CN108437623B - Gravure printing machine, drying system and control method thereof - Google Patents
Gravure printing machine, drying system and control method thereof Download PDFInfo
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- CN108437623B CN108437623B CN201810395183.XA CN201810395183A CN108437623B CN 108437623 B CN108437623 B CN 108437623B CN 201810395183 A CN201810395183 A CN 201810395183A CN 108437623 B CN108437623 B CN 108437623B
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- hot air
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- 238000001035 drying Methods 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000007646 gravure printing Methods 0.000 title claims abstract description 9
- 238000007639 printing Methods 0.000 claims description 62
- 239000002904 solvent Substances 0.000 claims description 42
- 238000001514 detection method Methods 0.000 claims description 29
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 230000001502 supplementing effect Effects 0.000 abstract description 3
- 238000005086 pumping Methods 0.000 abstract 1
- 238000004064 recycling Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 229910021536 Zeolite Inorganic materials 0.000 description 9
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 9
- 239000002808 molecular sieve Substances 0.000 description 9
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 9
- 239000010457 zeolite Substances 0.000 description 9
- 238000001914 filtration Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000010017 direct printing Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
- B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
- B41F23/044—Drying sheets, e.g. between two printing stations
- B41F23/0463—Drying sheets, e.g. between two printing stations by convection
- B41F23/0466—Drying sheets, e.g. between two printing stations by convection by using heated air
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
- B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
- B41F23/044—Drying sheets, e.g. between two printing stations
- B41F23/0443—Drying sheets, e.g. between two printing stations after printing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F33/00—Indicating, counting, warning, control or safety devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F9/00—Rotary intaglio printing presses
- B41F9/06—Details
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses a gravure printing machine, a drying system and a control method thereof. The drying system comprises a plurality of ovens, wherein the air outlet of each oven is connected with a main exhaust pipe, the air outlet of the previous oven is also connected with the air inlet of the next oven through an air pipe, a first fan for supplementing fresh air is arranged at the air inlet of each oven, and a second fan for pumping the hot air of the previous oven into the next oven is arranged on the air pipe; the drying system also comprises a control host machine for controlling the air quantity of the hot air flowing into the next oven from the previous oven by controlling the opening states of the first fans and the second fans. According to the invention, part of hot air heated in the previous oven is introduced into the next oven, so that the air quantity of the fresh air introduced into the next oven is reduced, the working efficiency is improved in a mode of recycling part of hot air, the energy consumption of the next oven is effectively reduced, and the production cost is greatly saved.
Description
Technical Field
The invention relates to the technical field of printing equipment, in particular to a gravure printing machine, a drying system and a control method thereof.
Background
Printing is a technique of transferring ink of an image-text part on a printing plate to a printing material such as paper by performing plate making, inking, pressurizing and other procedures on an original document such as characters and pictures, and copying the original document in batches. The common printing modes can be divided into four categories of relief printing, intaglio printing, lithographic printing and stencil printing according to the relative positions of the image-text area and the non-image-text area on the printing plate. During intaglio printing, the printing plate cylinder is inked on the whole page, the ink in the blank part of the page is scraped by a doctor blade, the ink in the image-text part is left, then the paper is passed through, the impression cylinder is used for impressing on the back surface of the paper, the ink in the concave part is directly transferred onto the paper surface, the ink on the paper is dried by an oven on equipment, and finally the printed matter is piled or rewound by a paper collecting part. The intaglio printing machine adopts a circular press-circular direct printing mode to print, and a printing plate is directly manufactured on a plate cylinder and is subjected to ink feeding by adopting an ink dipping or ink jet mode. Because of the thick ink layer, quick-drying ink with strong volatility is used, and a drying device is arranged on the gravure printing machine.
The existing drying device generally sets an oven at each printing color group of the printer, and after the paper is printed, the ink is directly heated by the corresponding oven to be dried, and then the paper is injected into the next working procedure. At present, an air inlet mode, an air outlet mode, an air speed control mode and the like of each oven are independently arranged, indoor fresh air is continuously input into an air inlet of each oven, the fresh air is heated into hot air through heating wires in the ovens, the hot air is used for drying ink on paper, and then the hot air is directly discharged through a main exhaust pipe. In the drying process, fresh air is required to be continuously input into each oven, the fresh air is heated to a set temperature for drying, however, the fresh air (namely, indoor fresh air) is heated to a temperature required by drying, a certain time is required, and a lot of energy (such as electric energy) is also required to be consumed, so that the drying speed is not matched with the printing speed, the production efficiency is low, the energy consumption is too high, and the energy saving is not facilitated.
There is thus a need for improvements and improvements in the art.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide a gravure printing machine, a drying system and a control method thereof, which can recycle heated gas, so as to save production cost and improve production efficiency.
In order to solve the technical problems, the invention adopts the following technical scheme:
The drying system of the intaglio printing press comprises ovens with the quantity corresponding to the printing color groups of the intaglio printing press, wherein the air outlets of each oven are connected with a main exhaust pipe through exhaust pipes, the air outlet of the previous oven is also connected with the air inlet of the next oven through an air pipe, a first fan for supplementing fresh air is arranged at the air inlet of each oven, and a second fan for sucking the hot air of the previous oven into the next oven is arranged on the air pipe; the drying system further comprises a control host machine for controlling the air quantity of the hot air flowing into the next oven from the previous oven by controlling the opening states of the first fans and the second fans, and the first fans and the second fans are connected with the control host machine;
An exhaust valve is arranged on an exhaust pipe of each oven, an air inlet valve for controlling the fresh air quantity is arranged at an air inlet of each oven, and the exhaust valve and the air inlet valve element are connected with a control host;
the air pipes are internally provided with detection devices for detecting the concentration of the solvent of the hot air, the detection devices are connected with a control host, and the control host controls the opening states of the air exhaust valve and the air inlet valve according to the detection result of the detection devices;
when the concentration of the solvent in the hot air reaches a preset value, the control host controls the exhaust valve to discharge part of the hot air to the total exhaust pipe, the rest hot air is introduced into the next oven through the second fan, and simultaneously, the opening state of the air inlet valve is controlled and the air quantity of the first fan introduced into the fan is increased so as to reduce the concentration of the solvent of the hot air entering the next oven; the wind speed of the second fan is obtained according to the following formula:
C＝Wp/△e
Wherein, C is the second fan wind speed, W is the drying speed, P is the drying ambient pressure, deltae is the difference between the solvent saturation concentration and the solvent concentration in the drying hot air, W is set in the control host according to the printing speed, deltae is calculated by the control host after the solvent concentration in the drying hot air is detected by the detection device, the safety threshold is set after the data of the second fan wind speed is calculated by the control host, and the power of the second fan is directly controlled in the safety threshold.
In the drying system of the intaglio printing press, the air knife assembly is arranged on the oven and comprises an air knife and an air knife rest for adjusting the angle of the air knife, and the air knife rest is electrically connected with the control host.
In the drying system of the intaglio printing press, the angle of the air knife is 45-75 degrees.
In the drying system of the intaglio printing press, a check valve for preventing the used air from flowing back is further arranged on the air pipe.
A control method of a drying system of a gravure printing machine, comprising the steps of:
A. introducing fresh air into the oven by a first fan of a first oven, and heating the fresh air by the oven to dry the printing stock;
B. Introducing hot gas into a next oven by a second fan of the first oven to enable the next oven to dry the printing stock;
C. the control host controls the air quantity of the hot air flowing into the next oven of the previous oven and the flow quantity of the fresh air introduced into each oven by controlling the opening states of each first fan and each second fan;
c1, controlling the opening states of an exhaust valve and an air inlet valve by a control host, and controlling the flow of hot air discharged by each oven and the flow of fresh air introduced into each oven;
The step C further comprises the following steps:
C2, detecting the solvent concentration of the hot air in the corresponding air pipe by each detection device;
C3, the control host controls the opening states of the exhaust valve and the air inlet valve according to the detection result of the detection device; when the concentration of the solvent in the hot air reaches a preset value, the control host controls the exhaust valve to discharge part of the hot air to the total exhaust pipe, the rest hot air is introduced into the next oven through the second fan, and simultaneously, the opening state of the air inlet valve is controlled and the air quantity of the first fan introduced into the fan is increased so as to reduce the concentration of the solvent of the hot air entering the next oven; the wind speed of the second fan is obtained according to the following formula:
C＝Wp/△e
Wherein, C is the second fan wind speed, W is the drying speed, P is the drying ambient pressure, deltae is the difference between the solvent saturation concentration and the solvent concentration in the drying hot air, W is set in the control host according to the printing speed, deltae is calculated by the control host after the solvent concentration in the drying hot air is detected by the detection device, the safety threshold is set after the data of the second fan wind speed is calculated by the control host, and the power of the second fan is directly controlled in the safety threshold.
The intaglio printing press comprises a plurality of printing color groups and further comprises the drying system, wherein each oven of the drying system is arranged on the upper side of the corresponding printing color group.
Compared with the prior art, the intaglio printing press, the drying system and the control method thereof provided by the invention have the advantages that the part of hot air heated in the previous oven is introduced into the next oven, so that the air quantity of the fresh air introduced into the next oven is reduced, the heating time of the fresh air is saved, the working efficiency is improved, the energy consumption of the next oven is effectively reduced, and the production cost is greatly saved.
Drawings
FIG. 1 shows a structure of a drying system according to a preferred embodiment of the present invention
Schematic diagram.
Fig. 2 is a flowchart of a control method of the drying system according to a preferred embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
It is noted that when an element is referred to as being "mounted," "secured," or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present.
It should be noted that, in the embodiments of the present invention, terms such as left, right, up, and down are merely relative concepts or references to normal use states of the product, and should not be construed as limiting.
Referring to fig. 1, the drying system of the intaglio printing press provided by the invention comprises ovens 1 with the number corresponding to the printing color groups of the intaglio printing press, wherein the air outlet of each oven 1 is connected with a main exhaust pipe 3 through an exhaust pipe 2, the air outlet of the previous oven 1 is also connected with the air inlet of the next oven 1 through an air pipe 4, a first fan 5 for supplementing fresh air is arranged at the air inlet of each oven 1, and a second fan 6 for sucking the hot air of the previous oven 1 into the next oven 1 is arranged on the air pipe 4; the drying system further comprises a control host (not shown in the figure) for controlling the opening states of the first fans 5 and the second fans 6 to control the hot air of the previous oven 1 to flow into the next oven 1, the first fans 5 and the second fans 6 are connected with the control host, the opening or closing states of the first fans 5 and the second fans 6 and the wind speed of each fan are controlled by the control host, so that part of the hot air heated in the previous oven 1 flows into the next fan, the hot air is recycled, the heating time of cold air (namely fresh air) is saved, the production efficiency is improved, the energy consumption of the subsequent oven 1 is reduced, and the production cost is greatly saved.
Specifically, the oven 1 includes a hollow box (not shown in the figure), in which a plurality of heating pipes (not shown in the figure) are disposed, and the heating temperature of the heating pipes is controlled, so that the fresh air heating time can be controlled.
A third fan 7 is arranged at one end of the main exhaust pipe 3 to exhaust the exhaust gas in the main exhaust pipe 3. In this embodiment, the first fan 5, the second fan 6, and the third fan 7 may all be variable frequency fans, and the power of the variable frequency fans is directly controlled by the control host.
Furthermore, a filtering device (not shown) may be disposed at one side of the third fan 7 to filter the exhaust gas, so as to reduce the problem of exhaust gas pollution.
In addition, the invention can recycle the discharged hot air, recycle the solvent volatilized by heating in the ink, and recycle the solvent, thereby further saving the cost and preventing pollution.
With continued reference to fig. 1, as the concentration of the solvent in the hot air output by the subsequent-stage oven is higher and higher, the utilization rate of the hot air is gradually reduced, the invention adopts the structure that the exhaust pipes 2 of each oven 1 are provided with the exhaust valves 8, the air inlets of each oven 1 are provided with the air inlet valves 9 for controlling the air quantity of the fresh air, the exhaust valves 8 and the air inlet valves 9 are connected with the control host, the control host is used for exhausting part of the utilized hot air through the opening degree of the exhaust valves 8, and the control host is used for controlling the air quantity of the fresh air introduced by the first fan 5 according to the air quantity of the hot air introduced by the second fan 6 so as to achieve the purpose of drying the printing material.
Preferably, a detecting device (not shown in the figure) for detecting the solvent concentration of the hot air is disposed in each air pipe 4, the detecting device is connected with a control host, the control host controls the opening states (the opening states include opening, closing, opening degree and the like) of the air exhaust valve 8 and the air intake valve 9 according to the detection result of the detecting device, when the solvent concentration in the hot air approaches or reaches a preset value, the control host controls the air exhaust valve 8 to discharge part of the hot air to the total air exhaust pipe 3, the rest of the hot air is introduced into the next oven through the second fan, and simultaneously, the opening state of the air intake valve 9 (specifically, the opening degree of the air intake valve 9 is increased) is controlled again, and the air quantity of the first fan 5 introduced into the fan is increased, so that the solvent concentration of the hot air entering the next oven 1 is reduced, part of the hot air energy in the previous oven 1 is reused, and the heat in the oven can meet the drying requirement.
In this embodiment, the wind speed of the second fan is obtained according to the following formula:
C＝Wp/△e
Wherein, C is the second fan wind speed, W is the drying speed, P is the drying ambient pressure, deltae is the difference between the solvent saturation concentration and the solvent concentration in the drying hot air, W is set in the control host according to the printing speed, deltae is calculated by the control host after the solvent concentration in the drying hot air is detected by the detection device, the safety threshold is set after the data of C is calculated by the control host, and the power of the second fan is directly controlled within the safety threshold. The second fan is a fan at the input side of the corresponding detection device, namely the second fan which introduces the heat of the oven of the last group of printing color groups. After the wind speed of the second fan is determined, the control host calculates the wind speed of the first fan 5 of the oven for printing the color group of the group, thereby realizing intelligent regulation and improving the intelligent degree of the drying system.
Further, a connection pipe 11 for connecting the filter device is arranged on the air pipe 4 between the ovens, and a control valve 12 is arranged on the connection pipe 11. In the drying system of the intaglio printing press according to the present invention, the filter device may also be selectively connected according to the solvent concentration value of each air duct. In this embodiment, the filtering device preferably adopts zeolite molecular sieve, and compared with the activated carbon adsorption tower, the filtering device has the characteristics of strong adsorption capacity, stable adsorption performance, good desorption performance, convenient replacement and the like.
In specific implementation, the detection device detects the solvent concentration value on each air pipe 4 and feeds back the solvent concentration value to the control host, when the control host judges that the solvent concentration value reaches a set value, an alarm signal is output, the connection pipe 11 on the air pipe 4 at the output side of the corresponding oven 1 is prompted to be connected with the zeolite molecular sieve, and the control valve 12 is controlled to be opened, so that the zeolite molecular sieve adsorbs the solvent concentration of hot air output by the oven 1.
Further, the control host can also judge whether the zeolite molecular sieve reaches saturation according to the concentration value of the solvent obtained by the detection device on the air pipe at the output side of the upper-stage oven of the zeolite molecular sieve, and output an alarm signal to prompt whether the zeolite molecular sieve needs to be replaced or not when the zeolite molecular sieve is saturated.
Preferably, the control host can also calculate the number of zeolite molecular sieves to be connected to the drying system and the positions of the zeolite molecular sieves according to the solvent concentration values obtained by the detection devices, so that the equipment cost is saved to the greatest extent, and the utilization rate, the working efficiency, the electric energy consumption and the like of hot air are improved.
Further, when the control host outputs the alarm signal, the detailed internal part of the alarm signal is sent to the bound mobile phone, so that the staff can timely process the alarm event.
Further, an air knife assembly (not shown in the figure) is arranged on the oven 1, the air knife assembly comprises an air knife (not shown in the figure) and an air knife rest (not shown in the figure) for adjusting the angle of the air knife, the air knife rest is electrically connected with a control host, and the angle of the air knife is adjusted according to the requirement through the control host so as to achieve the purpose of rapidly drying the printing material. More specifically, the angle of the air knife is 45-75 degrees, so that the printing ink on the printed matter is quickly dried, and the printing quality is not affected.
Further, a check valve 10 for preventing the back flow of the used air is further provided on the air duct 4 to prevent the back flow of the heated air into the oven 1.
Furthermore, the air pipe 3 can also be connected with an air inlet of the first color set (not shown in the figure), so that the air quantity of the fresh air introduced by the first fan 5 of the first color set can be reduced, and the energy is further saved.
In a further embodiment, in the drying system of the intaglio printing press of the present invention, a water pipe may be disposed at the output side of the main exhaust pipe, cold water is introduced into the water pipe, hot air output from the main exhaust pipe heats the cold water, and the heated hot water can be used for supplying domestic water (such as bath water) to equipment, boilers and factory workers to be heated, so as to utilize heat to the maximum extent. In this embodiment, the outer wall of the water pipe is provided with an anti-corrosion coating, so that the water pipe is prevented from being corroded by the solvent in the hot air output by the main exhaust pipe.
In still further embodiments, after the water supply pipe of the main exhaust pipe is heated, an electrostatic fan may be further disposed at the output side of the main exhaust pipe, the electrostatic fan may adsorb particulate matters in the hot air, and then the hot air passes through a flue of a factory, and heat is also utilized to heat the factory in winter, so that air pollution caused by coal burning may be reduced, and further heat utilization is realized.
Based on the above drying system, the present invention further provides a control method of a drying system of an intaglio printing press, referring to fig. 2, which includes the following steps:
S100, introducing fresh air into the oven by a first fan of a first oven, and heating the fresh air by the oven to dry a printing stock;
s200, introducing hot gas into a next oven by a second fan of the first oven to enable the next oven to dry the printing stock;
S300, controlling the opening states of the first fans and the second fans by the control host to control the air quantity of the hot air flowing into the next oven from the previous oven and the flow quantity of the fresh air introduced into the ovens.
The step S300 further includes:
S301, controlling the opening states of the exhaust valve and the air inlet valve by a control host, and controlling the flow of hot air discharged by each oven and the flow of fresh air introduced into each oven.
In the control method, before the operation in step S300, the method further includes:
S302, detecting the solvent concentration of hot air in the corresponding air pipe by each detection device;
S303, the control host controls the opening states of the exhaust valve and the air inlet valve according to the detection result of the detection device.
Wherein, the step S303 further includes: and the control host controls the power of the second fan according to the detection result of the detection device, so as to control the wind speed flowing into the next oven.
Preferably, the present invention also provides a gravure printing press (not shown in the figures) comprising a plurality of printing groups (not shown in the figures) and the drying system described above, each oven of the drying system being arranged on the upper side of a respective printing group. After the patterns are transferred to each printing color group, the printing stock is directly dried by a corresponding oven. Since the drying system has been described in detail above, it will not be described in detail here.
Compared with the prior art, the method has the following beneficial effects: according to the invention, part of hot air heated in the previous oven is introduced into the next oven, so that the air quantity of fresh air introduced into the next oven is reduced, the wind energy in the next oven can quickly reach the temperature required by drying, the heating time in each oven is shortened, and the drying efficiency is greatly improved.
It will be understood that equivalents and modifications will occur to those skilled in the art in light of the present invention and their spirit, and all such modifications and substitutions are intended to be included within the scope of the present invention as defined in the following claims.
Claims (6)
1. The drying system of the intaglio printing press comprises ovens with the quantity corresponding to the printing color groups of the intaglio printing press, wherein the air outlets of each oven are connected with a main exhaust pipe through exhaust pipes; the drying system further comprises a control host machine for controlling the air quantity of the hot air flowing into the next oven from the previous oven by controlling the opening states of the first fans and the second fans, and the first fans and the second fans are connected with the control host machine;
An exhaust valve is arranged on an exhaust pipe of each oven, an air inlet valve for controlling the fresh air quantity is arranged at an air inlet of each oven, and the exhaust valve and the air inlet valve element are connected with a control host;
The air pipe is internally provided with a detection device for detecting the concentration of the solvent of the hot air, the detection device is connected with a control host, and the control host controls the opening states of the air exhaust valve and the air inlet valve according to the detection result of the detection device;
when the concentration of the solvent in the hot air reaches a preset value, the control host controls the exhaust valve to discharge part of the hot air to the total exhaust pipe, the rest hot air is introduced into the next oven through the second fan, and simultaneously, the opening state of the air inlet valve is controlled and the air quantity of the first fan introduced into the fan is increased so as to reduce the concentration of the solvent of the hot air entering the next oven; the wind speed of the second fan is obtained according to the following formula:
C＝Wp/△e
Wherein, C is the second fan wind speed, W is the drying speed, P is the drying ambient pressure, deltae is the difference between the solvent saturation concentration and the solvent concentration in the drying hot air, W is set in the control host according to the printing speed, deltae is calculated by the control host after the solvent concentration in the drying hot air is detected by the detection device, the safety threshold is set after the data of the second fan wind speed is calculated by the control host, and the power of the second fan is directly controlled in the safety threshold.
2. The drying system of intaglio printing press according to claim 1, wherein an air knife assembly is provided on said oven, said air knife assembly comprising an air knife and an air knife rest for adjusting the angle of the air knife, said air knife rest being electrically connected with a control host.
3. Drying system of a intaglio printing press according to claim 2, wherein the angle of said air knives is 45-75 degrees.
4. The drying system of intaglio printing press according to claim 1, wherein said air duct is further provided with a check valve preventing the back flow of used air.
5. A control method of a drying system of a gravure printing machine, characterized by comprising the steps of:
A. introducing fresh air into the oven by a first fan of a first oven, and heating the fresh air by the oven to dry the printing stock;
B. Introducing hot gas into a next oven by a second fan of the first oven to enable the next oven to dry the printing stock;
C. the control host controls the air quantity of the hot air flowing into the next oven of the previous oven and the flow quantity of the fresh air introduced into each oven by controlling the opening states of each first fan and each second fan;
The step C further comprises the following steps:
c1, controlling the opening states of an exhaust valve and an air inlet valve by a control host, and controlling the flow of hot air discharged by each oven and the flow of fresh air introduced into each oven;
before the operation of the step C, the method further comprises the following steps:
C2, detecting the solvent concentration of the hot air in the corresponding air pipe by each detection device;
C3, the control host controls the opening states of the exhaust valve and the air inlet valve according to the detection result of the detection device; when the concentration of the solvent in the hot air reaches a preset value, the control host controls the exhaust valve to discharge part of the hot air to the total exhaust pipe, the rest hot air is introduced into the next oven through the second fan, and simultaneously, the opening state of the air inlet valve is controlled and the air quantity of the first fan introduced into the fan is increased so as to reduce the concentration of the solvent of the hot air entering the next oven; the wind speed of the second fan is obtained according to the following formula:
C＝Wp/△e
Wherein, C is the second fan wind speed, W is the drying speed, P is the drying ambient pressure, deltae is the difference between the solvent saturation concentration and the solvent concentration in the drying hot air, W is set in the control host according to the printing speed, deltae is calculated by the control host after the solvent concentration in the drying hot air is detected by the detection device, the safety threshold is set after the data of the second fan wind speed is calculated by the control host, and the power of the second fan is directly controlled in the safety threshold.
6. Intaglio printing press comprising several printing groups, characterized in that it further comprises a drying system according to any of the preceding claims 1-4, each oven of said drying system being arranged on the upper side of the respective printing group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810395183.XA CN108437623B (en) | 2018-04-27 | 2018-04-27 | Gravure printing machine, drying system and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810395183.XA CN108437623B (en) | 2018-04-27 | 2018-04-27 | Gravure printing machine, drying system and control method thereof |
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| CN108437623A CN108437623A (en) | 2018-08-24 |
| CN108437623B true CN108437623B (en) | 2024-05-28 |
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