FDM bottom plate mounting structure of 3D printing device

Abstract

The invention discloses an FDM bottom plate mounting structure of a 3D printing device, and belongs to the technical field of 3D printing equipment. The FDM bottom plate mounting structure of the 3D printing device comprises a machine box, a base plate and a circular FDM bottom plate, the base plate and the FDM bottom plate are both located in the machine box, the base plate is provided with a target area used for containing the FDM bottom plate, the FDM bottom plate mounting structure of the 3D printing device further comprises a limiting mechanism, and the limiting mechanism comprises a plurality of supporting plates, a plurality of connecting rods and a traction piece; the multiple supporting plates are arranged around the center of the target area, all the supporting plates are rotationally connected to the base plate, the upper surfaces of the multiple supporting plates are located on the same horizontal plane, and all the supporting plates rotate at the same time. According to the FDM bottom plate mounting structure of the 3D printing device, the problem that an existing mode of adjusting the levelness of the FDM bottom plate through pre-tightening force of bolts causes deformation and inclination of the FDM bottom plate is solved, and the printing quality of 3D products is further guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing equipment, and in particular to an FDM base plate mounting structure of a 3D printing device. Background Art

[0002] 3D printing is a type of rapid prototyping technology, also known as additive manufacturing. It is a technology that uses digital model files as the basis and uses adhesive materials such as powdered metal or plastic to construct objects by printing layer by layer.

[0003] Most of the existing devices facilitate the installation and disassembly of the FDM base plate by tightening and loosening the screws. However, after the screws are locked on the FDM base plate, the entire FDM base plate will tilt due to the different tightening forces of the screws, which will cause the 3D printed model to be skewed, which is inconvenient for personnel to control. For example, an FDM base plate installation structure of a 3D printing device with publication number CN217944341U, when in use, first when installing the FDM base plate, it is only necessary to fit the connecting ports at the four bottom corners of the FDM base plate with the top of the shock-absorbing sleeve in turn, and then extend the top of the screw into the inner side of the bottom connecting port of the FDM base plate and tighten it. When the FDM base plate is damaged and needs to be replaced, it is only necessary to loosen the four screws to quickly remove the FDM base plate, which is convenient for maintenance and replacement of the FDM base plate. However, since the method of fastening the bottom connection port of the FDM base plate with bolts easily causes the FDM base plate to deform, the horizontality of the FDM base plate is reduced, and the printed 3D product is further tilted, which easily causes quality problems of the printed 3D product. Summary of the invention

[0004] The purpose of the present invention is to overcome the problems in the prior art and to provide an FDM base plate mounting structure for a 3D printing device, which avoids the existing method of adjusting the horizontality of the FDM base plate by the pre-tightening force of the bolts, causing the FDM base plate to deform and tilt, thereby further ensuring the printing quality of the 3D product.

[0005] The present invention provides an FDM base plate installation structure of a 3D printing device, comprising a chassis, a base plate and a circular FDM base plate, wherein the base plate and the FDM base plate are both located in the chassis, and the base plate has a target area for placing the FDM base plate, and the FDM base plate installation structure of the 3D printing device also includes a limiting mechanism, wherein the limiting mechanism includes: a plurality of support plates, a plurality of connecting rods and a traction member; the plurality of support plates are arranged around the center of the target area, and each support plate is rotatably connected to the base plate, and the upper surfaces of the plurality of support plates are all located in the same horizontal plane, and after the plurality of support plates rotate simultaneously, the ends of the plurality of support plates are all close to or away from the center of the target area, so as to simultaneously support or release the FDM base plate, and each support plate has a connection point on the surface on both sides of its rotation center; the number of the plurality of connecting rods is the same as the number of the plurality of support plates, and the two ends of each connecting rod are respectively rotatably connected to the connection points on two adjacent support plates, so as to drive the plurality of support plates to rotate simultaneously; the traction member includes a fixed end and a movable end, wherein the fixed end is connected to the base plate, and the movable end is rotatably connected to the middle part of any one of the connecting rods, so that after the movable end is actuated, the plurality of support plates are driven to rotate in the same direction.

[0006] Preferably, the support plate includes: a strip plate and a connecting plate; the middle part of the strip plate is rotatably arranged on the base plate, one of the corners of the strip plate is provided with an arc surface, and the end of the strip plate away from the arc surface has a connection point; the connecting plate is fixedly connected to the middle part of the strip plate on one side close to the arc center angle of the arc surface, and the connecting plate has a connection point.

[0007] Preferably, the number of the support plates is 4; the multiple connecting rods include two first connecting rods and two second connecting rods, and the two connection points on each of the support plates are respectively connected to the end of a first connecting rod and the end of a second connecting rod, so that the two first connecting rods and the two second connecting rods form a rectangle, and the movable end of the traction member is rotatably connected to the middle part of the first connecting rod or the middle part of the second connecting rod.

[0008] Preferably, a circular hole is provided on the target area of ​​the substrate, and a plurality of vertical guide blocks are fixedly provided on the surface of the substrate around the contour edge of the circular hole, and the sides of the plurality of vertical guide blocks are slidably connected to the circumferential surface of the FDM base plate; the FDM base plate mounting structure of the 3D printing device also includes a lifting mechanism, the lifting mechanism is located below the substrate, and the lifting end of the lifting mechanism is connected to the substrate, and a tray for receiving the FDM base plate is provided below the substrate.

[0009] Preferably, the lifting mechanism includes: a double-headed screw, two nut sliders and two rotating rods, the threads at both ends of the double-headed screw have opposite rotation directions and are rotatably arranged on the outer bottom of the chassis, and the bottom wall of the chassis is provided with sliding holes located on the same straight line, and the length direction of the sliding holes is parallel to the double-headed screw; two nut sliders are respectively threadedly connected to the two ends of the double-headed screw; two rotating rods correspond to one nut slider respectively, the nut slider is rotatably connected to one end of the rotating rod, and the other end of the rotating rod passes through the sliding hole on the corresponding side and is rotatably connected to the lower surface of the substrate.

[0010] Preferably, two horizontal rods are fixedly provided on the lower surface of the base plate, and the horizontal rods are parallel and symmetrically arranged on both sides of the circular hole, and the middle part of each horizontal rod is rotatably connected to the end of the rotating rod on the corresponding side; the opposite side edges of the base plate are provided with guide grooves, and the guide grooves are slidably connected to the vertical guide rails arranged on the inner side of the chassis.

[0011] Preferably, the side of the chassis has a door, and the inner bottom surface of the chassis is provided with a delivery mechanism for sending the tray toward the door, and the delivery mechanism includes: two horizontal slide rails, an upper rack, a gear, a horizontal push rod and a lower rack; the two horizontal slide rails are arranged parallel to each other on the inner bottom surface of the chassis, and a horizontal slider slidably arranged on each horizontal slide rail is fixedly connected to the tray; the upper rack is fixedly connected to the bottom surface of the tray, and the length direction of the upper rack is parallel to the horizontal slide rail; the gear meshes with the upper rack; one end of the horizontal push rod is fixedly connected to the chassis, and the other end is rotatably connected to the gear, and the extension direction of the horizontal push rod is parallel to the horizontal slide rail; the lower rack meshes with the gear and is parallel to the horizontal slide rail.

[0012] Preferably, a first pulley is fixedly provided at the middle of the double-headed screw, the first pulley is connected to a second pulley via a belt, the second pulley is fixedly arranged on the output shaft of the motor, and the motor is fixed on the chassis.

[0013] Preferably, a limiting ring is fixedly provided on the upper surface of the tray, the limiting ring is coaxial with the FDM bottom plate, and the inner diameter of the limiting ring is larger than the diameter of the FDM bottom plate.

[0014] Preferably, a transition arc is provided on the side surface of the upper end of the guide block close to the middle of the circular hole for quickly placing the FDM base plate between the multiple guide blocks.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The FDM base plate installation structure of the 3D printing device can make the FDM base plate placed on the upper surface of the support plate in a horizontal state by rotating multiple support plates in the same direction, thereby avoiding the problem of deformation and tilt of the FDM base plate caused by the existing method of adjusting the horizontality of the FDM base plate by the pre-tightening force of the bolts, and further ensuring the printing quality of the 3D product; The number of support plates is preferably , and the two first connecting rods and the two second connecting rods enclose a rectangle, so that there are two support plates closer to the center of the target area, increasing the contact area between the support plates and the FDM bottom plate, making the FDM bottom plate more stable; When the edges of all the support plates are close to each other and enter the top of the circular hole, the FDM base plate is manually placed between the multiple guide blocks. The FDM base plate naturally falls down by gravity and fits on the top of each support plate. The guide blocks can limit the FDM base plate from sliding on the surface of each support plate, and then 3D printing begins; when 3D printing is completed, the edges of the support plates are controlled to move away from each other, and the FDM base plate and the 3D printed product simultaneously pass through the circular hole and fall onto the tray, raising the height of the substrate, so that the FDM base plate and the 3D printed product can leave the substrate and the printing area; By controlling the extension (or contraction) of the horizontal push rod, the lower rack drives the gear to rotate counterclockwise (or clockwise), and the gear engages the upper rack so that the upper rack drives the tray to move out of (or into) the chassis, so that the FDM base plate and the printed 3D product can be moved out of the chassis, and the tray can also be reset. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A perspective view of the present invention; Figure 2 It is a schematic diagram of the connection between the support plate and the connecting rod of the present invention; Figure 3 for Figure 2 A top view of Figure 4 for Figure 2 The main view; Figure 5 for Figure 2 A partial enlarged view of Figure 6 for Figure 2 Exploded diagram of Figure 7 is a schematic diagram of a support plate of the present invention; Figure 8 for Figure 1 Front section view at AA; Fig. 9 is a bottom view schematic diagram of the substrate of the present invention; Fig.10 for Figure 1 Sectional view at AA in the middle; Fig.11 for Figure 1 Front section view at the middle BB; Fig.12 It is a schematic diagram of the assembly of the chassis and the tray of the present invention; Fig.13 for Figure 1 Bottom view of Fig.14 It is a schematic diagram of the connection between the tray and the limiting ring; Fig.15 It is a first modeling schematic diagram of the present invention; Fig.16 This is a second modeling schematic diagram of the present invention.

[0017] Description of reference numerals: 1. Chassis, 2. Base plate, 3. FDM bottom plate, 4. Traction piece, 5. Support plate, 6. Connecting rod, 7. Strip plate, 8. Connecting plate, 9. Arc surface, 10. First connecting rod, 11. Second connecting rod, 12. Round hole, 13. Guide block, 14. Tray, 15. Double-headed screw, 16. Slide hole, 17. Nut slider, 18. Rotating rod, 19. Horizontal rod, 20. Guide groove, 21 Vertical guide rail, 22. Horizontal slide rail, 23. Upper rack, 24. Gear, 25. Horizontal push rod, 26. Lower rack, 27. First pulley, 28. Belt, 29. Second pulley, 30. Limiting ring. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Unless otherwise defined, the technical or scientific terms used herein shall have the usual meanings understood by persons of ordinary skill in the field to which the present invention belongs. "Include" or "comprises" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Inside", "outside", "upper", "lower", "far", "near", "front", "back", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0020] The drawings in the present invention are not drawn strictly according to the actual scale, and the specific size and quantity of each structure can be determined according to actual needs. The drawings described in the present invention are only schematic diagrams of the structures.

[0021] The present invention provides an FDM base plate mounting structure for a 3D printing device, such as Figure 1-Figure 7 and Figure 15-16 The 3D printing device comprises: a chassis 1, a base plate 2 and a circular FDM base plate 3, wherein the base plate 2 and the FDM base plate 3 are both located in the chassis 1, and the base plate 2 has a target area for placing the FDM base plate 3, and the FDM base plate mounting structure of the 3D printing device also includes a limiting mechanism, wherein the limiting mechanism includes: a plurality of support plates 5, a plurality of connecting rods 6 and a traction member 4; the plurality of support plates 5 are arranged around the center of the target area, and each support plate 5 is rotatably connected to the base plate 2, and the upper surfaces of the plurality of support plates 5 are all located in the same horizontal plane, and after the support plates 5 rotate simultaneously, the ends of the plurality of support plates 5 They all approach or move away from the center of the target area, and are used to simultaneously support or release the FDM base plate 3, and each support plate 5 has a connection point on the surface on both sides of its rotation center; the number of multiple connecting rods 6 is the same as the number of multiple support plates 5, and the two ends of each connecting rod 6 are respectively rotated to connect the connection points on two adjacent support plates 5, driving the multiple support plates 5 to rotate simultaneously; the traction member 4 includes a fixed end and a movable end, the fixed end is connected to the base plate 2, and the movable end is rotated to connect the middle part of any one of the connecting rods 6, so that the multiple support plates 5 can be driven to rotate in the same direction after the mobile end is actuated.

[0022] The diameter of the FDM base plate 3 is 30cm, and the thickness of the support plate 5 is 5mm-15mm. The connecting rod 6 here is preferably a flat plate, and the traction member 4 is an electric push rod. The multiple support plates 5 and the multiple connecting rods 6 in the FDM base plate mounting structure of the present 3D printing device are rotated and connected in sequence to form a closed structure, and the multiple support plates 5 are also rotatably connected to the base plate 2, so that after the moving end of the traction member 4 drives one of the connecting rods 6 to move, the connecting rod 6 drives the adjacent support plate 5 to rotate, and after the support plate 5 rotates, it drives the adjacent connecting rod 6 to move, and so on, until all the support plates 5 rotate in the same direction and the same angle, after all the support plates 5 rotate forward (or reverse), the edges of all the support plates 5 are close to each other (or away from each other) at the same time, when the edges of all the support plates 5 are close to each other, it is convenient to place the FDM base plate 3 above the edges of all the support plates 5, because the upper surfaces of all the support plates 5 are located on the same horizontal plane, so when the FDM base plate 3 is placed above the edges of all the support plates 5, the FDM base plate 3 can also be guaranteed to be horizontal.

[0023] The electric push rod contracts and drives the connecting rod 6 to move, thereby enabling the multiple support plates 5 to horizontally support the FDM plate or allowing the FDM plate to fall off or drop from the multiple support plates 5, thereby avoiding the problem of interference between the printing end and the sheet-like support plate 5 when the printing end of the 3D printing device is printing.

[0024] Therefore, the FDM base plate mounting structure of the present 3D printing device can make the FDM base plate 3 placed on the upper surface of the support plate 5 in a horizontal state by rotating multiple support plates 5 in the same horizontal plane in the same direction, thereby avoiding the existing method of adjusting the horizontality of the FDM base plate 3 by the pre-tightening force of the bolts, which causes the FDM base plate 3 to deform and tilt, and further ensures the printing quality of the 3D product.

[0025] As an example, Figure 5-Figure 7 The support plate 5 includes: a strip plate 7 and a connecting plate 8; the middle part of the strip plate 7 is rotatably arranged on the base plate 2, a curved surface 9 is provided at one of the corners of the strip plate 7, and an end of the strip plate 7 away from the curved surface 9 has a connecting point; the connecting plate 8 is fixedly connected to one side of the middle part of the strip plate 7 close to the arc center angle of the curved surface 9, and has a connecting point on the connecting plate 8.

[0026] The arc surface 9 is used to prevent interference between the multiple strip plates 7 after rotation. The connecting plate 8 is a square. The length of the strip plate 7 is 15cm-25cm and is 3 times the side length of the square. The width and thickness of the connecting plate 8 and the strip plate 7 are equal, and the thickness value is 3mm-10mm. In addition, the connecting plate 8 and the strip plate 7 are chamfered to avoid interference.

[0027] As an example, Figure 2-Figure 3 The number of the support plates 5 is 4; the multiple connecting rods 6 include two first connecting rods 10 and two second connecting rods 11, and the two connection points on each of the support plates 5 are respectively connected to the end of a first connecting rod 10 and the end of a second connecting rod 11, so that the two first connecting rods 10 and the two second connecting rods 11 form a rectangle, and the movable end of the traction member 4 is rotatably connected to the middle part of the first connecting rod 10 or the middle part of the second connecting rod 11.

[0028] The number of support plates 5 is preferably 4. The purpose of enclosing a rectangle with two first connecting rods 10 and two second connecting rods 11 is to make two support plates 5 closer to the center of the target area, increase the contact area between the support plates 5 and the FDM base plate 3, and make the FDM base plate 3 more stable.

[0029] As an example, Figure 8-Figure 10A circular hole 12 is provided on the target area of ​​the substrate 2, and a plurality of vertical guide blocks 13 are fixedly provided on the surface of the substrate 2 around the contour edge of the circular hole 12, and the sides of the plurality of vertical guide blocks 13 are slidably connected to the circumferential surface of the FDM base plate 3; the FDM base plate mounting structure of the 3D printing device also includes a lifting mechanism, which is located below the substrate 2, and the lifting end of the lifting mechanism is connected to the substrate 2, and a tray 14 for receiving the FDM base plate 3 is provided below the substrate 2.

[0030] The diameter of the circular hole 12 is the same as that of the FDM base plate 3, both of which are 30 cm. When the edges of all the support plates 5 are close to each other and enter above the circular hole 12, the FDM base plate 3 is manually placed between multiple guide blocks 13. The FDM base plate 3 naturally falls by gravity and fits on top of each support plate 5. The guide blocks 13 can limit the FDM base plate 3 from sliding on the surface of each support plate 5, and then 3D printing is started; when the 3D printing is completed, the edges of the support plates 5 are controlled to move away from each other, and the FDM base plate 3 and the 3D printed products simultaneously pass through the circular hole 12 and fall on the tray 14, raising the height of the substrate 2, so that the FDM base plate 3 and the 3D printed products can leave the substrate 2 and the printing area.

[0031] As an example, Figure 1 , Figure 8 and Figure 15-16 The lifting mechanism includes: a double-headed screw 15, two nut sliders 17 and two rotating rods 18; the threads at both ends of the double-headed screw 15 are rotated in opposite directions and are rotatably arranged on the outer bottom of the chassis 1, and a sliding hole 16 located on the same straight line is provided on the bottom wall of the chassis 1, and the length direction of the sliding hole 16 is parallel to the double-headed screw 15; the two nut sliders 17 are respectively threadedly connected to the two ends of the double-headed screw 15; the two rotating rods 18 correspond to one nut slider 17, and the nut slider 17 is rotatably connected to one end of the rotating rod 18, and the other end of the rotating rod 18 passes through the sliding hole 16 on the corresponding side and is rotatably connected to the lower surface of the substrate 2.

[0032] After the double-headed screw 15 rotates, the two nut sliders 17 synchronously approach or move away from each other, so that the two rotating rods 18 rotate simultaneously, and the two rotating rods 18 drive the substrate 2 to rise and fall simultaneously. Since the two rotating rods 18 rotate synchronously at the same angle, the lifting speeds on both sides of the substrate 2 are also the same, which can ensure that the substrate 2 and the FDM base plate 3 remain level at the same time.

[0033] As an example, Figure 4 and Fig. 9Two horizontal rods 19 are fixedly provided on the lower surface of the base plate 2. The horizontal rods 19 are parallel and symmetrically arranged on both sides of the circular hole 12. The middle part of each horizontal rod 19 is rotatably connected to the end of the rotating rod 18 on the corresponding side; guide grooves 20 are provided on the opposite side edges of the base plate 2, and the guide grooves 20 are slidably connected to the vertical guide rails 21 arranged on the inner side of the chassis 1.

[0034] The two horizontal rods 19 are connected to the base plate 2 at four points in total, and the base plate 2 is more stable when the two horizontal rods 19 move up and down synchronously.

[0035] As an example, Figure 1 and Figure 10-12 The side of the chassis 1 is provided with a cabinet door 21, and the inner bottom surface of the chassis 1 is provided with a delivery mechanism for delivering the tray 14 to the direction of the cabinet door 21, and the delivery mechanism includes: two horizontal slide rails 22, an upper rack 23, a gear 24, a horizontal push rod 25 and a lower rack 26; the two horizontal slide rails 22 are arranged parallel to each other on the inner bottom surface of the chassis 1, and the horizontal slider slidably arranged on each horizontal slide rail 22 is fixedly connected to the tray 14; the upper rack 23 is fixedly connected to the bottom surface of the tray 14, and the length direction of the upper rack 23 is parallel to the horizontal slide rail 22; the gear 24 meshes with the upper rack 23; one end of the horizontal push rod 25 is fixedly connected to the chassis 1, and the other end is rotatably connected to the gear 24, and the extension direction of the horizontal push rod 25 is parallel to the horizontal slide rail 22; the lower rack 26 meshes with the gear 24 and is parallel to the horizontal slide rail 22.

[0036] By controlling the horizontal push rod 25 to extend (or contract), the lower rack 26 drives the gear 24 to rotate counterclockwise (or clockwise), and the gear 24 engages the upper rack 23 so that the upper rack 23 drives the tray 14 to move out of (or into) the chassis 1, so that the FDM base plate 3 and the printed 3D product can be moved out of the chassis 1, and the tray 14 can also be reset.

[0037] As an example, Fig.11 and Fig.13 A first pulley 27 is fixedly provided in the middle of the double-headed screw 15 . The first pulley 27 is connected to a second pulley 29 via a belt 28 . The second pulley 29 is fixedly provided on the output shaft of the motor, and the motor is fixed on the chassis 1 .

[0038] The motor is preferably a stepper motor, which drives the double-headed screw 15 through a belt-pulley transmission, and the lifting height of the substrate 2 is adjusted by controlling the number of rotations of the stepper motor.

[0039] As an example, Fig.12 and Fig.14A limiting ring 30 is fixedly disposed on the upper surface of the tray 14 . The limiting ring 30 is coaxial with the FDM base plate 3 , and the inner diameter of the limiting ring 30 is greater than the diameter of the FDM base plate 3 .

[0040] The inner diameter of the limiting ring 30 is larger than the diameter of the FDM base plate 3, specifically 30cm-35cm, in order to allow the FDM base plate 3 and the 3D printed product to fall into the middle of the limiting ring 30, preventing the FDM base plate 3 and the 3D printed product from falling during the process of being moved out of the chassis 1.

[0041] As an example, Figure 2 and Figure 4 A transition arc is provided on the side surface of the upper end of the guide block 13 near the middle of the circular hole 12 for quickly placing the FDM base plate 3 between the multiple guide blocks 13 .

[0042] The method of using the FDM base plate mounting structure of a 3D printing device of the present invention is as follows: First, the operator controls the traction member 4 to retract, and the multiple connecting rods 6 drive the multiple supporting plates 5 to rotate and approach each other, and the ends of the multiple supporting plates 5 are all extended into the range of the circular hole 12; Then, the box door 21 is opened, and the FDM base plate 3 is manually placed horizontally between the multiple guide blocks 13, and the sliding of the FDM base plate 3 is restricted. The FDM base plate 3 is attached to the upper surfaces of the multiple support plates 5 to keep it horizontal, and the box door 21 is closed to start 3D printing; Next, the 3D product is printed, and the motor is controlled to rotate forward, so that the FDM base plate 3 and the 3D printed product are lowered, and the traction member 4 is controlled to extend and reset, and the multiple support plates 5 rotate and move away from each other, and the FDM base plate 3 and the 3D printed product fall downward, pass through the circular hole 12, and fall into the range of the limit ring 30 on the tray 14; Finally, open the box door 21, operate the horizontal push rod 25 to extend, the tray 14 sends out the FDM base plate 3 and the 3D printed product, manually remove the FDM base plate 3 and the 3D print, control the horizontal push rod 25 to shorten and reset, control the motor to reverse, raise and reset the substrate 2, and close the box door 21.

[0043] The above shows and describes the basic principles, main features and advantages of the present invention. Technical personnel in this industry should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An FDM base plate mounting structure of a 3D printing device, comprising a chassis (1), a base plate (2) and a circular FDM base plate (3), wherein the base plate (2) and the FDM base plate (3) are both located in the chassis (1), and the base plate (2) has a target area for placing the FDM base plate (3), characterized in that: The FDM base plate mounting structure of the 3D printing device also includes a limiting mechanism, and the limiting mechanism includes: A plurality of support plates (5) are arranged around the center of the target area, and each support plate (5) is rotatably connected to the base plate (2), the upper surfaces of the plurality of support plates (5) are located on the same horizontal plane, and after the support plates (5) rotate simultaneously, the ends of the plurality of support plates (5) move closer to or farther from the center of the target area, so as to simultaneously support or release the FDM base plate (3), and each support plate (5) has a connection point on the surface on both sides of its rotation center; A plurality of connecting rods (6), the number of which is the same as the number of the plurality of support plates (5), and the two ends of each connecting rod (6) are respectively rotatably connected to the connection points on two adjacent support plates (5), thereby driving the plurality of support plates (5) to rotate simultaneously; The traction member (4) comprises a fixed end and a movable end, wherein the fixed end is connected to the base plate (2), and the movable end is rotatably connected to the middle part of any connecting rod (6), so that the movement of the movable end drives the plurality of support plates (5) to rotate in the same direction.

2. The FDM base plate mounting structure of a 3D printing device according to claim 1, characterized in that: The support plate (5) comprises: A strip plate (7), the middle portion of which is rotatably arranged on the base plate (2), a curved surface (9) being provided at one of the corners of the strip plate (7), and an end of the strip plate (7) away from the curved surface (9) having a connection point; A connecting plate (8) is fixedly connected to the middle of the strip plate (7) on one side close to the arc center angle of the arc surface (9), and the connecting plate (8) has a connecting point.

3. The FDM base plate mounting structure of a 3D printing device according to claim 1, characterized in that: The number of the support plates (5) is 4; The plurality of connecting rods (6) include two first connecting rods (10) and two second connecting rods (11), and the two connecting points on each of the support plates (5) are respectively connected to the end of a first connecting rod (10) and the end of a second connecting rod (11), so that the two first connecting rods (10) and the two second connecting rods (11) enclose a rectangle, and the movable end of the traction member (4) is rotatably connected to the middle of the first connecting rod (10) or the middle of the second connecting rod (11).

4. The FDM base plate mounting structure of a 3D printing device according to claim 1, characterized in that: A circular hole (12) is provided on the target area of ​​the substrate (2); a plurality of vertical guide blocks (13) are fixedly provided on the surface of the substrate (2) around the contour edge of the circular hole (12); and the sides of the plurality of vertical guide blocks (13) are slidably connected to the circumferential surface of the FDM base plate (3); The FDM base plate mounting structure of the 3D printing device further comprises a lifting mechanism, the lifting mechanism is located below the base plate (2), and the lifting end of the lifting mechanism is connected to the base plate (2), and a tray (14) for receiving the FDM base plate (3) is provided below the base plate (2).

5. The FDM base plate mounting structure of a 3D printing device as claimed in claim 4, characterized in that: The lifting mechanism comprises: A double-headed screw (15) having threads at both ends with opposite rotation directions and is rotatably arranged on the outer bottom of the chassis (1); a sliding hole (16) located on the same straight line is provided on the bottom wall of the chassis (1); and the length direction of the sliding hole (16) is parallel to the double-headed screw (15); Two nut sliders (17) are respectively threadedly connected to two ends of the double-headed screw (15); The two rotating rods (18) respectively correspond to one of the nut sliders (17); the nut slider (17) is rotationally connected to one end of the rotating rod (18); the other end of the rotating rod (18) passes through the sliding hole (16) on the corresponding side and is rotationally connected to the lower surface of the base plate (2).

6. The FDM base plate mounting structure of a 3D printing device as claimed in claim 5, characterized in that: Two horizontal rods (19) are fixedly provided on the lower surface of the base plate (2), the horizontal rods (19) are arranged parallel and symmetrically on both sides of the circular hole (12), and the middle part of each horizontal rod (19) is rotatably connected to the end of the rotating rod (18) on the corresponding side; Guide grooves (20) are provided on opposite side edges of the base plate (2), and the guide grooves (20) are slidably connected to vertical guide rails (21) provided on the inner side of the chassis (1).

7. The FDM base plate mounting structure of a 3D printing device according to claim 4, characterized in that: The side of the case (1) is provided with a case door (21), and the inner bottom surface of the case (1) is provided with a delivery mechanism for delivering the tray (14) in the direction of the case door (21), the delivery mechanism comprising: Two horizontal slide rails (22) are arranged parallel to each other on the inner bottom surface of the chassis (1), and a horizontal sliding block slidably arranged on each horizontal slide rail (22) is fixedly connected to the tray (14); An upper rack (23) is fixedly connected to the bottom surface of the tray (14), and the length direction of the upper rack (23) is parallel to the horizontal slide rail (22); A gear (24) meshing with the upper rack (23); A horizontal push rod (25), one end of which is fixedly connected to the chassis (1) and the other end of which is rotatably connected to the gear (24); the telescopic direction of the horizontal push rod (25) is parallel to the horizontal slide rail (22); The lower rack (26) meshes with the gear (24) and is parallel to the horizontal slide rail (22).

8. The FDM base plate mounting structure of a 3D printing device as claimed in claim 5, characterized in that: A first belt pulley (27) is fixedly provided in the middle of the double-headed screw (15); the first belt pulley (27) is connected to a second belt pulley (29) via a belt (28); the second belt pulley (29) is fixedly provided on the output shaft of the motor; and the motor is fixed on the chassis (1).

9. The FDM base plate mounting structure of a 3D printing device according to claim 7, characterized in that: A limiting ring (30) is fixedly provided on the upper surface of the tray (14); the limiting ring (30) is coaxial with the FDM base plate (3), and the inner diameter of the limiting ring (30) is greater than the diameter of the FDM base plate (3).

10. The FDM base plate mounting structure of a 3D printing device according to claim 4, characterized in that: A transition arc is provided on the side surface of the upper end of the guide block (13) close to the middle of the circular hole (12) for quickly placing the FDM base plate (3) between the multiple guide blocks (13).

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