Particle 3D printing extrusion head

Abstract

The utility model discloses a granular material 3D printing extrusion head, the bottom end is provided with a feeding pipe of a nozzle, the surface of the feeding pipe is fixedly connected with a cooling block, the surface of the cooling block is fixedly connected with a feeding pipe, and the bottom end of the feeding pipe is communicated with the top of the inner cavity of the feeding pipe; the diameter of the inner wall of the feeding pipe is gradually reduced from top to bottom, and a large-diameter screw rod is rotationally arranged on the upper portion of an inner cavity of the feeding pipe. According to the granular material 3D printing extrusion head, after granular materials enter an inner cavity of a feeding pipe from a feeding pipe, the granular materials in the inner cavity of the feeding pipe are heated through a heating core, torsion is output through a driving mechanism, and a large-diameter screw rod is driven to rotate, stir, melt and exhaust, so that a nozzle outputs certain pressure; and the large-diameter screw rod and the small-diameter screw rod are matched with the change between the inner walls of the feeding pipe, so that the pushing pressure is increased, and the smooth flowing of the granular material in the extrusion head is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to 3D printing extrusion head technical field, concretely is a granular material 3D printing extrusion head. BACKGROUND

[0002] Granular material 3D printing extrusion head, FDM 3D printing is by the disc consumables through motor rotation to give consumables certain forward or backward thrust through heat melting, and the disc consumables is by plastic rice through a series of process processing into a certain diameter wire and is rolled into a certain weight roll material, and granular material 3D printing extrusion head directly by plastic rice through granular material 3D printing extrusion head (referred to as printing head) straight knot forming, reduces heat melting, the process of forming, and some high-temperature easy aging material has increased life.

[0003] Granular material 3D printing extrusion head is widely used in industrial manufacturing field, such as prototype making, custom parts production, tool and fixture manufacturing, but the existing granular material 3D printing extrusion head, in the use process, push pressure is small, lead to in the use process, cannot ensure that granular material flows smoothly in the extrusion head, easily lead to material supply shortage in the printing process, affect the continuity and stability of printing, reduce the quality of finished product. UTILITY MODEL CONTENT

[0004] In view of the defects of the prior art, the utility model provides a granular material 3D printing extrusion head, solves the problem that the existing granular material 3D printing extrusion head, push pressure is small, lead to in the use process, cannot ensure that granular material flows smoothly in the extrusion head.

[0005] To realize above-mentioned purpose, the utility model is realized through following technical scheme: a granular material 3D printing extrusion head, including the feeding pipe that the nozzle is set in the bottom, the surface of feeding pipe is fixedly connected with cooling block, the surface of cooling block is fixedly connected with feed pipe, the bottom of feed pipe is communicated with the top of feeding pipe inner chamber, the diameter of feeding pipe inner wall gradually reduces from top to bottom;

[0006] The upper portion of feeding pipe inner chamber is rotationally provided with a large-diameter screw rod, the bottom end of the large-diameter screw rod is fixedly connected with a small-diameter screw rod extending to the bottom of the feeding pipe inner chamber, the surface of the feed pipe is fixedly connected with a driving mechanism for driving the large-diameter screw rod to rotate, and the lower portion of the nozzle surface is provided with a heating core.

[0007] Further, the driving mechanism comprises a support plate, a driving motor and a shaft coupling, the support plate is fixedly connected to the side wall of the feeding pipe, the driving motor is fixedly connected to the upper surface of the support plate, the output shaft of the driving motor is rotatably extended below the support plate, the top end of the large-diameter screw rod is rotatably extended above the cooling block, and the large-diameter screw rod is detachably connected with the output shaft of the driving motor through the shaft coupling.

[0008] Further, the top end of the feeding pipe is fixedly connected with a connecting pipe, and the outer surface of the connecting pipe is fixedly connected with a sealing piece.

[0009] Further, the outer surface of the feeding pipe is fixedly connected with a protective shell, and the protective shell covers the outside of the heating core.

[0010] Further, the surface of the cooling block is fixedly connected with a mounting plate, and the surface of the mounting plate is provided with a plurality of mounting holes.

[0011] Compared with the prior art, after the granular material enters the inner cavity of the feeding pipe, the granular material in the inner cavity of the feeding pipe is heated by the heating core, and the driving mechanism outputs a torque, which drives the large-diameter screw rod to rotate, stirs, melts and exhausts, so that the nozzle outputs a certain pressure, and the change between the inner wall of the feeding pipe and the large-diameter screw rod and the small-diameter screw rod increases the pushing pressure and rapidly exhausts, so that the granular material flows smoothly in the extrusion head, avoids the situation that the material supply is insufficient during printing, improves the continuity and stability of printing, and improves the product quality. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a front sectional view structure schematic diagram of the utility model;

[0013] Figure 2 It is a structure schematic diagram of the connecting pipe and the sealing piece in the utility model.

[0014] In the drawing: 1, driving motor; 2, connecting pipe; 3, feeding pipe; 4, cooling block; 5, heating core; 6, nozzle; 7, feeding pipe; 8, shaft coupling; 9, large-diameter screw rod; 10, small-diameter screw rod; 11, mounting plate; 12, protective shell; 13, sealing piece; 14, support plate. DETAILED DESCRIPTION

[0015] Clearly and completely describe the technical scheme in the embodiments of the utility model with reference to the drawings in the embodiments of the utility model, obviously, the described embodiments are only a part of the embodiments of the utility model, and not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the scope of the utility model protection.

[0016] Please refer to Figure 1 With Figure 2 The utility model provides a kind of technical scheme: a granular material 3D printing extrusion head, including the feeding pipe 7 of bottom end being provided with nozzle 6, the surface of feeding pipe 7 is fixedly connected with cooling block 4, the surface of cooling block 4 is fixedly connected with feed pipe 3, the bottom of feed pipe 3 is communicated with the top of feeding pipe 7 inner cavity, the diameter of feeding pipe 7 inner wall gradually reduces from top to bottom.

[0017] The upper portion of feeding pipe 7 inner cavity is rotatably provided with large diameter screw rod 9, the bottom of large diameter screw rod 9 is fixedly connected with small diameter screw rod 10 extending to the bottom of feeding pipe 7 inner cavity, the surface of feed pipe 3 is fixedly connected with driving mechanism for driving large diameter screw rod 9 to rotate, and the lower portion of nozzle 6 surface is provided with heating core 5.

[0018] After granular material enters the inner cavity of feeding pipe 7 from feed pipe 3, heating core 5 heats the granular material in the inner cavity of feeding pipe 7, and the driving mechanism outputs torque, which drives large diameter screw rod 9 to rotate, stirs, melts and exhausts, so that nozzle 6 outputs a certain pressure, and cooperates with the change between large diameter screw rod 9 and small diameter screw rod 10 and the inner wall of feeding pipe 7 to increase the pushing pressure and quickly exhaust.

[0019] Ensure that granular material flows smoothly in the extrusion head, avoid the situation of insufficient material supply during printing, improve the continuity and stability of printing, and thus improve the quality of finished products.

[0020] Cooling block 4 ensures that hot-melt plastic rice does not stick, improves the flowability and smoothness of extrusion, and is beneficial to printing processing.

[0021] The driving mechanism includes support plate 14, driving motor 1 and coupling 8, support plate 14 is fixedly connected to the side wall of feed pipe 3, and driving motor 1 is fixedly connected to the upper surface of support plate 14.

[0022] The output shaft of driving motor 1 extends to the lower portion of support plate 14, the top end of large diameter screw rod 9 extends to the upper portion of cooling block 4, and is detachably connected with the output shaft of driving motor 1 through coupling 8.

[0023] After the driving motor 1 works, the large-diameter screw rod 9 can be driven to rotate through the connection of the shaft coupling 8, and the small-diameter screw rod 10 is driven to rotate together.

[0024] The top end of the feeding pipe 3 is fixedly connected with the connecting pipe 2, the outer surface of the connecting pipe 2 is fixedly connected with the sealing piece 13, the connecting pipe 2 is convenient for the butt joint of external feeding equipment, and the sealing piece 13 improves the sealing property after butt joint.

[0025] The outer surface of the feeding pipe 7 is fixedly connected with the protective shell 12, the protective shell 12 covers the outside of the heating core 5, the protective shell 12 protects the heating core 5, improves the protection of the heating core 5, and prolongs the service life of the heating core 5.

[0026] The surface of the cooling block 4 is fixedly connected with the mounting plate 11, the surface of the mounting plate 11 is provided with a plurality of mounting holes and cooling holes, and the cooling medium includes but is not limited to cooling water, oil and gas.

[0027] In work, the granular material enters the inner cavity of the feeding pipe 7 from the feeding pipe 3, is heated by the heating core 5, and is outputted by the driving mechanism, so that the nozzle 6 outputs a certain pressure, the change between the inner wall of the feeding pipe 7 and the large-diameter screw rod 9 and the small-diameter screw rod 10 is increased, the pushing pressure is increased, the exhaust is quickly exhausted, the granular material is smoothly flowed in the extrusion head, the situation that the material supply is insufficient in the printing process is avoided, and the continuity and stability of printing are improved.

[0028] It should be noted that, in the present text, relational terms such as first and second and the like can only be used to distinguish one entity or action from another entity or action, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover non-exclusive inclusions, so that a process, method, article, or apparatus including a series of elements includes not only those elements, but also other elements not explicitly listed or inherent to such a process, method, article, or apparatus.

[0029] The above only describes the preferred embodiments of the present application, and does not limit the present application, and any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A granular material 3D printing extruder, comprising a feeding tube (7) with a nozzle (6) at its bottom end, characterized in that: A cooling block (4) is fixedly connected to the surface of the feeding pipe (7), and a feed pipe (3) is fixedly connected to the surface of the cooling block (4). The bottom end of the feed pipe (3) is connected to the top of the inner cavity of the feeding pipe (7), and the diameter of the inner wall of the feeding pipe (7) gradually decreases from top to bottom. A large-diameter spiral rod (9) is rotatably provided on the upper part of the inner cavity of the feeding pipe (7). A small-diameter spiral rod (10) extending to the bottom of the inner cavity of the feeding pipe (7) is fixedly connected to the bottom end of the large-diameter spiral rod (9). A driving mechanism for driving the large-diameter spiral rod (9) to rotate is fixedly connected to the surface of the feed pipe (3). A heating core (5) is provided on the lower part of the surface of the nozzle (6).

2. The granular material 3D printing extruder according to claim 1, characterized in that: The drive mechanism includes a support plate (14), a drive motor (1), and a coupling (8). The support plate (14) is fixedly connected to the side wall of the feed pipe (3). The drive motor (1) is fixedly connected to the upper surface of the support plate (14). The output shaft of the drive motor (1) extends rotatably to the bottom of the support plate (14). The top end of the large-diameter spiral rod (9) extends rotatably to the top of the cooling block (4) and is detachably connected to the output shaft of the drive motor (1) through the coupling (8).

3. The granular material 3D printing extruder according to claim 1, characterized in that: The top end of the feed pipe (3) is fixedly connected to a connecting pipe (2), and a sealing element (13) is fixedly connected to the outer surface of the connecting pipe (2).

4. The granular material 3D printing extruder according to claim 1, characterized in that: A protective shell (12) is fixedly connected to the outer surface of the feeding tube (7), and the protective shell (12) covers the outside of the heating core (5).

5. The granular material 3D printing extruder according to claim 1, characterized in that: The surface of the cooling block (4) is fixedly connected to a mounting plate (11), and the surface of the mounting plate (11) is provided with a plurality of mounting holes.

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