3D printing forming device for skeleton reinforced metal material

Abstract

The invention discloses a framework reinforced metal material 3D printing forming device and relates to the technical field of 3D printing, the framework reinforced metal material 3D printing forming device comprises a forming device body, a printing frame is connected into the forming device body, a printing main shaft is connected to the lower end of the printing frame, and a telescopic groove is formed in the middle of the lower end of the printing main shaft; a telescopic groove is formed in the upper end of the printing main shaft, an inner shaft printing head is slidably connected into the telescopic groove, an inner shaft output hole is formed in the lower end of the inner shaft printing head, and an annular output groove surrounding the telescopic groove is formed in the lower end of the printing main shaft. A core-shell gradient distribution structure is formed by a printing part, grading adjustment of the printing radius is achieved through cooperation of an output hole control frame, a telescopic control plate and an arc-shaped control frame, and switching of a sequential printing mode and a synchronous printing mode is achieved through cooperation of a lifting bearing pipe and a material conveying pipe.

Description

Technical Field

[0001] This invention relates to the field of 3D printing technology, specifically to a 3D printing molding device for skeleton-reinforced metal materials. Background Technology

[0002] 3D printing technology, also known as additive manufacturing technology, is a manufacturing technology that constructs a solid object by depositing materials layer by layer based on a digital model. In recent years, 3D printing technology for metal materials has been widely used in aerospace, medical devices, and automobile manufacturing. However, existing 3D printing devices for metal materials still have the following technical shortcomings in practical applications: First, existing metal 3D printing devices typically use a single material for printing, making it impossible to achieve composite output of multiple materials in the same printing process. In engineering practice, many parts need to have different mechanical properties in different areas. For example, the outer layer needs high hardness and wear resistance, while the inner layer needs high toughness to provide structural support. Existing single-material printing methods are difficult to meet such gradient functional design requirements and require multiple printing and post-processing processes, which are complex and have low production efficiency. Secondly, in the existing 3D printing equipment, the output diameter of the print head is usually fixed during the printing process, and the output radius cannot be adjusted in real time according to the printing needs. When it is necessary to print structures with different cross-sectional sizes, it is often necessary to replace the print head, interrupt the printing process, reduce printing efficiency, and make it difficult to achieve integrated printing of continuously variable cross-section structures. Third, during the 3D printing process, the high-temperature melting of metal materials generates irritating gases and fumes, posing a potential threat to the health of operators and affecting printing quality. Existing printing devices lack effective gas collection and removal mechanisms, making it difficult to treat harmful gases in a timely manner during the printing process. Therefore, we propose a 3D printing molding device for skeleton-reinforced metal materials. Summary of the Invention

[0003] The purpose of this invention is to provide a 3D printing molding device for skeleton-reinforced metal materials.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a 3D printing molding device for skeleton-reinforced metal materials, comprising a molding device body, a printing frame connected inside the molding device body, a printing spindle connected to the lower end of the printing frame, a telescopic groove formed in the middle of the lower end of the printing spindle, an inner shaft printing head slidably connected inside the telescopic groove, an inner shaft output hole formed at the lower end of the inner shaft printing head, an annular output groove formed at the lower end of the printing spindle, and the annular output groove surrounding the telescopic groove, an output hole control frame for controlling the output radius of the inner shaft output hole connected to the lower end of the inner shaft printing head, a telescopic control plate for cooperating with the output hole control frame connected to the side of the output hole control frame near the center of the inner shaft output hole, and a telescopic hole formed on the side of the output hole control frame near the telescopic control plate, and the side of the telescopic control plate near the output hole control frame extending into the telescopic hole.

[0005] As a further embodiment of the present invention: four arc-shaped control frames are connected to one side of the output hole control frame, and arc-shaped telescopic holes are opened on the side of the four arc-shaped control frames away from the output hole control frame. Arc-shaped inner frames are slidably connected to the inner walls of the four arc-shaped telescopic holes. The four arc-shaped inner frames have different lengths and are arranged in order of different lengths. The four arc-shaped inner frames are connected to the inner wall of the arc-shaped telescopic holes near the output hole control frame by springs.

[0006] As a further aspect of the present invention: the upper end of the inner shaft print head is connected to the top wall of the telescopic groove via a return spring, a lifting support tube is connected to the middle of the upper end of the inner shaft print head, and a lifting connection hole with a blind hole structure is opened at the upper end of the lifting support tube. A side wall receiving hole is opened on the inner wall of the lifting connection hole, and a pipe hole is opened at the lower end of the lifting support tube, and the pipe hole communicates with the side wall receiving hole.

[0007] As a further embodiment of the present invention: the inner wall of the lifting connection hole is slidably connected to a conveying pipe for conveying metal materials, the top end of the conveying pipe is provided with a conveying groove, and the lower end of the side wall of the conveying pipe is provided with an outer wall conveying hole for communicating and cooperating with the side wall receiving hole, and the conveying groove is connected to the outer wall conveying hole.

[0008] As a further aspect of the present invention: the outer wall of the inner shaft printhead is rotatably connected to a control ring for controlling the position of the output hole control frame; the lower end of the inner shaft printhead has an outer control annular groove; an inner ring is rotatably connected inside the outer control annular groove; and the outer wall of the inner ring is connected to the inner wall of the control ring via a connecting block; the upper end of the output hole control frame has a connecting hole; a movable rotating shaft is rotatably connected inside the connecting hole; and the upper end of the movable rotating shaft is connected to the lower end of the inner ring; the upper end of the telescopic control plate has a through hole; a fixed rotating shaft is rotatably connected inside the through hole; and the upper end of the fixed rotating shaft is rotatably connected to the lower end of the inner shaft printhead.

[0009] As a further aspect of the present invention: the outer wall of the inner shaft printhead is connected to a fixed outer shell, the lower end of the fixed outer shell is provided with an inner chamber, and a lifting block for limiting the position of the control ring is slidably connected inside the inner chamber, the upper end of the lifting block is connected to the top wall of the inner chamber through a lifting spring.

[0010] As a further embodiment of the present invention: the upper end of the control ring is provided with a limiting groove for cooperating with the lifting block; the outer wall of the lifting block is connected to a linkage control rod, and the upper end of the linkage control rod is connected to a lifting control ring; the outer wall of the inner shaft print head is rotatably connected to a rotating rod; the outer wall of the rotating rod is actively connected to a height limiting frame for limiting the height position of the lifting control ring; and the outer wall of the inner shaft print head is connected to an angle limiting shaft for limiting the angle position of the height limiting frame.

[0011] As a further aspect of the present invention: the lower end of the printing frame is connected to an extension rod, the front end of the extension rod is provided with a translational slide groove, and a threaded rod is rotatably connected to the inner wall of the translational slide groove near the printing frame.

[0012] As a further aspect of the present invention: the outer wall of the threaded rod is helically connected to a connecting rod, and the outer wall of the connecting rod is slidably connected to the inner wall of the translational slide groove. The lower end of the connecting rod is connected to an absorption hood for absorbing printing gas, and a vacuum pump is connected to the side of the absorption hood away from the printing frame.

[0013] Compared with the prior art, the beneficial effects of the present invention by adopting the above technical solution are as follows: 1. This invention sets two independent output channels, an inner shaft output hole and an annular output groove, at the lower end of the printing spindle. The inner shaft output hole is used to output high-toughness material as the inner core skeleton, and the annular output groove is used to output high-hardness material as the outer shell layer. This enables the printed parts to form a core-shell gradient distribution structure, realizing a functional gradient design of high-hardness and wear-resistant outer layer and high-toughness inner layer, which significantly improves the comprehensive mechanical properties of the printed parts. 2. This invention achieves graded adjustable printing radius through the coordinated operation of the output hole control frame, telescopic control plate, arc-shaped control frame and arc-shaped inner frame, which can adapt to the printing needs of different cross-sectional sizes without replacing the print head, thus improving printing efficiency and flexibility; 3. This invention achieves the switching between sequential printing mode and synchronous printing mode through the alignment and misalignment mechanism of the side wall receiving hole and the outer wall feeding hole of the lifting bearing pipe and the feeding pipe, thus enriching the applicable scope of the printing process. 4. This invention achieves precise adjustment of the printing radius through a transmission mechanism consisting of a control ring, connecting block, inner ring, moving rotating shaft, and fixed rotating shaft. The adjustment position is locked through the cooperation of lifting block and limiting groove. The operation is convenient and reliable. By setting up a gas absorption system consisting of an extension rod, absorption hood, and air pump, irritating gases and dust can be extracted in time during the printing process, protecting the health of operators, improving the printing environment, and enhancing printing quality.

[0014] Other advantages, objectives and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be learned from the practice of the invention. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of the device in an embodiment of the present invention; Figure 2 This is a three-dimensional schematic diagram of the printing rack in an embodiment of the present invention; Figure 3 This is a three-dimensional schematic diagram of the printing spindle in an embodiment of the present invention; Figure 4 This is a three-dimensional schematic diagram of the material conveying pipe in an embodiment of the present invention; Figure 5 This is a three-dimensional schematic diagram of the annular output slot in an embodiment of the present invention; Figure 6 This is a three-dimensional schematic diagram of the inner shaft printhead in an embodiment of the present invention; Figure 7 This is a three-dimensional schematic diagram of the lifting bearing pipe in an embodiment of the present invention; Figure 8 This is a three-dimensional schematic diagram of the material conveying hole on the outer wall in an embodiment of the present invention; Figure 9 This is a three-dimensional schematic diagram of the externally controlled annular groove in an embodiment of the present invention; Figure 10 This is a three-dimensional schematic diagram of the lifting block in an embodiment of the present invention; Figure 11 This is a three-dimensional schematic diagram of the arc-shaped control frame in an embodiment of the present invention; Figure 12 This is a three-dimensional schematic diagram of the control loop in an embodiment of the present invention.

[0016] In the diagram: 1. Main body of the molding device; 2. Printing frame; 3. Feeding pipe; 4. Control ring; 5. Moving and rotating shaft; 6. Fixed outer shell; 7. Outer extension rod; 21. Printing spindle; 22. Telescopic groove; 23. Inner shaft print head; 24. Inner shaft output hole; 25. Annular output groove; 26. Output hole control frame; 27. Arc-shaped control frame; 28. Arc-shaped inner frame; 29. ​​Telescopic control plate; 31. Lifting bearing pipe; 32. Return spring; 33. Side 34. Outer wall receiving hole; 41. Connecting block; 42. Inner ring; 43. Outer control annular groove; 51. Fixed rotating shaft; 52. Connecting hole; 61. Inner chamber; 62. Lifting block; 63. Limiting groove; 64. Lifting spring; 65. Rotating rod; 66. Height limiting frame; 67. Angle limiting shaft; 68. Lifting control ring; 71. Translation slide; 72. Threaded rod; 73. Connecting rod; 74. Absorption cover; 75. Air pump. Detailed Implementation

[0017] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. It should be noted that the description of these embodiments is for the purpose of helping to understand the present invention, but does not constitute a limitation of the present invention.

[0018] Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0019] Please see the appendix Figure 1 - Appendix Figure 12 This invention relates to a 3D printing molding device for skeleton-reinforced metal materials.

[0020] In one specific embodiment, the molding device body 1 is the frame body of the device, which is used to provide structural support and installation foundation. The molding device body 1 is internally connected to a printing frame 2. The printing frame 2 can move inside the molding device body 1 to adjust the printing position. The lower end of the printing frame 2 is connected to a printing spindle 21, which is the core printing execution component of the device. Its lower end is provided with a dual-channel material output structure.

[0021] Furthermore, the dual-channel output structure is as follows: A telescopic groove 22 is provided in the middle of the lower end of the printing spindle 21. The telescopic groove 22 is a groove structure that extends along the axis of the printing spindle 21. An inner shaft print head 23 is slidably connected inside the telescopic groove 22. The inner shaft print head 23 can slide up and down along the axis within the telescopic groove 22. An inner shaft output hole 24 is provided at the lower end of the inner shaft print head 23. The inner shaft output hole 24 is used to output high-toughness printing material as the inner core skeleton of the printed part. The lower end of the printing spindle 21 is also provided with an annular output groove 25. The annular output groove 25 is arranged around the telescopic groove 22 to form a concentric annular structure centered on the telescopic groove 22. The annular output groove 25 is used to output high-hardness printing material as the outer shell layer of the printed part. The inner shaft output hole 24 and the annular output groove 25 together form a dual-channel material output structure, so that the printed part forms a core-shell gradient distribution structure, realizing a gradient functional design with high hardness and wear resistance in the outer layer and high toughness in the inner layer.

[0022] Furthermore, the inner shaft printhead 23 and the feeding system are specifically as follows: The upper end of the inner shaft printhead 23 is connected to the top wall of the telescopic groove 22 via a return spring 32. The return spring 32 provides elastic buffer when the inner shaft printhead 23 is squeezed in the opposite direction by the printing platform, and drives the inner shaft printhead 23 to reset after the squeezing force disappears. The upper middle of the inner shaft printhead 23 is connected to a lifting support tube 31. The lifting support tube 31 is a tubular structure. The upper end of the lifting support tube 31 is provided with a lifting connection hole with a blind hole structure, that is, the lifting connection hole is a blind hole structure and its bottom is closed. The inner wall of the lifting connection hole is provided with a side wall receiving hole 33. The side wall receiving hole 33 is a through hole that penetrates the side wall of the lifting support tube 31. The lower end of the lifting support tube 31 is provided with a pipe hole, which is connected to the side wall receiving hole 33 to form a material conveying channel from the side wall of the lifting support tube 31 to the lower end. The inner wall of the lifting connection hole is slidably connected to a feeding pipe 3, which is used to transport high-toughness printing material. The top end of the feeding pipe 3 is provided with a feeding groove for receiving printing material from an external material supply system. The lower end of the side wall of the feeding pipe 3 is provided with an outer wall feeding hole 34, which is used to communicate and cooperate with the side wall receiving hole 33. The feeding groove communicates with the outer wall feeding hole 34 to form a material transport path from the top end of the feeding pipe 3 to the outer wall feeding hole 34. When the inner shaft print head 23 is squeezed and moves upward during the printing process, the lifting support tube 31 connected to the inner shaft print head 23 moves upward synchronously, causing the side wall receiving hole 33 and the outer wall feeding hole 34 to be relatively misaligned. In the initial state, the side wall receiving hole 33 and the outer wall feeding hole 34 are aligned and connected. High toughness material can reach the inner shaft output hole 24 for output through the feeding tube 3, the outer wall feeding hole 34, the side wall receiving hole 33, and the tube hole. When the lifting support tube 31 moves upward, the side wall receiving hole 33 and the outer wall feeding hole 34 are misaligned, and the material supply of the inner shaft output hole 24 is cut off. Since the material supply of the annular output groove 25 is not affected by the displacement of the inner shaft print head 23, the sequential printing mode of printing the outer shell first and then the inner core into the shell can be realized through the annular output groove 25; Furthermore, the size of the outer wall feeding hole 34 can extend upward along the axial direction of the feeding pipe 3, and an arc-shaped sealing plate is added to the outer wall of the feeding pipe 3. The arc-shaped sealing plate can cover part of the height area of ​​the outer wall feeding hole 34, thereby controlling the effective height of the outer wall feeding hole 34. An electric telescopic rod is installed at the upper end of the feeding pipe 3. The position of the arc-shaped sealing plate is controlled by the electric telescopic rod to realize the switching between sequential printing mode and synchronous printing mode. In synchronous printing mode, the electric telescopic rod is activated to control the arc-shaped sealing plate to move upward, thereby expanding the effective height of the outer wall feeding hole 34. When the lifting bearing pipe 31 moves upward, the side wall receiving hole 33 remains connected to the outer wall feeding hole 34. The inner shaft print head 23 and the inner shaft output hole 24 can feed materials synchronously during printing, thereby realizing the synchronous printing mode.

[0023] Furthermore, the output radius adjustment mechanism is specifically as follows: The lower end of the inner shaft printhead 23 is connected to an output hole control frame 26. The output hole control frame 26 is used to control the effective output radius of the inner shaft output hole 24. A telescopic control plate 29 is connected to the side of the output hole control frame 26 near the center of the inner shaft output hole 24. A telescopic hole is opened on the side of the output hole control frame 26 near the telescopic control plate 29. The side of the telescopic control plate 29 near the output hole control frame 26 extends into the interior of the telescopic hole. The telescopic control plate 29 can slide and extend in the telescopic hole. When the telescopic control plate 29 extends out of the telescopic hole, the telescopic control plate 29 extends towards the center of the inner shaft output hole 24, reducing the effective output radius of the inner shaft output hole 24. Four arc-shaped control frames 27 are connected to one side of the output hole control frame 26. The four arc-shaped control frames 27 are distributed along the side of the output hole control frame 26. Arc-shaped telescopic holes are opened on the side of the four arc-shaped control frames 27 away from the output hole control frame 26. Arc-shaped inner frames 28 are slidably connected to the inner walls of the four arc-shaped telescopic holes. The lengths of the four arc-shaped inner frames 28 are different and are arranged in order from longest to shortest. The four arc-shaped inner frames 28 are connected to the inner wall of the arc-shaped telescopic hole near the output hole control frame 26 by springs. The springs provide outward elastic restoring force for the arc-shaped inner frames 28. When adjusting the printing radius, the arc-shaped control frame 27 and the arc-shaped inner frame 28 contact the adjacent output hole control frame 26 and telescopic control plate 29 sequentially from the outside to the inside. Since the four arc-shaped inner frames 28 have different lengths, when the output hole control frame 26 moves outward, the longer arc-shaped inner frame 28 contacts the adjacent structure first and is compressed by the spring, blocking the flow path of the printing material, thereby reducing the printing radius. After the printing material is output through the inner shaft output hole 24, it enters the corresponding area through the arc-shaped inner frame 28 that has not contacted the adjacent telescopic control plate 29. After contacting the arc-shaped inner frame 28 that is in contact with the adjacent telescopic control plate 29, it is blocked, thereby achieving precise control of the printing radius.

[0024] Furthermore, the control ring 4 transmission mechanism is specifically as follows: A control ring 4 is rotatably connected to the outer wall of the inner shaft printhead 23. The control ring 4 is an annular structure and is sleeved on the outer wall of the inner shaft printhead 23. It can rotate relative to the inner shaft printhead 23. An outer control annular groove 43 is opened at the lower end of the inner shaft printhead 23. An inner ring 42 is rotatably connected inside the outer control annular groove 43. The outer wall of the inner ring 42 is connected to the inner wall of the control ring 4 through a connecting block 41, so that the rotational movement of the control ring 4 is transmitted to the inner ring 42 through the connecting block 41. The upper end of the output hole control frame 26 is provided with a connection hole 52, and a movable rotating shaft 5 is rotatably connected inside the connection hole 52. The upper end of the movable rotating shaft 5 is connected to the lower end of the inner ring 42. The upper end of the telescopic control plate 29 is provided with a through hole, and a fixed rotating shaft 51 is rotatably connected inside the through hole. The upper end of the fixed rotating shaft 51 is rotatably connected to the lower end of the inner shaft print head 23. The working process of the above transmission mechanism is as follows: When the printing radius needs to be adjusted, the control ring 4 is rotated. The rotation of the control ring 4 drives the inner ring 42 to rotate synchronously through the connecting block 41. The rotation of the inner ring 42 drives the movable rotating shaft 5 to make a circular motion around the center of the inner ring 42. The movable rotating shaft 5 drives the output hole control frame 26 to make a radial displacement through the connecting hole 52. Since the upper end of the fixed rotating shaft 51 is fixedly rotatably connected to the lower end of the inner shaft print head 23, the position of the telescopic control plate 29 remains stable relative to the inner shaft print head 23. Therefore, when the output hole control frame 26 makes a radial displacement, the telescopic control plate 29 extends out from the telescopic hole of the output hole control frame 26, changing the effective output radius of the inner shaft output hole 24.

[0025] Furthermore, the specific institutions targeted are: The outer wall of the inner shaft printhead 23 is connected to a fixed outer shell 6. The lower end of the fixed outer shell 6 is provided with an inner chamber 61. A lifting block 62 is slidably connected inside the inner chamber 61. The upper end of the lifting block 62 is connected to the top wall of the inner chamber 61 through a lifting spring 64. The lifting spring 64 provides downward elastic pressure to the lifting block 62, so that the lifting block 62 is held at the lower end of the inner chamber 61 in a natural state. A limiting groove 63 is provided at the upper end of the control ring 4. The limiting groove 63 is a groove structure distributed around the circumference of the control ring 4. When the control ring 4 rotates to the designated position, the lifting block 62 falls into the interior of the limiting groove 63 under the action of the lifting spring 64, locking the position of the control ring 4 and preventing the control ring 4 from rotating in the opposite direction. The four lifting blocks 62 cooperate with the four arc-shaped inner frames 28. When only three lifting blocks 62 fall into the interior of the limiting groove 63, the arc-shaped inner frame 28 away from the inner shaft output hole 24 contacts the adjacent output hole control frame 26, thereby reducing the printing radius. The outer wall of the lifting block 62 is connected to a linkage control rod, and the upper end of the linkage control rod is connected to a lifting control ring 68. When the control ring 4 needs to be rotated in the opposite direction, the lifting control ring 68 is pushed to move upward. The lifting control ring 68 drives the linkage control rod and the lifting block 62 to move upward, so that the lifting block 62 is taken out from the inside of the limit groove 63, and the reverse rotation limitation on the control ring 4 is disconnected. A rotating rod 65 is rotatably connected to the outer wall of the inner shaft printhead 23. A height limiting frame 66 is connected to the outer wall of the rotating rod 65. The height limiting frame 66 is used to limit the height position of the lifting control ring 68. An angle limiting shaft 67 is connected to the outer wall of the inner shaft printhead 23. The angle limiting shaft 67 is used to limit the angle position of the height limiting frame 66. Through the coordinated operation of the rotating rod 65, the height limiting frame 66 and the angle limiting shaft 67, the height and angle of the lifting control ring 68 are precisely limited.

[0026] Furthermore, the gas absorption system specifically includes: The lower end of the print frame 2 is connected to an extension rod 7, which extends to the side of the print spindle 21. The front end of the extension rod 7 is provided with a translational slide groove 71. A threaded rod 72 is rotatably connected to the inner wall of the translational slide groove 71 near the print frame 2. A connecting rod 73 is spirally connected to the outer wall of the threaded rod 72. The outer wall of the connecting rod 73 is slidably connected to the inner wall of the translational slide groove 71, so that the connecting rod 73 moves linearly along the translational slide groove 71 when the threaded rod 72 rotates. The lower end of the connecting rod 73 is connected to an absorption cover 74. The absorption cover 74 is a cover structure used to collect irritating gases and dust generated during the printing process. A vacuum pump 75 is connected to the side of the absorption cover 74 away from the print frame 2. The vacuum pump 75 provides negative pressure suction power for the absorption cover 74. During the printing process, the vacuum pump 75 is started. The vacuum pump 75 extracts and collects the irritating gas generated during the printing process through the absorption hood 74. When it is necessary to adjust the distance between the absorption hood 74 and the printing spindle 21, the threaded rod 72 is rotated. The rotation of the threaded rod 72 drives the connecting rod 73 to move along the translation slide 71, thereby moving the absorption hood 74 to a suitable position to ensure the gas collection effect.

[0027] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on.

[0028] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0029] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments.

[0030] For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and these variations still fall within the protection scope of the present invention.

Claims

1. A 3D printing molding device for skeleton-reinforced metal materials, comprising a molding device body (1), characterized in that: The molding device body (1) is internally connected to a printing frame (2). The lower end of the printing frame (2) is connected to a printing spindle (21). A telescopic groove (22) is provided in the middle of the lower end of the printing spindle (21). An inner shaft print head (23) is slidably connected inside the telescopic groove (22). An inner shaft output hole (24) is provided at the lower end of the inner shaft print head (23). An annular output groove (25) is provided at the lower end of the printing spindle (21), and the annular output groove (25) surrounds the telescopic groove (22). An output hole control frame (26) is connected to the lower end of the inner shaft print head (23). A telescopic control plate (29) is connected to the side near the center of the inner shaft output hole (24), and an arc-shaped control frame (27) is connected to the side of the output hole control frame (26). A control ring (4) is rotatably connected to the outer wall of the inner shaft print head (23). The control ring (4) is connected to the output hole control frame (26) through a connecting mechanism, driving the telescopic control plate (29) and the arc-shaped control frame (27) to move in coordination to adjust the output radius. A telescopic hole is opened on the side of the output hole control frame (26) near the telescopic control plate (29), and the side of the telescopic control plate (29) near the output hole control frame (26) extends into the interior of the telescopic hole.

2. The 3D printing molding device for skeleton-reinforced metal materials according to claim 1, characterized in that: Four arc-shaped control frames (27) are connected to one side of the output hole control frame (26). Each of the four arc-shaped control frames (27) has an arc-shaped telescopic hole on the side away from the output hole control frame (26). An arc-shaped inner frame (28) is slidably connected to the inner wall of each of the four arc-shaped telescopic holes. The lengths of the four arc-shaped inner frames (28) are different, and they are arranged in order of different lengths. Each of the four arc-shaped inner frames (28) is connected to the inner wall of the arc-shaped telescopic hole near the output hole control frame (26) by a spring.

3. The 3D printing molding device for skeleton-reinforced metal materials according to claim 1, characterized in that: The upper end of the inner shaft print head (23) is connected to the top wall of the telescopic groove (22) through a return spring (32). The upper end of the inner shaft print head (23) is connected to a lifting support tube (31), and the upper end of the lifting support tube (31) is provided with a lifting connection hole in the form of a blind hole. The inner wall of the lifting connection hole is provided with a side wall receiving hole (33), and the lower end of the lifting support tube (31) is provided with a pipe hole, and the pipe hole is connected to the side wall receiving hole (33).

4. The 3D printing molding device for skeleton-reinforced metal materials according to claim 3, characterized in that: The inner wall of the lifting connection hole is slidably connected to a conveying pipe (3) for conveying metal materials. The top end of the conveying pipe (3) is provided with a conveying groove. The lower end of the side wall of the conveying pipe (3) is provided with an outer wall conveying hole (34) for communicating and cooperating with the side wall receiving hole (33). The conveying groove is connected to the outer wall conveying hole (34).

5. The 3D printing molding device for skeleton-reinforced metal materials according to claim 1, characterized in that: The outer wall of the inner shaft printhead (23) is rotatably connected to a control ring (4) for controlling the position of the output hole control frame (26). The lower end of the inner shaft printhead (23) is provided with an outer control annular groove (43). The inner ring (42) is rotatably connected to the inner ring (43), and the outer wall of the inner ring (42) is connected to the inner wall of the control ring (4) through a connecting block (41). The upper end of the output hole control frame (26) is provided with a connecting hole (52). The inner wall of the connecting hole (52) is rotatably connected to a movable rotating shaft (5), and the upper end of the movable rotating shaft (5) is connected to the lower end of the inner ring (42). The upper end of the telescopic control plate (29) is provided with a through hole, and the inner wall of the through hole is rotatably connected to a fixed rotating shaft (51), and the upper end of the fixed rotating shaft (51) is rotatably connected to the lower end of the inner shaft printhead (23).

6. The 3D printing molding device for skeleton-reinforced metal materials according to claim 1, characterized in that: The outer wall of the inner shaft print head (23) is connected to a fixed outer shell (6). The lower end of the fixed outer shell (6) is provided with an inner chamber (61). The inner chamber (61) is slidably connected to a lifting block (62) for limiting the position of the control ring (4). The upper end of the lifting block (62) is connected to the top wall of the inner chamber (61) through a lifting spring (64).

7. The 3D printing molding device for skeleton-reinforced metal materials according to claim 6, characterized in that: The upper end of the control ring (4) is provided with a limiting groove (63) for cooperating with the lifting block (62). The outer wall of the lifting block (62) is connected to a linkage control rod, and the upper end of the linkage control rod is connected to a lifting control ring (68). The outer wall of the inner shaft print head (23) is rotatably connected to a rotating rod (65). The outer wall of the rotating rod (65) is actively connected to a height limiting frame (66) for limiting the height position of the lifting control ring (68). The outer wall of the inner shaft print head (23) is connected to an angle limiting shaft (67) for limiting the angle position of the height limiting frame (66).

8. The 3D printing molding device for skeleton-reinforced metal materials according to claim 1, characterized in that: The lower end of the printing frame (2) is connected to an extension rod (7), and the front end of the extension rod (7) is provided with a translational slide groove (71). The inner wall of the translational slide groove (71) near the printing frame (2) is rotatably connected to a threaded rod (72).

9. The 3D printing molding device for skeleton-reinforced metal materials according to claim 8, characterized in that: The outer wall of the threaded rod (72) is spirally connected to a connecting rod (73), and the outer wall of the connecting rod (73) is slidably connected to the inner wall of the translational slide (71). The lower end of the connecting rod (73) is connected to an absorption hood (74) for absorbing printing gas. The side of the absorption hood (74) away from the printing frame (2) is connected to a vacuum pump (75).

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