A paper box printing feeding device

Abstract

The utility model relates to paper box printing technical field, concretely is a kind of paper box printing's feeding device, including storage rack, multiple feeding rollers are rotatably installed on storage rack by bearing, the driving end of multiple feeding rollers is provided with synchronous drive assembly, load carrier is arranged between adjacent two feeding rollers, load carrier is installed on storage rack, the middle part of load carrier is equipped with sliding slot, mobile rack is symmetrically installed in sliding slot and slides, the top end of mobile rack is provided with limit baffle, and bottom end is provided with synchronous opposite moving component, the front end of two groups of limit baffles is liftably provided with front baffle, and rear end is rotatably provided with rear baffle, the front end of storage rack is provided with belt feeding conveyor, and rear is provided with feeding pushing structure, the utility model can be according to the model and thickness of paper box flexible adjustment feeding's storage space and the discharge height of front baffle, improve the feeding flexibility and stability when paper box printing operation.

Description

Technical Field

[0001] This utility model relates to the field of cardboard box printing technology, specifically to a feeding device for cardboard box printing. Background Technology

[0002] In the cardboard box printing industry, the material feeding process is a key pre-printing step. Its operational stability and specification adaptability directly determine the subsequent printing efficiency and product quality. Once the material feeding deviates, it can easily lead to problems such as printing misalignment and missing prints, significantly increasing rework costs.

[0003] The core pain point of existing carton printing and feeding devices is insufficient adaptability. Most devices adopt a fixed material storage structure design, and the spacing of the limiting components on both sides cannot be flexibly adjusted according to the length and width of different carton models. This makes it easy for the cartons to be misaligned and have other skew problems when stacking, which directly affects the accuracy of subsequent feeding and positioning.

[0004] Meanwhile, for cartons of different thicknesses, the discharge end baffle structure of traditional devices is mostly of fixed height. Adjustment requires manual disassembly and replacement of parts, which is cumbersome and time-consuming. The adjustment accuracy is difficult to control, and multiple cartons are easily stacked or a single carton gets stuck, which seriously reduces the continuity and stability of feeding.

[0005] In addition, some devices rely solely on a single structure such as conveyor rollers to drive feeding. When the surface of the carton is damp, worn, or the stacking pressure is uneven, the friction between the carton and the conveying components will decrease significantly, which can easily lead to feeding stagnation, conveying jams, and other malfunctions, severely restricting overall production efficiency. For example, the carton processing feeding structure provided in the Chinese patent document with publication number CN222329167U only achieves feeding drive by setting a set of main anti-slip rollers at the bottom of the carton, which has poor stability. Utility Model Content

[0006] The purpose of this invention is to provide a feeding device for printing cardboard boxes to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a feeding device for carton printing, comprising a storage rack, on which multiple feeding rollers are rotatably mounted via bearings, and a synchronous drive assembly is provided at the drive end of the multiple feeding rollers. A support frame is provided between two adjacent feeding rollers, and the support frame is mounted on the storage rack. A sliding groove is provided in the middle of the support frame, and a movable frame is slidably and symmetrically installed in the sliding groove. A limit baffle is provided at the top of the movable frame, and a synchronous opposing moving assembly is provided at the bottom. A front baffle is provided at the front end of the two sets of limit baffles, and a rear baffle is provided at the rear end, which can be rotatably opened. A belt feeding conveyor is provided at the front end of the storage rack, and a feeding pushing structure is provided at the rear.

[0008] The present invention is further configured such that the feeding and pushing structure includes a pushing frame, on which a first electric push rod is installed. The output end of the first electric push rod is provided with a pushing plate. The bottom end of the pushing plate matches the top end of the feeding roller, and the height of the pushing plate is less than the distance between the back baffle and the pushing frame. During feeding, in addition to starting the drive motor to control the rotation of the feeding roller, the first electric push rod is started simultaneously. The pushing plate is moved by controlling the first electric push rod, so that the pushing plate passes through the gap between the back baffle and the storage rack, which can push the bottom layer of cartons, assisting the feeding roller in pushing the bottom layer of cartons, reducing the friction force on the cartons, and improving the stability and fullness of feeding.

[0009] The present invention is further configured such that the pushing plate is L-shaped, the pushing frame has an installation groove, the first electric push rod is located in the installation groove, the short end of the pushing plate is provided with a guide slider, the inner side wall of the installation groove is provided with a guide groove, and the guide slider slides in the guide groove. By setting the guide slider and the guide groove, the movement stability of the pushing plate can be improved, so that the pushing plate can push the bottom carton more stably, improve the feeding effect, and work in conjunction with the feeding roller to reduce the failure of carton feeding.

[0010] The present invention is further configured such that the synchronous drive assembly includes a drive motor, which is connected to one of the feeding rollers. A synchronous belt drive structure is provided between two adjacent feeding rollers. When the drive motor is started, the corresponding feeding roller can be controlled to rotate. Through the cooperation between the feeding roller and the synchronous belt drive structure, the other feeding rollers can be controlled to rotate synchronously, thereby pushing the bottom carton forward under the action of friction, realizing automatic feeding. Here, the synchronous belt drive structure is driven by the meshing of the synchronous pulley and the synchronous belt. The synchronous belt drive has a constant transmission ratio and stable transmission characteristics, which are widely used in multi-axis synchronous drive. The installation of the synchronous pulley on the roller shaft structure and the installation of the synchronous belt on the synchronous pulley can be achieved by existing technology, which should be known to those skilled in the art. The present invention will not elaborate on this. At the same time, the feeding roller in the present invention preferably adopts a roller shaft structure with a rubber anti-slip surface layer, which can improve the sliding friction between the carton and the feeding roller.

[0011] The present invention is further configured such that the synchronous opposing movement component includes a bidirectional screw, which is mounted on a storage rack via bearings. An adjusting motor is mounted on the storage rack, and the adjusting motor is connected to the drive end of the bidirectional screw. A moving seat is provided at the bottom of the moving frame, and the moving seat is threaded onto the bidirectional screw. When the adjusting motor is started, the rotation of the bidirectional screw can be controlled. The synchronous opposing movement of the moving seat can be achieved through the threaded engagement structure between the bidirectional screw and the moving seat, and the sliding guide engagement between the moving seat and the limiting slide bar. The moving seat drives the movement of the moving frame and the limiting baffle, thereby adjusting the limiting position of the carton to be printed and improving the feeding accuracy.

[0012] The present invention is further configured such that limiting slide rods are provided on both sides of the bidirectional screw, and the movable seat is slidably sleeved on the limiting slide rods. By setting the limiting slide rods, the movement of the movable seat on the bidirectional screw can be limited, thereby improving the movement stability of the movable frame and the limiting baffle.

[0013] The present invention is further configured such that the front baffle includes a fixed baffle, both ends of which are mounted on the storage rack via support legs. A lifting groove is provided at the rear of the fixed baffle, and a second electric push rod is provided at the top of the lifting groove. A lifting baffle is provided at the bottom of the second electric push rod. The lifting baffle is slidably installed in the lifting groove. When printing cartons of different thicknesses, the second electric push rod is activated, which controls the lifting of the lifting baffle, thereby adjusting the distance from the bottom of the lifting baffle to the feeding roller. This allows cartons of different thicknesses to pass through while intercepting cartons waiting to be fed from the upper layer, ensuring feeding stability and flexibility. Limiting telescopic rods can be provided on both sides of the second electric push rod for guidance and limitation, while also sharing the load on the second electric push rod. In addition, a slider and sliding groove structure can be provided between the lifting baffle and the lifting groove for movement guidance, improving the installation stability of the lifting baffle in the lifting groove.

[0014] The present invention is further configured such that the rear baffle includes a connecting shaft end, and the rear baffle is rotatably mounted on the storage rack or pusher rack through the cooperation of the connecting shaft end and a bearing. A limit stop is provided at the end of the storage rack away from the connecting shaft end, and a limit groove is formed on the rear baffle. The limit stop and the limit groove engage with each other, and a latch is provided between the limit stop and the rear baffle. The latch includes, but is not limited to, a locking buckle. The rear baffle can be flipped open via the connecting shaft end, thus facilitating the loading of cartons onto the storage rack. After loading is complete, the rear baffle is fastened, so that the rear of the two sets of limit stops is in a closed state, strengthening the rear of the carton after loading. To enhance the protective effect, an adjusting stud can be threaded onto the rear baffle. The inner end of the adjusting stud is rotatably mounted with a pressing plate via a bearing structure, and the outer end is equipped with an adjusting knob. A guide post is located behind the pressing plate, and the guide post slides against the rear baffle. Thus, after placing the carton on the storage rack and onto the feeding roller, rotating the adjusting knob causes the adjusting stud to rotate, allowing the pressing plate to move inside the rear baffle. This compresses the carton located between the two sets of limiting baffles, allowing for better carton stacking and improved feeding accuracy. The guide post also enhances the stability of the pressing plate's movement.

[0015] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model is flexible and adaptable, and can accurately match different models of cartons. In this utility model, the motor drives the bidirectional screw, which drives the moving frame and the limiting baffle to move synchronously in opposite directions, thereby limiting the cartons on both sides; the rear baffle pushes the extrusion plate to squeeze the cartons through the adjusting stud, ensuring neat stacking. The second electric push rod of the front baffle controls the lifting baffle to rise and fall, adapting to cartons of different thicknesses, intercepting upper materials to ensure orderly feeding, and improving the adaptability of multi-specification operations.

[0016] 2. This utility model features stable and efficient feeding, with dual drives ensuring smooth conveying. The synchronous drive assembly uses a drive motor and synchronous belt to achieve synchronous rotation of multiple feeding rollers, and the rubber anti-slip surface enhances friction. In the feeding pushing structure, the first electric push rod drives the pushing plate, which passes through the gap in the rear baffle to push the bottom layer of the carton, assisting the feeding rollers in pushing, reducing friction, avoiding jamming, and improving feeding stability and fullness.

[0017] 3. This utility model offers convenient operation and comprehensive protection, optimizing the material loading process. The rear baffle can be flipped open via the connecting shaft end for easy batch loading. After fastening, the limiting block and lock are fixed, strengthening rear protection. The push plate guide slider and slide groove cooperate, and the moving seat limiting slide rod guide and other structures improve the stability of component operation. The overall structure achieves automated control through mechanical coordination, reducing manual intervention and optimizing work efficiency. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the overall structure of a feeding device for printing cardboard boxes according to this utility model. Figure 1 ; Figure 2 This is a schematic diagram of the overall structure of a feeding device for printing cardboard boxes according to this utility model. Figure 2 ; Figure 3 This is a schematic diagram of the installation structure of the limiting baffle in this utility model; Figure 4 This is a schematic diagram of the driving structure of the limiting baffle in this utility model; Figure 5 This is a cross-sectional schematic diagram of the installation structure of the support frame in this utility model; Figure 6 This is a cross-sectional view of the cooperation structure between the fixed baffle and the lifting baffle in this utility model; Figure 7 This is a schematic diagram of a partial fit between the rear baffle and the limiting block in this utility model; Figure 8 This is a cross-sectional view of the position and structure of the push plate in this utility model.

[0019] The components represented by each number in the attached diagram are listed below: 1. Storage rack; 2. Feeding roller; 3. Bearing frame; 4. Slide chute; 5. Moving frame; 6. Limiting baffle; 7. Front baffle; 8. Rear baffle; 9. Belt conveyor; 10. Pushing frame; 11. First electric push rod; 12. Pushing plate; 13. Mounting slot; 14. Guide slider; 15. Guide slide chute; 16. Drive motor; 17. Synchronous belt drive structure; 18. Bidirectional screw; 19. Adjusting motor; 20. Moving seat; 21. Limiting slide rod; 22. Fixed baffle; 23. Lifting chute; 24. Second electric push rod; 25. Lifting baffle; 26. Connecting shaft end; 27. Limiting block; 28. Lock; 29. ​​Adjusting stud; 30. Extrusion plate; 31. Adjusting knob; 32. Guide column. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] This utility model provides a technical solution: Please refer to Figures 1-8A feeding device for printing cartons includes a storage rack 1, on which multiple feeding rollers 2 are rotatably mounted via bearings. The driving ends of the multiple feeding rollers 2 are provided with synchronous driving components. A support frame 3 is provided between two adjacent feeding rollers 2. The support frame 3 is mounted on the storage rack 1. A chute 4 is provided in the middle of the support frame 3. A movable frame 5 is slidably and symmetrically installed in the chute 4. A limit baffle 6 is provided at the top of the movable frame 5, and a synchronous opposing moving component is provided at the bottom. A front baffle 7 is provided at the front end of the two sets of limit baffles 6, and a rear baffle 8 is provided at the rear end, which can be rotatably opened. A belt feeding conveyor 9 is provided at the front end of the storage rack 1, and a feeding pushing structure is provided at the rear.

[0022] Please see Figures 1-8 As one embodiment of the present invention: the feeding and pushing structure of the present invention includes a pushing frame 10, on which a first electric push rod 11 is installed. A pushing plate 12 is provided at the output end of the first electric push rod 11. The bottom end of the pushing plate 12 matches the top end of the feeding roller 2, and the height of the pushing plate 12 is less than the distance between the rear baffle 8 and the pushing frame 10. When feeding, in addition to starting the drive motor 16 to control the rotation of the feeding roller 2, the first electric push rod 11 is started simultaneously. The pushing plate 12 is moved by controlling the first electric push rod 11, so that the pushing plate 12 passes through the gap between the rear baffle 8 and the storage rack 1, which can push the bottom layer of cartons, assist the feeding roller 2 in pushing the bottom layer of cartons, reduce the friction force on the cartons, and improve the stability and fullness of feeding.

[0023] Please see Figures 1-8 As one embodiment of this utility model: In this utility model, the pushing plate 12 is L-shaped, and the pushing frame 10 is provided with a mounting groove 13. The first electric push rod 11 is located in the mounting groove 13. The short end of the pushing plate 12 is provided with a guide slider 14. The inner side wall of the mounting groove 13 is provided with a guide groove 15. The guide slider 14 slides in the guide groove 15. By setting the guide slider 14 and the guide groove 15, the movement stability of the pushing plate 12 can be improved, so that the pushing plate 12 can push the bottom carton more stably, improve the feeding effect, and work in conjunction with the feeding roller 2 to reduce the failure of carton feeding.

[0024] Please see Figures 1-8 As one embodiment of the present invention: the synchronous drive component of the present invention includes a drive motor 16, the drive motor 16 is connected to one of the feeding rollers 2, and a synchronous belt drive structure 17 is provided between two adjacent feeding rollers 2. In use, the drive motor 16 is started, which controls the rotation of the corresponding feeding roller 2. The feeding roller 2, in conjunction with the synchronous belt drive structure 17, controls the synchronous rotation of other feeding rollers 2, thereby pushing the bottom carton forward under the action of friction, thus achieving automatic feeding. Here, the synchronous belt drive structure 17 is driven by the meshing of the synchronous pulley and the synchronous belt. The synchronous belt drive has a constant transmission ratio and stable transmission characteristics, which are widely used in multi-axis synchronous drive. The installation of the synchronous pulley on the roller shaft structure and the installation of the synchronous belt on the synchronous pulley can be achieved by existing technology, which should be known to those skilled in the art. This utility model will not elaborate on these aspects. At the same time, in this utility model, the feeding roller 2 preferably adopts a roller shaft structure with a rubber anti-slip surface layer, which can improve the sliding friction between the carton and the feeding roller 2.

[0025] Please see Figures 1-8 As one embodiment of the present invention: the synchronous moving component in the present invention includes a bidirectional screw 18, the bidirectional screw 18 is mounted on the storage rack 1 through bearings, the storage rack 1 is equipped with an adjusting motor 19, the adjusting motor 19 is connected to the drive end of the bidirectional screw 18, and the bottom end of the moving frame 5 is provided with a moving seat 20, the moving seat 20 is threadedly mounted on the bidirectional screw 18. Start the adjusting motor 19. The rotation of the bidirectional screw 18 can be controlled by the adjusting motor 19. The threaded engagement structure between the bidirectional screw 18 and the moving seat 20 and the sliding guide engagement between the moving seat 20 and the limiting slide bar 21 can realize the synchronous movement of the moving seat 20 in opposite directions. The moving seat 20 drives the moving frame 5 and the limiting baffle 6 to move, thereby realizing the adjustment of the limiting position of the carton to be printed and improving the feeding accuracy.

[0026] Please see Figures 1-8 As one embodiment of the present invention: In the present invention, the two-way screw 18 is provided with limiting slide rods 21 on both sides, and the movable seat 20 is slidably sleeved on the limiting slide rods 21. The movement of the movable seat 20 on the bidirectional screw 18 can be limited by the setting of the limiting slide bar 21, thereby improving the movement stability of the movable frame 5 and the limiting baffle 6.

[0027] Please see Figures 1-8 As one embodiment of the present invention: the front baffle 7 of the present invention includes a fixed baffle 22. The two ends of the fixed baffle 22 are mounted on the storage rack 1 through a support leg structure. A lifting groove 23 is provided at the rear of the fixed baffle 22. A second electric push rod 24 is provided at the top of the inside of the lifting groove 23. A lifting baffle 25 is provided at the bottom of the second electric push rod 24. The lifting baffle 25 is slidably installed in the lifting groove 23. When printing on cartons of different thicknesses, the second electric push rod 24 is activated. The second electric push rod 24 controls the lifting of the lifting baffle 25, thereby adjusting the distance from the bottom of the lifting baffle 25 to the feeding roller 2. This allows cartons of different thicknesses to pass through while intercepting cartons waiting to be fed from the upper layer, ensuring feeding stability and flexibility. Limiting telescopic rods can be set on both sides of the second electric push rod 24 for guidance and limiting, while also sharing the load on the second electric push rod 24. In addition, a sliding block and sliding groove structure can be set between the lifting baffle 25 and the lifting groove 23 for movement guidance, improving the installation stability of the lifting baffle 25 in the lifting groove 23.

[0028] Please see Figures 1-8 As one embodiment of the present invention: In the present invention, the rear baffle 8 includes a connecting shaft end 26. The rear baffle 8 is rotatably mounted on the storage rack 1 or the push rack 10 through the cooperation of the connecting shaft end 26 and the bearing. A limit block 27 is provided at the end of the storage rack 1 away from the connecting shaft end 26. A limit groove is provided on the rear baffle 8. The limit block 27 and the limit groove are engaged with each other. A latch 28 is provided between the limit block 27 and the rear baffle 8. The latch 28 includes, but is not limited to, a locking buckle. The rear baffle 8 can be flipped open through the connecting shaft end 26, which facilitates the loading of the carton onto the storage rack 1. After loading is completed, the rear baffle 8 is fastened, so that the rear of the two sets of limiting baffles 6 is in a closed state, which enhances the protection effect of the rear of the carton after loading. Here, an adjusting stud 29 can be threaded on the rear baffle 8. The inner end of the adjusting stud 29 is rotatably mounted with a pressing plate 30 through a bearing structure, and the outer end is provided with an adjusting knob 31. A guide post 32 is provided behind the pressing plate 30, and the guide post 32 is slidably engaged with the rear baffle 8. In this way, after the carton is placed on the storage rack 1 and positioned on the feeding roller 2, the adjusting knob 31 can be rotated to make the adjusting stud 29 rotate, so that the extrusion plate 30 can move inside the rear baffle 8, thereby extruding the carton located between the two sets of limiting baffles 6, so that the carton can be stacked better and the feeding accuracy can be improved. The setting of the guide column 32 can improve the movement stability of the extrusion plate 30.

[0029] In summary: When using this utility model, the rear panel 8 is opened, and the cartons to be printed can be placed on the storage rack 1 by a forklift or manually, and positioned above the support frame 3 and the feeding roller 2. Then, flip the rear baffle 8 so that it engages with the rear of the two sets of limiting baffles 6, thus closing the rear. This causes the limiting groove on the rear baffle 8 to engage with the limiting block 27, and then locks it in place by the latch 28. Before or after the above steps, the adjusting motor 19 can be started. The adjusting motor 19 can control the rotation of the bidirectional screw 18. Through the threaded engagement structure between the bidirectional screw 18 and the moving seat 20 and the sliding guide engagement between the moving seat 20 and the limiting slide rod 21, the moving seat 20 can move synchronously in opposite directions. The moving seat 20 drives the moving frame 5 and the limiting baffle 6 to move. Through the cooperation of the two sets of limiting baffles 6, the two sides of the carton are limited, thereby realizing the adjustment of the limiting position of the carton to be printed and improving the feeding accuracy. Then, the adjustment knob 31 can be rotated to make the adjustment stud 29 rotate, so that the extrusion plate 30 can move inside the rear baffle 8, thereby extruding and aligning the cartons located between the two sets of limit baffles 6, so that the cartons can be better stacked on the storage rack 1, improving the accuracy of feeding. The setting of the guide column 32 can improve the movement stability of the extrusion plate 30.

[0030] After the carton loading position is positioned, the drive motor 16 is started. The drive motor 16 can control the corresponding loading roller 2 to rotate. The loading roller 2 and the synchronous belt drive structure 17 can control the other loading rollers 2 to rotate synchronously, thereby pushing the bottom carton forward under the action of friction to achieve automatic loading. Simultaneously, the first electric push rod 11 is activated, and the push plate 12 is moved by the first electric push rod 11, so that the push plate 12 passes through the gap between the rear baffle 8 and the storage rack 1, which can push the bottom carton, assist the feeding roller 2 in pushing the bottom carton, reduce the friction force on the carton, and improve the stability and fullness of feeding.

[0031] This utility model has a front baffle 7 at the front end of the two sets of limiting baffles 6. The front baffle 7 includes a fixed baffle 22 and a lifting baffle 25 that cooperate with each other. When facing the printing and feeding operation of cartons of different thicknesses, the second electric push rod 24 can be activated. The second electric push rod 24 can control the lifting of the lifting baffle 25, thereby adjusting the distance from the bottom of the lifting baffle 25 to the feeding roller 2. In this way, cartons of different thicknesses can pass through, while intercepting the cartons to be fed on the upper layer, ensuring feeding stability and feeding flexibility. Here, limit telescopic rods can be set on both sides of the second electric push rod 24 for guiding and limiting, while also sharing the load of the second electric push rod 24. In addition, a sliding block and sliding groove structure can be set between the lifting baffle 25 and the lifting groove 23 for moving guidance, thereby improving the installation stability of the lifting baffle 25 in the lifting groove 23.

[0032] In this utility model, the operation of related electrical components such as motors and electric push rods can be controlled by a PLC control system according to a set program. The specific working process and working principle of this utility model have been described in detail. Based on the above working process and working principle, those skilled in the art should know the specific circuit connection relationship and implement it through existing technology. Furthermore, the circuit connection relationship between related electrical components and the specific driver program are not the subject of protection of this utility model, and this utility model will not elaborate on them. In this utility model, a flexible protective cover can be provided on the outside of the bidirectional screw 18 for protection. The flexible protective cover includes, but is not limited to, existing products such as corrugated covers. The specific installation of the cover can be achieved by existing technology. This utility model does not limit the specific installation of the cover. Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A feeding device for printing cartons, comprising a storage rack (1), characterized in that: Multiple feeding rollers (2) are rotatably mounted on the storage rack (1) via bearings. A synchronous drive assembly is provided at the drive end of the multiple feeding rollers (2). A support frame (3) is provided between two adjacent feeding rollers (2). The support frame (3) is mounted on the storage rack (1). A sliding groove (4) is provided in the middle of the support frame (3). A movable frame (5) is slidably and symmetrically installed in the sliding groove (4). A limit baffle (6) is provided at the top of the movable frame (5), and a synchronous opposing moving assembly is provided at the bottom. A front baffle (7) is provided at the front end of the two sets of limit baffles (6), and a rear baffle (8) is provided at the rear end. A belt feeding conveyor (9) is provided at the front end of the storage rack (1), and a feeding pushing structure is provided at the rear.

2. The feeding device for carton printing according to claim 1, characterized in that: The feeding and pushing structure includes a pushing frame (10), on which a first electric push rod (11) is installed. The output end of the first electric push rod (11) is provided with a pushing plate (12). The bottom end of the pushing plate (12) matches the top end of the feeding roller (2), and the height of the pushing plate (12) is less than the distance between the rear baffle (8) and the pushing frame (10).

3. The feeding device for carton printing according to claim 2, characterized in that: The push plate (12) is L-shaped, and the push frame (10) is provided with an installation groove (13). The first electric push rod (11) is located in the installation groove (13). The short end of the push plate (12) is provided with a guide slider (14). The inner side wall of the installation groove (13) is provided with a guide groove (15). The guide slider (14) slides in the guide groove (15).

4. The feeding device for carton printing according to claim 1, characterized in that: The synchronous drive assembly includes a drive motor (16), which is connected to one of the feeding rollers (2) in a transmission connection, and a synchronous belt drive structure (17) is provided between two adjacent feeding rollers (2).

5. The feeding device for carton printing according to claim 1, characterized in that: The synchronous opposing moving component includes a bidirectional screw (18), which is mounted on the storage rack (1) via bearings. An adjusting motor (19) is mounted on the storage rack (1), and the adjusting motor (19) is connected to the drive end of the bidirectional screw (18). A moving seat (20) is provided at the bottom end of the moving frame (5), and the moving seat (20) is threaded onto the bidirectional screw (18).

6. The feeding device for carton printing according to claim 5, characterized in that: The two-way screw (18) is provided with limit slides (21) on both sides, and the movable seat (20) is slidably sleeved on the limit slides (21).

7. The feeding device for carton printing according to claim 1, characterized in that: The front baffle (7) includes a fixed baffle (22). The two ends of the fixed baffle (22) are mounted on the storage rack (1) through a support leg structure. A lifting groove (23) is provided at the rear of the fixed baffle (22). A second electric push rod (24) is provided at the top of the lifting groove (23). A lifting baffle (25) is provided at the bottom of the second electric push rod (24). The lifting baffle (25) is slidably installed in the lifting groove (23).

8. The feeding device for carton printing according to claim 1, characterized in that: The rear baffle (8) includes a connecting shaft end (26). The rear baffle (8) is rotatably mounted on the storage rack (1) or the push rack (10) through the cooperation of the connecting shaft end (26) and the bearing. A limit stop (27) is provided at the end of the storage rack (1) away from the connecting shaft end (26). A limit stop groove is provided on the rear baffle (8). The limit stop (27) and the limit stop groove are engaged with each other. A latch (28) is provided between the limit stop (27) and the rear baffle (8).

9. The feeding device for carton printing according to claim 1, characterized in that: The rear baffle (8) is threaded with an adjusting stud (29). The inner end of the adjusting stud (29) is rotatably mounted with a pressing plate (30) through a bearing structure, and the outer end is provided with an adjusting knob (31). A guide post (32) is provided behind the pressing plate (30), and the guide post (32) slides with the rear baffle (8).

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