High-stability constant-pressure three-dimensional jet printing machine

Abstract

The application relates to a high-stability constant-pressure three-dimensional jet printing machine, which comprises an outer frame, an executor fixedly arranged in the inner part of the outer frame, a bottom disc bolt arranged at the lower end edge of the outer frame, and a fixed disc fixedly connected to the lower end of the outer frame. A piezoelectric ceramic executor is arranged in the three-dimensional jet printing machine, which aims to solve the problem of insufficient coupling of a traditional driving module and an ink path system, can eliminate the strip-shaped printing defects, and can better match the ink path by virtue of the characteristics of quick response and precise regulation of the executor. The application has the effects of reducing the steady-state error of ink pressure, being more timely in real-time correction of ink pressure fluctuation, avoiding the deviation of the shape of liquid drops caused by unstable pressure, improving the synergy of driving and ink supply, making the jet printing process more stable, improving the pattern precision and consistency of output, and enhancing the working reliability of the whole equipment.

Description

Technical Field

[0001] This application relates to the field of engineering 3D printer technology, and in particular to a high-stability constant-pressure 3D inkjet printer. Background Technology

[0002] This technology is mainly applicable to high-precision image output scenarios such as outdoor advertising inkjet printing and industrial signage printing, and is especially suitable for large-format printing jobs with stringent requirements for ink droplet positioning accuracy and ink pressure stability.

[0003] Current advertising printers generally employ thermal inkjet or continuous inkjet technology, whose droplet positioning accuracy is limited by mechanical transmission errors (typically ±20μm) and ink pressure fluctuations (steady-state error of approximately 10%). In recent years, piezoelectric ceramic drive technology has been gradually applied to industrial printheads, but its dynamic response characteristics and matching with the ink path system still exhibit a hysteresis effect, leading to ink splatter and trailing phenomena during high-speed printing. Furthermore, traditional ink paths employ a straight-through flow channel design, and uneven fluid resistance distribution easily induces localized turbulence, further exacerbating ink pressure fluctuations. Utility Model Content

[0004] In order to improve the steady-state error of ink pressure and avoid the problem of poor coupling of ink path system, this application provides a high-stability constant pressure three-dimensional inkjet printer.

[0005] This application provides a high-stability constant-pressure three-dimensional inkjet printer, employing the following technical solution: A high-stability constant-pressure three-dimensional inkjet printer includes an outer frame. An actuator is fixedly installed inside the outer frame. A chassis bolt is provided at the lower edge of the outer frame. A fixed plate is fixedly connected to the lower end of the outer frame. An operating shaft is installed through the center of the front surface of the actuator to the front surface of the outer frame. A ball joint pin is installed at the front end of the operating shaft. A ball joint rod is provided on the front surface of the ball joint pin. A ball is welded to the front end of the ball joint rod. A ball seat is rotatably provided on the outer circumferential surface of the ball. A connecting shaft is provided at the front end of the ball seat. A fixing pad is connected to the front end of the shaft, and a rear base is installed on the front surface of the fixing pad. The purpose of setting a piezoelectric ceramic actuator in the 3D inkjet printer is to solve the problem of insufficient coupling between the traditional drive module and the ink path system. This can eliminate striped printing defects. With its own fast response and precise control characteristics, the actuator can better match the ink path and reduce the steady-state error of ink pressure. The real-time correction of ink pressure fluctuations is more timely, avoiding deviations in droplet shape caused by unstable pressure. At the same time, it can improve the coordination between drive and ink supply, making the printing process more stable, improving the accuracy and consistency of the output pattern, and enhancing the overall reliability of the equipment.

[0006] In a preferred embodiment, a telescopic shaft is fixedly connected to the center of the lower surface of the fixed plate. A telescopic mechanism is installed at the lower end of the telescopic shaft, and a chassis is welded to the lower end of the telescopic mechanism. A telescopic structure is provided at the lower end of the printer actuator to enhance the adaptability of the printhead to the printing position. When the actuator operates at high frequency, it will produce a slight displacement deviation. The telescopic structure can be adjusted in length to compensate for the displacement error, ensuring that the printhead and the surface of the object to be printed maintain a fixed spraying distance, adapting to different working height requirements, avoiding ink droplet splashing due to excessive contact, reducing pattern blurring caused by positional deviation, and improving the stability of the overall printing process.

[0007] In a preferred embodiment, suction cups are installed at the four corners of the lower surface of the chassis. When the printhead is installed on the bottom surface of the printer chassis, the printhead may cause the chassis to shake during printing. The suction cups can adhere tightly to the worktable by adhering to it, increasing the contact area between the chassis and the worktable. Each movement of the printhead can be based on a stable reference, reducing pattern deviation, making the printing process more controllable, and improving the consistency and reliability of the finished product.

[0008] In a preferred embodiment, an ink chamber is installed on the front surface of the chassis. An ink chamber opening is located on the upper surface of the ink chamber near the right edge, and a sensor group is located on the upper surface of the ink chamber near the left edge. The sensor group, which includes pressure, temperature, and displacement sensors, is installed on the upper surface of the ink chamber of the printer. This sensor group is mainly used to monitor the ink chamber's operating conditions in real time to ensure printing stability. The MEMS pressure sensor closely monitors ink pressure fluctuations to avoid deviations in ejection volume due to abnormal pressure. The PT100 temperature sensor tracks temperature changes within the chamber to prevent temperature fluctuations from affecting ink viscosity. The capacitive displacement sensor captures minute displacements of the ink chamber or printhead to prevent misalignment caused by positional shifts. The synchronous feedback of multiple parameters allows the control system to adjust in a timely manner, reducing printing defects caused by environmental changes and improving the reliability of the printing process and the consistency of the finished product.

[0009] In a preferred embodiment, a counterweight is installed on the rear surface of the chassis. The purpose of setting the counterweight at the rear end of the inkjet printer chassis is to balance the weight of the front ink chamber. After the ink chamber is filled with ink, it has a certain mass. When the equipment is running, it is easy to cause the center of gravity of the chassis to tilt forward, causing positioning deviation. The counterweight adjusts the overall weight distribution, so that the chassis is subjected to more uniform force and the running state is more stable.

[0010] In a preferred embodiment, an ink inlet hole is provided at the lower end of the rear surface of the rear base, and an ink supply pipe is connected inside the ink inlet hole. In a three-dimensional inkjet printer, the ink chamber is connected to the ink supply pipe. Independent ink chambers are prone to internal pressure fluctuations due to consumption, which affects the jetting stability. The ink supply pipe can replenish ink in time and balance the pressure changes inside the chamber.

[0011] In a preferred embodiment, a fixing bolt is installed at the connection between the rear surface of the outer frame and the actuator. In the 3D inkjet printer, the actuator and the outer frame are connected by fixing bolts. The bolt connection can effectively limit the shaking between the actuator and the outer frame. If the connection is loose, the nozzle position will shift, which will directly cause the pattern to deviate. This fixing method can also resist slight external impacts and prevent the structure from falling off.

[0012] In a preferred embodiment, a toothed ring is provided at the front end of the rear base, and a helical ring is fixedly installed at the front end of the toothed ring. An ink ejector head is provided on the front surface of the helical ring. In a 3D inkjet printer, the nozzle is designed with a tapered, converging structure primarily to address the problem of air bubble retention caused by fluid separation within the ink path during high-speed printing. The tapered design guides the fluid to flow smoothly along the narrowed path, reducing separation during flow and preventing the formation of air bubbles due to low-pressure areas. With fewer air bubbles, the ink flow is smoother, and the ink droplet shape is stable during ejection, preventing ink breaks, ink splatter, or pattern defects. This adjustment not only makes high-speed printing more consistent but also improves the uniformity and accuracy of the pattern.

[0013] In a preferred embodiment, the upper surface of the chassis has hollowed-out slots at both ends. The purpose of hollowing out the chassis of the three-dimensional inkjet printer is to reduce the weight of the whole machine. This not only reduces the overall weight but also avoids weakening the rigidity of the structure. The lightweight chassis makes the equipment more flexible in operation and improves the continuity and reliability of the equipment's work.

[0014] In summary, this application includes at least one of the following beneficial technical effects: 1. The purpose of installing piezoelectric ceramic actuators in 3D inkjet printers is to solve the problem of insufficient coupling between traditional drive modules and ink path systems. This can eliminate striped printing defects. With its fast response and precise control characteristics, the actuator can better match the ink path and reduce the steady-state error of ink pressure. Real-time correction of ink pressure fluctuations is more timely, avoiding deviations in droplet shape caused by unstable pressure. At the same time, it can improve the coordination between drive and ink supply, making the printing process more stable, improving the accuracy and consistency of output patterns, and enhancing the overall reliability of the equipment.

[0015] 2. A telescopic structure is installed at the lower end of the printer actuator to enhance the adaptability of the printhead to the printing position. When the actuator operates at high frequency, it will produce slight displacement deviations. The telescopic structure can be adjusted in length to compensate for the displacement error, ensuring that the printhead and the surface of the object to be printed maintain a fixed spraying distance. This adapts to different working height requirements, avoids ink droplet splashing caused by excessive contact, reduces pattern blurring caused by positional deviation, and improves the overall stability of the printing process.

[0016] 3. In 3D inkjet printers, the nozzle is designed with a tapered, converging structure primarily to address the issue of air bubble retention caused by fluid separation within the ink flow path during high-speed printing. The tapered design guides the fluid smoothly outward along the narrowed flow path, reducing separation during flow and preventing the formation of air bubbles due to low-pressure areas. With fewer air bubbles, the ink flow is smoother, resulting in stable ink droplet shapes during ejection and eliminating ink breaks, ink splatter, or pattern defects. This adjustment not only makes high-speed printing more consistent but also improves the uniformity and accuracy of the pattern. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this application; Figure 2 This is a rear view of the overall structure of this application; Figure 3 This is a schematic diagram of the actuator structure of this application; Figure 4 This is a schematic diagram of the ball joint structure of this application; Figure 5 This is a schematic diagram of the ink dispensing structure of this application.

[0018] Explanation of reference numerals in the attached drawings: 1. Outer frame; 2. Telescopic mechanism; 3. Counterweight; 4. Chassis; 5. Ink chamber opening; 6. Ink chamber; 7. Sensor group; 8. Fixing plate; 9. Fixing bolt; 10. Telescopic shaft; 11. Hollowed-out groove; 12. Suction cup; 13. Ink supply pipe; 14. Actuator; 15. Chassis bolt; 16. Control shaft; 17. Ball joint rod; 18. Connecting shaft; 19. Ball seat; 20. Ball pin; 21. Fixing pad; 22. Gear ring; 23. Ink inlet hole; 24. Sphere; 25. Rear base; 26. Threaded ring; 27. Ink outlet head. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0020] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0021] See Figure 1-5A high-stability constant-pressure three-dimensional inkjet printer includes an outer frame 1. An actuator 14 is fixedly installed inside the outer frame 1. A chassis bolt 15 is provided at the lower edge of the outer frame 1. A fixed plate 8 is fixedly connected to the lower end of the outer frame 1. An operating shaft 16 is installed from the center of the front surface of the actuator 14 to the front surface of the outer frame 1. A ball head pin 20 is installed at the front end of the operating shaft 16. A ball head rod 17 is provided on the front surface of the ball head pin 20. A ball body 24 is welded to the front end of the ball head rod 17. A ball seat 19 is rotatably provided on the outer circumferential surface of the ball body 24. A connecting shaft 18 is provided at the front end of the ball seat 19. A fixed plate 8 is connected to the front end of the connecting shaft 18. The fixed pad 21 has a rear base 25 mounted on its front surface. The purpose of setting a piezoelectric ceramic actuator in the 3D inkjet printer is to solve the problem of insufficient coupling between the traditional drive module and the ink path system. This can eliminate striped printing defects. With its fast response and precise control characteristics, the actuator can better match the ink path and reduce the steady-state error of the ink pressure. The real-time correction of ink pressure fluctuations is more timely, avoiding deviations in droplet shape caused by unstable pressure. At the same time, it can improve the coordination between drive and ink supply, making the printing process more stable, improving the accuracy and consistency of the output pattern, and enhancing the overall reliability of the equipment.

[0022] See Figure 1-2 A telescopic shaft 10 is fixedly connected to the center of the lower surface of the fixed plate 8. A telescopic mechanism 2 is installed at the lower end of the telescopic shaft 10. A base plate 4 is welded to the lower end of the telescopic mechanism 2. A telescopic structure is set at the lower end of the printer actuator to enhance the adaptability of the printhead and the printing position. When the actuator works at high frequency, it will produce a slight displacement deviation. The telescopic structure can adjust its length to compensate for the displacement error, ensure that the printhead and the surface of the object to be printed maintain a fixed spraying distance, adapt to different working height requirements, avoid ink droplet splashing caused by too close contact, reduce pattern blurring caused by positional deviation, and improve the stability of the overall printing process.

[0023] See Figure 2 Suction cups 12 are installed at the four corners of the lower surface of the chassis 4. When the print head is installed on the bottom surface of the printer chassis, the print head may cause the chassis to shake. The suction cups can adhere tightly to the worktable by adhering to it, increasing the contact area between the chassis and the worktable. Each movement of the print head can be based on a stable reference, reducing pattern deviation, making the printing process more controllable, and improving the consistency and reliability of the finished product.

[0024] See Figure 1The ink chamber 6 is installed on the front surface of the chassis 4. The ink chamber outlet 5 is located on the upper surface of the ink chamber 6 near the right edge. The sensor group 7 is located on the upper surface of the ink chamber 6 near the left edge. The sensor group, which includes pressure, temperature and displacement sensors, is set on the upper surface of the ink chamber of the printer. It is mainly used to monitor the working condition of the ink chamber in real time to ensure the stability of printing. The MEMS pressure sensor closely monitors the ink pressure fluctuations to avoid the deviation of the ejection volume due to abnormal pressure. The PT100 temperature sensor tracks the temperature change in the chamber to prevent temperature fluctuations from affecting the ink viscosity. The capacitive displacement sensor captures the small displacement of the ink chamber or printhead to avoid misalignment caused by positional deviation. The synchronous feedback of multiple parameters allows the control system to adjust in time, reduce printing defects caused by environmental changes, and improve the reliability of the printing process and the consistency of the finished product.

[0025] See Figure 1 A counterweight 3 is installed on the rear surface of the chassis 4. The purpose of setting the counterweight at the rear end of the inkjet printer chassis is to balance the weight of the front ink chamber. After the ink chamber is filled with ink, it has a certain mass. When the equipment is running, it is easy to cause the center of gravity of the chassis to tilt forward, causing positioning deviation. The counterweight adjusts the overall weight distribution, so that the chassis is subjected to more uniform force and the running state is more stable.

[0026] See Figure 1-4 The lower end of the rear surface of the rear base 25 is provided with an ink inlet hole 23. The ink supply pipe 13 is connected inside the ink inlet hole 23. In the three-dimensional inkjet printer, the ink chamber is connected to the ink supply pipe. The independent ink chamber is prone to internal pressure fluctuation due to consumption, which affects the spraying stability. The ink supply pipe can replenish ink in time and balance the pressure changes in the chamber.

[0027] See Figure 2 A fixing bolt 9 is installed at the connection between the rear surface of the outer frame 1 and the actuator 14. In the 3D inkjet printer, the actuator and the outer frame are connected by fixing bolts. The bolt connection can effectively limit the shaking between the actuator and the outer frame. If the connection is loose, the nozzle position will shift, which will directly cause the pattern to deviate. This fixing method can also resist slight external impacts and prevent the structure from falling off.

[0028] See Figure 5 The rear base 25 has a toothed ring 22 at its front end, and a spiral ring 26 is fixedly installed at the front end of the toothed ring 22. The front surface of the spiral ring 26 has an ink outlet head 27. In a 3D inkjet printer, the nozzle is designed with a conical converging structure, mainly to address the problem of air bubble retention caused by fluid separation in the ink path during high-speed printing. The conical design guides the fluid to be ejected smoothly along the narrowed flow path, reducing separation during flow and avoiding the formation of air bubbles due to low-pressure areas. With fewer air bubbles, the ink flow is smoother, and the ink droplet shape is stable during ejection, preventing ink breaks, ink splatter, or pattern defects. This adjustment not only makes high-speed printing more consistent but also improves the consistency and accuracy of the pattern.

[0029] See Figure 1-2 The upper surface of the chassis 4 has hollowed-out slots 11 at both ends. The purpose of hollowing out the chassis of the three-dimensional inkjet printer is to reduce the weight of the whole machine. This not only reduces the overall weight but also avoids weakening the rigidity of the structure. The lightweight chassis makes the equipment more flexible in operation and improves the continuity and reliability of the equipment's work.

[0030] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-stability constant-pressure three-dimensional inkjet printer, comprising an outer frame (1), characterized in that: An actuator (14) is fixedly installed inside the outer frame (1). A chassis bolt (15) is provided at the lower edge of the outer frame (1). A fixed plate (8) is fixedly connected to the lower end of the outer frame (1). An operating shaft (16) is installed through the center of the front surface of the actuator (14) to the front surface of the outer frame (1). A ball head pin (20) is installed at the front end of the operating shaft (16). A ball head rod (17) is provided on the front surface of the ball head pin (20). A ball body (24) is welded to the front end of the ball head rod (17). A ball seat (19) is rotatably provided on the outer circumferential surface of the ball body (24). A connecting shaft (18) is provided at the front end of the ball seat (19). A fixing pad (21) is connected to the front end of the connecting shaft (18). A rear base (25) is installed on the front surface of the fixing pad (21).

2. The high-stability constant-pressure three-dimensional inkjet printer according to claim 1, characterized in that: A telescopic shaft (10) is fixedly connected to the center of the lower surface of the fixed plate (8). A telescopic machine (2) is installed at the lower end of the telescopic shaft (10). A chassis (4) is welded to the lower end of the telescopic machine (2).

3. A high-stability constant-pressure three-dimensional inkjet printer according to claim 2, characterized in that: Suction cups (12) are installed at the four corners of the lower surface of the chassis (4).

4. A high-stability constant-pressure three-dimensional inkjet printer according to claim 2, characterized in that: An ink cavity (6) is installed on the front surface of the chassis (4). An ink cavity opening (5) is provided on the upper surface of the ink cavity (6) near the right edge. A sensor group (7) is provided on the upper surface of the ink cavity (6) near the left edge.

5. A high-stability constant-pressure three-dimensional inkjet printer according to claim 2, characterized in that: A counterweight (3) is installed on the rear surface of the chassis (4).

6. A high-stability constant-pressure three-dimensional inkjet printer according to claim 1, characterized in that: The lower end of the rear surface of the rear base (25) is provided with an ink inlet hole (23), and an ink supply tube (13) is connected inside the ink inlet hole (23).

7. A high-stability constant-pressure three-dimensional inkjet printer according to claim 1, characterized in that: A fixing bolt (9) is installed at the connection between the rear surface of the outer frame (1) and the actuator (14).

8. A high-stability constant-pressure three-dimensional inkjet printer according to claim 1, characterized in that: The front end of the rear base (25) is provided with a toothed ring (22), and a spiral ring (26) is fixedly installed on the front end of the toothed ring (22). The front surface of the spiral ring (26) is provided with an ink outlet head (27).

9. A high-stability constant-pressure three-dimensional inkjet printer according to claim 2, characterized in that: The upper surface of the chassis (4) has hollowed-out grooves (11) at both ends.

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