Detection equipment for detecting printing quality

Abstract

The invention discloses detection equipment for detecting printing quality, and relates to the technical field of printing machines. The device comprises a detection table, a cleaning table is arranged on one side of the detection table, a detection frame is fixedly installed at the top of the detection table, a visual identification instrument facing the detection table is fixedly installed at the top of the detection frame, and two lighting lamps are fixedly installed at the top of the detection frame; the two lighting lamps face the detection table and are distributed on the two sides of the visual identification instrument. By arranging the ink suction assembly, when a printed matter penetrates through the bottom of the dust suction cylinder, a dust collector sucks dust, sundries and the like on the upper surface of the paper printed matter through a dust suction opening, so that the influence on subsequent shooting detection is reduced, and meanwhile, a false dry ink layer on the surface of the printed matter is separated from the surface of the paper product under suction of the dust collector; therefore, the ink layer which is easy to fall off is directly absorbed and removed, so that the judgment result of subsequent shooting detection is prevented from being interfered.

Description

Technical Field

[0001] The invention relates to the technical field of printing machines, and in particular to a detection device for detecting printing quality. Background Art

[0002] When printing plants are printing paper products, some products often fail to meet the printing quality standards. In order to eliminate products that fail to meet the printing quality standards, testing equipment is generally used to conduct real-time testing of the printing quality of the paper. Currently, a commonly used testing method is to use a visual recognition system to scan the product and compare it with the optical effects of a standard colorimetric card or a standard product in the same environment to identify the failed products.

[0003] Although the existing visual recognition system detection equipment can detect defective products with color difference, missing printing, overprinting, wrong printing and other problems, the "false drying of ink phenomenon" often occurs in the printing process of paper products, that is, the ink is over-dried and the ink layer becomes brittle. The ink layer on the surface of the printed product will fall off during the subsequent processing or after the finished product. Or because the ink is left for a long time or stirred unevenly, various additives and pigments in the ink will be free and stratified due to different densities, which will cause the ink layer on the printed product to fall off in powder form within a short time after printing. Some paper printed products with the false drying of ink will not have printing problems such as color difference on the surface, so it is difficult to be detected by the visual system, which leads to the actual screening effect being less than expected. For this reason, a detection device for detecting printing quality is proposed. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that paper printed products with pseudo-drying ink have no obvious color difference on their surface, which makes it difficult to be detected by the visual system, thereby resulting in the actual screening effect being less than expected. The present invention provides a detection device for detecting printing quality.

[0005] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions: A testing device for testing printing quality, comprising a testing table, a cleaning table is arranged on one side of the testing table, a testing frame is fixedly installed on the top of the testing table, a visual recognition instrument facing the testing table is fixedly installed on the top of the testing frame, two lighting lamps are fixedly installed on the top of the testing frame, both of the two lighting lamps are facing the testing table and distributed on both sides of the visual recognition instrument, an inner light shield is fixedly installed on the top of the testing frame, the testing frame, the visual recognition instrument and the lighting lamps are all located inside the inner light shield, and an ink absorbing component is arranged at the bottom of the cleaning table; The ink suction component absorbs the dried ink on the surface of the paper print by using negative pressure to remove the ink layer that is easy to fall off. The ink suction component includes a vacuum cleaner fixedly installed on one side of the bottom of the cleaning table, and a three-way vacuum tube is fixedly installed on the air inlet of the vacuum cleaner. Both top ends of the three-way vacuum tube extend to the top of the cleaning table and are fixedly installed with a hanging tube. Two hanging brackets are fixedly installed on the top of the cleaning table, and the two hanging tubes are respectively fixedly installed on the two hanging brackets. The same vacuum cylinder is fixedly installed between the two hanging brackets, and a vacuum port is opened at the bottom of the vacuum cylinder. The top of the cleaning table is provided with a cleaning component for cleaning the ink layer on the paper print that is easy to fall off and not removed by the ink absorbing component. The cleaning component includes a cleaning bracket fixedly installed on the top of the cleaning table, the cleaning bracket is located between the dust suction cylinder and the inner light shielding cover, two vertically arranged lifting electric push rods are fixedly installed on the top of the cleaning bracket, the telescopic ends of the lifting electric push rods are both downward and fixedly installed with lifting brackets, the two lifting brackets are rotatably installed with the same horizontally arranged rotating shaft, a plurality of cotton cloth brackets uniformly distributed along the axis of the rotating shaft are fixedly installed on the circumferential side of the rotating shaft, a positioning plate is fixedly installed on the side of the cotton cloth bracket away from the rotating shaft, a Velcro is fixedly installed on the side of the positioning plate away from the cotton cloth bracket, and a cleaning cotton cloth is placed on the side of the Velcro away from the positioning plate, a transposition motor is fixedly installed on one side of one of the lifting brackets, the output shaft of the transposition motor is drivingly connected to the rotating shaft, a lifting slide is fixedly installed on one side of the transposition motor, and the lifting slide is slidably installed on the cleaning bracket.

[0006] Furthermore, a cleaning air duct connected to the interior of the dust collection cylinder is fixedly mounted on the side wall of the dust collection cylinder, and one end of the cleaning air duct faces the rotating shaft.

[0007] Furthermore, a front speed measuring frame and a rear speed measuring frame are fixedly installed on the top of the detection platform, the front speed measuring frame is located on the side of the detection frame close to the cleaning bracket, and the rear speed measuring frame is located on the side of the detection frame away from the cleaning bracket, and vertically arranged spring rods are fixedly installed on both sides of the front speed measuring frame and the rear speed measuring frame, and the telescopic ends of the spring rods are downward and rotatably installed with horizontally arranged guide wheels.

[0008] Furthermore, a torque sensor is fixedly mounted on one side of the bottom end of the spring rod, and a sensing end of the torque sensor located at the same position is connected to one end of the guide wheel.

[0009] Furthermore, the guide wheels are all sleeved with dustproof covers.

[0010] Furthermore, the same inkjet rack is fixedly installed on the top of the detection rack and the rear speed measuring rack, a positioning ink barrel is fixedly installed on the top of the inkjet rack, a micro pump is fixedly installed on the bottom end of the positioning ink barrel, an inkjet tube is fixedly installed on the output end of the micro pump, the position of the inkjet tube corresponds to the position of the visual recognition instrument, and the bottom end of the inkjet tube faces the detection table.

[0011] Furthermore, two positioning brackets are fixedly installed on the top of the cleaning table, and the same positioning frame is fixedly installed on the top of the two positioning brackets. The positioning frame corresponds to the position of the rotating shaft, and the positioning frame is adapted to the positioning plate.

[0012] Furthermore, a same dustproof sleeve is fixedly installed between the two lifting brackets, the rotating shaft is located inside the dustproof sleeve, and clearance holes are provided at the top and bottom of the dustproof sleeve. A same external light shielding cover is fixedly installed on the top of the inspection table and the cleaning table, and a cloth changing door corresponding to the position of the dustproof sleeve is rotatably installed on one side of the external light shielding cover.

[0013] The beneficial effects of the present invention are as follows: 1. The present invention is provided with an ink suction component, so that when the paper print passes through the bottom of the dust suction cylinder, the vacuum cleaner will generate a certain suction force on the upper surface of the paper print through the dust suction port, so that the dust and debris on the surface of the paper print are sucked away, thereby reducing the impact on the subsequent shooting and detection. At the same time, the pseudo-dry ink layer on the surface of the printed product is separated from the surface of the paper product under the suction of the vacuum cleaner, so that the ink layer that is easy to fall off is directly sucked away, so as to avoid interference with the judgment result of the subsequent shooting and detection; 2. The present invention provides a cleaning component so that when the printed product passes through the bottom of the rotating shaft, the upper surface of the printed product will contact the lower surface of the cleaning cotton cloth located at the bottom, and then the cleaning cotton cloth will wipe the upper surface of the printed product, so that the ink layer that is falsely dry and not absorbed by the ink absorption component is wiped off by the cleaning cotton cloth, so that the printed product that originally has the phenomenon of false ink drying or the ink layer that is easy to fall off due to other factors can be exposed in advance before being sent for inspection, so that it can be identified in the subsequent shooting inspection; 3. The present invention sets a lifting electric push rod so that the lifting electric push rod can apply pressure to the printed matter to ensure that the ink layer that is easy to fall off can be wiped off. At the same time, after the cleaning cotton cloth is used for a long time, the lifting electric push rod controls the rotating shaft to move upward as a whole, and the shifting motor drives the cleaning cotton cloth to shift. When the shifted cleaning cotton cloth finally moves to the top, the cleaning cotton cloth can be torn off and replaced with a new cleaning cotton cloth, and then the lifting electric push rod drives the rotating shaft to reset, ensuring that the lower surface of the cleaning cotton cloth will not accumulate too much ink layer, ink shell and other debris; 4. The present invention is provided with a cleaning air duct, so that while the dust collection cylinder vacuums the upper surface of the paper product through the dust collection port, the dust collection cylinder vacuums the upper surface of the printed matter located at the bottom of the rotating shaft through the cleaning air duct on the other side, so that the ink layer wiped off the surface of the printed matter by the cleaning cotton cloth and the ink layer accumulated on the cleaning cotton cloth are vacuumed, thereby keeping the printed matter clean and extending the service life of the cleaning cotton cloth; 5. The present invention provides guide wheels so that after the printed matter is transported to the inside of the inner light shield, the four corners of the printed matter located inside the inner light shield will contact the guide wheels, and at the same time, the four spring rods will respectively apply a certain pressure to the guide wheels, so that the printed matter is kept in a flat state inside the inner light shield, thereby reducing the appearance of wrinkles on the printed matter and reducing the impact on the shooting detection of the visual recognition device; 6. The present invention provides a torque sensor so that when the printed matter is transported inside the inner light shield, the four guide wheels are driven to rotate synchronously, thereby driving the sensing end of the torque sensor to rotate. Then, the movement process of the four guide wheels is monitored in real time, and the transportation process of the printed matter inside the inner light shield is monitored, thereby ensuring that the single movement amount of the printed matter is within the standard range. 7. The present invention provides a dust cover so that the dust cover replaces the guide wheel to contact the upper surface of the printed product. The dust cover can avoid scratches on the upper surface of the printed product by the guide wheel due to its softness and elasticity. At the same time, the dust cover can produce a certain elastic deformation under the elastic force of the spring rod, thereby increasing the contact area with the printed product, thereby increasing the friction force and preventing the guide wheel from slipping. After the detection device is used for a long time, the dust cover can be removed separately for cleaning to ensure the cleanliness of the dust cover. 8. The present invention sets a positioning ink barrel so that when the visual recognition instrument detects that the part of the current printed matter being inspected has printing errors, problems or unqualified printing quality, the micro pump will be started to extract ink from the positioning ink barrel and print it on the upper surface of the printed matter through the inkjet tube to mark the unqualified part of the printed matter, so as to facilitate subsequent staff or other equipment to remove the part; 9. The present invention provides a positioning frame so that after the transposition motor transposes the cleaning cotton cloth, the lifting electric push rod drives the positioning plate at the bottom to contact the positioning frame. If the positioning plate is deviated to a certain extent, the positioning plate will drive the rotating shaft to rotate under the pressure of the positioning frame as the lifting electric push rod is driven until the positioning plate and the positioning frame are completely pressed flat, thereby ensuring that the lower surface of the cleaning cotton cloth and the upper surface of the printed matter are kept in a pressed flat state; 10. The present invention provides a dust-proof sleeve and an outer light-shielding cover so that both the dust-proof sleeve and the outer light-shielding cover can prevent dust from entering the interior. The dust-proof sleeve only retains two upper and lower holes for replacing the cleaning cotton cloth and for the cleaning cotton cloth to contact the printed matter. At the same time, the outer light-shielding cover can also be located at the outermost part to block the external ambient light, and cooperate with the internal light-shielding cover to prevent the ambient light from affecting the shooting detection of the visual recognition device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the detection table and the cleaning table of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the detection platform of the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the detection frame and the rear speed measuring frame of the present invention; Figure 5 The present invention Figure 4 Schematic diagram of the structure at A in the middle; Figure 6 It is a schematic diagram of the three-dimensional structure of the vacuum cleaner and the dust collection tube of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the cleaning component of the present invention; Figure 8 The present invention Figure 7 Schematic diagram of the structure at B in the middle; Figure numerals: 1, test table; 2, cleaning table; 3, test frame; 4, visual recognition instrument; 5, lighting lamp; 6, inner light shield; 7, vacuum cleaner; 8, three-way vacuum pipe; 9, hanging pipe; 10, hanging bracket; 11, vacuum cylinder; 12, vacuum port; 13, cleaning bracket; 14, lifting electric push rod; 15, lifting bracket; 16, rotating shaft; 17, cotton cloth bracket; 18, positioning plate; 19, Velcro; 20, Cleaning cotton cloth; 21. Transposition motor; 22. Lifting slide plate; 23. Cleaning air duct; 24. Front speed measuring frame; 25. Rear speed measuring frame; 26. Spring rod; 27. Guide wheel; 28. Torque sensor; 29. ​​Dust cover; 30. Inkjet frame; 31. Positioning ink barrel; 32. Micro pump; 33. Inkjet tube; 34. Positioning bracket; 35. Positioning frame; 36. Dust cover; 37. External light shield; 38. Cloth changing door. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0016] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0018] In the description of the embodiments of the present invention, it should be noted that the terms "inside", "outside", "upper", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0019] like Figures 1 to 8 As shown, a testing device for testing printing quality includes a testing station 1, as shown in Figure 2 As shown, a cleaning station 2 is provided on one side of the detection station 1. In this embodiment, a group of conveying rollers are provided at the front and rear of the detection device for conveying paper products. Figure 3 As shown, a detection frame 3 is fixedly installed on the top of the detection platform 1, and a visual recognition instrument 4 facing the detection platform 1 is fixedly installed on the top of the detection frame 3. Figure 4 As shown, two lighting lamps 5 are fixedly installed on the top of the detection frame 3, and the two lighting lamps 5 are both facing the detection platform 1 and distributed on both sides of the visual recognition instrument 4, as shown in FIG. Figure 2As shown, an inner light shielding hood 6 is fixedly installed on the top of the detection frame 3, and the detection frame 3, the visual recognition instrument 4 and the lighting lamp 5 are all located inside the inner light shielding hood 6. In the present embodiment, through holes are provided at the front and rear of the inner light shielding hood 6 for paper products to pass through, and an ink absorbing assembly is provided at the bottom of the cleaning table 2; specifically, when the detection device for detecting printing quality is in use, the paper printed matter slides on the top of the detection table 1 and the cleaning table 2 driven by a conveying device such as a transmission roller, and the visual recognition instrument 4 located inside the inner light shielding hood 6 can visually scan and recognize the ink marks such as text and patterns printed on the surface of the bottom paper printed matter under the light shielding protection of the inner light shielding hood 6 and the lighting effect of the lighting lamp 5, to ensure that there will be no printing errors such as misprinting and missing printing, and at the same time, the photographed picture is compared with a standard colorimetric card or a standard finished product, so as to identify defective products with printing problems such as too light, too dark or uneven ink color; The ink absorber absorbs the dried ink on the surface of the paper print by using negative pressure to remove the ink layer that is easy to fall off. Figure 2 As shown, the ink absorbing assembly includes a vacuum cleaner 7 fixedly mounted on one side of the bottom of the cleaning table 2. Figure 6 As shown, a three-way dust suction pipe 8 is fixedly installed at the air inlet of the vacuum cleaner 7, and the two top ends of the three-way dust suction pipe 8 extend to the top of the cleaning table 2 and are fixedly installed with a hanging pipe 9, as shown in FIG. Figure 2 As shown, two suspension brackets 10 are fixedly installed on the top of the cleaning table 2, and two suspension pipes 9 are fixedly installed on the two suspension brackets 10 respectively. A same dust collection cylinder 11 is fixedly installed between the two suspension brackets 10. Figure 6 As shown, a dust suction port 12 is provided at the bottom of the dust suction cylinder 11; specifically, by setting an ink suction component, before the paper print is sent into the inner light shielding cover 6 for visual recognition, it will first pass through the bottom of the dust suction cylinder 11, and at this time, the vacuum cleaner 7 will extract the air inside the dust suction cylinder 11 through the three-way dust suction pipe 8 and the hanging pipe 9, so that a negative pressure is formed inside the dust suction cylinder 11, so that the dust suction cylinder 11 generates a certain suction force on the upper surface of the paper print through the dust suction port 12 at the bottom, so that dust, sundries and the like on the surface of the paper print are sucked away, thereby reducing the impact on subsequent shooting and detection, and at the same time, the pseudo-dry ink layer on the surface of the print is separated from the surface of the paper product under the suction of the vacuum cleaner 7, so that the ink layer that is easy to fall off is directly sucked away, so as to avoid interference with the judgment result of subsequent shooting and detection; The top of the cleaning station 2 is provided with a cleaning component for cleaning the ink layer on the paper printed matter that is easy to fall off and is not removed by the ink absorbing component, such as Figure 2 As shown, the cleaning assembly includes a cleaning bracket 13 fixedly mounted on the top of the cleaning table 2, and the cleaning bracket 13 is located between the dust collection cylinder 11 and the inner light shielding cover 6. Figure 7As shown, two vertically arranged lifting electric push rods 14 are fixedly installed on the top of the cleaning bracket 13, and the telescopic ends of the lifting electric push rods 14 are both downwardly facing and fixedly installed with lifting brackets 15, and the same horizontally arranged rotating shaft 16 is rotatably installed on the two lifting brackets 15, as shown in FIG. Figure 8 As shown, a plurality of cotton cloth brackets 17 evenly distributed along the axis of the rotating shaft 16 are fixedly installed on the peripheral side of the rotating shaft 16, and a positioning plate 18 is fixedly installed on the side of the cotton cloth bracket 17 away from the rotating shaft 16, and a Velcro 19 is fixedly installed on the side of the positioning plate 18 away from the cotton cloth bracket 17, and a cleaning cotton cloth 20 is placed on the side of the Velcro 19 away from the positioning plate 18, as shown in FIG. Figure 7 As shown, a transposition motor 21 is fixedly installed on one side of one lifting bracket 15, and the output shaft of the transposition motor 21 is drivingly connected to the rotating shaft 16. A lifting slide 22 is fixedly installed on one side of the transposition motor 21, and the lifting slide 22 is slidably installed on the cleaning bracket 13; specifically, by setting a cleaning component, when the printed product passes through the bottom of the rotating shaft 16, the upper surface of the printed product will contact the lower surface of the cleaning cotton cloth 20 located at the bottom, and then the cleaning cotton cloth 20 will wipe the upper surface of the printed product, so that the ink layer that is falsely dry and not absorbed by the ink absorption component is wiped off by the cleaning cotton cloth 20, so that the printed product that originally has the phenomenon of false drying of ink or the ink layer that is easy to fall off due to other factors will be exposed in advance before being sent for inspection, so as to be taken in the subsequent shooting It is identified during the detection. By setting the lifting electric push rod 14, the lifting electric push rod 14 can control the cleaning cotton cloth 20 at the bottom to approach the printed product, so that the cleaning cotton cloth 20 applies a certain pressure to the printed product, thereby ensuring that the ink layer that is easy to fall off can be wiped off by the cleaning cotton cloth 20. At the same time, after the cleaning cotton cloth 20 has been used for a long time, the lifting electric push rod 14 controls the rotating shaft 16 to move upward as a whole, and the transposition motor 21 drives the rotating shaft 16 to rotate and transpose, so that the new cleaning cotton cloth 20 turns to the bottom. When the displaced cleaning cotton cloth 20 finally moves to the top, the cleaning cotton cloth 20 can be torn off and replaced with a new cleaning cotton cloth 20, and then the lifting electric push rod 14 drives the rotating shaft 16 to reset, thereby ensuring that the lower surface of the cleaning cotton cloth 20 will not accumulate too much ink layer, ink shell and other debris.

[0020] like Figure 6 As shown, a cleaning air duct 23 connected to the inside of the dust collection cylinder 11 is fixedly installed on the side wall of the dust collection cylinder 11, and one end of the cleaning air duct 23 faces the rotating shaft 16; specifically, by providing the cleaning air duct 23, while the dust collection cylinder 11 vacuums the upper surface of the paper product through the dust suction port 12, the dust collection cylinder 11 will suction the upper surface of the printed matter located at the bottom of the rotating shaft 16 through the cleaning air duct 23 on the other side, so that the ink layer wiped off the surface of the printed matter by the cleaning cotton cloth 20 and the ink layer accumulated on the cleaning cotton cloth 20 are sucked, thereby keeping the printed matter clean and extending the service life of the cleaning cotton cloth 20.

[0021] like Figure 3 As shown, a front speed measuring frame 24 and a rear speed measuring frame 25 are fixedly installed on the top of the detection platform 1. The front speed measuring frame 24 is located on the side of the detection frame 3 close to the cleaning bracket 13, and the rear speed measuring frame 25 is located on the side of the detection frame 3 away from the cleaning bracket 13. Figure 5 As shown, vertically arranged spring rods 26 are fixedly installed on both sides of the front speed measuring frame 24 and the rear speed measuring frame 25, and the telescopic ends of the spring rods 26 are downwardly facing and rotatably installed with horizontally arranged guide wheels 27; specifically, by setting the guide wheels 27, after the printed matter is conveyed to the interior of the inner light shielding cover 6, the four corners of the printed matter located inside the inner light shielding cover 6 will contact the guide wheels 27, and at the same time, the four spring rods 26 will respectively apply a certain pressure to the guide wheels 27, so that the printed matter is kept in a flat state inside the inner light shielding cover 6, thereby reducing the appearance of wrinkles on the printed matter and reducing the impact on the shooting and detection of the visual recognition device 4.

[0022] like Figure 5 As shown, a torque sensor 28 is fixedly installed on one side of the bottom end of the spring rod 26, and the sensing end of the torque sensor 28 located at the same place is connected to one end of the guide wheel 27; specifically, by setting the torque sensor 28, when the printed matter is transported inside the inner light shielding cover 6, it will drive the four guide wheels 27 to rotate synchronously, thereby driving the sensing end of the torque sensor 28 to rotate, and then by real-time monitoring of the movement process of the four guide wheels 27, the transportation process of the printed matter inside the inner light shielding cover 6 is monitored, thereby ensuring that the single movement amount of the printed matter is within the standard range.

[0023] like Figure 5 As shown, the guide wheels 27 are all sleeved with dust-proof leather boots 29. In the present embodiment, the dust-proof leather boots 29 are made of soft rubber material. Specifically, by setting the dust-proof leather boots 29, the dust-proof leather boots 29 are tensioned and sleeved on the guide wheels 27, so that the dust-proof leather boots 29 replace the guide wheels 27 to contact the upper surface of the printed matter. The softness and elasticity of the dust-proof leather boots 29 can be used to prevent the guide wheels 27 from scratching the upper surface of the printed matter. At the same time, the dust-proof leather boots 29 can produce a certain elastic deformation under the elastic force of the spring rod 26, thereby increasing the contact area with the printed matter, thereby increasing the friction force and preventing the guide wheels 27 from slipping. After the detection equipment has been used for a long time, the dust-proof leather boots 29 can be removed separately for cleaning to ensure the cleanliness of the dust-proof leather boots 29.

[0024] like Figure 4As shown, the top of the detection frame 3 and the rear speed measuring frame 25 are fixedly installed with the same inkjet frame 30, and the top of the inkjet frame 30 is fixedly installed with a positioning ink barrel 31, and the bottom end of the positioning ink barrel 31 is fixedly installed with a micro pump 32, and the output end of the micro pump 32 is fixedly installed with an inkjet tube 33, and the position of the inkjet tube 33 corresponds to the position of the visual recognition instrument 4, and the bottom end of the inkjet tube 33 faces the detection platform 1; specifically, by setting the positioning ink barrel 31, when the visual recognition instrument 4 detects that the part of the current printed product being inspected has printing errors, problems or unqualified printing quality, the micro pump 32 will be started, so that the micro pump 32 draws ink from the positioning ink barrel 31, and prints it on the upper surface of the printed product through the inkjet tube 33, so that the dried ink marks the unqualified part of the printed product, thereby facilitating the subsequent staff or other equipment to remove the part.

[0025] like Figure 8 As shown, two positioning brackets 34 are fixedly installed on the top of the cleaning table 2, and the same positioning frame 35 is fixedly installed on the top of the two positioning brackets 34. The positioning frame 35 corresponds to the position of the rotating shaft 16, and the positioning frame 35 is adapted to the positioning plate 18; specifically, by setting the positioning frame 35, the transposition motor 21 drives the rotating shaft 16 to rotate. After the cleaning cotton cloth 20 is transposed, the lifting electric push rod 14 drives the rotating shaft 16 to descend, so that the positioning plate 18 located at the bottom gradually contacts the positioning frame 35. At this time, the transposition motor 21 will not self-lock. If the positioning plate 18 has a certain offset, the positioning plate 18 will drive the rotating shaft 16 to rotate under the pressure of the positioning frame 35 as the lifting electric push rod 14 is driven, until the positioning plate 18 and the positioning frame 35 are completely pressed flat, thereby ensuring that the lower surface of the cleaning cotton cloth 20 and the upper surface of the printed matter remain in a pressed state.

[0026] like Figure 2 As shown, a dustproof sleeve 36 is fixedly installed between the two lifting brackets 15, and the rotating shaft 16 is located inside the dustproof sleeve 36. The top and bottom of the dustproof sleeve 36 are provided with clearance holes, such as Figure 1As shown, the top of the testing table 1 and the cleaning table 2 is fixedly installed with the same outer light shielding cover 37, and a cloth changing door 38 corresponding to the position of the dustproof sleeve 36 is rotatably installed on one side of the outer light shielding cover 37. In the present embodiment, the front and rear side walls of the outer light shielding cover 37 are provided with through holes for paper products to pass through, and the inner light shielding cover 6 on the top of the testing table 1, the positioning ink barrel 31, and the dust suction cylinder 11 and the dustproof sleeve 36 on the top of the cleaning table 2 are all located inside the outer light shielding cover 37; specifically, by arranging the dustproof sleeve 36 and the outer light shielding cover 37, the dustproof sleeve 36 and the outer light shielding cover 37 can both play a role in dustproofing the interior, and the dustproof sleeve 36 only retains two upper and lower making way holes for replacing the cleaning cotton cloth 20 and for the cleaning cotton cloth 20 to contact with the printed matter, respectively. At the same time, the outer light shielding cover 37 can also be located at the outermost part to block the external ambient light, and cooperate with the internal inner light shielding cover 6 to prevent the ambient light from affecting the shooting and detection of the visual recognition device 4.

[0027] In summary: when the inspection device for inspecting printing quality is in use, the paper print slides on the top of the inspection table 1 and the cleaning table 2 driven by a conveying device such as a transmission roller, and the visual recognition device 4 located inside the inner light shielding cover 6 can visually scan and recognize the ink marks such as text and patterns printed on the surface of the bottom paper print under the light shielding protection of the inner light shielding cover 6 and the lighting effect of the lighting lamp 5 to ensure that there will be no printing errors such as misprinting and missing printing. At the same time, the photographed image is compared with a standard colorimetric card or a standard finished product to identify defective products with printing problems such as too light, too dark or uneven ink color. By setting an ink absorption component, the paper print will first pass through the bottom of the dust collection tube 11 before being sent into the inner light shielding cover 6 for visual identification. At this time, the vacuum cleaner 7 will draw the air inside the dust collection tube 11 through the three-way dust collection tube 8 and the hanging tube 9, so that negative pressure is formed inside the dust collection tube 11, so that the dust collection tube 11 generates a certain suction force on the upper surface of the paper print through the dust collection port 12 at the bottom, so that the dust, debris, etc. on the surface of the paper print are sucked away, thereby reducing the impact on subsequent shooting and detection, and at the same time, the pseudo-dry ink layer on the surface of the printed product is separated from the surface of the paper product under the suction of the vacuum cleaner 7, so that the ink layer that is easy to fall off is directly sucked away to avoid interference with the judgment result of subsequent shooting and detection. By setting up a cleaning component, when the printed product passes through the bottom of the rotating shaft 16, the upper surface of the printed product will contact the lower surface of the cleaning cotton cloth 20 located at the bottom, so that the cleaning cotton cloth 20 can touch the printed product. The upper surface of the cleaning cloth 20 is wiped, so that the ink layer that is pseudo-dry and not absorbed by the ink absorbing component is wiped off by the cleaning cotton cloth 20, so that the printed matter that originally has the phenomenon of pseudo-drying ink or the ink layer that is easy to fall off due to other factors can be exposed in advance before being sent for inspection, so that it can be identified in the subsequent shooting detection. By setting the lifting electric push rod 14, the lifting electric push rod 14 can control the cleaning cotton cloth 20 at the bottom to approach the printed matter, so that the cleaning cotton cloth 20 applies a certain pressure to the printed matter, thereby ensuring that the ink layer that is easy to fall off can be wiped off by the cleaning cotton cloth 20. At the same time, after the cleaning cotton cloth 20 has been used for a long time, the lifting electric push rod 14 controls the rotating shaft 16 to move upward as a whole, and the transposition motor 21 drives the rotating shaft 16 to rotate and transpose, so that the new cleaning cotton cloth 20 turns to the bottom. When the replaced cleaning cotton cloth 20 After the cleaning cotton cloth 20 finally moves to the top, the cleaning cotton cloth 20 can be torn off and replaced with a new cleaning cotton cloth 20, and then the lifting electric push rod 14 drives the rotating shaft 16 to reset, thereby ensuring that too much ink layer, ink shell and other debris will not accumulate on the lower surface of the cleaning cotton cloth 20. By providing a cleaning air duct 23, while the dust collection cylinder 11 vacuums the upper surface of the paper product through the dust collection port 12, the dust collection cylinder 11 will absorb the upper surface of the printed product located at the bottom of the rotating shaft 16 through the cleaning air duct 23 on the other side, so that the ink layer wiped off the surface of the printed product by the cleaning cotton cloth 20 and the ink layer accumulated on the cleaning cotton cloth 20 are absorbed, thereby keeping the printed product clean and extending the service life of the cleaning cotton cloth 20. By providing a guide wheel 27,After the printed matter is conveyed to the interior of the inner light shielding cover 6, the four corners of the printed matter located inside the inner light shielding cover 6 will all contact the guide wheels 27, and at the same time, the four spring rods 26 will respectively apply a certain pressure to the guide wheels 27, so that the printed matter is kept in a flat state inside the inner light shielding cover 6, thereby reducing the appearance of wrinkles on the printed matter and reducing the impact on the shooting detection of the visual recognition device 4. By setting up a torque sensor 28, when the printed matter is conveyed inside the inner light shielding cover 6, it will drive the four guide wheels 27 to rotate synchronously, thereby driving the sensing end of the torque sensor 28 to rotate, and then by real-time monitoring of the movement process of the four guide wheels 27, the transportation process of the printed matter inside the inner light shielding cover 6 is monitored, thereby ensuring that the printed matter is The single movement amount of the brushed product is within the standard range. By setting the dust cover leather 29, the dust cover leather 29 is tensioned and sleeved on the guide wheel 27, so that the dust cover leather 29 replaces the guide wheel 27 to contact the upper surface of the printed product. The softness and elasticity of the dust cover leather 29 can be used to prevent the guide wheel 27 from scratching the upper surface of the printed product. At the same time, the dust cover leather 29 produces a certain elastic deformation under the elastic force of the spring rod 26, increasing the contact area with the printed product, thereby increasing the friction and preventing the guide wheel 27 from slipping. After the detection equipment is used for a long time, the dust cover leather 29 is removed separately for cleaning to ensure the cleanliness of the dust cover leather 29. By setting the positioning ink barrel 31, when When the visual recognition instrument 4 detects that the part of the current printed product being inspected has printing errors, problems or unqualified printing quality, it will start the micro pump 32 to make the micro pump 32 extract ink from the positioning ink barrel 31, and print it on the upper surface of the printed product through the inkjet tube 33 to mark the unqualified part of the printed product, so as to facilitate the subsequent staff or other equipment to remove the part. By setting the positioning frame 35, the transposition motor 21 drives the rotating shaft 16 to rotate. After the cleaning cotton cloth 20 is transposed, the lifting electric push rod 14 drives the rotating shaft 16 to descend, so that the positioning plate 18 at the bottom gradually contacts the positioning frame 35. At this time, the transposition motor 21 will not self-lock. If the positioning plate 18 has a certain offset, the positioning plate 18 will be 18 will drive the rotating shaft 16 to rotate under the pressure of the positioning frame 35 as the lifting electric push rod 14 is driven, until the positioning plate 18 and the positioning frame 35 are completely pressed flat, thereby ensuring that the lower surface of the cleaning cotton cloth 20 and the upper surface of the printed matter are kept in a flat state. By setting the dust sleeve 36 and the outer light shielding cover 37, the dust sleeve 36 and the outer light shielding cover 37 can both play a dust-proof role inside. The dust sleeve 36 only retains two upper and lower clearance holes for replacing the cleaning cotton cloth 20 and for the cleaning cotton cloth 20 to contact the printed matter. At the same time, the outer light shielding cover 37 can also be located at the outermost part to block the external ambient light, and cooperate with the internal inner light shielding cover 6 to prevent the ambient light from affecting the shooting detection of the visual recognition device 4.

[0028] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A testing device for testing printing quality, characterized in that: The invention comprises a testing platform (1), a cleaning platform (2) is arranged on one side of the testing platform (1), a testing frame (3) is fixedly mounted on the top of the testing platform (1), a visual recognition instrument (4) facing the testing platform (1) is fixedly mounted on the top of the testing frame (3), two lighting lamps (5) are fixedly mounted on the top of the testing frame (3), the two lighting lamps (5) are both facing the testing platform (1) and are distributed on both sides of the visual recognition instrument (4), an inner light shielding cover (6) is fixedly mounted on the top of the testing frame (3), the testing frame (3), the visual recognition instrument (4) and the lighting lamps (5) are all located inside the inner light shielding cover (6), and an ink absorption component is arranged at the bottom of the cleaning platform (2); The ink absorbing component absorbs the dried ink on the surface of the paper print by using negative pressure to remove the ink layer that is easy to fall off. The ink absorbing component comprises a vacuum cleaner (7) fixedly mounted on one side of the bottom of the cleaning table (2). A three-way vacuum pipe (8) is fixedly mounted on the air inlet of the vacuum cleaner (7). Both top ends of the three-way vacuum pipe (8) extend to the top of the cleaning table (2) and are fixedly mounted with a hanging pipe (9). Two hanging brackets (10) are fixedly mounted on the top of the cleaning table (2). The two hanging pipes (9) are respectively fixedly mounted on the two hanging brackets (10). The same vacuum cylinder (11) is fixedly mounted between the two hanging brackets (10). A vacuum port (12) is provided at the bottom of the vacuum cylinder (11). A cleaning component for cleaning the ink layer on the paper print that is easy to fall off and has not been removed by the ink absorbing component is arranged on the top of the cleaning table (2), and the cleaning component comprises a cleaning bracket (13) fixedly mounted on the top of the cleaning table (2), the cleaning bracket (13) being located between the dust collection cylinder (11) and the inner light shielding cover (6), and two vertically arranged lifting electric push rods (14) are fixedly mounted on the top of the cleaning bracket (13), the telescopic ends of the lifting electric push rods (14) are both facing downwards and fixedly mounted with lifting brackets (15), and the two lifting brackets (15) are rotatably mounted with the same horizontally arranged rotating shaft (16), and a plurality of rotating shafts (16) are fixedly mounted on the circumference of the rotating shaft (16) along the rotating shaft. (16) a cotton cloth bracket (17) with an evenly distributed axis, a positioning plate (18) is fixedly installed on the side of the cotton cloth bracket (17) away from the rotating axis (16), a Velcro (19) is fixedly installed on the side of the positioning plate (18) away from the cotton cloth bracket (17), and a cleaning cotton cloth (20) is placed on the side of the Velcro (19) away from the positioning plate (18), a transposition motor (21) is fixedly installed on one side of one of the lifting brackets (15), the output shaft of the transposition motor (21) is drivingly connected to the rotating axis (16), and a lifting slide (22) is fixedly installed on one side of the transposition motor (21), and the lifting slide (22) is slidably installed on the cleaning bracket (13).

2. The detection device for detecting printing quality according to claim 1, characterized in that: A cleaning air duct (23) connected to the interior of the dust collection cylinder (11) is fixedly mounted on the side wall of the dust collection cylinder (11), and one end of the cleaning air duct (23) faces the rotating shaft (16).

3. The detection device for detecting printing quality according to claim 1, characterized in that: A front speed measuring frame (24) and a rear speed measuring frame (25) are fixedly mounted on the top of the detection platform (1); the front speed measuring frame (24) is located on a side of the detection frame (3) close to the cleaning bracket (13); the rear speed measuring frame (25) is located on a side of the detection frame (3) away from the cleaning bracket (13); vertically arranged spring rods (26) are fixedly mounted on both sides of the front speed measuring frame (24) and the rear speed measuring frame (25); and the telescopic ends of the spring rods (26) are both downwardly facing and rotatably mounted with horizontally arranged guide wheels (27).

4. The detection device for detecting printing quality according to claim 3, characterized in that: A torque sensor (28) is fixedly mounted on one side of the bottom end of the spring rod (26), and a sensing end of the torque sensor (28) located at the same location is connected to one end of the guide wheel (27).

5. The detection device for detecting printing quality according to claim 3, characterized in that: The guide wheels (27) are sleeved with dustproof covers (29).

6. The detection device for detecting printing quality according to claim 3, characterized in that: The top of the detection frame (3) and the rear speed measuring frame (25) are fixedly mounted with the same inkjet frame (30), the top of the inkjet frame (30) is fixedly mounted with a positioning ink barrel (31), the bottom end of the positioning ink barrel (31) is fixedly mounted with a micro pump (32), the output end of the micro pump (32) is fixedly mounted with an inkjet tube (33), the position of the inkjet tube (33) corresponds to the position of the visual recognition instrument (4), and the bottom end of the inkjet tube (33) faces the detection platform (1).

7. The detection device for detecting printing quality according to claim 1, characterized in that: Two positioning brackets (34) are fixedly mounted on the top of the cleaning table (2), and a same positioning frame (35) is fixedly mounted on the top of the two positioning brackets (34). The positioning frame (35) corresponds to the position of the rotating shaft (16), and the positioning frame (35) is adapted to the positioning plate (18).

8. The detection device for detecting printing quality according to claim 1, characterized in that: A same dustproof sleeve (36) is fixedly installed between the two lifting brackets (15), the rotating shaft (16) is located inside the dustproof sleeve (36), and the top and bottom of the dustproof sleeve (36) are provided with clearance holes. The tops of the inspection table (1) and the cleaning table (2) are fixedly installed with a same external light shielding cover (37), and one side of the external light shielding cover (37) is rotatably installed with a cloth changing door (38) corresponding to the position of the dustproof sleeve (36).

Images