Feeding device for 3D printer

Abstract

The invention relates to the technical field of 3D printing feeding devices, in particular to a feeding device for a 3D printer, which comprises a coordinate positioning frame, a printing head is movably mounted in the coordinate positioning frame, the coordinate positioning frame is used for positioning and driving the printing head in the three-dimensional direction, a heat dissipation net is fixedly mounted in the printing head, and a supporting cylinder is arranged at the inner end of the heat dissipation net in a penetrating manner; the feeding device comprises a feeding channel, a supporting cylinder is arranged in the feeding channel, a temperature sensing cylinder is fixedly installed at the bottom end of the supporting cylinder, and a dredging device is arranged in the supporting cylinder and used for periodically disturbing or guiding the feeding path. The vibration structure is driven by steam generated in the melting process to periodically disturb the inner wall of the material loosening pipe, so that particle raw materials are kept in a loose state in the conveying process, the particle raw materials are effectively prevented from being stacked or bridging in the feeding pipe and a flow guide plate area, and therefore the continuity and stability of the 3D printing feeding process are improved.

Description

Technical Field

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

[0002] With the continuous evolution of additive manufacturing (3D printing) technology, particulate feedstock (FGF) technology has been widely used in the fields of large structural component manufacturing and high-performance composite material development due to its advantages such as low material cost, fast printing speed and the ability to directly use industrial-grade modified plastic particles. In the process of particulate feedstock 3D printing, the coordinated stability of the feeding device and the melt extrusion mechanism is the key to determining the printing quality.

[0003] Although existing technologies employ sparse flow channels for feeding to reduce the risk of blockage, the granular raw materials are prone to "bridging" or accumulating in the guide area during the process of entering the extruder feeding channel from the hopper due to irregular particle shape, electrostatic adsorption, or the influence of environmental humidity. Existing technologies often use simple gravity feeding or passive vibration, which is often difficult to cope with the continuous conveying requirements of high viscosity or irregular particles, leading to feeding interruptions and causing interlayer breakage in the printed parts. Therefore, this application proposes a feeding device for 3D printers. Summary of the Invention

[0004] The purpose of this invention is to provide a feeding device for a 3D printer to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a feeding device for a 3D printer, comprising a coordinate positioning frame, a print head movably mounted inside the coordinate positioning frame, the coordinate positioning frame being used for positioning and driving the print head in three dimensions, a heat dissipation mesh being fixedly mounted inside the print head, a support cylinder passing through the inner end of the heat dissipation mesh, the support cylinder being used for mounting and supporting various functional components inside the print head, a temperature sensing cylinder being fixedly mounted at the bottom end of the support cylinder, a nozzle being fixedly mounted at the bottom end of the temperature sensing cylinder, a central tube being fixedly mounted at the upper end of the temperature sensing cylinder, a feeding tube being detachably mounted at the upper end of the support cylinder, a pressure tube being fixedly mounted on the outer surface of the feeding tube, the pressure tube being used for applying pressure to the printing material inside the feeding tube, and a dredging device being provided inside the support cylinder for periodically disturbing or guiding the feeding path.

[0006] As a further embodiment of the present invention, a guide tube is fixedly installed at the inner end of the support cylinder, and multiple guide plates are arranged below the feeding pipe in a ring shape along the circumference of the guide tube. A limit ring is fixedly installed on the outer surface of the feeding pipe, and movable holes are opened on the surface of each of the multiple guide plates. By setting a guide tube inside the support cylinder and setting multiple guide plates arranged in a ring shape along the circumference of the guide tube below the feeding pipe, the granular raw materials entering the feeding pipe can be diverted and guided during the falling process, avoiding the accumulation of raw materials, thereby improving the uniformity and stability of the falling raw materials.

[0007] As a further embodiment of the present invention, multiple limiting rods are fixedly installed at the bottom end of the limiting ring, and the multiple limiting rods are respectively inserted into the corresponding movable holes. The guide plate is inserted and movably disposed inside the guide cylinder. The central tube is located inside the support cylinder. A heating sleeve is sleeved on the outer surface of the central tube. The heating sleeve is used to heat the granular raw material inside the central tube. By opening movable holes in the guide plate and inserting the limiting rods therein, the guide plate can maintain a fixed direction and generate moderate movement inside the guide cylinder. This allows the raw material to be diverted and guided during the falling of the granular raw material, reducing raw material accumulation and bridging, and improving the uniformity and continuity of feeding.

[0008] As a further embodiment of the present invention, the unblocking device includes a loosening pipe, which is inserted and disposed inside the central pipe. The central pipe is connected to the spray head through a melting cylinder. The upper end of the loosening pipe extends into the interior of the guide cylinder for loosening and guiding the particulate raw materials entering the central pipe. An annular cavity is formed between the melting cylinder and the temperature sensing cylinder. The cavity is filled with a liquid medium, which is heated under the high temperature of the melting cylinder.

[0009] As a further embodiment of the present invention, the lower end of the loosening tube is inserted into the interior of the melting cylinder, and multiple air guide tubes are fixedly installed on the outer surface of the loosening tube. The multiple air guide tubes are distributed circumferentially along the loosening tube, and the end of the air guide tube away from the loosening tube extends and inserts into the interior of the melting cylinder. The air inlet of the air guide tube is exposed on the outer surface of the melting cylinder.

[0010] As a further embodiment of the present invention, a vibrating tube is provided through the inner end of the loosening tube, a mating cavity is provided at the inner end of the loosening tube, and a movable block is slidably installed at the inner end of the mating cavity. An air jet pipe is fixedly connected to the upper end of the movable block, and the air jet pipe is installed inside the vibrating tube.

[0011] As a further embodiment of the present invention, a flow divider sleeve is fixedly installed on the surface of the loosening pipe, and multiple return pipes are fixedly connected to the surface of the flow divider sleeve. The output end of the return pipe passes through the inside of the temperature sensing cylinder, and the input end of the return pipe is fixedly connected to the loosening pipe. By setting a flow divider sleeve on the surface of the loosening pipe and fixing multiple return pipes on the flow divider sleeve, some particulate raw materials or gas can return to the inside of the temperature sensing cylinder along the return pipe during the feeding process, thereby realizing the circulation adjustment of the feeding channel.

[0012] As a further embodiment of the present invention, a cone block is fixedly installed at the upper end of the vibrating tube, and the bottom end of the cone block is in contact with the upper end of the jet pipe. Multiple jet holes are opened on the outer surface of the jet pipe, and multiple sets of jet holes are distributed circumferentially along the jet pipe. By fixing the cone block at the upper end of the vibrating tube and making the cone block in contact with the upper end of the jet pipe, and opening multiple circumferentially distributed jet holes on the outer surface of the jet pipe, the gas force can be effectively transmitted to the vibrating tube when the jet pipe sprays gas.

[0013] As a further embodiment of the present invention, a passive ring is fixedly installed at the inner end of the vibrating tube. The position of the passive ring corresponds to the jet hole. Several blades are fixedly installed at the inner end of the passive ring. When the jet hole sprays gas outward, the sprayed gas acts on the passive ring and the blades on it, thereby driving the passive ring to generate a rotational tendency, and further driving the vibrating tube to rotate and shake. By setting a passive ring at the inner end of the vibrating tube and fixing several blades at the inner end of the passive ring, the gas sprayed from the jet hole acts on the blades and drives the passive ring to rotate, thereby driving the vibrating tube to rotate and shake.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention provides a clearing device consisting of a loosening pipe, a vibrating pipe, an air jet pipe, and a passive ring within the feeding channel. The steam generated during the melting process drives the vibrating structure to periodically disturb the inner wall of the loosening pipe, keeping the granular raw material in a loose state during transportation. This effectively prevents the granular raw material from accumulating or bridging in the feeding pipe and guide plate area, thereby improving the continuity and stability of the 3D printing feeding process. 2. This invention, by setting a melting cylinder at the front end of the nozzle, allows the molten printing material to form a relatively stable molten pool before entering the nozzle. In conjunction with the gas guide tube, the gas in the molten material is guided and discharged, which can effectively reduce the probability of air bubbles being generated inside the extruded printing material and improve the density of the extruded material and the printing quality. 3. This invention forms a heat transfer and regulation structure by setting up a heating jacket, a temperature sensing cylinder, a heat equalization tube, and a heat conduction tube, so that the temperature distribution of the printing material is more uniform during the heating and melting process. In addition, the gas flow carries away excess heat, avoiding excessive softening of the printing material due to excessive local temperature, thereby reducing the risk of model collapse during the printing process. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the 3D printing device. Figure 2 A schematic diagram of a 3D printing feeding device; Figure 3 This is a structural diagram showing the disassembly of the support cylinder and the feeding pipe; Figure 4 This is a schematic diagram of the internal structure of the support cylinder; Figure 5 This is a schematic diagram of the internal structure of the feeding pipe; Figure 6 This is a schematic diagram of the internal structure of the central tube and the temperature sensing cylinder; Figure 7 This is a schematic diagram of the cross-sectional structure of the melting cylinder; Figure 8 This is a schematic diagram of the internal structure of the feed tube; Figure 9 This is a schematic diagram of the internal structure of the feed tube; Figure 10 This is a schematic diagram of the internal structure of the jet pipe; Figure 11 This is a diagram showing the ejection direction of the jet nozzle.

[0016] In the diagram: 1. Coordinate positioning frame; 2. Print head; 3. Feeding pipe; 4. Pressurization pipe; 5. Heat conduction pipe; 101. Heat dissipation mesh; 102. Temperature sensing cylinder; 103. Injector head; 104. Input pipe; 105. Support cylinder; 201. Limiting ring; 202. Guide plate; 203. Limiting rod; 204. Movable hole; 205. Heat equalizing tube; 301. Guide tube; 302. Heating jacket; 303. Loosening tube; 304. Center tube; 305. Diverter sleeve; 306. Return tube; 307. Melting cylinder; 308. Gas guide tube; 309. Fitting tube; 310. Fitting cavity; 401. Moving block; 402. Passive ring; 403. Jet pipe; 404. Conical block; 405. Vibrating pipe; 406. Drainage groove; 407. Jet hole. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Example 1: Please refer to Figures 1-4 A feeding device for a 3D printer includes a coordinate positioning frame 1, inside which a print head 2 is movably mounted. The coordinate positioning frame 1 is used to position and drive the print head 2 in three dimensions to achieve precise movement of the print head 2 along a preset printing path. A heat dissipation mesh 101 is fixedly installed inside the print head 2 to dissipate heat from the internal working area of ​​the print head 2, preventing excessively high local temperatures caused by prolonged printing and thus affecting printing stability. A support cylinder 105 is inserted through the inner end of the heat dissipation mesh 101. The support cylinder 105 is used to install and support the various functional components inside the print head 2. A temperature sensing cylinder 102 is fixedly installed at the bottom end of the support cylinder 105. The temperature sensing cylinder 102 is equipped with a temperature sensing component for detecting the temperature of the printing material, so as to realize real-time monitoring of the melting state of the printing material. A nozzle 103 is fixedly installed at the bottom end of the temperature sensing cylinder 102. The nozzle 103 is used to extrude the molten or flowable printing material according to a set path to complete the layer-by-layer molding printing. The upper end of the support cylinder 105 is detachably equipped with a feeding pipe 3, which is used to feed the raw material required for printing into the print head 2 so as to achieve continuous feeding. The coordinate positioning frame 1 is equipped with a servo control device for driving the print head 2 to move. The servo control device is used to control the movement of the print head 2 in the X, Y and Z directions according to the preset printing program, so as to realize the layer-by-layer printing of the mold or the molded part. The servo control device is a mature technology in this field, and its specific structure and working principle will not be described in detail here. A pressure tube 4 is fixedly installed on the outer surface of the feeding tube 3. The pressure tube 4 is used to apply pressure to the printing material in the feeding tube 3 to enhance the stability of the printing material during the process of conveying it to the nozzle 103, and to avoid affecting the printing continuity and forming quality due to poor material supply. Specifically, the feeding tube 3 is connected to the particle feeder, which continuously supplies the granular raw material required for printing into the feeding tube 3 to meet the need for continuous material supply during the 3D printing process. The particle feeder is a common and mature device in this field, and its specific structure will not be described in detail. To prevent bridging effects caused by accumulation, pressure, or inter-particle friction of granular raw materials inside the feeding pipe 3, which could lead to poor material conveying or even blockage, a clearing device is installed inside the support cylinder 105. This device is used to periodically disturb or guide the feeding path to promote the smooth falling and conveying of granular raw materials, thereby improving the reliability and stability of the feeding process.

[0019] like Figures 3-5As shown, a guide tube 301 is fixedly installed at the inner end of the support tube 105. Multiple guide plates 202 are arranged below the feeding pipe 3. The multiple guide plates 202 are arranged in a ring around the circumference of the guide tube 301, and the lower part of the multiple guide plates 202 is generally set in a conical structure to facilitate the centralized guidance of the granular raw materials. When the feeding pipe 3 is pulled out from the support tube 105, the multiple guide plates 202 are relatively unfolded under the action of gravity, so that the interior of the guide tube 301 is open, which facilitates the cleaning and maintenance of the residual granular raw materials inside. A limiting ring 201 is fixedly installed on the outer surface of the feeding pipe 3. Each of the multiple guide plates 202 has a movable hole 204. Multiple limiting rods 203 are fixedly installed at the bottom end of the limiting ring 201, and the multiple limiting rods 203 pass through the corresponding movable holes 204. Specifically, a limiting block is fixedly installed at the bottom end of the limiting rod 203. The limiting block is located below the movable hole 204, and the outer dimensions of the limiting block are larger than the diameter of the movable hole 204, thereby limiting the movement of the guide plate 202, preventing the guide plate 202 from disengaging from the limiting structure, ensuring the stability of the guide plate 202 during the opening and closing process, and the guide plate 202 passes through and is movably disposed inside the guide cylinder 301. A central tube 304 is fixedly installed at the upper end of the temperature sensing cylinder 102. The central tube 304 is located inside the support cylinder 105. The central tube 304 is connected to the nozzle 103 through the melting cylinder 307 and is used to form the main conveying and heating channel for printing raw materials. A heating sleeve 302 is sleeved on the outer surface of the central tube 304. The heating sleeve 302 is used to heat the granular raw materials inside the central tube 304 so that the granular raw materials gradually reach a molten or flowable state suitable for extrusion before entering the nozzle 103.

[0020] Example 2: Please refer to Figure 4 , Figures 6-8A feeding device for a 3D printer, based on Embodiment 1, includes a material loosening tube 303 that passes through and is disposed inside a central tube 304. The upper end of the material loosening tube 303 extends into the interior of a guide cylinder 301, serving to loosen and guide the granular material entering the central tube 304, preventing accumulation or bridging of the granular material during its descent and heating process. The granular material inside the central tube 304 gradually melts under the action of the heating sleeve 302 and flows into the interior of a melting cylinder 307. A relatively stable molten pool structure is formed inside the molten pool. By setting the molten pool, the printing material is fully melted and gas is released before entering the nozzle 103, thereby avoiding the generation of air bubbles inside the printing material extruded from the nozzle 103 and improving the printing quality. An annular cavity is formed between the melting cylinder 307 and the temperature sensing cylinder 102. The cavity is filled with a liquid medium, preferably pure water. The liquid medium is heated under the high temperature of the melting cylinder 307 to achieve indirect heat transfer and temperature buffering of the melting cylinder 307, thereby making the temperature distribution of the molten pool more uniform. The lower end of the loosening tube 303 passes through the interior of the melting cylinder 307. Multiple air guide tubes 308 are fixedly installed on the outer surface of the loosening tube 303. The multiple air guide tubes 308 are distributed around the circumference of the loosening tube 303, and the end of the air guide tube 308 away from the loosening tube 303 extends and passes through the interior of the melting cylinder 307. The air inlet of the air guide tube 308 is exposed on the outer surface of the melting cylinder 307. Specifically, the liquid level between the melting cylinder 307 and the temperature sensing cylinder 102 is located below the air guide tube 308, thereby ensuring that the air guide tube 308 can smoothly intake air during operation. A vibration tube 405 is inserted through the inner end of the loosening tube 303. A mating cavity 310 is opened at the inner end of the loosening tube 303, and a movable block 401 is slidably installed at the inner end of the mating cavity 310. An air jet pipe 403 is fixedly connected to the upper end of the movable block 401. The air jet pipe 403 is inserted inside the vibration tube 405. Specifically, limit plates are fixedly installed on both the upper and lower sides of the mating cavity 310. The two limit plates restrict the movable block 401, so the movable block 401 can only move up and down within the mating cavity 310.

[0021] like Figures 7-9As shown, a mating tube 309 is inserted inside the nozzle 103. The upper end of the mating tube 309 extends into the interior of the melting cylinder 307, and the upper end of the mating tube 309 is configured as a funnel-shaped structure to facilitate the collection and guidance of molten printing material. A groove is opened at the bottom of the interior of the melting cylinder 307, and the upper end of the mating tube 309 is inserted into the groove. The size of the groove is slightly larger than the outer diameter of the funnel-shaped upper end of the mating tube 309, thereby forming a gap fit structure between the mating tube 309 and the melting cylinder 307. When the material release tube 303 vibrates during operation and causes the melting cylinder 307 to resonate, the mating tube 309 can maintain a relatively independent state relative to the melting cylinder 307 and not vibrate synchronously with it, thereby isolating and buffering the vibration, preventing the vibration from being directly transmitted to the material outlet channel of the nozzle 103, reducing the material outlet fluctuation caused by vibration, and helping to improve the line consistency and final printing quality during the printing process. Multiple drainage grooves 406 are provided on the surface of the movable block 401, and a notch is provided at the lower end of the movable block 401, corresponding to the drainage grooves 406. When the movable block 401 is placed above the mating cavity 310, the drainage grooves 406 are blocked by the limiting plate. When the movable block 401 is placed below the mating cavity 310, the notch on the surface of the movable block 401 and the drainage grooves 406 connect the upper and lower chambers of the movable block 401. After cooling, the steam inside the loosening pipe 303 gradually condenses into water droplets due to the decrease in temperature, and then flows back to the initial position along the drainage grooves 406. At the same time, the movable block 401 is in a movable state to prevent the jet pipe 403 from being damaged by a sudden increase in pressure due to excessive high temperature and pressure, as the diameter of the jet hole 407 on the surface of the jet pipe 403 is small.

[0022] like Figures 6-8 As shown, a diversion sleeve 305 is fixedly installed on the surface of the loosening pipe 303. Multiple return pipes 306 are fixedly connected to the surface of the diversion sleeve 305, and the output end of the return pipe 306 passes through the inside of the temperature sensing cylinder 102. The input end of the return pipe 306 is fixedly connected to the loosening pipe 303.

[0023] like Figure 7 , Figure 8 , Figure 10 , Figure 11 As shown, a cone block 404 is fixedly installed at the upper end of the vibrating tube 405. The bottom end of the cone block 404 is in contact with the upper end of the jet pipe 403. Multiple jet holes 407 are formed on the outer surface of the jet pipe 403. These multiple sets of jet holes 407 are distributed circumferentially along the jet pipe 403 and are all located below the vibrating tube 405. The multiple jet holes 407 are used to eject gas from the side of the jet pipe 403 (e.g., ...). Figure 11 (as shown) A passive ring 402 is fixedly installed at the inner end of the vibrating tube 405. The position of the passive ring 402 corresponds to the jet hole 407. Several blades are fixedly installed at the inner end of the passive ring 402. When the jet hole 407 ejects gas outward, the ejected gas acts on the passive ring 402 and the blades on it, thereby driving the passive ring 402 to generate a rotation tendency, and further driving the vibrating tube 405 to rotate and shake. The bottom end of the vibrating tube 405 is equipped with a counterweight. The counterweight restricts the movement of the vibrating tube 405 when it is subjected to gas force, and it can only produce a combination of rotation and oscillation. As a result, during the rotation and swaying of the vibrating tube 405, its outer wall can form a continuous periodic knocking and disturbance on the inner wall of the loosening tube 303, thereby causing the loosening tube 303 and the internal granular raw materials to resonate.

[0024] like Figure 4 , Figure 5 As shown, an input pipe 104 is fixedly connected to the surface of the temperature sensing cylinder 102, and a heat equalization pipe 205 is fixedly installed at the inner end of the pressure pipe 4. A heat conduction pipe 5 is fixedly connected to the surface of the heat equalization pipe 205, and the heat conduction pipe 5 is detachably connected to the input pipe 104. Specifically, a pressure relief valve is installed at the input end of the pressure pipe 4. The pressure relief valve is used to regulate and limit the input pressure inside the pressure pipe 4 to prevent excessive pressure inside the feeding pipe 3 from affecting the stability of the printing material delivery or the continuity of the printing process.

[0025] The working principle of this invention is: In use, the output pipe of the pellet feeder is connected to the feeding pipe 3, and the pressurizing device is connected to the pressurizing pipe 4. Under the action of the pellet feeder, the pellet raw material continuously enters the interior of the feeding pipe 3, and under the pressure provided by the pressurizing pipe 4, the pellet raw material is conveyed downward along the feeding pipe 3. As the heating jacket 302 heats the central tube 304, the particulate material inside the central tube 304 gradually heats up and melts. The molten printing material flows into the melting cylinder 307 under the combined action of gravity and pressure, and forms a stable molten state inside the melting cylinder 307. Then it is extruded by the nozzle 103 according to the set path to complete the layer-by-layer printing. Meanwhile, the melting cylinder 307 operates at a high temperature, transferring heat outwards and heating the liquid medium inside the temperature sensing cylinder 102. Due to the temperature difference between the areas above and below the loosening pipe 303, the liquid inside the temperature sensing cylinder 102 is heated and undergoes a phase change due to thermal expansion and contraction, forming steam. The steam enters the interior of the jet pipe 403 through the gas guide pipe 308 and is finally ejected from the jet holes 407 on the surface of the jet pipe 403. The steam ejected from the jet hole 407 acts on the passive ring 402 and the blades inside it, thereby driving the passive ring 402 to rotate and further driving the vibrating tube 405 to rotate and shake. During the rotation and shaking of the vibrating tube 405, its outer wall forms a continuous periodic knocking and disturbance on the inner wall of the loosening tube 303, causing the loosening tube 303 and the granular raw material inside to resonate, thereby effectively avoiding the blockage or bridging of the granular raw material inside the feeding tube 3 and the guide plate 202, and ensuring the continuity of the feeding process. By adjusting the pressure relief valve, part of the gas pressure entering the feeding pipe 3 is used to push the printing material out of the nozzle 103, and the other part of the pressure is released through the pressure relief valve, thereby forming a continuous gas flow inside the pressurized pipe 4. Since the gas flow can carry away some heat, it avoids the situation where the temperature inside the feeding pipe 3 is too high due to the sealed state. In addition, the heat inside the temperature sensing cylinder 102 is transferred to the heat equalization pipe 205 through the input pipe 104 and diffused through the heat conduction pipe 5, so that the temperature of the temperature sensing cylinder 102 and its adjacent area is effectively regulated, thereby preventing the printing material extruded by the nozzle 103 from being too soft due to excessive temperature, which would cause the model to collapse during the printing process, thus improving the printing quality and stability.

[0026] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A feeding device for a 3D printer, comprising a coordinate positioning frame (1), characterized in that: The coordinate positioning frame (1) houses a print head (2), which is used for positioning and driving the print head (2) in three dimensions. A heat dissipation mesh (101) is fixedly installed inside the print head (2). A support cylinder (105) passes through the inner end of the heat dissipation mesh (101). The support cylinder (105) is used for installing and supporting the various functional components inside the print head (2). A temperature sensing cylinder (102) is fixedly installed at the bottom end of the support cylinder (105). A nozzle (103) is fixedly installed at the bottom of the temperature sensing cylinder (102), a central tube (304) is fixedly installed at the upper end of the temperature sensing cylinder (102), a feeding tube (3) is detachably installed at the upper end of the support cylinder (105), a pressure tube (4) is fixedly installed on the outer surface of the feeding tube (3), the pressure tube (4) is used to apply pressure to the printing material in the feeding tube (3), and a clearing device is provided inside the support cylinder (105) to periodically disturb or guide the feeding path.

2. The feeding device for a 3D printer according to claim 1, characterized in that: A guide tube (301) is fixedly installed at the inner end of the support tube (105). Multiple guide plates (202) are arranged below the feeding tube (3). The multiple guide plates (202) are arranged in a ring along the circumference of the guide tube (301). A limit ring (201) is fixedly installed on the outer surface of the feeding tube (3). Movable holes (204) are opened on the surface of the multiple guide plates (202).

3. The feeding device for a 3D printer according to claim 2, characterized in that: The bottom end of the limiting ring (201) is fixedly installed with multiple limiting rods (203), and the multiple limiting rods (203) are respectively inserted into the corresponding movable holes (204). The guide plate (202) is inserted into and movably disposed inside the guide tube (301). The central tube (304) is located inside the support tube (105). The outer surface of the central tube (304) is covered with a heating sleeve (302), which is used to heat the particulate raw material inside the central tube (304).

4. The feeding device for a 3D printer according to claim 1, characterized in that: The unblocking device includes a loosening pipe (303), which is inserted and disposed inside the central pipe (304). The central pipe (304) is connected to the spray head (103) through the melting cylinder (307). The upper end of the loosening pipe (303) extends into the interior of the guide cylinder (301) for loosening and guiding the particulate raw materials entering the central pipe (304). An annular cavity is formed between the melting cylinder (307) and the temperature sensing cylinder (102). The cavity is filled with a liquid medium, which is heated under the high temperature of the melting cylinder (307).

5. A feeding device for a 3D printer according to claim 4, characterized in that: The lower end of the loosening tube (303) passes through the interior of the melting cylinder (307). Multiple air guide tubes (308) are fixedly installed on the outer surface of the loosening tube (303). The multiple air guide tubes (308) are distributed around the loosening tube (303) in a circumferential manner. The end of the air guide tube (308) away from the loosening tube (303) extends and passes through the interior of the melting cylinder (307). The air inlet of the air guide tube (308) is exposed on the outer surface of the melting cylinder (307).

6. A feeding device for a 3D printer according to claim 5, characterized in that: The inner end of the loosening tube (303) is provided with a vibrating tube (405), and the inner end of the loosening tube (303) is provided with a mating cavity (310). A movable block (401) is slidably installed on the inner end of the mating cavity (310). An air jet pipe (403) is fixedly connected to the upper end of the movable block (401), and the air jet pipe (403) is installed inside the vibrating tube (405).

7. A feeding device for a 3D printer according to claim 6, characterized in that: A flow divider sleeve (305) is fixedly installed on the surface of the loosening pipe (303). Multiple return pipes (306) are fixedly connected to the surface of the flow divider sleeve (305). The output end of the return pipe (306) passes through the inside of the temperature sensing cylinder (102). The input end of the return pipe (306) is fixedly connected to the loosening pipe (303).

8. A feeding device for a 3D printer according to claim 6, characterized in that: A cone block (404) is fixedly installed at the upper end of the vibrating tube (405). The bottom end of the cone block (404) is in contact with the upper end of the jet pipe (403). Multiple jet holes (407) are opened on the outer surface of the jet pipe (403). Multiple sets of jet holes (407) are distributed along the circumference of the jet pipe (403).

9. A feeding device for a 3D printer according to claim 8, characterized in that: A passive ring (402) is fixedly installed at the inner end of the vibrating tube (405). The position of the passive ring (402) corresponds to the jet hole (407). Several blades are fixedly installed at the inner end of the passive ring (402). When the jet hole (407) sprays gas outward, the sprayed gas acts on the passive ring (402) and the blades on it, thereby driving the passive ring (402) to generate a rotation tendency, and further driving the vibrating tube (405) to rotate and shake.

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