3D printing discharging mechanism

Abstract

The utility model provides a 3D printing discharge mechanism, which belongs to the technical field of 3D printing discharge, and comprises a feed bin, the bottom of the feed bin is communicated with a connecting pipe, one end of the connecting pipe far away from the feed bin is communicated with a heating chamber, the upper surface of the heating chamber is fixedly connected with a hydraulic pump, and the hydraulic pump is connected with a motor. The output end of the hydraulic pump is fixedly connected with a first hydraulic rod and a second hydraulic rod, the first hydraulic rod is fixedly connected with a pressing plate in the heating chamber, the second hydraulic rod is fixedly connected with a baffle in the heating chamber, and the lower surface of the heating chamber is communicated with a discharge port control assembly with a rectangular cross section. By means of the material extrusion device, the material extrusion speed is consistent, discharging is uniform, the size of a discharging port can be adjusted, the center position of the discharging port is kept constant, the printing accuracy is improved, the heating assembly does not make direct contact with materials, and the materials are prevented from being polluted.

Description

Technical Field

[0001] This utility model belongs to the field of 3D printing material output technology, and in particular relates to a 3D printing material output mechanism. Background Technology

[0002] 3D printing is an additive manufacturing technology that builds three-dimensional objects by stacking materials (such as plastics, metals, ceramics, etc.) layer by layer. Its core advantages include no need for molds, support for complex structural designs, and high material utilization. It is widely used in aerospace, medical, automotive, construction and other fields. The material output mechanism is the core component of a 3D printer, responsible for the precise delivery and extrusion of materials, which directly affects the printing quality and efficiency.

[0003] In existing technologies, 3D printing material output mechanisms mainly include a hopper, a connecting pipe, a discharge port, and a heating chamber. The printing material in the hopper is transported to the heating chamber through the connecting pipe to melt, and then discharged from the discharge port. When printing large objects, the material in the heating chamber is increased to achieve long-term continuous printing.

[0004] When the amount of material increases, the heating plate can easily cause uneven heating of the material, local high temperature can damage the material, the material viscosity is too high leading to uneven discharge, and the discharge port is prone to blockage. Utility Model Content

[0005] The purpose of this utility model is to solve the problems mentioned in the background art of the prior art, and to propose a 3D printing material output mechanism.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A 3D printing material output mechanism includes a feeding bin, a connecting pipe connected to the bottom of the feeding bin, a heating chamber connected to the end of the connecting pipe away from the feeding bin, a hydraulic pump fixedly connected to the upper surface of the heating chamber, a first hydraulic rod and a second hydraulic rod fixedly connected to the output end of the hydraulic pump, the ends of the first hydraulic rod and the second hydraulic rod away from the hydraulic pump penetrating the upper surface of the heating chamber and extending into the heating chamber, a pressure plate fixedly connected to the first hydraulic rod in the heating chamber, a baffle fixedly connected to the second hydraulic rod in the heating chamber, a discharge port control component with a rectangular cross-section connected to the lower surface of the heating chamber, and a hollow jacket on the side wall of the heating chamber.

[0008] The discharge port control assembly includes a cylindrical top cover. A first rotating shaft is fixedly connected to the side wall of the top cover. A first driven gear is rotatably connected to the first rotating shaft. A drive motor is fixedly connected to the side wall of the top cover. A drive gear is fixedly connected to the output shaft of the drive motor. The drive gear meshes with the first driven gear. The top cover is rotatably connected to a second driven gear. The first driven gear meshes with the second driven gear. The top cover is fixedly connected to four second rotating shafts. Each second rotating shaft is rotatably connected to a third driven gear. The bottom surface of the top cover has four sliding grooves. The sliding grooves are slidably connected to four rack and pinion sliders through limiting blocks. The four rack and pinion sliders mesh with the third driven gears.

[0009] Preferably, the pressure plate has an annular step, and the outer diameter of the baffle is in clearance fit with the inner diameter of the annular step.

[0010] Preferably, the hollow jacket is a double-layer cavity structure located between the outer wall and the inner wall of the heating element.

[0011] Preferably, the lower part of the outer wall of the heating chamber has an oil inlet that is connected and communicates with the hollow jacket, and the upper part of the outer wall of the heating chamber has an oil return port that is connected and communicates with the hollow jacket.

[0012] Preferably, the upper cover has a square hole, the size of which is consistent with the size of the discharge port when the rack slider moves along the slide groove to its limit position.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] 1. This utility model is equipped with a material extrusion device, which makes the material extrusion speed consistent and uniform, and avoids the problem of residual material in the heating chamber after printing due to the high viscosity of the material.

[0015] 2. This utility model uses a gear set to link a rack and pinion slider to adjust the opening and closing range of the discharge port. At the same time, the limiting block and the slide groove cooperate to ensure that the center position of the discharge port is constant. The size of the discharge port can be adjusted and the center position of the discharge port remains constant, thus improving printing accuracy.

[0016] 3. The hollow jacket of this utility model achieves uniform heating through circulating hot oil, avoiding localized temperature accumulation caused by direct contact, resulting in uniform heating and stable temperature changes. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a 3D printing material output mechanism proposed in this utility model;

[0018] Figure 2 This is a front sectional view of a 3D printing material output mechanism proposed in this utility model;

[0019] Figure 3This is a schematic diagram of the internal gear set structure of the discharge port control component of a 3D printing discharge mechanism proposed in this utility model.

[0020] Figure 4 This is a bottom view of the discharge port control component of a 3D printing discharge mechanism proposed in this utility model;

[0021] Figure 5 This is a top view of the discharge port control component of a 3D printing discharge mechanism proposed in this utility model;

[0022] Figure 6 This is a schematic diagram of the motion state of the discharge port control component of a 3D printing discharge mechanism proposed in this utility model.

[0023] In the diagram: 1. Feed hopper; 2. Connecting pipe; 3. Heating chamber; 4. Hydraulic pump; 5. First hydraulic rod; 6. Second hydraulic rod; 7. Pressure plate; 8. Baffle; 9. Discharge port control assembly; 10. Hollow jacket; 11. Drive motor; 12. Drive gear; 13. First driven gear; 14. Second driven gear; 15. Third driven gear; 16. Rack and pinion slider; 17. Limiting block; 18. Slide groove; 19. Annular step; 20. Oil inlet; 21. Oil return port; 22. First rotating shaft; 23. Second rotating shaft; 24. Top cover. Detailed Implementation

[0024] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0025] Reference Figures 1-6 A 3D printing material output mechanism includes a feeding bin 1, with a connecting pipe 2 connected to the bottom of the feeding bin 1. The end of the connecting pipe 2 away from the feeding bin 1 is connected to a heating chamber 3. A hydraulic pump 4 is fixedly connected to the upper surface of the heating chamber 3. A first hydraulic rod 5 and a second hydraulic rod 6 are fixedly connected to the output end of the hydraulic pump 4. The ends of the first hydraulic rod 5 and the second hydraulic rod 6 away from the hydraulic pump 4 penetrate the upper surface of the heating chamber 3 and extend into the heating chamber 3. A pressure plate 7 is fixedly connected to the first hydraulic rod 5 inside the heating chamber 3. The second hydraulic rod 6... A baffle 8 is fixedly connected inside the heating chamber 3. The pressure plate 7 is provided with an annular step 19. The outer diameter of the baffle 8 and the inner diameter of the annular step 19 are in clearance fit. A discharge port control component 9 with a rectangular cross-section is connected and communicated to the lower surface of the heating chamber 3. A hollow jacket 10 is provided on the side wall of the heating chamber 3. The hollow jacket 10 is a double-layer cavity structure located between the outer wall and the inner wall of the heating chamber 3. There is an oil inlet 20 connected and communicated with the hollow jacket 10 below the outer wall of the heating chamber 3. There is an oil return port 21 connected and communicated with the hollow jacket 10 above the outer wall of the heating chamber 3.

[0026] The discharge port control assembly 9 includes a cylindrical top cover 24. A first rotating shaft 22 is fixedly connected to the side wall of the top cover 24. A first driven gear 13 is rotatably connected to the first rotating shaft 22. A drive motor 11 is fixedly connected to the side wall of the top cover. A drive gear 12 is fixedly connected to the output shaft of the drive motor 11. The drive gear 12 meshes with the first driven gear 13. The top cover 24 is rotatably connected to a second driven gear 14. The first driven gear 13 meshes with the second driven gear 14. The top cover 24 is fixedly connected to four second rotating shafts 23. Each second rotating shaft 23 is rotatably connected to a third driven gear 15. The bottom surface of the top cover 24 has four sliding grooves 18. The sliding grooves 18 are slidably connected to four rack and pinion sliders 16 through a limiting block 17. The four rack and pinion sliders 16 mesh with the third driven gears 15. The top cover 24 has a square hole. The size of the square hole is consistent with the discharge port size when the rack and pinion sliders 16 move to the limit position along the sliding groove 18.

[0027] In practice, material is added to the feeding hopper 1, and the hydraulic pump 4 is started, causing the second hydraulic rod 6 to move downward, which in turn moves the baffle 8 downward, thus connecting the feeding hopper 1 with the heating chamber 3. The material enters the heating chamber 3, and then the second hydraulic rod 6 moves the baffle 8 upward, closing the feeding channel. The external circulating heating oil pump is then turned on. The external circulating heating oil pump is connected to the oil inlet 20 and the oil return port 21 through pipelines. The circulating heating oil pump uses existing technology (not shown in the figure), allowing heating oil to enter from the oil inlet 20 and flow out from the oil return port 21. After the material in the heating chamber 3 is heated to the required temperature, the drive motor is started. 11. The drive gear 12 moves, which in turn drives the first driven gear 13 meshing with it. The first driven gear 13 moves, which drives the second driven gear 14. The second driven gear 14 moves, which drives the third driven gear 15. The third driven gear 15 moves, which drives the rack and pinion slider 16 to move in the slide groove 18, thereby opening the discharge port. Then, the first hydraulic rod 5 and the second hydraulic rod 6 move downward synchronously, which drives the pressure plate 7 and the baffle 8 to move downward, squeezing the material in the heating chamber 3 and scraping off the material on the inner wall of the heating chamber 3, so that the material is evenly discharged from the discharge port until it is completely discharged.

[0028] The functional principle of this utility model can be explained through the following operation methods:

[0029] When printing large objects, material is added to the feeding hopper 1, and the hydraulic pump 4 is started, causing the second hydraulic rod 6 to move downward, which in turn moves the baffle 8 downward, thus connecting the feeding hopper 1 with the heating chamber 3. The material enters the heating chamber 3, and then the second hydraulic rod 6 moves the baffle 8 upward, closing the feeding channel and turning on the external circulating heating oil pump. The external circulating heating oil pump is connected to the oil inlet 20 and the oil return port 21 through pipelines. The circulating heating oil pump adopts existing technology (not shown in the figure), so that the heating oil enters from the oil inlet 20 and flows out from the oil return port 21. The hot oil circulates in the hollow jacket 10, and the material in the heating chamber 3 is heated evenly through heat conduction, avoiding local overheating that could lead to carbonization of the material. The heating components do not directly contact the material, and the heating is uniform and the temperature change is stable. After the material in the heating chamber 3 is heated to the required temperature, the drive motor 11 is run, which drives the drive gear 12 to move, thereby driving the first driven gear 13 meshing with it to move. Driven gear 13 moves, driving second driven gear 14, which in turn drives third driven gear 15. Third driven gear 15 then drives rack and pinion slider 16 to move in groove 18, thus opening the discharge port. Driven motor 11 drives gear set to move, and gear set linkage with rack and pinion slider 16 adjusts the opening and closing range of the discharge port. At the same time, limit block 17 cooperates with groove 18 to ensure that the center position of the discharge port is constant. The size of the discharge port is adjustable and the center position of the discharge port remains constant, improving printing accuracy. Subsequently, first hydraulic rod 5 and second hydraulic rod 6 move downward synchronously, driving pressure plate 7 and baffle 8 to move downward, squeezing the material in heating chamber 3 and scraping off the material on the inner wall of heating chamber 3, so that the material is evenly discharged from the discharge port until it is completely discharged. Hydraulic pump 4 controls hydraulic rods to generate constant downward pressure, which can make the material evenly extruded, while avoiding the problem of the material sticking to the inner wall of heating chamber 3 due to high viscosity and being difficult to clean.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A 3D printing material output mechanism, characterized in that, Includes a feeding hopper (1), the bottom of which is connected to a connecting pipe (2), the end of which is away from the feeding hopper (1) is connected to a heating chamber (3), a hydraulic pump (4) is fixedly connected to the upper surface of the heating chamber (3), a first hydraulic rod (5) and a second hydraulic rod (6) are fixedly connected to the output end of the hydraulic pump (4), the ends of the first hydraulic rod (5) and the second hydraulic rod (6) away from the hydraulic pump (4) penetrate the upper surface of the heating chamber (3) and extend into the heating chamber (3), a pressure plate (7) is fixedly connected to the first hydraulic rod (5) in the heating chamber (3), a baffle (8) is fixedly connected to the second hydraulic rod (6) in the heating chamber (3), a discharge port control component (9) with a rectangular cross-section is connected to the lower surface of the heating chamber (3), and a hollow jacket (10) is provided on the side wall of the heating chamber (3); The discharge port control assembly (9) includes a cylindrical top cover (24). A first rotating shaft (22) is fixedly connected to the side wall of the top cover (24). A first driven gear (13) is rotatably connected to the first rotating shaft (22). A drive motor (11) is fixedly connected to the side wall of the top cover. A drive gear (12) is fixedly connected to the output shaft of the drive motor (11). The drive gear (12) meshes with the first driven gear (13). The top cover (24) is rotatably connected to a second driven gear. Gear (14), the first driven gear (13) meshes with the second driven gear (14), the upper cover (24) is fixedly connected to four second rotating shafts (23), each of the second rotating shafts (23) is rotatably connected to a third driven gear (15), the bottom surface of the upper cover (24) has four sliding grooves (18), the sliding grooves (18) are slidably connected to four rack sliders (16) through a limiting block (17), and the four rack sliders (16) mesh with the third driven gear (15).

2. The 3D printing material output mechanism according to claim 1, characterized in that, The pressure plate (7) is provided with an annular step (19), and the outer diameter of the baffle (8) is in clearance fit with the inner diameter of the annular step (19).

3. The 3D printing material output mechanism according to claim 1, characterized in that, The hollow jacket (10) is a double-layer cavity structure located between the outer wall and the inner wall of the heating chamber (3).

4. The 3D printing material output mechanism according to claim 1, characterized in that, The heating chamber (3) has an oil inlet (20) connected to the hollow jacket (10) at the bottom of its outer wall, and an oil return port (21) connected to the hollow jacket (10) at the top of its outer wall.

5. A 3D printing material output mechanism according to claim 1, characterized in that, The upper cover (24) has a square hole, the size of which is consistent with the size of the discharge port when the rack slider (16) moves along the slide groove (18) to its limit position.

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