Heat dissipation device for metal 3D printing and 3D printing equipment

Abstract

The invention belongs to the technical field of 3D printing, and discloses a heat dissipation device for metal 3D printing and 3D printing equipment, the heat dissipation device comprises a shell and a rotating shaft located in a cavity of the shell, rectangular heat dissipation fan blades are integrally fixed to the lower end of the rotating shaft, a driving shaft rotationally connected with the shell penetrates through the top surface of the shell, and the driving shaft is driven by an external motor; a clamping block is integrally fixed to the lower end of the driving shaft, a clamping groove matched with the clamping block is formed in the upper end of the rotating shaft, and a first adjusting mechanism used for driving the rectangular cooling fan blades to move in the vertical direction is arranged in the shell. The rotating shaft and the rectangular heat dissipation fan blades can rotate along with the driving shaft to complete heat dissipation work; and by arranging the first adjusting mechanism and the second adjusting mechanism, the rectangular heat dissipation fan blades can move downwards to the preset position and then move in the horizontal direction, metal powder in the printing box is scraped to be flat, and the rectangular heat dissipation fan blades can further serve as a powder scraping plate.

Description

Technical Field

[0001] The invention belongs to the technical field of 3D printing, and in particular is a heat dissipation device for metal 3D printing. Background Art

[0002] Metal 3D printing uses laser melting technology to melt metal powder to form functional solid parts. It is a fully digital rapid prototyping manufacturing process that directly produces high-density metal parts based on the interface data of the three-dimensional CAD layer. The thickness of the melted metal layer ranges from 20 microns to 100 microns. When manufacturing parts, the metal rapid prototyping-3D printer first uses a scraper to evenly distribute the metal layer, and then melts each metal layer separately in a strictly controlled air environment. After the printed model is removed, it is post-processed, including cleaning and curing, grinding, mechanical polishing, chemical polishing, coloring and other steps.

[0003] The design process of 3D printing is: first modeling through computer modeling software, then "partitioning" the built 3D model into layer-by-layer cross-sections, i.e. slices, to guide the printer to print layer by layer. The standard file format for collaboration between design software and printers is the STL file format. An STL file uses triangular faces to approximate the surface of an object. The smaller the triangular face, the higher the surface resolution it generates. PLY is a scanner that generates 3D files by scanning, and the VRML or WRL files it generates are often used as input files for full-color printing.

[0004] After printing is completed, the metal parts often need to be cooled so that the staff can take them out. Traditional cooling fans often complete the heat dissipation work by rotating to speed up the flow of surrounding air. Most cooling fans are fixed in a certain position and can only perform heat dissipation work. It is difficult to move to other positions to complete other tasks in the 3D printing equipment, resulting in the cooling fan's function being relatively single.

[0005] For example, the Chinese invention patent (application number: CN201711259043.1) discloses a "metal 3D printing device for printing high-strength and high-precision models". Its specification discloses: From the perspective of heat dissipation and curing of printed parts, the existing technical solutions for heat dissipation and shaping devices for metal 3D printing equipment generally use blade-type mechanical fans to dissipate heat. This method has low heat dissipation efficiency because it is powered by a motor and has a certain amount of noise. The longer the fan runs, the greater the noise. Due to the mechanical structure, it occupies a large space and is inconvenient to install near the 3D printing head, which is already small. Once the blade fan is installed, the wind direction is fixed, and heat can only be dissipated in a single direction, and heat cannot be dissipated in a 360-degree direction around the print head. This leads to the problem of uneven heat dissipation. Furthermore, the blade-type mechanical fan has only the single function of heat dissipation, and cannot remove dust and purify the air inside the 3D printer, nor does it have the function of eliminating static electricity in the internal space; the above patents can prove the defects of the existing technology. Summary of the invention

[0006] In order to solve the problem that the cooling fan has a relatively single function as mentioned in the above background technology, the present invention provides a cooling device for metal 3D printing.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a heat dissipation device for metal 3D printing, comprising a shell, and a rotating shaft located in the cavity of the shell, wherein a rectangular heat dissipation fan blade is integrally fixed to the lower end of the rotating shaft, a driving shaft rotatably connected to the shell passes through the top surface of the shell, the driving shaft is driven by an external motor, and a card block is integrally fixed to the lower end of the driving shaft, a card slot that is adapted to the card block is provided at the upper end of the rotating shaft, and an adjustment mechanism 1 for driving the rectangular heat dissipation fan blade to move in a vertical direction and an adjustment mechanism 2 for driving the rectangular heat dissipation fan blade to move in a horizontal direction are arranged in the shell.

[0008] Preferably, the adjustment mechanism 1 includes a rectangular frame 1 and a rectangular frame 2 which are located in the outer shell and are symmetrically distributed, a transverse rod is fixedly connected between the rectangular frame 1 and the rectangular frame 2, a movable block is sleeved on the transverse rod and is slidably connected to the transverse rod, a support plate is vertically fixed to the surface of the movable block, and the rotating shaft passes through the support plate and is rotatably connected to the support plate.

[0009] Preferably, a threaded rod 1 and an external spline shaft parallel to each other are rotatably connected in the outer shell, and both the threaded rod 1 and the external spline shaft are driven by an external motor. An internal threaded sleeve mounted on the threaded rod 1 is penetrated through the rectangular frame 1, and an internal spline shaft mounted on the external spline shaft is penetrated through the rectangular frame 2.

[0010] Preferably, the second adjusting mechanism includes a first bevel gear located in the second rectangular frame and sleeved on the internal spline shaft, a second bevel gear rotatably connected in the second rectangular frame and meshing with the first bevel gear, a threaded rod two coaxially fixed with the second bevel gear is rotatably connected between the first and second rectangular frames, and the movable block is penetrated by the second threaded rod and threadedly connected thereto.

[0011] The present invention also provides a 3D printing device, comprising the above-mentioned heat dissipation device for metal 3D printing, and also comprising a printing box located in a shell, wherein two partitions are integrally fixed in the printing box to divide the interior of the printing box into three independent spaces, and a lifting plate is provided in each space of the printing box, and a lifting mechanism for driving the lifting plate to move in a vertical direction is provided in the shell.

[0012] Preferably, the lifting mechanism includes an internally threaded rod rotatably connected to the three spaces of the print box respectively, a threaded rod three threadedly connected to the upper end of the internally threaded rod is inserted, and the upper end of the threaded rod three is fixedly connected to the lower surface of the lifting plate, wherein the threaded rod three close to the threaded rod one has the same thread direction as a threaded rod three located in the middle position, and the thread direction of the other threaded rod three is opposite to that of the threaded rod three.

[0013] Preferably, a third bevel gear is sleeved on the internal threaded rod, a fourth bevel gear meshing with the third bevel gear is rotatably connected to the side wall of the print box, a circular gear coaxially fixed with the fourth bevel gear is rotatably connected to the outer side of the print box, a round rod is fixedly connected to the surface of the movable block, a load-bearing rod is vertically fixed to the lower end of the round rod, three L-shaped mounting rods are fixedly connected to the surface of the load-bearing rod, and the free ends of the three L-shaped mounting rods are fixedly connected to racks.

[0014] Preferably, the rectangular heat dissipation fan blade is a hollow structure, and a plurality of circular holes for sucking metal powder are provided on the lower surface of the rectangular heat dissipation fan blade, a bending tube which is interconnected with the interior of the rectangular heat dissipation fan blade is fixedly connected to the surface of the rectangular heat dissipation fan blade, a strip groove is provided on the rear surface of the outer shell, a slider is slidably connected in the strip groove, a powder suction tube is plugged into the slider, a locking assembly is provided on the powder suction tube, and the end of the powder suction tube located on the outside of the outer shell is connected to an external dust suction device.

[0015] Preferably, the locking assembly comprises two L-rods 1 fixed on the surface of the powder suction pipe and symmetrically distributed, the free ends of the two L-rods 1 are telescopically connected with L-rod 2, a circular plate is sleeved on the L-rod 2, a spring sleeved on L-rod 2 is fixedly connected between the circular plate and the L-rod 1, and the free ends of the two L-rods 2 are fixedly connected with a ramp block.

[0016] Preferably, the bending tube is inclined from bottom to top from the side close to the L-rod to the side away from the L-rod, a disc is sleeved on the bending tube, and baffles are fixed on the sides of the two inclined blocks close to the L-rod.

[0017] Compared with the prior art, the present invention has the following beneficial effects: By setting an adjustment mechanism one to facilitate driving the rectangular heat dissipation fan blades to move in the vertical direction, and by setting an adjustment mechanism two to facilitate driving the rectangular heat dissipation fan blades to move in the horizontal direction, the rectangular heat dissipation fan blades can move downward to a preset position and then move in the horizontal direction to scrape the metal powder in the print box flat, so that the rectangular heat dissipation fan blades can not only rotate to dissipate heat, but also act as a powder scraper.

[0018] By setting up a lifting mechanism, the lifting plate located in the middle position and the lifting plate close to one side of the threaded rod can be driven to move downward to sink the metal powder. At the same time, the lifting plate close to the external spline shaft can be driven to move upward to lift the metal powder inside it so that it can be scraped flat by the rectangular heat dissipation fan blades later.

[0019] By setting a locking assembly, the ends of the bending tube and the powder suction tube can be tightly fitted, and the metal powder in the print box can be sucked out through an external dust suction device. At this time, the rectangular heat dissipation fan blade can act as a powder suction port, moving in the horizontal direction while sucking in the dust, and sucking away all the metal powder in the print box to facilitate the removal of the metal parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the structure of the connection between the rotating shaft and the driving shaft in the present invention.

[0022] Figure 3 For the present invention Figure 1 Schematic diagram of the enlarged structure at point A in the middle.

[0023] Figure 4 For the present invention Figure 1 Schematic diagram of the enlarged structure at point B in the middle.

[0024] Figure 5 For the present invention Figure 1 Schematic diagram of the enlarged structure at point C in the middle.

[0025] Figure 6 The lifting mechanism structure of the present invention is shown in FIG. Figure 1 .

[0026] Figure 7 The lifting mechanism structure of the present invention is shown in FIG. Figure 2 .

[0027] Figure 8 The lifting mechanism structure of the present invention is shown in FIG. Figure 3 .

[0028] Fig. 9 The locking assembly structure of the present invention is schematically shown in FIG. Figure 1 .

[0029] Fig.10 The locking assembly structure of the present invention is schematically shown in FIG. Figure 2 .

[0030] In the figure: 1, housing; 21, rotating shaft; 22, rectangular cooling fan blade; 23, driving shaft; 24, clamping block; 25, clamping slot; 3, adjusting mechanism 1; 31, threaded rod 1; 32, external spline shaft; 33, rectangular frame 1; 34, rectangular frame 2; 35, transverse rod; 36, movable block; 37, supporting plate; 38, internal threaded sleeve; 39, internal spline shaft; 4, adjusting mechanism 2; 41, first bevel gear; 42, second bevel gear; 43, threaded rod 2; 51, printing box; 52, partition ; 53. lifting plate; 6. lifting mechanism; 61. internal threaded rod; 62. threaded rod three; 63. third bevel gear; 64. fourth bevel gear; 65. circular gear; 66. circular rod; 67. load-bearing rod; 68. L-shaped mounting rod; 69. rack; 71. bending tube; 72. strip groove; 73. slider; 74. powder suction tube; 8. locking assembly; 81. L rod one; 82. L rod two; 83. circular plate; 84. spring; 85. inclined block; 86. baffle; 87. disc. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] like Figure 1 to Figure 2 As shown, the present invention provides a heat dissipation device for metal 3D printing, including a shell 1, and a rotating shaft 21 located in the cavity of the shell 1, a rectangular heat dissipation fan blade 22 is integrally fixed to the lower end of the rotating shaft 21, a driving shaft 23 rotatably connected to the shell 1 passes through the top surface of the shell 1, the driving shaft 23 is driven by an external motor, and a clamping block 24 is integrally fixed to the lower end of the driving shaft 23, and a clamping groove 25 that matches the clamping block 24 is opened at the upper end of the rotating shaft 21.

[0033] By adopting the above solution, the rotating shaft 21 and the rectangular heat dissipation blades 22 can not only rotate with the driving shaft 23 to complete the heat dissipation work, but also move to other positions.

[0034] like Figures 1 to 5 As shown, the housing 1 is provided with an adjusting mechanism 1 3 for driving the rectangular heat dissipation blades 22 to move in the vertical direction, and an adjusting mechanism 2 4 for driving the rectangular heat dissipation blades 22 to move in the horizontal direction.

[0035] like Figures 1 to 5 As shown, the adjustment mechanism 1 3 includes a rectangular frame 1 33 and a rectangular frame 2 34 which are symmetrically distributed in the housing 1, a transverse rod 35 is fixedly connected between the rectangular frame 1 33 and the rectangular frame 2 34, a movable block 36 which is slidably connected to the transverse rod 35 is sleeved on the transverse rod 35, a support plate 37 is vertically fixed to the surface of the movable block 36, and the rotating shaft 21 passes through the support plate 37 and is rotatably connected to the support plate 37; like Figures 1 to 5 As shown, a threaded rod 1 31 and an external spline shaft 32 are rotatably connected in parallel in the housing 1, and both the threaded rod 1 31 and the external spline shaft 32 are driven by an external motor. An internal threaded sleeve 38 sleeved on the threaded rod 1 31 is penetrated through the rectangular frame 1 33, and an internal spline shaft 39 sleeved on the external spline shaft 32 is penetrated through the rectangular frame 2 34; The outer spline shaft 32 can prevent the rectangular frame 1 33 , the rectangular frame 2 34 , and the transverse rod 35 from rotating along with the rotation of the threaded rod 1 31 , and the inner spline shaft 39 can move up and down along the outer spline shaft 32 and can also rotate along with the outer spline shaft 32 .

[0036] like Figures 1 to 5 As shown, the adjustment mechanism 2 4 includes a first bevel gear 41 located in the rectangular frame 2 34 and sleeved on the internal spline shaft 39, a second bevel gear 42 meshing with the first bevel gear 41 is rotatably connected in the rectangular frame 2 34, a threaded rod 2 43 coaxially fixed with the second bevel gear 42 is rotatably connected between the rectangular frame 1 33 and the rectangular frame 2 34, and the movable block 36 is penetrated by the threaded rod 2 43 and threadedly connected thereto; The transverse rod 35 can limit the movement of the movable block 36 and prevent the movable block 36 from rotating along with the threaded rod 43 .

[0037] like Figures 6 to 8 As shown, a 3D printing device includes a printing box 51 located in a housing 1, two partitions 52 are integrally fixed in the printing box 51 to divide the interior of the printing box into three independent spaces, and a lifting plate 53 is provided in each space of the printing box 51, and a lifting mechanism 6 for driving the lifting plate 53 to move along the vertical direction is provided in the housing 1; In use, the three spaces of the print box 51 are filled with metal powder, and the metal powder in the three spaces is scraped flat by the rectangular heat dissipation blades 22 and is at the same horizontal position, wherein the laser scans the metal powder in the middle space; Then the lifting plate 53 near the outer spline shaft 32 moves upward to lift the metal powder inside it, and the lifting plate 53 in the middle and the lifting plate 53 near the threaded rod 31 move downward to sink the metal powder. Finally, the raised metal powder is scraped flat by the rectangular heat dissipation blades 22, so that another layer of metal powder is laid on the position previously scanned by the laser, so as to continue the laser melting and finally form a metal part; like Figures 6 to 8 As shown, the lifting mechanism 6 includes an internal threaded rod 61 rotatably connected to the three spaces of the printing box 51, and the upper end of the internal threaded rod 61 is plugged with a threaded rod 3 62 threadedly connected thereto, and the upper end of the threaded rod 3 62 is fixedly connected to the lower surface of the lifting plate 53; Since the lifting plate 53 is rectangular and the edge of the lifting plate 53 is attached to the inner wall of the printing box 51, the lifting plate 53 and the threaded rod 3 62 cannot rotate, and the internal threaded rod 61 can drive the threaded rod 3 62 and the lifting plate 53 to move in the vertical direction when rotating; The threaded rod three 62 near the threaded rod one 31 and the threaded rod three 62 located in the middle have the same thread direction, and the threaded rod three 62 has the opposite thread direction. Therefore, when the three internally threaded rods 61 rotate in the same direction, two of the lifting plates 53 move downward, and the other lifting plate 53 moves upward.

[0038] like Figures 6 to 8 As shown, a third bevel gear 63 is sleeved on the internal threaded rod 61, a fourth bevel gear 64 meshing with the third bevel gear 63 is rotatably connected to the side wall of the print box 51, a circular gear 65 coaxially fixed with the fourth bevel gear 64 is rotatably connected to the outer side of the print box 51, a round rod 66 is fixedly connected to the surface of the movable block 36, a bearing rod 67 is vertically fixed to the lower end of the round rod 66, three L-shaped mounting rods 68 are fixedly connected to the surface of the bearing rod 67, and the free ends of the three L-shaped mounting rods 68 are fixedly connected to racks 69; When the rack 69 moves downward to a preset position, it can mesh with the circular gear 65 and drive the circular gear 65 to rotate.

[0039] like Figures 9 and 10 As shown, the rectangular heat dissipation fan blade 22 is a hollow structure, and a plurality of circular holes for sucking metal powder are provided on the lower surface of the rectangular heat dissipation fan blade 22, a bending tube 71 which is interconnected with the interior of the rectangular heat dissipation fan blade 22 is fixedly connected to the surface of the rectangular heat dissipation fan blade 22, a strip groove 72 is provided on the rear surface of the outer shell 1, a slider 73 is slidably connected in the strip groove 72, a powder suction pipe 74 is inserted on the slider 73, a locking assembly 8 is provided on the powder suction pipe 74, and the powder suction pipe 74 is located at one end outside the outer shell 1 and is connected to an external dust suction device.

[0040] When the locking assembly 8 tightly fits the ends of the bending tube 71 and the powder suction tube 74 together, the external vacuum device is started to suck out the metal powder in the print box 51. At this time, the rectangular heat dissipation fan blades 22 can act as a powder suction port, moving horizontally while sucking in dust to suck out all the metal powder in the print box 51.

[0041] The locking assembly 8 includes two L-rods 81 fixed on the surface of the powder suction pipe 74 and symmetrically distributed. The free ends of the two L-rods 81 are telescopically plugged with L-rods 82. A circular plate 83 is sleeved on the L-rods 82. A spring 84 sleeved on the L-rods 82 is fixedly connected between the circular plate 83 and the L-rod 81. The free ends of the two L-rods 82 are fixedly connected with inclined blocks 85. The upper surface of the inclined block 85 is inclined, sloping from bottom to top from the side close to the L rod 81 to the side away from the L rod 81. A disc 87 is sleeved on the bending tube 71, and baffles 86 are fixed to the sides of the two inclined blocks 85 close to the L rod 81.

[0042] The working principle and use process of the present invention: When the block 24 is stuck in the slot 25, the drive shaft 23 is driven by the motor to rotate, which can drive the rotating shaft 21 to rotate, and the rotating shaft 21 can drive the rectangular heat dissipation blades 22 to rotate accordingly to complete the heat dissipation work; When the rectangular heat dissipation blade 22 is required to act as a powder scraper, the motor drives the threaded rod 1 31 to rotate, and the threaded rod 1 31 can drive the internal threaded sleeve 38 and the rectangular frame 1 33 to move downward to a preset position, and the rectangular frame 1 33 can drive the transverse rod 35, the threaded rod 2 43 and the rectangular frame 2 34 to move downward accordingly, thereby driving the movable block 36, the support plate 37, the rotating shaft 21 and the rectangular heat dissipation blade 22 to move downward to a preset position; Then, the motor drives the outer spline shaft 32 to rotate, and the outer spline shaft 32 can drive the inner spline shaft 39 to rotate accordingly, and the inner spline shaft 39 can drive the first bevel gear 41 sleeved on its surface to rotate accordingly, and the first bevel gear 41 can drive the second bevel gear 42 meshing with it to rotate accordingly, and the second bevel gear 42 can drive the second threaded rod 43 coaxially fixed thereto to rotate accordingly, and the second threaded rod 43 can drive the movable block 36, the support plate 37, the rotating shaft 21 and the rectangular heat dissipation blades 22 to move in the horizontal direction, so that the rectangular heat dissipation blades 22 scrape the metal powder flat; The movable block 36 is driven to move downward. The movable block 36 can move downward through the round rod 66 and the bearing rod 67. The bearing rod 67 can drive the rack 69 to move downward through the L-shaped mounting rod 68. After the rack 69 moves downward to a preset position, it can mesh with the circular gear 65 and drive the circular gear 65 to rotate. The circular gear 65 can drive the fourth bevel gear 64 coaxially fixed thereto to rotate accordingly. The fourth bevel gear 64 can drive the third bevel gear 63 meshing therewith to rotate accordingly. The third bevel gear 63 can drive the internal threaded rod 61 to rotate. The internal threaded rod 61 can drive the lifting plate 53 to move in the vertical direction through the threaded rod three 62. A lifting plate 53 near the threaded rod 31 and a lifting plate 53 in the middle move downward, and another lifting plate 53 moves upward to lift the metal powder upward; When the bending tube 71 moves downward following the rectangular heat dissipation blades 22, the disc 87 can gradually push the inclined surfaces of the two inclined plane blocks 85, so that the inclined plane blocks 85 move away from the L-bar 81, so that the spring 84 can exert a pulling force on the bending tube 71, so that the ends of the bending tube 71 and the powder suction tube 74 fit tightly, and the disc 87 is clamped by the two baffles 86; The external dust suction device is started to suck out the metal powder in the printing box 51 through the circular hole at the bottom of the rectangular heat dissipation fan blade 22, and at the same time, the rectangular heat dissipation fan blade 22 is driven to reciprocate in the horizontal direction to suck out the metal powder.

[0043] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A heat dissipation device for metal 3D printing, comprising a housing (1), and a rotating shaft (21) located in a cavity of the housing (1), characterized in that: A rectangular heat dissipation fan blade (22) is integrally fixed to the lower end of the rotating shaft (21); a driving shaft (23) rotatably connected to the rotating shaft (21) passes through the top surface of the housing (1); the driving shaft (23) is driven by an external motor, and a clamping block (24) is integrally fixed to the lower end of the driving shaft (23); a clamping groove (25) adapted to the clamping block (24) is provided at the upper end of the rotating shaft (21); and an adjusting mechanism (3) for driving the rectangular heat dissipation fan blade (22) to move in a vertical direction and an adjusting mechanism (4) for driving the rectangular heat dissipation fan blade (22) to move in a horizontal direction are arranged in the housing (1).

2. The heat dissipation device for metal 3D printing according to claim 1, characterized in that: The adjustment mechanism 1 (3) comprises a rectangular frame 1 (33) and a rectangular frame 2 (34) which are symmetrically arranged in the housing (1); a transverse rod (35) is fixedly connected between the rectangular frame 1 (33) and the rectangular frame 2 (34); a movable block (36) which is slidably connected to the transverse rod (35) is sleeved on the transverse rod (35); a support plate (37) is vertically fixed to the surface of the movable block (36); and the rotating shaft (21) passes through the support plate (37) and is rotatably connected to the support plate (37).

3. The heat dissipation device for metal 3D printing according to claim 2, characterized in that: A threaded rod (31) and an external spline shaft (32) are rotatably connected in parallel with each other in the housing (1); the threaded rod (31) and the external spline shaft (32) are both driven by an external motor; an internal threaded sleeve (38) sleeved on the threaded rod (31) is passed through the rectangular frame (33); and an internal spline shaft (39) sleeved on the external spline shaft (32) is passed through the rectangular frame (34).

4. The heat dissipation device for metal 3D printing according to claim 3, characterized in that: The second adjustment mechanism (4) comprises a first bevel gear (41) located in the second rectangular frame (34) and sleeved on the internal spline shaft (39); a second bevel gear (42) meshing with the first bevel gear (41) is rotatably connected in the second rectangular frame (34); a threaded rod (43) coaxially fixed with the second bevel gear (42) is rotatably connected between the first rectangular frame (33) and the second rectangular frame (34); and the movable block (36) is penetrated by the threaded rod (43) and is threadedly connected thereto.

5. A 3D printing device, comprising the heat dissipation device for metal 3D printing according to claim 4, characterized in that: The invention also comprises a printing box (51) located in the housing (1), wherein two partitions (52) are integrally fixed in the printing box (51) for dividing the interior of the printing box into three independent spaces, and a lifting plate (53) is arranged in each space of the printing box (51), and a lifting mechanism (6) for driving the lifting plate (53) to move in a vertical direction is arranged in the housing (1).

6. The 3D printing device according to claim 5, characterized in that: The lifting mechanism (6) comprises an internally threaded rod (61) rotatably connected to three spaces of the printing box (51), the upper end of the internally threaded rod (61) is plugged with a threaded rod 3 (62) threadedly connected thereto, the upper end of the threaded rod 3 (62) is fixedly connected to the lower surface of the lifting plate (53), wherein the threaded rod 3 (62) close to one side of the threaded rod 1 (31) and the threaded rod 3 (62) located in the middle position have the same thread direction, and the threaded rod 3 (62) has the opposite thread direction.

7. The 3D printing device according to claim 6, characterized in that: A third bevel gear (63) is sleeved on the internal threaded rod (61); a fourth bevel gear (64) meshing with the third bevel gear (63) is rotatably connected to the side wall of the print box (51); a circular gear (65) coaxially fixed with the fourth bevel gear (64) is rotatably connected to the outer side of the print box (51); a round rod (66) is fixedly connected to the surface of the movable block (36); a bearing rod (67) is vertically fixed to the lower end of the round rod (66); three L-shaped mounting rods (68) are fixedly connected to the surface of the bearing rod (67); and free ends of the three L-shaped mounting rods (68) are fixedly connected to racks (69).

8. The 3D printing device according to claim 7, characterized in that: The rectangular heat dissipation blade (22) is a hollow structure, and a plurality of circular holes for sucking metal powder are provided on the lower surface of the rectangular heat dissipation blade (22). A bent tube (71) which is interconnected with the interior of the rectangular heat dissipation blade (22) is fixedly connected to the surface of the rectangular heat dissipation blade (22). A strip groove (72) is provided on the rear surface of the shell (1). A slider (73) is slidably connected in the strip groove (72). A powder suction pipe (74) is plugged into the slider (73). A locking assembly (8) is provided on the powder suction pipe (74). One end of the powder suction pipe (74) located outside the shell (1) is connected to an external dust suction device.

9. The 3D printing device according to claim 8, characterized in that: The locking assembly (8) comprises two L-shaped rods (81) fixed on the surface of the powder suction pipe (74) and symmetrically distributed, the free ends of the two L-shaped rods (81) are telescopically plugged with L-shaped rods (82), a circular plate (83) is sleeved on the L-shaped rod (82), a spring (84) sleeved on the L-shaped rod (82) is fixedly connected between the circular plate (83) and the L-shaped rod (81), and the free ends of the two L-shaped rods (82) are fixedly connected with inclined blocks (85).

10. The 3D printing device according to claim 9, characterized in that: The upper surface of the inclined surface block (85) is inclined, and is inclined from bottom to top from the side close to the L-bar (81) to the side away from the L-bar (81). A disc (87) is sleeved on the bending tube (71). Baffles (86) are fixed to the sides of the two inclined surface blocks (85) close to the L-bar (81).

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