A protective mirror purge system for a laser powder fusion additive device

Abstract

The application discloses a kind of protective mirror purge systems for laser powder melting additive equipment, belong to additive manufacturing technical field, the protective mirror includes the fixed plate installed in the top plate for carrying the galvanometer device in the equipment and several protective lenses embedded on the fixed plate, the purge system includes the purge device for carrying out purge to protective lens and control device, the purge device includes the flow guide mechanism arranged on the fixed plate and the gas supply assembly arranged above the fixed plate, and the gas supply assembly is used to transport protective gas to the flow guide mechanism, the protective gas sent into the flow guide bin is made to be fully blown to the lower surface of the corresponding protective lens below the working galvanometer unit after being deflected by the deflection mechanism, dust on the lower surface of the protective lens is blown away, so that the protective lens is clear, guarantee the light transmittance of protective lens, guarantee laser melting precision.

Description

Technical Field

[0001] This invention relates to the field of additive manufacturing technology, specifically to a protective mirror blowing system for laser powder melting additive manufacturing equipment. Background Technology

[0002] Laser powder melting additive manufacturing technology is an advanced manufacturing technology that selectively melts metal powder layer by layer with a high-energy laser beam, and then stacks the powder after cooling and solidification to form metal parts. It has advantages such as high forming accuracy, ability to manufacture complex structural parts, and high material utilization.

[0003] In laser powder melting additive manufacturing, the oxygen content in the printing chamber is reduced by an airflow system. After the oxygen content is reduced, the doctor blade begins to spread powder. After the powder is spread, the laser melts the powder to perform additive manufacturing. Traditional airflow systems have protective gas lines, dust removal circulating air inlet lines, and dust removal circulating air outlet lines on the printing box. The protective gas line and the dust removal circulating air inlet line are located on the same side, with the protective gas line above the dust removal circulating air inlet line. The dust removal circulating air outlet line is located on the other side. The protective gas line is used to supply protective gas, and the dust removal circulating air line is used to circulate the gas and remove dust-laden gas. However, in existing technologies, only a protective mirror protects the field mirror. During the additive manufacturing process, powder and dust still adhere to the lower surface of the protective mirror, causing reduced light transmission, poor light spot quality, and affecting the laser melting accuracy. Frequent cleaning and replacement of the protective mirror are required. Therefore, it is necessary to design a protective mirror cleaning system for laser powder melting additive manufacturing equipment. Summary of the Invention

[0004] The purpose of this invention is to provide a protective mirror purging system for laser powder melting additive manufacturing equipment, so as to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a protective mirror purging system for a laser powder melting additive manufacturing equipment, wherein the protective mirror includes a fixed plate mounted on a top plate for supporting a galvanometer device in the equipment and a plurality of protective lenses embedded in the fixed plate; the purging system includes a purging device for purging the protective lenses and a control device; the purging device includes a flow guiding mechanism disposed on the fixed plate and a gas supply assembly disposed above the fixed plate; the gas supply assembly is used to supply protective gas to the flow guiding mechanism; and the control device is electrically connected to the gas supply assembly.

[0006] The flow guiding mechanism includes a plurality of flow guiding channels on the fixed plate that correspond one-to-one with the protective lens. One end of the flow guiding channel is connected to the air supply component, and the other end of the flow guiding channel is connected to the flow guiding chamber. The outlet of the flow guiding chamber faces the adjacent protective lens. The flow guiding chamber is provided with a deflection mechanism for fully blowing the protective gas discharged from the outlet of the flow guiding chamber onto the lower surface of the protective lens.

[0007] The gas supply assembly includes a gas supply cylinder located above the fixed plate, and the gas supply cylinder is equipped with a plurality of gas guide pipes that correspond one-to-one with the guide channel.

[0008] The control device includes a number of control valves installed on the air duct, and the control valves are electrically connected one-to-one with a number of galvanometer devices located above the protective lens;

[0009] When a set of galvanometer devices is working, the control valve electrically connected to the set of galvanometer devices opens, and the protective gas in the gas supply cylinder is delivered to the guide channel through the corresponding gas guide pipe and discharged from the outlet of the guide chamber, blowing towards the lower surface of the protective lens corresponding to the set of galvanometer devices, blowing away the adhering substances on the lower surface of the protective lens.

[0010] In a further embodiment, the gas supply cylinder is installed on the top of the top plate, and the gas supply cylinder is located on one side of the multiple sets of galvanometer devices. The gas supply cylinder has a gas supply section at the outlet end corresponding to the number of sets of galvanometer devices. A number of the guide channels on a set of galvanometer devices are connected to one of the gas supply sections, and the control valve is located on the gas supply section.

[0011] In a further embodiment, the galvanometer device includes a galvanometer body and a collimating lens disposed outside the galvanometer body. The device includes a laser printing box, a top plate disposed on top of the laser printing box, the galvanometer body disposed above the top plate, the galvanometer body including a plurality of galvanometer units, and field lenses corresponding to each galvanometer unit disposed below the galvanometer unit. The protective lens is located below the field lens.

[0012] In a further embodiment, the deflection mechanism includes a connecting hole formed on the flow guide chamber and communicating with the air outlet of the flow guide channel. A first flow guide plate group is provided in the flow guide chamber on one side of the connecting hole, and a second flow guide plate group is provided in the flow guide chamber on one side of the first flow guide plate group.

[0013] In a further embodiment, the flow guide chamber has a V-shaped structure with its opening facing the protective lens, and the side of the flow guide chamber adjacent to the protective lens has an arc shape that matches the outer edge of the protective lens. The first flow guide plate group is arranged in the upper flow channel of the flow guide chamber, and the second flow guide plate group is arranged in the lower flow channel of the flow guide chamber.

[0014] In a further embodiment, a fan-shaped air guide hood is provided inside the air guide chamber on one side of the connecting hole, and the exhaust direction of the fan-shaped air guide hood is towards the first air guide plate group and the second air guide plate group.

[0015] In a further embodiment, the first guide plate group includes a plurality of central guide plates disposed in the middle of the interior of the guide chamber and a plurality of side guide plates disposed at the inner edge of the guide chamber and located outside the central guide plates. Both the central guide plates and the side guide plates are wedge-shaped structures. The wedge-shaped tips of the plurality of central guide plates face the fan-shaped guide shroud and are arranged at equal angles around the center of the fan-shaped guide shroud. The wedge-shaped tips of the plurality of side guide plates face the adjacent inclined surface of the V-shaped structure.

[0016] In a further embodiment, the second guide plate group includes a plurality of square guide plates disposed on the arc-shaped surface adjacent to the guide chamber and the protective lens, the square guide plates being arranged alternately with the middle guide plate.

[0017] In a further embodiment, the air inlet end of the guide channel is provided with a connecting part, and one end of the air guide pipe is inserted into the connecting part.

[0018] In a further embodiment, a galvanometer fixing plate is provided above the top plate, and the galvanometer body is fixed on the galvanometer fixing plate.

[0019] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: by opening the control valves that are electrically connected to the galvanometer units one by one, the protective gas in the gas supply cylinder is transported to the guide channel through the gas guide pipe. The protective gas transported to the guide channel is introduced into the guide chamber through the connecting hole. The protective gas entering the guide chamber through the connecting hole is diffused in a fan shape by the fan-shaped guide hood. The protective gas discharged from the fan-shaped guide hood is diverted by the middle guide plate. With the cooperation of the side guide plates, the protective gas in the upper channel is deflected. The protective gas in the lower channel is fully deflected by the square guide plates arranged alternately with the middle guide plate. The deflected protective gas is discharged from the air outlet of the guide chamber and blown towards the lower surface of the protective lens corresponding to the working galvanometer unit. This blows away the adhering substances on the lower surface of the protective lens, making the protective lens clear, ensuring the light transmittance of the protective lens, ensuring the laser melting accuracy, and eliminating the need for frequent cleaning and replacement of the protective lens. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the installation structure of the gas supply mechanism of the present invention;

[0021] Figure 2 This is a schematic diagram of the field lens mounting structure of the present invention;

[0022] Figure 3This is a schematic diagram of the protective mirror mounting structure of the present invention;

[0023] Figure 4 This is a schematic diagram of the flow channel structure of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of the flow guide chamber and the field lens of the present invention;

[0025] Figure 6 This is a schematic diagram of the flow guide chamber structure of the present invention;

[0026] Figure 7 This is a schematic diagram of the overall structure of the present invention;

[0027] Figure 8 This is a schematic diagram of the galvanometer body mounting structure of the present invention;

[0028] The attached figures are labeled as follows: top plate 1, galvanometer body 2, galvanometer fixing plate 3, collimating mirror 4, field mirror 5, fixing plate 6, gas supply cylinder 7, gas guide pipe 8, control valve 9, connecting part 10, guide channel 11, guide chamber 12, connecting hole 13, fan-shaped guide hood 14, first guide plate group 15, and second guide plate group 16. Detailed Implementation

[0029] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid obscuring the invention.

[0030] Please see Figures 1-8 The present invention provides a technical solution: a protective mirror purging system for a laser powder melting additive manufacturing equipment. The protective mirror includes a fixed plate 6 installed on a top plate 1 for supporting a galvanometer device in the equipment and a plurality of protective lenses embedded in the fixed plate 6. The purging system includes a purging device and a control device for purging the protective lenses. The purging device includes a flow guiding mechanism on the fixed plate 6 and an air supply component above the fixed plate 6. The air supply component is used to supply protective gas to the flow guiding mechanism. The control device is electrically connected to the air supply component.

[0031] The flow guiding mechanism includes several flow guiding channels 11 on the fixed plate 6, each corresponding to a protective lens. One end of the flow guiding channel 11 is connected to the air supply component, and the other end of the flow guiding channel 11 is connected to the flow guiding chamber 12. The outlet of the flow guiding chamber 12 faces the adjacent protective lens. The flow guiding chamber 12 is provided with a deflection mechanism for fully blowing the protective gas discharged from the outlet of the flow guiding chamber 12 onto the lower surface of the protective lens.

[0032] The gas supply assembly includes a gas cylinder 7 located above the fixed plate 6, and a number of gas pipes 8 connected to the guide channel 11 are installed on the gas cylinder 7.

[0033] The control device includes several control valves 9 installed on the air duct 8. The control valves 9 are electrically connected to multiple sets of galvanometer devices located above the protective lens. There are four sets of galvanometer devices, which can work separately or simultaneously.

[0034] When a set of galvanometer devices is working, the control valve 9, which is electrically connected to the set of galvanometer devices, opens, and the protective gas in the gas supply cylinder 7 is delivered to the guide channel 11 through the corresponding gas guide pipe 8 and discharged from the outlet of the guide chamber 12. The gas is blown towards the lower surface of the protective lens corresponding to the set of galvanometer devices, blowing away the adhering substances on the lower surface of the protective lens. A controller is provided on the outside of the gas supply cylinder 7. The controller is electrically connected to both the galvanometer unit and the control valve 9. When the galvanometer unit is working, the controller receives and processes the signal, and then transmits the signal to the control valve 9, which is electrically connected to the galvanometer unit, to open the control valve 9 and cooperate with the gas supply cylinder 7 to deliver the protective gas.

[0035] In a further embodiment, the gas supply cylinder 7 is installed on the top of the top plate 1. The gas supply cylinder 7 is located on one side of the multiple sets of galvanometer devices. The gas supply cylinder 7 has a gas supply section at the gas outlet corresponding to the number of galvanometer devices. Several guide channels 11 on a set of galvanometer devices are connected to one of the gas supply sections by corresponding gas pipes 8. The control valve 9 is located on the gas supply section.

[0036] Through the above technical solution, the control valve 9 works to deliver the protective gas in the gas supply cylinder 7 to the gas supply section and guide it to the gas guide pipe 8, and deliver the protective gas to the guide channel 11. By installing the gas supply cylinder 7 on the top of the top plate 1 on one side of the multiple galvanometer devices, the distance of protective gas delivery is reduced, which facilitates the rapid cleaning operation of the protective lens.

[0037] In a further embodiment, the galvanometer device includes a galvanometer body 2 and a collimating lens 4 disposed outside the galvanometer body 2. The device includes a laser printing box, a top plate 1 disposed on the top of the laser printing box, the galvanometer body 2 disposed above the top plate 1, the galvanometer body 2 includes a plurality of galvanometer units, and field lenses 5 corresponding to each galvanometer unit are disposed below the galvanometer units, and protective lenses are located below the field lenses 5.

[0038] Through the above technical solution, the laser is converted into parallel light by the collimating mirror 4. The parallel light comes out from the collimating mirror 4, hits the center of the galvanometer unit, and then hits the center of the field mirror 5.

[0039] In a further embodiment, the deflection mechanism includes a connecting hole 13 formed on the flow guide chamber 12 and connected to the air outlet of the flow guide channel 11. A first flow guide plate group 15 is provided in the flow guide chamber 12 on one side of the connecting hole 13, and a second flow guide plate group 16 is provided in the flow guide chamber 12 on one side of the first flow guide plate group 15.

[0040] Through the above technical solution, the protective gas delivered to the guide channel 11 is introduced into the guide chamber 12 through the connecting hole 13, and the protective gas is deflected by the first guide plate group 15 and the second guide plate group 16.

[0041] In a further embodiment, the flow guide chamber 12 has a V-shaped structure with its opening facing the protective lens. The side of the flow guide chamber 12 adjacent to the protective lens has an arc shape that matches the outer edge of the protective lens. The first flow guide plate group 15 is arranged in the upper flow channel of the flow guide chamber 12, and the second flow guide plate group 16 is arranged in the lower flow channel of the flow guide chamber 12.

[0042] Through the above technical solution, the guide chamber 12 is configured with a V-shaped structure, and an arc shape is provided on the side of the guide chamber 12 adjacent to the protective lens to match the outer edge of the protective lens. In conjunction with the first guide plate group 15 and the second guide plate group 16, the protective gas discharged from the guide chamber 12 is fully blown toward the lower surface of the protective lens.

[0043] In a further embodiment, a fan-shaped air guide shroud 14 is provided inside the air guide chamber 12 on one side of the connecting hole 13, and the exhaust direction of the fan-shaped air guide shroud 14 is towards the first air guide plate group 15 and the second air guide plate group 16.

[0044] Through the above technical solution, the protective gas entering the flow chamber 12 through the connecting hole 13 is diffused in a fan shape by the fan-shaped flow guide shroud 14, which facilitates the subsequent thorough blowing of the lower surface of the protective lens.

[0045] In a further embodiment, the first guide plate group 15 includes a plurality of central guide plates disposed in the middle of the interior of the guide chamber 12 and a plurality of side guide plates disposed at the inner edge of the guide chamber 12 and located outside the central guide plates. Both the central guide plates and the side guide plates are wedge-shaped structures. The wedge-shaped tips of the plurality of central guide plates face the fan-shaped guide shroud 14 and are arranged at equal angles around the center of the fan-shaped guide shroud 14. The wedge-shaped tips of the plurality of side guide plates face the adjacent inclined surface of the V-shaped structure.

[0046] The above technical solution diverts the protective gas discharged from the fan-shaped guide shroud 14 through the middle guide plate, and in conjunction with the side guide plates, makes the protective gas converge towards the lower surface of the protective lens.

[0047] In a further embodiment, the second guide plate group 16 includes a plurality of square guide plates disposed on the arc-shaped surface adjacent to the guide chamber 12 and the protective lens, and the square guide plates and the middle guide plate are arranged alternately.

[0048] The above technical solution uses square guide plates arranged in an alternating pattern with the central guide plate to fully deflect the protective gas, allowing the protective gas to be blown evenly toward the protective lens and effectively removing dust from the lower surface of the protective lens.

[0049] In a further embodiment, the air inlet end of the guide channel 11 is provided with a connecting part 10, and one end of the air guide pipe 8 is inserted into the connecting part 10.

[0050] With the above technical solution, one end of the air guide tube 8 is fixed by the connecting part 10, so that the protective gas can enter the guide channel 11 through the air guide tube 8.

[0051] In a further embodiment, a galvanometer fixing plate 3 is provided above the top plate 1, and the galvanometer body 2 is fixed on the galvanometer fixing plate 3.

[0052] The above technical solution uses the galvanometer fixing plate 3 to fix the galvanometer body 2, thereby stabilizing the galvanometer body 2.

[0053] Working principle: When the wind farm system is running, the galvanometer unit operates, and the control valve 9, which is electrically connected to the galvanometer unit, opens, delivering the protective gas from the gas supply cylinder 7 to the guide channel 11 through the gas guide pipe 8. The protective gas delivered to the guide channel 11 is introduced into the guide chamber 12 through the connecting hole 13. The protective gas entering the guide chamber 12 through the connecting hole 13 is diffused in a fan shape by the fan-shaped guide hood 14. The protective gas discharged from the fan-shaped guide hood 14 is diverted by the middle guide plate. With the help of the side guide plates, the protective gas in the upper channel is deflected. The protective gas in the lower channel is fully deflected by the square guide plates arranged alternately with the middle guide plate. The deflected protective gas is discharged from the air outlet of the guide chamber 12 and blown towards the lower surface of the protective lens corresponding to the working galvanometer unit, blowing away the adhering substances on the lower surface of the protective lens, making the protective lens clear, ensuring the light transmittance of the protective lens, and ensuring the precision of laser melting.

[0054] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.

Claims

1. A protective mirror purging system for a laser powder melting additive manufacturing equipment, the protective mirror comprising a fixing plate (6) mounted on a top plate (1) for supporting a galvanometer device in the equipment and a plurality of protective lenses embedded in the fixing plate (6), characterized in that, The blowing system includes a blowing device and a control device for blowing the protective lens. The blowing device includes a flow guiding mechanism on the fixed plate (6) and an air supply assembly above the fixed plate (6). The air supply assembly is used to supply protective gas to the flow guiding mechanism. The control device is electrically connected to the air supply assembly. The flow guiding mechanism includes a plurality of flow guiding channels (11) on the fixed plate (6) corresponding to the protective lens one by one. One end of the flow guiding channel (11) is connected to the air supply component, and the other end of the flow guiding channel (11) is connected to the flow guiding chamber (12). The outlet of the flow guiding chamber (12) faces the adjacent protective lens. The flow guiding chamber (12) is provided with a deflection mechanism for fully blowing the protective gas discharged from the outlet of the flow guiding chamber (12) toward the lower surface of the protective lens. The gas supply assembly includes a gas supply bottle (7) located above the fixed plate (6), and a plurality of gas supply pipes (8) are installed on the gas supply bottle (7) and are connected to the guide channel (11) one by one. The control device includes a plurality of control valves (9) provided on the air duct (8), and the control valves (9) are electrically connected one-to-one with a plurality of galvanometer devices located above the protective lens; When a set of galvanometer devices is working, the control valve (9) electrically connected to the set of galvanometer devices is opened, and the protective gas in the gas supply cylinder (7) is transported to the guide channel (11) through the corresponding gas guide pipe (8) and discharged from the outlet of the guide chamber (12), blowing towards the lower surface of the protective lens corresponding to the set of galvanometer devices, blowing away the adhering substances on the lower surface of the protective lens.

2. The protective mirror blowing system for laser powder melting additive manufacturing equipment according to claim 1, characterized in that: The gas supply cylinder (7) is installed on the top of the top plate (1). The gas supply cylinder (7) is located on one side of the multiple sets of galvanometer devices. The gas supply cylinder (7) has a gas supply section corresponding to the number of sets of galvanometer devices at its outlet end. The gas guide pipes (8) of several guide channels (11) on a set of galvanometer devices are connected to one of the gas supply sections. The control valve (9) is located on the gas supply section.

3. The protective mirror blowing system for laser powder melting additive manufacturing equipment according to claim 2, characterized in that: The galvanometer device includes a galvanometer body (2) and a collimating lens (4) located outside the galvanometer body (2). The device includes a laser printing box, a top plate (1) located on the top of the laser printing box, and the galvanometer body (2) located above the top plate (1). The galvanometer body (2) includes several galvanometer units. A field lens (5) corresponding to each galvanometer unit is located below the galvanometer unit. The protective lens is located below the field lens (5).

4. The protective mirror blowing system for laser powder melting additive manufacturing equipment according to claim 1, characterized in that: The flow deflector includes a connecting hole (13) on the flow guide chamber (12) and connected to the air outlet of the flow guide channel (11). A first flow guide plate group (15) is provided in the flow guide chamber (12) on one side of the connecting hole (13), and a second flow guide plate group (16) is provided in the flow guide chamber (12) on one side of the first flow guide plate group (15).

5. A protective mirror blowing system for laser powder melting additive manufacturing equipment according to claim 4, characterized in that: The flow guide chamber (12) has a V-shaped structure with its opening facing the protective lens. The side of the flow guide chamber (12) adjacent to the protective lens has an arc shape that matches the outer edge of the protective lens. The first flow guide plate group (15) is arranged in the upper flow channel of the flow guide chamber (12), and the second flow guide plate group (16) is arranged in the lower flow channel of the flow guide chamber (12).

6. A protective mirror blowing system for laser powder melting additive manufacturing equipment according to claim 5, characterized in that: The flow guide chamber (12) is provided with a fan-shaped flow guide hood (14) located on one side of the connecting hole (13), and the exhaust direction of the fan-shaped flow guide hood (14) is towards the first flow guide plate group (15) and the second flow guide plate group (16).

7. A protective mirror blowing system for laser powder melting additive manufacturing equipment according to claim 6, characterized in that: The first guide plate group (15) includes several middle guide plates disposed in the middle of the guide chamber (12) and several side guide plates disposed at the inner edge of the guide chamber (12) and located outside the middle guide plates. Both the middle guide plates and the side guide plates are wedge-shaped structures. The wedge-shaped tips of the middle guide plates face the fan-shaped guide shroud (14) and are set at equal angles around the center of the fan-shaped guide shroud (14). The wedge-shaped tips of the side guide plates face the adjacent inclined surface of the V-shaped structure.

8. A protective mirror blowing system for laser powder melting additive manufacturing equipment according to claim 7, characterized in that: The second guide plate group (16) includes several square guide plates disposed on the arc-shaped surface of the guide chamber (12) adjacent to the protective lens, and the square guide plates are arranged alternately with the middle guide plate.

9. A protective mirror blowing system for laser powder melting additive manufacturing equipment according to claim 1, characterized in that: The air inlet end of the guide channel (11) is provided with a connecting part (10), and one end of the air guide pipe (8) is inserted into the connecting part (10).

10. A protective mirror blowing system for laser powder melting additive manufacturing equipment according to claim 3, characterized in that: A galvanometer fixing plate (3) is provided above the top plate (1), and the galvanometer body (2) is fixed on the galvanometer fixing plate (3).

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