3D printing flow precision control device

Abstract

The present invention discloses a 3D printing flow precision control device, which relates to the field of additive manufacturing technology. The main structure includes an upper connecting shell and a lower connecting shell; an inlet connecting pipe is provided on the top of the upper connecting shell, a connecting core is provided between the upper connecting shell and the lower connecting shell, and the bottom of the inlet connecting pipe is connected to the top of the connecting core; a temperature sensing block and a heating block are provided in the lower middle part of the connecting core in the lower connecting shell from top to bottom; the bottom of the accommodating cavity is connected to the nozzle; an inflow hole connected to the accommodating cavity is provided in the middle of the connecting core; a sealing surface for blocking the accommodating cavity and the nozzle is provided at the bottom of the connecting core; an electromagnet is provided in the lower connecting shell, and an attraction block is provided at the bottom of the electromagnet, which is connected to the heating block. The 3D printing flow precision control device in the present invention can realize the real-time closure of the 3D printer nozzle by controlling the on-off of the internal extrusion channel through the solenoid valve. It can avoid the occurrence of conditions such as drawing caused by continuous supply or residue of materials.

Description

Technical Field

[0001] The present invention relates to the technical field of additive manufacturing, and in particular to a 3D printing flow precision control device. Background Art

[0002] Additive manufacturing, commonly known as 3D printing, is a rapid prototyping technology. It builds objects layer by layer by heating and melting polymer 3D printing filaments based on digital model files and slices. This technology not only effectively improves material utilization but also enables the rapid creation of complex structures that are difficult to process using traditional methods. However, fused deposition printing (FDP) requires high filament diameter stability and surface cleanliness. Only a few materials meet these requirements for commercial production, resulting in a limited selection of filaments and high production costs. FDP filaments for reinforced composites are even more difficult and expensive to prepare, hindering further improvements in the mechanical properties of printed products. Furthermore, the flow rate and speed of FDP are limited by the filament diameter and speed, hindering production efficiency. New melt extrusion 3D printers, on the other hand, use pelletized feedstock as consumables, eliminating the need for secondary processing to produce filaments, thus reducing unnecessary time and cost. The introduction of FDP 3D printers will improve the performance of plastic products and expand the application scope of 3D printing.

[0003] Existing pellet extrusion 3D printers use a rotating screw to squeeze molten material into a nozzle. When printing stops, the nozzle remains unobstructed, which can easily cause stringing and excessive spraying, affecting the surface quality of the product. Therefore, a device that can control the nozzle channel shutoff is urgently needed. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a 3D printing flow precision control device, which can realize the real-time shutdown of the 3D printer nozzle and avoid the occurrence of stringing and other conditions caused by continuous supply or residue of materials.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a 3D printing flow precision control device, comprising an upper connecting shell and a lower connecting shell; the bottom of the upper connecting shell is connected to the top of the lower connecting shell; an inlet connecting pipe is provided on the top of the upper connecting shell, a connecting core is provided between the upper connecting shell and the lower connecting shell, and the bottom of the inlet connecting pipe is communicated with the top of the connecting core; a temperature sensing block and a heating block are sequentially provided in the lower middle part of the connecting core from top to bottom in the lower connecting shell, and an accommodating cavity is formed between the inner walls of the temperature sensing block and the heating block and the outer wall of the connecting core; the bottom of the accommodating cavity is communicated with the nozzle; an inflow hole communicating with the accommodating cavity is provided in the middle of the connecting core; a sealing surface for blocking the accommodating cavity and the nozzle is provided at the bottom of the connecting core; an electromagnet is provided in the lower connecting shell, an attraction block is provided at the bottom of the electromagnet, and the attraction block is connected to the heating block.

[0007] Optionally, a guide column is provided between the top of the upper connecting shell and the lower connecting shell, and the attraction block is slidably provided on the guide column; a spring is provided on the guide column, and the spring is located between the top of the upper connecting shell and the top of the attraction block.

[0008] Optionally, the inflow hole is a cross-shaped hole.

[0009] Optionally, the temperature sensing block is connected to the heating block via threads.

[0010] Optionally, the bottom of the accommodating cavity is a conical surface, and the bottom of the connecting core matches the conical surface.

[0011] Optionally, a fixing plate is provided above the upper connecting shell, and external threads are provided around the top of the fixing plate, and the external threads are used to connect to a 3D printer.

[0012] Optionally, a bottom plate is provided below the lower connecting shell.

[0013] Optionally, the nozzle is connected to the bottom of the heating block via threads.

[0014] Compared with the prior art, the present invention has achieved the following technical effects:

[0015] The precise 3D printing flow control device of this invention uses a solenoid valve to control the opening and closing of an internal extrusion channel, enabling real-time shutdown of the 3D printer's nozzle. When printing stops, the solenoid valve energizes, closing the extrusion channel and halting material output. This prevents stringing and other issues caused by continuous material supply or residual material. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a schematic structural diagram of the 3D printing flow precision control device of the present invention;

[0018] Figure 2 This is a schematic structural diagram of the 3D printing flow precision control device of the present invention in an uncut-off state;

[0019] Figure 3 This is a schematic diagram of the structure of the 3D printing flow precision control device of the present invention in the cut-off state.

[0020] Explanation of the accompanying drawings: 1. Inlet connecting pipe; 2. Fixing plate; 3. Upper connecting shell; 4. Connecting core; 5. Temperature sensing block; 6. Heating block; 7. Electromagnet; 8. Attraction block; 9. Bottom plate; 10. Nozzle; 11. Guide column; 12. Lower connecting shell. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] like Figures 1 to 3 As shown, this embodiment provides a 3D printing flow precision control device, including an upper connecting shell 3 and a lower connecting shell 12; the bottom of the upper connecting shell 3 is connected to the top of the lower connecting shell 12; an inlet connecting pipe 1 is provided on the top of the upper connecting shell 3, and a connecting core 4 is provided between the upper connecting shell 3 and the lower connecting shell 12, and the bottom of the inlet connecting pipe 1 is connected to the top of the connecting core 4; a temperature sensing block 5 and a heating block 6 are provided in the lower middle part of the connecting core 4 in the lower connecting shell 12, and an accommodating cavity is formed between the inner walls of the temperature sensing block 5 and the heating block 6 and the outer wall of the connecting core 4; the bottom of the accommodating cavity is connected to the nozzle 10; a cross-shaped inflow hole connected to the accommodating cavity is provided in the middle of the connecting core 4; a sealing surface for blocking the accommodating cavity and the nozzle 10 is provided at the bottom of the connecting core 4; an electromagnet 7 is provided in the lower connecting shell 12, and an attraction block 8 is provided at the bottom of the electromagnet 7, and the attraction block 8 is connected to the heating block 6.

[0023] In this specific embodiment, a fixing plate 2 is provided above the upper connecting shell 3 , and external threads are provided around the top of the fixing plate 2 , and the external threads are used to connect to the 3D printer.

[0024] A bottom plate 9 is provided below the lower connecting shell 12 .

[0025] A guide column 11 is provided between the top of the upper connecting shell 3 and the lower connecting shell 12, and the attraction block 8 is slidably provided on the guide column 11; a spring is provided on the guide column 11, and the spring is located between the top of the upper connecting shell 3 and the top of the attraction block 8.

[0026] The temperature sensor 5 is threadedly connected to the heating block 6. The top of the connecting core 4 is threadedly connected to the bottom of the inlet connecting pipe 1. A limit ring is installed at the top of the inlet connecting pipe 1. The diameter of the limit ring is larger than the opening at the top of the fixing plate 2, thus providing axial restraint for the inlet connecting pipe 1. The nozzle 10 is threadedly connected to the bottom of the heating block 6, facilitating nozzle 10 replacement.

[0027] The bottom of the accommodating cavity is a conical surface, and the bottom of the connecting core 4 matches the conical surface. The on-off control of the extrusion channel is achieved by utilizing the cooperation between the conical surface and the bottom of the connecting core 4.

[0028] In a more specific embodiment, when the electromagnet 7 loses power, there is a gap of 2 mm between the conical surface of the bottom of the accommodating cavity and the bottom of the connecting core 4 to ensure that the extrusion channel is unobstructed.

[0029] When the retracement is not enabled (retracement means closing the channel):

[0030] The heated, molten plastic pellets enter the inlet cavity under the action of the screw. Gravity forces the molten plastic into the connecting cavity, where it continues to flow downward through the cross-shaped hole in the connecting cavity and into the receiving chamber. When the retraction function is disabled, the spring creates a 2mm gap between the bottom cone of the connecting core 4 and the inner conical surface of the heating block 6. The molten plastic flows into this gap and downward, ultimately being extruded through the nozzle 10.

[0031] When retracement is enabled:

[0032] The process of plastic flowing into the temperature sensing block 5 and the heating block 6 is the same as when the retraction is not turned on. The granular plastic enters the inlet cavity after being heated and melted. As the molten plastic continues to enter the inlet cavity, the molten plastic flows into the connecting core 4. The molten plastic flows into the temperature sensing block 5 and the heating block 6 from the cross hole of the connecting core 4. When the retraction is turned on, the electromagnet 7 is energized to generate a magnetic field. The electromagnet 7 attracts the attraction block 8, and the attraction block 8 is forced to move upward and drives the temperature sensing block 5 and the heating block 6 to move upward, so that the bottom cone of the upper flow channel fits tightly with the inner cone surface of the lower flow channel, so that the molten plastic cannot continue to flow downward, and the retraction is completed.

[0033] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all perspectives, the embodiments should be regarded as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description. It is intended that all changes within the meaning and range of equivalents of the claims be included in the present invention, and any reference signs in the claims should not be construed as limiting the claims to which they relate.

[0034] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. 3D printing flow precision control device, characterized in that, The cam is connected to the bottom of the heating unit, and the bottom of the heating unit is connected to the bottom of the heating unit.

2. The 3D printing flow precision control device according to claim 1, characterized in that: A guide column is provided between the top of the upper connecting shell and the lower connecting shell, and the attraction block is slidably provided on the guide column; a spring is provided on the guide column, and the spring is located between the top of the upper connecting shell and the top of the attraction block.

3. The 3D printing flow precision control device according to claim 1, characterized in that: The inflow hole is a cross-shaped hole.

4. The 3D printing flow precision control device according to claim 1, characterized in that: The temperature sensing block is connected to the heating block via threads.

5. The 3D printing flow precision control device according to claim 1, characterized in that: A fixing plate is provided above the upper connecting shell, and external threads are provided around the top of the fixing plate, and the external threads are used to connect to a 3D printer.

6. The 3D printing flow precision control device according to claim 1, characterized in that: A bottom plate is provided below the lower connecting shell.

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