Trough device and 3D printer

Abstract

The utility model relates to the technical field of 3D printing, aims to solve the technical problems that when some known troughs work, the bonding reliability of a model and a forming platform is poor, and the model is not prone to being separated from a release film, and provides a trough device and a 3D printer. The trough device comprises an outer frame, a release film assembly and an air path assembly. The outer frame is provided with an inner cavity. The release film assembly comprises a release film and a sealing film, the release film and the inner cavity define a material groove, the sealing film is arranged on the side, away from the outer frame, of the release film, and the sealing film and the release film define a cavity. The air path assembly is communicated with the cavity and is configured to inflate or exhaust air in the cavity so as to change the size of the cavity and drive the release film to deform in the direction close to or away from the forming platform. The method has the beneficial effect that the printing efficiency and the printing quality are improved.

Description

Technical Field

[0001] The present application relates to the field of 3D printing technology, and more specifically, to a trough device and a 3D printer. Background Art

[0002] In existing light-curing 3D printers, the molding platform and the material tank are spaced apart. The material tank is used to hold consumables, and the model is formed between the molding platform and the release film of the material tank. During the printing process, the spacing between the molding platform and the release film is prone to unevenness, which leads to poor reliability of bonding between the model and the molding platform and difficulty in separating from the release film. Utility Model Content

[0003] The present application provides a trough device and a 3D printer to solve the technical problems that when some known troughs are working, the reliability of bonding between the model and the molding platform is poor and it is difficult to separate from the release film.

[0004] The embodiment of the present application is implemented as follows:

[0005] In a first aspect, the present application provides a trough device for being arranged on one side of a forming platform, the trough device comprising an outer frame, a release film assembly and an air circuit assembly. The outer frame is provided with an inner cavity. The release film assembly comprises a release film and a sealing film, the release film and the inner cavity enclose a trough, the sealing film is arranged on a side of the release film away from the outer frame, and the sealing film and the release film enclose a chamber. The air circuit assembly is connected to the chamber and is configured to inflate or evacuate the chamber to change the size of the chamber, so as to drive the release film to deform in a direction close to or away from the forming platform.

[0006] When the trough device of the present application is working, during the printing process, when the position of the molding platform relative to the release film is inaccurate, or the release film is bent under the gravity of the consumables, and the spacing between the molding platform and the release film is uneven, the air circuit component inflates the chamber to expand the chamber, thereby deforming the release film, and keeping the spacing between the release film and the molding platform roughly the same at all places, so that the model formed by the solidification of the consumables can be stably bonded to the surface of the molding platform, thereby improving the printing reliability of the model. After the printing is completed, when the molding platform moves away from the release film, the air circuit component evacuates the chamber to shrink the chamber, thereby causing the release film to sag in the direction away from the model, forming a negative pressure in the chamber, which is conducive to the separation of the model from the release film, and at the same time, the sealing film is dented in the direction close to the model, so that the space between the sealing film and the printing screen forms a negative pressure, reducing the release force required to separate the model from the release film, increasing the release speed of the model, and improving the printing efficiency.

[0007] At the same time, when the release film is accidentally damaged, the sealing film can still play the role of carrying the consumables, so as to slow down the leakage of the consumables from the inner cavity, or even prevent the consumables from leaking from the inner cavity.

[0008] In one possible implementation:

[0009] The release film assembly further includes a separator, which is disposed between the release film and the sealing film and located at edges of the release film and the sealing film to form the chamber between the release film and the sealing film.

[0010] In one possible implementation:

[0011] The partition is annular, an avoidance groove is provided on the inner side of the partition, a first air inlet hole is provided on the edge of the sealing film, the first air inlet hole is arranged opposite to the avoidance groove, and the first air inlet hole connects the air path component and the chamber.

[0012] In one possible implementation:

[0013] The release film assembly further includes a first pressing piece and a second pressing piece, wherein the first pressing piece and the second pressing piece are spaced apart from each other, and edges of the release film and the sealing film are fixedly connected between the first pressing piece and the second pressing piece.

[0014] In one possible implementation:

[0015] The first pressing piece is provided with an air inlet channel, the sealing film is provided with a first air inlet hole, one end of the air inlet channel is connected to the chamber through the first air inlet hole, and the other end of the air inlet channel is connected to the air path component.

[0016] In one possible implementation:

[0017] The first pressing part is provided with an air groove, the opening of the air groove is arranged opposite to the first air inlet hole, the sealing film covers the opening of the air groove, and the first pressing part is also provided with a second air inlet hole, one end of the second air inlet hole is connected to the air groove, and the other end is connected to the air path component, and the air groove and the second air inlet hole together form the air inlet channel.

[0018] In one possible implementation:

[0019] The first pressing piece is annular, and the air groove is an annular groove extending along the circumference of the surface of the first pressing piece.

[0020] In one possible implementation:

[0021] The bottom surface of the outer frame is provided with a mounting groove, and the release film assembly is installed in the mounting groove.

[0022] In one possible implementation:

[0023] The air circuit assembly includes: a pump body, which is connected to the chamber through a pipeline; a detection component, which is connected to the pipeline and is used to detect the air pressure in the chamber; a controller, which is connected to the detection component and the pump body, and is used to receive the air pressure detected by the detection component, and the controller is used to control the pump body to evacuate or inflate.

[0024] In a second aspect, the present application provides a 3D printer, comprising the aforementioned material trough device and a molding platform, wherein the molding platform is movably disposed on a side of the release film away from the sealing film. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 It is a schematic structural diagram of a 3D printer according to an embodiment of the present application.

[0027] Figure 2 for Figure 1 sectional view of .

[0028] Figure 3 for Figure 1 Schematic diagram of the explosion structure of the middle trough device.

[0029] Figure 4 for Figure 1 A three-dimensional cross-sectional view of the middle trough device.

[0030] Figure 5 for Figure 4 A schematic diagram of the enlarged local structure at point A in the middle.

[0031] Figure 6 for Figure 1 Schematic diagram of the partial structure of the first pressing part, sealing film and separator of the middle trough device.

[0032] Figure 7 for Figure 1 Schematic diagram of the structure of the sealing membrane and separator of the middle trough device.

[0033] Figure 8 for Figure 1 Schematic diagram of the partial structure of the first pressing part of the middle trough device.

[0034] Fig. 9 It is a schematic structural diagram of a material trough device according to an embodiment of the present application.

[0035] Fig.10 for Fig. 9 A magnified schematic diagram of the local structure at point B in the middle.

[0036] Description of main component symbols:

[0037]

[0038] DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0040] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be a centered element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may also be a centered element. When an element is considered to be "set on" another element, it may be directly set on the other element or there may also be a centered element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present application. The terms used herein in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "or / and" used herein includes any and all combinations of one or more related listed items.

[0042] Some embodiments of the present application are described in detail. In the absence of conflict, the following embodiments and features of the embodiments can be combined with each other.

[0043] Example

[0044] See also Figure 1 and Figure 2 This embodiment provides a 3D printer 200, including a trough device 100, a driving device 205, a middle plate 202, a printing screen 204 and a molding platform 201.

[0045] The printing screen 204 is arranged on the middle plate 202, the material trough device 100 is located above the printing screen 204, the material trough device 100 is used to carry the photocurable consumables, the forming platform 201 is connected to the driving device 205, and the printing screen 204 is arranged below the material trough device 100. The forming platform 201 can move relative to the material trough device 100 under the drive of the driving device 205.

[0046] The driving device 205 can be specifically configured as a linear module, a driving motor, etc.

[0047] See also Figures 3 to 5 The material tank device 100 includes an outer frame 10, a release film assembly 20 and an air path assembly 30. The outer frame 10 is provided with an inner cavity 11. The release film assembly 20 includes a release film 21 and a sealing film 22. The release film 21 and the inner cavity 11 enclose a material tank. The sealing film 22 is arranged on a side of the release film 21 away from the outer frame 10. The sealing film 22 and the release film 21 enclose a chamber 23 (see Figure 5 The air circuit assembly 30 is connected to the chamber 23 and is configured to inflate or exhaust the chamber 23 to change the size of the chamber 23 so as to drive the release film 21 to deform in a direction close to or away from the molding platform 201 .

[0048] When the trough device 100 of this embodiment is working, during the printing process, when the position of the molding platform 201 relative to the release film 21 is inaccurate, or the release film 21 is bent under the gravity of the consumables, and the distance between the molding platform 201 and the release film 21 is uneven, the air circuit assembly 30 inflates the chamber 23 to expand the chamber 23, thereby deforming the release film 21 and maintaining the distance between the release film 21 and the molding platform 201 at various locations approximately the same, so that the model formed by the solidification of the consumables can be stably bonded to the surface of the molding platform 201, thereby improving the printing reliability of the model. After printing is completed, when the forming platform 201 moves away from the release film 21, the air circuit assembly 30 evacuates the chamber 23 to shrink the chamber 23, thereby causing the release film 21 to sag in the direction away from the model, forming a negative pressure in the chamber 23, which is beneficial to the separation of the model from the release film 21. At the same time, the sealing film 22 is also dented in the direction close to the model, forming a negative pressure in the space between the sealing film 22 and the printing screen 204, reducing the release force required to separate the model from the release film 21, increasing the release speed of the model, and improving printing efficiency.

[0049] At the same time, when the release film 21 is accidentally damaged, the sealing film 22 can still play the role of carrying the consumables, so as to slow down the leakage speed of the consumables from the inner cavity 11, or even prevent the consumables from leaking from the inner cavity 11.

[0050] In addition, when printing a model with a large area, the trough device 100 of the present application can still ensure the rapid separation of the model and the release film 21, which can further improve the printing efficiency of the large-area model.

[0051] During the actual printing process, as the light-curing printing proceeds, the air circuit assembly 30 can also perform air extraction according to actual printing requirements, so that the air pressure in the chamber 23 gradually drops to the standard atmospheric pressure, and the release film 21 returns to its natural state, which is conducive to the smooth and normal printing.

[0052] In addition, in this embodiment, the molding platform 201 can be located above the trough device 100 or below the trough device 100, and the positional relationship between the molding platform 201 and the trough device 100 can be adjusted according to the design requirements of the 3D printer 200. Regardless of the positional relationship, the trough device 100 of this embodiment can adjust the distance between the release film 21 and the molding platform 201 through the air path assembly 30, and improve the printing reliability.

[0053] In this embodiment, the release film 21 can be set to existing fluorinated ethylene propylene (FEP), specially treated FEP film, anti-fingerprint film (AF) and other fluorine-containing films. In other embodiments, the release film 21 can also be set to other film materials used for photocuring printing.

[0054] The sealing film 22 may also be an existing fluorine-containing film such as FEP, NFEP, AF, or a film with high light transmittance, such as a high light transmittance plastic film, etc. In other embodiments, the sealing film 22 may also be other film materials used for photocuring printing.

[0055] In this embodiment, see Figure 4 , the release film assembly 20 is disposed on one side of the outer frame 10. In other embodiments, the release film assembly 20 can also be disposed in the inner cavity 11, and the edge of the release film assembly 20 is embedded in the outer frame 10. The connection method between the release film assembly 20 and the outer frame 10 can be set according to actual needs, and this embodiment does not specifically limit it.

[0056] In this embodiment, see Figure 3 and Figure 5 The release film assembly 20 further includes a separator 24 , which is disposed between the release film 21 and the sealing film 22 and located at the edges of the release film 21 and the sealing film 22 to form a chamber 23 between the release film 21 and the sealing film 22 .

[0057] The edges of the release film 21 and the sealing film 22 are supported by the separator 24, so that the release film assembly 20 still has a chamber 23 in a natural state, thereby preventing the release film 21 from sagging to the sealing film 22 under the action of its own gravity, ensuring that the chamber 23 has a certain volume in the initial state, reducing the pressure on the release film 21 when the air path assembly 30 is inflated, and extending the service life of the release film 21.

[0058] The separator 24 can be sealed and connected with the release film 21 and the sealing film 22 by various sealing methods, which will not be described in detail here.

[0059] Optionally, the thickness of the separator 24 is 0.01 mm to ensure separation between the release film 21 and the sealing film 22. Advantageously, the thickness of the separator 24 can be set between 0.05 mm and 0.2 mm, for example, the thickness of the separator 24 can be set to 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.10 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.20 mm, etc. In other embodiments, the thickness of the separator 24 can also be set to be greater than 0.2 mm.

[0060] In this embodiment, see Figure 6 and Figure 7 The partition 24 is annular, and an avoidance groove 241 is provided on the inner side of the partition 24. A first air inlet hole 221 is provided on the edge of the sealing membrane 22. The first air inlet hole 221 is arranged opposite to the avoidance groove 241. The first air inlet hole 221 connects the air path component 30 and the chamber 23.

[0061] The annular separator 24 can reliably separate the release film 21 and the sealing film 22. The first air inlet 221 and the avoidance groove 241 can facilitate the communication between the chamber 23 and the air path assembly 30.

[0062] In this embodiment, see Figure 6 There are multiple avoidance grooves 241, and multiple avoidance grooves 241 are respectively provided on both sides of the partition 24, and the multiple avoidance grooves 241 are evenly distributed. In other embodiments, the multiple avoidance grooves 241 can also be arranged around the inner side of the partition 24.

[0063] In other embodiments of the present application, the separator 24 may also be configured as a plurality of independent sheets, and the avoidance groove 241 is disposed on a side of the sheet away from the edge of the release film 21 .

[0064] In other embodiments of the present application, a vent hole may also be provided at the partition 24, and the vent hole is arranged opposite to the first air inlet hole 221, so that the air path component 30 can also be connected to the chamber 23 through the first air inlet hole 221 and the vent hole. In addition, the avoidance groove 241 and the first air inlet hole 221 may also be arranged in a partially corresponding manner, as long as the chamber 23 and the air path component 30 can be connected.

[0065] In this embodiment, see Figures 3 to 5 The release film assembly 20 also includes a first pressing piece 25 and a second pressing piece 26, which are arranged at intervals, and the edges of the release film 21 and the sealing film 22 are fixedly connected between the first pressing piece 25 and the second pressing piece 26. In this way, the first pressing piece 25 and the second pressing piece 26 can firmly fix the edges of the release film 21 and the sealing film 22, so that during the air extraction or inflation process of the air path assembly 30, the edges of the release film 21 and the sealing film 22 can maintain a reliable sealed connection. In addition, by setting the first pressing piece 25 and the second pressing piece 26, the release film assembly 20 can form a separate whole, which reduces the assembly difficulty of the trough device 100, improves the assembly efficiency of the trough device 100, and is also conducive to the replacement of the release film assembly 20.

[0066] Of course, in other embodiments of the present application, the release film 21 and the sealing film 22 can also be fixed to the outer frame 10 by a separate fixing structure, so that the top surface of the release film 21 abuts against the outer frame 10, and the outer frame 10 and the release film assembly 20 form a whole. Therefore, the connection structure between the release film assembly 20 and the outer frame 10 can be adjusted according to actual needs, and this application does not specifically limit it.

[0067] In this embodiment, see Figure 5 and Figure 8 The first pressing member 25 is provided with an air inlet channel 251, the sealing film 22 is provided with a first air inlet hole 221, one end of the air inlet channel 251 is connected to the chamber 23 through the first air inlet hole 221, and the other end of the air inlet channel 251 is connected to the air path assembly 30. In this way, the air path between the air path assembly 30 and the chamber 23 can be ensured to have reliable sealing performance.

[0068] In this embodiment, see Figure 5 and Figure 6 The first pressing part 25 is provided with an air groove 252, the opening of the air groove 252 is arranged opposite to the first air inlet hole 221, the sealing film 22 covers the opening of the air groove 252, and the first pressing part 25 is also provided with a second air inlet hole 253, one end of the second air inlet hole 253 is connected to the air groove 252, and the other end is connected to the air path component 30, and the air groove 252 and the second air inlet hole 253 together form an air inlet channel 251. In this way, the air path component 30 is connected to the chamber 23 through the second air inlet hole 253, the air groove 252 and the first air inlet hole 221 in sequence.

[0069] In this embodiment, see Figure 8 The air groove 252 is provided on the surface of the first pressing part 25, so that the difficulty of the first pressing part 25 can be reduced and the air extraction efficiency and the air charging efficiency can be improved. In other embodiments, the air inlet channel 251 can also be provided inside the first pressing part 25. Therefore, the specific structure of the air inlet channel 251 can be adjusted according to the actual processing requirements and the air extraction and air charging requirements.

[0070] In this embodiment, see Figure 8 The second air inlet 253 is arranged along the thickness direction of the first pressing piece 25 and is arranged adjacent to and communicated with the air groove 252. In other embodiments, the second air inlet 253 can also be opened along the side of the first pressing piece 25 and communicated with the side of the air groove 252.

[0071] In this embodiment, the number of the second air inlet holes 253 may be multiple, and the multiple second air inlet holes 253 can improve the uniformity of air extraction and inflation, so as to make the release film 21 produce uniform deformation.

[0072] In this embodiment, see Figure 3 The first pressing piece 25 is annular, and the gas groove 252 is an annular groove extending along the circumferential direction of the surface of the first pressing piece 25. In this way, during the inflation process, the gas enters the gas groove 252 after passing through the second gas inlet hole 253, and the gas entering the annular gas groove 252 enters the chamber 23 uniformly, so that the gas can enter the chamber 23 from all parts of the annular gas groove 252, further improving the inflation uniformity.

[0073] In this embodiment, the shapes of the first pressing member 25 and the second pressing member 26 are both the same as the edge shape of the release film 21 , so as to ensure the reliability of the pressing of the release film 21 and the sealing film 22 .

[0074] In this embodiment, see Figure 3 The release film 21 is provided with a plurality of first fixing holes 211, the sealing film 22 is provided with a plurality of second fixing holes 222, the first pressing member 25 is provided with a third fixing hole 254, and the second pressing member 26 is provided with a fourth fixing hole 261. The release film assembly 20 further includes a first locking member 271 (see Figure 3 and Fig.10 ), the first locking member 271 passes through the fourth fixing hole 261, the second fixing hole 222, the partition 24 and the first fixing hole 211 in sequence, and is fixedly connected to the third fixing hole 254 to seal and fix the edge of the release film 21 and the sealing film 22.

[0075] The first locking member 271 may be specifically configured as a bolt. In other embodiments, the first pressing member 25 may also be connected to the second pressing member 26 by welding.

[0076] In this embodiment, see Figure 3 The first pressing member 25 is also provided with a fifth fixing hole 255, the second pressing member 26 is also provided with a sixth fixing hole 262, the release film 21 is also provided with a seventh fixing hole 212, and the sealing film 22 is also provided with an eighth fixing hole 223, and the fifth fixing hole 255 is staggered with the third fixing hole 254, the sixth fixing hole 262 is staggered with the fourth fixing hole 261, the seventh fixing hole 212 is staggered with the first fixing hole 211, and the eighth fixing hole 223 is staggered with the second fixing hole 222. The fifth fixing hole 255, the sixth fixing hole 262, the seventh fixing hole 212 and the eighth fixing hole 223 are arranged in sequence. The release film assembly 20 also includes a second locking member 272 (see Figure 3 and Fig.10 ), the second locking member 272 passes through the fifth fixing hole 255, the seventh fixing hole 212, the partition 24, the eighth fixing hole 223 and the sixth fixing hole 262 and is connected to the outer frame 10 to fix the release film assembly 20 to the outer frame 10.

[0077] The second locking member 272 can be specifically configured as a bolt. In other embodiments, the second pressing member 26 can be welded to the outer frame 10 to achieve a fixed connection between the release film assembly 20 and the outer frame 10 .

[0078] In this embodiment, see Fig.10 The fixing directions of the first locking member 271 and the second locking member 272 are opposite to each other, so as to ensure the overall fixing reliability of the release film assembly 20 and the outer frame 10 after being fixed.

[0079] In this embodiment, see Figure 5 The bottom surface of the outer frame 10 is provided with a mounting groove 12, and the release film assembly 20 is installed in the mounting groove 12. In this way, the overall height of the trough device 100 can be reduced to be applicable to a variety of 3D printers 200, thereby increasing the applicable scope of the trough device 100.

[0080] In this embodiment, the outer frame 10 is annular, and the mounting groove 12 is annular, so as to improve the installation reliability of the release film assembly 20 .

[0081] In this embodiment, see Figure 5 The first pressing piece 25 and the second pressing piece 26 of the release film assembly 20 are both fitted into the installation groove 12 , and the second locking piece 272 is fixedly connected to the bottom surface of the installation groove 12 .

[0082] In this embodiment, see Fig. 9The air circuit assembly 30 includes a pump body 31, a pipeline 32, a detection member 33 and a controller 35. The pump body 31 is connected to the chamber 23 through the pipeline 32. The detection member 33 is connected to the pipeline 32, and the detection member 33 is used to detect the air pressure of the chamber 23. The controller 35 is connected to the detection member 33 and the pump body 31, and the controller 35 is used to receive the air pressure detected by the detection member 33, and the controller 35 is used to control the pump body 31 to evacuate or inflate.

[0083] Optionally, the pump body 31 can be configured as a diaphragm air pump, which can provide positive or negative air pressure to facilitate the pumping or inflating action. Of course, in other embodiments, the pump body 31 can also be configured as an ordinary air pump.

[0084] In this embodiment, the gas circuit assembly 30 further includes a gas nozzle 36, which is connected to the end of the pipeline 32. The middle plate 202 is provided with a mounting hole 203, and the gas nozzle 36 is matched in the mounting hole 203 and extends into the second gas inlet hole 253 of the first pressing member 25, so as to be connected to the chamber 23 through the gas groove 252 and the first gas inlet hole 221.

[0085] Optionally, the mounting hole 203 is a stepped hole to ensure a stable connection between the air nozzle 36 and the middle plate 202 .

[0086] Optionally, the air nozzle 36 is in sealing cooperation with the inner surface of the mounting hole 203 , so that the chamber 23 is in a sealed state.

[0087] In this embodiment, see Fig. 9 The gas circuit assembly 30 further includes a gas buffer 34, which is disposed in the pipeline 32, one side of the gas buffer 34 is connected to the detection element 33, and the other side of the gas buffer 34 is connected to the pump body 31. The gas buffer 34 can play a gas buffering role, so that the inflation or deflation action of the gas circuit assembly 30 is more stable, so that the speed of change of the gas pressure in the chamber 23 is more uniform, thereby extending the service life of the release film assembly 20.

[0088] The above implementation modes are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the above preferred implementation modes, a person skilled in the art should understand that the technical solutions of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A trough device, arranged on one side of a forming platform, characterized in that: The trough device comprises: An outer frame, wherein the outer frame is provided with an inner cavity; A release film assembly, the release film assembly comprising a release film and a sealing film, the release film and the inner cavity enclose a material slot, the sealing film is arranged on a side of the release film away from the outer frame, and the sealing film and the release film enclose a chamber; The air circuit component is connected to the chamber and is configured to inflate or evacuate the chamber to change the size of the chamber, so as to drive the release film to deform in a direction close to or away from the forming platform.

2. The trough device according to claim 1, characterized in that: The release film assembly further includes a separator, which is disposed between the release film and the sealing film and located at edges of the release film and the sealing film to form the chamber between the release film and the sealing film.

3. The trough device according to claim 2, characterized in that: The partition is annular, an avoidance groove is provided on the inner side of the partition, a first air inlet hole is provided on the edge of the sealing film, the first air inlet hole is arranged opposite to the avoidance groove, and the first air inlet hole connects the air path component and the chamber.

4. The trough device according to claim 1, characterized in that: The release film assembly further includes a first pressing piece and a second pressing piece, the first pressing piece and the second pressing piece are arranged at an interval, and the edges of the release film and the sealing film are fixedly connected between the first pressing piece and the second pressing piece.

5. The trough device according to claim 4, characterized in that: The first pressing piece is provided with an air inlet channel, the sealing film is provided with a first air inlet hole, one end of the air inlet channel is connected to the chamber through the first air inlet hole, and the other end of the air inlet channel is connected to the air path component.

6. The trough device according to claim 5, characterized in that: The first pressing part is provided with an air groove, the opening of the air groove is arranged opposite to the first air inlet hole, the sealing film covers the opening of the air groove, and the first pressing part is also provided with a second air inlet hole, one end of the second air inlet hole is connected to the air groove, and the other end is connected to the air path component, and the air groove and the second air inlet hole together form the air inlet channel.

7. The trough device according to claim 6, characterized in that: The first pressing piece is annular, and the air groove is an annular groove extending along the circumference of the surface of the first pressing piece.

8. The trough device according to claim 4, characterized in that: The bottom surface of the outer frame is provided with a mounting groove, and the release film assembly is installed in the mounting groove.

9. The trough device according to claim 1, characterized in that: The gas circuit assembly comprises: A pump body, the pump body being connected to the chamber through a pipeline; A detection member, the detection member is connected to the pipeline, and the detection member is used to detect the air pressure of the chamber; A controller is connected to the detection member and the pump body, the controller is used to receive the air pressure detected by the detection member, and the controller is used to control the pump body to evacuate or inflate.

10. A 3D printer, characterized in that: include: A trough device as claimed in any one of claims 1 to 9; The molding platform is movably arranged on a side of the release film away from the sealing film.

Images