Printing quality detection device

Abstract

The present invention relates to the technical field of printed matter quality inspection, and specifically to a printing quality inspection device, comprising a conveying mechanism, on which a detection mechanism is installed, the detection mechanism comprising a U-shaped frame 1 and a U-shaped frame 2; a camera 3 is installed on the inner top surface of the U-shaped frame 1, and a camera 1 and a camera 4 are installed on the two inner sides respectively, a camera 2 is installed on the inner bottom surface of the U-shaped frame 2, and a front and rear detection assembly is installed on the top surface of the U-shaped frame 1; two symmetrically distributed limiting mechanisms are provided in the U-shaped frame 1; when a packaging box moves to the point directly below the camera 3 under the guidance of the limiting mechanism, the camera 3, the camera 2, the camera 1 and the camera 4 detect the corresponding sides of the packaging box, and at the same time the front and rear detection assemblies detect the front and rear sides of the packaging box, thereby realizing the simultaneous and vertical detection angle detection of the six sides of the packaging box, thereby improving the detection efficiency and the accuracy of the detection results.

Description

Technical Field

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

[0002] Currently, packaging boxes are typically fully printed on all six sides, effectively enhancing brand value and providing key information to ensure compliance with market and legal regulations, thereby improving the product's overall competitiveness. After the packaging box has been printed, it is particularly important to conduct print quality inspections. This inspection process ensures that the printing on each side meets high standards, avoiding potential defects or inconsistencies, thereby maintaining brand image and enhancing consumer trust and satisfaction. Through rigorous print quality inspections, product performance can be guaranteed and the company's sustainable development can be promoted.

[0003] Existing packaging box printing quality inspection equipment usually includes a conveying structure with inspection cameras installed on the conveying structure (generally, inspection 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 structure continuously transports 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:

[0005] During the conveying process, the sides of the packaging box are prone to deviation from the conveying direction. When passing the side detection camera, the camera and the side of the packaging box are not perpendicular, and the image may be distorted 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.

[0006] The bottom surface of the packaging box is in contact with the conveying structure, making it difficult to complete the inspection of all surfaces in a single inspection process. Usually, a second placement inspection is required, which reduces the inspection efficiency. Summary of the Invention

[0007] The object of the present invention is to provide a printing quality inspection device to solve the problems raised in the above background technology.

[0008] The purpose of the present invention can be achieved through the following technical solutions:

[0009] A printing quality inspection device includes a conveying mechanism, wherein a detection mechanism is fixedly mounted on the conveying mechanism, wherein the detection mechanism includes a first U-shaped frame fixedly mounted in the middle of the top surface of the conveying mechanism and a second U-shaped frame fixedly mounted in the middle of the bottom surface of the conveying mechanism, wherein the second U-shaped frame is located directly below the first U-shaped frame;

[0010] Camera 3 is installed in the middle of the inner top surface of the U-shaped frame 1, camera 1 and camera 4 are installed in the middle of the two inner side surfaces of the U-shaped frame 1 respectively, camera 2 is installed in the middle of the inner bottom surface of the U-shaped frame 2, and the top surface of the U-shaped frame 1 is fixedly installed with front and rear detection components;

[0011] The bottom surface of the second U-shaped frame is provided with two movable grooves symmetrically distributed about the second camera in the longitudinal direction. An adjustment assembly is fixedly mounted on the bottom surface of the second U-shaped frame. Two symmetrically distributed limiting mechanisms are provided in the first U-shaped frame. The bottom ends of the two groups of limiting mechanisms respectively pass through the two movable grooves and are transmission-connected to the adjustment assembly.

[0012] The limiting mechanism includes 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;

[0013] A control module is also installed on the top surface of the U-shaped frame 1, and the front and rear detection components, adjustment components, conveying components, side limit components and transmission mechanism are electrically connected to the control module.

[0014] Furthermore, the conveying mechanism includes two parallel side plates, a plurality of conveying rollers are installed in an array in opposite directions along the length of the two side plates, a pulley transmission box is provided on the outer side of one side plate for sequentially transmitting and connecting the plurality of conveying rollers, and a drive motor for driving the pulley transmission box is installed at the input end of the pulley transmission box, and the drive motor is electrically connected to the control module;

[0015] 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, and the portion between the two side panels aligned with the U-shaped frame 1 is an open structure;

[0016] The bottom surface of the side plate is provided with a plurality of supporting legs arranged in an array along the length direction thereof.

[0017] Furthermore, the adjustment assembly includes a motor 1 electrically connected to the control module and two fixing seats, the two fixing seats are fixedly mounted at the two end positions of the bottom surface of the second U-shaped frame respectively, a bidirectional screw is rotatably mounted between the two fixing seats, and two sliding rods symmetrically arranged about the bidirectional screw are fixedly connected between the two fixing seats, two sliding seats symmetrically distributed about the middle position of the bidirectional screw are threadedly mounted on the outer periphery of the bidirectional screw, and the sliding seats are slidably connected to the sliding rods;

[0018] The motor 1 is fixedly mounted on the outer side of a fixing seat, and the end of the bidirectional screw rod close to the motor 1 rotates through the fixing seat at the corresponding position and is fixedly connected to the output shaft end of the motor 1;

[0019] A set of side limit assemblies is respectively fixedly connected to the top surfaces of the two slide seats.

[0020] Furthermore, the side limit assembly includes a support plate vertically fixedly mounted on the top surface of the slide, 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;

[0021] A plurality of balls are evenly embedded on the inner side surface of the side limit plate, and a guide assembly is installed at one end of the side limit plate close to the feed end of the conveying mechanism, and the guide assembly is electrically connected to the control module;

[0022] The support plate is in sliding contact with both sides of the movable groove.

[0023] Furthermore, the conveying assembly includes a second motor, a first pulley, and a strip plate. The strip plate is fixedly mounted on the support plate near the top, the strip plate is arranged parallel to the side limit plate, and the inner side surface of the strip plate is rotatably mounted with second pulleys at the middle position and both ends.

[0024] 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.

[0025] The second motor is fixedly mounted on the outer surface 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.

[0026] Furthermore, the guide assembly includes a guide plate 1 obliquely mounted on the end of the side limit plate, and the two guide plates 1 extend outwardly from one end of the side limit plate;

[0027] 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.

[0028] Furthermore, the correction component includes a U-shaped groove formed at the end of the side limit plate, the U-shaped groove is aligned with and penetrates the avoidance groove, and a pin is fixedly installed between the top and bottom surfaces of the U-shaped groove;

[0029] 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;

[0030] One end of the correction plate is rotatably connected to the pin shaft, 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 respectively through the hinge seat 2 and the hinge seat 1;

[0031] 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.

[0032] 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. 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;

[0033] A second guide plate that is tilted upward is fixedly mounted on one end of the upper limit plate close to the guide assembly.

[0034] Furthermore, 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 being electrically connected to the control module, the telescopic end of the electric telescopic rod 1 being fixedly mounted with a mounting plate arranged parallel to the side plate, both ends of the bottom surface of the mounting plate being fixedly mounted with vertically arranged connecting rods, the bottom end of the connecting rod slidingly passing through the top surface of the U-shaped frame 1 to be fixedly mounted with a mounting plate, and cameras 5 and 6 being respectively mounted on opposite sides of the two mounting plates;

[0035] A flattening assembly is installed between the two connecting rods.

[0036] Furthermore, the flattening assembly includes a pressure strip disposed between the two connecting rods, and both ends of the pressure strip are respectively connected to the peripheries of the two connecting rods in a penetrating sliding manner;

[0037] 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 end of the spring is fixedly connected to the inner top surface of the U-shaped frame.

[0038] Beneficial effects of the present invention:

[0039] 1. During the transportation of the packaging box, the packaging box enters between U-shaped frame 1 and 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 under 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 of the packaging box. At the same time, camera 3 detects the top surface of the packaging box, camera 2 detects the bottom surface of the packaging box, and camera 1 and 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, effectively improving the detection efficiency.

[0040] 2. The present invention coordinates the side limit assembly and the top limit assembly so that each side of the packaging box is perpendicular to the detection angle between the cameras at the corresponding positions, thereby improving the accuracy of the detection results.

[0041] 3. In the correction component, the two electric push rods perform synchronous telescopic movement, so that the electric push rods perform periodic rotation movement about the pin shaft. 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.

[0042] 4. The synchronous downward sliding of the two connecting rods drives cameras 5 and 6 to inspect 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. 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, making the top surface of the packaging box in a stable and flat state, thereby improving the detection accuracy of the top surface of the packaging box. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0044] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention;

[0045] Figure 2 yes Figure 1 A three-dimensional diagram from another angle;

[0046] Figure 3 yes Figure 2 Enlarged view of part B;

[0047] Figure 4 yes Figure 1 Enlarged view of part A;

[0048] 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;

[0049] Figure 6 yes Figure 5 Enlarged view of part C;

[0050] 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;

[0051] Figure 8 yes Figure 7 Enlarged view of part D in the middle;

[0052] Figure 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;

[0053] Figure 10 This is a schematic diagram of the structure of the correction component of the present invention before correction of the packaging box;

[0054] Figure 11 This is a schematic diagram of the structure of the packaging box after correction by the correction component of the present invention;

[0055] The reference numerals in the figures are as follows:

[0056] 1- side panel, 2- support leg, 3- conveyor roller, 4- pulley transmission box, 5- U-shaped frame 1, 6- control module, 7- front and rear detection components, 8- camera 1, 9- limit mechanism, 10- camera 3, 11- U-shaped frame 2, 12- fixed seat, 13- motor 1, 14- slide seat, 15- bidirectional screw rod, 16- slide rod, 17- movable groove, 18- support plate, 19- pulley 1, 20- belt, 21- pulley 2, 22- strip plate, 23- side limit plate, 24- ball bearing, 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, 48-pin shaft. DETAILED DESCRIPTION

[0057] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making any creative efforts shall fall within the scope of protection of the present invention.

[0058] Example 1: Please refer to Figures 1 to 11 In an embodiment of the present invention, a printing quality inspection device includes a conveying mechanism, on which a detection mechanism is fixedly mounted. The detection mechanism includes a U-shaped frame 1 5 fixedly mounted in the middle of the top surface of the conveying mechanism and a U-shaped frame 2 11 fixedly mounted in the middle of the bottom surface of the conveying mechanism. The U-shaped frame 2 11 is located directly below the U-shaped frame 1 5.

[0059] A camera 3 10 is mounted 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 mounted in the middle of the two inner side surfaces of the U-shaped frame 1 5, a camera 2 44 is mounted 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 mounted on the top surface of the U-shaped frame 1 5;

[0060] The bottom surface of the U-shaped frame 11 is provided with two movable slots 17 symmetrically distributed about the camera 44 in the longitudinal direction. An adjustment assembly is fixedly mounted 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 respectively pass through the two movable slots 17 and are in transmission connection with the adjustment assembly.

[0061] The limiting mechanism 9 includes 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;

[0062] The top surface of the U-shaped frame 5 is also equipped with a control module 6, 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.

[0063] The transmission mechanism includes two parallel side plates 1, with multiple transmission rollers 3 installed in an array along the length of the two side plates 1 in reverse order. A pulley transmission box 4 is provided on the outer side of one side plate 1 to sequentially transmit the multiple transmission rollers 3. A drive motor is installed at the input end of the pulley transmission box 4 to drive the pulley transmission box 4. The drive motor is electrically connected to the control module 6.

[0064] 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;

[0065] A plurality of supporting legs 2 are mounted on the bottom surface of the side panel 1 in an array along its length.

[0066] Among them, 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 fixedly installed at the two end positions of the bottom surface of the U-shaped frame 2 11, a bidirectional screw 15 is rotatably installed between the two fixed seats 12, and two slide rods 16 symmetrically arranged about the bidirectional screw 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 15 are installed on the outer periphery of the bidirectional screw 15 in a through-threaded manner, and the slide seat 14 and the slide rod 16 are through-slidingly connected;

[0067] The motor 13 is fixedly mounted on the outer side of a fixing seat 12, and the bidirectional screw 15 is rotated at one end close to the motor 13, passes through the fixing seat 12 at the corresponding position, and is fixedly connected to the output shaft end of the motor 13;

[0068] A set of side limit assemblies is fixedly connected to the top surfaces of the two slides 14 respectively.

[0069] By setting the adjustment component, the distance between the two sets of side limit components can be adjusted within a certain range, thereby being adaptable to packaging boxes 42 of different sizes, thereby improving the applicability of the present invention.

[0070] The side limit assembly includes a support plate 18 vertically fixedly mounted on the top surface of the slide 14. The top end 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. 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.

[0071] A plurality of balls 24 are evenly embedded on the inner side of the side limit plate 23. The provision 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 feed end of the conveyor mechanism, and the guide assembly is electrically connected to the control module 6;

[0072] The support plate 18 is in sliding contact with both sides of the movable groove 17 .

[0073] The conveying assembly includes a second motor 37, a first pulley 19, and a strip plate 22. The strip plate 22 is fixedly mounted on the support plate 18 near the top. The strip plate 22 is arranged parallel to the side limit plate 23. The inner side surface of the strip plate 22 is rotatably mounted with second pulleys 21 at the middle position and both ends.

[0074] Pulley 19 is rotatably mounted on the inner side of the support plate 18, and is located directly below the middle pulley 2 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.

[0075] Motor 2 37 is fixedly mounted on the outer surface of the support plate 18. Motor 2 37 is coaxial with pulley 19. The output shaft end of motor 2 37 rotates through the support plate 18 and is fixedly connected to pulley 19. Motor 2 37 is electrically connected to the control module 6.

[0076] The guide assembly includes a guide plate 1 36 obliquely mounted on the end of the side limit plate 23, and the two guide plates 1 36 extend outward from one end of the side limit plate 23;

[0077] 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 .

[0078] The top limit assembly includes an electric telescopic rod 25, and both ends of the top surface of the side limit plate 23 are fixedly installed with a vertical electric telescopic rod 25. An upper limit plate 26 is fixedly installed between the top ends of the two electric telescopic rods 25. The upper limit plate 26 is located directly above the conveying assembly.

[0079] A second guide plate 27 is fixedly mounted on one end of the upper limit plate 26 close to the guide assembly and tilted upward.

[0080] Among them, the front and rear detection components include an electric telescopic rod 38 fixedly installed at the center 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 panel 1. The bottom end of the mounting plate 39 is fixedly installed with a vertical connecting rod 40. The bottom end of the connecting rod 40 slides through the top surface of the U-shaped frame 5 to be fixedly installed with a mounting plate 41. The opposite sides of the two mounting plates 41 are respectively installed with a camera 5 47 and a camera 6 43;

[0081] A flattening assembly is installed between the two connecting rods 40 .

[0082] Existing inspection equipment can cause the sides of boxes to deviate from the conveyor direction during transport. As the boxes pass through the side inspection cameras, the camera is not perpendicular to the box's side, and the image may be distorted due to perspective. This distortion can blur or distort the actual printed content, reducing recognition accuracy. Furthermore, the bottom of the box contacts the conveyor structure, making it difficult to inspect all sides in a single inspection. A second placement inspection is often required, reducing inspection efficiency.

[0083] The printing quality detection device provided by the present invention is used:

[0084] Place the feeding end of the packaging box 42 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;

[0085] Before the inspection, 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 limit component to adapt to the height of the packaging box 42;

[0086] 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 back sides 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 sides of the packaging box 42 can be synchronously detected at the same time, effectively improving the detection efficiency.

[0087] Furthermore, by coordinating the side limiting components and the top limiting components, 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 results.

[0088] In the conveying mechanism, the packaging box 42 is placed on the conveying roller 3, and the rotation of multiple conveying rollers 3 conveys the packaging box 42. When placing it, it should be noted that the joint of the top surface of the packaging box 42 needs to be parallel to the side panel 1, and it needs to 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.

[0089] After the packaging box 42 enters between the two side limit plates 23, the two sides of the packaging box 42 contact the inner side surfaces of the two side limit plates 23, so that the left and right sides of the packaging box 42 can be parallel to the two sides of the U-shaped frame 5. As the packaging box 42 gradually enters the U-shaped frame 5, the bottom surface of the packaging box 42 gradually loses the support provided by the conveyor rollers 3, and is supported by the two sets of conveyor components on both sides of the bottom surface.

[0090] Specifically, in the conveying assembly, the second motor 37 drives the first pulley 19 to rotate, and cooperates with the second pulley 21 to keep 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 directly below the third camera 10.

[0091] The top surface of the packaging box 42 is usually in an unsealed state. Therefore, the two movable panels on the top surface of the packaging box 42 are normally in an inclined state, that is, there is an angle between them and the top surface. At this time, the camera 3 10 cannot detect at the optimal detection angle. The present invention solves the above problem by setting up a top surface limit assembly. Specifically, when the packaging box 42 enters between the two side limit plates 23, the two 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 panels on the top surface of the packaging box 42 are in a flush state, allowing the camera 3 10 to detect the top surface of the packaging box 42 at a vertical angle.

[0092] When the packaging 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 packaging box 42, and at the same time, the electric telescopic rod one 38 is controlled to retract until the camera five 47 and the camera six 43 are respectively located at the front and back sides of the packaging box 42, thereby realizing the simultaneous and vertical detection angle detection of the six sides of the packaging box 42, thereby improving the detection efficiency and the accuracy of the detection results.

[0093] 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.

[0094] The control module 6 may use a PLC (Programmable Logic Controller). The technology of using PLC to control the operation of the motor, electric telescopic rod and electric push rod belongs to the scope of existing technology. This control method has been widely used in the control systems of industrial automation, robots and various mechanical equipment.

[0095] Among them, detecting printing quality by using a camera is also an existing technology. Usually, the camera connects the collected images to a dedicated image processing computer or controller through USB, Ethernet or other interfaces for subsequent data processing, analysis and quality evaluation.

[0096] Example 2: Please refer to Figure 1 、 Figures 4 to 6 、 Figure 10 and Figure 11On the basis of Example 1, the correction component includes a U-shaped groove 29 provided 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 pin 48 is fixedly installed between the top and bottom surfaces of the U-shaped groove 29;

[0097] 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 fixedly mounted on the side of the mounting seat 32 at one end away from the side limit plate 23;

[0098] One end of the correction plate 30 is rotatably connected to the pin 48. A second hinge seat 35 is fixedly mounted on the side of the correction plate 30 near the side plate 1. An electric push rod 33 is mounted between the second hinge seat 35 and the first hinge seat 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 second hinge seat 35 and the first hinge seat 34 respectively.

[0099] 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 .

[0100] 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: Figure 10 In the entry state shown, the packaging box 42 is blocked between the two guide plates 36;

[0101] In this embodiment, the control module 6 controls the two electric push rods 33 to perform synchronous telescopic movements, so that the electric push rods 33 perform periodic rotational 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.

[0102] Example 3: Please refer to Figure 9 On the basis of Example 2, the flattening assembly includes a pressure strip 45 provided between the two connecting rods 40, and both ends of the pressure strip 45 are respectively connected to the periphery of the two connecting rods 40 in a penetrating sliding manner;

[0103] 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, and the top of the spring 46 is fixedly connected to the inner top surface of the U-shaped frame 5.

[0104] 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 in detecting 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 tilted, resulting in the top surface of the packaging box 42 still being uneven after limiting, thereby adversely affecting the detection results.

[0105] In this embodiment, the synchronous downward sliding of the two connecting rods 40 drives camera five 47 and 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.

[0106] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the invention as claimed.

Claims

1. A printing quality inspection device, comprising a conveying mechanism, on which a detection mechanism is fixedly mounted, characterized in that: The detection mechanism includes 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), and the conveying mechanism includes two parallel side plates (1); 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 longitudinal direction. 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 (5). The bottom ends of the two groups of limiting mechanisms (9) respectively pass through the two movable grooves (17) and are connected to the adjustment components in a transmission manner. 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 (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); The top surface limiting assembly includes two electric telescopic rods (25), and the two ends of the top surface of the side limiting assembly are fixedly installed with the two vertically arranged electric telescopic rods (25). 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) is fixedly mounted on one end of the upper limit plate (26) close to the guide assembly and tilted upward; 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), the telescopic end of the electric telescopic rod (38) being fixedly mounted with a mounting plate (39) arranged parallel to the side plate (1), the bottom ends of the mounting plate (39) being fixedly mounted with vertically arranged connecting rods (40), the bottom end of the connecting rod (40) slidingly passing through the top surface of the U-shaped frame (5) being fixedly mounted with a mounting plate (41), and the two opposite sides of the mounting plates (41) being respectively mounted with a camera five (47) and a camera six (43); A flattening assembly is installed between the two connecting rods (40); The flattening assembly comprises a pressure strip (45) disposed between the two connecting rods (40), and both 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 installed at both ends of the top surface of the pressure strip (45), and the springs (46) are sleeved on the periphery of (49) at the corresponding position. The top end of the spring (46) is fixedly connected to the inner top surface of the U-shaped frame (5).

2. A printing quality inspection device according to claim 1, characterized in that: A plurality of conveying rollers (3) are installed in a reverse array along the length of the two side plates (1), and a pulley transmission box (4) for sequentially transmitting and connecting the plurality of conveying rollers (3) is provided 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 U-shaped frame 1 (5) is fixedly installed between the top surfaces of the two side panels (1), and the U-shaped frame 2 (11) is fixedly installed 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; 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.

3. A printing quality inspection device according to claim 2, characterized in that: 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 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), 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) by a through-threaded manner, and the slide seat (14) and the slide rod (16) are through-slidingly connected; The motor 1 (13) is fixedly mounted on the outer side of a fixed seat (12), and the bidirectional screw rod (15) is rotated at one end close to the motor 1 (13) and passes 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 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 includes a support plate (18) vertically fixedly mounted on the top surface of the slide (14), the top end 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), the top end 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 surface of the side limit plate (23), and a guide assembly is installed at one end of the side limit plate (23) close to the feed 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).

5. A printing quality inspection device according to claim 4, characterized in that: The conveying assembly includes 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) near the top, the strip plate (22) is arranged parallel to the side limit plate (23), and the inner side surface of the strip plate (22) is rotatably mounted with a second pulley (21) at the middle position and both ends. The pulley 1 (19) is rotatably mounted on the inner side surface of the support plate (18), and the pulley 1 (19) is located directly below the middle pulley 2 (21). A belt (20) is installed between the pulley 1 (19) and the three pulleys 2 (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 includes a guide plate (36) obliquely mounted on the end of the side limit plate (23), and the ends of the two guide plates (36) away from the side limit plate (23) extend 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 includes a U-shaped groove (29) formed 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 pin shaft (48) 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 pin shaft (48) in a through-type rotational connection. A hinge seat 2 (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 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).

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