Printing quality detection device

Abstract

The invention relates to the technical field of printed matter quality detection, in particular to a printing quality detection device which comprises a conveying mechanism, a detection mechanism is installed on the conveying mechanism, and the detection mechanism comprises a first U-shaped frame and a second U-shaped frame; a third camera is installed on the inner top face of the first U-shaped frame, a first camera and a fourth camera are installed on the two inner sides of the first U-shaped frame respectively, a second camera is installed on the inner bottom face of the second U-shaped frame, and a front-back detection assembly is installed on the top face of the first U-shaped frame; two limiting mechanisms which are symmetrically distributed are arranged in the U-shaped frame I; when the packaging box moves to the position under the third camera under the guiding effect of the limiting mechanism, the third camera, the second camera, the first camera and the fourth camera detect the corresponding side faces of the packaging box, and meanwhile the front and back detection assembly detects the front side and the back side of the packaging box. The six faces of the packaging box can be detected at the same time at the vertical detection angle, and the detection efficiency and the accuracy of the detection result are improved.

Description

Technical Field

[0001] The invention relates to the technical field of printed matter quality detection, in particular to a printing quality detection device. Background Art

[0002] Currently, all six sides of packaging boxes are usually fully printed, which can effectively enhance brand value, provide key information, ensure compliance with market and legal regulations, and thus enhance the overall competitiveness of the product. After the packaging box is printed, it is particularly important to test the printing quality. This testing process can ensure that the printing effect on each side meets high standards, avoid possible defects or inconsistencies, thereby maintaining the brand image and enhancing consumer trust and satisfaction. Through strict printing quality testing, the performance of the product in the market can be guaranteed and the sustainable development of the enterprise can be promoted.

[0003] Existing packaging box printing quality inspection equipment usually includes a conveying structure, on which a detection camera is installed (generally, detection cameras are installed directly above the conveying structure and on both sides). When in use, the packaging box is placed on the conveying mechanism, and the conveying mechanism continues to transport the packaging box. During the process, the packaging box passes by the camera, thereby completing the printing quality inspection of the packaging box.

[0004] However, the detection equipment provided by the above patent still has the following deficiencies during use: During the transportation process, the sides of the packaging box are prone to deviation from the transportation direction. When passing the side detection camera, the camera and the side of the packaging box are not perpendicular, and the image may be deformed due to the perspective effect. This distortion will cause part of the actual printed content to be blurred or distorted, reducing the accuracy of recognition.

[0005] The bottom surface of the packaging box is in contact with the conveying structure, and it is difficult to complete the inspection of all surfaces in a single inspection process. Usually, a secondary placement inspection is required, which reduces the inspection efficiency. Summary of the invention

[0006] The object of the present invention is to provide a printing quality detection device to solve the problems raised in the above background technology.

[0007] The purpose of the present invention can be achieved through the following technical solutions: A printing quality inspection device comprises a conveying mechanism, on which a detection mechanism is fixedly mounted, wherein the detection mechanism comprises a U-shaped frame 1 fixedly mounted at the middle of the top surface of the conveying mechanism and a U-shaped frame 2 fixedly mounted at the middle of the bottom surface of the conveying mechanism, wherein the U-shaped frame 2 is located directly below the U-shaped frame 1; The U-shaped frame 1 is provided with a camera 3 installed in the middle of the inner top surface, the U-shaped frame 1 is provided with a camera 1 and a camera 4 installed in the middle of the two inner side surfaces, the U-shaped frame 2 is provided with a camera 2 installed in the middle of the inner bottom surface, and the top surface of the U-shaped frame 1 is provided with a front and rear detection assembly fixedly installed; The bottom surface of the U-shaped frame 2 is provided with two movable grooves symmetrically distributed about the camera 2 in the length direction, an adjustment component is fixedly installed on the bottom surface of the U-shaped frame 2, and two symmetrically distributed limiting mechanisms are arranged in the U-shaped frame 1, and the bottom ends of the two groups of limiting mechanisms respectively pass through the two movable grooves and are transmission-connected with the adjustment component; The limiting mechanism comprises a side limiting assembly, a top limiting assembly is fixedly mounted on the side limiting assembly, and a conveying assembly is mounted on the side of the side limiting assembly; A control module is also installed on the top surface of the U-shaped frame 1, and the front and rear detection components, the adjustment components, the conveying components, the side limit components and the transmission mechanism are electrically connected to the control module.

[0008] Further, the conveying mechanism includes two parallel side plates, a plurality of conveying rollers are installed in a reverse array along the length of the two side plates, a pulley transmission box for sequentially connecting the plurality of conveying rollers is arranged on the outer side of one side plate, and a driving motor for driving the pulley transmission box is installed at the input end of the pulley transmission box, and the driving motor is electrically connected to the control module; The bottom surface of the side plate is provided with a plurality of supporting feet arranged in an array along the length direction thereof; The U-shaped frame 1 is fixedly installed between the top surfaces of the two side panels, and the U-shaped frame 2 is fixedly installed between the bottom surfaces of the two legs. The portion between the two side panels aligned with the U-shaped frame 1 is an open structure.

[0009] Further, the adjustment component includes a motor 1 electrically connected to the control module and two fixing seats, the two fixing seats are fixedly installed at the two end positions of the bottom surface of the second U-shaped frame respectively, a bidirectional screw is rotatably installed between the two fixing seats, and two sliding rods symmetrically arranged about the bidirectional screw are fixedly connected between the two fixing seats, and two sliding seats symmetrically distributed about the middle position of the bidirectional screw are installed on the outer periphery of the bidirectional screw in a through-threaded manner, and the sliding seat and the sliding rod are through-slidingly connected; The motor 1 is fixedly mounted on the outer side of a fixed seat, and one end of the bidirectional screw rod close to the motor 1 rotates through the fixed seat at the corresponding position and is fixedly connected to the output shaft end of the motor 1; A group of side limit assemblies are respectively fixedly connected to the top surfaces of the two slide seats.

[0010] Further, the side limit assembly includes a support plate vertically fixedly mounted on the top surface of the slide seat, the top end of the support plate passes through the movable slot at the corresponding position and extends to the top of the side plate, the top end of the support plate is fixedly mounted with a side limit plate arranged parallel to the side plate, the side limit plate is located above the conveying roller, and the bottom surface of the side limit plate is in sliding contact with the conveying roller; A plurality of balls are evenly embedded on the inner side of the side limit plate, and a guide assembly is installed at one end of the side limit plate close to the feeding end of the conveying mechanism, and the guide assembly is electrically connected to the control module; The support plate is in sliding contact with both sides of the movable groove.

[0011] Furthermore, the conveying assembly includes a second motor, a first pulley and a strip plate, wherein the strip plate is fixedly mounted on the support plate at a position close to the top end, the strip plate is arranged parallel to the side limit plate, and the second pulley is rotatably mounted on the inner side surface of the strip plate at the middle position and both ends; The pulley 1 is rotatably mounted on the inner side surface of the support plate, and the pulley 1 is located directly below the middle pulley 2. A belt is installed between the pulley 1 and the three pulleys 2, and the top surface of the belt is flush with the bottom surface of the side limit plate. The second motor is fixedly mounted on the outer side of the support plate, the second motor is coaxial with the pulley, the output shaft end of the second motor rotates through the support plate and is fixedly connected to the first pulley, and the second motor is electrically connected to the control module.

[0012] Furthermore, the guide assembly includes a guide plate 1 obliquely installed at the end of the side limit plate, and the two ends of the guide plates 1 away from the side limit plate extend outwardly; An avoidance groove is provided on the side surface of the guide plate 1, and a correction component is installed between the avoidance groove and the side limit plate.

[0013] Further, the correction component includes a U-shaped groove opened at the end of the side limit plate, the U-shaped groove is aligned with and penetrates the avoidance groove, and a camera 6 is fixedly installed between the top and bottom surfaces of the U-shaped groove; It also includes a correction plate and a mounting seat fixedly mounted on the outer side of the side limit plate, and a hinge seat 1 is fixedly mounted on the side of the mounting seat at an end away from the side limit plate; One end of the correction plate is connected to the camera 6 in a through-type rotational connection, a hinge seat 2 is fixedly installed on the side of the correction plate close to the side plate, an electric push rod is installed between the hinge seat 2 and the hinge seat 1, the electric push rod is electrically connected to the control module, and the electric push rod is hinged to the correction plate and the mounting seat through the hinge seat 2 and the hinge seat 1 respectively; When the electric push rod is in the extreme extension state, the correction plate is parallel to the side limit plate, and the inner side surface of the correction plate is flush with the inner side surface of the side limit plate.

[0014] Furthermore, the top surface limiting assembly includes two electric telescopic rods, and the two ends of the top surface of the side limiting plate are fixedly installed with the two vertically arranged electric telescopic rods, and an upper limit plate is fixedly installed between the top ends of the two electric telescopic rods, and the upper limit plate is located directly above the conveying assembly; A second guide plate inclined upward is fixedly mounted on one end of the upper limit plate close to the guide assembly.

[0015] Further, the front and rear detection components include an electric telescopic rod 1 fixedly mounted at the center of the top surface of the U-shaped frame 1, the electric telescopic rod 1 is electrically connected to the control module, the telescopic end of the electric telescopic rod 1 is fixedly mounted with a mounting plate arranged parallel to the side plate, both ends of the bottom surface of the mounting plate are fixedly mounted with vertically arranged connecting rods, the bottom end of the connecting rod slides through the top surface of the U-shaped frame 1 and then is fixedly mounted with a mounting plate, and the opposite sides of the two mounting plates are respectively mounted with a camera 5 and a camera 6; A flattening assembly is installed between the two connecting rods.

[0016] Furthermore, the flattening assembly includes a pressure strip disposed between the two connecting rods, and two ends of the pressure strip are respectively connected to the peripheries of the two connecting rods in a penetrating sliding manner; Springs are fixedly installed at both ends of the top surface of the pressure strip, and the springs are sleeved on the periphery of the corresponding positions. The top of the spring is fixedly connected to the inner top surface of the U-shaped frame.

[0017] Beneficial effects of the present invention: 1. During the transportation of the packaging box, the packaging box enters between the U-shaped frame 1 and the U-shaped frame 2 under the guidance of the guide component. At this time, the packaging box is supported by two groups of conveying components. When the packaging box is directly below the camera 3, the control module controls the conveying mechanism to stop running, and controls the front and rear detection components to descend to detect the front and back sides of the packaging box. At the same time, the camera 3 detects the top surface of the packaging box, the camera 2 detects the bottom surface of the packaging box, and the camera 1 and the camera 4 detect the two sides of the packaging box respectively, so that the six sides of the packaging box can be synchronously detected at the same time, which effectively improves the detection efficiency.

[0018] 2. The present invention makes each side of the packaging box perpendicular to the detection angle between the cameras at the corresponding positions through the coordinated arrangement of the side limit assembly and the top limit assembly, thereby improving the accuracy of the detection result.

[0019] 3. In the correction component, the two electric push rods perform synchronous telescopic movements, so that the electric push rods perform periodic rotation movements about camera 6. The periodic rotation of the two correction plates can actively correct the packaging box, thereby ensuring that the packaging box can smoothly enter between the two side limit plates, thereby improving the working stability of the present invention.

[0020] 4. The synchronous downward sliding of the two connecting rods drives the camera five and the camera six to detect the front and back of the packaging box. During the process, the pressure strip is limited and blocked on the top surface of the packaging box, and the spring is in a compressed state. The restoring elastic force of the spring causes the pressure strip to elastically press the joint between the two movable plates on the top surface of the packaging box, so that the top surface of the packaging box is in a stable and flat state, thereby improving the detection accuracy of the top surface of the packaging box. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art description are briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative work. Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention; Figure 2 yes Figure 1 A three-dimensional schematic diagram from another angle; Figure 3 yes Figure 2 A magnified view of part B; Figure 4 yes Figure 1 A magnified view of part A; Figure 5 It is a three-dimensional schematic diagram of the connection relationship between the guide assembly and the side limit plate in the present invention; Figure 6 yes Figure 5 Enlarged view of part C; Figure 7 It is a three-dimensional schematic diagram of the installation relationship between the conveying assembly and the support plate in the present invention; Figure 8 yes Figure 7 A magnified view of part D in the middle; Fig. 9 It is a three-dimensional schematic diagram of the connection relationship between the front and rear detection components and the flattening component in the present invention; Fig.10 It is a schematic diagram of the structure of the correction component before the packaging box is corrected in the present invention; Fig.11 It is a schematic diagram of the structure after the packaging box is corrected by the correction component in the present invention; The reference numerals in the figures are as follows: 1-side plate, 2-supporting foot, 3-transmission roller, 4-pulley transmission box, 5-U-shaped frame 1, 6-control module, 7-front and rear detection components, 8-camera 1, 9-limiting mechanism, 10-camera 3, 11-U-shaped frame 2, 12-fixed seat, 13-motor 1, 14-sliding seat, 15-bidirectional screw rod, 16-sliding rod, 17-movable groove, 18-support plate, 19-pulley 1, 20-belt, 21-pulley 2, 22-strip board, 23-side limit plate, 24-ball, 25-electric Telescopic rod two, 26-upper limit plate, 27-guide plate two, 28-camera four, 29-U-shaped groove, 30-correction plate, 31-avoidance groove, 32-mounting seat, 33-electric push rod, 34-articulated seat one, 35-articulated seat two, 36-guide plate one, 37-motor two, 38-electric telescopic rod one, 39-mounting plate, 40-connecting rod, 41-mounting plate, 42-packing box, 43-camera six, 44-camera two, 45-pressure strip, 46-spring, 47-camera five. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Embodiment 1: See also Figures 1 to 11 In an embodiment of the present invention, a printing quality inspection device includes a conveying mechanism, a detection mechanism is fixedly installed on the conveying mechanism, and the detection mechanism includes a U-shaped frame 1 5 fixedly installed at the middle position of the top surface of the conveying mechanism and a U-shaped frame 2 11 fixedly installed at the middle position of the bottom surface of the conveying mechanism, and the U-shaped frame 2 11 is located directly below the U-shaped frame 1 5; A camera 3 10 is installed in the middle of the inner top surface of the U-shaped frame 1 5, a camera 1 8 and a camera 4 28 are installed in the middle of the two inner side surfaces of the U-shaped frame 1 5, a camera 2 44 is installed in the middle of the inner bottom surface of the U-shaped frame 2 11, and a front and rear detection component 7 is fixedly installed on the top surface of the U-shaped frame 1 5; The bottom surface of the U-shaped frame 11 is provided with two movable grooves 17 symmetrically distributed about the camera 44 in the length direction, and an adjustment component is fixedly installed on the bottom surface of the U-shaped frame 11. Two symmetrically distributed limiting mechanisms 9 are provided in the U-shaped frame 1 5. The bottom ends of the two sets of limiting mechanisms 9 pass through the two movable grooves 17 respectively and are transmission-connected with the adjustment component. The limiting mechanism 9 includes a side limiting assembly, on which a top limiting assembly is fixedly mounted, and a conveying assembly is mounted on the side of the side limiting assembly; A control module 6 is also installed on the top surface of the U-shaped frame 5, and the front and rear detection components 7, the adjustment components, the conveying components, the side limit components and the transmission mechanism are electrically connected to the control module 6.

[0024] The transmission mechanism includes two parallel side plates 1, a plurality of transmission rollers 3 are installed in a reverse array along the length of the two side plates 1, a pulley transmission box 4 for sequentially transmitting and connecting the plurality of transmission rollers 3 is arranged on the outer side of one side plate 1, and a driving motor for driving the pulley transmission box 4 is installed at the input end of the pulley transmission box 4, and the driving motor is electrically connected to the control module 6; The bottom surface of the side panel 1 is provided with a plurality of supporting legs 2 arranged in an array along its length direction; A U-shaped frame 1 5 is fixedly installed between the top surfaces of the two side panels 1, and a U-shaped frame 2 11 is fixedly installed between the bottom surfaces of the two legs 2. The portion between the two side panels 1 aligned with the U-shaped frame 1 5 is an open structure.

[0025] The adjustment component includes a motor 13 electrically connected to the control module 6 and two fixed seats 12, the two fixed seats 12 are respectively fixedly installed at the two end positions of the bottom surface of the U-shaped frame 11, a bidirectional screw rod 15 is rotatably installed between the two fixed seats 12, and two slide rods 16 symmetrically arranged about the bidirectional screw rod 15 are fixedly connected between the two fixed seats 12, and two slide seats 14 symmetrically distributed about the middle position of the bidirectional screw rod 15 are installed on the outer periphery of the bidirectional screw rod 15 in a through-threaded manner, and the slide seat 14 and the slide rod 16 are through-slidingly connected; The motor 13 is fixedly mounted on the outer side of a fixed seat 12, and the bidirectional screw 15 is rotated at one end close to the motor 13 to penetrate the fixed seat 12 at the corresponding position and then fixedly connected to the output shaft end of the motor 13; A set of side limit assemblies are respectively fixedly connected to the top surfaces of the two slide seats 14 .

[0026] By setting the adjustment component, the distance between the two sets of side limit components can be adjusted within a certain range, so that it can adapt to packaging boxes 42 of different sizes, thereby improving the applicability of the present invention.

[0027] The side limit assembly includes a support plate 18 vertically fixedly mounted on the top surface of the slide 14, the top of the support plate 18 passes through the movable slot 17 at the corresponding position and extends to the top of the side plate 1, and the top of the support plate 18 is fixedly mounted with a side limit plate 23 arranged parallel to the side plate 1, the side limit plate 23 is located above the conveying roller 3, and the bottom surface of the side limit plate 23 is in sliding contact with the conveying roller 3; A plurality of balls 24 are evenly embedded on the inner side of the side limit plate 23. The arrangement of the balls 24 can reduce the friction between the packaging box 42 and the side limit plate 23, thereby improving the smoothness of the movement of the packaging box 42 between the two side limit plates 23; a guide assembly is installed at one end of the side limit plate 23 close to the feeding end of the conveying mechanism, and the guide assembly is electrically connected to the control module 6; The support plate 18 is in sliding contact with both sides of the movable groove 17 .

[0028] The conveying assembly includes a second motor 37, a pulley 19 and a strip board 22. The strip board 22 is fixedly mounted on the support plate 18 near the top. The strip board 22 is arranged parallel to the side limit plate 23. The inner side surface of the strip board 22 is rotatably mounted with a pulley 21 at the middle position and both ends. The pulley 19 is rotatably mounted on the inner side of the support plate 18, and the pulley 19 is located directly below the middle pulley 21. A belt 20 is installed between the pulley 19 and the three pulleys 21, and the top surface of the belt 20 is flush with the bottom surface of the side limit plate 23. Motor 2 37 is fixedly mounted on the outer surface of the support plate 18 , and is coaxial with pulley 1 19 . The output shaft end of motor 2 37 rotates through the support plate 18 and is fixedly connected to pulley 1 19 . Motor 2 37 is electrically connected to the control module 6 .

[0029] The guide assembly includes a guide plate 36 obliquely installed at the end of the side limit plate 23, and the two guide plates 36 extend outwardly from one end of the side limit plate 23; An avoidance groove 31 is provided on the side surface of the guide plate 1 36 , and a correction component is installed between the avoidance groove 31 and the side limit plate 23 .

[0030] The top surface limiting assembly includes an electric telescopic rod 25, and both ends of the top surface of the side limiting plate 23 are fixedly installed with vertically arranged electric telescopic rods 25, and an upper limit plate 26 is fixedly installed between the top ends of the two electric telescopic rods 25, and the upper limit plate 26 is located directly above the conveying assembly; A second guide plate 27 inclined upward is fixedly mounted on one end of the upper limit plate 26 close to the guide assembly.

[0031] Among them, the front and rear detection components include an electric telescopic rod 38 fixedly installed at the center position of the top surface of the U-shaped frame 5, the electric telescopic rod 38 is electrically connected to the control module 6, the telescopic end of the electric telescopic rod 38 is fixedly installed with a mounting plate 39 arranged parallel to the side plate 1, and the two ends of the bottom surface of the mounting plate 39 are fixedly installed with vertically arranged connecting rods 40, and the bottom end of the connecting rod 40 slides through the top surface of the U-shaped frame 5 and then fixedly installed with a mounting plate 41, and the opposite sides of the two mounting plates 41 are respectively installed with a camera 5 47 and a camera 6 43; A flattening assembly is installed between the two connecting rods 40 .

[0032] During the conveying process of existing inspection equipment, the side of the box is prone to deviation from the conveying direction. When passing the side inspection camera, the camera and the side of the box are not perpendicular, and the image may be deformed due to the perspective effect. This distortion will cause the actual printed content to be blurred or distorted, reducing the accuracy of recognition. In addition, the bottom surface of the box is in contact with the conveying structure, making it difficult to complete the inspection of all sides in a single inspection process. Usually, a second placement inspection is required, which reduces the inspection efficiency.

[0033] The printing quality detection device provided by the present invention is used: The feeding end of the packaging box 42 is placed on the conveying mechanism. During the conveying process, the packaging box 42 will pass between the U-shaped frame 1 5 and the U-shaped frame 2 11; Before the detection work, the control module 6 is used to set the control adjustment component to adjust the distance between the two sets of side limit components to adapt to the length or width of the packaging box 42; at the same time, the control module 6 is used to set the working height of the top surface limit component to adapt to the height of the packaging box 42; During the conveying process of the packaging box 42, the packaging box 42 enters between the U-shaped frame 1 5 and the U-shaped frame 2 11 under the guidance of the guide assembly. At this time, the packaging box 42 is supported by two groups of conveying assemblies. When the packaging box 42 is directly below the camera 3 10, the control module 6 controls the conveying mechanism to stop running, and controls the front and rear detection assemblies 7 to descend to detect the front and rear faces of the packaging box 42. At the same time, the camera 3 10 detects the top surface of the packaging box 42, the camera 2 44 detects the bottom surface of the packaging box 42, and the camera 1 8 and the camera 4 28 respectively detect the two sides of the packaging box 42, so that the six faces of the packaging box 42 can be synchronously detected at the same time, which effectively improves the detection efficiency. Furthermore, by cooperating with the side limiting assembly and the top limiting assembly, each side of the packaging box 42 is perpendicular to the detection angle between the cameras at the corresponding positions, thereby improving the accuracy of the detection result.

[0034] In the conveying mechanism, the packaging box 42 is placed on the conveying rollers 3, and the rotation of multiple conveying rollers 3 conveys the packaging box 42. When placing the packaging box 42, it should be noted that the joint of the top surface of the packaging box 42 should be parallel to the side panel 1, and it should be placed as centered as possible between the two side panels 1, so as to ensure the smooth entry of the packaging box 42 between the two side limit plates 23, and ensure the effectiveness of the top surface limit component in limiting the packaging box 42.

[0035] After the packing box 42 enters between the two side limit plates 23, the two sides of the packing box 42 are respectively in contact with the inner side surfaces of the two side limit plates 23, so that the left and right sides of the packing box 42 can be parallel to the two sides of the U-shaped frame 5. When the packing box 42 gradually enters the U-shaped frame 5, the bottom surface of the packing box 42 gradually loses the support provided by the conveying rollers 3, and is supported by two sets of conveying components on both sides of the bottom surface; Specifically, in the conveying assembly, the second motor 37 drives the first pulley 19 to rotate, and cooperates with the second pulley 21 to make the conveying direction of the belt 20 consistent with the conveying direction of the conveying roller 3. When the packaging box 42 is directly below the third camera 10, the packaging box 42 is completely supported by the two belts 20. At this time, the control module 6 controls the second motor 37 to stop running, so that the packaging box 42 is guaranteed to be in a position state directly below the third camera 10; The top surface of the packaging box 42 is usually in an unpackaged state, so the two movable plates on the top surface of the packaging box 42 are normally in an inclined state, that is, there is an angle between the two movable plates and the top surface, and the camera 3 10 cannot detect at the best detection angle at this time; the above problem can be solved by setting the top surface limit assembly in the present invention. Specifically, when the packaging box 42 enters between the two side limit plates 23, the positions on both sides of the top surface of the packaging box 42 will be limited below the two upper limit plates 26, so that the two movable plates on the top surface of the packaging box 42 are in a flush state, so that the camera 3 10 can detect the top surface of the packaging box 42 at a vertical angle; When the packing box 42 is directly below the camera three 10, the camera three 10, the camera two 44, the camera one 8 and the camera four 28 detect the corresponding sides of the packing box 42, and at the same time 6 controls the electric telescopic rod one 38 to retract until the camera five 47 and the camera six 43 are respectively located at the front and back sides of the packing box 42, thereby realizing the simultaneous and vertical detection angle detection of the six sides of the packing box 42, thereby improving the detection efficiency and the accuracy of the detection results.

[0036] After the detection is completed, the control module 6 controls the front and rear detection components 7 to reset, and then moves the next packaging box 42 to the bottom of the camera 3 10, and repeats this process to achieve continuous detection.

[0037] The control module 6 may use a PLC (Programmable Logic Controller). The technology of using PLC to control the operation of the motor, the electric telescopic rod and the electric push rod belongs to the scope of the prior art. This control method has been widely used in the control systems of industrial automation, robots and various mechanical equipment.

[0038] Among them, detecting printing quality by camera also belongs to the prior art. Usually, the camera connects the collected image to a dedicated image processing computer or controller through USB, Ethernet or other interfaces for subsequent data processing, analysis and quality evaluation.

[0039] Embodiment 2: See also Figure 1 , Figures 4 to 6 , Fig.10 and Fig.11 On the basis of Example 1, the correction component includes a U-shaped groove 29 opened at the end of the side limit plate 23, the U-shaped groove 29 is aligned with and penetrates the avoidance groove 31, and a camera 43 is fixedly installed between the top and bottom surfaces of the U-shaped groove 29; It also includes a correction plate 30 and a mounting seat 32 fixedly mounted on the outer side of the side limit plate 23, and a hinge seat 34 is fixedly mounted on the side of the mounting seat 32 at an end away from the side limit plate 23; One end of the correction plate 30 is connected to the camera six 43 in a through-type rotational manner. A hinge seat two 35 is fixedly installed on the side of the correction plate 30 close to the side plate 1. An electric push rod 33 is installed between the hinge seat two 35 and the hinge seat one 34. The electric push rod 33 is electrically connected to the control module 6. The electric push rod 33 is hinged to the correction plate 30 and the mounting seat 32 through the hinge seat two 35 and the hinge seat one 34 respectively. When the electric push rod 33 is in the extreme extended state, the correction plate 30 is parallel to the side limit plate 23 , and the inner side surface of the correction plate 30 is flush with the inner side surface of the side limit plate 23 .

[0040] When the packing box 42 enters between the two side limit plates 23, the packing box 42 usually does not enter in a completely aligned state, so the following may occur: Fig.10 In the entry state shown, the packaging box 42 is blocked between the two guide plates 36; In this embodiment, the control module 6 is used to control the two electric push rods 33 to perform synchronous telescopic movements, so that the electric push rods 33 perform periodic rotation movements about the camera six 43. The periodic rotation of the two correction plates 30 can actively correct the packaging box 42, thereby ensuring that the packaging box 42 can smoothly enter between the two side limit plates 23, thereby improving the working stability of the present invention.

[0041] Embodiment 3: See also Fig. 9 On the basis of Example 2, the flattening assembly includes a pressure strip 45 disposed between the two connecting rods 40, and the two ends of the pressure strip 45 are respectively connected to the periphery of the two connecting rods 40 in a penetrating sliding manner; Springs 46 are fixedly installed at both ends of the top surface of the pressure strip 45. The springs 46 are sleeved on the periphery of 49 at the corresponding positions. The top of the spring 46 is fixedly connected to the inner top surface of the U-shaped frame 5.

[0042] After the packaging box 42 moves to the position directly below the camera 3 10, the two sets of top surface limiting components limit the two movable plates on the top surface of the packaging box 42 at both sides of the top surface of the packaging box 42, so that the top surface of the packaging box 42 tends to be flat. However, the cardboard material has a certain toughness, and in order not to affect the comprehensiveness of the camera 3 10 on the top surface of the packaging box 42, the width of the upper limit plate 26 is selected to be a small value. Therefore, the butt joint side between the two movable plates on the top surface of the packaging box 42 may be warped, resulting in the top surface of the packaging box 42 still being uneven after limiting, which has an adverse effect on the detection result. In this embodiment, the synchronous downward sliding of the two connecting rods 40 drives the camera five 47 and the camera six 43 to detect the front and back of the packaging box 42. During the process, the pressure strip 45 is limited and blocked on the top surface of the packaging box 42, and the spring 46 is in a compressed state. The restoring elastic force of the spring 46 causes the pressure strip 45 to elastically press the joint between the two movable plates on the top surface of the packaging box 42, so that the top surface of the packaging box 42 is in a stable and flat state, thereby improving the detection accuracy of the top surface of the packaging box 42.

[0043] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and 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, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A printing quality inspection device, comprising a transmission mechanism, on which a detection mechanism is fixedly mounted, characterized in that: The detection mechanism comprises a U-shaped frame 1 (5) fixedly mounted at the middle position of the top surface of the conveying mechanism and a U-shaped frame 2 (11) fixedly mounted at the middle position of the bottom surface of the conveying mechanism, wherein the U-shaped frame 2 (11) is located directly below the U-shaped frame 1 (5); A camera 3 (10) is installed in the middle of the inner top surface of the U-shaped frame 1 (5), a camera 1 (8) and a camera 4 (28) are installed in the middle of the two inner side surfaces of the U-shaped frame 1 (5), a camera 2 (44) is installed in the middle of the inner bottom surface of the U-shaped frame 2 (11), and a front and rear detection assembly (7) is fixedly installed on the top surface of the U-shaped frame 1 (5); The bottom surface of the U-shaped frame 2 (11) is provided with two movable grooves (17) symmetrically distributed about the camera 2 (44) in the length direction, an adjustment component is fixedly installed on the bottom surface of the U-shaped frame 2 (11), and two symmetrically distributed limiting mechanisms (9) are arranged in the U-shaped frame 1 (5), and the bottom ends of the two groups of limiting mechanisms (9) respectively pass through the two movable grooves (17) and are transmission-connected with the adjustment component; The limiting mechanism (9) comprises a side limiting assembly, a top limiting assembly is fixedly mounted on the side limiting assembly, and a conveying assembly is mounted on the side of the side limiting assembly; A control module (6) is also installed on the top surface of the U-shaped frame 1 (5), and the front and rear detection components (7), the adjustment component, the conveying component, the side limit component and the transmission mechanism are electrically connected to the control module (6).

2. A printing quality inspection device according to claim 1, characterized in that: The conveying mechanism comprises two parallel side plates (1), a plurality of conveying rollers (3) are mounted in a reverse array along the length of the two side plates (1), a pulley transmission box (4) is mounted on the outer side of one side plate (1) for sequentially transmitting and connecting the plurality of conveying rollers (3), and a driving motor for driving the pulley transmission box (4) is mounted at the input end of the pulley transmission box (4), and the driving motor is electrically connected to a control module (6); The bottom surface of the side plate (1) is provided with a plurality of supporting feet (2) arranged in an array along its length direction; The U-shaped frame 1 (5) is fixedly mounted between the top surfaces of the two side panels (1), and the U-shaped frame 2 (11) is fixedly mounted between the bottom surfaces of the two legs (2), and the portion between the two side panels (1) aligned with the U-shaped frame 1 (5) is an open structure.

3. A printing quality inspection device according to claim 2, characterized in that: The adjustment component comprises a motor 1 (13) electrically connected to the control module (6) and two fixed seats (12), the two fixed seats (12) being fixedly mounted at two end positions of the bottom surface of the U-shaped frame 2 (11), a bidirectional screw rod (15) being rotatably mounted between the two fixed seats (12), and two sliding rods (16) symmetrically arranged with respect to the bidirectional screw rod (15) being fixedly connected between the two fixed seats (12), two sliding seats (14) symmetrically distributed with respect to the middle position of the bidirectional screw rod (15) being installed with through-threads on the outer periphery of the bidirectional screw rod (15), and the sliding seats (14) and the sliding rods (16) being through-slidingly connected; The motor 1 (13) is fixedly mounted on the outer side of a fixed seat (12), and one end of the bidirectional screw rod (15) close to the motor 1 (13) rotates through the fixed seat (12) at the corresponding position and is fixedly connected to the output shaft end of the motor 1 (13); A set of side limit assemblies is respectively fixedly connected to the top surfaces of the two slide seats (14).

4. A printing quality inspection device according to claim 3, characterized in that: The side limit assembly comprises a support plate (18) vertically fixedly mounted on the top surface of the slide seat (14), the top end of the support plate (18) passes through a movable slot (17) at a corresponding position and then extends to the top of the side plate (1), a side limit plate (23) arranged parallel to the side plate (1) is fixedly mounted on the top end of the support plate (18), the side limit plate (23) is located above the conveying roller (3), and the bottom surface of the side limit plate (23) is in sliding contact with the conveying roller (3); A plurality of balls (24) are evenly embedded on the inner side surface of the side limit plate (23); a guide component is installed at one end of the side limit plate (23) close to the feeding end of the conveying mechanism, and the guide component is electrically connected to the control module (6); The support plate (18) is in sliding contact with two sides of the movable groove (17).

5. A printing quality inspection device according to claim 4, characterized in that: The conveying assembly comprises a second motor (37), a first pulley (19) and a strip plate (22), wherein the strip plate (22) is fixedly mounted on the support plate (18) at a position close to the top end, the strip plate (22) is arranged parallel to the side limit plate (23), and a second pulley (21) is rotatably mounted on the inner side surface of the strip plate (22) at the middle position and both end positions; The pulley one (19) is rotatably mounted on the inner side surface of the support plate (18), and the pulley one (19) is located directly below the middle pulley two (21). A belt (20) is installed between the pulley one (19) and the three pulleys two (21), and the top surface of the belt (20) is flush with the bottom surface of the side limit plate (23); The second motor (37) is fixedly mounted on the outer surface of the support plate (18), the second motor (37) is coaxial with the first pulley (19), the output shaft end of the second motor (37) rotates through the support plate (18) and is fixedly connected to the first pulley (19), and the second motor (37) is electrically connected to the control module (6).

6. A printing quality inspection device according to claim 4, characterized in that: The guide assembly comprises a guide plate one (36) obliquely mounted on the end of the side limit plate (23), and one end of the two guide plates one (36) away from the side limit plate (23) extends outwardly; An avoidance groove (31) is provided on the side surface of the guide plate 1 (36), and a correction component is installed between the avoidance groove (31) and the side limit plate (23).

7. A printing quality inspection device according to claim 6, characterized in that: The correction component comprises a U-shaped groove (29) formed at the end of the side limit plate (23), the U-shaped groove (29) being aligned with and interpenetrating the avoidance groove (31), and a camera six (43) being fixedly mounted between the top and bottom surfaces of the U-shaped groove (29); It also includes a correction plate (30) and a mounting seat (32) fixedly mounted on the outer side of the side limit plate (23), wherein a hinge seat (34) is fixedly mounted on the side of the mounting seat (32) at an end away from the side limit plate (23); One end of the correction plate (30) is connected to the camera six (43) in a through-type rotational connection; a hinge seat 2 (35) is fixedly mounted on the side surface of the correction plate (30) close to the side plate (1); an electric push rod (33) is mounted between the hinge seat 2 (35) and the hinge seat 1 (34); the electric push rod (33) is electrically connected to the control module (6); the electric push rod (33) is hinged to the correction plate (30) and the mounting seat (32) through the hinge seat 2 (35) and the hinge seat 1 (34), respectively; When the electric push rod (33) is in the extreme extension state, the correction plate (30) is parallel to the side limit plate (23), and the inner side surface of the correction plate (30) is flush with the inner side surface of the side limit plate (23).

8. A printing quality inspection device according to claim 4, characterized in that: The top surface limiting assembly comprises two electric telescopic rods (25), two electric telescopic rods (25) arranged vertically are fixedly installed at both ends of the top surface of the side limiting plate (23), an upper limit plate (26) is fixedly installed between the top ends of the two electric telescopic rods (25), and the upper limit plate (26) is located directly above the conveying assembly; A second guide plate (27) inclined upward is fixedly mounted on one end of the upper limit plate (26) close to the guide assembly.

9. A printing quality inspection device according to claim 2, characterized in that: The front and rear detection components include an electric telescopic rod (38) fixedly mounted at the center of the top surface of the U-shaped frame (5), the electric telescopic rod (38) being electrically connected to the control module (6), a mounting plate (39) arranged parallel to the side plate (1) being fixedly mounted on the telescopic end of the electric telescopic rod (38), vertically arranged connecting rods (40) being fixedly mounted at both ends of the bottom surface of the mounting plate (39), the bottom end of the connecting rod (40) slidingly passing through the top surface of the U-shaped frame (5) and then fixedly mounted with a mounting plate (41), and a camera five (47) and a camera six (43) being respectively mounted on opposite sides of the two mounting plates (41); A flattening assembly is installed between the two connecting rods (40).

10. A printing quality inspection device according to claim 9, characterized in that: The flattening assembly comprises a pressure strip (45) arranged between the two connecting rods (40), and the two ends of the pressure strip (45) are respectively connected to the peripheries of the two connecting rods (40) in a penetrating sliding manner; Springs (46) are fixedly mounted at both ends of the top surface of the pressure strip (45). The springs (46) are sleeved around the periphery of (49) at the corresponding positions. The top end of the spring (46) is fixedly connected to the inner top surface of the U-shaped frame (5).

Images