CN116787767A - Color mixing mechanism of full-color-gamut true-color FDM3D printer - Google Patents

Abstract

The invention discloses a color mixing mechanism of a full-color gamut true-color FDM 3D printer, which includes a color mixing outer cylinder arranged in a vertical direction. Multiple groups of feeding devices are evenly distributed around the outer wall of the color mixing outer cylinder. The number of groups of feeding devices is related to the number of printing units. The number of color types of the wire materials is the same. A color mixing shaft is coaxially arranged inside the color mixing outer cylinder, and a driving device is connected to the upper end of the color mixing shaft. The present invention can enable full-color gamut true-color 3D printing to achieve accurate and even mixing of color materials.

Description

Full color gamut true color FDM 3D printer color mixing mechanism

Technical field

The invention belongs to the technical field of 3D printing equipment design and manufacturing, and relates to a color mixing mechanism of a full-color gamut true color FDM 3D printer.

Background technique

At present, FDM 3D printing has become very common. Due to its low price and high quality, it has been widely used in many fields. However, color FDM3D printing is so far limited to multi-nozzle color printing, and full-color gamut true-color FDM3D printing has not yet been achieved. The reason is that FDM3D printing melts the filament and squeezes it onto the printing work surface, while full-color gamut true-color FDM3D printing requires filaments of different colors to be melted and mixed to form the required color, which not only includes color In terms of management, it is more important to ensure that the transmission ratio of the wire does not change during the transmission process (the final color is closely related to the proportion of each primary color), and that it must be mixed evenly. Therefore, the color mixing mechanism is required not only to achieve accurate proportional transmission of each filament, but also to mix the mixed part evenly, which is the core of the full-color gamut true color FDM 3D printer; therefore, it is necessary to design a color mixing mechanism, which not only assumes the role of The proportion of color materials is accurate, and it is necessary to ensure that each color material is fully mixed and the color is evenly mixed.

Contents of the invention

The purpose of the present invention is to provide a color mixing mechanism for a full-color gamut true-color FDM 3D printer, which can enable full-color gamut true-color 3D printing to achieve accurate and even mixing of color materials.

The technical solution adopted by the present invention is that the color mixing mechanism of a full-color gamut true-color FDM 3D printer includes a color mixing outer cylinder arranged in the vertical direction. Multiple groups of feeding devices are evenly distributed around the outer wall of the color mixing outer cylinder. The groups of feeding devices The number is the same as the number of color types of the printing filament. A color mixing shaft is coaxially arranged inside the color mixing outer cylinder, and a driving device is connected to the upper end of the color mixing shaft.

The invention is also characterized by:

Each group of feeding devices includes a feeding seat plate. The feeding seat plate is set on the outer wall of the mixing outer cylinder. A heating seat is installed on the feeding seat plate. A heating tube is embedded in the heating seat. One end of the heating seat is provided with a connection Joint, a material passing sleeve is installed at the center of the connecting joint, and a feed joint is installed at the other end of the heating seat. The feed joint is just connected with the feed port on the outer wall of the color mixing outer cylinder, and the feed port is connected to the color mixing outer cylinder. internal connectivity.

The color mixing shaft is sequentially processed along the length direction of the axis with a front shaft part, a shaft shoulder and a feed compression area. The end of the color mixing shaft away from the front shaft part has a number of color mixing pins evenly arranged along the circumferential direction, and the shoulder and the mixing pins are The area between is provided with a push thread.

The color mixing pins are arranged in six turns along the circumferential direction of the color mixing axis.

The front shaft of the extrusion mixing shaft is covered with a bearing. The bearing is installed at the upper mouth of the mixing outer cylinder through the bearing seat. A bearing pressure plate is installed at the upper mouth of the mixing outer cylinder. The bearing pressure plate presses the outer ring of the bearing. The mixing outer cylinder The lower end is equipped with a discharge port.

The wire material is fed into the material passing sleeve through the corresponding wire feeding stepper motor on the feeding rack. The wire material passes through the material passing sleeve and enters the connecting joint, and then passes through the heating seat, feeding joint and feeding port in sequence. Go inside the mixed color outer barrel.

The beneficial effects of the present invention are as follows:

1. It can be realized that after the CMYKW five-color wire materials are fed into the color mixing mechanism in the required proportion, the proportion of each color material is stable under the action of the extrusion and mixing shaft;

2. It can achieve complete and uniform mixing after mixing in proportion.

Description of the drawings

Figure 1 is an overall view of the full-color gamut true color FDM 3D printer of the present invention;

Figure 2 is a front view of the color mixing mechanism of the full color gamut true color FDM 3D printer of the present invention;

Figure 3 is a top cross-sectional view of the color mixing mechanism of the full-color gamut true-color FDM 3D printer of the present invention;

Figure 4 is a front view of the extrusion mixing shaft in the color mixing mechanism of the full color gamut true color FDM 3D printer of the present invention;

Figure 5 is a diagram of the pin shape of the mixing unit magnified 8 times at point A in the extrusion mixing shaft in Figure 4.

In the picture, 1. FDM 3D printer, 2. Color mixing mechanism, 3. Feeding rack, 4. Extrusion mixing shaft, 5. Color mixing outer cylinder, 6. Bearing, 7. Bearing pressure plate, 8. Coupling, 9. Motor support , 10. Set screw, 11. Stepper motor, 12. Screw A, 13. Screw B, 14. Screw C, 15. Feed seat plate, 16. Feed sleeve, 17. Wire material, 18. Connection Joint, 19. Heating seat, 20. Heating tube, 21. Feed joint, 22. Feed port, 23. Screw D, 24. Color mixing pin, 25. Pushing thread, 26. Feed compression area, 27. Sealing shoulder, 28. Front shaft part, 29. Wire feeding stepper motor, 30. Discharge port.

Detailed ways

The present invention will be described in detail below with reference to the drawings and specific embodiments.

The color mixing mechanism of the full-color gamut true-color FDM3D printer of the present invention is applied to the full-color gamut true-color FDM3D printer as shown in Figure 1. On the basis of the original FDM3D printer, the full-color gamut true-color FDM3D printer color mixing mechanism 2 is designed to replace the original The print head is installed on the FDM 3D printer 1. In addition, the system is equipped with a feed rack 3. A total of 5 filaments are placed on the feed rack 3, which are cyan, magenta, yellow, black and white filaments. The best way is to mix colors using the subtractive color method. Each wire material is fed into the color mixing mechanism 2 through the corresponding wire feeding stepper motor 29 on the feed rack 3 .

Example 1

The color mixing mechanism of the full-color gamut true color FDM 3D printer of the present invention is the color mixing mechanism 2 in Embodiment 1. As shown in Figure 2, the color mixing mechanism 2 includes a color mixing outer cylinder 5, and an extrusion mixing shaft 4 is coaxially installed in the color mixing outer cylinder 5. Since five types of wire materials are fed, five sets of feeding devices are evenly installed in the circumferential direction of the mixing color outer cylinder 5, as shown in Figure 3. Since the structures of the five sets of feeding devices are exactly the same, only one of them is shown in Figure 2. The structure of the feeding device is described in detail.

Each set of feeding device includes a feeding seat plate 15. The feeding seat plate 15 is connected to the outer wall of the color mixing outer cylinder 5 through screws C14. A heating seat 19 is also connected to the outside of the feeding seat plate 15. The connecting joint 18 is installed through threads. At one end of the heating base 19, a heating tube 20 is installed on the heating base 19. The heating seat 19 is installed on the feed seat plate 15 through screws D23. The other end of the heating seat 19 is equipped with a feed joint 21. The feed joint 21 is close to the feed port 22 on the color mixing outer cylinder 5. The port 22 is connected with the inside of the color mixing outer cylinder 5 . Each wire material is conveyed through the corresponding wire feeding stepper motor 29 on the feed rack 3 through the material passing sleeve 16, and the other end of the material passing sleeve 16 is connected to the connecting joint 18 on the color mixing mechanism 2.

Example 2

The extrusion and mixing shaft 4 is the core of the color mixing mechanism 2. As shown in Figure 4, the color mixing shaft 4 includes a front shaft part 28, a sealing shoulder 27, a sloped feed compression zone 26, a pushing thread 25 and a number of color mixing pins. twenty four. After calculation, the color mixing pins 24 are arranged in six layers, and each layer is staggered from each other; the front shaft portion 28 of the extrusion mixing shaft 4 is covered with a bearing 6, and the bearing 6 is simultaneously installed on the bearing seat at the front end of the color mixing outer cylinder 5. A bearing pressure plate 7 is installed on the front end face of the mixed color outer cylinder 5 through screws A12. The bearing pressure plate 7 presses the outer ring of the bearing 6 to prevent the bearing 6 from axially shifting. Four motor supports 9 are installed on the bearing pressure plate 7 through screws B13, and the screw heads at the other ends of the motor supports 9 are installed on the mounting threaded holes of the stepper motor 11. The shaft at the front end of the stepper motor 11 is fixedly connected to the front shaft 28 of the extruding and mixing shaft 4 through the coupling 8 and the two set screws 10 thereon, so that the extruding and mixing shaft 4 can be driven to rotate.

Example 3

As shown in Figure 5, the shape of the mixed-color pin 24 is an ellipse, and the ratio of its major axis to its minor axis is 1:0.7. Calculations have shown that such a structure facilitates thorough mixing. In addition, the pitch of the pushing thread 25 is equal to the diameter of the screw rod, so that a larger pitch can ensure the accuracy of the proportion. The feed compression zone 26 is opposite to the five feed ports 22. Since it is designed with a sloped structure, it is beneficial to the continuity of the feed to the feed ports 22, and is also beneficial to the accuracy of the proportion.

The working process of the color mixing mechanism of the full color gamut true color FDM 3D printer of the present invention is as follows: during operation, the system will control the wire feeding stepper motor 29 on the feed rack 3 to feed material at different speeds according to the color mixing needs, and the wire material 17 passes through the material sleeve. The barrel 16 and the connecting joint 18 enter the heating seat 19 . The heating tube 20 on the heating base 19 heats the heating base 19 to 200 degrees Celsius, and the wire material melts here. The rear wire 17 continues to move forward driven by the wire feeding stepper motor 29 on the feed rack 3, pushing the molten wire 17 into the feed joint 21, and enters through the feed port 22 on the color mixing outer cylinder 5. The interior of the mixed color outer cylinder 5. The extrusion and mixing shaft 4 inside the color mixing outer cylinder 5 rotates driven by the stepper motor 11. After the feed compression zone 26 on it receives the feed, it moves downward under the action of the pushing thread 25 on it. The materials fed into the five feed ports will be compressed by the pushing thread 25 and move downward. Entering the color mixing area composed of the color mixing pins 24, the molten color material is continuously mixed under the action of the color mixing pins 24 because the material behind is continuously pushed forward. After six layers, it is completely mixed and extruded through the outlet 30 at the bottom of the color mixing outer cylinder 5 for printing and accumulation to form a 3D printing effect.

The color mixing mechanism of the full-color gamut true-color FDM 3D printer of the present invention can not only ensure the proportional accuracy of wire transmission, but also ensure the full mixing of molten wire. The color mixing mechanism provided by the present invention can provide reliable support for FDM 3D printing to achieve full-color gamut printing effects.

Claims (6)

1. The color mixing mechanism of a full-color gamut true-color FDM 3D printer is characterized by: including a color mixing outer cylinder (5) arranged along the vertical direction. Multiple sets of feeding devices are evenly distributed around the outer wall of the color mixing outer cylinder (5). The number of groups of feeding devices is the same as the number of color types of printing filaments. A color mixing shaft (4) is coaxially arranged inside the color mixing outer cylinder (5), and a driving device is connected to the upper end of the color mixing shaft (4). 2. The color mixing mechanism of a full-color gamut true color FDM 3D printer according to claim 1, characterized in that: each group of the feeding devices includes a feeding seat plate (15), and the feeding seat plate (15) is arranged outside the color mixing On the outer wall of the barrel (5), a heating seat (19) is installed on the feed seat plate (15). A heating pipe (20) is embedded in the heating seat (19). One end of the heating seat (19) is provided with a connecting joint. (18), a material passing sleeve (16) is installed at the center of the connecting joint (18), and a feeding joint (21) is installed at the other end of the heating seat (19). The feeding joint (21) is exactly in line with the color mixing opening. The feed port (22) on the outer wall of the outer cylinder (5) is docked, and the feed port (22) is connected with the inside of the color-mixing outer cylinder (5). 3. The color mixing mechanism of a full-color gamut true color FDM 3D printer according to claim 2, characterized in that: the color mixing shaft (4) is sequentially processed with a front shaft part (28) and a shaft shoulder (27) along the length direction of the axis. and the feed compression zone (26). A number of color mixing pins (24) are evenly arranged along the circumferential direction at the end of the color mixing shaft (4) away from the front shaft portion (28), and the shoulder (27) is in contact with the color mixing pin (24). The area between 24) is provided with a pushing thread (25). 4. The color mixing mechanism of a full-color gamut true color FDM 3D printer according to claim 3, characterized in that: the color mixing pin (24) is provided with six circles in sequence along the circumferential direction of the color mixing axis (4). 5. The color mixing mechanism of a full-color gamut true color FDM 3D printer according to claim 3, characterized in that: the front shaft portion (28) of the extrusion mixing shaft (4) is covered with a bearing (6), and the bearing (6) It is installed at the upper mouth of the mixing color outer cylinder (5) through the bearing seat. A bearing pressure plate (7) is installed at the upper mouth of the mixing color outer cylinder (5). The bearing pressure plate (7) presses the outer ring of the bearing (6). The lower end of the outer cylinder (5) is provided with a discharge port (30). 6. The feeding method of the color mixing mechanism of the full-color gamut true-color FDM 3D printer according to claims 1 to 5, characterized in that: the wire feeding stepper motor (29) on the feeding rack (3) is used to feed the wire material. (17) is fed into the material passing sleeve (16). The wire material (17) passes through the material passing sleeve (16) and then enters the connecting joint (18), and then passes through the heating seat (19) and the feeding joint (17) in sequence. 21) and the feed port (22) enter the interior of the color mixing outer cylinder (5).