Automatic discharging device for paperboard printing

Abstract

The invention discloses an automatic discharging device for paperboard printing, and relates to the technical field of discharging, the automatic discharging device comprises a mounting frame, a sticking roller for sticking and removing dust and dirt on the upper surface and the lower surface of a paperboard is arranged on the mounting frame, and a discharging mechanism for feeding the paperboard into the sticking roller is arranged on one side of the sticking roller; a stacking device for stacking the cleaned paperboards is arranged on the mounting frame; the discharging mechanism comprises a discharging frame used for stacking the paperboards and a pushing device used for pushing the set of paperboards at the lowermost end in the discharging frame into the adhering roller. The stacking device comprises a discharging device used for stacking the paperboards and a stacking device used for pressing a set of paperboards at the uppermost end of the discharging device and aligning the multiple sets of paperboards. Paperboards can be automatically stacked through the discharging device, the height is kept unchanged through downward pressing, the requirement for manual intervention is reduced, the operation efficiency is improved, and the production speed is increased.

Description

Technical Field

[0001] The invention relates to the technical field of unloading, in particular to an automatic unloading device for cardboard printing. Background Art

[0002] The Chinese patent with the publication number CN114249074A discloses an automatic unloading device for cardboard printing, including a base, a support plate and a pair of placement plates, the upper end surface of the base is provided with a pair of slide rails, the pair of slide rails are arranged horizontally on the left and right, the bottom surface of the support plate is slidably connected with the pair of slide rails through a slider, the base is provided with a telescopic cylinder for driving the support plate to slide along the slide rails, a lifting device is installed between each placement plate and the support plate, a tray is placed on the placement plate, a pair of placement plates are arranged in sequence along the moving direction of the slide rails, and a baffle is vertically provided on the rear end surface of each placement plate. The unloading device cooperates with the placement plate and the lifting device so that the printed cardboards are stacked one by one on the pallet. After the pallet is full, the support plate is pulled by the cylinder to move the placement plate without cardboard to the designated position for cardboard stacking. It can be operated continuously, with high efficiency, and does not require manual sorting and transportation, saving labor.

[0003] After printing, the surface of the cardboard may be contaminated with dust and other dirt, which may lead to subsequent quality problems or affect the appearance and hygiene. Therefore, cleaning and maintenance are required to ensure product quality and hygiene standards. However, the above-mentioned prior art can only unload the cardboard, but cannot clean the surface of the cardboard. Therefore, the present invention provides an automatic unloading device for cardboard printing to solve the above-mentioned problem. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides an automatic unloading device for cardboard printing, which solves the problems mentioned in the above background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: an automatic unloading device for cardboard printing, comprising: a mounting frame, a sticking roller for removing dust and dirt from the upper and lower surfaces of the cardboard is provided on the mounting frame, a unloading mechanism for feeding the cardboard into the sticking roller is provided on one side of the sticking roller, and a stacking device for stacking the cleaned cardboard is provided on the mounting frame;

[0006] The unloading mechanism comprises a unloading frame for stacking cardboards and a pushing device for pushing a group of cardboards at the bottom of the unloading frame into the sticking roller;

[0007] The stacking device includes a feeding device for stacking cardboards and a stacking device for pressing down a group of cardboards at the upper end of the feeding device and aligning multiple groups of cardboards;

[0008] A driving device is provided at the side end of the sticky roller, and the driving device drives the sticky roller to rotate, and synchronously drives the pushing device to push the cardboard into the sticky roller. When the sticky roller finishes cleaning a group of cardboards, the driving device drives the sticky roller to reverse and reset the pushing device.

[0009] As a further solution of the present invention: an adjustment groove for adjusting the height of the adhesive roller is formed on the side end of the mounting frame, a movable groove for adjusting the position of the stacking device so that the stacking device releases the restriction on the discharge device is formed on the side end of the mounting frame, a mounting plate for mounting the pushing device is fixedly connected to the inner end of the mounting frame, and a support plate for supporting the pushing device is fixedly connected to the side end of the mounting frame.

[0010] As a further solution of the present invention: the adhesive rollers are provided in two groups, one group of the adhesive rollers penetrates the mounting frame and is rotatably connected to the mounting frame, and the other group of the adhesive rollers is rotatably connected to the adjustment groove.

[0011] As a further solution of the present invention: the driving device includes a transmission wheel 1 fixedly connected to the end face of a group of adhesive rollers passing through the mounting frame, one end of the transmission wheel 1 is rotatably connected to a motor fixing frame, and the motor fixing frame is fixedly connected to the mounting frame, one end of the motor fixing frame is fixedly connected to a driving motor, and the output end of the driving motor passes through the motor fixing frame and is fixedly connected to the transmission wheel 1.

[0012] As a further solution of the present invention: the driving device also includes a transmission wheel 2 arranged at a lower end of the transmission wheel, the transmission wheel 2 is rotatably connected to the mounting frame, a belt is arranged between the transmission wheel 1 and the transmission wheel 2, the transmission wheel 1 and the transmission wheel 2 are connected through belt transmission, and one end of the transmission wheel 2 is fixedly connected to a gear.

[0013] As a further solution of the present invention: the pushing device includes a rack meshing with the gear, the bottom end of the rack is slidably connected to the support plate, the side end of the rack is fixedly connected to a connecting frame that penetrates the mounting frame, the other end of the connecting frame is fixedly connected to a slider, the bottom end of the slider is slidably connected to a slide rail, the slide rail is fixedly connected to the top of the mounting plate, the top of the slider is fixedly connected to a retraction box, a pushing rod is provided in the retraction box, and the top end of the pushing rod penetrates the retraction box and the mounting frame, and a retraction spring is provided between the bottom end of the pushing rod and the bottom end inside the retraction box.

[0014] As a further solution of the present invention: the side end of the discharge frame is provided with an entry slot for the push rod to move into the discharge frame and push the cardboard in the discharge frame, and the other side of the discharge frame is provided with a push-out slot for pushing the cardboard out of the discharge frame during the pushing process.

[0015] As a further solution of the present invention: the discharge device includes a base clamped with the mounting frame, the bottom end of the base is fixedly connected to a universal wheel, the top end of the base is fixedly connected to a telescopic rod, the top end of the telescopic rod is fixedly connected to a discharge plate, and the outer surface of the telescopic rod is sleeved with a reset spring.

[0016] As a further solution of the present invention: the stacking device includes a connecting shaft passing through the movable groove, and the connecting shaft passes through a connecting plate, one end of the connecting plate is rotatably connected to a placing roller, the other end of the connecting plate is fixedly connected to a rotating motor, the output end of the rotating motor passes through the connecting plate and is fixedly connected to the placing roller, the side end of the connecting plate is fixedly connected to a limiting plate, and the inner side of the limiting plate abuts against the side end of the discharge plate.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. In the present invention, the cardboard can be automatically stacked by the unloading device, and the height can be kept unchanged by pressing down, which reduces the need for manual intervention and improves the operation efficiency and production speed;

[0019] 2. In the present invention, the cardboards on the unloading device can be limited by the limiting plate to align multiple groups of cardboards, ensuring that the stacked cardboards are neatly arranged, improving the aesthetics and stability of the stacking, and the placing roller can press down the top group of cardboards on the unloading device to keep the height of the cardboards unchanged, ensuring the compactness and stability of the cardboard stacking;

[0020] 3. The automatic retraction mechanism composed of the retraction box, retraction spring and push rod in the pushing device can automatically reset and prepare to push the next group of paperboards after one group of paperboards are pushed out, thereby realizing automatic continuous operation and improving production efficiency;

[0021] 4. In the present invention, the driving device can synchronously control the rotation of the sticky roller and drive the pushing device to push the cardboard into the sticky roller, so that the cleaning process is efficient and coherent, ensuring that each group of cardboard can pass through the cleaning action of the sticky roller, thereby improving the cleaning effect and production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of an automatic unloading device for cardboard printing according to the present invention;

[0023] Figure 2 It is a rear view of the overall structure of an automatic unloading device for cardboard printing according to the present invention;

[0024] Figure 3 It is a side view of the overall structure of an automatic unloading device for cardboard printing according to the present invention;

[0025] Figure 4It is a structural schematic diagram of a mounting frame in an automatic unloading device for cardboard printing according to the present invention;

[0026] Figure 5 It is a schematic structural diagram of a driving device in an automatic unloading device for cardboard printing according to the present invention;

[0027] Figure 6 It is a structural schematic diagram of a B position in an automatic unloading device for cardboard printing according to the present invention;

[0028] Figure 7 It is a structural schematic diagram of a pushing device in an automatic unloading device for cardboard printing according to the present invention;

[0029] Figure 8 It is a schematic structural diagram of position A in an automatic unloading device for cardboard printing according to the present invention;

[0030] Fig. 9 It is a structural schematic diagram of a discharging frame in an automatic discharging device for cardboard printing according to the present invention;

[0031] Fig.10 It is a structural schematic diagram of a material discharging device in an automatic unloading device for cardboard printing according to the present invention;

[0032] Fig.11 The present invention is a schematic structural diagram of a stacking device in an automatic unloading device for cardboard printing.

[0033] In the figure: 1. mounting frame; 11. adjustment slot; 12. mounting plate; 13. support plate; 14. moving slot; 2. unloading frame; 21. entry slot; 22. ejection slot; 3. sticky roller; 4. driving device; 41. transmission wheel 1; 42. driving motor; 43. transmission wheel 2; 44. gear; 45. belt; 46. motor fixing frame; 5. pushing device; 51. connecting frame; 52. rack; 53. slide rail; 54. slider; 55. retraction box; 56. retraction spring; 57. pushing rod; 6. stacking device; 61. connecting shaft; 62. connecting plate; 63. placing roller; 64. rotating motor; 65. limiting plate; 7. unloading device; 71. base; 72. universal wheel; 73. telescopic rod; 74. unloading plate; 75. reset spring. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following is an explanation of an embodiment of the present invention based on the overall structure of the present invention.

[0036] Reference Figures 1 to 3 In an embodiment of the present invention, an automatic unloading device for cardboard printing includes: a mounting frame 1, a sticking roller 3 for removing dust and dirt from the upper and lower surfaces of the cardboard is provided on the mounting frame 1, a unloading mechanism for feeding a group of cardboards into the sticking roller 3 each time is provided on one side of the sticking roller 3, and a stacking device for collecting and stacking the cleaned cardboards to align multiple groups of cardboards is provided on the mounting frame 1;

[0037] The unloading mechanism comprises an unloading frame 2 for stacking a plurality of groups of cardboards and a pushing device 5 for pushing the lowest group of cardboards in the unloading frame 2 into the sticking roller 3 each time;

[0038] The stacking device includes a discharge device 7 for stacking cleaned cardboards and a stacking device 6 for pressing down a group of cardboards at the top of the discharge device 7 so that the height of the group of cardboards at the top of the discharge device 7 remains unchanged and aligning multiple groups of cardboards;

[0039] A driving device 4 is provided at the side end of the sticky roller 3. The driving device 4 drives the sticky roller 3 to rotate, and synchronously drives the pushing device 5 to push the cardboard into the sticky roller 3, so that the rotating sticky roller 3 can remove dust and dirt on the surface of the cardboard by adhesion. When the sticky roller 3 completes cleaning of a group of cardboards and completely leaves the sticky roller 3 and enters the discharge device 7, the driving device 4 drives the sticky roller 3 to reverse and resets the pushing device 5 so as to clean the next group of cardboards.

[0040] Reference Figure 4An adjusting groove 11 for adjusting the height of the adhesive roller 3 is provided at the side end of the mounting frame 1. Two groups of adjusting grooves 11 are arranged, which are symmetrically distributed on both sides of the mounting frame 1. A moving groove 14 for adjusting the position of the stacking device 6 is provided at the side end of the mounting frame 1, so that the stacking device 6 releases the restriction on the discharge device 7. Two groups of moving grooves 14 are arranged, which are symmetrically distributed on both sides of the mounting frame 1. The moving groove 14 is L-shaped. A mounting plate 12 for mounting the pushing device 5 is fixedly connected to the inner end of the mounting frame 1. Two groups of mounting plates 12 are arranged, which are symmetrically distributed on both sides of the inner end of the mounting frame 1. A supporting plate 13 for supporting the pushing device 5 is fixedly connected to the side end of the mounting frame 1. Two groups of supporting plates 13 are arranged, which are symmetrically distributed on both sides of the mounting frame 1.

[0041] The above scheme is adopted: the gap between the two sets of adhesive rollers 3 can be adjusted through the adjustment slot 11 on the mounting frame 1 to adapt to cardboards of different thicknesses, and the stacking device 6 can be moved through the moving slot 14 to release the restriction of the stacking device 6 on the discharge device 7, so as to facilitate the rapid removal of the discharge device 7 and the cardboard thereon.

[0042] Reference Figure 5 Two groups of adhesive rollers 3 are provided, two ends of one group of adhesive rollers 3 respectively penetrate the mounting frame 1 and are rotatably connected to the mounting frame 1, and two ends of the other group of adhesive rollers 3 are respectively rotatably connected to the two groups of adjustment grooves 11.

[0043] By adopting the above scheme, the upper and lower surfaces of the cardboard can be glued by two sets of glue rollers 3, and the cardboard can be fully cleaned to ensure product quality.

[0044] Reference Figures 5 and 6 The driving device 4 includes a transmission wheel 1 41 fixedly connected to the end surface of a group of adhesive rollers 3 passing through the mounting frame 1, one end of the transmission wheel 1 41 is rotatably connected to a motor fixing frame 46, and the motor fixing frame 46 is fixedly connected to the mounting frame 1, one end of the motor fixing frame 46 is fixedly connected to a driving motor 42, and the output end of the driving motor 42 passes through the motor fixing frame 46 and is fixedly connected to the transmission wheel 1 41. The driving device 4 also includes a transmission wheel 2 43 arranged at the lower end of the transmission wheel 1 41, the transmission wheel 2 43 is rotatably connected to the mounting frame 1, a belt 45 is arranged between the transmission wheel 1 41 and the transmission wheel 2 43, the transmission wheel 1 41 and the transmission wheel 2 43 are connected to each other through the belt 45, one end of the transmission wheel 2 43 is fixedly connected to a gear 44, and the driving device 4 is provided with two groups, which are symmetrically distributed on both sides of the mounting frame 1.

[0045] By adopting the above scheme, the driving device 4 can synchronously control the rotation of the sticky roller 3 and drive the pushing device 5 to push the cardboard into the sticky roller 3, so that the cleaning process is efficient and coherent, ensuring that each group of cardboard can pass through the cleaning action of the sticky roller 3, thereby improving the cleaning effect and production efficiency.

[0046] Reference Figures 7 and 8The pushing device 5 includes a rack 52 meshing with the gear 44, the bottom end of the rack 52 is slidably connected to the support plate 13, the side end of the rack 52 is fixedly connected to a connecting frame 51 that penetrates the mounting frame 1, the other end of the connecting frame 51 is fixedly connected to a slider 54, the bottom end of the slider 54 is slidably connected to a slide rail 53, the slide rail 53 is fixedly connected to the top of the mounting plate 12, the top of the slider 54 is fixedly connected to a retraction box 55, a pushing rod 57 is arranged in the retraction box 55, and the top end of the pushing rod 57 penetrates the retraction box 55 and the mounting frame 1, the height of the exposed part of the pushing rod 57 after penetrating the mounting frame 1 is less than the thickness of the cardboard, and a retraction spring 56 is arranged between the bottom end of the pushing rod 57 and the bottom end of the retraction box 55. After a group of cardboards are pushed out of the unloading frame 2, the next group of cardboards will press the pushing rod 57 downward to retract it into the retraction box 55, and when the pushing rod 57 is reset, it is extended again by the retraction spring 56 to push the next group of cardboards.

[0047] By adopting the above scheme, the automatic retraction mechanism composed of the retraction box 55, the retraction spring 56 and the pushing rod 57 in the pushing device 5 can automatically reset and prepare to push the next group of cardboards after one group of cardboards are pushed out, thereby realizing automatic continuous operation and improving production efficiency.

[0048] Reference Fig. 9 The side end of the unloading frame 2 is provided with an entry groove 21 for the push rod 57 to move into the unloading frame 2 and push the cardboard in the unloading frame 2. The entry groove 21 is adapted to the push rod 57. The other side of the unloading frame 2 is provided with a push-out groove 22 for pushing the cardboard out of the unloading frame 2 during the pushing process. The height of the push-out groove 22 is greater than the thickness of one group of cardboards and less than the thickness of two groups of cardboards.

[0049] The above scheme is adopted: by adapting the entry groove 21 in the discharge frame 2 to the push rod 57, it is ensured that the cardboard smoothly enters the discharge frame 2 during the pushing process, thereby ensuring the smoothness and efficiency of the operation. The design of the push-out groove 22 can ensure that the cardboard is accurately pushed out of the discharge frame 2 during the pushing process, making the operation more precise, reducing errors, and improving product quality.

[0050] Reference Fig.10 The discharge device 7 includes a base 71 that is clamped with the mounting frame 1. The bottom end of the base 71 is fixedly connected to a universal wheel 72. Four groups of universal wheels 72 are provided and are symmetrically distributed at the bottom end of the base 71. The top of the base 71 is fixedly connected to a telescopic rod 73. The top of the telescopic rod 73 is fixedly connected to a discharge plate 74. There are multiple groups of telescopic rods 73, which are evenly distributed between the base 71 and the discharge plate 74. The outer surface of each group of telescopic rods 73 is sleeved with a group of return springs 75.

[0051] By adopting the above solution, cardboards can be automatically stacked by the unloading device 7 and the height can be kept constant by pressing down, thereby reducing the need for manual intervention and improving the operation efficiency and production speed.

[0052] Reference Fig.11 The stacking device 6 includes a connecting shaft 61 that passes through the moving groove 14, and the connecting shaft 61 passes through a connecting plate 62, one end of the connecting plate 62 is rotatably connected to a placing roller 63, and the other end of the connecting plate 62 is fixedly connected to a rotating motor 64, and the output end of the rotating motor 64 passes through the connecting plate 62 and is fixedly connected to the placing roller 63. Two groups of connecting shafts 61, connecting plates 62 and rotating motors 64 are provided, which are symmetrically distributed at both ends of the placing roller 63. The side end of the connecting plate 62 is fixedly connected to a limiting plate 65, and the inner side of the limiting plate 65 abuts against the side end of the discharge plate 74.

[0053] By adopting the above scheme, the cardboards on the discharge device 7 can be limited by the limiting plate 65 so that multiple groups of cardboards can be aligned, ensuring that the stacked cardboards are neatly arranged, improving the aesthetics and stability of the stacking, and the placing roller 63 can press down the top group of cardboards on the discharge device 7 so that the height of the cardboards remains unchanged, ensuring the compactness and stability of the cardboard stacking.

[0054] The working principle of the present invention is as follows: when in use, the cardboards to be cleaned are first stacked and placed in the discharge frame 2, and then the driving motor 42 is started to drive the sticking roller 3 to rotate, and at the same time, the gear 44 is driven to rotate through the transmission wheel 1 41, the transmission wheel 2 43 and the belt 45, so that the rack 52 moves on the support plate 13, and under the connection of the connecting frame 51, the slider 54 is driven to move on the slide rail 53, so that the push rod 57 in the retracting box 55 on the slider 54 enters the discharge frame 2 through the entry slot 21, and as the push rod 57 continues to move, the push rod 57 pushes a group of cardboards at the bottom end of the discharge frame 2 through the push slot 22, The cardboard enters between the two sets of sticky rollers 3. As the sticky rollers 3 rotate, the sticky rollers 3 will remove the dust and dirt on the surface of the cardboard, and push the cardboard to move onto the discharge plate 74, and finally insert the cardboard between the placement rollers 63 and the discharge plate 74. At this time, the driving motor 42 is stopped, and the rotating motor 64 is started, so that the rotating motor 64 drives the placement rollers 63 to rotate, thereby driving the cardboard between the placement rollers 63 and the discharge plate 74 to continue to move until the side end of the cardboard abuts against the limit plate 65, that is, the cleaning of a group of cardboards is completed, and then the driving motor 42 is reversed to rotate the gear 44, so that a group of cardboards are pushed out of the discharge frame 2. After that, the push rod 57 compressed by the next group of cardboards into the retraction box 55 exits the discharge frame 2, and under the action of the retraction spring 56, it extends out of the retraction box 55 again to complete the reset, and then repeats the operation until all the cardboards in the discharge frame 2 are cleaned; the cardboards can be automatically stacked by the discharge device 7, and the height is kept unchanged by pressing down, which reduces the need for manual intervention and improves the efficiency of operation and the speed of production. The cardboards on the discharge device 7 can be limited by the limit plate 65 to align multiple groups of cardboards, ensure that the stacked cardboards are neatly arranged, and improve the aesthetics and stability of the stacking. The placement roller 63 can be used to place the cardboards The top group of cardboards of the material device 7 is pressed down, so that the height of the cardboards remains unchanged, ensuring the compactness and stability of the cardboard stacking. The automatic retraction mechanism composed of the retraction box 55, the retraction spring 56 and the pushing rod 57 in the pushing device 5 can automatically reset after one group of cardboards is pushed out to prepare for pushing the next group of cardboards, thereby realizing automated continuous operation and improving production efficiency. The driving device 4 can synchronously control the rotation of the sticky roller 3 and drive the pushing device 5 to push the cardboards into the sticky roller 3, making the cleaning process efficient and continuous, ensuring that each group of cardboards can pass through the cleaning action of the sticky roller 3, and improving the cleaning effect and production efficiency.

[0055] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An automatic unloading device for cardboard printing, comprising: The mounting frame (1) is characterized in that a sticking roller (3) for removing dust and dirt from the upper and lower surfaces of a cardboard is arranged on the mounting frame (1), a discharge mechanism for feeding the cardboard into the sticking roller (3) is arranged on one side of the sticking roller (3), and a stacking device for stacking and placing the cleaned cardboard is arranged on the mounting frame (1); The unloading mechanism comprises a unloading frame (2) for stacking cardboards and a pushing device (5) for pushing a group of cardboards at the bottom of the unloading frame (2) into a sticking roller (3); The stacking device comprises a discharge device (7) for stacking cardboards and a stacking device (6) for pressing down a group of cardboards at the upper end of the discharge device (7) and aligning multiple groups of cardboards; A driving device (4) is provided at the side end of the adhesive roller (3), and the driving device (4) drives the adhesive roller (3) to rotate, and synchronously drives the pushing device (5) to push the cardboard into the adhesive roller (3). When the adhesive roller (3) finishes cleaning a group of cardboards, the driving device (4) drives the adhesive roller (3) to reverse, and resets the pushing device (5).

2. The automatic unloading device for cardboard printing according to claim 1, characterized in that: The side end of the mounting frame (1) is provided with an adjustment slot (11) for adjusting the height of the adhesive roller (3), the side end of the mounting frame (1) is provided with a moving slot (14) for adjusting the position of the stacking device (6) so that the stacking device (6) releases the restriction on the discharge device (7), the inner end of the mounting frame (1) is fixedly connected to a mounting plate (12) for mounting the pushing device (5), and the side end of the mounting frame (1) is fixedly connected to a support plate (13) for supporting the pushing device (5).

3. The automatic unloading device for cardboard printing according to claim 2, characterized in that: The adhesive rollers (3) are provided in two groups, one group of the adhesive rollers (3) passes through the mounting frame (1) and is rotatably connected to the mounting frame (1), and the other group of the adhesive rollers (3) is rotatably connected to the adjustment slot (11).

4. The automatic unloading device for cardboard printing according to claim 3, characterized in that: The driving device (4) comprises a transmission wheel (41) fixedly connected to the end surface of a group of adhesive rollers (3) passing through the mounting frame (1); one end of the transmission wheel (41) is rotatably connected to a motor fixing frame (46), and the motor fixing frame (46) is fixedly connected to the mounting frame (1); one end of the motor fixing frame (46) is fixedly connected to a driving motor (42); the output end of the driving motor (42) passes through the motor fixing frame (46) and is fixedly connected to the transmission wheel (41).

5. The automatic unloading device for cardboard printing according to claim 4, characterized in that: The driving device (4) further comprises a second transmission wheel (43) arranged at the lower end of the first transmission wheel (41); the second transmission wheel (43) is rotatably connected to the mounting frame (1); a belt (45) is arranged between the first transmission wheel (41) and the second transmission wheel (43); the first transmission wheel (41) and the second transmission wheel (43) are connected in transmission via the belt (45); and one end of the second transmission wheel (43) is fixedly connected to a gear (44).

6. The automatic unloading device for cardboard printing according to claim 5, characterized in that: The pushing device (5) comprises a rack (52) meshingly connected with the gear (44); the bottom end of the rack (52) is slidably connected to the support plate (13); the side end of the rack (52) is fixedly connected to a connecting frame (51) penetrating the mounting frame (1); the other end of the connecting frame (51) is fixedly connected to a slider (54); the bottom end of the slider (54) is slidably connected to a slide rail (53); the slide rail (53) is fixedly connected to the top of the mounting plate (12); the top end of the slider (54) is fixedly connected to a retraction box (55); a pushing rod (57) is arranged inside the retraction box (55); the top end of the pushing rod (57) penetrates the retraction box (55) and the mounting frame (1); a retraction spring (56) is arranged between the bottom end of the pushing rod (57) and the bottom end inside the retraction box (55).

7. The automatic unloading device for cardboard printing according to claim 6, characterized in that: The side end of the discharge frame (2) is provided with an entry slot (21) for a push rod (57) to move into the discharge frame (2) and push the paperboard in the discharge frame (2), and the other side of the discharge frame (2) is provided with a push-out slot (22) for pushing the paperboard out of the discharge frame (2) during the pushing process.

8. The automatic unloading device for cardboard printing according to claim 7, characterized in that: The material discharge device (7) comprises a base (71) clamped with the mounting frame (1); the bottom end of the base (71) is fixedly connected to a universal wheel (72); the top end of the base (71) is fixedly connected to a telescopic rod (73); the top end of the telescopic rod (73) is fixedly connected to a material discharge plate (74); and the outer surface of the telescopic rod (73) is sleeved with a return spring (75).

9. The automatic unloading device for cardboard printing according to claim 8, characterized in that: The stacking device (6) comprises a connecting shaft (61) passing through the movable groove (14), and the connecting shaft (61) passes through a connecting plate (62), one end of the connecting plate (62) is rotatably connected to a placing roller (63), and the other end of the connecting plate (62) is fixedly connected to a rotating motor (64), the output end of the rotating motor (64) passes through the connecting plate (62) and is fixedly connected to the placing roller (63), and the side end of the connecting plate (62) is fixedly connected to a limiting plate (65), and the inner side of the limiting plate (65) abuts against the side end of the material discharge plate (74).

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