Online board changing device of corrugated board printing machine

Abstract

The utility model relates to the technical field of carton printing, in particular to an online plate changing device of a corrugated board printing machine, which comprises a machine frame and a plurality of printing roller sets distributed on the machine frame up and down, and a vacuum adsorption box is arranged on the machine frame and located on the feeding side of the printing roller sets. A front edge paper feeding mechanism for conveying corrugated boards is arranged in the vacuum adsorption box; gaps used for conveying paperboards are reserved between the printing roller sets, and the two ends of each printing roller set are connected with lifting mechanisms used for adjusting the gaps correspondingly. A plate changing mechanism is arranged on the lifting mechanism on one side, and the plate changing mechanism is in transmission connection with the printing roller set and the lifting mechanisms through linkage assemblies; therefore, the printing roller set can conduct gap adjustment and online plate replacement according to paperboards with different thicknesses. According to the utility model, the problems of incapability of online plate replacement and low efficiency when the gap between the printing rollers is adjusted and the printing plate is replaced in the traditional printing machine are solved, and the overall performance and the production efficiency of the printing machine are improved.

Description

TECHNICAL FIELD

[0001] The device relates to the technical field of carton printing, and in particular to an online plate changing device of a corrugated board printing machine. BACKGROUND

[0002] At present, printing work of corrugated board applied to cartons is performed by a special printing machine, and a printing roller is commonly used in the industry to realize printing.

[0003] However, the traditional double-sided synchronous printing is driven by the same motor to synchronously rotate the upper and lower printing rollers, and the synchronous printing is realized through the gap between the upper and lower printing rollers.

[0004] In addition, the existing corrugated board printing machine also uses a planetary gear mechanism to adjust the position of the printing plate on the printing roller and replace the printing plate. Invention content

[0005] To solve the technical defects in the background art, the purpose of the present application is to provide an online plate changing device of a corrugated board printing machine to solve the problems of difficulty and low efficiency in adjusting the gap between the printing rollers and replacing the printing plate of the traditional printing machine, and to improve the overall performance and production efficiency of the printing machine.

[0006] To achieve the above purpose, the present application adopts the following technical solutions:

[0007] The utility model provides a kind of change edition driving device of corrugated board printing machine, including frame and multiple groups of printing roller group being arranged on the frame in up and down distribution, the frame is located the feeding side position of printing roller group and is provided with vacuum suction box, front edge paper feeding mechanism for conveying corrugated paper is provided in the vacuum suction box;Gap for paperboard conveying is left between the printing roller group, and the both ends of printing roller group are respectively connected with lifting mechanism for adjusting gap;Change edition mechanism is provided on the lifting mechanism in one side, and change edition mechanism is respectively connected with printing roller group, lifting mechanism by setting linkage assembly transmission;With the synchronous cooperation of lifting mechanism and change edition mechanism, so that the printing roller group adjusts gap and on-line change edition according to different thickness paperboard.

[0008] Preferably, the change edition mechanism includes a change edition motor, a change edition shaft, and an electromagnetic clutch. The output end of the change edition motor is in transmission connection with one end of the change edition shaft. The electromagnetic clutch is arranged between the change edition shaft and the change edition motor, and is in matched connection with the driving motor. The change edition shaft is arranged in parallel at the back side of the printing roller group, and the both ends of the change edition shaft are rotationally connected to the frame through a gear box.

[0009] Preferably, the lifting mechanism includes lifting guide rails arranged on the both side walls of the frame, a sliding frame slidingly connected to the lifting guide rails, and a screw rod assembly for driving the sliding frame to move up and down along the lifting guide rails. The sliding frame is connected with the lifting guide rails through a sliding block, and is fixedly connected to the both ends of the printing roller group. The screw rod assembly includes a driving motor, a screw rod connected with the output shaft of the driving motor, and a nut seat threadedly matched with the screw rod. The nut seat is arranged at the both ends of the screw rod, and is fixedly connected to the sliding frame and the frame, respectively. The sliding frame is driven to move up and down by the rotation of the screw rod.

[0010] Preferably, the printing roller group includes a printing plate roller, a printing roller, and an ink supply roller. The printing plate roller is located between the printing roller and the ink supply roller, and the surface of the printing plate roller is provided with a mesh structure. The printing roller is located below the printing plate roller, and is at the same horizontal height as the front edge paper feeding mechanism. The ink supply roller is connected with a swing assembly at one end, and the swing assembly is movably connected to the sliding frame.

[0011] Preferably, the linkage assembly includes a driving pulley mounted on the output shaft of the servo motor, and a plurality of driven pulleys mounted on the shaft ends of the printing roller group. The driving pulley and the driven pulleys are connected through a belt. The servo motor drives the printing roller group to rotate synchronously through the rotation of the pulleys.

[0012] Preferably, the front edge paper feeding mechanism comprises a belt paper feeding assembly, a suction paper feeding assembly and a distance adjusting assembly, the belt paper feeding assembly is provided in multiple groups, the multiple groups of the belt paper feeding assembly are slidingly connected to the distance adjusting assembly at equal intervals, the suction paper feeding assembly is fixed to one side of the rack, and the suction paper feeding assembly is connected to the belt paper feeding assembly in a matched mode.

[0013] Preferably, the belt paper feeding assembly comprises a paper feeding motor, paper feeding rollers and a transmission belt, the paper feeding motor is arranged in the vacuum suction box, and the output shaft of the paper feeding motor is rotationally connected to the paper feeding rollers, and a plurality of synchronous rollers are further arranged between the paper feeding rollers, and the outer sides of the paper feeding rollers are rotationally connected to the transmission belt through sleeving.

[0014] Preferably, the suction paper feeding assembly comprises a fixing frame, a suction fan and an air duct, the fixing frame is fixed to one side of the rack, the suction fan is mounted on the fixing frame, and the suction fan is provided in multiple groups, and the multiple groups of the suction fan are connected to the vacuum suction box in a communicated mode through the air duct.

[0015] Preferably, the distance adjusting assembly comprises a transverse support, a transverse sliding rail arranged on the transverse support and a plurality of sliding supports slidingly connected to the transverse sliding rail, the transverse support is arranged along the length direction of the rack and fixed to the side walls of the rack at both ends, the transverse sliding rail is provided in at least two groups, and the two groups of the transverse sliding rail are arranged in parallel at the top end of the transverse support, one end of the sliding support is slidingly connected to the transverse sliding rail through a sliding block, the other end is rotationally connected to a transmission rod, both ends of the transmission rod are threadedly connected to the rack at both sides, and one end of the transmission rod is rotationally connected to a driving member.

[0016] Preferably, a horizontal baffle is arranged above the front edge paper feeding mechanism on the rack, the horizontal baffle is arranged on one side below the upper printing roller, and both ends of the horizontal baffle are fixed to both sides of the rack.

[0017] In summary, the beneficial effects of the online plate changing device of the corrugated paperboard printing machine are as follows:

[0018] The lifting mechanism and the printing roller group are matched and driven, so that the gap between the upper and lower printing roller groups can be quickly and accurately adjusted, the plate changing space is increased, the plate changing operation is more convenient, online plate changing can be realized, the plate changing time is greatly shortened, and the production efficiency is improved; meanwhile, the printing roller group is synchronously driven to rotate through the linkage assembly, the rotating speed is faster than that of the planetary gear transmission, the requirement of quick single operation in the corrugated paperboard printing production can be met, and the production efficiency is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic view of the online plate changing device of the corrugated paperboard printing machine of the utility model;

[0020] Figure 2 is another side structure schematic view of the online version changing device of the corrugated board printing machine of the utility model;

[0021] Figure 3 is front view of the online version changing device of the corrugated board printing machine of the utility model;

[0022] Figure 4 is side view of the online version changing device of the corruggated board printing machine of the utility model;

[0023] Figure 5 is Figure 3 sectional view of B-B.

[0024] Explanation of reference numerals in the drawing:

[0025] 1, rack;2, printing roller group;21, impression roller;22, printing plate roller;23, ink supply roller;24, servo motor;25, swing assembly;251, cradle;252, drive motor;253, spring controller;3, front edge paper feeding mechanism;31, belt paper feeding assembly;311, paper feeding motor;312, paper feeding roller;313, conveying belt;32, air suction paper feeding assembly;321, fixed frame;322, air suction fan;323, air duct;33, distance adjusting assembly;331, transverse support;332, transverse slide rail;333, sliding support;334, transmission rod;335, driving part;4, lifting mechanism;41, lifting guide rail;42, sliding frame;43, screw rod assembly;431, driving motor;432, screw rod;433, nut seat;5, version changing mechanism;51, version changing motor;52, version changing shaft;521, gear box;53, electromagnetic clutch;6, linkage assembly;61, driving pulley;62, driven pulley;63, belt;7, horizontal baffle. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by those skilled in the art belong to the protection scope of the utility model.

[0027] Those skilled in the art should understand that in the disclosure of the utility model, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, therefore the above terms cannot be understood as a limitation on the utility model.

[0028] In the description of the utility model, if there is a word such as "several" description, its meaning is one or more, the meaning of multiple is two and more, greater than, less than, more than and the like are not included in the number, above, below, within and the like are understood as including the number. If the first, second, third is described, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0029] The following will be described in detail in combination with the accompanying drawings Figures 1-5 The embodiment of the online version changing device of the corrugated paperboard printing machine is further described in detail.

[0030] An online version changing device of a corrugated paperboard printing machine, as shown in Figure 1 , 2 Fig. 1, comprises a rack 1 and a plurality of groups of printing roller groups 2 arranged in an up-down distribution on the rack 1. The rack 1 is provided with a vacuum suction box at the feeding side position of the printing roller groups 2. The vacuum suction box is provided with a front edge paper feeding mechanism 3 for conveying corrugated paperboard. The printing roller groups 2 are left with a gap for paperboard conveying, and the two ends of the printing roller groups 2 are respectively connected with lifting mechanisms 4 for adjusting the gap. The lifting mechanism 4 on one side is provided with a version changing mechanism 5. The version changing mechanism 5 is drivingly connected between the printing roller groups 2 and the lifting mechanisms 4 through the setting of a linkage assembly 6. Through the synchronous cooperation of the lifting mechanisms 4 and the version changing mechanism 5, the printing roller groups 2 can adjust the gap and change the version online according to paperboards of different thicknesses.

[0031] Specifically, when printing, the corrugated paper to be printed is conveyed to the printing roller group 2 by the front edge paper feeding mechanism 3, and under the action of the vacuum suction box, the corrugated paper is stably conveyed; at the same time, the lifting mechanism 4 is started by the control system, so that it can adjust the gap between the upper and lower printing roller groups 2 according to corrugated paper of different sizes and thicknesses, thereby improving the printing quality; and when the printing plate needs to be replaced, the operation of the printing machine is stopped by the control system; the lifting mechanism 4 is used to control the upward movement of the printing roller group 2, thereby increasing the gap between the printing roller groups 2 and providing enough space for printing plate replacement; at the same time, the plate changing mechanism 5 is synchronized with the lifting mechanism 4 and the printing roller group 2 through the action of the linkage assembly 6, thereby solving the problems of difficulty and low efficiency in adjusting the gap between the printing rollers and replacing the printing plate of the traditional printing machine, and improving the overall performance and production efficiency of the printing machine.

[0032] In this embodiment, the plate changing mechanism 5 includes a plate changing motor 51, a plate changing shaft 52, and an electromagnetic clutch 53. The output end of the plate changing motor 51 is in transmission connection with one end of the plate changing shaft 52. The electromagnetic clutch 53 is arranged between the plate changing shaft 52 and the plate changing motor 51, and is in cooperative connection with the drive motor 431. The plate changing shaft 52 is arranged in parallel at the rear side of the printing roller group 2, and both ends of the plate changing shaft 52 are rotatably connected to the rack 1 through a gear box 521.

[0033] Specifically, the plate changing motor 51 is installed on one side of the lifting mechanism 4, the output end of the plate changing motor 51 is in transmission connection with one end of the plate changing shaft 52 through a shaft coupling, the electromagnetic clutch 53 is installed between the plate changing shaft 52 and the plate changing motor 51, and both ends of the plate changing shaft 52 are rotatably connected to the rack 1 through the gear box 521; at the same time, the plate changing motor 51 is started, the rotation of the plate changing shaft 52 is tested, and the power transmission of the plate changing shaft 52 is controlled through the electromagnetic clutch 53. The servo motor 24 is started, and the transmission of the belt 63 in the linkage assembly 6 is observed to ensure that the printing roller group 2 can rotate synchronously.

[0034] In this embodiment, the lifting mechanism 4 includes lifting guide rails 41 arranged on the two side walls of the rack 1, a sliding frame 42 slidably connected to the lifting guide rails 41, and a lead screw assembly 43 for driving the sliding frame 42 to move up and down along the lifting guide rails 41; the sliding frame 42 is connected to the lifting guide rails 41 through a sliding block, and the sliding frame 42 is fixedly connected to both ends of the printing roller group 2.

[0035] Specifically, the screw rod assembly 43 comprises a driving motor 431, a screw rod 432 connected with an output shaft of the driving motor 431, and a nut seat 433 threadedly matched with the screw rod 432, the nut seat 433 is arranged at two ends of the screw rod 432, and the nut seat 433 is fixedly connected with the sliding frame 42 and the rack 1 respectively; the screw rod 432 is rotated to drive the sliding frame 42 to move up and down; thereby the gap between the upper and lower printing rollers can be quickly and accurately adjusted, the printing plate replacement space is increased, the printing plate replacement operation is more convenient, the plate replacement time is greatly shortened, and the production efficiency is improved.

[0036] In the embodiment, as shown in Figure 4 the printing roller set 2 comprises a printing plate roller 22, an impression roller 21 and an ink supply roller 23, one end of the printing plate roller 22, the impression roller 21 and the ink supply roller 23 is drivingly connected with a plurality of servo motors 24, the plurality of servo motors 24 is installed on the sliding frame 42; the printing plate roller 22 is located between the impression roller 21 and the ink supply roller 23, and the surface of the printing plate roller 22 is provided with a mesh structure; the impression roller 21 is located below the printing plate roller 22, and the impression roller 21 is located at the same horizontal height as the front edge paper feeding mechanism 3; one end of the ink supply roller 23 is connected with a swing assembly 25, and the swing assembly 25 is movably connected to the sliding frame 42.

[0037] Specifically, the printing plate roller 22 adopts a split structure and is composed of a roller core and a detachable printing sleeve. The sleeve surface is pre-installed with flexible printing plates of different patterns, and the sleeve is quickly locked on the roller core through the inflation shaft. The roller core is provided with a conical clamping groove at both ends. When the printing plate is replaced, the inflation shaft is controlled by the electromagnetic clutch 53 to release pressure, the printing plate is automatically separated from the roller core, the mechanical arm on the plate replacement shaft 52 moves the old printing plate out and pushes the new printing plate into the positioning groove. The pneumatic gripper is integrated at the end of the plate replacement shaft 52, and a pressure sensor is embedded in the inner side of the pneumatic gripper to reduce the coaxiality error of the printing plate during installation.

[0038] In order to facilitate the ink of the printing plate roller 22, the swing assembly 25 comprises a rocker 251 arranged on the left and right sides of the sliding frame 42, the rocker 251 is positioned on the sliding frame 42 through a rotating shaft, and the movable end of the rocker 251 is connected with a driving motor 252 and a spring controller 253, the output end of the driving motor 252 is drivingly connected with the movable end of the rocker 251, and the spring controller 253 is linkage connected with the output end of the driving motor 252 through a connecting plate, and the ink supply roller 23 is rotatably positioned on the rocker 251, so that the ink supply roller 23 can be driven to swing above the printing plate roller 22 by means of the rocker 251, thereby facilitating the ink of the printing plate roller 22.

[0039] In the embodiment, as shown in Figure 3As shown, linkage assembly 6 includes a driving pulley 61 mounted on the output shaft of servo motor 24, and a plurality of driven pulleys 62 mounted on the shaft end of printing roller set 2, driving pulley 61 and driven pulleys 62 are connected by belt 63, servo motor 24 drives printing roller set 2 to rotate synchronously through belt 63.

[0040] Specifically, driving pulley 61 is mounted on the output shaft of servo motor 24, driven pulleys 62 are mounted on the shaft end of printing roller set 2, and driving pulley 61 and driven pulleys 62 are connected by belt 63, the tension of belt 63 is adjusted, and when printing roller set 2 is driven to rotate by servo motor 24, it can rotate synchronously through the action of linkage assembly 6, so that the rotational speed of printing plate roller 22 is consistent with that of ink supply roller 23, so as to avoid the influence of differential speed on the printing effect of corrugated paper. And by using the belt 63 wheel transmission mode instead of the planetary gear transmission mode, compared with the planetary gear transmission, the rotation speed is faster, which can meet the demand of quick single job in corrugated paper printing production, and further improve the production efficiency.

[0041] In this embodiment, as shown in Figure 3 and Figure 5 As shown, front edge paper feeding mechanism 3 includes belt paper feeding assembly 31, air suction paper feeding assembly 32 and distance adjusting assembly 33, belt paper feeding assembly 31 is provided in multiple groups, multiple groups of belt paper feeding assembly 31 are slidingly connected on distance adjusting assembly 33 at equal intervals, air suction paper feeding assembly 32 is fixed on one side of rack 1, and air suction paper feeding assembly 32 is connected with belt paper feeding assembly 31 in cooperation.

[0042] Specifically, belt paper feeding assembly 31 includes paper feeding motor 311, paper feeding roller 312 and conveying belt 313, paper feeding motor 311 is arranged in the vacuum suction box, and the output shaft of paper feeding motor 311 is rotatably connected with paper feeding roller 312, a plurality of synchronous rollers are further arranged between paper feeding roller 312, and the outer side of paper feeding roller 312 is rotatably connected with conveying belt 313 by sleeving; air suction paper feeding assembly 32 includes fixed frame 321, air suction fan 322 and air duct 323, fixed frame 321 is fixedly connected on one side of rack 1, air suction fan 322 is mounted on fixed frame 321, and air suction fan 322 is provided in multiple groups, multiple groups of air suction fan 322 are connected with the vacuum suction box in communication through air duct 323; when air suction fan 322 works, the corrugated paper on conveying belt 313 is subjected to suction force through the vacuum suction box, so that the paper board is kept stable during conveying, and the automatic paper feeding function is realized.

[0043] When conveying corrugated paperboards of different sizes, the distance between the belt paper conveying assemblies 31 needs to be adjusted according to the length and width of the paperboard, and the belt paper conveying assemblies 31 are driven by the distance adjusting assembly 33 to adjust the distance according to the size of the corrugated paperboard, wherein the distance adjusting assembly 33 comprises a transverse support 331, transverse sliding rails 332 arranged on the transverse support 331, and a plurality of sliding supports 333 slidably connected to the transverse sliding rails 332, the transverse support 331 is arranged along the length direction of the rack 1 and fixed at both ends on the side walls of the rack 1, the transverse sliding rails 332 are arranged in at least two groups and parallelly arranged at the top end of the transverse support 331, one end of the sliding support 333 is slidably connected to the transverse sliding rail 332 by arranging a sliding block, and the other end is rotatably connected with a transmission rod 334, both ends of the transmission rod 334 are threadedly connected to both sides of the rack 1, and one end of the transmission rod 334 is rotatably connected with a driving motor 431, the driving motor 431 drives the transmission rod 334 to rotate, thereby driving the sliding support 333 to move along the transverse sliding rail 332, and further driving the belt paper conveying assemblies 31 to move synchronously, so that the distance between the adjacent two belt paper conveying assemblies 31 is quickly adjusted to meet the conveying of corrugated paperboards of different sizes.

[0044] In the embodiment, as shown in Figure 1 A horizontal baffle 7 is arranged above the front edge paper conveying mechanism 3 on the rack 1, the horizontal baffle 7 is arranged on one side below the upper printing roller, and both ends of the horizontal baffle 7 are fixed on both sides of the rack 1.

[0045] Specifically, the horizontal baffle 7 is in a flat plate structure, the length of the horizontal baffle 7 is greater than or equal to the length of the printing roller, and the width of the horizontal baffle 7 is greater than the diameter of the printing roller; in general, the length of the horizontal baffle 7 is equal to the width of the rack 1, which is convenient for installation and can accommodate the parts or other sundries that may fall during plate replacement in the maximum range, thereby better protecting the normal operation of the printing machine. The horizontal baffle 7 is made of aluminum plate. According to the actual situation of the equipment, the horizontal baffle 7 can also be made of a flat plate structure of other materials, in addition, the horizontal baffle 7 can be made of an integral flat plate structure or a split structure formed by splicing multiple flat plates. The two sides of the horizontal baffle 7 are respectively provided with a fixed frame and a movable frame, along the moving direction of the horizontal baffle 7, the movable frame is arranged on the front side of the horizontal baffle 7, and the fixed frame is arranged on the rear side of the horizontal baffle 7. The fixed frame is fixedly installed on the rack 1, and the movable frame is movably installed on the rack 1; the movable frame and the fixed frame are both in a long strip shape with an L-shaped cross section, and the front side of the horizontal baffle 7 is always fixedly connected with the movable frame.

[0046] The working principle of the utility model is as follows:

[0047] When the printing operation is performed, first, the corrugated paper to be printed is placed on the paper feeding platform, and the air suction fan 322 and the paper feeding motor 311 are started; the suction force generated by the air suction fan 322 makes the paperboard stable on the conveying belt 313, and the paper feeding motor 311 drives the paper feeding roller 312 and the synchronous roller to rotate, driving the paperboard to the printing roller group 2. The driving motor 431 of the lifting mechanism 4 is started through the control system to make the lead screw 432 rotate, driving the sliding frame 42 to descend, reducing the gap between the upper and lower printing roller groups 2, so as to adapt to the thickness of the thin corrugated paperboard; at the same time, the servo motor 24 of the printing roller group 2 is started, driving the impression roller 21, the printing plate roller 22 and the ink supply roller 23 to rotate through the linkage assembly 6; the ink supply roller 23 oscillates above the printing plate roller 22 under the drive of the oscillating assembly 25, inks the printing plate roller 22, the printing plate roller 22 transfers ink to the corrugated paperboard, the impression roller 21 presses the paperboard, and the printing is completed; during the printing process, the tension of the corrugated paperboard is monitored in real time, and fine adjustment is made through the adjusting mechanism to ensure the printing quality, and the corrugated paperboard is output from the printing machine. When it is necessary to replace the printing plate, first, the operation of the printing machine is stopped through the control system; the driving motor 431 of the lifting mechanism 4 is started, and the upper printing roller group 2 is moved upward by the lead screw 432 transmission, increasing the gap between the upper and lower printing roller groups 2, providing enough space for printing plate replacement. The plate changing motor 51 is started, and the plate changing shaft 52 is rotated through the electromagnetic clutch 53 control, the operator removes the old printing plate from the printing plate roller 22, and installs the new printing plate. After installation, the gap between the upper and lower printing roller groups 2 is adjusted again through the control system to meet the requirements of the new printing plate and the corrugated paperboard to be printed; then the printing machine is restarted for printing.

[0048] The embodiments of the specific implementation are the preferred embodiments of the present application, not limited to the protection scope of the present application, wherein the same parts are indicated by the same reference numerals. Therefore: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A printing machine on-line plate changing device for corrugated board, comprising a frame and a plurality of groups of printing rollers arranged in an upper and lower distribution on the frame, characterized in that, The rack is provided with a vacuum suction box at a feeding side position of the printing roller set, the vacuum suction box is provided with a front edge paper feeding mechanism for conveying corrugated paper; a gap for conveying paperboard is left between the printing roller set, and lifting mechanisms for adjusting the gap are connected to both ends of the printing roller set; a plate changing mechanism is arranged on the lifting mechanism at one side, and the plate changing mechanism is drivingly connected to the printing roller set and the lifting mechanism through a linkage assembly; the printing roller set is adjusted according to paperboards of different thicknesses and the plate changing is performed on line through the synchronous cooperation of the lifting mechanism and the plate changing mechanism.

2. The on-line changeover device for corrugated board printing presses according to claim 1, characterized in that, The plate changing mechanism comprises a plate changing motor, a plate changing shaft and an electromagnetic clutch, the output end of the plate changing motor is drivingly connected to one end of the plate changing shaft, the electromagnetic clutch is arranged between the plate changing shaft and the plate changing motor, and the electromagnetic clutch is connected to the driving motor in cooperation; the plate changing shaft is arranged in parallel at the back side of the printing roller set, and both ends of the plate changing shaft are rotatably connected to the rack through a gear box.

3. The on-line changeover device for corrugated board printing presses according to claim 1, characterized in that, The lifting mechanism comprises lifting guides arranged on both side walls of the rack, a sliding frame slidingly connected to the lifting guides, and a lead screw assembly for driving the sliding frame to move up and down along the lifting guides; the sliding frame is connected to the lifting guides through a sliding block, and the sliding frame is fixedly connected to both ends of the printing roller set; the lead screw assembly comprises a driving motor, a lead screw connected to the output shaft of the driving motor, and a nut seat threadedly connected to the lead screw; the nut seat is arranged at both ends of the lead screw, and the nut seat is fixedly connected to the sliding frame and the rack, respectively; the sliding frame moves up and down through the rotation of the lead screw.

4. The on-line changeover device for corrugated board printing presses according to claim 3, characterized in that, The printing roller set comprises an impression roller, a printing plate roller and an ink supply roller, a plurality of servo motors are drivingly connected to one end of the impression roller, the printing plate roller and the ink supply roller, respectively, and the plurality of servo motors are mounted on the sliding frame; the printing plate roller is located between the impression roller and the ink supply roller, and the surface of the printing plate roller is provided with a mesh structure; the impression roller is located below the printing plate roller, and the impression roller is located at the same horizontal height as the front edge paper feeding mechanism; one end of the ink supply roller is connected to a swing assembly, and the swing assembly is movably connected to the sliding frame.

5. The online changeover apparatus for a corrugated board printing press according to claim 1, wherein, The linkage assembly comprises a driving pulley mounted on the output shaft of the servo motor and a plurality of driven pulleys mounted on the shaft ends of the printing roller set, the driving pulley and the driven pulleys are connected through a belt, and the servo motor drives the printing roller set to rotate synchronously through the rotation of the pulleys.

6. The online changeover apparatus for a corrugated board printing press according to claim 1, characterized in that, The front edge paper feeding mechanism comprises a belt paper feeding assembly, a suction paper feeding assembly and a distance adjusting assembly, a plurality of belt paper feeding assemblies are provided, the plurality of belt paper feeding assemblies are slidingly connected to the distance adjusting assembly at equal intervals, the suction paper feeding assembly is fixed to one side of the rack, and the suction paper feeding assembly is connected to the belt paper feeding assembly in cooperation.

7. The online changeover device for corrugated board printing presses according to claim 6, characterized in that, The belt paper feeding assembly comprises a paper feeding motor, paper feeding rollers and a conveying belt, the paper feeding motor is arranged in the vacuum suction box, and the output shaft of the paper feeding motor is rotatably connected to the paper feeding rollers, a plurality of synchronous rollers are further arranged between the paper feeding rollers, and the outer sides of the plurality of synchronous rollers and the paper feeding rollers are rotatably connected through sleeving the conveying belt.

8. The online changeover apparatus for a corrugated board printing press according to claim 6, characterized in that, The air suction paper feeding assembly comprises a fixing frame, an air suction fan and an air duct, the fixing frame is fixed to one side of the rack, the air suction fan is installed on the fixing frame, and the air suction fan is provided in multiple groups, and the multiple groups of air suction fans are communicated with the vacuum suction box through the air duct.

9. The online changeover apparatus for a corrugated board printing press according to claim 6, characterized in that, The distance adjusting assembly comprises a transverse support, transverse sliding rails arranged on the transverse support, and a plurality of sliding supports slidably connected to the transverse sliding rails, the transverse support is arranged along the length direction of the rack and is fixed at both ends to the side walls of the rack, the transverse sliding rails are provided in at least two groups, and the two groups of transverse sliding rails are arranged in parallel at the top end of the transverse support, one end of the sliding support is slidably connected to the transverse sliding rail through a sliding block, the other end is rotatably connected with a transmission rod, both ends of the transmission rod are threadedly connected to both sides of the rack, and one end of the transmission rod is rotatably connected with a driving member.

10. The online changeover apparatus for a corrugated board printing press according to claim 1, characterized in that, A horizontal baffle is arranged above the front edge paper feeding mechanism on the rack, the horizontal baffle is arranged on one side below the upper printing roller, and both ends of the horizontal baffle are fixed to both sides of the rack.

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