A filtering device for a metal 3D printer

Abstract

The present invention discloses a filtering device for a metal 3D printer, which relates to the technical field of 3D printing. It includes a printing dust suction mechanism and a printer housing installed outside the printing dust suction mechanism. A filtering mechanism is provided at the top of the printing dust suction mechanism, and a flue gas purification box is provided on one side of the filtering mechanism. The printing dust suction mechanism includes a printer plate. A printer body is fixedly installed at the center position of the bottom of the printer plate. An inert gas source is fixedly installed outside the printer plate. Among them, a plurality of connecting pipes are fixedly connected to the bottom of the inert gas source. The end of the connecting pipe is fixedly installed with an air delivery ring. Inert gas is generated by the inert gas source and conveyed to the inside of the air delivery ring through the connecting pipe, and is mixed with the flue gas and metal powder absorbed inside the first air inlet hole to protect the metal powder, which can effectively reduce the concentration of the metal powder and avoid the risk of explosion caused by too high a concentration of the metal powder.

Description

Technical Field

[0001] The invention relates to the technical field of 3D printing, and in particular to a filtering device for a metal 3D printer. Background Art

[0002] Metal 3D printing uses metal powder as the printing material. According to the design model, the high temperature of the laser beam is used to sinter the metal powder in a specific area to produce a product with a specific structure. Specifically, before the laser beam starts scanning, the powder spreading device first pushes the metal powder onto the base plate of the forming cylinder. The laser beam then selects and melts the metal powder on the base plate according to the filling contour line of the current layer to process the current layer. Then the forming cylinder descends a layer thickness, the powder cylinder rises a layer thickness, and the powder spreading device spreads the metal powder on the processed current layer. The 3D printing equipment calls in the data of the next layer contour to proceed. 3D printing is carried out layer by layer until the entire part is processed and metal 3D printing is completed. The entire printing process needs to be carried out in a processing room protected by inert gas to avoid the metal powder from reacting with the active gas at high temperature or even exploding, thereby ensuring the safety of the processing process. Since smoke will be generated during the sintering of metal powder, and metal dust will fly during the powder laying process, the smoke in the processing room will affect the propagation of the laser beam, thereby reducing the accuracy of metal 3D printing and the quality of the workpiece. Therefore, the inert gas in the processing room needs to be dusted and purified.

[0003] Announcement No. CN214019915U discloses a filtering device for a metal 3D printer, which is provided with an electromagnet adsorption device to adsorb unreacted metal powder in dust-containing gas, and a cylindrical filter element is provided to increase the contact area between the dust-containing gas and the filter element, thereby improving the filtration efficiency, extending the service life of the filter element, and reducing the cost. A collection mechanism is provided to recollect the unreacted metal powder and reduce material waste. The device purifies and removes dust from the dust-containing gas, recovers the inert gas, and realizes the recycling of the inert gas. However, the patent still has the following problems in actual use:

[0004] Although the filtering device of the metal 3D printer can adsorb metal powder through the electromagnet adsorption device, during the process of absorbing the flue gas, the metal powder will be inhaled together with the flue gas, and the concentration of the inhaled metal powder cannot be guaranteed, thereby causing an explosion, which is not conducive to the operational safety of the metal 3D printer.

[0005] Therefore, a filtering device for a metal 3D printer is proposed to solve the above-mentioned problems. Summary of the invention

[0006] The object of the present invention is to provide a filtering device for a metal 3D printer, so as to solve the problem in the above-mentioned background technology that during the absorption of flue gas, metal powder will be inhaled together with the flue gas, the concentration of the inhaled metal powder cannot be guaranteed, resulting in an explosion phenomenon, which is not conducive to the operation safety of the metal 3D printer.

[0007] To achieve the above object, the present invention provides the following technical solution: A filtering device for a metal 3D printer, including a printing dust suction mechanism, and a printer housing installed outside the printing dust suction mechanism;

[0008] A filtering mechanism is arranged at the top of the printing dust suction mechanism, and a flue gas purification box is arranged on one side of the filtering mechanism;

[0009] It also includes:

[0010] The printing dust suction mechanism includes a printer tray, a printer body is fixedly installed at the center position of the bottom of the printer tray, and an inert gas source is fixedly installed outside the printer tray;

[0011] Wherein, a plurality of connecting pipes are fixedly connected to the bottom of the inert gas source, an air delivery ring is fixedly installed at the end of the connecting pipe, and the air delivery ring is fixedly installed at the bottom of the printer tray;

[0012] Wherein, fixed brackets are symmetrically installed on one side of the bottom of the air delivery ring, a switching motor is fixedly installed outside the fixed brackets, and an output end of the switching motor is fixedly connected to a switching worm;

[0013] One side of the switching worm is meshed with a switching worm gear, the switching worm gear is rotationally connected to the printer tray and the air delivery ring, a plurality of first air inlet holes are opened inside the switching worm gear, and a plurality of dispersed air inlet holes are opened inside the printer tray, and the number of the dispersed air inlet holes is more than the number of the first air inlet holes;

[0014] A telescopic snake-shaped pipe is fixedly installed at the top of the printer tray close to the dispersed air inlet holes, a top fixing ring is fixedly installed at the top of the telescopic snake-shaped pipe, a connecting disc is threadedly connected to the top of the top fixing ring, a filter screen is fixedly installed at the center position inside the connecting disc, and a collecting disc is threadedly connected to the inner side of the bottom of the top fixing ring;

[0015] A cleaning motor is fixedly installed at the center position of the bottom of the collecting disc, an output end of the cleaning motor is fixedly connected to a cleaning rotating rod, a cleaning spiral blade is fixedly installed at the top of the cleaning rotating rod, the cleaning spiral blade is attached to the bottom of the filter screen, support legs are fixedly installed around the bottom of the printer housing, and a placing disc is fixedly installed inside the bottom of the printer housing;

[0016] A first sealing cover is rotatably connected to the front of the printer housing. A circulation hole is provided on one side of the bottom of the printer housing. A lifting bracket is fixedly installed on the inner side of the back of the printer housing. A lifting motor is fixedly installed on the top of the lifting bracket. The output end of the lifting motor is fixedly connected to a lifting threaded rod. An outer side of the lifting threaded rod is threadedly connected to a lifting threaded sleeve. An outer side of the lifting threaded sleeve is fixedly installed with a lifting sliding sleeve. A limiting sliding rod is slidably connected inside the lifting sliding sleeve. The lifting sliding sleeve is fixedly connected to the printer tray.

[0017] Preferably, the filtering mechanism includes an air suction hood. The air suction hood is fixedly installed on the top of the connecting disk. The air suction hood is fixedly connected to the printer housing. A fan bracket is fixedly installed inside the air suction hood. An air suction fan is fixedly installed inside the fan bracket. A metal powder collection hood is fixedly installed on the top of the air suction hood. A gas guide pipe is fixedly installed on one side of the metal powder collection hood. A collection groove is fixedly installed on the side of the metal powder collection hood away from the gas guide pipe. A closing plug is snap-fitted to the end of the collection groove.

[0018] Preferably, a collection frame is provided at the bottom of the air suction hood near the collection groove. A rotation motor is fixedly installed on the front of the metal powder collection hood. The output end of the rotation motor is fixedly connected to a rotation connection shaft. A plurality of electromagnetic adsorption nets are fixedly installed on the outer side of the rotation connection shaft. An arc-shaped plate is fixedly installed at the end of the electromagnetic adsorption net. Cleaning sliding grooves are provided on both sides of the electromagnetic adsorption net. A cleaning scraper is slidably connected inside the cleaning sliding groove. The cleaning scraper is attached to the surface of the electromagnetic adsorption net.

[0019] Preferably, the flue gas purification box is fixedly installed at the bottom of the collection groove. Reinforcing support rods are symmetrically installed at the bottom of the collection groove. The reinforcing support rods are fixedly connected to the printer housing. A plurality of installation grooves are provided inside the flue gas purification box. A second sealing cover is snap-fitted to one side of the installation groove. An installation block is fixedly installed on the side of the installation groove away from the second sealing cover. A purification activated carbon plate is snap-fitted inside the installation block. A pull block is fixedly installed at the end of the purification activated carbon plate.

[0020] Preferably, a pull groove is provided at the bottom of the pull block. The pull block is slidably connected to the installation groove. Fixing grooves are symmetrically provided at the top of the pull block. Fixing springs are fixedly installed inside the fixing grooves. Fixing protrusions are fixedly installed at the top of the fixing springs. The fixing protrusions are snap-fitted to the flue gas purification box. A circulation pipe is fixedly installed at the bottom of the flue gas purification box. The circulation pipe is fixedly connected to the printer housing through the circulation hole.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: For a filtering device used in a metal 3D printer, multiple air holes are used to absorb the flue gas and metal powder generated during 3D printing respectively. When absorbing the flue gas and metal powder, inert gas is generated by an inert gas source and transported through a connecting pipe to the inside of the gas transmission ring, where it is mixed with the flue gas and metal powder absorbed inside the first air inlet hole to protect the metal powder, effectively reducing the concentration of the metal powder and avoiding the risk of explosion due to excessive metal powder concentration. At the same time, the electromagnetic adsorption net generates suction force after being electrified to absorb the metal powder, and the flue gas and fine particle impurities enter the flue gas purification box through the electromagnetic adsorption net and the air guide pipe for purification. The specific content is as follows:

[0022] 1. By setting up a printing dust collection mechanism, not only can the switching motor be started to drive the switching worm to rotate during 3D printing. Utilizing the meshing connection between the switching worm and the switching worm gear, the switching worm gear drives the first air inlet hole to rotate. Multiple air holes are used to absorb the flue gas and metal powder generated during 3D printing respectively. When absorbing the flue gas and metal powder, inert gas is generated by an inert gas source and transported through a connecting pipe to the inside of the gas transmission ring, where it is mixed with the flue gas and metal powder absorbed inside the first air inlet hole to protect the metal powder, effectively reducing the concentration of the metal powder and avoiding the risk of explosion due to excessive metal powder concentration. At the same time, the multiple dispersed air inlet holes at the bottom of the printer disk are used for secondary dispersion of the metal powder, further reducing the concentration of the metal powder and improving the safety during 3D printing. The inhaled flue gas and metal powder are transported through a telescopic snake-shaped pipe. The large particle impurities generated during 3D printing can be filtered through a filter screen. At the same time, the cleaning motor is started to drive the cleaning rotating rod and the cleaning spiral blade to rotate. The cleaning spiral blade can clean the large particle impurities on the surface of the filter screen, causing the large particle impurities to fall into the collection tray for collection. The printer cover can be closed through the first sealing cover, enabling the inert gas to fill the inside of the printer cover and further improving the safety of 3D printing. The lifting motor drives the lifting threaded rod to rotate, causing the lifting threaded sleeve to move up and down on the outside of the lifting threaded rod while driving the lifting sliding sleeve to move up and down. Under the action of the limit sliding rod, the lifting sliding sleeve drives the printer disk and the printer body to move up and down, thereby performing 3D printing;

[0023] 2. By setting up a filtering mechanism, not only can a moving suction force be generated by the suction fan inside the suction hood to absorb the flue gas generated by 3D printing, but also the suction force generated after the electromagnetic adsorption net is electrified can be used to absorb metal powder. At the same time, the flue gas and fine particle impurities enter the flue gas purification box through the electromagnetic adsorption net and the air duct for purification. When the electromagnetic adsorption net adsorbs a certain amount of metal powder, the rotation motor is started to drive the rotation connecting shaft and the electromagnetic adsorption net to rotate, enabling the switching of multiple electromagnetic adsorption nets, thereby achieving continuous absorption of metal powder. When the electromagnetic adsorption net rotates to the side close to the collection tank, the electromagnetic adsorption net is powered off. At this time, the electromagnetic adsorption net loses its magnetic force, and at the same time, under the action of the cleaning chute and weight, the cleaning scraper slides along the cleaning chute to clean the metal powder into the collection tank for collection. When a certain amount of metal powder is collected in the collection tank, the sealing plug is opened to make the metal powder fall into the collection frame for recycling of the metal powder. The toxic gases in the flue gas can be purified by the purification activated carbon plate inside the flue gas purification box, and at the same time, the fine particle impurities in the flue gas can be filtered. At the same time, the inert gas can be recycled by using the circulation pipe. When it is necessary to clean and replace the purification activated carbon plate, the second sealing cover is opened, and the pull-out block and the purification activated carbon plate are pulled out from the inside of the installation groove by using the pull-out groove, so as to facilitate the cleaning or replacement of the purification activated carbon plate. The positioning installation of the pull-out block can be realized by using the fixing spring and the fixing protrusion, which is convenient for the quick installation of the purification activated carbon plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is the overall three-dimensional structure schematic diagram of the present invention;

[0025] Figure 2 is the three-dimensional structure schematic diagram of the cross-section of the printing dust suction mechanism in the present invention;

[0026] Figure 3 is the three-dimensional structure schematic diagram of the printer tray in the present invention;

[0027] Figure 4 is the three-dimensional structure schematic diagram of the inert gas source and the connecting pipe in the present invention;

[0028] Figure 5 is the three-dimensional structure schematic diagram of the telescopic snake-shaped pipe in the present invention;

[0029] Figure 6 is the three-dimensional structure schematic diagram of the cross-section of the collection tray in the present invention;

[0030] Figure 7 is the three-dimensional structure schematic diagram of the cross-section of the lifting bracket in the present invention;

[0031] Figure 8 is the three-dimensional structure schematic diagram of the filtering mechanism in the present invention;

[0032] Figure 9 This is a three-dimensional sectional structure diagram of the suction hood and the metal powder collection hood in the present invention;

[0033] Figure 10 This is a three-dimensional sectional structure diagram of the flue gas purification box in the present invention;

[0034] Figure 11 This is a three-dimensional sectional structure diagram of the pull-out block in the present invention.

[0035] In the figure: 1. Printing dust collection mechanism; 101. Printer tray; 102. Printer body; 103. Inert gas source; 104. Connecting pipe; 105. Gas transmission ring; 106. Fixed bracket; 107. Switching motor; 108. Switching worm; 109. Switching worm gear; 110. First air inlet; 111. Dispersed air inlet; 112. Telescopic snake-shaped pipe; 113. Top fixing ring; 114. Connecting plate; 115. Filter screen; 116. Collection tray; 117. Cleaning motor; 118. Cleaning rotating rod; 119. Cleaning spiral blade; 120. Printer cover; 121. Support leg; 122. Placing tray; 123. First sealing cover; 124. Circulation hole; 125. Lifting bracket; 126. Lifting motor; 127. Lifting threaded rod; 128. Lifting threaded sleeve; 129. Lifting sliding sleeve; 130. Limit sliding rod; 2. Filter mechanism; 201. Suction hood; 202. Fan bracket; 203. Suction fan; 204. Metal powder collection hood; 205. Air duct; 206. Collection tank; 207. Sealing plug; 208. Collection frame; 209. Rotating motor; 210. Rotating connecting shaft; 211. Electromagnetic adsorption net; 212. Arc plate; 213. Cleaning chute; 214. Cleaning scraper; 215. Flue gas purification box; 216. Reinforcing support rod; 217. Installation groove; 218. Second sealing cover; 219. Installation block; 220. Purifying activated carbon plate; 221. Pull-out block; 222. Pull-out groove; 223. Fixed groove; 224. Fixed spring; 225. Fixed protrusion; 226. Circulation pipe. Detailed implementation manners

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0037] Please refer to Figures 1-5, the present invention provides a technical solution: a filtering device for a metal 3D printer, including a printing dust suction mechanism 1 and a printer cover 120 installed outside the printing dust suction mechanism 1. A filtering mechanism 2 is provided at the top of the printing dust suction mechanism 1, and a flue gas purification box 215 is provided on one side of the filtering mechanism 2. The printing dust suction mechanism 1 includes a printer tray 101. A printer body 102 is fixedly installed at the center of the bottom of the printer tray 101. An inert gas source 103 is fixedly installed outside the printer tray 101. Among them, a plurality of connecting pipes 104 are fixedly connected to the bottom of the inert gas source 103. An air delivery ring 105 is fixedly installed at the end of the connecting pipe 104. The air delivery ring 105 is fixedly installed at the bottom of the printer tray 101. Among them, fixed brackets 106 are symmetrically installed on one side of the bottom of the air delivery ring 105. A switching motor 107 is fixedly installed outside the fixed brackets 106. An output end of the switching motor 107 is fixedly connected to a switching worm 108. A switching worm gear 109 is meshed and connected to one side of the switching worm 108. The switching worm gear 109 is rotationally connected to the printer tray 101 and the air delivery ring 105. A plurality of first air intake holes 110 are formed inside the switching worm gear 109. A plurality of dispersed air intake holes 111 are formed inside the printer tray 101. The number of the dispersed air intake holes 111 is more than that of the first air intake holes 110. When performing 3D printing, the switching motor 107 is started to drive the switching worm 108 to rotate. By using the meshing connection characteristic between the switching worm 108 and the switching worm gear 109, the switching worm gear 109 drives the first air intake holes 110 to rotate. The flue gas and metal powder generated by 3D printing are absorbed through a plurality of air holes respectively. When absorbing the flue gas and metal powder, inert gas is generated by the inert gas source 103 and conveyed to the inside of the air delivery ring 105 through the connecting pipe 104, and is mixed with the flue gas and metal powder absorbed inside the first air intake holes 110 to protect the metal powder, which can effectively reduce the concentration of the metal powder, avoid the risk of explosion caused by too high concentration of the metal powder, and at the same time, the metal powder is secondarily dispersed by a plurality of dispersed air intake holes 111 at the bottom of the printer tray 101 to further reduce the concentration of the metal powder and improve the safety during 3D printing.

[0038] Please refer to Figures 2-6, a telescopic snake-shaped pipe 112 is fixedly installed at the top of the printer tray 101 near the dispersion air inlet 111. A top fixing ring 113 is fixedly installed at the top of the telescopic snake-shaped pipe 112. A connecting plate 114 is threadedly connected to the top of the top fixing ring 113. A filter screen 115 is fixedly installed at the center position inside the connecting plate 114. A collecting tray 116 is threadedly connected to the inner bottom of the top fixing ring 113. A cleaning motor 117 is fixedly installed at the center position of the bottom of the collecting tray 116. The output end of the cleaning motor 117 is fixedly connected to a cleaning rotating rod 118. A cleaning spiral blade 119 is fixedly installed at the top of the cleaning rotating rod 118. The cleaning spiral blade 119 is in fitting connection with the bottom of the filter screen 115. Support legs 121 are fixedly installed around the bottom of the printer cover 120. A placement tray 122 is fixedly installed inside the bottom of the printer cover 120. A first sealing cover 123 is rotatably connected to the front of the printer cover 120. A circulation hole 124 is provided on one side of the bottom of the printer cover 120. The suctioned flue gas and metal powder are conveyed through the telescopic snake-shaped pipe 112. The large-particle impurities generated by 3D printing can be filtered through the filter screen 115. At the same time, the cleaning motor 117 is started to drive the cleaning rotating rod 118 and the cleaning spiral blade 119 to rotate. The large-particle impurities on the surface of the filter screen 115 can be cleaned by the cleaning spiral blade 119, so that the large-particle impurities fall into the collecting tray 116 for collection. The printer cover 120 can be closed through the first sealing cover 123, so that the inert gas can fill the inside of the printer cover 120, further improving the safety of 3D printing.

[0039] Please refer to Figures 2-7 , a lifting bracket 125 is fixedly installed inside the back of the printer cover 120. A lifting motor 126 is fixedly installed at the top of the lifting bracket 125. The output end of the lifting motor 126 is fixedly connected to a lifting threaded rod 127. A lifting threaded sleeve 128 is threadedly connected to the outside of the lifting threaded rod 127. A lifting sliding sleeve 129 is fixedly installed on the outside of the lifting threaded sleeve 128. A limiting sliding rod 130 is slidably connected inside the lifting sliding sleeve 129. The lifting sliding sleeve 129 is fixedly connected to the printer tray 101. By driving the lifting threaded rod 127 to rotate through the lifting motor 126, the lifting threaded sleeve 128 moves up and down on the outside of the lifting threaded rod 127 while driving the lifting sliding sleeve 129 to move up and down. Under the action of the limiting sliding rod 130, the lifting sliding sleeve 129 drives the printer tray 101 and the printer body 102 to move up and down, so as to perform 3D printing.

[0040] Please refer to Figure 1 , Figures 8-9, the filtering mechanism 2 includes a suction hood 201. The suction hood 201 is fixedly installed on the top of the connecting plate 114. The suction hood 201 is fixedly connected to the printer housing 120. Inside the suction hood 201, a fan bracket 202 is fixedly installed. Inside the fan bracket 202, a suction fan 203 is fixedly installed. On the top of the suction hood 201, a metal powder collection hood 204 is fixedly installed. On one side of the metal powder collection hood 204, a gas guide pipe 205 is fixedly installed. On the side of the metal powder collection hood 204 away from the gas guide pipe 205, a collection trough 206 is fixedly installed. At the end of the collection trough 206, a sealing plug 207 is snap-connected. Near the bottom of the suction hood 201 close to the collection trough 206, a collection frame 208 is provided. On the front of the metal powder collection hood 204, a rotation motor 209 is fixedly installed. The output end of the rotation motor 209 is fixedly connected to a rotation connecting shaft 210. On the outside of the rotation connecting shaft 210, a number of electromagnetic adsorption nets 211 are fixedly installed. At the end of the electromagnetic adsorption net 211, an arc-shaped plate 212 is fixedly installed. On both sides of the electromagnetic adsorption net 211, cleaning sliding grooves 213 are provided. Inside the cleaning sliding grooves 213, cleaning scrapers 214 are slidably connected. The cleaning scrapers 214 are in surface contact with the electromagnetic adsorption nets 211. A flue gas purification box 215 is fixedly installed at the bottom of the collection trough 206. Using the suction force generated by the suction fan 203 inside the suction hood 201, the flue gas generated by 3D printing is absorbed. At the same time, the suction force generated after the electromagnetic adsorption nets 211 are electrified is used to absorb metal powder. At the same time, the flue gas and fine particle impurities enter the flue gas purification box 215 through the electromagnetic adsorption nets 211 and the gas guide pipe 205 for purification. When a certain amount of metal powder is adsorbed by the electromagnetic adsorption nets 211, the rotation motor 209 is started to drive the rotation connecting shaft 210 and the electromagnetic adsorption nets 211 to rotate, enabling the switching of multiple electromagnetic adsorption nets 211, thereby realizing uninterrupted metal powder absorption. When the electromagnetic adsorption net 211 rotates to the side close to the collection trough 206, the electromagnetic adsorption net 211 is powered off. At this time, the electromagnetic adsorption net 211 loses its magnetic force. At the same time, under the action of the cleaning sliding grooves 213 and the weight, the cleaning scrapers 214 slide along the cleaning sliding grooves 213 to clean the metal powder into the collection trough 206 for collection. When a certain amount of metal powder is collected in the collection trough 206, the sealing plug 207 is opened to allow the metal powder to fall into the collection frame 208 for recycling of the metal powder.

[0041] Please refer to Figures 9-11, reinforcing support rods 216 are symmetrically installed at the bottom of the collection tank 206. The reinforcing support rods 216 are fixedly connected to the printer housing 120. A number of installation slots 217 are provided inside the flue gas purification box 215. A second sealing cover 218 is snap-connected to one side of the installation slot 217. An installation block 219 is fixedly installed on the side of the installation slot 217 away from the second sealing cover 218. A purification activated carbon plate 220 is snap-connected inside the installation block 219. A pull-out block 221 is fixedly installed at the end of the purification activated carbon plate 220. A pull-out slot 222 is opened at the bottom of the pull-out block 221. The pull-out block 221 is slidably connected to the installation slot 217. Fixing slots 223 are symmetrically opened at the top of the pull-out block 221. A fixing spring 224 is fixedly installed inside the fixing slot 223. A fixing protrusion 225 is fixedly installed at the top of the fixing spring 224. The fixing protrusion 225 is snap-connected to the flue gas purification box 215. A circulation pipe 226 is fixedly installed at the bottom of the flue gas purification box 215. The circulation pipe 226 is fixedly connected to the printer housing 120 through a circulation hole 124. The toxic gases in the flue gas can be purified by the purification activated carbon plate 220 inside the flue gas purification box 215, and at the same time, the fine particle impurities in the flue gas can be filtered. At the same time, the inert gas can be recycled by using the circulation pipe 226. When it is necessary to clean and replace the purification activated carbon plate 220, the second sealing cover 218 is opened, and the pull-out block 221 and the purification activated carbon plate 220 are pulled out from the inside of the installation slot 217 by using the pull-out slot 222, so as to facilitate the cleaning or replacement of the purification activated carbon plate 220. The positioning installation of the pull-out block 221 can be realized by using the fixing spring 224 and the fixing protrusion 225, which is convenient for the quick installation of the purification activated carbon plate 220.

[0042] Working principle: Before using this filtering device for a metal 3D printer, it is necessary to first check the overall condition of the device to ensure that it can work properly. According to Figure 1 - Figure 11As shown in the figure, first, when performing 3D printing, start the switching motor 107 to drive the switching worm 108 to rotate. Utilizing the meshing connection between the switching worm 108 and the switching worm gear 109, the switching worm gear 109 drives the first air inlet hole 110 to rotate, and the flue gas and metal powder generated during 3D printing are absorbed through multiple air holes. When absorbing the flue gas and metal powder, inert gas is generated by the inert gas source 103 and transported through the connecting pipe 104 to the inside of the gas transmission ring 105, where it is mixed with the flue gas and metal powder absorbed inside the first air inlet hole 110 to protect the metal powder, effectively reducing the concentration of the metal powder and avoiding the risk of explosion due to excessive metal powder concentration. At the same time, the metal powder is secondarily dispersed through multiple dispersion air inlet holes 111 at the bottom of the printer tray 101, further reducing the concentration of the metal powder and improving the safety during 3D printing. The inhaled flue gas and metal powder are transported through the telescopic snake-shaped pipe 112, and the large particle impurities generated during 3D printing can be filtered through the filter net 115. At the same time, start the cleaning motor 117 to drive the cleaning rotating rod 118 and the cleaning spiral blade 119 to rotate. The cleaning spiral blade 119 can clean the large particle impurities on the surface of the filter net 115, causing the large particle impurities to fall into the collection tray 116 for collection.

[0043] Secondly, the printer cover 120 can be closed through the first sealing cover 123, enabling the inert gas to fill the inside of the printer cover 120, further improving the safety of 3D printing. The lifting motor 126 drives the lifting threaded rod 127 to rotate, causing the lifting threaded sleeve 128 to move up and down on the outside of the lifting threaded rod 127 while driving the lifting sliding sleeve 129 to move up and down. Under the action of the limit sliding rod 130, the lifting sliding sleeve 129 drives the printer tray 101 and the printer body 102 to move up and down, thereby performing 3D printing. The suction fan 203 inside the suction hood 201 generates a moving suction force to absorb the flue gas generated during 3D printing. At the same time, the suction force generated after the electromagnetic adsorption net 211 is energized is used to absorb the metal powder. At the same time, the flue gas and fine particle impurities enter the flue gas purification box 215 through the electromagnetic adsorption net 211 and the air guide pipe 205 for purification. When the electromagnetic adsorption net 211 adsorbs a certain amount of metal powder, start the rotating motor 209 to drive the rotating connecting shaft 210 and the electromagnetic adsorption net 211 to rotate, which can realize the switching of multiple electromagnetic adsorption nets 211, thus achieving continuous absorption of metal powder.

[0044] Finally, when the electromagnetic adsorption net 211 rotates to the side close to the collection tank 206, the electromagnetic adsorption net 211 is powered off. At this time, the electromagnetic adsorption net 211 loses its magnetic force. At the same time, under the action of the cleaning chute 213 and the weight, the cleaning blade 214 slides along the cleaning chute 213 to clean the metal powder into the collection tank 206 for collection. When a certain amount of metal powder is collected in the collection tank 206, the sealing plug 207 is opened to make the metal powder fall into the collection frame 208 for recycling of the metal powder. The purification activated carbon plate 220 inside the flue gas purification box 215 can purify the toxic gases in the flue gas, and at the same time can filter the fine particle impurities in the flue gas. At the same time, the inert gas can be recycled by using the circulation pipe 226. When it is necessary to clean and replace the purification activated carbon plate 220, the second sealing cover 218 is opened, and the pull block 221 and the purification activated carbon plate 220 are pulled out from the inside of the installation groove 217 by using the pull groove 222, so as to facilitate the cleaning or replacement of the purification activated carbon plate 220. The positioning installation of the pull block 221 can be realized by using the fixed spring 224 and the fixed protrusion 225, which is convenient for the rapid installation of the purification activated carbon plate 220.

[0045] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A filtering device for a metal 3D printer, comprising a printing dust suction mechanism (1) and a printer housing (120) installed outside the printing dust suction mechanism (1); A filtering mechanism (2) is provided at the top of the printing dust suction mechanism (1), and a flue gas purification box (215) is provided on one side of the filtering mechanism (2); It is characterized in that: The printing dust suction mechanism (1) includes a printer tray (101). A printer body (102) is fixedly installed at the center of the bottom of the printer tray (101), and an inert gas source (103) is fixedly installed outside the printer tray (101); Among them, a plurality of connecting pipes (104) are fixedly connected to the bottom of the inert gas source (103). An air delivery ring (105) is fixedly installed at the end of the connecting pipe (104), and the air delivery ring (105) is fixedly installed at the bottom of the printer tray (101); Among them, fixed brackets (106) are symmetrically installed on one side of the bottom of the air delivery ring (105). A switching motor (107) is fixedly installed outside the fixed brackets (106), and an output end of the switching motor (107) is fixedly connected to a switching worm (108); One side of the switching worm (108) is meshed with a switching worm gear (109). The switching worm gear (109) is rotationally connected to the printer tray (101) and the air delivery ring (105). A plurality of first air inlet holes (110) are formed inside the switching worm gear (109), and a plurality of dispersed air inlet holes (111) are formed inside the printer tray (101). The number of the dispersed air inlet holes (111) is more than that of the first air inlet holes (110); A telescopic snake-shaped pipe (112) is fixedly installed at the top of the printer tray (101) close to the dispersed air inlet holes (111). A top fixing ring (113) is fixedly installed at the top of the telescopic snake-shaped pipe (112). A connecting disk (114) is threadedly connected to the top of the top fixing ring (113). A filter screen (115) is fixedly installed at the center of the inside of the connecting disk (114). A collecting disk (116) is threadedly connected to the inner side of the bottom of the top fixing ring (113); A cleaning motor (117) is fixedly installed at the center of the bottom of the collecting disk (116). An output end of the cleaning motor (117) is fixedly connected to a cleaning rotating rod (118). A cleaning spiral blade (119) is fixedly installed at the top of the cleaning rotating rod (118). The cleaning spiral blade (119) is in fit connection with the bottom of the filter screen (115). Support legs (121) are fixedly installed around the bottom of the printer housing (120), and a placing disk (122) is fixedly installed inside the bottom of the printer housing (120); A first sealing cover (123) is rotatably connected to the front of the printer housing (120). A circulation hole (124) is formed in one side of the bottom of the printer housing (120). A lifting bracket (125) is fixedly installed on the inner side of the back of the printer housing (120). A lifting motor (126) is fixedly installed on the top of the lifting bracket (125). The output end of the lifting motor (126) is fixedly connected to a lifting threaded rod (127). A lifting threaded sleeve (128) is threadedly connected to the outer side of the lifting threaded rod (127). A lifting sliding sleeve (129) is fixedly installed on the outer side of the lifting threaded sleeve (128). A limiting sliding rod (130) is slidably connected to the inside of the lifting sliding sleeve (129). The lifting sliding sleeve (129) is fixedly connected to the printer tray (101).

2. The filtering device for a metal 3D printer according to claim 1, wherein: The filtering mechanism (2) includes an air suction hood (201). The air suction hood (201) is fixedly installed on the top of the connecting plate (114). The air suction hood (201) is fixedly connected to the printer housing (120). A fan bracket (202) is fixedly installed inside the air suction hood (201). An air suction fan (203) is fixedly installed inside the fan bracket (202). A metal powder collection hood (204) is fixedly installed on the top of the air suction hood (201). A gas guide pipe (205) is fixedly installed on one side of the metal powder collection hood (204). A collection groove (206) is fixedly installed on the side of the metal powder collection hood (204) away from the gas guide pipe (205). A closing plug (207) is snap-connected to the end of the collection groove (206).

3. The filtering device for a metal 3D printer according to claim 2, wherein: A collection frame (208) is arranged at the bottom of the air suction hood (201) close to the collection groove (206). A rotation motor (209) is fixedly installed on the front of the metal powder collection hood (204). The output end of the rotation motor (209) is fixedly connected to a rotation connection shaft (210). A plurality of electromagnetic adsorption nets (211) are fixedly installed on the outer side of the rotation connection shaft (210). An arc-shaped plate (212) is fixedly installed at the end of the electromagnetic adsorption net (211). Cleaning sliding grooves (213) are formed on both sides of the electromagnetic adsorption net (211). A cleaning scraper (214) is slidably connected to the inside of the cleaning sliding groove (213). The cleaning scraper (214) is attached to the surface of the electromagnetic adsorption net (211).

4. The filtering device for a metal 3D printer according to claim 3, characterized in that: The flue gas purification box (215) is fixedly installed at the bottom of the collection tank (206). Reinforcing support rods (216) are symmetrically installed at the bottom of the collection tank (206). The reinforcing support rods (216) are fixedly connected to the printer housing (120). A number of installation grooves (217) are formed inside the flue gas purification box (215). A second sealing cover (218) is snap-fitted on one side of the installation groove (217). An installation block (219) is fixedly installed on the side of the installation groove (217) away from the second sealing cover (218). A purification activated carbon plate (220) is snap-fitted inside the installation block (219). A pull-out block (221) is fixedly installed at the end of the purification activated carbon plate (220).

5. The filtering device for a metal 3D printer according to claim 4, characterized in that: A pull-out groove (222) is formed at the bottom of the pull-out block (221). The pull-out block (221) is slidably connected to the installation groove (217). Fixing grooves (223) are symmetrically formed at the top of the pull-out block (221). A fixing spring (224) is fixedly installed inside the fixing groove (223). A fixing protrusion (225) is fixedly installed at the top of the fixing spring (224). The fixing protrusion (225) is snap-fitted with the flue gas purification box (215). A circulation pipe (226) is fixedly installed at the bottom of the flue gas purification box (215). The circulation pipe (226) is fixedly connected to the printer housing (120) through a circulation hole (124).

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