Heating structure for large-diameter large-flow melt extrusion 3D printing

Abstract

The utility model relates to a heating structure for large-diameter large-flow melt extrusion 3D printing, which adopts a double-heating-rod structure, heating rod mounting holes are formed in a left heating part and a right heating part in a penetrating manner, and heating rods are fixedly mounted in the heating rod mounting holes; the upper end and the lower end of the middle extrusion part are fixedly connected with a throat pipe and a nozzle respectively, an extrusion hole is formed in the center of the middle extrusion part in a penetrating mode and communicated with the throat pipe and the nozzle, the short axis of the extrusion hole is consistent with the direction of the center connecting line of the two heating rods, and the extrusion hole is divided into an extrusion hole upper section and an extrusion hole lower section. The upper section of the extrusion hole is of a ratio reducing oval horn mouth structure which is reduced from top to bottom, and the lower end of the extrusion hole is of an oval straight hole structure. By the adoption of the double-heating-rod, special-shaped and variable-diameter extrusion hole structure, the heating uniformity and heating efficiency of large-diameter 3D printing wires are effectively improved, and the melt extrusion 3D printing effect is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of melt extrusion 3D printing, and in particular relates to a heating structure for large-diameter and large-flow melt extrusion 3D printing. Background Art

[0002] During 3D printing, the filament needs to be melted and heated. Currently, conventional melt-extruded 3D printing filaments typically come in diameters of 1.75mm, 2.85mm, and 3.0mm, with smaller diameters resulting in faster melting. However, when using larger diameter filaments, the melting process can lead to high surface temperatures and low internal temperatures due to poor thermal conductivity, making uniform heating difficult. This is particularly true for materials like PLA, impacting print quality.

[0003] Therefore, traditional heating methods are not feasible for heating large-diameter melt-extruded 3D printing filaments and extrusion applications using large nozzles. Traditional heating methods usually handle large-diameter printing filaments by simply increasing the aperture or using a single heating source. However, this method often makes it difficult to achieve uniform heating and efficient extrusion. The resulting temperature unevenness often leads to reduced printing quality and increased instability, affecting the structural integrity and appearance quality of the printed object.

[0004] Therefore, it is necessary to design a heating structure that can be suitable for large-diameter and large-flow melt extrusion 3D printing. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a heating structure for large-diameter and large-flow melt extrusion 3D printing. It adopts a dual heating rod, a special-shaped and variable-diameter extrusion hole structure, and effectively improves the heating uniformity and heating efficiency of large-diameter 3D printing filaments.

[0006] The utility model solves the technical problem by the following technical solutions:

[0007] A heating structure for large-diameter and large-flow melt extrusion 3D printing, comprising a heating block, wherein the heating block is divided into a left heating part, a middle extrusion part and a right heating part, wherein the left heating part and the right heating part are both provided with a heating rod mounting hole, in which a heating rod is fixedly installed; the upper and lower ends of the middle extrusion part are respectively fixedly connected to a throat pipe and a nozzle, an extrusion hole is provided at the center position of the middle extrusion part, the extrusion hole is connected to the throat pipe and the nozzle, the extrusion hole is an elliptical hole, the minor axis of the extrusion hole is consistent with the direction of the center line connecting the two heating rods, the extrusion hole is divided into an upper section of the extrusion hole and a lower section of the extrusion hole, the upper section of the extrusion hole is a variable diameter elliptical trumpet structure that shrinks from top to bottom, and the lower end of the lower section of the extrusion hole is an elliptical straight hole structure.

[0008] Moreover, the minor axis diameter of the ellipse in the top cross-section of the upper section of the extrusion hole is greater than the diameter of the 3D printing filament, and the cross-sectional area of ​​the ellipse in the bottom cross-sectional area of ​​the upper section of the extrusion hole is equal to the cross-sectional area of ​​the 3D printing filament.

[0009] Moreover, an arc block is formed at the front end of the middle extrusion portion, and a sensor mounting hole is provided through the arc block from top to bottom. A temperature sensor is installed in the sensor mounting hole, and the temperature sensor is connected to the extrusion hole.

[0010] Moreover, screw holes are provided on the side walls of the arc block, the left heating part and the right heating part, and the temperature sensor and the heating rod are fixed by screws installed in the screw holes.

[0011] Moreover, the top end of the middle extrusion portion is higher than the left heating portion and the right heating portion, and the upper end of the middle extrusion portion located at the upper section of the extrusion hole and the lower end of the lower section of the extrusion hole are both provided with step surfaces, and the throat and nozzle are respectively threadedly connected to the middle extrusion portion and tightly fit with the step surfaces.

[0012] Moreover, the left heating part and the right heating part are symmetrically arranged on both sides of the middle extrusion part, and the heating rod mounting holes on the left heating part and the right heating part are symmetrically arranged.

[0013] The advantages and beneficial effects of the utility model are:

[0014] 1. This utility model adopts double heating rods, special-shaped and variable-diameter extrusion hole structures to effectively improve the heating uniformity and heating efficiency of large-diameter 3D printing filaments, ensuring the melt extrusion 3D printing effect.

[0015] 2. The minor axis diameter of the elliptical cross-section of the top section of the upper section of the extrusion hole of the present invention is larger than the diameter of the 3D printing filament, and the cross-sectional area of ​​the elliptical cross-section of the bottom section of the upper section of the extrusion hole is equal to the cross-sectional area of ​​the 3D printing filament. The heating filament of the upper section of the extrusion hole changes its cross-sectional shape while heating; the heating filament of the lower section of the extrusion hole maintains an elliptical shape and melts evenly.

[0016] 3. The front end of the middle extrusion part of the utility model is equipped with an arc block, and the arc block is provided with sensor mounting holes from top to bottom. A temperature sensor is installed in the sensor mounting hole. The temperature sensor is connected to the extrusion hole and can monitor the heating temperature of the heating wire in the extrusion hole in real time to ensure the melting effect.

[0017] 4. The arc block, the left heating part and the right heating part of the utility model are provided with screw holes on their side walls. The temperature sensor and the heating rod are fixed by screws installed in the screw holes, thereby ensuring the installation firmness of the heating rod and the temperature sensor and improving the heating effect of the heating wire.

[0018] 5. The top of the middle extrusion part of the utility model is higher than the left heating part and the right heating part. The upper end of the middle extrusion part located at the upper section of the extrusion hole and the lower end of the lower section of the extrusion hole are both provided with step surfaces. The throat and nozzle are respectively threadedly connected to the middle extrusion part and tightly fit with the step surfaces to ensure the sealing of the throat and nozzle with the middle extrusion part, and at the same time can meet the requirements of nozzle replacement in case of damage, and printing with different apertures or different hole types.

[0019] 6. The left heating part and the right heating part of the utility model are symmetrically arranged on both sides of the middle extrusion part, and the heating rod mounting holes on the left heating part and the right heating part are symmetrically arranged to ensure heating symmetry. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the main view of the utility model;

[0021] Figure 2 yes Figure 1 Half-section view;

[0022] Figure 3 for Figure 1 Magnified top view of

[0023] Figure 4 It is a structural diagram of the utility model;

[0024] Figure 5 This is another structural diagram of the present invention.

[0025] Description of Reference Numerals

[0026] 1-throat, 2-left heating part, 3-middle extrusion part, 4-right heating part, 5-nozzle, 6-upper section of extrusion hole, 7-lower section of extrusion hole, 8-screw hole, 9-heating rod mounting hole, 10-extrusion hole, 11-arc block, 12-sensor mounting hole, 13-elliptical hole. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below through specific embodiments. The following embodiments are merely illustrative and non-restrictive, and should not be used to limit the scope of protection of the present invention.

[0028] A heating structure for large-diameter and large-flow melt extrusion 3D printing, the innovation of which lies in: comprising a heating block, the heating block is divided into a left heating part 2, a middle extrusion part 3 and a right heating part 4, the left heating part and the right heating part are both provided with a heating rod mounting hole 9, and a heating rod is fixedly installed in the heating rod mounting hole; the upper and lower ends of the middle extrusion part are respectively fixedly connected to the throat 1 and the nozzle 5, and an extrusion hole 10 is provided at the center position of the middle extrusion part, the extrusion hole is connected to the throat and the nozzle, the extrusion hole is an elliptical hole 13, the short axis of the extrusion hole is consistent with the direction of the center line connecting the two heating rods, the extrusion hole is divided into an upper section 6 of the extrusion hole and a lower section 7 of the extrusion hole, the upper section of the extrusion hole is a variable diameter elliptical trumpet structure that shrinks from top to bottom, and the lower end of the lower section of the extrusion hole is an elliptical straight hole structure.

[0029] The minor axis diameter of the elliptical cross-section at the top end of the upper section of the extrusion hole is greater than the diameter of the 3D printing filament, and the cross-sectional area of ​​the elliptical cross-section at the bottom end of the upper section of the extrusion hole is equal to the cross-sectional area of ​​the 3D printing filament. The heating filament in the upper section of the extrusion hole changes its cross-sectional shape while heating; the heating filament in the lower section of the extrusion hole maintains an elliptical shape and melts evenly.

[0030] An arc block 11 is provided at the front end of the middle extrusion part. A sensor mounting hole 12 is provided through the arc block from top to bottom. A temperature sensor is installed in the sensor mounting hole. The temperature sensor is connected to the extrusion hole and can monitor the heating temperature of the heating wire in the extrusion hole in real time to ensure the melting effect.

[0031] Screw holes are provided on the side walls of the arc block, the left heating part and the right heating part. The temperature sensor and the heating rod are fixed by screws installed in the screw holes, ensuring the installation firmness of the heating rod and the temperature sensor and improving the heating effect of the heating wire.

[0032] The top end of the middle extrusion part is higher than the left heating part and the right heating part. The upper end of the middle extrusion part located at the upper section of the extrusion hole and the lower end of the lower section of the extrusion hole are both provided with step surfaces. The throat and nozzle are respectively threadedly connected to the middle extrusion part and tightly fit with the step surfaces to ensure the sealing of the throat and nozzle with the middle extrusion part, and at the same time can meet the requirements of nozzle damage replacement, different apertures or different hole types.

[0033] The left heating part and the right heating part are symmetrically arranged on both sides of the middle extrusion part, and the heating rod mounting holes on the left heating part and the right heating part are symmetrically arranged to ensure heating symmetry.

[0034] The working principle of this utility model is:

[0035] The 3D printing filament enters the extrusion hole 10 of the middle extrusion part of the utility model from the throat 1, and heating rods are installed in the heating rod installation holes 9 of the left heating part 2 and the right heating part 4. The heating rods are heated by a power supply and form a uniform heat distribution in the left and right heating parts, so that the temperature field to which the printing filament is subjected during the heating process is more uniform, effectively avoiding local overheating or overcooling.

[0036] When the filament enters the elliptical extrusion hole, its short axis aligns with the center of the heating rod, shortening the depth of heat transfer. As the filament passes through the upper bell-shaped structure, it is heated and its shape gradually changes to an elliptical shape, facilitating the subsequent melting process. After entering the lower elliptical straight hole, the filament remains evenly melted under continuous heating, ensuring smooth flow during extrusion and guaranteed printing quality. The elliptical 13-meter design helps improve the melting speed and uniformity of the filament.

[0037] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will understand that various replacements, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A heating structure for large-diameter and large-flow melt extrusion 3D printing, characterized by: The utility model comprises a heating block, which is divided into a left heating part, a middle extrusion part and a right heating part. The left heating part and the right heating part are both provided with a heating rod mounting hole, and a heating rod is fixedly installed in the heating rod mounting hole; the upper and lower ends of the middle extrusion part are fixedly connected to the throat and the nozzle respectively, and an extrusion hole is provided at the center position of the middle extrusion part, and the extrusion hole is connected with the throat and the nozzle. The extrusion hole is an elliptical hole, and the short axis of the extrusion hole is consistent with the direction of the center line connecting the two heating rods. The extrusion hole is divided into an upper section of the extrusion hole and a lower section of the extrusion hole. The upper section of the extrusion hole is a variable diameter elliptical trumpet structure that shrinks from top to bottom, and the lower end of the lower section of the extrusion hole is an elliptical straight hole structure.

2. The large-diameter, large-flow melt extrusion 3D printing heating structure according to claim 1, characterized in that: The minor axis diameter of the elliptical cross-section of the top end of the upper section of the extrusion hole is greater than the diameter of the 3D printing filament, and the cross-sectional area of ​​the elliptical cross-section of the bottom end of the upper section of the extrusion hole is equal to the cross-sectional area of ​​the 3D printing filament.

3. The large-diameter, large-flow melt extrusion 3D printing heating structure according to claim 1, characterized in that: An arc block is formed at the front end of the middle extrusion portion. A sensor mounting hole is provided through the arc block from top to bottom. A temperature sensor is installed in the sensor mounting hole, and the temperature sensor is connected to the extrusion hole.

4. The large-diameter, large-flow melt extrusion 3D printing heating structure according to claim 3, characterized in that: Screw holes are provided on the side walls of the arc block, the left heating part and the right heating part, and the temperature sensor and the heating rod are fixed by screws installed in the screw holes.

5. The large-diameter, large-flow melt extrusion 3D printing heating structure according to claim 1, characterized in that: The top end of the middle extrusion part is higher than the left heating part and the right heating part. The upper end of the middle extrusion part located at the upper section of the extrusion hole and the lower end of the lower section of the extrusion hole are both provided with step surfaces. The throat and the nozzle are respectively threadedly connected to the middle extrusion part and tightly fit with the step surfaces.

6. The large-diameter, large-flow melt extrusion 3D printing heating structure according to claim 1, characterized in that: The left heating part and the right heating part are symmetrically arranged on both sides of the middle extrusion part, and the heating rod mounting holes on the left heating part and the right heating part are symmetrically arranged.

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