Material extrusion feed structure for a 3D printer

Abstract

The present application relates to the technical field of printer feeding, in particular to a material extrusion feeding structure of a 3D printer, which comprises an adjusting mechanism connected with the printer, the adjusting mechanism is provided with a print head shell for feeding material, and the print head shell is provided with a feeding port for the material to enter; the material is extruded by an extrusion mechanism and sent into a feeding mechanism, heated and melted and straightened by the feeding mechanism, so that the material can be conveniently extruded and fed by falling, that is, after the material is continuously moved downward by being extruded by a material roller one and a material roller two, the material enters a heating tube, at this time, the heating tube is powered to heat the material, so that the material is heated to become a molten material, then the material continuously moves downward into a straightening pipe, when the material is in the straightening pipe, the material is straightened and vertically moved downward, during the period when the material enters the straightening pipe, a gear ring is driven to rotate by a motor one, so that the straightening pipe rotates, a rotating relative displacement is formed between the straightening pipe and the material, so as to prevent the material from being stuck in the straightening pipe and causing blockage, and the material can be continuously moved downward.

Description

Technical Field

[0001] This invention relates to the field of printer feeding technology, specifically a material extrusion feeding structure for a 3D printer. Background Technology

[0002] 3D printing uses different "printing materials" such as metal, ceramics, plastics, and sand, which are real raw materials. After the printer is connected to a computer, the computer can control the "printing materials" to be stacked layer by layer, and finally turn the blueprint on the computer into a physical object. The design process of 3D printing is as follows: first, a model is created using computer modeling software, and then the built 3D model is "divided" into layers of cross sections, i.e., slices, to guide the printer to print layer by layer.

[0003] 3D printers heat filaments into a molten state using a print head. The molten material is then extruded onto a printing platform as the print head moves, gradually layering to form a physical object. During the extrusion and feeding process, the material inside the print head can easily stick and become clogged. Poor cooling within the print head also contributes to this clog. Furthermore, dust contamination on the material's surface before it enters the print head can cause uneven heating and negatively impact the final print. Summary of the Invention

[0004] To address the problems in the prior art, the present invention provides a material extrusion feeding structure for a 3D printer.

[0005] The technical solution adopted by this invention to solve its technical problem is: a material extrusion feeding structure for a 3D printer, including an adjustment mechanism connected to the printer, a print head housing for feeding material into the adjustment mechanism, a feed inlet for material entry into the print head housing, a cooling fan installed in the print head housing, a scraping mechanism for cleaning linear material installed inside the print head housing, an extrusion mechanism for extruding the cleaned material inside the print head housing, a dust guiding mechanism for collecting dust inside the print head housing, the dust guiding mechanism being connected to the extrusion mechanism, a feeding mechanism for ejecting material fixed at the lower end of the print head housing, and a cooling mechanism for cooling the material inside the feeding mechanism.

[0006] Specifically, the adjustment mechanism includes a fixed base, a bracket fixedly mounted vertically at the lower end of the fixed base, a second ball screw rotatably connected to the bracket, a sliding seat threadedly connected to the second ball screw, a first ball screw rotatably connected to the sliding seat and a slide rod fixedly connected to the sliding seat, the printhead housing slidably connected to the slide rod, and the printhead housing threadedly connected to the first ball screw.

[0007] Specifically, the dust scraping mechanism includes a support frame, the left end of which is fixed to the upper end of the inner surface of the printhead housing, the right end of which is rotatably connected to a dust scraping wheel, the upper end of the inner surface of the printhead housing is slidably connected to a movable frame, the lower end of which is rotatably connected to a cleaning wheel, the upper end of which is fixed to the printhead housing with a spring, and the material is clamped between the dust scraping wheel and the cleaning wheel. The dust scraping wheel and the cleaning wheel have an I-shaped structure.

[0008] Specifically, the extrusion mechanism includes a material roller 1 and a material roller 2 rotatably connected inside the printhead housing. A motor 2 is fixedly installed on the outer surface of the printhead housing. The output shaft of the motor 2 is fixedly connected to the rotation point of the material roller 1. The rotation points of the material roller 1 and the material roller 2 are each fixed with mutually meshing gears. The inner sides of the material roller 1 and the material roller 2 are provided with arc-shaped extrusion grooves, and the material is clamped between the two extrusion grooves.

[0009] Specifically, the dust guiding mechanism includes a rotating shaft fixed inside the printhead housing. The rotating shaft is rotatably connected to a guide plate inclined inside the printhead housing. One end of the guide plate has a movable groove through which the material passes. A connecting rod is rotatably connected to the lower surface of the guide plate. The lower end of the connecting rod is rotatably connected to the outer surface of the first material roller. An arc-shaped dust-proof frame is fixed to the lower end of the guide plate. The left side of the first material roller is located inside the dust-proof frame.

[0010] Specifically, the feeding mechanism includes a material shell, which is fixed to the lower end of the printhead housing. A nozzle is fixed to the lower end of the material shell. The material passes through the material shell and extends out of the lower end of the nozzle. A straightening tube is rotatably connected to the upper end of the nozzle. A heating tube is fixedly connected to the upper end of the material shell. The material passes through the heating tube and the straightening tube. A motor is fixedly installed inside the nozzle. A rack ring is fixed to the outer surface of the lower end of the straightening tube. The lower end of the output shaft of the motor is meshed with the rack ring. A lead screw is rotatably connected to the right side of the material shell. A fan blade is fixed to the lead screw. A heat dissipation mesh is fixedly connected to the right side of the material shell.

[0011] Specifically, the cooling mechanism includes a water tank, which is fixed to the lower end of the inner wall of the material shell. A water pump is fixed to the lower end of the material shell. A heat dissipation pipe located outside the material shell is directly fixed to the water pump and the lower end of the water tank. A reciprocating screw is sleeved and fixed to the outer wall of the straightening pipe. A ball sleeve is threaded to the reciprocating screw. The right side of the ball sleeve is threaded to the screw. A circulation pipe arranged in an annular shape is fixed inside the ball sleeve. A water outlet pipe is fixed to the inlet of the circulation pipe. The water outlet pipe is fixed to the outlet of the water pump. A water inlet pipe is fixed to the outlet of the circulation pipe. One end of the water inlet pipe is fixed to and communicates with the upper inner wall of the water tank.

[0012] The beneficial effects of this invention are:

[0013] (1) The material extrusion feeding structure of the 3D printer described in this invention first cleans the material by scraping the dust with a dust scraping mechanism to avoid uneven material due to dust adhering to the material when it is heated and melted, which would affect the printing. That is, the linear material enters the inside of the print head housing through the feed port, and then passes between the dust scraping wheel and the dust cleaning wheel to continue to move downward. During the downward movement of the material, the dust scraping wheel and the dust cleaning wheel are driven to rotate. During the rotation, the dust scraping wheel and the dust cleaning wheel adhere to the dust on the outer surface of the material, and the material is first cleaned to prevent dust from adhering to the material before extrusion and affecting the printing. During the downward movement of the material, the spring can push the dust cleaning wheel to squeeze the material and clamp the material. The movable frame can adapt to the displacement that occurs during the movement of the material, so that the material moves smoothly until it enters the next stage.

[0014] (2) The material extrusion feeding structure of the 3D printer described in this invention uses a dust guiding mechanism to receive the dust scraped off the material, preventing the dust from sticking to the extrusion mechanism. During the material extrusion feeding process, the dust guiding mechanism reciprocates and vibrates to accelerate dust collection. Specifically, when the material enters between material roller one and material roller two and contacts the extrusion groove, the friction between the material and the roller increases. At this time, motor two starts, driving material roller one to rotate. Under the action of gears, material roller two rotates, extruding the material downwards and feeding it. This allows the material to continuously move downwards, and the dust scraper... During the dust removal process, the dust falling from the cleaning roller is collected by the guide plate. Then, the dust rolls down to the left on the inclined guide plate until it rolls off the outer surface of the left side of the dustproof frame and falls into the lower part of the print head housing. During the dust rolling process, the dustproof frame can effectively prevent the dust from falling onto the outer surface of the material roller and coming into contact with the material again. In addition, during the material roller's rotation and extrusion process, it drives the connecting rod to move. Under the action of the upper end of the connecting rod, the guide plate is driven to swing back and forth in a small amplitude around the pivot point, which helps to quickly shake off the dust on the guide plate and facilitates the continued collection of dust for material cleaning.

[0015] (3) The material extrusion feeding structure of the 3D printer described in this invention is such that the material is extruded and fed into the feeding mechanism by the extrusion mechanism, and is heated and melted by the feeding mechanism and straightened to facilitate the material falling and extruding for feeding. That is, after the material is continuously extruded and moved downward by the material roller one and the material roller two, the material enters the heating tube. At this time, the heating tube is energized to heat the material, so that the material is heated and becomes molten. Then the material continues to move downward into the straightening tube. When the material is in the straightening tube, the material becomes straight and moves vertically downward. During the period when the material enters the straightening tube, the rack ring is driven to rotate by the operation of the motor one, so that the straightening tube rotates and a rotational relative displacement is formed between the straightening tube and the material, which prevents the material from sticking inside the straightening tube and causing blockage, and facilitates the continuous downward movement of the material.

[0016] (4) The material extrusion feeding structure of the 3D printer described in this invention has a cooling mechanism that works in conjunction with the feeding mechanism. Water circulates within the cooling mechanism, absorbing heat from the feeding mechanism to cool it down and prevent material blockage. Specifically, the heat in the straight tube is absorbed and exchanged with the outside through the heat dissipation pipe, thus cooling the straight tube and preventing excessive melting of the material that may block it. The inlet and outlet pipes are flexible hoses that can bend and deform as the ball sleeve moves up and down. During the process of the straight tube rotating to straighten the material, the reciprocating screw rotates, thereby driving the ball sleeve to move up and down and the circulation pipe to move up and down along the straight tube to absorb heat from the straight tube and achieve good cooling of the straight tube. Finally, the molten material is ejected through the nozzle and fed onto the printing platform of the printer until it is printed. During the process of the ball sleeve moving up and down, the screw rotates, driving the fan blades to rotate and agitate the airflow inside the material shell. The hot air is discharged through the heat dissipation mesh, which cools the straight tube in the material shell better and prevents material blockage of the straight tube. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 A schematic diagram of the overall structure of a preferred embodiment of a material extrusion feeding structure for a 3D printer provided by the present invention;

[0019] Figure 2 This is a schematic diagram of the planar structure of the present invention;

[0020] Figure 3 This is a schematic diagram of the adjustment mechanism, printhead housing, and material of the present invention;

[0021] Figure 4 This is a schematic diagram of the printhead housing and adjustment mechanism of the present invention;

[0022] Figure 5 This is a schematic cross-sectional view of the printhead housing of the present invention;

[0023] Figure 6 For the present invention Figure 5 The enlarged schematic diagram of part A shown below;

[0024] Figure 7 For the present invention Figure 5 The enlarged schematic diagram of section B is shown below;

[0025] Figure 8 This is a schematic diagram of the structure of the printhead housing and extrusion mechanism of the present invention.

[0026] In the diagram: 1. Printhead housing; 101. Cooling fan; 102. Feed inlet; 2. Adjustment mechanism; 21. Fixed base; 22. Bracket; 23. Ball screw one; 24. Slide bar; 25. Ball screw two; 26. Sliding seat; 3. Feeding mechanism; 31. Material shell; 32. Nozzle; 33. Heat dissipation mesh; 34. Heating tube; 35. Straightening tube; 36. Rack and pinion ring; 37. Motor one; 38. Lead screw; 39. Fan blade; 4. Material; 5. Dust scraping mechanism; 51. Support frame; 52. 53. Dust scraper; 54. Dust cleaning wheel; 55. Movable frame; 66. Spring; 77. Extrusion mechanism; 88. Material roller one; 99. Material roller two; 100. Motor two; 11. Gear; 12. Extrusion trough; 13. Dust guiding mechanism; 14. Dust prevention frame; 15. Guide plate; 16. Connecting rod; 17. Rotating shaft; 18. Movable groove; 19. Cooling mechanism; 10. Heat dissipation pipe; 11. Water pump; 12. Water tank; 13. Water inlet pipe; 14. Water outlet pipe; 15. Ball bearing sleeve; 16. Reciprocating screw; 17. Circulation pipe. Detailed Implementation

[0027] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0028] like Figures 1-6 As shown, a material extrusion feeding structure for a 3D printer according to the present invention includes an adjustment mechanism 2 connected to the printer. The adjustment mechanism 2 is equipped with a printhead housing 1 for feeding material 4. The printhead housing 1 is provided with a feed port 102 for material 4 to enter. The printhead housing 1 is equipped with a cooling fan 101. A scraping mechanism 5 for cleaning the linear material 4 is installed inside the printhead housing 1. An extrusion mechanism 6 for extruding the cleaned material 4 is installed inside the printhead housing 1. A dust guiding mechanism 7 for receiving dust is provided inside the printhead housing 1. The dust guiding mechanism 7 is connected to the extrusion mechanism 6. A feeding mechanism 3 for ejecting material is fixed at the lower end of the printhead housing 1. A cooling mechanism 8 for cooling the material 4 is installed inside the feeding mechanism 3.

[0029] Specifically, the adjustment mechanism 2 includes a fixed base 21, with a bracket 22 fixed vertically at the lower end of the fixed base 21. The bracket 22 is rotatably connected to a second ball screw 25, and the second ball screw 25 is threadedly connected to a sliding seat 26. The sliding seat 26 is rotatably connected to a first ball screw 23 arranged horizontally and a fixedly connected slide rod 24. The print head housing 1 is slidably connected to the slide rod 24, and the print head housing 1 is threadedly connected to the first ball screw 23. The bracket 22 is installed on the 3D printer. The first ball screw 23 and the second ball screw 25 are driven to rotate by a motor (not shown in the figure) to control the vertical and horizontal movement of the sliding seat 26 and the print head housing 1, which is suitable for the movement of the print head in 3D printing.

[0030] Specifically, the scraping mechanism 5 includes a support frame 51. The left end of the support frame 51 is fixed to the upper end of the inner surface of the printhead housing 1, and the right end of the support frame 51 is rotatably connected to a scraping wheel 52. A movable frame 54 is slidably connected to the upper end of the inner surface of the printhead housing 1, and a cleaning wheel 53 is rotatably connected to the lower end of the movable frame 54. A spring 55 is fixed between the upper end of the movable frame 54 and the printhead housing 1. The material 4 is clamped between the scraping wheel 52 and the cleaning wheel 53. The scraping wheel 52 and the cleaning wheel 53 have an I-shaped structure. The linear material 4 enters the interior of the printhead housing 1 through the feed inlet 102, and then... As the material 4 continues to move downwards, passing between the scraper wheel 52 and the cleaning wheel 53, it drives the scraper wheel 52 and the cleaning wheel 53 to rotate. During the rotation, the scraper wheel 52 and the cleaning wheel 53 pick up dust from the outer surface of the material 4, thus cleaning the material 4 first to prevent dust from affecting printing before the material 4 is extruded. During the downward movement of the material 4, the spring 55 can push the cleaning wheel 53 to squeeze and clamp the material 4. The movable frame 54 can adapt to the displacement that occurs during the movement of the material 4, so that the material 4 moves smoothly until it enters the next stage.

[0031] Specifically, the extrusion mechanism 6 includes a first material roller 61 and a second material roller 62 rotatably connected inside the printhead housing 1. A second motor 63 is fixedly installed on the outer surface of the printhead housing 1. The output shaft of the second motor 63 is fixedly connected to the rotation point of the first material roller 61. The rotation points of the first material roller 61 and the second material roller 62 are both fixed with mutually meshing gears 64. The inner sides of the first material roller 61 and the second material roller 62 are provided with arc-shaped extrusion grooves 65. The material 4 is clamped between the two extrusion grooves 65. After the material is scraped down by the scraper wheel 52 and the cleaning wheel 53, it enters the space between the first material roller 61 and the second material roller 62 and contacts the extrusion grooves 65, which can increase the friction between the material 4 and the material. At this time, the second motor 63 starts, drives the first material roller 61 to rotate, and under the action of the gears 64, the second material roller 62 rotates, extruding the material 4 downward and feeding it, so that the material 4 continues to move downward.

[0032] Specifically, the dust guiding mechanism 7 includes a rotating shaft 74, which is fixed inside the printhead housing 1. The rotating shaft 74 is rotatably connected to a guide plate 72 inclined inside the printhead housing 1. One end of the guide plate 72 has a movable groove 75 through which the material 4 passes. A connecting rod 73 is rotatably connected to the lower surface of the guide plate 72, and the lower end of the connecting rod 73 is rotatably connected to the outer surface of the material roller 61. An arc-shaped dust-proof frame 71 is fixed to the lower end of the guide plate 72, and the left side of the material roller 61 is located inside the dust-proof frame 71. During the dust removal process of the scraper wheel 52 and the cleaning wheel 53, the falling dust is cleaned up. Dust is collected by guide plate 72, and then rolls down to the left on the inclined guide plate 72 until it rolls off the outer left side of dustproof frame 71 and into the lower end of the print head housing 1. During the dust rolling process, dustproof frame 71 can effectively prevent dust from falling onto the outer surface of material roller 61 and contacting the material 4 again. During the rotation and extrusion of material roller 61, it drives connecting rod 73 to move. Under the action of the upper end of connecting rod 73, guide plate 72 is driven to swing back and forth in a small amplitude around pivot 74, which helps to quickly shake off the dust on guide plate 72 and facilitates the continued collection of dust to clean the material 4.

[0033] Specifically, the feeding mechanism 3 includes a material shell 31, which is fixed to the lower end of the print head housing 1. A nozzle 32 is fixed to the lower end of the material shell 31. The material 4 passes through the material shell 31 and extends out of the lower end of the nozzle 32. A straightening tube 35 is rotatably connected to the upper end of the nozzle 32. A heating tube 34 is fixedly connected to the upper end of the material shell 31. The material 4 passes through the heating tube 34 and the straightening tube 35. A motor 37 is fixedly installed inside the nozzle 32. A rack ring 36 is fixed to the outer surface of the lower end of the straightening tube 35. The lower end of the output shaft of the motor 37 is meshed with the rack ring 36. A lead screw 38 is rotatably connected to the right side of the material shell 31. A fan blade 39 is fixed to the lead screw 38. A heat dissipation mesh 33 is fixed through the right side of the shell 31. After the material 4 is squeezed and continuously moved downward by the first material roller 61 and the second material roller 62, the material 4 enters the heating tube 34. At this time, the heating tube 34 is energized to heat the material 4, so that the material 4 is heated and becomes molten. Then the material 4 continues to move downward into the straightening tube 35. When the material 4 is in the straightening tube 35, the material 4 becomes straight and moves vertically downward. During the period when the material 4 enters the straightening tube 35, the first motor 37 drives the rack ring 36 to rotate, so that the straightening tube 35 rotates, so that the straightening tube 35 and the material 4 form a rotational relative displacement, preventing the material 4 from sticking to the inside of the straightening tube 35 and causing blockage, which is conducive to the continuous downward movement of the material 4.

[0034] Specifically, the cooling mechanism 8 includes a water tank 83, which is fixed to the lower end of the inner wall of the material shell 31. A water pump 82 is fixed to the lower end of the material shell 31. A heat dissipation pipe 81 located outside the material shell 31 is directly fixed to the lower end of the water pump 82 and the water tank 83. A reciprocating screw 87 is sleeved and fixed to the outer wall of the straight pipe 35. A ball sleeve 86 is threadedly connected to the reciprocating screw 87. The right side of the ball sleeve 86 is threadedly connected to the screw 38. A circulation pipe 88 arranged in an annular shape is fixed inside the ball sleeve 86. A water outlet pipe 85 is fixed to the inlet of the circulation pipe 88. Pipe 85 is fixed to the outlet of water pump 82, and the outlet of circulation pipe 88 is fixed with inlet pipe 84. One end of inlet pipe 84 is fixed to and connected to the upper inner wall of water tank 83. When material 4 moves down, is heated to a molten state by heating pipe 34, and enters straightening pipe 35, water in water tank 83 is drawn from heat dissipation pipe 81 by water pump 82. Then, it is sent through outlet pipe 85 into circulation pipe 88 inside ball sleeve 86, so that water flows inside circulation pipe 88. Then, water enters water tank 83 through inlet pipe 84, and then flows through heat dissipation pipe 84 into water tank 83. The water is fed into the heat pipe 81 by the water pump 82. As the water flows within the heat pipe 81, it exchanges heat with the outside environment, thus circulating the water. This process absorbs heat from the straightening tube 35 and discharges it to the outside environment through the heat pipe 81, cooling the straightening tube 35 and preventing the material 4 from excessively melting and clogging inside. The inlet pipe 84 and outlet pipe 85 are flexible hoses that can bend and deform with the ball sleeve 86 as it moves up and down. During the rotation of the straightening tube 35 to straighten the material 4, the reciprocating screw 87 rotates along with it, thereby driving the ball sleeve 86 up and down. The movement of the ball sleeve 86 causes the circulation pipe 88 to move up and down along the straight pipe 35, absorbing the heat of the straight pipe 35 and achieving good cooling of the straight pipe 35. Finally, the molten material is ejected through the nozzle 32 and fed onto the printing platform of the printer until it is printed. During the up and down movement of the ball sleeve 86, the drive screw 38 rotates, which drives the fan blade 39 to rotate, stirring the airflow inside the material shell 31. The hot air is discharged through the heat dissipation mesh 33, which makes the straight pipe 35 inside the material shell 31 cool down better and prevents the material 4 from clogging the straight pipe 35.

[0035] When using this invention, firstly, the operator puts the linear material 4 into the inside of the print head housing 1 through the feed port 102, and then it continues to move down between the scraper wheel 52 and the cleaning wheel 53. During the downward movement of the material 4, the scraper wheel 52 and the cleaning wheel 53 are driven to rotate. During the rotation, the scraper wheel 52 and the cleaning wheel 53 stick to the dust on the outer surface of the material 4, and the material 4 is cleaned first to prevent the material 4 from being affected by dust before it is extruded.

[0036] Then the material enters between the first material roller 61 and the second material roller 62 and comes into contact with the extrusion groove 65, which can increase the friction between the material 4 and the material. At this time, the second motor 63 starts and drives the first material roller 61 to rotate. Under the action of the gear 64, the second material roller 62 rotates and extrudes the material 4 downward, so that the material 4 continues to move downward.

[0037] Next, material 4 enters heating tube 34. At this time, heating tube 34 is energized and heats material 4, causing material 4 to become molten. Then, material 4 continues to move down into straightening tube 35. While in straightening tube 35, material 4 becomes straight and moves vertically downward. During the period when material 4 enters straightening tube 35, motor 37 drives rack ring 36 to rotate, causing straightening tube 35 to rotate. This creates a rotational relative displacement between straightening tube 35 and material 4, preventing material 4 from sticking to the inside of straightening tube 35 and causing blockage, and facilitating the continuous downward movement of material 4.

[0038] Finally, water from the water tank 83 is drawn into the heat dissipation pipe 81 by the water pump 82, and then sent to the circulation pipe 88 inside the ball sleeve 86 through the outlet pipe 85. The water flows within the circulation pipe 88, then enters the water tank 83 through the inlet pipe 84, and is then sent to the water pump 82 through the heat dissipation pipe 81. During its flow within the heat dissipation pipe 81, the water exchanges heat with the outside environment, thus circulating the water. This process absorbs heat from the straight pipe 35 and exchanges it with the outside environment through the heat dissipation pipe 81, cooling the straight pipe 35 and preventing material overflow. The molten material is trapped inside the straightening tube 35. The inlet pipe 84 and outlet pipe 85 are flexible hoses that can bend and deform as the ball sleeve 86 moves up and down. During the process of the straightening tube 35 rotating to straighten the material 4, it drives the reciprocating screw 87 to rotate together, thereby driving the ball sleeve 86 to move up and down, and driving the circulation pipe 88 to move up and down along the straightening tube 35 to absorb the heat of the straightening tube 35 and achieve good cooling of the straightening tube 35. Finally, the molten material is ejected through the nozzle 32 for feeding and spraying onto the printing platform of the printer until it is printed.

[0039] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0040] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A material extrusion feeding structure for a 3D printer, characterized in that, The device includes an adjustment mechanism (2) connected to the printer, which is equipped with a printhead housing (1) for feeding material (4). The printhead housing (1) has a feed inlet (102) for the material (4) to enter. The printhead housing (1) is equipped with a cooling fan (101). The printhead housing (1) has a scraping mechanism (5) for cleaning the linear material (4) installed inside. The printhead housing (1) has an extrusion mechanism (6) for extruding the cleaned material (4) inside. The printhead housing (1) has a dust guiding mechanism (7) for collecting dust inside. The dust guiding mechanism (7) is connected to the extrusion mechanism (6). The lower end of the printhead housing (1) is fixed with a feeding mechanism (3) for ejecting material. The feeding mechanism (3) is equipped with a cooling mechanism (8) for cooling the material (4); the dust guiding mechanism (7) includes a rotating shaft (74), which is fixed inside the print head housing (1). The rotating shaft (74) is rotatably connected to a guide plate (72) that is inclined inside the print head housing (1). One end of the guide plate (72) is provided with a movable groove (75). The material (4) passes through the movable groove (75). The lower surface of the guide plate (72) is rotatably connected to a connecting rod (73). The lower end of the connecting rod (73) is rotatably connected to the outer surface of the first material roller (61). The lower end of the guide plate (72) is fixed with an arc-shaped dustproof frame (71). The left side of the first material roller (61) is located inside the dustproof frame (71).

2. The material extrusion feeding structure for a 3D printer according to claim 1, characterized in that: The adjustment mechanism (2) includes a fixed seat (21), a bracket (22) is fixedly arranged vertically at the lower end of the fixed seat (21), a ball screw (25) is rotatably connected to the bracket (22), a sliding seat (26) is threadedly connected to the ball screw (25), a ball screw (23) is rotatably connected to the sliding seat (26), a ball screw (23) is arranged horizontally and a slide rod (24) is fixedly connected, the print head housing (1) is slidably connected to the slide rod (24), and the print head housing (1) is threadedly connected to the ball screw (23).

3. The material extrusion feeding structure for a 3D printer according to claim 2, characterized in that: The scraping mechanism (5) includes a support frame (51). The left end of the support frame (51) is fixed to the upper end of the inner surface of the printhead housing (1). The right end of the support frame (51) is rotatably connected to a scraping wheel (52). The upper end of the inner surface of the printhead housing (1) is slidably connected to a movable frame (54). The lower end of the movable frame (54) is rotatably connected to a cleaning wheel (53). The upper end of the movable frame (54) is fixed to a spring (55) between it and the printhead housing (1). The material (4) is clamped between the scraping wheel (52) and the cleaning wheel (53). The scraping wheel (52) and the cleaning wheel (53) are I-shaped structures.

4. The material extrusion feeding structure for a 3D printer according to claim 3, characterized in that: The extrusion mechanism (6) includes a material roller 1 (61) and a material roller 2 (62) rotatably connected inside the printhead housing (1). A motor 2 (63) is fixedly installed on the outer surface of the printhead housing (1). The output shaft of the motor 2 (63) is fixedly connected to the rotation point of the material roller 1 (61). The rotation points of the material roller 1 (61) and the material roller 2 (62) are both fixed with gears (64) that mesh with each other. The inner sides of the material roller 1 (61) and the material roller 2 (62) are provided with arc-shaped extrusion grooves (65). The material (4) is clamped between the two extrusion grooves (65).

5. The material extrusion feeding structure for a 3D printer according to claim 1, characterized in that: The feeding mechanism (3) includes a material shell (31), which is fixed to the lower end of the print head housing (1). A nozzle (32) is fixed to the lower end of the material shell (31). The material (4) passes through the material shell (31) and extends out of the lower end of the nozzle (32). A straight tube (35) is rotatably connected to the upper end of the nozzle (32). A heating tube (34) is fixed through the upper end of the material shell (31). The material (4) passes through the heating tube (34) and the straight tube (35). A motor (37) is fixedly installed inside the nozzle (32). A rack ring (36) is fixed to the outer surface of the lower end of the straight tube (35). The lower end of the output shaft of the motor (37) is meshed with the rack ring (36). A lead screw (38) is rotatably connected to the right side of the material shell (31). A fan blade (39) is fixed to the lead screw (38). A heat dissipation mesh (33) is fixed through the right side of the material shell (31).

6. The material extrusion feeding structure for a 3D printer according to claim 5, characterized in that: The cooling mechanism (8) includes a water tank (83), which is fixed to the lower end of the inner wall of the shell (31). A water pump (82) is fixed to the lower end of the shell (31). A heat dissipation pipe (81) located outside the shell (31) is directly fixed to the lower end of the water pump (82) and the water tank (83). A reciprocating screw (87) is sleeved and fixed to the outer wall of the straight pipe (35). A ball bearing sleeve (86) is threaded onto the reciprocating screw (87). The ball sleeve (86) is threaded to the right side of the lead screw (38). A ring-shaped circulation pipe (88) is fixed inside the ball sleeve (86). A water outlet pipe (85) is fixed at the inlet of the circulation pipe (88). The water outlet pipe (85) is fixed to the outlet of the water pump (82). A water inlet pipe (84) is fixed at the outlet of the circulation pipe (88). One end of the water inlet pipe (84) is fixed to and connected to the upper inner wall of the water tank (83).

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