Flexible printed matter surface detection device

Abstract

The utility model discloses a flexible printed matter surface detection device, which comprises a following detection assembly, and the following detection assembly comprises a U-shaped conveying seat, a detection cover, a sliding chute, a sliding block, a driving screw rod, a screw hole, a driving motor, a controller and an industrial camera. According to the utility model, the driving motor drives the driving screw rod, so that the industrial camera can synchronously move along with the flexible printed matter, and the camera and the printed matter are ensured to be relatively static during shooting, thereby greatly reducing the problem of image distortion caused by motion blurring, improving the definition of the shot image and improving the quality of the printed matter. Therefore, the industrial camera can accurately capture tiny defects and details on the surface of the printed matter, and a high-quality image basis is provided for accurate detection; through cooperative work of multiple sensors, the moving speed and the shooting time of the industrial camera are accurately controlled, it is ensured that the camera can be accurately aligned with a printed matter all the time for shooting, detection errors caused by speed mismatching or position deviation are avoided, and the detection accuracy and reliability are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to printing detection technical field, concretely to a kind of flexible printing surface detection device. BACKGROUND

[0002] In the process of flexographic printing, due to the influence of printing process, ink characteristics and equipment running state and other factors, the surface of the printed matter may appear defects such as ink dots, scratches, misregistration and so on. These defects not only affect the quality of the printed matter, reduce the market competitiveness of the product, but also may lead to the production of a large number of unqualified products, causing resource waste and increase of production cost.

[0003] The traditional flexographic printing detection method is mostly manual detection, which is low in efficiency and the detection result is easily affected by subjective factors, so it is difficult to ensure the accuracy and consistency of the detection. With the development of industrial automation technology, the method of using industrial cameras for printed matter surface detection has been gradually applied. However, in the existing detection device based on industrial cameras, due to the continuous movement of the printed matter on the conveyor belt during shooting, there is relative motion between the camera and the printed matter, which easily causes the image to be blurred, affecting the accuracy of the detection result. Therefore, a flexographic printing surface detection device is proposed. SUMMARY

[0004] The purpose of the utility model is to provide a kind of flexographic printing surface detection device to solve one of the problems raised in the above background.

[0005] The utility model is implemented by the following technical solutions: a kind of flexographic printing surface detection device, including follow-up detection component, the follow-up detection component includes U-shaped conveying seat, detection cover, sliding slot, sliding block, drive screw, screw hole, drive motor, controller, mounting plate and industrial camera;

[0006] The upper surface of the rear part of the U-shaped conveying seat is fixedly connected with the detection cover on both sides, the upper surface of the detection cover is provided with a sliding slot in the middle, the inner side wall of the sliding slot is slidably connected with a sliding block, a drive screw penetrates through the center of the front surface of the detection cover, a screw hole is formed in the center of the front surface of the sliding block, the outer side wall of the drive screw is threadedly connected to the inner side wall of the screw hole, a drive motor is fixedly connected to the outer side of the center of the front surface of the detection cover, the front surface of the drive screw is fixedly connected to the output end of the drive motor, a controller is fixedly connected to the middle of one side of the upper surface of the detection cover, the input end of the drive motor is electrically connected to the output end of the controller, the bottom of the sliding block is fixedly connected with a mounting plate, an industrial camera is installed at the bottom of the mounting plate, and the industrial camera is electrically connected with the controller.

[0007] As a further preferred of the technical solution: one side of the U-shaped conveying seat front and rear are respectively penetrated with driving shaft and driven shaft, the outer side wall of the driving shaft and driven shaft is fixedly connected with transmission roller, the outer side wall of two transmission rollers is rotatably connected with conveying belt, the inner side wall of the U-shaped conveying seat is installed with a plurality of position sensors near the upper part of the conveying belt on both sides, the output end of the position sensor is electrically connected to the input end of the controller, one side of the U-shaped conveying seat is fixedly connected with conveying motor near the outer side of the driving shaft, one end of the driving shaft is fixedly connected to the output end of the conveying motor, and the input end of the conveying motor is electrically connected to the output end of the controller.

[0008] As a further preferred of the technical solution: the two sides of the detection cover are provided with limiting through grooves, and the inner side walls of the two limiting through grooves on the same side are slidably connected with U-shaped supports, one side of the U-shaped support close to the industrial camera is fixedly connected with a light reflecting cover, the inside of the light reflecting cover is installed with a light emitting lamp strip, and the front and rear of the side of the U-shaped support away from the light reflecting cover are provided with threaded holes.

[0009] As a further preferred of the technical solution: the outer side wall of the driving shaft away from the conveying motor is installed with a rotating speed sensor, and the output end of the rotating speed sensor is electrically connected to the input end of the controller.

[0010] As a further preferred of the technical solution: one side of the U-shaped conveying seat is penetrated with a plurality of supporting shafts, the outer side wall of the supporting shaft is rotatably connected with a supporting roller, and the outer side wall of the supporting roller is rotatably connected to the inner top wall of the conveying belt.

[0011] As a further preferred of the technical solution: the inner side wall of the sliding groove is provided with a limiting groove in the middle of both sides, and the limiting block is fixedly connected to the both sides of the sliding block, and the outer side wall of the limiting block is slidably connected to the inner side wall of the limiting groove.

[0012] As a further preferred of the technical solution: the side of the controller away from the sliding groove is provided with a touch screen.

[0013] As a further preferred of the technical solution: the outer side of the lower surface of the U-shaped conveying seat is fixedly connected with a supporting frame.

[0014] The advantages of the utility model are:

[0015] 1. The utility model discloses a drive motor drives the drive screw, makes industrial camera can follow the soft -cover printing product synchronous movement, guarantees the camera and printing product relative stillness when shooting, this greatly reduces the image distortion problem of the motion blur, improves the definition of the shooting image, thereby makes industrial camera can accurately capture the tiny defect and the details of printing product surface, such as ink point, scratch, overprint inaccuracy etc, provides high -quality image basis for accurate detection,

[0016] 2. The utility model discloses through the cooperation of multiple sensors, the speed sensor on the driving shaft real -time monitoring the speed of the conveyer belt, and the position sensor accurately detects the position of soft -cover printing product, and the data is fed back to the controller, and the controller is accurately controlled according to these information the moving speed and the shooting of industrial camera, ensure that the camera can accurately aim at printing product and shoot all the time, avoid the detection error caused by the speed mismatch or position deviation, improve the accuracy and reliability of detection. ACCURACY

[0017] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, below will to the drawing needed to use in the embodiment or prior art description simple introduction, obviously, the drawing in the following description only some embodiments of the utility model, for those skilled in the art, under the premise of not paying the creative labor, can also obtain other drawings according to these drawings.

[0018] Figure 1 It is a perspective structure schematic drawing of the utility model,

[0019] Figure 2 It is another perspective structure schematic drawing of the utility model,

[0020] Figure 3 It is the detection cover and industrial camera structure schematic drawing of the utility model,

[0021] Figure 4 It is the U-shaped conveying seat and support roller structure schematic drawing of the utility model.

[0022] In the drawing: 1, follow detection assembly;11, U-shaped conveying seat;12, detection cover;13, sliding groove;14, sliding block;15, drive screw;16, screw hole;17, drive motor;18, controller;19, mounting plate;20, industrial camera;21, driving shaft;22, driven shaft;23, transmission roller;24, conveyer belt;25, position sensor;26, conveying motor;27, limit through slot;28, U-shaped support;29, light reflector;30, light emitting lamp strip;31, threaded hole;32, limit knob;33, speed sensor;34, support shaft;35, support roller;36, limit slot;37, limit block;38, touch screen;39, support frame. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0024] Embodiment

[0025] Please refer to Figures 1-4 The present application provides a technical scheme: a kind of soft printing surface detection device, including follow-up detection component 1, the follow-up detection component 1 includes U-shaped conveying seat 11, detection cover 12, chute 13, sliding block 14, drive screw 15, screw hole 16, drive motor 17, controller 18, mounting plate 19 and industrial camera 20;

[0026] The upper surface rear of the U-shaped conveying seat 11 is fixedly connected with detection cover 12 on both sides, the upper surface middle part of the detection cover 12 is provided with chute 13, the inner side wall of the chute 13 is slidably connected with sliding block 14, the front surface upper center of the detection cover 12 is penetrated with drive screw 15, the front surface center of the sliding block 14 is provided with screw hole 16, the outer side wall of the drive screw 15 is threadedly connected to the inner side wall of the screw hole 16, the outer side of the front surface upper center of the detection cover 12 is fixedly connected with drive motor 17, the front surface of the drive screw 15 is fixedly connected to the output end of the drive motor 17, the upper surface side middle part of the detection cover 12 is fixedly connected with controller 18, the input end of the drive motor 17 is electrically connected to the output end of the controller 18, the bottom of the sliding block 14 is fixedly connected with mounting plate 19, the bottom of the mounting plate 19 is installed with industrial camera 20, the industrial camera 20 is electrically connected with controller 18, by sliding block 14 sliding in the inside of chute 13, so as to increase the stability of sliding block 14 sliding, and then increase the stability of industrial camera 20 moving.

[0027] In the embodiment, specifically: the U-shaped conveying seat 11 is penetrated by a driving shaft 21 and a driven shaft 22 at the front and rear sides, respectively, the outer side walls of the driving shaft 21 and the driven shaft 22 are fixedly connected with transmission rollers 23, the outer side walls of the two transmission rollers 23 are rotatably connected with a conveying belt 24, the inner side walls of the U-shaped conveying seat 11 near the upper part of the conveying belt 24 are provided with a plurality of position sensors 25, the output ends of the position sensors 25 are electrically connected to the input ends of the controller 18, one side of the U-shaped conveying seat 11 near the driving shaft 21 is fixedly connected with a conveying motor 26, one end of the driving shaft 21 is fixedly connected to the output end of the conveying motor 26, and the input end of the conveying motor 26 is electrically connected to the output end of the controller 18, so that the position information of the flexographic printed matter on the conveying belt 24 can be monitored in real time through the position sensor 25; when the printed matter moves with the conveying belt 24 and enters the detection range of the position sensor 25, the position sensor 25 will be triggered, and the detected position signal will be transmitted to the controller 18 in the form of an electric signal.

[0028] In the embodiment, specifically: the detection cover 12 is provided with limiting through grooves 27 at the front and rear sides, the inner side walls of the two limiting through grooves 27 on the same side are slidably connected with U-shaped supports 28, one side of the U-shaped support 28 near the industrial camera 20 is fixedly connected with a light reflecting cover 29, the light reflecting cover 29 is internally provided with a light emitting lamp strip 30, the front and rear sides of the side of the U-shaped support 28 away from the light reflecting cover 29 are provided with threaded holes 31, and the inner side walls of the threaded holes 31 are threadedly connected with limiting knobs 32, so that the limiting knobs 32 are tightly abutted against the detection cover 12 by being tightened, so as to limit the U-shaped support 28 and further limit the light reflecting cover 29.

[0029] In the embodiment, specifically: the outer side wall of the driving shaft 21 away from the conveying motor 26 is provided with a rotating speed sensor 33, and the output end of the rotating speed sensor 33 is electrically connected to the input end of the controller 18.

[0030] The rotation speed sensor 33 is responsible for real-time monitoring of the rotation speed of the driving shaft 21, which drives the transmission roller 23 to drive the conveying belt 24 to rotate, and the rotation speed of the driving shaft 21 directly determines the conveying speed of the conveying belt 24, so the rotation speed information of the driving shaft 21 obtained by the rotation speed sensor 33 actually reflects the moving speed of the flexographic printed matter on the conveying belt 24; these rotation speed data are transmitted to the controller 18 in the form of electrical signals, and after the controller 18 receives the signals, a series of key processes will be performed; first, it can accurately calculate the real-time conveying speed of the conveying belt 24 according to the rotation speed signal; then, compare this speed information with the preset ideal speed, and once it is found that the actual speed deviates from the ideal speed, the controller 18 will quickly adjust the output power and rotation speed of the conveying motor 26 to ensure that the conveying belt 24 always runs at a stable and appropriate speed, and ensure the stability of the flexographic printed matter conveying;

[0031] The specific way to calculate the conveying speed of the conveying belt 24 is as follows:

[0032] The rotation speed sensor 33 will measure the rotation speed of the driving shaft 21 in real time, denoted as n (unit: revolutions per minute, r / min); the transmission roller 23 is fixedly installed on the driving shaft 21, and its diameter is denoted as d (unit: meters, m); this parameter can be obtained during equipment design or installation, and is a known fixed value; since the transmission roller 23 is fixedly connected with the driving shaft 21, the rotation speed of the transmission roller 23 and the rotation speed of the driving shaft 21 are the same, both of which are n; and the conveying belt 24 is sleeved on the transmission roller 23, and the transmission roller 23 drives the conveying belt 24 to move when it rotates, and there is no relative sliding between them, which means that the linear speed of the surface of the transmission roller 23 and the conveying speed of the conveying belt 24 are equal;

[0033] The circumference of a circle is calculated by C=πd;

[0034] Wherein, C is the circumference of the circle, π is the circle constant (usually 3.14), and d is the diameter of the circle;

[0035] The transmission roller 23 moves a distance equal to the circumference of the transmission roller 23 every time it rotates one circle;

[0036] The transmission roller 23 rotates n times per minute, so the distance it drives the conveying belt 24 to move in one minute is n circumferences, i.e. n×C=n×πd;

[0037] This distance is also the distance that the conveying belt 24 moves in one minute, i.e. the conveying speed v of the conveying belt 24 (unit: meters per minute, m / min.

[0038] In this embodiment, specifically: the U-shaped conveying seat 11 is provided with a plurality of supporting shafts 34 in the middle of one side, and the outer side wall of each supporting shaft 34 is rotatably connected with a supporting roller 35, and the outer side wall of the supporting roller 35 is rotatably connected with the inner top wall of the conveying belt 24. The supporting roller 35 rotatably connected with the outer side wall of the supporting shaft 34 supports the conveying belt 24, so as to ensure the flatness of the upper surface of the conveying belt 24 and prevent the upper surface of the conveying belt 24 from bending and sagging.

[0039] In this embodiment, specifically: the inner side wall of the chute 13 is provided with a limiting groove 36 in the middle of both sides, and the middle of both sides of the sliding block 14 is fixedly connected with a limiting block 37, and the outer side wall of the limiting block 37 is slidably connected with the inner side wall of the limiting groove 36. The limiting block 37 on the sliding block 14 slides in the limiting groove 36, so as to limit the limiting block 37 and increase the stability of the sliding block 14 in the chute 13.

[0040] In this embodiment, specifically: the side of the controller 18 away from the chute 13 is provided with a touch screen 38. The touch screen 38 is used to intuitively set the shooting parameters of the industrial camera 20, such as adjusting the exposure time, the sensitivity, the shooting frame rate, etc., so that the camera can adapt to the detection needs of different printed matters and obtain high-quality images. At the same time, the running parameters of the conveying motor 26 and the driving motor 17 can be set, such as setting the running speed of the conveying belt 24 and the following speed of the industrial camera 20, so as to ensure that the printed matter and the camera move synchronously and improve the detection accuracy. During the detection process, the touch screen 38 displays the running state of the equipment in real time, such as the rotating speed of the motor and the feedback information of the position sensor 25, so that the operator can master the equipment situation in time. If an abnormality occurs, the operator can adjust the equipment on the touch screen 38 in time. In addition, through the touch screen 38, the operator can view the real-time images shot by the industrial camera 20 and preliminarily observe the surface of the printed matter. Once a problem is found, the operator can intervene in time. Moreover, the touch screen 38 also has a storage and query function, which can save the detection data and historical images, so as to facilitate the subsequent tracing and analysis of the quality of the printed matter and provide data support for optimizing the printing process.

[0041] In this embodiment, specifically: the U-shaped conveying seat 11 is provided with a plurality of supporting shafts 34 in the middle of one side, and the outer side wall of each supporting shaft 34 is rotatably connected with a supporting roller 35, and the outer side wall of the supporting roller 35 is rotatably connected with the inner top wall of the conveying belt 24. The supporting roller 35 rotatably connected with the outer side wall of the supporting shaft 34 supports the conveying belt 24, so as to ensure the flatness of the upper surface of the conveying belt 24 and prevent the upper surface of the conveying belt 24 from bending and sagging.

[0042] The working principle or structural principle is as follows: first, the operator sets parameters of the detection device through the touch screen 38 on one side of the controller 18, such as setting shooting parameters of the industrial camera 20, initial running parameters of the conveying motor 26 and the driving motor 17, and the like; then, the position of the U-shaped support 28 in the limiting through slot 27 is adjusted to adjust the height of the light reflector 29 and the light bar 30, so as to meet different lighting requirements, and after the adjustment, the limiting screw knob 32 is tightened to fix the U-shaped support 28 and the light reflector 29; the controller 18 sends a starting signal to the conveying motor 26, the conveying motor 26 starts to run, drives the driving shaft 21 to rotate, the transmission roller 23 on the driving shaft 21 rotates synchronously, the transmission roller 23 on the driven shaft 22 is driven by the conveying belt 24 to rotate synchronously, so that the conveying belt 24 rotates circularly to convey the flexographic printed matter; at the same time, the rotation speed sensor 33 on the outer side wall of the driving shaft 21 monitors the rotation speed of the driving shaft 21 in real time, and feeds back the rotation speed signal to the controller 18, and the controller 18 calculates the conveying speed of the conveying belt 24 according to the rotation speed signal; when the flexographic printed matter moves to the position sensor 25 detection range on the inner side wall of the U-shaped conveying seat 11, the position sensor 25 sends the detected position signal to the controller 18; after receiving the position signal, the controller 18 confirms that the flexographic printed matter has reached the detection area, and combines the conveying speed of the conveying belt 24 calculated before to prepare to control the industrial camera 20 to start following detection; the controller 18 sends a control signal to the driving motor 17 according to the conveying speed of the conveying belt 24, the driving motor 17 starts to run, drives the driving screw 15 to rotate, since the driving screw 15 is threadedly connected with the screw hole 16 on the sliding block 14, the rotation of the driving screw 15 drives the sliding block 14 to slide in the sliding groove 13 along the conveying direction of the conveying belt 24; the mounting plate 19 at the bottom of the sliding block 14 and the industrial camera 20 mounted on the bottom of the mounting plate 19 move synchronously, so that the industrial camera 20 and the flexographic printed matter are in a relatively static state when shooting, and the relative static shooting can ensure that the industrial camera 20 clearly captures the dot image on the printed matter, and lays a foundation for subsequent accurate analysis of the shape, size and position of the dot and the like; the industrial camera 20 shoots the surface of the flexographic printed matter during the movement, and transmits the shot image data to the controller 18 for analysis and processing, so as to detect whether there is a defect on the surface of the printed matter; after the industrial camera 20 completes the shooting detection of the current flexographic printed matter, the controller 18 controls the driving motor 17 to reverse, drives the driving screw 15 to rotate reversely, so that the sliding block 14 and the industrial camera 20 are reset to the initial position along the sliding groove 13, and wait for detection of the next flexographic printed matter; the whole working process is circularly performed to realize continuous surface detection of the flexographic printed matter, and in the detection process, the operator can view the detection data and the equipment running state in real time through the touch screen 38, and adjust the equipment parameters if necessary.

[0043] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A device for detecting a surface of a flexographic printing form, characterized in that Including follow detection assembly (1), the follow detection assembly (1) includes U-shaped conveying seat (11), detection cover (12), sliding slot (13), sliding block (14), drive screw (15), screw hole (16), drive motor (17), controller (18), mounting plate (19) and industrial camera (20); The upper surface of the U-shaped conveying seat (11) is fixedly connected with detection covers (12) on both sides of the rear part, sliding slots (13) are formed in the upper surface of the detection cover (12), sliding blocks (14) are slidably connected to the inner side wall of the sliding slot (13), a drive screw (15) penetrates through the center of the front upper surface of the detection cover (12), a screw hole (16) is formed in the center of the front surface of the sliding block (14), the outer side wall of the drive screw (15) is threadedly connected to the inner side wall of the screw hole (16), a drive motor (17) is fixedly connected to the outer side of the center of the front upper surface of the detection cover (12), the front surface of the drive screw (15) is fixedly connected to the output end of the drive motor (17), a controller (18) is fixedly connected to the upper surface of the detection cover (12) on one side of the middle part, the input end of the drive motor (17) is electrically connected to the output end of the controller (18), the bottom of the sliding block (14) is fixedly connected with a mounting plate (19), and an industrial camera (20) is installed on the bottom of the mounting plate (19), and the industrial camera (20) is electrically connected with the controller (18).

2. A device for detecting a surface of a flexographic printing product according to claim 1, characterized in that The front part and the rear part of one side of the U-shaped conveying seat (11) are penetrated by a driving shaft (21) and a driven shaft (22), respectively, the outer side walls of the driving shaft (21) and the driven shaft (22) are fixedly connected with transmission rollers (23), the outer side walls of the two transmission rollers (23) are rotatably connected with a conveying belt (24), the inner side walls of the U-shaped conveying seat (11) are installed with a plurality of position sensors (25) near the upper part of the conveying belt (24) on both sides, the output end of the position sensor (25) is electrically connected to the input end of the controller (18), the outer side of one side of the U-shaped conveying seat (11) is fixedly connected with a conveying motor (26) near the driving shaft (21), one end of the driving shaft (21) is fixedly connected to the output end of the conveying motor (26), and the input end of the conveying motor (26) is electrically connected to the output end of the controller (18).

3. A device for detecting a surface of a flexographic printing product according to claim 1, characterized in that Limiting grooves (27) are formed in the front part and the rear part of both sides of the detection cover (12), U-shaped supports (28) are slidably connected to the inner side walls of the limiting grooves (27) on the same side, a light reflecting cover (29) is fixedly connected to one side of the U-shaped support (28) near the industrial camera (20), a light emitting lamp strip (30) is installed in the light reflecting cover (29), screw holes (31) are formed in the front part and the rear part of one side of the U-shaped support (28) away from the light reflecting cover (29), and limiting knobs (32) are threadedly connected to the inner side walls of the screw holes (31).

4. A device for detecting a surface of a flexographic printing product according to claim 2, wherein The outer side wall of the main shaft (21) is provided with a rotating speed sensor (33) away from one side of the conveying motor (26), and the output end of the rotating speed sensor (33) is electrically connected to the input end of the controller (18).

5. A device for detecting a surface of a flexographic printing product according to claim 2, characterized in that A plurality of supporting shafts (34) are penetrated through the middle part of one side of the U-shaped conveying seat (11), and the outer side wall of each of the plurality of supporting shafts (34) is rotatably connected with a supporting roller (35), and the outer side wall of the supporting roller (35) is rotatably connected to the inner top wall of the conveying belt (24).

6. A device for detecting a surface of a flexographic printing product according to claim 1, wherein The inner side wall of the chute (13) is provided with a limiting groove (36) at the middle part of both sides, and the middle part of both sides of the sliding block (14) is fixedly connected with a limiting block (37), and the outer side wall of the limiting block (37) is slidably connected to the inner side wall of the limiting groove (36).

7. A device for detecting a surface of a flexographic printing product according to claim 1, wherein The controller (18) is provided with a touch screen (38) away from the chute (13).

8. A device for detecting a surface of a flexographic printing product according to claim 1, wherein The outer side of the lower surface of the U-shaped conveying seat (11) is fixedly connected with a supporting frame (39).

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