Multi-light-source DLP 3D printer

Abstract

The multi-light-source DLP 3D printer comprises a printing table, the upper side of the printing table is fixedly connected with a resin groove box, and the lower side of the inner wall of the printing table is fixedly connected with a plurality of projectors. According to the invention, by arranging an exhaust fan, a circulating pump, a U-shaped pipe and a semiconductor refrigeration block, different heat dissipation modes can be started as required according to different seasonal temperatures and actual temperature conditions in the equipment, and when the temperature is low in winter, simple heat dissipation is realized by combining natural ventilation with a dustproof assembly; when the temperature slightly rises, the exhaust fan can be started to strengthen air cooling and heat dissipation; under the conditions of high-temperature environments such as hot summer and the like, all the light sources are started and heating is serious, heating conditions of different degrees can be effectively coped with further through the synergistic effect of liquid cooling driven by a circulating pump, semiconductor refrigeration and other more efficient heat dissipation means, it is ensured that the internal temperature of the equipment is maintained in a proper range, and the service life of the equipment is prolonged. And the equipment performance and the printing quality are prevented from being influenced by overheating.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printers, and particularly to a multi-light-source DLP 3D printer. Background Art

[0002] A DLP 3D printer, i.e., a digital light processing 3D printer, is an additive manufacturing device that realizes 3D printing based on digital light processing technology. It mainly uses a digital micromirror device to modulate light. During printing, the light source in the projector emits light and irradiates the DMD. By controlling the state of the micromirror, a specific light pattern is projected onto the surface of the liquid photocuring resin material, enabling the resin to be selectively cured according to the preset pattern. In order to increase the forming size, some use multi-light-source devices for printing.

[0003] Chinese Patent with application number CN218095691U discloses a multi-light-source DLP 3D printer. It includes a fixed bottom plate, a vertical plate, a lifting mechanism, a suction plate, a resin tank, a projector, and a reflector. The fixed bottom plate is placed horizontally, the vertical plate is vertically fixed on the fixed bottom plate, the suction plate is fixed on the lifting mechanism, the lifting mechanism is slidably matched with the vertical surface of the vertical plate up and down, the resin tank is arranged directly below the suction plate, the projectors are symmetrically and relatively fixed on both sides of the fixed bottom plate, and reflectors are symmetrically arranged in front of the projectors; the reflector can completely reflect the light of the projector at the bottom of the resin tank. Without changing the accuracy of the printer, the present invention can form a larger-sized model in one time, meeting the needs of customers for a large-sized forming space.

[0004] The above technical solution realizes improving the accuracy and requirements for large-sized models by setting multiple projectors to work. Chinese Patent with application number CN201821449714.0 discloses a rotary DLP 3D printer, including a housing. There are handles on both sides of the housing, and heat dissipation openings are arranged at the bottom ends of the handles. The heat dissipation openings penetrate the housing, and a dust-proof device is arranged outside the heat dissipation openings. The dust-proof device includes a chain, a gear, a rotating shaft, and dust-proof blades. The dust-proof device covers the heat dissipation openings, and a knob is arranged outside the dust-proof device. The knob is fixed on the outside of the housing. By setting the dust-proof device, the problem that the heat dissipation openings of the existing DLP 3D printer are fixed, and when it is in a non-use state, dust and other impurities are very likely to enter the interior of the DLP 3D printer from the heat dissipation openings, which will affect the normal operation of the DLP 3D printer in the long run, and when the DLP 3D printer is running and printing, a large amount of heat will be generated during long-term operation, and a more powerful heat dissipation capacity is required to keep the internal temperature of the DLP 3D printer within a certain range is solved.

[0005] The above-mentioned prior art dissipates heat by adjusting the heat dissipation openings. When using a single light source, its heat dissipation openings can meet the daily heat dissipation requirements. When multiple light source devices are started simultaneously, due to the power range, the temperature in the corresponding cavity will gradually increase, and relying solely on the heat dissipation openings cannot meet the daily needs. Especially in summer, when the temperature of the device rises to a certain extent, the optical components inside and around the projector, such as reflectors and lenses, will change their shapes due to thermal expansion. The reflector may become uneven on the mirror surface, resulting in the deviation and distortion of the reflection optical path, so that the light cannot be accurately projected onto the predetermined area of the resin tank for curing, causing serious problems such as shape distortion and dimensional deviation of the printed model. The thermal deformation of the lens will affect its focusing ability, making the distribution of light in the resin tank uneven, affecting the curing effect, and the components inside the device are eroded by heat, resulting in a significant reduction in their service life, increasing the maintenance cost and replacement frequency of the device. Therefore, it is necessary to design a multi-light-source DLP 3D printer with strong practicability and good heat dissipation effect. Summary of the Invention

[0006] The purpose of the present invention is to provide a multi-light-source DLP 3D printer to solve the problems raised in the above background technology.

[0007] To solve the above technical problems, the present invention provides the following technical solutions: A multi-light-source DLP 3D printer includes a printing table, a resin tank box is fixedly connected to the upper side of the printing table, a plurality of projectors are fixedly connected to the lower side of the inner wall of the printing table, a reflector is arranged on the lower side of the inner wall of the printing table and is matched with the plurality of projectors, an air outlet is opened on one side of the inner wall of the printing table, and an exhaust fan is fixedly connected to the inner wall of the air outlet; A cooling cavity is opened inside the printing table, a circulation pump is fixedly connected to one side of the inner wall of the cooling cavity, the output end of the circulation pump is fixedly connected to a U-shaped pipe, one end of the U-shaped pipe penetrates into the inside of the printing table and extends into the inside of the cooling cavity, a liquid suction pipe is arranged at the input end of the circulation pump, a temperature reduction mechanism is arranged on one side of the printing table, and dust-proof components are arranged on one side of the printing table and the exhaust fan.

[0008] According to the above technical solution, the temperature reduction mechanism includes a hidden groove fixedly connected to one side of the printing table, a semiconductor refrigeration block fixedly connected to the inner wall of the hidden groove, a heat conduction sheet fixedly connected to one side of the semiconductor refrigeration block and extending into the inside of the cooling cavity, and a heat dissipation fan fixedly connected to the other side of the semiconductor refrigeration block.

[0009] According to the above technical solution, the dust-proof components include dust-proof nets fixedly connected to one side of the printing table and the exhaust fan, and light-shielding cloths fixedly connected to the opposite sides of the two dust-proof nets.

[0010] According to the above technical solution, a liquid viewing port is provided on one side of the cooling cavity, and a transparent plate is fixedly connected to the inner wall of the liquid viewing port.

[0011] According to the above technical solution, a liquid injection port is provided on one side of the cooling cavity above the liquid viewing port, and a sealing plug is provided on the inner wall of the liquid injection port.

[0012] According to the above technical solution, a plurality of fins are fixedly connected to the U-shaped tube.

[0013] According to the above technical solution, an induction port is provided on one side of the printing table, a temperature sensor is fixedly connected to the inner wall of the induction port, and the temperature sensor is electrically coordinated with the semiconductor refrigeration block, the exhaust fan and the circulation pump through a control panel.

[0014] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: In the present invention, by providing an exhaust fan, a circulation pump, a U-shaped tube, and a semiconductor refrigeration block, different heat dissipation methods can be enabled as needed according to different seasonal temperatures and the actual temperature inside the device. In winter when the temperature is relatively low, simple heat dissipation is achieved by relying on natural ventilation combined with a dust-proof component; when the temperature rises slightly, the exhaust fan can be started to strengthen air-cooled heat dissipation; and in high-temperature environments such as hot summer, when all multiple light sources are enabled and the heat generation is serious, more efficient heat dissipation means such as liquid cooling driven by the circulation pump and semiconductor refrigeration can be further used in cooperation to effectively cope with different degrees of heat generation, ensure that the temperature inside the device is maintained within a suitable range, and avoid affecting the performance of the device and the printing quality due to overheating. Description of the Drawings

[0015] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. In the drawings: Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the side view three-dimensional structural schematic diagram of the present invention; Figure 3 is the side view three-dimensional sectional structural schematic diagram of the present invention; Figure 4 is the overall three-dimensional sectional schematic diagram of the printing table of the present invention; In the figure: 1, printing table; 2, resin tank box; 3, projector; 4, reflector; 5, air outlet; 6, exhaust fan; 7, cooling chamber; 8, circulation pump; 9, U-shaped tube; 10, liquid suction pipe; 11, temperature reduction mechanism; 111, hidden groove; 112, semiconductor refrigeration block; 113, heat conduction sheet; 114, cooling fan; 12, dust-proof component; 121, dust-proof net; 122, light-shielding cloth; 13, liquid viewing port; 14, transparent plate; 15, liquid injection port; 16, sealing plug; 17, fin; 18, induction port; 19, temperature sensor. Detailed implementation manner

[0016] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0017] Please refer to Figures 1-4 , the present invention provides a technical solution: a multi-light-source DLP 3D printer, including a printing table 1, the inside of the printing table 1 is hollow, a printing platform is arranged on the upper side of the printing table 1, which is a prior art. A resin tank box 2 is fixedly connected to the upper side of the printing table 1, and a plurality of projectors 3 are fixedly connected to the lower side of the inner wall of the printing table 1. A reflector 4 cooperating with the plurality of projectors 3 is arranged on the lower side of the inner wall of the printing table 1. An air outlet 5 is opened on one side of the inner wall of the printing table 1, and an exhaust fan 6 is fixedly connected to the inner wall of the air outlet 5; A cooling chamber 7 is opened inside the printing table 1. A circulation pump 8 is fixedly connected to one side of the inner wall of the cooling chamber 7. The output end of the circulation pump 8 is fixedly connected to a U-shaped tube 9. One end of the U-shaped tube 9 penetrates into the inside of the printing table 1 and extends into the inside of the cooling chamber 7. A liquid suction pipe 10 is arranged at the input end of the circulation pump 8. A temperature reduction mechanism 11 is arranged on one side of the printing table 1. Dust-proof components 12 are arranged on one side of the printing table 1 and the exhaust fan 6; Please refer to Figure 3 , the temperature reduction mechanism 11 includes a hidden groove 111 fixedly connected to one side of the printing table 1, a semiconductor refrigeration block 112 fixedly connected to the inner wall of the hidden groove 111. The semiconductor refrigeration block 112 can have a refrigeration effect by the Peltier effect, which is a prior art, a heat conduction sheet 113 fixedly connected to one side of the semiconductor refrigeration block 112 and extending into the inside of the cooling chamber 7, and a cooling fan 114 fixedly connected to the other side of the semiconductor refrigeration block 112. By starting the semiconductor refrigeration block 112, the liquid inside the cooling chamber 7 can be cooled through the transmission of the heat conduction sheet 113, so that when the circulation pump 8 pumps the liquid to circulate, the temperature of the cooling can be reduced, and the heat dissipation effect can be further improved.

[0018] Please refer to Figure 4, the dust-proof component 12 includes a dust-proof net 121 fixedly connected to one side of the printing table 1 and the exhaust fan 6, and a light-shielding cloth 122 fixedly connected to the opposite sides of the two dust-proof nets 121. The dust-proof net 121, as the first line of defense of the dust-proof component 12, can effectively intercept tiny particles such as dust and debris in the external environment with its fine grid structure. The light-shielding cloth 122 can effectively block external light from entering the interior of the printing table 1, and is relatively breathable, creating a relatively stable, dark and pure light environment, ensuring that the light projected by the projector 3 can accurately act on the resin material in the resin tank according to the preset optical path, guaranteeing the accuracy and uniformity of resin curing, thereby improving the precision and quality of the printed model.

[0019] Please refer to Figure 2 , on one side of the cooling chamber 7, there is a liquid viewing port 13 and a transparent plate 14 fixedly connected to the inner wall of the liquid viewing port 13. Through the liquid viewing port 13 and the transparent plate 14, the user can directly view the liquid level height of the coolant in the cooling chamber 7.

[0020] Please refer to Figure 2 , on one side of the cooling chamber 7, there is a liquid injection port 15 located above the liquid viewing port 13. The inner wall of the liquid injection port 15 is provided with a sealing plug 16. The liquid injection port 15 provides a convenient channel for adding coolant into the cooling chamber 7. When the device is used for the first time, an appropriate amount of coolant needs to be injected into the cooling chamber 7 through the liquid injection port 15 to ensure that the liquid cooling and heat dissipation system can start and operate normally. The sealing plug 16 can be used to seal the liquid injection port 15.

[0021] Please refer to Figure 3 , a plurality of fins 17 are fixedly connected to the U-shaped tube 9. The U-shaped tube 9, as a key component in the liquid cooling and heat dissipation system of the cooling chamber 7, undertakes the important tasks of transporting the coolant and exchanging heat with the outside world. The plurality of fins 17 fixedly connected to it are to enhance the heat dissipation effect of the U-shaped tube 9. The fins 17 are usually in a thin sheet structure, and the material is generally selected from metals with good thermal conductivity, such as aluminum or copper. They are closely attached to the outer surface of the U-shaped tube 9, increasing the contact area between the U-shaped tube 9 and the surrounding air.

[0022] Please refer to Figure 3 , on one side of the printing table 1, there is an induction port 18, and a temperature sensor 19 is fixedly connected to the inner wall of the induction port 18. The temperature sensor 19 is electrically coordinated with the semiconductor refrigeration block 112, the exhaust fan 6, and the circulation pump 8 through the control panel. The temperature sensor 19 can always capture the temperature change situation inside the printing table 1, convert the temperature information into an electrical signal, provide an accurate data basis for subsequent temperature regulation, and then transmit it to the control panel. The control panel adjusts the heat dissipation intensity according to its temperature situation.

[0023] The implementation principle of this application is as follows: In daily use, when printing on a small scale, one of the projectors 3 can be activated to irradiate the reflector 4, and the light is reflected upward by the reflector 4 to solidify and print the material inside the resin tank 2. When printing a larger workpiece, the picture to be printed is transmitted in blocks to multiple projectors 3 for separate printing, and the principle is the prior art; When used in winter with relatively low temperatures, heat dissipation can be carried out naturally through the dust-proof net 121 and the air outlet 5. After using for a certain period of time, if the temperature inside the printing table 1 rises, the exhaust fan 6 inside the air outlet 5 can be started to drive the air flow inside the printing table 1, and fresh air enters from the other end inside the printing table 1 to achieve accelerated air flow and take away the temperature inside the printing table 1; When the weather temperature rises again and the temperature inside the printing table 1 cannot meet the requirements, the circulating pump 8 can be started to pump out the liquid from the inside of the liquid suction pipe 10 and then discharge it into the U-shaped pipe 9 to cool the U-shaped pipe 9. Then, when the air contacts the U-shaped pipe 9, the flowing air is cooled to achieve further heat dissipation. If all are used simultaneously in hot summer, the refrigerating surface of the semiconductor refrigeration block 112 can be used to refrigerate the heat conduction sheet 113, and the heat conduction sheet 113 cools the liquid inside the liquid suction pipe 10. Then, the low-temperature liquid is extracted through the U-shaped pipe 9 to cool the U-shaped pipe 9, and the U-shaped pipe 9 further cools the air flowing inside the printing table 1. Thus, hierarchical cooling can be achieved according to different situations, which can not only improve the heat dissipation effect but also allocate energy consumption according to the temperature.

[0024] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device.

[0025] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A multi-light-source DLP 3D printer, comprising a printing table (1), characterized in that: A resin tank box (2) is fixedly connected to the upper side of the printing table (1). A plurality of projectors (3) are fixedly connected to the lower side of the inner wall of the printing table (1). A reflecting plate (4) that cooperates with the plurality of projectors (3) is arranged on the lower side of the inner wall of the printing table (1). An air outlet (5) is formed in one side of the inner wall of the printing table (1), and an exhaust fan (6) is fixedly connected to the inner wall of the air outlet (5). A cooling cavity (7) is formed inside the printing table (1). A circulating pump (8) is fixedly connected to one side of the inner wall of the cooling cavity (7). The output end of the circulating pump (8) is fixedly connected to a U-shaped pipe (9). One end of the U-shaped pipe (9) penetrates into the inside of the printing table (1) and extends into the inside of the cooling cavity (7). A liquid suction pipe (10) is arranged at the input end of the circulating pump (8). A temperature reduction mechanism (11) is arranged on one side of the printing table (1). Dust-proof components (12) are arranged on one side of both the printing table (1) and the exhaust fan (6).

2. The multi-light-source DLP 3D printer according to claim 1, wherein: The temperature reduction mechanism (11) includes a hidden groove (111) fixedly connected to one side of the printing table (1), a semiconductor refrigeration block (112) fixedly connected to the inner wall of the hidden groove (111), a heat conduction sheet (113) fixedly connected to one side of the semiconductor refrigeration block (112) and extending into the inside of the cooling cavity (7), and a heat dissipation fan (114) fixedly connected to the other side of the semiconductor refrigeration block (112).

3. The multi-light-source DLP 3D printer according to claim 1, wherein: The dust-proof component (12) includes a dust-proof net (121) fixedly connected to one side of the printing table (the 1) and the exhaust fan (6), and a light-shielding cloth (122) fixedly connected to the opposite sides of the two dust-proof nets (121).

4. The multi-light-source DLP 3D printer according to claim 1, wherein: An observation liquid port (1) is formed in one side of the cooling cavity (7), and a transparent plate (14) is fixedly connected to the inner wall of the observation liquid port (13).

5. The multi-light-source DLP 3D printer according to claim 4, wherein: A liquid injection port (15) is formed in one side of the cooling cavity (7) above the observation liquid port (13), and a sealing plug (16) is arranged on the inner wall of the liquid injection port (15).

6. The multi-light-source DLP 3D printer according to claim 1, wherein: A plurality of fins (17) are fixedly connected to the U-shaped pipe (9).

7. The multi-light-source DLP 3D printer according to claim 2, characterized in that: An induction port (18) is formed in one side of the printing table (1), and a temperature sensor (19) is fixedly connected to the inner wall of the induction port (18). The temperature sensor (19) is electrically cooperated with the semiconductor refrigeration block (112), the exhaust fan (6), and the circulating pump (8) through a control panel.

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