Extrusion structure for use in a 3D printer print head
By designing a transparent cover and limiting structure in the extrusion mechanism of the 3D printer printhead, the problems of material blockage and inconvenient disassembly and assembly of the extrusion mechanism are solved, and the convenience of fault diagnosis and maintenance is realized.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG FEIXIONG 3D TECH CO LTD
- Filing Date
- 2025-06-27
- Publication Date
- 2026-05-29
AI Technical Summary
The extrusion mechanism of the 3D printer print head is prone to material blockage after prolonged use, and disassembly and assembly are inconvenient, making fault diagnosis and repair difficult.
Design an extrusion structure including a transparent cover, which is detachably connected to a retainer. The transparent cover and retainer are provided with shaft holes. The pressure rod and gear are limited by a pivot pin and a rotating shaft. A spring drives the gear to mesh, and a motor drives the drive gear, so as to realize direct observation of the internal structure and easy disassembly and assembly.
The transparent cover allows for direct observation of the internal workings of the extrusion mechanism, facilitating fault diagnosis and simplifying the disassembly, assembly, and maintenance of the extrusion structure.
Smart Images
Figure CN224296601U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of 3D printer accessories, specifically relating to an extrusion structure used in the print head of a 3D printer. Background Technology
[0002] 3D printers, also known as three-dimensional printers, are rapid prototyping devices. 3D printing technology is widely used in various industries. Common 3D printer consumables include materials such as ABS. The consumable is transported through an extrusion mechanism inside the print head, heated to a molten state by a heater, and then extruded through nozzles on the print head onto the work platform for printing.
[0003] The extrusion mechanism inside the printhead, which is used to transport printing consumables, contains internal structures such as feeding gears. During prolonged use, problems such as material blockage may occur inside the extrusion mechanism. In this case, the extrusion mechanism needs to be inspected. The cover plate on the extrusion mechanism needs to be removed to observe the inside of the extrusion mechanism and thus diagnose the fault. Furthermore, the feeding gears and other structures inside the extrusion mechanism are not connected to the cover plate. The feeding gears and other structures use a separate installation structure, which makes disassembly and assembly more cumbersome. This makes fault diagnosis and disassembly and assembly very inconvenient and not conducive to maintenance. Summary of the Invention
[0004] To address the aforementioned drawbacks, this invention provides an extrusion structure for use in the print head of a 3D printer. This extrusion mechanism is equipped with a separate transparent cover, which allows direct observation of the internal structure and can also be used for limiting the installation of various internal gears and other structures, thereby making it more convenient to repair the extrusion structure after a malfunction.
[0005] The purpose of this invention is achieved through the following technical solution: an extrusion structure for a 3D printer printhead, including a retainer, the retainer having an installation groove and a transparent cover covering the installation groove, the transparent cover and the retainer being detachably connected, and the transparent cover and the retainer each having a plurality of shaft holes that correspond to each other.
[0006] The mounting slot houses a pressure rod, a first feeding gear, and a combination gear. The first feeding gear is rotatably mounted on the pressure rod. A pivot pin is fitted onto the pressure rod, allowing the pressure rod to rotate around the center line of the pivot pin. One end of the pressure rod extends to the outside of the retainer. The combination gear includes a rotating shaft, and the gear rotates around the center line of this rotating shaft. The pivot pin and the rotating shaft are respectively inserted into the shaft holes on the transparent cover and the retainer, and the retainer and the transparent cover cooperate to axially limit the pivot pin on the pressure rod. A spring is also provided between the pressure rod and the retainer to drive the pressure rod to rotate, causing the first feeding gear to mesh with the combination gear.
[0007] The cage is also equipped with a motor, and a drive gear that meshes with the combined gear is fixed on the motor shaft.
[0008] Preferably, the combined gear includes a transmission gear and a second feeding gear fixedly mounted on a rotating shaft. The transmission gear meshes with the drive gear, and the second feeding gear meshes with the first feeding gear.
[0009] Preferably, the tip circle diameter of the transmission gear is larger than the tip circle diameter of the second feeding gear.
[0010] Preferably, the retainer includes a main frame, on which a first fixing frame, a second fixing frame, and a mounting frame are fixedly mounted. A gear groove is provided between the first fixing frame and the second fixing frame, and the side of the gear groove communicates with the side of the retainer. The gear groove includes an upper groove and a lower groove, with the lower groove located at the bottom of the upper groove and its width greater than that of the upper groove. The first feeding gear and the second feeding gear are located in the upper groove, and the transmission gear is located in the lower groove. A pressure rod groove is provided between the mounting frame and the first fixing frame, and the pressure rod is installed in the pressure rod groove and can rotate around the pivot pin in the pressure rod groove. The spring is disposed between the mounting frame and the pressure rod. The gear groove and the pressure rod groove combine to form the mounting groove. The shaft hole on the retainer is located on the main frame. The transparent cover covers the first fixing frame, the second fixing frame, and the mounting frame.
[0011] Preferably, the first fixing frame is provided with a groove, in which an air connector for printing consumables to pass through is embedded. The first fixing frame is detachably provided with a cover plate for pressing the air connector onto the first fixing frame. Both the first fixing frame and the second fixing frame are provided with through holes for printing consumables to pass through, and the through holes are aligned with the inner hole of the air connector.
[0012] Preferably, the transparent cover is connected and fixed to the first fixing frame, the second fixing frame and the mounting frame by bolts; the cover plate is also detachably fixed to the first fixing frame by bolts.
[0013] Preferably, the mounting bracket is also provided with adjusting bolts for limiting the rotation angle of the pressure rod.
[0014] Preferably, the mounting bracket has a groove, in which a fixing block is embedded, and an adjusting bolt that cooperates with the pressure rod is screwed onto the fixing block, and the spring is sleeved on the adjusting bolt.
[0015] Preferably, the transparent cover is fixedly provided with a limiting block that fits onto the adjusting bolt and radially limits the adjusting bolt.
[0016] Preferably, both the first and second feeding gears are made of metal.
[0017] Compared with the prior art, the present invention has the following beneficial effects:
[0018] 1. In this application, by setting a separate transparent cover, the internal condition of the extrusion mechanism can be directly observed, which facilitates the diagnosis of faults;
[0019] 2. In this application, the transparent cover and the retainer cooperate with each other to limit and position the installation of the pressure rod, the first feeding gear, and the combined gear. This allows the pressure rod, the first feeding gear, the combined gear, and other structures to be directly removed after the transparent cover is removed, making the disassembly and assembly of the internal structure of the extrusion structure simpler and facilitating the maintenance of the extrusion structure. Attached Figure Description
[0020] Figure 1 This is a perspective view of the present utility model;
[0021] Figure 2 This is a perspective view of the present invention after the transparent cover has been removed;
[0022] Figure 3 for Figure 2 3D view after removing the cover plate;
[0023] Figure 4 This is a schematic diagram of the connection structure between the pressure rod, the first feeding gear, the combined gear, the drive gear, and the motor.
[0024] Figure 5 A 3D view of the transparent cover;
[0025] The markings in the diagram are: 1. Cage, 2. Mounting slot, 3. Transparent cover, 4. Shaft hole, 5. Pressure rod, 6. First feeding gear, 7. Combined gear, 8. Turning pin, 9. Rotating shaft, 10. Transmission gear, 11. Second feeding gear, 12. Spring, 13. Motor, 14. Drive gear, 15. Main frame, 16. First fixing frame, 17. Second fixing frame, 18. Mounting frame, 20. Upper slot, 21. Lower slot, 22. Pressure rod slot, 23. Groove, 24. Air connector, 25. Cover plate, 26. Positioning slot, 27. Positioning block, 28. Adjusting bolt, 29. Embedded groove, 30. Fixing block, 31. Limiting block. Detailed Implementation
[0026] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings:
[0027] Example 1
[0028] like Figures 1-5As shown, an extrusion structure for a 3D printer printhead includes a retainer 1, a mounting groove 2 on the retainer 1 and a transparent cover 3 covering the mounting groove 2, the transparent cover 3 and the retainer 1 are detachably connected, and the transparent cover 3 and the retainer 1 are respectively provided with a plurality of shaft holes 4, the shaft holes 4 on the transparent cover 3 and the shaft holes 4 on the retainer 1 correspond one-to-one;
[0029] The mounting groove 2 houses a pressure rod 5, a first feeding gear 6, and a combination gear 7. The first feeding gear 6 is rotatably mounted on the pressure rod 5. A pivot pin 8 is fitted onto the pressure rod 5, allowing the pressure rod 5 to rotate around the center line of the pivot pin 8. One end of the pressure rod 5 extends to the outside of the retainer 1. The combination gear 7 includes a rotating shaft 9, a transmission gear 10 fixedly mounted on the rotating shaft 9, and a second feeding gear 11. The tip circle diameter of the transmission gear 10 is larger than that of the second feeding gear 11. Seven wheels rotate around the center line of the rotating shaft 9. The two ends of the pivot pin 8 and the rotating shaft 9 are respectively inserted into the shaft holes 4 on the transparent cover 3 and the retainer 1, and the retainer 1 and the transparent cover 3 cooperate to axially limit the pressure rod 5 by the pivot pin 8. A spring 12 is also provided between the pressure rod 5 and the retainer 1 to drive the pressure rod 5 to rotate so that the first feeding gear 6 meshes with the second feeding gear 11. A motor 13 is also fixed on the retainer 1, and a drive gear 14 that meshes with the transmission gear 10 is fixed on the rotating shaft of the motor 13. The first feeding gear 6 and the second feeding gear 11 are both made of metal.
[0030] The retainer 1 includes a main frame 15, on which a first fixing frame 16, a second fixing frame 17, and a mounting frame 18 are fixedly mounted. A gear groove is provided between the first fixing frame 16 and the second fixing frame 17, and the side of the gear groove communicates with the side of the retainer 1. The gear groove includes an upper groove 20 and a lower groove 21, with the lower groove 21 located at the bottom of the upper groove 20 and its width greater than that of the upper groove 20. The first feeding gear 6 and the second feeding gear 11 are located in the upper groove 20, and the transmission gear 10 is located in the lower groove 21. A pressure rod groove 22 is provided between the mounting frame 18 and the first fixing frame 16. The pressure rod 5 is installed in the pressure rod groove 22 and can rotate around the pivot pin 8 in the pressure rod groove 22. The spring 12 is provided between the mounting frame 18 and the pressure rod 5. The gear groove and the pressure rod groove 22 combine to form the mounting groove 2. The shaft hole 4 on the retainer 1 is located on the main frame.
[0031] The first mounting bracket 16 has a groove 23, into which an air connector 24 for printing consumables to pass through is embedded. A cover plate 25 is detachably mounted on the first mounting bracket 16 to press the air connector 24 against it. The side of the air connector 24 also has a positioning groove 26 with an annular structure arranged around its centerline. Both the cover plate 25 and the first mounting bracket 16 have positioning blocks 27 that can be embedded into the positioning groove 26. Positioning and installation of the air connector 24 are achieved by embedding the positioning blocks 27 into the positioning groove 26, and then the cover plate 25 is used to press and fix it, making the assembly and disassembly of the air connector 24 very simple and facilitating its maintenance. Both the first mounting bracket 16 and the second mounting bracket 17 have through holes for printing consumables to pass through, and these through holes are aligned with the inner hole of the air connector 24.
[0032] The transparent cover 3 covers the first fixing frame 16, the second fixing frame 17 and the mounting frame 18. The transparent cover 3 is connected and fixed to the first fixing frame 16, the second fixing frame 17 and the mounting frame 18 by bolts. The cover plate 25 is also detachably fixed to the first fixing frame 16 by bolts.
[0033] The mounting bracket 18 is also provided with an adjusting bolt 28 for limiting the rotation angle of the pressure rod 5. The mounting bracket 18 has a groove 29, in which a fixing block 30 is embedded. The fixing block 30 has a screw hole. The adjusting bolt 28 is screwed into the screw hole and passes through the screw hole to cooperate with the pressure rod 5. The spring 12 is sleeved on the outside of the adjusting bolt 28. The transparent cover 3 is also fixed with a limiting block 31 that fits against the adjusting bolt 28 and radially limits the adjustment bolt 28. Under the elastic action of spring 12, pressure rod 5 rotates toward the side where the combined gear 7 is located, thereby causing the first feeding gear 6 and the second feeding gear 11 on the combined gear 7 to mesh. The first feeding gear 6 and the second feeding gear 11 work together to achieve the extrusion and delivery of printing consumables. At this time, there is a certain gap between the end of adjusting bolt 28 toward pressure rod 5 and pressure rod 5. By rotating adjusting bolt 28, the gap between the end of adjusting bolt 28 and pressure rod 5 can be adjusted. Manually turning pressure rod 5 toward adjusting bolt 28 can drive the first feeding gear 6 and the second feeding gear 11 to separate.
[0034] If the printhead using the technical solution of this application fails to extrude consumables smoothly during use, the internal condition of the extrusion structure can be directly observed through the transparent cover 3 to determine the cause of the malfunction, which is very convenient. When it is necessary to disassemble the extrusion structure, simply loosen the bolts on the transparent cover 3 and remove the transparent cover 3 from the first fixing frame 16, the second fixing frame 17 and the mounting frame 18. Since the two ends of the pivot pin 8 on the pressure rod 5 and the rotating shaft 9 in the combined gear 7 are respectively inserted into the shaft holes 4 on the transparent cover 3 and the retainer 1, and the retainer 1 and the transparent cover 3 cooperate to axially limit the pivot pin 8 of the pressure rod 5, the pressure rod 5 and the combined gear 7 can be directly removed. When it is necessary to reassemble, simply reverse the operation. Disassembly and assembly are very convenient, which makes the maintenance and disassembly of the extrusion structure more convenient.
[0035] It should be understood that in the claims and description of this utility model, all instances of "comprising..." should be understood as having an open meaning, that is, their meaning is equivalent to "containing at least...", and should not be understood as having a closed meaning, that is, their meaning should not be understood as "containing only...".
[0036] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.
Claims
1. An extrusion structure for use in a 3D printer printhead, comprising a retainer, characterized in that, The cage is provided with a mounting groove and a transparent cover covering the mounting groove. The transparent cover and the cage are detachably connected. The transparent cover and the cage are respectively provided with a number of shaft holes that correspond to each other. The mounting slot houses a pressure rod, a first feeding gear, and a combination gear. The first feeding gear is rotatably mounted on the pressure rod. A pivot pin is fitted onto the pressure rod, allowing the pressure rod to rotate around the center line of the pivot pin. One end of the pressure rod extends to the outside of the retainer. The combination gear includes a rotating shaft, and the gear rotates around the center line of this rotating shaft. The pivot pin and the rotating shaft are respectively inserted into the shaft holes on the transparent cover and the retainer, and the retainer and the transparent cover cooperate to axially limit the pivot pin on the pressure rod. A spring is also provided between the pressure rod and the retainer to drive the pressure rod to rotate, causing the first feeding gear to mesh with the combination gear. The cage is also equipped with a motor, and a drive gear that meshes with the combined gear is fixed on the motor shaft.
2. The extrusion structure for a 3D printer printhead according to claim 1, characterized in that, The combined gear includes a transmission gear and a second feeding gear fixedly mounted on a rotating shaft. The transmission gear meshes with the drive gear, and the second feeding gear can mesh with the first feeding gear.
3. The extrusion structure for a 3D printer printhead according to claim 2, characterized in that, The tip circle diameter of the transmission gear is larger than that of the tip circle diameter of the second feeding gear.
4. The extrusion structure for a 3D printer printhead according to claim 3, characterized in that, The retainer includes a main frame, on which a first fixing frame, a second fixing frame, and a mounting frame are fixedly mounted. A gear groove is provided between the first fixing frame and the second fixing frame. The side of the gear groove communicates with the side of the retainer. The gear groove includes an upper groove and a lower groove. The lower groove is located at the bottom of the upper groove and the width of the lower groove is greater than the width of the upper groove. The first and second feeding gears are located in the upper groove, and the transmission gear is located in the lower groove; a pressure rod groove is provided between the mounting frame and the first fixed frame, the pressure rod is installed in the pressure rod groove and can rotate around the pivot pin in the pressure rod groove, the spring is provided between the mounting frame and the pressure rod, and the gear groove and the pressure rod groove are combined to form the mounting groove; the shaft hole on the retainer is located on the main frame; the transparent cover covers the first fixed frame, the second fixed frame and the mounting frame.
5. An extrusion structure for a 3D printer printhead according to claim 4, characterized in that, The first fixing frame is provided with a groove, in which an air connector for printing consumables to pass through is embedded. The first fixing frame is detachably provided with a cover plate for pressing the air connector onto the first fixing frame. Both the first fixing frame and the second fixing frame are provided with through holes for printing consumables to pass through, and the through holes are aligned with the inner hole of the air connector.
6. An extrusion structure for a 3D printer printhead according to claim 5, characterized in that, The transparent cover is connected and fixed to the first fixing frame, the second fixing frame and the mounting frame by bolts; the cover plate is also detachably fixed to the first fixing frame by bolts.
7. An extrusion structure for a 3D printer printhead according to claim 4, characterized in that, The mounting bracket is also equipped with adjusting bolts for limiting the rotation angle of the pressure rod.
8. An extrusion structure for a 3D printer printhead according to claim 7, characterized in that, The mounting bracket has a groove, in which a fixing block is embedded. The fixing block is screwed with an adjusting bolt that cooperates with the pressure rod, and the spring is sleeved on the outside of the adjusting bolt.
9. An extrusion structure for a 3D printer printhead according to claim 8, characterized in that, The transparent cover is fixedly provided with a limiting block that fits onto the adjusting bolt and radially limits the adjusting bolt.
10. An extrusion structure for a 3D printer printhead according to any one of claims 2-9, characterized in that, Both the first and second feeding gears are made of metal.