3D printing equipment

Abstract

This utility model discloses a 3D printing device, including a base; a receiving tank connected to the base, the receiving tank defining a cavity for containing resin; a printing platform connected to the base and located within the cavity, the printing platform being able to move up and down within the cavity; and a filling device including a capsule and a first one-way valve, the capsule being disposed within the cavity and used to contain a medium, the capsule having a first opening, the first one-way valve communicating with the first opening and being able to open when the pressure within the capsule exceeds a first set pressure; wherein, the printing platform is configured to squeeze the capsule when descending within the cavity, so that the medium within the capsule flows out unidirectionally from the first opening. The capsule can occupy space within the receiving tank, thereby reducing the amount of resin required for the liquid level in the receiving tank to reach a set height, and thus reducing resin loss when the receiving tank is emptied.

Description

Technical Field

[0001] This utility model relates to the field of 3D printing technology, and in particular to a 3D printing device. Background Technology

[0002] 3D printing technology, as an additive manufacturing process, is widely used in the manufacturing industry. There are several technical approaches to 3D printing, one of which involves using a light source to cure photosensitive resin layer by layer to form a workpiece. This requires a resin tank to hold the resin. For equipment designed for printing large workpieces, especially taller ones, maintaining a high resin level in the tank requires a large amount of resin. This leads to resin waste when the tank needs to be emptied later (e.g., during machine shutdown). Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a 3D printing device that can reduce resin consumption.

[0004] The 3D printing apparatus according to a first aspect of the present invention includes:

[0005] Base;

[0006] A receiving groove, connected to the base, defines a cavity for receiving resin;

[0007] A printing platform is connected to the base and located within the cavity; the printing platform is capable of moving up and down within the cavity.

[0008] A filling device includes a bladder and a first one-way valve. The bladder is disposed in the cavity and is used to contain a medium. The bladder has a first opening. The first one-way valve is connected to the first opening and can be opened when the pressure in the bladder is greater than a first set pressure.

[0009] The printing platform is configured to compress the capsule as it descends within the cavity, causing the medium within the capsule to flow out unidirectionally from the first opening.

[0010] The 3D printing equipment according to the embodiments of the present invention has at least the following beneficial effects:

[0011] The capsule occupies space within the receiving tank, thereby reducing the amount of resin required to reach the set liquid level in the tank, and consequently reducing resin loss when the tank is emptied. On the other hand, the printing platform gradually descends during printing, and the formed portion of the workpiece is immersed in resin, occupying a certain volume. In this embodiment, the printing platform is configured to squeeze the capsule as it descends within the cavity, causing the medium within the capsule to flow out unidirectionally from the first opening, thus reducing its volume. This prevents the liquid level from rising as the workpiece continues to descend and also reduces the resistance encountered by the printing platform during its descent. Furthermore, in this embodiment, the capsule discharges the medium through the squeezing action of the printing platform, eliminating the need for a separate medium discharge device such as an air pump. The first one-way valve also requires no additional control, simplifying the structure and reducing costs.

[0012] In other embodiments of this utility model, the bladder also has a second opening, and the filling device further includes a second one-way valve, which is connected to the second opening. The second one-way valve can be opened when the external pressure is greater than a second set pressure, so as to allow the medium to flow in unidirectionally from the second opening.

[0013] In other embodiments of this utility model, the first opening and the second opening are the same opening.

[0014] In other embodiments of the present invention, the 3D printing equipment further includes a media injection device, which is connected to a second opening. When the printing platform is detached from the capsule, the media injection device is configured to inject the media into the capsule through the second opening.

[0015] In other embodiments of this utility model, the capsule further has a second opening, and the filling device further includes a control valve, which is connected to the second opening and has an open state to open the second opening and a closed state to close the second opening. When the control valve is in the open state, the medium can flow into the capsule through the second opening.

[0016] In other embodiments of this utility model, the printing platform has an initial position, the printing platform in the initial position is spaced apart from the capsule, and the printing platform is configured to squeeze the capsule after descending a predetermined distance from the initial position.

[0017] In other embodiments of the present invention, the printing platform further includes a compression device. The printing platform has multiple through holes. The compression device includes a compression member connected to the lower side of the printing platform and moving synchronously with the printing platform. The printing platform is configured to compress the capsule by the compression member.

[0018] In other embodiments of this utility model, the 3D printing equipment further includes a guiding device, which includes guide rods distributed on opposite sides of the receiving groove. The guide rods are arranged in a vertical direction, and both ends of the extrusion device are slidably connected to the guide rods on both sides.

[0019] In other embodiments of this utility model, the extrusion device further includes a connector. The extrusion member is arranged in a horizontal direction, with both ends of the extrusion member extending from below the printing platform. The connector is arranged in a vertical direction, with one end connected to the extended end of the extrusion member and the other end extending from the cavity and slidably connected to the guide rod.

[0020] In other embodiments of this utility model, the filling device further includes a first pipe, and the first one-way valve is connected to the first opening through the first pipe;

[0021] The first conduit is fixedly connected to the receiving groove and / or the base to limit the displacement of the bladder within the cavity;

[0022] And / or, the first one-way valve is fixedly connected to the receiving groove and / or the base to limit the displacement of the bladder within the cavity.

[0023] In other embodiments of this utility model, the base has a mounting surface, the first pipe includes a first pipe segment and a second pipe segment, the first pipe segment is located inside the cavity and communicates with the first opening, the second pipe segment is located outside the cavity and communicates with the first one-way valve, wherein the 3D printing equipment includes at least one of the following:

[0024] The first pipe section is fixedly connected to the inner wall of the cavity;

[0025] The second pipe section is fixedly connected to the mounting surface;

[0026] The first one-way valve is fixedly connected to the mounting surface.

[0027] In other embodiments of this utility model, the bladder also has a second opening, and the filling device further includes a second pipe and a second one-way valve. The second one-way valve is connected to the second opening through the second pipe. The second one-way valve can be opened when the external pressure is greater than the second set pressure, so as to allow the medium to flow in unidirectionally from the second opening.

[0028] Wherein, the second pipe is fixedly connected to the receiving groove and / or the base, and / or the second check valve is fixedly connected to the receiving groove and / or the base, and the first pipe and the first check valve are located on the first side of the receiving groove, and the second pipe and the second check valve are located on the second side of the receiving groove, with the first side and the second side being arranged opposite to each other.

[0029] In other embodiments of this utility model, the 3D printing equipment further includes a limiting device connected to the receiving groove and located within the cavity. The limiting device is located on the upper side of the capsule, wherein the projection of the limiting device on the horizontal projection plane coincides with the projection of the capsule on the horizontal projection plane, so that the limiting device can abut against the capsule to limit the displacement of the capsule. The projection of the limiting device on the horizontal projection plane is located outside the projection of the printing platform on the horizontal projection plane, so that the printing platform can pass over the limiting device and squeeze the capsule.

[0030] In other embodiments of this utility model, the volume of the capsule is equal to or less than 50% of the volume of the receiving groove.

[0031] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0033] Figure 1 This is a three-dimensional schematic diagram of the 3D printing equipment in the embodiments of this utility model;

[0034] Figure 2 for Figure 1 3D diagram of a 3D printing equipment with a hidden printing platform

[0035] Figure 3 for Figure 1 A cross-sectional view of a 3D printing device in China;

[0036] Figure 4 for Figure 1 A three-dimensional schematic diagram of the capsule of the 3D printing equipment;

[0037] Figure 5 for Figure 1 A three-dimensional schematic diagram of the printing platform and the corresponding first driving device of the 3D printing equipment;

[0038] Figure 6 This is a schematic diagram illustrating the limitation of the bladder body by a one-way valve and a pipeline in another embodiment of the present invention;

[0039] Figure 7 This is a schematic diagram of the limiting device used to limit the position of the bladder in another embodiment of the present invention.

[0040] Figure label:

[0041] 3D printing equipment 10;

[0042] Base 100, mounting surface 101;

[0043] Receiving groove 200, cavity 201;

[0044] Printing platform 300, through hole 301;

[0045] The filling device 400, the first one-way valve 410, the second one-way valve 420, the first pipe 430, the first pipe section 431, the second pipe section 432, the second pipe 440, the bladder 450, the first opening 451, and the second opening 452;

[0046] Extrusion device 500, extruded part 510, connecting part 520;

[0047] Guide device 600, guide rod 610;

[0048] Limit device 700;

[0049] Light source module 800;

[0050] First drive unit 900;

[0051] Second drive unit 1000. Detailed Implementation

[0052] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0053] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0054] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0055] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0056] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0057] To facilitate understanding, we will first take DLP printing (Digital Light Processing) as an example to illustrate the working principle of 3D printing equipment based on photosensitive resin. Photosensitive resin is a resin that is initially liquid and can be cured under specific light. During printing, the printing platform used to support the workpiece is immersed to a certain depth below the surface of the liquid resin, and the surface of the liquid resin is leveled by a scraper. Then, the resin in the target area on the printing platform is cured by a light source to obtain a structural layer. Then, the printing platform is lowered again so that the obtained structural layer is immersed to the same depth below the surface of the liquid resin. After leveling the resin, it is cured by a light source to form a new structural layer on the existing structural layer. Repeating the above actions completes the 3D printing.

[0058] As mentioned earlier, during the printing process, the printing platform needs to gradually descend to ensure that the formed structural layers remain submerged below the liquid surface. That is, the descent stroke of the printing platform needs to be greater than the total height of the workpiece. Correspondingly, the depth of the receiving tank needs to be greater than the stroke of the printing platform. Therefore, for larger workpieces, especially those with greater height, the receiving tank needs sufficient depth. However, the deeper the receiving tank, the larger the volume, and the more resin is required to fill it. This leads to resin waste when the receiving tank needs to be emptied later (e.g., during machine shutdown). Based on the above, this utility model embodiment proposes a 3D printing device 10 that can reduce resin waste. The following description, in conjunction with the accompanying drawings and specific embodiments, will illustrate this.

[0059] It should be noted that the 3D printing equipment of this invention can be applied to manufacturing and industrial fields, medical and technological fields, etc. Specifically, for example, the 3D printing equipment of this invention can be used to print samples required in the research and development of storage modules and mobile storage, as well as to manufacture device samples integrating storage modules and mobile storage functions, etc. This is only an example and does not represent all application scenarios.

[0060] Reference Figure 1 , Figure 2 The 3D printing equipment 10 in the first embodiment of this utility model includes a base 100, a receiving groove 200, a printing platform 300, and a filling device 400. In addition, the 3D printing equipment 10 further includes a light source module 800 and a scraper module. The base 100 serves as a supporting structure, directly or indirectly connecting the aforementioned receiving groove 200, printing platform 300, scraper module, and light source module 800. The receiving groove 200 is used to hold resin. The printing platform 300 is used to support the intermediate structural layer during the molding process and to support the workpiece after printing. The scraper module is used to level the resin horizontally. The light source module 800 is used to cure the resin. Furthermore, the 3D printing equipment may also include a drive module for driving the movement of the corresponding modules.

[0061] For example, the base 100 includes a ring-shaped worktable and a support frame disposed under the worktable for support. The mounting surface 101 of the worktable is used to connect other modules. The receiving slot 200 is located within the space defined by the worktable and has a cavity 201 for receiving resin. The upper side of the cavity 201 has an opening to facilitate the downward projection of curing light by a light source and to facilitate the removal of the workpiece from the printing platform 300.

[0062] The printing platform 300 is connected to the base 100 and located within the cavity 201. Driven by the first driving device 900, it can move up and down within the cavity 201. Specifically, during the printing process, the printing platform 300 can gradually descend to maintain a certain depth of liquid resin on the upper side of the printed structural layer, facilitating subsequent curing operations. After printing is completed, the printing platform 300 can rise again, allowing the workpiece to detach from the resin. For example, the printing platform 300 is constructed as a rectangular platform adapted to the shape of the cavity 201.

[0063] The scraper module is connected to the base 100 and can move relative to the printing platform 300. During movement, it scrapes the resin to improve the smoothness of the resin surface and break the surface tension of the resin, thereby ensuring the subsequent curing effect. It should be noted that the height of the scraper module can be set according to the height of the resin surface in the cavity 201.

[0064] The light source module 800 is used to cure the resin that has been scraped and leveled on the printing platform 300 to obtain a structural layer. Exemplarily, the light source module 800 is a DLP light source suitable for DLP processes, capable of emitting ultraviolet light of a specific wavelength to cure the photosensitive resin. Furthermore, the light source module 800 can project a digital image converted from model data onto the resin surface in a full-layer projection, thereby simultaneously curing the resin within the area. In addition, the light source module 800 in this embodiment can also move relative to the printing platform 300, thereby curing resin over a larger area, thus adapting to the printing of large-sized workpieces.

[0065] The drive module includes a first drive device 900 for driving the printing platform 300 to rise and fall. The first drive device 900 can be a power component based on a motor-lead screw, specifically including a motor, a lead screw and a lead screw seat. The drive shaft of the motor is connected to the lead screw. The lead screw is rotatably connected to the base 100 and extends along the moving direction. The lead screw seat is threaded to the lead screw. The printing platform 300 is directly or indirectly connected to the lead screw seat. When the lead screw rotates, the lead screw seat drives the printing platform 300 to move in the vertical direction.

[0066] In addition, the drive module may also include a second drive device 1000 for driving the light source module 800 to move in a first horizontal direction, so that the light source module 800 can perform large-format printing by moving along the first horizontal direction.

[0067] Reference Figure 2 and Figure 3 , Figure 2 exist Figure 1 The printing platform 300 is hidden on the basis of this. Figure 3 for Figure 1As shown in the cross-sectional view, the filling device 400 includes a capsule 450, which is disposed within the cavity 201 and used to contain the medium. When the medium is injected into the capsule 450, the capsule 450 expands, increasing its volume; when the medium is discharged from the capsule 450, the capsule 450 contracts, decreasing its volume. The capsule 450 can occupy space within the containing tank 200, thereby reducing the amount of resin required to reach the set height of the liquid level in the containing tank 200, and thus reducing resin loss when the containing tank 200 is emptied. It should be noted that the medium can be either gas or liquid; the following explanation will use gas as an example.

[0068] On the other hand, as mentioned above, the printing platform 300 gradually descends during the printing process, and the formed part of the workpiece is immersed in the resin, thus occupying a certain volume. Therefore, in this embodiment, the printing platform 300 is configured to squeeze the capsule 450 as it descends within the cavity 201, so that the medium inside the capsule 450 flows out unidirectionally from the first opening 451, reducing its volume. This prevents the liquid level from rising as the workpiece continues to descend and also reduces the resistance encountered by the printing platform 300 during its descent. Furthermore, in this embodiment, the capsule 450 discharges the medium through the squeezing action of the printing platform 300, eliminating the need for a separate medium discharge device such as an air pump. The first one-way valve 410 also requires no additional control, which helps to simplify the structure and reduce costs.

[0069] To achieve passive venting of the bladder 450, refer to Figure 4 The filling device 400 also includes a first one-way valve 410. The bladder 450 has a first opening 451. The first one-way valve 410 is connected to the first opening 451. The first one-way valve 410 can prevent external media from being injected into the first opening 451 and can open when the pressure inside the bladder 450 is greater than a first set pressure, thereby allowing the media to flow out unidirectionally from the first opening 451. Thus, when the printing platform 300 does not squeeze the bladder 450, the first one-way valve 410 is in a closed state, and the media can be retained inside the bladder 450. When the printing platform 300 squeezes the bladder 450, the pressure inside the bladder 450 increases, and the first one-way valve 410 opens unidirectionally, thereby allowing the media to be discharged.

[0070] Based on the first embodiment, in some embodiments of this utility model, reference is made to Figure 4 The capsule 450 also has a second opening 452, and the filling device 400 also includes a second one-way valve 420. The second one-way valve 420 is connected to the second opening 452. The second one-way valve 420 can open when the external pressure is greater than the second set pressure, so that the medium flows in unidirectionally from the second opening 452. Thus, when the printing platform 300 stops squeezing the capsule 450, the capsule 450 can be filled with medium through the second opening 452, so that the capsule 450 expands again to the set volume.

[0071] It should be noted that the first check valve 410 and the second check valve 420 can be the same check valve or different check valves, and the first set pressure and the second set pressure can be the same or different.

[0072] It should also be noted that when the medium is liquid, the 3D printing equipment 10 can also be equipped with a storage container. The liquid discharged from the capsule 450 can be recycled to the storage container, and the medium in the container can be injected back into the capsule 450, thereby realizing the recycling of the liquid.

[0073] When the capsule 450 also has a second opening 452, in some embodiments of the present invention, refer to Figure 4 The first opening 451 and the second opening 452 are the same opening, that is, the first one-way valve 410 and the second one-way valve 420 are connected to the same opening of the bladder 450, which can reduce the number of openings in the bladder 450. In addition, when the one-way valve is connected to the bladder 450 through a pipe, the number of pipes can also be reduced. For example, the first one-way valve 410 and the second one-way valve 420 are connected to the bladder 450 through the same pipe.

[0074] In some embodiments of this invention, when the capsule 450 also has a second opening 452, the 3D printing equipment 10 further includes a media injection device, which is connected to the second opening 452. Taking gas as an example, the media injection device can be an air pump. In this embodiment, after the printing platform 300 is detached from the capsule 450, the media injection device is configured to inject media into the capsule 450 through the second opening 452, thereby reducing the pressure during the media injection process. It should be noted that the media injection device can start injecting after the printing platform 300 has returned to its initial position, or it can start injecting during the resetting process of the printing platform 300.

[0075] Based on the first embodiment, in some other embodiments of the present invention, the capsule 450 further has a second opening 452, and the filling device 400 further includes a control valve, which replaces the aforementioned second one-way valve 420. The control valve is connected to the second opening 452 and has an open state (opening the second opening 452) and a closed state (closing the second opening 452). When the control valve is in the open state, the medium can flow into the capsule 450 through the second opening 452. For example, the control valve can be an electrically controlled valve.

[0076] Based on the first embodiment, in some embodiments of this utility model, the printing platform 300 has an initial position, for example... Figure 3The printing platform 300 is positioned at the top of the cavity 201. In this embodiment, the printing platform 300 and the capsule 450 are spaced apart in the initial position. The printing platform 300 is configured to compress the capsule 450 after descending a set distance from the initial position. Thus, the capsule 450 occupies a portion of the space within the cavity 201, while leaving space for sufficient resin for printing. This embodiment reduces the amount of resin required to reach the set height and avoids insufficient resin affecting printing. It should be noted that the capsule 450 is relatively low in height in this embodiment. To ensure sufficient volume, the length and / or width of the capsule 450 are relatively large. For example, the capsule 450 is flat, and the space between the capsule 450 and the printing platform 300 is used to accommodate the resin.

[0077] In other embodiments, the printing platform 300 in the initial position may also contact the capsule 450. Furthermore, the capsule 450 is relatively high, and in order to leave enough space in the receiving groove 200 to accommodate the resin, the length and / or width of the capsule 450 is relatively small. For example, the capsule 450 is configured as a column, and the space between the capsule 450 and the inner wall of the cavity 201 is used to accommodate the resin.

[0078] Based on the first embodiment, in some embodiments of this utility model, reference is made to Figure 5 The printing platform 300 has multiple through holes 301 for resin flow, reducing resistance when the printing platform 300 descends and reducing disturbance of the resin by the printing platform 300. For example, the multiple through holes 301 are arranged in a matrix and cover the entire printing platform 300.

[0079] Based on this, to avoid the capsule 450 clogging the through hole 301 during compression, in this embodiment, the printing platform 300 indirectly compresses the capsule 450 through the compression device 500, referring to... Figure 3 , Figure 5 The extrusion device 500 includes an extrusion member 510, which is connected to the lower side of the printing platform 300 and can move synchronously with the printing platform 300. The printing platform 300 is configured to extrude a capsule 450 via the extrusion member 510. For example, the extrusion member 510 is configured as an extrusion strip extending horizontally, with its lower end face higher than the lower end face of the printing platform 300. Multiple extrusion strips are arranged side-by-side to jointly extrude the capsule 450.

[0080] When the printing platform 300 indirectly compresses the capsule 450 through the compression device 500, in some embodiments of this utility model, refer to Figure 3 , Figure 5The 3D printing equipment 10 also includes a guiding device 600, which includes guide rods 610 distributed on opposite sides of the receiving groove 200. Exemplarily, the guide rods 610 are distributed along a second horizontal direction. The guide rods 610 are arranged vertically, and both ends of the extrusion device 500 are slidably connected to the guide rods 610 on both sides. Thus, the guiding device 600 can guide the movement of the extrusion device 500 from opposite sides, making the movement of the extrusion device 500 and the printing platform 300 connected to the extrusion device 500 more stable. In this embodiment, the extrusion device 500 is used to extrude the capsule 450 on one hand, and on the other hand, it can also serve as a connector to the guiding device 600, making the structure of the 3D printing equipment 10 simpler and the spatial layout more compact.

[0081] Based on this, a first driving device 900 is disposed on one side of the receiving groove 200 along the second horizontal direction and is connected to the extrusion device 500. The extrusion device 500 is connected to the printing platform 300, so that the extrusion device 500 can be driven by the first driving device 900 to raise and lower the printing platform 300. The raising and lowering of the printing platform 300 is manifested in two aspects: firstly, it gradually descends during the printing process to achieve layer-by-layer printing; secondly, it is raised after printing to at least remove the workpiece from the resin, thereby facilitating the removal of the workpiece.

[0082] In some specific embodiments, reference is made to Figure 3 , Figure 5 The extrusion device 500 also includes a connector 520. The extrusion member 510 is arranged along the second horizontal direction, and both ends of the extrusion member 510 extend from below the printing platform 300. The connector 520 is arranged in the vertical direction, with one end (e.g., the bottom end) connected to the extended end of the extrusion member 510, and the other end (e.g., the top end) extending from the cavity 201 and slidably connected to the guide rod 610. In this way, it is convenient to set the guide device 600 on the mounting surface 101 of the base 100, avoiding occupying the space inside the cavity 201.

[0083] Based on the first embodiment, in some embodiments of this utility model, reference is made to Figure 4The filling device 400 also includes a first conduit 430, through which a first one-way valve 410 communicates with a first opening 451. In this embodiment, the first conduit 430 is fixedly connected to the receiving groove 200, thereby restricting the movement of the capsule 450 within the cavity 201. It should be noted that the phrase "restricting the movement of the capsule 450 within the cavity 201" in this invention should be understood as at least restricting large-scale movement of the capsule 450 within the cavity 201. For example, when the medium is gas, the average density of the capsule 450 is relatively low, and it easily floats in resin. The limiting effect of the first conduit 430 can keep the capsule 450 approximately at the bottom of the cavity 201. In some specific embodiments, the first conduit 430 can be a rigid tube, thereby providing better limiting for the capsule 450. In some specific embodiments, the first conduit 430 can be fixedly connected to the receiving groove 200 by components such as pipe clamps.

[0084] In other embodiments, the first conduit 430 is fixedly connected to the base 100, thereby restricting the movement of the bladder 450 within the cavity 201. The specific function can be understood with reference to the foregoing embodiments.

[0085] In other embodiments, the first one-way valve 410 is fixedly connected to the receiving groove 200, thereby restricting the movement of the bladder 450 within the cavity 201. Its specific function can be understood with reference to the foregoing embodiments. In some specific embodiments, the first one-way valve 410 can be fixedly connected to the receiving groove 200 via threaded fasteners or other components.

[0086] In other embodiments, the first one-way valve 410 is fixedly connected to the base 100, thereby restricting the movement of the bladder 450 within the cavity 201. The specific function can be understood with reference to the foregoing embodiments.

[0087] It should be understood that the above solutions can be combined. For example, the first pipe 430 is fixedly connected to the receiving tank 200, and the first one-way valve 410 is fixedly connected to the base 100.

[0088] When the first one-way valve 410 is connected to the first opening 451 through the first pipe 430, in some embodiments of the present invention, the base 100 has a mounting surface 101. For example, the upper surface of the base 100 has a mounting surface 101, and the mounting surface 101 surrounds the receiving groove 200.

[0089] Reference Figure 4The first pipe 430 includes a first pipe section 431 and a second pipe section 432. The first pipe section 431 is located inside the cavity 201 and communicates with the first opening 451. The second pipe section 432 is located outside the cavity 201 and communicates with the first one-way valve 410. For example, the first pipe section 431 extends vertically and is parallel to the inner wall of the cavity 201, while the second pipe section 432 extends horizontally and is parallel to the mounting surface 101 of the base 100. Based on this, the aforementioned "first pipe 430 is fixedly connected to the receiving groove 200" specifically refers to the first pipe section 431 being fixedly connected to the inner wall of the cavity 201.

[0090] In other embodiments, the aforementioned "first pipe 430 fixedly connected to base 100" specifically refers to the second pipe section 432 being fixedly connected to mounting surface 101.

[0091] In other embodiments, the aforementioned "first check valve 410 fixedly connected to base 100" specifically refers to the first check valve 410 being fixedly connected to the mounting surface 101 of base 100.

[0092] It should be understood that the above solutions can be combined. For example, the first pipe section 431 is fixedly connected to the inner wall of the cavity 201, and the first one-way valve 410 is fixedly connected to the mounting surface 101 of the base 100.

[0093] When the first one-way valve 410 is connected to the first opening 451 through the first pipe 430, in some embodiments of this utility model, refer to Figure 6 The capsule 450 also has a second opening 452, and the filling device 400 further includes a second conduit 440 and a second check valve 420. The second check valve 420 is connected to the second opening 452 through the second conduit 440 for allowing the medium to flow in unidirectionally from the second opening 452.

[0094] In some embodiments, the second pipe 440 is fixedly connected to the receiving groove 200. In other embodiments, the second pipe 440 is fixedly connected to the base 100. In other embodiments, the second one-way valve 420 is fixedly connected to the receiving groove 200. In still other embodiments, the second one-way valve 420 is fixedly connected to the base 100. The fixed connection method between the second pipe 440 and the second one-way valve 420 can be understood with reference to the connection method between the first pipe 430 and the first one-way valve 410.

[0095] Based on this, the first pipe 430 and the first check valve 410 are located on the first side of the receiving groove 200, and the second pipe 440 and the second check valve 420 are located on the second side of the receiving groove 200. The first side and the second side are arranged opposite to each other. For example, the first side is... Figure 6 The right side of the middle, the second side is Figure 6The left side of the plenum. By fixing it from the opposite sides of the receiving groove 200, i.e. the plenum 450, the limiting effect on the plenum 450 can be further enhanced.

[0096] Based on the first embodiment, in some embodiments of this utility model, reference is made to Figure 7 The 3D printing equipment 10 also includes a limiting device 700 connected to the receiving groove 200 and located within the cavity 201. The limiting device 700 is located above the capsule 450, wherein the projection of the limiting device 700 on the horizontal projection plane coincides with the projection of the capsule 450 on the horizontal projection plane, so that the limiting device 700 can abut against the capsule 450 to limit the displacement of the capsule 450. Figure 7 Taking the limiting device 700 on the left side as an example, its... Figure 7 The limiting device 700 extends left and right, and its extension length is greater than the distance between the left side of the bladder 450 and the left cavity wall of the cavity 201, allowing the limiting device 700 to abut against the upper surface of the bladder 450, thereby restricting the upward movement of the bladder 450. The limiting device 700 can be single or multiple, such as... Figure 7 As shown, limit devices 700 are provided on both sides of the cavity wall of the cavity 201.

[0097] On the other hand, the projection of the limiting device 700 on the horizontal projection plane is outside the projection of the printing platform 300 on the horizontal projection plane, so that the printing platform 300 can pass over the limiting device 700 and squeeze the capsule 450. Figure 7 Taking the limiting device 700 on the left side as an example, its... Figure 7 The limiting device 700 is extended in the left and right directions, and the extension length of the limiting device 700 is less than the distance between the left side of the printing platform 300 and the left cavity wall of the cavity 201, so that the lifting and lowering of the printing platform 300 will not be hindered by the limiting device 700.

[0098] Based on the first embodiment, in some embodiments of this utility model, the volume of the capsule 450 is equal to or less than 50% of the volume of the receiving groove 200. In this way, the capsule 450 can occupy part of the space of the cavity 201 while leaving enough space to accommodate the resin, which facilitates the normal operation of the printing work.

[0099] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A 3D printing device, characterized by include: Base; A receiving groove, connected to the base, defines a cavity for receiving resin; A printing platform is connected to the base and located within the cavity; the printing platform is capable of moving up and down within the cavity. A filling device includes a bladder and a first one-way valve. The bladder is disposed in the cavity and is used to contain a medium. The bladder has a first opening. The first one-way valve is connected to the first opening and can be opened when the pressure in the bladder is greater than a first set pressure. The printing platform is configured to compress the capsule as it descends within the cavity, causing the medium within the capsule to flow out unidirectionally from the first opening.

2. The 3D printing device of claim 1, wherein, The bladder also has a second opening, and the filling device further includes a second one-way valve, which is connected to the second opening. The second one-way valve can be opened when the external pressure is greater than a second set pressure, so as to allow the medium to flow in unidirectionally from the second opening.

3. The 3D printing device of claim 2, wherein, The first opening and the second opening are the same opening.

4. The 3D printing device of claim 2, wherein, The 3D printing equipment also includes a media injection device, which is connected to a second opening. When the printing platform is detached from the capsule, the media injection device is configured to inject the media into the capsule through the second opening.

5. The 3D printing device of claim 1, wherein, The capsule also has a second opening, and the filling device further includes a control valve that communicates with the second opening. The control valve has an open state that opens the second opening and a closed state that closes the second opening. When the control valve is in the open state, the medium can flow into the capsule through the second opening.

6. The 3D printing device of claim 1, wherein, The printing platform has an initial position, and the printing platform in the initial position is spaced apart from the capsule. The printing platform is configured to squeeze the capsule after descending a predetermined distance from the initial position.

7. The 3D printing device of claim 1, wherein, The printing platform also includes a compression device. The printing platform has multiple through holes. The compression device includes a compression member connected to the lower side of the printing platform and moving synchronously with the printing platform. The printing platform is configured to compress the capsule through the compression member.

8. The 3D printing device of claim 7, wherein, The 3D printing equipment also includes a guiding device, which includes guide rods distributed on opposite sides of the receiving groove. The guide rods are arranged in a vertical direction, and both ends of the extrusion device are slidably connected to the guide rods on both sides.

9. The 3D printing device of claim 8, wherein, The extrusion device further includes a connector. The extrusion member is arranged horizontally, with both ends extending from below the printing platform. The connector is arranged vertically, with one end connected to the extended end of the extrusion member and the other end extending from the cavity and slidably connected to the guide rod.

10. The 3D printing device of claim 1, wherein, The filling device further includes a first pipe, and the first one-way valve is connected to the first opening through the first pipe; The first conduit is fixedly connected to the receiving groove and / or the base to limit the displacement of the bladder within the cavity; And / or, the first one-way valve is fixedly connected to the receiving groove and / or the base to limit the displacement of the bladder within the cavity.

11. The 3D printing device of claim 10, wherein, The base has a mounting surface. The first pipe includes a first pipe section and a second pipe section. The first pipe section is located inside the cavity and communicates with the first opening. The second pipe section is located outside the cavity and communicates with the first one-way valve. The 3D printing equipment includes at least one of the following solutions: The first pipe section is fixedly connected to the inner wall of the cavity; The second pipe section is fixedly connected to the mounting surface; The first one-way valve is fixedly connected to the mounting surface.

12. The 3D printing equipment according to claim 10, characterized in that, The bladder also has a second opening, and the filling device further includes a second pipe and a second one-way valve. The second one-way valve is connected to the second opening through the second pipe. The second one-way valve can be opened when the external pressure is greater than the second set pressure, so as to allow the medium to flow in unidirectionally from the second opening. Wherein, the second pipe is fixedly connected to the receiving groove and / or the base, and / or the second check valve is fixedly connected to the receiving groove and / or the base, and the first pipe and the first check valve are located on the first side of the receiving groove, and the second pipe and the second check valve are located on the second side of the receiving groove, with the first side and the second side being arranged opposite to each other.

13. The 3D printing device of claim 1, wherein, The 3D printing equipment further includes a limiting device connected to the receiving groove and located within the cavity. The limiting device is located on the upper side of the capsule, wherein the projection of the limiting device on the horizontal projection plane coincides with the projection of the capsule on the horizontal projection plane, so that the limiting device can abut against the capsule to limit the displacement of the capsule. The projection of the limiting device on the horizontal projection plane is located outside the projection of the printing platform on the horizontal projection plane, so that the printing platform can pass over the limiting device and squeeze the capsule.

14. The 3D printing device of claim 1, wherein, The volume of the capsule is equal to or less than 50% of the volume of the receiving groove.

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