A 3D printing device suitable for large-sized printed objects

Abstract

This utility model relates to a 3D printing device suitable for large-size printed parts, belonging to the technical field of 3D printing equipment. It includes a support frame, a printing assembly, a track, and a forming platform. The printing assembly includes a bracket and a sand-laying device and an inkjet printing device mounted on the bracket. The support frame has a built-in lifting drive mechanism, whose drive end is connected to the bracket to drive the bracket to move up and down. The track is located below the printing assembly. The forming platform is movably mounted on the track. This utility model replaces the previous gradually descending forming cylinder technology with a technology that controls the printing assembly to rise gradually through a lifting drive mechanism. During the printing process, the forming platform is only responsible for bearing the continuously increasing weight of the material layer. Therefore, the lifting drive mechanism does not experience the situation of continuously increasing force as the printing process progresses, as in traditional technologies. This allows for more precise control of the printing thickness and accuracy. Furthermore, unlike the high requirements of forming cylinder structure manufacturing, it effectively saves manufacturing costs.

Description

Technical Field

[0001] This utility model belongs to the field of 3D printing equipment technology, specifically relating to a 3D printing device suitable for large-size printed parts. Background Technology

[0002] With the increasing demand for 3D printed products, various industrial 3D printing equipment with different molding processes have emerged in the market, such as SLM (Selective Laser Melting), SLS (Selective Laser Sintering), 3DP (Inkjet Sand Printing), and BJM (Inkjet Metal Printing). The basic operating procedure for these devices is to lay the printing material into a forming cylinder, then perform the molding process. After one layer of material is laid, the current layer is printed. Then, the piston plate of the forming cylinder lowers to lay another layer, and so on, until the entire part is printed. Currently, this type of 3D printing equipment has advantages such as high efficiency, flexible production process, and low cost when producing small parts. However, with the increasing size of printed parts and the large-scale production of printed parts, this method of printing by raising and lowering the piston plate of the forming cylinder shows significant shortcomings.

[0003] First, during the printing process, as the object gradually takes shape, the thickness of the material layer on the piston plate of the forming cylinder gradually increases, and the force borne by the piston plate also increases synchronously. This can easily lead to instability of the piston plate during its up-and-down movement, thus affecting the control of the printing thickness and accuracy by the piston plate. This is especially true for large-sized parts, where the force borne by the piston plate is even greater, thus requiring higher precision in the motion control of the piston plate and demanding high-performance, high-load drives. Furthermore, the traditional forming cylinder structure has very high requirements for its manufacturing when printing large-sized parts, ultimately resulting in a relatively complex overall structure and higher manufacturing costs for the 3D printer. Second, during the up-and-down movement of the piston plate, the seals around the piston plate and the cylinder wall wear over a long period of time, making material prone to leakage and causing printing malfunctions.

[0004] Therefore, when designing and manufacturing large-size 3D printers, how to provide a machine structure that is simple, low-cost, and can meet the printing requirements of large-size parts is a problem that technicians need to solve. Utility Model Content

[0005] The purpose of this invention is to provide a 3D printing device suitable for large-size printed parts, aiming to solve the problem of the lack of related equipment in the existing technology.

[0006] To solve the above problems, the present invention adopts the following technical solution:

[0007] A 3D printing device suitable for large-size printed parts, comprising:

[0008] Support frame;

[0009] A printing assembly, comprising a bracket and a sand-spreading device and an inkjet printing device mounted on the bracket, wherein the support frame has a built-in lifting drive mechanism, the drive end of which is connected to the bracket and can drive the bracket to reciprocate along the height direction of the support frame;

[0010] A track, which is positioned below the printing assembly;

[0011] A molding platform is movably mounted on the track, which can be moved to directly below the printing assembly to complete printing and then moved out.

[0012] The beneficial effects of this utility model are as follows: The lifting drive mechanism can move the entire printing assembly along the height of the support frame, allowing it to print layer by layer on the forming platform from bottom to top. This eliminates the need for a forming cylinder to gradually descend and complete the printing process. The forming platform only bears the increasing weight of the material layers throughout the printing process, ensuring stability and robustness. Similarly, the lifting drive mechanism only handles the lifting of the printing assembly. The sand-laying device and inkjet printing device are relatively lightweight, and the sand-laying device continuously feeds and adds material, making the weight change relative to the overall structure negligible. Therefore, the lifting drive mechanism does not experience the continuous increase in stress as printing progresses, as is seen in traditional technologies. This ensures the stability of the printing assembly during lifting, thereby controlling the printing thickness accuracy. Compared with existing technologies, the technical solution adopted in this application better meets the requirements for larger printed parts and a larger print volume. Furthermore, unlike the high requirements of forming cylinder structures, it effectively saves manufacturing costs and reduces manufacturing difficulty.

[0013] Furthermore, the lifting drive mechanism includes a drive motor, a transmission screw, a pulley assembly, and a lifting slider. The drive motor is fixedly mounted on the support frame. The transmission screw is vertically arranged inside the support frame, and its upper and lower ends are rotatably connected to the support frame. The pulley assembly drives the motor shaft of the drive motor and the rod of the transmission screw. The lifting slider is threadedly connected to the rod of the transmission screw and fixedly connected to the bracket.

[0014] Further beneficial effects of this utility model are: the use of a screw-slider system to drive the bracket so that it can move back and forth along the height direction of the support frame together with the lifting slider, and the use of a belt pulley group for transmission can effectively control the transmission ratio to make the bracket obtain a relatively stable movement speed and ensure printing accuracy.

[0015] Furthermore, the sand-laying device includes a movable material cart and a material cart drive mechanism. The material cart has an openable and closable discharge port at its bottom. The material cart drive mechanism is mounted on the bracket, and its drive end is connected to the body of the material cart to drive the material cart to move in a direction parallel to the surface of the forming platform.

[0016] A further beneficial effect of this utility model is that the movable material cart facilitates more uniform material spreading on the molding platform.

[0017] Furthermore, it also includes a feeding device, which includes a new material storage bin, a new material conveying assembly, and a discharge hopper. The discharge hopper is mounted on the bracket and has an openable and closable discharge port below it. The new material conveying assembly connects the new material storage bin and the discharge hopper, and the discharge port is correspondingly connected to the feed inlet at the top of the material cart.

[0018] A further beneficial effect of this utility model is that by setting up a feeding device, sand can be replenished to the material cart, ensuring continuous production.

[0019] Furthermore, the new material conveying assembly includes a positive pressure blower, a conveying pipe, and a separator. The feed end of the positive pressure blower is connected to the interior of the new material storage bin, the inlet end of the conveying pipe is connected to the outlet end of the positive pressure blower, and the outlet end is connected to the discharge hopper through the separator. The separator has holes for gas to escape.

[0020] Further beneficial effects of this utility model are: remote conveying of sand is achieved by using a positive pressure blower and conveying pipe, and the high-pressure gas and sand are separated before entering the material car by a separator.

[0021] Furthermore, it also includes a waste material recycling device, which includes a waste material conveying component and a waste material storage bin. A waste material collection box is fixedly connected to the outer periphery of the molding platform. The waste material collection box has an open top, and its open end is aligned with the upper surface of the molding platform. The waste material conveying component connects the waste material collection box and the waste material storage bin.

[0022] A further beneficial effect of this utility model is that by setting up a waste material recycling device in conjunction with the waste material collection box around the molding platform, the sand material scattered around the molding platform can be recycled, thus preventing the waste of sand material.

[0023] Furthermore, the waste material conveying assembly includes a conveying channel and a spiral conveying shaft rotatably connected within the conveying channel. The inlet end of the conveying channel is connected to the waste material collection box, and the outlet end of the conveying channel is connected to the waste material storage bin.

[0024] A further beneficial effect of this utility model is that the surplus material is gradually transported to the surplus material storage bin through the conveying channel and the spiral conveying shaft within the conveying channel.

[0025] Furthermore, a screen is fixedly connected inside the waste material storage bin.

[0026] A further beneficial effect of this utility model is that by using a sieve to filter the collected residue, some of the lumpy sand can be removed, leaving only the powdery sand that can be reused.

[0027] Furthermore, the forming platform includes a rectangular support plate and a roller assembly rotatably mounted at its lower end. The platform is arranged parallel to the track surface of the track and moves along the track via the roller assembly.

[0028] A further beneficial effect of this utility model is that the roller assembly drives the bearing plate to move on the track, and the parallel arrangement of the bearing plates ensures the stability of the movement.

[0029] Furthermore, there are multiple support frames, and the lifting drive mechanisms within the multiple support frames are synchronously controlled by a PLC.

[0030] A further beneficial effect of this utility model is that by setting multiple support frames and synchronously controlling the lifting drive mechanism, the production needs of larger parts can be met. Attached Figure Description

[0031] Figure 1 A schematic diagram of an overall 3D printing device suitable for large-size printed parts provided by this utility model;

[0032] Figure 2 This is a schematic diagram showing the connection between the bracket, support frame, and lifting drive mechanism.

[0033] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0034] Figure 4 for Figure 2 Enlarged view of point B in the middle;

[0035] Figure 5 A schematic diagram of a material cart;

[0036] Figure 6 This is a schematic diagram of the adhesive spraying section;

[0037] Figure 7 A schematic diagram of the material cart drive mechanism and the adhesive spraying unit drive mechanism;

[0038] Figure 8 This is a schematic diagram of the feeding device;

[0039] Figure 9 for Figure 8 Enlarged view of point C in the middle;

[0040] Figure 10 This is a schematic diagram of the molding platform;

[0041] Figure 11 This is a schematic diagram of the bottom of the molding platform;

[0042] Figure 12 This is a schematic diagram of a waste material recovery device;

[0043] Figure 13 This is a schematic diagram of the installation of four support frames and brackets;

[0044] Figure 14 This is a schematic diagram of the installation of 6 support frames and brackets.

[0045] Figure Labels

[0046] 1. Support frame; 2. Bracket; 3. Sand spreading device; 310. Material cart; 320. Material cart drive mechanism; 321. First linear slide a; 322. First linear slide b; 323. First connecting shaft; 324. First motor; 4. Inkjet printing device; 410. Adhesive spraying unit; 420. Adhesive spraying unit drive mechanism; 421. Second linear slide a; 422. Second linear slide b; 423. Second connecting shaft; 424. Second motor; 5. Lifting drive mechanism; 510. Drive motor; 520. Transmission screw; 530. Pulley assembly; 531. Driving pulley; 532. Driven pulley; 533. Transmission belt; 540. Lifting slider; 550. Clamping block; 560. Anchor. 6. Plate; 7. Track; 8. Forming platform; 9. Bearing plate; 10. Roller assembly; 11. Roller drive motor; 12. Waste material collection box; 13. Collection box conveyor shaft; 14. Feeding device; 15. New material storage bin; 16. New material conveying assembly; 17. Positive pressure blower; 18. Conveying pipe; 19. Separator; 10. Drop hopper; 10. Material level switch; 11. Gate; 12. Bracket; 13. Waste material recycling device; 14. Waste material conveying assembly; 15. Horizontal conveying channel; 16. First spiral conveyor shaft; 17. Lifting conveying channel; 18. Second spiral conveyor shaft; 19. Waste material storage bin; 10. Screen; 11. Installation and fixing platform. Detailed Implementation

[0047] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0048] like Figure 1 As shown, this utility model provides a 3D printing device suitable for large-size printed parts, including a support frame 1, a printing assembly, a track 6, and a forming platform 7.

[0049] The support frame 1 is a vertical frame with a certain height and a built-in lifting drive mechanism 5. The printing assembly moves up and down reciprocally under the action of the lifting drive mechanism 5. Specifically, the printing assembly includes a rectangular frame bracket 2 and a sand-spreading device 3 and an inkjet printing device 4 installed on the bracket 2. After the drive end of the lifting drive mechanism 5 is fixed to the outer side of the bracket 2, it can drive the bracket 2, the sand-spreading device 3 and the inkjet printing device 4 on the bracket 2 to move together. The sand-spreading device 3 is used to spread a layer of sand on the forming platform 7. The inkjet printing device 4 is used to spray the adhesive of the graphic required to manufacture the part onto the material layer. The track 6 is laid on the ground outside the support frame 1, specifically below the printing assembly. The forming platform 7 is movably mounted on the track 6, so that it can move to directly below the printing assembly to complete the printing and then move out of the range of the printing assembly. Multiple forming platforms 7 can be set to form a production line printing mode. This invention uses a lifting drive mechanism 5 to drive the entire printing assembly to reciprocate along the height of the support frame 1, enabling it to print layer by layer on the forming platform 7 from bottom to top. This eliminates the need for a forming cylinder to gradually descend and complete the printing process. The forming platform 7 only bears the increasing weight of the material layer throughout the printing process, ensuring stability and robustness. Similarly, the lifting drive mechanism 5 only handles the lifting and lowering of the printing assembly; changes in the weight of the material layer on the forming platform 7 do not affect the lifting drive mechanism 5. Furthermore, the sand-laying device 3 and the inkjet printing device 4 are relatively lightweight, and the sand-laying device 3 continuously feeds and adds material, making its weight change negligible relative to the overall structure. Therefore, the stability of the printing assembly during lifting and lowering is ensured, thereby controlling the printing thickness accuracy. Compared with existing technologies, the technical solution adopted in this application better meets the requirements for larger printed parts and a larger print run.

[0050] The specific operation process of this embodiment is as follows: the forming platform 7 enters the printing area below the printing assembly along the track 6. The bracket 2 descends to the initial printing position under the drive of the lifting drive mechanism 5. The sand spreading device 3 spreads sand onto the upper surface of the forming platform 7. The inkjet printing device 4 sprays adhesive onto the sand layer according to the printing pattern to complete one layer of printing. Then, the bracket 2 rises under the drive of the lifting drive mechanism 5. Specifically, according to the required layer printing thickness, the next layer of sand spreading and printing continues. After each layer of printing is completed, the lifting drive mechanism 5 drives the bracket 2 to rise one layer, and then the sand spreading device 3 spreads sand, and the inkjet printing device 4 sprays adhesive onto the sand surface according to the printing pattern until printing is completed. After printing is completed, the bracket 2 rises under the drive of the lifting drive mechanism 5, and the forming platform 7, together with the printed part, moves out of the printing range of the printing assembly along the track 6 to complete the current printing. Other forming platforms 7 can enter the printing range of the printing assembly along the track 6 to continue the next printing.

[0051] It is worth noting that the entire equipment is controlled by an industrial control system. The starting of all motors, sand-laying device 3 and inkjet printing device 4, as well as various switching units, are controlled by the industrial control system.

[0052] In some embodiments, such as Figure 2 As shown, the lifting drive mechanism 5 includes a drive motor 510, a transmission screw 520, a pulley set 530, and a lifting slider 540. The transmission screw 520 is vertically arranged inside the support frame 1, and its upper and lower ends are rotatably mounted on the bottom and top of the support frame 1 respectively through bearings and other rotating components. The drive motor 510 is fixedly mounted on the support frame 1 through a motor mounting seat. In this embodiment, it is fixed on the top outer side of the support frame 1. Its motor shaft and the transmission screw 520 are arranged in parallel, and the two are connected by the pulley set 530. Figure 4 The pulley assembly 530 shown includes a driving pulley 531, a driven pulley 532, and a transmission belt 533 wound around both. The driving pulley 531 is fixedly sleeved on the motor shaft of the drive motor 510. The driven pulley 532 is aligned with the driving pulley 531 at the same horizontal level and is fixedly sleeved on the rod of the transmission screw 520. The lifting slider 540 is threadedly connected to the rod of the transmission screw 520, and one side of the slider is connected to one outer side of the bracket 2 through a clamping block 550 and a mounting plate 560. Specifically, as shown... Figure 3 As shown, the clamping block 550 is U-shaped, with its two side walls clamping the two sides of the lifting slider 540 and connected by bolts. The bottom of the clamping block 550 is bolted to one side of the mounting plate 560, and the other side of the mounting plate 560 is bolted to the side of the bracket 2. The clamping block 550 and the mounting plate 560 can more stably connect the lifting slider 540 and the bracket 2.

[0053] It is worth noting that, to avoid interference, the drive motor 510 and the bracket 2 are located on opposite sides of the support frame 1. The lead screw and slider system can stably drive the bracket 2, enabling it to move back and forth in the vertical direction along with the lifting slider 540. The use of the pulley set 530 for transmission can effectively control the transmission ratio to ensure a relatively smooth movement speed of the bracket 2 and guarantee printing accuracy.

[0054] In some embodiments, such as Figure 5 and 7 The sand-laying device 3 shown includes a movable material cart 310 and a material cart drive mechanism 320. The material cart 310 has an openable and closable discharge port at its bottom. The material cart drive mechanism 320 is mounted on the bracket 2, and its drive end is connected to the body of the material cart 310 to drive the material cart 310 to move along the direction parallel to the upper surface of the forming platform 7. Specifically, the material cart drive mechanism 320 includes two parallel first linear slides a321 and b322, a first connecting shaft 323 responsible for connecting the two first linear slides and transmitting power, and a first motor 324. The first linear slides a321 and b322... The length direction is the same as the moving direction of the forming platform 7. That is, the first linear slide a321 and the first linear slide b322 are respectively fixedly installed on the frame on both sides of the bracket 2 along the moving direction of the forming platform 7. Under the drive of the first motor 324 and the transmission action of the first connecting shaft 323, the sliders on the first linear slide a321 and the first linear slide b322 can move synchronously. The body of the material cart 310 is fixedly connected to the sliders on the first linear slide a321 and the first linear slide b322 respectively, and moves with the sliders. The movable material cart 310 facilitates more uniform sand spreading on the forming platform 7.

[0055] Similarly, such as Figure 6 and 7 As shown, the inkjet printing device 4 includes main working components, namely an adhesive jetting unit 410 for jetting adhesive and an adhesive jetting unit drive mechanism 420. The adhesive jetting unit drive mechanism 420 is similar in configuration to the cart drive mechanism 320, including two parallel second linear slides a421 and b422, a second connecting shaft 423 for connecting the two second linear slides and for transmission, and a second motor 424. Its arrangement is also the same as that of the cart drive mechanism 320. However, to avoid mutual interference, the second linear slides a421 and b422 are located on both sides of the first linear slides a321 and b322, respectively, to prevent the sliders on each slide from interfering with each other during movement. At the same time, the adhesive jetting unit 410 and the sliders on the second linear slides a421 and b422 are raised when connected to each other to prevent the adhesive jetting unit 410 and the cart 310 from interfering with each other during movement.

[0056] In some embodiments, such as Figure 1 and 8 As shown, the device has a feeding device 8, which includes a new material storage bin 810, a new material conveying assembly 820, and a discharge hopper 830. The discharge hopper 830 is mounted on the bracket 2 via a support 840, and has an openable discharge port below it. The upper opening of the material cart 310 is open for feeding. The new material conveying assembly 820 connects the new material storage bin 810 and the discharge hopper 830. The new material storage bin 810 is located on the ground not far from the support frame 1 and can replenish sand to the material cart 310 to ensure continuous production.

[0057] In some embodiments, such as Figure 8 and 9 As shown, the new material conveying assembly 820 includes a positive pressure blower 821, a conveying pipe 822, and a separator 823. The positive pressure blower 821 is installed on the top of the new material storage silo 810. The inlet end of the conveying pipe 822 is connected to the inside of the new material storage silo 810, and the outlet end is connected to the discharge hopper 830 through the separator 823. The separator 823 has holes for gas to escape. By using the positive pressure blower 821 and the conveying pipe 822, sand is conveyed remotely, and the separator 823 ensures that the high-pressure gas and sand are separated. Before entering the material cart 310, the material is separated. In addition, a material level switch 831 is installed on the material hopper 830. When the sand in the material hopper 830 reaches the position of the material level switch 831, the positive pressure blower 821 is controlled to stop blowing. At this time, the sand in the material hopper 830 is set to the full state and the feeding work can be carried out. Specifically, an electrically controlled gate 832 is installed below the material hopper 830 to open and close the material outlet. When the material cart 310 moves to the bottom of the material hopper 830, the gate 832 is opened to feed the material.

[0058] In some embodiments, such as Figure 10 and 11 As shown, a waste material recycling mechanism 9 is provided. The waste material recycling mechanism 9 includes a waste material conveying component 910 and a waste material storage bin 920. A waste material collection box 740 is fixedly connected to the outer periphery of the forming platform 7. The waste material collection box 740 has an open top, and its open end is aligned with the upper surface of the forming platform 7. The waste material conveying component 910 connects the waste material collection box 740 and the waste material storage bin 920. During the printing process, as the printing assembly rises, the height of the printed part also gradually increases, and the sand around it will slide down the side of the printed part, easily scattering to the outside of the forming platform 7. By setting up the waste material collection box 740, these scattered sand materials can be collected and sent to the waste material storage bin 920 through the waste material conveying component 910, ready for secondary printing, thus preventing the waste of sand materials.

[0059] The waste material collection boxes 740 are evenly distributed around the forming platform 7, including front and rear collection boxes and left and right collection boxes. One of the left and right collection boxes has a discharge pipe extending downward from its bottom and a waste material outlet. The waste material conveying assembly 910 includes a conveying channel and a spiral conveying shaft rotatably connected in the conveying channel. The conveying channel is divided into two sections, including a horizontal conveying channel 911 and a lifting conveying channel 913. Two spiral conveying shafts are correspondingly provided, namely a first spiral conveying shaft 912 and a second spiral conveying shaft 914. The horizontal conveying channel 911 is horizontally arranged on the moving forming platform 7. Below the path, specifically directly below the left and right collection boxes with residual material outlets, the top opening of the horizontal transport section is used to receive residual material falling from the residual material outlet. Inside, a first spiral conveyor shaft 912 is installed. The lifting conveyor channel 913 is arranged vertically at an incline, with its lower end connected to the horizontal conveyor channel 911. Specifically, the horizontal conveyor channel 911 is located at the conveying end of the first spiral conveyor shaft 912. Its upper end is connected to the top of the residual material storage bin 920, which has a second spiral conveyor shaft 914 installed inside. The conveying direction of the second spiral conveyor shaft 914 is from bottom to top.

[0060] Specifically, there are multiple waste material outlets, and multiple openings are provided at the top of the horizontal conveying channel 911, which can be aligned with the waste material outlets one by one. In order to facilitate the quick discharge of waste material in the waste material collection box 740 into the horizontal conveying channel 911 through the waste material outlet, collection box conveying shafts 741 can be provided in the front and rear collection boxes respectively.

[0061] In some embodiments, a screen 921 is fixedly connected inside the waste material storage bin 920. The screen 921 is arranged below the upper end of the lifting and conveying channel 913. The collected waste material is first filtered by the screen 921, which can remove some of the lumps of sand and impurities, leaving only the sand that can be reused.

[0062] In some embodiments, such as Figure 11 and 12 The forming platform 7 shown includes a rectangular support plate 710 and a roller assembly 720 rotatably mounted on its lower end. The support plate 710 is arranged parallel to the track surface of the track 6 and moves along the track 6 via the roller assembly 720. The roller assembly 720 can be driven by a roller drive motor 730, which is synchronously mounted on the lower end of the support plate 710. The roller assembly 720 drives the support plate 710 to move on the track 6, and the parallel arrangement of the support plate 710 ensures the stability of the movement.

[0063] In some embodiments, there are multiple support frames 1, and the lifting drive mechanisms 5 within the multiple support frames 1 are synchronously controlled by a PLC. The bottoms of the multiple support frames 1 are connected together by a mounting platform 10. The mounting platform 10 is a foundation platform or a welded platform, which ensures the firm installation of the support frames 1 on both sides and facilitates adjustment of the horizontal and vertical alignment of the lifting drive mechanisms 5. To meet the needs of larger printed parts, as the volume of the printing assembly increases, the number of support frames 1 can be increased accordingly. Figure 13 and Figure 14 The figures shown are installation diagrams of support frame 1 and bracket 2 when there are 4 and 6 support frames, respectively.

[0064] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A 3D printing device suitable for large-size printed parts, characterized in that, include: Support frame (1); The printing assembly includes a bracket (2) and a sand-spreading device (3) and an inkjet printing device (4) mounted on the bracket (2); a lifting drive mechanism (5) is installed inside the support frame (1), and its drive end is fixedly connected to the bracket (2) to drive the bracket (2) to reciprocate along the height direction of the support frame (1); Track (6), said track (6) is arranged below the printing assembly; The molding platform (7) is a plurality of such molding platforms (7), and the plurality of molding platforms (7) are movably mounted on the track (6) so as to move to the bottom of the printing assembly to complete printing and then move out.

2. The 3D printing equipment suitable for large-size printed parts according to claim 1, characterized in that, The lifting drive mechanism (5) includes a drive motor (510), a transmission screw (520), a pulley set (530), and a lifting slider (540). The drive motor (510) is fixedly installed on the support frame (1). The transmission screw (520) is vertically arranged inside the support frame (1), and its upper and lower ends are rotatably connected to the top and bottom of the support frame (1), respectively. The pulley set (530) is connected to the motor shaft of the drive motor (510) and the transmission screw (520). The lifting slider (540) is threadedly connected to the rod body of the transmission screw (520) and fixedly connected to the bracket (2).

3. The 3D printing equipment suitable for large-size printed parts according to claim 1, characterized in that, The sand spreading device (3) includes a material cart (310) and a material cart drive mechanism (320). The bottom of the material cart (310) is provided with an openable and closable discharge port. The material cart drive mechanism (320) is mounted on the bracket (2) and its drive end is fixedly connected to the material cart (310) to drive the material cart (310) to move in a direction parallel to the upper surface of the forming platform (7).

4. A 3D printing device suitable for large-size printed parts according to claim 3, characterized in that, It also includes a feeding device (8), which includes a new material storage bin (810), a new material conveying assembly (820), and a dropping hopper (830). The dropping hopper (830) is mounted on the bracket (2) and has an openable dropping port below it. The dropping port is connected to the feed inlet at the top of the material cart (310). The new material conveying assembly (820) connects the new material storage bin (810) and the dropping hopper (830).

5. A 3D printing device suitable for large-size printed parts according to claim 4, characterized in that, The new material conveying assembly (820) includes a positive pressure blower (821), a conveying pipe (822), and a separator (823). The feed end of the positive pressure blower (821) is connected to the interior of the new material storage bin (810). The inlet end of the conveying pipe (822) is connected to the outlet end of the positive pressure blower (821), and the outlet end is connected to the discharge hopper (830) through the separator (823). The separator (823) has holes for gas to escape.

6. A 3D printing device suitable for large-size printed parts according to claim 1, characterized in that, It also includes a waste material recycling device (9), which includes a waste material conveying assembly (910) and a waste material storage bin (920); the molding platform (7) has a waste material collection box (740) on its outer periphery, the waste material collection box (740) is open at the top and its open end is aligned with the upper surface of the molding platform (7); the waste material conveying assembly (910) connects the waste material collection box (740) and the waste material storage bin (920).

7. A 3D printing device suitable for large-size printed parts according to claim 6, characterized in that, The waste material conveying assembly (910) includes a conveying channel and a spiral conveying shaft rotatably connected within the conveying channel. The inlet end of the conveying channel is connected to the waste material collection box (740), and its outlet end is connected to the waste material storage bin (920).

8. A 3D printing device suitable for large-size printed parts according to claim 7, characterized in that, A screen (921) is fixedly connected inside the waste material storage bin (920).

9. A 3D printing device suitable for large-size printed parts according to claim 1, characterized in that, The forming platform (7) includes a support plate (710) and a roller assembly (720) rotatably connected to its lower end. The support plate (710) is arranged parallel to the track surface of the track (6). The roller assembly (720) is rotatably mounted on the track (6).

10. A 3D printing device suitable for large-size printed parts according to claim 1, characterized in that, The support frame (1) has at least two and is configured in an even number, and the lifting drive mechanism (5) in the multiple support frames (1) is synchronously controlled by a PLC.

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