Printing head for 3D printer

Abstract

The printing head for the 3D printer comprises a radiator, a throat pipe, a heating block and a nozzle, one end of the throat pipe is connected with the radiator, a through channel is formed in the heating block, the other end of the throat pipe extends into the channel of the heating block, the nozzle is connected to the channel at the other end of the heating block, and the nozzle is connected with the radiator. The radiator is connected with the heating block through a height limiting screw so that a gap can be formed between the radiator and the heating block, a mounting hole is formed in the radiator, the upper end of the throat pipe is arranged in the mounting hole, the throat pipe is sleeved with a spring, one end of the spring abuts against the heating block, and the other end of the spring abuts against the heating block. And the other end is abutted against the upper part of the throat pipe, so that the throat pipe is attached to the inner wall of the radiator. The spring is arranged on the throat pipe, the upper portion of the throat pipe and the radiator are pressed tightly, and the heat dissipation effect is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of 3D printing, in particular to a print head for a 3D printer. Background Art

[0002] At present, 3D printing technology is widely used. As the core device of the printer, the print head generally consists of structures such as a radiator, a throat heating block, and a nozzle. The upper and lower ends of the throat are respectively connected to the radiator and the heating block. The upper end of the throat is cooled by the radiator. In the existing print head, the contact between the throat and the radiator is not tight and the contact surface is not large, which affects the heat dissipation effect. At the same time, a certain distance needs to be maintained between the radiator and the heating block to isolate the heat conduction. Content of the Utility Model

[0003] To solve the deficiencies of the existing technology, the present application provides a print head for a 3D printer, which includes a radiator, a throat, a heating block, and a nozzle. One end of the throat is connected to the radiator. A through channel is opened on the heating block. The other end of the throat extends into the channel of the heating block. The nozzle is connected to the channel at the other end of the heating block. The radiator and the heating block are connected by height-limiting screws so that a gap is formed between the radiator and the heating block. An installation hole is opened inside the radiator. The upper end of the throat is arranged in the installation hole. A spring is sleeved on the throat. One end of the spring abuts against the heating block, and the other end abuts against the upper part of the throat so that the throat is arranged in a fitting manner with the inner wall of the radiator.

[0004] Further, the throat includes a connecting part and a heat-receiving part. The connecting part is a frustum structure that abuts against the installation hole of the radiator. The heat-receiving part is a capillary tube that extends into the channel of the heating block.

[0005] Further, the heating block includes a heating part and a supporting part. The supporting part has a plurality of supporting bosses. The height-limiting screws are connected to the radiator through the supporting bosses.

[0006] Further, both ends of the spring respectively abut against the connecting part of the frustum structure and the supporting part.

[0007] Further, the height-limiting screw includes a main body part and a tightening part. The tightening part has an external thread for threaded connection with the radiator. A limiting boss is arranged on the main body part.

[0008] Further, an internal threaded hole is opened in the main body part. The height-limiting screw is tightened to the supporting boss through a tightening screw.

[0009] Further, a ceramic heating sheet is arranged on the outer side of the heating block through a fixed buckle.

[0010] Further, an installation groove is formed in an outer wall of the heating block close to the ceramic heating sheet, and a thermistor is arranged in the installation groove.

[0011] Further, the print head for a 3D printer further includes a wire harness fixing piece and a binding strap, and the binding strap is used for binding the wire harnesses of the ceramic heating sheet and the thermistor on the wire harness fixing piece.

[0012] The beneficial effect of the present application is that: by arranging a spring in the throat tube, the upper part of the throat tube is pressed tightly against the radiator, enhancing the heat dissipation effect, in the print head for a 3D printer provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of an embodiment of a print head for a 3D printer according to the present application;

[0014] Figure 2 is Figure 1 an exploded view of the print head for a 3D printer in

[0015] Figure 3 is Figure 2 a schematic structural diagram of the height-limiting screw in

[0016] Figure 4 is Figure 3 a cross-sectional view;

[0017] Figure 5 is Figure 2 a schematic structural diagram of the heating block in

[0018] In the figure, the labels are: 10, radiator; 11, throat tube; 111, connecting part; 112, heated part; 12, heating block; 121, heating part; 122, supporting part; 123, supporting boss; 124, installation groove; 125, clamping groove; 13, nozzle; 14, spring; 15, height-limiting screw; 151, main body part; 152, tightening part; 153, limiting boss; 154, internal thread hole; 16, tightening screw; 17, ceramic heating sheet; 18, fixing buckle; 19, thermistor; 20, wire harness fixing piece; 21, binding strap. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] 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 with reference to the accompanying 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 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.

[0020] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of this application are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so as to implement the embodiments of this application described here. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes 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.

[0021] In this application, the orientation or positional relationship indicated by the terms "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 device, element or component must have a specific orientation, or be constructed and operated in a specific orientation.

[0022] Moreover, in addition to being able to represent the 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.

[0023] In addition, the terms "install", "set", "provide", "connect", "be connected", "be sleeved" 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.

[0024] 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 refer to the drawings and combine with the embodiments to detail this application.

[0025] See Figures 1-5, this embodiment provides a print head for a 3D printer, which includes a radiator 10, a throat tube 11, a heating block 12, and a nozzle 13. The upper end of the throat tube 11 is connected to the radiator. A vertically penetrating channel is opened on the heating block 12. The lower end of the throat tube extends into the channel of the heating block 12. The nozzle 13 is threadedly connected to the channel at the bottom end of the heating block. The radiator 10 and the heating block 12 are connected by a height-limiting screw 15 to form a gap between the radiator and the heating block. An installation hole is opened inside the radiator. The upper end of the throat tube 11 is arranged in the installation hole. A spring 14 is sleeved on the throat tube. One end of the spring abuts against the heating block, and the other end abuts against the upper part of the throat tube so that the throat tube is arranged in fit with the inner wall of the radiator.

[0026] Specifically, the throat tube 11 is a brass throat tube, which includes a connecting part 111 and a heat-receiving part 112. The connecting part is a frustum structure. The installation hole of the radiator 10 is also an inclined hole with the same taper. A through hole is also opened at the top end of the radiator to communicate with the throat tube as a feeding channel. The heat-receiving part 112 is a capillary tube that extends into the channel of the heating block.

[0027] In order to increase the heat dissipation effect of the radiator on the throat tube, the fitting degree between the connecting part 111 and the inner wall of the radiator is required. A spring 14 is sleeved on the heat-receiving part. The heating block 12 includes a heating part 121 and a supporting part 122. The supporting part 122 has a plurality of supporting bosses 123. The height-limiting screw 15 is connected to the radiator through the supporting bosses. The upper and lower ends of the spring 14 respectively abut against the connecting part with a frustum structure and the supporting part 122.

[0028] More specifically, the supporting bosses 123 are arranged in a triangle. The height-limiting screw 15 includes a main body part 151 and a tightening part 152. The tightening part 152 has an external thread. Three groups of threaded holes are opened at the bottom of the radiator 10, and then tightened through the external thread of the tightening part. A limiting boss 153 is arranged on the main body part 151 for abutting against the bottom wall of the radiator.

[0029] In order to achieve the effect of height limitation, a stepped hole is opened on the supporting boss 123. The bottom of the main body part 151 is installed in the stepped hole. A tightening screw 16 is arranged from below the supporting boss 123. An internal threaded hole 154 is opened in the main body part 151. The tightening screw 16 is screwed into the threaded hole 154. While fixing the radiator and the heating block, the effect of height limitation is achieved.

[0030] Specifically, the heating block 12 is configured as a cuboid structure. Of course, it can also be a cylindrical or conical structure, etc. An installation groove 124 is formed on one side wall of the heating block 13, and a thermistor 19 is arranged in the installation groove 124 for detecting the temperature of the print head. At the same time, a ceramic heating sheet 17 capable of covering the side wall is arranged on the outer side of the side wall. A plurality of card slots 125 are formed on the two side walls adjacent to the side wall, and the ceramic heating sheet 17 is fixed by fixing buckles 18 fixed in the card slots 125. Thermal conductive silicone grease is applied to the contact surfaces between the ceramic heating sheet and the side wall of the heating block to increase surface contact and thus better transfer heat.

[0031] Since there are wire harnesses for both the ceramic heating sheet 17 and the thermistor 19, these wire harnesses are fixed by wire harness fixing pieces 20 arranged on the heating block, and at the same time, high-temperature resistant nylon tie straps 21 are used for tying and fixing.

[0032] During operation, the ceramic heating sheet 17 is powered on to heat, providing a heat source for the heating block 12 to melt the material, and it is extruded through the nozzle 13 to achieve printing. The heat generated during the heating process is conducted to the radiator through the conical surface of the throat pipe in contact with the radiator, and then blown by an external cooling fan for heat dissipation. During the process, the printing temperature is monitored and adjusted by the thermistor 19 to determine whether to increase or decrease the temperature.

[0033] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded 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 print head for a 3D printer, comprising a radiator, a throat, a heating block and a nozzle, wherein one end of the throat is connected to the radiator, a through channel is provided on the heating block, the other end of the throat extends into the channel of the heating block, and the nozzle is connected to the channel at the other end of the heating block, characterized in that: The radiator and the heating block are connected by a height limiting screw to form a gap between the radiator and the heating block. A mounting hole is provided inside the radiator. The upper end of the throat is arranged in the mounting hole. A spring is sleeved on the throat. One end of the spring abuts against the heating block, and the other end abuts against the upper part of the throat so that the throat is fitted against the inner wall of the radiator.

2. A print head for a 3D printer according to claim 1, characterized in that: The throat comprises a connecting portion and a heat receiving portion, wherein the connecting portion is a frustum structure abutting against the mounting hole of the heat sink, and the heat receiving portion is a capillary extending into a channel of the heating block.

3. A print head for a 3D printer according to claim 2, characterized in that: The heating block comprises a heating portion and a supporting portion, wherein the supporting portion has a plurality of supporting bosses, and the height-limiting screw is connected to the heat sink via the supporting bosses.

4. A print head for a 3D printer according to claim 3, characterized in that: Two ends of the spring are respectively in contact with the connecting portion of the frustum structure and the supporting portion.

5. A print head for a 3D printer according to claim 3, characterized in that: The height-limiting screw comprises a main body and a tightening part. The tightening part is provided with an external thread for being threadedly connected with the radiator. The main body is provided with a limiting boss.

6. A print head for a 3D printer according to claim 5, characterized in that: An internal threaded hole is provided in the main body, and the height limiting screw is tightened to the supporting boss by tightening the screw in the internal threaded hole.

7. A print head for a 3D printer according to claim 1, characterized in that: A ceramic heating plate is arranged on the outer side of the heating block via a fixing buckle.

8. A print head for a 3D printer according to claim 7, characterized in that: An installation groove is provided on the outer wall of the heating block close to the ceramic heating plate, and a thermistor is arranged in the installation groove.

9. A print head for a 3D printer according to claim 8, characterized in that: The print head for the 3D printer further comprises a wire harness fixing plate and a binding belt, wherein the binding belt is used to bind the wire harnesses of the ceramic heating plate and the thermistor onto the wire harness fixing plate.

Images