Drying device and decorative film printing machine

Abstract

The utility model discloses a kind of drying device and decorative film printing machine, belong to printing device technical field, the drying device includes printing machine rack, guide roller stand, oven, hot air inlet pipe, hot air outlet pipe, heat supply box.The utility model is handled by the hot air exhausted from oven into the activated carbon adsorption tank in heat supply box, using the adsorption of activated carbon can effectively remove volatile organic compounds (VOCs) carried in hot air, so that the drying device adapted with decorative film printing machine has the function of processing volatile organic compounds, avoid hot air recycling when due to volatile organic compounds concentration increase and pollute production environment, harm production personnel health;Meanwhile, after the hot air after activated carbon adsorption processing is sent to heater heating by circulating fan, reenter oven by hot air inlet pipe, realize the recycling of hot air, can reduce heat waste, reach the effect of energy saving and consumption reduction.

Description

Technical Field

[0001] This utility model relates to the field of printing equipment technology, and in particular to a drying device and a decorative film printing machine. Background Technology

[0002] High-strength and high-hardness decorative film is a material that combines decoration and high performance. It can resist daily friction, collision or scratches from sharp objects, and is not easy to scratch or wear. It is especially suitable for high-frequency use scenarios (such as furniture surfaces, electronic product casings, etc.) and can significantly extend the service life of decorative surfaces.

[0003] To enable decorative films to resist everyday friction, impacts, or scratches from sharp objects, existing technologies involve printing surface treatment agents onto the surface of decorative films (such as PVC or polypropylene decorative films) to create a coating with excellent mechanical and electrical properties. Therefore, printing machines are essential equipment in decorative film production. To allow the surface treatment agent to dry and cure, forming a coating, printing machines are generally equipped with drying devices.

[0004] For example, Chinese patent document CN107215091A discloses an environmentally friendly water-based gravure printing drying device, including a fan, heating device, air supply box, air inlet pipe, and air return pipe. This drying device can recycle part of the hot air discharged from the air supply box, thereby achieving energy saving and consumption reduction. However, when printing on the surface of decorative films and other printed materials, volatile organic compounds (VOCs) are generated in the surface treatment agent or ink, causing the hot air to carry VOCs during the drying process. However, the aforementioned drying device does not have the function of treating VOCs, which means that the concentration of VOCs in the hot air increases during the recycling process, not only polluting the production environment but also posing a health hazard to production personnel. Utility Model Content

[0005] The purpose of this invention is to provide a drying device and a decorative film printing machine, which aims to solve the problem that the existing printing machine drying device does not have the function of treating volatile organic compounds (VOCs).

[0006] To achieve the above objectives, the first aspect of this utility model provides a drying device, including a printing press frame, a guide roller frame fixedly connected to the printing press frame, an oven opposite to the guide roller frame, a hot air inlet pipe connected to the hot air inlet of the oven, and a hot air outlet pipe connected to the hot air outlet of the oven; it also includes a heating box fixedly mounted next to the printing press frame; the heating box includes a box body, multiple shelves mounted inside the box body, and an activated carbon adsorption box, a heater, and a circulating fan mounted on the shelves;

[0007] The hot air outlet pipe is connected to a return air branch pipe, which is connected to the input end of the activated carbon adsorption box; the output end of the activated carbon adsorption box is connected to the air inlet end of the circulating fan; the air outlet end of the circulating fan is connected to the air inlet end of the heater; the air outlet end of the heater is connected to the hot air inlet pipe; and the return air branch pipe is connected to a first electric valve.

[0008] Optionally, the drying device further includes a fresh air supply fan; the fresh air supply fan is located at the top of the housing, and the air outlet of the fresh air supply fan is connected to a fresh air delivery pipe; the fresh air delivery pipe is connected to the air inlet of the heater, and the fresh air delivery pipe is connected to a second electric valve.

[0009] Optionally, a temperature sensor is provided on the hot air inlet pipe; the temperature sensor is electrically connected to a controller.

[0010] Optionally, the guide roller frame is fixedly provided with a drive mechanism on both sides in the width direction; the oven is fixedly connected with a roller frame on both sides in the width direction; the output shaft of the drive mechanism is drivenly connected to the roller frame; the printing machine frame is fixedly connected with a guide beam, the length direction of the guide beam is parallel to the width direction of the oven; the roller frame is rotatably mounted on the guide beam.

[0011] Optionally, the roller frame includes a vertically arranged connecting plate and rollers rotatably connected to the connecting plate; the driving mechanism is a pneumatic cylinder or a hydraulic cylinder, and the telescopic rod of the driving mechanism is fixedly connected to the connecting plate.

[0012] Optionally, a rotating rod is provided between the two roller frames; the rotating rod is located outside the oven, and the axial direction of the rotating rod is parallel to the length direction of the oven, and the two ends of the rotating rod pass horizontally through the connecting plate and are connected to the rollers.

[0013] Optionally, both the hot air inlet and the hot air outlet of the oven are connected to flexible air ducts, which are respectively connected to the hot air inlet pipe and the hot air outlet pipe.

[0014] Optionally, a light box is fixedly installed at the bottom of the oven.

[0015] The second aspect of this utility model provides a decorative film printing machine, including the aforementioned drying device, and further including a printing material tank, a printing plate roller rotatably disposed in the printing material tank, and a receiving roller rotatably disposed above the printing plate roller.

[0016] Beneficial effects:

[0017] The first aspect of this utility model provides a drying device that transports hot air discharged from the drying oven to an activated carbon adsorption box inside the heating box for treatment. The activated carbon effectively removes volatile organic compounds (VOCs) carried in the hot air through adsorption, thus enabling the drying device adapted to a decorative film printing machine to handle VOCs. This avoids pollution of the production environment and harm to the health of production personnel caused by increased VOC concentration during hot air recycling. Simultaneously, the hot air treated by activated carbon adsorption is transported to a heater for heating via a circulating fan, and then re-enters the drying oven through a hot air inlet pipe, achieving hot air recycling, reducing heat waste, and achieving energy saving and consumption reduction.

[0018] The second aspect of this utility model also provides a decorative film printing machine, which includes the above-mentioned drying device. The drying device effectively removes volatile organic compounds (VOCs) from the hot air through an activated carbon adsorption box, thereby reducing pollution to the production environment and harm to the health of production personnel during the production of the decorative film printing machine. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a decorative film printing machine equipped with the drying device of this utility model. Figure 1 .

[0020] Figure 2 yes Figure 1 Enlarged view of section A.

[0021] Figure 3 This is a simplified structural diagram of the interior of the heating box.

[0022] Figure 4 This is a schematic diagram of a decorative film printing machine equipped with the drying device of this utility model. Figure 2 .

[0023] Figure 5 yes Figure 4 Enlarged view of section B.

[0024] Figure 6 It refers to the relative positional relationship between the oven and the guide roller frame. Figure 1 .

[0025] Figure 7 It refers to the relative positional relationship between the oven and the guide roller frame. Figure 2 .

[0026] Explanation of icon numbers:

[0027] 1-Printing press frame; 2-Guide roller frame; 3-Oven; 4-Hot air inlet pipe; 5-Hot air outlet pipe;

[0028] 6-Heating box; 601-Box body; 602-Shelves; 603-Activated carbon adsorption box; 604-Heater; 605-Circulating fan; 606-Return air branch pipe;

[0029] 7-First electric valve; 8-Fresh air supply fan; 9-Fresh air delivery pipe; 10-Second electric valve; 11-Temperature sensor; 12-Drive mechanism;

[0030] 13-Roller frame; 131-Connecting plate; 132-Roller;

[0031] 14-Guide beam; 15-Light box; 16-Printing material trough; 17-Printing plate roller; 18-Printing roller; 19-Flexible air duct; 20-Rotating rod. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this utility model are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0034] It should also be noted that when a component is referred to as "fixed to" or "attached to" another component, it can be directly on the other component or may have an intervening component present. When a component is referred to as "connected to" another component, it can be directly connected to the other component or may have an intervening component present.

[0035] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0036] Please see Figures 1 to 7The first aspect of this utility model provides a drying device, which is a component of a decorative film printing machine. Specifically, it includes a printing machine frame 1, a guide roller frame 2 equipped with decorative film guide rollers, an oven 3 opposite to the guide roller frame 2, a hot air inlet pipe 4 connected to the hot air inlet of the oven 3, a hot air outlet pipe 5 connected to the hot air outlet of the oven 3, and a heating box 6 fixedly mounted next to the printing machine frame 1.

[0037] The guide roller frame 2, drying oven 3, hot air inlet pipe 4, and hot air outlet pipe 5 are the basic components of existing gravure printing drying devices. The structure and working principle of the guide roller frame 2 and drying oven 3 can be found in the patent document disclosed in CN107215091A. The heating box 6 includes a box body 601, multiple shelves 602 mounted inside the box body 601, an activated carbon adsorption box 603 mounted on the shelves 602, a heater 604, and a circulating fan 605.

[0038] Specifically, the hot air outlet pipe 5 is used to transport the hot air discharged from the oven 3 into the chamber 601, and the hot air outlet pipe 5 is also connected to a return air branch pipe 606. The return air branch pipe 606 is located inside the chamber 601 and is connected to the input end of the activated carbon adsorption box 603. The output end of the activated carbon adsorption box 603 is connected to the air inlet end of the circulating fan 605; the air outlet end of the circulating fan 605 is connected to the air inlet end of the heater 604; the air outlet end of the heater 604 is connected to the hot air inlet pipe 4; and the return air branch pipe 606 is connected to a first electric valve 7. When the heating box 6 is working, the hot air discharged from the oven 3 is transported into the box body 601 through the hot air outlet pipe 5. A portion of the hot air can enter the activated carbon adsorption box 603 through the return air branch pipe 606. Through the adsorption effect of activated carbon, the volatile organic compounds carried in the hot air are adsorbed and treated. The treated hot air is then transported to the heater 604 by the circulating fan 605 for further heating. Thus, while realizing the recycling of hot air, it can also meet the drying and curing requirements of the surface treatment agent.

[0039] As can be seen, this utility model effectively removes volatile organic compounds (VOCs) carried in the hot air discharged from the oven 3 into the activated carbon adsorption box 603 inside the heating box 6. Utilizing the adsorption properties of activated carbon, the drying device adapted to the decorative film printing machine can effectively remove VOCs from the hot air. This prevents pollution of the production environment and harm to the health of production personnel caused by increased VOC concentration during hot air recycling. Simultaneously, the hot air treated by activated carbon adsorption is transported to the heater 604 by the circulating fan 605 for heating, and then re-enters the oven 3 through the hot air inlet pipe 4, achieving hot air recycling, reducing heat waste, and achieving energy saving and consumption reduction. Furthermore, the first electric valve 7 on the return air branch pipe 606 can control the return air flow rate, facilitating adjustment of the circulating air volume according to actual conditions, ensuring a balance between drying effect and VOCs treatment efficiency. This satisfies the drying and curing requirements of the surface treatment agent while also considering environmental protection, energy saving, and production safety.

[0040] Specifically, the heater 604 is equipped with finned electric heating tubes. The hot air delivered to the housing 601 via the hot air outlet pipe 5 is partly sent to the activated carbon adsorption box 603 for treatment, and the other part can be sent to the rotary valve type regenerative thermal oxidizer outside the workshop for combustion treatment. This ensures that the air that does not participate in the heat cycle will not pollute the atmospheric environment after being discharged into the atmosphere.

[0041] like Figure 1 and Figure 3 As shown, in an optional embodiment, the drying device further includes a fresh air supply fan 8; the fresh air supply fan 8 is located at the top of the housing 601, and the outlet end of the fresh air supply fan 8 is connected to a fresh air delivery pipe 9; the fresh air delivery pipe 9 extends into the housing 601 and is connected to one or more air inlets of the heater 604, and the fresh air delivery pipe 9 is connected to a second electric valve 10. In this embodiment, the fresh air supply fan 8 can introduce fresh air from the outside, allowing the fresh air to be sent to the heater 604 through the fresh air delivery pipe 9 to mix with the processed circulating hot air, thus supplementing the amount of air required for drying, thereby avoiding the drying effect caused by the air in the circulating system becoming monotonous or accumulating humidity due to long-term circulation. Furthermore, the second electric valve 10 can flexibly adjust the amount of fresh air introduced, which helps to reduce the concentration of residual volatile organic compounds in the circulating hot air, improves the overall processing efficiency, and further ensures the safety of the production environment.

[0042] like Figure 3As shown, in an optional embodiment, a temperature sensor 11 is provided on the hot air inlet pipe 4; the temperature sensor 11 is electrically connected to a controller, and the controller is electrically connected to the second electric valve 10 and the first electric valve 7. In this embodiment, the temperature sensor 11 on the hot air inlet pipe 4 can monitor the temperature of the hot air entering the oven 3 in real time and transmit the data to the controller. The controller, through its electrical connection with the second electric valve 10 and the first electric valve 7, can automatically adjust the opening degree of both according to the set temperature: for example, when the hot air temperature is too high, the controller can increase the opening degree of the second electric valve 10 to introduce more fresh air and decrease the opening degree of the first electric valve 7 to reduce the circulating hot air, thereby lowering the hot air temperature; while when the temperature is too low, the controller will adjust in the opposite direction, thereby achieving precise control of the hot air temperature, ensuring the stability and consistency of the drying and curing of the decorative film surface treatment agent, and avoiding the impact of temperature fluctuations on the coating quality.

[0043] Specifically, the temperature sensor 11 can be a PT100 type platinum resistance temperature sensor 11, which has the advantages of high measurement accuracy, good stability and wide applicable temperature range, and can meet the temperature monitoring needs of the drying device.

[0044] like Figures 4 to 6 As shown, in an optional embodiment, the guide roller frame 2 is fixedly provided with driving mechanisms 12 on both sides in the width direction, and the driving mechanisms 12 can be fixedly connected to the printing machine frame 1; the oven 3 is fixedly connected with roller frames 13 on both sides in the width direction; the output shaft of the driving mechanism 12 is drivenly connected to the roller frames 13; the printing machine frame 1 is fixedly connected with a guide beam 14, the length direction of the guide beam 14 is parallel to the width direction of the oven 3; the roller frames 13 are rotatably mounted on the guide beam 14. In this embodiment, the driving mechanisms 12 on both sides of the guide roller frame 2 can drive the roller frames 13 to roll along the guide beam 14, thereby driving the oven 3 to move along its width direction. Therefore, the distance between the oven 3 and the guide roller frame 2 can be increased, providing sufficient operating space and convenience for the upward threading of decorative film in the early stages of production.

[0045] like Figure 5 and Figure 6 As shown, in an optional embodiment, the roller frame 13 includes a vertically arranged connecting plate 131 and rollers 132 rotatably connected to the connecting plate 131; the connecting plate 131 can be fixedly welded to the outer surface of the oven 3. The driving mechanism 12 is a cylinder or a hydraulic cylinder, and the telescopic rod of the driving mechanism 12 is fixedly connected to the connecting plate 131. The cylinder or hydraulic cylinder can provide a stable and controllable driving force. During operation, the telescopic rod can push the connecting plate 131, thereby causing the rollers 132 on the outer side of the connecting plate 131 to roll along the guide beam 14, thereby realizing the adjustment of the position of the oven 3.

[0046] Furthermore, a guide groove is provided on the guide beam 14 along its length, and the roller 132 is rolled within the guide groove. This provides precise guidance and limit for the movement of the roller 132, preventing the roller 132 from deviating from the guide beam 14 during rolling. This ensures that the oven 3 moves stably in the set direction and avoids deviation between the oven 3 and the guide roller frame 2 due to oven 3 offset, which would affect the drying effect or the operation of threading the decorative film. At the same time, the guide groove can constrain the roller 132, enhance the stability of the connection between the roller frame 13 and the guide beam 14, reduce the shaking when the oven 3 moves, and improve the reliability of the oven 3 during use.

[0047] Furthermore, in order to improve the load-bearing capacity of the guide beam 14, a reinforcing plate (not shown in the attached figure) can be installed at the bottom of the guide beam 14 and fixedly connected to the printing machine frame 1.

[0048] like Figures 4 to 6 As shown, in an optional embodiment, a rotating rod 20 is rotatably provided between the two roller frames 13. The rotating rod 20 is located on the outside of the oven 3, and the axial direction of the rotating rod 20 is parallel to the length direction of the oven 3. The two ends of the rotating rod 20 pass horizontally through the connecting plate 131 and are connected to the rollers 132. This enables the rollers 132 on both sides of the oven 3 to rotate synchronously through the rotating rod 20, ensuring that the oven 3 is subjected to balanced forces and moves in a consistent manner on both sides when it moves on the guide beam 14. This avoids the oven 3 tilting or shifting due to asynchronous movement of the rollers 132 on both sides, ensuring the accuracy of the relative position between the oven 3 and the guide roller frame 2. Moreover, the connection structure between the rotating rod 20 and the connecting plate 131 and the rollers 132 can enhance the overall rigidity and stability of the roller frame 13, improve the smoothness and reliability of the oven 3 during movement, and thus ensure the drying effect of the decorative film and the smoothness of the threading operation.

[0049] like Figure 1 and Figure 2 As shown, in an optional embodiment, both the hot air inlet and outlet of the oven 3 are connected to flexible ducts 19. The flexible ducts 19 can be made of PVC and have a telescopic function. The flexible ducts 19 are connected to the hot air inlet pipe 4 and the hot air outlet pipe 5, respectively. In this embodiment, the hot air inlet and outlet of the oven 3 are connected to the hot air inlet pipe 4 and the hot air outlet pipe 5, respectively, via flexible ducts 19. This allows for adaptation to the movement of the oven 3 in the width direction, preventing the ducts from being pulled, broken, or failing to seal due to adjustments in the oven 3's position, ensuring the continuity and sealing of the hot air delivery. Simultaneously, the telescopic characteristics of the flexible ducts 19 make the duct arrangement more flexible, reducing restrictions on the movement of the oven 3 and ensuring that the hot air circulation system can still operate stably when the oven 3's position is adjusted, thus improving the overall adaptability and reliability of the device.

[0050] like Figure 7As shown, in an optional embodiment, a light box 15 is fixedly provided at the bottom of the oven 3. The light box 15 can provide lighting for the area below the oven 3, making it convenient for production personnel to observe the printing status of the decorative film and the usage of surface treatment agents, printing inks, etc. in the printing material tank 16.

[0051] The second aspect of this utility model provides a decorative film printing machine, including the aforementioned drying device, and further including a printing material tank 16, a printing plate roller 17 rotatably disposed within the printing material tank 16, and a receiving roller 18 rotatably disposed above the printing plate roller 17. In this printing machine, the drying device effectively removes volatile organic compounds (VOCs) from the hot air through an activated carbon adsorption box 603, thereby reducing pollution to the production environment and harm to the health of production personnel during the production of the decorative film printing machine.

[0052] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A drying apparatus, comprising a printing press frame (1), a guide roller frame (2) fixedly connected to the printing press frame (1), an oven (3) opposite to the guide roller frame (2), a hot air inlet pipe (4) connected to the hot air inlet of the oven (3), and a hot air outlet pipe (5) connected to the hot air outlet of the oven (3); characterized in that, It also includes a heating box (6) fixedly mounted next to the printing press frame (1); the heating box (6) includes a box body (601), multiple shelves (602) mounted inside the box body (601), and an activated carbon adsorption box (603), a heater (604) and a circulating fan (605) mounted on the shelves (602); The hot air outlet pipe (5) is connected to a return air branch pipe (606), which is connected to the input end of the activated carbon adsorption box (603); the output end of the activated carbon adsorption box (603) is connected to the air inlet end of the circulating fan (605); the air outlet end of the circulating fan (605) is connected to the air inlet end of the heater (604); the air outlet end of the heater (604) is connected to the hot air inlet pipe (4); and the return air branch pipe (606) is connected to a first electric valve (7).

2. The drying apparatus according to claim 1, characterized in that, It also includes a fresh air supply fan (8); the fresh air supply fan (8) is located on the top of the housing (601), and the air outlet of the fresh air supply fan (8) is connected to a fresh air delivery pipe (9); the fresh air delivery pipe (9) is connected to the air inlet of the heater (604), and the fresh air delivery pipe (9) is connected to a second electric valve (10).

3. The drying apparatus according to claim 1, characterized in that, A temperature sensor (11) is provided on the hot air inlet pipe (4); the temperature sensor (11) is electrically connected to a controller.

4. The drying apparatus according to claim 1, characterized in that, The guide roller frame (2) is fixedly provided with a drive mechanism (12) on both sides in the width direction; the oven (3) is fixedly connected with a roller frame (13) on both sides in the width direction; the output shaft of the drive mechanism (12) is connected to the roller frame (13) in a transmission connection; the printing machine frame (1) is fixedly connected with a guide beam (14), the length direction of the guide beam (14) is parallel to the width direction of the oven (3); the roller frame (13) is rolled on the guide beam (14).

5. The drying apparatus according to claim 4, characterized in that, The roller frame (13) includes a vertically arranged connecting plate (131) and a roller (132) rotatably connected to the connecting plate (131); the driving mechanism (12) is a cylinder or a hydraulic cylinder, and the telescopic rod of the driving mechanism (12) is fixedly connected to the connecting plate (131).

6. The drying apparatus according to claim 5, characterized in that, A rotating rod (20) is provided between the two roller frames (13); the rotating rod (20) is located on the outside of the oven (3), and the axial direction of the rotating rod (20) is parallel to the length direction of the oven (3). The two ends of the rotating rod (20) pass horizontally through the connecting plate (131) and are connected to the roller (132).

7. The drying apparatus according to claim 1, characterized in that, The oven (3) is equipped with flexible air ducts (19) for both its hot air inlet and hot air outlet. The flexible air ducts (19) are connected to the hot air inlet pipe (4) and the hot air outlet pipe (5), respectively.

8. The drying apparatus according to claim 1, characterized in that, A light box (15) is fixedly installed at the bottom of the oven (3).

9. A decorative film printing machine, characterized in that, The drying apparatus according to any one of claims 1-8 further includes a printing material tank (16), a printing plate roller (17) rotatably disposed in the printing material tank (16), and a printing roller (18) rotatably disposed above the printing plate roller (17).

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