Extrusion device for 3D printer consumables

Abstract

This invention relates to the field of plastic extrusion equipment technology, and discloses an extrusion device for 3D printer consumables, including a frame, a screw extruder, a die head, a feeding assembly, a cooling water tank, a diameter gauge, and a winding rack. A fixed frame is arranged on the frame and above the die head, and a fume hood is arranged on the fixed frame. A fume inlet pipe is arranged on the side wall of the suction box, and a fume extraction pipe is arranged between the fume inlet pipe and the fume hood. Utilizing the suction force provided by the suction fan, while the suction fan is drawing in the raw material, the suction fan can also absorb the fumes generated at the die head position through the fume extraction pipe, the fume inlet pipe, and the fume hood.

Description

Technical Field

[0001] This invention relates to the field of plastic extrusion equipment technology, and in particular to an extrusion device for 3D printer consumables. Background Technology

[0002] 3D printer consumables are mainly plastic filaments, which are mostly extruded and wound by extrusion equipment. The extrusion process includes masterbatch mixing, barrel drying, screw extrusion, die extrusion, hot and cold water cooling, filament diameter testing, and winding and packaging.

[0003] Currently, Chinese patent publication number CN112810095, published on May 18, 2021, discloses a plastic strip extrusion molding production equipment, including a feeding device, a screw extruder, a first cooling device, a first traction device, a second traction device, a second cooling device, a third traction device, and a winding device; the second traction device includes a second drive motor, and the third traction device includes a third drive motor; a width adjustment component is provided between the second traction device and the third traction device, the width adjustment component includes a laser diameter gauge, the laser diameter gauge is electrically connected to the second drive motor and the third drive motor and controls the speed of the second drive motor and the third drive motor; the material is discharged from the feeding device, passes sequentially through the screw extruder, the first cooling device, the first traction device, the second traction device, the second cooling device, and the third traction device, and then enters the winding device.

[0004] Screw extruders extrude raw materials through a die, and PLA and PETG release small amounts of volatile gases such as aldehydes and esters during high-temperature extrusion. TPU and nylon, on the other hand, produce volatile substances such as amines and small-molecule plasticizers during extrusion. Long-term unorganized diffusion of these gases can cause noticeable odors and polluted air in the workshop, irritating the respiratory tract and failing to meet occupational health and environmental protection requirements. Summary of the Invention

[0005] The purpose of this invention is to provide an extrusion device for 3D printer consumables that can extract and purify the flue gas at the die head position.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: an extrusion device for 3D printer consumables, comprising a frame, a screw extruder fixed on the frame, a die head disposed at the front end of the screw extruder, a feeding assembly disposed on the upper side of the screw extruder, a cooling water tank disposed on the front side of the screw extruder for cooling the filament, a diameter gauge disposed on the side of the cooling water tank away from the screw extruder, and a take-up frame disposed on the side of the diameter gauge away from the cooling water tank. The feeding assembly includes a barrel with its lower end connected to the screw extruder, a suction box disposed on the upper end of the barrel, and a feeding assembly disposed on the upper side of the barrel. The machine includes a material drop pipe between the suction box and the material cylinder, a solenoid valve on the material drop pipe, a suction fan at the top of the suction box, a suction pipe on the side wall of the suction box, a storage bucket on one side of the frame for storing uniformly mixed raw materials, a suction head at the bottom of the suction pipe and inserted into the storage bucket, a level gauge on the inner wall of the material cylinder for detecting the height of the raw materials, a fixed frame on the frame above the die head, a fume hood on the fixed frame, a smoke inlet pipe on the side wall of the suction box, and a smoke duct between the smoke inlet pipe and the fume hood.

[0007] By adopting the above technical solution, the suction force provided by the suction fan can be used to absorb the smoke generated at the die head position through the smoke inlet pipe, smoke duct and smoke hood while the suction fan is sucking the raw materials.

[0008] A further provision of the present invention is that a connecting pipe is provided between the air inlet of the suction fan and the upper end of the suction box, and a switching component for switching suction targets is provided inside the suction box. The switching component includes a reversing elbow rotatably connected to the end of the smoke inlet pipe and located inside the suction box, a flared end provided at the end of the reversing elbow away from the smoke inlet pipe, an arc-shaped sealing plate fixed inside the suction box and shaped for the flared end to fit against, a mating interface opened on the upper end of the arc-shaped sealing plate and communicating with the connecting pipe, and a switching motor fixed on the side wall of the suction box and whose output shaft is connected to the reversing elbow.

[0009] By adopting the above technical solution, since there is an odor in the flue gas, it is necessary to avoid the flue gas coming into contact with the inner wall of the suction box, so that the raw material particles will be attached to the odor of the flue gas in the suction box. Therefore, the flue gas and raw material particles do not share the same space. At this time, the switching component in the suction box is used. When there is no raw material in the material cylinder, the switching motor drives the reversing elbow to swing downward, so that the reversing elbow swings along the arc sealing plate and leaves the docking interface. At the same time, the reversing elbow is sealed by the arc sealing plate. At this time, the suction action of the suction fan can be applied to the suction pipe, thereby sucking the raw material in the storage bucket up and storing it in the suction box. After the suction is completed, the solenoid valve of the discharge pipe is opened, so that the raw material falls into the material cylinder. After the material is fed into the cylinder, the switching motor drives the reversing elbow to swing upward, so that the reversing elbow swings along the arc sealing plate and connects with the interface. At this time, the suction action of the suction fan can be applied to the smoke inlet pipe, thereby extracting the smoke from the smoke hood.

[0010] A further feature of the present invention is that a barrier mesh is provided inside the connecting pipe to prevent raw material particles from being sucked in.

[0011] By adopting the above technical solution, the barrier net can prevent smaller raw material particles from being drawn into the suction fan due to their light weight.

[0012] A further feature of the present invention is that: an elongated opening is provided in the middle of the arc-shaped sealing plate; a swing arm is rotatably connected inside the suction box, with one end passing through the elongated opening and abutting against the flared end; a reset torsion spring is provided at the rotation position of the swing arm to help the swing arm reset; an elastic arm is provided at the end of the swing arm away from the elongated opening; a striking ball is provided at the end of the elastic arm away from the swing arm; and a resonance plate is provided on the inner wall of the suction box on both sides of the striking ball.

[0013] By adopting the above technical solution, when the solenoid valve is opened and the raw material in the suction box falls into the material cylinder, the suction fan is in a short pause state, and at the same time the switching motor is in the state of driving the reversing bend to swing upward. At this time, the swing of the reversing bend can drive the swing arm to swing, thereby driving the elastic arm and the striking ball through the swing arm, and the return torsion spring undergoes elastic torsion. After the side of the reversing bend passes the swing arm, the return torsion spring can drive the swing arm and the striking ball to swing in the opposite direction and hit the resonance plate. The resulting vibration can be transmitted to the barrier screen through the inner wall of the suction box, thereby shaking off the small particles of raw material retained in the mesh of the barrier screen. This allows these small particles of raw material to fall into the material cylinder along with the raw material falling in the suction box, thereby realizing the periodic cleaning of the small particles of raw material retained on the barrier screen and avoiding blockage of the barrier screen. Once the switching motor completes the swing of the reversing elbow, allowing it to align with the interface, the solenoid valve closes, and the suction fan starts again, subsequently drawing in the flue gas.

[0014] A further feature of the present invention is that the height of the suction pipe on the side wall of the suction box is flush with the height of the reversing elbow, and the reversing elbow is a metal copper pipe.

[0015] By adopting the above technical solution, the height of the suction pipe on the side wall of the suction box is flush with the height of the reversing elbow. When the raw material particles in the suction pipe enter the suction box, the raw material particles, due to their initial high-speed kinetic energy, will first collide with the reversing elbow. At this time, the impact force can reduce the kinetic energy of the raw material particles, allowing them to fall back quickly. At the same time, the reversing elbow is made of metal copper pipe, which has good thermal conductivity. Therefore, the high heat in the flue gas can be transferred to the suction box, creating a high-temperature environment inside the suction box. This high-temperature environment is beneficial for pre-drying the raw material particles, reducing the moisture content within the particles, and ultimately facilitating the subsequent processing of wire.

[0016] A further provision of the present invention is that the upper side of the smoking hood is also provided with a temporary storage component for temporarily storing smoke. The temporary storage component includes a flexible bag wrapped around the upper side of the smoking hood, a suction tube disposed at the lower end of the smoking pipe and passing through the flexible bag, a fixing connecting rod disposed between the lower end of the suction tube and the smoking hood, and a suction hole opened on the side wall of the suction tube for sucking smoke from the flexible bag.

[0017] By adopting the above technical solution, when the suction box uses the suction tube to suck up raw materials, the flue gas cannot be sucked up by the suction fan. At this time, a temporary storage component is also set on the upper side of the fume hood. When no suction is provided in the fume hood, the flue gas flows upward due to its high temperature. Then the flue gas can enter the flexible bag. The flue gas can be temporarily stored by the expansion of the flexible bag. When the suction tube provides suction, the suction tube can suck up the flue gas temporarily stored in the flexible bag through the suction hole. After the flexible bag dries up, it is convenient to store the flue gas again. After the flexible bag dries up, it can stick to the outer wall of the suction tube, thereby sealing the suction hole on the side wall of the suction tube. Finally, the suction tube can concentrate the suction power to suck up the flue gas downward.

[0018] A further feature of the present invention is that the flexible bag is made of high-temperature resistant nylon material.

[0019] By adopting the above technical solution, the flexible bag is made of high-temperature resistant nylon material, thereby preventing the flexible bag from melting at high temperatures.

[0020] A further feature of the present invention is that an extension pipe is provided at the air outlet of the suction fan, and a cover is provided at the end of the extension pipe away from the suction fan, and a filter bag connected to the extension pipe at its upper end is provided inside the cover.

[0021] By adopting the above technical solution, when the suction fan draws in the raw material particles, the dust inside the particles can be filtered out through the filter bag.

[0022] A further feature of the present invention is that an activated carbon filter plate is provided inside the lower end of the wrapping sleeve.

[0023] By adopting the above technical solution, when the exhaust fan draws in smoke, the activated carbon filter plate can filter out the harmful substances in the smoke.

[0024] The beneficial effects of this invention are as follows: During the process of the suction fan sucking raw materials, the suction fan can also absorb the smoke generated at the die head position through the smoke pipe, smoke inlet pipe and smoke hood; since there is an odor in the smoke, it is necessary to avoid the smoke from coming into contact with the inner wall of the suction box, so that the raw material particles will be attached to the odor of the smoke in the suction box. Therefore, the smoke and raw material particles do not share the same space; at this time, using the switching component in the suction box, when there is no raw material in the material cylinder, the switching motor drives the reversing elbow to swing downward, so that the reversing elbow swings along the arc sealing plate and leaves the interface. At the same time, the reversing elbow is sealed by the arc sealing plate. At this time, the suction action of the suction fan can act on the suction pipe, thereby sucking the raw material in the storage bucket up and storing it in the suction box. After the suction is completed, the solenoid valve of the discharge pipe is opened, so that the raw material falls into the material cylinder; Meanwhile, when the suction box extracts raw materials, it also utilizes the temporary storage component on the upper side of the fume hood. When the fume hood does not provide suction, the smoke flows upward due to its high heat, and then the smoke can enter the flexible bag. The smoke can be temporarily stored by the expansion of the flexible bag. After the material is fed into the cylinder, the switching motor drives the reversing elbow to swing upward, so that the reversing elbow swings along the arc sealing plate and connects with the interface. At this time, the suction action of the suction fan can be applied to the smoke inlet pipe, thereby extracting the smoke from the smoke hood. The suction pipe can use the suction hole to suck the smoke temporarily stored in the flexible bag, so that the flexible bag can be emptied to facilitate the next temporary storage of smoke. At the same time, the emptied flexible bag can be attached to the outer wall of the suction pipe, thereby sealing the suction hole on the side wall of the suction pipe. Finally, the suction pipe can concentrate the suction force to draw the smoke downward. When the solenoid valve opens and the material in the suction box falls into the hopper, the suction fan is briefly paused. At the same time, the switching motor is driving the reversing elbow to swing upward. The swing of the reversing elbow drives the swing arm to swing, which in turn drives the elastic arm and the striking ball. The return torsion spring is also elastically torn. After the side of the reversing elbow passes the swing arm, the return torsion spring drives the swing arm and the striking ball to swing in the opposite direction and hit the resonance plate. The resulting vibration is transmitted through the inner wall of the suction box to the barrier screen, thereby shaking off the small particles of material trapped in the mesh of the barrier screen. These small particles can then fall into the hopper along with the material falling from the suction box, thus periodically cleaning the small particles trapped in the barrier screen and preventing blockage. Once the switching motor completes the swing of the reversing elbow and the reversing elbow is connected to the interface, the solenoid valve closes, and the suction fan starts again, and then the flue gas can be sucked up. Simultaneously, by utilizing the fact that the height of the suction pipe on the side wall of the suction box is flush with the height of the reversing elbow, when the raw material particles in the suction pipe enter the suction box, the raw material particles, due to their initial high-speed kinetic energy, will first collide with the reversing elbow. At this time, the impact force can reduce the kinetic energy of the raw material particles, allowing them to fall back quickly. At the same time, by utilizing the fact that the reversing elbow is made of metal copper pipe, which has good thermal conductivity, the high heat in the flue gas can be transferred to the suction box, creating a high-temperature environment inside the suction box. This high-temperature environment is beneficial for pre-drying the raw material particles, reducing the moisture content within the particles, and ultimately facilitating the subsequent processing of wire. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a structural plan view of the present invention.

[0027] Figure 2 This is a schematic diagram of the structure of the frame, screw extruder, feeding assembly, and temporary storage assembly in this invention; Figure 3 This is a schematic diagram of the feeding assembly in this invention; Figure 4 This is a partial structural cross-sectional view of the feeding assembly in this invention. At this point, the reversing elbow and the docking interface are connected, and the suction fan draws out the smoke. Figure 5This is a partial structural cross-sectional view of the feeding assembly in this invention. At this time, the reversing elbow is blocked by the arc sealing plate, and the suction fan sucks up the raw material particles. Figure 6 This is a partial cross-sectional view of the internal structure of the suction box in this invention; Figure 7 This is a cross-sectional view showing the connection relationship between the fumigation hood and the temporary storage component in this invention.

[0028] In the diagram, 1. Frame; 11. Screw extruder; 111. Die head; 12. Fixing frame; 121. Fume hood; 2. Feed assembly; 21. Barrel; 22. Suction box; 221. Fume inlet pipe; 222. Fume duct; 223. Swing arm; 2231. Return torsion spring; 2232. Elastic arm; 2233. Striking ball; 224. Resonance plate; 23. Drop pipe; 24. Solenoid valve; 25. Suction fan; 251. Connecting pipe; 2511. Barrier mesh; 2 6. Suction pipe; 27. Storage bucket; 28. Suction head; 3. Cooling water tank; 4. Diameter gauge; 5. Rewinding rack; 6. Switching assembly; 61. Reversing elbow; 62. Flared end; 63. Arc sealing plate; 631. Long slot; 64. Butt joint; 65. Switching motor; 7. Temporary storage assembly; 71. Flexible bag; 72. Suction pipe; 73. Fixing rod; 74. Suction hole; 8. Extension pipe; 81. Wrapping sleeve; 82. Filter bag; 83. Activated carbon filter plate. Detailed Implementation

[0029] The technical solution of the present invention will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] An extrusion device for 3D printer filament, as described in the following example. Figure 1 The extrusion equipment for this type of 3D printer consumable includes a frame 1, a screw extruder 11 fixed on the frame 1, a die 111 located at the front end of the screw extruder 11, a feeding assembly 2 located on the upper side of the screw extruder 11, a cooling water tank 3 located on the front side of the screw extruder 11 for cooling the filament, a diameter gauge 4 located on the side of the cooling water tank 3 away from the screw extruder 11, and a winding rack 5 located on the side of the diameter gauge 4 away from the cooling water tank 3. The screw extruder 11 melts and extrudes the raw material from the die 111 into filament. After the filament is cooled by the cooling water tank 3, it is inspected by the diameter gauge 4 and then wound up by the winding rack 5.

[0031] Reference Figure 2 , Figure 3The feeding assembly 2 includes a barrel 21 connected to the screw extruder 11 at its lower end, a suction box 22 located at the upper end of the barrel 21, a discharge pipe 23 located between the suction box 22 and the barrel 21, a solenoid valve 24 located on the discharge pipe 23, a suction fan 25 located at the upper end of the suction box 22, a suction pipe 26 located on the side wall of the suction box 22, a storage tank 27 located on one side of the frame 1 for storing uniformly mixed raw materials, and a suction head 28 located at the lower end of the suction pipe 26 and inserted into the storage tank 27. A level gauge for detecting the height of the raw materials is provided on the inner wall of the barrel 21. When the level gauge detects that the material level is insufficient, the solenoid valve 24 closes, and the suction fan 25 sucks the raw materials in the storage tank 27 into the suction box 22 through the suction pipe 26. Then, the solenoid valve 24 is opened, and the raw materials at the bottom of the suction box 22 fall into the barrel 21.

[0032] Reference Figure 3 , Figure 4 , Figure 5 , Figure 6 A mounting bracket 12 is bolted to the frame 1 and located above the die head 111. A fume hood 121 is bolted to the mounting bracket 12. A smoke inlet pipe 221 is bolted to the side wall of the suction box 22, and a smoke inlet pipe 222 connects the smoke inlet pipe 221 and the fume hood 121. A connecting pipe 251 is bolted between the air inlet of the suction fan 25 and the upper end of the suction box 22, and a barrier net 2511 is fixed inside the connecting pipe 251 to prevent raw material particles from being sucked in. A switching component 6 for switching suction targets is provided inside the suction box 22. This switching component 6 includes a reversing elbow 61, a flared end 62, an arc-shaped sealing plate 63, a mating interface 64, and a cutting... The switching motor 65 has a reversing elbow 61, one end of which is rotatably connected to the end of the smoke inlet pipe 221 and located inside the suction box 22. The flared end 62 is integrally set at the end of the reversing elbow 61 away from the smoke inlet pipe 221. At the same time, the arc sealing plate 63 is welded and fixed inside the suction box 22 and is positioned to fit the flared end 62. The interface 64 is opened on the upper end of the arc sealing plate 63 and is connected to the connecting pipe 251. The switching motor 65 is fixed to the side wall of the suction box 22 by bolts and its output shaft is connected to the reversing elbow 61. The switching motor 65 drives the reversing elbow 61 to rotate. At the same time, the height of the suction pipe 26 on the side wall of the suction box 22 is flush with the height of the reversing elbow 61, and the reversing elbow 61 is a metal copper pipe.

[0033] Reference Figure 4 An extension pipe 8 is fixed to the air outlet of the exhaust fan 25 by bolts. A cover 81 is fixed to the end of the extension pipe 8 away from the exhaust fan 25 by bolts. A filter bag 82 connected to the extension pipe 8 at its upper end is installed inside the cover 81, and an activated carbon filter plate 83 is fixed to the lower end of the cover 81 by bolts.

[0034] Reference Figure 4 , Figure 5 The arc-shaped sealing plate 63 has a long opening 631 in the middle, and the long opening 631 is long and thin. Inside the suction box 22, there is a swing arm 223 that is rotatably connected, with one end passing through the long opening 631 and being abutted by the flared end 62. A reset torsion spring 2231 is provided at the rotation position of the swing arm 223. The reset torsion spring 2231 follows the swing arm 223 to twist. The elastic restoring force of the reset torsion spring 2231 can be used to help the swing arm 223 reset. At the same time, an elastic arm 2232 is welded to the end of the swing arm 223 away from the long opening 631, and a striking ball 2233 is bonded and fixed to the end of the elastic arm 2232 away from the swing arm 223. Resonance plates 224 are welded to the inner wall of the suction box 22 and on both sides of the striking ball 2233.

[0035] Reference Figure 2 , Figure 7 The upper side of the fumigation hood 121 is also provided with a temporary storage component 7 for temporarily storing smoke. The temporary storage component 7 includes a flexible bag 71, a suction tube 72, a fixing rod 73, and suction holes 74. The flexible bag 71 is wrapped and fixed to the upper side of the fumigation hood 121 and is made of high-temperature resistant nylon material. The suction tube 72 is fixed to the lower end of the fumigation pipe 222 and passes through the flexible bag 71. The upper end of the flexible bag 71 is bonded and fixed to the upper end of the suction tube 72. The fixing rod 73 is fixed between the lower end of the suction tube 72 and the fumigation hood 121. The fixing rod 73 fixes the position of the suction tube 72 inside the upper side of the fumigation hood 121. At the same time, multiple suction holes 74 are provided and opened on the side wall of the suction tube 72. The suction holes 74 can be used to suck the smoke in the flexible bag 71.

[0036] Principle: During the process of suctioning raw materials, the suction fan 25 can also absorb the fumes generated at the die head 111 through the smoke pipe 222, the smoke inlet pipe 221, and the smoke hood 121. Since the fumes contain odors, it is necessary to prevent the fumes from contacting the inner wall of the suction box 22, which would cause the raw material particles to become contaminated with the odor. Therefore, the fumes and raw material particles must not share the same space. At this time, the switching component 6 inside the suction box 22 is used to switch the material cylinder 2... When there is a lack of raw materials in the container, the switching motor 65 drives the reversing elbow 61 to swing downward, so that the reversing elbow 61 swings along the arc sealing plate 63 and leaves the docking interface 64. At the same time, the reversing elbow 61 is sealed by the arc sealing plate 63. At this time, the suction action of the suction fan 25 can be applied to the suction pipe 26, thereby sucking the raw materials in the storage bucket 27 up and storing them in the suction box 22. After the suction is completed, the solenoid valve 24 of the discharge pipe 23 is opened, so that the raw materials fall into the material cylinder 21. Meanwhile, when the suction box 22 extracts raw materials, it also utilizes the temporary storage component 7 on the upper side of the fume hood 121. When the fume hood 121 does not provide suction, the smoke flows upward due to its high heat. Then the smoke can enter the flexible bag 71, and the smoke can be temporarily stored by the expansion of the flexible bag 71. After the material is fed into the cylinder 21, the switching motor 65 drives the reversing elbow 61 to swing upward, so that the reversing elbow 61 swings along the arc sealing plate 63 and docks with the interface 64. At this time, the suction action of the suction fan 25 can be applied to the smoke inlet pipe 221, thereby extracting the smoke at the position of the smoke hood 121. The suction pipe 72 can use the suction hole 74 to suck the smoke temporarily stored in the flexible bag 71, so that the flexible bag 71 can be shrunken to facilitate the next temporary storage of smoke. At the same time, after the flexible bag 71 is shrunken, it can be attached to the outer wall of the suction pipe 72, thereby sealing the suction hole 74 on the side wall of the suction pipe 72. Finally, the suction pipe 72 can concentrate its suction force to draw the smoke downward. When the solenoid valve 24 opens and the raw material in the suction box 22 falls into the material cylinder 21, the suction fan 25 is in a short pause state. At the same time, the switching motor 65 is driving the reversing bend 61 to swing upward. At this time, the swing of the reversing bend 61 can drive the swing arm 223 to swing, thereby driving the elastic arm 2232 and the striking ball 2233 through the swing arm 223. The return torsion spring 2231 undergoes elastic torsion. After the side of the reversing bend 61 passes the swing arm 223, the return torsion spring 2231 can drive the swing arm 223 and the striking ball 2233 to swing in the opposite direction and hit the resonance plate 224, generating The vibration effect is transmitted through the inner wall of the suction box 22 to the barrier screen 2511, thereby shaking off the small particles of raw material trapped in the mesh of the barrier screen 2511. This allows these small particles of raw material to fall into the material cylinder 21 along with the raw material falling in the suction box 22, thus achieving regular cleaning of the small particles of raw material trapped on the barrier screen 2511 and avoiding blockage of the barrier screen 2511. After the switching motor 65 completes the swing of the reversing elbow 61, so that the reversing elbow 61 is connected with the docking interface 64, the solenoid valve 24 can be closed, and the suction fan 25 continues to start, and then the flue gas can be sucked up. Meanwhile, the height of the suction pipe 26 on the side wall of the suction box 22 is flush with the height of the reversing elbow 61. When the raw material particles in the suction pipe 26 enter the suction box 22, the raw material particles, due to their initial high-speed kinetic energy, will first collide with the reversing elbow 61. At this time, the impact force can reduce the kinetic energy of the raw material particles, allowing them to fall back quickly. At the same time, the reversing elbow 61 is made of copper pipe, which has good thermal conductivity. Therefore, it can transfer the high heat in the flue gas to the suction box 22, creating a high-temperature environment inside the suction box 22. This high-temperature environment is beneficial for pre-drying the raw material particles, reducing the moisture content within them, and ultimately facilitating the subsequent processing of wire.

Claims

1. An extrusion device for 3D printer consumables, comprising a frame (1), a screw extruder (11) fixed on the frame (1), a die (111) disposed at the front end of the screw extruder (11), a feed assembly (2) disposed on the upper side of the screw extruder (11), a cooling water tank (3) disposed on the front side of the screw extruder (11) for cooling the filament, a diameter gauge (4) disposed on the side of the cooling water tank (3) away from the screw extruder (11), and a winding rack (5) disposed on the side of the diameter gauge (4) away from the cooling water tank (3), wherein the feed assembly (2) includes a barrel (21) whose lower end is connected to the screw extruder (11). The following components are provided: a suction box (22) located at the upper end of the material cylinder (21); a discharge pipe (23) located between the suction box (22) and the material cylinder (21); a solenoid valve (24) located on the discharge pipe (23); a suction fan (25) located at the upper end of the suction box (22); a suction pipe (26) located on the side wall of the suction box (22); a storage bucket (27) located on one side of the frame (1) for storing uniformly mixed raw materials; and a suction head (28) located at the lower end of the suction pipe (26) and inserted into the storage bucket (27). The inner wall of the material cylinder (21) is provided with a level gauge for detecting the height of the raw materials. A fixed frame (12) is provided on the frame (1) and above the die head (111). A fumigation hood (121) is provided on the fixed frame (12). A smoke inlet pipe (221) is provided on the side wall of the suction box (22). A smoke inlet pipe (222) is provided between the smoke inlet pipe (221) and the fumigation hood (121).

2. The extrusion equipment for 3D printer consumables according to claim 1, characterized in that: A connecting pipe (251) is provided between the air inlet of the suction fan (25) and the upper end of the suction box (22). A switching component (6) for switching suction targets is provided in the suction box (22). The switching component (6) includes a reversing elbow (61) rotatably connected to the end of the smoke inlet pipe (221) and located in the suction box (22), a flared end (62) located at the end of the reversing elbow (61) away from the smoke inlet pipe (221), an arc sealing plate (63) fixed in the suction box (22) and designed to fit the flared end (62), a mating interface (64) opened on the upper end of the arc sealing plate (63) and connected to the connecting pipe (251), and a switching motor (65) fixed on the side wall of the suction box (22) and whose output shaft is connected to the reversing elbow (61).

3. The extrusion equipment for 3D printer consumables according to claim 2, characterized in that: The connecting pipe (251) is provided with a barrier net (2511) to prevent raw material particles from being sucked in.

4. The extrusion equipment for 3D printer consumables according to claim 3, characterized in that: The arc sealing plate (63) has a long opening (631) in the middle. A swing arm (223) is rotatably connected inside the suction box (22), with one end passing through the long opening (631) and the flared end (62) abutting against it. A reset torsion spring (2231) is provided at the rotation position of the swing arm (223) to help the swing arm (223) reset. An elastic arm (2232) is provided at the end of the swing arm (223) away from the long opening (631). A striking ball (2233) is provided at the end of the elastic arm (2232) away from the swing arm (223). A resonance plate (224) is provided on the inner wall of the suction box (22) and on both sides of the striking ball (2233).

5. The extrusion equipment for 3D printer consumables according to claim 2, characterized in that: The height of the suction pipe (26) on the side wall of the suction box (22) is flush with the height of the reversing elbow (61), which is a metal copper pipe.

6. The extrusion equipment for 3D printer consumables according to claim 2, characterized in that: The upper side of the smoking hood (121) is also provided with a temporary storage component (7) for temporarily storing smoke. The temporary storage component (7) includes a flexible bag (71) wrapped around the upper side of the smoking hood (121), a suction tube (72) set at the lower end of the smoking pipe (222) and passing through the flexible bag (71), a fixed connecting rod (73) set between the lower end of the suction tube (72) and the smoking hood (121), and a suction hole (74) opened on the side wall of the suction tube (72) for sucking smoke from the flexible bag (71).

7. The extrusion equipment for 3D printer consumables according to claim 6, characterized in that: The flexible bag (71) is made of high-temperature resistant nylon material.

8. The extrusion equipment for 3D printer consumables according to claim 1, characterized in that: An extension pipe (8) is provided at the air outlet of the suction fan (25). A cover (81) is provided at the end of the extension pipe (8) away from the suction fan (25). A filter bag (82) with its upper end connected to the extension pipe (8) is provided inside the cover (81).

9. The extrusion equipment for 3D printer consumables according to claim 8, characterized in that: An activated carbon filter plate (83) is provided inside the lower end of the wrapping sleeve (81).

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