An efficient drying device for spraying printing media

Abstract

The present invention discloses an efficient drying device for spraying printing media, which includes a device frame body, a drying device and a main control unit. The main control unit includes a controller and a control panel. The drying device includes a drying box, a heat preservation structure and a circulating air drying system provided on the device frame body. The circulating air drying system is provided with a temperature measuring unit. The drying box is provided with a feeding channel. The circulating air drying system is arranged on one side of the feeding channel, and a ventilation isolation member is arranged between the circulating air drying system and the feeding channel. The present invention not only avoids the heat energy loss caused by heat dissipation during the hot air drying process, improves the utilization rate of heat energy, but also can accurately control the drying temperature, provides different hot air temperatures for different materials and printing ink amounts, and improves the product qualification rate.

Description

Technical Field

[0001] The present invention relates to the technical field of drying of spray printing media, and particularly to an efficient drying device for spray printing media. Background Art

[0002] The drying equipment for inkjet printing materials is the core post-processing device in the digital printing production chain, mainly used to accelerate the curing process of solvent-based, UV-based or water-based inks. Through the combination of technologies such as hot air circulation, infrared radiation, and ultraviolet curing, and in cooperation with the temperature control system, conveyor belt mechanism and intelligent monitoring module, it realizes the directional drying of inkjet products made of different materials such as light cloth, PVC film, and vehicle body stickers. Modern high-end models usually adopt a partitioned temperature control design, which can automatically adjust the working range of 30-120°C according to the material thickness and ink characteristics, and are equipped with a device with adjustable wind speed to avoid material curling. Some equipment also integrates a VOCs waste gas treatment system to meet environmental protection requirements. [[ID=<<MASK_0>>]]

[0003] In the inkjet process, the necessity of the drying equipment is mainly reflected in three aspects: First, insufficiently cured ink will lead to a decrease in color saturation, edge bleeding and insufficient adhesion, directly affecting the weather resistance and display period of outdoor advertisements; Second, uneven heating of flexible materials is likely to cause deformation and wrinkles, and professional drying equipment can maintain the flatness of the materials through a balanced heat field; Third, efficient drying (usually the drying time needs to be compressed to 5-30s) is the key to ensuring continuous operation of the production line, directly affecting the daily production capacity of the enterprise. Especially in the multi-color overprint process, drying layer by layer can avoid color penetration and ensure that the image accuracy reaches the industrial standard of more than 720 dpi.

[0004] The Chinese patent with the application number "2018112780055" discloses a double-sided printing and drying device for woven satin ribbons. The drying mechanism of this technical solution has a large drying range and a long drying time, and can effectively dry the ink on the woven satin ribbons to avoid bleeding; The Chinese patent with the application number "2019220898275" discloses a vertical drying device for a double-sided flag printer. This device can meet the requirement of drying both sides of the fabric of a double-sided flag printer, and the fabric is heated evenly; The above-mentioned existing hot air drying equipment are all designed with an open structure, with insufficient thermal efficiency and a temperature control deviation of ±5°C at the air outlet. Not only is the penetration power weak, but when processing thickened materials, the surface is likely to dry while the inside is still wet, resulting in a decrease in the qualified rate of finished products. Moreover, the heat loss caused brings low heat utilization rate and climbs the energy consumption cost.

[0005] The Chinese patent with the application number "2024110952777" discloses a three-dimensional painting spraying and printing device. This device conveys the hot air blown by a fan to the interior between two protective covers through two hoses to dry the spraying and printing on the substrate. The drying device of this device has prominent design problems of current traditional hot air drying equipment, with insufficient intelligence. Moreover, more than 70% of the mid-range devices among the current mainstream drying equipment on the market lack online humidity monitoring and still rely on experience to set parameters, resulting in a material over-drying rate exceeding 12% and a high non-conforming rate. Summary of the Invention

[0006] The purpose of the present invention is to provide an efficient drying equipment for spraying printing media, which not only avoids heat energy loss caused by heat dissipation during the hot air drying process, improves the utilization rate of heat energy, but also can accurately control the drying temperature, provide different hot air temperatures for different materials and printing ink amounts, and improve the product qualification rate to solve the problems in the prior art.

[0007] To achieve the above purpose, the present invention is implemented by adopting the following technical solutions:

[0008] An efficient drying equipment for spraying printing media, including an equipment frame, a drying device provided on the equipment frame, and a main control unit. The main control unit includes a controller and a control panel electrically connected to the controller. The drying device includes a drying box provided on the equipment frame, a heat preservation structure provided on the drying box, and a circulating air drying system provided in the drying box. The circulating air drying system is electrically connected to the controller. The circulating air drying system is provided with a temperature measuring unit, and the temperature measuring unit is electrically connected to the controller. The drying box is provided with a feeding channel, and the feeding channel penetrates through the drying box. The circulating air drying system is provided on one side of the feeding channel, and a ventilation isolation member is provided between the circulating air drying system and the feeding channel.

[0009] Furthermore, the circulating air drying system includes a duct plate member provided in the drying box, a plurality of air circulation units provided on the duct plate member, and a plurality of heating units provided at positions corresponding to the air circulation units on the duct plate member. Air supply holes are opened at the installation positions corresponding to the air circulation units on the duct plate member, and a plurality of circulating air holes are opened at one end of the duct plate member far from the air circulation units. Both the air circulation units and the heating units are electrically connected to the controller.

[0010] Still further, the temperature measuring unit is provided at both ends of the heating unit. The temperature measuring unit is a temperature detection sensor, and the temperature detection sensor is electrically connected to the controller.

[0011] Further, the installation positions of the air circulation units are divided into left and right groups along the feeding direction and are alternately distributed on the air duct plate member. A heating unit is installed on one side of the air duct plate member close to the ventilation isolation member, and an air circulation unit is installed on the side of the air duct plate member far from the ventilation isolation member.

[0012] Further, a rotational speed monitoring device is provided at the installation position of the air circulation unit, and the rotational speed monitoring device is electrically connected to the controller.

[0013] Further, the drying oven includes a protective baffle, two connecting plates provided on both sides of the protective baffle, and a rear baffle disposed opposite to the protective baffle. A heat-insulating support shell is provided between the connecting plates, and a protective cover perforated plate is provided outside the protective baffle for buffering the impact force of other objects on the protective baffle.

[0014] Still further, the heat-insulating structure includes a wide-body heat-insulating shell, heat-insulating partition plates provided on both sides of the wide-body heat-insulating shell, and a rear heat-insulating plate provided outside the rear baffle. The wide-body heat-insulating shell is provided between the protective baffle and the heat-insulating support shell, and each heat-insulating partition plate is provided outside the connecting plate on the corresponding side.

[0015] Further, a guiding mechanism is provided at a position close to the feed inlet in the feeding channel. A hot air baffle is provided at the feed inlet of the feeding channel. A drain pipe is connected to the connecting plate on one side of the hot air baffle. The horizontal position of the drain pipe is lower than the position of the hot air baffle, and the horizontal position of the guiding mechanism is lower than the position of the hot air baffle.

[0016] Further, a base paper peeling shaft is provided below the drying oven for changing the conveying direction of the drying medium.

[0017] Further, a winding device is provided at a position on the equipment frame body close to the discharge outlet of the drying oven. The winding device includes a fixed roller device provided on one side of the equipment frame body, a slide rail horizontally provided on the equipment frame body, and a sliding roller slidably connected to the slide rail.

[0018] The beneficial effects of the present invention are as follows: By installing a semi-enclosed drying oven with a heat-insulating structure, the present invention avoids heat dissipation during the hot air drying process, improves the heat energy utilization rate, and ensures the temperature consistency in the drying oven through the circulating air drying system, achieving the effects of overall drying and the same drying effect. At the same time, a temperature measuring unit is provided on the circulating air drying system. The controller accurately controls the drying temperature of the circulating air drying system through the signal feedback of the temperature measuring unit, and can provide different hot air temperatures for different materials and printing ink amounts. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a flowchart of the control unit provided by the present invention;

[0020] Figure 2Stereogram of the high-efficiency drying equipment provided by the present invention;

[0021] Figure 3 Front view of the circulating air drying system provided by the present invention;

[0022] Figure 4 For Figure 3 Partial sectional view taken along line A-A in

[0023] Figure 5 Explosion structure diagram of the circulating air drying system provided by the present invention;

[0024] Figure 6 Side view explosion diagram of the circulating air drying system provided by the present invention.

[0025] Description of the markings in the figure: 100, equipment frame; 110, universal wheels; 120, support adjustment seat; 200, control panel; 300, drying box; 310, air duct plate member; 311, air supply hole; 312, circulating air hole; 320, air circulation unit; 330, heating unit; 340, protective baffle; 350, connecting plate; 351, drain pipe; 360, rear baffle; 370, hot air baffle; 380, base paper film peeling shaft; 390, ventilation isolation member; 400, temperature measurement unit; 500, heat preservation support shell; 600, protective cover perforated plate; 710, wide-body heat preservation shell; 720, heat preservation partition; 730, heat preservation board; 800, guiding mechanism; 900, winding device; 910, fixed roller device; 920, slide rail; 930, sliding roller. Detailed implementation manners

[0026] To make the above objects, features and advantages of the present invention more obvious and understandable, the following will describe the detailed implementation manners of the present invention with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific implementations disclosed below.

[0027] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0028] The embodiments are as follows:

[0029] As Figure 2 、Figure 3 An efficient drying device for spraying printing media is shown, including a device frame 100, a drying device provided on the device frame 100, and a main control unit. Among them, four universal wheels 110 and four support adjustment seats 120 are installed below the device frame 100. The support adjustment seats 120 are preferably adjustable feet. According to the device site plan, the universal wheels 110 and the support adjustment seats 120 facilitate the movement and placement of the drying device. The main control unit includes a controller and a control panel 200 electrically connected to the controller. The main chip of the controller is a programmable MCU with the model STSPIN32F0, and the control panel 200 is a capacitive touch screen with the model ClearPad 7300. The drying device includes a drying box 300 provided on the device frame 100, a heat preservation structure installed on the drying box 300 through fasteners, and a circulating air drying system installed in the drying box 300 through bolt fasteners. The circulating air drying system is electrically connected to the controller. The circulating air drying system is provided with a temperature measuring unit 400, and the temperature measuring unit 400 is electrically connected to the controller. The temperature measuring unit 400 is provided at both ends of the heating unit 330.

[0030] As a technical solution of this embodiment, further, as Figure 5 shown, the circulating air drying system includes a duct plate member 310 provided in the drying box 300, four air circulation units 320 provided on the duct plate member 310, and four heating units 330 provided at positions corresponding to the air circulation units 320 on the duct plate member 310. The four heating units 330 are installed on the duct plate member 310 through mounting frames. Four air supply holes 311 are opened at the installation positions of the duct plate member 310 corresponding to the air circulation units 320. A number of circulating air holes 312 are opened in the upper half of the duct plate member 310. The circulating air holes 312 are arranged in an array in the upper part of the duct plate member 310. Both the air circulation units 320 and the heating units 330 are electrically connected to the controller.

[0031] Among them, the four air circulation units 320 are all cross-flow fan structures of the same model. The air outlets of the air circulation units 320 are all provided at the corresponding air supply holes 311. The air supply holes 311 are all strip-shaped structures and are adapted to the air outlets of the air circulation units 320. The four heating units 330 are all PTC heating element structures of the same model. Each PTC heating element is a single-strip heating structure. The installation position of each heating unit 330 is provided on the air supply hole 311 and is arranged opposite to the air outlet of the air circulation unit 320. A temperature measuring unit 400 is also installed on the mounting frames at both ends of the heating unit 330. The installation position of the temperature measuring unit 400 is close to the ventilation isolation member 390.

[0032] Specifically, as Figure 4 、 Figure 5 、 Figure 6The drying oven 300 shown includes a protective baffle 340, two connecting plates 350 provided on both sides of the protective baffle 340, and a rear baffle 360 disposed opposite to the protective baffle 340. A heat-insulating support shell 500 is provided between the connecting plates 350. A protective cover perforated plate 600 is provided outside the protective baffle 340 for buffering the impact force of other objects on the protective baffle 340. The heat-insulating structure includes a wide-body heat-insulating shell 710, heat-insulating partition plates 720 provided on both sides of the wide-body heat-insulating shell 710, and a rear heat-insulating plate 730 provided outside the rear baffle 360. The wide-body heat-insulating shell 710 is provided between the protective baffle 340 and the heat-insulating support shell 500, and each heat-insulating partition plate 720 is provided outside the connecting plate 350 on the corresponding side. Among them, the heat-insulating materials of the wide-body heat-insulating shell 710, the heat-insulating partition plates 720, and the rear heat-insulating plate 730 are polyurethane (PUR / PIR) foam boards. The temperature measurement unit 400 is a temperature sensor of a K-type thermocouple, and PT100 and NTC temperature measurement elements can also be selected according to customized requirements. The temperature measurement unit 400 is electrically connected to the controller. The drying oven 300 has a feeding channel from top to bottom for the printing medium to pass through and perform drying operations. This drying equipment is placed at the discharge end of a large-scale inkjet printing equipment. Adjust the support adjustment seat 120 to introduce the leading end of the printing medium into the feeding channel. Therefore, compared with the existing printing and drying equipment, the drying equipment of the present application can be used in combination with various models of large-scale inkjet printing equipment. The feeding channel penetrates through the drying oven 300. A circulating air drying system is provided on one side of the feeding channel, and a ventilation isolation member 390 is provided between the circulating air drying system and the feeding channel. In this embodiment, the ventilation isolation member 390 is preferably a metal mesh. The installation positions of the air circulation units 320 are divided into left and right groups along the feeding direction, and the two groups of air circulation units 320 are alternately distributed on the air duct plate member 310 to avoid deformation and wrinkles of the flexible material caused by uneven heating.

[0033] In addition, as <> Figure 4On one side of the shown air duct plate member 310 close to the ventilation isolation member 390, a heating unit 330 is installed. On the side of the air duct plate member 310 far from the ventilation isolation member 390, an air circulation unit 320 is installed. The blowing direction of the air circulation unit 320 forms an angle greater than 90° with the feeding channel. The airflows generated by the four air circulation units 320 respectively pass through the corresponding heating units 330 to form high-temperature airflows. The high-temperature airflows enter the feeding channel through the ventilation isolation member 390 and act on the printing medium to dry the printing medium. After the air circulation unit 320 is started, a negative pressure space is formed inside the heat preservation support shell 500, and a high-pressure space is formed in the feeding channel. Therefore, the hot airflows in the feeding channel dry the printing medium, and the airflow temperature decreases. The low-temperature airflows enter the space inside the heat preservation support shell 500 through several circulating air holes 312 in the upper part of the air duct plate member 310. The low-temperature airflows are pumped by the air circulation unit 320 to the heating unit 330 to be heated to form high-temperature airflows and continue to dry the printing medium. Furthermore, the four air circulation units 320 cooperate with the corresponding heating units 330. The air circulation unit 320 can form a multi-region hot air circulation in the cavity of the drying box 300, promoting the uniform distribution of the dried area of the printing medium and avoiding insufficient curing of some inks, which will lead to a decrease in color saturation, edge bleeding, and insufficient adhesion, directly affecting the weather resistance and display period of outdoor advertisements. At the same time, it can quickly dry the printing medium.

[0034] For existing printing and drying equipment, according to the material thickness and the usage scenario of the printing medium, the working temperature required for drying the printing medium is 50°C to 120°C. The drying temperature of this equipment is set by the controller into four levels: low ink volume temperature LT, medium ink volume temperature MT, high ink volume temperature HT, and ultra-high ink volume temperature UT, and the corresponding temperatures are 70°C, 80°C, 90°C, and 100°C respectively. The setting standard is the ink coverage rate Lc of the printing medium. Among them,

[0035] Printing media with an ink coverage rate of Lc ≤ 20% are dried at LT.

[0036] Printing media with an ink coverage rate of 20% < Lc ≤ 50% are dried at MT.

[0037] Printing media with an ink coverage rate of 50% < Lc ≤ 80% are dried at HT.

[0038] Printing media with an ink coverage rate of 80% < Lc are dried at UT.

[0039] During the actual equipment assembly process, according to the supporting printing equipment, the printing and drying requirements, and the specific structure of the drying equipment, the air circulation unit 320 can select an axial flow fan and a turbine fan, and the heating unit 330 can select a stainless steel heating tube, an infrared quartz heating tube, and an alloy electric furnace wire heating element.

[0040] The heating unit 330 of the drying device is electrically connected to the controller through a heating unit driver. The heating unit driver is a semiconductor switching device such as MOSFET or IGBT. Before the drying operation starts, the drying temperature required for the corresponding level is set through the control panel 200. The temperature measuring unit 400 of the controller sends a pulse signal of the temperature in the feeding channel to the controller in real time. The controller performs comparison calculations. The main chip directly drives MOSFET (low voltage) or IGBT (high voltage) through PWM (pulse width modulation) signals or PID control algorithms to control the on-off of the current of the heating unit 330, thereby more precisely controlling the drying temperature of the printing medium at each level. On the premise of saving energy and improving thermal energy efficiency, the over-drying rate of the printing medium is reduced, thereby improving the product qualification rate.

[0041] As a technical solution of this embodiment, further, as Figure 4 shown, a rotation speed monitoring device is provided at the installation position of the air circulation unit 320. The rotation speed monitoring device is a photoelectric sensor with the model EE-SPY402. The rotation speed monitoring device is electrically connected to the controller. There is a fan unit driver electrically connected between the controller and the air circulation unit 320. The photoelectric sensor sends the pulse signal of the monitored rotation speed to the controller. The controller sends an instruction to the fan unit driver through data information comparison to control the rotation speed of each air circulation unit 320, that is, the cross-flow fan. When the front end of the printing medium enters the feeding channel, to avoid problems such as curling or poor feeding of the printing medium affected by the hot air, the controller controls the air circulation unit 320 to operate at a low rotation speed, with a rotation speed of 800 ± 50 RPM; if the front end of the printing medium passes through the feeding channel of the drying oven 300 and the drying operation officially starts, the controller controls the air circulation unit 320 to operate at a high rotation speed, with a rotation speed of 4000 ± 500 RPM.

[0042] As a technical solution of this embodiment, further, as Figure 2 、 Figure 4 shown, a guiding mechanism 800 is provided near the feeding port in the feeding channel. A hot air baffle 370 is provided at the feeding port of the feeding channel. The hot air baffle 370 can block the heat energy airflow conveyed by the air circulation unit 320 from escaping outside the feeding port, playing a role in guiding the airflow to turn and making the hot air circulation more stable. To prevent the waste steam evaporated by the ink drying from escaping into the air and affecting the health of the staff, a drain pipe 351 is connected to the connecting plate 350 on one side of the hot air baffle 370. The horizontal position of the drain pipe 351 is lower than the position of the hot air baffle 370. The water outlet end of the drain pipe 351 is connected to an external water collection assembly, which is convenient for treating and discharging the harmful wastewater. The horizontal position of the guiding mechanism 800 is lower than the position of the hot air baffle 370.

[0043] As a technical solution of this embodiment, further, as Figure 2 、Figure 4 and Figure 5 A base paper peeling shaft 380 is provided below the drying oven 300 shown in Figure 5 for changing the conveying direction of the drying medium. Moreover, a winding device 900 is provided at a position on the equipment frame 100 close to the discharge port of the drying oven 300. The winding device 900 includes a fixed roller device 910 provided on one side of the equipment frame 100, a slide rail 920 horizontally provided on the equipment frame 100, and a sliding roller 930 slidably connected to the slide rail 920. A limit pin is provided on the slide seat of the sliding roller 930. According to the width of the printing medium, the relative position of the sliding roller 930 on the slide rail 920 and the fixed roller device 910 is moved. The specific structure of the winding device 900 refers to the double-power paper collector disclosed in the application number "2015211394168".

[0044] The above has shown and described the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention, and any reference signs in the claims should not be regarded as limiting the claims involved.

[0045] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An efficient drying device for spraying printing media, comprising a device frame, a drying device mounted on the device frame, and a main control unit, characterized in that: The main control unit includes a controller and a control panel electrically connected to the controller. The drying device includes a drying box provided on the equipment frame, a heat preservation structure provided on the drying box, and a circulating air drying system provided in the drying box. The circulating air drying system is electrically connected to the controller. The circulating air drying system is provided with a temperature measuring unit, which is electrically connected to the controller. The drying box is provided with a feeding channel, which passes through the drying box. The circulating air drying system is provided on one side of the feeding channel, and a ventilation isolation member is provided between the circulating air drying system and the feeding channel. The circulating air drying system includes an air duct plate arranged in a drying box, a plurality of air circulation units arranged on the air duct plate, and a plurality of heating units arranged at positions of the air duct plate corresponding to the air circulation units. The air duct plate is provided with air supply holes at installation positions corresponding to the air circulation units, and a plurality of circulating air holes are provided at one end of the air duct plate away from the air circulation units. The air circulation units and the heating units are both electrically connected to a controller. The temperature measuring unit is provided at both ends of the heating unit. The temperature measuring unit is a temperature detection sensor, and the temperature detection sensor is electrically connected to the controller; The installation positions of the air circulation unit are divided into two groups, left and right, along the feeding direction and are alternately distributed on the air duct plate. The heating unit is installed on the side of the air duct plate close to the ventilation isolation piece, and the air circulation unit is installed on the side of the air duct plate away from the ventilation isolation piece. The drying box includes a protective baffle, two connecting plates arranged on both sides of the protective baffle, and a rear baffle arranged opposite to the protective baffle. A heat-insulating support shell is provided between the connecting plates. A protective cover perforated plate is provided on the outer side of the protective baffle to cushion the impact of other objects on the protective baffle. The insulation structure includes a wide insulation shell, insulation partitions provided on both sides of the wide insulation shell, and a rear insulation plate provided on the outside of the rear baffle. The wide insulation shell is provided between the protective baffle and the insulation support shell, and each insulation partition is provided on the outside of the connecting plate on the corresponding side. A guiding mechanism is provided in the feeding channel near the feed port, and a hot air baffle is provided at the feed port of the feeding channel. A drain pipe is connected to the connecting plate on one side of the hot air baffle. The horizontal position of the drain pipe is lower than that of the hot air baffle, and the horizontal position of the guiding mechanism is lower than that of the hot air baffle.

2. The high-efficiency drying device for spray-printed media according to claim 1, characterized in that: The installation position of the air circulation unit is provided with a speed monitoring device, and the speed monitoring device is electrically connected to the controller.

3. The high-efficiency drying device for spray-printed media according to claim 1, characterized in that: A bottom paper peeling shaft is provided below the drying box to change the conveying direction of the drying medium.

4. The high-efficiency drying device for spray-printed media according to claim 1, characterized in that: A winding device is provided on the equipment frame near the drying box discharge port, and the winding device includes a fixed roller device provided on one side of the equipment frame, a slide rail provided transversely on the equipment frame, and a sliding roller slidably connected to the slide rail.

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