A rapid drying device for corrugated paper

Abstract

This utility model relates to the field of corrugated paper drying technology, specifically disclosing a rapid corrugated paper drying device, including a drying box. Two drying devices for drying corrugated paperboard are installed on the drying box. A first conveyor belt is installed inside the drying box, located below the two drying devices. A second conveyor belt is installed inside the drying box, located below the first conveyor belt. A turning device for rotating the corrugated paperboard 180° is installed inside the drying box. Two heat recovery devices for recycling excess heat flow are installed on opposite side walls of the inner wall of the drying box, solving the technical problem that existing corrugated paper drying devices can only dry one side of the corrugated paper.

Description

Technical Field

[0001] This utility model relates to the field of corrugated paper drying technology, and specifically discloses a rapid drying device for corrugated paper. Background Technology

[0002] Corrugated paper is a packaging material made of face paper and corrugated core paper bonded together with adhesive. Its core feature is the wavy corrugated structure between the two face papers. This special structure gives corrugated paper excellent compressive strength and cushioning performance, and it is widely used in the transport packaging of various commodities. In the production process, the base paper is first made into wavy corrugations by a corrugated papermaking machine, and then bonded to the face paper by a gluing machine. After that, it enters the drying process. After drying, the corrugated paperboard is trimmed, shaped and other processes to become the finished product, which can be processed into packaging boxes of different specifications as needed.

[0003] Existing drying equipment generally uses a single-layer flat belt conveyor. The corrugated cardboard runs flat on the upper surface of the conveyor belt, and hot air or infrared radiation only passes over it from above. The heat can only penetrate the face paper to reach the upper half of the core paper. The bottom surface of the cardboard is completely covered by the conveyor belt, so it cannot receive convective heat transfer or absorb energy through radiation, forming a "single-sided heating" condition. The lower half of the core paper and the bottom paper are always in a low temperature and high humidity state. The difference in moisture content gradient leads to uneven shrinkage, eventually resulting in defects such as warping and delamination. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a rapid drying device for corrugated paper, so as to solve the technical problem that the existing corrugated paper drying devices can only dry one side of the corrugated paper.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a rapid drying device for corrugated paper, comprising a drying chamber, on which two drying devices for drying corrugated paperboard are installed. A first conveyor belt is provided inside the drying chamber, located below the two drying devices. A second conveyor belt is installed inside the drying chamber, located below the first conveyor belt. A turning device for rotating the corrugated paperboard 180° is installed inside the drying chamber. Two hot air recovery devices for recycling excess hot airflow for secondary use are provided on opposite side walls of the inner wall of the drying chamber.

[0006] In this design, the first conveyor belt located at the top of the drying chamber carries the corrugated cardboard, and two drying devices above it perform the initial drying on the top surface of the cardboard. When the cardboard reaches the end of the first conveyor belt, it is automatically flipped 180° by a flipping device, so that the dried side of the cardboard faces down and the undried side faces up, and it falls smoothly into the second conveyor belt. The second conveyor belt receives the flipped cardboard and continues to transport it. At the same time, the heat recovery devices located on both sides of the drying chamber actively extract the residual heat remaining in the upper part of the drying chamber after the initial drying of the cardboard. The recovered heat is then precisely delivered to the top of the second conveyor belt to perform a secondary drying on the other side of the cardboard on the second conveyor belt. This device not only significantly shortens the drying time through the double-sided drying process, but also achieves the cascade utilization of energy through a high-efficiency heat recovery system, realizing efficient, uniform, and rapid double-sided drying of the corrugated cardboard.

[0007] Furthermore, both of the drying devices include a first fan, a first mounting port is provided on the drying box, a first fan is installed at the first mounting port, a first fixing frame is fixedly installed between two opposite inner sidewalls of the drying box, the first fixing frame is located below the first fan, and a plurality of first heating wires are installed in the first fixing frame.

[0008] In this solution, ambient temperature air is continuously delivered to the first fixed frame by the first fan. The ambient temperature air is heated by the first heating wire to form a stable hot airflow, which directly acts on the corrugated cardboard on the first conveyor belt to achieve a fast and uniform drying effect. This effectively avoids the problems of local overheating or insufficient drying and greatly improves the drying efficiency and quality of the corrugated cardboard.

[0009] Furthermore, the flipping device includes an arc-shaped sliding frame, which is disposed between two opposing inner sidewalls of the drying chamber. The inlet end of the arc-shaped sliding frame is located near the end of the first conveyor belt, and the outlet end of the arc-shaped sliding frame is located near the beginning of the second conveyor belt's travel. An auxiliary moving mechanism for assisting the movement of corrugated cardboard located within the arc-shaped sliding frame is installed inside the drying chamber.

[0010] In this solution, through a precisely designed arc-shaped sliding frame, the corrugated cardboard at the end of the first conveyor belt falls naturally into the entrance end of the arc-shaped sliding frame under the action of gravity. Guided by the involute curved surface of the arc-shaped sliding frame, the corrugated cardboard can automatically flip 180° without any external power or complex clamping mechanism, relying only on its own gravity and the geometric constraints of the slide, and smoothly transition to the second conveyor belt. This greatly simplifies the mechanical structure and reduces manufacturing costs and failure rate.

[0011] Furthermore, the auxiliary moving mechanism includes a second fan, a second mounting port is provided on the drying box, the second fan is installed at the second mounting port, a second fixing frame is installed at the second mounting port, a plurality of second heating wires are provided in the second fixing frame, an air guide frame is fixedly connected below the second fixing frame, an air outlet is provided on the air guide frame, and the air outlet is located on the arc-shaped sliding frame.

[0012] In this solution, the efficient cooperation between the second fan and the second heating wire generates a hot airflow. This airflow is gathered by the lower air guide frame into a hot curtain that fits perfectly with the curved sliding frame, and is precisely blown onto the upper and lower surfaces of the corrugated cardboard. On the one hand, the hot airflow forms an air cushion between the curved surface and the cardboard, reducing friction. On the other hand, the heat carried by the airflow itself can perform secondary enhanced drying of the corrugated cardboard, making up for the defect of drying interruption during the flipping stage in the traditional process and realizing the continuity of the drying process.

[0013] Furthermore, both of the aforementioned hot airflow recovery devices include an L-shaped air supply pipe, which is fixedly connected to the side wall of the drying chamber. The L-shaped air supply pipe is equipped with an airflow recovery mechanism for actively drawing in the hot airflow generated by the drying device.

[0014] In this solution, by precisely integrating the L-shaped air supply duct into the side wall area of ​​the first conveyor belt, and in conjunction with the dynamic recovery mechanism with the built-in cross-flow impeller, excess hot airflow dissipated during the drying process of corrugated cardboard is actively captured. The airflow is then guided through the L-shaped air supply duct to efficiently transport the heat energy to the top of the second conveyor belt for continuous drying of the corrugated cardboard that has already been turned over. This not only significantly reduces the energy consumption of the entire device and improves the efficiency of heat utilization, but also enhances the drying effect on the second side of the corrugated cardboard through the tiered utilization of waste heat. Thus, without adding an additional heat source, the drying process is optimized and the overall production energy efficiency is improved.

[0015] Furthermore, the airflow recovery mechanism includes a first mounting shaft, which is rotatably mounted inside the L-shaped air supply duct. A second mounting shaft is rotatably connected inside the L-shaped air supply duct and extends through to the outside of the L-shaped air supply duct. A cross-flow impeller is fixedly connected between the first mounting shaft and the second mounting shaft. A motor is provided on the outer wall of the L-shaped air supply duct, and the motor power output shaft is fixedly connected to the second mounting shaft.

[0016] In this solution, the motor drives the cross-flow fan to rotate at high speed, forming a continuous and stable transverse negative pressure zone at the L-shaped air supply duct. This precisely captures the high-temperature airflow escaping from the drying device. The cross-flow fan is coaxially supported at both ends by the first and second mounting shafts, ensuring smooth operation without vibration. The high-temperature airflow is guided secondary along the L-shaped air supply duct to the area above the second conveyor belt, where it dries the corrugated cardboard located above the second conveyor belt. The active recovery mechanism significantly improves the thermal energy utilization rate, ensuring that the recovered heat can be concentrated and effectively transported to the required area, achieving precise energy management and recycling.

[0017] The working principle and beneficial effects of this solution are as follows: The first heating wire is activated and the first fan is operated to heat the cold air and blow it onto the corrugated cardboard on the first conveyor belt for surface drying. After the corrugated cardboard reaches the end of the first conveyor belt, it naturally falls into the arc-shaped sliding frame. The arc-shaped sliding frame's involute curved surface design allows for a 180° damage-free flip. At the same time, the second fan precisely delivers the airflow heated by the second heating wire into the sliding frame, which accelerates the drying of the cardboard and ensures precise and smooth flipping. When the flipped corrugated cardboard falls onto the second conveyor belt, the motor on the L-shaped air supply pipe drives the cross-flow fan to rotate. The negative pressure at the air inlet of the L-shaped air supply pipe actively sucks up the excess hot airflow from the first conveyor belt area and precisely delivers it to the top of the second conveyor belt, uniformly drying the bottom surface of the corrugated cardboard. This design, through hot air circulation and precise flipping control, ensures that both sides of the corrugated cardboard are fully heated successively, solving the technical problem that existing corrugated paper drying devices can only dry one side of the corrugated paper.

[0018] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an embodiment; Figure 2 This is a schematic diagram of the drying oven in the embodiment. Figure 3 This is a partial cross-sectional view of an embodiment; Figure 4 This is a schematic diagram of the structure of the first fixing frame and the first heating wire in the embodiment; Figure 5 This is a schematic diagram of the structure of the flipping device in the embodiment; Figure 6 This is a schematic diagram of the structure of the hot airflow recovery device in the embodiment; Figure 7This is a schematic diagram of the airflow recovery mechanism in the embodiment; Figure 8 This is a partial cross-sectional view of the L-shaped air supply duct and baffle in the embodiment.

[0020] The following are the markings in the attached diagram: base plate 1, drying box 2, first conveyor belt 3, second conveyor belt 4, first fan 5, first mounting block 6, first fixing frame 7, first heating wire 8, first mounting port 9, second mounting block 10, arc-shaped sliding frame 11, baffle 12, second fan 13, second fixing frame 14, second heating wire 15, air guide frame 16, second mounting port 17, L-shaped air supply pipe 18, first mounting shaft 19, second mounting shaft 20, cross-flow fan wheel 21, mounting bracket 22, motor 23, partition 24, air outlet 25. Detailed Implementation

[0021] The following detailed description illustrates the specific implementation method: Example

[0022] like Figures 1 to 8 As shown, a rapid drying device for corrugated paper is disclosed, including a base plate 1, a drying chamber 2, two drying devices, a first conveyor belt 3, a second conveyor belt 4, a turning device, and two hot air recovery devices. The drying chamber 2 is fixedly connected to the base plate 1. Two drying devices are installed on the drying chamber 2. The drying devices are used to draw in ambient temperature air, heat it, and dry the corrugated paperboard. The first conveyor belt 3 is arranged inside the drying chamber 2, located below the two drying devices. The starting end of the first conveyor belt 3 is located outside the drying chamber 2, and the end of the first conveyor belt 3 extends into the drying chamber 2. The second conveyor belt 4 is installed on the bottom surface inside the drying chamber 2, located below the first conveyor belt 3. The end of the second conveyor belt 4 extends into the outside of the drying chamber 2. A turning device is arranged on the side wall of the drying chamber 2, located near the end of the first conveyor belt 3. The turning device is used to turn the corrugated paperboard on the first conveyor belt 3 180° and transfer it to the second conveyor belt 4. Two hot air recovery devices are arranged on both sides of the inner wall of the drying chamber 2. The two hot air recovery devices are used to recover and reuse the excess hot air generated after the two drying devices are started.

[0023] like Figure 2 , Figure 3 and Figure 4As shown, both drying devices include a first fan 5, two first mounting blocks 6, a first fixing frame 7, and several first heating wires 8. The drying chamber 2 has a first mounting port 9, and the first fan 5 is installed at the first mounting port 9. The air outlet of the first fan 5 is located inside the drying chamber 2. Two first mounting blocks 6 are installed on the inner wall of the drying chamber 2. The two first mounting blocks 6 are arranged opposite each other. A first fixing frame 7 is installed between the two first mounting blocks 6. The first fixing frame 7 is located below the air outlet of the first fan 5 and above the first conveyor belt 3. Several first heating wires 8 are arranged inside the first fixing frame 7.

[0024] like Figure 5 As shown, the flipping device includes two second mounting blocks 10, an arc-shaped sliding frame 11, a baffle 12, and an auxiliary moving mechanism. Two second mounting blocks 10 are installed on the inner wall of the drying chamber 2. An arc-shaped sliding frame 11 is fixedly connected between the two second mounting blocks 10. The inlet end of the arc-shaped sliding frame 11 is located near the end of the stroke of the first conveyor belt 3, and the outlet end of the arc-shaped frame is located near the beginning of the stroke of the second conveyor belt 4. A baffle 12 is fixedly connected above the arc-shaped sliding frame 11. An auxiliary moving mechanism is installed on the drying chamber 2. The auxiliary moving mechanism is used to assist the movement of the corrugated cardboard located in the arc-shaped sliding frame 11.

[0025] like Figure 5 As shown, the auxiliary moving mechanism includes a second fan 13, a second fixed frame 14, several second heating wires 15, and an air guide frame 16. The drying box 2 has a second mounting port 17, at which the second fan 13 is installed. The second fixed frame 14 is also installed at the second mounting port 17. The second fixed frame 14 is located below the air outlet of the second fan 13. Several second heating wires 15 are arranged inside the second fixed frame 14. The air guide frame 16 is fixedly connected to the lower end of the second fixed frame 14. The air guide frame 16 has an air outlet 25 located above the arc-shaped sliding frame 11.

[0026] like Figure 6 and Figure 8 As shown, both hot airflow recovery devices include an L-shaped air duct 18, a partition 24, and an airflow recovery mechanism. An L-shaped air duct 18 is fixedly connected to the side wall of the drying chamber 2. The air inlet of the L-shaped air duct 18 is located near the side wall of the first conveyor belt 3, and the air outlet of the L-shaped air duct 18 is located above the second conveyor belt 4. A partition 24 is fixedly connected below the L-shaped air duct 18 and is located near the air outlet of the L-shaped air duct 18. An airflow recovery mechanism is provided on the L-shaped air duct 18. The airflow recovery mechanism is used to actively draw the hot airflow generated by the drying device through the L-shaped air duct 18.

[0027] like Figure 7As shown, the airflow recovery mechanism includes a first mounting shaft 19, a second mounting shaft 20, a cross-flow impeller 21, a mounting frame 22, and a motor 23. A rotatable first mounting shaft 19 is installed inside an L-shaped air supply duct 18, and a rotatable second mounting shaft 20 is installed inside the L-shaped air supply duct 18. The second mounting shaft 20 is positioned opposite to the first mounting shaft 19 and extends through to the outside of the L-shaped air supply duct 18. A cross-flow impeller 21 is fixedly connected between the first mounting shaft 19 and the second mounting shaft 20. A mounting frame 22 is fixedly connected to the outer wall of the L-shaped air supply duct 18. A motor 23 is mounted on the mounting frame 22. The power output shaft of the motor 23 is fixedly connected to the second mounting shaft 20. The cross-flow impeller 21 is existing technology.

[0028] In practice When drying corrugated cardboard begins, the first heating wire 8 inside the first fixed frame 7 is first turned on, and then the first fan 5 at the first mounting port 9 is started. The first fan 5 blows cold air from the outside into the first fixed frame 7. The first fixed frame 7 is stably fixed by the two first mounting blocks 6 inside the drying chamber 2. The cold air inside the first fixed frame 7 is heated by the first heating wire 8. The first conveyor belt 3 is started to place the corrugated cardboard to be heated on the starting end of the first conveyor belt 3, and then the first conveyor belt 3 conveys it into the drying chamber 2. At this time, the surface of the corrugated cardboard is gradually dried by the hot airflow heated by the first heating wire 8.

[0029] The first conveyor belt 3 gradually moves the corrugated cardboard towards the entrance end of the curved sliding frame 11. The curved sliding frame 11 is installed inside the drying chamber 2 via two second mounting blocks 10. During this journey, the corrugated cardboard on the first conveyor belt 3 is gradually dried through the cooperation of the first fan 5 and the first heating wire 8. When the corrugated cardboard is conveyed to the end of the first conveyor belt 3, the front end of the corrugated cardboard gradually detaches from the support surface of the first conveyor belt 3 and hangs down naturally. Under the action of gravity and inertia, it accurately enters the entrance of the curved sliding frame 11. The curved sliding frame 11 adopts an involute curved surface design, with a smooth inner wall and a curvature precisely calculated to ensure that the cardboard is only constrained by gravity and the guide surface during the sliding process. The front end of the corrugated cardboard contacts the curved sliding frame 11. After 1, the corrugated cardboard slides in along the arc tangent direction. As it slides down, its center of gravity moves forward, causing it to rotate adaptively around the contact point. When the corrugated cardboard reaches the lowest point of the arc of the arc frame 11, it completes a 90° flip and turns into a vertical state. At this time, as the corrugated cardboard continues to slide along the upward section of the arc frame 11, its rotation trend continues. Finally, the corrugated cardboard completes a 180° flip at the exit end of the arc frame 11, so that the bottom surface of the corrugated cardboard is facing up and the top surface is facing down. After the corrugated cardboard flips 180° through the arc frame 11, it slides onto the second conveyor belt 4. The baffle 12 on the arc frame 11 acts as a shield to prevent the corrugated cardboard located on the first conveyor belt 3 from being conveyed to an area outside the arc frame 11.

[0030] After the corrugated cardboard falls into the curved slide frame 11, the second fan 13 located at the second mounting port 17 is immediately started. The hot airflow heated by the second heating wire 15 in the second fixed frame 14 is continuously and accurately blown into the interior of the curved slide frame 11 through the air outlet 25 opened on the air guide frame 16. This high-temperature airflow can further accelerate the drying of the cardboard surface and form a uniform and stable aerodynamic environment in the slide frame, which helps the corrugated cardboard to complete the 180° flip more smoothly and accurately, and finally make it slide stably onto the second conveyor belt 4.

[0031] After the corrugated cardboard flips 180° and slides onto the second conveyor belt 4, the second conveyor belt 4 moves the corrugated cardboard. During this process, the motor 23, which is installed on the L-shaped air duct 18 on the side wall of the drying chamber 2, starts synchronously. The motor 23 is stably fixed to the side wall of the L-shaped air duct 18 by the mounting bracket 22. The motor 23 drives the second mounting shaft 20 to rotate, and the second mounting shaft 20 drives the cross-flow fan 21 to start rotating through the first mounting shaft 19. When the cross-flow fan 21 starts to rotate, since the L-shaped air duct 18 is located on the side wall of the first conveyor belt 3, the cross-flow fan 21 forms a negative pressure through the air inlet end of the L-shaped air duct 18 during rotation, actively drawing in the hot airflow generated by the first fan 5 and the first heating wire 8. The airflow is guided by the L-shaped air supply duct 18 and finally delivered at high speed from the air outlet of the L-shaped air supply duct 18, precisely transported to the area above the second conveyor belt 4. At this time, the baffle 24 located at the air outlet of the L-shaped air supply duct 18 constrains and directs the hot airflow to the area above the second conveyor belt 4, preventing the hot airflow from spreading and ensuring that the corrugated cardboard on the second conveyor belt 4 can be fully heated, achieving continuous drying of the corrugated cardboard. The 180° rotation completed by the arc-shaped sliding frame 11 allows both sides of the corrugated cardboard to be fully heated in turn, thereby achieving efficient and uniform double-sided drying of the corrugated cardboard. The corrugated cardboard is gradually carried out of the drying chamber 2 by the second conveyor belt 4, at which point the rapid double-sided drying process of the corrugated cardboard is completed.

[0032] The above description is merely an embodiment of this utility model, and common knowledge such as specific structures and characteristics in the solution is not described in detail here. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model, and these should also be considered within the protection scope of this utility model. These modifications and improvements will not affect the effectiveness of the implementation of this utility model or its practicality.

Claims

1. A corrugated paper rapid drying device, characterized by: The device includes a drying chamber with two drying devices installed on it for drying corrugated cardboard. A first conveyor belt is installed inside the drying chamber, located below the two drying devices. A second conveyor belt is installed inside the drying chamber, located below the first conveyor belt. A turning device is installed inside the drying chamber to rotate the corrugated cardboard 180°. Two heat recovery devices are installed on opposite sides of the inner wall of the drying chamber to recover and reuse excess heat.

2. The corrugated paper rapid drying device according to claim 1, characterized in that: Both of the drying devices include a first fan, a first mounting port is provided on the drying box, a first fan is installed at the first mounting port, a first fixing frame is fixedly installed between two opposite inner sidewalls of the drying box, the first fixing frame is located below the first fan, and a plurality of first heating wires are installed in the first fixing frame.

3. The corrugated paper rapid drying device according to claim 1, characterized in that: The flipping device includes an arc-shaped sliding frame, which is disposed between two opposite inner sidewalls of the drying chamber. The inlet end of the arc-shaped sliding frame is located near the end of the first conveyor belt, and the outlet end of the arc-shaped sliding frame is located near the beginning of the second conveyor belt's travel. An auxiliary moving mechanism is installed inside the drying chamber to assist the movement of corrugated cardboard located within the arc-shaped sliding frame.

4. The corrugated paper rapid drying device according to claim 3, characterized in that: The auxiliary moving mechanism includes a second fan, a second mounting port is provided on the drying box, the second fan is installed at the second mounting port, a second fixing frame is installed at the second mounting port, a plurality of second heating wires are provided in the second fixing frame, an air guide frame is fixedly connected below the second fixing frame, an air outlet is provided on the air guide frame, and the air outlet is located on the arc-shaped sliding frame.

5. The corrugated paper rapid drying device according to claim 1, characterized in that: Both of the aforementioned hot airflow recovery devices include an L-shaped air supply pipe, which is fixedly connected to the side wall of the drying chamber. The L-shaped air supply pipe is equipped with an airflow recovery mechanism for actively drawing in the hot airflow generated by the drying device.

6. The corrugated paper rapid drying device according to claim 5, characterized in that: The airflow recovery mechanism includes a first mounting shaft, which is rotatably mounted inside the L-shaped air supply duct. A second mounting shaft is rotatably connected inside the L-shaped air supply duct and extends through to the outside of the L-shaped air supply duct. A cross-flow impeller is fixedly connected between the first mounting shaft and the second mounting shaft. A motor is provided on the outer wall of the L-shaped air supply duct, and the motor power output shaft is fixedly connected to the second mounting shaft.

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