An automatic roll changing device for a flexographic printing press

Abstract

The present invention provides an automatic roll-changing device for a flexographic printing machine in the technical field of flexographic printing roll-changing technology. By setting a roll-changing rack, the roll-changing rack can achieve automatic loading and automatic unloading. By arranging multiple groups of material-taking rods on the roll-changing rack, the material-taking rods can drive the roll of material to move together as the roll-changing rack rotates, so as to take out the roll of material from the outlet of the loading box and bring it into the receiving roll groove on the roll-changing rack, realizing automatic loading and preparing for roll-changing. By setting a roll-unloading member, in the roll-unloading member, an electric telescopic rod drives the upper clamping plate and the lower clamping plate to move to clamp the used roll of material. When the roll of material is used up, the electric telescopic rod is automatically started during the rotation of the roll-changing rack to clamp the used roll of material, realizing automatic unloading. After unloading, the roll-changing rack continues to rotate, and the receiving roll groove adjacent to the upper part of the roll-unloading member rotates with the opening facing downwards, and the spare roll of material inside rolls out of the receiving roll groove under the action of its own gravity and falls into the installation groove on the installation table, realizing automatic roll-changing.

Description

Technical Field

[0001] The present application relates to the technical field of flexographic printing roll changing, and particularly relates to an automatic roll changing device for a flexographic printing press. Background Art

[0002] The structure of a flexographic printing press includes a machine body, an ink transfer system, a paper pressing system, a roll paper system, and a control system. The flexographic printing press uses a fluid ink with relatively strong fluidity. The ink is transferred from an ink fountain roller and an anilox roller to the graphic part of the printing plate to make it inked, and then the printing pressure is applied by a printing cylinder to transfer the ink on the printing plate to the printing substrate, and finally the printing process is completed through a drying surface. Since the structure of the flexographic printing mechanism is relatively simple, the equipment investment is lower than that of an offset printing press or a gravure printing press of the same scale. Due to the simple printing principle, clear structure, and high working efficiency of the flexographic printing press, it is widely used in the printing of packaging and decoration products.

[0003] During the flexographic printing process, the roll material is a key consumable, such as paper, film, etc. When a roll of material is used up, it is necessary to switch to a new roll of material to continue production. The traditional roll changing method mostly relies on manual operation. When the roll of material is used up, it is necessary for workers to remove the used roll of material, and then install a new roll of material before continuing the printing work. And because the roll of material is relatively large, usually two people are needed to jointly lift the roll of material for replacement and installation. Such roll changing operation is slow, which not only reduces the roll changing efficiency, but also greatly increases the downtime of the printing press, thereby reducing the printing efficiency. Moreover, manual roll changing may also cause problems such as material waste and printing quality decline.

[0004] Therefore, we propose an automatic roll changing device for a flexographic printing press to solve the above problems, so as to achieve efficient and accurate roll changing operation, reduce downtime, and improve production efficiency. Summary of the Invention

[0005] Aiming at the problems existing in the prior art, the purpose of the present application is to achieve automatic roll changing through automatic loading and automatic unloading. By automatically taking materials during the process of unloading the roll, automatic loading is realized, and the installation of the standby roll of material is realized while unloading the roll. While realizing automatic roll changing, the roll changing speed and roll changing efficiency are greatly improved. Compared with the prior art, an automatic roll changing device for a flexographic printing press is provided.

[0006] To solve the above technical problems, the present invention adopts the following technical solutions.

[0007] An automatic roll changing device for a flexographic printing press includes a workbench and a roll of material. The roll of material includes a coil material, a material roller, and a roller shaft. The coil material is wound around the outer side of the middle part of the material roller. The roller shaft is fixedly connected to both ends of the material roller. A pair of support frames are fixedly connected to the workbench. A roll changing frame is arranged between the pair of support frames. Multiple sets of roll unloading components are arranged on the roll changing frame;

[0008] The roll changing rack includes a mounting shaft, a mounting plate, a coil receiving groove and a material taking rod;

[0009] The mounting shaft is rotatably connected to the support frame. There are two mounting plates, and the two mounting plates are symmetrically and fixedly sleeved on the outer side of the mounting shaft. The coil receiving groove is opened on the mounting plate, and there are multiple coil receiving grooves. The material taking rod is fixedly connected to one side of the coil receiving groove.

[0010] Further, one end of the material taking rod away from the mounting plate is bent in a hook shape, and the inner side surface of the material taking rod is flush with the side wall of the coil receiving groove.

[0011] Further, a servo motor is fixedly installed on the workbench, and the output shaft of the servo motor is fixedly connected to one end of the mounting shaft.

[0012] Further, the coil unloading member is arranged between two adjacent material taking rods. The coil unloading member includes an electric telescopic rod, a chute, a sliding rod, a connecting rod, a connecting block, an upper clamping plate, a lower clamping plate, a control switch and a pressing plate;

[0013] The electric telescopic rod is fixedly connected to one of the mounting plates. The chute is opened on the other mounting plate. The sliding rod is slidably connected to the chute. The connecting rod is fixedly connected between the sliding rod and the output end of the electric telescopic rod. There are two connecting blocks, and the two connecting blocks are respectively fixedly connected to the output end of the electric telescopic rod and the end of the sliding rod away from the chute. The upper clamping plate and the lower clamping plate are respectively rotatably connected to the upper end and the lower end of the connecting block through a rotating shaft. A torsion spring is fixedly connected between the rotating shaft and the upper clamping plate and the lower clamping plate. The control switch is arranged on the mounting plate, and the pressing plate is fixedly connected to the support frame.

[0014] Further, a coil releasing plate is fixedly connected to the workbench, and an extrusion inclined surface is opened on one side of the coil releasing plate close to the coil.

[0015] Further, a coil receiving box is arranged below the extrusion inclined surface. The coil receiving box is fixedly connected to the workbench. The bottom of the coil receiving box is inclined, and the lower end of the coil receiving box is open.

[0016] Further, a feeding box is fixedly connected to the workbench. The top of the feeding box is in a funnel shape. The bottom of the feeding box is fixedly connected to a support platform. Both ends of the coil are supported on the support platform. A limiting block is fixedly connected to the end of the support platform. The material of the limiting block is polyurethane.

[0017] Further, it further includes a mounting table. An installation groove is opened on the mounting table. A pressure sensor is arranged at the bottom of the installation groove. The pressure sensor is connected to the servo motor through a controller. A guiding plate is fixedly connected to the mounting table.

[0018] Compared with the prior art, the advantages of the present application are as follows:

[0019] (1) By providing a roll changing rack, the roll changing rack can achieve automatic feeding and automatic discharging. The servo motor operates to drive the mounting shaft and the mounting plate to rotate clockwise, thereby driving the material taking rod to rotate clockwise from bottom to top. When the material taking rod is in a horizontal position, at this time, the material taking rod contacts the roller shaft of the material roll. Then the material taking rod continues to rotate, and the material taking rod can drive the material roll to move together to take out the material roll from the outlet of the feeding box. The material taking rod continues to rotate to drive the material roll to continue rising. Under the action of its own gravity, the material roll will roll along the side wall of the straight section of the material taking rod during the rising process until it rolls into the receiving roll groove, realizing automatic feeding and preparing for roll changing.

[0020] (2) By setting the end of the material taking rod far from the mounting plate into a hook shape, the hook-shaped end of the material taking rod can automatically take out the material roll from the feeding box during the rotation process, and through the guiding of the straight section of the material taking rod, the taken-out material roll can be smoothly rolled into the receiving roll groove, realizing automatic material taking.

[0021] (3) By providing multiple sets of roll discharging members on the roll changing rack, the roll discharging members can take down the used material roll. When the material roll is used up, the servo motor drives the mounting shaft and the mounting plate to rotate clockwise. When the pressing plate presses against the control switch, at this time, the servo motor stops rotating, and the electric telescopic rod starts to extend, driving the two sets of upper clamping plates and lower clamping plates to move synchronously. The upper clamping plates and the lower clamping plates move to contact and press against the material roll. At this time, under the action of the pressing force, the upper clamping plates and the lower clamping plates rotate and open. When the material roll enters the inside of the upper clamping plates and the lower clamping plates, the upper clamping plates and the lower clamping plates reset under the elastic force of the torsion spring, thereby clamping the material roll. Then the electric telescopic rod resets, driving the used material roll to leave the mounting table, realizing automatic discharging.

[0022] (4) By providing a roll releasing plate on the workbench, providing a pressing inclined surface on the roll releasing plate, and providing a receiving roll box with an inclined bottom below the pressing inclined surface. After the upper clamping plates and the lower clamping plates clamp the used material roll and leave the mounting table, the servo motor continues to drive the mounting plate to rotate. At this time, the end of the material roll clamped by the upper clamping plates and the lower clamping plates contacts and presses against the pressing inclined surface, so that the used material roll is separated from the upper clamping plates and the lower clamping plates during the rotation process and falls into the lower receiving roll box, and automatically slides out from the bottom of the receiving roll box. During this process, the receiving roll groove adjacent to the upper part of the roll discharging member opens downward with the rotation, and the spare material roll inside it rolls out of the receiving roll groove under the action of its own gravity and falls into the mounting groove on the mounting table, realizing automatic roll changing.

[0023] (5) By setting up a loading box, a support platform is set at the bottom of the loading box, and a limit block is set at the end of the support platform. Multiple spare coils are placed into the loading box from the top of the loading box. Under the action of the self-gravity of the coil, the coil will move towards the opening at the bottom of the loading box and stay in the loading box under the interception of the limit block, waiting to be taken out in sequence.

[0024] (6) By setting the material of the limit block to polyurethane, the limit block made of polyurethane can, on the one hand, buffer the end of the coil, and on the other hand, mute the noise generated by collisions, optimizing the working environment.

[0025] (7) By setting a pressure sensor at the bottom of the installation groove, when the pressure received by the pressure sensor is lower than the threshold value, it means that the coil material of the coil is almost used up at this time. The pressure sensor transmits the detected signal to the processor, and the processor controls the servo motor to start through the controller, automatically triggering the coil change operation.

[0026] (8) By setting a guide plate, the guide plate can guide the falling coil so that it accurately falls into the installation groove.

[0027] (9) By synchronously realizing loading and the installation of spare coils during the unloading process, automatic coil change is achieved through automatic loading and automatic unloading, making the coil change operation faster and more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the present application in the unloaded state;

[0029] Figure 2 It is a schematic diagram of the overall structure of the present application in the unloading state;

[0030] Figure 3 It is a schematic diagram of the coil changing rack structure of the present application;

[0031] Figure 4 For the present application Figure 1 Enlarged view of the partial structure at A in the figure;

[0032] Figure 5 For the present application Figure 2 Enlarged view of the partial structure at B in the figure;

[0033] Figure 6 For the present application Figure 2 Enlarged view of the partial structure at C in the figure;

[0034] Figure 7 For the present application Figure 2 Enlarged view of the partial structure at D in the figure.

[0035] Explanation of the reference numerals in the figure:

[0036] 1. Workbench; 101. Support frame; 2. Material roll; 201. Coil material; 202. Material roller; 203. Roller shaft; 3. Rewinding rack; 301. Mounting shaft; 302. Mounting plate; 303. Coil receiving groove; 304. Material taking rod; 4. Unloading member; 401. Electric telescopic rod; 402. Chute; 403. Slide bar; 404. Connecting rod; 405. Connecting block; 406. Upper clamping plate; 407. Lower clamping plate; 408. Control switch; 409. Extrusion plate; 5. Servo motor; 6. Unwinding plate; 7. Extrusion inclined surface; 8. Coil receiving box; 9. Loading box; 10. Support table; 11. Limit block; 12. Mounting table; 13. Mounting groove; 14. Pressure sensor; 15. Guide plate. Detailed implementation manners

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application. Embodiment

[0038] The present invention provides an automatic roll changing device for a flexographic printing press. Please refer to Figures 1-7 , which includes a workbench 1 and a material roll 2. The material roll 2 includes a coil material 201, a material roller 202 and a roller shaft 203. The coil material 201 is wound around the outer side of the middle part of the material roller 202. The roller shaft 203 is fixedly connected to both ends of the material roller 202. A pair of support frames 101 are fixedly connected to the workbench 1. A rewinding rack 3 is arranged between the pair of support frames 101. The rewinding rack 3 can realize automatic feeding and automatic discharging. Multiple groups of unloading members 4 are arranged on the rewinding rack 3. The unloading members 4 are used to remove the used material roll 2.

[0039] The roll changing rack 3 includes a mounting shaft 301, a mounting plate 302, a coil receiving groove 303 and a material taking rod 304; the mounting shaft 301 is rotatably connected to the support frame 101, a servo motor 5 is fixedly installed on the workbench 1, and the output shaft of the servo motor 5 is fixedly connected to one end of the mounting shaft 301. By driving the mounting shaft 301 to rotate through the servo motor 5, the roll changing rack 3 and the coil 2 thereon are driven to rotate, so as to replace the used coil 2. There are two mounting plates 302, and the two mounting plates 302 are symmetrically and fixedly sleeved on the outer side of the mounting shaft 301. The coil receiving groove 303 is opened on the mounting plate 302, and there are multiple coil receiving grooves 303. The material taking rod 304 is fixedly connected to one side of the coil receiving groove 303. The end of the material taking rod 304 away from the mounting plate 302 is provided with a hook shape. The inner side surface of the material taking rod 304 is flush with the side wall of the coil receiving groove 303. The hook-shaped end of the material taking rod 304 can automatically take out the coil 2 from the loading box 9 during the rotation process, and the taken-out coil 2 can smoothly roll into the coil receiving groove 303 through the guiding of the straight section of the material taking rod 304, realizing automatic material taking.

[0040] Specifically, when the servo motor 5 works, it drives the mounting shaft 301 and the mounting plate 302 to rotate clockwise, so as to drive the material taking rod 304 to rotate clockwise from bottom to top. When the material taking rod 304 is in the horizontal position, at this time, the material taking rod 304 contacts the roller shaft 203 of the coil 2. Then the material taking rod 304 continues to rotate, and the material taking rod 304 can drive the coil 2 to move together so as to take out the coil 2 from the outlet of the loading box 9. The material taking rod 304 continues to rotate to drive the coil 2 to continue to rise. Under the action of its own gravity, the coil 2 will roll along the side wall of the straight section of the material taking rod 304 during the rising process until it rolls into the coil receiving groove 303, realizing automatic feeding and preparing for roll changing.

[0041] The coil unloading member 4 is arranged between two adjacent material taking rods 304. The coil unloading member 4 includes an electric telescopic rod 401, a chute 402, a sliding rod 403, a connecting rod 404, a connecting block 405, an upper clamping plate 406, a lower clamping plate 407, a control switch 408 and a pressing plate 409; the electric telescopic rod 401 is fixedly connected to one of the mounting plates 302, the chute 402 is opened on the other mounting plate 302, the sliding rod 403 is slidably connected to the chute 402, the connecting rod 404 is fixedly connected between the sliding rod 403 and the output end of the electric telescopic rod 401. There are two connecting blocks 405, and the two connecting blocks 405 are respectively fixedly connected to the output end of the electric telescopic rod 401 and the end of the sliding rod 403 away from the chute 402. The upper clamping plate 406 and the lower clamping plate 407 are respectively rotatably connected to the upper end and the lower end of the connecting block 405 through a rotating shaft. A torsion spring is fixedly connected between the rotating shaft and the upper clamping plate 406 and the lower clamping plate 407. The control switch 408 is arranged on the mounting plate 302, and the pressing plate 409 is fixedly connected to the support frame 101.

[0042] Specifically, when the material roll 2 is used up, the servo motor 5 drives the mounting shaft 301 and the mounting plate 302 to rotate clockwise. When the pressing plate 409 presses against the control switch 408, the servo motor 5 stops rotating at this time, and the electric telescopic rod 401 starts to extend, driving the two groups of upper clamping plates 406 and lower clamping plates 407 to move synchronously. The upper clamping plate 406 and the lower clamping plate 407 move to contact and press against the material roll 2. At this time, under the action of the pressing force, the upper clamping plate 406 and the lower clamping plate 407 rotate and open. When the material roll 2 enters the inside of the upper clamping plate 406 and the lower clamping plate 407, the upper clamping plate 406 and the lower clamping plate 407 reset under the elastic force of the torsion spring, thereby clamping the material roll 2. Then the electric telescopic rod 401 resets, driving the used-up material roll 2 to leave the mounting table 12, realizing automatic unloading.

[0043] A unwinding plate 6 is fixedly connected to the workbench 1. An extrusion inclined surface 7 is provided on one side of the unwinding plate 6 close to the material roll 2. A receiving coil box 8 is arranged below the extrusion inclined surface 7. The receiving coil box 8 is fixedly connected to the workbench 1. The bottom of the receiving coil box 8 is inclined. The lower end of the receiving coil box 8 is open. After the upper clamping plate 406 and the lower clamping plate 407 clamp the used-up material roll 2 and separate from the mounting table 12, the servo motor 5 continues to drive the mounting plate 302 to rotate.

[0044] A loading box 9 is fixedly connected to the workbench 1. The top of the loading box 9 is funnel-shaped. A support platform 10 is fixedly connected to the bottom of the loading box 9. Both ends of the material roll 2 are supported on the support platform 10. A limiting block 11 is fixedly connected to the end of the support platform 10. The material of the limiting block 11 is polyurethane. The polyurethane limiting block 11 can buffer the ends of the material roll 2 on the one hand and can also eliminate the noise generated by collisions on the other hand, optimizing the working environment.

[0045] Specifically, a plurality of spare material rolls 2 are placed into the loading box 9 from the top of the loading box 9. Under the action of the self-gravity of the material roll 2, the material roll 2 will move towards the opening at the bottom of the loading box 9 and stay in the loading box 9 under the blocking action of the limiting block 11, waiting to be taken out in turn.

[0046] It further includes a mounting table 12 (the mounting table 12 can be installed on the printing machine or can be set on the workbench 1, and the installation method can be selected according to the actual working environment). An installation groove 13 is provided on the mounting table 12. A pressure sensor 14 is arranged at the bottom of the installation groove 13. The pressure sensor 14 is connected to the servo motor 5 through a controller. A guiding plate 15 is fixedly connected to the mounting table 12. The guiding plate 15 can guide the falling material roll 2 to accurately fall into the installation groove 13.

[0047] Specifically, when the pressure received by the pressure sensor 14 is lower than the threshold value, it means that the web 201 of the coil 2 is almost used up. The pressure sensor 14 transmits the detected signal to the processor, and the processor controls the servo motor 5 to start through the controller, automatically triggering the coil changing operation.

[0048] Working principle: Multiple spare coils 2 are placed into the loading box 9 from the top of the loading box 9. Under the action of the self-gravity of the coil 2, the coil 2 will move towards the opening at the bottom of the loading box 9 and stay in the loading box 9 under the blocking action of the limiting block 11, waiting to be taken out in turn.

[0049] When the pressure received by the pressure sensor 14 is lower than the threshold value, it means that the web 201 of the coil 2 is almost used up. The pressure sensor 14 transmits the detected signal to the processor, and the processor controls the servo motor 5 to start through the controller, automatically triggering the coil changing operation.

[0050] The servo motor 5 works, driving the mounting shaft 301 and the mounting plate 302 to rotate clockwise. When the pressing plate 409 presses against the control switch 408, the servo motor 5 stops rotating, and the electric telescopic rod 401 starts to extend, driving the two sets of upper clamping plates 406 and lower clamping plates 407 to move synchronously. The upper clamping plate 406 and the lower clamping plate 407 move to contact and press against the coil 2. At this time, under the action of the pressing force, the upper clamping plate 406 and the lower clamping plate 407 rotate and open. When the coil 2 enters the inside of the upper clamping plate 406 and the lower clamping plate 407, the upper clamping plate 406 and the lower clamping plate 407 reset under the elastic force of the torsion spring, thereby clamping the coil 2. Then the electric telescopic rod 401 resets, driving the used-up coil 2 away from the mounting table 12, realizing automatic unloading.

[0051] The servo motor 5 continues to drive the mounting shaft 301 and the mounting plate 302 to rotate clockwise. At this time, the end of the coil 2 clamped by the upper clamping plate 406 and the lower clamping plate 407 contacts and presses against the pressing inclined surface 7, so that the used-up coil 2 disengages from the upper clamping plate 406 and the lower clamping plate 407 during the rotation process and falls into the lower coil receiving box 8, automatically sliding out from the bottom of the coil receiving box 8. During this process, the adjacent coil receiving groove 303 above the coil unloading member 4 opens downward with the rotation, and the spare coil 2 inside it rolls out of the coil receiving groove 303 under the action of its own gravity and falls into the mounting groove 13 on the mounting table 12, realizing automatic coil changing.

[0052] Meanwhile, during this process, the mounting plate 302 rotates clockwise, driving the material taking rod 304 to rotate clockwise from bottom to top. When the material taking rod 304 is in a horizontal position, at this time, the material taking rod 304 contacts the roller shaft 203 of the material roll 2. Then the material taking rod 304 continues to rotate, and the material taking rod 304 can drive the material roll 2 to move together so as to take out the material roll 2 from the outlet of the loading box 9. The material taking rod 304 continues to rotate to drive the material roll 2 to continue to rise. Under the action of its own gravity, the material roll 2 will roll along the side wall of the straight section of the material taking rod 304 during the rising process until it rolls into the coil receiving groove 303, realizing automatic feeding and preparing for coil replacement;

[0053] Therefore, in this application, feeding and the installation of the spare material roll 2 are synchronously realized during the unloading process. Automatic coil replacement is achieved through automatic feeding and automatic unloading, making the coil replacement operation faster and more efficient.

[0054] The above is only a preferred specific embodiment of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed by this application, according to the technical solution and its improved concept of this application, makes equivalent replacements or changes, and should be covered by the protection scope of this application.

Claims

1. An automatic roll-changing device for a flexographic printing press, comprising a workbench (1) and a roll of material (2), wherein the roll of material (2) includes a web (201), a material roller (202), and a roller shaft (203). The web (201) is wound around the outer side of the middle part of the material roller (202), and the roller shaft (203) is fixedly connected to both ends of the material roller (202), characterized in that, A pair of support frames (101) are fixedly connected to the workbench (1), a rewinding rack (3) is arranged between the pair of support frames (101), and multiple sets of unwinding members (4) are arranged on the rewinding rack (3); The rewinding rack (3) includes a mounting shaft (301), a mounting plate (302), a coil receiving groove (303), and a material taking rod (304); The mounting shaft (301) is rotatably connected to the support frame (101), there are two mounting plates (302), and the two mounting plates (302) are symmetrically and fixedly sleeved on the outer side of the mounting shaft (301). The coil receiving groove (303) is opened on the mounting plate (302), and there are multiple coil receiving grooves (303). The material taking rod (304) is fixedly connected to one side of the coil receiving groove (303); The unwinding member (4) is arranged between two adjacent material taking rods (304). The unwinding member (4) includes an electric telescopic rod (401), a sliding groove (402), a sliding rod (403), a connecting rod (404), a connecting block (405), an upper clamping plate (406), a lower clamping plate (407), a control switch (408), and a pressing plate (409); The electric telescopic rod (401) is fixedly connected to one of the mounting plates (302), the sliding groove (402) is opened on the other mounting plate (302), the sliding rod (403) is slidably connected to the sliding groove (402), the connecting rod (404) is fixedly connected between the sliding rod (403) and the output end of the electric telescopic rod (401). There are two connecting blocks (405), and the two connecting blocks (405) are respectively fixedly connected to the output end of the electric telescopic rod (401) and the end of the sliding rod (403) away from the sliding groove (402). The upper clamping plate (406) and the lower clamping plate (407) are respectively rotatably connected to the upper end and the lower end of the connecting block (405) through a rotating shaft. A torsion spring is fixedly connected between the rotating shaft and the upper clamping plate (406) and the lower clamping plate (407). The control switch (408) is arranged on the mounting plate (302), and the pressing plate (409) is fixedly connected to the support frame (101).

2. The automatic roll changing device for a flexographic printing press according to claim 1, characterized in that, The end of the material taking rod (304) away from the mounting plate (302) is bent in a hook shape, and the inner side surface of the material taking rod (304) is flush with the side wall of the coil receiving groove (303).

3. The automatic roll-changing device for a flexographic printing press according to claim 1, characterized in that, A servo motor (5) is fixedly installed on the workbench (1), and the output shaft of the servo motor (5) is fixedly connected to one end of the mounting shaft (301).

4. The automatic roll-changing device of a flexographic printing press according to claim 1, wherein, A unwinding plate (6) is fixedly connected to the workbench (1), and an extrusion inclined surface (7) is opened on one side of the unwinding plate (6) close to the coil (2).

5. The automatic roll changing device of a flexographic printing press according to claim 4, characterized in that, A coil receiving box (8) is arranged below the extrusion inclined surface (7). The coil receiving box (8) is fixedly connected to the workbench (1). The bottom of the coil receiving box (8) is inclined, and the lower end of the coil receiving box (8) is open.

6. The automatic roll changing device for a flexographic printing press according to claim 1, characterized in that, A loading box (9) is fixedly connected to the workbench (1). The top of the loading box (9) is funnel-shaped. A support platform (10) is fixedly connected to the bottom of the loading box (9). Both ends of the coil (2) are supported on the support platform (10). A limit block (11) is fixedly connected to the end of the support platform (10). The material of the limit block (11) is polyurethane.

7. An automatic roll changing device for a flexographic printing press according to claim 1, characterized in that, It further includes an installation table (12). An installation groove (13) is formed in the installation table (12). A pressure sensor (14) is arranged at the bottom of the installation groove (13). The pressure sensor (14) is connected to the servo motor (5) through a controller. A guide plate (15) is fixedly connected to the installation table (12).

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