Platform stripping structure for 3D printer

Abstract

The invention relates to the technical field of stripping, and discloses a platform stripping structure for a 3D printer, the platform stripping structure comprises a printer body and a bottom base arranged at the bottom of the printer body, a transverse plate is transversely arranged in the printer body, a polygonal hole is formed in the transverse plate, and a plurality of downward pressing triangular plates are arranged in the polygonal hole in a circumferential overturning mode. A material is printed on the downward-pressing triangular plates, and connecting parts connected with the downward-pressing triangular plates in a one-to-one mode are arranged on the bottom base in the circumferential direction. After a plurality of downward pressing triangular plates are separated from the material base in batches, the downward pressing triangular plates are reset again to support materials, and therefore the problem that the materials topple over due to the fact that the base is unstable can be effectively avoided; and meanwhile, in the process that one downward-pressing triangular plate is overturned and descended, every two adjacent downward-pressing triangular plates are still in the horizontal state, and therefore supporting can be better provided for the downward-pressing overturning downward-pressing triangular plates to be separated from the material base.

Description

Technical Field

[0001] The present invention relates to the technical field of material removal, and particularly to a platform material removal structure for a 3D printer. Background Art

[0002] After the existing 3D printer platform finishes printing, the printed object is easily damaged during peeling. Although there are already devices for assisting in material pushing in the existing technology, when the existing devices push and peel the printed object, the driving force is in one direction, so there are certain limitations, and the printed object will still be damaged during peeling. At the same time, there are also some material removal devices that peel from the bottom, but during the peeling process from the bottom, a soft bottom such as a rubber bottom sheet is usually provided. This laying method often causes the bottom of the 3D printed material to be unstable. Since the bottom is a flexible base, as the 3D printing progresses, the material will continuously squeeze the rubber bottom sheet, thereby causing the 3D printed material to tilt.

[0003] At the same time, if a rigid base is used, there will be problems with difficult peeling. If external force is used to shake and peel, the material will be damaged, and at the same time, the 3D printed material will stick to the base, and forced peeling will cause damage to the base.

[0004] Therefore, we designed a platform material removal structure for a 3D printer. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems that when external force is used to shake and peel, the material will be damaged, and at the same time, the 3D printed material will stick to the base, and forced peeling will cause damage to the base, and a platform material removal structure for a 3D printer is proposed.

[0006] In order to achieve the above purpose, the present invention adopts the following technical scheme:

[0007] A platform material removal structure for a 3D printer includes a printer body and a bottom base provided at the bottom of the printer body. A horizontal plate is horizontally arranged in the printer body, and a polygonal hole is opened on the horizontal plate. A plurality of pressing triangular plates are circumferentially flipped in the polygonal hole, and a printed material is located on the pressing triangular plates. A connecting portion connected to the pressing triangular plates one by one is circumferentially arranged on the bottom base. A plurality of deformation material removal portions for deforming the contact surface between the pressing triangular plates and the material are provided in the pressing triangular plates.

[0008] Preferably, the pressing triangular plate is an isosceles triangle, and a second rotating shaft is fixed on one side of the bottom edge of the pressing triangular plate. The pressing triangular plate rotates on the side wall of the polygonal hole through a rotating groove and the second rotating shaft.

[0009] Preferably, the bottom base is a cylindrical base, and its outer sidewall is circumferentially provided with pressing grooves corresponding to the positions of the downward pressing triangular plates one by one. The connecting part slides up and down in the pressing grooves, and the other end of the connecting part is connected to the bottom of the downward pressing triangular plate.

[0010] Preferably, the connecting part includes:

[0011] A downward slider that slides in the pressing groove. An L-shaped plate is provided below the downward slider, and the L-shaped plate is connected to the downward slider through a second connecting rod.

[0012] A first connecting rod, both ends of which are rotatably connected to the downward slider and the downward pressing triangular plate through first rotating shafts.

[0013] Preferably, a rotating ring rotates on the outer sidewall of the bottom base, and a first rotating gear is coaxially fixed on the outer sidewall of the rotating ring. A protruding plate is fixed at the bottom of the rotating ring. An electric hydraulic cylinder is fixed on the inner wall of the printer body, and a first rack meshing with the first rotating gear is fixed at the output end of the electric hydraulic cylinder.

[0014] Preferably, the L-shaped plate is located below the rotating ring. A bracket is fixed on the outer sidewall of the bottom base, and a first return spring is arranged between the L-shaped plate and the bracket. The protruding plate is located between two adjacent L-shaped plates.

[0015] Preferably, an inner cavity is formed in the downward pressing triangular plate, and a pull rope is fixed on the sidewall of the polygonal hole and extends into the inner cavity. The pull rope extends into the inner cavity through a wire hole formed in the sidewall of the downward pressing triangular plate.

[0016] Preferably, the deformation and material removal part includes:

[0017] A metal thin plate, which is the top plate of the downward pressing triangular plate. A plurality of staggered racks for flatly lifting the metal thin plate are provided at the bottom of the metal thin plate, and the plurality of staggered racks are linearly arranged in the inner cavity.

[0018] Below the staggered racks, a plurality of jacking parts are provided. A rack stabilizing frame is arranged in the inner cavity, and a sliding plate slides on the rack stabilizing frame. One end of the sliding plate is provided with a second rack meshing with the jacking parts, and the other end of the sliding plate is fixed with an end block connected to the pull rope. A second return spring for resetting the second rack is arranged between the end block and the inner cavity.

[0019] Preferably, the staggered rack includes a fixing plate and a lifting plate. The fixing plate is fixed in the inner cavity, and the lifting plate moves up and down between two adjacent fixing plates. The jacking part is located below the lifting plate.

[0020] Preferably, the jacking part includes:

[0021] A fixed shaft is fixed inside the inner cavity. A second rotating gear is coaxially sleeved on the fixed shaft, and the second rotating gear is in meshing transmission with a second rack.

[0022] Two elliptical plates are coaxially fixed on both sides of the second rotating gear.

[0023] The beneficial effects of the present invention are as follows:

[0024] 1. The present invention separates multiple pressing triangular plates from the material base in batches and then resets to lift the material again, which can effectively avoid the problem of the material tipping over due to the instability of the base. At the same time, during the process of one pressing triangular plate flipping and descending, the adjacent two pressing triangular plates are still in a horizontal state, which can better provide support for the pressing triangular plate that is flipping and descending to better separate from the material base.

[0025] 2. The two elliptical plates of the present invention abut against the bottom of the lifting plate. When the fixing plate and the lifting plate are flush, the sides where the minor axes of these two elliptical plates are located abut against the bottom of the lifting plate. When the second rack slides to drive the second rotating gear to rotate and drives the elliptical plates to rotate, at this time, the elliptical plates will push up the lifting plate, and then will push up the upper metal thin plate, causing the originally flat metal thin plate to have wrinkles. In this way, better material removal can be achieved, enabling the material that was originally adhered to the metal thin plate to have wrinkles and separate, avoiding the problem of pulling deformation due to adhesion, and enabling the material to be quickly and conveniently removed without damaging the originally printed material. Description of the Drawings

[0026] Figure 1 is a schematic structural diagram of a platform material removal structure for a 3D printer proposed by the present invention;

[0027] Figure 2 is a front view of a platform material removal structure for a 3D printer proposed by the present invention;

[0028] Figure 3 is Figure 2 an enlarged structural view of part A in

[0029] Figure 4 is a schematic diagram of the flipping state of a single-piece pressing triangular plate in a platform material removal structure for a 3D printer proposed by the present invention;

[0030] Figure 5 is a schematic diagram of the flipping state of a pressing triangular plate in a polygon hole in a platform material removal structure for a 3D printer proposed by the present invention;

[0031] Figure 6 is a schematic cross-sectional structure diagram of a pressing triangular plate in a platform material removal structure for a 3D printer proposed by the present invention;

[0032] Figure 7 For Figure 6 the enlarged view of the structure at position B in

[0033] Figure 8 is the side sectional view of the lower pressing triangular plate in the platform material discharging structure for a 3D printer proposed by the present invention.

[0034] In the figure: 1, printer body; 2, horizontal plate; 3, polygonal hole; 4, lower pressing triangular plate; 5, bottom base; 6, electric hydraulic cylinder; 7, first rack; 8, rotating ring; 9, first rotating gear; 10, protruding plate; 11, lower pressing groove; 12, sliding block; 13, first connecting rod; 14, first rotating shaft; 15, second connecting rod; 16, L-shaped plate; 17, first return spring; 18, pulling rope; 19, rotating groove; 20, second rotating shaft; 21, inner cavity; 22, metal thin plate; 23, fixing plate; 24, lifting plate; 25, second rack; 26, rack stabilizing frame; 27, sliding plate; 28, end block; 29, second return spring; 30, fixed shaft; 31, elliptical plate; 32, second rotating gear; 33, pulling wire hole. Specific implementation mode

[0035] Referring to Figures 1 - 8 , a platform material discharging structure for a 3D printer includes a printer body 1 and a bottom base 5 arranged at the bottom of the printer body 1. A horizontal plate 2 is horizontally arranged in the printer body 1, and a polygonal hole 3 is opened on the horizontal plate 2. A plurality of lower pressing triangular plates 4 are circumferentially flipped in the polygonal hole 3, and printing materials are placed on the lower pressing triangular plates 4. It should be noted that this setting can ensure that the plurality of lower pressing triangular plates 4 are flush with the horizontal plate 2, providing a platform space for the printing materials. At the same time, since the lower pressing triangular plates 4 rotate unidirectionally in the polygonal hole 3 and the first return spring 17 is in a compressed state, there is always a tendency to rotate under the action of the first return spring 17. Under the action of the lower pressing triangular plates 4 against the polygonal hole 3, the maximum lifting height of the lower pressing triangular plates 4 is flush with the horizontal plate 2, providing a platform for the printing of materials.

[0036] Referring to Figure 4 and Figure 5 state, the lower pressing triangular plate 4 is an isosceles triangle, and a second rotating shaft 20 is fixed on one side of the bottom edge of the lower pressing triangular plate 4. The lower pressing triangular plate 4 rotates on the side wall of the polygonal hole 3 through the rotating groove 19 and the second rotating shaft 20. Therefore, it is ensured that the lower pressing triangular plate 4 can be pulled downward under the action of the connecting part and cannot flip upward beyond the horizontal plane.

[0037] The bottom base 5 is provided with connecting parts arranged in a circle and connected to the pressing triangular plates 4 one by one. The bottom base 5 is a cylindrical base, and its outer sidewall is provided with pressing grooves 11 corresponding to the positions of the pressing triangular plates 4 in a circle. The connecting parts slide up and down in the pressing grooves 11, and the other ends of the connecting parts are connected to the bottoms of the pressing triangular plates 4. In this way, when the connecting parts in the pressing grooves 11 are pressed downward by an external force, the corresponding pressing triangular plates 4 can be driven to be pressed downward in sequence.

[0038] It should be noted that in this technical solution, multiple pressing triangular plates 4 arranged in a circle are pressed downward in sequence, so that the individual pressing triangular plates 4 are separated from the material base in sequence. In this way, not only can the dematerialization effect of the pressing triangular plates 4 and the material be effectively realized, but also the effect of stabilizing the material can be achieved, avoiding the simultaneous downward swing of multiple pressing triangular plates 4, so that the overall multiple pressing triangular plates 4 are simultaneously separated from the material base, thereby causing the dumping of the material.

[0039] Refer to Figures 1 - 3 In the state, the connecting part includes a sliding block 12. The sliding block 12 slides in the pressing groove 11. An L-shaped plate 16 is provided below the sliding block 12, and the L-shaped plate 16 is connected to the sliding block 12 through a second connecting rod 15. In this way, when the L-shaped plate 16 is pressed and lowered, the sliding block 12 can be driven to descend together through the second connecting rod 15. A bracket is fixed on the outer sidewall of the bottom base 5, and a first return spring 17 is arranged between the L-shaped plate 16 and the bracket, and the lower first return spring 17 is compressed to store energy.

[0040] Among them, multiple first return springs 17 act on the bottom of the pressing triangular plate 4 and push the pressing triangular plate 4 to be in a horizontal state, which can provide a stable platform for the printing of lighter materials.

[0041] The connecting part further includes a first connecting rod 13. Both ends of the first connecting rod 13 are rotatably connected to the sliding block 12 and the pressing triangular plate 4 through first rotating shafts 14. In this way, when the sliding block 12 is pressed downward, the corresponding pressing triangular plate 4 above can be stably driven to be pressed downward, and then the pressing triangular plate 4 is separated from the bottom of the material.

[0042] Refer to Figure 3 In the state, a rotating ring 8 is rotatably arranged on the outer sidewall of the bottom base 5, and a first rotating gear 9 is coaxially fixed on the outer sidewall of the rotating ring 8. An electric hydraulic cylinder 6 is fixed on the inner wall of the printer body 1, and a first rack 7 meshing with the first rotating gear 9 is fixed on the output end of the electric hydraulic cylinder 6. In this way, after starting the electric hydraulic cylinder 6, the first rack 7 will be pushed, and the first rack 7 will be engaged with the first rotating gear 9 for transmission, thereby driving the rotating ring 8 to rotate. Therefore, the protruding plate 10 fixed to the bottom of the rotating ring 8 will be driven to rotate around the outer sidewall of the bottom base 5.

[0043] A protruding plate 10 is fixed at the bottom of the rotating ring 8, and the L-shaped plate 16 is located below the rotating ring 8. The protruding plate 10 is located between two adjacent L-shaped plates 16. It should be noted that as the rotating ring 8 rotates around the outer wall of the bottom base 5 with the protruding plate 10 at the bottom, both sides of the protruding plate 10 have arc edges during the rotation process, which can better squeeze the L-shaped plate 16 down, and drive the second connecting rod 15 to pull the lower slider 12 to move down, thereby completing the rotation of the downward pressing triangle plate 4.

[0044] It should be noted that the rotating ring 8 rotates around the outer wall of the bottom base 5 with the protruding plate 10 at the bottom, and does not descend with all the L-shaped plates 16, but rather the downward pressing triangular plates 4 descend and flip in sequence, that is, when the protruding plate 10 squeezes one of the L-shaped plates 16 to descend, it will also cause the corresponding downward pressing triangular plate 4 to be pressed down and flipped, while the remaining downward pressing triangular plates 4 remain in a horizontal state; when the protruding plate 10 squeezes over the L-shaped plate 16 and continues to squeeze toward the next L-shaped plate 16, the originally squeezed L-shaped plate 16 is reset under the action of the first reset spring 17, and is lifted up with the upper lower slider 12, and causes the downward pressing triangular plate 4 to flip upward and again press against the bottom of the material, and the L-shaped plate 16 adjacent to the descending L-shaped plate 16 will be pressed down, thereby realizing the situation where the circular downward pressing triangular plates 4 descend in sequence.

[0045] However, the bottom of the material and the top of the pressing triangle plate 4 are no longer stuck together as before. Conventional printing materials will stick to the base. If the material is directly removed by shaking and pulling upwards, the material will be deformed and the base will be damaged.

[0046] However, the present technical solution adopts a method of separating the base from the material base in batches, that is, dividing the original whole base into multiple parts. For these multiple parts, multiple downward pressing triangular plates 4 are lowered in sequence, which can slowly peel off the base and the material base in multiple areas. At the same time, the slow peeling in sequence can better avoid the problem of material deformation caused by artificial clamping on the material surface.

[0047] Secondly, multiple downward pressing triangle plates 4 are separated from the material base in batches, and the materials are reset and supported, which can effectively avoid the problem of material tipping over due to the instability of the base; at the same time, when one of the downward pressing triangle plates 4 is flipped and lowered, the two adjacent downward pressing triangle plates 4 are still in a horizontal state, which can better provide support for the downward pressing triangle plate 4 that is flipped and separated from the material base.

[0048] Reference Figures 6 - 8State, there are multiple deformation and material removal parts in the lower pressing triangular plate 4 that cause the contact surface between the lower pressing triangular plate 4 and the material to deform. The deformation and material removal parts include a thin metal plate 22. The thin metal plate 22 is the top plate of the lower pressing triangular plate 4. There are multiple staggered racks at the bottom of the thin metal plate 22 for lifting the thin metal plate 22 flush. And the multiple staggered racks are linearly arranged in the inner cavity 21. The function of the thin metal plate 22 is not only to provide a stable placement platform for the material. Supported by the staggered racks, the thin metal plate 22 is lifted, so that the material placed on the thin metal plate 22 will not collapse. Secondly, with the movement of the staggered racks, the corresponding area of the thin metal plate 22 can be driven to vibrate, and the material base can be better separated from the thin metal plate 22.

[0049] Refer to Figure 7 State, the staggered rack includes a fixed plate 23 and a lifting plate 24. The fixed plate 23 is fixed in the inner cavity 21, and the lifting plate 24 moves up and down between two adjacent fixed plates 23. This setting ensures that the fixed plate 23 and the lifting plate 24 in the flush state provide support for the thin metal plate 22.

[0050] There are multiple jacking parts below the staggered rack. The jacking parts are located below the lifting plate 24 and are in contact with the bottom of the lifting plate 24. In this way, with the movement of the jacking parts, the lifting plate 24 in contact with the jacking parts will be driven to move together, and then the original flush state of the fixed plate 23 and the lifting plate 24 can be broken, so that the fixed plate 23 and the lifting plate 24 are in a staggered state, and then the originally flat thin metal plate 22 will be in a state of high and low staggering, making the material originally adhered to the surface of the thin metal plate 22 better removed from the material.

[0051] There is a rack stabilizing frame 26 in the inner cavity 21, and a sliding plate 27 slides on the rack stabilizing frame 26. One end of the sliding plate 27 is provided with a second rack 25 that meshes with the jacking part, which can provide support for the stable sliding of the sliding plate 27 with the second rack 25, making the meshing of the second rack 25 and the jacking part more stable.

[0052] The other end of the sliding plate 27 is fixed with an end block 28 connected to the pull rope 18, and a second return spring 29 for resetting the second rack 25 is provided between the end block 28 and the inner cavity 21. It should be noted that during the downward pressing and flipping of the lower pressing triangular plate 4, the original pull rope 18 will be relatively pulled out of the inner cavity of the lower pressing triangular plate 4, that is, the pull rope 18 pulls the sliding plate 27 to move, and finally the second rack 25 is pulled. At the same time, due to the existence of the second return spring 29, when the lower pressing triangular plate 4 rotates and returns to its original position, the second return spring 29 will push the second rack 25 back to its initial position, ensuring that the thin metal plate 22 on the upper surface of the lower pressing triangular plate 4 returns to a flat state again.

[0053] The jacking part includes a fixed shaft 30 which is fixed inside the inner cavity 21. A second rotating gear 32 is coaxially sleeved on the fixed shaft 30, and the second rotating gear 32 is in meshing transmission with the second rack 25. Therefore, when the second rack 25 slides, it will drive the second rotating gear 32 on the fixed shaft 30 to rotate.

[0054] The jacking part further includes two elliptical plates 31 which are coaxially fixed on both sides of the second rotating gear 32. Therefore, after the second rotating gear 32 rotates, it will drive the two elliptical plates 31 on both sides to rotate together. It should be noted that the two elliptical plates 31 abut against the bottom of the lifting plate 24. When the fixed plate 23 and the lifting plate 24 are flush, the minor axes of the two elliptical plates 31 abut against the bottom of the lifting plate 24 on the side. When the second rack 25 slides to drive the second rotating gear 32 to rotate and drives the elliptical plates 31 to rotate, at this time, the elliptical plates 31 will push up the lifting plate, and then jack up the upper metal thin plate 22, causing the originally flat metal thin plate 22 to form wrinkles. This can better perform material discharging, enabling the material originally adhering to the metal thin plate 22 to form wrinkles and separate, avoiding the problem of pulling deformation due to adhesion, enabling the material to be quickly and conveniently discharged without damaging the originally printed material.

[0055] The working principle of the present invention is as follows:

[0056] First, a plurality of first return springs 17 act on the bottom of the pressing triangular plate 4 and push the pressing triangular plate 4 to be in a horizontal state, which can provide a stable platform for printing lighter materials. Then, the electric hydraulic cylinder 6 is started, which will push the first rack 7, causing the first rack 7 to be in meshing transmission with the first rotating gear 9, and then driving the rotating ring 8 to rotate. Therefore, it will drive the protruding plate 10 fixed to the bottom of the rotating ring 8 to rotate around the outer wall of the bottom base 5.

[0057] Then, a protruding plate 10 is fixed to the bottom of the rotating ring 8. During the rotation, both sides of the protruding plate 10 are arc-shaped edges, which can better squeeze the L-shaped plate 16 to descend, and drive the second connecting rod 15 to pull the sliding block 12 to move and descend, completing the rotation of the pressing triangular plate 4. When the protruding plate 10 squeezes past one of the L-shaped plates 16 and continues to squeeze towards the next L-shaped plate 16, the originally squeezed L-shaped plate 16 is reset under the action of the first return spring 17, and lifts the upper sliding block 12 together, and drives the pressing triangular plate 4 to flip upwards and re-abut against the bottom of the material. The L-shaped plate 16 adjacent to the L-shaped plate 16 after descending will be pressed down, thus realizing the sequential descent of the pressing triangular plates 4 in a circular pattern. By using the method of separating the base from the material base in batches, that is, dividing the original integral base into multiple parts, for these multiple parts, that is, multiple pressing triangular plates 4 descend in sequence, the base and the material base can be slowly peeled off in multiple areas. At the same time, the sequential and slow peeling can better avoid the problem of material deformation caused by manual clamping on the surface of the material.

[0058] Since the metal thin plate 22 is the top plate of the pressing triangular plate 4, the function of the metal thin plate 22 is not only to provide a stable placement platform for the material. Supported by the staggered rack, the metal thin plate 22 is lifted, so that the material placed on the metal thin plate 22 will not collapse. Secondly, with the movement of the staggered rack, the corresponding area of the metal thin plate 22 can be driven to vibrate, which can better separate the material base from the metal thin plate 22. The jacking part is located below the lifting plate 24, and the two elliptical plates 31 abut against the bottom of the lifting plate 24. When the fixed plate 23 and the lifting plate 24 are flush, the short axes of these two elliptical plates 31 abut against the bottom of the lifting plate 24 on the side. When the second rack 25 slides to drive the second rotating gear 32 to rotate and drives the elliptical plate 31 to rotate, the elliptical plate 31 at this time will push up the lifting plate, and then push up the upper metal thin plate 22, making the originally flat metal thin plate 22 wrinkle. In this way, better material removal can be achieved, and the material originally adhering to the metal thin plate 22 can wrinkle and separate, avoiding the problem of pulling deformation due to adhesion, and enabling the material to be quickly and conveniently removed. Among them, the fixed plate 23 and the lifting plate 24 are in a staggered state, so that the originally flat metal thin plate 22 is in a state of high and low stagger, and the material originally adhering to the surface of the metal thin plate 22 can be better removed.

[0059] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A platform material discharging structure for a 3D printer, comprising a printer body (1) and a bottom base (5) arranged at the bottom of the printer body (1), characterized in that, A horizontal plate (2) is horizontally arranged inside the printer body (1), and a polygonal hole (3) is formed in the horizontal plate (2). A plurality of downward pressing triangular plates (4) are circumferentially flipped in the polygonal hole (3), and printing materials are placed on the downward pressing triangular plates (4). A connecting part connected to the downward pressing triangular plates (4) one by one is circumferentially arranged on the bottom base (5). A plurality of deformation and material discharging parts for deforming the contact surface between the downward pressing triangular plate (4) and the material are arranged in the downward pressing triangular plate (4).

2. The platform stripping structure for a 3D printer according to claim 1, characterized in that, The downward pressing triangular plate (4) is an isosceles triangle, and a second rotating shaft (20) is fixed on one side of the bottom edge of the downward pressing triangular plate (4). The downward pressing triangular plate (4) rotates on the side wall of the polygonal hole (3) through a rotating groove (in19) and the second rotating shaft (20).

3. The platform material discharging structure for a 3D printer according to claim 1, characterized in that, The bottom base (5) is a cylindrical base, and downward pressing grooves (11) corresponding to the positions of the downward pressing triangular plates (4) one by one are circumferentially formed on the outer side wall. The connecting part slides up and down in the downward pressing groove (11), and the other end of the connecting part is connected to the bottom of the downward pressing triangular plate (4).

4. The platform material discharging structure for a 3D printer according to claim 3, characterized in that, The connecting part includes: A downward sliding block (12) that slides in the downward pressing groove (11). An L-shaped plate (16) is arranged below the downward sliding block (12), and the L-shaped plate (16) is connected to the downward sliding block (12) through a second connecting rod (15). A first connecting rod (13) whose two ends are rotatably connected to the downward sliding block (12) and the downward pressing triangular plate (4) through first rotating shafts (14).

5. The platform material discharging structure for a 3D printer according to claim 4, wherein, A rotating ring (8) rotates on the outer side wall of the bottom base (5), and a first rotating gear (9) is coaxially fixed on the outer side wall of the rotating ring (8). A protruding plate (10) is fixed at the bottom of the rotating ring (8). An electric hydraulic cylinder (6) is fixed on the inner wall of the printer body (1), and a first rack (7) meshing with the first rotating gear (9) is fixed at the output end of the electric hydraulic cylinder (6).

6. The platform material discharging structure for a 3D printer according to claim 5, characterized in that, The L-shaped plate (16) is located below the rotating ring (8). A bracket is fixed on the outer side wall of the bottom base (5), and a first return spring (17) is arranged between the L-shaped plate (16) and the bracket. The protruding plate (10) is located between two adjacent L-shaped plates (16).

7. A platform material discharging structure for a 3D printer according to claim 1, characterized in that, An inner cavity (21) is formed in the downward pressing triangular plate (4), and a pulling rope (18) extending into the inner cavity (in21) is fixed on the side wall of the polygonal hole (3). The pulling rope (18) extends into the inner cavity (21) through a pulling wire hole (33) formed in the side wall of the downward pressing triangular plate (4).

8. The platform material discharging structure for a 3D printer according to claim 7, characterized in that, The deformation and material discharging part includes: A thin metal plate (22) which is the top plate of the downward pressing triangular plate (4). A plurality of staggered brackets for horizontally supporting the thin metal plate (22) are arranged at the bottom of the thin metal plate (22), and the plurality of staggered brackets are linearly arranged in the inner cavity (21). A plurality of jacking parts are provided below the staggered rack, and a rack stabilizing frame (26) is arranged in the inner cavity (21). A sliding plate (27) slides on the rack stabilizing frame (26). One end of the sliding plate (27) is provided with a second rack (25) meshing with the jacking part. The other end of the sliding plate (27) is fixed with an end block (28) connected to the pulling rope (18). A second return spring (29) for resetting the second rack (25) is arranged between the end block (28) and the inner cavity (21).

9. The platform material discharging structure for a 3D printer according to claim 8, characterized in that, The staggered rack comprises a fixed plate (23) and a lifting plate (24). The fixed plate (23) is fixed in the inner cavity (21), and the lifting plate (24) moves up and down between two adjacent fixed plates (23). The jacking part is located below the lifting plate (24).

10. A platform material discharging structure for a 3D printer according to claim 8, characterized in that, The jacking part includes: A fixed shaft (30) which is fixed in the inner cavity of the inner cavity (21). A second rotating gear (32) is coaxially sleeved on the fixed shaft (30), and the second rotating gear (32) is in meshing transmission with the second rack (25); Two elliptical plates (31) which are coaxially fixed on both sides of the second rotating gear (32).

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