3D printing equipment with auxiliary release mechanism

Abstract

The utility model discloses 3D printing equipment with an auxiliary release mechanism, which comprises an exposure screen arranged in an equipment main body and a trough arranged above the exposure screen, a release film is arranged at the bottom of the trough, and the exposure screen and the release film are matched to form a cavity. And an air inlet and outlet channel for easily separating the release film from the printing model is arranged in the cavity. The 3D printing equipment solves the problems that 3D printing equipment in the prior art is low in printing success rate, low in printing speed and difficult to demould, and improves the printing fineness.

Description

Technical Field

[0001] The utility model relates to the field of 3D printing equipment, and in particular to a 3D printing equipment with an auxiliary release mechanism. Background Art

[0002] 3D printing is a type of rapid prototyping technology, also known as additive manufacturing. It is a technology that uses digital model files as the basis, using powdered metal or photosensitive resin and other bondable materials to construct objects by printing layer by layer. For small and micro 3D printing equipment, it is a cost-effective and rapid solution suitable for proofing and small batch production applications.

[0003] At present, in the process of photocuring 3D printing, when printing is completed, the model and the release film need to be separated (demolded). The existing method is to use negative pressure to form a negative pressure in the chamber below the release film (currently a double-layer structure consisting of a layer of release film and a layer of glass or PET film) before printing, so that the light-transmitting glass and the release film are tightly attached. After exposure until the printing is completed, a positive pressure device is used to pass gas to form a positive pressure in the chamber, so that the release film and the light-transmitting glass are separated, and the model is also separated from the release film. However, this printing process and demolding process not only involve more devices (including positive and negative pressure devices, etc.), but also require additional components such as glass that cooperate with the release film. Since a double layer of release film and glass (the glass is located above the screen) are set, the printing accuracy will also be affected.

[0004] In view of this, the present technical solution proposes a 3D printing device with an auxiliary release mechanism, which can achieve demolding by using only a positive pressure device, and there is no need to set a double-layer release film structure between the release film and the screen that affects the printing accuracy. This not only improves the printing accuracy, but also realizes the separation of the model and the release film, reduces components, facilitates production assembly and maintenance, reduces costs, and reduces the difficulty of user replacement. Utility Model Content

[0005] The technical solution of the utility model at least solves one of the technical problems in the related art to a certain extent. To this end, the main purpose of the utility model is to provide a 3D printing device with an auxiliary release mechanism, aiming to solve the problem that the 3D printing device in the prior art has low precision and a complex demoulding structure.

[0006] To achieve the above-mentioned purpose, the utility model provides a 3D printing device with an auxiliary release mechanism, comprising an exposure screen arranged in a device body, and a material trough arranged above the exposure screen.

[0007] A release film is provided at the bottom of the trough.

[0008] The exposure screen and the release film cooperate to form a chamber, and the chamber is provided with an air inlet and outlet passage for facilitating the separation of the release film and the printing model.

[0009] As a further solution of the utility model, the exposure screen includes a light source, glass and a screen arranged in sequence from the bottom to the top, and the release film is located above the screen.

[0010] As a further solution of the present invention, the device body also includes a building mechanism located above the release film.

[0011] As a further solution of the utility model, a middle plate for installing the material trough and the exposure screen is also provided in the main body of the equipment, and the air intake and exhaust passages are arranged on the middle plate.

[0012] As a further solution of the utility model, the air intake and exhaust passage includes a first air hole arranged on the middle plate, and a gap for exhaust is formed between the material trough and the middle plate.

[0013] As a further solution of the utility model, the air inlet and outlet passage also includes a second air hole arranged on the material trough, and when the first air hole is an air inlet hole, the second air hole is an air outlet hole.

[0014] As a further solution of the present invention, the second air hole and the first air hole can be arranged on the middle plate.

[0015] As a further solution of the utility model, a protective film is attached to the exposure screen, and a channel for ventilation is opened on the protective film.

[0016] As a further solution of the present invention, one of the first pore and the second pore is an oxygen inlet hole, and the release film is a single-layer oxygen-permeable film structure that cooperates with the oxygen inlet hole to achieve oxygen permeability.

[0017] As a further solution of the utility model, the first air hole and the second air hole are both arranged on the material trough.

[0018] The beneficial effects of the utility model are as follows:

[0019] The 3D printing device with auxiliary release mechanism proposed in the utility model has a single-layer release film. When demolding, positive pressure gas is passed to the release film and the space below (chamber) through the air inlet channel (to prevent the release film from being vacuum-absorbed by the exposure screen or the protective film on the exposure screen and from deforming). The printed model and the release film are gradually demolded by the deformation of the release film. After demolding, the positive pressure gas is stopped from being passed to the chamber. The gas in the chamber is discharged through the air inlet and outlet channels under the action of the rebound of the release film and the downward pressure of the resin gravity. The final printed model can be made more refined, and the simple equipment structure is easy to assemble and maintain. In addition, the release film can also be an oxygen-permeable film. When printing, oxygen at a suitable pressure is continuously passed to the chamber. The oxygen passes through the oxygen-permeable film and contacts with the liquid photosensitive resin to produce an oxygen inhibition effect, so that the place where the photosensitive resin contacts oxygen will not solidify even under exposure conditions, while the place that does not contact oxygen will solidify. The printed model after solidification is easier to release because it is not in direct contact with the oxygen-permeable film. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model technical solution or the utility model technical solution in the prior art, the following will briefly introduce the drawings required for use in the embodiments or the prior art description.

[0021] Obviously, the drawings described below are only some embodiments of the technical solution of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model product.

[0023] Figure 2 This is a schematic diagram of the arrangement of the equipment body, material trough and other components in the utility model.

[0024] Figure 3 It is a schematic diagram of the arrangement of the air intake and exhaust channels, the middle plate, and the material trough exposure screen in the utility model.

[0025] Figure 4 It is a schematic diagram of the arrangement of the first air hole and the second air hole in the utility model.

[0026] Figure 5 It is a schematic diagram of the setting of the release film on one side of the material trough and the middle plate on one side in the utility model.

[0027] Figure 6 It is a schematic diagram of the structure of each level of the exposure screen in the utility model.

[0028] Figure 7 It is a schematic diagram of the exposure screen on the middle plate and the middle plate arrangement in the utility model.

[0029] Figure 8 This is a schematic diagram of the first air hole arrangement in the present invention.

[0030] Fig. 9 It is a schematic diagram of the overall structure of the material trough in the utility model.

[0031] [Main parts / assembly reference numerals]

[0032] Label name Label name 1 Equipment body 22 Screen 11 control Panel 3 Feed trough 12 Camera 30 Release film 13 Building an organization 4 Intake and exhaust passages 2 Exposure screen 40 The first pore 20 light source 41 Second air hole 21 Glass 5 Medium board DETAILED DESCRIPTION

[0033] as follows:

[0034] Please refer to the attached Figure 1-9 ,

[0035] The main structure includes an exposure screen 2 arranged in the equipment body 1, and a material trough 3 arranged above the exposure screen 2. A release film 30 is provided at the bottom of the material trough 3. The exposure screen 2 and the release film 30 cooperate to form a chamber, and the chamber is provided with an air inlet and outlet channel 4 for easily separating the release film 30 from the printing model.

[0036] Here’s how it works:

[0037] A single-layer release film 30 structure is adopted, and the bottom of the release film 30 is the exposure screen 2. When the construction mechanism 13 in the equipment body 1 is lifted after downward exposure and printing a layer, the chamber between the exposure screen 2 and the release film 30 is provided with an air inlet and outlet channel 4 for air intake and exhaust to pass positive pressure gas to separate the release film 30 from the exposure screen 2), to prevent the release film 30 and the exposure screen 2 from being vacuum-sucked during release, causing the release film to deform, and to facilitate the gradual separation of the printed model from the release film 30. The reduction of unnecessary intermediate layers (film layers, etc.) improves printing accuracy and simplifies assembly and maintenance procedures.

[0038] In a preferred embodiment of the present invention, the exposure screen 2 includes a light source 20 , a glass 21 and a screen 22 which are sequentially arranged from the bottom to the top, and a release film 30 is located above the screen 22 .

[0039] Different from the prior art, the release film 30 is disposed above the exposure screen 2 without any partition in the middle.

[0040] In a preferred embodiment of the present invention, the device body 1 further includes a building mechanism 13 located above the release film 30 .

[0041] The building mechanism 13 moves up and down to perform model printing and demoulding actions.

[0042] In a preferred embodiment of the present invention, a middle plate 5 for mounting the material trough 3 and the exposure screen 2 is further provided in the device body 1 , and the air inlet and outlet passages 4 are provided on the middle plate 5 .

[0043] The intake and exhaust passages 4 may be installed on the middle plate 5 , for example, the intake and exhaust passages may be provided on both sides of the middle plate 5 .

[0044] In a preferred embodiment of the present invention, the air intake and exhaust passage 4 includes a first air hole 40 disposed on the middle plate 5 , and a gap for exhaust is formed between the material trough 3 and the middle plate 5 .

[0045] When the first air hole 40 is disposed on the middle plate 5 , the gap between the release film 30 and the exposure screen 2 can be used as an exhaust port.

[0046] In a preferred embodiment of the present invention, the air inlet and outlet passage 4 further includes a second air hole 41 disposed on the material trough 3. When the first air hole 40 is an air inlet hole, the second air hole 41 is an air outlet hole.

[0047] When the first air hole 40 is disposed on the middle plate 5 , the second air hole 41 may also be disposed on the material trough 3 . In this case, if the first air hole 40 is an air inlet hole, the second air hole 41 is an air outlet hole.

[0048] In a preferred embodiment of the present invention, the second air hole 41 and the first air hole 40 can be arranged on the middle plate 5 or on the material trough.

[0049] In a preferred embodiment of the present invention, a protective film is attached to the exposure screen 2, and a ventilation channel is provided on the protective film (or no ventilation channel is provided, and a gap between the protective film and the release film is left as an exhaust channel, in which case the protective film only serves as a protective film).

[0050] A protective film may be attached to the exposure screen 2. If no exhaust passage is provided on the middle plate 5 and the material trough 3, the protective film may provide an exhaust passage or a gap may be provided between the release film and the protective film to serve as the exhaust passage.

[0051] In a preferred embodiment of the present invention, one of the first air hole 40 and the second air hole 41 is an oxygen inlet hole, and the release film 30 is a single-layer oxygen permeable film structure that cooperates with the oxygen inlet hole to achieve oxygen permeability. When the release film 30 is an oxygen permeable film, oxygen sent into the air inlet hole passes through the release film 30 and contacts with the liquid photosensitive resin to form an oxygen inhibition effect, making it easier to separate the printed model from the release film 30.

[0052] In a preferred embodiment of the utility model, the first air hole and the second air hole are both arranged on the material trough. The first air hole and the second air hole can also be arranged on the material trough at the same time, and can respectively realize the functions of air intake and exhaust channels.

[0053] The above are only preferred embodiments of the technical solution of the utility model, and do not limit the patent scope of the technical solution of the utility model. All equivalent structural changes made by using the contents of the technical solution description and drawings of the utility model under the conception of the technical solution of the utility model, or direct / indirect application in other related technical fields are included in the patent protection scope of the technical solution of the utility model.

Claims

1. A 3D printing device with an auxiliary release mechanism, characterized in that: include An exposure screen is arranged in the main body of the device, and a material trough is arranged above the exposure screen, A release film is provided at the bottom of the trough. The exposure screen and the release film cooperate to form a chamber, and the chamber is provided with an air inlet and outlet passage for facilitating the separation of the release film and the printing model.

2. The 3D printing device with auxiliary release mechanism according to claim 1, characterized in that: The exposure screen comprises a light source, glass and a screen which are sequentially arranged from the bottom to the top, and the release film is located above the screen.

3. The 3D printing device with auxiliary release mechanism according to claim 1, characterized in that: The device body also includes a building mechanism located above the release film.

4. The 3D printing device with auxiliary release mechanism according to claim 1, characterized in that: A middle plate for mounting the material trough and the exposure screen is also provided in the main body of the device, and the air inlet and outlet passages are arranged on the middle plate.

5. The 3D printing device with auxiliary release mechanism according to claim 4, characterized in that: The air inlet and outlet passage comprises a first air hole arranged on the middle plate, and a gap for exhaust is formed between the release film and the exposure screen.

6. The 3D printing device with auxiliary release mechanism according to claim 5, characterized in that: The air inlet and outlet passage also includes a second air hole arranged on the material trough. When the first air hole is an air inlet hole, the second air hole is an air outlet hole.

7. The 3D printing device with auxiliary release mechanism according to claim 6, characterized in that: The second air hole and the first air hole can both be arranged on the middle plate.

8. The 3D printing device with auxiliary release mechanism according to claim 1, characterized in that: A protective film is attached to the exposure screen, and a ventilation channel for assisting mold release is opened on the protective film.

9. The 3D printing device with auxiliary release mechanism according to claim 6, characterized in that: One of the first pore and the second pore is an oxygen inlet hole, and the release film is a single-layer oxygen-permeable film structure that cooperates with the oxygen inlet hole to achieve oxygen permeability.

10. The 3D printing device with auxiliary release mechanism according to claim 6, characterized in that: The first air hole and the second air hole are both arranged on the material trough.

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