A paper feeding mechanism for a flexographic printing press with adjustable tension

Abstract

The present invention relates to the technical field of flexographic printing presses, and particularly to a paper feeding mechanism for a flexographic printing press with adjustable tension, which includes a flexographic printing press body and a paper feeding rack arranged at the feeding end of the flexographic printing press body. A non-stop roll change mechanism is provided on the paper feeding rack. A pair of unwind reels are rotatably connected to the front side of the paper feeding rack, and air expandable shafts are fixedly connected to the front sides of the unwind reels. Bottom plates are fixedly connected to the front side of the paper feeding rack at positions corresponding to the positions on the far sides of the unwind reels. A material discharging table is fixedly connected to the front side of the paper feeding rack. Through the setting of the material discharging mechanism, the present invention can automatically push out the paper tube that has been unwound on the air expandable shaft. And through the mutual cooperation of the material loading mechanism and the driving mechanism, after the paper tube is pushed out, the storage frame can be pushed to slide on the material discharging table and the guide table, and then the paper roll is pushed onto the air expandable shaft. Then, the air expandable shaft can be started to tightly clamp the inner side of the paper roll, thus realizing the automatic loading and unloading of the device without the need for workers to pick up and place the paper roll, greatly improving the convenience performance of the device.

Description

Technical Field

[0001] The present invention relates to the technical field of flexographic printing presses, and in particular to a paper feeding mechanism for a flexographic printing press with adjustable tension. Background Art

[0002] A printing press is a machine for printing text and images. A flexographic printing press includes an unwinding paper feeding mechanism, a printing mechanism, a drying mechanism, and a rewinding and collecting mechanism. It uses a fluid ink with relatively strong fluidity. The ink is transferred from the ink fountain roller and the anilox roller to the graphic part of the printing plate to make it inked, and then the printing pressure is applied by the impression cylinder to transfer the ink on the printing plate to the substrate, and finally the printing process is completed through the drying surface.

[0003] In the prior art, a three-color electronic shaft printing press with non-stop rewinding, disclosed in CN115417203A, improves the feeding and rewinding of the existing printing press to achieve non-stop material change, greatly improving the working efficiency.

[0004] Although the above device realizes non-stop material change for the printing press through adjustable tension and improvement of feeding, there are still some defects in the actual production process. Since the paper feeding mechanism of this flexographic printing press lacks an automatic material change function, after the paper roll is completely unwound, workers still need to take out the empty cylinder, put it into the sundry box, then carry out the new paper roll from the transfer vehicle, insert it on the air shaft for installation, which is not only time-consuming and laborious, but also greatly reduces the convenience performance of the device and affects the production efficiency of the device.

[0005] Therefore, a paper feeding mechanism for a flexographic printing press with adjustable tension is proposed to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to solve the deficiencies in the background art, and a paper feeding mechanism for a flexographic printing press with adjustable tension is proposed.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows: a paper feeding mechanism for a flexographic printing press with adjustable tension, comprising a flexographic printing press body and a paper feeding rack provided at the feeding end of the flexographic printing press body. A non-stop roll change mechanism is provided on the paper feeding rack. A pair of unwind reels are rotatably connected to the front side of the paper feeding rack, and air expandable shafts are fixedly connected to the front sides of the unwind reels. Bottom plates are fixedly connected to the front side of the paper feeding rack at positions corresponding to the positions where the unwind reels are far away from each other. A feeding table is fixedly connected to the front side of the paper feeding rack, and the top end of the feeding table is inclined from the middle to both sides. Storage frames for storing paper rolls are slidably connected to both sides of the top end of the feeding table. Guide tables are fixedly connected to both ends of the rear side of the feeding table, and the top ends of the guide tables are inclined towards the middle. A fixed frame is fixedly connected to the side wall of the bottom plate. An L-shaped block is provided on the bottom plate. A feeding mechanism for loading the roll is provided at the bottom end of the storage frame. A blanking mechanism for the lower cylinder is provided on the bottom plate. A driving mechanism for driving the movement of the L-shaped block is provided inside the fixed frame.

[0008] In the above technical solution, further, the feeding mechanism includes a push plate. An L-shaped plate is fixedly connected to the bottom of the storage frame. The push plate is rotatably connected to the bottom end of the L-shaped plate. An inclined plate is fixedly connected to the rear side of the push plate in an inclined manner. A side plate is fixedly connected to the side wall of the guide table. A cavity is formed in the side wall of the storage frame. A return spring is fixedly connected between the side plate and the inner side of the cavity. An outlet for the paper roll is formed in the rear side of the storage frame corresponding to the position of the air expandable shaft.

[0009] In the above technical solution, further, an upper spring is fixedly connected between the side wall of the inclined plate and the inner side of the L-shaped plate. Guide grooves are formed at the top ends and the outer sides of the feeding table and the guide table. Guide blocks are fixedly connected to the inner sides of the storage frames corresponding to the positions of the guide grooves.

[0010] In the above technical solution, further, the driving mechanism includes a driving motor. The driving motor is fixedly connected to the side wall of the fixed frame. A threaded rod is rotatably connected to the inner side of the fixed frame. A sliding block is slidably connected to the inner side of the fixed frame. The threaded rod passes through and is threadedly connected to the inner side wall of the sliding block. A U-shaped frame is fixedly connected to the side wall of the sliding block. The L-shaped block is slidably connected to the inner side of the U-shaped frame. The output end of the driving motor passes through the inner side of the fixed frame and is fixedly connected to the side wall of the threaded rod.

[0011] In the above technical solution, further, the blanking mechanism includes a blanking ring sleeved outside the air shaft. The bottom end of the blanking ring is fixedly connected with a pushing frame, and the pushing frame is slidably connected to the outer wall of the guide table. A long straight groove is opened at the top end of the bottom plate. An upper inclined groove is opened on one side of the long straight groove close to the air shaft. A lower inclined groove is opened at the end of the long straight groove. An upper groove is opened at the rear end of the lower inclined groove. A lower groove is opened at the rear end of the upper inclined groove. A sliding cavity is opened inside the L-shaped block. A sliding rod is slidably connected inside the sliding cavity. The bottom end of the sliding rod passes through the bottom of the L-shaped block and is inserted into the inner side of the lower groove. A vertical groove is opened between the upper groove and the lower groove. A recessed groove is opened at the bottom end at the rear side of the long straight groove, and both ends of the recessed groove are inclined.

[0012] In the above technical solution, further, the bottom end of the sliding rod is provided with a smooth arc surface. A lower spring is fixedly connected between the inner side of the sliding cavity and the top end of the sliding rod. The upper inclined groove is arranged in the middle of the recessed groove.

[0013] In the above technical solution, further, an extrusion spring is fixedly connected between the inner side of the U-shaped frame and the side wall of the L-shaped block.

[0014] In the above technical solution, further, a pair of moving grooves are opened on the outer wall of the air shaft. Moving plates are slidably connected inside the moving grooves. A return spring is fixedly connected between the side wall of the moving plate and the inner side of the moving groove. A rotating ring is sleeved on the outer wall of the air shaft. The moving plate is fixedly connected to the inner side of the rotating ring. A rotating groove is opened inside the blanking ring. The rotating ring is rotatably connected inside the rotating groove.

[0015] In the above technical solution, further, collection boxes for collecting waste paper cylinders are provided on both sides of the guide table close to each other.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. Through the setting of the blanking mechanism, the present invention can automatically move the pushing blanking ring on the air shaft, and then push out the paper cylinder that has been unrolled on the air shaft, and then it falls onto the guide table and slides into the collection box along the inclined plane of the guide table. Subsequently, the L-shaped plate slides outwards under the drive of the upper inclined groove, thereby releasing the extrusion on the blanking ring, and then drives the blanking ring to reset under the elastic force of the return spring, which is convenient for subsequent automatic feeding.

[0018] 2. Through the mutual cooperation of the feeding mechanism and the driving mechanism, the present invention can, after pushing out the paper tube, continue to drive the L-shaped block to move, and then drive the L-shaped block beside the push plate. Since there is no restriction on the front side of the push plate, the L-shaped block can pass through the push plate. Then, when the driving mechanism drives the L-shaped block to reset, it can push the storage frame to slide on the feeding table and the guide table, and then push the paper roller onto the air shaft. Then, the air shaft can be started to tightly clamp the inner side of the paper roller. Subsequently, the L-shaped block moves away under the drive of the lower inclined groove, and then the storage frame is pulled back under the elastic force of the return spring, thus realizing the automatic feeding of the device without the need for workers to pick and place the paper roller, greatly improving the convenience performance of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a front three-dimensional structural schematic diagram of the flexographic printing machine of the present invention;

[0020] Figure 2 is a front three-dimensional structural schematic diagram of the paper feeding frame of the present invention;

[0021] Figure 3 is an attachment of the present invention Figure 2 partial enlarged structural schematic diagram at A in the figure;

[0022] Figure 4 is a partial top-down three-dimensional structural schematic diagram of the bottom plate and the feeding table of the present invention;

[0023] Figure 5 is an attachment of the present invention Figure 4 partial enlarged structural schematic diagram at B in the figure;

[0024] Figure 6 is an overall external structural schematic diagram of the push plate and the inclined plate of the present invention;

[0025] Figure 7 is a separated bottom-up three-dimensional structural schematic diagram of the feeding table and the storage frame of the present invention;

[0026] Figure 8 is a front fully-sectioned three-dimensional structural schematic diagram of the bottom plate of the present invention;

[0027] Figure 9 is a separated three-dimensional structural schematic diagram of the air shaft and the blanking ring of the present invention.

[0028] In the figure: 1. Flexographic printing press body; 2. Paper feeding rack; 3. Non-stop roll changing mechanism; 4. Unwinding reel; 5. Air shaft; 6. Bottom plate; 7. Feeding table; 8. Storage box; 9. Roll outlet; 10. Guide table; 11. Fixed frame; 12. Sliding block; 13. U-shaped frame; 14. L-shaped block; 15. Pushing plate; 16. L-shaped plate; 17. Inclined plate; 18. Side plate; 19. Return spring; 20. Driving motor; 21. Threaded rod; 22. Upper spring; 23. Guide groove; 24. Guide block; 25. Feeding ring; 26. Pushing frame; 27. Long straight groove; 28. Upper inclined groove; 29. Lower inclined groove; 30. Upper groove; 31. Lower groove; 32. Slide bar; 33. Vertical groove; 34. Groove; 35. Lower spring; 36. Extrusion spring; 37. Moving groove; 38. Moving plate; 39. Return spring; 40. Rotating ring; 41. Collection box. Detailed implementation manners

[0029] In order to be able to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the drawings and specific implementation manners.

[0030] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the present invention is not limited by the limitations of the specific embodiments disclosed below.

[0031] As Figures 1-9 shown, a paper feeding mechanism for a flexographic printing press with adjustable tension includes a flexographic printing press body 1. The working principle of the flexographic printing press body 1 is to transfer ink to the printing substrate through a flexible printing plate to complete the printing process, which is a mature technology in the prior art and will not be described in detail herein. And a paper feeding rack 2 is provided at the feeding end of the flexographic printing press body 1. A non-stop roll changing mechanism 3 is provided on the paper feeding rack 2. The non-stop roll changing mechanism 3 mainly makes the new roll ready and in a standby state when the old roll is about to run out. The linear speed of the new roll is synchronized with the running speed of the printing press through a control device. The front end of the new roll is bonded to the end of the old roll using a pressure roller or tape, and at the same time, the old roll is cut off. After the paper feeding is completed, the new roll starts to supply paper and the old roll stops rotating, thereby realizing seamless docking of the new and old rolls and ensuring that the printing process is uninterrupted. And a tension control system will be set in the non-stop roll changing mechanism 3. During the roll changing process of the printing press operation, due to the change of the roll diameter during roll changing, the difference in material properties, and the adjustment of the machine speed, the tension will change continuously. Through the tension adjustable system, the tension can be monitored and adjusted in real time to ensure the stability of the printing process;

[0032] A pair of unwind reels 4 are rotatably connected to the front side of the paper feed rack 2. Air shafts 5 are fixedly connected to the front sides of the unwind reels 4. Bottom plates 6 are fixedly connected to the positions on the front side of the paper feed rack 2 corresponding to the positions where the unwind reels 4 are far from each other. A feeding table 7 is fixedly connected to the front side of the paper feed rack 2, and the top end of the feeding table 7 is inclined from the middle to both sides, facilitating the paper rolls stored to slide to both sides. Storage frames 8 for storing paper rolls are slidably connected to both sides of the top end of the feeding table 7. Guide platforms 10 are fixedly connected to both ends of the rear side of the feeding table 7, and the top ends of the guide platforms 10 are inclined towards the middle, facilitating the waste paper cylinders pushed out to slide into the collection box 41. A fixed frame 11 is fixedly connected to the side wall of the bottom plate 6. An L-shaped block 14 is provided on the bottom plate 6. A feeding mechanism for loading the upper roll is provided at the bottom end of the storage frame 8. A blanking mechanism for unloading the lower cylinder is provided on the bottom plate 6. A driving mechanism for driving the movement of the L-shaped block 14 is provided inside the fixed frame 11.

[0033] The driving mechanism includes a driving motor 20. The driving motor 20 is fixedly connected to the side wall of the fixed frame 11. A threaded rod 21 is rotatably connected inside the fixed frame 11. A sliding block 12 is slidably connected inside the fixed frame 11. The threaded rod 21 penetrates and is threadedly connected to the inner side wall of the sliding block 12. A U-shaped frame 13 is fixedly connected to the side wall of the sliding block 12. The L-shaped block 14 is slidably connected inside the U-shaped frame 13. The output end of the driving motor 20 passes through the inside of the fixed frame 11 and is fixedly connected to the side wall of the threaded rod 21.

[0034] The feeding mechanism includes a push plate 15. An L-shaped plate 16 is fixedly connected to the bottom of the storage frame 8. The push plate 15 is rotatably connected to the bottom end of the L-shaped plate 16. An inclined plate 17 is fixedly connected to the rear side of the push plate 15 in an inclined manner. A side plate 18 is fixedly connected to the side wall of the guide platform 10. Here, it should be noted that the setting of the side plate 18 will not hinder the normal movement of the pushing frame 26. Since the front side of the storage frame 8 is in a protruding state, the position where the side plate 18 slides into the storage frame 8 is restricted and lengthened. Therefore, the sliding distance of the storage frame 8 will increase, so that the side plate 18 can be set in a place that does not hinder the movement of the pushing frame 26. A cavity is formed in the side wall of the storage frame 8. A return spring 19 is fixedly connected between the side plate 18 and the inner side of the cavity. An outlet 9 corresponding to the air shaft 5 is provided at the rear side of the storage frame 8, facilitating the paper roll corresponding to the air shaft 5 to be inserted, realizing the feeding of the device.

[0035] A upper spring 22 is fixedly connected between the side wall of the inclined plate 17 and the inner side of the L-shaped plate 16, facilitating the pulling of the inclined plate 17 and the push plate 15 to reset. Guide grooves 23 are formed at the top ends and the outer sides of the feeding table 7 and the guide platform 10. Guide blocks 24 are fixedly connected to the positions corresponding to the guide grooves 23 inside the storage frame 8. Through the setting of the guide grooves 23 and the guide blocks 24, the sliding of the storage frame 8 can be guided, ensuring the stability during the feeding process.

[0036] During use, first, the paper rolls on the material cart are pushed one by one onto the feeding table 7 and placed flat in the storage frame 8 (and the feeding table 7 can be aligned with the production conveyor line, enabling the paper rolls after production to be automatically conveyed onto the feeding table 7 and roll down to both sides). Subsequently, when loading the paper rolls, the driving motor 20 is controlled to start, driving the threaded rod 21 to rotate, thereby driving the sliding block 12 connected by threads to slide, further driving the U-shaped frame 13 and the L-shaped block 14 to move (the L-shaped block 14 at the initial position can be located at the rear end of the long straight groove 27). At the same time, the sliding rod 32 is driven to slide inside the long straight groove 27, and then the L-shaped block 14 is driven to move beside the push plate 15. Since there is no restriction on the front side of the push plate 15, under the push of the L-shaped block 14, the push plate 15 will be driven to rotate around the hinge, and at the same time, the inclined plate 17 will be driven to flip and stretch the upper spring 22. Subsequently, when the L-shaped block 14 moves away from beside the push plate 15, the inclined plate 17 and the push plate 15 will be pulled to flip and reset under the elastic force of the upper spring 22. Then, the driving motor 20 is controlled to reverse, driving the sliding block 12, the U-shaped frame 13, and the L-shaped block 14 to move in the reverse direction for resetting. When the L-shaped block 14 moves beside the push plate 15, since the rear side of the push plate 15 is restricted by the inclined plate 17 and cannot flip backward, under the thrust of the L-shaped block 14, the push plate 15 and the storage frame 8 are pushed to slide on the feeding table 7;

[0037] The storage frame 8 is slid onto the guide table 10, gradually compressing the return spring 19. Subsequently, the storage frame 8 is driven to move below the air shaft 5, and then the paper roll is inserted onto the air shaft 5. At the same time, the sliding rod 32 is driven to slide to the other end of the long straight groove 27 and be located above the groove 34. Then, under the elastic force of the lower spring 35, the bottom end of the sliding rod 32 is pushed into the groove 34 (thereby restricting the sliding rod 32 from sliding into the upper inclined groove 28). Subsequently, under the continuous push of the sliding block 12, the sliding rod 32 slides out of the groove 34 and compresses the lower spring 35 upward. Then, the sliding rod 32 slides into the lower inclined groove 29 and pulls the L-shaped block 14 to slide, gradually compressing the extrusion spring 36. At this time, the air shaft 5 can be controlled to start to clamp the paper roll (it should be noted here that the position where the air shaft 5 starts to clamp the paper roll can be set through a position sensor to ensure that when the L-shaped block 14 moves to a certain distance, the air shaft 5 is accurately controlled to start, ensuring that the paper roll does not reset with the storage frame 8 and does not hinder the continuous movement of the L-shaped block 14). At the same time, the L-shaped block 14 will move away from beside the push plate 15, thereby releasing the push on the storage frame 8. Subsequently, under the elastic force of the return spring 19, the storage frame 8 is pulled to reset, thus realizing the automatic feeding of the device. Finally, the paper roll in the storage frame 8 rolls down to the unwinding port 9 under its own gravity. Subsequently, the operator can pull out the paper on the paper roll clamped on the air shaft 5 and pull it to the non-stop roll change mechanism 3, so that when another paper roll is used up, the flexographic printing machine can be changed rolls without stopping.

[0038] In order to achieve automatic blanking of the device, the blanking mechanism includes a blanking ring 25 sleeved outside the air shaft 5. A pushing frame 26 is fixedly connected to the bottom end of the blanking ring 25, and the pushing frame 26 is slidably connected to the outer wall of the guide table 10. A long straight groove 27 is opened at the top end of the bottom plate 6. An upper inclined groove 28 is opened on one side of the long straight groove 27 close to the air shaft 5. A lower inclined groove 29 is opened at the end of the long straight groove 27. An upper groove 30 is opened at the rear end of the lower inclined groove 29. A lower groove 31 is opened at the rear end of the upper inclined groove 28. A sliding cavity is opened inside the L-shaped block 14. A sliding rod 32 is slidably connected to the inner side of the sliding cavity, and the bottom end of the sliding rod 32 passes through the bottom of the L-shaped block 14 and is inserted into the inner side of the lower groove 31. A vertical groove 33 is opened between the upper groove 30 and the lower groove 31. A recessed groove 34 is opened at the bottom end at the rear side of the long straight groove 27. Both ends of the groove 34 are inclined, facilitating the sliding rod 32 to slide out of the groove 34 and move along the specified route;

[0039] The bottom end of the sliding rod 32 is provided with a smooth arc surface, facilitating the sliding rod 32 to slide out of the groove 34. A lower spring 35 is fixedly connected between the inner side of the sliding cavity and the top end of the sliding rod 32. The upper inclined groove 28 is arranged in the middle of the groove 34. An extrusion spring 36 is fixedly connected between the inner side of the U-shaped frame 13 and the side wall of the L-shaped block 14. Through the arrangement of the extrusion spring 36, it is convenient to push the L-shaped block 14 to reset. Collection boxes 41 for collecting waste paper cylinders are provided on both sides of the guide table 10 close to each other;

[0040] When the paper roll on the air shaft 5 is completely unrolled, the driving motor 20 can be controlled to start and drive the threaded rod 21 to rotate, then drive the sliding block 12 connected by threads to slide, further drive the U-shaped frame 13 and the L-shaped block 14 to move, and drive the sliding rod 32 to slide out of the lower inclined groove 29 and slide into the upper groove 30. Subsequently, driven by the sliding block 12, the sliding rod 32 is driven to the rear end of the upper groove 30, thereby releasing the extrusion on the L-shaped block 14. Then, under the elastic force of the extrusion spring 36, the L-shaped block 14 is pushed to reset, and at the same time, the sliding rod 32 is driven to slide in the vertical groove 33, and at the same time, the L-shaped block 14 is driven to be inserted into the rear side of the pushing frame 26, and then the sliding rod 32 slides into the lower groove 31;

[0041] Subsequently, the driving motor 20 can be controlled to reverse, driving the slider 12, U-shaped frame 13 and L-shaped block 14 to move in the reverse direction, and then driving the L-shaped block 14 to move to the rear side of the pushing frame 26, pushing the pushing frame 26 and the blanking ring 25 to move, thereby pushing out the paper tube on the air shaft 5. At the same time, it drives the rotating ring 40 and the moving plate 38 to slide inside the moving groove 37, gradually compresses the return spring 39, and drives the sliding rod 32 to slide inside the lower groove 31. Then, when the paper tube is about to be pushed out from the air shaft 5, the sliding rod 32 will slide out of the lower groove 31 and into the upper inclined groove 28, thereby squeezing the L-shaped block 14 to move and gradually compressing the compression spring 36. Then, the sliding rod 32 slides out of the upper inclined groove 28 and into the long straight groove 27, and under the elastic force of the lower spring 35, the bottom end of the sliding rod 32 is pushed into the groove 34 (the sliding rod 32 can be restricted from sliding into the upper inclined groove 28 through the groove 34). At the same time, the blanking ring 25 will completely push out the paper tube from the air shaft 5. Then, the L-shaped block 14 moves away from beside the pushing frame 26, thereby releasing the thrust on the pushing frame 26. Then, under the elastic force of the return spring 39, the blanking ring 25 is pushed to reset. At the same time, the pushed paper tube falls onto the guide table 10, and then slides into the collection box 41 under its own gravity for centralized collection and processing.

[0042] To ensure the normal operation of the blanking mechanism, a pair of moving grooves 37 are provided on the outer wall of the air shaft 5. The inner sides of the moving grooves 37 are both slidably connected with moving plates 38. A return spring 39 is fixedly connected between the side wall of the moving plate 38 and the inner side of the moving groove 37. Through the setting of the return spring 39, when the pushing frame 26 is released from the thrust, it is convenient to push the moving plate 38, the rotating ring 40 and the blanking ring 25 to reset by the elastic force of the return spring 39. A rotating ring 40 is sleeved on the outer wall of the air shaft 5. The moving plate 38 is fixedly connected to the inner side of the rotating ring 40. A rotating groove is provided inside the blanking ring 25. The rotating ring 40 is rotatably connected to the inner side of the rotating groove. And through the setting of the rotating ring 40 and the rotating groove, since the pushing frame 26 is slidably connected to the guide table 10 and is restricted from rotating, when the air shaft 5 rotates, it will drive the moving plate 38 and the rotating ring 40 to rotate inside the rotating groove, thus not affecting the normal unwinding of the device.

[0043] The above shows and describes the basic principles, main features and advantages of the present invention.

[0044] Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A tension-adjustable paper feed mechanism for a flexographic printing press, comprising a flexographic printing press body (1), and a paper feed rack (2) arranged at a feeding end of the flexographic printing press body (1), wherein a non-stop roll changing mechanism (3) is provided on the paper feed rack (2), characterized in that: The front side of the paper feed rack (2) is rotatably connected to a pair of unwinding discs (4), the front sides of the unwinding discs (4) are fixedly connected to an inflatable shaft (5), the front side of the paper feed rack (2) is fixedly connected to a bottom plate (6) at a position corresponding to a side away from the unwinding disc (4), the front side of the paper feed rack (2) is fixedly connected to a material unwinding platform (7), and the top of the material unwinding platform (7) is inclined from the middle to both sides, and both sides of the top of the material unwinding platform (7) are slidably connected to storage frames (8) for storing paper rolls. The two ends of the rear side of the unloading platform (7) are fixedly connected to a guide platform (10), and the top of the guide platform (10) is inclined toward the middle, the side wall of the bottom plate (6) is fixedly connected to a fixed frame (11), the bottom plate (6) is provided with an L-shaped block (14), the bottom end of the storage frame (8) is provided with a loading mechanism for rolling up, the bottom plate (6) is provided with a unloading mechanism for unloading, and the inner side of the fixed frame (11) is provided with a driving mechanism for driving the L-shaped block (14) to move; The feeding mechanism comprises a push plate (15), an L-shaped plate (16) is fixedly connected to the bottom of the storage frame (8), the push plate (15) is rotatably connected to the bottom end of the L-shaped plate (16), the rear side of the push plate (15) is tilted and fixedly connected to an inclined plate (17), the side wall of the guide platform (10) is fixedly connected to a side plate (18), a cavity is provided on the side wall of the storage frame (8), a return spring (19) is fixedly connected between the side plate (18) and the inner side of the cavity, and a roll outlet (9) is provided on the rear side of the storage frame (8) at a position corresponding to the inflatable shaft (5); The guide platform (10) is provided with a collection box (41) for collecting waste paper rolls on one side thereof; The material discharging mechanism comprises a material discharging ring (25) sleeved on the outside of the inflatable shaft (5), the bottom end of the material discharging ring (25) is fixedly connected to a pushing frame (26), and the pushing frame (26) is slidably connected to the outer wall of the guide platform (10), the top end of the bottom plate (6) is provided with a long straight groove (27), the long straight groove (27) is provided with an upper inclined groove (28) on the side close to the inflatable shaft (5), the end of the long straight groove (27) is provided with a lower inclined groove (29), and the rear end of the lower inclined groove (29) is provided with an upper A lower groove (31) is provided at the rear end of the upper inclined groove (28), a sliding cavity is provided inside the L-shaped block (14), a sliding rod (32) is slidably connected to the inner side of the sliding cavity, and the bottom end of the sliding rod (32) passes through the bottom of the L-shaped block (14) and is inserted into the inner side of the lower groove (31), a vertical groove (33) is provided between the upper groove (30) and the lower groove (31), and an inwardly sunken groove (34) is provided at the bottom end of the rear side of the long straight groove (27), and the two ends of the groove (34) are inclined.

2. The tension-adjustable paper feeding mechanism for a flexographic printing press according to claim 1, characterized in that: An upper spring (22) is fixedly connected between the side wall of the inclined plate (17) and the inner side of the L-shaped plate (16); guide grooves (23) are provided at the top and outer sides of the unloading platform (7) and the guide platform (10); and guide blocks (24) are fixedly connected to the inner side of the storage frame (8) at positions corresponding to the guide grooves (23).

3. The tension-adjustable paper feeding mechanism for a flexographic printing press according to claim 1, characterized in that: The driving mechanism comprises a driving motor (20), the driving motor (20) being fixedly connected to a side wall of a fixed frame (11), a threaded rod (21) being rotatably connected to the inner side of the fixed frame (11), a sliding block (12) being slidably connected to the inner side of the fixed frame (11), the threaded rod (21) being threadedly connected to the inner side wall of the sliding block (12), a U-shaped frame (13) being fixedly connected to the side wall of the sliding block (12), the L-shaped block (14) being slidably connected to the inner side of the U-shaped frame (13), and an output end of the driving motor (20) passing through the inner side of the fixed frame (11) and being fixedly connected to the side wall of the threaded rod (21).

4. The tension-adjustable paper feeding mechanism for a flexographic printing press according to claim 1, characterized in that: The bottom end of the slide rod (32) is arranged as a smooth arc surface, a lower spring (35) is fixedly connected between the inner side of the slide cavity and the top end of the slide rod (32), and the upper inclined groove (28) is arranged in the middle of the groove (34).

5. The tension-adjustable paper feeding mechanism for a flexographic printing press according to claim 3, characterized in that: A compression spring (36) is fixedly connected between the inner side of the U-shaped frame (13) and the side wall of the L-shaped block (14).

6. The tension-adjustable paper feeding mechanism for a flexographic printing press according to claim 1, characterized in that: The outer wall of the inflatable shaft (5) is provided with a pair of movable grooves (37), the inner sides of the movable grooves (37) are slidably connected with movable plates (38), a return spring (39) is fixedly connected between the side wall of the movable plate (38) and the inner side of the movable groove (37), the outer wall of the inflatable shaft (5) is sleeved with a rotating ring (40), the movable plate (38) is fixedly connected to the inner side of the rotating ring (40), the inner side of the unloading ring (25) is provided with a rotating groove, and the rotating ring (40) is rotatably connected to the inner side of the rotating groove.

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