Full servo driven flexographic printing press

Abstract

The present application relates to full servo drive type flexographic printing machine, belong to printing machine technical field, through setting limit roller and limit component, when limit roller is installed on connecting roller, limit roller presses one end of limit unit, because the other end of limit unit is connected with dynamic friction piece, make dynamic friction piece remove its fit relationship with static friction piece, make printing roller rotate under the drive of rotating motor; When the connection between the limit roller and the connecting roller is loose, the limit roller will remove the pressing fit relationship with the limit unit, so that the limit unit drives the dynamic friction piece to move, realizes the fit of the dynamic friction piece and the static friction piece, realizes the emergency brake of the printing roller, solves the connection mode of the present limit block, there is a situation that the bolt on the limit block is loose in the process of rotating the printing roller, and then causes the position of one end of the printing roller to deviate in the process of rotating, so that the color overlap problem of the finished product printed out.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of printing machines, and particularly relates to a full-servo driving type flexographic printing machine. BACKGROUND

[0002] Flexographic printing is a method of printing using a flexible printing plate and transferring ink through a screen roller, which is a kind of relief printing process, and is referred to as flexographic printing. The graphic part of the flexible printing plate is raised, and during printing, the screen roller uniformly applies an ink layer of a certain thickness to the graphic part of the printing plate, and then under the action of the pressure of the impression cylinder, the ink layer of the graphic part is transferred to the surface of the printing material to form clear graphics.

[0003] For example, the utility model patent with the patent authorization announcement number CN220242705U discloses a printing roller for a flexographic printing machine, which comprises two mounting plates, mounting shafts are arranged on the opposite sides of the two mounting plates, a fixing ring is arranged between the two mounting plates, two first arc-shaped plates are connected to the left and right sides of the fixing ring, printing rollers are connected to the opposite sides of the two mounting plates, two second arc-shaped plates are connected to the opposite sides of the two printing rollers, a flexible plate is arranged on the outer side of the printing roller, and a locking assembly is arranged in the printing roller.

[0004] Based on the above patent authorization announcement search and in combination with the deficiencies in the above patent, it is found that:

[0005] The existing flexographic printing machine is provided with a printing roller with variable length at both ends and a limiting block, the limiting block is fixed on the rotating shaft through bolts and is used for limiting the position of one end of the printing roller on the rotating shaft. However, such a setting has the problem that the bolts on the limiting block are loose during the rotation of the printing roller, and then the position of one end of the printing roller is deviated during the rotation, which causes the color overlap problem of the finished product printed out. SUMMARY

[0006] In order to solve the problem that the connection mode of the existing limiting block has the problem that the bolts on the limiting block are loose during the rotation of the printing roller, and then the position of one end of the printing roller is deviated during the rotation, which causes the color overlap problem of the finished product printed out, the present application provides a full-servo driving type flexographic printing machine.

[0007] The purpose of the present application can be achieved by the following technical solutions:

[0008] The full-servo driving type flexographic printing machine comprises a connecting roller, a length-adjustable printing roller, a rotating motor, a limiting roller and a limiting assembly. The printing roller is coaxially and symmetrically arranged on the connecting roller. The rotating motor is coaxially connected to one end of the printing roller. The limiting roller is coaxially arranged at the other end of the printing roller.

[0009] The limiting component comprises a dynamic friction sheet, a static friction sheet and a limiting unit, the dynamic friction sheet and the static friction sheet are coaxially arranged in one end of the printing roller close to the limiting roller, the static friction sheet is connected with the printing roller through a connecting piece, the limiting unit is arranged in the connecting roller, two ends of the limiting unit are connected with the limiting roller and the dynamic friction sheet respectively, the limiting roller controls the sliding of the dynamic friction sheet by locking or releasing the connection between the limiting unit, and realizes the locking or releasing of the adhesion relationship between the dynamic friction sheet and the static friction sheet.

[0010] As a preferred technical scheme of the present application, the limiting unit comprises a limiting spring and a plurality of limiting rods, two ends of the limiting spring are connected with the dynamic friction sheet and one end of the printing roller close to the limiting roller respectively, the plurality of limiting rods are arranged in the connecting roller at equal angles around the central axis of the connecting roller, and further comprises a plurality of limiting shafts, the plurality of limiting shafts are matched one by one with the plurality of limiting rods, the limiting shaft is provided with a plurality of limiting notches at equal angles around the central axis thereof, the plurality of limiting notches are matched one by one with the plurality of limiting shafts, one end of the limiting shaft is slidably arranged through the corresponding limiting notch to the inner side wall of the printing roller, and the other end thereof is hingedly arranged with the middle end of the corresponding limiting rod, one end of the limiting rod is slidably arranged with the end face of the dynamic friction sheet, the sliding track of one end of the limiting rod with the end face of the dynamic friction sheet is perpendicular to the central axis of the dynamic friction sheet, and the other ends of the plurality of limiting rods can be locked or released from the mutual intersecting matching relationship, and the centers of the mutual intersection of the plurality of limiting rods are located on the central axis of the dynamic friction sheet.

[0011] As a preferred technical scheme of the present application, the limiting roller comprises an internally hollow annular roller and a plurality of pressing units, the plurality of pressing units are arranged on the annular roller at equal angles along the central axis of the annular roller, the connecting roller is provided with a plurality of connecting notches, the plurality of connecting notches are matched one by one with the plurality of limiting rods, any connecting notch is opposite to the other end of the corresponding limiting rod, the annular roller is coaxially arranged on the connecting roller, one end face of the annular roller is connected with one end face of the printing roller, the plurality of pressing units are matched one by one with the plurality of connecting notches, any pressing unit is arranged on the corresponding connecting notch, and the pressing unit is used for pressing the other end of the corresponding limiting rod.

[0012] As a preferred technical scheme of the present application, the pressing unit comprises a pressing rod, a pressing spring and an extension rod, the pressing rod is slidably arranged on the side wall of the annular roller, the sliding direction of the pressing rod is perpendicular to the central axis of the annular roller, the two ends of the pressing spring are connected to the top of the pressing rod and the outer side wall surface of the annular roller respectively, the extension rod has an extension structure, the two ends of the extension rod are connected to the bottom end of the pressing rod and the inner side wall of the annular roller respectively, the internal space of the extension rod is communicated with the internal space of the annular roller, the limiting roller further comprises a hydraulic pump and a hydraulic tank containing hydraulic oil, the hydraulic tank is communicated with the internal space of the annular roller through the hydraulic pump.

[0013] As a preferred technical scheme of the present application, the printing roller comprises coaxially arranged first and second rotating cylinders, the first and second rotating cylinders rotate synchronously and can slide relative to each other along the axial direction of the connecting roller, the extension direction of the output end of the hydraulic unit is parallel to the axial direction of the connecting roller, the output end of the hydraulic unit is connected to the rotating motor, the rotating motor is coaxially connected to the first rotating cylinder, and the end surface of the second rotating cylinder is connected to the end surface of the limiting roller.

[0014] As a preferred technical scheme of the present application, the adjusting cylinder is arranged, the extension direction of the output end of the adjusting cylinder is parallel to the axial direction of the connecting roller, and the output end of the adjusting cylinder is connected to the second rotating cylinder to drive the second rotating cylinder to slide.

[0015] As a preferred technical scheme of the present application, the pressure module is arranged in the static friction sheet, the pressure module is in communication connection with the adjusting cylinder, a plurality of connecting grooves together form a groove group, the connecting roller is provided with a plurality of groove groups, the plurality of groove groups are equidistantly arranged on the side wall of the connecting roller along the axial direction of the connecting roller, the connecting roller is further provided with a plurality of connecting grooves, the plurality of connecting grooves and the plurality of connecting grooves in a single groove group are one-to-one corresponding and matched, any connecting groove and any connecting groove of the plurality of groove groups are in communication with each other, the arrangement direction of the connecting groove is parallel to the central axis direction of the connecting roller, and the shortest distance between the connecting groove and the center of the connecting roller is less than the shortest distance between the bottom surface of the pressing rod and the center of the connecting roller when the dynamic friction sheet and the static friction sheet are attached to each other.

[0016] As a preferred technical scheme of the present application, the printing roller further comprises a plurality of transmission rods, the second rotating drum is provided with a plurality of transmission grooves at one end surface of the first rotating drum, the plurality of transmission grooves are provided on the second rotating drum at equal angles along the central axis of the second rotating drum, the central axis of the transmission grooves is parallel to the central axis of the second rotating drum, the plurality of transmission rods are matched with the plurality of transmission grooves one by one, one end of any transmission rod is connected with the end surface of the first rotating drum, and the other end is coaxially connected with the corresponding transmission groove;

[0017] The printing roller further comprises a rotating roller and a plurality of expansion units, the rotating roller is coaxially sleeved on the connecting roller, the plurality of expansion units are provided on the side wall of the rotating roller at equal angles along the central axis of the rotating roller, there is a transmission space between any two adjacent transmission rods, the plurality of transmission spaces are matched with the plurality of expansion units one by one, and any expansion unit is arranged in the corresponding transmission space.

[0018] The expansion unit comprises a plurality of expansion blocks and a plurality of expansion cylinders, the plurality of expansion blocks are matched with the plurality of expansion cylinders one by one, any expansion block is arranged at the output end of the corresponding expansion cylinder, the plurality of expansion cylinders are arranged on the side wall of the rotating roller at equal intervals along the axial direction of the rotating roller, and the two ends of any two adjacent expansion blocks are in close contact with each other.

[0019] When the expansion cylinder is extended, the distance between the surface of the expansion block and the center of the connecting roller is equal to the distance between the surface of the printing roller and the center of the connecting roller; when the expansion cylinder is retracted, the distance between the surface of the expansion block and the center of the connecting roller is smaller than the distance between the inner side wall of the printing roller and the center of the connecting roller.

[0020] As a preferred technical scheme of the present application, the printing roller further comprises two sets of limiting structures, the two sets of limiting structures are matched with the first rotating drum and the second rotating drum one by one, any limiting structure is arranged in the corresponding rotating drum, and the two limiting structures are symmetrically arranged at the two ends of the rotating roller respectively; the limiting structure comprises a plurality of limiting units, the plurality of limiting units are matched with the plurality of expansion units one by one, any limiting unit is slidingly arranged on the corresponding expansion unit, the surfaces of the plurality of expansion blocks of the same expansion unit jointly form a limiting groove, the limiting unit comprises a connecting rod and a limiting rod, the limiting rod is slidingly arranged in the corresponding limiting groove, and the two ends of the connecting rod are fixedly connected with the inner side wall of the printing roller and one end of the limiting rod respectively; when the end surface of the first rotating drum and the end surface of the second rotating drum are in close contact with each other, the two limiting rods located in the same limiting groove are in close contact with each other, and the contact position of the two limiting rods is located on the central surface of the rotating roller.

[0021] As a preferred embodiment of the present invention, the length of the limiting rod is greater than or equal to half the length of the limiting groove, the length of the limiting groove is longer than the gap length between the first rotating cylinder and the second rotating cylinder, and the width of the expansion block is equal to the spacing between two adjacent slot groups.

[0022] The beneficial effects of this invention are as follows:

[0023] This solution incorporates a limiting roller and a limiting component. When the limiting roller is installed on the connecting roller, it presses down on one end of the limiting unit. Since the other end of the limiting unit is connected to the moving friction plate, the moving friction plate releases its contact with the stationary friction plate, allowing the printing roller to rotate normally under the drive of the rotating motor. When the connection between the limiting roller and the connecting roller becomes loose, the limiting roller releases its pressing contact with the limiting unit, causing the limiting unit to drive the moving friction plate to move, thus bringing the moving friction plate into contact with the stationary friction plate and achieving emergency braking of the printing roller. This solves the problem of existing limiting block connection methods where the bolts on the limiting block loosen during the rotation of the printing roller, causing one end of the printing roller to shift during rotation and resulting in color overlap in the printed product. Attached Figure Description

[0024] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0025] Figure 1 This is a front view of the fully servo-driven flexographic printing press of the present invention;

[0026] Figure 2 This is a diagram showing the distribution of friction plates in the fully servo-driven flexographic printing press of the present invention.

[0027] Figure 3 This is a side sectional view of the limiting roller of the fully servo-driven flexographic printing press of the present invention;

[0028] Figure 4 This is a cross-sectional view of the second rotary drum and connecting roller of the fully servo-driven flexographic printing press of the present invention.

[0029] Figure 5 This is a structural diagram of the expansion unit of the fully servo-driven flexographic printing press of the present invention.

[0030] Explanation of main symbols

[0031] In the figure: 1, connecting roller; 2, printing roller; 201, first rotating drum; 202, second rotating drum; 203, transmission rod; 204, rotating roller; 3, rotating motor; 4, limiting roller; 401, annular roller; 402, pressing rod; 403, pressing spring; 404, telescopic rod; 405, hydraulic pump; 406, hydraulic tank; 5, dynamic friction plate; 6, static friction plate; 7, limiting unit; 701, limiting rod; 702, limiting spring; 8, hydraulic unit; 9, adjusting cylinder; 10, pressure module; 11, expansion unit; 1101, expansion block; 1102, expansion cylinder; 1103, limiting groove; 12, connecting rod; 13, limiting rod. DETAILED DESCRIPTION

[0032] In order to further clarify the technical means and effects adopted by the present application to achieve the predetermined object of the present application, the specific embodiments, structures, features and effects according to the present application are described in detail below in combination with the drawings and preferred embodiments.

[0033] Please refer to Figures 1-5The embodiment provides a full-servo driving type flexographic printing machine, which comprises a connecting roller 1, a length-adjustable printing roller 2, a rotating motor 3, a limiting roller 4 and a limiting assembly, the printing roller 2 is coaxially and symmetrically arranged on the connecting roller 1, the rotating motor 3 is coaxially connected with one end of the printing roller 2, and the limiting roller 4 is coaxially arranged on the other end of the printing roller 2; specifically, the limiting assembly comprises a dynamic friction plate 5, a static friction plate 6 and a limiting unit 7, the dynamic friction plate 5 and the static friction plate 6 are both coaxially arranged in one end of the printing roller 2 close to the limiting roller 4, the static friction plate 6 is connected with the printing roller 2 through a connecting piece, so that the static friction plate 6 rotates along with the rotation of the printing roller 2, the dynamic friction plate 5 is slidingly arranged on the connecting roller 1, and the dynamic friction plate 5 does not rotate, the limiting unit 7 is arranged in the connecting roller 1, two ends of the limiting unit 7 are respectively connected with the limiting roller 4 and the dynamic friction plate 5, the limiting roller 4 controls the sliding of the dynamic friction plate 5 by locking or releasing the connection between the limiting roller 4 and the limiting unit 7, and the adhesion relationship between the dynamic friction plate 5 and the static friction plate 6 is realized; it should be noted that the limiting unit 7 of the scheme is a connecting rod system, one end of the limiting unit 7 is connected with the dynamic friction plate 5, after the other end of the limiting unit 7 is locked in cooperation with the limiting roller 4, the dynamic friction plate 5 and the static friction plate 6 are separated from each other and do not adhere to each other, so that the normal rotation of the printing roller 2 is ensured; when the limiting roller 4 and the connecting roller 1 are loose, so that the limiting roller 4 no longer abuts against the other end of the limiting unit 7, the limiting unit 7 drives the dynamic friction plate 5 and the static friction plate 6 to be arranged in adhesion to each other, since the static friction plate 6 rotates together with the printing roller 2, when the dynamic friction plate 5 and the static friction plate 6 are in adhesion to each other, the rotation of the static friction plate 6 is limited, and then the emergency braking of the printing roller 2 is realized, the limiting roller 4 and the limiting unit 7 are locked in connection, and then the dynamic friction plate 5 and the static friction plate 6 are separated from each other, the rotation of the static friction plate 6 is not limited, and the printing roller 2 can normally rotate and work when the limiting roller 4 is correctly installed on the connecting roller 1 or the limiting roller 4 is installed on the connecting roller 1 without loosening; when the limiting roller 4 is incorrectly installed on the connecting roller 1 or the limiting roller 4 is installed on the connecting roller 1 and loosens, the limiting roller releases the connection with the limiting unit 7, and then the dynamic friction plate 5 and the static friction plate 6 are in adhesion to each other, the rotation of the static friction plate 6 is limited, the printing roller 2 realizes emergency braking and stops rotating, and the connection mode of the existing limiting block is solved, the screw on the limiting block loosens in the process of rotation of the printing roller 2, and then the position of one end of the printing roller 2 deviates in the process of rotation, so that the problem that the printed product has color overlap is solved.

[0034] It should be noted that the present scheme is applicable to the device of the printing roller 2 whose length can be adjusted, the two ends of the printing roller 2 can realize the change of the length through the telescopic, and the limiting roller 4 only needs one, because the rotating motor 3 is coaxially connected with one end of the printing roller 2, therefore, the position of one end of the printing roller 2 is limited by the rotating motor 3, and the limiting roller 4 is arranged at the other end of the printing roller 2, and then the position of the other end of the printing roller 2 can be limited.

[0035] Specifically, the limiting unit 7 of the present scheme comprises a limiting spring 702 and a plurality of limiting rods 701, both ends of the limiting spring 702 are connected with the dynamic friction plate 5 and the printing roller 2 respectively near one end of the limiting roller 4, the plurality of limiting rods 701 are arranged at equal angles in the connecting roller 1 around the central axis of the connecting roller 1, and further comprises a plurality of limiting shafts, the plurality of limiting shafts are matched one by one with the plurality of limiting rods 701, the connecting roller 1 is provided with a plurality of limiting notches at equal angles around the central axis thereof, the plurality of limiting notches are matched one by one with the plurality of limiting shafts, one end of the limiting shaft is slidably arranged with the inner side wall of the printing roller 2 through the corresponding limiting notch, and the other end is hingedly arranged with the middle end of the corresponding limiting rod 701, since the connecting roller 1 of the present scheme will not rotate, the limiting notch will not rotate with the corresponding limiting shaft, and the rotation of the printing roller 2 realizes the relative sliding between the limiting shaft and the inner side wall of the printing roller 2; it should be noted that the limiting rod 701 of the present scheme only rotates the angle along the middle end, and the limiting rod 701 will not rotate with the rotation of the printing roller 2, one end of the limiting rod 701 is slidably arranged with the end face of the dynamic friction plate 5, the sliding track between the one end of the limiting rod 701 and the end face of the dynamic friction plate 5 is perpendicular to the central axis of the dynamic friction plate 5, the other end of the plurality of limiting rods 701 can lock or release the mutual intersecting matching relationship, the mutual intersecting center of the plurality of limiting rods 701 is located on the central axis of the dynamic friction plate 5, it should be noted that before the limiting roller 4 is not installed on the connecting roller 1, the initial position of the limiting rod 701 is horizontally arranged in the connecting roller 1, and the central axis direction of the limiting rod 701 is parallel to the central axis direction of the connecting roller 1. The present scheme is provided with a plurality of limiting rods 701, when the limiting roller 4 is installed on the connecting roller 1, the limiting roller 4 will press all the limiting rods 701 in the connecting roller 1, so that the one end of the limiting rod 701 far away from the dynamic friction plate 5 is mutually intersected and matched, and the mutual intersecting center of the plurality of limiting rods 701 is located on the central axis of the dynamic friction plate 5, due to the angle of the plurality of limiting rods 701 rotating, the length of the limiting rod 701 projected to the axis direction of the connecting roller 1 becomes smaller, so that the dynamic friction plate 5 moves towards the middle end of the limiting rod 701, and then the dynamic friction plate 5 releases the relationship of being attached with the static friction plate 6; after the connection between the limiting roller 4 and the connecting roller 1 is loose, the limiting roller 4 no longer presses all the limiting rods 701 in the connecting roller 1, so that the one end of the limiting rod 701 far away from the dynamic friction plate 5 releases the state of being mutually intersected at a point, the central axis of the plurality of limiting rods 701 is re-parallel to the central axis of the connecting roller 1, so that the length of the limiting rod 701 projected to the axis direction of the connecting roller 1 becomes larger, so that the dynamic friction plate 5 moves away from the middle end of the limiting rod 701, and then the dynamic friction plate 5 re-locks the relationship of being attached with the static friction plate 6, realizing that after the connection between the limiting roller 4 and the connecting roller 1 is loose, the printing roller 2 will realize emergency braking.It should be noted that the function of the limiting spring 702 is that when the limiting roller 4 no longer presses the limiting rod 701 or the force of the limiting roller 4 pressing the limiting rod 701 becomes smaller due to the loosening of the installation of the limiting roller 4, the limiting spring 702 will move the dynamic friction plate 5 towards the static friction plate 6. In addition, during the rotation of the printing roller 2, the limiting spring 702 will not rotate with the rotation of the printing roller 2.

[0036] Further, the following describes how the limiting roller 4 achieves pressing the limiting rods 701 after being installed on the connecting roller 1. The limiting roller 4 includes an internally hollow annular roller 401 and a plurality of pressing units, the plurality of pressing units are arranged on the annular roller 401 along the central axis of the annular roller 401 at equal angles, the connecting roller 1 is provided with a plurality of connecting grooves, the plurality of connecting grooves are one-to-one corresponding and matched with the plurality of limiting rods 701, any connecting groove is opposite to the other end of the corresponding limiting rod 701, the annular roller 401 is coaxially arranged on the connecting roller 1, one end surface of the annular roller 401 is connected with one end surface of the printing roller 2, the plurality of pressing units are one-to-one corresponding and matched with the plurality of connecting grooves, any pressing unit is arranged on the corresponding connecting groove, and the pressing unit is used for pressing the other end of the corresponding limiting rod 701. It should be noted that the annular roller 401 will not rotate with the rotation of the printing roller 2.

[0037] Specifically, the pressing unit comprises a pressing rod 402, a pressing spring 403 and a telescopic rod 404, the pressing rod 402 is slidably arranged on the side wall of the annular roller 401, the sliding direction of the pressing rod 402 is perpendicular to the central axis of the annular roller 401, the two ends of the pressing spring 403 are connected to the top of the pressing rod 402 and the outer side wall surface of the annular roller 401 respectively, the telescopic rod 404 has a telescopic structure, the two ends of the telescopic rod 404 are connected to the bottom end of the pressing rod 402 and the inner side wall of the annular roller 401 respectively, the inner space of the telescopic rod 404 is communicated with the inner space of the annular roller 401, the limiting roller 4 further comprises a hydraulic pump 405 and a hydraulic tank 406 filled with hydraulic oil, the hydraulic tank 406 is communicated with the inner space of the annular roller 401 through the hydraulic pump 405, and it is worth noting that the central axis direction of the pressing spring 403 of the scheme is parallel to the central axis direction of the telescopic rod 404 and the sliding direction of the pressing rod 402. When the annular roller 401 is coaxially sleeved on the connecting roller 1, a plurality of pressing rods 402 are aligned with corresponding connecting grooves, at this time the hydraulic pump 405 starts to work, and hydraulic oil is injected into the inner part of the annular roller 401. Since the inner space of the annular roller 401 is communicated with the inner space of the telescopic rod 404, the output end of the telescopic rod 404 is continuously elongated due to the injection of hydraulic oil, and then the pressing rod 402 connected with the telescopic rod 404 extends into the connecting groove, and the pressing rod 402 presses the corresponding limiting rod 701. Since the inner space of the annular roller 401 is communicated with the inner space of each telescopic rod 404, the force of each pressing rod 402 on the corresponding limiting rod 701 is consistent, and the elongation of each telescopic rod 404 is also consistent, until the plurality of limiting rods 701 away from one end of the movable friction plate 5 intersect with each other, at this time the installation of the limiting roller 4 on the connecting roller 1 is completed. It is worth noting that the shape of the connecting groove of the scheme is consistent with the cross-sectional shape of the pressing rod 402, and the limiting roller 4 of the scheme is filled with hydraulic oil to ensure that the pressing rod 402 is pressed and matched with the corresponding limiting rod 701 through the corresponding connecting groove, and the limiting roller 4 is installed on the connecting roller 1. Therefore, when the pressing rod 402 of the limiting roller 4 is not aligned and installed in the connecting groove, that is, when an error occurs, the pressing rod 402 cannot be pressed and matched with the limiting rod 701, and the printing roller 2 cannot be released from the emergency braking state; and when the structure of the limiting roller 4 leaks oil, the pressing force of the pressing rod 402 on the limiting rod 701 will be reduced, and the force of the pressing rod 402 on the movable friction plate 5 through the limiting rod 701 will be less than the force of the limiting spring 702 on the movable friction plate 5, which will make the printing roller 2 return to the emergency braking state.

[0038] In order to realize that the length of the printing roller 2 can be changed by the extension and retraction of the two ends of the printing roller 2, the scheme further comprises a hydraulic unit 8, the printing roller 2 comprises a coaxially arranged first rotating drum 201 and a second rotating drum 202, the first rotating drum 201 and the second rotating drum 202 rotate synchronously and can slide relatively along the axial direction of the connecting roller 1, the extension direction of the output end of the hydraulic unit 8 is parallel to the axial direction of the connecting roller 1, and the output end of the hydraulic unit 8 is connected with the rotating motor 3, the rotating motor 3 is coaxially connected with the first rotating drum 201, and the end surface of the second rotating drum 202 is connected with the end surface of the limiting roller 4, and the scheme controls the sliding of the first rotating drum 201 along the central axis of the connecting roller 1 by arranging the hydraulic unit 8.

[0039] Further, the scheme further comprises an adjusting cylinder 9, the extension direction of the output end of the adjusting cylinder 9 is parallel to the axial direction of the connecting roller 1, the output end of the adjusting cylinder 9 is connected with the second rotating drum 202, and the adjusting cylinder 9 drives the second rotating drum 202 to slide along the central axis of the connecting roller 1.

[0040] Further, before the length of the printing roller 2 is adjusted, the pressing cooperation between the pressing rod and the limiting rod 701 needs to be released, and based on this, the scheme further comprises a pressure module 10, the pressure module 10 is arranged in the static friction sheet 6, the pressure module 10 is in communication connection with the adjusting cylinder 9, when the dynamic friction sheet 5 and the static friction sheet 6 are mutually adhered, it indicates that the pressing cooperation between the pressing rod and the corresponding limiting rod 701 is released, the pressure module 10 arranged in the static friction sheet 6 can detect the pressure value, the pressure module 10 transmits the signal to the adjusting cylinder 9, and the adjusting cylinder 9 can control the second rotating drum 202 connected therewith to slide.

[0041] It is worth mentioning that when the second rotating drum 202 is sliding, the limiting roller 4 also slides with the sliding of the second rotating drum 202, in order to ensure that the structure of the limiting roller 4 does not interfere with the structure of the connecting roller 1 during the sliding, a plurality of connecting slots of the present scheme jointly constitute a slot group, the connecting roller 1 is provided with a plurality of slot groups, and the plurality of slot groups are equidistantly arranged on the side wall of the connecting roller 1 along the axis direction of the connecting roller 1. The connecting roller 1 is also provided with a plurality of connecting grooves, and the plurality of connecting grooves and the plurality of connecting slots in a single slot group are one-to-one corresponding and matched. Any connecting groove and any connecting slot of the plurality of slot groups are in communication with each other. The setting direction of the connecting groove is parallel to the center axis direction of the connecting roller 1. The shortest distance between the connecting groove and the center of the connecting roller 1 is less than the shortest distance between the bottom surface of the pressing rod 402 and the center of the connecting roller 1 when the dynamic friction plate 5 and the static friction plate 6 are attached to each other. Through such setting, when the second rotating drum 202 is sliding, the pressing rod 402 can also slide in the corresponding connecting groove until the limiting roller 4 can reach the remaining slot groups. It should be noted that the middle end of the limiting rod 701 is hingedly arranged on the inner side wall of the second rotating drum 202, and the limiting rod 701 slides with the sliding of the second rotating drum 202, but does not rotate with the rotation of the second rotating drum 202.

[0042] Further, the printing roller 2 of the present scheme further comprises a plurality of transmission rods 203. The end of the second rotating drum 202 close to the first rotating drum 201 is provided with a plurality of transmission slots. The plurality of transmission slots are equiangularly arranged on the second rotating drum 202 along the center axis of the second rotating drum 202. The center axis of the transmission slot is parallel to the center axis of the second rotating drum 202. The plurality of transmission rods 203 are one-to-one corresponding and matched with the plurality of transmission slots. One end of any transmission rod 203 is connected with the end surface of the first rotating drum 201, and the other end is coaxially connected with the corresponding transmission slot. By providing the transmission rod 203, the first rotating drum 201 drives the second rotating drum to rotate together, and the first rotating drum 201 and the second rotating drum 202 realize relative sliding.

[0043] Specifically, the printing roller 2 of the present scheme further comprises a rotating roller 204 and a plurality of expansion units 11. The rotating roller 204 is coaxially arranged on the connecting roller 1. The plurality of expansion units 11 are equiangularly arranged on the side wall of the rotating roller 204 along the center axis of the rotating roller 204. There is a transmission space between any two transmission rods 203. The plurality of transmission spaces are one-to-one corresponding and matched with the plurality of expansion units 11. Any expansion unit 11 is arranged in the corresponding transmission space.

[0044] The expansion unit 11 comprises a plurality of expansion blocks 1101 and a plurality of expansion cylinders 1102, the plurality of expansion blocks 1101 and the plurality of expansion cylinders 1102 are matched one by one, any expansion block 1101 is arranged at the output end of the corresponding expansion cylinder 1102, the plurality of expansion cylinders 1102 are arranged on the side wall of the rotating roller 204 along the axis direction of the rotating roller 204 at equal intervals, and the two ends of the adjacent two expansion blocks 1101 are in close contact with each other; when the expansion cylinder 1102 is stretched out, the distance between the surface of the expansion block 1101 and the center of the connecting roller 1 is equal to the distance between the surface of the printing roller 2 and the center of the connecting roller 1; when the expansion cylinder 1102 is retracted, the distance between the surface of the expansion block 1101 and the center of the connecting roller 1 is less than the distance between the inner side wall of the printing roller 2 and the center of the connecting roller 1. Through such a setting, when the distance between the first rotating drum 201 and the second rotating drum 202 is adjusted, the expansion cylinder 1102 is provided with the expansion unit 11, the expansion cylinder 1102 is stretched out from the output end, so that the expansion block 1101 is stretched out, and the plurality of expansion blocks 1101 and the first rotating drum 201 and the second rotating drum 202 jointly form a new roller. It is worth noting that the printing machine of the present scheme is by means of the printing plate sleeved on the printing roller 2, the printing plate is driven to rotate by the rotation of the printing roller 2, and then the pattern of the printing plate is printed on the paper, and the plurality of expansion blocks 1101 and the first rotating drum 201 and the second rotating drum 202 jointly form a new roller, although there is a gap between the adjacent expansion blocks 1101 of different expansion units 11, but because the gap is small, it does not affect the pattern effect of the printing plate on the paper.

[0045] Further, in order to ensure that the corresponding expansion block 1101 can expand when the first rotating drum 201 and the second rotating drum 202 slide relative to each other, the printing roller 2 further comprises two sets of limiting structures, which are matched with the first rotating drum 201 and the second rotating drum 202 one by one, any limiting structure is arranged in the corresponding rotating drum, and the two limiting structures are symmetrically arranged at the two ends of the rotating roller 204; the limiting structure comprises a plurality of limiting units, the plurality of limiting units are matched with the plurality of expansion units 11 one by one, any limiting unit is slidingly arranged on the corresponding expansion unit 11, the surfaces of the plurality of expansion blocks 1101 of the same expansion unit 11 jointly form a limiting groove 1103, the limiting unit comprises a connecting rod 12 and a limiting rod 13, the limiting rod 13 is slidingly arranged in the corresponding limiting groove 1103, and the two ends of the connecting rod 12 are fixedly connected to the inner side wall of the first rotating drum 201 and one end of the limiting rod 13 respectively. By arranging the limiting unit, when the limiting rod 13 is on the corresponding expansion block 1101, it means that the limiting rod 13 locks the cooperation relationship with the corresponding expansion block 1101, and the corresponding expansion block 1101 cannot be expanded by the expansion cylinder 1102; while the limiting rod 13 releases the limiting relationship with part of the expansion blocks 1101, the expansion blocks 1101 can be expanded by the corresponding expansion cylinder 1102. In addition, due to the connection relationship between the connecting rod 12 and the limiting rod 13, when the first rotating drum 201 rotates, the rotating force of the first rotating drum 201 is transmitted to the expansion block 1101 which is in the locking relationship with the limiting rod 13 through the connecting rod 12 and the limiting rod 13, and then to the rotating roller 204, so that the rotating roller 204 and the first rotating drum 201 are synchronously rotated. The rotating force of the rotating roller 204 is transmitted to the expansion block 1101 which is in the releasing relationship with the limiting rod 13, so that the expansion block 1101 which is in the releasing relationship with the limiting rod 13 and the first rotating drum 201 are synchronously rotated, thereby ensuring the printing quality.

[0046] It is worth noting that, in order to ensure the normal operation of the scheme, when the end face of the first rotating drum 201 and the end face of the second rotating drum 202 are in close contact with each other, the two limiting rods 13 on the same limiting groove 1103 are in close contact with each other, and the close contact part of the two limiting rods 13 is located on the central surface of the rotating roller 204. The length of the limiting rod 13 is greater than or equal to half the length of the limiting groove 1103, the length of the limiting groove 1103 is longer than the gap length between the first rotating drum 201 and the second rotating drum 202, and the width of the expansion block 1101 is equal to the interval between the adjacent two groove hole groups.

[0047] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed with the preferred embodiments as above, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, as long as the changes or modifications do not deviate from the technical solution of the present application. Any modification, change, equivalent change and modification of the above embodiments made according to the technical essence of the present application still belong to the scope of the technical solution of the present application.

Claims

1. A fully servo driven flexographic printing press characterized by: The application relates to a length-adjustable printing roller device, which comprises a connecting roller, a length-adjustable printing roller, a rotating motor, a limiting roller and a limiting assembly. The limiting assembly comprises a dynamic friction sheet, a static friction sheet and a limiting unit, the dynamic friction sheet and the static friction sheet are coaxially arranged in one end of the printing roller close to the limiting roller, the static friction sheet is connected with the printing roller through a connecting piece, so that the static friction sheet rotates with the printing roller, the dynamic friction sheet is slidably arranged on the connecting roller and cannot rotate, the limiting unit is arranged in the connecting roller, two ends of the limiting unit are connected with the limiting roller and the dynamic friction sheet respectively, the limiting roller controls the sliding of the dynamic friction sheet by locking or releasing the connection with the limiting unit, and the dynamic friction sheet locks or releases the adhering relationship with the static friction sheet, when the limiting roller is not loosened after being installed on the connecting roller, the limiting roller locks the connection with the limiting unit, so that the dynamic friction sheet and the static friction sheet are separated from each other, the rotation of the static friction sheet is not limited, and the printing roller can normally rotate; when the limiting roller is loosened after being installed on the connecting roller, the limiting roller releases the connection with the limiting unit, so that the dynamic friction sheet and the static friction sheet adhere to each other, the rotation of the static friction sheet is limited, and the printing roller realizes emergency braking.

2. The full servo-driven flexographic printing press of claim 1, wherein: The limiting unit comprises a limiting spring and a plurality of limiting rods, two ends of the limiting spring are connected with the dynamic friction sheet and one end of the printing roller close to the limiting roller respectively, the plurality of limiting rods are arranged in the connecting roller at equal angles around the central axis of the connecting roller, a plurality of limiting shafts are matched with the plurality of limiting rods one by one, the connecting roller is provided with a plurality of limiting notches at equal angles around the central axis, the plurality of limiting notches are matched with the plurality of limiting shafts one by one, one end of the limiting shaft passes through the corresponding limiting notch and is slidably arranged on the inner side wall of the printing roller, and the other end of the limiting shaft is hingedly arranged with the middle end of the corresponding limiting rod, one end of the limiting rod is slidably arranged on the end face of the dynamic friction sheet, the sliding track of one end of the limiting rod on the end face of the dynamic friction sheet is perpendicular to the central axis of the dynamic friction sheet, and the other ends of the plurality of limiting rods can lock or release the interlocking relationship, and the centers of the plurality of limiting rods interlocking with each other are located on the central axis of the dynamic friction sheet.

3. The all-servo driven flexographic printing press of claim 2, wherein: The limiting roller comprises an internally hollow annular roller and a plurality of pressing units, the plurality of pressing units are arranged on the annular roller along the central axis of the annular roller at equal angles, the connecting roller is provided with a plurality of connecting grooves, the plurality of connecting grooves are matched with the plurality of limiting rods one by one, any connecting groove is opposite to the other end of the corresponding limiting rod, the annular roller is coaxially arranged on the connecting roller, one end surface of the annular roller is connected with one end surface of the printing roller, the plurality of pressing units are matched with the plurality of connecting grooves one by one, any pressing unit is arranged on the corresponding connecting groove, and the pressing unit is used for pressing the other end of the corresponding limiting rod.

4. The all-servo driven flexographic printing press of claim 3, wherein: The pressing unit comprises a pressing rod, a pressing spring and a telescopic rod, the pressing rod is slidably arranged on the side wall of the annular roller, the sliding direction of the pressing rod is perpendicular to the central axis of the annular roller, the two ends of the pressing spring are connected with the top of the pressing rod and the outer side wall surface of the annular roller respectively, the telescopic rod has a telescopic structure, the two ends of the telescopic rod are connected with the bottom end of the pressing rod and the inner side wall of the annular roller respectively, the internal space of the telescopic rod is communicated with the internal space of the annular roller, and the limiting roller further comprises a hydraulic pump and a hydraulic tank containing hydraulic oil, the hydraulic tank is communicated with the internal space of the annular roller through the hydraulic pump.

5. The all-servo driven flexographic printing press of claim 4, wherein: Further comprising a hydraulic unit, the printing roller comprises a first rotating drum and a second rotating drum arranged coaxially, the first rotating drum and the second rotating drum rotate synchronously and can relatively slide along the axial direction of the connecting roller, the output end of the hydraulic unit is parallel to the axial direction of the connecting roller in the telescopic direction, and the output end of the hydraulic unit is connected with the rotating motor, the rotating motor is coaxially connected with the first rotating drum, and the end surface of the second rotating drum is connected with the end surface of the limiting roller.

6. The all-servo driven flexographic printing press of claim 5, wherein: Further comprising an adjusting cylinder, the telescopic direction of the output end of the adjusting cylinder is parallel to the axial direction of the connecting roller, and the output end of the adjusting cylinder is connected with the second rotating drum to drive the second rotating drum to slide.

7. The all-servo driven flexographic printing press according to claim 6, characterized in that: Further comprising a pressure module arranged in the static friction sheet, the pressure module is in communication connection with the adjusting cylinder, a plurality of connecting grooves collectively form a groove group, the connecting roller is provided with a plurality of groove groups, the plurality of groove groups are arranged on the side wall of the connecting roller at equal intervals along the axial direction of the connecting roller, the connecting roller is further provided with a plurality of connecting grooves, the plurality of connecting grooves in a single groove group are matched with the plurality of connecting grooves one by one, any connecting groove is communicated with any connecting groove of the plurality of groove groups, the arrangement direction of the connecting groove is parallel to the central axis direction of the connecting roller, and the shortest distance between the connecting groove and the center of the connecting roller is less than the shortest distance between the bottom surface of the pressing rod and the center of the connecting roller when the dynamic friction sheet and the static friction sheet are mutually attached.

8. The all-servo driven flexographic printing press according to claim 7, characterized in that: The printing roller further comprises a plurality of transmission rods, a plurality of transmission grooves are formed on an end face of the second drum close to the first drum, the plurality of transmission grooves are formed on the second drum at equal angles along a central axis of the second drum, central axes of the transmission grooves are parallel to the central axis of the second drum, the plurality of transmission rods and the plurality of transmission grooves are one-to-one corresponding and matched, one end of any transmission rod is connected with the end face of the first drum, and the other end is coaxially connected with the corresponding transmission groove; The printing roller further comprises a rotating roller and a plurality of expansion units, the rotating roller is coaxially sleeved on the connecting roller, the plurality of expansion units are arranged on the side wall of the rotating roller at equal angles along the central axis of the rotating roller, there is a transmission space between any two adjacent transmission rods, the plurality of transmission spaces and the plurality of expansion units are one-to-one corresponding and matched, and any expansion unit is arranged in the corresponding transmission space; The expansion unit comprises a plurality of expansion blocks and a plurality of expansion cylinders, the plurality of expansion blocks and the plurality of expansion cylinders are one-to-one corresponding and matched, any expansion block is arranged at the output end of the corresponding expansion cylinder, the plurality of expansion cylinders are arranged on the side wall of the rotating roller at equal intervals along the axial direction of the rotating roller, and the two ends of any two adjacent expansion blocks are in close contact with each other. When the expansion cylinder is extended, the distance between the surface of the expansion block and the center of the connecting roller is equal to the distance between the surface of the printing roller and the center of the connecting roller; when the expansion cylinder is retracted, the distance between the surface of the expansion block and the center of the connecting roller is less than the distance between the inner side wall of the printing roller and the center of the connecting roller.

9. The full servo-driven flexographic printing press according to claim 8, characterized in that: The printing roller further comprises two sets of limiting structures, the two sets of limiting structures are one-to-one corresponding and matched with the first drum and the second drum, any limiting structure is arranged in the corresponding drum, and the two limiting structures are symmetrically arranged at the two ends of the rotating roller; the limiting structure comprises a plurality of limiting units, the plurality of limiting units and the plurality of expansion units are one-to-one corresponding and matched, any limiting unit is slidingly arranged on the corresponding expansion unit, the surfaces of the plurality of expansion blocks of the same expansion unit jointly form a limiting groove, the limiting unit comprises a connecting rod and a limiting rod, the limiting rod is slidingly arranged in the corresponding limiting groove, and the two ends of the connecting rod are fixedly connected with the inner side wall of the printing roller and one end of the limiting rod respectively; when the end face of the first drum and the end face of the second drum are in close contact with each other, the two limiting rods located in the same limiting groove are in close contact with each other, and the contact position of the two limiting rods is located on the central face of the rotating roller.

10. The full servo-driven flexographic printing press of claim 9, wherein: The length of the limiting rod is greater than or equal to half the length of the limiting groove, the length of the limiting groove is longer than the gap length between the first drum and the second drum, and the width dimension of the expansion block is equal to the interval dimension between the adjacent two groove groups.

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