Pin shaft positioning printing head
By introducing a pin positioning structure and line contact design into the 3D print head, the problems of structural stability and heat conduction are solved, more efficient heat dissipation and more stable print head connection are achieved, and printing quality is improved.
Patent Information
- Application Number
- CN202422443743.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-09
- Publication Date
- 2025-09-12
- Estimated Expiration
- 2034-10-09
AI Technical Summary
Existing 3D printing heads have difficulty balancing structural stability and heat conduction, resulting in poor printing quality.
A pin positioning structure is adopted. By setting multiple positioning holes on the heating block and using pins to connect with the flange, combined with bent springs and thermistors for fixation, a stable connection between the heating block and the radiator is achieved, and heat conduction is reduced through line contact.
The structural stability and heat dissipation efficiency of the print head are improved, the heat conduction from the heating block to the radiator is reduced, and the printing quality is improved.
Smart Images
Figure CN223326955U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of 3D printing, in particular to a pin-positioning print head. Background Art
[0002] At present, 3D printing technology is widely used. The print head, as the core equipment of printing, is generally composed of structures such as a radiator, a throat, a heating block and a nozzle. It has a relatively high degree of integration, and the connection and fixation between its components in a small range are very particular. At the same time, a certain distance needs to be maintained between the radiator and the heating block to isolate the conduction of heat. Therefore, the print head must consider both structural stability and heat conduction technology. However, existing print heads often cannot achieve the above goals well. Utility Model Content
[0003] In order to address the deficiencies of the prior art, the present application provides a pin-positioned print head, comprising a throat, a radiator, a heating block and a nozzle, wherein a material channel is opened in the heating block, the throat is connected to the material channel from one end of the heating block, and the nozzle is connected to the material channel from the other end of the heating block, the radiator is arranged on the outside of the heating block near one end of the throat, a plurality of positioning holes are opened circumferentially on the heating block, a pin is arranged in the positioning hole, the pin extends out of the positioning hole, a flange is provided on the outside of the heating block, and the flange is connected to the radiator by a positioning screw, wherein the outer wall of the heating block does not contact the flange, and the pin abuts against the flange.
[0004] Furthermore, the heating block is a heating block with a rectangular cross-section, and a ceramic heating plate is provided on one side of the heating block.
[0005] Furthermore, the positioning holes are respectively opened on the other three side surfaces of the heating block.
[0006] Furthermore, a bent spring sheet is provided on the outer side of the ceramic heating sheet, and the bent spring sheet surrounds the heating block.
[0007] Furthermore, a protruding pressing piece is provided on the inner side of the bent spring piece, and the protruding pressing piece abuts against the ceramic heating piece.
[0008] Furthermore, a thermistor is provided between the heating block and the bent spring piece.
[0009] Furthermore, the pin is a cylindrical pin.
[0010] Furthermore, a rectangular support hole is provided on the flange, and the diameter of the pin shaft is larger than the width of the support hole, so as to cooperate with the pin shaft to form a line contact between the two.
[0011] Furthermore, a cooling fan is provided on the outside of the radiator to further dissipate heat from the radiator.
[0012] Furthermore, a silicone insulation sleeve is provided on the outer side of the flange and the lower end of the heating block to prevent heat loss under the heating block and improve the melting effect of the material.
[0013] The benefit of the present application lies in that the provided pin-positioned print head can provide constraints in multiple directions within the plane by setting pins in different directions, thereby ensuring the stable connection between the radiator and the heating block. At the same time, the pin and the flange are in line contact, which can reduce the contact area between the heating block and the flange, thereby reducing the heat transfer from the hot melt end of the lower material to the heat dissipation end above, thereby improving the printing quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a schematic structural diagram of an embodiment of the pin-positioning print head of this application;
[0015] Figure 2 for Figure 1 Schematic diagram of the internal structure;
[0016] Figure 3 This is a schematic diagram of the pin-positioned print head for this application;
[0017] Figure 4 for Figure 3 Schematic diagram of the middle flange structure;
[0018] Figure 5 for Figure 3 Schematic diagram of the center-bending spring structure.
[0019] Marked in the figure: 10, throat, 11, radiator, 12, heating block, 121, material channel, 13, nozzle, 14, pin, 15, flange, 151, mounting hole, 152, support hole, 16, ceramic heating plate, 17, bent spring, 171, protruding pressing plate, 172, arc groove, 18, thermistor, 19, fan cover, 20, cooling fan, 21, silicone insulation sleeve. DETAILED DESCRIPTION
[0020] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.
[0021] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.
[0022] In this application, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "center," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe this application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.
[0023] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.
[0024] Furthermore, the terms "installed," "disposed," "provided with," "connected," "connected," and "socketed" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.
[0025] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0026] See also Figure 1-Figure 5, this embodiment provides a pin-positioned print head, including a throat 10, a radiator 11, a heating block 12 and a nozzle 13. A material channel 121 is opened in the heating block 12, the throat 10 extends into the material channel 121 from the upper end of the heating block, and the nozzle 13 is connected to the material channel from the bottom end of the heating block. The radiator 11 is arranged on the outer side of the upper end of the heating block 12, and the throat is covered at the same time. Of course, a channel is opened at the upper end of the radiator for connecting the throat, and a plurality of positioning holes are opened circumferentially on the heating block 12, and a pin 14 is arranged in the positioning hole. The pin 14 extends out of the positioning hole, and a flange 15 is provided on the outer side of the heating block. Three groups of mounting holes 151 are opened circumferentially on the flange 15, and a positioning screw 152 is arranged in the mounting hole 151. The upper end of the positioning screw 152 is connected to the bottom end of the radiator 11, wherein the outer wall of the heating block 12 does not contact the flange 15, and the pin 14 abuts against the flange 15.
[0027] Specifically, the heating block is a heating block with a rectangular cross-section, that is, the heating block 12 is arranged in a rectangular parallelepiped structure as a whole, and an inward-concave mounting groove is opened on one of the side surfaces. A ceramic heating plate 16 is arranged in the mounting groove for heating the heating block. In order to fix the ceramic heating plate 16, a bent spring piece 17 is arranged on its periphery. In this embodiment, the length of the heating block is relatively long, so two groups of bent spring pieces 17 are arranged above and below to press the ceramic heating plate 16 tightly toward the heating block.
[0028] Preferably, the bent spring piece 17 is constructed as an annular structure, and a protruding pressing piece 171 is provided on one side thereof. The protruding pressing piece 171 abuts against the ceramic heating piece to better press the ceramic heating piece. The protruding pressing piece 171 is a V-shaped structure, one end of which is connected to the bent spring piece, and the other end is a free end that does not contact the spring piece.
[0029] Since the radiator and the heating block are fixed by the flange 15, in order to reduce the heat at the bottom of the heating block from being finally conducted to the radiator through the pin, flange and positioning screw, the pin 14 is constructed as a cylindrical structure, and positioning holes are opened on the other three sets of side surfaces of the heating block 12 to provide constraints from different directions. A support hole 152 corresponding to the position of the pin is opened on the flange 15 to support the pin. The support hole 152 is a rectangular hole, and its width is about 2 mm smaller than the diameter of the pin, so that line contact can be achieved between the two, reducing the contact area. At the same time, the end of the pin does not contact the flange. When the flange 15 is tightened toward the radiator by the positioning screw 152, the support hole applies force to the pin, thereby achieving stable assembly of the print head.
[0030] In order to monitor the heating temperature of the heating block 12 in real time, a mounting hole is provided in the heating block for mounting the thermistor 18 , and an arc-shaped groove 172 is provided on the bent spring piece 17 for passing and fixing the wiring harness of the thermistor 18 .
[0031] In order to better dissipate heat, the radiator 11 has multiple cooling fins. A fan cover 19 is provided on one side of the radiator 11, and a cooling fan 20 is provided in the fan cover 19. In addition, a silicone insulation cover 21 is provided on the outside of the flange 15 and the outside of the heating block below the flange.
[0032] During installation, first press three pins 14 with a diameter of 2 mm and a length of 5 mm into the positioning holes of the heating block 12. Then, put the flange 15 on the heating block 12 and move it to the top of the heating block. Then, evenly apply thermal grease to the mounting groove of the heating block and the mounting hole for installing the thermistor. Press the ceramic heating plate 16 tightly into the mounting groove coated with thermal grease on the heating block, and insert the thermistor 18 into the mounting hole of the heating block. At this time, put the bent spring 17 on the lower end of the heating block. It will press the ceramic heating plate 16 tightly against the heating block and bend the cable of the thermistor 18 to fix the thermistor 4 in the heating block. Next, use three positioning screws 152 (M1.4x8 titanium screws) to pass through the mounting holes 151 of the flange and screw them into the screw holes at the bottom of the radiator 11. Tighten them to tighten the heating block and radiator so that they are firmly connected. Then use two M2.5x12 screws to fasten the cooling fan 20 to the radiator 11, screw the nozzle 13 into the bottom of the heating block, and finally put on the silicone insulation cover 21 to complete the installation.
[0033] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. A pin-positioned print head, comprising a throat, a heat sink, a heating block, and a nozzle. The heating block defines a material channel, the throat connects to the material channel from one end of the heating block, and the nozzle connects to the material channel from the other end of the heating block. The heat sink is disposed outside the heating block near one end of the throat, and is characterized in that: A plurality of positioning holes are provided on the circumference of the heating block, and a pin is provided in the positioning hole. The pin extends out of the positioning hole, and a flange is provided on the outside of the heating block. The flange is connected to the radiator through a positioning screw, wherein the outer wall of the heating block does not contact the flange, and the pin abuts against the flange.
2. The pin-positioning print head according to claim 1, characterized in that: The heating block is a heating block with a rectangular cross section, and a ceramic heating plate is provided on one side of the heating block.
3. The pin-positioning print head according to claim 2, characterized in that: The positioning holes are respectively provided on the other three side surfaces of the heating block.
4. The pin-positioning print head according to claim 2, characterized in that: A bent spring sheet is arranged on the outer side of the ceramic heating sheet, and the bent spring sheet surrounds the heating block.
5. The pin-positioning print head according to claim 4, characterized in that: A protruding pressing piece is provided on the inner side of the bent spring piece, and the protruding pressing piece abuts against the ceramic heating piece.
6. The pin-positioning print head according to claim 4, characterized in that: A thermistor is arranged between the heating block and the bent elastic piece.
7. The pin-positioning print head according to claim 1, characterized in that: The pin is a cylindrical pin.
8. The pin-positioning print head according to claim 7, characterized in that: A rectangular supporting hole is provided on the flange, and the diameter of the pin shaft is greater than the width of the supporting hole.
9. The pin-positioning print head according to claim 1, characterized in that: A cooling fan is arranged on the outside of the radiator.
10. The pin-positioning print head according to claim 1, characterized in that: The outer side of the flange and the lower end of the heating block are covered with a silicone insulation sleeve.