3D printing device

Abstract

The utility model discloses a 3D (three-dimensional) printing device which comprises a light source mechanism with a printing screen arranged on the top side; the material box is connected to the top side of the light source mechanism, a material cavity is formed between the material box and the top side of the light source mechanism, and a material hole and an air hole which are communicated with the material cavity are formed in the outer side of the material box; the printing platform is located in the material cavity; the position adjusting mechanisms are arranged on the top side of the material box, each position adjusting mechanism is provided with a movable end capable of moving up and down in the material cavity, the number of the position adjusting mechanisms is multiple, and the movable ends are connected to the printing platform through spherical hinges. And the assembled printing platform can be directly leveled, the whole device does not need to be disassembled, assembled and adjusted, and the 3D printing quality and efficiency are improved.

Description

Technical Field

[0001] The utility model relates to an additive manufacturing device, in particular to a 3D printing device. Background Art

[0002] According to different forming principles, there are various 3D printing devices. In the current space environment, if 3D printing is required, the fused deposition modeling technology is usually adopted. When the parts of the instruments in the space station are damaged and cannot be replenished in time, 3D printing can be used for temporary replenishment. The fused deposition modeling technology is relatively simple and low-cost, but the printing accuracy is low, the operation is cumbersome, the error is large, and it is difficult to meet the requirements of simple and fast printing and high precision in space. Stereolithography 3D printing has the advantages of high precision and good surface quality, but it is currently difficult to achieve stereolithography 3D printing in space. The space environment is a microgravity environment, making it inconvenient for users to move. It is difficult to quickly assemble and operate a stereolithography printer. There are large assembly errors after the entire device is assembled, resulting in a large deviation in the position of the stereolithography platform in the device, affecting the 3D printing forming quality. Therefore, there is an urgent need for a 3D printing device that can conveniently adjust the position of the stereolithography platform. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a 3D printing device to solve one or more technical problems in the prior art, and at least provide a beneficial choice or create conditions.

[0004] The solution of the utility model to solve its technical problems is:

[0005] A 3D printing device includes: a light source mechanism with a printing screen arranged on the top side; a material box connected to the top side of the light source mechanism, a material cavity is formed between the material box and the top side of the light source mechanism, and a material hole and an air hole communicating with the material cavity are arranged on the outer side of the material box; a printing platform located in the material cavity; an adjustment mechanism arranged on the top side of the material box, the adjustment mechanism has a movable end that can move up and down in the material cavity, the number of the adjustment mechanisms is multiple, and the multiple movable ends are respectively connected to the printing platform through spherical hinges.

[0006] The technical solution has at least the following beneficial effects: Before work, the movable ends of multiple position adjustment mechanisms drive different positions of multiple printing platforms to move up and down respectively, so as to adjust the position and posture of the printing platform, make the printing platform parallel to the printing screen, and the multiple position adjustment mechanisms provide a driving force for the printing platform to move closer to or away from the printing screen. During work, resin is injected into the material box from the material hole, and air in the material cavity is discharged at the air hole. The light source mechanism irradiates the pattern to be formed from the printing screen, and cures the resin located between the printing screen and the printing platform by light. As the printing platform is gradually moved away from the printing screen, a product is gradually formed between the printing screen and the printing platform. In this way, a relatively closed material cavity is provided, which can be conveniently applied to different environments, such as space, and the printing platform after assembly can be directly leveled without disassembling and adjusting the entire device, improving the quality and efficiency of 3D printing.

[0007] As a further improvement of the above technical solution, the position adjustment mechanism includes a motor, a transmission wheel and an adjustment screw. The motor is connected to the top side of the material box. The transmission wheel is rotatably connected to the top side of the material box along the axis in the up and down direction. The motor is drivingly connected to the transmission wheel. The adjustment screw is slidably connected to the top side of the material box along the up and down direction. The adjustment screw passes through the transmission wheel and is threadedly connected to the transmission wheel. The bottom end of the adjustment screw is the movable end. The motor provides a driving force for the rotation of the transmission wheel. When it is necessary to adjust the position of the printing platform connected to the bottom end of the adjustment screw upward, the motor is rotated forward. Since the adjustment screw is threadedly connected to the transmission wheel and there is a sliding connection limit between the adjustment screw and the material box, when the transmission wheel is driven to rotate, the adjustment screw can be driven to move upward, so as to adjust the position and posture of the printing platform or drive the whole printing platform to move upward. Similarly, when it is necessary to adjust the position of the printing platform connected to the bottom end of the adjustment screw downward, the motor is rotated reversely, and the adjustment screw can be driven to move downward through the transmission wheel, so as to adjust the position and posture of the printing platform or drive the whole printing platform to move downward.

[0008] As a further improvement of the above technical solution, the motor is drivingly connected with a torque sensor. When the printing platform is offset relative to the printing screen, after the printing platform is moved down in place, there is a situation where a certain position of the printing platform collides with the printing screen. At this time, the printing platform is blocked, and the blocking pressure is transmitted to the motor through the adjustment screw and the transmission wheel, causing a change in the torque of the motor. At this time, it can be detected by the torque sensor, so as to facilitate the control of the motor activity at the location. When the printing platform is close to the printing screen, the torque values measured by the torque sensors at multiple positions are the same or within the allowable error value, and it can be determined that the position adjustment of the printing platform is completed. In this way, the position and posture of the printing platform can be conveniently adjusted.

[0009] As a further improvement of the above technical solution, the light source mechanism includes a bottom case, a condenser cover and a light source. The condenser cover is connected inside the bottom case. The condenser cover surrounds and forms a condenser groove with an upward opening. The light source is located in the condenser groove. The printing screen is connected to the top side of the condenser cover. The material box is connected to the top side of the bottom case. A material cavity is formed between the material box and the top side of the bottom case. The bottom case is connected to the bottom side of the material box. During overall assembly, the material box and the bottom case are connected to each other. During operation, the light source emits light. The condenser cover is used to gather the light and emit it upward. The required pattern is projected through the printing screen, so as to continue to cure and form the resin on the bottom side of the printing platform or the cured resin.

[0010] As a further improvement of the above technical solution, a release film is provided on the top side of the printing screen. The release film itself is a transparent soft film material. Setting it on the top side of the printing screen can prevent the printing screen from directly contacting the resin, thus effectively reducing the corrosion or damage of the printing screen. And the release film can be used to assist in peeling the printed object from the printing screen, reducing the pause time during printing, thereby reducing the pause time during printing and improving the overall printing efficiency.

[0011] As a further improvement of the above technical solution, the material box and the bottom case are detachably connected. The material box and the bottom case can be disassembled and assembled, which is convenient for maintaining structural components such as the inside of the material box or the printing screen.

[0012] As a further improvement of the above technical solution, the material box includes an outer peripheral plate and a top cover. The top cover is detachably connected to the top side of the outer peripheral plate. The position adjustment mechanism is arranged on the top side of the top cover. A material cavity is formed between the top cover, the outer peripheral plate and the top side of the light source mechanism. The material box includes an outer peripheral plate mainly used to enclose the inner wall of the material cavity. The top side of the outer peripheral plate is detachably connected to the top cover, which is convenient to open the opening above the material cavity for internal maintenance, or to disassemble and maintain the position adjustment mechanism, improving the usability.

[0013] As a further improvement of the above technical solution, a sealing ring is provided between the top cover and the outer peripheral plate. The sealing ring can strengthen the sealing performance of the connection position between the top cover and the outer peripheral plate, so as to better form a sealed space inside the material cavity and be suitable for different use environments.

[0014] As a further improvement of the above technical solution, a semiconductor refrigeration sheet is embedded in the peripheral plate, and the semiconductor refrigeration sheet is used to heat or cool the material cavity. When the temperature of the material cavity is higher than the set temperature, control the side of the semiconductor refrigeration sheet close to the material cavity to refrigerate, and the refrigeration power can be increased by increasing the current; when the temperature is lower than the set temperature, control the reverse current direction, and the side of the semiconductor refrigeration sheet close to the material cavity is used for heating. This is beneficial to control and ensure that the resin is always within the optimal working temperature range, thereby optimizing the fluidity and curing characteristics of the resin, reducing possible defects during the printing process, and improving the accuracy and surface quality of the product.

[0015] As a further improvement of the above technical solution, a plurality of air holes are arranged around the top of the material box, and a gas-liquid separator is arranged on the inner wall of the material box at the position of the plurality of air holes. When materials such as resin are input into the material cavity, air can be exhausted outward from different air holes, better meeting the requirement of quickly adding materials to the material cavity, and a gas-liquid separator is arranged at the position of the air holes to separate the injected liquid such as resin and prevent it from being discharged from the air holes. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly describe the drawings required for the description of the embodiments. Obviously, the described drawings are only a part of the embodiments of the present invention, rather than all embodiments. Those skilled in the art can also obtain other design solutions and drawings based on these drawings without creative efforts.

[0017] Figure 1 It is an overall exploded view of the present invention.

[0018] Figure 2 It is an overall assembled three-dimensional view of the present invention.

[0019] In the drawings: 110 - printing screen, 120 - bottom case, 130 - condenser cover, 140 - release film, 210 - peripheral plate, 211 - material hole, 212 - air hole, 220 - top cover, 230 - sealing ring, 300 - printing platform, 410 - motor, 420 - driving wheel, 430 - adjusting screw, 440 - torque sensor. Detailed Embodiments

[0020] The following will describe in detail the embodiments of the present invention. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0021] In the description of the present utility model, it should be understood that when it comes to orientation descriptions, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc., it is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0022] In the description of the present utility model, the meaning of several is one or more, the meaning of multiple is more than two, and understandings such as greater than, less than, exceeding, etc. do not include the present number, while understandings such as above, below, within, etc. include the present number. If there is a description of first and second, it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0023] In the description of the present utility model, unless otherwise clearly defined, words such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present utility model in combination with the specific content of the technical solution.

[0024] Referring to Figure 1 and Figure 2 , a 3D printing device includes a light source mechanism, a material box, a printing platform 300 and a position adjustment mechanism. Among them, a printing screen 110 is provided on the top side of the light source mechanism. The light source mechanism is used to cure 3D printing materials such as resin, and an ultraviolet light source can be selected. The material box is connected to the top side of the light source mechanism, and a material cavity is formed between the material box and the top side of the light source mechanism. A material hole 211 and an air hole 212 communicating with the material cavity are provided on the outer side of the material box. The printing platform 300 is located in the material cavity. The position adjustment mechanism is provided on the top side of the material box. The position adjustment mechanism has a movable end that can move up and down in the material cavity. The number of the position adjustment mechanisms is multiple, and the multiple movable ends are respectively connected to the printing platform 300 through ball joints. In practical applications, the number of the position adjustment mechanisms can be four, and the movable ends of the four position adjustment mechanisms are respectively connected to four positions near the corners of the printing platform 300. By using the movable ends of the four position adjustment mechanisms, the printing platform 300 can be moved up and down separately or simultaneously.

[0025] As can be seen from the above, before work, the movable ends of multiple position adjustment mechanisms drive different positions of multiple printing platforms 300 to move up and down respectively, so as to adjust the position and attitude of the printing platform 300, make the printing platform 300 parallel to the printing screen 110, and provide a driving force for the printing platform 300 to move closer to or away from the printing screen 110 through multiple position adjustment mechanisms. During work, resin is injected into the material box from the material hole 211, and the air in the material cavity is discharged at the air hole 212. The light source mechanism irradiates the pattern to be formed from the printing screen 110, and cures the resin located between the printing screen 110 and the printing platform 300. As the printing platform 300 is gradually moved away from the printing screen 110, a product is gradually formed between the printing screen 110 and the printing platform 300. In this way, a relatively airtight material cavity is provided, which can be conveniently applied to different environments, such as space, and the printing platform 300 after assembly can be directly leveled without disassembling and adjusting the whole device, improving the quality and efficiency of 3D printing.

[0026] The position adjustment mechanism can be in the form that the motor 410 drives a rack to move up and down through gears. At this time, the bottom end of the rack is the movable end. In order to better improve the effect of locking the position of the rack, in this embodiment, the position adjustment mechanism includes a motor 410, a transmission wheel 420 and an adjustment screw 430. The motor 410 is connected to the top side of the material box. The transmission wheel 420 is rotatably connected to the top side of the material box along the axis in the up and down direction. The motor 410 is drivingly connected to the transmission wheel 420. There are various ways to drivingly connect the motor 410 and the transmission wheel 420. For example, a first gear is connected to the output end of the motor 410, and a second gear is also coaxially arranged on the transmission wheel 420. By the mutual meshing of the first gear and the second gear, the motor 410 can drive the transmission wheel 420 to rotate. Or the output end of the motor 410 and the transmission wheel 420 are drivingly connected to each other through a worm and worm gear. The adjustment screw 430 is slidably connected to the top side of the material box along the up and down direction. The adjustment screw 430 passes through the transmission wheel 420 and is threadedly connected to the transmission wheel 420. The bottom end of the adjustment screw 430 is the movable end. The motor 410 provides a driving force for rotating the transmission wheel 420. When it is necessary to adjust the position of the printing platform 300 connected to the bottom end of the adjustment screw 430 upward, the motor 410 is rotated forward. Since the adjustment screw 430 is threadedly connected to the transmission wheel 420 and there is a sliding connection limit between the adjustment screw 430 and the material box, when the transmission wheel 420 is driven to rotate, the adjustment screw 430 can be driven to move upward, so as to adjust the position and attitude of the printing platform 300 or drive the entire printing platform 300 to move upward. Similarly, when it is necessary to adjust the position of the printing platform 300 connected to the bottom end of the adjustment screw 430 downward, the motor 410 is rotated in reverse, and the adjustment screw 430 can be driven to move downward through the transmission wheel 420, so as to adjust the position and attitude of the printing platform 300 or drive the entire printing platform 300 to move downward.

[0027] In order to better control the accuracy of the position adjustment of the printing platform 300, in this embodiment, the motor 410 is drivingly connected with a torque sensor 440. When the printing platform 300 is offset relative to the printing screen 110, after the printing platform 300 is moved down in place, there is a situation where a certain position of the printing platform 300 collides with the printing screen 110. At this time, the printing platform 300 is blocked, and the pressure of the blockage is transmitted to the motor 410 through the adjustment screw 430 and the transmission wheel 420, causing the torque of the motor 410 to change. At this time, it can be detected by the torque sensor 440, so as to facilitate the control of the activity of the motor 410 at the position. When the printing platform 300 is close to the printing screen 110, the torque values measured by the torque sensors 440 at multiple positions are the same or within the allowable error value, and it can be determined that the position adjustment of the printing platform 300 is completed. In this way, the position and attitude of the printing platform 300 can be adjusted conveniently.

[0028] In practical applications, according to the data feedback by the torque sensor 440, it can be manually controlled and adjusted, or the data of the torque sensor 440 can be analyzed by the controller of the 3D printing device itself, and then the movement of the motor 410 in each positioning mechanism is feedback-controlled, so that the data obtained by each torque sensor 440 tend to be the same.

[0029] The light source mechanism is mainly used to emit light upward from the printing screen 110 to cure the resin. In this embodiment, the light source mechanism includes a bottom shell 120, a condenser cover 130 and a light source. The condenser cover 130 is connected inside the bottom shell 120. The condenser cover 130 defines a condenser groove with an upward opening. The light source is located in the condenser groove. The printing screen 110 is connected to the top side of the condenser cover 130. The material box is connected to the top side of the bottom shell 120, and a material cavity is formed between the material box and the top side of the bottom shell 120. The bottom shell 120 is connected to the bottom side of the material box. During overall assembly, the material box and the bottom shell 120 are connected to each other. During operation, the light source emits light, and the condenser cover 130 is used to gather the light and emit it upward. After passing through the printing screen 110, the required pattern is projected, so as to continue to cure and form the resin on the bottom side of the printing platform 300 or the cured resin.

[0030] In order to reduce the influence of the resin on the printing screen 110, in this embodiment, a release film 140 is provided on the top side of the printing screen 110. In practical applications, the release film 140 is fixed on an outer frame, and the outer frame is provided with a detachably connected pressing edge. The release film 140 is pressed tightly on the outer frame through the pressing edge, so that the replacement of the release film 140 can be conveniently realized. The outer frame is installed between the bottom shell 120 and the material box, so that the release film 140 can be fixed on the printing screen 110. The release film 140 itself is a transparent soft film material. By setting it on the top side of the printing screen 110, it can prevent the printing screen 110 from directly contacting the resin, thereby effectively reducing the corrosion or damage of the printing screen 110. And the release film 140 can be used to assist in peeling the printed object from the printing screen 110, reducing the pause time during the printing process, thereby reducing the pause time during the printing process and improving the overall printing efficiency.

[0031] In some embodiments, the material box and the bottom shell 120 are detachably connected, and there are various ways of their detachable connection. For example, the material box and the bottom shell 120 are snap-connected, or a plurality of buckles are provided between the outer side of the material box and the outer side of the bottom shell 120 for connection. The material box and the bottom shell 120 can be disassembled and assembled, which is convenient for maintaining structural components such as the inside of the material box or the printing screen 110.

[0032] The material box can be an integral structure. For the convenience of internal cleaning, in this embodiment, the material box includes a peripheral plate 210 and a top cover 220. The top cover 220 is detachably connected to the top side of the peripheral plate 210. The position adjustment mechanism is arranged on the top side of the top cover 220. A material cavity is formed between the top cover 220, the peripheral plate 210 and the top side of the light source mechanism. The material box includes a peripheral plate 210 mainly used to enclose the inner wall of the material cavity. The top side of the peripheral plate 210 is detachably connected to the top cover 220, which can facilitate opening the opening above the material cavity for internal maintenance, or facilitating the removal and maintenance of the position adjustment mechanism, improving the usability of the product.

[0033] Furthermore, a sealing ring 230 is arranged between the top cover 220 and the peripheral plate 210. The sealing ring 230 can enhance the sealing performance of the connection position between the top cover 220 and the peripheral plate 210, so as to better form a sealed space inside the material cavity and be applicable to different usage environments. In practical applications, a sealing ring 230 can also be arranged between the top side of the bottom shell 120 and the bottom side of the material box, so as to enhance the connection sealing performance between the bottom shell 120 and the material box.

[0034] In order to improve the efficiency of injecting liquids such as resin into the material box, in this embodiment, a plurality of material holes 211 are arranged in a circular pattern at the bottom of the material box. When inputting materials such as resin into the material cavity, it can be input from different material holes 211. In this way, the uniformity of the distribution of materials such as resin in the material cavity can be improved, and the efficiency of filling the resin into the material cavity can be increased. In practical applications, a feed switch valve can be arranged at the material hole 211 to improve the convenience of injecting materials into the material cavity.

[0035] In space, due to the large temperature difference in the working environment, and the optimal working temperature of the photocuring resin is usually between 20°C and 30°C. Too low a temperature may increase the viscosity of the resin, resulting in poor fluidity during the printing process, while too high a temperature may cause premature curing or a decline in material properties. Therefore, in this embodiment, a semiconductor refrigeration sheet is embedded in the peripheral plate 210. The semiconductor refrigeration sheet is used to heat or cool the material cavity. Multiple semiconductor refrigeration sheets can be embedded on each side of the peripheral plate 210 respectively to improve the temperature control effect. When the temperature of the material cavity is higher than the set temperature, control the side of the semiconductor refrigeration sheet close to the material cavity to refrigerate, and the refrigeration power can be increased by increasing the current; when the temperature is lower than the set temperature, control the reverse current direction, and the side of the semiconductor refrigeration sheet close to the material cavity will heat up. This is beneficial to ensure that the resin is always within the optimal working temperature range, thereby optimizing the fluidity and curing characteristics of the resin, reducing possible defects during the printing process, and improving the accuracy and surface quality of the product. In practical applications, a radiator and a fan can also be equipped as needed to assist the semiconductor refrigeration sheet in working. Maintaining a stable temperature can prevent the photocuring resin from undergoing unnecessary chemical changes or deterioration under temperature fluctuations, making the mechanical properties (such as strength and toughness) of the product more consistent. Through precise temperature control, printing failures and defects caused by unstable temperature during the printing process are reduced, thereby reducing material waste and time loss. This helps to reduce production costs and improve the utilization rate of materials.

[0036] When injecting resin into the material cavity, it is necessary to exhaust the air in the material tank. To ensure the exhaust efficiency, in this embodiment, a plurality of air holes 212 are arranged around the top of the material tank, and a gas-liquid separator is provided on the inner wall of the material tank at the positions of the plurality of air holes 212. The gas-liquid separator is mainly used to prevent liquid from being directly discharged from the air holes 212 and can separate liquid from gas. There are various structural forms. For example, a gas-liquid separation membrane can be selected as the gas-liquid separator. When inputting materials such as resin into the material cavity, air can be exhausted outward from different air holes 212, better meeting the requirement of quickly adding materials into the material cavity. And a gas-liquid separator is provided at the position of the air holes 212, which can separate the injected liquid such as resin to prevent it from being discharged from the air holes 212. In the space microgravity environment, resins are prone to floating and moving. By evacuating the air in the material tank before printing starts and filling the material tank with liquid resin, it is beneficial to prevent resins from floating in the microgravity environment. After the resin completely fills the material tank, even in the weightless state, the resin will not float due to the presence of air, better ensuring the stability of printing and the controllability of materials, and being beneficial to avoiding the formation of bubbles or cavities during printing, ensuring the smoothness of the printing process and the integrity of the model. This method effectively prevents printing defects caused by air mixing. In practical applications, an air outlet switch valve can be provided at the air holes 212 to automatically open or close the air holes 212 through the air outlet switch valve. In addition, resin can be supplemented into the material cavity through the material hole 211 to make up for the pressure loss inside the material cavity caused by resin curing.

[0037] After the product printing is completed, the resin in the material tank can be extracted from the material hole 211, and air can be injected into the air holes 212, so that the excess resin in the material tank can be quickly discharged. This can avoid the formation of negative pressure during the resin discharge process, resulting in unsmooth discharge. By injecting air to supplement the pressure, the discharge of liquid resin can be effectively promoted. This process is beneficial to ensuring that there is no residual resin inside the box after printing, reducing the workload of cleaning and maintenance, and there is no pollution of old resin during the next printing, improving the printing quality and efficiency.

[0038] The preferred embodiments of the present invention have been specifically described above, but the present invention is not limited to the above embodiments. Those skilled in the art can make various equivalent variations or substitutions without departing from the spirit of the present invention, and these equivalent variations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A 3D printing device, characterized in that: Including: A light source mechanism, with a printing screen (110) provided on the top side; A material box, connected to the top side of the light source mechanism, a material cavity is formed between the material box and the top side of the light source mechanism, and a material hole (211) and an air hole (212) communicating with the material cavity are provided on the outer side of the material box; A printing platform (300), located in the material cavity; A position adjusting mechanism, arranged on the top side of the material box, the position adjusting mechanism has a movable end that can move up and down in the material cavity, the number of the position adjusting mechanisms is multiple, and the multiple movable ends are respectively connected to the printing platform (300) through ball joints.

2. The 3D printing device according to claim 1, characterized in that: The position adjusting mechanism includes a motor (410), a transmission wheel (420) and an adjusting screw (430), the motor (410) is connected to the top side of the material box, the transmission wheel (420) is rotatably connected to the top side of the material box along the axis in the up and down direction, the motor (410) is drivingly connected to the transmission wheel (420), the adjusting screw (430) is slidably connected to the top side of the material box along the up and down direction, the adjusting screw (430) passes through the transmission wheel (420) and is threadedly connected to the transmission wheel (420), and the bottom end of the adjusting screw (430) is the movable end.

3. A 3D printing device according to claim 2, characterized in that: The motor (410) is drivingly connected with a torque sensor (440).

4. A 3D printing device according to claim 1, characterized in that: The light source mechanism includes a bottom shell (120), a condenser cover (130) and a light source, the condenser cover (130) is connected inside the bottom shell (120), the condenser cover (130) encloses a condenser groove with an upward opening, the light source is located in the condenser groove, the printing screen (110) is connected to the top side of the condenser cover (130), the material box is connected to the top side of the bottom shell (120), and the material cavity is formed between the material box and the top side of the bottom shell (120).

5. A 3D printing device according to claim 4, characterized in that: A release film (140) is provided on the top side of the printing screen (110).

6. A 3D printing device according to claim 4, characterized in that: The material box and the bottom shell (120) are detachably connected.

7. A 3D printing device according to claim 1, characterized in that: The material box includes an outer peripheral plate (210) and a top cover (220), the top cover (220) is detachably connected to the top side of the outer peripheral plate (210), the position adjusting mechanism is arranged on the top side of the top cover (220), and the material cavity is formed among the top cover (220), the outer peripheral plate (210) and the top side of the light source mechanism.

8. A 3D printing device according to claim 7, characterized in that: A sealing ring (230) is provided between the top cover (220) and the outer peripheral plate (210).

9. A 3D printing device according to claim 7, characterized in that: A semiconductor refrigeration sheet is embedded in the outer peripheral plate (210), and the semiconductor refrigeration sheet is used for heating or cooling the material cavity.

10. A 3D printing device according to claim 1, characterized in that: A plurality of the air holes (212) are arranged in a ring around the top of the material box, and a gas-liquid separator is arranged on the inner wall of the material box at the positions of the plurality of air holes (212).

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