Gravure color cell

Abstract

The invention relates to the technical field of gravure printing, in particular to a gravure color cell. The gravure machine comprises a rack, a traction roller set installed on the rack, a gravure assembly and a drying device, the gravure assembly comprises an ink fountain, a printing plate roller, a pressing roller and a doctor blade, the printing plate roller is detachably connected with the rack, and an ink fountain lifting mechanism capable of adjusting the height of the ink fountain is arranged between the ink fountain and the rack. A pressing roller lifting mechanism capable of adjusting the height of the pressing roller is arranged between the pressing roller and the rack, and a scraping knife lifting mechanism capable of adjusting the height of the scraping knife is arranged between the scraping knife and the rack. After the prior art is improved, scene requirements of different printing plate sizes can be met, the flexibility is high, the whole color set does not need to be replaced, and the production cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of gravure printing, in particular to a gravure color set. Background Art

[0002] Gravure printing technology, which originated in Europe in the 15th century, is an important printing process. Its characteristic is that the printing part is lower than the non-printing part, forming a depression. During the printing process, ink is filled into these depressed areas and then transferred to the substrate through pressure to form images and text. Gravure color sets, as the core component of gravure printing technology, directly determine the color performance and quality of printed products. Color sets usually include a variety of different colors of ink. By precisely controlling the amount and distribution of each ink, rich and accurate color effects can be presented on the substrate.

[0003] For example, a Chinese patent document with the authorization number CN217099307U discloses a dual-electronic axis multi-color group repeated registration high-speed positioning gravure printing machine, including a plurality of groups of gravure color group units arranged in series, which respectively repeat the registration and positioning gravure printing on the fed substrates, the gravure color group units include a traction roller group, an isolation traction roller, a gravure assembly, a cooling device and a curing device, and the substrates are fed by the gravure color group unit and then wound around the traction roller group, the isolation traction roller, the gravure assembly, the curing device and the cooling device in sequence, The components include an ink trough, a gravure plate roller, a gravure pressure roller and an ink scraping device, the gravure pressure roller, the gravure plate roller and the ink trough are arranged in sequence from top to bottom, the gravure pressure roller and the gravure plate roller are located above and below the substrate respectively, and an ink scraping device is provided on one side of the contact portion between the gravure pressure roller and the gravure plate roller and the substrate; however, the relative positions of the ink trough, the gravure pressure roller and the ink scraping device and the gravure plate roller are not adjustable. When it is necessary to replace the gravure plate roller of a different size, they cannot be adapted and the entire gravure color group unit needs to be replaced together, resulting in high costs.

[0004] Therefore, it is necessary to improve the deficiencies in the above prior art. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a gravure color group in view of the shortcomings of the above-mentioned prior art, so as to solve the problem that the relative positions of the ink tank, gravure pressure roller and ink scraping device and the gravure plate roller in the prior art cannot be adjusted, and when gravure plate rollers of different sizes need to be replaced, they cannot be adapted and the entire gravure color group unit needs to be replaced together, resulting in high costs.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a gravure color group, comprising a frame, a traction roller group installed on the frame, a gravure printing component and a drying device, the gravure printing component comprising an ink fountain, a plate roller, a pressure roller and a scraper, the plate roller is detachably connected to the frame, an ink fountain lifting mechanism capable of adjusting the height of the ink fountain is provided between the ink fountain and the frame, a pressure roller lifting mechanism capable of adjusting the height of the pressure roller is provided between the pressure roller and the frame, and a scraper lifting mechanism capable of adjusting the height of the scraper is provided between the scraper and the frame.

[0007] By adopting the above technical solution, when replacing plate rollers of different sizes, the ink fountain, pressure roller and scraper are adjusted to be away from the plate roller through the ink fountain lifting mechanism, pressure roller lifting mechanism and scraper lifting mechanism respectively, so as to facilitate the removal of the plate roller from the frame. After replacing the new plate roller, the height of the ink fountain, pressure roller and scraper is readjusted to adapt to the size of the current new plate roller; therefore, it can adapt to the scene requirements of different plate sizes, with high flexibility, without the need to replace the entire color group, thereby reducing production costs.

[0008] The above technical scheme is further configured as follows: one end of the rotating shaft of the printing plate roller is circumferentially fixed and axially movable in rotation with the frame, and the other end is rotatably connected to a support plate, a limiting flange is installed on the side of the support plate away from the printing plate roller, the middle and lower parts of the side of the frame are respectively provided with a positioning short shaft and a positioning long shaft extending outward, the side of the support plate is provided with a first positioning hole and a second positioning hole which respectively transitionally cooperate with the positioning short shaft and the positioning long shaft, the end of the positioning long shaft is detachably connected with an axis end retaining ring, the outer sleeve of the positioning short shaft is provided with a positioning locking block fixedly mounted on the support plate, the positioning locking block is rotatably connected with an eccentric locking shaft, the eccentric locking shaft is connected with a locking handle, the eccentric locking shaft and the positioning short shaft are both provided with eccentric planes for eccentric cooperation, and the eccentric plane of the positioning short shaft is provided with an arc groove which cooperates with the arc surface of the eccentric locking shaft.

[0009] By adopting the above technical scheme, when disassembling the plate roller, the locking handle is pulled to drive the eccentric lock shaft to rotate so that the eccentric lock shaft and the eccentric planes on the positioning short shaft are opposite to each other, and the arc surface of the eccentric lock shaft disengages from the arc groove of the positioning short shaft, and the eccentric lock shaft no longer limits and locks the positioning short shaft. Then, the support plate can be pulled outward in the axial direction of the positioning short shaft and the positioning long shaft and drive the limiting flange to release the axial end limit of the plate roller, until the positioning short shaft disengages from the first positioning hole, the support plate can be rotated to completely unlock, and then the plate roller can be moved axially to be removed from the frame, and a new plate roller can be replaced by the reverse operation, thereby realizing the disassembly, assembly and replacement of the plate roller.

[0010] The above technical solution is further configured as follows: the ink fountain lifting mechanism includes a bracket fixedly installed on the bottom of the ink fountain, racks fixedly installed at both ends of the bottom of the bracket, a first rotating shaft rotatably connected to the frame below the bracket, and a first driving motor transmission-connected to the first rotating shaft, the two ends of the bracket are vertically slidably connected to the frame, and the first rotating shaft is provided with a first gear transmission-connected to the rack.

[0011] By adopting the above technical solution, when adjusting the height of the ink fountain, the first drive motor is started to rotate the first rotating shaft, which in turn drives the first gear to rotate. The rotation of the first gear drives the rack to move up and down through the gear transmission. The rack drives the bracket and the ink fountain to slide up and down along the frame, thereby realizing the height lifting and lowering adjustment of the ink fountain to adapt to printing plate rollers of different sizes.

[0012] The above technical solution is further configured as follows: an ink uniforming roller installed on the ink fountain is provided on the side of the printing plate roller away from the ink scraper, the ink uniforming roller is located above the ink in the ink fountain and the ink uniforming roller can abut against the printing plate roller, and an oil spraying device is provided next to the ink fountain, one end of the oil spraying device is connected to the ink nozzle located above the ink uniforming roller, and the other end is connected to the lower end of the ink fountain. Horizontal guide rails are provided on the inner side surfaces of both ends of the ink fountain. Rollers are installed on both ends of the ink uniforming roller, and a movable push plate is provided on the side of the ink uniforming roller away from the printing plate roller, and protrusions are provided at both ends of the movable push plate that can abut against the circumferential surface of the roller. The ink nozzle is fixedly mounted on the upper end of the movable push plate, and a first adjusting block is provided on the side of the ink fountain, the movable push plate is connected to an adjusting screw, the adjusting screw and the first adjusting block are threadedly connected, the adjusting screw passes through the first adjusting block, one end is rotatably fixedly connected to the movable push plate in an axial direction, and the other end is provided with a first adjusting knob.

[0013] By adopting the above technical scheme, during the printing process, the oil injection device absorbs the ink in the ink fountain and sprays the ink onto the printing plate roller and the ink distribution roller through the ink nozzle and flows into the groove formed by the fit between them. The rotation of the printing plate roller drives the ink distribution roller to rotate relative to each other so that the ink can be evenly distributed on the printing plate roller, and the excess ink will fall back into the ink fountain for recycling; therefore, the design of the ink distribution roller enables the ink to be more evenly distributed on the printing plate roller, and by combining with the inkjet method, the amount of ink can be accurately controlled, which can not only improve the printing quality, but also reduce the waste of ink and reduce the cost; after replacing printing plate rollers of different sizes, the movable push plate is adjusted to approach or move away from the printing plate roller in the direction of the guide rail by turning the first adjustment knob. In the process of approaching the printing plate roller, the convex block on the movable push plate abuts against the roller and pushes the roller to drive the ink distribution roller to approach and abut against the printing plate roller, and adjusting it away from the printing plate roller releases the abutment limit of the roller of the ink distribution roller; therefore, the pressure between the ink distribution roller and the printing plate roller can be adjusted as needed.

[0014] The above technical solution is further configured as follows: the pressure roller lifting mechanism includes a pressure roller frame on both sides of which are respectively connected to the frame for upward and downward sliding movement, a first screw nut installed on both side surfaces of the pressure roller frame, a vertically guided first screw threadedly connected to the first screw nut, a second rotating shaft arranged above the first screw, and a second driving motor connected to the second rotating shaft in transmission, a first bevel gear is provided at the upper end of the first screw, a second bevel gear connected to the first bevel gear is provided on the second rotating shaft, a fixed block is rotatably connected to one end of the first screw near the first bevel gear, the second rotating shaft, the second driving motor and the fixed block are all installed on the frame, and the pressure roller is installed at the lower end of the pressure roller frame.

[0015] By adopting the above technical solution, the output end of the second drive motor drives the second rotating shaft to rotate, the second bevel gear on the second rotating shaft drives the first bevel gear and drives the first screw to rotate, and the rotation of the first screw screw drives the first screw nut to drive the pressure roller frame to move up and down as a whole, so that the height of the pressure roller can be adjusted to adapt to printing plate rollers of different sizes.

[0016] The above technical solution is further configured as follows: sliding members are installed at both ends of the pressure roller, the sliding members are slidably connected to the side of the pressure roller frame up and down, the sliding member is connected to the first cylinder, tensioning rollers are respectively provided on both sides above the pressure roller, and tensioning swing rods are respectively connected at both ends of the tensioning roller, the tensioning swing rod is rotatably connected to the tensioning connecting rod at one end away from the tensioning roller, the middle part of the tensioning swing rod is rotatably connected to the side of the pressure roller frame, the end of the tensioning connecting rod away from the tensioning swing rod is rotatably connected to the sliding member, and the pressure roller frame is located above the tensioning roller and has two guide rollers installed, and the horizontal distance between the guide roller and the pressure roller is greater than the horizontal distance between the tensioning roller and the pressure roller that are close to each other.

[0017] By adopting the above technical scheme, when it is necessary to raise the pressure roller to pass the printing substrate, the driving member is started to drive the sliding member to move upward along the pressure roller frame and synchronously drive the pressure roller to move upward, and at the same time, the tensioning connecting rod is linked to push the tensioning swing rod upward, and the lever is used to move away. The tensioning swing rod rotates relative to the pressure roller frame and its other end moves downward, and at the same time drives the two ends of the tensioning roller to move downward, that is, the tensioning roller is synchronously lowered. Therefore, when the pressure roller rises and does not press the printing substrate, the tensioning roller compensates by pressing downward, so that the printing substrate can still be in a tensioned state; similarly, when the pressure roller descends, the tensioning roller rises; therefore, the printing substrate can always be in a tensioned state during the lifting and lowering process of the pressure roller, so that it is not easy to be misaligned and the printing effect is not affected.

[0018] The above technical solution is further configured as follows: the scraper lifting mechanism includes a fixed bracket installed on the frame and a first movable bracket installed on the fixed bracket, a second screw nut is installed in the middle of the first movable bracket, the second screw nut is threadedly connected to the second screw, both ends of the second screw are respectively rotatably connected to the top and bottom of the fixed bracket, a second gear is provided at one end of the second screw, and the second gear is transmission-connected to a third drive motor, the fixed bracket is provided with guide rods on both sides of the second screw, the guide rods are slidably connected to the first movable bracket, and the scraper is installed on the first movable bracket.

[0019] By adopting the above technical solution, the third drive motor drives the second gear to drive the screw to rotate. The screw and the screw nut are spirally transmitted to make the screw nut rise and fall along the screw and drive the first movable bracket to rise and fall. The first movable bracket drives the scraper to rise and fall, so that the height of the scraper can be adjusted to adapt to printing plate rollers of different sizes.

[0020] The above technical scheme is further configured as follows: the first movable bracket is horizontally slidably connected to the second movable bracket, the scraper is installed on the second movable bracket, the first movable bracket is installed with a fourth driving motor, the output shaft of the fourth driving motor is eccentrically connected to a connecting piece, a vertical strip hole is provided on the side of the second movable bracket, one end of the connecting piece extends into the strip hole and a bearing is sleeved on its outer periphery, both sides of the bearing can abut against the inner walls of both sides of the strip hole, a scraper rotating shaft is provided at one end of the second movable bracket close to the scraper, scraper swing arms rotatably connected thereto are provided at both ends of the scraper rotating shaft, the scraper is installed between the two scraper swing arms, the scraper swing arm end away from the scraper is rotatably connected to a second cylinder, the end of the second cylinder away from the scraper swing arm is rotatably connected to the side of the second movable bracket, and the second movable bracket is provided with a limit block that can abut against it above the connecting end of the scraper swing arm and the second cylinder.

[0021] By adopting the above technical scheme, after the fourth drive motor is started, its output shaft drives the connecting member to rotate. Since the connecting member is eccentrically installed on the output shaft of the fourth drive motor, when the connecting member rotates, it drives the bearing to act on the inner wall of the strip hole and drives the second movable bracket to slide horizontally relative to the fixed bracket, and the bearing slides vertically on the inner wall of the strip hole. Every time the connecting member rotates one circle, the second movable bracket undergoes a horizontal reciprocating motion. Therefore, it can continuously and reciprocatingly drive the scraper to continuously change its position in the axial direction of the printing plate roller or the anilox roller of the printing press, so that the blade of the scraper is evenly worn, and the continuous wear of a certain part of the blade of the scraper to avoid the formation of a gap, thereby improving the service life of the scraper; when only the scraper needs to be replaced and maintained, the scraper end of the scraper swing arm can be driven to rotate and lift upward by controlling the contraction of the movable end of the second cylinder, so that the scraper is away from the printing plate roller or the anilox roller of the printing press, thereby facilitating the disassembly and assembly of the scraper; after replacement and maintenance, the movable end of the second cylinder is controlled to extend to reset the scraper.

[0022] The above technical solution is further configured as follows: a scraper holder is provided between the two scraper swing arms, and internal threaded holes and limit pins are provided on the side surfaces of both ends of the scraper holder, and screw countersunk holes corresponding to the positions of the internal threaded holes and limit grooves cooperating with the limit pins are respectively provided on the sides of the scraper swing arms, and the internal threaded holes are threadedly connected with a first adjusting screw, and second adjusting blocks are fixedly installed at both ends of the scraper, and a screw rod portion is provided at one end of the second adjusting block away from the scraper, and the screw rod portion is threadedly connected with a locking nut, and a locking retaining ring is detachably connected to the end of the screw portion, and adjustment grooves are provided at both ends of the scraper holder, and a U-shaped adjustment seat is fitted in the adjustment groove, and a U-shaped locking hole for the screw rod portion to pass through is provided at the bottom of the adjustment groove, and the locking nut can be engaged with the locking hole of the scraper holder at two ends. The sides are abutted against each other, an adjusting threaded hole is provided at the bottom of the adjusting seat, and the adjusting threaded hole is threadedly connected with a second adjusting screw, the second adjusting screw passes through the second adjusting block and one end of its nut can abut against the second adjusting block, the second adjusting screw is located between the second adjusting block and the adjusting seat and is sleeved with an adjusting spring, the scraper frame is provided with an avoidance hole corresponding to the position of the second adjusting screw, a second adjusting knob is provided on one side of the adjusting seat, the second adjusting knob is threadedly connected with a fastening screw, the scraper frame is provided with a fastening through hole, the fastening screw is sleeved with an anti-loosening spring at one end which abuts against the nut of the fastening screw and the other end which abuts against the inner wall of the fastening through hole, the second adjusting knob is eccentrically connected to the fastening screw and rotating the second adjusting knob can make its protruding part abut against or separate from the top of the adjusting seat.

[0023] By adopting the above technical solution, when it is necessary to adjust the angle of the ink scraper, the scraper frame can be adjusted to drive the ink scraper to rotate to a suitable angle after loosening the first adjusting screw, and then the first adjusting screw can be tightened to re-tighten the scraper frame and the scraper swing arm; the rotation angle of the scraper frame can be limited to a suitable range by cooperating with the limit pin on the side of the scraper frame and the limit groove on the side of the scraper swing arm; when it is necessary to adjust the distance between one end of the ink scraper and the printing plate roller or anilox roller of the printing press, the locking nut is loosened to release the fastening lock between the second adjustment block and the scraper frame, and then the second adjusting screw and the adjustment seat spiral are turned. The transmission changes the distance between the second adjusting block and the adjusting seat, and the adjusting spring can make the second adjusting block always abut against the second adjusting screw. The second adjusting block drives the scraper to move closer to or away from the plate roller or the anilox roller of the printing press. After adjusting the scraper to a good position, retighten the locking nut to lock the second adjusting block and the scraper holder. When the scraper needs to be removed, turn the second adjusting knob so that its protruding part moves away from the top of the adjusting seat and no longer limits the adjusting seat. Then loosen the locking nut, the scraper can be removed from the scraper holder together with the second adjusting block and the adjusting seat. The reverse operation can be performed during installation.

[0024] The above technical solution is further configured as follows: the traction roller group includes a traction mechanism for traction substrate feeding, a color registration mechanism for color registration adjustment before printing, and a correction mechanism for correcting the substrate after printing, the color registration mechanism includes a fifth drive motor installed on the frame, a third rotating shaft connected to the fifth drive motor in a transmission manner, and a color registration roller, both ends of the third rotating shaft are connected to a third screw rod through a bevel gear transmission, the third screw rod is rotatably installed on the frame, the third screw rod is spirally connected to a third screw rod nut, one side of the third screw rod nut is connected to the end of the color registration roller, and the other side is slidably connected to the frame, the correction mechanism includes a correction roller, a mounting seat installed on the frame, and a correction adjustment screw threadedly connected to the end of the correction roller, a strip-shaped adjustment hole is provided on the side of the mounting seat close to the correction roller, one end of the correction adjustment screw passes through the mounting seat and is connected to the adjustment hole, and the other end is connected to an adjustment handle, and the outer sleeve of the correction adjustment screw is provided with a stabilizing spring with one end abutting against the end of the correction roller and the other end abutting against the inner wall of the mounting seat at the adjustment hole.

[0025] By adopting the above technical scheme, when the color registration operation of the color group is performed, the third shaft is driven to rotate by the fifth driving motor, and the third shaft is rotated by the third screw at both ends of the bevel gear transmission respectively, and the spiral transmission of the third screw can drive the third screw nut to rise and fall, and then drive the lifting and lowering of the color registration roller, so as to adjust the relative position of the pattern on the substrate and the printing plate roller to realize the color registration function; when the position of the substrate is offset after printing, the adjustment handles at both ends of the correction roller can be turned to drive the correction screw to rotate, and the spiral transmission of the correction screw drives the correction roller to move along the correction screw, and the offset at both ends of the correction roller is used to correct and compensate for the offset of the substrate, thereby achieving the correction effect.

[0026] The beneficial effects achieved by the present invention are: it can adapt to scene requirements of different printing plate sizes, has high flexibility, does not need to replace the entire color group, and reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural diagram of an embodiment of the present invention;

[0028] Figure 2 is a cross-sectional view of an embodiment of the present invention;

[0029] Figure 3 is an exploded view of a detachable structure of a printing plate roller in an embodiment of the present invention;

[0030] Figure 4 2 is a schematic diagram of a structure related to ink supply at an ink fountain in an embodiment of the present invention;

[0031] Figure 5 2 is a schematic diagram of the structure of the ink fountain lifting mechanism in an embodiment of the present invention;

[0032] Figure 6 Schematic diagram of the structure of the ink distribution roller adjustment in an embodiment of the present invention;

[0033] Figure 7 yes Figure 6 Partial view at A in the middle;

[0034] Figure 8 2 is a schematic structural diagram of a pressure roller lifting mechanism in an embodiment of the present invention;

[0035] Fig. 9 is a schematic diagram of a tensioning structure at a pressure roller in an embodiment of the present invention;

[0036] Fig.10 yes Fig. 9 Partial view at B in the middle;

[0037] Fig.11 The structure diagram of the scraper lifting mechanism in the embodiment of the present invention is shown in FIG. Figure 1 ;

[0038] Fig.12 The structure diagram of the scraper lifting mechanism in the embodiment of the present invention is shown in FIG. Figure 2 ;

[0039] Fig.13 Schematic diagram of the structure of the horizontal movement of the ink scraper in the embodiment of the present invention;

[0040] Fig.14 : is an exploded diagram of the relevant structure of the angle and distance adjustment of the ink scraper in an embodiment of the present invention;

[0041] Fig.15 yes Fig.14 Partial view at center C;

[0042] Fig.16 It is a structural schematic diagram of the color registering mechanism in an embodiment of the present invention;

[0043] Fig.17 Schematic diagram of the structure of the deviation correction mechanism in the embodiment of the present invention. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] like Figure 1 , 2 As shown in the figure, a gravure color group includes a frame 1, a traction roller group 2 installed on the frame 1, a gravure printing component 3 and a drying device 4, the gravure printing component 3 includes an ink fountain 31, a plate roller 32, a pressure roller 33 and a scraper 34, the plate roller 32 is detachably connected to the frame 1, an ink fountain lifting mechanism capable of adjusting the height of the ink fountain 31 is provided between the ink fountain 31 and the frame 1, a pressure roller lifting mechanism capable of adjusting the height of the pressure roller 33 is provided between the pressure roller 33 and the frame 1, and a scraper lifting mechanism capable of adjusting the height of the scraper 34 is provided between the scraper 34 and the frame 1; the drying device 4 is used to dry and solidify the ink on the substrate after printing, and preferably an oven is used for drying.

[0046] like Figure 1 , 3As shown in the figure, one end of the rotating shaft of the printing plate roller 32 is rotatably connected to the frame 1 in a circumferentially fixed and axially movable manner, and the other end is rotatably connected to a support plate 321. A limiting flange 322 is installed on the side of the support plate 321 away from the printing plate roller 32. A positioning short shaft 323 and a positioning long shaft 324 extending outward are provided in the middle and lower parts of the side of the frame 1 in sequence. A first positioning hole 3211 and a second positioning hole 3212 are provided on the side of the support plate 321 to transitionally match the positioning short shaft 323 and the positioning long shaft 324, respectively. The end of the positioning long shaft 324 is detachably connected with an axis end retaining ring 325, and the outer sleeve of the positioning short shaft 323 is provided with a positioning locking block 326 fixedly mounted on the support plate 321, the positioning locking block 326 is rotatably connected with an eccentric locking shaft 327, and the eccentric locking shaft 327 is connected with a locking handle 328, and the eccentric locking shaft 327 and the positioning short shaft 323 are both provided with an eccentric plane 329 for eccentric matching, and the eccentric plane 329 of the positioning short shaft 323 is provided with an arc-shaped groove 3290 that matches the arc surface of the eccentric locking shaft 327.

[0047] like Figure 4-7 As shown in the figure, the ink fountain lifting mechanism includes a bracket 310 fixedly installed at the bottom of the ink fountain 31, racks 311 fixedly installed at both ends of the bottom of the bracket 310, a first shaft 312 rotatably connected to the frame 1 below the bracket 310, and a first drive motor 313 connected to the first shaft 312 in a transmission connection. The two ends of the bracket 310 are vertically slidably connected to the frame 1 through linear guide rails. The first shaft 312 is provided with a first gear 314 connected to the rack 311 in a transmission connection. The printing plate roller 32 is away from the ink scraper. One side of the knife 34 is provided with an ink-distributing roller 35 installed on the ink fountain 31. The ink-distributing roller 35 is located above the ink in the ink fountain 31 and can abut against the printing plate roller 32. An oil spraying device 36 is provided next to the ink fountain 31. One end of the oil spraying device 36 is connected to an ink nozzle 361 located above the ink-distributing roller 35, and the other end is connected to the lower end of the ink fountain 31. The oil spraying device 36 can adopt an ink pump that can automatically control the flow rate. The ink in the ink fountain 31 is extracted by the ink pump and then sprayed out by the ink nozzle 361. Horizontal guide rails 315 are provided on the inner side surfaces of both ends of the ink fountain 31, and rollers 351 are installed at both ends of the ink distributing roller 35. The ink distributing roller 35 can slide back and forth on the guide rails 315 through the rollers 351. A movable push plate 352 is provided on the side of the ink distributing roller 35 away from the printing plate roller 32, and protrusions 353 that can abut against the circumference of the roller 351 are provided at both ends of the movable push plate 352. The ink nozzle 361 is fixedly installed on the upper end of the movable push plate 352. A first adjusting block 316 is provided on the side of the ink fountain 31, and the movable push plate 352 is connected to an adjusting screw 354. The adjusting screw 354 and the first adjusting block 316 are threadedly connected. The adjusting screw 354 passes through the first adjusting block 316 and is rotatably fixedly connected to the movable push plate 352 at one end, and a first adjusting knob 355 is provided at the other end.

[0048] like Figure 8-10 As shown in, the pressure roller lifting mechanism includes a pressure roller frame 330 that is slidably connected to the frame 1 up and down on both sides, a first screw nut 331 installed on both side surfaces of the pressure roller frame 330, a vertically guided first screw 332 threadedly connected to the first screw nut 331, a second rotating shaft 333 arranged above the first screw 332, and a second driving motor 334 drivingly connected to the second rotating shaft 333. A first bevel gear 3321 is provided at the upper end of the first screw 332, and a second bevel gear 3331 drivingly connected to the first bevel gear 3321 is provided on the second rotating shaft 333. A fixed block 335 is rotatably connected to one end of the first screw 332 close to the first bevel gear 3321. The second rotating shaft 333, the second driving motor 334 and the fixed block 335 are all installed on the frame 1, and the pressure roller 33 is installed on the pressure roller frame 330. The lower end of the pressure roller 33 is provided with sliding members 336 at both ends of the pressure roller 33, and the sliding members 336 are connected to the side of the pressure roller frame 330 by sliding up and down through a linear guide rail. The sliding member 336 is connected to the first cylinder 337, and tensioning rollers 338 are respectively provided on both sides above the pressure roller 33, and tensioning swing rods 3381 are respectively connected at both ends of the tensioning roller 338, and the tensioning swing rod 3381 is rotatably connected to the tensioning connecting rod 3382 at one end away from the tensioning roller 338, and the middle part of the tensioning swing rod 3381 is rotatably connected to the side of the pressure roller frame 330, and the end of the tensioning connecting rod 3382 away from the tensioning swing rod 3381 is rotatably connected to the sliding member 336, and the pressure roller frame 330 is located above the tensioning roller 338 and is provided with two guide rollers 339, and the horizontal distance between the guide roller 339 and the pressure roller 33 is greater than the horizontal distance between the tensioning roller 338 and the pressure roller 33.

[0049] like Fig.11 As shown in, the scraper lifting mechanism includes a fixed bracket 340 installed on the frame 1 and a first movable bracket 341 installed on the fixed bracket 340, a second screw nut 342 is installed in the middle of the first movable bracket 341, the second screw nut 342 is threadedly connected to the second screw 343, the two ends of the second screw 343 are respectively rotatably connected to the top and bottom of the fixed bracket 340, a second gear 3431 is provided at one end of the second screw 343, and the second gear 3431 is connected to the third drive motor 344 through a synchronous belt drive, the fixed bracket 340 is provided with guide rods 3401 on both sides of the second screw 343, the guide rods 3401 are slidably connected to the first movable bracket 341, and the ink scraper 34 is installed on the first movable bracket 341.

[0050] like Fig.12 , 13As shown in the figure, the first movable bracket 341 is horizontally slidably connected to the second movable bracket 345, the scraper 34 is installed on the second movable bracket 345, the first movable bracket 341 is installed with the fourth drive motor 346, the output shaft of the fourth drive motor 346 is eccentrically connected to the connecting piece 3461, and a vertical strip hole 3450 is provided on the side of the second movable bracket 345, one end of the connecting piece 3461 extends into the strip hole 3450 and a bearing 3462 is mounted on its outer periphery, and the two sides of the bearing 3462 can abut against the inner walls of the two sides of the strip hole 3450.

[0051] like Fig.12 As shown in the figure, the second movable bracket 345 is provided with a scraper shaft 3451 at one end close to the scraper 34, and scraper swing arms 3452 rotatably connected thereto are provided at both ends of the scraper shaft 3451. The scraper 34 is installed between the two scraper swing arms 3452, and the end of the scraper swing arm 3452 away from the scraper 34 is rotatably connected to the second cylinder 3453, and the end of the second cylinder 3453 away from the scraper swing arm 3452 is rotatably connected to the side of the second movable bracket 345, and the second movable bracket 345 is located above the connecting end of the scraper swing arm 3452 and the second cylinder 3453 and is provided with a limit block 3454 that can abut against it.

[0052] like Fig.14 , 15As shown in the figure, a scraper frame 347 is provided between the two scraper swing arms 3452, and internal threaded holes 3470 and limiting pins 3471 are provided on the side surfaces of both ends of the scraper frame 347. Screw countersunk holes 3455 corresponding to the positions of the internal threaded holes 3470 and limiting grooves 3456 cooperating with the limiting pins 3471 are provided on the side surfaces of the scraper swing arms 3452, and the internal threaded holes 3470 are threadedly connected with first adjusting screws 3472. Second adjusting blocks 348 are fixedly installed at both ends of the ink scraper 34, and the second adjusting blocks 348 are away from The ink scraper 34 is provided with a screw portion 3481 at one end, and a locking nut 3482 is threadedly connected to the screw portion 3481. The end of the screw portion 3481 is detachably connected to a locking retaining ring 3483. Adjustment grooves 3473 are provided at both ends of the scraper holder 347. A U-shaped adjustment seat 349 is fitted in the adjustment groove 3473. A U-shaped locking hole 3474 is provided at the bottom of the adjustment groove 3473 for the screw portion 3481 to pass through. The locking nut 3482 can be engaged with both sides of the locking hole 3474 of the scraper holder 347. The bottom of the adjustment seat 349 is provided with an adjustment threaded hole 3490, and the adjustment threaded hole 3490 is threadedly connected with a second adjustment screw 3491, the second adjustment screw 3491 passes through the second adjustment block 348 and one end of the nut can abut against the second adjustment block 348, the second adjustment screw 3491 is located between the second adjustment block 348 and the adjustment seat 349 and is sleeved with an adjustment spring 3492, the scraper frame 347 is provided with an avoidance hole 3475 corresponding to the position of the second adjustment screw 3491, and the adjustment seat 349 is provided with a There is a second adjusting knob 3493, which is threadedly connected to a fastening screw 3494. A fastening through hole 3476 is provided on the scraper frame 347. An anti-loosening spring 3495 is provided on the outer periphery of the fastening screw 3494, one end of which abuts against the nut of the fastening screw 3494 and the other end abuts against the inner wall of the fastening through hole 3476. The second adjusting knob 3493 is eccentrically connected to the fastening screw 3494 and rotating the second adjusting knob 3493 can make its protruding part abut against or separate from the top of the adjusting seat 349.

[0053] like Figure 1 , 16As shown in , 17, the traction roller group 2 includes a traction mechanism 21 for traction substrate feeding, a color registration mechanism 22 for color registration adjustment before printing, and a correction mechanism 23 for correcting the substrate after printing. The color registration mechanism 22 includes a fifth drive motor 221 installed on the frame 1, a third shaft 222 connected to the fifth drive motor 221 through a synchronous belt (not shown in the figure) and a color registration roller 223. The two ends of the third shaft 222 are connected to a third screw rod 224 through a bevel gear transmission. The third screw rod 224 is rotatably installed on the frame 1. The third screw rod 224 is spirally connected to a third screw rod nut 225. One side of the third screw rod nut 225 It is connected to the end of the color roller 223 and is slidably connected to the frame 1 on the other side. The correcting mechanism 23 includes a correcting roller 231, a mounting seat 232 installed on the frame 1, and a correcting adjustment screw 233 threadedly connected to the end of the correcting roller 231. A strip-shaped adjustment hole 2310 is provided on the side of the mounting seat 232 close to the correcting roller 231. One end of the correcting adjustment screw 233 passes through the mounting seat 232 and is connected to the adjustment hole 2310, and the other end is connected to an adjustment handle 234. The outer sleeve of the correcting adjustment screw 233 is provided with a stabilizing spring 235, one end of which abuts against the end of the correcting roller 231 and the other end abuts against the inner wall of the mounting seat 232 at the adjustment hole 2310.

[0054] In the above embodiment, when replacing a printing plate roller 32 of a different size, the ink fountain 31, the pressure roller 33 and the scraper 34 are adjusted to be away from the printing plate roller 32 through the ink fountain lifting mechanism, the pressure roller lifting mechanism and the scraper lifting mechanism respectively, so as to facilitate the removal of the printing plate roller 32 from the frame 1. After replacing the new printing plate roller 32, the heights of the ink fountain 31, the pressure roller 33 and the scraper 34 are readjusted to adapt to the size of the current new printing plate roller 32; therefore, it can adapt to the scene requirements of different printing plate sizes, with high flexibility, without the need to replace the entire color group, thereby reducing production costs.

Claims

1. A gravure printing color group, comprising a frame, a traction roller group installed on the frame, a gravure printing component and a drying device, wherein the gravure printing component comprises an ink fountain, a plate roller, a pressure roller and an ink scraper, characterized in that: The plate roller is detachably connected to the frame, an ink fountain lifting mechanism capable of adjusting the height of the ink fountain is provided between the ink fountain and the frame, a pressure roller lifting mechanism capable of adjusting the height of the pressure roller is provided between the pressure roller and the frame, and a scraper lifting mechanism capable of adjusting the height of the scraper is provided between the scraper and the frame.

2. A gravure color set according to claim 1, characterized in that: One end of the rotating shaft of the printing plate roller is circumferentially fixed and axially movable in rotation with the frame, and the other end is rotatably connected to a support plate, and a limiting flange is installed on the side of the support plate away from the printing plate roller, and the middle and lower parts of the side of the frame are respectively provided with a positioning short shaft and a positioning long shaft extending outward, and the side of the support plate is provided with a first positioning hole and a second positioning hole which respectively transitionally cooperate with the positioning short shaft and the positioning long shaft, and the end of the positioning long shaft is detachably connected with an axis end retaining ring, and the outer sleeve of the positioning short shaft is provided with a positioning locking block fixedly mounted on the support plate, the positioning locking block is rotatably connected with an eccentric locking shaft, and the eccentric locking shaft is connected with a locking handle, and the eccentric locking shaft and the positioning short shaft are both provided with eccentric planes for eccentric cooperation, and the eccentric plane of the positioning short shaft is provided with an arc groove which cooperates with the arc surface of the eccentric locking shaft.

3. A gravure color set according to claim 2, characterized in that: The ink fountain lifting mechanism includes a bracket fixedly installed at the bottom of the ink fountain, racks fixedly installed at both ends of the bottom of the bracket, a first rotating shaft rotatably connected to the frame below the bracket, and a first driving motor transmission-connected to the first rotating shaft. The two ends of the bracket are vertically slidably connected to the frame, and the first rotating shaft is provided with a first gear transmission-connected to the rack.

4. A gravure color set according to claim 3, characterized in that: The ink roller is provided with an ink uniforming roller installed on the ink fountain on the side of the printing plate roller away from the ink scraper. The ink uniforming roller is located above the ink in the ink fountain and the ink uniforming roller can abut against the printing plate roller. An oil spraying device is provided next to the ink fountain, one end of the oil spraying device is connected to the ink nozzle located above the ink uniforming roller, and the other end is connected to the lower end of the ink fountain. Horizontal guide rails are provided on the inner side surfaces of both ends of the ink fountain, and rollers are installed at both ends of the ink uniforming roller, and a movable push plate is provided on the side of the ink uniforming roller away from the printing plate roller, and protrusions are provided at both ends of the movable push plate that can abut against the circumferential surface of the roller. The ink nozzle is fixedly mounted on the upper end of the movable push plate, and a first adjusting block is provided on the side of the ink fountain, and the movable push plate is connected with an adjusting screw, and the adjusting screw and the first adjusting block are threadedly connected, and the adjusting screw passes through the first adjusting block. One end is axially fixedly connected to the movable push plate for rotation, and the other end is provided with a first adjusting knob.

5. A gravure color set according to any one of claims 1 to 4, characterized in that: The roller lifting mechanism includes a roller frame that is slidably connected to the frame up and down on both sides, a first screw nut installed on both side surfaces of the roller frame, a vertically guided first screw threadedly connected to the first screw nut, a second rotating shaft arranged above the first screw, and a second driving motor drivingly connected to the second rotating shaft, a first bevel gear is provided at the upper end of the first screw, a second bevel gear drivingly connected to the first bevel gear is provided on the second rotating shaft, a fixed block is rotatably connected to one end of the first screw near the first bevel gear, the second rotating shaft, the second driving motor and the fixed block are all installed on the frame, and the roller is installed at the lower end of the roller frame.

6. A gravure color set according to claim 5, characterized in that: Sliding members are installed at both ends of the pressure roller, and the sliding members are slidably connected to the side of the pressure roller frame up and down, the sliding member is connected to the first cylinder, tensioning rollers are respectively provided on both sides above the pressure roller, and tensioning swing rods are respectively connected at both ends of the tensioning roller, and the tensioning swing rod is rotatably connected to the tensioning connecting rod at one end away from the tensioning roller, the middle part of the tensioning swing rod is rotatably connected to the side of the pressure roller frame, and the end of the tensioning connecting rod away from the tensioning swing rod is rotatably connected to the sliding member, and the pressure roller frame is located above the tensioning roller and has two guide rollers installed, and the horizontal distance between the guide roller and the pressure roller is greater than the horizontal distance between the tensioning roller and the pressure roller that are close to each other.

7. A gravure color set according to claim 6, characterized in that: The scraper lifting mechanism includes a fixed bracket installed on the frame and a first movable bracket installed on the fixed bracket, a second screw nut is installed in the middle of the first movable bracket, the second screw nut is threadedly connected to the second screw, both ends of the second screw are rotatably connected to the top and bottom of the fixed bracket respectively, a second gear is provided at one end of the second screw, and the second gear is transmission-connected to the third drive motor, the fixed bracket is provided with guide rods on both sides of the second screw, the guide rods are slidably connected to the first movable bracket, and the ink scraper is installed on the first movable bracket.

8. A gravure color set according to claim 7, characterized in that: The first movable bracket is horizontally slidably connected to the second movable bracket, and the scraper is installed on the second movable bracket. The first movable bracket is installed with a fourth driving motor, and the output shaft of the fourth driving motor is eccentrically connected to a connecting piece. A vertical strip hole is provided on the side of the second movable bracket, one end of the connecting piece extends into the strip hole and a bearing is sleeved on its outer periphery, and both sides of the bearing can abut against the inner walls of both sides of the strip hole. A scraper rotating shaft is provided at one end of the second movable bracket close to the scraper, and scraper swing arms are provided at both ends of the scraper rotating shaft and are rotatably connected thereto. The scraper is installed between the two scraper swing arms, and an end of the scraper swing arm away from the scraper is rotatably connected to a second cylinder, and an end of the second cylinder away from the scraper swing arm is rotatably connected to the side of the second movable bracket, and a limit block that can abut against the scraper swing arm is provided on the second movable bracket above the connecting end of the scraper swing arm and the second cylinder.

9. A gravure color set according to claim 8, characterized in that: A scraper holder is provided between the two scraper swing arms, and internal threaded holes and limit pins are provided on the side surfaces of both ends of the scraper holder, and screw countersunk holes corresponding to the positions of the internal threaded holes and limit grooves cooperating with the limit pins are respectively provided on the sides of the scraper swing arms, and the internal threaded holes are threadedly connected with a first adjusting screw, and second adjusting blocks are fixedly installed at both ends of the scraper, and a screw rod portion is provided at one end of the second adjusting block away from the scraper, and a locking nut is threadedly connected to the screw rod portion, and a locking retaining ring is detachably connected to the end of the screw rod portion, and an adjusting groove is provided at both ends of the scraper holder, and a U-shaped adjusting seat is fitted in the adjusting groove, and a U-shaped locking hole for the screw rod portion to pass through is provided at the bottom of the adjusting groove, and the locking nut can abut against both sides of the locking hole of the scraper holder, and the An adjusting threaded hole is provided at the bottom of the adjusting seat, and the adjusting threaded hole is threadedly connected with a second adjusting screw, the second adjusting screw passes through the second adjusting block and one end of its nut can abut against the second adjusting block, the second adjusting screw is located between the second adjusting block and the adjusting seat and is sleeved with an adjusting spring, the scraper frame is provided with an avoidance hole corresponding to the position of the second adjusting screw, a second adjusting knob is provided on one side of the adjusting seat, the second adjusting knob is threadedly connected with a fastening screw, the scraper frame is provided with a fastening through hole, the outer periphery of the fastening screw is sleeved with an anti-loosening spring with one end abutting against the nut of the fastening screw and the other end abutting against the inner wall of the fastening through hole, the second adjusting knob is eccentrically connected to the fastening screw and rotating the second adjusting knob can make its protruding part abut against or separate from the top of the adjusting seat.

10. A gravure color set according to any one of claims 1 to 4, characterized in that: The traction roller group includes a traction mechanism for pulling the substrate feeding, a color registration mechanism for color registration adjustment before printing, and a correction mechanism for correcting the substrate after printing. The color registration mechanism includes a fifth driving motor installed on the frame, a third rotating shaft connected to the fifth driving motor by transmission, and a color registration roller. The two ends of the third rotating shaft are connected to a third screw rod through a bevel gear transmission. The third screw rod is rotatably installed on the frame. The third screw rod is spirally connected to a third screw rod nut. One side of the third screw rod nut is connected to the end of the color registration roller, and the other side is slidably connected to the frame. The correction mechanism includes a correction roller, a mounting seat installed on the frame, and a correction adjustment screw threadedly connected to the end of the correction roller. A strip-shaped adjustment hole is provided on the side of the mounting seat close to the correction roller. One end of the correction adjustment screw passes through the mounting seat and is connected to the adjustment hole, and the other end is connected to an adjustment handle. The outer sleeve of the correction adjustment screw is provided with a stabilizing spring, one end of which abuts against the end of the correction roller and the other end abuts against the inner wall of the mounting seat at the adjustment hole.

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