3D printing nozzle anti-blocking device

Abstract

The utility model discloses a 3D printing nozzle anti-blocking device which comprises a hollow nozzle body, a top plate is arranged at the upper end of the nozzle body, a feeding port is formed in the middle of the nozzle body, a discharging port is formed in the lower end of the nozzle body, a conical block is arranged in the nozzle body in a sliding mode, a protection pipe is arranged at the upper end of the conical block, a vertical groove is formed in the upper end face of the conical block, and a through hole is formed in the bottom of the vertical groove. A vertically sliding lead screw and a driving mechanism are arranged on the top plate, the bottom end of the lead screw is arranged in the vertical groove and provided with a limiting plate, an annular cover plate is arranged at an opening of the vertical groove, a spring is arranged between the bottom of the vertical groove and the bottom of the limiting plate, a push needle is arranged at the bottom of the limiting plate, and an anti-rotation mechanism is arranged on the lead screw. Through the combined action of the driving mechanism and the anti-rotation mechanism, the driving lead screw drives the conical block and the protection pipe to move up and down, a solution in the spray head body is extruded out of the discharging opening, and in the movement process of the conical block, the protection pipe can block the feeding opening, so that the solution in the feeding opening cannot enter the mechanism to affect operation.

Description

Technical Field

[0001] This utility model relates to the field of 3D printing technology, and in particular to a 3D printing nozzle anti-clogging device. Background Technology

[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 a basis and employs adhesive materials such as metal or plastic to construct objects by printing layer by layer.

[0003] As 3D printing technology matures, it is being applied to various industries. When 3D printing with molten metal, the high-temperature molten metal is ejected through the nozzle for printing. After printing, a certain amount of molten metal remains in the nozzle. As the temperature of the molten metal drops, it solidifies into a block, causing the nozzle to become clogged. When the nozzle is used again, it needs to be heated for a long time to melt the metal before it can be used again, which not only reduces printing efficiency but also increases energy consumption. Chinese utility model patent CN210706080U discloses a 3D printer anti-clogging nozzle, which includes a hollow nozzle body. The nozzle body has two adjacent pistons, a and b, with a gap between them. The bottom of piston b is conical, the same shape as the bottom of the nozzle body. A push rod is provided at the center of the bottom of piston a. The push rod is inserted downward into a through hole opened at the axis of piston b. The nozzle body is provided with a drive mechanism that can drive piston a to move up and down. The drive mechanism pushes piston a to drive piston b to descend and push out the solution in the nozzle body. As piston a continues to descend, it drives the push rod through piston b to push out the residual solution in the outlet.

[0004] Regarding the aforementioned technologies, the inventors believe that the following defects exist: In the above-mentioned solution, there is a gap between piston a and piston b. When piston a and piston b descend through the feed hole, the residual solution in the feed hole will enter the gap between piston a and piston b, which will cause some inconvenience and impact on subsequent cleaning work. Utility Model Content

[0005] To address the aforementioned problems, this invention provides a 3D printing nozzle anti-clogging device to solve the issues raised in the background section.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a 3D printing nozzle anti-clogging device, comprising a hollow nozzle body, a top plate provided at the upper end of the nozzle body, a feed inlet provided on the middle side wall of the nozzle body, a tapered lower end of the nozzle body with a discharge outlet, a tapered block slidably disposed within the nozzle body and engaging with the lower end of the nozzle body, a protective tube extending upward along the outer edge of the upper end of the tapered block, and a vertical groove formed on the upper surface of the tapered block. The bottom of the vertical groove has a through hole arranged concentrically with the discharge port. The top plate is provided with a vertically sliding lead screw and a drive mechanism for driving the lead screw. The bottom end of the lead screw is placed in the vertical groove and is provided with a limiting plate with a diameter larger than the diameter of the lead screw. The opening of the vertical groove is provided with an annular cover plate with an inner wall diameter consistent with the diameter of the lead screw. A spring is provided between the bottom of the vertical groove and the bottom of the limiting plate. The bottom of the limiting plate is also provided with a push pin extending into the through hole. The lead screw is provided with an anti-rotation mechanism.

[0007] By adopting the above technical solution, a conical block, protective tube, lead screw, drive mechanism, limit plate, annular cover plate, push needle, and anti-rotation mechanism are set up. Through the joint action of the drive mechanism and the anti-rotation mechanism, the drive lead screw moves up and down, causing the conical block and protective tube to move up and down, thereby squeezing the solution in the nozzle body from the outlet. After the conical block contacts the bottom of the nozzle body, the lead screw continues to move downward, causing the spring to be compressed. The push needle moves downward until it reaches the bottom of the outlet, squeezing out the solution in the outlet. During the movement of the conical block, the protective tube blocks the inlet, preventing the solution in the inlet from entering the upper part of the conical block and protective tube. Only the solution below the conical block needs to be cleaned, which is simple and convenient.

[0008] Furthermore, the drive mechanism includes a drive motor mounted on the top plate, the output axis of the drive motor is downward and the end is provided with a drive wheel, and a nut that is helically engaged with a lead screw is rotatably mounted on the top plate, and the outer periphery of the nut is provided with several teeth that mesh with the drive wheel.

[0009] By adopting the above technical solution, a drive motor, a drive wheel, and a nut are set up. The drive motor drives the drive wheel to rotate, which in turn drives the nut to rotate, thereby causing the lead screw to move.

[0010] Furthermore, the anti-rotation mechanism includes a vertical groove formed in the inner wall of the nozzle body, and a limiting rod is provided on the middle part of the lead screw, with the end of the limiting rod away from the lead screw slidably disposed in the vertical groove.

[0011] By adopting the above technical solution, a vertical groove and a limiting rod are placed to limit the axial direction of the lead screw, making it impossible for the lead screw to rotate.

[0012] Furthermore, an annular groove is provided at the lower part of the protective tube, and a sealing ring is provided in the annular groove.

[0013] By adopting the above technical solution, an annular groove and a sealing ring are set up. The sealing ring seals the outer wall of the protective tube and the inner wall of the nozzle body, preventing the solution from seeping into the gap between the outer wall of the protective tube and the inner wall of the nozzle body when the conical block squeezes out the solution inside the nozzle body.

[0014] Furthermore, in the initial state, the lower end of the pusher is higher than the lower end of the cone block.

[0015] By adopting the above technical solution, the lower end of the pusher is set higher than the lower end of the cone block. When the lead screw pushes the cone block down, the cone block will encounter a certain resistance when squeezing the solution. The spring will be partially compressed, and the pusher will move down a little, but it will not move out of the lower end of the cone block.

[0016] Furthermore, the lower end of the pusher is tapered.

[0017] By adopting the above technical solution, the lower end of the pusher is set into a cone shape, which facilitates the cleaning of the solution in the outlet.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: In this application, a conical block, a protective tube, a lead screw, a drive mechanism, a limiting plate, an annular cover plate, a push needle, and an anti-rotation mechanism are provided. Through the joint action of the drive mechanism and the anti-rotation mechanism, the drive lead screw moves up and down, causing the conical block and the protective tube to move up and down, thereby squeezing the solution in the nozzle body from the outlet. After the conical block contacts the bottom of the nozzle body, the lead screw continues to move downward, causing the spring to be compressed, and the push needle moves downward until it reaches the bottom of the outlet, squeezing the solution in the outlet. During the movement of the conical block, the protective tube will block the inlet, so that the solution in the inlet will not enter the upper side of the conical block and the protective tube. Only the solution below the conical block needs to be cleaned, which is simple and convenient. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0020] Figure 2 This is a cross-sectional schematic diagram of the initial state of an embodiment of the present invention;

[0021] Figure 3 This is a cross-sectional schematic diagram of the cleaning process in an embodiment of this utility model;

[0022] Figure 4 This is a cross-sectional view of the completed cleaning process according to an embodiment of this utility model.

[0023] In the diagram: 10. Nozzle body; 11. Top plate; 12. Inlet; 13. Outlet; 20. Conical block; 21. Protective tube; 22. Vertical groove; 23. Through hole; 24. Annular cover plate; 25. Spring; 30. Lead screw; 31. Limiting plate; 32. Push needle; 40. Drive mechanism; 41. Drive motor; 42. Drive wheel; 43. Nut; 44. Annular groove; 45. Sealing ring; 50. Anti-rotation mechanism; 51. Vertical groove; 52. Limiting rod. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Please see Figure 1-4 This invention provides a technical solution: a 3D printing nozzle anti-clogging device, comprising a hollow nozzle body 10, a top plate 11 at the upper end of the nozzle body 10, a feed inlet 12 on the middle side wall of the nozzle body 10, and a tapered discharge outlet 13 at the lower end of the nozzle body 10. The solution enters the nozzle through the feed inlet 12 and exits through the discharge outlet 13, which is a straight hole used to stabilize the flow rate and extrusion width of the solution before extrusion. A tapered block 20, which slidably engages with the lower end of the nozzle body 10, is slidably disposed within the nozzle body 10 to extrude any residual solution after 3D printing, preventing the solution from solidifying into blocks after the temperature drops, thus avoiding nozzle clogging. A protective tube 21 is provided extending upward along the outer edge of the upper end of the conical block 20. During the movement of the conical block 20, the protective tube 21 will block the feed inlet 12, so that the solution in the feed inlet 12 will not enter the upper side of the conical block 20 and the protective tube 21. Only the solution below the conical block 20 needs to be cleaned, which is simple and convenient.

[0027] Specifically, a vertical groove 22 is provided on the upper surface of the conical block 20, and a through hole 23 arranged concentrically with the discharge port 13 is provided at the bottom of the vertical groove 22. A vertically sliding lead screw 30 is provided on the top plate 11. The bottom end of the lead screw 30 is placed in the vertical groove 22 and a limiting plate 31 is provided. The diameter of the limiting plate 31 is larger than the diameter of the lead screw 30. An annular cover plate 24 is provided at the opening of the vertical groove 22. The inner diameter of the annular cover plate 24 is the same as the diameter of the lead screw 30, and the outer diameter is the same as the diameter of the protective tube 21. A spring 25 is provided between the bottom of the vertical groove 22 and the bottom of the limiting plate 31. A push needle 32 extending into the through hole 23 is also provided at the bottom of the limiting plate 31. The lower end of the push needle 32 is conical to facilitate cleaning of the solution in the discharge port 13. In the initial state, the lower end of the pusher 32 is higher than the lower end of the cone block 20. During the process of the screw 30 pushing the cone block 20 down, the cone block 20 will encounter a certain resistance when squeezing the solution. The spring 25 will be partially compressed, and the pusher 32 will move down a little, but will not move out of the lower end of the cone block 20.

[0028] The lead screw 30 is provided with an anti-rotation mechanism 50. The anti-rotation mechanism 50 includes a vertical groove 51 formed in the inner wall of the nozzle body 10. Specifically, the vertical groove 51 extends from the upper part to the middle part of the nozzle body 10. A limit rod 52 is provided on the middle part of the lead screw 30. The end of the limit rod 52 away from the lead screw 30 is slidably disposed in the vertical groove 51 to limit the axial direction of the lead screw 30, so that the lead screw 30 cannot rotate.

[0029] A drive mechanism 40 for driving the lead screw 30 is provided on the top plate 11. The drive mechanism 40 includes a drive motor 41 mounted on the top plate 11. The output shaft of the drive motor 41 is downward and a drive wheel 42 is provided at its end. A nut 43 is rotatably mounted on the top plate 11 and is helically engaged with the lead screw 30. Several teeth are provided on the outer circumference of the nut 43 and mesh with the drive wheel 42. The drive motor 41 drives the drive wheel 42 to rotate, which in turn drives the nut 43 to rotate, causing the lead screw 30 to move up and down. When the lead screw 30 rises, the limiting plate 31 contacts the annular cover plate 24, pulling the conical block 20 and the protective tube 21 upward.

[0030] An annular groove 44 is provided at the lower part of the protective tube 21, and a sealing ring 45 is provided in the annular groove 44. The sealing ring 45 is located below the vertical groove 51. On the one hand, it prevents the solution from flowing from the vertical groove 51 to the top of the protective tube 21 and cannot be cleaned. On the other hand, it prevents the solution from seeping into the gap between the outer wall of the protective tube 21 and the inner wall of the nozzle body 10 when the cone block 20 squeezes out the solution in the nozzle body 10, which would cause the protective tube 21 and the nozzle body 10 to stick together after cooling.

[0031] The working principle of the 3D printing nozzle anti-clogging device in this embodiment is as follows: After 3D printing is completed, the drive motor 41 is started to drive the drive wheel 42 to rotate, which drives the nut 43 to rotate. At this time, under the limit action, the lead screw 30 moves downward, driving the conical block 20 and the protective tube 21 to move downward until the conical block 20 contacts the bottom of the nozzle body 10. The conical block 20 can no longer descend. At this time, the lead screw 30 continues to descend, causing the spring 25 to compress and push out the pusher 32, so that the solution in the nozzle body 10 and the outlet 13 is completely pushed out, completing the cleaning. After the cleaning is completed, the drive motor 41 drives the lead screw 30 to rise, the spring 25 is pulled open, and the pusher 32 moves upward to the initial position. At this time, the limit plate 31 contacts the annular cover plate 24, and the lead screw 30 continues to rise, pulling the conical block 20 and the protective tube 21 upward. The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A 3D printing nozzle anti-clogging device, comprising a hollow nozzle body (10), wherein a top plate (11) is provided at the upper end of the nozzle body (10), a feed inlet (12) is provided on the middle side wall of the nozzle body (10), and the lower end of the nozzle body (10) is conical and provided with a discharge outlet (13), characterized in that: A conical block (20) that slidably engages with the lower end of the nozzle body (10) is slidably disposed inside the nozzle body (10). A protective tube (21) extends upward along the outer edge of the upper end of the conical block (20). A vertical groove (22) is formed on the upper surface of the conical block (20). A through hole (23) arranged concentrically with the discharge port (13) is formed at the bottom of the vertical groove (22). A vertically sliding lead screw (30) and a drive mechanism (40) for driving the lead screw (30) are provided on the top plate (11). The bottom end of the rod (30) is placed in a vertical groove (22) and a limiting plate (31) with a diameter larger than that of the lead screw (30) is provided. The groove opening of the vertical groove (22) is provided with an annular cover plate (24) with an inner wall diameter consistent with that of the lead screw (30). A spring (25) is provided between the bottom of the vertical groove (22) and the bottom of the limiting plate (31). The bottom of the limiting plate (31) is also provided with a push pin (32) extending into the through hole (23). An anti-rotation mechanism (50) is provided on the lead screw (30).

2. The 3D printing nozzle anti-clogging device according to claim 1, characterized in that: The drive mechanism (40) includes a drive motor (41) mounted on a top plate (11). The output axis of the drive motor (41) is downward and a drive wheel (42) is provided at its end. A nut (43) that is helically engaged with a lead screw (30) is rotatably mounted on the top plate (11). The nut (43) has several teeth on its outer periphery that mesh with the drive wheel (42).

3. The 3D printing nozzle anti-clogging device according to claim 1, characterized in that: The anti-rotation mechanism (50) includes a vertical groove (51) formed on the inner wall of the nozzle body (10), and a limiting rod (52) is provided on the middle part of the screw (30). The end of the limiting rod (52) away from the screw (30) is slidably disposed in the vertical groove (51).

4. The 3D printing nozzle anti-clogging device according to claim 1, characterized in that: The lower part of the protective tube (21) is provided with an annular groove (44), and a sealing ring (45) is provided in the annular groove (44).

5. A 3D printing nozzle anti-clogging device according to claim 1, characterized in that: In the initial state, the lower end of the pusher (32) is higher than the lower end of the cone block (20).

6. The 3D printing nozzle anti-clogging device according to claim 1, characterized in that: The lower end of the pusher (32) is tapered.

Images