Metal powder 3D printing equipment

Abstract

The invention relates to the field of 3D printing, and discloses metal powder 3D printing equipment which comprises a shell, valves are slidably connected to the front side and the rear side of the shell in a sleeving mode, a feeding mechanism is arranged at the bottom of an inner cavity of the shell and composed of a powder shell, a bulldozing mechanism and a carrying mechanism, and a main shaft mechanism is movably connected to the middle of the powder shell in a sleeving mode. The mounting plate movably sleeves the upper portion of the spindle mechanism and fixedly sleeves the upper portion of an inner cavity of the shell, and mounting grooves are formed in the left side and the right side of the mounting plate. By replacing different optical mode mechanisms and adopting the high-power laser with the condensation area covering the surface of the mask block, rapid and high-precision printing of the whole 3D model section is achieved, and the problems that an existing reciprocating scanning type laser printing device is long in printing time and low in precision are solved.

Description

Technical Field

[0001] The present application relates to the field of 3D printing technology, and in particular to a metal powder 3D printing device. Background Art

[0002] Metal powder 3D printing is an advanced manufacturing technology that builds three-dimensional objects layer by layer. It is particularly suitable for the manufacture of complex geometries. This type of equipment is widely used in a variety of fields, including aerospace, automotive, and medical devices.

[0003] Existing metal 3D printing equipment usually uses a reciprocating scanning laser printing method during the printing process, and the laser head scans the powder layer point by point or line by line to complete the cross-section forming. This method has problems such as low printing efficiency, poor forming accuracy, complex equipment structure and high maintenance cost. In addition, the metal powder is easily unevenly distributed during the printing process, resulting in unstable printing quality. At the same time, existing equipment mostly operates independently in auxiliary processes such as powder filling and laying, making it difficult to achieve synchronous and coordinated operation of multiple processes, further affecting the overall printing efficiency. Summary of the Invention

[0004] This application proposes a metal powder 3D printing device with the advantages of process synchronization and high printing efficiency, which is used to solve the problem of low printing efficiency of scanning metal powder 3D printing devices.

[0005] To achieve the above objectives, the present application adopts the following technical solution: a metal powder 3D printing device, comprising a housing, with valves slidably sleeved on the front and rear sides of the housing, and further comprising: A feeding mechanism, the feeding mechanism being arranged at the bottom of the inner cavity of the shell; The feeding mechanism is composed of a powder shell, a flattening mechanism and a loading mechanism; A main shaft mechanism, the main shaft mechanism being movably sleeved on the middle portion of the powder shell; A mounting plate, the mounting plate being movably sleeved on the upper portion of the spindle mechanism, the mounting plate being fixedly sleeved on the upper portion of the inner cavity of the housing, and mounting grooves being provided on the left and right sides of the mounting plate; Two retractable mechanisms, the two retractable mechanisms are respectively arranged in the middle of the two mounting slots; Two laser mechanisms, the two laser mechanisms are arranged on the front and rear sides of the bottom surface of the mounting plate; A turntable, the turntable is movably sleeved on the upper part of the spindle mechanism, the turntable is movably sleeved on the housing, a plurality of limiting holes are fixedly installed at equal intervals on the upper surface of the turntable, and the mounting plate is located above the turntable; A plurality of supporting mechanisms, wherein the plurality of supporting mechanisms are respectively arranged in the middle of the plurality of limiting holes; A plurality of optical module mechanisms are respectively arranged in the middle of the retractable mechanism and the supporting mechanism.

[0006] Preferably, the powder shell includes a powder slot, which is provided on the upper surface of the powder shell. Guide slots are symmetrically provided on the left and right sides of the upper surface of the powder slot, and the loading mechanism is provided in the middle of the guide slots.

[0007] Preferably, the push-flattening mechanism includes a connecting ring, which is fixedly sleeved on the middle part of the main shaft mechanism. A plurality of push pieces are fixedly installed at equal intervals on the bottom end of the connecting ring, and the bottom surface of the push pieces is a smooth plane.

[0008] Preferably, the carrier mechanism includes a first threaded seat, which is fixedly installed at the bottom of the inner cavity of the guide groove, a first threaded rod is movably sleeved in the middle of the first threaded seat, a first gear is fixedly sleeved at the bottom end of the first threaded rod, and a carrier seat is threadedly connected to the top of the first threaded rod, the carrier seat is slidably sleeved in the guide groove, a vent hole is provided in the middle of the first threaded rod, the fitting clearance between the carrier seat and the guide groove is smaller than the minimum diameter of the metal powder for printing, and the thread directions of the first threaded rods of the front carrier mechanism and the rear carrier mechanism are opposite.

[0009] Preferably, the spindle mechanism includes a spindle, which is movably sleeved in the middle of the powder shell, a passive wheel is fixedly sleeved on the top of the spindle, a first intermittent wheel is fixedly sleeved on the top of the spindle, a second intermittent wheel is fixedly sleeved on the bottom of the spindle, the second intermittent wheel is intermittently meshed with the first gear, the connecting ring is fixedly sleeved in the middle of the spindle, and a gap is left between the spindle and the middle of the powder shell.

[0010] Preferably, the retractable mechanism includes a circular sleeve, which is fixedly sleeved in the middle of the mounting groove, and a plurality of guide rods are fixedly installed at equal intervals on the inner circumference of the circular sleeve. A second threaded seat is fixedly installed on the upper part of the inner cavity of the circular sleeve, and the middle part of the second threaded seat is threadedly connected to a second threaded rod, and the upper part of the second threaded rod is slidingly sleeved with a second gear, and the second gear is intermittently meshed with the first intermittent wheel, and the first intermittent wheel is slidingly sleeved in the middle of the second gear, and the bottom of the second threaded rod is movably sleeved with a magnetic plate, and the magnetic plate is slidingly sleeved with the circular sleeve and the guide rod, and the thread directions of the second threaded seats of the retractable mechanism on the left and the retractable mechanism on the right are opposite.

[0011] Preferably, the laser mechanism includes a laser housing, which is fixedly mounted on the bottom surface of the mounting plate, a laser is fixedly mounted on the top of the inner cavity of the laser housing, and a lens is fixedly sleeved on the bottom of the inner cavity of the laser housing.

[0012] Preferably, the support mechanism includes a limiting sleeve, which is fixedly sleeved on the bottom of the inner curved surface of the limiting hole, and a plurality of limiting blocks are fixedly installed at equal intervals on the top circumference of the limiting sleeve, and the limiting blocks are fixedly connected to the limiting hole.

[0013] Preferably, the optical mold mechanism includes a mask sleeve, which is slidably sleeved on the middle part of the circular sleeve, and the mask sleeve is slidably sleeved on the guide rod. A mask block is fixedly sleeved on the middle part of the mask sleeve, and multiple mask blocks respectively etch cross-sectional light-transmitting patterns at different heights of the 3D model.

[0014] Preferably, a first driving member is fixedly installed on the left side of the shell, a first driving wheel is fixedly installed on the output end of the first driving member, the first driving wheel is engaged with the turntable, a second driving member is fixedly installed on the front side of the upper surface of the mounting plate, and a second driving wheel is fixedly installed on the output end of the second driving member.

[0015] The beneficial effects of the present invention are as follows: 1. The present invention starts the second driving member in the forward direction. The output end of the second driving member drives the main shaft mechanism to rotate through the second driving wheel. The main shaft mechanism drives the carrier of the rear side carrier mechanism to move downward a short distance. At the same time, the main shaft mechanism drives the carrier of the front side carrier mechanism to move upward a short distance, so that the metal powder in the inner cavity of the front guide groove moves upward to fill the metal powder in the inner cavity of the powder tank, thereby realizing continuous and automatic replenishment of the metal powder consumed by the rear side 3D model printing. At the same time, the rotating carrier mechanism pushes the metal powder in the inner cavity of the powder tank to At the same time, the spindle mechanism drives the retracting and extending mechanism on the left side to recycle the used optical mold mechanism in the inner cavity of the left limiting hole, and the spindle mechanism drives the retracting and extending mechanism on the right side to place the new optical mold mechanism in the middle of the right limiting hole, thereby leaving the metal powder layer required for printing on the upper surface of the left object carrier, recycling the used optical mold mechanism in the inner cavity of the left limiting hole, and placing the new optical mold mechanism in the inner cavity of the right limiting hole, so as to realize the simultaneous execution of multiple processes and improve printing efficiency.

[0016] 2. The present invention starts a first driving member, and the output end of the first driving member drives the first driving wheel to rotate. The first driving wheel drives the turntable to rotate. The turntable drives the optical mold mechanism in the inner cavity of the right limiting hole to rotate to directly above the rear object carrier. Then, the rear laser is started. The light coil emitted by the laser penetrates the transparent area of the mask block at its bottom and is blocked by the non-transparent area of the mask block. Then, the high-energy laser focusing surface of the cross-sectional shape of the 3D model is irradiated onto the top of the metal powder of the rear object carrier and solidifies the metal powder. Then, the first driving member is started again. The output end of the first driving member drives the used optical mold mechanism in the middle of the rear limiting hole of the turntable to move to directly below the left retracting mechanism through the first driving wheel. In this way, by replacing different optical mold mechanisms and using a laser made of a high-power existing laser component whose focusing area covers the surface of the mask block, the entire 3D model cross section can be quickly and high-precision printed, overcoming the problems of long printing time and low precision of existing reciprocating scanning laser printing equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which constitute a part of the specification, illustrate embodiments disclosed in the present application and, together with the description, serve to explain the principles disclosed in the present application in a clear and understandable manner.

[0018] The present disclosure can be more clearly understood from the following detailed description with reference to the accompanying drawings, in which: Figure 1 This is a schematic diagram of the overall appearance of the present invention; Figure 2 This is a schematic structural diagram of the feeding mechanism of the present invention; Figure 3 Schematic diagram of the structure of the object-carrying mechanism of the present invention; Figure 4 This is a schematic diagram of the spindle mechanism structure of the present invention; Figure 5 This is a schematic diagram of the structure of the retractable mechanism of the present invention; Figure 6 This is a schematic diagram of the laser mechanism structure of the present invention; Figure 7 It is a schematic diagram of the optical module structure of the present invention.

[0019] Wherein: 1. Housing; 101. Valve; 2. Feeding mechanism; 3. Powder shell; 301. Powder trough; 302. Guide groove; 4. Pushing mechanism; 401. Connecting ring; 402. Pushing piece; 5. Carrying mechanism; 501. First threaded seat; 502. First threaded rod; 503. First gear; 504. Carrying seat; 6. Spindle mechanism; 601. Spindle; 602. Driven pulley; 603. First intermittent pulley; 604. Second intermittent pulley; 7. Mounting plate; 701. Mounting groove; 8. Retracting and releasing mechanism; 801. Round sleeve; 802, guide rod; 803, second threaded seat; 804, second threaded rod; 805, second gear; 806, magnetic plate; 9, laser mechanism; 901, laser housing; 902, laser; 903, lens; 10, turntable; 1001, limiting hole; 11, supporting mechanism; 1101, limiting sleeve; 1102, limiting block; 12, optical module mechanism; 1201, mask sleeve; 1202, mask block; 13, first driving member; 1301, first driving wheel; 14, second driving member; 1401, second driving wheel. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0021] See also Figures 1 to 7 As shown, a metal powder 3D printing device includes a housing 1, with valves 101 slidably sleeved on the front and rear sides of the housing 1, and further includes: The feeding mechanism 2 is arranged at the bottom of the inner cavity of the shell 1; The feeding mechanism 2 is composed of a powder shell 3, a flattening mechanism 4 and a loading mechanism 5; The main shaft mechanism 6 is movably sleeved on the middle part of the powder shell 3; The mounting plate 7 is movably sleeved on the upper part of the spindle mechanism 6, and the mounting plate 7 is fixedly sleeved on the upper part of the inner cavity of the housing 1. The left and right sides of the mounting plate 7 are provided with mounting grooves 701; Two retracting and extending mechanisms 8, the two retracting and extending mechanisms 8 are respectively arranged in the middle of the two mounting slots 701; Two laser mechanisms 9, which are arranged on the front and rear sides of the bottom surface of the mounting plate 7; The turntable 10 is movably sleeved on the upper part of the spindle mechanism 6. The turntable 10 is movably sleeved with the housing 1. A plurality of limiting holes 1001 are fixedly installed at equal intervals on the upper surface of the turntable 10. The mounting plate 7 is located above the turntable 10. Multiple supporting mechanisms 11, each of which is disposed in the middle of the multiple limiting holes 1001; Multiple optical module mechanisms 12, which are respectively arranged in the middle of the retractable mechanism 8 and the supporting mechanism 11; When in use, the valve 101 is moved upward to place the required materials at relative positions inside the printing device.

[0022] See also Figures 1 to 3 As shown, the powder shell 3 includes a powder slot 301, which is provided on the upper surface of the powder shell 3. Guide slots 302 are symmetrically provided on the left and right sides of the upper surface of the powder slot 301, and the loading mechanism 5 is provided in the middle of the guide slot 302. The height of the metal powder placed in the powder tank 301 is less than one third of the height of the powder tank 301 , thereby preventing the metal powder from flowing out of the inner cavity of the guide tank 302 when the metal powder is flattened by the flattening mechanism 4 .

[0023] See also Figures 1 to 3 As shown, the push-flattening mechanism 4 includes a connecting ring 401, which is fixedly sleeved on the middle part of the spindle mechanism 6, and a plurality of push pieces 402 are fixedly installed at equal intervals on the bottom end of the connecting ring 401; The bottom surface of the push piece 402 is a smooth plane, so that the height of the metal powder pushed by the push piece 402 remains uniform, thereby keeping the thickness of the metal powder covering layer on the top layer of the 3D printed part consistent, thereby keeping the strength of the printed model consistent.

[0024] See also Figure 2 and Figure 3 As shown, the object carrying mechanism 5 includes a first threaded seat 501, which is fixedly mounted on the bottom of the inner cavity of the guide groove 302. A first threaded rod 502 is movably sleeved in the middle of the first threaded seat 501, a first gear 503 is fixedly sleeved in the bottom end of the first threaded rod 502, and an object carrying seat 504 is threadedly connected to the top of the first threaded rod 502. The object carrying seat 504 is slidably sleeved in the guide groove 302. Among them, a vent hole is opened in the middle of the first threaded rod 502, so that when the first threaded rod 502 drives the carrier 504 to move up and down, the air pressure between the inner cavity of the carrier 504 and the top of the first threaded rod 502 is kept consistent with the atmospheric pressure, reducing the air pressure resistance when the carrier 504 moves up and down, and the fitting clearance between the carrier 504 and the guide groove 302 is smaller than the minimum diameter of the metal powder for printing, so as to prevent the metal powder from falling into the contact gap between the carrier 504 and the guide groove 302, resulting in an increase in the resistance of the carrier 504 to move up and down along the guide groove 302. The thread directions of the first threaded rod 502 of the front side carrier mechanism 5 and the rear side carrier mechanism 5 are opposite.

[0025] See also Figures 2 to 6As shown, the spindle mechanism 6 includes a spindle 601, which is movably sleeved in the middle of the powder shell 3. The top of the spindle 601 is fixedly sleeved with a passive wheel 602, the top of the spindle 601 is fixedly sleeved with a first intermittent wheel 603, the bottom of the spindle 601 is fixedly sleeved with a second intermittent wheel 604, the second intermittent wheel 604 is intermittently meshed with the first gear 503, and the connecting ring 401 is fixedly sleeved in the middle of the spindle 601; A gap is left between the main shaft 601 and the middle of the powder shell 3, thereby reducing the friction resistance between the main shaft 601 and the powder shell 3 when the main shaft 601 rotates, thereby reducing the rotational load of the second driving member 14 when the second driving member 14 drives the main shaft 601 to rotate through the second driving wheel 1401 and the driven wheel 602.

[0026] See also Figure 2 、 Figure 4 and Figure 5 As shown, the retracting and releasing mechanism 8 includes a circular sleeve 801, which is fixedly sleeved in the middle of the mounting groove 701, and a plurality of guide rods 802 are fixedly installed at equal intervals on the inner curved surface circumference of the circular sleeve 801. A second threaded seat 803 is fixedly installed on the upper part of the inner cavity of the circular sleeve 801, and the middle part of the second threaded seat 803 is threadedly connected to the second threaded rod 804, and the upper part of the second threaded rod 804 is slidably sleeved with a second gear 805, which is intermittently meshed with the first intermittent wheel 603, and the first intermittent wheel 603 is slidably sleeved in the middle of the second gear 805, and the bottom of the second threaded rod 804 is movably sleeved with a magnetic plate 806, which is slidably sleeved with the circular sleeve 801 and the guide rod 802.

[0027] Among them, the thread directions of the second threaded seat 803 of the left-side retracting mechanism 8 and the right-side retracting mechanism 8 are opposite, so that when the spindle mechanism 6 drives the second threaded seat 803 to rotate through the second threaded rod 804, the second threaded seat 803 on one side drives the second gear 805 to move downward, releasing the optical mold mechanism 12 adsorbed at its bottom, and the second threaded seat 803 on the other side drives the second gear 805 to move upward, adsorbing and recovering the used optical mold mechanism 12, thereby realizing rapid replacement and recovery of the optical mold mechanism 12.

[0028] See also Figure 1 、 Figure 2 and Figure 7 As shown, the laser mechanism 9 includes a laser housing 901, which is fixedly mounted on the bottom surface of the mounting plate 7. A laser 902 is fixedly mounted on the top of the inner cavity of the laser housing 901, and a lens 903 is fixedly sleeved on the bottom of the inner cavity of the laser housing 901. The laser 902 is made of a high-power existing laser component whose focusing area covers the upper surface of the mask block 1202, so that the light coil emitted by the laser 902 penetrates the transparent area of the mask block 1202 and is blocked by the non-transparent area of the mask block 1202, and then the high-energy laser focusing surface of the cross-sectional shape of the 3D model is irradiated onto the metal powder rice on the printing surface of the 3D model, thereby realizing rapid printing of the entire 3D model and overcoming the problem of slow speed of existing scanning laser printing.

[0029] See also Figure 4 and Figure 5 As shown, the support mechanism 11 includes a limiting sleeve 1101, which is fixedly sleeved on the bottom of the inner curved surface of the limiting hole 1001. A plurality of limiting blocks 1102 are fixedly installed on the top of the limiting sleeve 1101 at equal intervals. The limiting blocks 1102 are fixedly connected to the limiting hole 1001. Among them, the limit block 1102 and the guide rod 802 are in the same position, so that the mask block 1202 can be positioned through the mask sleeve 1201, avoiding the deflection of the mask block 1202, causing the problem of uneven edges of the 3D model after printing, and improving printing accuracy.

[0030] See also Figure 4 、 Figure 5 and Figure 7 As shown, the optical mold mechanism 12 includes a mask sleeve 1201, which is slidably sleeved on the middle part of the circular sleeve 801, and the mask sleeve 1201 is slidably sleeved on the guide rod 802, and the middle part of the mask sleeve 1201 is fixedly sleeved with a mask block 1202; Among them, multiple mask blocks 1202 respectively etch cross-sectional light-transmitting patterns at different heights of the 3D model, thereby realizing laser projection to transfer the design pattern on the mask block 1202 to the 3D model printing layer, thereby realizing printing of a 3D model of corresponding shape. The mask cover 1201 and the second gear 805 are both made of magnets, so that the second gear 805 drives multiple mask covers 1201 to move upward through magnetic adsorption, and the mask cover 1201 drives the mask block 1202 to move upward.

[0031] See also Figure 1 and Figure 2 As shown, a first driving member 13 is fixedly mounted on the left side of the housing 1, and a first driving wheel 1301 is fixedly mounted on the output end of the first driving member 13. The first driving wheel 1301 is engaged with the turntable 10. A second driving member 14 is fixedly mounted on the front side of the upper surface of the mounting plate 7, and a second driving wheel 1401 is fixedly mounted on the output end of the second driving member 14. The first driving member 13 drives the turntable 10 to rotate via the first driving wheel 1301 , and the second driving member 14 drives the spindle mechanism 6 to rotate via the second driving wheel 1401 .

[0032] Working principle: When the present invention is used, metal powder is poured into the inner cavity of the powder tank 301, and the height of the metal powder is slightly higher than the top surface of the left object carrier 504, and then the second driving member 14 is started in the positive direction, and the output end of the second driving member 14 drives the second driving wheel 1401 to rotate, the second driving wheel 1401 drives the driven wheel 602 to rotate, the driven wheel 602 drives the main shaft 601 to rotate, and the main shaft 601 drives the first intermittent wheel 603, the second intermittent wheel 604 and the push-flattening mechanism 4 to rotate, the first intermittent wheel 603 is meshed with the second gears 805 on the left and right sides, the second intermittent wheel 604 is meshed with the front and rear first gears 503, and the rear first gear is engaged. 503 drives the rear side carrier 504 to move downward a short distance via the rear side first threaded rod 502. At the same time, the front side first gear 503 drives the front side carrier 504 to move upward a short distance via the front side first threaded rod 502, so that the metal powder in the inner cavity of the front guide groove 302 moves upward, filling the metal powder in the inner cavity of the powder tank 301, thereby realizing continuous and automatic replenishment of the metal powder consumed by the rear side 3D model printing. The rotating flattening mechanism 4 flattens the metal powder in the inner cavity of the powder tank 301, leaving a metal powder layer required for printing on the upper surface of the rear side carrier 504; At the same time, the first intermittent wheel 603 drives the second gears 805 on the left and right sides to rotate, and the left second gear 805 drives the left magnetic plate 806 to move downward through the left second threaded rod 804, and the magnetic plate 806 drives the used optical mold mechanism 12 in the inner cavity of the left limiting hole 1001 to move upward and separate from the limiting hole 1001 through the mutual attraction of multiple optical mold mechanisms 12. At the same time, the right second gear 805 drives the right magnetic plate 806 to move downward through the right second threaded rod 804, and the right magnetic plate 806 moves the bottommost optical mold mechanisms 12 that attract each other downward to the inner cavity of the rightmost limiting hole 1001, thereby leaving a metal powder layer required for printing on the upper surface of the left object carrier 504, while recycling the used optical mold mechanism 12 in the inner cavity of the left limiting hole 1001, and placing a new optical mold mechanism 12 in the inner cavity of the right limiting hole 1001; Then, the first driving member 13 is started. The output end of the first driving member 13 drives the first driving wheel 1301 to rotate. The first driving wheel 1301 drives the turntable 10 to rotate. The turntable 10 drives the optical mold mechanism 12 in the inner cavity of the right limiting hole 1001 to rotate to the top of the rear side carrier 504. Then, the rear side laser 902 is started. The light coil emitted by the laser 902 penetrates the transparent area of the mask block 1202 at its bottom and is blocked by the non-transparent area of the mask block 1202. Then, the high-energy laser focusing surface of the cross-sectional shape of the 3D model is irradiated onto the metal powder on the rear side carrier 504, and the metal powder is solidified. Then, the first driving member 13 is started again. The output end of the first driving member 13 drives the used optical mold mechanism 12 in the middle of the limiting hole 1001 on the rear side of the turntable 10 to move to the bottom of the left retracting mechanism 8 through the first active wheel 1301, and repeats the above operation, thereby achieving fast and high-precision printing of the entire 3D model printing section by replacing different optical mold mechanisms 12 and using a laser 902 made of a high-power existing laser component with a focusing area covering the surface of the mask block 1202. In addition, after printing is completed, the 3D model can be flipped upside down and printed again by reversing the second driving member 14, thereby overcoming the problems of long printing time and low precision of existing reciprocating scanning laser printing equipment.

[0033] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A metal powder 3D printing device, comprising a housing (1), wherein valves (101) are slidably sleeved on the front and rear sides of the housing (1), characterized in that: Also includes: A feeding mechanism (2), the feeding mechanism (2) being arranged at the bottom of the inner cavity of the housing (1); The feeding mechanism (2) is composed of a powder shell (3), a flattening mechanism (4) and a loading mechanism (5); A main shaft mechanism (6), the main shaft mechanism (6) being movably sleeved on the middle portion of the powder shell (3); a mounting plate (7), the mounting plate (7) being movably sleeved on the upper portion of the spindle mechanism (6), the mounting plate (7) being fixedly sleeved on the upper portion of the inner cavity of the housing (1), and mounting grooves (701) being provided on the left and right sides of the mounting plate (7); Two retractable mechanisms (8), the two retractable mechanisms (8) being respectively arranged in the middle of the two mounting slots (701); Two laser mechanisms (9), the two laser mechanisms (9) being arranged on the front and rear sides of the bottom surface of the mounting plate (7); A turntable (10), the turntable (10) being movably sleeved on the upper portion of the spindle mechanism (6), the turntable (10) being movably sleeved on the housing (1), a plurality of limiting holes (1001) being fixedly mounted at equal intervals on the upper surface of the turntable (10), and the mounting plate (7) being located above the turntable (10); A plurality of support mechanisms (11), wherein the plurality of support mechanisms (11) are respectively arranged in the middle of the plurality of limiting holes (1001); A plurality of optical module mechanisms (12) are respectively arranged in the middle of the retractable mechanism (8) and the supporting mechanism (11).

2. The metal powder 3D printing device according to claim 1, characterized in that: The powder shell (3) comprises a powder slot (301), the powder slot (301) being provided on the upper surface of the powder shell (3), guide slots (302) being symmetrically provided on the left and right sides of the upper surface of the powder slot (301), and the object carrying mechanism (5) being provided in the middle of the guide slot (302).

3. The metal powder 3D printing device according to claim 2, characterized in that: The push-flattening mechanism (4) comprises a connecting ring (401), the connecting ring (401) being fixedly sleeved on the middle part of the main shaft mechanism (6), a plurality of push pieces (402) being fixedly mounted at equal intervals on the bottom end of the connecting ring (401), and the bottom surface of the push pieces (402) being a smooth plane.

4. The metal powder 3D printing device according to claim 3, characterized in that: The object carrier mechanism (5) comprises a first threaded seat (501), the first threaded seat (501) is fixedly mounted on the bottom of the inner cavity of the guide groove (302), a first threaded rod (502) is movably sleeved in the middle of the first threaded seat (501), a first gear (503) is fixedly sleeved in the bottom end of the first threaded rod (502), a top of the first threaded rod (502) is threadedly connected to an object carrier seat (504), the object carrier seat (504) is slidably sleeved in the guide groove (302), a vent hole is provided in the middle of the first threaded rod (502), a fitting clearance between the object carrier seat (504) and the guide groove (302) is smaller than the minimum diameter of the metal powder for printing, and the thread directions of the first threaded rods (502) of the front-side object carrier mechanism (5) and the rear-side object carrier mechanism (5) are opposite.

5. The metal powder 3D printing device according to claim 4, characterized in that: The spindle mechanism (6) includes a spindle (601), the spindle (601) is movably sleeved in the middle of the powder shell (3), the top of the spindle (601) is fixedly sleeved with a passive wheel (602), the top of the spindle (601) is fixedly sleeved with a first intermittent wheel (603), the bottom of the spindle (601) is fixedly sleeved with a second intermittent wheel (604), the second intermittent wheel (604) is intermittently meshed with the first gear (503), the connecting ring (401) is fixedly sleeved in the middle of the spindle (601), and a gap is left between the spindle (601) and the middle of the powder shell (3).

6. The metal powder 3D printing device according to claim 5, characterized in that: The retracting and unfolding mechanism (8) comprises a circular sleeve (801), the circular sleeve (801) being fixedly sleeved in the middle of the mounting groove (701), a plurality of guide rods (802) being fixedly mounted at equal intervals on the inner circumference of the curved surface of the circular sleeve (801), a second threaded seat (803) being fixedly mounted on the upper portion of the inner cavity of the circular sleeve (801), a second threaded rod (804) being threadedly connected to the middle portion of the second threaded seat (803), and a second gear (804) being slidably sleeved on the upper portion of the second threaded rod (804). 805), the second gear (805) is intermittently meshed with the first intermittent wheel (603), the first intermittent wheel (603) is slidably sleeved on the middle part of the second gear (805), the bottom of the second threaded rod (804) is movably sleeved with a magnetic plate (806), the magnetic plate (806) is slidably sleeved with the circular sleeve (801) and the guide rod (802), and the thread directions of the second threaded seat (803) of the retractable mechanism (8) on the left and the retractable mechanism (8) on the right are opposite.

7. The metal powder 3D printing device according to claim 6, characterized in that: The laser mechanism (9) comprises a laser shell (901), the laser shell (901) being fixedly mounted on the bottom surface of the mounting plate (7), a laser (902) being fixedly mounted on the top end of the inner cavity of the laser shell (901), and a lens (903) being fixedly sleeved on the bottom end of the inner cavity of the laser shell (901).

8. The metal powder 3D printing device according to claim 7, characterized in that: The support mechanism (11) comprises a limiting sleeve (1101), the limiting sleeve (1101) is fixedly sleeved on the bottom of the inner curved surface of the limiting hole (1001), a plurality of limiting blocks (1102) are fixedly installed at equal intervals on the top circumference of the limiting sleeve (1101), and the limiting blocks (1102) are fixedly connected to the limiting hole (1001).

9. The metal powder 3D printing device according to claim 8, characterized in that: The optical mold mechanism (12) comprises a mask sleeve (1201), the mask sleeve (1201) being slidably sleeved on the middle part of the circular sleeve (801), the mask sleeve (1201) being slidably sleeved on the guide rod (802), a mask block (1202) being fixedly sleeved on the middle part of the mask sleeve (1201), and a plurality of the mask blocks (1202) respectively etching cross-sectional light-transmitting patterns at different heights of the 3D model.

10. The metal powder 3D printing device according to claim 9, characterized in that: A first driving member (13) is fixedly mounted on the left side of the housing (1), a first driving wheel (1301) is fixedly mounted on the output end of the first driving member (13), the first driving wheel (1301) and the turntable (10) are engaged with each other, a second driving member (14) is fixedly mounted on the front side of the upper surface of the mounting plate (7), and a second driving wheel (1401) is fixedly mounted on the output end of the second driving member (14).

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