Photocuring 3D printing equipment with pressure prevention device and printing pressure prevention method

Abstract

The invention discloses photocuring 3D printing equipment with an anti-pressing device and a printing anti-pressing method. A base and a supporting table are in contact or keep a preset distance in an initial state; the elastic element is arranged between the supporting table and the base and is used for generating elastic deformation under axial force and providing a deformation space for movement of the supporting table relative to the base; the elastic piece is arranged on the supporting table and / or the base and used for applying pre-tightening force in a preset direction to the supporting table so as to provide initial pressing force or reset tendency of the supporting table relative to the base; the sensing assembly is arranged between the supporting table and the base and used for detecting the relative displacement and / or the contact state between the supporting table and the base. Pressure prevention protection is converted into active interception from passive response, normal pressure and abnormal pressure are distinguished through quantifiable threshold setting, impact is buffered and absorbed through an elastic element, reliability is guaranteed through multiple sensing assemblies, and finally accurate detection, rapid shutdown and effective protection are achieved.

Description

[Technical Field]

[0001] This invention relates to the field of 3D printing, and in particular to a photopolymerization 3D printing device and a printing pressure-resistant method equipped with a pressure-resistant device. [Background Technology]

[0002] Currently available pull-type photopolymer 3D printing equipment faces significant risks of component damage due to overpressure in practical use. For example, when the equipment malfunctions due to mechanical failures (such as Z-axis motor step loss, excessive transmission backlash, guide rail jamming, limit switch failure, etc.), operational errors (such as uncalibrated starting position, improper leveling, or tilted material tank installation), or software logic defects (such as incorrect slicing path or excessively large layer thickness settings), the printing platform may abnormally descend; or, due to model detachment during printing or residual cured material / impurities in the material tank, objects on the platform may accidentally fall, both of which will compress the release film and the light-transmitting support plate (glass / LCD screen) at the bottom of the material tank. Existing technologies primarily employ passive protection schemes to address overpressure risks, which have significant limitations.

[0003] 1. Software limit relies on static coordinates: The machine stops by preset minimum Z-axis coordinates, but it cannot dynamically respond to the reaction force of liquid material in the tank or foreign object jamming, which easily leads to overtravel and squeezing. The platform continues to move down a certain distance after exceeding the limit before stopping.

[0004] 2. Single sensor is susceptible to interference: Using only contact sensors (such as microswitches) to detect the contact status between the platform and the trough is susceptible to interference from vibration and dust, resulting in false alarms. Furthermore, the response is delayed (the signal is output 10-50ms after contact), making it difficult to avoid damage caused by extrusion followed by shutdown.

[0005] 3. Lack of elastic buffering mechanism: Most devices do not have a buffer structure designed between the platform and the drive mechanism. When overpressure occurs, the impact force acts directly on the bottom components, which increases the risk of breakage of the release film and glass / LCD.

[0006] Therefore, this invention addresses the aforementioned problems. [Summary of the Invention]

[0007] This invention relates to a photopolymer 3D printing device and a printing pressure protection method equipped with a pressure protection device. Its core lies in the platform connection module—by transforming pressure protection from passive response to active interception, it distinguishes between normal and abnormal pressure with quantifiable threshold settings, uses elastic elements to buffer and absorb impacts, and relies on multiple sensing components to ensure reliability. Ultimately, it achieves accurate detection, rapid shutdown, and effective protection, effectively solving the pain points of existing technologies such as false triggering, delayed response, and impact damage, and significantly improving the reliability, lifespan, and user experience of pull-up photopolymer printing devices.

[0008] To address the aforementioned technical problems, this invention provides a photopolymerization 3D printing device equipped with an anti-pressure device, comprising:

[0009] Z-axis drive mechanism 1;

[0010] Platform connection module 2 is connected to the moving end of Z-axis drive mechanism 1 and can move along the axial direction of Z-axis drive mechanism 1;

[0011] Printing platform module 3, which is connected to and moves with platform connection module 2;

[0012] Material tank 4, which is used to contain photosensitive resin material;

[0013] A light-transmitting support plate 5 is disposed at the bottom of the material tank 4 and is used to transmit light and support the photosensitive resin material and release film in the material tank 4.

[0014] Substrate 6, which is used to fix and mount the material tank 4 and the light-transmitting support plate 5;

[0015] Exposure unit 7, located below substrate 6, is used to provide an exposure beam for curing photosensitive resin material;

[0016] The platform connection module 2 includes:

[0017] Support platform 206, which is used to support printing platform module 3;

[0018] The base 209 is in contact with or maintains a preset distance from the support platform 206 in the initial state.

[0019] An elastic element is provided between the support platform 206 and the base 209 to undergo elastic deformation when subjected to axial force, providing deformation space for the movement of the support platform 206 relative to the base 209.

[0020] Elastic element 204, which is provided on support platform 206 and / or base 209, is used to apply a preload force in a preset direction to support platform 206 to provide initial clamping force or reset tendency of support platform 206 relative to base 209.

[0021] A sensing component is disposed between the support platform 206 and the base 209 for detecting the relative displacement and / or contact state between the support platform 206 and the base 209.

[0022] When the printing platform module 3 is subjected to an upward reaction force during downward movement, and the reaction force causes the support platform 206 to overcome the preload and the initial reaction force of the elastic element and move and separate relative to the base 209, the sensing component generates a feedback signal to control the Z-axis drive mechanism 1 to stop working.

[0023] As described above, a photopolymerization 3D printing device with an anti-pressure device includes a sensing component comprising a first sensing element 212 and a first detection element 213. The first sensing element 212 is disposed on a base 209, and the first detection element 213 is disposed on a support platform 206. When the support platform 206 is not subjected to abnormal axial force, the first sensing element 212 and the first detection element 213 are in a sensing state. When the support platform 206 displaces relative to the base 209 in the opposite direction of the pre-tightening force and reaches a preset threshold, the relative position or sensing state of the first sensing element 212 and the first detection element 213 changes, thereby generating a first feedback signal; and / or, the sensing component includes a second sensing element 214, which is disposed on the support platform 206 or the base 209. On 09, a second feedback signal is generated when the contact state between the support platform 206 and the base 209 is detected directly or indirectly. When the two change from contact to separation, a second feedback signal is generated. When the printing platform module 3 is subjected to an upward reaction force during downward movement, and the reaction force is transmitted to the support platform 206 through the platform connection module 2, the resultant force on the support platform 206 in the opposite direction of the preload force is greater than the sum of the preload force of the elastic element 204, the weight of the support platform 206 itself, and the reaction force generated by the initial elastic deformation of the elastic element. When the support platform 206 overcomes the preload force and the initial preload force of the elastic element, moves and separates from the base 209 in the opposite direction of the preload force, triggering the sensing component to generate a feedback signal to control the Z-axis drive mechanism 1 to stop working.

[0024] As described above, in a photopolymerization 3D printing device with an anti-pressure device, the first sensing element 212 and the first detection element 213 are one or more combinations of photoelectric sensors, Hall sensors, inductive sensors or capacitive sensors; the second sensing element 214 is a micro switch or a contact sensor or a non-contact proximity switch.

[0025] As described above, in a photopolymerization 3D printing device equipped with an anti-pressure device, the platform connection module 2 further includes an upper cover plate 201, an upper pressure plate 203, a middle block 205, a lower pressure plate 208, a left side plate 210, and a right side plate 211. The upper cover plate 201 is directly or indirectly connected to the moving end of the Z-axis drive mechanism 1. The two sides of the upper cover plate 201 are connected to the two sides of the base 209 through the left side plate 210 and the right side plate 211. The middle block 205 is located between the upper cover plate 201 and the base 209. The elastic element includes an upper elastic sheet 202 and a lower elastic sheet 203. The upper elastic piece 202 is clamped at one end between the upper cover plate 201 and the upper end of the intermediate block 205, and at the other end between the upper pressure plate 203 and the support platform 206. The lower elastic piece 207 is clamped at one end between the base 209 and the lower end of the intermediate block 205, and at the other end between the lower pressure plate 208 and the support platform 206. The elastic element is located between the upper pressure plate 203 and the upper cover plate 201, and applies a downward preload force to the support platform 206 through the upper pressure plate 203.

[0026] In the photopolymerization 3D printing equipment described above, which has an anti-pressure device, the elastic element 204 is a compression spring.

[0027] As described above, in a photopolymerization 3D printing device with an anti-pressure device, the upper cover plate 201 has an adjustment hole opposite to the elastic member 204, and an adjustment member is connected in the adjustment hole to press against the elastic member 204 to adjust its preload.

[0028] As described above, in a photopolymerization 3D printing device with an anti-pressure device, the light-transmitting support plate 5 is provided with a liquid crystal display screen for modulating exposure images, and the exposure unit 7 is configured to provide only an exposure light source.

[0029] This invention also provides a pressure-resistant method for photopolymer 3D printing, applied to a photopolymer 3D printing device equipped with a pressure-resistant device as described above, comprising the following steps:

[0030] The Z-axis drive mechanism 1 drives the platform connecting module 2 and the printing platform module 3 to move downward along the Z-axis;

[0031] Real-time monitoring of the status between the support platform 206 and the base 209 in the platform connection module 2;

[0032] When the printing platform module 3 encounters an obstacle or abnormal overpressure during its downward movement, it generates an upward reaction force. When the reaction force causes the resultant force on the support platform 206 in the opposite direction of the preload to be greater than a preset threshold, the support platform 206 moves and separates from the base 209.

[0033] In response to the separation of the support platform 206 and the base 209, the sensing component is triggered to generate a feedback signal;

[0034] Based on the received feedback signal, the Z-axis drive mechanism 1 is controlled to stop working.

[0035] As described above, in a photopolymer 3D printing anti-pressure method, when the printing platform module 3 encounters an obstacle or abnormal overpressure during downward movement and generates an upward reaction force, and the reaction force causes the resultant force on the support platform 206 in the opposite direction of the pre-tightening force to be less than or equal to a preset threshold, the support platform 206 is fixed relative to the base 209 and does not trigger the sensing components to generate feedback signals.

[0036] As described above, in a photopolymerization 3D printing anti-pressure method, the preset threshold is the sum of the pre-tightening force of the elastic element 204, the weight of the support platform 206 itself, and the reaction force generated by the initial elastic deformation of the elastic element.

[0037] Compared with the prior art, the present invention has the following advantages:

[0038] 1. The platform connection module in this invention transforms the pressure protection from passive response to active interception, distinguishes between normal and abnormal pressure by setting quantifiable thresholds, uses elastic elements to buffer and absorb impacts, and relies on multiple sensing components to ensure reliability. Ultimately, it achieves accurate detection, rapid shutdown, and effective protection, effectively solving the pain points of false triggering, delayed response, and impact damage in existing technologies, and significantly improving the reliability, lifespan, and user experience of pull-up photopolymerization printing equipment.

[0039] 2. This invention provides protection both at the start of printing and during the printing process, effectively improving equipment reliability, printing success rate, and user experience. It serves as the core guarantee for the stable operation and long-term durability of pull-type photopolymer 3D printing equipment.

[0040] 3. In this invention, displacement state detection is achieved through the first sensing component and contact state detection is achieved through the second sensing component. This avoids false alarms or missed alarms caused by vibration, dust, and light interference from a single sensor, ensuring that shutdown is triggered only when there is actual overpressure, thus effectively improving detection accuracy and reliability.

[0041] 4. In order to accurately adjust the preload, the upper cover plate is provided with an adjustment hole opposite to the elastic element, and an adjustment element is connected in the adjustment hole to press against the elastic element to adjust the magnitude of its preload. [Attached Image Description]

[0042] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0043] Figure 1 This is a perspective view of the present invention.

[0044] Figure 2 This is a perspective view of the platform connection module and the printing platform module in this invention.

[0045] Figure 3 This is one of the exploded views of the platform connection module in this invention.

[0046] Figure 4 This is the second exploded view of the platform connection module in this invention.

[0047] Figure 5 This is a cross-sectional view of the platform connection module in this invention.

Detailed Implementation Methods

[0048] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0049] like Figure 1-5As shown, the present invention discloses a photopolymerization 3D printing device with an anti-pressure device, comprising: a Z-axis drive mechanism 1, a platform connection module 2, a printing platform module 3, a material tank 4, a light-transmitting support plate 5, a substrate 6, and an exposure unit 7. The Z-axis drive mechanism 1, substrate 6, and exposure unit 7 are respectively connected to the frame. The platform connection module 2 is connected to the moving end of the Z-axis drive mechanism 1 and can move along the axial direction of the Z-axis drive mechanism 1; the printing platform module 3 is connected to the platform connection module 2 and moves with it; the material tank 4 is used to contain photosensitive resin material; the light-transmitting support plate 5 is disposed at the bottom of the material tank 4, used to transmit light and support the photosensitive resin material and release film within the material tank 4; the substrate 6 is used to fix and install the material tank 4 and the light-transmitting support plate 5; the exposure unit 7 is located below the substrate 6 and is used to provide an exposure beam for curing the photosensitive resin material. The platform connection module 2 includes a support platform 206, a base 209, an elastic element, an elastic component 204, and a sensing assembly. The support platform 206 is used to support the printing platform module 3; the base 209 is in contact with the support platform 206 in the initial state or maintains a preset distance; the elastic element is disposed between the support platform 206 and the base 209, and is used to undergo elastic deformation when subjected to axial force, providing deformation space for the movement of the support platform 206 relative to the base 209; the elastic element 204 is disposed on the support platform 206 and / or the base 209, and is used to apply a preload force in a preset direction to the support platform 206 to provide the support platform 206 relative to the base 209. The initial clamping force or reset trend of the base 209; the sensing component is located between the support platform 206 and the base 209 to detect the relative displacement and / or contact state between the support platform 206 and the base 209; when the printing platform module 3 is subjected to an upward reaction force during downward movement, and the reaction force causes the support platform 206 to overcome the pre-tightening force and the initial reaction force of the elastic element and move and separate relative to the base 209, the sensing component generates a feedback signal to control the Z-axis drive mechanism 1 to stop working. In this invention, the platform connection module—by changing the anti-pressure protection from passive response to active interception, distinguishing between normal and abnormal pressure with quantifiable threshold settings, using elastic elements to buffer and absorb impacts, and ensuring reliability with multiple sensing components, ultimately achieves accurate detection, rapid shutdown and effective protection, effectively solving the pain points of false triggering, delayed response and impact damage in existing technologies, and significantly improving the reliability, lifespan and user experience of pull-up photopolymerization printing equipment.

[0050] This invention uses a combination of elastic element 204 and elastic components to set a clear anti-pressure trigger threshold, achieving precise control that prevents triggering under normal pressure and triggers under abnormal overpressure, effectively solving the problem of false triggering.

[0051] This invention achieves synchronous coverage of multiple scenarios through the unified anti-pressure logic of the platform connection module, as follows:

[0052] Protection during the initial printing stage: To prevent initial overpressure caused by factors such as incorrect starting position setting, improper leveling, tilted material tray installation, or malfunctioning bottom limit sensor, which could lead to the platform directly pressing the release film / glass / LCD at the bottom of the material tray, this invention uses threshold judgment between the support platform 206 and the base 209 to trigger the sensing component and stop the Z-axis drive mechanism 1 as soon as the printing platform module comes into contact with a foreign object at the bottom or gets abnormally close, thus avoiding irreversible damage from the initial pressure.

[0053] Printing process stage protection: In response to dynamic overpressure issues such as model detachment, motor step loss, residue / impurities in the material tank, and software logic defects, this invention uses the deformation buffer of elastic elements and real-time monitoring of sensing components to immediately trigger displacement and contact dual detection when the overpressure reaction force is transmitted to the support table. The first sensing component measures displacement, and the second sensing element 214 measures separation, quickly stopping the machine and avoiding chain damage caused by continuous pressure leading to glass / LCD breakage.

[0054] Therefore, this invention can protect the device at the start of printing and provide pressure protection during the printing process, effectively improving equipment reliability, printing success rate and user experience, and becoming the core guarantee for the stable operation and long-term durability of pull-type photopolymer 3D printing equipment.

[0055] Specifically, such as Figure 3 , 4 As shown, the sensing component includes a first sensing element 212 and a first detection element 213. The first sensing element 212 is disposed on the base 209, and the first detection element 213 is disposed on the support platform 206. The first sensing element 212 and the first detection element 213 are in a sensing state when the support platform 206 is not subjected to abnormal axial force. When the support platform 206 is displaced relative to the base 209 in the opposite direction of the preload force and reaches a preset threshold, the relative position or sensing state of the first sensing element 212 and the first detection element 213 changes, thereby generating a first feedback signal; and / or, the sensing component includes a second sensing element 214, which is disposed on the support platform 206 or the base 209, for direct or indirect use. The system detects the contact state between the support platform 206 and the base 209. When the two change from contact to separation, a second feedback signal is generated. When the printing platform module 3 is subjected to an upward reaction force during downward movement, and the reaction force is transmitted to the support platform 206 through the platform connection module 2, the resultant force on the support platform 206 in the opposite direction of the preload force is greater than the sum of the preload force of the elastic element 204, the weight of the support platform 206 itself, and the reaction force generated by the initial elastic deformation of the elastic element. At this point, the support platform 206 overcomes the preload force and the initial preload force of the elastic element, moves relative to the base 209 in the opposite direction of the preload force, and separates, triggering the sensing component to generate a feedback signal to control the Z-axis drive mechanism 1 to stop working.

[0056] To diversify the selection and adapt to various scenarios, and improve detection accuracy and anti-interference capabilities, the first sensing element 212 and the first detection element 213 are one or more combinations of photoelectric sensors, Hall sensors, inductive sensors or capacitive sensors; the second sensing element 214 is a micro switch or a contact sensor or a non-contact proximity switch.

[0057] like Figure 3-5 As shown, to improve the overall stability of the module and avoid off-center loading and deformation, the platform connection module 2 also includes an upper cover plate 201, an upper pressure plate 203, a middle block 205, a lower pressure plate 208, a left side plate 210, and a right side plate 211. The upper cover plate 201 is directly or indirectly connected to the moving end of the Z-axis drive mechanism 1. The two sides of the upper cover plate 201 are perpendicularly connected to the two sides of the base 209 through the left side plate 210 and the right side plate 211. The middle block 205 is perpendicularly connected between the upper cover plate 201 and the base 209. The elastic element includes an upper elastic sheet 202 and a lower elastic sheet 208. The elastic sheet 207 has one end clamped between the upper cover plate 201 and the upper end of the intermediate block 205, and the other end clamped between the upper pressure plate 203 and the support platform 206. The lower elastic sheet 207 has one end clamped between the base 209 and the lower end of the intermediate block 205, and the other end clamped between the lower pressure plate 208 and the support platform 206. The elastic element is located between the upper pressure plate 203 and the upper cover plate 201, and applies a downward preload force to the support platform 206 through the upper pressure plate 203. In this embodiment, the lower elastic sheet 207 and the upper elastic sheet form a symmetrical buffer – when the support platform moves, the upper and lower elastic sheets bend and deform synchronously, sharing the impact force and preventing overload breakage of one side of the elastic sheet, thus extending its service life.

[0058] In this embodiment, the platform connection module adopts a frame-type rigid structure to prevent off-center loading, layered elastic sheets for symmetrical buffering, elastic elements for close-range force transmission, and full clamping fixation for reliable operation. This design elevates the mechanical foundation of pressure protection from loose assembly to precision integration. It not only solves the pain points of structural deformation, uneven buffering, and force transmission loss in existing technologies, but also achieves high stability, high precision, and high durability of pressure protection through optimized spatial layout and adjustable preload. This provides a reliable guarantee for the safe operation of the pull-up type photopolymerization printing equipment throughout its entire lifecycle.

[0059] like Figure 5As shown, under normal circumstances, the downward pressure of the elastic element keeps the support platform 206 stably stopped on the base 209. The upper elastic plate 202, lower elastic plate 207, middle block 205, and support platform 206 are connected to form a parallelogram structure. The flexibility of the upper elastic plate 202 and lower elastic plate 207 allows the support platform 206 to move in the vertical direction. The gap between the upper cover plate 201 and the upper pressure plate 203 provides deformation space for the movement of the support platform 206 relative to the base 209. The parallelogram structure formed by the upper elastic plate 202, lower elastic plate 207, middle block 205, and support platform 206 effectively solves the problems of printing tilt, overpressure damage, and short lifespan in existing pull-type photopolymer 3D printers. Therefore, the printing quality, equipment stability, service life, and versatility of the equipment are improved, making it the core mechanical support structure of pull-type photopolymer 3D printers, especially suitable for high-precision, high-frequency, and multi-scenario industrial printing needs.

[0060] In order to accurately set the anti-pressure threshold, the elastic element 204 is a compression spring.

[0061] To precisely adjust the preload, the upper cover plate 201 has an adjustment hole opposite to the elastic element 204. An adjustment element (not shown in the figure) is connected within the adjustment hole to press against the elastic element 204 to adjust its preload. In some embodiments, the adjustment element may be an adjustment screw that is threaded to the adjustment hole, with the end of the adjustment screw pressing against the elastic element 204. The upper part of the elastic element 204 is placed within the adjustment hole and is protected and guided by it.

[0062] The light-transmitting carrier plate 5 is equipped with a liquid crystal display screen for modulating the exposure image, and the exposure unit 7 is configured to provide only the exposure light source. This embodiment, through a separate modular design, can effectively reduce maintenance costs and extend the life of core components; it can also improve imaging accuracy and printing quality; and the separate design avoids mutual interference between the light source and the modulation module through functional decoupling, thus enhancing system stability.

[0063] like Figure 1 , 2 As shown, the printing platform module 3 includes, but is not limited to, a platform support plate 31, a platform connector 33, and a printing platform 32. The platform support plate 31 is connected to the printing platform 32 through the platform connectors 33 on both sides. The relative angle between the printing platform 32 and the light-transmitting carrier plate 5 can be adjusted by the relative fixed position between the platform connectors 33 and the platform support plate 31. The printing platform module 3 is placed flat on the support platform 206 of the platform connection module 2 through the platform support plate 31 and can be fixed by tightening the screws by hand.

[0064] like Figure 2As shown, for easy adjustment, the platform connector 33 is provided with an adjustment elongated hole, the platform support plate 31 is provided with an adjustment connection hole, and an adjustment connector is inserted into both the adjustment connection hole and the adjustment elongated hole.

[0065] This invention provides a pressure-resistant method for photopolymer 3D printing, applied to a photopolymer 3D printing device equipped with a pressure-resistant device as described above, comprising the following steps:

[0066] The Z-axis drive mechanism 1 drives the platform connecting module 2 and the printing platform module 3 to move downward along the Z-axis;

[0067] Real-time monitoring of the status between the support platform 206 and the base 209 in the platform connection module 2;

[0068] When the printing platform module 3 encounters an obstacle or abnormal overpressure during its downward movement, it generates an upward reaction force. When the reaction force causes the resultant force on the support platform 206 in the opposite direction of the preload to be greater than a preset threshold, the support platform 206 moves and separates from the base 209.

[0069] In response to the separation of the support platform 206 and the base 209, the sensing component is triggered to generate a feedback signal to the host computer;

[0070] Based on the received feedback signal, the host computer controls the Z-axis drive mechanism 1 to stop working. The host computer used in this invention is conventional prior art and will not be described further here.

[0071] The anti-pressure method for photopolymer 3D printing of the present invention is applied to the above-mentioned photopolymer 3D printing equipment equipped with an anti-pressure device. Therefore, the anti-pressure method for photopolymer 3D printing of the present invention can protect the equipment at the start of printing and also provide anti-pressure protection during the printing process, effectively improving the reliability of the equipment, the printing success rate and the user experience, and becoming the core guarantee for the stable operation and long-term durability of the pull-type photopolymer 3D printing equipment.

[0072] Furthermore, when the printing platform module 3 encounters an obstacle or experiences abnormal overpressure during its downward movement, generating an upward reaction force, and the reaction force causes the resultant force on the support platform 206 in the opposite direction of the preload to be less than or equal to a preset threshold, the support platform 206 is fixed relative to the base 209, and the sensing components are not triggered to generate a feedback signal.

[0073] Specifically, the preset threshold is the sum of the preload of the elastic element 204, the weight of the support platform 206 itself, and the reaction force generated by the initial elastic deformation of the elastic element.

Claims

1. A light-cured 3D printing device with pressure protection device, characterized in that The application relates to a 3D printing device, comprising: a Z-axis driving mechanism (1); a platform connecting module (2) connected with the moving end of the Z-axis driving mechanism (1) and movable along the axial direction of the Z-axis driving mechanism (1); a printing platform module (3) connected with the platform connecting module (2) and movable with the platform connecting module (2); a tank (4) for containing photosensitive resin material; a light-transmitting bearing plate (5) arranged at the bottom of the tank (4) and used for transmitting light and bearing the photosensitive resin material and a release film in the tank (4); a base plate (6) for fixedly mounting the tank (4) and the light-transmitting bearing plate (5); an exposure unit (7) located below the base plate (6) and used for providing an exposure light beam for curing the photosensitive resin material; the platform connecting module (2) comprises: a support table (206) used for bearing the printing platform module (3); a base (209) in contact with the support table (206) or maintaining a preset interval in an initial state; an elastic element arranged between the support table (206) and the base (209) and used for elastically deforming when subjected to an axial force to provide a deformation space for the movement of the support table (206) relative to the base (209); an elastic member (204) arranged on the support table (206) and / or the base (209) and used for applying a preset direction pre-tightening force to the support table (206) to provide an initial compression force or a reset tendency of the support table (206) relative to the base (209); a sensing assembly arranged between the support table (206) and the base (209) and used for detecting the relative displacement and / or contact state between the support table (206) and the base (209); when the printing platform module (3) is subjected to an upward reaction force during downward movement, and the reaction force moves and separates the support table (206) relative to the base (209) by overcoming the pre-tightening force and the initial reaction force of the elastic element, the sensing assembly generates a feedback signal to control the Z-axis driving mechanism (1) to stop working. 2.The light-cured 3D printing device with pressure prevention device according to claim 1, wherein the sensing assembly comprises a first sensing member (212) arranged on the base (209) and a first detection member (213) arranged on the support table (206), the first sensing member (212) and the first detection member (213) are in a sensible state when the support table (206) is not subjected to an abnormal axial force, when the support table (206) is displaced relative to the base (209) in the direction opposite to the pre-tightening force and reaches a preset threshold value, the relative position or sensing state of the first sensing member (212) and the first detection member (213) changes, thereby generating a first feedback signal. And / or, the sensing assembly includes a second sensing member (214) disposed on the support table (206) or the base (209) for directly or indirectly detecting the contact state between the support table (206) and the base (209), and generating a second feedback signal when the two change from contact to separation; When the printing platform module (3) is subjected to an upward reaction force during downward movement, and the reaction force is transmitted to the support table (206) through the platform connecting module (2), and the resultant force acting on the support table (206) in the opposite direction of the pre-tightening force is greater than the sum of the pre-tightening force of the elastic member (204), the gravity of the support table (206) itself and the reaction force generated by the initial elastic deformation of the elastic element, the support table (206) overcomes the pre-tightening force and the initial pre-tightening force of the elastic element, moves in the opposite direction of the pre-tightening force relative to the base (209) and separates, triggering the sensing assembly to generate a feedback signal to control the Z-axis driving mechanism (1) to stop working. 3.The light-cured 3D printing device with pressure prevention device according to claim 2, wherein The first sensing member (212) and the first detection member (213) are one or a combination of photoelectric sensors, Hall sensors, inductive sensors or capacitive sensors; the second sensing member (214) is a micro switch or a contact sensor or a non-contact proximity switch. 4.The light-cured 3D printing device with pressure prevention device according to claim 1, wherein The platform connecting module (2) further comprises an upper cover plate (201), an upper pressing plate (203), an intermediate block (205) and a lower pressing plate (208), the upper cover plate (201) is directly or indirectly connected with the moving end of the Z-axis driving mechanism (1), the intermediate block (205) is located between the upper cover plate (201) and the base (209); the elastic element comprises an upper elastic sheet (202) and a lower elastic sheet (207), one end of the upper elastic sheet (202) is clamped between the upper cover plate (201) and the upper end of the intermediate block (205), the other end of the upper elastic sheet (202) is clamped between the upper pressing plate (203) and the support table (206), one end of the lower elastic sheet (207) is clamped between the base (209) and the lower end of the intermediate block (205), the other end of the lower elastic sheet (207) is clamped between the lower pressing plate (208) and the support table (206); the elastic member is located between the upper pressing plate (203) and the upper cover plate (201), and applies a downward pre-tightening force to the support table (206) through the upper pressing plate (203). 5.The light-cured 3D printing device with pressure-prevention device according to claim 4, wherein The elastic member (204) is a compression spring. 6.The light-cured 3D printing device with pressure prevention device according to claim 5, wherein An adjusting hole opposite to the elastic member (204) is formed in the upper cover plate (201), and an adjusting member for pressing the elastic member (204) to adjust the pre-tightening force is connected in the adjusting hole. 7.The light-cured 3D printing device with pressure-prevention device according to claim 1, wherein A liquid crystal display screen is arranged on the light-transmitting bearing plate (5) for modulating the exposure image, and the exposure unit (7) is configured to provide only an exposure light source.

8. A pressure-proof method for light-cured 3D printing, applied to a light-cured 3D printing device with a pressure-proof device according to any one of claims 1-7, characterized in that The method comprises the following steps: controlling the Z-axis driving mechanism (1) to drive the platform connecting module (2) and the printing platform module (3) to move downward along the Z-axis; monitoring the state between the support table (206) and the base (209) in the platform connecting module (2) in real time; When the printing platform module (3) encounters an obstacle or an abnormal overpressure during downward movement, generating an upward reaction force, and the reaction force makes the support table (206) receive a resultant force in the opposite direction of the pre-tightening force greater than a preset threshold, the support table (206) moves relative to the base (209) and separates; In response to the separation of the support table (206) and the base (209), the sensing assembly generates a feedback signal; According to the received feedback signal, the Z-axis driving mechanism (1) stops working.

9. The method of claim 8, wherein the method further comprises When the printing platform module (3) encounters an obstacle or an abnormal overpressure during downward movement, generating an upward reaction force, and the reaction force makes the support table (206) receive a resultant force in the opposite direction of the pre-tightening force less than or equal to a preset threshold, the support table (206) is fixed relative to the base (209), and the sensing assembly does not generate a feedback signal.

10. The method of claim 8, wherein the method further comprises The preset threshold is the sum of the pre-tightening force of the elastic member (204), the gravity of the support table (206) itself, and the reaction force generated by the initial elastic deformation of the elastic element.

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