A degree of freedom printing base for 3D printing equipment

Abstract

The present invention discloses a free-degree printing base of a 3D printing device, including a printing base, the two ends of the printing base are respectively connected to two synchronous driving devices, the driving device includes a rotating driving mechanism and a lifting driving mechanism; the printing base includes a base connecting portion and a base body; the rotating driving mechanism includes a base plate, the top four corners of the base plate are fixed with supporting legs, a supporting plate is arranged above the base plate, the tops of the supporting legs are fixedly connected to the bottom of the supporting plate, the top of the base plate is rotatably connected with a rotating rod through a bearing, the top of the rotating rod passes through the top of the supporting plate and is fixed with a first disc. The driving device of the present invention has a simple structure and is easy to use. It well meets the requirements of processing symmetry of some rotating parts (axial symmetry), etc., and can not only move up and down, but also rotate; and can complete the printing of multiple parts on a single printing base, with high work efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of SLM equipment, and in particular to a free-degree-of-freedom printing base for 3D printing equipment. Background Art

[0002] Selective laser melting (SLM) metal 3D printing technology uses a precise focused spot to quickly melt the pre-laid layers of metal powder, and can directly obtain functional parts of almost any shape and complete metallurgical bonding. The density can reach nearly 100%, which is a rapid prototyping technology with great development prospects, especially in the fields of aerospace, medical, automobile, mold, etc.

[0003] Chinese invention patent number CN201720583224.9 provides a quick leveling device for the base of an SLM device, whose base shaft can move up and down, but its processing technology adopts top-down, layer-by-layer printing, but most rotating parts currently manufactured by SLM grow along the axial direction, which is limited by the diameter size. What is more disadvantageous is that the geometric changes of these parts in the axial direction add a lot of support requirements. From the working state of the rotating part and the load condition of the structure, it is necessary to meet the requirements of axial symmetry in the radial equal diameter, including the manufacturing process.

[0004] For rotating machinery such as aircraft engines, many key parts are axisymmetric, especially impeller machinery. Most rotating parts currently manufactured by SLM grow along the axial direction, which is limited by the diameter size. What is more disadvantageous is that the geometric changes of these parts in the axial direction add a lot of support requirements. From the working state of the rotating parts and the load conditions of the structure, they need to meet the characteristics of axisymmetry and meet the requirements of axisymmetry in the radial equal diameter, including manufacturing process.

[0005] However, the current 3D printing equipment's free-form printing base still has the following problems:

[0006] 1. The printing base can generally only move up and down and print layer by layer. It is difficult to meet the requirements of axial symmetry when processing some rotating parts, resulting in unqualified processed products;

[0007] 2. It is impossible to print multiple parts on a single printing base, and the work efficiency is low;

[0008] 3. There is a lack of a driving device suitable for a free-form printing base. The existing driving device is only suitable for a platform-type printing base and cannot meet the printing requirements of some long strip (or elongated) printing bases.

[0009] Based on the above situation, the present invention proposes a free-degree-of-freedom printing base for a 3D printing device, which can effectively solve the above problems. Summary of the invention

[0010] The purpose of the present invention is to provide a degree of freedom printing base for a 3D printing device. The degree of freedom printing base for the 3D printing device of the present invention has a simple structure and is easy to use. Based on the existing mature SLM principle, a long strip (or long base axis) printing base is adopted. The workpiece is formed from the inside to the outside, and each layer is on the same radius. The laser scanning is only selectively performed in the axial direction. When the workpiece is at the same radius, it prints a line and then rotates an angle corresponding to the width of the line. After completing the full circle printing of the same radius, it sinks a slice thickness, and continues to repeat the above process to complete the manufacture of the entire workpiece; and multiple parts can be printed on a single printing base, so that coaxial parts can be integrated; multiple lasers can also control multiple areas to work together / partially (or even separately) to improve work efficiency.

[0011] The driving device adopts a clever combination of a rotary driving mechanism and a lifting driving mechanism. It can not only move up and down, but also rotate, which well meets the requirements of processing symmetry of some rotating parts and ensures the quality of processed products. It is also suitable for the printing needs of long strip (or long) printing bases.

[0012] The rotary drive mechanism of the present invention can fix the long strip (or long shape) printing base on the second disc more conveniently and quickly by arranging a support plate, a bidirectional screw rod, a knob, a cross bar, a vertical plate, a connecting rod and an arc plate. By arranging a support plate, a rotating rod, a first disc, a driven gear, a servo motor, a driving gear and a column, the second disc can be driven to rotate, thereby realizing the rotation of the printing base, which well meets the requirements of processing symmetry of some rotating parts and ensures the quality of the processed products; and is suitable for the printing needs of the long strip (or long shape) printing base.

[0013] The present invention is achieved through the following technical solutions:

[0014] A free-degree printing base of a 3D printing device, comprising a printing base, wherein two ends of the printing base are respectively connected to two synchronously working driving devices, and the driving devices include a rotating driving mechanism and a lifting driving mechanism;

[0015] The printing base comprises a base connection part and a base body; the base connection part plays a connecting and fixing role; the base body extends in a long strip shape, and the circumferential surface in the extending direction is the printing support surface;

[0016] The rotation driving mechanism is connected to the base connecting portion and is used to drive the printing base to rotate;

[0017] The upper part of the lifting drive mechanism is connected to the rotating drive mechanism, and the lifting direction of the lifting drive mechanism is perpendicular to the axial direction of the rotating rod of the rotating drive mechanism;

[0018] The rotary drive mechanism includes a base plate, support legs are fixed to the four corners of the top of the base plate, a support plate is arranged above the base plate, the tops of the support legs are fixedly connected to the bottom of the support plate, the top of the base plate is rotatably connected to a rotating rod through a bearing, the top of the rotating rod passes through the top of the support plate and is fixed with a first disc, the top of the rotating rod is rotatably connected to the support plate through a bearing, a driven gear is fixedly sleeved on the surface of the rotating rod, a servo motor is fixed to the top of the base plate, a driving gear is fixed to the output shaft of the servo motor, the driving gear is meshed with the driven gear, four columns are symmetrically fixed to the top of the first disc, a second disc is arranged above the first disc, and the tops of the columns are connected to the second disc The bottom of the two-way screw rod is fixedly connected, and a bracket plate is symmetrically fixed on the top of the first disc. A two-way screw rod is arranged above the first disc, and two ends of the two-way screw rod are rotatably connected to one side wall of an adjacent bracket plate through bearings. One end of the two-way screw rod passes through one side wall of an adjacent bracket plate and is fixed with a knob. A cross bar is arranged below the two-way screw rod, and two ends of the cross bar are fixedly connected to one side wall of an adjacent bracket plate. The outer walls at both ends of the two-way screw rod are connected with vertical plates by threads, and the vertical plates are slidably connected to the surface of the cross bar. A strip through hole is opened on the top of the second disc, and the top ends of the vertical plates pass through the strip through hole, a connecting rod is fixed to one side wall of the vertical plate, and an arc plate is fixed to one end of the connecting rod.

[0019] The 3D printing device of the present invention has a simple structure and is easy to use. Based on the existing mature SLM principle, a long strip (or long base axis) printing base is adopted. The workpiece is formed from the inside to the outside, and each layer is on the same radius. The laser scanning is only selectively performed in the axial direction. When the workpiece is at the same radius, a line is printed and then the workpiece is rotated by an angle corresponding to the width of the line. After completing the full circle printing of the same radius, it sinks a slice thickness, and the above process is repeated to complete the manufacture of the entire workpiece; and multiple parts can be printed on a single printing base, so that coaxial parts can be integrated; multiple lasers can also control multiple areas to work together / partially (or even separately) to improve work efficiency.

[0020] The rotary drive mechanism of the present invention can fix the long strip (or long shape) printing base on the second disc more conveniently and quickly by arranging a support plate, a bidirectional screw rod, a knob, a cross bar, a vertical plate, a connecting rod and an arc plate. By arranging a support plate, a rotating rod, a first disc, a driven gear, a servo motor, a driving gear and a column, the second disc can be driven to rotate, thereby realizing the rotation of the printing base, which well meets the requirements of processing symmetry of some rotating parts and ensures the quality of the processed products; and is suitable for the printing needs of the long strip (or long shape) printing base.

[0021] Preferably, the lifting drive mechanism comprises an L-shaped fixing plate, a hydraulic rod and a hydraulic cylinder which are arranged in sequence from top to bottom;

[0022] The horizontal portion of the L-shaped fixing plate is connected to the upper end of the hydraulic rod, the vertical portion is connected to the bottom plate of the rotary drive mechanism, and the extending direction of the arc plate is perpendicular to the extending direction of the hydraulic rod.

[0023] The 3D printing device of the present invention has a simple structure and is easy to use. The driving device adopts a clever combination of a rotating driving mechanism and a lifting driving mechanism. It can not only move up and down, but also rotate, which well meets the requirements of processing symmetry of some rotating parts and ensures the quality of processed products; and is suitable for the printing needs of long strip (or long) printing bases.

[0024] Preferably, the base body extends in a long strip shape, and the cross section (contour) at any position in the extending direction is circular.

[0025] Preferably, the base body extends in a cylindrical shape.

[0026] Preferably, the base connection portion is in the shape of a cylinder.

[0027] Preferably, four sliding blocks are symmetrically fixed to the bottom of the first disc, an annular sliding groove is provided on the top of the support plate, and the four sliding blocks are slidably connected in the annular sliding groove.

[0028] Preferably, the threads at both ends of the bidirectional screw rod have opposite directions, and one side wall of the two vertical plates is respectively provided with threaded holes corresponding to the threads at both ends of the bidirectional screw rod, and the two ends of the bidirectional screw rod are respectively threadedly connected with the threaded holes of the corresponding vertical plates, and one side wall of the vertical plates is provided with sliding holes, and the cross bar passes through the sliding holes.

[0029] Preferably, the surface of the knob is provided with anti-slip grooves.

[0030] Preferably, the surfaces of the arc-shaped plates away from the connecting rods are fixed with anti-slip rubber pads.

[0031] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0032] The 3D printing device of the present invention has a simple structure and is easy to use. Based on the existing mature SLM principle, a long strip (or long base axis) printing base is adopted. The workpiece is formed from the inside to the outside, and each layer is on the same radius. The laser scanning is only selectively performed in the axial direction. When the workpiece is at the same radius, a line is printed and then the workpiece is rotated by an angle corresponding to the width of the line. After completing the full circle printing of the same radius, it sinks a slice thickness, and the above process is repeated to complete the manufacture of the entire workpiece; and multiple parts can be printed on a single printing base, so that coaxial parts can be integrated; multiple lasers can also control multiple areas to work together / partially (or even separately) to improve work efficiency.

[0033] The driving device adopts an ingenious combination of a rotating driving mechanism and a lifting driving mechanism. It can not only move up and down, but also rotate, which well meets the requirements of processing symmetry of some rotating parts and ensures the quality of processed products. It is suitable for the printing needs of long strip (or long) printing bases, and the driving of the printing base can achieve synchronization at both ends, which makes the supporting effect of the printing base more stable and the working process more stable.

[0034] The rotary drive mechanism of the present invention can fix the long strip (or long shape) printing base on the second disc more conveniently and quickly by arranging a support plate, a bidirectional screw rod, a knob, a cross bar, a vertical plate, a connecting rod and an arc plate. By arranging a support plate, a rotating rod, a first disc, a driven gear, a servo motor, a driving gear and a column, the second disc can be driven to rotate, thereby realizing the rotation of the printing base, which well meets the requirements of processing symmetry of some rotating parts and ensures the quality of the processed products; and is suitable for the printing needs of the long strip (or long shape) printing base. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of the present invention;

[0036] Figure 2 It is a schematic diagram of the overall structure of the rotary drive mechanism of the present invention;

[0037] Figure 3 This is a schematic diagram of the top view of the support plate of the present invention;

[0038] Figure 4 This is a schematic diagram of the structure of the first disc of the present invention when viewed from above;

[0039] Figure 5 It is a schematic diagram of the side structure of the vertical plate of the present invention.

[0040] Figure 6It is a structural schematic diagram of the lifting drive mechanism of the present invention;

[0041] Figure 7 It is a structural schematic diagram of the rotary drive mechanism and the lifting drive mechanism of the present invention;

[0042] In the figure: 100, rotating drive mechanism; 200, lifting drive mechanism; 2, printing base; 201, base connection part; 202, and base body; 2021, printing support surface; 5, workpiece;

[0043] 11. Bottom plate; 12. Support legs; 13. Support plate; 14. Rotating rod; 15. First disc; 16. Driven gear; 17. Servo motor; 18. Driving gear; 19. Column; 110. Second disc; 111. Bracket plate; 112. Bidirectional screw rod; 113. Knob; 114. Crossbar; 115. Vertical plate; 116. Strip opening; 117. Connecting rod; 118. Arc plate; 119. Sliding block; 120. Annular slide groove; 121. Threaded hole; 122. Sliding hole; 123. Anti-skid rubber pad;

[0044] 211, L-shaped fixing plate; 210, hydraulic rod; 29, hydraulic cylinder; 2111, horizontal part; 2112, vertical part. DETAILED DESCRIPTION

[0045] In order to enable those skilled in the art to better understand the technical solution of the present invention, the preferred implementation scheme of the present invention is described below in conjunction with specific embodiments. However, it should be understood that the drawings are only used for exemplary description and cannot be understood as a limitation on this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The positional relationship described in the drawings is only for exemplary description and cannot be understood as a limitation on this patent.

[0046] Embodiment 1:

[0047] like Figures 1 to 7 As shown, a 3D printing device has a degree of freedom printing base, including a printing base, wherein two ends of the printing base are respectively connected to two synchronously working driving devices, and the driving devices include a rotating driving mechanism and a lifting driving mechanism;

[0048] The printing base comprises a base connection part and a base body; the base connection part plays a connecting and fixing role; the base body extends in a long strip shape, and the circumferential surface in the extending direction is the printing support surface;

[0049] The rotation driving mechanism is connected to the base connecting portion and is used to drive the printing base to rotate;

[0050] The upper part of the lifting drive mechanism is connected to the rotating drive mechanism, and the lifting direction of the lifting drive mechanism is perpendicular to the axial direction of the rotating rod of the rotating drive mechanism;

[0051] The rotary drive mechanism includes a base plate, support legs are fixed to the four corners of the top of the base plate, a support plate is arranged above the base plate, the tops of the support legs are fixedly connected to the bottom of the support plate, the top of the base plate is rotatably connected to a rotating rod through a bearing, the top of the rotating rod passes through the top of the support plate and is fixed with a first disc, the top of the rotating rod is rotatably connected to the support plate through a bearing, a driven gear is fixedly sleeved on the surface of the rotating rod, a servo motor is fixed to the top of the base plate, a driving gear is fixed to the output shaft of the servo motor, the driving gear is meshed with the driven gear, four columns are symmetrically fixed to the top of the first disc, a second disc is arranged above the first disc, and the tops of the columns are connected to the second disc The bottom of the two-way screw rod is fixedly connected, and a bracket plate is symmetrically fixed on the top of the first disc. A two-way screw rod is arranged above the first disc, and two ends of the two-way screw rod are rotatably connected to one side wall of an adjacent bracket plate through bearings. One end of the two-way screw rod passes through one side wall of an adjacent bracket plate and is fixed with a knob. A cross bar is arranged below the two-way screw rod, and two ends of the cross bar are fixedly connected to one side wall of an adjacent bracket plate. The outer walls at both ends of the two-way screw rod are connected with vertical plates by threads, and the vertical plates are slidably connected to the surface of the cross bar. A strip through hole is opened on the top of the second disc, and the top ends of the vertical plates pass through the strip through hole, a connecting rod is fixed to one side wall of the vertical plate, and an arc plate is fixed to one end of the connecting rod.

[0052] Embodiment 2:

[0053] like Figures 1 to 7 As shown, a 3D printing device has a degree of freedom printing base, including a printing base, wherein two ends of the printing base are respectively connected to two synchronously working driving devices, and the driving devices include a rotating driving mechanism and a lifting driving mechanism;

[0054] In this way, the driving of the printing base can be synchronized at both ends, the supporting effect of the printing base is more stable, and the working process is more stable.

[0055] In addition, multiple parts can be printed on a single printing base, so that coaxial parts can be integrated; multiple lasers can also control multiple areas to work together / partially (or even separately) to improve work efficiency.

[0056] The printing base comprises a base connection part and a base body; the base connection part plays a connecting and fixing role; the base body extends in a long strip shape, and the circumferential surface in the extending direction is the printing support surface;

[0057] The rotation driving mechanism is connected to the base connecting portion and is used to drive the printing base to rotate;

[0058] The upper part of the lifting drive mechanism is connected to the rotating drive mechanism, and the lifting direction of the lifting drive mechanism is perpendicular to the axial direction of the rotating rod of the rotating drive mechanism;

[0059] The rotary drive mechanism, see Figures 2 to 5 , including a bottom plate, support legs are fixed at the four corners of the top of the bottom plate, a support plate is arranged above the bottom plate, the tops of the support legs are fixedly connected to the bottom of the support plate, the top of the bottom plate is rotatably connected to a rotating rod through a bearing, the top of the rotating rod passes through the top of the support plate and is fixed with a first disc, the top of the rotating rod is rotatably connected to the support plate through a bearing, a driven gear is fixed on the surface of the rotating rod, a servo motor is fixed on the top of the bottom plate, a driving gear is fixed on the output shaft of the servo motor, the driving gear is meshed with the driven gear, four columns are symmetrically fixed on the top of the first disc, a second disc is arranged above the first disc, and the tops of the columns are fixedly connected to the bottom of the second disc A fixed connection is provided, a bracket plate is symmetrically fixed on the top of the first disc, a bidirectional screw rod is arranged above the first disc, both ends of the bidirectional screw rod are rotatably connected with one side wall of the adjacent bracket plate through bearings, one end of the bidirectional screw rod penetrates one side wall of the adjacent bracket plate and is fixed with a knob, a cross bar is arranged below the bidirectional screw rod, both ends of the cross bar are fixedly connected with one side wall of the adjacent bracket plate, the outer walls at both ends of the bidirectional screw rod are connected with vertical plates by threads, and the vertical plates are slidably connected to the surface of the cross bar, a strip opening is opened on the top of the second disc, the top ends of the vertical plates penetrate the strip opening, a connecting rod is fixed to one side wall of the vertical plate, and an arc plate is fixed to one end of the connecting rod.

[0060] In this embodiment, by arranging a bracket plate, a bidirectional screw rod, a knob, a cross bar, a vertical plate, a connecting rod and an arc plate, the long strip (or long shape) printing base can be fixed on the second disc more conveniently and quickly. By arranging a support plate, a rotating rod, a first disc, a driven gear, a servo motor, a driving gear and a column, the second disc can be driven to rotate, thereby realizing the rotation of the printing base, which well meets the requirements of processing symmetry of some rotating parts and ensures the quality of the processed products; and is suitable for the printing needs of a long strip (or long shape) printing base.

[0061] See also Figure 6 , the lifting drive mechanism includes an L-shaped fixing plate, a hydraulic rod and a hydraulic cylinder arranged in sequence from top to bottom;

[0062] The horizontal portion of the L-shaped fixing plate is connected to the upper end of the hydraulic rod, the vertical portion is connected to the bottom plate of the rotary drive mechanism, and the extending direction of the arc plate is perpendicular to the extending direction of the hydraulic rod.

[0063] In this embodiment, the hydraulic cylinder can drive the hydraulic rod and the L-shaped fixing plate to move up and down when working.

[0064] Specifically, four sliding blocks are symmetrically fixed to the bottom of the first disc, an annular sliding groove is provided on the top of the support plate, and the four sliding blocks are slidably connected in the annular sliding groove.

[0065] In this embodiment, by symmetrically fixing four sliding blocks at the bottom of the first disk and providing an annular sliding groove at the top of the support plate, the first disk can be stably rotated on the support plate.

[0066] Specifically, the threads at both ends of the bidirectional screw rod are in opposite directions, and one side wall of the two vertical plates is respectively provided with threaded holes corresponding to the threads at both ends of the bidirectional screw rod. The two ends of the bidirectional screw rod are respectively threadedly connected to the threaded holes of the corresponding vertical plates, and one side wall of the vertical plates is provided with sliding holes, and the cross bar passes through the sliding holes.

[0067] In this embodiment, one side wall of the two vertical plates is respectively provided with threaded holes corresponding to the threads at both ends of the bidirectional screw rod in order to cooperate with the bidirectional screw rod. By opening a sliding hole on one side wall of the vertical plates, the cross bar can smoothly pass through the vertical plates, so that when the bidirectional screw rod rotates, it can drive the two vertical plates to move in opposite directions.

[0068] Specifically, the surface of the knob is provided with anti-slip grooves.

[0069] In this embodiment, by providing anti-skid patterns on the surface of the knob, a better anti-skid effect can be achieved, thereby making it easier for people to turn the knob.

[0070] Specifically, the surfaces of the arc-shaped plates away from the connecting rods are all fixed with anti-skid rubber pads.

[0071] In this embodiment, by fixing the anti-skid rubber pad on the surface of the arc plate, a better anti-skid effect can be achieved, so that the printing base can be fixed more firmly.

[0072] When the rotary drive mechanism is in use, the end portion of the printing base (base shaft, whose outer circumference is the annular printing base) is placed on the second disc, so that the arc plate and the anti-skid rubber pad are located on the inner side of the base connecting portion of the printing base, and then the knob is turned, the knob can drive the bidirectional lead screw to rotate, the bidirectional lead screw can drive the two vertical plates to move outward, thereby driving the anti-skid rubber pad to tightly contact the inner wall of the base connecting portion, so the printing base can be fixed on the second disc, and then the servo motor is started, the servo motor can drive the driving gear to rotate, the driving gear can drive the driven gear to rotate, thereby driving the rotating rod to rotate, so that the first disc can be driven to rotate, so that the printing base will rotate to perform annular printing.

[0073] According to the description and drawings of the present invention, those skilled in the art can easily manufacture or use the free-degree printing base of the 3D printing device of the present invention, and can produce the positive effects described in the present invention.

[0074] Unless otherwise specified, in the present invention, the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicating orientation or positional relationships are based on the orientation or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the orientation or positional relationship in the present invention are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood in conjunction with the drawings and according to specific circumstances.

[0075] Unless otherwise clearly specified and limited, in the present invention, the terms "disposed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0076] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A degree of freedom printing base for a 3D printing device, characterized in that: It comprises a printing base (2), wherein two ends of the printing base (2) are respectively connected to two synchronously working driving devices, wherein the driving devices comprise a rotating driving mechanism (100) and a lifting driving mechanism (200); The printing base (2) comprises a base connection portion (201) and a base body (202); the base connection portion (201) plays a connecting and fixing role; the base body (202) extends in a long strip shape, and its circumferential surface in the extending direction is a printing support surface (2021); The rotation drive mechanism (100) is connected to the base connection portion (201) and is used to drive the printing base (2) to rotate; The upper part of the lifting drive mechanism (200) is connected to the rotating drive mechanism (100), and the lifting direction of the lifting drive mechanism (200) is perpendicular to the axial direction of the rotating rod (14) of the rotating drive mechanism (100); The rotary drive mechanism (100) comprises a bottom plate (11), support legs (12) are fixed at four corners of the top of the bottom plate (11), a support plate (13) is arranged above the bottom plate (11), the tops of the support legs (12) are fixedly connected to the bottom of the support plate (13), the top of the bottom plate (11) is rotatably connected to a rotating rod (14) via a bearing, the top of the rotating rod (14) passes through the top of the support plate (13) and is fixed with a first disc (15), the top of the rotating rod (14) is connected to the support plate (13) via a bearing 3) a rotation connection, a driven gear (16) is sleeved and fixed on the surface of the rotating rod (14), a servo motor (17) is fixed on the top of the bottom plate (11), a driving gear (18) is fixed on the output shaft of the servo motor (17), the driving gear (18) is meshed and connected with the driven gear (16), four columns (19) are symmetrically fixed on the top of the first disk (15), a second disk (110) is arranged above the first disk (15), and the tops of the columns (19) are all in contact with the bottom of the second disk (110). The first disc (15) is fixedly connected to the first disc (15), a bracket plate (111) is symmetrically fixed on the top of the first disc (15), a bidirectional screw rod (112) is arranged above the first disc (15), both ends of the bidirectional screw rod (112) are rotatably connected to a side wall of an adjacent bracket plate (111) through bearings, one end of the bidirectional screw rod (112) passes through a side wall of an adjacent bracket plate (111) and is fixed with a knob (113), a cross bar (114) is arranged below the bidirectional screw rod (112), and both ends of the cross bar (114) are respectively connected to the One side wall of adjacent bracket plates (111) is fixedly connected, both ends of the outer side walls of the bidirectional screw rod (112) are connected with vertical plates (115) by threads, and the vertical plates (115) are slidably connected to the surface of the cross bar (114), the top of the second disc (110) is provided with a strip-shaped opening (116), the top of the vertical plates (115) passes through the strip-shaped opening (116), one side wall of the vertical plates (115) is fixed with a connecting rod (117), and one end of the connecting rod (117) is fixed with an arc-shaped plate (118); The lifting drive mechanism (200) comprises an L-shaped fixing plate (211), a hydraulic rod (210) and a hydraulic cylinder (29) which are arranged in sequence from top to bottom; The horizontal portion (2111) of the L-shaped fixing plate (211) is connected to the upper end of the hydraulic rod (210), the vertical portion (2112) is connected to the bottom plate (11) of the rotary drive mechanism (100), and the extending direction of the arc plate (118) is perpendicular to the extending direction of the hydraulic rod (210); The base body (202) extends in a long strip shape, and the cross section at any position in the extension direction is circular.

2. The 3D printing device of claim 1, wherein: The base body (202) extends in a cylindrical shape.

3. The 3D printing device of claim 1, wherein: The base connection part (201) is cylindrical.

4. The 3D printing device of claim 1, wherein: Four sliders (119) are symmetrically fixed at the bottom of the first disc (15), an annular sliding groove (120) is provided at the top of the support plate (13), and the four sliders (119) are all slidably connected in the annular sliding groove (120).

5. The 3D printing device of claim 1, characterized in that: The threads at both ends of the bidirectional screw rod (112) are in opposite directions, and one side wall of the two vertical plates (115) is respectively provided with threaded holes (121) corresponding to the threads at both ends of the bidirectional screw rod (112). The two ends of the bidirectional screw rod (112) are respectively threadedly connected to the threaded holes (121) of the corresponding vertical plates (115), and one side wall of each vertical plate (115) is provided with a sliding hole (122), and the cross bar (114) passes through the sliding hole (122).

6. The 3D printing device of claim 1, characterized in that: The surface of the knob (113) is provided with anti-slip grooves.

7. The 3D printing device of claim 1, wherein: The surface of the arc-shaped plate (118) away from the connecting rod (117) is fixed with an anti-skid rubber pad (123).

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