A double-sided printing machine

Abstract

The present invention belongs to the technical field of printing equipment, in particular to a double-sided printing machine, comprising an unwinding section, a first tensioning section, a front printing section, a back printing section, a second tensioning section and a rewinding section arranged in sequence from feeding to discharging; the front printing section comprises a front printing scraper tool and a front ink curing tool; the back printing section comprises a back printing scraper tool and a back ink curing tool; the unwinding section and the rewinding section are arranged in a mirror-image symmetry; the front printing scraper tool and the back printing scraper tool are arranged in a mirror-image symmetry. The double-sided printing machine can achieve the effects of rapid unwinding and rewinding of printed paper materials and double-sided printing, thereby improving work efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of printing equipment, in particular to a double-sided printing machine. Background Art

[0002] Most of the existing printed paper labels are produced using single-sided printing, which is inefficient and requires manual cutting and then reloading before printing. This loading and unloading method will seriously affect the production efficiency of the entire production equipment.

[0003] For example, a label printer (application number 201720861982.2) published on the Chinese Patent Network has a single roller unwinding and rewinding mechanism at both ends. When replacing the unwinding and rewinding structure, the machine needs to be stopped for operation, which greatly delays production efficiency, and can only achieve single-sided single-time printing. When encountering double-sided printing, it is necessary to turn over and print again, which is inefficient;

[0004] Another example is a label making device and a label printing machine with application number 201180010159.6, in which the unwinding and rewinding mechanisms at both ends also adopt a single roller type, which seriously affects the production efficiency. Summary of the invention

[0005] Based on the technical problem of low efficiency of existing label paper production equipment, the present invention proposes a double-sided printing machine.

[0006] A double-sided printing machine comprises an unwinding section, a first tensioning section, a front printing section, a back printing section, a second tensioning section and a winding section which are sequentially arranged from feeding to discharging;

[0007] The front printing unit includes a front printing scraper tool and a front ink curing tool; the back printing unit includes a back printing scraper tool and a back ink curing tool;

[0008] The unwinding part and the rewinding part are arranged in mirror symmetry;

[0009] The front side printing and scraping tooling and the back side printing and scraping tooling are arranged in a mirror-symmetrical manner;

[0010] The first tensioning portion and the second tensioning portion are arranged in mirror symmetry;

[0011] The front ink curing tooling and the back ink curing tooling are arranged in a mirror-symmetrical manner;

[0012] The first tensioning portion includes an automatic unwinding material receiving device, and the automatic unwinding material receiving device corresponds to the unwinding portion;

[0013] The second tensioning part further comprises an automatic material receiving device for winding and receiving, and the automatic material receiving device for winding and receiving corresponds to the winding part;

[0014] The inner surface of the automatic unwinding material receiving device is provided with a sleeve plate and a third cylinder, one end of the third cylinder is hinged to the sleeve plate, and the other end is connected to the automatic unwinding material receiving device, the sleeve plate is slidably connected to the automatic unwinding material receiving device through a slideway, and the sleeve plate can move horizontally along the slideway;

[0015] The inner surface of the sleeve plate is provided with a hinge plate and a second cylinder, an auxiliary roller is installed between the two sleeve plates, and a supporting roller is installed between the two hinge plates; one end of the second cylinder is connected to the hinge plate, and the other end is connected to the sleeve plate;

[0016] A cutting knife is installed between the two hinged plates, and the cutting knife is away from the second cylinder;

[0017] The unwinding automatic material receiving device and the rewinding automatic material receiving device are arranged in a mirror image structure.

[0018] Further, the unwinding section includes a double-station unwinding device;

[0019] The double-station unwinding device includes a fixed plate, the fixed plate is a cross-shaped structure, a connecting plate is installed on one surface of both ends of the fixed plate, a first cylinder is installed on one end of the connecting plate, a limiting roller is installed between the other ends of two adjacent connecting plates, a roller shaft is installed between one surface of both ends of the two adjacent fixed plates, and a clamping roller group is installed between the upper and lower ends of the two adjacent fixed plates;

[0020] The reeling section comprises a double-station reeling device;

[0021] The double-station winding device and the double-station unwinding device are arranged in a mirror image structure.

[0022] Furthermore, the front printing scraper tooling comprises a plate roller and a pressure roller, and the plate roller and the pressure roller are used in pairs; a relief plate is provided on the plate roller, and two end protection devices are fixedly connected to the outer surface of the plate roller near the end;

[0023] The end protection device protrudes outwards, and the protrusion height is between the height of the plate roller body and the relief plate;

[0024] The plate roller is independently controlled by an independent servo motor.

[0025] The front printing unit and the back printing unit both include a plurality of electronic marking devices;

[0026] The electronic alignment device of the front printing part is arranged on a guide roller, and the guide roller is multiple, and is respectively arranged before the front printing scraper tooling, after the front printing scraper tooling and before the front ink curing tooling;

[0027] The electronic marking device of the reverse printing unit is arranged in mirror symmetry with the electronic marking device of the front printing unit.

[0028] Furthermore, the front printing glue scraping tool also includes a scraper tool, the scraper tool is adjacent to the plate roller, and the scraper tool includes a horizontal adjustment component, a height adjustment component, an angle adjustment component and a scraper.

[0029] Further, the angle adjustment assembly includes a worm gear set and a fourth cylinder;

[0030] The worm gear set is provided with a polished rod, and the polished rod can rotate around the axis as the worm gear set moves;

[0031] One end of the fourth cylinder is extended and fixedly connected to the polished rod, and the other end is hinged to the horizontal adjustment assembly, the horizontal adjustment assembly is sleeved with the polished rod, and the scraper is located at one end of the horizontal adjustment assembly;

[0032] The angle adjustment assembly can control the scraper to rotate along the lead screw;

[0033] One end of the height adjustment component is sleeved on the polished rod, and the other end is fixed to the bottom of the front printing scraper tooling.

[0034] Furthermore, the horizontal adjustment assembly comprises a hand wheel, a lead screw and a sliding member, and the hand wheel can control the scraper to move horizontally;

[0035] The height adjustment assembly includes a plurality of fifth cylinders, and the fifth cylinders can control the scraper to move horizontally.

[0036] Furthermore, the front ink curing tooling is provided with 3-6 groups of UV lamps, each group of UV lamps is provided with 2-5 UV lamp tubes, and one side of each group of UV lamps is provided with fans equal to the number of the lamp groups, and any lamp tube is connected to the fan through an independent air duct, and the fan is used to extract the smoke generated by the curing in the lampshade of the UV lamp; any of the fans is independently controlled;

[0037] The reverse ink curing tooling is arranged in a mirror-image manner with the front ink curing tooling structure.

[0038] Further, the front ink curing tooling is provided with 3 groups of UV lamps, and the temperatures of each group of UV lamps from the feeding direction to the discharging direction are T0°C, T0-(0-5)°C, and T0-(5-10)°C, respectively;

[0039] The reverse ink curing tooling is provided with 3 groups of UV lamps, and the temperatures of each group of UV lamps from the feeding direction to the discharging direction are T1°C, T1-(0-5)°C, and T1-(5-10)°C, respectively.

[0040] Furthermore, the power of each group of UV lamps is the same, and the temperature of each group of UV lamps is controlled by air supply and / or exhaust by a fan.

[0041] Furthermore, a corona treatment device is provided between the first tensioning portion and the front printing portion, and between the front printing portion and the back printing portion.

[0042] Furthermore, the first tensioning part also includes a deviation correction guide tooling; the deviation correction guide tooling is provided with two independently controlled sixth cylinders, one end of the sixth cylinder is hinged to the first tensioning part, and the other end is hinged to the deviation correction guide roller.

[0043] Furthermore, a universal joint is provided on the end of any of the sixth cylinders close to the deviation correction guide roller.

[0044] Furthermore, the deviation-correcting guide tooling in the first tensioning part is 4-6 groups.

[0045] The beneficial effects of the present invention are:

[0046] 1. By setting up a double-station unwinding device and an automatic unwinding material receiving device, the label paper can be quickly retracted and released. When one roller is in operation, the other roller can be installed for standby, saving the time required for replacement and improving replacement efficiency.

[0047] 2. By setting up the front printing part and the back printing part, the double sides of the label paper can be processed simultaneously, and the production efficiency is doubled. The scraper can achieve a three-dimensional adjustment effect on the glue on the surface of the label paper, and has strong applicability.

[0048] 3. By setting the cutting knife, the material on the roller can be quickly cut off when it is almost finished. The cylinder control is used, which is faster and does not require manual cutting, eliminating the safety hazards during manual cutting and improving efficiency.

[0049] 4. By setting up the front printing scraper tooling and the back printing scraper tooling, the double sides of the label paper can be processed simultaneously, and the production efficiency is doubled. The scraper can achieve a three-dimensional adjustment scraping effect on the glue on the surface of the label paper, and has strong applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 A schematic diagram of a double-sided printing machine proposed by the present invention;

[0051] Figure 2 A schematic diagram of a double-sided printing machine provided by the present invention from another angle.

[0052] Figure 3 A three-dimensional diagram of a double-station unwinding device of a double-sided printing press proposed by the present invention;

[0053] Figure 4 A three-dimensional diagram of an automatic unwinding and receiving device for a double-sided printing press proposed by the present invention;

[0054] Figure 5 A three-dimensional diagram of a printing scraper tooling for a double-sided printing machine proposed by the present invention;

[0055] Figure 6 A three-dimensional diagram of a plate roller of a double-sided printing press proposed by the present invention;

[0056] Figure 7 A three-dimensional diagram of a UV lamp of a double-sided printing machine proposed by the present invention;

[0057] Figure 8 A schematic diagram of the system operation of a double-sided printing machine proposed by the present invention;

[0058] In the figure: 1, unwinding part; 10, double-station unwinding device; 101, fixed plate; 102, connecting plate; 103, first cylinder; 104, limit roller; 105, roller shaft; 106, clamping roller group;

[0059] 2. First tensioning part; 20. Automatic unwinding material receiving device; 201. Articulated plate; 202. Support roller; 203. Second cylinder; 204. Cutting knife; 205. Auxiliary roller; 206. Third cylinder; 207. Set plate;

[0060] 21. Correction guide tooling;

[0061] 3. The second tensioning part; 30. Automatic material receiving device for winding;

[0062] 4. Rewinding section; 40. Double-station rewinding device;

[0063] 5. Front printing scraper tooling; 50. Scraper tooling; 501. Fourth cylinder; 502. Fifth cylinder; 503. Worm gear assembly; 504. Scraper; 505. Sliding part; 506. Polished rod; 507. Hand wheel; 509. Lead screw; 51. Plate roller; 510. Letterpress; 511. End protection device;

[0064] 6. Front ink curing tooling; 601. Guide roller; 61. UV lamp; 62. Fan;

[0065] 7. Reverse printing scraper tooling;

[0066] 8. Reverse ink curing tooling;

[0067] 9. Corona treatment device. DETAILED DESCRIPTION

[0068] A double-sided printing machine comprises an unwinding section 1, a first tensioning section 2, a front printing section, a back printing section, a second tensioning section 3 and a winding section 4 which are arranged in sequence from feeding to discharging;

[0069] The front printing section includes a front printing scraper tool 5 and a front ink curing tool 6; the back printing section includes a back printing scraper tool 7 and a back ink curing tool 8;

[0070] The unwinding section 1 and the rewinding section 4 are arranged in mirror symmetry;

[0071] The front printing and scraping tool 5 and the back printing and scraping tool 7 are arranged in mirror symmetry;

[0072] The first tensioning portion 2 and the second tensioning portion 3 are arranged in mirror symmetry;

[0073] The front ink curing tool 6 and the back ink curing tool 8 are arranged in mirror symmetry;

[0074] The first tensioning part 2 comprises an automatic unwinding material receiving device 20, and the automatic unwinding material receiving device 20 corresponds to the unwinding part 1;

[0075] The second tensioning part 3 includes an automatic material receiving device 30 for winding, and the automatic material receiving device 30 for winding corresponds to the winding part 4;

[0076] The inner surface of the unwinding automatic material receiving device 20 is provided with a sleeve plate 207 and a third cylinder 206. One end of the third cylinder 206 is hinged to the sleeve plate 207, and the other end is connected to the unwinding automatic material receiving device 20. The sleeve plate 207 is slidably connected to the unwinding automatic material receiving device 20 through a slideway, and the sleeve plate 207 can move horizontally along the slideway;

[0077] The inner surface of the sleeve plate 207 is provided with a hinge plate 201 and a second cylinder 203, an auxiliary roller 205 is installed between the two sleeve plates 207, and a support roller 202 is installed between the two hinge plates 201; one end of the second cylinder 203 is connected to the hinge plate 201, and the other end is connected to the sleeve plate 207;

[0078] A cutting knife 204 is installed between the two hinged plates 201, and the cutting knife 204 is far away from the second cylinder 203;

[0079] The unwinding automatic material receiving device 20 and the rewinding automatic material receiving device 30 are arranged in a mirror image structure.

[0080] Under normal circumstances, the cutting knife 204 will not come into contact with the printed paper material. When the printed paper material on the unwinding section 1 is almost delivered, the third cylinder 206 will be activated, and the auxiliary roller 205 will follow the sleeve plate 207 to move horizontally against the unwinding section 1. Then the second cylinder 203 will be activated, and the cutting knife 204 will rotate under the limit of the hinged plate 201, thereby cutting off the printed paper material and achieving a quick cutting effect without manual cutting, eliminating the safety hazards during manual cutting and improving efficiency.

[0081] Further, the unwinding section 1 includes a double-station unwinding device 10;

[0082] The double-station unwinding device 10 includes a fixed plate 101, which is a cross-shaped structure. A connecting plate 102 is installed on one surface of both left and right ends of the fixed plate 101. A first cylinder 103 is installed on one end of the connecting plate 102. A limiting roller 104 is installed between the other ends of two adjacent connecting plates 102. A roller shaft 105 is installed between one surface of both left and right ends of two adjacent fixed plates 101. A clamping roller group 106 is installed between the upper and lower ends of the two adjacent fixed plates 101.

[0083] The winding section 4 includes a double-station winding device 40;

[0084] The double-station winding device 40 and the double-station unwinding device 10 are arranged in a mirror image structure.

[0085] By providing a double-station winding device 40 and a double-station unwinding device 10, the label paper can be quickly wound and unwound. When one of the rollers 105 is operating, the other roller can be installed for standby, saving the time required for replacement and improving replacement efficiency.

[0086] Furthermore, the front printing scraper tool 5 comprises a plate roller 51 and a pressure roller, and the plate roller 51 and the pressure roller are used in pairs; a relief plate 510 is provided on the plate roller 51, and two end protection devices 511 are fixedly connected to the outer surface of the plate roller 51 near the end;

[0087] The end protection device 511 protrudes outward, and the protrusion height is between the height of the plate roller 51 body and the relief plate 510;

[0088] The plate roller 51 is independently controlled by an independent servo motor. Similarly, the reverse printing scraper 7 is also provided with a corresponding plate roller (not shown in the figure), which is also independently controlled by a servo motor.

[0089] Further, both the front printing unit and the back printing unit include a plurality of electronic marking devices;

[0090] The electronic alignment device of the front printing part is arranged on a guide roller 601. There are multiple guide rollers 601, which are respectively arranged in front of the front printing scraper tooling 5, behind the front printing scraper tooling 5 and in front of the front ink curing tooling 6;

[0091] The electronic marking device of the reverse printing part is arranged in a mirror-symmetrical manner with the electronic marking device 60 of the front printing part.

[0092] The electronic marking device finds that the plate roller 51 of the front-side printing scraper tooling 5 and the plate roller of the back-side printing scraper tooling 7 (not marked in the figure) are not used in pairs, which causes a deviation between the front-side printing pattern and the back-side printing pattern. The electronic marking device then sends a control command to the servo motor to adjust the rotation speed or "stagnation" of the plate roller 51, so that the plate roller 51 of the front-side printing scraper tooling 5 and the plate roller of the back-side printing scraper tooling 7 (not marked in the figure) rotate synchronously.

[0093] Furthermore, the front printing glue scraping tool 5 also includes a scraper tool 50 , which is adjacent to the plate roller 51 , and the scraper tool 50 includes a horizontal adjustment component, a height adjustment component, an angle adjustment component and a scraper 504 .

[0094] Further, the angle adjustment assembly includes a worm gear set 503 and a fourth cylinder 501;

[0095] The worm gear set 503 is provided with a polished rod 506, and the polished rod 506 can rotate around the axis as the worm gear set 503 moves;

[0096] One end of the fourth cylinder 501 is extended and fixedly connected to the polished rod 506, and the other end is hinged to the horizontal adjustment assembly, the horizontal adjustment assembly is sleeved with the polished rod 506, and the scraper 504 is located at one end of the horizontal adjustment assembly;

[0097] The angle adjustment assembly can control the scraper 504 to rotate along the lead screw 509;

[0098] One end of the height adjustment component is sleeved on the polished rod 506 , and the other end is fixed to the bottom of the front printing scraper tooling 5 .

[0099] Further, the horizontal adjustment assembly includes a hand wheel 507, a lead screw 509 and a sliding member 505, and the hand wheel 507 can control the scraper 504 to move horizontally;

[0100] The height adjustment assembly includes a plurality of fifth cylinders 502 , and the fifth cylinders 502 can control the scraper 504 to move horizontally.

[0101] Specifically, the worm gear set 503 and the fourth cylinder 501 are used in combination. When the angle needs to be adjusted, the fourth cylinder 501 is adjusted first for rough adjustment, and then the worm gear set 503 is finely adjusted, mainly so that the angle adjustment range is more precise.

[0102] Furthermore, the front ink curing tool 6 is provided with 3-6 groups of UV lamps 61, each group of UV lamps 61 is composed of 2-5 UV lamp tubes, and one side of each group of UV lamps 61 is also provided with fans 62 equal to the number of the lamp groups, and any lamp tube is connected to the fan 62 through an independent air duct, and the fan 62 is used to extract the smoke generated by curing in the lampshade of the UV lamp 61; any fan 62 is independently controlled;

[0103] The reverse ink curing tooling 8 and the front ink curing tooling 6 are arranged in a mirror-image structure.

[0104] Further, the front ink curing tool 6 is provided with three groups of UV lamps 61, and the temperatures of each group of UV lamps 61 from the feeding direction to the discharging direction are T0°C, T0-(0-5)°C, and T0-(5-10)°C;

[0105] The reverse ink curing tool 8 is provided with three groups of UV lamps 61, and the temperatures of each group of UV lamps 61 from the feeding direction to the discharging direction are T1°C, T1-(0-5)°C, and T1-(5-10)°C, respectively.

[0106] Furthermore, each group of UV lamps 61 has the same power, and the temperature of each group of UV lamps 61 is controlled by air supply and / or exhaust by the fan 62 .

[0107] Furthermore, a corona treatment device 9 is provided between the first tensioning portion 2 and the front printing portion, and between the front printing portion and the back printing portion.

[0108] Furthermore, the first tensioning part 2 also includes a deviation correction guide tooling 21; the deviation correction guide tooling 21 is provided with two independently controlled sixth cylinders, one end of the sixth cylinder is hinged to the first tensioning part 2, and the other end is hinged to the deviation correction guide roller.

[0109] Furthermore, a universal joint is provided on the end of the sixth cylinder close to the deviation-correcting guide roller.

[0110] Furthermore, the number of the deviation-correcting guide fixtures 21 in the first tensioning portion 2 is 4-6.

[0111] During use: the printing paper is sent outward from the roller 105 close to the automatic material receiving device 20, and the limiting roller 104 on the roller 105 plays a guiding and limiting role; then, the printing paper enters the unwinding automatic material receiving device 20 of the first tensioning part 2, and the unwinding automatic material receiving device 20 only has the auxiliary roller 205 to play a guiding transmission role, and then the printing paper enters the deviation correction guide tooling 21 of the first tensioning part 2. The deviation correction guide tooling 21 has several groups (specifically, it can be 4 groups, 5 groups or 6 groups). The built-in pressure sensor can sense whether the printing paper is deviated. The universal joint 213 is used to correct the traveling direction of the printing paper. Of course, the first tensioning part 2 also includes several fixed rollers.

[0112] Subsequently, the front side of the printed paper stock enters the corona treatment device 9 to increase the surface tension in preparation for front side printing.

[0113] Then, the printing paper passes through several fixed guide rollers and enters the front printing section, first passing between the plate roller 51 and the pressure roller. The plate roller 51 is provided with an end protection device 511, which is mainly used to improve stability and dissipate heat. A scraper tool 50 is provided under the plate roller 51. Because the plate roller 51 can be replaced, its diameter will change, and the position of the scraper will change accordingly. Therefore, the scraper tool 50 is required to have the ability to adjust the horizontal, height, and rotation. Therefore, a horizontal adjustment component, a height adjustment component, and an angle adjustment component are configured.

[0114] The printed paper material after front printing enters the front ink curing tooling 6, which is provided with 3 groups of UV lamps 61. The temperatures of each group of UV lamps 61 from the feeding direction to the discharging direction are 200°C, 195°C, and 190°C, respectively. Of course, the curing temperature can be adjusted, specifically by connecting the fan 62 with the independent air duct of the UV lamp tube. The fan 62 is independently controlled, so that the air volume of each group of UV lamps 61 can be adjusted, thereby adjusting the temperature;

[0115] Subsequently, the cured printing paper enters the second corona treatment device 9 to increase the surface tension in preparation for reverse printing; then, the printing paper passes through a number of fixed guide rollers and enters the reverse printing section; the reverse printing section has the same process as the front printing section, and the structure is mirror-symmetrical. Of course, the mirror-symmetrical arrangement of the structure described in the present invention does not mean absolute symmetry along a certain center line, but a structural symmetrical layout that achieves its function.

[0116] Subsequently, the printed paper enters the second tensioning section 3 and then enters the winding section 4 .

[0117] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A double-sided printing machine, characterized in that: It comprises an unwinding section (1), a first tensioning section (2), a front printing section, a back printing section, a second tensioning section (3) and a winding section (4) which are arranged in sequence from feeding to discharging; The front printing section comprises a front printing scraper tool (5) and a front ink curing tool (6); the back printing section comprises a back printing scraper tool (7) and a back ink curing tool (8); The unwinding portion (1) and the rewinding portion (4) are arranged in a mirror-symmetrical manner; The front side printing and scraping tool (5) and the back side printing and scraping tool (7) are arranged in a mirror-image symmetric manner; The first tensioning portion (2) and the second tensioning portion (3) are arranged in a mirror-symmetrical manner; The front ink curing tool (6) and the back ink curing tool (8) are arranged in a mirror-symmetrical manner; The first tensioning portion (2) comprises an automatic unwinding material receiving device (20), and the automatic unwinding material receiving device (20) corresponds to the unwinding portion (1); The second tensioning portion (3) comprises an automatic winding material receiving device (30), and the automatic winding material receiving device (30) corresponds to the winding portion (4); The inner surface of the automatic unwinding material receiving device (20) is provided with a sleeve plate (207) and a third cylinder (206); one end of the third cylinder (206) is hinged to the sleeve plate (207), and the other end is connected to the automatic unwinding material receiving device (20); the sleeve plate (207) is slidably connected to the automatic unwinding material receiving device (20) via a slideway, and the sleeve plate (207) can move horizontally along the slideway; The inner surface of the sleeve plate (207) is provided with a hinge plate (201) and a second cylinder (203); an auxiliary roller (205) is installed between the two sleeve plates (207); and a support roller (202) is installed between the two hinge plates (201); one end of the second cylinder (203) is connected to the hinge plate (201), and the other end is connected to the sleeve plate (207); A cutting knife (204) is installed between the two hinged plates (201), and the cutting knife (204) is far away from the second cylinder (203); The unwinding automatic material receiving device (20) and the rewinding automatic material receiving device (30) are arranged in a mirror image structure; The unwinding section (1) comprises a double-station unwinding device (10); The double-station unwinding device (10) comprises a fixed plate (101), the fixed plate (101) is a cross-shaped structure, a connecting plate (102) is installed on a surface at both ends of the fixed plate (101), a first cylinder (103) is installed on one end of the connecting plate (102), a limiting roller (104) is installed between the other ends of two adjacent connecting plates (102), a roller shaft (105) is installed between a surface at both ends of the two adjacent fixed plates (101), and a clamping roller group (106) is installed between the upper and lower ends of the two adjacent fixed plates (101); The winding section (4) comprises a double-station winding device (40); The double-station winding device (40) and the double-station unwinding device (10) are arranged in a mirror image structure; The front printing scraper tool (5) comprises a plate roller (51) and a pressure roller, and the plate roller (51) and the pressure roller are used in pairs; The plate roller (51) is provided with a relief plate (510), and the outer surface of the plate roller (51) near the end is fixedly connected with two end protection devices (511); The end protection device (511) protrudes outward, and the protrusion height is between the height of the plate roller (51) body and the relief plate (510); The plate roller (51) is independently controlled by an independent servo motor; The front printing unit and the back printing unit both include a plurality of electronic marking devices; The electronic alignment device of the front printing part is arranged on a guide roller (601), and the guide roller (601) is multiple and is respectively arranged in front of the front printing scraper tooling (5), behind the front printing scraper tooling (5) and in front of the front ink curing tooling (6); The electronic marking device of the reverse printing part is arranged in mirror symmetry with the electronic marking device of the front printing part; The front ink curing tooling (6) is provided with 3-6 groups of UV lamps (61), each group of the UV lamps (61) is provided with 2-5 UV lamp tubes, and one side of each group of the UV lamps (61) is also provided with fans (62) equal in number to the number of the lamp groups, and any of the lamp tubes is connected to the fans (62) through an independent air duct, and the fans (62) are used to extract the smoke generated by curing in the lampshade of the UV lamp (61); any of the fans (62) is independently controlled; The reverse ink curing tooling (8) and the front ink curing tooling (6) are arranged in a mirror-image structure; A corona treatment device (9) is provided between the first tensioning portion (2) and the front printing portion, and between the front printing portion and the back printing portion; The first tensioning part (2) further comprises a deviation correction guide tooling (21); the deviation correction guide tooling (21) is provided with two independently controlled sixth cylinders, one end of the sixth cylinder is hinged to the first tensioning part (2), and the other end is hinged to the deviation correction guide roller.

2. A double-sided printing machine according to claim 1, characterized in that: The front printing scraper tool (5) further comprises a scraper tool (50), wherein the scraper tool (50) is adjacent to the plate roller (51), and the scraper tool (50) comprises a horizontal adjustment component, a height adjustment component, an angle adjustment component and a scraper (504).

3. A double-sided printing machine according to claim 2, characterized in that: The angle adjustment assembly comprises a worm gear set (503) and a fourth cylinder (501); The worm gear set (503) is provided with a polished rod (506), and the polished rod (506) can rotate around the axis as the worm gear set (503) moves; One end of the fourth cylinder (501) is extended and fixedly connected to the polished rod (506), and the other end is hinged to the horizontal adjustment component, the horizontal adjustment component is sleeved with the polished rod (506), and the scraper (504) is located at one end of the horizontal adjustment component; The angle adjustment assembly can control the scraper (504) to rotate along the lead screw (509); One end of the height adjustment component is sleeved on the polished rod (506), and the other end is fixed to the bottom of the front printing scraper tooling (5).

4. A double-sided printing machine according to claim 3, characterized in that: The horizontal adjustment assembly comprises a hand wheel (507), a lead screw (509) and a sliding member (505), and the hand wheel (507) can control the scraper (504) to move horizontally; The height adjustment assembly includes a plurality of fifth cylinders (502), and the fifth cylinders (502) can control the scraper (504) to move horizontally.

5. A double-sided printing machine according to claim 1, characterized in that: The front ink curing tool (6) is provided with three groups of UV lamps (61), and the temperatures of each group of UV lamps (61) are T0°C, T0-(0-5)°C, and T0-(5-10)°C in the direction from the feed to the discharge. The reverse ink curing tool (8) is provided with three groups of UV lamps (61), and the temperatures of each group of UV lamps (61) from the feeding direction to the discharging direction are T1°C, T1-(0-5)°C, and T1-(5-10)°C, respectively.

6. A double-sided printing machine according to claim 5, characterized in that: The power of each group of UV lamps (61) is the same, and the temperature of each group of UV lamps (61) is controlled by air supply and / or exhaust of a fan (62).

7. A double-sided printing machine according to claim 1, characterized in that: A universal joint is also provided on the end of any of the sixth cylinders close to the deviation-correcting guide roller.

8. A double-sided printing machine according to claim 1, characterized in that: The number of the deviation-correcting guide tooling (21) in the first tensioning portion (2) is 4 to 6 groups.

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