Drying device for packaging machine

Abstract

The utility model relates to the technical field of packaging production equipment, and discloses a drying device for a packaging machine, the drying device comprises a drying box body and a conveying belt, the conveying belt penetrates through the drying box body and is used for sequentially conveying packaging boxes to pass through the drying box body, a heating device and a hot air circulating device are arranged in the drying box body, and the heating device comprises a plurality of heating lamps; the multiple heating lamps are distributed in the length direction of the drying box body and installed on the inner top of the drying box body, the hot air circulation device comprises a fan, an exhaust pipe and an air supply pipe, and the exhaust pipe and the air supply pipe are both arranged in parallel to the length direction of the drying box body and both communicate with the interior of the drying box body through a plurality of short connecting pipes. The exhaust pipe is located above the air supply pipe, the draught fan is located between the exhaust pipe and the air supply pipe and arranged on the outer side wall of the drying box body, the air inlet end of the draught fan communicates with the exhaust pipe, and the air outlet end of the draught fan communicates with the air supply pipe. The device has the effect of improving the output quality and the production efficiency of the packaging boxes.

Description

Technical Field

[0001] This application relates to the field of packaging production equipment technology, and in particular to a drying device for packaging machines. Background Technology

[0002] In the packaging industry, the production process of packaging boxes typically involves multiple steps such as printing, lamination, and gluing. After these steps are completed, a certain amount of moisture often remains on the surface of the packaging box, such as moisture from the printing ink, lamination adhesive, and the adhesive used during gluing. If the packaging boxes are not dried in time, the residual moisture can lead to problems such as deformation, mold, and sticking, seriously affecting the quality and appearance of the packaging boxes.

[0003] Currently, some packaging machines are equipped with simple drying devices, but these have many shortcomings. On the one hand, traditional drying devices have low drying efficiency and cannot meet the demands of high-speed modern packaging production. For example, natural air drying is not only time-consuming but also greatly affected by environmental temperature and humidity, making it difficult to guarantee consistent drying results. On the other hand, some drying devices produce uneven drying, easily causing some packaging boxes to be over-dried while others are under-dried. For instance, some devices using hot air drying suffer from uneven hot air distribution, leading to uneven heating of the packaging boxes during the drying process, resulting in problems such as deformation and color differences. Furthermore, traditional drying devices also have significant energy efficiency issues, consuming a lot of energy and increasing production costs.

[0004] Overall, both natural air drying and traditional hot air drying methods suffer from drawbacks such as low drying efficiency and high energy consumption to varying degrees. Furthermore, in today's high-speed packaging production lines, these technologies struggle to simultaneously meet the requirements of rapid response and uniform drying, thus posing a potential threat to the quality of the packaged products. Utility Model Content

[0005] In order to improve the output quality and production efficiency of packaging boxes, this application provides a drying device for packaging machines.

[0006] The drying device for a packaging machine provided in this application adopts the following technical solution:

[0007] A drying device for a packaging machine includes a drying chamber and a conveyor belt. The conveyor belt passes through the drying chamber and is used to sequentially transport packaging boxes through the drying chamber. A heating device and a hot air circulation device are installed inside the drying chamber. The heating device includes a plurality of heating lamps distributed along the length of the drying chamber and installed on the inner top of the drying chamber. The hot air circulation device includes a fan, an exhaust pipe, and an air supply pipe. Both the exhaust pipe and the air supply pipe are arranged parallel to the length of the drying chamber and are connected to the interior of the drying chamber through a plurality of connecting short pipes. The exhaust pipe is located above the air supply pipe. The fan is located between the exhaust pipe and the air supply pipe and is installed on the outer wall of the drying chamber. The air inlet of the fan is connected to the exhaust pipe, and the air outlet is connected to the air supply pipe.

[0008] By adopting the above technical solution, the drying device can achieve efficient heat recycling. The heat generated by the heating lamps is drawn in by the fan and evenly distributed inside the drying chamber through the air supply duct, ensuring that the moisture on the surface of the packaging boxes evaporates quickly. At the same time, the exhaust duct extracts the hot and humid air from the drying chamber, forming a continuous hot air circulation, effectively reducing the generation of localized overheating or cold zones, and improving the uniformity and efficiency of drying. This design not only significantly reduces energy consumption but also improves the adaptability to environmental factors during the production process and enhances the quality stability of the finished packaging boxes.

[0009] Optionally, the heating device further includes a set of reflectors, with a set of reflectors at each of the inner corners of the drying chamber, and each set of reflectors is inclined toward the center of the drying chamber, and each set of reflectors is distributed along the length of the drying chamber.

[0010] By adopting the above technical solution, the reflectors tilted at the inner corners of the drying chamber can redirect some of the upward-scattered heat emitted by the heating lamps back to the surface of the packaging box, effectively improving heat utilization and enhancing the drying effect. Simultaneously, multiple sets of reflectors distributed along the length of the drying chamber further improve the uniform coverage of heat throughout the drying area, reducing the occurrence of localized over- or under-drying caused by uneven heat distribution, thereby significantly improving drying efficiency and the drying quality of the packaging boxes.

[0011] Optionally, a controller is fixedly installed on the outer wall of the drying chamber, and the fan and heating lamp are both electrically connected to the controller. A humidity sensor electrically connected to the controller is installed inside the drying chamber.

[0012] By adopting the above technical solution, the controller can automatically adjust the fan speed and heating power of the heating lamp according to the actual humidity value detected by the humidity sensor, so as to regulate the humidity in the drying chamber within a suitable range, thereby improving drying efficiency and reducing the possibility of packaging boxes being damaged due to excessive drying or excessive humidity.

[0013] Optionally, the drying chamber is provided with a guiding mechanism, which includes a guide plate disposed at the feed end of the drying chamber. One guide plate is disposed on each side along the conveying direction of the conveyor belt, and the distance between the two guide plates gradually decreases in the direction away from the drying chamber.

[0014] By adopting the above technical solution, the guide plate design allows the packaging box to be gradually corrected in posture before entering the drying chamber, making it easier for it to enter the drying area along the correct path, thereby improving the efficiency and quality of subsequent drying.

[0015] Optionally, the guiding mechanism may further include a plurality of limiting wheels distributed on both sides along the length of the drying chamber, wherein the axis of the limiting wheels is vertically arranged.

[0016] By adopting the above technical solution, multiple limiting wheels are distributed on both sides along the length of the drying chamber, forming a side limiting effect on the packaging box, reducing the possibility that the packaging box deviates from the normal path during the drying process due to unstable operation of the conveyor belt or other external factors, thereby improving the reliability of the entire drying process.

[0017] Optionally, the drying chamber is equipped with an adjustment assembly that drives the two limit wheels to move relative to each other. Each limit wheel in the drying chamber has a mounting frame. The limit wheels are rotatably connected to the mounting frames on the side facing the center of the drying chamber. Several mounting frames located on the side of the conveyor belt conveying direction are connected in series via connecting rods. The adjustment assembly includes parallel adjusting rods, vertically arranged moving racks on opposite sides of the adjusting rods, a drive gear meshing with the two moving racks, and a drive component that drives the drive gear to rotate. One adjusting rod is located above the drying chamber, corresponding to each of the two mounting frames. Each adjusting rod has a vertical rod at its bottom end. The bottom end of the vertical rod passes through the top wall of the drying chamber and is mounted on the corresponding connecting rod. A through groove perpendicular to the conveyor belt conveying direction is opened on the top wall of the drying chamber. The vertical rod is located within the through groove and slides along the guide of the through groove. The drive gear is rotatably mounted on the top wall of the drying chamber. Two moving racks are located on either side of the drive gear. When the drive gear rotates, the two moving racks move relative to each other, driving the two limit wheels to move synchronously relative to each other.

[0018] By adopting the above technical solution, the drive component drives the drive gear to rotate, thereby causing the two meshing moving racks to move relative to each other. This allows the adjusting rod connected to the moving racks and its bottom vertical rod to slide along the guide groove, ultimately causing the mounting frame and the limiting wheel to adjust their positions synchronously. This design allows for flexible adjustment of the limiting wheel's position according to packaging boxes of different sizes or shapes, improving the stability of the packaging boxes on the conveyor belt, reducing uneven drying caused by misalignment, and simultaneously improving the equipment's adaptability and working efficiency.

[0019] Optionally, the driving component includes a rotating rod, a driving bevel gear sleeved on the rotating rod, and a driven bevel gear meshing with the driving bevel gear. The driven bevel gear is sleeved on the top end of the rotating shaft of the driving gear. The rotating rod is parallel to the adjusting rod and located directly above the driving gear. A supporting ear plate is provided between the end of the rotating rod and the top wall of the drying chamber. The rotating rod is rotatably configured with respect to the supporting ear plate, and the end of the rotating rod facing the feeding side of the drying chamber rotates through the supporting ear plate. A handwheel is sleeved on the end that extends through the supporting ear plate.

[0020] By adopting the above technical solution, the operator can manually rotate the handwheel outside the drying chamber to conveniently drive the rotating rod. The precise control of the drive gear is achieved through the cooperation of the driving and driven bevel gears. Transmitting the rotational motion of the handwheel to the drive gear controls the relative movement of the two moving racks, ultimately adjusting the position of the limit wheel. This improves the limit wheel's ability to accurately adapt to the guiding needs of packaging boxes of different sizes and enhances the human-machine interface of the equipment.

[0021] Optionally, a limiting member is provided on the support ear plate near the handwheel to restrict the opposite movement of the two limiting wheels. The limiting member includes a ratchet sleeved on the rotating rod and a pawl inserted into the ratchet. The pawl is located above the ratchet and is rotatably connected to the side wall of the support ear plate by a torsion spring.

[0022] By adopting the above technical solution, the cooperation between the ratchet and the pawl effectively limits the reverse rotation of the rotating rod. During the operation of the drying device, when the packaging box passes between the limiting wheels, even if it is subjected to the squeezing or pushing force of the packaging box, the limiting wheels will not accidentally separate, thus maintaining the stability of the distance between the two limiting wheels. This design significantly reduces the risk of the limiting wheels changing position due to external forces, improves the positioning accuracy of the packaging box during the conveying process, and enhances the operational safety and reliability of the entire drying device.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. The drying unit achieves efficient heat recycling. Heat generated by the heating lamps is drawn in by a fan and evenly distributed throughout the drying chamber via air ducts, ensuring rapid evaporation of moisture from the packaging box surface. Simultaneously, the exhaust duct draws out the hot, humid air from the drying chamber, creating a continuous hot air circulation that effectively reduces localized overheating or cold spots, improving drying uniformity and efficiency. This design not only significantly reduces energy consumption but also enhances the production process's adaptability to environmental factors, improving the quality stability of the finished packaging boxes.

[0025] 2. The reflectors, angled and positioned at the corners of the drying chamber, redirect some of the upward-scattered heat from the heating lamps back to the surface of the packaging boxes, effectively improving heat utilization and enhancing the drying effect. Simultaneously, multiple sets of reflectors distributed along the length of the drying chamber further improve the uniformity of heat coverage throughout the drying area, reducing the occurrence of localized over- or under-drying caused by uneven heat distribution, thereby significantly improving drying efficiency and the drying quality of the packaging boxes.

[0026] 3. The controller can automatically adjust the fan speed and heating power of the heating lamps according to the actual humidity value detected by the humidity sensor, so as to regulate the humidity in the drying chamber within a suitable range, thereby improving drying efficiency and reducing the possibility of packaging boxes being damaged due to excessive drying or excessive humidity. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0028] Figure 2 This is a cross-sectional view showing the internal structure of the drying chamber in the embodiments of this application.

[0029] Figure 3 This is a schematic diagram illustrating the connection relationship between the ratchet, pawl, and lever in an embodiment of this application.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Drying chamber; 11. Through slot; 12. Support ear plate; 13. Scale; 2. Conveyor belt; 3. Heating device; 31. Heating lamp; 32. Reflector; 4. Hot air circulation device; 41. Fan; 42. Exhaust pipe; 43. Supply pipe; 5. Guide mechanism; 51. Guide plate; 52. Limit wheel; 521. Mounting frame; 522. Connecting rod; 523. Vertical rod; 5231. Guide sleeve; 6. Controller; 7. Humidity sensor; 8. Adjustment component; 81. Adjustment rod; 82. Moving rack; 83. Drive gear; 84. Drive component; 841. Rotating rod; 8411. Handwheel; 842. Driving bevel gear; 843. Driven bevel gear; 9. Limiting component; 91. Ratchet; 92. Pawl. Detailed Implementation

[0032] The following is in conjunction with the appendix Figures 1-3 This application will be described in further detail.

[0033] This application discloses a drying device for a packaging machine.

[0034] Reference Figure 1 and Figure 2A drying device for a packaging machine includes a drying chamber 1 and a conveyor belt 2, which runs through the drying chamber 1. A heating device 3, a hot air circulation device 4, and a guiding mechanism 5 are installed inside the drying chamber 1. A controller 6 is fixedly installed on the outer wall of the drying chamber 1 at the feed inlet. In this embodiment, all electrical components are controlled by the controller 6. A humidity sensor 7 is installed at the middle of the inner side wall of the drying chamber 1 and is electrically connected to the controller 6.

[0035] Reference Figure 1 and Figure 2 Packaging boxes, having undergone multiple processes including printing, lamination, and box gluing, fall onto conveyor belt 2 during production. Guided by guide mechanism 5, they follow a predetermined trajectory into the drying area inside drying chamber 1, where they undergo coordinated drying by heating device 3 and hot air circulation device 4. Once dried, they are conveyed out of drying chamber 1 via conveyor belt 2. During this process, controller 6 automatically adjusts the operating status of heating device 3 and hot air circulation device 4 based on the actual humidity value detected by humidity sensor 7, ensuring that the humidity inside drying chamber 1 is always maintained within a suitable range.

[0036] Reference Figure 2 The heating device 3 includes several heating lamps 31 and reflectors 32. The heating lamps 31 are distributed along the length of the drying chamber 1 and installed on the inner top wall of the drying chamber 1. A set of reflectors 32 is provided at each of the four inner corners of the drying chamber 1. In this embodiment, each set of reflectors 32 includes three modularly cut reflectors 32. Each set of reflectors 32 is distributed along the length of the drying chamber 1, and each reflector 32 is inclined towards the center of the drying chamber 1 and installed on the inner side wall of the drying chamber 1. The reflectors 32 enhance the light utilization rate of the heating lamps 31, thereby reducing energy waste.

[0037] Reference Figure 1 One hot air circulation device 4 is located on each side of the drying chamber 1. Each hot air circulation device 4 includes a fan 41, an exhaust pipe 42, and an air supply pipe 43. The exhaust pipe 42 and the air supply pipe 43 are both arranged parallel to the length direction of the drying chamber 1, with the exhaust pipe 42 located above the air supply pipe 43. The exhaust pipe 42 and the air supply pipe 43 are both fixedly connected to the interior of the drying chamber 1 through several connecting short pipes. The fan 41 is located between the exhaust pipe 42 and the air supply pipe 43 and is fixedly installed on the outer wall of the drying chamber 1. The air inlet of the fan 41 is fixedly connected to the exhaust pipe 42, and the air outlet is fixedly connected to the air supply pipe 43. During the drying process of the packaging boxes in transit, the fan 41 extracts the upper hot air through the exhaust pipe 42 and sends it into the drying chamber 1 through the air supply pipe 43, forming a continuous hot air circulation.

[0038] Reference Figure 1 and Figure 2 The guiding mechanism 5 includes a guide plate 51 and a limiting wheel 52. The guide plate 51 is located at the feeding end of the drying box 1, and one is provided on each side along the conveying direction of the conveyor belt 2. One end of the guide plate 51 is fixedly installed on the outer side wall of the drying box 1, and the distance between the two guide plates 51 gradually shortens in the direction away from the drying box 1.

[0039] Reference Figure 1 and Figure 2 The axis of the limiting wheel 52 is vertically set, and several are distributed on both sides along the length of the drying chamber 1. A mounting frame 521 is provided inside the drying chamber 1 corresponding to each limiting wheel 52. The limiting wheel 52 is rotatably connected to the mounting frame 521 on the side facing the middle of the drying chamber 1. Several mounting frames 521 located on the conveyor belt 2's conveying direction are fixedly connected in series by connecting rods 522. A vertical rod 523 is fixedly installed at the top of each end of the connecting rod 522, and the top of the vertical rod 523 protrudes through the top wall of the drying chamber 1. A through groove 11 perpendicular to the conveyor belt 2's conveying direction is opened on the top wall of the drying chamber 1. A guide sleeve 5231 is fixedly fitted inside the through groove 11. The guide sleeve 5231 has an I-shaped cross-section and is clamped to the top wall of the drying chamber 1 according to the thickness of the top wall. The guide sleeve 5231 slides in contact with the through groove 11.

[0040] Reference Figure 1 The drying chamber 1 is provided with an adjustment assembly 8 that drives the two limit wheels 52 on both sides to move relative to each other. The adjustment assembly 8 includes an adjustment rod 81, a moving rack 82, a drive gear 83 and a drive component 84. The adjustment rod 81 is located above the drying chamber 1 and is provided on each of the two mounting frames 521 on both sides. The two adjustment rods 81 are arranged in parallel and are fixedly connected to the top of two vertical rods 523 extending from the top wall of the drying chamber 1 on the same side.

[0041] Reference Figure 1 The movable rack 82 is perpendicular to the adjusting rod 81 and is fixedly mounted on the side wall facing the other adjusting rod 81. The drive gear 83 is rotatably mounted on the top wall of the drying chamber 1. The two movable racks 82 are respectively located on both sides of the drive gear 83 with their tooth tips facing each other, and the drive gear 83 meshes with the two movable racks 82.

[0042] Reference Figure 1The driving component 84 includes a rotating rod 841, a driving bevel gear 842, and a driven bevel gear 843. The rotating rod 841 is parallel to the adjusting rod 81 and located directly above the driving gear 83. A support ear plate 12 is fixedly provided on the top wall of the drying chamber 1 corresponding to the end of the rotating rod 841. The rotating rod 841 is rotatably connected between the two support ear plates 12. The driven bevel gear 843 is fixedly sleeved on the top of the rotating shaft of the driving gear 83. The driving bevel gear 842 meshes with the driven bevel gear 843 and is fixedly sleeved on the rotating rod 841. The end of the rotating rod 841 facing the feeding side of the drying chamber 1 rotates through the support ear plate 12, and a handwheel 8411 is fixedly sleeved on the end that extends through the support ear plate 12.

[0043] Reference Figure 1 and Figure 3 To enhance the stability of the limiting wheel 52 in limiting the packaging box, a limiting member 9 is provided on the support ear plate 12 near the handwheel 8411 to limit the opposite movement of the two limiting wheels 52. The limiting member 9 includes a ratchet 91 and a pawl 92. The ratchet 91 is fixedly sleeved on the rotating rod 841. The pawl 92 is located above the ratchet 91 and is rotatably connected to the side wall of the support ear plate 12 through a torsion spring. The tip of the pawl 92 is inserted into the ratchet 91.

[0044] Reference Figure 1 In order to improve the accuracy of the adjustment of the limit wheels 52 on both sides, a scale 13 is fixed on the top wall of the drying box 1 on the side of the through groove 11 facing outward.

[0045] The principle of a drying device for a packaging machine according to an embodiment of this application is as follows: Before the drying process, the operator manually rotates the handwheel 8411 with the assistance of the scale 13. The drive gear 83 rotates by the cooperation of the active bevel gear 842 and the driven bevel gear 843. The rotation of the drive gear 83 drives the two meshing moving racks 82 to move relative to each other. This causes the adjusting rod 81 connected to the moving rack 82 and the vertical rod 523 at its bottom to slide along the through groove 11. Finally, the mounting frame 521 and the limiting wheel 52 are adjusted synchronously until the distance between the two limiting wheels 52 meets the size of the packaging box to be dried, and then the drying operation can be carried out.

[0046] Packaging boxes, having undergone multiple processes including printing, lamination, and box gluing, fall onto conveyor belt 2 during production. Guided by guide plate 51 and several limiting wheels 52, they maintain a predetermined trajectory as they enter the drying area inside drying chamber 1. There, they undergo coordinated drying treatment by heating lamps 31 and fans 41 until drying is complete, at which point they are conveyed out of drying chamber 1 along with the conveyor belt 2. During this process, controller 6 automatically adjusts the fan speed 41 and the heating power of heating lamps 31 based on the actual humidity value detected by humidity sensor 7, thereby ensuring that the humidity inside drying chamber 1 is always maintained within a suitable range.

[0047] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A drying device for a packaging machine, comprising a drying chamber (1) and a conveyor belt (2), wherein the conveyor belt (2) passes through the drying chamber (1) and is used to sequentially convey packaging boxes through the drying chamber (1), characterized in that... The drying chamber (1) is equipped with a heating device (3) and a hot air circulation device (4). The heating device (3) includes several heating lamps (31), which are distributed along the length of the drying chamber (1) and installed on the inner top of the drying chamber (1). The hot air circulation device (4) includes a fan (41), an exhaust pipe (42), and an air supply pipe (43). The exhaust pipe (42) and the air supply pipe (43) are both parallel to the length of the drying chamber (1) and are connected to the interior of the drying chamber (1) through several connecting short pipes. The exhaust pipe (42) is located above the air supply pipe (43). The fan (41) is located between the exhaust pipe (42) and the air supply pipe (43) and is installed on the outer side wall of the drying chamber (1). The air inlet of the fan (41) is connected to the exhaust pipe (42), and the air outlet is connected to the air supply pipe (43).

2. A drying device for a packaging machine according to claim 1, characterized in that... The heating device (3) also includes a reflector (32). A set of reflectors (32) is provided at the inner corner of the drying chamber (1), and each set of reflectors (32) is inclined toward the center of the drying chamber (1), and each set of reflectors (32) is distributed along the length of the drying chamber (1).

3. A drying device for a packaging machine according to claim 1, characterized in that... A controller (6) is fixedly installed on the outer wall of the drying chamber (1). The fan (41) and the heating lamp (31) are both electrically connected to the controller (6). A humidity sensor (7) electrically connected to the controller (6) is installed inside the drying chamber (1).

4. A drying device for a packaging machine according to claim 1, characterized in that... The drying chamber (1) is provided with a guiding mechanism (5). The guiding mechanism (5) includes a guide plate (51) provided at the feed end of the drying chamber (1). There is one guide plate (51) on each side along the conveying direction of the conveyor belt (2), and the distance between the two guide plates (51) gradually shortens in the direction away from the drying chamber (1).

5. A drying device for a packaging machine according to claim 4, characterized in that... The guiding mechanism (5) also includes several limiting wheels (52) distributed on both sides along the length of the drying box (1), and the axis of the limiting wheels (52) is vertically arranged.

6. A drying device for a packaging machine according to claim 5, characterized in that... The drying chamber (1) is provided with an adjustment assembly (8) that drives the two limit wheels (52) to move relative to each other. Each limit wheel (52) is provided with a mounting frame (521) inside the drying chamber (1). The limit wheels (52) are rotatably connected to the mounting frame (521) on one side facing the middle of the drying chamber (1). Several mounting frames (521) located on the side of the conveyor belt (2) in the conveying direction are connected in series by connecting rods (522). The adjustment assembly (8) includes a parallel adjusting rod (81), a moving rack (82) vertically arranged on the opposite side of the adjusting rod (81), a drive gear (83) meshing with the two moving racks (82), and a drive component (84) that drives the drive gear (83) to rotate. The adjusting rod (81) is located in the drying chamber. The top of the box body (1) is provided with one mounting frame (521) on each side. Each adjusting rod has a vertical rod (523) at the bottom of both ends. The bottom end of the vertical rod (523) passes through the top wall of the drying box body (1) and is set on the corresponding connecting rod (522). The top wall of the drying box body (1) has a through groove (11) perpendicular to the conveying direction of the conveyor belt (2). The vertical rod (523) is located in the through groove (11) and slides along the guide of the through groove (11). The driving gear (83) is rotatably set on the top wall of the drying box body (1). Two moving racks (82) are located on both sides of the driving gear (83). When the driving gear (83) rotates, the two moving racks (82) move relative to each other and drive the limit wheels (52) on both sides to move synchronously relative to each other.

7. A drying device for a packaging machine according to claim 6, characterized in that... The driving component (84) includes a rotating rod (841), a driving bevel gear (842) sleeved on the rotating rod (841), and a driven bevel gear (843) meshing with the driving bevel gear (842). The driven bevel gear (843) is sleeved on the top of the rotating shaft of the driving gear (83). The rotating rod (841) is parallel to the adjusting rod (81) and located directly above the driving gear (83). A support ear plate (12) is provided between the end of the rotating rod (841) and the top wall of the drying chamber (1). The rotating rod (841) and the support ear plate (12) are rotatably arranged. The end of the rotating rod (841) facing the feeding side of the drying chamber (1) rotates through the support ear plate (12), and a handwheel (8411) is sleeved on the end that passes through the support ear plate (12).

8. A drying device for a packaging machine according to claim 7, characterized in that... A limiting member (9) is provided on the support ear plate (12) near the handwheel (8411) to limit the opposite movement of the two limiting wheels (52). The limiting member (9) includes a ratchet (91) sleeved on the rotating rod (841) and a pawl (92) inserted into the ratchet (91). The pawl (92) is located above the ratchet (91) and is rotatably connected to the side wall of the support ear plate (12) by a torsion spring.

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