A drying oven for a gravure printing machine

Abstract

The utility model relates to printing machine technical field, concretely relates to a kind of drying oven of gravure printing machine, comprising: the front box of one end opening, front box is fixedly installed on gravure printing machine;The rear box of one end opening, rear box and front box can be opened and closed butt joint;Mobile guide mechanism, mobile guide mechanism is installed between the rear box and gravure printing machine, for driving and guiding the rear box relative to the front box linear movement, realize the butt joint closure or separation between the front box and the rear box;Auxiliary guide roller group, auxiliary guide roller group is installed in the front box, for supporting and guiding printing film to run in drying oven;Air duct system, air duct system is arranged in the rear box, for drying treatment to printing film in drying oven;The utility model is opened and closed by the front box and rear box cooperation mobile guide mechanism, so that rear box can one-key type stable opening and closing, provides great convenience for film threading, guide roller cleaning and other routine maintenance.

Description

Technical Field

[0001] This utility model relates to the field of printing press technology, specifically to a drying oven for a gravure printing machine. Background Technology

[0002] In gravure printing, the ink adhering to the surface of the substrate (such as film or paper) after printing needs to be dried and cured immediately to ensure printing quality and achieve high-speed continuous production. The drying oven is a key component to accomplish this function.

[0003] Currently, most gravure printing machine drying chambers adopt a single air duct design, namely one hot air inlet and one exhaust outlet. Existing gravure printing machine drying chambers have several main drawbacks: First, the uneven distribution of air pressure and volume within the long drying chamber leads to significant differences in drying effect at different distances from the air outlet, affecting product quality consistency; second, the long flow path of exhaust gas within the chamber makes it prone to accumulating in dead corners, affecting drying efficiency and posing a safety hazard due to excessive solvent concentration; third, existing drying chambers are often bulky and difficult to open, causing difficulties in material loading, cleaning, and maintenance. Utility Model Content

[0004] The purpose of this utility model is to overcome at least one of the defects of existing gravure printing machine drying boxes. To achieve the purpose of this utility model, the following technical solution is adopted:

[0005] A drying chamber for a gravure printing machine, comprising:

[0006] A front housing with an opening at one end, the front housing being fixedly mounted on a gravure printing machine;

[0007] A rear box with an opening at one end, which can be opened and closed to the front box, and together they form a sealed drying space when the front box and the rear box are closed.

[0008] A moving guide mechanism is installed between the rear box and the gravure printing machine to drive and guide the rear box to move linearly relative to the front box, thereby realizing the docking closure or separation between the front box and the rear box.

[0009] An auxiliary guide roller assembly is installed inside the front housing to support and guide the printed film as it moves within the drying chamber.

[0010] An air duct system, located within the rear chamber, is used to dry the printed film inside the drying chamber.

[0011] A further improvement is that the gravure printing machine includes multiple sets of printing mechanisms arranged side by side. Each set of printing mechanisms includes two wall panels, and each set of printing mechanisms is equipped with a drying box. The front body of the drying box is fixedly installed between the two wall panels. The wall panels on the same side of two adjacent sets of printing mechanisms are connected to each other by a crossbeam.

[0012] A further improvement is that the moving guide mechanism includes:

[0013] A linear slide rail, which is fixedly installed on the crossbeam connecting the adjacent printing mechanism wall panel;

[0014] A pulley block, wherein the pulley block is mounted on both sides of the rear housing via a mounting bracket and is rotatably fitted onto the linear slide rail;

[0015] The driving mechanism is a cylinder. The cylinder body is fixed on the crossbeam. The piston rod end of the cylinder is connected to the rear box through a rod end bearing. The piston rod extension and retraction movement drives the rear box to move along the linear slide rail through the pulley group, realizing docking and closing or separation with the front box.

[0016] A further improvement is that the air duct system includes an air inlet channel, an air distribution structure, a spray structure, and an exhaust channel disposed on the rear housing; wherein, the air duct system is configured to allow hot air to enter the drying space through the air inlet channel, be evenly distributed by the air distribution structure, and then be guided by the spray structure to print a thin film, and the exhaust gas after heat exchange is discharged through the exhaust channel.

[0017] A further improvement is that the rear box includes a rear box outer shell and a rear box inner liner, the rear box inner liner forming the internal flow channel of the air duct system, the rear box outer shell covering the outside of the rear box inner liner, wherein a gap is formed between the rear box inner liner and the rear box outer shell, the gap forming part of the exhaust channel.

[0018] A further improvement is that the air intake channel includes two air inlets respectively opened at the upper and lower parts of the rear box, and the air inlets are connected to an external hot air device through high-temperature resistant hoses.

[0019] A further improvement is that the air distribution structure consists of two sets of flow guide plates disposed inside the rear box liner and corresponding to the two air inlets. The flow guide plates are used to divide the rear box liner cavity into multiple independent flow channels.

[0020] A further improvement is that the blowing structure consists of multiple air nozzles located on the side wall of the rear box inner liner facing the printing film, with the air nozzles of all nozzles pointing directly at the printing film on the surface of the auxiliary guide roller assembly.

[0021] A further improvement is that the exhaust duct also includes two upper and lower exhaust pipes disposed between the rear box outer shell and the rear box inner liner. The exhaust pipes have several openings on their walls to guide the exhaust gas flowing through the gap into the exhaust pipes. The rear box is provided with two upper and lower exhaust ports corresponding to the two exhaust pipes. The exhaust pipes are connected to the exhaust ports to discharge the exhaust gas to an external recycling device.

[0022] A further improvement is that the outer walls of the rear box are covered with a heat insulation layer.

[0023] The beneficial effects of this utility model are as follows:

[0024] This invention utilizes an openable front and rear chamber with a movable guide mechanism, enabling the rear chamber to open and close smoothly with a single button, greatly facilitating routine maintenance such as film threading and guide roller cleaning. By employing dual upper and lower air inlets with internal airflow guide plates, it ensures even distribution of hot air within the drying chamber. Combined with multi-point nozzles for precise spraying, it solves the problems of uneven airflow and dead zones inherent in traditional drying chambers, resulting in uniform heating of the printed film and stable, reliable drying quality. A gap between the inner liner and outer shell of the rear chamber, along with two upper and lower air outlet pipes, allows for rapid exhaust of waste gas, preventing accumulation and poor ventilation. Attached Figure Description

[0025] Figure 1 This is a partial sectional view of the installation structure of the drying chamber of a gravure printing machine according to the present invention;

[0026] Figure 2 This is a schematic diagram of the internal structure of the rear compartment;

[0027] Figure 3 for Figure 1 View from A-axis (front housing structure not shown);

[0028] Figure 4 for Figure 3 Enlarged schematic diagram of the structure at point B.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Wall panel; 2. Raised panel; 3. Front housing; 4. Rear housing; 5. Air inlet; 6. Air outlet; 7. Opening; 8. Air outlet duct; 9. Rear housing liner; 10. Rear housing outer shell; 11. Air nozzle; 12. Air guide plate; 13. Printed film; 14. Auxiliary guide roller assembly; 15. Mounting frame; 16. Pulley assembly; 17. Linear slide rail; 18. Insulation layer; 19. Cylinder; 20. Crossbeam. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. These drawings are simplified schematic diagrams, illustrating only the basic structure of this utility model; therefore, the drawings only show the components relevant to this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0032] It should be noted that when a component is said to be "mounted" on another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected" to another component, it can be directly connected to the other component or there may be an intervening component.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The terms “and” and “and” as used herein include any and all combinations of one or more of the associated listed items.

[0034] Please refer to the attached document. Figure 1 -Appendix Figure 4 This utility model embodiment proposes a drying oven for a gravure printing machine, comprising:

[0035] A front housing 3 with an opening at one end is fixedly mounted on a gravure printing machine.

[0036] The rear box 4 is open at one end and can be connected to the front box 3 in an openable manner. When the front box 3 and the rear box 4 are connected and closed, they together form a sealed drying space.

[0037] A moving guide mechanism is installed between the rear box 4 and the gravure printing machine to drive and guide the rear box 4 to move linearly relative to the front box 3, thereby realizing the docking closure or separation between the front box 3 and the rear box 4.

[0038] An auxiliary guide roller assembly 14 is installed inside the front housing 3 to support and guide the printed film 13 as it moves within the drying chamber.

[0039] An air duct system is installed inside the rear chamber 4 and is used to dry the printed film 13 inside the drying chamber.

[0040] It is understood that the opening of the front housing 3 matches the outline of the opening of the rear housing 4, so that the front housing 3 and the rear housing 4 can be connected and closed. The auxiliary guide roller group 14 includes several guide rollers. The bottom of the front housing 3 is provided with a printing film 13 inlet, and the top of the front housing 3 is provided with a printing film 13 outlet. The several guide rollers are arranged at intervals from bottom to top from the inlet to the outlet in the front housing 3.

[0041] This utility model adopts a modular design with a fixed front box 3 and a movable rear box 4. The rear box 4 is opened and closed automatically through a moving guide mechanism, so as to easily open or close the sealed drying space formed by the two. When the two are separated, the rear box 4 can be moved away as a whole, providing a large operating space for the printing film 13 to be threaded and the maintenance work such as cleaning the guide rollers, which significantly improves the convenience and safety of operation.

[0042] In this embodiment, the gravure printing machine includes multiple sets of printing mechanisms arranged side by side. Each set of printing mechanisms includes two wall panels 1, and each set of printing mechanisms is equipped with a drying chamber. The front body 3 of the drying chamber is fixedly installed between the two wall panels 1. The wall panels 1 on the same side of adjacent sets of printing mechanisms are connected to each other by a crossbeam 20. A heightening plate 2 is also provided on the top of each wall panel 1.

[0043] Understandably, each printing unit is equipped with an independent drying chamber to ensure that the printed film 13 can be dried immediately after each printing process. Each printing unit contains two wall panels 1 on the left and right, and the front chamber 3 of the drying chamber is fixed between the two wall panels 1. The wall panels 1 on the same side of adjacent printing units are connected by a crossbeam 20. The crossbeam 20 not only enhances the overall structural rigidity between multiple printing units, but also provides a fixed carrier for the moving guide mechanism. There is no need to design an additional complex support frame, making the overall structure more compact. Multiple drying chambers work simultaneously to meet the continuous production needs of multi-color printing.

[0044] Specifically, in this embodiment, the moving guide mechanism includes:

[0045] Linear slide rail 17 is fixedly installed on the crossbeam 20 that connects the adjacent printing mechanism wall panel 1.

[0046] The pulley assembly 16 is mounted on both sides of the rear housing 4 via a mounting bracket 15 and can be rotatably fitted onto the linear slide rail 17.

[0047] The driving mechanism is a cylinder 19. The cylinder body of the cylinder 19 is fixed on the crossbeam 20. The piston rod end of the cylinder 19 is connected to the rear box 4 through the rod end bearing. The piston rod extension and retraction movement drives the rear box 4 to move along the linear slide rail 17 through the pulley block 16, so as to realize the docking and closing or separation with the front box 3.

[0048] Understandably, the linear guide rail 17 is fixed to the crossbeam 20 connecting the adjacent wall panel 1, providing high-precision guidance; the pulley block 16 is installed on both sides of the rear housing 4 and fitted into the linear guide rail 17, achieving low-friction rolling movement; the cylinder 19 serves as the drive source, its cylinder body is fixed to the crossbeam 20, and its piston rod is connected to the rear housing 4 through the rod end bearing. Its extension and retraction motion directly drives the rear housing 4 to move back and forth linearly along the linear guide rail 17. The cylinder 19 drive method is simple, direct, powerful, and has a fast response speed, enabling it to quickly complete the opening and closing action.

[0049] In this embodiment, the air duct system includes an air inlet channel, an air distribution structure, a spray structure, and an exhaust channel disposed on the rear housing 4; wherein, the air duct system is configured to allow hot air to enter the drying space through the air inlet channel, be evenly distributed by the air distribution structure, and then be guided by the spray structure to the printed film 13, and the exhaust gas after heat exchange is discharged through the exhaust channel.

[0050] Specifically, the rear box 4 includes a rear box outer shell 10 and a rear box inner liner 9. The rear box inner liner 9 constitutes the internal flow channel of the air duct system. The rear box outer shell 10 covers the outside of the rear box inner liner 9. A gap is formed between the rear box inner liner 9 and the rear box outer shell 10, and this gap constitutes part of the exhaust channel.

[0051] Understandably, the rear box outer shell 10 covers the outside of the rear box inner liner 9, forming a gap. This gap is cleverly used as part of the exhaust channel to collect the exhaust gas after heat exchange. The exhaust gas after heat exchange can flow along the gap to the air outlet 6.

[0052] In this embodiment, the air inlet channel includes two air inlets 5 respectively opened at the upper and lower parts of the rear box 4, and the air inlets 5 are connected to an external hot air device (not shown in the figure) through a high-temperature resistant hose.

[0053] The air distribution structure consists of two sets of flow guide plates 12 disposed inside the rear box liner 9 and corresponding to the two air inlets 5. The flow guide plates 12 are used to divide the cavity of the rear box liner 9 into multiple independent flow channels.

[0054] Understandably, the dual air inlets 5 design allows hot air to enter the rear box liner 9 simultaneously from both the top and bottom of the rear box 4, avoiding the problem of hot air concentration on one side caused by a single air inlet 5. Compared to the long-distance air delivery of a single air inlet 5, the dual air inlets 5 greatly shorten the distance for hot air to reach the farthest nozzle 11, effectively reducing the attenuation of wind pressure and air volume, and making the air output of each nozzle 11 more uniform.

[0055] Specifically, each set of guide plates 12 consists of multiple parallel metal plates. When hot air enters from the air inlet 5, it is guided by the guide plates 12, so that the hot air from the upper and lower air inlets 5 is directionally distributed to the corresponding flow channels.

[0056] Specifically, the blowing structure consists of multiple air nozzles 11 located on the side wall of the rear inner liner 9 facing the printing film 13, with the air nozzles of all the air nozzles 11 facing the printing film 13 on the surface of the auxiliary guide roller group 14.

[0057] Understandably, the jet stream formed by the nozzle 11 has a high impact force, which can quickly blow away the solvent vapors evaporating from the surface of the printed film 13, while efficiently transferring heat to the printed film 13 to accelerate ink drying.

[0058] Specifically, in this embodiment, there are 9 air nozzles 11, with 5 air nozzles 11 corresponding to the upper air inlet 5 and 4 air nozzles 11 corresponding to the lower air inlet 5.

[0059] In this embodiment, the exhaust duct further includes two upper and lower exhaust pipes 8 disposed between the rear outer shell 10 and the rear inner liner 9. The exhaust pipe 8 has several openings 7 on its wall, which are used to guide the exhaust gas flowing through the gap into the exhaust pipe 8. The rear box 4 is provided with two upper and lower exhaust ports 6 corresponding to the two exhaust pipes 8. The exhaust pipes 8 are connected to the exhaust ports 6 to discharge the exhaust gas to an external recycling device (not shown in the figure).

[0060] Specifically, each exhaust duct 8 is provided with two rows of openings 7, one above the other, arranged in a stepped pattern from large to small, to ensure that the exhaust gas in the gaps flows into the exhaust duct 8 evenly and efficiently. By setting up two exhaust ducts 8, a nearby exhaust path is formed, reducing the residence time of exhaust gas in the drying chamber and lowering the safety risks and the probability of contamination of the printed film 13.

[0061] In a preferred embodiment, the outer walls of the rear box shell 10 are covered with a heat insulation layer 18.

[0062] Understandably, the insulation layer 18 can be made of high-efficiency insulation materials such as aluminum silicate fiber, rock wool or polyurethane, which can effectively block the heat radiation and conduction from the high temperature inside the drying oven to the external environment.

[0063] The working principle of this utility model is as follows: When it is necessary to perform molding or cleaning and maintenance, the control cylinder 19 retracts, pulling the rear box 4 backward along the linear slide rail 17, so that it separates from the front box 3. After completing the preparatory work such as molding or cleaning and maintenance, the control cylinder 19 extends, pushing the rear box 4 forward until the end face of the opening of the rear box 4 is tightly pressed against the end face of the opening of the front box 3, forming a closed drying space. Then the printing press and drying system are started. The hot air generated by the external hot air device enters the drying chamber through the upper and lower air inlets 5 through high-temperature resistant hoses. The hot air is effectively evenly distributed as it flows through the guide plate 12 in the inner liner 9 of the rear chamber. Then it is sprayed at high speed and evenly from the nine air nozzles 11 onto the surface of the printed film 13 on the auxiliary guide roller group 14 to heat and dry it. After the hot air releases heat, the temperature drops and it becomes exhaust gas. Under the negative pressure generated by the exhaust fan, this exhaust gas first fills the gap formed between the inner liner 9 of the rear chamber and the outer shell 10 of the rear chamber. Then it enters the exhaust pipe 8 through the opening 7 on the exhaust pipe 8. Finally, it is extracted from the upper and lower air outlets 6 and sent to the exhaust gas recovery and purification device. During the entire operation, the heat insulation layer 18 covering the outer shell 10 of the rear chamber effectively inhibits the heat dissipation of the drying chamber to the external environment, making it more energy-efficient.

[0064] The drying chamber for a gravure printing machine provided by this utility model has the following beneficial effects: The openable front chamber 3 and rear chamber 4, combined with a moving guide mechanism, allow the rear chamber 4 to open and close smoothly with a single button, greatly facilitating daily maintenance such as film threading and guide roller cleaning. By employing upper and lower dual air inlets 5 with an internal guide plate 12, the hot air is evenly distributed within the drying chamber. Combined with precise spraying from multi-point nozzles 11, this solves the problems of uneven airflow and dead zones in traditional drying chambers, ensuring uniform heating of the printed film 13 and stable, reliable drying quality. The gap between the inner liner 9 and the outer shell 10 of the rear chamber, along with two upper and lower air outlet pipes 8, allows for rapid exhaust of waste gas, preventing accumulation and poor ventilation.

[0065] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered as within the scope of this specification. The above embodiments only illustrate specific implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of this utility model, and these all fall within the protection scope of this utility model.

Claims

1. A drying oven for a gravure printing machine, characterized in that, include: A front housing with an opening at one end, the front housing being fixedly mounted on a gravure printing machine; A rear box with an opening at one end, which can be opened and closed to the front box, and together they form a sealed drying space when the front box and the rear box are closed. A moving guide mechanism is installed between the rear box and the gravure printing machine to drive and guide the rear box to move linearly relative to the front box, thereby realizing the docking closure or separation between the front box and the rear box. An auxiliary guide roller assembly is installed inside the front housing to support and guide the printed film as it moves within the drying chamber. An air duct system, located within the rear chamber, is used to dry the printed film inside the drying chamber.

2. The drying oven of a gravure printing machine according to claim 1, characterized in that, The gravure printing machine includes multiple sets of printing mechanisms arranged side by side. Each set of printing mechanisms includes two wall panels, left and right. Each set of printing mechanisms is equipped with a drying box. The front box of the drying box is fixedly installed between the left and right wall panels. The wall panels on the same side of two adjacent sets of printing mechanisms are connected to each other by a crossbeam.

3. The drying oven of a gravure printing machine according to claim 2, characterized in that, The moving guide mechanism includes: A linear slide rail, which is fixedly installed on the crossbeam connecting the adjacent printing mechanism wall panel; A pulley block, wherein the pulley block is mounted on both sides of the rear housing via a mounting bracket and is rotatably fitted onto the linear slide rail; The driving mechanism is a cylinder. The cylinder body is fixed on the crossbeam. The piston rod end of the cylinder is connected to the rear box through a rod end bearing. The piston rod extension and retraction movement drives the rear box to move along the linear slide rail through the pulley group, realizing docking and closing or separation with the front box.

4. A drying oven for a gravure printing machine according to any one of claims 1-3, characterized in that, The air duct system includes an air inlet channel, an air distribution structure, a spray structure, and an exhaust channel disposed on the rear housing; wherein, the air duct system is configured to allow hot air to enter the drying space through the air inlet channel, be evenly distributed by the air distribution structure, and then be guided by the spray structure to print a thin film, and the exhaust gas after heat exchange is discharged through the exhaust channel.

5. The drying oven of a gravure printing machine according to claim 4, characterized in that, The rear box includes a rear box outer shell and a rear box inner liner. The rear box inner liner forms the internal flow channel of the air duct system. The rear box outer shell covers the outside of the rear box inner liner. A gap is formed between the rear box inner liner and the rear box outer shell, and this gap forms part of the exhaust channel.

6. The drying oven of a gravure printing machine according to claim 5, characterized in that, The air inlet channel includes two air inlets respectively located at the upper and lower parts of the rear housing, and the air inlets are connected to an external hot air device through high-temperature resistant hoses.

7. The drying oven of a gravure printing machine according to claim 6, characterized in that, The air distribution structure consists of two sets of flow guide plates installed inside the rear compartment liner and corresponding to the two air inlets. The flow guide plates are used to divide the rear compartment liner cavity into multiple independent flow channels.

8. The drying oven of a gravure printing machine according to claim 5, characterized in that, The blowing structure consists of multiple air nozzles located on the side wall of the rear box inner liner facing the printing film, with the air nozzles of all nozzles pointing directly at the printing film on the surface of the auxiliary guide roller assembly.

9. The drying oven of a gravure printing machine according to claim 5, characterized in that, The exhaust duct also includes two upper and lower exhaust pipes disposed between the rear box outer shell and the rear box inner liner. The exhaust pipes have several openings on their walls to guide the exhaust gas flowing through the gap into the exhaust pipes. The rear box is provided with two upper and lower exhaust ports corresponding to the two exhaust pipes. The exhaust pipes are connected to the exhaust ports to discharge the exhaust gas to an external recycling device.

10. The drying oven of a gravure printing machine according to claim 5, characterized in that, The outer walls of the rear box are covered with a heat insulation layer.

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