3D printing material extrusion pressure adjusting structure

Abstract

The utility model discloses a 3D printing material extrusion pressure adjusting structure relates to 3D printing technical field, specifically a kind of 3D printing material extrusion pressure adjusting structure, including shell, glue inlet pipe, glue outlet pipe, the shell is fixedly connected with glue inlet pipe, the outer surface of glue inlet pipe is fixedly connected with glue outlet pipe, be equipped with first through-hole in glue inlet pipe, be equipped with second through-hole in glue outlet pipe, first through-hole and second through-hole intercommunicate, the axis of shell is equipped with mechanical needle, the end of mechanical needle is coniform, mechanical needle coniform end passes through glue inlet pipe until glue outlet pipe inside, second through-hole and mechanical needle outer shape maximum diameter match, the clearance of colloid extrusion is adjusted by the coniform of mechanical needle end and second through-hole match, gap big pressure small, gap small big force big, glue outlet pipe is threadedly connected with spray head, and spray head end is equipped with recess, recess inside is hinged with nozzle adjusting plate, the diameter size of nozzle is adjusted by nozzle adjusting plate, extrusion pressure is adjusted by size.

Description

Technical Field

[0001] This utility model relates to the field of grass cultivation technology, specifically a 3D printing material extrusion pressure adjustment structure. Background Technology

[0002] With the continuous innovation and development of scientific research and technology, 3D printing technology has also been quietly developed. At present, the demand for multi-material printing, high-performance composite materials and complex structure manufacturing is increasing, and the research on extrusion pressure regulation technology is becoming more and more in-depth. In particular, the extrusion pressure regulation structure of 3D printing materials is one of the key technologies affecting printing quality, accuracy and material adaptability. Extrusion pressure directly affects the flow behavior of molten material, interlayer bonding strength and mechanical properties of the final part. Insufficient pressure will lead to uneven extrusion, filament breakage, porosity and other problems; excessive pressure may cause material degradation, nozzle blockage or deformation of the printing platform. Different materials (such as thermoplastics, ceramic slurries and energetic materials) have significantly different requirements for extrusion pressure, which need to be dynamically adjusted to adapt to different working conditions. For this reason, we propose a 3D printing material extrusion pressure regulation structure. Utility Model Content

[0003] This invention provides a 3D printing material extrusion pressure adjustment structure, which solves the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A 3D printing material extrusion pressure adjustment structure includes a housing, an inlet tube, and an outlet tube. The end of the housing is fixedly connected to the upper half of the inlet tube. The outlet tube is fixedly connected to the outer surface of the inlet tube. The inlet tube has a first through hole, and the outlet tube has a second through hole. The first through hole and the second through hole are interconnected. A mechanical needle is disposed at the axis of the housing, and the end of the mechanical needle is conical. The conical end of the mechanical needle passes through the inlet tube and extends into the outlet tube. The second through hole matches the maximum diameter of the mechanical needle. The mechanical needle is slidably connected to the housing, the inlet tube, and the outlet tube. A nozzle is threadedly connected to the outer surface of the outlet tube, and the end of the nozzle has a groove. An array of nozzle adjustment plates is disposed inside the groove. The end of the nozzle adjustment plate is hinged to the nozzle, and the nozzle adjustment plates can be converged or dispersed.

[0006] Preferably, a pressure chamber is provided at the center where the housing intersects with the glue inlet pipe, and the pressure chamber is interconnected with the first through hole and the second through hole.

[0007] Preferably, a second spring is fixedly connected to the other end of the nozzle adjusting plate, and the other end of the second spring is fixedly connected to the inner wall of the nozzle groove portion. A bolt is provided on one side of the second spring, and the bolt passes through the inner wall of the nozzle groove portion and contacts the nozzle adjusting plate. The bolt is threadedly connected to the nozzle, and the bolt can adjust and fix the angle of the nozzle adjusting plate.

[0008] Preferably, a support block is installed inside the housing, and the mechanical needle passes through the axial center of the support block and is slidably connected to the support block.

[0009] Preferably, a first fixing ring is provided on the right side of the support block, and the first fixing ring is fixedly connected to the mechanical needle; a second fixing ring is fixedly connected to the inner side of the right end of the housing, and a first spring is provided between the second fixing ring and the first fixing ring.

[0010] Preferably, the left end of the housing is threaded with a threaded cap, and the inner sidewall of the threaded cap is rotatably connected to the left end of the mechanical needle.

[0011] This utility model has the following beneficial effects:

[0012] 1. The extrusion pressure adjustment structure of this 3D printing material adjusts the extrusion pressure by matching the conical tip of the mechanical needle with the through hole inside the dispensing tube. After the conical tip enters the through hole, the cone is smaller at the front and larger at the back. The deeper the cone goes into the through hole inside the dispensing tube, the smaller the gap through which the colloid can be extruded, and the greater the extrusion pressure. Conversely, the deeper the cone goes into the through hole, the larger the gap through which the colloid can be extruded, and the lower the extrusion pressure. The extrusion pressure is adjusted by adjusting the depth of the mechanical needle in the through hole inside the dispensing tube, thereby adapting to the extrusion pressure requirements of different materials. At the same time, the cooperation between the mechanical needle and the through hole ensures uniform extrusion pressure and reduces problems such as filament breakage and porosity.

[0013] 2. This 3D printing material extrusion pressure adjustment structure uses multiple nozzle adjustment plates spliced ​​together to form a complete nozzle, with the nozzle end hinged to the nozzle head. This allows the nozzle to be adjusted up and down to change its angle, thus adapting to the extrusion pressure requirements of different materials. Furthermore, this structure makes subsequent maintenance easier, eliminating the need to replace the entire nozzle head. The mechanical needle adjustment and nozzle adjustment plates work together to achieve more stable extrusion pressure, resulting in higher extrusion precision and higher quality extruded material. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the nozzle structure of this utility model;

[0016] Figure 3This is a schematic diagram of the pressure regulating gun structure of this utility model;

[0017] In the diagram: 1. Housing; 2. Mechanical needle; 3. First retaining ring; 4. Threaded cap; 5. Inlet tube; 6. Outlet tube; 7. First spring; 8. Second retaining ring; 9. Pressure chamber; 10. Nozzle; 11. Bolt; 12. Nozzle adjusting plate; 13. Second spring; 14. Support block. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figures 1 to 3 To achieve convenient operation, higher pressure adjustment accuracy, higher extrusion quality, and time saving, this application provides a 3D printing material extrusion pressure adjustment structure. This structure includes a housing 1, an inlet tube 5, and an outlet tube 6. The end of the housing 1 is fixedly connected to the upper half of the inlet tube 5. The outlet tube 6 is fixedly connected to the outer surface of the inlet tube 5, and a first through hole is formed inside the inlet tube 5. A second through hole is formed inside the outlet tube 6, and the first and second through holes communicate with each other. A mechanical needle 2 is provided at the axis, and the end of the mechanical needle 2 is conical. The conical end of the mechanical needle 2 passes through the glue inlet tube 5 and extends into the glue outlet tube 6. The second through hole matches the maximum diameter of the mechanical needle 2. The mechanical needle 2 is slidably connected to the housing 1, the glue inlet tube 5, and the glue outlet tube 6. A nozzle 10 is threadedly connected to the outer surface of the glue outlet tube 6, and a groove is provided at the end of the nozzle 10. An array of nozzle adjustment plates 12 is provided inside the groove. The end of the nozzle adjustment plate 12 is hinged to the nozzle 10, and the nozzle adjustment plate 12 can be brought together or dispersed.

[0020] Based on the above, when the conical mechanical needle 2 penetrates the tube 6, the gap between it and the second through hole decreases, and the material flow cross-sectional area shrinks. According to fluid mechanics, the decrease in flow area leads to an increase in extrusion pressure. Conversely, when the mechanical needle 2 moves outward, the gap increases and the pressure decreases. Multiple nozzle adjustment plates 12 are hinged to form a variable aperture. When they converge, the aperture shrinks and the pressure increases. When they disperse, the aperture expands and the pressure decreases, thus achieving secondary adjustment of the extrusion pressure.

[0021] Furthermore, the mechanical needle 2 and the nozzle adjustment plate 12 are dually adjustable to adapt to the pressure requirements of different materials, improving printing adaptability. The sliding connection and hinge structure facilitate dynamic adjustment, and the simple structure makes it easy to maintain later.

[0022] Please see Figures 1 to 3 A pressure chamber 9 is provided at the center where the housing 1 intersects with the glue inlet pipe 5, and the pressure chamber 9 is interconnected with the first through hole and the second through hole.

[0023] Based on the above, the pressure chamber 9 serves as a buffer space for material flow. When the material enters the pressure chamber 9 from the inlet tube 5, the increased space creates a pressure buffer, preventing instantaneous pressure fluctuations. At the same time, the pressure chamber 9 homogenizes the pressure field before the material enters the outlet tube 6. Combined with the adjustment of the mechanical needle 2, this ensures stable extrusion pressure.

[0024] Furthermore, by using pressure chamber 9 to buffer the impact of material flow, the impact of pressure fluctuations on extrusion accuracy is reduced, while the internal pressure is balanced to reduce the incidence of printing defects such as filament breakage and voids.

[0025] Please see Figures 1 to 3 The other end of the nozzle adjusting plate 12 is fixedly connected to a second spring 13, and the other end of the second spring 13 is fixedly connected to the inner side wall of the groove portion of the nozzle 10. A bolt 11 is provided on one side of the second spring 13, and the bolt 11 passes through the inner side wall of the groove portion of the nozzle 10 and contacts the nozzle adjusting plate 12. The bolt 11 is threadedly connected to the nozzle 10, and the bolt 11 can adjust and fix the angle adjusted by the nozzle adjusting plate 12.

[0026] Based on the above, the second spring 13 provides a restoring force and fixes the nozzle adjusting plate 12. When the bolt 11 is tightened, the bolt 11 pushes the nozzle adjusting plate 12 to converge, reduce the orifice diameter, and increase the extrusion pressure. When the bolt 11 is loosened, the second spring 13 drives the nozzle adjusting plate 12 to disperse, expand the orifice diameter, and reduce the pressure. The bolt 11 can fix the adjusted angle.

[0027] Furthermore, the second spring 13 and the bolt 11 work together to enable manual adjustment and automatic reset, making operation convenient and the angle fixed and reliable. In the future, the nozzle can be finely adjusted by the bolt without disassembling the nozzle, reducing maintenance costs and improving adjustment efficiency.

[0028] Please see Figure 1 To the end Figure 3 The housing 1 has a support block 14 installed inside, and the mechanical needle 2 passes through the axis of the support block 14 and is slidably connected to the support block 14.

[0029] Based on the above, the support block 14 provides axial sliding guide support for the mechanical needle 2, ensuring that the mechanical needle 2 maintains coaxiality during movement, and avoiding uneven gap between the mechanical needle 2 and the second through hole due to offset, which would affect the pressure adjustment accuracy.

[0030] Furthermore, to improve the stability of the movement of the mechanical needle 2 and prevent pressure fluctuations caused by shaking, the sliding cooperation between the support block 14 and the mechanical needle 2 can reduce friction and make the adjustment process smoother.

[0031] Please see Figure 1 To the end Figure 3 The support block 14 has a first fixing ring 3 on its right side, and the first fixing ring 3 is fixedly connected to the mechanical needle 2. The inner side of the right end of the housing 1 is fixedly connected to a second fixing ring 8, and a first spring 7 is provided between the second fixing ring 8 and the first fixing ring 3.

[0032] Based on the above, the first spring 7 is mounted on the mechanical needle. When the threaded cap 4 pushes the mechanical needle 2 to the right, the first spring 7 is compressed to generate a reverse thrust, which keeps the mechanical needle 2 in a stable position. When the internal pressure fluctuates, the spring can absorb the impact and prevent the mechanical needle 2 from shifting. The first fixing ring 3 moves with the mechanical needle, and the second fixing ring 8 is fixed on the housing. Both limit the compression stroke of the spring and ensure that the adjustment range of the mechanical needle 2 is controllable.

[0033] Furthermore, the first spring 7 maintains the position of the mechanical needle 2 to prevent sudden changes in extrusion pressure due to pressure fluctuations. The fixed ring and the spring work together to form an elastic support, improving the anti-interference ability of pressure regulation.

[0034] Please see Figure 1 The left end of the housing 1 is threadedly connected to a threaded cap 4, and the inner sidewall of the threaded cap 4 is rotatably connected to the left end of the mechanical needle 2.

[0035] Based on the above, the threaded cap 4 is connected to the housing 1 by threads. When the threaded cap 4 is rotated, its inner wall is rotated to the left end of the mechanical needle 2, causing the mechanical needle 2 to move axially. Rotating the threaded cap 4 clockwise pushes the mechanical needle to the right and into the dispensing tube 6. Rotating it counterclockwise drives the mechanical needle 2 to the left and out of the dispensing tube 6, thus achieving precise adjustment of the position of the mechanical needle 2.

[0036] Furthermore, the threaded drive structure is simple and has high adjustment accuracy. The depth of the mechanical needle 2 can be precisely controlled by the rotation angle. The threaded cap 4 is rotatably connected to the mechanical needle 2, which prevents the mechanical needle 2 from rotating synchronously when the threaded cap 4 rotates, ensuring that the mechanical needle moves only along the axial direction and improving the reliability of adjustment.

[0037] In summary, this 3D printing material extrusion pressure adjustment structure, during use, adjusts the pressure of the colloid during extrusion by engaging the conical mechanical needle 2 at the end of the housing 1 with the second through hole inside the dispensing tube 6, thus adapting to the pressure requirements of different materials. The nozzle adjustment plate 12, hinged to the end of the nozzle 10, is brought together or dispersed by the second spring 13 and bolt 11 to adjust the pressure of the colloid during ejection. This dual adjustment adapts to the pressure requirements of different materials, while also improving extrusion accuracy and quality. Furthermore, the threaded cap 4, rotatably connected to the end of the mechanical needle 2, allows the mechanical needle 2 to move only axially by rotating the threaded cap 4, improving the precision of the mechanical needle 2's position adjustment and enhancing the reliability of the adjustment.

[0038] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances. Moreover, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A 3D printing material extrusion pressure adjustment structure, comprising a housing (1), an inlet tube (5), and an outlet tube (6), wherein the end of the housing (1) is fixedly connected to the upper half of the inlet tube (5), the outlet tube (6) is fixedly connected to the outer surface of the inlet tube (5), and a first through hole is provided inside the inlet tube (5), and a second through hole is provided inside the outlet tube (6), wherein the first through hole and the second through hole are interconnected, characterized in that: A mechanical needle (2) is provided at the axial center of the housing (1), and the end of the mechanical needle (2) is conical. The conical end of the mechanical needle (2) passes through the glue inlet tube (5) and extends into the glue outlet tube (6). The second through hole matches the maximum diameter of the mechanical needle (2). The mechanical needle (2) is slidably connected to the housing (1), the glue inlet tube (5), and the glue outlet tube (6). A nozzle (10) is threadedly connected to the outer surface of the glue outlet tube (6), and a groove is provided at the end of the nozzle (10). An array of nozzle adjustment plates (12) is provided inside the groove. The end of the nozzle adjustment plate (12) is hinged to the nozzle (10), and the nozzle adjustment plate (12) can be gathered or dispersed.

2. The 3D printing material extrusion pressure adjustment structure according to claim 1, characterized in that: A pressure chamber (9) is provided at the center where the housing (1) intersects with the glue inlet pipe (5), and the pressure chamber (9) is interconnected with the first through hole and the second through hole.

3. The 3D printing material extrusion pressure adjustment structure according to claim 2, characterized in that: The other end of the nozzle adjusting plate (12) is fixedly connected to a second spring (13), and the other end of the second spring (13) is fixedly connected to the inner wall of the groove portion of the nozzle (10). A bolt (11) is provided on one side of the second spring (13), and the bolt (11) passes through the inner wall of the groove portion of the nozzle (10) and contacts the nozzle adjusting plate (12). The bolt (11) is threadedly connected to the nozzle (10), and the bolt (11) can adjust and fix the angle of adjustment of the nozzle adjusting plate (12).

4. The 3D printing material extrusion pressure adjustment structure according to claim 3, characterized in that: The housing (1) is equipped with a support block (14), and the mechanical needle (2) passes through the axis of the support block (14) and is slidably connected to the support block (14).

5. The 3D printing material extrusion pressure adjustment structure according to claim 4, characterized in that: The support block (14) is provided with a first fixing ring (3) on the right side, and the first fixing ring (3) is fixedly connected to the mechanical needle (2). The inner side of the right end of the housing (1) is fixedly connected with a second fixing ring (8), and a first spring (7) is provided between the second fixing ring (8) and the first fixing ring (3).

6. The 3D printing material extrusion pressure adjustment structure according to claim 5, characterized in that: The left end of the housing (1) is threaded with a threaded cap (4), and the inner sidewall of the threaded cap (4) is rotatably connected to the left end of the mechanical needle (2).

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