Double-melting-part spray head of 3D printer and working method of double-melting-part spray head

Abstract

The invention discloses a double-melting-piece spray head of a 3D printer and a working method of the double-melting-piece spray head. The spray head comprises a first-stage melting piece which is connected with a first-stage heating block and can conduct heat; the second-stage melting piece is connected with the second-stage heating block and can conduct heat; the heat insulation part is mounted between the primary melting part and the secondary melting part to block heat transfer; wherein the first-stage melting piece and the second-stage melting piece are communicated with each other, and consumables sequentially pass through the first-stage melting piece and the second-stage melting piece to be extruded outwards. The first-stage melting piece and the second-stage melting piece are arranged and are respectively heated, so that the heating temperatures of different areas of the spray head can be more finely adjusted, and the extrusion state of consumables is further changed. The invention relates to the technical field of 3D printers.

Description

Technical Field

[0001] The present application relates to the technical field of 3D printers, and in particular to a dual-melting-piece nozzle of a 3D printer and a working method thereof. Background Art

[0002] Fused Deposition Modeling (FDM) is a 3D printing technology that works by melting thermoplastic materials and extruding them layer by layer for additive manufacturing. In FDM 3D printers, the nozzle is an important component, which contains a molten part. After being heated, the molten part can melt the linear consumables. The unmelted consumables at the back are pushed by the extruder to extrude the melted consumables from the molten part, thereby completing the subsequent additive molding process.

[0003] To ensure that the material is fully melted, the temperature of the molten part must be higher than the melting point of the consumables. The higher the temperature, the better the material fluidity and the faster the printing speed. However, at the same time, at the ejection end of the nozzle, too high a temperature will make it difficult for the extruded material to cool down and solidify. On the other hand, it may cause the throat to overheat, causing the material to expand and block due to heat, and may also directly cause thermal deterioration of the material.

[0004] Therefore, a new type of nozzle is needed that can meet the different temperature requirements of the molten part and the nozzle outlet. Summary of the invention

[0005] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a dual-melting-piece nozzle of a 3D printer, which can adjust the heating temperature of the melting piece and the nozzle outlet end respectively.

[0006] The present application also proposes a working method for the dual molten element nozzle of the above-mentioned 3D printer.

[0007] According to the first aspect of the present application, a dual-melting element nozzle of a 3D printer includes:

[0008] A primary melting element, which is connected to the primary heating block and capable of heat conduction;

[0009] A secondary melting element connected to the secondary heating block and capable of heat conduction;

[0010] A heat insulating member installed between the primary melting member and the secondary melting member to block heat transfer;

[0011] The primary melting part and the secondary melting part are interconnected, and the consumables are sequentially passed through the primary melting part and the secondary melting part to be extruded outward.

[0012] The dual-melting-piece nozzle of the 3D printer according to the embodiment of the present application has at least the following beneficial effects: by providing a primary melting piece and a secondary melting piece, and heating both of them separately, the heating temperature of different areas of the nozzle can be adjusted more finely, thereby changing the extrusion state of the consumables.

[0013] According to some embodiments of the present application, the thermal insulation member is ring-shaped, a first channel is opened in the primary melting member, a second channel is opened in the secondary melting member, and two ends of the thermal insulation member are respectively connected to the first channel and the second channel.

[0014] According to some embodiments of the present application, the thermal insulation member is a stainless steel thermal insulation ring.

[0015] According to some embodiments of the present application, the second channel includes a straight tube portion and a reducing portion, the two ends of the straight tube portion are respectively connected to the thermal insulation component and the reducing portion, the two ends of the reducing portion are respectively a large diameter end and a small diameter end, the inner diameter of the large diameter end is larger than the inner diameter of the small diameter end, and the large diameter end is connected to the straight tube portion.

[0016] According to some embodiments of the present application, the dual-melting element nozzle of the 3D printer further includes a nozzle, which is connected to the secondary melting element and covers the diameter-changing portion.

[0017] According to some embodiments of the present application, the nozzle is an alloy of brass and stainless steel.

[0018] According to some embodiments of the present application, the dual-melting element nozzle of the 3D printer further includes a heat sink, which is connected to the primary melting element, and a through hole communicating with the first channel is formed in the heat sink.

[0019] According to some embodiments of the present application, the primary molten part is an aluminum alloy part.

[0020] According to some embodiments of the present application, the secondary molten part is an aluminum alloy part.

[0021] According to the working method of the second aspect of the present application, based on the dual molten parts nozzle of the above-mentioned 3D printer, it includes a preheating mode, a fast extrusion mode and an energy-saving mode, wherein:

[0022] The workflow of the preheating mode includes:

[0023] Inserting a consumable into the primary melting part, so that the consumable passes through the primary melting part and the heat insulating part and enters into the secondary melting part;

[0024] Turning on the primary heating block and the secondary heating block, making the temperature of the primary heating block lower than the temperature of the secondary heating block, and maintaining the temperature of the secondary heating block within the melting temperature range of the consumable;

[0025] The consumables pass through the primary melting part, the heat insulating part and the secondary melting part in sequence under the action of the extruder, the consumables are heated in the primary melting part, and are completely melted in the secondary melting part to be extruded outwards;

[0026] The workflow of the fast extrusion mode includes:

[0027] Inserting a consumable into the primary melting part, so that the consumable passes through the primary melting part and the heat insulating part and enters into the secondary melting part;

[0028] Turning on the primary heating block and the secondary heating block, making the temperature of the primary heating block higher than the temperature of the secondary heating block, and maintaining the temperature of the secondary heating block within the melting temperature range of the consumable;

[0029] The consumables pass through the primary melting part, the heat insulating part and the secondary melting part in sequence under the action of the extruder, the consumables are completely melted in the primary melting part, and the temperature of the consumables drops in the secondary melting part so as to be extruded outwards;

[0030] The working process of the energy-saving mode includes:

[0031] Inserting a consumable into the primary melting part, so that the consumable passes through the primary melting part and the heat insulating part and enters into the secondary melting part;

[0032] Turning on the secondary heating block and turning off the primary heating block, wherein the temperature of the secondary heating block is maintained within the melting temperature range of the consumable;

[0033] The consumables pass through the primary melting part, the heat insulating part and the secondary melting part in sequence under the action of the extruder, and the consumables are completely melted in the secondary melting part to be extruded outward.

[0034] According to the working method of the embodiment of the present application, there are at least the following beneficial effects: by changing the on and off states and heating temperatures of the primary heating element and the secondary heating element, it is possible to switch between preheating mode, fast extrusion mode and energy-saving mode, thereby meeting different consumable extrusion requirements.

[0035] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings are used to provide further understanding of the technical solution disclosed in the present application and constitute a part of the specification. Together with the embodiments disclosed in the present application, they are used to explain the technical solution disclosed in the present application and do not constitute a limitation on the technical solution disclosed in the present application.

[0037] Figure 1 This is a cross-sectional view of a dual-melting element nozzle of a 3D printer according to the first embodiment of the present application.

[0038] Reference numerals: 100 - primary melting piece, 110 - first channel, 200 - secondary melting piece, 210 - second channel, 211 - straight tube portion, 212 - diameter reducing portion, 300 - heat insulating piece, 400 - nozzle, 500 - heat dissipating piece. DETAILED DESCRIPTION

[0039] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0040] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0041] In the description of this application, "several" means more than one, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0042] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0043] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0044] In FDM 3D printers, the nozzle is an important component, which is equipped with a molten part. After being heated, the molten part can melt the linear consumables. The unmelted consumables at the back are pushed by the extruder to extrude the melted consumables from the molten part, thereby completing the subsequent additive molding process. To ensure that the material is fully melted, the temperature of the molten part must be higher than the melting point of the consumables. The higher the temperature, the better the fluidity of the material and the faster the printing speed. But at the same time, at the ejection end of the nozzle, excessively high temperature will make it difficult for the extruded material to cool down and solidify on the one hand, and on the other hand, it may cause the throat to overheat, causing thermal expansion and blockage of the material, and may also directly cause thermal deterioration of the material.

[0045] Therefore, a new type of nozzle is needed that can meet the different temperature requirements of the molten part and the nozzle outlet.

[0046] In this regard, the present application proposes a dual-melting piece nozzle for a 3D printer. By setting a primary molten piece 100 and a secondary molten piece 200 and heating them separately, the heating temperature of different areas of the nozzle can be more finely adjusted, thereby changing the extrusion state of the consumables.

[0047] In addition, the present application also proposes a working method for the dual-melting element nozzle of the above-mentioned 3D printer. By changing the opening and closing states and heating temperatures of the primary heating element and the secondary heating element, it is possible to switch between preheating mode, fast extrusion mode and energy-saving mode, thereby meeting different consumable extrusion requirements.

[0048] Reference Figure 1 The dual-melting-piece nozzle of the 3D printer in the first embodiment of the present application includes a primary melting piece 100, a secondary melting piece 200 and a heat insulating piece 300. The primary melting piece 100 and the secondary melting piece 200 can be heated separately, so as to change the heating mode of the consumables by adjusting the heating temperature of the primary melting piece 100 and the secondary melting piece 200. The heat insulating piece 300 is arranged between the primary melting piece 100 and the secondary melting piece 200 to block the heat transfer between the two.

[0049] Specifically, the primary melting piece 100 is connected to the primary heating block and can be heat-conducted with the primary heating block, and the primary heating block is used to heat the primary melting piece 100. The secondary melting piece 200 is connected to the secondary heating block and can be heat-conducted with the secondary heating block, and the secondary heating block is used to heat the secondary melting piece 200.

[0050] The heat insulating member 300 is installed between the primary melting member 100 and the secondary melting member 200 to block heat transfer.

[0051] The primary melting piece 100 and the secondary melting piece 200 are interconnected, and the consumables are sequentially passed through the primary melting piece 100 and the secondary melting piece 200 to be extruded outward.

[0052] Furthermore, the heat insulating member 300 is annular, and its middle is hollowed out so that the consumables can pass through. A first channel 110 is provided in the primary melting member 100, and a second channel 210 is provided in the secondary melting member 200. Both ends of the heat insulating member 300 are connected to the first channel 110 and the second channel 210, respectively. Thus, the consumables can enter from the first channel 110, pass through the hollow part in the middle of the heat insulating member 300, and enter the second channel 210. The primary heating block heats up the first channel 110, and the secondary heating block heats up the second channel 210. The temperatures in the first channel 110 and the second channel 210 may be different, thereby heating different parts of the consumables differentially.

[0053] Specifically, the heat insulating member 300 is a stainless steel heat insulating ring, which has high structural strength and heat resistance, and plays a role in blocking the heat transfer between the primary melting member 100 and the secondary melting member 200.

[0054] Furthermore, the second channel 210 includes a straight barrel portion 211 and a diameter reducing portion 212. The two ends of the straight barrel portion 211 are respectively connected to the heat insulating member 300 and the diameter reducing portion 212, and the two ends of the diameter reducing portion 212 are respectively a large diameter end and a small diameter end, and the inner diameter of the large diameter end is larger than the inner diameter of the small diameter end, and the large diameter end is connected to the straight barrel portion 211. Thus, when the consumable moves under the action of the extruder, it will enter the diameter reducing portion 212 under the guidance of the straight barrel portion 211, and as the consumable moves, the inner diameter of the diameter reducing portion 212 becomes smaller and smaller, increasing the pressure of the molten consumable at the outlet of the small diameter end and improving the flow rate, which facilitates the extrusion of the consumable.

[0055] Furthermore, the dual-melting element nozzle of the 3D printer further includes a nozzle 400, which is connected to the secondary molten element 200 and covers the diameter reducing portion 212. The function of the nozzle 400 is to enhance the structural strength of the secondary molten element 200 at the diameter reducing portion 212, and prevent the diameter reducing portion 212 from being deformed or even damaged under the high temperature and high pressure of the consumable fluid. Specifically, the nozzle 400 is an alloy of brass and stainless steel, which can take into account both thermal conductivity and rigidity.

[0056] Optionally, the dual-melting element nozzle of the 3D printer further includes a heat sink 500, which is connected to the primary melting element 100. A through hole connected to the first channel 110 is provided in the heat sink 500, and the consumables can enter the first channel 110 through the through hole. The heat sink 500 is used to block the heat of the primary melting element 100 and the secondary melting element 200 from being transferred to the 3D printer, thereby reducing the probability of the 3D printer being damaged by heat. A plurality of heat sink fins are provided on the heat sink 500 to increase the contact area with the air to improve the cooling effect.

[0057] Specifically, the primary melting piece 100 and the secondary melting piece 200 are both aluminum alloy pieces, which have high thermal conductivity, thereby improving the heating efficiency of the primary heating piece and the secondary heating piece for the consumables.

[0058] In the second aspect of the present application, a working method of a dual-melting-piece nozzle based on the above-mentioned 3D printer includes a preheating mode, a fast extrusion mode and an energy-saving mode, wherein:

[0059] The workflow of the preheating mode includes:

[0060] S110. Insert the consumable into the primary melting member 100, so that the consumable passes through the primary melting member 100 and the heat insulating member 300 and enters the secondary melting member 200;

[0061] S120. Turn on the primary heating block and the secondary heating block, so that the temperature of the primary heating block is lower than the temperature of the secondary heating block, and the temperature of the secondary heating block is maintained within the melting temperature range of the consumables;

[0062] S130. Under the action of the extruder, the consumables pass through the primary melting piece 100, the heat insulating piece 300 and the secondary melting piece 200 in sequence. The consumables are heated in the primary melting piece 100 and are completely melted in the secondary melting piece 200 to be extruded outward.

[0063] In the preheating mode, the consumables are first preheated by the primary melting part 100, and the consumables are completely melted in the secondary melting part 200 after the temperature of the consumables is raised to a certain level, thereby increasing the temperature change gradient of the consumables and reducing damage to the consumables caused by sudden temperature changes.

[0064] The workflow for Fast Extrusion mode includes:

[0065] S210. Insert the consumable into the primary melting member 100, so that the consumable passes through the primary melting member 100 and the heat insulating member 300 and enters the secondary melting member 200;

[0066] S220. Turn on the primary heating block and the secondary heating block, so that the temperature of the primary heating block is higher than the temperature of the secondary heating block, and the temperature of the secondary heating block is maintained within the melting temperature range of the consumables;

[0067] S230. Under the action of the extruder, the consumables pass through the primary melting piece 100, the heat insulating piece 300 and the secondary melting piece 200 in sequence. The consumables are completely melted in the primary melting piece 100, and the temperature drops in the secondary melting piece 200 to be extruded outward.

[0068] In the fast extrusion mode, the consumables are first completely melted in the primary melt 100, and then the temperature drops when passing through the secondary melt 200, so that the final extrusion temperature is not too high. Since the consumables have been melted in the primary melt 100, the extruder can extrude the consumables faster to speed up the 3D printing speed.

[0069] The energy-saving mode workflow includes:

[0070] S310. Insert the consumable into the primary melting member 100, so that the consumable passes through the primary melting member 100 and the heat insulating member 300 and enters the secondary melting member 200;

[0071] S320. Turn on the secondary heating block and turn off the primary heating block, and maintain the temperature of the secondary heating block within the melting temperature range of the consumables;

[0072] S330. Under the action of the extruder, the consumables pass through the primary melting piece 100, the heat insulating piece 300 and the secondary melting piece 200 in sequence, and the consumables are completely melted in the secondary melting piece 200 to be extruded outward.

[0073] In the energy-saving mode, the primary heating block is turned off, and only the secondary melting unit 200 is used to melt the consumables, thereby reducing energy consumption.

[0074] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present application. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. A dual-melting nozzle for a 3D printer, characterized in that: include: A primary melting element, which is connected to the primary heating block and capable of heat conduction; A secondary melting element connected to the secondary heating block and capable of heat conduction; A heat insulating member installed between the primary melting member and the secondary melting member to block heat transfer; The primary melting part and the secondary melting part are interconnected, and the consumables are sequentially passed through the primary melting part and the secondary melting part to be extruded outward.

2. The dual-melting nozzle of the 3D printer according to claim 1, characterized in that: The heat insulating member is annular, a first channel is provided in the primary melting member, a second channel is provided in the secondary melting member, and two ends of the heat insulating member are respectively connected to the first channel and the second channel.

3. The dual-melting element nozzle of the 3D printer according to claim 2, characterized in that: The heat insulating member is a stainless steel heat insulating ring.

4. The dual-melting element nozzle of the 3D printer according to claim 2, characterized in that: The second channel includes a straight tube portion and a reducing portion, the two ends of the straight tube portion are respectively connected to the heat insulation component and the reducing portion, the two ends of the reducing portion are respectively a large diameter end and a small diameter end, the inner diameter of the large diameter end is larger than the inner diameter of the small diameter end, and the large diameter end is connected to the straight tube portion.

5. The dual-melting element nozzle of the 3D printer according to claim 4, characterized in that: The dual-melting element nozzle of the 3D printer further comprises a nozzle, which is connected to the secondary melting element and covers the diameter-changing portion.

6. The dual-melting element nozzle of the 3D printer according to claim 5, characterized in that: The nozzle is an alloy of brass and stainless steel.

7. The dual-melting element nozzle of the 3D printer according to claim 2, characterized in that: The dual-melting element nozzle of the 3D printer further includes a heat sink, which is connected to the primary melting element, and a through hole communicating with the first channel is formed in the heat sink.

8. The dual-melting element nozzle of a 3D printer according to any one of claims 1 to 7, characterized in that: The primary molten part is an aluminum alloy part.

9. The dual-melting element nozzle of a 3D printer according to any one of claims 1 to 7, characterized in that: The secondary molten part is an aluminum alloy part.

10. A method for operating a dual-melting-piece nozzle of a 3D printer according to any one of claims 1 to 9, characterized in that: It includes preheating mode, fast extrusion mode and energy saving mode, among which: The workflow of the preheating mode includes: Inserting a consumable into the primary melting part, so that the consumable passes through the primary melting part and the heat insulating part and enters into the secondary melting part; Turning on the primary heating block and the secondary heating block, making the temperature of the primary heating block lower than the temperature of the secondary heating block, and maintaining the temperature of the secondary heating block within the melting temperature range of the consumable; The consumables pass through the primary melting part, the heat insulating part and the secondary melting part in sequence under the action of the extruder, the consumables are heated in the primary melting part, and are completely melted in the secondary melting part to be extruded outwards; The workflow of the fast extrusion mode includes: Inserting a consumable into the primary melting part, so that the consumable passes through the primary melting part and the heat insulating part and enters into the secondary melting part; Turning on the primary heating block and the secondary heating block, making the temperature of the primary heating block higher than the temperature of the secondary heating block, and maintaining the temperature of the secondary heating block within the melting temperature range of the consumable; The consumables pass through the primary melting part, the heat insulating part and the secondary melting part in sequence under the action of the extruder, the consumables are completely melted in the primary melting part, and the temperature of the consumables drops in the secondary melting part so as to be extruded outwards; The working process of the energy-saving mode includes: Inserting a consumable into the primary melting part, so that the consumable passes through the primary melting part and the heat insulating part and enters into the secondary melting part; Turning on the secondary heating block and turning off the primary heating block, wherein the temperature of the secondary heating block is maintained within the melting temperature range of the consumable; The consumables pass through the primary melting part, the heat insulating part and the secondary melting part in sequence under the action of the extruder, and the consumables are completely melted in the secondary melting part to be extruded outward.

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