Model fixing device of 3D printer, printing method and 3D printer

Abstract

The embodiment of the application discloses a model fixing device of a stereoscopic printer, a printing method and the stereoscopic printer. The model fixing device comprises a movement mechanism and a pressing mechanism in transmission connection with the movement mechanism. The movement mechanism is used to drive the pressing mechanism to move to a support plate of a 3D model after the support plate is printed on a printing platform of the stereoscopic printer. The pressing mechanism is used to press the support plate on the printing platform. The printing platform stops heating after the support plate is pressed by the pressing mechanism, thereby avoiding the phenomenon of edge warping and falling off of the support plate, and enabling the 3D model to be firmly adhered to the support plate, avoiding the phenomenon of edge warping and falling off of the 3D model. Moreover, the printing platform stops heating after the support plate is pressed by the pressing mechanism, thereby shortening the heating time of the printing platform, reducing the consumption of electric power, and further reducing the cost, which is also beneficial to environmental protection.

Description

Technical Field

[0001] The present application relates to the field of printing equipment, and more particularly to a model fixing device for a 3D printer, a printing method, and a 3D printer. Background Art

[0002] A fused deposition modeling (FDM) printer is a machine that uses a digital model file as a basis and uses adhesive materials such as special wax, powdered metal or plastic to print layer by layer of adhesive materials to create 3D (3D) models.

[0003] During the 3D printing process, when the molten adhesive material extruded by the print head of the 3D printer contacts the printing platform, if the temperature of the printing platform is too low, the printed 3D model will easily warp due to thermal expansion and contraction, thus affecting the printing quality.

[0004] To address this issue, most 3D printers currently add a heating module to the printing platform to maintain a certain temperature. For example, patent application number CN201810356496.4 discloses that the heating module of the printing platform is controlled to operate at the beginning of printing, so that the printing platform must be heated to at least a certain temperature to allow the 3D model to better adhere to the printing platform and avoid warping. However, the heating module of the printing platform is in operation throughout the entire printing process, resulting in a large amount of electricity consumption, which increases costs and is not conducive to environmental protection. Summary of the Invention

[0005] In view of this, the present application provides a model fixing device, a printing method and a 3D printer for a 3D printer to solve the problem that the heating module of the printing platform of the 3D printer is in a working state during the entire printing process, resulting in a large amount of electricity consumption, thereby increasing costs and being detrimental to environmental protection.

[0006] In a first aspect, the present application provides a model fixing device for a 3D printer, comprising a motion mechanism and a pressing mechanism transmission-connected to the motion mechanism;

[0007] The motion mechanism is used to drive the pressing mechanism to move to the support plate after the support plate of the 3D model is printed on the printing platform of the 3D printer;

[0008] The pressing mechanism is used to press the support plate onto the printing platform, so that the printing platform stops heating after the support plate is pressed by the pressing mechanism.

[0009] Optionally, the pressing mechanism comprises a lifting assembly mounted on the moving mechanism, and a pressing assembly connected with the lifting assembly;

[0010] The lifting assembly is configured to drive the pressing assembly to move towards the support plate to make the pressing assembly in a pressing state for clamping the support plate together with the heat bed, or to move away from the support plate to make the pressing assembly in a non-pressing state.

[0011] Optionally, the lifting assembly comprises a lifting driving part and an eccentric rotating part.

[0012] The eccentric rotating part comprises a concentric part and an eccentric part connected with the concentric part, the concentric part is connected with the output shaft of the lifting driving part, and the eccentric part is in transmission connection with the pressing assembly; a connecting rod is arranged on the eccentric part.

[0013] The pressing assembly comprises a pressing strip and a pressing strip connecting piece arranged at the end of the pressing strip.

[0014] A first slot is arranged on the pressing strip connecting piece in a horizontal direction; the connecting rod extends into the first slot, and the connecting rod can slide and rotate in the first slot.

[0015] The eccentric rotating part is an eccentric wheel or a cam.

[0016] Optionally, the lifting assembly further comprises a lifting guide assembly mounted on the moving mechanism.

[0017] The lifting guide assembly comprises a guide rod mounting seat arranged on the moving mechanism, and a guide rod arranged on the guide rod mounting seat; a second slot is arranged on the pressing strip connecting piece in a vertical direction, the guide rod extends into the second slot, and the guide rod can slide in the second slot; a buffer part is arranged on the bottom surface of the pressing strip, and the buffer part is a rubber strip.

[0018] Optionally, the moving mechanism comprises a moving driving assembly, a moving transmission assembly and a guide rail assembly.

[0019] The moving transmission assembly comprises a rack and a gear; the rack is mounted on the side surface of the printing platform, the gear is connected with the output shaft of the moving driving assembly; and the gear is in meshing connection with the rack.

[0020] The guide rail assembly comprises a guide rail and a sliding block; the guide rail is arranged in parallel with the rack, and the sliding block is in sliding connection with the guide rail; the moving driving assembly and the pressing mechanism are both mounted on the sliding block.

[0021] Optionally, the sliding block is provided with a through hole, a sliding bearing is arranged in the through hole, and the guide rail passes through the sliding bearing; the guide rail is an optical axis;

[0022] The guide rail assembly further comprises a sliding block connecting frame fixedly connected with the sliding block; the motion driving assembly comprises a motion driving part and a driving part mounting seat;

[0023] The motion driving part is fixed on the driving part mounting seat, and the driving part mounting seat and the pressing mechanism are fixed on the sliding block connecting frame;

[0024] The motion transmission assembly further comprises a rack mounting seat and a heat insulation connecting piece, the rack is fixed on the rack mounting seat, and the rack mounting seat is fixed on the surface of the printing platform away from the printing surface for printing models through the heat insulation connecting piece; both ends of the guide rail are respectively provided with guide rail mounting seats, and the guide rail is fixed on the rack mounting seat through the guide rail mounting seats;

[0025] The model fixing device is in a group, each group of model fixing devices comprising a pressing assembly, two lifting assemblies and two motion mechanisms, the pressing assembly comprising two opposite ends, each end of the pressing assembly being connected with one lifting assembly, and each lifting assembly being connected with one motion mechanism.

[0026] Optionally, the printing platform comprises a heating part, a base plate, a suction accessory and a flexible plate; the heating part is connected with a first surface of the base plate, the suction accessory is connected with a second surface of the base plate, the first surface and the second surface are opposite, and the flexible plate is suction-connected with the suction accessory;

[0027] The rack mounting seat corresponding to the pressing strip connecting piece at one end of the pressing strip is fixed on one side of the base plate, and the rack mounting seat corresponding to the pressing strip connecting piece at the other end of the pressing strip is fixed on the other side of the base plate.

[0028] Optionally, the suction accessory is a magnetic sticker, the flexible plate is an elastic metal plate, the base plate is an aluminum base plate, and the heating part is a heating film.

[0029] The suction accessory is a magnetic sticker, the flexible plate is an elastic metal plate, the base plate is a metal base plate, and the heating part is a heating film.

[0030] In a second aspect, the application provides a printing method of a stereoscopic printer, comprising:

[0031] Controlling the printing platform of the stereoscopic printer to heat;

[0032] Controlling the printing head of the stereoscopic printer to print a support plate on the printing platform;

[0033] After the support plate is printed, a movement mechanism of a model fixing device of the stereoscopic printer is controlled to drive a pressing mechanism to move to the support plate;

[0034] The pressing mechanism of the model fixing device of the stereoscopic printer is controlled to press the support plate on the printing platform;

[0035] The printing platform is controlled to stop heating;

[0036] The printing head is controlled to print the 3D model on the support plate.

[0037] In a third aspect, the present application provides a stereoscopic printer comprising the model fixing device.

[0038] According to the model fixing device of the stereoscopic printer, the printing method and the stereoscopic printer provided in the embodiments of the present application, after the support plate of the 3D model is printed on the printing platform of the stereoscopic printer, the movement mechanism is used to drive the pressing mechanism to move to the support plate, and then the pressing mechanism is used to press the support plate on the printing platform, so that the phenomenon of warping and falling off of the support plate is avoided, and then the 3D model is printed on the support plate, so that the 3D model can be firmly adhered to the support plate, and the phenomenon of warping and falling off of the 3D model is avoided; and the printing platform is controlled to stop heating after the support plate is pressed by the pressing mechanism, so that the heating time of the printing platform is shortened, the consumption of electric power is reduced, and the cost is further reduced, which is also beneficial to environmental protection. BRIEF DESCRIPTION OF DRAWINGS

[0039] The following drawings of the present application are hereby incorporated as part of the present application for understanding the embodiments of the present application. The embodiments of the present application and their descriptions shown in the drawings are used to explain the principles of the present application.

[0040] In the drawings:

[0041] Figure 1 It is a whole structure diagram of the model fixing device of the stereoscopic printer according to an optional embodiment of the present application;

[0042] Figure 2 It is an exploded view of Figure 1

[0043] Figure 3 It is a structure diagram of the lifting guide assembly in Figure 1

[0044] Figure 4 It is a structure diagram of the eccentric rotating part in Figure 1

[0045] Figure 5 It is an application scenario diagram of the model fixing device of the stereoscopic printer according to an optional embodiment of the present application; ​​​

[0046] Figure 6 is an exploded view of the 3D printer according to an embodiment of the present application; Figure 5

[0047] Figure 7 is a state diagram of the compacting mechanism according to an embodiment of the present application;

[0048] Figure 8 is a state diagram of the compacting mechanism compacting the support plate according to an embodiment of the present application;

[0049] Figure 9 is a structural diagram of the 3D printer according to an embodiment of the present application;

[0050] Figure 10 is a partial exploded view of the 3D printer according to an embodiment of the present application. Figure 9

[0051] BRIEF DESCRIPTION OF THE DRAWINGS

[0052] 1 - movement mechanism, 101 - movement transmission assembly, 1011 - rack, 1012 - rack mounting seat, 1013 - heat insulation connecting piece, 1014 - gear, 102 - guide rail assembly, 1021 - guide rail, 1022 - guide rail mounting seat, 1023 - sliding bearing, 1024 - sliding block, 1025 - sliding block connecting frame, 103 - movement driving assembly, 1031 - movement driving part, 1032 - driving part mounting seat, 2 - compacting mechanism, 201 - compacting assembly, 2011 - compacting strip, 2012 - compacting strip connecting piece, 2013 - second slot, 2014 - first slot, 2015 - buffer part, 202 - lifting assembly, 2021 - lifting driving part, 2022 - lifting guide assembly, 20221 - guide rod, 20222 - guide rod mounting seat, 2023 - connecting rod, 2024 - eccentric rotating part, 20241 - concentric part, 20242 - eccentric part, 3 - printing platform, 301 - heating part, 302 - base plate, 303 - suction accessory, 304 - flexible plate, 4 - support plate, 5 - 3D model, 6 - first inclined rack, 7 - second inclined rack, 8 - third inclined rack, 9 - first gantry, 10 - second gantry, 11 - third gantry, 12 - first printing head, 13 - second printing head, 14 - third printing head, 15 - platform base assembly, 1501 - base frame, 1502 - end cover, 1503 - rubber pad, 1504 - T-shaped nut, 1505 - mainboard box, 1506 - boat-shaped switch, 1507 - sealing strip, 1508 - first power supply fixing piece, 1509 - second power supply fixing piece, 1510 - switching power supply, 1511 - support part, 1512 - tensioner, 1513 - conveying belt, 1514 - motor fixing seat, 1515 - driving motor, 1516 - wire clamp, 1517 - platform support, 1518 - brush, 16 - three-color model, 17 - control screen assembly.​​ DETAILED DESCRIPTION

[0053] In the following description, numerous specific details are set forth to provide a more thorough understanding of the present application. However, it will be apparent to one of ordinary skill in the art that the present application can be practiced without incorporating each of these specific details and that the scope of the present application is not intended to be limited to the particular embodiments presented by way of example.

[0054] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0055] In accordance with the present application, example embodiments will now be described in greater detail. These example embodiments, however, can be implemented in various forms and should not be construed to be limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that this disclosure will be complete and full, and will fully convey the concept of the example embodiments to those skilled in the art.

[0056] In a first aspect, as shown in Figure 1 and Figure 4 The present application provides a model fixing device of a stereoscopic printer, including a moving mechanism 1 and a pressing mechanism 2 in transmission connection with the moving mechanism 1; wherein the moving mechanism 1 is used to drive the pressing mechanism 2 to move to the support plate 4 of the 3D model 5 after printing the support plate 4 of the 3D model 5 on the printing platform 3 of the stereoscopic printer; the pressing mechanism 2 is used to press the support plate 4 on the printing platform 3, so that the printing platform 3 stops heating after the support plate 4 is pressed by the pressing mechanism 2.

[0057] The support plate 4 of the 3D model 5, also known as the bottom raft, is a thin plate used to carry the printed 3D model 5, that is, the 3D model 5 is printed on the support plate 4. The shape of the support plate 4 is not strictly limited in the present application. In some implementations, the support plate 4 is rectangular or square, so as to simplify the printing operation of the support plate 4; in some implementations, the support plate 4 can also be part of the 3D model itself.

[0058] Specifically, the working process of the stereoscopic printer provided with the model fixing device is as follows: first, the control device of the stereoscopic printer controls the printing platform 3 to heat, and then controls the printing head to print the support plate 4 on the printing platform 3, so that the printing platform 3 is always at a high temperature during the printing of the support plate 4, thereby preventing the support plate 4 from being warped during printing. Figure 8 As shown in the drawings, after the printing of the support plate 4 is completed, the control device controls the movement mechanism 1 of the model fixing device of the stereoscopic printer to drive the pressing mechanism 2 to move to the support plate 4, and then controls the pressing mechanism 2 of the model fixing device of the stereoscopic printer to press the support plate 4 on the printing platform 3, thereby preventing the support plate 4 from being warped and falling off, and then the control device controls the printing platform 3 to stop heating, and controls the printing head to print the 3D model 5 on the support plate 4, thereby shortening the heating time of the printing platform 3, reducing the consumption of power, and further reducing the cost, which is also conducive to environmental protection, and can make the 3D model 5 firmly adhere to the support plate 4, thereby preventing the 3D model 5 from being warped. Figure 7 As shown in the drawings, the control device controls the movement mechanism 1 to drive the pressing mechanism 2 to move away from the support plate 4, so that the staff can take down the support plate 4 and the 3D model 5. During the fixing of the 3D model 5, the printing head can continue to print.

[0059] Further, in specific applications, the movement mechanism 1 is used to drive the pressing mechanism 2 to move to the edge of the support plate 4 after the support plate 4 of the 3D model 5 is printed on the printing platform 3 of the stereoscopic printer, and then the pressing mechanism 2 is used to apply a pressing force to the edge of the support plate 4, thereby pressing the support plate 4 on the printing platform 3, which can not only achieve the effect of pressing, but also avoid the interference of the pressing mechanism 2 with the subsequent printing of the 3D model 5, so that the printing operation of the 3D model 5 can be carried out smoothly.

[0060] Specifically, as shown in the drawings, Figure 1 and Figure 2 the pressing mechanism 2 comprises a lifting assembly 202 installed on the movement mechanism 1 and a pressing assembly 201 connected with the lifting assembly 202; wherein the lifting assembly 202 is used to drive the pressing assembly 201 to move towards the support plate 4, so that the pressing assembly 201 is in a pressing state of clamping the support plate 4 together with the printing platform 3; or drive the pressing assembly 201 to move away from the support plate 4, so that the pressing assembly 201 is in a non-pressing state.

[0061] The pressing assembly 201 is driven by the lifting assembly 202 to move up and down, so that the pressing assembly 201 can move towards the support plate 4 (i.e. the pressing assembly 201 moves downward) to press the support plate 4 together with the printing platform 3, or move away from the support plate 4 (i.e. the pressing assembly 201 moves upward) to release the pressing state of the pressing assembly 201.

[0062] In this embodiment, the lifting assembly 202 is used to realize the pressing state and the release of the pressing state of the pressing assembly 201, which is simple in structure, easy to realize, and has good pressing effect.

[0063] Further, as shown in Figure 1 , Figure 2 and Figure 4 , the lifting assembly 202 includes a lifting driving part 2021 and an eccentric rotating part 2024; the eccentric rotating part 2024 includes a concentric part 20241 and an eccentric part 20242 connected with the concentric part 20241, the concentric part 20241 is connected with the output shaft of the lifting driving part 2021, and the eccentric part 20242 is in transmission connection with the pressing assembly 201.

[0064] The lifting driving part 2021 can be a motor or other existing component that can provide driving force.

[0065] Before the movement mechanism 1 drives the pressing mechanism 2 to move to the support plate 4, the pressing assembly 201 is not in the pressing state, i.e. the eccentric part 20242 of the eccentric rotating part 2024 is located above the concentric part 20241, so that the pressing assembly 201 is lifted to be not in the pressing state. After the support plate 4 is printed and the movement mechanism 1 drives the pressing mechanism 2 to move to the support plate 4, the lifting driving part 2021 drives the eccentric part 20242 of the eccentric rotating part 2024 to rotate a preset angle towards the printing platform 3 through the concentric part 20241 of the eccentric rotating part 2024, so as to drive the pressing assembly 201 to move downward by a certain distance, thereby completing the pressing operation of the pressing assembly 201 on the support plate 4. After the 3D model 5 on the support plate 4 is printed, the lifting driving part 2021 drives the eccentric part 20242 of the eccentric rotating part 2024 to rotate a preset angle away from the printing platform 3 through the concentric part 20241 of the eccentric rotating part 2024, so as to drive the pressing assembly 201 to move upward by a certain distance, thereby completing the release operation of the pressing assembly 201 on the support plate 4.

[0066] In specific applications, the preset angle is related to the specific structure of the clamping mechanism 2. In some implementations, the preset angle is 90°, which means that the eccentric portion 20242 rotates from a vertical direction to a horizontal direction, or from a horizontal direction to a vertical direction. This facilitates control and enables the clamping assembly 201 to generate sufficient clamping force on the support plate 4, while also preventing damage to the support plate 4 caused by excessive clamping force. In this embodiment, the eccentric rotating portion 2024 converts the circular motion of the eccentric rotating portion 2024 into the lifting motion of the clamping assembly 201, thereby reducing the number of components of the lifting assembly 202, simplifying the structure of the lifting assembly 202, making the structure of the lifting assembly 202 more compact, and increasing the reliability of the lifting assembly 202.

[0067] Furthermore, the eccentric rotating part 2024 is an eccentric wheel or a cam.

[0068] The eccentric wheel has the advantages of simple structure, high reliability, small size and light weight. Compared with the eccentric wheel, the cam is easier to process and manufacture.

[0069] Specifically, if Figure 1 and Figure 2 As shown, a connecting rod 2023 is provided on the eccentric portion 20242; the clamping assembly 201 includes a pressure strip 2011 and a pressure strip connector 2012 arranged at the end of the pressure strip 2011; a first slot 2014 arranged in the horizontal direction is provided on the pressure strip connector 2012; the connecting rod 2023 extends into the first slot 2014, and the connecting rod 2023 can slide and rotate in the first slot 2014.

[0070] The beading connector 2012 can be a rectangular or square sheet structure, which is simple in structure and easy to process. The beading connector 2012 and the beading 2011 can be welded together, or integrally formed, or threadedly connected. This embodiment does not strictly limit the connection method.

[0071] By utilizing the horizontally arranged first slot 2014, the connecting rod 2023 on the eccentric portion 20242 cannot move up and down on the first slot 2014, so that the connecting rod 2023 on the core portion can drive the pressure strip connector 2012 to move up and down, and thus drive the pressure strip 2011 to move up and down, so as to achieve the purpose of the clamping component 201 clamping the support plate 4, or loosening the support plate 4.

[0072] In this embodiment, the eccentric portion 20242 can drive the pressure strip 2011 to move up and down by cooperating with the connecting rod 2023 and the first slot 2014. The structure is simple and compact, easy to implement, and has high transmission reliability and is not prone to failure.

[0073] Specifically, if Figure 1 、Figure 2 and Figure 3 As shown, the lifting assembly 202 also includes a lifting guide assembly 202 installed on the moving mechanism 1; the lifting guide assembly 202 includes a guide rod mounting seat 20222 set on the moving mechanism 1, and a guide rod 20221 set on the guide rod mounting seat 20222; a second slot 2013 set in the vertical direction is provided on the pressure strip connecting member 2012, the guide rod 20221 extends into the second slot 2013, and the guide rod 20221 can slide along the second slot 2013.

[0074] The vertically arranged second slot 2013 prevents the guide rod 20221 from generating horizontal movement within the second slot 2013. In other words, the guide rod 20221 and the second slot 2013 cannot generate relative horizontal movement. This prevents the bead connector 2012 from moving horizontally during the lifting process through the cooperation between the guide rod 20221 and the second slot 2013. In other words, the bead 2011 cannot move horizontally during the lifting process, thereby improving the reliability and smoothness of the lifting movement of the bead 2011. The guide rod 20221 includes two opposing parallel sides to limit the rotation of the bead connector 2012, so that the bead connector 2012 can only move up and down, but cannot move left and right or rotate relative to the guide rod 20221.

[0075] Further, if Figure 2 As shown, a buffer component 2015 is further provided on the bottom surface of the pressure strip 2011, and the buffer component 2015 is a rubber strip.

[0076] The bottom surface of the pressure bar 2011 is the surface facing the printing platform 3. The buffer component 2015 can buffer the impact force of the pressure bar 2011 on the support plate 4, thereby preventing the pressure bar 2011 from having too much impact on the support plate 4 and causing damage to the support plate 4.

[0077] The buffer component 2015 may be made of a rubber strip, which has the advantages of being chemically stable and resistant to high temperatures, thereby increasing the service life of the buffer component 2015 .

[0078] Further, if Figure 1 and Figure 2As shown, the motion mechanism 1 includes a motion drive component 103, a motion transmission component 101 and a guide rail component 102; the motion transmission component 101 includes a rack 1011 and a gear 1014; the rack 1011 is installed on the side of the printing platform 3, and the gear 1014 is connected to the output shaft of the motion drive component 103; the gear 1014 is engaged with the rack 1011; the guide rail component 102 includes a guide rail 1021 and a slider 1024; the guide rail 1021 is arranged parallel to the rack 1011, and the slider 1024 is slidably connected to the guide rail 1021; the motion drive component 103 and the clamping mechanism 2 are both installed on the slider 1024.

[0079] The motion drive assembly 103 drives the gear 1014 to rotate on the rack 1011, thereby enabling the gear 1014 to move on the rack 1011. Furthermore, the motion drive assembly 103 controls the rotation direction of the gear 1014, thereby controlling the movement direction of the gear 1014 on the rack 1011, thereby enabling the gear 1014 to perform linear reciprocating motion on the rack 1011. As the gear 1014 moves on the rack 1011, the motion drive assembly 103 connected to the gear 1014 also moves, thereby driving the slider 1024 to move on the guide rail 1021. The movement of the slider 1024 drives the lifting assembly 202 of the clamping mechanism 2 fixed to the slider 1024 to move simultaneously, thereby causing the clamping assembly 201, which is transmission-connected to the lifting assembly 202, to move.

[0080] Specifically, after the printing of the support plate 4 is completed, the motion drive assembly 103 drives the gear 1014 on the rack 1011 to move toward the edge of the support plate 4, thereby driving the lifting assembly 202 and the pressing assembly 201 on the slider 1024 to move toward the edge of the support plate 4 through the motion drive assembly 103 connected to the gear 1014 and the slider 1024, until the pressing assembly 201 reaches the edge of the support plate 4, and the motion drive assembly 103 stops working. After the printing of the 3D model 5 is completed, the motion drive assembly 103 drives the gear 1014 on the rack 1011 to move away from the support plate 4, thereby driving the lifting assembly 202 and the pressing assembly 201 on the slider 1024 to move away from the support plate 4 through the motion drive assembly 103 connected to the gear 1014 and the slider 1024, until the pressing assembly 201 is a certain distance away from the support plate 4, and the motion drive assembly 103 stops working.

[0081] In this embodiment, transmission is achieved through the cooperation of the rack 1011 and the gear 1014, which can improve the transmission accuracy and achieve the purpose of accurately controlling the movement of the clamping assembly 201.

[0082] Further, if Figure 1 andFigure 2 As shown, the sliding block 1024 is provided with a through hole, and a sliding bearing 1023 is arranged in the through hole, and the guide rail 1021 passes through the sliding bearing 1023; the guide rail 1021 is an optical axis; the guide rail assembly 102 further comprises a sliding block connecting frame 1025 fixedly connected with the sliding block 1024; the movement driving assembly 103 comprises a movement driving part 1031 and a driving part mounting seat 1032; the movement driving part 1031 is fixed on the driving part mounting seat 1032, and the driving part mounting seat 1032 and the pressing mechanism 2 are both fixed on the sliding block connecting frame 1025.

[0083] Through cooperation of the guide rail 1021 and the sliding bearing 1023 in the sliding block 1024, the sliding block 1024 can slide more smoothly, and the phenomenon of shaking can be avoided, so that the lifting assembly 202 and the pressing assembly 201 on the sliding block 1024 can move more smoothly and stably.

[0084] The optical axis has good corrosion resistance and wear resistance, so that the service life of the guide rail 1021 can be improved.

[0085] The movement driving part 1031 can be a component such as a motor that can provide driving force. The connection modes between the movement driving part 1031 and the driving part mounting seat 1032, between the sliding block 1024 and the sliding block connecting frame 1025, and between the sliding block connecting frame 1025 and the driving part mounting seat 1032 and the pressing mechanism 2 can be bolt connection, rivet connection, clamping connection, etc., and the present embodiment is not strictly limited.

[0086] In the present embodiment, the movement driving part 1031 is mounted on the driving part mounting seat 1032, and then the driving part mounting seat 1032 is fixed on the sliding block connecting frame 1025 connected with the sliding block 1024, so as to realize fixed connection of the movement driving part 1031 and the sliding block 1024, and make the connection more stable and reliable. In addition, the sliding block connecting frame 1025 is also fixedly connected with the pressing mechanism 2, so that additional connection components are saved, and the connection structure is further simplified.

[0087] Further, as shown in Figs. 1 and 2, Figure 1 and Figure 2 As shown, the movement transmission assembly 101 further comprises a rack mounting seat 1012 and a heat insulation connecting piece 1013, the rack 1011 is fixed on the rack mounting seat 1012, and the rack mounting seat 1012 is fixed on the surface of the printing platform 3 away from the printing surface for printing models through the heat insulation connecting piece 1013; the guide rail 1021 is provided with a guide rail mounting seat 1022 at each end, and the guide rail 1021 is fixed on the rack mounting seat 1012 through the guide rail mounting seat 1022.

[0088] Among them, the thermal insulation connector 1013 is used to connect the thermal insulation pad column. The rack mounting base 1012 is fixed to the surface of the printing platform 3 away from the printing surface for printing the model through the thermal insulation connector 1013. The thermal insulation connector 1013 not only serves as a connection and fixation function, but also provides a thermal insulation function, thereby preventing the heat generated by the printing platform 3 when heated from being transferred to the rack mounting base 1012, thereby preventing the high temperature from affecting the rack 1011 on the rack mounting base 1012 and improving the service life. In addition, the guide rail 1021 is fixed to the rack mounting base 1012 through the guide rail mounting base 1022, forming a whole, and the structure is more compact.

[0089] Further, if Figure 4 and Figure 5 As shown, the model fixing device is in groups, and each group of model fixing devices includes a clamping component 201, two lifting components 202 and two motion mechanisms 1. The clamping component 201 includes two opposite ends, each end of the clamping component 201 is connected to a lifting component 202, and each lifting component 202 is connected to a motion mechanism 1.

[0090] Each end of the clamping assembly 201 is respectively provided with a lifting assembly 202 and a motion mechanism 1, so that the two ends of the clamping assembly can achieve synchronous movement and lifting motion, thereby making the control of each clamping assembly 201 more accurate, and also making the clamping assembly 201 produce the same clamping force on the support plate 4, so that the pressure on one side of the support plate 4 is more uniform and the fit with the printing platform 3 is better.

[0091] In a specific application, the model fixing device is set to two groups, one group is used to press the first side of the support plate 4, and the other group is used to press the second side of the support plate 4 opposite to the first side, thereby pressing the edges of the support plate 4 on both sides, so that the opposite sides of the support plate 4 produce the same pressing force, thereby making the pressure on the support plate 4 more uniform, and improving the overall fit between the support plate 4 and the printing platform 3.

[0092] Specifically, if Figure 5 and Figure 6 As shown, the printing platform 3 includes a heating part 301, a substrate 302, an adsorption part 303 and a flexible plate 304; the heating part 301 is connected to the first surface of the substrate 302, the adsorption part 303 is connected to the second surface of the substrate 302, the first surface and the second surface are opposite to each other, and the flexible plate 304 is adsorbed and connected to the adsorption part 303.

[0093] A heating unit 301 disposed beneath the substrate 302 generates heat, thereby heating the printing platform 3. The heat generated by the heating unit 301 is quickly transferred to the flexible board 304 via the substrate 302, thereby preventing warping during the printing of the support plate 4 of the 3D model 5. After the model is printed, the flexible board 304 is bent by an external force, facilitating the removal of the support plate 4 and the 3D model 5. Furthermore, the flexible board 304 is attached to the second surface of the substrate 302 via an adsorption member 303, enabling rapid assembly of the flexible board 304 and the substrate 302.

[0094] The rack mounting seat 1012 corresponding to the beading connector 2012 at one end of the two beadings 2011 is fixed on one side of the base plate 302 , and the rack mounting seat 1012 corresponding to the beading connector 2012 at the other end of the two beadings 2011 is fixed on the other side of the base plate 302 .

[0095] The rack mounting base 1012 and the base plate 302 can be connected by bolts, rivets, or other means, which are not strictly limited in this embodiment. By directly securing the rack mounting base 1012 to the base plate 302, the additional structure for securing the model fixture can be eliminated, thereby reducing the number of components and simplifying the structure. Furthermore, the model fixture and the printing platform 3 are integrated into a more compact structure.

[0096] Furthermore, the adsorption component 303 is a magnetic sticker, the flexible plate 304 is an elastic metal plate, the substrate 302 is an aluminum substrate, and the heating part 301 is a heating film.

[0097] The flexible plate 304 is a thin sheet made of metal, such as steel or iron. It exhibits elastic deformation properties, meaning it bends when subjected to an external force and returns to its original shape when the force is removed. When the flexible plate 304 is placed on the substrate 302, the magnetic sticker attracts the flexible metal plate to the second surface of the aluminum substrate 302.

[0098] The aluminum substrate has good thermal conductivity and corrosion resistance, thereby improving the heat conduction efficiency and service life of the substrate 302 . In addition, the aluminum substrate is light in weight, thereby also reducing the weight of the substrate 302 .

[0099] The heating film can be bonded to the first surface of the substrate 302 through the insulating heating layer, so that the connection between the heating film and the substrate 302 is more stable, and the insulating adhesive layer also plays an insulating role, so that the heating film can work normally.

[0100] In other implementations, the present application also provides a model fixing device for a 3D printer, comprising a motion mechanism 1 and a pressing mechanism 2 connected to the motion mechanism 1;

[0101] The movement mechanism 1 is used to drive the pressing mechanism 2 to move to the support plate 4 after printing the support plate 4 of the 3D model 5 on the printing platform 3 of the stereoscopic printer.

[0102] The pressing mechanism 2 is used to press the support plate 4 on the printing platform 3, so that the printing platform 3 stops heating after the support plate 4 is pressed by the pressing mechanism 2.

[0103] The pressing mechanism 2 comprises a lifting assembly 202 installed on the movement mechanism 1 and a pressing assembly 201 connected with the lifting assembly 202.

[0104] The lifting assembly 202 is used to drive the pressing assembly 201 to move towards the support plate 4, so that the pressing assembly 201 is in a pressing state of clamping the support plate 4 together with the printing platform 3; or drive the pressing assembly 201 to move away from the support plate 4, so that the pressing assembly 201 is in a non-pressing state.

[0105] The lifting assembly 202 comprises a lifting driving part 2021 and an eccentric rotating part 2024.

[0106] The eccentric rotating part 2024 comprises a concentric part 20241 and an eccentric part 20242 connected with the concentric part 20241, the concentric part 20241 is connected with the output shaft of the lifting driving part 2021, and the eccentric part 20242 is in transmission connection with the pressing assembly 201; the eccentric part 20242 is provided with a connecting rod 2023.

[0107] The pressing assembly 201 comprises a pressing strip 2011 and a pressing strip connecting piece 2012 arranged at the end of the pressing strip 2011.

[0108] The pressing strip connecting piece 2012 is provided with a first slot 2014 arranged in the horizontal direction; the connecting rod 2023 extends into the first slot 2014, and the connecting rod 2023 can slide and rotate in the first slot 2014.

[0109] The eccentric rotating part 2024 is an eccentric wheel or a cam.

[0110] The lifting assembly 202 further comprises a lifting guide assembly 2022 installed on the movement mechanism 1.

[0111] The lifting guide assembly 2022 comprises a guide rod mounting seat 20222 arranged on the movement mechanism 1, and a guide rod 20221 arranged on the guide rod mounting seat 20222; the pressing strip connecting piece 2012 is provided with a second slot 2013 arranged in the vertical direction, the guide rod 20221 extends into the second slot 2013, and the guide rod 20221 can slide in the second slot 2013.

[0112] The bottom surface of the pressing strip 2011 is further provided with a buffer component 2015 which is a rubber strip.

[0113] The movement mechanism 1 comprises a movement driving assembly 103, a movement transmission assembly 101 and a guide rail assembly 1021.

[0114] The movement transmission assembly 101 comprises a rack 1011 and a gear 1014; the rack 1011 is arranged on the side surface of the printing platform 3, the gear 1014 is connected with the output shaft of the movement driving assembly 103; the gear 1014 is engaged with the rack 1011.

[0115] The guide rail assembly 1021 comprises a guide rail 1021 and a sliding block 1024; the guide rail 1021 is arranged in parallel with the rack 1011, the sliding block 1024 is in sliding connection with the guide rail 1021; the movement driving assembly 103 and the pressing mechanism 2 are both arranged on the sliding block 1024.

[0116] The sliding block 1024 is provided with a through hole, a sliding bearing 1023 is arranged in the through hole, and the guide rail 1021 passes through the sliding bearing 1023; the guide rail 1021 is an optical axis.

[0117] The guide rail assembly 1021 further comprises a sliding block connecting frame 1025 fixedly connected with the sliding block 1024; the movement driving assembly 103 comprises a movement driving part 1031 and a driving part mounting seat 1032.

[0118] The movement driving part 1031 is fixed on the driving part mounting seat 1032, and the driving part mounting seat 1032 and the pressing mechanism 2 are both fixed on the sliding block connecting frame 1025.

[0119] The motion transmission assembly 101 further comprises a rack mounting seat 1012 and a heat insulation connecting piece 1013, the rack 1011 is fixed on the rack mounting seat 1012, and the rack mounting seat 1012 is fixed on the surface of the printing platform 3 away from the printing surface for printing the model through the heat insulation connecting piece 1013; both ends of the guide rail 1021 are respectively provided with a guide rail mounting seat 1022, and the guide rail 1021 is fixed on the rack mounting seat 1012 through the guide rail mounting seat 1022.

[0120] The model fixing device is in a group, each group of model fixing devices comprising one pressing assembly 201, two lifting assemblies 202 and two motion mechanisms 1, the pressing assembly 201 comprising two opposite ends, each end of the pressing assembly 201 being connected with the one lifting assembly 202 respectively, and each lifting assembly 202 being connected with the motion mechanism 1.

[0121] The printing platform 3 comprises a heating part 301, a base plate 302, a suction accessory 303 and a flexible plate 304; the heating part 301 is connected with a first surface of the base plate 302, the suction accessory 303 is connected with a second surface of the base plate 302, the first surface and the second surface are opposite, and the flexible plate 304 is connected with the suction accessory 303 in a suction manner.

[0122] The rack connecting piece 2012 at one end of the pressing strip 2011 is fixed on one side of the base plate 302, and the rack connecting piece 2012 at the other end of the pressing strip 2011 is fixed on the other side of the base plate 302.

[0123] The suction accessory 303 is a magnetic sticker, the flexible plate 304 is an elastic metal plate, the base plate 302 is an aluminum base plate 302, and the heating part 301 is a heating film.

[0124] In a second aspect, the application provides a printing method of a stereoscopic printer, comprising:

[0125] Step S101: controlling the printing platform 3 of the stereoscopic printer to heat.

[0126] Step S102: controlling the printing head of the stereoscopic printer to print the support plate 4 on the printing platform 3.

[0127] Step S103: after the printing of the support plate 4 is completed, controlling the motion mechanism 1 of the model fixing device of the stereoscopic printer to drive the pressing mechanism 2 to move to the support plate 4.

[0128] Step S104: controlling the pressing mechanism 2 of the model fixing device of the stereoscopic printer to press the support plate 4 on the printing platform 3.

[0129] Step S105: controlling the printing platform 3 to stop heating;

[0130] Step S106: controlling the printing head to print the 3D model 5 on the support plate 4.

[0131] It should be understood that the sequence of the steps in the above embodiments does not mean the order of execution, and the execution order of the processes should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0132] It is worth noting that controlling the printing platform 3 to stop heating does not affect the printing progress of the 3D model 5, that is, controlling the printing platform 3 to stop heating can be performed at the same time as controlling the printing head to print the 3D model 5 on the support plate 4, that is, there is no need to wait until the printing platform 3 is controlled to stop heating before controlling the printing head to print the 3D model 5 on the support plate 4, thereby improving the printing efficiency. Wherein, the steps S103 and S104 can also not affect the execution of step S106 when executed.

[0133] The specific structure of the model fixing device of the stereoscopic printer involved in the method can be referred to the above embodiments, which will not be repeated here.

[0134] According to the printing method of the stereoscopic printer provided by the embodiments of the present application, after the support plate 4 of the 3D model 5 is printed on the printing platform 3 of the stereoscopic printer, the pressing mechanism 2 is driven by the movement mechanism 1 to move to the support plate 4, and then the support plate 4 is pressed on the printing platform 3 by the pressing mechanism 2, so as to avoid the phenomenon of edge lifting and falling off of the support plate 4, and then the 3D model 5 is printed on the support plate 4, so as to enable the 3D model 5 to be firmly adhered to the support plate 4, and avoid the phenomenon of edge lifting and falling off of the 3D model 5; and the printing platform 3 stops heating after the support plate 4 is pressed by the pressing mechanism 2, thereby shortening the heating time of the printing platform 3, reducing the consumption of power, and further reducing the cost, which is also conducive to environmental protection.

[0135] In a third aspect, the present application provides a stereoscopic printer comprising the above-mentioned model fixing device.

[0136] The specific structure of the model fixing device of the stereoscopic printer involved in the method can be referred to the above embodiments, which will not be repeated here.

[0137] According to the three-dimensional printer provided by the embodiment of the application, after the support plate 4 of the 3D model 5 is printed on the printing platform 3 of the three-dimensional printer, the pressing mechanism 2 is driven by the movement mechanism 1 to move to the support plate 4, and then the support plate 4 is pressed on the printing platform 3 by the pressing mechanism 2, so that the phenomenon of edge lifting and falling off of the support plate 4 is avoided, and then the 3D model 5 is printed on the support plate 4, so that the 3D model 5 can be firmly adhered to the support plate 4, and the phenomenon of edge lifting and falling off of the 3D model 5 is avoided; and the printing platform 3 stops heating after the support plate 4 is pressed by the pressing mechanism 2, so that the heating time of the printing platform 3 is shortened, the consumption of electric power is reduced, and the cost is further reduced, which is also beneficial to environmental protection.

[0138] In specific applications, as shown in Figure 9 The three-dimensional printer is a three-color three-dimensional printer capable of being replaced, which comprises a platform base assembly 15, a first gantry 9, a second gantry 10 and a third gantry 11 arranged side by side on the platform base, a first print head 12 and a first inclined material rack 6 arranged on the first gantry 9, a second print head 13 and a second inclined material rack 7 arranged on the second gantry 10, a third print head 14 and a third inclined material rack 8 arranged on the third gantry 11, red consumables hung on the first inclined material rack 6, yellow consumables hung on the second inclined material rack 7, and blue consumables hung on the third inclined material rack 8. The gantries are connected as a whole by a profiled material connecting and fixing assembly, so as to improve the rigidity of the gantry. A user can control and select a printing model through a control screen assembly 17 on the three-dimensional printer.

[0139] Among them, as shown in Figure 8As shown, the platform base assembly 15 comprises a base frame 1501, a switching power supply 1510 and a mainboard box 1505; the inner side of the base frame 1501 is provided with a guide groove, and the two sides of the mainboard box 1505 are provided with plug-in components, which are inserted into the guide groove to fix the mainboard box 1505 on the base frame 1501. The switching power supply 1510 is fixed on the base frame 1501 by screws, a first power supply fixing part 1508 and a second power supply fixing part 1509, and the switching power supply 1510 is provided with a boat-shaped switch 1506. The corners of the base frame 1501 are provided with rubber pads 1503, which are fixed at the corresponding corners by T-shaped nuts 1504 and screws, and the rubber pads 1503 play a role in buffering and shock absorption, thereby avoiding the shaking and shaking phenomenon of the entire machine during printing. The end cover 1502 is arranged at the end of the base frame 1501, so as to prevent the edges of the base frame 1501 from causing harm to the workers. The area where the wires are arranged on the platform base is also provided with a sealing strip 1507, so as to seal and protect the wires and prevent foreign matters such as dust from falling on the wires. Further, the three-dimensional printer is also provided with a brush 1518, which is used to brush off the consumables remaining on the nozzle before model printing, so as to avoid the mixing of colors after color changing. The bottom of the base plate 302 is also provided with a wire clip 1516, which is used to tighten the wires, so as to prevent the wires from scratching other parts during printing and causing printing misalignment.

[0140] The base frame 1501 is also provided with a driving motor 1515 arranged along the length direction of the base frame 1501 and in transmission connection with the transfer belt 1513, and the driving motor 1515 is installed on the base frame 1501 by a motor fixing seat 1514. The base plate 302 provided with a heating part is connected with the transfer belt 1513, so that the movement of the base plate 302 can be driven by the motor driving the transfer belt 1513. The base plate 302 is installed with a platform support 1517 and a D-shaped pulley at the bottom, and the D-shaped pulley is in sliding connection with a support part 1511 supporting the transfer belt 1513, so that the movement of the base plate 302 is more stable. Further, the transfer belt 1513 is also provided with a tensioner 1512, which can adjust the tightness of the transfer belt 1513 to improve the printing precision. After the three-color model 16 is cooled after printing, the flexible plate 304 can be easily taken out by bending.

[0141] The three-dimensional printer card adopts the following two ways to print:

[0142] The first way is layered three-color printing: the platform base assembly 15 moves the printing platform 3 to the lower side of the first print head 12, and then the first color (red) printing is performed by the first print head 12; after the printing is completed, the platform base assembly 15 drives the printing platform 3 to move 220 mm to the direction close to the second print head 13, so that the printing platform 3 moves to the lower side of the second print head 13, and then the second color (yellow) printing is performed by the second print head 13 on the red slice layer; after the printing is completed, the platform base assembly 15 drives the printing platform 3 to move 220 mm to the direction close to the third print head 14, so that the printing platform 3 moves to the lower side of the third print head 14, and then the third color (blue) printing is performed by the third print head 14 on the yellow slice layer.

[0143] The second way is same-layer three-color printing: the platform base assembly 15 moves the printing platform 3 to the lower side of the first print head 12, and then the first color (red) printing is performed by the first print head 12 on the slice layer; after the printing is completed, the platform base assembly 15 drives the printing platform 3 to move to the direction close to the second print head 13, so that the printing platform 3 moves to the lower side of the second print head 13, and then the second color (yellow) printing is performed by the second print head 13 on the slice layer; after the printing is completed, the platform base assembly 15 drives the printing platform 3 to move 220 mm to the direction close to the third print head 14, so that the printing platform 3 moves to the lower side of the third print head 14, and then the third color (blue) printing is performed by the third print head 14 on the slice layer.

[0144] The three-color stereoscopic printer is improved on the basis of a single-color printer, has the advantages of easy manufacturing and strong expandability. Moreover, the three print heads share one printing platform and one leveling reference, and are equipped with an automatic leveling module of a proximity switch sensor, realize synchronous automatic leveling, thereby reducing the precision requirement of the installation of the print heads, and avoiding the problem of scratching the model caused by the inconsistent nozzle heights of the three print heads. In addition, the platform base assembly 15 drives the printing platform 3 to move to the print heads of different colors, so as to replace the print heads loaded with different color consumables to achieve the purpose of switching three different color consumables, thereby realizing the functions of same-layer three-color printing and layered three-color printing.

[0145] Further, the three print head heating systems adopt an intelligent linkage control system, which can be independently controlled and can be recognized and controlled according to temperature signal feedback, so that the second print head 13 automatically starts preheating in advance before the first print head 12 is about to complete printing and needs to be replaced with the second color; similarly, the third print head 14 automatically starts preheating in advance before the second print head 13 is about to complete printing and needs to be replaced with the third color. This replacement method saves electric energy, and at the same time, the consumables will not be prematurely heated, melted and flowed out of the nozzle, avoiding the interference and mixing of different color consumables, effectively ensuring the accuracy of the replacement layer and the interlayer connection of the replacement of different color consumables, and the color distinctness of the three-color model 16, greatly meeting the needs and efficiency of users printing the three-color model 16.

[0146] The present application has been described by the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and illustration, and are not intended to limit the present application to the scope of the described embodiments. In addition, those skilled in the art can understand that the present application is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the present application, which all fall within the scope of the present application. The scope of protection of the present application is defined by the attached claims and their equivalent scope.

Claims

1. A model fixing device for a 3D printer, characterized in that: It includes a motion mechanism and a pressing mechanism transmission-connected with the motion mechanism; The motion mechanism is used to drive the pressing mechanism to move to the support plate after the support plate of the 3D model is printed on the printing platform of the 3D printer; The pressing mechanism is used to press the support plate onto the printing platform, so that the printing platform stops heating after the support plate is pressed by the pressing mechanism.

2. The model fixing device of the 3D printer according to claim 1, characterized in that: The pressing mechanism includes a lifting assembly mounted on the motion mechanism, and a pressing assembly connected to the lifting assembly; In which, the lifting assembly is used to drive the clamping assembly to move in the direction close to the support plate so that the clamping assembly is in a clamping state of clamping the support plate together with the printing platform; or drive the clamping assembly to move in the direction away from the support plate so that the clamping assembly releases the clamping state.

3. The model fixing device of the 3D printer according to claim 2, characterized in that: The lifting assembly includes a lifting drive unit and an eccentric rotating unit; The eccentric rotating part includes a concentric part and an eccentric part connected to the concentric part, the concentric part is connected to the output shaft of the lifting drive part, and the eccentric part is in transmission connection with the pressing assembly; a connecting rod is provided on the eccentric part; The pressing assembly includes a pressure strip and a pressure strip connector provided at the end of the pressure strip; The pressure strip connecting member is provided with a first slot arranged in a horizontal direction; the connecting rod extends into the first slot, and the connecting rod can slide and rotate in the first slot; The eccentric rotating part is an eccentric wheel or a cam.

4. The model fixing device of the 3D printer according to claim 3, characterized in that: The lifting assembly further includes a lifting guide assembly mounted on the motion mechanism; The lifting guide assembly includes a guide rod mounting seat provided on the motion mechanism, and a guide rod provided on the guide rod mounting seat; a second slot provided in a vertical direction is provided on the pressure strip connecting member, the guide rod extends into the second slot, and the guide rod is capable of sliding along the second slot; The bottom surface of the pressure strip is further provided with a buffer component, which is a rubber strip.

5. The model fixing device of the 3D printer according to claim 2, characterized in that: The motion mechanism includes a motion drive component, a motion transmission component and a guide rail component; The motion transmission assembly includes a rack and a gear; the rack is installed on the side of the printing platform, and the gear is connected to the output shaft of the motion drive assembly; the gear is meshed with the rack; The guide rail assembly includes a guide rail and a slider; the guide rail is arranged parallel to the rack, and the slider is slidably connected to the guide rail; the motion drive assembly and the clamping mechanism are both installed on the slider.

6. The model fixing device of the 3D printer according to claim 5, characterized in that: The slider is provided with a through hole, a sliding bearing is provided in the through hole, and the guide rail passes through the sliding bearing; the guide rail is an optical axis; The guide rail assembly further comprises a slider connecting frame fixedly connected to the slider; the motion drive assembly comprises a motion drive unit and a drive unit mounting seat; The motion driving part is fixed on the driving part mounting seat, and the driving part mounting seat and the pressing mechanism are both fixed on the slider connecting frame; The motion transmission assembly further includes a rack mounting seat and a heat-insulating connector, the rack being fixed to the rack mounting seat, and the rack mounting seat being fixed to a surface of the printing platform away from the printing surface for printing the model via the heat-insulating connector; guide rail mounting seats are respectively provided at both ends of the guide rail, and the guide rail is fixed to the rack mounting seat via the guide rail mounting seats; The model fixing device is in groups, and each group of model fixing devices includes one clamping component, two lifting components and two motion mechanisms. The clamping component includes two opposite ends, each end of the clamping component is connected to one lifting component, and each lifting component is connected to one motion mechanism.

7. The model fixing device of the 3D printer according to claim 3, characterized in that: The printing platform includes a heating portion, a substrate, an adsorbent, and a flexible plate; the heating portion is connected to a first surface of the substrate, the adsorbent is connected to a second surface of the substrate, the first surface and the second surface are opposite to each other, and the flexible plate is adsorbed and connected to the adsorbent; The rack mounting seat corresponding to the pressure strip connecting piece at one end of the pressure strip is fixed on one side of the base plate, and the rack mounting seat corresponding to the pressure strip connecting piece at the other end of the pressure strip is fixed on the other side of the base plate.

8. The model fixing device of the 3D printer according to claim 7, characterized in that: The adsorption member is a magnetic sticker, the flexible plate is an elastic metal plate, the substrate is an aluminum substrate, and the heating component is a heating film.

9. A printing method for a 3D printer, characterized in that: include: Control the heating of the printing platform of the 3D printer; Controlling the print head of the 3D printer to print a support plate of the model on the printing platform; After the support plate is printed, the motion mechanism of the model fixing device of the 3D printer is controlled to drive the pressing mechanism to move to the support plate; Controlling the pressing mechanism of the model fixing device of the 3D printer to press the support plate onto the printing platform; Controlling the printing platform to stop heating; The print head is controlled to print a 3D model on the support plate.

10. A 3D printer, characterized in that: A model fixing device comprising a 3D printer as described in any one of claims 1 to 8.

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