A printing back-blowing module of an intelligent metal 3D printing device

Abstract

The application relates to a printing back-blowing module of an intelligent metal 3D printing device, and belongs to the field of 3D printing technology. The module comprises a rack, an inert gas tank, a filter barrel, a filter element, a fan and a gas circulation mechanism. The inert gas tank is arranged on the rack, the filter barrel is arranged on the rack, the filter barrel is communicated with the inert gas tank, and the filter element is arranged in the filter barrel. The fan is arranged on the rack, the air inlet of the fan is communicated with the filter barrel, the air outlet of the fan is communicated with the gas circulation mechanism, the gas circulation mechanism is arranged in a working chamber of the 3D printing device, and the gas circulation mechanism is communicated with the filter barrel. In the process of sucking the inert gas into the filter barrel, the filter element is back-blowed, the metal powder adhered to the filter element is blown away from the filter element, the working frequency of cleaning or replacing the filter element is reduced, the 3D printing device can continuously print, and the working efficiency of the metal 3D printing device when printing workpieces is improved.

Description

Technical Field

[0001] This application relates to the field of 3D printing technology, and in particular to a printing backflush module for an intelligent metal 3D printing device. Background Technology

[0002] Metal 3D printing is a technology that constructs objects by printing layer by layer. First, metal powder is spread evenly on the substrate of the forming cylinder by a scraper. Then, according to the design model, the high temperature of the laser beam is used to sinter the metal powder in a specific area to process the current layer. Then, the forming cylinder descends by a layer thickness, and the powder cylinder rises by a certain thickness. The metal powder is then leveled by a scraper and sintered by the laser beam. This process is repeated layer by layer to complete the entire workpiece.

[0003] During the metal 3D printing process, both the process of spreading metal powder with a scraper and the process of sintering metal powder with a laser beam will generate metal powder and fumes. These metal powders and fumes will affect the propagation of the laser beam, thereby affecting the forming quality of the workpiece. Furthermore, metal powders are highly reactive, and excessively concentrated metal powders are extremely prone to fire or dust explosion. Therefore, it is necessary to remove the metal powder and fumes from the chamber and filter the removed metal powder.

[0004] Currently, metal powder is typically filtered using filter cartridges and filter elements. This involves drawing gas containing metal powder and dust from the working chamber into a filter cartridge containing inert gas, where the filter element adsorbs the metal powder. However, this filtration method requires frequent cleaning or replacement of the filter element, and the process of cleaning or replacing the filter element is quite cumbersome, which greatly affects the working efficiency of metal 3D printing equipment when printing workpieces. Summary of the Invention

[0005] In order to improve the working efficiency of metal 3D printing equipment when printing workpieces, this application provides a printing backflush module for intelligent metal 3D printing equipment.

[0006] The printing backflush module of the intelligent metal 3D printing equipment provided in this application adopts the following technical solution:

[0007] A printing backflush module for an intelligent metal 3D printing device includes a frame, an inert gas tank, a filter barrel, a filter element, a fan, and a gas circulation mechanism. The inert gas tank is mounted on the frame, the filter barrel is mounted on the frame and communicates with the inert gas tank, and the filter element is disposed inside the filter barrel. The fan is mounted on the frame, the fan inlet is communicated with the filter barrel, and the fan outlet is communicated with the gas circulation mechanism. The gas circulation mechanism is disposed within the working chamber of the 3D printing device and communicates with the filter barrel.

[0008] By adopting the above technical solution, the gas circulation mechanism is installed in the working chamber of the 3D printing equipment and connected to the filter barrel and the air outlet of the blower. Then, the blower is turned on, and the blower draws the gas in the filter barrel into the working chamber of the 3D printing equipment through the gas circulation mechanism. As the blower draws the gas out of the filter barrel, the pressure inside the filter barrel decreases, and the metal powder and dust in the working chamber are drawn back into the filter barrel through the gas circulation mechanism. The filter element in the filter barrel adsorbs the metal powder. At the same time, the inert gas in the inert gas tank is also drawn into the filter barrel due to the decrease in pressure inside the filter barrel. The inert gas prevents the metal powder in the filter barrel from spontaneously combusting or exploding. At the same time, the inert gas backflushs the filter element during the process of being drawn into the filter barrel, blowing away the metal powder adhering to the filter element, reducing the frequency of cleaning or replacing the filter element, enabling the 3D printing equipment to print continuously and improving the working efficiency of the metal 3D printing equipment when printing workpieces.

[0009] Optionally, the filter canister is equipped with a pulse valve, and the inert gas tank is connected to the pulse valve. The pulse valve is used to drive the gas entering the filter canister to form an airflow pulse.

[0010] By adopting the above technical solution, the inert gas in the inert gas tank first enters the pulse valve, and then enters the filter canister from the pulse valve. The pulse valve causes the inert gas to form an airflow pulse, increasing the pressure of the inert gas entering the filter canister, thereby enhancing the backflushing effect of the inert gas on the filter element and improving the cleaning effect of the inert gas on the filter element.

[0011] Optionally, the filter canister is provided with a venturi tube, which is connected to a pulse valve, and an explosion head is connected to the venturi tube.

[0012] By adopting the above technical solution, the inert gas entering the filter canister from the inert gas tank is pulsed by the pulse valve, and then induced to flow into the explosion head through the venturi tube. The explosion head then diffuses the airflow pulse, increasing the coverage area of ​​the airflow pulse after entering the filter canister, improving the cleaning effect on the filter element, and thus reducing the amount of inert gas used.

[0013] Optionally, the filter canister is equipped with an air filter for diverting the gas inside the filter canister.

[0014] By adopting the above technical solution, when the inert gas in the inert gas tank backflushes the filter element, the air filter is turned on, and part of the gas in the filter canister is filtered by the air filter and discharged into the filter canister, preventing excessive air pressure in the filter canister from causing safety hazards.

[0015] Optionally, the gas circulation mechanism includes a mounting plate, an air inlet pipe, and an air outlet pipe. The mounting plate is detachably installed in the working chamber of the 3D printing equipment. The air inlet pipe is installed on the mounting plate and is connected to the air outlet of the fan. The air outlet pipe is installed on the mounting plate and is connected to the filter barrel. The air outlet pipe is used to guide the gas in the working chamber of the 3D printing equipment into the filter barrel.

[0016] By adopting the above technical solution, the fan draws the gas in the filter canister into the working chamber of the 3D printing equipment, and the filter canister draws the gas containing metal powder from the working chamber of the 3D printing equipment into the filter canister through the air outlet pipe, so that the gas in the filter canister and the gas in the working chamber of the 3D printing equipment are in continuous circulation, which facilitates the continuous discharge of metal powder and dust in the working chamber into the filter canister.

[0017] Optionally, the mounting plate is provided with an air blowing port, which is connected to the air inlet pipe. The air blowing port is used to blow the protective lens on the laser lens away from the laser lens.

[0018] By adopting the above technical solution, when the gas enters the working chamber of the 3D printing equipment through the air inlet pipe, some of the gas in the air inlet pipe is blown out through the air outlet, blowing the protective lens on the laser lens away from the laser lens. This prevents the metal powder content in the working chamber from increasing when the gas cannot be introduced into the working chamber of the 3D printing equipment, while the laser lens continues to work, which could lead to the metal powder burning or exploding. This improves the safety of the 3D printing equipment during printing.

[0019] Optionally, the air inlet duct is equipped with a wind speed sensor for detecting the gas flow rate inside the air inlet duct, and the frame is equipped with a frequency converter, which is electrically connected to the wind speed sensor and the fan.

[0020] By adopting the above technical solution, when the gas flows into the working chamber of the 3D printing equipment through the air inlet pipe, the wind speed sensor detects the gas flow rate in the air inlet pipe. Then, the wind speed sensor transmits the detected wind speed to the frequency converter through an electrical signal. The frequency converter controls the fan to increase or decrease the power according to the set wind speed range, so that the flow rate of the gas flowing into the working chamber of the 3D printing equipment is always kept within the set range.

[0021] Optionally, a spiral dust collector is connected to the filter barrel, and a collection tank is detachably connected to the bottom of the spiral dust collector. The air outlet pipe is connected to the spiral dust collector.

[0022] By adopting the above technical solution, the gas containing metal powder flowing out of the air outlet duct flows into the spiral dust collector. The spiral dust collector drives the gas containing metal powder to rotate at high speed to generate centrifugal force, which separates the metal powder from the gas. The separated metal powder falls into the collection tank for collection, reducing the amount of metal powder entering the filter barrel, thereby reducing the amount of metal powder adhering to the filter element and extending the service life of the filter element. At the same time, it can also reduce the risk of spontaneous combustion caused by static electricity generated by the metal powder rubbing against each other in the filter barrel.

[0023] Optionally, the filter canister includes an outer canister and an inner liner. The outer canister is mounted on a frame, and the inner liner is mounted inside the outer canister, with a channel for gas flow formed between the outer canister and the inner liner. The air outlet pipe is connected to the outer canister, and the filter element is mounted on the inner liner.

[0024] By adopting the above technical solution, the gas containing metal powder entering from the air inlet pipe flows into the channel formed between the outer barrel and the inner liner, and then disperses and flows onto the filter element. The channel formed between the outer barrel and the inner liner disperses the airflow, preventing the gas entering from the air inlet pipe from concentrating and flowing to the same point on the filter element, thus avoiding a reduction in the local filtration effect of the filter element. At the same time, it can also improve the problem of excessive accumulation of metal powder in the filter barrel, which poses a safety hazard.

[0025] Optionally, a recycling tank can be detachably installed at the bottom of the outer tub, and the recycling tank is connected to the channel formed by the outer tub and the inner liner.

[0026] By adopting the above technical solution, the metal powder filtered out by the filter screen and the metal powder blown off the filter screen fall into the recycling tank through the channel between the outer barrel and the inner liner for collection, which improves the convenience for staff to collect the metal powder in the filter barrel.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. During the process of inert gas being drawn into the filter canister, the filter element is back-blown, blowing away the metal dust adhering to the filter element. This eliminates the need to clean or replace the filter element, allowing the 3D printing equipment to print continuously and improving the working efficiency of the metal 3D printing equipment when printing workpieces.

[0029] 2. After the inert gas forms an airflow pulse through the pulse valve, it is then induced to flow into the explosion head through the venturi tube. The explosion head then diffuses the airflow pulse, increasing the coverage area of ​​the airflow pulse after entering the filter canister, improving the cleaning effect on the filter element, and thus reducing the amount of inert gas used.

[0030] 3. The channel formed between the outer barrel and the inner liner disperses the airflow entering the filter barrel, preventing the gas entering from the air inlet pipe from flowing to the same point of the filter element, which would reduce the local filtration effect of the filter element. At the same time, it can also improve the problem of excessive local metal powder accumulation in the filter barrel, which poses a safety hazard. Attached Figure Description

[0031] Figure 1 This is a structural schematic diagram of the rack portion of Embodiment 1 of this application.

[0032] Figure 2 This is a schematic diagram of the gas circulation mechanism of Embodiment 1 of this application.

[0033] Figure 3 This is a cross-sectional schematic diagram of the filter bucket of Embodiment 1 of this application.

[0034] Figure 4 This is a partial structural schematic diagram of Embodiment 1 of this application (part of the rack is hidden in the figure).

[0035] Figure 5 This is a cross-sectional schematic diagram of the filter bucket of Embodiment 2 of this application.

[0036] Reference numerals: 1. Frame; 2. Inert gas tank; 3. Filter barrel; 31. Outer barrel; 32. Inner liner; 4. Filter element; 5. Fan; 6. Gas circulation mechanism; 61. Mounting plate; 62. Inlet duct; 63. Outlet duct; 7. Pulse valve; 8. Venturi tube; 9. Explosion head; 10. Air filter; 11. Air outlet; 12. Wind speed sensor; 13. Frequency converter; 14. Spiral dust collector; 15. Collection tank; 16. Recovery tank; 17. Pressure reducing valve; 18. Inlet duct; 19. Outlet duct; 20. Safety valve; 21. Ventilation valve; 22. Oxygen content sensor. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0038] This application discloses a printing backflush module for an intelligent metal 3D printing device.

[0039] Example 1

[0040] Reference Figure 1 , Figure 2 , combined Figure 3 The printing backflush module of the intelligent metal 3D printing equipment includes a frame 1, an inert gas tank 2, a filter barrel 3, a filter element 4, a fan 5, and a gas circulation mechanism 6.

[0041] Reference Figure 1 , Figure 2The inert gas tank 2 is mounted on the frame 1. In this embodiment, several brake casters are installed at the bottom of the frame 1 to facilitate the movement of the frame 1 by the operator. The inert gas tank 2 is filled with nitrogen gas, and an air compressor for producing nitrogen gas is connected to the outside of the inert gas tank 2. The air compressor produces nitrogen gas and fills the inert gas tank 2. A pressure reducing valve 17 is installed on the inert gas tank 2 to maintain a gas pressure of 0.4 MPa inside the inert gas tank 2 at all times. Figure 3 A filter cartridge 3 is mounted on the frame 1 and is connected to an inert gas tank 2. A filter element 4 is mounted on the inner wall of the filter cartridge 3. In this embodiment, a conduit is connected to the top of the filter cartridge 3 via a quick connector. A butterfly valve is connected to the inert gas tank 2, and the conduit is connected to the butterfly valve via a quick connector. Operators can control the opening and closing of the butterfly valve to control the flow of nitrogen from the inert gas tank 2 into the filter cartridge 3. A blower 5 is mounted on the frame 1. The inlet of the blower 5 is connected to the filter cartridge 3, and the outlet of the blower 5 is connected to a gas circulation mechanism 6. The gas circulation mechanism 6 is installed in the working chamber of the 3D printing equipment, and the gas circulation... The ring mechanism 6 is connected to the filter barrel 3. In this embodiment, a section of corrugated hose is installed on both the air inlet and outlet of the fan 5 through clamps. The corrugated hose is connected to a connecting pipe through a pagoda connector, hose clamp, and clamp. A butterfly valve is on the filter barrel 3. The end of the connecting pipe away from the corrugated hose is also connected to the butterfly valve on the filter barrel 3 through a pagoda connector, hose clamp, and clamp. The butterfly valve allows the operator to easily control the connection between the filter barrel 3 and the air inlet of the fan 5. The corrugated hose can prevent leakage at the pipe connection caused by the mechanical vibration of the fan 5 during operation. Furthermore, the connection method of the pagoda connector, hose clamp, and clamp can improve the tightness of the connection between the pipes.

[0042] Before metal 3D printing, the operator first installs the gas circulation mechanism 6 into the working chamber of the metal 3D printing equipment. Then, the gas circulation mechanism 6 is connected to the air outlet of the fan 5 and the filter canister 3. When metal 3D printing is performed, the fan 5 is turned on. The fan 5 draws the gas in the filter canister 3 into the working chamber of the 3D printing equipment through the gas circulation mechanism 6. After the gas in the filter canister 3 is drawn away by the fan 5, the pressure in the filter canister 3 decreases, so that the gas mixed with metal powder and dust in the working chamber of the 3D printing equipment is drawn into the filter canister 3 through the gas circulation mechanism 6. The filter element 4 adsorbs and filters the metal powder. At the same time, the nitrogen in the inert gas tank 2 is also drawn into the filter canister 3 to prevent the metal powder in the filter canister 3 from spontaneously combusting or exploding. During the process of entering the filter canister 3, the inert gas can also backflush the filter element 4, blowing away the metal powder adhering to the filter element 4, thereby reducing the frequency of cleaning or replacing the filter element 4, allowing the 3D printing equipment to print continuously and improving the working efficiency of the metal 3D printing equipment when printing workpieces.

[0043] Reference Figure 2 , Figure 4 The gas circulation mechanism 6 includes a mounting plate 61, an air inlet pipe 62, and an air outlet pipe 63. The mounting plate 61 is bolted to the working chamber of the 3D printing equipment. In this embodiment, the mounting plate 61 has a pre-drilled hole for the molding cylinder inside the working chamber of the 3D printing equipment to be inserted. The mounting plate 61 is also equipped with an air inlet slot 18 and an air outlet slot 19. The air outlet of the air inlet slot 18 is directly opposite the air inlet of the air outlet slot 19. A filter screen is bolted to the air inlet slot 18 to prevent debris from entering the working chamber. One end of the pipe 62 is connected to the air inlet slot 18, and the other end is connected to the air outlet pipe of the fan 5 by a clamp; one end of the air outlet pipe 63 is connected to the air outlet slot 19, and the other end is connected to the filter barrel 3; and the mounting plate 61 is also equipped with an air blower 11, which is connected to the air inlet pipe 62 and is in the same direction as the air inlet slot 18. The air blower 11 is used to blow the protective lens on the laser lens away from the laser lens. In this embodiment, a filter screen is also installed on the air blower 11 by bolts.

[0044] Gas is drawn into the air inlet pipe 62 by the fan 5, and then blown out through the air inlet 11 and air inlet slot 18. The gas blown out from the air inlet 11 blows the protective lens off the laser lens. The laser emitted by the laser lens sinters the metal powder. The installation of the air inlet 11 prevents the metal powder and dust content in the chamber from increasing due to pipe blockage or fan 5 damage, while the laser lens continues to emit laser light, which could lead to metal powder combustion or explosion. This improves the safety of the 3D printing equipment. The gas blown out from the air inlet slot 18 blows the metal powder and dust generated during the printing process to the air outlet slot 19, and then is sucked into the filter canister 3 from the air outlet slot 19. The whole process ensures that the gas in the filter canister 3 and the gas in the chamber of the 3D printing equipment are continuously circulating. The air inlet slot 18 and the air outlet slot 19 are directly opposite each other, which facilitates the continuous and effective discharge of metal powder and dust in the chamber.

[0045] Reference Figure 1 , Figure 4 An air filter 10 is installed on the filter canister 3. The air filter 10 is used to divert the gas in the filter canister 3. In this embodiment, a safety valve 20 is also installed on the filter canister 3. The safety valve 20 is set with a safety pressure value. When the pressure in the filter canister 3 exceeds the safety pressure value, the safety valve 20 automatically opens to discharge the gas in the filter canister 3, release the pressure, and prevent the filter canister 3 from exploding due to excessive pressure, thereby improving safety.

[0046] When nitrogen from the inert gas tank 2 enters the filter canister 3, the air filter 10 is turned on. The air filter 10 discharges some of the gas from the filter canister 3, which improves the safety hazard caused by excessive air pressure in the filter canister 3 when nitrogen backflushes the filter element 4. In addition, the air filter 10 filters out metal dust in the gas during the discharge process, improving the safety of the discharged gas.

[0047] Reference Figure 3 , Figure 4 A pulse valve 7 is installed on the filter barrel 3, and the inert gas tank 2 is connected to the pulse valve 7. The pulse valve 7 is used to drive the gas entering the filter barrel 3 to form an airflow pulse. A venturi tube 8 is also installed on the filter barrel 3. The venturi tube 8 is located inside the filter barrel 3 and is connected to the pulse valve 7. An explosive head 9 is connected to the end of the venturi tube 8 away from the pulse valve 7. In this embodiment, the inner diameter of the explosive head 9 gradually increases from the end near the venturi tube 8 to the end away from the venturi tube 8.

[0048] Nitrogen gas in inert gas tank 2 passes sequentially through pulse valve 7, venturi tube 8, and explosion head 9 before entering filter canister 3. When nitrogen gas passes through pulse valve 7, the diaphragm valve that generates pulses from the high-pressure gas source instantly opens and closes, causing nitrogen gas to form an airflow pulse, increasing the nitrogen pressure, thereby enhancing the backflushing effect of nitrogen gas on filter element 4 and improving the cleaning effect on filter element 4. Then, the formed airflow pulse passes through venturi tube 8 and explosion head 9, which diffuse the airflow pulse, allowing it to cover a larger area of ​​filter element 4 after entering filter canister 3, improving the cleaning effect of airflow pulse on filter element 4. Furthermore, after being pressurized by pulse valve 7 and the coverage area increased by venturi tube 8 and explosion head 9, nitrogen gas can more effectively backflush filter element 4, thereby effectively reducing the amount of nitrogen gas used.

[0049] Reference Figure 1 , Figure 4 A spiral dust collector 14 is connected to the filter cartridge 3, and an exhaust pipe 63 is connected to the spiral dust collector 14. In this embodiment, a guide pipe is installed on the filter cartridge 3, and the spiral dust collector 14 is connected to the guide pipe. The exhaust pipe 63 is connected to the feed pipe of the spiral dust collector 14 through a clamp, and a butterfly valve is installed on the guide pipe through a clamp to facilitate the operator's control of the opening and closing of the guide pipe. A collection tank 15 is detachably installed at the bottom of the spiral dust collector 14. In this embodiment, a butterfly valve is installed at the bottom of the spiral dust collector 14 to facilitate the operator's control of the connection between the spiral dust collector 14 and the collection tank 15. The collection tank 15 is installed on the butterfly valve through a clamp, so that the operator can remove the collection tank 15 and process the metal dust inside the collection tank 15.

[0050] Gas containing metal powder and fumes in the working chamber enters the spiral dust collector 14 through the exhaust duct 63. The spiral dust collector 14 causes the gas to rotate at high speed, generating centrifugal force. Due to the density difference between the gas and the metal powder, the metal powder separates from the gas. The separated metal powder falls into the collection tank 15, while the gas continues to be discharged into the filter barrel 3. This reduces the amount of metal powder entering the filter barrel 3, thereby reducing the amount of metal powder adhering to the filter element 4 and effectively extending the service life of the filter element 4. At the same time, reducing the amount of metal powder in the filter barrel 3 also prevents the metal powder from rubbing against each other in the filter barrel 3, preventing the metal powder from generating static electricity and spontaneously combusting.

[0051] Reference Figure 2 , Figure 4 A wind speed sensor 12 is installed on the air inlet duct 62. The wind speed sensor 12 is used to detect the gas flow rate in the air inlet duct 62. A frequency converter 13 is installed on the frame 1. The frequency converter 13 is electrically connected to the wind speed sensor 12 and to the fan 5. In this embodiment, the fan 5 is a variable frequency fan 5.

[0052] During the process of the fan 5 drawing airflow into the working chamber of the 3D printing equipment through the air inlet duct 62, the wind speed sensor 12 detects the wind speed in the air inlet duct 62 and then transmits the detected wind speed electrical signal to the frequency converter 13. The frequency converter 13 determines whether the wind speed is within the set range, thereby controlling the power of the fan 5 to increase or decrease, so that the airflow speed into the working chamber of the 3D printing equipment is always kept within the set range. At the same time, according to the wind speed requirements of different workpieces, the operator can easily detect the current wind speed through the wind speed sensor 12 and adjust the wind speed through the frequency converter 13 to adapt the wind speed to different needs.

[0053] Reference Figure 1 , Figure 3 The filter barrel 3 includes an outer barrel 31 and an inner liner 32. The outer barrel 31 is mounted on the frame 1, and the inner liner 32 is installed inside the outer barrel 31. The outer barrel 31 and the inner liner 32 form a channel for gas flow. The filter element 4 is installed on the inner side wall of the inner liner 32. The air outlet pipe 63 is connected to the outer barrel 31 and the channel through the air inlet pipe on the filter barrel 3. In this embodiment, the channel formed between the outer barrel 31 and the inner liner 32 is spirally wound, and the channel is connected to the filter element 4.

[0054] Gas containing metal powder and dust enters the channel between the outer barrel 31 and the inner liner 32 from the outlet pipe 63. After being dispersed through the channel, it comes into contact with the filter element 4. This prevents the gas containing metal powder and dust from concentrating on the same spot on the filter element 4, which would cause excessive metal powder to adhere to a local spot on the filter element 4 and reduce the filtration effect of the filter element 4. At the same time, it also prevents the metal powder from accumulating in a large amount in the same spot after being filtered by the filter element 4, which would cause excessive local accumulation of metal powder in the filter barrel 3 and pose a safety hazard.

[0055] A recycling tank 16 is detachably installed at the bottom of the outer barrel 31. The recycling tank 16 communicates with the channel formed between the outer barrel 31 and the inner liner 32. In this embodiment, a butterfly valve is installed at the bottom of the outer barrel 31, and the recycling tank 16 is mounted on the butterfly valve by a clamp. The butterfly valve facilitates the operator's control of the communication between the channel and the recycling tank 16, while the clamp facilitates the operator's removal of the recycling tank 16 from the outer barrel 31. Metal powder filtered through the filter screen, as well as metal powder blown off the filter screen, falls into the recycling tank 16 through the channel between the outer barrel 31 and the inner liner 32 for collection, improving the convenience for operators to collect metal powder from the filter barrel 3.

[0056] The implementation principle of Example 1 is as follows: After the operator installs the gas circulation mechanism 6 into the working chamber of the 3D printing equipment and connects all the pipes, the fan 5 is turned on. The fan 5 draws the gas in the filter bucket 3 into the working chamber. After the gas in the filter bucket 3 is drawn out, the pressure in the filter bucket 3 decreases. The gas containing metal powder and dust in the working chamber is then drawn to the spiral dust collector 14. After separation, the gas re-enters the filter bucket 3. The filter element 4 filters the metal powder in the gas again. At the same time, the nitrogen in the inert gas tank 2 is also drawn into the filter bucket 3 due to the decrease in pressure in the filter bucket 3. During the intake process, the pulse valve 7 causes the nitrogen to form an airflow pulse. The Venturi tube 8 and the explosion head 9 cause the airflow pulse to diffuse and back-blow the filter element 4, blowing away the metal powder adhering to the filter element 4. This reduces the frequency of cleaning or replacing the filter element 4, allowing the 3D printing equipment to print continuously and improving the working efficiency of the metal 3D printing equipment when printing workpieces.

[0057] Example 2

[0058] Reference Figure 5The difference between this embodiment and embodiment 1 is that an air exchange valve 21 is connected and installed on the outer barrel 31. The air exchange valve 21 is used to discharge the gas inside the outer barrel 31. An oxygen content sensor 22 for detecting the oxygen concentration inside the outer barrel 31 is also installed on the outer barrel 31. In this embodiment, the air exchange valve 21 is a one-way valve, which allows the gas inside the outer barrel 31 to be discharged through the one-way valve, but external gas cannot enter the outer barrel 31 through the one-way valve. The one-way valve is connected and installed on the side wall of the outer barrel 31 near the bottom. Because the density of air is greater than that of nitrogen, the air inside the outer barrel 31 is more easily discharged.

[0059] The implementation principle of Example 2 is as follows: Before metal 3D printing, the gas circulation mechanism 6 is installed in the working chamber of the 3D printing equipment, and then all the pipes are connected. The exhaust fan 5 is connected to the ventilation valve 21. The exhaust fan 5 draws out the gas in the outer barrel 31, reducing the pressure inside the outer barrel 31. The gas in the working chamber of the 3D printing equipment and the gas in each pipe are drawn into the outer barrel 31 and then discharged through the ventilation valve 21. At the same time, the nitrogen in the inert gas tank 2 is also drawn into the outer barrel 31. With the help of the fan 5, the gas in the working chamber and the pipes circulates rapidly, accelerating the replacement of nitrogen with the original gas. After the oxygen concentration in the outer barrel 31 is detected by the oxygen content sensor 22 to reach the required value, the exhaust fan 5 is turned off and removed. This achieves the replacement of gas in the outer barrel 31, the working chamber of the 3D printing equipment, and each pipe, increasing the nitrogen concentration in the outer barrel 31, the working chamber of the 3D printing equipment, and each pipe, thereby improving the safety of the entire metal 3D printing process.

[0060] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A printing backflush module for an intelligent metal 3D printing device, characterized in that: The device includes a frame (1), an inert gas tank (2), a filter barrel (3), a filter element (4), a fan (5), and a gas circulation mechanism (6). The inert gas tank (2) is mounted on the frame (1), the filter barrel (3) is mounted on the frame (1), and the filter barrel (3) is connected to the inert gas tank (2). The filter element (4) is mounted inside the filter barrel (3). The fan (5) is mounted on the frame (1), the air inlet of the fan (5) is connected to the filter barrel (3), and the air outlet of the fan (5) is connected to the gas circulation mechanism (6). The gas circulation mechanism (6) is located in the working chamber of the 3D printing equipment and is connected to the filter barrel (3). The gas circulation mechanism (6) includes a mounting plate (61), an air inlet pipe (62), and an air outlet pipe (63). The mounting plate (61) is detachably installed in the working chamber of the 3D printing equipment. The air inlet pipe (62) is installed on the mounting plate (61) and is connected to the air outlet of the fan (5). The air outlet pipe (63) is installed on the mounting plate (61) and is connected to the filter barrel (3). The air outlet pipe (63) is used to introduce the gas in the working chamber of the 3D printing equipment into the filter barrel (3). The mounting plate (61) is provided with a blower (11), which is connected to the air inlet pipe (62). The blower (11) is used to blow the protective lens on the laser lens away from the laser lens. The filter barrel (3) includes an outer barrel (31) and an inner liner (32). The outer barrel (31) is mounted on the frame (1), and the inner liner (32) is mounted inside the outer barrel (31). A channel for gas circulation is formed between the outer barrel (31) and the inner liner (32). The air outlet pipe (63) is connected to the outer barrel (31), and the filter element (4) is mounted on the inner liner (32).

2. The printing backflush module of an intelligent metal 3D printing device according to claim 1, characterized in that: The filter barrel (3) is equipped with a pulse valve (7), and the inert gas tank (2) is connected to the pulse valve (7). The pulse valve (7) is used to drive the gas entering the filter barrel (3) to form an airflow pulse.

3. The printing backflush module of an intelligent metal 3D printing device according to claim 2, characterized in that: The filter barrel (3) is provided with a venturi tube (8), which is connected to the pulse valve (7), and an explosion head (9) is connected to the venturi tube (8).

4. The printing backflush module of an intelligent metal 3D printing device according to claim 1, characterized in that: An air filter (10) is provided on the filter barrel (3), and the air filter (10) is used to divert the gas in the filter barrel (3).

5. The printing backflush module of an intelligent metal 3D printing device according to claim 1, characterized in that: The air inlet pipe (62) is equipped with a wind speed sensor (12) for detecting the gas flow rate in the air inlet pipe (62), and the frame (1) is equipped with a frequency converter (13). The frequency converter (13) is electrically connected to the wind speed sensor (12) and the frequency converter (13) is electrically connected to the fan (5).

6. The printing backflush module of an intelligent metal 3D printing device according to claim 1, characterized in that: A spiral dust collector (14) is connected to the filter barrel (3). A collection tank (15) is connected to and detachably installed at the bottom of the spiral dust collector (14). The air outlet pipe (63) is connected to the spiral dust collector (14).

7. The printing backflush module of an intelligent metal 3D printing device according to claim 1, characterized in that: The bottom of the outer barrel (31) is detachably provided with a recycling tank (16), which is connected to the channel formed between the recycling tank (16), the outer barrel (31) and the inner liner (32).

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