Metal three-dimensional printer and printing method thereof

Abstract

The invention relates to the technical field of three-dimensional printers, in particular to a metal three-dimensional printer and a printing method thereof.The metal three-dimensional printer comprises a printing cabin, an isolation cabin and a circulating filtering mechanism, and the isolation cabin comprises a flexible isolation film, an isolation box and the circulating filtering mechanism; the circulating filtering mechanism comprises an air storage tank, a filtering box installed on the outer wall of one side of the printing cabin and a micro air pump installed on the filtering box. According to the printing cabin, the sealing performance of the printing cabin can be improved, so that the protection capability of inert gas is improved, meanwhile, the interior of the printing cabin is effectively protected, and waste scraps generated during printing are conveniently cleaned. The isolation cabin and the circulating filtration mechanism are in synergistic interaction, the isolation box provides a better sealing environment for the circulating filtration mechanism, the circulating filtration system can remove metal smoke dust generated during printing, pollution to the isolation cabin is reduced, the cleaning frequency of the isolation cabin can be effectively reduced, and the service life of the isolation cabin is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of three-dimensional printers, in particular to a metal three-dimensional printer and a printing method thereof. BACKGROUND

[0002] A three-dimensional printer is a device that constructs a three-dimensional object through layer-by-layer printing based on a digital model of the three-dimensional object, using materials such as plastic, liquid photopolymer resin, and metal. Three-dimensional printers using metal as raw materials have been widely used in many fields, especially in high-value-added scenarios such as aerospace, medical treatment, automobiles, and mold manufacturing, and have shown irreplaceable advantages. The application scope and depth of three-dimensional printers using metal as raw materials are continuously expanding as the technology matures and costs decrease.

[0003] Currently, printing technologies using metal as raw materials mainly include the following categories: Powder Bed Fusion (PBF), Directed Energy Deposition (DED), Binder Jetting (BJ), and Sheet Lamination (SL). The essence of these technologies is additive manufacturing, which involves converting a discrete three-dimensional model into a two-dimensional layer and then using the controllable formability of metal materials to accumulate layer by layer to ultimately achieve the manufacturing of complex components with high design freedom. All of these technologies require high-temperature processing of metal raw materials. When printing finished products, the metal printing raw materials are prone to oxidation at high temperatures, which affects the printing quality, so inert gas needs to be filled for protection.

[0004] Traditional inert gas filling methods can only make the inert gas concentration in the printing cabin within a low range, and the protection is not sufficient, resulting in poor quality of the printed products. Metal materials are prone to produce smoke containing metal powder when heated, and purifying the environment in the printing cabin is beneficial to improve the printing quality and protect the equipment. The current methods for removing smoke dust are relatively complex in structure and high in cost, and have low practicality. The printing cabin of a metal three-dimensional printer needs to be provided with various working components such as a raw material rack, a material conveying pipe, an inert gas tank, and a gas conveying pipe, which results in poor sealing performance of the printing cabin itself, and the effectiveness of the inert gas is also poor. The waste debris generated during printing can pollute the inner wall of the printing cabin, causing damage to the printer, and it is not convenient to clean in the small space of the printing cabin. SUMMARY

[0005] Therefore, the purpose of the present application is to provide a metal three-dimensional printer and a printing method thereof, which can improve the sealing performance of the printing cabin, thereby improving the protection capability of the inert gas, effectively protecting the inside of the printing cabin, and facilitating the cleaning of waste debris generated during printing.

[0006] The technical scheme of the present application is: In a first aspect, embodiments of the present application provide a metal three-dimensional printer, comprising: A printing cabin, a filter box is mounted on the outer wall of the printing cabin, and the filter box contains a filtering solution; An isolation cabin, the isolation cabin comprises a flexible isolation membrane and an isolation box connected in an up-down manner, both the flexible isolation membrane and the isolation box are located in the printing cabin, and the isolation box is mounted at the bottom of the printing cabin; the filter box and the isolation cabin are connected through a pipeline to realize the communication of gas.

[0007] In a further aspect, the installation pipe and the connecting plate are connected in sequence from top to bottom in the printing cabin, the upper end of the flexible isolation membrane is detachably connected with the connecting plate, and the interiors of the installation pipe, the flexible isolation membrane and the isolation box are communicated.

[0008] In a further aspect, the isolation cabin is connected with a gas storage tank, the interiors of the gas storage tank and the isolation cabin are communicated, the filter box is connected with a gas outlet pipe, one end of the gas outlet pipe is communicated with the interior of the filter box, the other end of the gas outlet pipe is communicated with the interior of the isolation cabin, a one-way valve is mounted in the interior of the gas outlet pipe, and the flow direction of the one-way valve is from the filter box into the isolation cabin.

[0009] In a further aspect, a micro air pump is arranged at the top of the filter box, the air inlet of the micro air pump is communicated with the interior of the isolation cabin, and the air outlet of the micro air pump is located at the bottom of the filter box.

[0010] In a further aspect, the micro air pump is connected with a power supply and a switch controller through wires, the micro air pump comprises an air inlet and an air outlet, the air inlet is connected with a suction pipe, the air outlet is connected with a filter pipe, one end of the suction pipe away from the micro air pump is communicated with the interior of the isolation cabin, and one end of the filter pipe away from the micro air pump is located in the filtering solution.

[0011] In a further aspect, a first connecting frame is fixedly connected to the top of the flexible isolation membrane, a clamping plate is fixedly connected to the top of each of the pair of outer walls of the first connecting frame, a clamping buckle is arranged on each side of the connecting plate, and the connecting plate and the clamping plate are tightly connected through the clamping buckle. In a further aspect, a second connecting frame is fixedly connected to the bottom of the flexible isolation membrane, a plurality of mounting holes are arranged in the outer wall of the second connecting frame, a plurality of mounting holes adapted to the second connecting frame are arranged in the top of the outer wall of the isolation box, and the isolation box and the second connecting frame are tightly connected through the connecting pieces arranged in the mounting holes.

[0012] A further embodiment is that the isolation box has a door hinged to one side, a latch is fixed to the side of the door away from the hinge, a locking block that cooperates with the latch is fixedly connected to the outer wall of one side of the isolation box, a viewing hole is opened on one side of the door, and a viewing window is fixedly connected to the inner wall of the viewing hole.

[0013] A further alternative is that the filtration solution is an alkaline sulfite solution composed of a mixture of sodium sulfite (NaSO) with a concentration of 0. wt% and sodium hydroxide (NaOH) with a concentration of 0. wt%.

[0014] A further improvement is that the filter box has an inlet at the top and an outlet at the bottom, both of which are connected to a sealing cap, and a pressure relief port is provided at the top of the filter box.

[0015] Secondly, embodiments of the present invention also provide a printing method for a metal 3D printer, wherein the following steps are performed using the aforementioned metal 3D printer: S10 Printing Pre-processing: Sealed isolation chamber, inert gas from the gas storage tank is filled into the isolation chamber, and at the same time the micro air pump is turned on to make the gas in the isolation chamber circulate and deoxygenate in the circulation filtration mechanism; S20 printing execution; After S30 printing, the printed product is slowly cooled to room temperature in an inert gas protective atmosphere in the isolation chamber. Then the door of the isolation chamber is opened and the printed product is taken out.

[0016] In summary, the present invention has the following beneficial effects: 1. An isolation chamber is formed by the tight connection between the isolation box and the flexible isolation membrane inside the printing chamber. This allows the inert gas to have better utilization efficiency within the isolation chamber, effectively improving the quality of the printed product. Waste debris generated during printing is also isolated within the isolation chamber, effectively protecting the inside of the printing chamber from contamination. Furthermore, the isolation box and the flexible isolation membrane can be disassembled and removed from the printing chamber for cleaning, which is convenient and quick.

[0017] 2. By setting up a filter box, filter solution, micro air pump and air tank to form a circulating filtration mechanism, the air in the isolation chamber is circulated and purified, which greatly reduces the oxygen content in the circulating air and increases the concentration of inert gas in the isolation chamber. In addition, the filter solution can remove metal fumes in the circulating air while removing oxygen, improve the environment in the isolation chamber and improve printing quality.

[0018] 3. The isolation chamber and the circulating filtration mechanism work synergistically. The isolation chamber provides a better sealing environment for the circulating filtration mechanism. The circulating filtration system can remove metal fumes generated during printing, reduce the contamination of the isolation chamber, effectively reduce the cleaning frequency of the isolation chamber and increase its service life. Attached Figure Description

[0019] Figure 1 This is a structural diagram of a metal 3D printer; Figure 2 This is an enlarged structural schematic diagram of the flexible isolation membrane; Figure 3 This is an enlarged structural diagram of the isolation box; Figure 4 yes Figure 1 Enlarged structural diagram at point A; Figure 5 This is a schematic diagram showing the positional relationship between the filtered solution and the filter tube; Figure 6 This is a front view structural diagram of the interior of the printing chamber; Figure 7 This is a flowchart of the printing method for a metal 3D printer.

[0020] Figure label: 1. Printing chamber; 11. Mounting tube; 12. Connecting plate; 2. Flexible isolation membrane; 21. First connecting frame; 211. Pallet; 22. Second connecting frame; 3. Isolation box; 31. Box door; 4. Filter box; 41. Filtration solution; 42. Miniature air pump; 421. Suction pipe; 422. Filter pipe; 43. Air outlet pipe; 5. Gas storage tank; 51. Air inlet pipe. Detailed Implementation

[0021] To make the technical solutions and advantages of the embodiments of this application clearer, the exemplary embodiments of this application will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not an exhaustive list of all embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0022] This embodiment provides a metal 3D printer, including: The printing chamber 1 and the isolation chamber are connected in sequence from top to bottom to the inner wall of the top of the printing chamber 1 by an installation tube 11 and a connecting plate 12. The inside of the installation tube 11 is used to install various devices required for printing, such as straightening devices and feeding devices. The top of the installation tube 11 is fixedly connected to the inner wall of the top of the printing chamber 1 by welding or bolts, and the bottom of the installation tube 11 is fixedly connected to the top of the connecting plate 12 by welding or bolts.

[0023] A filter box 4 is connected to one side of the outer wall of the printing chamber 1 by bolts or screws. The filter box 4 contains a filtration solution 41. An inlet is located at the top of the filter box 4, through which the filtration solution 41 is placed inside. An outlet is located at the bottom of the filter box 4, through which waste liquid is discharged after prolonged use. Both the inlet and outlet are sealed with caps via threads or snap-fit ​​connections. Additionally, to prevent excessive air pressure inside the filter box 4 during use, a pressure relief port is located at the top of the filter box 4, connected to a pressure relief valve via threads or bolts.

[0024] An observation window is provided on the outer wall of the filter box 4 away from the printing chamber 1. The inner wall of the observation window is welded or inlaid with a transparent plate made of tempered glass or polycarbonate. The state of the filter solution 41 can be observed through the transparent plate, and the filter solution 41 can be replaced in time to ensure the deoxygenation and purification effect.

[0025] The filter solution 41 has two functions: first, it filters oxygen in the circulating air, reduces the oxygen content in the printing chamber 1, and increases the concentration of inert gas, thereby better protecting the printing materials; second, it purifies the circulating air while removing oxygen, as the filter solution 41 can adsorb dust in the circulating air, improve the environment in the printing chamber 1, and improve the printing quality.

[0026] Based on the function of the filter solution 41 described above, when selecting the filter solution 41, it should be considered that the solution not only has a deoxygenation effect, but also will not react chemically with the metal powder in the flue gas to produce harmful substances during filtration. Taking all factors into consideration, in this embodiment, the filter solution 41 is an alkaline sulfite solution composed of a mixture of 0.3 wt% sodium sulfite (Na2SO3) and 0.03 wt% sodium hydroxide (NaOH). The sodium sulfite solution acts as the main deoxygenating agent, while the sodium hydroxide acts as a pH adjuster, regulating the pH value of the sodium sulfite solution to maintain a strongly alkaline state and ensure the deoxygenation effect. This mixed solution is simple to prepare, inexpensive, and can quickly react with oxygen in the circulating air. It can also adsorb metal powder in the flue gas without producing harmful substances. Furthermore, the alkaline sulfite solution exhibits a reaction rate that increases with increasing temperature, creating a positive cycle during the filtration process.

[0027] A vent pipe 43 is connected to the top of the filter box 4 by welding or clamping. One end of the vent pipe 43 communicates with the inside of the filter box 4, and the other end communicates with the inside of the isolation chamber. One end of the vent pipe 43 is located at the top of the filter box 4 and above the filtered solution 41. The vent pipe 43 is used to discharge the filtered gas in the filter box 4 into the printing chamber 1. A one-way valve is installed inside the vent pipe 43. The flow direction of the one-way valve is from the filter box 4 into the isolation chamber. The function of the one-way valve is to ensure that the circulating air can only enter the isolation chamber from the filter box 4.

[0028] The isolation chamber includes a flexible isolation membrane 2 and an isolation box 3. The top of the outer wall of the flexible isolation membrane 2 is fixedly connected to a first connecting frame 21 by welding or bonding. The top of the two symmetrical outer walls of the first connecting frame 21 are each connected to symmetrically arranged clamping plates 211 by welding or bolting. The two symmetrical outer walls of the connecting plate 12 are each fitted with multiple symmetrically arranged buckles by bolts or screws with a gap fit. The first connecting frame 21 and the connecting plate 12 can be detachably connected by the cooperation of the buckles and clamping plates 211.

[0029] The bottom of the outer wall of the flexible isolation membrane 2 is fixedly connected to the second connecting frame 22 by welding or bonding. The outer wall of the second connecting frame 22 has multiple mounting holes or threaded holes. The top of the outer wall of the isolation box 3 also has multiple mounting holes or threaded holes that correspond one-to-one with the second connecting frame 22, so that the second connecting frame 22 and the isolation box 3 can be tightly connected by bolts or screws.

[0030] In this embodiment, the flexible isolation membrane 2 is made of a high-temperature resistant flexible material, such as polyimide or Teflon. The purpose of using a flexible material is to facilitate the operation of the printing components inside the isolation chamber, such as heating devices and nozzles. The heating device is located inside the mounting tube 11, and the nozzle is located below the heating device. The bottom of the nozzle is located inside the flexible isolation membrane 2. If it is necessary to install or remove the nozzle, it is only necessary to separate the flexible isolation membrane from the connecting plate 12, without having to disassemble the entire isolation chamber.

[0031] The isolation chamber 3 is fixedly connected to the bottom inner wall of the printing chamber 1 by bolts or screws. A door 31 is hinged to one side of the isolation chamber 3, and a latch is rotatably connected to the side of the door 31 away from the hinge by bolts or rivets. A locking block that cooperates with the latch is welded or bolted to the outer wall of the other side of the isolation chamber 3. A viewing hole is opened on one side of the door 31, and a viewing window made of high-temperature resistant transparent material such as quartz glass or high-silica glass is fixedly connected to the inner wall of the viewing hole, allowing observation of the printing environment inside the isolation chamber.

[0032] In this embodiment, to improve the sealing performance of the isolation chamber, the first connecting frame 21 is bonded with a high-temperature resistant sealing material such as a fluororubber ring or a silicone rubber ring at its connection with the connecting plate 12. Similarly, the second connecting frame 22 is bonded with a high-temperature resistant sealing material such as a fluororubber ring or a silicone rubber ring at its connection with the isolation box 3. The outer wall of the door 31 of the isolation box 3, on the side in contact with the isolation 3, is also welded or bonded with a high-temperature resistant sealing material such as a fluororubber ring or a silicone rubber ring. Furthermore, the top of the connecting plate 12 has a through hole adapted to the mounting tube 11, allowing the internal space of the mounting tube 11 to communicate with the internal spaces of the flexible isolation membrane 2 and the isolation box 3.

[0033] The gas storage tank 5 is located outside the printing chamber 1. The gas storage tank 5 stores inert gases, such as nitrogen and argon. The gas storage tank 5 is connected to the gas inlet pipe 51 through a flange or ferrule. The outlet end of the gas inlet pipe 51 is located inside the isolation chamber. The gas storage tank 5 is connected to the interior of the isolation chamber through the gas inlet pipe 51. The inert gas in the gas storage tank 5 is filled into the isolation chamber through the gas inlet pipe 51.

[0034] The miniature air pump 42 is mounted on top of the filter box 4 by bolts or screws. The miniature air pump 42 is equipped with connecting wires, which connect to a power supply and a switch controller, etc. The miniature air pump 42 includes an air inlet and an air outlet. The air inlet is connected to an extraction pipe 421, and the air outlet is connected to a filter pipe 422. The end of the extraction pipe 421 away from the miniature air pump 42 communicates with the interior of the isolation chamber, used to extract air from the isolation chamber; the end of the filter pipe 422 away from the miniature air pump 42 is located within the filter solution 41.

[0035] The function of the miniature air pump 42 is to draw air from the isolation chamber into the filter box 4. After being filtered in the filter box 4, the air re-enters the isolation chamber, thus realizing the circulation of gas in the isolation chamber. Therefore, the miniature air pump 42 can be a miniature air extraction pump or a miniature gas circulation pump, etc.

[0036] In this embodiment, in order to facilitate the assembly and disassembly of the isolation chamber as a whole, the connection points of the exhaust pipe 421 and the exhaust pipe 43 with the isolation chamber are both located at the top of the connecting plate 12. Two through holes are opened at the top of the connecting plate 12, and the two through holes are respectively adapted to the exhaust pipe 421 and the exhaust pipe 43. A sealing ring is provided at the connection points of the exhaust pipe 421 and the exhaust pipe 43 with the through holes.

[0037] In this embodiment, to facilitate the assembly and disassembly of the isolation chamber as a whole, an air pipe connector is provided on one outer wall of the isolation box 3. The air pipe connector can be a quick-connect fitting or a crimp fitting, etc. The air inlet pipe 51 is detachably connected to the air pipe connector and communicates with the interior of the isolation chamber through the air pipe connector.

[0038] This embodiment also provides a printing method for a metal 3D printer. This printing method uses the aforementioned metal 3D printer and performs the following steps: S10 Printing Pre-processing Steps: This step includes the isolation chamber installation step and the air circulation and filtration step.

[0039] Installation steps of the isolation chamber: First, connect the flexible isolation membrane 2 and the isolation box 3 tightly through the second connecting frame 22. Then, install the isolation box 3 on the bottom inner wall of the printing chamber 1 with bolts or screws. Finally, connect the flexible isolation membrane 2 and the connecting plate 12 tightly through the buckles on the connecting plate 12. This will make the internal space of the installation tube 11, the flexible isolation membrane 2 and the isolation box 3 form a sealed isolation chamber. Then, the air circulation filtration step will be performed.

[0040] Air circulation and filtration steps: First, open the valve of the air tank 5 to allow the inert gas inside to enter the isolation chamber through the air inlet pipe 51. Then, turn on the miniature air pump 42. The miniature air pump 42 extracts air from the isolation chamber through the air extraction pipe 421, and then sends the extracted air into the filter solution 41 inside the filter box 4 through the filter pipe 422. The filter solution 41 reacts chemically with the oxygen in the air to achieve a deoxygenation effect. The deoxygenated air then re-enters the isolation chamber through the air outlet pipe 43, thus achieving air circulation and deoxygenation filtration within the isolation chamber. This step should continue for 5-30 minutes, depending on the actual printing requirements and the size of the isolation chamber, before proceeding with the printing process.

[0041] S20 Printing Execution Steps: In actual production, regardless of the technology used for printing, its essence is additive manufacturing. This involves using a discrete three-dimensional model as two-dimensional layers, then leveraging the controllable formability of metal materials to build up layers one by one, ultimately achieving the manufacturing of complex components with high design freedom. All of these processes require high-temperature treatment of the metal raw materials. Therefore, this embodiment will not detail the printing execution steps.

[0042] It should be noted that the isolation chamber and air circulation filtration device proposed in this application are suitable for metal 3D printing technologies such as powder bed melting, directional energy deposition, binder jetting, and sheet lamination.

[0043] Based on the characteristics of the flexible isolation membrane 2 made of polyimide or Teflon and other materials used in this embodiment, and the characteristics of the filter solution 41 composed of 0.3 wt% sodium sulfite (Na2SO3) and 0.03 wt% sodium hydroxide (NaOH), the optimal working environment for the isolation chamber and air circulation filtration device in this embodiment should be a heating temperature of 200℃-500℃. Furthermore, the filter solution 41 is initially colorless or pale yellow, but its color will darken after chemically reacting with oxygen and metal fumes in the circulating air. Therefore, the state of the filter solution 41 can be observed through the observation window set on the filter box 4, and a new filter solution 41 can be replaced in time to ensure the deoxygenation and purification effect.

[0044] In this embodiment, the printing execution step S20 is executed simultaneously with the printing pretreatment step S10, which is used to draw the metal fumes generated during printing into the filter solution 41 for filtration via a micro air pump 42.

[0045] S30 Post-Printing Processing Steps: After printing is completed, the printed product should continue to be slowly cooled in an inert gas protective atmosphere in the isolation chamber. After cooling to room temperature, first, open the door 31 of the isolation chamber 3 and take out the printed product. Then, separate and disassemble the flexible isolation membrane 2 from the connecting plate 12, separate and disassemble the air inlet pipe 51 from the air pipe connector on the isolation chamber 3, and then separate and disassemble the isolation chamber 3 from the printing chamber 1. Clean the flexible isolation membrane 2 and the isolation chamber 3.

[0046] In summary, the metal 3D printer and its printing method proposed in this embodiment have the following beneficial effects: 1. An isolation chamber is formed by the tight connection between the isolation box and the flexible isolation membrane inside the printing chamber. This allows the inert gas to have better utilization efficiency within the isolation chamber, effectively improving the quality of the printed product. Waste debris generated during printing is also isolated within the isolation chamber, effectively protecting the inside of the printing chamber from contamination. Furthermore, the isolation box and the flexible isolation membrane can be disassembled and removed from the printing chamber for cleaning, which is convenient and quick.

[0047] 2. By setting up a filter box, filter solution, micro air pump and air tank to form a circulating filtration mechanism, the air in the isolation chamber is circulated and purified, which greatly reduces the oxygen content in the circulating air and increases the concentration of inert gas in the isolation chamber. In addition, the filter solution can remove metal fumes in the circulating air while removing oxygen, improve the environment in the isolation chamber and improve printing quality.

[0048] 3. The isolation chamber and the circulating filtration mechanism work synergistically. The isolation chamber provides a better sealing environment for the circulating filtration mechanism. The circulating filtration system can remove metal fumes generated during printing, reduce the contamination of the isolation chamber, effectively reduce the cleaning frequency of the isolation chamber and increase its service life.

[0049] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0051] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0052] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0053] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A metal three-dimensional printer characterized by comprising: The utility model relates to a printing cabin (1) is provided with filter box (4) on the outer wall, and the filter box (4) is filled with filter solution (41) in, and the utility model relates to a isolation cabin that is provided with flexible isolation film (2) and isolation box (3) that are connected up and down, and the flexible isolation film (2) and isolation box (3) are all located in printing cabin (1), and the isolation box (3) is installed at the bottom of printing cabin (1), and the filter box and isolation cabin are communicated by pipeline. The utility model relates to a printing cabin (1) is provided with filter box (4) on the outer wall, and the filter box (4) is filled with filter solution (41) in, and the utility model relates to a isolation cabin that is provided with flexible isolation film (2) and isolation box (3) that are connected up and down, and the flexible isolation film (2) and isolation box (3) are all located in printing cabin (1), and the isolation box (3) is installed at the bottom of printing cabin (1), and the filter box and isolation cabin are communicated by pipeline. The utility model relates to a printing cabin (1) is provided with filter box (4) on the outer wall, and the filter box (4) is filled with filter solution (41) in, and the utility model relates to a isolation cabin that is provided with flexible isolation film (2) and isolation box (3) that are connected up and down, and the flexible isolation film (2) and isolation box (3) are all located in printing cabin (1), and the isolation box (3) is installed at the bottom of printing cabin (1), and the filter box and isolation cabin are communicated by pipeline.

2. The metal three-dimensional printer according to claim 1, wherein The utility model relates to a printing cabin (1) is provided with filter box (4) on the outer wall, and the filter box (4) is filled with filter solution (41) in, and the utility model relates to a isolation cabin that is provided with flexible isolation film (2) and isolation box (3) that are connected up and down, and the flexible isolation film (2) and isolation box (3) are all located in printing cabin (1), and the isolation box (3) is installed at the bottom of printing cabin (1), and the filter box and isolation cabin are communicated by pipeline.

3. The metal three-dimensional printer according to claim 1, wherein The utility model relates to a printing cabin (1) is provided with filter box (4) on the outer wall, and the filter box (4) is filled with filter solution (41) in, and the utility model relates to a isolation cabin that is provided with flexible isolation film (2) and isolation box (3) that are connected up and down, and the flexible isolation film (2) and isolation box (3) are all located in printing cabin (1), and the isolation box (3) is installed at the bottom of printing cabin (1), and the filter box and isolation cabin are communicated by pipeline.

4. The metal three-dimensional printer according to claim 3, wherein The utility model relates to a printing cabin (1) is provided with filter box (4) on the outer wall, and the filter box (4) is filled with filter solution (41) in, and the utility model relates to a isolation cabin that is provided with flexible isolation film (2) and isolation box (3) that are connected up and down, and the flexible isolation film (2) and isolation box (3) are all located in printing cabin (1), and the isolation box (3) is installed at the bottom of printing cabin (1), and the filter box and isolation cabin are communicated by pipeline.

5. The metal three-dimensional printer according to claim 4, wherein The utility model relates to a printing cabin (1) is provided with filter box (4) on the outer wall, and the filter box (4) is filled with filter solution (41) in, and the utility model relates to a isolation cabin that is provided with flexible isolation film (2) and isolation box (3) that are connected up and down, and the flexible isolation film (2) and isolation box (3) are all located in printing cabin (1), and the isolation box (3) is installed at the bottom of printing cabin (1), and the filter box and isolation cabin are communicated by pipeline.

6. The metal three-dimensional printer according to claim 2, wherein The utility model relates to a printing cabin (1) is provided with filter box (4) on the outer wall, and the filter box (4) is filled with filter solution (41) in, and the utility model relates to a isolation cabin that is provided with flexible isolation film (2) and isolation box (3) that are connected up and down, and the flexible isolation film (2) and isolation box (3) are all located in printing cabin (1), and the isolation box (3) is installed at the bottom of printing cabin (1), and the filter box and isolation cabin are communicated by pipeline.

7. The metal three-dimensional printer according to claim 6, wherein The utility model relates to a printing cabin (1) is provided with filter box (4) on the outer wall, and the filter box (4) is filled with filter solution (41) in, and the utility model relates to a isolation cabin that is provided with flexible isolation film (2) and isolation box (3) that are connected up and down, and the flexible isolation film (2) and isolation box (3) are all located in printing cabin (1), and the isolation box (3) is installed at the bottom of printing cabin (1), and the filter box and isolation cabin are communicated by pipeline.

8. The metal three-dimensional printer according to claim 1, wherein The utility model relates to a printing cabin (1) is provided with filter box (4) on the outer wall, and the filter box (4) is filled with filter solution (41) in, and the utility model relates to a isolation cabin that is provided with flexible isolation film (2) and isolation box (3) that are connected up and down, and the flexible isolation film (2) and isolation box (3) are all located in printing cabin (1), and the isolation box (3) is installed at the bottom of printing cabin (1), and the filter box and isolation cabin are communicated by pipeline.

9. The metal three-dimensional printer according to claim 3, wherein The filtering solution (41) is an alkaline sulfite solution mixed by sodium sulfite (Na2SO3) with a concentration of 0.3 wt% and sodium hydroxide (NaOH) with a concentration of 0.03 wt%.

10. The metal three-dimensional printer according to claim 3, wherein The top of the filtering box (4) is provided with a liquid inlet, and the bottom of the filtering box (4) is provided with a liquid outlet; the liquid inlet and the liquid outlet are both connected with sealing covers; and the top of the filtering box (4) is provided with a pressure relief port.

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