A wire feeding mechanism for a 3D printer used in ship hull production

Abstract

This invention relates to the field of 3D printing technology, and more particularly to a filament feeding mechanism for a 3D printer used in the production of ship hulls. It includes: a main body with a Y-shaped groove inside; a cover plate detachably connected to the main body and a guide tube fixed thereto; two symmetrically distributed mileage wheels mounted on the main body near the Y-shaped groove, which rotate with the movement of the corresponding filament and sense the speed of the filament; a swing frame rotatably connected to the main body; and a power wheel and a motor mounted on the swing frame. This invention senses the movement of the filament through the mileage wheels. When the filament is used up, the mileage wheel stops rotating due to loss of contact with the filament. If the motor is still running, it indicates that the filament is exhausted. At this point, the power wheel is aligned with the other mileage wheel, and new filament is fed. This allows for automatic continuity of old and new filament, improving printing efficiency, maintaining the printing quality of the ship hull, and reducing the probability of material changes affecting the quality of the ship hull.

Description

Technical Field

[0001] This invention relates to the field of 3D printing technology, and more particularly to a filament feeding mechanism for a 3D printer used in the production of marine vessel hulls. Background Technology

[0002] 3D printing technology, also known as additive manufacturing, has developed based on the continuous advancement of digital technology and new materials technology. This technology uses 3D model files as a basis and constructs objects by printing layer by layer, realizing the transformation from digital design to physical manufacturing. 3D printed ship hulls are an innovative method of manufacturing seagoing vessels directly by stacking materials (such as plastics, composite materials, or metals) layer by layer using additive manufacturing technology. Compared with traditional shipbuilding processes, 3D printed ship hulls have advantages such as high design freedom, short production cycle, high material utilization rate, and lower cost.

[0003] During 3D printing, there may be situations where a single roll of filament runs out before the printed artwork is finished. In this case, the 3D printer needs to be paused, the remaining filament in the nozzle needs to be cleaned, and the end of a new filament needs to be inserted into the nozzle. However, in this situation, one needs to stay near the 3D printer for a long time to pause the printer and replace the filament in time when it runs out, which results in low printing efficiency. At the same time, pausing to replace the filament during printing will cause bulges on the surface of the printed object (i.e., the joint between the two filament sections), affecting the quality of the printed artwork. Summary of the Invention

[0004] This invention provides a filament feeding mechanism for a 3D printer used in the production of ship hulls, in order to overcome the shortcomings of low printing efficiency and poor hull quality in 3D printers when printing ship hulls.

[0005] The technical solution of the present invention is as follows: a filament feeding mechanism for a 3D printer used in the production of marine vessel hulls, comprising: a main body, wherein a Y-shaped groove is provided inside the main body, a cover plate is detachably connected to the main body and a guide tube is fixedly connected thereto, the Y-shaped groove and the guide tube are both used to provide a path for the movement of filament, two symmetrically distributed mileage wheels are installed on the main body near the Y-shaped groove, the mileage wheels are used to rotate with the movement of the corresponding filament and to sense the movement speed of the filament, a swing frame is rotatably connected to the main body, a power wheel is rotatably connected to the swing frame and a motor is installed thereon, the motor is used to provide power to the power wheel, the power wheel and one of the mileage wheels together clamp the filament, and a power component for changing the position of the swing frame is provided on the main body.

[0006] Furthermore, the power assembly includes: a bidirectional electromagnetic push rod, mounted on the main body, with an arched frame fixedly connected to the telescopic end of the bidirectional electromagnetic push rod, and a first sliding groove provided on the swing frame, the arched frame passing through the main body and sliding within the first sliding groove.

[0007] Furthermore, the main body is slidably connected to a mounting rod, and the swing frame is provided with a second sliding groove near the mounting rod. The mounting rod slides within the second sliding groove and is limited in movement. Both ends of the mounting rod are fixedly connected to a cutter, which is used to cut the wire.

[0008] Furthermore, the Y-shaped groove consists of two symmetrically distributed material storage grooves and a confluence groove, with both cutters located between the two material storage grooves.

[0009] Furthermore, the Y-shaped groove has a guide slope near the confluence groove, and the main body has a storage groove that communicates with both storage grooves on the Y-shaped groove. The guide slope is used to move the broken wire end into the storage groove.

[0010] Furthermore, the output shaft of the motor is fixedly connected to a transmission disc, and a torsion spring is fixedly connected between the transmission disc and the power wheel.

[0011] Furthermore, the main body is fixedly connected to a fixed sleeve, which communicates with the confluence groove of the Y-shaped groove. A movable sleeve is slidably connected to the fixed sleeve, and a sensor is installed on the movable sleeve. An installation cylinder is fixedly connected to the end of the movable sleeve away from the fixed sleeve, and the installation cylinder slides within the main body. A spring is fixedly connected between the side of the installation cylinder away from the fixed sleeve and the main body. A bulletproof cylinder, a fixed bulletproof cylinder, and an electric heating ring are fixedly connected inside the installation cylinder. The electric heating ring is located between the bulletproof cylinder and the fixed bulletproof cylinder. The bulletproof cylinder is used to block the movement of new filament, the fixed bulletproof cylinder is used to fix the end of the old filament, and the electric heating ring is used to heat the old filament. Both the bulletproof cylinder and the fixed bulletproof cylinder contain fluids with high coefficients of thermal expansion. Both the bulletproof cylinder and the fixed bulletproof cylinder contain heating modules. A sliding cylinder is fixedly connected to the side of the installation cylinder away from the fixed sleeve, and the sliding cylinder is slidably connected to the conduit.

[0012] Furthermore, both the bulletproof tube and the solid bullet tube are coated with a heat-insulating coating.

[0013] Furthermore, the inner side of the fixed cartridge is fixed with a ring of evenly distributed guide strips, all of which are used together to guide the connection of the new and old wires.

[0014] Furthermore, the main body is fixedly connected with a guide spring, which is located at the connection between two material storage grooves and a confluence groove on the Y-shaped groove. The guide spring is used to guide the filament in the material storage grooves to move into the confluence groove.

[0015] In summary, this application includes at least one of the following beneficial technical effects: The present invention senses the movement of the filament by using a mileage wheel. When the filament is used up, the mileage wheel stops rotating because it loses contact with the filament. If the motor is still running, it means that the filament is exhausted. At this time, the power wheel is adjusted to correspond with another mileage wheel, and new filament is conveyed. In this way, the old and new filaments are automatically connected, improving printing efficiency, maintaining the printing effect of the hull, and reducing the probability of material replacement affecting the quality of the hull.

[0016] By swinging the swing frame, the cutter moves and cuts the corresponding filament. This not only allows the end of the old filament to be cut when the new and old filaments are joined, ensuring the flatness of the old filament end and reducing the probability of the new and old filaments getting stuck in the guide tube, but also enables the controllable replacement of filaments of different colors, improving the efficiency of printing work.

[0017] The old filament is heated by an electric heating ring, which melts the old filament and allows it to connect and adhere with the end of the new filament. This reduces the probability of gaps appearing at the connection point between the old and new filaments during movement, allowing the old and new filaments to continuously enter the print head, ensuring printing continuity and print quality. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the mileage wheel and power wheel of the present invention; Figure 3 This is a three-dimensional structural diagram of the main body and the bow-shaped frame of the present invention; Figure 4 This is a three-dimensional structural diagram of the swing frame and mounting rod of the present invention; Figure 5 This is a three-dimensional structural cross-sectional view of the swing frame and drive wheel of the present invention; Figure 6 This is a three-dimensional structural cross-sectional view of the movable sleeve and mounting cylinder of the present invention; Figure 7 This is a three-dimensional structural cross-sectional view of the mounting cylinder and the fixed cartridge of the present invention; Figure 8 This is an exploded view of the bullet-stopping cylinder, the solid bullet cylinder, and the electric heating ring of the present invention.

[0019] Icons: 1. Main body, 101. Y-shaped groove, 102. Guide slope, 103. Storage slot, 2. Cover plate, 3. Conduit, 4. Mileage wheel, 5. Swing frame, 501. First slide groove, 502. Second slide groove, 6. Power wheel, 7. Motor, 8. Bidirectional electromagnetic push rod, 9. Bow-shaped frame, 10. Mounting rod, 11. Cutter, 12. Transmission disc, 13. Torsion spring, 14. Fixed sleeve, 15. Moving sleeve, 16. Sensor, 17. Mounting cylinder, 18. Spring, 19. Bulletproof cylinder, 20. Fixed bulletproof cylinder, 21. Electric heating ring, 22. Heating module, 23. Sliding cylinder, 24. Guide spring strip, 25. Guide spring piece. Detailed Implementation

[0020] 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.

[0021] Example 1: This example provides a filament feeding mechanism for a 3D printer used in the production of ship hulls, in order to solve the problems of low printing efficiency and reduced hull quality in existing 3D printers when printing ship hulls.

[0022] It should be noted that this device is placed flat during actual use.

[0023] It is important to understand that traditional printers have a transmission module at the printhead to control the speed of the filament; in this article, the filament currently in use is referred to as the old filament, and the filament to be replenished later is referred to as the new filament, and the 3D printer has a control terminal.

[0024] See Figures 1 to 3A filament feeding mechanism for a 3D printer used in the production of marine vessel hulls includes: a main body 1, in which a Y-shaped groove 101 is provided, the Y-shaped groove 101 consisting of two symmetrically distributed material storage grooves and a confluence groove, wherein each material storage groove can accommodate the end of a filament; a cover plate 2 is detachably connected to the main body 1 and a guide tube 3 is fixedly connected thereto, the guide tube 3 communicating with the confluence groove of the Y-shaped groove 101, the guide tube 3 being an existing part, and the inner diameter of the guide tube 3 being larger than the diameter of the filament to reduce the frictional resistance when the filament moves within the guide tube 3; the cover plate 2 is used to cover the Y-shaped groove 101; the Y-shaped groove 101 and the guide tube 3... Both are used to provide a path for the movement of the filament. Two symmetrically distributed mileage wheels 4 are installed on the main body 1 near the Y-shaped groove 101. The two mileage wheels 4 are inserted into the corresponding storage grooves. The mileage wheels 4 are used to rotate with the movement of the corresponding filament and sense the movement speed of the filament. The mileage wheels 4 can transmit the real-time movement speed of the filament to the control terminal. The main body 1 is rotatably connected to a swing frame 5. The swing frame 5 is rotatably connected to a power wheel 6 and a motor 7 is installed. The motor 7 is used to provide power to the power wheel 6. The power wheel 6 and any one of the mileage wheels 4 jointly clamp the filament. The main body 1 is provided with a power component for changing the position of the swing frame 5.

[0025] The above setup enables the mileage wheel 4 to sense the movement of the filament. When the filament is used up, the mileage wheel 4 stops rotating because it loses contact with the filament. If the motor 7 is still running, it means that the filament is exhausted. At this time, the power wheel 6 is adjusted to correspond with another mileage wheel 4, and new filament is fed. In this way, the old and new filaments are automatically connected, improving printing efficiency, maintaining the hull printing effect, and reducing the probability of material changes affecting the quality of the hull.

[0026] See Figures 2 to 5 The power assembly includes: a bidirectional electromagnetic push rod 8, which is mounted on the main body 1. The telescopic end of the bidirectional electromagnetic push rod 8 is fixedly connected to an arc-shaped frame 9. The bidirectional electromagnetic push rod 8 is used to control the movement of the arc-shaped frame 9 in the left and right directions. A first sliding groove 501 is provided on the swing frame 5. The arc-shaped frame 9 passes through the main body 1 and slides within the first sliding groove 501.

[0027] The above setup enables the use of the bidirectional electromagnetic push rod 8 to provide power for the swing of the swing frame 5, which not only enables the automatic connection of new and old wire materials, but also enables the control of the extrusion pressure of the power wheel 6 on the wire material by controlling the current magnitude.

[0028] See Figure 4 and Figure 5The main body 1 is slidably connected to the mounting rod 10 on the left and right. The swing frame 5 is provided with a second sliding groove 502 near the mounting rod 10. The mounting rod 10 is limited and slids within the second sliding groove 502. Both ends of the mounting rod 10 are fixedly connected to a cutter 11, which is used to cut the wire. Both cutters 11 are located between two storage grooves. When the wire is bent in the storage groove, it adheres to the side wall of the storage groove due to its own elasticity. In this way, when the wire is cut by the cutter 11, the side wall of the storage groove provides support for the wire, thereby improving the reliability of the wire cutting.

[0029] The above setup enables the swing of the swing frame 5 to move the cutter 11 and cut the corresponding filament. This not only allows the end of the old filament to be cut when the new and old filaments are joined, ensuring the flatness of the end of the old filament and reducing the probability of the new and old filaments getting stuck in the guide tube 3, but also enables the controllable replacement of filaments of different colors, improving the efficiency of printing work.

[0030] See Figure 2 and Figure 4 The Y-shaped groove 101 has a guide slope 102 at the front of its storage groove. The guide slope 102 is used to guide the movement of the broken wire end, so as to attach... Figure 2 Taking the storage groove on the right side as an example, the horizontal height of the guide slope 102 gradually decreases from the front right to the rear left. The main body 1 is provided with a storage groove 103 that is connected to the two storage grooves on the Y-shaped groove 101. The guide slope 102 is used to guide the broken wire end to roll into the storage groove 103 by gravity.

[0031] Printing process: Insert two filaments into the two storage slots of the Y-shaped groove 101 respectively. During the movement, the end of the filament on the right will squeeze the power wheel 6, causing the power wheel 6 to drive the swing frame 5 and the bow frame 9 to move to the left. Finally, the filament passes between the power wheel 6 and the right mileage wheel 4. Meanwhile, the end of the filament on the left moves along the storage slot and eventually contacts the cutter 11 on the left. At this point, the filament can no longer move and remains stationary.

[0032] When printing begins, motor 7 is started, which drives the power wheel 6 to rotate clockwise. The power wheel 6 and the right-side mileage wheel 4 together squeeze the right-side filament and move it, so that the end of the filament moves along the material storage groove of the Y-shaped groove 101 into the confluence groove and enters the guide tube 3. Finally, it moves along the guide tube 3 to the nozzle and printing begins. During this process, the right-side mileage wheel 4 always rotates with the movement of the filament and records the speed of the filament movement.

[0033] After the old filament loses contact with the mileage wheel 4 and the power wheel 6 on the right, the mileage wheel 4 stops rotating, while the motor 7 continues to run and the power wheel 6 continues to rotate. At this time, the printer's control terminal can determine that the old filament is exhausted and needs to be replaced (the remaining old filament continues to move into the printhead under the drive of the transmission module). The control terminal controls the bow frame 9 to move to the left through the bidirectional electromagnetic push rod 8. The bow frame 9 drives the swing frame 5 to swing counterclockwise. The swing frame 5 drives the power wheel 6 and the motor 7 to swing together. At the same time, the swing frame 5 drives the mounting rod 10 to move to the right. The mounting rod 10 drives the cutter 11 to move to the right and cuts off the end of the old filament, ensuring that the end of the old filament is flat. This reduces the probability of the ends of the new and old filaments intersecting and getting stuck in the guide tube 3.

[0034] During the swing of the swing frame 5, the motor 7 drives the power wheel 6 to rotate in the opposite direction. Eventually, the power wheel 6 comes into contact with the new filament and moves together with the mileage wheel 4 on the left. Since the end of the new filament is in contact with the cutter 11 when it starts to move, and the end of the old filament is also in contact with the cutter 11, when both the new and old filaments enter the confluence groove of the Y-shaped groove 101, the ends of the new and old filaments will come into contact with each other, thus completing the splicing of the filaments.

[0035] When this device is used to change different colored filaments, the two colored filaments are inserted into the two storage slots of the Y-shaped groove 101 respectively, and printing begins. When a change is needed, the above steps are repeated, and the old colored filament is cut off by the cutter 11, while the new colored filament is automatically connected, thus realizing the switching of different colored filaments.

[0036] Example 2 is an optimization based on Example 1.

[0037] See Figure 2 and Figure 5 The output shaft of motor 7 is fixedly connected to a transmission disc 12, and a torsion spring 13 is fixedly connected between the transmission disc 12 and the power wheel 6.

[0038] The transmission between the transmission disc 12 and the drive wheel 6 is achieved through the torsion spring 13. The condition of the filament can be determined by the speed difference between the transmission disc 12 and the drive wheel 6. For example, when switching filaments, the speed of the output shaft of the motor 7 is actively increased so that the initial moving speed of the new filament is greater than that of the old filament. This ensures that the ends of the two filaments can be connected and there is mutual squeezing force. After the ends of the two filaments are connected, the moving speed of the new filament is forcibly reduced, causing relative rotation between the transmission disc 12 and the drive wheel 6. The torsion spring 13 is twisted. At this time, the speed of the output shaft of the motor 7 (i.e., the speed of the transmission disc 12) does not match the speed of the filament sensed by the mileage wheel 4. At this time, the control terminal can determine that the ends of the new and old filaments are connected and control the speed of the output shaft of the motor 7 to be reduced to match the moving speed of the old filament.

[0039] In addition, by utilizing the torsional force storage of the torsion spring 13, when changing the printing speed, if the time required for the control signal to be transmitted to the transmission module is shorter than the time required for the signal to be transmitted to the motor 7, the filament between the transmission module and the motor 7 will be stretched. At this time, the torque continued by the torsion spring 13 drives the transmission disk 12 and the power wheel 6 to rotate relative to each other, which can counteract the stretching of the filament. If this is during the process of connecting the old and new filaments, the mutual squeezing force between the ends of the old and new filaments can be maintained to ensure the docking state of the ends of the old and new filaments.

[0040] Example 3 is an optimization based on Example 2.

[0041] See Figure 2 and Figures 6 to 8 The main body 1 is fixedly connected to a fixed sleeve 14, which communicates with the confluence groove of the Y-shaped groove 101. A movable sleeve 15 is fitted and slidably connected to the outside of the fixed sleeve 14. A sensor 16 is installed on the movable sleeve 15. The sensor 16 can be a photoelectric sensor module. The front parts of both the fixed sleeve 14 and the movable sleeve 15 are made of transparent plastic, so that the sensor 16 can identify the filament through the fixed sleeve 14 and the movable sleeve 15 and send a signal when the end of the filament passes the sensor 16. A mounting cylinder 17 is fixedly connected to the front end of the movable sleeve 15. The mounting cylinder 17 slides back and forth within the main body 1. A spring 18 is fixedly connected between the front side of the mounting cylinder 17 and the main body 1. The elastic coefficient of the torsion spring 13 is less than that of the spring 18. A bulletproof cylinder is fixedly connected inside the mounting cylinder 17. 19. The blast-stopping cylinder 20 and the electric heating ring 21 are arranged in sequence from back to front. The blast-stopping cylinder 19 is used to block the movement of new filament, the blast-stopping cylinder 20 is used to fix the end of the old filament, and the electric heating ring 21 is used to heat the old filament. Both the blast-stopping cylinder 19 and the blast-stopping cylinder 20 contain fluids with high thermal expansion coefficients. Both the blast-stopping cylinder 19 and the blast-stopping cylinder 20 contain heating modules 22. The heating modules 22 heat the fluids in the blast-stopping cylinder 19 and the blast-stopping cylinder 20, causing the blast-stopping cylinder 19 and the blast-stopping cylinder 20 to expand and deform inward, thereby reducing the inner diameter of the blast-stopping cylinder 19 and the blast-stopping cylinder 20. A sliding cylinder 23 is fixedly connected to the front side of the mounting cylinder 17. The sliding cylinder 23 is slidably connected to the guide tube 3.

[0042] The above setup enables the heating of the end of the old filament by the electric heating ring 21, melting the end of the old filament and allowing it to connect and adhere with the end of the new filament. This reduces the probability of gaps appearing at the connection point between the old and new filaments during movement, allowing the old and new filaments to continuously enter the print head without interruption, thus ensuring printing continuity and print quality.

[0043] See Figure 7 and Figure 8Both the bulletproof tube 19 and the fixed tube 20 are coated with a heat-insulating coating. The bulletproof tube 19 and the fixed tube 20 are used to insulate heat and prevent the heat generated by the heating module 22 from being transferred to the filament. The fixed tube 20 is used to wrap the old filament so that the heat generated by the electric heating ring 21 can only act on the end of the old filament. This shortens the length of the welding position between the new and old filaments. When changing to different colored filaments, the color switching in the print head can be more natural and crisp.

[0044] See Figure 7 and Figure 8 The inner side of the fixed tube 20 is fixed with a ring of evenly distributed guide strips 24. The rear end of the guide strip 24 is provided with an inclined part. In the direction from front to back, the distance between the inclined part of the guide strip 24 and the central axis of the mounting tube 17 gradually increases. All the guide strips 24 together wrap the new and old wires, making the ends of the new and old wires coaxial, thereby reducing the probability of end misalignment when the new and old wires are joined, and making the weld of the new and old wires smoother.

[0045] When switching between old and new filaments, when the junction of the old and new filaments passes the sensor 16, the sensor 16 sends a signal to the control terminal. The control terminal controls the heating module 22 inside the bomb-stopping cylinder 19 to start according to the moving speed of the old filament at this time, so that the fluid inside the bomb-stopping cylinder 19 expands and the inner diameter of the bomb-stopping cylinder 19 decreases. When the end of the new filament is coplanar with the front side of the bomb-stopping cylinder 19, the bomb-stopping cylinder 19 wraps and fixes the end of the new filament. At this time, the new filament cannot move, and the transmission disc 12 and the power wheel 6 rotate relative to each other and twist the torsion spring 13. When the end of the old filament is coplanar with the rear side of the fixed bomb-stopping cylinder 20, the fixed bomb-stopping cylinder 20 squeezes and fixes the old filament. After that, when the old filament moves under the drive of the transmission module, it will drive the fixed bomb-stopping cylinder 20, the mounting cylinder 17, the sliding cylinder 23, and the moving sleeve 15 to move together and compress the spring 18, while the new filament moves together with the mounting cylinder 17.

[0046] After the old wire end is fixed in the fixed cartridge 20, the electric heating ring 21 is activated and heats the ends of the old and new wires, melting them. Then, the heating module 22 in the ballistic cylinder 19 is stopped, increasing the inner diameter of the ballistic cylinder 19 and releasing the fixation on the new wire. At this time, the new wire moves rapidly towards the old wire under the action of the torsion spring 13 and enters the annularly distributed guide strips 24 through the inclined part of the guide strip 24 until the ends of the old and new wires re-contact each other. At this time, the ends of the old and new wires are fused and fixed. The control terminal stops the heating module 22 in the fixed cartridge 20, increasing the inner diameter of the fixed cartridge 20 and releasing the fixation on the old wire. After that, the old and new wires move together along the sliding cylinder 23 and the guide tube 3. The mounting cylinder 17, the moving sleeve 15, and the sliding cylinder 23 move backward and reset under the action of the spring 18.

[0047] Example 4 is an optimization based on Example 3.

[0048] See Figure 2 , Figure 4 and Figure 6 The main body 1 is fixedly connected with a guide spring 25. The guide spring 25 is located at the connection between two storage grooves and a confluence groove on the Y-shaped groove 101. Initially, the front end of the guide spring 25 is located inside the rear part of the fixed sleeve 14. The guide spring 25 is used to guide the wire in the storage groove to move into the confluence groove, and guide the new and old wire to transition from the storage groove of the guide slope 102 to the confluence groove.

[0049] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A filament feeding mechanism for a 3D printer used in the production of marine vessel hulls, characterized in that, include: The main body (1) has a Y-shaped groove (101) inside. The main body (1) is detachably connected to a cover plate (2) and fixed to a guide tube (3). The Y-shaped groove (101) and the guide tube (3) are both used to provide a path for the movement of the filament. Two symmetrically distributed mileage wheels (4) are installed on the main body (1) near the Y-shaped groove (101). The mileage wheels (4) are used to rotate with the movement of the corresponding filament and sense the speed of the filament. The main body (1) is rotatably connected to a swing frame (5). The swing frame (5) is rotatably connected to a power wheel (6) and a motor (7) is installed. The motor (7) is used to provide power to the power wheel (6). The power wheel (6) and any one of the mileage wheels (4) jointly clamp the filament. The main body (1) is provided with a power component for changing the position of the swing frame (5). The power assembly includes: A bidirectional electromagnetic push rod (8) is installed on the main body (1). The telescopic end of the bidirectional electromagnetic push rod (8) is fixed with an arc-shaped frame (9). A first sliding groove (501) is provided on the swing frame (5). The arc-shaped frame (9) passes through the main body (1) and slides within the first sliding groove (501). The main body (1) is slidably connected to an installation rod (10). The swing frame (5) is provided with a second sliding groove (502) near the installation rod (10). The installation rod (10) slides within the second sliding groove (502). Both ends of the installation rod (10) are fixedly connected to a cutter (11). The cutter (11) is used to cut the wire. The Y-shaped groove (101) consists of two symmetrically distributed storage grooves and a confluence groove, and the two cutters (11) are located between the two storage grooves; The Y-shaped groove (101) has a guide slope (102) near the confluence groove. The main body (1) has a storage groove (103) that is connected to both storage grooves on the Y-shaped groove (101). The guide slope (102) is used to move the broken wire end into the storage groove (103).

2. The filament feeding mechanism for a 3D printer used in the production of marine vessel hulls according to claim 1, characterized in that, The output shaft of the motor (7) is fixedly connected to a transmission disc (12), and a torsion spring (13) is fixedly connected between the transmission disc (12) and the power wheel (6).

3. The filament feeding mechanism for a 3D printer used in the production of marine vessel hulls according to claim 1, characterized in that, The main body (1) is fixedly connected to a fixed sleeve (14), which communicates with the confluence groove of the Y-shaped groove (101). The fixed sleeve (14) is slidably connected to a movable sleeve (15), which is equipped with a sensor (16). An installation cylinder (17) is fixedly connected to one end of the movable sleeve (15) away from the fixed sleeve (14). The installation cylinder (17) slides within the main body (1) and a spring (18) is fixedly connected between the side of the installation cylinder (17) away from the fixed sleeve (14) and the main body (1). A bulletproof cylinder (19), a bulletproof cylinder (20), and an electric heating element are fixedly connected inside the installation cylinder (17). Ring (21), the electric heating ring (21) is located between the bulletproof cylinder (19) and the fixed bulletproof cylinder (20). The bulletproof cylinder (19) is used to block the movement of new wire. The fixed bulletproof cylinder (20) is used to fix the end of the old wire. The electric heating ring (21) is used to heat the old wire. Both the bulletproof cylinder (19) and the fixed bulletproof cylinder (20) contain fluids with high thermal expansion coefficients. Both the bulletproof cylinder (19) and the fixed bulletproof cylinder (20) contain heating modules (22). The mounting cylinder (17) is fixedly connected to a sliding cylinder (23) on the side away from the fixed sleeve (14). The sliding cylinder (23) is slidably connected to the conduit (3).

4. A filament feeding mechanism for a 3D printer used in the production of marine vessel hulls according to claim 3, characterized in that, Both the bulletproof tube (19) and the solid bullet tube (20) are coated with a heat-insulating coating.

5. A filament feeding mechanism for a 3D printer used in the production of marine vessel hulls according to claim 3, characterized in that, The inner side of the fixed tube (20) is fixed with a ring of evenly distributed guide strips (24), and all of the guide strips (24) are used together to guide the connection of the new and old wire materials.

6. A filament feeding mechanism for a 3D printer used in the production of marine vessel hulls according to claim 3, characterized in that, The main body (1) is fixedly connected with a guide spring (25). The guide spring (25) is located at the connection between two storage grooves and a confluence groove on the Y-shaped groove (101). The guide spring (25) is used to guide the wire in the storage groove to move into the confluence groove.

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