Gravure device capable of controlling ink viscosity

Abstract

The utility model provides a gravure device capable of controlling ink viscosity, and relates to the technical field of printing. The gravure printing device capable of controlling the ink viscosity comprises a box body, a gravure printing cylinder, a first servo motor, an impression cylinder, a second servo motor, an ink scraping assembly, a stirring rod, a belt wheel, a belt, a material storage part, a supporting frame, a material storage box, a feeding port, a rotary cap, an air hole, a stirring shaft and a third servo motor and further comprises a metering pump, and the metering pump is provided with a feeding port and a discharging port. A feeding port of the metering pump is connected with the storage box, a discharging port of the metering pump is connected with the box body, and viscosity sensors are arranged on the box body and the storage box. When the gravure device is used, the viscosity of printing ink in the box body can be monitored in real time in the printing process; printing ink with higher viscosity or proper solvent is added into the box body, so that the viscosity of the printing ink in the box body is within a normal range value, and the printing quality is improved.

Description

Technical Field

[0001] This utility model relates to the field of printing technology, specifically a gravure printing device that can control ink viscosity. Background Technology

[0002] Gravure printing equipment has an ink reservoir on its surface. Ink from the reservoir is transferred to the paper located between the printing equipment and the rollers through the rolling action of the rollers. Due to the uncertainty of ambient temperature and humidity, the solvent (mainly water) in the ink evaporates at both high and low temperatures, causing the ink to thicken and increase in viscosity. Simultaneously, at high humidity, moisture from the environment enters the ink, causing dilution and reducing viscosity. Whether the ink viscosity increases or decreases, it reduces print quality. Existing gravure printing equipment, after pouring the prepared ink into the ink fountain, simply stirs the ink in the fountain to prevent sedimentation and maintain an appropriate viscosity. However, this method cannot effectively address the increase or loss of water solvent, thus failing to guarantee print quality. Utility Model Content

[0003] The purpose of this invention is to provide a gravure printing device with controllable ink viscosity, aiming to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model adopts the following technical solution: The gravure printing device with controllable ink viscosity includes a housing, inside which a gravure roller is installed. A servo motor for driving the gravure roller to rotate is installed on one side of the housing. An impression roller is installed inside the housing and above the gravure roller. A second servo motor for driving the impression roller to rotate is installed on one side of the housing. An ink scraping assembly for scraping ink from the surface of the gravure roller is installed inside the housing. A stirring rod is installed at the bottom of the housing. A pulley is installed at one end of the stirring rod and one end of the gravure roller. The device includes a belt drive between the pulleys and two sets of storage sections. Each storage section includes a support frame with a storage box mounted on it. The storage box has a feeding port with a rotating cap and a vent hole. A stirring shaft is located inside the storage box, and a servo motor for driving the stirring shaft is located at the bottom of the storage box. The device also includes a metering pump with an inlet and an outlet. The inlet of the metering pump is connected to the storage box, and the outlet is connected to the housing. Viscosity sensors are mounted on both the housing and the storage box.

[0005] Preferably, the device further includes a liquid pump and a solenoid valve. The liquid pump has an inlet port and an outlet port, and the solenoid valve has one inlet port and two outlet ports. The inlet port of the liquid pump is connected to the housing, and the outlet port of the liquid pump is connected to the inlet port of the solenoid valve. The two outlet ports of the solenoid valve are respectively connected to two storage tanks. Liquid level sensors are installed on both the housing and the storage tanks.

[0006] Preferably, the scraper assembly includes a central shaft rotatably connected to the housing, an elastic scraper is provided on the outer surface of the central shaft, both ends of the central shaft pass through the housing and extend to the outside of the housing, end plates are respectively provided at both ends of the central shaft, the two end plates are connected by a crossbar, an extension plate is provided on the housing, a hook plate is rotatably connected to the extension plate, and the crossbar can be hooked on the hook plate.

[0007] Preferably, the horizontal height of the scraper near the printing cylinder is always higher than the horizontal height of the other end of the scraper.

[0008] Preferably, the bottom of the box body is provided with a semi-circular arc shape, and the stirring rod is located at the bottom of the box body.

[0009] The beneficial effects of this utility model are:

[0010] During use, this gravure printing device can monitor the viscosity of the ink inside the printing chamber in real time. By adding ink with higher viscosity or adding appropriate solvents, the viscosity of the ink inside the chamber can be kept within a normal range, thereby improving the printing quality. Attached Figure Description

[0011] Figure 1 This is a structural schematic diagram of a specific embodiment of the present utility model.

[0012] Figure 2 This is a structural schematic diagram of the device from another angle.

[0013] Figure 3 This is a schematic diagram of the internal structure of the box.

[0014] In the diagram: 1. Printing substrate; 2. Box body; 3. Gravure printing cylinder; 4. Servo motor one; 5. Imprinting cylinder; 6. Servo motor two; 7. Stirring rod; 8. Pulley; 9. Belt; 10. Support frame; 11. Storage box; 12. Rotary cap; 13. Stirring shaft; 14. Servo motor three; 15. Metering pump; 16. Viscosity sensor; 17. Liquid pump; 18. Solenoid valve; 19. Liquid level sensor; 20. Central shaft; 21. Scraper; 22. End plate; 23. Crossbar; 24. Extension plate; 25. Hook plate. Detailed Implementation

[0015] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0016] like Figure 1-3 As shown, a gravure printing device with controllable ink viscosity includes a housing 2, inside which a gravure roller 3 is installed. A servo motor 4 for driving the gravure roller 3 is installed on one side of the housing 2. An impression roller 5 is installed inside the housing 2 and above the gravure roller 3. A servo motor 6 for driving the impression roller 5 is installed on one side of the housing 2. An ink scraping assembly for scraping ink from the surface of the gravure roller 3 is installed inside the housing 2. A stirring rod 7 is installed at the bottom of the housing 2. A pulley 8 is installed at one end of the stirring rod 7 and one end of the gravure roller 3. The two pulleys 8 are connected by a belt 9. The device also includes two… The material storage unit includes a support frame 10, a storage tank 11 mounted on the support frame 10, a feeding port on the storage tank 11, a cap 12 with a vent hole at the feeding port, a stirring shaft 13 inside the storage tank 11, a servo motor 14 for driving the stirring shaft 13 to rotate at the bottom of the storage tank 11, and a metering pump 15 with an inlet port and an outlet port. The inlet port of the metering pump 15 is connected to the storage tank 11, and the outlet port of the metering pump 15 is connected to the housing 2. Viscosity sensors 16 are mounted on both the housing 2 and the storage tank 11.

[0017] When printing on substrate 1, an appropriate amount of ink with suitable viscosity is first added into the box 2. Then, the gravure cylinder 3 is rotated by servo motor 4, and the impression cylinder 5 is rotated by servo motor 6. The ink scraper assembly scrapes off the excess ink on the surface of the gravure cylinder 3. Then, the ink in the groove on the surface of the gravure cylinder 3 is transferred to the substrate 1, thereby realizing the printing of substrate 1.

[0018] During the rotation of the gravure printing cylinder 3, the stirring rod 7 can be driven to rotate through the transmission of the pulley 8 and the belt 9. The stirring rod 7 stirs the ink in the box 2, thereby preventing the ink in the box 2 from settling and keeping the viscosity of the ink in the box 2 at a relatively uniform level. At the same time, the transmission of the belt 9 and the pulley 8 can be omitted, and the stirring rod 7 can be driven to rotate directly through an additional servo motor to achieve the stirring of the ink in the box 2.

[0019] The two storage tanks 11 store different substances. One storage tank 11 is used to store solvent, which is water in this case. The other storage tank 11 is used to store diluted ink with a higher viscosity. When the viscosity of the ink in the tank 2 is within a normal range, it can be used normally. However, when the viscosity of the ink in the tank 2 is high, exceeding the upper limit of the normal range, the viscosity sensor 16 detects the viscosity and controls the metering pump 15 connected to the storage tank 11 containing the solvent to start through the corresponding viscosity control module. The metering pump 15 delivers an appropriate and measured amount of water into the tank 2. After the stirring rod 7 stirs the ink in the tank 2 evenly, the viscosity sensor 16 continues to detect the viscosity of the ink in the tank 2. If the viscosity of the ink in the tank 2 is within the normal range, the metering pump 15 stops delivering water into the tank 2. If the viscosity is still high, the metering pump 15 continues to deliver an appropriate and measured amount of water into the tank 2 until the viscosity of the ink in the tank 2 is within the normal range, generally taking the middle value of the normal range.

[0020] Similarly, when the viscosity of the ink in the chamber 2 is low, another metering pump 15 is used to deliver ink with a higher viscosity to the chamber 2. Then, the stirring rod 7 is used to stir the ink in the chamber 2 evenly. The viscosity of the ink in the chamber 2 is then tested until the viscosity of the ink in the chamber 2 is within the normal range. Generally, the viscosity of the ink in the chamber 2 is taken as the middle value of the normal range.

[0021] Servo motor 14 can drive the stirring shaft 13 inside the storage tank 11 to rotate, thereby preventing the solvent or ink in the two storage tanks 11 from settling and separating. In addition, the viscosity sensor 16 on the two storage tanks 11 can also detect the viscosity of the liquid in the two storage tanks 11 at the same time.

[0022] When adding solvent or ink into the storage tank 11, the cap 12 needs to be opened, and then the solvent or ink is added into the storage tank 11. After adding, the cap 12 is reinstalled onto the storage tank 11. The through hole on the cap 12 can be used to balance the pressure inside and outside the storage tank 11. A corresponding filter screen can be installed at the position of the through hole to reduce dust from entering the storage tank 11.

[0023] Furthermore, it also includes a liquid pump 17 and a solenoid valve 18. The liquid pump 17 has an inlet port and an outlet port, and the solenoid valve 18 has one inlet port and two outlet ports. The inlet port of the liquid pump 17 is connected to the housing 2, and the outlet port of the liquid pump 17 is connected to the inlet port of the solenoid valve 18. The two outlet ports of the solenoid valve 18 are respectively connected to two storage tanks 11. Liquid level sensors 19 are installed on both the housing 2 and the storage tanks 11. When the total amount of ink in the housing 2 is large and the viscosity is not within the normal range, the liquid level sensor 19 first detects the ink level. If the ink level is high, it will trigger a liquid level sensor. The liquid level control module drives the liquid pump 17 to start, which draws away the ink in the tank 2. If the viscosity of the ink in the tank 2 is lower than the normal range, the ink in the tank 2 is directed to the storage tank 11 containing solvent under the action of the solenoid valve 18. If the viscosity of the ink in the tank 2 is higher than the normal range, the ink in the tank 2 is directed to another storage tank 11 under the action of the solenoid valve 18. When the ink level in the tank 2 drops to a suitable height, one of the two metering pumps 15 is selected to transport the solvent or ink in the storage tank 11 to the tank 2 to adjust the viscosity of the ink in the tank 2.

[0024] If the liquid mixture of solvent and ink in storage tank 11 and the liquid level of ink in another storage tank 11 are high, the liquid level sensor 19 on the storage tank 11 can detect this in time. It is only necessary to extract a portion of the liquid from each storage tank 11. The extracted portion does not enter the tank body 2 but is stored on the outside. If the liquid level is low, appropriate materials are added to each of the two storage tanks 11.

[0025] If the viscosity sensor 16 detects that the viscosity in the storage tank 11 is not within the normal range and the viscosity of the ink in the tank 2 cannot be effectively adjusted, all the liquid in both storage tanks 11 can be removed and replaced with new material. The removed liquid can be used as raw material for mixing ink.

[0026] All the pumps, sensors, solenoid valves 18, servo motors, control modules, etc. mentioned above are controlled by the PLC controller and its associated equipment.

[0027] Furthermore, the ink scraping assembly includes a central shaft 20 rotatably connected to the housing 2. The outer surface of the central shaft 20 is provided with an elastic scraper 21. Both ends of the central shaft 20 pass through the housing 2 and extend to the outside of the housing 2. End plates 22 are respectively provided at both ends of the central shaft 20. The two end plates 22 are connected by a crossbar 23. An extension plate 24 is provided on the housing 2. A hook plate 25 is rotatably connected to the extension plate 24. The crossbar 23 can be hooked on the hook plate 25. The scraper 21 is made of rubber, silicone, or plastic. When the scraper 21 is pressed against the surface of the gravure cylinder 3, the scraper 21 will bend, so that the scraper 21 can better fit the surface of the gravure cylinder 3 and scrape off the ink on the surface of the gravure cylinder 3, but not in the grooves. Most of the scraped ink will flow directly back into the housing 2.

[0028] When the gravure printing cylinder 3 is not in use, the weight of the crossbar 23 is greater than the combined weight of the central shaft 20 and the scraper 21. When the crossbar 23 moves downward, the central shaft 20 and the scraper 21 move upward. At the same time, the scraper 21 does not contact the surface of the gravure printing cylinder 3. When the gravure printing cylinder 3 is in use, by controlling the crossbar 23 to move upward, the scraper 21 is made to stick to the surface of the gravure printing cylinder 3 and bend, so that the lower end of the hook plate 25 can hook the crossbar 23. Then, the crossbar 23 and the hook plate 25 are released. Under the action of the scraper 21's own elasticity, the scraper 21 will restore a certain deformation, avoiding excessive friction between the scraper 21 and the gravure printing cylinder 3. At the same time, it also maintains an appropriate friction between the scraper 21 and the gravure printing cylinder 3 so that the scraper 21 can effectively scrape off excess ink from the surface of the gravure printing cylinder 3.

[0029] Furthermore, the horizontal height of the scraper 21 near the printing cylinder 3 is always higher than the horizontal height of the other end of the scraper 21, so as to prevent the scraper 21 from moving against the printing cylinder 3. When the scraper 21 moves along the printing cylinder 3, the printing cylinder 3 will not come into contact with the scraper 21, which can effectively prevent the scraper 21 from being damaged.

[0030] Furthermore, the bottom of the box 2 is provided with a semi-circular arc shape, and the stirring rod 7 is located at the bottom of the box 2 to facilitate effective stirring of the ink inside the box 2.

[0031] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A gravure printing apparatus for controlling ink viscosity, characterized in that, The device includes a housing, inside which is installed a gravure printing cylinder. A servo motor for driving the gravure printing cylinder is located on one side of the housing. An impression cylinder is located inside the housing and above the gravure printing cylinder. A servo motor for driving the impression cylinder is located on one side of the housing. An ink scraping assembly for scraping ink from the surface of the gravure printing cylinder is located inside the housing. A stirring rod is located at the bottom of the housing. Both one end of the stirring rod and one end of the gravure printing cylinder are equipped with pulleys, which are connected by a belt drive. The device also includes two sets of storage containers. The material storage section includes a support frame with a storage tank on the support frame. The storage tank has a feeding port with a rotating cap and a vent hole. A stirring shaft is installed inside the storage tank, and a servo motor for driving the stirring shaft is installed at the bottom of the storage tank. The section also includes a metering pump with an inlet and an outlet. The inlet of the metering pump is connected to the storage tank, and the outlet is connected to the tank body. Viscosity sensors are installed on both the tank body and the storage tank.

2. The controllable viscosity of ink gravure printing device according to claim 1, wherein It also includes a liquid pump and a solenoid valve. The liquid pump has an inlet port and an outlet port, and the solenoid valve has one inlet port and two outlet ports. The inlet port of the liquid pump is connected to the housing, and the outlet port of the liquid pump is connected to the inlet port of the solenoid valve. The two outlet ports of the solenoid valve are respectively connected to two storage tanks. Liquid level sensors are installed on the housing and the storage tanks.

3. The controllable viscosity of ink gravure printing device according to claim 1, wherein, The ink scraper assembly includes a central shaft rotatably connected to the housing. The outer surface of the central shaft is provided with an elastic scraper. Both ends of the central shaft pass through the housing and extend to the outside of the housing. End plates are respectively provided at both ends of the central shaft. The two end plates are connected by a crossbar. An extension plate is provided on the housing. A hook plate is rotatably connected to the extension plate. The crossbar can be hooked on the hook plate.

4. The controllable viscosity of ink gravure printing apparatus according to claim 3, wherein The horizontal height of the scraper near the printing cylinder is always higher than the horizontal height of the other end of the scraper.

5. The controllable viscosity of ink gravure printing apparatus according to claim 1, wherein The bottom of the box is provided with a semi-circular arc shape, and the stirring rod is located at the bottom of the box.

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