Mechanical structure for quick replacement of liquid crystal screen and 3D printer

Abstract

The application discloses a mechanical structure for quickly replacing a liquid crystal screen and a 3D printer. The mechanical structure comprises a bottom plate and a pressing ring. The bottom plate is provided with a first mounting position, a second mounting position and a boss. The liquid crystal screen is mounted on the first mounting position, and the pressing ring is mounted on the second mounting position. The pressing ring locks the liquid crystal screen on the first mounting position. The 3D printer comprises a rack, a lifting module, a printing platform, a resin tank, a light source and the mechanical structure. The mechanical structure is located above the light source and separates the resin tank from the inside of the 3D printer through the mechanical structure. The quick replacement of the liquid crystal screen is realized through the detachable connection between the pressing ring and the bottom plate. Meanwhile, the boss is located between the first mounting position and the second mounting position, and the mechanical structure separates the resin tank from the inside of the 3D printer. When the resin accidentally penetrates into the mechanical structure, the boss can block the resin from entering the first mounting position, preventing the resin from continuing to penetrate downward and affecting the 3D printer.

Description

Technical Field

[0001] This invention relates to the field of 3D printing, and more particularly to a mechanical structure for an LCD printer and a 3D printer using this mechanical structure. Background Technology

[0002] LCD printing is a relatively new 3D printing technology. A light source shines from bottom to top through an LCD screen to form a pattern, which is then projected onto the resin between the molding substrate and the bottom of the resin tank, causing the resin to solidify on the molding substrate. The molding substrate is immersed in the resin, which is stored in the resin tank, which is placed on the LCD screen. A transparent, flexible release film on the bottom of the resin tank is attached to the upper surface of the LCD screen. After printing multiple layers, the final product is obtained. After each layer is printed, the molding substrate needs to be raised and lowered to allow the resin to flow back, and the LCD screen will switch to display the pattern of the next layer.

[0003] Existing LCD printers typically mount the imaging LCD screen on a base plate, upon which a resin tank is placed. The LCD screen is usually glued to the base plate, with only the lower edge of the screen connecting to the base plate. This results in inconsistent adhesion and unstable bond strength, increasing the risk of the LCD screen loosening after prolonged printing. Furthermore, since high-powered ultraviolet light is often required for resin curing, this light can damage the LCD screen, causing it to age prematurely. In addition to ultraviolet light, the LCD screen also needs to withstand the high temperatures of the exposure mechanism. Therefore, the LCD screen is a consumable component in 3D printers, with a typically short lifespan, requiring frequent replacement. The aforementioned installation method makes LCD screen replacement and disassembly difficult, residue removal challenging, and the replacement process cumbersome, with a risk of leakage. Therefore, it requires professional personnel to operate.

[0004] In addition, during operation, the rising of the molding substrate causes the release film in the resin tank to deform upwards. The release film and the LCD screen are vacuum-adhered, and there is no fixing means above the LCD screen. Under the vacuum adsorption, the LCD screen is also subjected to an upward traction force, which makes it easy to loosen or tilt, thereby affecting its level as a reference and thus significantly reducing the printing accuracy. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention first provides a mechanical structure for quickly replacing an LCD screen. A first mounting position, a second mounting position, and a boss are provided on a base plate. The LCD screen is mounted on the first mounting position, and a pressure ring is mounted on the second mounting position, locking the LCD screen to the first mounting position. The boss is located between the first and second mounting positions. If resin accidentally leaks into this mechanical structure, the boss can prevent the resin from entering the first mounting position, preventing further leakage and potential impact on the 3D printer.

[0006] Furthermore, a 3D printer is provided in which the aforementioned mechanical structure is mounted on the frame. This mechanical structure is located above the light source and separates the resin tank from the interior of the 3D printer through this mechanical mechanism. This facilitates the replacement of the LCD screen while preventing resin that may accidentally leak from the resin tank from entering the interior of the 3D printer.

[0007] The technical solution of this invention is implemented as follows:

[0008] A mechanical structure for quick replacement of LCD screens, comprising:

[0009] The base plate is configured as the main support of the mechanical structure. A window is opened on the base plate. A first mounting position for installing an LCD screen is provided on the outer periphery of the window. An annular boss is provided on the outer side of the first mounting position. The boss is configured to prevent resin from entering the first mounting position. A second mounting position is also provided on the outer side of the boss.

[0010] A retaining ring is used to lock the LCD screen in a first mounting position. The retaining ring is detachably mounted on a second mounting position on the base plate, and the retaining ring crosses the boss to remain in place when mounted.

[0011] In this design, the LCD screen is no longer fixed to the base plate using adhesive or other methods. Instead, it is detachably connected via a mechanical mounting method using a pressure ring. When the LCD screen ages, the pressure ring can be directly removed, and the LCD screen can be taken out from the first mounting position for easy replacement. This makes LCD screen replacement convenient, eliminates the need to clean residual adhesive, and simplifies the replacement process, requiring no professional personnel. Furthermore, the pressure ring locks the LCD screen from top to bottom, ensuring it remains stable even under vacuum created by the release film, thus maintaining good operational stability. In addition, the boss positioned between the first and second mounting positions prevents resin from accidentally seeping into the mechanical structure, blocking it from the first mounting position and preventing further leakage that could affect the printer. The boss also provides mounting limits for both the LCD screen and the pressure ring, facilitating their installation. Therefore, both LCD screen installation and removal are more convenient, faster, and easier to operate.

[0012] As a preferred option:

[0013] The pressure ring includes an outer ring portion and an inner ring portion;

[0014] The outer ring is located in the second mounting position, and the outer ring is configured to be detachably mounted to the second mounting position;

[0015] When the pressure ring is in the installation state, the inner ring portion is above the boss, and the other portion of the inner ring is in the first installation position.

[0016] The inner and outer rings of the pressure ring have distinct functions. The outer ring is used for detachable connection with the base plate, and the inner ring extends inward into the first mounting position to lock the LCD screen in the first mounting position.

[0017] As a preferred option:

[0018] The inner ring protrudes upward from the upper surface of the outer ring, and the inner ring is thinned to form a locking position. The locking position rests on the upper surface of the protrusion, and the other part of the locking position is configured to press the LCD screen into the first mounting position.

[0019] The shape of the pressure ring is not a simple flat plate, but has certain height variations and bends, similar to a step. The inner ring is on a higher horizontal plane than the outer ring, so as to lock the LCD screen over the protrusion. Specifically, the pressure ring locks the LCD screen from top to bottom through the locking position formed by the inner ring, preventing the LCD screen from being loosened by upward force, thus solving the problem of LCD screen locking.

[0020] As a preferred option:

[0021] The LCD screen, after being placed in the first mounting position, is attached to the inner side of the protrusion, and the upper surface of the LCD screen is higher than the upper surface of the protrusion.

[0022] Because the inner ring of the pressure ring is thinned upwards and there is a locking position, if the upper surface of the LCD screen is lower than the upper surface of the protrusion, the pressure ring cannot lock the LCD screen, and the LCD screen may still move inside, which will have an adverse effect on the printing work.

[0023] As a preferred option:

[0024] The pressure ring is a ring frame;

[0025] The lower surface of the pressure ring is also provided with an annular light-shielding film, which is at least partially configured to be installed on the edge of the upper surface of the LCD screen.

[0026] The light-blocking film blocks light that may be refracted / scattered from the edge of the LCD screen. This unexpected light may change the light intensity in some areas, causing overexposure in some parts of the 3D model surface, resulting in a rough surface and texture on the 3D printed model. In addition, this unexpected light may cause the resin to cure unexpectedly, thus producing debris. If the debris is suspended in the resin, it may lead to printing failure, damage to the release film, and other problems.

[0027] As a preferred option:

[0028] The liquid crystal screen includes an LCD screen and a glass backing plate;

[0029] An LCD screen, located above a glass pad, is configured to image 3D printing.

[0030] The upper surface of the glass pad is higher than or equal to the upper surface of the boss. The glass pad includes:

[0031] The support is located in the vertical projection area of ​​the LCD screen (21) and is configured to support the LCD screen;

[0032] The locking part is located on the outer periphery of the vertical projection area of ​​the LCD screen and is configured to be at least partially pressed by the locking position of the pressure ring.

[0033] The LCD screen needs to function, so it is more reasonable for the pressure ring to press against the glass pad; the locking part can be partially or completely locked by the pressure ring.

[0034] As a preferred option:

[0035] The height of the upper surface of the inner ring of the pressure ring shall not exceed the height of the upper surface of the LCD screen.

[0036] As the base surface for 3D printing, the LCD screen needs to be in direct contact with the resin tank. If it is lower than the height of the inner ring of the pressure ring, it will be suspended from the bottom of the resin tank, which will seriously affect the printing effect. Therefore, it is necessary for the upper surface of the LCD screen to be higher than the upper surface of the pressure ring so that the release film at the bottom of the resin tank can better adhere to the LCD screen.

[0037] As a preferred option:

[0038] The outer periphery of the window is a stepped mounting portion, and both the first mounting position and the second mounting position are located within the mounting portion;

[0039] The mounting section also includes a third mounting position and a fourth mounting position;

[0040] The third mounting position is located between the first mounting position and the window, and is configured to mount a Fresnel lens;

[0041] The fourth mounting position is located outside the second mounting position and is configured to mount the resin tank.

[0042] Fresnel lenses are used to recalibrate the scattered light path emitted by a light source into direct light.

[0043] As a preferred option:

[0044] The upper surface of the LCD screen is higher than the mounting plane of the fourth mounting position, thereby configuring it to lift the release film at the bottom of the resin tank upward to make the release film taut.

[0045] The LCD screen and pressure ring protrude upwards from the fourth mounting position, which can lift the flexible release film under the resin tank, thereby tightening it and improving the accuracy of the model.

[0046] As a preferred option:

[0047] The third mounting position to the first mounting position has a stepped rise and a first step is formed, the first step being configured to limit the Fresnel lens;

[0048] The second mounting position and the fourth mounting position have a stepped rise and a second step is formed, the second step being configured to limit the resin tank.

[0049] The first and second steps facilitate the installation and fixation of the Fresnel lens and the resin tank.

[0050] As a preferred option:

[0051] The mounting plate is installed under the base plate by screws; the LCD screen includes a ribbon cable for electrical connection, and the inner side of the boss has a ribbon cable hole that runs vertically through it, through which the ribbon cable passes and is inserted into the mounting plate.

[0052] The ribbon cable is positioned with a cable hole on the inside of the boss, which effectively prevents resin leakage from contaminating the ribbon cable and affecting the normal operation of the LCD screen. The original horizontal arrangement of the ribbon cable has been changed to a vertical arrangement, so that the LCD screen is pressed down by the pressure ring without affecting the ribbon cable, making the structure more reasonable.

[0053] A 3D printer includes the aforementioned quick-change LCD screen mechanical structure, and:

[0054] The frame is configured to support the main body of the 3D printer;

[0055] The lifting module is mounted on the frame and is configured to drive the printing platform to reciprocate up and down.

[0056] The printing platform is set on the lifting module and is configured so that the model to be printed is formed on the printing platform;

[0057] A resin tank, configured for storing resin;

[0058] The light source is mounted on the rack and is configured to emit light upwards.

[0059] The mechanical structure is mounted on the frame and is located above the light source, with the resin tank mounted on the mechanical structure.

[0060] The design starting point, concept, and beneficial effects of the present invention, which adopts the above technical solution, are as follows:

[0061] In this design, the LCD screen is no longer fixed to the base plate using adhesive or other methods. Instead, it is detachably connected via a mechanical mounting method using a pressure ring. When the LCD screen ages, the pressure ring can be directly removed, and the LCD screen can be taken out from the first mounting position for easy replacement. This makes LCD screen replacement convenient, eliminates the need to clean residual adhesive, and simplifies the replacement process, requiring no professional personnel. Furthermore, the pressure ring locks the LCD screen from top to bottom, ensuring it remains stable even under vacuum created by the release film, thus maintaining good operational stability. In addition, the boss positioned between the first and second mounting positions prevents resin from accidentally seeping into the mechanical structure, blocking it from the first mounting position and preventing further leakage that could affect the printer. The boss also provides mounting limits for both the LCD screen and the pressure ring, facilitating their installation. Therefore, both LCD screen installation and removal are more convenient, faster, and easier to operate. Attached Figure Description

[0062] Figure 1 This is an exploded view of the mechanical structure in an embodiment of the present invention;

[0063] Figure 2 This is a three-dimensional structural diagram of the LCD 3D printer in an embodiment of the present invention;

[0064] Figure 3 This is a three-dimensional structural diagram of the base plate in an embodiment of the present invention;

[0065] Figure 4 This is a schematic diagram of the three-dimensional structure of the pressure ring in an embodiment of the present invention. Figure 1 ;

[0066] Figure 5 This is a schematic diagram of the three-dimensional structure of the pressure ring in an embodiment of the present invention. Figure 2 ;

[0067] Figure 6 This is a three-dimensional structural diagram of the mechanical structure after assembly in an embodiment of the present invention;

[0068] Figure 7 This is a cross-sectional view of the mechanical structure in an embodiment of the present invention;

[0069] Figure 8 for Figure 7 A magnified view of a portion of the image;

[0070] Figure 9 This is a three-dimensional structural diagram of the glass pad in an embodiment of the present invention.

[0071] The reference numerals in the attached drawings are as follows: base plate 1; LCD screen 2; LCD screen 21; glass pad 22; support part 221; locking part 222; pressure ring 3; outer ring part 31; inner ring part 32; locking position 33; window 4; mounting part 5; first mounting position 51; second mounting position 52; third mounting position 53; fourth mounting position 54; boss 6; frame 7; exposure mechanism 8; resin tank 9; molding substrate 10; printing platform 11; lifting module 12; light shielding film 13; Fresnel lens 14; fixing plate 15; countersunk screw 16; ribbon cable 17; ribbon cable hole 18; hook 19. Detailed Implementation

[0072] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0073] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0074] In the description of this invention, the term "at least one" means one or more, unless otherwise expressly defined. The terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0075] The specific embodiments of the present invention are as follows:

[0076] like Figure 1 , 6 As shown, the present invention provides a mechanical structure for quickly replacing an LCD screen, including a base plate 1, an LCD screen 2, and a pressure ring 3. The base plate 1 is configured as the main support of the mechanical structure. A window 4 for light to enter is provided on the base plate 1. A first mounting position 51 for mounting the LCD screen 2 is provided around the window 4. An annular boss 6 is provided on the outer side of the first mounting position 51. A second mounting position 52 for mounting the pressure ring 3 is also provided on the outer side of the boss 6. The LCD screen 2 is placed on the first mounting position 51 of the base plate 1. The pressure ring 3 is fixedly mounted on the second mounting position 52 of the base plate 1 by screws and passes over the boss 6 to lock the LCD screen 2 in the first mounting position 51. The boss 6 is configured to prevent resin from entering the machine.

[0077] In this design, the LCD screen 2 is no longer fixed to the base plate 1 using adhesive or other means. Instead, it is detachably connected via a mechanical installation method using a locking ring 3. After the LCD screen 2 ages, the locking ring 3 can be directly removed, and the LCD screen 2 can be taken out from the first mounting position 51 for easy replacement. This makes the replacement and disassembly of the LCD screen 2 convenient, eliminating the need to clean residual adhesive and simplifying the replacement process without requiring professional personnel. Furthermore, the locking ring 3 locks the LCD screen 2 from top to bottom, ensuring that the LCD screen 2 will not loosen even under vacuum adsorption generated by the release film, thus maintaining good operational stability. Additionally, the resin in the resin tank 9 poses a risk of leakage. There is a possibility that resin material may leak from the resin tank 9 due to damage to the release film or improper operation. In this case, disassembling the LCD screen 2 will cause the leaked resin to flow along the base plate 1 into the window 4 and then drip into the machine. The boss 6 is located between the first mounting position 51 and the second mounting position 52. Even if the resin accidentally seeps into the mechanical structure, the boss 6 can block the resin outside the first mounting position 51 to prevent the resin from continuing to seep downward and affecting the printer. At the same time, the boss 6 can also provide installation limits for the LCD screen 2 and the pressure ring 3, making it easier to install both. Therefore, disassembling and assembling the LCD screen 2 is more convenient, faster and easier to operate.

[0078] Specifically, such as Figure 1 , 2 As shown, this mechanical structure is used in an LCD 3D printer. These printers typically use a downward-facing light source arrangement. It includes a frame 7, an exposure mechanism 8 (i.e., the light source), a resin tank 9, a printing platform 11, a lifting module 12, and the aforementioned mechanical structure. The frame 7 serves as the main support for the printer, used to mount other components. The exposure mechanism 8 is the light source in the 3D printer, mounted on the lower part of the frame 7 and capable of emitting light upwards. The lifting module 12 is vertically positioned with the printing platform 11 mounted on it. The printing platform 11 includes a molding substrate 10 located below it. The lifting module 12 drives the printing platform 11 and the molding substrate 10 to rise and fall, forming the model on the molding substrate 10. The resin tank 9 is placed on the mechanical structure, and resin material is poured into the resin tank 9. The mechanical structure is mounted on the frame 7 and is located above the exposure mechanism 8 and below the molding substrate 10.

[0079] The mechanical structure also includes a light-shielding film 13, a Fresnel lens 14, and a fixing plate 15; such as Figure 3As shown, the base plate 1 has a stepped mounting portion 5 around the window 4. The first mounting position 51 and the second mounting position 52 are both located within the mounting portion 5. The mounting portion 5 also includes a third mounting position 53 and a fourth mounting position 54. The third mounting position 53 is located between the first mounting position 51 and the window 4 and is configured to mount the Fresnel lens 14. The fourth mounting position 54 is located outside the third mounting position 53 and is configured to mount the resin tank 9. A stepped rise is formed between the third mounting position 53 and the first mounting position 51, and the first step is configured to limit the Fresnel lens 14. A stepped rise is also formed between the second mounting position 52 and the fourth mounting position 54, and the second step limits the resin tank 9. The height of the upper surface of the third mounting position 53 is lower than that of the upper surface of the first mounting position 51, and the height of the upper surface of the second mounting position 52 is lower than that of the upper surface of the fourth mounting position 54. The boss 6 is located between the first mounting position 51 and the second mounting position 52, and the height of the upper surface of the second mounting position 52 is higher than that of the upper surface of the first mounting position 51. Therefore, in the mounting part 5, from bottom to top and from inside to outside, the third mounting position 53, the first mounting position 51, the second mounting position 52 and the fourth mounting position 54 are installed in sequence, and the Fresnel lens 14 (at the third mounting position 53), the liquid crystal screen 2 (at the first mounting position 51), the pressure ring 3 (at the second mounting position 52) and the resin tank 9 (at the fourth mounting position 54) are installed in sequence.

[0080] like Figure 4 , 5 As shown, the pressure ring 3 is an annular frame, including an outer ring 31 and an inner ring 32. The outer ring 31 is located in the second mounting position 52 and is detachably connected to the second mounting position 52. The inner ring 32 protrudes upward from the upper surface of the outer ring 31 and the lower surface of the inner ring 32 is thinned upward to form a locking position 33. The LCD screen 2 is located between the first mounting position 51 and the locking position 33. The inner ring 32 is located above the boss 6 and the edge of the LCD screen 2, and the inner ring 32 presses the LCD screen 2 tightly in the first mounting position 51. The middle of the pressure ring 3 is hollowed out to allow rays to pass through. The outer ring 31 and the inner ring 32 of the edge frame can be used to install themselves and lock the LCD screen 2. The shape of the pressure ring 3 is not a simple flat plate, but has certain height changes and bends, similar to a step. The horizontal plane of the inner ring 32 is higher than that of the outer ring 31, so as to pass over the boss 6 to lock the LCD screen 2.

[0081] like Figure 7As shown, an annular light-shielding film 13 is provided below the pressure ring 3. The light-shielding film 13 is pasted on the edge of the LCD screen 2 and locked to the base plate 1 together with the pressure ring 3 by screws. The screws are countersunk screws. The light-shielding film 13 is used to block the light that may be exposed at the edge of the LCD screen 2, which can make the model more accurate. The use of countersunk screws 16 can make the upper surface of the pressure ring 3 as flat as possible. After the LCD screen 2 is placed in the first mounting position 51, it is close to the side of the boss 6 and the LCD screen 2 is higher than the boss 6. The light-shielding film 13 is flexible. After it is deformed, it can fit the surface of the LCD screen 2, the boss 6 and the second mounting position 52.

[0082] like Figure 8 , 9 As shown, the LCD screen 2 and the pressure ring 3 protrude upwards from the fourth mounting position 54; the upward protrusion of the LCD screen 2 and the pressure ring 3 from the fourth mounting position 54 can lift the flexible release film (not shown) at the bottom of the resin tank 9, thereby tightening it, which is beneficial to improve the model accuracy. Moreover, the height of the upper surface of the inner ring of the pressure ring does not exceed the height of the upper surface of the LCD screen, which allows the release film at the bottom of the resin tank to better adhere to the LCD screen; the LCD screen 2 includes an LCD screen 21 and a glass pad 22, the glass pad 22 is located below the LCD screen 21 and the edge of the glass pad 22 protrudes from the LCD screen. The edge of the screen 21 and the edge of the glass pad 22 protrude 3-5mm beyond the edge of the LCD screen 21, which is 4mm in this embodiment; that is, the glass pad 22 includes a support part 221 and a locking part 222. The support part 221 is located in the vertical projection area of ​​the LCD screen 21 and is configured to support the LCD screen 21. The locking part 222 is located on the outer periphery of the vertical projection area of ​​the LCD screen and is configured to be at least partially pressed by the locking position 33 of the pressure ring 3. When locking the LCD screen 2, the pressure ring 3 is pressed on the glass pad 22, which will not affect the LCD screen 21 and its operation, which is more reasonable.

[0083] In addition, such as Figure 1 , 7 As shown, the fixing plate 15 is installed below the base plate 1 by screws; the LCD screen 2 includes a ribbon cable 17 for electrical connection, and the boss 6 is provided with a ribbon cable hole 18 that runs vertically through it. The ribbon cable 17 passes through the ribbon cable hole 18 and is inserted into the fixing plate 15; the fixing plate 15 is provided with two hooks 19 for inserting the ribbon cable 17, one on the left and one on the right, which are fixed to the fixing plate 15 respectively, and the ribbon cable 17 is inserted into the hooks 19; in this solution, the original horizontal arrangement of the ribbon cable 17 is changed to a vertical arrangement, so that the LCD screen 2 is pressed by the pressure ring 3 without affecting the ribbon cable 17, and the structure is more reasonable.

[0084] During installation, first install the mounting plate 15 onto the base plate 1 from bottom to top using screws. Then, place the Fresnel lens 14 from top to bottom in the third mounting position 53. Next, place the LCD screen 2 from top to bottom into the first mounting position 51. Insert the ribbon cable 17 of the LCD screen 2 into the hook 19 of the mounting plate 15 through the ribbon cable hole 18. Connect the data cable to the corresponding interface of the ribbon cable 17. Then, stick the light-shielding film 13 to the edge of the LCD screen 2. Install the pressure ring 3 from top to bottom into the second mounting position 52. Finally, secure and lock it with countersunk screws 16.

[0085] When replacing the LCD screen 2, simply remove the retaining ring 3, peel off the light-blocking film 13, lift the LCD screen 2 upwards appropriately, and the ribbon cable 17 will disengage from the hook 19. After unplugging the data cable, the LCD screen disassembly is complete. The process is simple and easy to operate.

Claims

1. A mechanical structure for quickly replacing an LCD screen, characterized in that, include: The base plate (1) is configured as the main support of the mechanical structure. A window (4) is provided on the base plate. A first mounting position (51) for installing an LCD screen is provided on the outer periphery of the window (4). An annular boss (6) is provided on the outer side of the first mounting position (51). The boss (6) is configured to prevent resin from entering the first mounting position (51). A second mounting position (52) is also provided on the outer side of the boss (6). A retaining ring (3) is used to lock the LCD screen in the first mounting position (51). The retaining ring (3) is detachably mounted on the second mounting position (52) of the base plate, and the retaining ring crosses the boss (6) in the mounted state to keep it in place. The pressure ring (3) includes an outer ring portion (31) and an inner ring portion (32); The outer ring (31) is located in the second mounting position (52), and the outer ring (31) is configured to be detachably mounted to the second mounting position (52); When the pressure ring (3) is installed, the inner ring (32) is located above the boss (6), and the other part of the inner ring (32) is located in the first mounting position (51).

2. The mechanical structure for quick replacement of LCD screens according to claim 1, characterized in that: The inner ring (32) protrudes upward from the upper surface of the outer ring (31), and the inner ring (32) is thinned to form a locking position (33). Part of the locking position (33) rests on the upper surface of the boss (6), and the other part of the locking position (33) is configured to press the LCD screen into the first mounting position (51).

3. The mechanical structure for quick replacement of LCD screens according to claim 2, characterized in that, Also includes: The LCD screen (2) is placed in the first mounting position (51), and the LCD screen (2) is in contact with the inner side of the boss, and the upper surface of the LCD screen is higher than the upper surface of the boss.

4. The mechanical structure for quick replacement of LCD screens according to claim 3, characterized in that: The pressure ring (3) is an annular frame; The lower surface of the pressure ring (3) is also provided with an annular light-shielding film, which is at least partially configured to be installed on the edge of the upper surface of the LCD screen.

5. The mechanical structure for quick replacement of LCD screens according to claim 3, characterized in that: The liquid crystal screen (2) includes an LCD screen (21) and a glass backing plate (22); An LCD screen (21) is located above a glass pad (22) and is configured to image 3D printing. The upper surface of the glass pad is higher than or equal to the upper surface of the boss, and the glass pad (22) includes: The support (221) is located in the vertical projection area of ​​the LCD screen (21) and is configured to support the LCD screen (21); The locking part (222) is located on the outer periphery of the vertical projection area of ​​the LCD screen and is configured to be pressed at least partially by the locking position (33) of the pressure ring.

6. The mechanical structure for quick replacement of LCD screens according to claim 5, characterized in that: The height of the upper surface of the inner ring (32) of the pressure ring (3) does not exceed the height of the upper surface of the LCD screen (21).

7. The mechanical structure for quick replacement of LCD screens according to claim 3, characterized in that: The outer periphery of the window (4) is a stepped mounting part (5), and the first mounting position (51) and the second mounting position (52) are both located in the mounting part (5); The mounting section also includes a third mounting position (53) and a fourth mounting position (54); The third mounting position (53) is located between the first mounting position (51) and the window (4) and is configured to mount a Fresnel lens (14); The fourth mounting position (54) is located outside the second mounting position (52) and is configured to mount the resin tank.

8. The mechanical structure for quick replacement of LCD screens according to claim 7, characterized in that: The upper surface of the liquid crystal screen is higher than the mounting plane of the fourth mounting position (54), thereby configuring it to lift the release film at the bottom of the resin tank upward so that the release film is taut.

9. The mechanical structure for quick replacement of LCD screens according to claim 7, characterized in that: The third mounting position (53) to the first mounting position (51) has a stepped rise and a first step is formed, the first step being configured to limit the Fresnel lens (14); The second mounting position (52) and the fourth mounting position (54) have a stepped rise and a second step is formed, the second step being configured to limit the resin tank.

10. The mechanical structure for quick replacement of LCD screens according to claim 3, characterized in that, Also includes: The fixing plate (15) is installed below the base plate (1) by screws; the LCD screen (2) includes a ribbon cable (17) for electrical connection, and a ribbon cable hole (18) is opened on the inner side of the boss, through which the ribbon cable (17) passes and is inserted into the fixing plate (15).

11. A 3D printer, characterized in that, The mechanical structure for quick-change LCD screens as described in any one of claims 1 to 10 includes: The frame (7) is configured as the main support for the 3D printer; The lifting module (12) is mounted on the frame (7) and is configured to drive the printing platform to reciprocate up and down. A printing platform (11) is set on the lifting module (12), and the printing platform (11) is configured so that the model to be printed is formed on the printing platform (11); Resin tank (9), configured for storing resin; A light source (8) is mounted on a frame (7) and is configured to emit light upwards; The mechanical structure is mounted on the frame (7) and is located above the light source (8). The resin tank (9) is mounted on the mechanical structure.

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