracket 64. The telescopic ends of the cylinders 65 are connected to the marking heads 66. The upper side of the marking heads 66, which are far away from each other, are provided with feeding pipes to facilitate external pigments.

[0034] In this embodiment, the feed pipes are respectively connected to pigments of different colors, so that the pigments enter the marking head 66. When the wood is detected to have defects, the cylinder 65 at the front of the connecting bracket 64 is started, and the connecting brackets 64 are all I-shaped, and the corresponding marking head 66 is driven by the cylinder 65 to move downward until it contacts the wood, so that the pigment is applied to the wood to mark it as unqualified; when the wood is detected to have no defects, the cylinder 65 at the rear of the connecting bracket 64 is started, and the corresponding marking head 66 is driven by the cylinder 65 to move and contact the wood, so that the pigment is applied to the wood to mark it as qualified.

[0035] In actual processes, the size of the wood varies according to the type. In order to ensure that the wood moves stably on the conveyor belt 5, an adjustment mechanism 7 for centering the wood of different specifications during transportation is provided on the connecting frame 1 in this embodiment. Specifically, Figure 1 , Figure 7 and Figure 8 As shown, the adjustment mechanism 7 includes a fixed support frame 70, a dual-axis motor 71, a screw rod 72, a movable frame 73 and a guide rail 74; the connecting frame 1 is connected to the parallel fixed support frame 70 and the guide rail 74, the fixed support frame 70 is connected to the dual-axis motor 71, and the two output shafts of the dual-axis motor 71 are connected to the screw rod 72, and the screw rod 72 is rotatably connected to the fixed support frame 70; the screw rod 72 is threadedly connected to one leg of the movable frame 73, and the other leg of the movable frame 73 is slidably arranged on the guide rail 74.

[0036] When wood of different sizes is placed on the conveyor belt 5, the dual-axis motor 71 starts to drive the corresponding screw rod 72 to rotate. Under the action of the thread, the corresponding moving frame 73 moves inward along the fixed support frame 70 and the guide rail 74 at the same time, thereby pushing the wood to move to the center.

[0037] In this embodiment, when the adjustment mechanism 7 is used to adjust the center of wood of different sizes, the moving frames 73 on both sides just need to contact the edges of the wood to avoid blocking the movement of the wood. Preferably, the moving frame 73 is provided with a roller 731 that can rotate in the original position, and when the roller 731 contacts the wood, the wood is guided.

[0038] As can be seen from the above description, the present embodiment transmits wood through the conveyor belt 5. The conveyor belt has the advantages of low cost and long transmission distance, and is suitable for the transmission of wood. However, it also has the characteristics of vibration. In the present embodiment, the detector 62 is required to obtain images of both sides of the wood and make defect judgments. The vibrating conveyor belt 5 causes the wood conveyed thereon to vibrate as well. The images of both sides of the wood obtained by the detector 62 may be blurred, and thus an accurate judgment cannot be made. Therefore, the present embodiment uses the flat pressing mechanism 9 to press the wood passing through the detection box 60.

[0039] The flattening mechanism 9 is arranged on the adjusting mechanism 7. Figure 1 , Fig.10 , Fig.11 and Fig.12As shown, the flattening mechanism 9 includes a connecting and fixing frame 90, an in-position sensor 91, a hydraulic cylinder 92, a connecting and fixing rod 93, a rack 94, a gear 95, a connecting support frame 96, a guide roller frame 97 and a spring 98; the outer side of the movable frame 73 is connected to the connecting and fixing frame 90, the inner side of the connecting and fixing frame 90 is connected to the in-position sensor 91, the outer side of the connecting and fixing frame 90 is connected to the hydraulic cylinder 92, the telescopic end of the hydraulic cylinder 92 is connected to the connecting and fixing rod 93, the connecting and fixing rod 93 is slidably connected to the adjacent connecting and fixing frame 90, the upper side of the connecting and fixing rod 93 is connected to the left and right racks 94, the connecting and fixing frame 90 is rotatably connected to the connecting and fixing frame 96, the lower part of the connecting support frame 96 is connected to the gear 95, the gear 95 and the rack 94 are meshed with each other, the upper part of the connecting support frame 96 is slidably connected to the guide roller frame 97, and the guide roller frame 97 and the connecting support frame 96 are connected to the spring 98.

[0040] It should be noted that, in this embodiment, an adjustment mechanism 7 is also provided on the discharge side of the detection box 60, near the position of the marking head 66 of the detection mechanism 6, so as to flatten and stabilize the wood when the marking head 66 marks the wood, so as to prevent the vibrating wood from directly hitting the marking head 66 and causing damage to it.

[0041] In this embodiment, when the detector 62 performs defect detection on both sides of the wood, it is necessary to isolate the interference of the external environment, such as filamentous impurities falling on the wood. In this embodiment, a cleaning mechanism 8 is provided on the feeding side of the detection box 60 to remove impurities falling on the surface of the wood, and then the cleaned wood enters the detection box 60. The detection box 60 maintains the internal closure by providing a blackout curtain 61 at the entry and exit position to avoid interference from impurities inside the detection box 60 after cleaning.

[0042] like Figure 1 and Fig. 9 As shown, the cleaning mechanism 8 includes a fixed bracket 80, a cleaning nozzle 81 and a shielding frame 82. The fixed bracket 80 is connected to the left side of the right part of the connecting frame 1. The fixed bracket 80 is folded. The cleaning nozzle 81 is connected to the fixed bracket 80. The movable bracket 73 on the feeding side is connected to the shielding frame 82 on the side away from each other. The shielding frame 82 is in contact with the cleaning nozzle 81. Before the wood enters the detection box 60, the air pump is started to allow the gas to enter the cleaning nozzle 81 and spray out from the unblocked air outlet to blow away the dust or impurities on the surface of the wood in the direction away from the detection box 60.

[0043] At the end of this embodiment, the working principle of the device for detecting defects in wood materials used in furniture production of the present invention is described as follows.

[0044] When it is necessary to perform defect detection on the wood raw material for furniture production, the present device can be used to make the connecting frame 1 contact with the ground, and then place the wood on the conveyor belt 5, and then start the double-axis motor 71 on the right, and drive the corresponding screw rod 72 to rotate through the double-axis motor 71; on the one hand, under the action of the thread, the corresponding moving frame 73 moves inward along the fixed support frame 70 and the guide rail 74 at the same time, so that the roller on the corresponding moving frame 73 contacts the wood, and then pushes the wood to move to the center; on the other hand, when the moving frame 73 moves, it will also drive the shielding frame 82 to move, and the shielding frame 82 will shield a part of the cleaning nozzle 81, so that part of the air outlet on the nozzle 81 is blocked, which is suitable for boards of different lengths.

[0045] Then, the motors 2 on both sides are started at the same time, and the pulleys are driven by the motors 2 to rotate, so that the conveyor belt 4 rotates, and then the rotating shaft 3 rotates, so that the conveyor belt 5 conveys the wood. When the wood moves past the in-place sensor 91, the in-place sensor 91 sends a signal to trigger the hydraulic cylinder 92 to start, and the hydraulic cylinder 92 drives the connecting and fixing rod 93 to move outward at the same time, so that the rack 94 on the connecting and fixing rod 93 moves outward, and the rack 94 and the gear 95 mesh with each other, so that the corresponding gear 95 rotates 90 degrees, and then drives the corresponding connecting support frame 96 to rotate 90 degrees, so that the guide roller frame 97 contacts the wood, and at the same time the spring 98 is squeezed, and the deformation of the spring 98 produces pressure on the wood, so that the wood and the conveyor belt 5 are flattened on the platform between the conveyor belts 5, so as to achieve the purpose of flattening the wood and suppressing its vibration, and at this time the elastic force increases the friction between the wood and the conveyor belt 5, and the wood can also stably enter the detection box 60 under the action of the roller on the guide roller frame 97.

[0046] Before the wood enters the detection box 60, the air pump is started to allow the gas to enter the cleaning nozzle 81 and spray out from the unblocked air outlet to blow away the dust or impurities on the surface of the wood; then the wood after being blown continues to move into the detection box 60, the shade curtain 61 is lifted, the fill light 63 is turned on for illumination, and the two sides of the wood are inspected for defects through the detector 62, and then the trigger signal is transmitted to the flattening mechanism 9 on the discharge side through the detection result, so that the action flattens the inspected wood again on the conveyor belt 5, and then marks it. When the wood is detected to have defects, the cylinder 65 at the front of the connecting bracket 64 is started, and the corresponding marking head 66 is driven by the cylinder 65 to move and contact the wood, so that the paint is applied to the wood to mark it as unqualified; when the wood is detected to have no defects, the cylinder 65 at the rear of the connecting bracket 64 is started, and the corresponding marking head 66 is driven by the cylinder 65 to move and contact the wood, so that the paint is applied to the wood to mark it as qualified.

[0047] After marking, the cylinder 65 operates in the reverse direction, so that the marking head 66 moves in the reverse direction and resets, and the flat pressing mechanism 9 resets at the same time, releasing the wood, so that the wood continues to be transported under the transmission of the conveyor belt 5 on the discharge side.

[0048] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A device for detecting defects in wood materials for furniture production, comprising a connecting frame (1) as a bearing body, a detecting mechanism (6) for detecting whether the wood has defects is provided on the connecting frame (1), and feeding mechanisms are provided on both sides of the detecting mechanism (6); the device is characterized in that: The detection mechanism (6) comprises a detection box (60) fixed on the connection frame (1); the detection box (60) is connected to a blackout curtain (61) on both the inlet and outlet sides; a detector (62) is arranged inside the detection box (60); both upper and lower sides of the detection box (60) are connected to fill light (63); the detector (62) acquires images of both sides of the wood and performs defect judgment on the images; the detection box (60) is provided with a connection bracket (64) fixed on the connection frame (1) on the outlet side of the wood; the connection bracket (64) is connected to a cylinder (65); the telescopic ends of the cylinder (65) are connected to marking heads (66); the marking heads (66) are externally connected to pigments through a feed pipe.

2. The device for detecting defects in wood materials for furniture production according to claim 1, characterized in that: The connecting frame (1) is provided with an adjustment mechanism (7) for centering the wood, the adjustment mechanism (7) comprising a fixed support frame (70), a double-axis motor (71), a screw (72), a movable frame (73) and a guide rail (74); wherein the fixed support frame (70) and the guide rail (74) are arranged in parallel on the connecting frame (1), the fixed support frame (70) is connected to the double-axis motor (71), both output shafts of the double-axis motor (71) are connected to the screw (72), the screw (72) is rotatably connected to the fixed support frame (70), the screw (72) is threadedly connected to one leg of the movable frame (73), and the other leg of the movable frame (73) is slidably arranged on the guide rail (74).

3. The device for detecting defects in wood materials for furniture production according to claim 2, characterized in that: The movable frame (73) is provided with a roller (731) that can rotate at the original position.

4. The device for detecting defects in wood materials for furniture production according to claim 2, characterized in that: The feeding mechanism uses a conveyor belt (5) to transport the wood.

5. The device for detecting defects in wood materials for furniture production according to claim 4, characterized in that: The feeding side of the detection box (60) is provided with a flattening mechanism (9) on the regulating mechanism (7); The flattening mechanism (9) comprises a connecting and fixing frame (90), an in-position sensor (91), a hydraulic cylinder (92), a connecting and fixing rod (93), a rack (94), a gear (95), a connecting and supporting frame (96), a guide roller frame (97) and a spring (98); the outer side of the moving frame (73) is connected to the connecting and fixing frame (90), the inner side of the connecting and fixing frame (90) is connected to the in-position sensor (91), the outer side is connected to the hydraulic cylinder (92), and the telescopic end of the hydraulic cylinder (92) is connected to the connecting and fixing rod ( 93), the connecting and fixing rod (93) is slidably connected to the adjacent connecting and fixing frame (90), the upper side of the connecting and fixing rod (93) is connected to a rack (94), the upper side of the connecting and fixing frame (90) is rotatably connected to a connecting support frame (96), the lower part of the connecting support frame (96) is connected to a gear (95), the gear (95) and the rack (94) are meshed with each other, the upper part of the connecting support frame (96) is slidably connected to a guide roller frame (97), and a spring (98) is connected to the guide roller frame (97) and the connecting support frame (96).

6. The device for detecting defects in wood materials for furniture production according to claim 5, characterized in that: An adjustment mechanism (7) is also provided on the discharge side of the detection box (60) near the marking head (66).

7. The device for detecting defects of wood materials for furniture production according to any one of claims 2 to 6, characterized in that: A cleaning mechanism (8) is provided on the feeding side of the detection box (60), and the cleaning mechanism (8) comprises a fixed bracket (80), a cleaning nozzle (81) and a shielding frame (82). The fixed bracket (80) is connected to the left side of the right part of the connecting frame (1), and the fixed bracket (80) is folded. The cleaning nozzle (81) is connected to the fixed bracket (80). The movable frames (73) on the feeding side are connected to the shielding frames (82) on the sides away from each other, and the shielding frames (82) are in contact with the cleaning nozzle (81).

Images