Circulating printing oven

Abstract

The utility model discloses a circulating printing oven, which relates to the technical field of printing equipment and comprises an oven cover and an oven body, one side of the oven cover is rotatably connected with one side of the oven body, the other side of the oven cover is movably connected with the other side of the oven body through an opening and closing air cylinder, and a plurality of air blowing ports which are uniformly distributed along the length of the whole cover body are arranged in the oven cover. The side edge of the drying oven body is provided with an opening allowing printed matter to pass through, the air blowing opening is connected to a heat collection box through an air inlet pipe, the heat collection box is connected to a centrifugal fan, the centrifugal fan is connected to a circulating air pipe, and the circulating air pipe is a three-way pipe and is connected to the space in the drying oven body and external air. And a waste discharge port is formed in the oven cover. The circulating printing drying oven is even and efficient in drying, the adjusting performance is improved, the circulating printing drying oven is provided with a heat energy circulating and heat recycling structure, heat loss is small, waste can be discharged, and accumulation of water vapor and toxic waste gas is avoided.

Description

Technical Field

[0001] This utility model relates to the field of printing equipment technology, specifically to a circulating printing oven. Background Technology

[0002] Current drying equipment for printing presses suffers from the following technical defects: During the drying process, uneven heat distribution easily leads to localized temperature differences on the surface of printed materials, causing differential shrinkage of the substrate and resulting in wrinkles; existing drying equipment can only adjust temperature and airflow to control the drying power, but this adjustment is delayed, and the temperature drop at the air outlet is not immediate; water vapor accumulated inside the sealed drying oven cannot be effectively discharged, creating a heat and moisture circulation stagnation effect, significantly reducing heat utilization efficiency and prolonging the drying cycle; volatile organic compounds (VOCs) such as benzene and esters contained in ink solvents are accelerated to escape under high-temperature conditions, producing toxic waste gases with irritating odors, causing dual pollution to the workshop environment and the atmospheric ecology; due to structural problems, much heat is ineffectively dissipated in existing equipment, resulting in low thermal efficiency and further increasing unit energy consumption costs. These technical bottlenecks severely restrict the finished product qualification rate, production energy consumption costs, and environmental compliance of enterprises. Utility Model Content

[0003] Technical problem to be solved by the utility model

[0004] The technical problem to be solved by this utility model is to provide a circulating printing oven that dries evenly and efficiently, improves its adjustable performance, has a heat energy circulation and heat recovery structure, has low heat loss, and can discharge waste to avoid the accumulation of water vapor and toxic waste gas.

[0005] Technical solution

[0006] To solve the above problems, the technical solution provided by this utility model is as follows:

[0007] A circulating printing oven includes an oven cover and an oven body that are rotatably connected on one side. The oven cover and the oven body are movably connected on the other side by an opening and closing cylinder. The oven cover has a plurality of air vents that are evenly distributed along the overall length of the cover. The side of the oven body has an opening for the passage of printed matter. The air vents are connected to a heat collection box through an air inlet pipe. The heat collection box is connected to a centrifugal fan. The centrifugal fan is connected to a circulating air duct. The circulating air duct is a T-shaped pipe that is connected to the space inside the oven body and the outside air respectively. The oven cover has a waste discharge port.

[0008] The rotating oven lid and opening / closing cylinder allow the operator to easily open and close the oven, facilitating the loading and unloading of printed materials to be dried. Simultaneously, it ensures the airtightness of the oven's internal environment during the drying process, helping to maintain stable drying conditions. Furthermore, the partially open cylinder allows control of the distance between the air vents and the printed materials, efficiently and instantly controlling the temperature and force of the hot air blown onto the materials. Air vents evenly distributed along the length of the oven lid ensure uniform distribution of hot air on the surface of the printed materials to be dried, thus avoiding localized overheating or underheating, reducing problems such as substrate deformation and wrinkling caused by temperature differences, and improving the quality of the finished product. A heat collection box centrally collects heat, while a centrifugal fan forces airflow, delivering heated air into the oven through the air vents. This design not only improves the efficiency of heat energy utilization but also allows for faster adjustment of the drying temperature, overcoming the adjustment delay problem in traditional equipment. A three-way circulating air duct connects the oven's internal space to the outside air, enabling the recirculation of hot air and effectively reducing energy loss. In addition, fresh air from outside is introduced as needed to regulate internal humidity and temperature, further optimizing the drying environment. The exhaust vent can effectively remove water vapor accumulated inside the oven as well as toxic waste gases (such as benzene, esters, and other VOCs) generated by the evaporation of ink solvents. This not only improves the working environment and reduces harm to human health, but also reduces pollution to the external atmosphere.

[0009] Optionally, a guide shaft is provided next to the opening and closing cylinder, and the guide shaft is connected to the oven cover and the oven body.

[0010] The guide shaft ensures that the oven lid moves along a preset path during opening and closing, avoiding shaking or misalignment that may be caused by cylinder movement, making operation smoother and more reliable. The guide shaft also ensures precise positioning between the oven lid and the oven body, guaranteeing a good seal between them, which is crucial for maintaining a stable drying environment (such as temperature and humidity).

[0011] Optionally, the air outlet, the air inlet pipe, the heat collection box, the centrifugal fan, and the circulating air duct are each provided in two sets and are symmetrically and evenly distributed.

[0012] By incorporating two sets of symmetrically and evenly distributed air vents inside the oven lid, hot air can be more evenly distributed across the entire surface of the printed material, effectively preventing localized overheating or underheating. This reduces issues such as substrate deformation and wrinkling caused by temperature differences, further improving the quality of the finished product. The dual-set design means that even if one set of equipment fails, the other can continue operating. This not only improves the system's reliability and stability but also reduces production interruptions due to equipment failure, helping to maintain production continuity.

[0013] Optionally, the circulating air duct connected to the outside air is equipped with a control valve structure.

[0014] Control valves allow operators to precisely adjust the amount of outside air entering the drying oven system as needed. This helps maintain ideal drying conditions, such as temperature and humidity, thereby ensuring print quality. By flexibly adjusting the inflow of outside air, heat energy usage can be managed more effectively, avoiding unnecessary energy waste. For example, reducing the introduction of fresh air when full power is not required can help save on heating costs. Different production environments or requirements may necessitate different drying conditions. Control valves enable the system to be quickly adjusted according to actual conditions, enhancing the equipment's adaptability to various operating conditions.

[0015] Optionally, the connection between the heat collection box and the centrifugal fan is provided with a diverging air diffuser, and the connection is provided with a planar partition.

[0016] The diffuser-shaped air vents allow heated air to be distributed more evenly throughout the oven. Compared to direct jetting, diffusers allow hot air to enter the oven in a more dispersed manner, thus avoiding localized overheating or uneven temperature distribution and ensuring more uniform heating of the printed surface. By optimizing the flow path of hot air, the diffuser design helps reduce energy loss. The presence of baffles allows hot air to mix better as it passes through the ducts, achieving a more stable temperature distribution and improving overall thermal efficiency. The diffuser design and the diffuser-shaped baffles on the plane also help reduce noise generated by airflow. This is because they change the direction and speed of the airflow, reducing the likelihood of high-speed airflow directly impacting the surface of the object, thereby reducing noise generation.

[0017] Optionally, the diffuser outlet faces the heating tube of the heat collector box, and the other end of the heat collector box is provided with a hot air outlet and connected to the air inlet pipe.

[0018] The diffuser vents and the radiating baffles on the flat surface work together to ensure that the air is optimally dispersed after entering the collector box, making full contact with the heating elements. This not only promotes effective heat absorption but also avoids localized overheating or cold spots caused by uneven airflow.

[0019] Optionally, the sidewall of the air outlet is an inclined wall, and the opening of the air outlet is a constriction slit.

[0020] The constriction design increases the airflow velocity through the air outlet. According to Bernoulli's principle, when gas passes through a narrow space, its velocity increases while its pressure decreases. This helps to direct hot air more concentratedly to the printed surface, improving localized heating efficiency. The sloping wall design guides air into a more directional and concentrated airflow pattern, reducing airflow dispersion and turbulence. This ensures that hot air covers the printed material to be dried more evenly, reducing inconsistent drying problems caused by uneven airflow. Because the airflow is more concentrated and faster, heat can be transferred to the printed surface more effectively, reducing energy loss. At the same time, this design also helps to better control drying temperature and time, further improving energy efficiency. Traditional straight-wall air outlets may cause overheating or underheating of edge areas. The sloping wall combined with the constriction design effectively alleviates this phenomenon, allowing the entire printed surface to receive uniform heating treatment and avoiding quality problems at the edges.

[0021] Optionally, the air outlet may have several partition layers that vertically divide the space, with the partition layers closer to the air inlet pipe being shorter.

[0022] Through a layered design, the airflow entering the blower can be distributed and guided in a predetermined manner. The lower partition layer, located closer to the air inlet duct, helps direct more airflow towards the central or outer areas of the blower, resulting in a more uniform airflow distribution. This avoids uneven drying caused by airflow concentrating in one area. This design ensures that hot air is distributed more evenly along the entire length of the blower, rather than concentrating at specific points or areas. Therefore, it improves the consistency of heat received across the entire printed surface, reducing localized overheating or underheating, thereby improving finished product quality.

[0023] Optionally, the separator layer is inclined toward the air inlet duct.

[0024] The sloping partition layer can more effectively guide the direction of airflow, allowing hot air entering from the air inlet to flow more smoothly along a predetermined path to the outlet of the air blower. This design helps reduce turbulence and resistance of air inside the air blower, making the airflow more stable and orderly.

[0025] Optionally, the exhaust port is connected to the oven cover via an exhaust transition air body, which is a cuboid and narrows at the exhaust port via an inclined shell.

[0026] This design helps guide exhaust gases more smoothly from inside the oven to the exhaust port. The inclined structure reduces airflow resistance, making exhaust gas discharge more efficient and preventing exhaust gases from accumulating or forming turbulence in the exhaust transition air body. The reduced diameter design at the exhaust port accelerates the flow rate of the exhaust gases, which helps to remove harmful gases more effectively, reducing their residence time in the oven and thus minimizing their impact on product quality.

[0027] Beneficial effects

[0028] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0029] The technical solution provided by this utility model has air outlets evenly distributed along the length of the overall cover, which has uniform and efficient drying performance. It adopts a design that combines centrifugal fan with heat collection box and circulating air duct, which improves the performance of real-time adjustment. It also has a circulating air duct that can recycle some hot air, which has a heat energy circulation and heat recovery structure. It is equipped with a dedicated exhaust port for effective exhaust gas and water vapor discharge. By optimizing the equipment structure, heat loss is reduced. Attached Figure Description

[0030] Figure 1 A schematic diagram of the structure of a circulating printing oven proposed for an embodiment of this utility model (view 1);

[0031] Figure 2 A second perspective view of the structure of a circulating printing oven proposed as an embodiment of this utility model;

[0032] Figure 3 A schematic diagram of the bottom structure of the oven lid of a circulating printing oven, as proposed in an embodiment of this utility model;

[0033] Figure 4 A cross-sectional schematic diagram of a circulating printing oven provided as an embodiment of this utility model;

[0034] Figure 5 A cross-sectional schematic diagram of the air outlet of a circulating printing oven, as proposed in an embodiment of this utility model;

[0035] Figure 6 A cross-sectional schematic diagram of a centrifugal fan and a heat collection box for a circulating printing oven, as proposed in an embodiment of this utility model;

[0036] Figure 7 A schematic diagram of the circulating air duct of a circulating printing oven, as proposed in an embodiment of this utility model;

[0037] 1. Oven lid; 2. Oven body; 3. Baffle plate; 4. Opening / closing cylinder; 5. Guide slide shaft; 6. First centrifugal fan; 601. Diffuser; 7. First heat collector box; 701. First hot air outlet; 702. Heating tube; 8. Second centrifugal fan; 9. Second heat collector box; 901. Second hot air outlet; 10. First circulating air duct; 11. Second circulating air duct; 12. First set of air inlet ducts; 13. Second set of air inlet ducts; 14. Waste outlet; 15. Hinge; 16. Air blower; 1601. Sloping wall; 1602. Contraction joint; 17. First partition layer; 18. Second partition layer; 19. Third partition layer; 20. Air damper; 21. Handwheel damper actuator; 22. Pin shaft; 23. Waste discharge transition air body. Detailed Implementation

[0038] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments.

[0039] Example

[0040] Combined with appendix Figure 1 A circulating printing oven includes an oven cover 1 and an oven body 2 rotatably connected on one side. The oven cover 1 and oven body 2 are cuboid in shape, and a hinge 15 is provided at the rotatable connection. The hinge 15 plate is fixed to the sides of the oven cover 1 and oven body 2 respectively by screws. Two other sides of the oven body 2 are provided with baffles 3, each with an opening in the middle for the passage of printed materials. The oven cover 1 and oven body 2 are made of stainless steel or aluminum alloy to ensure structural strength and corrosion resistance. The outer wall of the oven body / cover is 1.5mm thick, made of 304 stainless steel, and lined with 0.8mm high-temperature resistant aluminized steel plate (temperature resistance ≥300℃). The hinge 15 plate is fixed to the oven cover 1 and oven body 2 using high-strength stainless steel screws to ensure long-term stability. The hinge 15 plate is made of 10mm thick Q235 steel plate and is fixed with M8 stainless steel countersunk screws.

[0041] Combined with appendix Figure 2 The oven lid 1 and the oven body 2 are movably connected on the other side by an opening and closing cylinder 4. Two symmetrical opening and closing cylinders 4 are provided. The output end of the opening and closing cylinder 4 is hinged to the side of the oven body 2, and the piston end of the opening and closing cylinder 4 is hinged to the oven lid 1. A guide shaft 5 is provided next to the opening and closing cylinder 4, connecting the oven lid 1 and the oven body 2. In this embodiment, only one guide shaft 5 is provided, located in the middle of the opening and closing cylinder 4. One end of the guide shaft 5 is hinged to the side of the oven body 2, and the guide shaft 5 is slidably connected to a sliding sleeve, which is hinged to the side of the oven body 2. The guide shaft 5 is a solid steel shaft with a diameter of approximately 30mm, and its surface is hardened. The inner diameter of the sliding sleeve is slightly larger than the shaft diameter to reduce friction and ensure smooth movement.

[0042] Combined with appendix Figure 3The oven lid 1 has several air vents 16 evenly distributed along the overall length of the lid. In this embodiment, there are eight air vents 16 evenly distributed inside the oven lid 1. The length of each air vent 16 is greater than 80% of the length of the oven lid 1 to ensure the uniformity of hot air blowing. Air vent 16 parameters: length of a single air vent 16 is 1600mm (covering 180% of the length of the oven lid), and width is 20mm.

[0043] Combined with appendix Figure 1-2 The side of the oven body 2 is provided with an opening for the printing materials to pass through. The air outlet 16 is connected to the heat collection box through an air inlet pipe. The air inlet pipe is a bent pipe with a bending angle of 180° and is connected to the hot air outlet.

[0044] The heat collection box is connected to a centrifugal fan, which is connected to a circulating air duct. The circulating air duct is a T-junction connected to both the space inside the oven body 2 and the outside air. A waste outlet 14 is provided on the oven cover 1. Two sets of air inlets 16, air inlets, heat collection boxes, centrifugal fans, and circulating air ducts are provided and symmetrically and evenly distributed. A diffuser 601 faces the heating element 702 of the heat collection box. A hot air outlet is provided at the other end of the heat collection box and connected to the air inlet.

[0045] In this embodiment, the air inlets 16 are provided in two sets, with four in each set, respectively connected to the first set of air inlet pipes 12 and the second set of air inlet pipes 13. The first set of air inlet pipes 12 and the second set of air inlet pipes 13 each have four pipes, arranged side-by-side at one end of the top of the oven cover 1. The first set of air inlet pipes 12 is connected to the first heat collection box 7 via the first hot air outlet 701, and the second set of air inlet pipes 13 is connected to the second heat collection box 9 via the second hot air outlet 901. The first heat collection box 7 is connected to the first centrifugal fan 6, and the second heat collection box 9 is connected to the second centrifugal fan 8. The first heat collection box 7, the first centrifugal fan 6, the second heat collection box 9, and the second centrifugal fan 8 are respectively located on both sides of the top of the oven cover 1. The first centrifugal fan 6 is connected to the first circulating air duct 10, and the second centrifugal fan 8 is connected to the second circulating air duct 11. The first circulating air duct 10 is located on the oven cover 1 at the end of the opening / closing cylinder 4, and the second circulating air duct 11 is located on the oven cover 1 at the end of the air inlet pipe. The centrifugal fan can extract hot air from the oven lid 1 and oven body 2, and can also extract air from the outside.

[0046] Air inlet duct: 150mm diameter, 180° bend (bending radius 200mm), flange connection (M10×25 bolts, 100mm spacing).

[0047] Combined with appendix Figure 4 The sidewall of the air outlet 16 is a sloping wall 1601, and the opening of the air outlet 16 is a contraction slit 1602. The width of the contraction slit 1602 at the opening is 5mm (the inclination angle of the sloping wall 1601 is 30°).

[0048] Combined with appendix Figure 5The air outlet 16 has several vertically divided partitions inside, with the partitions closer to the air inlet duct being shorter. The partitions slope towards the air inlet duct. The internal partitions are vertical stainless steel partitions with decreasing height gradients (highest layer 100mm, lowest layer 20mm), and slope towards the air inlet duct at a 15° angle. The partitions include a first partition 17, a second partition 18, and a third partition 19, with their lengths increasing sequentially.

[0049] Combined with appendix Figure 6 The connection between the solar collector and the centrifugal fan is equipped with a diverging air diffuser 601, and the connection contains a planar, diverging baffle. The baffle has two layers and is bent. Solar collector: dimensions 600×400×300mm, with 6 sets of U-shaped electric heating tubes (each tube has a power of 4kW, total power 24kW). Diffuser 601: diverging airflow guide baffle (2 layers, 60° bend, 50mm spacing), made of 310S stainless steel.

[0050] Combined with appendix Figure 7 The circulating air duct, connecting to the outside air, is equipped with a control valve structure. The control valve structure consists of a damper 20 and a handwheel damper actuator 21. The damper 20 is circular and located inside the duct. The damper 20 is fixed to a pin 22 by screws in the middle. The pin 22 is connected to the output end of the handwheel damper actuator 21. Operating the handwheel damper actuator 21 allows adjustment of the damper 20's angle. The three-way circulating air duct has a main pipe diameter of 200mm, branch pipe diameters of 150mm, a wall thickness of 1.2mm, and flange connections.

[0051] The exhaust port 14 is connected to the oven cover 1 via an exhaust transition air body 23. The exhaust transition air body 23 is a cuboid and its diameter is reduced at the exhaust port 14 by an inclined shell. The exhaust port 14 is connected to another centrifugal fan, which has high exhaust efficiency. The exhaust air velocity is ≥8m / s due to the negative pressure suction of the centrifugal fan.

[0052] Working principle:

[0053] Operating state 1: With the damper 20 closed, the interior of the oven cover 1 and oven body 2 is circulated by a centrifugal fan, heat collector, air inlet pipe and air outlet 16 to minimize heat loss, and is used for short-term, energy-saving and pollution-free drying of printed materials.

[0054] Working state two: The damper 20 is open or half-open, introducing outside air during the circulation process, and discharging waste while drying printed materials. It is used for drying printed materials that will generate pollution and waste gas.

[0055] Highly efficient and uniform heating: 16+ air outlets with layered airflow design, temperature difference ≤ ±3℃.

[0056] Energy-saving circulation: More than 70% of hot air is recirculated internally, reducing energy consumption by 20%-30%.

[0057] Flexible control: The combination of manual air valve and automatic temperature control is suitable for different printing processes (such as UV curing and water-based ink drying).

[0058] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A circulating printing oven, characterized in that, The oven includes an oven cover and an oven body that are rotatably connected on one side. The other side of the oven cover and the oven body are movably connected by an opening and closing cylinder. The oven cover has several air vents that are evenly distributed along the overall length of the cover. The side of the oven body has an opening for printing materials to pass through. The air vents are connected to a heat collection box through an air inlet pipe. The heat collection box is connected to a centrifugal fan. The centrifugal fan is connected to a circulating air duct. The circulating air duct is a three-way pipe that is connected to the space inside the oven body and the outside air respectively. The oven cover has a waste discharge port.

2. The circulating printing oven according to claim 1, characterized in that, A guide shaft is provided next to the opening and closing cylinder, and the guide shaft is connected to the oven cover and the oven body.

3. The circulating printing oven according to claim 1, characterized in that, The air outlet, the air inlet pipe, the heat collection box, the centrifugal fan, and the circulating air duct are all provided in two sets and are symmetrically and evenly distributed.

4. A circulating printing oven according to claim 3, characterized in that, The circulating air duct is equipped with a control valve structure inside the duct that connects to the outside air.

5. A circulating printing oven according to claim 3, characterized in that, The connection between the heat collection box and the centrifugal fan is provided with a diverging air diffuser, and the connection is provided with a planar partition.

6. A circulating printing oven according to claim 5, characterized in that, The diffuser outlet faces the heating tube of the heat collector box, and the other end of the heat collector box is provided with a hot air outlet and connected to the air inlet pipe.

7. A circulating printing oven according to claim 1, characterized in that, The sidewall of the air outlet is an inclined wall, and the opening of the air outlet is a contraction slit.

8. A circulating printing oven according to claim 7, characterized in that, The air outlet has several partition layers that vertically divide the space, with the partition layers closer to the air inlet pipe being shorter.

9. A circulating printing oven according to claim 8, characterized in that, The separator layer is inclined toward the air inlet duct.

10. A circulating printing oven according to claim 1, characterized in that, The waste outlet is connected to the oven cover via a waste discharge transition air body, which is a cuboid and narrows at the waste outlet via an inclined shell.

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