A wind cooling heat dissipation structure of a 3D printing device

Abstract

The utility model belongs to DLP light solidification 3D printing technical field, and disclose a kind of air-cooled heat dissipation structure of 3D printing equipment, this structure drives external low-temperature air by first air pump, is sent into square ring air pipe through air inlet, air pipe is used to restrict airflow path, cooperate heat exchange block to realize material tank heat dissipation. Heat exchange block is composed of material tank connector and heat dissipation block, former is connected material tank bottom conduction heat by heat-conducting adhesive, the latter is with staggered inclined bar and small baffle bar S-shaped air duct is formed, and the heat exchange efficiency with airflow is enhanced. For high load scene, second air pump and pipe assembly can be enabled to form double power circulation, and the heat dissipation capacity is improved. The design of air outlet gap can use tail gas to assist cooling for air pump. The system passes through "heat collection-high efficiency conduction-forced convection" mechanism, effectively controls material tank temperature, guarantees printing quality, and is applicable to DLP light solidification 3D printer long time operation demand.

Description

Technical Field

[0001] This utility model relates to the field of DLP photopolymerization 3D printing technology, specifically to a wind-cooled heat dissipation structure for 3D printing equipment. Background Technology

[0002] With the rapid development of additive manufacturing technology, DLP (Digital Light Processing) 3D printers, with their advantages of high precision and high forming efficiency, have been widely used in high-end manufacturing fields such as aerospace, medical implants, and precision molds. Their core working principle utilizes Digital Light Processing (DLP) technology, focusing ultraviolet light of a specific pattern onto the surface of a tank containing photosensitive resin through a projection device. This causes the photosensitive material in the irradiated area to rapidly polymerize and solidify. Through layer-by-layer solidification, complex three-dimensional structures are ultimately printed. This technology far surpasses traditional FDM (Fused Deposition Modeling) equipment in terms of detail reproduction and surface finish.

[0003] However, DLP (Digital Permeation) 3D printers consistently face a key technical bottleneck during long-term continuous operation: print quality fluctuations caused by abnormally high tank temperatures. Currently, most mainstream equipment uses mercury lamps as the ultraviolet light source, which, while releasing effective ultraviolet energy, also emits significant amounts of infrared and visible light radiation. Although these non-effective wavelengths of energy do not directly participate in the curing reaction of the photosensitive resin, they continuously act on the resin tank in the form of thermal radiation.

[0004] The ink tank, as the carrier component for the photosensitive resin, is typically made of transparent quartz glass or polytetrafluoroethylene (PTFE). While its thermal conductivity is limited, its light transmittance is extremely important. After continuous printing for more than 4 hours, the accumulated radiant heat from the mercury lamp causes the ink tank temperature to gradually rise, with some models even exceeding 50°C. The optimal curing temperature range for most commercial photosensitive resins is 25-35°C. Excessive temperature can lead to a series of adverse effects: firstly, the resin viscosity decreases significantly with increasing temperature, resulting in an abnormally increased separation force between the cured layer and the bottom of the ink tank, easily causing deformation or tearing of the formed structure; secondly, high temperatures accelerate the degradation of the photosensitizer's activity, slowing down the resin curing speed and reducing cross-linking density, ultimately resulting in defects such as dimensional inaccuracies and insufficient interlayer bonding in the printed parts. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a wind-cooled heat dissipation structure for 3D printing equipment, thereby solving the problems mentioned in the background art, such as the impact of light radiation on the temperature rise of the material tank on printing quality.

[0006] To achieve the above-mentioned objectives, this utility model provides the following technical solution: a wind-cooled heat dissipation structure for a 3D printing device, including a DLP photopolymerization 3D printer, and further comprising:

[0007] A material trough, wherein a load-bearing structure is provided on the edge of the material trough and a light window is provided in the center of the material trough;

[0008] The material tray plate is a square ring and is fixedly installed above the photomechanical module inside the DLP photopolymerization 3D printer.

[0009] The material tank heat dissipation assembly includes a square annular air duct and a first air pump. The square annular air duct is fixedly installed below the material tank plate, and the first air pump is installed on one side of the square annular air duct. The DLP photopolymerization 3D printer is provided with a fixed support structure corresponding to the material tank heat dissipation assembly.

[0010] Preferably, the cross-section of the square annular duct is rectangular.

[0011] Preferably, an adjacent air inlet and an air outlet are provided at one corner of the square annular air duct. The air inlet is sealed to the output port of the first air pump, and the input port of the first air pump is connected to the outside.

[0012] Preferably, the air outlet has a notch on the side adjacent to the first air pump.

[0013] Preferably, the heat dissipation assembly of the material tank further includes four sets of heat exchange blocks. The material tank plate is provided with a first heat exchange block through hole corresponding to the heat exchange block. The top of the square annular air duct is provided with a second heat exchange block through hole corresponding to the heat exchange block. One end of the heat exchange block is tightly fitted to the bottom of the material tank. The other end of the heat exchange block passes through the first heat exchange block through hole and the second heat exchange block through hole in sequence and is placed inside the square annular air duct.

[0014] Preferably, the heat exchange block is made of either aluminum or copper. The heat exchange block includes a material trough receiving block and a heat dissipation block. The material trough receiving block is fixedly connected to the heat dissipation block, and the material trough receiving block is fixedly connected to the bottom of the material trough by thermally conductive adhesive. The heat dissipation block is placed inside the square annular air duct.

[0015] Preferably, the heat dissipation block includes multiple sets of interlaced diagonal strips and multiple sets of small baffles. The angle between the interlaced diagonal strips and the side of the material trough block is 45 degrees. The multiple sets of interlaced diagonal strips and multiple sets of small baffles are arranged in an interlaced manner to form an S-shaped air duct.

[0016] Preferably, the square annular duct is further provided with a first auxiliary pipe and a second auxiliary pipe at the diagonal position corresponding to the first air pump. The first auxiliary pipe is located at the upstream end of the second auxiliary pipe. Both the first and second auxiliary pipes are provided with electrically controlled pipeline valves. A second air pump is provided at the second auxiliary pipe. The second auxiliary pipe is sealed to the output port of the second air pump, and the input port of the second air pump is connected to the outside.

[0017] Compared with the prior art, this utility model provides a wind-cooled heat dissipation structure for 3D printing equipment, which has the following beneficial effects:

[0018] The air-cooled heat dissipation structure of this 3D printing equipment includes a square ring-shaped air duct, a heat exchange block, and a first air pump. The air pump drives high-speed airflow, and the square ring-shaped air duct constrains the airflow direction, allowing the low-temperature outside air to exchange heat with the heat exchange block. At the same time, the heat exchange block uses its high thermal conductivity to transfer heat from the material tank, achieving air-cooled cooling of the material tank. This avoids the resin material in the material tank from overheating due to light radiation, which would affect the printing quality. As a result, the equipment can operate for a long time with stable printing quality and strong practicality. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the printer of this utility model;

[0020] Figure 2 This is a schematic diagram of the material trough, material trough plate, and material trough heat dissipation assembly of this utility model;

[0021] Figure 3 This is a schematic diagram of the heat dissipation assembly for the material tank of this utility model;

[0022] Figure 4 This is a schematic diagram of the heat dissipation block structure of this utility model;

[0023] Figure 5 This is a schematic diagram of the addition of a pipe and a second air pump in this utility model.

[0024] In the diagram: 1. DLP photopolymer 3D printer; 2. Material tank; 3. Material tank mounting plate; 4. Material tank heat dissipation assembly; 5. Square ring-shaped air duct; 6. Heat exchange block; 7. First air pump; 8. Air inlet; 9. Air outlet; 10. Perforation in the first heat exchange block; 11. Perforation in the second heat exchange block; 12. Material tank connecting block; 13. Heat dissipation block; 14. Interlaced diagonal strips; 15. Small baffle; 16. First feed pipe; 17. Second feed pipe; 18. Electrically controlled pipeline valve; 19. Second air pump. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figure 1-5 This utility model provides a technical solution:

[0027] A 3D printing device with air-cooled heat dissipation structure, including a DLP photopolymerization 3D printer 1, and further comprising:

[0028] Material trough 2, with a load-bearing structure on its edge and a light window in its center;

[0029] Material tray plate 3, which is a square ring, is fixedly installed above the photomechanical module inside the DLP photopolymer 3D printer 1.

[0030] The material tank heat dissipation assembly 4 includes a square annular air duct 5 and a first air pump 7. The square annular air duct 5 is fixedly installed below the material tank plate 3, and the first air pump 7 is installed on one side of the square annular air duct 5. The DLP photopolymerization 3D printer 1 is provided with a fixed support structure corresponding to the material tank heat dissipation assembly 4.

[0031] Furthermore, the cross-section of the square annular duct 5 is rectangular. A rectangular shape facilitates fixed installation.

[0032] Furthermore, an adjacent air inlet 8 and air outlet 9 are provided at one corner of the square annular duct 5. The air inlet 8 is sealed to the output port of the first air pump 7, and the input port of the first air pump 7 is open to the outside. The connection between the air inlet 8 and the output port of the first air pump 7 adopts an active air supply method, without the use of negative pressure suction. The specific model of the first air pump 7 is not limited, and any model commonly used by those skilled in the art is applicable.

[0033] Furthermore, an opening is provided on the side of the air outlet 9 near the first air pump 7. This arrangement allows the exhaust gas from the material tank 2 to cool the first air pump 7. The heat from light radiation is minimal, and the device primarily avoids continuous heat accumulation. Even when the device is running continuously, the exhaust gas temperature rises at a low rate, which can meet the heat dissipation requirements of the first air pump 7.

[0034] Furthermore, the heat dissipation assembly 4 of the material tank also includes four sets of heat exchange blocks 6. The material tank plate 3 is provided with a first heat exchange block through hole 10 corresponding to the heat exchange block 6. The top of the square annular air duct 5 is provided with a second heat exchange block through hole 11 corresponding to the heat exchange block 6. One end of the heat exchange block 6 is tightly attached to the bottom of the material tank 2, and the other end of the heat exchange block 6 passes through the first heat exchange block through hole 10 and the second heat exchange block through hole 11 in sequence and is placed in the square annular air duct 5.

[0035] Furthermore, the heat exchange block 6 is made of either aluminum or copper. The heat exchange block 6 includes a material receiving block 12 and a heat dissipation block 13. The material receiving block 12 and the heat dissipation block 13 are fixedly connected. The material receiving block 12 is fixedly connected to the bottom of the material tank 2 using thermally conductive adhesive. The heat dissipation block 13 is placed inside the square annular duct 5. Aluminum and copper have high thermal conductivity, reasonable prices, and good mechanical properties, enabling them to quickly transfer heat from the material tank 2 to the heat dissipation block 13.

[0036] Furthermore, the heat dissipation block 13 includes multiple sets of interlaced diagonal strips 14 and multiple sets of small baffles 15. The angle between the interlaced diagonal strips 14 and the side of the material trough receiving block 12 is 45 degrees. The multiple sets of interlaced diagonal strips 14 and multiple sets of small baffles 15 are arranged in an interlaced manner to form an S-shaped air duct. The shape of the heat dissipation block 13 can effectively improve heat dissipation efficiency. Outside air is driven into the square ring-shaped air duct 5 by the first air pump 7. Most of the air will pass through the two sides of the heat dissipation block 13. The air velocity on the two sides is higher, which will generate negative pressure and draw the air at the heat dissipation block 13 to the sides. As the air at the heat dissipation block 13 is drawn away, the pressure drops. At this time, the unique air duct shape comes into play. The air drawn into the heat dissipation block 13 will only be drawn in along the staggered diagonal strips 14. That is, at the same depth, only one side draws in new air. As the depth increases, the adjacent set of staggered diagonal strips 14 changes direction and draws in new air from the other side. In this way, an ideal cycle is achieved. The air on both sides of the heat dissipation block 13 participates in mixing with the middle, and the effective amount of air for heat exchange is greatly increased, so the heat dissipation efficiency is high.

[0037] Furthermore, a first auxiliary pipe 16 and a second auxiliary pipe 17 are provided at the diagonal of the square ring duct 5 corresponding to the first air pump 7. The first auxiliary pipe 16 is located at the upstream end of the second auxiliary pipe 17. Both the first auxiliary pipe 16 and the second auxiliary pipe 17 are equipped with electrically controlled pipeline valves 18. A second air pump 19 is provided at the second auxiliary pipe 17. The output port of the second auxiliary pipe 17 and the second air pump 19 are sealed and connected. The input port of the second air pump 19 is connected to the outside. Whether to add a second set of air pumps to improve the heat dissipation effect can be selected as needed. If a second air pump 19 is added, two sets of electrically controlled pipeline valves 18 can be opened when the equipment is running, and the two sets of electrically controlled pipeline valves 18 must be closed when the second air pump 19 is not running. Since the first air pump 7 increases the pressure in the upstream pipeline of the first feed pipe 16, the first feed pipe 16 is used to discharge the air input by the first air pump 7 when the equipment is running. The air input by the second air pump 19 is affected by the pressure on both sides and is discharged from the air inlet 8 without backflow. It is equivalent to the gas supplied by each set of air pumps being responsible for half of the heat dissipation of the material tank 2, which can greatly improve the heat dissipation effect. The disadvantage is that it increases energy consumption and the installation of the first feed pipe 16, the second feed pipe 17, the electrically controlled pipeline valves 18 and the second air pump 19 affects the overall equipment volume. If the equipment space is sensitive, the second air pump 19 and other structures can be omitted. If long-term high-load use is required, it is recommended to add the second air pump 19.

[0038] Example 1: Air is driven by the first air pump 7 to enter from the air inlet 8 and exit from the air outlet 9, surrounding the entire square annular air duct 5. The air exchanges heat with the heat dissipation block 13 in the square annular air duct 5, carrying away the heat from the material tank 2 and avoiding heat accumulation that would affect the printing quality.

[0039] Example 2: Based on Example 1, a first auxiliary pipe 16, a second auxiliary pipe 17, an electrically controlled pipeline valve 18, and a second air pump 19 are added. Corresponding to the first air pump 7, air is driven by the first air pump 7 to enter from the air inlet 8 and then output from the first auxiliary pipe 16. Corresponding to the second air pump 19, air is driven by the second air pump 19 to enter from the second auxiliary pipe 17 and then output from the air outlet 9. Compared with the method in Example 1, the dual-drive method means that each air pump is responsible for half of the heat dissipation. The same air intake volume only needs to handle half of the heat in Example 1, and the heat dissipation efficiency is greatly increased.

[0040] Structural Description:

[0041] DLP photopolymer 3D printer 1: The main body of the 3D printing equipment, which is equipped with a photomechanical module and fixed support structure, etc., for installing components such as material tank 2, material tank plate 3 and material tank heat dissipation component 4, providing a basic framework for printing operations;

[0042] Material tank 2: It has a support structure on the edge and a light window in the center to hold the photosensitive resin. It is the place where the photosensitive material is cured and formed during the printing process.

[0043] Material tray plate 3: It is square ring-shaped and fixed above the photomechanical module inside the DLP photopolymer 3D printer 1. It has a first heat exchange block through hole 10 to support the material tray 2 and provide a through channel for the heat exchange block 6.

[0044] The heat dissipation assembly 4 of the material tank includes a square ring-shaped air duct 5, a first air pump 7 and four sets of heat exchange blocks 6, and some also include a first auxiliary pipe 16, a second auxiliary pipe 17, etc., which are used to cool the material tank 2 by air and maintain its suitable temperature.

[0045] Square ring-shaped air duct 5: The cross-section is rectangular, fixed below the material trough plate 3, with a second heat exchange block through hole 11 at the top, and a first auxiliary pipe 16 and a second auxiliary pipe 17 at the diagonal to constrain the airflow path and provide space for heat exchange.

[0046] Heat exchange block 6: Made of aluminum or copper, it is fixedly connected by material tank receiving block 12 and heat dissipation block 13. One end is attached to the bottom of material tank 2, and the other end is inserted into the square ring-shaped air duct 5 to conduct the heat of material tank 2 to the air duct for heat dissipation.

[0047] First air pump 7: Located on one side of the square annular air duct 5, with its output port sealed to the air inlet 8 and its input port connected to the outside, used to drive low-temperature outside air into the square annular air duct 5;

[0048] Air inlet 8: Located at one corner of the square annular duct 5, it is sealed to the output port of the first air pump 7 and serves as the channel for low-temperature outside air to enter the square annular duct 5;

[0049] Air outlet 9: Located at one corner of the square ring-shaped air duct 5 adjacent to the air inlet 8, with a notch on the side near the first air pump 7, used to exhaust the air that has completed heat exchange, and some of the exhaust gas can cool the first air pump 7.

[0050] First heat exchange block perforation 10: is formed on the material trough plate 3, corresponding to the heat exchange block 6, and is used to allow the heat exchange block 6 to pass through the material trough plate 3;

[0051] Second heat exchange block perforation 11: is opened at the top of the square annular air duct 5, corresponding to the heat exchange block 6, for the heat exchange block 6 to pass into the square annular air duct 5;

[0052] Material tank receiving block 12: A component of heat exchange block 6, which is fixedly connected to the bottom of material tank 2 by thermally conductive adhesive, and is used to conduct heat from material tank 2 to heat dissipation block 13;

[0053] Heat dissipation block 13: A component of heat exchange block 6, placed inside square annular duct 5, consisting of multiple sets of interlaced diagonal strips 14 and small baffles 15 forming an S-shaped air duct, used for heat exchange with the air inside the duct and dissipating heat;

[0054] Interlaced diagonal strips 14: form a 45-degree angle with the side of the material trough receiving block 12, and are interlaced with the small baffle strips 15 to form an S-shaped air duct, thereby enhancing the heat exchange efficiency between the heat dissipation block 13 and the air.

[0055] Small baffle 15: It is arranged in an alternating manner with the staggered diagonal strip 14 to form an S-shaped air duct. It works with the staggered diagonal strip 14 to guide airflow and improve heat exchange effect.

[0056] First auxiliary pipe 16: Located at the diagonal of the square ring duct 5 corresponding to the first air pump 7, placed at the upstream end of the second auxiliary pipe 17, and equipped with an electrically controlled pipeline valve 18, used to discharge part of the air input by the first air pump 7 during dual power circulation;

[0057] The second additional pipe 17 is located at the diagonal of the square annular duct 5 corresponding to the first air pump 7. The downstream end is equipped with a second air pump 19 and an electrically controlled pipeline valve 18, which is used to supply the air driven by the second air pump 19 into the square annular duct 5 during dual power circulation.

[0058] Electrically controlled pipeline valve 18: respectively installed on the first feed pipe 16 and the second feed pipe 17, used to control the opening and closing of these two pipelines to realize the switching between single and dual power circulation modes;

[0059] The second air pump 19 is located at the second auxiliary pipe 17. Its output port is sealed to the second auxiliary pipe 17, and its input port is connected to the outside. It starts under high load conditions and forms a dual-power cycle with the first air pump 7 to improve heat dissipation.

[0060] Working principle: The air-cooled heat dissipation structure of this 3D printing equipment achieves precise cooling of the material tank 2 through active airflow circulation and efficient heat exchange design. Its core working principle is to use a fan pump to drive the flow of low-temperature air, constrain the airflow path through the square ring-shaped air duct 5, and cooperate with the heat exchange block 6 with high thermal conductivity to quickly transfer the heat of the material tank 2 and dissipate it into the air, forming a closed-loop heat dissipation system.

[0061] The specific operation process is as follows: After the equipment is started, the first air pump 7 draws in low-temperature air from the outside and sends it into the square annular air duct 5 under positive pressure through the air inlet 8. The square annular air duct 5 adopts a rectangular cross-section design and fits tightly with the fixed structure below the material trough plate 3 to form a surrounding airflow channel. At this time, the four sets of heat exchange blocks 6 connected at the bottom of the material trough 2 by thermally conductive adhesive play a key role - the material trough receiving block 12, made of aluminum or copper, quickly conducts the heat radiation absorbed by the material trough 2 to the heat dissipation block 13 below. The heat dissipation block 13, through the S-shaped air duct formed by multiple sets of 45-degree staggered diagonal strips 14 and small baffles 15, greatly increases the contact area with the airflow.

[0062] When airflow passes through the square annular duct 5, the special structure of the heat dissipation block 13 creates a guiding effect: high-speed airflow forms a negative pressure zone when passing through both sides of the heat dissipation block 13, continuously drawing hot air from the surface of the heat dissipation block 13 into the mainstream field; simultaneously, the S-shaped duct forces the airflow to alternately change direction, allowing the low-temperature air to fully contact the surface of the heat dissipation block 13, and removing heat through convection. This design significantly increases the effective air volume participating in heat exchange, resulting in higher utilization compared to traditional straight-channel airflow. The heat-absorbing air is finally discharged from the air outlet 9, and the notch in the air outlet 9 can guide part of the exhaust airflow across the surface of the first air pump 7, using the residual heat to assist in cooling the air pump and ensure its long-term stable operation.

[0063] For high-load printing scenarios, the system can activate an enhanced cooling mode: opening the electrically controlled pipe valves 18 of the first and second feed pipes 16 and 17, and starting the second air pump 19 to form a dual-power circulation. At this time, the airflow driven by the first air pump 7 enters through the air inlet 8, passes through the square annular duct 5, and exits through the first feed pipe 16; the cool air drawn in by the second air pump 19 enters through the second feed pipe 17, handling the cooling of the other half of the duct, and is finally discharged from the air outlet 9. This dual-pump design allows each pump to handle only half of the cooling load, doubling the cooling efficiency at the same airflow, while preventing backflow through pipe pressure differences, achieving coordinated operation.

[0064] The entire heat dissipation system employs a three-stage linkage mechanism of "heat collection - efficient conduction - forced convection" to quickly control the temperature of the material tank 2 within the optimal curing range of the photosensitive resin (25-35℃). Compared to natural cooling, its heat dissipation efficiency is significantly improved. Furthermore, the modular fan configuration design allows for flexible adjustment of heat dissipation power based on printing time and ambient temperature, ensuring both cooling effectiveness and energy consumption control. This effectively solves the overheating problem of the material tank 2 during prolonged operation of the DLP photopolymer 3D printer 1.

[0065] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A wind-cooled heat dissipation structure of a 3D printing device, comprising a DLP photocuring 3D printer (1), characterized in that, Also includes: The material trough (2) has a bearing structure on its edge and a light window in its center; Material tray plate (3), the material tray plate (3) is a square ring, and the material tray plate (3) is fixedly installed above the photomechanical module inside the DLP photopolymer 3D printer (1); The material tank heat dissipation assembly (4) includes a square ring-shaped air duct (5) and a first air pump (7). The square ring-shaped air duct (5) is fixedly installed below the material tank plate (3), and the first air pump (7) is installed on one side of the square ring-shaped air duct (5). The DLP photopolymerization 3D printer (1) is provided with a fixed support structure corresponding to the material tank heat dissipation assembly (4).

2. The air-cooled heat dissipation structure of a 3D printing device according to claim 1, characterized in that, The cross-section of the square ring-shaped air duct (5) is rectangular.

3. The air-cooled heat dissipation structure of a 3D printing device according to claim 2, characterized in that, An adjacent air inlet (8) and air outlet (9) are provided at one corner of the square ring-shaped air duct (5). The air inlet (8) is sealed to the output port of the first air pump (7), and the input port of the first air pump (7) is connected to the outside.

4. The air-cooled heat dissipation structure of a 3D printing device according to claim 3, characterized in that, The air outlet (9) has a notch on the side near the first air pump (7).

5. The air-cooled heat dissipation structure of a 3D printing device according to claim 3, characterized in that, The heat dissipation assembly (4) of the material tank also includes four sets of heat exchange blocks (6). The material tank plate (3) is provided with a first heat exchange block through hole (10) corresponding to the heat exchange block (6). The top of the square annular air duct (5) is provided with a second heat exchange block through hole (11) corresponding to the heat exchange block (6). One end of the heat exchange block (6) is tightly attached to the bottom of the material tank (2). The other end of the heat exchange block (6) passes through the first heat exchange block through hole (10) and the second heat exchange block through hole (11) in sequence and is placed in the square annular air duct (5).

6. The air-cooled heat dissipation structure of a 3D printing device according to claim 5, characterized in that, The heat exchange block (6) is made of either aluminum or copper. The heat exchange block (6) includes a material trough receiving block (12) and a heat dissipation block (13). The material trough receiving block (12) and the heat dissipation block (13) are fixedly connected. The material trough receiving block (12) is fixedly connected to the bottom of the material trough (2) by thermally conductive adhesive. The heat dissipation block (13) is placed inside the square annular air duct (5).

7. The air-cooled heat dissipation structure of a 3D printing device according to claim 6, characterized in that, The heat dissipation block (13) includes multiple sets of interlaced diagonal strips (14) and multiple sets of small baffles (15). The angle between the interlaced diagonal strips (14) and the side of the material trough block (12) is 45 degrees. The multiple sets of interlaced diagonal strips (14) and multiple sets of small baffles (15) are arranged in an interlaced manner to form an S-shaped air duct.

8. The air-cooled heat dissipation structure of a 3D printing device according to claim 5, characterized in that, The square ring-shaped air duct (5) is provided with a first auxiliary pipe (16) and a second auxiliary pipe (17) at the diagonal opposite to the first air pump (7). The first auxiliary pipe (16) is located at the upstream end of the second auxiliary pipe (17). Both the first auxiliary pipe (16) and the second auxiliary pipe (17) are provided with electrically controlled pipeline valves (18). The second auxiliary pipe (17) is provided with a second air pump (19). The second auxiliary pipe (17) is sealed to the output port of the second air pump (19). The input port of the second air pump (19) is connected to the outside.

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