Sealing structure of cavity and metal powder additive manufacturing equipment

Abstract

The invention discloses a sealing structure of a cavity and metal powder additive manufacturing equipment, and relates to the technical field of metal powder additive manufacturing equipment. The sealing structure comprises a sealing cover plate and a driving mechanism, the sealing cover plate is movably arranged in the printing cavity, when the sealing cover plate is in an initial state, the sealing cover plate is located at the position away from the communicating opening, and when the sealing cover plate is in a sealing state, the sealing cover plate blocks the communicating opening. The driving mechanism can drive the sealing cover plate to be switched between the initial state and the sealing state, after manufacturing of the workpiece is completed, the workpiece is separated from the printing cavity, the sealing cover plate is switched from the initial state to the sealing state, the printing cavity is sealed, and when printing is started again, the forming cavity and the printing cavity are in butt joint, and the oxygen content in the forming cavity and the oxygen content in the printing cavity only slightly rise. And direct printing or printing after short deoxidization can be carried out, so that the inerting gas washing time and the quantity of inert gas are reduced, the time waste is avoided, the utilization rate is ensured, and the production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of metal powder additive manufacturing equipment technology, and in particular to a cavity sealing structure and metal powder additive manufacturing equipment. Background Technology

[0002] In the metal powder additive manufacturing industry, two cavities (the upper part of the piston plate in the printing cavity and the forming cavity) are usually connected before printing to form a whole sealed cavity space. The cavity is then cleaned by filling it with inert gas to replace the gas inside, thereby reducing the overall oxygen content of the cavity and preventing the parts printed from metal powder from being oxidized by oxygen during the printing process, which would cause defects in the printed products.

[0003] During continuous manufacturing, after each printing cycle, the forming cavity is removed for powder cleaning and part removal. At this time, the printing cavity is exposed to the air, and the oxygen content inside the cavity rises rapidly to the same level as the atmosphere. When printing restarts, the forming cavity is reassembled, and the connected overall space (the upper part of the piston plate of the printing cavity and the forming cavity) is inerted and purged. Since inert gas needs to be continuously injected to replace and purge the cavity, the entire inerting and purging process consumes a large amount of inert gas and takes up a lot of time, resulting in a significant waste of time and affecting the utilization rate.

[0004] Therefore, there is an urgent need for a cavity sealing structure and metal powder additive manufacturing equipment to solve the above problems. Summary of the Invention

[0005] The first objective of this invention is to provide a sealing structure for a cavity to solve the problems in the prior art that in the additive manufacturing process, a large amount of inert gas is consumed, a large amount of time is occupied, resulting in a large amount of wasted time and affecting the utilization rate.

[0006] The second objective of this invention is to provide a metal powder additive manufacturing equipment that ensures the uptime of the metal powder additive manufacturing equipment and improves production efficiency.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] A sealing structure for a cavity, the cavity including a printing cavity and a forming cavity, the printing cavity and the forming cavity having a communication port, the sealing structure being installed inside the printing cavity, characterized in that the sealing structure includes:

[0009] A sealing cover plate is movably disposed within the printing cavity, and the sealing cover plate has an initial state and a sealed state. When the sealing cover plate is in the initial state, the sealing cover plate is located away from the communication port, and the printing cavity and the forming cavity are connected. When the sealing cover plate is in the sealed state, the sealing cover plate blocks the communication port to seal the printing cavity.

[0010] A drive mechanism is installed inside the printing cavity, and the drive mechanism is capable of driving the sealing cover to switch between the initial state and the sealed state.

[0011] Furthermore, an inflatable sealing ring is fitted around the outer periphery of the sealing cover, and both the outer periphery of the sealing cover and the sidewall of the communication port can abut against the inflatable sealing ring.

[0012] Furthermore, the driving mechanism includes a mounting plate, a lifting assembly, and a rotating assembly. The mounting plate is fixed to the inner wall of the printing cavity. The lifting assembly is mounted on the mounting plate and can move relative to the mounting plate. The rotating assembly is connected to the lifting assembly in a transmission manner. The lifting assembly can drive the rotating assembly to move. The output end of the rotating assembly is connected to the sealing cover plate.

[0013] Furthermore, the lifting assembly includes a drive component and a slide table. The drive component is mounted on the mounting plate, and the drive end of the drive component is connected to the slide table. The rotating assembly is mounted on the slide table, and the drive component can drive the slide table to move.

[0014] Furthermore, the rotating assembly includes a first rotating member, a first connecting rod, a second rotating member, a second connecting rod, and a third rotating member. The first rotating member is mounted on the slide table, one end of the first connecting rod is connected to the first rotating member, the second rotating member is mounted on the other end of the first connecting rod, one end of the second connecting rod is connected to the second rotating member, the third rotating member is mounted on the other end of the second connecting rod, and the sealing cover is connected to the third rotating member.

[0015] Furthermore, the drive mechanism also includes a guide rail and a guide plate. The guide plate is connected to the mounting plate, and the guide rail is mounted on the guide plate. A guide groove is provided on the side of the slide away from the lifting assembly, and the guide groove slides in cooperation with the guide rail.

[0016] Furthermore, the slide table has multiple guide grooves on the side opposite to the lifting assembly, and the guide plate is equipped with multiple guide rails, with each of the multiple guide grooves corresponding to one of the multiple guide rails.

[0017] Furthermore, there are two rotating components, and the driving component is located between the two first rotating components.

[0018] Furthermore, the side of the sealing cover away from the drive mechanism is planar.

[0019] A metal powder additive manufacturing apparatus includes a printing cavity and a forming cavity. The metal powder additive manufacturing apparatus also includes a sealing structure for the cavity, the sealing structure being located within the printing cavity.

[0020] The beneficial effects of this invention are:

[0021] This invention provides a sealing structure for a cavity, comprising a printing cavity and a forming cavity, with a communication port between them. The sealing structure is installed within the printing cavity and includes a sealing cover plate and a driving mechanism. The sealing cover plate is movably disposed within the printing cavity and has an initial state and a sealed state. When the sealing cover plate is in the initial state, it is located away from the communication port, and the printing cavity and forming cavity are connected. When the sealing cover plate is in the sealed state, it blocks the communication port to seal the printing cavity. The driving mechanism is installed within the printing cavity and can drive the sealing cover plate to switch between the initial state and the sealed state. During operation, when manufacturing the workpiece, the sealing cover is in its initial state, located away from the connection port. At this time, the printing cavity and the forming cavity are connected. After the workpiece is manufactured, it is removed from the printing cavity. At this point, the sealing cover can switch from its initial state to a sealed state, sealing the printing cavity and ensuring that the oxygen content inside the printing cavity remains at its original low oxygen level. When printing resumes, the reassembled forming cavity aligns with the printing cavity. At this time, the sealing cover switches from its sealed state back to its initial state, connecting the forming cavity and the printing cavity, restoring them to a complete and sealed cavity with only a slight increase in oxygen content. Printing can then begin directly or after a brief deoxygenation process, reducing the time required for inerting and purging, decreasing the amount of inert gas needed, avoiding wasted time, ensuring uptime, and improving production efficiency.

[0022] This invention also provides a metal powder additive manufacturing apparatus, including a printing cavity and a forming cavity. The apparatus further includes a sealing structure for the aforementioned cavities, located within the printing cavity. During workpiece manufacturing, the sealing cover is in its initial state, positioned away from the connection port. At this time, the printing cavity and the forming cavity are in communication. After workpiece manufacturing is completed, the workpiece detaches from the printing cavity. The sealing cover can then switch from its initial state to a sealed state, sealing the printing cavity and ensuring the oxygen content remains at its original low level. When printing resumes, the reassembled forming cavity aligns with the printing cavity. The sealing cover then switches from its sealed state back to its initial state, restoring communication between the forming cavity and the printing cavity, creating a complete and sealed cavity with only a slight increase in oxygen content. Printing can then begin directly or after a brief deoxygenation process, reducing inerting and purging time, decreasing the amount of inert gas required, avoiding wasted time, ensuring the uptime of the metal powder additive manufacturing apparatus, and improving production efficiency. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of a cavity sealing structure provided in an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the sealing structure of a cavity provided in an embodiment of the present invention from another perspective;

[0026] Figure 3 This is a schematic diagram of the sealing structure of a cavity provided in an embodiment of the present invention, located within the cavity.

[0027] In the picture:

[0028] 1. Sealing cover plate; 11. Inflatable sealing ring; 2. Drive mechanism; 21. Mounting plate; 22. Lifting assembly; 221. Drive component; 222. Slide table; 23. Rotating assembly; 231. First rotating component; 232. First connecting rod; 233. Second rotating component; 234. Second connecting rod; 235. Third rotating component; 236. Connecting component; 24. Guide rail; 25. Guide plate; 100. Printing cavity; 200. Forming cavity. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0030] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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 or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0033] This embodiment provides a sealing structure for the cavity, which can reduce the time for inerting and washing, reduce the amount of inert gas required, avoid wasting time, ensure uptime, and improve production efficiency.

[0034] It should be noted that in the additive manufacturing industry, during workpiece printing, a sealed cavity is formed within the metal powder additive manufacturing equipment. The cavity is purged by filling it with inert gas to replace the existing gas, thereby reducing the overall oxygen content and preventing oxidation of the printed parts during the printing process, thus avoiding defects in the printed product. This cavity includes a printing cavity and a forming cavity, which are connected by a connecting port. A sealing structure is installed within the printing cavity, and a piston plate that moves up and down along the height of the forming cavity is located within the forming cavity. After the workpiece manufacturing is completed, the forming cavity detaches from the printing cavity, and the workpiece is extracted. In this embodiment, the workpiece is an additively manufactured part, formed using metal powder printing, and the inert gas can be argon.

[0035] like Figures 1-3 As shown, in this embodiment, the sealing structure includes a sealing cover plate 1 and a driving mechanism 2. The sealing cover plate 1 is movably disposed within the printing cavity 100 and has an initial state and a sealed state. When the sealing cover plate 1 is in the initial state, it is located away from the communication opening, and the printing cavity 100 and the forming cavity 200 are connected. When the sealing cover plate 1 is in the sealed state, it blocks the communication opening to seal the printing cavity 100. The driving mechanism 2 is installed within the printing cavity 100 and can drive the sealing cover plate 1 to switch between the initial state and the sealed state. During operation, when manufacturing the workpiece, the sealing cover 1 is in its initial state, located away from the connection port. At this time, the printing cavity 100 and the forming cavity 200 are in communication. After the workpiece is manufactured, it is removed from the printing cavity 100. At this time, the sealing cover 1 can switch from its initial state to a sealed state, and the printing cavity 100 is sealed, ensuring that the oxygen content in the printing cavity 100 remains at its original low oxygen content state. When printing restarts, the reassembled forming cavity 200 connects with the printing cavity 100. At this time, the sealing cover 1 switches from its sealed state to its initial state, and the forming cavity 200 and the printing cavity 100 are connected, restoring a complete and sealed cavity. The oxygen content in the cavity only increases slightly, allowing printing to start directly or after a short period of deoxygenation. This reduces the time required for inerting and purging, reduces the amount of inert gas needed, avoids wasting time, ensures uptime, and improves production efficiency.

[0036] Furthermore, by sealing the printing cavity 100, when the workpiece is unloaded after a round of workpiece manufacturing, the printing cavity 100 will not be in an open state that comes into contact with the air, and the remaining powder in the printing cavity 100 will not fall or slip, thus avoiding the waste of powder.

[0037] Furthermore, such as Figure 1As shown, an inflatable sealing ring 11 is fitted around the outer periphery of the sealing cover plate 1, and both the outer periphery of the sealing cover plate 1 and the sidewall of the connecting opening can abut against the inflatable sealing ring 11. It can be understood that by setting the inflatable sealing ring 11, the effectiveness of the sealing cover plate 1 in sealing the printing cavity 100 is improved, thus enhancing the sealing effect of the printing cavity 100. The inflatable sealing ring 11 is existing technology and is a hollow flexible sealing element made of materials such as silicone rubber and EPDM rubber; its specific structure will not be described in detail in this embodiment. Of course, in other embodiments, other types of sealing rings can also be fitted around the outer periphery of the sealing cover plate 1 to ensure a good sealing effect.

[0038] In this embodiment, a groove is provided on the outer periphery of the sealing cover plate 1, and the inflatable sealing ring 11 is partially located in the groove to improve the stability of the inflatable sealing ring 11.

[0039] Furthermore, it can be conceived that when using the inflatable sealing ring 11, the area at the connection between the upper and lower cavities, i.e. the connecting port, can be completely sealed. Under the condition that the motion accuracy of the drive mechanism 2 is constant, the gap in this area can be adaptively sealed, so that the overall airtightness of the printing cavity 100 reaches a high level.

[0040] In this embodiment, when the sealing cover 1 is in the initial state, the sealing cover 1 and the sealing plate of the printing cavity 100 form an integral whole, that is, it is located in the space formed by the sealing plate of the printing cavity 100.

[0041] Furthermore, the side of the sealing cover 1 away from the drive mechanism 2 is planar. It is understood that the planar shape of the side of the sealing cover 1 away from the drive mechanism 2, which faces the inside of the printing cavity 100, will not affect the powder spreading and internal airflow during printing. That is, it will not affect the operation of other structures or components during equipment use, nor will it affect the operation of the metal powder additive manufacturing equipment.

[0042] For example, such as Figures 1-2As shown, the drive mechanism 2 includes a mounting plate 21, a lifting assembly 22, and a rotating assembly 23. The mounting plate 21 is fixed to the inner wall of the printing cavity 100. The lifting assembly 22 is mounted on the mounting plate 21 and can move relative to the mounting plate 21. The rotating assembly 23 is connected to the lifting assembly 22, and the lifting assembly 22 can drive the rotating assembly 23 to move. The output end of the rotating assembly 23 is connected to the sealing cover plate 1. It can be understood that by setting the lifting assembly 22 and the rotating assembly 23, when the sealing cover plate 1 needs to move from the initial state to the sealed state, the lifting assembly 22 can drive the rotating assembly 23 to move. The output end of the rotating assembly 23 is connected to the sealing cover plate 1, which can further adjust the position of the sealing cover plate 1, so that the sealing cover plate 1 moves accurately to the communication port to seal the printing cavity 100. Specifically, the lifting assembly 22 can drive the rotating assembly 23 to move along the length direction of the lifting assembly 22, and the rotating assembly 23 can drive the sealing cover plate 1 to rotate.

[0043] Furthermore, the lifting assembly 22 includes a drive member 221 and a slide 222. The drive member 221 is mounted on the mounting plate 21, and its drive end is connected to the slide 222. The rotating assembly 23 is mounted on the slide 222, and the drive member 221 can drive the slide 222 to move. It is understood that the drive member 221 and the slide 222 cooperate, eliminating the need to directly mount the rotating assembly 23 to the drive end of the drive member 221, thus improving installation convenience. Furthermore, mounting holes and other structures can be provided on the slide 222 to stably mount the rotating assembly 23, improving its stability. In this embodiment, the drive end of the drive member 221 can reciprocate along the length of the drive member 221, and the drive member 221 can be a cylinder.

[0044] Furthermore, the rotating assembly 23 includes a first rotating member 231, a first connecting rod 232, a second rotating member 233, a second connecting rod 234, and a third rotating member 235. The first rotating member 231 is mounted on the slide table 222. One end of the first connecting rod 232 is connected to the first rotating member 231. The second rotating member 233 is mounted on the other end of the first connecting rod 232. One end of the second connecting rod 234 is connected to the second rotating member 233. The third rotating member 235 is mounted on the other end of the second connecting rod 234. The sealing cover plate 1 is connected to the third rotating member 235. It can be understood that by setting the first rotating member 231, the first connecting rod 232, the second rotating member 233, the second connecting rod 234, and the third rotating member 235 in coordination, the angle of the sealing cover plate 1 can be adjusted multiple times. In conjunction with the lifting assembly 22, the position of the sealing cover plate 1 can be precisely controlled.

[0045] In this embodiment, the first rotating member 231, the second rotating member 233, and the third rotating member 235 can all rotate along their own axes. The axis of the first rotating member 231 is parallel to the axis of the second rotating member 233 and the axis of the third rotating member 235, and is perpendicular to the length direction of the driving member 221. This further improves the accuracy of the position adjustment of the sealing cover plate 1, thereby improving the sealing effect of the sealing cover plate 1 on the printing cavity 100.

[0046] Furthermore, multiple mounting holes are provided at both ends of the first connecting rod 232 and both ends of the second connecting rod 234, and a receiving hole is provided at the other end of the first connecting rod 232, which facilitates transmission connection with the first rotating member 231, the second rotating member 233 and the third rotating member 235.

[0047] Specifically, one end of the first connecting rod 232 is connected to the first rotating member 231 through multiple mounting holes and multiple fasteners. The other end of the first connecting rod 232 is connected to the second rotating member 233 through multiple mounting holes and multiple fasteners. The second rotating member 233 partially passes through a receiving hole and is drively connected to one end of the second connecting rod 234. The third rotating member 235 is mounted on multiple mounting holes at the other end of the second connecting rod 234 using multiple fasteners. The first rotating member 231, the second rotating member 233, and the third rotating member 235 can all be integrated motor modules, which greatly simplifies the system design and mechanical layout, and features high integration and space saving. It replaces the conventional transmission method of a reducer combined with a servo motor, effectively reducing the overall structural size and weight of the rotating assembly 23 in this embodiment. In this embodiment, the first rotating member 231 can be mounted on the slide table 222 by fasteners, which can be bolts.

[0048] In this embodiment, the dimension of one end of the first connecting rod 232 is smaller than the dimension of the other end of the first connecting rod 232. It is understood that one end of the first connecting rod 232 is connected to the first rotating member 231, which is mounted on the slide table 222. The smaller dimension of one end of the first connecting rod 232 facilitates the rotation of the first connecting rod 232 by the first rotating member 231, reducing the probability of interference between the first connecting rod 232 and the slide table 222, and ensuring stable operation of the first connecting rod 232. Furthermore, the larger dimension of the other end of the first connecting rod 232 allows for the simultaneous opening of multiple mounting holes and receiving holes, facilitating the installation of the second rotating member 233.

[0049] Furthermore, a connector 236 is provided between the third rotating member 235 and the sealing cover plate 1. The connector 236 is used to connect the third rotating member 235 and the sealing cover plate 1. It can be understood that by providing the connector 236, it is convenient to connect the third rotating member 235 and the sealing cover plate 1. In this embodiment, the connector 236 is L-shaped, with its bottom connected to the sealing cover plate 1 and its side connected to the third rotating member 235.

[0050] In this embodiment, two rotating components 23 are provided, and the driving component 221 is located between the two first rotating components 231. It can be understood that by providing two rotating components 23, the stability of the connection between the rotating components 23 and the sealing cover plate 1 is improved, and the driving component 221 is located between the two first rotating components 231, that is, the two rotating components 23 are spaced apart and simultaneously connected to the sealing cover plate 1, which improves the stability when adjusting the angle of the sealing cover plate 1.

[0051] For example, the drive mechanism 2 further includes a guide rail 24 and a guide plate 25. The guide plate 25 is connected to the mounting plate 21, and the guide rail 24 is mounted on the guide plate 25. A guide groove (not shown in the figure) is provided on the side of the slide table 222 opposite to the lifting assembly 22. The guide groove is slidably engaged with the guide rail 24. It can be understood that by setting the guide rail 24 and the guide plate 25, the guide plate 25 is used to mount the guide rail 24, which improves the stability of the guide rail 24. The guide groove is slidably engaged with the guide rail 24, which can guide the movement of the slide table 222 and improve the stability of the slide table 222 during movement.

[0052] Furthermore, the slide table 222 has multiple guide grooves on the side opposite to the lifting assembly 22, and the guide plate 25 is equipped with multiple guide rails 24, with each guide groove corresponding to one of the multiple guide rails 24. It can be understood that by setting multiple sets of corresponding guide grooves and guide rails 24, the stability of the slide table 222 during movement can be further improved. In this embodiment, two guide grooves and two guide rails 24 are provided.

[0053] This embodiment also provides a metal powder additive manufacturing apparatus, including a printing cavity 100 and a forming cavity 200. The metal powder additive manufacturing apparatus also includes a sealing structure for the above-mentioned cavity, and the sealing structure is located inside the printing cavity 100. During workpiece manufacturing, the sealing cover 1 is in its initial state, located away from the connection port. At this time, the printing cavity 100 and the forming cavity 200 are in communication. After the workpiece is manufactured, it is removed from the printing cavity 100. At this time, the sealing cover 1 can switch from its initial state to a sealed state, and the printing cavity 100 is sealed, ensuring that the oxygen content in the printing cavity 100 remains at its original low oxygen content state. When printing restarts, the reassembled forming cavity 200 connects with the printing cavity 100. At this time, the sealing cover 1 switches from its sealed state to its initial state, and the forming cavity 200 and the printing cavity 100 are in communication, restoring a complete and sealed cavity. The oxygen content in the cavity only increases slightly, allowing printing to begin directly or after a brief deoxygenation process. This reduces the time required for inerting and purging, reduces the amount of inert gas needed, avoids wasting time, ensures the uptime of the metal powder additive manufacturing equipment, and improves production efficiency.

[0054] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A sealing structure of a cavity, the cavity comprising a printing cavity (100) and a forming cavity (200) having a communication port between the printing cavity (100) and the forming cavity (200), the sealing structure being installed in the printing cavity (100), characterized in that, The sealing structure comprises: a sealing cover plate (1) movably arranged in the printing cavity (100), the sealing cover plate (1) having an initial state and a sealing state, when the sealing cover plate (1) is in the initial state, the sealing cover plate (1) is located away from the communication port, and the printing cavity (100) and the forming cavity (200) are in communication, when the sealing cover plate (1) is in the sealing state, the sealing cover plate (1) blocks the communication port to seal the printing cavity (100); a driving mechanism (2) installed in the printing cavity (100), the driving mechanism (2) being capable of driving the sealing cover plate (1) to switch between the initial state and the sealing state.

2. The sealed structure of a cavity according to claim 1, wherein, The outer periphery of the sealing cover plate (1) is sleeved with an inflatable sealing ring (11), and the outer periphery of the sealing cover plate (1) and the side wall of the communication port can abut against the inflatable sealing ring (11).

3. The sealed structure of a cavity according to claim 1, wherein, The driving mechanism (2) comprises a mounting plate (21), a lifting assembly (22) and a rotating assembly (23), the mounting plate (21) is fixed to the inner wall of the printing cavity (100), the lifting assembly (22) is installed on the mounting plate (21) and can move with the mounting plate (21), the rotating assembly (23) is in transmission connection with the lifting assembly (22), the lifting assembly (22) can drive the rotating assembly (23) to move, and the output end of the rotating assembly (23) is connected with the sealing cover plate (1).

4. The sealed structure of a cavity according to claim 3, wherein, The lifting assembly (22) comprises a driving member (221) and a sliding table (222), the driving member (221) is installed on the mounting plate (21), the driving end of the driving member (221) is connected with the sliding table (222), and the rotating assembly (23) is installed on the sliding table (222), so that the driving member (221) can drive the sliding table (222) to move.

5. The sealed structure of a cavity according to claim 4, wherein, The rotating assembly (23) comprises a first rotating member (231), a first connecting rod (232), a second rotating member (233), a second connecting rod (234) and a third rotating member (235), the first rotating member (231) is installed on the sliding table (222), one end of the first connecting rod (232) is connected with the first rotating member (231), the second rotating member (233) is installed on the other end of the first connecting rod (232), one end of the second connecting rod (234) is connected with the second rotating member (233), the third rotating member (235) is installed on the other end of the second connecting rod (234), and the sealing cover plate (1) is connected with the third rotating member (235).

6. The sealed structure of a cavity according to claim 4, wherein, The driving mechanism (2) further comprises a guide rail (24) and a guide plate (25), the guide plate (25) is connected with the mounting plate (21), the guide rail (24) is installed on the guide plate (25), one side of the sliding table (222) away from the lifting assembly (22) is provided with a guide groove, and the guide groove is in sliding fit with the guide rail (24).

7. The sealed structure of a cavity according to claim 6, wherein A plurality of guide grooves are formed on the side of the sliding table (222) away from the lifting assembly (22), and the guide plate (25) is provided with a plurality of guide rails (24), and the plurality of guide grooves and the plurality of guide rails (24) are one-to-one corresponding.

8. The sealed structure of a cavity according to claim 5, wherein, The rotating assembly (23) is provided with two, and the driving member (221) is located between the two first rotating members (231).

9. The sealed structure of a cavity according to any one of claims 1 to 8, wherein The side of the sealing cover plate (1) away from the driving mechanism (2) is planar.

10. A metal powder additive manufacturing apparatus comprising a print chamber (100) and a forming chamber (200), characterized in that, The metal powder additive manufacturing equipment further comprises the sealing structure of the cavity according to any one of claims 1-9, and the sealing structure is located in the printing cavity (100).

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