Lifting printing platform mechanism and 3D printing device

Abstract

The invention relates to a lifting printing platform mechanism and a 3D printing device.The lifting printing platform mechanism comprises a supporting plate used for being fixed to a horizontal beam at the bottom of a frame, lead screw lifting mechanisms are arranged at the two ends of the front side of the supporting plate, a lead screw lifting mechanism is arranged in the middle of the rear side of the supporting plate, and each of the three lead screw lifting mechanisms comprises a rotation driving part fixed to the supporting plate; an output shaft of the rotation driving piece is connected with the bottom end of the lead screw, the lead screw is connected with a lead screw sliding block, the lead screw sliding block is in sliding connection with the sliding rail, the bottom end of the sliding rail is fixed to the supporting plate, and the axes of the sliding rail and the lead screw of the two lead screw lifting mechanisms on the first side are located on the same first plane parallel to the edge of the first side. The axes of the lead screws and the sliding rails of the lead screw lifting mechanisms in the middle of the second side are located on a second plane which passes through the middle of the first plane and is perpendicular to the first plane, lead screw sliding blocks of the three lead screw lifting mechanisms are connected with the printing platform, and the service life of the frame is long through the mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and particularly to a lifting printing platform mechanism and a 3D printing device. Background Art

[0002] The statements herein only provide background art related to the present invention and do not necessarily constitute prior art.

[0003] After decades of development, the fused deposition modeling (FDM) 3D printing technology has now become one of the most widely used 3D printing technologies. Its forming principle is to extrude a thermoplastic material into a high-temperature nozzle through an extrusion gear, melt and flow out, and deposit it on the printing platform, layer by layer stacking to form a three-dimensional model.

[0004] Currently, the structure of the printing platform of consumer-level 3D printing devices usually adopts 1-2 motors for driving. The leveling process during the printing process relies on the hot bed compensation of the nozzle. As three points determine a plane, this solution cannot substantially achieve the automatic leveling of the printing platform. There is currently a 3D printing device in which the printing platform is connected to three screw lifting mechanisms distributed in a triangle. With this setting method, the leveling work of the printing platform can be carried out. However, when using the above method, the slide rails of the screw lifting mechanism are fixed on the vertical beams of the frame, and the motor of the screw lifting mechanism is fixed on the horizontal beam of the frame through a fixing plate. The screws of its two screw lifting mechanisms are arranged at both ends on one side of the frame, and the other screw is arranged in the middle position on the other side of the frame. Since the motor at the bottom of this screw is installed on the horizontal beam through the fixing plate, the vertical beam on this side cannot be arranged in the middle position of the frame. Therefore, the frame structure is asymmetric, the force is unbalanced, which makes the installation error larger, and the service life of the frame is shortened. Moreover, in traditional 3D printing devices, the timing belt for driving the print head is located above the X-direction slide rail and is exposed. On the one hand, affected by the heat dissipation of the print head, the working temperature is relatively high, and the service life is shortened. On the other hand, it is easy for the staff to accidentally touch the timing belt, and the safety is poor. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art and provide a lifting printing platform mechanism and a 3D printing device, so that the frame structure of the printing device is a symmetric structure, can maintain balance, and extend the service life.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] In a first aspect, an embodiment of the present invention provides a lifting printing platform mechanism, which includes a support plate for fixing on the bottom horizontal beam of the frame. At both ends of the front side of the support plate, screw rod lifting mechanisms are provided, and at the middle position of the rear side of the support plate, a screw rod lifting mechanism is provided. All three screw rod lifting mechanisms include a rotational driving member fixed on the support plate. The output shaft of the rotational driving member is connected to the bottom end of the screw rod. The screw rod is connected with a screw slider, and the screw slider is slidably connected to the slide rail. The bottom end of the slide rail is fixed on the support plate. The axes of the slide rails and screw rods of the two screw rod lifting mechanisms on the first side are located in the same first plane parallel to the first side edge. The axes of the screw rod and slide rail of the screw rod lifting mechanism at the middle position of the second side are located in a second plane passing through the middle of the first plane and perpendicular to the first plane. The screw sliders of the three screw rod lifting mechanisms are connected to the printing platform.

[0008] Optionally, fixing holes for the rotational driving member are provided on the support plate. The rotational driving member is arranged below the support plate, its housing is fixed in the fixing holes for the rotational driving member, and its output shaft is connected to the bottom end of the screw rod through a coupling.

[0009] Optionally, threading holes and heat dissipation holes are further provided on the support plate.

[0010] Optionally, the printing platform includes a support bottom plate, the support bottom plate is connected to the bottom ends of a plurality of isolation columns, the top ends of the plurality of isolation columns are connected to a hot bed, a soft magnetic sticker is laid on the hot bed, and a PEI texture plate is adsorbed and fixed on the upper surface of the soft magnetic sticker.

[0011] Optionally, two L-shaped limiting blocks are provided at the rear end of the support bottom plate, and the limiting blocks respectively match the end corners of the rear edge of the PEI texture plate.

[0012] In a second aspect, an embodiment of the present invention provides a 3D printing device, which includes a frame. The bottom of the frame is provided with the lifting printing platform mechanism described in the first aspect. A horizontal two-axis linkage mechanism is provided at the top of the frame. The horizontal two-axis linkage mechanism is connected to a printing head mechanism, and the printing head mechanism is connected to an extrusion mechanism fixed at the top of the frame.

[0013] Optionally, the printing head mechanism includes a printing head assembly. The printing head assembly is connected to the horizontal two-axis linkage mechanism through a fixing member. A first blower is provided at the top of the printing head assembly. A diversion cover fixed on the fixing member is provided on the outer periphery of the bottom of the printing head assembly, and a second blower fixed on the fixing member is provided behind the diversion cover.

[0014] Optionally, the horizontal two-axis linkage mechanism includes an X-axis slide rail. The two ends of the X-axis slide rail are respectively slidably connected to the first Y-axis slide rail and the second Y-axis slide rail. The print head mechanism is slidably connected to the X-axis slide rail. The print head assembly is connected to the first synchronous belt mechanism. The first synchronous belt mechanism can drive the print head assembly to move along the X-axis slide rail. The X-axis slide rail is connected to the second synchronous belt mechanism. The second synchronous belt mechanism can drive the X-axis slide rail to move along the first Y-axis slide rail and the second Y-axis slide rail.

[0015] Optionally, the first synchronous belt mechanism includes a first synchronous belt. One end of the first synchronous belt is fixed to the first fixing component on the back of the print head mechanism. The first synchronous belt sequentially bypasses the first reversing wheel at one end of the X-axis slide rail, the first tensioning wheel at the front end of the first Y-axis slide rail, the second reversing wheel at the rear end of the first Y-axis slide rail, the first driving wheel, the third reversing wheel at the rear end of the first Y-axis, the fourth reversing wheel at the rear end of the second Y-axis slide rail, and the fifth reversing wheel at the other end of the X-axis slide rail, and then the other end is fixed to the second fixing component on the back of the print head mechanism. The first driving wheel is connected to the first driving member fixed on the first Y-axis slide rail.

[0016] Optionally, the second synchronous belt mechanism includes a second synchronous belt. One end of the second synchronous belt is fixed to the first fixing component on the back of the print head mechanism. The second synchronous belt sequentially bypasses the sixth reversing wheel of the sliding member at one end of the X-axis slide rail, the third reversing wheel, the fourth reversing wheel, the second driving wheel of the support seat at the rear end of the second Y-axis slide rail, the seventh reversing wheel of the support seat at the rear end of the second Y-axis slide rail, the second tensioning wheel at the front end of the second Y-axis slide rail, and the eighth reversing wheel of the sliding member at the other end of the X-axis slide rail, and then the other end is fixedly connected to the second fixing component on the back of the print head mechanism. The second driving wheel is connected to the second driving member fixed on the second Y-axis slide rail.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. In the lifting print platform mechanism of the present invention, a support plate is provided. The three screw lifting mechanisms are fixed on the support plate instead of on the frame, so that the plane where the slide rail and the axis of the screw of the screw lifting mechanism at the rear side can vertically pass through the middle of the front edge of the support plate. Furthermore, the vertical beam at the rear side of the frame can be arranged at the middle position, making the frame a symmetric structure, capable of maintaining balance, avoiding installation errors, and prolonging the service life of the frame.

[0019] 2. In the lifting print platform mechanism of the present invention, in the print platform, two L-shaped limit blocks are provided at the rear end of the support bottom plate. When installing the PEI texture board, the two ends at the rear end of the PEI texture board can respectively cooperate with the two limit blocks, playing a limiting role for the PEI texture board and facilitating the installation of the PEI texture board.

[0020] 3. The 3D printing device of the present invention is provided with a second blower behind the print head assembly, and its outer periphery on both sides is covered with a flow guide cover. Compared with the traditional setting of the blower on both sides of the print head assembly, the volume occupied by the print head assembly is reduced.

[0021] 4. In the 3D printing device of the present invention, both the first synchronous belt and the second synchronous belt are connected to the first fixing component and the second fixing component on the back of the print head mechanism, so that the parts of the first synchronous belt and the second synchronous belt corresponding to the X-direction slide rail are all arranged behind the X-direction slide rail. The distance between the synchronous belt and the print head mechanism is increased, so that the temperature of the synchronous belt during operation is reduced, the service life of the synchronous belt is improved, and at the same time, the hands of the staff will not touch the synchronous belt, making the operation safer. In addition, the synchronous belt is arranged behind the X-direction slide rail, so that the movement stroke of the print head mechanism becomes larger, allowing a larger printing area to be constructed and realizing modular expansion. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The specification drawings forming a part of the present application are used to provide a further understanding of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute a limitation to the present application.

[0023] Figure 1 It is a schematic diagram of the arrangement of three lead screw lifting mechanisms on the support plate in Embodiment 1 of the present invention;

[0024] Figure 2 It is an exploded view of the printing platform in Embodiment 1 of the present invention;

[0025] Figure 3 It is a schematic diagram of the overall structure in Embodiment 2 of the present invention;

[0026] Figure 4 It is a schematic diagram of the frame structure in Embodiment 2 of the present invention;

[0027] Figure 5 It is a schematic diagram of the structure of the print head mechanism in Embodiment 2 of the present invention Figure 1 ;

[0028] Figure 6 It is a schematic diagram of the structure of the print head mechanism in Embodiment 2 of the present invention Figure 2 ;

[0029] Figure 7 It is a schematic diagram of the structure of the horizontal two-axis linkage mechanism in Embodiment 2 of the present invention Figure 1 ;

[0030] Figure 8 It is a schematic diagram of the structure of the horizontal two-axis linkage mechanism in Embodiment 2 of the present invention Figure 2 ;

[0031] Figure 9 It is a schematic diagram of the first synchronous belt mechanism in Embodiment 2 of the present invention;

[0032] Figure 10 It is a schematic diagram of the second synchronous belt mechanism in Embodiment 2 of the present invention;

[0033] Figure 11 It is a schematic diagram of the extrusion mechanism in Embodiment 2 of the present invention;

[0034] Figure 12 It is a schematic diagram at the rear side shell plate of the frame in Embodiment 2 of the present invention;

[0035] Among them, 1. Support plate, 2. First screw lifting mechanism, 3. Second screw lifting mechanism, 4. Third screw lifting mechanism, 5. Stepper motor, 6. Screw, 7. Rigid coupling, 8. Screw nut fixing part, 9. Screw nut, 10. Screw slider, 11. Screw slide rail, 12. Fixed hole position for rotation driving part, 13. Wire threading hole, 14. Heat dissipation hole, 15. Support bottom plate, 16. Heat insulation column, 17. Heat bed, 18. Soft magnetic sticker, 19. PE I texture board, 20. Limit block, 21. Frame, 22. Horizontal two-axis linkage mechanism, 23. Print head mechanism, 24. Extrusion mechanism, 25. Feeding hose, 26. Main board fixing sheet metal part, 27. Power supply fixing sheet metal part, 28. Control main board, 29. Power supply, 30. Three-pin power socket, 31. Type-c female socket, 32. LED lamp switch;

[0036] 21-1. Bottom rectangular frame, 21-2. Top rectangular frame, 21-3. Column, 21-4. Horizontal beam, 21-5. Horizontal beam, 21-6. Horizontal beam, 21-7. Horizontal beam, 21-8. Vertical beam;

[0037] 22-1. X-direction slide rail 22-2. Sliding part, 22-3. First Y-direction slide rail, 22-4. Second Y-direction slide rail, 22-5. First synchronous belt, 22-6. First reversing wheel, 22-7. First tensioning wheel, 22-8. Rear support seat of the first Y-direction slide rail, 22-9. Second reversing wheel, 22-10. First driving wheel, 22-11. Third reversing wheel, 22-12. Rear support seat of the second Y-direction slide rail, 22-15. First motor, 22-16. Sixth reversing wheel, 22-17. Second driving wheel, 22-18. Seventh reversing wheel, 22-19. Second tensioning wheel, 22-20. Eighth reversing wheel, 22-21. Second synchronous belt;

[0038] 23-1. Print head assembly, 23-2. Fixing part, 23-3. First blower, 23-4. Air deflector, 23-5. Blower fixing seat, 23.6. Second blower, 23-7. Drag chain and cable fixing part, 23-8. X-direction limit switch, 23-9. Vertical limit switch;

[0039] 23-2-1. First fixing column, 23-2-2. Clip, 23-2-3. Second fixing column;

[0040] 24-1. Extruder, 24-2. Extrusion motor, 24-3. Extrusion wheel, 24-4. Extruder connector. Detailed implementation mode

[0041] Embodiment 1

[0042] This embodiment provides a lifting printing platform mechanism, as Figure 1 shown, including a support plate 1. The support plate 1 is a rectangular plate with a front edge, a rear edge and two side edges. The two ends of the front edge are provided with screw rod lifting mechanisms, namely a first screw rod lifting mechanism 2 and a second screw rod lifting mechanism 3, and a screw rod lifting mechanism is arranged at the middle position of the rear edge, which is a third screw rod lifting mechanism 4. The structures of the first screw rod lifting mechanism 2, the second screw rod lifting mechanism 3 and the third screw rod lifting mechanism 4 are exactly the same.

[0043] The first screw rod lifting mechanism 2, the second screw rod lifting mechanism 3 and the third screw rod lifting mechanism 4 all include a rotation driving part. The rotation driving part is a motor. Preferably, the motor is a stepping motor 5. The output shaft of the motor is connected with the bottom end of the screw rod 6 through a rigid coupling 7. Preferably, the screw rod 6 is a trapezoidal screw rod. A screw nut 9 is arranged on the screw rod 6. The screw nut 9 is an H-type screw nut. The screw nut 9 is fixedly connected with the screw slider 10 through a screw nut fixing part 8. The screw slider 10 is slidably connected with a screw rod slide rail 11 arranged on one side of the screw rod 6.

[0044] The motor drives the screw rod 6 to rotate, and the screw slider 10 can move up and down along the axis direction of the screw rod 6.

[0045] Specifically, the bottom end of the screw rod slide rail 11 of the first screw rod lifting mechanism 2 is fixedly connected with the support plate 1 through a slide rail fixing hole position arranged at the front end of one side edge of the support plate 1. The motor of the first screw rod lifting mechanism 2 is arranged below the support plate 1, and the housing of the motor is fixedly connected with the support plate 1 through a rotation driving part fixing hole position 12 arranged on the support plate 1.

[0046] In this embodiment, the axis of the screw rod slide rail 11 and the screw rod 6 of the first screw rod lifting mechanism 2 are located in the same plane parallel to the front side edge of the support plate 1.

[0047] The structure of the second screw rod lifting mechanism 3 and its fixing manner with the support plate 1 are exactly the same as those of the first screw rod lifting mechanism 2, and will not be repeated here.

[0048] In this embodiment, the axes of the screw rod slide rail 11, the screw rod 6 of the first screw rod lifting mechanism 2, the screw rod slide rail 11 and the screw rod 6 of the second screw rod lifting mechanism 3 are located in the same first plane, and this first plane is parallel to the front and rear side edges of the support plate 1.

[0049] The first lead screw lifting mechanism 2 and the second lead screw lifting mechanism 3 are arranged in mirror symmetry with respect to the middle of the front edge of the support plate 1.

[0050] The bottom end of the lead screw slide rail 11 of the third lead screw lifting mechanism 4 is fixedly connected to the support plate 1 through the slide rail fixing hole provided at the rear edge of the support plate 1. The motor is fixedly connected to the support plate 1 through the rotation driving element fixing hole 12 provided in the middle of the rear end of the support plate, and the motor is located below the support plate 1. The lead screw slide rail 11 of the third lead screw lifting mechanism 4 and the axis of the lead screw 6 are located on the same second plane, and the second plane is perpendicular to the first plane and passes through the midpoints of the front and rear edges of the support plate 1.

[0051] With this setting method, the motors of the three lead screw lifting mechanisms do not need to be fixed on the horizontal beam at the bottom of the frame through the fixing plate, so that the vertical beam at the rear of the frame can be arranged at the middle position of the frame, making the frame a symmetric structure, capable of maintaining balance, avoiding installation errors, and extending the service life of the frame.

[0052] Furthermore, a wire threading hole 13 and a heat dissipation hole 14 are also provided at the rear end of the support plate 1. The wire threading hole is used for passing the wires of the motor, and the heat dissipation hole 14 is used for dissipating heat from the support plate 1.

[0053] Notches are provided at the four corners of the support plate 1 for the vertical beams of the frame to pass through.

[0054] A plurality of fixing holes are provided at the four edges of the support plate 1. Among them, the fixing holes located at the rear edge are elongated holes extending to the rear edge. The support plate can be fixedly connected to the horizontal beam at the bottom of the frame through the fixing holes and bolts.

[0055] The lead screw sliders 10 of the first lead screw lifting mechanism 2, the second lead screw lifting mechanism 3 and the third lead screw lifting mechanism 4 are connected to the printing platform and can drive the printing platform to move up and down.

[0056] In this embodiment, as Figure 2 shown, the printing platform can adopt the printing platform structure of the existing 3D printing device, including a support bottom plate 15. The support bottom plate 15 is provided with fixing holes and is fixedly connected to the lead screw nut fixing parts 8 of the three lead screw lifting mechanisms through the fixing holes and bolts.

[0057] The upper surface of the support bottom plate 15 is fixedly connected to the bottom ends of a plurality of heat insulation columns 16. In this embodiment, the heat insulation columns 16 are made of metal columns. The top ends of the heat insulation columns 16 are fixedly connected to the bottom surface of the heat bed 17. A soft magnetic sticker 18 is laid and fixed on the top surface of the heat bed 17, and a PE I texture board 19 is laid and adsorbed and fixed on the top surface of the soft magnetic sticker.

[0058] The hot bed 17, the soft magnetic sticker 18 and the PEI texture board 19 can adopt the existing technologies, and their specific structures will not be described in detail herein.

[0059] This embodiment is improved on the basis of the existing printing platform structure. Two L-shaped limit blocks 20 are fixed at the rear end of the support bottom plate 15. The limit blocks 20 match the two end parts at the rear of the PEI texture board 19. When the PEI texture board 19 is laid on the soft magnetic sticker 18, first, the rear end of the PEI texture board 19 is stuck between the two limit blocks 20 to position the PEI texture 19, and then the PEI texture board 19 is laid on the soft magnetic sticker 18.

[0060] Through the setting of the limit blocks 20, the laying work of the PEI texture board 19 is more convenient.

[0061] The lifting of the entire printing platform can be driven by three screw rod lifting mechanisms. By finely adjusting the three screw rod lifting mechanisms, the leveling work of the printing platform can be achieved.

[0062] Embodiment 2

[0063] This embodiment provides a 3D printing device, as Figure 3 shown, which includes a frame 21. The frame 21 is formed by welding horizontal beams and vertical beams. The lifting printing platform mechanism described in Embodiment 1 is fixed to the four horizontal beams at the bottom of the frame 21.

[0064] A horizontal two-axis linkage mechanism 22 is installed at the top of the frame 21. The horizontal two-axis linkage mechanism 22 is connected to the print head mechanism 23 and is used to drive the print head mechanism 23 to move in the X direction and the Y direction in the horizontal plane.

[0065] An extrusion mechanism 24 is further provided at the top of the frame 21. The extrusion mechanism 24 is connected to the print head mechanism 23 through a feeding hose 25 and is used to feed printing materials into the print head mechanism 23.

[0066] As Figure 4As shown, the frame 21 includes a bottom rectangular frame 21-1 and a top rectangular frame 21-2. Columns 21-3 are provided between the four corners of the bottom rectangular frame 21-1 and the top rectangular frame 21-2. The bottom rectangular frame 21-1 and the top rectangular frame 21-2 are enclosed by four horizontal beams. The bottom rectangular frame 21-2 is fixed to the support plate 1. The column 21-2 is made of a vertical beam. Between the tops of the columns 21-2 on the two sides of the frame, there are two horizontally distributed horizontal beams. Among them, the lower horizontal beam 21-4 is used to fix the Y-direction slide rail in the horizontal two-axis linkage mechanism 22. The upper horizontal beam 21-5 on one side is used to fix the drag chain. The horizontal beam 21-6 on the other side fixes the LED lamp. Between the tops of the two columns 21-4 at the rear of the frame, there is a horizontal beam 21-7 for fixing the material extrusion mechanism. On both sides and the rear side of the frame, there is a vertical beam 21-8 respectively for fixing to the screw slide rail of the screw lifting mechanism.

[0067] In this embodiment, as Figure 5 - Figure 6 shown, the print head mechanism 23 includes a print head assembly 23-1. The print head assembly 23-1 adopts an existing color mixing print head assembly, including a material pipe composed of three groups of throat pipes and heat dissipation pipes. The three groups of material pipes are fixed on the print head connecting piece and are connected to the nozzle at the bottom end. The nozzle adopts a double-layer heat insulation structure. The outer layer is wrapped by a cut asbestos rubber plate, and the inner layer is filled with high-temperature heat insulation cotton. While ensuring the full melting and mixing of multi-color materials, it reduces the problem of nozzle blockage caused by heat accumulation. Each material pipe is connected to the corresponding material extrusion mechanism fixed on the top of the frame.

[0068] The print head assembly 23-1 is connected to the front side of the fixing piece 23-2, and the fixing piece 23-2 is connected to the horizontal two-axis linkage mechanism 22.

[0069] Above the print head assembly 23-1, there is a first blower 23-3 for cooling the throat pipes of the print head assembly. Behind the bottom of the print head assembly 23-1, there is a flow guide cover 23-4. The flow guide cover 23-4 adopts a U-shaped structure. The bottom of the print head assembly 23-1 is located inside the U-shaped structure, and the U-shaped structure wraps the two sides of the bottom of the print head assembly 23-1. Behind the flow guide cover 23-4, there is a second blower 23-6 for blowing materials, which is fixed to the bottom of the fixing piece 23-2 through a blower fixing seat 23-5. Correspondingly, the flow guide cover 23-4 is provided with an air duct that cooperates with the second blower 23-6.

[0070] In this embodiment, through the setting of the second blower 23-6, precise temperature zone control from melting (220°C) to solidification (60°C) of the material is achieved. The double-layer heat insulation structure of the color mixing nozzle makes the temperature fluctuation less than ±0.2°C. Cooperating with the stepped melting cavity, different color materials are fully mixed at the molecular level, effectively reducing the incidence of nozzle blockage.

[0071] In this embodiment, behind the print head assembly 23-1, a drag chain and cable fixing member 23-7 is provided on the top surface of the fixing member 23-2. An X-direction limit switch 23-8 is provided on one side of the drag chain and cable fixing member 23-7, which is used to limit the horizontal X-direction movement of the print head mechanism.

[0072] A vertical limit switch 23-9 is also provided on one side of the fixing member 23-2, which is used to limit the distance between the print head mechanism and the printing platform.

[0073] The fixing member 23-2 adopts an inverted U-shaped structure. A drag chain and cable fixing member 23-7 is provided on its top surface. The print head assembly 23-1 is fixed on its front side surface. A space through which the X-direction slide rail of the horizontal two-axis linkage mechanism passes is provided.

[0074] As Figure 7 - Figure 10 shown, the horizontal two-axis linkage mechanism 22 includes an X-direction slide rail 22-1. Sliding members 22-2 are provided at both ends of the X-direction slide rail 22-1. The sliding member 22-2 at one end is slidably connected to the first Y-direction slide rail 22-3, and the sliding member 22-2 at the other end is slidably connected to the second Y-direction slide rail 22-4. Both the first Y-direction slide rail 22-3 and the second Y-direction slide rail 22-4 are fixedly connected to the frame.

[0075] The X-direction slide rail 22-1 can slide along the first Y-direction slide rail 22-3 and the second Y-direction slide rail 22-4 in the Y direction. The X-direction slide rail 22-1 passes through the space inside the fixing member 23-2 of the print head mechanism 23 and is slidably connected to the fixing member 23-2. The print head mechanism 23 can move in the X direction through the X-direction slide rail 22-1.

[0076] Wherein the X direction and the Y direction are two mutually perpendicular directions in the horizontal plane.

[0077] The fixing member of the print head mechanism 23 is connected to the first synchronous belt mechanism. The first synchronous belt mechanism can slide the print head mechanism along the X-direction slide rail 22-1. The X-direction slide rail 22-1 is connected to the second synchronous belt mechanism. The second synchronous belt mechanism can drive the X-direction slide rail 22-1 and the print head mechanism 23 to move along the first Y-direction slide rail 22-3 and the second Y-direction slide rail 22-4, thereby realizing the movement of the print head mechanism 23 in the X direction and the Y direction.

[0078] The first synchronous belt mechanism includes a first synchronous belt 22-5. One end of the first synchronous belt 22-5 is fixed to a first fixing component arranged on the rear side of a fixing member 23-2. The first fixing component includes a first fixing column 23-2-1 and a clip 23-2-2 outside the first fixing column. Specifically, the end of the first synchronous belt 22-5 bypasses the first fixing column and is clamped and fixed by the clip 23-2-2 arranged on the fixing member. The clip is made of elastic metal or plastic and can clamp and fix the first synchronous belt. With this fixing form for the synchronous belt, compared with the traditional form of using a fixing negative film, a clip seat and multiple bolts for fixing, the complexity of parts, the processing difficulty and the assembly difficulty are reduced.

[0079] The first synchronous belt 22-5 sequentially bypasses a first reversing wheel 22-6 on a sliding member at one end of an X-direction slide rail 22-3, a first tensioning wheel 22-7 at the front end of a first Y-direction slide rail, a second reversing wheel 22-9 on a rear support seat 22-8 at the rear end of the first Y-direction slide rail, a first driving wheel 22-10 on the rear support seat 22-8 at the rear end of the first Y-direction slide rail, a third reversing wheel 22-11 on the rear support seat 22-8 at the rear end of the first Y-direction slide rail, a fourth reversing wheel 22-13 on a rear support seat 22-12 of a second Y-direction slide rail, and a fifth reversing wheel 22-14 on a sliding member at the other end of the X-direction slide rail. Then, the other end thereof is fixed to a second fixing component on the back of the fixing member. The second fixing component includes a second fixing column and a clip. This end of the first synchronous belt bypasses the second fixing column 23-2-3 and is clamped and fixed by the clip on the fixing member 23-2. The first driving wheel 22-10 is connected to a first driving member fixed on the rear support seat of the first Y-direction slide rail. In this embodiment, the first driving member can be a first motor 22-15.

[0080] The second synchronous belt mechanism includes a second synchronous belt 22-21. The second synchronous belt 22-21 is located below the first synchronous belt. One end of the second synchronous belt is fixed to the first fixing component, and the fixing method is the same as that of the first synchronous belt. The second synchronous belt 22-21 sequentially bypasses a sixth reversing wheel 22-16 on a sliding member at one end of the X-direction slide rail, the third reversing wheel 22-11, the fourth reversing wheel 22-13, a second driving wheel 22-17 on a rear support seat of the second Y-direction slide rail, a seventh reversing wheel 22-18 on the rear support seat of the second Y-direction slide rail, a second tensioning wheel 22-19 at the front end of the second Y-direction slide rail, and an eighth reversing wheel 22-20 on a sliding member at the other end of the X-direction slide rail. Then, the other end thereof is fixedly connected to a second fixing component arranged on the back of the fixing member, and its fixing method is the same as that of the first synchronous belt and the second fixing component, which will not be repeated here. The second driving wheel 22-17 is connected to a second driving member fixed on the rear support seat of the second Y-direction slide rail, and the second driving member can be a second motor.

[0081] In this embodiment, when the first motor rotates, it can drive the fixing member and the print head mechanism to move in the X direction along the X-direction slide rail through the first synchronous belt. When the second motor rotates, it can drive the X-direction slide rail to move in the Y direction along the first Y-direction slide rail and the second Y-direction slide rail through the second synchronous belt.

[0082] Further, the first tension pulley is rotatably connected to the first tension pulley bracket 22-18. The first tension pulley bracket 22-18 is slidably connected to the first Y-direction slide rail, and the first tension pulley bracket 22-18 is threadedly connected with a locking bolt. The locking bolt can contact the first Y-direction slide rail to lock and fix the first tension pulley bracket to the first Y-direction slide rail by using the locking bolt.

[0083] The second tension pulley is rotatably connected to the second tension pulley bracket 22-19. The second tension pulley bracket is slidably connected to the second Y-direction slide rail, and the second tension pulley bracket is threadedly connected with a locking bolt. The locking bolt can contact the second Y-direction slide rail to lock and fix the second tension pulley bracket to the second Y-direction slide rail by using the locking bolt.

[0084] The positions of the first tension pulley and the second tension pulley can be adjusted to meet the adjustment of the tension of the first synchronous belt and the second synchronous belt.

[0085] In this embodiment, a fixing column mounting plate is vertically provided on the rear side surface of the fixing member. The middle parts of the first fixing column and the second fixing column are fixed to the fixing column mounting plate. The two fixing column parts above the fixing column mounting plate are connected to the first synchronous belt, and the two fixing column parts below are connected to the second synchronous belt. Clamping pieces are provided on the outer sides of the first fixing column and the second fixing column for clamping the synchronous belt.

[0086] With this setting method, both the first synchronous belt and the second synchronous belt are arranged behind the X-direction slide rail and are hidden, meeting the appearance requirements. The distance between the synchronous belt and the print head mechanism is increased, so that the temperature of the synchronous belt during operation is reduced, the service life of the synchronous belt is improved, and at the same time, the hands of the staff will not touch the synchronous belt, making the operation safer. In addition, the synchronous belt is arranged behind the X-direction slide rail, so that the movement stroke of the print head mechanism becomes larger, allowing a larger printing area to be constructed and realizing modular expansion, such as a laser engraving head and a writing head.

[0087] In this embodiment, the first synchronous belt and the second synchronous belt are mirror-symmetrically arranged, so that the forces on the X-direction slide rail and the Y-direction slide rail are more uniform. The second reversing pulley and the fourth reversing pulley form a parallelogram force system, constituting a redundant path, avoiding the situation of single-wheel jamming, and reducing the XY-axis coupling error.

[0088] Both the first driving pulley and the second driving pulley are toothed synchronous pulleys, which increase the transmission accuracy and stability.

[0089] At the rear end of the top of the said frame, there are three material extrusion mechanisms. The material extrusion mechanism is connected to one end of the material conveying hose, and the other end of the material conveying hose is connected to the corresponding material pipe in the print head mechanism.

[0090] The said material extrusion mechanism can adopt the existing technology, such as Figure 11 As shown, it includes an extruder 24-1, an extrusion motor 24-2, an extrusion wheel 24-3, and an extruder connecting part 24-4. The extrusion mechanism is fixed on the horizontal beam through the extruder connecting part. The extrusion motor adopts a reduction motor with a ratio of 1:5.18, which can achieve precise extrusion of the consumables.

[0091] In the 3D printing device of this embodiment, shell plates are also provided on two sides and the rear of the frame, such as Figure 12 As shown, on the shell plate at the rear end, there are a main board fixing sheet metal part 26 and a power supply fixing sheet metal part 27. On the main board fixing sheet metal part 26, there is a control main board 28. The control main board is connected to each motor to control the operation of each motor. The proximity switch is connected to the control main board and can send signals to the control main board. On the outside of the control main board, there are two heat dissipation fans 33 fixed to the main board fixing sheet metal part. Inside the power supply fixing sheet metal part, there is a power supply 29. At the bottom of the power supply fixing sheet metal part, there is also a power supply interface connected to the power supply for connecting the power supply. The power supply interface integrally has a three-pin power socket 30, a Type-c female socket 31, and an LED light switch 32.

[0092] For the parts not described in detail in the 3D printing device, the existing technology can be adopted and no further detailed description will be given here.

[0093] Although the specific implementation manners of the present invention are described above in conjunction with the accompanying drawings, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that based on the technical solution of the present invention, various modifications or deformations that can be made by those skilled in the art without creative labor are still within the protection scope of the present invention.

Claims

1. A lifting printing platform mechanism, characterized in that It includes a support plate for fixing to the bottom horizontal beam of the frame. At both ends of the front side of the support plate, there are screw-lifting mechanisms, and at the middle position of the rear side of the support plate, there is a screw-lifting mechanism. The three screw-lifting mechanisms all include a rotational driving member fixed to the support plate. The output shaft of the rotational driving member is connected to the bottom end of the screw. The screw is connected with a screw slider, and the screw slider is slidably connected to the slide rail. The bottom end of the slide rail is fixed to the support plate. The axes of the slide rails and screws of the two screw-lifting mechanisms on the first side are located in the same first plane parallel to the first side edge. The axes of the screw and slide rail of the screw-lifting mechanism at the middle position of the second side are located in a second plane passing through the middle of the first plane and perpendicular to the first plane. The screw sliders of the three screw-lifting mechanisms are connected to the printing platform.

2. The lifting printing platform mechanism according to claim 1, wherein There are rotational driving member fixing holes on the support plate. The rotational driving member is arranged below the support plate, its housing is fixed in the rotational driving member fixing holes, and its output shaft is connected to the bottom end of the screw through a coupling.

3. The lifting printing platform mechanism according to claim 1, wherein, There are also wire-passing holes and heat dissipation holes on the support plate.

4. A lifting printing platform mechanism according to claim 1, characterized in that, The printing platform includes a support bottom plate. The support bottom plate is connected to the bottom ends of multiple isolation columns. The top ends of the multiple isolation columns are connected to the heated bed. A soft magnetic sticker is laid on the heated bed, and a PEI texture plate is adsorbed and fixed on the upper surface of the soft magnetic sticker.

5. The lifting printing platform mechanism according to claim 1, wherein There are two L-shaped limit blocks at the rear end of the support bottom plate, and the limit blocks respectively match the end corners of the rear edge of the PEI texture plate.

6. A 3D printing device, comprising a frame, characterized in that, At the bottom of the frame, there is the lifting printing platform mechanism according to any one of claims 1-5. At the top of the frame, there is a horizontal two-axis linkage mechanism. The horizontal two-axis linkage mechanism is connected to the print head mechanism, and the print head mechanism is connected to the extrusion mechanism fixed to the top of the frame.

7. The 3D printing device according to claim 6, wherein, The print head mechanism includes a print head assembly. The print head assembly is connected to the horizontal two-axis linkage mechanism through a fixing member. There is a first blower on the top of the print head assembly. A flow guide cover fixed to the fixing member is arranged on the outer periphery of the bottom of the print head assembly, and a second blower fixed to the fixing member is arranged behind the flow guide cover.

8. A 3D printing device according to claim 6, characterized in that, The horizontal two-axis linkage mechanism includes an X-direction slide rail. The two ends of the X-direction slide rail are respectively slidably connected to the first Y-direction slide rail and the second Y-direction slide rail. The print head mechanism is slidably connected to the X-direction slide rail. The print head assembly is connected to the first synchronous belt mechanism. The first synchronous belt mechanism can drive the print head assembly to move along the X-direction slide rail. The X-direction slide rail is connected to the second synchronous belt mechanism. The second synchronous belt mechanism can drive the X-direction slide rail to move along the first Y-direction slide rail and the second Y-direction slide rail.

9. A 3D printing device according to claim 8, wherein, The first synchronous belt mechanism includes a first synchronous belt. One end of the first synchronous belt is fixed to the first fixing component on the back of the print head mechanism. The first synchronous belt sequentially bypasses the first reversing wheel at one end of the X-direction slide rail, the first tensioning wheel at the front end of the first Y-direction slide rail, the second reversing wheel at the rear end of the first Y-direction slide rail, the first driving wheel, the third reversing wheel at the rear end of the first Y-direction slide rail, the fourth reversing wheel at the rear end of the second Y-direction slide rail, and the fifth reversing wheel at the other end of the X-direction slide rail, and then the other end is fixed to the second fixing component on the back of the print head mechanism. The first driving wheel is connected to the first driving member fixed to the first Y-direction slide rail.

10. A 3D printing device according to claim 8, characterized in that, The second synchronous belt mechanism includes a second synchronous belt. One end of the second synchronous belt is fixed to a first fixing component on the back of the print head mechanism. The second synchronous belt sequentially bypasses a sixth reversing wheel, a third reversing wheel, a fourth reversing wheel of a sliding member at one end of the X-direction slide rail, a second driving wheel of a second Y-direction slide rail rear support seat, a seventh reversing wheel of the second Y-direction slide rail rear support seat, a second tensioning wheel at the front end of the second Y-direction slide rail, and an eighth reversing wheel of a sliding member at the other end of the X-direction slide rail, and then the other end thereof is fixedly connected to a second fixing component on the back of the print head mechanism. The second driving wheel is connected to a second driving member fixed to the second Y-direction slide rail.

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