A feeding device based on FDM3D printer

Abstract

The invention discloses a feeding device based on an FDM 3D printer, relates to the field of 3D printing, solves the problem that hands are easily scalded when the feeding nozzle of the existing 3D printer is unblocked, and comprises: a device shell and a heating seat, a nozzle is fixedly installed at the bottom of the heating seat, a material guide pipe is fixedly installed between the top of the nozzle and the inner side of the heating seat, a feeder is fixedly installed at the top of the material guide pipe, a heat dissipation pipe is fixedly installed on the outer side of the heat dissipation pipe, a plurality of heat dissipation fins are fixedly installed on the outer side of the heat dissipation pipe, a mounting pipe is arranged on the outer side of the mounting pipe, and an elastic steel needle is arranged on the inner side of the mounting pipe; and further comprises: a clearing mechanism, used for clearing the material guide pipe and the nozzle, the clearing mechanism is installed on the outer side of the mounting pipe; the invention clears the nozzle from top to bottom through the clearing mechanism, thereby achieving a safe clearing effect.

Description

Technical Field

[0001] The invention relates to the field of 3D printing, and in particular to a feeding device based on an FDM 3D printer. Background Art

[0002] FDM 3D printer is an additive manufacturing process, which belongs to the material extrusion series. It builds objects by selectively depositing molten material layer by layer in a predetermined path. It uses thermoplastic polymers as materials. This material is in filament form. The ABS, PLA and other filaments are heated and melted by a heating device, and then squeezed out through an extruder like squeezing toothpaste, and then accumulated layer by layer. Finally, it takes shape. It is one of the most widely used 3D printing technologies.

[0003] When using an FDM3D printer, if the plastic filament used contains impurities, has high humidity or poor quality, or the printing speed is too fast and the material fails to fully melt, and if the speed is too slow, the material may cool and solidify in the nozzle, which will cause the nozzle to be blocked. Usually, a blocking needle is inserted under the nozzle to dredge the nozzle, but the steel needle has a certain thermal conductivity, and in order to prevent damage to the nozzle, the blocking needle needs to be inserted gently. The space under the nozzle is narrow, and when manually unblocking, the staff's hands can easily touch the high-temperature nozzle. The residual plastic raw materials and blocking needles under the nozzle will cause burns to the staff's hands, which is less safe. Summary of the invention

[0004] The purpose of the present invention is to provide a feeding device based on an FDM 3D printer to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A feeding device based on an FDM 3D printer comprises: a device housing and a heating seat fixedly mounted on the inner wall of the bottom of the device housing, a nozzle extending to the bottom of the device housing is fixedly mounted on the bottom of the heating seat, a material guide pipe is fixedly mounted between the top of the nozzle and the inner side of the heating seat, a feeder is fixedly mounted on the top of the material guide pipe for extruding and feeding plastic raw materials, a heat dissipation pipe is fixedly mounted on the outer side of the heat dissipation pipe, a plurality of heat sinks are fixedly mounted on the outer side of the heat dissipation pipe, a mounting pipe in an inclined state is arranged on the outer side of the material guide pipe, an elastic steel needle is arranged on the inner side of the mounting pipe, and the elastic steel needle is made of a flexible metal material; further comprising: a clearing mechanism for clearing the material guide pipe and the nozzle, the clearing mechanism being mounted on the outer side of the mounting pipe; a scraping mechanism for causing the elastic steel needle to rotate and scrape off the plastic on the inner wall of the nozzle, the scraping mechanism being mounted inside the mounting pipe; a sealing mechanism for sealing and preventing the mounting pipe from being blocked, the sealing mechanism being mounted between the material guide pipe and the mounting pipe.

[0007] Preferably, the clearing mechanism includes a mounting rod fixedly mounted on one end of the elastic steel needle, the mounting rod is located on the inner side of the mounting tube, a clearing hole for the elastic steel needle to be inserted is provided on the outer side of the material guide tube, the elastic steel needle passes through the clearing hole and enters the material guide tube to clear the nozzle, a pulling block is installed on the end of the mounting rod away from the elastic steel needle, a sliding groove is provided on the outer side of the mounting tube for the pulling block to limit sliding, a sleeve block is fixedly mounted on the outer side of the mounting tube, a winding box is provided below the sleeve block, and a sleeve block is installed between the winding box and the pulling block There is a pull rope, and the pull rope can be stored or released by rotating the winding box. An opening for the pull rope to limit and slide is opened on the outer side of the sleeve block. A positioning frame is fixedly installed on the inner side of the device shell. The winding box is rotatably installed on the inner side of the positioning frame. A motor is fixedly installed on the inner side of the positioning frame. The motor can rotate forward and reverse. A synchronous belt is rotatably installed between the output end of the motor and the winding box. The motor can drive the winding box to rotate through the synchronous belt. A spring is fixedly installed between the pulling block and the sleeve block, which can pull the pulling block to move and reset.

[0008] Preferably, the scraping mechanism includes a roller rotatably mounted on the inner side of the mounting rod, one end of the roller is rotatably mounted with a rotating rod extending to the outside of the mounting rod, the outer diameter of the roller is larger than the outer diameter of the rotating rod, which is convenient for positioning and installing the roller, and a cavity for rotatably mounting the roller is provided inside the mounting rod, one end of the rotating rod away from the roller is fixedly connected to the pulling block, a spiral groove is provided on the outer side of the mounting rod, and a plurality of spiral strips equidistantly distributed and matching with the spiral groove are fixedly connected to the inner side of the mounting tube, and the mounting rod can move and rotate along the spiral strip through the spiral groove when moving.

[0009] Preferably, the sealing mechanism includes a swivel seat fixedly mounted on the outer side of the device housing, a positioning cylinder is fixedly mounted on the outer side of the mounting tube, two symmetrically distributed positioning rods are fixedly mounted on the outer side of the positioning cylinder, the positioning rods are rotatably mounted on the inner side of the swivel seat, and the mounting tube can be pulled to swing on the inner side of the swivel seat through the positioning cylinder and the positioning rods, two symmetrically distributed sliding rods are fixedly mounted on one end of the mounting tube away from the rotating roller, a sliding seat is arranged on the outer side of the mounting tube, and a long groove is provided on the outer side of the sliding seat for the sliding rod to limit the sliding movement The outer sides of the material guide tube and the heat dissipation tube are provided with a moving cavity for the sliding seat to limit the sliding, so that when the mounting tube swings, the sliding seat can be pulled by the sliding rod to move along the moving cavity, and a limiting plate is fixedly installed on the outer side of the sliding seat, and a spring 2 is fixedly installed between the limiting plate and the heating seat. Loosening the mounting tube can reset the limiting plate, and sliders are fixedly connected on both sides of the sliding seat. A moving groove for the sliding seat to limit the sliding is provided in the moving cavity of the heat dissipation tube, which provides a guide for the movement of the sliding seat, so that the sliding seat can seal the clearing hole.

[0010] Preferably, a guide block is fixedly mounted on one end of the pull block away from the pull rope, and a guide groove for limiting sliding of the guide block is provided on the outer side of the mounting tube, thereby improving the stability of the movement of the pull block.

[0011] Preferably, an insertion rod is fixedly mounted on a side of the pull block away from the mounting rod, and a through hole for limiting insertion of the insertion rod is formed on the outer side of the mounting tube.

[0012] Preferably, the inner side of the slide seat is an arc-shaped inclined surface structure, which provides limitation and support for the installation pipe.

[0013] Preferably, an anti-slip sleeve is fixedly connected to the outer side of the mounting tube to facilitate the user to pull the mounting tube.

[0014] Preferably, a sealing plate is fixedly installed on the side of the slide seat away from the limit plate, the sealing plate contacts the inner wall of the moving cavity of the guide tube, the size of the sealing plate is larger than the size of the clearing hole, and is used to seal the clearing hole.

[0015] Preferably, a baffle is provided above the limit plate, and a guide rod slidingly penetrating the limit plate is fixedly installed between the bottom of the baffle and the heating seat to improve the stability of the movement of the limit plate.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention uses a clearing mechanism to enable the elastic steel needle to be obliquely inserted into the interior of the material guide tube. The elasticity of the elastic steel needle is utilized to enable the steel needle to stick to the inner wall of the material guide tube and enter the interior of the nozzle, so that the elastic steel needle can clear the nozzle. The nozzle is cleared from top to bottom, thereby solving the problem of workers' hands being easily scalded when the elastic steel needle is used to clear the blockage, thereby achieving a safe clearing effect.

[0018] The scraping mechanism of the present invention can make the elastic steel needle rotate when inserted into the nozzle, so that the elastic steel needle can be bent to pass through the opening of the nozzle and scrape and clean the plastic residue on the inner wall of the nozzle, thereby improving the efficiency of clearing blockage.

[0019] The present invention can seal the clearing hole through the sealing mechanism when the guide pipe is heating and feeding the plastic raw material to prevent the plastic raw material from entering the installation pipe, and open the clearing hole when clearing the blockage, thereby achieving the effect of facilitating clearing and sealing feeding. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the structure of the heating seat and the device shell in the present invention;

[0022] Figure 3 It is a schematic diagram of the positioning frame and the rotating seat structure in the present invention;

[0023] Figure 4 It is a schematic diagram of the structure of the mounting tube and the mounting rod in the present invention;

[0024] Figure 5 for Figure 4 Schematic diagram of the enlarged structure of the middle A area;

[0025] Figure 6 It is a schematic diagram of the structure of the transfer rod and the roller in the present invention;

[0026] Figure 7 It is a schematic diagram of the structure of the sliding seat and the sliding block in the present invention;

[0027] Figure 8 It is a schematic diagram of the limit plate and baffle structure in the present invention.

[0028] In the figure: 1. device housing; 2. heating seat; 3. clearing mechanism; 4. scraping mechanism; 5. sealing mechanism; 6. nozzle; 7. material guide pipe; 8. feeder; 9. heat pipe; 10. heat sink; 11. mounting pipe; 12. elastic steel needle; 13. mounting rod; 14. clearing hole; 15. pull block; 16. sleeve block; 17. winding box; 18. pull rope; 19. positioning frame; 20. motor; 21. synchronous belt; 22. spring one; 23. roller; 24. rotating rod; 25. spiral groove; 26. spiral strip; 27. rotating seat; 28. positioning rod; 29. ​​slide rod; 30. slide seat; 31. limit plate; 32. spring two; 33. slider; 34. positioning cylinder; 35. plug rod; 36. anti-slip sleeve; 37. sealing plate; 38. baffle; 39. guide rod; 40. guide block. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative inspiration are within the scope of protection of the present invention.

[0030] Example 1: Please refer to Figure 1-Figure 8 The feeding device based on FDM3D printer shown in the figure comprises a device housing 1 and a heating seat 2 fixedly mounted on the inner wall of the bottom of the device housing 1, a nozzle 6 extending to the bottom of the device housing 1 is fixedly mounted on the bottom of the heating seat 2, a material guide pipe 7 is fixedly mounted between the top of the nozzle 6 and the inner side of the heating seat 2, a feeder 8 is fixedly mounted on the top of the material guide pipe 7 for extruding and feeding the plastic raw material, a heat dissipation pipe 9 is fixedly mounted on the outside of the heat dissipation pipe 9, a plurality of heat sinks 10 are fixedly mounted on the outside of the heat dissipation pipe 9, an inclined mounting pipe 11 is arranged on the outside of the material guide pipe 7, and the mounting pipe 11 is fixedly mounted on the outside of the material guide pipe 7. 1 is provided with an elastic steel needle 12 on the inner side, the elastic steel needle 12 is made of flexible metal, the temperature of the nozzle 6 is heated to between 160-180 degrees, and the elastic steel needle 12 will not deform in this temperature range; it also includes: a clearing mechanism 3, used to clear the guide pipe 7 and the nozzle 6, the clearing mechanism 3 is installed on the outside of the mounting tube 11; a scraping mechanism 4, used to make the elastic steel needle 12 rotate and scrape the plastic on the inner wall of the nozzle 6, the scraping mechanism 4 is installed inside the mounting tube 11; a sealing mechanism 5, used to seal and prevent the mounting tube 11 from blocking, the sealing mechanism 5 is installed between the guide pipe 7 and the mounting tube 11.

[0031] The clearing mechanism 3 includes a mounting rod 13 fixedly mounted on one end of an elastic steel needle 12, the mounting rod 13 is located on the inner side of the mounting tube 11, a clearing hole 14 for the elastic steel needle 12 to be inserted is provided on the outer side of the guide tube 7, the elastic steel needle 12 passes through the clearing hole 14 and enters the guide tube 7 to clear the nozzle 6, a pull block 15 is installed on the end of the mounting rod 13 away from the elastic steel needle 12, a slide groove for the pull block 15 to limit the sliding of the pull block 15 is provided on the outer side of the mounting tube 11, a sleeve block 16 is fixedly mounted on the outer side of the mounting tube 11, a winding box 17 is provided below the sleeve block 16, a pull rope 18 is installed between the winding box 17 and the pull block 15, The dynamic winding box 17 can store or release the pull rope 18. An opening for the pull rope 18 to slide in a limited position is provided on the outer side of the sleeve block 16. A positioning frame 19 is fixedly installed on the inner side of the device housing 1. The winding box 17 is rotatably installed on the inner side of the positioning frame 19. A motor 20 is fixedly installed on the inner side of the positioning frame 19. The motor 20 can rotate forward and reverse. A synchronous belt 21 is rotatably installed between the output end of the motor 20 and the winding box 17. The motor 20 can drive the winding box 17 to rotate through the synchronous belt 21. A spring 22 is fixedly installed between the pull block 15 and the sleeve block 16, which can pull the pull block 15 to move and reset.

[0032] Starting the motor 20 can drive the winding box 17 to rotate through the synchronous belt 21, so that the winding box 17 pulls the pull block 15 to move along the slide groove on the mounting tube 11, and the pull block 15 pushes the mounting rod 13 to move along the inner wall of the mounting tube 11, and utilizes the elastic potential energy of the spring 12 to enable the mounting rod 13 to smoothly insert the elastic steel needle 12 into the clearing hole 14 of the guide tube 7, and utilizes the flexibility of the elastic steel needle 12 to dredge the plastic residue in the nozzle 6, and uses the top-down method to clear the nozzle 6. When the elastic steel needle 12 passes through the opening of the nozzle 6, the motor 20 drives the winding box 17 to rotate in the opposite direction through the synchronous belt 21, and utilizes the resilience of the spring 12 to pull the pull block 15 to reset, thereby making the elastic steel needle 12 move back and forth in the nozzle 6, solving the problem that the elastic steel needle 12 is easy to cause scalds to the hands of the staff when clearing the blockage, thereby achieving the effect of safe clearing the blockage.

[0033] The scraping mechanism 4 includes a roller 23 rotatably mounted on the inner side of the mounting rod 13, one end of the roller 23 is rotatably mounted with a rotating rod 24 extending to the outer side of the mounting rod 13, the outer diameter of the roller 23 is larger than the outer diameter of the rotating rod 24, so as to facilitate the positioning and installation of the roller 23, the interior of the mounting rod 13 is provided with a cavity for the rotating roller 23 to be rotatably mounted, the end of the rotating rod 24 away from the roller 23 is fixedly connected to the pull block 15, the outer side of the mounting rod 13 is provided with a spiral groove 25, the inner side of the mounting tube 11 is fixedly connected with a plurality of spiral strips 26 equidistantly distributed and matched with the spiral groove 25, and the mounting rod 13 can move and rotate along the spiral strips 26 through the spiral groove 25 when moving;

[0034] When the pulling block 15 moves, the rotating roller 23 is driven to move through the rotating rod 24, so that the rotating roller 23 pushes the mounting rod 13 to move. When the mounting rod 13 moves along the inner side of the mounting tube 11, the spiral groove 25 on the mounting rod 13 cooperates with the spiral strip 26 on the inner side of the mounting tube 11, so that the mounting rod 13 is in a rotating state when moving. The mounting rod 13 drives the elastic steel needle 12 to rotate and move synchronously, so that the elastic steel needle 12 is inserted into the nozzle 6 in a rotating state, which is convenient for the elastic steel needle 12 to shape, and the elastic steel needle 12 can rotate along the inner side of the nozzle 6 to scrape off the residual plastic raw material, thereby improving the cleaning efficiency of the nozzle 6.

[0035] The sealing mechanism 5 includes a rotating seat 27 fixedly mounted on the outside of the device housing 1, a positioning cylinder 34 is fixedly mounted on the outside of the mounting tube 11, two symmetrically distributed positioning rods 28 are fixedly mounted on the outside of the positioning cylinder 34, and the positioning rods 28 are rotatably mounted on the inside of the rotating seat 27. The mounting tube 11 can be pulled to swing on the inside of the rotating seat 27 through the positioning cylinder 34 and the positioning rods 28. Two symmetrically distributed sliding rods 29 are fixedly mounted on one end of the mounting tube 11 away from the roller 23. A sliding seat 30 is arranged on the outside of the mounting tube 11, and a long strip groove for the sliding rod 29 to limit the sliding of the sliding rod 29 is opened on the outside of the sliding seat 30. The outer sides of the tube 7 and the heat dissipation tube 9 are provided with a movable cavity for the slide seat 30 to limit the sliding movement, so that when the mounting tube 11 swings, the slide seat 30 can be pulled by the slide rod 29 to move along the movable cavity, and a limit plate 31 is fixedly installed on the outer side of the slide seat 30, and a spring 2 32 is fixedly installed between the limit plate 31 and the heating seat 2. Loosening the mounting tube 11 can reset the limit plate 31. Slide blocks 33 are fixedly connected to both sides of the slide seat 30. A movable groove for the slide block 33 to limit the sliding movement is provided in the movable cavity of the heat dissipation tube 9, which provides a guide for the movement of the slide seat 30, so that the slide seat 30 can seal the clearing hole 14;

[0036] The user can pull one end of the mounting tube 11 to swing upward, so that the mounting tube 11 rotates upward on the inner side of the swivel seat 27 with the positioning cylinder 34 as the fulcrum and the positioning rod 28. The two sliding bars 29 on the mounting tube 11 pull the sliding seat 30 to move downward along the movable cavity on the heat dissipation tube 9 and the material guide tube 7, so that the sliding seat 30 drives the two sliding blocks 33 to move along the movable groove on the heat dissipation tube 9. The sliding seat 30 presses the spring 2 32 through the limit plate 31 to align the mounting tube 11 with the clearing hole 14 on the material guide tube 7, and the elastic steel needle 12 can enter the clearing hole 14 to clear the nozzle 6. After the clearing is completed, the user releases the mounting tube 11 and uses the rebound force of the spring 2 32 to move the sliding seat 30 upward and reset, so that the sliding seat 30 seals the clearing hole 14 to prevent the plastic raw material from entering the mounting tube 11 from the clearing hole 14, thereby achieving the effect of facilitating clearing and sealing material feeding.

[0037] Working principle: First, the user pulls one end of the mounting tube 11 to swing upward, so that the mounting tube 11 rotates upward inside the rotating seat 27 with the positioning rod 28 as the fulcrum through the positioning tube 34. The two slide bars 29 on the mounting tube 11 pull the slide seat 30 to move downward along the moving cavity on the heat dissipation tube 9 and the guide tube 7, so that the slide seat 30 drives the two sliders 33 to move along the moving groove on the heat dissipation tube 9. The slide seat 30 presses the spring 2 32 through the limit plate 31, so that the slide seat 30 smoothly moves the clearing hole 14 The user starts the motor 20, and the motor 20 drives the winding box 17 to rotate synchronously through the synchronous belt 21. The winding box 17 pulls the pull block 15 to move along the slide groove on the mounting tube 11 and compresses the spring 1 22. The pull block 15 drives the roller 23 to move through the rotating rod 24, so that the roller 23 pushes the mounting rod 13 to move, so that the spiral groove 25 on the mounting rod 13 cooperates with the spiral strip 26 inside the mounting tube 11, so that the mounting rod 13 When the elastic steel needle 12 passes through the opening of the nozzle 6, the motor 20 drives the winding box 17 to rotate in the opposite direction through the synchronous belt 21, and the pull block 15 is pulled back by the rebound force of the spring 1 22 to reset the pull block 15, thereby making the elastic steel needle 12 reciprocate in the nozzle 6, and the nozzle 6 can be quickly cleared. Finally, the elastic steel needle 12 is reset from the nozzle 6 to the mounting tube 11, and the user releases the mounting tube 11 and uses the rebound force of the spring 2 32 to reset the slide seat 30 upward to seal the clearing hole 14, thereby achieving the effect of safe clearing and improving the efficiency of clearing the nozzle 6.

[0038] Example 2: Please refer to Figure 4-Figure 6 The present embodiment further explains the first embodiment. The pull block 15 shown in the figure is fixedly installed with a guide block 40 at one end away from the pull rope 18, and a guide groove for limiting the sliding of the guide block 40 is provided on the outer side of the mounting tube 11, so as to improve the stability of the movement of the pull block 15. The pull block 15 is fixedly installed with an insertion rod 35 on the side away from the mounting rod 13, and a through hole is provided on the outer side of the mounting tube 11 for limiting the insertion of the insertion rod 35.

[0039] In this embodiment: when the spring 22 pulls the pull block 15 to reset, it can drive the guide block 40 to move synchronously, thereby improving the stability of the movement of the pull block 15, and drive the insertion rod 35 to insert into the through hole on the mounting tube 11. The rod-shaped tool can be pressed against the insertion rod 35 to push the mounting rod 13 to move, making it easier to insert the elastic steel needle 12 into the nozzle 6 in more ways.

[0040] Example 3: Please refer to Figure 2-Figure 8 , this embodiment further explains other embodiments. The inner side of the slide seat 30 shown in the figure is an arc-shaped inclined surface structure, which provides limitation and support for the mounting tube 11. The outer side of the mounting tube 11 is fixedly connected with an anti-slip sleeve 36, which is convenient for the user to pull the mounting tube 11. A sealing plate 37 is fixedly installed on the side of the slide seat 30 away from the limiting plate 31. The sealing plate 37 contacts the inner wall of the moving cavity of the guide tube 7. The size of the sealing plate 37 is larger than the size of the clearing hole 14, which is used to block and seal the clearing hole 14. A baffle plate 38 is arranged above the limiting plate 31, and a guide rod 39 that slides through the limiting plate 31 is fixedly installed between the bottom of the baffle plate 38 and the heating seat 2 to improve the stability of the movement of the limiting plate 31.

[0041] In this embodiment: the user can pull the mounting tube 11 to rotate along the inner side of the rotating seat 27 through the anti-slip sleeve 36, and use the inclined surface on the inner side of the slide seat 30 to provide a limit for the rotation of the mounting tube 11, so as to facilitate the alignment of the mounting tube 11 with the clearing hole 14 on the guide tube 7, and when the mounting tube 11 is reset, the guide rod 39 on the baffle plate 38 can improve the stability of the movement of the limit plate 31, so that the slide seat 30 can move upward smoothly, drive the sealing plate 37 to move synchronously, seal the clearing hole 14, prevent the plastic raw material from being discharged from the clearing hole 14, and improve the sealing of the clearing hole 14.

[0042] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A feeding device based on FDM 3D printer, characterized in that: include: The device shell and the heating seat fixedly mounted on the inner wall of the bottom of the device shell, the bottom of the heating seat is fixedly mounted with a nozzle extending to the bottom of the device shell, a material guide pipe is fixedly mounted between the top of the nozzle and the inner side of the heating seat, a material feeder is fixedly mounted on the top of the material guide pipe, a heat dissipation pipe is fixedly mounted on the outside of the material guide pipe, a plurality of heat sinks are fixedly mounted on the outside of the heat dissipation pipe, an inclined mounting pipe is arranged on the outside of the material guide pipe, and an elastic steel needle is arranged on the inside of the mounting pipe; Also includes: A clearing mechanism is used to clear the material guide tube and the nozzle. The clearing mechanism is installed on the outside of the installation tube. The clearing mechanism includes a mounting rod fixedly installed on one end of the elastic steel needle. The mounting rod is located on the inner side of the installation tube. A clearing hole for the elastic steel needle to be inserted is provided on the outside of the material guide tube. A pull block is installed on the end of the mounting rod away from the elastic steel needle. A slide groove for the pull block to limit the sliding is provided on the outside of the installation tube. A sleeve block is fixedly installed on the outside of the installation tube. A winding box is provided below the sleeve block. A pull rope is installed between the winding box and the pull block. An opening for the pull rope to limit the sliding is provided on the outside of the sleeve block. A spring is fixedly installed between the pull block and the sleeve block. A scraping mechanism is used to make the elastic steel needle rotate and scrape the plastic on the inner wall of the nozzle. The scraping mechanism is installed inside the mounting tube. The scraping mechanism includes a roller rotatably installed on the inner side of the mounting rod. A rotating rod extending to the outer side of the mounting rod is rotatably installed at one end of the roller. The outer diameter of the roller is larger than the outer diameter of the rotating rod. A cavity for rotating the roller is provided inside the mounting rod. One end of the rotating rod away from the roller is fixedly connected to the pull block. A spiral groove is provided on the outer side of the mounting rod. A plurality of spiral strips that are evenly distributed and matched with the spiral groove are fixedly connected to the inner side of the mounting tube. A sealing mechanism is used to seal and prevent the installation tube from being blocked. The sealing mechanism is installed between the material guide tube and the installation tube. The sealing mechanism includes a swivel seat fixedly installed on the outside of the device shell. A positioning cylinder is fixedly installed on the outside of the installation tube. Two symmetrically distributed positioning rods are fixedly installed on the outside of the positioning cylinder. The positioning rod is rotatably installed on the inner side of the swivel seat. Two symmetrically distributed sliding rods are fixedly installed on the end of the installation tube away from the roller. A sliding seat is arranged on the outside of the installation tube. A long groove is provided on the outside of the sliding seat for the sliding rod to limit the sliding movement. A movable cavity is provided on the outside of the material guide tube and the heat dissipation tube for the sliding seat to limit the sliding movement. A limiting plate is fixedly installed on the outside of the sliding seat. A spring 2 is fixedly installed between the limiting plate and the heating seat. Slide blocks are fixedly connected on both sides of the sliding seat. A movable groove is provided in the movable cavity of the heat dissipation tube for the sliding block to limit the sliding movement.

2. A feeding device based on FDM 3D printer according to claim 1, characterized in that: The blockage clearing mechanism also includes a positioning frame fixedly installed on the inner side of the device shell, a winding box rotatably installed on the inner side of the positioning frame, a motor is fixedly installed on the inner side of the positioning frame, and a synchronous belt is rotatably installed between the output end of the motor and the winding box.

3. A feeding device based on FDM 3D printer according to claim 2, characterized in that: A guide block is fixedly mounted on one end of the pull block away from the pull rope, and a guide groove for limiting sliding of the guide block is arranged on the outer side of the mounting tube.

4. A feeding device based on FDM 3D printer according to claim 2, characterized in that: A plugging rod is fixedly mounted on one side of the pull block away from the mounting rod, and a through hole for limiting and inserting the plugging rod is provided on the outer side of the mounting tube.

5. The feeding device based on FDM 3D printer according to claim 1, characterized in that: The inner side of the sliding seat is an arc-shaped inclined surface structure.

6. A feeding device based on FDM 3D printer according to claim 1, characterized in that: The outer side of the mounting tube is fixedly connected with an anti-slip sleeve.

7. The feeding device based on FDM 3D printer according to claim 1, characterized in that: A sealing plate is fixedly mounted on one side of the slide seat away from the limiting plate. The sealing plate contacts the inner wall of the moving cavity of the material guide tube. The size of the sealing plate is larger than the size of the clearing hole.

8. The feeding device based on FDM 3D printer according to claim 1, characterized in that: A baffle is arranged above the limit plate, and a guide rod which slides through the limit plate is fixedly installed between the bottom of the baffle and the heating seat.

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