Stretched film overturning driving mechanism

Abstract

The utility model relates to the technical field of photocuring 3D printing, and discloses a stretched film overturning driving mechanism which comprises an overturning driving mechanism and a stretched film assembly provided with a release film, the stretched film assembly is rotationally arranged at the position of a pool opening of a material pool and connected with the output end of the overturning driving mechanism, and the output end of the overturning driving mechanism is connected with the release film. The turnover driving mechanism is used for driving the membrane stretching assembly to rotate at the pool opening position so as to be switched between an inclined state and a horizontal state. The film stretching assembly is overturned to be in an inclined state, so that bubbles in the printing material liquid attached to the lower surface of the release film obliquely flow downwards along with the printing material liquid along the lower surface of the release film; in the process that the film stretching assembly is overturned to the horizontal state, the release film in the inclined film stretching assembly makes contact with printing material liquid gradually, bubbles are prevented from being generated again, and interference of the bubbles is effectively avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of photocuring 3D printing, and particularly relates to a film stretching and turning driving mechanism. BACKGROUND

[0002] The 3D printing devices on the market mainly adopt technical modes such as photocuring, fused deposition, and powder sintering, among which the photocuring technology occupies an important position in the 3D printing industry due to its high precision, high efficiency, and high flexibility.

[0003] In the photocuring 3D printing process of the 3D printing device, air bubbles are generated and attached to the lower surface of the release film in the release process. As the printing proceeds, these air bubbles not only form cavities in the printed sample, but also may cause defects in the strength and appearance of the final product, thereby affecting the overall printing quality. The conventional method of removing bubbles is to use a scraper to eliminate the air bubbles under the release film. However, due to the small gap between the scraper and the release film, the scraper often cannot completely remove the interference of the small air bubbles, which may be fixed inside the printed object during the curing process, forming cavities and affecting the structural integrity and appearance, resulting in poor printing effect. SUMMARY

[0004] The utility model aims at providing a film stretching and turning driving mechanism, which solves the technical problem of poor printing effect caused by the difficulty of completely avoiding the interference of air bubbles by a scraper in the prior art.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a film stretching and turning driving mechanism applied to a 3D printing device, wherein the 3D printing device comprises a tank and a printing platform, the tank is used for containing printing liquid, the printing platform extends into the tank and is used for carrying a printed sample, and the film stretching and turning driving mechanism comprises:

[0007] A turning driving mechanism and a film stretching assembly provided with a release film, the film stretching assembly can be rotatably arranged at the tank opening position of the tank, the film stretching assembly is connected with the output end of the turning driving mechanism, and the turning driving mechanism is used for driving the film stretching assembly to rotate at the tank opening position to switch between the inclined state and the horizontal state.

[0008] The 3D printing device comprises a material pool, a printing platform and a film turning driving mechanism, the material pool is used for containing a printing material liquid, the printing platform is used for carrying a printing sample, and the output end of the turning driving mechanism in the film turning driving mechanism is connected with a film assembly to drive the film assembly to turn at the pool opening position of the material pool, so that the bubbles on the liquid surface of the printing material liquid are moved to a non-printing area along with the printing material liquid flowing downward along the inclined film assembly in the turning process of the film assembly, the inclined film assembly is gradually contacted with the printing material liquid in the process of turning the film assembly to the horizontal state after the bubbles are removed, and the bubbles are avoided to be generated between the two, the interference of the bubbles is effectively avoided, and the printing quality is improved.

[0009] As a preferred solution of the above film turning driving mechanism, the turning driving mechanism comprises:

[0010] A driving assembly, the output end of the driving assembly is in transmission connection with the film assembly, and the driving assembly can drive the film assembly to turn.

[0011] The output end of the driving assembly is in transmission connection with the film assembly, and the turning of the film assembly is automatically driven by the driving assembly.

[0012] As a preferred solution of the above film turning driving mechanism, the turning driving mechanism further comprises:

[0013] A turning assembly, the output end of the driving assembly is connected with the film assembly through a rotating part, and the driving assembly is used to drive the rotating part to rotate to drive the film assembly to turn.

[0014] The output end of the driving assembly is connected with the film assembly through the rotating part to realize force transmission through the rotating part, and the structure is simple.

[0015] As a preferred solution of the above film turning driving mechanism, the turning assembly further comprises:

[0016] A fixing part, the fixing part is fixedly arranged opposite to the material pool, and the rotating part is rotationally arranged on the fixing part.

[0017] The fixing part can support the rotating part.

[0018] As a preferred solution of the above film turning driving mechanism, the turning assembly further comprises:

[0019] A mounting bracket, the mounting bracket can be mounted on the material pool, and the fixing part is mounted on the mounting bracket.

[0020] The fixing part is installed on the material pool through the mounting support, and the rotating part is rotatably installed on the fixing part, which ensures the stability of the rotating part during rotation.

[0021] As a preferred solution of the above-mentioned film rolling and turning driving mechanism, the driving assembly comprises:

[0022] A fixing support;

[0023] A driving motor is installed on the fixing support, and the driving motor is connected with the rotating part through a linkage shaft.

[0024] The driving motor is fixed through the fixing support to realize the installation of the driving motor, and the driving motor is connected with the rotating part through the linkage shaft, so that the rotation of the driving motor is stably transmitted to the rotating part.

[0025] As a preferred solution of the above-mentioned film rolling and turning driving mechanism, the film rolling assembly comprises:

[0026] A rolling frame is connected with the output end of the turning driving mechanism, the release film is installed on the rolling frame, and the rolling frame is used for rolling the release film.

[0027] The release film is installed on the rolling frame, the release film can be rolled through the rolling frame, the distance between the release film and the printing layer is ensured, and the printing quality is improved; and the installation of the release film on the rolling frame can facilitate the separation of the printing sample and the release film.

[0028] As a preferred solution of the above-mentioned film rolling and turning driving mechanism, a through hole is arranged at the center position of the rolling frame, and the release film is arranged opposite to the through hole.

[0029] The arrangement of the through hole avoids shielding the irradiation of the curing light source above the rolling frame on the printing liquid.

[0030] As a preferred solution of the above-mentioned film rolling and turning driving mechanism, the rotating angle range of the film rolling assembly is 0-90°.

[0031] The film rolling assembly rotates in the range of 0-90° to realize the switching between the inclined state and the horizontal state.

[0032] As a preferred solution of the above-mentioned film rolling and turning driving mechanism, the rotating angle range of the film rolling assembly is 0-30°.

[0033] The film rolling assembly rotates in the range of 0-30°, so that the driving output force of the driving assembly is reduced while ensuring that the bubbles are driven to the non-printing area.

[0034] The beneficial effects of the utility model are as follows:

[0035] The utility model discloses a taut film turnover drive mechanism, including turnover drive mechanism and the taut film subassembly of being equipped with release film, the output of turnover drive mechanism is linked with taut film subassembly to drive taut film subassembly overturns in the pool mouth position of material pool, thereby makes the bubble in printing material liquid that adheres to the lower surface of release film along with printing material liquid and flows down the lower surface of release film to make bubble be driven to non -printing area in the process of defoaming through overturning taut film subassembly to the inclined state, in the process of taut film subassembly overturning to the horizontal state, the release film and printing material liquid in the inclined taut film subassembly gradually contact, avoid the bubble between release film and printing material liquid again, effectively avoid the interference of bubble, improved printing quality. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 It is the structure schematic diagram of taut film subassembly of the taut film turnover drive mechanism provided by the utility model turns up,

[0037] Figure 2 It is the side view of taut film subassembly of the taut film turnover drive mechanism provided by the utility model turns up,

[0038] Figure 3 It is the structure schematic diagram of taut film subassembly of the taut film turnover drive mechanism provided by the utility model when being horizontal,

[0039] Figure 4 It is the side view of taut film subassembly of the taut film turnover drive mechanism provided by the utility model when being horizontal,

[0040] Figure 5 It is the structure schematic diagram of turnover drive mechanism provided by the utility model.

[0041] In the drawing,

[0042] 1, material pool, 10, limit baffle, 11, printing area, 12, extension area,

[0043] 2, printing platform, 21, object table, 22, support,

[0044] 31, turnover drive mechanism, 311, turnover subassembly, 3111, rotation part, 3112, mounting support, 3113, fixed part, 312, drive assembly, 3121, fixed support, 3122, drive motor, 3123, linkage shaft, 32, taut film subassembly, 321, through -hole. DETAILED DESCRIPTION

[0045] The utility model makes further detailed explanation in combination with the drawings and embodiment. It can be understood that the specific embodiment described here is only used to explain the utility model, and is not limited to the utility model. In addition, it needs to be explained that, in order to facilitate the description, only the part related to the utility model is shown in the drawing, not all structures.

[0046] In the description of the utility model, unless another explicit provision and limitation, the term "connected", "connection", "fixed" should be broad sense understanding, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through the intermediate medium, can be two elements inside the communication or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0047] In the utility model, unless another explicit provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features direct contact, can also include the first and second features are not direct contact but contact through another feature between them. Moreover, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the horizontal height of the first feature is higher than the second feature. The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the horizontal height of the first feature is less than the second feature.

[0048] In the description of the embodiment, the terms "up", "down", "right", etc. orientation or position relationship is based on the orientation or position relationship shown in the drawing, only for the convenience of description and simplification operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0049] The 3D printing device will generate bubbles attached to the lower surface of the release film in the release process in the photocuring 3D printing process. With the printing, these bubbles will not only form cavities in the printed sample, but also may cause defects in the strength and appearance of the final product, thereby affecting the overall printing quality. The conventional bubble removal method is to use a scraper to eliminate the bubbles under the release film. However, due to the small gap between the scraper and the release film, the scraper often has difficulty in completely removing the interference of the small bubbles, which makes these small bubbles may be fixed inside the printed object during the curing process, forming cavities, thereby affecting the structural integrity and appearance, and the printing effect is poor.

[0050] In order to solve the above problems, such as Figures 1-4As shown, the embodiment provides a film flipping driving mechanism, which is applied to a 3D printing device. The 3D printing device comprises a tank 1 and a printing platform 2. The tank 1 is used for containing printing liquid. The printing platform 2 extends into the tank 1 and is used for carrying a printing sample. The film flipping driving mechanism comprises a flipping driving mechanism 31 and a film assembly 32. The film assembly 32 is rotatably arranged at a tank opening position of the tank 1. The film assembly 32 is connected with an output end of the flipping driving mechanism 31. The flipping driving mechanism 31 is used for driving the film assembly 32 to rotate at the tank opening position, so as to switch between an inclined state and a horizontal state.

[0051] In use, the film flipping driving mechanism can make the bubbles in the printing liquid attached to the lower surface of the release film flow along the inclined lower surface of the release film to the non-printing area when the film assembly 32 is flipped to the inclined state. During the process of flipping the film assembly 32 to the horizontal state, the release film and the printing liquid in the inclined film assembly 32 gradually contact. This gradual contact can avoid the generation of bubbles between the release film and the printing liquid, thereby effectively avoiding the interference of the bubbles and improving the printing quality. The film flipping driving mechanism has a simple structure. The film assembly 32 has the functions of fixing the release film and making the bubbles in the printing liquid attached to the lower surface of the release film flow to the non-printing area.

[0052] Specifically, as shown in Figure 1 , Figure 3 and Figure 5 , the flipping driving mechanism 31 comprises a flipping assembly 311 and a driving assembly 312. The flipping assembly 311 comprises a rotating part 3111 connected with the film assembly 32. The output end of the driving assembly 312 is connected with the rotating part 3111. The driving assembly 312 is used for driving the rotating part 3111 to rotate, so as to drive the film assembly 32 to flip. The output end of the driving assembly 312 is connected with the rotating part 3111 of the flipping assembly 311. The rotating part 3111 is connected with the film assembly 32. When the driving assembly 312 drives the rotating part 3111 to rotate, the film assembly 32 can be driven to rotate, so as to realize force transmission. The flipping driving mechanism 31 has a simple structure and is convenient to operate.

[0053] Further, as shown in Figure 5 , the flipping assembly 311 further comprises a mounting bracket 3112 and a fixing part 3113. The mounting bracket 3112 is mounted on the side wall of the tank 1. The fixing part 3113 is mounted on the mounting bracket 3112. The rotating part 3111 is rotatably arranged on the fixing part 3113. The flipping assembly 311 mounts the fixing part 3113 on the tank 1 through the mounting bracket 3112. The rotating part 3111 is rotatably mounted on the fixing part 3113. This structure ensures the stability of the rotating part 3111 during rotation.

[0054] In the embodiment, the structure formed by the rotating part 3111 and the fixed part 3113 rotatingly connected is a hinge, which is not only low in cost and easy to obtain, but also simple in structure.

[0055] With reference to the foregoing description of the 3D printing device, Figure 5 The driving assembly 312 comprises a fixed support 3121 and a driving motor 3122. The driving motor 3122 is installed on the fixed support 3121. The driving motor 3122 is connected with the rotating part 3111 through a linkage shaft 3123, so that the rotation of the driving motor 3122 is stably transmitted to the rotating part 3111. In the embodiment, the driving motor 3122 is a step motor.

[0056] With reference to the foregoing description of the 3D printing device, Figure 1 In the embodiment, the taut film assembly 32 comprises a taut frame connected with the output end of the turnover driving mechanism 31. The taut frame is of a frame structure. A through hole 321 is arranged on the taut frame to avoid blocking the irradiation of the curing light source located above the taut frame on the printing liquid. A release film is installed on the taut frame and located at the bottom surface of the taut frame. The release film is arranged opposite to the through hole 321 of the taut frame. The taut frame is used to tighten the release film and ensure the spacing between the release film and the printing layer, thereby improving the printing quality. The installation of the release film on the taut frame can facilitate the separation of the printing sample from the release film. In the embodiment, the rotating angle range of the taut frame of the taut film assembly 32 is 0-90°, so as to realize the switching of the taut film assembly 32 between the inclined state and the horizontal state. Alternatively, the rotating angle range of the taut frame of the taut film assembly 32 is 0-30°, so as to ensure the driving output force of the driving assembly 312 while reducing the driving output force. The specific rotating angle can be set according to actual needs, which is not limited herein.

[0057] Alternatively, the 3D printing device further comprises a lifting driving mechanism. The output end of the lifting driving mechanism is connected with the printing platform 2. The lifting driving mechanism is used to drive the printing platform 2 to lift. The arrangement of the lifting driving mechanism can realize the lifting of the printing platform 2 and facilitate the automatic layer-by-layer printing of the printing sample. The structure of the specific lifting driving mechanism belongs to the conventional technology, which is not limited herein.

[0058] In some embodiments, the printing sample is directly separated from the release film by driving the printing platform 2 to lift through the lifting driving mechanism. Specifically, the printing platform 2 is driven to move downward by a certain distance through the lifting driving mechanism, so that the printing sample is separated from the release film, and then the printing platform 2 is driven to move upward by a certain distance through the lifting driving mechanism. It should be noted that, in order to facilitate the separation of the printing sample from the release film, the downward movement distance is usually greater than the distance between the printing sample and the release film during exposure, so the printing platform 2 needs to move upward by a certain distance. When the printing platform 2 moves to the position, the subsequent printing process is performed.

[0059] In other embodiments, the driving component 312 can drive the flipping component 311 to flip the film stretching component 32 upward, thereby separating the release film and the printed sample in the film stretching component 32.

[0060] Optionally, such as Figure 1 As shown, the opening of the material pool 1 is provided with a limiting stop 10, and the tensioning frame can be placed horizontally on the limiting stop 10. The limiting stop 10 is configured to provide horizontal limiting support for the tensioning frame and prevent the tensioning frame from rotating excessively downward.

[0061] Preferably, the limiting stop 10 is arranged circumferentially along the inner wall of the material pool 1, and the size of the shape enclosed by the limiting stop 10 is smaller than the size of the tensioning frame. The above arrangement can effectively limit the tensioning frame around its entire circumference through the limiting stop 10, while not affecting the photopolymerization printing operation.

[0062] Optionally, the angle at which the tensioning frame flips upward can be positioned by setting a positioning mechanism to improve work efficiency. The specific positioning structure is not limited here, as long as it can stop the tensioning frame at the maximum angle of upward flip.

[0063] like Figure 1 As shown, the printing platform 2 includes a stage 21 and a support 22. The stage 21 is ergonomically positioned within the material tank 1 and located below the film stretching assembly 32. One end of the support 22 is connected to the stage 21, and the other end extends out of the material tank 1 and is connected to the lifting drive mechanism. The stage 21 is used to hold the printed sample, and the support 22 is used to support the stage 21 and transmit the lifting movement of the lifting drive mechanism to the stage 21.

[0064] In this embodiment, as Figure 1 The material tank 1 includes a printing area 11 and an extension area 12. The extension area 12 is located on one side of the printing area 11 and is connected to the printing area 11. One end of the stage 21 extends into the printing area 11, and the film stretching frame is correspondingly located within the printing area 11. The support 22 is located in the extension area 12 and is connected to the other end of the stage 21. The support 22 extends out of the material tank 1 at the extension area 12 and is connected to the lifting drive mechanism. The printing area 11 of the material tank 1 is used to print samples, and the extension area 12 is used to accommodate and install the support 22, so that both ends of the support 22 can be connected to the stage 21 and the lifting drive mechanism respectively. This allows the lifting drive mechanism to drive the stage 21 to move up and down via the support 22, completing the automated layer-by-layer printing of the sample.

[0065] The workflow of a 3D printing device:

[0066] In the initial state, the membrane frame is placed horizontally on the limiting stop 10 of the material pool 1.

[0067] Step 1: Bubble removal: the driving motor 3122 is started to drive the membrane stretching assembly 32 to rotate upward to the state that the release film in the membrane stretching assembly 32 is separated from the printing liquid surface by the linkage shaft 3123 and the turnover assembly 311, and the two are at a preset angle (see Figure 1 and Figure 2 ), so as to drive the bubbles to the non-printing area; after a certain time, the membrane stretching assembly 32 is driven to rotate downward to the horizontal state (see Figure 3 and Figure 4 ) by the linkage shaft 3123 and the turnover assembly 311, so that the release film in the membrane stretching assembly 32 gradually contacts the printing liquid surface to avoid the re-generation of bubbles;

[0068] Step 2: solidification printing: start exposure, and turn off the curing light source after the exposure is completed;

[0069] Step 3: release: the lifting driving mechanism drives the stage 21 to descend by a preset height to make the printing layer of the printing sample separate from the lower surface of the release film, and then the lifting driving mechanism drives the stage 21 to ascend to a preset printing height;

[0070] Repeat steps 1-3 above.

[0071] It should be noted that:

[0072] In step 1, the inclination angle of the membrane stretching assembly 32 is not specifically limited here, and can be adjusted according to the specific use, as long as the bubbles in the printing liquid attached to the lower surface of the release film can flow downward along the release film to the non-printing area during the inclination of the membrane stretching assembly 32.

[0073] Compared with the way of removing the bubbles by the scraper which cannot remove the small bubbles, the application drives the membrane stretching assembly 32 to turn over by the turnover driving mechanism 31, so that the bubbles in the printing liquid attached to the lower surface of the release film can flow downward along the release film to the non-printing area; during the process of turning over the membrane stretching assembly 32 to the horizontal state, the release film and the printing liquid in the inclined membrane stretching assembly 32 gradually contact, avoiding the re-generation of bubbles between the release film and the printing liquid, effectively avoiding the interference of the bubbles, and also avoiding the scratch of the release film, and the application sets the turnover angle after assembling the turnover driving mechanism 31 and the membrane stretching assembly 32, so as to realize the effect of driving the bubbles to the non-working area to avoid the interference of the bubbles, which is simple to operate.

[0074] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, various obvious changes, re-adjustments and replacements can be made without departing from the protection scope of the present application. Here, it is not necessary and also impossible to enumerate all the implementation modes. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application claim.

Claims

1. A film turning driving mechanism applied to a 3D printing device, the 3D printing device comprising a material pool (1) and a printing platform (2), the material pool (1) being used for containing a printing material liquid; the printing platform (2) extending into the material pool (1) and being used for carrying a printing sample, characterized in that, The film turning driving mechanism comprises: A film turning driving mechanism (31) and a film stretching assembly (32) provided with a release film, the film stretching assembly (32) is rotatably arranged at a pool opening position of the pool (1), the film stretching assembly (32) is connected with an output end of the film turning driving mechanism (31), and the film turning driving mechanism (31) is used for driving the film stretching assembly (32) to rotate at the pool opening position to switch between an inclined state and a horizontal state.

2. The film inversion drive mechanism of claim 1, wherein, The film turning driving mechanism (31) comprises: A driving assembly (312), an output end of the driving assembly (312) is in transmission connection with the film stretching assembly (32), and the driving assembly (312) is capable of driving the film stretching assembly (32) to turn over.

3. The film inversion drive mechanism of claim 2, wherein, The film turning driving mechanism (31) further comprises: A turning assembly (311), the turning assembly (311) comprises a turning part (3111), an output end of the driving assembly (312) is connected with the film stretching assembly (32) through the turning part (3111), and the driving assembly (312) is used for driving the turning part (3111) to rotate to drive the film stretching assembly (32) to turn over.

4. The film inversion drive mechanism of claim 3, wherein, The turning assembly (311) further comprises: A fixing part (3113), the fixing part (3113) is fixedly arranged opposite to the pool (1), and the turning part (3111) is rotatably arranged on the fixing part (3113).

5. The film inversion drive mechanism of claim 4, wherein, The turning assembly (311) further comprises: A mounting bracket (3112), the mounting bracket (3112) is capable of being mounted on the pool (1), and the fixing part (3113) is mounted on the mounting bracket (3112).

6. The film inversion drive mechanism of claim 3, wherein, The driving assembly (312) comprises: A fixing bracket (3121); A driving motor (3122) mounted on the fixing bracket (3121), and the driving motor (3122) is connected with the turning part (3111) through a linkage shaft (3123).

7. The film inversion drive mechanism of any of claims 1-6, wherein, The film stretching assembly (32) comprises: A stretching frame, the stretching frame is connected with an output end of the film turning driving mechanism (31), the release film is mounted on the stretching frame, and the stretching frame is used for stretching the release film.

8. The film inversion drive mechanism of claim 7, wherein, A through hole (321) is arranged at a center position of the stretching frame, and the release film is arranged opposite to the through hole (321).

9. The film inversion drive mechanism of any of claims 1-6, wherein, A rotation angle range of the film stretching assembly (32) is 0-90°.

10. The film inversion drive mechanism of claim 9, wherein, A rotation angle range of the film stretching assembly (32) is 0-30°.

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