CN114953710A

CN114953710A - Flexographic printing machine

Info

Publication number: CN114953710A
Application number: CN202210519528.4A
Authority: CN
Inventors: 上伟; 崔海洋; 王凯; 翟微波; 孙洪波; 陈俊茹
Original assignee: Shaanxi Jinye Printing Co ltd; Shenzhen Ruifeng New Material Technology Group Co ltd; Shaanxi Yanyin Packaging Technology Co ltd
Current assignee: Shaanxi Jinye Printing Co ltd; Shenzhen Ruifeng New Material Technology Group Co ltd; Shaanxi Yanyin Packaging Technology Co ltd
Priority date: 2022-05-13
Filing date: 2022-05-13
Publication date: 2022-08-30
Anticipated expiration: 2042-05-13
Also published as: CN114953710B

Abstract

The application relates to a flexographic printing machine, which comprises a mounting rack, an unreeling part, a reeling part, a tensioning part and a plurality of groups of printing units which are linearly arranged, wherein the unreeling part and the reeling part are respectively arranged at two ends of each printing unit; the printing unit comprises a printing roller, an ink supply roller and a supporting roller which are synchronously and rotatably connected to the mounting frame, the ink supply roller is arranged above the printing roller, and the supporting roller is arranged below the printing roller; the tensioning component comprises at least two groups of clamping plates and driving parts, and the clamping plates are uniformly arranged on two sides of the printing roller along the feeding direction; each group of clamping plates is provided with two clamping plates and is connected on the mounting frame in a sliding way along the feeding direction; the clamping plates are parallel to the printing roller, the coiled material passes through the clamping plates in the same group and passes through the printing roller and the supporting roller, and the clamping plates are arranged between two positions of the coiled material to be printed; the driving piece can enable the two clamping plates to be close to each other and tightly abut against the coil stock, and the clamping plates can slide. The application has the effect of improving the printing quality.

Description

Flexographic printing machine

Technical Field

The application relates to the field of printing equipment, in particular to a flexographic printing machine.

Background

The flexible plate printing machine is a printing equipment, mainly consists of unwinding feeding component, printing component, drying component and rewinding receiving component, and utilizes the fluid ink with strong flowability to transfer the ink from ink fountain rubber roller and anilox ink-transferring roller to the image-text portion of printing plate and make it implement inking, then utilizes the press roller to apply printing pressure to transfer the ink on the printing plate to the printing stock so as to implement printing of printing stock.

Chinese patent with application number CN201911023487.4 discloses a high-speed flexographic printing machine and a control system, which comprises a mounting plate, wherein a winding motor is mounted on one side inside the mounting plate, the output end of the winding motor is connected with a driving disc, the outer side of the driving disc is connected with a connecting shaft, a winding roller is arranged on the outer side of the connecting shaft, one side of the driving disc is connected with a driven disc through a belt, one side of the driven disc is connected with the winding roller, a rotating motor is mounted at the bottom end inside the mounting plate, and the output end of the rotating motor is connected with a second driving disc; the inside of mounting panel is located the rear side of rotating electrical machines and installs the cylinder, and the output of cylinder installs adjusting motor, and adjusting motor's output is connected with the dancer roll.

When printing, the installation of paper reel first carries out, has the outside of the reel installation winding up roller of paper, does not have the outside of installing at the wind-up roller of paper to the debugging, later starts the rolling motor, drives winding up roller and wind-up roller synchronous rotation, thereby makes the stock begin to move, prints, through cylinder, accommodate motor, regulating roller, can carry out the rate of tension to the paper through the position of adjustment regulating roller and adjust.

In view of the above related technologies, the inventor believes that a plurality of groups of printing units are arranged between a winding roller and a wind-up roller of a unit type flexographic printing machine, a printing path is long, and when a printing stock which is easy to stretch is encountered, the printing stock needs a larger tension force to be tensioned under the action of gravity, so that the conditions of stretching, color misregistration and pattern deformation of the printing stock can be caused.

Disclosure of Invention

In order to improve printing quality, the application provides a flexographic printing machine.

The application provides a flexographic printing machine adopts following technical scheme:

a flexographic printing machine comprises a mounting rack, an unwinding part, a winding part and a plurality of groups of printing units which are linearly arranged, wherein the unwinding part and the winding part are arranged at two ends of each printing unit respectively; the printing unit comprises a printing roller, an ink supply roller and a supporting roller which are synchronously and rotatably connected to the mounting frame, the ink supply roller is arranged above the printing roller, and the supporting roller is arranged below the printing roller; the tensioning component comprises at least two groups of clamping plates and driving parts, and the clamping plates are uniformly arranged on two sides of the printing roller along the feeding direction; two clamping plates are arranged in each group and are connected to the mounting frame in a sliding mode along the feeding direction; the clamping plates are parallel to the printing roller, the coiled material passes through the clamping plates in the same group and passes through the printing roller and the supporting roller, and the clamping plates are arranged between two positions to be printed of the coiled material; the driving piece can enable the two clamping plates to be close to each other and tightly abut against the coiled material, and the clamping plates can slide.

By adopting the technical scheme, when printing is carried out, the winding drum with the coiled material is arranged at the unwinding end through the unwinding part, the winding drum without the coiled material is arranged at the winding end, and the coiled material is tightened; then adjusting the two clamping plates to be close to each other and clamped at two sides of the coil material through the driving part and tightly abut against the coil material, then starting printing, gradually moving the coil material, driving the clamping plates and the coil material to move forwards simultaneously through the driving part until the coil material reaches a printing roller, immediately adjusting the clamping plates to be far away from the coil material through the driving part and resetting, then clamping and feeding the next section of coil material, and starting printing processing after debugging is finished; the mounting frame, the unreeling part, the printing unit and the reeling part are arranged, the material discharging, printing and material receiving of the coil stock are connected into a whole, and the coil stock can be printed for multiple times at one time; the arranged clamping plates and the driving piece can divide the coil stock between the unreeling and the reeling into a plurality of independent sections according to the number of the printing units, and force is applied to the coil stock at the corresponding printing unit positions through the clamping plates, so that the coil stock between the two groups of clamping plates is in a relatively static state, the condition of stretching deformation of the coil stock due to overlarge tension force is reduced, and the printing quality is ensured; meanwhile, the positions of the clamping plates of the printing units are the same, and the clamping positions of the clamping plates are the same, so that the color register effect of multiple printing can be ensured, and the printing effect is improved.

Optionally, the driving piece is including setting up die clamping cylinder and slide cylinder on the mounting bracket, slide cylinder sets up on the mounting bracket, just slide cylinder's piston rod is parallel with the pay-off direction, die clamping cylinder sets up slide cylinder one end, and corresponds two die clamping cylinder's piston rod one end sets up relatively, splint set up die clamping cylinder's piston rod one end.

Through adopting above-mentioned technical scheme, the centre gripping cylinder and the slip cylinder that set up, through the piston rod flexible drive splint that mutually support directly through the cylinder close to the centre gripping coil stock, drive splint and coil stock simultaneous movement mutually, realize centre gripping and synchronous motion to the coil stock.

Optionally, the mounting frame is provided with a first chute and a second chute which are sequentially communicated, the first chute is perpendicular to the coil stock, and the second chute is flush with the coil stock; the two ends of the clamping plate are rotatably connected with pulleys, and the pulleys extend into the first sliding groove and the second sliding groove and rotate.

Through adopting above-mentioned technical scheme, the operating position and the traffic direction of splint are restricted to first spout and the second spout that set up, reduce rocking of splint, lead to the motion of splint, and then make the stability of splint and coil stock motion.

Optionally, the tensioning part further comprises a tensioning roller and a lifting cylinder, wherein the tensioning roller is parallel to the printing roller and is supported below the coil stock; the lifting cylinder is arranged on the mounting frame, a piston rod of the lifting cylinder is vertical, and the tensioning roller is arranged at one end of the piston rod of the lifting cylinder and drives the coil stock to lift.

Through adopting above-mentioned technical scheme, the tensioning roller and the lift cylinder that set up, the piston rod of lift cylinder drives the tensioning roller and rises, and then drives the coil stock between two printing units and rises, realizes the tensioning, does not influence the printing work of both sides printing unit simultaneously.

Optionally, the tension roller is disposed above the printing roller.

Through adopting above-mentioned technical scheme, the tensioning roller sets up in printing roller top, and the coil stock falls under the action of gravity, and the coil stock of being convenient for hangs down naturally, carries out the tensioning again for the coil stock is more level and smooth.

Optionally, the unwinding part comprises a winding roller, and two groups of winding frames and a feeding cylinder which are respectively arranged at two ends of the winding roller, the winding frames are hinged on the mounting frame, one end of each winding frame, which is far away from the mounting frame, is provided with a clamping groove, and two ends of each winding roller extend into the clamping grooves; one end of the feeding cylinder is hinged to the mounting frame, the other end of the feeding cylinder is hinged to the rolling frame, and hinged shafts of the rolling frame and the feeding cylinder are parallel to the rolling roller; the winding part and the unwinding part are arranged in the same structure.

By adopting the technical scheme, when feeding is carried out, the feeding cylinder is started, the piston rod of the feeding cylinder is gradually retracted into the cylinder body, the winding frame is further driven to rotate towards one end away from the winding part, so that the clamping groove of the winding frame gradually tends to be horizontal, then the two ends of the winding roller are installed on the inner wall of the clamping groove, the winding roller is erected, the piston rod of the feeding cylinder is started to reset, the winding frame is driven to rotate until the notch of the clamping groove faces upwards, and feeding is finished; the winding up roller, the roll frame and the material loading cylinder that set up carry on spacingly and support to the winding up roller through the draw-in groove, support and drive the roll frame through the material loading cylinder, can fast loading and unloading coil stock, and the high-efficient material loading and unloading of being convenient for reduce the gravitational potential energy that the workman need overcome, raise the efficiency, labour saving and time saving.

Optionally, the winding roller sequentially comprises a coiling section, a bearing section and a lengthening section from the middle to two ends along the axial direction, and the bearing section is arranged on the inner wall of the clamping groove; limiting grooves are symmetrically formed in the coil section, limiting cards are connected in the limiting grooves in a sliding mode, and the coil is arranged between the limiting cards; the limiting groove is internally provided with a limiting spring, and the limiting spring can enable the limiting card to move towards the direction extending out of the limiting groove.

By adopting the technical scheme, the material rolling section is used for carrying out material rolling, and the position of the material rolling is further limited by the limit card, so that the material rolling is more orderly, and the printing quality is improved; the rolling roller is prevented from separating from the rolling frame through the lengthened section, and the safety is improved.

Optionally, the winding part is provided with the receipts material frame and evenly rotates to be connected near printing unit one side and is in receiving the live-rollers on the material frame, live-rollers and winding up roller parallel arrangement, and the coil stock is around establishing on the live-rollers.

Through adopting above-mentioned technical scheme, the receipts material frame and the live-rollers that set up, the coil stock is around establishing on the live-rollers along "S" type, can arrange the coil stock that the printing was accomplished when receiving the material in order for the coil stock is gently orderly receives the material.

Optionally, the printing unit further includes two drying rollers corresponding to any one of the printing units, and the drying rollers are disposed on one discharging side of the printing roller and on two sides of the coil stock; the drying roller is hollow and is provided with a plurality of air outlets, and one end of the drying roller is used for introducing hot air.

Through adopting above-mentioned technical scheme, the stoving roller of setting, the coil stock is playing partial printing back, and hot-blast air-blowing is to the coil stock along the air outlet, carries out fast drying to the printing ink on the coil stock, and the coil stock of being convenient for is carrying out the in-process of next unit stoving drier more, carries out next printing, reduces the dyeing or the situation of smearing dirty.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the arranged clamping plates and the driving pieces can divide the coiled material between unreeling and reeling into a plurality of independent sections according to the number of the printing units, and force is applied to the coiled material corresponding to the positions of the printing units through the clamping plates, so that the coiled material between the two groups of clamping plates is in a relatively static state, the condition of stretching deformation of the coiled material due to overlarge tension force is reduced, and the printing quality is guaranteed; meanwhile, the positions of the clamping plates of the printing units are the same, and the clamping positions of the clamping plates are the same, so that the color register effect of multiple printing can be ensured, and the printing effect is improved;

2. the tensioning roller and the lift cylinder that set up, the piston rod of lift cylinder drive the tensioning roller and rise, and then drive the coil stock between two printing unit and rise, realize the tensioning, do not influence the printing work of both sides printing unit simultaneously.

3. The winding up roller, the roll frame and the material loading cylinder that set up carry on spacingly and support to the winding up roller through the draw-in groove, support and drive the roll frame through the material loading cylinder, can fast loading and unloading coil stock, and the high-efficient material loading and unloading of being convenient for reduce the gravitational potential energy that the workman need overcome, raise the efficiency, labour saving and time saving.

Drawings

Fig. 1 is a schematic view of the overall structure of a flexographic printing machine according to an embodiment of the present application.

Fig. 2 is an internal schematic view of the mount of fig. 1.

Fig. 3 is an enlarged view of a portion a in fig. 1.

Fig. 4 is a schematic structural diagram of the material receiving frame in fig. 1.

Fig. 5 is an enlarged view of a portion B in fig. 2.

Description of reference numerals: 1. a mounting frame; 11. a base plate; 12. mounting a plate; 13. inserting slots; 2. an unwinding part; 21. a winding roller; 211. a material coiling section; 212. a bearing section; 213. a lengthening section; 214. a limiting card; 22. rolling a rack; 221. a card slot; 23. a feeding cylinder; 24. a servo motor; 25. a clamping cylinder; 26. inserting plates; 3. a winding component; 31. a material receiving frame; 32. a rotating roller; 33. a limiting ring; 34. positioning the bolt; 4. a tension member; 41. a tension roller; 42. a lifting cylinder; 43. a splint; 44. a clamping cylinder; 45. a slide cylinder; 46. a first chute; 47. a second chute; 5. a printing unit; 51. a drying roller; 52. a lower pressing roller; 53. a printing roller; 54. an ink supply roller; 55. and (4) supporting the roller.

Detailed Description

The present application is described in further detail below with reference to figures 1-5.

The embodiment of the application discloses a flexographic printing machine. Referring to fig. 1 and 2, the flexographic printing machine comprises an installation frame 1, an unreeling part 2, a reeling part 3, a tensioning part 4 and a plurality of groups of printing units 5 which are linearly arranged, wherein the installation frame 1 comprises a bottom plate 11 and two groups of installation plates 12 which are welded on the bottom plate 11 in parallel, the bottom plate 11 is fixed on a supporting surface through foundation bolts, and the unreeling part 2 and the reeling part 3 are arranged on the installation frame 1 and are respectively arranged at two ends of the printing units 5 and used for unreeling and receiving coiled materials; the tension member 4 is provided in the printing unit 5; the plurality of sets of printing units 5 print the web.

Referring to fig. 1 and 3, the unwinding component 2 includes a winding roller 21, a winding frame 22, a feeding cylinder 23, a servo motor 24 and a clamping member, two groups of winding frames 22 and feeding cylinders 23 are provided, one ends of the two winding frames 22 are respectively hinged to the two mounting plates 12, one end of each winding frame 22, which is far away from the mounting plates 12, is provided with a clamping groove 221, and one end of each clamping groove 221, which is far away from the hinge shaft, is provided with a clamping groove 221; the winding roller 21 sequentially comprises a winding section 211, a bearing section 212 and an extension section 213 from the middle to two ends along the axial direction, two ends of the winding roller 21 penetrate through the clamping groove 221, the bearing section 212 is erected on the inner wall of the clamping groove 221, and the extension section 213 extends out of the clamping groove 221; one end of a piston rod of the feeding cylinder 23 is hinged on the mounting frame 1, the cylinder body passes through the rolling frame 22 and is hinged on the rolling frame 22, and a hinged shaft of the rolling frame 22 and the feeding cylinder 23 is parallel to the rolling roller 21. The mounting plate 12 is provided with a horizontal slot 13, the slot 13 is connected with a plug board 26 in a sliding manner, the servo motor 24 is fixed on the plug board 26 through a servo bolt, an output shaft of the servo motor 24 is a hexagonal prism, and the lengthened section 213 is correspondingly and coaxially provided with a hexagonal sunk groove.

Referring to fig. 3, the roll material section 211 is symmetrically provided with two limiting grooves about the midpoint, and two limiting grooves in the same radial direction are uniformly arranged along the circumferential direction of the roll material section 211; spacing inslot welding has spacing spring, and spacing spring is in compression state, and one end and spacing inslot wall welding, and the other end welding has spacing card 214, and spacing card 214 one end card is established at spacing inslot, the other end stretch out the spacing groove and with spacing groove sliding connection, spacing spring can make spacing card 214 tend to stretch out the spacing groove.

Referring to fig. 3, the clamping member is a clamping cylinder 25, the clamping cylinder 25 is fixed on the roll frame 22 by bolts, a piston rod of the clamping cylinder 25 is perpendicular to the roll frame 22 and passes through the roll frame 22 to extend into the clamping groove 221, and the bearing section 212 is located in a space defined by the bottom wall of the clamping groove 221, the peripheral side wall and the piston rod of the clamping cylinder 25, so as to prevent the roll 21 from being separated from the opening of the clamping groove 221.

Referring to fig. 3 and 4, the winding part 3 and the unwinding part 2 are arranged in the same structure, a material receiving frame 31 and four rotating rollers 32 which are uniformly and rotatably connected to the material receiving frame 31 are arranged on one side of the winding part 3 close to the printing unit 5, the rotating rollers 32 are parallel to the winding roller 21, and the winding material is wound on the rotating rollers 32 along an S shape. Two limiting rings 33 are connected on the two rotating rollers 32 of the coiled material below the rotating rollers 32 in a sliding mode, the coiled material is limited between the coiled material and the two limiting rings 33, positioning bolts 34 are connected on the limiting rings 33 through bolts, and the positioning bolts 34 are perpendicular to the rotating shaft and are tightly abutted to the rotating rollers 32.

Referring to fig. 5, the printing unit 5 includes a drying roller 51, a pressing roller 52, and a printing roller 53, an ink supplying roller 54 and a supporting roller 55 rotatably connected to the mounting frame 1 in synchronization, the ink supplying roller 54 being disposed above the printing roller 53 for filling ink to the printing plate on the printing roller 53. The support roller 55 is disposed below the printing roller 53, and supports the web to facilitate printing by the printing roller 53. The lower press roller 52 is rotatably connected to the mounting plate 12 and is arranged on the feeding side of the printing roller 53, and the roll material enters the printing roller 53 along the lower portion of the lower press roller 52, so that the roll material is conveniently attached to the printing roller 53 fully.

Referring to fig. 5, two drying rollers 51 are arranged corresponding to any one printing unit 5, the drying rollers 51 are parallel to the printing roller 53 and are rotatably connected to the mounting plate 12, the drying rollers 51 are arranged on the discharging side of the printing roller 53, the two drying rollers 51 are simultaneously arranged on the upper side and the lower side of the coil stock, and a drying seam exists between the two drying rollers 51 and the coil stock; the drying roller 51 is hollow, one end of the drying roller is used for introducing hot air, a plurality of air outlets communicated with the hollow cavity are formed in the peripheral side of the drying roller 51, and the printed coil stock is dried.

Referring to fig. 2 and 5, the tension member 4 includes a tension roller 41, a lifting cylinder 42, and two sets of clamping plates 43 and a driving member including a clamping cylinder 44 and a sliding cylinder 45; the two groups of clamping plates 43 are respectively arranged on two sides of the printing roller 53 along the feeding direction; two clamping plates 43 are arranged in each group, and the clamping plates 43 are parallel to the coil stock and are distributed on two sides of the coil stock; the clamping plate 43 is arranged between two positions to be printed of the coiled material, and a cushion layer is arranged on one side, close to the coiled material, of the clamping plate 43 to protect the coiled material; the sliding cylinder 45 is fixed on the mounting plate 12 through a bolt, a piston rod of the sliding cylinder 45 is parallel to the coil stock, the clamping cylinder 44 is fixed at one end of the piston rod of the sliding cylinder 45 through a bolt and is oppositely arranged corresponding to one end of the piston rod of the two clamping cylinders 44, and the clamping plate 43 is fixed at one end of the piston rod of the clamping cylinder 44 through a bolt.

Referring to fig. 5, a first chute 46 and a second chute 47 which are sequentially communicated are formed in the mounting plate 12, the first chute 46 is perpendicular to the coil stock, and the second chute 47 is flush with the coil stock; the two ends of the clamping plate 43 are rotatably connected with pulleys, and the pulleys extend into the first sliding groove 46 and the second sliding groove 47 and rotate to realize sliding connection with the first sliding groove 46 and the second sliding groove 47.

With reference to fig. 5, a tensioning roller 41 is arranged between the two printing units 5, the tensioning roller 41 being parallel to the printing roller 53 and higher than the printing roller 53, the tensioning roller 41 being supported below the web; lifting cylinder 42 passes through the bolt fastening on mounting panel 12, and lifting cylinder 42's piston rod is vertical, and tensioning roller 41 sets up in lifting cylinder 42's piston rod one end to drive the coil stock and go up and down.

The implementation principle of the flexographic printing machine in the embodiment of the application is as follows: when printing, loading: starting the feeding cylinder 23, gradually withdrawing the piston rod of the feeding cylinder 23 into the cylinder body, further driving the winding frame 22 to rotate towards one end away from the winding part 3, so that the clamping groove 221 of the winding frame 22 gradually tends to be horizontal, then installing the two ends of the winding roller 21 on the inner wall of the clamping groove 221, erecting the winding roller 21, starting the piston rod of the feeding cylinder 23 to reset, and driving the winding frame 22 to rotate until the notch of the clamping groove 221 faces upwards; then, the clamping cylinder 25 is started, so that a piston rod of the clamping cylinder 25 extends into the clamping groove 221 to limit the square winding roller; then, the inserting plate 26 is inserted into the inserting groove 13, the piston rod of the servo motor 24 extends into the hexagonal sinking groove, the winding drum with the coil stock is installed at one unwinding end through the unwinding part 2, the winding drum without the coil stock is installed at one winding end, the servo motor 24 at one winding roller end is started, the winding roller rotates, the coil stock is driven to be tightened, and feeding is completed.

Debugging and starting printing: the clamping cylinders 44 are used for adjusting the two clamping plates 43 to be close to each other and clamped at two sides of the coil stock and tightly abut against the coil stock, then the servo motor 24 and the sliding cylinders 45 are started, the coil stock gradually moves, the sliding cylinders 45 are used for driving the clamping plates 43 and the coil stock to move forwards simultaneously until the coil stock reaches the printing rollers 53, and the coil stock is printed; adjusting the clamping plate 43 to be far away from the coil stock and reset through the driving piece, and then clamping and feeding the next section of coil stock; the coil stock after printing is finished passes through the drying roller 51, the hot air sprayed from the air outlet enables the ink on the coil stock to be quickly dried, the printing of the next printing unit 5 is carried out until the next coil stock reaches the material receiving frame 31, the last coil stock is arranged at one end of the material receiving frame, the printing process is finished, and finally the printing processing is started after the debugging is finished.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a flexographic printing machine, is in including mounting bracket (1) and setting printing unit (5) that unreel part (2), rolling part (3) and multiunit straight line on mounting bracket (1) were arranged, it sets up respectively to unreel part (2) and rolling part (3) printing unit (5) both ends, its characterized in that: also comprises a tensioning member (4) arranged between the two printing units (5);

the printing unit (5) comprises a printing roller (53), an ink supply roller (54) and a support roller (55) which are synchronously connected with the mounting frame (1) in a rotating mode, the ink supply roller (54) is arranged above the printing roller (53), and the support roller (55) is arranged below the printing roller (53);

the tensioning part (4) comprises at least two groups of clamping plates (43) and driving parts, and the clamping plates (43) are uniformly arranged on two sides of the printing roller (53) along the feeding direction; two clamping plates (43) are arranged in each group and are connected to the mounting rack (1) in a sliding manner along the feeding direction; the clamping plates (43) are parallel to the printing roller (53), the coiled material passes through the clamping plates (43) in the same group and is arranged by passing through the printing roller (53) and the supporting roller (55), and the clamping plates (43) are arranged between two positions of the coiled material to be printed;

the driving piece can enable the two clamping plates (43) to be close to each other and tightly abut against a coiled material, and can enable the clamping plates (43) to slide.

2. The flexographic printing press according to claim 1, wherein: the driving piece is including setting up centre gripping cylinder (44) and sliding cylinder (45) on mounting bracket (1), sliding cylinder (45) set up on mounting bracket (1), just sliding cylinder's (45) piston rod is parallel with the pay-off direction, centre gripping cylinder (44) set up sliding cylinder (45) one end, and correspond two the piston rod one end of centre gripping cylinder (44) sets up relatively, splint (43) set up the piston rod one end of centre gripping cylinder (44).

3. The flexographic printing press according to claim 2, wherein: a first sliding groove (46) and a second sliding groove (47) which are sequentially communicated are formed in the mounting frame (1), the first sliding groove (46) is perpendicular to the coiled material, and the second sliding groove (47) is flush with the coiled material; the two ends of the clamping plate (43) are rotatably connected with pulleys, and the pulleys extend into the first sliding groove (46) and the second sliding groove (47) and rotate.

4. The flexographic printing press according to claim 3, characterized in that: the tensioning part (4) further comprises a tensioning roller (41) and a lifting cylinder (42), wherein the tensioning roller (41) is parallel to the printing roller (53) and is supported below the coil stock; the lifting cylinder (42) is arranged on the mounting frame (1), a piston rod of the lifting cylinder (42) is vertical, and the tensioning roller (41) is arranged at one end of the piston rod of the lifting cylinder (42) and drives the coil stock to lift.

5. The flexographic printing press according to claim 4, wherein: the tension roller (41) is disposed above the printing roller (53).

6. The flexographic printing press according to claim 1, wherein: the unreeling part (2) comprises a reeling roller (21) and two groups of reeling frames (22) and a feeding cylinder (23) which are respectively arranged at two ends of the reeling roller (21), the reeling frames (22) are hinged on the mounting frame (1), one end, far away from the mounting frame (1), of each reeling frame (22) is provided with a clamping groove (221), and two ends of the reeling roller (21) extend into the clamping grooves (221); one end of the feeding cylinder (23) is hinged to the mounting frame (1), the other end of the feeding cylinder is hinged to the rolling frame (22), and hinged shafts of the rolling frame (22) and the feeding cylinder (23) are parallel to the rolling roller (21); the winding part (3) and the unwinding part (2) are arranged in the same structure.

7. The flexographic printing press according to claim 6, wherein: the winding roller (21) sequentially comprises a winding section (211), a bearing section (212) and an extension section (213) from the middle to two ends along the axial direction, and the bearing section (212) is arranged on the inner wall of the clamping groove (221); limiting grooves are symmetrically formed in the material rolling section (211), limiting clamping pieces (214) are connected in the limiting grooves in a sliding mode, and the material rolling section is arranged between the limiting clamping pieces (214); the limiting groove is internally provided with a limiting spring, and the limiting spring can enable the limiting card (214) to move towards the direction extending out of the limiting groove.

8. The flexographic printing press according to claim 6, wherein: winding part (3) are close to printing unit (5) one side and are provided with material receiving frame (31) and evenly rotate to be connected live-rollers (32) on material receiving frame (31), live-rollers (32) and winding up roller (21) parallel arrangement, and the coil stock is around establishing on live-rollers (32).

9. The flexographic printing press according to claim 1, wherein: the printing unit (5) further comprises two drying rollers (51), the two drying rollers (51) correspond to any one of the printing units (5), and the drying rollers (51) are arranged on one discharging side of the printing roller (53) and on two sides of a coil material; the drying roller (51) is hollow and is provided with a plurality of air outlets, and one end of the drying roller (51) is used for introducing hot air.