Uninterruptedly-operating filtering and circulating device and metal additive manufacturing equipment applying same

Abstract

The utility model discloses an uninterruptedly-operating filtering circulating device and metal additive manufacturing equipment applying the uninterruptedly-operating filtering circulating device, the uninterruptedly-operating filtering circulating device comprises a box body, and a fixing support, a first filtering module, a second filtering module, a third filtering module, a circulating module and a backflushing module are arranged in the box body. The 3D printing machine has the beneficial effects that when any one of the first waste collecting tank and the second waste collecting tank in the second filtering module is used, the other one can be used as a standby, so that in the 3D printing process, the situation that the machine is shut down specially for replacing a filter element in the tank, and consequently the 3D printing procedure is paused is avoided; and the arranged back-flushing module serves as a power source and is used for back-flushing blanking of the second filtering module, metal dust of the second filtering module can be vibrated under the action of the back-flushing module, the blanking is gathered at the bottom of the second filtering module, and the service life of the second filtering module is prolonged.

Description

Technical Field

[0001] The present application belongs to the field of 3D printing technology, and in particular relates to an uninterrupted filtering circulation device and a metal additive manufacturing device using the same. Background Art

[0002] Selective laser melting (SLM) technology is the most mainstream technology used in metal 3D printers today. It can directly obtain functional parts of almost any shape and complete metallurgical bonding, with a density of nearly 100%, a dimensional accuracy of 20-50 microns, and a surface roughness of 20-30 microns. It is a rapid prototyping technology with great development prospects, and its application range has been expanded to aerospace, medical, automotive, molds and other fields. Therefore, the research and development of selective laser melting (SLM) equipment has also become a hot spot in the field of rapid prototyping at home and abroad.

[0003] SLM laser selective melting technology converts the 3D data of an object into 2D data of layers of cross sections through a computer and transmits it to the printer. During the printing process, a scraper is used to spread metal powder of a set thickness on the substrate. The focused laser is scanned according to the pre-planned path and process parameters under the control of the scanning galvanometer. The metal powder melts under the irradiation of the high-energy laser and solidifies quickly to form a metallurgical bonding layer. When a layer of printing is completed, the substrate drops a slice layer thickness, the scraper continues to spread the powder, and the laser scans and processes, and the process is repeated until the entire part is printed.

[0004] During the processing, inert gas needs to be introduced into the equipment to maintain the sealing state inside the equipment. After printing is completed, the exhaust gas in the equipment needs to be extracted. This exhaust gas is generally a mixture of inert gas and metal dust. For cost and environmental considerations, the above exhaust gas needs to be filtered and recycled. The collected dust can be used for sintering again, and the filtered inert gas can continue to be introduced into the 3D printing equipment for continued use.

[0005] In addition, for cost and production stability considerations, the waste collection tank should be used as long as possible. In the prior art, after a long period of 3D printing, the machine needs to be shut down to replace the filter element in the waste collection tank. The machine shutdown will delay the normal 3D printing process, affect the printing efficiency, and ultimately increase the production cost of the printed product. Summary of the invention

[0006] The purpose of this application is to provide an uninterrupted filtering circulation device and a metal additive manufacturing device using the same to solve the above-mentioned technical problems.

[0007] The uninterruptedly operating filtering circulation device comprises a box body, and a fixed bracket is arranged in the box body;

[0008] A first filter module, which is located in the box and is used to initially separate gas and solid matter in the smoke;

[0009] A second filter module, the second filter module is located on one side of the first filter module, one end of the second filter module is connected to the first filter module, and the second filter module is used to filter the smoke filtered by the first filter module;

[0010] A third filter module, the third filter module is located on one side of the second filter module, one end of the third filter module is connected to the second filter module, and the third filter module is used to filter the smoke filtered by the second filter module;

[0011] A circulation module, the circulation module is located on one side of the third filter module, one end of the circulation module is connected to the third filter module, and the circulation module is used to re-introduce the gas filtered by the third filter module into the 3D printing device;

[0012] The recoil module is arranged in the box body, the recoil module is fixedly connected to the fixed bracket, the recoil module is connected to the second filter module, and is used for recoil blanking of the second filter module.

[0013] The beneficial effect is that by setting the first, second and third filter modules, the gas in the device is filtered multiple times and restored to purity, and can continue to be passed into the circulating reflux printing device for use, the filtered metal dust is trapped in the above-mentioned filter module for collection, and the recoil module is set as a power source for the recoil blanking of the second filter module. The metal dust of the second filter module can be vibrated and dropped and gathered at the bottom of the second filter module under the action of the recoil module, thereby extending the service life of the second filter module. The second filter module can replace the filter element without stopping the machine, without interfering with the normal 3D printing process, and ultimately improves the production efficiency of 3D printing.

[0014] Preferably, the first filter module comprises an air inlet pipe,

[0015] A material dropping hopper, one end of which is connected with an air inlet pipe;

[0016] The dust removal kettle is located below the material dropping hopper and is connected to the lower end of the material dropping hopper;

[0017] The first main pipe has one end connected to the upper end of the material dropping hopper.

[0018] The beneficial effect is that the dust entering the air inlet pipe, among which the dust with heavier mass will fall into the dust removal kettle through the drop hopper and be collected, and the dust with lighter mass will be mixed with the gas and enter the first main pipe.

[0019] Preferably, the first filter module also includes a first auxiliary pipe group, one end of which is connected to the first main pipe, and the first auxiliary pipe group includes a first auxiliary pipe connected to the first main pipe, and a second auxiliary pipe connected to the first main pipe and located on one side of the first auxiliary pipe.

[0020] The beneficial effect is that the first auxiliary pipe group plays a diversion role, and the mixed gas will be diverted into the first auxiliary pipe and the second auxiliary pipe.

[0021] Preferably, the second filter module includes a first waste collection tank, a first air inlet pipe is provided at one end of the first waste collection tank, the first air inlet pipe is detachably connected to the first auxiliary pipe, a first filter element is provided in the first waste collection tank, and a first valve is provided at the part where the first air inlet pipe is connected to the tank body of the first waste collection tank, and the first valve is used to control the air intake of the first waste collection tank.

[0022] The beneficial effect is that the mixed gas enters the first filter element through the first air inlet pipe for filtration.

[0023] Preferably, the second filter module includes a second waste collection tank, a second air inlet pipe is provided at one end of the second waste collection tank, the second air inlet pipe is detachably connected to the second auxiliary pipe, a second filter element is provided in the second waste collection tank, and a second valve is provided at the part where the second air inlet pipe is connected to the tank body of the second waste collection tank, and the second valve is used to control the air intake of the second waste collection tank.

[0024] The beneficial effect is that the mixed gas enters the second filter element through the second air inlet pipe for filtration.

[0025] The first waste collection tank can be used together with the second waste collection tank as a backup, that is, when the first waste collection tank is in use, the second waste collection tank is used as a backup; or when the second waste collection tank is in use, the first waste collection tank is used as a backup, so as to ensure the uninterrupted progress of the 3D printing process and maximize the 3D printing efficiency.

[0026] Preferably, the recoil module comprises a recoil device, and the recoil device can be connected to the first waste collection tank and the second waste collection tank through a pipeline.

[0027] The beneficial effect is that the recoil device connects the first filter element and the second filter element, and the dust in the first filter element and the second filter element falls and is concentrated at the bottom of the filter element under the action of the recoil device, thereby extending the service life of the filter element.

[0028] Preferably, the third filter module includes a second auxiliary pipe group, and the second auxiliary pipe group is connected to the upper end of the second filter module;

[0029] A second main pipe, one end of which is connected to the second auxiliary pipe group;

[0030] a third waste collection tank, one end of which is connected to the second main pipe, and a third filter element is arranged in the third waste collection tank;

[0031] An air outlet pipe; one end of the air outlet pipe is connected to the third waste collection tank.

[0032] The beneficial effect is that the mixed gas filtered by the first and second filter modules enters the third filter element and is filtered again.

[0033] Preferably, the second auxiliary pipe group includes

[0034] a third auxiliary pipe, one end of which is connected to the upper end of the first waste collection tank, and the other end of which is connected to the second main pipe;

[0035] The fourth sub-pipe is located at one side of the third sub-pipe, one end of the fourth sub-pipe is connected to the upper end of the second waste collection tank, and the other end of the fourth sub-pipe is connected to the second main pipe.

[0036] The beneficial effect is that the second auxiliary pipe group plays a diversion role.

[0037] Preferably, the circulation module includes

[0038] A circulating air inlet pipe, one end of which can be connected to the other end of the air outlet pipe through a pipeline;

[0039] A fan, one end of which is connected to the other end of the circulating air inlet pipe;

[0040] A circulating air outlet duct, one end of which is connected to the fan.

[0041] The beneficial effect is that the fan passes the gas filtered by the third filter module through the circulating air outlet pipe and is then re-entered into the 3D printing device for use.

[0042] Preferably, the other end of the circulating air outlet duct is connected to a cooling device.

[0043] The beneficial effect is that the cooling device is used to reduce the gas temperature, and finally reduce the internal temperature of the entire 3D printing device.

[0044] According to another aspect of the present application, a metal additive manufacturing device using the above-mentioned uninterrupted filtering circulation device is provided. Its beneficial effect is that the metal additive manufacturing device using this uninterrupted filtering circulation device can restore the purity of the gas generated during the manufacturing process after multiple filtrations, so that it can continue to be passed into the manufacturing equipment for use, and the filtered metal dust is trapped in the above-mentioned filter module. The recoil module provided in addition is used as a power source for the recoil blanking of the second filter module. The metal dust of the second filter module can be vibrated and blanked under the action of the recoil module and gathered at the bottom of the second filter module, thereby extending the service life of the second filter module and thus extending the service life of the entire manufacturing equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0046] Figure 1 This is a schematic diagram of the structure of the first embodiment of the present application.

[0047] Figure 2 for Figure 1 Schematic diagram of the structure from another perspective.

[0048] Figure 3 for Figure 1 Schematic diagram of the structure from another perspective.

[0049] Figure 4 for Figure 1 Schematic diagram of the structure of the first filtering module.

[0050] Figure 5 This is a perspective view of the first waste collection tank structure.

[0051] Figure 6 This is a perspective view of the second waste collection tank structure.

[0052] Figure 7 for Figure 1 Schematic diagram of the structure of some components.

[0053] Figure 8 This is a perspective view of the third waste collection tank structure.

[0054] Fig. 9 It is a schematic diagram of the connection between the circulating air outlet duct and the cooling device.

[0055] Description of the reference numerals in the accompanying drawings:

[0056] 1. Box; 2. Fixed bracket; 3. First filter module; 4. Second filter module; 5. Third filter module; 6. Circulation module; 7. Backwash module; 31. Air inlet pipe; 32. Drop hopper; 33. Dust removal kettle; 34. First main pipe; 35. First auxiliary pipe group; 41. First waste collection tank; 42. Second waste collection tank; 51. Second auxiliary pipe group; 52. Second main pipe; 53. Third waste collection tank; 54. Air outlet pipe; 61. Circulation inlet Air duct; 62, fan; 63, circulating air outlet duct; 64, cooling device; 71, recoil device; 351, first auxiliary pipe; 352, second auxiliary pipe; 411, first air inlet pipe; 412, first filter element; 413, first valve; 414, first pulse valve; 421, second air inlet pipe; 422, second filter element; 423, second valve; 424, second pulse valve; 511, third auxiliary pipe; 512, fourth auxiliary pipe; 531, third filter element; DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are part of the embodiments of the present application, rather than all of the embodiments, and are only used to explain the present application, and are not used to limit the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0058] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "inside", "outside", "two ends", "both sides", "bottom", "top" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred elements must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limitations on the present application. In addition, the terms "first", "second", "superior", "inferior", "primary", "secondary" and the like are only used for descriptive purposes and can be simply used to more clearly distinguish different components, but cannot be understood as indicating or implying relative importance.

[0059] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0060] like Figures 1 to 8 As shown, in Example 1 of the present application:

[0061] --The uninterruptedly operating filtering circulation device comprises a box body 1, in which a fixed bracket 2 is arranged;

[0062] The first filter module 3 is located in the housing 1 and is used for preliminarily separating gas and solid matter in smoke;

[0063] A second filter module 4, which is located at one side of the first filter module 3, one end of which is connected to the first filter module 3, and is used to filter the smoke filtered by the first filter module 3;

[0064] A third filter module 5, the third filter module 5 is located on one side of the second filter module 4, one end of the third filter module 5 is connected to the second filter module 4, and the third filter module 5 is used to filter the smoke filtered by the second filter module 4;

[0065] A circulation module 6, which is located on one side of the third filter module 5, one end of which is connected to the third filter module 5, and is used to re-introduce the gas filtered by the third filter module 5 into the 3D printing device;

[0066] The recoil module 7 is arranged in the box body 1 , and the recoil module 7 is fixedly connected to the fixed bracket 2 . The recoil module 7 is connected to the second filter module 4 and is used for recoil blanking of the second filter module 4 .

[0067] --The first filter module 3 includes an air inlet pipe 31,

[0068] A material dropping hopper 32, one end of which is connected to an air inlet pipe 31;

[0069] The dust removal kettle 33 is located below the material drop hopper 32 and is connected to the lower end of the material drop hopper 32;

[0070] The first main pipe 34 has one end connected to the upper end of the hopper 32 .

[0071] The first filter module 3 adopts a gravity feeding method. The dust with larger mass in the smoke will pass through the feeding hopper 32 and fall into the dust removal kettle 33. The dust removal kettle 33 is detachably connected to the lower end of the feeding hopper 32. After the dust in the dust removal kettle 33 is fully collected, it can be disassembled and replaced.

[0072] The first filter module 3 also includes a first auxiliary pipe group 35, one end of which is connected to the first main pipe 34. The first auxiliary pipe group 35 includes a first auxiliary pipe 351 connected to the first main pipe 34, and a second auxiliary pipe 352 connected to the first main pipe 34 and located on one side of the first auxiliary pipe 351.

[0073] The second filter module 4 includes a first waste collection tank 41 , one end of which is provided with a first air inlet pipe 411 , which is detachably connected to the first auxiliary pipe 351 , and a first filter element 412 is provided in the first waste collection tank 41 .

[0074] The second filter module 4 includes a second waste collection tank 42 , one end of which is provided with a second air inlet pipe 421 , which is detachably connected to the second auxiliary pipe 352 , and a second filter element 422 is provided in the second waste collection tank 42 .

[0075] The recoil module 7 includes a recoil device 71, which can be connected to the first waste collection tank 41 and the second waste collection tank 42 through a pipeline. The recoil device 71 can be a recoil cylinder.

[0076] The recoil device 71 serves as an air source, which is connected to the first pulse valve 414 arranged on the upper end of the first filter element 412 and the second pulse valve 424 arranged on the upper end of the second filter element 422. The recoil device 71 drives the first pulse valve 414 and the second pulse valve 424 to vibrate to drive the first filter element 412 and the second filter element 422 to vibrate and drop materials.

[0077] --It should be noted that pressure sensors are provided in the first waste collection tank 41 and the second waste collection tank 42, and the collected dust will be unevenly collected in the first filter element 412 and the second filter element 422. The first filter element 412 and the second filter element 422 can be vibrated by the recoil device 71, so that the dust falls during the vibration and is concentrated at the bottom of the filter element, thereby extending the service life of the above-mentioned filter element. In addition, the first filter element 412 and the second filter element 422 are detachably connected to the first waste collection tank 41 and the second waste collection tank 42, respectively. After collecting full dust, the first filter element 412 and the second filter element 422 can be disassembled and replaced in time.

[0078] In addition, rollers are provided at the bottom of the first waste collection tank 41 and the second waste collection tank 42, so that the first waste collection tank 41 and the second waste collection tank 42 can be disassembled and replaced when necessary.

[0079] When the first waste collection tank 41 and the second waste collection tank 42 are used, one of the collection tanks can be used for filtering and the other can be used as a backup, so that when one of the collection tanks is full, the other collection tank can be filled in time, so that the entire 3D printing process can run uninterruptedly without stopping the device.

[0080] For example, the first valve 413 can be opened and the second valve 423 can be closed to allow the first waste collection tank 41 to filter and collect first. After the 3D printing process has been carried out for a period of time, especially when the first waste collection tank 41 is full, the second valve 423 can be opened and the first valve 413 can be closed to allow the second waste collection tank 42 to fill the position. At this time, the first filter element 412 in the first waste collection tank 41 is manually replaced. After the replacement is completed, wait until the second waste collection tank 42 is full and then repeat the above process.

[0081] In this embodiment, the first filter element 412 and the second filter element 422 may have a specification of F9.

[0082] --The third filter module 5 includes a second auxiliary pipe group 51, and the second auxiliary pipe group 51 is connected to the upper end of the second filter module 4;

[0083] A second main pipe 52, one end of which is connected to the second auxiliary pipe group 51;

[0084] A third waste collection tank 53, one end of which is connected to the second main pipe 52, and a third filter element 531 is disposed in the third waste collection tank 53;

[0085] An air outlet pipe 54 ; one end of the air outlet pipe 54 is connected to the third waste collection tank 53 .

[0086] The specification of the third filter element 531 in this embodiment is H13.

[0087] --The second auxiliary pipe group 51 includes

[0088] A third auxiliary pipe 511, one end of which is connected to the upper end of the first waste collection tank 41, and the other end of which is connected to the second main pipe 52;

[0089] The fourth sub-pipe 512 is located at one side of the third sub-pipe 511 , one end of the fourth sub-pipe 512 is connected to the upper end of the second waste collection tank 42 , and the other end of the fourth sub-pipe 512 is connected to the second main pipe 52 .

[0090] --Loop module 6 includes

[0091] A circulating air inlet pipe 61, one end of which can be connected to the other end of the air outlet pipe 54 through a pipeline;

[0092] A fan 62, one end of the fan 62 is connected to the other end of the circulating air inlet pipe 61;

[0093] The circulating air outlet pipe 63 has one end connected to the fan 62 .

[0094] --When the filtering circulation module 6 is running, the smoke and dust from the 3D printing equipment enters the hopper 32 through the air inlet pipe 31, among which the heavier powder falls into the dust removal kettle 33 for collection, and the remaining mixed gas is sucked into the first main pipe 34, and then after being diverted by the first sub-pipe 351 and the second sub-pipe 352, it passes through the first air inlet pipe 411 and the second air inlet pipe 421 respectively, and then enters the first filter element 412 of the first waste collection tank 41 and the second filter element 422 in the second waste collection tank 42 for filtration.

[0095] The accumulated dust in the first filter element 412 and the second filter element 422 is unevenly distributed in the above-mentioned filter elements, which greatly occupies the use area of ​​the above-mentioned filter elements. Therefore, a backflushing device 71 is used to make the dust in the first filter element 412 and the second filter element 422 fall under vibration, so that the fallen dust is collected at the bottom of the above-mentioned filter elements, thereby extending the use time of the filter elements as much as possible.

[0096] The filtered mixed gas enters the second main pipe 52 through the third sub-pipe 511 and the fourth sub-pipe 512, and then enters the third filter element 531 in the third waste collection tank 53 for filtration. The remaining powder in the mixed gas is collected in the third filter element 531.

[0097] The filtered gas enters the circulating air inlet pipe 61 under the suction of the fan 62, enters the circulating air outlet pipe 63 after being transferred by the fan 62, and is finally re-introduced into the 3D printing device.

[0098] Embodiment 2:

[0099] On the basis of the first embodiment, one end of the circulating air outlet pipe 63 is connected to any cooling device 64 with cooling function for cooling. In this embodiment, the cooling device 64 is cooled by water to finally reduce the temperature of the gas.

[0100] The above are only some embodiments of the present application, which are only used to illustrate the technical solution of the present application, rather than to limit it. It should be understood that, for those skilled in the art, without departing from the creative concept of the present application, it is possible to improve or replace it according to the above description, and all these improvements and replacements should belong to the protection scope of the claims attached to the present application. In this case, all details can be replaced by equivalent elements, and the materials, shapes and sizes can also be arbitrary.

Claims

1. A non-stop filtering circulation device, characterized in that: It comprises a box body (1), wherein a fixing bracket (2) is arranged inside the box body (1); A first filter module (3), the first filter module (3) is located in the housing (1) and is used for preliminarily separating gas and solid matter in smoke; A second filter module (4), the second filter module (4) being located on one side of the first filter module (3), one end of the second filter module (4) being connected to the first filter module (3), and the second filter module (4) being used to filter smoke dust filtered by the first filter module (3); a third filter module (5), the third filter module (5) being located on one side of the second filter module (4), one end of the third filter module (5) being connected to the second filter module (4), the third filter module (5) being used to filter smoke dust filtered by the second filter module (4); A circulation module (6), the circulation module (6) being located on one side of the third filter module (5), one end of the circulation module (6) being connected to the third filter module (5), and the circulation module (6) being used to reintroduce the gas filtered by the third filter module (5) into the 3D printing device; A recoil module (7), wherein the recoil module (7) is arranged in the housing (1), the recoil module (7) is fixedly connected to the fixed bracket (2), and the recoil module (7) is connected to the second filter module (4) and is used for recoil blanking of the second filter module (4).

2. The uninterrupted filtering circulation device according to claim 1, characterized in that: The first filter module (3) comprises an air inlet pipe (31), A material dropping hopper (32), one end of which is connected to an air inlet pipe (31); A dust removal kettle (33), the dust removal kettle (33) is located below the material drop hopper (32), and the dust removal kettle (33) is connected to the lower end of the material drop hopper (32); A first main pipe (34), one end of which is connected to the upper end of the material dropping hopper (32).

3. The uninterrupted filtering circulation device according to claim 2, characterized in that: The first filtering module (3) further comprises a first auxiliary pipe group (35), one end of the first auxiliary pipe group (35) being connected to the first main pipe (34), the first auxiliary pipe group (35) comprising a first auxiliary pipe (351) connected to the first main pipe (34), and a second auxiliary pipe (352) connected to the first main pipe (34) and located on one side of the first auxiliary pipe (351).

4. The uninterrupted filtering circulation device according to claim 1, characterized in that: The second filter module (4) comprises a first waste collection tank (41), one end of which is provided with a first air intake pipe (411), the first air intake pipe (411) being detachably connected to the first filter module (3), a first filter element (412) being provided in the first waste collection tank (41), a first valve (413) being provided at a portion where the first air intake pipe (411) is connected to the tank body of the first waste collection tank (41), the first valve (413) being used to control air intake of the first waste collection tank (41).

5. The uninterrupted filtering circulation device according to claim 1, characterized in that: The second filter module (4) comprises a second waste collection tank (42), one end of which is provided with a second air inlet pipe (421), the second air inlet pipe (421) being detachably connected to the first filter module (3), a second filter element (422) being provided in the second waste collection tank (42), a second valve (423) being provided at the portion where the second air inlet pipe (421) is connected to the tank body of the second waste collection tank (42), the second valve (423) being used to control the air intake of the second waste collection tank (42).

6. The uninterrupted filtering circulation device according to claim 4 or 5, characterized in that: The backflushing module (7) comprises a backflushing device (71), and the backflushing device (71) can be connected to the second filter module (4) through a pipeline.

7. The uninterrupted filtering circulation device according to claim 1, characterized in that: The third filter module (5) comprises a second auxiliary pipe group (51), and the second auxiliary pipe group (51) is connected to the upper end of the second filter module (4); A second main pipe (52), one end of the second main pipe (52) being connected to the second auxiliary pipe group (51); A third waste collection tank (53), one end of the third waste collection tank (53) being connected to the second main pipe (52), and a third filter element (531) being arranged in the third waste collection tank (53); An air outlet pipe (54); one end of the air outlet pipe (54) is connected to the third waste collection tank (53).

8. The uninterrupted filtering circulation device according to claim 7, characterized in that: The second auxiliary pipe group (51) comprises a third auxiliary pipe (511), one end of the third auxiliary pipe (511) being connected to the upper end of the first waste collection tank (41), and the other end of the third auxiliary pipe (511) being connected to the second main pipe (52); A fourth sub-pipe (512), the fourth sub-pipe (512) is located on one side of the third sub-pipe (511), one end of the fourth sub-pipe (512) is connected to the upper end of the second waste collection tank (42), and the other end of the fourth sub-pipe (512) is connected to the second main pipe (52).

9. The uninterrupted filtering circulation device according to claim 7, characterized in that: The circulation module (6) comprises A circulating air inlet pipe (61), one end of which can be connected to the other end of the air outlet pipe (54) through a pipeline; A fan (62), one end of the fan (62) being connected to the other end of the circulating air inlet pipe (61); A circulating air outlet pipe (63), one end of which is connected to the fan (62); And / or the other end of the circulating air outlet pipe (63) is connected to a cooling device (64).

10. A metal additive manufacturing device, characterized in that: An uninterrupted filtering circulation device according to any one of claims 1 to 9 is used.

Images