Tension-adjustable paper feeding mechanism for flexo printing machine

Abstract

The invention relates to the technical field of flexo printing machines, in particular to a tension-adjustable paper feeding mechanism for a flexo printing machine, which comprises a flexo printing machine body and a paper feeding frame arranged at the feeding end of the flexo printing machine body, a non-stop roll changing mechanism is arranged on the paper feeding frame, and a pair of unwinding discs is rotatably connected to the front side of the paper feeding frame. The front sides of the unwinding discs are fixedly connected with air expansion shafts, the positions, corresponding to the sides away from the unwinding discs, of the front side of the paper feeding frame are fixedly connected with bottom plates, and the front side of the paper feeding frame is fixedly connected with a discharging table. Under the mutual cooperation of the feeding mechanism and the driving mechanism, after a paper tube is pushed out, a storage frame can be pushed to slide on a discharging table and a guide table, then a paper roller is pushed to an air expansion shaft, the air expansion shaft can be started to tightly support and clamp the inner side of the paper roller, automatic feeding and discharging of the device are achieved, workers do not need to take and place the paper roller, and the working efficiency is improved. And the convenience of the device is greatly improved.

Description

Technical Field

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

[0002] A printing press is a machine for printing text and images. A flexographic printing press includes a paper unwinding mechanism, a printing mechanism, a drying mechanism, and a rewinding mechanism. It uses fluid ink with high fluidity. The ink is transferred to the image part of the printing plate by the ink fountain rubber roller and the anilox transfer roller to make it inked. Then the pressure roller applies printing pressure 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, there is a three-color electronic axis printing machine with non-stop winding, which has a publication number of CN115417203A. By improving the feeding and receiving of the existing printing machine, the material can be changed without stopping, which greatly improves the working efficiency.

[0004] Although the above-mentioned device realizes non-stop material changing of the printing press through adjustable tension and improvement of material feeding, there are still some defects in the actual production process. Since the paper feeding mechanism of the flexographic printing press lacks automatic material changing function, after the paper roll is unrolled, the worker needs to take out the empty tube and put it in the debris box, and then move the new paper roll from the transfer vehicle and insert it on the expansion roller for installation. This is not only time-consuming and labor-intensive, but also greatly reduces the convenience of the device and affects the production efficiency of the device.

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

[0006] The purpose of the present invention is to solve the shortcomings of the background technology and to propose a tension-adjustable paper feeding mechanism for a flexographic printing press.

[0007] To achieve the above purpose, the technical solution adopted by the present invention is: a tension-adjustable paper feeding mechanism for a flexographic printing machine, comprising a flexographic printing machine body, and a paper feeding rack arranged at the feeding end of the flexographic printing machine body, the paper feeding rack is provided with a non-stop roll changing mechanism, a pair of unwinding discs are rotatably connected to the front side of the paper feeding rack, the front sides of the unwinding discs are fixedly connected with an air shaft, the front side of the paper feeding rack corresponding to the position away from the unwinding disc is fixedly connected with a bottom plate, the front side of the paper feeding rack is fixedly connected with a discharge table, and the top of the discharge table is inclined from the middle to both sides, the top sides of the discharge table are slidably connected with storage frames for storing paper rolls, the two ends of the rear side of the discharge table are fixedly connected with guide platforms, and the tops of the guide platforms are inclined toward the middle, the side walls of the bottom plate are fixedly connected with a fixed frame, the bottom plate is provided with an L-shaped block, the bottom end of the storage frame is provided with a loading mechanism for rolling up, the bottom plate is provided with a unloading mechanism for unloading, and the inner side of the fixed frame is provided with a driving mechanism for driving the L-shaped block to move.

[0008] In the above technical solution, further, the loading 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, the rear side of the push plate is tilted and fixedly connected to an inclined plate, the side wall of the guide platform is fixedly connected to a side plate, a cavity is opened 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, and a roll outlet is opened at the rear side of the storage frame corresponding to the position of the inflatable 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 provided on the top and outer sides of the discharge table and the guide table, and guide blocks are fixedly connected to the inner side of the storage frame at positions corresponding to 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, the inner side of the fixed frame is rotatably connected to a threaded rod, the inner side of the fixed frame is slidably connected to a sliding block, the threaded rod is threadedly connected to the inner side wall of the sliding block, the side wall of the sliding block is fixedly connected to a U-shaped frame, the L-shaped block is slidably connected to the inner side of the U-shaped frame, and 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 scheme, further, the unloading mechanism includes a unloading ring which is sleeved on the outside of the inflatable shaft, the bottom end of the unloading ring is fixedly connected to a pushing frame, and the pushing frame is slidably connected to the outer wall of the guide platform, a long straight groove is provided at the top of the bottom plate, an upper inclined groove is provided on the side of the long straight groove close to the inflatable shaft, a lower inclined groove is provided at the end of the long straight groove, an upper groove is provided at the rear end of the lower inclined groove, and a lower groove is provided at the rear end of the upper inclined groove, a sliding cavity is provided inside the L-shaped block, a sliding rod is slidably connected to the inside of the sliding cavity, and 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 provided between the upper groove and the lower groove, an inward-recessed groove is provided at the bottom end of the rear side of the long straight groove, and the two ends of the groove are inclined.

[0012] In the above technical solution, further, the bottom end of the slide rod is set to a smooth arc surface, a lower spring is fixedly connected between the inner side of the slide cavity and the top end of the slide rod, and the upper inclined groove is set in the middle of the groove.

[0013] In the above technical solution, further, a compression 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 movable grooves are opened on the outer wall of the inflatable shaft, and movable plates are slidably connected to the inner sides of the movable grooves, and a return spring is fixedly connected between the side walls of the movable plates and the inner sides of the movable grooves. A rotating ring is sleeved on the outer wall of the inflatable shaft, and the movable plate is fixedly connected to the inner side of the rotating ring. A rotating groove is opened on the inner side of the unloading ring, and the rotating ring is rotatably connected to the inner side of the rotating groove.

[0015] In the above technical solution, further, the guide platform is provided with a collection box for collecting waste paper rolls on one side close to the guide platform.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention can automatically push the unloading ring to move on the air shaft through the setting of the unloading mechanism, thereby pushing out the unrolled paper tube on the air shaft, and then dropping it onto the guide platform, sliding it into the collection box along the inclined surface of the guide platform, and then the L-shaped plate slides outward under the drive of the upper inclined groove, thereby releasing the squeezing of the unloading ring, and then driving the unloading ring to reset under the elastic force of the return spring, so as to facilitate the subsequent automatic loading.

[0017] 2. The present invention can continue to drive the L-shaped block to move after the paper roll is pushed out through the cooperation between the feeding mechanism and the driving mechanism, and then drive the L-shaped block to the side of 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. When the driving mechanism drives the L-shaped block to reset, the storage frame can be pushed to slide on the unloading table and the guide table, and then the paper roll can be pushed onto the air shaft, and the air shaft can be started to clamp the inner side of the paper roll. Then the L-shaped block is moved away under the drive of the lower inclined groove, and then the storage frame is pulled to reset under the elastic force of the reset spring, thereby realizing automatic feeding of the device without the need for workers to take and place the paper roll, greatly improving the convenience of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the front three-dimensional structure of the flexographic printing machine of the present invention; Figure 2 It is a schematic diagram of the front three-dimensional structure of the paper feed rack of the present invention; Figure 3 The appended Figure 2 A schematic diagram of the partially enlarged structure at center A; Figure 4 It is a partial top view of the three-dimensional structure of the bottom plate and the unloading platform of the present invention; Figure 5 The appended Figure 4 A schematic diagram of the partially enlarged structure at B in the middle; Figure 6 It is a schematic diagram of the overall appearance structure of the push plate and the inclined plate of the present invention; Figure 7 This is a schematic diagram of a three-dimensional structure of a material unloading platform and a storage frame separated from each other when viewed from above; Figure 8 It is a schematic diagram of the full-cut three-dimensional structure of the front side of the bottom plate of the present invention; Fig. 9 It is a schematic diagram of the three-dimensional structure of the inflatable shaft and the blanking ring separated according to the present invention.

[0019] Figure: 1. Flexographic printing machine body; 2. Paper feed rack; 3. Non-stop reel changing mechanism; 4. Unwinding reel; 5. Air shaft; 6. Bottom plate; 7. Unwinding table; 8. Storage frame; 9. Unwinding port; 10. Guide table; 11. Fixed frame; 12. Sliding block; 13. U-shaped frame; 14. L-shaped block; 15. Push plate; 16. L-shaped plate; 17. Inclined plate; 18. Side plate; 19. Reset spring; 20. Driving motor; 2 1. Threaded rod; 22. Upper spring; 23. Guide groove; 24. Guide block; 25. Unloading ring; 26. Push frame; 27. Long straight groove; 28. Upper inclined groove; 29. ​​Lower inclined groove; 30. Upper groove; 31. Lower groove; 32. Sliding rod; 33. Vertical groove; 34. Groove; 35. Lower spring; 36. Extrusion spring; 37. Moving groove; 38. Moving plate; 39. Return spring; 40. Rotating ring; 41. Collecting box. DETAILED DESCRIPTION

[0020] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] like Figure 1-9 The flexographic printing machine shown in the figure has a tension-adjustable paper feeding mechanism, including a flexographic printing machine body 1. The working principle of the flexographic printing machine body 1 is to transfer ink to a 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 here. There is also a paper feeding rack 2 arranged at the feeding end of the flexographic printing machine body 1. The paper feeding rack 2 is provided with a non-stop roll changing mechanism 3. The non-stop roll changing mechanism 3 is mainly used when the old roll is about to be used up and the new roll is ready and in a standby state. The linear speed of the new roll is adjusted to the running speed of the printing machine through a control device. The front end of the new coil is bonded to the end of the old coil by a pressure roller or adhesive tape, and the old coil is cut off at the same time. After the paper splicing is completed, the new coil starts to feed paper and the old coil stops rotating, thereby achieving seamless connection between the new and old coils and ensuring that the printing process is uninterrupted. A tension control system will be set in the roll changing mechanism 3 without stopping the machine. During the roll changing process of the printing machine, the tension will change continuously due to the change of the roll diameter, the difference in material properties and the adjustment of the machine speed during the roll changing process. The tension can be monitored and adjusted in real time through the tension adjustable system to ensure the stability of the printing process. A pair of unwinding discs 4 are rotatably connected to the front side of the paper feed rack 2, and an inflatable shaft 5 is fixedly connected to the front side of the unwinding discs 4. A bottom plate 6 is fixedly connected to the front side of the paper feed rack 2 corresponding to the side away from the unwinding disc 4. A feeding table 7 is fixedly connected to the front side of the paper feed rack 2, and the top of the feeding table 7 is tilted from the middle to both sides, so that the stored paper rolls can slide to both sides. Storage frames 8 for storing paper rolls are slidably connected to both sides of the top 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 tops of the guide platforms 10 are tilted toward the middle, so that the pushed-out waste paper tubes can slide into the collection box 41. A fixed frame 11 is fixedly connected to the side wall of the bottom plate 6, and an L-shaped block 14 is provided on the bottom plate 6. A loading mechanism for the upper roll is provided at the bottom end of the storage frame 8, and a unloading mechanism for the lower roll is provided on the bottom plate 6. A driving mechanism for driving the L-shaped block 14 to move is provided on the inner side of the fixed frame 11.

[0023] The driving mechanism includes a driving motor 20, which is fixedly connected to the side wall of the fixed frame 11, a threaded rod 21 is rotatably connected to the inner side of the fixed frame 11, a sliding block 12 is slidably connected to the inner side of 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, an L-shaped block 14 is slidably connected to the inner side of the U-shaped frame 13, and an output end of the driving motor 20 passes through the inner side of the fixed frame 11 and is fixedly connected to the side wall of the threaded rod 21; 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, the rear side of the push plate 15 is tilted and fixedly connected to an inclined plate 17, and the side wall of the guide platform 10 is fixedly connected to a side plate 18. It should be noted here that the setting of the side plate 18 will not hinder the normal movement of the push 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 is lengthened, so the sliding distance of the storage frame 8 will increase, so that the side plate 18 can be set at a place that does not hinder the movement of the push frame 26. A cavity is opened on the side wall of the storage frame 8, and a return spring 19 is fixedly connected between the side plate 18 and the inner side of the cavity, and a roll-out port 9 is opened on the rear side of the storage frame 8 corresponding to the position of the inflatable shaft 5, which is convenient for inserting the paper roller corresponding to the inflatable shaft 5 to realize the feeding of the device; 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, so as to facilitate pulling the inclined plate 17 and the push plate 15 to reset. 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 corresponding positions of the guide grooves 23 on the inner side of the storage frame 8. The setting of the guide grooves 23 and the guide blocks 24 can guide the sliding of the storage frame 8 to ensure the stability during the loading process. When in use, first push the paper rolls on the material cart onto the unloading table 7 one by one and place them flat in the storage frame 8 (and the unloading table 7 can be aligned with the production conveyor line, so that the produced paper rolls can be automatically transported to the unloading table 7 and roll down to both sides), and then when loading the paper rolls, the drive motor 20 is controlled to start and drive the threaded rod 21 to rotate, thereby driving the threaded sliding block 12 to slide, and then driving the U-shaped frame 13 and the L-shaped block 14 to move (the L-shaped block 14 in the initial position can be located at the rear end of the long straight groove 27), and at the same time drive the sliding rod 32 to slide inside the long straight groove 27, thereby driving the L-shaped block 14 to move to the side of the push plate 15. The front side of the push plate 15 is not restricted, and then under the push of the L-shaped block 14, the push plate 15 is driven to rotate around the hinge, and at the same time, the inclined plate 17 is driven to flip and the upper spring 22 is stretched. Then, when the L-shaped block 14 moves away from the push plate 15, the inclined plate 17 and the push plate 15 are pulled under the elastic force of the upper spring 22 to flip and reset, and then the drive motor 20 is controlled to reverse, and the sliding block 12, the U-shaped frame 13 and the L-shaped block 14 are driven to move in the opposite direction to reset. When the L-shaped block 14 moves to the side of the push plate 15, the rear side of the push plate 15 is restricted by the inclined plate 17 and cannot flip backwards. Then, under the thrust of the L-shaped block 14, the push plate 15 and the storage frame 8 are pushed to slide on the unloading table 7; The storage frame 8 is made to slide onto the guide platform 10, and the return spring 19 is gradually compressed, and then the storage frame 8 is driven to move to the bottom of the air shaft 5, and then the paper roll is inserted into the air shaft 5. At the same time, the slide bar 32 is driven to slide to the other end of the long straight groove 27 and is located above the groove 34, and then the bottom end of the slide bar 32 is pushed into the groove 34 under the elastic force of the lower spring 35 (thereby limiting the slide bar 32 from sliding into the upper inclined groove 28). Then, under the continued push of the sliding block 12, the slide bar 32 is driven to slide out of the groove 34, and the lower spring 35 is compressed upward, and then the slide bar 32 is made to slide into the lower inclined groove 29, and the L-shaped block 14 is pulled to slide, and the extrusion spring 36 is gradually compressed. At this time, the air shaft 5 can be controlled to start clamping the paper roll (it should be noted here that The position of the paper roller clamped by the pneumatic shaft 5 can be started by setting a position sensor to ensure that when the L-shaped block 14 moves to the distance position, the pneumatic shaft 5 is accurately controlled to start, which can ensure that the paper roller does not follow the storage frame 8 to reset, and will not hinder the continued movement of the L-shaped block 14). At the same time, the L-shaped block 14 will move away from the push plate 15, thereby releasing the push on the storage frame 8, and then the storage frame 8 will be pulled to reset under the elastic force of the reset spring 19, thereby realizing automatic loading of the device. Finally, the paper roller in the storage frame 8 rolls to the roll outlet 9 under its own gravity. Then the staff can pull the paper on the paper roller clamped by the pneumatic shaft 5 out and pull it to the non-stop roll changing mechanism 3, so that the flexographic printing machine can be changed without stopping when the other paper roller is used up.

[0024] In order to realize automatic unloading of the device, the unloading mechanism includes an unloading ring 25 sleeved on the outside of the inflatable shaft 5, the bottom end of the unloading 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, a long straight groove 27 is provided at the top of the bottom plate 6, and an upper inclined groove 28 is provided on the side of the long straight groove 27 close to the inflatable shaft 5, a lower inclined groove 29 is provided at the end of the long straight groove 27, an upper groove 30 is provided at the rear end of the lower inclined groove 29, and 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 inside 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 indented 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 to facilitate the sliding rod 32 to slide out of the groove 34 and move along the specified route; The bottom end of the slide bar 32 is set as a smooth arc surface, which is convenient for the slide bar 32 to slide out of the groove 34. A lower spring 35 is fixedly connected between the inner side of the slide cavity and the top of the slide bar 32. The upper inclined groove 28 is set 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. The setting of the extrusion spring 36 facilitates pushing the L-shaped block 14 to reset. A collection box 41 for collecting waste paper tubes is provided on the side close to the guide platform 10. When the paper roll on the inflatable shaft 5 is unwound, the driving motor 20 can be controlled to start and drive the threaded rod 21 to rotate, thereby driving the threaded sliding block 12 to slide, thereby driving the U-shaped frame 13 and the L-shaped block 14 to move, and driving the sliding rod 32 to slide out of the lower inclined groove 29 and slide into the upper groove 30, and then driven by the sliding block 12 to drive the sliding rod 32 to move to the rear end of the upper groove 30, thereby releasing the squeeze on the L-shaped block 14, and then pushing the L-shaped block 14 to reset under the elastic force of the squeezing spring 36, while driving the sliding rod 32 to slide in the vertical groove 33, and at the same time driving the L-shaped block 14 to insert into the rear side of the pushing frame 26, and then the sliding rod 32 slides into the lower groove 31; Then, the driving motor 20 can be controlled to reverse, drive the sliding block 12, the U-shaped frame 13 and the L-shaped block 14 to move in the opposite direction, and then drive the L-shaped block 14 to move to the rear side of the pushing frame 26, push the pushing frame 26 and the unloading ring 25 to move, and then push the paper tube on the inflatable shaft 5 out, and at the same time drive the rotating ring 40 and the moving plate 38 to slide inside the moving groove 37, and gradually compress the return spring 39, and drive the sliding rod 32 to slide in the lower groove 31, and then when the paper tube is about to be pushed out from the inflatable shaft 5, the sliding rod 32 will slide out of the lower groove 31 and slide into the upper inclined groove 28, thereby squeezing the L-shaped block 14 to move, and The squeezing spring 36 is gradually compressed, and the slide bar 32 slides out of the upper inclined groove 28 and into the long straight groove 27, and the bottom end of the slide bar 32 is pushed into the groove 34 under the elastic force of the lower spring 35 (the groove 34 can limit the slide bar 32 from sliding into the upper inclined groove 28). At the same time, the unloading ring 25 will completely push the paper tube onto the inflatable shaft 5, and the L-shaped block 14 will move out from the side of the pushing frame 26, thereby releasing the thrust on the pushing frame 26, and then the unloading ring 25 is pushed to reset under the elastic force of the return spring 39, and the pushed paper tube falls onto the guide platform 10, and then slides into the collection box 41 under its own gravity for centralized collection and processing.

[0025] The cam 37 is provided with a plurality of movable grooves 37, each of which is slidably connected to a movable plate 38 inside the movable grooves 37, and 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. Through the setting of the return spring 39, when the pushing frame 26 releases the thrust, the elastic force of the return spring 39 pushes the movable plate 38, the rotating ring 40 and the unloading ring 25 to reset. 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, and a rotating groove is provided inside the unloading 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 platform 10 and is restricted from rotating, when the inflatable shaft 5 rotates, the movable plate 38 and the rotating ring 40 will be driven to rotate inside the rotating groove, thereby not affecting the normal unwinding of the device.

[0026] The basic principles, main features and advantages of the present invention are shown and described above.

[0027] Those skilled in the art should understand that the present invention is not limited to the above-mentioned embodiments. The above-mentioned embodiments and the specification only describe the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. These changes and improvements all fall within the scope of the present invention to be protected.

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 guide platforms (10), and the top ends of the guide platforms (10) are arranged to be inclined toward the middle. The side walls of the bottom plate (6) are 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, and the bottom plate (6) is provided with a unloading mechanism for unloading the tube. The inner side of the fixed frame (11) is provided with a driving mechanism for driving the L-shaped block (14) to move.

2. The tension-adjustable paper feeding mechanism for a flexographic printing press according to claim 1, characterized in that: 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).

3. The tension-adjustable paper feeding mechanism for a flexographic printing press according to claim 2, 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).

4. 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).

5. The tension-adjustable paper feeding mechanism for a flexographic printing press according to claim 1, characterized in that: 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.

6. The tension-adjustable paper feeding mechanism for a flexographic printing press according to claim 5, 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).

7. The tension-adjustable paper feeding mechanism for a flexographic printing press according to claim 4, 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).

8. The tension-adjustable paper feeding mechanism for a flexographic printing press according to claim 5, 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.

9. The tension-adjustable paper feeding mechanism for a flexographic printing press according to claim 1, characterized in that: The guide platform (10) is provided with a collection box (41) for collecting waste paper rolls on one side thereof.

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