Drying device for corrugated carton

Abstract

The invention relates to the field of corrugated carton drying equipment, in particular to a drying device for a corrugated carton. A drying device for corrugated cartons comprises a rack and a drying furnace. A feeding conveyor and a discharging conveyor are arranged on the rack, an upper-layer conveying mechanism and a lower-layer conveying mechanism which are arranged in parallel are arranged in the drying chamber, a drying channel is formed between the upper-layer conveying mechanism and the lower-layer conveying mechanism, a plurality of top limiting assemblies are arranged on the upper-layer conveying mechanism at intervals, and a plurality of bottom limiting assemblies are correspondingly arranged on the lower-layer conveying mechanism; wherein the top limiting assembly and the bottom limiting assembly are arranged in a phase difference mode in the conveying direction, an inclined supporting structure for the top edge and the bottom edge of the corrugated carton board is jointly formed, and the corrugated carton board passes through the drying channel in an inclined mode. The heating intensity difference of the upper surface and the lower surface of the corrugated board in the hot air convection type drying equipment can be reduced.

Description

Technical Field

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

[0002] As the core material of modern logistics packaging, the structural strength of corrugated cardboard boxes directly depends on the structural strength of corrugated cardboard sheets. And corrugated cardboard is a multi-layer adhesive body. After bonding, it is necessary to promptly remove the residual moisture in the adhesive and paper fibers. Cardboard with insufficiently evaporated moisture is prone to creep under stacking pressure, which may lead to structural defects such as the collapse of the edges and lines of the box body.

[0003] Existing corrugated cardboard drying equipment mainly includes four major types: steam heat conduction type, infrared radiation type, hot air convection type, and microwave high frequency type. Among them, hot air drying equipment realizes the evaporation of moisture on both sides of the cardboard through forced convection hot air, and has advantages such as fast temperature control response and strong adaptability to continuous production compared with other types of corrugated cardboard drying equipment. Moreover, the waste gas generated during the drying process of hot air drying equipment can be purified and then discharged, reducing the impact on the environment. Therefore, hot air drying equipment has been widely used in industrial production.

[0004] Referring to the Chinese patent document with the publication number CN214620509U, the publication date of November 05, 2021, and the name of corrugated cardboard drying equipment, this patent discloses a hot air drying equipment for drying corrugated cardboard. The temperature in the drying chamber is increased 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 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 locally over-dried due to direct contact with the initial high-temperature air flow. At the same time, the upper surface of the corrugated cardboard can only contact the attenuated hot air after heat exchange through the lower-layer cardboard, resulting in a significant difference in the heating intensity between the upper and lower surfaces of the corrugated cardboard, which may lead to bubbling or warping deformation on the corrugated cardboard, reducing the surface flatness of the corrugated cardboard finished product 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 the heating intensity between the upper and lower surfaces of corrugated cardboard in hot air convection drying equipment.

[0007] The drying device for corrugated cardboard boxes provided by the present invention adopts the following technical solutions: A drying device for corrugated cardboard boxes, comprising a frame and a drying furnace with a drying chamber. A hot air inlet manifold is provided at the bottom of the drying furnace, and an exhaust manifold is provided at the top. An upper conveyor and a lower conveyor are arranged on the frame. An upper conveying mechanism and a lower conveying mechanism are arranged in parallel in the drying chamber, and a drying channel is formed therebetween. A plurality of top limiting components are arranged at intervals on the upper conveying mechanism, and a plurality of bottom limiting components are correspondingly arranged on the lower conveying mechanism. Among them, the top limiting components and the bottom limiting components are arranged in a phase difference in the conveying direction, jointly constituting an inclined support structure for the top edge and the bottom edge of the corrugated cardboard, so that the corrugated cardboard passes through the drying channel in an inclined manner.

[0008] By adopting the above technical solution, the hot air inlet manifold at the bottom of the drying furnace and the exhaust manifold at the top cooperate to form a vertical hot air circulation system. The upper conveying mechanism and the lower conveying mechanism construct a parallel distribution conveying plane in the drying chamber, and a continuous inclined support structure is formed by the top limiting components and the bottom limiting components arranged in a phase difference. When the corrugated cardboard enters the drying channel, its top edge is restricted by the upper limiting component, and the bottom edge is supported by the lower limiting component, forcing the cardboard to be continuously conveyed at a fixed inclination angle, and an asymmetric air flow channel is naturally formed between adjacent cardboard.

[0009] The staggered air flow channel structure formed by the inclined conveying of the corrugated cardboard enables the hot air to generate a three-dimensional convection effect between adjacent cardboard, realizing uniform heating on both sides. This layout effectively eliminates the phenomenon of unilateral overheating caused by traditional horizontal conveying, significantly reduces the risk of bulging defects caused by uneven moisture evaporation. At the same time, the geometric shape of the cardboard in the inclined state can spontaneously guide the air flow to form turbulence to enhance heat transfer, further improving the drying uniformity. The inclined arrangement method greatly improves the space utilization rate of the drying chamber and can accommodate more cardboard to be dried under the same volume. This structural feature prolongs the residence time of the cardboard in the drying channel, realizing a low-temperature and slow-speed drying process, which can not only avoid the damage of the fiber structure caused by high-temperature rapid heating, but also reduce the warping deformation caused by heat stress concentration. The synergistic effect of the two significantly improves the flatness of the finished product and the stability of the mechanical properties while ensuring the production efficiency.

[0010] Optionally, the upper conveying mechanism includes two sets of closed-loop chain drive systems symmetrically arranged along the top of the drying chamber. Each link of the chain is pivotally connected with 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 sets of closed-loop belt drive systems symmetrically arranged along the bottom of the drying chamber, and a plurality of supporting bases corresponding to the upper support arms one by one are fixedly arranged on the conveyor belt; wherein, the L-shaped cantilever structure and the corresponding supporting base form alternately distributed limiting nodes along the conveying track of the corrugated cardboard, and through the synergistic effect of clamping at the top edge and supporting at the bottom edge, the dynamic inclined posture of the corrugated cardboard during conveying is maintained.

[0011] Optionally, the inclination angle of the corrugated cardboard when passing through the drying channel is 30-60°.

[0012] By adopting the above technical solution, the inclination angle of 30-60° achieves the best balance between thermodynamic performance and mechanical stability: a smaller angle (<30°) easily leads to insufficient cross-sectional area of the air flow channel and causes boundary layer retention, while a larger angle (>60°) will weaken the constraint ability of the clamping mechanism on the lateral displacement of the cardboard. This angle range can not only form fully developed turbulent heat transfer conditions, but also utilize the gravity component to enhance the contact pressure between the cardboard and the supporting surface, preventing the posture deviation caused by conveying vibration.

[0013] Optionally, the upper support arm further includes a support rod horizontally pivotally connected to the link of the closed-loop chain drive system. The L-shaped cantilever structure has a guiding slot in contact with the corrugated cardboard on the previous inclined support structure. The actual linear velocity V of the loading conveyor 上料 and the actual linear velocity V of the lower conveying mechanism 下层 The control system between them needs to meet:

[0014] Parameter definition: V 上料 : The actual linear velocity of the loading conveyor; V 下层 : The actual linear velocity of the lower conveying mechanism; : The standard length of a single corrugated cardboard; : The center distance between adjacent supporting bases; : The dynamic compensation margin.

[0015] By adopting the above technical solution, the linear velocity control equation based on geometric parameter matching ensures that the loading conveyor and the lower conveying mechanism form precise phase synchronization. The large dimensional tolerance and thermal expansion deformation of the corrugated cardboard are absorbed through the dynamic compensation margin, avoiding edge collision or excessive gap caused by speed mismatch, and ensuring the continuous and stable conveying of the cardboard in the inclined posture.

[0016] Optionally, it includes the following collaborative control elements: the feeding port and the discharging port of the drying furnace are respectively arranged at the beginning and the end of the drying channel, and the height of the conveying plane of the loading conveyor forms a stepped drop H with the bearing plane of the lower conveying mechanism, and it satisfies: H≥h + Δh, where h is the vertical height of the supporting base, and Δh is a clearance compensation amount of 3 - 5 mm.

[0017] By adopting the above technical solution, the compensation amount design establishes a dynamic balance between mechanical tolerance absorption and thermal expansion tolerance, allowing free compensation for cardboard thickness fluctuations and high-temperature deformations, and maintaining the effective constraint stiffness of the clamping mechanism through micro-clearance control.

[0018] Optionally, a guiding transition section is provided at the end of the loading conveyor, and the radius of curvature R of its curved surface and the thickness d of the corrugated cardboard box board satisfy R=(8 - 12)d.

[0019] By adopting the above technical solution, a geometric adaptation relationship is established between the bending stiffness of the cardboard and the guiding trajectory with a specific curvature ratio, enabling corrugated cardboard box boards of different thicknesses to bear a balanced bending stress distribution within the transition section, avoiding local buckling deformation or mechanical damage to the surface coating, and eliminating inertial offsets caused by sudden changes in the conveying direction through a progressive guiding effect.

[0020] Optionally, the driving sprocket shaft of the closed-loop chain drive system and the driving roller shaft of the belt drive system are connected through a synchronous coupling, and phase calibration scale rings are provided at both ends of the two shafts, and the calibration error is controlled within the range of ±2°.

[0021] By adopting the above technical solution, the rigid connection of the synchronous coupling and the collaborative effect of the phase calibration scale ring eliminate the dynamic cumulative error between the chain drive and the belt drive system, and ensure the strict synchronization of the alternating clamping actions of the upper and lower limit components through real-time phase calibration (±2° error band), avoiding cardboard attitude instability or edge collision damage caused by drive system mismatch.

[0022] Optionally, the discharging conveyor is arranged between two groups of closed-loop belt drive systems, and its conveying plane is coplanar with the bearing plane of the belt drive system.

[0023] Optionally, the bearing surface of the L-shaped cantilever structure is provided with arrayed elastic bumps, and its material is high-temperature resistant silicone rubber.

[0024] By adopting the above technical solution, the arrayed elastic bumps form a dynamic contact stress distribution mechanism, effectively preventing the crushing damage of the surface fibers caused by rigid contact under high-temperature working conditions. The high-temperature resistant silicone rubber material forms controllable local micro-airflow channels at the contact interface, which can not only maintain the positioning accuracy between the cardboard and the bearing surface, but also avoid the blocking effect of the traditional continuous contact surface on the flow field, enabling the hot air turbulence to penetrate into the contact area and eliminating the local drying lag phenomenon caused by the shielding effect.

[0025] In summary, the present invention includes at least one of the following beneficial technical effects: 1. Through the staggered air flow channel structure formed by the inclined conveying of corrugated cardboard, a three-dimensional convection effect is generated between adjacent cardboard sheets for the hot air flow, achieving balanced heating on both sides. This layout effectively eliminates the phenomenon of unilateral 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 can spontaneously guide the air flow to form turbulence to enhance heat transfer, further improving the drying uniformity; 2. The inclined arrangement method greatly improves the space utilization rate of the drying chamber, and can accommodate more cardboard to be dried under the same volume. This structural feature prolongs the residence time of the cardboard in the drying channel, realizing a low-temperature and slow-speed drying process, which can not only avoid damage to the fiber structure caused by high-temperature and rapid heating, but also reduce warping deformation caused by heat stress concentration. The synergistic effect of the two significantly improves the flatness of the finished product and the stability of mechanical properties while ensuring production efficiency. Description of the Drawings

[0026] Figure 1 is the front view of the drying device according to an embodiment of the present invention; Figure 2 is Figure 1 the side view of the drying device in Figure 3 is Figure 2 the A-A cross-sectional view of the drying device in Figure 4 is the structural schematic diagram showing the drying state of the corrugated cardboard; Figure 5 is the structural schematic diagram showing the upper support arm; Figure 6 is Figure 3 the partial enlarged view of area B in Figure 7 is Figure 3 the partial enlarged view of area C in

[0027] Description of the Reference Numerals: 1. Drying chamber; 11. Drying channel; 2. Upper conveying mechanism; 21. Top limiting component; 22. Upper support arm; 221. L-shaped cantilever structure; 2211. Positioning surface; 2212. Supporting surface; 2213. Guiding slot; 222. Support rod; 3. Lower conveying mechanism; 32. Bottom limiting component; 321. Supporting base; 100. Drying device; 101. Frame; 102. Drying furnace; 103. Hot air inlet manifold; 104. Exhaust manifold; 105. Feeding conveyor; 106. Discharging conveyor; 200, Corrugated cardboard box board. Detailed implementation manners

[0028] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying Figure 1 - accompanying Figure 7 , and the technical solutions of the embodiments of the present invention will be clearly and completely described.

[0029] The embodiments of the present invention disclose a drying device for corrugated cardboard boxes.

[0030] Figures 1 - 3 FIG. shows a schematic structural view of the drying device 100 of the embodiments of the present invention, where Figure 1 is the front view, Figure 2 is the side view, Figure 3 is Figure 2 the cross-sectional view under the A-A perspective in Figures 1 - 3 As shown, the drying device 100 includes a frame 101, a feeding conveyor 105, a discharging conveyor 106, and a drying furnace 102 having a drying chamber 1. A plurality of hot air inlet manifolds 103 and a plurality of exhaust manifolds 104 are respectively provided at the bottom and top of the drying furnace 102. The plurality of hot air inlet manifolds 103 and the plurality of exhaust manifolds 104 cooperate to form a vertical hot air circulation system. An upper conveying mechanism 2 and a lower conveying mechanism 3 are arranged in parallel in the drying chamber 1, and a drying channel 11 for the corrugated cardboard box board 200 to pass through is formed therebetween.

[0031] Figure 4 FIG. shows the drying state of the corrugated cardboard box board 200 when it is located in the drying channel 11. As Figure 4 shown, a plurality of top limiting components 21 are arranged at intervals on the upper conveying mechanism 2, and a plurality of bottom limiting components 32 are correspondingly arranged on the lower conveying mechanism 3. Among them, the top limiting components 21 and the bottom limiting components 32 are arranged with a phase difference in the conveying direction, and jointly constitute an inclined support structure for the top edge and the bottom edge of the corrugated cardboard box board 200, so that the corrugated cardboard box board 200 passes through the drying channel 11 in an inclined manner.

[0032] Double optimization is achieved by tilting and conveying the corrugated cardboard 200: First, the tilted arrangement of the corrugated cardboard 200 forms tilted staggered air flow channels between two adjacent corrugated cardboard 200, enabling the hot air in the drying chamber 1 to pass through the tilted staggered air flow channels. The hot air circulates fully between adjacent corrugated cardboard 200, ensuring uniform heating of both sides of the corrugated cardboard 200 and avoiding the bulging problem caused by excessive temperature on one side of the corrugated cardboard 200. Second, the tilted arrangement of the corrugated cardboard 200 greatly improves the space utilization rate in the drying chamber 1, enabling the drying chamber 1 to process more corrugated cardboard 200 within the same volume. Combined with the extended drying time, a low-temperature slow-drying process is realized, which can not only prevent damage to the fiber structure of the corrugated cardboard 200 caused by high-temperature rapid heating but also reduce the bending deformation caused by thermal stress, ultimately significantly improving the flatness and quality stability of the finished product.

[0033] Both the feeding conveyor 105 and the discharging conveyor 106 in the present invention can be belt conveyors or chain conveyors, and their purposes are to achieve the normal conveyance of the corrugated cardboard 200. In actual operation, the feeding conveyor 105 and the discharging conveyor 106 can also be other forms of linear conveying mechanisms, and the specific setting forms are not limited herein.

[0034] In order to smoothly convey the corrugated cardboard 200 into the drying chamber 1, this embodiment provides an implementation manner of the top limiting component 21 and the bottom limiting component 32 in the following description. It should be noted that the top limiting component 21 and the bottom limiting component 32 are not limited to the following implementation manner.

[0035] Figure 5The structure of the upper support arm 22 of the drying device 100 is shown. The upper conveying mechanism 2 includes two sets of closed-loop chain drive systems symmetrically arranged along the top of the drying chamber 1. Each link of the chain is pivotally connected with an upper support arm 22. The upper support arm 22 includes an L-shaped cantilever structure 221 having a positioning surface 2211 and a supporting surface 2212. When the upper support arm 22 supports the top of the corrugated cardboard 200, the positioning surface 2211 limits the highest position of the corrugated cardboard 200, and the supporting surface 2212 is responsible for supporting the top of the corrugated cardboard 200. The lower conveying mechanism 3 includes two sets of closed-loop belt drive systems symmetrically arranged along the bottom of the drying chamber 1. A plurality of supporting bases 321 corresponding one-to-one with the upper support arms 22 are fixedly arranged on the conveyor belts of the closed-loop belt drive systems. Among them, the L-shaped cantilever structure 221 and the corresponding supporting base 321 form alternately distributed limiting nodes along the conveying track of the corrugated cardboard 200, and through the coordinated action of clamping the top edge and supporting the bottom edge, the dynamic inclined posture of the corrugated cardboard 200 during the conveying process is maintained. The L-shaped cantilever structure 221 automatically adapts to the length error of the corrugated cardboard 200, avoiding the situation where the corrugated cardboard 200 cannot smoothly fall into the inclined support structure composed of the L-shaped cantilever structure 221 and the supporting base 321.

[0036] Figure 6 is Figure 3 A partial enlarged view of area A in it, which specifically shows the structure of the joint of the loading conveyor 105 and the lower conveying mechanism 3. The height of the conveying plane of the loading conveyor 105 forms a stepped drop H with the bearing plane of the lower conveying mechanism 3, and satisfies: H≥h + Δh, where h is the vertical height of the supporting base 321, and Δh is a clearance compensation amount of 3 - 5 mm. The compensation amount design establishes a dynamic balance between mechanical tolerance absorption and thermal expansion tolerance, allowing both free compensation for the thickness fluctuation and high-temperature deformation of the corrugated cardboard 200, and enabling the corrugated cardboard 200 to smoothly fall into the inclined support structure composed of the L-shaped cantilever structure 221 and the supporting base 321, ensuring the operation stability under continuous conveying conditions.

[0037] The inclination angle of the corrugated cardboard 200 when passing through the drying channel 11 is 30 - 60°. The inclination angle of 30 - 60° achieves a balance between thermodynamic performance and mechanical stability: when the inclination angle of the corrugated cardboard 200 when passing through the drying channel 11 is relatively small (<30°), it is easy to cause insufficient cross-sectional area of the air flow channel and boundary layer retention; when the inclination angle of the corrugated cardboard 200 when passing through the drying channel 11 is relatively large (>60°), the stability of the corrugated cardboard 200 in the inclined support structure composed of the L-shaped cantilever structure 221 and the supporting base 321 will be reduced. Therefore, this angle range can not only form turbulent heat transfer conditions, but also use the gravity component to enhance the contact pressure between the corrugated cardboard 200 and the supporting surface 2212, preventing the attitude deviation caused by conveying vibration.

[0038] Figure 7 is Figure 3 a partial enlarged view of area B in the figure, which specifically shows the structure of the joint between the lower conveying mechanism 3 and the blanking conveyor 106. It should be noted that in this embodiment, in order to smoothly convey the corrugated cardboard 200 on the lower conveying mechanism 3 to the blanking conveyor 106, the blanking conveyor 106 can be arranged between two sets of closed-loop belt drive systems of the lower conveying mechanism 3, and the conveying plane of the blanking conveyor 106 is on the same horizontal plane as the conveying plane of the closed-loop belt drive system. When the bottom of the corrugated cardboard 200 is received by the blanking conveyor 106, when the upper support arm 22 on the loading conveyor 105 ends the support for the top of the corrugated cardboard 200 (when the conveying stroke of the upper support arm 22 ends and starts to reset), the corrugated cardboard 200 automatically falls under the action of gravity, and then is conveyed out of the drying furnace 102 by the blanking conveyor 106.

[0039] It should be noted that when the above scheme is adopted for conveying, the upper support arm 22 further includes a support rod 222 horizontally pivotally connected to the link of the closed-loop chain drive system. The L-shaped cantilever structure 221 has a guiding slit 2213 that contacts the corrugated cardboard 200 on the previous inclined support structure. When the corrugated cardboard 200 is conveyed from the loading conveyor 105 to the drying chamber 1, the leading end of the corrugated cardboard 200 contacts the previous corrugated cardboard 200 and climbs along the previous corrugated cardboard 200 until it is lifted to the support rod 222 of the L-shaped cantilever structure 221 through the guiding slit 2213, and then is supported by the support rod 222 for subsequent support. The time interval for placing the corrugated cardboard 200 should be determined by the center distance between adjacent supporting bases 321 and the actual linear velocity V of the lower conveying mechanism 3 下层 and should specifically meet the following conditions: V 下层 ; and the actual linear velocity V of the loading conveyor 105 上料 and the actual linear velocity V of the lower conveying mechanism 3 下层 should meet the following:

[0040]

[0041] The definition of the above parameters: V 上料 : the actual linear velocity of the loading conveyor 105 (mm / min); V 下层 : the actual linear velocity of the lower conveying mechanism 3 (mm / min); : the standard length of a single corrugated cardboard 200 (mm); : Center distance between adjacent supporting bases 321 (mm); L: Dynamic compensation margin (mm).

[0042] Next, the necessity of L in the above formula will be explained. When the loading conveyor 105 runs at the actual linear velocity V and the lower conveyor mechanism 3 runs at the actual linear velocity V 上料 and V 下层 and V 上料 and V 下层 meet the following conditions:

[0043] The corrugated cardboard 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 L is introduced at this time, the dimensional tolerance and thermal expansion deformation of the corrugated cardboard 200 can be compensated, ensuring that the corrugated cardboard 200 can be smoothly inserted into the inclined support structure composed of the L-shaped cantilever structure 221 and the supporting base 321.

[0044] A guiding transition section is provided at the end of the loading conveyor 105, and the curvature radius R of its curved surface and the thickness d of the corrugated cardboard 200 satisfy R = (8 - 12)d. The specific curvature ratio enables the corrugated cardboard 200 with different thicknesses to bear a balanced bending stress distribution in the guiding transition section, avoiding local buckling deformation or mechanical damage to the surface coating.

[0045] The driving sprocket shaft of the closed-loop chain drive system and the driving roller shaft of the belt drive system are connected by a synchronous coupling. Phase calibration scale rings are provided at both ends of the two shafts, and the calibration error is controlled within the range of ±2°. The combined action of the rigid connection of the synchronous coupling and the phase calibration scale ring eliminates the dynamic cumulative error between the chain drive and the belt drive system, and ensures the strict synchronization of the alternating clamping actions of the upper and lower limit components through real-time phase calibration (±2° error band), avoiding the attitude instability or edge collision damage of the corrugated cardboard 200 caused by the mismatch of the drive system.

[0046] The supporting surface 2212 of the L-shaped cantilever structure 221 is provided with arrayed elastic bumps. The height of the bumps is 2 - 3 mm, the density is 15 - 20 pieces / dm², and the material is high-temperature resistant silicone rubber. The arrayed elastic bumps can effectively prevent the surface fibers of the corrugated cardboard 200 from being crushed due to rigid contact under high-temperature working conditions. At the same time, the hysteretic damping effect generated by the microscopic deformation can absorb the vibration energy of the conveying system. The viscoelastic characteristics of the high-temperature resistant silicone rubber material and the geometric parameters of the bumps act synergistically to form a controllable local microscopic air flow channel at the contact interface, which can not only maintain the positioning accuracy of the corrugated cardboard 200 and the supporting surface 2212, but also avoid the blocking effect of the traditional continuous contact surface on the flow field, enabling the hot air turbulence to penetrate into the contact area and eliminating the local drying lag phenomenon caused by the shielding effect.

[0047] The implementation principle of the drying device for corrugated cardboard in the embodiment of the present invention is as follows: First, a vertical hot air circulation system is constructed through the hot air inlet manifold 103 and the exhaust manifold 104. On this basis, the upper-layer closed-loop chain drive system and the lower-layer closed-loop belt drive system form a double-layer conveying structure. Among them, 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 difference manner to jointly form an adjustable inclined support structure with an angle of 30 - 60°, so that the corrugated cardboard 200 maintains a stable inclined posture during the conveying process, forming a staggered hot air penetration channel. The rigid synchronization of the sprocket shaft and the driving roller shaft is achieved through a precisely designed synchronous coupling to ensure that the upper-layer closed-loop chain drive system and the lower-layer closed-loop belt drive system maintain precise timing coordination.

[0048] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "vertical", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is 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 should not be construed as a limitation to the present invention.

Claims

1. A drying device for corrugated cardboard boxes, comprising a frame and a drying furnace with a drying chamber. A hot air inlet manifold is provided at the bottom of the drying furnace, and an exhaust manifold is provided at the top. It is characterized in that: An upper conveyor and a lower conveyor are provided on the frame. An upper conveying mechanism and a lower conveying mechanism arranged in parallel are provided in the drying chamber, and a drying channel is formed therebetween. A plurality of top limiting components are arranged at intervals on the upper conveying mechanism, and a plurality of bottom limiting components are correspondingly arranged on the lower conveying mechanism; Among them, the top limiting components and the bottom limiting components are arranged in a phase difference in the conveying direction, jointly constituting an inclined support structure for the top edge and the bottom edge of the corrugated cardboard box board, so that the corrugated cardboard box board passes through the drying channel in an inclined manner.

2. The drying device according to claim 1, characterized in that: The upper conveying mechanism includes two sets of closed-loop chain drive systems symmetrically arranged along the top of the drying chamber. Each link of the chain is pivotally connected with an upper support arm. The upper support arm includes an L-shaped cantilever structure having a positioning surface and a supporting surface; the lower conveying mechanism includes two sets of closed-loop belt drive systems symmetrically arranged along the bottom of the drying chamber, and a plurality of supporting bases corresponding to the upper support arms are fixedly arranged on the conveyor belt thereof; Among them, the L-shaped cantilever structure and the corresponding supporting base form alternately distributed limiting nodes along the conveying track of the corrugated cardboard box board, and through the coordinated action of clamping the top edge and supporting the bottom edge, maintain the dynamic inclined posture of the corrugated cardboard box board during the conveying process.

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

4. The drying device according to claim 2, characterized in that: The upper support arm further includes a support rod horizontally pivotally connected to the link of the closed-loop chain drive system. The L-shaped cantilever structure has a guiding slot in contact with the corrugated cardboard box board on the previous inclined support structure.

5. The drying device according to claim 4, characterized in that The actual linear velocity V of the feeding conveyor 上料 and the actual linear velocity V of the lower conveying mechanism 下层 The control system between them shall meet the following requirements: Parameter definition: V 上料 : Actual linear velocity of the loading conveyor; V 下层 : Actual linear velocity of the lower conveying mechanism; : Standard length of single-piece corrugated cardboard : Center distance between adjacent supporting bases; : Dynamic compensation margin.

6. The drying device according to claim 4, characterized in that, Including the following coordinated control elements: The height of the conveying plane of the upper conveyor forms a stepped drop H with the bearing plane of the lower conveying mechanism, and satisfies: H≥h + Δh Wherein, h is the vertical height of the supporting base, and Δh is a clearance compensation amount of 3 - 5 mm.

7. The drying device according to claim 2, wherein: A guiding transition section is provided at the end of the upper conveyor, and the curvature radius R of its curved surface and the thickness d of the corrugated cardboard box board satisfy R=(8 - 12)d.

8. The drying device according to claim 2, wherein: The driving sprocket shaft of the closed-loop chain drive system and the driving roller shaft of the belt drive system are connected by a synchronous coupling.

9. The drying device according to claim 2, wherein: The lower conveyor is arranged between the two sets of closed-loop belt drive systems, and its conveying plane is coplanar with the bearing plane of the belt drive system.

10. The drying device according to claim 2, characterized in that: The supporting surface of the L-shaped cantilever structure is provided with arrayed elastic bumps, and its material is high-temperature resistant silicone rubber.

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