Metal 3D printing equipment with pre-gas-washing function of powder cleaning device

Abstract

The utility model provides metal 3D printing equipment with a pre-washing function of a powder cleaning device, which is provided with a forming device and the powder cleaning device, a second feeding and discharging door is arranged in the bottom of a powder cleaning chamber, a turning plate assembly is arranged in the powder cleaning chamber, and the turning plate assembly comprises a fixed support, a sealing plate and an air cylinder assembly. The sealing plate is rotationally connected with the fixed support through the rotating shaft assembly, the fixed end of the air cylinder assembly is rotationally connected with the second side wall of the powder cleaning cavity, and the output end of the air cylinder assembly is rotationally connected with the first end face of the sealing plate; when the metal 3D printing forming part is located in the forming cavity, the air cylinder assembly is in a top stretching state, the second end face of the sealing plate is attached to the second feeding and discharging door in a sealed mode, and pre-gas-washing operation is executed in the powder cleaning cavity; when the metal 3D printing forming part moves into the powder cleaning cavity, the air cylinder assembly is in a containing state, the second end face of the sealing plate is away from the second feeding and discharging door, and the powder cleaning cavity communicates with the external space of the powder cleaning device.

Description

Technical Field

[0001] This utility model belongs to the field of metal 3D printing technology, and in particular relates to a metal 3D printing device with a pre-washing function of a powder cleaning device. Background Technology

[0002] Metal 3D printing, also known as metal additive manufacturing, is an advanced manufacturing process that builds three-dimensional metal parts by adding materials layer by layer. This technology has wide applications in precision machining fields such as aerospace, automotive, medical, and mold making. It can be used to produce parts with complex geometries and achieves design freedom and performance optimization that is difficult to achieve with traditional manufacturing methods. During the metal 3D printing process, the initially printed metal 3D parts contain a large amount of dust in their internal cavities or joints. The cleanliness of this dust directly affects the quality of subsequent heat treatment processes and may also affect subsequent machining, surface treatment, and the performance and reliability of the final product. Because metal printing materials are often highly reactive metal powders, the dispersion and oxidation of these powders in air may form explosive mixtures, easily causing deflagration. Therefore, the dust removal operation for metal 3D printed parts must be carried out in an environment protected by inert gas.

[0003] In existing technology, the forming chamber and the powder cleaning chamber of conventional metal 3D printing equipment are set up independently. After the metal 3D printed part is printed and cooled in the forming chamber, it must first be moved into the powder cleaning chamber. Then, inert gas is injected into the powder cleaning chamber for purging. Only when the oxygen concentration in the powder cleaning chamber reaches the powder cleaning standard can the powder cleaning operation of the metal 3D printed part continue. Since the printing and cooling operation of the metal 3D printed part in the forming chamber cannot be performed simultaneously with the purging operation in the powder cleaning chamber, the overall operating efficiency of the metal 3D printing equipment is low. Utility Model Content

[0004] This utility model aims to provide a metal 3D printing device with a pre-washing function for powder cleaning, in order to solve the technical problem that conventional metal 3D printing devices under the prior art cannot simultaneously perform the printing and cooling operations of metal 3D printed parts in the forming chamber and the washing operation in the powder cleaning chamber.

[0005] To solve the above problems, the technical solution of this utility model is: a metal 3D printing device with a pre-washing function for powder cleaning, comprising:

[0006] A molding device, wherein a molding chamber is provided inside the molding device, and a first inlet / outlet gate is provided at the bottom of the molding chamber, the first inlet / outlet gate being used to connect the molding chamber to the external space of the molding device;

[0007] A powder cleaning device is provided, which is horizontally arranged in the same direction as the forming device. The powder cleaning device has a powder cleaning chamber inside. The powder cleaning chamber has a second inlet and outlet door in the bottom first side wall. The second inlet and outlet door is used to connect the powder cleaning chamber to the external space of the powder cleaning device.

[0008] The cleaning chamber is equipped with a flap assembly, which includes a fixed bracket, a sealing plate, and a cylinder assembly. The fixed bracket is fixed in the second side wall of the cleaning chamber, and a rotating shaft assembly is provided at the bottom of the fixed bracket. One side of the sealing plate is rotatably connected to the fixed bracket through the rotating shaft assembly. The sealing plate rotates around the rotating shaft assembly as its axis, with a rotation angle range of 0-90°. The fixed end of the cylinder assembly is rotatably connected to the second side wall of the cleaning chamber, and the output end of the cylinder assembly is rotatably connected to the first end face of the sealing plate.

[0009] When the 3D printed metal part is located in the forming chamber, the cylinder assembly is in the extended state, the second end face of the sealing plate is sealed and fitted with the second inlet / outlet door, and a pre-washing operation is performed in the powder cleaning chamber; when the 3D printed metal part moves into the powder cleaning chamber, the cylinder assembly is in the receiving state, the second end face of the sealing plate is away from the second inlet / outlet door, and the powder cleaning chamber is connected to the external space of the powder cleaning device.

[0010] Preferably, the fixed bracket includes a first fixed bracket and a second fixed bracket, and the rotating shaft assembly includes a rotating shaft body, a bearing and a connector. The two ends of the rotating shaft body are rotatably connected to the first fixed bracket and the second fixed bracket respectively through the bearing. The rotating shaft body passes through the connector, and the rotating shaft body is fixedly connected to the inner through hole of the connector. The outer mating surface of the connector is fixedly connected to the first end face of the sealing plate.

[0011] Preferably, the fixed bracket has a through groove extending along its length, and the extending surface of the groove is perpendicular to the second side wall of the powder cleaning chamber. The flap assembly also includes a connecting rod, a pin, and a connecting rod seat. The pin passes through the groove and the first end of the connecting rod. The first end of the connecting rod is slidably connected to the groove through the pin. The second end of the connecting rod is rotatably connected to the saddle of the connecting rod seat. The mating surface of the connecting rod seat is fixedly connected to the first end face of the sealing plate.

[0012] When the cylinder assembly is in the fully extended state, the first end of the connecting rod is located at the bottom end of the groove, and the sealing plate forms a 90° angle with the second side wall of the powder cleaning chamber. When the cylinder assembly is in the fully retracted state, the first end of the connecting rod is located at the top end of the groove, and the sealing plate is arranged parallel to the second side wall of the powder cleaning chamber.

[0013] Preferably, the flap assembly further includes a first connecting seat, a second connecting seat, a first swing head, and a second swing head. The support arm of the first connecting seat is rotatably connected to the swing groove of the first swing head, the support arm of the second connecting seat is rotatably connected to the swing groove of the second swing head, and the base of the first connecting seat is fixedly connected to the first end face of the sealing plate. The base of the first swing head is fixedly connected to the output end of the cylinder assembly, the base of the second connecting seat is fixedly connected to the second side wall of the powder cleaning chamber, and the base of the second swing head is fixedly connected to the fixed end of the cylinder assembly.

[0014] Preferably, the cylinder assembly includes a pneumatic cylinder and a hydraulic cylinder.

[0015] Preferably, the flap assembly further includes a stop block, a pin and a pin cylinder. The stop block is fixed to the first end face of the sealing plate. The stop block has a transverse slot on the side away from the sealing plate. The pin and the pin cylinder are fixed to the top of the bracket and are connected in a driving manner.

[0016] The stop block and the pin are configured such that when the cylinder assembly is in a fully received state, the stop block moves with the sealing plate to the movement range of the pin; when the pin cylinder drives the pin to move horizontally into the slot of the stop block, the relative position of the sealing plate and the second side wall of the cleaning chamber is locked; and when the pin cylinder drives the pin to move horizontally out of the slot of the stop block, the relative position of the sealing plate and the second side wall of the cleaning chamber is unlocked.

[0017] Preferably, a sealing strip is provided at the contact position between the second end face of the sealing plate and the second inlet / outlet door.

[0018] Preferably, the metal 3D printing equipment with the pre-washing function of the powder cleaning device further includes a loading and unloading station, which is used to install and level the substrate and receive the metal 3D printed parts.

[0019] Preferably, the metal 3D printing equipment with the pre-washing function of the powder cleaning device further includes a molded part transfer device, which is used to transport the metal 3D printed molded part or substrate along the conveying track to the loading and unloading station, the molding chamber or the powder cleaning chamber.

[0020] Preferably, the metal 3D printing equipment with the pre-washing function of the powder cleaning device further includes a frame assembly, and the conveying tracks of the loading and unloading station, the molding device, the powder cleaning device and the molding part transfer device are respectively fixed in the frame assembly.

[0021] Because of the adoption of the above technical solution, this utility model has the following advantages and positive effects compared with the prior art:

[0022] This invention provides a metal 3D printing device with a pre-washing function for a powder cleaning device. It includes a forming device and a powder cleaning device. The powder cleaning chamber inside the powder cleaning device has a flap assembly, which includes a fixed bracket, a sealing plate, and a cylinder assembly. The sealing plate is rotatably connected to the fixed bracket, and driven by the cylinder assembly, the sealing plate can efficiently open and close the inlet and outlet doors in the powder cleaning chamber. Therefore, in this invention, while the metal 3D printed part is undergoing printing or cooling operations in the forming chamber, the inlet and outlet doors in the powder cleaning chamber are closed by controlling the cylinder assembly, allowing the powder cleaning chamber to undergo pre-washing with inert gas. When the metal 3D printed part needs to be moved into the powder cleaning chamber, the inlet and outlet doors are opened by controlling the cylinder assembly. When the metal 3D printed part is completely moved into the powder cleaning chamber, the oxygen concentration inside the powder cleaning chamber has reached a low level, thereby reducing the washing time required after the metal 3D printed part enters the powder cleaning chamber and improving the overall operating efficiency of the metal 3D printing equipment. Attached Figure Description

[0023] Figure 1 This utility model provides a structural schematic diagram of a metal 3D printing device with a pre-washing air function and a powder cleaning device.

[0024] Figure 2 This utility model provides a schematic diagram of the powder cleaning device and the loading and unloading station.

[0025] Figure 3 A partial structural diagram of the powder cleaning device provided by this utility model;

[0026] Figure 4 A schematic diagram of the flip-plate assembly provided by this utility model;

[0027] Figure 5 This utility model provides a schematic diagram of the structure of the flap assembly when the cylinder assembly is in the receiving state.

[0028] Explanation of reference numerals in the attached drawings: 1: Molding device; 2: Powder cleaning device; 21: Powder cleaning chamber; 22: Second inlet / outlet gate; 23: Flip plate assembly; 2301: First fixed bracket; 2302: Second fixed bracket; 2303: Sealing plate; 2304: Cylinder assembly; 2305: Rotating shaft body; 2306: Bearing; 2307: Connecting piece; 2308: Groove; 2309: Connecting rod; 2310: Pin; 2311: Connecting rod seat; 2312: First connecting seat; 2313: First swing head; 2314: Stop block; 2315: Pin part; 2316: Pin cylinder; 24: Sealing strip; 3: Loading / unloading station; 31: Loading / unloading port; 4: Molded part transfer device; 41: Conveying track; 5: Frame assembly. Detailed Implementation

[0029] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a metal 3D printing device with a pre-washing function for powder cleaning. The advantages and features of this invention will become clearer from the following description and claims.

[0030] See Figures 1 to 5 This embodiment provides a metal 3D printing device with a pre-washing function of a powder cleaning device, which can simultaneously perform the printing cooling operation of the metal 3D printed part in the forming device 1 and the inert gas washing operation in the powder cleaning device 2.

[0031] Specifically, the molding device 1 has a molding chamber inside, and a first inlet / outlet gate is opened at the bottom of the molding chamber. The first inlet / outlet gate is used to connect the molding chamber to the external space of the molding device 1. In this embodiment, the interior of the molding chamber is used to perform the printing and cooling operations of the metal 3D printed parts.

[0032] The powder cleaning device 2 and the forming device 1 are set horizontally in the same direction to facilitate the rapid and stable transfer of the subsequent metal 3D printed parts. The powder cleaning device 2 is provided with a powder cleaning chamber 21. The powder cleaning chamber 21 has a second inlet and outlet door 22 in its bottom first side wall. The second inlet and outlet door 22 is used to connect the powder cleaning chamber 21 to the external space of the powder cleaning device 2. In this embodiment, the powder cleaning chamber 21 is used to perform the powder removal operation of the metal 3D printed parts.

[0033] The cleaning chamber 21 is equipped with a flap assembly 23, which includes a fixed bracket, a sealing plate 2303, and a cylinder assembly 2304. The fixed bracket is fixed in the second side wall of the cleaning chamber 21. The second side wall of the cleaning chamber 21 refers to any vertically arranged side wall in the cleaning chamber 21. The bottom of the fixed bracket is equipped with a rotating shaft assembly. The rotating shaft assembly is arranged in the same direction as the intersection line of the first side wall and the second side wall in the cleaning chamber 21. The side of the sealing plate 2303 near the second side wall of the cleaning chamber 21 is rotatably connected to the fixed bracket through the rotating shaft assembly. The sealing plate 2303 rotates around the rotating shaft assembly as the axis of rotation. The rotation angle range of the sealing plate 2303 is 0-90°. The fixed end of the cylinder assembly 2304 is rotatably connected to the second side wall of the powder cleaning chamber 21, and the output end of the cylinder assembly 2304 is rotatably connected to the first end face of the sealing plate 2303. The first end face of the sealing plate 2303 refers to the end face of the sealing plate 2303 facing the second side wall of the powder cleaning chamber 21.

[0034] In this embodiment, when the metal 3D printed part is located in the molding chamber and is performing a metal 3D printing operation or a heat dissipation and cooling operation after printing, the cylinder assembly 2304 can be controlled to be in the extended state, that is, the output end of the cylinder assembly 2304 extends outward, thereby driving the sealing plate 2303 to rotate around the rotating shaft assembly as the rotation axis, away from the second side wall of the powder cleaning chamber 21, until the sealing plate 2303 and the second side wall of the powder cleaning chamber 21 form a 90° angle. At this time, the second end face of the sealing plate 2303 is sealed and fitted with the second inlet and outlet gate 22. Inert gas can be pre-introduced into the powder cleaning chamber 21 to perform a pre-washing operation and reduce the oxygen content in the powder cleaning chamber 21. The second end face of the sealing plate 2303 refers to the end face of the sealing plate 2303 away from the second side wall of the powder cleaning chamber 21. When the 3D printed metal part is ready to be moved into the cleaning chamber 21, the cylinder assembly 2304 can be controlled to be in a receiving state, that is, the output end of the cylinder assembly 2304 retracts inward, thereby driving the sealing plate 2303 to rotate around the rotating shaft assembly as the axis, approaching the second side wall of the cleaning chamber 21, until the sealing plate 2303 is parallel to the second side wall of the cleaning chamber 21. At this time, the second end face of the sealing plate 2303 moves away from the second inlet / outlet gate 22, the second inlet / outlet gate 22 opens, and the cleaning chamber 21 is connected to the external space of the cleaning device 2. The 3D printed metal part can be moved into the cleaning chamber 21 through the second inlet / outlet gate 22. At this time, since the pre-washing operation has been performed in the cleaning chamber 21, the oxygen content in the cleaning chamber 21 is in a low state, and it is not necessary to perform the washing operation again, or a small amount of inert gas can be introduced to make the oxygen content in the cleaning chamber 21 meet the specified requirements. Therefore, through this embodiment, the pre-washing operation of the powder cleaning chamber 21 can effectively improve the overall operating efficiency of the metal 3D printing equipment.

[0035] It is worth noting that in this embodiment, the inert gas is preferably a gas with a mass less than that of oxygen, such as helium or argon. After the pre-washing operation is performed in the powder cleaning chamber 21, the second inlet / outlet door 22 is opened. During the process of the metal 3D printed part being moved into the powder cleaning chamber 21, since the second inlet / outlet door 22 is located at the bottom of the powder cleaning chamber 21, it can effectively prevent a large amount of inert gas from escaping from the powder cleaning chamber 21 and oxygen from entering the powder cleaning chamber 21.

[0036] The specific structure and function of a metal 3D printing device with a pre-washing function for powder cleaning provided in this embodiment will be described in further detail below:

[0037] Preferably, in this embodiment, the fixed bracket includes a first fixed bracket 2301 and a second fixed bracket 2302, which are respectively vertically arranged in the second side wall of the powder cleaning chamber 21. The rotating shaft assembly includes a rotating shaft body 2305, a bearing 2306, and a connector 2307. The two ends of the rotating shaft body 2305 are rotatably connected to the bearing seats at the bottom of the first fixed bracket 2301 and the second fixed bracket 2302 through the bearings 2306, respectively. At the same time, the connector 2307 is provided through the middle section of the rotating shaft body 2305. The rotating shaft body 2305 is fixedly connected to the inner through hole of the connector 2307, and the outer mating surface of the connector 2307 is fixedly connected to the first end face of the sealing plate 2303, thereby realizing a stable rotating connection between the sealing plate 2303 and the fixed bracket.

[0038] Preferably, in this embodiment, the fixing bracket is an L-shaped folded edge structure. The first folded edge of the fixing bracket is attached to the second side wall of the powder cleaning chamber 21 and is fixedly connected by a bolt assembly. The second folded edge of the fixing bracket is perpendicular to the second side wall of the powder cleaning chamber 21. In the second folded edge of the fixing bracket, there is a groove 2308 extending along the length of the fixing bracket, that is, the extension surface of the groove 2308 is perpendicular to the second side wall of the powder cleaning chamber 21. The flap assembly 23 also includes a connecting rod 2310, a pin 2310 and 2311. The first end of the connecting rod 2310 is located on the side of the groove 2308, and the pin 2310 passes through the groove 2308 and the first end of the connecting rod 2310 in sequence. Therefore, the first end of the connecting rod 2310 is slidably connected to the groove 2308 through the pin 2310. The second end of the connecting rod 2310 and the saddle of 2311 can also be rotatably connected through a rotating shaft. The mating surface of 2311 is fixedly connected to the first end face of the sealing plate 2303.

[0039] In this embodiment, when the cylinder assembly 2304 is in the fully extended state, the first end of the connecting rod 2310 moves to the bottom end of the tank 2308. At this time, the connecting rod 2310 pulls the sealing plate 2303, so that the maximum angle between the sealing plate 2303 and the second side wall of the cleaning chamber 21 is 90°. When the cylinder assembly 2304 is gradually brought into place, the sealing plate 2303 is pulled by the cylinder assembly 2304 and moves closer to the second side wall of the cleaning chamber 21 with the rotating shaft assembly as the rotation axis. At this time, the first end of the connecting rod 2310 moves toward the top of the tank 2308. When the cylinder assembly 2304 is in the fully retracted state, the first end of the connecting rod 2310 moves to the top of the tank 2308. At this time, the sealing plate 2303 and the second side wall of the cleaning chamber 21 are arranged in parallel. Therefore, in this embodiment, the maximum rotation angle of the sealing plate 2303 can be limited by the relative position between the first end of the connecting rod 2310 and the groove 2308, thereby efficiently controlling the second end face of the sealing plate 2303 to achieve a sealed fit with the second inlet / outlet gate 22, and forming a channel for conveying metal 3D printed parts between the sealing plate 2303 and the second inlet / outlet gate 22.

[0040] Preferably, in this embodiment, the flap assembly 23 further includes a first connecting seat 2312, a second connecting seat, a first swing head 2313, and a second swing head. The support arm of the first connecting seat 2312 and the swing groove of the first swing head 2313 can be rotatably connected by a rotating shaft. The support arm of the second connecting seat and the swing groove of the second swing head can be rotatably connected by a rotating shaft. The base of the first connecting seat 2312 is fixedly connected to the first end face of the sealing plate 2303. The base of the first swing head 2313 is fixedly connected to the output end of the cylinder assembly 2304. The base of the second connecting seat is fixedly connected to the second side wall of the powder cleaning chamber 21. The base of the second swing head is fixedly connected to the fixed end of the cylinder assembly 2304. Thus, the output end of the cylinder assembly 2304 and the sealing plate 2303 are rotatably connected, and the fixed end of the cylinder assembly 2304 and the second side wall of the powder cleaning chamber 21 are rotatably connected.

[0041] Preferably, in this embodiment, the cylinder assembly 2304 includes pneumatic cylinders and hydraulic cylinders, which are used to provide a power source for the rotation of the sealing plate 2303.

[0042] Preferably, in this embodiment, the flap assembly 23 further includes a stop block 2314, a pin 2315 and a pin cylinder 2316. The stop block 2314 is fixed to the first end face of the sealing plate 2303. The stop block 2314 is provided with a transverse slot on the side away from the sealing plate 2303. The slot forms a groove on the side of the stop block 2314 away from the sealing plate 2303. Taking the slot with a columnar structure as an example, the maximum diameter of the slot is greater than the width of the groove. The pin 2315 and the pin cylinder 2316 are fixed on the top of the bracket. The pin 2315 and the pin cylinder 2316 are connected by a transmission. The pin cylinder 2316 can drive the pin 2315 to move horizontally. The side of the pin 2315 facing away from the second side wall of the powder cleaning chamber 21 has an extended protrusion. The protrusion is preferably spherical. The maximum diameter of the protrusion is smaller than the maximum diameter of the slot, but larger than the width of the slot. The diameter of the connection point between the protrusion and the pin 2315 is smaller than the width of the slot.

[0043] In this embodiment, when the cylinder assembly 2304 is in the fully received state, the stop block 2314 moves with the sealing plate 2303 into the moving range of the pin 2315, that is, the slot of the stop block 2314 is located in the movable path of the protrusion of the pin 2315. When the pin cylinder 2316 drives the protrusion of the pin 2315 to move horizontally into the slot of the stop block 2314, the protrusion of the pin 2315 and the slot of the stop block 2314 are perpendicular in the vertical direction of the second side wall of the powder cleaning chamber 21. In the engaged state, the relative position of the sealing plate 2303 and the second sidewall of the powder cleaning chamber 21 is locked, meaning the sealing plate 2303 cannot rotate. When the pin cylinder 2316 drives the protrusion of the pin 2315 to move horizontally out of the slot of the stop block 2314, the protrusion of the pin 2315 disengages from the slot of the stop block 2314, thus unlocking the relative position of the sealing plate 2303 and the second sidewall of the powder cleaning chamber 21. This allows the sealing plate 2303 to rotate again under the driving action of the cylinder assembly 2304. In this embodiment, the stop block 2314 and the pin 2315 further ensure that the sealing plate 2303 remains stationary when the cylinder assembly 2304 is in the fully contained state, preventing accidental detachment of the sealing plate 2303 and potential damage to the metal 3D printed part placed in the powder cleaning chamber 21.

[0044] Preferably, in this embodiment, a sealing strip 24 is provided at the contact position between the second end face of the sealing plate 2303 and the second inlet / outlet door 22, which is used to improve the sealing performance when the second end face of the sealing plate 2303 is in contact with the second inlet / outlet door 22 and prevent the escape of inert gas.

[0045] Preferably, in this embodiment, the metal 3D printing equipment further includes a loading and unloading station 3. The loading and unloading station 3 is set horizontally in the same direction as the powder cleaning device 2 and the forming device 1. The loading and unloading station 3 is used to install and level the substrate of the metal 3D printed part before the metal 3D printing operation, and to receive the metal 3D printed part after the powder cleaning operation of the metal 3D printed part. On the table of the loading and unloading station 3, there is a loading and unloading port 31, which is used to connect the loading and unloading station 3 to its bottom space.

[0046] Preferably, in this embodiment, the metal 3D printing equipment further includes a part transfer device 4 and a conveying track 41. The conveying track 41 extends into the vertical bottom space of the loading / unloading station 3, the powder cleaning device 2, and the forming device 1. The part transfer device 4 can move horizontally along the conveying track 41. In the metal 3D printing process, the part transfer device 4 can first stop below the loading / unloading station 3, with the loading platform at the top of the part transfer device 4 aligned with the loading / unloading port 31. In the loading / unloading station 3, the substrate of the metal 3D printed part is leveled and installed on the loading platform of the part transfer device 4. Then, the part transfer device 4 adjusts its height and moves horizontally to transport the substrate to below the forming device 1, with the loading platform of the part transfer device 4 aligned with the first inlet / outlet gate. Then, the part transfer device 4 adjusts its height to completely send the substrate into the forming chamber. After completing the metal 3D printing operation, the part transfer device 4 adjusts its height to remove the metal 3D printed part from the forming chamber and water... The metal 3D printed part is moved horizontally to be conveyed to the area below the powder cleaning device 2, and the loading platform of the part transfer device 4 is aligned with the second inlet / outlet gate 22. Then, the part transfer device 4 adjusts its height to completely send the metal 3D printed part into the powder cleaning chamber 21. After completing the powder cleaning operation of the metal 3D printed part, the part transfer device 4 adjusts its height to move the metal 3D printed part out of the powder cleaning chamber 21 and moves horizontally to convey the metal 3D printed part to the area below the loading / unloading station 3, and the loading platform of the part transfer device 4 is aligned with the loading / unloading port 31. Finally, the part transfer device 4 adjusts its height to move the metal 3D printed part into the loading / unloading station 3 through the loading / unloading port 31.

[0047] Preferably, in this embodiment, the metal 3D printing equipment further includes a frame assembly 5, and the conveying tracks 41 of the loading and unloading station 3, the molding device 1, the powder cleaning device 2 and the molding part transfer device 4 are respectively fixed in the frame assembly 5 to achieve position locking and ensure the positional accuracy of the molding part transfer device 4 in conveying the substrate and the metal 3D printed molding part.

[0048] The following will describe the overall operation process of a metal 3D printing device with a pre-washing function for powder cleaning provided in this embodiment:

[0049] S1: Adjust the molded part transfer device 4 to move below the loading / unloading station 3, and align the loading platform of the molded part transfer device 4 with the loading / unloading port 31. Adjust the height of the molded part transfer device 4 so that the loading platform of the molded part transfer device 4 and the table surface of the loading / unloading station 3 are at the same level. Install the substrate of the metal 3D printed molded part on the loading platform of the molded part transfer device 4 and level the substrate to complete the substrate loading process.

[0050] S2: Adjust the height of the molding part transfer device 4 so that the substrate moves vertically downward a preset distance along with the loading platform of the molding part transfer device 4. Then adjust the molding part transfer device 4 to move horizontally along the conveying track 41 to below the molding device 1, and align the loading platform of the molding part transfer device 4 with the first inlet and outlet gate. Adjust the height of the molding part transfer device 4 so that the substrate moves vertically upward a preset distance along with the loading platform of the molding part transfer device 4 until the substrate is completely inside the molding chamber, and perform metal 3D printing in the molding chamber.

[0051] S3: After the metal 3D printing operation is completed, the metal 3D printed part is kept stationary in the molding chamber for a preset time to achieve heat dissipation and cooling of the metal 3D printed part.

[0052] S4: While performing metal 3D printing and heat dissipation cooling of the metal 3D printed parts in the molding device 1, in the powder cleaning device 2, the cylinder assembly 2304 is adjusted to be in a fully extended state, thereby driving the sealing plate 2303 to rotate away from the second side wall of the powder cleaning chamber 21 with the rotating shaft assembly as the rotation axis, so that the second end face of the sealing plate 2303 is sealed and fitted with the second inlet / outlet gate 22. Then, inert gas is pre-introduced into the powder cleaning chamber 21 to realize the pre-washing operation of the powder cleaning chamber 21.

[0053] S5: After the heat dissipation and cooling operation of the metal 3D printed part and the pre-washing operation of the powder cleaning chamber 21 are completed, adjust the height of the part transfer device 4 so that the metal 3D printed part moves vertically downward a preset distance along the loading platform of the part transfer device 4. Then adjust the part transfer device 4 to move horizontally along the conveying track 41 to below the powder cleaning device 2, and align the loading platform of the part transfer device 4 with the second inlet and outlet gate 22.

[0054] S6: Adjust the cylinder assembly 2304 to be in a fully contained state, thereby driving the sealing plate 2303 to rotate around the shaft assembly as the axis of rotation, and move it close to the second side wall of the powder cleaning chamber 21, so that the second end face of the sealing plate 2303 is away from the second inlet / outlet gate 22. The sealing plate 2303 and the second side wall of the powder cleaning chamber 21 are arranged in parallel. The second inlet / outlet gate 22 is opened. Then, adjust the height of the molding part transfer device 4. The metal 3D printed molding part moves vertically upward a preset distance with the loading platform of the molding part transfer device 4 until the metal 3D printed molding part is completely entered into the powder cleaning chamber 21. According to the current oxygen content in the powder cleaning chamber 21, a small amount of inert gas is replenished into the powder cleaning chamber 21. Finally, the dust removal operation of the metal 3D printed molding part is performed in the powder cleaning chamber 21.

[0055] S7: After the dust removal operation of the metal 3D printed part is completed, adjust the height of the part transfer device 4 so that the metal 3D printed part moves vertically downward a preset distance along the loading platform of the part transfer device 4. Then adjust the part transfer device 4 to move horizontally along the conveying track 41 to below the loading and unloading station 3, and align the loading platform of the part transfer device 4 with the loading and unloading port 31. Adjust the height of the part transfer device 4 again so that the metal 3D printed part moves vertically upward a preset distance along the loading platform of the part transfer device 4, so that the loading platform of the part transfer device 4 and the table surface of the loading and unloading station 3 are at the same horizontal height. Finally, take out the metal 3D printed part from the loading and unloading station 3 to complete the unloading process of the metal 3D printed part.

[0056] In summary, this embodiment provides a metal 3D printing device with a pre-washing function for the powder cleaning device. It includes a forming device 1 and a powder cleaning device 2. The powder cleaning chamber 21 inside the powder cleaning device 2 is equipped with a flap assembly 23. The flap assembly 23 includes a fixed bracket, a sealing plate 2303, and a cylinder assembly 2304. The sealing plate 2303 is rotatably connected to the fixed bracket, and under the drive of the cylinder assembly 2304, the sealing plate 2303 can efficiently open and close the second inlet / outlet gate 22 in the powder cleaning chamber 21. Therefore, in this embodiment, while the metal 3D printed part is performing metal 3D printing or heat dissipation cooling operations in the forming chamber, the cylinder assembly can be controlled... The component 2304 closes the second inlet / outlet gate 22 in the powder cleaning chamber 21. The powder cleaning chamber 21 is pre-washed with inert gas. When the metal 3D printed part needs to be moved into the powder cleaning chamber 21, the second inlet / outlet gate 22 in the powder cleaning chamber 21 is opened by controlling the cylinder assembly 2304. When the metal 3D printed part is completely moved into the powder cleaning chamber 21, the oxygen concentration inside the powder cleaning chamber 21 has reached a low state, thereby reducing the time required for the washing operation after the metal 3D printed part is moved into the powder cleaning chamber 21. This makes the metal 3D printing process more continuous and smooth, reduces the waiting time between each process, and improves the overall operating efficiency of the metal 3D printing equipment.

[0057] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they shall still fall within the protection scope of the present invention.

Claims

1. A metal 3D printing apparatus having a powder cleaning device pre-washing gas function, characterized by, The utility model relates to a metal 3D printing forming device, including: a forming device, which is internally provided with a forming chamber, and a first inlet and outlet door is arranged at the bottom of the forming chamber to connect the forming chamber with the outside space of the forming device; a powder cleaning device, which is horizontally arranged in the same direction as the forming device, and is internally provided with a powder cleaning chamber, and a second inlet and outlet door is arranged at the first sidewall of the bottom of the powder cleaning chamber to connect the powder cleaning chamber with the outside space of the powder cleaning device; the powder cleaning chamber is internally provided with a flap assembly, which includes a fixed support, a sealing plate and a cylinder assembly, the fixed support is fixedly arranged in the second sidewall of the powder cleaning chamber, the bottom of the fixed support is provided with a rotating shaft assembly, one side of the sealing plate is rotatably connected with the fixed support through the rotating shaft assembly, the sealing plate rotates around the rotating shaft assembly as the rotating shaft, and the rotating angle range of the sealing plate is 0-90 degrees; the fixed end of the cylinder assembly is rotatably connected with the second sidewall of the powder cleaning chamber, and the output end of the cylinder assembly is rotatably connected with the first end surface of the sealing plate; when the metal 3D printing forming piece is located in the forming chamber, the cylinder assembly is in the fully extended state, the second end surface of the sealing plate is in sealing contact with the second inlet and outlet door, and the pre-washing operation is performed in the powder cleaning chamber; when the metal 3D printing forming piece moves into the powder cleaning chamber, the cylinder assembly is in the fully retracted state, the second end surface of the sealing plate is away from the second inlet and outlet door, and the powder cleaning chamber is connected with the outside space of the powder cleaning device. 2.The metal 3D printing device with a powder cleaning device pre-washing gas function of claim 1, wherein, the fixed support includes a first fixed support and a second fixed support, the rotating shaft assembly includes a rotating shaft body, a bearing and a connecting piece, the two ends of the rotating shaft body are rotatably connected with the first fixed support and the second fixed support through the bearing, the rotating shaft body penetrates the connecting piece, and the rotating shaft body is fixedly connected with the inner through hole of the connecting piece, and the outer joint surface of the connecting piece is fixedly connected with the first end surface of the sealing plate. 3.The metal 3D printing device with a powder cleaning device pre-washing gas function of claim 1, wherein, a groove is arranged in the fixed support along the length direction of the fixed support, and the extension surface of the groove is perpendicular to the second sidewall of the powder cleaning chamber, the flap assembly further includes a connecting rod, a pin shaft and a connecting rod seat, the pin shaft penetrates the groove and the first end of the connecting rod, the first end of the connecting rod is slidably connected with the groove through the pin shaft, the second end of the connecting rod is rotatably connected with the saddle of the connecting rod seat, and the joint surface of the connecting rod seat is fixedly connected with the first end surface of the sealing plate; when the cylinder assembly is in the fully extended state, the first end of the connecting rod is located at the bottom end of the groove, and the sealing plate and the second sidewall of the powder cleaning chamber form a 90 degree angle, when the cylinder assembly is in the fully retracted state, the first end of the connecting rod is located at the top end of the groove, and the sealing plate and the second sidewall of the powder cleaning chamber are arranged in parallel. 4.The metal 3D printing device with a powder cleaning device pre-washing gas function of claim 1, wherein, The turning plate assembly further comprises a first connecting seat, a second connecting seat, a first swing head and a second swing head, the supporting arm of the first connecting seat is rotationally connected with the swing groove of the first swing head, the supporting arm of the second connecting seat is rotationally connected with the swing groove of the second swing head, the base of the first connecting seat is fixedly connected with the first end surface of the sealing plate, the base of the first swing head is fixedly connected with the output end of the cylinder assembly, the base of the second connecting seat is fixedly connected with the second side wall of the powder cleaning chamber, and the base of the second swing head is fixedly connected with the fixed end of the cylinder assembly. 5.The metal 3D printing device with a powder cleaning device pre-washing gas function of claim 4, wherein, The cylinder assembly comprises a pneumatic cylinder and a hydraulic cylinder. 6.The metal 3D printing device with a powder cleaning device pre-washing gas function of claim 1, wherein, The turning plate assembly further comprises a stop block, a latch and a latch cylinder, the stop block is fixedly arranged on the first end surface of the sealing plate, the side of the stop block away from the sealing plate is provided with a transverse insertion slot, the latch and the latch cylinder are fixedly arranged on the top of the bracket, and the latch and the latch cylinder are in transmission connection. The stop block and the latch are configured to, when the cylinder assembly is in a fully accommodated state, the stop block moves into the movement range of the latch along with the sealing plate, when the latch cylinder drives the latch to horizontally move into the insertion slot of the stop block, the relative position between the sealing plate and the second side wall of the powder cleaning chamber is locked, and when the latch cylinder drives the latch to horizontally move out of the insertion slot of the stop block, the relative position between the sealing plate and the second side wall of the powder cleaning chamber is unlocked. 7.The metal 3D printing apparatus with a powder cleaning device pre-washing gas function of claim 1, wherein, The contact position between the second end surface of the sealing plate and the second inlet and outlet door is provided with a sealing rubber strip. 8.The metal 3D printing apparatus with a powder cleaning device pre-washing gas function of claim 1, wherein, Further comprising a feeding and discharging station, the feeding and discharging station is used for mounting a leveling base plate and receiving a metal 3D printing forming piece. 9.The metal 3D printing apparatus with a powder cleaning device pre-washing gas function of claim 8, wherein, Further comprising a forming piece conveying device, the forming piece conveying device is used for conveying the metal 3D printing forming piece or the base plate along a conveying track to the feeding and discharging station, the forming chamber or the powder cleaning chamber. 10.The metal 3D printing device with a powder cleaning device pre-washing gas function of claim 9, wherein, Further comprising a frame assembly, the feeding and discharging station, the forming device, the powder cleaning device and the conveying track of the forming piece conveying device are respectively fixedly arranged in the frame assembly.

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