Cooling device for laser 3D printer

Abstract

The invention provides a cooling device for a laser 3D printer. The cooling device comprises a 3D printer body, a lifting table, a laser head, a middle partition conduction mechanism, a heat transfer circulation flow part, a backflow supply part and an air cooling module. The lifting table is arranged in the 3D printer body, the laser head is arranged on the lifting table, the middle partition conduction mechanism is arranged on the lifting table and the laser head, and the heat transfer circulating flow part is arranged on the 3D printer body, the lifting table and the middle partition conduction mechanism. The backflow supply part is arranged on the heat transfer circulation part, and the air cooling module is arranged on the 3D printer body; according to the cooling device for the laser 3D printer, a heating source is accurately, effectively and stably cooled for a long time in an efficient heat dissipation mode, heat transmission is fundamentally reduced, an air cooling module is used for assisting with traditional air cooling heat dissipation, it is guaranteed that the excellent cooling effect is obtained under the combined action of double measures, and the cooling effect is improved. The temperature in the 3D printer body is practically and effectively controlled within a reasonable range, and stable work and high-quality printing of the 3D printer body are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printers, and in particular to a cooling device for a laser 3D printer. Background Art

[0002] SLS (Selective Laser Sintering) 3D printing technology is a type of digital laser sintering technology. It mainly uses two-dimensional laser scanning technology to sinter advanced powder materials accurately at the required position to form the required three-dimensional object shape.

[0003] The SLS printer first uses a laser to sinter the material into the first layer on the sintering platform. The high-energy heat generated by the laser source causes the powder material to fuse. Then the second layer of material is added and the laser irradiation completely fuses the second layer of material with the first layer. After repeated laser sintering and layer-by-layer stacking of materials, the desired three-dimensional object is finally obtained.

[0004] Most of the materials printed by laser sintering 3D printers are metal powder materials, so the laser beam power it emits is very high to ensure that the powder particles can be sintered together smoothly. In addition, in order to reduce thermal deformation during the printing process and facilitate the combination of each layer of powder, the workbench needs to preheat the powder layer and heat it to a temperature slightly lower than the melting point of the powder. Therefore, the internal molding temperature of the laser sintering 3D printer during the printing process generally reaches hundreds of degrees. Therefore, the cooling facilities used by the laser 3D printer are an important part of ensuring its stable operation and high-quality printing; and the existing cooling system on the laser 3D printer has certain defects. The internal temperature of the laser 3D printer is very high during the printing process. The coolant will absorb a lot of heat during the circulation cooling, causing the temperature to rise rapidly, thereby greatly accelerating its own deterioration speed, and then causing the heat transfer cooling effect to continue to decline, and the laser 3D printer cannot be stably cooled. Summary of the invention

[0005] The purpose of the present invention is to provide a cooling device for a laser 3D printer to solve the above problems.

[0006] In order to achieve the above-mentioned object, the present invention provides a cooling device for a laser 3D printer, comprising: a 3D printer body, a lifting platform, a laser head, a partition conduction mechanism, a heat transfer circulation part, a reflux supply part and an air cooling module; The lifting platform is arranged in the 3D printer body, the laser head is arranged on the lifting platform, the intermediate conduction mechanism is arranged on the lifting platform and the laser head, the heat transfer circulation part is arranged on the 3D printer body, the lifting platform and the intermediate conduction mechanism, the reflux supply part is arranged on the heat transfer circulation part, and the air cooling module is arranged on the 3D printer body; The heat transfer circulation part and the reflux supply part are connected to each other, wherein The intermediate conduction mechanism is suitable for being attached to the laser head and half-covering it, so as to absorb and transfer the heat of the laser head; Driving the heat transfer circulation part can allow the external cooling liquid to be input into the 3D printer body and flow evenly on the intermediate conduction mechanism, so as to continuously complete the heat exchange with the intermediate conduction mechanism; The reflux supply unit is suitable for recovering and storing the external cooling liquid flowing in the heat transfer circulation unit.

[0007] Furthermore, the heat transfer circulation part includes an L-shaped load-bearing platform, a lower pad, a first water tank, a submersible pump, an internal transmission pipe, a main pipe and a return pipe; The L-shaped load-bearing platform is fixedly installed at the rear of the 3D printer body, the lower pad is arranged at one end of the L-shaped load-bearing platform, the first water tank is arranged on the lower pad, the submersible pump is installed on the inner bottom surface of the first water tank, the main pipeline is uniformly distributed on the septum conduction mechanism in a continuous rotation shape, one end of the inner delivery pipe is inserted into the first water tank and connected to the submersible pump, the other end of the inner delivery pipe is inserted into the 3D printer body and connected to the inlet of the main pipeline, one end of the reflux pipe is connected to the outlet of the main pipeline, and the other end of the reflux pipe passes through the 3D printer body and is connected to the reflux supply part.

[0008] Further, the septum conduction mechanism comprises an overhead block and an outer conduction cover; The two overhead blocks are installed at the corners of the laser head, and the outer conductive cover is installed on the two overhead blocks and is located outside the laser head; The outer conductive cover is attached to the lifting platform; The body duct is disposed on the outer conductive shield.

[0009] Furthermore, the reflux supply unit includes an inner frame, a fan, an outer frame, a fixed plate, a second water tank, a water pump, a water pump pipe and a water supply pipe; The inner frame is arranged on the other end of the L-shaped load-bearing platform, the fan is installed in the inner frame, the outer frame is installed on the L-shaped load-bearing platform and is located at the periphery of the inner frame, a plurality of the fixed plate bodies are circumferentially arranged on the inner side wall of the outer frame, the second water tank is arranged between the plurality of the fixed plate bodies, and the second water tank is located directly above the fan, the water pump is arranged on the L-shaped load-bearing platform and is located between the first water tank and the second water tank, one end of the water pump passes through the outer frame and is connected to the second water tank, the other end of the water pump is connected to the water inlet of the water pump, one end of the water supply pipe is connected to the water outlet of the water pump, and the other end of the water supply pipe is connected to the first water tank.

[0010] Further, the reflux supply unit further comprises a pointed protrusion mounted on the bottom of the second water tank; The pointed protrusion is close to the fan; The L-shaped load-bearing platform is provided with a plurality of holes in an array at a position directly below the fan.

[0011] Furthermore, the heat transfer circulation unit further includes two sets of brackets of different numbers installed on both sides of the lifting platform, and two sleeves installed on the inner side wall of the 3D printer body; A portion of the inner delivery pipe and the return pipe are respectively embedded in two groups of brackets of different numbers; The two sleeves are respectively sleeved on the inner delivery pipe and the return pipe; A section of the inner delivery pipe and the return pipe close to the two sleeves is in a winding shape.

[0012] Furthermore, the two overhead blocks, the outer conductive cover, the main pipe and the second water tank are made of copper.

[0013] Furthermore, an inner filling port is provided on the top of the first water tank.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The cooling device for the laser 3D printer can absorb the heat generated by the laser head in real time and quickly through the intermediate conduction mechanism to complete the heat transfer, and then the heat on the intermediate conduction mechanism is subsequently taken away by the heat transfer circulation part to achieve indirect cooling of the laser head, while ensuring that the cooling effect is not affected and avoiding direct contact between the heat transfer circulation part containing liquid and the laser head, effectively improving the safety performance; The cooling device for the laser 3D printer can realize the circulation and uniform flow of the coolant in the 3D printer body and on the intermediate conduction mechanism through the heat transfer circulation part, so as to timely absorb and take away the heat of the intermediate conduction mechanism, indirectly complete the cooling of the laser head, and then effectively reduce the heat rampant in the 3D printer body at the source; The cooling device for the laser 3D printer can receive and store the used coolant flowing out of the heat transfer circulation part through the reflux supply part, and can prompt the coolant that has absorbed the excessive heat to quickly dissipate the heat in the reflux supply part, so that the temperature of the coolant is quickly reduced and then the coolant is replenished into the heat transfer circulation part again, thereby ensuring that the temperature of the coolant circulating in the 3D printer body is not too high, so that the coolant always maintains a large temperature difference with the temperature in the 3D printer body, so as to maintain the good performance of the coolant for a long time; The cooling device of the laser 3D printer uses an efficient heat dissipation method to accurately and stably cool the heat source for a long time, fundamentally reducing the spread of heat, and using an air cooling module supplemented by traditional air cooling to ensure that an excellent cooling effect is achieved under the joint action of the dual measures, effectively and effectively controlling the temperature inside the 3D printer body within a reasonable range, ensuring the stable operation and high-quality printing of the 3D printer body. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0016] Figure 1 A perspective view of the present invention is shown; Figure 2 A partial perspective view of the present invention is shown; Figure 3 A partial stereoscopic view of the present invention at another angle is shown; Figure 4 A partial rear perspective view of the present invention is shown; Figure 5 A partial front view of the present invention is shown; Figure 6 A partial rear view of the present invention is shown; Figure 7 A partial bottom perspective view of the present invention is shown; Figure 8 The present invention is shown Figure 2 A magnified image of point A; Fig. 9 The present invention is shown Figure 3 The enlarged view of point B; Fig.10 The present invention is shown Figure 4 Enlarged view of point C.

[0017] In the figures, the same reference numerals denote the same structural elements, wherein: 1. 3D printer body; 2. Lifting platform; 3. Laser head; 4. Intermediate conduction mechanism; 41. Overhead block; 42. External conduction cover; 5. Heat transfer circulation unit; 51. L-shaped load-bearing platform; 511. Hole; 52. Lower pad; 53. First water tank; 531. Internal injection port; 54. Submersible pump; 55. Internal delivery pipe; 56. Main pipeline; 57. Return pipe; 58. Bracket; 59. Sleeve; 6. Return supply unit; 61. Inner frame; 62. Fan; 63. External frame; 64. Fixed plate; 65. Second water tank; 66. Suction pump; 67. Suction pipe; 68. Water supply pipe; 69. Pointed bump; 7. Air cooling module. DETAILED DESCRIPTION

[0018] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0019] See also Figure 1 , Figure 1 A perspective view of the present invention is shown; see Figure 2 , Figure 2 A partial perspective view of the present invention is shown; see Figure 3 , Figure 3 Shows a partial stereoscopic view of the present invention at another angle; see Figure 4 , Figure 4 A partial perspective rear view of the present invention is shown; see Figure 5 , Figure 5 Shows a partial front view of the present invention; see Figure 6 , Figure 6 A partial rear view of the present invention is shown; see Figure 7 , Figure 7 A partial bottom perspective view of the present invention is shown; see Figure 8 , Figure 8 The present invention is shown Figure 2 See the enlarged view of point A in Fig. 9 , Fig. 9 The present invention is shown Figure 3 See the enlarged view of point B in Fig.10 , Fig.10 The present invention is shown Figure 4 The enlarged view of point C; Figure 1-10 As shown, a cooling device for a laser 3D printer includes: a 3D printer body 1, a lifting platform 2, a laser head 3, a partition conduction mechanism 4, a heat transfer circulation part 5, a reflux supply part 6 and an air cooling module 7; The lifting platform 2 is arranged in the 3D printer body 1, the laser head 3 is arranged on the lifting platform 2, the intermediate conduction mechanism 4 is arranged on the lifting platform 2 and the laser head 3, the heat transfer circulation part 5 is arranged on the 3D printer body 1, the lifting platform 2 and the intermediate conduction mechanism 4, the reflux supply part 6 is arranged on the heat transfer circulation part 5, and the air cooling module 7 is arranged on the 3D printer body 1. The air cooling module 7 is an existing air cooling and heat dissipation device on the market. During the printing process, the heat transfer circulation part 5 and the air cooling module 7 are used to cool down the temperature by using the dual effect of the heat transfer circulation part 5 and the air cooling module 7 to ensure a better cooling effect; The heat transfer circulation part 5 and the reflux supply part 6 are connected to each other. The intermediate conduction mechanism 4 is suitable for being attached to the laser head 3 and half-covering it, so as to absorb and transfer the heat of the laser head 3; Driving the heat transfer circulation part 5 can allow the external cooling liquid to be input into the 3D printer body 1 and flow evenly on the intermediate conduction mechanism 4, so as to complete the heat exchange with the intermediate conduction mechanism 4 uninterruptedly; The reflux supply part 6 is suitable for recovering and storing the external cooling liquid circulating in the heat transfer circulation part 5. The cooling device for the laser 3D printer can absorb the heat generated by the laser head 3 in real time and quickly through the intermediate conduction mechanism 4 to complete the heat transfer, and then the heat transfer circulation part 5 will subsequently take away the heat on the intermediate conduction mechanism 4 to achieve indirect cooling of the laser head 3, while ensuring that the cooling effect is not affected and avoiding direct contact between the heat transfer circulation part 5 containing liquid and the laser head 3, effectively improving the safety performance, and the heat transfer circulation part 5 can realize the circulation and uniform circulation of the cooling liquid in the 3D printer body 1 and on the intermediate conduction mechanism 4, so as to timely absorb and take away the heat of the intermediate conduction mechanism 4, indirectly complete the cooling of the laser head 3, and then effectively reduce the heat rampant in the 3D printer body 1 at the source, and the heat can be taken away by the heat transfer circulation part 6. The used coolant flowing out of the flow section 5 is received and stored, and the coolant that absorbs the overheat can be caused to quickly dissipate heat in the reflux supply section 6, so that the temperature of the coolant is quickly reduced and then the coolant is replenished into the heat transfer circulation section 5 again, thereby ensuring that the temperature of the coolant circulating in the 3D printer body 1 will not be too high, so that the coolant always maintains a large temperature difference with the temperature in the 3D printer body 1, so as to maintain the good performance of the coolant for a long time. The cooling device of the laser 3D printer accurately and effectively cools the heat source in a long-term stable manner in an efficient heat dissipation manner, fundamentally reducing the spread of heat, and using the air cooling module 7 in conjunction with traditional air cooling to ensure that an excellent cooling effect is obtained under the joint action of the dual measures, effectively and effectively controlling the temperature in the 3D printer body 1 within a reasonable range, and ensuring the stable operation and high-quality printing of the 3D printer body 1.

[0020] Optionally, the heat transfer circulation part 5 includes an L-shaped load-bearing platform 51, a lower pad 52, a first water tank 53, a submersible pump 54, an internal delivery pipe 55, a main pipe 56 and a return pipe 57; The L-shaped load-bearing platform 51 is fixedly installed at the rear of the 3D printer body 1, the lower pad 52 is arranged at one end of the L-shaped load-bearing platform 51, the first water tank 53 is arranged on the lower pad 52, the submersible pump 54 is installed on the inner bottom surface of the first water tank 53, the main pipe 56 is uniformly distributed on the septum conduction mechanism 4 in a continuous rotation shape, one end of the inner delivery pipe 55 is inserted into the first water tank 53 and connected to the submersible pump 54, and the other end of the inner delivery pipe 55 is inserted into the 3D printer The body 1 is connected to the inlet of the main pipe 56, one end of the return pipe 57 is connected to the outlet of the main pipe 56, and the other end of the return pipe 57 passes through the 3D printer body 1 and is connected to the return supply part 6. The first water tank 53 is filled with cooling liquid. When printing is in progress, the heat continuously emitted by the laser head 3 is absorbed by the intermediate conduction mechanism 4 in time, completing the transfer of heat from the laser head 3 to the intermediate conduction mechanism 4. At the same time, the cooling liquid in the first water tank 53 is sequentially pumped under the pressure of the submersible pump 54. The cooling liquid flows in the inner delivery pipe 55 and the main pipe 56, and finally flows to the reflux supply part 6 through the return pipe 57, so as to realize the flow of the cooling liquid in the 3D printer body 1 and on the surface of the septum conduction mechanism 4, ensuring that the cooling liquid can complete the heat exchange with the surface of the septum conduction mechanism 4 through the continuous flow of the cooling liquid, absorb and take away the heat contained in it, and then complete the indirect cooling of the laser head 3, fundamentally controlling the laser head 3 as a heat source to continuously emit heat in the 3D printer body 1; the evenly distributed main pipe 56 ensures that the surface of the septum conduction mechanism 4 is covered as much as possible, so as to ensure that the heat transferred from the laser head 3 on the septum conduction mechanism 4 can be absorbed and taken away in a timely and efficient manner; in addition, the inner delivery pipe 55, the main pipe 56 and the return pipe 57 in the 3D printer body 1 can also take away the heat dissipated inside the 3D printer body 1 to a certain extent, and cooperate with the air cooling module 7 to obtain multiple heat dissipation and cooling effects, ensuring that the overall temperature of the 3D printer body 1 can be controlled within a reasonable range, providing a solid guarantee for its stable operation and high-quality printing.

[0021] Optionally, the intermediate conduction mechanism 4 includes an overhead block 41 and an outer conduction cover 42; The two overhead blocks 41 are installed at the corners of the laser head 3, and the outer conductive cover 42 is installed on the two overhead blocks 41 and is located outside the laser head 3; The outer conductive cover 42 is attached to the lifting platform 2; The main pipe 56 is arranged on the outer conductive cover 42 to partially cover the laser head 3, forming an indirect heat dissipation mode for the laser head 3, avoiding direct contact between the heat transfer circulation part 5 and the laser head 3, thereby effectively preventing the coolant from being contaminated on the laser head 3 when the coolant in the heat transfer circulation part 5 leaks, thereby greatly improving safety.

[0022] Optionally, the reflux supply unit 6 includes an inner frame 61, a fan 62, an outer frame 63, a fixed plate 64, a second water tank 65, a water pump 66, a water pumping pipe 67 and a water supply pipe 68; The inner frame 61 is arranged on the other end of the L-shaped load-bearing platform 51, the fan 62 is installed in the inner frame 61, the outer frame 63 is installed on the L-shaped load-bearing platform 51 and is located on the periphery of the inner frame 61, a plurality of the fixed plate bodies 64 are circumferentially arranged on the inner side wall of the outer frame body 63, the second water tank 65 is arranged between the plurality of the fixed plate bodies 64, and the second water tank 65 is located directly above the fan 62, the water pump 66 is arranged on the L-shaped load-bearing platform 51 and is located between the first water tank 53 and the second water tank 65, one end of the water pump 67 passes through the outer frame 63 and is connected to the second water tank 65, the other end of the water pump 67 is connected to the water inlet of the water pump 66, one end of the water supply pipe 68 is connected to the water outlet of the water pump 66, the other end of the water supply pipe 68 is connected to the first water tank 53, and the coolant flowing out of the reflux pipe 57 enters the second water The second water tank 65 temporarily stores the coolant in the second water tank 65 so that the coolant can be naturally dried and slowly cooled. At the same time, the fan 62 is started to blow upwards so that there is wind blowing around the second water tank 65, thereby further accelerating the cooling speed of the coolant in the second water tank 65, and quickly dissipating the heat absorbed by the coolant when flowing in the 3D printer body 1, thereby ensuring that the coolant always maintains a large temperature difference with the temperature in the 3D printer body 1 to prevent the performance of the coolant from being reduced, thereby ensuring that the coolant circulating in the heat transfer circulation part 5 can have a long-term excellent heat transfer cooling effect, and cool the 3D printer body 1 well; after the second water tank 65 stores the coolant for a period of time, the water pump 66 is started to pump the coolant in the second water tank 65 back to the first water tank 53 to prevent the coolant in the first water tank 53 from being exhausted, thereby ensuring the circulation of the coolant in the 3D printer body 1 and on the outer conductive cover 42 during printing.

[0023] Optionally, the reflux supply unit 6 further includes a pointed bump 69 installed at the bottom of the second water tank 65; The pointed protrusion 69 is close to the fan 62. The pointed protrusion 69 with a smooth surface can smoothly disperse the wind when the fan 62 blows upward, ensuring that the wind blows upward along the periphery of the second water tank 65, so that the second water tank 65 is wrapped in the wind, thereby ensuring that the coolant in the second water tank 65 can be better dissipated and cooled, and preventing the wind blown by the fan 62 from directly hitting the flat bottom surface of the second water tank 65 and causing stagnation; A plurality of holes 511 are provided in an array on the L-shaped load-bearing platform 51 directly below the fan 62 to ensure good air circulation below the fan 62 and to ensure that sufficient air enters for the fan 62 to inhale, thereby forming a continuous airflow.

[0024] Optionally, the heat transfer circulation part 5 further includes two sets of brackets 58 of different numbers installed on both sides of the lifting platform 2, and two sleeves 59 installed on the inner side wall of the 3D printer body 1; Parts of the inner delivery pipe 55 and the return pipe 57 are respectively embedded in two groups of brackets 58 of different numbers; The two sleeves 59 are respectively sleeved on the inner delivery pipe 55 and the return pipe 57. The lifting platform 2 will move up layer by layer as the printing progresses. The inner delivery pipe 55 and the return pipe 57 are relatively fixed by two sets of brackets 58 and two sleeves 59 to prevent the inner delivery pipe 55 and the return pipe 57 from swinging randomly and obstructing the movement of the lifting platform 2, so as to prevent accidents. A section of the inner delivery pipe 55 and the return pipe 57 close to the two sleeves 59 is winding, that is, under normal circumstances, a part of the inner delivery pipe 55 and the return pipe 57 is in a relaxed state, ensuring that the inner delivery pipe 55 and the return pipe 57 can be gradually stretched as the lifting platform 2 rises to prevent interruption of the delivery of the coolant.

[0025] Optionally, the two overhead blocks 41, the outer conduction cover 42, the main pipe 56 and the second water tank 65 are made of copper, so that these components have excellent thermal conductivity. Specifically, it is ensured that the two overhead blocks 41 and the outer conduction cover 42 can promptly and quickly absorb and transfer the heat generated by the laser head 3, thereby ensuring the cooling effect while improving safety; ensuring that the coolant flowing in the main pipe 56 can efficiently exchange heat with the outer conduction cover 42 to absorb and take away its heat; and further accelerating the heat dissipation of the coolant in the second water tank 65.

[0026] Optionally, an inner filling port 531 is provided at the top of the first water tank 53. When the loss of coolant reaches a certain level, the first water tank 53 is promptly filled through the inner filling port 531 to avoid insufficient circulation of coolant, which may reduce the cooling effect.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A cooling device for a laser 3D printer, characterized in that: include: A 3D printer body (1), a lifting platform (2), a laser head (3), a partition conduction mechanism (4), a heat transfer circulation part (5), a reflux supply part (6) and an air cooling module (7); The lifting platform (2) is arranged in the 3D printer body (1), the laser head (3) is arranged on the lifting platform (2), the intermediate conduction mechanism (4) is arranged on the lifting platform (2) and the laser head (3), the heat transfer circulation part (5) is arranged on the 3D printer body (1), the lifting platform (2) and the intermediate conduction mechanism (4), the reflux supply part (6) is arranged on the heat transfer circulation part (5), and the air cooling module (7) is arranged on the 3D printer body (1); The heat transfer circulation part (5) and the reflux supply part (6) are connected to each other, wherein The intermediate conduction mechanism (4) is suitable for being attached to the laser head (3) and half-covering it, so as to absorb and transfer the heat of the laser head (3); Driving the heat transfer circulation part (5) allows the external cooling liquid to be input into the 3D printer body (1) and flow evenly on the intermediate conduction mechanism (4), so as to continuously complete the heat exchange with the intermediate conduction mechanism (4); The reflux supply section (6) is suitable for recovering and storing the external cooling liquid circulating in the heat transfer circulation section (5).

2. A cooling device for a laser 3D printer as claimed in claim 1, characterized in that: The heat transfer circulation part (5) comprises an L-shaped load-bearing platform (51), a lower cushion block (52), a first water tank (53), a submersible pump (54), an internal transmission pipe (55), a main pipe (56) and a return pipe (57); The L-shaped load-bearing platform (51) is fixedly mounted behind the 3D printer body (1); the lower pad (52) is arranged at one end of the L-shaped load-bearing platform (51); the first water tank (53) is arranged on the lower pad (52); the submersible pump (54) is mounted on the inner bottom surface of the first water tank (53); the main pipe (56) is evenly distributed on the septum conduction mechanism (4) in a continuous rotation shape; one end of the inner delivery pipe (55) is inserted into the first water tank (53) and connected to the submersible pump (54); the other end of the inner delivery pipe (55) is inserted into the 3D printer body (1) and connected to the inlet of the main pipe (56); one end of the return pipe (57) is connected to the outlet of the main pipe (56); the other end of the return pipe (57) passes through the 3D printer body (1) and is connected to the return supply part (6).

3. A cooling device for a laser 3D printer as claimed in claim 2, characterized in that: The intermediate conduction mechanism (4) comprises an overhead block (41) and an outer conduction cover (42); The two overhead blocks (41) are mounted at the corners of the laser head (3), and the outer conductive cover (42) is mounted on the two overhead blocks (41) and is located outside the laser head (3); The outer conductive cover (42) is attached to the lifting platform (2); The main body duct (56) is arranged on the outer conductive cover (42).

4. A cooling device for a laser 3D printer as claimed in claim 3, characterized in that: The reflux supply unit (6) comprises an inner frame (61), a fan (62), an outer frame (63), a fixed plate (64), a second water tank (65), a water pump (66), a water pumping pipe (67) and a water supply pipe (68); The inner frame (61) is arranged on the other end of the L-shaped load-bearing platform (51), the fan (62) is installed in the inner frame (61), the outer frame (63) is installed on the L-shaped load-bearing platform (51) and is located outside the inner frame (61), a plurality of fixed plates (64) are circumferentially arranged on the inner side wall of the outer frame (63), the second water tank (65) is arranged between the plurality of fixed plates (64), and the second water tank (65) is located directly opposite to the fan (62). Above, the water pump (66) is arranged on the L-shaped load-bearing platform (51) and is located between the first water tank (53) and the second water tank (65); one end of the water pumping pipe (67) passes through the external frame (63) and is connected to the second water tank (65); the other end of the water pumping pipe (67) is connected to the water inlet of the water pump (66); one end of the water supply pipe (68) is connected to the water outlet of the water pump (66); and the other end of the water supply pipe (68) is connected to the first water tank (53).

5. A cooling device for a laser 3D printer as claimed in claim 4, characterized in that: The reflux supply portion (6) further comprises a pointed protrusion (69) mounted on the bottom of the second water tank (65); The pointed protrusion (69) is close to the fan (62); A plurality of holes (511) are arranged in an array on the L-shaped load-bearing platform (51) at a position directly below the fan (62).

6. A cooling device for a laser 3D printer as claimed in claim 5, characterized in that: The heat transfer circulation part (5) further comprises two sets of brackets (58) of different numbers installed on both sides of the lifting platform (2), and two sleeves (59) installed on the inner side wall of the 3D printer body (1); A portion of the internal delivery pipe (55) and the return pipe (57) are respectively embedded in two groups of brackets (58) of different numbers; The two sleeves (59) are respectively sleeved on the inner delivery pipe (55) and the return pipe (57); A section of the internal delivery pipe (55) and the return pipe (57) close to the two sleeves (59) is in a winding shape.

7. A cooling device for a laser 3D printer as claimed in claim 6, characterized in that: The two overhead blocks (41), the outer conductive cover (42), the main pipe (56) and the second water tank (65) are made of copper.

8. A cooling device for a laser 3D printer as claimed in claim 7, characterized in that: An inner filling port (531) is provided at the top of the first water tank (53).

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