A digital inkjet system based on a traditional offset printing machine

Abstract

This invention relates to the field of offset printing technology, specifically to a digital inkjet system based on a traditional offset printing machine. The system includes an ink delivery system, an inkjet control system, and existing offset printing machine components. The ink delivery system comprises an ink tank, a precision metering pump, and a storage tank. The storage tank is filled with pre-made water-in-oil emulsion ink. The inkjet control system includes a solenoid valve and a second extraction tube. The existing offset printing machine components include an offset printing machine body, a receiving block mounted on the machine body, and a temperature control mechanism. The temperature control mechanism includes a first temperature control element and a second temperature control element. The inkjet head is fixedly mounted on the bottom of the receiving block. By replacing the existing ink tank, water tank, ink path, and water path with the ink delivery system and inkjet control system, the printing accuracy and quality are improved, and production efficiency and flexibility are enhanced. The precisely movable receiving block, combined with the pre-made water-in-oil emulsion ink and the temperature control mechanism, ensures the accuracy and quality of the offset printing.

Description

Technical Field

[0001] This invention belongs to the field of offset printing technology, specifically relating to a digital inkjet system based on a traditional offset printing machine. Background Technology

[0002] Existing printing technologies include traditional offset printing using printing plates and digital printing without printing plates. Among traditional printing technologies, offset printing is the dominant one. Its main equipment structure consists of a printing plate roller, a blanket roller, and an impression roller. The advantages of this technology are low cost and clear images, making it one of the most widely used printing technologies. Its disadvantage is that because it requires printing plates, it cannot achieve variable data printing and cannot adapt to the development trend of the printing market that requires multiple varieties and small batches.

[0003] Digital printing technology encompasses two main approaches: inkjet and electrostatic printing. According to publicly available information from various digital printing equipment manufacturers, both methods involve direct imaging onto the printing substrate. Digital printing eliminates the need for printing plates; the graphic information to be printed is directly imaged onto the substrate, enabling variable data printing. However, current print quality cannot yet match that of traditional offset printing, and its operating costs are significantly higher.

[0004] To enable traditional offset printing presses to meet the requirements of variable data printing, to prevent the vast number of offset printing presses from being completely eliminated in the digital wave, and to revitalize offset printing presses in the digital age, we propose a digital inkjet system based on traditional offset printing presses. This system combines existing offset printing technology with digital printing technology, which can not only improve printing accuracy and quality, increase production efficiency and flexibility, solve the problem of ink diffusion on absorbent materials (such as paper), and enable inkjet printing to achieve offset printing quality, but also allow traditional offset printing presses to be modified to adapt to the printing needs of the new era. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a digital inkjet system based on a traditional offset printing machine to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a digital inkjet system based on a traditional offset printing machine, comprising an ink transport system, an inkjet control system, and existing offset printing machine components. The ink transport system includes an ink tank, a precision metering pump, and a storage tank. The storage tank is filled with pre-made water-in-oil emulsion ink. The inkjet control system includes a solenoid valve and a second extraction tube. The existing offset printing machine components include an offset printing machine body, a receiving block mounted on the offset printing machine body, and a temperature control mechanism. The temperature control mechanism includes a first temperature control element and a second temperature control element. An inkjet head is fixedly installed at the bottom of the block. The solenoid valve is installed inside the receiving block. A vertical pipe is fixedly connected between the solenoid valve and the inkjet head. The ink tank is fixedly connected to the top of the receiving block. The precision metering pump is fixedly connected to the top of the ink tank. An ink pump is fixedly connected to the top of the storage tank. An output pipe is fixedly connected between the ink pump and the storage tank. A bellows pipe is fixedly connected between the ink pump and the ink tank. An extraction pipe one is fixedly connected between the precision metering pump and the ink tank. An extraction pipe two is fixedly connected between the precision metering pump and the solenoid valve.

[0007] Preferably, if the extraction tube, ink tank, precision metering pump, and corrugated pipe are considered as a single integrated mechanism, then the top of the receiving block is provided with multiple equidistant and arrayed integrated mechanisms. Similarly, there are multiple ink pumps and output tubes, which are equidistant and arrayed on the top of the storage box. There are also multiple inkjet heads, vertical tubes, and solenoid valves, which are equidistant and arrayed on the bottom of the receiving block. The vertical tubes and solenoid valves are equidistantly arranged inside the receiving block.

[0008] Preferably, the temperature control component includes a water-cooled box. A first rubber blanket roller, a second rubber blanket roller, and an impression roller are rotatably connected between the two ends of the inner wall of the offset printing machine body. An installation groove is provided inside the offset printing machine body. Hollow shafts are fixedly connected to both ends of the first rubber blanket roller. The hollow shafts are rotatably connected to the inner wall of the offset printing machine body, and their ends are located inside the installation groove. One end of the hollow shaft is fixedly connected to and communicates with a rotary joint. The rotary joint is fixedly connected to the inside of the installation groove. One end of each of the two rotary joints is fixedly connected to and communicates with a circulation pipe. A portion of the circulation pipe is fixedly connected to the inside of the installation groove, and the other portion of the installation groove is fixedly connected to the outer wall of the offset printing machine body. The ends of the two circulation pipes are respectively connected to the two ends of the same water-cooled box, which is installed at the bottom of the offset printing machine body.

[0009] Preferably, the water-cooled box is internally equipped with a compressor, a condenser, an evaporator, a circulating water pump, multiple copper pipes and water pipes. The compressor and evaporator, the evaporator and condenser, and the compressor and condenser are all connected by copper pipes. The circulating water pump is connected to the inlet and outlet of the evaporator and condenser through water pipes to form a closed cooling water circulation system.

[0010] Preferably, a cylinder is fixedly connected between the inner walls of the two sides of the first rubber blanket roller. Both ends of the cylinder are chamfered. The length of the cylinder is slightly smaller than that of the first rubber blanket roller, and the diameter of the bottom circle is also smaller than that of the first rubber blanket roller. Multiple equally spaced meandering plates that are rotatably distributed about the axis of the cylinder are fixedly connected between the outer wall of the cylinder and the inner wall of the first rubber blanket roller. A meandering channel is formed between every two adjacent meandering plates.

[0011] Preferably, the second temperature control component includes an electric heating tube assembly. A horizontal shaft is fixedly connected to both outer walls of the second rubber blanket roller. The horizontal shaft is rotatably connected to the inner wall of the offset printing machine, and its end is located inside the mounting groove. The electric heating tube assembly is disposed inside the second rubber blanket roller. The electric heating tube assembly consists of multiple independent electric heating tubes equidistantly connected around the axis of the second rubber blanket roller. Four equidistantly arranged ceramic support frames are fixedly connected between the outer wall of each electric heating tube assembly and the inner wall of the second rubber blanket roller. A heat insulation layer is fixedly connected between one end of the electric heating tube assembly and one side of the inner wall of the second rubber blanket roller. A wire is disposed inside the heat insulation layer. One end of the wire passes through the outer wall of the second rubber blanket roller and is connected to a power control component. An intelligent temperature control component is disposed on the outer wall of the second rubber blanket roller. Both the power control component and the intelligent temperature control component are fixedly connected to a non-axial position on the outer wall of the second rubber blanket roller. Their installation position does not conflict with the horizontal shaft. The intelligent temperature control component has a built-in probe that passes through the second rubber blanket roller and enters the interior of the second rubber blanket roller.

[0012] Preferably, a second motor is fixedly connected inside the mounting groove. A main gear is fixedly connected to one end of the output shaft of the second motor. Drive gears are fixedly connected to the outer walls of both horizontal shafts. The main gears mesh with drive gears. Drive gears are fixedly connected to the outer walls of both hollow shafts. Drive gears mesh with drive gears and the impression cylinder. A first motor is fixedly connected to the bottom of the inner wall of the mounting groove. A precision lead screw is fixedly connected to one end of the output shaft of the first motor. A portion of the precision lead screw and the first motor are both located inside the mounting groove. The top end of the precision lead screw passes through the top of the offset printing machine body and is rotatably connected to the interior of the offset printing machine body. Two ventilation slots are opened on the side of the mounting groove, and a mesh is provided at the end of each of the two ventilation slots.

[0013] Preferably, side blocks are provided on both outer walls of the offset printing machine body. A top block and a rectangular slot are fixedly connected to the outer wall of the two side blocks that are close to each other. The rectangular slot is located below the top block. The top end of the precision lead screw is rotatably connected to the inside of the top block. A base block is threadedly connected to the outer wall of the precision lead screw. The receiving block is fixedly connected between the two base blocks. Two sliding rods that are far apart from each other and symmetrically distributed are fixedly connected between the bottom end of the top block and the top of the offset printing machine body. The inside of the base block and the outer walls of the two sliding rods are in a sliding connection relationship.

[0014] Preferably, the rectangular slot is concave in shape. A rack is fixedly connected to one side of the inner wall of the rectangular slot. A spur gear meshes with the outer wall of the rack. Two spaced-apart stabilizing plates are fixedly connected to the outer wall of the base block near the side block. The spur gear is rotatably connected between the two stabilizing plates. The base block has a square through slot and a circular through slot that are internally interconnected. A crossbar is rotatably connected between the inner walls of the two sides of the square through slot. A connecting belt is connected between the outer wall of the crossbar and the outer wall of the spur gear shaft. The connecting belt is located between the spur portion of the spur gear and one of the stabilizing plates. A helical gear is fixedly connected to the outer wall of the crossbar. A meshing assembly meshes with the outer wall of the helical gear. The meshing assembly is rotatably connected to the bottom of the inner wall of the square through slot. The meshing assembly includes a short shaft, a helical gear two and a horizontal gear fixedly connected to the outer wall of the short shaft. The helical gear two meshes with the helical gear one. A cylindrical box is rotatably connected to the inner wall of the circular through slot.

[0015] Preferably, the outer wall of the cylindrical box has an annular groove, and an annular gear is fixedly connected to the inner wall of the annular groove. The horizontal gear and the annular gear are meshed. The interior of the cylindrical box has an inner groove, and a lubricating element is fixedly connected to the bottom of the inner wall of the inner groove. A limiting ring is fixedly connected to the top of the lubricating element. Multiple connecting blocks with chamfered tops are fixedly connected between the limiting ring and the inner wall of the cylindrical box. The lubricating element includes polyurethane foam and a brush layer fixed inside the polyurethane foam. The brush layer is movably connected to the outer wall of the precision lead screw. An oil injection channel is provided inside the base block. The interior of the oil injection channel is interconnected with the outside and the interior of the square through groove. One end of the oil injection channel is located above the connecting block. Multiple ball bearings are provided at equal intervals and circumferentially distributed around the axis of the cylindrical box at the bottom. Each ball bearing is in a rolling connection with the bottom of the inner wall of the circular through groove.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] By replacing the existing ink tank, water tank, ink path, and water path in the structure with a specially designed ink transfer system and inkjet control system, the printing accuracy and quality are improved, and the production efficiency and flexibility are enhanced. Through the design of a precisely movable receiving block, the use of pre-prepared water-in-oil emulsion ink in conjunction with the temperature control mechanism ensures the accuracy and quality of offset printing. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a schematic diagram showing the connection relationship between the precision lead screw and other components of the present invention.

[0020] Figure 3 For the present invention Figure 2 A schematic diagram of the overall cross-sectional structure.

[0021] Figure 4 For the present invention Figure 3 Enlarged schematic diagram of the overall cross-section at point A.

[0022] Figure 5 This is a schematic cross-sectional view of the base block of the present invention.

[0023] Figure 6 This is a schematic diagram showing the connection relationship between the cylindrical box and other components of the present invention.

[0024] Figure 7 This is a schematic diagram of the overall structure of the cylindrical box of the present invention.

[0025] Figure 8 This is a schematic diagram of the overall structure of the cylindrical box of the present invention from another perspective.

[0026] Figure 9 This is a schematic diagram showing the connection relationship between the receiving block and other mechanisms of the present invention.

[0027] Figure 10 This is a schematic diagram of the structure involved in the ink transfer system of the present invention.

[0028] Figure 11 For the present invention Figure 10 Enlarged schematic diagram of the overall cross-section at point B.

[0029] Figure 12 This is a schematic diagram of the structure of the ink transfer system of the present invention from another perspective.

[0030] Figure 13 For the present invention Figure 12 Enlarged schematic diagram of the overall cross-section at point C.

[0031] Figure 14 This is a schematic diagram showing the connection relationship of the three rollers in this invention.

[0032] Figure 15 This is a schematic diagram of the internal structure of the rubber blanket roller of the present invention.

[0033] Figure 16 This is a schematic diagram of the internal structure of the second rubber blanket roller of the present invention.

[0034] In the diagram: 1. Offset printing machine body; 2. Mounting slot; 3. Motor 1; 4. Precision lead screw; 5. Base block; 6. Side block; 7. Top block; 8. Slide rod; 9. Rectangular slot; 10. Rack; 11. Gear with shaft; 12. Stabilizing plate; 13. Connecting belt; 14. Crossbar; 15. Helical gear 1; 16. Meshing assembly; 17. Cylindrical box; 18. Ring gear; 19. Square through slot; 20. Circular through slot; 21. Inner groove; 22. Limiting ring; 23. Connecting block; 24. Lubricating component; 25. Oil injection channel; 26. Ball bearing; 27. Receiving block; 28. Inkjet head; 29. ​​Solenoid valve; 30. 31. Extraction tube 2; 32. Ink tank; 33. Precision metering pump; 34. Corrugated pipe; 35. Ink pump; 36. Output pipe; 37. Storage box; 38. Rubber blanket roller 1; 39. Rubber blanket roller 2; 40. Imprinting roller; 41. Hollow shaft; 42. Drive gear 1; 43. Rotary joint; 44. Circulation pipe; 45. Water cooling box; 46. Cylinder; 47. Winding plate; 48. Horizontal shaft; 49. Drive gear 2; 50. Heating tube assembly; 51. Ceramic support frame; 52. Insulation layer; 53. Power control component; 54. Intelligent temperature control component; 55. Main gear; 56. Motor 2. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Example 1, please refer to Figures 1 to 16This invention provides a technical solution: a digital inkjet system based on a traditional offset printing machine, comprising an ink transport system, an inkjet control system, and the original offset printing machine components. The ink transport system includes an ink tank 31, a precision metering pump 32, and a storage tank 36. The storage tank 36 is filled with pre-made water-in-oil emulsion ink. The inkjet control system includes a solenoid valve 29 and a second extraction tube 30. The original offset printing machine components include an offset printing machine body 1, a receiving block 27 mounted on the offset printing machine body 1, and a temperature control mechanism. The temperature control mechanism includes a first temperature control element and a second temperature control element. An inkjet head 28 is fixedly mounted on the bottom end of the receiving block 27. Solenoid valve 29 is installed inside receiving block 27. A vertical pipe is fixedly connected between solenoid valve 29 and inkjet head 28. Ink tank 31 is fixedly connected to the top of receiving block 27. Precision metering pump 32 is fixedly connected to the top of ink tank 31. Ink pump 34 is fixedly connected to the top of storage tank 36. Ink pump 34 is fixedly connected to storage tank 36 and connected by output pipe 35. Ink pump 34 is fixedly connected to ink tank 31 and connected by corrugated pipe 33. Precision metering pump 32 is fixedly connected to ink tank 31 by extraction pipe one. Extraction pipe two 30 is fixedly connected between precision metering pump 32 and solenoid valve 29. By replacing the ink tank, water tank, ink path, and water path in the existing structure with the set ink transfer system and inkjet control system, the printing accuracy and quality are improved, and the production efficiency and flexibility are enhanced. Through the set precisely displaceable receiving block 27, the pre-prepared pre-made water-in-oil emulsion ink is used in conjunction with the temperature control mechanism to ensure the accuracy and quality of offset printing.

[0037] Example 2, please refer to Figures 1 to 16 Based on Embodiment 1, the extraction tube 30, ink tank 31, precision metering pump 32, and corrugated pipe 33 are considered as a single integrated mechanism. The top of the receiving block 27 is provided with multiple equidistant and arrayed integrated mechanisms. There are also multiple ink pumps 34 and output tubes 35. Multiple ink pumps 34 and output tubes 35 are equidistant and arrayed on the top of the storage box 36. There are also multiple inkjet heads 28, vertical tubes, and solenoid valves 29. Multiple inkjet heads 28 are equidistant and arrayed on the bottom of the receiving block 27. Multiple vertical tubes and solenoid valves 29 are equidistant inside the receiving block 27.

[0038] It should be noted that the temperature control mechanism can precisely control the temperature of the subsequent blanket roller 37 and blanket roller 38, keeping the temperature consistently between 15 and 85°C, with fluctuations not exceeding ±2°C. The storage tank 36 is filled with pre-prepared water-in-oil emulsion ink. After the solvent evaporates, the ink properties become closer to ink than water-based ink, which helps ensure offset printing quality. The inkjet head 28 consists of a cluster of small nozzles, arranged in a horizontal array and covering the entire surface of the blanket roller 37. When the ink pump 34 receives a start signal, the ink inside the storage tank 36 is delivered to the ink tank 31 for temporary storage via the output pipe 35 and the action of the ink pump 34. When the precision metering pump 32 receives a start signal, the ink inside the ink tank 31 is pumped out... The ink flows from the extraction tube 30 to the precision metering pump 32, which controls the amount of ink flowing out to ensure accurate ink supply. This ink then passes through the extraction tube 30 and finally reaches the solenoid valve 29. The solenoid valve 29 can be opened and closed to achieve on-demand ink supply. Finally, the ink passes through the vertical tube to the inkjet head 28 and is ejected through several small nozzles. Combined with the solenoid valve 29, on-demand inkjet printing is achieved, improving printing accuracy and quality, increasing production efficiency and flexibility. Replacing the printing plate cylinder in the existing structure with a blanket cylinder is equivalent to using two blanket cylinders for ink transfer, which accelerates the evaporation of solvents in the ink and avoids the expansion of ink droplets. Through the above structure and system, the offset printing machine can maintain its vitality and adapt to the requirements of variable data printing.

[0039] Example 3, please refer to Figures 1 to 16Based on Embodiment 1, the temperature control component includes a water-cooled box 44. A first rubber blanket roller 37, a second rubber blanket roller 38, and an impression roller 39 are rotatably connected between the two ends of the inner wall of the offset printing machine body 1. An installation groove 2 is provided inside the offset printing machine body 1. Hollow shafts 40 are fixedly connected to both ends of the first rubber blanket roller 37. The hollow shafts 40 are rotatably connected to the inner wall of the offset printing machine body 1, and their ends are located inside the installation groove 2. One end of the hollow shaft 40 is fixedly connected to and communicates with a rotary joint 42. The rotary joint 42 is fixedly connected inside the installation groove 2. One end of each of the two rotary joints 42 is fixedly connected to and communicates with a circulation pipe 43. A portion of the circulation pipe 43 is fixedly connected inside the installation groove 2, and the other portion is... The mounting slot 2 is fixedly connected to the outer wall of the offset printing machine body 1. The ends of the two circulation pipes 43 are respectively connected to the two ends of the same water-cooled box 44. The water-cooled box 44 is installed at the bottom of the offset printing machine body 1. The interior of the water-cooled box 44 is equipped with a compressor, condenser, evaporator, circulating water pump, multiple copper pipes and water pipes. Copper pipes are used to connect the compressor and evaporator, the evaporator and condenser, and the compressor and condenser. The circulating water pump is connected to the inlet and outlet of the evaporator and condenser through water pipes to form a closed cooling water circulation system. A cylinder 45 is fixedly connected between the inner walls of the two sides of the blanket roller 37. Both ends of the cylinder 45 are chamfered. The length of the cylinder 45 is slightly smaller than that of the blanket roller 37. 7. The diameter of the bottom circle is also smaller than that of the first rubber blanket roller 37. Multiple equally spaced meandering plates 46 are fixedly connected between the outer wall of the cylinder 45 and the inner wall of the first rubber blanket roller 37, rotating about the axis of the cylinder 45. A meandering channel is formed between every two adjacent meandering plates 46. The second temperature control component includes an electric heating tube assembly 49. Horizontal shafts 47 are fixedly connected to both outer walls of the second rubber blanket roller 38. The horizontal shafts 47 are rotatably connected to the inner wall of the offset printing machine body 1, and their ends are located inside the mounting groove 2. The electric heating tube assembly 49 is located inside the second rubber blanket roller 38. The electric heating tube assembly 49 consists of multiple independent electric heating tubes equidistantly connected around the axis of the second rubber blanket roller 38. Each electric heating tube assembly... Four equidistant ceramic support frames 50 are fixedly connected between the outer wall of component 49 and the inner wall of the second rubber cloth roller 38. A heat insulation layer 51 is fixedly connected between one end of the heating tube assembly 49 and one side of the inner wall of the second rubber cloth roller 38. A wire is installed inside the heat insulation layer 51. One end of the wire passes through the outer wall of the second rubber cloth roller 38 and is connected to a power control component 52. An intelligent temperature control component 53 is installed on the outer wall of the second rubber cloth roller 38. Both the power control component 52 and the intelligent temperature control component 53 are fixedly connected to the non-axial part of the outer wall of the second rubber cloth roller 38. Their installation position does not conflict with the horizontal axis rod 47. The intelligent temperature control component 53 has a built-in probe that passes through the second rubber cloth roller 38 and enters the interior of the second rubber cloth roller 38.

[0040] The rotary joint 42 is existing technology; it is a sealed rotary connector for 360° rotating medium transport. Cooling water inside the water-cooled tank 44 passes through the rotary joint 42 via the circulation pipe 43 and enters the hollow shaft 40 and the interior of the rubber blanket roller 37. Through multiple meandering plates 46, due to the positional relationship of each plate 46, the cooling water passes through the gap between the chamfered end of the cylinder 45 and the side of the rubber blanket roller 37 to enter the various meandering channels. In this state, the water flow is obstructed, increasing the amount of cooling water inside the rubber blanket roller 37. The dwell time is increased, thereby improving the cooling effect on the blanket roller 37. When the power control unit 52 receives the start signal, it transmits a signal to the heating tube assembly 49. Since each heating tube surrounds the internal space of the blanket roller 38, each heating tube immediately generates heat and quickly fills the internal space of the blanket roller 38, raising the temperature of the blanket roller 38. The above structure controls the surface temperature of the blanket roller 37 and the blanket roller 38 to a certain extent, causing the solvent in the center of the ink to evaporate, which is beneficial to improving the printing effect. The cooling water passing through the interior of the blanket roller 37 will eventually return to the interior of the water cooling box 44 through another circulation pipe 43 to achieve water circulation. The circulating water pump sends the water to be cooled in the water tank to the evaporator for heat exchange. The refrigerant in the evaporator absorbs the heat of the water and evaporates into steam. The steam is sucked into the compressor and compressed into a high-temperature and high-pressure gas. The gas enters the condenser, is cooled and condensed into liquid. The liquid flows back to the water tank through the pipe or continues to participate in the next cycle. The setting of each ceramic support frame 50 further increases the heating tube assembly 49. The overall stability ensures that the heating elements do not come into contact with the inner wall of the rubber blanket roller 38 as it rotates, and they remain in a stable state. The insulation layer 51 protects the wires used for electrical connection. The probe of the intelligent temperature control component 53 passes through the rubber blanket roller 38 and enters its interior. It can intelligently detect the temperature inside the rubber blanket roller 38 in real time and transmit the heating or cooling command to the power control component 52 to ensure that the heat generated by the heating element assembly 49 is always within a suitable range.

[0041] Example 4, please refer to Figures 1 to 16Based on Embodiment 1, a second motor 55 is fixedly connected inside the mounting groove 2. A main gear 54 is fixedly connected to one end of the output shaft of the second motor 55. Drive gears 48 are fixedly connected to the outer walls of the two horizontal shafts 47. The main gear 54 and drive gears 48 mesh with each other. Drive gears 41 are fixedly connected to the outer walls of the two hollow shafts 40. Drive gears 48 mesh with drive gears 41 and the impression cylinder 39. A first motor 3 is fixedly connected to the bottom of the inner wall of the mounting groove 2. A precision lead screw 4 is fixedly connected to one end of the output shaft of the first motor 3. A part of the precision lead screw 4 and the entire first motor 3 are located inside the mounting groove 2. The top end of the precision lead screw 4 passes through the top end of the offset printing machine body 1 and... The mounting slot 2 is rotatably connected to the interior of the offset printing machine body 1. Two ventilation slots are provided on the side of the mounting slot 2. The ends of the two ventilation slots are provided with partitions. Side blocks 6 are provided on both outer walls of the offset printing machine body 1. Top blocks 7 and rectangular slots 9 are fixedly connected to the outer walls of the two side blocks 6 that are close to each other. The rectangular slots 9 are located below the top blocks 7. The top of the precision lead screw 4 is rotatably connected to the interior of the top block 7. The outer wall of the precision lead screw 4 is threadedly connected to the base block 5. The receiving block 27 is fixedly connected between the two base blocks 5. The bottom of the top block 7 and the top of the offset printing machine body 1 are fixedly connected to two sliding rods 8 that are far apart from each other and symmetrically distributed. The interior of the base block 5 and the outer walls of the two sliding rods 8 are slidably connected.

[0042] The two ventilation slots are positioned on the same horizontal line as motor 3 and motor 2 55, respectively. These slots facilitate proper heat dissipation for motors 3 and 2 55. The mesh screen prevents external debris from entering, ensuring the normal operation of motor 2 55 (responsible for starting) and both motors 3. The starting of motor 2 55 drives the main gear 54, which in turn drives the meshing drive gear 41 and the impression cylinder 39. The rotation of drive gear 41 then drives the blanket cylinder 37, thus completing the basic offset printing process. The starting of motor 3 drives the precision lead screw 4, which... The two sliding rods 8 restrict the displacement of the base block 5, preventing it from rotating with the precision lead screw 4. It can only move vertically. The two sliding rods 8 also increase the stability of the base block 5 during movement. The receiving block 27, which is fixedly connected between the two base blocks 5, will also move synchronously and in the same direction. This means that the distance between each inkjet head 28 and the blanket roller 37 can be precisely controlled, ensuring that the small nozzle of the inkjet head 28 and the blanket roller 37 maintain a distance of 0.5mm, and ensuring that the ink droplets will not deform due to gravity during the printing process.

[0043] Example 5, please refer to Figures 1 to 16Based on Embodiment 4, the rectangular groove 9 is concave in shape. A rack 10 is fixedly connected to one side of the inner wall of the rectangular groove 9. A toothed column 11 with a shaft meshes with the outer wall of the rack 10. Two spaced-apart stabilizing plates 12 are fixedly connected to the outer wall of the base block 5 near the side block 6. The toothed column 11 with a shaft is rotatably connected between the two stabilizing plates 12. The interior of the base block 5 has a square through groove 19 and a circular through groove 20 that are internally interconnected. A crossbar 14 is rotatably connected between the inner walls of the two sides of the square through groove 19. The outer wall of the crossbar 14... A connecting belt 13 is connected to the outer wall of the shaft of the toothed column 11. The connecting belt 13 is located between the toothed portion of the toothed column 11 and one of the stabilizing plates 12. A helical gear 15 is fixedly connected to the outer wall of the crossbar 14. A meshing assembly 16 meshes with the outer wall of the helical gear 15. The meshing assembly 16 is rotatably connected to the bottom end of the inner wall of the square through groove 19. The meshing assembly 16 includes a short shaft, a helical gear 2 and a horizontal gear fixedly connected to the outer wall of the short shaft. The helical gear 2 meshes with the helical gear 15. The circular through groove 20... A cylindrical box 17 is rotatably connected to the inner wall. An annular groove is formed on the outer wall of the cylindrical box 17. A ring gear 18 is fixedly connected to the inner wall of the annular groove. The horizontal gear and the ring gear 18 are meshed. An inner groove 21 is formed inside the cylindrical box 17. A lubricating element 24 is fixedly connected to the bottom end of the inner wall of the inner groove 21. A limiting ring 22 is fixedly connected to the top end of the lubricating element 24. Multiple equidistant connecting blocks 23 with chamfered tops are fixedly connected between the limiting ring 22 and the inner wall of the cylindrical box 17. 24 includes polyurethane (PU) foam and a brush layer fixed inside the polyurethane (PU) foam. The brush layer is movably connected to the outer wall of the precision lead screw 4. An oil injection channel 25 is provided inside the base block 5. The inside of the oil injection channel 25 is connected to the outside and the inside of the square through groove 19. One end of the oil injection channel 25 is located above the connecting block 23. Multiple equidistant balls 26 are provided at the bottom of the cylindrical box 17 and are circumferentially distributed around the axis of the cylindrical box 17. Each ball 26 is in a rolling connection with the bottom of the inner wall of the circular through groove 20.

[0044] The rack 10 and the spur gear 11 are connected by a rack 10. Since the spur gear 11 is rotatably connected between two stabilizing plates 12, and the two stabilizing plates 12 are fixedly connected to the outer wall of the base block 5, the spur gear 11 will move synchronously with the base block 5. During this displacement, it will continuously rotate due to the meshing of the rack 10. Through the connecting belt 13, the crossbar 14 will rotate synchronously, causing the helical gear 15, which is sleeved and fixedly connected to the outer wall of the crossbar 14, to also rotate. Because the helical gear 15 meshes with the helical gear 2 in the meshing assembly 16, it will also rotate with the helical gear 15. The meshing assembly 16, which is fixed to the outer wall of the short shaft, also rotates synchronously. Through the ring gear 18 and the horizontal gear, it drives the cylindrical box 17 to rotate inside the circular through groove 20. The lubricating component 24, which is fixedly connected between the inner cavity of the inner groove 21 and the limiting ring 22, also rotates synchronously and continuously wipes the outer wall of the precision lead screw 4, thereby reducing resistance and completing lubrication. This facilitates the precise displacement of each inkjet head 28. Before use, a certain amount of lubricating oil can be drawn from the lubricating component 24 using a syringe and injected through the oil injection channel 25, as per the instruction manual. Figure 5 It is known that the lubricating oil will flow into the cylindrical box 17 located inside the circular channel 20 under its own gravity and the inclined path. Since one end of the oil injection channel 25 is located above the connecting block 23, the lubricating oil will eventually pass through the cylindrical box 17, the limiting ring 22, and the gap between the two adjacent connecting blocks 23, and flow onto the lubricating component 24. If it flows onto the connecting block 23, the chamfered end of the connecting block 23 can also prevent the lubricating oil from stagnating. Due to its material properties, the lubricating component 24 can absorb and store the lubricating oil. The lubricating oil is then transferred to several brushes in the brush layer. When the lubricating component 24 rotates, the brushes exert a slight force on the outer wall of the precision lead screw 4, and apply the lubricating oil to the outer wall of the precision lead screw 4. Through the set ball bearings 26, the friction mode between the bottom surface of the cylindrical box 17 and the bottom end of the inner wall of the circular through groove 20 is changed from sliding friction to rolling friction, which reduces resistance, improves the smoothness of the rotation of the cylindrical box 17, and thus improves the application effect of the lubricating oil, which helps to extend the service life of the precision lead screw 4 and ensures the precise displacement of the receiving block 27.

[0045] In actual use, when the ink pump 34 receives a start signal, the ink inside the storage tank 36 is delivered to the ink tank 31 for temporary storage via the output pipe 35 and the action of the ink pump 34. When the precision metering pump 32 receives a start signal, the ink inside the ink tank 31 enters the precision metering pump 32 via the extraction pipe 1. The precision metering pump 32 can control the amount of ink flowing out from the extraction pipe 2 30 to ensure accurate ink supply. This ink eventually enters the solenoid valve 29 via the extraction pipe 2 30. The solenoid valve 29 can be opened and closed to achieve on-demand ink supply. This ink finally enters the print head 28 via the vertical pipe and is ejected through several small nozzles of the print head 28. Combined with the solenoid valve 29, on-demand ink ejection is achieved, improving printing accuracy and quality, and enhancing production efficiency. The system improves production efficiency and flexibility by incorporating a rack 10, a shafted toothed column 11, a connecting belt 13, a meshing assembly 16, and a cylindrical box 17. The lubricating element 24 is activated as the distance between the inkjet head 28 and the blanket cylinder 37 is adjusted, simultaneously applying lubricating oil to the outer wall of the precision lead screw 4. This extends the lifespan of the precision lead screw 4 and ensures precise displacement of the receiving block 27. It maintains a 0.5mm gap between the small nozzle of the inkjet head 28 and the blanket cylinder 37, ensuring that ink droplets do not deform due to gravity during the printing process. Replacing the printing plate cylinder in the existing structure with a blanket cylinder is equivalent to using two blanket cylinders for ink transfer, accelerating the evaporation of solvents in the ink and preventing ink droplet enlargement. This structure and system maintain the vitality of the offset printing machine and adapt to variable data printing requirements.

[0046] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A digital inkjet system based on a conventional offset press, comprising an ink delivery system, an inkjet control system and the offset press original equipment, characterized in that: The ink conveying system comprises an ink barrel (31), a precision metering pump (32) and a storage tank (36), the inside of the storage tank (36) is filled with pre-prepared oil-in-water emulsion ink, the inkjet control system comprises a solenoid valve (29) and a second extraction pipe (30), the original device of the offset press comprises an offset press body (1), an accommodating block (27) and a temperature control mechanism arranged on the offset press body (1), the temperature control mechanism comprises temperature control piece one and temperature control piece two, the bottom end of the accommodating block (27) is fixedly installed with an inkjet head (28), the solenoid valve (29) is installed inside the accommodating block (27), the solenoid valve (29) and the inkjet head (28) are fixedly communicated with a vertical pipe, the ink barrel (31) is fixedly connected to the top end of the accommodating block (27), the precision metering pump (32) is fixedly connected to the top end of the ink barrel (31), the top end of the storage tank (36) is fixedly connected with an ink pump (34), the ink pump (34) and the storage tank (36) are fixedly connected and communicated with an output pipe (35), the ink pump (34) and the ink barrel (31) are fixedly connected and communicated with a corrugated pipe (33), the precision metering pump (32) and the ink barrel (31) are fixedly communicated with a first extraction pipe, and the second extraction pipe (30) is fixedly communicated between the precision metering pump (32) and the solenoid valve (29). The inside of the body (1) is provided with an installation groove (2), the inner wall bottom of the installation groove (2) is fixedly connected with a motor one (3), one end of the output shaft of the motor one (3) is fixedly connected with a precision lead screw (4), a part of the precision lead screw (4) and the motor one (3) are located in the inside of the installation groove (2), the top end of the precision lead screw (4) passes through the top end of the body (1) and is in a rotating connection relationship with the inside of the body (1), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6), the both sides of the body (1) are provided with side blocks (6),The outer wall of the cylindrical box (17) is provided with an annular groove, the inner wall of the annular groove is fixedly connected with an annular gear (18), the horizontal gear and the annular gear (18) are in meshing connection, the inside of the cylindrical box (17) is provided with an inner groove (21), the inner wall bottom end of the inner groove (21) is fixedly connected with a lubricating part (24), the lubricating part (24) comprises polyurethane (PU) foam and a brush layer fixed to the inner side of the polyurethane (PU) foam, and the brush layer is movably connected with the outer wall of the precision lead screw (4).

2. A digital inkjet system based on a conventional offset press according to claim 1, characterized in that: The second extraction pipe (30), the ink barrel (31), the precision metering pump (32), the corrugated pipe (33) are regarded as an integral mechanism, the top end of the accommodating block (27) is provided with a plurality of integral mechanisms which are equidistant and arrayed, the ink pump (34) and the output pipe (35) also have a plurality of, a plurality of the ink pump (34) and the output pipe (35) are equidistant and arrayed at the top end of the storage tank (36), the inkjet head (28), the vertical pipe and the solenoid valve (29) also have a plurality of, a plurality of the inkjet head (28) are equidistant and arrayed at the bottom end of the accommodating block (27), and a plurality of the vertical pipe and the solenoid valve (29) are equidistantly arranged in the accommodating block (27).

3. A digital inkjet system based on a conventional offset press according to claim 1, characterized in that: The temperature control piece contains a water cooling box (44), the inner wall of the offset printing machine body (1) is rotatably connected with rubber blanket cylinder one (37), rubber blanket cylinder two (38) and impression cylinder (39) between both ends, both ends of the rubber blanket cylinder one (37) are fixedly connected with hollow shaft (40), the hollow shaft (40) is rotatably connected with the inner wall of the offset printing machine body (1) and the end portion thereof is located in the inside of the mounting groove (2), one end of the hollow shaft (40) is fixedly connected and communicated with the rotary joint (42), the rotary joint (42) is fixedly connected in the inside of the mounting groove (2), one end of the two rotary joints (42) is fixedly connected and communicated with the circulating pipe (43), one part of the circulating pipe (43) is fixedly connected in the inside of the mounting groove (2), another part of the circulating pipe (43) is fixedly connected on the outer wall of the offset printing machine body (1), the ends of the two circulating pipes (43) are respectively communicated with both ends of the same water cooling box (44), the water cooling box (44) is arranged at the bottom end of the offset printing machine body (1).

4. A digital inkjet system based on a conventional offset press according to claim 3, characterized in that: The inside of the water cooling box (44) is provided with a compressor, a condenser, an evaporator, a circulating water pump, a plurality of copper pipes and water pipes, the copper pipes are used for connecting between the compressor and the evaporator, between the evaporator and the condenser and between the compressor and the condenser, the circulating water pump is connected with the water inlets and outlets of the evaporator and the condenser through the water pipes, forming a closed cooling water circulation system.

5. A digital inkjet system based on a conventional offset press according to claim 3, characterized in that: The rubber blanket cylinder one (37) is fixedly connected with a cylinder (45) between the inner walls of both sides, both end portions of the cylinder (45) are chamfered, the length of the cylinder (45) is slightly smaller than the rubber blanket cylinder one (37) and the diameter of the bottom circle is also smaller than the rubber blanket cylinder one (37), a plurality of serpentine plates (46) which are equidistant and rotatably distributed about the axis of the cylinder (45) are fixedly connected between the outer wall of the cylinder (45) and the inner wall of the rubber blanket cylinder one (37), a serpentine channel is formed between every two adjacent serpentine plates (46).

6. A digital inkjet system based on a conventional offset press according to claim 3, characterized in that: The temperature control piece two comprises an electric heating tube assembly (49), both sides of the rubber blanket cylinder two (38) are fixedly connected with horizontal shaft rods (47), the horizontal shaft rods (47) are rotationally connected with the inner wall of the offset printing machine body (1) and the end portions thereof are located in the interiors of the mounting grooves (2), the electric heating tube assembly (49) is arranged in the interior of the rubber blanket cylinder two (38), the electric heating tube assembly (49) is formed by a plurality of independent electric heating tubes which are communicated in a manner of surrounding the axis of the rubber blanket cylinder two (38) and are equidistant, four equidistantly arranged ceramic support frames (50) are fixedly connected between the outer wall of each electric heating tube and the inner wall of the rubber blanket cylinder two (38), a heat insulation layer (51) is fixedly connected between one end of the electric heating tube assembly (49) and the inner wall of one side of the rubber blanket cylinder two (38), a wire is arranged in the interior of the heat insulation layer (51), one end of the wire penetrates through the outer wall of the rubber blanket cylinder two (38) and is connected with a power supply control piece (52), the outer wall of the rubber blanket cylinder two (38) is provided with an intelligent temperature control assembly (53), the power supply control piece (52) and the intelligent temperature control assembly (53) are fixedly connected at the non-axle center of the outer wall of the rubber blanket cylinder two (38), the mounting positions thereof do not conflict with the horizontal shaft rods (47), the intelligent temperature control assembly (53) is provided with a detection head which penetrates through the rubber blanket cylinder two (38) and reaches the interior of the rubber blanket cylinder two (38).

7. A digital inkjet system based on a conventional offset press according to claim 6, characterized in that: The interiors of the mounting grooves (2) are fixedly connected with motors two (55), one end of the output shaft of the motor two (55) is fixedly connected with a main gear (54), the outer walls of the two horizontal shaft rods (47) are fixedly connected with drive gears two (48), the main gear (54) and the drive gears two (48) are in meshing relationship, the outer walls of the two hollow shaft rods (40) are fixedly connected with drive gears one (41), the drive gears two (48), the drive gears one (41) and the impression cylinder (39) are in meshing relationship, the side surfaces of the mounting grooves (2) are provided with two air permeation grooves, the end portions of the two air permeation grooves are provided with screen meshes.

8. A digital inkjet system based on a conventional offset press according to claim 7, characterized in that: The top end of the lubricating piece (24) is fixedly connected with a limiting ring (22), a plurality of equidistantly arranged connecting blocks (23) which are provided with top end chamfers are fixedly connected between the limiting ring (22) and the inner wall of the cylindrical box (17), the interior of the base block (5) is provided with an oil injection channel (25), the interior of the oil injection channel (25) is in intercommunication with the outside and the interior of the circular groove (20), one end of the oil injection channel (25) is located above the connecting block (23), the bottom end of the cylindrical box (17) is provided with a plurality of equidistantly arranged and circumferentially distributed around the axis of the cylindrical box (17) rolling balls (26), each rolling ball (26) is in rolling connection relationship with the inner wall bottom end of the circular groove (20).

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