CN107310264B - Air circulation system of multicolor printing machine - Google Patents
Air circulation system of multicolor printing machine Download PDFInfo
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- CN107310264B CN107310264B CN201710479861.6A CN201710479861A CN107310264B CN 107310264 B CN107310264 B CN 107310264B CN 201710479861 A CN201710479861 A CN 201710479861A CN 107310264 B CN107310264 B CN 107310264B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F33/00—Indicating, counting, warning, control or safety devices
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Abstract
The invention discloses an air circulation system of a multicolor printing machine, which comprises n printing color groups, wherein n is more than or equal to 2, each printing color group comprises an air inlet and an air outlet, the air outlet of at least one printing color group is communicated with a main exhaust pipe through an exhaust valve, the air outlet of at least one printing color group is communicated with a main air return pipe through an air return valve, the air outlet of each printing color group is at least communicated with the main exhaust pipe or the main air return pipe, the air inlet of each printing color group is communicated with the main air return pipe, and the outlet of the main exhaust pipe is communicated with a waste gas treatment device. The air circulation system of the multicolor printing machine can obtain multicolor printing waste gas with small exhaust amount and high VOCs content, simultaneously can directly discharge the waste gas of one or more full-page printing color groups, and the waste gas of one or more non-full-page printing color groups enters the total return air pipe for circulation, thereby improving the waste gas treatment efficiency and reducing the waste gas treatment cost in multicolor printing.
Description
Technical Field
The invention relates to energy conservation and emission reduction of multicolor printing, in particular to an air circulation system of a multicolor printing machine, and specifically relates to an air circulation system of a multicolor printing machine for decorating materials.
Background
Multicolor printing is widely used in industrial production, for example, multicolor printing is used for PVC floors, building walls and furniture surface decoration materials, wherein the multicolor printing is to coat ink on a printed body and then dry the printed body, until now, solvent-based ink, i.e. ink containing VOCs (volatile organic compounds) is generally used, and the ink containing VOCs generates a large amount of gas containing VOCs during the drying process. Since the VOCs after being discharged into the atmosphere can react with nitrogen oxides (NOx) in the air under the irradiation of sunlight to generate PM2.5 and ozone which is harmful to human bodies, namely haze which is a particular concern, China has adopted strict regulation means to limit the discharge of the VOCs, and the elimination of the discharge of VOCs in multicolor printing has become an industry consensus.
In order to reduce the emission of VOCs, an alternative method of multicolor printing by using water-based ink exists at present, however, due to the technology and cost, a certain time is needed for the full use of the water-based ink in multicolor printing. Therefore, it is important to develop a technology for eliminating VOCs contamination generated by the existing ink.
Currently, oxidation technologies, including thermal oxidation and catalytic oxidation, are mainly used to eliminate the emissions of VOCs. Thermal oxidation eliminates VOCs by decomposing them into water and carbon dioxide at temperatures around 700 c, which have no negative impact on the environment, whereas catalytic oxidation converts VOCs into water and carbon dioxide at relatively low temperatures by the action of a catalyst. However, whether thermal oxidation is used for eliminating VOCs or catalytic oxidation is used for eliminating VOCs, the investment cost of equipment is related to the air volume needing to be processed, and the larger the air volume is, the higher the investment cost is. In addition, no matter thermal oxidation eliminates VOCs or catalytic oxidation eliminates VOCs, the concentration of VOCs in the waste gas influences the operation cost of equipment, and the lower the concentration of VOCs, the larger the air volume to be treated, and the higher the cost. Therefore, the key for economically eliminating VOCs pollution in multicolor printing is to reduce the air discharge quantity of the multicolor printing machine and improve the VOCs concentration in multicolor printing.
In addition, when solvent-based ink is used for printing, the solvent residue on the printed matter is one of the important problems troubling multicolor printing, and how to reduce the solvent residue on the printed matter is also a problem which needs to be solved by the multicolor printing industry.
Although packaging material printer air circulation systems are currently being investigated, multicolor printing of decorative materials is significantly different from packaging material multicolor printing. The multicolor printing of the decorative material is different from the printing of the common packaging material in that: firstly, the printing ink consumption is large during printing, the concentration of VOCs in waste gas discharged from a full-page printing color group is high enough, the waste gas can be directly treated by a thermal oxidation or catalytic oxidation device, and secondly, the full-page number in the printing process can exceed one, and any printing color group can be in full-page printing. The air circulation system of the existing packaging material printing machine cannot meet the requirement of multicolor printing of decorative intaglio materials.
Therefore, how to reduce the discharge amount of waste gas containing VOCs in multicolor printing and obtain high-concentration waste gas containing VOCs to meet the requirement of multicolor printing of decorative intaglio material becomes a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of this, the invention provides an air circulation system for a multicolor printing machine, which reduces the discharge amount of VOCs-containing waste gas in multicolor printing and obtains high-concentration VOCs waste gas, thereby reducing the waste gas treatment cost in multicolor printing and meeting the requirements of multicolor printing of decorative intaglio materials.
On one hand, the air circulation system of the multicolor printing machine comprises n printing color groups, wherein n is more than or equal to 2, each printing color group comprises an air inlet and an air outlet, the air outlet of at least one printing color group is communicated with a main exhaust pipe through an exhaust valve, the air outlet of at least one printing color group is communicated with a main air return pipe through an air return valve, the air outlet of each printing color group is at least communicated with the main exhaust pipe or the main air return pipe, the air inlet of each printing color group is communicated with the main air return pipe, and the outlet of the main exhaust pipe is communicated with an exhaust gas treatment device.
In the air circulation system of the multicolor printing machine, the air outlets of the printing color groups are preferably communicated through the air collecting pipe.
In the above air circulation system of the multicolor printing machine, preferably, the air outlet of each printing color set is communicated with the main exhaust pipe through an exhaust valve, the air outlet of each printing color set is communicated with the main air return pipe through an air return valve, the air inlet of each printing color set is communicated with the main air return pipe, and the outlet of the main exhaust pipe is communicated with the exhaust gas treatment device.
The multicolor printing machine air circulation system preferably further comprises a main circulation fan, the outlet of the main exhaust pipe is communicated with the inlet of the main circulation fan, the outlet of the main circulation fan is communicated with the waste gas treatment device, and the concentration of the inlet or the outlet of the main circulation fan is used for adjusting the air suction amount of the main circulation fan.
The multicolor printing machine air circulation system preferably further comprises a controller and a VOCs concentration measuring instrument arranged at an inlet or an outlet of the main circulating fan, wherein the controller is connected with the VOCs concentration measuring instrument and the main circulating fan, and the controller is used for controlling the air suction volume of the main circulating fan according to the VOCs concentration detected by the VOCs concentration measuring instrument.
In the above air circulation system of the multicolor press, preferably, a first threshold value of the concentration of VOCs and a second threshold value of the concentration of VOCs are preset in the controller, and the controller is configured to control the operating frequency of the main circulation fan to increase when the concentration of VOCs detected by the VOCs concentration measuring instrument is greater than the first threshold value of the concentration of VOCs, so as to increase the air draft of the main circulation fan; the controller is used for controlling the operating frequency of the main circulating fan to be reduced when the concentration of VOCs detected by the VOCs concentration measuring instrument is smaller than the second VOCs concentration threshold value so as to reduce the air suction quantity of the main circulating fan, and the second VOCs concentration threshold value is smaller than the first VOCs concentration threshold value.
Foretell multicolor press air circulation system, preferably, n the printing colour unit sets up in parallel in proper order, the gas vent of 1 st printing colour unit is through 1 st discharge valve intercommunication total exhaust pipe, the gas vent of 1 st printing colour unit is through 1 st air return valve intercommunication total return air pipe, the gas vent of 2 nd printing colour unit is through 2 nd discharge valve intercommunication total exhaust pipe, the gas vent of 2 nd printing colour unit is through 2 nd air return valve intercommunication total return air pipe, … …, the gas vent of n th printing colour unit is through n th discharge valve intercommunication total exhaust pipe, the gas vent of n th printing colour unit is through n number air return valve intercommunication total return air pipe.
In the above air circulation system of a multicolor printing machine, preferably, the printing color set includes a first printing color set, the first printing color set is further provided with a first air supplement channel, and the first air supplement channel is provided with a first air supplement valve.
In the above air circulation system of a multicolor printing machine, preferably, the first printing color set further includes a first air control heat exchanger and a first printing drying tunnel, an inlet of the first air control heat exchanger is simultaneously communicated with an outlet of the first air supplement valve and an air inlet of the first printing color set, an outlet of the first air control heat exchanger is communicated with an inlet of the first printing drying tunnel, and an outlet of the first printing drying tunnel is communicated with an air outlet of the first printing color set.
In the above air circulation system of the multicolor printing machine, preferably, the first printing color set further includes a first color set air supply fan, a first return air regulating valve and a first exhaust air regulating valve, an inlet of the first air control heat exchanger is simultaneously communicated with an outlet of the first air supplement valve and an air inlet of the first printing color set through the first color set air supply fan, a first inlet of the first color set air supply fan is connected to the air inlet of the first printing color set, a second inlet of the first color set air supply fan is connected to the outlet of the first air supplement valve, and an outlet of the first color set air supply fan is connected to the inlet of the first air control heat exchanger; the first printing color group further comprises a first air return adjusting valve, and the first air return adjusting valve is arranged between a first inlet of the first color group air supply fan and an air inlet of the first printing color group; the first printing color group further comprises a first exhaust regulating valve, and the outlet of the first printing drying channel is communicated with the exhaust port of the first printing color group through the first exhaust regulating valve.
The invention provides an air circulation system of a multicolor printing machine, wherein an exhaust port of at least one printing color group is communicated with a main exhaust pipe through an exhaust valve, an exhaust port of at least one printing color group is communicated with a main air return pipe through an air return valve, an exhaust port of each printing color group is at least communicated with the main exhaust pipe or the main air return pipe, an air inlet of each printing color group is communicated with the main air return pipe, the printing color group communicated with the main exhaust pipe through the exhaust valve can be controlled to be full, waste gas of the full printing color group is directly exhausted into a waste gas treatment device through the exhaust valve, and waste gas of other non-full printing color groups enters the main air return pipe through the air return valve for circulation, so that the concentration of VOCs entering the waste gas treatment device is high, the waste gas treatment efficiency is improved, and the waste gas treatment cost is.
In an optimal technical scheme, an air outlet of each printing color group is communicated with a main exhaust pipe through an air outlet valve, an air outlet of each printing color group is communicated with a main air return pipe through an air return valve, an air inlet of each printing color group is communicated with the main air return pipe, and an outlet of the main exhaust pipe is communicated with a waste gas treatment device. When the air circulation system of the multicolor printing machine is applied to multicolor printing of decorative materials, the characteristic of large usage amount of printing ink is considered, because the exhaust port of each printing color group is communicated with the main exhaust pipe through the exhaust valve, the exhaust port of each printing color group is communicated with the main return air pipe through the air return valve, waste gas of any full printing color group can be directly discharged to enter the waste gas treatment device (can pass through the main circulation fan), and waste gas of any non-full printing color group enters the main return air pipe through the air return valve to be circulated (certainly, the waste gas can also be controlled to enter the waste gas treatment device when the printing is not full), so that the concentration of VOCs entering the waste gas treatment device is high, the efficiency of waste gas treatment is improved, and the cost of waste gas treatment is reduced.
In a further scheme, the system further comprises a main circulating fan, the outlet of the main exhaust pipe is communicated with the inlet of the main circulating fan, the outlet of the main circulating fan is communicated with the waste gas treatment device, the VOCs concentration at the inlet or the outlet of the main circulating fan is used for adjusting the air suction quantity of the main circulating fan MB, the VOCs concentration can be measured by a VOCs concentration measuring instrument, the air suction quantity can be realized by controlling the operating frequency of the main circulating fan MB, of course, when the number of the main circulating fans MB is more than that of the main circulating fan MB, the operating frequency of the main circulating fan MB can be adjusted, for example, when the VOCs concentration is higher than a set value, the operating frequency of the main circulating fan MB is adjusted to be increased, the exhaust air quantity of the printer is increased, thereby obtaining high-concentration Cs waste gas, the air draft amount is reduced, so that the discharge amount of waste gas containing VOCs in multicolor printing is reduced. Therefore, the concentration of VOCs in the discharged waste gas can be realized by adjusting the air draft of the main circulating fan, the adjusting mode is simple and reliable, and meanwhile, the concentration of VOCs entering the waste gas treatment device for treating VOCs of the waste gas treatment device can be adjusted, so that the air circulating system can obtain multicolor printing waste gas with small air discharge amount and high VOCs content through the simple adjusting mode.
In a further technical scheme, the printing color set comprises a first printing color set, the first printing color set is further provided with a first air supplement channel for supplementing fresh air, and a first air supplement valve is arranged on the first air supplement channel. Since the fresh air supply to the first print couple is controlled by a separate first air supply valve, the amount of fresh air supply can be controlled according to the amount of ink to ensure that the first print couple operates at a safe concentration of VOCs.
In the preferred technical scheme, the circulating air of the printing drying tunnel is extracted from exhaust gas, the concentration of VOCs in the circulating air of the printing drying tunnel is greatly increased, the concentration difference required by the evaporation of a printing surface solvent is reduced, the evaporation speed of the solvent is reduced, so that the situation that the surface of the printing body is dried and solidified too fast by the ink is avoided, and the solvent in the ink on the printing body can be smoothly volatilized, therefore, the solvent residue on the printing body can be greatly reduced by adopting the printing drying tunnel circulating method described by the invention; when a certain printing color group does not work, all the valve air supplement valves, the return air regulating valves and the exhaust regulating valves on the corresponding printing color group can be closed, and the exhaust volume of the printing machine is reduced. In addition, the air exhaust volume is controlled by the concentration of VOCs, and the total air exhaust volume is convenient to control. In addition, considering the characteristic of large using amount of printing ink, the waste gas of all full-page printing color groups is directly discharged, and the positions of direct exhaust and printing return air can be selected through the 1 st exhaust valve, the 2 nd exhaust valve, … …, the nth exhaust valve, the 1 st return air valve, the 2 nd return air valve, … … and the nth return air valve according to the number of full-page printing.
Drawings
FIG. 1 is a schematic view of a first multicolor press air circulation system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a second air circulation system of a multicolor press according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a third multicolor press air circulation system according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a fourth air circulation system of a multicolor press according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a fifth air circulation system of a multicolor press according to an embodiment of the present invention;
FIG. 6 is a schematic structural view of an air circulation system of a sixth multicolor press according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an air circulation system of a seventh multicolor press according to an embodiment of the present invention.
In the figure: 10 total exhaust pipes; 20 total return air pipes; 30 gas collecting pipes; x1, X2-X8: the first printing color group, the second printing color group-the eighth printing color group are collectively called as a printing color group; f1, F2-Fn 1 st air return valve, 2 nd air return valve-8 th air return valve; MB main circulating fan; d1, D2-D8 first air make-up valve, second air make-up valve-eighth air make-up valve; c1, C2-C8 first color group air supply fan, second color group air supply fan-eighth color group air supply fan; a1, A2-A8 first return air regulating valve, second return air regulating valve-eighth return air regulating valve; e1, E2-E8 first exhaust gas regulating valve, second exhaust gas regulating valve-eighth exhaust gas regulating valve; h1, H2-H8 first air control heat exchanger, second air control heat exchanger-eighth air control heat exchanger; b1, B2-B8 a first printing drying tunnel, a second printing drying tunnel and an eighth printing drying tunnel; k1, K2-K8 the 1 st exhaust valve, the 2 nd exhaust valve-the 8 th exhaust valve.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
It should be noted that the terms "first", "second", "… …" and "eighth" in the present invention are only used for distinguishing different structures and components, and are not used to distinguish one from another, and are not limited to the structures or the components themselves; meanwhile, the term "and/or" in the present invention means that one of the schemes a and/or B may be provided or selected, and includes three cases of scheme a, scheme B, scheme a and scheme B.
As shown in fig. 1-7, the present invention provides an air circulation system of a multicolor printing machine, especially suitable for multicolor printing of decorative materials, comprising n printing color groups X1, … …, Xn, n is greater than or equal to 2, each printing color group X1, … …, Xn comprises an air inlet and an air outlet, the air outlet of at least one printing color group X1, … …, Xn is communicated with a total air exhaust pipe 10 through an air exhaust valve K1, … …, Kn, the air outlet of at least one printing color group X1, … …, Xn is communicated with a total air return pipe 20 through an air return valve F1, … …, Fn, the air outlet of each printing color group X1, … …, Xn is at least communicated with the total air exhaust pipe 10 or the total air return pipe 20, the air inlet of each printing color group X1, … …, Xn is communicated with the total air return pipe 20, and the outlet of the total air exhaust pipe 10 is communicated with an exhaust gas treatment. In this embodiment, the number n of the printing color sets may be any number, such as 2, 3, 4, 5, 6, 7, 8, 10, 15, etc., fig. 1 shows an embodiment where n is 2, fig. 2 to 5 show a specific embodiment where n is 5, and fig. 6 to 7 show an embodiment where n is 8. It is understood that the exhaust gas treatment device of the present invention is an exhaust gas treatment device for treating VOCs, and reference may be made to the prior art, such as a rotating wheel for VOCs, a catalytic combustion device, and a regenerative combustion device. Taking fig. 4 as an example, the exhaust ports of the 1 st printing color group X1 and the 5 th printing color group X5 are communicated with the total exhaust duct 10 through the exhaust valves K1 and K5, the exhaust ports of the 1 st printing color group X1 and the 4 th printing color group X4 are communicated with the total air return duct 20 through the air return valves F1 and F4, and the exhaust ports of the 1 st printing color group X1 to the 5 th printing color group X5 are communicated, so that the exhaust ports of the 1 st printing color group X1 to the 5 th printing color group X5 can be communicated with the total exhaust duct 10 or the total air return duct 20. Other embodiments are similar to the embodiment of fig. 4 and will not be described herein.
When the air circulation system of the multicolor printing machine is applied to multicolor printing of decorative materials, considering the characteristic of large usage amount of printing ink, because the exhaust ports of at least one printing color group X1, … … and Xn are communicated with the total exhaust pipe 10 through exhaust valves K1, … … and Kn, the exhaust ports of at least one printing color group X1, … … and Xn are communicated with the total air return pipe 20 through air return valves F1, … … and Fn, the exhaust ports of all the printing color groups X1, … … and Xn are at least communicated with the total exhaust pipe 10 or the total air return pipe 20, the air inlet ports of all the printing color groups X1, … … and Xn are communicated with the total air return pipe 20, the waste gas of full printing color groups can be controlled to be directly discharged into a waste gas treatment device (can pass through a main circulation fan MB) through the exhaust valves, the waste gas of other non-full printing color groups enters the total air return pipe 20 through the air return valves for circulation, so that the concentration of VOCs entering the waste, the efficiency of exhaust-gas treatment is improved, the cost of exhaust-gas treatment has been reduced. Preferably, the "printing color group communicating with the main exhaust duct 10 through the exhaust valve" is made full.
Preferably, as shown in fig. 4 and 6, the exhaust ports of the 1 st printing color group X1 and the last printing color group (X5 in fig. 4 and X8 in fig. 6) are communicated with the main exhaust duct 10 through exhaust valves, so that, in the case that the first color group and the last color group are full, which are common in multicolor printers, the corresponding exhaust valves can be opened, and the exhaust gas of the full printing color group is directly exhausted into the exhaust gas treatment device through the exhaust valves. The efficiency of exhaust-gas treatment is improved, the cost of exhaust-gas treatment has been reduced.
Preferably, as shown in fig. 4-7, to simplify the piping, the exhaust ports of the respective printing color groups X1, … …, Xn are communicated through the gas collecting pipe 30, the gas collecting pipe 30 is communicated with the main exhaust pipe 10 through at least one exhaust valve K1, … …, Kn, and the gas collecting pipe 30 is communicated with the main return pipe 20 through at least one air return valve F1, … …, Fn. Specifically, as shown in fig. 4 and 6, for most cases in the above-described multicolor printing machine, a full plate of a printing color group is set at the first X1, or the last Xn, a valve K1 is installed between the gas collecting pipe 30 and the main gas exhausting pipe 10 at the position of the first color group, a valve Kn is installed at the last color group, when the first color group is full, K1 is opened, Kn is closed, and the high-concentration exhaust gas of the full plate is mostly discharged to the exhaust gas treatment device through the main gas exhausting pipe 10 directly through the K1 without participating in circulating return air; when the last color group is full, K1 is closed, Kn is opened, so that the high-concentration waste gas generated by the last full plate is mostly directly discharged to a waste gas treatment device through Kn through a main exhaust pipe without participating in circulating air return, thereby reducing the waste gas treatment amount, improving the waste gas treatment efficiency and reducing the waste gas treatment cost.
In the above scheme, as shown in fig. 1 to 3, preferably, each of the printing color groups X1, … …, Xn is provided with an air inlet and an air outlet, the air outlet of each of the printing color groups X1, … …, Xn is communicated with the main exhaust duct 10 through an air outlet valve K1, … …, Kn, the air outlet of each of the printing color groups X1, … …, Xn is communicated with the main return duct 20 through an air return valve F1, … …, Fn, the air inlet of each of the printing color groups X1, … …, Xn is communicated with the main return duct 20, and the outlet of the main exhaust duct 10 is communicated with the exhaust gas treatment device.
In the scheme, the exhaust ports of each printing color group X1, … … and Xn are communicated with the main exhaust pipe 10 through exhaust valves K1, … … and Kn, the exhaust ports of each printing color group X1, … … and Xn are communicated with the main return air pipe 20 through air return valves F1, … … and Fn, so that the waste gas of any full printing color group can be directly discharged into the waste gas treatment device (can pass through the main circulating fan MB), and the waste gas of any non-full printing color group enters the main return air pipe 20 through the air return valves to be circulated, so that the concentration of VOCs entering the waste gas treatment device is high, the waste gas treatment efficiency is improved, and the waste gas treatment cost is reduced.
The air circulation system of the multicolor printing machine preferably further comprises a main circulation fan MB, an outlet of the main exhaust pipe 10 is communicated with an inlet of the main circulation fan MB, an outlet of the main circulation fan MB is communicated with the waste gas treatment device, and the concentration of VOCs at the inlet or the outlet of the main circulation fan MB is used for adjusting the air suction amount of the main circulation fan MB. In this scheme, because the VOCs concentration of main circulating fan MB import or export is used for adjusting main circulating fan MB's convulsions volume, VOCs concentration can be measured through VOCs concentration measurement appearance, convulsions volume can be realized through the operating frequency of controlling main circulating fan MB, certainly when main circulating fan MB is a plurality of, the number that main circulating fan MB was opened can also be adjusted and realize, for example, when VOCs concentration is higher than the setting value, adjust main circulating fan MB's operating frequency and increase, make convulsions volume increase, the printing machine waste gas discharge capacity increases, thereby obtain high concentration VOCs waste gas, when VOCs concentration is less than the setting value, adjust main circulating fan MB's operating frequency and reduce, make convulsions volume reduce, thereby it contains VOCs waste gas discharge capacity to reduce polychrome printing. Therefore, the concentration of VOCs in the discharged waste gas can be realized by adjusting the air draft of the main circulating fan MB, the adjusting mode is simple and reliable, and meanwhile, the concentration of VOCs entering the waste gas treatment device for treating VOCs of the waste gas treatment device can be adjusted, so that the air circulating system can obtain multicolor printing waste gas with small air discharge amount and high VOCs content through the simple adjusting mode.
The air circulation system of the multicolor printing machine preferably further comprises a controller and a VOCs concentration measuring instrument (VOC in figures 1-7) arranged at the inlet or the outlet of the main circulation fan MB, wherein the controller is connected with the VOCs concentration measuring instrument and the main circulation fan MB, and the controller is used for controlling the air suction volume of the main circulation fan MB according to the VOCs concentration detected by the VOCs concentration measuring instrument. Specifically, a first VOCs concentration threshold is preset in the controller, and the controller is configured to control the operating frequency of the main circulation fan MB to increase when the concentration of VOCs detected by the VOCs concentration measuring instrument is greater than the first VOCs concentration threshold, so as to improve the air suction volume of the main circulation fan MB. Further, a second VOCs concentration threshold value is preset in the controller, the controller is used for controlling the operation frequency of the main circulating fan MB to be reduced when the concentration of VOCs detected by the VOCs concentration measuring instrument is smaller than the second VOCs concentration threshold value, so that the air suction volume of the main circulating fan MB is reduced, and the second VOCs concentration threshold value is smaller than the first VOCs concentration threshold value.
In the above scheme, preferably, as shown in fig. 1 to 3, n printing color sets X1, … …, Xn are sequentially arranged in parallel, the exhaust port of the 1 st printing color set X1 is communicated with the total exhaust duct 10 through the 1 st exhaust valve K1, the exhaust port of the 1 st printing color set X1 is communicated with the total air return duct 20 through the 1 st air return valve F1, the exhaust port of the 2 nd printing color set X2 is communicated with the total exhaust duct 10 through the 2 nd exhaust valve K2, the exhaust port of the 2 nd printing color set X2 is communicated with the total air return ducts 20, … … through the 2 nd air return valve F2, the exhaust port of the nth printing color set Xn is communicated with the total exhaust duct 10 through the nth exhaust valve Kn, and the exhaust port of the nth printing color set Xn is communicated with the total air return duct 20 through the nth air return valve Fn. At this time, taking fig. 1 as an example, when the 1 st printing color group X1 is a full printing color group and the 2 nd printing color group X2 is a non-full printing color group, because the full printing ink usage is large and the concentration of VOCs in the exhaust gas discharged by the full printing color group is high enough, the exhaust gas can be directly sent to a thermal oxidation or catalytic oxidation device for treatment, at this time, the 1 st exhaust valve K1 can be opened to allow the full printing exhaust gas to directly enter the exhaust gas treatment device, the 1 st air return valve F1 is closed, the 2 nd exhaust valve K2 is closed, the 2 nd air return valve F2 is opened, and the non-full printing exhaust gas is recycled through the air return valve. Namely, the waste gas discharged by the full printing color group X1 is not used as the return air, and the waste gas discharged by the non-full printing color group X2 can be used as the return air to enter the total return air pipe 20, thereby improving the waste gas treatment efficiency.
As shown in fig. 2 and 3, the number n of the printing color sets is greater than or equal to 5, and it is assumed that, when the 3 rd printing color set X3 is a full printing color set and the other printing color sets X1, X2, X4, and X5 are non-full printing color sets, because the full printing ink usage is large, the concentration of VOCs in the exhaust gas discharged by the full printing color set is sufficiently high, and the exhaust gas can be directly treated by the thermal oxidation or catalytic oxidation device, at this time, the 3 rd exhaust valve K3 can be opened to allow the exhaust gas of the full printing to directly enter the exhaust gas treatment device, the 3 rd air return valve F3 is closed, meanwhile, the 1 st, 2 nd, 4 nd, and 5 th exhaust valves K1, K2, K4, and K5 are closed, the 1 st, 2 nd, 4 th, 5 th air return valves F1, F2, F4, and F5 are opened, so that the exhaust gas of the non-full printing is repeatedly utilized through the air return valves, and when the other one or more printing color sets are full printing color sets, which is similar.
In the air circulation system of the multicolor printing machine, the printing color groups X1, … … and Xn include the first printing color group X1, the first printing color group X1 is further provided with a first air supplement channel for supplementing fresh air, and the first air supplement channel is provided with the first air supplement valve D1. Since the fresh air replenishment of the first print couple X1 is controlled by the independent first air replenishment valve D1, the replenishment of fresh air can be controlled in accordance with the amount of ink to ensure that the first print couple X1 operates under safe VOCs concentration conditions.
Further, the first printing color group X1 further includes a first air control heat exchanger H1 and a first printing drying tunnel B1, an inlet of the first air control heat exchanger H1 is simultaneously communicated with an outlet of the first air supplement valve D1 and an air inlet of the first printing color group X1, an outlet of the first air control heat exchanger H1 is communicated with an inlet of the first printing drying tunnel B1, and an outlet of the first printing drying tunnel B1 is communicated with an air outlet of the first printing color group X1.
Further, the first printing color group X1 further includes a first color group air supply fan C1, an inlet of the first air control heat exchanger H1 is simultaneously communicated with an outlet of the first air supplement valve D1 and an air inlet of the first printing color group X1 through the first color group air supply fan C1, a first inlet of the first color group air supply fan C1 is connected with an air inlet of the first printing color group X1, a second inlet of the first color group air supply fan C1 is connected with an outlet of the first air supplement valve D1, and an outlet of the first color group air supply fan C1 is connected with an inlet of the first air control heat exchanger H1.
Further, the first printing color group X1 further includes a first air return adjustment valve a1 and a first exhaust adjustment valve E1, the first air return adjustment valve a1 is disposed between the first inlet of the first color group blower C1 and the air inlet of the first printing color group X1; the outlet of the first printing oven B1 communicates with the vents of the first printing couple X1 through a first vent control valve E1.
It should be noted that, as shown in fig. 6-7, the printing color sets X1, … …, Xn may further include a second printing color set X2, a third printing color set X3, … …, and an eighth printing color set X8, and each printing color set may include an air supplement valve, a color set air supply fan, a return air regulating valve, an exhaust air regulating valve, an air control heat exchanger, and a printing drying tunnel, and the connection relationship of the air supplement valve, the color set air supply fan, the return air regulating valve, the exhaust air regulating valve, the air control heat exchanger, and the printing drying tunnel in each printing color set is the same as that in the first printing color set X1. Therefore, fresh air supplement of different printing color groups can be controlled through independent air supplement valves, the supplement amount of the fresh air can be controlled according to the ink amount, and each printing unit is ensured to operate under the condition of safe VOCs concentration.
In the air circulation system of the multicolor printing machine, the number of the turned-on color group air supply fans C1, C2, … … of the plurality of printing color groups X1, … …, Xn may be used to control the operation frequency of the main circulation fan MB. Therefore, the total circulating air quantity is automatically adjusted through the opening number of the color group air supply fans, and the adjusting mode is simple. Specifically, the color group air supply fans of each of the printing color groups X1, … …, Xn may be connected to the controller, and the main circulation fan MB may also be connected to the controller, and the controller may control the operation frequency of the main circulation fan MB according to the number of the turned-on color group air supply fans of each of the printing color groups X1, … …, Xn, thereby implementing automatic control of the total circulation air volume.
It should be noted that, in multicolor printing, the evaporation of the solvent in the ink on the printing body needs to satisfy two conditions at the same time, the first, evaporation needs heat, at present, the heat is transferred to the printing body by the hot air circulating through the drying tunnel, the larger the air circulating through the drying tunnel is, the faster the heat transfer speed is, and the solvent evaporation speed on the printing body is increased; secondly, the concentration difference between the VOCs concentration on the surface of the printing body and the VOCs concentration of the circulating air needs to be established during evaporation, and the larger the concentration difference is, the faster the evaporation speed of the solvent on the printing body is. The multicolor press air circulation system of this embodiment, when return air concentration increases, printing ink evaporation rate descends, has avoided the phenomenon that printing ink surface drying and hardening stops inside printing ink to evaporate.
Meanwhile, in the air circulation system of the multicolor printing machine, the circulating air of the printing drying tunnels B1 and B2-B8 is extracted from the exhaust air, the concentration of VOCs in the circulating air of the drying tunnels is greatly increased, the concentration difference required by the evaporation of the solvent on the printing surface is reduced, and the evaporation speed of the solvent is reduced, so that the excessive drying and surface solidification of the ink on the surface of the printing body are avoided, and the solvent in the ink on the printing body can be smoothly volatilized, therefore, the solvent residue on the printing body can be greatly reduced by adopting the printing drying tunnel circulation method described by the invention; when a certain printing color group does not work, all the valve air supplement valves, the return air regulating valves and the exhaust regulating valves on the corresponding printing color group can be closed, and the exhaust volume of the printing machine is reduced. In addition, the air exhaust volume is controlled by the concentration of VOCs, and the total air exhaust volume is convenient to control. In addition, considering the characteristic of large using amount of printing ink, the waste gas of all full-page printing color groups is directly discharged, and the positions of direct exhaust and printing return air can be selected through the 1 st exhaust valve K1, the 2 nd exhaust valves K2, … …, the nth exhaust valve Kn, the 1 st return air valve F1, the 2 nd return air valves F2, … … and the nth return air valve Fn according to the number of full-page printing.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An air circulation system of a multicolor printing machine, comprising n printing color groups (X1, … …, Xn), n is more than or equal to 2, each printing color group (X1, … …, Xn) comprises an air inlet and an air outlet, characterized in that the air outlet of at least one printing color group (X1, … …, Xn) is communicated with a total exhaust duct (10) through an air outlet valve (K1, … …, Kn), the air outlet of at least one printing color group (X1, … …, Xn) is communicated with a total exhaust duct (20) through an air return valve (F1, … …, Fn), the air outlet of each printing color group (X1, … …, Xn) is at least communicated with the total exhaust duct (10) or the total exhaust duct (20), the air inlet of each printing color group (X1, … …, Xn) is communicated with the total exhaust duct (20), and the outlet of the total exhaust duct (10) is communicated with an exhaust gas treatment device.
2. The multicolor press air circulation system according to claim 1, wherein the air outlets of the respective print color groups (X1, … …, Xn) communicate through a header (30).
3. Multicolor press air circulation system according to claim 1, characterized in that the air outlet of each of said printing couples (X1, … …, Xn) communicates with the main exhaust duct (10) through an exhaust valve (K1, … …, Kn), and the air outlet of each of said printing couples (X1, … …, Xn) communicates with the main return duct (20) through an air return valve (F1, … …, Fn).
4. The multicolor press air circulation system according to any one of claims 1 to 3, further comprising a main circulation fan (MB), wherein the outlet of the main exhaust duct (10) is communicated with the inlet of the main circulation fan (MB), the outlet of the main circulation fan (MB) is communicated with an exhaust gas treatment device, and the concentration of VOCs at the inlet or the outlet of the main circulation fan (MB) is used for adjusting the air draft of the main circulation fan (MB).
5. The multicolor press air circulation system according to claim 4, further comprising a controller and a VOCs concentration measuring instrument disposed at the inlet or outlet of the main circulation fan (MB), wherein the controller is connected to the VOCs concentration measuring instrument and the main circulation fan (MB), and the controller is configured to control the draft amount of the main circulation fan (MB) according to the VOCs concentration detected by the VOCs concentration measuring instrument.
6. The multicolor press air circulation system according to claim 5, wherein the controller is preset with a first VOCs concentration threshold and a second VOCs concentration threshold, and is configured to control the operating frequency of the main circulation fan (MB) to be increased to increase the air draft of the main circulation fan (MB) when the VOCs concentration detected by the VOCs concentration measuring instrument is greater than the first VOCs concentration threshold; the controller is used for controlling the running frequency of the main circulating fan (MB) to be reduced when the concentration of the VOCs detected by the VOCs concentration measuring instrument is smaller than the second VOCs concentration threshold value so as to reduce the air draft of the main circulating fan (MB), and the second VOCs concentration threshold value is smaller than the first VOCs concentration threshold value.
7. The multicolor press air circulation system according to any one of claims 1 to 3, the air exhaust system is characterized in that n printing color groups (X1, … … and Xn) are sequentially arranged in parallel, the air exhaust port of the 1 st printing color group (X1) is communicated with a total air exhaust pipe (10) through a1 st exhaust valve (K1), the air exhaust port of the 1 st printing color group (X1) is communicated with a total air return pipe (20) through a1 st air return valve (F1), the air exhaust port of the 2 nd printing color group (X2) is communicated with the total air exhaust pipe (10) through a2 nd exhaust valve (K2), the air exhaust port of the 2 nd printing color group (X2) is communicated with the total air return pipe (20) through a2 nd air return valve (F2), … …, the air exhaust port of the n th printing color group (Xn) is communicated with the total air exhaust pipe (10) through an n th exhaust valve (Kn), and the air exhaust port of the n th printing color group (Xn) is communicated with the total air return pipe (20) through an n air return valve (Fn.
8. The multicolor press air circulation system according to any one of claims 1 to 3, wherein the print couple (X1, … …, Xn) comprises a first print couple (X1), the first print couple (X1) being further provided with a first air replenishment channel, on which a first air replenishment valve (D1) is provided.
9. The multicolor press air circulation system according to claim 8, wherein said first printing couple (X1) further comprises a first air control heat exchanger (H1) and a first printing oven tunnel (B1), the inlet of said first air control heat exchanger (H1) communicating simultaneously with the outlet of said first air replenishment valve (D1) and with the air inlet of said first printing couple (X1), the outlet of said first air control heat exchanger (H1) communicating with the inlet of said first printing oven tunnel (B1), the outlet of said first printing oven tunnel (B1) communicating with the air outlet of said first printing couple (X1).
10. The multicolor press air circulation system according to claim 9, wherein said first printing color group (X1) further comprises a first color group blower fan (C1), a first return air adjustment valve (a1) and a first exhaust air adjustment valve (E1), wherein an inlet of said first air control heat exchanger (H1) is simultaneously communicated with an outlet of said first air supplement valve (D1) and an inlet of said first printing color group (X1) through said first color group blower fan (C1), a first inlet of said first color group blower fan (C1) is connected with an inlet of said first printing color group (X1), a second inlet of said first color group blower fan (C1) is connected with an outlet of said first air supplement valve (D1), and an outlet of said first color group blower fan (C1) is connected with an inlet of said first air control heat exchanger (H1); the first air return adjustment valve (A1) is disposed between a first inlet of the first color group blower fan (C1) and an air inlet of the first print color group (X1); the outlet of the first printing drying tunnel (B1) is communicated with the air outlet of the first printing color group (X1) through a first air outlet regulating valve (E1).
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