Pore channel powder cleaning device and method for 3D printing workpiece

Abstract

The invention discloses a pore channel powder cleaning device and method for a 3D printing workpiece, and relates to the technical field of 3D printing. By arranging the positive pressure unit and the positive pressure power source, a positive pressure environment is formed in the positive pressure pipe, as the sealing connecting piece is fixedly connected with a pore channel of a 3D printing workpiece, positive pressure is kept at the pore channel of the 3D printing workpiece, at the moment, the powder guide valve body is suddenly opened, and powder in the pore channel is influenced by sudden change of pressure and is sucked out by the powder guide pipe; the pipe feeding device can feed the powder guide pipe into a hole channel of a 3D printing workpiece, and the powder suction effect is enhanced. The structure can be suitable for powder cleaning treatment of various pore channel structures including blind holes, through holes and various complex pore channels, and equipment is easy to operate and good in powder cleaning effect. And the power requirement for the positive pressure power source is relatively small, the device can be suitable for various working conditions, meanwhile, large pressure changes can be generated with small power so as to adapt to the powder removing working condition of orifice powder caking, and the freedom degree of 3D printing application is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and in particular to a channel powder cleaning device and method for a 3D printed workpiece. Background Art

[0002] According to the different feeding methods, 3D printing technology can be divided into powder-laying type, powder-feeding type and wire-feeding type. Among them, powder-laying 3D printing technology mainly includes selective laser melting (SLM), selective laser sintering (SLS) and electron beam melting (EBM). These 3D printing technologies based on powder-laying usually use precision focused light spots or electron beams as heat sources to quickly melt the pre-laid layers of metal or nylon powder, and can almost directly obtain functional parts of any shape. The density of powder bed 3D printed parts based on laser as heat source can reach nearly 100%, which is a rapid prototyping technology with great development prospects, especially in the fields of aerospace, medical, automobile, mold, etc. It has extremely important application prospects.

[0003] However, many 3D printed parts often have complex channels (such as single inlet and single outlet, multiple inlets and multiple outlets, single inlet and multiple outlets, and more complex combinations), and even some blind holes with only inlet but no outlet. During the 3D printing process, the unmelted powder in the channel of the part is arranged tightly, and the channel structure is complex, usually in a three-dimensional spatial direction, which makes it difficult to remove the unmelted powder in the channel and easily remains inside the product to form excess.

[0004] The traditional hole cleaning method mainly uses high-pressure water or air flow to flush, combined with vacuum cleaner adsorption. High-pressure water or air flow is injected from a certain inlet, and the powder is discharged or sucked out from the outlet. However, the powder cleaning effect of this method is extremely limited. It is basically only suitable for simple hole cleaning with single inlet and single outlet or single inlet and multiple outlets, and cannot be applied to blind holes and other complex holes.

[0005] The existing method of cleaning powder for blind holes requires designing process holes in advance to form through-holes, and then sealing the process holes by repair welding or plugging after cleaning powder. This method has a complicated process, and the reliability of repair welding or plugging is poor, which is easy to cause leakage.

[0006] For channels with more complex structures, such as those that are too thin, too long, have many turns or have narrow nozzles, the powder remaining inside the channel will form a huge resistance, and the powder can only be discharged by the pressure of high-pressure airflow, which places extremely high requirements on the hardware of the powder cleaning facilities.

[0007] For other complex channels, such as single-inlet to multiple-inlet and then to single-outlet, once the powder in one branch of the channel is cleared, the powder in other branches inside can no longer be discharged by pressure, resulting in the scrapping of the parts. Usually, such channels can only be avoided at the design level. Therefore, the obstacle of powder cleaning also limits the freer application of 3D printing.

[0008] In addition, for metal 3D printing, parts need to be formed on a metal substrate and then removed by wire cutting. Since the wire cutting process requires the use of coolant, the powder at the orifices of these parts will be wetted and agglomerated during the wire cutting process, further increasing the difficulty of cleaning the powder in the orifices.

[0009] In view of this, the present invention is proposed. Summary of the invention

[0010] The object of the present invention is to provide a device and method for clearing powder from a pore of a 3D printed workpiece.

[0011] The present invention is achieved in that:

[0012] In a first aspect, the present invention provides a channel powder cleaning device for a 3D printed workpiece, comprising a positive pressure unit and a powder guiding unit.

[0013] The positive pressure unit includes a positive pressure power source, a positive pressure tube and a sealing connector. The positive pressure power source is connected to the positive pressure tube. The sealing connector is fixed to one end of the positive pressure tube away from the positive pressure power source. The sealing connector is configured to connect the positive pressure tube with a channel of a 3D printed workpiece.

[0014] The powder guide unit includes a pipe delivery device, a powder guide valve body and a powder guide tube. The powder guide tube is sleeved in the positive pressure tube and can be selectively moved in the positive pressure tube. One end of the powder guide tube close to the sealing connector is configured to be selectively in contact with the channel of the 3D printing workpiece, and the other end opposite is configured to be connected to the powder storage device; the powder guide valve body is installed on the powder guide tube and is configured to control the connection between the powder storage device and the channel of the 3D printing workpiece; the pipe delivery device transports the powder guide tube into the channel of the 3D printing workpiece.

[0015] In an optional embodiment, the positive-pressure power source is a positive-pressure gas source. Preferably, the positive-pressure gas source is configured to be connected to a gas delivery unit of the factory.

[0016] In an optional embodiment, the positive pressure gas source includes an air pump and an exhaust valve body, the air pump is connected to the positive pressure pipe, the exhaust valve body is arranged on the positive pressure pipe, and is configured to selectively connect the air pump with the channel of the 3D printing workpiece.

[0017] In an optional embodiment, the gas in the positive pressure gas source includes air or an inert gas; the inert gas includes argon or nitrogen; and the air output by the positive pressure gas source is compressed air.

[0018] In an optional embodiment, the positive pressure power source is a magnetically controlled switch, a magnetic component is provided at one end of the powder guide tube away from the tube delivery device, and the magnetically controlled switch controls the magnetism of the magnetic component.

[0019] In an optional embodiment, the sealing connector includes any one of a threaded sealing connector, a sealing ring or a clamp.

[0020] In an optional embodiment, the powder guide tube is a soft pipe, and the positive pressure tube is a hard pipe.

[0021] In an optional embodiment, the powder guide valve body is located on a side of the powder guide tube close to the powder storage device.

[0022] In an optional embodiment, the powder guide tube moves inside the positive pressure tube along the axial direction of the positive pressure tube.

[0023] In a second aspect, the present invention provides a method for cleaning powder from a channel of a 3D printed workpiece, which is applicable to a device as in any of the aforementioned embodiments, comprising fixedly connecting the channel of the 3D printed workpiece to a sealing connector, using a positive pressure power source to form a positive pressure in a positive pressure tube, and then using a tube delivery device to deliver a powder guide tube into the channel, and opening a powder guide valve body so that the powder in the channel of the 3D printed workpiece is sucked away by the powder guide tube.

[0024] In an optional implementation manner, the process of forming positive pressure and the process of opening the powder guide valve body to absorb powder are circulated 2 to 10 times.

[0025] The present invention has the following beneficial effects:

[0026] The present invention provides a device and method for cleaning powder in a channel of a 3D printed workpiece. By setting a positive pressure unit, a positive pressure power source forms a positive pressure environment in a positive pressure tube. Since the sealing connector is fixedly connected to the channel of the 3D printed workpiece, the channel of the 3D printed workpiece maintains positive pressure. At this time, the powder guide valve body is suddenly opened, and the powder in the channel is affected by the sudden change in pressure and sucked out by the powder guide tube. The tube delivery device can deliver the powder guide tube into the channel of the 3D printed workpiece to enhance the powder suction effect. The structure can be applied to various channel structures, including blind holes, through holes and various complex channels for powder cleaning, and the device is simple to operate and has a good powder cleaning effect. The power requirement for the positive pressure power source is relatively small, and it can be applied to a variety of working conditions. At the same time, a larger pressure change can be generated with a smaller power to adapt to the powder cleaning working condition of orifice powder agglomeration, thereby improving the degree of freedom of 3D printing applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 A schematic structural diagram of a channel powder cleaning device for a 3D printed workpiece provided in the first embodiment of the present invention;

[0029] Figure 2 A schematic structural diagram of a channel powder cleaning device for a 3D printed workpiece provided in accordance with a second embodiment of the present invention.

[0030] Explanation of the main component symbols: 100-channel powder cleaning device for 3D printed workpiece; 111-positive pressure air source; 1111-air pump; 1112-exhaust valve body; 112-positive pressure pipe; 113-sealing connector; 121-pipe delivery device; 122-powder guide valve body; 123-powder guide pipe. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be described clearly and completely below. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be purchased commercially.

[0032] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0033] First embodiment

[0034] like Figure 1 As shown, this embodiment provides a channel powder cleaning device 100 for a 3D printed workpiece, including a positive pressure unit and a powder guiding unit.

[0035] In this embodiment, the positive pressure unit and the powder guiding unit are arranged at the same opening of the same channel of the 3D printing workpiece.

[0036] The positive pressure unit includes a positive pressure gas source 111, a positive pressure tube 112 and a sealing connector 113. The positive pressure gas source 111 is connected to the positive pressure tube 112. One end of the positive pressure tube 112 away from the positive pressure gas source 111 is connected to the sealing connector 113. The sealing connector 113 is configured to connect the positive pressure tube 112 and the channel of the 3D printed workpiece.

[0037] The powder guide unit includes a pipe delivery device 121, a powder guide valve body 122 and a powder guide tube 123. The powder guide tube 123 is sleeved in the positive pressure tube 112 and can be selectively moved in the positive pressure tube 112. One end of the powder guide tube 123 close to the sealing connector 113 is configured to be selectively in contact with the channel of the 3D printing workpiece, and the other end opposite is configured to be connected to the powder storage device; the powder guide valve body 122 is installed on the powder guide tube 123 and is configured to control the connection between the powder storage device and the channel of the 3D printing workpiece; the pipe delivery device 121 transports the powder guide tube 123 into the channel of the 3D printing workpiece.

[0038] The function of the sealing connector 113 is to seal the pore cleaning device 100 of the 3D printed workpiece with the pore of the 3D printed workpiece without obvious air leakage, so as to ensure a positive pressure environment at the pore. Therefore, the sealing connector 113 includes any one of a threaded sealing connector 113, a sealing ring or a clamp.

[0039] The specific selection of the sealing connector 113 can be selected according to the channel structure of the 3D printed workpiece. When the orifice of the channel of the 3D printed workpiece is a threaded structure, the sealing connector 113 can be a threaded sealing connector 113; when the orifice of the channel of the 3D printed workpiece is a smooth annular opening, a sealing ring or a clamp can be selected as the sealing connector 113 to fix the channel powder cleaning device 100 of the 3D printed workpiece and the channel of the 3D printed workpiece.

[0040] It can be understood that in the present embodiment, the positive pressure power source is a positive pressure gas source 111, which forms a positive pressure environment by blowing gas into the powder guide tube 123. The power requirement for the positive pressure gas is relatively small, and it can be applied to a variety of working conditions. At the same time, a larger pressure change can be generated with a smaller gas pressure requirement to adapt to the powder cleaning condition of orifice powder agglomeration, thereby improving the degree of freedom of 3D printing applications.

[0041] In other embodiments, when the powder in the channel of the 3D printed workpiece is magnetic powder, the positive pressure power source can also be a magnetically controlled switch. A magnetic component is provided at one end of the powder guide tube 123 away from the pipe delivery device 121. The magnetically controlled switch controls the magnetism of the magnetic component to form a positive magnetic force on the powder in the channel of the 3D printed workpiece, thereby sucking away the magnetic powder in the channel of the 3D printed workpiece.

[0042] In this embodiment, the sealing connection member 113 is a sealing ring.

[0043] In this embodiment, the positive pressure gas source 111 is configured to be connected to the gas delivery unit of the factory. The gas in the gas delivery unit can be introduced into the positive pressure gas source 111 for powder cleaning, and the factory gas pressure can be ensured to be ≥3 bar.

[0044] The traditional powder cleaning method mainly uses the impact force of gas or water flow to blow the powder out from the other side of the channel. Therefore, when the channel structure is more complicated, it is necessary to increase the factory air pressure to achieve a good powder cleaning effect. The general factory air pressure can only reach 6 to 10 bar. Too high factory air pressure will cause higher factory risk factors and higher maintenance costs. Therefore, the traditional powder cleaning method will seriously limit the application of 3D printing.

[0045] The 3D printed workpiece channel powder cleaning device 100 provided in this embodiment can use a relatively low factory air pressure to generate a positive pressure environment on one side of the channel, has a relatively low gas pressure requirement, and can be applied to a wider range of working conditions.

[0046] The gas in the positive pressure gas source 111 includes air or inert gas; in order to prevent the powder from reacting during the powder cleaning process, the inert gas includes argon or nitrogen; in order to ensure that the positive pressure environment is quickly formed, the air output by the positive pressure gas source 111 is compressed air.

[0047] In this embodiment, the gas in the positive pressure gas source 111 is compressed air.

[0048] In this embodiment, the function of the powder guide tube 123 is to extend into the channel and contact the powder in the channel to facilitate the extraction of the powder in the channel. Therefore, the outer diameter of the powder guide tube 123 should match the inner diameter of the channel so that the powder guide tube 123 can extend into the channel.

[0049] In addition, since the shapes of the holes of different workpieces are different, in order to facilitate the powder guide tube 123 to perform the powder extraction function, the powder guide tube 123 is a soft pipe, for example, it can be made of PVC material.

[0050] In this embodiment, since the positive pressure pipe 112 is a pipe used to transport gas and form a positive pressure environment at the channel, in order to ensure the positive pressure environment and equipment stability, the positive pressure pipe 112 is a hard pipe, for example, a metal pipe or a hard plastic pipe.

[0051] The powder guide valve body 122 can control the pressure change near the hole. When the powder guide valve body 122 is opened, the positive pressure environment near the hole is destroyed, and the powder in the hole is sucked out by the pressure. Therefore, the greater the pressure change, the easier it is to suck out the powder. In order to ensure a large pressure change, in this embodiment, the powder guide valve body 122 is located on the side of the powder guide tube 123 close to the powder storage device, so the positive pressure environment range near the hole is larger, and when the powder guide valve body 122 is opened, the powder is easier to be sucked out.

[0052] In this embodiment, since the powder guide tube 123 needs to extend into the interior of the channel, the powder guide tube 123 moves in the positive pressure tube 112 along the axial direction of the positive pressure tube 112. The end of the powder guide tube 123 that enters the channel is made of a softer material and can adapt to the shape of the channel, making it easier to extend into the channel to clean the powder.

[0053] In this embodiment, the function of the tube delivery device 121 is to squeeze the powder guide tube 123 into or out of the channel. The tube delivery device 121 can adopt a conventional conveying structure, such as using upper and lower conveying rollers to drive the powder guide tube 123 to move, or using a clamp with movable ability to drive the powder guide tube 123 to move, as long as the displacement of the powder guide tube 123 can be achieved.

[0054] This embodiment also provides a method for cleaning powder from the channels of a 3D printed workpiece, which is applicable to the above-mentioned device 100 for cleaning powder from the channels of a 3D printed workpiece, and includes the following steps:

[0055] S01, seal the other holes of the 3D printing workpiece except the powder cleaning hole, so that the powder cleaning hole forms a blind hole. If the powder cleaning hole is a blind hole, this step can be omitted.

[0056] S02. Connect the powder cleaning hole to the positive pressure pipe 112 through the sealing connector 113, and close the powder guide valve body 122.

[0057] S03, turning on the positive pressure gas source 111, so that the positive pressure pipe 112, the powder guide pipe 123 (the area between the powder guide valve body 122 and the powder cleaning hole) and the powder cleaning hole are in a positive pressure state.

[0058] S04. Push the powder guide tube 123 into the powder cleaning hole by using the tube delivery device 121 until one end of the powder guide tube 123 contacts the powder in the powder cleaning hole and cannot be pushed.

[0059] S05, after maintaining the pressure for a certain period of time, the powder guide valve body 122 is opened rapidly to break the pressure. Due to the sudden drop in air pressure, the powder in the powder cleaning hole can rebound, and part of the powder in the powder cleaning hole enters the powder guide tube 123 under the pressure drop and is discharged into the powder storage device.

[0060] S06. Repeat steps S03 to S05. Each time the steps are repeated, the length of the powder guide tube 123 extending into the powder cleaning hole increases until the powder guide tube 123 discharges all the powder in the powder cleaning hole out of the hole.

[0061] Second embodiment

[0062] like Figure 2 As shown, this embodiment provides a channel powder cleaning device 100 for a 3D printed workpiece, including a positive pressure unit and a powder guiding unit.

[0063] In this embodiment, the positive pressure unit and the powder guiding unit are arranged at the same opening of the same channel of the 3D printing workpiece.

[0064] The positive pressure unit includes a positive pressure gas source 111, a positive pressure tube 112 and a sealing connector 113. The positive pressure gas source 111 is connected to the positive pressure tube 112. One end of the positive pressure tube 112 away from the positive pressure gas source 111 is connected to the sealing connector 113. The sealing connector 113 is configured to connect the positive pressure tube 112 and the channel of the 3D printed workpiece.

[0065] The powder guide unit includes a pipe delivery device 121, a powder guide valve body 122 and a powder guide tube 123. The powder guide tube 123 is sleeved in the positive pressure tube 112 and can be selectively moved in the positive pressure tube 112. One end of the powder guide tube 123 close to the sealing connector 113 is configured to be selectively in contact with the channel of the 3D printing workpiece, and the other end opposite is configured to be connected to the powder storage device; the powder guide valve body 122 is installed on the powder guide tube 123 and is configured to control the connection between the powder storage device and the channel of the 3D printing workpiece; the pipe delivery device 121 transports the powder guide tube 123 into the channel of the 3D printing workpiece.

[0066] The function of the sealing connector 113 is to seal the pore cleaning device 100 of the 3D printed workpiece with the pore of the 3D printed workpiece without obvious air leakage, so as to ensure a positive pressure environment at the pore. Therefore, the sealing connector 113 includes any one of a threaded sealing connector 113, a sealing ring or a clamp.

[0067] The specific selection of the sealing connector 113 can be selected according to the channel structure of the 3D printed workpiece. When the orifice of the channel of the 3D printed workpiece is a threaded structure, the sealing connector 113 can be a threaded sealing connector 113; when the orifice of the channel of the 3D printed workpiece is a smooth annular opening, a sealing ring or a clamp can be selected as the sealing connector 113 to fix the channel powder cleaning device 100 of the 3D printed workpiece and the channel of the 3D printed workpiece.

[0068] In this embodiment, the sealing connection member 113 is a sealing ring.

[0069] In this embodiment, the positive pressure gas source 111 includes an air pump 1111 and an exhaust valve body 1112. The air pump 1111 is connected to the positive pressure pipe 112. The exhaust valve body 1112 is arranged on the positive pressure pipe 112 and is configured to selectively connect the air pump 1111 with the channel of the 3D printed workpiece.

[0070] The design of the air pump 1111 can pressurize the gas, so in this embodiment, the gas discharged from the positive pressure gas source 111 is compressed air. By setting the exhaust valve body 1112, the release of the gas can be controlled to form a positive pressure at the hole.

[0071] In this embodiment, the function of the powder guide tube 123 is to extend into the channel and contact the powder in the channel to facilitate the extraction of the powder in the channel. Therefore, the outer diameter of the powder guide tube 123 should match the inner diameter of the channel so that the powder guide tube 123 can extend into the channel.

[0072] In addition, since the shapes of the holes of different workpieces are different, in order to facilitate the powder guide tube 123 to perform the powder extraction function, the powder guide tube 123 is a soft pipe, for example, it can be made of PVC material.

[0073] In this embodiment, since the positive pressure pipe 112 is a pipe used to transport gas and form a positive pressure environment at the channel, in order to ensure the positive pressure environment and equipment stability, the positive pressure pipe 112 is a hard pipe, for example, a metal pipe or a hard plastic pipe.

[0074] The powder guide valve body 122 can control the pressure change near the hole. When the powder guide valve body 122 is opened, the positive pressure environment near the hole is destroyed, and the powder in the hole is sucked out by the pressure. Therefore, the greater the pressure change, the easier it is to suck out the powder. In order to ensure a large pressure change, in this embodiment, the powder guide valve body 122 is located on the side of the powder guide tube 123 close to the powder storage device, so the positive pressure environment range near the hole is larger, and when the powder guide valve body 122 is opened, the powder is easier to be sucked out.

[0075] In this embodiment, since the powder guide tube 123 needs to extend into the interior of the channel, the powder guide tube 123 moves in the positive pressure tube 112 along the axial direction of the positive pressure tube 112. The end of the powder guide tube 123 that enters the channel is made of a softer material and can adapt to the shape of the channel, making it easier to extend into the channel to clean the powder.

[0076] In this embodiment, the function of the tube delivery device 121 is to squeeze the powder guide tube 123 into or out of the channel. The tube delivery device 121 can adopt a conventional conveying structure, such as using upper and lower conveying rollers to drive the powder guide tube 123 to move, or using a clamp with movable ability to drive the powder guide tube 123 to move, as long as the displacement of the powder guide tube 123 can be achieved.

[0077] This embodiment also provides a method for cleaning powder from the channels of a 3D printed workpiece, which is applicable to the above-mentioned device 100 for cleaning powder from the channels of a 3D printed workpiece, and includes the following steps:

[0078] S01, seal the other holes of the 3D printing workpiece except the powder cleaning hole, so that the powder cleaning hole forms a blind hole. If the powder cleaning hole is a blind hole, this step can be omitted.

[0079] S02. Connect the powder cleaning hole to the positive pressure pipe 112 through the sealing connector 113, and close the powder guide valve body 122.

[0080] S03, opening the exhaust valve body 1112, and using the air pump 1111 to inflate the positive pressure pipe 112, the powder guide pipe 123 (the area between the powder guide valve body 122 and the powder cleaning hole), and the area of ​​the powder cleaning hole, so as to put them in a positive pressure state.

[0081] S04. Push the powder guide tube 123 into the powder cleaning hole by using the tube delivery device 121 until one end of the powder guide tube 123 contacts the powder in the powder cleaning hole and cannot be pushed.

[0082] S05, after maintaining the pressure for a certain period of time, the powder guide valve body 122 is opened rapidly to break the pressure. Due to the sudden drop in air pressure, the powder in the powder cleaning hole can rebound, and part of the powder in the powder cleaning hole enters the powder guide tube 123 under the pressure drop and is discharged into the powder storage device.

[0083] S06. Repeat steps S03 to S05. Each time the steps are repeated, the length of the powder guide tube 123 extending into the powder cleaning hole increases until the powder guide tube 123 discharges all the powder in the powder cleaning hole out of the hole.

[0084] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A channel powder cleaning device for 3D printed workpieces, characterized in that: It includes a positive pressure unit and a powder guiding unit; The positive pressure unit comprises a positive pressure power source, a positive pressure pipe and a sealing connector, wherein the positive pressure power source is connected to the positive pressure pipe, the sealing connector is fixed to an end of the positive pressure pipe away from the positive pressure power source, and the sealing connector is configured to connect the positive pressure pipe with a channel of a 3D printed workpiece; The powder guide unit includes a pipe delivery device, a powder guide valve body and a powder guide tube. The powder guide tube is sleeved in the positive pressure tube and can be selectively moved in the positive pressure tube. One end of the powder guide tube close to the sealing connector is configured to be selectively in contact with the channel of the 3D printing workpiece, and the other opposite end is configured to be connected to the powder storage device; the powder guide valve body is installed on the powder guide tube and is configured to control the communication between the powder storage device and the channel of the 3D printing workpiece; the pipe delivery device transports the powder guide tube into the channel of the 3D printing workpiece.

2. The device according to claim 1, characterized in that The positive-pressure power source is a positive-pressure gas source. Preferably, the positive-pressure gas source is configured to be connected to a gas delivery unit of a factory.

3. The device according to claim 2, characterized in that The positive pressure gas source includes an air pump and an exhaust valve body, the air pump is connected to the positive pressure pipe, the exhaust valve body is arranged on the positive pressure pipe, and is configured to selectively connect the air pump with the channel of the 3D printing workpiece.

4. The device according to claim 2, characterized in that The gas in the positive pressure gas source includes air or an inert gas; the inert gas includes argon or nitrogen; the air output by the positive pressure gas source is compressed air.

5. The device according to claim 1, characterized in that The positive pressure power source is a magnetically controlled switch, and a magnetic component is arranged at one end of the powder guide tube away from the tube delivery device, and the magnetically controlled switch controls the magnetism of the magnetic component.

6. The device according to claim 1, characterized in that The sealing connector includes any one of a threaded sealing connector, a sealing ring or a clamp.

7. The device according to claim 1, characterized in that The powder guide tube is a soft pipe, and the positive pressure tube is a hard pipe.

8. The device according to claim 1, characterized in that The powder guide valve body is located on a side of the powder guide tube close to the powder storage device.

9. The device according to claim 1, characterized in that The powder guide tube moves in the positive pressure tube along the axial direction of the positive pressure tube.

10. A method for cleaning powder from the pores of a 3D printed workpiece, characterized in that: The device is suitable for any one of claims 1 to 9, comprising fixedly connecting the channel of the 3D printed workpiece with the sealing connector, using the positive pressure power source to form a positive pressure in the positive pressure tube, and then using the tube delivery device to deliver the powder guide tube into the channel, opening the powder guide valve body, so that the powder in the channel of the 3D printed workpiece is sucked away by the powder guide tube.

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