The powder cleaning and ejection system in 3D printing equipment where the formed part remains stationary

Abstract

This utility model discloses a powder cleaning and ejection system for a 3D printing equipment where the formed part remains stationary. The upper end of the forming cylinder can be sealed and connected to the forming port at the lower end of the forming chamber. A piston drive device drives the forming piston in the forming cylinder to move up and down. The forming base plate can be stopped and placed on the forming piston. The upper end of the powder cleaning shell, which is sealed and sleeved on the outside of the forming cylinder, can be sealed and contacted with the lower end face of the forming chamber. The powder cleaning shell is provided with a suction port connected to a vacuum cleaner. The vacuum cleaner can suck away the powder in the powder cleaning shell through the suction port. The powder cleaning shell can be opened so that the translational ejection device can remove the forming base plate and the workpiece on it. The control system controls the piston drive device, the forming cylinder lifting drive device, and the vacuum cleaner to start and stop. This utility model can automatically clean the powder after the workpiece is formed, and the powder cleaning process is safe. After the powder cleaning is completed, the powder cleaning shell opens, and the forming cylinder can easily remove the part without horizontal movement, which is conducive to realizing intelligent and automated production of 3D printing equipment.

Description

Technical Field

[0001] This utility model relates to a 3D printing device, and more particularly to a powder cleaning and ejection system in a 3D printing device where the formed part remains stationary. Background Technology

[0002] Metal 3D printing technology is maturing, and printed parts are becoming increasingly larger and more precise. Large metal parts have reached forming areas of up to 2 meters square, making part removal after forming a difficult task. Each removal requires moving the forming cylinder entirely out of the machine and then pushing the workpiece upwards to expose it for easy retrieval. This is labor-intensive and time-consuming. With the increasing prevalence of metal 3D printing, the demand for automated production is becoming more urgent. Utility Model Content

[0003] To overcome the above deficiencies, this utility model provides a powder cleaning and ejection system for a 3D printing device where the formed part remains stationary. This powder cleaning and ejection system simplifies the forming cylinder movement system of the 3D printing device, enables rapid part removal, and facilitates automated production in 3D printing.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a powder cleaning and part ejection system for a stationary formed part in a 3D printing equipment, including a forming cylinder, a forming piston, a piston driving device, and a control system. The upper end of the forming cylinder can be sealed and connected to the forming port at the lower end of the forming chamber of the 3D printing equipment. The forming piston is installed inside the forming cylinder, which is circumferentially stopped and can move vertically and vertically in an axial direction. The piston driving device drives the forming piston to intermittently descend or ascend. The system is characterized by further including a forming cylinder lifting driving device, a powder cleaning shell, a vacuum cleaner, and a forming base plate, wherein the forming base plate can be placed on the forming piston. On the upper surface, the forming base plate can be circumferentially stopped and accommodated in the forming cylinder. The 3D printing equipment can perform 3D scanning and printing of workpieces on the forming base plate. The powder cleaning shell is sealed on the outside of the forming cylinder. The upper end of the powder cleaning shell can be in sealed contact with the lower end face of the forming chamber. The powder cleaning shell is provided with a dust suction port, which is connected to a vacuum cleaner. The vacuum cleaner can suck away all the powder in the powder cleaning shell through the dust suction port. The powder cleaning shell can be opened so that the translation and picking device can pick up the forming base plate and the workpiece on it. The control system controls the piston drive device, the forming cylinder lifting drive device and the vacuum cleaner to start and stop.

[0005] As a further improvement of the utility model, the forming cylinder lifting drive device includes a forming cylinder bottom support plate, a forming cylinder lifting guide rail, a forming cylinder drive motor, and a forming cylinder drive screw. The forming cylinder lifting guide rail is fixedly installed on the frame of the 3D printing equipment. The forming cylinder bottom support plate is slidably installed on the forming cylinder lifting guide rail and supports the lower end face of the forming cylinder. The forming cylinder drive screw is axially stopped and circumferentially rotatable and is installed on the frame of the 3D printing equipment. The forming cylinder drive screw extends vertically and is movably screwed to the forming cylinder bottom support plate. The forming cylinder drive motor drives the forming cylinder drive screw to rotate through a reducer.

[0006] As a further improvement of the utility model, the forming cylinder bottom support plate is an L-shaped slider or a cylindrical structure with an upper inner diameter larger than the lower inner diameter, and the forming cylinder bottom support plate covers the cylinder bottom side and the lower end edge of the forming cylinder.

[0007] As a further improvement of the utility model, a forming cylinder drive column is also fixedly installed inside the frame of the 3D printing equipment. The bottom of the forming cylinder is provided with a clearance hole. The forming cylinder drive column is a hollow cylindrical structure. A piston drive column is fixedly installed at the lower end of the forming piston. The piston drive column is able to move up and down and passes through the clearance hole and the inner hole of the forming cylinder drive column. The piston drive device includes a piston drive motor, a piston drive reducer and a piston drive screw. The piston drive motor and the piston drive reducer are both fixedly installed on the forming cylinder drive column. The piston drive screw is movably screwed to the piston drive column. The piston drive screw is axially stopped and circumferentially rotatable and is installed inside the forming cylinder drive column. The piston drive motor drives the piston drive screw to rotate intermittently through the piston drive reducer.

[0008] As a further improvement of the utility model, at least one sealing ring is provided on the outer circumference of the upper end of the forming cylinder, and the outer circumference of the forming cylinder is in dynamic sealing contact with the inner wall of the powder cleaning shell through the sealing ring.

[0009] As a further improvement of the utility model, the side wall of the powder cleaning shell is provided with several rows of dust suction holes evenly spaced from top to bottom, and the dust suction holes are connected to the air intake of the vacuum cleaner.

[0010] As a further improvement of the utility model, a row of air supply holes is provided on the side wall of the powder cleaning shell, and the air supply holes on the powder cleaning shell are located above the dust suction hole, and the air supply holes are connected to the exhaust port of the vacuum cleaner.

[0011] As a further improvement of the utility model, the powder cleaning shell is installed in the 3D printing equipment with a lifting and lowering motion. The powder cleaning shell descends to fully expose the forming base plate and the workpiece on it. A powder cleaning shell lifting drive device is also provided, which drives the powder cleaning shell to move up and down to a working position that is in sealed contact with the lower end face of the forming chamber or a part-removal position that is not higher than the upper end face of the forming piston. Alternatively, the powder cleaning shell is fixedly installed in the 3D printing equipment, and the powder cleaning shell is provided with a door that can be opened and closed. The forming base plate and the workpiece on it can be removed by a translational part-removal device through the opened door.

[0012] As a further improvement of the utility model, the cleaning shell is symmetrically provided with two protective doors on the left and right, and is also provided with two protective door opening and closing drive devices. The two protective door opening and closing drive devices can respectively drive the two protective doors to open or close, and each of the two protective doors is provided with at least one sealing strip. When the two protective doors are in the locked state, the sealing strip can keep the two protective doors sealed to the cleaning shell. The control system controls the opening and closing of the two protective door opening and closing drive devices.

[0013] As a further improvement of the utility model, the left and right protective doors are respectively hinged to the outer walls of the left and right sides of the powder cleaning shell, or the left and right protective doors are respectively slidably disposed on the outer walls of the left and right sides of the powder cleaning shell, and the opening and closing drive devices of the left and right protective doors are respectively a motor or a cylinder.

[0014] As a further improvement of the utility model, the powder cleaning shell is also provided with a part-removal sensing device. The part-removal sensing device can sense the translational part-removal device that enters the 3D printing equipment to remove the part. The part-removal sensing device communicates with the control system of the 3D printing equipment to transmit its sensing signal.

[0015] The beneficial technical effects of this utility model are as follows: This utility model eliminates the horizontal movement function system of the forming cylinder, simplifies the transmission chain of the forming cylinder, and is more conducive to ensuring the centering accuracy of the forming cylinder. By setting a powder cleaning shell on the outside of the forming cylinder, after the workpiece is formed, the forming cylinder falls to the upper opening and is flush with the upper plane of the forming piston, exposing the workpiece and the residual powder around it. The residual powder is sucked away by the suction port of a powerful industrial vacuum cleaner connected to the powder cleaning shell, achieving the purpose of automatic powder cleaning. Moreover, the powder cleaning shell can maintain a sealed connection with the outer wall of the forming cylinder and the lower end face of the forming chamber during the powder cleaning process, ensuring the airtightness of the powder cleaning shell and preventing oxygen from entering the powder cleaning shell and causing an explosion. After the powder cleaning is completed, the powder cleaning shell is opened, and the forming cylinder does not need to move horizontally. The translation and picking device can easily remove the workpiece together with the forming base plate. At the same time, a new forming base plate can be replaced to prepare for the next 3D printing. The picking is convenient and quick, which is conducive to realizing intelligent and automated production of 3D printing equipment, saving labor, reducing the cost of 3D printing equipment, and improving overall production efficiency. Attached Figure Description

[0016] Figure 1 A schematic diagram illustrating the part-removal principle of existing small-scale 3D printing equipment;

[0017] Figure 2 A schematic diagram illustrating the part-removal principle of existing large or super-large 3D printing equipment;

[0018] Figure 3 This is a schematic diagram of the first part-removal principle of the 3D printing equipment of this utility model;

[0019] Figure 4 This is a schematic diagram of the second part-removal principle of the 3D printing equipment of this utility model;

[0020] Figure 5 This is a three-dimensional structural diagram of the present invention. Detailed Implementation

[0021] Example: A powder cleaning and ejection system for a stationary formed part in a 3D printing device includes a forming cylinder 1, a forming piston 2, a piston drive device, and a control system. The upper end of the forming cylinder 1 is sealed and connected to the forming port at the lower end of the forming chamber 3 of the 3D printing device. The forming piston 2 is circumferentially stopped and axially movable in a dynamic seal within the forming cylinder 1. The piston drive device drives the forming piston 2 to intermittently descend or ascend. The system also includes a forming cylinder 1 lifting drive device, a powder cleaning shell 4, a vacuum cleaner 5, and a forming base plate 6. The forming base plate 6 can be placed on the upper surface of the forming piston 2, and the forming base plate 6 can be circularly... The circumferentially stopped assembly is housed within the forming cylinder 1. The 3D printing equipment can perform 3D scanning and printing of workpieces on the forming base plate 6. The powder cleaning shell 4 is sealed and fitted onto the outside of the forming cylinder 1. The upper end of the powder cleaning shell 4 can be in sealed contact with the lower end face of the forming chamber 3. The powder cleaning shell 4 is provided with a dust suction port, which is connected to a vacuum cleaner 5. The vacuum cleaner 5 can suck away all the powder inside the powder cleaning shell 4 through the dust suction port. The powder cleaning shell 4 can be opened so that the translational part removal device 7 can remove the forming base plate 6 and the workpiece on it. The control system controls the piston drive device, the forming cylinder lifting drive device, and the vacuum cleaner to start and stop.

[0022] When the 3D printing equipment performs laser printing, the upper ends of the forming cylinder 1 and the powder cleaning shell 4 are sealed to the lower bottom surface of the forming chamber 3, and the lower end of the powder cleaning shell 4 is sealed to the outer wall of the forming cylinder 1. After the workpiece is formed, the forming cylinder 1 falls to the upper opening, which is flush with the upper plane of the forming piston 2. The powder cleaning shell 4 remains stationary, exposing the workpiece and the surrounding residual powder. The residual powder is sucked away by the powerful industrial vacuum cleaner 5 connected to the powder cleaning shell 4. The complete workpiece is then exposed. At this time, the powder cleaning shell 4 is opened, and the workpiece, along with the forming base plate 6 below it, is removed by the translation and removal device 7. At the same time, a new forming base plate 6 is placed on the forming piston 2. The powder cleaning shell 4, forming cylinder 1, and forming piston 2 are then reset for the next 3D printing. This mechanism enables rapid powder cleaning and removal of the 3D printing equipment, greatly improving the efficiency of powder cleaning and removal, and avoiding manual operation. During the powder cleaning and removal process, the forming cylinder 1 does not need to move horizontally to the outside of the 3D printing equipment; the forming cylinder 1 only needs to retain its vertical movement function. The transmission chain of forming cylinder 1 is simplified, which is more conducive to ensuring the centering accuracy of forming cylinder 1.

[0023] The forming cylinder 1 lifting drive device includes a forming cylinder bottom 12 support plate 8, a forming cylinder lifting guide rail 9, a forming cylinder drive motor 10, and a forming cylinder drive screw 11. The forming cylinder lifting guide rail 9 is fixedly installed on the frame 17 of the 3D printing equipment. The forming cylinder bottom 12 support plate 8 is slidably installed on the forming cylinder lifting guide rail 9 and supports the lower end face of the cylinder bottom 12 of the forming cylinder 1. The forming cylinder drive screw 11 is axially stopped and circumferentially rotatable and is installed on the frame 17 of the 3D printing equipment. The forming cylinder drive screw 11 extends vertically and is movably screwed to the forming cylinder bottom 12 support plate 8. The forming cylinder drive motor 10 drives the forming cylinder drive screw 11 to rotate through a reducer. The forming cylinder drive motor 10 can raise or lower the forming cylinder 1 by rotating in both directions. When rising, the forming cylinder 1 is supported by the forming cylinder bottom 12 support plate 8. When lowering, the forming cylinder 1 is lowered by reducing the supporting force of the forming cylinder bottom 12 support plate 8 using the mass of the forming cylinder 1 itself. This structure can effectively reduce energy input and save energy.

[0024] The forming cylinder bottom 12 support plate 8 is an L-shaped slider or a cylindrical structure with an upper inner diameter larger than the lower inner diameter. The forming cylinder bottom 12 support plate 8 covers the side surface and lower edge of the forming cylinder 1 bottom 12. This structure limits the bottom and side surfaces of the forming cylinder 1 bottom 12, which helps to ensure the accuracy of the lifting and lowering movement of the forming cylinder 1.

[0025] The frame 17 of the 3D printing equipment is also fixedly provided with a forming cylinder drive column 13. The bottom 12 of the forming cylinder 1 is provided with a clearance hole 14. The forming cylinder drive column 13 is a hollow cylindrical structure. The lower end of the forming piston 2 is fixedly provided with a piston drive column 15. The piston drive column 15 is able to move up and down and passes through the clearance hole 14 and the inner hole of the forming cylinder drive column 13. The piston drive device includes a piston drive motor 18, a piston drive reducer and a piston drive screw. The piston drive motor 18 and the piston drive reducer are both fixedly installed on the forming cylinder drive column 13. The piston drive screw is movably screwed to the piston drive column 15. The piston drive screw is axially stopped and circumferentially rotatable and is installed in the forming cylinder drive column 13. The piston drive motor 18 drives the piston drive screw to rotate intermittently through the piston drive reducer. The forming cylinder drive column 13 is used to install the piston drive motor 18, piston drive reducer and piston drive screw for driving the forming piston 2 to move up and down, so as to hide the piston drive device inside the forming cylinder 1 and save space. At the same time, the upper end of the forming cylinder drive column 13 can also be used to limit the descent distance of the forming cylinder 1 to prevent the forming cylinder 1 from falling too far and separating from the powder cleaning shell 4.

[0026] At least one sealing ring 16 is provided on the outer circumference of the upper end of the forming cylinder 1, and the outer circumference of the forming cylinder 1 is in dynamic sealing contact with the inner wall of the powder cleaning shell 4 through the sealing ring 16.

[0027] The side wall of the powder cleaning shell 4 is evenly spaced with several rows of suction holes from top to bottom, and these suction holes are connected to the air intake of the vacuum cleaner 5. These suction holes, connected to the air intake of the vacuum cleaner 5, are used to remove residual powder that has not been sintered after printing, and are also reliably grounded to eliminate static electricity generated by powder friction during the suction process. The multiple rows of suction holes at different heights on the powder cleaning shell 4 can, on the one hand, address the different heights of the upper opening of the forming cylinder 1, ensuring complete removal of residual powder; on the other hand, multiple suction ports can simultaneously suction, achieving high-speed removal of residual powder from inside the powder cleaning shell 4. In the design, 24 suction ports connected to the industrial vacuum cleaner 5 can be designed at the front and rear of the powder cleaning shell 4 to achieve efficient dust removal.

[0028] The side wall of the powder cleaning shell 4 is also provided with a row of air supply holes, and the air supply holes on the powder cleaning shell 4 are located above the dust suction holes. The air supply holes are connected to the exhaust port of the vacuum cleaner 5. A row of air supply holes is set above the arrayed dust suction holes and connected to the exhaust port of the vacuum cleaner 5 to send the filtered protective gas back to the powder cleaning space. This also ensures that no oxygen enters (mixes in) during the powder suction process to prevent explosion. Control valves that can close or open can also be provided in the dust suction holes and air supply holes of the powder cleaning shell 4. The control system controls the opening and closing of the control valves. During powder cleaning, the control valves are opened to clean the powder. After the powder cleaning is completed, the control valves are closed to ensure that the inside of the powder cleaning shell 4 is in a sealed state.

[0029] The powder cleaning shell 4 is installed in the 3D printing equipment with the ability to move up and down. When the powder cleaning shell 4 descends, the forming base plate 6 and the workpiece on it are fully exposed. A powder cleaning shell lifting drive device is also provided, which drives the powder cleaning shell 4 to move up and down so that it reaches the working position that is in sealed contact with the lower end face of the forming chamber 3 or the part removal position that is not higher than the upper end face of the forming piston 2. Alternatively, the powder cleaning shell 4 is fixedly installed in the 3D printing equipment. The powder cleaning shell 4 is provided with a protective door 19 that can be opened and closed. The forming base plate 6 and the workpiece on it can be removed by the translational part removal device 7 through the opened protective door 19. After the workpiece is formed, the powder cleaning shell 4 can be opened by sliding it downwards, or the powder cleaning shell 4 can remain stationary while the protective door 19 on it is opened to expose the workpiece. In addition, the powder cleaning shell can also be opened in other ways, such as when the powder cleaning shell is a two-part spliced ​​structure, which can be opened by sliding the two parts horizontally relative to each other, or when the powder cleaning shell is two parts spliced ​​together by hinges, which can also be opened by rotating relative to each other around the joint axis. Any way of opening the powder cleaning shell that a person skilled in the art can conceive of based on the technical solution of this application is within the protection scope of this application.

[0030] The cleaning shell 4 is symmetrically equipped with two protective doors 19 on the left and right sides, and also equipped with two protective door opening and closing drive devices. These devices can respectively drive the left and right protective doors to open or close. Each of the left and right protective doors 19 has at least one sealing strip, which maintains a sealed connection between the left and right protective doors 19 and the cleaning shell 4 when the doors are locked. The control system controls the start and stop of the left and right protective door opening and closing drive devices. By providing two openable and closable protective doors 19 on the cleaning shell 4, after cleaning, the parts can be removed from one side of the protective door and replaced with a new forming base plate from the other side. After removing the parts and replacing the forming base plate, the open left and right protective doors 19 are closed.

[0031] The two protective doors 19 are hinged to the outer wall of the cleaning shell 4, or slidably mounted on the outer wall of the cleaning shell 4. The driving devices for opening and closing the two protective doors are motors or cylinders. The two protective doors 19 can also be mounted on the cleaning shell 4 by a combination of sliding and rotating mechanisms, which facilitates full opening for parts removal and ensures that the interior of the cleaning shell 4 is sealed after closing. Ideally, a locking mechanism is provided on the cleaning shell 4, which can move to lock or unlock the protective door and the cleaning shell 4. When locked, the protective door 19 cannot move in the opening direction. The control system controls the locking mechanism to operate. By setting a locking mechanism, such as a sliding pin inserted into a slot on the left protective door 19 and the cleaning shell 4, a stable sealed connection between the protective door 19 and the cleaning shell 4 is achieved, preventing air leakage when subjected to air pressure.

[0032] The powder-cleaning shell 4 is also equipped with a part-retrieving sensor. This sensor can detect the translational part-retrieving device 7 that enters the 3D printing equipment to retrieve parts. The sensor communicates with the control system of the 3D printing equipment to transmit its sensing signals. By sensing the translational part-retrieving device 7, erroneous operations are avoided, the safety of part retrieval and processing is improved, and intelligent 3D printing processing is more easily achieved.

Claims

1. A powder cleaning and ejection system for a stationary formed part in a 3D printing equipment, comprising a forming cylinder (1), a forming piston (2), a piston driving device, and a control system, wherein the upper end of the forming cylinder is in sealed communication with the forming port at the lower end of the forming chamber (3) of the 3D printing equipment, the forming piston is circumferentially stopped and axially movable in a dynamic sealing manner and is installed inside the forming cylinder, and the piston driving device drives the forming piston to intermittently descend or ascend, characterized in that: It is also equipped with a forming cylinder lifting drive device, a powder cleaning shell (4), a vacuum cleaner (5), and a forming base plate (6). The forming base plate can be placed on the upper end face of the forming piston, and the forming base plate can be circumferentially stopped and accommodated in the forming cylinder. The 3D printing equipment can perform 3D scanning and printing of workpieces on the forming base plate. The powder cleaning shell is sealed on the outside of the forming cylinder. The upper end of the powder cleaning shell can be sealed and contacted with the lower end face of the forming chamber. The powder cleaning shell is provided with a dust suction port, which is connected to the vacuum cleaner. The vacuum cleaner can suck away all the powder in the powder cleaning shell through the dust suction port. The powder cleaning shell can be opened so that the translation and picking device (7) can pick up the forming base plate and the workpiece on it. The control system controls the piston drive device, the forming cylinder lifting drive device, and the vacuum cleaner to start and stop.

2. The powder cleaning and part removal system of claim 1, wherein: The forming cylinder lifting drive device includes a forming cylinder bottom support plate (8), a forming cylinder lifting guide rail (9), a forming cylinder drive motor (10), and a forming cylinder drive screw (11). The forming cylinder lifting guide rail is fixedly installed on the frame of the 3D printing equipment. The forming cylinder bottom support plate is slidably installed on the forming cylinder lifting guide rail and supports the bottom (12) of the forming cylinder. The forming cylinder drive screw is axially stopped and circumferentially rotatable and is installed on the frame (17) of the 3D printing equipment. The forming cylinder drive screw extends vertically and is movably screwed to the forming cylinder bottom support plate. The forming cylinder drive motor drives the forming cylinder drive screw to rotate through a reducer.

3. The powder cleaning and part removal system of claim 2, wherein: the first and second powder cleaning devices are configured to move in a direction parallel to the first and second powder cleaning devices; and the first and second powder cleaning devices are configured to move in a direction perpendicular to the first and second powder cleaning devices. The forming cylinder bottom support plate is an L-shaped slider or a cylindrical structure with an upper inner diameter larger than the lower inner diameter. The forming cylinder bottom support plate covers the bottom side and lower end edge of the forming cylinder.

4. The powder cleaning and part removal system of claim 2, wherein: The frame of the 3D printing equipment is also fixedly provided with a forming cylinder drive column (13). The bottom of the forming cylinder is provided with a clearance hole (14). The forming cylinder drive column is a hollow cylindrical structure. The lower end of the forming piston is fixedly provided with a piston drive column (15). The piston drive column can move up and down and passes through the clearance hole and the inner hole of the forming cylinder drive column. The piston drive device includes a piston drive motor (18), a piston drive reducer and a piston drive screw. The piston drive motor and the piston drive reducer are both fixedly installed on the forming cylinder drive column. The piston drive screw is movably screwed to the piston drive column. The piston drive screw is axially stopped and circumferentially rotatable and is installed in the forming cylinder drive column. The piston drive motor drives the piston drive screw to rotate intermittently through the piston drive reducer. ​ 5. The powder cleaning and part removal system of claim 1, wherein: At least one sealing ring (16) is provided on the outer circumference of the upper end of the forming cylinder, and the outer circumference of the forming cylinder is in dynamic sealing contact with the inner wall of the powder cleaning shell through the sealing ring. ​ 6. The powder cleaning and part removal system of claim 1, wherein: The side wall of the cleaning powder casing is provided with several rows of dust suction holes evenly spaced from top to bottom. The dust suction holes are connected to the air intake of the vacuum cleaner. The side wall of the cleaning powder casing is also provided with a row of air supply holes, and the air supply holes on the cleaning powder casing are located above the dust suction holes. The air supply holes are connected to the air exhaust of the vacuum cleaner. ​ 7. The powder cleaning and part removal system of claim 1, wherein: The powder cleaning shell is installed in the 3D printing equipment with the ability to move up and down. The powder cleaning shell can be lowered to fully expose the forming base plate and the workpiece on it. A powder cleaning shell lifting drive device is also provided. The powder cleaning shell lifting drive device drives the powder cleaning shell to move up and down to the working position that is in sealed contact with the lower end face of the forming chamber or the part taking position that is not higher than the upper end face of the forming piston; or, the powder cleaning shell is fixedly installed in the 3D printing equipment. The powder cleaning shell is provided with a protective door (19) that can be opened and closed. The forming base plate and the workpiece on it can be taken away by the translational part taking device through the opened protective door.

8. The powder cleaning and ejection system in the 3D printing equipment as described in claim 7, wherein the formed part remains stationary, is characterized in that: The cleaning powder casing is symmetrically provided with two protective doors on the left and right, and is also provided with two protective door opening and closing drive devices. The two protective door opening and closing drive devices can respectively drive the two protective doors to open or close. Each of the two protective doors is provided with at least one sealing strip. The sealing strip can keep the two protective doors sealed to the cleaning powder casing when the two protective doors are in the locked state. The control system controls the opening and closing of the two protective door opening and closing drive devices.

9. The powder cleaning and part removal system of claim 8, wherein: the powder cleaning and part removal system is a 3D printing device. The left and right protective doors are respectively hinged to the outer walls of the left and right sides of the cleaning shell, or the left and right protective doors are respectively slidably located on the outer walls of the left and right sides of the cleaning shell. The opening and closing drive devices for the left and right protective doors are respectively a motor or a cylinder.

10. The powder cleaning and part removal system of claim 1, wherein: The powder cleaning shell is also equipped with a part retrieval sensing device, which can sense the translational part retrieval device that enters the 3D printing equipment to retrieve the part. The part retrieval sensing device communicates with the control system of the 3D printing equipment to transmit its sensing signal. ​

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