A tunnel-type hot air drying apparatus for printing products

Abstract

The application discloses a tunnel type hot air drying device for packaging printed matters and belongs to the field of printed matter drying. The tunnel type hot air drying device comprises a rack and a hot air blower. The inner top of the rack is provided with a wind guide mechanism along a conveying direction. The wind guide mechanism comprises a wind guide plate and an adjusting mechanism for adjusting the inclination angle of each wind guide plate relative to the surface of a conveying belt. A third servo motor drives a chain transmission assembly to rotate a threaded rod, so that a threaded seat moves horizontally. Then, an adjusting rod pushes a supporting strip to change the angle of the wind guide plate. The angle of the wind guide plate is adjusted to a small inclination angle to concentrate vertical air supply, so as to efficiently and uniformly dry a large-area solid bottom printing area. When the printed matter has concave-convex textures or a thick ink layer, the angle of the wind guide plate is adjusted to an inclination angle of 30-45 degrees to form an inclined air flow, effectively cover the side walls of the concave-convex texture area and eliminate drying dead angles. Therefore, the tunnel type hot air drying device is widely applicable to various material and graphic type printed matters, and the use flexibility of the device is improved.

Description

Technical Field

[0001] This invention relates to the field of printing drying technology, and more specifically, to a tunnel-type hot air drying apparatus for packaged printed materials. Background Technology

[0002] Tunnel-type hot air drying equipment is a key piece of equipment in the packaging and printing industry for the continuous drying of printed packaging materials. By placing the printed materials on a conveyor belt and continuously passing them through a box-shaped tunnel equipped with a heating and air supply system, the forced convection of hot air accelerates the evaporation of solvents or moisture in the ink or coating, thereby achieving rapid curing. Existing typical equipment usually uses electric heating tubes or gas to heat the air and uses a fan to circulate the hot air in the tunnel. At the same time, it is equipped with a dehumidification port to discharge high humidity exhaust gas, thus meeting the needs of continuous industrial production.

[0003] However, in actual operation, especially when dealing with heat-sensitive packaging materials such as large-area solid-back printing or multi-layer composite films, the fixed air duct layout and single temperature control strategy of existing equipment result in uneven temperature and air velocity distribution in different areas of the tunnel. This can easily cause local overheating of the printed material while other parts are under-dried. Overheated areas may cause film shrinkage and deformation, affecting the accuracy of subsequent printing; while under-drying can cause ink adhesion or solvent residue, resulting in defective products. The residual organic solvents may also contaminate the items inside the packaging. Summary of the Invention

[0004] In view of the problems existing in the prior art, the purpose of the present invention is to provide a tunnel-type hot air drying device for packaging printed materials, which aims to solve the above-mentioned technical problems.

[0005] To solve the above problems, the present invention adopts the following technical solution.

[0006] A tunnel-type hot air drying device for packaged printed materials includes a frame, a top sealing plate hinged to the top of the frame, and the connection area between the top sealing plate and the frame forming a drying tunnel cavity; a hot air blower is installed at the middle of the top of the top sealing plate, and the output end of the hot air blower is fixedly connected to a conveying pipe, one end of the conveying pipe is provided with a blowing hopper fixedly connected to the top sealing plate to deliver hot air into the drying tunnel cavity; both ends of the frame are fixedly connected to shielding shells; the inner bottom of the frame is provided with a conveyor belt for conveying printed materials, and the inner bottom of the frame is also provided with a drive mechanism for driving the conveyor belt to rotate; the inner top of the frame is provided with an air guiding mechanism along the conveying direction, the air guiding mechanism including multiple air guiding plates spanning above the conveyor belt, and an adjustment mechanism for adjusting the tilt angle of each air guiding plate relative to the surface of the conveyor belt.

[0007] The adjusting mechanism comprises a driving source and a moving assembly connected with the driving source, the moving assembly is driven by the driving source to independently or in groups adjust the inclination angle of at least part of the air deflector, so as to change the distribution path of the hot air in the drying tunnel cavity and adapt to the drying requirements of different printed matters.

[0008] As a further scheme of the present application, the air deflector mechanism further comprises connecting plates fixedly connected to both sides of the inner top wall of the rack, the bottom of each connecting plate is fixedly connected with a vertical plate, and the two vertical plates are jointly fixedly connected with linearly arranged U-shaped clamping plates, the two sides of each U-shaped clamping plate are respectively provided with a load-bearing plate fixedly connected to the bottom of the vertical plate, and the bottom of each load-bearing plate is fixedly connected with a linearly arranged U-shaped frame, and the air deflector is rotatably connected to the inside of the U-shaped frame.

[0009] As a further scheme of the present application, the moving assembly of the adjusting mechanism comprises threaded rods linearly arranged and rotatably connected to the inside of the vertical plate, the outer circular surface of each threaded rod is spirally connected with a linearly arranged threaded seat, the top of each threaded seat is fixedly connected with a sliding plate in sliding fit with the U-shaped clamping plate, the bottom of each threaded seat is fixedly connected with a first hinged seat, the inside of each first hinged seat is hingedly connected with an adjusting rod, the bottom of each adjusting rod is hingedly connected with a second hinged seat, the bottom of each second hinged seat is fixedly connected with a receiving strip plate, and the two ends of each receiving strip plate are fixedly connected with the air deflector; the movement of the adjusting rod drives the movement of the receiving strip plate to change the inclination angle of the air deflector.

[0010] As a further scheme of the present application, the driving source is a third servo motor, one end of each threaded rod penetrates through the inside of the vertical plate and is fixedly connected with the output shaft of the third servo motor, and a chain transmission assembly is jointly installed on the outer circular surface of the side of the linearly arranged threaded rods close to the third servo motor, and the chain transmission assembly is used to synchronously rotate the threaded rods in the vertical plate.

[0011] As a further scheme of the present application, the bottom of the top sealing plate is provided with a blowing assembly, the blowing assembly comprises a dustproof shell fixedly connected to the bottom of the top sealing plate, a plurality of air permeation slots are formed in the top of the dustproof shell, a supporting plate is fixedly connected to the bottom of the dustproof shell, a fan is rotatably connected to the inside of the dustproof shell, and a second servo motor for driving the fan is fixedly installed on the upper surface of the top sealing plate.

[0012] As a further scheme of the present application: the driving mechanism comprises a first driving rod and a second driving rod rotatably connected to the inlet and outlet of the rack respectively, the two ends of the rear side of the rack are fixedly connected with limiting seats for supporting the first driving rod and the second driving rod, the outer circumferential surfaces of the first driving rod and the second driving rod are fixedly connected with a first roller and a second roller respectively, the two end surfaces of the first roller and the second roller are fixedly connected with a first gear and a second gear respectively, the outer circumferential surfaces of the first gear and the second gear are jointly sleeved with a first rack belt, the outer surface of the first rack belt is fixedly connected with a conveying belt, and the middle cavity of the conveying belt is provided with an electric heating pipe fixedly connected with the rack; and one side of the outer surface of the rack is fixedly connected with a first servo motor for driving the first driving rod.

[0013] As a further scheme of the present application: the inside middle part of the rack is provided with a limiting mechanism for fixing the corners of the conveyed printed matter, the limiting mechanism comprises a first rotating rod and a second rotating rod rotatably connected to the inside of the rack, the two ends of the first rotating rod and the second rotating rod are fixedly connected with a third gear and a fourth gear respectively, the outer circumferential surfaces of the third gear and the fourth gear are jointly sleeved with a second rack belt, and the outer surface of the second rack belt is fixedly connected with a chain plate, the surface of the chain plate is fixedly connected with uniformly distributed micro electric telescopic rods, one end of the micro electric telescopic rod is fixedly connected with a supporting seat, and the inside of the supporting seat is rotatably connected with a roller.

[0014] As a further scheme of the present application: one end of the first driving rod penetrates through the rack and is provided with a belt drive assembly used in cooperation with the limiting mechanism, so that the first rotating rod and the first driving rod are synchronously rotated through the belt drive assembly.

[0015] As a further scheme of the present application: the inner bottom of the rack is further provided with an adsorption assembly, the adsorption assembly comprises a storage box slidingly connected to the inner bottom of the rack, the top of the storage box is provided with uniformly distributed notches, the two sides of the inner wall of the storage box are fixedly connected with partition plates, an adsorbing cotton plate is placed above the partition plates, and an activated carbon fiber felt is placed below the partition plates.

[0016] As a further scheme of the present application: the bottom end of the front side of the rack is fixedly connected with an air suction pipe, and the middle part of the air suction pipe is fixedly connected with a connecting pipe.

[0017] The above technical scheme provided by the present application has at least the following beneficial effects compared with the prior art:

[0018] (1) The scheme is characterized in that: the wind guide mechanism and the adjusting mechanism are arranged, a third servo motor drives a chain transmission assembly to rotate a threaded rod, the threaded seat is transversely moved, then an adjusting rod pushes a supporting strip to change the angle of the wind guide plate, the wind guide plate is adjusted to a small inclination angle to concentrate vertical air supply, the efficient and uniform drying effect of a large-area solid printing area is realized; when processing a printed matter with concave-convex texture or thick ink layer, the wind guide plate is adjusted to an inclination angle of 30° to 45° to form a slanting air flow, the effective coverage of the side wall of the concave-convex texture area is realized, the drying dead angle is completely eliminated, and the wide adaptability to various material and graphic type printed matters is realized, and the equipment use flexibility is greatly improved.

[0019] (2) The driving mechanism and the limiting mechanism are arranged, a first servo motor drives a gear and rack transmission system to drive a conveying belt to run, and the limiting mechanism and the conveying belt are synchronously operated through a belt transmission assembly, the precise positioning and stable conveying of the printed matter during the drying process are realized; in the process, a micro electric telescopic rod drives a roller to adjust the height, the flexible clamping of printed matters with different thicknesses is realized, the displacement and curling are effectively prevented, the edge damage is avoided, and the electric heating tube is used to provide bottom heating for the printed matter, which cooperates with the top hot air system to realize a three-dimensional drying environment, the printed matter is uniformly heated in a stable and limited state, the deformation problem caused by single-sided heating is completely solved, and the drying quality and the yield are significantly improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments of the application and, together with the description, further serve to explain the principles of the application and to enable a person skilled in the relevant art to implement and use the application.

[0021] Figure 1 It is a schematic diagram of the overall structure of the application;

[0022] Figure 2 It is a schematic diagram of the connection of the conveying belt of the application;

[0023] Figure 3 It is a side sectional view of the rack of the application;

[0024] Figure 4 It is a schematic diagram of the connection of the driving mechanism and the limiting mechanism of the application;

[0025] Figure 5 It is a schematic diagram of the structure of the limiting mechanism of the application;

[0026] Figure 6 It is a schematic diagram of the connection of the wind guide mechanism of the application;

[0027] Figure 7The schematic view of the connection between the air guiding mechanism and the adjusting mechanism of the present application;

[0028] Figure 8 The schematic view of the structure of the air blowing assembly of the present application;

[0029] Figure 9 The internal view of the adsorption assembly of the present application.

[0030] Reference signs:

[0031] 1, frame; 2, top sealing plate; 3, conveying belt;

[0032] 4, driving mechanism; 41, first roller; 42, first gear; 43, limiting seat; 44, first driving rod; 45, second gear; 46, first rack belt; 47, first servo motor;

[0033] 5, shielding shell; 6, hot air blower; 61, conveying pipe; 62, air blowing hopper; 7, belt transmission assembly;

[0034] 8, limiting mechanism; 81, first rotating rod; 82, third gear; 83, second rotating rod; 84, fourth gear; 85, second rack belt; 86, chain plate; 87, micro electric telescopic rod; 88, roller;

[0035] 9, air blowing assembly; 91, dustproof shell; 92, supporting plate; 93, fan; 94, second servo motor; 10, electric heating pipe;

[0036] 11, air guiding mechanism; 111, connecting plate; 112, vertical plate; 113, U-shaped clamping plate; 114, bearing plate; 115, U-shaped frame; 116, air guiding plate;

[0037] 12, adjusting mechanism; 121, threaded rod; 122, threaded seat; 123, first hinged seat; 124, adjusting rod; 125, supporting strip plate; 126, chain transmission assembly; 127, third servo motor;

[0038] 13, adsorption assembly; 131, storage box; 132, slot; 133, adsorption cotton plate; 134, activated carbon fiber felt; 14, air suction pipe; 141, connecting pipe.

[0039] As shown in the drawings, in order to clearly realize the structure of the embodiments of the present application, specific structures and devices are marked in the drawings, but this is only for the need of illustration, and is not intended to limit the present application in the specific structures, devices and environment, and the devices and environment can be adjusted or modified by those skilled in the art according to specific needs. DETAILED DESCRIPTION

[0040] The tunnel-type hot air drying apparatus for packaged printed materials provided by the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art can use other alternative methods to implement some known technologies; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0041] like Figures 1 to 9 As shown, this embodiment of the invention provides a tunnel-type hot air drying device for packaged printed materials, including a frame 1. A top sealing plate 2 is hinged to the top of the frame 1, and the connection area between the top sealing plate 2 and the frame 1 forms a drying tunnel cavity. A hot air blower 6 is installed at the middle of the top of the top sealing plate 2. The output end of the hot air blower 6 is fixedly connected to a conveying pipe 61. One end of the conveying pipe 61 is provided with a blower 62 fixedly connected to the top sealing plate 2 to deliver hot air into the drying tunnel cavity. Both ends of the frame 1 are fixedly connected to shielding shells 5. The inner bottom of the frame 1 is provided with a conveyor belt 3 for conveying printed materials, and the inner bottom of the frame 1 is also provided with a drive mechanism 4 for driving the conveyor belt 3 to rotate. The inner top of the frame 1 is provided with an air guiding mechanism 11 along the conveying direction. The air guiding mechanism 11 includes multiple air guiding plates 116 that are arranged across the conveyor belt 3, and an adjustment mechanism 12 for adjusting the tilt angle of each air guiding plate 116 relative to the surface of the conveyor belt 3.

[0042] The adjustment mechanism 12 includes a drive source and a moving component connected to the drive source. The drive source drives the moving component to adjust the tilt angle of at least some of the air guide plates 116 independently or in groups, thereby changing the distribution path of hot air in the drying tunnel cavity to adapt to the drying needs of different printed materials.

[0043] To solve the problem of uneven distribution of hot air in the prior art, which leads to local overheating or insufficient drying of the printed matter, the above technical solution is used to solve the problem. The above technical solution mainly consists of a wind guide mechanism 11 and an adjusting mechanism 12. When in use, the third servo motor 127 drives the chain transmission assembly 126 to drive the plurality of threaded rods 121 to rotate synchronously, so that the threaded seats 122 move transversely along the U-shaped clamping plates 113, and then the adjusting rods 124 push the supporting strip plates 125 to realize synchronous adjustment of the angles of the plurality of wind guide plates 116. When processing large-area solid printed matter, the wind guide plates 116 can be adjusted to a smaller inclination angle, so that the hot air is more concentrated and vertically blown to the printed surface. When processing printed matter with concave-convex texture or thick ink layer, the wind guide plates 116 in the corresponding area can be adjusted to a specific inclination angle by the adjusting mechanism 12, so that part of the hot air changes the original vertical flow direction and is blown to the side wall area that cannot be effectively covered by the traditional vertical airflow at an inclination angle, effectively destroying the original airflow shadow area, and ensuring that each part of the concave-convex surface can obtain uniform hot air contact, thereby realizing the elimination of the drying dead angle from the root cause. In the actual operation process, first, the adjustable angle wind guide plate 116 realizes the precise distribution of hot air in the drying tunnel, solves the problem of uneven temperature caused by the traditional fixed air duct, makes the surface of the printed matter evenly heated, and avoids film deformation and inaccurate overprinting. Secondly, the adjusting mechanism 12 is driven by the third servo motor 127 and cooperates with the threaded transmission to realize accurate control and stable maintenance of the angle adjustment, ensuring the stability of the drying quality. Thirdly, by adjusting the wind guide plates 116 in different groups, different drying strategies can be implemented according to the characteristics of different printing areas, which improves the drying efficiency while reducing energy consumption. In addition, the angle-adjustable feature of the wind guide plate 116 enables the device to adapt to printed matter of various materials and graphic types, greatly improving the applicability and flexibility of the equipment.

[0044] As shown in Figures 1 to 9 The wind guide mechanism 11 further includes a connecting plate 111 fixedly connected to the inner top wall of the rack 1, the bottom of the connecting plate 111 is fixedly connected with a vertical plate 112, and the two vertical plates 112 are fixedly connected with a linearly arranged U-shaped clamping plate 113. The two sides of the U-shaped clamping plate 113 are respectively provided with a bearing plate 114 fixedly connected with the bottom of the vertical plate 112, and the bottom of the bearing plate 114 is fixedly connected with a linearly arranged U-shaped frame 115. The wind guide plate 116 is rotatably connected to the inside of the U-shaped frame 115.

[0045] As shown in Figures 1 to 9As shown, the moving assembly of the adjusting mechanism 12 includes threaded rods 121 arranged in a line and rotationally connected inside the vertical plate 112, the outer circular surface of the threaded rods 121 is helically connected with threaded seats 122 arranged in a line, the top of the threaded seats 122 is fixedly connected with a sliding plate slidingly matched with the U-shaped clamping plate 113, the bottom of the threaded seats 122 is fixedly connected with a first hinged seat 123, the inside of the first hinged seat 123 is hingedly connected with an adjusting rod 124, the bottom of the adjusting rod 124 is hingedly connected with a second hinged seat, the bottom of the second hinged seat is fixedly connected with a receiving strip 125, and the two ends of the receiving strip 125 are fixedly connected with the air deflector 116; the movement of the adjusting rod 124 drives the movement of the receiving strip 125, so as to change the inclination angle of the air deflector 116.

[0046] As shown in Figures 1 to 9 The driving source is a third servo motor 127, one end of the threaded rod 121 penetrates through the inside of the vertical plate 112 and is fixedly connected with the output shaft of the third servo motor 127, and the outer circular surface of the threaded rods 121 arranged in a line is commonly provided with a chain transmission assembly 126 on the side close to the third servo motor 127, and the chain transmission assembly 126 is used to synchronously rotate the several threaded rods 121 inside the vertical plate 112.

[0047] To solve the problem of uneven distribution of hot air caused by fixed air duct in the traditional tunnel type drying device and the difficulty in adapting to different drying requirements of printed matter, when it is necessary to adjust the air direction distribution of the drying area, the third servo motor 127 is started, all the threaded rods 121 are driven to rotate synchronously by the chain transmission assembly 126, the rotation of the threaded rods 121 drives the threaded seats 122 on them to move transversely along the U-shaped clamping plate 113, then the first hinged seat 123 pushes the adjusting rod 124 to move, and finally the receiving strip 125 is displaced by the second hinged seat at the bottom of the adjusting rod 124, so that the air deflector 116 rotationally connected in the U-shaped frame 115 is deflected at an angle, effectively solving the problem that the traditional fixed air duct cannot adapt to different drying requirements of printed matter; secondly, when processing printed matter with a raised LOGO or special texture, the air deflector 116 in the corresponding area can be adjusted to an inclination angle of 30° to 45°, so that the hot air acts on the side wall area of the pattern in a oblique flushing manner, effectively solving the problem of insufficient drying of the side wall caused by "shadow effect", ensuring that all kinds of printed matter can obtain the best drying effect, and significantly improving the applicability and production efficiency of the equipment.

[0048] As shown in Figures 1 to 9 The bottom of the top sealing plate 2 is provided with a blowing assembly 9, the blowing assembly 9 includes a dustproof shell 91 fixedly connected to the inside bottom of the top sealing plate 2, the top of the dustproof shell 91 is provided with a plurality of air permeation slots, the bottom of the dustproof shell 91 is fixedly connected with a supporting plate 92, the inside of the dustproof shell 91 is rotationally connected with a fan 93, and the upper surface of the top sealing plate 2 is fixedly provided with a second servo motor 94 for driving the fan 93.

[0049] When the printed matter is hot air dried, the fan 93 is driven by the second servo motor 94 to rotate at high speed inside the dustproof shell 91, a forced convection air flow is generated, the hot air transported from the air blowing chute 62 to the drying tunnel cavity is accelerated to push downward, the hot air can quickly penetrate the static air boundary layer on the surface of the printed matter, effectively solving the low heat transfer efficiency problem caused by the traditional dependence on natural convection of hot air; at the same time, the temperature stratification formed by the density difference of hot air is broken by the stirring action of the fan 93, ensuring the consistency of the longitudinal temperature field in the drying tunnel cavity, avoiding the uneven heating phenomenon of the printed matter due to different heights; during the operation process, the dustproof shell 91 is provided, which provides a stable installation foundation for the fan 93, and the air flow is ensured through the air slot at the top, while preventing dust and sundries from falling into the operation area of the fan 93, ensuring the long-term stable operation of the equipment; when processing special film materials sensitive to temperature, the air blowing assembly 9 and the adjustable angle air guide mechanism 11 work together, the rotating speed of the fan 93 is accurately controlled by the second servo motor 94, and the angle of the air guide plate 116 is adjusted, realizing the composite control of the flow rate and direction of the drying air flow, so that the device can provide enough air flow speed to ensure the drying efficiency, and can avoid the problem of film deformation caused by direct impact of high-speed air flow, significantly improving the drying quality and adaptability of the device to various printed matters.

[0050] As shown in Figures 1 to 9 The driving mechanism 4 includes a first driving rod 44 and a second driving rod rotatably connected to the inlet and outlet of the rack 1 respectively, and the two ends of the rear side of the rack 1 are fixedly connected with limiting seats 43 for supporting the first driving rod 44 and the second driving rod. The outer cylindrical surface of the first driving rod 44 and the second driving rod is fixedly connected with a first roller 41 and a second roller respectively, and the two end surfaces of the first roller 41 and the second roller are fixedly connected with a first gear 42 and a second gear 45 respectively. The outer cylindrical surface of the first gear 42 and the second gear 45 is commonly sleeved with a first rack belt 46, and the outer surface of the first rack belt 46 is fixedly connected with a conveying belt 3. The middle cavity of the conveying belt 3 is provided with an electric heating pipe 10 fixedly connected with the rack 1. One side of the outer surface of the rack 1 is fixedly connected with a first servo motor 47 for driving the first driving rod 44.

[0051] As shown in Figures 1 to 9As shown, the middle of the inside of the rack 1 is provided with a limiting mechanism 8 for fixing the corners of the conveying printed matter, the limiting mechanism 8 comprises a first rotating rod 81 and a second rotating rod 83 which are rotatably connected to the inside of the rack 1, the two ends of the first rotating rod 81 and the second rotating rod 83 are fixedly connected with a third gear 82 and a fourth gear 84 respectively, the outer circular faces of the third gear 82 and the fourth gear 84 are commonly sleeved with a second rack strip 85, and the outer surface of the second rack strip 85 is fixedly connected with a chain plate 86, the surface of the chain plate 86 is fixedly connected with uniformly distributed micro electric telescopic rods 87, one end of the micro electric telescopic rod 87 is fixedly connected with a supporting seat, and the inside of the supporting seat is rotatably connected with a roller 88.

[0052] As shown in the figure, Figures 1 to 9 One end of the first drive rod 44 penetrates the rack 1 and is provided with a belt drive assembly 7 which is used in cooperation with the limiting mechanism 8, and the first rotating rod 81 and the first drive rod 44 are synchronously rotated through the belt drive assembly 7.

[0053] In order to solve the problems that the packaging printed matter is easily displaced and curled due to the impact of hot air in the tunnel drying process, and the traditional fixed limiting device cannot adapt to different sizes of printed matter, when the printed matter is dried, first, the first drive rod 44 is driven to rotate by the first servo motor 47, the first cylinder 41 and the first gear 42 fixedly connected thereto are synchronously rotated, the second gear 45 is driven to rotate by the first rack strip 46, thereby driving the second cylinder to synchronously rotate, and the conveying belt 3 is driven to rotate, thereby completing the conveying work of the printed matter; and in this process, first, the first rotating rod 81 of the limiting mechanism 8 is synchronously rotated by the belt drive assembly 7 (the two ends of the first rotating rod 81 and the first drive rod 44 are fixedly connected with pulleys, and the surfaces of the two pulleys are commonly sleeved with a belt), so that the second rack strip 85 of the limiting mechanism 8 and the conveying belt 3 maintain the same running speed; second, according to the specific thickness of the printed matter, the micro electric telescopic rod 87 is started to drive the supporting seat to be lifted to an appropriate height, so that the bottom of the roller 88 touches the edge of the printed matter, and the two sides of the printed matter are flexibly clamped by the roller 88, which not only effectively prevents the displacement and curling of the printed matter under the impact of hot air, but also avoids the edge damage caused by rigid limiting; and during the conveying process, the electric heating pipe 10 is started to provide bottom heating for the printed matter, and a three-dimensional drying environment is formed with the top hot air system, so that the printed matter is uniformly heated in a stable limiting state, thereby completely solving the deformation problems such as edge curling and middle bulging caused by single direction heating in the traditional drying device, and significantly improving the drying quality and yield.

[0054] As shown in the figure, Figures 1 to 9As shown, the inner bottom of the rack 1 is also provided with an adsorption assembly 13, which includes a storage box 131 slidingly connected to the inner bottom of the rack 1, the top of the storage box 131 is provided with uniformly distributed notches 132, both sides of the inner wall of the storage box 131 are fixedly connected with a partition plate, an adsorbing cotton plate 133 is placed above the partition plate, and an activated carbon fiber felt 134 is placed below the partition plate.

[0055] As shown in the drawings, Figures 1 to 9 The bottom end of the front side of the rack 1 is fixedly connected with an exhaust pipe 14, and the middle of the exhaust pipe 14 is fixedly connected with a connecting pipe 141.

[0056] In order to solve the problem that the volatile organic solvents and harmful gases generated in the hot air drying process of the packaging printed matter accumulate in the device, causing secondary pollution of the printed matter, reducing the drying efficiency, and hidden dangers in the working environment, when in use, the connecting pipe 141 is connected with the external air exhaust equipment, a negative pressure is formed in the exhaust pipe 14, and the exhaust gas in the drying cavity is guided to pass through the notches 132, the adsorbing cotton plate 133 and the activated carbon fiber felt 134 of the adsorption assembly 13 in turn, and finally discharged through the exhaust pipe 14; the specific operation is that, first, the exhaust pipe 14 and the adsorption assembly 13 form a "purification before discharge" working process, which not only effectively removes harmful components in the exhaust gas, but also ensures the normal circulation of the gas in the drying tunnel, avoiding the problem of too high solvent vapor concentration caused by exhaust gas accumulation; secondly, in the process of treating the exhaust gas, the upper adsorbing cotton plate 133 effectively intercepts ink particles and suspended solids to prevent them from clogging the lower activated carbon fiber felt 134; the activated carbon fiber felt 134 in the lower layer deeply adsorbs organic solvent molecules, not only improving the adsorption effect of harmful gas, but also prolonging the service life of the adsorption material; and when treating solvent-based ink high requirement printed matter, the adsorption assembly 13 and the continuous air flow circulation effectively reduce the solvent vapor partial pressure in the drying area, so that the solvent in the ink is continuously volatilized, thereby improving the drying efficiency; at the same time, the air exhaust equipment connected through the connecting pipe 141 can accurately control the exhaust flow, ensuring that the exhaust gas is effectively discharged while not excessively extracting the hot air in the drying tunnel, avoiding unnecessary heat loss; and in the later period, the storage box 131 can be regularly extracted from the rack 1 and replaced with the corresponding adsorption material to ensure effective absorption of the exhaust gas.

[0057] In use, first, start the hot air blower 6, and send the heated air into the drying tunnel cavity through the conveying pipe 61 and the air outlet 62, and at the same time, start the second servo motor 94 to drive the fan 93 to rotate at high speed to form forced convection, and push the hot air downward uniformly to effectively break the temperature stratification phenomenon caused by the difference in air density, and ensure that the temperature distribution in the whole tunnel space is uniform; then, according to the specific characteristics of the to-be-dried printed matter (such as material, ink layer thickness and graphic structure), the air flow direction is accurately controlled, that is, the third servo motor 127 is started, a plurality of threaded rods 121 are driven to rotate synchronously through the chain transmission assembly 126, the threaded seat 122 is driven to move horizontally, and then the inclination angle of the air deflector 116 is changed through the linkage of the adjusting rod 124 and the receiving strip plate 125; that is, when processing a large-area solid printed area, a small inclination angle is adopted, so that the hot air is concentrated and blows vertically downward; while processing areas with concave-convex textures or thick ink layers, the corresponding air deflector 116 is adjusted to an inclination angle of 30° to 45°, so that the hot air acts on the pattern side wall and the recess in a diagonal flushing manner, completely eliminates the drying dead angle, and ensures that the whole printed surface is heated uniformly; at the same time, the first servo motor 47 is started to drive the first driving rod 44 to rotate, the conveying belt 3 is driven to run stably through the intermeshing first gear 42, second gear 45 and first rack belt 46, and the first rotating rod 81 of the limiting mechanism 8 is ensured to run synchronously with the conveying belt 3 through the belt transmission assembly 7; and during the conveying of the printed matter, the height of the roller 88 can be adjusted according to the thickness of the printed matter by using the micro electric telescopic rod 87, so that the roller 88 flexibly clamps and guides the edge of the printed matter, effectively preventing displacement or curling of the printed matter during drying; the electric heating pipe 10 located in the middle cavity of the conveying belt 3 provides stable heating for the bottom of the printed matter, and cooperates with the top hot air system to form a three-dimensional drying environment, so as to inhibit the deformation of the printed matter; finally, the external air extraction equipment is connected with the air extraction pipe 14 through the connecting pipe 141, a stable negative pressure is formed in the system, the solvent-containing waste gas generated during drying is forcedly extracted, the ink particles and suspended matters are effectively intercepted through the slot 132 at the top of the adsorption assembly 13 and the adsorption cotton board 133 in turn, and the organic solvent molecules are deeply adsorbed and purified through the activated carbon fiber mat 134, so as to effectively remove the harmful gas generated during the drying of the printed matter, avoid secondary pollution, connect the connecting pipe 141 with the external air extraction equipment, maintain the appropriate air flow circulation in the tunnel, and realize the unity of drying efficiency and environmental protection safety.

[0058] The present application encompasses any alternatives, modifications, equivalent methods and solutions made to the essence and scope of the present application. In order to make the public have a thorough understanding of the present application, specific details are described in the following preferred embodiments of the present application, and the present application can also be fully understood without the description of these details to those skilled in the art. In addition, in order to avoid unnecessary confusion to the essence of the present application, well-known methods, processes, procedures, elements and circuits, etc. are not described in detail.

[0059] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can also be made, which should be considered as the protection scope of the present application.

Claims

1. A tunnel-type hot air drying device for packaged printed materials, comprising a frame (1), wherein a top sealing plate (2) is hinged to the top of the frame (1), and the connection area between the top sealing plate (2) and the frame (1) forms a drying tunnel cavity; a hot air blower (6) is installed at the middle of the top of the top sealing plate (2), and a conveying pipe (61) is fixedly connected to the output end of the hot air blower (6), wherein one end of the conveying pipe (61) is provided with a blowing hopper (62) fixedly connected to the top sealing plate (2) to convey hot air into the drying tunnel cavity; characterized in that, The frame (1) has shielding shells (5) fixedly connected to both ends of the outlet. The inner bottom of the frame (1) is provided with a conveyor belt (3) for conveying printed materials. The inner bottom of the frame (1) is also provided with a drive mechanism (4) for driving the conveyor belt (3) to rotate. The drive mechanism (4) includes a first drive rod (44) and a second drive rod respectively rotatably connected to the inlet and outlet of the frame (1). The frame (1) has a limiting mechanism (8) for fixing the corners of the conveyed printed materials at the middle of the interior. The limiting mechanism (8) includes a first rotating rod (81) and a second rotating rod (83) rotatably connected to the interior of the frame (1). The first rotating rod (81) and the second rotating rod (83) are respectively fixedly connected to a third gear (82) and a fourth gear (84) at both ends. The outer surfaces of the third gear (82) and the fourth gear (84) are jointly fitted with a second rack belt (85). A chain plate (86) is fixedly connected to the outer surface of the second rack belt (85). A uniformly distributed miniature electric telescopic rod (87) is fixedly connected to the surface of the chain plate (86). A support base is fixedly connected to one end of the miniature electric telescopic rod (87), and a roller (88) is rotatably connected inside the support base. One end of the first drive rod (44) passes through the frame (1) and is provided with a belt drive assembly (7) that works with the limiting mechanism (8). The belt drive assembly (7) enables the first rotating rod (81) to rotate synchronously with the first drive rod (44). An air guide mechanism (11) is provided on the inner top of the frame (1) along the conveying direction. The air guide mechanism (11) includes multiple air guide plates (116) that are arranged across the conveyor belt (3) and an adjustment mechanism (12) for adjusting the tilt angle of each air guide plate (116) relative to the surface of the conveyor belt (3). The adjustment mechanism (12) includes a drive source and a moving component connected to the drive source. The drive source drives the moving component to adjust the tilt angle of at least part of the air guide plate (116) independently or in groups, thereby changing the distribution path of hot air in the drying tunnel cavity to adapt to the drying needs of different printed materials.

2. The tunnel-type hot air drying device for packaged printed materials according to claim 1, characterized in that, The air guiding mechanism (11) also includes connecting plates (111) fixedly connected to both sides of the inner top wall of the frame (1). Each connecting plate (111) has a vertical plate (112) fixedly connected to its bottom. A U-shaped card plate (113) arranged in a linear arrangement is fixedly connected between the two vertical plates (112). Each side of the U-shaped card plate (113) is provided with a load-bearing plate (114) fixedly connected to the bottom of the vertical plate (112). A U-shaped frame (115) arranged in a linear arrangement is fixedly connected to the bottom of the load-bearing plate (114). The air guiding plate (116) is rotatably connected to the inside of the U-shaped frame (115).

3. The tunnel-type hot air drying device for packaged printed materials according to claim 2, characterized in that, The moving component of the adjustment mechanism (12) includes a threaded rod (121) arranged linearly and rotatably connected inside the upright plate (112). The outer surface of the threaded rod (121) is helically connected to a threaded seat (122) arranged linearly. The top of the threaded seat (122) is fixedly connected to a sliding plate that slides with a U-shaped clamping plate (113). The bottom of the threaded seat (122) is fixedly connected to a first hinge seat (123). The first hinge seat (123) is hinged to an adjustment rod (124). The bottom of the adjustment rod (124) is hinged to a second hinge seat. The bottom of the second hinge seat is fixedly connected to a receiving plate (125). Both ends of the receiving plate (125) are fixedly connected to the air guide plate (116). The movement of the adjustment rod (124) drives the receiving plate (125) to move, thereby changing the tilt angle of the air guide plate (116).

4. A tunnel-type hot air drying device for packaged printed materials according to claim 3, characterized in that, The driving source is a third servo motor (127). One end of the threaded rod (121) passes through the interior of the upright plate (112) and is fixedly connected to the output shaft of the third servo motor (127). The threaded rods (121) arranged in a linear fashion are mounted together on the outer circular surface of the side close to the third servo motor (127) with a chain drive assembly (126). The chain drive assembly (126) causes several threaded rods (121) inside the upright plate (112) to rotate synchronously.

5. A tunnel-type hot air drying apparatus for packaged printed materials according to claim 4, characterized in that, The bottom of the top sealing plate (2) is provided with a blower assembly (9). The blower assembly (9) includes a dustproof shell (91) fixedly connected to the bottom of the top sealing plate (2). The top of the dustproof shell (91) is provided with several ventilation slots. The bottom of the dustproof shell (91) is fixedly connected with a support plate (92). The inside of the dustproof shell (91) is rotatably connected with a fan (93). The upper surface of the top sealing plate (2) is fixedly installed with a second servo motor (94) for driving the fan (93).

6. A tunnel-type hot air drying apparatus for packaged printed materials according to claim 5, characterized in that, Both ends of the rear side of the frame (1) are fixedly connected to limiting seats (43) for supporting the first drive rod (44) and the second drive rod. The outer circular surfaces of the first drive rod (44) and the second drive rod are respectively fixedly connected to the first roller (41) and the second roller. The two end faces of the first roller (41) and the second roller are respectively fixedly connected to the first gear (42) and the second gear (45). The outer circular surfaces of the first gear (42) and the second gear (45) are jointly fitted with the first rack belt (46). The outer surface of the first rack belt (46) is fixedly connected to the conveyor belt (3). The middle cavity of the conveyor belt (3) is provided with an electric heating tube (10) fixedly connected to the frame (1). A first servo motor (47) for driving the first drive rod (44) is fixedly connected to one side of the outer surface of the frame (1).

7. A tunnel-type hot air drying apparatus for packaged printed materials according to claim 6, characterized in that, The bottom of the frame (1) is also provided with an adsorption component (13). The adsorption component (13) includes a storage box (131) that is slidably connected to the bottom of the frame (1). The top of the storage box (131) is provided with evenly distributed slots (132). Both sides of the inner wall of the storage box (131) are fixedly connected with partitions. An adsorption cotton board (133) is placed above the partitions, and an activated carbon fiber felt (134) is placed below the partitions.

8. A tunnel-type hot air drying apparatus for packaged printed materials according to claim 7, characterized in that, The bottom of the front side of the frame (1) is fixedly connected to an air extraction pipe (14), and a connecting pipe (141) is fixedly connected to the middle of the air extraction pipe (14).

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