Printed matter defect detection device

Abstract

The utility model discloses a printed matter defect detection device, relates to the technical field of printed matter detection, and aims to solve the technical problem that the printing ink thickness detection precision is reduced due to the fact that the distance between a laser triangular displacement sensor and paperboards with different thicknesses is difficult to dynamically adjust in the conventional detection device. The shielding mechanisms are arranged on the two sides of the detection mechanism, and the detection mechanism is arranged on the upper surface of the conveying mechanism. According to the utility model, the pressing plate structure is designed and is in linkage connection with the support and the laser triangular displacement sensor, when the conveying belt conveys a paperboard-shaped printed matter to a detection area, the front edge of the printed matter is in contact with the upwarp bent end of the pressing plate and extrudes the upwarp bent end upwards, and the lifting height of the pressing plate corresponds to the thickness of the printed matter; the distance between the sensor and the printed matter is kept within an ideal range by driving the support to ascend and descend, the detection distance can be adjusted in a self-adaptive mode for the paperboard-shaped printed matter with the thickness ranging from 2.5 mm to 8 mm, detection deviation is reduced, and the detection precision and reliability of defects such as ink thickness are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to printed matter detection technical field more specifically, relate to a printed matter defect detection device. BACKGROUND

[0002] Printed matter as the important carrier of information dissemination and commodity packaging, is widely used in books, advertisement, packaging and other fields. Among them, the paperboard printed matter is often used in packaging box, carton and other products, such as electronic products, household appliances, and the thickness of the outer packaging box is usually between 2.5-8mm. The production of this kind of printed matter needs to go through plate making, printing, die cutting, film covering and other processes, and in the printing process, the uneven thickness of ink is prone to occur, which affects the appearance quality and use performance of the printed matter.

[0003] The existing printed matter defect detection device has certain limitations when facing the surface ink thickness detection of paperboard printed matter with different thickness. Since the detection laser triangulation displacement sensor is usually fixed on the equipment frame, when detecting paperboard printed matter with different thickness, the distance between the laser triangulation displacement sensor and the surface of the printed matter is difficult to dynamically adjust. If the distance between the laser triangulation displacement sensor and the printed matter is too close or too far, it will lead to the decline of detection precision and affect the detection effect. In view of this, we propose a printed matter defect detection device. UTILITY MODEL CONTENT

[0004] The utility model aims at overcoming the deficiency of prior art, adapting to the actual need, providing a printed matter defect detection device to solve the technical problem that the existing detection device is difficult to dynamically adjust the distance between the laser triangulation displacement sensor and the paperboard with different thickness, resulting in the decline of ink thickness detection precision.

[0005] To solve the above technical problems, the utility model provides the following technical scheme: a printed matter defect detection device, which comprises a shielding mechanism, a detection mechanism and a transmission mechanism, the shielding mechanism is arranged on both sides of the detection mechanism, and the detection mechanism is arranged on the upper surface of the transmission mechanism.

[0006] The detection mechanism comprises a frame, a support is arranged in the middle of the frame, a conduction unit is arranged on the upper surface of the support, a laser triangulation displacement sensor is arranged in the middle of the lower surface of the support, and a pressing plate is connected to the both ends of the lower surface of the support, one end of the pressing plate is in the shape of an upward curved structure, and the middle of the pressing plate is in the shape of a through structure.

[0007] Preferably, the shielding mechanism comprises a chassis, a baffle is rotatably installed on the chassis, and the surface of the baffle is in the shape of a wave structure.

[0008] Preferably, the transmission mechanism comprises a rack, a driving roller is rotatably arranged at one end inside the rack, a driven roller is rotatably arranged at the other end inside the rack, a transmission belt is arranged between the driving roller and the driven roller, and a push block is arranged on the transmission belt.

[0009] Preferably, sliding grooves are arranged at two sides inside the frame, and sliding blocks are slidably arranged in the sliding grooves and fixed at two ends of the support.

[0010] Preferably, the conduction unit comprises a jack hole arranged on a lower surface inside the frame, a contact piece is arranged in the jack hole, a contact rod is inserted into the contact piece, and the contact rod is fixed on an upper surface of the support.

[0011] Preferably, a socket is arranged on a side of the jack hole, a cylinder is inserted into the socket, and the cylinder is fixed on an upper surface of the support.

[0012] Preferably, notches are arranged at two sides of a lower surface of the pressing plate, and rollers are rotatably arranged in the notches.

[0013] Compared with the prior art, the utility model has the advantages that:

[0014] 1、The pressing plate structure is designed, and the pressing plate structure is connected with the support to drive the laser triangular displacement sensor, when the transmission belt conveys the paperboard-shaped printed matter to the detection area, the front edge of the printed matter first contacts the curved end of the pressing plate, and the pressing plate is gradually pressed upward in the transmission process, the lifting height of the pressing plate is linearly corresponding to the thickness of the printed matter, and then the support is driven to ascend and descend synchronously, so that the distance between the laser triangular displacement sensor and the surface of the printed matter is always kept in the ideal detection range of the laser triangular displacement sensor, the structure can adaptively adjust the detection distance for the paperboard-shaped printed matter with a thickness of 2.5-8mm, the detection deviation caused by the fixed distance is reduced, and the detection precision and reliability of surface defects such as uneven ink thickness are improved.

[0015] 2. The utility model discloses a pressing plate one end is designed as the curved structure of the upwarp, through the optimization camber, can form the guiding effect to the printed matter that moves on the transmission belt, reduces the collision resistance of printed matter edge and pressing plate, is convenient for its stable extrusion and enters below the pressing plate, the setting of the middle through -going structure provides the detection path of unobstructed for the laser beam of laser triangular displacement sensor, makes the laser that emits can be directly projected to the printed matter surface, avoids the detection blind area that leads to because the pressing plate entity blocks, this design guarantees the normal work of laser triangular displacement sensor, utilizes the contact of the entity part of pressing plate two sides and printed matter, realizes the limit support and linkage lifting function to printed matter, promotes the stability of detection process, through the design gyro wheel, when the paperboard printed matter on the transmission belt moves to below the pressing plate, gyro wheel and printed matter surface contact and roll, convert sliding friction into rolling friction, effectively reduce the friction between both, this structure can smooth guide printed matter and enter below the pressing plate, reduce transmission resistance, promote the fluency of detection process.

[0016] 3. The utility model discloses a design contact piece and contact stick structure, contact piece is designed as double half circle elastic sheet combination form, utilize the embracing force that the elastic deformation of elastic sheet produces, make contact stick always keep stable contact with contact piece both sides in the process of lifting, this structure passes through increasing contact area and pressure distribution uniformity, effectively reduced contact resistance and friction loss, when the pressing plate drives support to lift, the sliding conductive mode between contact piece and contact stick can reduce the wire fracture risk that leads to because repeatedly bending compared with traditional cable connection, prolongs the service life of conductive component, improves the stability of signal transmission simultaneously, further guarantees the continuous efficient operation of detection process. ACCURACY

[0017] Figure 1 It is the front view appearance structure schematic drawing of the utility model;

[0018] Figure 2 It is the baffle rotation opening structure schematic drawing of the utility model;

[0019] Figure 3 It is the transmission mechanism structure schematic drawing of the utility model;

[0020] Figure 4 It is the detection mechanism appearance structure schematic drawing of the utility model;

[0021] Figure 5 It is the detection mechanism internal structure schematic drawing of the utility model;

[0022] Figure 6 It is the conduction unit internal structure schematic drawing of the utility model;

[0023] Figure 7 It is the pressing plate plan view structure schematic drawing of the utility model;

[0024] Figure 8The utility model discloses a pressing plate bottom view structural schematic diagram.

[0025] Mark explanation in drawing:

[0026] 1, shielding mechanism, 101, undercarriage, 102, baffle, 2, detection mechanism, 201, frame, 202, support, 203, conduction unit, 2031, jack, 2032, contact piece, 2033, contact stick, 2034, slot, 2035, cylinder, 204, laser triangulation displacement sensor, 205, pressing plate, 206, sliding slot, 207, sliding block, 208, recess, 209, gyro wheel, 3, transmission mechanism, 301, rack, 302, driving roller, 303, driven roller, 304, transmission belt, 305, push block. Specific implementation

[0027] As Figures 1 to 8 The utility model relates to a kind of printed matter defect detection devices, including shielding mechanism 1, detection mechanism 2 and transmission mechanism 3, shielding mechanism 1 is arranged in detection mechanism 2 both sides, detection mechanism 2 is arranged on the upper surface of transmission mechanism 3.

[0028] The detection mechanism 2 includes a frame 201, a support 202 is arranged in the middle of the inside of the frame 201, a conduction unit 203 is arranged in the middle of the upper surface of the support 202, a laser triangulation displacement sensor 204 is arranged in the middle of the lower surface of the support 202, and pressing plates 205 are connected to the two ends of the lower surface of the support 202; one end of the pressing plate 205 is in the shape of an upwardly curved structure, and the middle of the pressing plate 205 is in the shape of a penetrating structure. The laser triangulation displacement sensor 204 can detect the three-dimensional profile information of the surface of the printed matter in a non-contact manner through the laser triangulation principle. Specifically, after the laser beam emitted by the laser triangulation displacement sensor 204 is reflected by the surface of the printed matter, the reflected laser beam is focused on the image sensor by the imaging lens; by analyzing the change in the light spot position, the uneven ink thickness, local protrusions or depressions and other defects on the surface of the printed matter can be accurately identified. By designing the structure of the pressing plate 205, the pressing plate 205 is connected to the support 202 and the laser triangulation displacement sensor 204 in linkage; when the paperboard-shaped printed matter is conveyed to the detection area by the conveying belt 304, the leading edge of the printed matter first contacts the curved end of the pressing plate 205, and the conveying process gradually presses the pressing plate 205 upward; the lifting height of the pressing plate 205 is in linear correspondence with the thickness of the printed matter, thereby driving the support 202 to ascend and descend synchronously, so that the distance between the laser triangulation displacement sensor 204 and the surface of the printed matter is always kept within the ideal detection range of the laser triangulation displacement sensor 204; for the paperboard-shaped printed matter with a thickness of 2.5-8 mm, the structure can adaptively adjust the detection distance, reduce the detection deviation caused by the fixed distance, and improve the detection accuracy and reliability of the uneven ink thickness and other surface defects. One end of the pressing plate 205 is designed as an upwardly curved structure, and by optimizing the curvature of the curved surface, the printed matter moving on the conveying belt 304 can be guided, the collision resistance between the edge of the printed matter and the pressing plate 205 is reduced, and the printed matter can be conveniently and stably pressed into the lower part of the pressing plate 205. The middle penetrating structure provides an unobstructed detection path for the laser beam of the laser triangulation displacement sensor 204, so that the emitted laser can be directly projected onto the surface of the printed matter, and the detection blind area caused by the obstruction of the pressing plate 205 is avoided. The design ensures the normal operation of the laser triangulation displacement sensor 204, and at the same time, the entity parts on both sides of the pressing plate 205 contact the printed matter, so that the printed matter is limited and supported and lifted in linkage, and the stability of the detection process is improved.

[0029] In the embodiment of the utility model, the shielding mechanism 1 includes a chassis 101, a baffle 102 is rotatably installed on the chassis 101, and the surface of the baffle 102 is in the shape of a wave structure. The baffle 102 of the utility model can effectively shield the influence of external electromagnetic interference and light sources on the laser triangulation displacement sensor 204. The surface of the baffle 102 is designed in a wave structure, which can disperse and weaken external conducted electromagnetic interference by increasing the reflection path and surface area, thereby further improving the stability of the working environment of the laser triangulation displacement sensor 204.

[0030] In the embodiment of the utility model, transmission mechanism 3 includes frame 301, one end of inside frame 301 rotatably installs driving roller 302, the other end of inside frame 301 rotatably installs driven roller 303, and driven roller 303 and driving roller 302 are arranged with transmission belt 304 between, and transmission belt 304 is arranged with push block 305. The utility model discloses a driving roller 302 and driven roller 303 structure are designed for transmission belt 304 provides stable rotating support structure, and the even distribution push block 305 on the surface of transmission belt 304 is contacted with the edge of printed matter, forms flexible pushing mechanism, makes the paperboard printed matter keep stable posture in the transmission process, when printed matter moves to the front end of pressing plate 205, the continuous propulsion of push block 305 and the warping surface on pressing plate 205 synergistic effect, guide printed matter to be extruded into the below of pressing plate 205 smoothly, realize the progressive lifting of pressing plate 205, this design guarantees transmission efficiency, and through the linkage of push block 305 and pressing plate 205 realizes the limiting and guiding function of printed matter.

[0031] In the embodiment of the utility model, the both sides of inside frame 201 are provided with sliding slot 206, and sliding block 207 is slidably arranged in sliding slot 206, and the both ends of support 202 are fixed with sliding block 207. The utility model discloses the sliding pair structure of sliding slot 206 and sliding block 207 in frame 201 provides the guiding path that support 202 can stably lift along the vertical direction, effectively improves the stability of mechanism operation.

[0032] In the embodiment of the utility model, the both sides of inside frame 201 are provided with sliding slot 206, and sliding block 207 is slidably arranged in sliding slot 206, and the both ends of support 202 are fixed with sliding block 207. The utility model discloses the sliding pair structure of sliding slot 206 and sliding block 207 in frame 201 provides the guiding path that support 202 can stably lift along the vertical direction, effectively improves the stability of mechanism operation.

[0033] In the embodiment of the utility model, the jack 2031 side is arranged with the slot 2034, the slot 2034 is inserted with the cylinder 2035, and the cylinder 2035 is fixed on the support 202 upper surface.The utility model discloses a slot 2034 and cylinder 2035 structure are designed, when the support 202 is lifted, the cylinder 2035 is followed in the slot 2034, and the retractable sealing barrier is formed, the design protects the jack 2031 through dynamic sealing, effectively reduces the invasion of external dust and other impurities, reduces the risk of poor contact of the contact stick 2033 and the contact piece 2032, and guarantees the conductivity stability.

[0034] In the embodiment of the utility model, the lower surface of the pressing plate 205 is provided with notches 208 on both sides, and the notches 208 are rotatably installed with rollers 209.The utility model discloses a roller 209 when the paperboard-shaped printed matter on the transmission belt 304 moves to the lower side of the pressing plate 205, the roller 209 is in contact with the surface of the printed matter and rolls, and the sliding friction is converted into rolling friction, so that the friction between the two is effectively reduced, the structure can smoothly guide the printed matter into the lower side of the pressing plate 205, reduce the transmission resistance, and improve the smoothness of the detection process.

[0035] Working principle: the embodiment provides a printed matter defect detection device, and when in use, the staff needs to first power the utility model, controls the utility model to run through the control panel, and places the printed paperboard-shaped printed matter on the transmission belt 304 on the transmission mechanism 3, after placing on the surface, the staff starts the driving motor, the driving motor rotates the driving roller 302, the driving roller 302 cooperates with the transmission belt 304 between the driving roller 302 and the driven roller 303, the transmission belt 304 rotates, and the printed matter placed on the surface thereof moves, and then moves to the lower side of the frame 201 in the detection mechanism 2, when moving to the lower side of the frame 201, the printed matter is pushed to the lower side of the pressing plate 205 by the push block 305 installed on the surface of the transmission belt 304, and the pressing plate 205 is squeezed, after the pressing plate 205 is squeezed, the bracket 202 is lifted together, after the bracket 202 is lifted, the laser triangulation displacement sensor 204 installed on the surface thereof is lifted synchronously, so that the distance between the laser triangulation displacement sensor 204 and the printed matter with different thicknesses is kept unchanged, the laser triangulation displacement sensor 204 detects the surface of the printed matter, when the unqualified printed matter is detected, the transmission belt 304 moves out from under the frame 201 and stops, and the staff can take off the unqualified printed matter from the transmission belt 304, when the staff needs to check and maintain the detection mechanism 2, the staff can hold the handle and rotate the baffle 102 in the shielding mechanism 1 to open, after opening, the staff can conveniently check and maintain the detection mechanism 2.

[0036] The utility model discloses an embodiment discloses the better embodiment, but is not limited to this, and the ordinary skill of the art, the spirit of the utility model is appreciated to the above -mentioned embodiment, and different extension and change are made, but as long as not departing from the spirit of the utility model, all are in the protection range of the utility model.

Claims

1. A printed matter defect detection apparatus characterized by comprising: Including shielding mechanism (1), detection mechanism (2) and transmission mechanism (3), the shielding mechanism (1) is arranged on both sides of detection mechanism (2), the detection mechanism (2) is arranged on the upper surface of transmission mechanism (3); The detection mechanism (2) includes frame (201), the frame (201) is arranged with support (202) in the middle, the support (202) is arranged with conductive unit (203) on the upper surface, the support (202) is arranged with laser triangulation displacement sensor (204) on the lower surface, the support (202) is connected with pressing plate (205) at both ends of the lower surface, the pressing plate (205) is in the shape of curved structure on one end, and the pressing plate (205) is in the shape of through structure in the middle.

2. A printed product defect detection apparatus according to claim 1, characterized in that: The shielding mechanism (1) includes chassis (101), the chassis (101) is rotatably installed with baffle (102) on the upper surface, and the baffle (102) is in the shape of wave structure.

3. A printed product defect detection apparatus according to claim 2, characterized in that: The transmission mechanism (3) includes rack (301), the rack (301) is rotatably installed with driving roller (302) at one end, the rack (301) is rotatably installed with driven roller (303) at the other end, the transmission belt (304) is arranged between the driven roller (303) and the driving roller (302), and the pushing block (305) is arranged on the transmission belt (304).

4. A printed product defect detection apparatus according to claim 3, characterized in that: The frame (201) is provided with sliding groove (206) on both sides, the sliding groove (206) is slidably connected with sliding block (207), and the sliding block (207) is fixed at both ends of the support (202).

5. A printed product defect detection apparatus according to claim 4, characterized in that: The conductive unit (203) includes the jack (2031) opened in the lower surface of the frame (201), the contact piece (2032) is arranged in the jack (2031), the contact rod (2033) is inserted into the contact piece (2032), and the contact rod (2033) is fixed on the upper surface of the support (202).

6. A printed product defect detection apparatus according to claim 5, wherein: The jack (2031) is arranged with the insertion groove (2034) on the side, the cylinder (2035) is inserted into the insertion groove (2034), and the cylinder (2035) is fixed on the upper surface of the support (202).

7. A printed product defect detection apparatus according to claim 6, characterized in that: The lower surface of the pressing plate (205) is provided with recess (208) on both sides, and the roller (209) is rotatably installed in the recess (208).

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