A drying device for corrugated cartons

Abstract

The present application relates to corrugated carton drying equipment field, especially to a kind of corrugated carton drying device.A kind of corrugated carton drying device, including rack and drying furnace;Rack is equipped with feeding conveyor and discharging conveyor, drying chamber is provided with the upper layer conveying mechanism and the lower layer conveying mechanism arranged mutually in parallel, drying channel is formed between the two, multiple top limiting components are arranged at intervals on the upper layer conveying mechanism, and the lower layer conveying mechanism is correspondingly provided with multiple bottom limiting components;Wherein, top limiting component and bottom limiting component form phase difference arrangement in the direction of conveyance, and jointly constitute the inclined support structure to the top edge and bottom edge of corrugated carton board, so that corrugated carton board passes through drying channel in inclined mode.The present application can reduce the heating intensity difference of upper and lower surfaces of corrugated paperboard in hot air convection type drying equipment.

Description

Technical Field

[0001] The present invention relates to the field of corrugated paper box drying equipment, in particular to a drying device for corrugated paper boxes. Background Art

[0002] As a core material for modern logistics packaging, the structural strength of corrugated boxes directly depends on the strength of the corrugated cardboard. Corrugated cardboard is a multi-layered adhesive bond, and residual moisture in the glue and paper fibers must be promptly removed after bonding. Cardboard with incomplete moisture is prone to creep under stacking pressure, leading to structural defects such as edge collapse.

[0003] Existing corrugated cardboard drying equipment primarily includes four types: steam heat conduction, infrared radiation, hot air convection, and microwave high-frequency. Hot air drying equipment, which uses forced convection of hot air to evaporate moisture from both sides of the cardboard, offers advantages over other types of corrugated cardboard drying equipment, such as faster temperature control response and greater adaptability to continuous production. Furthermore, the exhaust gas generated during the drying process can be purified before discharge, minimizing its impact on the environment. Consequently, hot air drying equipment has gained widespread application in industrial production.

[0004] Referring to the Chinese patent document with announcement number CN214620509U and publication date of November 5, 2021, entitled Corrugated Cardboard Drying Equipment, the patent discloses a hot air drying equipment for drying corrugated cardboard. The temperature in the drying chamber is raised by a drying heat source arranged below the drying chamber, and the heat at the bottom of the drying chamber is pumped to the top of the drying chamber by a fan located at the top of the drying chamber, thereby completing the drying of the corrugated cardboard.

[0005] However, the above-mentioned hot air drying equipment has significant defects in actual application: when the hot air flows vertically upward from the bottom of the drying chamber, the lower surface of the corrugated cardboard is directly in contact with the initial high-temperature airflow, resulting in local overdrying of the lower surface of the corrugated cardboard. At the same time, the upper surface of the corrugated cardboard can only be exposed to the attenuated hot air after heat exchange with the lower layer of cardboard, resulting in a significant difference in the heating intensity of the upper and lower surfaces of the corrugated cardboard, which in turn causes bubbling or warping deformation on the corrugated cardboard, reducing the surface flatness of the finished corrugated cardboard and affecting its stability. Summary of the Invention

[0006] In view of this, the present invention provides a drying device for corrugated cardboard boxes, aiming to solve the problem of significant difference in heating intensity between the upper and lower surfaces of the corrugated cardboard in a hot air convection drying device.

[0007] The present invention provides a drying device for corrugated boxes, which adopts the following technical solutions:

[0008] A drying device for corrugated cardboard boxes comprises a frame and a drying furnace with a drying chamber, wherein a hot air intake manifold is provided at the bottom of the drying furnace, and an exhaust manifold is provided at the top; a loading conveyor and a unloading conveyor are provided on the frame, and an upper conveying mechanism and a lower conveying mechanism arranged parallel to each other are provided in the drying chamber, forming a drying channel therebetween, a plurality of top limit assemblies are provided at intervals on the upper conveying mechanism, and a plurality of bottom limit assemblies are provided correspondingly on the lower conveying mechanism; wherein the top limit assemblies and the bottom limit assemblies are staggered in the conveying direction, and together constitute an inclined support structure for the top and bottom edges of the corrugated cardboard box board, so that the corrugated cardboard box board passes through the drying channel in an inclined manner.

[0009] By adopting this technical solution, the hot air intake manifold at the bottom of the drying oven and the exhaust manifold at the top work together to form a vertical hot air circulation system. The upper and lower conveying mechanisms create parallel conveying planes within the drying chamber. Top and bottom limiter assemblies, arranged with phase shifts, form a continuously inclined support structure. When corrugated cardboard sheets enter the drying channel, their top edges are constrained by the upper limiter assemblies, while their bottom edges are supported by the lower limiter assemblies. This forces the sheets to maintain a fixed tilt angle for continuous conveyance, naturally forming asymmetric airflow channels between adjacent sheets.

[0010] The staggered airflow channel structure formed by the inclined conveying of corrugated cardboard sheets allows the hot air flow to produce a three-dimensional convection effect between adjacent cardboard sheets, achieving balanced heating on both sides. This layout effectively eliminates the phenomenon of one-sided overheating caused by traditional horizontal conveying, significantly reducing the risk of bulging defects caused by uneven water evaporation. At the same time, the geometric shape of the cardboard in the inclined state can spontaneously guide the airflow to form turbulence to enhance heat exchange and further improve drying uniformity. The inclined arrangement greatly improves the space utilization of the drying chamber, and can accommodate more cardboard to be dried with the same volume. This structural feature extends the residence time of the cardboard in the drying channel, realizing a low-temperature and slow drying process, which can not only avoid damage to the fiber structure caused by high temperature and rapid heating, but also reduce warping and deformation caused by concentrated thermal stress. The synergistic effect of the two significantly improves the flatness and mechanical stability of the finished product while ensuring production efficiency.

[0011] Optionally, the upper conveying mechanism includes two groups of closed-loop chain transmission systems symmetrically arranged along the top of the drying chamber, each chain link is pivotally connected to an upper support arm, and the upper support arm includes an L-shaped cantilever structure with a positioning surface and a supporting surface; the lower conveying mechanism includes two groups of closed-loop belt transmission systems symmetrically arranged along the bottom of the drying chamber, and a plurality of supporting bases corresponding to the upper support arms are fixedly provided on the conveyor belt; wherein, the L-shaped cantilever structure and the corresponding supporting base form alternatingly distributed limit nodes along the conveying trajectory of the corrugated cardboard board, and maintain the dynamic tilting posture of the corrugated cardboard board during the conveying process through the synergistic effect of top edge clamping and bottom edge support.

[0012] Optionally, the inclination angle of the corrugated cardboard board when passing through the drying channel is 30-60°.

[0013] By adopting this technical solution, an inclination angle of 30-60° achieves an optimal balance between thermodynamic performance and mechanical stability. Smaller angles (less than 30°) can easily lead to insufficient cross-sectional area in the airflow channel, resulting in boundary layer stagnation, while larger angles (greater than 60°) weaken the clamping mechanism's ability to restrain the cardboard's lateral displacement. This angle range not only creates fully developed turbulent heat exchange conditions, but also utilizes gravity to enhance the contact pressure between the cardboard and the support surface, preventing displacement caused by conveying vibrations.

[0014] Optionally, the upper support arm further comprises a support rod horizontally pivoted on a link of a closed-loop chain transmission system, the L-shaped cantilever structure has a guide slot in contact with the corrugated cardboard board on the previous inclined support structure, and the actual linear speed V of the feeding conveyor is 上料 and the actual linear speed V of the lower conveying mechanism 下层 The control system between them must meet the following requirements:

[0015]

[0016] Parameter definition: V 上料 : actual linear speed of the feeding conveyor; V 下层 : Actual linear speed of the lower conveying mechanism; : Standard length of a single corrugated box board; : Center distance between adjacent supporting bases; : Dynamic compensation margin.

[0017] By adopting the above technical solution, the linear speed control equation based on geometric parameter matching ensures precise phase synchronization between the loading conveyor and the lower conveying mechanism. The large dimensional tolerance and thermal expansion deformation of the corrugated cardboard are absorbed by the dynamic compensation margin, avoiding edge collisions or excessive gaps caused by speed mismatch, and ensuring continuous and stable transportation of cardboard in an inclined posture.

[0018] Optionally, the following coordinated control elements are included: the feed port and the discharge port of the drying furnace are respectively arranged at the beginning and end of the drying channel, the conveying plane height of the loading conveyor and the bearing plane of the lower conveying mechanism form a step height H, and satisfy: H≥h+Δh, where h is the vertical height of the supporting base, and Δh is the gap compensation amount of 3-5mm.

[0019] By adopting the above technical solution, the compensation design establishes a dynamic balance between mechanical tolerance absorption and thermal expansion tolerance, allowing free compensation of cardboard thickness fluctuations and high-temperature deformation, while maintaining the effective constraint stiffness of the clamping mechanism through micro-gap control.

[0020] Optionally, a guide transition section is provided at the end of the feeding conveyor, and the curvature radius R of the curved surface and the thickness d of the corrugated box board satisfy R=(8-12)d.

[0021] By adopting the above technical solution, a specific curvature ratio establishes a geometric adaptation relationship between the bending stiffness of the cardboard and the guide track, so that corrugated cardboard boards of different thicknesses are subjected to a balanced bending stress distribution in the transition section, avoiding local buckling deformation or mechanical damage to the surface coating. At the same time, the inertial offset caused by sudden changes in the conveying direction is eliminated through the progressive guiding effect.

[0022] Optionally, the driving sprocket shaft of the closed-loop chain transmission system and the driving roller shaft of the belt transmission system are connected through a synchronous coupling, and phase calibration rings are provided at the ends of the two shafts, and the calibration error is controlled within the range of ±2°.

[0023] By adopting the above technical solution, the rigid connection of the synchronous coupling and the synergistic effect of the phase calibration scale ring eliminate the dynamic cumulative error between the chain drive and belt drive systems. Through real-time phase calibration (±2° error band), the alternating clamping actions of the upper and lower limit assemblies are strictly synchronized, avoiding cardboard posture instability or edge collision damage caused by drive system mismatch.

[0024] Optionally, the unloading conveyor is arranged between two sets of closed-loop belt transmission systems, and its conveying plane is kept coplanar with the load-bearing plane of the belt transmission system.

[0025] Optionally, the supporting surface of the L-shaped cantilever structure is provided with an array of elastic protrusions, which are made of high-temperature resistant silicone rubber.

[0026] By employing this technical solution, an array of elastic bumps creates a dynamic contact stress distribution mechanism, effectively preventing surface fiber crush damage caused by rigid contact under high-temperature conditions. The high-temperature-resistant silicone rubber material forms controllable, localized microscopic airflow channels at the contact interface, maintaining the positioning accuracy between the cardboard and the support surface while avoiding the blocking effect of traditional continuous contact on the flow field. This allows the hot air turbulence to penetrate the contact area, eliminating the local drying lag caused by shielding.

[0027] In summary, the present invention includes at least one of the following beneficial technical effects:

[0028] 1. The staggered airflow channel structure formed by the inclined conveying of corrugated cardboard sheets creates a three-dimensional convection effect between adjacent sheets, achieving balanced heating on both sides. This layout effectively eliminates the one-sided overheating caused by traditional horizontal conveying, significantly reducing the risk of bulging defects caused by uneven moisture evaporation. At the same time, the geometric shape of the cardboard in the inclined state spontaneously guides the airflow to form turbulence, enhancing heat exchange and further improving drying uniformity.

[0029] 2. The tilted arrangement significantly improves the drying chamber's space utilization, accommodating more cardboard within the same volume. This structural feature prolongs the cardboard's residence time within the drying channel, enabling a low-temperature, slow drying process. This prevents damage to the fiber structure caused by rapid heating and reduces warping caused by concentrated thermal stress. This synergistic effect not only ensures production efficiency but also significantly improves the smoothness and mechanical stability of the finished product. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a front view of a drying device according to an embodiment of the present invention;

[0031] Figure 2 yes Figure 1 A side view of the drying device in FIG.

[0032] Figure 3 yes Figure 2 AA sectional view of the drying device in FIG;

[0033] Figure 4 It is a structural diagram reflecting the drying state of corrugated cardboard;

[0034] Figure 5 It is a structural diagram reflecting the upper support arm;

[0035] Figure 6 yes Figure 3 A partial enlarged view of the middle area B;

[0036] Figure 7 yes Figure 3 A partial enlarged view of the middle area C.

[0037] Description of reference numerals:

[0038] 1. Drying chamber; 11. Drying channel;

[0039] 2. Upper conveying mechanism; 21. Top limit assembly; 22. Upper support arm; 221. L-shaped cantilever structure; 2211. Positioning surface; 2212. Supporting surface; 2213. Guide slit; 222. Support rod;

[0040] 3. Lower conveying mechanism; 32. Bottom limit assembly; 321. Support base;

[0041] 100. Drying device; 101. Rack; 102. Drying oven; 103. Hot air intake manifold; 104. Exhaust manifold; 105. Loading conveyor; 106. Unloading conveyor;

[0042] 200. Corrugated cardboard. DETAILED DESCRIPTION

[0043] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following will be combined with the appended drawings of the embodiments of the present invention. Figure 1 -Attached Figure 7 , clearly and completely describe the technical solutions of the embodiments of the present invention.

[0044] The embodiment of the present invention discloses a drying device for corrugated paper boxes.

[0045] Figure 1-Figure 3 The structure diagram of the drying device 100 according to the embodiment of the present invention is shown. Figure 1 For the main view, Figure 2 is a side view, Figure 3 for Figure 2 The cross-sectional view from the AA perspective. Figure 1-Figure 3 As shown, the drying device 100 comprises a frame 101, a loading conveyor 105, a unloading conveyor 106, and a drying furnace 102 with a drying chamber 1. Multiple hot air intake manifolds 103 and exhaust manifolds 104 are respectively provided at the bottom and top of the drying furnace 102. These multiple hot air intake manifolds 103 and exhaust manifolds 104 cooperate to form a vertical hot air circulation system. The drying chamber 1 is provided with an upper conveyor mechanism 2 and a lower conveyor mechanism 3 arranged parallel to each other, forming a drying passage 11 between them for the corrugated cardboard sheets 200 to pass through.

[0046] Figure 4 The drying state of the corrugated cardboard board 200 in the drying channel 11 is shown. Figure 4As shown, the upper conveying mechanism 2 is provided with a plurality of top stop assemblies 21 at intervals, and the lower conveying mechanism 3 is provided with a plurality of bottom stop assemblies 32 at corresponding intervals. The top stop assemblies 21 and the bottom stop assemblies 32 are staggered in the conveying direction, together forming an inclined support structure for the top and bottom edges of the corrugated cardboard board 200, allowing the corrugated cardboard board 200 to pass through the drying channel 11 at an angle.

[0047] By obliquely conveying the corrugated cardboard boards 200, double optimization is achieved: First, the oblique arrangement of the corrugated cardboard boards 200 forms an oblique staggered airflow channel located between two adjacent corrugated cardboard boards 200, so that the hot air in the drying chamber 1 passes through the oblique staggered airflow channel, and the hot air is fully circulated between the adjacent corrugated cardboard boards 200, ensuring that both sides of the corrugated cardboard boards 200 are evenly heated, avoiding the bulging problem caused by excessive temperature on one side of the corrugated cardboard boards 200; Second, the oblique arrangement of the corrugated cardboard boards 200 greatly improves the space utilization rate in the drying chamber 1, so that the drying chamber 1 can process more corrugated cardboard boards 200 in the same volume, and the low-temperature slow drying process is realized with the extended drying time, which can not only prevent the fiber structure of the corrugated cardboard boards 200 from being damaged by high temperature and rapid heat, but also reduce the bending deformation caused by thermal stress, and ultimately significantly improve the flatness and quality stability of the finished product.

[0048] The loading conveyor 105 and the unloading conveyor 106 in the present invention can both be belt conveyors or chain conveyors, and their purpose is to achieve normal transportation of corrugated cardboard boards 200. In actual operation, the loading conveyor 105 and the unloading conveyor 106 can also be other forms of linear conveying mechanisms, and the specific setting form is not limited here.

[0049] In order to smoothly transport the corrugated cardboard board 200 into the drying chamber 1, this embodiment provides an implementation method of the top limit component 21 and the bottom limit component 32 in the following description. It should be noted that the top limit component 21 and the bottom limit component 32 are not limited to the following implementation method.

[0050] Figure 5The structure of the upper support arm 22 of the drying device 100 is shown. The upper conveying mechanism 2 comprises two closed-loop chain drive systems arranged symmetrically along the top of the drying chamber 1. Each chain link is pivotally connected to an upper support arm 22. The upper support arm 22 comprises an L-shaped cantilever structure 221 with a positioning surface 2211 and a supporting surface 2212. When the upper support arm 22 supports the top of the corrugated cardboard board 200, the positioning surface 2211 limits the highest position of the corrugated cardboard board 200, while the supporting surface 2212 provides top support for the corrugated cardboard board 200. The lower conveying mechanism 3 comprises two closed-loop belt drive systems arranged symmetrically along the bottom of the drying chamber 1. Multiple supporting bases 321 corresponding to the upper support arms 22 are fixedly mounted on the conveyor belts of the closed-loop belt drive systems. The L-shaped cantilever structure 221 and its corresponding support base 321 form alternating limit nodes along the conveying path of the corrugated cardboard board 200. The top edge clamping and bottom edge support work together to maintain the dynamic tilt of the corrugated cardboard board 200 during conveyance. The L-shaped cantilever structure 221 automatically adapts to length errors of the corrugated cardboard board 200, preventing the corrugated cardboard board 200 from being unable to smoothly fall into the inclined support structure formed by the L-shaped cantilever structure 221 and the support base 321.

[0051] Figure 6 for Figure 3 A partial enlarged view of center area A specifically illustrates the structure of the junction between the loading conveyor 105 and the lower conveying mechanism 3. The conveying plane height of the loading conveyor 105 forms a step height H with the load-bearing plane of the lower conveying mechanism 3, satisfying the following: H ≥ h + Δh, where h is the vertical height of the support base 321 and Δh is the gap compensation of 3-5 mm. This compensation design establishes a dynamic balance between mechanical tolerance absorption and thermal expansion tolerance, allowing for free compensation of thickness fluctuations and high-temperature deformation of the corrugated cardboard board 200 while enabling the corrugated cardboard board 200 to smoothly fall into the inclined support structure formed by the L-shaped cantilever structure 221 and the support base 321, ensuring operational stability under continuous conveying conditions.

[0052] The inclination angle of the corrugated cardboard board 200 when passing through the drying duct 11 is 30-60 degrees. This inclination angle strikes a balance between thermodynamic performance and mechanical stability: when the inclination angle of the corrugated cardboard board 200 when passing through the drying duct 11 is relatively small (less than 30 degrees), it can easily lead to insufficient cross-sectional area of ​​the airflow channel, resulting in boundary layer retention; when the inclination angle of the corrugated cardboard board 200 when passing through the drying duct 11 is relatively large (greater than 60 degrees), it reduces the stability of the corrugated cardboard board 200 in the inclined support structure composed of the L-shaped cantilever structure 221 and the support base 321. Therefore, this angle range can not only create turbulent heat exchange conditions, but also utilize the gravity component to enhance the contact pressure between the corrugated cardboard board 200 and the support surface 2212, preventing posture deviation caused by conveying vibration.

[0053] Figure 7 for Figure 3 A partial enlarged view of area B in the center specifically illustrates the structure of the junction between the lower conveyor mechanism 3 and the unloading conveyor 106. It should be noted that in this embodiment, to ensure smooth transport of the corrugated cardboard sheets 200 from the lower conveyor mechanism 3 to the unloading conveyor 106, the unloading conveyor 106 is positioned between the two closed-loop belt drive systems of the lower conveyor mechanism 3, with the conveying plane of the unloading conveyor 106 and the conveying plane of the closed-loop belt drive systems being coplanar. Once the bottom of the corrugated cardboard sheet 200 is received by the unloading conveyor 106 and the upper support arm 22 on the loading conveyor 105 ceases supporting the top of the corrugated cardboard sheet 200 (when the upper support arm 22 completes its conveying stroke and begins to return to its original position), the corrugated cardboard sheet 200 automatically falls under the action of gravity and is subsequently transported out of the drying oven 102 by the unloading conveyor 106.

[0054] It should be noted that when the above-mentioned solution is used for conveying, the upper support arm 22 also includes a support rod 222 horizontally pivoted on the chain link of the closed-loop chain transmission system, and the L-shaped cantilever structure 221 has a guide slot 2213 that contacts the corrugated cardboard board 200 on the previous inclined support structure. When the corrugated cardboard board 200 is conveyed to the drying chamber 1 by the loading conveyor 105, the head end of the corrugated cardboard board 200 contacts the previous corrugated cardboard board 200 and climbs along the previous corrugated cardboard board 200 until it is lifted to the support rod 222 of the L-shaped cantilever structure 221 through the guide slot 2213 and subsequently supported by the support rod 222. The time interval for feeding the corrugated cardboard board 200 The center distance between adjacent supporting bases should be 321 and the actual linear velocity V of the lower conveying mechanism 3 下层 The decision shall specifically meet the following conditions:

[0055] V 下层 ;

[0056] The actual linear velocity V of the feeding conveyor 105 is 上料 and the actual linear velocity V of the lower conveying mechanism 3 下层 The following conditions must be met:

[0057]

[0058]

[0059] The above parameter definitions: V 上料 : Actual linear speed of feeding conveyor 105 (mm / min); V 下层 : Actual linear speed of lower conveying mechanism 3 (mm / min); : Single piece of corrugated cardboard 200 standard length (mm); : Center distance between adjacent supporting bases 321 (mm); L: Dynamic compensation margin (mm).

[0060] Next, for the above formula The necessity of L is explained, when the feeding conveyor 105 is at the actual linear speed V 上料 The lower conveying mechanism 3 is running at the actual linear speed V 下层 Running, and V 上料 and V 下层 When the following conditions are met:

[0061] The corrugated cardboard board 200 can be continuously inserted into the inclined support structure composed of the L-shaped cantilever structure 221 and the supporting base 321. If the dynamic compensation margin is introduced at this time L can compensate for the dimensional tolerance and thermal expansion deformation of the corrugated cardboard board 200, ensuring that the corrugated cardboard board 200 can be smoothly inserted into the inclined support structure composed of the L-shaped cantilever structure 221 and the supporting base 321.

[0062] The end of the loading conveyor 105 is provided with a guide transition section. The curvature radius R of the curved surface satisfies the equation R = (8-12)d, which corresponds to the thickness d of the corrugated cardboard board 200. This specific curvature ratio ensures that the corrugated cardboard boards 200 of varying thicknesses experience a balanced bending stress distribution within the guide transition section, preventing localized buckling deformation or mechanical damage to the surface coating.

[0063] The active sprocket shaft of the closed-loop chain drive system and the drive roller shaft of the belt drive system are connected by a synchronous coupling. Phase calibration rings are installed at the ends of both shafts, and the calibration error is controlled within a ±2° range. The synergistic effect of the synchronous coupling's rigid connection and the phase calibration ring eliminates dynamic cumulative errors between the chain and belt drive systems. Real-time phase calibration (with a ±2° error band) ensures strict synchronization of the alternating clamping action of the upper and lower limit assemblies, preventing the corrugated cardboard board 200 from becoming unstable or damaging due to edge collisions caused by drive system mismatch.

[0064] The supporting surface 2212 of the L-shaped cantilever structure 221 is equipped with an array of elastic bumps, with a height of 2-3mm and a density of 15-20 bumps / dm², made of high-temperature resistant silicone rubber. Under high-temperature conditions, the array of elastic bumps can effectively prevent the surface fibers of the corrugated cardboard board 200 from being crushed due to rigid contact. At the same time, the hysteresis damping effect generated by microscopic deformation can absorb the vibration energy of the conveying system. The viscoelastic properties of the high-temperature resistant silicone rubber material and the geometric parameters of the bumps work together to form controllable local microscopic airflow channels at the contact interface. This not only maintains the positioning accuracy of the corrugated cardboard board 200 and the supporting surface 2212, but also avoids the blocking effect of traditional continuous contact on the flow field, allowing hot air turbulence to penetrate into the contact area and eliminating the local drying lag caused by the shielding effect.

[0065] The operating principle of a corrugated cardboard drying device according to an embodiment of the present invention is as follows: First, a vertical hot air circulation system is established through the hot air intake manifold 103 and the exhaust manifold 104. On this basis, an upper closed-loop chain drive system and a lower closed-loop belt drive system form a double-layer conveying structure. The L-shaped cantilever structure 221 of the chain drive system and the supporting base 321 of the belt drive system are arranged in a phase-shifted manner, together forming a 30-60° adjustable tilt support structure. This allows the corrugated cardboard board 200 to maintain a stable tilt during conveyance, forming staggered hot air penetration channels. A precisely designed synchronous coupling achieves rigid synchronization between the sprocket shaft and the drive roller shaft, ensuring precise timing coordination between the upper closed-loop chain drive system and the lower closed-loop belt drive system.

[0066] In the description of the present invention, it should be understood that the terms "vertical", "horizontal", etc. indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

Claims

1. A drying device for corrugated paper boxes, comprising a frame and a drying oven with a drying chamber, wherein a hot air intake manifold is provided at the bottom of the drying oven and an exhaust manifold is provided at the top, characterized in that: The frame is provided with a loading conveyor and a unloading conveyor, and the drying chamber is provided with an upper conveying mechanism and a lower conveying mechanism arranged in parallel with each other, forming a drying channel therebetween, and the upper conveying mechanism is provided with a plurality of top limit assemblies at intervals, and the lower conveying mechanism is provided with a plurality of bottom limit assemblies correspondingly; The top limiting assembly and the bottom limiting assembly are staggered in the conveying direction, and together form an inclined support structure for the top and bottom edges of the corrugated cardboard board, so that the corrugated cardboard board passes through the drying channel in an inclined manner; The upper conveying mechanism comprises two sets of closed-loop chain transmission systems symmetrically arranged along the top of the drying chamber, each chain link of which is pivotally connected to an upper support arm, and the upper support arm comprises an L-shaped cantilever structure having a positioning surface and a supporting surface; the lower conveying mechanism comprises two sets of closed-loop belt transmission systems symmetrically arranged along the bottom of the drying chamber, and a plurality of supporting bases corresponding to the upper support arms are fixedly provided on the conveyor belt; Among them, the L-shaped cantilever structure and the corresponding supporting base form alternatingly distributed limit nodes along the conveying track of the corrugated cardboard board, and maintain the dynamic tilting posture of the corrugated cardboard board during the conveying process through the synergistic effect of top edge clamping and bottom edge support.

2. The drying device according to claim 1, characterized in that: The inclination angle of the corrugated cardboard board when passing through the drying channel is 30-60 degrees.

3. The drying device according to claim 1, characterized in that: The upper support arm further comprises a support rod horizontally pivoted on a link of a closed-loop chain transmission system, and the L-shaped cantilever structure has a guide slot contacting the corrugated cardboard box board on the previous inclined support structure.

4. The drying device according to claim 3, characterized in that: The actual linear speed V of the feeding conveyor 上料 and the actual linear speed V of the lower conveying mechanism 下层 The control system between them must meet the following requirements: Parameter definition: V 上料 : Actual linear speed of feeding conveyor; V 下层 : Actual linear speed of the lower conveying mechanism; : Standard length of a single corrugated box board; : Center distance between adjacent supporting bases; : Dynamic compensation margin.

5. The drying device according to claim 3, characterized in that: The following collaborative control elements are included: The conveying plane height of the loading conveyor forms a step height H with the bearing plane of the lower conveying mechanism, and satisfies: H≥h+Δh Where h is the vertical height of the supporting base, and Δh is the gap compensation of 3-5 mm.

6. The drying device according to claim 1, characterized in that: The end of the feeding conveyor is provided with a guide transition section, the curvature radius R of the curved surface and the thickness d of the corrugated paper box board satisfy R=(8-12)d.

7. The drying device according to claim 1, characterized in that: The driving sprocket shaft of the closed-loop chain transmission system and the driving roller shaft of the belt transmission system are connected through a synchronous coupling.

8. The drying device according to claim 1, characterized in that: The unloading conveyor is arranged between two sets of closed-loop belt transmission systems, and its conveying plane is kept coplanar with the bearing plane of the belt transmission system.

9. The drying device according to claim 1, characterized in that: The supporting surface of the L-shaped cantilever structure is provided with an array of elastic protrusions, which are made of high-temperature resistant silicone rubber.

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