3D printer nozzle and 3D printing head

Abstract

The invention discloses a 3D printer nozzle which comprises a nozzle body, a through flow channel is formed in the nozzle body, a plug core is arranged in the nozzle body and comprises a sleeve, a plurality of material guide plates are arranged in the circumferential direction of the inner wall of the sleeve, and every two adjacent material guide plates are arranged according to a preset spacing distance. Each material guide plate is provided with a plurality of material guide faces, and the multiple material guide plates are arranged around the flow channel at the same time. By arranging the plug core, the contact area between the interior of the nozzle and the consumable is increased, the flowing time of the consumable in the nozzle is prolonged, the melting amount of the consumable is increased in unit time, then the extrusion speed is increased, and the purposes of increasing the flow and improving the printing efficiency are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and specifically to a 3D printer nozzle and a 3D print head. Background Art

[0002] The print head is the printing material output mechanism of a 3D printer. The print head generally consists of a throat tube, a heating block, a heating rod, a thermistor and a nozzle. Its working principle is as follows: The heating rod is powered on to heat the heating block. Then, the printing consumable enters from the upper end of the throat tube. Usually, the diameter of the consumable is 1.75 mm. The consumable is heated at the lower end of the throat tube (the part where the throat tube is screwed into the heating block) to preheat and melt the consumable. It continues to melt through the nozzle flow channel, flows out, and then cooperates with the continuous movement of the print head to achieve the printing function.

[0003] The traditional printer nozzle uses an M6 thread. Its flow channel hole diameter is 2 mm, and the flow channel depth is about 6 mm. The heat is provided by the contact between the inner wall of the entire flow channel and the consumable to melt the consumable. The printing efficiency has always been low. How to improve the printing efficiency under the condition that all other factors remain unchanged (such as the external shape of the nozzle remains unchanged, that is, the diameter of the M6 thread remains unchanged, the external shape of the heating block remains unchanged, and the heat efficiency provided by the heating rod remains unchanged) is an urgent problem to be solved at present. Summary of the Invention

[0004] To solve the deficiencies of the prior art, the present application provides a 3D printer nozzle, including a nozzle body. A through flow channel is opened in the nozzle body. A plug core is arranged in the nozzle body. The plug core includes a sleeve. A plurality of guide plates are arranged circumferentially along the inner wall of the sleeve. Adjacent two of the guide plates are arranged at a preset interval distance. Each guide plate has a plurality of guide surfaces. The plurality of guide plates are simultaneously arranged around the flow channel.

[0005] Further, the guide plates include four groups and are arranged in a spiral structure.

[0006] Further, the guide plates have a first spiral part and a second spiral part from top to bottom. The free ends of the first spiral part and the second spiral part are respectively arranged in a cross-shaped structure.

[0007] Further, the guide plate has a first guide plane, a second guide plane and a third guide arc surface. Among them, the first guide plane and the second guide plane are arranged oppositely. The third guide arc surface is arranged close to the flow channel.

[0008] Further, an installation groove is opened inward from the end of the nozzle body. The plug core is arranged in the installation groove and is attached to the inner wall of the installation groove.

[0009] Further, the guide plate and the sleeve are integrally formed.

[0010] As another aspect of the present application, a 3D printing head is also provided, which includes the 3D printer nozzle described above.

[0011] The advantage of the present application is that: by setting the plug core in the provided 3D printer nozzle, the contact area between the inside of the nozzle and the consumable is increased, the flow time of the consumable in the nozzle is prolonged, the melting amount of the consumable per unit time is increased, and thus the extrusion speed is increased, achieving the purpose of increasing the flow rate and improving the printing efficiency. Description of the Drawings

[0012] Figure 1 It is a schematic structural diagram of an embodiment of the 3D printer nozzle of the present application; Figure 2 It is a schematic assembly diagram of the plug core and the nozzle body; Figure 3 It is Figure 2 a schematic structural diagram of the middle guide plate in Figure 4 It is Figure 3 a schematic structural diagram of the middle guide plate from another perspective; Figure 5 It is Figure 3 a schematic structural diagram of a single guide plate in Figure 6 It is a schematic structural diagram of another embodiment of the guide plate; Figure 7 It is a schematic structural diagram of a 3D printer; Figure 8 It is Figure 7 an explosion schematic diagram.

[0013] In the figure, the markings are: 10, nozzle body; 101, flow channel; 102, mounting groove; 11, plug core; 111, sleeve; 112, guide plate; 113, first spiral part; 114, second spiral part; 115, first guide plane; 116, second guide plane; 117, third guide arc surface; 13, throat tube; 14, thermistor; 15, thermistor fixing screw; 16, heating rod; 17, heating block; 18, heating rod fixing screw; 19, nozzle. Detailed Embodiments

[0014] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0015] It should be noted that in the description and claims of this application and the above-mentioned drawings, terms such as "first" and "second" are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances for the embodiments of this application described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that comprises a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0016] In this application, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe this application and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation or be constructed and operated in a specific orientation.

[0017] Moreover, in addition to being able to represent an orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0018] In addition, the terms "installed", "set", "provided with", "connected", "coupled", "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can also be internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0019] It should be noted that, without conflict, the embodiments and features in the embodiments of this application can be combined with each other. The following will detail this application with reference to the drawings and in combination with embodiments. Embodiment

[0020] See Figures 1 - 5, this embodiment provides a large-flow nozzle for a 3D printer, which includes a nozzle body 10. The nozzle body 10 adopts a commonly used V6 nozzle in 3D printers. An M6 thread is tapped at its upper end for threaded connection with the heating block of the print head. A through-flow channel 101 is opened inside the nozzle. The printing consumable melts from the upper end and then flows out from the flow channel of the nozzle.

[0021] In order to increase the contact area between the inside of the nozzle and the consumable and extend the flow time of the consumable in the nozzle, a counterbore with a depth of 6 mm and a diameter of 4 mm is milled at the upper end of the nozzle body 10 as an installation groove 102. A plug core 11 is arranged in the installation groove 102. After the plug core 11 is embedded, its end does not protrude outside the nozzle body. The plug core 11 includes a sleeve 111. Four guide plates 112 are arranged circumferentially along the inner wall of the sleeve 111. Adjacent two guide plates 112 are arranged at a preset interval distance. A through-flow channel is still reserved at the central position of the whole plug core and is communicated with the flow channel of the lower nozzle body.

[0022] Preferably, the four guide plates 112 are all arranged in a spiral structure. Each guide plate has a first spiral part 113 and a second spiral part 114 from top to bottom. The first spiral part 113 and the second spiral part 114 can be an integrally formed structure or a segmented structure. The radian size of its spiral surface can be set according to actual needs to meet the requirement of increasing the area of the whole spiral surface. The guide plate 112 and the sleeve 111 are integrally formed. The preparation process of the whole plug core adopts powder metallurgy technology.

[0023] For a traditional nozzle with a flow channel hole diameter of 2 mm and a flow channel depth of 6 mm, the contact area between the inner wall of the flow channel and the consumable is: S1 = 2πr * 6, so the contact area S1 = 37.68 square millimeters. Next, calculate the contact area between the consumable and the inner wall of the nozzle after embedding the plug core: S2 = 2πR * 6 + 4 * the side area of the spiral guide plate. The side area of a single guide plate is 14.3 square millimeters. S2 = 56.52 + 4 * 14.3, that is, S2 = 128.32 square millimeters. It can be seen that after using the flow-increasing plug core, the contact area between the nozzle and the consumable increases to 3 times that of the traditional nozzle and the consumable, so that the melting amount of the consumable can be increased per unit time, the consumable can be melted faster, so as to be extruded through the flow channel faster, thus increasing the extrusion speed and achieving the purpose of increasing the flow rate and improving the printing efficiency. Embodiment

[0024] See Figure 6, this embodiment provides a large-flow nozzle for a 3D printer. The main structure of the nozzle is the same as that in Embodiment 1. The plug core also includes a sleeve. The difference lies in the structure of the feed guide plate. In Embodiment 1, it is a spiral structure. In this embodiment, there are also four feed guide plates, and a vertically penetrating flow channel is also left in the middle. Each single feed guide plate is generally in a cuboid structure, specifically including a first feed guide plane 115, a second feed guide plane 116, and a third feed guide arc surface 117. Among them, the first feed guide plane 115 and the second feed guide plane 116 are oppositely arranged, and the third feed guide arc surface 117 is the side close to the flow channel. Of course, the structure of the above feed guide plate can also adopt an upper and lower segmented type, and an integral structure is preferred. Embodiment

[0025] See Figure 7 , this embodiment provides a print head for a 3D printer, including a throat tube 13, a thermistor 14, a thermistor fixing screw 15, a heating rod 16, a heating block 17, a heating rod fixing screw 18, and a nozzle 19. M6 threads are tapped at both the upper and lower ends of the throat tube 13. The thermistor 14 is used to detect the temperature. The thermistor fixing screw 15 uses the flange of the screw head to restrict the thermistor from slipping out, playing a role in fixing the thermistor. The heating rod 16 generally uses 24V, and common specifications include 50W, 70W, etc. to heat the heating block. The nozzle 19 adopts the nozzle structure in Embodiment 1 or 2.

[0026] During installation, first screw the lower end of the throat tube into the heating block through the M6 thread, and then screw the nozzle into the lower end of the heating block through the M6 thread. The screwing depth is based on the lower end of the relief groove of the nozzle M6 being about 1 millimeter away from the lower end of the heating block. At this time, tighten the throat tube and the nozzle. Since the throat tube is screwed from top to bottom and the nozzle is screwed from bottom to top, when the lower end surface of the throat tube touches the upper end surface of the nozzle, during the tightening process, the two planes fit tightly to achieve the effect of sealing the flow channel and prevent the melted consumable 12 from flowing out and causing leakage. Then, insert the heating rod and use the heating rod fixing screw to screw into the heating block to make the heating block hold the heating rod tightly. So that after the heating rod is powered on, heat can be provided to the heating block through close contact. Then install the thermistor and use the thermistor fixing screw to screw into the heating block to restrict the thermistor from sliding, playing a fixing role.

[0027] After powering on the heating rod, heat the heating block. At this time, feed the consumable 12. Heat the consumable when it enters the lower end of the throat tube (the part screwed into the heating block), so that the consumable is preheated and melted, continues to melt through the flow channel of the nozzle, and flows out. Cooperate with the continuous movement of the print head to achieve the printing function.

[0028] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A 3D printer nozzle, comprising a nozzle body, wherein a flow channel is provided through the nozzle body, wherein: A plug core is arranged in the nozzle body, and the plug core includes a sleeve. A plurality of material guide plates are arranged circumferentially along the inner wall of the sleeve. Two adjacent material guide plates are arranged at a preset spacing distance. Each material guide plate has a plurality of material guide surfaces. The plurality of material guide plates are arranged around the flow channel at the same time.

2. A 3D printer nozzle according to claim 1, characterized in that: The material guide plates include four groups and are arranged in a spiral structure.

3. A 3D printer nozzle according to claim 2, characterized in that: The material guide plate has a first spiral portion and a second spiral portion from top to bottom, and the free ends of the first spiral portion and the second spiral portion are respectively arranged in a cross-shaped structure.

4. A 3D printer nozzle according to claim 1, characterized in that: The material guide plate has a first material guide plane, a second material guide plane and a third material guide cambered surface, wherein the first material guide plane and the second material guide plane are arranged opposite to each other, and the third material guide cambered surface is arranged close to the flow channel.

5. A 3D printer nozzle according to claim 1, characterized in that: An installation groove is provided inwardly along the end of the nozzle body, and the plug core is arranged in the installation groove and is closely attached to the inner wall of the installation groove.

6. A 3D printer nozzle according to claim 3 or 4, characterized in that: The guide plate and the sleeve are integrally formed.

7. A 3D printing head, characterized in that: Comprising a 3D printer nozzle as described in any one of claims 1-6.

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