Printing press ink intelligent control system

Abstract

An intelligent control system for printing ink can realize automatic ink dispensing and adding according to viscosity set values, pre-adjustment of viscosity, stirring of raw ink, automatic cleaning of pipelines, recording of usage and real-time calculation of ink consumption by substrate area. The control system comprises a compressed air source, a solenoid valve group, a central controller, a weighing container, a raw ink barrel, a solvent barrel, a circulating barrel of the printing press and an ink supply circulation system. The solvent barrel and the raw ink barrel are connected to the weighing container via a pneumatic straight-through valve 1, a pneumatic three-way valve 1, a pump 1, a pneumatic three-way valve 3, a three-way valve 2 and a pneumatic three-way valve 4 to form a solvent and raw ink pumping system; the compressed air source, a manual pressure regulating valve, a weighing container and a pneumatic three-way valve 4 are connected to the circulating barrel of the printing press to form a solvent and raw ink adding and viscosity control system; the pneumatic three-way valve 4 is connected to the ink supply circulation system 1 via a three-way valve 2 and a pneumatic three-way valve 2; the three-way valve 2 is connected to the raw ink pipeline and the raw ink barrel via a pneumatic three-way valve 3, a three-way valve 1, a raw ink pipeline and a raw ink barrel to form a raw ink stirring and raw ink pipeline cleaning system.

Description

Technical Field

[0001] The present invention relates to a printing ink control system, in particular to a printing ink intelligent control system. Background Art

[0002] Traditionally, ink for gravure printing presses is manually transported to the workshop for mixing, use, and management. This is due to factors such as the volatility of the solvent, color variations caused by repeated ink recycling, and the shallowing of the V-shaped holes in the printing plates due to prolonged high-speed scraping of the scraper during printing. This results in a gradual decrease in ink consumption per substrate, leading to variations in ink consumption between the front and back sections of the substrate. This can lead to color variations and quality issues. This problem is particularly prominent when printing high-end products, thus impacting product quality. Manual experience or ink viscosity controllers alone are unable to address these quality issues caused by factors such as color variation and shallow V-shaped holes in the printing plates. An ink viscosity controller is a device used to control ink viscosity. It consists of a compressed air source, a pneumatic diaphragm pump, a base ink tank, a solvent tank, and a control valve. The basic principle is to manually adjust the ink viscosity to the target value. Then, utilizing the height difference between the ink tank and the recirculation tank, ink is pumped from the recirculation tank into the ink tank. When the ink tank is full, the ink is returned to the recirculation tank for recirculation. During the recycling process, tracking ink viscosity by tracking the operating frequency of the pneumatic diaphragm pump, motor speed, or vibration frequency is limited to simple, close-range tracking of viscosity for a single, single-color printer. Measures such as ink addition, equipment cleaning, color content reduction, and reduced area ink consumption due to shallower V-shaped holes in the printing plate rely on manual experience. CN208789263U discloses a printing press ink viscosity control device and a printing press using the device. The device includes a viscosity detection device comprising a sampling structure, a sample container, and a photoelectric detection device. The sampling structure includes a sampling pump for delivering ink to the sample container, the sample container having a sample outflow port, and the photoelectric detection device includes a photoelectric sensor for detecting the outflow time of the sample ink. The device also includes a feeding device comprising a feeding pump and a feeding conduit connected between the raw material tank and the ink tank. The feeding conduit includes an ink conduit and a solvent conduit, both of which are connected to the feeding pump. The ink tank is connected to a circulation tank, and the sampling structure and feeding device are indirectly connected to the ink tank via the circulation tank. The feeding device also includes a weighing container, the outlet of the feeding pump is connected to the weighing container, and the outlet of the weighing container is connected to the circulation tank. The controller has a set value for ink viscosity. The viscosity detection device is connected to the controller for signal communication, and the controller is connected to the feeding device for control. During operation, the controller compares the detection value with the set value and controls the feeding device to add ink or solvent to the ink tank to achieve the purpose of automatically controlling the ink viscosity.

[0003] (1) There is no remote control function, which means that the equipment can only be used at close range and cannot be installed in warehouses or remote places. It is impossible to extend the ink supply pipeline to achieve automatic supply of ink and solvent over long distances without human intervention to help companies solve the problems of wasting labor and safety hazards such as collisions between transport containers and static sparks when manually transporting ink and solvent to the workshop.

[0004] (2) Without the automatic ink adding function that replenishes new ink in small amounts and multiple times and the accurate area ink consumption calculation function, it is impossible to control two of the three main factors that cause color difference quality problems in the printing process: the decrease in color content and the decrease in area ink consumption caused by the shallowing of the V-shaped holes in the printing plate.

[0005] (3) There is no viscosity pre-adjustment function. After the printing press changes the printing plate, it is impossible to pre-adjust the ink viscosity according to the quality requirements of different products, thereby saving time and reducing the production of defective products during the viscosity adjustment process.

[0006] (4) There is no automatic cleaning function for the original ink pipeline. When changing colors, cleaning is required, which is cumbersome and wastes labor and solvents. Summary of the Invention

[0007] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide an intelligent control system for printing ink that can realize remote control, automatic ink mixing and adding according to the viscosity set value, pre-adjustment of viscosity, original ink stirring and automatic cleaning of pipelines, recording of usage and real-time calculation of ink consumption of the printing substrate area.

[0008] The technical solution of the present invention is: an intelligent control system for printing ink, including a compressed air source, a total air pressure valve, a solenoid valve group, a central controller, a weighing container, a raw ink barrel, a solvent barrel, a printing press circulation barrel with a built-in low limit liquid level sensor, a weighing module connected between the weighing container and the central controller, and an ink supply circulation system consisting of a pneumatic three-way valve, a second pump, a printing press viscosity detection device, a printing press ink supply pipeline, a printing press ink tank, and a printing press circulation pipeline connected to the printing press circulation barrel. The special features of the control system are:

[0009] It also includes a pneumatic straight-through valve 1, a pneumatic three-way valve 1, a pneumatic three-way valve 3, a pneumatic three-way valve 4, a three-way valve 1, a three-way valve 2 and a pump 1; the solvent barrel is connected to the weighing container via the solvent pipeline, the pneumatic straight-through valve 1, the pneumatic three-way valve 1, the pump 1, the pneumatic three-way valve 3, the three-way valve 2, and the pneumatic three-way valve 4 to form a solvent pumping system with a weighing function, and the raw ink barrel is connected to the weighing container via the raw ink pipeline, the three-way valve 1, the pneumatic three-way valve 1, the pump 1, the pneumatic three-way valve 3, the three-way valve 2, and the pneumatic three-way valve 4 to form a raw ink pumping system with a weighing function;

[0010] The compressed air source, the total air pressure valve, the manual pressure regulating valve, the weighing container, the pneumatic three-way valve and the circulation barrel of the printing press are sequentially connected through pipelines to form a solvent and raw ink addition and viscosity control system. By extending the compressed air injection time, the solvent or raw ink and the ink in the circulation barrel of the printing press are evenly mixed under the action of the compressed air. The operator only needs to change the viscosity setting value to achieve automatic ink addition according to the viscosity setting value, arbitrarily increase or decrease the viscosity, and thus achieve the purpose of controlling the viscosity of the ink in the circulation barrel.

[0011] The compressed air source, the total air pressure valve, the manual pressure regulating valve, the weighing container, the pneumatic three-way valve four, the three-way valve two, and the pneumatic three-way valve two are connected to the ink supply circulation system one to realize the automatic cleaning function of the internal circulation detection part of the printing machine one;

[0012] The compressed air source, total air pressure valve, manual pressure regulating valve, weighing container, pneumatic three-way valve four, three-way valve two, pneumatic three-way valve three, three-way valve one, raw ink pipeline and raw ink barrel are connected in sequence to form a raw ink stirring and raw ink pipeline cleaning system, realizing the raw ink stirring and raw ink pipeline cleaning functions.

[0013] Furthermore, there is at least one ink supply circulation system 2 with the same structure as the ink supply circulation system 1. The compressed air source, manual pressure regulating valve, and weighing container are connected to the printing press circulation barrel through the pneumatic three-way valve for realizing the pipeline switching function, the pneumatic three-way valve 10 and the three-way valve 5 in the ink supply circulation system 2 with the same connection structure as the pneumatic three-way valve 2, so as to realize the function of automatic long-distance ink supply circulation for multiple printing presses with the same viscosity.

[0014] Furthermore, there is at least one ink supply circulation system 2 with the same structure as the ink supply circulation system 1 and a second circulation barrel of the printing press with built-in high and low limit liquid level sensors corresponding to each ink supply circulation system 2. The connection structure between the ink supply circulation system 2 and the second circulation barrel of the printing press is the same as the connection structure between the ink supply circulation system 1 and the first circulation barrel of the printing press. The compressed air source, manual pressure regulating valve, and weighing container are connected to the corresponding second circulation barrel solvent raw ink addition and viscosity control system 2 of the printing press through a pneumatic three-way valve for realizing the pipeline switching function, and are connected to the ink supply circulation system 2 through a pneumatic three-way valve 10 in the ink supply circulation system 2 with the same connection structure as the pneumatic three-way valve 2, so as to realize the automatic cleaning function of the internal circulation detection part of the second printing press. By adding a pneumatic three-way valve to the discharge pipe of the weighing container to change the discharge direction of the weighing container, the function of automatic ink supply circulation with different viscosities for multiple printing presses at the same time over a long distance is realized through multiple groups of ink supply circulation systems.

[0015] Furthermore, a dual-channel filter funnel is provided in a circulation barrel of the printing press, the inlet of the ink supply circulation system is connected to the circulation barrel of the printing press through the first channel of the filter funnel, and the outlet of the solvent raw ink addition and viscosity control system is connected to the circulation barrel of the printing press through the second channel of the filter funnel.

[0016] Furthermore, a double-channel filter funnel 2 is set in the second circulation barrel of the printing press, and the second inlet of the ink supply circulation system is connected to the second circulation barrel of the printing press through the first channel of the filter funnel 2, and the second outlet of the solvent raw ink addition and viscosity control system is connected to the second circulation barrel of the printing press through the second channel of the filter funnel 2.

[0017] Furthermore, the ink supply circulation system 1 is further provided with a pneumatic three-way valve 5, a pneumatic three-way valve 6, a pneumatic three-way valve 7, a three-way valve 3, and a pump 3. The pneumatic three-way valve 6 and the pneumatic three-way valve 7 are connected in series in the ink supply pipeline of the printing press 1, the pneumatic three-way valve 5 and the pump 3 are connected in series in the circulation pipeline of the printing press 1, the A and B ports of the three-way valve 3 are connected between the C port of the pneumatic three-way valve 7 and the C port of the pneumatic three-way valve 5, and the C port of the pneumatic three-way valve 6 is connected to the C port of the three-way valve 3, thereby realizing remote ink supply and ink collection functions and viscosity pre-adjustment functions. The long-distance automatic ink supply and ink collection in a sealed state and the idle state of the pipeline after the ink is collected after work are resolved. This solves the production safety and fire safety hazards such as sparks, static sparks, and pipeline leakage caused by the collision of transport containers when enterprises manually transport ink solvents or transport ink solvents using traditionally installed pipelines.

[0018] Furthermore, the ink supply circulation system 2 is also provided with a pneumatic three-way valve 11, a pneumatic three-way valve 12, a pneumatic three-way valve 13, a three-way valve 4 and a pump 5. The pneumatic three-way valve 11 and the pneumatic three-way valve 12 are connected in series in the ink supply pipeline of the printing press 2, the pneumatic three-way valve 13 and the pump 5 are connected in series in the circulation pipeline of the printing press 2, the A and B ports of the three-way valve 4 are connected between the C port of the pneumatic three-way valve 12 and the C port of the pneumatic three-way valve 13, and the C port of the pneumatic three-way valve 11 is connected to the C port of the three-way valve 4, realizing the long-distance ink supply and ink collection function and the viscosity pre-adjustment function.

[0019] Furthermore, a high limit liquid level sensor connected to the central controller is set in a circulation barrel of the printing machine. When the ink level in the circulation barrel of the printing machine reaches the high limit of the liquid level sensor, an alarm is issued to prompt that the circulation barrel may be full of ink and overflow.

[0020] Furthermore, a high limit liquid level sensor is set in the second circulation barrel of the printing machine. When the ink level in the second circulation barrel of the printing machine reaches the high limit of the liquid level sensor, an alarm is issued to prompt that the circulation barrel may be full of ink and overflow.

[0021] Furthermore, the pneumatic three-way valve for realizing the pipeline switching function includes a pneumatic three-way valve eight and a pneumatic three-way valve nine. The pneumatic three-way valve eight and the pneumatic three-way valve four are connected in series between the weighing container and the circulation barrel of the printing press one. The C port of the pneumatic three-way valve eight is connected to the circulation barrel of the printing press two through the pneumatic three-way valve nine. The C port of the pneumatic three-way valve nine is connected to the C port of the pneumatic three-way valve ten in the ink supply circulation system two, which has the same structure as the pneumatic three-way valve two.

[0022] The beneficial effects of the present invention are as follows: the intelligent control system for printing ink features remote control, real-time online viscosity detection and long-distance ink circulation, pre-adjusted viscosity, and automatic ink addition. These functions work together to instantly display the viscosity value that matches the Zahn cup. Before printing, by enabling the pre-adjusted viscosity function and changing the viscosity setting, the viscosity can be increased or decreased arbitrarily. By adjusting the viscosity to the target value in advance, optimal viscosity printing is achieved to control color quality and conserve ink. When printing multiple batches from the same plate set, viscosity can be managed digitally by setting the same viscosity as the previous print run. This reduces color difference and quality issues caused by unstable viscosity or inconsistent viscosity across multiple print batches.

[0023] When the low limit liquid level sensor of the circulation barrel sends a signal, the system automatically mixes ink and adds it to the circulation barrel according to the viscosity setting value. The ink in the circulation barrel is transported to the ink tank of the printing press through a long-distance ink supply circulation pipeline for use by the printing press. This realizes the ink circulation with adjusted viscosity from the enterprise warehouse directly to the printing press in the workshop without manual intervention, thus saving labor and ink. Compared with the traditional circulation method of exposed backflow into the circulation barrel, the circulation in a sealed state reduces pollution to the environment.

[0024] This intelligent ink control system for this printing press also features usage recording, area ink consumption calculation, viscosity control, and automatic ink addition to accurately control viscosity and minimize color variations caused by viscosity fluctuations. The automatic ink addition function, which continuously adds small amounts of new ink, mitigates the increased manual workload associated with frequent ink mixing, necessitating the simultaneous mixing of large quantities of ink and repeated reuse. This can lead to color variations in the second half of the ink due to the gradual decrease in masterbatch content. The usage recording and area ink consumption calculation functions provide real-time online calculation and instant display of area ink consumption. During the printing process, prolonged, high-speed scraping of the scraper against the printing plate causes the V-shaped holes in the plate to become shallower, resulting in a decrease in area ink consumption, indicating a color change. By adjusting viscosity to maintain consistent area ink consumption, the color variations caused by this decrease in area ink consumption can be mitigated. This also facilitates cost accounting and helps monitor usage to understand quality differences between different brands of ink solvents. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a system structure diagram of the first embodiment of the present invention;

[0026] Figure 2 is a system structure diagram of embodiment 2 of the present invention;

[0027] Figure 3 is a system structure diagram of embodiment 3 of the present invention;

[0028] Figure 4is a system structure diagram of the fourth embodiment of the present invention;

[0029] Figure 5 is a system structure diagram of the fifth embodiment of the present invention;

[0030] Figure 6 This is a system structure diagram of embodiment 6 of the present invention.

[0031] In the figure: compressed air source-1, oil-water separation total air pressure valve-2, circulating air pressure valve meter-3, solenoid valve group-4, manual pressure regulating valve-5, one-way check valve-6, weighing container-7, pneumatic three-way valve eight-8, pneumatic three-way valve four-9, pneumatic three-way valve nine-10, three-way valve two-11, pneumatic three-way valve three-12, pump one-13, pneumatic three-way valve one-14, three-way valve one-15, pneumatic straight-through valve one- 16. Raw ink pipeline - 17, solvent pipeline - 18, printing press - viscosity detection device - 19, pneumatic three-way valve six - 20, pneumatic three-way valve seven - 21, three-way valve three - 22, pneumatic three-way valve five - 23, pump three - 24, printing press - ink supply pipeline - 25, printing press - ink tank - 26, printing press - circulation pipeline - 27, printing press - wireless auxiliary screen - 28, printing press - circulation barrel - 29, pneumatic three-way valve 11-30, pneumatic three-way valve 12-31, three-way valve 4-32, pneumatic three-way valve 13-33, pump 5-34, pump 4-35, pneumatic three-way valve 10-36, printing press second circulation barrel-37, printing press second ink supply pipe-38, printing press second circulation pipe-39, printing press second ink tank-40, printing press second wireless sub-screen-41, printing press second viscosity detection device-42, filter funnel 1-43, filter funnel 2-44, solvent barrel-45, raw ink barrel-46, pump 2-47, pneumatic three-way valve 2-48, weighing module-49, central controller-50, touch screen-51, alarm-52, pneumatic exhaust valve-53, printing press first chassis-54, low limit liquid level sensor-55, high limit liquid level sensor-56, weight sensor-57, constant temperature device-58, three-way valve 5-59. DETAILED DESCRIPTION

[0032] The present invention will be described in detail below with reference to the accompanying drawings and examples. The following description is merely a specific embodiment of the present invention and is not intended to limit the present invention. It will be apparent to those skilled in the art that various modifications and variations are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

[0033] Example 1

[0034] like Figure 1As shown, an intelligent control system for printing ink includes a compressed air source 1, a total air pressure valve consisting of an oil-water separation total air pressure valve 2 and a circulating air pressure valve table 3, a solenoid valve group 4, a manual pressure regulating valve 5, a one-way check valve 6, a weighing container 7 with a pneumatic exhaust valve 53, a weighing module 49, a central controller (PLC) 50, a touch screen 51, an alarm 52, a pump 13, a raw ink barrel 46, a solvent barrel 45, a pneumatic three-way valve 14, a pneumatic three-way valve 2 48, a pneumatic three-way valve 3 12, a pneumatic three-way valve 4 9, a three-way valve 1 15, a three-way valve 2 11, a printing machine chassis 54 and a printing machine wireless sub-screen 28. A weight sensor 57 is provided on the top (or bottom) of the weighing container 7. An ink supply circulation system is composed of a printing press circulation barrel 29, a pneumatic three-way valve 48, a pump 47, a printing press viscosity detection device 19, a printing press ink supply pipe 25, a printing press ink tank 26 and a printing press circulation pipe 27, which are externally arranged outside the chassis 54.

[0035] The solvent barrel 45 is connected to the weighing container 7 via the solvent pipeline 18, pneumatic straight-through valve 16, pneumatic three-way valve 14, pump 13, pneumatic three-way valve 3 12, three-way valve 2 11, and pneumatic three-way valve 7 9 to form a solvent pumping system with a weighing function, and the raw ink barrel 46 is connected to the weighing container 7 via the raw ink pipeline 17, three-way valve 15, pneumatic three-way valve 14, pump 13, pneumatic three-way valve 3 12, three-way valve 2 11, and pneumatic three-way valve 4 9 to form a raw ink pumping system with a weighing function.

[0036] The compressed air source 1, the oil-water separation total air pressure valve 2, the circulating air pressure valve meter 3, the manual pressure regulating valve 5, the one-way check valve 6, the weighing container 7, the pneumatic three-way valve 49 and the printing press circulation barrel 29 are connected in sequence through pipelines to form a solvent and original ink addition and viscosity control system 1; by extending the compressed air injection time (to the PLC setting), the solvent or original ink and the ink in the built-in printing press circulation barrel are mixed evenly under the action of compressed air. The operator only needs to change the viscosity setting value to achieve automatic ink addition according to the viscosity setting value, arbitrarily increase or decrease the viscosity, and thus achieve the purpose of controlling the viscosity of the ink in the circulation barrel.

[0037] The compressed air source 1, the oil-water separation total air pressure valve 2, the circulating air pressure valve meter 3, the manual pressure regulating valve 5, the one-way check valve 6, the weighing container 7, the pneumatic three-way valve 4 9, the three-way valve 2 11, the pneumatic three-way valve 3 12, the three-way valve 1 15, the raw ink pipeline 17 and the raw ink barrel 46 are connected in sequence to form a raw ink stirring and raw ink pipeline cleaning system to achieve the raw ink stirring and raw ink pipeline cleaning functions;

[0038] The compressed air source 1, the oil-water separation total air pressure valve 2, the circulating air pressure valve meter 3, the manual pressure regulating valve 5, the one-way check valve 6, the weighing container 7, the pneumatic three-way valve 4 9, and the three-way valve 2 11 are connected to the ink supply circulation system 1 through the pneumatic three-way valve 2 48 to realize the automatic cleaning function of the internal circulation detection part of the printing machine 1.

[0039] A low limit liquid level sensor 55 is set in a circulation barrel 29 of the printing press, and a circulation method of the height difference between the ink tank and the circulation barrel is used to realize automatic ink supply for a simple single printing press.

[0040] A dual-channel filter funnel 1 43 is provided in the printing press circulation barrel 29 , and a pneumatic three-way valve 2 48 and a pneumatic three-way valve 4 9 are connected to the printing press circulation barrel 29 via the first channel and the second channel of the filter funnel 1 43 respectively.

[0041] This structure can realize the functions of automatic ink supply and circulation for a single printing press at a long distance by extending the length of the ink supply pipe and the circulation pipe.

[0042] Example 2

[0043] like Figure 2 As shown, the pneumatic three-way valve 3 12 is arranged between the weighing container 7 and the pneumatic three-way valve 4 9, and the rest is the same as that of embodiment 1.

[0044] Example 3

[0045] like Figure 3As shown, an intelligent control system for printing ink includes: a compressed air source 1, a total air pressure valve composed of an oil-water separation total air pressure valve 2 and a circulating air pressure valve table 3, a solenoid valve group 4, a manual pressure regulating valve 5, a one-way check valve 6, a weighing container 7 with a pneumatic exhaust valve 53, a weighing module 49, a central controller 50, a touch screen 51, an alarm 52, a pump 13, a raw ink barrel 46, a solvent barrel 45, a pneumatic three-way valve 14, a pneumatic three-way valve 2 48, a pneumatic three-way valve 3 12, a pneumatic three-way valve 4 9, a pneumatic three-way valve 8 8, a pneumatic three-way valve 9 10, a three-way valve 1 15, a three-way valve 2 11, a chassis 54, a wireless sub-screen 28 of the printing press 1 and a wireless sub-screen 2 of the printing press Screen 41. A weight sensor 57 is installed on the top (or bottom) of the weighing container 7. The first ink supply circulation system consists of the first printing machine circulation barrel 29, pneumatic three-way valve 2, pump 2, viscosity detection device 19, ink supply pipe 25, ink tank 26, and circulation pipe 27, located within the chassis 54. The second ink supply circulation system consists of the second printing machine circulation barrel 37, pneumatic three-way valve 10, pump 4, viscosity detection device 42, ink supply pipe 38, ink tank 40, and circulation pipe 39, located within the chassis 54. Both ink supply circulation systems and their connection structures to the corresponding circulation barrels are identical. Thermostats 58 are installed on the sides (or bottoms) of the first and second printing machine circulation barrels 29 and 37 to maintain the ink at a set temperature. A low-limit liquid level sensor 55 and a high-limit liquid level sensor 56 are installed in the first and second circulation barrels 29 and 37, respectively. The pneumatic three-way valve 8 is connected between the weighing container 7 and the pneumatic three-way valve 9. The 10C port of the pneumatic three-way valve 9 is connected to the 36C port of the pneumatic three-way valve 10. A dual-channel filter funnel 1 is installed in the first circulation barrel 29, and a dual-channel filter funnel 2 is installed in the second circulation barrel 37. The first inlet of the ink supply circulation system (port 48B of the pneumatic three-way valve 2) is connected to the first circulation barrel 29 of the printer through the first channel of the filter funnel 1, while the second inlet of the ink supply circulation system (port 10B of the pneumatic three-way valve 9) is connected to the second circulation barrel 37 of the printer through the first channel of the filter funnel 2.

[0046] The ink supply circulation system 1 is also provided with a pneumatic three-way valve 6 20, a pneumatic three-way valve 7 21, a pneumatic three-way valve 5 23, a three-way valve 3 22 and a pump 3 24. The pneumatic three-way valve 6 20 and the pneumatic three-way valve 7 21 are connected in series in the ink supply pipeline 25 of the printing press, the pneumatic three-way valve 5 23 and the pump 3 24 are connected in series in the circulation pipeline 27 of the printing press, the three-way valve 3 22A and B ports are connected between the pneumatic three-way valve 7 21C port and the pneumatic three-way valve 5 23C port, and the pneumatic three-way valve 6 20C port is connected to the three-way valve 3 22C port; the ink supply circulation system 2 is also provided with a pneumatic three-way valve 11 30, a pneumatic three-way valve 12 31, a pneumatic three-way valve 13 33, a three-way valve 4 32 and a pump 5 34. The pneumatic three-way valve 11 30 and the pneumatic three-way valve 12 31 are connected in series in the second ink supply pipe 38 of the printing press, the pneumatic three-way valve 13 33 and the pump 5 34 are connected in series in the second circulation pipe 39 of the printing press, the three-way valve 4 32A and B ports are connected between the pneumatic three-way valve 12 31C port and the pneumatic three-way valve 13 33C port, and the pneumatic three-way valve 11 30C port is connected to the three-way valve 4 32C port.

[0047] The solvent barrel 45 is connected to the weighing container 7 via the solvent pipeline 18, pneumatic straight-through valve 16, pneumatic three-way valve 14, pump 13, pneumatic three-way valve 3 12, three-way valve 2 11, pneumatic three-way valve 4 9, and pneumatic three-way valve 8 to form a solvent pumping system with a weighing function. The raw ink barrel 46 is connected to the weighing container 7 via the raw ink pipeline 17, three-way valve 15, pneumatic three-way valve 14, pump 13, pneumatic three-way valve 3 12, three-way valve 2 11, pneumatic three-way valve 4 9, and pneumatic three-way valve 8 to form a raw ink pumping system with a weighing function.

[0048] The compressed air source 1, the oil-water separation total air pressure valve 2, the circulating air pressure valve meter 3, the manual pressure regulating valve 5, the one-way check valve 6, the weighing container 7, the pneumatic three-way valve eight 8, and the pneumatic three-way valve four 9 are connected in sequence through pipelines and connected to the printing press first circulation barrel 29 through the second channel of the filter funnel one 43 to form a solvent raw ink addition and viscosity control system one; the compressed air source 1, the oil-water separation total air pressure valve 2, the circulating air pressure valve meter 3, the manual pressure regulating valve 5, the one-way check valve 6, the weighing container 7, the pneumatic three-way valve eight 8, and the pneumatic three-way valve nine 10 are connected in sequence through pipelines and connected to the printing press second circulation barrel through the second channel of the filter funnel two 44 to form a solvent raw ink addition and viscosity control system two. The first outlet of the solvent and original ink addition and viscosity control system (the second outlet of the solvent and original ink addition and viscosity control system) prolongs the compressed air injection time (to the PLC setting) so that the solvent or original ink and the ink in the built-in printing press circulation barrel 1 (printing press circulation barrel 2) are evenly mixed under the action of compressed air. The operator only needs to change the viscosity setting value to automatically add ink according to the viscosity setting value, arbitrarily increase or decrease the viscosity, and thus achieve the purpose of controlling the ink viscosity in the printing press circulation barrel 1 (printing press circulation barrel 2).

[0049] The compressed air source 1, the oil-water separation total air pressure valve 2, the circulating air pressure valve meter 3, the manual pressure regulating valve 5, the one-way check valve 6, the weighing container 7, the pneumatic three-way valve eight 8, the pneumatic three-way valve four 9, the three-way valve two 11, the pneumatic three-way valve three 12, the three-way valve one 15, the raw ink pipeline 17 and the raw ink barrel 46 are connected in sequence to form a raw ink stirring and raw ink pipeline cleaning system to realize the raw ink stirring and raw ink pipeline cleaning functions.

[0050] The compressed air source 1, the oil-water separation total air pressure valve 2, the circulating air pressure valve meter 3, the manual pressure regulating valve 5, the one-way check valve 6, the weighing container 7, the pneumatic three-way valve eight 8, the pneumatic three-way valve four 9, and the three-way valve two 11 are connected to the ink supply circulation system one via the pneumatic three-way valve two 48. The compressed air source 1, the oil-water separation total air pressure valve 2, the circulating air pressure valve meter 3, the manual pressure regulating valve 5, the one-way check valve 6, the weighing container 7, the pneumatic three-way valve eight 8, and the pneumatic three-way valve nine 10 are connected to the ink supply circulation system two via the pneumatic three-way valve ten 36, thereby realizing the automatic cleaning function of the internal circulation detection part of the printing machine one (printing machine two).

[0051] The intelligent control system for printing ink adds pneumatic three-way valve 8 and pneumatic three-way valve 9 10 to the discharge pipe of the weighing container 7 to change the discharge direction of the weighing container. Through two sets of ink supply circulation systems, it can realize the simultaneous automatic long-distance ink supply and collection of different viscosities to two printing machines.

[0052] The main functions and working principles of the printing press ink intelligent control system:

[0053] 1. Working principle of real-time online viscosity detection of ink in ink tank of printing machine and remote automatic ink supply and collection function:

[0054] The ink circulation detection function of the ink tank 26 of the printing press is turned on, the pneumatic three-way valve 2 is opened to the two directions of the built-in printing press circulation barrel 29 and the pump 2 47, and is closed in the direction of the three-way valve 2 11. The pneumatic three-way valve 6 is opened to the two directions of the printing press viscosity detection device 19 and the pneumatic three-way valve 7 21, and is closed in the direction of the three-way valve 3 22. The pneumatic three-way valve 7 21 is opened to the two directions of the pneumatic three-way valve 6 20 and the ink supply pipeline 25 of the printing press, and is closed in the direction of the three-way valve 3 22. The pump 2 47 works to pump the ink in the built-in printing press circulation barrel 29 into the viscosity detection device 19 of the printing press through the filter funnel 1 43 and the pneumatic three-way valve 2 48. The printing press After the viscosity detection device 19 detects the viscosity according to the detection interval frequency time set by the PLC, the ink is sent to the ink tank 26 of the printer for use by the printer through the pneumatic three-way valve six 20, the pneumatic three-way valve seven 21, and the ink supply pipe 25 of the printer. When the ink in the ink tank 26 of the printer is full to the high limit, the pneumatic three-way valve five 23 opens in two directions to the circulation pipe 27 of the printer and the pump three 24, and closes in the direction of the three-way valve three 22. The pump three 24 works to pump the unused ink in the ink tank 26 of the printer from the high limit of the ink in the ink tank of the printer back to the built-in circulation barrel 29 of the printer. This back and forth cycle achieves real-time online viscosity detection of the ink in the ink tank and automatic ink supply to the ink tank.

[0055] When you need to collect the ink in the ink supply pipe, circulation pipe and ink tank after get off work or on vacation, start the ink collection function of the ink tank of the printing machine, open the pneumatic three-way valve five 23 in two directions to the circulation pipe 27 of the printing machine and the pump three 24, and close it in the direction of three-way valve three 22. Pump three 24 works and first pumps the ink at the high limit of the ink tank 26 of the printing machine and the circulation pipe 27 of the printing machine back to the built-in circulation barrel 29 of the printing machine. After the set pump back time is up, the pump three 24 does not stop working, and the pneumatic three-way valve five 23 opens in two directions to the three-way valve three 22 and pump three 24 to the circulation pipe of the printing machine. The pneumatic three-way valve 27 is closed, the pneumatic three-way valve 6 20 is opened in two directions to the three-way valve 22 and the pneumatic three-way valve 7 21, and is closed in the direction to the viscosity detection device 19 of the printing machine. The pneumatic three-way valve 7 21 is opened in two directions to the pneumatic three-way valve 6 20 and the ink supply pipeline 25 of the printing machine, and is closed in the direction to the three-way valve 22. The ink in the ink tank 26 of the printing machine and the ink in the ink supply pipeline 25 of the printing machine are pumped back to the built-in circulation barrel 29 of the built-in printing machine through the pneumatic three-way valve 7 21, the pneumatic three-way valve 6 20, the three-way valve 22 and the pneumatic three-way valve 5 23 within the set time to achieve automatic ink collection.

[0056] By lengthening the ink supply circulation pipe to the ink tank 26 of the printing press and operating the wireless sub-screen 28 of the printing press, the automatic ink supply and collection from the warehouse to the ink tank 26 of the printing press in a sealed state can be achieved. After the automatic ink collection is completed after get off work or on holiday, the ink supply pipe 25, the circulation pipe 27 and the ink tank 26 of the printing press are in an empty state; the circulation of ink in the built-in printing press circulation barrel 29 and the ink tank 26 of the printing press in a sealed state saves a lot of labor, reduces the safety risks such as sparks and static sparks caused by collisions between containers during manual transportation of ink solvents, and prevents fire safety hazards and environmental pollution hazards such as pipeline leakage during long periods of off-duty or holiday periods. The ink circulation in the sealed built-in circulation barrel controls the volatilization of the solvent, thus reducing costs and reducing pollution to the environment.

[0057] The working principles of the real-time online viscosity detection of the ink in the second ink tank 40 of the printing press and the remote automatic ink supply and collection function are the same as those described above.

[0058] 2. Working principle of ink viscosity control, viscosity reduction and viscosity increase function of ink tank of printing machine:

[0059] When the ink circulation detection of the ink tank 26 of the printing machine is started, the ink viscosity control function of the ink tank of the printing machine is turned on. The viscosity detection device 19 of the printing machine detects the viscosity according to the detection interval frequency time set by the PLC. When the viscosity detection value is greater than the viscosity setting value by 0.1 seconds, the pneumatic straight-through valve 16 is opened, the pneumatic three-way valve 14 is opened in two directions of the pneumatic straight-through valve 16 and the pump 13, and is closed in the direction of the three-way valve 15; the pneumatic three-way valve 3 is opened to the three-way valve 2 11 and the pump 13. In two directions, close in the direction of three-way 15, close in the direction of three-way 2 11, open the pneumatic three-way valve 4 9 and move in two directions of three-way 2 11 and pneumatic three-way valve 8 8, close in the direction of built-in printing machine circulation barrel 29, open the pneumatic three-way valve 8 8 and move in two directions of pneumatic three-way valve 4 9 and weighing container 7, close in the direction of pneumatic three-way valve 9 10, open the pneumatic exhaust valve 53, and pump 13 works to pump the solvent through pneumatic straight-through valve 16, pneumatic three-way valve 14, Pneumatic three-way valve 3 12, three-way valve 2 11, pneumatic three-way valve 4 9, and pneumatic three-way valve 8 8 are pumped into the weighing container 7 for weighing. When the solvent weight reaches the weight value set by the PLC, the pneumatic straight-through valve 16 is closed, the pump 13 stops working, and the pneumatic exhaust valve 53 is closed. The pneumatic three-way valve 8 8 is opened in two directions to the weighing container 7 and the pneumatic three-way valve 4 9, and is closed in the direction of the pneumatic three-way valve 9 10. The pneumatic three-way valve 4 9 is opened to the pneumatic three-way valve 8 8 and the built-in printing machine circulation barrel 29. In both directions, the direction toward three-way valve 2 (11) is closed, the designated solenoid valve is opened, and compressed air is adjusted to the appropriate pressure through manual pressure regulating valve 5 and injected into weighing container 7 through one-way check valve 6. Under the action of the compressed air, the solvent in weighing container 7 is injected into the internal printing machine circulation tank 29 through pneumatic three-way valve 8 (8), pneumatic three-way valve 4 (9), and filter funnel 1 (43). Extending the compressed air injection time ensures that the solvent and the ink in the internal printing machine circulation tank 29 are evenly mixed under the action of the compressed air. The operator can achieve the purpose of controlling or reducing viscosity by simply changing the viscosity setting value.

[0060] The working principle of the viscosity control and viscosity reduction function of the ink in the second ink tank 40 of the printing press and the working principle of the viscosity control and viscosity reduction function of the ink in the first ink tank 26 of the printing press are the same, except that when the solvent is added to the weighing container 7 and released, the pneumatic three-way valve eight 8 is opened in two directions of the weighing container 7 and the pneumatic three-way valve nine 10, and is closed in the direction of the pneumatic three-way valve four 9. The pneumatic three-way valve nine 10 is opened in two directions of the pneumatic three-way valve eight 8 and the built-in printing press second circulation barrel 37, and is closed in the direction of the pneumatic three-way valve ten 36. The solvent is injected into the built-in printing press second circulation barrel 37 through the pneumatic three-way valve eight 8, the pneumatic three-way valve nine 10, and the filter funnel two 44.

[0061] The viscosity of the ink in the ink tank 26 of the printing machine increases. When the ink circulation detection of the ink tank of the printing machine is started, the viscosity increase function is turned on. When the viscosity detection value is less than the viscosity setting value by 0.1 seconds, the pneumatic three-way valve 14 opens in two directions to the three-way 15 and the pump 13, and closes in the direction of the pneumatic straight-through valve 16. The pneumatic three-way valve 3 opens in two directions to the three-way 2 11 and the pump 13, and closes in the direction of the three-way 15. The pneumatic three-way valve 24 opens in two directions to the three-way 2 11 and the pump 13, and closes in the direction of the three-way 15. 8 is closed in the direction of three-way 2 11, pneumatic three-way valve 4 9 is opened in two directions of three-way 2 11 and pneumatic three-way valve 8 8, closed in the direction of built-in printing machine circulation barrel 29, pneumatic three-way valve 8 8 is opened in two directions of pneumatic three-way valve 4 9 and weighing container 7, closed in the direction of pneumatic three-way valve 9 10, pneumatic exhaust valve 53 is opened, pump 13 works, and the original ink is pumped through three-way 15, pneumatic three-way valve 14, pneumatic three-way valve 3 12, three-way 2 11. Pneumatic three-way valves 49 and 88 are used to pump ink into the weighing container for weighing. When the weight of the raw ink reaches the weight value set by the PLC, pump 1 stops working and pneumatic exhaust valve 53 closes. Pneumatic three-way valve 88 opens in two directions to the weighing container 7 and pneumatic three-way valve 49, and closes in the direction to pneumatic three-way valve 910. Pneumatic three-way valve 49 opens in two directions to pneumatic three-way valve 88 and the internal printing press circulation barrel 29, and closes in the direction to three-way valve 211. The designated solenoid valve opens, and compressed air is adjusted to an appropriate pressure by the manual pressure regulating valve and injected into the weighing container 7 through the one-way check valve 6. Under the action of compressed air, the raw ink in the weighing container is injected into the internal printing press circulation barrel 29 through the pneumatic three-way valve 88, pneumatic three-way valve 49, and filter funnel 143. The injection time of compressed air is extended so that the raw ink and the ink in the internal printing press circulation barrel 29 are evenly mixed under the action of compressed air.

[0062] The working principle of adding original ink when the viscosity increasing function of the ink in the second ink tank of the printing press is working is the same as the working principle of the viscosity increasing function of the ink in the first ink tank of the printing press, except that when releasing, the pneumatic three-way valve eight 8 is opened in two directions of the weighing container 7 and the pneumatic three-way valve nine 10, and is closed in the direction of the pneumatic three-way valve four 9. The pneumatic three-way valve nine 10 is opened in two directions of the pneumatic three-way valve eight 8 and the built-in printing press second circulation barrel 37, and is closed in the direction of the pneumatic three-way valve ten 36. The original ink is injected into the built-in printing press second circulation barrel 37 through the pneumatic three-way valve eight 8, the pneumatic three-way valve nine 10, and the filter funnel two 44.

[0063] By using the viscosity control, viscosity reduction and viscosity increase functions of the ink in the ink tank of the printing press, the operator can achieve the purpose of arbitrarily reducing, increasing and controlling the viscosity by simply changing the viscosity setting value. When the viscosity does not match the printing quality requirements during the printing process, the viscosity can be quickly adjusted to suit the printing quality requirements, which can effectively solve the color difference and ink waste caused by the increase of ink viscosity due to solvent volatilization.

[0064] 3. Working principle of ink pre-adjustment viscosity function of ink tank of printing machine:

[0065] Before the printing press is started, the ink pre-adjustment viscosity function of the ink tank 26 of the printing press is turned on, the pneumatic three-way valve 2 is opened in two directions to the built-in printing press circulation barrel 29 and pump 2 47, and closed in the direction of three-way 2, the pneumatic three-way valve 6 20 is opened in two directions to the printing press viscosity detection device 19 and the pneumatic three-way valve 7 21, and closed in the direction of three-way 3 22, the pneumatic three-way valve 7 21 is opened in two directions to the pneumatic three-way valve 6 20 and three-way 3 22, and closed in the direction of the ink supply pipe 25 of the printing press, the pneumatic three-way valve 5 23 is opened in two directions to three-way 3 22 and pump 3 24, and closed in the direction of the printing press circulation pipe 27, the pump 2 47 is started, and the ink in the built-in printing press circulation barrel 29 is pumped into the viscosity through the filter funnel 1 43 and the pneumatic three-way valve 2 48. After the detection device 19 detects the viscosity according to the detection interval frequency time set by the PLC, the ink passes through the pneumatic three-way valve six 20, the pneumatic three-way valve seven 21, the three-way valve three 22, the pneumatic three-way valve five 23, and the pump three 24, and then returns to the built-in printing press one circulation barrel 29, forming a state of ink circulation inside the machine. The target viscosity value is set on the touch display screen 51, and the viscosity reduction or viscosity increase function is turned on. According to the working principle of the viscosity reduction or viscosity increase function, the equipment adjusts the ink viscosity of the built-in printing press one circulation barrel 29 to the target viscosity value and automatically stops the pre-adjustment viscosity function. At the same time, it automatically starts the real-time online viscosity detection of the ink in the printing press one ink tank 26 and the long-distance automatic ink supply and ink collection function, and transports the ink in the built-in printing press one circulation barrel 29 to the printing press one ink tank 26 for use.

[0066] The working principle of the ink pre-adjustment viscosity function of the second ink tank 40 of the printing press is consistent with the working principle of the ink pre-adjustment viscosity function of the first ink tank 26 of the printing press, so that the ink viscosity can be pre-adjusted in advance during long-distance automatic ink supply according to the quality requirements of different products, thereby reducing waste and saving time.

[0067] 4. Working principle of automatic ink adding function:

[0068] Turn on the automatic ink adding function of the printing press. When the ink level in the built-in printing press circulation barrel 29 is lower than the low limit liquid level sensor 55, the PLC receives the liquid level sensor signal and, according to the working principle of the viscosity increasing function when adding raw ink, first pumps the raw ink weight value set by the PLC into the weighing container 7, and then, according to the working principle of the viscosity control function or the viscosity reducing function when adding solvent, pumps the amount of solvent automatically calculated by the computer according to the viscosity setting value into the weighing container 7 for weighing, and then, according to the releasing principle of the weighing container when the viscosity control, viscosity reducing and viscosity increasing functions of the ink in the ink tank of the printing press are working, releases the raw ink and solvent in the weighing container 7 into the built-in printing press circulation barrel 29.

[0069] The working principle of the automatic ink adding function of the second printing machine for adding raw ink and solvent is the same as the working principle of the automatic ink adding function of the first printing machine for adding raw ink and solvent, except that the raw ink and solvent in the weighing container 7 are released into the built-in second printing machine circulation barrel 37 according to the weighing container release principle when the viscosity control, viscosity reduction and viscosity increase functions of the ink in the second ink tank of the printing machine are working.

[0070] The automatic ink addition function continuously replenishes new ink in small amounts, ensuring that the original ink and solvent are automatically matched and added at the right time according to the viscosity setting. This achieves automatic addition without alarm prompts or manual intervention, effectively resolving the problem of color difference in traditional printing (because mixing ink in small amounts and multiple times increases the manual workload, resulting in the need to mix large amounts of ink at once. This large amount of ink is repeatedly recycled between the ink tank and the circulation drum for a long time, resulting in a gradual decrease in the masterbatch content between the first half of the ink and the second half of the ink).

[0071] 5. Working principle of usage recording and area ink consumption calculation function:

[0072] During viscosity control, viscosity reduction, viscosity increase, and automatic ink addition, the weighing system records ink and solvent consumption. The central controller, connected to a signal source matched to the press speed, automatically calculates the substrate area and, based on the periodic consumption and area, calculates the ink and solvent consumption for each periodic area of ​​the substrate. This facilitates cost calculation and identifies quality differences between different brands of ink and solvent. By adjusting viscosity to maintain consistent periodic ink consumption, the system effectively addresses color variations that can occur during printing (due to prolonged, high-speed scraping of the plate by the scraper, which causes the V-shaped holes in the plate to become shallower, resulting in a gradual decrease in substrate area consumption and variations in ink consumption between the front and back sections of the substrate).

[0073] 6. Working principle of original ink stirring and original ink pipeline automatic cleaning function:

[0074] Start the original ink stirring function, open the pneumatic three-way valve 8 to the weighing container 7 and the pneumatic three-way valve 4 9, close the pneumatic three-way valve 9 10, open the pneumatic three-way valve 4 9 to the weighing container 8 8 and the three-way valve 2 11, close the pneumatic three-way valve 2 48 to the three-way valve 2 11, open the pneumatic three-way valve 3 12 to the three-way valve 2 11 and the three-way valve 1 15, and close the pneumatic three-way valve 1 13. , pneumatic three-way valve 14 is closed in the direction of three-way valve 15, and at the same time, the pneumatic exhaust valve 53 is closed, the designated solenoid valve is opened, and the compressed air is adjusted to the appropriate pressure by the manual pressure regulating valve, and is injected into the original ink barrel 46 through the one-way check valve 6, weighing container 7, pneumatic three-way valve 8, pneumatic three-way valve 4 9, three-way valve 2 11, pneumatic three-way valve 3 12, and three-way valve 15. The compressed air injection time is extended to achieve the effect of stirring the original ink and prevent the original ink from precipitating after being placed for a long time.

[0075] To start the automatic cleaning function of the raw ink pipeline, first inject compressed air according to the above-mentioned raw ink stirring principle to pump out the ink in the raw ink pipeline 17, and then add the set amount of solvent to the weighing container according to the working principle of adding solvent using the "viscosity control" or "viscosity reduction" function. Then, according to the principle of the above-mentioned raw ink stirring function, compress the air to pump the solvent in the weighing container 7 out of the raw ink pipeline 17, thereby achieving the purpose of automatically cleaning the raw ink pipeline.

[0076] 7. Working principle of the automatic cleaning function of the internal circulation detection part:

[0077] Start the automatic cleaning function of the printing machine, open the pneumatic three-way valve 88 to the weighing container 7 and the pneumatic three-way valve 49, close it to the pneumatic three-way valve 910, open the pneumatic three-way valve 49 to the pneumatic three-way valve 88 and the three-way valve 211, close it to the circulation barrel 29 of the built-in printing machine, close the pneumatic three-way valve 312 to the three-way valve 211, open the pneumatic three-way valve 248 to the three-way valve 211 and the pump 247, and close it to the built-in printing machine. The direction of the machine circulation barrel 29 is closed, the pneumatic three-way valve 6 20 is opened to the viscosity detection device 19 of the printing machine and the pneumatic three-way valve 7 21 in two directions, and the direction of the three-way valve 22 is closed, the pneumatic three-way valve 7 21 is opened to the pneumatic three-way valve 6 20 and the three-way valve 22 in two directions, and the direction of the ink supply pipe 25 of the printing machine is closed, the pneumatic three-way valve 5 23 is opened to the three-way valve 22 and the pump 3 24 in two directions, and the direction of the circulation pipe 27 of the printing machine is closed. The pneumatic exhaust valve 53 is closed, the designated solenoid valve is opened, and the compressed air is adjusted to an appropriate pressure through the manual pressure regulating valve 5, and then passes through the one-way check valve 6, weighing container 7, pneumatic three-way valve eight 8, pneumatic three-way valve four 9, three-way valve two 11, pneumatic three-way valve two 48, pump two 47, printing machine viscosity detection device 19, pneumatic three-way valve six 20, pneumatic three-way valve seven 21, three-way valve three 22, pneumatic three-way valve five 23, and pump three 24. According to the set time, the ink in each pneumatic three-way valve, three-way valve, pump, printing machine viscosity detection device and pipeline is discharged into the built-in printing machine circulation barrel 29. After stopping, according to the working principle of adding solvents by viscosity control or viscosity reduction function, after adding the amount of solvent set by PLC to weighing container 7, the compressed air again discharges the solvent in weighing container 7 into the built-in printing machine circulation barrel 29 according to the above principle, so as to achieve the purpose of automatically cleaning the internal circulation detection part with a small amount of solvent.

[0078] The working principle of the automatic cleaning function of the internal circulation detection part of the second printing machine is the same as that of the automatic cleaning function of the internal circulation detection part of the first printing machine, except that the numbers of the pneumatic three-way valves, three-way valves, pumps, printing machine viscosity detection devices, etc. are different when the compressed air and solvent are discharged from the weighing container.

[0079] 8. Automatically supply and collect ink with different viscosities to multiple printing presses at the same time; automatically supply and collect ink with the same viscosity to multiple printing presses at the same time:

[0080] It is necessary to automatically supply and collect ink with different viscosities to multiple printing presses at the same time. By adding a pneumatic three-way valve with a structure similar to the pneumatic three-way valve 8 and the pneumatic three-way valve 9 10 and connecting it to another ink supply circulation system, the pneumatic three-way valve can be switched to achieve automatic ink supply and collection with different viscosities to more printing presses at a long distance at the same time.

[0081] 9. Working principle of alarm function:

[0082] (1) Ink and solvent shortage alarm: when adding ink or solvent, if the weighing container 7 does not reach the required weight within the set time, it means that the ink or solvent pipeline has not entered the weighing container 7, and an alarm is issued to prompt the shortage of material.

[0083] (2) Loss of weight alarm: an alarm will be issued when the weighing system loses connection with the PLC or there is an abnormal weight failure.

[0084] (3) Viscosity abnormality alarm: when testing viscosity, if there is no test countdown within the set time or the test countdown is abnormal, it means that there may be a test failure or viscosity abnormality, and an alarm prompt will be issued.

[0085] (4) The principle of the high and low limit alarm of the ink level in the circulation barrel of the built-in printing machine is that when the ink level reaches the low limit of the level sensor, the alarm prompts that the circulation barrel of the built-in printing machine is short of ink. When the ink level reaches the high limit of the level sensor, the alarm prompts that the circulation barrel may be full of ink and overflow.

[0086] The principle of the high and low limit alarm of the ink liquid level in the second circulation barrel of the built-in printing machine is the same as the principle of the high and low limit alarm of the ink liquid level in the first circulation barrel of the built-in printing machine.

[0087] Example 4

[0088] like Figure 4 As shown, cancel Figure 3 The second circulation barrel 37 and the pneumatic three-way valve nine 10 of the printing press are provided with a constant temperature device 56 in the first circulation barrel 29 of the printing press. A three-way valve five 55 is added between the pneumatic three-way valve two 48 and the first circulation barrel 29 of the printing press. The C port of the pneumatic three-way valve eight 8 is connected to the C port of the pneumatic three-way valve ten, and the B port of the pneumatic three-way valve ten is connected to the C port of the three-way valve five. According to the requirements of the printing enterprise, a circulation barrel is shared. The other structures are the same as those in Example 3. The same viscosity is achieved to provide multiple printing presses with the function of automatic long-distance ink supply and ink collection.

[0089] Example 5

[0090] like Figure 5 As shown, the three-way valve 2 11 is directly connected to the pump 1 13, the pneumatic three-way valve 3 12 is moved to the pipeline between the pneumatic three-way valve 9 10 and the second circulation barrel 37 of the printing press, and the other port of the pneumatic three-way valve 3 12 is connected to the three-way valve 1 15C port. The other structures are the same as those in Example 3, realizing the function of automatically supplying and collecting ink with different viscosities to multiple printing presses at the same time.

[0091] Example 6

[0092] like Figure 6 As shown, the pneumatic three-way valve eight 8 is moved between the pneumatic three-way valve four 9 and the three-way valve three 11. The other structures are the same as those in the third embodiment, realizing the function of automatically supplying and collecting ink with different viscosities to multiple printing presses at the same time.

[0093] In the above embodiment, the central controller uses Delta PLC DVP32ES2, the touch screen display (main screen) is Delta DOP-115MX, the printing press 1 (printing press 2), the wireless sub-screen (split screen) is DOP-107BV, the weighing module is Delta DVP201LC, the weight sensor is a weight sensor model GJBLS-I produced by Bengbu High Precision Sensing System Co., Ltd., and the liquid level sensor is a float (proximity switch) type sensor.

Claims

1. An intelligent control system for printing ink, comprising a compressed air source, a total air pressure valve, a solenoid valve group, a central controller, a weighing container, a raw ink barrel, a solvent barrel, a printing press circulation barrel with a built-in low limit liquid level sensor, a weighing module connected between the weighing container and the central controller, an ink supply circulation system consisting of a pneumatic three-way valve, a pump, a viscosity detection device for the printing press, an ink supply pipe for the printing press, an ink tank for the printing press, and a printing press circulation pipe connected to the printing press circulation barrel, and also including a pneumatic Straight-through valve 1, pneumatic three-way valve 1, pneumatic three-way valve 3, pneumatic three-way valve 4, three-way valve 1, three-way valve 2 and pump 1; the solvent barrel is connected to the weighing container through the solvent pipeline, pneumatic straight-through valve 1, pneumatic three-way valve 1, pump 1, pneumatic three-way valve 3, three-way valve 2, pneumatic three-way valve 4 to form a solvent pumping system with a weighing function, and the original ink barrel is connected to the weighing container through the original ink pipeline, three-way valve 1, pneumatic three-way valve 1, pump 1, pneumatic three-way valve 3, three-way valve 2, pneumatic three-way valve 4 to form a original ink pumping system with a weighing function system; the compressed air source, the total air pressure valve, the manual pressure regulating valve, the weighing container, the pneumatic three-way valve four and the printing press circulation barrel are connected in sequence through pipelines to form a solvent, raw ink addition and viscosity control system one; by extending the compressed air injection time, the solvent or raw ink and the ink in the printing circulation barrel are mixed evenly under the action of compressed air, and the operator only needs to change the viscosity setting value to achieve automatic ink addition according to the viscosity setting value, arbitrarily increase or decrease the viscosity of the circulating barrel ink and thus achieve the purpose of controlling the viscosity; the compressed air source, the total air pressure valve, the manual pressure regulating valve, the weighing container, the pneumatic three-way valve four, the three-way valve two, and the pneumatic three-way valve two are connected to the ink supply circulation system one to realize the automatic cleaning function of the internal circulation detection part of the printing press one; the compressed air source, the total air pressure valve, the manual pressure regulating valve, the weighing container, the pneumatic three-way valve four, the three-way valve two, the pneumatic three-way valve three, the three-way valve one, the raw ink pipeline and the raw ink barrel are connected in sequence to form a raw ink stirring and raw ink pipeline cleaning system to realize the raw ink stirring and raw ink pipeline cleaning functions; its characteristics are: At least one ink supply circulation system 2 having the same structure as the ink supply circulation system 1 is also provided. The compressed air source, manual pressure regulating valve, and weighing container are connected to the printing press circulation barrel through a pneumatic three-way valve for realizing the pipeline switching function, a pneumatic three-way valve 10 in the ink supply circulation system 2 having the same connection structure as the pneumatic three-way valve 2, and a pneumatic three-way valve 5, so as to realize the function of automatic long-distance ink supply circulation for multiple printing presses with the same viscosity at the same time.

2. The intelligent control system for printing ink according to claim 1 is characterized in that: There is also a second circulation barrel of the printing press with a built-in low limit liquid level sensor corresponding to each ink supply circulation system 2. The connection structure between the ink supply circulation system 2 and the second circulation barrel of the printing press is the same as the connection structure between the ink supply circulation system 1 and the first circulation barrel of the printing press. The compressed air source, manual pressure regulating valve, and weighing container are connected to the corresponding second circulation barrel solvent raw ink addition and viscosity control system of the printing press through a pneumatic three-way valve for realizing the pipeline switching function, and are connected to the ink supply circulation system 2 through a pneumatic three-way valve 10 in the ink supply circulation system 2 with the same connection structure as the pneumatic three-way valve 2, so as to realize the automatic cleaning function of the internal circulation detection part of the printing press 2. By adding a pneumatic three-way valve to the discharge pipe of the weighing container to change the discharge direction of the weighing container, the function of automatic ink supply circulation with different viscosities for multiple printing presses at the same time over a long distance is realized through multiple groups of ink supply circulation systems.

3. The intelligent control system for printing ink according to claim 1 is characterized in that: A double-channel filter funnel is set in the circulation barrel of the printing press. The inlet of the ink supply circulation system is connected to the circulation barrel of the printing press through the first channel of the filter funnel, and the outlet of the solvent, raw ink addition and viscosity control system is connected to the circulation barrel of the printing press through the second channel of the filter funnel.

4. The intelligent control system for printing ink according to claim 1 or 2, characterized in that: A double-channel filter funnel 2 is provided in the second circulation barrel of the printing press. The second inlet of the ink supply circulation system is connected to the second circulation barrel of the printing press through the first channel of the filter funnel 2, and the second outlet of the solvent raw ink addition and viscosity control system is connected to the second circulation barrel of the printing press through the second channel of the filter funnel 2.

5. The printing ink intelligent control system according to claim 1 or 2, characterized in that: The ink supply circulation system 2 is also provided with a pneumatic three-way valve 11, a pneumatic three-way valve 12, a pneumatic three-way valve 13, a three-way valve 4 and a pump 5. The pneumatic three-way valve 11 and the pneumatic three-way valve 12 are connected in series in the ink supply pipeline of the printing press 2, the pneumatic three-way valve 13 and the pump 5 are connected in series in the circulation pipeline of the printing press 2, the A and B ports of the three-way valve 4 are connected between the C port of the pneumatic three-way valve 12 and the C port of the pneumatic three-way valve 13, and the C port of the pneumatic three-way valve 11 is connected to the C port of the three-way valve 4, so as to realize the long-distance ink supply and ink collection function and the viscosity pre-adjustment function.

6. The intelligent control system for printing ink according to claim 5, characterized in that: A high limit liquid level sensor connected to the central controller is arranged in a circulation barrel of the printing machine.

7. The intelligent control system for printing ink according to claim 6, characterized in that: A high liquid limit level sensor is provided in the second circulation barrel of the printing press.

8. The intelligent control system for printing ink according to claim 1, characterized in that: The pneumatic three-way valve for realizing the pipeline switching function includes pneumatic three-way valve 8 and pneumatic three-way valve 9. The pneumatic three-way valve 8 and pneumatic three-way valve 4 are connected in series between the weighing container and the circulation barrel of the printing machine. The C port of pneumatic three-way valve 8 is connected to the circulation barrel of the printing machine 2 through the pneumatic three-way valve 9. The C port of pneumatic three-way valve 9 is connected to the C port of pneumatic three-way valve 10 in the ink supply circulation system 2 with the same structure as the pneumatic three-way valve 2.

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