Low surface energy substrate inkjet coating drying low temperature drying apparatus

Abstract

The application is applied to the field of low-temperature drying, and discloses a low-surface-energy substrate ink-jet coating drying low-temperature drying equipment. The upper and lower guide plates of the horizontal flow assembly are arranged in a staggered mode to increase air flow resistance, so that the air flow is forced to spread horizontally, and the un-solidified coating is protected from being blown. On this basis, gap adjusting assemblies are additionally arranged at both ends of the horizontal flow assembly. When the temperature rises, the temperature sensing sheet shrinks, drives the pre-rising strip to rise, and the air blocking sheet expands. The guide flow gap is dynamically narrowed to increase the resistance. The higher the temperature is, the smaller the gap is. The fan speed can be self-adaptively improved to strengthen heat dissipation, so that the dynamic balance between heat dissipation intensity and coating protection is realized. In addition, a design based on temperature sensing is further arranged to change the air outlet angle. When the temperature is too high, the temperature sensing spring pitch is increased, the supporting force is retrieved, the pre-vertical section is lowered under the action of gravity, the air flow assumes a diffusion form of "small inlet and large outlet", the air flow is further smoothed, the coverage range is further expanded, and the impact on the un-solidified ink-jet coating is reduced.

Description

Technical Field

[0001] This invention relates to the field of low-temperature drying, and in particular to a low-temperature drying device for inkjet coating drying of low surface energy substrates. Background Technology

[0002] Low surface energy substrates (such as PP, PE, PET plastic films and release paper) have poor surface wettability, making it difficult for inkjet coatings to adhere and cure. This necessitates extremely strict requirements for temperature uniformity and airflow stability during the drying and curing process. Current mainstream inkjet coating drying technologies mainly include hot air drying, infrared radiation drying, and ultraviolet curing (UV curing). UV curing technology is widely used in inkjet printing on low surface energy substrates due to its fast curing speed and relatively low energy consumption.

[0003] During the UV curing process, the UV curing lamp generates a significant amount of heat during startup and operation. If this heat cannot be dissipated in time, the temperature inside the drying chamber will continue to rise, affecting not only the lifespan of the UV curing lamp itself but also potentially causing thermal deformation of low surface energy substrates, leading to cracking or poor adhesion of the inkjet coating. Therefore, effectively dissipating heat from the lamp source during UV curing while preventing airflow within the drying chamber from impacting the uncured inkjet coating is a critical technical challenge that needs to be addressed in the design of inkjet coating drying equipment for low surface energy substrates.

[0004] Chinese utility model patents CN211195495U and CN114146857B disclose a high-power air-cooled UV drying device for inkjet printing and a coating device for a continuous aluminum strip production line, both of which dissipate heat from the drying area using air cooling. However, these solutions typically employ forced convection for heat dissipation, which can cause the airflow to impact the uncured inkjet coating, leading to scratches or leveling defects and affecting the quality of the cured coating. Summary of the Invention

[0005] 1. Technical problems to be solved The core of this invention lies in increasing airflow resistance by misaligning the upper and lower guide plates of the advection component, thereby forcing the airflow to diffuse horizontally and protecting the uncured coating from being blown away.

[0006] 2. Technical Solution To solve the above problems, the present invention adopts the following technical solution.

[0007] A low-temperature drying device for inkjet coating of low surface energy substrate includes a support frame, a conveyor belt assembly mounted on the support frame, and a curing chamber mounted on the upper middle part of the conveyor belt assembly. The curing chamber includes a drying chamber located in the middle, a left air inlet chamber near the feeding side of the curing chamber, and a right air inlet chamber near the discharging side of the curing chamber. The left and right air inlets are fixedly connected to the drying chamber. Multiple axial flow fans are installed on both the left and right air inlets. The multiple axial flow fans penetrate the side wall of the drying chamber and communicate with the interior of the drying chamber. Multiple top centrifugal fans and a top air guide hood are fixedly connected to the top of the drying chamber. The air inlets of the multiple top centrifugal fans communicate with the top air guide hood. The lower end of the top air guide hood communicates with the interior of the drying chamber. An exhaust hood is also fixedly connected to the upper end of the drying chamber. An exhaust pipe is fixedly connected to the upper end of the left air inlet chamber. The multiple top centrifugal fans are located inside the left air inlet chamber. The right air intake compartment is also fixedly installed with a lower centrifugal fan and a lower air guide hood. An air guide pipe is fixedly connected between the upper end of the right air intake compartment and the exhaust pipe. The air inlet and exhaust outlet of the lower centrifugal fan are respectively connected to the lower air guide hood and the air guide pipe. Two frames are also fixedly connected to the middle of the upper end of the bracket. A perforated support plate is fixedly connected between the two frames. The perforated support plate is located inside the belt body of the conveyor belt assembly, and the upper end of the perforated support plate is in contact with the lower end of the belt body. The upper end of the frame near the lower centrifugal fan and the end near the perforated support plate are respectively provided with an upper air guide hole and a side air guide hole. The side air guide hole is connected to the inside of the perforated support plate, and both the upper air guide hole and the side air guide hole are connected to the inside of the frame. The drying chamber has two fixed support rods. Multiple UV curing lamps are installed at the lower ends of the two support rods through multiple connecting rods. Advection components are set between two adjacent UV curing lamps and between the left air intake and the adjacent UV curing lamps. The advection components include an upper guide plate fixedly connected to the end of the UV curing lamp near the left air intake and a lower guide plate fixedly connected to the outer end of the left air intake or to the bottom of the UV curing lamp away from the left air intake through a connecting strip. The upper guide plate and the lower guide plate are parallel to each other and staggered.

[0008] Furthermore, the lower end of the upper air deflector is flush with the lower surface of the UV curing lamp, the lower air deflector is lower than the upper air deflector, and the lower air deflector does not coincide with the bottom of the UV curing lamp on the side away from the left air intake when viewed from above.

[0009] Furthermore, along the direction of movement of the conveyor belt assembly, the overlap range of the upper and lower guide vanes in the multiple horizontal flow components becomes smaller and smaller in the top view angle, and the gap in the vertical direction becomes larger and larger.

[0010] Optionally, the advection assembly is also provided with two gap adjustment assemblies. The two gap adjustment assemblies are located at the front and rear ends of the upper guide plate, respectively. The gap adjustment assembly includes a top plate connected above the end of the upper guide plate by a pad block, a gap adjustment plate located at the upper end of the lower guide plate, and multiple temperature sensing plates fixedly connected between the gap adjustment plate and the top plate. A groove is opened at the upper end of the side of the lower guide plate away from the left air intake, the gap adjustment plate is located in the groove, and the gap adjustment plate is fixedly connected to the side wall of the groove.

[0011] Furthermore, the regulating plate includes an air-blocking plate and a pre-lifting bar fixedly connected to multiple temperature-sensing plates. The temperature-sensing plates are made of double-path memory alloy material, and the distance between the top plate and the lower guide plate is not less than twice the distance between the top plate and the upper guide plate.

[0012] Furthermore, two guide rods are fixedly connected between the bottom of the groove and the lower end of the upper guide plate, and the guide rods move through the pre-lift bar.

[0013] Optionally, the lower guide vane or pre-lift bar includes a horizontal section, a pre-bending section, and a pre-vertical section. The pre-bending section is made of an elastic material, while the horizontal section and the pre-vertical section are made of rigid materials. The horizontal section is arranged parallel to the upper guide vane.

[0014] Furthermore, multiple interconnected mounting holes are provided inside the horizontal section, the pre-bending section, and the pre-vertical section. The three interconnected mounting holes form an adjustment hole. A metal wire and a sensing spring sleeved outside the metal wire are fixedly connected to the adjustment hole near the inner wall of the left air intake. The ends of the sensing springs extend into the pre-vertical section.

[0015] Furthermore, under normal temperature conditions, the sensing spring is in a contracted state, and the length of the end of the sensing spring within the pre-sag section is no more than 1 / 4 of the length of the corresponding mounting hole. The mounting hole within the pre-sag section is a blind hole, and the metal wire is fixedly connected to the radial inner wall of the blind hole.

[0016] 3. Beneficial Effects Compared with the prior art, the advantages of this invention are: (1) In this scheme, under the setting of the advection component, the upper and lower guide plates are staggered to increase the airflow resistance, which forces the airflow to diffuse horizontally, protects the uncured coating from being blown away, and can appropriately increase the flow rate of the circulating airflow to enhance heat dissipation.

[0017] (2) Add gap adjustment components at both ends of the advection component. The temperature sensing plate shrinks as the temperature rises, which drives the pre-lift bar to rise and the air baffle to extend, dynamically narrowing the gap between the upper guide plate and the pre-lift bar, increasing the airflow resistance. The higher the temperature, the smaller the gap, which can adaptively increase the fan speed to enhance heat dissipation, while protecting the inkjet coating from high-speed airflow interference, thus achieving a dynamic balance between heat dissipation intensity and coating protection.

[0018] (3) The lower guide plate is set as a horizontal section, a pre-bending section and a pre-drooping section, and metal wires and sensing springs are installed inside it. When the temperature rises, the pitch of the sensing spring increases and the supporting force weakens. The pre-drooping section naturally droops under the action of gravity, so that the airflow takes the form of "small opening in and large opening out" diffusion pattern, further smoothing the airflow, expanding the coverage area, and effectively reducing the impact on the uncured inkjet coating. Attached Figure Description

[0019] Figure 1 This is a perspective view of the present invention; Figure 2 This is a partial cross-sectional view of the present invention; Figure 3 This is a schematic diagram of the air intake path of the lower fan of the present invention; Figure 4 This is a schematic diagram of the interior of the drying chamber of the present invention; Figure 5 This is a schematic diagram of multiple UV curing lamps according to the present invention; Figure 6 This is a three-dimensional schematic diagram of the advection component in the second embodiment of the present invention; Figure 7 This is a three-dimensional schematic diagram of the advection component in the second embodiment of the present invention when the temperature is too high; Figure 8 This is a comparison diagram of the advection component before and after temperature change in the second embodiment of the present invention; Figure 9 This is a schematic diagram of the lower guide plate in the third embodiment A of the present invention; Figure 10 This is a top view of the lower guide vane in the third embodiment A of the present invention; Figure 11 This is a schematic cross-sectional view of the lower guide vane in the third embodiment A of the present invention; Figure 12 This is a schematic diagram comparing the sag of the lower guide plate at different temperatures in case A of the third embodiment of the present invention; Figure 13 This is a schematic diagram of the advection assembly when the temperature is too high in the third embodiment A of the present invention; Figure 14 This is a front view of the advection component in the third embodiment B of the present invention; Explanation of the labels in the diagram: 1. Bracket, 101. Frame, 102. Perforated support plate, 2. Conveyor belt assembly, 3. Curing chamber, 31. Drying chamber, 32. Right air intake chamber, 33. Left air intake chamber, 34. Exhaust pipe, 35. Exhaust hood, 301. Air guide pipe, 302. Upper air guide hole, 303. Side air guide hole, 4. UV curing lamp, 401. Support rod, 5. Axial flow fan, 61. Top centrifugal fan, 601. Top air guide hood, 62. Lower centrifugal fan, 602. Lower air guide hood, 71. Upper guide plate, 72. Lower guide plate, 701. Connecting strip, 702. Guide rod, 731. Pre-lifting strip, 732. Air baffle, 74. Temperature sensing plate, 75. Top plate, 721. Horizontal section, 722. Pre-bending section, 723. Pre-vertical section, 801. Mounting hole, 81. Metal wire, 82. Sensing spring. Detailed Implementation

[0020] The technical solutions will now be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention.

[0021] First implementation method: Please see Figure 1-2 A low-temperature drying device for inkjet coating of low surface energy substrates includes a support 1, a conveyor belt assembly 2 mounted on the support 1, and a curing chamber 3 mounted on the upper middle part of the conveyor belt assembly 2. The curing chamber 3 includes a drying chamber 31 located in the middle, a left air inlet chamber 33 near the feeding side of the curing chamber 3, and a right air inlet chamber 32 near the discharging side of the curing chamber 3. The left air inlet chamber 33 and the right air inlet chamber 32 are both fixedly connected to the drying chamber 31. Two support rods 401 are fixedly connected inside the drying chamber 31. Multiple UV curing lamps 4 are installed at the lower ends of the two support rods 401 through multiple connecting rods. During operation, the substrate is laid on the belt of the conveyor belt assembly 2, so that the substrate enters the drying chamber 31 from the left air inlet chamber 33, is cured by irradiation of multiple UV curing lamps 4, and finally exits from the right air inlet chamber 32 after curing.

[0022] Multiple axial flow fans 5 are installed on both the left air intake compartment 33 and the right air intake compartment 32. These fans penetrate the side wall of the drying chamber 31 and communicate with its interior. Both the left and right air intake compartments 33 and 32 have external air intake windows with mesh panels to allow outside air to enter them and ultimately into the drying chamber 31. Multiple top centrifugal fans 61 and a top air guide hood 601 are fixedly connected to the top of the drying chamber 31. The air inlets of the top centrifugal fans 61 communicate with the top air guide hood 601, and the lower end of the top air guide hood 601 communicates with the interior of the drying chamber 31. An exhaust fan is also fixedly connected to the upper end of the drying chamber 31. The left air intake chamber 33 is fixedly connected to the upper end of the cover 35 and the exhaust pipe 34. Multiple top centrifugal fans 61 are located inside the left air intake chamber 33. When the inkjet printer on the substrate surface is dried by this equipment, the outside ambient temperature air can be blown into the drying chamber 31 by multiple axial flow fans 5 on the right air intake chamber 32 and the left air intake chamber 33, so that heat convection occurs between the air and the surface of the multiple UV curing lamps 4 inside. At the same time, the multiple top centrifugal fans 61 can draw out the air that has absorbed heat in the drying chamber 31, so that the air inside the drying chamber 31 circulates to enhance air convection, thereby quickly removing the heat generated by the UV curing lamps 4 after startup.

[0023] like Figure 3 Inside the right air intake compartment 32, a lower centrifugal fan 62 and a lower air guide hood 602 are also fixedly installed. An air guide pipe 301 is fixedly connected between the upper end of the right air intake compartment 32 and the exhaust pipe 34. The air inlet and outlet of the lower centrifugal fan 62 are connected to the lower air guide hood 602 and the air guide pipe 301, respectively. Two frame frames 101 are fixedly connected to the middle of the upper end of the support 1. A perforated support plate 102 is fixedly connected between the two frame frames 101. The perforated support plate 102 is located inside the belt body of the conveyor belt assembly 2, and its upper end is in contact with the lower end of the belt body. An upper air guide hole 302 and a side air guide hole 303 are respectively opened on the upper end of the frame frame 101 near the lower centrifugal fan 62 and on the end near the perforated support plate 102. The side air guide hole 303 communicates with the interior of the perforated support plate 102, and both the upper air guide hole 302 and the side air guide hole 303 communicate with the interior of the frame frame 101. Figure 3 When the equipment dries the inkjet printing on the substrate surface, the lower centrifugal fan 62 is turned on simultaneously. It generates an adsorption force on the air inside the porous support plate 102, thereby causing the gas inside to enter the exhaust pipe 34 along the side air guide hole 303, the upper air guide hole 302, the lower air guide cover 602, the lower centrifugal fan 62 and the air guide pipe 301, and be discharged together with the high temperature gas discharged by the multiple top centrifugal fans 61.

[0024] It is worth noting that the porous support plate 102 is a flat hollow shell structure with a porous mesh surface on its upper surface. When the lower centrifugal fan 62 starts and generates an adsorption force inside the porous support plate 102, the adsorption force can be evenly distributed upwards under the action of the mesh surface of the porous support plate 102. The belt body of the conveyor belt assembly 2 is a Teflon PTFE coated glass fiber mesh belt with mesh holes on its surface. The adsorption force generated by the lower centrifugal fan 62 can pass through the belt body of the conveyor belt assembly 2, thereby stably adsorbing the inkjet-coated substrate transported on it onto the surface of the belt body. This makes it less likely for the airflow inside the drying chamber 31 to cause problems such as curling or wrinkling of thin substrates, effectively ensuring the stable drying of the inkjet coating and improving the quality of the coating after drying.

[0025] like Figures 4-5 A flow advection assembly is provided between two adjacent UV curing lamps 4 and between the left air intake chamber 33 and the adjacent UV curing lamp 4. However, no flow advection assembly is provided between the UV curing lamp 4 and the right air intake chamber 32. The main reason for this is that the left air intake chamber 33 is located on the feeding side, where the inkjet coating on the substrate is unstable and the surface energy of the substrate is low. When the inkjet is subjected to excessive external force, it is easy to shift and become smudged. On the other hand, the right air intake chamber 32 is close to the discharge side, where the inkjet coating is about to be discharged from the drying chamber 31 and the coating is already curing. Therefore, the protection of the flow advection assembly is not required.

[0026] The advection assembly includes an upper guide plate 71 fixedly connected to one end of the UV curing lamp 4 near the left air intake 33, and a lower guide plate 72 fixedly connected to the outer end of the left air intake 33 or to the bottom of the UV curing lamp 4 away from the left air intake 33 via a connecting strip 701. The upper guide plate 71 and the lower guide plate 72 are parallel to each other and staggered. By setting the upper guide plate 71 and the lower guide plate 72 parallel to each other, the airflow resistance in the drying chamber 31 when it is near the space below the UV curing lamp 4 (the space above the substrate) can be effectively increased, so that the airflow tends to be gentle after reaching this place, and the airflow direction is effectively changed, forcing the airflow to pass horizontally above the substrate, thereby greatly reducing the interference of the airflow on the inkjet coating on the substrate surface and effectively preventing the coating from being blown away. Furthermore, under the protection of the substrate and the inkjet coating on it by the advection assembly, when the UV curing lamp 4 generates a lot of heat and the heat dissipation demand is high, the airflow of the axial fan 5 and the top centrifugal fan 61 can be increased to accelerate heat dissipation.

[0027] The lower end of the upper guide plate 71 is flush with the lower surface of the UV curing lamp 4, and the lower guide plate 72 is lower than the upper guide plate 71. The lower guide plate 72 and the bottom of the UV curing lamp 4 on the side away from the left air intake 33 do not coincide in the top view. This effectively ensures that the airflow blown out from the advection component is directed at the bottom of the UV curing lamp 4, thereby enabling targeted cooling of the bottom of the UV curing lamp 4 and improving the heat dissipation effect of the UV curing lamp 4.

[0028] The lengths of the lower guide plate 72 and the upper guide plate 71 are both greater than the width of the conveyor belt assembly 2, so that the gas after being guided has a certain gap with the substrate from the narrow ends of the two plates. When the airflow overflows from this point, it is not easy to affect the inkjet coating on the substrate.

[0029] Along the moving direction of the conveyor belt assembly 2, the overlap range of the upper guide plate 71 and the lower guide plate 72 in the multiple advection components becomes smaller and smaller in the top view angle, and the gap in the vertical direction becomes larger and larger. This setting is mainly to adapt to the inkjet coating tending to solidify along the moving direction of the conveyor belt assembly 2, and the stability gradually increases. Specifically, the upper guide plate 71 and the lower guide plate 72 in the advection component near the left air intake 33 have a larger overlap range and a smaller gap, which makes it generate greater resistance to the airflow, thereby making the airflow blown out at the advection component at this location smoother, adapting to the inkjet coating with poor stability, and protecting it from being blown away.

[0030] Second implementation method: Compared to the first embodiment, this embodiment adds a gap adjustment component, the details of which are as follows: Please see Figure 6 In this embodiment, the length of the lower guide plate 72 is greater than the length of the upper guide plate 71. Two adjustment assemblies are also provided on the advection assembly, located at the front and rear ends respectively. Each adjustment assembly includes a top plate 75 connected to the upper end of the upper guide plate 71 via a pad, an adjustment plate located at the upper end of the lower guide plate 72, and multiple temperature-sensing plates 74 fixedly connected between the adjustment plate and the top plate 75. A groove is formed at the upper end of the lower guide plate 72 on the side away from the left air intake 33. The adjustment plate is located within the groove and is fixedly connected to the side wall of the groove. The adjustment plate includes an air-blocking plate 732 and a pre-lift bar 731 fixedly connected to the multiple temperature-sensing plates 74. The temperature-sensing plates 74 are made of a two-way memory alloy material. Figures 7-8 As the temperature rises, multiple temperature sensing plates 74 gradually contract, thereby causing the pre-lift bar 731 to gradually rise and approach the upper guide plate 71. At the same time, the air baffle 732 extends, thereby intercepting the airflow and forcing the airflow to pass only through the narrowing gap between the upper guide plate 71 and the pre-lift bar 731. As the gap narrows, the resistance increases. At this time, the rotational speed of the axial flow fan 5 and the top centrifugal fan 61 can be adaptively increased.

[0031] In addition, the distance between the top plate 75 and the lower guide plate 72 is not less than twice the distance between the top plate 75 and the upper guide plate 71, which effectively ensures that the temperature sensing plate 74 has enough space to shorten after being heated. When the temperature rises to the highest critical temperature of the temperature sensing plate 74, the pre-lift bar 731 can rise to contact the upper guide plate 71, so that when the heat dissipation demand is very high, the gap between the upper guide plate 71 and the lower guide plate 72 can be completely eliminated, allowing the axial flow fan 5 and the top centrifugal fan 61 to rotate faster without affecting the inkjet coating, thus enhancing heat exchange.

[0032] Two guide rods 702 are fixedly connected between the bottom of the groove and the lower end of the upper guide plate 71. The guide rods 702 move through the pre-lift bar 731. The guide rods 702 are mainly used for guiding and limiting, so that the pre-lift bar 731 always remains parallel to the upper guide plate 71 when it moves up and down, so that the gap adjustment is relatively uniform.

[0033] The third implementation method: Compared to the first or second embodiment, this embodiment adds an angle adjustment function between the lower guide plate 72 and the upper guide plate 71, the details of which are as follows: When this implementation method is carried out based on the first implementation method (Case A): as follows: Figure 9 The lower guide plate 72 includes a horizontal section 721, a pre-bending section 722, and a pre-vertical section 723. The pre-bending section 722 is made of an elastic material, while the horizontal section 721 and the pre-vertical section 723 are made of rigid materials. The horizontal section 721 is arranged parallel to the upper guide plate 71, and the horizontal section 721 and the upper guide plate 71 partially overlap in a top view. This effectively ensures that when the airflow entering the horizontal flow assembly passes through the overlapping part, it can force the airflow to diffuse horizontally, so that the airflow is less likely to blow directly onto the inkjet coating.

[0034] like Figures 10-11 The horizontal section 721, the pre-bending section 722, and the pre-sag section 723 each have multiple corresponding and interconnecting mounting holes 801. Three interconnected mounting holes 801 form an adjustment hole. A metal wire 81 and a sensing spring 82 sleeved around the metal wire 81 are fixedly connected to the adjustment hole near the inner wall of the left air intake 33. The ends of the sensing springs 82 extend into the pre-sag section 723. Figure 11 Under normal temperature conditions, the sensing spring 82 is in a contracted state, and the length of the end of the sensing spring 82 within the pre-sag section 723 is no more than 1 / 4 of the length of the corresponding mounting hole 801. The mounting hole 801 within the pre-sag section 723 is a blind hole, and the metal wire 81 is fixedly connected to the radial inner wall of the blind hole. The metal wire 81 serves as a liner, which can improve the stability of the pre-sag section 723 and prevent it from sagging excessively.

[0035] like Figure 12In the figure, a1 and a2 represent the drooping angles of the pre-drooping section 723 under different pitches of the metal wire 81, respectively, where a1 < a2. When the UV curing lamp 4 generates severe heat, causing the temperature inside the drying chamber 31 to be too high, the sensing spring 82 gradually elongates at that temperature, and its pitch gradually increases, weakening its axial support force on the pre-drooping section 723. Under the weight of its own, the pre-drooping section 723 gradually bends downward. The higher the temperature, the larger the pitch of the sensing spring 82, and the weaker the support force, the greater the downward bending angle of the pre-drooping section 723. This allows the airflow entering through the gap at the parallel position of the upper guide plate 71 and the lower guide plate 72 to flow out at the drooping point of the pre-drooping section 723. Figure 13 This means that the airflow enters through a small inlet and exits through a large outlet, allowing for a wider airflow diffusion range. This, in turn, makes the airflow entering the substrate smoother, further reducing the impact of the airflow on the uncured inkjet coating.

[0036] When this implementation method is carried out based on the second implementation method (Case B): as follows: Figure 14 The horizontal section 721, the pre-bending section 722, and the pre-sag section 723 together form the pre-lifting bar 731. The connection between the multiple temperature sensing plates 74 and the pre-lifting bar 731 is located on the horizontal section 721. The pre-bending section 722 and the pre-sag section 723 do not contact the temperature sensing plates 74, and the pre-bending section 722 is located outside the end of the lower guide plate 72. The rest of the settings are consistent with those in case A.

[0037] The above description is merely a preferred embodiment of the present invention; it encompasses all the protection scope of the present invention. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in the present invention, based on the technical solutions and improved concepts of the present invention, should be covered within the protection scope of the present invention.

Claims

1. A low-temperature drying device for inkjet coating on low surface energy substrates, comprising a support (1), a conveyor belt assembly (2) mounted on the support (1), and a curing chamber (3) mounted on the upper middle part of the conveyor belt assembly (2), characterized in that: The curing chamber (3) includes a drying chamber (31) located in the middle, a left air inlet chamber (33) near the feeding side of the curing chamber (3), and a right air inlet chamber (32) near the discharging side of the curing chamber (3). The left air inlet chamber (33) and the right air inlet chamber (32) are both fixedly connected to the drying chamber (31). Multiple axial flow fans (5) are installed on the left air inlet chamber (33) and the right air inlet chamber (32). The multiple axial flow fans (5) penetrate the side wall of the drying chamber (31) and are interconnected with the interior of the drying chamber (31). The top of the drying chamber (31) is fixedly connected to a plurality of top centrifugal fans (61) and a top air guide hood (601). The air inlets of the plurality of top centrifugal fans (61) are connected to the top air guide hood (601). The lower end of the top air guide hood (601) is connected to the interior of the drying chamber (31). An exhaust hood (35) is also fixedly connected to the upper end of the drying chamber (31). An exhaust pipe (34) is fixedly connected to the upper end of the left air intake chamber (33). The plurality of top centrifugal fans (61) are located inside the left air intake chamber (33). The right air intake chamber (32) is also fixedly installed with a lower centrifugal fan (62) and a lower air guide hood (602). An air guide pipe (301) is fixedly connected between the upper end of the right air intake chamber (32) and the exhaust pipe (34). The air inlet and exhaust outlet of the lower centrifugal fan (62) are respectively connected to the lower air guide hood (602) and the air guide pipe (301). Two frame plates (101) are also fixedly connected to the middle of the upper end of the bracket (1). A perforated bearing plate (102) is fixedly connected between the two frame plates (101). The porous support plate (102) is located inside the belt body of the conveyor belt assembly (2), and the upper end of the porous support plate (102) is in contact with the lower end of the belt body. The upper end of the frame (101) near the lower centrifugal fan (62) and the end near the porous support plate (102) are respectively provided with an upper air guide hole (302) and a side air guide hole (303). The side air guide hole (303) communicates with the interior of the porous support plate (102), and both the upper air guide hole (302) and the side air guide hole (303) communicate with the interior of the frame (101). The drying chamber (31) is fixedly connected to two support rods (401). Multiple UV curing lamps (4) are installed at the lower ends of the two support rods (401) through multiple connecting rods. Advection components are provided between two adjacent UV curing lamps (4) and between the left air intake chamber (33) and the adjacent UV curing lamps (4). The advection components include an upper guide plate (71) fixedly connected to the end of the UV curing lamp (4) near the left air intake chamber (33) and a lower guide plate (72) fixedly connected to the outer end of the left air intake chamber (33) or to the bottom of the UV curing lamp (4) away from the left air intake chamber (33) through a connecting strip (701). The upper guide plate (71) and the lower guide plate (72) are parallel to each other and staggered.

2. The low-temperature drying equipment for inkjet coating on low surface energy substrates according to claim 1, characterized in that: The lower end of the upper guide plate (71) is flush with the lower surface of the UV curing lamp (4), the lower guide plate (72) is lower than the upper guide plate (71), and the bottom of the lower guide plate (72) and the UV curing lamp (4) on the side away from the left air intake (33) do not coincide in the top view.

3. The low-temperature drying equipment for inkjet coating on low surface energy substrates according to claim 2, characterized in that: Along the moving direction of the conveyor belt assembly (2), the overlap range of the upper guide plate (71) and the lower guide plate (72) in the multiple horizontal flow assemblies becomes smaller and smaller in the top view angle, and the gap in the vertical direction becomes larger and larger.

4. The low-temperature drying equipment for inkjet coating on low surface energy substrates according to claim 3, characterized in that: The advection assembly is also provided with two gap adjustment assemblies. The two gap adjustment assemblies are located at the front and rear ends of the upper guide plate (71) respectively. The gap adjustment assembly includes a top plate (75) connected above the end of the upper guide plate (71) by a pad block, a gap adjustment plate located at the upper end of the lower guide plate (72), and multiple temperature sensing plates (74) fixedly connected between the gap adjustment plate and the top plate (75). The lower guide plate (72) has a groove on the upper end of the side away from the left air intake (33). The gap adjustment plate is located in the groove and is fixedly connected to the side wall of the groove.

5. The low-temperature drying equipment for inkjet coating on low surface energy substrates according to claim 4, characterized in that: The adjusting plate includes an air baffle (732) and a pre-lift bar (731) fixedly connected to multiple temperature sensing plates (74). The temperature sensing plates (74) are made of double-pass memory alloy material, and the distance between the top plate (75) and the lower guide plate (72) is not less than twice the distance between the top plate (75) and the upper guide plate (71).

6. The low-temperature drying equipment for inkjet coating on low surface energy substrates according to claim 4, characterized in that: Two guide rods (702) are fixedly connected between the bottom of the groove and the lower end of the upper guide plate (71), and the guide rods (702) movably pass through the pre-lift bar (731).

7. A low-temperature drying apparatus for inkjet coating on low surface energy substrates according to claim 3 or 5, characterized in that: The lower guide plate (72) includes a horizontal section (721), a pre-bending section (722) and a pre-vertical section (723). The pre-bending section (722) is made of an elastic material, while the horizontal section (721) and the pre-vertical section (723) are both made of rigid materials. The horizontal section (721) is arranged parallel to the upper guide plate (71).

8. The low-temperature drying equipment for inkjet coating on low surface energy substrates according to claim 7, characterized in that: The horizontal section (721), the pre-bending section (722), and the pre-vertical section (723) are each provided with a number of corresponding and interconnected mounting holes (801). The three interconnected mounting holes (801) form an adjustment hole. The adjustment hole is fixedly connected to the inner wall of the left air intake (33) with a metal wire (81) and a sensing spring (82) sleeved on the outside of the metal wire (81). The ends of the sensing springs (82) extend into the pre-vertical section (723).

9. A low-temperature drying apparatus for inkjet coating on low surface energy substrates according to claim 8, characterized in that: At room temperature, the sensing spring (82) is in a contracted state, and the length of the end of the sensing spring (82) in the pre-sag section (723) is no more than 1 / 4 of the length of the corresponding mounting hole (801). The mounting hole (801) in the pre-sag section (723) is a blind hole, and the metal wire (81) is fixedly connected to the radial inner wall of the blind hole.

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