A motion device for a 3D printer

Abstract

The present invention discloses a motion device of a 3D printer, comprising an X-axis motion device, a Y-axis motion device, a Z-axis motion device, a printing platform and an equipment frame for carrying the above components; the X-axis motion device is arranged on the equipment frame, the Y-axis motion device can reciprocate along the X-axis direction under the drive of the X-axis motion device, the Z-axis motion device is arranged perpendicular to a plane formed by the X-axis and the Y-axis and is fixed on the equipment frame, the printing platform can reciprocate along the Z-axis direction under the drive of the Z-axis motion device, and compared with the prior art, the equipment of the present invention has strong operation stability and high printing accuracy.

Description

Technical Field

[0001] The invention belongs to the technical field of 3D printing, and in particular relates to a motion device of a 3D printer. Background Art

[0002] 3D printing technology, also known as additive manufacturing technology, is a technology that evenly discretizes three-dimensional molded parts into multi-layer two-dimensional structures under computer control, and stacks materials layer by layer along a certain path to finally realize the molding and manufacturing of three-dimensional parts. It can manufacture parts of any complex shape without special tools, fixtures, and molds, which can effectively shorten the new product development cycle, reduce the cost of new product development, and meet the market's growing demand for product personalization and customization.

[0003] FDM fused deposition modeling technology is a type of 3D printing technology, which refers to heating thermoplastic filaments to a molten state, using a computer to control the movement of the print head according to the cross-sectional contour trajectory of the molded part, and depositing the molten filaments layer by layer on the printing platform, ultimately achieving three-dimensional manufacturing of the part. It has been widely used in the fields of industrial engineering, art, education, etc. in the design and manufacture of prototypes, product function development and verification, and direct production of special and complex parts.

[0004] For industrial 3D printing equipment, the stability of the motion device is the basis for the smooth operation of the equipment, large load, and printing accuracy. It is also the basis for completing the printing process and obtaining high-quality prints. However, there are few studies on FDM motion devices at home and abroad. When applied to industrial 3D printers, the printing accuracy is low and the operation stability of the equipment is insufficient. Summary of the invention

[0005] In view of the above problems, the present invention provides a motion device for a 3D printer, which has strong operation stability and high printing accuracy.

[0006] The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0007] A motion device of a 3D printer comprises an X-axis motion device, a Y-axis motion device, a Z-axis motion device, a printing platform and an equipment frame for carrying the above components; the X-axis motion device is arranged on the equipment frame, the Y-axis motion device can reciprocate along the X-axis direction under the drive of the X-axis motion device, the Z-axis motion device is arranged perpendicular to a plane formed by the X-axis and the Y-axis and is fixed on the equipment frame, and the printing platform can reciprocate along the Z-axis direction under the drive of the Z-axis motion device.

[0008] Furthermore, the equipment frame includes a first transverse fixing plate, a second transverse fixing plate, a first longitudinal fixing plate, a second longitudinal fixing plate and a bottom support seat for carrying the X-axis motion device and the Y-axis motion device; the X-axis motion device is fixed on the first transverse fixing plate, the top ends of the first longitudinal fixing plate and the second longitudinal fixing plate are fixedly connected to the first transverse fixing plate, and the bottom ends are fixedly connected to the second transverse fixing plate, and the second transverse fixing plate is arranged on the bottom support seat.

[0009] Furthermore, the X-axis motion device includes an X-axis driving device, a connecting plate, a first horizontal guide rail and a second horizontal guide rail; the first horizontal guide rail and the second horizontal guide rail are arranged parallel to the X-axis direction on the equipment frame, and the connecting plate can move back and forth on the first horizontal guide rail and the second horizontal guide rail under the drive of the X-axis driving device.

[0010] Further, the X-axis drive device includes an X-axis motor, an X-axis coupling, two X-axis bearings, two X-axis bearing seats, an X-axis ball screw shaft, an X-axis screw nut and a horizontal transmission block;

[0011] The X-axis motor is arranged on the equipment frame, and the two X-axis bearings are fixed on the equipment frame through two X-axis bearing seats respectively. One end of the X-axis ball screw shaft is sleeved in one of the X-axis bearings, and the other end passes through the other X-axis bearing and is connected with the output shaft of the X-axis motor through the X-axis coupling. The first horizontal slide block and the second horizontal slide block are respectively provided on the first horizontal guide rail and the second horizontal guide rail, and the first horizontal connecting block and the second horizontal connecting block are respectively fixed on the first horizontal slide block and the second horizontal slide block, and the two ends of the connecting plate are respectively fixedly connected to the first horizontal connecting block and the second horizontal connecting block, and the X-axis ball screw nut is sleeved on the X-axis ball screw shaft, the X-axis ball screw nut is fixedly connected to the horizontal transmission block, and the horizontal transmission block is fixedly connected to the first horizontal connecting block.

[0012] Furthermore, a horizontal limit switch is provided below the end of the X-axis ball screw shaft away from the X-axis motor, horizontal elastic pads are provided on both sides of the horizontal transmission block, and horizontal hard limit blocks are provided on the inner sides of the two X-axis bearing seats at both ends of the X-axis ball screw shaft.

[0013] Further, the Y-axis motion device includes a Y-axis driving device and a longitudinal guide rail, the longitudinal guide rail is arranged on the connecting plate along the Y-axis direction, a longitudinal slider is arranged on the longitudinal guide rail, and the Y-axis driving device can drive the longitudinal slider to move back and forth on the longitudinal guide rail;

[0014] The Y-axis driving device includes a Y-axis motor, a Y-axis coupling, two Y-axis bearings, two Y-axis bearing seats, a Y-axis ball screw shaft, a Y-axis screw nut and a longitudinal transmission block; the Y-axis motor is arranged on a connecting plate, the two Y-axis bearings are fixed on the connecting plate through two Y-axis bearing seats respectively, one end of the Y-axis ball screw shaft is internally sleeved in one of the Y-axis bearings, and the other end passes through the other Y-axis bearing and is connected to the output shaft of the Y-axis motor through the Y-axis coupling; a longitudinal connecting block is fixedly provided on the longitudinal sliding block, the Y-axis screw nut is sleeved on the Y-axis ball screw shaft, the Y-axis screw nut is fixedly connected to the longitudinal transmission block, and the longitudinal transmission block is fixedly connected to the longitudinal connecting block.

[0015] Furthermore, a longitudinal limit switch is provided below the end of the Y-axis ball screw shaft away from the Y-axis motor, longitudinal elastic pads are provided on both sides of the longitudinal transmission block, and longitudinal hard limit blocks are provided on the inner sides of the two Y-axis bearing seats at both ends of the Y-axis ball screw shaft.

[0016] Furthermore, the Z-axis motion device includes a Z-axis driving device, a printing platform and four vertical optical axes;

[0017] Four vertical optical axes are perpendicular to the printing platform and are arranged at its four corners. A linear bearing is slidably provided on each vertical optical axis. The linear bearing is fixed with a second vertical connecting block. The four second vertical connecting blocks are respectively fixedly connected to the four corners of the printing platform; the printing platform can reciprocate in the vertical direction under the drive of the Z-axis driving device.

[0018] Further, the Z-axis driving device includes a Z-axis motor, a reducer, a first bevel gear, a second bevel gear, a first transmission shaft, a second transmission shaft, a third bevel gear, a fourth bevel gear, a fifth bevel gear, a sixth bevel gear and two Z-axis lead screw shafts;

[0019] The two Z-axis lead screw shafts are arranged on both sides of the printing platform and are parallel to the vertical optical axis; a Z-axis lead screw nut is provided on the Z-axis lead screw shaft, a first vertical connecting block is fixed on the Z-axis lead screw nut, and the two first vertical connecting blocks are respectively fixedly connected to the two sides of the printing platform; the Z-axis motor is fixed on the equipment frame, the Z-axis motor is connected to the first bevel gear through a reducer, the first bevel gear is meshed with the second bevel gear, the second bevel gear is connected to the third bevel gear through the first transmission shaft, the second bevel gear is connected to the fourth bevel gear through the second transmission shaft, the fifth bevel gear and the sixth bevel gear are respectively fixed on the two Z-axis lead screw shafts, the third bevel gear is meshed with the fifth bevel gear, and the fourth bevel gear is meshed with the sixth bevel gear.

[0020] Furthermore, the connecting plate is a trapezoidal structure.

[0021] The advantages of the present invention mainly lie in the following points:

[0022] 1. The X-axis motion device is connected through a coupling to ensure transmission accuracy, the ball screw ensures the running displacement accuracy, and the two linear guides set parallel to the screw ensure the running direction accuracy. During installation, the coaxiality of the screw shaft, coupling and motor shaft should be ensured; the parallelism of the ball screw and the two horizontal guides; and the horizontality of the frame top plate should be ensured.

[0023] In addition, the limit device adopts both soft and hard limit modes, which plays a double protection role for the moving device and the entire equipment.

[0024] 2. The Y-axis motion device is connected through a coupling to ensure transmission accuracy, the ball screw ensures the running displacement accuracy, and the linear guide rail set parallel to the screw ensures the running direction accuracy. During installation, the coaxiality of the screw shaft, coupling and motor shaft should be ensured; the parallelism of the ball screw and horizontal guide rail; and the horizontality of the upper surface of the tripod should be ensured.

[0025] The limit device adopts both soft and hard limit modes, which plays a double protection role for the moving device and the entire equipment.

[0026] 3. The Z-axis motion device ensures the synchronous movement of the lead screw shafts on both sides through bevel gear transmission, the ball screw ensures the running displacement accuracy, and the two optical axes set parallel to the lead screw ensure the running direction accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention;

[0028] Figure 2 It is a schematic diagram of the X-axis and Y-axis motion devices in the present invention;

[0029] Figure 3 It is a schematic diagram of the X-axis and Y-axis safety limit devices in the present invention;

[0030] Figure 4 This is the working principle diagram of the Z-axis motion device in this invention. DETAILED DESCRIPTION

[0031] In order to further describe the technical features and effects of the present invention, the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0032] The coordinate system in this article takes the starting end of the X-axis ball screw shaft 1-5 as the coordinate origin, the axial direction of the X-axis ball screw shaft 1-5 as the X-axis direction, the axial direction of the Y-axis ball screw shaft as the Y-axis direction, and the axial direction of the Z-axis ball screw shaft as the Z-axis direction.

[0033] Reference Figures 1 to 4As shown, a motion device of a 3D printer includes an X-axis motion device 1, a Y-axis motion device 2, a Z-axis motion device 4, a printing platform 5 and an equipment frame 6 for carrying the above components; the X-axis motion device 1 is arranged on the equipment frame 6, the Y-axis motion device can reciprocate along the X-axis direction under the drive of the X-axis motion device 1, the Z-axis motion device 4 is arranged perpendicular to the plane formed by the X-axis and the Y-axis and is fixed on the equipment frame 6, and the printing platform 5 can reciprocate along the Z-axis direction under the drive of the Z-axis motion device 4.

[0034] Furthermore, the equipment frame 6 includes a first transverse fixing plate 6-1, a second transverse fixing plate 6-2, a first longitudinal fixing plate 6-3, a second longitudinal fixing plate 6-4, and a bottom support seat 6-5 for carrying the above-mentioned components for carrying the X-axis motion device 1 and the Y-axis motion device 2; the X-axis motion device 1 is fixed on the first transverse fixing plate 6-1, the top ends of the first longitudinal fixing plate 6-3 and the second longitudinal fixing plate 6-4 are fixedly connected to the first transverse fixing plate 6-1, and the bottom ends are fixedly connected to the second transverse fixing plate 6-2, and the second transverse fixing plate 6-2 is arranged on the bottom support seat 6-5. The equipment frame adopts a plate structure, which can effectively ensure the flatness of the transverse fixing plate 6-1 and provide stable support for the operating device.

[0035] Furthermore, the X-axis motion device 1 includes an X-axis driving device, a connecting plate 2-14, a first horizontal guide rail 1-8 and a second horizontal guide rail 1-11; the first horizontal guide rail 1-8 and the second horizontal guide rail 1-11 are arranged parallel to the X-axis direction on the equipment frame 6, and the connecting plate 2-14 can move back and forth on the first horizontal guide rail 1-8 and the second horizontal guide rail 1-11 under the drive of the X-axis driving device.

[0036] Further, the X-axis driving device includes an X-axis motor 1-1, an X-axis coupling 1-2, two X-axis bearings 1-3, two X-axis bearing seats 1-4, an X-axis ball screw shaft 1-5, an X-axis screw nut 1-6 and a horizontal transmission block 1-7;

[0037] The X-axis motor 1-1 is arranged on the fixed plate 6-1 of the equipment frame 6, and the two X-axis bearings 1-3 are respectively fixed on the equipment frame 6 through two X-axis bearing seats 1-4. One end of the X-axis ball screw shaft 1-5 is sleeved in one of the X-axis bearings 1-3, and the other end passes through the other X-axis bearing 1-3 and is connected to the output shaft of the X-axis motor 1-1 through the X-axis coupling 1-2. The first horizontal slider 1-9 and the second horizontal slider 1-11 are respectively provided on the first horizontal guide rail 1-8 and the second horizontal guide rail 1-11. Slider 1-12, the first horizontal connecting block 1-10 and the second horizontal connecting block 1-13 are respectively fixed on the first horizontal slider 1-9 and the second horizontal slider 1-12, the two ends of the connecting plate 2-14 are respectively fixedly connected to the first horizontal connecting block 1-10 and the second horizontal connecting block 1-13, the X-axis lead screw nut 1-6 is sleeved on the X-axis ball screw shaft 1-5, the X-axis lead screw nut 1-6 and the horizontal transmission block 1-7 are fixedly connected, and the horizontal transmission block 1-7 and the first horizontal connecting block 1-10 are fixedly connected.

[0038] Furthermore, a horizontal limit switch 1-14 is provided below the end of the X-axis ball screw shaft 1-5 away from the X-axis motor 1-1, horizontal elastic pads 1-16 are provided on both sides of the horizontal transmission block 1-7, and horizontal hard limit blocks 1-15 are provided on the inner sides of the two X-axis bearing seats 1-4 at both ends of the X-axis ball screw shaft 1-5.

[0039] Further, the Y-axis motion device 2 includes a Y-axis driving device and a longitudinal guide rail 2-8, the longitudinal guide rail 2-8 is arranged on the connecting plate 2-14 along the Y-axis direction, a longitudinal slider 2-9 is arranged on the longitudinal guide rail 2-8, and the Y-axis driving device can drive the longitudinal slider 2-9 to move back and forth on the longitudinal guide rail 2-8;

[0040] The Y-axis driving device includes a Y-axis motor 2-1, a Y-axis coupling 2-2, two Y-axis bearings 2-3, two Y-axis bearing seats 2-4, a Y-axis ball screw shaft 2-5, a Y-axis screw nut 2-6 and a longitudinal transmission block 2-7; the Y-axis motor 2-1 is arranged on a connecting plate 2-14, the two Y-axis bearings 2-3 are fixed on the connecting plate 2-14 respectively through two Y-axis bearing seats 2-4, one end of the Y-axis ball screw shaft 2-5 is sleeved in one of the Y-axis bearings 2-3, and the other end passes through the other Y-axis bearing 2-3 and is connected to the output shaft of the Y-axis motor 2-1 through the Y-axis coupling 2-2; a longitudinal connecting block 2-10 is fixedly provided on the longitudinal slider 2-9, the Y-axis screw nut 2-6 is sleeved on the Y-axis ball screw shaft 2-5, the Y-axis screw nut 2-6 and the longitudinal transmission block 2-7 are fixedly connected, and the longitudinal transmission block 2-7 and the longitudinal connecting block 2-10 are fixedly connected.

[0041] Furthermore, a longitudinal limit switch 2-11 is provided below the end of the Y-axis ball screw shaft 2-5 away from the Y-axis motor 2-1, longitudinal elastic pads 2-13 are provided on both sides of the longitudinal transmission block 2-7, and longitudinal hard limit blocks 2-12 are provided on the inner sides of the two Y-axis bearing seats 2-4 at both ends of the Y-axis ball screw shaft 2-5.

[0042] Further, the Z-axis motion device 4 includes a Z-axis driving device, a printing platform 5 and four vertical optical axes 4-17;

[0043] Four vertical optical axes 4-17 are perpendicular to the printing platform 5 and are arranged at its four corners. A linear bearing 4-21 is slidably provided on each vertical optical axis 4-17. The linear bearing 4-21 is fixed with a second vertical connecting block 4-25. The four second vertical connecting blocks 4-25 are respectively fixedly connected to the four corners of the printing platform 5; the printing platform 5 can reciprocate in the vertical direction under the drive of the Z-axis driving device.

[0044] Further, the Z-axis driving device includes a Z-axis motor 4-1, a reducer 4-2, a first bevel gear 4-3, a second bevel gear 4-4, a first transmission shaft 4-5, a second transmission shaft 4-6, a third bevel gear 4-7, a fourth bevel gear 4-8, a fifth bevel gear 4-9, a sixth bevel gear 4-10 and two Z-axis lead screw shafts 4-11;

[0045] The two Z-axis lead screw shafts 4-11 are arranged on both sides of the printing platform 5 and are parallel to the vertical optical axis 4-17; a Z-axis lead screw nut 4-13 is provided on the Z-axis lead screw shaft 4-11, and a first vertical connecting block 4-15 is fixed on the Z-axis lead screw nut 4-13, and the two first vertical connecting blocks 4-15 are respectively fixedly connected to the two sides of the printing platform 5; the Z-axis motor 4-1 is fixed on the equipment frame 6, and the Z-axis motor 4-1 is connected to the first bevel gear 4-3 through the reducer 4-2, and the first bevel gear 4-3 is connected to the second bevel gear 4 -4 meshes to complete the reversal of the input, the second bevel gear 4-4 is connected to the third bevel gear 4-7 through the first transmission shaft 4-5, the second bevel gear 4-4 is connected to the fourth bevel gear 4-8 through the second transmission shaft 4-6, the fifth bevel gear 4-9 and the sixth bevel gear 4-10 are respectively fixed on the two Z-axis screw shafts 4-11, the third bevel gear 4-7 meshes with the fifth bevel gear 4-9, the fourth bevel gear 4-8 meshes with the sixth bevel gear 4-10, completing the reversal of the input and ensuring the synchronization of the two Z-axis screw shafts 4-11.

[0046] Furthermore, the connecting plate 2-14 is a trapezoidal structure.

[0047] When working, the print head 3 is installed on the longitudinal connecting block 2-10, and the entire Y-axis motion device 2 moves along the X-axis direction under the drive of the X-axis motor 1-1. The longitudinal connecting block 2-10 drives the print head 3 to move along the Y-axis direction under the drive of the Y-axis motor 2-1. Before printing a layer, the Z-axis motor 4-1 drives the printing platform 5 to move downward in the vertical direction to continue printing. The four vertical optical axes 4-17 play a guiding role in the movement of the printing platform along the Z-axis direction.

[0048] The above embodiments do not limit the present invention in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation shall fall within the protection scope of the present invention.

Claims

1. A motion device for a 3D printer, characterized in that: The invention comprises an X-axis motion device (1), a Y-axis motion device (2), a Z-axis motion device (4), a printing platform (5), and an equipment frame (6) for carrying the X-axis motion device (1), the Y-axis motion device (2), the Z-axis motion device (4), and the printing platform (5); the X-axis motion device (1) is arranged on the equipment frame (6); the Y-axis motion device can reciprocate along the X-axis direction under the drive of the X-axis motion device (1); the Z-axis motion device (4) is arranged perpendicular to a plane formed by the X-axis and the Y-axis and is fixed on the equipment frame (6); and the printing platform (5) can reciprocate along the Z-axis direction under the drive of the Z-axis motion device (4); The X-axis motion device (1) comprises an X-axis driving device, a connecting plate (2-14), a first horizontal guide rail (1-8) and a second horizontal guide rail (1-11); the first horizontal guide rail (1-8) and the second horizontal guide rail (1-11) are arranged on the equipment frame (6) in parallel along the X-axis direction, and the connecting plate (2-14) can move back and forth on the first horizontal guide rail (1-8) and the second horizontal guide rail (1-11) under the drive of the X-axis driving device; The X-axis drive device comprises an X-axis motor (1-1), an X-axis coupling (1-2), two X-axis bearings (1-3), two X-axis bearing seats (1-4), an X-axis ball screw shaft (1-5), an X-axis screw nut (1-6) and a horizontal transmission block (1-7); the X-axis motor (1-1) is arranged on an equipment frame (6); the two X-axis bearings (1-3) are respectively fixed to the equipment frame (6) through two X-axis bearing seats (1-4); one end of the X-axis ball screw shaft (1-5) is sleeved in one of the X-axis bearings (1-3); the other end passes through the other X-axis bearing (1-3) and is connected to the output shaft of the X-axis motor (1-1) through the X-axis coupling (1-2); a first horizontal slide block (1-9) and a second horizontal slide block (1-11) are respectively provided on the first horizontal guide rail (1-8) and the second horizontal guide rail (1-11). -12, a first horizontal connecting block (1-10) and a second horizontal connecting block (1-13) are respectively fixed on the first horizontal sliding block (1-9) and the second horizontal sliding block (1-12), two ends of the connecting plate (2-14) are respectively fixedly connected to the first horizontal connecting block (1-10) and the second horizontal connecting block (1-13), an X-axis lead screw nut (1-6) is sleeved on the X-axis ball screw shaft (1-5), the X-axis lead screw nut (1-6) and the horizontal transmission block (1-7) are fixedly connected, and the horizontal transmission block (1-7) and the first horizontal connecting block (1-10) are fixedly connected; A horizontal limit switch (1-14) is provided below the end of the X-axis ball screw shaft (1-5) away from the X-axis motor (1-1), horizontal elastic pads (1-16) are provided on both sides of the horizontal transmission block (1-7), and horizontal hard limit blocks (1-15) are provided on the inner sides of two X-axis bearing seats (1-4) at both ends of the X-axis ball screw shaft (1-5).

2. The motion device of a 3D printer according to claim 1, characterized in that: The equipment frame (6) comprises a first transverse fixing plate (6-1), a second transverse fixing plate (6-2), a first longitudinal fixing plate (6-3), a second longitudinal fixing plate (6-4) for carrying the X-axis motion device (1) and the Y-axis motion device (2), and a bottom support seat (6-5) for carrying the above components; the X-axis motion device (1) is fixed on the first transverse fixing plate (6-1); the top ends of the first longitudinal fixing plate (6-3) and the second longitudinal fixing plate (6-4) are fixedly connected to the first transverse fixing plate (6-1); the bottom ends are fixedly connected to the second transverse fixing plate (6-2); and the second transverse fixing plate (6-2) is arranged on the bottom support seat (6-5).

3. The motion device of a 3D printer according to claim 1, characterized in that: The Y-axis motion device (2) comprises a Y-axis driving device and a longitudinal guide rail (2-8); the longitudinal guide rail (2-8) is arranged on a connecting plate (2-14) along the Y-axis direction; a longitudinal slider (2-9) is arranged on the longitudinal guide rail (2-8); the Y-axis driving device can drive the longitudinal slider (2-9) to move back and forth on the longitudinal guide rail (2-8); the Y-axis driving device comprises a Y-axis motor (2-1), a Y-axis coupling (2-2), two Y-axis bearings (2-3), two Y-axis bearing seats (2-4), a Y-axis ball screw shaft (2-5), a Y-axis screw nut (2-6) and a longitudinal transmission block (2-7); the Y-axis motor (2-1) is arranged on the connecting plate (2-14); the two Y-axis bearings (2-3) are respectively fixed to the connecting plate (2-14) through two Y-axis bearing seats (2-4); the Y-axis ball screw shaft (2-5) is One end is sleeved in one of the Y-axis bearings (2-3), and the other end passes through another Y-axis bearing (2-3) and is connected to the output shaft of the Y-axis motor (2-1) via a Y-axis coupling (2-2); a longitudinal connecting block (2-10) is fixedly provided on the longitudinal slider (2-9), a Y-axis lead screw nut (2-6) is sleeved on the Y-axis ball screw shaft (2-5), the Y-axis lead screw nut (2-6) and the longitudinal transmission block (2-7) are fixedly connected, and the longitudinal transmission block (2-7) and the longitudinal connecting block (2-10) are fixedly connected.

4. The motion device of a 3D printer according to claim 3, characterized in that: A longitudinal limit switch (2-11) is provided below the end of the Y-axis ball screw shaft (2-5) away from the Y-axis motor (2-1), longitudinal elastic pads (2-13) are provided on both sides of the longitudinal transmission block (2-7), and longitudinal hard limit blocks (2-12) are provided on the inner sides of two Y-axis bearing seats (2-4) at both ends of the Y-axis ball screw shaft (2-5).

5. The motion device of a 3D printer according to claim 2, characterized in that: The Z-axis motion device (4) comprises a Z-axis drive device, a printing platform (5), and four vertical optical axes (4-17); the four vertical optical axes (4-17) are perpendicular to the printing platform (5) and are arranged at the four corners thereof; a linear bearing (4-21) is slidably provided on each vertical optical axis (4-17); a second vertical connecting block (4-25) is fixedly provided on the linear bearing (4-21); the four second vertical connecting blocks (4-25) are respectively fixedly connected to the four corners of the printing platform (5); the printing platform (5) can reciprocate in the vertical direction under the drive of the Z-axis drive device.

6. The motion device of a 3D printer according to claim 5, characterized in that: The Z-axis driving device comprises a Z-axis motor (4-1), a reducer (4-2), a first bevel gear (4-3), a second bevel gear (4-4), a first transmission shaft (4-5), a second transmission shaft (4-6), a third bevel gear (4-7), a fourth bevel gear (4-8), a fifth bevel gear (4-9), a sixth bevel gear (4-10) and two Z-axis lead screw shafts (4-11); The two Z-axis lead screw shafts (4-11) are arranged on both sides of the printing platform (5) and are arranged parallel to the vertical optical axis (4-17); a Z-axis lead screw nut (4-13) is provided on the Z-axis lead screw shaft (4-11), a first vertical connecting block (4-15) is fixed on the Z-axis lead screw nut (4-13), and the two first vertical connecting blocks (4-15) are respectively fixedly connected to both sides of the printing platform (5); the Z-axis motor (4-1) is fixed on the equipment frame (6), and the Z-axis motor (4-1) is connected to the first bevel gear (4-3) through the reducer (4-2). ), the first bevel gear (4-3) meshes with the second bevel gear (4-4), the second bevel gear (4-4) is connected to the third bevel gear (4-7) via the first transmission shaft (4-5), the second bevel gear (4-4) is connected to the fourth bevel gear (4-8) via the second transmission shaft (4-6), the fifth bevel gear (4-9) and the sixth bevel gear (4-10) are respectively fixed on two Z-axis screw shafts (4-11), the third bevel gear (4-7) meshes with the fifth bevel gear (4-9), and the fourth bevel gear (4-8) meshes with the sixth bevel gear (4-10).

7. The motion device of a 3D printer according to claim 1, characterized in that: The connecting plate (2-14) is a trapezoidal structure.

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