Visual inspection device for printed matters

Abstract

The invention relates to the technical field of visual inspection, and discloses a printed matter visual inspection device which comprises a rack, a conveying belt arranged on the rack, a carrying plate which is conveyed by the conveying belt and used for placing printed matters, and a camera which is arranged on the rack and has a monitoring end facing the conveying belt, the irradiation mechanism is provided with an annular lighting state and a strip-shaped lighting state, and the traction mechanism is used for synchronizing the motion state of the carrying plate along the conveying belt and controlling the irradiation mechanism to be switched between the annular lighting state and the strip-shaped lighting state. The irradiation mechanism can be switched back and forth between an annular lighting state and a strip-shaped lighting state, different light sources do not need to be switched on and off frequently, the problems that the service life of the light sources is shortened, the circuit stability is reduced, and the heat management pressure is increased due to frequent switching on and off are effectively solved, and the problem that interference is generated due to simultaneous irradiation of different light sources is also solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of visual detection, more particularly to a printed matter visual detection device. BACKGROUND

[0002] When the printed matter is visually detected, the annular light source can uniformly light the printed matter, and then the visual camera can detect the problems such as printing color difference, dirt and overprint deviation. The strip light source can obliquely irradiate the printed matter for lighting, and then the visual camera can detect the problems such as scratch, indentation and texture defect on the printed matter.

[0003] At present, in the printed matter production line, the annular light source and the strip light source are arranged around the visual camera. When the annular light source and the strip light source are turned on at the same time, they will interfere with each other and affect the normal detection. Therefore, only one light source can be used at the same time. When the printed matter passes through the visual camera, the annular light source is generally turned on first, and then the strip light source is turned off. Then the annular light source is turned off, and the strip light source is turned on. A large number of printed matters pass through the production line every day. After frequent on-off, the LED element will be accelerated aging due to repeated current impact, and the light decay will be accelerated. In addition, the voltage transient may cause the capacitor resistance overload and trigger the error. In addition, the frequent on-off also causes local temperature rise, and poor heat dissipation may also cause light efficiency decay. SUMMARY

[0004] In order to overcome the above-mentioned defects of the prior art, the present application provides a printed matter visual detection device to solve the problems in the above background.

[0005] The present application provides the following technical scheme: a printed matter visual detection device, comprising a rack, a conveying belt arranged on the rack, a carrier plate transported by the conveying belt and used for placing printed matter, and a camera arranged on the rack and having a monitoring end facing the conveying belt. A traction mechanism and an irradiation mechanism are installed on the rack. The irradiation mechanism is provided with an annular lighting state and a strip lighting state. The traction mechanism is used to synchronize the movement state of the carrier plate along the conveying belt and control the irradiation mechanism to switch between the annular lighting state and the strip lighting state.

[0006] The irradiation mechanism comprises a device shell, a transmission assembly, a lamp shell one and a lamp shell two. The annular light source and the cover plate one are arranged on the lamp shell one. The strip light source and the cover plate two are arranged on the lamp shell two. In the annular lighting state, the cover plate one does not shield the annular light source, and the cover plate two shields the strip light source. In the strip lighting state, the cover plate one shields the annular light source, and the cover plate two does not shield the strip light source.

[0007] Preferably, the carrier plate is fixedly connected with a sliding block, and the sliding block is provided with two groups. One group of the sliding blocks is fixedly connected with a spherical block. A sliding rail is arranged on the rack. The sliding block and the sliding rail form a sliding guide cooperation.

[0008] Preferably, the traction mechanism comprises a support frame, a fixed frame, a moving assembly, a receiving frame and a connecting rod, the support frame and the fixed frame are fixedly installed on the rack, the support frame is fixedly connected with a guide rod and a mounting rod, one end of the guide rod is fixedly connected with a limiting block.

[0009] Preferably, the moving assembly comprises a trigger block, a guide block and a counterweight block, one side of the trigger block is provided with a trigger inclined surface and an unlocking plane, the other side of the trigger block is fixedly connected with an L-shaped plate, the guide block is fixedly connected with a sliding column on one side facing the trigger block, the L-shaped plate is sleeved on the surface of the sliding column, a return spring is sleeved on the surface of the sliding column, and the elastic force of the return spring drives the L-shaped plate to move away from the guide block.

[0010] Preferably, the guide rod is horizontally arranged, the mounting rod is obliquely arranged, the distance between the mounting rod and the ground increases along the movement direction of the object plate, the guide block is sleeved on the surface of the guide rod, the counterweight block is sleeved on the surface of the mounting rod, and the top of the guide block is rotatably installed with a roller.

[0011] Preferably, a connecting rod one and a connecting rod two are arranged between the guide block and the counterweight block, one end of the connecting rod one is hinged to the counterweight block, the other end of the connecting rod one is hinged to one end of the connecting rod two, and the other end of the connecting rod two is hinged to the guide block.

[0012] Preferably, the top of the fixed frame is fixedly connected with a guide rod, the guide rod is vertically arranged, the receiving frame is fixedly connected with a guide block, the guide block is sleeved on the surface of the guide rod, a compression spring is sleeved on the surface of the guide rod, the elastic force of the compression spring drives the guide block to move downward along the guide rod, and the bottom of the receiving frame is provided with an inclined groove, the distance between the inclined groove and the ground increases along the movement direction of the object plate.

[0013] Preferably, the equipment shell is fixedly installed on the rack, the lamp shell one and the lamp shell two are fixedly installed outside the equipment shell, the transmission rod is rotatably installed on the lamp shell one, the cover plate one is fixedly installed on the surface of the transmission rod, the moving rod is rotatably installed on the lamp shell two, and the cover plate two is fixedly installed on the surface of the moving rod.

[0014] Preferably, the transmission assembly comprises a rotating rod, a rotating rod and a connecting frame, the rotating rod and the rotating rod are rotatably installed inside the equipment shell, one end of the rotating rod is fixedly connected with a worm one, one end of the transmission rod extends into the equipment shell, one end of the transmission rod is fixedly connected with a worm wheel one, the worm one is meshingly connected with the worm wheel one, one end of the rotating rod is fixedly connected with a worm two, one end of the moving rod extends into the equipment shell, one end of the moving rod is fixedly connected with a worm wheel two, the worm two is meshingly connected with the worm wheel two, and a belt transmission member is arranged between the rotating rod and the rotating rod.

[0015] Preferably, a stabilizing rod is fixedly connected inside the equipment casing. The stabilizing rod is arranged horizontally. A connecting frame is sleeved on the surface of the stabilizing rod. A gear is fixedly connected to the surface of the rotating rod. A rack is fixedly connected to one side of the connecting frame. The rack and the gear mesh with each other. One end of the connecting rod is hinged to the receiving frame, and the other end of the connecting rod is hinged to the connecting frame.

[0016] The beneficial effects of this invention are: The irradiation mechanism of this invention can switch back and forth between ring lighting and strip lighting. When capturing global defects such as color differences and dirt on printed materials, a ring light source can be used, and a second cover plate can be controlled to block the strip light source. Conversely, when identifying local defects such as scratches and indentations, a strip light source can be used, and a first cover plate can be controlled to block the ring light source. This eliminates the need for frequent switching of different light sources, effectively avoiding problems such as shortened light source lifespan, decreased circuit stability, and increased thermal management pressure caused by frequent switching. It also avoids interference caused by simultaneous irradiation from different light sources. Furthermore, this invention avoids the use of additional electrical control and power devices when controlling the switching of the irradiation mechanism. By setting up a traction mechanism, the conveyor belt transport of printed materials and the switching of light sources are synchronized, improving the overall integrated detection effect of the testing equipment. This strengthens the coordination between the testing equipment and the material transport line, completing comprehensive product testing and avoiding problems such as signal processing delays and reduced reliability that may occur with complex electrical control systems. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure in the initial position of the present invention.

[0019] Figure 2 This is a schematic diagram of the structure of the present invention under ring lighting conditions.

[0020] Figure 3 This is a schematic diagram of the structure of the present invention under strip lighting conditions.

[0021] Figure 4 This is a schematic diagram of the traction mechanism and irradiation mechanism of the present invention.

[0022] Figure 5 This is a schematic diagram of the traction mechanism structure of the present invention.

[0023] Figure 6 This is a schematic diagram of the support frame structure of the present invention.

[0024] Figure 7 Structure diagram of the motion assembly of the application.

[0025] Figure 8 Structure diagram of the receiving frame of the application.

[0026] Figure 9 Structure diagram of the irradiation mechanism of the application.

[0027] Figure 10 Structure diagram of the receiving frame of the application.

[0028] Figure 11 Structure diagram of the ring-shaped light source of the application.

[0029] Figure 12 Structure diagram of the strip-shaped light source of the application.

[0030] The reference signs are as follows: 1, frame; 11, slide rail; 2, conveying belt; 3, object plate; 31, sliding block; 32, spherical block; 4, camera; 5, traction mechanism; 51, support frame; 52, fixed frame; 521, guide rod; 522, compression spring; 53, guide rod; 531, limiting block; 54, mounting rod; 55, motion assembly; 551, trigger block; 5511, trigger inclined surface; 5512, unlocking plane; 552, L-shaped plate; 553, guide block; 554, roller; 555, sliding column; 556, return spring; 557, counterweight block; 558, connecting rod one; 559, connecting rod two; 56, receiving frame; 561, inclined groove; 562, guide block; 57, receiving rod; 6, irradiation mechanism; 61, equipment shell; 62, transmission assembly; 621, rotating rod; 622, rotating rod; 6221, gear; 623, worm gear one; 624, worm one; 625, worm gear two; 626, worm two; 627, belt transmission member; 628, receiving frame; 6281, rack; 629, stabilizing rod; 63, lamp shell one; 631, ring-shaped light source; 64, lamp shell two; 641, strip-shaped light source; 65, transmission rod; 66, motion rod; 67, cover plate one; 68, cover plate two. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the application more obvious and easy to understand, the specific embodiments of the application are described in detail below with reference to the accompanying drawings.

[0032] REFERENCE Figures 1-4The application provides a printed matter visual detection device, which comprises a rack 1, a conveying belt 2 arranged on the rack 1, a carrier plate 3 transported by the conveying belt 2 and used for placing printed matters, and a camera 4 arranged on the rack 1 and monitoring the conveying belt 2, wherein a traction mechanism 5 and an irradiation mechanism 6 are arranged on the rack 1, the irradiation mechanism 6 is provided with a ring-shaped light state and a strip-shaped light state, the traction mechanism 5 is used for synchronizing the movement state of the carrier plate 3 along the conveying belt 2, and the irradiation mechanism 6 is controlled to switch between the ring-shaped light state and the strip-shaped light state.

[0033] The irradiation mechanism 6 comprises a device shell 61, a transmission assembly 62, a lamp shell one 63 and a lamp shell two 64, the lamp shell one 63 is provided with a ring-shaped light source 631 and a cover plate one 67, the lamp shell two 64 is provided with a strip-shaped light source 641 and a cover plate two 68, in the ring-shaped light state, the cover plate one 67 does not shield the ring-shaped light source 631, and the cover plate two 68 shields the strip-shaped light source 641, in the strip-shaped light state, the cover plate one 67 shields the ring-shaped light source 631, and the cover plate two 68 does not shield the strip-shaped light source 641.

[0034] With reference to Figures 1-8 The traction mechanism 5 comprises a support frame 51, a fixing frame 52, a movement assembly 55, a bearing frame 56 and a connecting rod 57, the support frame 51 and the fixing frame 52 are fixedly arranged on the rack 1, the support frame 51 is fixedly connected with a guide rod 53 and a mounting rod 54, and one end of the guide rod 53 is fixedly connected with a limiting block 531.

[0035] The carrier plate 3 is fixedly connected with a sliding block 31, the sliding block 31 is provided with two groups, one group of the sliding blocks 31 is fixedly connected with a spherical block 32, the rack 1 is provided with a sliding rail 11, and the sliding block 31 and the sliding rail 11 form a sliding guide cooperation.

[0036] The movement assembly 55 comprises a trigger block 551, a guide block 553 and a counterweight block 557, one side of the trigger block 551 is provided with a trigger inclined surface 5511 and an unlocking plane 5512, the other side of the trigger block 551 is fixedly connected with an L-shaped plate 552, the guide block 553 is fixedly connected with a sliding column 555 on the side facing the trigger block 551, the L-shaped plate 552 is sleeved on the surface of the sliding column 555, the surface of the sliding column 555 is sleeved with a reset spring 556, and the elastic force of the reset spring 556 drives the L-shaped plate 552 to move in the direction away from the guide block 553.

[0037] The guide rod 53 is horizontally arranged, the mounting rod 54 is obliquely arranged, the spacing between the mounting rod 54 and the ground increases along the movement direction of the carrier plate 3, the guide block 553 is sleeved on the surface of the guide rod 53, the counterweight block 557 is sleeved on the surface of the mounting rod 54, and the top of the guide block 553 is rotatably provided with a roller 554.

[0038] A connecting rod one 558 is hingedly connected at one end to the weight block 557 and at the other end to one end of a connecting rod two 559, and the other end of the connecting rod two 559 is hingedly connected to the guide block 553.

[0039] The fixed frame 52 is fixedly connected at the top with a guide rod 521 arranged vertically, the bearing frame 56 is fixedly connected with a guide block 562, the guide block 562 is sleeved on the surface of the guide rod 521, the surface of the guide rod 521 is sleeved with a compression spring 522, the elastic force of the compression spring 522 drives the guide block 562 to move downward along the guide rod 521, and the bearing frame 56 is provided at the bottom with an inclined groove 561, and the distance between the inclined groove 561 and the ground increases along the movement direction of the object plate 3.

[0040] In use, in the initial position, the irradiation mechanism 6 is in a strip light state, the guide block 553 abuts against the limiting block 531, and the roller 554 is located in the inclined groove 561. The conveying belt 2 conveys the object plate 3 on which the printed matter is placed, the sliding block 31 on the object plate 3 synchronously slides along the slide rail 11, in the sliding process of the sliding block 31, the spherical block 32 contacts the trigger inclined surface 5511, and under the pushing of the spherical block 32, the movement assembly 55 synchronously moves as a whole, the roller 554 rolls along the inclined groove 561, the guide block 553 slides along the guide rod 53, and the weight block 557 slides along the mounting rod 54, in the rolling process of the roller 554 along the inclined groove 561, the roller 554 gradually releases the extrusion on the bearing frame 56, the elastic force of the compression spring 522 is gradually released, the elastic force of the compression spring 522 drives the bearing frame 56 and the guide block 562 to move downward along the guide rod 521 as a whole, the bearing frame 56 moves and drives the irradiation mechanism 6 to switch states through the connecting rod 57, after the roller 554 is separated from the inclined groove 561, the bottom of the guide block 562 abuts against the top of the fixed frame 52, and the position of the bearing frame 56 remains fixed, at this time, the irradiation mechanism 6 switches to a ring light state. Under the push of the spherical block 32, the guide block 553 continues to slide along the guide rod 53, and the counterweight block 557 continues to slide along the mounting rod 54. When the guide block 553 and the support frame 51 come into contact with each other, the spherical block 32 can no longer push the guide block 553 to move. At this time, the spherical block 32 slides along the triggering inclined surface 5511, and under the compression of the spherical block 32, the L-shaped plate 552 moves along the sliding column 555 towards the guide block 553. The return spring 556 retracts under the compression of the L-shaped plate 552. As the elasticity increases, when the spherical block 32 leaves the triggering inclined surface 5511 and arrives at the unlocking plane 5512, the printed matter on the carrier plate 3 arrives at the bottom of the camera 4, the conveyor belt 2 stops moving, and the carrier plate 3 remains stationary. At this time, the counterweight block 557 slides in the opposite direction along the mounting rod 54 under its own weight, and the guide block 553 also slides in the opposite direction along the guide rod 53. In the time before the roller 554 contacts the inclined groove 561, the irradiation mechanism 6, which is in the ring-shaped irradiation state, evenly irradiates the printed matter. When the roller 554 comes into contact with the inclined groove 561, as the roller 554 rolls along the inclined groove 561, the roller 554 gradually squeezes the receiving frame 56. The receiving frame 56 and the guide block 562 move upward along the guide rod 521 as a whole. When the guide block 553 and the limiting block 531 come into contact with each other and return to the initial position, the positions of the roller 554 and the receiving frame 56 remain fixed. At this time, the irradiation mechanism 6 switches to the strip lighting state.

[0041] In summary, the traction mechanism 5 cleverly converts the kinetic energy of the conveyor belt 2 conveying the carrying plate 3 into the power to drive the state switching of the irradiation mechanism 6 through a mechanical linkage design. When the carrying plate 3 moves, the spherical block 32 is linked with the contact trigger motion component 55 of the triggering inclined surface 5511. The counterweight 557 cooperates with the sliding linkage 1 558 and linkage 2 559 along the inclined mounting rod 54 to ensure the smoothness and timing of the action. The whole process does not rely on external power or complex electronic control system. The precise switching of the state of the irradiation mechanism 6 can be completed through mechanical structure alone, which significantly reduces equipment cost and maintenance difficulty, while avoiding problems such as delay or false triggering of electronic control signals.

[0042] Reference Figures 1-12 The equipment housing 61 is fixedly installed on the frame 1. Lamp housing 1 63 and lamp housing 2 64 are both fixedly installed on the outside of the equipment housing 61. A transmission rod 65 is rotatably installed on lamp housing 1 63. Cover plate 1 67 is fixedly installed on the surface of transmission rod 65. A moving rod 66 is rotatably installed on lamp housing 2 64. Cover plate 2 68 is fixedly installed on the surface of moving rod 66.

[0043] The transmission assembly 62 comprises a rotating rod 621, a rotating rod 622 and a connecting frame 628, the rotating rod 621 and the rotating rod 622 are both rotationally installed in the equipment shell 61, one end of the rotating rod 621 is fixedly connected with a worm one 624, one end of the transmission rod 65 extends into the equipment shell 61, one end of the transmission rod 65 is fixedly connected with a worm wheel one 623, the worm one 624 is in meshing connection with the worm wheel one 623, one end of the rotating rod 622 is fixedly connected with a worm two 626, one end of the movement rod 66 extends into the equipment shell 61, one end of the movement rod 66 is fixedly connected with a worm wheel two 625, the worm two 626 is in meshing connection with the worm wheel two 625, and the rotating rod 621 and the rotating rod 622 are provided with a belt transmission part 627 therebetween.

[0044] The equipment shell 61 is fixedly connected with a stable rod 629 inside, the stable rod 629 is horizontally arranged, the connecting frame 628 is sleeved on the surface of the stable rod 629, the surface of the rotating rod 622 is fixedly connected with a gear 6221, one side of the connecting frame 628 is fixedly connected with a rack 6281, the rack 6281 is in meshing connection with the gear 6221, one end of the connecting rod 57 is hingedly connected with the supporting frame 56, and the other end of the connecting rod 57 is hingedly connected with the connecting frame 628.

[0045] In use, in the initial position, the irradiation mechanism 6 is in a strip-shaped lighting state, the cover plate one 67 shields the annular light source 631, and the cover plate two 68 does not shield the strip-shaped light source 641. The conveying belt 2 conveys the object plate 3 on which the printed matter is placed, in the process that the roller 554 rolls along the chute 561, the supporting frame 56 and the guide block 562 move downward as a whole along the guide rod 521, the supporting frame 56 moves and drives the connecting frame 628 to slide synchronously along the stable rod 629 through the connecting rod 57, the connecting frame 628 moves and drives the rotating rod 622 to rotate synchronously around its own axis through the rack 6281 and the gear 6221, the rotating rod 622 rotates and drives the rotating rod 621 to rotate synchronously around its own axis through the belt transmission part 627, the rotating rod 621 rotates and drives the transmission rod 65 to rotate synchronously around its own axis through the worm one 624 and the worm wheel one 623, the rotating rod 622 rotates and drives the movement rod 66 to rotate synchronously around its own axis through the worm two 626 and the worm wheel two 625, the transmission rod 65 rotates and drives the cover plate one 67 to rotate synchronously around the axis of the transmission rod 65, and the movement rod 66 rotates and drives the cover plate two 68 to rotate synchronously around the axis of the movement rod 66, after the roller 554 is separated from the chute 561, the bottom of the guide block 562 abuts against the top of the fixed frame 52, and the position of the supporting frame 56 remains fixed, at this time, the cover plate one 67 does not shield the annular light source 631, the cover plate two 68 shields the strip-shaped light source 641, and the irradiation mechanism 6 is switched to an annular lighting state. When the spherical block 32 leaves the trigger slope 5511 and reaches the unlocking plane 5512, the conveying belt 2 stops moving, the carrier plate 3 remains stationary, and the annular light source 631 illuminates the printed matter before the roller 554 contacts the chute 561, the annular light source 631 surrounds the lens, providing light from multiple directions to the surface of the measured object, which can produce a very uniform overall lighting effect, especially suitable for flat or slightly curved surfaces of printed matter (such as paper, labels and packaging box flat parts), multi-directional lighting also effectively fills the shadows that may be caused by the slight undulations of the surface or the detection angle, ensuring consistent brightness throughout the detected area, avoiding misjudgment, and cooperating with the camera 4 to detect printing color difference, dirt and overprint deviation; When the roller 554 contacts the chute 561, the roller 554 gradually presses the supporting frame 56 to move upward, and similarly, the cover plate one 67 rotates in the opposite direction around the axis of the transmission rod 65, and the cover plate two 68 rotates in the opposite direction around the axis of the movement rod 66, when the guide block 553 and the limiting block 531 are in contact and return to the initial position, the positions of the roller 554 and the supporting frame 56 remain fixed, at this time, the cover plate one 67 blocks the annular light source 631, and the cover plate two 68 does not block the strip-shaped light source 641, the illumination mechanism 6 switches to the strip-shaped lighting state, and the strip-shaped light source 641 obliquely illuminates the printed matter. The strip-shaped light source 641 is essentially linear, and the light mainly spreads along its length direction, with clear directionality in the width direction, which enables it to provide highly directional lighting. When the strip-shaped light source 641 illuminates the surface of the object, any edge perpendicular to the direction of the light (such as the edge of a printed character, a scratch, a burr, or the edge of a concave-convex structure) will produce a clear shadow on the other side, which greatly enhances the contrast of the edge features, making them very prominent in the image. Cooperating with the camera 4, scratches, indentations and texture defects on paper and labels can be detected.

[0046] In summary, through the alternating blocking mechanism of the annular light source 631 and the strip-shaped light source 641, efficient detection of different types of printing defects is achieved. In the annular lighting state, the cover plate two 68 blocks the strip-shaped light source 641, and the annular light source 631 uniformly illuminates the printed matter, which is convenient for the camera 4 to capture global defects such as color difference and dirt. In the strip-shaped lighting state, the cover plate one 67 blocks the annular light source 631, and the strip-shaped light source 641 illuminates at an oblique angle, enhancing the contrast of surface texture and facilitating the identification of local defects such as scratches and indentations. The switching between the two states is triggered by the movement of the carrier plate 3 and is synchronized with the start and stop of the conveying belt 2, ensuring seamless connection during the detection process. In addition, since different light sources do not need to be frequently turned on and off, problems such as shortened light source life, decreased circuit stability and increased heat management pressure caused by frequent switching are effectively avoided.

[0047] The working principle of the present application: in the initial position, the illumination mechanism 6 is in the strip light state, the cover plate one 67 blocks the annular light source 631, the cover plate two 68 does not block the strip light source 641, the guide block 553 is in mutual resistance with the limiting block 531, and the roller 554 is located in the inclined groove 561.

[0048] The conveying belt 2 conveys the object plate 3 on which the printed matter is placed, the sliding block 31 on the object plate 3 slides synchronously along the slide rail 11, in the sliding process of the sliding block 31, the spherical block 32 is in contact with the trigger inclined surface 5511, and under the pushing of the spherical block 32, the movement assembly 55 moves synchronously as a whole, the roller 554 rolls along the inclined groove 561, the guide block 553 slides along the guide rod 53, the counterweight block 557 slides along the mounting rod 54, in the rolling process of the roller 554 along the inclined groove 561, the roller 554 gradually loosens the extrusion on the supporting frame 56, the elastic force of the compression spring 522 is gradually released, the elastic force of the compression spring 522 drives the supporting frame 56 and the guide block 562 to move downward along the guide rod 521 as a whole, the supporting frame 56 moves and drives the adapter frame 628 to slide synchronously along the stable rod 629 through the adapter rod 57, the adapter frame 628 moves and drives the rotating rod 622 to rotate synchronously around its own axis through the rack 6281 and the gear 6221, the rotating rod 622 rotates and drives the rotating rod 621 to rotate synchronously around its own axis through the belt transmission 627, the rotating rod 621 rotates and drives the transmission rod 65 to rotate synchronously around its own axis through the worm one 624 and the worm gear one 623, the rotating rod 622 rotates and drives the movement rod 66 to rotate synchronously around its own axis through the worm two 626 and the worm gear two 625, the transmission rod 65 rotates and drives the cover plate one 67 to rotate synchronously around the transmission rod 65 axis, the movement rod 66 rotates and drives the cover plate two 68 to rotate synchronously around the movement rod 66 axis, after the roller 554 is separated from the inclined groove 561, the bottom of the guide block 562 is in mutual resistance with the top of the fixed frame 52, the position of the supporting frame 56 remains fixed, at this time, the cover plate one 67 does not block the annular light source 631, the cover plate two 68 blocks the strip light source 641, and the illumination mechanism 6 switches to the annular light state.

[0049] When the guide block 553 and the support frame 51 are in mutual resistance, the spherical block 32 can no longer push the guide block 553 to move, at this time, the spherical block 32 slides along the trigger slope 5511, and under the extrusion of the spherical block 32, the L-shaped plate 552 moves along the sliding column 555 towards the direction close to the guide block 553, and the reset spring 556 shrinks under the extrusion of the L-shaped plate 552 and the elastic force increases, when the spherical block 32 leaves the trigger slope 5511 and comes to the unlocking plane 5512, the printed matter on the object plate 3 comes to the bottom of the camera 4, the conveying belt 2 stops moving, and the object plate 3 remains stationary, at this time, the counterweight block 557 reverses along the mounting rod 54 under the action of its own gravity, and the guide block 553 also reverses along the guide rod 53, before the roller 554 contacts the chute 561, the annular light source 631 irradiates the printed matter, the annular light source 631 surrounds the lens, providing light rays irradiating to the surface of the measured object from multiple directions, which can produce a very uniform overall lighting effect, especially suitable for printed matter with a flat or slightly curved surface (such as paper, labels and packaging box flat parts), multi-directional lighting also effectively fills the shadows that may be caused by the slight ups and downs of the surface or the detection angle, ensuring the uniformity of the brightness of the entire detected area, avoiding misjudgment, and cooperating with the camera 4, the printing color difference, dirt and overprint deviation can be detected.

[0050] When the roller 554 contacts the chute 561, the roller 554 gradually extrudes the receiving frame 56 during the rolling of the roller 554 along the chute 561, and the receiving frame 56 and the guide block 562 as a whole move upwards along the guide rod 521, and by the same reasoning, the cover plate one 67 rotates reversely around the axis of the transmission rod 65, and the cover plate two 68 rotates reversely around the axis of the movement rod 66, when the guide block 553 and the limiting block 531 are in mutual resistance and return to the initial position, the positions of the roller 554 and the receiving frame 56 remain fixed, at this time, the cover plate one 67 shields the annular light source 631, and the cover plate two 68 does not shield the strip-shaped light source 641, and the irradiation mechanism 6 switches to the strip-shaped lighting state, the strip-shaped light source 641 obliquely irradiates the printed matter, the strip-shaped light source 641 is essentially linear, and the light rays mainly diffuse along its length direction and have clear directionality in the width direction, which enables it to provide highly directional illumination, when the strip-shaped light source 641 irradiates the surface of the object, any edge perpendicular to the direction of the light rays (such as the edges of printed characters, scratches, burrs, edges of concave-convex structures) will produce obvious shadows on the other side, which greatly enhances the contrast of the edge features, making them very prominent in the image, and cooperating with the camera 4, scratches, indentations and texture defects on the printed matter such as paper and labels can be detected.

[0051] After the detection is completed, the conveying belt 2 continues to operate and transports the object plate 3 on which the printed matter is placed to subsequent production and processing equipment, the next object plate 3 enters the conveying belt 2 again, and the above steps are repeated.

[0052] It should be noted that the above examples are only used to illustrate the technical solutions of the present application but not to limit the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalently replaced, without departing from the spirit and scope of the technical solutions of the present application, and all these modifications and equivalents should be included in the scope of the claims of the present application.

Claims

1. A visual inspection device for printed matter, comprising a frame (1), a conveyor belt (2) disposed on the frame (1), a carrier plate (3) transported by the conveyor belt (2) and used for placing printed matter, and a camera (4) disposed on the frame (1) with its monitoring end facing the conveyor belt (2). Its features are, The frame (1) is equipped with a traction mechanism (5) and an irradiation mechanism (6). The irradiation mechanism (6) is set with a ring-shaped lighting state and a strip-shaped lighting state. The traction mechanism (5) is used to synchronize the movement of the loading plate (3) along the conveyor belt (2) and control the irradiation mechanism (6) to switch between the ring-shaped lighting state and the strip-shaped lighting state. The illumination mechanism (6) includes a device housing (61), a transmission component (62), a lamp housing one (63) and a lamp housing two (64). A ring light source (631) and a cover plate one (67) are provided on the lamp housing one (63). A strip light source (641) and a cover plate two (68) are provided on the lamp housing two (64). In the ring illumination state, the cover plate one (67) does not block the ring light source (631) and the cover plate two (68) blocks the strip light source (641). In the strip illumination state, the cover plate one (67) blocks the ring light source (631) and the cover plate two (68) does not block the strip light source (641).

2. The visual inspection device for printed materials according to claim 1, characterized in that, A slider (31) is fixedly connected to the loading plate (3). There are two sets of sliders (31). A spherical block (32) is fixedly connected to one set of sliders (31). A slide rail (11) is provided on the frame (1). The slider (31) and the slide rail (11) form a sliding guide fit.

3. The visual inspection device for printed materials according to claim 2, characterized in that, The traction mechanism (5) includes a support frame (51), a fixed frame (52), a motion component (55), a receiving frame (56), and a connecting rod (57). The support frame (51) and the fixed frame (52) are both fixedly installed on the frame (1). A guide rod (53) and a mounting rod (54) are fixedly connected on the support frame (51). One end of the guide rod (53) is fixedly connected to a limit block (531).

4. The visual inspection device for printed matter according to claim 3, characterized in that, The motion component (55) includes a trigger block (551), a guide block (553) and a counterweight (557). The trigger block (551) has a trigger ramp (5511) and an unlocking plane (5512) on one side. An L-shaped plate (552) is fixedly connected to the other side of the trigger block (551). A sliding column (555) is fixedly connected to the guide block (553) on the side facing the trigger block (551). The L-shaped plate (552) is sleeved on the surface of the sliding column (555). A return spring (556) is sleeved on the surface of the sliding column (555). The elastic force of the return spring (556) drives the L-shaped plate (552) to move away from the guide block (553).

5. A visual inspection device for printed matter according to claim 4, characterized in that, The guide rod (53) is arranged horizontally, the mounting rod (54) is arranged at an angle, the distance between the mounting rod (54) and the ground increases along the direction of movement of the load plate (3), the guide block (553) is fitted on the surface of the guide rod (53), the counterweight block (557) is fitted on the surface of the mounting rod (54), and the top of the guide block (553) is rotatably mounted with a roller (554).

6. The visual inspection device for printed matter according to claim 5, characterized in that, A connecting rod 1 (558) and a connecting rod 2 (559) are provided between the guide block (553) and the counterweight block (557). One end of the connecting rod 1 (558) is hinged to the counterweight block (557), the other end of the connecting rod 1 (558) is hinged to one end of the connecting rod 2 (559), and the other end of the connecting rod 2 (559) is hinged to the guide block (553).

7. A visual inspection device for printed materials according to claim 6, characterized in that, A guide rod (521) is fixedly connected to the top of the fixed frame (52). The guide rod (521) is arranged vertically. A guide block (562) is fixedly connected to the receiving frame (56). The guide block (562) is sleeved on the surface of the guide rod (521). A compression spring (522) is sleeved on the surface of the guide rod (521). The elastic force of the compression spring (522) drives the guide block (562) to move downward along the guide rod (521). A sloping groove (561) is provided at the bottom of the receiving frame (56). The distance between the sloping groove (561) and the ground increases along the direction of movement of the load plate (3).

8. A visual inspection device for printed materials according to claim 7, characterized in that, The equipment housing (61) is fixedly installed on the frame (1). Lamp housing 1 (63) and lamp housing 2 (64) are both fixedly installed on the outside of the equipment housing (61). A transmission rod (65) is rotatably installed on lamp housing 1 (63). Cover plate 1 (67) is fixedly installed on the surface of the transmission rod (65). A moving rod (66) is rotatably installed on lamp housing 2 (64). Cover plate 2 (68) is fixedly installed on the surface of the moving rod (66).

9. A visual inspection device for printed materials according to claim 8, characterized in that, The transmission assembly (62) includes a rotating rod (621), a rotating rod (622), and a connecting frame (628). The rotating rod (621) and the rotating rod (622) are rotatably installed inside the equipment housing (61). One end of the rotating rod (621) is fixedly connected to a worm gear (624). One end of the transmission rod (65) extends into the equipment housing (61). One end of the transmission rod (65) is fixedly connected to a worm wheel (623). The worm gear (624) meshes with the worm wheel (623). One end of the rotating rod (622) is fixedly connected to a worm gear (626). One end of the moving rod (66) extends into the equipment housing (61). One end of the moving rod (66) is fixedly connected to a worm wheel (625). The worm gear (626) meshes with the worm wheel (625). A belt drive component (627) is provided between the rotating rod (621) and the rotating rod (622).

10. A visual inspection device for printed matter according to claim 9, characterized in that, A stabilizing rod (629) is fixedly connected inside the equipment casing (61). The stabilizing rod (629) is arranged horizontally. A connecting frame (628) is fitted on the surface of the stabilizing rod (629). A gear (6221) is fixedly connected to the surface of the rotating rod (622). A rack (6281) is fixedly connected to one side of the connecting frame (628). The rack (6281) meshes with the gear (6221). One end of the connecting rod (57) is hinged to the receiving frame (56), and the other end of the connecting rod (57) is hinged to the connecting frame (628).

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