A gas infrared radiation hot air dual-mode drying furnace for drying printing ink

Abstract

The present invention discloses a gas infrared radiation and hot air dual-mode drying furnace for drying printing inks, which comprises a furnace body housing. Inside the furnace body housing, there are a heating chamber and two machine position chambers. The two machine position chambers are symmetrically distributed at the top and bottom of the heating chamber. An inlet and an outlet penetrating through the furnace body housing are respectively arranged on both sides of the middle of the heating chamber. The present invention heats printing paper through two modes of gas infrared radiation and hot air. Due to the physical properties that infrared rays can penetrate and objects can actively absorb the heat of infrared rays, the ink and the interior of the paper can be quickly heated. In the later stage, the high-temperature flue gas waste gas generated by the front-end gas infrared radiation burner is used, and is guided to the air knife for drying through the hot air circulation mode by a blower and a forced air blower. The gas consumption of the burner is lower, and the heating speed is faster, further reducing the gas energy consumption. Under the condition of the same gas consumption, the speed of the printing press is significantly increased, meeting the requirement of lower gas energy consumption of existing conventional gas burners.

Description

Technical Field

[0001] The invention relates to the technical field of printing, in particular to a gas-fired infrared radiation hot air double-mode drying furnace for drying printing ink. Background Art

[0002] In the printing industry, if the ink is not dried in a drying oven after being printed on paper, the ink will spread on the paper, causing problems such as substandard product quality, blurred handwriting, dull colors, and dirty images. Using natural drying will reduce the printing speed of the printing press, so a printing drying oven is needed to dry the printed paper.

[0003] The existing printing drying furnaces have electric heating and gas heating. The electricity consumption cost of electric heating is 2-3 times higher than that of gas. The cost of using electric heating is calculated as follows: industrial electricity costs 0.8 yuan per kilowatt-hour, and the cost of natural gas is 3.5 yuan per cubic meter. The calorific value of natural gas is 8600 kcal per cubic meter, which is equivalent to about 10KW of electric power. In this way, the cost of natural gas for every 1KW of power is 0.35 yuan. 0.8 yuan per kilowatt-hour of electricity is 0.45 yuan higher than natural gas for the same heating of 1KW power. Therefore, electric drying furnaces are only chosen by some customers who do not care about energy consumption or where there is no natural gas or other gas supply in the local area.

[0004] The gas drying furnace uses a gas burner to burn and heat the air, and the hot air heats the paper to dry it. The existing gas drying furnace is equipped with two gas burners, each with a power of 250,000 kcal, a total power of 500,000 kcal, and a drying oven of 6 meters long. Conventional burners need to use hot air to conduct a large amount of hot air in the furnace, and a large amount of pollutant gases containing volatile VOCs will be generated when drying the ink. Therefore, a 200,000 kcal duct burner is designed to be installed inside the duct exhaust, and the VOC gas generated in the furnace is again passed through the high-temperature flame of the duct burner to crack it at high temperature. At present, the drying furnaces used in this industry are second-hand imported equipment from abroad. Due to the confidentiality of the electronic control program and core parameters, the motor operating parameters above cannot be adjusted by frequency conversion, and the temperature of the drying furnace controlled by the burner cannot be set arbitrarily. Even if the energy consumption is high, the parameters cannot be changed at will.

[0005] Therefore, it is necessary to research and develop a gas-fired infrared radiation hot air dual-mode drying furnace for drying printing ink to solve the above problems. Summary of the invention

[0006] The object of the present invention is to provide a gas infrared radiation hot air dual-mode drying furnace for drying printing inks, aiming at the problems existing in the prior art. By heating the printing paper through two modes of gas infrared radiation and hot air, and cooperating with a PID controller intelligent temperature control instrument, automatic constant temperature control can be achieved, enabling the temperature to be adjusted arbitrarily. Through the adjustment of the manual control mode and the automatic control mode, not only can the combustion be more sufficient and stable, saving fuel while also keeping the feeding channel at a constant temperature; while meeting the actual drying needs, it can reduce energy consumption and the potential damage to the paper.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A gas infrared radiation hot air dual-mode drying furnace for drying printing inks, including a furnace body casing. Inside the furnace body casing, there is a heating chamber and two machine position chambers. The two machine position chambers are symmetrically distributed at the top and bottom of the heating chamber. On both sides of the middle part of the heating chamber, there are an inlet and an outlet passing through the furnace body casing respectively, and the heating chamber forms a feeding channel between the inlet and the outlet for the printing paper to pass through. At the front end of the machine position chamber and the corresponding heating chamber, a primary drying mechanism is jointly provided. At the rear end of the machine position chamber and the corresponding heating chamber, a secondary drying mechanism is jointly provided;

[0009] A wind duct is installed inside the machine position chamber, and a blower is provided on the side wall of the wind duct corresponding to the front end of the machine position chamber;

[0010] The primary drying mechanism includes a linear burner and a far-infrared radiator. The linear burner is used to burn gas to heat the air inside the furnace body casing, and the far-infrared radiator is installed at the end of the linear burner;

[0011] The secondary drying mechanism includes a blower and an air knife. The blower is installed at the position on the side wall of the wind duct corresponding to the front end of the machine position chamber. Its input end and the output end of the blower are both connected to the wind duct, and the blowing directions of the blower and the blower are opposite, so that the hot air produced by the primary drying mechanism is pumped to the rear end of the heating chamber. The output end of the blower is connected to the air knife through an air supply pipe. The air knife is suspended in the heating chamber and symmetrically distributed on both sides of the feeding channel;

[0012] A gas valve group is provided at the input end of the linear burner for adjusting the drying environment inside the heating chamber.

[0013] Preferably, the gas valve group includes:

[0014] A DN40 gas branch pipe, inside which there is a first pressure gauge, a first solenoid valve and a gas flow regulating valve. The first pressure gauge is used to test and display the pressure value of the gas inside the DN40 gas branch pipe. The first solenoid valve is used to control the opening / closing of the DN40 gas branch pipe. The gas flow regulating valve is used to control the gas flow;

[0015] An air supply pipe is internally provided with a second pressure gauge and a second solenoid valve. The second pressure gauge is used to test and display the pressure value of the air inside the air supply pipe, and the second solenoid valve is used to control the on / off of the air supply pipe. An air pump is arranged at the output end of the air supply pipe for pumping air into the air supply pipe;

[0016] A premixer is used to pre-mix gas and air in proportion. The number of premixers is set to be multiple. One ends of the multiple premixers are distributed in a linear array and connected to the air supply pipe. The other ends of the premixers extend to the input ends of the corresponding linear burners. A third solenoid valve is arranged at the connection between the premixer and the input end of the linear burner. Each premixer is connected to the DN40 gas branch pipe through an air supply pipe. A BVM valve is arranged inside the premixer for adjusting and mixing gas and air;

[0017] Preferably, frequency converters are arranged at the connection ends of the blower and the air blower for controlling the air supply efficiency of the blower and the air blower;

[0018] A temperature sensor is arranged inside the front end of the heating chamber for sensing the temperature at the material feeding channel;

[0019] Flow meters are arranged inside both the DN40 gas branch pipe and the air supply pipe respectively for measuring the flow rates of gas and combustion-supporting air;

[0020] A pressure reducing valve is arranged inside the premixer for reducing the relatively high pressure from the gas source to the pressure range required for the normal operation of the linear burner;

[0021] A pressure switch is arranged inside the input end of the linear burner for monitoring and controlling the pressure of the mixed fluid.

[0022] Preferably, a PID controller is arranged on one side of the gas valve group. An A / D converter and a D / A converter are respectively arranged at the input end and the output end of the PID controller. The temperature sensor, the flow meter, the first pressure gauge, the second pressure gauge and the pressure switch are all electrically connected to the A / D converter. The first solenoid valve, the gas flow regulating valve, the second solenoid valve, the third solenoid valve, the BVM valve, the frequency converters of the blower and the air blower, and the pressure reducing valve are all electrically connected to the D / A converter.

[0023] Preferably, ball valves are installed at both the inlet and the outlet of the DN40 gas branch pipe;

[0024] A manual flow regulating valve is arranged on the air supply pipe for regulating the flow rate of gas or combustion-supporting air.

[0025] Preferably, filters are arranged inside both the DN40 gas branch pipe and the air supply pipe for filtering impurities in the gas and the combustion-supporting air.

[0026] Preferably, a partition board is arranged between the heating bin and the machine position bin, and the partition board is fixedly connected to the inner wall of the furnace body casing. The air supply pipe and the pipeline at the input end of the linear burner penetrate through the partition board and are in interference fit with the through hole.

[0027] Preferably, a protective net is arranged between the front end of the heating bin and between the far-infrared radiator and the feeding channel, and a flow dividing plate is arranged between the rear end of the heating bin and between the air knife and the feeding channel.

[0028] Preferably, multiple groups of primary drying mechanisms are provided, and the multiple groups of primary drying mechanisms are axially symmetrically distributed in two machine position bins;

[0029] The number of the blowers matches the number of the primary drying mechanisms, and the multiple linear burners of the primary drying mechanisms share one exhaust pipe, and the input end of the blower is butted against the corresponding exhaust pipe;

[0030] Multiple DN40 gas branch pipes are all connected to the DN40 gas main pipe, and the DN40 gas main pipe is communicated with an external gas source through a high-pressure pump.

[0031] Preferably, the numbers of the air blower and the air knife are both set to be multiple, and the multiple air knives are assembled in one-to-one correspondence with the air supply pipes arranged at the output ends of the multiple air blowers.

[0032] The technical effects and advantages of the present invention:

[0033] The printing paper is heated through two modes of gas infrared radiation and hot air. The infrared rays can penetrate and the physical characteristics of the object actively absorbing the infrared heat can quickly heat the inside of the ink and the paper. In the later stage, the high-temperature flue gas waste gas generated by the front-end gas infrared radiation burner is used, and the blower and the air blower are used to guide it to the air knife to dry the hot air in a circulating manner to quickly dry the surface of the ink. The gas consumption of the burner is lower, the heating speed is faster, the gas energy consumption is further reduced. Under the condition of the same gas consumption, the speed of the printing machine is significantly increased, meeting the requirement of lower gas energy consumption of the existing conventional gas burner, and achieving the purpose of energy conservation and emission reduction and improving production capacity;

[0034] Through the PID controller intelligent temperature control instrument, automatic constant temperature control is realized, and the drying operation parameters can be flexibly adjusted according to the paper thickness, heating time, etc. The temperature can be adjusted arbitrarily, solving the requirements of adjusting the wind speed and temperature according to different products and production volumes, and the frequency, air volume, and temperature can be automatically adjusted arbitrarily; in addition, the gas valve group has a manual control mode and an automatic control mode, which can not only make the combustion more sufficient and stable, save fuel while keeping the feeding channel at a constant temperature; while meeting the actual drying needs, it reduces energy consumption and reduces the potential damage to the paper. Description of the Drawings

[0035] Figure 1 Isometric view of the overall structure of the present invention (when the camera position bin is open);

[0036] Figure 2 Schematic diagram of the internal structure of the overall structure of the present invention;

[0037] Figure 3 Front cross-sectional view of the partial structure of the present invention;

[0038] Figure 4 For the present invention Figure 3 Cross-sectional view taken along the A-A direction in;

[0039] Figure 5 Isometric view of the first perspective of the gas valve group in the present invention;

[0040] Figure 6 Isometric view of the second perspective of the gas valve group in the present invention;

[0041] Figure 7 System control flowchart of the intelligent temperature control system based on PID controller in the present invention.

[0042] In the figure:

[0043] Furnace body casing - 1; Primary drying mechanism - 2; Secondary drying mechanism - 3; Air duct - 4; Blower - 5; Gas valve group - 6; Temperature sensor - 7; Flowmeter - 8; Pressure reducing valve - 9; Pressure switch - 10; PID controller - 11; Ball valve - 12; Manual flow regulating valve - 13; Protective net - 14; Diverter plate - 15; DN40 main gas pipeline - 16;

[0044] Heating chamber - 101; Camera position bin - 102; Feeding channel - 103;

[0045] Linear burner - 201; Far-infrared radiator - 202;

[0046] Supply blower - 301; Air knife - 302; Air supply pipe - 303;

[0047] DN40 gas branch pipe - 601; First pressure gauge - 602; First solenoid valve - 603; Gas flow regulating valve - 604; Air supply pipe - 605; Second pressure gauge - 606; Second solenoid valve - 607; Premixer - 608; Third solenoid valve - 609; Gas supply pipe - 610; BVM valve - 611; Air pump - 612. Detailed implementation mode

[0048] The following further describes an embodiment of the present invention in conjunction with the accompanying drawings:

[0049] Refer to the attached drawings of the specification Figure 1-7As shown in the figure, a gas infrared radiation hot air dual-mode drying furnace for drying printing ink includes a furnace body casing 1. The inner liner of the furnace body casing 1 is made of stainless steel, with an air blowing plate for punching, reinforced with angle iron and square tubes, and the outer part is made of steel plates;

[0050] Inside the furnace body casing 1, there are a heating chamber 101 and two machine position chambers 102. The two machine position chambers 102 are symmetrically distributed at the top and bottom of the heating chamber 101. On both sides of the middle part of the heating chamber 101, there are an inlet and an outlet passing through the furnace body casing 1 respectively, and a feeding channel 103 is formed between the inlet and the outlet of the heating chamber 101 for the feeding of printing paper. A primary drying mechanism 2 is jointly arranged at the front end of the machine position chamber 102 and the corresponding heating chamber 101, and a secondary drying mechanism 3 is jointly arranged at the rear end of the machine position chamber 102 and the corresponding heating chamber 101;

[0051] A wind channel 4 is installed inside the machine position chamber 102, and a blower 5 is arranged on the side wall of the wind channel 4 corresponding to the front end of the machine position chamber 102;

[0052] The primary drying mechanism 2 includes a linear burner 201 and a far-infrared radiator 202. The linear burner 201 is used to burn gas to heat the air inside the furnace body casing 1, and the far-infrared radiator 202 is installed at the end of the linear burner 201. The far-infrared radiator 202 is heated by the heat energy of the linear burner 201 to emit far-infrared rays and act on the printing paper in the feeding channel 103. An ignition induction integrated needle is arranged inside the linear burner 201, with automatic ignition, and is equipped with a flame detection safety system; The primary drying mechanism 2 refers to the Borsder infrared premixed burner. The nitrogen oxide emission of this burner is less than 30 milligrams per cubic meter of flue gas, which is an ultra-low nitrogen emission gas infrared radiation heater.

[0053] Any object will radiate energy to the outside. According to Boltzmann's law, the relationship between the radiated energy and temperature follows the following formula:

[0054] ;

[0055] It can be seen that the relationship between the energy radiated by an object and its temperature is a quartic relationship, that is, the higher the temperature of the object, the greater the energy radiated to the outside. Using the heat generated by gas combustion, the temperature of an object can be raised to 800 - 1000 °C, thereby radiating strong infrared rays with a corresponding wavelength of 2 - 4 µm.

[0056] Infrared rays are a type of invisible light that travels in a straight line at the speed of light and has a certain penetration power. After being absorbed by an object, infrared rays can be quickly converted into heat energy, thus having a strong heating effect. Different materials have different absorption rates for infrared rays, and water is one of the substances that can strongly absorb infrared rays. After water absorbs infrared rays, its temperature rises rapidly and it evaporates, which is the principle of infrared drying. The heating speed of infrared rays is several times faster than that of conventional hot air heating. Therefore, infrared rays can be used in occasions that require rapid heating and drying.

[0057] Since the linear burner 201 undergoes complete premixed combustion, the combustion is more complete, and the emission of CO is very low; and in the infrared combustion mode, the NOx emission is <10 ppm; adopting the complete premixed combustion method, the excess air coefficient is extremely low, and the thermal efficiency is increased by more than 10% compared with conventional burners; the size of the firepower can be controlled proportionally by controlling the efficiency of the blower 5 and the gas ratio to keep the temperature constant.

[0058] The secondary drying mechanism 3 includes a blower 301 and an air knife 302. The blower 301 is installed at the front end position of the side wall of the air duct 4 corresponding to the machine position bin 102. Its input end and the output end of the blower 5 are both connected to the air duct 4, and the blowing directions of the blower 301 and the blower 5 are opposite, so that the hot air produced by the primary drying mechanism 2 is pumped to the rear end of the heating bin 101. The output end of the blower 301 is connected to the air knife 302 through an air supply pipe 303. The air knife 302 is hoisted in the heating bin 101 and is symmetrically distributed on both sides of the feeding channel 103;

[0059] After the hot air is guided, it circulates in the heating bin 101, and the internal temperature uniformity is good, and the temperature of the empty box does not exceed ±5°C.

[0060] A gas valve group 6 is provided at the input end of the linear burner 201 for adjusting the drying environment in the heating bin 101.

[0061] Further, in the above technical solution, the gas valve group 6 includes:

[0062] A DN40 gas branch pipe 601, which is internally provided with a first pressure gauge 602, a first solenoid valve 603 and a gas flow regulating valve 604. The first pressure gauge 602 is used to test and display the pressure value of the gas inside the DN40 gas branch pipe 601. The first solenoid valve 603 is used to control the opening / closing of the DN40 gas branch pipe 601. The gas flow regulating valve 604 is used to control the gas flow; the gas flow regulating valve 604 can adjust the gas supply amount according to a certain proportion according to the power demand of the linear burner 201, so that the air-fuel ratio during combustion is maintained within a suitable range, thereby ensuring the stability and high efficiency of combustion, and reducing energy consumption and pollutant emissions.

[0063] The air supply pipe 605 is provided with a second pressure gauge 606 and a second solenoid valve 607, wherein the second pressure gauge 606 is used to test and display the pressure value of the air inside the air supply pipe 605, and the second solenoid valve 607 is used to control the opening / closing of the air supply pipe 605. The output end of the air supply pipe 605 is provided with an air pump 612, which is used to pump air into the air supply pipe 605 to provide sufficient combustion-supporting air for the combustion process. Combustion requires the gas and oxygen to be fully mixed, and the air pump 612 delivers air to the combustion area, so that the gas can burn more completely and efficiently, thereby improving the combustion efficiency, and helping to stabilize the flame, so that the combustion process can be carried out more safely and continuously.

[0064] The premixer 608 is used to premix the gas and air in proportion. The number of premixers 608 is set to be multiple. One end of the multiple premixers 608 is distributed in a linear array and connected to the air supply pipe 605. The other end of the premixer 608 extends to the input end of the corresponding linear burner 201. A third solenoid valve 609 is provided at the connection between the premixer 608 and the input end of the linear burner 201. Each third solenoid valve 609 controls the air intake of the burner of a linear burner 201. When the corresponding linear burner 201 is to be controlled to prepare for ignition, the third solenoid valve 609 is provided. When the third solenoid valve 609 is opened for ignition, and after ignition, it is kept open to supply gas for combustion; each premixer 608 is connected to the DN40 gas branch pipe 601 through the air supply pipe 610, and a BVM valve 611 is arranged in the premixer 608 to adjust and mix the gas and air; the BVM valve 611 can accurately control the flow of gas and air, and the cross-sectional area of the channel is changed by adjusting the opening of the BVM valve 611, thereby adjusting the amount of gas or air entering the linear burner 201 to achieve a suitable air-fuel ratio. In addition, in the mixing part of the premixer 608, the premixer 608 effect is used to fully mix the gas and air to ensure more complete and efficient combustion, which helps to optimize the combustion process and improve the combustion quality, and also reduces the emission of pollutants to a certain extent.

[0065] Furthermore, in the above technical solution, the connection ends of the blower 5 and the air supply fan 301 are both provided with frequency converters for controlling the air supply efficiency of the blower 5 and the air supply fan 301; the blower 5 and the air supply fan 301 adopt DC speed regulation to adjust the air volume and air pressure according to the combustion conditions.

[0066] A temperature sensor 7 is provided in the front end of the heating chamber 101 for sensing the temperature at the feeding channel 103; the temperature sensor 7 is a stainless steel armor K-type platinum resistance temperature sensor;

[0067] Flow meters 8 are installed inside both the DN40 gas branch pipe 601 and the air supply pipe 610, which are respectively used to measure the flow rates of gas and combustion-supporting air. By accurately measuring the flow rates, the gas and combustion-supporting air can be ensured to be mixed in a proper proportion. This is crucial for the combustion process, enabling the linear burner 201 to operate stably and efficiently, and contributing to achieving precise combustion control, thereby improving the combustion efficiency, reducing energy waste, and also lowering the risk of generating harmful gases due to incomplete combustion.

[0068] A pressure reducing valve 9 is installed inside the premixer 608, which is used to reduce the relatively high pressure from the gas source to the pressure range required for the normal operation of the linear burner 201, ensuring a stable gas supply pressure. If the pressure is too high, it may lead to dangerous situations such as unstable flames, flashbacks, or even explosions. When the gas source pressure fluctuates, the pressure reducing valve 9 can automatically adjust the output pressure to ensure that the linear burner 201 operates under a relatively stable pressure, thereby guaranteeing the combustion quality and efficiency.

[0069] A pressure switch 10 is installed inside the input end of the linear burner 201, which is used to monitor and control the pressure of the mixed fluid. When the pressure of the mixed fluid is abnormally too high or too low, the pressure switch 10 can detect it in a timely manner, thus avoiding situations such as unstable combustion, flashbacks, or flameouts caused by pressure problems. The pressure switch 10 is also used to control the start and stop of the linear burner 201. When the pressure of the mixed fluid is outside the normal range, it will send a signal to stop the linear burner 201 to ensure the safe operation of the equipment. When the pressure returns to normal, it allows the linear burner 201 to restart.

[0070] Furthermore, in the above technical solution, a PID controller 11 is provided on one side of the gas valve group 6. An A / D converter and a D / A converter are respectively provided at the input end and the output end of the PID controller 11. Among them, the temperature sensor 7, the flow meter 8, the first pressure gauge 602, the second pressure gauge 606, and the pressure switch 10 are all electrically connected to the A / D converter, and the first solenoid valve 603, the gas flow regulating valve 604, the second solenoid valve 607, the third solenoid valve 609, the BVM valve 611, the frequency converter of the blower 5 and the air supply fan 301, and the pressure reducing valve 9 are all electrically connected to the D / A converter.

[0071] Using the PID controller 11 intelligent temperature control instrument, automatic constant temperature control is achieved. The common working temperature is 80 - 200 °C at room temperature, which is set according to the thickness of the printed paper. In this embodiment, the temperature inside the heating chamber 101 is raised to 160 °C, and it can be adjusted arbitrarily above and below the above basic temperature. The temperature control accuracy is ±1 °C, ensuring that the temperature uniformity inside the heating chamber 101 is ±3 °C.

[0072] The connection terminal of the PID controller 11 is provided with an alarm module. When the temperature and the timing time exceed the set values, the heating is cut off, and at the same time, a buzzer gives a prompt.

[0073] Further, in the above technical solution, ball valves 12 are installed at both the inlet and outlet of the DN40 gas branch pipe 601; the ball valves 12 are used to control the on / off inside the DN40 gas branch pipe 601. When the ball valve 12 is opened, the gas can pass through smoothly, enabling the linear burner 201 to work normally; while when the ball valve 12 is closed, the flow of the corresponding fluid can be cut off. For example, during equipment maintenance, repair or in case of an emergency, the gas supply can be cut off in time to prevent gas leakage and avoid danger.

[0074] A manual flow regulating valve 13 is arranged on the air supply pipe 610, which is used to regulate the flow of gas or combustion-supporting air. By changing the opening degree of the manual flow regulating valve 13, the flow rate of the gas entering the linear burner 201 can be controlled, so as to achieve the purpose of adjusting the combustion power. Increasing the gas flow rate and correspondingly increasing the air flow rate can increase the output heat of the burner to meet different heating requirements.

[0075] Further, in the above technical solution, filters are arranged inside both the DN40 gas branch pipe 601 and the air supply pipe 610, which are used to filter impurities in the gas and combustion-supporting air. The filter can block the particulate impurities therein, preventing these impurities from entering the key components of the linear burner 201, avoiding component wear and blockage, and ensuring the normal operation of the gas valve group 6.

[0076] Further, in the above technical solution, a partition is arranged between the heating chamber 101 and the machine position chamber 102, and the partition is fixedly connected to the inner wall of the furnace body casing 1. The air supply pipe 303 and the pipeline at the input end of the linear burner 201 penetrate through the partition and are in interference fit with the through holes.

[0077] Further, in the above technical solution, a protective net 14 is arranged at the front end of the heating chamber 101 and between the far-infrared radiator 202 and the feeding channel 103, which is used to protect the printed paper. When the paper is wrinkled or warped, it will not directly contact the linear burner 201 or the far-infrared radiator 202, thus avoiding the potential hazard of fire. A flow dividing plate 15 is arranged at the rear end of the heating chamber 101 and between the air knife 302 and the feeding channel 103. A number of evenly distributed equalizing air holes are opened on it. A number of evenly distributed air jet ports are arranged at the output end of the air knife 302. Cooperating with the flow dividing plate 15, the blown air is fully dispersed, so that the hot air is evenly distributed and dries the ink on the printed paper.

[0078] Further, in the above technical solution, multiple groups of primary drying mechanisms 2 are provided, and the multiple groups of primary drying mechanisms 2 are axially symmetrically distributed in the two machine position chambers 102;

[0079] The number of the blowers 5 matches the number of the primary drying mechanisms 2. A plurality of linear burners 201 of the primary drying mechanism 2 share one exhaust pipe, and the input ends of the blowers 5 are docked with the corresponding exhaust pipes.

[0080] A plurality of DN40 gas branch pipes 601 are all connected to the DN40 gas main pipe 16, and the DN40 gas main pipe 16 is communicated with an external gas source through a high-pressure pump.

[0081] Further, in the above technical solution, the numbers of the air blowers 301 and the air knives 302 are both set to be plural, and the plurality of air knives 302 are assembled in one-to-one correspondence with the air delivery pipes 303 arranged at the output ends of the plurality of air blowers 301.

[0082] In this embodiment, 16 gas infrared radiation burners are adopted, with a single power of 30 KW and a total power of 480 KW. Fuel such as natural gas and liquefied gas is mixed with air and burned at the burner head. The heat generated by the combustion causes the temperature of the combustion products, mainly carbon dioxide and water vapor, to rise and be in an excited state. These gas molecules in the excited state will release energy in the form of infrared radiation. Infrared radiation is an electromagnetic wave. When its frequency matches the vibration frequency of the molecules of the object to be heated, it can be absorbed by the object, thereby increasing the internal molecular motion of the object, raising the temperature, and finally achieving the purpose of heating.

[0083] Further, a PID controller 11 intelligent temperature control instrument is adopted to realize automatic constant temperature control, so that the furnace temperature reaches the set temperature, and then the opening degree of the proportional actuator is adjusted by the PID controller 11 to maintain the furnace temperature at the set temperature. The hot air generated after the gas burns fully is guided and circulated in the heating chamber 101, making full use of the heat, saving energy consumption, and enabling the overall temperature inside the heating chamber 101 to be relatively uniform.

[0084] Specifically, in this embodiment, the gas valve group 6 has a manual control mode and an automatic control mode. In the automatic control mode, the probe of the temperature sensor 7 senses the temperature at the material feeding channel 103 and feeds back the temperature signal to the PID controller 11, thereby sending control commands to the actuators, including the first solenoid valve 603, the gas flow regulating valve 604, the second solenoid valve 607, the third solenoid valve 609, and the BVM valve 611, to reduce the internal aperture of the pipeline leading to the linear burner 201. This can not only make the combustion more sufficient and stable, save fuel, but also keep the temperature constant at the material feeding channel 103. In the manual control mode, when the temperature at the material feeding channel 103 is relatively high, or the paper is relatively thin and does not require too much heat energy, by manually closing some of the manual flow regulating valves 13, some of the linear burners 201 can work independently, and any redundant linear burners 201 can be closed arbitrarily, which can meet the actual drying needs while reducing energy consumption and reducing the potential damage to the paper.

[0085] Guide the printed paper through the feeding channel 103 to quickly dry the printed matter without damaging the paper quality, greatly improving the working efficiency.

[0086] The double-mode heating design of the drying furnace with gas infrared radiation heating and air circulation can quickly dry the ink, improve the output and quality, with bright coloring. The drying furnace reduces the emission of VOC gases; has ultra-low nitrogen emissions of nitrogen oxides; can arbitrarily set the air volume of the air knife and the gas temperature; has high temperature control accuracy, reduces the natural gas energy consumption for quick drying by 50%; the hot air circulation realizes the secondary utilization of the flue gas waste heat of the burner, and the overall power consumption of the equipment is reduced by more than 50% compared with the original equipment.

[0087] Finally: The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A gas infrared radiation hot air dual-mode drying furnace for drying printing ink, comprising a furnace body housing (1). Inside the furnace body housing (1), there is a heating chamber (101) and two working position chambers (102). The two working position chambers (102) are symmetrically distributed at the top and bottom of the heating chamber (101). On both sides of the middle of the heating chamber (101), there are respectively an inlet and an outlet penetrating through the furnace body housing (1), and the heating chamber (101) forms a feeding channel (103) between the inlet and the outlet for the feeding of printing paper. It is characterized in that: A primary drying mechanism (2) is jointly provided in the front end of the machine position bin (102) and its corresponding heating bin (101), and a secondary drying mechanism (3) is jointly provided in the rear end of the machine position bin (102) and its corresponding heating bin (101); An air duct (4) is installed in the machine position bin (102), and a blower (5) is provided on the side wall of the air duct (4) corresponding to the front end of the machine position bin (102); The primary drying mechanism (2) includes a linear burner (201) and a far-infrared radiator (202), wherein the linear burner (201) is used to burn gas to heat the air in the furnace casing (1), and the far-infrared radiator (202) is installed at the end of the linear burner (201); The secondary drying mechanism (3) includes a blower (301) and an air knife (302). The blower (301) is installed at a position on the side wall of the air duct (4) corresponding to the front end of the machine position bin (102). Its input end and the output end of the blower (5) are both communicated with the air duct (4), and the blowing directions of the blower (301) and the blower (5) are opposite, so that the hot tail gas produced by the linear burner (201) is pumped to the rear end of the heating bin (101). The output end of the blower (301) is communicated with the air knife (302) through an air supply pipe (303). The air knife (302) is hoisted in the heating bin (101) and is symmetrically distributed on both sides of the feeding channel (103); A gas valve group (6) is provided at the input end of the linear burner (201) for adjusting the drying environment in the heating bin (101); The gas valve group (6) includes: A DN40 gas branch pipe (601) internally provided with a first pressure gauge (602), a first solenoid valve (603) and a gas flow regulating valve (604). The first pressure gauge (602) is used to test and display the pressure value of the gas inside the DN40 gas branch pipe (601). The first solenoid valve (603) is used to control the opening / closing of the DN40 gas branch pipe (601), and the gas flow regulating valve (604) is used to control the gas flow; An air supply pipe (605) internally provided with a second pressure gauge (606) and a second solenoid valve (607). The second pressure gauge (606) is used to test and display the pressure value of the air inside the air supply pipe (605). The second solenoid valve (607) is used to control the opening / closing of the air supply pipe (605). An air pump (612) is provided at the output end of the air supply pipe (605) for pumping air into the air supply pipe (605); A premixer (608) for pre - mixing gas and air in proportion, with its quantity set to be multiple. One ends of the multiple premixers (608) are distributed in a linear array and connected to the air supply pipe (605). The other ends of the premixers (608) extend to the inlets of the corresponding linear burners (201), and a third solenoid valve (609) is provided at the connection between the premixer (608) and the inlet of the linear burner (201). Each premixer (608) is connected to the DN40 gas branch pipe (601) through a gas supply pipe (610). A BVM valve (611) is provided inside the premixer (608) for adjusting and mixing gas and air.

2. The gas infrared radiation hot air dual-mode drying furnace for drying printing ink according to claim 1, wherein: Frequency converters are provided at the connection ends of the blower (5) and the air supply fan (301) for controlling the air supply efficiency of the blower (5) and the air supply fan (301); A temperature sensor (7) is provided inside the front end of the heating chamber (101) for sensing the temperature at the material feeding channel (103); Flow meters (8) are provided inside both the DN40 gas branch pipe (601) and the gas supply pipe (610) for measuring the flow rates of gas and combustion - supporting air respectively; A pressure reducing valve (9) is provided inside the premixer (608) for reducing the relatively high pressure from the gas source to the pressure range required for the normal operation of the linear burner (201); A pressure switch (10) is provided inside the inlet of the linear burner (201) for monitoring and controlling the pressure of the mixed fluid.

3. A gas infrared radiation hot air dual-mode drying furnace for drying printing ink, characterized in that: A PID controller (11) is provided on one side of the gas valve group (6). An A / D converter and a D / A converter are respectively provided at the input end and the output end of the PID controller (11). Among them, the temperature sensor (7), the flow meter (8), the first pressure gauge (602), the second pressure gauge (606) and the pressure switch (10) are all electrically connected to the A / D converter. The first solenoid valve (603), the gas flow regulating valve (604), the second solenoid valve (607), the third solenoid valve (609), the BVM valve (611), the frequency converters of the blower (5) and the air supply fan (301) and the pressure reducing valve (9) are all electrically connected to the D / A converter.

4. A gas infrared radiation hot air dual-mode drying furnace for drying printing ink, characterized in that: Ball valves (12) are installed at both the inlet and the outlet of the DN40 gas branch pipe (601); A manual flow regulating valve (13) is provided on the gas supply pipe (610) for regulating the flow rate of gas or combustion - supporting air.

5. A gas infrared radiation and hot air dual-mode drying furnace for drying printing ink according to claim 1, characterized in that: Filters are provided inside both the DN40 gas branch pipe (601) and the gas supply pipe (610) for filtering impurities in the gas and combustion - supporting air.

6. The gas infrared radiation hot air dual-mode drying furnace for drying printing ink according to claim 1, wherein: A partition is provided between the heating chamber (101) and the machine position chamber (102), and the partition is fixedly connected to the inner wall of the furnace body casing (1). The air supply pipe (303) and the pipes at the inlets of the linear burners (201) penetrate through the partition and are in interference fit with the through - holes.

7. A gas infrared radiation hot air dual-mode drying furnace for drying printing ink, characterized in that: A protective net (14) is provided at the front end of the heating chamber (101) and between the far-infrared radiator (202) and the feeding channel (103), and a flow dividing plate (15) is provided at the rear end of the heating chamber (101) and between the air knife (302) and the feeding channel (103).

8. A gas infrared radiation hot air dual-mode drying furnace for drying printing ink, characterized in that: A plurality of groups of primary drying mechanisms (2) are provided, and the plurality of groups of primary drying mechanisms (2) are axially symmetrically distributed in two machine position bins (102); The number of the blowers (5) matches the number of the primary drying mechanisms (2), and a plurality of linear burners (201) of the primary drying mechanisms (2) share one exhaust pipe, and the input end of the blower (5) is docked with the corresponding exhaust pipe; A plurality of DN40 gas branch pipes (601) are all connected to the DN40 gas main pipe (16), and the DN40 gas main pipe (16) is communicated with an external gas source through a high-pressure pump.

9. A gas infrared radiation hot air dual-mode drying furnace for drying printing ink, characterized in that: The number of the air supply fans (301) and the air knives (302) are both set to be a plurality, and the plurality of air knives (302) are assembled in one-to-one correspondence with the air supply pipes (303) arranged at the output ends of the plurality of air supply fans (301).

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