Photocuring 3D printer

Abstract

The invention belongs to the technical field of 3D printing, and discloses a photocuring 3D printer which comprises a machine body. The forming platform is arranged on the machine body; the pressing and holding mechanism is arranged on the machine body, and the pressing and holding mechanism has a pressing and holding state for pressing and holding the forming platform and a releasing state for releasing the forming platform; and the material disc assembly is movably arranged on the machine body, the material disc assembly is connected with the pressing and holding mechanism, and switching of the pressing and holding mechanism between the pressing and holding state and the releasing state is achieved through movement of the material disc assembly. When a user needs to maintain the forming platform, the hold-down assembly can be in a release state, so that the user can conveniently operate the forming platform, when the 3D printer needs to execute a printing task, the hold-down assembly can be in a hold-down state, the stability of the forming platform is guaranteed, and the user can conveniently maintain the forming platform under the condition that the printing quality is not affected. And when a user needs to maintain the forming platform, only the tray assembly needs to be moved, and operation is convenient.

Description

Technical Field

[0001] This invention belongs to the field of 3D printing technology, specifically relating to a photopolymerization 3D printer. Background Technology

[0002] In the photopolymer 3D printing process, the build platform (or platform) serves as the reference plane for model attachment and layer-by-layer growth. However, in 3D printers using this technology, user operation is inconvenient when maintenance (e.g., cleaning) of the build platform is required.

[0003] Therefore, there is an urgent need in this field for a 3D printer to solve the above-mentioned technical problems. Summary of the Invention

[0004] In view of this, the present invention provides a photopolymerization 3D printer to solve the problem of inconvenient maintenance and operation of the molding platform in related technologies.

[0005] This application provides a photopolymerization 3D printer, comprising: a body; a forming platform disposed on the body; a holding mechanism disposed on the body, the holding mechanism having a holding state for holding the forming platform and a releasing state for releasing the forming platform; and a material tray assembly movably disposed on the body, the material tray assembly being connected to the holding mechanism, the movement of the material tray assembly realizing the switching of the holding mechanism between the holding state and the releasing state.

[0006] Optionally, the pressing mechanism includes: a rotary locking assembly rotatably disposed on the machine body, the rotation of the rotary locking assembly realizing the switching of the pressing mechanism between the pressing state and the releasing state; and a driving unit connected between the tray assembly and the rotary locking assembly, the driving unit being configured to drive the rotary locking assembly to rotate when the tray assembly moves.

[0007] Optionally, the driving part includes a wedge block or a protrusion with an inclined surface fixed on the tray assembly; and the pressing mechanism further includes a driven part disposed on the rotary locking assembly, the driven part being in contact with the wedge block or the inclined surface.

[0008] Optionally, the holding mechanism further includes a locking hook disposed on the rotary locking assembly; and when the holding mechanism is in the holding state, the locking hook engages with the molding platform, and when the holding mechanism is in the releasing state, the locking hook separates from the molding platform.

[0009] Optionally, the pressing mechanism includes: at least one pressing plate movably disposed on the machine body, the pressing plate being used to press or release the forming platform from a first direction; and a transmission assembly connected between the material tray assembly and the pressing plate, the transmission assembly being used to convert the movement of the material tray assembly along a second direction into a pressing or releasing action of the pressing plate.

[0010] Optionally, the transmission assembly includes a linkage group, a portion of which is hinged to the tray assembly, and another portion of which is hinged to the pressure plate.

[0011] Optionally, the first direction includes a horizontal direction, and the second direction includes a vertical direction.

[0012] Optionally, when the holding mechanism is in the released state, the tray assembly can rotate relative to the machine body.

[0013] Optionally, the molding platform includes a platform body and a handle fixed to the platform body.

[0014] Optionally, the photopolymer 3D printer further includes a light source module, which is fixed to the tray assembly and located on the side of the tray assembly away from the forming platform.

[0015] Compared with related technologies, the photopolymer 3D printer provided by this invention allows the holding component to be in a released state when the user needs to maintain the molding platform, thus facilitating user operation of the molding platform. When the 3D printer needs to perform a printing task, the holding component can be in a holding state to ensure the stability of the molding platform, making maintenance operations convenient without affecting print quality. Furthermore, by connecting the movement of the material tray assembly with the state switching of the holding mechanism, the platform holding operation and the movement of core functional components are integrated. When the user needs to maintain the molding platform, only the material tray assembly needs to be moved, making operation convenient. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and not all embodiments. For those skilled in the art, other drawings obtained from these drawings without creative effort are all within the scope of protection of this application.

[0017] Figure 1 This is a three-dimensional view of a photopolymerization 3D printer provided in an embodiment of the present invention.

[0018] Figure 2 This is an internal three-dimensional view of a photopolymer 3D printer provided in an embodiment of the present invention.

[0019] Figure 3 This is a perspective view of the molding platform and pressing mechanism provided in the embodiments of the present invention.

[0020] Figure 4 This is a perspective view of the holding mechanism and light source module provided in the embodiment of the present invention.

[0021] Figure 5 This is a perspective view of the rotary locking assembly provided in an embodiment of the present invention.

[0022] Figure 6 This is another perspective view of the rotary locking assembly provided in an embodiment of the present invention.

[0023] Figure 7 This is a perspective view of the molding platform provided in an embodiment of the present invention.

[0024] Explanation of reference numerals in the attached figures: 10 is the machine body, 20 is the forming platform, 21 is the handle, 30 is the pressing mechanism, 31 is the rotary locking assembly, 32 is the drive unit, 321 is the wedge block, 322 is the protrusion, 33 is the driven unit, 34 is the locking hook, 35 is the pressing plate, 36 is the transmission assembly, 361 is the linkage group, 40 is the material tray assembly, and 50 is the light source module. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0026] To make the description of this disclosure more detailed and complete, illustrative descriptions of embodiments and specific examples of the present invention are provided below; however, these are not the only forms of implementing or utilizing the specific embodiments of the present invention. The embodiments cover features of multiple specific embodiments and the methods, steps, and their order for constructing and operating these specific embodiments. However, other specific embodiments may also be used to achieve the same or equivalent functions and step sequences. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0027] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in sequences other than those illustrated or described herein.

[0028] In the description of the embodiments of the present invention, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The word "and / or" in the text is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of this application, "multiple" means two or more. Other quantifiers should be understood similarly. The preferred embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention. Furthermore, the embodiments and features in the embodiments of this application can be combined with each other without conflict.

[0029] Please refer to Figures 1-7 This invention provides a photopolymer 3D printer. The photopolymer 3D printer includes: a body 10, a forming platform 20, a holding mechanism 30, and a material tray assembly 40. The forming platform 20 is disposed on the body 10. The holding mechanism 30 is disposed on the body 10 and has a holding state for holding the forming platform 20 and a releasing state for releasing the forming platform 20. The material tray assembly 40 is movably disposed on the body 10 and is connected to the holding mechanism 30. Movement of the material tray assembly 40 enables the holding mechanism 30 to switch between the holding state and the releasing state.

[0030] When the user needs to maintain or adjust the forming platform 20, the pressing mechanism 30 can be switched to the released state by moving the material tray assembly 40, thus facilitating operation of the forming platform 20. When the 3D printer needs to perform a printing task, the pressing mechanism 30 can be switched to the pressing state by moving the material tray assembly 40, ensuring the stability of the forming platform 20. In this way, without affecting the printing quality, the state switching of the pressing mechanism 30 is achieved through the convenient movement of the material tray assembly 40, making the user's maintenance operations more convenient and efficient.

[0031] In some embodiments, the molding platform 20 has a fixed state that is fixedly connected to the body 10 and a movable state that is movably connected to the body 10. When the molding platform 20 is in the fixed state, the pressing mechanism 30 has a pressing state that presses the molding platform 20 and a releasing state that releases the molding platform 20.

[0032] The printer body 10 constitutes the main support structure of the printer. In the actual structure, the printer body 10 typically includes a frame made of welded or spliced ​​metal profiles and an outer shell covering it, providing a stable mounting base and positioning reference for all internal functional components.

[0033] The forming platform 20 is a metal or composite sheet material with a finely machined and flat surface, on which the printed model will grow layer by layer. It is initially aligned with the preset interface of the machine body 10 through a specific positioning structure (such as positioning pins and guide grooves), and can be finally locked by the holding mechanism 30 described below. It can also be released from the locked state and removed as needed.

[0034] The holding mechanism 30 is disposed on the machine body 10. It is used to hold and fix the forming platform 20. In practical applications, when the forming platform 20 is in a fixed state, the holding mechanism 30 can stably hold it to prevent displacement of the forming platform 20 during printing and ensure printing accuracy; when it is necessary to disassemble or move the forming platform 20, the holding state is released.

[0035] The holding mechanism 30 applies a holding force to the molding platform 20 through its holding component. This holding force can be generated by the weight of the holding component itself, magnetic force, spring force, or driving force provided by an external drive mechanism (such as a motor, cylinder, etc.). In this embodiment, the holding force is preferably provided by an elastic element disposed between the holding component and the machine body 10. When it is necessary to fix the molding platform 20, the holding component is operated to move it to the holding position, and the holding surface is pressed tightly against the surface of the molding platform 20 under the action of the holding force, thereby achieving reliable fixation. When it is necessary to release the fixation, the holding component is operated to move it to the release position, the holding surface separates from the molding platform, and the molding platform can be removed or moved.

[0036] The tray assembly 40 is movably mounted on the machine body 10. The tray assembly 40 is a container unit for holding liquid photosensitive resin, typically including a tray body, a release film, and a pressure frame. Its installation method allows it to move relative to the machine body 10; for example, it can be pushed into a working position horizontally or pulled out for maintenance, or rotated within a certain angle range. There is a physical connection between the tray assembly 40 and the holding mechanism 30, which is a direct mechanical linkage.

[0037] The core of this embodiment lies in the fact that the movement of the tray assembly 40 enables the holding mechanism 30 to switch between the holding state and the releasing state. Specifically, the linkage mechanism is as follows: when the user performs a routine operation on the tray assembly 40 (e.g., pushing the tray assembly 40 into the printing station within the machine body 10), the movement (linear movement or rotation) of the tray assembly 40 directly acts on the holding mechanism 30 through a connected transmission element (such as an inclined plane, cam, connecting rod, or rope). This force drives the moving parts of the holding mechanism 30, forcing it to switch from one state (e.g., the releasing state) to another state (e.g., the holding state). Conversely, when the tray assembly 40 is removed, its reverse movement or, with the assistance of a reset element (such as a spring), drives the holding mechanism 30 back to its original state. Thus, the movement of the tray assembly 40 becomes a direct trigger for controlling the locking and unlocking of the molding platform 20.

[0038] In the above technical solution, on the one hand, the detachable design of the molding platform 20 and the dual-state function of the holding mechanism 30 provide a basis for quick replacement; on the other hand, by creatively mechanically coupling the movement of the tray assembly 40 with the state switching of the holding mechanism 30, deep integration of functional operation is achieved. Users do not need to find and operate a separate platform locking button, knob, or wrench; they only need to perform the necessary and natural operation of pushing the tray in or pulling it out to automatically and synchronously lock or unlock the molding platform 20. This design seamlessly integrates two originally separate user operation steps into a single, continuous action, greatly simplifying the operation process, reducing cognitive and operational burdens, and significantly improving the ease of use and overall efficiency of the equipment while ensuring locking reliability.

[0039] As a further improvement to the present invention, please refer to Figures 3-5 Please refer to the figure. The holding mechanism 30 includes: a rotary locking assembly 31 and a driving part 32.

[0040] The rotary locking assembly 31 is rotatably mounted on the machine body 10. Specifically, the rotary locking assembly 31 typically includes a rotary locking body and a rotating shaft. The rotary locking body can be a plate or arm-shaped piece with a specific profile, which is mounted on a fixed support or bearing seat of the machine body 10 via the rotating shaft. The rotating shaft and the support are engaged by a bearing or bushing, allowing the rotary locking body to rotate smoothly and precisely around the axis of the rotating shaft. The rotation of the rotary locking assembly 31 changes the spatial position of a working part (e.g., a hook or pressure block) that interacts with the forming platform 20, thereby enabling the holding mechanism 30 to switch between the holding state and the releasing state.

[0041] The drive unit 32 is connected between the tray assembly 40 and the rotary locking assembly 31. The drive unit 32 is a transmission member connecting the movable tray assembly 40 and the rotatable rotary locking assembly 31. It is configured to drive the rotary locking assembly 31 to rotate when the tray assembly 40 moves. In one specific embodiment, the drive unit 32 can be a rigid connecting rod, one end of which is connected to a fixed point on the tray assembly 40 via a first hinge, and the other end of which is connected to a point off-center on the rotary locking body via a second hinge. When the tray assembly 40 moves along its guide path (e.g., horizontally), it pulls or pushes the hinge point on the rotary locking body through the connecting rod, thereby generating a torque that causes the rotary locking body to rotate about its axis. In another embodiment, the drive unit 32 can also be a wedge-shaped slider or cam surface fixed to the tray assembly 40, while the rotary locking assembly 31 has a cooperating roller or inclined follower. The movement of the tray assembly 40 causes relative motion between the wedge block 321 or the cam surface and the follower, thereby converting the linear motion into the rotation of the rotary latch through the inclined plane.

[0042] In the above technical solution, a highly efficient and reliable state-switching execution unit is formed by using a rotary locking assembly 31 in conjunction with a dedicated drive unit 32. Its advantages are as follows: the drive unit 32 (such as a connecting rod or inclined plane) directly and efficiently converts the linear movement of the tray assembly 40 into the rotational motion of the rotary locking assembly. The force transmission path is clear, energy loss is small, and the action response is rapid and definite. The rotation of the rotary locking assembly can produce a clear locking and unlocking action, and its final position (pressing position or releasing position) usually has a mechanical limit, with a clear state and good self-holding ability, ensuring the reliability of pressing and the thoroughness of releasing. The space required for rotational motion is usually smaller than that for long-stroke linear motion. The rotary locking assembly 31 can be designed to be relatively compact, facilitating its arrangement within the limited space inside the machine body 10. The connection method of the drive unit 32 (such as hinge) also allows the tray assembly 40 and the holding mechanism 30 to have a certain degree of spatial freedom in their arrangement. By designing the hinge point position or the angle of the inclined plane between the drive unit 32 and the rotary latch, the movement of the tray assembly 40 at which the latch is triggered to rotate, as well as the angle of the latch rotation, can be precisely controlled, thereby realizing the precise positioning linkage between the holding / releasing action and the tray position.

[0043] As a further improvement to the present invention, please refer to Figure 6 The specific structure of the driving part 32 is: a wedge block 321 or a protrusion 322 with an inclined surface fixed on the tray assembly 40.

[0044] In the scheme employing wedge block 321, the wedge block 321 is a separate part having at least one inclined plane, which is securely installed at a specific location on the outer wall, bottom, or frame of the tray assembly 40 by means of screws, snaps, or welding. The inclined surface of the wedge block 321 constitutes the drive working surface.

[0045] In the scheme of using a protrusion 322 with an inclined surface, the protrusion 322 can be integrally formed with the body (such as the side plate) of the tray assembly 40, or an inclined drive surface can be directly formed on its surface by processing.

[0046] The holding mechanism 30 also includes a driven part 33. The driven part 33 is disposed on the rotary locking assembly 31. Specifically, the driven part 33 is typically a rotatable roller mounted on the rotary locking body via a small shaft; alternatively, it can be a pin, boss, or directly machined protrusion 322 edge fixed to the rotary locking body. The position of the driven part 33 is calculated so that when the rotary locking assembly 31 is at a certain angle, it spatially corresponds to the driving part 32 (wedge block 321 or protrusion 322) on the tray assembly 40.

[0047] The driven part 33 is in contact with the wedge block 321 or the inclined surface. This is a separable force transmission relationship based on contour contact.

[0048] When the tray assembly 40 is moved (e.g., pushed into the machine body 10) to a certain position, the inclined surface of the drive part 32 (wedge block 321 or protrusion 322) fixed on it will gradually approach and eventually make physical contact with the driven part 33 (such as a roller) on the rotary locking assembly 31.

[0049] As the tray assembly 40 continues to move, the inclined surface of the drive unit 32 slides relative to the driven unit 33. Due to the geometry of the inclined surface, this relative sliding generates a normal force perpendicular to the inclined surface. After decomposition, one component of this normal force acts on the driven unit 33, generating a torque that causes the rotary locking assembly 31 to rotate about its axis. Thus, the linear movement of the tray assembly 40 is converted into the rotation of the rotary locking assembly 31, achieving a state switch.

[0050] When the tray assembly 40 moves in the reverse direction, the inclined surface of the drive part 32 disengages from the driven part 33, and the rotary locking assembly 31 may rotate under the action of the return spring or be driven by a similar mechanism on the other side to switch back to the initial state.

[0051] In the above technical solution, by adopting a wedge block 321 / sloping protrusion 322 driving part 32 and driven part 33 in a sloped contact transmission scheme, the following technical effects are provided: the driving part 32 (sloping surface) and the driven part 33 (roller / protrusion) are both very simple mechanical components, without complex linkages or gear systems, resulting in fewer parts, lower failure rate, and lower manufacturing cost; the sloped transmission smoothly converts linear motion into rotary motion, with continuous action. The angle of the slope determines the transmission ratio and the required operating force, making the design controllable. The contact point is usually on a line or at a single point, resulting in low friction and smooth movement; in some designs, this contact transmission allows for a certain degree of elasticity or slippage, which can prevent hard damage when the mechanism jams; the position or angle of the wedge block 321 can sometimes be adjusted, facilitating the calibration of the linkage timing. Wear parts (such as rollers) are also easy to replace.

[0052] As a further improvement of the present invention, the holding mechanism 30 also includes a locking hook 34.

[0053] The locking hook 34 is disposed on the rotary locking assembly 31. Specifically, the locking hook 34 is typically a rigid component with a specific profile, such as an L-shaped or J-shaped metal hook. It is fixedly disposed at the end or outer side of the rotary locking assembly 31 by welding, bolting, or integral molding with the main body of the rotary locking assembly 31. The installation position and orientation of the locking hook 34 are precisely designed so that it can move synchronously with the overall rotation of the rotary locking assembly 31.

[0054] The core function of this embodiment is defined by the relationship between the locking hook 34 and the forming platform 20 in two states: When the holding mechanism 30 is in the holding state, the locking hook 34 engages with the forming platform 20. When the driving part 32 (such as the wedge block 321) drives the rotary locking assembly 31 to rotate to the holding position, the locking hook 34 disposed thereon also rotates to a specific angle. At this angle, the hook-shaped end or engaging part of the locking hook 34 will embed, engage, or hook into a specially provided slot, flange, or locking hole on the forming platform 20.

[0055] This locking mechanism is a rigid mechanical interlock. The outline of the locking hook 34 engages with the locking structure on the forming platform 20, thereby creating a constraint in the direction perpendicular to the platform plane (usually the vertical direction) and / or the horizontal direction, physically preventing the forming platform 20 from disengaging from or moving from the machine body 10, thus achieving reliable locking.

[0056] When the holding mechanism 30 is in the released state, the locking hook 34 separates from the forming platform 20. When the drive unit 32 reverses or resets, driving the rotary locking assembly 31 to rotate to the released position, the locking hook 34 rotates synchronously away from its holding position. At this new angle, the hook-shaped end or engaging part of the locking hook 34 completely retracts from the slot, flange, or locking hole of the forming platform 20, and the two no longer have any engagement or contact in space, i.e., they are in a separated state.

[0057] This separation creates an unobstructed space for the molding platform 20 to be removed and placed, allowing the user to freely remove the molding platform 20 from the body 10 or place a new platform in place without any interference from the locking hook 34.

[0058] In the above technical solution, by adding a dedicated locking hook 34 to the rotary locking assembly 31 and clearly defining its mechanical relationship with the forming platform 20 in the holding and releasing states, the following beneficial effects are achieved: Locking is a classic rigid mechanical interlocking method. Compared with simple friction clamping, it has stronger impact and vibration resistance, providing an extremely reliable locking effect and ensuring the absolute stability of the forming platform 20 during printing. Locking is usually accompanied by a clear click or tactile feedback, and separation provides clear visual and tactile feedback, allowing users to intuitively and definitively perceive whether the platform has been securely locked or fully released, enhancing operational confidence and safety. The contact between the locking hook 34 and the engaging part of the forming platform 20 is usually surface contact or line contact, with a relatively reasonable stress distribution. Made of metal, it has good wear resistance and can withstand long-term repeated locking and separating operations. The arc motion trajectory of the locking hook 34 naturally matches the rotation of the rotary lock, enabling it to achieve locking and unlocking actions in a simple and efficient manner, making it an ideal execution end of the rotary locking mechanism.

[0059] As a further improvement of the present invention, the pressing mechanism 30 includes at least one pressing plate 35 and a transmission assembly 36.

[0060] At least one pressure plate 35 is movably disposed on the machine body 10. The pressure plate 35 is typically a pair of symmetrically arranged pressure arms or clamps, but can also be a single eccentric clamp. Its movability means that the pressure plate 35 is not fixed but can move relative to the machine body 10. In one embodiment, each pressure plate 35 can rotate about a pivot fixed to the machine body 10; in another embodiment, the pressure plate 35 can slide along a linear guide rail disposed on the machine body 10. The end of the pressure plate 35 has a pressure surface for contacting a corresponding side or edge of the forming platform 20. Its core function is to press or release the forming platform 20 from a first direction. Here, the first direction refers to the direction in which the pressure plate 35 applies pressure force; for example, when a pair of pressure plates 35 clamp from the left and right sides, the first direction is horizontal; when the pressure plates 35 press from above or below, the first direction is vertical.

[0061] The transmission assembly 36 is connected between the tray assembly 40 and the pressure plate 35. The transmission assembly 36 is a mechanical connection and motion conversion mechanism connecting the movable tray assembly 40 and the movable pressure plate 35. Its core function is to convert the movement of the tray assembly 40 along a second direction into a pressing or releasing action of the pressure plate 35. Here, the second direction refers to the direction in which the tray assembly 40 moves relative to the machine body 10, which is usually different from the first direction; for example, the second direction is vertical, while the first direction is horizontal.

[0062] In one specific embodiment, the transmission assembly 36 may include a push rod or slider fixedly connected to the tray assembly 40, and a ramp-roller mechanism or linkage mechanism connected between the push rod / slider and the pressure plate 35. When the tray assembly 40 moves in a second direction (e.g., downward), it drives the push rod / slider to move synchronously. The ramp on the push rod / slider contacts the roller on the pressure plate 35, or transmits the motion to the pressure plate 35 through the linkage, thereby converting the linear motion in the second direction into a pressing action that drives the pressure plate 35 in a first direction (e.g., moving horizontally inward). Conversely, when the tray assembly 40 moves in the opposite direction (e.g., upward), it drives the pressure plate 35 to move in the opposite direction, achieving release.

[0063] In the above technical solution, by adopting a combination of a movable pressure plate 35 and a transmission assembly 36, another efficient, reliable, and adaptable state-switching execution unit is formed. Its beneficial effect is that the core function of the transmission assembly 36 is to convert the moving direction (second direction) of the tray assembly 40 into the action direction (first direction) required for the pressure plate 35 to press. This allows the installation and movement direction of the drive source (material tray assembly 40) to be completely decoupled from the working direction required by the pressing actuator (pressing plate 35), greatly improving the flexibility and freedom of the overall mechanical layout. The pressing plate 35 typically presses directly against the side of the forming platform 20 in a linear motion, providing concentrated and strong pressing force to effectively resist the lateral force or overturning moment experienced by the platform during printing. The pressing effect is intuitive and reliable. This solution can flexibly design the number (one or more), pressing direction (side, top, or bottom), and shape of the pressing surface of the pressing plates 35 according to the structural characteristics of the forming platform 20, to adapt to the design of different platforms, making it highly versatile. By driving multiple pressing plates 35 simultaneously through a transmission assembly 36, it can be ensured that they move synchronously, achieving balanced pressing of the forming platform 20 and avoiding platform tilting caused by unilateral pressing.

[0064] As a further improvement of the present invention, the transmission assembly 36 includes a linkage group 361.

[0065] The linkage assembly 361 is a planar or spatial mechanism consisting of multiple rigid links connected by revolute joints (i.e., hinges). In this embodiment, a portion of the linkage assembly 361 is hinged to the tray assembly 40. Specifically, one end of the linkage assembly 361, referred to as the first portion or input link, is rotatably connected to a fixed connecting seat on the tray assembly 40 via a first hinge axis. This hinge point is located on the tray assembly 40 such that when the tray assembly 40 moves along its second direction (e.g., the vertical direction), the input link can be moved accordingly via the hinge.

[0066] Meanwhile, another portion of the linkage 361 is hinged to the pressure plate 35. Specifically, one end of the linkage 361, referred to as the final portion or output link, is rotatably connected to a connection point on the pressure plate 35 (or its drive arm) via a second hinge axis. The pressure plate 35 is typically rotatably mounted to the body 10, and the hinge point is located on the pressure plate 35 at a position offset from its own center of rotation.

[0067] The above-described hinge relationship constitutes a complete kinematic chain. Its working principle is as follows: When the tray assembly 40 moves in the second direction (e.g., downward) under the action of external force or its own weight, the input link that is hinged to it is pulled or pushed through the first hinge axis.

[0068] The motion of the input link is transmitted through the intermediate links within the link assembly 361 and the geometric constraints, thus altering the configuration of the entire link assembly 361. The design of the link assembly 361 (the length of each link and the position of the hinge point) converts the linear displacement of the input point (first hinge axis) into a specific trajectory motion of the output point (second hinge axis). This output trajectory is designed to drive the pressure plate 35 to rotate about its own axis.

[0069] The output linkage transmits its motion to the pressure plate 35 via the second hinge axis. When the tray assembly 40 moves downward, the configuration change of the linkage group 361 drives the pressure plate 35 to rotate inward (towards the forming platform 20) about its pivot axis, thereby performing a pressing action; when the tray assembly 40 moves upward, the linkage group 361 moves in the opposite direction, driving the pressure plate 35 to rotate outward, thereby performing a release action. This process accurately and reliably converts the vertical movement of the tray assembly 40 into the pressing or releasing action of the pressure plate 35.

[0070] In the above technical solution, the adoption of the linkage group 361 as a specific transmission scheme brings the following technical effects: the kinematic characteristics of the linkage mechanism are precise and calculable. By changing the length of each link and the position of the hinge point, the required motion conversion relationship (such as displacement amplification ratio and motion trajectory) can be designed very precisely to achieve an ideal match between the travel of the material tray and the opening and closing degree of the pressure plate 35; the linkage group 361 is a fully rigid connection without flexible elements (such as belts or ropes), so the force transmission is direct, without delay, and without elastic deformation, providing a stable and reliable driving force to ensure that the pressing action is powerful and in place; a well-designed linkage group 361 can be integrated in a limited space to achieve complex motion conversion, making it very suitable for arrangement in the compact space inside the printer to transmit the movement of the material tray to the pressure plate 35, which may be located on the side or below; the hinge is a simple revolute joint, and as long as lubrication is ensured, its wear is small and its lifespan is long. The structure is robust and not easily damaged.

[0071] As a further improvement of the present invention The first direction of movement of the pressing plate 35 in the pressing mechanism 30 includes the horizontal direction, while the second direction of movement of the driving source (material tray assembly 40) includes the vertical direction.

[0072] Specifically, the first direction includes a horizontal direction, meaning that the at least one clamping plate 35 is configured to move in a generally horizontal plane to perform clamping or releasing of the forming platform 20. For example, when a pair of clamping plates 35 are provided, they can move toward each other in a left-right direction (i.e., the X-axis direction) to clamp the sides of the forming platform 20, or move in opposite directions to release. The clamping surfaces of the clamping plates 35 are typically perpendicular to this horizontal direction to ensure effective contact and clamping with the sides of the forming platform 20. This horizontal clamping effectively restrains the movement of the forming platform 20 in the horizontal plane, resisting horizontal shearing forces or vibrations that may occur during the printing process.

[0073] The second direction includes the vertical direction, which refers to the direction in which the main movement of the tray assembly 40 relative to the body 10 is approximately vertical (i.e., the Z-axis direction). This is a common and necessary movement mode for the tray assembly 40 in a photopolymer 3D printer, such as raising the tray to contact the forming platform 20 before printing, or lowering it after printing for easy loading and unloading. This vertical movement is part of the normal operation of the printer.

[0074] Once these two directions are defined, the vertical movement (second direction) of the tray assembly 40 is converted, via the transmission assembly 36 (such as the linkage 361), into the action of driving the pressure plate 35 to open and close in the horizontal direction (first direction). For example, when the tray assembly 40 descends, the left and right pressure plates 35 are driven to move horizontally inward through the transmission of the linkage 361, clamping the forming platform 20; when the tray assembly 40 rises, the pressure plates 35 are driven to move horizontally outward, releasing the forming platform 20.

[0075] In the above technical solution, the first direction is explicitly defined as horizontal and the second direction as vertical, which has the following important technical effects and significance: the horizontal pressing and the vertical driving are orthogonal in space. This orthogonal relationship allows the design of the transmission component 36 (such as the linkage 361) to make full use of the lever principle or a specific motion trajectory to achieve effective force amplification or motion stroke matching, making the operation more effortless or the action more precise.

[0076] As a further improvement of the present invention When the holding mechanism 30 is in the released state, the tray assembly 40 can rotate relative to the machine body 10.

[0077] Specifically, the connection between the tray assembly 40 and the machine body 10 is designed to allow relative rotation between them. In one embodiment, this is achieved by hinged one side or end of the tray assembly 40 to the machine body 10 via a horizontally positioned rotating shaft (or tray pivot). This rotating shaft is mounted on a fixed support of the machine body 10, and a corresponding part of the tray assembly 40 is provided with a bushing or bearing to engage with it, allowing the tray assembly 40 to pitch and rotate within an angular range (e.g., 0 to 30 degrees) about this horizontal axis. In another embodiment, a ball joint or a rotatable mounting platform with a rotating seat can also be used to achieve more flexible multi-directional rotation.

[0078] The key technical logic lies in the fact that the rotatable characteristic of the tray assembly 40 is conditionally related to the state of the pressing mechanism 30: When the holding mechanism 30 is in the released state, it means that the forming platform 20 is not locked and can be picked up and put down. At the same time, the auxiliary locking mechanism (which may be a simple pin, latch, or electromagnetic lock) that provides rotational constraint for the tray assembly 40 is also released in conjunction. At this time, in addition to being able to move along its main direction of movement (such as horizontal push and pull), the tray assembly 40 also gains the freedom of rotation about its hinge axis. The user can change its tilt angle by holding the edge of the tray and pulling the tray assembly 40 up or down to make it rotate about the hinge axis.

[0079] When the holding mechanism 30 is in the holding state, that is, when the forming platform 20 is locked, the auxiliary locking mechanism used to limit the rotation of the tray assembly 40 is usually also locked in conjunction (or self-locked through structural interference). At this time, the rotational freedom of the tray assembly 40 relative to the machine body 10 is prohibited or greatly restricted, and it is stably maintained in a preset working posture (usually horizontal) to ensure the levelness and stability of the resin liquid surface during the printing process.

[0080] In the above technical solution, the rotatable characteristic of the tray assembly 40 under specific conditions brings the following beneficial effects: When it is necessary to add resin to the tray, stir the resin, clean the tray, or replace the release film, the user can put the holding mechanism 30 in the released state and then rotate the tray assembly 40 upward to lift it by an angle. This allows the opening of the tray to face the operator at a better angle, facilitating operations such as pouring, observation, scraping, or cleaning, avoiding the inconvenience and risk of liquid splashing caused by operating in a horizontal state; After printing, lifting the tray assembly 40 by a certain angle helps the residual resin in the cavity to flow back to the lower position more completely, reducing waste and making it easier to observe the remaining resin. At the same time, it also helps air bubbles move to a higher position and burst, optimizing the liquid level state for the next print; Linking this rotatable function with the state of the holding mechanism 30 ensures that the rotation function is only activated when it is safe and necessary (when the platform is not printing and can be maintained), and is reliably locked during printing without affecting the core function; The operation of lifting the tray is more in line with the natural posture of the human body, reducing the degree of bending over or straining to observe, and improving the comfort of long-term use.

[0081] As a further improvement to the present invention, please refer to Figure 7 The molding platform 20 includes a platform body and a handle 21 fixed to the platform body.

[0082] The platform body is the core functional component of the molding platform 20, and is typically a plate-shaped component made of aluminum alloy, stainless steel, or a metal plate with a special surface treatment. It has a precision-machined and leveled printing surface on which the printing model will be attached and grown. The platform body is also provided with positioning holes, guide grooves, or engaging structures for positioning with the machine body 10, or for engaging with the holding mechanism 30 (such as locking hook 34, holding plate 35).

[0083] The handle 21 is fixed to the platform body. Specifically, the handle 21 is a separate component that is easy for the hand to grip, usually made of plastic, rubber-coated metal, or engineering plastic, and its shape is ergonomically designed, such as a horizontal or vertical rod-shaped, ring-shaped, or raised with anti-slip texture 322. The handle 21 can be fixed by: passing through the back of the platform body with bolts or screws and locking it to the mounting base of the handle 21; or by welding the metal handle 21 directly to the edge or back of the platform body; or by using strong adhesive. The fixing points are usually located on the side, corner, or back of the platform body in non-working areas to ensure that the handle 21 is firm and reliable and does not affect the printing function of the platform body or its cooperation with other mechanisms.

[0084] In the aforementioned further improved technical solution, the addition of a fixed handle 21 to the molding platform 20 brings the following significant benefits: It provides users with a clear and dedicated gripping area. When installing or removing the molding platform 20, users can easily and securely grip the handle 21 for pushing, pulling, and lifting operations, avoiding the slippage, effort, or contact with the printing surface (potentially leaving uncured resin) that may occur when directly gripping the platform edge, making operation safer and more comfortable. The dedicated handle 21 reduces direct contact between the user's hands and the platform body, especially the printing surface, reducing the risk of affecting model adhesion due to hand sweat or oil contamination of the printing surface, and also preventing scratches or deformation of the platform body due to improper gripping. The rationally designed position and shape of the handle 21 allow users to operate with a more natural and effortless posture and direction of force, reducing labor intensity, which is especially important for large and heavy molding platforms 20. Adding a fixed handle 21 is an extremely simple structural modification that increases manufacturing costs almost nothing, yet significantly improves user experience and the product's ergonomics, making it a design optimization with a very high return on investment.

[0085] As a further improvement of the present invention, a light source module 50 is also included.

[0086] The light source module 50 is fixed to the tray assembly 40. Specifically, the light source module 50 is the core optical unit that generates curing light (usually ultraviolet light of a specific wavelength), and it generally includes an LED light source array, a light homogenizing device, an imaging panel (such as an LCD screen or a DMD chip), and necessary heat dissipation structures and support frames. The light source module 50 is rigidly and immovably fixed to the structure of the tray assembly 40 by means of bolts, clips, or special mounting brackets, and the two form an integrated motion unit.

[0087] The key layout limitation of this embodiment is that the light source module 50 is located on the side of the tray assembly 40 away from the molding platform 20. This clarifies the spatial stacking order of the three components: starting from the side closest to the molding platform 20, the order is molding platform 20, tray assembly 40, and light source module 50 located on the other side of tray assembly 40.

[0088] During printing: The lower surface of the molding platform 20 is immersed in the resin liquid surface of the tray assembly 40's receiving cavity, while the light source module 50 is fixed directly below the tray assembly 40 (i.e., on the side away from the molding platform 20). Light is emitted upward from the light source module 50, passing through the light-transmitting window at the bottom of the tray assembly 40 (usually composed of a release film and a transparent base plate) and the liquid resin thereon, ultimately illuminating the lower surface of the molding platform 20 or the cured model layer for curing.

[0089] In the linked working state: Since the light source module 50 and the material tray assembly 40 are fixedly connected as one unit, when the material tray assembly 40 moves (such as lifting, pushing or pulling) to achieve linkage with the holding mechanism 30, the light source module 50 moves synchronously. The relative positional relationship between its light-emitting surface and the bottom of the material tray, and finally with the forming platform 20, remains unchanged or changes according to the design rules during the movement.

[0090] In the above technical solution, by directly fixing the light source module 50 to the tray assembly 40 and defining its spatial orientation, a deeper functional integration and system optimization are achieved, resulting in the following important benefits: The light source module 50, the tray assembly 40, and the linked pressing mechanism 30 drive unit 32 are integrated into a rigid moving whole. When this whole moves to drive the pressing mechanism 30 to switch states, the light source, tray, and drive action maintain absolute synchronization, eliminating timing errors or positional deviations that may be caused by independent movement; the light source module 50 is fixed to the bottom of the tray assembly 40, ensuring a constant distance and angle relationship between the light-emitting surface and the light-transmitting window of the tray. This is crucial for ensuring exposure uniformity and imaging accuracy, providing a stable optical foundation for high-quality printing results; changing the traditional independent fixed installation method of the light source module 50 to integration with the movable tray assembly 40 eliminates the need for a separate complex leveling or motion mechanism for the light source. The overall structure is more compact and simple, reducing the number of parts and potential failure points. All functions related to the movement of the tray assembly 40, including driving platform pressing, changing the tray position, and moving the light source, are unified on the movement of the same physical carrier. This makes the control logic and mechanical logic of the whole machine highly unified, with stronger system integration, and easier to understand and maintain.

[0091] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0092] The above embodiments merely illustrate preferred implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A photopolymer 3D printer, characterized in that, include: body; A forming platform, wherein the forming platform is disposed on the machine body; A holding mechanism is disposed on the machine body, and the holding mechanism has a holding state of holding the molding platform and a releasing state of releasing the molding platform; as well as A material tray assembly is movably disposed on the machine body. The material tray assembly is connected to the pressing mechanism. The movement of the material tray assembly enables the pressing mechanism to switch between the pressing state and the releasing state.

2. The photopolymer 3D printer as described in claim 1, characterized in that, The pressing mechanism includes: A rotary locking assembly, rotatably mounted on the machine body, wherein rotation of the rotary locking assembly switches the holding mechanism between a holding state and a releasing state; and A drive unit is connected between the tray assembly and the rotary locking assembly, and the drive unit is configured to drive the rotary locking assembly to rotate when the tray assembly moves.

3. The photopolymer 3D printer as described in claim 2, characterized in that, The drive unit includes a wedge-shaped block or a protrusion with an inclined surface fixed to the tray assembly; and The pressing mechanism further includes a driven part, which is disposed on the rotary locking assembly and contacts the wedge block or the inclined surface.

4. The photopolymerization 3D printer as described in claim 2, characterized in that, The holding mechanism further includes a locking hook, which is disposed on the rotary locking assembly; and When the holding mechanism is in the holding state, the locking hook engages with the molding platform; when the holding mechanism is in the releasing state, the locking hook disengages from the molding platform.

5. The photopolymer 3D printer as described in claim 1, characterized in that, The pressing mechanism includes: At least one pressure plate, movably disposed on the machine body, the pressure plate being used to press or release the forming platform from a first direction; and A transmission assembly is connected between the tray assembly and the pressure plate, and the transmission assembly is used to convert the movement of the tray assembly along the second direction into the pressing or releasing action of the pressure plate.

6. The photopolymerization 3D printer as described in claim 5, characterized in that, The transmission assembly includes a linkage group, a portion of which is hinged to the tray assembly, and another portion of which is hinged to the pressure plate.

7. The photopolymer 3D printer as described in claim 5, characterized in that, The first direction includes the horizontal direction, and the second direction includes the vertical direction.

8. The photopolymer 3D printer as described in claim 1, characterized in that, When the holding mechanism is in the released state, the tray assembly can rotate relative to the machine body.

9. The photopolymer 3D printer as described in claim 1, characterized in that, The molding platform includes a platform body and a handle fixed to the platform body.

10. The photopolymer 3D printer as described in claim 1, characterized in that, Also includes: A light source module is fixed to the material tray assembly, and the light source module is located on the side of the material tray assembly away from the forming platform.

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