A food packaging box printing device and a printing method

Abstract

The present invention relates to the technical field of packaging box printing, and particularly relates to a food packaging box printing device and a printing method, including a conveyor, on the top of which a printing machine and an air-cooling mechanism are installed. The air-cooling mechanism includes an air-cooling box, a wind guide frame, an air-cooling unit, a mounting frame, a first lower air grille, a second lower air grille and a driving member. When the packaging box cardboard just enters the air-cooling box, the second lower air grille is in a closed state, so that the wind generated by the air-cooling assembly acts on the packaging box cardboard from the first lower air grille through the wind guide frame, thereby preventing the wind at the rear end of the air-cooling box from leaking. When the entire packaging box cardboard enters the air-cooling box, the driving member drives the second lower air grille to work and convert to an open state, so that the wind generated by the air-cooling assembly is evenly distributed and acts on the packaging box cardboard from the first lower air grille and the second lower air grille, solving the problem that the existing packaging box printing and drying equipment cannot control the wind at the rear end, resulting in serious wind loss.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging box printing, and particularly relates to a food packaging box printing device and a printing method. Background Art

[0002] When producing food packaging boxes, it is necessary to print trademarks on the surface of the box body. For example, the publication number is: CN213059384U, which discloses a utility model of a new packaging box printing device, including a printing machine and a placement table arranged at the feeding port of the printing machine. A plurality of through grooves are evenly opened on the table surface of the placement table. A material pushing structure is arranged on the placement table and passes through the through grooves for pushing materials. A plurality of connecting grooves are also opened on the table surface of the placement table. Two symmetrically arranged first guide plates and two second guide plates are slidably connected in the connecting grooves. Limiting structures for restricting the sliding of the first guide plate or the second guide plate are arranged on both the first guide plate and the second guide plate. The two first guide plates are arranged on the side close to the printing machine.

[0003] After the packaging box cardboard is printed, it needs to be dried to avoid scratching the trademark during the stacking process. However, in the existing drying equipment, the internal wind force is fully turned on throughout the process. When the packaging box cardboard just enters the drying equipment, the wind force at the rear end simply cannot act on the packaging box cardboard, resulting in serious waste of wind force. Therefore, there is an urgent need for a device that can control the wind force at the rear end of the drying equipment. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a food packaging box printing device and a printing method to solve the problem that the existing packaging box printing and drying equipment cannot control the wind force at the rear end, resulting in serious loss of wind force.

[0005] Based on the above purpose, the present invention provides a food packaging box printing device, including a conveyor, on the top of which a printing machine and an air-cooling mechanism are installed. The air-cooling mechanism is arranged on one side of the printing machine. The air-cooling mechanism includes:

[0006] An air-cooling box, fixedly connected to the conveyor;

[0007] An air guide frame, arranged inside the air-cooling box, and two juxtaposed air-cooling units are installed on the top of the air guide frame;

[0008] An installation frame, arranged at the bottom of the air guide frame. A first lower air grille and a second lower air grille are arranged on the installation frame. The first lower air grille is fixedly connected to the installation frame, the second lower air grille is movably connected to the installation frame, and the number of air outlets of the first lower air grille is greater than that of the second lower air grille;

[0009] A driving member, arranged on the air-cooling box, and the driving member is in transmission connection with the second lower air grille;

[0010] Among them, the driving member drives the second lower air grille to flip, closing a part of the installation frame, so that all the wind generated by the air-cooled unit acts on the packaging box cardboard from the first lower air grille, accelerating the air-drying speed of the trademark.

[0011] Preferably, a mounting plate is provided at the top of the air-cooled box. Two circular through holes are opened at the top of the mounting plate. An upper air grille is provided at the top of each circular through hole. A filter screen is provided at the bottom of each upper air grille. All the upper air grilles and all the filter screens are detachably connected to the mounting plate.

[0012] Preferably, a clamping groove is provided beside the upper air grille. A clamping head passing through the upper air grille is provided inside the clamping groove. One end of the clamping head is inserted into the mounting plate. A number of mutually abutting first springs are provided between the clamping head and the clamping groove. At least one support block is provided on the side of the upper air grille away from the clamping groove. At least one first groove is provided on the inner ring of the circular through hole. The support block is inserted into the first groove. A second groove is provided at a place of the circular through hole away from the first groove. A push rod passes through the mounting plate at the center of the second groove.

[0013] Preferably, a second spring is inserted at the bottom of the second groove. A bullet block slidably connected in the second groove is sleeved on the top of the second spring, and the bullet block abuts against the clamping head.

[0014] Preferably, a grid plate group is provided inside the air guide frame. The size of the grid plate group is half of the size of the air guide frame. The grid plate group is located on the top of the second lower air grille. Ventilation holes are opened on one side of the grids of the grid plate group close to the printing machine. And fan blades rotatably connected are respectively arranged inside each ventilation hole.

[0015] Preferably, the second lower air grille includes:

[0016] Two linkage plates are respectively arranged close to an inner side wall of the air-cooled box;

[0017] A number of wind baffle plates, one ends of which are respectively hinged to the installation frame, and the other ends are respectively hinged to the linkage plates beside them.

[0018] Preferably, an arc-shaped through hole is opened on one side of the air-cooled box. A waist-shaped through hole is provided on the linkage plate. The driving member includes:

[0019] A connecting rod, slidably arranged in the waist-shaped through hole, and one end of the connecting rod is slidably arranged in the arc-shaped through hole;

[0020] A connecting arm, arranged inside the air-cooled box, one end of the connecting arm is hinged to the installation frame, and the other end is hinged to the connecting rod;

[0021] An electric push rod is arranged outside the air-cooling box. One end of the electric push rod is hinged to the air-cooling box, and the other end is hinged to the connecting rod.

[0022] Preferably, first photoelectric sensors are respectively arranged on the sides of the air-cooling box. Each first photoelectric sensor is located between the first lower air grille and the second lower air grille, and each first photoelectric sensor is electrically connected to the electric push rod.

[0023] Preferably, two second photoelectric sensors are arranged on the side of the air-cooling box close to the printing machine, and each second photoelectric sensor is mounted on the conveyor.

[0024] A printing method of a food packaging box printing device includes the following steps:

[0025] S1: Feed the packaging box cardboard into the printing machine through the conveyor for trademark printing treatment.

[0026] S2: Feed the printed packaging box cardboard into the air-cooling box through the conveyor.

[0027] S3: When the packaging box cardboard just enters the air-cooling box, the second lower air grille is in a closed state. The wind generated by the air-cooling unit is all applied to the packaging box cardboard from the first lower air grille through the air guide frame. On the one hand, it is used to reduce the loss and waste of the wind at the rear end of the air-cooling box, and on the other hand, it is used to increase the wind at the front end of the air-cooling box and improve the drying efficiency.

[0028] S4: When the packaging box cardboard completely enters the air-cooling box, drive the second lower air grille to work through the driving member, and it is converted from the closed state to the open state, so that the wind generated by the air-cooling component is evenly distributed and acts on the packaging box cardboard from the first lower air grille and the second lower air grille to dry the trademark.

[0029] S5: When the packaging box cardboard is moved out of the air-cooling box through the conveyor and enters the next process, drive the second lower air grille to perform a reset operation through the driving member, and it is converted from the open state to the closed state, so that the wind at the front end of the air-cooling box is increased to continue drying the next packaging box cardboard.

[0030] Advantages of the present invention: The cardboard boxes processed by the printing machine are sent into the air-cooling box through the conveyor. When the cardboard boxes of the packaging boxes first enter the air-cooling box, the second lower air grille is in a closed state, so that the wind generated by the air-cooling component passes through the air guide frame and all acts on the cardboard boxes of the packaging boxes from the first lower air grille, so that the wind at the rear end of the air-cooling box will not be lost. When all the cardboard boxes of the packaging boxes enter the air-cooling box, the second lower air grille is driven by the driving member to work and is converted into an open state, so that the wind generated by the air-cooling component is evenly distributed and acts on the cardboard boxes of the packaging boxes from the first lower air grille and the second lower air grille, solving the problem that the existing packaging box printing and drying equipment cannot control the wind at the rear end, resulting in serious wind loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only those of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0032] Figure 1 It is a schematic structural diagram of the whole embodiment of the present invention;

[0033] Figure 2 It is an embodiment of the present invention Figure 1 The enlarged structural diagram at A;

[0034] Figure 3 It is a schematic perspective structural diagram inside the air-cooling box of the embodiment of the present invention;

[0035] Figure 4 It is an embodiment of the present invention Figure 3 The enlarged structural diagram at B;

[0036] Figure 5 It is a schematic plan view of the top of the air-cooling box of the embodiment of the present invention;

[0037] Figure 6 It is an embodiment of the present invention Figure 5 The enlarged structural diagram at C.

[0038] The labels in the figure are:

[0039] 1. Conveyor; 2. Printing press; 3. Air-cooling box; 4. Air guide frame; 5. Air-cooling unit; 6. Installation frame; 7. First lower air grille; 8. Second lower air grille; 9. Installation plate; 10. Circular through-hole; 11. Upper air grille; 12. Filter screen; 13. Card slot; 14. Card head; 15. First spring; 16. Support block; 17. First groove; 18. Second groove; 19. Push rod; 20. Second spring; 21. Elastic block; 22. Grid plate group; 23. Ventilation hole; 24. Fan blade; 25. Linking plate; 26. Windshield; 27. Arc-shaped through-hole; 28. Waist-shaped through-hole; 29. Connecting rod; 30. Electric push rod; 31. First photoelectric inductor; 32. Second photoelectric inductor. Detailed implementation manner

[0040] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with specific embodiments.

[0041] It should be noted that unless otherwise defined, the technical terms or scientific terms used in the present invention should have the ordinary meanings understood by those with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or objects appearing before this term cover the elements or objects listed after this term and their equivalents, without excluding other elements or objects. The terms such as "connection" or "coupling" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left" and "right" are only used to represent relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0042] As Figures 1 to 6 shown, a food packaging box printing device includes a conveyor 1, on the top of which a printing press 2 and an air-cooling mechanism are installed. The air-cooling mechanism is arranged on one side of the printing press 2, and the air-cooling mechanism includes:

[0043] An air-cooling box 3, fixedly connected to the conveyor 1;

[0044] An air guide frame 4, arranged inside the air-cooling box 3, and two air-cooling units 5 arranged in parallel are installed on the top of the air guide frame 4;

[0045] An installation frame 6, arranged at the bottom of the air guide frame 4. The installation frame 6 is provided with a first lower air grille 7 and a second lower air grille 8. The first lower air grille 7 is fixedly connected to the installation frame 6, the second lower air grille 8 is movably connected to the installation frame 6, and the number of air outlets of the first lower air grille 7 is greater than the number of air outlets of the second lower air grille 8;

[0046] A driving member is arranged on the air-cooling box 3, and the driving member is in transmission connection with the second lower air grille 8;

[0047] Wherein, the driving member drives the second lower air grille 8 to turn over, closing a part of the installation frame 6, so that all the wind generated by the air-cooling unit 5 acts on the packaging box cardboard from the first lower air grille 7, accelerating the air-drying speed of the trademark.

[0048] For example, the packaging box cardboard processed by the printing press 2 is sent into the air-cooling box 3 through the conveyor 1. When the packaging box cardboard just enters the air-cooling box 3, the second lower air grille 8 is in a closed state, so that the wind generated by the air-cooling assembly all acts on the packaging box cardboard from the first lower air grille 7 through the air guide frame 4, so that the wind at the rear end of the air-cooling box 3 will not be lost. When the packaging box cardboard completely enters the air-cooling box 3, the driving member drives the second lower air grille 8 to work and turn into an open state, so that the wind generated by the air-cooling assembly is evenly distributed and acts on the packaging box cardboard from the first lower air grille 7 and the second lower air grille 8, solving the problem that the existing packaging box printing and drying equipment cannot control the wind at the rear end, resulting in serious wind loss, and realizing the problems of energy conservation and consumption reduction and accelerating the drying of the printed trademark.

[0049] As an optional embodiment, a mounting plate 9 is provided at the top of the air-cooling box 3. Two circular through holes 10 are opened at the top of the mounting plate 9. An upper air grille 11 is provided at the top of each circular through hole 10. A filter screen 12 is provided at the bottom of each upper air grille 11, and all the upper air grilles 11 and all the filter screens 12 are detachably connected to the mounting plate 9.

[0050] By providing the mounting plate 9 at the top of the air-cooling box 3, providing the circular through holes 10 on the mounting plate 9, and installing the upper air grilles 11 and the filter screens 12 in the circular through holes 10, when the air-cooling unit 5 sucks in external air, the filter screen 12 blocks dust and prevents it from entering the air-cooling box 3 and acting on the packaging box cardboard, affecting the quality of the trademark, realizing the problem that the air-cooling box 3 has a dust-proof function.

[0051] As an optional embodiment, a clamping groove 13 is provided beside the upper air grille 11. A clamping head 14 passing through the upper air grille 11 is provided inside the clamping groove 13. One end of the clamping head 14 is inserted into the mounting plate 9. A plurality of mutually abutting first springs 15 are provided between the clamping head 14 and the clamping groove 13. At least one support block 16 is provided on the side of the upper air grille 11 away from the clamping groove 13. At least one first groove 17 is provided on the inner ring of the circular through hole 10. The support block 16 is inserted into the first groove 17. A second groove 18 is provided at a place of the circular through hole 10 away from the first groove 17, and a push rod 19 passes through the mounting plate 9 at the center of the second groove 18.

[0052] For example, the general fixing method of the upper air grille 11 is to fasten the four sides with bolts. When there is too much dust inside the filter screen 12 and it needs to be removed for cleaning, the disassembly of the upper air grille 11 is very time-consuming and laborious. In this description, by installing a clamping groove 13, a clamping head 14, a first spring 15 and a support block 16 on the upper air grille 11, by setting a first groove 17, a second groove 18 and a push rod 19 on the mounting plate 9, by putting the clamping groove 13 into the first groove 17, and by inserting the clamping head 14 into the second groove 18 to achieve the fixing effect, and by inserting the support block 16 into the mounting plate 9, so that the upper air grille 11 is fixed in the mounting plate 9. By the push rod 19 abutting against the clamping head 14 to move, and by the clamping head 14 abutting against the first spring 15 to retract into the clamping groove 13, the upper air grille 11 can be quickly taken out from the mounting plate 9, solving the problem that the disassembly of the upper air grille 11 is very time-consuming and laborious, and realizing the problem that the upper air grille 11 is convenient to disassemble and clean.

[0053] As an alternative embodiment, a second spring 20 is inserted at the bottom of the second groove 18, a spring block 21 which is sleeved at the top of the second spring 20 and is slidably connected in the second groove 18 is provided, and the spring block 21 abuts against the clamping head 14.

[0054] For example, by installing the second spring 20 and the spring block 21 in the second groove 18, when the push rod 19 abuts against the clamping head 14 and moves it into the clamping groove 13, the second spring 20 drives the spring block 21 to move upward, and the spring block 21 drives the clamping groove 13 to move upward, so that the upper air grille 11 quickly bounces upward, solving the problem that the push rod 19 needs to be continuously pressed when the upper air grille 11 is taken out from the mounting plate 9, and realizing the problem that the upper air grille 11 quickly bounces up and is taken out from the mounting plate 9.

[0055] As an alternative embodiment, a well grid plate group 22 is arranged inside the air guiding frame 4. The size of the well grid plate group 22 is half of the size of the air guiding frame 4. The well grid plate group 22 is located at the top of the second lower air grille 8. Ventilation holes 23 are respectively formed in the wells of the well grid plate group 22 close to the side of the printing machine 2, and fan blades 24 which are rotatably connected are respectively arranged inside each ventilation hole 23.

[0056] By setting the grid plate group 22 and opening a plurality of ventilation holes 23 in the grid plate group 22, when the air outlet of the second lower air grille 8 is closed, the cold air blown out by the air-cooled unit 5 is converged to the first lower air grille 7 through the plurality of ventilation holes 23, so as to increase the wind force at the first lower air grille 7, solve the problem that the cold air blown out by the air-cooled unit 5 at the top of the second lower air grille 8 cannot all act on the first lower air grille 7, and realize the problem that the cold air blown out by the two air-cooled units 5 is converged at the first lower air grille 7. By installing fan blades 24 in the ventilation holes 23, the wind force at the first lower air grille 7 is further increased, solve the problem of insufficient wind force at the first lower air grille 7, and realize the problem of further strengthening the wind force at the first lower air grille 7.

[0057] As an alternative embodiment, the second lower air grille 8 includes:

[0058] Two linkage plates 25, respectively arranged close to an inner side wall of the air-cooled box 3;

[0059] A plurality of windshields 26, one end of each of which is hinged to the mounting frame 6, and the other side of the other end is respectively hinged to the linkage plate 25.

[0060] For example, when the packaging box cardboard just enters the air-cooled box 3, the air outlet is closed by the windshields 26, so that the cold air at the top of the second lower air grille 8 is converged into the first lower air grille 7. When the packaging box cardboard completely enters the air-cooled box 3, the linkage plate 25 is driven to move by the driving member, and the windshields 26 are driven to move and turn by the linkage plate 25. At this time, the windshields 26 open the air outlet, so that the cold air acts on the packaging box cardboard through the windshields 26, realizing the method of closing the rear air outlet to increase the wind force of the front air outlet and accelerating the drying of the trademarks printed on the packaging box cardboard.

[0061] As an alternative embodiment, an arc-shaped through hole 27 is opened on one side of the air-cooled box 3, a waist-shaped through hole 28 is provided on the linkage plate 25, and the driving member includes:

[0062] A connecting rod 29, slidably arranged in the waist-shaped through hole 28, and one end of the connecting rod 29 is slidably arranged in the arc-shaped through hole 27;

[0063] An electric push rod 30, arranged on the outside of the air-cooled box 3, one end of the electric push rod 30 is hinged to the air-cooled box 3, and the other end is hinged to the connecting rod 29.

[0064] For example, the connecting rod 29 is driven to move by the electric push rod 30, the connecting rod 29 moves in the arc-shaped through hole 27, the connecting rod 29 drives the linkage plate 25 to move in the waist-shaped through hole 28, and the linkage plate 25 drives the windshields 26 to move, so that the windshields 26 have an open and closed state, realizing the problem of automatic opening and closing of the windshields 26.

[0065] As an alternative embodiment, first photoelectric sensors 31 are respectively arranged on the sides of the air-cooling box 3. Each of the first photoelectric sensors 31 is located between the first lower air grille 7 and the second lower air grille 8, and each of the first photoelectric sensors 31 is electrically connected to the electric push rod 30.

[0066] For example, by installing the first photoelectric sensor 31 in the middle of the air-cooling box 3, after the first photoelectric sensor 31 detects that the cardboard of the packing box has passed through, the detection information is transmitted to the electric push rod 30, so that the electric push rod 30 adjusts the windshield 26 to the open state, solving the problem that the windshield 26 cannot judge that the cardboard of the packing box has completely entered the air-cooling box 3, and realizing the problem of automatically sensing the cardboard of the packing box and opening the windshield 26.

[0067] As an alternative embodiment, two second photoelectric sensors 32 are arranged on one side of the air-cooling box 3 close to the printing machine 2, and each of the second photoelectric sensors 32 is mounted on the conveyor 1.

[0068] For example, by installing the second photoelectric sensor 32 between the air-cooling box 3 and the printing machine 2, when the cardboard of the packing box is in the printing machine 2, since the second photoelectric sensor 32 has no target to detect, the air-cooling unit 5 stops working, saving power consumption. When the cardboard of the packing box is sent out from the printing machine 2 and detected by the second photoelectric sensor 32, the detection information is transmitted to the air-cooling unit 5 through the second photoelectric sensor 32 to start working. In order to prevent the second photoelectric sensor 32 from losing detection after the cardboard of the packing box has completely entered the air-cooling box 3 and causing the air-cooling unit 5 to stop working, when the cardboard of the packing box has completely entered the air-cooling box 3 and is detected by the first photoelectric sensor 31, the first photoelectric sensor 31 controls the air-cooling unit 5 to continue working, so that the air-cooling unit 5 cannot stop working, solving the problem that when the cardboard of the packing box is in the printing machine 2, the air-cooling unit 5 has been working, which is very wasteful of electricity, and realizing the problem that the air-cooling unit 5 adjusts to start or stop working according to the position of the cardboard of the packing box on the conveyor 1.

[0069] A printing method for a food packing box printing device includes the following steps:

[0070] S1: Feeding the cardboard of the packing box into the printing machine 2 through the conveyor 1 for trademark printing treatment;

[0071] S2: Feeding the printed cardboard of the packing box into the air-cooling box 3 through the conveyor 1;

[0072] S3: When the packaging box cardboard just enters the air-cooling box 3, the second lower air grille 8 is in a closed state, and the wind generated by the air-cooling unit 5 is all applied to the packaging box cardboard from the first lower air grille 7 through the air guide frame 4. On the one hand, it is used to reduce the loss and waste of the wind at the rear end of the air-cooling box 3, and on the other hand, it is used to increase the wind at the front end of the air-cooling box 3 and improve the drying efficiency;

[0073] S4: When the packaging box cardboard completely enters the air-cooling box 3, the second lower air grille 8 is driven to work by the driving member, and it is changed from the closed state to the open state, so that the wind generated by the air-cooling assembly is evenly distributed and acts on the packaging box cardboard from the first lower air grille 7 and the second lower air grille 8 to dry the trademark;

[0074] S5: When the packaging box cardboard is removed from the air-cooling box 3 by the conveyor 1 and enters the next process, the second lower air grille 8 is driven to reset by the driving member, and it is changed from the open state to the closed state, so that the wind at the front end of the air-cooling box 3 is increased to continue drying the next packaging box cardboard.

[0075] Those of ordinary skill in the art should understand that the discussion of any embodiment above is only exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above, which are not provided in detail for the sake of brevity.

[0076] The present invention aims to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A food packaging box printing device, including a conveyor (1), on the top of which a printing machine (2) and an air-cooling mechanism are installed. The air-cooling mechanism is arranged on one side of the printing machine (2), and is characterized in that, The air-cooling mechanism includes: An air-cooling box (3), fixedly connected to the conveyor (1); An air guide frame (4), arranged inside the air-cooling box (3), and two air-cooling units (5) arranged side by side are mounted on the top of the air guide frame (4); A mounting frame (6), arranged at the bottom of the air guide frame (4), the mounting frame (6) is provided with a first lower air grille (7) and a second lower air grille (8), the first lower air grille (7) is fixedly connected to the mounting frame (6), the second lower air grille (8) is movably connected to the mounting frame (6), and the number of air outlets of the first lower air grille (7) is greater than that of the second lower air grille (8); A driving member, arranged on the air-cooling box (3), and the driving member is in transmission connection with the second lower air grille (8); Wherein, the driving member drives the second lower air grille (8) to flip, closing a part of the mounting frame (6), so that the wind generated by the air-cooling unit (5) all acts on the packaging box cardboard from the first lower air grille (7), accelerating the air-drying speed of the trademark mark; The top of the air-cooling box (3) is provided with a mounting plate (9), two circular through holes (10) are opened on the top of the mounting plate (9), an upper air grille (11) is arranged on the top of each circular through hole (10), a filter screen (12) is arranged at the bottom of each upper air grille (11), and all the upper air grilles (11) and all the filter screens (12) are detachably connected to the mounting plate (9); A clamping groove (13) is arranged beside the upper air grille (11), a clamping head (14) passing through the upper air grille (11) is arranged inside the clamping groove (13), one end of the clamping head (14) is inserted into the mounting plate (9), a plurality of mutually abutting first springs (15) are arranged between the clamping head (14) and the clamping groove (13), at least one support block (16) is arranged on one side of the upper air grille (11) away from the clamping groove (13), at least one first groove (17) is arranged on the inner ring of the circular through hole (10), the support block (16) is inserted into the first groove (17), a second groove (18) is arranged at a place of the circular through hole (10) away from the first groove (17), and a push rod (19) passes through the mounting plate (9) at the center of the second groove (18); A second spring (20) is inserted at the bottom of the second groove (18), a bullet block (21) slidably connected inside the second groove (18) is sleeved on the top of the second spring (20), and the bullet block (21) abuts against the clamping head (14).

2. The printing device for a food packaging box according to claim 1, wherein, An inner grid plate group (22) is arranged inside the air guide frame (4), the size of the inner grid plate group (22) is half of the size of the air guide frame (4), the inner grid plate group (22) is located on the top of the second lower air grille (8), ventilation holes (23) are opened on the inner grids of the inner grid plate group (22) close to the printing machine (2), and a fan blade (24) rotatably connected is mounted inside each ventilation hole (23).

3. The printing device for a food packaging box according to claim 1, characterized in that, The second lower air grille (8) includes: Two linkage plates (25), respectively arranged close to an inner side wall of the air-cooling box (3); A plurality of wind baffle plates (26), one end of each of which is hinged to the mounting frame (6), and the other side of the other end is respectively hinged to the linkage plate (25).

4. The printing device for a food packaging box according to claim 3, characterized in that, An arc-shaped through hole (27) is formed in one side of the air-cooling box (3), a kidney-shaped through hole (28) is formed in the linkage plate (25), and the driving member includes: A connecting rod (29), slidably arranged in the kidney-shaped through hole (28), and one end of the connecting rod (29) is slidably arranged in the arc-shaped through hole (27); A connecting arm, arranged inside the air-cooling box (3), one end of the connecting arm is hinged to the mounting frame (6), and the other end is hinged to the connecting rod (29); An electric push rod (30), arranged outside the air-cooling box (3), one end of the electric push rod (30) is hinged to the air-cooling box (3), and the other end is hinged to the connecting rod (29).

5. A food packaging box printing device according to claim 4, characterized in that, A first photoelectric inductor (31) is respectively arranged on the side of the air-cooling box (3), each first photoelectric inductor (31) is located between the first lower air grille (7) and the second lower air grille (8), and each first photoelectric inductor (31) is electrically connected to the electric push rod (30).

6. The printing device for a food packaging box according to claim 4, wherein Two second photoelectric inductors (32) are arranged on the side of the air-cooling box (3) close to the printing machine (2), and each second photoelectric inductor (32) is mounted on the conveyor (1).

7. A printing method of a printing device for a food packaging box according to claim 1, characterized in that, Comprising the following steps: S1: Feeding the packaging box cardboard into the printing machine (2) through the conveyor (1) for trademark printing treatment; S2: Feeding the printed packaging box cardboard into the air-cooling box (3) through the conveyor (1); S3: When the packaging box cardboard just enters the air-cooling box (3), the second lower air grille (8) is in a closed state, and the wind generated by the air-cooling unit (5) is all applied to the packaging box cardboard from the first lower air grille (7) through the air guiding frame (4). On the one hand, it is used to reduce the loss and waste of the wind at the rear end of the air-cooling box (3), and on the other hand, it is used to increase the wind at the front end of the air-cooling box (3) and improve the drying efficiency; S4: When the packaging box cardboard completely enters the air-cooling box (3), driving the second lower air grille (8) to work through the driving member, changing from the closed state to the open state, so that the wind generated by the air-cooling assembly is evenly distributed and acts on the packaging box cardboard from the first lower air grille (7) and the second lower air grille (8) to dry the trademark; S5: When the packaging box cardboard is moved out of the air-cooling box (3) through the conveyor (1) and enters the next process, driving the second lower air grille (8) to perform a reset operation through the driving member, changing from the open state to the closed state, so as to increase the wind at the front end of the air-cooling box (3) and continue to dry the next packaging box cardboard.

Images