Multi-air-duct staggered flow guide type intaglio printing energy-saving drying box

Abstract

The invention relates to the technical field of printing equipment, and discloses a multi-air-duct staggered flow guide type intaglio printing energy-saving drying box which comprises an outer box shell, an inner box shell, a plurality of air ducts and a plurality of air ducts, the top flow guide assemblies are arranged on the top face in the outer box shell, and the bottom flow guide assemblies are arranged on the bottom face in the outer box shell; the top flow guide assemblies and the bottom flow guide assemblies are arranged in a staggered mode in the length direction of the drying channel. The top flow guide assembly and the bottom flow guide assembly each comprise an inner container type high-pressure hot air cavity and two backflow shells wrapping the outer portion of the inner container type high-pressure hot air cavity. Self-heating type condensation prevention is achieved through a heat-gas coupling double-cavity structure, the V-shaped heat conduction reinforcing ribs connected between the inner container type high-pressure hot air cavity and the backflow shell serve as a heat bridge, inlet air heat is directly conducted to the wall face of the backflow shell, the wall face temperature is kept above the dew point of a solvent all the time, and therefore the condensation prevention effect is achieved. And the problem of printing waste caused by condensation and dripping of the solvent is fundamentally solved.

Description

Technical Field

[0001] This invention relates to the field of printing equipment technology, and in particular to a multi-channel staggered flow gravure printing energy-saving drying oven. Background Technology

[0002] Gravure printing, a widely used process in flexible packaging, decorative paper, and publication printing, relies heavily on ink drying as one of its core steps. To meet the demands of high-speed printing, modern gravure printing presses typically employ hot air drying systems, utilizing high-temperature, high-speed airflow to impact the surface of the substrate and accelerate solvent evaporation. To prevent the mechanical rollers from contacting the undried ink layer and causing smudging, air-floating drying technology has emerged. This technology uses air cushions formed by upper and lower nozzles to suspend and support the substrate within the drying chamber.

[0003] However, existing air-float drying ovens still face several significant technical challenges in practical applications. Firstly, solvent condensation and dripping is a long-standing problem plaguing the industry. During the drying process, high-concentration solvent waste gas is typically discharged through a return air duct. Since the wall temperature of the return air duct is often lower than the inlet air temperature, and the waste gas contains a high amount of solvent, when the wall temperature falls below the dew point of the solvent vapor, the solvent condenses and accumulates on the inner wall of the return air duct or at the air intake. With the continuous accumulation of condensate, it easily forms droplets that fall onto the surface of the printing substrate being transported, leading to serious printing failures. Existing solutions mostly employ passive insulation methods, such as external wrapping with insulating cotton, which cannot fundamentally increase the surface temperature of the inner wall of the return air duct, thus offering limited anti-condensation effects.

[0004] Secondly, the guide nozzles of existing drying ovens typically employ a rigid structure with a fixed shape, and their airflow separation point is fixed after manufacturing. However, the printing process uses a wide variety of inks, and different ink formulations have different viscosities and leveling characteristics. For low-viscosity inks, if the nozzle's wall-attachment impact force is too strong, it can easily disrupt the ink layer, leading to "orange peel" or "water ripple" phenomena. Conversely, for high-viscosity or thick ink layer printing, insufficient impact force results in low drying efficiency and excessive solvent residue. Existing adjustment methods often only allow for airflow adjustment by changing the fan frequency, but this disrupts the balance of the air flotation lifting force, making it impossible to independently adjust the airflow wall-attachment shape while maintaining stable air flotation, thus lacking adaptability to varying processes.

[0005] Furthermore, the airflow organization of traditional drying ovens often presents a contradiction between hot air short-circuiting and adsorption scratches. To improve drying efficiency, strong negative pressure is needed to promptly remove exhaust gas. However, when the tension of the printing material fluctuates or the air flotation is unstable, excessive suction can easily adsorb and adhere the flexible printing material to the stationary metal nozzles or the surface of the oven, causing scratches or breakage. Simultaneously, some hot air is drawn away by the return air vent before fully contacting the material, resulting in wasted heat energy and reducing the overall energy efficiency ratio of the system. Therefore, this invention provides a multi-channel staggered flow gravure printing energy-saving drying oven to address the shortcomings of existing technologies. Summary of the Invention

[0006] The purpose of this invention is to provide a multi-channel staggered flow gravure printing energy-saving drying oven, which solves the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a multi-channel staggered flow gravure printing energy-saving drying oven, comprising:

[0008] The outer casing has a drying channel inside;

[0009] Several sets of top flow guiding components are disposed on the top surface inside the outer casing, and several sets of bottom flow guiding components are disposed on the bottom surface inside; the top flow guiding components and the bottom flow guiding components are arranged alternately along the length direction of the drying channel;

[0010] Both the top flow guide assembly and the bottom flow guide assembly include an inner high-pressure hot air chamber and two return shells covering the outside of it.

[0011] The two return shells are connected by a corrugated expansion joint;

[0012] A plurality of V-shaped heat-conducting reinforcing ribs are connected between the inner-liner type high-pressure hot air chamber and the two return shells. The tip of each V-shaped heat-conducting reinforcing rib is fixedly connected to the outer wall of the inner-liner type high-pressure hot air chamber, and the other two legs of each V-shaped heat-conducting reinforcing rib are respectively connected to the inner walls of the two return shells. The heat from the inner-liner type high-pressure hot air chamber is used to heat the wall surface of the return shell through the plurality of V-shaped heat-conducting reinforcing ribs.

[0013] Preferably, the two return shells are spliced ​​together to form a semi-circular arc shell structure that only covers the upper half of the inner liner-type high-pressure hot air cavity; a side sealing membrane is connected between the two side edges of the return shell and the side wall of the inner liner-type high-pressure hot air cavity, and the side gap between the return shell and the inner liner-type high-pressure hot air cavity is sealed by the side sealing membrane; a Venturi cover is connected at the bottom air intake of the return shell, and the Venturi cover has an inverted trapezoidal acceleration channel cross section.

[0014] Preferably, a recessed platform shell is fixedly installed at the air outlet end of the inner liner type high-pressure hot air chamber; a flexible Coanda steel sheet is installed on the inner side of the recessed platform shell, one end of the flexible Coanda steel sheet is fixed, and the other end is a free movable end; a contact window is provided on the recessed platform shell;

[0015] It also includes an adjustment shaft disposed outside the sinking platform housing and not in contact with it, an eccentric wheel fixed on the adjustment shaft, the eccentric wheel passing through the contact window and abutting against the back of the flexible Coanda steel sheet; there are multiple adjustment shafts, and the number corresponds one-to-one with the number of sinking platform housings.

[0016] Preferably, the free-moving end of the flexible Kornda steel sheet is provided with two vertically protruding sliding columns; the inner wall of the sinking platform shell is provided with two corresponding guide grooves; the two sliding columns are respectively embedded in the two guide grooves, and slide along the trajectory of the guide grooves when the eccentric wheel pushes the flexible Kornda steel sheet to deform.

[0017] Preferably, it further includes two synchronous adjustment mechanisms disposed outside the outer casing; one end of the adjustment shaft extends to the outside of the outer casing and is equipped with a sprocket, and multiple sprockets on the same side are connected by chain drive;

[0018] The drive end of the synchronous adjustment mechanism is provided with a worm gear and a worm. The worm gear is coaxially fixed with one of the sprockets. The worm is connected to a handwheel. By rotating the handwheel, the chain is driven to run and self-locking is achieved.

[0019] Preferably, it also includes two protective boxes, which are respectively installed on the outer side wall of the outer casing;

[0020] The two protective boxes are respectively used to house and protect the two sets of worm gears and the worm, and the protective boxes do not contact the chain.

[0021] Preferably, the extension direction of the corrugated expansion joint is consistent with the flow direction of the return airflow inside the return shell, in order to compensate for the stress deformation caused by heat.

[0022] Preferably, the inner side of the nozzle outlet of the inner liner-type high-pressure hot air chamber is provided with a downwardly extending baffle lip, which is used to physically prevent hot air from directly entering the air intake of the return shell.

[0023] Preferably, the surface or edge of the Venturi cover is integrated with a plurality of air-floating microtubes, and compressed gas is introduced into the air-floating microtubes to form an air cushion layer on the surface of the Venturi cover.

[0024] Preferably, the outer casing is provided with a number of air ducts, the number of which corresponds one-to-one with the number of flow guiding components; the air ducts are provided with two independent channels inside, which are respectively used to connect to the inner liner-type high-pressure hot air chamber to deliver intake hot air, and to connect to the return shell to collect exhaust gas.

[0025] In summary, the present invention has at least one of the following beneficial technical effects:

[0026] 1. This invention achieves self-heating anti-condensation through a heat-gas coupled dual-cavity structure. Utilizing a V-shaped thermally conductive reinforcing rib connecting the inner high-pressure hot air cavity and the return shell as a thermal bridge, the heat from the incoming air is directly transferred to the return shell wall, ensuring the wall temperature remains above the solvent dew point. This fundamentally eliminates the printing waste problem caused by solvent condensation and dripping. Combined with a corrugated expansion joint connecting the two shells, it effectively compensates for axial thermal stress caused by temperature differences, preventing structural deformation or cracking, and significantly improving the equipment's service life and operational safety.

[0027] 2. This invention achieves continuous dynamic adjustment of the nozzle outlet curvature radius through the cooperation of flexible Kornda steel sheet and external eccentric wheel adjustment mechanism. It can change the wall adhesion effect intensity and impact angle of the airflow in real time according to the changes in ink viscosity and coating amount, solving the problem of poor process adaptability of traditional fixed nozzles. Combined with the self-locking transmission characteristics of worm gear and chain synchronization mechanism, the operator only needs to rotate the handwheel to realize one-click synchronous fine adjustment and position locking of all flow guiding components on one side, which greatly improves the machine adjustment efficiency and process stability.

[0028] 3. This invention utilizes staggered upper and lower flow guiding components in conjunction with a Venturi shroud at the air intake to construct a highly efficient sinusoidal air flotation flow field within the drying channel. The acceleration channel design of the Venturi shroud disrupts the solvent boundary layer, significantly improving drying efficiency. Simultaneously, the inner baffle lip physically blocks hot air short-circuiting, while the air flotation microtubes on the surface of the Venturi shroud provide additional air cushion protection. This effectively avoids surface physical scratches caused by material vibration and mis-adsorption while ensuring strong negative pressure exhaust. Attached Figure Description

[0029] Figure 1 This is a perspective view of the present invention;

[0030] Figure 2 This is a schematic diagram of the duct structure of the present invention;

[0031] Figure 3 for Figure 2 Enlarged view of point B in the middle;

[0032] Figure 4 This is a schematic diagram of the internal structure of the outer casing of the present invention;

[0033] Figure 5 This is a schematic diagram of the reflux shell of the present invention;

[0034] Figure 6 This is a schematic diagram of the inner-liner type high-pressure hot air chamber of the present invention;

[0035] Figure 7 This is a schematic diagram of the structure of the flow-blocking lip of the present invention;

[0036] Figure 8 This is a schematic diagram of the structure of the V-shaped thermally conductive reinforcing rib of the present invention;

[0037] Figure 9 This is a schematic diagram of the structure of the sinking platform shell of the present invention;

[0038] Figure 10 for Figure 9 Enlarged view of point A in the middle.

[0039] The components include: 1. Outer casing; 2. Inner liner type high-pressure hot air chamber; 3. Return shell; 4. Corrugated expansion joint; 5. Side sealing membrane; 6. V-shaped heat-conducting reinforcing rib; 7. Baffle lip; 8. Settled platform shell; 9. Contact window; 10. Flexible Kornda steel sheet; 11. Sliding column; 12. Guide groove; 13. Adjusting shaft; 14. Eccentric wheel; 15. Sprocket; 16. Chain; 17. Venturi cover; 18. Air flotation microtube; 19. Protective box; 20. Worm gear; 21. Worm; 22. Handwheel; 23. Air duct. Detailed Implementation

[0040] The following is in conjunction with the appendix Figure 1 -Appendix Figure 10 The present invention will be further described in detail below.

[0041] This invention provides a multi-channel staggered flow gravure printing energy-saving drying oven, including an outer shell 1. The outer shell 1 is a hollow box structure, and its interior defines a drying channel for the printing material to pass through. Several sets of top flow guiding components are spaced apart along the length direction on the inner top surface of the outer shell 1, and several sets of bottom flow guiding components are spaced apart along the length direction on the inner bottom surface. The top flow guiding components and the bottom flow guiding components are not aligned in the vertical direction, but are staggered along the length direction of the drying channel. This staggered arrangement allows the printing material to be subjected to alternating airflow from above and below when passing through the drying channel, thereby maintaining a suspended state and forming an S-shaped wave-like trajectory, increasing the contact path between the hot air and the material surface.

[0042] The top and bottom flow guiding components have the same core structure, both including an inner high-pressure hot air chamber 2 and a return shell 3 covering it. The inner high-pressure hot air chamber 2 is a hollow cavity with a variable cross-section made of stainless steel. Its central channel is used to introduce high-temperature drying hot air. The end section of the inner high-pressure hot air chamber 2 contracts to form an accelerating nozzle. The return shell 3 is set outside the inner high-pressure hot air chamber 2, and a gap is left between the two to form a negative pressure return channel. In this embodiment, the return shell 3 is designed as a split structure, including two return shells 3. These two return shells 3 are spliced ​​together to form a semi-circular arc shell structure that only covers the upper half of the inner high-pressure hot air chamber 2. The two return shells 3 are connected by a corrugated expansion joint 4. The corrugated extension direction of the corrugated expansion joint 4 is consistent with the flow direction of the return airflow inside the return shell 3. The corrugated expansion joint 4 uses its own elastic deformation capability to compensate for the longitudinal thermal stress deformation of the return shell 3 caused by heat and prevent the shell from cracking.

[0043] To address the issue of solvent condensation and dripping from the inner wall of the reflux shell 3, several V-shaped thermally conductive reinforcing ribs 6 are connected between the inner-liner high-pressure hot air chamber 2 and the two reflux shells 3. These ribs are spaced apart along the length of the flow guide assembly. Each V-shaped rib 6 has a V-shaped structure, with its tip welded and fixed to the outer wall of the inner-liner high-pressure hot air chamber 2. The other two supports are welded and fixed to the inner walls of the two reflux shells 3. The high-temperature hot air flowing inside the inner-liner high-pressure hot air chamber 2 transfers heat to… The heat is then conducted to the return shell 3 through several V-shaped heat-conducting reinforcing ribs 6. This structure keeps the wall temperature of the return shell 3 above the dew point temperature of the solvent gas, preventing the solvent in the exhaust gas from condensing and liquefying. In addition, a side sealing membrane 5 is connected between the two side edges of the return shell 3 and the side wall of the inner liner type high-pressure hot air chamber 2. The side sealing membrane 5 is made of high-temperature resistant flexible material and is used to seal the side gap between the return shell 3 and the inner liner type high-pressure hot air chamber 2 to ensure the sealing of the negative pressure return channel and prevent air leakage from affecting the suction effect.

[0044] A Venturi cover 17 is connected to the air intake at the bottom of the return shell 3. The cross-section of the Venturi cover 17 is an inverted trapezoidal structure that is wider at the top and narrower at the bottom, forming an acceleration channel. This structure uses the Venturi effect to increase the airflow velocity at the intake, thereby quickly peeling off the volatile solvent layer on the surface of the substrate. Several air flotation microtubes 18 are integrated on the surface or edge of the Venturi cover 17. The air flotation microtubes 18 are connected to an external compressed air source and spray gas onto the surface of the Venturi cover 17 to form a high-pressure air cushion layer. When the substrate approaches the Venturi cover 17 due to tension fluctuations, the air cushion layer plays a non-contact support role to prevent the material surface from being physically scratched.

[0045] The outlet end of the inner-liner type high-pressure hot air chamber 2 is fixedly installed with a recessed shell 8. The recessed shell 8 is a frame structure with an internal accommodating space. On the inner side of the nozzle outlet of the inner-liner type high-pressure hot air chamber 2, that is, on the side near the air intake of the return shell 3, there is a downward extending baffle lip 7. The baffle lip 7 is a rigid baffle used to physically block the hot air that has just been ejected from directly short-circuiting into the air intake of the return shell 3, forcing the airflow to come into contact with the printing material before it can turn back.

[0046] To adapt to the different viscosity inks' requirements for airflow adhesion effect, this invention features a variable Coanda flow guiding structure. A flexible Coanda steel sheet 10 is installed inside the sinking platform shell 8. The flexible Coanda steel sheet 10 is made of high-elasticity spring steel, with one end fixed to the inner wall of the sinking platform shell 8 and the other end being a free-moving end. A contact window 9 is provided on the side wall of the sinking platform shell 8. An adjusting shaft 13 is provided outside the sinking platform shell 8. The adjusting shaft 13 does not directly contact the sinking platform shell 8 but is supported by an independent bearing seat. The number of adjusting shafts 13 corresponds one-to-one with the number of sinking platform shells 8. An eccentric wheel 14 is fixed on the adjusting shaft 13. The eccentric wheel 14 passes through the contact window 9 and abuts against the back of the flexible Coanda steel sheet 10.

[0047] To ensure the stability of the deformation process of the flexible Kornda steel sheet 10, two vertically protruding sliding columns 11 are provided at the free movable end of the flexible Kornda steel sheet 10. Correspondingly, two guide grooves 12 are provided on the inner wall of the sinking platform shell 8 to cooperate with it. The two sliding columns 11 are respectively embedded in the two guide grooves 12. When the adjusting shaft 13 rotates and drives the eccentric wheel 14 to push the flexible Kornda steel sheet 10, the flexible Kornda steel sheet 10 undergoes bending deformation to change the radius of curvature. At this time, the sliding columns 11 slide along the trajectory of the guide grooves 12, which restricts the lateral displacement of the steel sheet.

[0048] This embodiment also includes a synchronous adjustment mechanism located outside the outer casing 1, used to uniformly adjust the Coanda effect intensity of the flow guide components on the same side. One end of each adjustment shaft 13 extends to the outside of the outer casing 1 and is equipped with a sprocket 15. Multiple sprockets 15 on the same side, such as the upper or lower row, are connected by a chain 16. The drive end of the synchronous adjustment mechanism is provided with a worm gear 20 and a worm 21. The worm gear 20 is coaxially fixedly connected to one of the sprockets 15. The worm 21 meshes with the worm gear 20, and a handwheel 22 is connected to the end of the worm 21. Two protective boxes 19 are installed on the outer side wall of the outer casing 1. The two protective boxes 19 are used to accommodate and protect the two sets of worm gears 20 and worm 21 respectively, preventing dust from entering and mechanical damage. The protective boxes 19 do not contact the chain 16 and do not interfere with the operation of the chain 16.

[0049] During adjustment, the operator rotates the handwheel 22, which drives the worm gear 21 to rotate, thereby driving the worm wheel 20 and the coaxial sprocket 15 to rotate. The sprocket 15 drives all the sprockets 15 on the same side and the adjusting shaft 13 to rotate synchronously through the chain 16. The eccentric wheel 14 on the adjusting shaft 13 pushes the corresponding flexible Kornda steel sheet 10 synchronously, thereby realizing the synchronous fine adjustment of the curvature of the air outlet of the entire row of air guide components. Since the worm wheel 20 and the worm gear 21 have mechanical self-locking characteristics, after the adjustment is in place, the mechanism can resist the rebound force of the flexible Kornda steel sheet 10 and keep the curvature setting value unchanged.

[0050] The outer casing 1 has several air ducts 23 on its exterior. The number of air ducts 23 corresponds one-to-one with the number of flow guiding components. The air ducts 23 have two independent channels inside, namely the air inlet channel and the air outlet channel. The air inlet channel is connected to the inner liner-type high-pressure hot air chamber 2 and is used to transport the incoming hot air. The air outlet channel is connected to the return shell 3 and is used to collect and discharge the waste gas containing solvent volatiles. This structure realizes the independent air inlet and exhaust function of a single flow guiding unit. With the staggered layout, a highly efficient heat-gas coupling drying environment is constructed.

[0051] Working principle: When the equipment is started, the external high-pressure fan pushes the heated dry air into each inner-tank high-pressure hot air chamber 2 through the air inlet channel of the air duct 23. The high-temperature airflow is accelerated at the contraction nozzle at the end of the inner-tank high-pressure hot air chamber 2, forming a high-speed jet. Since the top guide component and the bottom guide component are staggered along the length direction in the drying channel, and their respective nozzles face the surface of the printing material, the high-speed jet generates alternating fluid dynamic pressure on the upper and lower surfaces of the printing material.

[0052] Based on Bernoulli's principle and fluid dynamics, this staggered airflow forms a sinusoidal pressure distribution on the surface of the printing material, thereby stably suspending and supporting the tensioned printing material (such as plastic film or paper) in the middle of the drying channel, achieving non-contact transmission. When the high-temperature jet comes into contact with the material surface, it quickly removes the solvent components in the ink. Subsequently, the exhaust gas containing solvent is captured by the negative pressure return channel. The external exhaust equipment strongly sucks away the exhaust gas through the exhaust channel of the air duct 23, via the return shell 3 and the Venturi cover 17. The inverted trapezoidal structure of the Venturi cover 17 accelerates the flow rate at the suction port, effectively destroying the solvent boundary layer on the material surface and improving the drying efficiency. During this process, the baffle lip 7 physically blocks the hot air that has just been sprayed from directly short-circuiting into the suction port, ensuring that the heat energy is fully utilized in the drying process. If the material approaches the suction port due to tension fluctuations, the air cushion layer sprayed by the air flotation microtubes 18 on the surface of the Venturi cover 17 provides a reverse thrust to prevent mechanical friction between the material and the metal parts.

[0053] During the drying process, high-temperature hot air (usually between 60°C and 120°C) continuously passes through the inner high-pressure hot air chamber 2. The heat is transferred through the stainless steel inner wall to several V-shaped heat-conducting reinforcing ribs 6 welded to it. Since the V-shaped heat-conducting reinforcing ribs 6 directly connect the inner high-pressure hot air chamber 2 and the return shell 3, they act as an efficient thermal bridge, quickly conducting heat to the wall of the return shell 3.

[0054] The active conduction mechanism keeps the wall temperature of the return shell 3 at a high level, significantly higher than the dew point temperature of the solvent vapor in the exhaust gas. Therefore, when the hot and humid exhaust gas enters the negative pressure return channel formed by the return shell 3, the solvent cannot condense into droplets on the inner wall of the shell, thus completely eliminating the risk of solvent dripping and contaminating the printing material. At the same time, the corrugated expansion joint 4 absorbs the axial displacement of the return shell 3 caused by thermal expansion, eliminating the damage of thermal stress to the structure. The side sealing membrane 5 ensures the lateral airtightness of this thermally coupled structure.

[0055] In response to the differences in ink viscosity and coating thickness in different printing processes, the operator fine-tunes the flow field characteristics of the nozzle through an external synchronous adjustment mechanism. The operator rotates the handwheel 22, which drives the sprocket 15 and chain 16 through the self-locking transmission of the worm 21 and worm wheel 20. The chain 16 synchronously drives multiple adjustment shafts 13 on the same side (e.g., all upper components or all lower components) to rotate.

[0056] The rotation of the adjusting shaft 13 drives the eccentric wheel 14 to rotate. The protruding end of the eccentric wheel 14 pushes against the back of the flexible Kornda steel sheet 10. After being subjected to force, the flexible Kornda steel sheet 10 undergoes elastic deformation and arches outward, and its radius of curvature decreases accordingly. Conversely, when the eccentric wheel 14 retracts, the steel sheet springs back and the radius of curvature increases.

[0057] When high-speed hot air flows across the surface of the flexible Coanda steel sheet 10, according to the Coanda effect (wall adhesion effect), the airflow will adhere to the surface of the steel sheet and be deflected. The change in the radius of curvature directly changes the degree of wall adhesion and the separation point of the airflow, thereby changing the angle and coverage area of ​​the jet impact on the printing material. For example, for high-viscosity inks, the curvature can be increased to enhance the impact force; for low-viscosity, easy-to-level inks, the curvature can be reduced to obtain a softer laminar flow drying effect. The cooperation between the sliding column 11 and the guide groove 12 ensures that the steel sheet always remains centered during the deformation process and does not tilt laterally. After the adjustment is completed, the worm gear 20 and worm 21 automatically lock to maintain the current curvature setting.

Claims

1. A multi-air duct staggered guide type energy saving drying oven for gravure printing, characterized in that, The utility model relates to a kind of drying equipment, including: Outer box shell (1), inside forming with drying channel; Several groups of top flow guide components are arranged on the top surface inside the outer box shell (1), and several groups of bottom flow guide components are arranged on the bottom surface inside the outer box shell (1). The top flow guide components and the bottom flow guide components are staggered along the length direction of the drying channel. The top flow guide components and the bottom flow guide components each include an inner container type high-pressure hot air cavity (2) and two reflux shells (3) wrapped outside the inner container type high-pressure hot air cavity (2). The two reflux shells (3) are connected by a corrugated expansion joint (4). The inner container type high-pressure hot air cavity (2) and the two reflux shells (3) are connected by a plurality of V-shaped heat-conducting reinforcing ribs (6). The tip of each V-shaped heat-conducting reinforcing rib (6) is fixedly connected to the outer wall of the inner container type high-pressure hot air cavity (2). The other two legs of each V-shaped heat-conducting reinforcing rib (6) are respectively connected to the inner walls of the two reflux shells (3). The wall surface of the reflux shell (3) is heated by the heat of the inner container type high-pressure hot air cavity (2) through the plurality of V-shaped heat-conducting reinforcing ribs (6).

2. A multi-air ducts staggered guide-flow type energy saving drying oven for intaglio printing according to claim 1, characterized in that, The two reflux shells (3) are spliced to form a semicircular shell structure that covers only the upper half of the inner container type high-pressure hot air cavity (2). The side edges of the reflux shell (3) and the side walls of the inner container type high-pressure hot air cavity (2) are connected by a side sealing film (5), which seals the side gap between the reflux shell (3) and the inner container type high-pressure hot air cavity (2). A Venturi cover (17) is connected to the bottom air inlet of the reflux shell (3). The Venturi cover (17) has an inverted trapezoidal accelerating flow passage cross section.

3. A multi-air ducts staggered guide vane type energy saving drying oven for intaglio printing according to claim 1, characterized in that, A sunken shell (8) is fixedly installed at the outlet end of the inner container type high-pressure hot air cavity (2). A flexible Coanda steel sheet (10) is installed on the inner side of the sunken shell (8). One end of the flexible Coanda steel sheet (10) is fixed, and the other end is a free end. A contact window (9) is formed on the sunken shell (8). An adjusting shaft (13) is arranged outside the sunken shell (8) and does not contact the sunken shell (8). An eccentric wheel (14) is fixedly installed on the adjusting shaft (13). The eccentric wheel (14) penetrates through the contact window (9) and abuts against the back of the flexible Coanda steel sheet (10). A plurality of adjusting shafts (13) are provided, and the number of adjusting shafts (13) corresponds to the number of sunken shells (8).

4. A multi-air ducts staggered guide vane type energy saving drying oven for intaglio printing according to claim 3, characterized in that, The free end of the flexible Coanda steel sheet (10) is provided with two vertically protruding sliding columns (11). Two guide grooves (12) are formed on the inner wall of the sunken shell (8). The two sliding columns (11) are respectively embedded in the two guide grooves (12). When the eccentric wheel (14) pushes the flexible Coanda steel sheet (10) to deform, the two sliding columns (11) slide along the guide grooves (12).

5. A multi-duct interlaced guide way energy saving drying oven for intaglio printing as claimed in claim 3 wherein, Two synchronous adjusting mechanisms are arranged outside the outer box shell (1). One end of the adjusting shaft (13) extends to the outside of the outer box shell (1) and is provided with a sprocket (15). A plurality of sprockets (15) on the same side are connected by a chain (16). The driving end of the synchronous adjusting mechanism is provided with a worm wheel (20) and a worm (21), the worm wheel (20) is coaxially fixed with one of the chain wheels (15), the worm (21) is connected with a hand wheel (22), the chain (16) is driven to run and self-locked by rotating the hand wheel (22).

6. A multi-duct interlaced guide way energy saving drying oven for intaglio printing as claimed in claim 5 wherein, Two protective boxes (19) are further included and are respectively mounted on the outer side wall of the outer box shell (1); The two protective boxes (19) are respectively used for containing two groups of the worm wheel (20) and the worm (21), and the protective boxes (19) are not in contact with the chain (16).

7. A multi-duct interlaced guide way energy saving drying oven for intaglio printing as claimed in claim 1 wherein, The extension direction of the corrugated expansion joint (4) is consistent with the flow direction of the air flow in the return flow shell (3), and is used for compensating the stress deformation generated by heating.

8. A multi-duct interlaced guide way energy saving drying oven for intaglio printing as claimed in claim 1 wherein, The inner side of the nozzle outlet of the inner container type high-pressure hot air cavity (2) is provided with a downwardly extending flow blocking lip (7), and the flow blocking lip (7) is used for physically blocking the hot air from directly entering the air suction port of the return flow shell (3).

9. A multi-duct interlaced guide way energy saving drying oven for intaglio printing as claimed in claim 2 wherein, The surface or edge of the Venturi cover shell (17) is integrated with a plurality of air floating microtubes (18), the air floating microtubes (18) are connected with compressed gas to form an air cushion layer on the surface of the Venturi cover shell (17).

10. A multi-duct interlaced guide way energy saving drying oven for intaglio printing as claimed in claim 1 wherein, The outer box shell (1) is provided with a plurality of air pipes (23), the number of the air pipes (23) corresponds to the number of the flow guide assemblies; the inside of the air pipe (23) is provided with two independent channels, which are respectively used for connecting the inner container type high-pressure hot air cavity (2) to deliver the inlet hot air and connecting the return flow shell (3) to flow the exhaust gas.

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